xfs_bmap.c 195.9 KB
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/*
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 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
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 * All Rights Reserved.
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 *
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 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
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 * published by the Free Software Foundation.
 *
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 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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 */
#include "xfs.h"
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#include "xfs_fs.h"
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#include "xfs_types.h"
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#include "xfs_bit.h"
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#include "xfs_log.h"
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#include "xfs_inum.h"
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#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_dir2.h"
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#include "xfs_da_btree.h"
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#include "xfs_bmap_btree.h"
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#include "xfs_alloc_btree.h"
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#include "xfs_ialloc_btree.h"
#include "xfs_dir2_sf.h"
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#include "xfs_attr_sf.h"
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#include "xfs_dinode.h"
#include "xfs_inode.h"
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#include "xfs_btree.h"
#include "xfs_dmapi.h"
#include "xfs_mount.h"
#include "xfs_ialloc.h"
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#include "xfs_itable.h"
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#include "xfs_dir2_data.h"
#include "xfs_dir2_leaf.h"
#include "xfs_dir2_block.h"
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#include "xfs_inode_item.h"
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#include "xfs_extfree_item.h"
#include "xfs_alloc.h"
#include "xfs_bmap.h"
#include "xfs_rtalloc.h"
#include "xfs_error.h"
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#include "xfs_attr_leaf.h"
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#include "xfs_rw.h"
#include "xfs_quota.h"
#include "xfs_trans_space.h"
#include "xfs_buf_item.h"
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#include "xfs_filestream.h"
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#ifdef DEBUG
STATIC void
xfs_bmap_check_leaf_extents(xfs_btree_cur_t *cur, xfs_inode_t *ip, int whichfork);
#endif

kmem_zone_t		*xfs_bmap_free_item_zone;

/*
 * Prototypes for internal bmap routines.
 */


/*
 * Called from xfs_bmap_add_attrfork to handle extents format files.
 */
STATIC int					/* error */
xfs_bmap_add_attrfork_extents(
	xfs_trans_t		*tp,		/* transaction pointer */
	xfs_inode_t		*ip,		/* incore inode pointer */
	xfs_fsblock_t		*firstblock,	/* first block allocated */
	xfs_bmap_free_t		*flist,		/* blocks to free at commit */
	int			*flags);	/* inode logging flags */

/*
 * Called from xfs_bmap_add_attrfork to handle local format files.
 */
STATIC int					/* error */
xfs_bmap_add_attrfork_local(
	xfs_trans_t		*tp,		/* transaction pointer */
	xfs_inode_t		*ip,		/* incore inode pointer */
	xfs_fsblock_t		*firstblock,	/* first block allocated */
	xfs_bmap_free_t		*flist,		/* blocks to free at commit */
	int			*flags);	/* inode logging flags */

/*
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 * Called by xfs_bmapi to update file extent records and the btree
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 * after allocating space (or doing a delayed allocation).
 */
STATIC int				/* error */
xfs_bmap_add_extent(
	xfs_inode_t		*ip,	/* incore inode pointer */
	xfs_extnum_t		idx,	/* extent number to update/insert */
	xfs_btree_cur_t		**curp,	/* if *curp is null, not a btree */
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	xfs_bmbt_irec_t		*new,	/* new data to add to file extents */
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	xfs_fsblock_t		*first,	/* pointer to firstblock variable */
	xfs_bmap_free_t		*flist,	/* list of extents to be freed */
	int			*logflagsp, /* inode logging flags */
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	xfs_extdelta_t		*delta, /* Change made to incore extents */
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	int			whichfork, /* data or attr fork */
	int			rsvd);	/* OK to allocate reserved blocks */

/*
 * Called by xfs_bmap_add_extent to handle cases converting a delayed
 * allocation to a real allocation.
 */
STATIC int				/* error */
xfs_bmap_add_extent_delay_real(
	xfs_inode_t		*ip,	/* incore inode pointer */
	xfs_extnum_t		idx,	/* extent number to update/insert */
	xfs_btree_cur_t		**curp,	/* if *curp is null, not a btree */
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	xfs_bmbt_irec_t		*new,	/* new data to add to file extents */
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	xfs_filblks_t		*dnew,	/* new delayed-alloc indirect blocks */
	xfs_fsblock_t		*first,	/* pointer to firstblock variable */
	xfs_bmap_free_t		*flist,	/* list of extents to be freed */
	int			*logflagsp, /* inode logging flags */
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	xfs_extdelta_t		*delta, /* Change made to incore extents */
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	int			rsvd);	/* OK to allocate reserved blocks */

/*
 * Called by xfs_bmap_add_extent to handle cases converting a hole
 * to a delayed allocation.
 */
STATIC int				/* error */
xfs_bmap_add_extent_hole_delay(
	xfs_inode_t		*ip,	/* incore inode pointer */
	xfs_extnum_t		idx,	/* extent number to update/insert */
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	xfs_bmbt_irec_t		*new,	/* new data to add to file extents */
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	int			*logflagsp,/* inode logging flags */
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	xfs_extdelta_t		*delta, /* Change made to incore extents */
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	int			rsvd);	/* OK to allocate reserved blocks */

/*
 * Called by xfs_bmap_add_extent to handle cases converting a hole
 * to a real allocation.
 */
STATIC int				/* error */
xfs_bmap_add_extent_hole_real(
	xfs_inode_t		*ip,	/* incore inode pointer */
	xfs_extnum_t		idx,	/* extent number to update/insert */
	xfs_btree_cur_t		*cur,	/* if null, not a btree */
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	xfs_bmbt_irec_t		*new,	/* new data to add to file extents */
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	int			*logflagsp, /* inode logging flags */
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	xfs_extdelta_t		*delta, /* Change made to incore extents */
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	int			whichfork); /* data or attr fork */

/*
 * Called by xfs_bmap_add_extent to handle cases converting an unwritten
 * allocation to a real allocation or vice versa.
 */
STATIC int				/* error */
xfs_bmap_add_extent_unwritten_real(
	xfs_inode_t		*ip,	/* incore inode pointer */
	xfs_extnum_t		idx,	/* extent number to update/insert */
	xfs_btree_cur_t		**curp,	/* if *curp is null, not a btree */
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	xfs_bmbt_irec_t		*new,	/* new data to add to file extents */
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	int			*logflagsp, /* inode logging flags */
	xfs_extdelta_t		*delta); /* Change made to incore extents */
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/*
 * xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file.
 * It figures out where to ask the underlying allocator to put the new extent.
 */
STATIC int				/* error */
xfs_bmap_alloc(
	xfs_bmalloca_t		*ap);	/* bmap alloc argument struct */

/*
 * Transform a btree format file with only one leaf node, where the
 * extents list will fit in the inode, into an extents format file.
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 * Since the file extents are already in-core, all we have to do is
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 * give up the space for the btree root and pitch the leaf block.
 */
STATIC int				/* error */
xfs_bmap_btree_to_extents(
	xfs_trans_t		*tp,	/* transaction pointer */
	xfs_inode_t		*ip,	/* incore inode pointer */
	xfs_btree_cur_t		*cur,	/* btree cursor */
	int			*logflagsp, /* inode logging flags */
	int			whichfork); /* data or attr fork */

/*
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 * Called by xfs_bmapi to update file extent records and the btree
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 * after removing space (or undoing a delayed allocation).
 */
STATIC int				/* error */
xfs_bmap_del_extent(
	xfs_inode_t		*ip,	/* incore inode pointer */
	xfs_trans_t		*tp,	/* current trans pointer */
	xfs_extnum_t		idx,	/* extent number to update/insert */
	xfs_bmap_free_t		*flist,	/* list of extents to be freed */
	xfs_btree_cur_t		*cur,	/* if null, not a btree */
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	xfs_bmbt_irec_t		*new,	/* new data to add to file extents */
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	int			*logflagsp,/* inode logging flags */
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	xfs_extdelta_t		*delta, /* Change made to incore extents */
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	int			whichfork, /* data or attr fork */
	int			rsvd);	 /* OK to allocate reserved blocks */

/*
 * Remove the entry "free" from the free item list.  Prev points to the
 * previous entry, unless "free" is the head of the list.
 */
STATIC void
xfs_bmap_del_free(
	xfs_bmap_free_t		*flist,	/* free item list header */
	xfs_bmap_free_item_t	*prev,	/* previous item on list, if any */
	xfs_bmap_free_item_t	*free);	/* list item to be freed */

/*
 * Convert an extents-format file into a btree-format file.
 * The new file will have a root block (in the inode) and a single child block.
 */
STATIC int					/* error */
xfs_bmap_extents_to_btree(
	xfs_trans_t		*tp,		/* transaction pointer */
	xfs_inode_t		*ip,		/* incore inode pointer */
	xfs_fsblock_t		*firstblock,	/* first-block-allocated */
	xfs_bmap_free_t		*flist,		/* blocks freed in xaction */
	xfs_btree_cur_t		**curp,		/* cursor returned to caller */
	int			wasdel,		/* converting a delayed alloc */
	int			*logflagsp,	/* inode logging flags */
	int			whichfork);	/* data or attr fork */

/*
 * Convert a local file to an extents file.
 * This code is sort of bogus, since the file data needs to get
 * logged so it won't be lost.  The bmap-level manipulations are ok, though.
 */
STATIC int				/* error */
xfs_bmap_local_to_extents(
	xfs_trans_t	*tp,		/* transaction pointer */
	xfs_inode_t	*ip,		/* incore inode pointer */
	xfs_fsblock_t	*firstblock,	/* first block allocated in xaction */
	xfs_extlen_t	total,		/* total blocks needed by transaction */
	int		*logflagsp,	/* inode logging flags */
	int		whichfork);	/* data or attr fork */

/*
 * Search the extents list for the inode, for the extent containing bno.
 * If bno lies in a hole, point to the next entry.  If bno lies past eof,
 * *eofp will be set, and *prevp will contain the last entry (null if none).
 * Else, *lastxp will be set to the index of the found
 * entry; *gotp will contain the entry.
 */
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STATIC xfs_bmbt_rec_host_t *		/* pointer to found extent entry */
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xfs_bmap_search_extents(
	xfs_inode_t	*ip,		/* incore inode pointer */
	xfs_fileoff_t	bno,		/* block number searched for */
	int		whichfork,	/* data or attr fork */
	int		*eofp,		/* out: end of file found */
	xfs_extnum_t	*lastxp,	/* out: last extent index */
	xfs_bmbt_irec_t	*gotp,		/* out: extent entry found */
	xfs_bmbt_irec_t	*prevp);	/* out: previous extent entry found */

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/*
 * Check the last inode extent to determine whether this allocation will result
 * in blocks being allocated at the end of the file. When we allocate new data
 * blocks at the end of the file which do not start at the previous data block,
 * we will try to align the new blocks at stripe unit boundaries.
 */
STATIC int				/* error */
xfs_bmap_isaeof(
	xfs_inode_t	*ip,		/* incore inode pointer */
	xfs_fileoff_t   off,		/* file offset in fsblocks */
	int             whichfork,	/* data or attribute fork */
	char		*aeof);		/* return value */

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#ifdef XFS_BMAP_TRACE
/*
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 * Add bmap trace entry prior to a call to xfs_iext_remove.
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 */
STATIC void
xfs_bmap_trace_delete(
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	const char	*fname,		/* function name */
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	char		*desc,		/* operation description */
	xfs_inode_t	*ip,		/* incore inode pointer */
	xfs_extnum_t	idx,		/* index of entry(entries) deleted */
	xfs_extnum_t	cnt,		/* count of entries deleted, 1 or 2 */
	int		whichfork);	/* data or attr fork */

/*
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 * Add bmap trace entry prior to a call to xfs_iext_insert, or
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 * reading in the extents list from the disk (in the btree).
 */
STATIC void
xfs_bmap_trace_insert(
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	const char	*fname,		/* function name */
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	char		*desc,		/* operation description */
	xfs_inode_t	*ip,		/* incore inode pointer */
	xfs_extnum_t	idx,		/* index of entry(entries) inserted */
	xfs_extnum_t	cnt,		/* count of entries inserted, 1 or 2 */
	xfs_bmbt_irec_t	*r1,		/* inserted record 1 */
	xfs_bmbt_irec_t	*r2,		/* inserted record 2 or null */
	int		whichfork);	/* data or attr fork */

/*
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 * Add bmap trace entry after updating an extent record in place.
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 */
STATIC void
xfs_bmap_trace_post_update(
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	const char	*fname,		/* function name */
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	char		*desc,		/* operation description */
	xfs_inode_t	*ip,		/* incore inode pointer */
	xfs_extnum_t	idx,		/* index of entry updated */
	int		whichfork);	/* data or attr fork */

/*
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 * Add bmap trace entry prior to updating an extent record in place.
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 */
STATIC void
xfs_bmap_trace_pre_update(
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	const char	*fname,		/* function name */
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	char		*desc,		/* operation description */
	xfs_inode_t	*ip,		/* incore inode pointer */
	xfs_extnum_t	idx,		/* index of entry to be updated */
	int		whichfork);	/* data or attr fork */

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#define	XFS_BMAP_TRACE_DELETE(d,ip,i,c,w)	\
	xfs_bmap_trace_delete(__FUNCTION__,d,ip,i,c,w)
#define	XFS_BMAP_TRACE_INSERT(d,ip,i,c,r1,r2,w)	\
	xfs_bmap_trace_insert(__FUNCTION__,d,ip,i,c,r1,r2,w)
#define	XFS_BMAP_TRACE_POST_UPDATE(d,ip,i,w)	\
	xfs_bmap_trace_post_update(__FUNCTION__,d,ip,i,w)
#define	XFS_BMAP_TRACE_PRE_UPDATE(d,ip,i,w)	\
	xfs_bmap_trace_pre_update(__FUNCTION__,d,ip,i,w)
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#else
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#define	XFS_BMAP_TRACE_DELETE(d,ip,i,c,w)
#define	XFS_BMAP_TRACE_INSERT(d,ip,i,c,r1,r2,w)
#define	XFS_BMAP_TRACE_POST_UPDATE(d,ip,i,w)
#define	XFS_BMAP_TRACE_PRE_UPDATE(d,ip,i,w)
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#endif	/* XFS_BMAP_TRACE */

/*
 * Compute the worst-case number of indirect blocks that will be used
 * for ip's delayed extent of length "len".
 */
STATIC xfs_filblks_t
xfs_bmap_worst_indlen(
	xfs_inode_t		*ip,	/* incore inode pointer */
	xfs_filblks_t		len);	/* delayed extent length */

#ifdef DEBUG
/*
 * Perform various validation checks on the values being returned
 * from xfs_bmapi().
 */
STATIC void
xfs_bmap_validate_ret(
	xfs_fileoff_t		bno,
	xfs_filblks_t		len,
	int			flags,
	xfs_bmbt_irec_t		*mval,
	int			nmap,
	int			ret_nmap);
#else
#define	xfs_bmap_validate_ret(bno,len,flags,mval,onmap,nmap)
#endif /* DEBUG */

#if defined(XFS_RW_TRACE)
STATIC void
xfs_bunmap_trace(
	xfs_inode_t		*ip,
	xfs_fileoff_t		bno,
	xfs_filblks_t		len,
	int			flags,
	inst_t			*ra);
#else
#define	xfs_bunmap_trace(ip, bno, len, flags, ra)
#endif	/* XFS_RW_TRACE */

STATIC int
xfs_bmap_count_tree(
	xfs_mount_t     *mp,
	xfs_trans_t     *tp,
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	xfs_ifork_t	*ifp,
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	xfs_fsblock_t   blockno,
	int             levelin,
	int		*count);

STATIC int
xfs_bmap_count_leaves(
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	xfs_ifork_t		*ifp,
	xfs_extnum_t		idx,
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	int			numrecs,
	int			*count);

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STATIC int
xfs_bmap_disk_count_leaves(
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	xfs_extnum_t		idx,
	xfs_bmbt_block_t	*block,
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	int			numrecs,
	int			*count);

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/*
 * Bmap internal routines.
 */

/*
 * Called from xfs_bmap_add_attrfork to handle btree format files.
 */
STATIC int					/* error */
xfs_bmap_add_attrfork_btree(
	xfs_trans_t		*tp,		/* transaction pointer */
	xfs_inode_t		*ip,		/* incore inode pointer */
	xfs_fsblock_t		*firstblock,	/* first block allocated */
	xfs_bmap_free_t		*flist,		/* blocks to free at commit */
	int			*flags)		/* inode logging flags */
{
	xfs_btree_cur_t		*cur;		/* btree cursor */
	int			error;		/* error return value */
	xfs_mount_t		*mp;		/* file system mount struct */
	int			stat;		/* newroot status */

	mp = ip->i_mount;
	if (ip->i_df.if_broot_bytes <= XFS_IFORK_DSIZE(ip))
		*flags |= XFS_ILOG_DBROOT;
	else {
		cur = xfs_btree_init_cursor(mp, tp, NULL, 0, XFS_BTNUM_BMAP, ip,
			XFS_DATA_FORK);
		cur->bc_private.b.flist = flist;
		cur->bc_private.b.firstblock = *firstblock;
		if ((error = xfs_bmbt_lookup_ge(cur, 0, 0, 0, &stat)))
			goto error0;
		ASSERT(stat == 1);	/* must be at least one entry */
		if ((error = xfs_bmbt_newroot(cur, flags, &stat)))
			goto error0;
		if (stat == 0) {
			xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
			return XFS_ERROR(ENOSPC);
		}
		*firstblock = cur->bc_private.b.firstblock;
		cur->bc_private.b.allocated = 0;
		xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
	}
	return 0;
error0:
	xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
	return error;
}

/*
 * Called from xfs_bmap_add_attrfork to handle extents format files.
 */
STATIC int					/* error */
xfs_bmap_add_attrfork_extents(
	xfs_trans_t		*tp,		/* transaction pointer */
	xfs_inode_t		*ip,		/* incore inode pointer */
	xfs_fsblock_t		*firstblock,	/* first block allocated */
	xfs_bmap_free_t		*flist,		/* blocks to free at commit */
	int			*flags)		/* inode logging flags */
{
	xfs_btree_cur_t		*cur;		/* bmap btree cursor */
	int			error;		/* error return value */

	if (ip->i_d.di_nextents * sizeof(xfs_bmbt_rec_t) <= XFS_IFORK_DSIZE(ip))
		return 0;
	cur = NULL;
	error = xfs_bmap_extents_to_btree(tp, ip, firstblock, flist, &cur, 0,
		flags, XFS_DATA_FORK);
	if (cur) {
		cur->bc_private.b.allocated = 0;
		xfs_btree_del_cursor(cur,
			error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
	}
	return error;
}

/*
 * Called from xfs_bmap_add_attrfork to handle local format files.
 */
STATIC int					/* error */
xfs_bmap_add_attrfork_local(
	xfs_trans_t		*tp,		/* transaction pointer */
	xfs_inode_t		*ip,		/* incore inode pointer */
	xfs_fsblock_t		*firstblock,	/* first block allocated */
	xfs_bmap_free_t		*flist,		/* blocks to free at commit */
	int			*flags)		/* inode logging flags */
{
	xfs_da_args_t		dargs;		/* args for dir/attr code */
	int			error;		/* error return value */
	xfs_mount_t		*mp;		/* mount structure pointer */

	if (ip->i_df.if_bytes <= XFS_IFORK_DSIZE(ip))
		return 0;
	if ((ip->i_d.di_mode & S_IFMT) == S_IFDIR) {
		mp = ip->i_mount;
		memset(&dargs, 0, sizeof(dargs));
		dargs.dp = ip;
		dargs.firstblock = firstblock;
		dargs.flist = flist;
		dargs.total = mp->m_dirblkfsbs;
		dargs.whichfork = XFS_DATA_FORK;
		dargs.trans = tp;
500
		error = xfs_dir2_sf_to_block(&dargs);
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	} else
		error = xfs_bmap_local_to_extents(tp, ip, firstblock, 1, flags,
			XFS_DATA_FORK);
	return error;
}

/*
508
 * Called by xfs_bmapi to update file extent records and the btree
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 * after allocating space (or doing a delayed allocation).
 */
STATIC int				/* error */
xfs_bmap_add_extent(
	xfs_inode_t		*ip,	/* incore inode pointer */
	xfs_extnum_t		idx,	/* extent number to update/insert */
	xfs_btree_cur_t		**curp,	/* if *curp is null, not a btree */
516
	xfs_bmbt_irec_t		*new,	/* new data to add to file extents */
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	xfs_fsblock_t		*first,	/* pointer to firstblock variable */
	xfs_bmap_free_t		*flist,	/* list of extents to be freed */
	int			*logflagsp, /* inode logging flags */
520
	xfs_extdelta_t		*delta, /* Change made to incore extents */
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	int			whichfork, /* data or attr fork */
	int			rsvd)	/* OK to use reserved data blocks */
{
	xfs_btree_cur_t		*cur;	/* btree cursor or null */
	xfs_filblks_t		da_new; /* new count del alloc blocks used */
	xfs_filblks_t		da_old; /* old count del alloc blocks used */
	int			error;	/* error return value */
	xfs_ifork_t		*ifp;	/* inode fork ptr */
	int			logflags; /* returned value */
	xfs_extnum_t		nextents; /* number of extents in file now */

	XFS_STATS_INC(xs_add_exlist);
	cur = *curp;
	ifp = XFS_IFORK_PTR(ip, whichfork);
	nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
	ASSERT(idx <= nextents);
	da_old = da_new = 0;
	error = 0;
	/*
	 * This is the first extent added to a new/empty file.
	 * Special case this one, so other routines get to assume there are
	 * already extents in the list.
	 */
	if (nextents == 0) {
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		XFS_BMAP_TRACE_INSERT("insert empty", ip, 0, 1, new, NULL,
			whichfork);
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		xfs_iext_insert(ifp, 0, 1, new);
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		ASSERT(cur == NULL);
		ifp->if_lastex = 0;
		if (!ISNULLSTARTBLOCK(new->br_startblock)) {
			XFS_IFORK_NEXT_SET(ip, whichfork, 1);
			logflags = XFS_ILOG_CORE | XFS_ILOG_FEXT(whichfork);
		} else
			logflags = 0;
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		/* DELTA: single new extent */
		if (delta) {
			if (delta->xed_startoff > new->br_startoff)
				delta->xed_startoff = new->br_startoff;
			if (delta->xed_blockcount <
					new->br_startoff + new->br_blockcount)
				delta->xed_blockcount = new->br_startoff +
						new->br_blockcount;
		}
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	}
	/*
	 * Any kind of new delayed allocation goes here.
	 */
	else if (ISNULLSTARTBLOCK(new->br_startblock)) {
		if (cur)
			ASSERT((cur->bc_private.b.flags &
				XFS_BTCUR_BPRV_WASDEL) == 0);
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		if ((error = xfs_bmap_add_extent_hole_delay(ip, idx, new,
573
				&logflags, delta, rsvd)))
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			goto done;
	}
	/*
	 * Real allocation off the end of the file.
	 */
	else if (idx == nextents) {
		if (cur)
			ASSERT((cur->bc_private.b.flags &
				XFS_BTCUR_BPRV_WASDEL) == 0);
		if ((error = xfs_bmap_add_extent_hole_real(ip, idx, cur, new,
584
				&logflags, delta, whichfork)))
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			goto done;
	} else {
		xfs_bmbt_irec_t	prev;	/* old extent at offset idx */

		/*
		 * Get the record referred to by idx.
		 */
592
		xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx), &prev);
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		/*
		 * If it's a real allocation record, and the new allocation ends
		 * after the start of the referred to record, then we're filling
		 * in a delayed or unwritten allocation with a real one, or
		 * converting real back to unwritten.
		 */
		if (!ISNULLSTARTBLOCK(new->br_startblock) &&
		    new->br_startoff + new->br_blockcount > prev.br_startoff) {
			if (prev.br_state != XFS_EXT_UNWRITTEN &&
			    ISNULLSTARTBLOCK(prev.br_startblock)) {
				da_old = STARTBLOCKVAL(prev.br_startblock);
				if (cur)
					ASSERT(cur->bc_private.b.flags &
						XFS_BTCUR_BPRV_WASDEL);
				if ((error = xfs_bmap_add_extent_delay_real(ip,
					idx, &cur, new, &da_new, first, flist,
609
					&logflags, delta, rsvd)))
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					goto done;
			} else if (new->br_state == XFS_EXT_NORM) {
				ASSERT(new->br_state == XFS_EXT_NORM);
				if ((error = xfs_bmap_add_extent_unwritten_real(
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					ip, idx, &cur, new, &logflags, delta)))
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					goto done;
			} else {
				ASSERT(new->br_state == XFS_EXT_UNWRITTEN);
				if ((error = xfs_bmap_add_extent_unwritten_real(
619
					ip, idx, &cur, new, &logflags, delta)))
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					goto done;
			}
			ASSERT(*curp == cur || *curp == NULL);
		}
		/*
		 * Otherwise we're filling in a hole with an allocation.
		 */
		else {
			if (cur)
				ASSERT((cur->bc_private.b.flags &
					XFS_BTCUR_BPRV_WASDEL) == 0);
			if ((error = xfs_bmap_add_extent_hole_real(ip, idx, cur,
632
					new, &logflags, delta, whichfork)))
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				goto done;
		}
	}

	ASSERT(*curp == cur || *curp == NULL);
	/*
	 * Convert to a btree if necessary.
	 */
	if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
	    XFS_IFORK_NEXTENTS(ip, whichfork) > ifp->if_ext_max) {
		int	tmp_logflags;	/* partial log flag return val */

		ASSERT(cur == NULL);
		error = xfs_bmap_extents_to_btree(ip->i_transp, ip, first,
			flist, &cur, da_old > 0, &tmp_logflags, whichfork);
		logflags |= tmp_logflags;
		if (error)
			goto done;
	}
	/*
	 * Adjust for changes in reserved delayed indirect blocks.
	 * Nothing to do for disk quotas here.
	 */
	if (da_old || da_new) {
		xfs_filblks_t	nblks;

		nblks = da_new;
		if (cur)
			nblks += cur->bc_private.b.allocated;
		ASSERT(nblks <= da_old);
		if (nblks < da_old)
			xfs_mod_incore_sb(ip->i_mount, XFS_SBS_FDBLOCKS,
665
				(int64_t)(da_old - nblks), rsvd);
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	}
	/*
	 * Clear out the allocated field, done with it now in any case.
	 */
	if (cur) {
		cur->bc_private.b.allocated = 0;
		*curp = cur;
	}
done:
#ifdef DEBUG
	if (!error)
		xfs_bmap_check_leaf_extents(*curp, ip, whichfork);
#endif
	*logflagsp = logflags;
	return error;
}

/*
 * Called by xfs_bmap_add_extent to handle cases converting a delayed
 * allocation to a real allocation.
 */
STATIC int				/* error */
xfs_bmap_add_extent_delay_real(
	xfs_inode_t		*ip,	/* incore inode pointer */
	xfs_extnum_t		idx,	/* extent number to update/insert */
	xfs_btree_cur_t		**curp,	/* if *curp is null, not a btree */
692
	xfs_bmbt_irec_t		*new,	/* new data to add to file extents */
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	xfs_filblks_t		*dnew,	/* new delayed-alloc indirect blocks */
	xfs_fsblock_t		*first,	/* pointer to firstblock variable */
	xfs_bmap_free_t		*flist,	/* list of extents to be freed */
	int			*logflagsp, /* inode logging flags */
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	xfs_extdelta_t		*delta, /* Change made to incore extents */
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	int			rsvd)	/* OK to use reserved data block allocation */
{
	xfs_btree_cur_t		*cur;	/* btree cursor */
	int			diff;	/* temp value */
702
	xfs_bmbt_rec_host_t	*ep;	/* extent entry for idx */
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	int			error;	/* error return value */
	int			i;	/* temp state */
705
	xfs_ifork_t		*ifp;	/* inode fork pointer */
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	xfs_fileoff_t		new_endoff;	/* end offset of new entry */
	xfs_bmbt_irec_t		r[3];	/* neighbor extent entries */
					/* left is 0, right is 1, prev is 2 */
	int			rval=0;	/* return value (logging flags) */
	int			state = 0;/* state bits, accessed thru macros */
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	xfs_filblks_t		temp=0;	/* value for dnew calculations */
	xfs_filblks_t		temp2=0;/* value for dnew calculations */
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	int			tmp_rval;	/* partial logging flags */
	enum {				/* bit number definitions for state */
		LEFT_CONTIG,	RIGHT_CONTIG,
		LEFT_FILLING,	RIGHT_FILLING,
		LEFT_DELAY,	RIGHT_DELAY,
		LEFT_VALID,	RIGHT_VALID
	};

#define	LEFT		r[0]
#define	RIGHT		r[1]
#define	PREV		r[2]
#define	MASK(b)		(1 << (b))
#define	MASK2(a,b)	(MASK(a) | MASK(b))
#define	MASK3(a,b,c)	(MASK2(a,b) | MASK(c))
#define	MASK4(a,b,c,d)	(MASK3(a,b,c) | MASK(d))
#define	STATE_SET(b,v)	((v) ? (state |= MASK(b)) : (state &= ~MASK(b)))
#define	STATE_TEST(b)	(state & MASK(b))
#define	STATE_SET_TEST(b,v)	((v) ? ((state |= MASK(b)), 1) : \
				       ((state &= ~MASK(b)), 0))
#define	SWITCH_STATE		\
	(state & MASK4(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG))

	/*
	 * Set up a bunch of variables to make the tests simpler.
	 */
	cur = *curp;
739 740
	ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
	ep = xfs_iext_get_ext(ifp, idx);
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	xfs_bmbt_get_all(ep, &PREV);
	new_endoff = new->br_startoff + new->br_blockcount;
	ASSERT(PREV.br_startoff <= new->br_startoff);
	ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
	/*
	 * Set flags determining what part of the previous delayed allocation
	 * extent is being replaced by a real allocation.
	 */
	STATE_SET(LEFT_FILLING, PREV.br_startoff == new->br_startoff);
	STATE_SET(RIGHT_FILLING,
		PREV.br_startoff + PREV.br_blockcount == new_endoff);
	/*
	 * Check and set flags if this segment has a left neighbor.
	 * Don't set contiguous if the combined extent would be too large.
	 */
	if (STATE_SET_TEST(LEFT_VALID, idx > 0)) {
757
		xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx - 1), &LEFT);
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		STATE_SET(LEFT_DELAY, ISNULLSTARTBLOCK(LEFT.br_startblock));
	}
	STATE_SET(LEFT_CONTIG,
		STATE_TEST(LEFT_VALID) && !STATE_TEST(LEFT_DELAY) &&
		LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
		LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
		LEFT.br_state == new->br_state &&
		LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN);
	/*
	 * Check and set flags if this segment has a right neighbor.
	 * Don't set contiguous if the combined extent would be too large.
	 * Also check for all-three-contiguous being too large.
	 */
	if (STATE_SET_TEST(RIGHT_VALID,
			idx <
			ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1)) {
774
		xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx + 1), &RIGHT);
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		STATE_SET(RIGHT_DELAY, ISNULLSTARTBLOCK(RIGHT.br_startblock));
	}
	STATE_SET(RIGHT_CONTIG,
		STATE_TEST(RIGHT_VALID) && !STATE_TEST(RIGHT_DELAY) &&
		new_endoff == RIGHT.br_startoff &&
		new->br_startblock + new->br_blockcount ==
		    RIGHT.br_startblock &&
		new->br_state == RIGHT.br_state &&
		new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
		((state & MASK3(LEFT_CONTIG, LEFT_FILLING, RIGHT_FILLING)) !=
		  MASK3(LEFT_CONTIG, LEFT_FILLING, RIGHT_FILLING) ||
		 LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
		     <= MAXEXTLEN));
	error = 0;
	/*
	 * Switch out based on the FILLING and CONTIG state bits.
	 */
	switch (SWITCH_STATE) {

	case MASK4(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
		/*
		 * Filling in all of a previously delayed allocation extent.
		 * The left and right neighbors are both contiguous with new.
		 */
799
		XFS_BMAP_TRACE_PRE_UPDATE("LF|RF|LC|RC", ip, idx - 1,
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			XFS_DATA_FORK);
801
		xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
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			LEFT.br_blockcount + PREV.br_blockcount +
			RIGHT.br_blockcount);
804
		XFS_BMAP_TRACE_POST_UPDATE("LF|RF|LC|RC", ip, idx - 1,
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			XFS_DATA_FORK);
806
		XFS_BMAP_TRACE_DELETE("LF|RF|LC|RC", ip, idx, 2, XFS_DATA_FORK);
807
		xfs_iext_remove(ifp, idx, 2);
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		ip->i_df.if_lastex = idx - 1;
		ip->i_d.di_nextents--;
		if (cur == NULL)
			rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
		else {
			rval = XFS_ILOG_CORE;
			if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
					RIGHT.br_startblock,
					RIGHT.br_blockcount, &i)))
				goto done;
			ASSERT(i == 1);
			if ((error = xfs_bmbt_delete(cur, &i)))
				goto done;
			ASSERT(i == 1);
			if ((error = xfs_bmbt_decrement(cur, 0, &i)))
				goto done;
			ASSERT(i == 1);
			if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
					LEFT.br_startblock,
					LEFT.br_blockcount +
					PREV.br_blockcount +
					RIGHT.br_blockcount, LEFT.br_state)))
				goto done;
		}
		*dnew = 0;
833 834 835 836 837
		/* DELTA: Three in-core extents are replaced by one. */
		temp = LEFT.br_startoff;
		temp2 = LEFT.br_blockcount +
			PREV.br_blockcount +
			RIGHT.br_blockcount;
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		break;

	case MASK3(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG):
		/*
		 * Filling in all of a previously delayed allocation extent.
		 * The left neighbor is contiguous, the right is not.
		 */
845
		XFS_BMAP_TRACE_PRE_UPDATE("LF|RF|LC", ip, idx - 1,
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			XFS_DATA_FORK);
847
		xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
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			LEFT.br_blockcount + PREV.br_blockcount);
849
		XFS_BMAP_TRACE_POST_UPDATE("LF|RF|LC", ip, idx - 1,
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			XFS_DATA_FORK);
		ip->i_df.if_lastex = idx - 1;
852
		XFS_BMAP_TRACE_DELETE("LF|RF|LC", ip, idx, 1, XFS_DATA_FORK);
853
		xfs_iext_remove(ifp, idx, 1);
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		if (cur == NULL)
			rval = XFS_ILOG_DEXT;
		else {
			rval = 0;
			if ((error = xfs_bmbt_lookup_eq(cur, LEFT.br_startoff,
					LEFT.br_startblock, LEFT.br_blockcount,
					&i)))
				goto done;
			ASSERT(i == 1);
			if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
					LEFT.br_startblock,
					LEFT.br_blockcount +
					PREV.br_blockcount, LEFT.br_state)))
				goto done;
		}
		*dnew = 0;
870 871 872 873
		/* DELTA: Two in-core extents are replaced by one. */
		temp = LEFT.br_startoff;
		temp2 = LEFT.br_blockcount +
			PREV.br_blockcount;
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		break;

	case MASK3(LEFT_FILLING, RIGHT_FILLING, RIGHT_CONTIG):
		/*
		 * Filling in all of a previously delayed allocation extent.
		 * The right neighbor is contiguous, the left is not.
		 */
881
		XFS_BMAP_TRACE_PRE_UPDATE("LF|RF|RC", ip, idx, XFS_DATA_FORK);
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		xfs_bmbt_set_startblock(ep, new->br_startblock);
		xfs_bmbt_set_blockcount(ep,
			PREV.br_blockcount + RIGHT.br_blockcount);
885
		XFS_BMAP_TRACE_POST_UPDATE("LF|RF|RC", ip, idx, XFS_DATA_FORK);
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		ip->i_df.if_lastex = idx;
887
		XFS_BMAP_TRACE_DELETE("LF|RF|RC", ip, idx + 1, 1, XFS_DATA_FORK);
888
		xfs_iext_remove(ifp, idx + 1, 1);
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		if (cur == NULL)
			rval = XFS_ILOG_DEXT;
		else {
			rval = 0;
			if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
					RIGHT.br_startblock,
					RIGHT.br_blockcount, &i)))
				goto done;
			ASSERT(i == 1);
			if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
					new->br_startblock,
					PREV.br_blockcount +
					RIGHT.br_blockcount, PREV.br_state)))
				goto done;
		}
		*dnew = 0;
905 906 907 908
		/* DELTA: Two in-core extents are replaced by one. */
		temp = PREV.br_startoff;
		temp2 = PREV.br_blockcount +
			RIGHT.br_blockcount;
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		break;

	case MASK2(LEFT_FILLING, RIGHT_FILLING):
		/*
		 * Filling in all of a previously delayed allocation extent.
		 * Neither the left nor right neighbors are contiguous with
		 * the new one.
		 */
917
		XFS_BMAP_TRACE_PRE_UPDATE("LF|RF", ip, idx, XFS_DATA_FORK);
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		xfs_bmbt_set_startblock(ep, new->br_startblock);
919
		XFS_BMAP_TRACE_POST_UPDATE("LF|RF", ip, idx, XFS_DATA_FORK);
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		ip->i_df.if_lastex = idx;
		ip->i_d.di_nextents++;
		if (cur == NULL)
			rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
		else {
			rval = XFS_ILOG_CORE;
			if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
					new->br_startblock, new->br_blockcount,
					&i)))
				goto done;
			ASSERT(i == 0);
			cur->bc_rec.b.br_state = XFS_EXT_NORM;
			if ((error = xfs_bmbt_insert(cur, &i)))
				goto done;
			ASSERT(i == 1);
		}
		*dnew = 0;
937 938 939
		/* DELTA: The in-core extent described by new changed type. */
		temp = new->br_startoff;
		temp2 = new->br_blockcount;
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		break;

	case MASK2(LEFT_FILLING, LEFT_CONTIG):
		/*
		 * Filling in the first part of a previous delayed allocation.
		 * The left neighbor is contiguous.
		 */
947
		XFS_BMAP_TRACE_PRE_UPDATE("LF|LC", ip, idx - 1, XFS_DATA_FORK);
948
		xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
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			LEFT.br_blockcount + new->br_blockcount);
		xfs_bmbt_set_startoff(ep,
			PREV.br_startoff + new->br_blockcount);
952
		XFS_BMAP_TRACE_POST_UPDATE("LF|LC", ip, idx - 1, XFS_DATA_FORK);
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		temp = PREV.br_blockcount - new->br_blockcount;
954
		XFS_BMAP_TRACE_PRE_UPDATE("LF|LC", ip, idx, XFS_DATA_FORK);
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		xfs_bmbt_set_blockcount(ep, temp);
		ip->i_df.if_lastex = idx - 1;
		if (cur == NULL)
			rval = XFS_ILOG_DEXT;
		else {
			rval = 0;
			if ((error = xfs_bmbt_lookup_eq(cur, LEFT.br_startoff,
					LEFT.br_startblock, LEFT.br_blockcount,
					&i)))
				goto done;
			ASSERT(i == 1);
			if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
					LEFT.br_startblock,
					LEFT.br_blockcount +
					new->br_blockcount,
					LEFT.br_state)))
				goto done;
		}
		temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
			STARTBLOCKVAL(PREV.br_startblock));
		xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
976
		XFS_BMAP_TRACE_POST_UPDATE("LF|LC", ip, idx, XFS_DATA_FORK);
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		*dnew = temp;
978 979 980 981
		/* DELTA: The boundary between two in-core extents moved. */
		temp = LEFT.br_startoff;
		temp2 = LEFT.br_blockcount +
			PREV.br_blockcount;
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		break;

	case MASK(LEFT_FILLING):
		/*
		 * Filling in the first part of a previous delayed allocation.
		 * The left neighbor is not contiguous.
		 */
989
		XFS_BMAP_TRACE_PRE_UPDATE("LF", ip, idx, XFS_DATA_FORK);
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		xfs_bmbt_set_startoff(ep, new_endoff);
		temp = PREV.br_blockcount - new->br_blockcount;
		xfs_bmbt_set_blockcount(ep, temp);
993
		XFS_BMAP_TRACE_INSERT("LF", ip, idx, 1, new, NULL,
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			XFS_DATA_FORK);
995
		xfs_iext_insert(ifp, idx, 1, new);
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		ip->i_df.if_lastex = idx;
		ip->i_d.di_nextents++;
		if (cur == NULL)
			rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
		else {
			rval = XFS_ILOG_CORE;
			if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
					new->br_startblock, new->br_blockcount,
					&i)))
				goto done;
			ASSERT(i == 0);
			cur->bc_rec.b.br_state = XFS_EXT_NORM;
			if ((error = xfs_bmbt_insert(cur, &i)))
				goto done;
			ASSERT(i == 1);
		}
		if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
		    ip->i_d.di_nextents > ip->i_df.if_ext_max) {
			error = xfs_bmap_extents_to_btree(ip->i_transp, ip,
					first, flist, &cur, 1, &tmp_rval,
					XFS_DATA_FORK);
			rval |= tmp_rval;
			if (error)
				goto done;
		}
		temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
			STARTBLOCKVAL(PREV.br_startblock) -
			(cur ? cur->bc_private.b.allocated : 0));
1024
		ep = xfs_iext_get_ext(ifp, idx + 1);
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		xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
1026
		XFS_BMAP_TRACE_POST_UPDATE("LF", ip, idx + 1, XFS_DATA_FORK);
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		*dnew = temp;
1028 1029 1030
		/* DELTA: One in-core extent is split in two. */
		temp = PREV.br_startoff;
		temp2 = PREV.br_blockcount;
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		break;

	case MASK2(RIGHT_FILLING, RIGHT_CONTIG):
		/*
		 * Filling in the last part of a previous delayed allocation.
		 * The right neighbor is contiguous with the new allocation.
		 */
		temp = PREV.br_blockcount - new->br_blockcount;
1039 1040
		XFS_BMAP_TRACE_PRE_UPDATE("RF|RC", ip, idx, XFS_DATA_FORK);
		XFS_BMAP_TRACE_PRE_UPDATE("RF|RC", ip, idx + 1, XFS_DATA_FORK);
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		xfs_bmbt_set_blockcount(ep, temp);
1042 1043
		xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, idx + 1),
			new->br_startoff, new->br_startblock,
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			new->br_blockcount + RIGHT.br_blockcount,
			RIGHT.br_state);
1046
		XFS_BMAP_TRACE_POST_UPDATE("RF|RC", ip, idx + 1, XFS_DATA_FORK);
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		ip->i_df.if_lastex = idx + 1;
		if (cur == NULL)
			rval = XFS_ILOG_DEXT;
		else {
			rval = 0;
			if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
					RIGHT.br_startblock,
					RIGHT.br_blockcount, &i)))
				goto done;
			ASSERT(i == 1);
			if ((error = xfs_bmbt_update(cur, new->br_startoff,
					new->br_startblock,
					new->br_blockcount +
					RIGHT.br_blockcount,
					RIGHT.br_state)))
				goto done;
		}
		temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
			STARTBLOCKVAL(PREV.br_startblock));
		xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
1067
		XFS_BMAP_TRACE_POST_UPDATE("RF|RC", ip, idx, XFS_DATA_FORK);
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		*dnew = temp;
1069 1070 1071 1072
		/* DELTA: The boundary between two in-core extents moved. */
		temp = PREV.br_startoff;
		temp2 = PREV.br_blockcount +
			RIGHT.br_blockcount;
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		break;

	case MASK(RIGHT_FILLING):
		/*
		 * Filling in the last part of a previous delayed allocation.
		 * The right neighbor is not contiguous.
		 */
		temp = PREV.br_blockcount - new->br_blockcount;
1081
		XFS_BMAP_TRACE_PRE_UPDATE("RF", ip, idx, XFS_DATA_FORK);
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		xfs_bmbt_set_blockcount(ep, temp);
1083 1084
		XFS_BMAP_TRACE_INSERT("RF", ip, idx + 1, 1, new, NULL,
			XFS_DATA_FORK);
1085
		xfs_iext_insert(ifp, idx + 1, 1, new);
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		ip->i_df.if_lastex = idx + 1;
		ip->i_d.di_nextents++;
		if (cur == NULL)
			rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
		else {
			rval = XFS_ILOG_CORE;
			if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
					new->br_startblock, new->br_blockcount,
					&i)))
				goto done;
			ASSERT(i == 0);
			cur->bc_rec.b.br_state = XFS_EXT_NORM;
			if ((error = xfs_bmbt_insert(cur, &i)))
				goto done;
			ASSERT(i == 1);
		}
		if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
		    ip->i_d.di_nextents > ip->i_df.if_ext_max) {
			error = xfs_bmap_extents_to_btree(ip->i_transp, ip,
				first, flist, &cur, 1, &tmp_rval,
				XFS_DATA_FORK);
			rval |= tmp_rval;
			if (error)
				goto done;
		}
		temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
			STARTBLOCKVAL(PREV.br_startblock) -
			(cur ? cur->bc_private.b.allocated : 0));
1114
		ep = xfs_iext_get_ext(ifp, idx);
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		xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
1116
		XFS_BMAP_TRACE_POST_UPDATE("RF", ip, idx, XFS_DATA_FORK);
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		*dnew = temp;
1118 1119 1120
		/* DELTA: One in-core extent is split in two. */
		temp = PREV.br_startoff;
		temp2 = PREV.br_blockcount;
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		break;

	case 0:
		/*
		 * Filling in the middle part of a previous delayed allocation.
		 * Contiguity is impossible here.
		 * This case is avoided almost all the time.
		 */
		temp = new->br_startoff - PREV.br_startoff;
1130
		XFS_BMAP_TRACE_PRE_UPDATE("0", ip, idx, XFS_DATA_FORK);
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		xfs_bmbt_set_blockcount(ep, temp);
		r[0] = *new;
1133 1134
		r[1].br_state = PREV.br_state;
		r[1].br_startblock = 0;
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		r[1].br_startoff = new_endoff;
		temp2 = PREV.br_startoff + PREV.br_blockcount - new_endoff;
		r[1].br_blockcount = temp2;
1138
		XFS_BMAP_TRACE_INSERT("0", ip, idx + 1, 2, &r[0], &r[1],
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			XFS_DATA_FORK);
1140
		xfs_iext_insert(ifp, idx + 1, 2, &r[0]);
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		ip->i_df.if_lastex = idx + 1;
		ip->i_d.di_nextents++;
		if (cur == NULL)
			rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
		else {
			rval = XFS_ILOG_CORE;
			if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
					new->br_startblock, new->br_blockcount,
					&i)))
				goto done;
			ASSERT(i == 0);
			cur->bc_rec.b.br_state = XFS_EXT_NORM;
			if ((error = xfs_bmbt_insert(cur, &i)))
				goto done;
			ASSERT(i == 1);
		}
		if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
		    ip->i_d.di_nextents > ip->i_df.if_ext_max) {
			error = xfs_bmap_extents_to_btree(ip->i_transp, ip,
					first, flist, &cur, 1, &tmp_rval,
					XFS_DATA_FORK);
			rval |= tmp_rval;
			if (error)
				goto done;
		}
		temp = xfs_bmap_worst_indlen(ip, temp);
		temp2 = xfs_bmap_worst_indlen(ip, temp2);
		diff = (int)(temp + temp2 - STARTBLOCKVAL(PREV.br_startblock) -
			(cur ? cur->bc_private.b.allocated : 0));
		if (diff > 0 &&
1171
		    xfs_mod_incore_sb(ip->i_mount, XFS_SBS_FDBLOCKS, -((int64_t)diff), rsvd)) {
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			/*
			 * Ick gross gag me with a spoon.
			 */
			ASSERT(0);	/* want to see if this ever happens! */
			while (diff > 0) {
				if (temp) {
					temp--;
					diff--;
					if (!diff ||
					    !xfs_mod_incore_sb(ip->i_mount,
1182
						    XFS_SBS_FDBLOCKS, -((int64_t)diff), rsvd))
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						break;
				}
				if (temp2) {
					temp2--;
					diff--;
					if (!diff ||
					    !xfs_mod_incore_sb(ip->i_mount,
1190
						    XFS_SBS_FDBLOCKS, -((int64_t)diff), rsvd))
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						break;
				}
			}
		}
1195
		ep = xfs_iext_get_ext(ifp, idx);
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		xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
1197 1198
		XFS_BMAP_TRACE_POST_UPDATE("0", ip, idx, XFS_DATA_FORK);
		XFS_BMAP_TRACE_PRE_UPDATE("0", ip, idx + 2, XFS_DATA_FORK);
1199 1200
		xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, idx + 2),
			NULLSTARTBLOCK((int)temp2));
1201
		XFS_BMAP_TRACE_POST_UPDATE("0", ip, idx + 2, XFS_DATA_FORK);
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		*dnew = temp + temp2;
1203 1204 1205
		/* DELTA: One in-core extent is split in three. */
		temp = PREV.br_startoff;
		temp2 = PREV.br_blockcount;
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		break;

	case MASK3(LEFT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
	case MASK3(RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
	case MASK2(LEFT_FILLING, RIGHT_CONTIG):
	case MASK2(RIGHT_FILLING, LEFT_CONTIG):
	case MASK2(LEFT_CONTIG, RIGHT_CONTIG):
	case MASK(LEFT_CONTIG):
	case MASK(RIGHT_CONTIG):
		/*
		 * These cases are all impossible.
		 */
		ASSERT(0);
	}
	*curp = cur;
1221 1222 1223 1224 1225 1226 1227
	if (delta) {
		temp2 += temp;
		if (delta->xed_startoff > temp)
			delta->xed_startoff = temp;
		if (delta->xed_blockcount < temp2)
			delta->xed_blockcount = temp2;
	}
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done:
	*logflagsp = rval;
	return error;
#undef	LEFT
#undef	RIGHT
#undef	PREV
#undef	MASK
#undef	MASK2
#undef	MASK3
#undef	MASK4
#undef	STATE_SET
#undef	STATE_TEST
#undef	STATE_SET_TEST
#undef	SWITCH_STATE
}

/*
 * Called by xfs_bmap_add_extent to handle cases converting an unwritten
 * allocation to a real allocation or vice versa.
 */
STATIC int				/* error */
xfs_bmap_add_extent_unwritten_real(
	xfs_inode_t		*ip,	/* incore inode pointer */
	xfs_extnum_t		idx,	/* extent number to update/insert */
	xfs_btree_cur_t		**curp,	/* if *curp is null, not a btree */
1253
	xfs_bmbt_irec_t		*new,	/* new data to add to file extents */
1254 1255
	int			*logflagsp, /* inode logging flags */
	xfs_extdelta_t		*delta) /* Change made to incore extents */
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{
	xfs_btree_cur_t		*cur;	/* btree cursor */
1258
	xfs_bmbt_rec_host_t	*ep;	/* extent entry for idx */
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	int			error;	/* error return value */
	int			i;	/* temp state */
1261
	xfs_ifork_t		*ifp;	/* inode fork pointer */
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	xfs_fileoff_t		new_endoff;	/* end offset of new entry */
	xfs_exntst_t		newext;	/* new extent state */
	xfs_exntst_t		oldext;	/* old extent state */
	xfs_bmbt_irec_t		r[3];	/* neighbor extent entries */
					/* left is 0, right is 1, prev is 2 */
	int			rval=0;	/* return value (logging flags) */
	int			state = 0;/* state bits, accessed thru macros */
1269 1270
	xfs_filblks_t		temp=0;
	xfs_filblks_t		temp2=0;
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	enum {				/* bit number definitions for state */
		LEFT_CONTIG,	RIGHT_CONTIG,
		LEFT_FILLING,	RIGHT_FILLING,
		LEFT_DELAY,	RIGHT_DELAY,
		LEFT_VALID,	RIGHT_VALID
	};

#define	LEFT		r[0]
#define	RIGHT		r[1]
#define	PREV		r[2]
#define	MASK(b)		(1 << (b))
#define	MASK2(a,b)	(MASK(a) | MASK(b))
#define	MASK3(a,b,c)	(MASK2(a,b) | MASK(c))
#define	MASK4(a,b,c,d)	(MASK3(a,b,c) | MASK(d))
#define	STATE_SET(b,v)	((v) ? (state |= MASK(b)) : (state &= ~MASK(b)))
#define	STATE_TEST(b)	(state & MASK(b))
#define	STATE_SET_TEST(b,v)	((v) ? ((state |= MASK(b)), 1) : \
				       ((state &= ~MASK(b)), 0))
#define	SWITCH_STATE		\
	(state & MASK4(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG))

	/*
	 * Set up a bunch of variables to make the tests simpler.
	 */
	error = 0;
	cur = *curp;
1297 1298
	ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
	ep = xfs_iext_get_ext(ifp, idx);
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	xfs_bmbt_get_all(ep, &PREV);
	newext = new->br_state;
	oldext = (newext == XFS_EXT_UNWRITTEN) ?
		XFS_EXT_NORM : XFS_EXT_UNWRITTEN;
	ASSERT(PREV.br_state == oldext);
	new_endoff = new->br_startoff + new->br_blockcount;
	ASSERT(PREV.br_startoff <= new->br_startoff);
	ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
	/*
	 * Set flags determining what part of the previous oldext allocation
	 * extent is being replaced by a newext allocation.
	 */
	STATE_SET(LEFT_FILLING, PREV.br_startoff == new->br_startoff);
	STATE_SET(RIGHT_FILLING,
		PREV.br_startoff + PREV.br_blockcount == new_endoff);
	/*
	 * Check and set flags if this segment has a left neighbor.
	 * Don't set contiguous if the combined extent would be too large.
	 */
	if (STATE_SET_TEST(LEFT_VALID, idx > 0)) {
1319
		xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx - 1), &LEFT);
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		STATE_SET(LEFT_DELAY, ISNULLSTARTBLOCK(LEFT.br_startblock));
	}
	STATE_SET(LEFT_CONTIG,
		STATE_TEST(LEFT_VALID) && !STATE_TEST(LEFT_DELAY) &&
		LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
		LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
		LEFT.br_state == newext &&
		LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN);
	/*
	 * Check and set flags if this segment has a right neighbor.
	 * Don't set contiguous if the combined extent would be too large.
	 * Also check for all-three-contiguous being too large.
	 */
	if (STATE_SET_TEST(RIGHT_VALID,
			idx <
			ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1)) {
1336
		xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx + 1), &RIGHT);
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		STATE_SET(RIGHT_DELAY, ISNULLSTARTBLOCK(RIGHT.br_startblock));
	}
	STATE_SET(RIGHT_CONTIG,
		STATE_TEST(RIGHT_VALID) && !STATE_TEST(RIGHT_DELAY) &&
		new_endoff == RIGHT.br_startoff &&
		new->br_startblock + new->br_blockcount ==
		    RIGHT.br_startblock &&
		newext == RIGHT.br_state &&
		new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
		((state & MASK3(LEFT_CONTIG, LEFT_FILLING, RIGHT_FILLING)) !=
		  MASK3(LEFT_CONTIG, LEFT_FILLING, RIGHT_FILLING) ||
		 LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
		     <= MAXEXTLEN));
	/*
	 * Switch out based on the FILLING and CONTIG state bits.
	 */
	switch (SWITCH_STATE) {

	case MASK4(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
		/*
		 * Setting all of a previous oldext extent to newext.
		 * The left and right neighbors are both contiguous with new.
		 */
1360
		XFS_BMAP_TRACE_PRE_UPDATE("LF|RF|LC|RC", ip, idx - 1,
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			XFS_DATA_FORK);
1362
		xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
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			LEFT.br_blockcount + PREV.br_blockcount +
			RIGHT.br_blockcount);
1365
		XFS_BMAP_TRACE_POST_UPDATE("LF|RF|LC|RC", ip, idx - 1,
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			XFS_DATA_FORK);
1367
		XFS_BMAP_TRACE_DELETE("LF|RF|LC|RC", ip, idx, 2, XFS_DATA_FORK);
1368
		xfs_iext_remove(ifp, idx, 2);
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		ip->i_df.if_lastex = idx - 1;
		ip->i_d.di_nextents -= 2;
		if (cur == NULL)
			rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
		else {
			rval = XFS_ILOG_CORE;
			if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
					RIGHT.br_startblock,
					RIGHT.br_blockcount, &i)))
				goto done;
			ASSERT(i == 1);
			if ((error = xfs_bmbt_delete(cur, &i)))
				goto done;
			ASSERT(i == 1);
			if ((error = xfs_bmbt_decrement(cur, 0, &i)))
				goto done;
			ASSERT(i == 1);
			if ((error = xfs_bmbt_delete(cur, &i)))
				goto done;
			ASSERT(i == 1);
			if ((error = xfs_bmbt_decrement(cur, 0, &i)))
				goto done;
			ASSERT(i == 1);
			if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
				LEFT.br_startblock,
				LEFT.br_blockcount + PREV.br_blockcount +
				RIGHT.br_blockcount, LEFT.br_state)))
				goto done;
		}
1398 1399 1400 1401 1402
		/* DELTA: Three in-core extents are replaced by one. */
		temp = LEFT.br_startoff;
		temp2 = LEFT.br_blockcount +
			PREV.br_blockcount +
			RIGHT.br_blockcount;
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		break;

	case MASK3(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG):
		/*
		 * Setting all of a previous oldext extent to newext.
		 * The left neighbor is contiguous, the right is not.
		 */
1410
		XFS_BMAP_TRACE_PRE_UPDATE("LF|RF|LC", ip, idx - 1,
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			XFS_DATA_FORK);
1412
		xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
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			LEFT.br_blockcount + PREV.br_blockcount);
1414
		XFS_BMAP_TRACE_POST_UPDATE("LF|RF|LC", ip, idx - 1,
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			XFS_DATA_FORK);
		ip->i_df.if_lastex = idx - 1;
1417
		XFS_BMAP_TRACE_DELETE("LF|RF|LC", ip, idx, 1, XFS_DATA_FORK);
1418
		xfs_iext_remove(ifp, idx, 1);
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		ip->i_d.di_nextents--;
		if (cur == NULL)
			rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
		else {
			rval = XFS_ILOG_CORE;
			if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
					PREV.br_startblock, PREV.br_blockcount,
					&i)))
				goto done;
			ASSERT(i == 1);
			if ((error = xfs_bmbt_delete(cur, &i)))
				goto done;
			ASSERT(i == 1);
			if ((error = xfs_bmbt_decrement(cur, 0, &i)))
				goto done;
			ASSERT(i == 1);
			if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
				LEFT.br_startblock,
				LEFT.br_blockcount + PREV.br_blockcount,
				LEFT.br_state)))
				goto done;
		}
1441 1442 1443 1444
		/* DELTA: Two in-core extents are replaced by one. */
		temp = LEFT.br_startoff;
		temp2 = LEFT.br_blockcount +
			PREV.br_blockcount;
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		break;

	case MASK3(LEFT_FILLING, RIGHT_FILLING, RIGHT_CONTIG):
		/*
		 * Setting all of a previous oldext extent to newext.
		 * The right neighbor is contiguous, the left is not.
		 */
1452
		XFS_BMAP_TRACE_PRE_UPDATE("LF|RF|RC", ip, idx,
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			XFS_DATA_FORK);
		xfs_bmbt_set_blockcount(ep,
			PREV.br_blockcount + RIGHT.br_blockcount);
		xfs_bmbt_set_state(ep, newext);
1457
		XFS_BMAP_TRACE_POST_UPDATE("LF|RF|RC", ip, idx,
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			XFS_DATA_FORK);
		ip->i_df.if_lastex = idx;
1460
		XFS_BMAP_TRACE_DELETE("LF|RF|RC", ip, idx + 1, 1, XFS_DATA_FORK);
1461
		xfs_iext_remove(ifp, idx + 1, 1);
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		ip->i_d.di_nextents--;
		if (cur == NULL)
			rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
		else {
			rval = XFS_ILOG_CORE;
			if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
					RIGHT.br_startblock,
					RIGHT.br_blockcount, &i)))
				goto done;
			ASSERT(i == 1);
			if ((error = xfs_bmbt_delete(cur, &i)))
				goto done;
			ASSERT(i == 1);
			if ((error = xfs_bmbt_decrement(cur, 0, &i)))
				goto done;
			ASSERT(i == 1);
			if ((error = xfs_bmbt_update(cur, new->br_startoff,
				new->br_startblock,
				new->br_blockcount + RIGHT.br_blockcount,
				newext)))
				goto done;
		}
1484 1485 1486 1487
		/* DELTA: Two in-core extents are replaced by one. */
		temp = PREV.br_startoff;
		temp2 = PREV.br_blockcount +
			RIGHT.br_blockcount;
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		break;

	case MASK2(LEFT_FILLING, RIGHT_FILLING):
		/*
		 * Setting all of a previous oldext extent to newext.
		 * Neither the left nor right neighbors are contiguous with
		 * the new one.
		 */
1496
		XFS_BMAP_TRACE_PRE_UPDATE("LF|RF", ip, idx,
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			XFS_DATA_FORK);
		xfs_bmbt_set_state(ep, newext);
1499
		XFS_BMAP_TRACE_POST_UPDATE("LF|RF", ip, idx,
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			XFS_DATA_FORK);
		ip->i_df.if_lastex = idx;
		if (cur == NULL)
			rval = XFS_ILOG_DEXT;
		else {
			rval = 0;
			if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
					new->br_startblock, new->br_blockcount,
					&i)))
				goto done;
			ASSERT(i == 1);
			if ((error = xfs_bmbt_update(cur, new->br_startoff,
				new->br_startblock, new->br_blockcount,
				newext)))
				goto done;
		}
1516 1517 1518
		/* DELTA: The in-core extent described by new changed type. */
		temp = new->br_startoff;
		temp2 = new->br_blockcount;
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		break;

	case MASK2(LEFT_FILLING, LEFT_CONTIG):
		/*
		 * Setting the first part of a previous oldext extent to newext.
		 * The left neighbor is contiguous.
		 */
1526
		XFS_BMAP_TRACE_PRE_UPDATE("LF|LC", ip, idx - 1,
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			XFS_DATA_FORK);
1528
		xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
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			LEFT.br_blockcount + new->br_blockcount);
		xfs_bmbt_set_startoff(ep,
			PREV.br_startoff + new->br_blockcount);
1532
		XFS_BMAP_TRACE_POST_UPDATE("LF|LC", ip, idx - 1,
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			XFS_DATA_FORK);
1534
		XFS_BMAP_TRACE_PRE_UPDATE("LF|LC", ip, idx,
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			XFS_DATA_FORK);
		xfs_bmbt_set_startblock(ep,
			new->br_startblock + new->br_blockcount);
		xfs_bmbt_set_blockcount(ep,
			PREV.br_blockcount - new->br_blockcount);
1540
		XFS_BMAP_TRACE_POST_UPDATE("LF|LC", ip, idx,
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			XFS_DATA_FORK);
		ip->i_df.if_lastex = idx - 1;
		if (cur == NULL)
			rval = XFS_ILOG_DEXT;
		else {
			rval = 0;
			if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
					PREV.br_startblock, PREV.br_blockcount,
					&i)))
				goto done;
			ASSERT(i == 1);
			if ((error = xfs_bmbt_update(cur,
				PREV.br_startoff + new->br_blockcount,
				PREV.br_startblock + new->br_blockcount,
				PREV.br_blockcount - new->br_blockcount,
				oldext)))
				goto done;
			if ((error = xfs_bmbt_decrement(cur, 0, &i)))
				goto done;
			if (xfs_bmbt_update(cur, LEFT.br_startoff,
				LEFT.br_startblock,
				LEFT.br_blockcount + new->br_blockcount,
				LEFT.br_state))
				goto done;
		}
1566 1567 1568 1569
		/* DELTA: The boundary between two in-core extents moved. */
		temp = LEFT.br_startoff;
		temp2 = LEFT.br_blockcount +
			PREV.br_blockcount;
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		break;

	case MASK(LEFT_FILLING):
		/*
		 * Setting the first part of a previous oldext extent to newext.
		 * The left neighbor is not contiguous.
		 */
1577
		XFS_BMAP_TRACE_PRE_UPDATE("LF", ip, idx, XFS_DATA_FORK);
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		ASSERT(ep && xfs_bmbt_get_state(ep) == oldext);
		xfs_bmbt_set_startoff(ep, new_endoff);
		xfs_bmbt_set_blockcount(ep,
			PREV.br_blockcount - new->br_blockcount);
		xfs_bmbt_set_startblock(ep,
			new->br_startblock + new->br_blockcount);
1584 1585
		XFS_BMAP_TRACE_POST_UPDATE("LF", ip, idx, XFS_DATA_FORK);
		XFS_BMAP_TRACE_INSERT("LF", ip, idx, 1, new, NULL,
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			XFS_DATA_FORK);
1587
		xfs_iext_insert(ifp, idx, 1, new);
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1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609
		ip->i_df.if_lastex = idx;
		ip->i_d.di_nextents++;
		if (cur == NULL)
			rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
		else {
			rval = XFS_ILOG_CORE;
			if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
					PREV.br_startblock, PREV.br_blockcount,
					&i)))
				goto done;
			ASSERT(i == 1);
			if ((error = xfs_bmbt_update(cur,
				PREV.br_startoff + new->br_blockcount,
				PREV.br_startblock + new->br_blockcount,
				PREV.br_blockcount - new->br_blockcount,
				oldext)))
				goto done;
			cur->bc_rec.b = *new;
			if ((error = xfs_bmbt_insert(cur, &i)))
				goto done;
			ASSERT(i == 1);
		}
1610 1611 1612
		/* DELTA: One in-core extent is split in two. */
		temp = PREV.br_startoff;
		temp2 = PREV.br_blockcount;
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		break;

	case MASK2(RIGHT_FILLING, RIGHT_CONTIG):
		/*
		 * Setting the last part of a previous oldext extent to newext.
		 * The right neighbor is contiguous with the new allocation.
		 */
1620
		XFS_BMAP_TRACE_PRE_UPDATE("RF|RC", ip, idx,
L
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1621
			XFS_DATA_FORK);
1622
		XFS_BMAP_TRACE_PRE_UPDATE("RF|RC", ip, idx + 1,
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			XFS_DATA_FORK);
		xfs_bmbt_set_blockcount(ep,
			PREV.br_blockcount - new->br_blockcount);
1626
		XFS_BMAP_TRACE_POST_UPDATE("RF|RC", ip, idx,
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			XFS_DATA_FORK);
1628 1629
		xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, idx + 1),
			new->br_startoff, new->br_startblock,
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			new->br_blockcount + RIGHT.br_blockcount, newext);
1631
		XFS_BMAP_TRACE_POST_UPDATE("RF|RC", ip, idx + 1,
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1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655
			XFS_DATA_FORK);
		ip->i_df.if_lastex = idx + 1;
		if (cur == NULL)
			rval = XFS_ILOG_DEXT;
		else {
			rval = 0;
			if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
					PREV.br_startblock,
					PREV.br_blockcount, &i)))
				goto done;
			ASSERT(i == 1);
			if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
				PREV.br_startblock,
				PREV.br_blockcount - new->br_blockcount,
				oldext)))
				goto done;
			if ((error = xfs_bmbt_increment(cur, 0, &i)))
				goto done;
			if ((error = xfs_bmbt_update(cur, new->br_startoff,
				new->br_startblock,
				new->br_blockcount + RIGHT.br_blockcount,
				newext)))
				goto done;
		}
1656 1657 1658 1659
		/* DELTA: The boundary between two in-core extents moved. */
		temp = PREV.br_startoff;
		temp2 = PREV.br_blockcount +
			RIGHT.br_blockcount;
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		break;

	case MASK(RIGHT_FILLING):
		/*
		 * Setting the last part of a previous oldext extent to newext.
		 * The right neighbor is not contiguous.
		 */
1667
		XFS_BMAP_TRACE_PRE_UPDATE("RF", ip, idx, XFS_DATA_FORK);
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		xfs_bmbt_set_blockcount(ep,
			PREV.br_blockcount - new->br_blockcount);
1670 1671 1672
		XFS_BMAP_TRACE_POST_UPDATE("RF", ip, idx, XFS_DATA_FORK);
		XFS_BMAP_TRACE_INSERT("RF", ip, idx + 1, 1, new, NULL,
			XFS_DATA_FORK);
1673
		xfs_iext_insert(ifp, idx + 1, 1, new);
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1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699
		ip->i_df.if_lastex = idx + 1;
		ip->i_d.di_nextents++;
		if (cur == NULL)
			rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
		else {
			rval = XFS_ILOG_CORE;
			if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
					PREV.br_startblock, PREV.br_blockcount,
					&i)))
				goto done;
			ASSERT(i == 1);
			if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
				PREV.br_startblock,
				PREV.br_blockcount - new->br_blockcount,
				oldext)))
				goto done;
			if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
					new->br_startblock, new->br_blockcount,
					&i)))
				goto done;
			ASSERT(i == 0);
			cur->bc_rec.b.br_state = XFS_EXT_NORM;
			if ((error = xfs_bmbt_insert(cur, &i)))
				goto done;
			ASSERT(i == 1);
		}
1700 1701 1702
		/* DELTA: One in-core extent is split in two. */
		temp = PREV.br_startoff;
		temp2 = PREV.br_blockcount;
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		break;

	case 0:
		/*
		 * Setting the middle part of a previous oldext extent to
		 * newext.  Contiguity is impossible here.
		 * One extent becomes three extents.
		 */
1711
		XFS_BMAP_TRACE_PRE_UPDATE("0", ip, idx, XFS_DATA_FORK);
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		xfs_bmbt_set_blockcount(ep,
			new->br_startoff - PREV.br_startoff);
1714
		XFS_BMAP_TRACE_POST_UPDATE("0", ip, idx, XFS_DATA_FORK);
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		r[0] = *new;
		r[1].br_startoff = new_endoff;
		r[1].br_blockcount =
			PREV.br_startoff + PREV.br_blockcount - new_endoff;
		r[1].br_startblock = new->br_startblock + new->br_blockcount;
		r[1].br_state = oldext;
1721
		XFS_BMAP_TRACE_INSERT("0", ip, idx + 1, 2, &r[0], &r[1],
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			XFS_DATA_FORK);
1723
		xfs_iext_insert(ifp, idx + 1, 2, &r[0]);
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		ip->i_df.if_lastex = idx + 1;
		ip->i_d.di_nextents += 2;
		if (cur == NULL)
			rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
		else {
			rval = XFS_ILOG_CORE;
			if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
					PREV.br_startblock, PREV.br_blockcount,
					&i)))
				goto done;
			ASSERT(i == 1);
			/* new right extent - oldext */
			if ((error = xfs_bmbt_update(cur, r[1].br_startoff,
				r[1].br_startblock, r[1].br_blockcount,
				r[1].br_state)))
				goto done;
			/* new left extent - oldext */
			PREV.br_blockcount =
				new->br_startoff - PREV.br_startoff;
			cur->bc_rec.b = PREV;
			if ((error = xfs_bmbt_insert(cur, &i)))
				goto done;
			ASSERT(i == 1);
			if ((error = xfs_bmbt_increment(cur, 0, &i)))
				goto done;
			ASSERT(i == 1);
			/* new middle extent - newext */
			cur->bc_rec.b = *new;
			if ((error = xfs_bmbt_insert(cur, &i)))
				goto done;
			ASSERT(i == 1);
		}
1756 1757 1758
		/* DELTA: One in-core extent is split in three. */
		temp = PREV.br_startoff;
		temp2 = PREV.br_blockcount;
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1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773
		break;

	case MASK3(LEFT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
	case MASK3(RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
	case MASK2(LEFT_FILLING, RIGHT_CONTIG):
	case MASK2(RIGHT_FILLING, LEFT_CONTIG):
	case MASK2(LEFT_CONTIG, RIGHT_CONTIG):
	case MASK(LEFT_CONTIG):
	case MASK(RIGHT_CONTIG):
		/*
		 * These cases are all impossible.
		 */
		ASSERT(0);
	}
	*curp = cur;
1774 1775 1776 1777 1778 1779 1780
	if (delta) {
		temp2 += temp;
		if (delta->xed_startoff > temp)
			delta->xed_startoff = temp;
		if (delta->xed_blockcount < temp2)
			delta->xed_blockcount = temp2;
	}
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done:
	*logflagsp = rval;
	return error;
#undef	LEFT
#undef	RIGHT
#undef	PREV
#undef	MASK
#undef	MASK2
#undef	MASK3
#undef	MASK4
#undef	STATE_SET
#undef	STATE_TEST
#undef	STATE_SET_TEST
#undef	SWITCH_STATE
}

/*
 * Called by xfs_bmap_add_extent to handle cases converting a hole
 * to a delayed allocation.
 */
/*ARGSUSED*/
STATIC int				/* error */
xfs_bmap_add_extent_hole_delay(
	xfs_inode_t		*ip,	/* incore inode pointer */
	xfs_extnum_t		idx,	/* extent number to update/insert */
1806
	xfs_bmbt_irec_t		*new,	/* new data to add to file extents */
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1807
	int			*logflagsp, /* inode logging flags */
1808
	xfs_extdelta_t		*delta, /* Change made to incore extents */
L
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	int			rsvd)		/* OK to allocate reserved blocks */
{
1811
	xfs_bmbt_rec_host_t	*ep;	/* extent record for idx */
1812
	xfs_ifork_t		*ifp;	/* inode fork pointer */
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	xfs_bmbt_irec_t		left;	/* left neighbor extent entry */
	xfs_filblks_t		newlen=0;	/* new indirect size */
	xfs_filblks_t		oldlen=0;	/* old indirect size */
	xfs_bmbt_irec_t		right;	/* right neighbor extent entry */
	int			state;  /* state bits, accessed thru macros */
1818 1819
	xfs_filblks_t		temp=0;	/* temp for indirect calculations */
	xfs_filblks_t		temp2=0;
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	enum {				/* bit number definitions for state */
		LEFT_CONTIG,	RIGHT_CONTIG,
		LEFT_DELAY,	RIGHT_DELAY,
		LEFT_VALID,	RIGHT_VALID
	};

#define	MASK(b)			(1 << (b))
#define	MASK2(a,b)		(MASK(a) | MASK(b))
#define	STATE_SET(b,v)		((v) ? (state |= MASK(b)) : (state &= ~MASK(b)))
#define	STATE_TEST(b)		(state & MASK(b))
#define	STATE_SET_TEST(b,v)	((v) ? ((state |= MASK(b)), 1) : \
				       ((state &= ~MASK(b)), 0))
#define	SWITCH_STATE		(state & MASK2(LEFT_CONTIG, RIGHT_CONTIG))

1834 1835
	ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
	ep = xfs_iext_get_ext(ifp, idx);
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	state = 0;
	ASSERT(ISNULLSTARTBLOCK(new->br_startblock));
	/*
	 * Check and set flags if this segment has a left neighbor
	 */
	if (STATE_SET_TEST(LEFT_VALID, idx > 0)) {
1842
		xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx - 1), &left);
L
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1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878
		STATE_SET(LEFT_DELAY, ISNULLSTARTBLOCK(left.br_startblock));
	}
	/*
	 * Check and set flags if the current (right) segment exists.
	 * If it doesn't exist, we're converting the hole at end-of-file.
	 */
	if (STATE_SET_TEST(RIGHT_VALID,
			   idx <
			   ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t))) {
		xfs_bmbt_get_all(ep, &right);
		STATE_SET(RIGHT_DELAY, ISNULLSTARTBLOCK(right.br_startblock));
	}
	/*
	 * Set contiguity flags on the left and right neighbors.
	 * Don't let extents get too large, even if the pieces are contiguous.
	 */
	STATE_SET(LEFT_CONTIG,
		STATE_TEST(LEFT_VALID) && STATE_TEST(LEFT_DELAY) &&
		left.br_startoff + left.br_blockcount == new->br_startoff &&
		left.br_blockcount + new->br_blockcount <= MAXEXTLEN);
	STATE_SET(RIGHT_CONTIG,
		STATE_TEST(RIGHT_VALID) && STATE_TEST(RIGHT_DELAY) &&
		new->br_startoff + new->br_blockcount == right.br_startoff &&
		new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
		(!STATE_TEST(LEFT_CONTIG) ||
		 (left.br_blockcount + new->br_blockcount +
		     right.br_blockcount <= MAXEXTLEN)));
	/*
	 * Switch out based on the contiguity flags.
	 */
	switch (SWITCH_STATE) {

	case MASK2(LEFT_CONTIG, RIGHT_CONTIG):
		/*
		 * New allocation is contiguous with delayed allocations
		 * on the left and on the right.
1879
		 * Merge all three into a single extent record.
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		 */
		temp = left.br_blockcount + new->br_blockcount +
			right.br_blockcount;
1883
		XFS_BMAP_TRACE_PRE_UPDATE("LC|RC", ip, idx - 1,
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			XFS_DATA_FORK);
1885
		xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1), temp);
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		oldlen = STARTBLOCKVAL(left.br_startblock) +
			STARTBLOCKVAL(new->br_startblock) +
			STARTBLOCKVAL(right.br_startblock);
		newlen = xfs_bmap_worst_indlen(ip, temp);
1890 1891
		xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, idx - 1),
			NULLSTARTBLOCK((int)newlen));
1892
		XFS_BMAP_TRACE_POST_UPDATE("LC|RC", ip, idx - 1,
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1893
			XFS_DATA_FORK);
1894
		XFS_BMAP_TRACE_DELETE("LC|RC", ip, idx, 1, XFS_DATA_FORK);
1895
		xfs_iext_remove(ifp, idx, 1);
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1896
		ip->i_df.if_lastex = idx - 1;
1897 1898 1899
		/* DELTA: Two in-core extents were replaced by one. */
		temp2 = temp;
		temp = left.br_startoff;
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1900 1901 1902 1903 1904 1905 1906 1907 1908
		break;

	case MASK(LEFT_CONTIG):
		/*
		 * New allocation is contiguous with a delayed allocation
		 * on the left.
		 * Merge the new allocation with the left neighbor.
		 */
		temp = left.br_blockcount + new->br_blockcount;
1909
		XFS_BMAP_TRACE_PRE_UPDATE("LC", ip, idx - 1,
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1910
			XFS_DATA_FORK);
1911
		xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1), temp);
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		oldlen = STARTBLOCKVAL(left.br_startblock) +
			STARTBLOCKVAL(new->br_startblock);
		newlen = xfs_bmap_worst_indlen(ip, temp);
1915 1916
		xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, idx - 1),
			NULLSTARTBLOCK((int)newlen));
1917
		XFS_BMAP_TRACE_POST_UPDATE("LC", ip, idx - 1,
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1918 1919
			XFS_DATA_FORK);
		ip->i_df.if_lastex = idx - 1;
1920 1921 1922
		/* DELTA: One in-core extent grew into a hole. */
		temp2 = temp;
		temp = left.br_startoff;
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1923 1924 1925 1926 1927 1928 1929 1930
		break;

	case MASK(RIGHT_CONTIG):
		/*
		 * New allocation is contiguous with a delayed allocation
		 * on the right.
		 * Merge the new allocation with the right neighbor.
		 */
1931
		XFS_BMAP_TRACE_PRE_UPDATE("RC", ip, idx, XFS_DATA_FORK);
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1932 1933 1934 1935 1936 1937
		temp = new->br_blockcount + right.br_blockcount;
		oldlen = STARTBLOCKVAL(new->br_startblock) +
			STARTBLOCKVAL(right.br_startblock);
		newlen = xfs_bmap_worst_indlen(ip, temp);
		xfs_bmbt_set_allf(ep, new->br_startoff,
			NULLSTARTBLOCK((int)newlen), temp, right.br_state);
1938
		XFS_BMAP_TRACE_POST_UPDATE("RC", ip, idx, XFS_DATA_FORK);
L
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1939
		ip->i_df.if_lastex = idx;
1940 1941 1942
		/* DELTA: One in-core extent grew into a hole. */
		temp2 = temp;
		temp = new->br_startoff;
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1943 1944 1945 1946 1947 1948 1949 1950 1951
		break;

	case 0:
		/*
		 * New allocation is not contiguous with another
		 * delayed allocation.
		 * Insert a new entry.
		 */
		oldlen = newlen = 0;
1952
		XFS_BMAP_TRACE_INSERT("0", ip, idx, 1, new, NULL,
L
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1953
			XFS_DATA_FORK);
1954
		xfs_iext_insert(ifp, idx, 1, new);
L
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1955
		ip->i_df.if_lastex = idx;
1956 1957 1958
		/* DELTA: A new in-core extent was added in a hole. */
		temp2 = new->br_blockcount;
		temp = new->br_startoff;
L
Linus Torvalds 已提交
1959 1960 1961 1962 1963
		break;
	}
	if (oldlen != newlen) {
		ASSERT(oldlen > newlen);
		xfs_mod_incore_sb(ip->i_mount, XFS_SBS_FDBLOCKS,
1964
			(int64_t)(oldlen - newlen), rsvd);
L
Linus Torvalds 已提交
1965 1966 1967 1968
		/*
		 * Nothing to do for disk quota accounting here.
		 */
	}
1969 1970 1971 1972 1973 1974 1975
	if (delta) {
		temp2 += temp;
		if (delta->xed_startoff > temp)
			delta->xed_startoff = temp;
		if (delta->xed_blockcount < temp2)
			delta->xed_blockcount = temp2;
	}
L
Linus Torvalds 已提交
1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994
	*logflagsp = 0;
	return 0;
#undef	MASK
#undef	MASK2
#undef	STATE_SET
#undef	STATE_TEST
#undef	STATE_SET_TEST
#undef	SWITCH_STATE
}

/*
 * Called by xfs_bmap_add_extent to handle cases converting a hole
 * to a real allocation.
 */
STATIC int				/* error */
xfs_bmap_add_extent_hole_real(
	xfs_inode_t		*ip,	/* incore inode pointer */
	xfs_extnum_t		idx,	/* extent number to update/insert */
	xfs_btree_cur_t		*cur,	/* if null, not a btree */
1995
	xfs_bmbt_irec_t		*new,	/* new data to add to file extents */
L
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1996
	int			*logflagsp, /* inode logging flags */
1997
	xfs_extdelta_t		*delta, /* Change made to incore extents */
L
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1998 1999
	int			whichfork) /* data or attr fork */
{
2000
	xfs_bmbt_rec_host_t	*ep;	/* pointer to extent entry ins. point */
L
Linus Torvalds 已提交
2001 2002 2003 2004 2005
	int			error;	/* error return value */
	int			i;	/* temp state */
	xfs_ifork_t		*ifp;	/* inode fork pointer */
	xfs_bmbt_irec_t		left;	/* left neighbor extent entry */
	xfs_bmbt_irec_t		right;	/* right neighbor extent entry */
2006
	int			rval=0;	/* return value (logging flags) */
L
Linus Torvalds 已提交
2007
	int			state;	/* state bits, accessed thru macros */
2008 2009
	xfs_filblks_t		temp=0;
	xfs_filblks_t		temp2=0;
L
Linus Torvalds 已提交
2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025
	enum {				/* bit number definitions for state */
		LEFT_CONTIG,	RIGHT_CONTIG,
		LEFT_DELAY,	RIGHT_DELAY,
		LEFT_VALID,	RIGHT_VALID
	};

#define	MASK(b)			(1 << (b))
#define	MASK2(a,b)		(MASK(a) | MASK(b))
#define	STATE_SET(b,v)		((v) ? (state |= MASK(b)) : (state &= ~MASK(b)))
#define	STATE_TEST(b)		(state & MASK(b))
#define	STATE_SET_TEST(b,v)	((v) ? ((state |= MASK(b)), 1) : \
				       ((state &= ~MASK(b)), 0))
#define	SWITCH_STATE		(state & MASK2(LEFT_CONTIG, RIGHT_CONTIG))

	ifp = XFS_IFORK_PTR(ip, whichfork);
	ASSERT(idx <= ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t));
2026
	ep = xfs_iext_get_ext(ifp, idx);
L
Linus Torvalds 已提交
2027 2028 2029 2030 2031
	state = 0;
	/*
	 * Check and set flags if this segment has a left neighbor.
	 */
	if (STATE_SET_TEST(LEFT_VALID, idx > 0)) {
2032
		xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx - 1), &left);
L
Linus Torvalds 已提交
2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065
		STATE_SET(LEFT_DELAY, ISNULLSTARTBLOCK(left.br_startblock));
	}
	/*
	 * Check and set flags if this segment has a current value.
	 * Not true if we're inserting into the "hole" at eof.
	 */
	if (STATE_SET_TEST(RIGHT_VALID,
			   idx <
			   ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t))) {
		xfs_bmbt_get_all(ep, &right);
		STATE_SET(RIGHT_DELAY, ISNULLSTARTBLOCK(right.br_startblock));
	}
	/*
	 * We're inserting a real allocation between "left" and "right".
	 * Set the contiguity flags.  Don't let extents get too large.
	 */
	STATE_SET(LEFT_CONTIG,
		STATE_TEST(LEFT_VALID) && !STATE_TEST(LEFT_DELAY) &&
		left.br_startoff + left.br_blockcount == new->br_startoff &&
		left.br_startblock + left.br_blockcount == new->br_startblock &&
		left.br_state == new->br_state &&
		left.br_blockcount + new->br_blockcount <= MAXEXTLEN);
	STATE_SET(RIGHT_CONTIG,
		STATE_TEST(RIGHT_VALID) && !STATE_TEST(RIGHT_DELAY) &&
		new->br_startoff + new->br_blockcount == right.br_startoff &&
		new->br_startblock + new->br_blockcount ==
		    right.br_startblock &&
		new->br_state == right.br_state &&
		new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
		(!STATE_TEST(LEFT_CONTIG) ||
		 left.br_blockcount + new->br_blockcount +
		     right.br_blockcount <= MAXEXTLEN));

2066
	error = 0;
L
Linus Torvalds 已提交
2067 2068 2069 2070 2071 2072 2073 2074 2075
	/*
	 * Select which case we're in here, and implement it.
	 */
	switch (SWITCH_STATE) {

	case MASK2(LEFT_CONTIG, RIGHT_CONTIG):
		/*
		 * New allocation is contiguous with real allocations on the
		 * left and on the right.
2076
		 * Merge all three into a single extent record.
L
Linus Torvalds 已提交
2077
		 */
2078
		XFS_BMAP_TRACE_PRE_UPDATE("LC|RC", ip, idx - 1,
L
Linus Torvalds 已提交
2079
			whichfork);
2080
		xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
L
Linus Torvalds 已提交
2081 2082
			left.br_blockcount + new->br_blockcount +
			right.br_blockcount);
2083
		XFS_BMAP_TRACE_POST_UPDATE("LC|RC", ip, idx - 1,
L
Linus Torvalds 已提交
2084
			whichfork);
2085
		XFS_BMAP_TRACE_DELETE("LC|RC", ip, idx, 1, whichfork);
2086
		xfs_iext_remove(ifp, idx, 1);
L
Linus Torvalds 已提交
2087 2088 2089 2090
		ifp->if_lastex = idx - 1;
		XFS_IFORK_NEXT_SET(ip, whichfork,
			XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
		if (cur == NULL) {
2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112
			rval = XFS_ILOG_CORE | XFS_ILOG_FEXT(whichfork);
		} else {
			rval = XFS_ILOG_CORE;
			if ((error = xfs_bmbt_lookup_eq(cur,
					right.br_startoff,
					right.br_startblock,
					right.br_blockcount, &i)))
				goto done;
			ASSERT(i == 1);
			if ((error = xfs_bmbt_delete(cur, &i)))
				goto done;
			ASSERT(i == 1);
			if ((error = xfs_bmbt_decrement(cur, 0, &i)))
				goto done;
			ASSERT(i == 1);
			if ((error = xfs_bmbt_update(cur, left.br_startoff,
					left.br_startblock,
					left.br_blockcount +
						new->br_blockcount +
						right.br_blockcount,
					left.br_state)))
				goto done;
L
Linus Torvalds 已提交
2113
		}
2114 2115 2116 2117 2118 2119
		/* DELTA: Two in-core extents were replaced by one. */
		temp = left.br_startoff;
		temp2 = left.br_blockcount +
			new->br_blockcount +
			right.br_blockcount;
		break;
L
Linus Torvalds 已提交
2120 2121 2122 2123 2124 2125 2126

	case MASK(LEFT_CONTIG):
		/*
		 * New allocation is contiguous with a real allocation
		 * on the left.
		 * Merge the new allocation with the left neighbor.
		 */
2127
		XFS_BMAP_TRACE_PRE_UPDATE("LC", ip, idx - 1, whichfork);
2128
		xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
L
Linus Torvalds 已提交
2129
			left.br_blockcount + new->br_blockcount);
2130
		XFS_BMAP_TRACE_POST_UPDATE("LC", ip, idx - 1, whichfork);
L
Linus Torvalds 已提交
2131 2132
		ifp->if_lastex = idx - 1;
		if (cur == NULL) {
2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147
			rval = XFS_ILOG_FEXT(whichfork);
		} else {
			rval = 0;
			if ((error = xfs_bmbt_lookup_eq(cur,
					left.br_startoff,
					left.br_startblock,
					left.br_blockcount, &i)))
				goto done;
			ASSERT(i == 1);
			if ((error = xfs_bmbt_update(cur, left.br_startoff,
					left.br_startblock,
					left.br_blockcount +
						new->br_blockcount,
					left.br_state)))
				goto done;
L
Linus Torvalds 已提交
2148
		}
2149 2150 2151 2152 2153
		/* DELTA: One in-core extent grew. */
		temp = left.br_startoff;
		temp2 = left.br_blockcount +
			new->br_blockcount;
		break;
L
Linus Torvalds 已提交
2154 2155 2156 2157 2158 2159 2160

	case MASK(RIGHT_CONTIG):
		/*
		 * New allocation is contiguous with a real allocation
		 * on the right.
		 * Merge the new allocation with the right neighbor.
		 */
2161
		XFS_BMAP_TRACE_PRE_UPDATE("RC", ip, idx, whichfork);
L
Linus Torvalds 已提交
2162 2163 2164
		xfs_bmbt_set_allf(ep, new->br_startoff, new->br_startblock,
			new->br_blockcount + right.br_blockcount,
			right.br_state);
2165
		XFS_BMAP_TRACE_POST_UPDATE("RC", ip, idx, whichfork);
L
Linus Torvalds 已提交
2166 2167
		ifp->if_lastex = idx;
		if (cur == NULL) {
2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182
			rval = XFS_ILOG_FEXT(whichfork);
		} else {
			rval = 0;
			if ((error = xfs_bmbt_lookup_eq(cur,
					right.br_startoff,
					right.br_startblock,
					right.br_blockcount, &i)))
				goto done;
			ASSERT(i == 1);
			if ((error = xfs_bmbt_update(cur, new->br_startoff,
					new->br_startblock,
					new->br_blockcount +
						right.br_blockcount,
					right.br_state)))
				goto done;
L
Linus Torvalds 已提交
2183
		}
2184 2185 2186 2187 2188
		/* DELTA: One in-core extent grew. */
		temp = new->br_startoff;
		temp2 = new->br_blockcount +
			right.br_blockcount;
		break;
L
Linus Torvalds 已提交
2189 2190 2191 2192 2193 2194 2195

	case 0:
		/*
		 * New allocation is not contiguous with another
		 * real allocation.
		 * Insert a new entry.
		 */
2196
		XFS_BMAP_TRACE_INSERT("0", ip, idx, 1, new, NULL, whichfork);
2197
		xfs_iext_insert(ifp, idx, 1, new);
L
Linus Torvalds 已提交
2198 2199 2200 2201
		ifp->if_lastex = idx;
		XFS_IFORK_NEXT_SET(ip, whichfork,
			XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
		if (cur == NULL) {
2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214
			rval = XFS_ILOG_CORE | XFS_ILOG_FEXT(whichfork);
		} else {
			rval = XFS_ILOG_CORE;
			if ((error = xfs_bmbt_lookup_eq(cur,
					new->br_startoff,
					new->br_startblock,
					new->br_blockcount, &i)))
				goto done;
			ASSERT(i == 0);
			cur->bc_rec.b.br_state = new->br_state;
			if ((error = xfs_bmbt_insert(cur, &i)))
				goto done;
			ASSERT(i == 1);
L
Linus Torvalds 已提交
2215
		}
2216 2217 2218 2219
		/* DELTA: A new extent was added in a hole. */
		temp = new->br_startoff;
		temp2 = new->br_blockcount;
		break;
L
Linus Torvalds 已提交
2220
	}
2221 2222 2223 2224 2225 2226 2227 2228 2229 2230
	if (delta) {
		temp2 += temp;
		if (delta->xed_startoff > temp)
			delta->xed_startoff = temp;
		if (delta->xed_blockcount < temp2)
			delta->xed_blockcount = temp2;
	}
done:
	*logflagsp = rval;
	return error;
L
Linus Torvalds 已提交
2231 2232 2233 2234 2235 2236 2237 2238
#undef	MASK
#undef	MASK2
#undef	STATE_SET
#undef	STATE_TEST
#undef	STATE_SET_TEST
#undef	SWITCH_STATE
}

2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401
/*
 * Adjust the size of the new extent based on di_extsize and rt extsize.
 */
STATIC int
xfs_bmap_extsize_align(
	xfs_mount_t	*mp,
	xfs_bmbt_irec_t	*gotp,		/* next extent pointer */
	xfs_bmbt_irec_t	*prevp,		/* previous extent pointer */
	xfs_extlen_t	extsz,		/* align to this extent size */
	int		rt,		/* is this a realtime inode? */
	int		eof,		/* is extent at end-of-file? */
	int		delay,		/* creating delalloc extent? */
	int		convert,	/* overwriting unwritten extent? */
	xfs_fileoff_t	*offp,		/* in/out: aligned offset */
	xfs_extlen_t	*lenp)		/* in/out: aligned length */
{
	xfs_fileoff_t	orig_off;	/* original offset */
	xfs_extlen_t	orig_alen;	/* original length */
	xfs_fileoff_t	orig_end;	/* original off+len */
	xfs_fileoff_t	nexto;		/* next file offset */
	xfs_fileoff_t	prevo;		/* previous file offset */
	xfs_fileoff_t	align_off;	/* temp for offset */
	xfs_extlen_t	align_alen;	/* temp for length */
	xfs_extlen_t	temp;		/* temp for calculations */

	if (convert)
		return 0;

	orig_off = align_off = *offp;
	orig_alen = align_alen = *lenp;
	orig_end = orig_off + orig_alen;

	/*
	 * If this request overlaps an existing extent, then don't
	 * attempt to perform any additional alignment.
	 */
	if (!delay && !eof &&
	    (orig_off >= gotp->br_startoff) &&
	    (orig_end <= gotp->br_startoff + gotp->br_blockcount)) {
		return 0;
	}

	/*
	 * If the file offset is unaligned vs. the extent size
	 * we need to align it.  This will be possible unless
	 * the file was previously written with a kernel that didn't
	 * perform this alignment, or if a truncate shot us in the
	 * foot.
	 */
	temp = do_mod(orig_off, extsz);
	if (temp) {
		align_alen += temp;
		align_off -= temp;
	}
	/*
	 * Same adjustment for the end of the requested area.
	 */
	if ((temp = (align_alen % extsz))) {
		align_alen += extsz - temp;
	}
	/*
	 * If the previous block overlaps with this proposed allocation
	 * then move the start forward without adjusting the length.
	 */
	if (prevp->br_startoff != NULLFILEOFF) {
		if (prevp->br_startblock == HOLESTARTBLOCK)
			prevo = prevp->br_startoff;
		else
			prevo = prevp->br_startoff + prevp->br_blockcount;
	} else
		prevo = 0;
	if (align_off != orig_off && align_off < prevo)
		align_off = prevo;
	/*
	 * If the next block overlaps with this proposed allocation
	 * then move the start back without adjusting the length,
	 * but not before offset 0.
	 * This may of course make the start overlap previous block,
	 * and if we hit the offset 0 limit then the next block
	 * can still overlap too.
	 */
	if (!eof && gotp->br_startoff != NULLFILEOFF) {
		if ((delay && gotp->br_startblock == HOLESTARTBLOCK) ||
		    (!delay && gotp->br_startblock == DELAYSTARTBLOCK))
			nexto = gotp->br_startoff + gotp->br_blockcount;
		else
			nexto = gotp->br_startoff;
	} else
		nexto = NULLFILEOFF;
	if (!eof &&
	    align_off + align_alen != orig_end &&
	    align_off + align_alen > nexto)
		align_off = nexto > align_alen ? nexto - align_alen : 0;
	/*
	 * If we're now overlapping the next or previous extent that
	 * means we can't fit an extsz piece in this hole.  Just move
	 * the start forward to the first valid spot and set
	 * the length so we hit the end.
	 */
	if (align_off != orig_off && align_off < prevo)
		align_off = prevo;
	if (align_off + align_alen != orig_end &&
	    align_off + align_alen > nexto &&
	    nexto != NULLFILEOFF) {
		ASSERT(nexto > prevo);
		align_alen = nexto - align_off;
	}

	/*
	 * If realtime, and the result isn't a multiple of the realtime
	 * extent size we need to remove blocks until it is.
	 */
	if (rt && (temp = (align_alen % mp->m_sb.sb_rextsize))) {
		/*
		 * We're not covering the original request, or
		 * we won't be able to once we fix the length.
		 */
		if (orig_off < align_off ||
		    orig_end > align_off + align_alen ||
		    align_alen - temp < orig_alen)
			return XFS_ERROR(EINVAL);
		/*
		 * Try to fix it by moving the start up.
		 */
		if (align_off + temp <= orig_off) {
			align_alen -= temp;
			align_off += temp;
		}
		/*
		 * Try to fix it by moving the end in.
		 */
		else if (align_off + align_alen - temp >= orig_end)
			align_alen -= temp;
		/*
		 * Set the start to the minimum then trim the length.
		 */
		else {
			align_alen -= orig_off - align_off;
			align_off = orig_off;
			align_alen -= align_alen % mp->m_sb.sb_rextsize;
		}
		/*
		 * Result doesn't cover the request, fail it.
		 */
		if (orig_off < align_off || orig_end > align_off + align_alen)
			return XFS_ERROR(EINVAL);
	} else {
		ASSERT(orig_off >= align_off);
		ASSERT(orig_end <= align_off + align_alen);
	}

#ifdef DEBUG
	if (!eof && gotp->br_startoff != NULLFILEOFF)
		ASSERT(align_off + align_alen <= gotp->br_startoff);
	if (prevp->br_startoff != NULLFILEOFF)
		ASSERT(align_off >= prevp->br_startoff + prevp->br_blockcount);
#endif

	*lenp = align_alen;
	*offp = align_off;
	return 0;
}

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#define XFS_ALLOC_GAP_UNITS	4

2404
STATIC int
2405
xfs_bmap_adjacent(
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	xfs_bmalloca_t	*ap)		/* bmap alloc argument struct */
{
	xfs_fsblock_t	adjust;		/* adjustment to block numbers */
	xfs_agnumber_t	fb_agno;	/* ag number of ap->firstblock */
	xfs_mount_t	*mp;		/* mount point structure */
	int		nullfb;		/* true if ap->firstblock isn't set */
	int		rt;		/* true if inode is realtime */

#define	ISVALID(x,y)	\
	(rt ? \
		(x) < mp->m_sb.sb_rblocks : \
		XFS_FSB_TO_AGNO(mp, x) == XFS_FSB_TO_AGNO(mp, y) && \
		XFS_FSB_TO_AGNO(mp, x) < mp->m_sb.sb_agcount && \
		XFS_FSB_TO_AGBNO(mp, x) < mp->m_sb.sb_agblocks)

	mp = ap->ip->i_mount;
	nullfb = ap->firstblock == NULLFSBLOCK;
	rt = XFS_IS_REALTIME_INODE(ap->ip) && ap->userdata;
	fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp, ap->firstblock);
	/*
	 * If allocating at eof, and there's a previous real block,
	 * try to use it's last block as our starting point.
	 */
	if (ap->eof && ap->prevp->br_startoff != NULLFILEOFF &&
	    !ISNULLSTARTBLOCK(ap->prevp->br_startblock) &&
	    ISVALID(ap->prevp->br_startblock + ap->prevp->br_blockcount,
		    ap->prevp->br_startblock)) {
		ap->rval = ap->prevp->br_startblock + ap->prevp->br_blockcount;
		/*
		 * Adjust for the gap between prevp and us.
		 */
		adjust = ap->off -
			(ap->prevp->br_startoff + ap->prevp->br_blockcount);
		if (adjust &&
		    ISVALID(ap->rval + adjust, ap->prevp->br_startblock))
			ap->rval += adjust;
	}
	/*
	 * If not at eof, then compare the two neighbor blocks.
	 * Figure out whether either one gives us a good starting point,
	 * and pick the better one.
	 */
	else if (!ap->eof) {
		xfs_fsblock_t	gotbno;		/* right side block number */
		xfs_fsblock_t	gotdiff=0;	/* right side difference */
		xfs_fsblock_t	prevbno;	/* left side block number */
		xfs_fsblock_t	prevdiff=0;	/* left side difference */

		/*
		 * If there's a previous (left) block, select a requested
		 * start block based on it.
		 */
		if (ap->prevp->br_startoff != NULLFILEOFF &&
		    !ISNULLSTARTBLOCK(ap->prevp->br_startblock) &&
		    (prevbno = ap->prevp->br_startblock +
			       ap->prevp->br_blockcount) &&
		    ISVALID(prevbno, ap->prevp->br_startblock)) {
			/*
			 * Calculate gap to end of previous block.
			 */
			adjust = prevdiff = ap->off -
				(ap->prevp->br_startoff +
				 ap->prevp->br_blockcount);
			/*
			 * Figure the startblock based on the previous block's
			 * end and the gap size.
			 * Heuristic!
			 * If the gap is large relative to the piece we're
			 * allocating, or using it gives us an invalid block
			 * number, then just use the end of the previous block.
			 */
			if (prevdiff <= XFS_ALLOC_GAP_UNITS * ap->alen &&
			    ISVALID(prevbno + prevdiff,
				    ap->prevp->br_startblock))
				prevbno += adjust;
			else
				prevdiff += adjust;
			/*
			 * If the firstblock forbids it, can't use it,
			 * must use default.
			 */
			if (!rt && !nullfb &&
			    XFS_FSB_TO_AGNO(mp, prevbno) != fb_agno)
				prevbno = NULLFSBLOCK;
		}
		/*
		 * No previous block or can't follow it, just default.
		 */
		else
			prevbno = NULLFSBLOCK;
		/*
		 * If there's a following (right) block, select a requested
		 * start block based on it.
		 */
		if (!ISNULLSTARTBLOCK(ap->gotp->br_startblock)) {
			/*
			 * Calculate gap to start of next block.
			 */
			adjust = gotdiff = ap->gotp->br_startoff - ap->off;
			/*
			 * Figure the startblock based on the next block's
			 * start and the gap size.
			 */
			gotbno = ap->gotp->br_startblock;
			/*
			 * Heuristic!
			 * If the gap is large relative to the piece we're
			 * allocating, or using it gives us an invalid block
			 * number, then just use the start of the next block
			 * offset by our length.
			 */
			if (gotdiff <= XFS_ALLOC_GAP_UNITS * ap->alen &&
			    ISVALID(gotbno - gotdiff, gotbno))
				gotbno -= adjust;
			else if (ISVALID(gotbno - ap->alen, gotbno)) {
				gotbno -= ap->alen;
				gotdiff += adjust - ap->alen;
			} else
				gotdiff += adjust;
			/*
			 * If the firstblock forbids it, can't use it,
			 * must use default.
			 */
			if (!rt && !nullfb &&
			    XFS_FSB_TO_AGNO(mp, gotbno) != fb_agno)
				gotbno = NULLFSBLOCK;
		}
		/*
		 * No next block, just default.
		 */
		else
			gotbno = NULLFSBLOCK;
		/*
		 * If both valid, pick the better one, else the only good
		 * one, else ap->rval is already set (to 0 or the inode block).
		 */
		if (prevbno != NULLFSBLOCK && gotbno != NULLFSBLOCK)
			ap->rval = prevdiff <= gotdiff ? prevbno : gotbno;
		else if (prevbno != NULLFSBLOCK)
			ap->rval = prevbno;
		else if (gotbno != NULLFSBLOCK)
			ap->rval = gotbno;
	}
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#undef ISVALID
	return 0;
}

STATIC int
xfs_bmap_rtalloc(
	xfs_bmalloca_t	*ap)		/* bmap alloc argument struct */
{
	xfs_alloctype_t	atype = 0;	/* type for allocation routines */
	int		error;		/* error return value */
	xfs_mount_t	*mp;		/* mount point structure */
	xfs_extlen_t	prod = 0;	/* product factor for allocators */
	xfs_extlen_t	ralen = 0;	/* realtime allocation length */
	xfs_extlen_t	align;		/* minimum allocation alignment */
	xfs_rtblock_t	rtb;

	mp = ap->ip->i_mount;
2566
	align = xfs_get_extsz_hint(ap->ip);
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	prod = align / mp->m_sb.sb_rextsize;
	error = xfs_bmap_extsize_align(mp, ap->gotp, ap->prevp,
					align, 1, ap->eof, 0,
					ap->conv, &ap->off, &ap->alen);
	if (error)
		return error;
	ASSERT(ap->alen);
	ASSERT(ap->alen % mp->m_sb.sb_rextsize == 0);

	/*
	 * If the offset & length are not perfectly aligned
	 * then kill prod, it will just get us in trouble.
	 */
	if (do_mod(ap->off, align) || ap->alen % align)
		prod = 1;
	/*
	 * Set ralen to be the actual requested length in rtextents.
	 */
	ralen = ap->alen / mp->m_sb.sb_rextsize;
	/*
	 * If the old value was close enough to MAXEXTLEN that
	 * we rounded up to it, cut it back so it's valid again.
	 * Note that if it's a really large request (bigger than
	 * MAXEXTLEN), we don't hear about that number, and can't
	 * adjust the starting point to match it.
	 */
	if (ralen * mp->m_sb.sb_rextsize >= MAXEXTLEN)
		ralen = MAXEXTLEN / mp->m_sb.sb_rextsize;
	/*
	 * If it's an allocation to an empty file at offset 0,
	 * pick an extent that will space things out in the rt area.
	 */
	if (ap->eof && ap->off == 0) {
2600 2601
		xfs_rtblock_t uninitialized_var(rtx); /* realtime extent no */

2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672
		error = xfs_rtpick_extent(mp, ap->tp, ralen, &rtx);
		if (error)
			return error;
		ap->rval = rtx * mp->m_sb.sb_rextsize;
	} else {
		ap->rval = 0;
	}

	xfs_bmap_adjacent(ap);

	/*
	 * Realtime allocation, done through xfs_rtallocate_extent.
	 */
	atype = ap->rval == 0 ?  XFS_ALLOCTYPE_ANY_AG : XFS_ALLOCTYPE_NEAR_BNO;
	do_div(ap->rval, mp->m_sb.sb_rextsize);
	rtb = ap->rval;
	ap->alen = ralen;
	if ((error = xfs_rtallocate_extent(ap->tp, ap->rval, 1, ap->alen,
				&ralen, atype, ap->wasdel, prod, &rtb)))
		return error;
	if (rtb == NULLFSBLOCK && prod > 1 &&
	    (error = xfs_rtallocate_extent(ap->tp, ap->rval, 1,
					   ap->alen, &ralen, atype,
					   ap->wasdel, 1, &rtb)))
		return error;
	ap->rval = rtb;
	if (ap->rval != NULLFSBLOCK) {
		ap->rval *= mp->m_sb.sb_rextsize;
		ralen *= mp->m_sb.sb_rextsize;
		ap->alen = ralen;
		ap->ip->i_d.di_nblocks += ralen;
		xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
		if (ap->wasdel)
			ap->ip->i_delayed_blks -= ralen;
		/*
		 * Adjust the disk quota also. This was reserved
		 * earlier.
		 */
		XFS_TRANS_MOD_DQUOT_BYINO(mp, ap->tp, ap->ip,
			ap->wasdel ? XFS_TRANS_DQ_DELRTBCOUNT :
					XFS_TRANS_DQ_RTBCOUNT, (long) ralen);
	} else {
		ap->alen = 0;
	}
	return 0;
}

STATIC int
xfs_bmap_btalloc(
	xfs_bmalloca_t	*ap)		/* bmap alloc argument struct */
{
	xfs_mount_t	*mp;		/* mount point structure */
	xfs_alloctype_t	atype = 0;	/* type for allocation routines */
	xfs_extlen_t	align;		/* minimum allocation alignment */
	xfs_agnumber_t	ag;
	xfs_agnumber_t	fb_agno;	/* ag number of ap->firstblock */
	xfs_agnumber_t	startag;
	xfs_alloc_arg_t	args;
	xfs_extlen_t	blen;
	xfs_extlen_t	delta;
	xfs_extlen_t	longest;
	xfs_extlen_t	need;
	xfs_extlen_t	nextminlen = 0;
	xfs_perag_t	*pag;
	int		nullfb;		/* true if ap->firstblock isn't set */
	int		isaligned;
	int		notinit;
	int		tryagain;
	int		error;

	mp = ap->ip->i_mount;
2673
	align = ap->userdata ? xfs_get_extsz_hint(ap->ip) : 0;
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	if (unlikely(align)) {
		error = xfs_bmap_extsize_align(mp, ap->gotp, ap->prevp,
						align, 0, ap->eof, 0, ap->conv,
						&ap->off, &ap->alen);
		ASSERT(!error);
		ASSERT(ap->alen);
	}
	nullfb = ap->firstblock == NULLFSBLOCK;
	fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp, ap->firstblock);
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	if (nullfb) {
		if (ap->userdata && xfs_inode_is_filestream(ap->ip)) {
			ag = xfs_filestream_lookup_ag(ap->ip);
			ag = (ag != NULLAGNUMBER) ? ag : 0;
			ap->rval = XFS_AGB_TO_FSB(mp, ag, 0);
		} else {
			ap->rval = XFS_INO_TO_FSB(mp, ap->ip->i_ino);
		}
	} else
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		ap->rval = ap->firstblock;

	xfs_bmap_adjacent(ap);

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	/*
	 * If allowed, use ap->rval; otherwise must use firstblock since
	 * it's in the right allocation group.
	 */
2700
	if (nullfb || XFS_FSB_TO_AGNO(mp, ap->rval) == fb_agno)
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		;
	else
		ap->rval = ap->firstblock;
	/*
2705
	 * Normal allocation, done through xfs_alloc_vextent.
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	 */
2707 2708 2709 2710 2711
	tryagain = isaligned = 0;
	args.tp = ap->tp;
	args.mp = mp;
	args.fsbno = ap->rval;
	args.maxlen = MIN(ap->alen, mp->m_sb.sb_agblocks);
2712
	args.firstblock = ap->firstblock;
2713 2714
	blen = 0;
	if (nullfb) {
2715 2716 2717 2718
		if (ap->userdata && xfs_inode_is_filestream(ap->ip))
			args.type = XFS_ALLOCTYPE_NEAR_BNO;
		else
			args.type = XFS_ALLOCTYPE_START_BNO;
2719
		args.total = ap->total;
2720

2721
		/*
2722 2723 2724 2725 2726
		 * Search for an allocation group with a single extent
		 * large enough for the request.
		 *
		 * If one isn't found, then adjust the minimum allocation
		 * size to the largest space found.
2727 2728
		 */
		startag = ag = XFS_FSB_TO_AGNO(mp, args.fsbno);
2729 2730
		if (startag == NULLAGNUMBER)
			startag = ag = 0;
2731 2732 2733 2734 2735 2736 2737 2738 2739 2740
		notinit = 0;
		down_read(&mp->m_peraglock);
		while (blen < ap->alen) {
			pag = &mp->m_perag[ag];
			if (!pag->pagf_init &&
			    (error = xfs_alloc_pagf_init(mp, args.tp,
				    ag, XFS_ALLOC_FLAG_TRYLOCK))) {
				up_read(&mp->m_peraglock);
				return error;
			}
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			/*
2742
			 * See xfs_alloc_fix_freelist...
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			 */
2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755
			if (pag->pagf_init) {
				need = XFS_MIN_FREELIST_PAG(pag, mp);
				delta = need > pag->pagf_flcount ?
					need - pag->pagf_flcount : 0;
				longest = (pag->pagf_longest > delta) ?
					(pag->pagf_longest - delta) :
					(pag->pagf_flcount > 0 ||
					 pag->pagf_longest > 0);
				if (blen < longest)
					blen = longest;
			} else
				notinit = 1;
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			if (xfs_inode_is_filestream(ap->ip)) {
				if (blen >= ap->alen)
					break;

				if (ap->userdata) {
					/*
					 * If startag is an invalid AG, we've
					 * come here once before and
					 * xfs_filestream_new_ag picked the
					 * best currently available.
					 *
					 * Don't continue looping, since we
					 * could loop forever.
					 */
					if (startag == NULLAGNUMBER)
						break;

					error = xfs_filestream_new_ag(ap, &ag);
					if (error) {
						up_read(&mp->m_peraglock);
						return error;
					}

					/* loop again to set 'blen'*/
					startag = NULLAGNUMBER;
					continue;
				}
			}
2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808
			if (++ag == mp->m_sb.sb_agcount)
				ag = 0;
			if (ag == startag)
				break;
		}
		up_read(&mp->m_peraglock);
		/*
		 * Since the above loop did a BUF_TRYLOCK, it is
		 * possible that there is space for this request.
		 */
		if (notinit || blen < ap->minlen)
			args.minlen = ap->minlen;
		/*
		 * If the best seen length is less than the request
		 * length, use the best as the minimum.
		 */
		else if (blen < ap->alen)
			args.minlen = blen;
		/*
		 * Otherwise we've seen an extent as big as alen,
		 * use that as the minimum.
		 */
		else
			args.minlen = ap->alen;
2809 2810 2811 2812 2813 2814 2815

		/*
		 * set the failure fallback case to look in the selected
		 * AG as the stream may have moved.
		 */
		if (xfs_inode_is_filestream(ap->ip))
			ap->rval = args.fsbno = XFS_AGB_TO_FSB(mp, ag, 0);
2816
	} else if (ap->low) {
2817 2818 2819 2820
		if (xfs_inode_is_filestream(ap->ip))
			args.type = XFS_ALLOCTYPE_FIRST_AG;
		else
			args.type = XFS_ALLOCTYPE_START_BNO;
2821 2822 2823 2824 2825 2826
		args.total = args.minlen = ap->minlen;
	} else {
		args.type = XFS_ALLOCTYPE_NEAR_BNO;
		args.total = ap->total;
		args.minlen = ap->minlen;
	}
2827 2828 2829
	/* apply extent size hints if obtained earlier */
	if (unlikely(align)) {
		args.prod = align;
2830 2831
		if ((args.mod = (xfs_extlen_t)do_mod(ap->off, args.prod)))
			args.mod = (xfs_extlen_t)(args.prod - args.mod);
2832
	} else if (mp->m_sb.sb_blocksize >= NBPP) {
2833 2834 2835 2836 2837 2838
		args.prod = 1;
		args.mod = 0;
	} else {
		args.prod = NBPP >> mp->m_sb.sb_blocklog;
		if ((args.mod = (xfs_extlen_t)(do_mod(ap->off, args.prod))))
			args.mod = (xfs_extlen_t)(args.prod - args.mod);
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	}
	/*
2841 2842 2843 2844 2845 2846 2847
	 * If we are not low on available data blocks, and the
	 * underlying logical volume manager is a stripe, and
	 * the file offset is zero then try to allocate data
	 * blocks on stripe unit boundary.
	 * NOTE: ap->aeof is only set if the allocation length
	 * is >= the stripe unit and the allocation offset is
	 * at the end of file.
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	 */
2849 2850 2851 2852 2853
	if (!ap->low && ap->aeof) {
		if (!ap->off) {
			args.alignment = mp->m_dalign;
			atype = args.type;
			isaligned = 1;
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			/*
2855
			 * Adjust for alignment
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			 */
2857 2858 2859 2860
			if (blen > args.alignment && blen <= ap->alen)
				args.minlen = blen - args.alignment;
			args.minalignslop = 0;
		} else {
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			/*
2862 2863 2864
			 * First try an exact bno allocation.
			 * If it fails then do a near or start bno
			 * allocation with alignment turned on.
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			 */
2866 2867 2868 2869
			atype = args.type;
			tryagain = 1;
			args.type = XFS_ALLOCTYPE_THIS_BNO;
			args.alignment = 1;
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			/*
2871 2872 2873 2874
			 * Compute the minlen+alignment for the
			 * next case.  Set slop so that the value
			 * of minlen+alignment+slop doesn't go up
			 * between the calls.
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			 */
2876 2877
			if (blen > mp->m_dalign && blen <= ap->alen)
				nextminlen = blen - mp->m_dalign;
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			else
2879 2880 2881 2882 2883 2884 2885
				nextminlen = args.minlen;
			if (nextminlen + mp->m_dalign > args.minlen + 1)
				args.minalignslop =
					nextminlen + mp->m_dalign -
					args.minlen - 1;
			else
				args.minalignslop = 0;
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		}
2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897
	} else {
		args.alignment = 1;
		args.minalignslop = 0;
	}
	args.minleft = ap->minleft;
	args.wasdel = ap->wasdel;
	args.isfl = 0;
	args.userdata = ap->userdata;
	if ((error = xfs_alloc_vextent(&args)))
		return error;
	if (tryagain && args.fsbno == NULLFSBLOCK) {
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		/*
2899 2900
		 * Exact allocation failed. Now try with alignment
		 * turned on.
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		 */
2902 2903 2904 2905 2906 2907
		args.type = atype;
		args.fsbno = ap->rval;
		args.alignment = mp->m_dalign;
		args.minlen = nextminlen;
		args.minalignslop = 0;
		isaligned = 1;
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		if ((error = xfs_alloc_vextent(&args)))
			return error;
2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958
	}
	if (isaligned && args.fsbno == NULLFSBLOCK) {
		/*
		 * allocation failed, so turn off alignment and
		 * try again.
		 */
		args.type = atype;
		args.fsbno = ap->rval;
		args.alignment = 0;
		if ((error = xfs_alloc_vextent(&args)))
			return error;
	}
	if (args.fsbno == NULLFSBLOCK && nullfb &&
	    args.minlen > ap->minlen) {
		args.minlen = ap->minlen;
		args.type = XFS_ALLOCTYPE_START_BNO;
		args.fsbno = ap->rval;
		if ((error = xfs_alloc_vextent(&args)))
			return error;
	}
	if (args.fsbno == NULLFSBLOCK && nullfb) {
		args.fsbno = 0;
		args.type = XFS_ALLOCTYPE_FIRST_AG;
		args.total = ap->minlen;
		args.minleft = 0;
		if ((error = xfs_alloc_vextent(&args)))
			return error;
		ap->low = 1;
	}
	if (args.fsbno != NULLFSBLOCK) {
		ap->firstblock = ap->rval = args.fsbno;
		ASSERT(nullfb || fb_agno == args.agno ||
		       (ap->low && fb_agno < args.agno));
		ap->alen = args.len;
		ap->ip->i_d.di_nblocks += args.len;
		xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
		if (ap->wasdel)
			ap->ip->i_delayed_blks -= args.len;
		/*
		 * Adjust the disk quota also. This was reserved
		 * earlier.
		 */
		XFS_TRANS_MOD_DQUOT_BYINO(mp, ap->tp, ap->ip,
			ap->wasdel ? XFS_TRANS_DQ_DELBCOUNT :
					XFS_TRANS_DQ_BCOUNT,
			(long) args.len);
	} else {
		ap->rval = NULLFSBLOCK;
		ap->alen = 0;
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	}
	return 0;
2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973
}

/*
 * xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file.
 * It figures out where to ask the underlying allocator to put the new extent.
 */
STATIC int
xfs_bmap_alloc(
	xfs_bmalloca_t	*ap)		/* bmap alloc argument struct */
{
	if ((ap->ip->i_d.di_flags & XFS_DIFLAG_REALTIME) && ap->userdata)
		return xfs_bmap_rtalloc(ap);
	return xfs_bmap_btalloc(ap);
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}

/*
 * Transform a btree format file with only one leaf node, where the
 * extents list will fit in the inode, into an extents format file.
2979
 * Since the file extents are already in-core, all we have to do is
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 * give up the space for the btree root and pitch the leaf block.
 */
STATIC int				/* error */
xfs_bmap_btree_to_extents(
	xfs_trans_t		*tp,	/* transaction pointer */
	xfs_inode_t		*ip,	/* incore inode pointer */
	xfs_btree_cur_t		*cur,	/* btree cursor */
	int			*logflagsp, /* inode logging flags */
	int			whichfork)  /* data or attr fork */
{
	/* REFERENCED */
	xfs_bmbt_block_t	*cblock;/* child btree block */
	xfs_fsblock_t		cbno;	/* child block number */
	xfs_buf_t		*cbp;	/* child block's buffer */
	int			error;	/* error return value */
	xfs_ifork_t		*ifp;	/* inode fork data */
	xfs_mount_t		*mp;	/* mount point structure */
2997
	__be64			*pp;	/* ptr to block address */
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	xfs_bmbt_block_t	*rblock;/* root btree block */

	ifp = XFS_IFORK_PTR(ip, whichfork);
	ASSERT(ifp->if_flags & XFS_IFEXTENTS);
	ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE);
	rblock = ifp->if_broot;
3004 3005
	ASSERT(be16_to_cpu(rblock->bb_level) == 1);
	ASSERT(be16_to_cpu(rblock->bb_numrecs) == 1);
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	ASSERT(XFS_BMAP_BROOT_MAXRECS(ifp->if_broot_bytes) == 1);
	mp = ip->i_mount;
	pp = XFS_BMAP_BROOT_PTR_ADDR(rblock, 1, ifp->if_broot_bytes);
3009
	cbno = be64_to_cpu(*pp);
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	*logflagsp = 0;
#ifdef DEBUG
3012
	if ((error = xfs_btree_check_lptr(cur, cbno, 1)))
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3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035
		return error;
#endif
	if ((error = xfs_btree_read_bufl(mp, tp, cbno, 0, &cbp,
			XFS_BMAP_BTREE_REF)))
		return error;
	cblock = XFS_BUF_TO_BMBT_BLOCK(cbp);
	if ((error = xfs_btree_check_lblock(cur, cblock, 0, cbp)))
		return error;
	xfs_bmap_add_free(cbno, 1, cur->bc_private.b.flist, mp);
	ip->i_d.di_nblocks--;
	XFS_TRANS_MOD_DQUOT_BYINO(mp, tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
	xfs_trans_binval(tp, cbp);
	if (cur->bc_bufs[0] == cbp)
		cur->bc_bufs[0] = NULL;
	xfs_iroot_realloc(ip, -1, whichfork);
	ASSERT(ifp->if_broot == NULL);
	ASSERT((ifp->if_flags & XFS_IFBROOT) == 0);
	XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS);
	*logflagsp = XFS_ILOG_CORE | XFS_ILOG_FEXT(whichfork);
	return 0;
}

/*
3036
 * Called by xfs_bmapi to update file extent records and the btree
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3037 3038 3039 3040 3041 3042 3043 3044 3045
 * after removing space (or undoing a delayed allocation).
 */
STATIC int				/* error */
xfs_bmap_del_extent(
	xfs_inode_t		*ip,	/* incore inode pointer */
	xfs_trans_t		*tp,	/* current transaction pointer */
	xfs_extnum_t		idx,	/* extent number to update/delete */
	xfs_bmap_free_t		*flist,	/* list of extents to be freed */
	xfs_btree_cur_t		*cur,	/* if null, not a btree */
3046
	xfs_bmbt_irec_t		*del,	/* data to remove from extents */
L
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3047
	int			*logflagsp, /* inode logging flags */
3048
	xfs_extdelta_t		*delta, /* Change made to incore extents */
L
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3049 3050 3051 3052 3053 3054 3055 3056 3057
	int			whichfork, /* data or attr fork */
	int			rsvd)	/* OK to allocate reserved blocks */
{
	xfs_filblks_t		da_new;	/* new delay-alloc indirect blocks */
	xfs_filblks_t		da_old;	/* old delay-alloc indirect blocks */
	xfs_fsblock_t		del_endblock=0;	/* first block past del */
	xfs_fileoff_t		del_endoff;	/* first offset past del */
	int			delay;	/* current block is delayed allocated */
	int			do_fx;	/* free extent at end of routine */
3058
	xfs_bmbt_rec_host_t	*ep;	/* current extent entry pointer */
L
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3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075
	int			error;	/* error return value */
	int			flags;	/* inode logging flags */
	xfs_bmbt_irec_t		got;	/* current extent entry */
	xfs_fileoff_t		got_endoff;	/* first offset past got */
	int			i;	/* temp state */
	xfs_ifork_t		*ifp;	/* inode fork pointer */
	xfs_mount_t		*mp;	/* mount structure */
	xfs_filblks_t		nblks;	/* quota/sb block count */
	xfs_bmbt_irec_t		new;	/* new record to be inserted */
	/* REFERENCED */
	uint			qfield;	/* quota field to update */
	xfs_filblks_t		temp;	/* for indirect length calculations */
	xfs_filblks_t		temp2;	/* for indirect length calculations */

	XFS_STATS_INC(xs_del_exlist);
	mp = ip->i_mount;
	ifp = XFS_IFORK_PTR(ip, whichfork);
3076 3077
	ASSERT((idx >= 0) && (idx < ifp->if_bytes /
		(uint)sizeof(xfs_bmbt_rec_t)));
L
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3078
	ASSERT(del->br_blockcount > 0);
3079
	ep = xfs_iext_get_ext(ifp, idx);
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3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153
	xfs_bmbt_get_all(ep, &got);
	ASSERT(got.br_startoff <= del->br_startoff);
	del_endoff = del->br_startoff + del->br_blockcount;
	got_endoff = got.br_startoff + got.br_blockcount;
	ASSERT(got_endoff >= del_endoff);
	delay = ISNULLSTARTBLOCK(got.br_startblock);
	ASSERT(ISNULLSTARTBLOCK(del->br_startblock) == delay);
	flags = 0;
	qfield = 0;
	error = 0;
	/*
	 * If deleting a real allocation, must free up the disk space.
	 */
	if (!delay) {
		flags = XFS_ILOG_CORE;
		/*
		 * Realtime allocation.  Free it and record di_nblocks update.
		 */
		if (whichfork == XFS_DATA_FORK &&
		    (ip->i_d.di_flags & XFS_DIFLAG_REALTIME)) {
			xfs_fsblock_t	bno;
			xfs_filblks_t	len;

			ASSERT(do_mod(del->br_blockcount,
				      mp->m_sb.sb_rextsize) == 0);
			ASSERT(do_mod(del->br_startblock,
				      mp->m_sb.sb_rextsize) == 0);
			bno = del->br_startblock;
			len = del->br_blockcount;
			do_div(bno, mp->m_sb.sb_rextsize);
			do_div(len, mp->m_sb.sb_rextsize);
			if ((error = xfs_rtfree_extent(ip->i_transp, bno,
					(xfs_extlen_t)len)))
				goto done;
			do_fx = 0;
			nblks = len * mp->m_sb.sb_rextsize;
			qfield = XFS_TRANS_DQ_RTBCOUNT;
		}
		/*
		 * Ordinary allocation.
		 */
		else {
			do_fx = 1;
			nblks = del->br_blockcount;
			qfield = XFS_TRANS_DQ_BCOUNT;
		}
		/*
		 * Set up del_endblock and cur for later.
		 */
		del_endblock = del->br_startblock + del->br_blockcount;
		if (cur) {
			if ((error = xfs_bmbt_lookup_eq(cur, got.br_startoff,
					got.br_startblock, got.br_blockcount,
					&i)))
				goto done;
			ASSERT(i == 1);
		}
		da_old = da_new = 0;
	} else {
		da_old = STARTBLOCKVAL(got.br_startblock);
		da_new = 0;
		nblks = 0;
		do_fx = 0;
	}
	/*
	 * Set flag value to use in switch statement.
	 * Left-contig is 2, right-contig is 1.
	 */
	switch (((got.br_startoff == del->br_startoff) << 1) |
		(got_endoff == del_endoff)) {
	case 3:
		/*
		 * Matches the whole extent.  Delete the entry.
		 */
3154
		XFS_BMAP_TRACE_DELETE("3", ip, idx, 1, whichfork);
3155
		xfs_iext_remove(ifp, idx, 1);
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Linus Torvalds 已提交
3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174
		ifp->if_lastex = idx;
		if (delay)
			break;
		XFS_IFORK_NEXT_SET(ip, whichfork,
			XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
		flags |= XFS_ILOG_CORE;
		if (!cur) {
			flags |= XFS_ILOG_FEXT(whichfork);
			break;
		}
		if ((error = xfs_bmbt_delete(cur, &i)))
			goto done;
		ASSERT(i == 1);
		break;

	case 2:
		/*
		 * Deleting the first part of the extent.
		 */
3175
		XFS_BMAP_TRACE_PRE_UPDATE("2", ip, idx, whichfork);
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3176 3177 3178 3179 3180 3181 3182 3183
		xfs_bmbt_set_startoff(ep, del_endoff);
		temp = got.br_blockcount - del->br_blockcount;
		xfs_bmbt_set_blockcount(ep, temp);
		ifp->if_lastex = idx;
		if (delay) {
			temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
				da_old);
			xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
3184
			XFS_BMAP_TRACE_POST_UPDATE("2", ip, idx,
L
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3185 3186 3187 3188 3189
				whichfork);
			da_new = temp;
			break;
		}
		xfs_bmbt_set_startblock(ep, del_endblock);
3190
		XFS_BMAP_TRACE_POST_UPDATE("2", ip, idx, whichfork);
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3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205
		if (!cur) {
			flags |= XFS_ILOG_FEXT(whichfork);
			break;
		}
		if ((error = xfs_bmbt_update(cur, del_endoff, del_endblock,
				got.br_blockcount - del->br_blockcount,
				got.br_state)))
			goto done;
		break;

	case 1:
		/*
		 * Deleting the last part of the extent.
		 */
		temp = got.br_blockcount - del->br_blockcount;
3206
		XFS_BMAP_TRACE_PRE_UPDATE("1", ip, idx, whichfork);
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3207 3208 3209 3210 3211 3212
		xfs_bmbt_set_blockcount(ep, temp);
		ifp->if_lastex = idx;
		if (delay) {
			temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
				da_old);
			xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
3213
			XFS_BMAP_TRACE_POST_UPDATE("1", ip, idx,
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3214 3215 3216 3217
				whichfork);
			da_new = temp;
			break;
		}
3218
		XFS_BMAP_TRACE_POST_UPDATE("1", ip, idx, whichfork);
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3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234
		if (!cur) {
			flags |= XFS_ILOG_FEXT(whichfork);
			break;
		}
		if ((error = xfs_bmbt_update(cur, got.br_startoff,
				got.br_startblock,
				got.br_blockcount - del->br_blockcount,
				got.br_state)))
			goto done;
		break;

	case 0:
		/*
		 * Deleting the middle of the extent.
		 */
		temp = del->br_startoff - got.br_startoff;
3235
		XFS_BMAP_TRACE_PRE_UPDATE("0", ip, idx, whichfork);
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3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321
		xfs_bmbt_set_blockcount(ep, temp);
		new.br_startoff = del_endoff;
		temp2 = got_endoff - del_endoff;
		new.br_blockcount = temp2;
		new.br_state = got.br_state;
		if (!delay) {
			new.br_startblock = del_endblock;
			flags |= XFS_ILOG_CORE;
			if (cur) {
				if ((error = xfs_bmbt_update(cur,
						got.br_startoff,
						got.br_startblock, temp,
						got.br_state)))
					goto done;
				if ((error = xfs_bmbt_increment(cur, 0, &i)))
					goto done;
				cur->bc_rec.b = new;
				error = xfs_bmbt_insert(cur, &i);
				if (error && error != ENOSPC)
					goto done;
				/*
				 * If get no-space back from btree insert,
				 * it tried a split, and we have a zero
				 * block reservation.
				 * Fix up our state and return the error.
				 */
				if (error == ENOSPC) {
					/*
					 * Reset the cursor, don't trust
					 * it after any insert operation.
					 */
					if ((error = xfs_bmbt_lookup_eq(cur,
							got.br_startoff,
							got.br_startblock,
							temp, &i)))
						goto done;
					ASSERT(i == 1);
					/*
					 * Update the btree record back
					 * to the original value.
					 */
					if ((error = xfs_bmbt_update(cur,
							got.br_startoff,
							got.br_startblock,
							got.br_blockcount,
							got.br_state)))
						goto done;
					/*
					 * Reset the extent record back
					 * to the original value.
					 */
					xfs_bmbt_set_blockcount(ep,
						got.br_blockcount);
					flags = 0;
					error = XFS_ERROR(ENOSPC);
					goto done;
				}
				ASSERT(i == 1);
			} else
				flags |= XFS_ILOG_FEXT(whichfork);
			XFS_IFORK_NEXT_SET(ip, whichfork,
				XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
		} else {
			ASSERT(whichfork == XFS_DATA_FORK);
			temp = xfs_bmap_worst_indlen(ip, temp);
			xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
			temp2 = xfs_bmap_worst_indlen(ip, temp2);
			new.br_startblock = NULLSTARTBLOCK((int)temp2);
			da_new = temp + temp2;
			while (da_new > da_old) {
				if (temp) {
					temp--;
					da_new--;
					xfs_bmbt_set_startblock(ep,
						NULLSTARTBLOCK((int)temp));
				}
				if (da_new == da_old)
					break;
				if (temp2) {
					temp2--;
					da_new--;
					new.br_startblock =
						NULLSTARTBLOCK((int)temp2);
				}
			}
		}
3322 3323
		XFS_BMAP_TRACE_POST_UPDATE("0", ip, idx, whichfork);
		XFS_BMAP_TRACE_INSERT("0", ip, idx + 1, 1, &new, NULL,
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			whichfork);
3325
		xfs_iext_insert(ifp, idx + 1, 1, &new);
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		ifp->if_lastex = idx + 1;
		break;
	}
	/*
	 * If we need to, add to list of extents to delete.
	 */
	if (do_fx)
		xfs_bmap_add_free(del->br_startblock, del->br_blockcount, flist,
			mp);
	/*
	 * Adjust inode # blocks in the file.
	 */
	if (nblks)
		ip->i_d.di_nblocks -= nblks;
	/*
	 * Adjust quota data.
	 */
	if (qfield)
		XFS_TRANS_MOD_DQUOT_BYINO(mp, tp, ip, qfield, (long)-nblks);

	/*
	 * Account for change in delayed indirect blocks.
	 * Nothing to do for disk quota accounting here.
	 */
	ASSERT(da_old >= da_new);
	if (da_old > da_new)
3352
		xfs_mod_incore_sb(mp, XFS_SBS_FDBLOCKS, (int64_t)(da_old - da_new),
L
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3353
			rsvd);
3354 3355 3356 3357 3358 3359 3360 3361
	if (delta) {
		/* DELTA: report the original extent. */
		if (delta->xed_startoff > got.br_startoff)
			delta->xed_startoff = got.br_startoff;
		if (delta->xed_blockcount < got.br_startoff+got.br_blockcount)
			delta->xed_blockcount = got.br_startoff +
							got.br_blockcount;
	}
L
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done:
	*logflagsp = flags;
	return error;
}

/*
 * Remove the entry "free" from the free item list.  Prev points to the
 * previous entry, unless "free" is the head of the list.
 */
STATIC void
xfs_bmap_del_free(
	xfs_bmap_free_t		*flist,	/* free item list header */
	xfs_bmap_free_item_t	*prev,	/* previous item on list, if any */
	xfs_bmap_free_item_t	*free)	/* list item to be freed */
{
	if (prev)
		prev->xbfi_next = free->xbfi_next;
	else
		flist->xbf_first = free->xbfi_next;
	flist->xbf_count--;
	kmem_zone_free(xfs_bmap_free_item_zone, free);
}

/*
 * Convert an extents-format file into a btree-format file.
 * The new file will have a root block (in the inode) and a single child block.
 */
STATIC int					/* error */
xfs_bmap_extents_to_btree(
	xfs_trans_t		*tp,		/* transaction pointer */
	xfs_inode_t		*ip,		/* incore inode pointer */
	xfs_fsblock_t		*firstblock,	/* first-block-allocated */
	xfs_bmap_free_t		*flist,		/* blocks freed in xaction */
	xfs_btree_cur_t		**curp,		/* cursor returned to caller */
	int			wasdel,		/* converting a delayed alloc */
	int			*logflagsp,	/* inode logging flags */
	int			whichfork)	/* data or attr fork */
{
	xfs_bmbt_block_t	*ablock;	/* allocated (child) bt block */
	xfs_buf_t		*abp;		/* buffer for ablock */
	xfs_alloc_arg_t		args;		/* allocation arguments */
	xfs_bmbt_rec_t		*arp;		/* child record pointer */
	xfs_bmbt_block_t	*block;		/* btree root block */
	xfs_btree_cur_t		*cur;		/* bmap btree cursor */
3406
	xfs_bmbt_rec_host_t	*ep;		/* extent record pointer */
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	int			error;		/* error return value */
3408
	xfs_extnum_t		i, cnt;		/* extent record index */
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	xfs_ifork_t		*ifp;		/* inode fork pointer */
	xfs_bmbt_key_t		*kp;		/* root block key pointer */
	xfs_mount_t		*mp;		/* mount structure */
3412
	xfs_extnum_t		nextents;	/* number of file extents */
L
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	xfs_bmbt_ptr_t		*pp;		/* root block address pointer */

	ifp = XFS_IFORK_PTR(ip, whichfork);
	ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS);
	ASSERT(ifp->if_ext_max ==
	       XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
	/*
	 * Make space in the inode incore.
	 */
	xfs_iroot_realloc(ip, 1, whichfork);
	ifp->if_flags |= XFS_IFBROOT;
	/*
	 * Fill in the root.
	 */
	block = ifp->if_broot;
3428 3429 3430 3431 3432
	block->bb_magic = cpu_to_be32(XFS_BMAP_MAGIC);
	block->bb_level = cpu_to_be16(1);
	block->bb_numrecs = cpu_to_be16(1);
	block->bb_leftsib = cpu_to_be64(NULLDFSBNO);
	block->bb_rightsib = cpu_to_be64(NULLDFSBNO);
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	/*
	 * Need a cursor.  Can't allocate until bb_level is filled in.
	 */
	mp = ip->i_mount;
	cur = xfs_btree_init_cursor(mp, tp, NULL, 0, XFS_BTNUM_BMAP, ip,
		whichfork);
	cur->bc_private.b.firstblock = *firstblock;
	cur->bc_private.b.flist = flist;
	cur->bc_private.b.flags = wasdel ? XFS_BTCUR_BPRV_WASDEL : 0;
	/*
	 * Convert to a btree with two levels, one record in root.
	 */
	XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_BTREE);
	args.tp = tp;
	args.mp = mp;
3448
	args.firstblock = *firstblock;
L
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3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459 3460 3461 3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474 3475 3476 3477 3478 3479 3480 3481 3482 3483 3484 3485
	if (*firstblock == NULLFSBLOCK) {
		args.type = XFS_ALLOCTYPE_START_BNO;
		args.fsbno = XFS_INO_TO_FSB(mp, ip->i_ino);
	} else if (flist->xbf_low) {
		args.type = XFS_ALLOCTYPE_START_BNO;
		args.fsbno = *firstblock;
	} else {
		args.type = XFS_ALLOCTYPE_NEAR_BNO;
		args.fsbno = *firstblock;
	}
	args.minlen = args.maxlen = args.prod = 1;
	args.total = args.minleft = args.alignment = args.mod = args.isfl =
		args.minalignslop = 0;
	args.wasdel = wasdel;
	*logflagsp = 0;
	if ((error = xfs_alloc_vextent(&args))) {
		xfs_iroot_realloc(ip, -1, whichfork);
		xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
		return error;
	}
	/*
	 * Allocation can't fail, the space was reserved.
	 */
	ASSERT(args.fsbno != NULLFSBLOCK);
	ASSERT(*firstblock == NULLFSBLOCK ||
	       args.agno == XFS_FSB_TO_AGNO(mp, *firstblock) ||
	       (flist->xbf_low &&
		args.agno > XFS_FSB_TO_AGNO(mp, *firstblock)));
	*firstblock = cur->bc_private.b.firstblock = args.fsbno;
	cur->bc_private.b.allocated++;
	ip->i_d.di_nblocks++;
	XFS_TRANS_MOD_DQUOT_BYINO(mp, tp, ip, XFS_TRANS_DQ_BCOUNT, 1L);
	abp = xfs_btree_get_bufl(mp, tp, args.fsbno, 0);
	/*
	 * Fill in the child block.
	 */
	ablock = XFS_BUF_TO_BMBT_BLOCK(abp);
3486
	ablock->bb_magic = cpu_to_be32(XFS_BMAP_MAGIC);
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3487
	ablock->bb_level = 0;
3488 3489
	ablock->bb_leftsib = cpu_to_be64(NULLDFSBNO);
	ablock->bb_rightsib = cpu_to_be64(NULLDFSBNO);
L
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3490 3491
	arp = XFS_BMAP_REC_IADDR(ablock, 1, cur);
	nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
3492 3493
	for (cnt = i = 0; i < nextents; i++) {
		ep = xfs_iext_get_ext(ifp, i);
L
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3494
		if (!ISNULLSTARTBLOCK(xfs_bmbt_get_startblock(ep))) {
3495 3496
			arp->l0 = cpu_to_be64(ep->l0);
			arp->l1 = cpu_to_be64(ep->l1);
L
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3497 3498 3499
			arp++; cnt++;
		}
	}
3500 3501
	ASSERT(cnt == XFS_IFORK_NEXTENTS(ip, whichfork));
	ablock->bb_numrecs = cpu_to_be16(cnt);
L
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3502 3503 3504 3505 3506
	/*
	 * Fill in the root key and pointer.
	 */
	kp = XFS_BMAP_KEY_IADDR(block, 1, cur);
	arp = XFS_BMAP_REC_IADDR(ablock, 1, cur);
3507
	kp->br_startoff = cpu_to_be64(xfs_bmbt_disk_get_startoff(arp));
L
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3508
	pp = XFS_BMAP_PTR_IADDR(block, 1, cur);
3509
	*pp = cpu_to_be64(args.fsbno);
L
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3510 3511 3512 3513 3514
	/*
	 * Do all this logging at the end so that
	 * the root is at the right level.
	 */
	xfs_bmbt_log_block(cur, abp, XFS_BB_ALL_BITS);
3515
	xfs_bmbt_log_recs(cur, abp, 1, be16_to_cpu(ablock->bb_numrecs));
L
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3516 3517 3518 3519 3520 3521
	ASSERT(*curp == NULL);
	*curp = cur;
	*logflagsp = XFS_ILOG_CORE | XFS_ILOG_FBROOT(whichfork);
	return 0;
}

3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533 3534 3535
/*
 * Helper routine to reset inode di_forkoff field when switching
 * attribute fork from local to extent format - we reset it where
 * possible to make space available for inline data fork extents.
 */
STATIC void
xfs_bmap_forkoff_reset(
	xfs_mount_t	*mp,
	xfs_inode_t	*ip,
	int		whichfork)
{
	if (whichfork == XFS_ATTR_FORK &&
	    (ip->i_d.di_format != XFS_DINODE_FMT_DEV) &&
	    (ip->i_d.di_format != XFS_DINODE_FMT_UUID) &&
3536
	    (ip->i_d.di_format != XFS_DINODE_FMT_BTREE) &&
3537 3538 3539 3540 3541 3542 3543 3544 3545
	    ((mp->m_attroffset >> 3) > ip->i_d.di_forkoff)) {
		ip->i_d.di_forkoff = mp->m_attroffset >> 3;
		ip->i_df.if_ext_max = XFS_IFORK_DSIZE(ip) /
					(uint)sizeof(xfs_bmbt_rec_t);
		ip->i_afp->if_ext_max = XFS_IFORK_ASIZE(ip) /
					(uint)sizeof(xfs_bmbt_rec_t);
	}
}

L
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3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576
/*
 * Convert a local file to an extents file.
 * This code is out of bounds for data forks of regular files,
 * since the file data needs to get logged so things will stay consistent.
 * (The bmap-level manipulations are ok, though).
 */
STATIC int				/* error */
xfs_bmap_local_to_extents(
	xfs_trans_t	*tp,		/* transaction pointer */
	xfs_inode_t	*ip,		/* incore inode pointer */
	xfs_fsblock_t	*firstblock,	/* first block allocated in xaction */
	xfs_extlen_t	total,		/* total blocks needed by transaction */
	int		*logflagsp,	/* inode logging flags */
	int		whichfork)	/* data or attr fork */
{
	int		error;		/* error return value */
	int		flags;		/* logging flags returned */
	xfs_ifork_t	*ifp;		/* inode fork pointer */

	/*
	 * We don't want to deal with the case of keeping inode data inline yet.
	 * So sending the data fork of a regular inode is invalid.
	 */
	ASSERT(!((ip->i_d.di_mode & S_IFMT) == S_IFREG &&
		 whichfork == XFS_DATA_FORK));
	ifp = XFS_IFORK_PTR(ip, whichfork);
	ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
	flags = 0;
	error = 0;
	if (ifp->if_bytes) {
		xfs_alloc_arg_t	args;	/* allocation arguments */
3577
		xfs_buf_t	*bp;	/* buffer for extent block */
3578
		xfs_bmbt_rec_host_t *ep;/* extent record pointer */
L
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3579 3580 3581

		args.tp = tp;
		args.mp = ip->i_mount;
3582
		args.firstblock = *firstblock;
3583 3584
		ASSERT((ifp->if_flags &
			(XFS_IFINLINE|XFS_IFEXTENTS|XFS_IFEXTIREC)) == XFS_IFINLINE);
L
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3585 3586 3587 3588 3589 3590 3591 3592 3593 3594 3595 3596 3597 3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 3611
		/*
		 * Allocate a block.  We know we need only one, since the
		 * file currently fits in an inode.
		 */
		if (*firstblock == NULLFSBLOCK) {
			args.fsbno = XFS_INO_TO_FSB(args.mp, ip->i_ino);
			args.type = XFS_ALLOCTYPE_START_BNO;
		} else {
			args.fsbno = *firstblock;
			args.type = XFS_ALLOCTYPE_NEAR_BNO;
		}
		args.total = total;
		args.mod = args.minleft = args.alignment = args.wasdel =
			args.isfl = args.minalignslop = 0;
		args.minlen = args.maxlen = args.prod = 1;
		if ((error = xfs_alloc_vextent(&args)))
			goto done;
		/*
		 * Can't fail, the space was reserved.
		 */
		ASSERT(args.fsbno != NULLFSBLOCK);
		ASSERT(args.len == 1);
		*firstblock = args.fsbno;
		bp = xfs_btree_get_bufl(args.mp, tp, args.fsbno, 0);
		memcpy((char *)XFS_BUF_PTR(bp), ifp->if_u1.if_data,
			ifp->if_bytes);
		xfs_trans_log_buf(tp, bp, 0, ifp->if_bytes - 1);
3612
		xfs_bmap_forkoff_reset(args.mp, ip, whichfork);
L
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3613
		xfs_idata_realloc(ip, -ifp->if_bytes, whichfork);
3614 3615
		xfs_iext_add(ifp, 0, 1);
		ep = xfs_iext_get_ext(ifp, 0);
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3616
		xfs_bmbt_set_allf(ep, 0, args.fsbno, 1, XFS_EXT_NORM);
3617
		XFS_BMAP_TRACE_POST_UPDATE("new", ip, 0, whichfork);
L
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3618 3619 3620 3621 3622
		XFS_IFORK_NEXT_SET(ip, whichfork, 1);
		ip->i_d.di_nblocks = 1;
		XFS_TRANS_MOD_DQUOT_BYINO(args.mp, tp, ip,
			XFS_TRANS_DQ_BCOUNT, 1L);
		flags |= XFS_ILOG_FEXT(whichfork);
3623
	} else {
L
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		ASSERT(XFS_IFORK_NEXTENTS(ip, whichfork) == 0);
3625 3626
		xfs_bmap_forkoff_reset(ip->i_mount, ip, whichfork);
	}
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3627 3628 3629 3630 3631 3632 3633 3634 3635
	ifp->if_flags &= ~XFS_IFINLINE;
	ifp->if_flags |= XFS_IFEXTENTS;
	XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS);
	flags |= XFS_ILOG_CORE;
done:
	*logflagsp = flags;
	return error;
}

3636
/*
3637 3638 3639 3640 3641
 * Search the extent records for the entry containing block bno.
 * If bno lies in a hole, point to the next entry.  If bno lies
 * past eof, *eofp will be set, and *prevp will contain the last
 * entry (null if none).  Else, *lastxp will be set to the index
 * of the found entry; *gotp will contain the entry.
3642
 */
3643
xfs_bmbt_rec_host_t *			/* pointer to found extent entry */
3644 3645 3646 3647 3648 3649 3650 3651
xfs_bmap_search_multi_extents(
	xfs_ifork_t	*ifp,		/* inode fork pointer */
	xfs_fileoff_t	bno,		/* block number searched for */
	int		*eofp,		/* out: end of file found */
	xfs_extnum_t	*lastxp,	/* out: last extent index */
	xfs_bmbt_irec_t	*gotp,		/* out: extent entry found */
	xfs_bmbt_irec_t	*prevp)		/* out: previous extent entry found */
{
3652
	xfs_bmbt_rec_host_t *ep;		/* extent record pointer */
3653 3654 3655
	xfs_extnum_t	lastx;		/* last extent index */

	/*
3656 3657
	 * Initialize the extent entry structure to catch access to
	 * uninitialized br_startblock field.
3658
	 */
3659 3660 3661 3662 3663 3664 3665 3666 3667 3668 3669 3670 3671
	gotp->br_startoff = 0xffa5a5a5a5a5a5a5LL;
	gotp->br_blockcount = 0xa55a5a5a5a5a5a5aLL;
	gotp->br_state = XFS_EXT_INVALID;
#if XFS_BIG_BLKNOS
	gotp->br_startblock = 0xffffa5a5a5a5a5a5LL;
#else
	gotp->br_startblock = 0xffffa5a5;
#endif
	prevp->br_startoff = NULLFILEOFF;

	ep = xfs_iext_bno_to_ext(ifp, bno, &lastx);
	if (lastx > 0) {
		xfs_bmbt_get_all(xfs_iext_get_ext(ifp, lastx - 1), prevp);
3672
	}
3673 3674 3675 3676 3677 3678 3679 3680 3681
	if (lastx < (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t))) {
		xfs_bmbt_get_all(ep, gotp);
		*eofp = 0;
	} else {
		if (lastx > 0) {
			*gotp = *prevp;
		}
		*eofp = 1;
		ep = NULL;
3682
	}
3683
	*lastxp = lastx;
3684 3685 3686
	return ep;
}

L
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3687 3688 3689 3690 3691 3692 3693
/*
 * Search the extents list for the inode, for the extent containing bno.
 * If bno lies in a hole, point to the next entry.  If bno lies past eof,
 * *eofp will be set, and *prevp will contain the last entry (null if none).
 * Else, *lastxp will be set to the index of the found
 * entry; *gotp will contain the entry.
 */
3694
STATIC xfs_bmbt_rec_host_t *                 /* pointer to found extent entry */
L
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3695 3696 3697
xfs_bmap_search_extents(
	xfs_inode_t     *ip,            /* incore inode pointer */
	xfs_fileoff_t   bno,            /* block number searched for */
3698
	int             fork,      	/* data or attr fork */
L
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3699 3700 3701 3702 3703 3704
	int             *eofp,          /* out: end of file found */
	xfs_extnum_t    *lastxp,        /* out: last extent index */
	xfs_bmbt_irec_t *gotp,          /* out: extent entry found */
	xfs_bmbt_irec_t *prevp)         /* out: previous extent entry found */
{
	xfs_ifork_t	*ifp;		/* inode fork pointer */
3705
	xfs_bmbt_rec_host_t  *ep;            /* extent record pointer */
L
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3706 3707

	XFS_STATS_INC(xs_look_exlist);
3708
	ifp = XFS_IFORK_PTR(ip, fork);
L
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3709

3710 3711
	ep = xfs_bmap_search_multi_extents(ifp, bno, eofp, lastxp, gotp, prevp);

3712 3713 3714 3715 3716 3717 3718
	if (unlikely(!(gotp->br_startblock) && (*lastxp != NULLEXTNUM) &&
		     !(XFS_IS_REALTIME_INODE(ip) && fork == XFS_DATA_FORK))) {
		xfs_cmn_err(XFS_PTAG_FSBLOCK_ZERO, CE_ALERT, ip->i_mount,
				"Access to block zero in inode %llu "
				"start_block: %llx start_off: %llx "
				"blkcnt: %llx extent-state: %x lastx: %x\n",
			(unsigned long long)ip->i_ino,
3719 3720 3721
			(unsigned long long)gotp->br_startblock,
			(unsigned long long)gotp->br_startoff,
			(unsigned long long)gotp->br_blockcount,
3722 3723 3724 3725 3726 3727
			gotp->br_state, *lastxp);
		*lastxp = NULLEXTNUM;
		*eofp = 1;
		return NULL;
	}
	return ep;
L
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}


#ifdef XFS_BMAP_TRACE
ktrace_t	*xfs_bmap_trace_buf;

/*
 * Add a bmap trace buffer entry.  Base routine for the others.
 */
STATIC void
xfs_bmap_trace_addentry(
	int		opcode,		/* operation */
3740
	const char	*fname,		/* function name */
L
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	char		*desc,		/* operation description */
	xfs_inode_t	*ip,		/* incore inode pointer */
	xfs_extnum_t	idx,		/* index of entry(ies) */
	xfs_extnum_t	cnt,		/* count of entries, 1 or 2 */
3745 3746
	xfs_bmbt_rec_host_t *r1,	/* first record */
	xfs_bmbt_rec_host_t *r2,	/* second record or null */
L
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3747 3748
	int		whichfork)	/* data or attr fork */
{
3749
	xfs_bmbt_rec_host_t tr2;
L
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3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778 3779 3780 3781 3782 3783 3784 3785 3786 3787 3788 3789 3790 3791 3792 3793 3794

	ASSERT(cnt == 1 || cnt == 2);
	ASSERT(r1 != NULL);
	if (cnt == 1) {
		ASSERT(r2 == NULL);
		r2 = &tr2;
		memset(&tr2, 0, sizeof(tr2));
	} else
		ASSERT(r2 != NULL);
	ktrace_enter(xfs_bmap_trace_buf,
		(void *)(__psint_t)(opcode | (whichfork << 16)),
		(void *)fname, (void *)desc, (void *)ip,
		(void *)(__psint_t)idx,
		(void *)(__psint_t)cnt,
		(void *)(__psunsigned_t)(ip->i_ino >> 32),
		(void *)(__psunsigned_t)(unsigned)ip->i_ino,
		(void *)(__psunsigned_t)(r1->l0 >> 32),
		(void *)(__psunsigned_t)(unsigned)(r1->l0),
		(void *)(__psunsigned_t)(r1->l1 >> 32),
		(void *)(__psunsigned_t)(unsigned)(r1->l1),
		(void *)(__psunsigned_t)(r2->l0 >> 32),
		(void *)(__psunsigned_t)(unsigned)(r2->l0),
		(void *)(__psunsigned_t)(r2->l1 >> 32),
		(void *)(__psunsigned_t)(unsigned)(r2->l1)
		);
	ASSERT(ip->i_xtrace);
	ktrace_enter(ip->i_xtrace,
		(void *)(__psint_t)(opcode | (whichfork << 16)),
		(void *)fname, (void *)desc, (void *)ip,
		(void *)(__psint_t)idx,
		(void *)(__psint_t)cnt,
		(void *)(__psunsigned_t)(ip->i_ino >> 32),
		(void *)(__psunsigned_t)(unsigned)ip->i_ino,
		(void *)(__psunsigned_t)(r1->l0 >> 32),
		(void *)(__psunsigned_t)(unsigned)(r1->l0),
		(void *)(__psunsigned_t)(r1->l1 >> 32),
		(void *)(__psunsigned_t)(unsigned)(r1->l1),
		(void *)(__psunsigned_t)(r2->l0 >> 32),
		(void *)(__psunsigned_t)(unsigned)(r2->l0),
		(void *)(__psunsigned_t)(r2->l1 >> 32),
		(void *)(__psunsigned_t)(unsigned)(r2->l1)
		);
}

/*
3795
 * Add bmap trace entry prior to a call to xfs_iext_remove.
L
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3796 3797 3798
 */
STATIC void
xfs_bmap_trace_delete(
3799
	const char	*fname,		/* function name */
L
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3800 3801 3802 3803 3804 3805 3806 3807 3808 3809
	char		*desc,		/* operation description */
	xfs_inode_t	*ip,		/* incore inode pointer */
	xfs_extnum_t	idx,		/* index of entry(entries) deleted */
	xfs_extnum_t	cnt,		/* count of entries deleted, 1 or 2 */
	int		whichfork)	/* data or attr fork */
{
	xfs_ifork_t	*ifp;		/* inode fork pointer */

	ifp = XFS_IFORK_PTR(ip, whichfork);
	xfs_bmap_trace_addentry(XFS_BMAP_KTRACE_DELETE, fname, desc, ip, idx,
3810 3811
		cnt, xfs_iext_get_ext(ifp, idx),
		cnt == 2 ? xfs_iext_get_ext(ifp, idx + 1) : NULL,
L
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3812 3813 3814 3815
		whichfork);
}

/*
3816
 * Add bmap trace entry prior to a call to xfs_iext_insert, or
L
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3817 3818 3819 3820
 * reading in the extents list from the disk (in the btree).
 */
STATIC void
xfs_bmap_trace_insert(
3821
	const char	*fname,		/* function name */
L
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	char		*desc,		/* operation description */
	xfs_inode_t	*ip,		/* incore inode pointer */
	xfs_extnum_t	idx,		/* index of entry(entries) inserted */
	xfs_extnum_t	cnt,		/* count of entries inserted, 1 or 2 */
	xfs_bmbt_irec_t	*r1,		/* inserted record 1 */
	xfs_bmbt_irec_t	*r2,		/* inserted record 2 or null */
	int		whichfork)	/* data or attr fork */
{
3830 3831
	xfs_bmbt_rec_host_t tr1;	/* compressed record 1 */
	xfs_bmbt_rec_host_t tr2;	/* compressed record 2 if needed */
L
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3832 3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 3843 3844 3845

	xfs_bmbt_set_all(&tr1, r1);
	if (cnt == 2) {
		ASSERT(r2 != NULL);
		xfs_bmbt_set_all(&tr2, r2);
	} else {
		ASSERT(cnt == 1);
		ASSERT(r2 == NULL);
	}
	xfs_bmap_trace_addentry(XFS_BMAP_KTRACE_INSERT, fname, desc, ip, idx,
		cnt, &tr1, cnt == 2 ? &tr2 : NULL, whichfork);
}

/*
3846
 * Add bmap trace entry after updating an extent record in place.
L
Linus Torvalds 已提交
3847 3848 3849
 */
STATIC void
xfs_bmap_trace_post_update(
3850
	const char	*fname,		/* function name */
L
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3851 3852 3853 3854 3855 3856 3857 3858 3859
	char		*desc,		/* operation description */
	xfs_inode_t	*ip,		/* incore inode pointer */
	xfs_extnum_t	idx,		/* index of entry updated */
	int		whichfork)	/* data or attr fork */
{
	xfs_ifork_t	*ifp;		/* inode fork pointer */

	ifp = XFS_IFORK_PTR(ip, whichfork);
	xfs_bmap_trace_addentry(XFS_BMAP_KTRACE_POST_UP, fname, desc, ip, idx,
3860
		1, xfs_iext_get_ext(ifp, idx), NULL, whichfork);
L
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3861 3862 3863
}

/*
3864
 * Add bmap trace entry prior to updating an extent record in place.
L
Linus Torvalds 已提交
3865 3866 3867
 */
STATIC void
xfs_bmap_trace_pre_update(
3868
	const char	*fname,		/* function name */
L
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3869 3870 3871 3872 3873 3874 3875 3876 3877
	char		*desc,		/* operation description */
	xfs_inode_t	*ip,		/* incore inode pointer */
	xfs_extnum_t	idx,		/* index of entry to be updated */
	int		whichfork)	/* data or attr fork */
{
	xfs_ifork_t	*ifp;		/* inode fork pointer */

	ifp = XFS_IFORK_PTR(ip, whichfork);
	xfs_bmap_trace_addentry(XFS_BMAP_KTRACE_PRE_UP, fname, desc, ip, idx, 1,
3878
		xfs_iext_get_ext(ifp, idx), NULL, whichfork);
L
Linus Torvalds 已提交
3879 3880 3881 3882 3883 3884 3885 3886 3887 3888 3889 3890 3891 3892 3893 3894 3895 3896 3897 3898 3899 3900 3901 3902 3903 3904 3905 3906 3907 3908 3909 3910 3911 3912 3913 3914 3915 3916 3917 3918 3919 3920 3921 3922 3923 3924
}
#endif	/* XFS_BMAP_TRACE */

/*
 * Compute the worst-case number of indirect blocks that will be used
 * for ip's delayed extent of length "len".
 */
STATIC xfs_filblks_t
xfs_bmap_worst_indlen(
	xfs_inode_t	*ip,		/* incore inode pointer */
	xfs_filblks_t	len)		/* delayed extent length */
{
	int		level;		/* btree level number */
	int		maxrecs;	/* maximum record count at this level */
	xfs_mount_t	*mp;		/* mount structure */
	xfs_filblks_t	rval;		/* return value */

	mp = ip->i_mount;
	maxrecs = mp->m_bmap_dmxr[0];
	for (level = 0, rval = 0;
	     level < XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK);
	     level++) {
		len += maxrecs - 1;
		do_div(len, maxrecs);
		rval += len;
		if (len == 1)
			return rval + XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK) -
				level - 1;
		if (level == 0)
			maxrecs = mp->m_bmap_dmxr[1];
	}
	return rval;
}

#if defined(XFS_RW_TRACE)
STATIC void
xfs_bunmap_trace(
	xfs_inode_t		*ip,
	xfs_fileoff_t		bno,
	xfs_filblks_t		len,
	int			flags,
	inst_t			*ra)
{
	if (ip->i_rwtrace == NULL)
		return;
	ktrace_enter(ip->i_rwtrace,
3925
		(void *)(__psint_t)XFS_BUNMAP,
L
Linus Torvalds 已提交
3926 3927 3928 3929 3930 3931 3932 3933 3934 3935 3936 3937 3938 3939 3940 3941 3942 3943 3944 3945 3946 3947 3948 3949 3950
		(void *)ip,
		(void *)(__psint_t)((ip->i_d.di_size >> 32) & 0xffffffff),
		(void *)(__psint_t)(ip->i_d.di_size & 0xffffffff),
		(void *)(__psint_t)(((xfs_dfiloff_t)bno >> 32) & 0xffffffff),
		(void *)(__psint_t)((xfs_dfiloff_t)bno & 0xffffffff),
		(void *)(__psint_t)len,
		(void *)(__psint_t)flags,
		(void *)(unsigned long)current_cpu(),
		(void *)ra,
		(void *)0,
		(void *)0,
		(void *)0,
		(void *)0,
		(void *)0,
		(void *)0);
}
#endif

/*
 * Convert inode from non-attributed to attributed.
 * Must not be in a transaction, ip must not be locked.
 */
int						/* error code */
xfs_bmap_add_attrfork(
	xfs_inode_t		*ip,		/* incore inode pointer */
3951 3952
	int			size,		/* space new attribute needs */
	int			rsvd)		/* xact may use reserved blks */
L
Linus Torvalds 已提交
3953 3954
{
	xfs_fsblock_t		firstblock;	/* 1st block/ag allocated */
3955
	xfs_bmap_free_t		flist;		/* freed extent records */
L
Linus Torvalds 已提交
3956 3957
	xfs_mount_t		*mp;		/* mount structure */
	xfs_trans_t		*tp;		/* transaction pointer */
3958 3959 3960 3961 3962 3963
	unsigned long		s;		/* spinlock spl value */
	int			blks;		/* space reservation */
	int			version = 1;	/* superblock attr version */
	int			committed;	/* xaction was committed */
	int			logflags;	/* logging flags */
	int			error;		/* error return value */
L
Linus Torvalds 已提交
3964

3965
	ASSERT(XFS_IFORK_Q(ip) == 0);
L
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3966 3967
	ASSERT(ip->i_df.if_ext_max ==
	       XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
3968

L
Linus Torvalds 已提交
3969 3970 3971 3972 3973 3974 3975 3976 3977 3978 3979 3980 3981 3982 3983 3984 3985 3986 3987 3988 3989 3990 3991 3992 3993 3994 3995 3996 3997 3998 3999 4000 4001 4002 4003 4004 4005 4006 4007 4008 4009
	mp = ip->i_mount;
	ASSERT(!XFS_NOT_DQATTACHED(mp, ip));
	tp = xfs_trans_alloc(mp, XFS_TRANS_ADDAFORK);
	blks = XFS_ADDAFORK_SPACE_RES(mp);
	if (rsvd)
		tp->t_flags |= XFS_TRANS_RESERVE;
	if ((error = xfs_trans_reserve(tp, blks, XFS_ADDAFORK_LOG_RES(mp), 0,
			XFS_TRANS_PERM_LOG_RES, XFS_ADDAFORK_LOG_COUNT)))
		goto error0;
	xfs_ilock(ip, XFS_ILOCK_EXCL);
	error = XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, tp, ip, blks, 0, rsvd ?
			XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES :
			XFS_QMOPT_RES_REGBLKS);
	if (error) {
		xfs_iunlock(ip, XFS_ILOCK_EXCL);
		xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES);
		return error;
	}
	if (XFS_IFORK_Q(ip))
		goto error1;
	if (ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS) {
		/*
		 * For inodes coming from pre-6.2 filesystems.
		 */
		ASSERT(ip->i_d.di_aformat == 0);
		ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS;
	}
	ASSERT(ip->i_d.di_anextents == 0);
	VN_HOLD(XFS_ITOV(ip));
	xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
	switch (ip->i_d.di_format) {
	case XFS_DINODE_FMT_DEV:
		ip->i_d.di_forkoff = roundup(sizeof(xfs_dev_t), 8) >> 3;
		break;
	case XFS_DINODE_FMT_UUID:
		ip->i_d.di_forkoff = roundup(sizeof(uuid_t), 8) >> 3;
		break;
	case XFS_DINODE_FMT_LOCAL:
	case XFS_DINODE_FMT_EXTENTS:
	case XFS_DINODE_FMT_BTREE:
4010 4011 4012
		ip->i_d.di_forkoff = xfs_attr_shortform_bytesfit(ip, size);
		if (!ip->i_d.di_forkoff)
			ip->i_d.di_forkoff = mp->m_attroffset >> 3;
4013
		else if (mp->m_flags & XFS_MOUNT_ATTR2)
4014
			version = 2;
L
Linus Torvalds 已提交
4015 4016 4017 4018 4019 4020 4021 4022 4023 4024 4025 4026 4027 4028 4029 4030 4031 4032 4033 4034 4035 4036 4037 4038 4039 4040 4041 4042 4043 4044 4045 4046 4047 4048 4049 4050
		break;
	default:
		ASSERT(0);
		error = XFS_ERROR(EINVAL);
		goto error1;
	}
	ip->i_df.if_ext_max =
		XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t);
	ASSERT(ip->i_afp == NULL);
	ip->i_afp = kmem_zone_zalloc(xfs_ifork_zone, KM_SLEEP);
	ip->i_afp->if_ext_max =
		XFS_IFORK_ASIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t);
	ip->i_afp->if_flags = XFS_IFEXTENTS;
	logflags = 0;
	XFS_BMAP_INIT(&flist, &firstblock);
	switch (ip->i_d.di_format) {
	case XFS_DINODE_FMT_LOCAL:
		error = xfs_bmap_add_attrfork_local(tp, ip, &firstblock, &flist,
			&logflags);
		break;
	case XFS_DINODE_FMT_EXTENTS:
		error = xfs_bmap_add_attrfork_extents(tp, ip, &firstblock,
			&flist, &logflags);
		break;
	case XFS_DINODE_FMT_BTREE:
		error = xfs_bmap_add_attrfork_btree(tp, ip, &firstblock, &flist,
			&logflags);
		break;
	default:
		error = 0;
		break;
	}
	if (logflags)
		xfs_trans_log_inode(tp, ip, logflags);
	if (error)
		goto error2;
4051 4052
	if (!XFS_SB_VERSION_HASATTR(&mp->m_sb) ||
	   (!XFS_SB_VERSION_HASATTR2(&mp->m_sb) && version == 2)) {
4053 4054
		__int64_t sbfields = 0;

L
Linus Torvalds 已提交
4055 4056 4057
		s = XFS_SB_LOCK(mp);
		if (!XFS_SB_VERSION_HASATTR(&mp->m_sb)) {
			XFS_SB_VERSION_ADDATTR(&mp->m_sb);
4058
			sbfields |= XFS_SB_VERSIONNUM;
4059 4060 4061
		}
		if (!XFS_SB_VERSION_HASATTR2(&mp->m_sb) && version == 2) {
			XFS_SB_VERSION_ADDATTR2(&mp->m_sb);
4062
			sbfields |= (XFS_SB_VERSIONNUM | XFS_SB_FEATURES2);
4063
		}
4064
		if (sbfields) {
L
Linus Torvalds 已提交
4065
			XFS_SB_UNLOCK(mp, s);
4066
			xfs_mod_sb(tp, sbfields);
L
Linus Torvalds 已提交
4067 4068 4069
		} else
			XFS_SB_UNLOCK(mp, s);
	}
4070
	if ((error = xfs_bmap_finish(&tp, &flist, &committed)))
L
Linus Torvalds 已提交
4071
		goto error2;
4072
	error = xfs_trans_commit(tp, XFS_TRANS_PERM_LOG_RES);
L
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4073 4074 4075 4076 4077 4078 4079 4080 4081 4082 4083 4084 4085 4086 4087 4088 4089 4090 4091 4092 4093 4094 4095 4096 4097 4098 4099 4100 4101 4102 4103 4104 4105 4106 4107 4108 4109 4110 4111 4112 4113 4114 4115 4116 4117 4118 4119 4120 4121 4122 4123 4124 4125 4126 4127 4128 4129 4130 4131 4132 4133 4134 4135 4136 4137 4138 4139 4140 4141 4142 4143 4144 4145 4146 4147 4148 4149 4150 4151 4152 4153 4154 4155 4156 4157 4158
	ASSERT(ip->i_df.if_ext_max ==
	       XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
	return error;
error2:
	xfs_bmap_cancel(&flist);
error1:
	ASSERT(ismrlocked(&ip->i_lock,MR_UPDATE));
	xfs_iunlock(ip, XFS_ILOCK_EXCL);
error0:
	xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
	ASSERT(ip->i_df.if_ext_max ==
	       XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
	return error;
}

/*
 * Add the extent to the list of extents to be free at transaction end.
 * The list is maintained sorted (by block number).
 */
/* ARGSUSED */
void
xfs_bmap_add_free(
	xfs_fsblock_t		bno,		/* fs block number of extent */
	xfs_filblks_t		len,		/* length of extent */
	xfs_bmap_free_t		*flist,		/* list of extents */
	xfs_mount_t		*mp)		/* mount point structure */
{
	xfs_bmap_free_item_t	*cur;		/* current (next) element */
	xfs_bmap_free_item_t	*new;		/* new element */
	xfs_bmap_free_item_t	*prev;		/* previous element */
#ifdef DEBUG
	xfs_agnumber_t		agno;
	xfs_agblock_t		agbno;

	ASSERT(bno != NULLFSBLOCK);
	ASSERT(len > 0);
	ASSERT(len <= MAXEXTLEN);
	ASSERT(!ISNULLSTARTBLOCK(bno));
	agno = XFS_FSB_TO_AGNO(mp, bno);
	agbno = XFS_FSB_TO_AGBNO(mp, bno);
	ASSERT(agno < mp->m_sb.sb_agcount);
	ASSERT(agbno < mp->m_sb.sb_agblocks);
	ASSERT(len < mp->m_sb.sb_agblocks);
	ASSERT(agbno + len <= mp->m_sb.sb_agblocks);
#endif
	ASSERT(xfs_bmap_free_item_zone != NULL);
	new = kmem_zone_alloc(xfs_bmap_free_item_zone, KM_SLEEP);
	new->xbfi_startblock = bno;
	new->xbfi_blockcount = (xfs_extlen_t)len;
	for (prev = NULL, cur = flist->xbf_first;
	     cur != NULL;
	     prev = cur, cur = cur->xbfi_next) {
		if (cur->xbfi_startblock >= bno)
			break;
	}
	if (prev)
		prev->xbfi_next = new;
	else
		flist->xbf_first = new;
	new->xbfi_next = cur;
	flist->xbf_count++;
}

/*
 * Compute and fill in the value of the maximum depth of a bmap btree
 * in this filesystem.  Done once, during mount.
 */
void
xfs_bmap_compute_maxlevels(
	xfs_mount_t	*mp,		/* file system mount structure */
	int		whichfork)	/* data or attr fork */
{
	int		level;		/* btree level */
	uint		maxblocks;	/* max blocks at this level */
	uint		maxleafents;	/* max leaf entries possible */
	int		maxrootrecs;	/* max records in root block */
	int		minleafrecs;	/* min records in leaf block */
	int		minnoderecs;	/* min records in node block */
	int		sz;		/* root block size */

	/*
	 * The maximum number of extents in a file, hence the maximum
	 * number of leaf entries, is controlled by the type of di_nextents
	 * (a signed 32-bit number, xfs_extnum_t), or by di_anextents
	 * (a signed 16-bit number, xfs_aextnum_t).
	 */
4159 4160
	if (whichfork == XFS_DATA_FORK) {
		maxleafents = MAXEXTNUM;
4161 4162
		sz = (mp->m_flags & XFS_MOUNT_ATTR2) ?
			XFS_BMDR_SPACE_CALC(MINDBTPTRS) : mp->m_attroffset;
4163 4164
	} else {
		maxleafents = MAXAEXTNUM;
4165 4166 4167
		sz = (mp->m_flags & XFS_MOUNT_ATTR2) ?
			XFS_BMDR_SPACE_CALC(MINABTPTRS) :
			mp->m_sb.sb_inodesize - mp->m_attroffset;
4168 4169
	}
	maxrootrecs = (int)XFS_BTREE_BLOCK_MAXRECS(sz, xfs_bmdr, 0);
L
Linus Torvalds 已提交
4170 4171 4172 4173 4174 4175 4176 4177 4178 4179 4180 4181 4182 4183 4184 4185 4186 4187 4188 4189 4190 4191 4192 4193 4194 4195 4196 4197 4198 4199 4200 4201 4202 4203 4204 4205 4206 4207
	minleafrecs = mp->m_bmap_dmnr[0];
	minnoderecs = mp->m_bmap_dmnr[1];
	maxblocks = (maxleafents + minleafrecs - 1) / minleafrecs;
	for (level = 1; maxblocks > 1; level++) {
		if (maxblocks <= maxrootrecs)
			maxblocks = 1;
		else
			maxblocks = (maxblocks + minnoderecs - 1) / minnoderecs;
	}
	mp->m_bm_maxlevels[whichfork] = level;
}

/*
 * Routine to be called at transaction's end by xfs_bmapi, xfs_bunmapi
 * caller.  Frees all the extents that need freeing, which must be done
 * last due to locking considerations.  We never free any extents in
 * the first transaction.  This is to allow the caller to make the first
 * transaction a synchronous one so that the pointers to the data being
 * broken in this transaction will be permanent before the data is actually
 * freed.  This is necessary to prevent blocks from being reallocated
 * and written to before the free and reallocation are actually permanent.
 * We do not just make the first transaction synchronous here, because
 * there are more efficient ways to gain the same protection in some cases
 * (see the file truncation code).
 *
 * Return 1 if the given transaction was committed and a new one
 * started, and 0 otherwise in the committed parameter.
 */
/*ARGSUSED*/
int						/* error */
xfs_bmap_finish(
	xfs_trans_t		**tp,		/* transaction pointer addr */
	xfs_bmap_free_t		*flist,		/* i/o: list extents to free */
	int			*committed)	/* xact committed or not */
{
	xfs_efd_log_item_t	*efd;		/* extent free data */
	xfs_efi_log_item_t	*efi;		/* extent free intention */
	int			error;		/* error return value */
4208
	xfs_bmap_free_item_t	*free;		/* free extent item */
L
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	unsigned int		logres;		/* new log reservation */
	unsigned int		logcount;	/* new log count */
	xfs_mount_t		*mp;		/* filesystem mount structure */
	xfs_bmap_free_item_t	*next;		/* next item on free list */
	xfs_trans_t		*ntp;		/* new transaction pointer */

	ASSERT((*tp)->t_flags & XFS_TRANS_PERM_LOG_RES);
	if (flist->xbf_count == 0) {
		*committed = 0;
		return 0;
	}
	ntp = *tp;
	efi = xfs_trans_get_efi(ntp, flist->xbf_count);
	for (free = flist->xbf_first; free; free = free->xbfi_next)
		xfs_trans_log_efi_extent(ntp, efi, free->xbfi_startblock,
			free->xbfi_blockcount);
	logres = ntp->t_log_res;
	logcount = ntp->t_log_count;
	ntp = xfs_trans_dup(*tp);
4228
	error = xfs_trans_commit(*tp, 0);
L
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	*tp = ntp;
	*committed = 1;
	/*
	 * We have a new transaction, so we should return committed=1,
	 * even though we're returning an error.
	 */
	if (error) {
		return error;
	}
	if ((error = xfs_trans_reserve(ntp, 0, logres, 0, XFS_TRANS_PERM_LOG_RES,
			logcount)))
		return error;
	efd = xfs_trans_get_efd(ntp, efi, flist->xbf_count);
	for (free = flist->xbf_first; free != NULL; free = next) {
		next = free->xbfi_next;
		if ((error = xfs_free_extent(ntp, free->xbfi_startblock,
				free->xbfi_blockcount))) {
			/*
			 * The bmap free list will be cleaned up at a
			 * higher level.  The EFI will be canceled when
			 * this transaction is aborted.
			 * Need to force shutdown here to make sure it
			 * happens, since this transaction may not be
			 * dirty yet.
			 */
			mp = ntp->t_mountp;
			if (!XFS_FORCED_SHUTDOWN(mp))
				xfs_force_shutdown(mp,
						   (error == EFSCORRUPTED) ?
4258 4259
						   SHUTDOWN_CORRUPT_INCORE :
						   SHUTDOWN_META_IO_ERROR);
L
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			return error;
		}
		xfs_trans_log_efd_extent(ntp, efd, free->xbfi_startblock,
			free->xbfi_blockcount);
		xfs_bmap_del_free(flist, NULL, free);
	}
	return 0;
}

/*
 * Free up any items left in the list.
 */
void
xfs_bmap_cancel(
	xfs_bmap_free_t		*flist)	/* list of bmap_free_items */
{
	xfs_bmap_free_item_t	*free;	/* free list item */
	xfs_bmap_free_item_t	*next;

	if (flist->xbf_count == 0)
		return;
	ASSERT(flist->xbf_first != NULL);
	for (free = flist->xbf_first; free; free = next) {
		next = free->xbfi_next;
		xfs_bmap_del_free(flist, NULL, free);
	}
	ASSERT(flist->xbf_count == 0);
}

/*
 * Returns the file-relative block number of the first unused block(s)
 * in the file with at least "len" logically contiguous blocks free.
 * This is the lowest-address hole if the file has holes, else the first block
 * past the end of file.
 * Return 0 if the file is currently local (in-inode).
 */
int						/* error */
xfs_bmap_first_unused(
	xfs_trans_t	*tp,			/* transaction pointer */
	xfs_inode_t	*ip,			/* incore inode */
	xfs_extlen_t	len,			/* size of hole to find */
	xfs_fileoff_t	*first_unused,		/* unused block */
	int		whichfork)		/* data or attr fork */
{
	int		error;			/* error return value */
4305
	int		idx;			/* extent record index */
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	xfs_ifork_t	*ifp;			/* inode fork pointer */
	xfs_fileoff_t	lastaddr;		/* last block number seen */
	xfs_fileoff_t	lowest;			/* lowest useful block */
	xfs_fileoff_t	max;			/* starting useful block */
	xfs_fileoff_t	off;			/* offset for this block */
	xfs_extnum_t	nextents;		/* number of extent entries */

	ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE ||
	       XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS ||
	       XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
	if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
		*first_unused = 0;
		return 0;
	}
	ifp = XFS_IFORK_PTR(ip, whichfork);
	if (!(ifp->if_flags & XFS_IFEXTENTS) &&
	    (error = xfs_iread_extents(tp, ip, whichfork)))
		return error;
	lowest = *first_unused;
	nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
4326
	for (idx = 0, lastaddr = 0, max = lowest; idx < nextents; idx++) {
4327
		xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, idx);
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		off = xfs_bmbt_get_startoff(ep);
		/*
		 * See if the hole before this extent will work.
		 */
		if (off >= lowest + len && off - max >= len) {
			*first_unused = max;
			return 0;
		}
		lastaddr = off + xfs_bmbt_get_blockcount(ep);
		max = XFS_FILEOFF_MAX(lastaddr, lowest);
	}
	*first_unused = max;
	return 0;
}

/*
 * Returns the file-relative block number of the last block + 1 before
 * last_block (input value) in the file.
4346 4347
 * This is not based on i_size, it is based on the extent records.
 * Returns 0 for local files, as they do not have extent records.
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 */
int						/* error */
xfs_bmap_last_before(
	xfs_trans_t	*tp,			/* transaction pointer */
	xfs_inode_t	*ip,			/* incore inode */
	xfs_fileoff_t	*last_block,		/* last block */
	int		whichfork)		/* data or attr fork */
{
	xfs_fileoff_t	bno;			/* input file offset */
	int		eof;			/* hit end of file */
4358
	xfs_bmbt_rec_host_t *ep;		/* pointer to last extent */
L
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	int		error;			/* error return value */
	xfs_bmbt_irec_t	got;			/* current extent value */
	xfs_ifork_t	*ifp;			/* inode fork pointer */
	xfs_extnum_t	lastx;			/* last extent used */
	xfs_bmbt_irec_t	prev;			/* previous extent value */

	if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
	    XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
	    XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL)
	       return XFS_ERROR(EIO);
	if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
		*last_block = 0;
		return 0;
	}
	ifp = XFS_IFORK_PTR(ip, whichfork);
	if (!(ifp->if_flags & XFS_IFEXTENTS) &&
	    (error = xfs_iread_extents(tp, ip, whichfork)))
		return error;
	bno = *last_block - 1;
	ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
		&prev);
	if (eof || xfs_bmbt_get_startoff(ep) > bno) {
		if (prev.br_startoff == NULLFILEOFF)
			*last_block = 0;
		else
			*last_block = prev.br_startoff + prev.br_blockcount;
	}
	/*
	 * Otherwise *last_block is already the right answer.
	 */
	return 0;
}

/*
 * Returns the file-relative block number of the first block past eof in
4394 4395
 * the file.  This is not based on i_size, it is based on the extent records.
 * Returns 0 for local files, as they do not have extent records.
L
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 */
int						/* error */
xfs_bmap_last_offset(
	xfs_trans_t	*tp,			/* transaction pointer */
	xfs_inode_t	*ip,			/* incore inode */
	xfs_fileoff_t	*last_block,		/* last block */
	int		whichfork)		/* data or attr fork */
{
4404
	xfs_bmbt_rec_host_t *ep;		/* pointer to last extent */
L
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	int		error;			/* error return value */
	xfs_ifork_t	*ifp;			/* inode fork pointer */
	xfs_extnum_t	nextents;		/* number of extent entries */

	if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
	    XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
	    XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL)
	       return XFS_ERROR(EIO);
	if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
		*last_block = 0;
		return 0;
	}
	ifp = XFS_IFORK_PTR(ip, whichfork);
	if (!(ifp->if_flags & XFS_IFEXTENTS) &&
	    (error = xfs_iread_extents(tp, ip, whichfork)))
		return error;
	nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
	if (!nextents) {
		*last_block = 0;
		return 0;
	}
4426
	ep = xfs_iext_get_ext(ifp, nextents - 1);
L
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4427 4428 4429 4430 4431 4432 4433 4434 4435 4436 4437 4438 4439 4440
	*last_block = xfs_bmbt_get_startoff(ep) + xfs_bmbt_get_blockcount(ep);
	return 0;
}

/*
 * Returns whether the selected fork of the inode has exactly one
 * block or not.  For the data fork we check this matches di_size,
 * implying the file's range is 0..bsize-1.
 */
int					/* 1=>1 block, 0=>otherwise */
xfs_bmap_one_block(
	xfs_inode_t	*ip,		/* incore inode */
	int		whichfork)	/* data or attr fork */
{
4441
	xfs_bmbt_rec_host_t *ep;	/* ptr to fork's extent */
L
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	xfs_ifork_t	*ifp;		/* inode fork pointer */
	int		rval;		/* return value */
	xfs_bmbt_irec_t	s;		/* internal version of extent */

#ifndef DEBUG
4447 4448 4449 4450 4451
	if (whichfork == XFS_DATA_FORK) {
		return ((ip->i_d.di_mode & S_IFMT) == S_IFREG) ?
			(ip->i_size == ip->i_mount->m_sb.sb_blocksize) :
			(ip->i_d.di_size == ip->i_mount->m_sb.sb_blocksize);
	}
L
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4452 4453 4454 4455 4456 4457 4458
#endif	/* !DEBUG */
	if (XFS_IFORK_NEXTENTS(ip, whichfork) != 1)
		return 0;
	if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
		return 0;
	ifp = XFS_IFORK_PTR(ip, whichfork);
	ASSERT(ifp->if_flags & XFS_IFEXTENTS);
4459
	ep = xfs_iext_get_ext(ifp, 0);
L
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4460 4461 4462
	xfs_bmbt_get_all(ep, &s);
	rval = s.br_startoff == 0 && s.br_blockcount == 1;
	if (rval && whichfork == XFS_DATA_FORK)
4463
		ASSERT(ip->i_size == ip->i_mount->m_sb.sb_blocksize);
L
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	return rval;
}

/*
 * Read in the extents to if_extents.
 * All inode fields are set up by caller, we just traverse the btree
 * and copy the records in. If the file system cannot contain unwritten
 * extents, the records are checked for no "state" flags.
 */
int					/* error */
xfs_bmap_read_extents(
	xfs_trans_t		*tp,	/* transaction pointer */
	xfs_inode_t		*ip,	/* incore inode */
	int			whichfork) /* data or attr fork */
{
	xfs_bmbt_block_t	*block;	/* current btree block */
	xfs_fsblock_t		bno;	/* block # of "block" */
	xfs_buf_t		*bp;	/* buffer for "block" */
	int			error;	/* error return value */
	xfs_exntfmt_t		exntf;	/* XFS_EXTFMT_NOSTATE, if checking */
	xfs_extnum_t		i, j;	/* index into the extents list */
	xfs_ifork_t		*ifp;	/* fork structure */
	int			level;	/* btree level, for checking */
	xfs_mount_t		*mp;	/* file system mount structure */
4488
	__be64			*pp;	/* pointer to block address */
L
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4489 4490 4491 4492 4493 4494 4495 4496 4497 4498 4499 4500
	/* REFERENCED */
	xfs_extnum_t		room;	/* number of entries there's room for */

	bno = NULLFSBLOCK;
	mp = ip->i_mount;
	ifp = XFS_IFORK_PTR(ip, whichfork);
	exntf = (whichfork != XFS_DATA_FORK) ? XFS_EXTFMT_NOSTATE :
					XFS_EXTFMT_INODE(ip);
	block = ifp->if_broot;
	/*
	 * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
	 */
4501 4502
	level = be16_to_cpu(block->bb_level);
	ASSERT(level > 0);
L
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4503
	pp = XFS_BMAP_BROOT_PTR_ADDR(block, 1, ifp->if_broot_bytes);
4504 4505 4506 4507
	bno = be64_to_cpu(*pp);
	ASSERT(bno != NULLDFSBNO);
	ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount);
	ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks);
L
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4508 4509 4510 4511 4512 4513 4514 4515 4516 4517 4518 4519 4520 4521
	/*
	 * Go down the tree until leaf level is reached, following the first
	 * pointer (leftmost) at each level.
	 */
	while (level-- > 0) {
		if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
				XFS_BMAP_BTREE_REF)))
			return error;
		block = XFS_BUF_TO_BMBT_BLOCK(bp);
		XFS_WANT_CORRUPTED_GOTO(
			XFS_BMAP_SANITY_CHECK(mp, block, level),
			error0);
		if (level == 0)
			break;
4522
		pp = XFS_BTREE_PTR_ADDR(xfs_bmbt, block, 1, mp->m_bmap_dmxr[1]);
4523 4524
		bno = be64_to_cpu(*pp);
		XFS_WANT_CORRUPTED_GOTO(XFS_FSB_SANITY_CHECK(mp, bno), error0);
L
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4525 4526 4527 4528 4529
		xfs_trans_brelse(tp, bp);
	}
	/*
	 * Here with bp and block set to the leftmost leaf node in the tree.
	 */
4530
	room = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
L
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4531 4532
	i = 0;
	/*
4533
	 * Loop over all leaf nodes.  Copy information to the extent records.
L
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4534 4535
	 */
	for (;;) {
4536
		xfs_bmbt_rec_t	*frp;
L
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4537 4538
		xfs_fsblock_t	nextbno;
		xfs_extnum_t	num_recs;
4539
		xfs_extnum_t	start;
L
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4540 4541


4542
		num_recs = be16_to_cpu(block->bb_numrecs);
L
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4543 4544
		if (unlikely(i + num_recs > room)) {
			ASSERT(i + num_recs <= room);
4545 4546
			xfs_fs_repair_cmn_err(CE_WARN, ip->i_mount,
				"corrupt dinode %Lu, (btree extents).",
L
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4547 4548 4549 4550 4551 4552 4553 4554 4555 4556 4557 4558
				(unsigned long long) ip->i_ino);
			XFS_ERROR_REPORT("xfs_bmap_read_extents(1)",
					 XFS_ERRLEVEL_LOW,
					ip->i_mount);
			goto error0;
		}
		XFS_WANT_CORRUPTED_GOTO(
			XFS_BMAP_SANITY_CHECK(mp, block, 0),
			error0);
		/*
		 * Read-ahead the next leaf block, if any.
		 */
4559
		nextbno = be64_to_cpu(block->bb_rightsib);
L
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		if (nextbno != NULLFSBLOCK)
			xfs_btree_reada_bufl(mp, nextbno, 1);
		/*
4563
		 * Copy records into the extent records.
L
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4564
		 */
4565
		frp = XFS_BTREE_REC_ADDR(xfs_bmbt, block, 1);
4566 4567
		start = i;
		for (j = 0; j < num_recs; j++, i++, frp++) {
4568
			xfs_bmbt_rec_host_t *trp = xfs_iext_get_ext(ifp, i);
4569 4570
			trp->l0 = be64_to_cpu(frp->l0);
			trp->l1 = be64_to_cpu(frp->l1);
L
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4571 4572 4573 4574 4575 4576 4577
		}
		if (exntf == XFS_EXTFMT_NOSTATE) {
			/*
			 * Check all attribute bmap btree records and
			 * any "older" data bmap btree records for a
			 * set bit in the "extent flag" position.
			 */
4578 4579
			if (unlikely(xfs_check_nostate_extents(ifp,
					start, num_recs))) {
L
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				XFS_ERROR_REPORT("xfs_bmap_read_extents(2)",
						 XFS_ERRLEVEL_LOW,
						 ip->i_mount);
				goto error0;
			}
		}
		xfs_trans_brelse(tp, bp);
		bno = nextbno;
		/*
		 * If we've reached the end, stop.
		 */
		if (bno == NULLFSBLOCK)
			break;
		if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
				XFS_BMAP_BTREE_REF)))
			return error;
		block = XFS_BUF_TO_BMBT_BLOCK(bp);
	}
4598
	ASSERT(i == (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)));
L
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4599
	ASSERT(i == XFS_IFORK_NEXTENTS(ip, whichfork));
4600
	XFS_BMAP_TRACE_EXLIST(ip, i, whichfork);
L
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	return 0;
error0:
	xfs_trans_brelse(tp, bp);
	return XFS_ERROR(EFSCORRUPTED);
}

#ifdef XFS_BMAP_TRACE
/*
4609
 * Add bmap trace insert entries for all the contents of the extent records.
L
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 */
void
xfs_bmap_trace_exlist(
4613
	const char	*fname,		/* function name */
L
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4614 4615 4616 4617
	xfs_inode_t	*ip,		/* incore inode pointer */
	xfs_extnum_t	cnt,		/* count of entries in the list */
	int		whichfork)	/* data or attr fork */
{
4618
	xfs_bmbt_rec_host_t *ep;	/* current extent record */
4619
	xfs_extnum_t	idx;		/* extent record index */
L
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4620
	xfs_ifork_t	*ifp;		/* inode fork pointer */
4621
	xfs_bmbt_irec_t	s;		/* file extent record */
L
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4622 4623

	ifp = XFS_IFORK_PTR(ip, whichfork);
4624 4625 4626
	ASSERT(cnt == (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)));
	for (idx = 0; idx < cnt; idx++) {
		ep = xfs_iext_get_ext(ifp, idx);
L
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4627
		xfs_bmbt_get_all(ep, &s);
4628
		XFS_BMAP_TRACE_INSERT("exlist", ip, idx, 1, &s, NULL,
L
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			whichfork);
	}
}
#endif

#ifdef DEBUG
/*
 * Validate that the bmbt_irecs being returned from bmapi are valid
 * given the callers original parameters.  Specifically check the
 * ranges of the returned irecs to ensure that they only extent beyond
 * the given parameters if the XFS_BMAPI_ENTIRE flag was set.
 */
STATIC void
xfs_bmap_validate_ret(
	xfs_fileoff_t		bno,
	xfs_filblks_t		len,
	int			flags,
	xfs_bmbt_irec_t		*mval,
	int			nmap,
	int			ret_nmap)
{
	int			i;		/* index to map values */

	ASSERT(ret_nmap <= nmap);

	for (i = 0; i < ret_nmap; i++) {
		ASSERT(mval[i].br_blockcount > 0);
		if (!(flags & XFS_BMAPI_ENTIRE)) {
			ASSERT(mval[i].br_startoff >= bno);
			ASSERT(mval[i].br_blockcount <= len);
			ASSERT(mval[i].br_startoff + mval[i].br_blockcount <=
			       bno + len);
		} else {
			ASSERT(mval[i].br_startoff < bno + len);
			ASSERT(mval[i].br_startoff + mval[i].br_blockcount >
			       bno);
		}
		ASSERT(i == 0 ||
		       mval[i - 1].br_startoff + mval[i - 1].br_blockcount ==
		       mval[i].br_startoff);
		if ((flags & XFS_BMAPI_WRITE) && !(flags & XFS_BMAPI_DELAY))
			ASSERT(mval[i].br_startblock != DELAYSTARTBLOCK &&
			       mval[i].br_startblock != HOLESTARTBLOCK);
		ASSERT(mval[i].br_state == XFS_EXT_NORM ||
		       mval[i].br_state == XFS_EXT_UNWRITTEN);
	}
}
#endif /* DEBUG */


/*
 * Map file blocks to filesystem blocks.
 * File range is given by the bno/len pair.
 * Adds blocks to file if a write ("flags & XFS_BMAPI_WRITE" set)
 * into a hole or past eof.
 * Only allocates blocks from a single allocation group,
 * to avoid locking problems.
 * The returned value in "firstblock" from the first call in a transaction
 * must be remembered and presented to subsequent calls in "firstblock".
 * An upper bound for the number of blocks to be allocated is supplied to
 * the first call in "total"; if no allocation group has that many free
 * blocks then the call will fail (return NULLFSBLOCK in "firstblock").
 */
int					/* error */
xfs_bmapi(
	xfs_trans_t	*tp,		/* transaction pointer */
	xfs_inode_t	*ip,		/* incore inode */
	xfs_fileoff_t	bno,		/* starting file offs. mapped */
	xfs_filblks_t	len,		/* length to map in file */
	int		flags,		/* XFS_BMAPI_... */
	xfs_fsblock_t	*firstblock,	/* first allocated block
					   controls a.g. for allocs */
	xfs_extlen_t	total,		/* total blocks needed */
	xfs_bmbt_irec_t	*mval,		/* output: map values */
	int		*nmap,		/* i/o: mval size/count */
4704 4705
	xfs_bmap_free_t	*flist,		/* i/o: list extents to free */
	xfs_extdelta_t	*delta)		/* o: change made to incore extents */
L
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4706 4707 4708 4709 4710 4711 4712
{
	xfs_fsblock_t	abno;		/* allocated block number */
	xfs_extlen_t	alen;		/* allocated extent length */
	xfs_fileoff_t	aoff;		/* allocated file offset */
	xfs_bmalloca_t	bma;		/* args for xfs_bmap_alloc */
	xfs_btree_cur_t	*cur;		/* bmap btree cursor */
	xfs_fileoff_t	end;		/* end of mapped file region */
4713
	int		eof;		/* we've hit the end of extents */
4714
	xfs_bmbt_rec_host_t *ep;	/* extent record pointer */
L
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4715
	int		error;		/* error return */
4716
	xfs_bmbt_irec_t	got;		/* current file extent record */
L
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4717 4718 4719 4720 4721 4722 4723 4724 4725 4726 4727
	xfs_ifork_t	*ifp;		/* inode fork pointer */
	xfs_extlen_t	indlen;		/* indirect blocks length */
	xfs_extnum_t	lastx;		/* last useful extent number */
	int		logflags;	/* flags for transaction logging */
	xfs_extlen_t	minleft;	/* min blocks left after allocation */
	xfs_extlen_t	minlen;		/* min allocation size */
	xfs_mount_t	*mp;		/* xfs mount structure */
	int		n;		/* current extent index */
	int		nallocs;	/* number of extents alloc\'d */
	xfs_extnum_t	nextents;	/* number of extents in file */
	xfs_fileoff_t	obno;		/* old block number (offset) */
4728
	xfs_bmbt_irec_t	prev;		/* previous file extent record */
L
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4729
	int		tmp_logflags;	/* temp flags holder */
4730 4731
	int		whichfork;	/* data or attr fork */
	char		inhole;		/* current location is hole in file */
L
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4732 4733
	char		wasdelay;	/* old extent was delayed */
	char		wr;		/* this is a write request */
4734
	char		rt;		/* this is a realtime file */
L
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4735 4736 4737 4738 4739 4740 4741 4742 4743 4744 4745 4746 4747 4748 4749 4750 4751 4752 4753 4754 4755 4756 4757 4758 4759 4760 4761 4762
#ifdef DEBUG
	xfs_fileoff_t	orig_bno;	/* original block number value */
	int		orig_flags;	/* original flags arg value */
	xfs_filblks_t	orig_len;	/* original value of len arg */
	xfs_bmbt_irec_t	*orig_mval;	/* original value of mval */
	int		orig_nmap;	/* original value of *nmap */

	orig_bno = bno;
	orig_len = len;
	orig_flags = flags;
	orig_mval = mval;
	orig_nmap = *nmap;
#endif
	ASSERT(*nmap >= 1);
	ASSERT(*nmap <= XFS_BMAP_MAX_NMAP || !(flags & XFS_BMAPI_WRITE));
	whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
		XFS_ATTR_FORK : XFS_DATA_FORK;
	mp = ip->i_mount;
	if (unlikely(XFS_TEST_ERROR(
	    (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
	     XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
	     XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL),
	     mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) {
		XFS_ERROR_REPORT("xfs_bmapi", XFS_ERRLEVEL_LOW, mp);
		return XFS_ERROR(EFSCORRUPTED);
	}
	if (XFS_FORCED_SHUTDOWN(mp))
		return XFS_ERROR(EIO);
4763
	rt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip);
L
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4764 4765 4766 4767 4768 4769 4770 4771
	ifp = XFS_IFORK_PTR(ip, whichfork);
	ASSERT(ifp->if_ext_max ==
	       XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
	if ((wr = (flags & XFS_BMAPI_WRITE)) != 0)
		XFS_STATS_INC(xs_blk_mapw);
	else
		XFS_STATS_INC(xs_blk_mapr);
	/*
4772
	 * IGSTATE flag is used to combine extents which
L
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4773 4774 4775 4776 4777 4778 4779 4780 4781 4782 4783 4784 4785 4786 4787
	 * differ only due to the state of the extents.
	 * This technique is used from xfs_getbmap()
	 * when the caller does not wish to see the
	 * separation (which is the default).
	 *
	 * This technique is also used when writing a
	 * buffer which has been partially written,
	 * (usually by being flushed during a chunkread),
	 * to ensure one write takes place. This also
	 * prevents a change in the xfs inode extents at
	 * this time, intentionally. This change occurs
	 * on completion of the write operation, in
	 * xfs_strat_comp(), where the xfs_bmapi() call
	 * is transactioned, and the extents combined.
	 */
4788 4789 4790
	if ((flags & XFS_BMAPI_IGSTATE) && wr)	/* if writing unwritten space */
		wr = 0;				/* no allocations are allowed */
	ASSERT(wr || !(flags & XFS_BMAPI_DELAY));
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4791 4792 4793 4794 4795 4796 4797 4798 4799 4800 4801
	logflags = 0;
	nallocs = 0;
	cur = NULL;
	if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
		ASSERT(wr && tp);
		if ((error = xfs_bmap_local_to_extents(tp, ip,
				firstblock, total, &logflags, whichfork)))
			goto error0;
	}
	if (wr && *firstblock == NULLFSBLOCK) {
		if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE)
4802
			minleft = be16_to_cpu(ifp->if_broot->bb_level) + 1;
L
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4803 4804 4805 4806 4807 4808 4809 4810 4811 4812 4813 4814 4815 4816
		else
			minleft = 1;
	} else
		minleft = 0;
	if (!(ifp->if_flags & XFS_IFEXTENTS) &&
	    (error = xfs_iread_extents(tp, ip, whichfork)))
		goto error0;
	ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
		&prev);
	nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
	n = 0;
	end = bno + len;
	obno = bno;
	bma.ip = NULL;
4817 4818 4819 4820
	if (delta) {
		delta->xed_startoff = NULLFILEOFF;
		delta->xed_blockcount = 0;
	}
L
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4821 4822 4823 4824 4825 4826 4827 4828
	while (bno < end && n < *nmap) {
		/*
		 * Reading past eof, act as though there's a hole
		 * up to end.
		 */
		if (eof && !wr)
			got.br_startoff = end;
		inhole = eof || got.br_startoff > bno;
4829
		wasdelay = wr && !inhole && !(flags & XFS_BMAPI_DELAY) &&
L
Linus Torvalds 已提交
4830 4831 4832 4833 4834 4835 4836 4837 4838 4839 4840
			ISNULLSTARTBLOCK(got.br_startblock);
		/*
		 * First, deal with the hole before the allocated space
		 * that we found, if any.
		 */
		if (wr && (inhole || wasdelay)) {
			/*
			 * For the wasdelay case, we could also just
			 * allocate the stuff asked for in this bmap call
			 * but that wouldn't be as good.
			 */
4841
			if (wasdelay && !(flags & XFS_BMAPI_EXACT)) {
L
Linus Torvalds 已提交
4842 4843 4844
				alen = (xfs_extlen_t)got.br_blockcount;
				aoff = got.br_startoff;
				if (lastx != NULLEXTNUM && lastx) {
4845
					ep = xfs_iext_get_ext(ifp, lastx - 1);
L
Linus Torvalds 已提交
4846 4847 4848 4849 4850 4851 4852 4853 4854 4855 4856 4857 4858 4859 4860 4861 4862
					xfs_bmbt_get_all(ep, &prev);
				}
			} else if (wasdelay) {
				alen = (xfs_extlen_t)
					XFS_FILBLKS_MIN(len,
						(got.br_startoff +
						 got.br_blockcount) - bno);
				aoff = bno;
			} else {
				alen = (xfs_extlen_t)
					XFS_FILBLKS_MIN(len, MAXEXTLEN);
				if (!eof)
					alen = (xfs_extlen_t)
						XFS_FILBLKS_MIN(alen,
							got.br_startoff - bno);
				aoff = bno;
			}
4863 4864
			minlen = (flags & XFS_BMAPI_CONTIG) ? alen : 1;
			if (flags & XFS_BMAPI_DELAY) {
4865
				xfs_extlen_t	extsz;
4866 4867

				/* Figure out the extent size, adjust alen */
4868
				extsz = xfs_get_extsz_hint(ip);
4869 4870 4871
				if (extsz) {
					error = xfs_bmap_extsize_align(mp,
							&got, &prev, extsz,
4872 4873 4874
							rt, eof,
							flags&XFS_BMAPI_DELAY,
							flags&XFS_BMAPI_CONVERT,
4875 4876
							&aoff, &alen);
					ASSERT(!error);
4877 4878
				}

4879 4880 4881
				if (rt)
					extsz = alen / mp->m_sb.sb_rextsize;

L
Linus Torvalds 已提交
4882 4883 4884
				/*
				 * Make a transaction-less quota reservation for
				 * delayed allocation blocks. This number gets
4885 4886
				 * adjusted later.  We return if we haven't
				 * allocated blocks already inside this loop.
L
Linus Torvalds 已提交
4887
				 */
4888
				if ((error = XFS_TRANS_RESERVE_QUOTA_NBLKS(
4889 4890
						mp, NULL, ip, (long)alen, 0,
						rt ? XFS_QMOPT_RES_RTBLKS :
4891
						     XFS_QMOPT_RES_REGBLKS))) {
L
Linus Torvalds 已提交
4892 4893 4894
					if (n == 0) {
						*nmap = 0;
						ASSERT(cur == NULL);
4895
						return error;
L
Linus Torvalds 已提交
4896 4897 4898 4899 4900 4901 4902 4903
					}
					break;
				}

				/*
				 * Split changing sb for alen and indlen since
				 * they could be coming from different places.
				 */
4904 4905 4906
				indlen = (xfs_extlen_t)
					xfs_bmap_worst_indlen(ip, alen);
				ASSERT(indlen > 0);
L
Linus Torvalds 已提交
4907

4908
				if (rt) {
4909 4910
					error = xfs_mod_incore_sb(mp,
							XFS_SBS_FREXTENTS,
4911
							-((int64_t)extsz), (flags &
4912
							XFS_BMAPI_RSVBLOCKS));
4913
				} else {
4914 4915
					error = xfs_mod_incore_sb(mp,
							XFS_SBS_FDBLOCKS,
4916
							-((int64_t)alen), (flags &
4917
							XFS_BMAPI_RSVBLOCKS));
4918
				}
4919
				if (!error) {
4920 4921
					error = xfs_mod_incore_sb(mp,
							XFS_SBS_FDBLOCKS,
4922
							-((int64_t)indlen), (flags &
4923
							XFS_BMAPI_RSVBLOCKS));
4924 4925
					if (error && rt)
						xfs_mod_incore_sb(mp,
4926
							XFS_SBS_FREXTENTS,
4927
							(int64_t)extsz, (flags &
4928
							XFS_BMAPI_RSVBLOCKS));
4929 4930
					else if (error)
						xfs_mod_incore_sb(mp,
4931
							XFS_SBS_FDBLOCKS,
4932
							(int64_t)alen, (flags &
4933
							XFS_BMAPI_RSVBLOCKS));
4934
				}
4935 4936

				if (error) {
4937
					if (XFS_IS_QUOTA_ON(mp))
4938
						/* unreserve the blocks now */
4939
						(void)
4940 4941 4942 4943 4944
						XFS_TRANS_UNRESERVE_QUOTA_NBLKS(
							mp, NULL, ip,
							(long)alen, 0, rt ?
							XFS_QMOPT_RES_RTBLKS :
							XFS_QMOPT_RES_REGBLKS);
L
Linus Torvalds 已提交
4945 4946
					break;
				}
4947

L
Linus Torvalds 已提交
4948 4949 4950 4951 4952 4953 4954 4955 4956 4957 4958 4959 4960 4961 4962 4963 4964 4965
				ip->i_delayed_blks += alen;
				abno = NULLSTARTBLOCK(indlen);
			} else {
				/*
				 * If first time, allocate and fill in
				 * once-only bma fields.
				 */
				if (bma.ip == NULL) {
					bma.tp = tp;
					bma.ip = ip;
					bma.prevp = &prev;
					bma.gotp = &got;
					bma.total = total;
					bma.userdata = 0;
				}
				/* Indicate if this is the first user data
				 * in the file, or just any user data.
				 */
4966
				if (!(flags & XFS_BMAPI_METADATA)) {
L
Linus Torvalds 已提交
4967 4968 4969 4970 4971 4972 4973 4974 4975 4976 4977
					bma.userdata = (aoff == 0) ?
						XFS_ALLOC_INITIAL_USER_DATA :
						XFS_ALLOC_USERDATA;
				}
				/*
				 * Fill in changeable bma fields.
				 */
				bma.eof = eof;
				bma.firstblock = *firstblock;
				bma.alen = alen;
				bma.off = aoff;
4978
				bma.conv = !!(flags & XFS_BMAPI_CONVERT);
L
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4979 4980 4981 4982 4983 4984 4985 4986 4987 4988
				bma.wasdel = wasdelay;
				bma.minlen = minlen;
				bma.low = flist->xbf_low;
				bma.minleft = minleft;
				/*
				 * Only want to do the alignment at the
				 * eof if it is userdata and allocation length
				 * is larger than a stripe unit.
				 */
				if (mp->m_dalign && alen >= mp->m_dalign &&
4989 4990
				    (!(flags & XFS_BMAPI_METADATA)) &&
				    (whichfork == XFS_DATA_FORK)) {
L
Linus Torvalds 已提交
4991 4992 4993 4994 4995 4996 4997 4998 4999 5000 5001 5002 5003 5004 5005 5006 5007 5008 5009 5010 5011 5012 5013 5014 5015 5016 5017 5018 5019 5020 5021 5022 5023 5024 5025 5026 5027 5028 5029 5030 5031 5032 5033 5034 5035 5036 5037 5038 5039 5040 5041 5042 5043 5044 5045 5046 5047 5048 5049 5050 5051
					if ((error = xfs_bmap_isaeof(ip, aoff,
							whichfork, &bma.aeof)))
						goto error0;
				} else
					bma.aeof = 0;
				/*
				 * Call allocator.
				 */
				if ((error = xfs_bmap_alloc(&bma)))
					goto error0;
				/*
				 * Copy out result fields.
				 */
				abno = bma.rval;
				if ((flist->xbf_low = bma.low))
					minleft = 0;
				alen = bma.alen;
				aoff = bma.off;
				ASSERT(*firstblock == NULLFSBLOCK ||
				       XFS_FSB_TO_AGNO(mp, *firstblock) ==
				       XFS_FSB_TO_AGNO(mp, bma.firstblock) ||
				       (flist->xbf_low &&
					XFS_FSB_TO_AGNO(mp, *firstblock) <
					XFS_FSB_TO_AGNO(mp, bma.firstblock)));
				*firstblock = bma.firstblock;
				if (cur)
					cur->bc_private.b.firstblock =
						*firstblock;
				if (abno == NULLFSBLOCK)
					break;
				if ((ifp->if_flags & XFS_IFBROOT) && !cur) {
					cur = xfs_btree_init_cursor(mp,
						tp, NULL, 0, XFS_BTNUM_BMAP,
						ip, whichfork);
					cur->bc_private.b.firstblock =
						*firstblock;
					cur->bc_private.b.flist = flist;
				}
				/*
				 * Bump the number of extents we've allocated
				 * in this call.
				 */
				nallocs++;
			}
			if (cur)
				cur->bc_private.b.flags =
					wasdelay ? XFS_BTCUR_BPRV_WASDEL : 0;
			got.br_startoff = aoff;
			got.br_startblock = abno;
			got.br_blockcount = alen;
			got.br_state = XFS_EXT_NORM;	/* assume normal */
			/*
			 * Determine state of extent, and the filesystem.
			 * A wasdelay extent has been initialized, so
			 * shouldn't be flagged as unwritten.
			 */
			if (wr && XFS_SB_VERSION_HASEXTFLGBIT(&mp->m_sb)) {
				if (!wasdelay && (flags & XFS_BMAPI_PREALLOC))
					got.br_state = XFS_EXT_UNWRITTEN;
			}
			error = xfs_bmap_add_extent(ip, lastx, &cur, &got,
5052 5053
				firstblock, flist, &tmp_logflags, delta,
				whichfork, (flags & XFS_BMAPI_RSVBLOCKS));
L
Linus Torvalds 已提交
5054 5055 5056 5057
			logflags |= tmp_logflags;
			if (error)
				goto error0;
			lastx = ifp->if_lastex;
5058
			ep = xfs_iext_get_ext(ifp, lastx);
L
Linus Torvalds 已提交
5059 5060 5061 5062 5063 5064
			nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
			xfs_bmbt_get_all(ep, &got);
			ASSERT(got.br_startoff <= aoff);
			ASSERT(got.br_startoff + got.br_blockcount >=
				aoff + alen);
#ifdef DEBUG
5065
			if (flags & XFS_BMAPI_DELAY) {
L
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5066 5067 5068 5069 5070 5071 5072 5073 5074 5075 5076 5077 5078 5079 5080 5081 5082 5083 5084 5085 5086 5087 5088 5089 5090 5091 5092 5093
				ASSERT(ISNULLSTARTBLOCK(got.br_startblock));
				ASSERT(STARTBLOCKVAL(got.br_startblock) > 0);
			}
			ASSERT(got.br_state == XFS_EXT_NORM ||
			       got.br_state == XFS_EXT_UNWRITTEN);
#endif
			/*
			 * Fall down into the found allocated space case.
			 */
		} else if (inhole) {
			/*
			 * Reading in a hole.
			 */
			mval->br_startoff = bno;
			mval->br_startblock = HOLESTARTBLOCK;
			mval->br_blockcount =
				XFS_FILBLKS_MIN(len, got.br_startoff - bno);
			mval->br_state = XFS_EXT_NORM;
			bno += mval->br_blockcount;
			len -= mval->br_blockcount;
			mval++;
			n++;
			continue;
		}
		/*
		 * Then deal with the allocated space we found.
		 */
		ASSERT(ep != NULL);
5094 5095
		if (!(flags & XFS_BMAPI_ENTIRE) &&
		    (got.br_startoff + got.br_blockcount > obno)) {
L
Linus Torvalds 已提交
5096 5097 5098 5099 5100 5101
			if (obno > bno)
				bno = obno;
			ASSERT((bno >= obno) || (n == 0));
			ASSERT(bno < end);
			mval->br_startoff = bno;
			if (ISNULLSTARTBLOCK(got.br_startblock)) {
5102
				ASSERT(!wr || (flags & XFS_BMAPI_DELAY));
L
Linus Torvalds 已提交
5103 5104 5105 5106 5107 5108 5109 5110 5111 5112 5113 5114 5115 5116 5117 5118 5119 5120 5121 5122 5123
				mval->br_startblock = DELAYSTARTBLOCK;
			} else
				mval->br_startblock =
					got.br_startblock +
					(bno - got.br_startoff);
			/*
			 * Return the minimum of what we got and what we
			 * asked for for the length.  We can use the len
			 * variable here because it is modified below
			 * and we could have been there before coming
			 * here if the first part of the allocation
			 * didn't overlap what was asked for.
			 */
			mval->br_blockcount =
				XFS_FILBLKS_MIN(end - bno, got.br_blockcount -
					(bno - got.br_startoff));
			mval->br_state = got.br_state;
			ASSERT(mval->br_blockcount <= len);
		} else {
			*mval = got;
			if (ISNULLSTARTBLOCK(mval->br_startblock)) {
5124
				ASSERT(!wr || (flags & XFS_BMAPI_DELAY));
L
Linus Torvalds 已提交
5125 5126 5127 5128 5129 5130 5131 5132 5133 5134 5135 5136 5137 5138 5139 5140 5141 5142 5143 5144 5145 5146 5147 5148
				mval->br_startblock = DELAYSTARTBLOCK;
			}
		}

		/*
		 * Check if writing previously allocated but
		 * unwritten extents.
		 */
		if (wr && mval->br_state == XFS_EXT_UNWRITTEN &&
		    ((flags & (XFS_BMAPI_PREALLOC|XFS_BMAPI_DELAY)) == 0)) {
			/*
			 * Modify (by adding) the state flag, if writing.
			 */
			ASSERT(mval->br_blockcount <= len);
			if ((ifp->if_flags & XFS_IFBROOT) && !cur) {
				cur = xfs_btree_init_cursor(mp,
					tp, NULL, 0, XFS_BTNUM_BMAP,
					ip, whichfork);
				cur->bc_private.b.firstblock =
					*firstblock;
				cur->bc_private.b.flist = flist;
			}
			mval->br_state = XFS_EXT_NORM;
			error = xfs_bmap_add_extent(ip, lastx, &cur, mval,
5149 5150
				firstblock, flist, &tmp_logflags, delta,
				whichfork, (flags & XFS_BMAPI_RSVBLOCKS));
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5151 5152 5153 5154
			logflags |= tmp_logflags;
			if (error)
				goto error0;
			lastx = ifp->if_lastex;
5155
			ep = xfs_iext_get_ext(ifp, lastx);
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5156 5157 5158 5159 5160 5161 5162 5163 5164 5165 5166
			nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
			xfs_bmbt_get_all(ep, &got);
			/*
			 * We may have combined previously unwritten
			 * space with written space, so generate
			 * another request.
			 */
			if (mval->br_blockcount < len)
				continue;
		}

5167
		ASSERT((flags & XFS_BMAPI_ENTIRE) ||
L
Linus Torvalds 已提交
5168
		       ((mval->br_startoff + mval->br_blockcount) <= end));
5169 5170
		ASSERT((flags & XFS_BMAPI_ENTIRE) ||
		       (mval->br_blockcount <= len) ||
L
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5171 5172 5173 5174 5175 5176 5177 5178 5179 5180 5181 5182 5183 5184
		       (mval->br_startoff < obno));
		bno = mval->br_startoff + mval->br_blockcount;
		len = end - bno;
		if (n > 0 && mval->br_startoff == mval[-1].br_startoff) {
			ASSERT(mval->br_startblock == mval[-1].br_startblock);
			ASSERT(mval->br_blockcount > mval[-1].br_blockcount);
			ASSERT(mval->br_state == mval[-1].br_state);
			mval[-1].br_blockcount = mval->br_blockcount;
			mval[-1].br_state = mval->br_state;
		} else if (n > 0 && mval->br_startblock != DELAYSTARTBLOCK &&
			   mval[-1].br_startblock != DELAYSTARTBLOCK &&
			   mval[-1].br_startblock != HOLESTARTBLOCK &&
			   mval->br_startblock ==
			   mval[-1].br_startblock + mval[-1].br_blockcount &&
5185 5186
			   ((flags & XFS_BMAPI_IGSTATE) ||
				mval[-1].br_state == mval->br_state)) {
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			ASSERT(mval->br_startoff ==
			       mval[-1].br_startoff + mval[-1].br_blockcount);
			mval[-1].br_blockcount += mval->br_blockcount;
		} else if (n > 0 &&
			   mval->br_startblock == DELAYSTARTBLOCK &&
			   mval[-1].br_startblock == DELAYSTARTBLOCK &&
			   mval->br_startoff ==
			   mval[-1].br_startoff + mval[-1].br_blockcount) {
			mval[-1].br_blockcount += mval->br_blockcount;
			mval[-1].br_state = mval->br_state;
		} else if (!((n == 0) &&
			     ((mval->br_startoff + mval->br_blockcount) <=
			      obno))) {
			mval++;
			n++;
		}
		/*
		 * If we're done, stop now.  Stop when we've allocated
		 * XFS_BMAP_MAX_NMAP extents no matter what.  Otherwise
		 * the transaction may get too big.
		 */
		if (bno >= end || n >= *nmap || nallocs >= *nmap)
			break;
		/*
		 * Else go on to the next record.
		 */
5213
		ep = xfs_iext_get_ext(ifp, ++lastx);
5214 5215
		prev = got;
		if (lastx >= nextents)
L
Linus Torvalds 已提交
5216
			eof = 1;
5217
		else
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			xfs_bmbt_get_all(ep, &got);
	}
	ifp->if_lastex = lastx;
	*nmap = n;
	/*
	 * Transform from btree to extents, give it cur.
	 */
	if (tp && XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE &&
	    XFS_IFORK_NEXTENTS(ip, whichfork) <= ifp->if_ext_max) {
		ASSERT(wr && cur);
		error = xfs_bmap_btree_to_extents(tp, ip, cur,
			&tmp_logflags, whichfork);
		logflags |= tmp_logflags;
		if (error)
			goto error0;
	}
	ASSERT(ifp->if_ext_max ==
	       XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
	ASSERT(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE ||
	       XFS_IFORK_NEXTENTS(ip, whichfork) > ifp->if_ext_max);
	error = 0;
5239 5240 5241 5242 5243 5244 5245 5246
	if (delta && delta->xed_startoff != NULLFILEOFF) {
		/* A change was actually made.
		 * Note that delta->xed_blockount is an offset at this
		 * point and needs to be converted to a block count.
		 */
		ASSERT(delta->xed_blockcount > delta->xed_startoff);
		delta->xed_blockcount -= delta->xed_startoff;
	}
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error0:
	/*
	 * Log everything.  Do this after conversion, there's no point in
5250
	 * logging the extent records if we've converted to btree format.
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	 */
	if ((logflags & XFS_ILOG_FEXT(whichfork)) &&
	    XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
		logflags &= ~XFS_ILOG_FEXT(whichfork);
	else if ((logflags & XFS_ILOG_FBROOT(whichfork)) &&
		 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)
		logflags &= ~XFS_ILOG_FBROOT(whichfork);
	/*
	 * Log whatever the flags say, even if error.  Otherwise we might miss
	 * detecting a case where the data is changed, there's an error,
	 * and it's not logged so we don't shutdown when we should.
	 */
	if (logflags) {
		ASSERT(tp && wr);
		xfs_trans_log_inode(tp, ip, logflags);
	}
	if (cur) {
		if (!error) {
			ASSERT(*firstblock == NULLFSBLOCK ||
			       XFS_FSB_TO_AGNO(mp, *firstblock) ==
			       XFS_FSB_TO_AGNO(mp,
				       cur->bc_private.b.firstblock) ||
			       (flist->xbf_low &&
				XFS_FSB_TO_AGNO(mp, *firstblock) <
				XFS_FSB_TO_AGNO(mp,
					cur->bc_private.b.firstblock)));
			*firstblock = cur->bc_private.b.firstblock;
		}
		xfs_btree_del_cursor(cur,
			error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
	}
	if (!error)
		xfs_bmap_validate_ret(orig_bno, orig_len, orig_flags, orig_mval,
			orig_nmap, *nmap);
	return error;
}

/*
 * Map file blocks to filesystem blocks, simple version.
 * One block (extent) only, read-only.
 * For flags, only the XFS_BMAPI_ATTRFORK flag is examined.
 * For the other flag values, the effect is as if XFS_BMAPI_METADATA
 * was set and all the others were clear.
 */
int						/* error */
xfs_bmapi_single(
	xfs_trans_t	*tp,		/* transaction pointer */
	xfs_inode_t	*ip,		/* incore inode */
	int		whichfork,	/* data or attr fork */
	xfs_fsblock_t	*fsb,		/* output: mapped block */
	xfs_fileoff_t	bno)		/* starting file offs. mapped */
{
5303
	int		eof;		/* we've hit the end of extents */
L
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5304
	int		error;		/* error return */
5305
	xfs_bmbt_irec_t	got;		/* current file extent record */
L
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5306 5307
	xfs_ifork_t	*ifp;		/* inode fork pointer */
	xfs_extnum_t	lastx;		/* last useful extent number */
5308
	xfs_bmbt_irec_t	prev;		/* previous file extent record */
L
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5309 5310 5311 5312 5313 5314 5315 5316 5317 5318 5319 5320 5321 5322 5323 5324 5325 5326 5327 5328 5329 5330 5331 5332 5333 5334 5335 5336 5337 5338 5339 5340 5341 5342 5343 5344 5345 5346 5347 5348 5349 5350 5351 5352 5353 5354 5355 5356 5357

	ifp = XFS_IFORK_PTR(ip, whichfork);
	if (unlikely(
	    XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
	    XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)) {
	       XFS_ERROR_REPORT("xfs_bmapi_single", XFS_ERRLEVEL_LOW,
				ip->i_mount);
	       return XFS_ERROR(EFSCORRUPTED);
	}
	if (XFS_FORCED_SHUTDOWN(ip->i_mount))
		return XFS_ERROR(EIO);
	XFS_STATS_INC(xs_blk_mapr);
	if (!(ifp->if_flags & XFS_IFEXTENTS) &&
	    (error = xfs_iread_extents(tp, ip, whichfork)))
		return error;
	(void)xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
		&prev);
	/*
	 * Reading past eof, act as though there's a hole
	 * up to end.
	 */
	if (eof || got.br_startoff > bno) {
		*fsb = NULLFSBLOCK;
		return 0;
	}
	ASSERT(!ISNULLSTARTBLOCK(got.br_startblock));
	ASSERT(bno < got.br_startoff + got.br_blockcount);
	*fsb = got.br_startblock + (bno - got.br_startoff);
	ifp->if_lastex = lastx;
	return 0;
}

/*
 * Unmap (remove) blocks from a file.
 * If nexts is nonzero then the number of extents to remove is limited to
 * that value.  If not all extents in the block range can be removed then
 * *done is set.
 */
int						/* error */
xfs_bunmapi(
	xfs_trans_t		*tp,		/* transaction pointer */
	struct xfs_inode	*ip,		/* incore inode */
	xfs_fileoff_t		bno,		/* starting offset to unmap */
	xfs_filblks_t		len,		/* length to unmap in file */
	int			flags,		/* misc flags */
	xfs_extnum_t		nexts,		/* number of extents max */
	xfs_fsblock_t		*firstblock,	/* first allocated block
						   controls a.g. for allocs */
	xfs_bmap_free_t		*flist,		/* i/o: list extents to free */
5358 5359
	xfs_extdelta_t		*delta,		/* o: change made to incore
						   extents */
L
Linus Torvalds 已提交
5360 5361 5362 5363 5364
	int			*done)		/* set if not done yet */
{
	xfs_btree_cur_t		*cur;		/* bmap btree cursor */
	xfs_bmbt_irec_t		del;		/* extent being deleted */
	int			eof;		/* is deleting at eof */
5365
	xfs_bmbt_rec_host_t	*ep;		/* extent record pointer */
L
Linus Torvalds 已提交
5366 5367
	int			error;		/* error return value */
	xfs_extnum_t		extno;		/* extent number in list */
5368
	xfs_bmbt_irec_t		got;		/* current extent record */
L
Linus Torvalds 已提交
5369 5370 5371 5372 5373 5374
	xfs_ifork_t		*ifp;		/* inode fork pointer */
	int			isrt;		/* freeing in rt area */
	xfs_extnum_t		lastx;		/* last extent index used */
	int			logflags;	/* transaction logging flags */
	xfs_extlen_t		mod;		/* rt extent offset */
	xfs_mount_t		*mp;		/* mount structure */
5375 5376
	xfs_extnum_t		nextents;	/* number of file extents */
	xfs_bmbt_irec_t		prev;		/* previous extent record */
L
Linus Torvalds 已提交
5377 5378 5379 5380 5381 5382 5383 5384 5385 5386 5387 5388 5389 5390 5391 5392 5393 5394 5395 5396 5397 5398 5399 5400 5401 5402 5403 5404 5405 5406 5407 5408 5409 5410 5411
	xfs_fileoff_t		start;		/* first file offset deleted */
	int			tmp_logflags;	/* partial logging flags */
	int			wasdel;		/* was a delayed alloc extent */
	int			whichfork;	/* data or attribute fork */
	int			rsvd;		/* OK to allocate reserved blocks */
	xfs_fsblock_t		sum;

	xfs_bunmap_trace(ip, bno, len, flags, (inst_t *)__return_address);
	whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
		XFS_ATTR_FORK : XFS_DATA_FORK;
	ifp = XFS_IFORK_PTR(ip, whichfork);
	if (unlikely(
	    XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
	    XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)) {
		XFS_ERROR_REPORT("xfs_bunmapi", XFS_ERRLEVEL_LOW,
				 ip->i_mount);
		return XFS_ERROR(EFSCORRUPTED);
	}
	mp = ip->i_mount;
	if (XFS_FORCED_SHUTDOWN(mp))
		return XFS_ERROR(EIO);
	rsvd = (flags & XFS_BMAPI_RSVBLOCKS) != 0;
	ASSERT(len > 0);
	ASSERT(nexts >= 0);
	ASSERT(ifp->if_ext_max ==
	       XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
	if (!(ifp->if_flags & XFS_IFEXTENTS) &&
	    (error = xfs_iread_extents(tp, ip, whichfork)))
		return error;
	nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
	if (nextents == 0) {
		*done = 1;
		return 0;
	}
	XFS_STATS_INC(xs_blk_unmap);
5412
	isrt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip);
L
Linus Torvalds 已提交
5413 5414 5415 5416
	start = bno;
	bno = start + len - 1;
	ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
		&prev);
5417 5418 5419 5420
	if (delta) {
		delta->xed_startoff = NULLFILEOFF;
		delta->xed_blockcount = 0;
	}
L
Linus Torvalds 已提交
5421 5422 5423 5424 5425
	/*
	 * Check to see if the given block number is past the end of the
	 * file, back up to the last block if so...
	 */
	if (eof) {
5426
		ep = xfs_iext_get_ext(ifp, --lastx);
L
Linus Torvalds 已提交
5427 5428 5429 5430 5431 5432 5433 5434 5435 5436 5437 5438 5439 5440 5441 5442 5443 5444 5445 5446 5447 5448 5449
		xfs_bmbt_get_all(ep, &got);
		bno = got.br_startoff + got.br_blockcount - 1;
	}
	logflags = 0;
	if (ifp->if_flags & XFS_IFBROOT) {
		ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE);
		cur = xfs_btree_init_cursor(mp, tp, NULL, 0, XFS_BTNUM_BMAP, ip,
			whichfork);
		cur->bc_private.b.firstblock = *firstblock;
		cur->bc_private.b.flist = flist;
		cur->bc_private.b.flags = 0;
	} else
		cur = NULL;
	extno = 0;
	while (bno != (xfs_fileoff_t)-1 && bno >= start && lastx >= 0 &&
	       (nexts == 0 || extno < nexts)) {
		/*
		 * Is the found extent after a hole in which bno lives?
		 * Just back up to the previous extent, if so.
		 */
		if (got.br_startoff > bno) {
			if (--lastx < 0)
				break;
5450
			ep = xfs_iext_get_ext(ifp, lastx);
L
Linus Torvalds 已提交
5451 5452 5453 5454 5455 5456 5457 5458 5459 5460 5461 5462 5463 5464 5465 5466 5467 5468 5469 5470 5471 5472 5473 5474 5475 5476 5477 5478 5479 5480 5481 5482 5483 5484 5485 5486 5487 5488 5489 5490 5491 5492 5493 5494 5495 5496
			xfs_bmbt_get_all(ep, &got);
		}
		/*
		 * Is the last block of this extent before the range
		 * we're supposed to delete?  If so, we're done.
		 */
		bno = XFS_FILEOFF_MIN(bno,
			got.br_startoff + got.br_blockcount - 1);
		if (bno < start)
			break;
		/*
		 * Then deal with the (possibly delayed) allocated space
		 * we found.
		 */
		ASSERT(ep != NULL);
		del = got;
		wasdel = ISNULLSTARTBLOCK(del.br_startblock);
		if (got.br_startoff < start) {
			del.br_startoff = start;
			del.br_blockcount -= start - got.br_startoff;
			if (!wasdel)
				del.br_startblock += start - got.br_startoff;
		}
		if (del.br_startoff + del.br_blockcount > bno + 1)
			del.br_blockcount = bno + 1 - del.br_startoff;
		sum = del.br_startblock + del.br_blockcount;
		if (isrt &&
		    (mod = do_mod(sum, mp->m_sb.sb_rextsize))) {
			/*
			 * Realtime extent not lined up at the end.
			 * The extent could have been split into written
			 * and unwritten pieces, or we could just be
			 * unmapping part of it.  But we can't really
			 * get rid of part of a realtime extent.
			 */
			if (del.br_state == XFS_EXT_UNWRITTEN ||
			    !XFS_SB_VERSION_HASEXTFLGBIT(&mp->m_sb)) {
				/*
				 * This piece is unwritten, or we're not
				 * using unwritten extents.  Skip over it.
				 */
				ASSERT(bno >= mod);
				bno -= mod > del.br_blockcount ?
					del.br_blockcount : mod;
				if (bno < got.br_startoff) {
					if (--lastx >= 0)
5497 5498
						xfs_bmbt_get_all(xfs_iext_get_ext(
							ifp, lastx), &got);
L
Linus Torvalds 已提交
5499 5500 5501 5502 5503 5504 5505 5506 5507 5508 5509 5510 5511 5512 5513 5514 5515 5516 5517 5518
				}
				continue;
			}
			/*
			 * It's written, turn it unwritten.
			 * This is better than zeroing it.
			 */
			ASSERT(del.br_state == XFS_EXT_NORM);
			ASSERT(xfs_trans_get_block_res(tp) > 0);
			/*
			 * If this spans a realtime extent boundary,
			 * chop it back to the start of the one we end at.
			 */
			if (del.br_blockcount > mod) {
				del.br_startoff += del.br_blockcount - mod;
				del.br_startblock += del.br_blockcount - mod;
				del.br_blockcount = mod;
			}
			del.br_state = XFS_EXT_UNWRITTEN;
			error = xfs_bmap_add_extent(ip, lastx, &cur, &del,
5519 5520
				firstblock, flist, &logflags, delta,
				XFS_DATA_FORK, 0);
L
Linus Torvalds 已提交
5521 5522 5523 5524 5525 5526 5527 5528 5529 5530 5531 5532 5533 5534 5535 5536 5537 5538 5539 5540 5541 5542 5543 5544 5545 5546 5547 5548 5549 5550 5551 5552 5553 5554 5555 5556 5557 5558
			if (error)
				goto error0;
			goto nodelete;
		}
		if (isrt && (mod = do_mod(del.br_startblock, mp->m_sb.sb_rextsize))) {
			/*
			 * Realtime extent is lined up at the end but not
			 * at the front.  We'll get rid of full extents if
			 * we can.
			 */
			mod = mp->m_sb.sb_rextsize - mod;
			if (del.br_blockcount > mod) {
				del.br_blockcount -= mod;
				del.br_startoff += mod;
				del.br_startblock += mod;
			} else if ((del.br_startoff == start &&
				    (del.br_state == XFS_EXT_UNWRITTEN ||
				     xfs_trans_get_block_res(tp) == 0)) ||
				   !XFS_SB_VERSION_HASEXTFLGBIT(&mp->m_sb)) {
				/*
				 * Can't make it unwritten.  There isn't
				 * a full extent here so just skip it.
				 */
				ASSERT(bno >= del.br_blockcount);
				bno -= del.br_blockcount;
				if (bno < got.br_startoff) {
					if (--lastx >= 0)
						xfs_bmbt_get_all(--ep, &got);
				}
				continue;
			} else if (del.br_state == XFS_EXT_UNWRITTEN) {
				/*
				 * This one is already unwritten.
				 * It must have a written left neighbor.
				 * Unwrite the killed part of that one and
				 * try again.
				 */
				ASSERT(lastx > 0);
5559 5560
				xfs_bmbt_get_all(xfs_iext_get_ext(ifp,
						lastx - 1), &prev);
L
Linus Torvalds 已提交
5561 5562 5563 5564 5565 5566 5567 5568 5569 5570 5571 5572 5573
				ASSERT(prev.br_state == XFS_EXT_NORM);
				ASSERT(!ISNULLSTARTBLOCK(prev.br_startblock));
				ASSERT(del.br_startblock ==
				       prev.br_startblock + prev.br_blockcount);
				if (prev.br_startoff < start) {
					mod = start - prev.br_startoff;
					prev.br_blockcount -= mod;
					prev.br_startblock += mod;
					prev.br_startoff = start;
				}
				prev.br_state = XFS_EXT_UNWRITTEN;
				error = xfs_bmap_add_extent(ip, lastx - 1, &cur,
					&prev, firstblock, flist, &logflags,
5574
					delta, XFS_DATA_FORK, 0);
L
Linus Torvalds 已提交
5575 5576 5577 5578 5579 5580 5581 5582
				if (error)
					goto error0;
				goto nodelete;
			} else {
				ASSERT(del.br_state == XFS_EXT_NORM);
				del.br_state = XFS_EXT_UNWRITTEN;
				error = xfs_bmap_add_extent(ip, lastx, &cur,
					&del, firstblock, flist, &logflags,
5583
					delta, XFS_DATA_FORK, 0);
L
Linus Torvalds 已提交
5584 5585 5586 5587 5588 5589 5590
				if (error)
					goto error0;
				goto nodelete;
			}
		}
		if (wasdel) {
			ASSERT(STARTBLOCKVAL(del.br_startblock) > 0);
5591
			/* Update realtime/data freespace, unreserve quota */
5592 5593 5594 5595 5596 5597
			if (isrt) {
				xfs_filblks_t rtexts;

				rtexts = XFS_FSB_TO_B(mp, del.br_blockcount);
				do_div(rtexts, mp->m_sb.sb_rextsize);
				xfs_mod_incore_sb(mp, XFS_SBS_FREXTENTS,
5598
						(int64_t)rtexts, rsvd);
5599 5600
				(void)XFS_TRANS_RESERVE_QUOTA_NBLKS(mp,
					NULL, ip, -((long)del.br_blockcount), 0,
5601 5602 5603
					XFS_QMOPT_RES_RTBLKS);
			} else {
				xfs_mod_incore_sb(mp, XFS_SBS_FDBLOCKS,
5604
						(int64_t)del.br_blockcount, rsvd);
5605 5606
				(void)XFS_TRANS_RESERVE_QUOTA_NBLKS(mp,
					NULL, ip, -((long)del.br_blockcount), 0,
L
Linus Torvalds 已提交
5607
					XFS_QMOPT_RES_REGBLKS);
5608
			}
L
Linus Torvalds 已提交
5609 5610 5611 5612 5613 5614 5615 5616 5617 5618 5619 5620 5621 5622 5623 5624 5625 5626 5627 5628 5629 5630 5631 5632 5633 5634 5635
			ip->i_delayed_blks -= del.br_blockcount;
			if (cur)
				cur->bc_private.b.flags |=
					XFS_BTCUR_BPRV_WASDEL;
		} else if (cur)
			cur->bc_private.b.flags &= ~XFS_BTCUR_BPRV_WASDEL;
		/*
		 * If it's the case where the directory code is running
		 * with no block reservation, and the deleted block is in
		 * the middle of its extent, and the resulting insert
		 * of an extent would cause transformation to btree format,
		 * then reject it.  The calling code will then swap
		 * blocks around instead.
		 * We have to do this now, rather than waiting for the
		 * conversion to btree format, since the transaction
		 * will be dirty.
		 */
		if (!wasdel && xfs_trans_get_block_res(tp) == 0 &&
		    XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
		    XFS_IFORK_NEXTENTS(ip, whichfork) >= ifp->if_ext_max &&
		    del.br_startoff > got.br_startoff &&
		    del.br_startoff + del.br_blockcount <
		    got.br_startoff + got.br_blockcount) {
			error = XFS_ERROR(ENOSPC);
			goto error0;
		}
		error = xfs_bmap_del_extent(ip, tp, lastx, flist, cur, &del,
5636
				&tmp_logflags, delta, whichfork, rsvd);
L
Linus Torvalds 已提交
5637 5638 5639 5640 5641 5642 5643 5644 5645 5646
		logflags |= tmp_logflags;
		if (error)
			goto error0;
		bno = del.br_startoff - 1;
nodelete:
		lastx = ifp->if_lastex;
		/*
		 * If not done go on to the next (previous) record.
		 * Reset ep in case the extents array was re-alloced.
		 */
5647
		ep = xfs_iext_get_ext(ifp, lastx);
L
Linus Torvalds 已提交
5648 5649 5650
		if (bno != (xfs_fileoff_t)-1 && bno >= start) {
			if (lastx >= XFS_IFORK_NEXTENTS(ip, whichfork) ||
			    xfs_bmbt_get_startoff(ep) > bno) {
5651 5652
				if (--lastx >= 0)
					ep = xfs_iext_get_ext(ifp, lastx);
L
Linus Torvalds 已提交
5653 5654 5655 5656 5657 5658 5659 5660 5661 5662 5663 5664 5665 5666 5667 5668 5669 5670 5671 5672 5673 5674 5675 5676 5677 5678 5679 5680 5681 5682 5683 5684 5685 5686 5687 5688 5689 5690 5691 5692
			}
			if (lastx >= 0)
				xfs_bmbt_get_all(ep, &got);
			extno++;
		}
	}
	ifp->if_lastex = lastx;
	*done = bno == (xfs_fileoff_t)-1 || bno < start || lastx < 0;
	ASSERT(ifp->if_ext_max ==
	       XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
	/*
	 * Convert to a btree if necessary.
	 */
	if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
	    XFS_IFORK_NEXTENTS(ip, whichfork) > ifp->if_ext_max) {
		ASSERT(cur == NULL);
		error = xfs_bmap_extents_to_btree(tp, ip, firstblock, flist,
			&cur, 0, &tmp_logflags, whichfork);
		logflags |= tmp_logflags;
		if (error)
			goto error0;
	}
	/*
	 * transform from btree to extents, give it cur
	 */
	else if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE &&
		 XFS_IFORK_NEXTENTS(ip, whichfork) <= ifp->if_ext_max) {
		ASSERT(cur != NULL);
		error = xfs_bmap_btree_to_extents(tp, ip, cur, &tmp_logflags,
			whichfork);
		logflags |= tmp_logflags;
		if (error)
			goto error0;
	}
	/*
	 * transform from extents to local?
	 */
	ASSERT(ifp->if_ext_max ==
	       XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
	error = 0;
5693 5694 5695 5696 5697 5698 5699 5700
	if (delta && delta->xed_startoff != NULLFILEOFF) {
		/* A change was actually made.
		 * Note that delta->xed_blockount is an offset at this
		 * point and needs to be converted to a block count.
		 */
		ASSERT(delta->xed_blockcount > delta->xed_startoff);
		delta->xed_blockcount -= delta->xed_startoff;
	}
L
Linus Torvalds 已提交
5701 5702 5703
error0:
	/*
	 * Log everything.  Do this after conversion, there's no point in
5704
	 * logging the extent records if we've converted to btree format.
L
Linus Torvalds 已提交
5705 5706 5707 5708 5709 5710 5711 5712 5713 5714 5715 5716 5717 5718 5719 5720 5721 5722 5723 5724 5725 5726 5727 5728
	 */
	if ((logflags & XFS_ILOG_FEXT(whichfork)) &&
	    XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
		logflags &= ~XFS_ILOG_FEXT(whichfork);
	else if ((logflags & XFS_ILOG_FBROOT(whichfork)) &&
		 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)
		logflags &= ~XFS_ILOG_FBROOT(whichfork);
	/*
	 * Log inode even in the error case, if the transaction
	 * is dirty we'll need to shut down the filesystem.
	 */
	if (logflags)
		xfs_trans_log_inode(tp, ip, logflags);
	if (cur) {
		if (!error) {
			*firstblock = cur->bc_private.b.firstblock;
			cur->bc_private.b.allocated = 0;
		}
		xfs_btree_del_cursor(cur,
			error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
	}
	return error;
}

5729 5730 5731 5732 5733 5734 5735 5736 5737 5738 5739 5740 5741 5742 5743 5744 5745 5746 5747 5748 5749 5750 5751 5752 5753 5754 5755 5756 5757 5758 5759 5760 5761
/*
 * returns 1 for success, 0 if we failed to map the extent.
 */
STATIC int
xfs_getbmapx_fix_eof_hole(
	xfs_inode_t		*ip,		/* xfs incore inode pointer */
	struct getbmap		*out,		/* output structure */
	int			prealloced,	/* this is a file with
						* preallocated data space */
	__int64_t		end,		/* last block requested */
	xfs_fsblock_t		startblock)
{
	__int64_t		fixlen;
	xfs_mount_t		*mp;		/* file system mount point */

	if (startblock == HOLESTARTBLOCK) {
		mp = ip->i_mount;
		out->bmv_block = -1;
		fixlen = XFS_FSB_TO_BB(mp, XFS_B_TO_FSB(mp, ip->i_size));
		fixlen -= out->bmv_offset;
		if (prealloced && out->bmv_offset + out->bmv_length == end) {
			/* Came to hole at EOF. Trim it. */
			if (fixlen <= 0)
				return 0;
			out->bmv_length = fixlen;
		}
	} else {
		out->bmv_block = XFS_FSB_TO_DB(ip, startblock);
	}

	return 1;
}

L
Linus Torvalds 已提交
5762 5763 5764 5765 5766
/*
 * Fcntl interface to xfs_bmapi.
 */
int						/* error code */
xfs_getbmap(
5767
	xfs_inode_t		*ip,
L
Linus Torvalds 已提交
5768 5769 5770 5771 5772 5773 5774 5775
	struct getbmap		*bmv,		/* user bmap structure */
	void			__user *ap,	/* pointer to user's array */
	int			interface)	/* interface flags */
{
	__int64_t		bmvend;		/* last block requested */
	int			error;		/* return value */
	__int64_t		fixlen;		/* length for -1 case */
	int			i;		/* extent number */
5776
	bhv_vnode_t		*vp;		/* corresponding vnode */
L
Linus Torvalds 已提交
5777 5778 5779 5780 5781 5782 5783 5784 5785 5786 5787 5788 5789 5790 5791 5792
	int			lock;		/* lock state */
	xfs_bmbt_irec_t		*map;		/* buffer for user's data */
	xfs_mount_t		*mp;		/* file system mount point */
	int			nex;		/* # of user extents can do */
	int			nexleft;	/* # of user extents left */
	int			subnex;		/* # of bmapi's can do */
	int			nmap;		/* number of map entries */
	struct getbmap		out;		/* output structure */
	int			whichfork;	/* data or attr fork */
	int			prealloced;	/* this is a file with
						 * preallocated data space */
	int			sh_unwritten;	/* true, if unwritten */
						/* extents listed separately */
	int			bmapi_flags;	/* flags for xfs_bmapi */
	__int32_t		oflags;		/* getbmapx bmv_oflags field */

5793
	vp = XFS_ITOV(ip);
L
Linus Torvalds 已提交
5794 5795 5796 5797 5798 5799 5800 5801 5802 5803 5804 5805 5806 5807 5808 5809 5810 5811
	mp = ip->i_mount;

	whichfork = interface & BMV_IF_ATTRFORK ? XFS_ATTR_FORK : XFS_DATA_FORK;
	sh_unwritten = (interface & BMV_IF_PREALLOC) != 0;

	/*	If the BMV_IF_NO_DMAPI_READ interface bit specified, do not
	 *	generate a DMAPI read event.  Otherwise, if the DM_EVENT_READ
	 *	bit is set for the file, generate a read event in order
	 *	that the DMAPI application may do its thing before we return
	 *	the extents.  Usually this means restoring user file data to
	 *	regions of the file that look like holes.
	 *
	 *	The "old behavior" (from XFS_IOC_GETBMAP) is to not specify
	 *	BMV_IF_NO_DMAPI_READ so that read events are generated.
	 *	If this were not true, callers of ioctl( XFS_IOC_GETBMAP )
	 *	could misinterpret holes in a DMAPI file as true holes,
	 *	when in fact they may represent offline user data.
	 */
5812 5813 5814
	if ((interface & BMV_IF_NO_DMAPI_READ) == 0 &&
	    DM_EVENT_ENABLED(ip, DM_EVENT_READ) &&
	    whichfork == XFS_DATA_FORK) {
L
Linus Torvalds 已提交
5815 5816 5817 5818 5819 5820 5821 5822 5823 5824 5825 5826 5827 5828 5829 5830 5831 5832 5833 5834 5835 5836 5837
		error = XFS_SEND_DATA(mp, DM_EVENT_READ, vp, 0, 0, 0, NULL);
		if (error)
			return XFS_ERROR(error);
	}

	if (whichfork == XFS_ATTR_FORK) {
		if (XFS_IFORK_Q(ip)) {
			if (ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS &&
			    ip->i_d.di_aformat != XFS_DINODE_FMT_BTREE &&
			    ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)
				return XFS_ERROR(EINVAL);
		} else if (unlikely(
			   ip->i_d.di_aformat != 0 &&
			   ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS)) {
			XFS_ERROR_REPORT("xfs_getbmap", XFS_ERRLEVEL_LOW,
					 ip->i_mount);
			return XFS_ERROR(EFSCORRUPTED);
		}
	} else if (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS &&
		   ip->i_d.di_format != XFS_DINODE_FMT_BTREE &&
		   ip->i_d.di_format != XFS_DINODE_FMT_LOCAL)
		return XFS_ERROR(EINVAL);
	if (whichfork == XFS_DATA_FORK) {
5838
		if (xfs_get_extsz_hint(ip) ||
5839
		    ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC|XFS_DIFLAG_APPEND)){
L
Linus Torvalds 已提交
5840 5841 5842 5843
			prealloced = 1;
			fixlen = XFS_MAXIOFFSET(mp);
		} else {
			prealloced = 0;
5844
			fixlen = ip->i_size;
L
Linus Torvalds 已提交
5845 5846 5847 5848 5849 5850 5851 5852 5853 5854 5855 5856 5857 5858 5859 5860 5861 5862 5863 5864 5865 5866 5867
		}
	} else {
		prealloced = 0;
		fixlen = 1LL << 32;
	}

	if (bmv->bmv_length == -1) {
		fixlen = XFS_FSB_TO_BB(mp, XFS_B_TO_FSB(mp, fixlen));
		bmv->bmv_length = MAX( (__int64_t)(fixlen - bmv->bmv_offset),
					(__int64_t)0);
	} else if (bmv->bmv_length < 0)
		return XFS_ERROR(EINVAL);
	if (bmv->bmv_length == 0) {
		bmv->bmv_entries = 0;
		return 0;
	}
	nex = bmv->bmv_count - 1;
	if (nex <= 0)
		return XFS_ERROR(EINVAL);
	bmvend = bmv->bmv_offset + bmv->bmv_length;

	xfs_ilock(ip, XFS_IOLOCK_SHARED);

5868 5869
	if (whichfork == XFS_DATA_FORK &&
		(ip->i_delayed_blks || ip->i_size > ip->i_d.di_size)) {
L
Linus Torvalds 已提交
5870
		/* xfs_fsize_t last_byte = xfs_file_last_byte(ip); */
5871
		error = bhv_vop_flush_pages(vp, (xfs_off_t)0, -1, 0, FI_REMAPF);
L
Linus Torvalds 已提交
5872 5873 5874 5875 5876 5877 5878 5879 5880 5881 5882 5883 5884 5885 5886 5887 5888 5889 5890 5891 5892 5893 5894 5895 5896 5897 5898 5899 5900 5901 5902 5903 5904 5905 5906
	}

	ASSERT(whichfork == XFS_ATTR_FORK || ip->i_delayed_blks == 0);

	lock = xfs_ilock_map_shared(ip);

	/*
	 * Don't let nex be bigger than the number of extents
	 * we can have assuming alternating holes and real extents.
	 */
	if (nex > XFS_IFORK_NEXTENTS(ip, whichfork) * 2 + 1)
		nex = XFS_IFORK_NEXTENTS(ip, whichfork) * 2 + 1;

	bmapi_flags = XFS_BMAPI_AFLAG(whichfork) |
			((sh_unwritten) ? 0 : XFS_BMAPI_IGSTATE);

	/*
	 * Allocate enough space to handle "subnex" maps at a time.
	 */
	subnex = 16;
	map = kmem_alloc(subnex * sizeof(*map), KM_SLEEP);

	bmv->bmv_entries = 0;

	if (XFS_IFORK_NEXTENTS(ip, whichfork) == 0) {
		error = 0;
		goto unlock_and_return;
	}

	nexleft = nex;

	do {
		nmap = (nexleft > subnex) ? subnex : nexleft;
		error = xfs_bmapi(NULL, ip, XFS_BB_TO_FSBT(mp, bmv->bmv_offset),
				  XFS_BB_TO_FSB(mp, bmv->bmv_length),
5907 5908
				  bmapi_flags, NULL, 0, map, &nmap,
				  NULL, NULL);
L
Linus Torvalds 已提交
5909 5910 5911 5912 5913 5914 5915 5916 5917 5918 5919
		if (error)
			goto unlock_and_return;
		ASSERT(nmap <= subnex);

		for (i = 0; i < nmap && nexleft && bmv->bmv_length; i++) {
			nexleft--;
			oflags = (map[i].br_state == XFS_EXT_UNWRITTEN) ?
					BMV_OF_PREALLOC : 0;
			out.bmv_offset = XFS_FSB_TO_BB(mp, map[i].br_startoff);
			out.bmv_length = XFS_FSB_TO_BB(mp, map[i].br_blockcount);
			ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
5920
                        if (map[i].br_startblock == HOLESTARTBLOCK &&
5921 5922
			    whichfork == XFS_ATTR_FORK) {
				/* came to the end of attribute fork */
L
Linus Torvalds 已提交
5923 5924
				goto unlock_and_return;
			} else {
5925 5926 5927 5928 5929
				if (!xfs_getbmapx_fix_eof_hole(ip, &out,
							prealloced, bmvend,
							map[i].br_startblock)) {
					goto unlock_and_return;
				}
L
Linus Torvalds 已提交
5930 5931 5932 5933 5934 5935 5936 5937 5938 5939 5940 5941 5942 5943 5944 5945 5946 5947 5948 5949 5950 5951 5952 5953 5954 5955 5956 5957 5958 5959 5960 5961 5962 5963 5964 5965 5966 5967 5968 5969 5970 5971 5972 5973 5974 5975 5976 5977 5978

				/* return either getbmap/getbmapx structure. */
				if (interface & BMV_IF_EXTENDED) {
					struct	getbmapx	outx;

					GETBMAP_CONVERT(out,outx);
					outx.bmv_oflags = oflags;
					outx.bmv_unused1 = outx.bmv_unused2 = 0;
					if (copy_to_user(ap, &outx,
							sizeof(outx))) {
						error = XFS_ERROR(EFAULT);
						goto unlock_and_return;
					}
				} else {
					if (copy_to_user(ap, &out,
							sizeof(out))) {
						error = XFS_ERROR(EFAULT);
						goto unlock_and_return;
					}
				}
				bmv->bmv_offset =
					out.bmv_offset + out.bmv_length;
				bmv->bmv_length = MAX((__int64_t)0,
					(__int64_t)(bmvend - bmv->bmv_offset));
				bmv->bmv_entries++;
				ap = (interface & BMV_IF_EXTENDED) ?
						(void __user *)
					((struct getbmapx __user *)ap + 1) :
						(void __user *)
					((struct getbmap __user *)ap + 1);
			}
		}
	} while (nmap && nexleft && bmv->bmv_length);

unlock_and_return:
	xfs_iunlock_map_shared(ip, lock);
	xfs_iunlock(ip, XFS_IOLOCK_SHARED);

	kmem_free(map, subnex * sizeof(*map));

	return error;
}

/*
 * Check the last inode extent to determine whether this allocation will result
 * in blocks being allocated at the end of the file. When we allocate new data
 * blocks at the end of the file which do not start at the previous data block,
 * we will try to align the new blocks at stripe unit boundaries.
 */
5979
STATIC int				/* error */
L
Linus Torvalds 已提交
5980 5981 5982 5983 5984 5985 5986 5987
xfs_bmap_isaeof(
	xfs_inode_t	*ip,		/* incore inode pointer */
	xfs_fileoff_t   off,		/* file offset in fsblocks */
	int             whichfork,	/* data or attribute fork */
	char		*aeof)		/* return value */
{
	int		error;		/* error return value */
	xfs_ifork_t	*ifp;		/* inode fork pointer */
5988
	xfs_bmbt_rec_host_t *lastrec;	/* extent record pointer */
5989 5990
	xfs_extnum_t	nextents;	/* number of file extents */
	xfs_bmbt_irec_t	s;		/* expanded extent record */
L
Linus Torvalds 已提交
5991 5992 5993 5994 5995 5996 5997 5998 5999 6000 6001 6002 6003 6004

	ASSERT(whichfork == XFS_DATA_FORK);
	ifp = XFS_IFORK_PTR(ip, whichfork);
	if (!(ifp->if_flags & XFS_IFEXTENTS) &&
	    (error = xfs_iread_extents(NULL, ip, whichfork)))
		return error;
	nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
	if (nextents == 0) {
		*aeof = 1;
		return 0;
	}
	/*
	 * Go to the last extent
	 */
6005
	lastrec = xfs_iext_get_ext(ifp, nextents - 1);
L
Linus Torvalds 已提交
6006 6007 6008 6009 6010 6011 6012 6013 6014 6015 6016 6017 6018 6019 6020 6021 6022 6023 6024 6025 6026 6027 6028 6029 6030 6031
	xfs_bmbt_get_all(lastrec, &s);
	/*
	 * Check we are allocating in the last extent (for delayed allocations)
	 * or past the last extent for non-delayed allocations.
	 */
	*aeof = (off >= s.br_startoff &&
		 off < s.br_startoff + s.br_blockcount &&
		 ISNULLSTARTBLOCK(s.br_startblock)) ||
		off >= s.br_startoff + s.br_blockcount;
	return 0;
}

/*
 * Check if the endoff is outside the last extent. If so the caller will grow
 * the allocation to a stripe unit boundary.
 */
int					/* error */
xfs_bmap_eof(
	xfs_inode_t	*ip,		/* incore inode pointer */
	xfs_fileoff_t	endoff,		/* file offset in fsblocks */
	int		whichfork,	/* data or attribute fork */
	int		*eof)		/* result value */
{
	xfs_fsblock_t	blockcount;	/* extent block count */
	int		error;		/* error return value */
	xfs_ifork_t	*ifp;		/* inode fork pointer */
6032
	xfs_bmbt_rec_host_t *lastrec;	/* extent record pointer */
6033
	xfs_extnum_t	nextents;	/* number of file extents */
L
Linus Torvalds 已提交
6034 6035 6036 6037 6038 6039 6040 6041 6042 6043 6044 6045 6046 6047 6048
	xfs_fileoff_t	startoff;	/* extent starting file offset */

	ASSERT(whichfork == XFS_DATA_FORK);
	ifp = XFS_IFORK_PTR(ip, whichfork);
	if (!(ifp->if_flags & XFS_IFEXTENTS) &&
	    (error = xfs_iread_extents(NULL, ip, whichfork)))
		return error;
	nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
	if (nextents == 0) {
		*eof = 1;
		return 0;
	}
	/*
	 * Go to the last extent
	 */
6049
	lastrec = xfs_iext_get_ext(ifp, nextents - 1);
L
Linus Torvalds 已提交
6050 6051 6052 6053 6054 6055 6056 6057 6058 6059 6060 6061 6062 6063 6064 6065 6066 6067 6068 6069 6070 6071 6072 6073 6074 6075 6076 6077 6078 6079 6080 6081 6082 6083 6084 6085 6086 6087 6088 6089 6090 6091 6092 6093 6094 6095 6096 6097 6098 6099 6100 6101 6102 6103 6104 6105 6106 6107 6108 6109 6110 6111 6112 6113 6114 6115 6116 6117 6118 6119 6120 6121 6122 6123 6124 6125 6126
	startoff = xfs_bmbt_get_startoff(lastrec);
	blockcount = xfs_bmbt_get_blockcount(lastrec);
	*eof = endoff >= startoff + blockcount;
	return 0;
}

#ifdef DEBUG
STATIC
xfs_buf_t *
xfs_bmap_get_bp(
	xfs_btree_cur_t         *cur,
	xfs_fsblock_t		bno)
{
	int i;
	xfs_buf_t *bp;

	if (!cur)
		return(NULL);

	bp = NULL;
	for(i = 0; i < XFS_BTREE_MAXLEVELS; i++) {
		bp = cur->bc_bufs[i];
		if (!bp) break;
		if (XFS_BUF_ADDR(bp) == bno)
			break;	/* Found it */
	}
	if (i == XFS_BTREE_MAXLEVELS)
		bp = NULL;

	if (!bp) { /* Chase down all the log items to see if the bp is there */
		xfs_log_item_chunk_t    *licp;
		xfs_trans_t		*tp;

		tp = cur->bc_tp;
		licp = &tp->t_items;
		while (!bp && licp != NULL) {
			if (XFS_LIC_ARE_ALL_FREE(licp)) {
				licp = licp->lic_next;
				continue;
			}
			for (i = 0; i < licp->lic_unused; i++) {
				xfs_log_item_desc_t	*lidp;
				xfs_log_item_t		*lip;
				xfs_buf_log_item_t	*bip;
				xfs_buf_t		*lbp;

				if (XFS_LIC_ISFREE(licp, i)) {
					continue;
				}

				lidp = XFS_LIC_SLOT(licp, i);
				lip = lidp->lid_item;
				if (lip->li_type != XFS_LI_BUF)
					continue;

				bip = (xfs_buf_log_item_t *)lip;
				lbp = bip->bli_buf;

				if (XFS_BUF_ADDR(lbp) == bno) {
					bp = lbp;
					break; /* Found it */
				}
			}
			licp = licp->lic_next;
		}
	}
	return(bp);
}

void
xfs_check_block(
	xfs_bmbt_block_t        *block,
	xfs_mount_t		*mp,
	int			root,
	short			sz)
{
	int			i, j, dmxr;
6127
	__be64			*pp, *thispa;	/* pointer to block address */
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	xfs_bmbt_key_t		*prevp, *keyp;

6130
	ASSERT(be16_to_cpu(block->bb_level) > 0);
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6131 6132

	prevp = NULL;
6133
	for( i = 1; i <= be16_to_cpu(block->bb_numrecs); i++) {
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		dmxr = mp->m_bmap_dmxr[0];

		if (root) {
			keyp = XFS_BMAP_BROOT_KEY_ADDR(block, i, sz);
		} else {
6139
			keyp = XFS_BTREE_KEY_ADDR(xfs_bmbt, block, i);
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		}

		if (prevp) {
			xfs_btree_check_key(XFS_BTNUM_BMAP, prevp, keyp);
		}
		prevp = keyp;

		/*
		 * Compare the block numbers to see if there are dups.
		 */

		if (root) {
			pp = XFS_BMAP_BROOT_PTR_ADDR(block, i, sz);
		} else {
6154
			pp = XFS_BTREE_PTR_ADDR(xfs_bmbt, block, i, dmxr);
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6155
		}
6156
		for (j = i+1; j <= be16_to_cpu(block->bb_numrecs); j++) {
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			if (root) {
				thispa = XFS_BMAP_BROOT_PTR_ADDR(block, j, sz);
			} else {
6160 6161
				thispa = XFS_BTREE_PTR_ADDR(xfs_bmbt, block, j,
							    dmxr);
L
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6162
			}
6163
			if (*thispa == *pp) {
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				cmn_err(CE_WARN, "%s: thispa(%d) == pp(%d) %Ld",
					__FUNCTION__, j, i,
6166
					(unsigned long long)be64_to_cpu(*thispa));
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				panic("%s: ptrs are equal in node\n",
					__FUNCTION__);
			}
		}
	}
}

/*
 * Check that the extents for the inode ip are in the right order in all
 * btree leaves.
 */

STATIC void
xfs_bmap_check_leaf_extents(
	xfs_btree_cur_t		*cur,	/* btree cursor or null */
	xfs_inode_t		*ip,		/* incore inode pointer */
	int			whichfork)	/* data or attr fork */
{
	xfs_bmbt_block_t	*block;	/* current btree block */
	xfs_fsblock_t		bno;	/* block # of "block" */
	xfs_buf_t		*bp;	/* buffer for "block" */
	int			error;	/* error return value */
6189
	xfs_extnum_t		i=0, j;	/* index into the extents list */
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	xfs_ifork_t		*ifp;	/* fork structure */
	int			level;	/* btree level, for checking */
	xfs_mount_t		*mp;	/* file system mount structure */
6193
	__be64			*pp;	/* pointer to block address */
6194 6195 6196
	xfs_bmbt_rec_t		*ep;	/* pointer to current extent */
	xfs_bmbt_rec_t		*lastp; /* pointer to previous extent */
	xfs_bmbt_rec_t		*nextp;	/* pointer to next extent */
L
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	int			bp_release = 0;

	if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE) {
		return;
	}

	bno = NULLFSBLOCK;
	mp = ip->i_mount;
	ifp = XFS_IFORK_PTR(ip, whichfork);
	block = ifp->if_broot;
	/*
	 * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
	 */
6210 6211
	level = be16_to_cpu(block->bb_level);
	ASSERT(level > 0);
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	xfs_check_block(block, mp, 1, ifp->if_broot_bytes);
	pp = XFS_BMAP_BROOT_PTR_ADDR(block, 1, ifp->if_broot_bytes);
6214 6215 6216 6217 6218 6219
	bno = be64_to_cpu(*pp);

	ASSERT(bno != NULLDFSBNO);
	ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount);
	ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks);

L
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	/*
	 * Go down the tree until leaf level is reached, following the first
	 * pointer (leftmost) at each level.
	 */
	while (level-- > 0) {
		/* See if buf is in cur first */
		bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
		if (bp) {
			bp_release = 0;
		} else {
			bp_release = 1;
		}
		if (!bp && (error = xfs_btree_read_bufl(mp, NULL, bno, 0, &bp,
				XFS_BMAP_BTREE_REF)))
			goto error_norelse;
		block = XFS_BUF_TO_BMBT_BLOCK(bp);
		XFS_WANT_CORRUPTED_GOTO(
			XFS_BMAP_SANITY_CHECK(mp, block, level),
			error0);
		if (level == 0)
			break;

		/*
		 * Check this block for basic sanity (increasing keys and
		 * no duplicate blocks).
		 */

		xfs_check_block(block, mp, 0, 0);
6248
		pp = XFS_BTREE_PTR_ADDR(xfs_bmbt, block, 1, mp->m_bmap_dmxr[1]);
6249 6250
		bno = be64_to_cpu(*pp);
		XFS_WANT_CORRUPTED_GOTO(XFS_FSB_SANITY_CHECK(mp, bno), error0);
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		if (bp_release) {
			bp_release = 0;
			xfs_trans_brelse(NULL, bp);
		}
	}

	/*
	 * Here with bp and block set to the leftmost leaf node in the tree.
	 */
	i = 0;

	/*
	 * Loop over all leaf nodes checking that all extents are in the right order.
	 */
	lastp = NULL;
	for (;;) {
		xfs_fsblock_t	nextbno;
		xfs_extnum_t	num_recs;


6271
		num_recs = be16_to_cpu(block->bb_numrecs);
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		/*
		 * Read-ahead the next leaf block, if any.
		 */

6277
		nextbno = be64_to_cpu(block->bb_rightsib);
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		/*
		 * Check all the extents to make sure they are OK.
		 * If we had a previous block, the last entry should
		 * conform with the first entry in this one.
		 */

6285
		ep = XFS_BTREE_REC_ADDR(xfs_bmbt, block, 1);
6286
		for (j = 1; j < num_recs; j++) {
6287
			nextp = XFS_BTREE_REC_ADDR(xfs_bmbt, block, j + 1);
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			if (lastp) {
				xfs_btree_check_rec(XFS_BTNUM_BMAP,
					(void *)lastp, (void *)ep);
			}
			xfs_btree_check_rec(XFS_BTNUM_BMAP, (void *)ep,
6293 6294 6295
				(void *)(nextp));
			lastp = ep;
			ep = nextp;
L
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		}

		i += num_recs;
		if (bp_release) {
			bp_release = 0;
			xfs_trans_brelse(NULL, bp);
		}
		bno = nextbno;
		/*
		 * If we've reached the end, stop.
		 */
		if (bno == NULLFSBLOCK)
			break;

		bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
		if (bp) {
			bp_release = 0;
		} else {
			bp_release = 1;
		}
		if (!bp && (error = xfs_btree_read_bufl(mp, NULL, bno, 0, &bp,
				XFS_BMAP_BTREE_REF)))
			goto error_norelse;
		block = XFS_BUF_TO_BMBT_BLOCK(bp);
	}
	if (bp_release) {
		bp_release = 0;
		xfs_trans_brelse(NULL, bp);
	}
	return;

error0:
	cmn_err(CE_WARN, "%s: at error0", __FUNCTION__);
	if (bp_release)
		xfs_trans_brelse(NULL, bp);
error_norelse:
	cmn_err(CE_WARN, "%s: BAD after btree leaves for %d extents",
6333
		__FUNCTION__, i);
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	panic("%s: CORRUPTED BTREE OR SOMETHING", __FUNCTION__);
	return;
}
#endif

/*
 * Count fsblocks of the given fork.
 */
int						/* error */
xfs_bmap_count_blocks(
	xfs_trans_t		*tp,		/* transaction pointer */
	xfs_inode_t		*ip,		/* incore inode */
	int			whichfork,	/* data or attr fork */
	int			*count)		/* out: count of blocks */
{
	xfs_bmbt_block_t	*block;	/* current btree block */
	xfs_fsblock_t		bno;	/* block # of "block" */
	xfs_ifork_t		*ifp;	/* fork structure */
	int			level;	/* btree level, for checking */
	xfs_mount_t		*mp;	/* file system mount structure */
6354
	__be64			*pp;	/* pointer to block address */
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	bno = NULLFSBLOCK;
	mp = ip->i_mount;
	ifp = XFS_IFORK_PTR(ip, whichfork);
	if ( XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS ) {
6360
		if (unlikely(xfs_bmap_count_leaves(ifp, 0,
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			ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t),
			count) < 0)) {
			XFS_ERROR_REPORT("xfs_bmap_count_blocks(1)",
					 XFS_ERRLEVEL_LOW, mp);
			return XFS_ERROR(EFSCORRUPTED);
		}
		return 0;
	}

	/*
	 * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
	 */
	block = ifp->if_broot;
6374 6375
	level = be16_to_cpu(block->bb_level);
	ASSERT(level > 0);
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	pp = XFS_BMAP_BROOT_PTR_ADDR(block, 1, ifp->if_broot_bytes);
6377 6378 6379 6380
	bno = be64_to_cpu(*pp);
	ASSERT(bno != NULLDFSBNO);
	ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount);
	ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks);
L
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6381

6382
	if (unlikely(xfs_bmap_count_tree(mp, tp, ifp, bno, level, count) < 0)) {
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		XFS_ERROR_REPORT("xfs_bmap_count_blocks(2)", XFS_ERRLEVEL_LOW,
				 mp);
		return XFS_ERROR(EFSCORRUPTED);
	}

	return 0;
}

/*
 * Recursively walks each level of a btree
 * to count total fsblocks is use.
 */
int                                     /* error */
xfs_bmap_count_tree(
	xfs_mount_t     *mp,            /* file system mount point */
	xfs_trans_t     *tp,            /* transaction pointer */
6399
	xfs_ifork_t	*ifp,		/* inode fork pointer */
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	xfs_fsblock_t   blockno,	/* file system block number */
	int             levelin,	/* level in btree */
	int		*count)		/* Count of blocks */
{
	int			error;
	xfs_buf_t		*bp, *nbp;
	int			level = levelin;
6407
	__be64			*pp;
L
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	xfs_fsblock_t           bno = blockno;
	xfs_fsblock_t		nextbno;
	xfs_bmbt_block_t        *block, *nextblock;
	int			numrecs;

	if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp, XFS_BMAP_BTREE_REF)))
		return error;
	*count += 1;
	block = XFS_BUF_TO_BMBT_BLOCK(bp);

	if (--level) {
		/* Not at node above leafs, count this level of nodes */
6420
		nextbno = be64_to_cpu(block->bb_rightsib);
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6421 6422 6423 6424 6425 6426
		while (nextbno != NULLFSBLOCK) {
			if ((error = xfs_btree_read_bufl(mp, tp, nextbno,
				0, &nbp, XFS_BMAP_BTREE_REF)))
				return error;
			*count += 1;
			nextblock = XFS_BUF_TO_BMBT_BLOCK(nbp);
6427
			nextbno = be64_to_cpu(nextblock->bb_rightsib);
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6428 6429 6430 6431
			xfs_trans_brelse(tp, nbp);
		}

		/* Dive to the next level */
6432
		pp = XFS_BTREE_PTR_ADDR(xfs_bmbt, block, 1, mp->m_bmap_dmxr[1]);
6433
		bno = be64_to_cpu(*pp);
L
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6434
		if (unlikely((error =
6435
		     xfs_bmap_count_tree(mp, tp, ifp, bno, level, count)) < 0)) {
L
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6436 6437 6438 6439 6440 6441 6442 6443 6444
			xfs_trans_brelse(tp, bp);
			XFS_ERROR_REPORT("xfs_bmap_count_tree(1)",
					 XFS_ERRLEVEL_LOW, mp);
			return XFS_ERROR(EFSCORRUPTED);
		}
		xfs_trans_brelse(tp, bp);
	} else {
		/* count all level 1 nodes and their leaves */
		for (;;) {
6445 6446
			nextbno = be64_to_cpu(block->bb_rightsib);
			numrecs = be16_to_cpu(block->bb_numrecs);
6447 6448
			if (unlikely(xfs_bmap_disk_count_leaves(0,
					block, numrecs, count) < 0)) {
L
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6449 6450 6451 6452 6453 6454 6455 6456 6457 6458 6459 6460 6461 6462 6463 6464 6465 6466 6467 6468
				xfs_trans_brelse(tp, bp);
				XFS_ERROR_REPORT("xfs_bmap_count_tree(2)",
						 XFS_ERRLEVEL_LOW, mp);
				return XFS_ERROR(EFSCORRUPTED);
			}
			xfs_trans_brelse(tp, bp);
			if (nextbno == NULLFSBLOCK)
				break;
			bno = nextbno;
			if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
				XFS_BMAP_BTREE_REF)))
				return error;
			*count += 1;
			block = XFS_BUF_TO_BMBT_BLOCK(bp);
		}
	}
	return 0;
}

/*
6469
 * Count leaf blocks given a range of extent records.
L
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 */
int
xfs_bmap_count_leaves(
6473 6474
	xfs_ifork_t		*ifp,
	xfs_extnum_t		idx,
L
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6475 6476 6477 6478 6479
	int			numrecs,
	int			*count)
{
	int		b;

6480
	for (b = 0; b < numrecs; b++) {
6481
		xfs_bmbt_rec_host_t *frp = xfs_iext_get_ext(ifp, idx + b);
6482
		*count += xfs_bmbt_get_blockcount(frp);
6483
	}
6484 6485 6486 6487
	return 0;
}

/*
6488 6489
 * Count leaf blocks given a range of extent records originally
 * in btree format.
6490 6491 6492
 */
int
xfs_bmap_disk_count_leaves(
6493 6494
	xfs_extnum_t		idx,
	xfs_bmbt_block_t	*block,
6495 6496 6497 6498
	int			numrecs,
	int			*count)
{
	int		b;
6499
	xfs_bmbt_rec_t	*frp;
6500

6501
	for (b = 1; b <= numrecs; b++) {
6502
		frp = XFS_BTREE_REC_ADDR(xfs_bmbt, block, idx + b);
L
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6503
		*count += xfs_bmbt_disk_get_blockcount(frp);
6504
	}
L
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	return 0;
}