xfs_bmap.c 171.1 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_shared.h"
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#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
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#include "xfs_bit.h"
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#include "xfs_sb.h"
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#include "xfs_mount.h"
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#include "xfs_da_format.h"
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#include "xfs_da_btree.h"
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#include "xfs_dir2.h"
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#include "xfs_inode.h"
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#include "xfs_btree.h"
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#include "xfs_trans.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"
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#include "xfs_bmap_util.h"
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#include "xfs_bmap_btree.h"
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#include "xfs_rtalloc.h"
#include "xfs_error.h"
#include "xfs_quota.h"
#include "xfs_trans_space.h"
#include "xfs_buf_item.h"
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#include "xfs_trace.h"
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#include "xfs_symlink.h"
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#include "xfs_attr_leaf.h"
#include "xfs_filestream.h"
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kmem_zone_t		*xfs_bmap_free_item_zone;

/*
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 * Miscellaneous helper functions
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 */

/*
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 * Compute and fill in the value of the maximum depth of a bmap btree
 * in this filesystem.  Done once, during mount.
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 */
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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 */
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	/*
	 * 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).
	 *
	 * Note that we can no longer assume that if we are in ATTR1 that
	 * the fork offset of all the inodes will be
	 * (xfs_default_attroffset(ip) >> 3) because we could have mounted
	 * with ATTR2 and then mounted back with ATTR1, keeping the
	 * di_forkoff's fixed but probably at various positions. Therefore,
	 * for both ATTR1 and ATTR2 we have to assume the worst case scenario
	 * of a minimum size available.
	 */
	if (whichfork == XFS_DATA_FORK) {
		maxleafents = MAXEXTNUM;
		sz = XFS_BMDR_SPACE_CALC(MINDBTPTRS);
	} else {
		maxleafents = MAXAEXTNUM;
		sz = XFS_BMDR_SPACE_CALC(MINABTPTRS);
	}
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	maxrootrecs = xfs_bmdr_maxrecs(sz, 0);
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	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;
}
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STATIC int				/* error */
xfs_bmbt_lookup_eq(
	struct xfs_btree_cur	*cur,
	xfs_fileoff_t		off,
	xfs_fsblock_t		bno,
	xfs_filblks_t		len,
	int			*stat)	/* success/failure */
{
	cur->bc_rec.b.br_startoff = off;
	cur->bc_rec.b.br_startblock = bno;
	cur->bc_rec.b.br_blockcount = len;
	return xfs_btree_lookup(cur, XFS_LOOKUP_EQ, stat);
}

STATIC int				/* error */
xfs_bmbt_lookup_ge(
	struct xfs_btree_cur	*cur,
	xfs_fileoff_t		off,
	xfs_fsblock_t		bno,
	xfs_filblks_t		len,
	int			*stat)	/* success/failure */
{
	cur->bc_rec.b.br_startoff = off;
	cur->bc_rec.b.br_startblock = bno;
	cur->bc_rec.b.br_blockcount = len;
	return xfs_btree_lookup(cur, XFS_LOOKUP_GE, stat);
}

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/*
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 * Check if the inode needs to be converted to btree format.
 */
static inline bool xfs_bmap_needs_btree(struct xfs_inode *ip, int whichfork)
{
	return XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
		XFS_IFORK_NEXTENTS(ip, whichfork) >
			XFS_IFORK_MAXEXT(ip, whichfork);
}

/*
 * Check if the inode should be converted to extent format.
 */
static inline bool xfs_bmap_wants_extents(struct xfs_inode *ip, int whichfork)
{
	return XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE &&
		XFS_IFORK_NEXTENTS(ip, whichfork) <=
			XFS_IFORK_MAXEXT(ip, whichfork);
}

/*
 * Update the record referred to by cur to the value given
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 * by [off, bno, len, state].
 * This either works (return 0) or gets an EFSCORRUPTED error.
 */
STATIC int
xfs_bmbt_update(
	struct xfs_btree_cur	*cur,
	xfs_fileoff_t		off,
	xfs_fsblock_t		bno,
	xfs_filblks_t		len,
	xfs_exntst_t		state)
{
	union xfs_btree_rec	rec;

	xfs_bmbt_disk_set_allf(&rec.bmbt, off, bno, len, state);
	return xfs_btree_update(cur, &rec);
}
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/*
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 * Compute the worst-case number of indirect blocks that will be used
 * for ip's delayed extent of length "len".
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 */
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STATIC xfs_filblks_t
xfs_bmap_worst_indlen(
	xfs_inode_t	*ip,		/* incore inode pointer */
	xfs_filblks_t	len)		/* delayed extent length */
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{
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	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 */
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	mp = ip->i_mount;
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	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];
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	}
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	return rval;
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}

/*
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 * Calculate the default attribute fork offset for newly created inodes.
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 */
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uint
xfs_default_attroffset(
	struct xfs_inode	*ip)
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{
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	struct xfs_mount	*mp = ip->i_mount;
	uint			offset;
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	if (mp->m_sb.sb_inodesize == 256) {
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		offset = XFS_LITINO(mp, ip->i_d.di_version) -
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				XFS_BMDR_SPACE_CALC(MINABTPTRS);
	} else {
		offset = XFS_BMDR_SPACE_CALC(6 * MINABTPTRS);
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	}
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	ASSERT(offset < XFS_LITINO(mp, ip->i_d.di_version));
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	return offset;
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}

/*
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 * 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.
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 */
STATIC void
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xfs_bmap_forkoff_reset(
	xfs_inode_t	*ip,
	int		whichfork)
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{
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	if (whichfork == XFS_ATTR_FORK &&
	    ip->i_d.di_format != XFS_DINODE_FMT_DEV &&
	    ip->i_d.di_format != XFS_DINODE_FMT_UUID &&
	    ip->i_d.di_format != XFS_DINODE_FMT_BTREE) {
		uint	dfl_forkoff = xfs_default_attroffset(ip) >> 3;

		if (dfl_forkoff > ip->i_d.di_forkoff)
			ip->i_d.di_forkoff = dfl_forkoff;
	}
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}

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#ifdef DEBUG
STATIC struct xfs_buf *
xfs_bmap_get_bp(
	struct xfs_btree_cur	*cur,
	xfs_fsblock_t		bno)
{
	struct xfs_log_item_desc *lidp;
	int			i;
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	if (!cur)
		return NULL;

	for (i = 0; i < XFS_BTREE_MAXLEVELS; i++) {
		if (!cur->bc_bufs[i])
			break;
		if (XFS_BUF_ADDR(cur->bc_bufs[i]) == bno)
			return cur->bc_bufs[i];
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	}
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	/* Chase down all the log items to see if the bp is there */
	list_for_each_entry(lidp, &cur->bc_tp->t_items, lid_trans) {
		struct xfs_buf_log_item	*bip;
		bip = (struct xfs_buf_log_item *)lidp->lid_item;
		if (bip->bli_item.li_type == XFS_LI_BUF &&
		    XFS_BUF_ADDR(bip->bli_buf) == bno)
			return bip->bli_buf;
	}
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	return NULL;
}
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STATIC void
xfs_check_block(
	struct xfs_btree_block	*block,
	xfs_mount_t		*mp,
	int			root,
	short			sz)
{
	int			i, j, dmxr;
	__be64			*pp, *thispa;	/* pointer to block address */
	xfs_bmbt_key_t		*prevp, *keyp;
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	ASSERT(be16_to_cpu(block->bb_level) > 0);
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	prevp = NULL;
	for( i = 1; i <= xfs_btree_get_numrecs(block); i++) {
		dmxr = mp->m_bmap_dmxr[0];
		keyp = XFS_BMBT_KEY_ADDR(mp, block, i);
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		if (prevp) {
			ASSERT(be64_to_cpu(prevp->br_startoff) <
			       be64_to_cpu(keyp->br_startoff));
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		}
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		prevp = keyp;
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		/*
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		 * Compare the block numbers to see if there are dups.
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		 */
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		if (root)
			pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, i, sz);
		else
			pp = XFS_BMBT_PTR_ADDR(mp, block, i, dmxr);
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		for (j = i+1; j <= be16_to_cpu(block->bb_numrecs); j++) {
			if (root)
				thispa = XFS_BMAP_BROOT_PTR_ADDR(mp, block, j, sz);
			else
				thispa = XFS_BMBT_PTR_ADDR(mp, block, j, dmxr);
			if (*thispa == *pp) {
				xfs_warn(mp, "%s: thispa(%d) == pp(%d) %Ld",
					__func__, j, i,
					(unsigned long long)be64_to_cpu(*thispa));
				panic("%s: ptrs are equal in node\n",
					__func__);
			}
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		}
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	}
}
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/*
 * Check that the extents for the inode ip are in the right order in all
 * btree leaves.
 */
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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 */
{
	struct xfs_btree_block	*block;	/* current btree block */
	xfs_fsblock_t		bno;	/* block # of "block" */
	xfs_buf_t		*bp;	/* buffer for "block" */
	int			error;	/* error return value */
	xfs_extnum_t		i=0, 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 */
	__be64			*pp;	/* pointer to block address */
	xfs_bmbt_rec_t		*ep;	/* pointer to current extent */
	xfs_bmbt_rec_t		last = {0, 0}; /* last extent in prev block */
	xfs_bmbt_rec_t		*nextp;	/* pointer to next extent */
	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.
	 */
	level = be16_to_cpu(block->bb_level);
	ASSERT(level > 0);
	xfs_check_block(block, mp, 1, ifp->if_broot_bytes);
	pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes);
	bno = be64_to_cpu(*pp);

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

	/*
	 * 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_release = 0;
		bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
		if (!bp) {
			bp_release = 1;
			error = xfs_btree_read_bufl(mp, NULL, bno, 0, &bp,
						XFS_BMAP_BTREE_REF,
						&xfs_bmbt_buf_ops);
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			if (error)
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				goto error_norelse;
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		}
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		block = XFS_BUF_TO_BLOCK(bp);
		if (level == 0)
			break;
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		/*
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		 * Check this block for basic sanity (increasing keys and
		 * no duplicate blocks).
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		 */
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		xfs_check_block(block, mp, 0, 0);
		pp = XFS_BMBT_PTR_ADDR(mp, block, 1, mp->m_bmap_dmxr[1]);
		bno = be64_to_cpu(*pp);
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		XFS_WANT_CORRUPTED_GOTO(mp,
					XFS_FSB_SANITY_CHECK(mp, bno), error0);
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		if (bp_release) {
			bp_release = 0;
			xfs_trans_brelse(NULL, bp);
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		}
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	}
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	/*
	 * 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.
	 */
	for (;;) {
		xfs_fsblock_t	nextbno;
		xfs_extnum_t	num_recs;


		num_recs = xfs_btree_get_numrecs(block);
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		/*
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		 * Read-ahead the next leaf block, if any.
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		 */
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		nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
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		/*
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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.
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		 */
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		ep = XFS_BMBT_REC_ADDR(mp, block, 1);
		if (i) {
			ASSERT(xfs_bmbt_disk_get_startoff(&last) +
			       xfs_bmbt_disk_get_blockcount(&last) <=
			       xfs_bmbt_disk_get_startoff(ep));
		}
		for (j = 1; j < num_recs; j++) {
			nextp = XFS_BMBT_REC_ADDR(mp, block, j + 1);
			ASSERT(xfs_bmbt_disk_get_startoff(ep) +
			       xfs_bmbt_disk_get_blockcount(ep) <=
			       xfs_bmbt_disk_get_startoff(nextp));
			ep = nextp;
		}
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		last = *ep;
		i += num_recs;
		if (bp_release) {
			bp_release = 0;
			xfs_trans_brelse(NULL, bp);
		}
		bno = nextbno;
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		/*
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		 * If we've reached the end, stop.
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		 */
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		if (bno == NULLFSBLOCK)
			break;
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		bp_release = 0;
		bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
		if (!bp) {
			bp_release = 1;
			error = xfs_btree_read_bufl(mp, NULL, bno, 0, &bp,
						XFS_BMAP_BTREE_REF,
						&xfs_bmbt_buf_ops);
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			if (error)
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				goto error_norelse;
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		}
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		block = XFS_BUF_TO_BLOCK(bp);
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	}
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	if (bp_release) {
		bp_release = 0;
		xfs_trans_brelse(NULL, bp);
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	}
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	return;
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error0:
	xfs_warn(mp, "%s: at error0", __func__);
	if (bp_release)
		xfs_trans_brelse(NULL, bp);
error_norelse:
	xfs_warn(mp, "%s: BAD after btree leaves for %d extents",
		__func__, i);
	panic("%s: CORRUPTED BTREE OR SOMETHING", __func__);
	return;
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}

/*
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 * Add bmap trace insert entries for all the contents of the extent records.
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 */
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void
xfs_bmap_trace_exlist(
	xfs_inode_t	*ip,		/* incore inode pointer */
	xfs_extnum_t	cnt,		/* count of entries in the list */
	int		whichfork,	/* data or attr fork */
	unsigned long	caller_ip)
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{
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	xfs_extnum_t	idx;		/* extent record index */
	xfs_ifork_t	*ifp;		/* inode fork pointer */
	int		state = 0;
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	if (whichfork == XFS_ATTR_FORK)
		state |= BMAP_ATTRFORK;
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	ifp = XFS_IFORK_PTR(ip, whichfork);
	ASSERT(cnt == (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)));
	for (idx = 0; idx < cnt; idx++)
		trace_xfs_extlist(ip, idx, whichfork, caller_ip);
}
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/*
 * Validate that the bmbt_irecs being returned from bmapi are valid
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 * given the caller's original parameters.  Specifically check the
 * ranges of the returned irecs to ensure that they only extend beyond
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 * 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 */
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	ASSERT(ret_nmap <= nmap);
532

533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553
	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);
		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);
	}
}
554

555 556 557 558
#else
#define xfs_bmap_check_leaf_extents(cur, ip, whichfork)		do { } while (0)
#define	xfs_bmap_validate_ret(bno,len,flags,mval,onmap,nmap)
#endif /* DEBUG */
559

560 561 562
/*
 * bmap free list manipulation functions
 */
563

564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601
/*
 * Add the extent to the list of extents to be free at transaction end.
 * The list is maintained sorted (by block number).
 */
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;
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Linus Torvalds 已提交
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	}
603 604 605 606 607 608 609
	if (prev)
		prev->xbfi_next = new;
	else
		flist->xbf_first = new;
	new->xbfi_next = cur;
	flist->xbf_count++;
}
610

611 612 613 614
/*
 * Remove the entry "free" from the free item list.  Prev points to the
 * previous entry, unless "free" is the head of the list.
 */
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Dave Chinner 已提交
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void
616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637
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);
}

/*
 * 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;
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Christoph Hellwig 已提交
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639 640 641 642 643 644 645 646 647
	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);
}
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649 650 651
/*
 * Inode fork format manipulation functions
 */
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Linus Torvalds 已提交
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653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675
/*
 * Transform a btree format file with only one leaf node, where the
 * extents list will fit in the inode, into an extents format file.
 * Since the file extents are already in-core, all we have to do is
 * 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 */
	struct xfs_btree_block	*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 */
	__be64			*pp;	/* ptr to block address */
	struct xfs_btree_block	*rblock;/* root btree block */
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Linus Torvalds 已提交
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677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711
	mp = ip->i_mount;
	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;
	ASSERT(be16_to_cpu(rblock->bb_level) == 1);
	ASSERT(be16_to_cpu(rblock->bb_numrecs) == 1);
	ASSERT(xfs_bmbt_maxrecs(mp, ifp->if_broot_bytes, 0) == 1);
	pp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, ifp->if_broot_bytes);
	cbno = be64_to_cpu(*pp);
	*logflagsp = 0;
#ifdef DEBUG
	if ((error = xfs_btree_check_lptr(cur, cbno, 1)))
		return error;
#endif
	error = xfs_btree_read_bufl(mp, tp, cbno, 0, &cbp, XFS_BMAP_BTREE_REF,
				&xfs_bmbt_buf_ops);
	if (error)
		return error;
	cblock = XFS_BUF_TO_BLOCK(cbp);
	if ((error = xfs_btree_check_block(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(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;
}
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Christoph Hellwig 已提交
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713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741
/*
 * 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 */
{
	struct xfs_btree_block	*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 */
	struct xfs_btree_block	*block;		/* btree root block */
	xfs_btree_cur_t		*cur;		/* bmap btree cursor */
	xfs_bmbt_rec_host_t	*ep;		/* extent record pointer */
	int			error;		/* error return value */
	xfs_extnum_t		i, cnt;		/* extent record index */
	xfs_ifork_t		*ifp;		/* inode fork pointer */
	xfs_bmbt_key_t		*kp;		/* root block key pointer */
	xfs_mount_t		*mp;		/* mount structure */
	xfs_extnum_t		nextents;	/* number of file extents */
	xfs_bmbt_ptr_t		*pp;		/* root block address pointer */
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Linus Torvalds 已提交
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743
	mp = ip->i_mount;
744 745
	ifp = XFS_IFORK_PTR(ip, whichfork);
	ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS);
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747 748 749 750 751
	/*
	 * Make space in the inode incore.
	 */
	xfs_iroot_realloc(ip, 1, whichfork);
	ifp->if_flags |= XFS_IFBROOT;
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753 754 755 756
	/*
	 * Fill in the root.
	 */
	block = ifp->if_broot;
757 758 759 760 761 762 763 764
	if (xfs_sb_version_hascrc(&mp->m_sb))
		xfs_btree_init_block_int(mp, block, XFS_BUF_DADDR_NULL,
				 XFS_BMAP_CRC_MAGIC, 1, 1, ip->i_ino,
				 XFS_BTREE_LONG_PTRS | XFS_BTREE_CRC_BLOCKS);
	else
		xfs_btree_init_block_int(mp, block, XFS_BUF_DADDR_NULL,
				 XFS_BMAP_MAGIC, 1, 1, ip->i_ino,
				 XFS_BTREE_LONG_PTRS);
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Christoph Hellwig 已提交
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766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816
	/*
	 * Need a cursor.  Can't allocate until bb_level is filled in.
	 */
	cur = xfs_bmbt_init_cursor(mp, tp, 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);
	memset(&args, 0, sizeof(args));
	args.tp = tp;
	args.mp = mp;
	args.firstblock = *firstblock;
	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.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(tp, ip, XFS_TRANS_DQ_BCOUNT, 1L);
	abp = xfs_btree_get_bufl(mp, tp, args.fsbno, 0);
	/*
	 * Fill in the child block.
	 */
	abp->b_ops = &xfs_bmbt_buf_ops;
	ablock = XFS_BUF_TO_BLOCK(abp);
817 818 819 820 821 822 823 824 825
	if (xfs_sb_version_hascrc(&mp->m_sb))
		xfs_btree_init_block_int(mp, ablock, abp->b_bn,
				XFS_BMAP_CRC_MAGIC, 0, 0, ip->i_ino,
				XFS_BTREE_LONG_PTRS | XFS_BTREE_CRC_BLOCKS);
	else
		xfs_btree_init_block_int(mp, ablock, abp->b_bn,
				XFS_BMAP_MAGIC, 0, 0, ip->i_ino,
				XFS_BTREE_LONG_PTRS);

826 827 828 829 830 831 832 833
	arp = XFS_BMBT_REC_ADDR(mp, ablock, 1);
	nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
	for (cnt = i = 0; i < nextents; i++) {
		ep = xfs_iext_get_ext(ifp, i);
		if (!isnullstartblock(xfs_bmbt_get_startblock(ep))) {
			arp->l0 = cpu_to_be64(ep->l0);
			arp->l1 = cpu_to_be64(ep->l1);
			arp++; cnt++;
L
Linus Torvalds 已提交
834
		}
835 836 837
	}
	ASSERT(cnt == XFS_IFORK_NEXTENTS(ip, whichfork));
	xfs_btree_set_numrecs(ablock, cnt);
L
Linus Torvalds 已提交
838

839 840 841 842 843 844 845 846 847
	/*
	 * Fill in the root key and pointer.
	 */
	kp = XFS_BMBT_KEY_ADDR(mp, block, 1);
	arp = XFS_BMBT_REC_ADDR(mp, ablock, 1);
	kp->br_startoff = cpu_to_be64(xfs_bmbt_disk_get_startoff(arp));
	pp = XFS_BMBT_PTR_ADDR(mp, block, 1, xfs_bmbt_get_maxrecs(cur,
						be16_to_cpu(block->bb_level)));
	*pp = cpu_to_be64(args.fsbno);
C
Christoph Hellwig 已提交
848

849 850 851 852 853 854 855 856 857 858 859
	/*
	 * Do all this logging at the end so that
	 * the root is at the right level.
	 */
	xfs_btree_log_block(cur, abp, XFS_BB_ALL_BITS);
	xfs_btree_log_recs(cur, abp, 1, be16_to_cpu(ablock->bb_numrecs));
	ASSERT(*curp == NULL);
	*curp = cur;
	*logflagsp = XFS_ILOG_CORE | xfs_ilog_fbroot(whichfork);
	return 0;
}
C
Christoph Hellwig 已提交
860

861 862 863 864 865 866
/*
 * 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).
 */
867 868 869 870 871 872 873 874 875 876 877
void
xfs_bmap_local_to_extents_empty(
	struct xfs_inode	*ip,
	int			whichfork)
{
	struct xfs_ifork	*ifp = XFS_IFORK_PTR(ip, whichfork);

	ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
	ASSERT(ifp->if_bytes == 0);
	ASSERT(XFS_IFORK_NEXTENTS(ip, whichfork) == 0);

878
	xfs_bmap_forkoff_reset(ip, whichfork);
879 880 881 882 883 884
	ifp->if_flags &= ~XFS_IFINLINE;
	ifp->if_flags |= XFS_IFEXTENTS;
	XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS);
}


885 886 887 888 889 890 891 892
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,
893 894
	void		(*init_fn)(struct xfs_trans *tp,
				   struct xfs_buf *bp,
895 896 897
				   struct xfs_inode *ip,
				   struct xfs_ifork *ifp))
{
898
	int		error = 0;
899 900
	int		flags;		/* logging flags returned */
	xfs_ifork_t	*ifp;		/* inode fork pointer */
901 902 903
	xfs_alloc_arg_t	args;		/* allocation arguments */
	xfs_buf_t	*bp;		/* buffer for extent block */
	xfs_bmbt_rec_host_t *ep;	/* extent record pointer */
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Christoph Hellwig 已提交
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905 906 907 908 909 910 911
	/*
	 * 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(!(S_ISREG(ip->i_d.di_mode) && whichfork == XFS_DATA_FORK));
	ifp = XFS_IFORK_PTR(ip, whichfork);
	ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
912 913 914 915 916 917 918

	if (!ifp->if_bytes) {
		xfs_bmap_local_to_extents_empty(ip, whichfork);
		flags = XFS_ILOG_CORE;
		goto done;
	}

919 920
	flags = 0;
	error = 0;
921 922 923 924 925 926 927 928 929 930 931 932 933
	ASSERT((ifp->if_flags & (XFS_IFINLINE|XFS_IFEXTENTS|XFS_IFEXTIREC)) ==
								XFS_IFINLINE);
	memset(&args, 0, sizeof(args));
	args.tp = tp;
	args.mp = ip->i_mount;
	args.firstblock = *firstblock;
	/*
	 * 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;
934
	} else {
935 936
		args.fsbno = *firstblock;
		args.type = XFS_ALLOCTYPE_NEAR_BNO;
937
	}
938 939 940 941 942 943 944 945 946 947 948 949
	args.total = total;
	args.minlen = args.maxlen = args.prod = 1;
	error = xfs_alloc_vextent(&args);
	if (error)
		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);

950 951 952 953 954
	/*
	 * Initialise the block and copy the data
	 *
	 * Note: init_fn must set the buffer log item type correctly!
	 */
955 956 957 958 959 960
	init_fn(tp, bp, ip, ifp);

	/* account for the change in fork size and log everything */
	xfs_trans_log_buf(tp, bp, 0, ifp->if_bytes - 1);
	xfs_idata_realloc(ip, -ifp->if_bytes, whichfork);
	xfs_bmap_local_to_extents_empty(ip, whichfork);
961
	flags |= XFS_ILOG_CORE;
962 963 964 965 966 967 968 969 970 971 972 973 974

	xfs_iext_add(ifp, 0, 1);
	ep = xfs_iext_get_ext(ifp, 0);
	xfs_bmbt_set_allf(ep, 0, args.fsbno, 1, XFS_EXT_NORM);
	trace_xfs_bmap_post_update(ip, 0,
			whichfork == XFS_ATTR_FORK ? BMAP_ATTRFORK : 0,
			_THIS_IP_);
	XFS_IFORK_NEXT_SET(ip, whichfork, 1);
	ip->i_d.di_nblocks = 1;
	xfs_trans_mod_dquot_byino(tp, ip,
		XFS_TRANS_DQ_BCOUNT, 1L);
	flags |= xfs_ilog_fext(whichfork);

975 976 977 978
done:
	*logflagsp = flags;
	return error;
}
C
Christoph Hellwig 已提交
979

980 981 982 983 984 985 986 987 988 989 990 991 992 993 994
/*
 * 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 */
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Christoph Hellwig 已提交
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996 997 998 999 1000 1001 1002 1003 1004 1005
	mp = ip->i_mount;
	if (ip->i_df.if_broot_bytes <= XFS_IFORK_DSIZE(ip))
		*flags |= XFS_ILOG_DBROOT;
	else {
		cur = xfs_bmbt_init_cursor(mp, tp, 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;
		/* must be at least one entry */
1006
		XFS_WANT_CORRUPTED_GOTO(mp, stat == 1, error0);
1007 1008 1009 1010
		if ((error = xfs_btree_new_iroot(cur, flags, &stat)))
			goto error0;
		if (stat == 0) {
			xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
D
Dave Chinner 已提交
1011
			return -ENOSPC;
L
Linus Torvalds 已提交
1012
		}
1013 1014 1015
		*firstblock = cur->bc_private.b.firstblock;
		cur->bc_private.b.allocated = 0;
		xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
L
Linus Torvalds 已提交
1016
	}
1017 1018 1019 1020 1021
	return 0;
error0:
	xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
	return error;
}
1022

1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035
/*
 * 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 */
1036

1037 1038 1039 1040 1041
	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);
1042 1043
	if (cur) {
		cur->bc_private.b.allocated = 0;
1044 1045
		xfs_btree_del_cursor(cur,
			error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
1046
	}
L
Linus Torvalds 已提交
1047 1048 1049
	return error;
}

1050 1051 1052 1053 1054 1055 1056 1057 1058
/*
 * Called from xfs_bmap_add_attrfork to handle local format files. Each
 * different data fork content type needs a different callout to do the
 * conversion. Some are basic and only require special block initialisation
 * callouts for the data formating, others (directories) are so specialised they
 * handle everything themselves.
 *
 * XXX (dgc): investigate whether directory conversion can use the generic
 * formatting callout. It should be possible - it's just a very complex
1059
 * formatter.
1060 1061 1062 1063 1064 1065 1066 1067 1068 1069
 */
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 */
1070

1071 1072
	if (ip->i_df.if_bytes <= XFS_IFORK_DSIZE(ip))
		return 0;
1073

1074 1075
	if (S_ISDIR(ip->i_d.di_mode)) {
		memset(&dargs, 0, sizeof(dargs));
1076
		dargs.geo = ip->i_mount->m_dir_geo;
1077 1078 1079
		dargs.dp = ip;
		dargs.firstblock = firstblock;
		dargs.flist = flist;
1080
		dargs.total = dargs.geo->fsbcount;
1081 1082 1083
		dargs.whichfork = XFS_DATA_FORK;
		dargs.trans = tp;
		return xfs_dir2_sf_to_block(&dargs);
L
Linus Torvalds 已提交
1084
	}
1085

1086 1087 1088 1089
	if (S_ISLNK(ip->i_d.di_mode))
		return xfs_bmap_local_to_extents(tp, ip, firstblock, 1,
						 flags, XFS_DATA_FORK,
						 xfs_symlink_local_to_remote);
1090

1091 1092
	/* should only be called for types that support local format data */
	ASSERT(0);
D
Dave Chinner 已提交
1093
	return -EFSCORRUPTED;
1094
}
C
Christoph Hellwig 已提交
1095

1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114
/*
 * 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 */
	int			size,		/* space new attribute needs */
	int			rsvd)		/* xact may use reserved blks */
{
	xfs_fsblock_t		firstblock;	/* 1st block/ag allocated */
	xfs_bmap_free_t		flist;		/* freed extent records */
	xfs_mount_t		*mp;		/* mount structure */
	xfs_trans_t		*tp;		/* transaction pointer */
	int			blks;		/* space reservation */
	int			version = 1;	/* superblock attr version */
	int			committed;	/* xaction was committed */
	int			logflags;	/* logging flags */
	int			error;		/* error return value */
C
Christoph Hellwig 已提交
1115

1116
	ASSERT(XFS_IFORK_Q(ip) == 0);
L
Linus Torvalds 已提交
1117

1118 1119 1120 1121 1122 1123
	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;
1124
	error = xfs_trans_reserve(tp, &M_RES(mp)->tr_addafork, blks, 0);
1125
	if (error) {
1126
		xfs_trans_cancel(tp);
1127 1128
		return error;
	}
1129 1130 1131 1132
	xfs_ilock(ip, XFS_ILOCK_EXCL);
	error = xfs_trans_reserve_quota_nblks(tp, ip, blks, 0, rsvd ?
			XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES :
			XFS_QMOPT_RES_REGBLKS);
1133 1134
	if (error)
		goto trans_cancel;
1135
	if (XFS_IFORK_Q(ip))
1136
		goto trans_cancel;
1137
	if (ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS) {
L
Linus Torvalds 已提交
1138
		/*
1139
		 * For inodes coming from pre-6.2 filesystems.
L
Linus Torvalds 已提交
1140
		 */
1141 1142 1143 1144
		ASSERT(ip->i_d.di_aformat == 0);
		ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS;
	}
	ASSERT(ip->i_d.di_anextents == 0);
C
Christoph Hellwig 已提交
1145

1146
	xfs_trans_ijoin(tp, ip, 0);
1147
	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
L
Linus Torvalds 已提交
1148

1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163
	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:
		ip->i_d.di_forkoff = xfs_attr_shortform_bytesfit(ip, size);
		if (!ip->i_d.di_forkoff)
			ip->i_d.di_forkoff = xfs_default_attroffset(ip) >> 3;
		else if (mp->m_flags & XFS_MOUNT_ATTR2)
			version = 2;
L
Linus Torvalds 已提交
1164
		break;
1165 1166
	default:
		ASSERT(0);
D
Dave Chinner 已提交
1167
		error = -EINVAL;
1168
		goto trans_cancel;
1169
	}
L
Linus Torvalds 已提交
1170

1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190
	ASSERT(ip->i_afp == NULL);
	ip->i_afp = kmem_zone_zalloc(xfs_ifork_zone, KM_SLEEP);
	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;
L
Linus Torvalds 已提交
1191 1192
		break;
	}
1193 1194 1195
	if (logflags)
		xfs_trans_log_inode(tp, ip, logflags);
	if (error)
1196
		goto bmap_cancel;
1197 1198
	if (!xfs_sb_version_hasattr(&mp->m_sb) ||
	   (!xfs_sb_version_hasattr2(&mp->m_sb) && version == 2)) {
1199
		bool log_sb = false;
1200 1201 1202 1203

		spin_lock(&mp->m_sb_lock);
		if (!xfs_sb_version_hasattr(&mp->m_sb)) {
			xfs_sb_version_addattr(&mp->m_sb);
1204
			log_sb = true;
1205 1206 1207
		}
		if (!xfs_sb_version_hasattr2(&mp->m_sb) && version == 2) {
			xfs_sb_version_addattr2(&mp->m_sb);
1208
			log_sb = true;
1209
		}
1210
		spin_unlock(&mp->m_sb_lock);
1211 1212
		if (log_sb)
			xfs_log_sb(tp);
L
Linus Torvalds 已提交
1213
	}
1214 1215 1216

	error = xfs_bmap_finish(&tp, &flist, &committed);
	if (error)
1217
		goto bmap_cancel;
1218
	error = xfs_trans_commit(tp);
1219 1220 1221 1222
	xfs_iunlock(ip, XFS_ILOCK_EXCL);
	return error;

bmap_cancel:
1223
	xfs_bmap_cancel(&flist);
1224
trans_cancel:
1225
	xfs_trans_cancel(tp);
1226 1227
	xfs_iunlock(ip, XFS_ILOCK_EXCL);
	return error;
L
Linus Torvalds 已提交
1228 1229 1230
}

/*
1231
 * Internal and external extent tree search functions.
L
Linus Torvalds 已提交
1232
 */
1233

1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257
/*
 * 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 */
{
	struct xfs_btree_block	*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 */
	__be64			*pp;	/* pointer to block address */
	/* REFERENCED */
	xfs_extnum_t		room;	/* number of entries there's room for */
1258

1259 1260 1261 1262 1263 1264
	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;
L
Linus Torvalds 已提交
1265
	/*
1266
	 * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
L
Linus Torvalds 已提交
1267
	 */
1268 1269 1270 1271
	level = be16_to_cpu(block->bb_level);
	ASSERT(level > 0);
	pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes);
	bno = be64_to_cpu(*pp);
C
Christoph Hellwig 已提交
1272
	ASSERT(bno != NULLFSBLOCK);
1273 1274
	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
Linus Torvalds 已提交
1275
	/*
1276 1277
	 * Go down the tree until leaf level is reached, following the first
	 * pointer (leftmost) at each level.
L
Linus Torvalds 已提交
1278
	 */
1279 1280 1281 1282 1283 1284 1285 1286 1287 1288
	while (level-- > 0) {
		error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
				XFS_BMAP_BTREE_REF, &xfs_bmbt_buf_ops);
		if (error)
			return error;
		block = XFS_BUF_TO_BLOCK(bp);
		if (level == 0)
			break;
		pp = XFS_BMBT_PTR_ADDR(mp, block, 1, mp->m_bmap_dmxr[1]);
		bno = be64_to_cpu(*pp);
1289 1290
		XFS_WANT_CORRUPTED_GOTO(mp,
			XFS_FSB_SANITY_CHECK(mp, bno), error0);
1291
		xfs_trans_brelse(tp, bp);
L
Linus Torvalds 已提交
1292 1293
	}
	/*
1294
	 * Here with bp and block set to the leftmost leaf node in the tree.
L
Linus Torvalds 已提交
1295
	 */
1296 1297
	room = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
	i = 0;
L
Linus Torvalds 已提交
1298
	/*
1299
	 * Loop over all leaf nodes.  Copy information to the extent records.
L
Linus Torvalds 已提交
1300
	 */
1301 1302 1303 1304 1305
	for (;;) {
		xfs_bmbt_rec_t	*frp;
		xfs_fsblock_t	nextbno;
		xfs_extnum_t	num_recs;
		xfs_extnum_t	start;
C
Christoph Hellwig 已提交
1306

1307 1308 1309 1310 1311 1312 1313 1314 1315
		num_recs = xfs_btree_get_numrecs(block);
		if (unlikely(i + num_recs > room)) {
			ASSERT(i + num_recs <= room);
			xfs_warn(ip->i_mount,
				"corrupt dinode %Lu, (btree extents).",
				(unsigned long long) ip->i_ino);
			XFS_CORRUPTION_ERROR("xfs_bmap_read_extents(1)",
				XFS_ERRLEVEL_LOW, ip->i_mount, block);
			goto error0;
L
Linus Torvalds 已提交
1316 1317
		}
		/*
1318
		 * Read-ahead the next leaf block, if any.
L
Linus Torvalds 已提交
1319
		 */
1320 1321 1322 1323
		nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
		if (nextbno != NULLFSBLOCK)
			xfs_btree_reada_bufl(mp, nextbno, 1,
					     &xfs_bmbt_buf_ops);
L
Linus Torvalds 已提交
1324
		/*
1325
		 * Copy records into the extent records.
L
Linus Torvalds 已提交
1326
		 */
1327 1328 1329 1330 1331 1332
		frp = XFS_BMBT_REC_ADDR(mp, block, 1);
		start = i;
		for (j = 0; j < num_recs; j++, i++, frp++) {
			xfs_bmbt_rec_host_t *trp = xfs_iext_get_ext(ifp, i);
			trp->l0 = be64_to_cpu(frp->l0);
			trp->l1 = be64_to_cpu(frp->l1);
L
Linus Torvalds 已提交
1333
		}
1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349
		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.
			 */
			if (unlikely(xfs_check_nostate_extents(ifp,
					start, num_recs))) {
				XFS_ERROR_REPORT("xfs_bmap_read_extents(2)",
						 XFS_ERRLEVEL_LOW,
						 ip->i_mount);
				goto error0;
			}
		}
		xfs_trans_brelse(tp, bp);
		bno = nextbno;
L
Linus Torvalds 已提交
1350
		/*
1351
		 * If we've reached the end, stop.
L
Linus Torvalds 已提交
1352
		 */
1353 1354 1355 1356 1357 1358 1359
		if (bno == NULLFSBLOCK)
			break;
		error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
				XFS_BMAP_BTREE_REF, &xfs_bmbt_buf_ops);
		if (error)
			return error;
		block = XFS_BUF_TO_BLOCK(bp);
L
Linus Torvalds 已提交
1360
	}
1361 1362 1363 1364 1365 1366
	ASSERT(i == (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)));
	ASSERT(i == XFS_IFORK_NEXTENTS(ip, whichfork));
	XFS_BMAP_TRACE_EXLIST(ip, i, whichfork);
	return 0;
error0:
	xfs_trans_brelse(tp, bp);
D
Dave Chinner 已提交
1367
	return -EFSCORRUPTED;
1368
}
1369 1370


1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388
/*
 * 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.
 */
STATIC xfs_bmbt_rec_host_t *		/* pointer to found extent entry */
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 */
{
	xfs_bmbt_rec_host_t *ep;		/* extent record pointer */
	xfs_extnum_t	lastx;		/* last extent index */
1389

1390 1391 1392 1393 1394 1395 1396 1397 1398
	/*
	 * Initialize the extent entry structure to catch access to
	 * uninitialized br_startblock field.
	 */
	gotp->br_startoff = 0xffa5a5a5a5a5a5a5LL;
	gotp->br_blockcount = 0xa55a5a5a5a5a5a5aLL;
	gotp->br_state = XFS_EXT_INVALID;
	gotp->br_startblock = 0xffffa5a5a5a5a5a5LL;
	prevp->br_startoff = NULLFILEOFF;
1399

1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415
	ep = xfs_iext_bno_to_ext(ifp, bno, &lastx);
	if (lastx > 0) {
		xfs_bmbt_get_all(xfs_iext_get_ext(ifp, lastx - 1), prevp);
	}
	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;
	}
	*lastxp = lastx;
	return ep;
L
Linus Torvalds 已提交
1416 1417
}

1418
/*
1419 1420 1421 1422 1423
 * 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.
1424
 */
1425 1426 1427 1428 1429 1430 1431 1432 1433
STATIC xfs_bmbt_rec_host_t *                 /* pointer to found extent entry */
xfs_bmap_search_extents(
	xfs_inode_t     *ip,            /* incore inode pointer */
	xfs_fileoff_t   bno,            /* block number searched for */
	int             fork,      	/* 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 */
1434
{
1435 1436
	xfs_ifork_t	*ifp;		/* inode fork pointer */
	xfs_bmbt_rec_host_t  *ep;            /* extent record pointer */
1437

1438 1439
	XFS_STATS_INC(xs_look_exlist);
	ifp = XFS_IFORK_PTR(ip, fork);
1440

1441
	ep = xfs_bmap_search_multi_extents(ifp, bno, eofp, lastxp, gotp, prevp);
1442

1443 1444 1445 1446 1447
	if (unlikely(!(gotp->br_startblock) && (*lastxp != NULLEXTNUM) &&
		     !(XFS_IS_REALTIME_INODE(ip) && fork == XFS_DATA_FORK))) {
		xfs_alert_tag(ip->i_mount, XFS_PTAG_FSBLOCK_ZERO,
				"Access to block zero in inode %llu "
				"start_block: %llx start_off: %llx "
1448
				"blkcnt: %llx extent-state: %x lastx: %x",
1449 1450 1451 1452 1453 1454 1455 1456
			(unsigned long long)ip->i_ino,
			(unsigned long long)gotp->br_startblock,
			(unsigned long long)gotp->br_startoff,
			(unsigned long long)gotp->br_blockcount,
			gotp->br_state, *lastxp);
		*lastxp = NULLEXTNUM;
		*eofp = 1;
		return NULL;
1457
	}
1458 1459
	return ep;
}
1460

1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490
/*
 * 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 */
	int		idx;			/* extent record index */
	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;
1491
	}
1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509
	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);
	for (idx = 0, lastaddr = 0, max = lowest; idx < nextents; idx++) {
		xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, idx);
		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);
1510
	}
1511 1512 1513 1514 1515
	*first_unused = max;
	return 0;
}

/*
1516
 * Returns the file-relative block number of the last block - 1 before
1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539
 * last_block (input value) in 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.
 */
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 */
	xfs_bmbt_rec_host_t *ep;		/* pointer to last extent */
	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)
D
Dave Chinner 已提交
1540
	       return -EIO;
1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554
	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;
1555
		else
1556
			*last_block = prev.br_startoff + prev.br_blockcount;
1557 1558
	}
	/*
1559
	 * Otherwise *last_block is already the right answer.
1560
	 */
1561 1562 1563
	return 0;
}

D
Dave Chinner 已提交
1564
int
1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579
xfs_bmap_last_extent(
	struct xfs_trans	*tp,
	struct xfs_inode	*ip,
	int			whichfork,
	struct xfs_bmbt_irec	*rec,
	int			*is_empty)
{
	struct xfs_ifork	*ifp = XFS_IFORK_PTR(ip, whichfork);
	int			error;
	int			nextents;

	if (!(ifp->if_flags & XFS_IFEXTENTS)) {
		error = xfs_iread_extents(tp, ip, whichfork);
		if (error)
			return error;
1580 1581
	}

1582 1583 1584 1585 1586
	nextents = ifp->if_bytes / sizeof(xfs_bmbt_rec_t);
	if (nextents == 0) {
		*is_empty = 1;
		return 0;
	}
1587

1588 1589
	xfs_bmbt_get_all(xfs_iext_get_ext(ifp, nextents - 1), rec);
	*is_empty = 0;
1590 1591 1592
	return 0;
}

1593 1594 1595 1596 1597 1598
/*
 * 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.
 *
1599
 * Returns 1 in bma->aeof if the file (fork) is empty as any new write will be
1600 1601 1602 1603 1604 1605
 * at, or past the EOF.
 */
STATIC int
xfs_bmap_isaeof(
	struct xfs_bmalloca	*bma,
	int			whichfork)
L
Linus Torvalds 已提交
1606
{
1607 1608 1609
	struct xfs_bmbt_irec	rec;
	int			is_empty;
	int			error;
L
Linus Torvalds 已提交
1610

1611 1612 1613
	bma->aeof = 0;
	error = xfs_bmap_last_extent(NULL, bma->ip, whichfork, &rec,
				     &is_empty);
1614
	if (error)
1615
		return error;
L
Linus Torvalds 已提交
1616

1617 1618 1619 1620 1621
	if (is_empty) {
		bma->aeof = 1;
		return 0;
	}

L
Linus Torvalds 已提交
1622
	/*
1623 1624
	 * Check if we are allocation or past the last extent, or at least into
	 * the last delayed allocated extent.
L
Linus Torvalds 已提交
1625
	 */
1626 1627 1628 1629 1630
	bma->aeof = bma->offset >= rec.br_startoff + rec.br_blockcount ||
		(bma->offset >= rec.br_startoff &&
		 isnullstartblock(rec.br_startblock));
	return 0;
}
L
Linus Torvalds 已提交
1631

1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645
/*
 * Returns the file-relative block number of the first block past eof in
 * 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.
 */
int
xfs_bmap_last_offset(
	struct xfs_inode	*ip,
	xfs_fileoff_t		*last_block,
	int			whichfork)
{
	struct xfs_bmbt_irec	rec;
	int			is_empty;
	int			error;
1646

1647
	*last_block = 0;
1648

1649 1650
	if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL)
		return 0;
1651

1652 1653
	if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
	    XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
D
Dave Chinner 已提交
1654
	       return -EIO;
1655

1656 1657
	error = xfs_bmap_last_extent(NULL, ip, whichfork, &rec, &is_empty);
	if (error || is_empty)
1658
		return error;
1659 1660

	*last_block = rec.br_startoff + rec.br_blockcount;
1661 1662 1663
	return 0;
}

1664 1665 1666 1667 1668 1669 1670 1671 1672
/*
 * 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 */
C
Christoph Hellwig 已提交
1673
{
1674 1675 1676 1677
	xfs_bmbt_rec_host_t *ep;	/* ptr to fork's extent */
	xfs_ifork_t	*ifp;		/* inode fork pointer */
	int		rval;		/* return value */
	xfs_bmbt_irec_t	s;		/* internal version of extent */
C
Christoph Hellwig 已提交
1678

1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695
#ifndef DEBUG
	if (whichfork == XFS_DATA_FORK)
		return XFS_ISIZE(ip) == ip->i_mount->m_sb.sb_blocksize;
#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);
	ep = xfs_iext_get_ext(ifp, 0);
	xfs_bmbt_get_all(ep, &s);
	rval = s.br_startoff == 0 && s.br_blockcount == 1;
	if (rval && whichfork == XFS_DATA_FORK)
		ASSERT(XFS_ISIZE(ip) == ip->i_mount->m_sb.sb_blocksize);
	return rval;
}
C
Christoph Hellwig 已提交
1696

1697 1698 1699
/*
 * Extent tree manipulation functions used during allocation.
 */
C
Christoph Hellwig 已提交
1700

1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723
/*
 * Convert a delayed allocation to a real allocation.
 */
STATIC int				/* error */
xfs_bmap_add_extent_delay_real(
	struct xfs_bmalloca	*bma)
{
	struct xfs_bmbt_irec	*new = &bma->got;
	int			diff;	/* temp value */
	xfs_bmbt_rec_host_t	*ep;	/* extent entry for idx */
	int			error;	/* error return value */
	int			i;	/* temp state */
	xfs_ifork_t		*ifp;	/* inode fork pointer */
	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 */
	xfs_filblks_t		da_new; /* new count del alloc blocks used */
	xfs_filblks_t		da_old; /* old count del alloc blocks used */
	xfs_filblks_t		temp=0;	/* value for da_new calculations */
	xfs_filblks_t		temp2=0;/* value for da_new calculations */
	int			tmp_rval;	/* partial logging flags */
1724
	struct xfs_mount	*mp;
C
Christoph Hellwig 已提交
1725

1726
	mp  = bma->tp ? bma->tp->t_mountp : NULL;
1727
	ifp = XFS_IFORK_PTR(bma->ip, XFS_DATA_FORK);
C
Christoph Hellwig 已提交
1728

1729 1730 1731 1732 1733
	ASSERT(bma->idx >= 0);
	ASSERT(bma->idx <= ifp->if_bytes / sizeof(struct xfs_bmbt_rec));
	ASSERT(!isnullstartblock(new->br_startblock));
	ASSERT(!bma->cur ||
	       (bma->cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL));
C
Christoph Hellwig 已提交
1734

1735
	XFS_STATS_INC(xs_add_exlist);
C
Christoph Hellwig 已提交
1736

1737 1738 1739
#define	LEFT		r[0]
#define	RIGHT		r[1]
#define	PREV		r[2]
C
Christoph Hellwig 已提交
1740 1741

	/*
1742
	 * Set up a bunch of variables to make the tests simpler.
C
Christoph Hellwig 已提交
1743
	 */
1744 1745 1746 1747 1748 1749 1750 1751 1752
	ep = xfs_iext_get_ext(ifp, bma->idx);
	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);

	da_old = startblockval(PREV.br_startblock);
	da_new = 0;

C
Christoph Hellwig 已提交
1753
	/*
1754 1755
	 * Set flags determining what part of the previous delayed allocation
	 * extent is being replaced by a real allocation.
C
Christoph Hellwig 已提交
1756
	 */
1757 1758 1759 1760
	if (PREV.br_startoff == new->br_startoff)
		state |= BMAP_LEFT_FILLING;
	if (PREV.br_startoff + PREV.br_blockcount == new_endoff)
		state |= BMAP_RIGHT_FILLING;
C
Christoph Hellwig 已提交
1761 1762

	/*
1763 1764
	 * Check and set flags if this segment has a left neighbor.
	 * Don't set contiguous if the combined extent would be too large.
C
Christoph Hellwig 已提交
1765
	 */
1766 1767 1768
	if (bma->idx > 0) {
		state |= BMAP_LEFT_VALID;
		xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx - 1), &LEFT);
1769

1770 1771
		if (isnullstartblock(LEFT.br_startblock))
			state |= BMAP_LEFT_DELAY;
1772 1773
	}

1774 1775 1776 1777 1778 1779
	if ((state & BMAP_LEFT_VALID) && !(state & BMAP_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 |= BMAP_LEFT_CONTIG;
1780

L
Linus Torvalds 已提交
1781
	/*
1782 1783 1784
	 * 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.
L
Linus Torvalds 已提交
1785
	 */
1786 1787 1788
	if (bma->idx < bma->ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1) {
		state |= BMAP_RIGHT_VALID;
		xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx + 1), &RIGHT);
1789

1790 1791
		if (isnullstartblock(RIGHT.br_startblock))
			state |= BMAP_RIGHT_DELAY;
L
Linus Torvalds 已提交
1792
	}
1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807

	if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_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 & (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
		       BMAP_RIGHT_FILLING)) !=
		      (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
		       BMAP_RIGHT_FILLING) ||
	     LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
			<= MAXEXTLEN))
		state |= BMAP_RIGHT_CONTIG;

	error = 0;
L
Linus Torvalds 已提交
1808
	/*
1809
	 * Switch out based on the FILLING and CONTIG state bits.
L
Linus Torvalds 已提交
1810
	 */
1811 1812 1813 1814
	switch (state & (BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
			 BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG)) {
	case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
	     BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
L
Linus Torvalds 已提交
1815
		/*
1816 1817
		 * Filling in all of a previously delayed allocation extent.
		 * The left and right neighbors are both contiguous with new.
L
Linus Torvalds 已提交
1818
		 */
1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836
		bma->idx--;
		trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
		xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx),
			LEFT.br_blockcount + PREV.br_blockcount +
			RIGHT.br_blockcount);
		trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);

		xfs_iext_remove(bma->ip, bma->idx + 1, 2, state);
		bma->ip->i_d.di_nextents--;
		if (bma->cur == NULL)
			rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
		else {
			rval = XFS_ILOG_CORE;
			error = xfs_bmbt_lookup_eq(bma->cur, RIGHT.br_startoff,
					RIGHT.br_startblock,
					RIGHT.br_blockcount, &i);
			if (error)
				goto done;
1837
			XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
1838 1839 1840
			error = xfs_btree_delete(bma->cur, &i);
			if (error)
				goto done;
1841
			XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
1842 1843 1844
			error = xfs_btree_decrement(bma->cur, 0, &i);
			if (error)
				goto done;
1845
			XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856
			error = xfs_bmbt_update(bma->cur, LEFT.br_startoff,
					LEFT.br_startblock,
					LEFT.br_blockcount +
					PREV.br_blockcount +
					RIGHT.br_blockcount, LEFT.br_state);
			if (error)
				goto done;
		}
		break;

	case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
1857
		/*
1858 1859
		 * Filling in all of a previously delayed allocation extent.
		 * The left neighbor is contiguous, the right is not.
1860
		 */
1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877
		bma->idx--;

		trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
		xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx),
			LEFT.br_blockcount + PREV.br_blockcount);
		trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);

		xfs_iext_remove(bma->ip, bma->idx + 1, 1, state);
		if (bma->cur == NULL)
			rval = XFS_ILOG_DEXT;
		else {
			rval = 0;
			error = xfs_bmbt_lookup_eq(bma->cur, LEFT.br_startoff,
					LEFT.br_startblock, LEFT.br_blockcount,
					&i);
			if (error)
				goto done;
1878
			XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
1879 1880 1881 1882 1883 1884 1885 1886 1887 1888
			error = xfs_bmbt_update(bma->cur, LEFT.br_startoff,
					LEFT.br_startblock,
					LEFT.br_blockcount +
					PREV.br_blockcount, LEFT.br_state);
			if (error)
				goto done;
		}
		break;

	case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
1889
		/*
1890 1891
		 * Filling in all of a previously delayed allocation extent.
		 * The right neighbor is contiguous, the left is not.
1892
		 */
1893 1894 1895 1896 1897
		trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
		xfs_bmbt_set_startblock(ep, new->br_startblock);
		xfs_bmbt_set_blockcount(ep,
			PREV.br_blockcount + RIGHT.br_blockcount);
		trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
1898

1899 1900 1901 1902 1903 1904 1905 1906 1907 1908
		xfs_iext_remove(bma->ip, bma->idx + 1, 1, state);
		if (bma->cur == NULL)
			rval = XFS_ILOG_DEXT;
		else {
			rval = 0;
			error = xfs_bmbt_lookup_eq(bma->cur, RIGHT.br_startoff,
					RIGHT.br_startblock,
					RIGHT.br_blockcount, &i);
			if (error)
				goto done;
1909
			XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
1910 1911 1912 1913 1914 1915 1916 1917 1918 1919
			error = xfs_bmbt_update(bma->cur, PREV.br_startoff,
					new->br_startblock,
					PREV.br_blockcount +
					RIGHT.br_blockcount, PREV.br_state);
			if (error)
				goto done;
		}
		break;

	case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
1920
		/*
1921 1922 1923
		 * Filling in all of a previously delayed allocation extent.
		 * Neither the left nor right neighbors are contiguous with
		 * the new one.
1924
		 */
1925 1926 1927
		trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
		xfs_bmbt_set_startblock(ep, new->br_startblock);
		trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
1928

1929 1930 1931 1932 1933 1934 1935 1936 1937 1938
		bma->ip->i_d.di_nextents++;
		if (bma->cur == NULL)
			rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
		else {
			rval = XFS_ILOG_CORE;
			error = xfs_bmbt_lookup_eq(bma->cur, new->br_startoff,
					new->br_startblock, new->br_blockcount,
					&i);
			if (error)
				goto done;
1939
			XFS_WANT_CORRUPTED_GOTO(mp, i == 0, done);
1940 1941 1942 1943
			bma->cur->bc_rec.b.br_state = XFS_EXT_NORM;
			error = xfs_btree_insert(bma->cur, &i);
			if (error)
				goto done;
1944
			XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
1945 1946
		}
		break;
L
Linus Torvalds 已提交
1947

1948
	case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG:
L
Linus Torvalds 已提交
1949
		/*
1950 1951
		 * Filling in the first part of a previous delayed allocation.
		 * The left neighbor is contiguous.
L
Linus Torvalds 已提交
1952
		 */
1953 1954 1955 1956 1957 1958
		trace_xfs_bmap_pre_update(bma->ip, bma->idx - 1, state, _THIS_IP_);
		xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx - 1),
			LEFT.br_blockcount + new->br_blockcount);
		xfs_bmbt_set_startoff(ep,
			PREV.br_startoff + new->br_blockcount);
		trace_xfs_bmap_post_update(bma->ip, bma->idx - 1, state, _THIS_IP_);
L
Linus Torvalds 已提交
1959

1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971
		temp = PREV.br_blockcount - new->br_blockcount;
		trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
		xfs_bmbt_set_blockcount(ep, temp);
		if (bma->cur == NULL)
			rval = XFS_ILOG_DEXT;
		else {
			rval = 0;
			error = xfs_bmbt_lookup_eq(bma->cur, LEFT.br_startoff,
					LEFT.br_startblock, LEFT.br_blockcount,
					&i);
			if (error)
				goto done;
1972
			XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
1973 1974 1975 1976 1977
			error = xfs_bmbt_update(bma->cur, LEFT.br_startoff,
					LEFT.br_startblock,
					LEFT.br_blockcount +
					new->br_blockcount,
					LEFT.br_state);
C
Christoph Hellwig 已提交
1978
			if (error)
L
Linus Torvalds 已提交
1979 1980
				goto done;
		}
1981 1982 1983 1984 1985 1986 1987 1988 1989
		da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
			startblockval(PREV.br_startblock));
		xfs_bmbt_set_startblock(ep, nullstartblock(da_new));
		trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);

		bma->idx--;
		break;

	case BMAP_LEFT_FILLING:
L
Linus Torvalds 已提交
1990
		/*
1991 1992
		 * Filling in the first part of a previous delayed allocation.
		 * The left neighbor is not contiguous.
L
Linus Torvalds 已提交
1993
		 */
1994 1995 1996 1997 1998 1999 2000 2001
		trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
		xfs_bmbt_set_startoff(ep, new_endoff);
		temp = PREV.br_blockcount - new->br_blockcount;
		xfs_bmbt_set_blockcount(ep, temp);
		xfs_iext_insert(bma->ip, bma->idx, 1, new, state);
		bma->ip->i_d.di_nextents++;
		if (bma->cur == NULL)
			rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
L
Linus Torvalds 已提交
2002
		else {
2003 2004 2005 2006 2007 2008
			rval = XFS_ILOG_CORE;
			error = xfs_bmbt_lookup_eq(bma->cur, new->br_startoff,
					new->br_startblock, new->br_blockcount,
					&i);
			if (error)
				goto done;
2009
			XFS_WANT_CORRUPTED_GOTO(mp, i == 0, done);
2010 2011 2012
			bma->cur->bc_rec.b.br_state = XFS_EXT_NORM;
			error = xfs_btree_insert(bma->cur, &i);
			if (error)
L
Linus Torvalds 已提交
2013
				goto done;
2014
			XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
L
Linus Torvalds 已提交
2015
		}
2016

2017 2018 2019 2020 2021 2022 2023
		if (xfs_bmap_needs_btree(bma->ip, XFS_DATA_FORK)) {
			error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
					bma->firstblock, bma->flist,
					&bma->cur, 1, &tmp_rval, XFS_DATA_FORK);
			rval |= tmp_rval;
			if (error)
				goto done;
L
Linus Torvalds 已提交
2024
		}
2025 2026 2027 2028 2029 2030
		da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
			startblockval(PREV.br_startblock) -
			(bma->cur ? bma->cur->bc_private.b.allocated : 0));
		ep = xfs_iext_get_ext(ifp, bma->idx + 1);
		xfs_bmbt_set_startblock(ep, nullstartblock(da_new));
		trace_xfs_bmap_post_update(bma->ip, bma->idx + 1, state, _THIS_IP_);
L
Linus Torvalds 已提交
2031 2032
		break;

2033
	case BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
L
Linus Torvalds 已提交
2034
		/*
2035 2036
		 * Filling in the last part of a previous delayed allocation.
		 * The right neighbor is contiguous with the new allocation.
L
Linus Torvalds 已提交
2037
		 */
2038 2039
		temp = PREV.br_blockcount - new->br_blockcount;
		trace_xfs_bmap_pre_update(bma->ip, bma->idx + 1, state, _THIS_IP_);
L
Linus Torvalds 已提交
2040
		xfs_bmbt_set_blockcount(ep, temp);
2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054
		xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, bma->idx + 1),
			new->br_startoff, new->br_startblock,
			new->br_blockcount + RIGHT.br_blockcount,
			RIGHT.br_state);
		trace_xfs_bmap_post_update(bma->ip, bma->idx + 1, state, _THIS_IP_);
		if (bma->cur == NULL)
			rval = XFS_ILOG_DEXT;
		else {
			rval = 0;
			error = xfs_bmbt_lookup_eq(bma->cur, RIGHT.br_startoff,
					RIGHT.br_startblock,
					RIGHT.br_blockcount, &i);
			if (error)
				goto done;
2055
			XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2056 2057 2058 2059 2060 2061 2062
			error = xfs_bmbt_update(bma->cur, new->br_startoff,
					new->br_startblock,
					new->br_blockcount +
					RIGHT.br_blockcount,
					RIGHT.br_state);
			if (error)
				goto done;
L
Linus Torvalds 已提交
2063
		}
2064 2065 2066 2067 2068 2069 2070 2071

		da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
			startblockval(PREV.br_startblock));
		trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
		xfs_bmbt_set_startblock(ep, nullstartblock(da_new));
		trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);

		bma->idx++;
L
Linus Torvalds 已提交
2072 2073
		break;

2074
	case BMAP_RIGHT_FILLING:
L
Linus Torvalds 已提交
2075
		/*
2076 2077
		 * Filling in the last part of a previous delayed allocation.
		 * The right neighbor is not contiguous.
L
Linus Torvalds 已提交
2078
		 */
2079 2080
		temp = PREV.br_blockcount - new->br_blockcount;
		trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
L
Linus Torvalds 已提交
2081
		xfs_bmbt_set_blockcount(ep, temp);
2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092
		xfs_iext_insert(bma->ip, bma->idx + 1, 1, new, state);
		bma->ip->i_d.di_nextents++;
		if (bma->cur == NULL)
			rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
		else {
			rval = XFS_ILOG_CORE;
			error = xfs_bmbt_lookup_eq(bma->cur, new->br_startoff,
					new->br_startblock, new->br_blockcount,
					&i);
			if (error)
				goto done;
2093
			XFS_WANT_CORRUPTED_GOTO(mp, i == 0, done);
2094 2095 2096 2097
			bma->cur->bc_rec.b.br_state = XFS_EXT_NORM;
			error = xfs_btree_insert(bma->cur, &i);
			if (error)
				goto done;
2098
			XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
L
Linus Torvalds 已提交
2099
		}
2100 2101 2102 2103 2104 2105 2106 2107

		if (xfs_bmap_needs_btree(bma->ip, XFS_DATA_FORK)) {
			error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
				bma->firstblock, bma->flist, &bma->cur, 1,
				&tmp_rval, XFS_DATA_FORK);
			rval |= tmp_rval;
			if (error)
				goto done;
L
Linus Torvalds 已提交
2108
		}
2109 2110 2111 2112 2113 2114 2115 2116
		da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
			startblockval(PREV.br_startblock) -
			(bma->cur ? bma->cur->bc_private.b.allocated : 0));
		ep = xfs_iext_get_ext(ifp, bma->idx);
		xfs_bmbt_set_startblock(ep, nullstartblock(da_new));
		trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);

		bma->idx++;
L
Linus Torvalds 已提交
2117 2118 2119 2120
		break;

	case 0:
		/*
2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138
		 * Filling in the middle part of a previous delayed allocation.
		 * Contiguity is impossible here.
		 * This case is avoided almost all the time.
		 *
		 * We start with a delayed allocation:
		 *
		 * +ddddddddddddddddddddddddddddddddddddddddddddddddddddddd+
		 *  PREV @ idx
		 *
	         * and we are allocating:
		 *                     +rrrrrrrrrrrrrrrrr+
		 *			      new
		 *
		 * and we set it up for insertion as:
		 * +ddddddddddddddddddd+rrrrrrrrrrrrrrrrr+ddddddddddddddddd+
		 *                            new
		 *  PREV @ idx          LEFT              RIGHT
		 *                      inserted at idx + 1
L
Linus Torvalds 已提交
2139
		 */
2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161
		temp = new->br_startoff - PREV.br_startoff;
		temp2 = PREV.br_startoff + PREV.br_blockcount - new_endoff;
		trace_xfs_bmap_pre_update(bma->ip, bma->idx, 0, _THIS_IP_);
		xfs_bmbt_set_blockcount(ep, temp);	/* truncate PREV */
		LEFT = *new;
		RIGHT.br_state = PREV.br_state;
		RIGHT.br_startblock = nullstartblock(
				(int)xfs_bmap_worst_indlen(bma->ip, temp2));
		RIGHT.br_startoff = new_endoff;
		RIGHT.br_blockcount = temp2;
		/* insert LEFT (r[0]) and RIGHT (r[1]) at the same time */
		xfs_iext_insert(bma->ip, bma->idx + 1, 2, &LEFT, state);
		bma->ip->i_d.di_nextents++;
		if (bma->cur == NULL)
			rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
		else {
			rval = XFS_ILOG_CORE;
			error = xfs_bmbt_lookup_eq(bma->cur, new->br_startoff,
					new->br_startblock, new->br_blockcount,
					&i);
			if (error)
				goto done;
2162
			XFS_WANT_CORRUPTED_GOTO(mp, i == 0, done);
2163 2164 2165 2166
			bma->cur->bc_rec.b.br_state = XFS_EXT_NORM;
			error = xfs_btree_insert(bma->cur, &i);
			if (error)
				goto done;
2167
			XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
L
Linus Torvalds 已提交
2168 2169
		}

2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182
		if (xfs_bmap_needs_btree(bma->ip, XFS_DATA_FORK)) {
			error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
					bma->firstblock, bma->flist, &bma->cur,
					1, &tmp_rval, XFS_DATA_FORK);
			rval |= tmp_rval;
			if (error)
				goto done;
		}
		temp = xfs_bmap_worst_indlen(bma->ip, temp);
		temp2 = xfs_bmap_worst_indlen(bma->ip, temp2);
		diff = (int)(temp + temp2 - startblockval(PREV.br_startblock) -
			(bma->cur ? bma->cur->bc_private.b.allocated : 0));
		if (diff > 0) {
2183 2184
			error = xfs_mod_fdblocks(bma->ip->i_mount,
						 -((int64_t)diff), false);
2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234
			ASSERT(!error);
			if (error)
				goto done;
		}

		ep = xfs_iext_get_ext(ifp, bma->idx);
		xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
		trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
		trace_xfs_bmap_pre_update(bma->ip, bma->idx + 2, state, _THIS_IP_);
		xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, bma->idx + 2),
			nullstartblock((int)temp2));
		trace_xfs_bmap_post_update(bma->ip, bma->idx + 2, state, _THIS_IP_);

		bma->idx++;
		da_new = temp + temp2;
		break;

	case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
	case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
	case BMAP_LEFT_FILLING | BMAP_RIGHT_CONTIG:
	case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
	case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
	case BMAP_LEFT_CONTIG:
	case BMAP_RIGHT_CONTIG:
		/*
		 * These cases are all impossible.
		 */
		ASSERT(0);
	}

	/* convert to a btree if necessary */
	if (xfs_bmap_needs_btree(bma->ip, XFS_DATA_FORK)) {
		int	tmp_logflags;	/* partial log flag return val */

		ASSERT(bma->cur == NULL);
		error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
				bma->firstblock, bma->flist, &bma->cur,
				da_old > 0, &tmp_logflags, XFS_DATA_FORK);
		bma->logflags |= tmp_logflags;
		if (error)
			goto done;
	}

	/* adjust for changes in reserved delayed indirect blocks */
	if (da_old || da_new) {
		temp = da_new;
		if (bma->cur)
			temp += bma->cur->bc_private.b.allocated;
		ASSERT(temp <= da_old);
		if (temp < da_old)
2235 2236
			xfs_mod_fdblocks(bma->ip->i_mount,
					(int64_t)(da_old - temp), false);
2237
	}
2238 2239 2240 2241 2242 2243

	/* clear out the allocated field, done with it now in any case. */
	if (bma->cur)
		bma->cur->bc_private.b.allocated = 0;

	xfs_bmap_check_leaf_extents(bma->cur, bma->ip, XFS_DATA_FORK);
L
Linus Torvalds 已提交
2244
done:
2245
	bma->logflags |= rval;
L
Linus Torvalds 已提交
2246
	return error;
2247 2248 2249
#undef	LEFT
#undef	RIGHT
#undef	PREV
L
Linus Torvalds 已提交
2250 2251 2252
}

/*
2253
 * Convert an unwritten allocation to a real allocation or vice versa.
L
Linus Torvalds 已提交
2254
 */
2255 2256 2257 2258 2259 2260 2261 2262 2263 2264
STATIC int				/* error */
xfs_bmap_add_extent_unwritten_real(
	struct xfs_trans	*tp,
	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 */
	xfs_bmbt_irec_t		*new,	/* new data to add to file extents */
	xfs_fsblock_t		*first,	/* pointer to firstblock variable */
	xfs_bmap_free_t		*flist,	/* list of extents to be freed */
	int			*logflagsp) /* inode logging flags */
L
Linus Torvalds 已提交
2265
{
2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277
	xfs_btree_cur_t		*cur;	/* btree cursor */
	xfs_bmbt_rec_host_t	*ep;	/* extent entry for idx */
	int			error;	/* error return value */
	int			i;	/* temp state */
	xfs_ifork_t		*ifp;	/* inode fork pointer */
	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 */
2278
	struct xfs_mount	*mp = tp->t_mountp;
L
Linus Torvalds 已提交
2279

2280
	*logflagsp = 0;
L
Linus Torvalds 已提交
2281

2282 2283
	cur = *curp;
	ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
2284

2285 2286 2287 2288 2289 2290 2291 2292 2293
	ASSERT(*idx >= 0);
	ASSERT(*idx <= ifp->if_bytes / sizeof(struct xfs_bmbt_rec));
	ASSERT(!isnullstartblock(new->br_startblock));

	XFS_STATS_INC(xs_add_exlist);

#define	LEFT		r[0]
#define	RIGHT		r[1]
#define	PREV		r[2]
2294

L
Linus Torvalds 已提交
2295
	/*
2296
	 * Set up a bunch of variables to make the tests simpler.
L
Linus Torvalds 已提交
2297
	 */
2298 2299 2300 2301 2302 2303 2304 2305 2306 2307
	error = 0;
	ep = xfs_iext_get_ext(ifp, *idx);
	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);
2308

L
Linus Torvalds 已提交
2309
	/*
2310 2311
	 * Set flags determining what part of the previous oldext allocation
	 * extent is being replaced by a newext allocation.
L
Linus Torvalds 已提交
2312
	 */
2313 2314 2315 2316 2317
	if (PREV.br_startoff == new->br_startoff)
		state |= BMAP_LEFT_FILLING;
	if (PREV.br_startoff + PREV.br_blockcount == new_endoff)
		state |= BMAP_RIGHT_FILLING;

L
Linus Torvalds 已提交
2318
	/*
2319 2320
	 * Check and set flags if this segment has a left neighbor.
	 * Don't set contiguous if the combined extent would be too large.
L
Linus Torvalds 已提交
2321
	 */
2322 2323 2324 2325 2326 2327
	if (*idx > 0) {
		state |= BMAP_LEFT_VALID;
		xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx - 1), &LEFT);

		if (isnullstartblock(LEFT.br_startblock))
			state |= BMAP_LEFT_DELAY;
L
Linus Torvalds 已提交
2328
	}
2329 2330 2331 2332 2333 2334 2335 2336

	if ((state & BMAP_LEFT_VALID) && !(state & BMAP_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)
		state |= BMAP_LEFT_CONTIG;

L
Linus Torvalds 已提交
2337
	/*
2338 2339 2340
	 * 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.
L
Linus Torvalds 已提交
2341
	 */
2342 2343 2344 2345 2346
	if (*idx < ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1) {
		state |= BMAP_RIGHT_VALID;
		xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx + 1), &RIGHT);
		if (isnullstartblock(RIGHT.br_startblock))
			state |= BMAP_RIGHT_DELAY;
L
Linus Torvalds 已提交
2347
	}
2348

2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360
	if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_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 & (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
		       BMAP_RIGHT_FILLING)) !=
		      (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
		       BMAP_RIGHT_FILLING) ||
	     LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
			<= MAXEXTLEN))
		state |= BMAP_RIGHT_CONTIG;
2361

L
Linus Torvalds 已提交
2362
	/*
2363
	 * Switch out based on the FILLING and CONTIG state bits.
L
Linus Torvalds 已提交
2364
	 */
2365 2366 2367 2368 2369 2370 2371 2372 2373
	switch (state & (BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
			 BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG)) {
	case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
	     BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
		/*
		 * Setting all of a previous oldext extent to newext.
		 * The left and right neighbors are both contiguous with new.
		 */
		--*idx;
C
Christoph Hellwig 已提交
2374

2375 2376 2377 2378 2379
		trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
		xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx),
			LEFT.br_blockcount + PREV.br_blockcount +
			RIGHT.br_blockcount);
		trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
C
Christoph Hellwig 已提交
2380

2381 2382 2383 2384 2385 2386 2387 2388 2389 2390
		xfs_iext_remove(ip, *idx + 1, 2, state);
		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;
2391
			XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2392 2393
			if ((error = xfs_btree_delete(cur, &i)))
				goto done;
2394
			XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2395 2396
			if ((error = xfs_btree_decrement(cur, 0, &i)))
				goto done;
2397
			XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2398 2399
			if ((error = xfs_btree_delete(cur, &i)))
				goto done;
2400
			XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2401 2402
			if ((error = xfs_btree_decrement(cur, 0, &i)))
				goto done;
2403
			XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2404 2405 2406 2407 2408 2409 2410
			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;
		}
		break;
C
Christoph Hellwig 已提交
2411

2412 2413 2414 2415 2416 2417
	case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
		/*
		 * Setting all of a previous oldext extent to newext.
		 * The left neighbor is contiguous, the right is not.
		 */
		--*idx;
2418

2419 2420 2421 2422
		trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
		xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx),
			LEFT.br_blockcount + PREV.br_blockcount);
		trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
L
Linus Torvalds 已提交
2423

2424 2425 2426 2427 2428 2429 2430 2431 2432 2433
		xfs_iext_remove(ip, *idx + 1, 1, state);
		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;
2434
			XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2435 2436
			if ((error = xfs_btree_delete(cur, &i)))
				goto done;
2437
			XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2438 2439
			if ((error = xfs_btree_decrement(cur, 0, &i)))
				goto done;
2440
			XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2441 2442 2443 2444 2445 2446 2447
			if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
				LEFT.br_startblock,
				LEFT.br_blockcount + PREV.br_blockcount,
				LEFT.br_state)))
				goto done;
		}
		break;
L
Linus Torvalds 已提交
2448

2449
	case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
L
Linus Torvalds 已提交
2450
		/*
2451 2452
		 * Setting all of a previous oldext extent to newext.
		 * The right neighbor is contiguous, the left is not.
L
Linus Torvalds 已提交
2453
		 */
2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468
		trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
		xfs_bmbt_set_blockcount(ep,
			PREV.br_blockcount + RIGHT.br_blockcount);
		xfs_bmbt_set_state(ep, newext);
		trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
		xfs_iext_remove(ip, *idx + 1, 1, state);
		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;
2469
			XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2470 2471
			if ((error = xfs_btree_delete(cur, &i)))
				goto done;
2472
			XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2473 2474
			if ((error = xfs_btree_decrement(cur, 0, &i)))
				goto done;
2475
			XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2476 2477 2478 2479 2480
			if ((error = xfs_bmbt_update(cur, new->br_startoff,
				new->br_startblock,
				new->br_blockcount + RIGHT.br_blockcount,
				newext)))
				goto done;
L
Linus Torvalds 已提交
2481
		}
2482
		break;
2483

2484 2485 2486 2487 2488 2489 2490 2491 2492
	case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
		/*
		 * Setting all of a previous oldext extent to newext.
		 * Neither the left nor right neighbors are contiguous with
		 * the new one.
		 */
		trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
		xfs_bmbt_set_state(ep, newext);
		trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2493

2494 2495 2496 2497 2498 2499 2500 2501
		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;
2502
			XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2503 2504 2505 2506 2507 2508
			if ((error = xfs_bmbt_update(cur, new->br_startoff,
				new->br_startblock, new->br_blockcount,
				newext)))
				goto done;
		}
		break;
2509

2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520
	case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG:
		/*
		 * Setting the first part of a previous oldext extent to newext.
		 * The left neighbor is contiguous.
		 */
		trace_xfs_bmap_pre_update(ip, *idx - 1, state, _THIS_IP_);
		xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx - 1),
			LEFT.br_blockcount + new->br_blockcount);
		xfs_bmbt_set_startoff(ep,
			PREV.br_startoff + new->br_blockcount);
		trace_xfs_bmap_post_update(ip, *idx - 1, state, _THIS_IP_);
L
Linus Torvalds 已提交
2521

2522 2523 2524 2525 2526 2527
		trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
		xfs_bmbt_set_startblock(ep,
			new->br_startblock + new->br_blockcount);
		xfs_bmbt_set_blockcount(ep,
			PREV.br_blockcount - new->br_blockcount);
		trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2528

2529
		--*idx;
2530

2531 2532 2533 2534 2535 2536 2537 2538
		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;
2539
			XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553
			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_btree_decrement(cur, 0, &i)))
				goto done;
			error = xfs_bmbt_update(cur, LEFT.br_startoff,
				LEFT.br_startblock,
				LEFT.br_blockcount + new->br_blockcount,
				LEFT.br_state);
			if (error)
				goto done;
2554
		}
2555
		break;
2556

2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569
	case BMAP_LEFT_FILLING:
		/*
		 * Setting the first part of a previous oldext extent to newext.
		 * The left neighbor is not contiguous.
		 */
		trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
		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);
		trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
L
Linus Torvalds 已提交
2570

2571 2572 2573 2574 2575 2576 2577 2578 2579 2580
		xfs_iext_insert(ip, *idx, 1, new, state);
		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;
2581
			XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2582 2583 2584 2585 2586 2587 2588 2589 2590
			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_btree_insert(cur, &i)))
				goto done;
2591
			XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2592 2593
		}
		break;
L
Linus Torvalds 已提交
2594

2595 2596 2597 2598 2599 2600 2601 2602 2603
	case BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
		/*
		 * Setting the last part of a previous oldext extent to newext.
		 * The right neighbor is contiguous with the new allocation.
		 */
		trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
		xfs_bmbt_set_blockcount(ep,
			PREV.br_blockcount - new->br_blockcount);
		trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2604

2605
		++*idx;
L
Linus Torvalds 已提交
2606

2607 2608 2609 2610 2611
		trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
		xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, *idx),
			new->br_startoff, new->br_startblock,
			new->br_blockcount + RIGHT.br_blockcount, newext);
		trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
L
Linus Torvalds 已提交
2612

2613 2614 2615 2616 2617 2618 2619 2620
		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;
2621
			XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635
			if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
				PREV.br_startblock,
				PREV.br_blockcount - new->br_blockcount,
				oldext)))
				goto done;
			if ((error = xfs_btree_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;
		}
		break;
L
Linus Torvalds 已提交
2636

2637 2638 2639 2640 2641 2642 2643 2644 2645
	case BMAP_RIGHT_FILLING:
		/*
		 * Setting the last part of a previous oldext extent to newext.
		 * The right neighbor is not contiguous.
		 */
		trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
		xfs_bmbt_set_blockcount(ep,
			PREV.br_blockcount - new->br_blockcount);
		trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
L
Linus Torvalds 已提交
2646

2647 2648
		++*idx;
		xfs_iext_insert(ip, *idx, 1, new, state);
2649

2650 2651 2652 2653 2654 2655 2656 2657 2658
		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;
2659
			XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2660 2661 2662 2663 2664 2665 2666 2667 2668
			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;
2669
			XFS_WANT_CORRUPTED_GOTO(mp, i == 0, done);
2670 2671 2672
			cur->bc_rec.b.br_state = XFS_EXT_NORM;
			if ((error = xfs_btree_insert(cur, &i)))
				goto done;
2673
			XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2674 2675 2676 2677
		}
		break;

	case 0:
L
Linus Torvalds 已提交
2678
		/*
2679 2680 2681
		 * Setting the middle part of a previous oldext extent to
		 * newext.  Contiguity is impossible here.
		 * One extent becomes three extents.
L
Linus Torvalds 已提交
2682
		 */
2683 2684 2685 2686
		trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
		xfs_bmbt_set_blockcount(ep,
			new->br_startoff - PREV.br_startoff);
		trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2687

2688 2689 2690 2691 2692 2693
		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;
2694

2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706
		++*idx;
		xfs_iext_insert(ip, *idx, 2, &r[0], state);

		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;
2707
			XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718
			/* 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 */
			cur->bc_rec.b = PREV;
			cur->bc_rec.b.br_blockcount =
				new->br_startoff - PREV.br_startoff;
			if ((error = xfs_btree_insert(cur, &i)))
				goto done;
2719
			XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2720 2721 2722 2723 2724 2725 2726 2727 2728
			/*
			 * Reset the cursor to the position of the new extent
			 * we are about to insert as we can't trust it after
			 * the previous insert.
			 */
			if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
					new->br_startblock, new->br_blockcount,
					&i)))
				goto done;
2729
			XFS_WANT_CORRUPTED_GOTO(mp, i == 0, done);
2730 2731 2732 2733
			/* new middle extent - newext */
			cur->bc_rec.b.br_state = new->br_state;
			if ((error = xfs_btree_insert(cur, &i)))
				goto done;
2734
			XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2735
		}
L
Linus Torvalds 已提交
2736
		break;
2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747

	case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
	case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
	case BMAP_LEFT_FILLING | BMAP_RIGHT_CONTIG:
	case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
	case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
	case BMAP_LEFT_CONTIG:
	case BMAP_RIGHT_CONTIG:
		/*
		 * These cases are all impossible.
		 */
L
Linus Torvalds 已提交
2748 2749
		ASSERT(0);
	}
2750

2751 2752 2753 2754 2755 2756 2757 2758 2759 2760
	/* convert to a btree if necessary */
	if (xfs_bmap_needs_btree(ip, XFS_DATA_FORK)) {
		int	tmp_logflags;	/* partial log flag return val */

		ASSERT(cur == NULL);
		error = xfs_bmap_extents_to_btree(tp, ip, first, flist, &cur,
				0, &tmp_logflags, XFS_DATA_FORK);
		*logflagsp |= tmp_logflags;
		if (error)
			goto done;
L
Linus Torvalds 已提交
2761
	}
2762

2763 2764 2765 2766
	/* clear out the allocated field, done with it now in any case. */
	if (cur) {
		cur->bc_private.b.allocated = 0;
		*curp = cur;
L
Linus Torvalds 已提交
2767
	}
2768

2769 2770 2771
	xfs_bmap_check_leaf_extents(*curp, ip, XFS_DATA_FORK);
done:
	*logflagsp |= rval;
L
Linus Torvalds 已提交
2772
	return error;
2773 2774 2775
#undef	LEFT
#undef	RIGHT
#undef	PREV
L
Linus Torvalds 已提交
2776 2777 2778
}

/*
2779
 * Convert a hole to a delayed allocation.
L
Linus Torvalds 已提交
2780
 */
2781 2782 2783 2784 2785
STATIC void
xfs_bmap_add_extent_hole_delay(
	xfs_inode_t		*ip,	/* incore inode pointer */
	xfs_extnum_t		*idx,	/* extent number to update/insert */
	xfs_bmbt_irec_t		*new)	/* new data to add to file extents */
L
Linus Torvalds 已提交
2786
{
2787 2788 2789 2790 2791 2792 2793
	xfs_ifork_t		*ifp;	/* inode fork pointer */
	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 */
	xfs_filblks_t		temp=0;	/* temp for indirect calculations */
L
Linus Torvalds 已提交
2794

2795 2796 2797
	ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
	state = 0;
	ASSERT(isnullstartblock(new->br_startblock));
L
Linus Torvalds 已提交
2798 2799

	/*
2800
	 * Check and set flags if this segment has a left neighbor
L
Linus Torvalds 已提交
2801
	 */
2802 2803 2804 2805 2806 2807
	if (*idx > 0) {
		state |= BMAP_LEFT_VALID;
		xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx - 1), &left);

		if (isnullstartblock(left.br_startblock))
			state |= BMAP_LEFT_DELAY;
L
Linus Torvalds 已提交
2808 2809
	}

2810 2811 2812 2813 2814 2815 2816
	/*
	 * 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 (*idx < ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t)) {
		state |= BMAP_RIGHT_VALID;
		xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx), &right);
L
Linus Torvalds 已提交
2817

2818 2819
		if (isnullstartblock(right.br_startblock))
			state |= BMAP_RIGHT_DELAY;
L
Linus Torvalds 已提交
2820
	}
2821

L
Linus Torvalds 已提交
2822
	/*
2823 2824
	 * Set contiguity flags on the left and right neighbors.
	 * Don't let extents get too large, even if the pieces are contiguous.
L
Linus Torvalds 已提交
2825
	 */
2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837
	if ((state & BMAP_LEFT_VALID) && (state & BMAP_LEFT_DELAY) &&
	    left.br_startoff + left.br_blockcount == new->br_startoff &&
	    left.br_blockcount + new->br_blockcount <= MAXEXTLEN)
		state |= BMAP_LEFT_CONTIG;

	if ((state & BMAP_RIGHT_VALID) && (state & BMAP_RIGHT_DELAY) &&
	    new->br_startoff + new->br_blockcount == right.br_startoff &&
	    new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
	    (!(state & BMAP_LEFT_CONTIG) ||
	     (left.br_blockcount + new->br_blockcount +
	      right.br_blockcount <= MAXEXTLEN)))
		state |= BMAP_RIGHT_CONTIG;
2838 2839

	/*
2840
	 * Switch out based on the contiguity flags.
2841
	 */
2842 2843 2844 2845 2846 2847 2848 2849 2850 2851
	switch (state & (BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG)) {
	case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
		/*
		 * New allocation is contiguous with delayed allocations
		 * on the left and on the right.
		 * Merge all three into a single extent record.
		 */
		--*idx;
		temp = left.br_blockcount + new->br_blockcount +
			right.br_blockcount;
2852

2853 2854 2855 2856 2857 2858 2859 2860 2861
		trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
		xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx), temp);
		oldlen = startblockval(left.br_startblock) +
			startblockval(new->br_startblock) +
			startblockval(right.br_startblock);
		newlen = xfs_bmap_worst_indlen(ip, temp);
		xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, *idx),
			nullstartblock((int)newlen));
		trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
L
Linus Torvalds 已提交
2862

2863 2864
		xfs_iext_remove(ip, *idx + 1, 1, state);
		break;
L
Linus Torvalds 已提交
2865

2866 2867 2868 2869 2870 2871 2872 2873
	case BMAP_LEFT_CONTIG:
		/*
		 * New allocation is contiguous with a delayed allocation
		 * on the left.
		 * Merge the new allocation with the left neighbor.
		 */
		--*idx;
		temp = left.br_blockcount + new->br_blockcount;
L
Linus Torvalds 已提交
2874

2875 2876 2877 2878 2879 2880 2881 2882 2883
		trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
		xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx), temp);
		oldlen = startblockval(left.br_startblock) +
			startblockval(new->br_startblock);
		newlen = xfs_bmap_worst_indlen(ip, temp);
		xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, *idx),
			nullstartblock((int)newlen));
		trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
		break;
L
Linus Torvalds 已提交
2884

2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910
	case BMAP_RIGHT_CONTIG:
		/*
		 * New allocation is contiguous with a delayed allocation
		 * on the right.
		 * Merge the new allocation with the right neighbor.
		 */
		trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
		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(xfs_iext_get_ext(ifp, *idx),
			new->br_startoff,
			nullstartblock((int)newlen), temp, right.br_state);
		trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
		break;

	case 0:
		/*
		 * New allocation is not contiguous with another
		 * delayed allocation.
		 * Insert a new entry.
		 */
		oldlen = newlen = 0;
		xfs_iext_insert(ip, *idx, 1, new, state);
		break;
L
Linus Torvalds 已提交
2911
	}
2912 2913
	if (oldlen != newlen) {
		ASSERT(oldlen > newlen);
2914 2915
		xfs_mod_fdblocks(ip->i_mount, (int64_t)(oldlen - newlen),
				 false);
L
Linus Torvalds 已提交
2916
		/*
2917
		 * Nothing to do for disk quota accounting here.
L
Linus Torvalds 已提交
2918 2919 2920 2921 2922
		 */
	}
}

/*
2923
 * Convert a hole to a real allocation.
L
Linus Torvalds 已提交
2924
 */
2925 2926 2927 2928
STATIC int				/* error */
xfs_bmap_add_extent_hole_real(
	struct xfs_bmalloca	*bma,
	int			whichfork)
2929
{
2930 2931 2932 2933 2934 2935 2936 2937
	struct xfs_bmbt_irec	*new = &bma->got;
	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 */
	int			rval=0;	/* return value (logging flags) */
	int			state;	/* state bits, accessed thru macros */
2938
	struct xfs_mount	*mp;
2939

2940
	mp = bma->tp ? bma->tp->t_mountp : NULL;
2941
	ifp = XFS_IFORK_PTR(bma->ip, whichfork);
2942

2943 2944 2945 2946 2947
	ASSERT(bma->idx >= 0);
	ASSERT(bma->idx <= ifp->if_bytes / sizeof(struct xfs_bmbt_rec));
	ASSERT(!isnullstartblock(new->br_startblock));
	ASSERT(!bma->cur ||
	       !(bma->cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL));
2948

2949
	XFS_STATS_INC(xs_add_exlist);
2950

2951 2952 2953
	state = 0;
	if (whichfork == XFS_ATTR_FORK)
		state |= BMAP_ATTRFORK;
2954

2955 2956 2957 2958 2959 2960 2961 2962 2963
	/*
	 * Check and set flags if this segment has a left neighbor.
	 */
	if (bma->idx > 0) {
		state |= BMAP_LEFT_VALID;
		xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx - 1), &left);
		if (isnullstartblock(left.br_startblock))
			state |= BMAP_LEFT_DELAY;
	}
2964 2965

	/*
2966 2967
	 * Check and set flags if this segment has a current value.
	 * Not true if we're inserting into the "hole" at eof.
2968
	 */
2969 2970 2971 2972 2973 2974
	if (bma->idx < ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)) {
		state |= BMAP_RIGHT_VALID;
		xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx), &right);
		if (isnullstartblock(right.br_startblock))
			state |= BMAP_RIGHT_DELAY;
	}
2975

2976 2977 2978 2979 2980 2981 2982 2983 2984 2985
	/*
	 * We're inserting a real allocation between "left" and "right".
	 * Set the contiguity flags.  Don't let extents get too large.
	 */
	if ((state & BMAP_LEFT_VALID) && !(state & BMAP_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 |= BMAP_LEFT_CONTIG;
2986

2987 2988 2989 2990 2991 2992 2993 2994 2995
	if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_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 & BMAP_LEFT_CONTIG) ||
	     left.br_blockcount + new->br_blockcount +
	     right.br_blockcount <= MAXEXTLEN))
		state |= BMAP_RIGHT_CONTIG;
2996

2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013
	error = 0;
	/*
	 * Select which case we're in here, and implement it.
	 */
	switch (state & (BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG)) {
	case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
		/*
		 * New allocation is contiguous with real allocations on the
		 * left and on the right.
		 * Merge all three into a single extent record.
		 */
		--bma->idx;
		trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
		xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx),
			left.br_blockcount + new->br_blockcount +
			right.br_blockcount);
		trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
3014

3015
		xfs_iext_remove(bma->ip, bma->idx + 1, 1, state);
3016

3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027
		XFS_IFORK_NEXT_SET(bma->ip, whichfork,
			XFS_IFORK_NEXTENTS(bma->ip, whichfork) - 1);
		if (bma->cur == NULL) {
			rval = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
		} else {
			rval = XFS_ILOG_CORE;
			error = xfs_bmbt_lookup_eq(bma->cur, right.br_startoff,
					right.br_startblock, right.br_blockcount,
					&i);
			if (error)
				goto done;
3028
			XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
3029 3030 3031
			error = xfs_btree_delete(bma->cur, &i);
			if (error)
				goto done;
3032
			XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
3033 3034 3035
			error = xfs_btree_decrement(bma->cur, 0, &i);
			if (error)
				goto done;
3036
			XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
3037 3038 3039 3040 3041 3042 3043 3044 3045 3046
			error = xfs_bmbt_update(bma->cur, left.br_startoff,
					left.br_startblock,
					left.br_blockcount +
						new->br_blockcount +
						right.br_blockcount,
					left.br_state);
			if (error)
				goto done;
		}
		break;
3047

3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058
	case BMAP_LEFT_CONTIG:
		/*
		 * New allocation is contiguous with a real allocation
		 * on the left.
		 * Merge the new allocation with the left neighbor.
		 */
		--bma->idx;
		trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
		xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx),
			left.br_blockcount + new->br_blockcount);
		trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
L
Linus Torvalds 已提交
3059

3060 3061 3062 3063 3064 3065 3066 3067 3068
		if (bma->cur == NULL) {
			rval = xfs_ilog_fext(whichfork);
		} else {
			rval = 0;
			error = xfs_bmbt_lookup_eq(bma->cur, left.br_startoff,
					left.br_startblock, left.br_blockcount,
					&i);
			if (error)
				goto done;
3069
			XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
3070 3071 3072 3073 3074 3075 3076 3077 3078
			error = xfs_bmbt_update(bma->cur, left.br_startoff,
					left.br_startblock,
					left.br_blockcount +
						new->br_blockcount,
					left.br_state);
			if (error)
				goto done;
		}
		break;
3079

3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091
	case BMAP_RIGHT_CONTIG:
		/*
		 * New allocation is contiguous with a real allocation
		 * on the right.
		 * Merge the new allocation with the right neighbor.
		 */
		trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
		xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, bma->idx),
			new->br_startoff, new->br_startblock,
			new->br_blockcount + right.br_blockcount,
			right.br_state);
		trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
3092

3093 3094 3095 3096 3097 3098 3099 3100 3101 3102
		if (bma->cur == NULL) {
			rval = xfs_ilog_fext(whichfork);
		} else {
			rval = 0;
			error = xfs_bmbt_lookup_eq(bma->cur,
					right.br_startoff,
					right.br_startblock,
					right.br_blockcount, &i);
			if (error)
				goto done;
3103
			XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
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
			error = xfs_bmbt_update(bma->cur, new->br_startoff,
					new->br_startblock,
					new->br_blockcount +
						right.br_blockcount,
					right.br_state);
			if (error)
				goto done;
		}
		break;

	case 0:
		/*
		 * New allocation is not contiguous with another
		 * real allocation.
		 * Insert a new entry.
		 */
		xfs_iext_insert(bma->ip, bma->idx, 1, new, state);
		XFS_IFORK_NEXT_SET(bma->ip, whichfork,
			XFS_IFORK_NEXTENTS(bma->ip, whichfork) + 1);
		if (bma->cur == NULL) {
			rval = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
		} else {
			rval = XFS_ILOG_CORE;
			error = xfs_bmbt_lookup_eq(bma->cur,
					new->br_startoff,
					new->br_startblock,
					new->br_blockcount, &i);
			if (error)
				goto done;
3133
			XFS_WANT_CORRUPTED_GOTO(mp, i == 0, done);
3134 3135 3136 3137
			bma->cur->bc_rec.b.br_state = new->br_state;
			error = xfs_btree_insert(bma->cur, &i);
			if (error)
				goto done;
3138
			XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163
		}
		break;
	}

	/* convert to a btree if necessary */
	if (xfs_bmap_needs_btree(bma->ip, whichfork)) {
		int	tmp_logflags;	/* partial log flag return val */

		ASSERT(bma->cur == NULL);
		error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
				bma->firstblock, bma->flist, &bma->cur,
				0, &tmp_logflags, whichfork);
		bma->logflags |= tmp_logflags;
		if (error)
			goto done;
	}

	/* clear out the allocated field, done with it now in any case. */
	if (bma->cur)
		bma->cur->bc_private.b.allocated = 0;

	xfs_bmap_check_leaf_extents(bma->cur, bma->ip, whichfork);
done:
	bma->logflags |= rval;
	return error;
L
Linus Torvalds 已提交
3164 3165 3166
}

/*
3167
 * Functions used in the extent read, allocate and remove paths
L
Linus Torvalds 已提交
3168 3169
 */

3170 3171 3172
/*
 * Adjust the size of the new extent based on di_extsize and rt extsize.
 */
D
Dave Chinner 已提交
3173
int
3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184
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 */
3185
{
3186 3187 3188 3189 3190 3191 3192 3193
	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 */
3194

3195
	if (convert)
3196 3197
		return 0;

3198 3199 3200
	orig_off = align_off = *offp;
	orig_alen = align_alen = *lenp;
	orig_end = orig_off + orig_alen;
L
Linus Torvalds 已提交
3201 3202

	/*
3203 3204
	 * If this request overlaps an existing extent, then don't
	 * attempt to perform any additional alignment.
L
Linus Torvalds 已提交
3205
	 */
3206 3207 3208 3209 3210 3211
	if (!delay && !eof &&
	    (orig_off >= gotp->br_startoff) &&
	    (orig_end <= gotp->br_startoff + gotp->br_blockcount)) {
		return 0;
	}

L
Linus Torvalds 已提交
3212
	/*
3213 3214 3215 3216 3217
	 * 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.
L
Linus Torvalds 已提交
3218
	 */
3219 3220 3221 3222
	temp = do_mod(orig_off, extsz);
	if (temp) {
		align_alen += temp;
		align_off -= temp;
L
Linus Torvalds 已提交
3223
	}
3224 3225 3226 3227 3228 3229

	/* Same adjustment for the end of the requested area. */
	temp = (align_alen % extsz);
	if (temp)
		align_alen += extsz - temp;

L
Linus Torvalds 已提交
3230
	/*
3231 3232 3233 3234 3235 3236
	 * For large extent hint sizes, the aligned extent might be larger than
	 * MAXEXTLEN. In that case, reduce the size by an extsz so that it pulls
	 * the length back under MAXEXTLEN. The outer allocation loops handle
	 * short allocation just fine, so it is safe to do this. We only want to
	 * do it when we are forced to, though, because it means more allocation
	 * operations are required.
L
Linus Torvalds 已提交
3237
	 */
3238 3239 3240 3241
	while (align_alen > MAXEXTLEN)
		align_alen -= extsz;
	ASSERT(align_alen <= MAXEXTLEN);

L
Linus Torvalds 已提交
3242
	/*
3243 3244
	 * If the previous block overlaps with this proposed allocation
	 * then move the start forward without adjusting the length.
L
Linus Torvalds 已提交
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
	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;
	}
L
Linus Torvalds 已提交
3289

3290 3291 3292 3293 3294
	/*
	 * 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))) {
L
Linus Torvalds 已提交
3295
		/*
3296 3297
		 * We're not covering the original request, or
		 * we won't be able to once we fix the length.
L
Linus Torvalds 已提交
3298
		 */
3299 3300 3301
		if (orig_off < align_off ||
		    orig_end > align_off + align_alen ||
		    align_alen - temp < orig_alen)
D
Dave Chinner 已提交
3302
			return -EINVAL;
L
Linus Torvalds 已提交
3303
		/*
3304
		 * Try to fix it by moving the start up.
L
Linus Torvalds 已提交
3305
		 */
3306 3307 3308
		if (align_off + temp <= orig_off) {
			align_alen -= temp;
			align_off += temp;
L
Linus Torvalds 已提交
3309
		}
3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321
		/*
		 * 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;
L
Linus Torvalds 已提交
3322 3323
		}
		/*
3324
		 * Result doesn't cover the request, fail it.
L
Linus Torvalds 已提交
3325
		 */
3326
		if (orig_off < align_off || orig_end > align_off + align_alen)
D
Dave Chinner 已提交
3327
			return -EINVAL;
3328 3329
	} else {
		ASSERT(orig_off >= align_off);
3330 3331 3332
		/* see MAXEXTLEN handling above */
		ASSERT(orig_end <= align_off + align_alen ||
		       align_alen + extsz > MAXEXTLEN);
L
Linus Torvalds 已提交
3333 3334
	}

C
Christoph Hellwig 已提交
3335
#ifdef DEBUG
3336 3337 3338 3339 3340
	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
L
Linus Torvalds 已提交
3341

3342 3343 3344
	*lenp = align_alen;
	*offp = align_off;
	return 0;
L
Linus Torvalds 已提交
3345 3346
}

3347 3348
#define XFS_ALLOC_GAP_UNITS	4

D
Dave Chinner 已提交
3349
void
3350
xfs_bmap_adjacent(
D
Dave Chinner 已提交
3351
	struct xfs_bmalloca	*ap)	/* bmap alloc argument struct */
L
Linus Torvalds 已提交
3352
{
3353 3354 3355 3356 3357
	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 */
L
Linus Torvalds 已提交
3358

3359 3360 3361 3362 3363 3364
#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)
L
Linus Torvalds 已提交
3365

3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434
	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 its last block as our starting point.
	 */
	if (ap->eof && ap->prev.br_startoff != NULLFILEOFF &&
	    !isnullstartblock(ap->prev.br_startblock) &&
	    ISVALID(ap->prev.br_startblock + ap->prev.br_blockcount,
		    ap->prev.br_startblock)) {
		ap->blkno = ap->prev.br_startblock + ap->prev.br_blockcount;
		/*
		 * Adjust for the gap between prevp and us.
		 */
		adjust = ap->offset -
			(ap->prev.br_startoff + ap->prev.br_blockcount);
		if (adjust &&
		    ISVALID(ap->blkno + adjust, ap->prev.br_startblock))
			ap->blkno += 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->prev.br_startoff != NULLFILEOFF &&
		    !isnullstartblock(ap->prev.br_startblock) &&
		    (prevbno = ap->prev.br_startblock +
			       ap->prev.br_blockcount) &&
		    ISVALID(prevbno, ap->prev.br_startblock)) {
			/*
			 * Calculate gap to end of previous block.
			 */
			adjust = prevdiff = ap->offset -
				(ap->prev.br_startoff +
				 ap->prev.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->length &&
			    ISVALID(prevbno + prevdiff,
				    ap->prev.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;
L
Linus Torvalds 已提交
3435
		}
3436 3437 3438 3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 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 3486 3487 3488 3489 3490 3491 3492
		/*
		 * 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->got.br_startblock)) {
			/*
			 * Calculate gap to start of next block.
			 */
			adjust = gotdiff = ap->got.br_startoff - ap->offset;
			/*
			 * Figure the startblock based on the next block's
			 * start and the gap size.
			 */
			gotbno = ap->got.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->length &&
			    ISVALID(gotbno - gotdiff, gotbno))
				gotbno -= adjust;
			else if (ISVALID(gotbno - ap->length, gotbno)) {
				gotbno -= ap->length;
				gotdiff += adjust - ap->length;
			} 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->blkno is already set (to 0 or the inode block).
		 */
		if (prevbno != NULLFSBLOCK && gotbno != NULLFSBLOCK)
			ap->blkno = prevdiff <= gotdiff ? prevbno : gotbno;
		else if (prevbno != NULLFSBLOCK)
			ap->blkno = prevbno;
		else if (gotbno != NULLFSBLOCK)
			ap->blkno = gotbno;
L
Linus Torvalds 已提交
3493
	}
3494
#undef ISVALID
L
Linus Torvalds 已提交
3495 3496
}

3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519 3520
static int
xfs_bmap_longest_free_extent(
	struct xfs_trans	*tp,
	xfs_agnumber_t		ag,
	xfs_extlen_t		*blen,
	int			*notinit)
{
	struct xfs_mount	*mp = tp->t_mountp;
	struct xfs_perag	*pag;
	xfs_extlen_t		longest;
	int			error = 0;

	pag = xfs_perag_get(mp, ag);
	if (!pag->pagf_init) {
		error = xfs_alloc_pagf_init(mp, tp, ag, XFS_ALLOC_FLAG_TRYLOCK);
		if (error)
			goto out;

		if (!pag->pagf_init) {
			*notinit = 1;
			goto out;
		}
	}

3521
	longest = xfs_alloc_longest_free_extent(mp, pag,
3522
					xfs_alloc_min_freelist(mp, pag));
3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558
	if (*blen < longest)
		*blen = longest;

out:
	xfs_perag_put(pag);
	return error;
}

static void
xfs_bmap_select_minlen(
	struct xfs_bmalloca	*ap,
	struct xfs_alloc_arg	*args,
	xfs_extlen_t		*blen,
	int			notinit)
{
	if (notinit || *blen < ap->minlen) {
		/*
		 * Since we did a BUF_TRYLOCK above, it is possible that
		 * there is space for this request.
		 */
		args->minlen = ap->minlen;
	} else if (*blen < args->maxlen) {
		/*
		 * If the best seen length is less than the request length,
		 * use the best as the minimum.
		 */
		args->minlen = *blen;
	} else {
		/*
		 * Otherwise we've seen an extent as big as maxlen, use that
		 * as the minimum.
		 */
		args->minlen = args->maxlen;
	}
}

3559
STATIC int
3560 3561 3562 3563
xfs_bmap_btalloc_nullfb(
	struct xfs_bmalloca	*ap,
	struct xfs_alloc_arg	*args,
	xfs_extlen_t		*blen)
3564
{
3565 3566 3567
	struct xfs_mount	*mp = ap->ip->i_mount;
	xfs_agnumber_t		ag, startag;
	int			notinit = 0;
3568 3569
	int			error;

3570
	args->type = XFS_ALLOCTYPE_START_BNO;
3571
	args->total = ap->total;
3572

3573 3574 3575
	startag = ag = XFS_FSB_TO_AGNO(mp, args->fsbno);
	if (startag == NULLAGNUMBER)
		startag = ag = 0;
3576

3577
	while (*blen < args->maxlen) {
3578 3579 3580 3581
		error = xfs_bmap_longest_free_extent(args->tp, ag, blen,
						     &notinit);
		if (error)
			return error;
3582

3583 3584 3585 3586 3587
		if (++ag == mp->m_sb.sb_agcount)
			ag = 0;
		if (ag == startag)
			break;
	}
3588

3589 3590 3591 3592 3593 3594 3595 3596 3597 3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 3611 3612 3613 3614 3615 3616 3617 3618 3619 3620 3621 3622 3623 3624 3625 3626 3627
	xfs_bmap_select_minlen(ap, args, blen, notinit);
	return 0;
}

STATIC int
xfs_bmap_btalloc_filestreams(
	struct xfs_bmalloca	*ap,
	struct xfs_alloc_arg	*args,
	xfs_extlen_t		*blen)
{
	struct xfs_mount	*mp = ap->ip->i_mount;
	xfs_agnumber_t		ag;
	int			notinit = 0;
	int			error;

	args->type = XFS_ALLOCTYPE_NEAR_BNO;
	args->total = ap->total;

	ag = XFS_FSB_TO_AGNO(mp, args->fsbno);
	if (ag == NULLAGNUMBER)
		ag = 0;

	error = xfs_bmap_longest_free_extent(args->tp, ag, blen, &notinit);
	if (error)
		return error;

	if (*blen < args->maxlen) {
		error = xfs_filestream_new_ag(ap, &ag);
		if (error)
			return error;

		error = xfs_bmap_longest_free_extent(args->tp, ag, blen,
						     &notinit);
		if (error)
			return error;

	}

	xfs_bmap_select_minlen(ap, args, blen, notinit);
3628 3629

	/*
3630 3631
	 * Set the failure fallback case to look in the selected AG as stream
	 * may have moved.
3632
	 */
3633
	ap->blkno = args->fsbno = XFS_AGB_TO_FSB(mp, ag, 0);
3634 3635 3636
	return 0;
}

3637 3638
STATIC int
xfs_bmap_btalloc(
D
Dave Chinner 已提交
3639
	struct xfs_bmalloca	*ap)	/* bmap alloc argument struct */
3640
{
3641 3642 3643 3644 3645 3646 3647 3648 3649 3650 3651 3652
	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	fb_agno;	/* ag number of ap->firstblock */
	xfs_agnumber_t	ag;
	xfs_alloc_arg_t	args;
	xfs_extlen_t	blen;
	xfs_extlen_t	nextminlen = 0;
	int		nullfb;		/* true if ap->firstblock isn't set */
	int		isaligned;
	int		tryagain;
	int		error;
3653
	int		stripe_align;
3654

3655
	ASSERT(ap->length);
3656

3657
	mp = ap->ip->i_mount;
3658 3659 3660 3661 3662 3663 3664 3665

	/* stripe alignment for allocation is determined by mount parameters */
	stripe_align = 0;
	if (mp->m_swidth && (mp->m_flags & XFS_MOUNT_SWALLOC))
		stripe_align = mp->m_swidth;
	else if (mp->m_dalign)
		stripe_align = mp->m_dalign;

3666 3667 3668 3669 3670 3671 3672
	align = ap->userdata ? xfs_get_extsz_hint(ap->ip) : 0;
	if (unlikely(align)) {
		error = xfs_bmap_extsize_align(mp, &ap->got, &ap->prev,
						align, 0, ap->eof, 0, ap->conv,
						&ap->offset, &ap->length);
		ASSERT(!error);
		ASSERT(ap->length);
3673
	}
3674 3675


3676 3677 3678 3679 3680 3681 3682 3683 3684 3685 3686 3687
	nullfb = *ap->firstblock == NULLFSBLOCK;
	fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp, *ap->firstblock);
	if (nullfb) {
		if (ap->userdata && xfs_inode_is_filestream(ap->ip)) {
			ag = xfs_filestream_lookup_ag(ap->ip);
			ag = (ag != NULLAGNUMBER) ? ag : 0;
			ap->blkno = XFS_AGB_TO_FSB(mp, ag, 0);
		} else {
			ap->blkno = XFS_INO_TO_FSB(mp, ap->ip->i_ino);
		}
	} else
		ap->blkno = *ap->firstblock;
3688

3689
	xfs_bmap_adjacent(ap);
3690

3691 3692 3693 3694 3695 3696 3697 3698 3699 3700 3701 3702 3703 3704 3705 3706
	/*
	 * If allowed, use ap->blkno; otherwise must use firstblock since
	 * it's in the right allocation group.
	 */
	if (nullfb || XFS_FSB_TO_AGNO(mp, ap->blkno) == fb_agno)
		;
	else
		ap->blkno = *ap->firstblock;
	/*
	 * Normal allocation, done through xfs_alloc_vextent.
	 */
	tryagain = isaligned = 0;
	memset(&args, 0, sizeof(args));
	args.tp = ap->tp;
	args.mp = mp;
	args.fsbno = ap->blkno;
3707

3708 3709 3710 3711 3712
	/* Trim the allocation back to the maximum an AG can fit. */
	args.maxlen = MIN(ap->length, XFS_ALLOC_AG_MAX_USABLE(mp));
	args.firstblock = *ap->firstblock;
	blen = 0;
	if (nullfb) {
3713 3714 3715 3716 3717 3718 3719 3720 3721
		/*
		 * 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.
		 */
		if (ap->userdata && xfs_inode_is_filestream(ap->ip))
			error = xfs_bmap_btalloc_filestreams(ap, &args, &blen);
		else
			error = xfs_bmap_btalloc_nullfb(ap, &args, &blen);
3722 3723
		if (error)
			return error;
3724 3725 3726 3727 3728 3729 3730 3731 3732 3733
	} else if (ap->flist->xbf_low) {
		if (xfs_inode_is_filestream(ap->ip))
			args.type = XFS_ALLOCTYPE_FIRST_AG;
		else
			args.type = XFS_ALLOCTYPE_START_BNO;
		args.total = args.minlen = ap->minlen;
	} else {
		args.type = XFS_ALLOCTYPE_NEAR_BNO;
		args.total = ap->total;
		args.minlen = ap->minlen;
3734
	}
3735 3736 3737 3738 3739 3740 3741 3742 3743 3744 3745 3746
	/* apply extent size hints if obtained earlier */
	if (unlikely(align)) {
		args.prod = align;
		if ((args.mod = (xfs_extlen_t)do_mod(ap->offset, args.prod)))
			args.mod = (xfs_extlen_t)(args.prod - args.mod);
	} else if (mp->m_sb.sb_blocksize >= PAGE_CACHE_SIZE) {
		args.prod = 1;
		args.mod = 0;
	} else {
		args.prod = PAGE_CACHE_SIZE >> mp->m_sb.sb_blocklog;
		if ((args.mod = (xfs_extlen_t)(do_mod(ap->offset, args.prod))))
			args.mod = (xfs_extlen_t)(args.prod - args.mod);
3747
	}
3748
	/*
3749 3750 3751 3752 3753 3754 3755
	 * 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.
3756
	 */
3757 3758
	if (!ap->flist->xbf_low && ap->aeof) {
		if (!ap->offset) {
3759
			args.alignment = stripe_align;
3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778 3779 3780 3781 3782 3783
			atype = args.type;
			isaligned = 1;
			/*
			 * Adjust for alignment
			 */
			if (blen > args.alignment && blen <= args.maxlen)
				args.minlen = blen - args.alignment;
			args.minalignslop = 0;
		} else {
			/*
			 * First try an exact bno allocation.
			 * If it fails then do a near or start bno
			 * allocation with alignment turned on.
			 */
			atype = args.type;
			tryagain = 1;
			args.type = XFS_ALLOCTYPE_THIS_BNO;
			args.alignment = 1;
			/*
			 * 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.
			 */
3784 3785
			if (blen > stripe_align && blen <= args.maxlen)
				nextminlen = blen - stripe_align;
3786 3787
			else
				nextminlen = args.minlen;
3788
			if (nextminlen + stripe_align > args.minlen + 1)
3789
				args.minalignslop =
3790
					nextminlen + stripe_align -
3791 3792 3793
					args.minlen - 1;
			else
				args.minalignslop = 0;
3794 3795
		}
	} else {
3796 3797
		args.alignment = 1;
		args.minalignslop = 0;
3798
	}
3799 3800 3801 3802
	args.minleft = ap->minleft;
	args.wasdel = ap->wasdel;
	args.isfl = 0;
	args.userdata = ap->userdata;
3803 3804 3805 3806 3807
	if (ap->userdata & XFS_ALLOC_USERDATA_ZERO)
		args.ip = ap->ip;

	error = xfs_alloc_vextent(&args);
	if (error)
3808
		return error;
3809

3810 3811 3812 3813 3814 3815 3816
	if (tryagain && args.fsbno == NULLFSBLOCK) {
		/*
		 * Exact allocation failed. Now try with alignment
		 * turned on.
		 */
		args.type = atype;
		args.fsbno = ap->blkno;
3817
		args.alignment = stripe_align;
3818 3819 3820 3821 3822
		args.minlen = nextminlen;
		args.minalignslop = 0;
		isaligned = 1;
		if ((error = xfs_alloc_vextent(&args)))
			return error;
3823
	}
3824 3825 3826 3827 3828 3829 3830 3831 3832
	if (isaligned && args.fsbno == NULLFSBLOCK) {
		/*
		 * allocation failed, so turn off alignment and
		 * try again.
		 */
		args.type = atype;
		args.fsbno = ap->blkno;
		args.alignment = 0;
		if ((error = xfs_alloc_vextent(&args)))
3833 3834
			return error;
	}
3835 3836 3837 3838 3839 3840 3841
	if (args.fsbno == NULLFSBLOCK && nullfb &&
	    args.minlen > ap->minlen) {
		args.minlen = ap->minlen;
		args.type = XFS_ALLOCTYPE_START_BNO;
		args.fsbno = ap->blkno;
		if ((error = xfs_alloc_vextent(&args)))
			return error;
3842
	}
3843 3844 3845 3846 3847 3848 3849 3850 3851 3852 3853 3854 3855 3856 3857 3858 3859 3860 3861 3862
	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->flist->xbf_low = 1;
	}
	if (args.fsbno != NULLFSBLOCK) {
		/*
		 * check the allocation happened at the same or higher AG than
		 * the first block that was allocated.
		 */
		ASSERT(*ap->firstblock == NULLFSBLOCK ||
		       XFS_FSB_TO_AGNO(mp, *ap->firstblock) ==
		       XFS_FSB_TO_AGNO(mp, args.fsbno) ||
		       (ap->flist->xbf_low &&
			XFS_FSB_TO_AGNO(mp, *ap->firstblock) <
			XFS_FSB_TO_AGNO(mp, args.fsbno)));
3863

3864 3865 3866 3867 3868 3869 3870 3871 3872 3873 3874 3875 3876 3877 3878 3879 3880 3881 3882 3883 3884 3885 3886 3887
		ap->blkno = args.fsbno;
		if (*ap->firstblock == NULLFSBLOCK)
			*ap->firstblock = args.fsbno;
		ASSERT(nullfb || fb_agno == args.agno ||
		       (ap->flist->xbf_low && fb_agno < args.agno));
		ap->length = 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(ap->tp, ap->ip,
			ap->wasdel ? XFS_TRANS_DQ_DELBCOUNT :
					XFS_TRANS_DQ_BCOUNT,
			(long) args.len);
	} else {
		ap->blkno = NULLFSBLOCK;
		ap->length = 0;
	}
	return 0;
}
3888

3889 3890 3891 3892 3893 3894
/*
 * 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(
D
Dave Chinner 已提交
3895
	struct xfs_bmalloca	*ap)	/* bmap alloc argument struct */
3896 3897 3898 3899 3900
{
	if (XFS_IS_REALTIME_INODE(ap->ip) && ap->userdata)
		return xfs_bmap_rtalloc(ap);
	return xfs_bmap_btalloc(ap);
}
3901

3902 3903 3904 3905 3906 3907 3908 3909 3910 3911 3912 3913 3914 3915 3916 3917 3918 3919 3920 3921 3922
/*
 * Trim the returned map to the required bounds
 */
STATIC void
xfs_bmapi_trim_map(
	struct xfs_bmbt_irec	*mval,
	struct xfs_bmbt_irec	*got,
	xfs_fileoff_t		*bno,
	xfs_filblks_t		len,
	xfs_fileoff_t		obno,
	xfs_fileoff_t		end,
	int			n,
	int			flags)
{
	if ((flags & XFS_BMAPI_ENTIRE) ||
	    got->br_startoff + got->br_blockcount <= obno) {
		*mval = *got;
		if (isnullstartblock(got->br_startblock))
			mval->br_startblock = DELAYSTARTBLOCK;
		return;
	}
3923

3924 3925 3926 3927 3928 3929 3930 3931 3932 3933
	if (obno > *bno)
		*bno = obno;
	ASSERT((*bno >= obno) || (n == 0));
	ASSERT(*bno < end);
	mval->br_startoff = *bno;
	if (isnullstartblock(got->br_startblock))
		mval->br_startblock = DELAYSTARTBLOCK;
	else
		mval->br_startblock = got->br_startblock +
					(*bno - got->br_startoff);
3934
	/*
3935 3936 3937 3938 3939
	 * 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.
3940
	 */
3941 3942 3943 3944 3945
	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);
	return;
3946 3947
}

3948 3949 3950 3951 3952 3953 3954 3955 3956 3957 3958 3959
/*
 * Update and validate the extent map to return
 */
STATIC void
xfs_bmapi_update_map(
	struct xfs_bmbt_irec	**map,
	xfs_fileoff_t		*bno,
	xfs_filblks_t		*len,
	xfs_fileoff_t		obno,
	xfs_fileoff_t		end,
	int			*n,
	int			flags)
3960
{
3961
	xfs_bmbt_irec_t	*mval = *map;
3962

3963 3964 3965 3966
	ASSERT((flags & XFS_BMAPI_ENTIRE) ||
	       ((mval->br_startoff + mval->br_blockcount) <= end));
	ASSERT((flags & XFS_BMAPI_ENTIRE) || (mval->br_blockcount <= *len) ||
	       (mval->br_startoff < obno));
3967

3968 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
	*bno = mval->br_startoff + mval->br_blockcount;
	*len = end - *bno;
	if (*n > 0 && mval->br_startoff == mval[-1].br_startoff) {
		/* update previous map with new information */
		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 &&
		   ((flags & XFS_BMAPI_IGSTATE) ||
			mval[-1].br_state == mval->br_state)) {
		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)++;
	}
	*map = mval;
4001 4002 4003
}

/*
4004
 * Map file blocks to filesystem blocks without allocation.
4005 4006
 */
int
4007 4008 4009
xfs_bmapi_read(
	struct xfs_inode	*ip,
	xfs_fileoff_t		bno,
4010
	xfs_filblks_t		len,
4011 4012
	struct xfs_bmbt_irec	*mval,
	int			*nmap,
4013
	int			flags)
4014
{
4015 4016 4017 4018 4019 4020 4021 4022 4023 4024
	struct xfs_mount	*mp = ip->i_mount;
	struct xfs_ifork	*ifp;
	struct xfs_bmbt_irec	got;
	struct xfs_bmbt_irec	prev;
	xfs_fileoff_t		obno;
	xfs_fileoff_t		end;
	xfs_extnum_t		lastx;
	int			error;
	int			eof;
	int			n = 0;
4025 4026 4027
	int			whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
						XFS_ATTR_FORK : XFS_DATA_FORK;

4028 4029 4030
	ASSERT(*nmap >= 1);
	ASSERT(!(flags & ~(XFS_BMAPI_ATTRFORK|XFS_BMAPI_ENTIRE|
			   XFS_BMAPI_IGSTATE)));
4031
	ASSERT(xfs_isilocked(ip, XFS_ILOCK_SHARED|XFS_ILOCK_EXCL));
4032

4033 4034 4035 4036 4037
	if (unlikely(XFS_TEST_ERROR(
	    (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
	     XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE),
	     mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) {
		XFS_ERROR_REPORT("xfs_bmapi_read", XFS_ERRLEVEL_LOW, mp);
D
Dave Chinner 已提交
4038
		return -EFSCORRUPTED;
4039
	}
4040

4041
	if (XFS_FORCED_SHUTDOWN(mp))
D
Dave Chinner 已提交
4042
		return -EIO;
4043 4044 4045 4046 4047 4048 4049 4050 4051

	XFS_STATS_INC(xs_blk_mapr);

	ifp = XFS_IFORK_PTR(ip, whichfork);

	if (!(ifp->if_flags & XFS_IFEXTENTS)) {
		error = xfs_iread_extents(NULL, ip, whichfork);
		if (error)
			return error;
4052 4053
	}

4054 4055 4056
	xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got, &prev);
	end = bno + len;
	obno = bno;
4057

4058 4059 4060 4061 4062 4063 4064 4065 4066 4067 4068 4069 4070 4071 4072 4073 4074
	while (bno < end && n < *nmap) {
		/* Reading past eof, act as though there's a hole up to end. */
		if (eof)
			got.br_startoff = end;
		if (got.br_startoff > bno) {
			/* 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;
		}
4075

4076 4077 4078 4079 4080 4081 4082 4083 4084 4085 4086 4087 4088 4089 4090
		/* set up the extent map to return. */
		xfs_bmapi_trim_map(mval, &got, &bno, len, obno, end, n, flags);
		xfs_bmapi_update_map(&mval, &bno, &len, obno, end, &n, flags);

		/* If we're done, stop now. */
		if (bno >= end || n >= *nmap)
			break;

		/* Else go on to the next record. */
		if (++lastx < ifp->if_bytes / sizeof(xfs_bmbt_rec_t))
			xfs_bmbt_get_all(xfs_iext_get_ext(ifp, lastx), &got);
		else
			eof = 1;
	}
	*nmap = n;
4091 4092 4093
	return 0;
}

4094 4095 4096 4097 4098 4099 4100 4101 4102
STATIC int
xfs_bmapi_reserve_delalloc(
	struct xfs_inode	*ip,
	xfs_fileoff_t		aoff,
	xfs_filblks_t		len,
	struct xfs_bmbt_irec	*got,
	struct xfs_bmbt_irec	*prev,
	xfs_extnum_t		*lastx,
	int			eof)
L
Linus Torvalds 已提交
4103
{
4104
	struct xfs_mount	*mp = ip->i_mount;
4105 4106 4107 4108 4109 4110
	struct xfs_ifork	*ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
	xfs_extlen_t		alen;
	xfs_extlen_t		indlen;
	char			rt = XFS_IS_REALTIME_INODE(ip);
	xfs_extlen_t		extsz;
	int			error;
4111

4112 4113 4114
	alen = XFS_FILBLKS_MIN(len, MAXEXTLEN);
	if (!eof)
		alen = XFS_FILBLKS_MIN(alen, got->br_startoff - aoff);
L
Linus Torvalds 已提交
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
	/* Figure out the extent size, adjust alen */
	extsz = xfs_get_extsz_hint(ip);
	if (extsz) {
		error = xfs_bmap_extsize_align(mp, got, prev, extsz, rt, eof,
					       1, 0, &aoff, &alen);
		ASSERT(!error);
	}

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

	/*
	 * Make a transaction-less quota reservation for delayed allocation
	 * blocks.  This number gets adjusted later.  We return if we haven't
	 * allocated blocks already inside this loop.
	 */
	error = xfs_trans_reserve_quota_nblks(NULL, ip, (long)alen, 0,
			rt ? XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS);
	if (error)
		return error;

	/*
	 * Split changing sb for alen and indlen since they could be coming
	 * from different places.
	 */
	indlen = (xfs_extlen_t)xfs_bmap_worst_indlen(ip, alen);
	ASSERT(indlen > 0);

	if (rt) {
D
Dave Chinner 已提交
4145
		error = xfs_mod_frextents(mp, -((int64_t)extsz));
4146
	} else {
4147
		error = xfs_mod_fdblocks(mp, -((int64_t)alen), false);
4148 4149 4150 4151 4152
	}

	if (error)
		goto out_unreserve_quota;

4153
	error = xfs_mod_fdblocks(mp, -((int64_t)indlen), false);
4154 4155 4156 4157 4158 4159 4160 4161 4162 4163 4164 4165 4166 4167 4168 4169 4170 4171 4172 4173 4174 4175 4176 4177 4178 4179
	if (error)
		goto out_unreserve_blocks;


	ip->i_delayed_blks += alen;

	got->br_startoff = aoff;
	got->br_startblock = nullstartblock(indlen);
	got->br_blockcount = alen;
	got->br_state = XFS_EXT_NORM;
	xfs_bmap_add_extent_hole_delay(ip, lastx, got);

	/*
	 * Update our extent pointer, given that xfs_bmap_add_extent_hole_delay
	 * might have merged it into one of the neighbouring ones.
	 */
	xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *lastx), got);

	ASSERT(got->br_startoff <= aoff);
	ASSERT(got->br_startoff + got->br_blockcount >= aoff + alen);
	ASSERT(isnullstartblock(got->br_startblock));
	ASSERT(got->br_state == XFS_EXT_NORM);
	return 0;

out_unreserve_blocks:
	if (rt)
D
Dave Chinner 已提交
4180
		xfs_mod_frextents(mp, extsz);
4181
	else
4182
		xfs_mod_fdblocks(mp, alen, false);
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 4208 4209 4210 4211
out_unreserve_quota:
	if (XFS_IS_QUOTA_ON(mp))
		xfs_trans_unreserve_quota_nblks(NULL, ip, (long)alen, 0, rt ?
				XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS);
	return error;
}

/*
 * Map file blocks to filesystem blocks, adding delayed allocations as needed.
 */
int
xfs_bmapi_delay(
	struct xfs_inode	*ip,	/* incore inode */
	xfs_fileoff_t		bno,	/* starting file offs. mapped */
	xfs_filblks_t		len,	/* length to map in file */
	struct xfs_bmbt_irec	*mval,	/* output: map values */
	int			*nmap,	/* i/o: mval size/count */
	int			flags)	/* XFS_BMAPI_... */
{
	struct xfs_mount	*mp = ip->i_mount;
	struct xfs_ifork	*ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
	struct xfs_bmbt_irec	got;	/* current file extent record */
	struct xfs_bmbt_irec	prev;	/* previous file extent record */
	xfs_fileoff_t		obno;	/* old block number (offset) */
	xfs_fileoff_t		end;	/* end of mapped file region */
	xfs_extnum_t		lastx;	/* last useful extent number */
	int			eof;	/* we've hit the end of extents */
	int			n = 0;	/* current extent index */
	int			error = 0;
4212

L
Linus Torvalds 已提交
4213
	ASSERT(*nmap >= 1);
4214
	ASSERT(*nmap <= XFS_BMAP_MAX_NMAP);
4215
	ASSERT(!(flags & ~XFS_BMAPI_ENTIRE));
4216
	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
4217

L
Linus Torvalds 已提交
4218
	if (unlikely(XFS_TEST_ERROR(
4219 4220
	    (XFS_IFORK_FORMAT(ip, XFS_DATA_FORK) != XFS_DINODE_FMT_EXTENTS &&
	     XFS_IFORK_FORMAT(ip, XFS_DATA_FORK) != XFS_DINODE_FMT_BTREE),
L
Linus Torvalds 已提交
4221
	     mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) {
4222
		XFS_ERROR_REPORT("xfs_bmapi_delay", XFS_ERRLEVEL_LOW, mp);
D
Dave Chinner 已提交
4223
		return -EFSCORRUPTED;
L
Linus Torvalds 已提交
4224
	}
4225

L
Linus Torvalds 已提交
4226
	if (XFS_FORCED_SHUTDOWN(mp))
D
Dave Chinner 已提交
4227
		return -EIO;
4228 4229 4230 4231

	XFS_STATS_INC(xs_blk_mapw);

	if (!(ifp->if_flags & XFS_IFEXTENTS)) {
4232
		error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK);
4233
		if (error)
4234
			return error;
4235 4236
	}

4237
	xfs_bmap_search_extents(ip, bno, XFS_DATA_FORK, &eof, &lastx, &got, &prev);
L
Linus Torvalds 已提交
4238 4239
	end = bno + len;
	obno = bno;
4240

L
Linus Torvalds 已提交
4241
	while (bno < end && n < *nmap) {
4242 4243 4244 4245 4246 4247 4248 4249 4250 4251 4252
		if (eof || got.br_startoff > bno) {
			error = xfs_bmapi_reserve_delalloc(ip, bno, len, &got,
							   &prev, &lastx, eof);
			if (error) {
				if (n == 0) {
					*nmap = 0;
					return error;
				}
				break;
			}
		}
4253

4254 4255
		/* set up the extent map to return. */
		xfs_bmapi_trim_map(mval, &got, &bno, len, obno, end, n, flags);
4256 4257
		xfs_bmapi_update_map(&mval, &bno, &len, obno, end, &n, flags);

4258 4259
		/* If we're done, stop now. */
		if (bno >= end || n >= *nmap)
L
Linus Torvalds 已提交
4260
			break;
4261 4262

		/* Else go on to the next record. */
4263 4264 4265 4266
		prev = got;
		if (++lastx < ifp->if_bytes / sizeof(xfs_bmbt_rec_t))
			xfs_bmbt_get_all(xfs_iext_get_ext(ifp, lastx), &got);
		else
4267
			eof = 1;
L
Linus Torvalds 已提交
4268
	}
4269

L
Linus Torvalds 已提交
4270
	*nmap = n;
4271 4272
	return 0;
}
4273

4274

4275 4276
static int
xfs_bmapi_allocate(
4277 4278 4279 4280 4281 4282 4283 4284 4285 4286 4287
	struct xfs_bmalloca	*bma)
{
	struct xfs_mount	*mp = bma->ip->i_mount;
	int			whichfork = (bma->flags & XFS_BMAPI_ATTRFORK) ?
						XFS_ATTR_FORK : XFS_DATA_FORK;
	struct xfs_ifork	*ifp = XFS_IFORK_PTR(bma->ip, whichfork);
	int			tmp_logflags = 0;
	int			error;

	ASSERT(bma->length > 0);

L
Linus Torvalds 已提交
4288
	/*
4289 4290
	 * For the wasdelay case, we could also just allocate the stuff asked
	 * for in this bmap call but that wouldn't be as good.
L
Linus Torvalds 已提交
4291
	 */
4292 4293 4294 4295 4296 4297
	if (bma->wasdel) {
		bma->length = (xfs_extlen_t)bma->got.br_blockcount;
		bma->offset = bma->got.br_startoff;
		if (bma->idx != NULLEXTNUM && bma->idx) {
			xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx - 1),
					 &bma->prev);
L
Linus Torvalds 已提交
4298
		}
4299 4300 4301 4302 4303
	} else {
		bma->length = XFS_FILBLKS_MIN(bma->length, MAXEXTLEN);
		if (!bma->eof)
			bma->length = XFS_FILBLKS_MIN(bma->length,
					bma->got.br_startoff - bma->offset);
L
Linus Torvalds 已提交
4304 4305
	}

4306 4307
	/*
	 * Indicate if this is the first user data in the file, or just any
4308 4309
	 * user data. And if it is userdata, indicate whether it needs to
	 * be initialised to zero during allocation.
4310 4311 4312 4313
	 */
	if (!(bma->flags & XFS_BMAPI_METADATA)) {
		bma->userdata = (bma->offset == 0) ?
			XFS_ALLOC_INITIAL_USER_DATA : XFS_ALLOC_USERDATA;
4314 4315
		if (bma->flags & XFS_BMAPI_ZERO)
			bma->userdata |= XFS_ALLOC_USERDATA_ZERO;
4316
	}
L
Linus Torvalds 已提交
4317

4318
	bma->minlen = (bma->flags & XFS_BMAPI_CONTIG) ? bma->length : 1;
C
Christoph Hellwig 已提交
4319

4320 4321 4322 4323 4324 4325 4326 4327 4328
	/*
	 * 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 && bma->length >= mp->m_dalign &&
	    !(bma->flags & XFS_BMAPI_METADATA) && whichfork == XFS_DATA_FORK) {
		error = xfs_bmap_isaeof(bma, whichfork);
		if (error)
			return error;
L
Linus Torvalds 已提交
4329
	}
4330

4331 4332
	error = xfs_bmap_alloc(bma);
	if (error)
L
Linus Torvalds 已提交
4333
		return error;
4334 4335 4336 4337 4338 4339

	if (bma->flist->xbf_low)
		bma->minleft = 0;
	if (bma->cur)
		bma->cur->bc_private.b.firstblock = *bma->firstblock;
	if (bma->blkno == NULLFSBLOCK)
L
Linus Torvalds 已提交
4340
		return 0;
4341 4342 4343 4344
	if ((ifp->if_flags & XFS_IFBROOT) && !bma->cur) {
		bma->cur = xfs_bmbt_init_cursor(mp, bma->tp, bma->ip, whichfork);
		bma->cur->bc_private.b.firstblock = *bma->firstblock;
		bma->cur->bc_private.b.flist = bma->flist;
L
Linus Torvalds 已提交
4345
	}
4346 4347 4348 4349 4350 4351 4352 4353 4354 4355 4356 4357 4358 4359
	/*
	 * Bump the number of extents we've allocated
	 * in this call.
	 */
	bma->nallocs++;

	if (bma->cur)
		bma->cur->bc_private.b.flags =
			bma->wasdel ? XFS_BTCUR_BPRV_WASDEL : 0;

	bma->got.br_startoff = bma->offset;
	bma->got.br_startblock = bma->blkno;
	bma->got.br_blockcount = bma->length;
	bma->got.br_state = XFS_EXT_NORM;
4360

L
Linus Torvalds 已提交
4361
	/*
4362 4363
	 * A wasdelay extent has been initialized, so shouldn't be flagged
	 * as unwritten.
L
Linus Torvalds 已提交
4364
	 */
4365 4366 4367 4368 4369 4370 4371 4372 4373 4374 4375 4376 4377 4378 4379 4380 4381 4382 4383 4384 4385 4386 4387 4388 4389 4390 4391 4392 4393 4394 4395 4396 4397 4398 4399 4400 4401 4402 4403 4404 4405 4406 4407 4408 4409 4410 4411 4412 4413 4414 4415 4416 4417 4418 4419 4420 4421 4422 4423 4424 4425
	if (!bma->wasdel && (bma->flags & XFS_BMAPI_PREALLOC) &&
	    xfs_sb_version_hasextflgbit(&mp->m_sb))
		bma->got.br_state = XFS_EXT_UNWRITTEN;

	if (bma->wasdel)
		error = xfs_bmap_add_extent_delay_real(bma);
	else
		error = xfs_bmap_add_extent_hole_real(bma, whichfork);

	bma->logflags |= tmp_logflags;
	if (error)
		return error;

	/*
	 * Update our extent pointer, given that xfs_bmap_add_extent_delay_real
	 * or xfs_bmap_add_extent_hole_real might have merged it into one of
	 * the neighbouring ones.
	 */
	xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx), &bma->got);

	ASSERT(bma->got.br_startoff <= bma->offset);
	ASSERT(bma->got.br_startoff + bma->got.br_blockcount >=
	       bma->offset + bma->length);
	ASSERT(bma->got.br_state == XFS_EXT_NORM ||
	       bma->got.br_state == XFS_EXT_UNWRITTEN);
	return 0;
}

STATIC int
xfs_bmapi_convert_unwritten(
	struct xfs_bmalloca	*bma,
	struct xfs_bmbt_irec	*mval,
	xfs_filblks_t		len,
	int			flags)
{
	int			whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
						XFS_ATTR_FORK : XFS_DATA_FORK;
	struct xfs_ifork	*ifp = XFS_IFORK_PTR(bma->ip, whichfork);
	int			tmp_logflags = 0;
	int			error;

	/* check if we need to do unwritten->real conversion */
	if (mval->br_state == XFS_EXT_UNWRITTEN &&
	    (flags & XFS_BMAPI_PREALLOC))
		return 0;

	/* check if we need to do real->unwritten conversion */
	if (mval->br_state == XFS_EXT_NORM &&
	    (flags & (XFS_BMAPI_PREALLOC | XFS_BMAPI_CONVERT)) !=
			(XFS_BMAPI_PREALLOC | XFS_BMAPI_CONVERT))
		return 0;

	/*
	 * Modify (by adding) the state flag, if writing.
	 */
	ASSERT(mval->br_blockcount <= len);
	if ((ifp->if_flags & XFS_IFBROOT) && !bma->cur) {
		bma->cur = xfs_bmbt_init_cursor(bma->ip->i_mount, bma->tp,
					bma->ip, whichfork);
		bma->cur->bc_private.b.firstblock = *bma->firstblock;
		bma->cur->bc_private.b.flist = bma->flist;
L
Linus Torvalds 已提交
4426
	}
4427 4428
	mval->br_state = (mval->br_state == XFS_EXT_UNWRITTEN)
				? XFS_EXT_NORM : XFS_EXT_UNWRITTEN;
4429

4430 4431 4432 4433 4434 4435 4436 4437 4438 4439 4440
	/*
	 * Before insertion into the bmbt, zero the range being converted
	 * if required.
	 */
	if (flags & XFS_BMAPI_ZERO) {
		error = xfs_zero_extent(bma->ip, mval->br_startblock,
					mval->br_blockcount);
		if (error)
			return error;
	}

4441 4442 4443
	error = xfs_bmap_add_extent_unwritten_real(bma->tp, bma->ip, &bma->idx,
			&bma->cur, mval, bma->firstblock, bma->flist,
			&tmp_logflags);
4444 4445 4446 4447 4448 4449 4450 4451 4452
	/*
	 * Log the inode core unconditionally in the unwritten extent conversion
	 * path because the conversion might not have done so (e.g., if the
	 * extent count hasn't changed). We need to make sure the inode is dirty
	 * in the transaction for the sake of fsync(), even if nothing has
	 * changed, because fsync() will not force the log for this transaction
	 * unless it sees the inode pinned.
	 */
	bma->logflags |= tmp_logflags | XFS_ILOG_CORE;
4453 4454 4455 4456 4457 4458 4459 4460 4461 4462 4463 4464 4465 4466 4467
	if (error)
		return error;

	/*
	 * Update our extent pointer, given that
	 * xfs_bmap_add_extent_unwritten_real might have merged it into one
	 * of the neighbouring ones.
	 */
	xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx), &bma->got);

	/*
	 * We may have combined previously unwritten space with written space,
	 * so generate another request.
	 */
	if (mval->br_blockcount < len)
D
Dave Chinner 已提交
4468
		return -EAGAIN;
4469 4470 4471 4472 4473 4474 4475 4476 4477 4478 4479 4480 4481 4482 4483 4484 4485 4486 4487 4488 4489 4490 4491 4492 4493 4494 4495 4496 4497 4498 4499
	return 0;
}

/*
 * Map file blocks to filesystem blocks, and allocate blocks or convert the
 * extent state if necessary.  Details behaviour is controlled by the flags
 * parameter.  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
xfs_bmapi_write(
	struct xfs_trans	*tp,		/* transaction pointer */
	struct xfs_inode	*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 */
	struct xfs_bmbt_irec	*mval,		/* output: map values */
	int			*nmap,		/* i/o: mval size/count */
	struct xfs_bmap_free	*flist)		/* i/o: list extents to free */
{
	struct xfs_mount	*mp = ip->i_mount;
	struct xfs_ifork	*ifp;
4500
	struct xfs_bmalloca	bma = { NULL };	/* args for xfs_bmap_alloc */
4501 4502 4503 4504 4505 4506 4507 4508 4509 4510 4511 4512 4513 4514 4515 4516 4517 4518 4519 4520 4521 4522
	xfs_fileoff_t		end;		/* end of mapped file region */
	int			eof;		/* after the end of extents */
	int			error;		/* error return */
	int			n;		/* current extent index */
	xfs_fileoff_t		obno;		/* old block number (offset) */
	int			whichfork;	/* data or attr fork */
	char			inhole;		/* current location is hole in file */
	char			wasdelay;	/* old extent was delayed */

#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 */
	struct xfs_bmbt_irec	*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
4523 4524
	whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
		XFS_ATTR_FORK : XFS_DATA_FORK;
4525 4526 4527 4528 4529 4530

	ASSERT(*nmap >= 1);
	ASSERT(*nmap <= XFS_BMAP_MAX_NMAP);
	ASSERT(!(flags & XFS_BMAPI_IGSTATE));
	ASSERT(tp != NULL);
	ASSERT(len > 0);
4531
	ASSERT(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL);
4532
	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
4533

4534 4535 4536 4537 4538 4539 4540 4541 4542 4543 4544 4545
	/* zeroing is for currently only for data extents, not metadata */
	ASSERT((flags & (XFS_BMAPI_METADATA | XFS_BMAPI_ZERO)) !=
			(XFS_BMAPI_METADATA | XFS_BMAPI_ZERO));
	/*
	 * we can allocate unwritten extents or pre-zero allocated blocks,
	 * but it makes no sense to do both at once. This would result in
	 * zeroing the unwritten extent twice, but it still being an
	 * unwritten extent....
	 */
	ASSERT((flags & (XFS_BMAPI_PREALLOC | XFS_BMAPI_ZERO)) !=
			(XFS_BMAPI_PREALLOC | XFS_BMAPI_ZERO));

4546 4547
	if (unlikely(XFS_TEST_ERROR(
	    (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
4548
	     XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE),
4549 4550
	     mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) {
		XFS_ERROR_REPORT("xfs_bmapi_write", XFS_ERRLEVEL_LOW, mp);
D
Dave Chinner 已提交
4551
		return -EFSCORRUPTED;
4552 4553
	}

4554
	if (XFS_FORCED_SHUTDOWN(mp))
D
Dave Chinner 已提交
4555
		return -EIO;
4556 4557 4558 4559 4560 4561 4562 4563 4564 4565 4566 4567 4568 4569 4570 4571 4572 4573 4574 4575 4576 4577 4578 4579 4580 4581 4582 4583 4584 4585 4586 4587 4588 4589 4590 4591 4592

	ifp = XFS_IFORK_PTR(ip, whichfork);

	XFS_STATS_INC(xs_blk_mapw);

	if (*firstblock == NULLFSBLOCK) {
		if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE)
			bma.minleft = be16_to_cpu(ifp->if_broot->bb_level) + 1;
		else
			bma.minleft = 1;
	} else {
		bma.minleft = 0;
	}

	if (!(ifp->if_flags & XFS_IFEXTENTS)) {
		error = xfs_iread_extents(tp, ip, whichfork);
		if (error)
			goto error0;
	}

	xfs_bmap_search_extents(ip, bno, whichfork, &eof, &bma.idx, &bma.got,
				&bma.prev);
	n = 0;
	end = bno + len;
	obno = bno;

	bma.tp = tp;
	bma.ip = ip;
	bma.total = total;
	bma.userdata = 0;
	bma.flist = flist;
	bma.firstblock = firstblock;

	while (bno < end && n < *nmap) {
		inhole = eof || bma.got.br_startoff > bno;
		wasdelay = !inhole && isnullstartblock(bma.got.br_startblock);

L
Linus Torvalds 已提交
4593
		/*
4594 4595
		 * First, deal with the hole before the allocated space
		 * that we found, if any.
L
Linus Torvalds 已提交
4596
		 */
4597 4598 4599 4600 4601 4602 4603
		if (inhole || wasdelay) {
			bma.eof = eof;
			bma.conv = !!(flags & XFS_BMAPI_CONVERT);
			bma.wasdel = wasdelay;
			bma.offset = bno;
			bma.flags = flags;

L
Linus Torvalds 已提交
4604
			/*
4605 4606 4607 4608 4609
			 * There's a 32/64 bit type mismatch between the
			 * allocation length request (which can be 64 bits in
			 * length) and the bma length request, which is
			 * xfs_extlen_t and therefore 32 bits. Hence we have to
			 * check for 32-bit overflows and handle them here.
L
Linus Torvalds 已提交
4610
			 */
4611 4612 4613 4614 4615 4616 4617 4618
			if (len > (xfs_filblks_t)MAXEXTLEN)
				bma.length = MAXEXTLEN;
			else
				bma.length = len;

			ASSERT(len > 0);
			ASSERT(bma.length > 0);
			error = xfs_bmapi_allocate(&bma);
L
Linus Torvalds 已提交
4619 4620
			if (error)
				goto error0;
4621 4622
			if (bma.blkno == NULLFSBLOCK)
				break;
L
Linus Torvalds 已提交
4623
		}
4624 4625 4626 4627 4628 4629 4630

		/* Deal with the allocated space we found.  */
		xfs_bmapi_trim_map(mval, &bma.got, &bno, len, obno,
							end, n, flags);

		/* Execute unwritten extent conversion if necessary */
		error = xfs_bmapi_convert_unwritten(&bma, mval, len, flags);
D
Dave Chinner 已提交
4631
		if (error == -EAGAIN)
4632 4633 4634 4635 4636 4637 4638 4639 4640 4641 4642 4643 4644 4645 4646 4647 4648 4649 4650 4651 4652 4653 4654 4655 4656 4657 4658 4659 4660 4661 4662 4663 4664 4665 4666 4667 4668 4669 4670 4671 4672 4673 4674 4675 4676 4677 4678 4679 4680 4681 4682 4683 4684 4685 4686 4687 4688 4689 4690 4691 4692 4693 4694 4695 4696 4697 4698 4699 4700 4701 4702 4703 4704
			continue;
		if (error)
			goto error0;

		/* update the extent map to return */
		xfs_bmapi_update_map(&mval, &bno, &len, obno, end, &n, flags);

		/*
		 * 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 || bma.nallocs >= *nmap)
			break;

		/* Else go on to the next record. */
		bma.prev = bma.got;
		if (++bma.idx < ifp->if_bytes / sizeof(xfs_bmbt_rec_t)) {
			xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma.idx),
					 &bma.got);
		} else
			eof = 1;
	}
	*nmap = n;

	/*
	 * Transform from btree to extents, give it cur.
	 */
	if (xfs_bmap_wants_extents(ip, whichfork)) {
		int		tmp_logflags = 0;

		ASSERT(bma.cur);
		error = xfs_bmap_btree_to_extents(tp, ip, bma.cur,
			&tmp_logflags, whichfork);
		bma.logflags |= tmp_logflags;
		if (error)
			goto error0;
	}

	ASSERT(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE ||
	       XFS_IFORK_NEXTENTS(ip, whichfork) >
		XFS_IFORK_MAXEXT(ip, whichfork));
	error = 0;
error0:
	/*
	 * Log everything.  Do this after conversion, there's no point in
	 * logging the extent records if we've converted to btree format.
	 */
	if ((bma.logflags & xfs_ilog_fext(whichfork)) &&
	    XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
		bma.logflags &= ~xfs_ilog_fext(whichfork);
	else if ((bma.logflags & xfs_ilog_fbroot(whichfork)) &&
		 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)
		bma.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 (bma.logflags)
		xfs_trans_log_inode(tp, ip, bma.logflags);

	if (bma.cur) {
		if (!error) {
			ASSERT(*firstblock == NULLFSBLOCK ||
			       XFS_FSB_TO_AGNO(mp, *firstblock) ==
			       XFS_FSB_TO_AGNO(mp,
				       bma.cur->bc_private.b.firstblock) ||
			       (flist->xbf_low &&
				XFS_FSB_TO_AGNO(mp, *firstblock) <
				XFS_FSB_TO_AGNO(mp,
					bma.cur->bc_private.b.firstblock)));
			*firstblock = bma.cur->bc_private.b.firstblock;
L
Linus Torvalds 已提交
4705
		}
4706 4707 4708 4709 4710 4711 4712 4713
		xfs_btree_del_cursor(bma.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;
}
4714

4715 4716 4717 4718 4719 4720 4721 4722 4723 4724 4725 4726 4727 4728 4729 4730 4731 4732 4733 4734 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 4763 4764 4765 4766 4767 4768 4769 4770 4771 4772 4773 4774 4775 4776 4777 4778 4779 4780 4781 4782 4783 4784 4785 4786 4787 4788 4789 4790 4791 4792 4793 4794 4795 4796 4797 4798 4799
/*
 * Called by xfs_bmapi to update file extent records and the btree
 * 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 */
	xfs_bmbt_irec_t		*del,	/* data to remove from extents */
	int			*logflagsp, /* inode logging flags */
	int			whichfork) /* data or attr fork */
{
	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 */
	xfs_bmbt_rec_host_t	*ep;	/* current extent entry pointer */
	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 */
	int			state = 0;

	XFS_STATS_INC(xs_del_exlist);

	if (whichfork == XFS_ATTR_FORK)
		state |= BMAP_ATTRFORK;

	mp = ip->i_mount;
	ifp = XFS_IFORK_PTR(ip, whichfork);
	ASSERT((*idx >= 0) && (*idx < ifp->if_bytes /
		(uint)sizeof(xfs_bmbt_rec_t)));
	ASSERT(del->br_blockcount > 0);
	ep = xfs_iext_get_ext(ifp, *idx);
	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 && XFS_IS_REALTIME_INODE(ip)) {
			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);
			error = xfs_rtfree_extent(tp, bno, (xfs_extlen_t)len);
			if (error)
				goto done;
			do_fx = 0;
			nblks = len * mp->m_sb.sb_rextsize;
			qfield = XFS_TRANS_DQ_RTBCOUNT;
		}
L
Linus Torvalds 已提交
4800
		/*
4801
		 * Ordinary allocation.
L
Linus Torvalds 已提交
4802
		 */
4803 4804 4805 4806
		else {
			do_fx = 1;
			nblks = del->br_blockcount;
			qfield = XFS_TRANS_DQ_BCOUNT;
L
Linus Torvalds 已提交
4807 4808
		}
		/*
4809
		 * Set up del_endblock and cur for later.
L
Linus Torvalds 已提交
4810
		 */
4811 4812 4813 4814 4815 4816
		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;
4817
			XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
L
Linus Torvalds 已提交
4818
		}
4819 4820 4821 4822 4823 4824
		da_old = da_new = 0;
	} else {
		da_old = startblockval(got.br_startblock);
		da_new = 0;
		nblks = 0;
		do_fx = 0;
L
Linus Torvalds 已提交
4825 4826
	}
	/*
4827 4828
	 * Set flag value to use in switch statement.
	 * Left-contig is 2, right-contig is 1.
L
Linus Torvalds 已提交
4829
	 */
4830 4831 4832 4833 4834 4835 4836 4837 4838 4839 4840 4841 4842 4843 4844 4845 4846 4847 4848 4849 4850
	switch (((got.br_startoff == del->br_startoff) << 1) |
		(got_endoff == del_endoff)) {
	case 3:
		/*
		 * Matches the whole extent.  Delete the entry.
		 */
		xfs_iext_remove(ip, *idx, 1,
				whichfork == XFS_ATTR_FORK ? BMAP_ATTRFORK : 0);
		--*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_btree_delete(cur, &i)))
			goto done;
4851
		XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
4852 4853 4854 4855 4856 4857 4858 4859 4860 4861 4862 4863 4864 4865 4866 4867 4868 4869 4870 4871 4872 4873 4874 4875 4876 4877 4878 4879 4880 4881 4882 4883 4884 4885 4886 4887 4888 4889 4890 4891 4892 4893 4894 4895 4896 4897 4898 4899 4900 4901 4902 4903 4904 4905 4906 4907 4908 4909 4910 4911 4912 4913 4914 4915 4916 4917 4918 4919 4920 4921 4922 4923 4924 4925 4926 4927 4928 4929 4930 4931 4932
		break;

	case 2:
		/*
		 * Deleting the first part of the extent.
		 */
		trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
		xfs_bmbt_set_startoff(ep, del_endoff);
		temp = got.br_blockcount - del->br_blockcount;
		xfs_bmbt_set_blockcount(ep, temp);
		if (delay) {
			temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
				da_old);
			xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
			trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
			da_new = temp;
			break;
		}
		xfs_bmbt_set_startblock(ep, del_endblock);
		trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
		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;
		trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
		xfs_bmbt_set_blockcount(ep, temp);
		if (delay) {
			temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
				da_old);
			xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
			trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
			da_new = temp;
			break;
		}
		trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
		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;
		trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
		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_btree_increment(cur, 0, &i)))
					goto done;
				cur->bc_rec.b = new;
				error = xfs_btree_insert(cur, &i);
D
Dave Chinner 已提交
4933
				if (error && error != -ENOSPC)
4934 4935 4936 4937 4938 4939 4940
					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.
				 */
D
Dave Chinner 已提交
4941
				if (error == -ENOSPC) {
4942 4943 4944 4945 4946 4947 4948 4949 4950
					/*
					 * 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;
4951 4952
					XFS_WANT_CORRUPTED_GOTO(mp,
								i == 1, done);
4953 4954 4955 4956 4957 4958 4959 4960 4961 4962 4963 4964 4965 4966 4967 4968 4969
					/*
					 * 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;
D
Dave Chinner 已提交
4970
					error = -ENOSPC;
4971 4972
					goto done;
				}
4973
				XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
4974 4975 4976 4977 4978 4979 4980 4981 4982 4983 4984 4985 4986 4987 4988 4989 4990 4991 4992 4993 4994 4995 4996 4997 4998 4999 5000 5001 5002 5003 5004 5005
			} 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);
				}
			}
		}
		trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
		xfs_iext_insert(ip, *idx + 1, 1, &new, state);
		++*idx;
		break;
L
Linus Torvalds 已提交
5006 5007
	}
	/*
5008
	 * If we need to, add to list of extents to delete.
L
Linus Torvalds 已提交
5009
	 */
5010 5011 5012
	if (do_fx)
		xfs_bmap_add_free(del->br_startblock, del->br_blockcount, flist,
			mp);
L
Linus Torvalds 已提交
5013
	/*
5014
	 * Adjust inode # blocks in the file.
L
Linus Torvalds 已提交
5015
	 */
5016 5017
	if (nblks)
		ip->i_d.di_nblocks -= nblks;
L
Linus Torvalds 已提交
5018
	/*
5019
	 * Adjust quota data.
L
Linus Torvalds 已提交
5020
	 */
5021 5022 5023 5024 5025 5026 5027 5028
	if (qfield)
		xfs_trans_mod_dquot_byino(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);
5029 5030
	if (da_old > da_new)
		xfs_mod_fdblocks(mp, (int64_t)(da_old - da_new), false);
5031 5032
done:
	*logflagsp = flags;
L
Linus Torvalds 已提交
5033 5034 5035
	return error;
}

5036
/*
5037 5038 5039 5040
 * 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.
5041
 */
5042 5043 5044 5045 5046 5047 5048 5049 5050 5051 5052 5053
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 */
	int			*done)		/* set if not done yet */
5054
{
5055 5056 5057 5058 5059 5060 5061
	xfs_btree_cur_t		*cur;		/* bmap btree cursor */
	xfs_bmbt_irec_t		del;		/* extent being deleted */
	int			eof;		/* is deleting at eof */
	xfs_bmbt_rec_host_t	*ep;		/* extent record pointer */
	int			error;		/* error return value */
	xfs_extnum_t		extno;		/* extent number in list */
	xfs_bmbt_irec_t		got;		/* current extent record */
E
Eric Sandeen 已提交
5062
	xfs_ifork_t		*ifp;		/* inode fork pointer */
5063 5064 5065 5066 5067 5068 5069 5070 5071 5072 5073 5074
	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 */
	xfs_extnum_t		nextents;	/* number of file extents */
	xfs_bmbt_irec_t		prev;		/* previous extent record */
	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 */
	xfs_fsblock_t		sum;
L
Linus Torvalds 已提交
5075

5076
	trace_xfs_bunmap(ip, bno, len, flags, _RET_IP_);
L
Linus Torvalds 已提交
5077

5078 5079 5080 5081 5082 5083 5084 5085
	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);
D
Dave Chinner 已提交
5086
		return -EFSCORRUPTED;
L
Linus Torvalds 已提交
5087
	}
5088 5089
	mp = ip->i_mount;
	if (XFS_FORCED_SHUTDOWN(mp))
D
Dave Chinner 已提交
5090
		return -EIO;
L
Linus Torvalds 已提交
5091

5092
	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
5093 5094
	ASSERT(len > 0);
	ASSERT(nexts >= 0);
L
Linus Torvalds 已提交
5095

5096 5097 5098 5099 5100 5101 5102 5103 5104 5105 5106 5107 5108 5109
	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);
	isrt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip);
	start = bno;
	bno = start + len - 1;
	ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
		&prev);
L
Linus Torvalds 已提交
5110

5111 5112 5113 5114 5115 5116 5117 5118 5119 5120 5121 5122 5123 5124 5125 5126 5127 5128 5129 5130 5131 5132 5133 5134 5135 5136
	/*
	 * 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) {
		ep = xfs_iext_get_ext(ifp, --lastx);
		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_bmbt_init_cursor(mp, tp, ip, whichfork);
		cur->bc_private.b.firstblock = *firstblock;
		cur->bc_private.b.flist = flist;
		cur->bc_private.b.flags = 0;
	} else
		cur = NULL;

	if (isrt) {
		/*
		 * Synchronize by locking the bitmap inode.
		 */
		xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL);
		xfs_trans_ijoin(tp, mp->m_rbmip, XFS_ILOCK_EXCL);
	}
5137

5138 5139 5140 5141 5142 5143 5144 5145 5146 5147 5148 5149 5150 5151 5152 5153 5154 5155 5156 5157 5158 5159 5160 5161 5162 5163 5164 5165 5166 5167 5168 5169 5170 5171 5172 5173 5174 5175 5176
	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;
			ep = xfs_iext_get_ext(ifp, lastx);
			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))) {
5177
			/*
5178 5179 5180 5181 5182
			 * 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.
5183
			 */
5184 5185 5186 5187 5188 5189 5190 5191 5192 5193 5194 5195 5196 5197 5198
			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)
						xfs_bmbt_get_all(xfs_iext_get_ext(
							ifp, lastx), &got);
				}
				continue;
L
Linus Torvalds 已提交
5199
			}
T
Tao Ma 已提交
5200
			/*
5201 5202
			 * It's written, turn it unwritten.
			 * This is better than zeroing it.
T
Tao Ma 已提交
5203
			 */
5204 5205 5206 5207 5208 5209 5210 5211 5212 5213 5214 5215 5216 5217 5218 5219 5220 5221 5222 5223 5224 5225 5226 5227 5228 5229 5230 5231 5232 5233 5234 5235 5236 5237 5238 5239 5240 5241 5242 5243 5244 5245 5246 5247 5248 5249 5250
			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_unwritten_real(tp, ip,
					&lastx, &cur, &del, firstblock, flist,
					&logflags);
			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 (got.br_startoff > bno) {
					if (--lastx >= 0) {
						ep = xfs_iext_get_ext(ifp,
								      lastx);
						xfs_bmbt_get_all(ep, &got);
					}
				}
T
Tao Ma 已提交
5251
				continue;
5252 5253 5254 5255 5256 5257 5258 5259 5260 5261 5262 5263 5264 5265 5266 5267 5268 5269 5270 5271 5272 5273 5274 5275 5276 5277 5278 5279 5280 5281 5282 5283 5284 5285 5286 5287 5288
			} 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);
				xfs_bmbt_get_all(xfs_iext_get_ext(ifp,
						lastx - 1), &prev);
				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;
				lastx--;
				error = xfs_bmap_add_extent_unwritten_real(tp,
						ip, &lastx, &cur, &prev,
						firstblock, flist, &logflags);
				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_unwritten_real(tp,
						ip, &lastx, &cur, &del,
						firstblock, flist, &logflags);
				if (error)
					goto error0;
				goto nodelete;
T
Tao Ma 已提交
5289
			}
L
Linus Torvalds 已提交
5290
		}
5291 5292 5293 5294 5295
		if (wasdel) {
			ASSERT(startblockval(del.br_startblock) > 0);
			/* Update realtime/data freespace, unreserve quota */
			if (isrt) {
				xfs_filblks_t rtexts;
L
Linus Torvalds 已提交
5296

5297 5298
				rtexts = XFS_FSB_TO_B(mp, del.br_blockcount);
				do_div(rtexts, mp->m_sb.sb_rextsize);
D
Dave Chinner 已提交
5299
				xfs_mod_frextents(mp, (int64_t)rtexts);
5300 5301 5302 5303
				(void)xfs_trans_reserve_quota_nblks(NULL,
					ip, -((long)del.br_blockcount), 0,
					XFS_QMOPT_RES_RTBLKS);
			} else {
5304 5305
				xfs_mod_fdblocks(mp, (int64_t)del.br_blockcount,
						 false);
5306 5307 5308 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
				(void)xfs_trans_reserve_quota_nblks(NULL,
					ip, -((long)del.br_blockcount), 0,
					XFS_QMOPT_RES_REGBLKS);
			}
			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) >= /* Note the >= */
			XFS_IFORK_MAXEXT(ip, whichfork) &&
		    del.br_startoff > got.br_startoff &&
		    del.br_startoff + del.br_blockcount <
		    got.br_startoff + got.br_blockcount) {
D
Dave Chinner 已提交
5334
			error = -ENOSPC;
5335
			goto error0;
L
Linus Torvalds 已提交
5336
		}
5337 5338 5339 5340 5341 5342 5343
		error = xfs_bmap_del_extent(ip, tp, &lastx, flist, cur, &del,
				&tmp_logflags, whichfork);
		logflags |= tmp_logflags;
		if (error)
			goto error0;
		bno = del.br_startoff - 1;
nodelete:
L
Linus Torvalds 已提交
5344
		/*
5345
		 * If not done go on to the next (previous) record.
L
Linus Torvalds 已提交
5346
		 */
5347 5348 5349 5350 5351 5352 5353 5354 5355
		if (bno != (xfs_fileoff_t)-1 && bno >= start) {
			if (lastx >= 0) {
				ep = xfs_iext_get_ext(ifp, lastx);
				if (xfs_bmbt_get_startoff(ep) > bno) {
					if (--lastx >= 0)
						ep = xfs_iext_get_ext(ifp,
								      lastx);
				}
				xfs_bmbt_get_all(ep, &got);
L
Linus Torvalds 已提交
5356
			}
5357
			extno++;
L
Linus Torvalds 已提交
5358 5359
		}
	}
5360
	*done = bno == (xfs_fileoff_t)-1 || bno < start || lastx < 0;
5361

L
Linus Torvalds 已提交
5362
	/*
5363
	 * Convert to a btree if necessary.
L
Linus Torvalds 已提交
5364
	 */
5365 5366 5367 5368 5369 5370 5371
	if (xfs_bmap_needs_btree(ip, whichfork)) {
		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;
L
Linus Torvalds 已提交
5372 5373
	}
	/*
5374
	 * transform from btree to extents, give it cur
L
Linus Torvalds 已提交
5375
	 */
5376 5377 5378 5379 5380 5381 5382 5383
	else if (xfs_bmap_wants_extents(ip, whichfork)) {
		ASSERT(cur != NULL);
		error = xfs_bmap_btree_to_extents(tp, ip, cur, &tmp_logflags,
			whichfork);
		logflags |= tmp_logflags;
		if (error)
			goto error0;
	}
L
Linus Torvalds 已提交
5384
	/*
5385
	 * transform from extents to local?
L
Linus Torvalds 已提交
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 5412 5413 5414
	error = 0;
error0:
	/*
	 * Log everything.  Do this after conversion, there's no point in
	 * logging the extent records if we've converted to btree format.
	 */
	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;
}
5415

5416 5417 5418 5419 5420 5421 5422 5423 5424 5425 5426 5427 5428 5429 5430 5431 5432 5433 5434 5435 5436 5437 5438 5439 5440 5441 5442 5443 5444 5445 5446 5447 5448 5449 5450 5451 5452 5453 5454 5455 5456 5457 5458 5459 5460 5461 5462 5463 5464 5465 5466
/*
 * Determine whether an extent shift can be accomplished by a merge with the
 * extent that precedes the target hole of the shift.
 */
STATIC bool
xfs_bmse_can_merge(
	struct xfs_bmbt_irec	*left,	/* preceding extent */
	struct xfs_bmbt_irec	*got,	/* current extent to shift */
	xfs_fileoff_t		shift)	/* shift fsb */
{
	xfs_fileoff_t		startoff;

	startoff = got->br_startoff - shift;

	/*
	 * The extent, once shifted, must be adjacent in-file and on-disk with
	 * the preceding extent.
	 */
	if ((left->br_startoff + left->br_blockcount != startoff) ||
	    (left->br_startblock + left->br_blockcount != got->br_startblock) ||
	    (left->br_state != got->br_state) ||
	    (left->br_blockcount + got->br_blockcount > MAXEXTLEN))
		return false;

	return true;
}

/*
 * A bmap extent shift adjusts the file offset of an extent to fill a preceding
 * hole in the file. If an extent shift would result in the extent being fully
 * adjacent to the extent that currently precedes the hole, we can merge with
 * the preceding extent rather than do the shift.
 *
 * This function assumes the caller has verified a shift-by-merge is possible
 * with the provided extents via xfs_bmse_can_merge().
 */
STATIC int
xfs_bmse_merge(
	struct xfs_inode		*ip,
	int				whichfork,
	xfs_fileoff_t			shift,		/* shift fsb */
	int				current_ext,	/* idx of gotp */
	struct xfs_bmbt_rec_host	*gotp,		/* extent to shift */
	struct xfs_bmbt_rec_host	*leftp,		/* preceding extent */
	struct xfs_btree_cur		*cur,
	int				*logflags)	/* output */
{
	struct xfs_bmbt_irec		got;
	struct xfs_bmbt_irec		left;
	xfs_filblks_t			blockcount;
	int				error, i;
5467
	struct xfs_mount		*mp = ip->i_mount;
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 5497 5498 5499 5500

	xfs_bmbt_get_all(gotp, &got);
	xfs_bmbt_get_all(leftp, &left);
	blockcount = left.br_blockcount + got.br_blockcount;

	ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
	ASSERT(xfs_bmse_can_merge(&left, &got, shift));

	/*
	 * Merge the in-core extents. Note that the host record pointers and
	 * current_ext index are invalid once the extent has been removed via
	 * xfs_iext_remove().
	 */
	xfs_bmbt_set_blockcount(leftp, blockcount);
	xfs_iext_remove(ip, current_ext, 1, 0);

	/*
	 * Update the on-disk extent count, the btree if necessary and log the
	 * inode.
	 */
	XFS_IFORK_NEXT_SET(ip, whichfork,
			   XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
	*logflags |= XFS_ILOG_CORE;
	if (!cur) {
		*logflags |= XFS_ILOG_DEXT;
		return 0;
	}

	/* lookup and remove the extent to merge */
	error = xfs_bmbt_lookup_eq(cur, got.br_startoff, got.br_startblock,
				   got.br_blockcount, &i);
	if (error)
D
Dave Chinner 已提交
5501
		return error;
5502
	XFS_WANT_CORRUPTED_RETURN(mp, i == 1);
5503 5504 5505

	error = xfs_btree_delete(cur, &i);
	if (error)
D
Dave Chinner 已提交
5506
		return error;
5507
	XFS_WANT_CORRUPTED_RETURN(mp, i == 1);
5508 5509 5510 5511 5512

	/* lookup and update size of the previous extent */
	error = xfs_bmbt_lookup_eq(cur, left.br_startoff, left.br_startblock,
				   left.br_blockcount, &i);
	if (error)
D
Dave Chinner 已提交
5513
		return error;
5514
	XFS_WANT_CORRUPTED_RETURN(mp, i == 1);
5515 5516 5517

	left.br_blockcount = blockcount;

D
Dave Chinner 已提交
5518 5519
	return xfs_bmbt_update(cur, left.br_startoff, left.br_startblock,
			       left.br_blockcount, left.br_state);
5520 5521
}

5522 5523 5524 5525 5526 5527 5528 5529 5530 5531 5532
/*
 * Shift a single extent.
 */
STATIC int
xfs_bmse_shift_one(
	struct xfs_inode		*ip,
	int				whichfork,
	xfs_fileoff_t			offset_shift_fsb,
	int				*current_ext,
	struct xfs_bmbt_rec_host	*gotp,
	struct xfs_btree_cur		*cur,
5533 5534
	int				*logflags,
	enum shift_direction		direction)
5535 5536
{
	struct xfs_ifork		*ifp;
5537
	struct xfs_mount		*mp;
5538
	xfs_fileoff_t			startoff;
5539
	struct xfs_bmbt_rec_host	*adj_irecp;
5540
	struct xfs_bmbt_irec		got;
5541
	struct xfs_bmbt_irec		adj_irec;
5542 5543
	int				error;
	int				i;
5544
	int				total_extents;
5545

5546
	mp = ip->i_mount;
5547
	ifp = XFS_IFORK_PTR(ip, whichfork);
5548
	total_extents = ifp->if_bytes / sizeof(xfs_bmbt_rec_t);
5549 5550 5551

	xfs_bmbt_get_all(gotp, &got);

5552
	/* delalloc extents should be prevented by caller */
5553
	XFS_WANT_CORRUPTED_RETURN(mp, !isnullstartblock(got.br_startblock));
5554

5555 5556 5557 5558 5559 5560 5561 5562 5563 5564 5565 5566 5567 5568 5569 5570 5571 5572 5573
	if (direction == SHIFT_LEFT) {
		startoff = got.br_startoff - offset_shift_fsb;

		/*
		 * Check for merge if we've got an extent to the left,
		 * otherwise make sure there's enough room at the start
		 * of the file for the shift.
		 */
		if (!*current_ext) {
			if (got.br_startoff < offset_shift_fsb)
				return -EINVAL;
			goto update_current_ext;
		}
		/*
		 * grab the left extent and check for a large
		 * enough hole.
		 */
		adj_irecp = xfs_iext_get_ext(ifp, *current_ext - 1);
		xfs_bmbt_get_all(adj_irecp, &adj_irec);
5574

5575 5576
		if (startoff <
		    adj_irec.br_startoff + adj_irec.br_blockcount)
5577
			return -EINVAL;
5578

5579
		/* check whether to merge the extent or shift it down */
5580 5581
		if (xfs_bmse_can_merge(&adj_irec, &got,
				       offset_shift_fsb)) {
5582
			return xfs_bmse_merge(ip, whichfork, offset_shift_fsb,
5583 5584
					      *current_ext, gotp, adj_irecp,
					      cur, logflags);
5585
		}
5586 5587 5588 5589 5590 5591 5592 5593 5594 5595 5596 5597 5598 5599 5600 5601 5602 5603 5604 5605 5606 5607 5608 5609
	} else {
		startoff = got.br_startoff + offset_shift_fsb;
		/* nothing to move if this is the last extent */
		if (*current_ext >= (total_extents - 1))
			goto update_current_ext;
		/*
		 * If this is not the last extent in the file, make sure there
		 * is enough room between current extent and next extent for
		 * accommodating the shift.
		 */
		adj_irecp = xfs_iext_get_ext(ifp, *current_ext + 1);
		xfs_bmbt_get_all(adj_irecp, &adj_irec);
		if (startoff + got.br_blockcount > adj_irec.br_startoff)
			return -EINVAL;
		/*
		 * Unlike a left shift (which involves a hole punch),
		 * a right shift does not modify extent neighbors
		 * in any way. We should never find mergeable extents
		 * in this scenario. Check anyways and warn if we
		 * encounter two extents that could be one.
		 */
		if (xfs_bmse_can_merge(&got, &adj_irec, offset_shift_fsb))
			WARN_ON_ONCE(1);
	}
5610 5611 5612 5613
	/*
	 * Increment the extent index for the next iteration, update the start
	 * offset of the in-core extent and update the btree if applicable.
	 */
5614 5615 5616 5617 5618
update_current_ext:
	if (direction == SHIFT_LEFT)
		(*current_ext)++;
	else
		(*current_ext)--;
5619 5620 5621 5622 5623 5624 5625 5626 5627 5628 5629
	xfs_bmbt_set_startoff(gotp, startoff);
	*logflags |= XFS_ILOG_CORE;
	if (!cur) {
		*logflags |= XFS_ILOG_DEXT;
		return 0;
	}

	error = xfs_bmbt_lookup_eq(cur, got.br_startoff, got.br_startblock,
				   got.br_blockcount, &i);
	if (error)
		return error;
5630
	XFS_WANT_CORRUPTED_RETURN(mp, i == 1);
5631 5632

	got.br_startoff = startoff;
5633
	return xfs_bmbt_update(cur, got.br_startoff, got.br_startblock,
5634
			       got.br_blockcount, got.br_state);
5635 5636
}

5637
/*
5638
 * Shift extent records to the left/right to cover/create a hole.
5639
 *
5640
 * The maximum number of extents to be shifted in a single operation is
5641
 * @num_exts. @stop_fsb specifies the file offset at which to stop shift and the
5642 5643 5644 5645
 * file offset where we've left off is returned in @next_fsb. @offset_shift_fsb
 * is the length by which each extent is shifted. If there is no hole to shift
 * the extents into, this will be considered invalid operation and we abort
 * immediately.
5646 5647 5648 5649 5650
 */
int
xfs_bmap_shift_extents(
	struct xfs_trans	*tp,
	struct xfs_inode	*ip,
5651
	xfs_fileoff_t		*next_fsb,
5652
	xfs_fileoff_t		offset_shift_fsb,
5653
	int			*done,
5654
	xfs_fileoff_t		stop_fsb,
5655 5656
	xfs_fsblock_t		*firstblock,
	struct xfs_bmap_free	*flist,
5657
	enum shift_direction	direction,
5658 5659
	int			num_exts)
{
5660
	struct xfs_btree_cur		*cur = NULL;
5661 5662 5663 5664 5665
	struct xfs_bmbt_rec_host	*gotp;
	struct xfs_bmbt_irec            got;
	struct xfs_mount		*mp = ip->i_mount;
	struct xfs_ifork		*ifp;
	xfs_extnum_t			nexts = 0;
5666
	xfs_extnum_t			current_ext;
5667 5668
	xfs_extnum_t			total_extents;
	xfs_extnum_t			stop_extent;
5669 5670
	int				error = 0;
	int				whichfork = XFS_DATA_FORK;
5671
	int				logflags = 0;
5672 5673 5674 5675 5676 5677 5678

	if (unlikely(XFS_TEST_ERROR(
	    (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
	     XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE),
	     mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) {
		XFS_ERROR_REPORT("xfs_bmap_shift_extents",
				 XFS_ERRLEVEL_LOW, mp);
D
Dave Chinner 已提交
5679
		return -EFSCORRUPTED;
5680 5681 5682
	}

	if (XFS_FORCED_SHUTDOWN(mp))
D
Dave Chinner 已提交
5683
		return -EIO;
5684

5685 5686
	ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
5687 5688
	ASSERT(direction == SHIFT_LEFT || direction == SHIFT_RIGHT);
	ASSERT(*next_fsb != NULLFSBLOCK || direction == SHIFT_RIGHT);
5689 5690 5691 5692 5693 5694 5695 5696 5697

	ifp = XFS_IFORK_PTR(ip, whichfork);
	if (!(ifp->if_flags & XFS_IFEXTENTS)) {
		/* Read in all the extents */
		error = xfs_iread_extents(tp, ip, whichfork);
		if (error)
			return error;
	}

5698 5699 5700 5701 5702 5703 5704
	if (ifp->if_flags & XFS_IFBROOT) {
		cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
		cur->bc_private.b.firstblock = *firstblock;
		cur->bc_private.b.flist = flist;
		cur->bc_private.b.flags = 0;
	}

5705 5706 5707 5708 5709 5710 5711 5712 5713 5714 5715 5716 5717 5718 5719 5720 5721 5722 5723 5724 5725 5726 5727 5728 5729 5730 5731 5732 5733 5734 5735 5736
	/*
	 * There may be delalloc extents in the data fork before the range we
	 * are collapsing out, so we cannot use the count of real extents here.
	 * Instead we have to calculate it from the incore fork.
	 */
	total_extents = ifp->if_bytes / sizeof(xfs_bmbt_rec_t);
	if (total_extents == 0) {
		*done = 1;
		goto del_cursor;
	}

	/*
	 * In case of first right shift, we need to initialize next_fsb
	 */
	if (*next_fsb == NULLFSBLOCK) {
		gotp = xfs_iext_get_ext(ifp, total_extents - 1);
		xfs_bmbt_get_all(gotp, &got);
		*next_fsb = got.br_startoff;
		if (stop_fsb > *next_fsb) {
			*done = 1;
			goto del_cursor;
		}
	}

	/* Lookup the extent index at which we have to stop */
	if (direction == SHIFT_RIGHT) {
		gotp = xfs_iext_bno_to_ext(ifp, stop_fsb, &stop_extent);
		/* Make stop_extent exclusive of shift range */
		stop_extent--;
	} else
		stop_extent = total_extents;

5737
	/*
5738 5739 5740 5741 5742
	 * Look up the extent index for the fsb where we start shifting. We can
	 * henceforth iterate with current_ext as extent list changes are locked
	 * out via ilock.
	 *
	 * gotp can be null in 2 cases: 1) if there are no extents or 2)
5743
	 * *next_fsb lies in a hole beyond which there are no extents. Either
5744
	 * way, we are done.
5745
	 */
5746
	gotp = xfs_iext_bno_to_ext(ifp, *next_fsb, &current_ext);
5747 5748
	if (!gotp) {
		*done = 1;
5749
		goto del_cursor;
5750 5751
	}

5752 5753 5754 5755 5756 5757 5758 5759
	/* some sanity checking before we finally start shifting extents */
	if ((direction == SHIFT_LEFT && current_ext >= stop_extent) ||
	     (direction == SHIFT_RIGHT && current_ext <= stop_extent)) {
		error = -EIO;
		goto del_cursor;
	}

	while (nexts++ < num_exts) {
5760
		error = xfs_bmse_shift_one(ip, whichfork, offset_shift_fsb,
5761 5762
					   &current_ext, gotp, cur, &logflags,
					   direction);
5763 5764
		if (error)
			goto del_cursor;
5765 5766 5767 5768 5769 5770 5771 5772
		/*
		 * If there was an extent merge during the shift, the extent
		 * count can change. Update the total and grade the next record.
		 */
		if (direction == SHIFT_LEFT) {
			total_extents = ifp->if_bytes / sizeof(xfs_bmbt_rec_t);
			stop_extent = total_extents;
		}
5773

5774 5775 5776
		if (current_ext == stop_extent) {
			*done = 1;
			*next_fsb = NULLFSBLOCK;
5777
			break;
5778
		}
5779
		gotp = xfs_iext_get_ext(ifp, current_ext);
5780 5781
	}

5782
	if (!*done) {
5783
		xfs_bmbt_get_all(gotp, &got);
5784
		*next_fsb = got.br_startoff;
5785
	}
5786 5787 5788 5789 5790 5791

del_cursor:
	if (cur)
		xfs_btree_del_cursor(cur,
			error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);

5792 5793
	if (logflags)
		xfs_trans_log_inode(tp, ip, logflags);
5794

5795 5796
	return error;
}
5797 5798 5799 5800 5801 5802 5803 5804 5805 5806 5807 5808 5809 5810 5811 5812 5813 5814 5815 5816 5817 5818 5819 5820 5821 5822 5823 5824 5825 5826 5827 5828 5829 5830 5831 5832 5833 5834 5835 5836 5837 5838 5839 5840 5841 5842 5843 5844 5845 5846 5847 5848 5849 5850 5851 5852 5853 5854 5855 5856 5857 5858 5859 5860 5861 5862 5863 5864 5865 5866 5867 5868 5869 5870 5871 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 5907 5908 5909 5910 5911 5912 5913 5914 5915 5916 5917 5918 5919 5920 5921 5922 5923 5924 5925 5926 5927 5928 5929 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

/*
 * Splits an extent into two extents at split_fsb block such that it is
 * the first block of the current_ext. @current_ext is a target extent
 * to be split. @split_fsb is a block where the extents is split.
 * If split_fsb lies in a hole or the first block of extents, just return 0.
 */
STATIC int
xfs_bmap_split_extent_at(
	struct xfs_trans	*tp,
	struct xfs_inode	*ip,
	xfs_fileoff_t		split_fsb,
	xfs_fsblock_t		*firstfsb,
	struct xfs_bmap_free	*free_list)
{
	int				whichfork = XFS_DATA_FORK;
	struct xfs_btree_cur		*cur = NULL;
	struct xfs_bmbt_rec_host	*gotp;
	struct xfs_bmbt_irec		got;
	struct xfs_bmbt_irec		new; /* split extent */
	struct xfs_mount		*mp = ip->i_mount;
	struct xfs_ifork		*ifp;
	xfs_fsblock_t			gotblkcnt; /* new block count for got */
	xfs_extnum_t			current_ext;
	int				error = 0;
	int				logflags = 0;
	int				i = 0;

	if (unlikely(XFS_TEST_ERROR(
	    (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
	     XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE),
	     mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) {
		XFS_ERROR_REPORT("xfs_bmap_split_extent_at",
				 XFS_ERRLEVEL_LOW, mp);
		return -EFSCORRUPTED;
	}

	if (XFS_FORCED_SHUTDOWN(mp))
		return -EIO;

	ifp = XFS_IFORK_PTR(ip, whichfork);
	if (!(ifp->if_flags & XFS_IFEXTENTS)) {
		/* Read in all the extents */
		error = xfs_iread_extents(tp, ip, whichfork);
		if (error)
			return error;
	}

	/*
	 * gotp can be null in 2 cases: 1) if there are no extents
	 * or 2) split_fsb lies in a hole beyond which there are
	 * no extents. Either way, we are done.
	 */
	gotp = xfs_iext_bno_to_ext(ifp, split_fsb, &current_ext);
	if (!gotp)
		return 0;

	xfs_bmbt_get_all(gotp, &got);

	/*
	 * Check split_fsb lies in a hole or the start boundary offset
	 * of the extent.
	 */
	if (got.br_startoff >= split_fsb)
		return 0;

	gotblkcnt = split_fsb - got.br_startoff;
	new.br_startoff = split_fsb;
	new.br_startblock = got.br_startblock + gotblkcnt;
	new.br_blockcount = got.br_blockcount - gotblkcnt;
	new.br_state = got.br_state;

	if (ifp->if_flags & XFS_IFBROOT) {
		cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
		cur->bc_private.b.firstblock = *firstfsb;
		cur->bc_private.b.flist = free_list;
		cur->bc_private.b.flags = 0;
		error = xfs_bmbt_lookup_eq(cur, got.br_startoff,
				got.br_startblock,
				got.br_blockcount,
				&i);
		if (error)
			goto del_cursor;
		XFS_WANT_CORRUPTED_GOTO(mp, i == 1, del_cursor);
	}

	xfs_bmbt_set_blockcount(gotp, gotblkcnt);
	got.br_blockcount = gotblkcnt;

	logflags = XFS_ILOG_CORE;
	if (cur) {
		error = xfs_bmbt_update(cur, got.br_startoff,
				got.br_startblock,
				got.br_blockcount,
				got.br_state);
		if (error)
			goto del_cursor;
	} else
		logflags |= XFS_ILOG_DEXT;

	/* Add new extent */
	current_ext++;
	xfs_iext_insert(ip, current_ext, 1, &new, 0);
	XFS_IFORK_NEXT_SET(ip, whichfork,
			   XFS_IFORK_NEXTENTS(ip, whichfork) + 1);

	if (cur) {
		error = xfs_bmbt_lookup_eq(cur, new.br_startoff,
				new.br_startblock, new.br_blockcount,
				&i);
		if (error)
			goto del_cursor;
		XFS_WANT_CORRUPTED_GOTO(mp, i == 0, del_cursor);
		cur->bc_rec.b.br_state = new.br_state;

		error = xfs_btree_insert(cur, &i);
		if (error)
			goto del_cursor;
		XFS_WANT_CORRUPTED_GOTO(mp, i == 1, del_cursor);
	}

	/*
	 * Convert to a btree if necessary.
	 */
	if (xfs_bmap_needs_btree(ip, whichfork)) {
		int tmp_logflags; /* partial log flag return val */

		ASSERT(cur == NULL);
		error = xfs_bmap_extents_to_btree(tp, ip, firstfsb, free_list,
				&cur, 0, &tmp_logflags, whichfork);
		logflags |= tmp_logflags;
	}

del_cursor:
	if (cur) {
		cur->bc_private.b.allocated = 0;
		xfs_btree_del_cursor(cur,
				error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
	}

	if (logflags)
		xfs_trans_log_inode(tp, ip, logflags);
	return error;
}

int
xfs_bmap_split_extent(
	struct xfs_inode        *ip,
	xfs_fileoff_t           split_fsb)
{
	struct xfs_mount        *mp = ip->i_mount;
	struct xfs_trans        *tp;
	struct xfs_bmap_free    free_list;
	xfs_fsblock_t           firstfsb;
	int                     committed;
	int                     error;

	tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
	error = xfs_trans_reserve(tp, &M_RES(mp)->tr_write,
			XFS_DIOSTRAT_SPACE_RES(mp, 0), 0);
	if (error) {
5958
		xfs_trans_cancel(tp);
5959 5960 5961 5962 5963 5964 5965 5966 5967 5968 5969 5970 5971 5972 5973 5974 5975
		return error;
	}

	xfs_ilock(ip, XFS_ILOCK_EXCL);
	xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);

	xfs_bmap_init(&free_list, &firstfsb);

	error = xfs_bmap_split_extent_at(tp, ip, split_fsb,
			&firstfsb, &free_list);
	if (error)
		goto out;

	error = xfs_bmap_finish(&tp, &free_list, &committed);
	if (error)
		goto out;

5976
	return xfs_trans_commit(tp);
5977 5978

out:
5979
	xfs_bmap_cancel(&free_list);
5980
	xfs_trans_cancel(tp);
5981 5982
	return error;
}