xfs_inode.c 121.3 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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 */
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#include <linux/log2.h>

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#include "xfs.h"
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#include "xfs_fs.h"
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#include "xfs_types.h"
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#include "xfs_bit.h"
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#include "xfs_log.h"
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#include "xfs_inum.h"
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#include "xfs_trans.h"
#include "xfs_trans_priv.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_dir2.h"
#include "xfs_dmapi.h"
#include "xfs_mount.h"
#include "xfs_bmap_btree.h"
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#include "xfs_alloc_btree.h"
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#include "xfs_ialloc_btree.h"
#include "xfs_dir2_sf.h"
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#include "xfs_attr_sf.h"
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#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_buf_item.h"
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#include "xfs_inode_item.h"
#include "xfs_btree.h"
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#include "xfs_btree_trace.h"
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#include "xfs_alloc.h"
#include "xfs_ialloc.h"
#include "xfs_bmap.h"
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#include "xfs_rw.h"
#include "xfs_error.h"
#include "xfs_utils.h"
#include "xfs_quota.h"
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#include "xfs_filestream.h"
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#include "xfs_vnodeops.h"
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#include "xfs_trace.h"
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kmem_zone_t *xfs_ifork_zone;
kmem_zone_t *xfs_inode_zone;

/*
 * Used in xfs_itruncate().  This is the maximum number of extents
 * freed from a file in a single transaction.
 */
#define	XFS_ITRUNC_MAX_EXTENTS	2

STATIC int xfs_iflush_int(xfs_inode_t *, xfs_buf_t *);
STATIC int xfs_iformat_local(xfs_inode_t *, xfs_dinode_t *, int, int);
STATIC int xfs_iformat_extents(xfs_inode_t *, xfs_dinode_t *, int);
STATIC int xfs_iformat_btree(xfs_inode_t *, xfs_dinode_t *, int);

#ifdef DEBUG
/*
 * Make sure that the extents in the given memory buffer
 * are valid.
 */
STATIC void
xfs_validate_extents(
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	xfs_ifork_t		*ifp,
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	int			nrecs,
	xfs_exntfmt_t		fmt)
{
	xfs_bmbt_irec_t		irec;
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	xfs_bmbt_rec_host_t	rec;
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	int			i;

	for (i = 0; i < nrecs; i++) {
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		xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, i);
		rec.l0 = get_unaligned(&ep->l0);
		rec.l1 = get_unaligned(&ep->l1);
		xfs_bmbt_get_all(&rec, &irec);
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		if (fmt == XFS_EXTFMT_NOSTATE)
			ASSERT(irec.br_state == XFS_EXT_NORM);
	}
}
#else /* DEBUG */
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#define xfs_validate_extents(ifp, nrecs, fmt)
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#endif /* DEBUG */

/*
 * Check that none of the inode's in the buffer have a next
 * unlinked field of 0.
 */
#if defined(DEBUG)
void
xfs_inobp_check(
	xfs_mount_t	*mp,
	xfs_buf_t	*bp)
{
	int		i;
	int		j;
	xfs_dinode_t	*dip;

	j = mp->m_inode_cluster_size >> mp->m_sb.sb_inodelog;

	for (i = 0; i < j; i++) {
		dip = (xfs_dinode_t *)xfs_buf_offset(bp,
					i * mp->m_sb.sb_inodesize);
		if (!dip->di_next_unlinked)  {
			xfs_fs_cmn_err(CE_ALERT, mp,
				"Detected a bogus zero next_unlinked field in incore inode buffer 0x%p.  About to pop an ASSERT.",
				bp);
			ASSERT(dip->di_next_unlinked);
		}
	}
}
#endif

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/*
 * Find the buffer associated with the given inode map
 * We do basic validation checks on the buffer once it has been
 * retrieved from disk.
 */
STATIC int
xfs_imap_to_bp(
	xfs_mount_t	*mp,
	xfs_trans_t	*tp,
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	struct xfs_imap	*imap,
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	xfs_buf_t	**bpp,
	uint		buf_flags,
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	uint		iget_flags)
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{
	int		error;
	int		i;
	int		ni;
	xfs_buf_t	*bp;

	error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, imap->im_blkno,
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				   (int)imap->im_len, buf_flags, &bp);
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	if (error) {
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		if (error != EAGAIN) {
			cmn_err(CE_WARN,
				"xfs_imap_to_bp: xfs_trans_read_buf()returned "
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				"an error %d on %s.  Returning error.",
				error, mp->m_fsname);
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		} else {
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			ASSERT(buf_flags & XBF_TRYLOCK);
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		}
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		return error;
	}

	/*
	 * Validate the magic number and version of every inode in the buffer
	 * (if DEBUG kernel) or the first inode in the buffer, otherwise.
	 */
#ifdef DEBUG
	ni = BBTOB(imap->im_len) >> mp->m_sb.sb_inodelog;
#else	/* usual case */
	ni = 1;
#endif

	for (i = 0; i < ni; i++) {
		int		di_ok;
		xfs_dinode_t	*dip;

		dip = (xfs_dinode_t *)xfs_buf_offset(bp,
					(i << mp->m_sb.sb_inodelog));
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		di_ok = be16_to_cpu(dip->di_magic) == XFS_DINODE_MAGIC &&
			    XFS_DINODE_GOOD_VERSION(dip->di_version);
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		if (unlikely(XFS_TEST_ERROR(!di_ok, mp,
						XFS_ERRTAG_ITOBP_INOTOBP,
						XFS_RANDOM_ITOBP_INOTOBP))) {
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			if (iget_flags & XFS_IGET_BULKSTAT) {
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				xfs_trans_brelse(tp, bp);
				return XFS_ERROR(EINVAL);
			}
			XFS_CORRUPTION_ERROR("xfs_imap_to_bp",
						XFS_ERRLEVEL_HIGH, mp, dip);
#ifdef DEBUG
			cmn_err(CE_PANIC,
					"Device %s - bad inode magic/vsn "
					"daddr %lld #%d (magic=%x)",
				XFS_BUFTARG_NAME(mp->m_ddev_targp),
				(unsigned long long)imap->im_blkno, i,
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				be16_to_cpu(dip->di_magic));
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#endif
			xfs_trans_brelse(tp, bp);
			return XFS_ERROR(EFSCORRUPTED);
		}
	}

	xfs_inobp_check(mp, bp);

	/*
	 * Mark the buffer as an inode buffer now that it looks good
	 */
	XFS_BUF_SET_VTYPE(bp, B_FS_INO);

	*bpp = bp;
	return 0;
}

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/*
 * This routine is called to map an inode number within a file
 * system to the buffer containing the on-disk version of the
 * inode.  It returns a pointer to the buffer containing the
 * on-disk inode in the bpp parameter, and in the dip parameter
 * it returns a pointer to the on-disk inode within that buffer.
 *
 * If a non-zero error is returned, then the contents of bpp and
 * dipp are undefined.
 *
 * Use xfs_imap() to determine the size and location of the
 * buffer to read from disk.
 */
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int
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xfs_inotobp(
	xfs_mount_t	*mp,
	xfs_trans_t	*tp,
	xfs_ino_t	ino,
	xfs_dinode_t	**dipp,
	xfs_buf_t	**bpp,
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	int		*offset,
	uint		imap_flags)
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{
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	struct xfs_imap	imap;
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	xfs_buf_t	*bp;
	int		error;

	imap.im_blkno = 0;
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	error = xfs_imap(mp, tp, ino, &imap, imap_flags);
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	if (error)
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		return error;

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	error = xfs_imap_to_bp(mp, tp, &imap, &bp, XBF_LOCK, imap_flags);
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	if (error)
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		return error;

	*dipp = (xfs_dinode_t *)xfs_buf_offset(bp, imap.im_boffset);
	*bpp = bp;
	*offset = imap.im_boffset;
	return 0;
}


/*
 * This routine is called to map an inode to the buffer containing
 * the on-disk version of the inode.  It returns a pointer to the
 * buffer containing the on-disk inode in the bpp parameter, and in
 * the dip parameter it returns a pointer to the on-disk inode within
 * that buffer.
 *
 * If a non-zero error is returned, then the contents of bpp and
 * dipp are undefined.
 *
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 * The inode is expected to already been mapped to its buffer and read
 * in once, thus we can use the mapping information stored in the inode
 * rather than calling xfs_imap().  This allows us to avoid the overhead
 * of looking at the inode btree for small block file systems
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 * (see xfs_imap()).
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 */
int
xfs_itobp(
	xfs_mount_t	*mp,
	xfs_trans_t	*tp,
	xfs_inode_t	*ip,
	xfs_dinode_t	**dipp,
	xfs_buf_t	**bpp,
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	uint		buf_flags)
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{
	xfs_buf_t	*bp;
	int		error;

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	ASSERT(ip->i_imap.im_blkno != 0);
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	error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &bp, buf_flags, 0);
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	if (error)
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		return error;

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	if (!bp) {
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		ASSERT(buf_flags & XBF_TRYLOCK);
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		ASSERT(tp == NULL);
		*bpp = NULL;
		return EAGAIN;
	}

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	*dipp = (xfs_dinode_t *)xfs_buf_offset(bp, ip->i_imap.im_boffset);
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	*bpp = bp;
	return 0;
}

/*
 * Move inode type and inode format specific information from the
 * on-disk inode to the in-core inode.  For fifos, devs, and sockets
 * this means set if_rdev to the proper value.  For files, directories,
 * and symlinks this means to bring in the in-line data or extent
 * pointers.  For a file in B-tree format, only the root is immediately
 * brought in-core.  The rest will be in-lined in if_extents when it
 * is first referenced (see xfs_iread_extents()).
 */
STATIC int
xfs_iformat(
	xfs_inode_t		*ip,
	xfs_dinode_t		*dip)
{
	xfs_attr_shortform_t	*atp;
	int			size;
	int			error;
	xfs_fsize_t             di_size;
	ip->i_df.if_ext_max =
		XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t);
	error = 0;

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	if (unlikely(be32_to_cpu(dip->di_nextents) +
		     be16_to_cpu(dip->di_anextents) >
		     be64_to_cpu(dip->di_nblocks))) {
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		xfs_fs_repair_cmn_err(CE_WARN, ip->i_mount,
			"corrupt dinode %Lu, extent total = %d, nblocks = %Lu.",
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			(unsigned long long)ip->i_ino,
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			(int)(be32_to_cpu(dip->di_nextents) +
			      be16_to_cpu(dip->di_anextents)),
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			(unsigned long long)
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				be64_to_cpu(dip->di_nblocks));
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		XFS_CORRUPTION_ERROR("xfs_iformat(1)", XFS_ERRLEVEL_LOW,
				     ip->i_mount, dip);
		return XFS_ERROR(EFSCORRUPTED);
	}

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	if (unlikely(dip->di_forkoff > ip->i_mount->m_sb.sb_inodesize)) {
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		xfs_fs_repair_cmn_err(CE_WARN, ip->i_mount,
			"corrupt dinode %Lu, forkoff = 0x%x.",
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			(unsigned long long)ip->i_ino,
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			dip->di_forkoff);
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		XFS_CORRUPTION_ERROR("xfs_iformat(2)", XFS_ERRLEVEL_LOW,
				     ip->i_mount, dip);
		return XFS_ERROR(EFSCORRUPTED);
	}

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	if (unlikely((ip->i_d.di_flags & XFS_DIFLAG_REALTIME) &&
		     !ip->i_mount->m_rtdev_targp)) {
		xfs_fs_repair_cmn_err(CE_WARN, ip->i_mount,
			"corrupt dinode %Lu, has realtime flag set.",
			ip->i_ino);
		XFS_CORRUPTION_ERROR("xfs_iformat(realtime)",
				     XFS_ERRLEVEL_LOW, ip->i_mount, dip);
		return XFS_ERROR(EFSCORRUPTED);
	}

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	switch (ip->i_d.di_mode & S_IFMT) {
	case S_IFIFO:
	case S_IFCHR:
	case S_IFBLK:
	case S_IFSOCK:
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		if (unlikely(dip->di_format != XFS_DINODE_FMT_DEV)) {
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			XFS_CORRUPTION_ERROR("xfs_iformat(3)", XFS_ERRLEVEL_LOW,
					      ip->i_mount, dip);
			return XFS_ERROR(EFSCORRUPTED);
		}
		ip->i_d.di_size = 0;
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		ip->i_size = 0;
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		ip->i_df.if_u2.if_rdev = xfs_dinode_get_rdev(dip);
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		break;

	case S_IFREG:
	case S_IFLNK:
	case S_IFDIR:
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		switch (dip->di_format) {
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		case XFS_DINODE_FMT_LOCAL:
			/*
			 * no local regular files yet
			 */
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			if (unlikely((be16_to_cpu(dip->di_mode) & S_IFMT) == S_IFREG)) {
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				xfs_fs_repair_cmn_err(CE_WARN, ip->i_mount,
					"corrupt inode %Lu "
					"(local format for regular file).",
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					(unsigned long long) ip->i_ino);
				XFS_CORRUPTION_ERROR("xfs_iformat(4)",
						     XFS_ERRLEVEL_LOW,
						     ip->i_mount, dip);
				return XFS_ERROR(EFSCORRUPTED);
			}

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			di_size = be64_to_cpu(dip->di_size);
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			if (unlikely(di_size > XFS_DFORK_DSIZE(dip, ip->i_mount))) {
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				xfs_fs_repair_cmn_err(CE_WARN, ip->i_mount,
					"corrupt inode %Lu "
					"(bad size %Ld for local inode).",
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					(unsigned long long) ip->i_ino,
					(long long) di_size);
				XFS_CORRUPTION_ERROR("xfs_iformat(5)",
						     XFS_ERRLEVEL_LOW,
						     ip->i_mount, dip);
				return XFS_ERROR(EFSCORRUPTED);
			}

			size = (int)di_size;
			error = xfs_iformat_local(ip, dip, XFS_DATA_FORK, size);
			break;
		case XFS_DINODE_FMT_EXTENTS:
			error = xfs_iformat_extents(ip, dip, XFS_DATA_FORK);
			break;
		case XFS_DINODE_FMT_BTREE:
			error = xfs_iformat_btree(ip, dip, XFS_DATA_FORK);
			break;
		default:
			XFS_ERROR_REPORT("xfs_iformat(6)", XFS_ERRLEVEL_LOW,
					 ip->i_mount);
			return XFS_ERROR(EFSCORRUPTED);
		}
		break;

	default:
		XFS_ERROR_REPORT("xfs_iformat(7)", XFS_ERRLEVEL_LOW, ip->i_mount);
		return XFS_ERROR(EFSCORRUPTED);
	}
	if (error) {
		return error;
	}
	if (!XFS_DFORK_Q(dip))
		return 0;
	ASSERT(ip->i_afp == NULL);
	ip->i_afp = kmem_zone_zalloc(xfs_ifork_zone, KM_SLEEP);
	ip->i_afp->if_ext_max =
		XFS_IFORK_ASIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t);
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	switch (dip->di_aformat) {
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	case XFS_DINODE_FMT_LOCAL:
		atp = (xfs_attr_shortform_t *)XFS_DFORK_APTR(dip);
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		size = be16_to_cpu(atp->hdr.totsize);
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		if (unlikely(size < sizeof(struct xfs_attr_sf_hdr))) {
			xfs_fs_repair_cmn_err(CE_WARN, ip->i_mount,
				"corrupt inode %Lu "
				"(bad attr fork size %Ld).",
				(unsigned long long) ip->i_ino,
				(long long) size);
			XFS_CORRUPTION_ERROR("xfs_iformat(8)",
					     XFS_ERRLEVEL_LOW,
					     ip->i_mount, dip);
			return XFS_ERROR(EFSCORRUPTED);
		}

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		error = xfs_iformat_local(ip, dip, XFS_ATTR_FORK, size);
		break;
	case XFS_DINODE_FMT_EXTENTS:
		error = xfs_iformat_extents(ip, dip, XFS_ATTR_FORK);
		break;
	case XFS_DINODE_FMT_BTREE:
		error = xfs_iformat_btree(ip, dip, XFS_ATTR_FORK);
		break;
	default:
		error = XFS_ERROR(EFSCORRUPTED);
		break;
	}
	if (error) {
		kmem_zone_free(xfs_ifork_zone, ip->i_afp);
		ip->i_afp = NULL;
		xfs_idestroy_fork(ip, XFS_DATA_FORK);
	}
	return error;
}

/*
 * The file is in-lined in the on-disk inode.
 * If it fits into if_inline_data, then copy
 * it there, otherwise allocate a buffer for it
 * and copy the data there.  Either way, set
 * if_data to point at the data.
 * If we allocate a buffer for the data, make
 * sure that its size is a multiple of 4 and
 * record the real size in i_real_bytes.
 */
STATIC int
xfs_iformat_local(
	xfs_inode_t	*ip,
	xfs_dinode_t	*dip,
	int		whichfork,
	int		size)
{
	xfs_ifork_t	*ifp;
	int		real_size;

	/*
	 * If the size is unreasonable, then something
	 * is wrong and we just bail out rather than crash in
	 * kmem_alloc() or memcpy() below.
	 */
	if (unlikely(size > XFS_DFORK_SIZE(dip, ip->i_mount, whichfork))) {
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		xfs_fs_repair_cmn_err(CE_WARN, ip->i_mount,
			"corrupt inode %Lu "
			"(bad size %d for local fork, size = %d).",
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			(unsigned long long) ip->i_ino, size,
			XFS_DFORK_SIZE(dip, ip->i_mount, whichfork));
		XFS_CORRUPTION_ERROR("xfs_iformat_local", XFS_ERRLEVEL_LOW,
				     ip->i_mount, dip);
		return XFS_ERROR(EFSCORRUPTED);
	}
	ifp = XFS_IFORK_PTR(ip, whichfork);
	real_size = 0;
	if (size == 0)
		ifp->if_u1.if_data = NULL;
	else if (size <= sizeof(ifp->if_u2.if_inline_data))
		ifp->if_u1.if_data = ifp->if_u2.if_inline_data;
	else {
		real_size = roundup(size, 4);
		ifp->if_u1.if_data = kmem_alloc(real_size, KM_SLEEP);
	}
	ifp->if_bytes = size;
	ifp->if_real_bytes = real_size;
	if (size)
		memcpy(ifp->if_u1.if_data, XFS_DFORK_PTR(dip, whichfork), size);
	ifp->if_flags &= ~XFS_IFEXTENTS;
	ifp->if_flags |= XFS_IFINLINE;
	return 0;
}

/*
 * The file consists of a set of extents all
 * of which fit into the on-disk inode.
 * If there are few enough extents to fit into
 * the if_inline_ext, then copy them there.
 * Otherwise allocate a buffer for them and copy
 * them into it.  Either way, set if_extents
 * to point at the extents.
 */
STATIC int
xfs_iformat_extents(
	xfs_inode_t	*ip,
	xfs_dinode_t	*dip,
	int		whichfork)
{
538
	xfs_bmbt_rec_t	*dp;
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	xfs_ifork_t	*ifp;
	int		nex;
	int		size;
	int		i;

	ifp = XFS_IFORK_PTR(ip, whichfork);
	nex = XFS_DFORK_NEXTENTS(dip, whichfork);
	size = nex * (uint)sizeof(xfs_bmbt_rec_t);

	/*
	 * If the number of extents is unreasonable, then something
	 * is wrong and we just bail out rather than crash in
	 * kmem_alloc() or memcpy() below.
	 */
	if (unlikely(size < 0 || size > XFS_DFORK_SIZE(dip, ip->i_mount, whichfork))) {
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		xfs_fs_repair_cmn_err(CE_WARN, ip->i_mount,
			"corrupt inode %Lu ((a)extents = %d).",
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			(unsigned long long) ip->i_ino, nex);
		XFS_CORRUPTION_ERROR("xfs_iformat_extents(1)", XFS_ERRLEVEL_LOW,
				     ip->i_mount, dip);
		return XFS_ERROR(EFSCORRUPTED);
	}

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	ifp->if_real_bytes = 0;
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	if (nex == 0)
		ifp->if_u1.if_extents = NULL;
	else if (nex <= XFS_INLINE_EXTS)
		ifp->if_u1.if_extents = ifp->if_u2.if_inline_ext;
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	else
		xfs_iext_add(ifp, 0, nex);

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	ifp->if_bytes = size;
	if (size) {
		dp = (xfs_bmbt_rec_t *) XFS_DFORK_PTR(dip, whichfork);
573
		xfs_validate_extents(ifp, nex, XFS_EXTFMT_INODE(ip));
574
		for (i = 0; i < nex; i++, dp++) {
575
			xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, i);
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			ep->l0 = get_unaligned_be64(&dp->l0);
			ep->l1 = get_unaligned_be64(&dp->l1);
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		}
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		XFS_BMAP_TRACE_EXLIST(ip, nex, whichfork);
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		if (whichfork != XFS_DATA_FORK ||
			XFS_EXTFMT_INODE(ip) == XFS_EXTFMT_NOSTATE)
				if (unlikely(xfs_check_nostate_extents(
583
				    ifp, 0, nex))) {
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					XFS_ERROR_REPORT("xfs_iformat_extents(2)",
							 XFS_ERRLEVEL_LOW,
							 ip->i_mount);
					return XFS_ERROR(EFSCORRUPTED);
				}
	}
	ifp->if_flags |= XFS_IFEXTENTS;
	return 0;
}

/*
 * The file has too many extents to fit into
 * the inode, so they are in B-tree format.
 * Allocate a buffer for the root of the B-tree
 * and copy the root into it.  The i_extents
 * field will remain NULL until all of the
 * extents are read in (when they are needed).
 */
STATIC int
xfs_iformat_btree(
	xfs_inode_t		*ip,
	xfs_dinode_t		*dip,
	int			whichfork)
{
	xfs_bmdr_block_t	*dfp;
	xfs_ifork_t		*ifp;
	/* REFERENCED */
	int			nrecs;
	int			size;

	ifp = XFS_IFORK_PTR(ip, whichfork);
	dfp = (xfs_bmdr_block_t *)XFS_DFORK_PTR(dip, whichfork);
	size = XFS_BMAP_BROOT_SPACE(dfp);
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	nrecs = be16_to_cpu(dfp->bb_numrecs);
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	/*
	 * blow out if -- fork has less extents than can fit in
	 * fork (fork shouldn't be a btree format), root btree
	 * block has more records than can fit into the fork,
	 * or the number of extents is greater than the number of
	 * blocks.
	 */
	if (unlikely(XFS_IFORK_NEXTENTS(ip, whichfork) <= ifp->if_ext_max
	    || XFS_BMDR_SPACE_CALC(nrecs) >
			XFS_DFORK_SIZE(dip, ip->i_mount, whichfork)
	    || XFS_IFORK_NEXTENTS(ip, whichfork) > ip->i_d.di_nblocks)) {
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		xfs_fs_repair_cmn_err(CE_WARN, ip->i_mount,
			"corrupt inode %Lu (btree).",
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			(unsigned long long) ip->i_ino);
		XFS_ERROR_REPORT("xfs_iformat_btree", XFS_ERRLEVEL_LOW,
				 ip->i_mount);
		return XFS_ERROR(EFSCORRUPTED);
	}

	ifp->if_broot_bytes = size;
	ifp->if_broot = kmem_alloc(size, KM_SLEEP);
	ASSERT(ifp->if_broot != NULL);
	/*
	 * Copy and convert from the on-disk structure
	 * to the in-memory structure.
	 */
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	xfs_bmdr_to_bmbt(ip->i_mount, dfp,
			 XFS_DFORK_SIZE(dip, ip->i_mount, whichfork),
			 ifp->if_broot, size);
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	ifp->if_flags &= ~XFS_IFEXTENTS;
	ifp->if_flags |= XFS_IFBROOT;

	return 0;
}

654
STATIC void
655 656
xfs_dinode_from_disk(
	xfs_icdinode_t		*to,
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	xfs_dinode_t		*from)
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{
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	to->di_magic = be16_to_cpu(from->di_magic);
	to->di_mode = be16_to_cpu(from->di_mode);
	to->di_version = from ->di_version;
	to->di_format = from->di_format;
	to->di_onlink = be16_to_cpu(from->di_onlink);
	to->di_uid = be32_to_cpu(from->di_uid);
	to->di_gid = be32_to_cpu(from->di_gid);
	to->di_nlink = be32_to_cpu(from->di_nlink);
	to->di_projid = be16_to_cpu(from->di_projid);
	memcpy(to->di_pad, from->di_pad, sizeof(to->di_pad));
	to->di_flushiter = be16_to_cpu(from->di_flushiter);
	to->di_atime.t_sec = be32_to_cpu(from->di_atime.t_sec);
	to->di_atime.t_nsec = be32_to_cpu(from->di_atime.t_nsec);
	to->di_mtime.t_sec = be32_to_cpu(from->di_mtime.t_sec);
	to->di_mtime.t_nsec = be32_to_cpu(from->di_mtime.t_nsec);
	to->di_ctime.t_sec = be32_to_cpu(from->di_ctime.t_sec);
	to->di_ctime.t_nsec = be32_to_cpu(from->di_ctime.t_nsec);
	to->di_size = be64_to_cpu(from->di_size);
	to->di_nblocks = be64_to_cpu(from->di_nblocks);
	to->di_extsize = be32_to_cpu(from->di_extsize);
	to->di_nextents = be32_to_cpu(from->di_nextents);
	to->di_anextents = be16_to_cpu(from->di_anextents);
	to->di_forkoff = from->di_forkoff;
	to->di_aformat	= from->di_aformat;
	to->di_dmevmask	= be32_to_cpu(from->di_dmevmask);
	to->di_dmstate	= be16_to_cpu(from->di_dmstate);
	to->di_flags	= be16_to_cpu(from->di_flags);
	to->di_gen	= be32_to_cpu(from->di_gen);
}

void
xfs_dinode_to_disk(
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	xfs_dinode_t		*to,
692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721
	xfs_icdinode_t		*from)
{
	to->di_magic = cpu_to_be16(from->di_magic);
	to->di_mode = cpu_to_be16(from->di_mode);
	to->di_version = from ->di_version;
	to->di_format = from->di_format;
	to->di_onlink = cpu_to_be16(from->di_onlink);
	to->di_uid = cpu_to_be32(from->di_uid);
	to->di_gid = cpu_to_be32(from->di_gid);
	to->di_nlink = cpu_to_be32(from->di_nlink);
	to->di_projid = cpu_to_be16(from->di_projid);
	memcpy(to->di_pad, from->di_pad, sizeof(to->di_pad));
	to->di_flushiter = cpu_to_be16(from->di_flushiter);
	to->di_atime.t_sec = cpu_to_be32(from->di_atime.t_sec);
	to->di_atime.t_nsec = cpu_to_be32(from->di_atime.t_nsec);
	to->di_mtime.t_sec = cpu_to_be32(from->di_mtime.t_sec);
	to->di_mtime.t_nsec = cpu_to_be32(from->di_mtime.t_nsec);
	to->di_ctime.t_sec = cpu_to_be32(from->di_ctime.t_sec);
	to->di_ctime.t_nsec = cpu_to_be32(from->di_ctime.t_nsec);
	to->di_size = cpu_to_be64(from->di_size);
	to->di_nblocks = cpu_to_be64(from->di_nblocks);
	to->di_extsize = cpu_to_be32(from->di_extsize);
	to->di_nextents = cpu_to_be32(from->di_nextents);
	to->di_anextents = cpu_to_be16(from->di_anextents);
	to->di_forkoff = from->di_forkoff;
	to->di_aformat = from->di_aformat;
	to->di_dmevmask = cpu_to_be32(from->di_dmevmask);
	to->di_dmstate = cpu_to_be16(from->di_dmstate);
	to->di_flags = cpu_to_be16(from->di_flags);
	to->di_gen = cpu_to_be32(from->di_gen);
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}

STATIC uint
_xfs_dic2xflags(
	__uint16_t		di_flags)
{
	uint			flags = 0;

	if (di_flags & XFS_DIFLAG_ANY) {
		if (di_flags & XFS_DIFLAG_REALTIME)
			flags |= XFS_XFLAG_REALTIME;
		if (di_flags & XFS_DIFLAG_PREALLOC)
			flags |= XFS_XFLAG_PREALLOC;
		if (di_flags & XFS_DIFLAG_IMMUTABLE)
			flags |= XFS_XFLAG_IMMUTABLE;
		if (di_flags & XFS_DIFLAG_APPEND)
			flags |= XFS_XFLAG_APPEND;
		if (di_flags & XFS_DIFLAG_SYNC)
			flags |= XFS_XFLAG_SYNC;
		if (di_flags & XFS_DIFLAG_NOATIME)
			flags |= XFS_XFLAG_NOATIME;
		if (di_flags & XFS_DIFLAG_NODUMP)
			flags |= XFS_XFLAG_NODUMP;
		if (di_flags & XFS_DIFLAG_RTINHERIT)
			flags |= XFS_XFLAG_RTINHERIT;
		if (di_flags & XFS_DIFLAG_PROJINHERIT)
			flags |= XFS_XFLAG_PROJINHERIT;
		if (di_flags & XFS_DIFLAG_NOSYMLINKS)
			flags |= XFS_XFLAG_NOSYMLINKS;
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		if (di_flags & XFS_DIFLAG_EXTSIZE)
			flags |= XFS_XFLAG_EXTSIZE;
		if (di_flags & XFS_DIFLAG_EXTSZINHERIT)
			flags |= XFS_XFLAG_EXTSZINHERIT;
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		if (di_flags & XFS_DIFLAG_NODEFRAG)
			flags |= XFS_XFLAG_NODEFRAG;
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		if (di_flags & XFS_DIFLAG_FILESTREAM)
			flags |= XFS_XFLAG_FILESTREAM;
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	}

	return flags;
}

uint
xfs_ip2xflags(
	xfs_inode_t		*ip)
{
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	xfs_icdinode_t		*dic = &ip->i_d;
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	return _xfs_dic2xflags(dic->di_flags) |
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				(XFS_IFORK_Q(ip) ? XFS_XFLAG_HASATTR : 0);
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}

uint
xfs_dic2xflags(
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	xfs_dinode_t		*dip)
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{
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	return _xfs_dic2xflags(be16_to_cpu(dip->di_flags)) |
779
				(XFS_DFORK_Q(dip) ? XFS_XFLAG_HASATTR : 0);
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}

782
/*
783
 * Read the disk inode attributes into the in-core inode structure.
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 */
int
xfs_iread(
	xfs_mount_t	*mp,
	xfs_trans_t	*tp,
789
	xfs_inode_t	*ip,
790
	xfs_daddr_t	bno,
791
	uint		iget_flags)
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{
	xfs_buf_t	*bp;
	xfs_dinode_t	*dip;
	int		error;

	/*
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	 * Fill in the location information in the in-core inode.
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	 */
800
	ip->i_imap.im_blkno = bno;
801
	error = xfs_imap(mp, tp, ip->i_ino, &ip->i_imap, iget_flags);
802
	if (error)
803
		return error;
804
	ASSERT(bno == 0 || bno == ip->i_imap.im_blkno);
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	/*
807
	 * Get pointers to the on-disk inode and the buffer containing it.
808
	 */
809
	error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &bp,
810
			       XBF_LOCK, iget_flags);
811
	if (error)
812
		return error;
813
	dip = (xfs_dinode_t *)xfs_buf_offset(bp, ip->i_imap.im_boffset);
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	/*
	 * If we got something that isn't an inode it means someone
	 * (nfs or dmi) has a stale handle.
	 */
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	if (be16_to_cpu(dip->di_magic) != XFS_DINODE_MAGIC) {
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#ifdef DEBUG
		xfs_fs_cmn_err(CE_ALERT, mp, "xfs_iread: "
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				"dip->di_magic (0x%x) != "
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				"XFS_DINODE_MAGIC (0x%x)",
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				be16_to_cpu(dip->di_magic),
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				XFS_DINODE_MAGIC);
#endif /* DEBUG */
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		error = XFS_ERROR(EINVAL);
		goto out_brelse;
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	}

	/*
	 * If the on-disk inode is already linked to a directory
	 * entry, copy all of the inode into the in-core inode.
	 * xfs_iformat() handles copying in the inode format
	 * specific information.
	 * Otherwise, just get the truly permanent information.
	 */
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	if (dip->di_mode) {
		xfs_dinode_from_disk(&ip->i_d, dip);
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		error = xfs_iformat(ip, dip);
		if (error)  {
#ifdef DEBUG
			xfs_fs_cmn_err(CE_ALERT, mp, "xfs_iread: "
					"xfs_iformat() returned error %d",
					error);
#endif /* DEBUG */
847
			goto out_brelse;
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		}
	} else {
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		ip->i_d.di_magic = be16_to_cpu(dip->di_magic);
		ip->i_d.di_version = dip->di_version;
		ip->i_d.di_gen = be32_to_cpu(dip->di_gen);
		ip->i_d.di_flushiter = be16_to_cpu(dip->di_flushiter);
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		/*
		 * Make sure to pull in the mode here as well in
		 * case the inode is released without being used.
		 * This ensures that xfs_inactive() will see that
		 * the inode is already free and not try to mess
		 * with the uninitialized part of it.
		 */
		ip->i_d.di_mode = 0;
		/*
		 * Initialize the per-fork minima and maxima for a new
		 * inode here.  xfs_iformat will do it for old inodes.
		 */
		ip->i_df.if_ext_max =
			XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t);
	}

	/*
	 * The inode format changed when we moved the link count and
	 * made it 32 bits long.  If this is an old format inode,
	 * convert it in memory to look like a new one.  If it gets
	 * flushed to disk we will convert back before flushing or
	 * logging it.  We zero out the new projid field and the old link
	 * count field.  We'll handle clearing the pad field (the remains
	 * of the old uuid field) when we actually convert the inode to
	 * the new format. We don't change the version number so that we
	 * can distinguish this from a real new format inode.
	 */
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	if (ip->i_d.di_version == 1) {
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		ip->i_d.di_nlink = ip->i_d.di_onlink;
		ip->i_d.di_onlink = 0;
		ip->i_d.di_projid = 0;
	}

	ip->i_delayed_blks = 0;
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	ip->i_size = ip->i_d.di_size;
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	/*
	 * Mark the buffer containing the inode as something to keep
	 * around for a while.  This helps to keep recently accessed
	 * meta-data in-core longer.
	 */
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	XFS_BUF_SET_REF(bp, XFS_INO_REF);
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	/*
	 * Use xfs_trans_brelse() to release the buffer containing the
	 * on-disk inode, because it was acquired with xfs_trans_read_buf()
	 * in xfs_itobp() above.  If tp is NULL, this is just a normal
	 * brelse().  If we're within a transaction, then xfs_trans_brelse()
	 * will only release the buffer if it is not dirty within the
	 * transaction.  It will be OK to release the buffer in this case,
	 * because inodes on disk are never destroyed and we will be
	 * locking the new in-core inode before putting it in the hash
	 * table where other processes can find it.  Thus we don't have
	 * to worry about the inode being changed just because we released
	 * the buffer.
	 */
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 out_brelse:
	xfs_trans_brelse(tp, bp);
	return error;
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}

/*
 * Read in extents from a btree-format inode.
 * Allocate and fill in if_extents.  Real work is done in xfs_bmap.c.
 */
int
xfs_iread_extents(
	xfs_trans_t	*tp,
	xfs_inode_t	*ip,
	int		whichfork)
{
	int		error;
	xfs_ifork_t	*ifp;
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	xfs_extnum_t	nextents;
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	size_t		size;

	if (unlikely(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)) {
		XFS_ERROR_REPORT("xfs_iread_extents", XFS_ERRLEVEL_LOW,
				 ip->i_mount);
		return XFS_ERROR(EFSCORRUPTED);
	}
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	nextents = XFS_IFORK_NEXTENTS(ip, whichfork);
	size = nextents * sizeof(xfs_bmbt_rec_t);
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	ifp = XFS_IFORK_PTR(ip, whichfork);
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	/*
	 * We know that the size is valid (it's checked in iformat_btree)
	 */
	ifp->if_lastex = NULLEXTNUM;
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	ifp->if_bytes = ifp->if_real_bytes = 0;
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	ifp->if_flags |= XFS_IFEXTENTS;
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	xfs_iext_add(ifp, 0, nextents);
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	error = xfs_bmap_read_extents(tp, ip, whichfork);
	if (error) {
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		xfs_iext_destroy(ifp);
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		ifp->if_flags &= ~XFS_IFEXTENTS;
		return error;
	}
952
	xfs_validate_extents(ifp, nextents, XFS_EXTFMT_INODE(ip));
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	return 0;
}

/*
 * Allocate an inode on disk and return a copy of its in-core version.
 * The in-core inode is locked exclusively.  Set mode, nlink, and rdev
 * appropriately within the inode.  The uid and gid for the inode are
 * set according to the contents of the given cred structure.
 *
 * Use xfs_dialloc() to allocate the on-disk inode. If xfs_dialloc()
 * has a free inode available, call xfs_iget()
 * to obtain the in-core version of the allocated inode.  Finally,
 * fill in the inode and log its initial contents.  In this case,
 * ialloc_context would be set to NULL and call_again set to false.
 *
 * If xfs_dialloc() does not have an available inode,
 * it will replenish its supply by doing an allocation. Since we can
 * only do one allocation within a transaction without deadlocks, we
 * must commit the current transaction before returning the inode itself.
 * In this case, therefore, we will set call_again to true and return.
 * The caller should then commit the current transaction, start a new
 * transaction, and call xfs_ialloc() again to actually get the inode.
 *
 * To ensure that some other process does not grab the inode that
 * was allocated during the first call to xfs_ialloc(), this routine
 * also returns the [locked] bp pointing to the head of the freelist
 * as ialloc_context.  The caller should hold this buffer across
 * the commit and pass it back into this routine on the second call.
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 *
 * If we are allocating quota inodes, we do not have a parent inode
 * to attach to or associate with (i.e. pip == NULL) because they
 * are not linked into the directory structure - they are attached
 * directly to the superblock - and so have no parent.
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 */
int
xfs_ialloc(
	xfs_trans_t	*tp,
	xfs_inode_t	*pip,
	mode_t		mode,
992
	xfs_nlink_t	nlink,
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	xfs_dev_t	rdev,
	cred_t		*cr,
	xfs_prid_t	prid,
	int		okalloc,
	xfs_buf_t	**ialloc_context,
	boolean_t	*call_again,
	xfs_inode_t	**ipp)
{
	xfs_ino_t	ino;
	xfs_inode_t	*ip;
	uint		flags;
	int		error;
1005
	timespec_t	tv;
1006
	int		filestreams = 0;
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	/*
	 * Call the space management code to pick
	 * the on-disk inode to be allocated.
	 */
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	error = xfs_dialloc(tp, pip ? pip->i_ino : 0, mode, okalloc,
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			    ialloc_context, call_again, &ino);
1014
	if (error)
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		return error;
	if (*call_again || ino == NULLFSINO) {
		*ipp = NULL;
		return 0;
	}
	ASSERT(*ialloc_context == NULL);

	/*
	 * Get the in-core inode with the lock held exclusively.
	 * This is because we're setting fields here we need
	 * to prevent others from looking at until we're done.
	 */
	error = xfs_trans_iget(tp->t_mountp, tp, ino,
1028
				XFS_IGET_CREATE, XFS_ILOCK_EXCL, &ip);
1029
	if (error)
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		return error;
	ASSERT(ip != NULL);

	ip->i_d.di_mode = (__uint16_t)mode;
	ip->i_d.di_onlink = 0;
	ip->i_d.di_nlink = nlink;
	ASSERT(ip->i_d.di_nlink == nlink);
1037 1038
	ip->i_d.di_uid = current_fsuid();
	ip->i_d.di_gid = current_fsgid();
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	ip->i_d.di_projid = prid;
	memset(&(ip->i_d.di_pad[0]), 0, sizeof(ip->i_d.di_pad));

	/*
	 * If the superblock version is up to where we support new format
	 * inodes and this is currently an old format inode, then change
	 * the inode version number now.  This way we only do the conversion
	 * here rather than here and in the flush/logging code.
	 */
1048
	if (xfs_sb_version_hasnlink(&tp->t_mountp->m_sb) &&
1049 1050
	    ip->i_d.di_version == 1) {
		ip->i_d.di_version = 2;
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		/*
		 * We've already zeroed the old link count, the projid field,
		 * and the pad field.
		 */
	}

	/*
	 * Project ids won't be stored on disk if we are using a version 1 inode.
	 */
1060
	if ((prid != 0) && (ip->i_d.di_version == 1))
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		xfs_bump_ino_vers2(tp, ip);

1063
	if (pip && XFS_INHERIT_GID(pip)) {
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		ip->i_d.di_gid = pip->i_d.di_gid;
		if ((pip->i_d.di_mode & S_ISGID) && (mode & S_IFMT) == S_IFDIR) {
			ip->i_d.di_mode |= S_ISGID;
		}
	}

	/*
	 * If the group ID of the new file does not match the effective group
	 * ID or one of the supplementary group IDs, the S_ISGID bit is cleared
	 * (and only if the irix_sgid_inherit compatibility variable is set).
	 */
	if ((irix_sgid_inherit) &&
	    (ip->i_d.di_mode & S_ISGID) &&
	    (!in_group_p((gid_t)ip->i_d.di_gid))) {
		ip->i_d.di_mode &= ~S_ISGID;
	}

	ip->i_d.di_size = 0;
1082
	ip->i_size = 0;
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	ip->i_d.di_nextents = 0;
	ASSERT(ip->i_d.di_nblocks == 0);
1085 1086 1087 1088 1089 1090 1091

	nanotime(&tv);
	ip->i_d.di_mtime.t_sec = (__int32_t)tv.tv_sec;
	ip->i_d.di_mtime.t_nsec = (__int32_t)tv.tv_nsec;
	ip->i_d.di_atime = ip->i_d.di_mtime;
	ip->i_d.di_ctime = ip->i_d.di_mtime;

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	/*
	 * di_gen will have been taken care of in xfs_iread.
	 */
	ip->i_d.di_extsize = 0;
	ip->i_d.di_dmevmask = 0;
	ip->i_d.di_dmstate = 0;
	ip->i_d.di_flags = 0;
	flags = XFS_ILOG_CORE;
	switch (mode & S_IFMT) {
	case S_IFIFO:
	case S_IFCHR:
	case S_IFBLK:
	case S_IFSOCK:
		ip->i_d.di_format = XFS_DINODE_FMT_DEV;
		ip->i_df.if_u2.if_rdev = rdev;
		ip->i_df.if_flags = 0;
		flags |= XFS_ILOG_DEV;
		break;
	case S_IFREG:
1111 1112 1113 1114 1115 1116
		/*
		 * we can't set up filestreams until after the VFS inode
		 * is set up properly.
		 */
		if (pip && xfs_inode_is_filestream(pip))
			filestreams = 1;
1117
		/* fall through */
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	case S_IFDIR:
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		if (pip && (pip->i_d.di_flags & XFS_DIFLAG_ANY)) {
1120 1121 1122 1123 1124
			uint	di_flags = 0;

			if ((mode & S_IFMT) == S_IFDIR) {
				if (pip->i_d.di_flags & XFS_DIFLAG_RTINHERIT)
					di_flags |= XFS_DIFLAG_RTINHERIT;
1125 1126 1127 1128 1129
				if (pip->i_d.di_flags & XFS_DIFLAG_EXTSZINHERIT) {
					di_flags |= XFS_DIFLAG_EXTSZINHERIT;
					ip->i_d.di_extsize = pip->i_d.di_extsize;
				}
			} else if ((mode & S_IFMT) == S_IFREG) {
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				if (pip->i_d.di_flags & XFS_DIFLAG_RTINHERIT)
1131
					di_flags |= XFS_DIFLAG_REALTIME;
1132 1133 1134 1135
				if (pip->i_d.di_flags & XFS_DIFLAG_EXTSZINHERIT) {
					di_flags |= XFS_DIFLAG_EXTSIZE;
					ip->i_d.di_extsize = pip->i_d.di_extsize;
				}
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			}
			if ((pip->i_d.di_flags & XFS_DIFLAG_NOATIME) &&
			    xfs_inherit_noatime)
1139
				di_flags |= XFS_DIFLAG_NOATIME;
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			if ((pip->i_d.di_flags & XFS_DIFLAG_NODUMP) &&
			    xfs_inherit_nodump)
1142
				di_flags |= XFS_DIFLAG_NODUMP;
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			if ((pip->i_d.di_flags & XFS_DIFLAG_SYNC) &&
			    xfs_inherit_sync)
1145
				di_flags |= XFS_DIFLAG_SYNC;
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			if ((pip->i_d.di_flags & XFS_DIFLAG_NOSYMLINKS) &&
			    xfs_inherit_nosymlinks)
1148 1149 1150
				di_flags |= XFS_DIFLAG_NOSYMLINKS;
			if (pip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
				di_flags |= XFS_DIFLAG_PROJINHERIT;
1151 1152 1153
			if ((pip->i_d.di_flags & XFS_DIFLAG_NODEFRAG) &&
			    xfs_inherit_nodefrag)
				di_flags |= XFS_DIFLAG_NODEFRAG;
1154 1155
			if (pip->i_d.di_flags & XFS_DIFLAG_FILESTREAM)
				di_flags |= XFS_DIFLAG_FILESTREAM;
1156
			ip->i_d.di_flags |= di_flags;
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		}
		/* FALLTHROUGH */
	case S_IFLNK:
		ip->i_d.di_format = XFS_DINODE_FMT_EXTENTS;
		ip->i_df.if_flags = XFS_IFEXTENTS;
		ip->i_df.if_bytes = ip->i_df.if_real_bytes = 0;
		ip->i_df.if_u1.if_extents = NULL;
		break;
	default:
		ASSERT(0);
	}
	/*
	 * Attribute fork settings for new inode.
	 */
	ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS;
	ip->i_d.di_anextents = 0;

	/*
	 * Log the new values stuffed into the inode.
	 */
	xfs_trans_log_inode(tp, ip, flags);

1179
	/* now that we have an i_mode we can setup inode ops and unlock */
1180
	xfs_setup_inode(ip);
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	/* now we have set up the vfs inode we can associate the filestream */
	if (filestreams) {
		error = xfs_filestream_associate(pip, ip);
		if (error < 0)
			return -error;
		if (!error)
			xfs_iflags_set(ip, XFS_IFILESTREAM);
	}

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	*ipp = ip;
	return 0;
}

/*
 * Check to make sure that there are no blocks allocated to the
 * file beyond the size of the file.  We don't check this for
 * files with fixed size extents or real time extents, but we
 * at least do it for regular files.
 */
#ifdef DEBUG
void
xfs_isize_check(
	xfs_mount_t	*mp,
	xfs_inode_t	*ip,
	xfs_fsize_t	isize)
{
	xfs_fileoff_t	map_first;
	int		nimaps;
	xfs_bmbt_irec_t	imaps[2];

	if ((ip->i_d.di_mode & S_IFMT) != S_IFREG)
		return;

1215 1216 1217 1218
	if (XFS_IS_REALTIME_INODE(ip))
		return;

	if (ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE)
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		return;

	nimaps = 2;
	map_first = XFS_B_TO_FSB(mp, (xfs_ufsize_t)isize);
	/*
	 * The filesystem could be shutting down, so bmapi may return
	 * an error.
	 */
	if (xfs_bmapi(NULL, ip, map_first,
			 (XFS_B_TO_FSB(mp,
				       (xfs_ufsize_t)XFS_MAXIOFFSET(mp)) -
			  map_first),
			 XFS_BMAPI_ENTIRE, NULL, 0, imaps, &nimaps,
1232
			 NULL, NULL))
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	    return;
	ASSERT(nimaps == 1);
	ASSERT(imaps[0].br_startblock == HOLESTARTBLOCK);
}
#endif	/* DEBUG */

/*
 * Calculate the last possible buffered byte in a file.  This must
 * include data that was buffered beyond the EOF by the write code.
 * This also needs to deal with overflowing the xfs_fsize_t type
 * which can happen for sizes near the limit.
 *
 * We also need to take into account any blocks beyond the EOF.  It
 * may be the case that they were buffered by a write which failed.
 * In that case the pages will still be in memory, but the inode size
 * will never have been updated.
 */
1250
STATIC xfs_fsize_t
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xfs_file_last_byte(
	xfs_inode_t	*ip)
{
	xfs_mount_t	*mp;
	xfs_fsize_t	last_byte;
	xfs_fileoff_t	last_block;
	xfs_fileoff_t	size_last_block;
	int		error;

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	ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL|XFS_IOLOCK_SHARED));
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	mp = ip->i_mount;
	/*
	 * Only check for blocks beyond the EOF if the extents have
	 * been read in.  This eliminates the need for the inode lock,
	 * and it also saves us from looking when it really isn't
	 * necessary.
	 */
	if (ip->i_df.if_flags & XFS_IFEXTENTS) {
1270
		xfs_ilock(ip, XFS_ILOCK_SHARED);
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		error = xfs_bmap_last_offset(NULL, ip, &last_block,
			XFS_DATA_FORK);
1273
		xfs_iunlock(ip, XFS_ILOCK_SHARED);
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		if (error) {
			last_block = 0;
		}
	} else {
		last_block = 0;
	}
1280
	size_last_block = XFS_B_TO_FSB(mp, (xfs_ufsize_t)ip->i_size);
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	last_block = XFS_FILEOFF_MAX(last_block, size_last_block);

	last_byte = XFS_FSB_TO_B(mp, last_block);
	if (last_byte < 0) {
		return XFS_MAXIOFFSET(mp);
	}
	last_byte += (1 << mp->m_writeio_log);
	if (last_byte < 0) {
		return XFS_MAXIOFFSET(mp);
	}
	return last_byte;
}

/*
 * Start the truncation of the file to new_size.  The new size
 * must be smaller than the current size.  This routine will
 * clear the buffer and page caches of file data in the removed
 * range, and xfs_itruncate_finish() will remove the underlying
 * disk blocks.
 *
 * The inode must have its I/O lock locked EXCLUSIVELY, and it
 * must NOT have the inode lock held at all.  This is because we're
 * calling into the buffer/page cache code and we can't hold the
 * inode lock when we do so.
 *
1306 1307 1308 1309 1310 1311 1312
 * We need to wait for any direct I/Os in flight to complete before we
 * proceed with the truncate. This is needed to prevent the extents
 * being read or written by the direct I/Os from being removed while the
 * I/O is in flight as there is no other method of synchronising
 * direct I/O with the truncate operation.  Also, because we hold
 * the IOLOCK in exclusive mode, we prevent new direct I/Os from being
 * started until the truncate completes and drops the lock. Essentially,
1313 1314
 * the xfs_ioend_wait() call forms an I/O barrier that provides strict
 * ordering between direct I/Os and the truncate operation.
1315
 *
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 * The flags parameter can have either the value XFS_ITRUNC_DEFINITE
 * or XFS_ITRUNC_MAYBE.  The XFS_ITRUNC_MAYBE value should be used
 * in the case that the caller is locking things out of order and
 * may not be able to call xfs_itruncate_finish() with the inode lock
 * held without dropping the I/O lock.  If the caller must drop the
 * I/O lock before calling xfs_itruncate_finish(), then xfs_itruncate_start()
 * must be called again with all the same restrictions as the initial
 * call.
 */
1325
int
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xfs_itruncate_start(
	xfs_inode_t	*ip,
	uint		flags,
	xfs_fsize_t	new_size)
{
	xfs_fsize_t	last_byte;
	xfs_off_t	toss_start;
	xfs_mount_t	*mp;
1334
	int		error = 0;
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C
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	ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
1337
	ASSERT((new_size == 0) || (new_size <= ip->i_size));
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	ASSERT((flags == XFS_ITRUNC_DEFINITE) ||
	       (flags == XFS_ITRUNC_MAYBE));

	mp = ip->i_mount;
1342

1343
	/* wait for the completion of any pending DIOs */
1344
	if (new_size == 0 || new_size < ip->i_size)
1345
		xfs_ioend_wait(ip);
1346

L
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1347
	/*
1348
	 * Call toss_pages or flushinval_pages to get rid of pages
L
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1349
	 * overlapping the region being removed.  We have to use
1350
	 * the less efficient flushinval_pages in the case that the
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	 * caller may not be able to finish the truncate without
	 * dropping the inode's I/O lock.  Make sure
	 * to catch any pages brought in by buffers overlapping
	 * the EOF by searching out beyond the isize by our
	 * block size. We round new_size up to a block boundary
	 * so that we don't toss things on the same block as
	 * new_size but before it.
	 *
1359
	 * Before calling toss_page or flushinval_pages, make sure to
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	 * call remapf() over the same region if the file is mapped.
	 * This frees up mapped file references to the pages in the
1362
	 * given range and for the flushinval_pages case it ensures
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	 * that we get the latest mapped changes flushed out.
	 */
	toss_start = XFS_B_TO_FSB(mp, (xfs_ufsize_t)new_size);
	toss_start = XFS_FSB_TO_B(mp, toss_start);
	if (toss_start < 0) {
		/*
		 * The place to start tossing is beyond our maximum
		 * file size, so there is no way that the data extended
		 * out there.
		 */
1373
		return 0;
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	}
	last_byte = xfs_file_last_byte(ip);
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	trace_xfs_itruncate_start(ip, flags, new_size, toss_start, last_byte);
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	if (last_byte > toss_start) {
		if (flags & XFS_ITRUNC_DEFINITE) {
1379 1380
			xfs_tosspages(ip, toss_start,
					-1, FI_REMAPF_LOCKED);
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		} else {
1382 1383
			error = xfs_flushinval_pages(ip, toss_start,
					-1, FI_REMAPF_LOCKED);
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		}
	}

#ifdef DEBUG
	if (new_size == 0) {
1389
		ASSERT(VN_CACHED(VFS_I(ip)) == 0);
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	}
#endif
1392
	return error;
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}

/*
1396 1397 1398
 * Shrink the file to the given new_size.  The new size must be smaller than
 * the current size.  This will free up the underlying blocks in the removed
 * range after a call to xfs_itruncate_start() or xfs_atruncate_start().
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 *
1400 1401 1402 1403 1404 1405 1406 1407 1408
 * The transaction passed to this routine must have made a permanent log
 * reservation of at least XFS_ITRUNCATE_LOG_RES.  This routine may commit the
 * given transaction and start new ones, so make sure everything involved in
 * the transaction is tidy before calling here.  Some transaction will be
 * returned to the caller to be committed.  The incoming transaction must
 * already include the inode, and both inode locks must be held exclusively.
 * The inode must also be "held" within the transaction.  On return the inode
 * will be "held" within the returned transaction.  This routine does NOT
 * require any disk space to be reserved for it within the transaction.
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 *
1410 1411 1412
 * The fork parameter must be either xfs_attr_fork or xfs_data_fork, and it
 * indicates the fork which is to be truncated.  For the attribute fork we only
 * support truncation to size 0.
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 *
1414 1415 1416 1417 1418
 * We use the sync parameter to indicate whether or not the first transaction
 * we perform might have to be synchronous.  For the attr fork, it needs to be
 * so if the unlink of the inode is not yet known to be permanent in the log.
 * This keeps us from freeing and reusing the blocks of the attribute fork
 * before the unlink of the inode becomes permanent.
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 *
1420 1421 1422 1423 1424 1425 1426
 * For the data fork, we normally have to run synchronously if we're being
 * called out of the inactive path or we're being called out of the create path
 * where we're truncating an existing file.  Either way, the truncate needs to
 * be sync so blocks don't reappear in the file with altered data in case of a
 * crash.  wsync filesystems can run the first case async because anything that
 * shrinks the inode has to run sync so by the time we're called here from
 * inactive, the inode size is permanently set to 0.
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 *
1428 1429
 * Calls from the truncate path always need to be sync unless we're in a wsync
 * filesystem and the file has already been unlinked.
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 *
1431 1432 1433 1434 1435 1436 1437 1438 1439
 * The caller is responsible for correctly setting the sync parameter.  It gets
 * too hard for us to guess here which path we're being called out of just
 * based on inode state.
 *
 * If we get an error, we must return with the inode locked and linked into the
 * current transaction. This keeps things simple for the higher level code,
 * because it always knows that the inode is locked and held in the transaction
 * that returns to it whether errors occur or not.  We don't mark the inode
 * dirty on error so that transactions can be easily aborted if possible.
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 */
int
xfs_itruncate_finish(
	xfs_trans_t	**tp,
	xfs_inode_t	*ip,
	xfs_fsize_t	new_size,
	int		fork,
	int		sync)
{
	xfs_fsblock_t	first_block;
	xfs_fileoff_t	first_unmap_block;
	xfs_fileoff_t	last_block;
	xfs_filblks_t	unmap_len=0;
	xfs_mount_t	*mp;
	xfs_trans_t	*ntp;
	int		done;
	int		committed;
	xfs_bmap_free_t	free_list;
	int		error;

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	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL));
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	ASSERT((new_size == 0) || (new_size <= ip->i_size));
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	ASSERT(*tp != NULL);
	ASSERT((*tp)->t_flags & XFS_TRANS_PERM_LOG_RES);
	ASSERT(ip->i_transp == *tp);
	ASSERT(ip->i_itemp != NULL);
	ASSERT(ip->i_itemp->ili_flags & XFS_ILI_HOLD);


	ntp = *tp;
	mp = (ntp)->t_mountp;
	ASSERT(! XFS_NOT_DQATTACHED(mp, ip));

	/*
	 * We only support truncating the entire attribute fork.
	 */
	if (fork == XFS_ATTR_FORK) {
		new_size = 0LL;
	}
	first_unmap_block = XFS_B_TO_FSB(mp, (xfs_ufsize_t)new_size);
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	trace_xfs_itruncate_finish_start(ip, new_size);

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	/*
	 * The first thing we do is set the size to new_size permanently
	 * on disk.  This way we don't have to worry about anyone ever
	 * being able to look at the data being freed even in the face
	 * of a crash.  What we're getting around here is the case where
	 * we free a block, it is allocated to another file, it is written
	 * to, and then we crash.  If the new data gets written to the
	 * file but the log buffers containing the free and reallocation
	 * don't, then we'd end up with garbage in the blocks being freed.
	 * As long as we make the new_size permanent before actually
	 * freeing any blocks it doesn't matter if they get writtten to.
	 *
	 * The callers must signal into us whether or not the size
	 * setting here must be synchronous.  There are a few cases
	 * where it doesn't have to be synchronous.  Those cases
	 * occur if the file is unlinked and we know the unlink is
	 * permanent or if the blocks being truncated are guaranteed
	 * to be beyond the inode eof (regardless of the link count)
	 * and the eof value is permanent.  Both of these cases occur
	 * only on wsync-mounted filesystems.  In those cases, we're
	 * guaranteed that no user will ever see the data in the blocks
	 * that are being truncated so the truncate can run async.
	 * In the free beyond eof case, the file may wind up with
	 * more blocks allocated to it than it needs if we crash
	 * and that won't get fixed until the next time the file
	 * is re-opened and closed but that's ok as that shouldn't
	 * be too many blocks.
	 *
	 * However, we can't just make all wsync xactions run async
	 * because there's one call out of the create path that needs
	 * to run sync where it's truncating an existing file to size
	 * 0 whose size is > 0.
	 *
	 * It's probably possible to come up with a test in this
	 * routine that would correctly distinguish all the above
	 * cases from the values of the function parameters and the
	 * inode state but for sanity's sake, I've decided to let the
	 * layers above just tell us.  It's simpler to correctly figure
	 * out in the layer above exactly under what conditions we
	 * can run async and I think it's easier for others read and
	 * follow the logic in case something has to be changed.
	 * cscope is your friend -- rcc.
	 *
	 * The attribute fork is much simpler.
	 *
	 * For the attribute fork we allow the caller to tell us whether
	 * the unlink of the inode that led to this call is yet permanent
	 * in the on disk log.  If it is not and we will be freeing extents
	 * in this inode then we make the first transaction synchronous
	 * to make sure that the unlink is permanent by the time we free
	 * the blocks.
	 */
	if (fork == XFS_DATA_FORK) {
		if (ip->i_d.di_nextents > 0) {
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			/*
			 * If we are not changing the file size then do
			 * not update the on-disk file size - we may be
			 * called from xfs_inactive_free_eofblocks().  If we
			 * update the on-disk file size and then the system
			 * crashes before the contents of the file are
			 * flushed to disk then the files may be full of
			 * holes (ie NULL files bug).
			 */
			if (ip->i_size != new_size) {
				ip->i_d.di_size = new_size;
				ip->i_size = new_size;
				xfs_trans_log_inode(ntp, ip, XFS_ILOG_CORE);
			}
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		}
	} else if (sync) {
		ASSERT(!(mp->m_flags & XFS_MOUNT_WSYNC));
		if (ip->i_d.di_anextents > 0)
			xfs_trans_set_sync(ntp);
	}
	ASSERT(fork == XFS_DATA_FORK ||
		(fork == XFS_ATTR_FORK &&
			((sync && !(mp->m_flags & XFS_MOUNT_WSYNC)) ||
			 (sync == 0 && (mp->m_flags & XFS_MOUNT_WSYNC)))));

	/*
	 * Since it is possible for space to become allocated beyond
	 * the end of the file (in a crash where the space is allocated
	 * but the inode size is not yet updated), simply remove any
	 * blocks which show up between the new EOF and the maximum
	 * possible file size.  If the first block to be removed is
	 * beyond the maximum file size (ie it is the same as last_block),
	 * then there is nothing to do.
	 */
	last_block = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp));
	ASSERT(first_unmap_block <= last_block);
	done = 0;
	if (last_block == first_unmap_block) {
		done = 1;
	} else {
		unmap_len = last_block - first_unmap_block + 1;
	}
	while (!done) {
		/*
		 * Free up up to XFS_ITRUNC_MAX_EXTENTS.  xfs_bunmapi()
		 * will tell us whether it freed the entire range or
		 * not.  If this is a synchronous mount (wsync),
		 * then we can tell bunmapi to keep all the
		 * transactions asynchronous since the unlink
		 * transaction that made this inode inactive has
		 * already hit the disk.  There's no danger of
		 * the freed blocks being reused, there being a
		 * crash, and the reused blocks suddenly reappearing
		 * in this file with garbage in them once recovery
		 * runs.
		 */
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		xfs_bmap_init(&free_list, &first_block);
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		error = xfs_bunmapi(ntp, ip,
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				    first_unmap_block, unmap_len,
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				    xfs_bmapi_aflag(fork) |
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				      (sync ? 0 : XFS_BMAPI_ASYNC),
				    XFS_ITRUNC_MAX_EXTENTS,
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				    &first_block, &free_list,
				    NULL, &done);
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		if (error) {
			/*
			 * If the bunmapi call encounters an error,
			 * return to the caller where the transaction
			 * can be properly aborted.  We just need to
			 * make sure we're not holding any resources
			 * that we were not when we came in.
			 */
			xfs_bmap_cancel(&free_list);
			return error;
		}

		/*
		 * Duplicate the transaction that has the permanent
		 * reservation and commit the old transaction.
		 */
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		error = xfs_bmap_finish(tp, &free_list, &committed);
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		ntp = *tp;
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		if (committed) {
			/* link the inode into the next xact in the chain */
			xfs_trans_ijoin(ntp, ip,
					XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
			xfs_trans_ihold(ntp, ip);
		}

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		if (error) {
			/*
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			 * If the bmap finish call encounters an error, return
			 * to the caller where the transaction can be properly
			 * aborted.  We just need to make sure we're not
			 * holding any resources that we were not when we came
			 * in.
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			 *
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			 * Aborting from this point might lose some blocks in
			 * the file system, but oh well.
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			 */
			xfs_bmap_cancel(&free_list);
			return error;
		}

		if (committed) {
			/*
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			 * Mark the inode dirty so it will be logged and
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			 * moved forward in the log as part of every commit.
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			 */
			xfs_trans_log_inode(ntp, ip, XFS_ILOG_CORE);
		}
1647

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		ntp = xfs_trans_dup(ntp);
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		error = xfs_trans_commit(*tp, 0);
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		*tp = ntp;
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		/* link the inode into the next transaction in the chain */
		xfs_trans_ijoin(ntp, ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
		xfs_trans_ihold(ntp, ip);

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		if (error)
			return error;
		/*
		 * transaction commit worked ok so we can drop the extra ticket
		 * reference that we gained in xfs_trans_dup()
		 */
		xfs_log_ticket_put(ntp->t_ticket);
		error = xfs_trans_reserve(ntp, 0,
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					XFS_ITRUNCATE_LOG_RES(mp), 0,
					XFS_TRANS_PERM_LOG_RES,
					XFS_ITRUNCATE_LOG_COUNT);
		if (error)
			return error;
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	}
	/*
	 * Only update the size in the case of the data fork, but
	 * always re-log the inode so that our permanent transaction
	 * can keep on rolling it forward in the log.
	 */
	if (fork == XFS_DATA_FORK) {
		xfs_isize_check(mp, ip, new_size);
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		/*
		 * If we are not changing the file size then do
		 * not update the on-disk file size - we may be
		 * called from xfs_inactive_free_eofblocks().  If we
		 * update the on-disk file size and then the system
		 * crashes before the contents of the file are
		 * flushed to disk then the files may be full of
		 * holes (ie NULL files bug).
		 */
		if (ip->i_size != new_size) {
			ip->i_d.di_size = new_size;
			ip->i_size = new_size;
		}
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	}
	xfs_trans_log_inode(ntp, ip, XFS_ILOG_CORE);
	ASSERT((new_size != 0) ||
	       (fork == XFS_ATTR_FORK) ||
	       (ip->i_delayed_blks == 0));
	ASSERT((new_size != 0) ||
	       (fork == XFS_ATTR_FORK) ||
	       (ip->i_d.di_nextents == 0));
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	trace_xfs_itruncate_finish_end(ip, new_size);
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	return 0;
}

/*
 * This is called when the inode's link count goes to 0.
 * We place the on-disk inode on a list in the AGI.  It
 * will be pulled from this list when the inode is freed.
 */
int
xfs_iunlink(
	xfs_trans_t	*tp,
	xfs_inode_t	*ip)
{
	xfs_mount_t	*mp;
	xfs_agi_t	*agi;
	xfs_dinode_t	*dip;
	xfs_buf_t	*agibp;
	xfs_buf_t	*ibp;
	xfs_agino_t	agino;
	short		bucket_index;
	int		offset;
	int		error;

	ASSERT(ip->i_d.di_nlink == 0);
	ASSERT(ip->i_d.di_mode != 0);
	ASSERT(ip->i_transp == tp);

	mp = tp->t_mountp;

	/*
	 * Get the agi buffer first.  It ensures lock ordering
	 * on the list.
	 */
1732
	error = xfs_read_agi(mp, tp, XFS_INO_TO_AGNO(mp, ip->i_ino), &agibp);
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	if (error)
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		return error;
	agi = XFS_BUF_TO_AGI(agibp);
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	/*
	 * Get the index into the agi hash table for the
	 * list this inode will go on.
	 */
	agino = XFS_INO_TO_AGINO(mp, ip->i_ino);
	ASSERT(agino != 0);
	bucket_index = agino % XFS_AGI_UNLINKED_BUCKETS;
	ASSERT(agi->agi_unlinked[bucket_index]);
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	ASSERT(be32_to_cpu(agi->agi_unlinked[bucket_index]) != agino);
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1747
	if (be32_to_cpu(agi->agi_unlinked[bucket_index]) != NULLAGINO) {
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		/*
		 * There is already another inode in the bucket we need
		 * to add ourselves to.  Add us at the front of the list.
		 * Here we put the head pointer into our next pointer,
		 * and then we fall through to point the head at us.
		 */
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		error = xfs_itobp(mp, tp, ip, &dip, &ibp, XBF_LOCK);
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		if (error)
			return error;

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		ASSERT(be32_to_cpu(dip->di_next_unlinked) == NULLAGINO);
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		/* both on-disk, don't endian flip twice */
		dip->di_next_unlinked = agi->agi_unlinked[bucket_index];
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		offset = ip->i_imap.im_boffset +
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			offsetof(xfs_dinode_t, di_next_unlinked);
		xfs_trans_inode_buf(tp, ibp);
		xfs_trans_log_buf(tp, ibp, offset,
				  (offset + sizeof(xfs_agino_t) - 1));
		xfs_inobp_check(mp, ibp);
	}

	/*
	 * Point the bucket head pointer at the inode being inserted.
	 */
	ASSERT(agino != 0);
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	agi->agi_unlinked[bucket_index] = cpu_to_be32(agino);
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	offset = offsetof(xfs_agi_t, agi_unlinked) +
		(sizeof(xfs_agino_t) * bucket_index);
	xfs_trans_log_buf(tp, agibp, offset,
			  (offset + sizeof(xfs_agino_t) - 1));
	return 0;
}

/*
 * Pull the on-disk inode from the AGI unlinked list.
 */
STATIC int
xfs_iunlink_remove(
	xfs_trans_t	*tp,
	xfs_inode_t	*ip)
{
	xfs_ino_t	next_ino;
	xfs_mount_t	*mp;
	xfs_agi_t	*agi;
	xfs_dinode_t	*dip;
	xfs_buf_t	*agibp;
	xfs_buf_t	*ibp;
	xfs_agnumber_t	agno;
	xfs_agino_t	agino;
	xfs_agino_t	next_agino;
	xfs_buf_t	*last_ibp;
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	xfs_dinode_t	*last_dip = NULL;
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	short		bucket_index;
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	int		offset, last_offset = 0;
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	int		error;

	mp = tp->t_mountp;
	agno = XFS_INO_TO_AGNO(mp, ip->i_ino);

	/*
	 * Get the agi buffer first.  It ensures lock ordering
	 * on the list.
	 */
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	error = xfs_read_agi(mp, tp, agno, &agibp);
	if (error)
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		return error;
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	agi = XFS_BUF_TO_AGI(agibp);
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	/*
	 * Get the index into the agi hash table for the
	 * list this inode will go on.
	 */
	agino = XFS_INO_TO_AGINO(mp, ip->i_ino);
	ASSERT(agino != 0);
	bucket_index = agino % XFS_AGI_UNLINKED_BUCKETS;
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	ASSERT(be32_to_cpu(agi->agi_unlinked[bucket_index]) != NULLAGINO);
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	ASSERT(agi->agi_unlinked[bucket_index]);

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	if (be32_to_cpu(agi->agi_unlinked[bucket_index]) == agino) {
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		/*
		 * We're at the head of the list.  Get the inode's
		 * on-disk buffer to see if there is anyone after us
		 * on the list.  Only modify our next pointer if it
		 * is not already NULLAGINO.  This saves us the overhead
		 * of dealing with the buffer when there is no need to
		 * change it.
		 */
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		error = xfs_itobp(mp, tp, ip, &dip, &ibp, XBF_LOCK);
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		if (error) {
			cmn_err(CE_WARN,
				"xfs_iunlink_remove: xfs_itobp()  returned an error %d on %s.  Returning error.",
				error, mp->m_fsname);
			return error;
		}
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		next_agino = be32_to_cpu(dip->di_next_unlinked);
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		ASSERT(next_agino != 0);
		if (next_agino != NULLAGINO) {
1846
			dip->di_next_unlinked = cpu_to_be32(NULLAGINO);
1847
			offset = ip->i_imap.im_boffset +
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				offsetof(xfs_dinode_t, di_next_unlinked);
			xfs_trans_inode_buf(tp, ibp);
			xfs_trans_log_buf(tp, ibp, offset,
					  (offset + sizeof(xfs_agino_t) - 1));
			xfs_inobp_check(mp, ibp);
		} else {
			xfs_trans_brelse(tp, ibp);
		}
		/*
		 * Point the bucket head pointer at the next inode.
		 */
		ASSERT(next_agino != 0);
		ASSERT(next_agino != agino);
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		agi->agi_unlinked[bucket_index] = cpu_to_be32(next_agino);
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		offset = offsetof(xfs_agi_t, agi_unlinked) +
			(sizeof(xfs_agino_t) * bucket_index);
		xfs_trans_log_buf(tp, agibp, offset,
				  (offset + sizeof(xfs_agino_t) - 1));
	} else {
		/*
		 * We need to search the list for the inode being freed.
		 */
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		next_agino = be32_to_cpu(agi->agi_unlinked[bucket_index]);
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		last_ibp = NULL;
		while (next_agino != agino) {
			/*
			 * If the last inode wasn't the one pointing to
			 * us, then release its buffer since we're not
			 * going to do anything with it.
			 */
			if (last_ibp != NULL) {
				xfs_trans_brelse(tp, last_ibp);
			}
			next_ino = XFS_AGINO_TO_INO(mp, agno, next_agino);
			error = xfs_inotobp(mp, tp, next_ino, &last_dip,
1883
					    &last_ibp, &last_offset, 0);
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			if (error) {
				cmn_err(CE_WARN,
			"xfs_iunlink_remove: xfs_inotobp()  returned an error %d on %s.  Returning error.",
					error, mp->m_fsname);
				return error;
			}
1890
			next_agino = be32_to_cpu(last_dip->di_next_unlinked);
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			ASSERT(next_agino != NULLAGINO);
			ASSERT(next_agino != 0);
		}
		/*
		 * Now last_ibp points to the buffer previous to us on
		 * the unlinked list.  Pull us from the list.
		 */
1898
		error = xfs_itobp(mp, tp, ip, &dip, &ibp, XBF_LOCK);
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		if (error) {
			cmn_err(CE_WARN,
				"xfs_iunlink_remove: xfs_itobp()  returned an error %d on %s.  Returning error.",
				error, mp->m_fsname);
			return error;
		}
1905
		next_agino = be32_to_cpu(dip->di_next_unlinked);
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		ASSERT(next_agino != 0);
		ASSERT(next_agino != agino);
		if (next_agino != NULLAGINO) {
1909
			dip->di_next_unlinked = cpu_to_be32(NULLAGINO);
1910
			offset = ip->i_imap.im_boffset +
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				offsetof(xfs_dinode_t, di_next_unlinked);
			xfs_trans_inode_buf(tp, ibp);
			xfs_trans_log_buf(tp, ibp, offset,
					  (offset + sizeof(xfs_agino_t) - 1));
			xfs_inobp_check(mp, ibp);
		} else {
			xfs_trans_brelse(tp, ibp);
		}
		/*
		 * Point the previous inode on the list to the next inode.
		 */
1922
		last_dip->di_next_unlinked = cpu_to_be32(next_agino);
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		ASSERT(next_agino != 0);
		offset = last_offset + offsetof(xfs_dinode_t, di_next_unlinked);
		xfs_trans_inode_buf(tp, last_ibp);
		xfs_trans_log_buf(tp, last_ibp, offset,
				  (offset + sizeof(xfs_agino_t) - 1));
		xfs_inobp_check(mp, last_ibp);
	}
	return 0;
}

1933
STATIC void
L
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xfs_ifree_cluster(
	xfs_inode_t	*free_ip,
	xfs_trans_t	*tp,
	xfs_ino_t	inum)
{
	xfs_mount_t		*mp = free_ip->i_mount;
	int			blks_per_cluster;
	int			nbufs;
	int			ninodes;
	int			i, j, found, pre_flushed;
	xfs_daddr_t		blkno;
	xfs_buf_t		*bp;
	xfs_inode_t		*ip, **ip_found;
	xfs_inode_log_item_t	*iip;
	xfs_log_item_t		*lip;
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	struct xfs_perag	*pag;
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	pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, inum));
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	if (mp->m_sb.sb_blocksize >= XFS_INODE_CLUSTER_SIZE(mp)) {
		blks_per_cluster = 1;
		ninodes = mp->m_sb.sb_inopblock;
		nbufs = XFS_IALLOC_BLOCKS(mp);
	} else {
		blks_per_cluster = XFS_INODE_CLUSTER_SIZE(mp) /
					mp->m_sb.sb_blocksize;
		ninodes = blks_per_cluster * mp->m_sb.sb_inopblock;
		nbufs = XFS_IALLOC_BLOCKS(mp) / blks_per_cluster;
	}

	ip_found = kmem_alloc(ninodes * sizeof(xfs_inode_t *), KM_NOFS);

	for (j = 0; j < nbufs; j++, inum += ninodes) {
		blkno = XFS_AGB_TO_DADDR(mp, XFS_INO_TO_AGNO(mp, inum),
					 XFS_INO_TO_AGBNO(mp, inum));


		/*
		 * Look for each inode in memory and attempt to lock it,
		 * we can be racing with flush and tail pushing here.
		 * any inode we get the locks on, add to an array of
		 * inode items to process later.
		 *
		 * The get the buffer lock, we could beat a flush
		 * or tail pushing thread to the lock here, in which
		 * case they will go looking for the inode buffer
		 * and fail, we need some other form of interlock
		 * here.
		 */
		found = 0;
		for (i = 0; i < ninodes; i++) {
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			read_lock(&pag->pag_ici_lock);
			ip = radix_tree_lookup(&pag->pag_ici_root,
					XFS_INO_TO_AGINO(mp, (inum + i)));
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			/* Inode not in memory or we found it already,
			 * nothing to do
			 */
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			if (!ip || xfs_iflags_test(ip, XFS_ISTALE)) {
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				read_unlock(&pag->pag_ici_lock);
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				continue;
			}

			if (xfs_inode_clean(ip)) {
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				read_unlock(&pag->pag_ici_lock);
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				continue;
			}

			/* If we can get the locks then add it to the
			 * list, otherwise by the time we get the bp lock
			 * below it will already be attached to the
			 * inode buffer.
			 */

			/* This inode will already be locked - by us, lets
			 * keep it that way.
			 */

			if (ip == free_ip) {
				if (xfs_iflock_nowait(ip)) {
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					xfs_iflags_set(ip, XFS_ISTALE);
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					if (xfs_inode_clean(ip)) {
						xfs_ifunlock(ip);
					} else {
						ip_found[found++] = ip;
					}
				}
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				read_unlock(&pag->pag_ici_lock);
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				continue;
			}

			if (xfs_ilock_nowait(ip, XFS_ILOCK_EXCL)) {
				if (xfs_iflock_nowait(ip)) {
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					xfs_iflags_set(ip, XFS_ISTALE);
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					if (xfs_inode_clean(ip)) {
						xfs_ifunlock(ip);
						xfs_iunlock(ip, XFS_ILOCK_EXCL);
					} else {
						ip_found[found++] = ip;
					}
				} else {
					xfs_iunlock(ip, XFS_ILOCK_EXCL);
				}
			}
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			read_unlock(&pag->pag_ici_lock);
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		}

		bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, blkno, 
					mp->m_bsize * blks_per_cluster,
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					XBF_LOCK);
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		pre_flushed = 0;
		lip = XFS_BUF_FSPRIVATE(bp, xfs_log_item_t *);
		while (lip) {
			if (lip->li_type == XFS_LI_INODE) {
				iip = (xfs_inode_log_item_t *)lip;
				ASSERT(iip->ili_logged == 1);
				lip->li_cb = (void(*)(xfs_buf_t*,xfs_log_item_t*)) xfs_istale_done;
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				xfs_trans_ail_copy_lsn(mp->m_ail,
							&iip->ili_flush_lsn,
							&iip->ili_item.li_lsn);
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				xfs_iflags_set(iip->ili_inode, XFS_ISTALE);
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				pre_flushed++;
			}
			lip = lip->li_bio_list;
		}

		for (i = 0; i < found; i++) {
			ip = ip_found[i];
			iip = ip->i_itemp;

			if (!iip) {
				ip->i_update_core = 0;
				xfs_ifunlock(ip);
				xfs_iunlock(ip, XFS_ILOCK_EXCL);
				continue;
			}

			iip->ili_last_fields = iip->ili_format.ilf_fields;
			iip->ili_format.ilf_fields = 0;
			iip->ili_logged = 1;
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			xfs_trans_ail_copy_lsn(mp->m_ail, &iip->ili_flush_lsn,
						&iip->ili_item.li_lsn);
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			xfs_buf_attach_iodone(bp,
				(void(*)(xfs_buf_t*,xfs_log_item_t*))
				xfs_istale_done, (xfs_log_item_t *)iip);
			if (ip != free_ip) {
				xfs_iunlock(ip, XFS_ILOCK_EXCL);
			}
		}

		if (found || pre_flushed)
			xfs_trans_stale_inode_buf(tp, bp);
		xfs_trans_binval(tp, bp);
	}

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	kmem_free(ip_found);
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	xfs_perag_put(pag);
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}

/*
 * This is called to return an inode to the inode free list.
 * The inode should already be truncated to 0 length and have
 * no pages associated with it.  This routine also assumes that
 * the inode is already a part of the transaction.
 *
 * The on-disk copy of the inode will have been added to the list
 * of unlinked inodes in the AGI. We need to remove the inode from
 * that list atomically with respect to freeing it here.
 */
int
xfs_ifree(
	xfs_trans_t	*tp,
	xfs_inode_t	*ip,
	xfs_bmap_free_t	*flist)
{
	int			error;
	int			delete;
	xfs_ino_t		first_ino;
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	xfs_dinode_t    	*dip;
	xfs_buf_t       	*ibp;
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	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
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	ASSERT(ip->i_transp == tp);
	ASSERT(ip->i_d.di_nlink == 0);
	ASSERT(ip->i_d.di_nextents == 0);
	ASSERT(ip->i_d.di_anextents == 0);
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	ASSERT((ip->i_d.di_size == 0 && ip->i_size == 0) ||
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	       ((ip->i_d.di_mode & S_IFMT) != S_IFREG));
	ASSERT(ip->i_d.di_nblocks == 0);

	/*
	 * Pull the on-disk inode from the AGI unlinked list.
	 */
	error = xfs_iunlink_remove(tp, ip);
	if (error != 0) {
		return error;
	}

	error = xfs_difree(tp, ip->i_ino, flist, &delete, &first_ino);
	if (error != 0) {
		return error;
	}
	ip->i_d.di_mode = 0;		/* mark incore inode as free */
	ip->i_d.di_flags = 0;
	ip->i_d.di_dmevmask = 0;
	ip->i_d.di_forkoff = 0;		/* mark the attr fork not in use */
	ip->i_df.if_ext_max =
		XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t);
	ip->i_d.di_format = XFS_DINODE_FMT_EXTENTS;
	ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS;
	/*
	 * Bump the generation count so no one will be confused
	 * by reincarnations of this inode.
	 */
	ip->i_d.di_gen++;
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	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);

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	error = xfs_itobp(ip->i_mount, tp, ip, &dip, &ibp, XBF_LOCK);
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	if (error)
		return error;

        /*
	* Clear the on-disk di_mode. This is to prevent xfs_bulkstat
	* from picking up this inode when it is reclaimed (its incore state
	* initialzed but not flushed to disk yet). The in-core di_mode is
	* already cleared  and a corresponding transaction logged.
	* The hack here just synchronizes the in-core to on-disk
	* di_mode value in advance before the actual inode sync to disk.
	* This is OK because the inode is already unlinked and would never
	* change its di_mode again for this inode generation.
	* This is a temporary hack that would require a proper fix
	* in the future.
	*/
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	dip->di_mode = 0;
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	if (delete) {
		xfs_ifree_cluster(ip, tp, first_ino);
	}

	return 0;
}

/*
 * Reallocate the space for if_broot based on the number of records
 * being added or deleted as indicated in rec_diff.  Move the records
 * and pointers in if_broot to fit the new size.  When shrinking this
 * will eliminate holes between the records and pointers created by
 * the caller.  When growing this will create holes to be filled in
 * by the caller.
 *
 * The caller must not request to add more records than would fit in
 * the on-disk inode root.  If the if_broot is currently NULL, then
 * if we adding records one will be allocated.  The caller must also
 * not request that the number of records go below zero, although
 * it can go to zero.
 *
 * ip -- the inode whose if_broot area is changing
 * ext_diff -- the change in the number of records, positive or negative,
 *	 requested for the if_broot array.
 */
void
xfs_iroot_realloc(
	xfs_inode_t		*ip,
	int			rec_diff,
	int			whichfork)
{
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	struct xfs_mount	*mp = ip->i_mount;
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	int			cur_max;
	xfs_ifork_t		*ifp;
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	struct xfs_btree_block	*new_broot;
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	int			new_max;
	size_t			new_size;
	char			*np;
	char			*op;

	/*
	 * Handle the degenerate case quietly.
	 */
	if (rec_diff == 0) {
		return;
	}

	ifp = XFS_IFORK_PTR(ip, whichfork);
	if (rec_diff > 0) {
		/*
		 * If there wasn't any memory allocated before, just
		 * allocate it now and get out.
		 */
		if (ifp->if_broot_bytes == 0) {
			new_size = (size_t)XFS_BMAP_BROOT_SPACE_CALC(rec_diff);
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			ifp->if_broot = kmem_alloc(new_size, KM_SLEEP);
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			ifp->if_broot_bytes = (int)new_size;
			return;
		}

		/*
		 * If there is already an existing if_broot, then we need
		 * to realloc() it and shift the pointers to their new
		 * location.  The records don't change location because
		 * they are kept butted up against the btree block header.
		 */
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		cur_max = xfs_bmbt_maxrecs(mp, ifp->if_broot_bytes, 0);
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		new_max = cur_max + rec_diff;
		new_size = (size_t)XFS_BMAP_BROOT_SPACE_CALC(new_max);
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		ifp->if_broot = kmem_realloc(ifp->if_broot, new_size,
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				(size_t)XFS_BMAP_BROOT_SPACE_CALC(cur_max), /* old size */
				KM_SLEEP);
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		op = (char *)XFS_BMAP_BROOT_PTR_ADDR(mp, ifp->if_broot, 1,
						     ifp->if_broot_bytes);
		np = (char *)XFS_BMAP_BROOT_PTR_ADDR(mp, ifp->if_broot, 1,
						     (int)new_size);
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		ifp->if_broot_bytes = (int)new_size;
		ASSERT(ifp->if_broot_bytes <=
			XFS_IFORK_SIZE(ip, whichfork) + XFS_BROOT_SIZE_ADJ);
		memmove(np, op, cur_max * (uint)sizeof(xfs_dfsbno_t));
		return;
	}

	/*
	 * rec_diff is less than 0.  In this case, we are shrinking the
	 * if_broot buffer.  It must already exist.  If we go to zero
	 * records, just get rid of the root and clear the status bit.
	 */
	ASSERT((ifp->if_broot != NULL) && (ifp->if_broot_bytes > 0));
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	cur_max = xfs_bmbt_maxrecs(mp, ifp->if_broot_bytes, 0);
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	new_max = cur_max + rec_diff;
	ASSERT(new_max >= 0);
	if (new_max > 0)
		new_size = (size_t)XFS_BMAP_BROOT_SPACE_CALC(new_max);
	else
		new_size = 0;
	if (new_size > 0) {
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		new_broot = kmem_alloc(new_size, KM_SLEEP);
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		/*
		 * First copy over the btree block header.
		 */
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		memcpy(new_broot, ifp->if_broot, XFS_BTREE_LBLOCK_LEN);
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	} else {
		new_broot = NULL;
		ifp->if_flags &= ~XFS_IFBROOT;
	}

	/*
	 * Only copy the records and pointers if there are any.
	 */
	if (new_max > 0) {
		/*
		 * First copy the records.
		 */
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		op = (char *)XFS_BMBT_REC_ADDR(mp, ifp->if_broot, 1);
		np = (char *)XFS_BMBT_REC_ADDR(mp, new_broot, 1);
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		memcpy(np, op, new_max * (uint)sizeof(xfs_bmbt_rec_t));

		/*
		 * Then copy the pointers.
		 */
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		op = (char *)XFS_BMAP_BROOT_PTR_ADDR(mp, ifp->if_broot, 1,
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						     ifp->if_broot_bytes);
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		np = (char *)XFS_BMAP_BROOT_PTR_ADDR(mp, new_broot, 1,
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						     (int)new_size);
		memcpy(np, op, new_max * (uint)sizeof(xfs_dfsbno_t));
	}
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	kmem_free(ifp->if_broot);
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	ifp->if_broot = new_broot;
	ifp->if_broot_bytes = (int)new_size;
	ASSERT(ifp->if_broot_bytes <=
		XFS_IFORK_SIZE(ip, whichfork) + XFS_BROOT_SIZE_ADJ);
	return;
}


/*
 * This is called when the amount of space needed for if_data
 * is increased or decreased.  The change in size is indicated by
 * the number of bytes that need to be added or deleted in the
 * byte_diff parameter.
 *
 * If the amount of space needed has decreased below the size of the
 * inline buffer, then switch to using the inline buffer.  Otherwise,
 * use kmem_realloc() or kmem_alloc() to adjust the size of the buffer
 * to what is needed.
 *
 * ip -- the inode whose if_data area is changing
 * byte_diff -- the change in the number of bytes, positive or negative,
 *	 requested for the if_data array.
 */
void
xfs_idata_realloc(
	xfs_inode_t	*ip,
	int		byte_diff,
	int		whichfork)
{
	xfs_ifork_t	*ifp;
	int		new_size;
	int		real_size;

	if (byte_diff == 0) {
		return;
	}

	ifp = XFS_IFORK_PTR(ip, whichfork);
	new_size = (int)ifp->if_bytes + byte_diff;
	ASSERT(new_size >= 0);

	if (new_size == 0) {
		if (ifp->if_u1.if_data != ifp->if_u2.if_inline_data) {
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			kmem_free(ifp->if_u1.if_data);
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		}
		ifp->if_u1.if_data = NULL;
		real_size = 0;
	} else if (new_size <= sizeof(ifp->if_u2.if_inline_data)) {
		/*
		 * If the valid extents/data can fit in if_inline_ext/data,
		 * copy them from the malloc'd vector and free it.
		 */
		if (ifp->if_u1.if_data == NULL) {
			ifp->if_u1.if_data = ifp->if_u2.if_inline_data;
		} else if (ifp->if_u1.if_data != ifp->if_u2.if_inline_data) {
			ASSERT(ifp->if_real_bytes != 0);
			memcpy(ifp->if_u2.if_inline_data, ifp->if_u1.if_data,
			      new_size);
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			kmem_free(ifp->if_u1.if_data);
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			ifp->if_u1.if_data = ifp->if_u2.if_inline_data;
		}
		real_size = 0;
	} else {
		/*
		 * Stuck with malloc/realloc.
		 * For inline data, the underlying buffer must be
		 * a multiple of 4 bytes in size so that it can be
		 * logged and stay on word boundaries.  We enforce
		 * that here.
		 */
		real_size = roundup(new_size, 4);
		if (ifp->if_u1.if_data == NULL) {
			ASSERT(ifp->if_real_bytes == 0);
			ifp->if_u1.if_data = kmem_alloc(real_size, KM_SLEEP);
		} else if (ifp->if_u1.if_data != ifp->if_u2.if_inline_data) {
			/*
			 * Only do the realloc if the underlying size
			 * is really changing.
			 */
			if (ifp->if_real_bytes != real_size) {
				ifp->if_u1.if_data =
					kmem_realloc(ifp->if_u1.if_data,
							real_size,
							ifp->if_real_bytes,
							KM_SLEEP);
			}
		} else {
			ASSERT(ifp->if_real_bytes == 0);
			ifp->if_u1.if_data = kmem_alloc(real_size, KM_SLEEP);
			memcpy(ifp->if_u1.if_data, ifp->if_u2.if_inline_data,
				ifp->if_bytes);
		}
	}
	ifp->if_real_bytes = real_size;
	ifp->if_bytes = new_size;
	ASSERT(ifp->if_bytes <= XFS_IFORK_SIZE(ip, whichfork));
}

void
xfs_idestroy_fork(
	xfs_inode_t	*ip,
	int		whichfork)
{
	xfs_ifork_t	*ifp;

	ifp = XFS_IFORK_PTR(ip, whichfork);
	if (ifp->if_broot != NULL) {
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		kmem_free(ifp->if_broot);
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		ifp->if_broot = NULL;
	}

	/*
	 * If the format is local, then we can't have an extents
	 * array so just look for an inline data array.  If we're
	 * not local then we may or may not have an extents list,
	 * so check and free it up if we do.
	 */
	if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
		if ((ifp->if_u1.if_data != ifp->if_u2.if_inline_data) &&
		    (ifp->if_u1.if_data != NULL)) {
			ASSERT(ifp->if_real_bytes != 0);
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			kmem_free(ifp->if_u1.if_data);
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			ifp->if_u1.if_data = NULL;
			ifp->if_real_bytes = 0;
		}
	} else if ((ifp->if_flags & XFS_IFEXTENTS) &&
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		   ((ifp->if_flags & XFS_IFEXTIREC) ||
		    ((ifp->if_u1.if_extents != NULL) &&
		     (ifp->if_u1.if_extents != ifp->if_u2.if_inline_ext)))) {
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		ASSERT(ifp->if_real_bytes != 0);
2430
		xfs_iext_destroy(ifp);
L
Linus Torvalds 已提交
2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441
	}
	ASSERT(ifp->if_u1.if_extents == NULL ||
	       ifp->if_u1.if_extents == ifp->if_u2.if_inline_ext);
	ASSERT(ifp->if_real_bytes == 0);
	if (whichfork == XFS_ATTR_FORK) {
		kmem_zone_free(xfs_ifork_zone, ip->i_afp);
		ip->i_afp = NULL;
	}
}

/*
2442 2443 2444
 * This is called to unpin an inode.  The caller must have the inode locked
 * in at least shared mode so that the buffer cannot be subsequently pinned
 * once someone is waiting for it to be unpinned.
L
Linus Torvalds 已提交
2445
 */
2446 2447 2448
static void
xfs_iunpin_nowait(
	struct xfs_inode	*ip)
L
Linus Torvalds 已提交
2449
{
C
Christoph Hellwig 已提交
2450
	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
L
Linus Torvalds 已提交
2451

2452
	/* Give the log a push to start the unpinning I/O */
2453
	xfs_log_force_lsn(ip->i_mount, ip->i_itemp->ili_last_lsn, 0);
2454

2455
}
L
Linus Torvalds 已提交
2456

2457
void
2458
xfs_iunpin_wait(
2459
	struct xfs_inode	*ip)
2460
{
2461 2462 2463 2464
	if (xfs_ipincount(ip)) {
		xfs_iunpin_nowait(ip);
		wait_event(ip->i_ipin_wait, (xfs_ipincount(ip) == 0));
	}
L
Linus Torvalds 已提交
2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480
}

/*
 * xfs_iextents_copy()
 *
 * This is called to copy the REAL extents (as opposed to the delayed
 * allocation extents) from the inode into the given buffer.  It
 * returns the number of bytes copied into the buffer.
 *
 * If there are no delayed allocation extents, then we can just
 * memcpy() the extents into the buffer.  Otherwise, we need to
 * examine each extent in turn and skip those which are delayed.
 */
int
xfs_iextents_copy(
	xfs_inode_t		*ip,
2481
	xfs_bmbt_rec_t		*dp,
L
Linus Torvalds 已提交
2482 2483 2484 2485 2486 2487 2488 2489 2490
	int			whichfork)
{
	int			copied;
	int			i;
	xfs_ifork_t		*ifp;
	int			nrecs;
	xfs_fsblock_t		start_block;

	ifp = XFS_IFORK_PTR(ip, whichfork);
C
Christoph Hellwig 已提交
2491
	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
L
Linus Torvalds 已提交
2492 2493 2494
	ASSERT(ifp->if_bytes > 0);

	nrecs = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
2495
	XFS_BMAP_TRACE_EXLIST(ip, nrecs, whichfork);
L
Linus Torvalds 已提交
2496 2497 2498 2499 2500 2501 2502 2503 2504 2505
	ASSERT(nrecs > 0);

	/*
	 * There are some delayed allocation extents in the
	 * inode, so copy the extents one at a time and skip
	 * the delayed ones.  There must be at least one
	 * non-delayed extent.
	 */
	copied = 0;
	for (i = 0; i < nrecs; i++) {
2506
		xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, i);
L
Linus Torvalds 已提交
2507
		start_block = xfs_bmbt_get_startblock(ep);
2508
		if (isnullstartblock(start_block)) {
L
Linus Torvalds 已提交
2509 2510 2511 2512 2513 2514 2515
			/*
			 * It's a delayed allocation extent, so skip it.
			 */
			continue;
		}

		/* Translate to on disk format */
2516 2517
		put_unaligned(cpu_to_be64(ep->l0), &dp->l0);
		put_unaligned(cpu_to_be64(ep->l1), &dp->l1);
2518
		dp++;
L
Linus Torvalds 已提交
2519 2520 2521
		copied++;
	}
	ASSERT(copied != 0);
2522
	xfs_validate_extents(ifp, copied, XFS_EXTFMT_INODE(ip));
L
Linus Torvalds 已提交
2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537

	return (copied * (uint)sizeof(xfs_bmbt_rec_t));
}

/*
 * Each of the following cases stores data into the same region
 * of the on-disk inode, so only one of them can be valid at
 * any given time. While it is possible to have conflicting formats
 * and log flags, e.g. having XFS_ILOG_?DATA set when the fork is
 * in EXTENTS format, this can only happen when the fork has
 * changed formats after being modified but before being flushed.
 * In these cases, the format always takes precedence, because the
 * format indicates the current state of the fork.
 */
/*ARGSUSED*/
2538
STATIC void
L
Linus Torvalds 已提交
2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558
xfs_iflush_fork(
	xfs_inode_t		*ip,
	xfs_dinode_t		*dip,
	xfs_inode_log_item_t	*iip,
	int			whichfork,
	xfs_buf_t		*bp)
{
	char			*cp;
	xfs_ifork_t		*ifp;
	xfs_mount_t		*mp;
#ifdef XFS_TRANS_DEBUG
	int			first;
#endif
	static const short	brootflag[2] =
		{ XFS_ILOG_DBROOT, XFS_ILOG_ABROOT };
	static const short	dataflag[2] =
		{ XFS_ILOG_DDATA, XFS_ILOG_ADATA };
	static const short	extflag[2] =
		{ XFS_ILOG_DEXT, XFS_ILOG_AEXT };

2559 2560
	if (!iip)
		return;
L
Linus Torvalds 已提交
2561 2562 2563 2564 2565
	ifp = XFS_IFORK_PTR(ip, whichfork);
	/*
	 * This can happen if we gave up in iformat in an error path,
	 * for the attribute fork.
	 */
2566
	if (!ifp) {
L
Linus Torvalds 已提交
2567
		ASSERT(whichfork == XFS_ATTR_FORK);
2568
		return;
L
Linus Torvalds 已提交
2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584
	}
	cp = XFS_DFORK_PTR(dip, whichfork);
	mp = ip->i_mount;
	switch (XFS_IFORK_FORMAT(ip, whichfork)) {
	case XFS_DINODE_FMT_LOCAL:
		if ((iip->ili_format.ilf_fields & dataflag[whichfork]) &&
		    (ifp->if_bytes > 0)) {
			ASSERT(ifp->if_u1.if_data != NULL);
			ASSERT(ifp->if_bytes <= XFS_IFORK_SIZE(ip, whichfork));
			memcpy(cp, ifp->if_u1.if_data, ifp->if_bytes);
		}
		break;

	case XFS_DINODE_FMT_EXTENTS:
		ASSERT((ifp->if_flags & XFS_IFEXTENTS) ||
		       !(iip->ili_format.ilf_fields & extflag[whichfork]));
2585 2586 2587 2588
		ASSERT((xfs_iext_get_ext(ifp, 0) != NULL) ||
			(ifp->if_bytes == 0));
		ASSERT((xfs_iext_get_ext(ifp, 0) == NULL) ||
			(ifp->if_bytes > 0));
L
Linus Torvalds 已提交
2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603
		if ((iip->ili_format.ilf_fields & extflag[whichfork]) &&
		    (ifp->if_bytes > 0)) {
			ASSERT(XFS_IFORK_NEXTENTS(ip, whichfork) > 0);
			(void)xfs_iextents_copy(ip, (xfs_bmbt_rec_t *)cp,
				whichfork);
		}
		break;

	case XFS_DINODE_FMT_BTREE:
		if ((iip->ili_format.ilf_fields & brootflag[whichfork]) &&
		    (ifp->if_broot_bytes > 0)) {
			ASSERT(ifp->if_broot != NULL);
			ASSERT(ifp->if_broot_bytes <=
			       (XFS_IFORK_SIZE(ip, whichfork) +
				XFS_BROOT_SIZE_ADJ));
2604
			xfs_bmbt_to_bmdr(mp, ifp->if_broot, ifp->if_broot_bytes,
L
Linus Torvalds 已提交
2605 2606 2607 2608 2609 2610 2611 2612
				(xfs_bmdr_block_t *)cp,
				XFS_DFORK_SIZE(dip, mp, whichfork));
		}
		break;

	case XFS_DINODE_FMT_DEV:
		if (iip->ili_format.ilf_fields & XFS_ILOG_DEV) {
			ASSERT(whichfork == XFS_DATA_FORK);
C
Christoph Hellwig 已提交
2613
			xfs_dinode_put_rdev(dip, ip->i_df.if_u2.if_rdev);
L
Linus Torvalds 已提交
2614 2615 2616 2617 2618 2619
		}
		break;

	case XFS_DINODE_FMT_UUID:
		if (iip->ili_format.ilf_fields & XFS_ILOG_UUID) {
			ASSERT(whichfork == XFS_DATA_FORK);
C
Christoph Hellwig 已提交
2620 2621 2622
			memcpy(XFS_DFORK_DPTR(dip),
			       &ip->i_df.if_u2.if_uuid,
			       sizeof(uuid_t));
L
Linus Torvalds 已提交
2623 2624 2625 2626 2627 2628 2629 2630 2631
		}
		break;

	default:
		ASSERT(0);
		break;
	}
}

2632 2633 2634 2635 2636 2637
STATIC int
xfs_iflush_cluster(
	xfs_inode_t	*ip,
	xfs_buf_t	*bp)
{
	xfs_mount_t		*mp = ip->i_mount;
D
Dave Chinner 已提交
2638
	struct xfs_perag	*pag;
2639
	unsigned long		first_index, mask;
2640
	unsigned long		inodes_per_cluster;
2641 2642 2643 2644 2645 2646 2647 2648
	int			ilist_size;
	xfs_inode_t		**ilist;
	xfs_inode_t		*iq;
	int			nr_found;
	int			clcount = 0;
	int			bufwasdelwri;
	int			i;

D
Dave Chinner 已提交
2649
	pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ip->i_ino));
2650 2651 2652
	ASSERT(pag->pagi_inodeok);
	ASSERT(pag->pag_ici_init);

2653 2654
	inodes_per_cluster = XFS_INODE_CLUSTER_SIZE(mp) >> mp->m_sb.sb_inodelog;
	ilist_size = inodes_per_cluster * sizeof(xfs_inode_t *);
2655
	ilist = kmem_alloc(ilist_size, KM_MAYFAIL|KM_NOFS);
2656
	if (!ilist)
2657
		goto out_put;
2658 2659 2660 2661 2662 2663

	mask = ~(((XFS_INODE_CLUSTER_SIZE(mp) >> mp->m_sb.sb_inodelog)) - 1);
	first_index = XFS_INO_TO_AGINO(mp, ip->i_ino) & mask;
	read_lock(&pag->pag_ici_lock);
	/* really need a gang lookup range call here */
	nr_found = radix_tree_gang_lookup(&pag->pag_ici_root, (void**)ilist,
2664
					first_index, inodes_per_cluster);
2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679
	if (nr_found == 0)
		goto out_free;

	for (i = 0; i < nr_found; i++) {
		iq = ilist[i];
		if (iq == ip)
			continue;
		/* if the inode lies outside this cluster, we're done. */
		if ((XFS_INO_TO_AGINO(mp, iq->i_ino) & mask) != first_index)
			break;
		/*
		 * Do an un-protected check to see if the inode is dirty and
		 * is a candidate for flushing.  These checks will be repeated
		 * later after the appropriate locks are acquired.
		 */
2680
		if (xfs_inode_clean(iq) && xfs_ipincount(iq) == 0)
2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703
			continue;

		/*
		 * Try to get locks.  If any are unavailable or it is pinned,
		 * then this inode cannot be flushed and is skipped.
		 */

		if (!xfs_ilock_nowait(iq, XFS_ILOCK_SHARED))
			continue;
		if (!xfs_iflock_nowait(iq)) {
			xfs_iunlock(iq, XFS_ILOCK_SHARED);
			continue;
		}
		if (xfs_ipincount(iq)) {
			xfs_ifunlock(iq);
			xfs_iunlock(iq, XFS_ILOCK_SHARED);
			continue;
		}

		/*
		 * arriving here means that this inode can be flushed.  First
		 * re-check that it's dirty before flushing.
		 */
2704 2705
		if (!xfs_inode_clean(iq)) {
			int	error;
2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724
			error = xfs_iflush_int(iq, bp);
			if (error) {
				xfs_iunlock(iq, XFS_ILOCK_SHARED);
				goto cluster_corrupt_out;
			}
			clcount++;
		} else {
			xfs_ifunlock(iq);
		}
		xfs_iunlock(iq, XFS_ILOCK_SHARED);
	}

	if (clcount) {
		XFS_STATS_INC(xs_icluster_flushcnt);
		XFS_STATS_ADD(xs_icluster_flushinode, clcount);
	}

out_free:
	read_unlock(&pag->pag_ici_lock);
2725
	kmem_free(ilist);
2726 2727
out_put:
	xfs_perag_put(pag);
2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769
	return 0;


cluster_corrupt_out:
	/*
	 * Corruption detected in the clustering loop.  Invalidate the
	 * inode buffer and shut down the filesystem.
	 */
	read_unlock(&pag->pag_ici_lock);
	/*
	 * Clean up the buffer.  If it was B_DELWRI, just release it --
	 * brelse can handle it with no problems.  If not, shut down the
	 * filesystem before releasing the buffer.
	 */
	bufwasdelwri = XFS_BUF_ISDELAYWRITE(bp);
	if (bufwasdelwri)
		xfs_buf_relse(bp);

	xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);

	if (!bufwasdelwri) {
		/*
		 * Just like incore_relse: if we have b_iodone functions,
		 * mark the buffer as an error and call them.  Otherwise
		 * mark it as stale and brelse.
		 */
		if (XFS_BUF_IODONE_FUNC(bp)) {
			XFS_BUF_CLR_BDSTRAT_FUNC(bp);
			XFS_BUF_UNDONE(bp);
			XFS_BUF_STALE(bp);
			XFS_BUF_ERROR(bp,EIO);
			xfs_biodone(bp);
		} else {
			XFS_BUF_STALE(bp);
			xfs_buf_relse(bp);
		}
	}

	/*
	 * Unlocks the flush lock
	 */
	xfs_iflush_abort(iq);
2770
	kmem_free(ilist);
2771
	xfs_perag_put(pag);
2772 2773 2774
	return XFS_ERROR(EFSCORRUPTED);
}

L
Linus Torvalds 已提交
2775 2776 2777
/*
 * xfs_iflush() will write a modified inode's changes out to the
 * inode's on disk home.  The caller must have the inode lock held
2778 2779
 * in at least shared mode and the inode flush completion must be
 * active as well.  The inode lock will still be held upon return from
L
Linus Torvalds 已提交
2780
 * the call and the caller is free to unlock it.
2781
 * The inode flush will be completed when the inode reaches the disk.
L
Linus Torvalds 已提交
2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796
 * The flags indicate how the inode's buffer should be written out.
 */
int
xfs_iflush(
	xfs_inode_t		*ip,
	uint			flags)
{
	xfs_inode_log_item_t	*iip;
	xfs_buf_t		*bp;
	xfs_dinode_t		*dip;
	xfs_mount_t		*mp;
	int			error;

	XFS_STATS_INC(xs_iflush_count);

C
Christoph Hellwig 已提交
2797
	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
2798
	ASSERT(!completion_done(&ip->i_flush));
L
Linus Torvalds 已提交
2799 2800 2801 2802 2803 2804 2805
	ASSERT(ip->i_d.di_format != XFS_DINODE_FMT_BTREE ||
	       ip->i_d.di_nextents > ip->i_df.if_ext_max);

	iip = ip->i_itemp;
	mp = ip->i_mount;

	/*
2806 2807 2808 2809 2810 2811 2812 2813 2814
	 * We can't flush the inode until it is unpinned, so wait for it if we
	 * are allowed to block.  We know noone new can pin it, because we are
	 * holding the inode lock shared and you need to hold it exclusively to
	 * pin the inode.
	 *
	 * If we are not allowed to block, force the log out asynchronously so
	 * that when we come back the inode will be unpinned. If other inodes
	 * in the same cluster are dirty, they will probably write the inode
	 * out for us if they occur after the log force completes.
L
Linus Torvalds 已提交
2815
	 */
2816
	if (!(flags & SYNC_WAIT) && xfs_ipincount(ip)) {
2817 2818 2819 2820
		xfs_iunpin_nowait(ip);
		xfs_ifunlock(ip);
		return EAGAIN;
	}
L
Linus Torvalds 已提交
2821 2822
	xfs_iunpin_wait(ip);

2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835
	/*
	 * For stale inodes we cannot rely on the backing buffer remaining
	 * stale in cache for the remaining life of the stale inode and so
	 * xfs_itobp() below may give us a buffer that no longer contains
	 * inodes below. We have to check this after ensuring the inode is
	 * unpinned so that it is safe to reclaim the stale inode after the
	 * flush call.
	 */
	if (xfs_iflags_test(ip, XFS_ISTALE)) {
		xfs_ifunlock(ip);
		return 0;
	}

L
Linus Torvalds 已提交
2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848
	/*
	 * This may have been unpinned because the filesystem is shutting
	 * down forcibly. If that's the case we must not write this inode
	 * to disk, because the log record didn't make it to disk!
	 */
	if (XFS_FORCED_SHUTDOWN(mp)) {
		ip->i_update_core = 0;
		if (iip)
			iip->ili_format.ilf_fields = 0;
		xfs_ifunlock(ip);
		return XFS_ERROR(EIO);
	}

2849 2850 2851
	/*
	 * Get the buffer containing the on-disk inode.
	 */
2852
	error = xfs_itobp(mp, NULL, ip, &dip, &bp,
2853
				(flags & SYNC_WAIT) ? XBF_LOCK : XBF_TRYLOCK);
2854 2855 2856 2857 2858
	if (error || !bp) {
		xfs_ifunlock(ip);
		return error;
	}

L
Linus Torvalds 已提交
2859 2860 2861 2862
	/*
	 * First flush out the inode that xfs_iflush was called with.
	 */
	error = xfs_iflush_int(ip, bp);
2863
	if (error)
L
Linus Torvalds 已提交
2864 2865
		goto corrupt_out;

2866 2867 2868 2869 2870
	/*
	 * If the buffer is pinned then push on the log now so we won't
	 * get stuck waiting in the write for too long.
	 */
	if (XFS_BUF_ISPINNED(bp))
2871
		xfs_log_force(mp, 0);
2872

L
Linus Torvalds 已提交
2873 2874 2875 2876
	/*
	 * inode clustering:
	 * see if other inodes can be gathered into this write
	 */
2877 2878 2879
	error = xfs_iflush_cluster(ip, bp);
	if (error)
		goto cluster_corrupt_out;
L
Linus Torvalds 已提交
2880

2881
	if (flags & SYNC_WAIT)
L
Linus Torvalds 已提交
2882
		error = xfs_bwrite(mp, bp);
2883 2884
	else
		xfs_bdwrite(mp, bp);
L
Linus Torvalds 已提交
2885 2886 2887 2888
	return error;

corrupt_out:
	xfs_buf_relse(bp);
2889
	xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
L
Linus Torvalds 已提交
2890 2891 2892 2893
cluster_corrupt_out:
	/*
	 * Unlocks the flush lock
	 */
2894
	xfs_iflush_abort(ip);
L
Linus Torvalds 已提交
2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910
	return XFS_ERROR(EFSCORRUPTED);
}


STATIC int
xfs_iflush_int(
	xfs_inode_t		*ip,
	xfs_buf_t		*bp)
{
	xfs_inode_log_item_t	*iip;
	xfs_dinode_t		*dip;
	xfs_mount_t		*mp;
#ifdef XFS_TRANS_DEBUG
	int			first;
#endif

C
Christoph Hellwig 已提交
2911
	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
2912
	ASSERT(!completion_done(&ip->i_flush));
L
Linus Torvalds 已提交
2913 2914 2915 2916 2917 2918 2919
	ASSERT(ip->i_d.di_format != XFS_DINODE_FMT_BTREE ||
	       ip->i_d.di_nextents > ip->i_df.if_ext_max);

	iip = ip->i_itemp;
	mp = ip->i_mount;

	/* set *dip = inode's place in the buffer */
2920
	dip = (xfs_dinode_t *)xfs_buf_offset(bp, ip->i_imap.im_boffset);
L
Linus Torvalds 已提交
2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936

	/*
	 * Clear i_update_core before copying out the data.
	 * This is for coordination with our timestamp updates
	 * that don't hold the inode lock. They will always
	 * update the timestamps BEFORE setting i_update_core,
	 * so if we clear i_update_core after they set it we
	 * are guaranteed to see their updates to the timestamps.
	 * I believe that this depends on strongly ordered memory
	 * semantics, but we have that.  We use the SYNCHRONIZE
	 * macro to make sure that the compiler does not reorder
	 * the i_update_core access below the data copy below.
	 */
	ip->i_update_core = 0;
	SYNCHRONIZE();

2937
	/*
2938
	 * Make sure to get the latest timestamps from the Linux inode.
2939
	 */
2940
	xfs_synchronize_times(ip);
2941

C
Christoph Hellwig 已提交
2942
	if (XFS_TEST_ERROR(be16_to_cpu(dip->di_magic) != XFS_DINODE_MAGIC,
L
Linus Torvalds 已提交
2943 2944 2945
			       mp, XFS_ERRTAG_IFLUSH_1, XFS_RANDOM_IFLUSH_1)) {
		xfs_cmn_err(XFS_PTAG_IFLUSH, CE_ALERT, mp,
		    "xfs_iflush: Bad inode %Lu magic number 0x%x, ptr 0x%p",
C
Christoph Hellwig 已提交
2946
			ip->i_ino, be16_to_cpu(dip->di_magic), dip);
L
Linus Torvalds 已提交
2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008
		goto corrupt_out;
	}
	if (XFS_TEST_ERROR(ip->i_d.di_magic != XFS_DINODE_MAGIC,
				mp, XFS_ERRTAG_IFLUSH_2, XFS_RANDOM_IFLUSH_2)) {
		xfs_cmn_err(XFS_PTAG_IFLUSH, CE_ALERT, mp,
			"xfs_iflush: Bad inode %Lu, ptr 0x%p, magic number 0x%x",
			ip->i_ino, ip, ip->i_d.di_magic);
		goto corrupt_out;
	}
	if ((ip->i_d.di_mode & S_IFMT) == S_IFREG) {
		if (XFS_TEST_ERROR(
		    (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS) &&
		    (ip->i_d.di_format != XFS_DINODE_FMT_BTREE),
		    mp, XFS_ERRTAG_IFLUSH_3, XFS_RANDOM_IFLUSH_3)) {
			xfs_cmn_err(XFS_PTAG_IFLUSH, CE_ALERT, mp,
				"xfs_iflush: Bad regular inode %Lu, ptr 0x%p",
				ip->i_ino, ip);
			goto corrupt_out;
		}
	} else if ((ip->i_d.di_mode & S_IFMT) == S_IFDIR) {
		if (XFS_TEST_ERROR(
		    (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS) &&
		    (ip->i_d.di_format != XFS_DINODE_FMT_BTREE) &&
		    (ip->i_d.di_format != XFS_DINODE_FMT_LOCAL),
		    mp, XFS_ERRTAG_IFLUSH_4, XFS_RANDOM_IFLUSH_4)) {
			xfs_cmn_err(XFS_PTAG_IFLUSH, CE_ALERT, mp,
				"xfs_iflush: Bad directory inode %Lu, ptr 0x%p",
				ip->i_ino, ip);
			goto corrupt_out;
		}
	}
	if (XFS_TEST_ERROR(ip->i_d.di_nextents + ip->i_d.di_anextents >
				ip->i_d.di_nblocks, mp, XFS_ERRTAG_IFLUSH_5,
				XFS_RANDOM_IFLUSH_5)) {
		xfs_cmn_err(XFS_PTAG_IFLUSH, CE_ALERT, mp,
			"xfs_iflush: detected corrupt incore inode %Lu, total extents = %d, nblocks = %Ld, ptr 0x%p",
			ip->i_ino,
			ip->i_d.di_nextents + ip->i_d.di_anextents,
			ip->i_d.di_nblocks,
			ip);
		goto corrupt_out;
	}
	if (XFS_TEST_ERROR(ip->i_d.di_forkoff > mp->m_sb.sb_inodesize,
				mp, XFS_ERRTAG_IFLUSH_6, XFS_RANDOM_IFLUSH_6)) {
		xfs_cmn_err(XFS_PTAG_IFLUSH, CE_ALERT, mp,
			"xfs_iflush: bad inode %Lu, forkoff 0x%x, ptr 0x%p",
			ip->i_ino, ip->i_d.di_forkoff, ip);
		goto corrupt_out;
	}
	/*
	 * bump the flush iteration count, used to detect flushes which
	 * postdate a log record during recovery.
	 */

	ip->i_d.di_flushiter++;

	/*
	 * Copy the dirty parts of the inode into the on-disk
	 * inode.  We always copy out the core of the inode,
	 * because if the inode is dirty at all the core must
	 * be.
	 */
C
Christoph Hellwig 已提交
3009
	xfs_dinode_to_disk(dip, &ip->i_d);
L
Linus Torvalds 已提交
3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020

	/* Wrap, we never let the log put out DI_MAX_FLUSH */
	if (ip->i_d.di_flushiter == DI_MAX_FLUSH)
		ip->i_d.di_flushiter = 0;

	/*
	 * If this is really an old format inode and the superblock version
	 * has not been updated to support only new format inodes, then
	 * convert back to the old inode format.  If the superblock version
	 * has been updated, then make the conversion permanent.
	 */
3021 3022
	ASSERT(ip->i_d.di_version == 1 || xfs_sb_version_hasnlink(&mp->m_sb));
	if (ip->i_d.di_version == 1) {
3023
		if (!xfs_sb_version_hasnlink(&mp->m_sb)) {
L
Linus Torvalds 已提交
3024 3025 3026 3027
			/*
			 * Convert it back.
			 */
			ASSERT(ip->i_d.di_nlink <= XFS_MAXLINK_1);
C
Christoph Hellwig 已提交
3028
			dip->di_onlink = cpu_to_be16(ip->i_d.di_nlink);
L
Linus Torvalds 已提交
3029 3030 3031 3032 3033 3034
		} else {
			/*
			 * The superblock version has already been bumped,
			 * so just make the conversion to the new inode
			 * format permanent.
			 */
3035 3036
			ip->i_d.di_version = 2;
			dip->di_version = 2;
L
Linus Torvalds 已提交
3037
			ip->i_d.di_onlink = 0;
C
Christoph Hellwig 已提交
3038
			dip->di_onlink = 0;
L
Linus Torvalds 已提交
3039
			memset(&(ip->i_d.di_pad[0]), 0, sizeof(ip->i_d.di_pad));
C
Christoph Hellwig 已提交
3040 3041
			memset(&(dip->di_pad[0]), 0,
			      sizeof(dip->di_pad));
L
Linus Torvalds 已提交
3042 3043 3044 3045
			ASSERT(ip->i_d.di_projid == 0);
		}
	}

3046 3047 3048
	xfs_iflush_fork(ip, dip, iip, XFS_DATA_FORK, bp);
	if (XFS_IFORK_Q(ip))
		xfs_iflush_fork(ip, dip, iip, XFS_ATTR_FORK, bp);
L
Linus Torvalds 已提交
3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083
	xfs_inobp_check(mp, bp);

	/*
	 * We've recorded everything logged in the inode, so we'd
	 * like to clear the ilf_fields bits so we don't log and
	 * flush things unnecessarily.  However, we can't stop
	 * logging all this information until the data we've copied
	 * into the disk buffer is written to disk.  If we did we might
	 * overwrite the copy of the inode in the log with all the
	 * data after re-logging only part of it, and in the face of
	 * a crash we wouldn't have all the data we need to recover.
	 *
	 * What we do is move the bits to the ili_last_fields field.
	 * When logging the inode, these bits are moved back to the
	 * ilf_fields field.  In the xfs_iflush_done() routine we
	 * clear ili_last_fields, since we know that the information
	 * those bits represent is permanently on disk.  As long as
	 * the flush completes before the inode is logged again, then
	 * both ilf_fields and ili_last_fields will be cleared.
	 *
	 * We can play with the ilf_fields bits here, because the inode
	 * lock must be held exclusively in order to set bits there
	 * and the flush lock protects the ili_last_fields bits.
	 * Set ili_logged so the flush done
	 * routine can tell whether or not to look in the AIL.
	 * Also, store the current LSN of the inode so that we can tell
	 * whether the item has moved in the AIL from xfs_iflush_done().
	 * In order to read the lsn we need the AIL lock, because
	 * it is a 64 bit value that cannot be read atomically.
	 */
	if (iip != NULL && iip->ili_format.ilf_fields != 0) {
		iip->ili_last_fields = iip->ili_format.ilf_fields;
		iip->ili_format.ilf_fields = 0;
		iip->ili_logged = 1;

3084 3085
		xfs_trans_ail_copy_lsn(mp->m_ail, &iip->ili_flush_lsn,
					&iip->ili_item.li_lsn);
L
Linus Torvalds 已提交
3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121

		/*
		 * Attach the function xfs_iflush_done to the inode's
		 * buffer.  This will remove the inode from the AIL
		 * and unlock the inode's flush lock when the inode is
		 * completely written to disk.
		 */
		xfs_buf_attach_iodone(bp, (void(*)(xfs_buf_t*,xfs_log_item_t*))
				      xfs_iflush_done, (xfs_log_item_t *)iip);

		ASSERT(XFS_BUF_FSPRIVATE(bp, void *) != NULL);
		ASSERT(XFS_BUF_IODONE_FUNC(bp) != NULL);
	} else {
		/*
		 * We're flushing an inode which is not in the AIL and has
		 * not been logged but has i_update_core set.  For this
		 * case we can use a B_DELWRI flush and immediately drop
		 * the inode flush lock because we can avoid the whole
		 * AIL state thing.  It's OK to drop the flush lock now,
		 * because we've already locked the buffer and to do anything
		 * you really need both.
		 */
		if (iip != NULL) {
			ASSERT(iip->ili_logged == 0);
			ASSERT(iip->ili_last_fields == 0);
			ASSERT((iip->ili_item.li_flags & XFS_LI_IN_AIL) == 0);
		}
		xfs_ifunlock(ip);
	}

	return 0;

corrupt_out:
	return XFS_ERROR(EFSCORRUPTED);
}

3122 3123 3124
/*
 * Return a pointer to the extent record at file index idx.
 */
3125
xfs_bmbt_rec_host_t *
3126 3127 3128 3129 3130
xfs_iext_get_ext(
	xfs_ifork_t	*ifp,		/* inode fork pointer */
	xfs_extnum_t	idx)		/* index of target extent */
{
	ASSERT(idx >= 0);
3131 3132 3133 3134 3135 3136 3137 3138 3139 3140
	if ((ifp->if_flags & XFS_IFEXTIREC) && (idx == 0)) {
		return ifp->if_u1.if_ext_irec->er_extbuf;
	} else if (ifp->if_flags & XFS_IFEXTIREC) {
		xfs_ext_irec_t	*erp;		/* irec pointer */
		int		erp_idx = 0;	/* irec index */
		xfs_extnum_t	page_idx = idx;	/* ext index in target list */

		erp = xfs_iext_idx_to_irec(ifp, &page_idx, &erp_idx, 0);
		return &erp->er_extbuf[page_idx];
	} else if (ifp->if_bytes) {
3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152
		return &ifp->if_u1.if_extents[idx];
	} else {
		return NULL;
	}
}

/*
 * Insert new item(s) into the extent records for incore inode
 * fork 'ifp'.  'count' new items are inserted at index 'idx'.
 */
void
xfs_iext_insert(
3153
	xfs_inode_t	*ip,		/* incore inode pointer */
3154 3155
	xfs_extnum_t	idx,		/* starting index of new items */
	xfs_extnum_t	count,		/* number of inserted items */
3156 3157
	xfs_bmbt_irec_t	*new,		/* items to insert */
	int		state)		/* type of extent conversion */
3158
{
3159
	xfs_ifork_t	*ifp = (state & BMAP_ATTRFORK) ? ip->i_afp : &ip->i_df;
3160 3161
	xfs_extnum_t	i;		/* extent record index */

C
Christoph Hellwig 已提交
3162 3163
	trace_xfs_iext_insert(ip, idx, new, state, _RET_IP_);

3164 3165
	ASSERT(ifp->if_flags & XFS_IFEXTENTS);
	xfs_iext_add(ifp, idx, count);
3166 3167
	for (i = idx; i < idx + count; i++, new++)
		xfs_bmbt_set_all(xfs_iext_get_ext(ifp, i), new);
3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185
}

/*
 * This is called when the amount of space required for incore file
 * extents needs to be increased. The ext_diff parameter stores the
 * number of new extents being added and the idx parameter contains
 * the extent index where the new extents will be added. If the new
 * extents are being appended, then we just need to (re)allocate and
 * initialize the space. Otherwise, if the new extents are being
 * inserted into the middle of the existing entries, a bit more work
 * is required to make room for the new extents to be inserted. The
 * caller is responsible for filling in the new extent entries upon
 * return.
 */
void
xfs_iext_add(
	xfs_ifork_t	*ifp,		/* inode fork pointer */
	xfs_extnum_t	idx,		/* index to begin adding exts */
3186
	int		ext_diff)	/* number of extents to add */
3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209
{
	int		byte_diff;	/* new bytes being added */
	int		new_size;	/* size of extents after adding */
	xfs_extnum_t	nextents;	/* number of extents in file */

	nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
	ASSERT((idx >= 0) && (idx <= nextents));
	byte_diff = ext_diff * sizeof(xfs_bmbt_rec_t);
	new_size = ifp->if_bytes + byte_diff;
	/*
	 * If the new number of extents (nextents + ext_diff)
	 * fits inside the inode, then continue to use the inline
	 * extent buffer.
	 */
	if (nextents + ext_diff <= XFS_INLINE_EXTS) {
		if (idx < nextents) {
			memmove(&ifp->if_u2.if_inline_ext[idx + ext_diff],
				&ifp->if_u2.if_inline_ext[idx],
				(nextents - idx) * sizeof(xfs_bmbt_rec_t));
			memset(&ifp->if_u2.if_inline_ext[idx], 0, byte_diff);
		}
		ifp->if_u1.if_extents = ifp->if_u2.if_inline_ext;
		ifp->if_real_bytes = 0;
3210
		ifp->if_lastex = nextents + ext_diff;
3211 3212 3213 3214 3215 3216 3217
	}
	/*
	 * Otherwise use a linear (direct) extent list.
	 * If the extents are currently inside the inode,
	 * xfs_iext_realloc_direct will switch us from
	 * inline to direct extent allocation mode.
	 */
3218
	else if (nextents + ext_diff <= XFS_LINEAR_EXTS) {
3219 3220 3221 3222 3223 3224 3225 3226
		xfs_iext_realloc_direct(ifp, new_size);
		if (idx < nextents) {
			memmove(&ifp->if_u1.if_extents[idx + ext_diff],
				&ifp->if_u1.if_extents[idx],
				(nextents - idx) * sizeof(xfs_bmbt_rec_t));
			memset(&ifp->if_u1.if_extents[idx], 0, byte_diff);
		}
	}
3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276
	/* Indirection array */
	else {
		xfs_ext_irec_t	*erp;
		int		erp_idx = 0;
		int		page_idx = idx;

		ASSERT(nextents + ext_diff > XFS_LINEAR_EXTS);
		if (ifp->if_flags & XFS_IFEXTIREC) {
			erp = xfs_iext_idx_to_irec(ifp, &page_idx, &erp_idx, 1);
		} else {
			xfs_iext_irec_init(ifp);
			ASSERT(ifp->if_flags & XFS_IFEXTIREC);
			erp = ifp->if_u1.if_ext_irec;
		}
		/* Extents fit in target extent page */
		if (erp && erp->er_extcount + ext_diff <= XFS_LINEAR_EXTS) {
			if (page_idx < erp->er_extcount) {
				memmove(&erp->er_extbuf[page_idx + ext_diff],
					&erp->er_extbuf[page_idx],
					(erp->er_extcount - page_idx) *
					sizeof(xfs_bmbt_rec_t));
				memset(&erp->er_extbuf[page_idx], 0, byte_diff);
			}
			erp->er_extcount += ext_diff;
			xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, ext_diff);
		}
		/* Insert a new extent page */
		else if (erp) {
			xfs_iext_add_indirect_multi(ifp,
				erp_idx, page_idx, ext_diff);
		}
		/*
		 * If extent(s) are being appended to the last page in
		 * the indirection array and the new extent(s) don't fit
		 * in the page, then erp is NULL and erp_idx is set to
		 * the next index needed in the indirection array.
		 */
		else {
			int	count = ext_diff;

			while (count) {
				erp = xfs_iext_irec_new(ifp, erp_idx);
				erp->er_extcount = count;
				count -= MIN(count, (int)XFS_LINEAR_EXTS);
				if (count) {
					erp_idx++;
				}
			}
		}
	}
3277 3278 3279
	ifp->if_bytes = new_size;
}

3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320
/*
 * This is called when incore extents are being added to the indirection
 * array and the new extents do not fit in the target extent list. The
 * erp_idx parameter contains the irec index for the target extent list
 * in the indirection array, and the idx parameter contains the extent
 * index within the list. The number of extents being added is stored
 * in the count parameter.
 *
 *    |-------|   |-------|
 *    |       |   |       |    idx - number of extents before idx
 *    |  idx  |   | count |
 *    |       |   |       |    count - number of extents being inserted at idx
 *    |-------|   |-------|
 *    | count |   | nex2  |    nex2 - number of extents after idx + count
 *    |-------|   |-------|
 */
void
xfs_iext_add_indirect_multi(
	xfs_ifork_t	*ifp,			/* inode fork pointer */
	int		erp_idx,		/* target extent irec index */
	xfs_extnum_t	idx,			/* index within target list */
	int		count)			/* new extents being added */
{
	int		byte_diff;		/* new bytes being added */
	xfs_ext_irec_t	*erp;			/* pointer to irec entry */
	xfs_extnum_t	ext_diff;		/* number of extents to add */
	xfs_extnum_t	ext_cnt;		/* new extents still needed */
	xfs_extnum_t	nex2;			/* extents after idx + count */
	xfs_bmbt_rec_t	*nex2_ep = NULL;	/* temp list for nex2 extents */
	int		nlists;			/* number of irec's (lists) */

	ASSERT(ifp->if_flags & XFS_IFEXTIREC);
	erp = &ifp->if_u1.if_ext_irec[erp_idx];
	nex2 = erp->er_extcount - idx;
	nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;

	/*
	 * Save second part of target extent list
	 * (all extents past */
	if (nex2) {
		byte_diff = nex2 * sizeof(xfs_bmbt_rec_t);
3321
		nex2_ep = (xfs_bmbt_rec_t *) kmem_alloc(byte_diff, KM_NOFS);
3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386
		memmove(nex2_ep, &erp->er_extbuf[idx], byte_diff);
		erp->er_extcount -= nex2;
		xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, -nex2);
		memset(&erp->er_extbuf[idx], 0, byte_diff);
	}

	/*
	 * Add the new extents to the end of the target
	 * list, then allocate new irec record(s) and
	 * extent buffer(s) as needed to store the rest
	 * of the new extents.
	 */
	ext_cnt = count;
	ext_diff = MIN(ext_cnt, (int)XFS_LINEAR_EXTS - erp->er_extcount);
	if (ext_diff) {
		erp->er_extcount += ext_diff;
		xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, ext_diff);
		ext_cnt -= ext_diff;
	}
	while (ext_cnt) {
		erp_idx++;
		erp = xfs_iext_irec_new(ifp, erp_idx);
		ext_diff = MIN(ext_cnt, (int)XFS_LINEAR_EXTS);
		erp->er_extcount = ext_diff;
		xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, ext_diff);
		ext_cnt -= ext_diff;
	}

	/* Add nex2 extents back to indirection array */
	if (nex2) {
		xfs_extnum_t	ext_avail;
		int		i;

		byte_diff = nex2 * sizeof(xfs_bmbt_rec_t);
		ext_avail = XFS_LINEAR_EXTS - erp->er_extcount;
		i = 0;
		/*
		 * If nex2 extents fit in the current page, append
		 * nex2_ep after the new extents.
		 */
		if (nex2 <= ext_avail) {
			i = erp->er_extcount;
		}
		/*
		 * Otherwise, check if space is available in the
		 * next page.
		 */
		else if ((erp_idx < nlists - 1) &&
			 (nex2 <= (ext_avail = XFS_LINEAR_EXTS -
			  ifp->if_u1.if_ext_irec[erp_idx+1].er_extcount))) {
			erp_idx++;
			erp++;
			/* Create a hole for nex2 extents */
			memmove(&erp->er_extbuf[nex2], erp->er_extbuf,
				erp->er_extcount * sizeof(xfs_bmbt_rec_t));
		}
		/*
		 * Final choice, create a new extent page for
		 * nex2 extents.
		 */
		else {
			erp_idx++;
			erp = xfs_iext_irec_new(ifp, erp_idx);
		}
		memmove(&erp->er_extbuf[i], nex2_ep, byte_diff);
3387
		kmem_free(nex2_ep);
3388 3389 3390 3391 3392
		erp->er_extcount += nex2;
		xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, nex2);
	}
}

3393 3394 3395 3396 3397
/*
 * This is called when the amount of space required for incore file
 * extents needs to be decreased. The ext_diff parameter stores the
 * number of extents to be removed and the idx parameter contains
 * the extent index where the extents will be removed from.
3398 3399 3400 3401 3402
 *
 * If the amount of space needed has decreased below the linear
 * limit, XFS_IEXT_BUFSZ, then switch to using the contiguous
 * extent array.  Otherwise, use kmem_realloc() to adjust the
 * size to what is needed.
3403 3404 3405
 */
void
xfs_iext_remove(
3406
	xfs_inode_t	*ip,		/* incore inode pointer */
3407
	xfs_extnum_t	idx,		/* index to begin removing exts */
3408 3409
	int		ext_diff,	/* number of extents to remove */
	int		state)		/* type of extent conversion */
3410
{
3411
	xfs_ifork_t	*ifp = (state & BMAP_ATTRFORK) ? ip->i_afp : &ip->i_df;
3412 3413 3414
	xfs_extnum_t	nextents;	/* number of extents in file */
	int		new_size;	/* size of extents after removal */

C
Christoph Hellwig 已提交
3415 3416
	trace_xfs_iext_remove(ip, idx, state, _RET_IP_);

3417 3418 3419 3420 3421 3422
	ASSERT(ext_diff > 0);
	nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
	new_size = (nextents - ext_diff) * sizeof(xfs_bmbt_rec_t);

	if (new_size == 0) {
		xfs_iext_destroy(ifp);
3423 3424
	} else if (ifp->if_flags & XFS_IFEXTIREC) {
		xfs_iext_remove_indirect(ifp, idx, ext_diff);
3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440 3441 3442 3443 3444
	} else if (ifp->if_real_bytes) {
		xfs_iext_remove_direct(ifp, idx, ext_diff);
	} else {
		xfs_iext_remove_inline(ifp, idx, ext_diff);
	}
	ifp->if_bytes = new_size;
}

/*
 * This removes ext_diff extents from the inline buffer, beginning
 * at extent index idx.
 */
void
xfs_iext_remove_inline(
	xfs_ifork_t	*ifp,		/* inode fork pointer */
	xfs_extnum_t	idx,		/* index to begin removing exts */
	int		ext_diff)	/* number of extents to remove */
{
	int		nextents;	/* number of extents in file */

3445
	ASSERT(!(ifp->if_flags & XFS_IFEXTIREC));
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
	ASSERT(idx < XFS_INLINE_EXTS);
	nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
	ASSERT(((nextents - ext_diff) > 0) &&
		(nextents - ext_diff) < XFS_INLINE_EXTS);

	if (idx + ext_diff < nextents) {
		memmove(&ifp->if_u2.if_inline_ext[idx],
			&ifp->if_u2.if_inline_ext[idx + ext_diff],
			(nextents - (idx + ext_diff)) *
			 sizeof(xfs_bmbt_rec_t));
		memset(&ifp->if_u2.if_inline_ext[nextents - ext_diff],
			0, ext_diff * sizeof(xfs_bmbt_rec_t));
	} else {
		memset(&ifp->if_u2.if_inline_ext[idx], 0,
			ext_diff * sizeof(xfs_bmbt_rec_t));
	}
}

/*
 * This removes ext_diff extents from a linear (direct) extent list,
 * beginning at extent index idx. If the extents are being removed
 * from the end of the list (ie. truncate) then we just need to re-
 * allocate the list to remove the extra space. Otherwise, if the
 * extents are being removed from the middle of the existing extent
 * entries, then we first need to move the extent records beginning
 * at idx + ext_diff up in the list to overwrite the records being
 * removed, then remove the extra space via kmem_realloc.
 */
void
xfs_iext_remove_direct(
	xfs_ifork_t	*ifp,		/* inode fork pointer */
	xfs_extnum_t	idx,		/* index to begin removing exts */
	int		ext_diff)	/* number of extents to remove */
{
	xfs_extnum_t	nextents;	/* number of extents in file */
	int		new_size;	/* size of extents after removal */

3483
	ASSERT(!(ifp->if_flags & XFS_IFEXTIREC));
3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494 3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 3510
	new_size = ifp->if_bytes -
		(ext_diff * sizeof(xfs_bmbt_rec_t));
	nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);

	if (new_size == 0) {
		xfs_iext_destroy(ifp);
		return;
	}
	/* Move extents up in the list (if needed) */
	if (idx + ext_diff < nextents) {
		memmove(&ifp->if_u1.if_extents[idx],
			&ifp->if_u1.if_extents[idx + ext_diff],
			(nextents - (idx + ext_diff)) *
			 sizeof(xfs_bmbt_rec_t));
	}
	memset(&ifp->if_u1.if_extents[nextents - ext_diff],
		0, ext_diff * sizeof(xfs_bmbt_rec_t));
	/*
	 * Reallocate the direct extent list. If the extents
	 * will fit inside the inode then xfs_iext_realloc_direct
	 * will switch from direct to inline extent allocation
	 * mode for us.
	 */
	xfs_iext_realloc_direct(ifp, new_size);
	ifp->if_bytes = new_size;
}

3511 3512 3513 3514 3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533 3534 3535 3536 3537
/*
 * This is called when incore extents are being removed from the
 * indirection array and the extents being removed span multiple extent
 * buffers. The idx parameter contains the file extent index where we
 * want to begin removing extents, and the count parameter contains
 * how many extents need to be removed.
 *
 *    |-------|   |-------|
 *    | nex1  |   |       |    nex1 - number of extents before idx
 *    |-------|   | count |
 *    |       |   |       |    count - number of extents being removed at idx
 *    | count |   |-------|
 *    |       |   | nex2  |    nex2 - number of extents after idx + count
 *    |-------|   |-------|
 */
void
xfs_iext_remove_indirect(
	xfs_ifork_t	*ifp,		/* inode fork pointer */
	xfs_extnum_t	idx,		/* index to begin removing extents */
	int		count)		/* number of extents to remove */
{
	xfs_ext_irec_t	*erp;		/* indirection array pointer */
	int		erp_idx = 0;	/* indirection array index */
	xfs_extnum_t	ext_cnt;	/* extents left to remove */
	xfs_extnum_t	ext_diff;	/* extents to remove in current list */
	xfs_extnum_t	nex1;		/* number of extents before idx */
	xfs_extnum_t	nex2;		/* extents after idx + count */
3538
	int		nlists;		/* entries in indirection array */
3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576 3577 3578 3579 3580 3581 3582 3583 3584 3585 3586 3587 3588
	int		page_idx = idx;	/* index in target extent list */

	ASSERT(ifp->if_flags & XFS_IFEXTIREC);
	erp = xfs_iext_idx_to_irec(ifp,  &page_idx, &erp_idx, 0);
	ASSERT(erp != NULL);
	nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
	nex1 = page_idx;
	ext_cnt = count;
	while (ext_cnt) {
		nex2 = MAX((erp->er_extcount - (nex1 + ext_cnt)), 0);
		ext_diff = MIN(ext_cnt, (erp->er_extcount - nex1));
		/*
		 * Check for deletion of entire list;
		 * xfs_iext_irec_remove() updates extent offsets.
		 */
		if (ext_diff == erp->er_extcount) {
			xfs_iext_irec_remove(ifp, erp_idx);
			ext_cnt -= ext_diff;
			nex1 = 0;
			if (ext_cnt) {
				ASSERT(erp_idx < ifp->if_real_bytes /
					XFS_IEXT_BUFSZ);
				erp = &ifp->if_u1.if_ext_irec[erp_idx];
				nex1 = 0;
				continue;
			} else {
				break;
			}
		}
		/* Move extents up (if needed) */
		if (nex2) {
			memmove(&erp->er_extbuf[nex1],
				&erp->er_extbuf[nex1 + ext_diff],
				nex2 * sizeof(xfs_bmbt_rec_t));
		}
		/* Zero out rest of page */
		memset(&erp->er_extbuf[nex1 + nex2], 0, (XFS_IEXT_BUFSZ -
			((nex1 + nex2) * sizeof(xfs_bmbt_rec_t))));
		/* Update remaining counters */
		erp->er_extcount -= ext_diff;
		xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, -ext_diff);
		ext_cnt -= ext_diff;
		nex1 = 0;
		erp_idx++;
		erp++;
	}
	ifp->if_bytes -= count * sizeof(xfs_bmbt_rec_t);
	xfs_iext_irec_compact(ifp);
}

3589 3590 3591 3592 3593 3594 3595 3596 3597 3598 3599 3600
/*
 * Create, destroy, or resize a linear (direct) block of extents.
 */
void
xfs_iext_realloc_direct(
	xfs_ifork_t	*ifp,		/* inode fork pointer */
	int		new_size)	/* new size of extents */
{
	int		rnew_size;	/* real new size of extents */

	rnew_size = new_size;

3601 3602 3603 3604
	ASSERT(!(ifp->if_flags & XFS_IFEXTIREC) ||
		((new_size >= 0) && (new_size <= XFS_IEXT_BUFSZ) &&
		 (new_size != ifp->if_real_bytes)));

3605 3606 3607 3608 3609 3610 3611 3612 3613 3614 3615 3616 3617
	/* Free extent records */
	if (new_size == 0) {
		xfs_iext_destroy(ifp);
	}
	/* Resize direct extent list and zero any new bytes */
	else if (ifp->if_real_bytes) {
		/* Check if extents will fit inside the inode */
		if (new_size <= XFS_INLINE_EXTS * sizeof(xfs_bmbt_rec_t)) {
			xfs_iext_direct_to_inline(ifp, new_size /
				(uint)sizeof(xfs_bmbt_rec_t));
			ifp->if_bytes = new_size;
			return;
		}
3618
		if (!is_power_of_2(new_size)){
3619
			rnew_size = roundup_pow_of_two(new_size);
3620 3621
		}
		if (rnew_size != ifp->if_real_bytes) {
3622
			ifp->if_u1.if_extents =
3623 3624
				kmem_realloc(ifp->if_u1.if_extents,
						rnew_size,
3625
						ifp->if_real_bytes, KM_NOFS);
3626 3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637 3638 3639
		}
		if (rnew_size > ifp->if_real_bytes) {
			memset(&ifp->if_u1.if_extents[ifp->if_bytes /
				(uint)sizeof(xfs_bmbt_rec_t)], 0,
				rnew_size - ifp->if_real_bytes);
		}
	}
	/*
	 * Switch from the inline extent buffer to a direct
	 * extent list. Be sure to include the inline extent
	 * bytes in new_size.
	 */
	else {
		new_size += ifp->if_bytes;
3640
		if (!is_power_of_2(new_size)) {
3641
			rnew_size = roundup_pow_of_two(new_size);
3642 3643 3644 3645 3646 3647 3648 3649 3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663 3664 3665
		}
		xfs_iext_inline_to_direct(ifp, rnew_size);
	}
	ifp->if_real_bytes = rnew_size;
	ifp->if_bytes = new_size;
}

/*
 * Switch from linear (direct) extent records to inline buffer.
 */
void
xfs_iext_direct_to_inline(
	xfs_ifork_t	*ifp,		/* inode fork pointer */
	xfs_extnum_t	nextents)	/* number of extents in file */
{
	ASSERT(ifp->if_flags & XFS_IFEXTENTS);
	ASSERT(nextents <= XFS_INLINE_EXTS);
	/*
	 * The inline buffer was zeroed when we switched
	 * from inline to direct extent allocation mode,
	 * so we don't need to clear it here.
	 */
	memcpy(ifp->if_u2.if_inline_ext, ifp->if_u1.if_extents,
		nextents * sizeof(xfs_bmbt_rec_t));
3666
	kmem_free(ifp->if_u1.if_extents);
3667 3668 3669 3670 3671 3672 3673 3674 3675 3676 3677 3678 3679 3680 3681 3682 3683
	ifp->if_u1.if_extents = ifp->if_u2.if_inline_ext;
	ifp->if_real_bytes = 0;
}

/*
 * Switch from inline buffer to linear (direct) extent records.
 * new_size should already be rounded up to the next power of 2
 * by the caller (when appropriate), so use new_size as it is.
 * However, since new_size may be rounded up, we can't update
 * if_bytes here. It is the caller's responsibility to update
 * if_bytes upon return.
 */
void
xfs_iext_inline_to_direct(
	xfs_ifork_t	*ifp,		/* inode fork pointer */
	int		new_size)	/* number of extents in file */
{
3684
	ifp->if_u1.if_extents = kmem_alloc(new_size, KM_NOFS);
3685 3686 3687 3688 3689 3690 3691 3692 3693 3694
	memset(ifp->if_u1.if_extents, 0, new_size);
	if (ifp->if_bytes) {
		memcpy(ifp->if_u1.if_extents, ifp->if_u2.if_inline_ext,
			ifp->if_bytes);
		memset(ifp->if_u2.if_inline_ext, 0, XFS_INLINE_EXTS *
			sizeof(xfs_bmbt_rec_t));
	}
	ifp->if_real_bytes = new_size;
}

3695 3696 3697
/*
 * Resize an extent indirection array to new_size bytes.
 */
3698
STATIC void
3699 3700 3701 3702 3703 3704 3705 3706 3707 3708 3709 3710 3711 3712 3713 3714 3715
xfs_iext_realloc_indirect(
	xfs_ifork_t	*ifp,		/* inode fork pointer */
	int		new_size)	/* new indirection array size */
{
	int		nlists;		/* number of irec's (ex lists) */
	int		size;		/* current indirection array size */

	ASSERT(ifp->if_flags & XFS_IFEXTIREC);
	nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
	size = nlists * sizeof(xfs_ext_irec_t);
	ASSERT(ifp->if_real_bytes);
	ASSERT((new_size >= 0) && (new_size != size));
	if (new_size == 0) {
		xfs_iext_destroy(ifp);
	} else {
		ifp->if_u1.if_ext_irec = (xfs_ext_irec_t *)
			kmem_realloc(ifp->if_u1.if_ext_irec,
3716
				new_size, size, KM_NOFS);
3717 3718 3719 3720 3721 3722
	}
}

/*
 * Switch from indirection array to linear (direct) extent allocations.
 */
3723
STATIC void
3724 3725 3726
xfs_iext_indirect_to_direct(
	 xfs_ifork_t	*ifp)		/* inode fork pointer */
{
3727
	xfs_bmbt_rec_host_t *ep;	/* extent record pointer */
3728 3729 3730 3731 3732 3733 3734 3735
	xfs_extnum_t	nextents;	/* number of extents in file */
	int		size;		/* size of file extents */

	ASSERT(ifp->if_flags & XFS_IFEXTIREC);
	nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
	ASSERT(nextents <= XFS_LINEAR_EXTS);
	size = nextents * sizeof(xfs_bmbt_rec_t);

3736
	xfs_iext_irec_compact_pages(ifp);
3737 3738 3739
	ASSERT(ifp->if_real_bytes == XFS_IEXT_BUFSZ);

	ep = ifp->if_u1.if_ext_irec->er_extbuf;
3740
	kmem_free(ifp->if_u1.if_ext_irec);
3741 3742 3743 3744 3745 3746 3747 3748
	ifp->if_flags &= ~XFS_IFEXTIREC;
	ifp->if_u1.if_extents = ep;
	ifp->if_bytes = size;
	if (nextents < XFS_LINEAR_EXTS) {
		xfs_iext_realloc_direct(ifp, size);
	}
}

3749 3750 3751 3752 3753 3754 3755
/*
 * Free incore file extents.
 */
void
xfs_iext_destroy(
	xfs_ifork_t	*ifp)		/* inode fork pointer */
{
3756 3757 3758 3759 3760 3761 3762 3763 3764 3765
	if (ifp->if_flags & XFS_IFEXTIREC) {
		int	erp_idx;
		int	nlists;

		nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
		for (erp_idx = nlists - 1; erp_idx >= 0 ; erp_idx--) {
			xfs_iext_irec_remove(ifp, erp_idx);
		}
		ifp->if_flags &= ~XFS_IFEXTIREC;
	} else if (ifp->if_real_bytes) {
3766
		kmem_free(ifp->if_u1.if_extents);
3767 3768 3769 3770 3771 3772 3773 3774
	} else if (ifp->if_bytes) {
		memset(ifp->if_u2.if_inline_ext, 0, XFS_INLINE_EXTS *
			sizeof(xfs_bmbt_rec_t));
	}
	ifp->if_u1.if_extents = NULL;
	ifp->if_real_bytes = 0;
	ifp->if_bytes = 0;
}
3775

3776 3777 3778
/*
 * Return a pointer to the extent record for file system block bno.
 */
3779
xfs_bmbt_rec_host_t *			/* pointer to found extent record */
3780 3781 3782 3783 3784
xfs_iext_bno_to_ext(
	xfs_ifork_t	*ifp,		/* inode fork pointer */
	xfs_fileoff_t	bno,		/* block number to search for */
	xfs_extnum_t	*idxp)		/* index of target extent */
{
3785
	xfs_bmbt_rec_host_t *base;	/* pointer to first extent */
3786
	xfs_filblks_t	blockcount = 0;	/* number of blocks in extent */
3787
	xfs_bmbt_rec_host_t *ep = NULL;	/* pointer to target extent */
3788
	xfs_ext_irec_t	*erp = NULL;	/* indirection array pointer */
3789
	int		high;		/* upper boundary in search */
3790
	xfs_extnum_t	idx = 0;	/* index of target extent */
3791
	int		low;		/* lower boundary in search */
3792 3793 3794 3795 3796 3797 3798 3799 3800 3801 3802 3803 3804 3805 3806 3807 3808 3809 3810 3811 3812 3813 3814 3815 3816 3817 3818 3819 3820 3821 3822 3823 3824 3825 3826 3827 3828 3829 3830 3831 3832 3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 3843 3844
	xfs_extnum_t	nextents;	/* number of file extents */
	xfs_fileoff_t	startoff = 0;	/* start offset of extent */

	nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
	if (nextents == 0) {
		*idxp = 0;
		return NULL;
	}
	low = 0;
	if (ifp->if_flags & XFS_IFEXTIREC) {
		/* Find target extent list */
		int	erp_idx = 0;
		erp = xfs_iext_bno_to_irec(ifp, bno, &erp_idx);
		base = erp->er_extbuf;
		high = erp->er_extcount - 1;
	} else {
		base = ifp->if_u1.if_extents;
		high = nextents - 1;
	}
	/* Binary search extent records */
	while (low <= high) {
		idx = (low + high) >> 1;
		ep = base + idx;
		startoff = xfs_bmbt_get_startoff(ep);
		blockcount = xfs_bmbt_get_blockcount(ep);
		if (bno < startoff) {
			high = idx - 1;
		} else if (bno >= startoff + blockcount) {
			low = idx + 1;
		} else {
			/* Convert back to file-based extent index */
			if (ifp->if_flags & XFS_IFEXTIREC) {
				idx += erp->er_extoff;
			}
			*idxp = idx;
			return ep;
		}
	}
	/* Convert back to file-based extent index */
	if (ifp->if_flags & XFS_IFEXTIREC) {
		idx += erp->er_extoff;
	}
	if (bno >= startoff + blockcount) {
		if (++idx == nextents) {
			ep = NULL;
		} else {
			ep = xfs_iext_get_ext(ifp, idx);
		}
	}
	*idxp = idx;
	return ep;
}

3845 3846 3847 3848 3849
/*
 * Return a pointer to the indirection array entry containing the
 * extent record for filesystem block bno. Store the index of the
 * target irec in *erp_idxp.
 */
3850
xfs_ext_irec_t *			/* pointer to found extent record */
3851 3852 3853 3854 3855 3856 3857
xfs_iext_bno_to_irec(
	xfs_ifork_t	*ifp,		/* inode fork pointer */
	xfs_fileoff_t	bno,		/* block number to search for */
	int		*erp_idxp)	/* irec index of target ext list */
{
	xfs_ext_irec_t	*erp = NULL;	/* indirection array pointer */
	xfs_ext_irec_t	*erp_next;	/* next indirection array entry */
3858
	int		erp_idx;	/* indirection array index */
3859 3860 3861 3862 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 3888 3889 3890 3891 3892 3893 3894 3895 3896 3897 3898 3899 3900 3901 3902 3903 3904 3905 3906 3907 3908 3909 3910 3911 3912 3913 3914 3915 3916 3917 3918 3919 3920 3921 3922 3923 3924 3925 3926 3927 3928 3929 3930 3931 3932 3933 3934 3935 3936 3937 3938 3939 3940 3941 3942 3943 3944 3945 3946 3947 3948 3949 3950 3951 3952 3953 3954 3955 3956 3957
	int		nlists;		/* number of extent irec's (lists) */
	int		high;		/* binary search upper limit */
	int		low;		/* binary search lower limit */

	ASSERT(ifp->if_flags & XFS_IFEXTIREC);
	nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
	erp_idx = 0;
	low = 0;
	high = nlists - 1;
	while (low <= high) {
		erp_idx = (low + high) >> 1;
		erp = &ifp->if_u1.if_ext_irec[erp_idx];
		erp_next = erp_idx < nlists - 1 ? erp + 1 : NULL;
		if (bno < xfs_bmbt_get_startoff(erp->er_extbuf)) {
			high = erp_idx - 1;
		} else if (erp_next && bno >=
			   xfs_bmbt_get_startoff(erp_next->er_extbuf)) {
			low = erp_idx + 1;
		} else {
			break;
		}
	}
	*erp_idxp = erp_idx;
	return erp;
}

/*
 * Return a pointer to the indirection array entry containing the
 * extent record at file extent index *idxp. Store the index of the
 * target irec in *erp_idxp and store the page index of the target
 * extent record in *idxp.
 */
xfs_ext_irec_t *
xfs_iext_idx_to_irec(
	xfs_ifork_t	*ifp,		/* inode fork pointer */
	xfs_extnum_t	*idxp,		/* extent index (file -> page) */
	int		*erp_idxp,	/* pointer to target irec */
	int		realloc)	/* new bytes were just added */
{
	xfs_ext_irec_t	*prev;		/* pointer to previous irec */
	xfs_ext_irec_t	*erp = NULL;	/* pointer to current irec */
	int		erp_idx;	/* indirection array index */
	int		nlists;		/* number of irec's (ex lists) */
	int		high;		/* binary search upper limit */
	int		low;		/* binary search lower limit */
	xfs_extnum_t	page_idx = *idxp; /* extent index in target list */

	ASSERT(ifp->if_flags & XFS_IFEXTIREC);
	ASSERT(page_idx >= 0 && page_idx <=
		ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t));
	nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
	erp_idx = 0;
	low = 0;
	high = nlists - 1;

	/* Binary search extent irec's */
	while (low <= high) {
		erp_idx = (low + high) >> 1;
		erp = &ifp->if_u1.if_ext_irec[erp_idx];
		prev = erp_idx > 0 ? erp - 1 : NULL;
		if (page_idx < erp->er_extoff || (page_idx == erp->er_extoff &&
		     realloc && prev && prev->er_extcount < XFS_LINEAR_EXTS)) {
			high = erp_idx - 1;
		} else if (page_idx > erp->er_extoff + erp->er_extcount ||
			   (page_idx == erp->er_extoff + erp->er_extcount &&
			    !realloc)) {
			low = erp_idx + 1;
		} else if (page_idx == erp->er_extoff + erp->er_extcount &&
			   erp->er_extcount == XFS_LINEAR_EXTS) {
			ASSERT(realloc);
			page_idx = 0;
			erp_idx++;
			erp = erp_idx < nlists ? erp + 1 : NULL;
			break;
		} else {
			page_idx -= erp->er_extoff;
			break;
		}
	}
	*idxp = page_idx;
	*erp_idxp = erp_idx;
	return(erp);
}

/*
 * Allocate and initialize an indirection array once the space needed
 * for incore extents increases above XFS_IEXT_BUFSZ.
 */
void
xfs_iext_irec_init(
	xfs_ifork_t	*ifp)		/* inode fork pointer */
{
	xfs_ext_irec_t	*erp;		/* indirection array pointer */
	xfs_extnum_t	nextents;	/* number of extents in file */

	ASSERT(!(ifp->if_flags & XFS_IFEXTIREC));
	nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
	ASSERT(nextents <= XFS_LINEAR_EXTS);

3958
	erp = kmem_alloc(sizeof(xfs_ext_irec_t), KM_NOFS);
3959 3960

	if (nextents == 0) {
3961
		ifp->if_u1.if_extents = kmem_alloc(XFS_IEXT_BUFSZ, KM_NOFS);
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	} else if (!ifp->if_real_bytes) {
		xfs_iext_inline_to_direct(ifp, XFS_IEXT_BUFSZ);
	} else if (ifp->if_real_bytes < XFS_IEXT_BUFSZ) {
		xfs_iext_realloc_direct(ifp, XFS_IEXT_BUFSZ);
	}
	erp->er_extbuf = ifp->if_u1.if_extents;
	erp->er_extcount = nextents;
	erp->er_extoff = 0;

	ifp->if_flags |= XFS_IFEXTIREC;
	ifp->if_real_bytes = XFS_IEXT_BUFSZ;
	ifp->if_bytes = nextents * sizeof(xfs_bmbt_rec_t);
	ifp->if_u1.if_ext_irec = erp;

	return;
}

/*
 * Allocate and initialize a new entry in the indirection array.
 */
xfs_ext_irec_t *
xfs_iext_irec_new(
	xfs_ifork_t	*ifp,		/* inode fork pointer */
	int		erp_idx)	/* index for new irec */
{
	xfs_ext_irec_t	*erp;		/* indirection array pointer */
	int		i;		/* loop counter */
	int		nlists;		/* number of irec's (ex lists) */

	ASSERT(ifp->if_flags & XFS_IFEXTIREC);
	nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;

	/* Resize indirection array */
	xfs_iext_realloc_indirect(ifp, ++nlists *
				  sizeof(xfs_ext_irec_t));
	/*
	 * Move records down in the array so the
	 * new page can use erp_idx.
	 */
	erp = ifp->if_u1.if_ext_irec;
	for (i = nlists - 1; i > erp_idx; i--) {
		memmove(&erp[i], &erp[i-1], sizeof(xfs_ext_irec_t));
	}
	ASSERT(i == erp_idx);

	/* Initialize new extent record */
	erp = ifp->if_u1.if_ext_irec;
4009
	erp[erp_idx].er_extbuf = kmem_alloc(XFS_IEXT_BUFSZ, KM_NOFS);
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	ifp->if_real_bytes = nlists * XFS_IEXT_BUFSZ;
	memset(erp[erp_idx].er_extbuf, 0, XFS_IEXT_BUFSZ);
	erp[erp_idx].er_extcount = 0;
	erp[erp_idx].er_extoff = erp_idx > 0 ?
		erp[erp_idx-1].er_extoff + erp[erp_idx-1].er_extcount : 0;
	return (&erp[erp_idx]);
}

/*
 * Remove a record from the indirection array.
 */
void
xfs_iext_irec_remove(
	xfs_ifork_t	*ifp,		/* inode fork pointer */
	int		erp_idx)	/* irec index to remove */
{
	xfs_ext_irec_t	*erp;		/* indirection array pointer */
	int		i;		/* loop counter */
	int		nlists;		/* number of irec's (ex lists) */

	ASSERT(ifp->if_flags & XFS_IFEXTIREC);
	nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
	erp = &ifp->if_u1.if_ext_irec[erp_idx];
	if (erp->er_extbuf) {
		xfs_iext_irec_update_extoffs(ifp, erp_idx + 1,
			-erp->er_extcount);
4036
		kmem_free(erp->er_extbuf);
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	}
	/* Compact extent records */
	erp = ifp->if_u1.if_ext_irec;
	for (i = erp_idx; i < nlists - 1; i++) {
		memmove(&erp[i], &erp[i+1], sizeof(xfs_ext_irec_t));
	}
	/*
	 * Manually free the last extent record from the indirection
	 * array.  A call to xfs_iext_realloc_indirect() with a size
	 * of zero would result in a call to xfs_iext_destroy() which
	 * would in turn call this function again, creating a nasty
	 * infinite loop.
	 */
	if (--nlists) {
		xfs_iext_realloc_indirect(ifp,
			nlists * sizeof(xfs_ext_irec_t));
	} else {
4054
		kmem_free(ifp->if_u1.if_ext_irec);
4055 4056 4057 4058 4059 4060 4061 4062 4063 4064 4065 4066
	}
	ifp->if_real_bytes = nlists * XFS_IEXT_BUFSZ;
}

/*
 * This is called to clean up large amounts of unused memory allocated
 * by the indirection array.  Before compacting anything though, verify
 * that the indirection array is still needed and switch back to the
 * linear extent list (or even the inline buffer) if possible.  The
 * compaction policy is as follows:
 *
 *    Full Compaction: Extents fit into a single page (or inline buffer)
4067
 * Partial Compaction: Extents occupy less than 50% of allocated space
4068 4069 4070 4071 4072 4073 4074 4075 4076 4077 4078 4079 4080 4081 4082 4083 4084 4085 4086 4087 4088 4089 4090 4091 4092 4093 4094 4095 4096 4097 4098 4099 4100 4101 4102 4103 4104 4105 4106 4107 4108 4109 4110
 *      No Compaction: Extents occupy at least 50% of allocated space
 */
void
xfs_iext_irec_compact(
	xfs_ifork_t	*ifp)		/* inode fork pointer */
{
	xfs_extnum_t	nextents;	/* number of extents in file */
	int		nlists;		/* number of irec's (ex lists) */

	ASSERT(ifp->if_flags & XFS_IFEXTIREC);
	nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
	nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);

	if (nextents == 0) {
		xfs_iext_destroy(ifp);
	} else if (nextents <= XFS_INLINE_EXTS) {
		xfs_iext_indirect_to_direct(ifp);
		xfs_iext_direct_to_inline(ifp, nextents);
	} else if (nextents <= XFS_LINEAR_EXTS) {
		xfs_iext_indirect_to_direct(ifp);
	} else if (nextents < (nlists * XFS_LINEAR_EXTS) >> 1) {
		xfs_iext_irec_compact_pages(ifp);
	}
}

/*
 * Combine extents from neighboring extent pages.
 */
void
xfs_iext_irec_compact_pages(
	xfs_ifork_t	*ifp)		/* inode fork pointer */
{
	xfs_ext_irec_t	*erp, *erp_next;/* pointers to irec entries */
	int		erp_idx = 0;	/* indirection array index */
	int		nlists;		/* number of irec's (ex lists) */

	ASSERT(ifp->if_flags & XFS_IFEXTIREC);
	nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
	while (erp_idx < nlists - 1) {
		erp = &ifp->if_u1.if_ext_irec[erp_idx];
		erp_next = erp + 1;
		if (erp_next->er_extcount <=
		    (XFS_LINEAR_EXTS - erp->er_extcount)) {
4111
			memcpy(&erp->er_extbuf[erp->er_extcount],
4112 4113 4114 4115 4116 4117 4118 4119
				erp_next->er_extbuf, erp_next->er_extcount *
				sizeof(xfs_bmbt_rec_t));
			erp->er_extcount += erp_next->er_extcount;
			/*
			 * Free page before removing extent record
			 * so er_extoffs don't get modified in
			 * xfs_iext_irec_remove.
			 */
4120
			kmem_free(erp_next->er_extbuf);
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			erp_next->er_extbuf = NULL;
			xfs_iext_irec_remove(ifp, erp_idx + 1);
			nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
		} else {
			erp_idx++;
		}
	}
}

/*
 * This is called to update the er_extoff field in the indirection
 * array when extents have been added or removed from one of the
 * extent lists. erp_idx contains the irec index to begin updating
 * at and ext_diff contains the number of extents that were added
 * or removed.
 */
void
xfs_iext_irec_update_extoffs(
	xfs_ifork_t	*ifp,		/* inode fork pointer */
	int		erp_idx,	/* irec index to update */
	int		ext_diff)	/* number of new extents */
{
	int		i;		/* loop counter */
	int		nlists;		/* number of irec's (ex lists */

	ASSERT(ifp->if_flags & XFS_IFEXTIREC);
	nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
	for (i = erp_idx; i < nlists; i++) {
		ifp->if_u1.if_ext_irec[i].er_extoff += ext_diff;
	}
}