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xfs: create helper to check whether to free eofblocks on inode

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This check is used in multiple places to determine whether we
should check for (and potentially free) post EOF blocks on an
inode. Add a helper to consolidate the check.

Note that when we remove an inode from the cache (xfs_inactive()),
we are required to trim post-EOF blocks even if the inode is marked
preallocated or append-only to maintain correct space accounting.
The 'force' parameter to xfs_can_free_eofblocks() specifies whether
we should ignore the prealloc/append-only status of the inode.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
This commit is contained in:
Brian Foster 2012-11-06 09:50:40 -05:00 committed by Ben Myers
parent a454f7428f
commit 72b53efa4a
3 changed files with 45 additions and 12 deletions
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37
fs/xfs/xfs_inode.c
View File

@ -3912,3 +3912,40 @@ xfs_iext_irec_update_extoffs(
ifp->if_u1.if_ext_irec[i].er_extoff += ext_diff;
}
}
/*
* Test whether it is appropriate to check an inode for and free post EOF
* blocks. The 'force' parameter determines whether we should also consider
* regular files that are marked preallocated or append-only.
*/
bool
xfs_can_free_eofblocks(struct xfs_inode *ip, bool force)
{
/* prealloc/delalloc exists only on regular files */
if (!S_ISREG(ip->i_d.di_mode))
return false;
/*
* Zero sized files with no cached pages and delalloc blocks will not
* have speculative prealloc/delalloc blocks to remove.
*/
if (VFS_I(ip)->i_size == 0 &&
VN_CACHED(VFS_I(ip)) == 0 &&
ip->i_delayed_blks == 0)
return false;
/* If we haven't read in the extent list, then don't do it now. */
if (!(ip->i_df.if_flags & XFS_IFEXTENTS))
return false;
/*
* Do not free real preallocated or append-only files unless the file
* has delalloc blocks and we are forced to remove them.
*/
if (ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND))
if (!force || ip->i_delayed_blks == 0)
return false;
return true;
}

1
fs/xfs/xfs_inode.h
View File

@ -585,6 +585,7 @@ void xfs_iext_irec_compact(xfs_ifork_t *);
void xfs_iext_irec_compact_pages(xfs_ifork_t *);
void xfs_iext_irec_compact_full(xfs_ifork_t *);
void xfs_iext_irec_update_extoffs(xfs_ifork_t *, int, int);
bool xfs_can_free_eofblocks(struct xfs_inode *, bool);
#define xfs_ipincount(ip) ((unsigned int) atomic_read(&ip->i_pincount))

19
fs/xfs/xfs_vnodeops.c
View File

@ -436,11 +436,7 @@ xfs_release(
if (ip->i_d.di_nlink == 0)
return 0;
if ((S_ISREG(ip->i_d.di_mode) &&
(VFS_I(ip)->i_size > 0 ||
(VN_CACHED(VFS_I(ip)) > 0 || ip->i_delayed_blks > 0)) &&
(ip->i_df.if_flags & XFS_IFEXTENTS)) &&
(!(ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND)))) {
if (xfs_can_free_eofblocks(ip, false)) {
/*
* If we can't get the iolock just skip truncating the blocks
@ -516,13 +512,12 @@ xfs_inactive(
goto out;
if (ip->i_d.di_nlink != 0) {
if ((S_ISREG(ip->i_d.di_mode) &&
(VFS_I(ip)->i_size > 0 ||
(VN_CACHED(VFS_I(ip)) > 0 || ip->i_delayed_blks > 0)) &&
(ip->i_df.if_flags & XFS_IFEXTENTS) &&
(!(ip->i_d.di_flags &
(XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND)) ||
ip->i_delayed_blks != 0))) {
/*
* force is true because we are evicting an inode from the
* cache. Post-eof blocks must be freed, lest we end up with
* broken free space accounting.
*/
if (xfs_can_free_eofblocks(ip, true)) {
error = xfs_free_eofblocks(mp, ip, false);
if (error)
return VN_INACTIVE_CACHE;