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authorBrian Foster <bfoster@redhat.com>2012-11-06 18:50:40 +0400
committerBen Myers <bpm@sgi.com>2012-11-09 01:22:34 +0400
commit72b53efa4a6125a4c334871c58268c430605819a (patch)
tree8991dfdb6eb1f1abe83258cf3b6fb6617bf45fd5 /fs/xfs/xfs_inode.c
parenta454f7428ffa03c8e1321124d9074101b7290be6 (diff)
downloadlinux-72b53efa4a6125a4c334871c58268c430605819a.tar.xz
xfs: create helper to check whether to free eofblocks on inode
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>
Diffstat (limited to 'fs/xfs/xfs_inode.c')
-rw-r--r--fs/xfs/xfs_inode.c37
1 files changed, 37 insertions, 0 deletions
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 965598eb308c..7449cb943efd 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -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;
+}
+