[PATCH 14/18] xfs: update free inode record logic to support sparse inode records

[Brian Foster <bfoster@redhat.com>]

xfs_difree_inobt() uses logic in a couple places that assume inobt
records refer to fully allocated chunks. Specifically, the use of
mp->m_ialloc_inos can cause problems for inode chunks that are sparsely
allocated. Sparse inode chunks can, by definition, define a smaller
number of inodes than a full inode chunk.

Fix the logic that determines whether an inode record should be removed
from the inobt to use the ir_free mask rather than ir_freecount.

Fix the agi counters modification to use ir_freecount to add the actual
number of inodes freed rather than assuming a full inode chunk.

Signed-off-by: Brian Foster <bfoster@redhat.com>
---
 fs/xfs/libxfs/xfs_ialloc.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_ialloc.c b/fs/xfs/libxfs/xfs_ialloc.c
index 1d74394..f75f191 100644
--- a/fs/xfs/libxfs/xfs_ialloc.c
+++ b/fs/xfs/libxfs/xfs_ialloc.c
@@ -1724,7 +1724,7 @@ xfs_difree_inobt(
 	 * When an inode cluster is free, it becomes eligible for removal
 	 */
 	if (!(mp->m_flags & XFS_MOUNT_IKEEP) &&
-	    (rec.ir_freecount == mp->m_ialloc_inos)) {
+	    (rec.ir_free == XFS_INOBT_ALL_FREE)) {
 
 		*deleted = 1;
 		*first_ino = XFS_AGINO_TO_INO(mp, agno, rec.ir_startino);
@@ -1734,7 +1734,7 @@ xfs_difree_inobt(
 		 * AGI and Superblock inode counts, and mark the disk space
 		 * to be freed when the transaction is committed.
 		 */
-		ilen = mp->m_ialloc_inos;
+		ilen = rec.ir_freecount;
 		be32_add_cpu(&agi->agi_count, -ilen);
 		be32_add_cpu(&agi->agi_freecount, -(ilen - 1));
 		xfs_ialloc_log_agi(tp, agbp, XFS_AGI_COUNT | XFS_AGI_FREECOUNT);
@@ -1856,7 +1856,7 @@ xfs_difree_finobt(
 	 * keeping inode chunks permanently on disk, remove the record.
 	 * Otherwise, update the record with the new information.
 	 */
-	if (rec.ir_freecount == mp->m_ialloc_inos &&
+	if (rec.ir_free == XFS_INOBT_ALL_FREE &&
 	    !(mp->m_flags & XFS_MOUNT_IKEEP)) {
 		error = xfs_btree_delete(cur, &i);
 		if (error)
-- 
1.8.3.1

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