XFS currently does not support reducing the agcount, so error out if
a logged sb buffer tries to shrink the agcount.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Brian Foster <bfoster@xxxxxxxxxx>
Reviewed-by: Darrick J. Wong <djwong@xxxxxxxxxx>
---
fs/xfs/xfs_buf_item_recover.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/fs/xfs/xfs_buf_item_recover.c b/fs/xfs/xfs_buf_item_recover.c
index edf1162a8c9dd0..a839ff5dcaa908 100644
--- a/fs/xfs/xfs_buf_item_recover.c
+++ b/fs/xfs/xfs_buf_item_recover.c
@@ -713,6 +713,11 @@ xlog_recover_do_primary_sb_buffer(
*/
xfs_sb_from_disk(&mp->m_sb, dsb);
+ if (mp->m_sb.sb_agcount < orig_agcount) {
+ xfs_alert(mp, "Shrinking AG count in log recovery not supported");
+ return -EFSCORRUPTED;
+ }
+
/*
* Initialize the new perags, and also update various block and inode
* allocator setting based off the number of AGs or total blocks.
--
2.45.2
