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>
---
fs/xfs/xfs_log_recover.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
index 03701409c7dcd6..3b5cd240bb62ef 100644
--- a/fs/xfs/xfs_log_recover.c
+++ b/fs/xfs/xfs_log_recover.c
@@ -3343,6 +3343,10 @@ xlog_recover_update_agcount(
int error;
xfs_sb_from_disk(&mp->m_sb, dsb);
+ if (mp->m_sb.sb_agcount < old_agcount) {
+ xfs_alert(mp, "Shrinking AG count in log recovery");
+ return -EFSCORRUPTED;
+ }
error = xfs_initialize_perag(mp, old_agcount, mp->m_sb.sb_agcount,
mp->m_sb.sb_dblocks, &mp->m_maxagi);
if (error) {
--
2.45.2
