[PATCH] ext4: preserve force-fsck requests across unmount

[Hungyu Lin]

EXT4_TUNE_FL_FORCE_FSCK sets EXT4_ERROR_FS in the on-disk superblock
but leaves s_mount_state unchanged. On a normal read-write unmount,
ext4_put_super() restores s_state from s_mount_state, clearing the
requested flag.

As a result, a successful EXT4_IOC_SET_TUNE_SB_PARAM call can be lost
before e2fsck runs: after unmount it treats the filesystem as clean
and skips the requested check.

Set EXT4_ERROR_FS in s_mount_state as well, matching the state handling
in ext4_clear_journal_err(), so later superblock updates retain the
request.

Fixes: 04a91570ac67 ("ext4: implemet new ioctls to set and get superblock parameters")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Hungyu Lin <dennylin0707@xxxxxxxxx>
---
 fs/ext4/ioctl.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index e8e579498c99..3e444e245c98 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -1384,8 +1384,10 @@ static void ext4_sb_setparams(struct ext4_sb_info *sbi,
 		    EXT4_FEATURE_INCOMPAT_CSUM_SEED)
 			es->s_checksum_seed = cpu_to_le32(sbi->s_csum_seed);
 	}
-	if (params->set_flags & EXT4_TUNE_FL_FORCE_FSCK)
+	if (params->set_flags & EXT4_TUNE_FL_FORCE_FSCK) {
+		sbi->s_mount_state |= EXT4_ERROR_FS;
 		es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
+	}
 }
 
 static int ext4_ioctl_set_tune_sb(struct file *filp,
-- 
2.43.0