From: Baokun Li <libaokun1@xxxxxxxxxx>
And after commit 95257987a638 ("ext4: drop EXT4_MF_FS_ABORTED flag") in
v6.6-rc1, the EXT4_FLAGS_SHUTDOWN bit is set in ext4_handle_error() under
errors=remount-ro mode. This causes the read to fail even when the error
is triggered in errors=remount-ro mode.
To correct the behavior under errors=remount-ro, EXT4_FLAGS_SHUTDOWN is
replaced by the newly introduced EXT4_FLAGS_EMERGENCY_RO. This new flag
only prevents writes, matching the previous behavior with SB_RDONLY.
Fixes: 95257987a638 ("ext4: drop EXT4_MF_FS_ABORTED flag")
Closes: https://lore.kernel.org/all/22d652f6-cb3c-43f5-b2fe-0a4bb6516a04@xxxxxxxxxx/
Suggested-by: Jan Kara <jack@xxxxxxx>
Signed-off-by: Baokun Li <libaokun1@xxxxxxxxxx>
---
fs/ext4/super.c | 15 +++------------
1 file changed, 3 insertions(+), 12 deletions(-)
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index fc5d30123f22..8d9ac8770764 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -707,11 +707,8 @@ static void ext4_handle_error(struct super_block *sb, bool force_ro, int error,
if (test_opt(sb, WARN_ON_ERROR))
WARN_ON_ONCE(1);
- if (!continue_fs && !ext4_sb_rdonly(sb)) {
- set_bit(EXT4_FLAGS_SHUTDOWN, &EXT4_SB(sb)->s_ext4_flags);
- if (journal)
- jbd2_journal_abort(journal, -EIO);
- }
+ if (!continue_fs && !ext4_sb_rdonly(sb) && journal)
+ jbd2_journal_abort(journal, -EIO);
if (!bdev_read_only(sb->s_bdev)) {
save_error_info(sb, error, ino, block, func, line);
@@ -741,13 +738,7 @@ static void ext4_handle_error(struct super_block *sb, bool force_ro, int error,
return;
ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
- /*
- * EXT4_FLAGS_SHUTDOWN was set which stops all filesystem
- * modifications. We don't set SB_RDONLY because that requires
- * sb->s_umount semaphore and setting it without proper remount
- * procedure is confusing code such as freeze_super() leading to
- * deadlocks and other problems.
- */
+ set_bit(EXT4_FLAGS_EMERGENCY_RO, &EXT4_SB(sb)->s_ext4_flags);
}
static void update_super_work(struct work_struct *work)
--
2.39.2
