[PATCH 4.19 07/29] ext4: dont remount read-only with errors=continue on reboot

Greg Kroah-Hartman
2021-01-05T09:30:37Z

From: Jan Kara <jack@suse.cz>

[ Upstream commit b08070eca9e247f60ab39d79b2c25d274750441f ]

ext4_handle_error() with errors=continue mount option can accidentally
remount the filesystem read-only when the system is rebooting. Fix that.

Fixes: 1dc1097ff60e ("ext4: avoid panic during forced reboot")
Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Andreas Dilger <adilger@dilger.ca>
Cc: stable@kernel.org
Link: https://lore.kernel.org/r/20201127113405.26867-2-jack@suse.cz
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/ext4/super.c | 14 ++++++--------
1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index ee96f504ed782..e9e9f09f5370d 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -454,19 +454,17 @@ static bool system_going_down(void)

static void ext4_handle_error(struct super_block *sb)
{
+ journal_t *journal = EXT4_SB(sb)->s_journal;
+
if (test_opt(sb, WARN_ON_ERROR))
WARN_ON_ONCE(1);

- if (sb_rdonly(sb))
+ if (sb_rdonly(sb) || test_opt(sb, ERRORS_CONT))
return;

- if (!test_opt(sb, ERRORS_CONT)) {
- journal_t *journal = EXT4_SB(sb)->s_journal;
-
- EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
- if (journal)
- jbd2_journal_abort(journal, -EIO);
- }
+ EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
+ if (journal)
+ jbd2_journal_abort(journal, -EIO);
/*
* We force ERRORS_RO behavior when system is rebooting. Otherwise we
* could panic during 'reboot -f' as the underlying device got already
--
2.27.0