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f2fs: don't set RO when shutting down f2fs

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[ Upstream commit 3bdb7f1616 ]

Shutdown does not check the error of thaw_super due to readonly, which
causes a deadlock like below.

f2fs_ioc_shutdown(F2FS_GOING_DOWN_FULLSYNC)        issue_discard_thread
 - bdev_freeze
  - freeze_super
 - f2fs_stop_checkpoint()
  - f2fs_handle_critical_error                     - sb_start_write
    - set RO                                         - waiting
 - bdev_thaw
  - thaw_super_locked
    - return -EINVAL, if sb_rdonly()
 - f2fs_stop_discard_thread
  -> wait for kthread_stop(discard_thread);

Reported-by: "Light Hsieh (謝明燈)" <Light.Hsieh@mediatek.com>
Reviewed-by: Daeho Jeong <daehojeong@google.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jaegeuk Kim 2024-04-03 23:07:53 +00:00 committed by Greg Kroah-Hartman
parent 7196289190
commit 1036d3ea7a
1 changed files with 8 additions and 2 deletions
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10
fs/f2fs/super.c
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@ -4107,9 +4107,15 @@ void f2fs_handle_critical_error(struct f2fs_sb_info *sbi, unsigned char reason,
if (shutdown)
set_sbi_flag(sbi, SBI_IS_SHUTDOWN);
/* continue filesystem operators if errors=continue */
if (continue_fs || f2fs_readonly(sb))
/*
* Continue filesystem operators if errors=continue. Should not set
* RO by shutdown, since RO bypasses thaw_super which can hang the
* system.
*/
if (continue_fs || f2fs_readonly(sb) || shutdown) {
f2fs_warn(sbi, "Stopped filesystem due to reason: %d", reason);
return;
}
f2fs_warn(sbi, "Remounting filesystem read-only");
/*