linux-kernel - [PATCH v2 0/6] fix error flag covered by journal recovery

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Message-Id: <20230210032044.146115-1-yebin@huaweicloud.com>
Date:   Fri, 10 Feb 2023 11:20:38 +0800
From:   Ye Bin <yebin@...weicloud.com>
To:     tytso@....edu, adilger.kernel@...ger.ca, linux-ext4@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, jack@...e.cz,
        Ye Bin <yebin10@...wei.com>
Subject: [PATCH v2 0/6] fix error flag covered by journal recovery

From: Ye Bin <yebin10@...wei.com>

Diff v2 vs v1:
Move call 'j_replay_prepare_callback' and 'j_replay_end_callback' from
ext4_load_journal() to jbd2_journal_recover().

When do fault injection test, got issue as follows:
EXT4-fs (dm-5): warning: mounting fs with errors, running e2fsck is recommended
EXT4-fs (dm-5): Errors on filesystem, clearing orphan list.
EXT4-fs (dm-5): recovery complete
EXT4-fs (dm-5): mounted filesystem with ordered data mode. Opts: data_err=abort,errors=remount-ro

EXT4-fs (dm-5): recovery complete
EXT4-fs (dm-5): mounted filesystem with ordered data mode. Opts: data_err=abort,errors=remount-ro

Without do file system check, file system is clean when do second mount.
Theoretically, the kernel will not clear fs error flag. In errors=remount-ro
mode the last super block is commit directly. So super block in journal is
not uptodate. When do jounral recovery, the uptodate super block will be
covered by jounral data. If super block submit all failed after recover
journal, then file system error flag is lost. When do "fsck -a" couldn't
repair file system deeply.
To solve above issue we need to do extra handle when do super block journal
recovery.

Ye Bin (6):
  jbd2: introduce callback for recovery journal
  ext4: introudce helper for jounral recover handle
  jbd2: do extra handle when do journal recovery
  ext4: remove backup for super block when recovery journal
  ext4: fix super block checksum error
  ext4: make sure fs error flag setted before clear journal error

 fs/ext4/ext4_jbd2.c  | 66 ++++++++++++++++++++++++++++++++++++++++++++
 fs/ext4/ext4_jbd2.h  |  2 ++
 fs/ext4/super.c      | 18 ++++--------
 fs/jbd2/recovery.c   | 27 ++++++++++++++++++
 include/linux/jbd2.h | 11 ++++++++
 5 files changed, 112 insertions(+), 12 deletions(-)

-- 
2.31.1