linux-ext4 - [PATCH v3 0/4] ext4: fix a inode checksum error

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Message-ID: <20210821065450.1397451-1-yi.zhang@huawei.com>
Date:   Sat, 21 Aug 2021 14:54:46 +0800
From:   Zhang Yi <yi.zhang@...wei.com>
To:     <linux-ext4@...r.kernel.org>
CC:     <tytso@....edu>, <adilger.kernel@...ger.ca>, <jack@...e.cz>,
        <yi.zhang@...wei.com>, <yukuai3@...wei.com>
Subject: [PATCH v3 0/4] ext4: fix a inode checksum error

We find a checksum error and a inode corruption problem while doing
stress test, this 4 patches address to fix them. The first patch is
relate to the error simulation, and the second & third patch are
prepare to do the fix. The last patch fix these two issue.

 - Checksum error

    EXT4-fs error (device sda): ext4_lookup:1784: inode #131074: comm cat: iget: checksum invalid

 - Inode corruption

    e2fsck 1.46.0 (29-Jan-2020)
    Pass 1: Checking inodes, blocks, and sizes
    Pass 2: Checking directory structure
    Entry 'foo' in / (2) has deleted/unused inode 17.  Clear<y>? yes
    Pass 3: Checking directory connectivity
    Pass 4: Checking reference counts
    Pass 5: Checking group summary information
    Inode bitmap differences:  -17
    Fix<y>? yes
    Free inodes count wrong for group #0 (32750, counted=32751).
    Fix<y>? yes
    Free inodes count wrong (32750, counted=32751).
    Fix<y>? yes


Changes since v2:
 - Instead of using WARN_ON_ONCE to prevent ext4_do_update_inode()
   return before filling the inode buffer, keep the error and postpone
   the report after the updating in the third patch.
 - Fix some language mistacks in the last patch.

Changes since v1:
 - Add a patch to prevent ext4_do_update_inode() return before filling
   the inode buffer.
 - Do not use BH_New flag to indicate the empty buffer, postpone the
   zero and uptodate logic into ext4_do_update_inode() before filling
   the inode buffer.

Thanks,
Yi.



Zhang Yi (4):
  ext4: move inode eio simulation behind io completeion
  ext4: remove an unnecessary if statement in __ext4_get_inode_loc()
  ext4: make the updating inode data procedure atomic
  ext4: prevent getting empty inode buffer

 fs/ext4/inode.c | 227 +++++++++++++++++++++++++++---------------------
 1 file changed, 126 insertions(+), 101 deletions(-)

-- 
2.31.1