linux-kernel - [PATCH v4 0/3] Fixes for ENOSPC xfs

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Message-Id: <20231205055900.62855-1-zhangjiachen.jaycee@bytedance.com>
Date:   Tue,  5 Dec 2023 13:58:57 +0800
From:   Jiachen Zhang <zhangjiachen.jaycee@...edance.com>
To:     Chandan Babu R <chandan.babu@...cle.com>,
        "Darrick J. Wong" <djwong@...nel.org>
Cc:     Dave Chinner <dchinner@...hat.com>,
        Allison Henderson <allison.henderson@...cle.com>,
        Zhang Tianci <zhangtianci.1997@...edance.com>,
        Brian Foster <bfoster@...hat.com>, linux-xfs@...r.kernel.org,
        linux-kernel@...r.kernel.org, xieyongji@...edance.com, me@...x.top,
        Jiachen Zhang <zhangjiachen.jaycee@...edance.com>
Subject: [PATCH v4 0/3] Fixes for ENOSPC xfs_remove

Hi,

Recently, our use-case ran into 2 bugs in case doing xfs_remove when the
disk space is in-pressure, which may cause xfs shutdown and kernel crash
in the xfs log recovery procedure. Here are 2 patches to fix the
problem, and a patch adding a helper to optimize the code structure.

The 1st patch fixes an uninitialized variable issue.

The 2nd patch ensures the blkno in the xfs_buf is updated when doing
xfs_da3_swap_lastblock().

The 3rd patch adds a xfs_buf copy helper to optimize the code structure.

Changes of v2:
- directly set the *logflagsp value to make the code more robust in the
  1st commit,
- check xfs's crc-feature rather than magic in the 2nd commit, and
- fixed code style and rebased onto the master branch.

Changes of v3:
- fix code style, and
- add a new patch which does xfs_buf memcpy in a helper.

Changes of v4:
- optimize comments.

Thanks,
Jiachen


Jiachen Zhang (1):
  xfs: ensure logflagsp is initialized in xfs_bmap_del_extent_real

Zhang Tianci (2):
  xfs: update dir3 leaf block metadata after swap
  xfs: extract xfs_da_buf_copy() helper function

 fs/xfs/libxfs/xfs_attr_leaf.c | 12 ++----
 fs/xfs/libxfs/xfs_bmap.c      | 73 +++++++++++++++--------------------
 fs/xfs/libxfs/xfs_da_btree.c  | 69 +++++++++++++++------------------
 fs/xfs/libxfs/xfs_da_btree.h  |  2 +
 4 files changed, 68 insertions(+), 88 deletions(-)

-- 
2.20.1