linux-kernel - [PATCH v5 0/9] xfs/iomap: fix non-atomic clone operation and don't update size when zeroing range post eof

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Message-Id: <20240425131335.878454-1-yi.zhang@huaweicloud.com>
Date: Thu, 25 Apr 2024 21:13:26 +0800
From: Zhang Yi <yi.zhang@...weicloud.com>
To: linux-xfs@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	djwong@...nel.org,
	hch@...radead.org,
	brauner@...nel.org,
	david@...morbit.com,
	chandanbabu@...nel.org,
	tytso@....edu,
	jack@...e.cz,
	yi.zhang@...wei.com,
	yi.zhang@...weicloud.com,
	chengzhihao1@...wei.com,
	yukuai3@...wei.com
Subject: [PATCH v5 0/9] xfs/iomap: fix non-atomic clone operation and don't update size when zeroing range post eof

Changes since v4:
 - For zeroing range in xfs, move the delalloc check to before searching
   the COW fork when zeroing range. Only modify patch 04, please see it
   for details, not modify other patches.

Changes since v3:
 - Improve some git message comments and do some minor code cleanup, no
   logic changes.

Changes since v2:
 - Merge the patch for dropping of xfs_convert_blocks() and the patch
   for modifying xfs_bmapi_convert_delalloc().
 - Reword the commit message of the second patch.

Changes since v1:
 - Make xfs_bmapi_convert_delalloc() to allocate the target offset and
   drop the writeback helper xfs_convert_blocks().
 - Don't use xfs_iomap_write_direct() to convert delalloc blocks for
   zeroing posteof case, use xfs_bmapi_convert_delalloc() instead.
 - Fix two off-by-one issues when converting delalloc blocks.
 - Add a separate patch to drop the buffered write failure handle in
   zeroing and unsharing.
 - Add a comments do emphasize updating i_size should under folio lock.
 - Make iomap_write_end() to return a boolean, and do some cleanups in
   buffered write begin path.

This patch series fix a problem of exposing zeroed data on xfs since the
non-atomic clone operation. This problem was found while I was
developing ext4 buffered IO iomap conversion (ext4 is relying on this
fix [1]), the root cause of this problem and the discussion about the
solution please see [2]. After fix the problem, iomap_zero_range()
doesn't need to update i_size so that ext4 can use it to zero partial
block, e.g. truncate eof block [3].

[1] https://lore.kernel.org/linux-ext4/20240127015825.1608160-1-yi.zhang@huaweicloud.com/
[2] https://lore.kernel.org/linux-ext4/9b0040ef-3d9d-6246-4bdd-82b9a8f55fa2@huaweicloud.com/
[3] https://lore.kernel.org/linux-ext4/9c9f1831-a772-299b-072b-1c8116c3fb35@huaweicloud.com/

Thanks,
Yi.

Zhang Yi (9):
  xfs: match lock mode in xfs_buffered_write_iomap_begin()
  xfs: make the seq argument to xfs_bmapi_convert_delalloc() optional
  xfs: make xfs_bmapi_convert_delalloc() to allocate the target offset
  xfs: convert delayed extents to unwritten when zeroing post eof blocks
  iomap: drop the write failure handles when unsharing and zeroing
  iomap: don't increase i_size if it's not a write operation
  iomap: use a new variable to handle the written bytes in
    iomap_write_iter()
  iomap: make iomap_write_end() return a boolean
  iomap: do some small logical cleanup in buffered write

 fs/iomap/buffered-io.c   | 105 ++++++++++++++++++++++-----------------
 fs/xfs/libxfs/xfs_bmap.c |  40 +++++++++++++--
 fs/xfs/xfs_aops.c        |  54 ++++++--------------
 fs/xfs/xfs_iomap.c       |  39 +++++++++++++--
 4 files changed, 144 insertions(+), 94 deletions(-)

-- 
2.39.2