linux-kernel - [PATCH 0/4] xfs/iomap: fix non-atomic clone operation and don't update size when zeroing range post eof

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Message-Id: <20240311122255.2637311-1-yi.zhang@huaweicloud.com>
Date: Mon, 11 Mar 2024 20:22:51 +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,
	tytso@....edu,
	jack@...e.cz,
	yi.zhang@...wei.com,
	yi.zhang@...weicloud.com,
	chengzhihao1@...wei.com,
	yukuai3@...wei.com
Subject: [PATCH 0/4] xfs/iomap: fix non-atomic clone operation and don't update size when zeroing range post eof

From: Zhang Yi <yi.zhang@...wei.com>

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 (4):
  xfs: match lock mode in xfs_buffered_write_iomap_begin()
  xfs: convert delayed extents to unwritten when zeroing post eof blocks
  iomap: don't increase i_size if it's not a write operation
  iomap: cleanup iomap_write_iter()

 fs/iomap/buffered-io.c | 78 +++++++++++++++++++++---------------------
 fs/xfs/xfs_iomap.c     | 39 ++++++++++++++++++---
 2 files changed, 73 insertions(+), 44 deletions(-)

-- 
2.39.2