Darrick J. Wong 2ca7125fff iomap: reject delalloc mappings during writeback ...

[ Upstream commit d320f160aa ]

Filesystems should never provide a delayed allocation mapping to
writeback; they're supposed to allocate the space before replying.
This can lead to weird IO errors and crashes in the block layer if the
filesystem is being malicious, or if it hadn't set iomap->dev because
it's a delalloc mapping.

Fix this by failing writeback on delalloc mappings.  Currently no
filesystems actually misbehave in this manner, but we ought to be
stricter about things like that.

Cc: stable@vger.kernel.org # v5.5
Fixes: 598ecfbaa7 ("iomap: lift the xfs writeback code to iomap")
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Link: https://patch.msgid.link/20260302173002.GL13829@frogsfrogsfrogs
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
[ iomap_add_to_ioend() => iomap_writepage_map_blocks() ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2026-03-25 11:08:42 +01:00

..

buffered-io.c

iomap: reject delalloc mappings during writeback

2026-03-25 11:08:42 +01:00

direct-io.c

iomap: fix submission side handling of completion side errors

2026-03-04 07:19:29 -05:00

fiemap.c

…

iter.c

…

Makefile

kbuild: use $(src) instead of $(srctree)/$(src) for source directory

2024-05-10 04:34:52 +09:00

seek.c

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swapfile.c

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trace.c

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trace.h

iomap: Add processed for iomap_iter

2024-02-21 08:37:50 +01:00