fs: iomap: Atomic write support

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Support direct I/O atomic writes by producing a single bio with REQ_ATOMIC
flag set.

Initially FSes (XFS) should only support writing a single FS block
atomically.

As with any atomic write, we should produce a single bio which covers the
complete write length.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Signed-off-by: John Garry <john.g.garry@oracle.com>
Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
[djwong: clarify a couple of things in the docs]
Signed-off-by: Darrick J. Wong <djwong@kernel.org>

...

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John Garry 2024-11-04 16:14:02 -08:00 • committed by Darrick J. Wong

parent a570bad16b

commit 9e0933c21c

4 changed files with 52 additions and 5 deletions

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15

Documentation/filesystems/iomap/operations.rst

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38

fs/iomap/direct-io.c

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3

fs/iomap/trace.h

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1

include/linux/iomap.h

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