nfs/localio: Ensure DIO WRITE's IO on stable storage upon completion

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LOCALIO's misaligned DIO WRITE support requires synchronous IO for any
misaligned head and/or tail that are issued using buffered IO.  In
addition, it is important that the O_DIRECT middle be on stable
storage upon its completion via AIO.

Otherwise, a misaligned DIO WRITE could mix buffered IO for the
head/tail and direct IO for the DIO-aligned middle -- which could lead
to problems associated with deferred writes to stable storage (such as
out of order partial completions causing incorrect advancement of the
file's offset, etc).

Fixes: c817248fc8 ("nfs/localio: add proper O_DIRECT support for READ and WRITE")
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>

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Mike Snitzer 2025-10-27 13:52:28 -04:00 • committed by Anna Schumaker

parent d0497dd274

commit d32ddfeb55

1 changed files with 5 additions and 1 deletions

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fs/nfs/localio.c

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