iomap: fix sub-page uptodate handling

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bio completions can race when a page spans more than one file system
block.  Add a spinlock to synchronize marking the page uptodate.

Fixes: 9dc55f1389 ("iomap: add support for sub-pagesize buffered I/O without buffer heads")
Reported-by: Jan Stancek <jstancek@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

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Christoph Hellwig 2019-12-04 09:33:52 -08:00 • committed by Darrick J. Wong

parent 88cfd30e18

commit 1cea335d1d

1 changed files with 25 additions and 10 deletions

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fs/iomap/buffered-io.c

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