fs: support RWF_NOWAIT for buffered reads

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This is based on the old idea and code from Milosz Tanski.  With the aio
nowait code it becomes mostly trivial now.  Buffered writes continue to
return -EOPNOTSUPP if RWF_NOWAIT is passed.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

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Christoph Hellwig 2017-08-29 16:13:20 +02:00 • committed by Al Viro

parent 3239d83484

commit 91f9943e1c

5 changed files with 20 additions and 15 deletions

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6

fs/aio.c

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6

fs/btrfs/file.c

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6

fs/ext4/file.c

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11

fs/xfs/xfs_file.c

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6

include/linux/fs.h

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