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vfs: add the RWF_HIPRI flag for preadv2/pwritev2

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This adds a flag that tells the file system that this is a high priority
request for which it's worth to poll the hardware.  The flag is purely
advisory and can be ignored if not supported.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Stephen Bates <stephen.bates@pmcs.com>
Tested-by: Stephen Bates <stephen.bates@pmcs.com>
Acked-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Christoph Hellwig 2016-03-03 16:04:01 +01:00 • committed by Al Viro
parent 4babf2c5ef
commit 97be7ebe53
3 changed files with 8 additions and 2 deletions
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3
include/uapi/linux/fs.h
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@ -305,4 +305,7 @@ struct fsxattr {
#define SYNC_FILE_RANGE_WRITE 2
#define SYNC_FILE_RANGE_WAIT_AFTER 4
/* flags for preadv2/pwritev2: */
#define RWF_HIPRI 0x00000001 /* high priority request, poll if possible */
#endif /* _UAPI_LINUX_FS_H */