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VDEV_REQ_FUA should be mapped to REQ_FUA 

Pre-2.6.37 kernels support REQ_FUA in request flags, but not in BIO
flags. zvols are the only consumer of VDEV_REQ_FUA and since they are
passed requests, they should be obey the REQ_FUA flag like later
kernels. This optimization will only matter on 2.6.36 and 2.6.37 because
the zvol rework changes things to use bio, where we no longer are able
to distinguish on earlier kernels

Signed-off-by: Richard Yao <ryao@gentoo.org>
This commit is contained in:
Richard Yao 2015-08-31 11:36:32 -04:00
parent 69de34219a
commit 782b2c326e
1 changed files with 1 additions and 1 deletions
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include/linux/blkdev_compat.h
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@ -458,7 +458,7 @@ bio_set_flags_failfast(struct block_device *bdev, int *flags)
#else #else
#define VDEV_WRITE_FLUSH_FUA WRITE_BARRIER #define VDEV_WRITE_FLUSH_FUA WRITE_BARRIER
#define VDEV_REQ_FLUSH REQ_HARDBARRIER #define VDEV_REQ_FLUSH REQ_HARDBARRIER
#define VDEV_REQ_FUA REQ_HARDBARRIER #define VDEV_REQ_FUA REQ_FUA
#endif #endif
/* /*