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block: remove the BLKDEV_IFL_BARRIER flag

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Remove support for barriers on discards, which is unused now.  Also
remove the DISCARD_NOBARRIER I/O type in favour of just setting the
rw flags up locally in blkdev_issue_discard.

tj: Also remove DISCARD_SECURE and use REQ_SECURE directly.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
Christoph Hellwig
2010-08-18 05:29:22 -04:00
committed by Jens Axboe
parent 31725e65c7
commit 8c55536782
3 changed files with 2 additions and 26 deletions
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8
include/linux/fs.h
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@@ -163,14 +163,6 @@ struct inodes_stat_t {
#define WRITE_FLUSH_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_UNPLUG | \
REQ_FLUSH | REQ_FUA)
/*
* These aren't really reads or writes, they pass down information about
* parts of device that are now unused by the file system.
*/
#define DISCARD_NOBARRIER (WRITE | REQ_DISCARD)
#define DISCARD_BARRIER (WRITE | REQ_DISCARD | REQ_HARDBARRIER)
#define DISCARD_SECURE (DISCARD_NOBARRIER | REQ_SECURE)
#define SEL_IN 1
#define SEL_OUT 2
#define SEL_EX 4