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Make DISCARD_BARRIER and DISCARD_NOBARRIER writes instead of reads

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The commands are conceptually writes, and in the case of IDE and SCSI
commands actually are writes.  They were only reads because we thought
that would interact better with the elevators.  Now the elevators know
about discard requests, that advantage no longer exists.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
David Woodhouse 2009-09-12 07:35:37 +02:00 committed by Jens Axboe
parent b8a9ae779f
commit 3d2257f157
1 changed files with 2 additions and 2 deletions
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4
include/linux/fs.h
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@ -161,8 +161,8 @@ struct inodes_stat_t {
* 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 (1 << BIO_RW_DISCARD)
#define DISCARD_BARRIER ((1 << BIO_RW_DISCARD) | (1 << BIO_RW_BARRIER))
#define DISCARD_NOBARRIER (WRITE | (1 << BIO_RW_DISCARD))
#define DISCARD_BARRIER (DISCARD_NOBARRIER | (1 << BIO_RW_BARRIER))
#define SEL_IN 1
#define SEL_OUT 2