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| author | Christoph Hellwig <hch@infradead.org> | 2011-08-23 14:50:29 +0200 |
|---|---|---|
| committer | Brett Rogers <brettrogers11@gmail.com> | 2016-02-16 16:29:47 -0800 |
| commit | 04f87da71ab532ee1d794cbb2a464d2f35cd118d (patch) | |
| tree | 1cf7ef6f9d9cf3f1b226ee1cbb0040308f90916a /include | |
| parent | b1ce5b792e0c6bddb9012dbbff63cfcc3a4aaf87 (diff) | |
| download | kernel_samsung_smdk4412-04f87da71ab532ee1d794cbb2a464d2f35cd118d.tar.gz kernel_samsung_smdk4412-04f87da71ab532ee1d794cbb2a464d2f35cd118d.tar.bz2 kernel_samsung_smdk4412-04f87da71ab532ee1d794cbb2a464d2f35cd118d.zip | |
block: separate priority boosting from REQ_META
Add a new REQ_PRIO to let requests preempt others in the cfq I/O schedule,
and lave REQ_META purely for marking requests as metadata in blktrace.
All existing callers of REQ_META except for XFS are updated to also
set REQ_PRIO for now.
Backported to 3.0.x by Ketut Putu Kumajaya <ketut.kumajaya@gmail.com>
Change-Id: Iad5ba7a105438776f74788c0aedaf85210c613f9
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/blk_types.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index 6395692b2e7..cee53e3ec51 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -124,6 +124,7 @@ enum rq_flag_bits { __REQ_SYNC, /* request is sync (sync write or read) */ __REQ_META, /* metadata io request */ + __REQ_PRIO, /* boost priority in cfq */ __REQ_DISCARD, /* request to discard sectors */ __REQ_NOIDLE, /* don't anticipate more IO after this one */ @@ -160,14 +161,15 @@ enum rq_flag_bits { #define REQ_FAILFAST_DRIVER (1 << __REQ_FAILFAST_DRIVER) #define REQ_SYNC (1 << __REQ_SYNC) #define REQ_META (1 << __REQ_META) +#define REQ_PRIO (1 << __REQ_PRIO) #define REQ_DISCARD (1 << __REQ_DISCARD) #define REQ_NOIDLE (1 << __REQ_NOIDLE) #define REQ_FAILFAST_MASK \ (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER) #define REQ_COMMON_MASK \ - (REQ_WRITE | REQ_FAILFAST_MASK | REQ_SYNC | REQ_META | REQ_DISCARD | \ - REQ_NOIDLE | REQ_FLUSH | REQ_FUA | REQ_SECURE) + (REQ_WRITE | REQ_FAILFAST_MASK | REQ_SYNC | REQ_META | REQ_PRIO | \ + REQ_DISCARD | REQ_NOIDLE | REQ_FLUSH | REQ_FUA | REQ_SECURE) #define REQ_CLONE_MASK REQ_COMMON_MASK #define REQ_RAHEAD (1 << __REQ_RAHEAD) |