diff options
| author | Jens Axboe <axboe@fb.com> | 2016-07-27 15:30:35 -0600 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2016-10-04 10:18:57 -0600 |
| commit | b2a5e10257a5cbdcdd8a55726ff3fb0fe40085cf (patch) | |
| tree | 889a9962d296ea2649aeb4ca3e90b3d88368be00 | |
| parent | c8d2bc9bc39ebea8437fd974fdbc21847bb897a3 (diff) | |
block: add WRITE_BG
This adds a new request flag, REQ_BG, that callers can use to tell
the block layer that this is background (non-urgent) IO.
Signed-off-by: Jens Axboe <axboe@fb.com>
| -rw-r--r-- | include/linux/blk_types.h | 4 | ||||
| -rw-r--r-- | include/linux/fs.h | 3 |
2 files changed, 6 insertions, 1 deletions
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index 436f43f87da9..be4409b6ae4f 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -155,6 +155,7 @@ enum rq_flag_bits { __REQ_INTEGRITY, /* I/O includes block integrity payload */ __REQ_FUA, /* forced unit access */ __REQ_PREFLUSH, /* request for cache flush */ + __REQ_BG, /* background activity */ /* bio only flags */ __REQ_RAHEAD, /* read ahead, can fail anytime */ @@ -198,7 +199,7 @@ enum rq_flag_bits { (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER) #define REQ_COMMON_MASK \ (REQ_FAILFAST_MASK | REQ_SYNC | REQ_META | REQ_PRIO | REQ_NOIDLE | \ - REQ_PREFLUSH | REQ_FUA | REQ_INTEGRITY | REQ_NOMERGE) + REQ_PREFLUSH | REQ_FUA | REQ_INTEGRITY | REQ_NOMERGE | REQ_BG) #define REQ_CLONE_MASK REQ_COMMON_MASK /* This mask is used for both bio and request merge checking */ @@ -223,6 +224,7 @@ enum rq_flag_bits { #define REQ_COPY_USER (1ULL << __REQ_COPY_USER) #define REQ_PREFLUSH (1ULL << __REQ_PREFLUSH) #define REQ_FLUSH_SEQ (1ULL << __REQ_FLUSH_SEQ) +#define REQ_BG (1ULL << __REQ_BG) #define REQ_IO_STAT (1ULL << __REQ_IO_STAT) #define REQ_MIXED_MERGE (1ULL << __REQ_MIXED_MERGE) #define REQ_PM (1ULL << __REQ_PM) diff --git a/include/linux/fs.h b/include/linux/fs.h index 901e25d495cc..7c7951f1166a 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -189,6 +189,8 @@ typedef int (dio_iodone_t)(struct kiocb *iocb, loff_t offset, * WRITE_FLUSH_FUA Combination of WRITE_FLUSH and FUA. The IO is preceded * by a cache flush and data is guaranteed to be on * non-volatile media on completion. + * WRITE_BG Background write. This is for background activity like + * the periodic flush and background threshold writeback * */ #define RW_MASK REQ_OP_WRITE @@ -202,6 +204,7 @@ typedef int (dio_iodone_t)(struct kiocb *iocb, loff_t offset, #define WRITE_FLUSH (REQ_SYNC | REQ_NOIDLE | REQ_PREFLUSH) #define WRITE_FUA (REQ_SYNC | REQ_NOIDLE | REQ_FUA) #define WRITE_FLUSH_FUA (REQ_SYNC | REQ_NOIDLE | REQ_PREFLUSH | REQ_FUA) +#define WRITE_BG (REQ_NOIDLE | REQ_BG) /* * Attribute flags. These should be or-ed together to figure out what |