diff options
| author | Keith Busch | 2015-01-07 18:55:46 -0700 |
|---|---|---|
| committer | Jens Axboe | 2015-01-08 08:59:01 -0700 |
| commit | 5b3f25fc343690cafd3e27431a69a7bdaf9df001 (patch) | |
| tree | 8892062d8290c520faf5daf355bcc303501919d5 | |
| parent | 1885b24d23716e09b9c952822b05fd7f68099cdb (diff) | |
blk-mq: Allow requests to never expire
Some types of requests may be started that are not gauranteed to ever
complete. This adds a request flag that a driver can use so mark the
request as such.
Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
| -rw-r--r-- | block/blk-mq.c | 4 | ||||
| -rw-r--r-- | block/blk-timeout.c | 3 | ||||
| -rw-r--r-- | include/linux/blk_types.h | 2 |
3 files changed, 8 insertions, 1 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c index 261ccd89e15d..78324a2f0e10 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -619,7 +619,7 @@ void blk_mq_rq_timed_out(struct request *req, bool reserved) break; } } - + static void blk_mq_check_expired(struct blk_mq_hw_ctx *hctx, struct request *rq, void *priv, bool reserved) { @@ -627,6 +627,8 @@ static void blk_mq_check_expired(struct blk_mq_hw_ctx *hctx, if (!test_bit(REQ_ATOM_STARTED, &rq->atomic_flags)) return; + if (rq->cmd_flags & REQ_NO_TIMEOUT) + return; if (time_after_eq(jiffies, rq->deadline)) { if (!blk_mark_rq_complete(rq)) diff --git a/block/blk-timeout.c b/block/blk-timeout.c index 56c025894cdf..246dfb16c3d9 100644 --- a/block/blk-timeout.c +++ b/block/blk-timeout.c @@ -190,6 +190,9 @@ void blk_add_timer(struct request *req) struct request_queue *q = req->q; unsigned long expiry; + if (req->cmd_flags & REQ_NO_TIMEOUT) + return; + /* blk-mq has its own handler, so we don't need ->rq_timed_out_fn */ if (!q->mq_ops && !q->rq_timed_out_fn) return; diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index 445d59231bc4..c294e3e25e37 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -190,6 +190,7 @@ enum rq_flag_bits { __REQ_PM, /* runtime pm request */ __REQ_HASHED, /* on IO scheduler merge hash */ __REQ_MQ_INFLIGHT, /* track inflight for MQ */ + __REQ_NO_TIMEOUT, /* requests may never expire */ __REQ_NR_BITS, /* stops here */ }; @@ -243,5 +244,6 @@ enum rq_flag_bits { #define REQ_PM (1ULL << __REQ_PM) #define REQ_HASHED (1ULL << __REQ_HASHED) #define REQ_MQ_INFLIGHT (1ULL << __REQ_MQ_INFLIGHT) +#define REQ_NO_TIMEOUT (1ULL << __REQ_NO_TIMEOUT) #endif /* __LINUX_BLK_TYPES_H */ |