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authorChristoph Hellwig <hch@lst.de>2014-02-10 09:29:00 -0700
committerJens Axboe <axboe@fb.com>2014-02-10 09:29:00 -0700
commit18741986a4b1dc4b1f171634c4191abc3b0fa023 (patch)
treed0f632fa9b205d5fbcc76ff1cf8cba63112c7da8 /include/linux
parentce2c350b2cfe5b5ca5023a6b1ec4d21821d39add (diff)
blk-mq: rework flush sequencing logic
Witch to using a preallocated flush_rq for blk-mq similar to what's done with the old request path. This allows us to set up the request properly with a tag from the actually allowed range and ->rq_disk as needed by some drivers. To make life easier we also switch to dynamic allocation of ->flush_rq for the old path. This effectively reverts most of "blk-mq: fix for flush deadlock" and "blk-mq: Don't reserve a tag for flush request" Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/blk-mq.h5
-rw-r--r--include/linux/blkdev.h11
2 files changed, 4 insertions, 12 deletions
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index 468be242db90..18ba8a627f46 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -36,15 +36,12 @@ struct blk_mq_hw_ctx {
struct list_head page_list;
struct blk_mq_tags *tags;
- atomic_t pending_flush;
-
unsigned long queued;
unsigned long run;
#define BLK_MQ_MAX_DISPATCH_ORDER 10
unsigned long dispatched[BLK_MQ_MAX_DISPATCH_ORDER];
unsigned int queue_depth;
- unsigned int reserved_tags;
unsigned int numa_node;
unsigned int cmd_size; /* per-request extra data */
@@ -129,7 +126,7 @@ void blk_mq_insert_request(struct request_queue *, struct request *,
void blk_mq_run_queues(struct request_queue *q, bool async);
void blk_mq_free_request(struct request *rq);
bool blk_mq_can_queue(struct blk_mq_hw_ctx *);
-struct request *blk_mq_alloc_request(struct request_queue *q, int rw, gfp_t gfp, bool reserved);
+struct request *blk_mq_alloc_request(struct request_queue *q, int rw, gfp_t gfp);
struct request *blk_mq_alloc_reserved_request(struct request_queue *q, int rw, gfp_t gfp);
struct request *blk_mq_rq_from_tag(struct request_queue *q, unsigned int tag);
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 0375654adb28..b2d25ecbcbc1 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -101,7 +101,7 @@ struct request {
};
union {
struct call_single_data csd;
- struct work_struct mq_flush_data;
+ struct work_struct mq_flush_work;
};
struct request_queue *q;
@@ -451,13 +451,8 @@ struct request_queue {
unsigned long flush_pending_since;
struct list_head flush_queue[2];
struct list_head flush_data_in_flight;
- union {
- struct request flush_rq;
- struct {
- spinlock_t mq_flush_lock;
- struct work_struct mq_flush_work;
- };
- };
+ struct request *flush_rq;
+ spinlock_t mq_flush_lock;
struct mutex sysfs_lock;

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