aboutsummaryrefslogtreecommitdiff
path: root/block
diff options
context:
space:
mode:
authorTejun Heo <tj@kernel.org>2012-06-04 20:40:59 -0700
committerJens Axboe <axboe@kernel.dk>2012-06-25 11:53:52 +0200
commit5b788ce3e2acac9bf109743b1281d77347cf2101 (patch)
tree907477e42d27bec9a2060fcc709402b7636390c9 /block
parent8a5ecdd42862bf87ceab00bf2a15d7eabf58c02d (diff)
downloadlinux-linaro-stable-5b788ce3e2acac9bf109743b1281d77347cf2101.tar.gz
block: prepare for multiple request_lists
Request allocation is about to be made per-blkg meaning that there'll be multiple request lists. * Make queue full state per request_list. blk_*queue_full() functions are renamed to blk_*rl_full() and takes @rl instead of @q. * Rename blk_init_free_list() to blk_init_rl() and make it take @rl instead of @q. Also add @gfp_mask parameter. * Add blk_exit_rl() instead of destroying rl directly from blk_release_queue(). * Add request_list->q and make request alloc/free functions - blk_free_request(), [__]freed_request(), __get_request() - take @rl instead of @q. This patch doesn't introduce any functional difference. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r--block/blk-core.c56
-rw-r--r--block/blk-sysfs.c12
-rw-r--r--block/blk.h3
3 files changed, 39 insertions, 32 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index a2648153691f..f392a2edf462 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -517,13 +517,13 @@ void blk_cleanup_queue(struct request_queue *q)
}
EXPORT_SYMBOL(blk_cleanup_queue);
-static int blk_init_free_list(struct request_queue *q)
+int blk_init_rl(struct request_list *rl, struct request_queue *q,
+ gfp_t gfp_mask)
{
- struct request_list *rl = &q->rq;
-
if (unlikely(rl->rq_pool))
return 0;
+ rl->q = q;
rl->count[BLK_RW_SYNC] = rl->count[BLK_RW_ASYNC] = 0;
rl->starved[BLK_RW_SYNC] = rl->starved[BLK_RW_ASYNC] = 0;
init_waitqueue_head(&rl->wait[BLK_RW_SYNC]);
@@ -531,13 +531,19 @@ static int blk_init_free_list(struct request_queue *q)
rl->rq_pool = mempool_create_node(BLKDEV_MIN_RQ, mempool_alloc_slab,
mempool_free_slab, request_cachep,
- GFP_KERNEL, q->node);
+ gfp_mask, q->node);
if (!rl->rq_pool)
return -ENOMEM;
return 0;
}
+void blk_exit_rl(struct request_list *rl)
+{
+ if (rl->rq_pool)
+ mempool_destroy(rl->rq_pool);
+}
+
struct request_queue *blk_alloc_queue(gfp_t gfp_mask)
{
return blk_alloc_queue_node(gfp_mask, -1);
@@ -679,7 +685,7 @@ blk_init_allocated_queue(struct request_queue *q, request_fn_proc *rfn,
if (!q)
return NULL;
- if (blk_init_free_list(q))
+ if (blk_init_rl(&q->rq, q, GFP_KERNEL))
return NULL;
q->request_fn = rfn;
@@ -721,15 +727,15 @@ bool blk_get_queue(struct request_queue *q)
}
EXPORT_SYMBOL(blk_get_queue);
-static inline void blk_free_request(struct request_queue *q, struct request *rq)
+static inline void blk_free_request(struct request_list *rl, struct request *rq)
{
if (rq->cmd_flags & REQ_ELVPRIV) {
- elv_put_request(q, rq);
+ elv_put_request(rl->q, rq);
if (rq->elv.icq)
put_io_context(rq->elv.icq->ioc);
}
- mempool_free(rq, q->rq.rq_pool);
+ mempool_free(rq, rl->rq_pool);
}
/*
@@ -766,9 +772,9 @@ static void ioc_set_batching(struct request_queue *q, struct io_context *ioc)
ioc->last_waited = jiffies;
}
-static void __freed_request(struct request_queue *q, int sync)
+static void __freed_request(struct request_list *rl, int sync)
{
- struct request_list *rl = &q->rq;
+ struct request_queue *q = rl->q;
if (rl->count[sync] < queue_congestion_off_threshold(q))
blk_clear_queue_congested(q, sync);
@@ -777,7 +783,7 @@ static void __freed_request(struct request_queue *q, int sync)
if (waitqueue_active(&rl->wait[sync]))
wake_up(&rl->wait[sync]);
- blk_clear_queue_full(q, sync);
+ blk_clear_rl_full(rl, sync);
}
}
@@ -785,9 +791,9 @@ static void __freed_request(struct request_queue *q, int sync)
* A request has just been released. Account for it, update the full and
* congestion status, wake up any waiters. Called under q->queue_lock.
*/
-static void freed_request(struct request_queue *q, unsigned int flags)
+static void freed_request(struct request_list *rl, unsigned int flags)
{
- struct request_list *rl = &q->rq;
+ struct request_queue *q = rl->q;
int sync = rw_is_sync(flags);
q->nr_rqs[sync]--;
@@ -795,10 +801,10 @@ static void freed_request(struct request_queue *q, unsigned int flags)
if (flags & REQ_ELVPRIV)
q->nr_rqs_elvpriv--;
- __freed_request(q, sync);
+ __freed_request(rl, sync);
if (unlikely(rl->starved[sync ^ 1]))
- __freed_request(q, sync ^ 1);
+ __freed_request(rl, sync ^ 1);
}
/*
@@ -838,7 +844,7 @@ static struct io_context *rq_ioc(struct bio *bio)
/**
* __get_request - get a free request
- * @q: request_queue to allocate request from
+ * @rl: request list to allocate from
* @rw_flags: RW and SYNC flags
* @bio: bio to allocate request for (can be %NULL)
* @gfp_mask: allocation mask
@@ -850,11 +856,11 @@ static struct io_context *rq_ioc(struct bio *bio)
* Returns %NULL on failure, with @q->queue_lock held.
* Returns !%NULL on success, with @q->queue_lock *not held*.
*/
-static struct request *__get_request(struct request_queue *q, int rw_flags,
+static struct request *__get_request(struct request_list *rl, int rw_flags,
struct bio *bio, gfp_t gfp_mask)
{
+ struct request_queue *q = rl->q;
struct request *rq;
- struct request_list *rl = &q->rq;
struct elevator_type *et = q->elevator->type;
struct io_context *ioc = rq_ioc(bio);
struct io_cq *icq = NULL;
@@ -876,9 +882,9 @@ static struct request *__get_request(struct request_queue *q, int rw_flags,
* This process will be allowed to complete a batch of
* requests, others will be blocked.
*/
- if (!blk_queue_full(q, is_sync)) {
+ if (!blk_rl_full(rl, is_sync)) {
ioc_set_batching(q, ioc);
- blk_set_queue_full(q, is_sync);
+ blk_set_rl_full(rl, is_sync);
} else {
if (may_queue != ELV_MQUEUE_MUST
&& !ioc_batching(q, ioc)) {
@@ -928,7 +934,7 @@ static struct request *__get_request(struct request_queue *q, int rw_flags,
spin_unlock_irq(q->queue_lock);
/* allocate and init request */
- rq = mempool_alloc(q->rq.rq_pool, gfp_mask);
+ rq = mempool_alloc(rl->rq_pool, gfp_mask);
if (!rq)
goto fail_alloc;
@@ -992,7 +998,7 @@ fail_alloc:
* queue, but this is pretty rare.
*/
spin_lock_irq(q->queue_lock);
- freed_request(q, rw_flags);
+ freed_request(rl, rw_flags);
/*
* in the very unlikely event that allocation failed and no
@@ -1029,7 +1035,7 @@ static struct request *get_request(struct request_queue *q, int rw_flags,
struct request_list *rl = &q->rq;
struct request *rq;
retry:
- rq = __get_request(q, rw_flags, bio, gfp_mask);
+ rq = __get_request(&q->rq, rw_flags, bio, gfp_mask);
if (rq)
return rq;
@@ -1229,8 +1235,8 @@ void __blk_put_request(struct request_queue *q, struct request *req)
BUG_ON(!list_empty(&req->queuelist));
BUG_ON(!hlist_unhashed(&req->hash));
- blk_free_request(q, req);
- freed_request(q, flags);
+ blk_free_request(&q->rq, req);
+ freed_request(&q->rq, flags);
}
}
EXPORT_SYMBOL_GPL(__blk_put_request);
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index aa41b47c22d2..234ce7c082fa 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -66,16 +66,16 @@ queue_requests_store(struct request_queue *q, const char *page, size_t count)
blk_clear_queue_congested(q, BLK_RW_ASYNC);
if (rl->count[BLK_RW_SYNC] >= q->nr_requests) {
- blk_set_queue_full(q, BLK_RW_SYNC);
+ blk_set_rl_full(rl, BLK_RW_SYNC);
} else {
- blk_clear_queue_full(q, BLK_RW_SYNC);
+ blk_clear_rl_full(rl, BLK_RW_SYNC);
wake_up(&rl->wait[BLK_RW_SYNC]);
}
if (rl->count[BLK_RW_ASYNC] >= q->nr_requests) {
- blk_set_queue_full(q, BLK_RW_ASYNC);
+ blk_set_rl_full(rl, BLK_RW_ASYNC);
} else {
- blk_clear_queue_full(q, BLK_RW_ASYNC);
+ blk_clear_rl_full(rl, BLK_RW_ASYNC);
wake_up(&rl->wait[BLK_RW_ASYNC]);
}
spin_unlock_irq(q->queue_lock);
@@ -476,7 +476,6 @@ static void blk_release_queue(struct kobject *kobj)
{
struct request_queue *q =
container_of(kobj, struct request_queue, kobj);
- struct request_list *rl = &q->rq;
blk_sync_queue(q);
@@ -489,8 +488,7 @@ static void blk_release_queue(struct kobject *kobj)
elevator_exit(q->elevator);
}
- if (rl->rq_pool)
- mempool_destroy(rl->rq_pool);
+ blk_exit_rl(&q->rq);
if (q->queue_tags)
__blk_queue_free_tags(q);
diff --git a/block/blk.h b/block/blk.h
index 85f6ae42f7d3..a134231fd22a 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -18,6 +18,9 @@ static inline void __blk_get_queue(struct request_queue *q)
kobject_get(&q->kobj);
}
+int blk_init_rl(struct request_list *rl, struct request_queue *q,
+ gfp_t gfp_mask);
+void blk_exit_rl(struct request_list *rl);
void init_request_from_bio(struct request *req, struct bio *bio);
void blk_rq_bio_prep(struct request_queue *q, struct request *rq,
struct bio *bio);