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block: add @force_kblockd to __blk_run_queue() 

__blk_run_queue() automatically either calls q->request_fn() directly
or schedules kblockd depending on whether the function is recursed.
blk-flush implementation needs to be able to explicitly choose
kblockd.  Add @force_kblockd.

All the current users are converted to specify %false for the
parameter and this patch doesn't introduce any behavior change.

stable: This is prerequisite for fixing ide oops caused by the new
        blk-flush implementation.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Jan Beulich <JBeulich@novell.com>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: stable@kernel.org
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
Tejun Heo 2011-03-02 08:48:05 -05:00 committed by Jens Axboe
parent 291d24f6d9
commit 1654e7411a
7 changed files with 15 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
block/blk-core.c
View File

@ -352,7 +352,7 @@ void blk_start_queue(struct request_queue *q)
WARN_ON(!irqs_disabled());
queue_flag_clear(QUEUE_FLAG_STOPPED, q);
__blk_run_queue(q);
__blk_run_queue(q, false);
}
EXPORT_SYMBOL(blk_start_queue);
@ -403,13 +403,14 @@ EXPORT_SYMBOL(blk_sync_queue);
/**
* __blk_run_queue - run a single device queue
* @q: The queue to run
* @force_kblockd: Don't run @q->request_fn directly. Use kblockd.
*
* Description:
* See @blk_run_queue. This variant must be called with the queue lock
* held and interrupts disabled.
*
*/
void __blk_run_queue(struct request_queue *q)
void __blk_run_queue(struct request_queue *q, bool force_kblockd)
{
blk_remove_plug(q);
@ -423,7 +424,7 @@ void __blk_run_queue(struct request_queue *q)
* Only recurse once to avoid overrunning the stack, let the unplug
* handling reinvoke the handler shortly if we already got there.
*/
if (!queue_flag_test_and_set(QUEUE_FLAG_REENTER, q)) {
if (!force_kblockd && !queue_flag_test_and_set(QUEUE_FLAG_REENTER, q)) {
q->request_fn(q);
queue_flag_clear(QUEUE_FLAG_REENTER, q);
} else {
@ -446,7 +447,7 @@ void blk_run_queue(struct request_queue *q)
unsigned long flags;
spin_lock_irqsave(q->queue_lock, flags);
__blk_run_queue(q);
__blk_run_queue(q, false);
spin_unlock_irqrestore(q->queue_lock, flags);
}
EXPORT_SYMBOL(blk_run_queue);
@ -1053,7 +1054,7 @@ void blk_insert_request(struct request_queue *q, struct request *rq,
drive_stat_acct(rq, 1);
__elv_add_request(q, rq, where, 0);
__blk_run_queue(q);
__blk_run_queue(q, false);
spin_unlock_irqrestore(q->queue_lock, flags);
}
EXPORT_SYMBOL(blk_insert_request);

2
block/blk-flush.c
View File

@ -69,7 +69,7 @@ static void blk_flush_complete_seq_end_io(struct request_queue *q,
* queue. Kick the queue in those cases.
*/
if (was_empty && next_rq)
__blk_run_queue(q);
__blk_run_queue(q, false);
}
static void pre_flush_end_io(struct request *rq, int error)

6
block/cfq-iosched.c
View File

@ -3355,7 +3355,7 @@ cfq_rq_enqueued(struct cfq_data *cfqd, struct cfq_queue *cfqq,
cfqd->busy_queues > 1) {
cfq_del_timer(cfqd, cfqq);
cfq_clear_cfqq_wait_request(cfqq);
__blk_run_queue(cfqd->queue);
__blk_run_queue(cfqd->queue, false);
} else {
cfq_blkiocg_update_idle_time_stats(
&cfqq->cfqg->blkg);
@ -3370,7 +3370,7 @@ cfq_rq_enqueued(struct cfq_data *cfqd, struct cfq_queue *cfqq,
* this new queue is RT and the current one is BE
*/
cfq_preempt_queue(cfqd, cfqq);
__blk_run_queue(cfqd->queue);
__blk_run_queue(cfqd->queue, false);
}
}
@ -3731,7 +3731,7 @@ static void cfq_kick_queue(struct work_struct *work)
struct request_queue *q = cfqd->queue;
spin_lock_irq(q->queue_lock);
__blk_run_queue(cfqd->queue);
__blk_run_queue(cfqd->queue, false);
spin_unlock_irq(q->queue_lock);
}

4
block/elevator.c
View File

@ -602,7 +602,7 @@ void elv_quiesce_start(struct request_queue *q)
*/
elv_drain_elevator(q);
while (q->rq.elvpriv) {
__blk_run_queue(q);
__blk_run_queue(q, false);
spin_unlock_irq(q->queue_lock);
msleep(10);
spin_lock_irq(q->queue_lock);
@ -651,7 +651,7 @@ void elv_insert(struct request_queue *q, struct request *rq, int where)
* with anything. There's no point in delaying queue
* processing.
*/
__blk_run_queue(q);
__blk_run_queue(q, false);
break;
case ELEVATOR_INSERT_SORT:

2
drivers/scsi/scsi_lib.c
View File

@ -443,7 +443,7 @@ static void scsi_run_queue(struct request_queue *q)
&sdev->request_queue->queue_flags);
if (flagset)
queue_flag_set(QUEUE_FLAG_REENTER, sdev->request_queue);
__blk_run_queue(sdev->request_queue);
__blk_run_queue(sdev->request_queue, false);
if (flagset)
queue_flag_clear(QUEUE_FLAG_REENTER, sdev->request_queue);
spin_unlock(sdev->request_queue->queue_lock);

2
drivers/scsi/scsi_transport_fc.c
View File

@ -3829,7 +3829,7 @@ fc_bsg_goose_queue(struct fc_rport *rport)
!test_bit(QUEUE_FLAG_REENTER, &rport->rqst_q->queue_flags);
if (flagset)
queue_flag_set(QUEUE_FLAG_REENTER, rport->rqst_q);
__blk_run_queue(rport->rqst_q);
__blk_run_queue(rport->rqst_q, false);
if (flagset)
queue_flag_clear(QUEUE_FLAG_REENTER, rport->rqst_q);
spin_unlock_irqrestore(rport->rqst_q->queue_lock, flags);

2
include/linux/blkdev.h
View File

@ -699,7 +699,7 @@ extern void blk_start_queue(struct request_queue *q);
extern void blk_stop_queue(struct request_queue *q);
extern void blk_sync_queue(struct request_queue *q);
extern void __blk_stop_queue(struct request_queue *q);
extern void __blk_run_queue(struct request_queue *);
extern void __blk_run_queue(struct request_queue *q, bool force_kblockd);
extern void blk_run_queue(struct request_queue *);
extern int blk_rq_map_user(struct request_queue *, struct request *,
struct rq_map_data *, void __user *, unsigned long,