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block: Rename queue dead flag 

QUEUE_FLAG_DEAD is used to indicate that queuing new requests must
stop. After this flag has been set queue draining starts. However,
during the queue draining phase it is still safe to invoke the
queue's request_fn, so QUEUE_FLAG_DYING is a better name for this
flag.

This patch has been generated by running the following command
over the kernel source tree:

git grep -lEw 'blk_queue_dead|QUEUE_FLAG_DEAD' |
    xargs sed -i.tmp -e 's/blk_queue_dead/blk_queue_dying/g'      \
        -e 's/QUEUE_FLAG_DEAD/QUEUE_FLAG_DYING/g';                \
sed -i.tmp -e "s/QUEUE_FLAG_DYING$(printf \\t)*5/QUEUE_FLAG_DYING$(printf \\t)5/g" \
    include/linux/blkdev.h;                                       \
sed -i.tmp -e 's/ DEAD/ DYING/g' -e 's/dead queue/a dying queue/' \
    -e 's/Dead queue/A dying queue/' block/blk-core.c

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Acked-by: Tejun Heo <tj@kernel.org>
Cc: James Bottomley <JBottomley@Parallels.com>
Cc: Mike Christie <michaelc@cs.wisc.edu>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Chanho Min <chanho.min@lge.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Bart Van Assche 2012-11-28 13:42:38 +01:00 committed by Jens Axboe
parent 8fa72d234d
commit 3f3299d5c0
8 changed files with 22 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
block/blk-cgroup.c
View File

@ -231,7 +231,7 @@ struct blkcg_gq *blkg_lookup_create(struct blkcg *blkcg,
* we shouldn't allow anything to go through for a bypassing queue.
*/
if (unlikely(blk_queue_bypass(q)))
return ERR_PTR(blk_queue_dead(q) ? -EINVAL : -EBUSY);
return ERR_PTR(blk_queue_dying(q) ? -EINVAL : -EBUSY);
return __blkg_lookup_create(blkcg, q, NULL);
}
EXPORT_SYMBOL_GPL(blkg_lookup_create);

26
block/blk-core.c
View File

@ -473,20 +473,20 @@ EXPORT_SYMBOL_GPL(blk_queue_bypass_end);
* blk_cleanup_queue - shutdown a request queue
* @q: request queue to shutdown
*
* Mark @q DEAD, drain all pending requests, destroy and put it. All
* Mark @q DYING, drain all pending requests, destroy and put it. All
* future requests will be failed immediately with -ENODEV.
*/
void blk_cleanup_queue(struct request_queue *q)
{
spinlock_t *lock = q->queue_lock;
/* mark @q DEAD, no new request or merges will be allowed afterwards */
/* mark @q DYING, no new request or merges will be allowed afterwards */
mutex_lock(&q->sysfs_lock);
queue_flag_set_unlocked(QUEUE_FLAG_DEAD, q);
queue_flag_set_unlocked(QUEUE_FLAG_DYING, q);
spin_lock_irq(lock);
/*
* Dead queue is permanently in bypass mode till released. Note
* A dying queue is permanently in bypass mode till released. Note
* that, unlike blk_queue_bypass_start(), we aren't performing
* synchronize_rcu() after entering bypass mode to avoid the delay
* as some drivers create and destroy a lot of queues while
@ -499,11 +499,11 @@ void blk_cleanup_queue(struct request_queue *q)
queue_flag_set(QUEUE_FLAG_NOMERGES, q);
queue_flag_set(QUEUE_FLAG_NOXMERGES, q);
queue_flag_set(QUEUE_FLAG_DEAD, q);
queue_flag_set(QUEUE_FLAG_DYING, q);
spin_unlock_irq(lock);
mutex_unlock(&q->sysfs_lock);
/* drain all requests queued before DEAD marking */
/* drain all requests queued before DYING marking */
blk_drain_queue(q, true);
/* @q won't process any more request, flush async actions */
@ -716,7 +716,7 @@ EXPORT_SYMBOL(blk_init_allocated_queue);
bool blk_get_queue(struct request_queue *q)
{
if (likely(!blk_queue_dead(q))) {
if (likely(!blk_queue_dying(q))) {
__blk_get_queue(q);
return true;
}
@ -870,7 +870,7 @@ static struct request *__get_request(struct request_list *rl, int rw_flags,
const bool is_sync = rw_is_sync(rw_flags) != 0;
int may_queue;
if (unlikely(blk_queue_dead(q)))
if (unlikely(blk_queue_dying(q)))
return NULL;
may_queue = elv_may_queue(q, rw_flags);
@ -1050,7 +1050,7 @@ retry:
if (rq)
return rq;
if (!(gfp_mask & __GFP_WAIT) || unlikely(blk_queue_dead(q))) {
if (!(gfp_mask & __GFP_WAIT) || unlikely(blk_queue_dying(q))) {
blk_put_rl(rl);
return NULL;
}
@ -1910,7 +1910,7 @@ int blk_insert_cloned_request(struct request_queue *q, struct request *rq)
return -EIO;
spin_lock_irqsave(q->queue_lock, flags);
if (unlikely(blk_queue_dead(q))) {
if (unlikely(blk_queue_dying(q))) {
spin_unlock_irqrestore(q->queue_lock, flags);
return -ENODEV;
}
@ -2885,9 +2885,9 @@ static void queue_unplugged(struct request_queue *q, unsigned int depth,
trace_block_unplug(q, depth, !from_schedule);
/*
* Don't mess with dead queue.
* Don't mess with a dying queue.
*/
if (unlikely(blk_queue_dead(q))) {
if (unlikely(blk_queue_dying(q))) {
spin_unlock(q->queue_lock);
return;
}
@ -2996,7 +2996,7 @@ void blk_flush_plug_list(struct blk_plug *plug, bool from_schedule)
/*
* Short-circuit if @q is dead
*/
if (unlikely(blk_queue_dead(q))) {
if (unlikely(blk_queue_dying(q))) {
__blk_end_request_all(rq, -ENODEV);
continue;
}

2
block/blk-exec.c
View File

@ -60,7 +60,7 @@ void blk_execute_rq_nowait(struct request_queue *q, struct gendisk *bd_disk,
spin_lock_irq(q->queue_lock);
if (unlikely(blk_queue_dead(q))) {
if (unlikely(blk_queue_dying(q))) {
rq->errors = -ENXIO;
if (rq->end_io)
rq->end_io(rq, rq->errors);

4
block/blk-sysfs.c
View File

@ -466,7 +466,7 @@ queue_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
if (!entry->show)
return -EIO;
mutex_lock(&q->sysfs_lock);
if (blk_queue_dead(q)) {
if (blk_queue_dying(q)) {
mutex_unlock(&q->sysfs_lock);
return -ENOENT;
}
@ -488,7 +488,7 @@ queue_attr_store(struct kobject *kobj, struct attribute *attr,
q = container_of(kobj, struct request_queue, kobj);
mutex_lock(&q->sysfs_lock);
if (blk_queue_dead(q)) {
if (blk_queue_dying(q)) {
mutex_unlock(&q->sysfs_lock);
return -ENOENT;
}

2
block/blk-throttle.c
View File

@ -302,7 +302,7 @@ static struct throtl_grp *throtl_lookup_create_tg(struct throtl_data *td,
/* if %NULL and @q is alive, fall back to root_tg */
if (!IS_ERR(blkg))
tg = blkg_to_tg(blkg);
else if (!blk_queue_dead(q))
else if (!blk_queue_dying(q))
tg = td_root_tg(td);
}

2
block/blk.h
View File

@ -96,7 +96,7 @@ static inline struct request *__elv_next_request(struct request_queue *q)
q->flush_queue_delayed = 1;
return NULL;
}
if (unlikely(blk_queue_dead(q)) ||
if (unlikely(blk_queue_dying(q)) ||
!q->elevator->type->ops.elevator_dispatch_fn(q, 0))
return NULL;
}

2
drivers/scsi/scsi_lib.c
View File

@ -1406,7 +1406,7 @@ static int scsi_lld_busy(struct request_queue *q)
struct scsi_device *sdev = q->queuedata;
struct Scsi_Host *shost;
if (blk_queue_dead(q))
if (blk_queue_dying(q))
return 0;
shost = sdev->host;

4
include/linux/blkdev.h
View File

@ -437,7 +437,7 @@ struct request_queue {
#define QUEUE_FLAG_STOPPED 2 /* queue is stopped */
#define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */
#define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */
#define QUEUE_FLAG_DEAD 5 /* queue being torn down */
#define QUEUE_FLAG_DYING 5 /* queue being torn down */
#define QUEUE_FLAG_BYPASS 6 /* act as dumb FIFO queue */
#define QUEUE_FLAG_BIDI 7 /* queue supports bidi requests */
#define QUEUE_FLAG_NOMERGES 8 /* disable merge attempts */
@ -521,7 +521,7 @@ static inline void queue_flag_clear(unsigned int flag, struct request_queue *q)
#define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags)
#define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
#define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags)
#define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
#define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags)
#define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
#define blk_queue_noxmerges(q) \