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Merge branch 'for-linus' into for-3.1/core

Browse source 
Conflicts:
	block/blk-throttle.c
	block/cfq-iosched.c

Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Jens Axboe 2011-07-01 16:17:13 +02:00
commit 04bf7869ca
992 changed files with 12546 additions and 6664 deletions
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79
block/genhd.c
View file

@ -1371,6 +1371,7 @@ struct disk_events {
struct gendisk *disk; /* the associated disk */
spinlock_t lock;
struct mutex block_mutex; /* protects blocking */
int block; /* event blocking depth */
unsigned int pending; /* events already sent out */
unsigned int clearing; /* events being cleared */
@ -1414,22 +1415,44 @@ static unsigned long disk_events_poll_jiffies(struct gendisk *disk)
return msecs_to_jiffies(intv_msecs);
}
static void __disk_block_events(struct gendisk *disk, bool sync)
/**
* disk_block_events - block and flush disk event checking
* @disk: disk to block events for
*
* On return from this function, it is guaranteed that event checking
* isn't in progress and won't happen until unblocked by
* disk_unblock_events(). Events blocking is counted and the actual
* unblocking happens after the matching number of unblocks are done.
*
* Note that this intentionally does not block event checking from
* disk_clear_events().
*
* CONTEXT:
* Might sleep.
*/
void disk_block_events(struct gendisk *disk)
{
struct disk_events *ev = disk->ev;
unsigned long flags;
bool cancel;
if (!ev)
return;
/*
* Outer mutex ensures that the first blocker completes canceling
* the event work before further blockers are allowed to finish.
*/
mutex_lock(&ev->block_mutex);
spin_lock_irqsave(&ev->lock, flags);
cancel = !ev->block++;
spin_unlock_irqrestore(&ev->lock, flags);
if (cancel) {
if (sync)
cancel_delayed_work_sync(&disk->ev->dwork);
else
cancel_delayed_work(&disk->ev->dwork);
}
if (cancel)
cancel_delayed_work_sync(&disk->ev->dwork);
mutex_unlock(&ev->block_mutex);
}
static void __disk_unblock_events(struct gendisk *disk, bool check_now)
@ -1460,27 +1483,6 @@ out_unlock:
spin_unlock_irqrestore(&ev->lock, flags);
}
/**
* disk_block_events - block and flush disk event checking
* @disk: disk to block events for
*
* On return from this function, it is guaranteed that event checking
* isn't in progress and won't happen until unblocked by
* disk_unblock_events(). Events blocking is counted and the actual
* unblocking happens after the matching number of unblocks are done.
*
* Note that this intentionally does not block event checking from
* disk_clear_events().
*
* CONTEXT:
* Might sleep.
*/
void disk_block_events(struct gendisk *disk)
{
if (disk->ev)
__disk_block_events(disk, true);
}
/**
* disk_unblock_events - unblock disk event checking
* @disk: disk to unblock events for
@ -1508,10 +1510,18 @@ void disk_unblock_events(struct gendisk *disk)
*/
void disk_check_events(struct gendisk *disk)
{
if (disk->ev) {
__disk_block_events(disk, false);
__disk_unblock_events(disk, true);
struct disk_events *ev = disk->ev;
unsigned long flags;
if (!ev)
return;
spin_lock_irqsave(&ev->lock, flags);
if (!ev->block) {
cancel_delayed_work(&ev->dwork);
queue_delayed_work(system_nrt_wq, &ev->dwork, 0);
}
spin_unlock_irqrestore(&ev->lock, flags);
}
EXPORT_SYMBOL_GPL(disk_check_events);
@ -1546,7 +1556,7 @@ unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask)
spin_unlock_irq(&ev->lock);
/* uncondtionally schedule event check and wait for it to finish */
__disk_block_events(disk, true);
disk_block_events(disk);
queue_delayed_work(system_nrt_wq, &ev->dwork, 0);
flush_delayed_work(&ev->dwork);
__disk_unblock_events(disk, false);
@ -1664,7 +1674,7 @@ static ssize_t disk_events_poll_msecs_store(struct device *dev,
if (intv < 0 && intv != -1)
return -EINVAL;
__disk_block_events(disk, true);
disk_block_events(disk);
disk->ev->poll_msecs = intv;
__disk_unblock_events(disk, true);
@ -1750,6 +1760,7 @@ static void disk_add_events(struct gendisk *disk)
INIT_LIST_HEAD(&ev->node);
ev->disk = disk;
spin_lock_init(&ev->lock);
mutex_init(&ev->block_mutex);
ev->block = 1;
ev->poll_msecs = -1;
INIT_DELAYED_WORK(&ev->dwork, disk_events_workfn);
@ -1770,7 +1781,7 @@ static void disk_del_events(struct gendisk *disk)
if (!disk->ev)
return;
__disk_block_events(disk, true);
disk_block_events(disk);
mutex_lock(&disk_events_mutex);
list_del_init(&disk->ev->node);