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Merge branch 'for-linus' of git://git.kernel.dk/linux-block

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* 'for-linus' of git://git.kernel.dk/linux-block:
  block: add REQ_SECURE to REQ_COMMON_MASK
  block: use the passed in @bdev when claiming if partno is zero
  block: Add __attribute__((format(printf...) and fix fallout
  block: make disk_block_events() properly wait for work cancellation
  block: remove non-syncing __disk_block_events() and fold it into disk_block_events()
  block: don't use non-syncing event blocking in disk_check_events()
  cfq-iosched: fix locking around ioc->ioc_data assignment
This commit is contained in:
Linus Torvalds 2011-06-24 08:42:35 -07:00
commit 5220cc9382
6 changed files with 73 additions and 45 deletions
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4
block/blk-throttle.c
View File

@ -927,7 +927,7 @@ static int throtl_dispatch(struct request_queue *q)
bio_list_init(&bio_list_on_stack);
throtl_log(td, "dispatch nr_queued=%lu read=%u write=%u",
throtl_log(td, "dispatch nr_queued=%d read=%u write=%u",
total_nr_queued(td), td->nr_queued[READ],
td->nr_queued[WRITE]);
@ -1204,7 +1204,7 @@ int blk_throtl_bio(struct request_queue *q, struct bio **biop)
}
queue_bio:
throtl_log_tg(td, tg, "[%c] bio. bdisp=%u sz=%u bps=%llu"
throtl_log_tg(td, tg, "[%c] bio. bdisp=%llu sz=%u bps=%llu"
" iodisp=%u iops=%u queued=%d/%d",
rw == READ ? 'R' : 'W',
tg->bytes_disp[rw], bio->bi_size, tg->bps[rw],

16
block/cfq-iosched.c
View File

@ -988,9 +988,10 @@ static void cfq_group_served(struct cfq_data *cfqd, struct cfq_group *cfqg,
cfq_log_cfqg(cfqd, cfqg, "served: vt=%llu min_vt=%llu", cfqg->vdisktime,
st->min_vdisktime);
cfq_log_cfqq(cfqq->cfqd, cfqq, "sl_used=%u disp=%u charge=%u iops=%u"
" sect=%u", used_sl, cfqq->slice_dispatch, charge,
iops_mode(cfqd), cfqq->nr_sectors);
cfq_log_cfqq(cfqq->cfqd, cfqq,
"sl_used=%u disp=%u charge=%u iops=%u sect=%lu",
used_sl, cfqq->slice_dispatch, charge,
iops_mode(cfqd), cfqq->nr_sectors);
cfq_blkiocg_update_timeslice_used(&cfqg->blkg, used_sl,
unaccounted_sl);
cfq_blkiocg_set_start_empty_time(&cfqg->blkg);
@ -2023,8 +2024,8 @@ static void cfq_arm_slice_timer(struct cfq_data *cfqd)
*/
if (sample_valid(cic->ttime_samples) &&
(cfqq->slice_end - jiffies < cic->ttime_mean)) {
cfq_log_cfqq(cfqd, cfqq, "Not idling. think_time:%d",
cic->ttime_mean);
cfq_log_cfqq(cfqd, cfqq, "Not idling. think_time:%lu",
cic->ttime_mean);
return;
}
@ -2772,8 +2773,11 @@ static void __cfq_exit_single_io_context(struct cfq_data *cfqd,
smp_wmb();
cic->key = cfqd_dead_key(cfqd);
if (ioc->ioc_data == cic)
if (rcu_dereference(ioc->ioc_data) == cic) {
spin_lock(&ioc->lock);
rcu_assign_pointer(ioc->ioc_data, NULL);
spin_unlock(&ioc->lock);
}
if (cic->cfqq[BLK_RW_ASYNC]) {
cfq_exit_cfqq(cfqd, cic->cfqq[BLK_RW_ASYNC]);

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);

14
fs/block_dev.c
View File

@ -762,7 +762,19 @@ static struct block_device *bd_start_claiming(struct block_device *bdev,
if (!disk)
return ERR_PTR(-ENXIO);
whole = bdget_disk(disk, 0);
/*
* Normally, @bdev should equal what's returned from bdget_disk()
* if partno is 0; however, some drivers (floppy) use multiple
* bdev's for the same physical device and @bdev may be one of the
* aliases. Keep @bdev if partno is 0. This means claimer
* tracking is broken for those devices but it has always been that
* way.
*/
if (partno)
whole = bdget_disk(disk, 0);
else
whole = bdgrab(bdev);
module_put(disk->fops->owner);
put_disk(disk);
if (!whole)

2
include/linux/blk_types.h
View File

@ -167,7 +167,7 @@ enum rq_flag_bits {
(REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER)
#define REQ_COMMON_MASK \
(REQ_WRITE | REQ_FAILFAST_MASK | REQ_SYNC | REQ_META | REQ_DISCARD | \
REQ_NOIDLE | REQ_FLUSH | REQ_FUA)
REQ_NOIDLE | REQ_FLUSH | REQ_FUA | REQ_SECURE)
#define REQ_CLONE_MASK REQ_COMMON_MASK
#define REQ_RAHEAD (1 << __REQ_RAHEAD)

3
include/linux/blktrace_api.h
View File

@ -169,7 +169,8 @@ extern void blk_trace_shutdown(struct request_queue *);
extern int do_blk_trace_setup(struct request_queue *q, char *name,
dev_t dev, struct block_device *bdev,
struct blk_user_trace_setup *buts);
extern void __trace_note_message(struct blk_trace *, const char *fmt, ...);
extern __attribute__((format(printf, 2, 3)))
void __trace_note_message(struct blk_trace *, const char *fmt, ...);
/**
* blk_add_trace_msg - Add a (simple) message to the blktrace stream