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block: replace icq->changed with icq->flags

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icq->changed was used for ICQ_*_CHANGED bits.  Rename it to flags and
access it under ioc->lock instead of using atomic bitops.
ioc_get_changed() is added so that the changed part can be fetched and
cleared as before.

icq->flags will be used to carry other flags.

Signed-off-by: Tejun Heo <[email protected]>
Tested-by: Shaohua Li <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Tejun Heo 2012-02-15 09:45:49 +01:00 • committed by Jens Axboe
commit d705ae6b13
3 changed files with 38 additions and 13 deletions
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30
block/blk-ioc.c
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@ -363,13 +363,13 @@ struct io_cq *ioc_create_icq(struct request_queue *q, gfp_t gfp_mask)
return icq;
}
void ioc_set_changed(struct io_context *ioc, int which)
void ioc_set_icq_flags(struct io_context *ioc, unsigned int flags)
{
struct io_cq *icq;
struct hlist_node *n;
hlist_for_each_entry(icq, n, &ioc->icq_list, ioc_node)
set_bit(which, &icq->changed);
icq->flags |= flags;
}
/**
@ -387,7 +387,7 @@ void ioc_ioprio_changed(struct io_context *ioc, int ioprio)
spin_lock_irqsave(&ioc->lock, flags);
ioc->ioprio = ioprio;
ioc_set_changed(ioc, ICQ_IOPRIO_CHANGED);
ioc_set_icq_flags(ioc, ICQ_IOPRIO_CHANGED);
spin_unlock_irqrestore(&ioc->lock, flags);
}
@ -404,11 +404,33 @@ void ioc_cgroup_changed(struct io_context *ioc)
unsigned long flags;
spin_lock_irqsave(&ioc->lock, flags);
ioc_set_changed(ioc, ICQ_CGROUP_CHANGED);
ioc_set_icq_flags(ioc, ICQ_CGROUP_CHANGED);
spin_unlock_irqrestore(&ioc->lock, flags);
}
EXPORT_SYMBOL(ioc_cgroup_changed);
/**
* icq_get_changed - fetch and clear icq changed mask
* @icq: icq of interest
*
* Fetch and clear ICQ_*_CHANGED bits from @icq. Grabs and releases
* @icq->ioc->lock.
*/
unsigned icq_get_changed(struct io_cq *icq)
{
unsigned int changed = 0;
unsigned long flags;
if (unlikely(icq->flags & ICQ_CHANGED_MASK)) {
spin_lock_irqsave(&icq->ioc->lock, flags);
changed = icq->flags & ICQ_CHANGED_MASK;
icq->flags &= ~ICQ_CHANGED_MASK;
spin_unlock_irqrestore(&icq->ioc->lock, flags);
}
return changed;
}
EXPORT_SYMBOL(icq_get_changed);
static int __init blk_ioc_init(void)
{
iocontext_cachep = kmem_cache_create("blkdev_ioc",