* pseudo-fs
*/
-static __cacheline_aligned_in_smp DEFINE_SPINLOCK(bdev_lock);
+static __cacheline_aligned_in_smp DEFINE_MUTEX(bdev_lock);
static struct kmem_cache * bdev_cachep __read_mostly;
static struct inode *bdev_alloc_inode(struct super_block *sb)
*
* Test whether @bdev can be claimed by @holder.
*
- * CONTEXT:
- * spin_lock(&bdev_lock).
- *
* RETURNS:
* %true if @bdev can be claimed, %false otherwise.
*/
{
struct block_device *whole = bdev_whole(bdev);
+ lockdep_assert_held(&bdev_lock);
+
if (bdev->bd_holder) {
/*
* The same holder can always re-claim.
if (WARN_ON_ONCE(!holder))
return -EINVAL;
retry:
- spin_lock(&bdev_lock);
+ mutex_lock(&bdev_lock);
/* if someone else claimed, fail */
if (!bd_may_claim(bdev, holder)) {
- spin_unlock(&bdev_lock);
+ mutex_unlock(&bdev_lock);
return -EBUSY;
}
DEFINE_WAIT(wait);
prepare_to_wait(wq, &wait, TASK_UNINTERRUPTIBLE);
- spin_unlock(&bdev_lock);
+ mutex_unlock(&bdev_lock);
schedule();
finish_wait(wq, &wait);
goto retry;
/* yay, all mine */
whole->bd_claiming = holder;
- spin_unlock(&bdev_lock);
+ mutex_unlock(&bdev_lock);
return 0;
}
EXPORT_SYMBOL_GPL(bd_prepare_to_claim); /* only for the loop driver */
{
struct block_device *whole = bdev_whole(bdev);
- spin_lock(&bdev_lock);
+ mutex_lock(&bdev_lock);
BUG_ON(!bd_may_claim(bdev, holder));
/*
* Note that for a whole device bd_holders will be incremented twice,
bdev->bd_holders++;
bdev->bd_holder = holder;
bd_clear_claiming(whole, holder);
- spin_unlock(&bdev_lock);
+ mutex_unlock(&bdev_lock);
}
/**
*/
void bd_abort_claiming(struct block_device *bdev, void *holder)
{
- spin_lock(&bdev_lock);
+ mutex_lock(&bdev_lock);
bd_clear_claiming(bdev_whole(bdev), holder);
- spin_unlock(&bdev_lock);
+ mutex_unlock(&bdev_lock);
}
EXPORT_SYMBOL(bd_abort_claiming);
* Release a claim on the device. The holder fields are protected with
* bdev_lock. open_mutex is used to synchronize disk_holder unlinking.
*/
- spin_lock(&bdev_lock);
+ mutex_lock(&bdev_lock);
WARN_ON_ONCE(--bdev->bd_holders < 0);
WARN_ON_ONCE(--whole->bd_holders < 0);
if (!bdev->bd_holders) {
}
if (!whole->bd_holders)
whole->bd_holder = NULL;
- spin_unlock(&bdev_lock);
+ mutex_unlock(&bdev_lock);
/*
* If this was the last claim, remove holder link and unblock evpoll if