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Revert "block: add callback function for unplug notification"

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MD can't use this since it really requires us to be able to
keep more than a single piece of state for the unplug. Commit
048c9374 added the required support for MD, so get rid of this
now unused code.

This reverts commit f75664570d.

Conflicts:

	block/blk-core.c

Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Jens Axboe 2011-04-18 09:54:05 +02:00
commit b4cb290e0a
3 changed files with 0 additions and 22 deletions
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16
block/blk-settings.c
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@ -790,22 +790,6 @@ void blk_queue_flush(struct request_queue *q, unsigned int flush)
}
EXPORT_SYMBOL_GPL(blk_queue_flush);
/**
* blk_queue_unplugged - register a callback for an unplug event
* @q: the request queue for the device
* @fn: the function to call
*
* Some stacked drivers may need to know when IO is dispatched on an
* unplug event. By registrering a callback here, they will be notified
* when someone flushes their on-stack queue plug. The function will be
* called with the queue lock held.
*/
void blk_queue_unplugged(struct request_queue *q, unplugged_fn *fn)
{
q->unplugged_fn = fn;
}
EXPORT_SYMBOL(blk_queue_unplugged);
static int __init blk_settings_init(void)
{
blk_max_low_pfn = max_low_pfn - 1;