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block: add callback function for unplug notification

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MD would like to know when a queue is unplugged, so it can flush
it's bitmap writes. Add such a callback.

Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Jens Axboe 2011-04-12 10:17:31 +02:00
commit f75664570d
3 changed files with 22 additions and 0 deletions
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16
block/blk-settings.c
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@ -790,6 +790,22 @@ 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;