diff options
| author | NeilBrown <neilb@suse.de> | 2011-04-18 09:52:22 +0200 |
|---|---|---|
| committer | Jens Axboe <jaxboe@fusionio.com> | 2011-04-18 09:52:22 +0200 |
| commit | 048c9374a749a27f16493cea033fa4a8ff492356 (patch) | |
| tree | 64f520a1a2d2e1a9c30b45e306ce6f901f8f8d49 /block | |
| parent | a1b49cb7e2a7961ec3aa8b64860bf480d4ec9077 (diff) | |
block: Enhance new plugging support to support general callbacks
md/raid requires an unplug callback, but as it does not uses
requests the current code cannot provide one.
So allow arbitrary callbacks to be attached to the blk_plug.
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-core.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/block/blk-core.c b/block/blk-core.c index 78b7b0cb721..77edf051233 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -2638,6 +2638,7 @@ void blk_start_plug(struct blk_plug *plug) plug->magic = PLUG_MAGIC; INIT_LIST_HEAD(&plug->list); + INIT_LIST_HEAD(&plug->cb_list); plug->should_sort = 0; /* @@ -2678,6 +2679,24 @@ static void queue_unplugged(struct request_queue *q, unsigned int depth, q->unplugged_fn(q); } +static void flush_plug_callbacks(struct blk_plug *plug) +{ + LIST_HEAD(callbacks); + + if (list_empty(&plug->cb_list)) + return; + + list_splice_init(&plug->cb_list, &callbacks); + + while (!list_empty(&callbacks)) { + struct blk_plug_cb *cb = list_first_entry(&callbacks, + struct blk_plug_cb, + list); + list_del(&cb->list); + cb->callback(cb); + } +} + void blk_flush_plug_list(struct blk_plug *plug, bool from_schedule) { struct request_queue *q; @@ -2688,6 +2707,7 @@ void blk_flush_plug_list(struct blk_plug *plug, bool from_schedule) BUG_ON(plug->magic != PLUG_MAGIC); + flush_plug_callbacks(plug); if (list_empty(&plug->list)) return; |