virtblk_abort_queue() will be called by the block layer when cleans up
the queue. blk_cleanup_queue -> blk_drain_queue() -> q->abort_queue_fn(q)
virtblk_abort_queue()
1) Abort requests in block which is not dispatched to driver
2) Abort requests already dispatched to driver
3) Wake up processes which is sleeping on get_request_wait()
This makes hot-unplug a disk which is busy serving I/O success.
Cc: Rusty Russell <ru...@rustcorp.com.au>
Cc: "Michael S. Tsirkin" <m...@redhat.com>
Cc: virtualizat...@lists.linux-foundation.org
Cc: kvm@vger.kernel.org
Cc: Jens Axboe <ax...@kernel.dk>
Cc: Tejun Heo <t...@kernel.org>
Cc: linux-fsde...@vger.kernel.org
Signed-off-by: Asias He <as...@redhat.com>
---
drivers/block/virtio_blk.c | 38 +++++++++++++++++++++++++++-----------
1 file changed, 27 insertions(+), 11 deletions(-)
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index 7d5f5b0..ba35509 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -182,6 +182,31 @@ static bool do_req(struct request_queue *q, struct
virtio_blk *vblk,
return true;
}
+void virtblk_abort_queue(struct request_queue *q)
+{
+ struct virtio_blk *vblk = q->queuedata;
+ struct virtblk_req *vbr;
+ int i;
+
+ /* Abort requests in block layer. */
+ elv_abort_queue(q);
+
+ /* Abort requests dispatched to driver. */
+ while ((vbr = virtqueue_detach_unused_buf(vblk->vq))) {
+ vbr->req->cmd_flags |= REQ_QUIET;
+ __blk_end_request_all(vbr->req, -EIO);
+ mempool_free(vbr, vblk->pool);
+ }
+
+ /* Wake up threads sleeping on get_request_wait() */
+ for (i = 0; i < ARRAY_SIZE(q->rq.wait); i++) {
+ if (waitqueue_active(&q->rq.wait[i]))
+ wake_up_all(&q->rq.wait[i]);
+ }
+
+ return;
+}
+
static void do_virtblk_request(struct request_queue *q)
{
struct virtio_blk *vblk = q->queuedata;
@@ -462,6 +487,8 @@ static int __devinit virtblk_probe(struct virtio_device
*vdev)
goto out_put_disk;
}
+ blk_queue_abort_queue(q, virtblk_abort_queue);
+
q->queuedata = vblk;
virtblk_name_format("vd", index, vblk->disk->disk_name, DISK_NAME_LEN);
@@ -576,8 +603,6 @@ static void __devexit virtblk_remove(struct virtio_device
*vdev)
{
struct virtio_blk *vblk = vdev->priv;
int index = vblk->index;
- struct virtblk_req *vbr;
- unsigned long flags;
/* Prevent config work handler from accessing the device. */
mutex_lock(&vblk->config_lock);
@@ -591,15 +616,6 @@ static void __devexit virtblk_remove(struct virtio_device
*vdev)
flush_work(&vblk->config_work);
-
- /* Abort requests dispatched to driver. */
- spin_lock_irqsave(&vblk->lock, flags);
- while ((vbr = virtqueue_detach_unused_buf(vblk->vq))) {
- __blk_end_request_all(vbr->req, -EIO);
- mempool_free(vbr, vblk->pool);
- }
- spin_unlock_irqrestore(&vblk->lock, flags);
-
blk_cleanup_queue(vblk->disk->queue);
put_disk(vblk->disk);
mempool_destroy(vblk->pool);
--
1.7.10.1
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