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Merge branch 'stable/for-jens-4.7' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen into for-linus

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Konrad writes:

Thishas two fixes for a guest migrating from host that
has multi-queue to one without it (and vice-versa).
This commit is contained in:
Jens Axboe 2016-06-09 09:49:55 -06:00
commit 1decabc1a7
1 changed files with 22 additions and 13 deletions
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35
drivers/block/xen-blkfront.c
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@ -874,8 +874,12 @@ static int blkif_queue_rq(struct blk_mq_hw_ctx *hctx,
const struct blk_mq_queue_data *qd)
{
unsigned long flags;
struct blkfront_ring_info *rinfo = (struct blkfront_ring_info *)hctx->driver_data;
int qid = hctx->queue_num;
struct blkfront_info *info = hctx->queue->queuedata;
struct blkfront_ring_info *rinfo = NULL;
BUG_ON(info->nr_rings <= qid);
rinfo = &info->rinfo[qid];
blk_mq_start_request(qd->rq);
spin_lock_irqsave(&rinfo->ring_lock, flags);
if (RING_FULL(&rinfo->ring))
@ -901,20 +905,9 @@ out_busy:
return BLK_MQ_RQ_QUEUE_BUSY;
}
static int blk_mq_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
unsigned int index)
{
struct blkfront_info *info = (struct blkfront_info *)data;
BUG_ON(info->nr_rings <= index);
hctx->driver_data = &info->rinfo[index];
return 0;
}
static struct blk_mq_ops blkfront_mq_ops = {
.queue_rq = blkif_queue_rq,
.map_queue = blk_mq_map_queue,
.init_hctx = blk_mq_init_hctx,
};
static int xlvbd_init_blk_queue(struct gendisk *gd, u16 sector_size,
@ -950,6 +943,7 @@ static int xlvbd_init_blk_queue(struct gendisk *gd, u16 sector_size,
return PTR_ERR(rq);
}
rq->queuedata = info;
queue_flag_set_unlocked(QUEUE_FLAG_VIRT, rq);
if (info->feature_discard) {
@ -2149,6 +2143,8 @@ static int blkfront_resume(struct xenbus_device *dev)
return err;
err = talk_to_blkback(dev, info);
if (!err)
blk_mq_update_nr_hw_queues(&info->tag_set, info->nr_rings);
/*
* We have to wait for the backend to switch to
@ -2485,10 +2481,23 @@ static void blkback_changed(struct xenbus_device *dev,
break;
case XenbusStateConnected:
if (dev->state != XenbusStateInitialised) {
/*
* talk_to_blkback sets state to XenbusStateInitialised
* and blkfront_connect sets it to XenbusStateConnected
* (if connection went OK).
*
* If the backend (or toolstack) decides to poke at backend
* state (and re-trigger the watch by setting the state repeatedly
* to XenbusStateConnected (4)) we need to deal with this.
* This is allowed as this is used to communicate to the guest
* that the size of disk has changed!
*/
if ((dev->state != XenbusStateInitialised) &&
(dev->state != XenbusStateConnected)) {
if (talk_to_blkback(dev, info))
break;
}
blkfront_connect(info);
break;