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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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This commit is contained in:
Jens Axboe 2016-06-29 13:15:19 -06:00
commit df253e8454
1 changed files with 40 additions and 51 deletions
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91
drivers/block/xen-blkfront.c
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@ -207,6 +207,9 @@ struct blkfront_info
struct blk_mq_tag_set tag_set;
struct blkfront_ring_info *rinfo;
unsigned int nr_rings;
/* Save uncomplete reqs and bios for migration. */
struct list_head requests;
struct bio_list bio_list;
};
static unsigned int nr_minors;
@ -2002,69 +2005,22 @@ static int blkif_recover(struct blkfront_info *info)
{
unsigned int i, r_index;
struct request *req, *n;
struct blk_shadow *copy;
int rc;
struct bio *bio, *cloned_bio;
struct bio_list bio_list, merge_bio;
unsigned int segs, offset;
int pending, size;
struct split_bio *split_bio;
struct list_head requests;
blkfront_gather_backend_features(info);
segs = info->max_indirect_segments ? : BLKIF_MAX_SEGMENTS_PER_REQUEST;
blk_queue_max_segments(info->rq, segs);
bio_list_init(&bio_list);
INIT_LIST_HEAD(&requests);
for (r_index = 0; r_index < info->nr_rings; r_index++) {
struct blkfront_ring_info *rinfo;
rinfo = &info->rinfo[r_index];
/* Stage 1: Make a safe copy of the shadow state. */
copy = kmemdup(rinfo->shadow, sizeof(rinfo->shadow),
GFP_NOIO | __GFP_REPEAT | __GFP_HIGH);
if (!copy)
return -ENOMEM;
/* Stage 2: Set up free list. */
memset(&rinfo->shadow, 0, sizeof(rinfo->shadow));
for (i = 0; i < BLK_RING_SIZE(info); i++)
rinfo->shadow[i].req.u.rw.id = i+1;
rinfo->shadow_free = rinfo->ring.req_prod_pvt;
rinfo->shadow[BLK_RING_SIZE(info)-1].req.u.rw.id = 0x0fffffff;
struct blkfront_ring_info *rinfo = &info->rinfo[r_index];
rc = blkfront_setup_indirect(rinfo);
if (rc) {
kfree(copy);
if (rc)
return rc;
}
for (i = 0; i < BLK_RING_SIZE(info); i++) {
/* Not in use? */
if (!copy[i].request)
continue;
/*
* Get the bios in the request so we can re-queue them.
*/
if (copy[i].request->cmd_flags &
(REQ_FLUSH | REQ_FUA | REQ_DISCARD | REQ_SECURE)) {
/*
* Flush operations don't contain bios, so
* we need to requeue the whole request
*/
list_add(&copy[i].request->queuelist, &requests);
continue;
}
merge_bio.head = copy[i].request->bio;
merge_bio.tail = copy[i].request->biotail;
bio_list_merge(&bio_list, &merge_bio);
copy[i].request->bio = NULL;
blk_end_request_all(copy[i].request, 0);
}
kfree(copy);
}
xenbus_switch_state(info->xbdev, XenbusStateConnected);
@ -2079,7 +2035,7 @@ static int blkif_recover(struct blkfront_info *info)
kick_pending_request_queues(rinfo);
}
list_for_each_entry_safe(req, n, &requests, queuelist) {
list_for_each_entry_safe(req, n, &info->requests, queuelist) {
/* Requeue pending requests (flush or discard) */
list_del_init(&req->queuelist);
BUG_ON(req->nr_phys_segments > segs);
@ -2087,7 +2043,7 @@ static int blkif_recover(struct blkfront_info *info)
}
blk_mq_kick_requeue_list(info->rq);
while ((bio = bio_list_pop(&bio_list)) != NULL) {
while ((bio = bio_list_pop(&info->bio_list)) != NULL) {
/* Traverse the list of pending bios and re-queue them */
if (bio_segments(bio) > segs) {
/*
@ -2133,9 +2089,42 @@ static int blkfront_resume(struct xenbus_device *dev)
{
struct blkfront_info *info = dev_get_drvdata(&dev->dev);
int err = 0;
unsigned int i, j;
dev_dbg(&dev->dev, "blkfront_resume: %s\n", dev->nodename);
bio_list_init(&info->bio_list);
INIT_LIST_HEAD(&info->requests);
for (i = 0; i < info->nr_rings; i++) {
struct blkfront_ring_info *rinfo = &info->rinfo[i];
struct bio_list merge_bio;
struct blk_shadow *shadow = rinfo->shadow;
for (j = 0; j < BLK_RING_SIZE(info); j++) {
/* Not in use? */
if (!shadow[j].request)
continue;
/*
* Get the bios in the request so we can re-queue them.
*/
if (shadow[j].request->cmd_flags &
(REQ_FLUSH | REQ_FUA | REQ_DISCARD | REQ_SECURE)) {
/*
* Flush operations don't contain bios, so
* we need to requeue the whole request
*/
list_add(&shadow[j].request->queuelist, &info->requests);
continue;
}
merge_bio.head = shadow[j].request->bio;
merge_bio.tail = shadow[j].request->biotail;
bio_list_merge(&info->bio_list, &merge_bio);
shadow[j].request->bio = NULL;
blk_mq_end_request(shadow[j].request, 0);
}
}
blkif_free(info, info->connected == BLKIF_STATE_CONNECTED);
err = negotiate_mq(info);