diff options
Diffstat (limited to 'drivers/block/xen-blkfront.c')
-rw-r--r-- | drivers/block/xen-blkfront.c | 84 |
1 files changed, 28 insertions, 56 deletions
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c index 9908597c5209..b2bdfa81f929 100644 --- a/drivers/block/xen-blkfront.c +++ b/drivers/block/xen-blkfront.c @@ -1758,17 +1758,13 @@ static int talk_to_blkback(struct xenbus_device *dev, const char *message = NULL; struct xenbus_transaction xbt; int err; - unsigned int i, max_page_order = 0; - unsigned int ring_page_order = 0; + unsigned int i, max_page_order; + unsigned int ring_page_order; - err = xenbus_scanf(XBT_NIL, info->xbdev->otherend, - "max-ring-page-order", "%u", &max_page_order); - if (err != 1) - info->nr_ring_pages = 1; - else { - ring_page_order = min(xen_blkif_max_ring_order, max_page_order); - info->nr_ring_pages = 1 << ring_page_order; - } + max_page_order = xenbus_read_unsigned(info->xbdev->otherend, + "max-ring-page-order", 0); + ring_page_order = min(xen_blkif_max_ring_order, max_page_order); + info->nr_ring_pages = 1 << ring_page_order; for (i = 0; i < info->nr_rings; i++) { struct blkfront_ring_info *rinfo = &info->rinfo[i]; @@ -1877,18 +1873,14 @@ again: static int negotiate_mq(struct blkfront_info *info) { - unsigned int backend_max_queues = 0; - int err; + unsigned int backend_max_queues; unsigned int i; BUG_ON(info->nr_rings); /* Check if backend supports multiple queues. */ - err = xenbus_scanf(XBT_NIL, info->xbdev->otherend, - "multi-queue-max-queues", "%u", &backend_max_queues); - if (err < 0) - backend_max_queues = 1; - + backend_max_queues = xenbus_read_unsigned(info->xbdev->otherend, + "multi-queue-max-queues", 1); info->nr_rings = min(backend_max_queues, xen_blkif_max_queues); /* We need at least one ring. */ if (!info->nr_rings) @@ -2043,8 +2035,9 @@ static int blkif_recover(struct blkfront_info *info) /* Requeue pending requests (flush or discard) */ list_del_init(&req->queuelist); BUG_ON(req->nr_phys_segments > segs); - blk_mq_requeue_request(req); + blk_mq_requeue_request(req, false); } + blk_mq_start_stopped_hw_queues(info->rq, true); blk_mq_kick_requeue_list(info->rq); while ((bio = bio_list_pop(&info->bio_list)) != NULL) { @@ -2195,7 +2188,6 @@ static void blkfront_setup_discard(struct blkfront_info *info) int err; unsigned int discard_granularity; unsigned int discard_alignment; - unsigned int discard_secure; info->feature_discard = 1; err = xenbus_gather(XBT_NIL, info->xbdev->otherend, @@ -2206,10 +2198,9 @@ static void blkfront_setup_discard(struct blkfront_info *info) info->discard_granularity = discard_granularity; info->discard_alignment = discard_alignment; } - err = xenbus_scanf(XBT_NIL, info->xbdev->otherend, - "discard-secure", "%u", &discard_secure); - if (err > 0) - info->feature_secdiscard = !!discard_secure; + info->feature_secdiscard = + !!xenbus_read_unsigned(info->xbdev->otherend, "discard-secure", + 0); } static int blkfront_setup_indirect(struct blkfront_ring_info *rinfo) @@ -2301,16 +2292,11 @@ out_of_memory: */ static void blkfront_gather_backend_features(struct blkfront_info *info) { - int err; - int barrier, flush, discard, persistent; unsigned int indirect_segments; info->feature_flush = 0; info->feature_fua = 0; - err = xenbus_scanf(XBT_NIL, info->xbdev->otherend, - "feature-barrier", "%d", &barrier); - /* * If there's no "feature-barrier" defined, then it means * we're dealing with a very old backend which writes @@ -2318,7 +2304,7 @@ static void blkfront_gather_backend_features(struct blkfront_info *info) * * If there are barriers, then we use flush. */ - if (err > 0 && barrier) { + if (xenbus_read_unsigned(info->xbdev->otherend, "feature-barrier", 0)) { info->feature_flush = 1; info->feature_fua = 1; } @@ -2327,35 +2313,23 @@ static void blkfront_gather_backend_features(struct blkfront_info *info) * And if there is "feature-flush-cache" use that above * barriers. */ - err = xenbus_scanf(XBT_NIL, info->xbdev->otherend, - "feature-flush-cache", "%d", &flush); - - if (err > 0 && flush) { + if (xenbus_read_unsigned(info->xbdev->otherend, "feature-flush-cache", + 0)) { info->feature_flush = 1; info->feature_fua = 0; } - err = xenbus_scanf(XBT_NIL, info->xbdev->otherend, - "feature-discard", "%d", &discard); - - if (err > 0 && discard) + if (xenbus_read_unsigned(info->xbdev->otherend, "feature-discard", 0)) blkfront_setup_discard(info); - err = xenbus_scanf(XBT_NIL, info->xbdev->otherend, - "feature-persistent", "%d", &persistent); - if (err <= 0) - info->feature_persistent = 0; - else - info->feature_persistent = persistent; + info->feature_persistent = + xenbus_read_unsigned(info->xbdev->otherend, + "feature-persistent", 0); - err = xenbus_scanf(XBT_NIL, info->xbdev->otherend, - "feature-max-indirect-segments", "%u", - &indirect_segments); - if (err <= 0) - info->max_indirect_segments = 0; - else - info->max_indirect_segments = min(indirect_segments, - xen_blkif_max_segments); + indirect_segments = xenbus_read_unsigned(info->xbdev->otherend, + "feature-max-indirect-segments", 0); + info->max_indirect_segments = min(indirect_segments, + xen_blkif_max_segments); } /* @@ -2420,11 +2394,9 @@ static void blkfront_connect(struct blkfront_info *info) * provide this. Assume physical sector size to be the same as * sector_size in that case. */ - err = xenbus_scanf(XBT_NIL, info->xbdev->otherend, - "physical-sector-size", "%u", &physical_sector_size); - if (err != 1) - physical_sector_size = sector_size; - + physical_sector_size = xenbus_read_unsigned(info->xbdev->otherend, + "physical-sector-size", + sector_size); blkfront_gather_backend_features(info); for (i = 0; i < info->nr_rings; i++) { err = blkfront_setup_indirect(&info->rinfo[i]); |