diff options
Diffstat (limited to 'drivers/block/virtio_blk.c')
-rw-r--r-- | drivers/block/virtio_blk.c | 412 |
1 files changed, 309 insertions, 103 deletions
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c index 6ae38776e30e..19da5defd734 100644 --- a/drivers/block/virtio_blk.c +++ b/drivers/block/virtio_blk.c @@ -37,6 +37,10 @@ MODULE_PARM_DESC(num_request_queues, "0 for no limit. " "Values > nr_cpu_ids truncated to nr_cpu_ids."); +static unsigned int poll_queues; +module_param(poll_queues, uint, 0644); +MODULE_PARM_DESC(poll_queues, "The number of dedicated virtqueues for polling I/O"); + static int major; static DEFINE_IDA(vd_index_ida); @@ -69,21 +73,12 @@ struct virtio_blk { /* Process context for config space updates */ struct work_struct config_work; - /* - * Tracks references from block_device_operations open/release and - * virtio_driver probe/remove so this object can be freed once no - * longer in use. - */ - refcount_t refs; - - /* What host tells us, plus 2 for header & tailer. */ - unsigned int sg_elems; - /* Ida index - used to track minor number allocations. */ int index; /* num of vqs */ int num_vqs; + int io_queues[HCTX_MAX_TYPES]; struct virtio_blk_vq *vqs; }; @@ -106,8 +101,15 @@ static inline blk_status_t virtblk_result(struct virtblk_req *vbr) } } -static int virtblk_add_req(struct virtqueue *vq, struct virtblk_req *vbr, - struct scatterlist *data_sg, bool have_data) +static inline struct virtio_blk_vq *get_virtio_blk_vq(struct blk_mq_hw_ctx *hctx) +{ + struct virtio_blk *vblk = hctx->queue->queuedata; + struct virtio_blk_vq *vq = &vblk->vqs[hctx->queue_num]; + + return vq; +} + +static int virtblk_add_req(struct virtqueue *vq, struct virtblk_req *vbr) { struct scatterlist hdr, status, *sgs[3]; unsigned int num_out = 0, num_in = 0; @@ -115,11 +117,11 @@ static int virtblk_add_req(struct virtqueue *vq, struct virtblk_req *vbr, sg_init_one(&hdr, &vbr->out_hdr, sizeof(vbr->out_hdr)); sgs[num_out++] = &hdr; - if (have_data) { + if (vbr->sg_table.nents) { if (vbr->out_hdr.type & cpu_to_virtio32(vq->vdev, VIRTIO_BLK_T_OUT)) - sgs[num_out++] = data_sg; + sgs[num_out++] = vbr->sg_table.sgl; else - sgs[num_out + num_in++] = data_sg; + sgs[num_out + num_in++] = vbr->sg_table.sgl; } sg_init_one(&status, &vbr->status, sizeof(vbr->status)); @@ -128,7 +130,7 @@ static int virtblk_add_req(struct virtqueue *vq, struct virtblk_req *vbr, return virtqueue_add_sgs(vq, sgs, num_out, num_in, vbr, GFP_ATOMIC); } -static int virtblk_setup_discard_write_zeroes(struct request *req, bool unmap) +static int virtblk_setup_discard_write_zeroes_erase(struct request *req, bool unmap) { unsigned short segments = blk_rq_nr_discard_segments(req); unsigned short n = 0; @@ -238,6 +240,9 @@ static blk_status_t virtblk_setup_cmd(struct virtio_device *vdev, type = VIRTIO_BLK_T_WRITE_ZEROES; unmap = !(req->cmd_flags & REQ_NOUNMAP); break; + case REQ_OP_SECURE_ERASE: + type = VIRTIO_BLK_T_SECURE_ERASE; + break; case REQ_OP_DRV_IN: type = VIRTIO_BLK_T_GET_ID; break; @@ -249,8 +254,9 @@ static blk_status_t virtblk_setup_cmd(struct virtio_device *vdev, vbr->out_hdr.type = cpu_to_virtio32(vdev, type); vbr->out_hdr.ioprio = cpu_to_virtio32(vdev, req_get_ioprio(req)); - if (type == VIRTIO_BLK_T_DISCARD || type == VIRTIO_BLK_T_WRITE_ZEROES) { - if (virtblk_setup_discard_write_zeroes(req, unmap)) + if (type == VIRTIO_BLK_T_DISCARD || type == VIRTIO_BLK_T_WRITE_ZEROES || + type == VIRTIO_BLK_T_SECURE_ERASE) { + if (virtblk_setup_discard_write_zeroes_erase(req, unmap)) return BLK_STS_RESOURCE; } @@ -309,6 +315,28 @@ static void virtio_commit_rqs(struct blk_mq_hw_ctx *hctx) virtqueue_notify(vq->vq); } +static blk_status_t virtblk_prep_rq(struct blk_mq_hw_ctx *hctx, + struct virtio_blk *vblk, + struct request *req, + struct virtblk_req *vbr) +{ + blk_status_t status; + + status = virtblk_setup_cmd(vblk->vdev, req, vbr); + if (unlikely(status)) + return status; + + vbr->sg_table.nents = virtblk_map_data(hctx, req, vbr); + if (unlikely(vbr->sg_table.nents < 0)) { + virtblk_cleanup_cmd(req); + return BLK_STS_RESOURCE; + } + + blk_mq_start_request(req); + + return BLK_STS_OK; +} + static blk_status_t virtio_queue_rq(struct blk_mq_hw_ctx *hctx, const struct blk_mq_queue_data *bd) { @@ -316,28 +344,17 @@ static blk_status_t virtio_queue_rq(struct blk_mq_hw_ctx *hctx, struct request *req = bd->rq; struct virtblk_req *vbr = blk_mq_rq_to_pdu(req); unsigned long flags; - int num; int qid = hctx->queue_num; bool notify = false; blk_status_t status; int err; - BUG_ON(req->nr_phys_segments + 2 > vblk->sg_elems); - - status = virtblk_setup_cmd(vblk->vdev, req, vbr); + status = virtblk_prep_rq(hctx, vblk, req, vbr); if (unlikely(status)) return status; - blk_mq_start_request(req); - - num = virtblk_map_data(hctx, req, vbr); - if (unlikely(num < 0)) { - virtblk_cleanup_cmd(req); - return BLK_STS_RESOURCE; - } - spin_lock_irqsave(&vblk->vqs[qid].lock, flags); - err = virtblk_add_req(vblk->vqs[qid].vq, vbr, vbr->sg_table.sgl, num); + err = virtblk_add_req(vblk->vqs[qid].vq, vbr); if (err) { virtqueue_kick(vblk->vqs[qid].vq); /* Don't stop the queue if -ENOMEM: we may have failed to @@ -367,6 +384,74 @@ static blk_status_t virtio_queue_rq(struct blk_mq_hw_ctx *hctx, return BLK_STS_OK; } +static bool virtblk_prep_rq_batch(struct request *req) +{ + struct virtio_blk *vblk = req->mq_hctx->queue->queuedata; + struct virtblk_req *vbr = blk_mq_rq_to_pdu(req); + + req->mq_hctx->tags->rqs[req->tag] = req; + + return virtblk_prep_rq(req->mq_hctx, vblk, req, vbr) == BLK_STS_OK; +} + +static bool virtblk_add_req_batch(struct virtio_blk_vq *vq, + struct request **rqlist) +{ + unsigned long flags; + int err; + bool kick; + + spin_lock_irqsave(&vq->lock, flags); + + while (!rq_list_empty(*rqlist)) { + struct request *req = rq_list_pop(rqlist); + struct virtblk_req *vbr = blk_mq_rq_to_pdu(req); + + err = virtblk_add_req(vq->vq, vbr); + if (err) { + virtblk_unmap_data(req, vbr); + virtblk_cleanup_cmd(req); + blk_mq_requeue_request(req, true); + } + } + + kick = virtqueue_kick_prepare(vq->vq); + spin_unlock_irqrestore(&vq->lock, flags); + + return kick; +} + +static void virtio_queue_rqs(struct request **rqlist) +{ + struct request *req, *next, *prev = NULL; + struct request *requeue_list = NULL; + + rq_list_for_each_safe(rqlist, req, next) { + struct virtio_blk_vq *vq = get_virtio_blk_vq(req->mq_hctx); + bool kick; + + if (!virtblk_prep_rq_batch(req)) { + rq_list_move(rqlist, &requeue_list, req, prev); + req = prev; + if (!req) + continue; + } + + if (!next || req->mq_hctx != next->mq_hctx) { + req->rq_next = NULL; + kick = virtblk_add_req_batch(vq, rqlist); + if (kick) + virtqueue_notify(vq->vq); + + *rqlist = next; + prev = NULL; + } else + prev = req; + } + + *rqlist = requeue_list; +} + /* return id (s/n) string for *disk to *id_str */ static int virtblk_get_id(struct gendisk *disk, char *id_str) @@ -384,50 +469,13 @@ static int virtblk_get_id(struct gendisk *disk, char *id_str) if (err) goto out; - blk_execute_rq(vblk->disk, req, false); + blk_execute_rq(req, false); err = blk_status_to_errno(virtblk_result(blk_mq_rq_to_pdu(req))); out: blk_mq_free_request(req); return err; } -static void virtblk_get(struct virtio_blk *vblk) -{ - refcount_inc(&vblk->refs); -} - -static void virtblk_put(struct virtio_blk *vblk) -{ - if (refcount_dec_and_test(&vblk->refs)) { - ida_simple_remove(&vd_index_ida, vblk->index); - mutex_destroy(&vblk->vdev_mutex); - kfree(vblk); - } -} - -static int virtblk_open(struct block_device *bd, fmode_t mode) -{ - struct virtio_blk *vblk = bd->bd_disk->private_data; - int ret = 0; - - mutex_lock(&vblk->vdev_mutex); - - if (vblk->vdev) - virtblk_get(vblk); - else - ret = -ENXIO; - - mutex_unlock(&vblk->vdev_mutex); - return ret; -} - -static void virtblk_release(struct gendisk *disk, fmode_t mode) -{ - struct virtio_blk *vblk = disk->private_data; - - virtblk_put(vblk); -} - /* We provide getgeo only to please some old bootloader/partitioning tools */ static int virtblk_getgeo(struct block_device *bd, struct hd_geometry *geo) { @@ -460,11 +508,19 @@ out: return ret; } +static void virtblk_free_disk(struct gendisk *disk) +{ + struct virtio_blk *vblk = disk->private_data; + + ida_simple_remove(&vd_index_ida, vblk->index); + mutex_destroy(&vblk->vdev_mutex); + kfree(vblk); +} + static const struct block_device_operations virtblk_fops = { - .owner = THIS_MODULE, - .open = virtblk_open, - .release = virtblk_release, - .getgeo = virtblk_getgeo, + .owner = THIS_MODULE, + .getgeo = virtblk_getgeo, + .free_disk = virtblk_free_disk, }; static int index_to_minor(int index) @@ -553,6 +609,7 @@ static int init_vq(struct virtio_blk *vblk) const char **names; struct virtqueue **vqs; unsigned short num_vqs; + unsigned int num_poll_vqs; struct virtio_device *vdev = vblk->vdev; struct irq_affinity desc = { 0, }; @@ -561,6 +618,7 @@ static int init_vq(struct virtio_blk *vblk) &num_vqs); if (err) num_vqs = 1; + if (!err && !num_vqs) { dev_err(&vdev->dev, "MQ advertised but zero queues reported\n"); return -EINVAL; @@ -570,6 +628,17 @@ static int init_vq(struct virtio_blk *vblk) min_not_zero(num_request_queues, nr_cpu_ids), num_vqs); + num_poll_vqs = min_t(unsigned int, poll_queues, num_vqs - 1); + + vblk->io_queues[HCTX_TYPE_DEFAULT] = num_vqs - num_poll_vqs; + vblk->io_queues[HCTX_TYPE_READ] = 0; + vblk->io_queues[HCTX_TYPE_POLL] = num_poll_vqs; + + dev_info(&vdev->dev, "%d/%d/%d default/read/poll queues\n", + vblk->io_queues[HCTX_TYPE_DEFAULT], + vblk->io_queues[HCTX_TYPE_READ], + vblk->io_queues[HCTX_TYPE_POLL]); + vblk->vqs = kmalloc_array(num_vqs, sizeof(*vblk->vqs), GFP_KERNEL); if (!vblk->vqs) return -ENOMEM; @@ -582,12 +651,18 @@ static int init_vq(struct virtio_blk *vblk) goto out; } - for (i = 0; i < num_vqs; i++) { + for (i = 0; i < num_vqs - num_poll_vqs; i++) { callbacks[i] = virtblk_done; snprintf(vblk->vqs[i].name, VQ_NAME_LEN, "req.%d", i); names[i] = vblk->vqs[i].name; } + for (; i < num_vqs; i++) { + callbacks[i] = NULL; + snprintf(vblk->vqs[i].name, VQ_NAME_LEN, "req_poll.%d", i); + names[i] = vblk->vqs[i].name; + } + /* Discover virtqueues and write information to configuration. */ err = virtio_find_vqs(vdev, num_vqs, vqs, callbacks, names, &desc); if (err) @@ -730,19 +805,79 @@ static const struct attribute_group *virtblk_attr_groups[] = { NULL, }; -static int virtblk_map_queues(struct blk_mq_tag_set *set) +static void virtblk_map_queues(struct blk_mq_tag_set *set) { struct virtio_blk *vblk = set->driver_data; + int i, qoff; - return blk_mq_virtio_map_queues(&set->map[HCTX_TYPE_DEFAULT], - vblk->vdev, 0); + for (i = 0, qoff = 0; i < set->nr_maps; i++) { + struct blk_mq_queue_map *map = &set->map[i]; + + map->nr_queues = vblk->io_queues[i]; + map->queue_offset = qoff; + qoff += map->nr_queues; + + if (map->nr_queues == 0) + continue; + + /* + * Regular queues have interrupts and hence CPU affinity is + * defined by the core virtio code, but polling queues have + * no interrupts so we let the block layer assign CPU affinity. + */ + if (i == HCTX_TYPE_POLL) + blk_mq_map_queues(&set->map[i]); + else + blk_mq_virtio_map_queues(&set->map[i], vblk->vdev, 0); + } +} + +static void virtblk_complete_batch(struct io_comp_batch *iob) +{ + struct request *req; + + rq_list_for_each(&iob->req_list, req) { + virtblk_unmap_data(req, blk_mq_rq_to_pdu(req)); + virtblk_cleanup_cmd(req); + } + blk_mq_end_request_batch(iob); +} + +static int virtblk_poll(struct blk_mq_hw_ctx *hctx, struct io_comp_batch *iob) +{ + struct virtio_blk *vblk = hctx->queue->queuedata; + struct virtio_blk_vq *vq = get_virtio_blk_vq(hctx); + struct virtblk_req *vbr; + unsigned long flags; + unsigned int len; + int found = 0; + + spin_lock_irqsave(&vq->lock, flags); + + while ((vbr = virtqueue_get_buf(vq->vq, &len)) != NULL) { + struct request *req = blk_mq_rq_from_pdu(vbr); + + found++; + if (!blk_mq_add_to_batch(req, iob, vbr->status, + virtblk_complete_batch)) + blk_mq_complete_request(req); + } + + if (found) + blk_mq_start_stopped_hw_queues(vblk->disk->queue, true); + + spin_unlock_irqrestore(&vq->lock, flags); + + return found; } static const struct blk_mq_ops virtio_mq_ops = { .queue_rq = virtio_queue_rq, + .queue_rqs = virtio_queue_rqs, .commit_rqs = virtio_commit_rqs, .complete = virtblk_request_done, .map_queues = virtblk_map_queues, + .poll = virtblk_poll, }; static unsigned int virtblk_queue_depth; @@ -755,6 +890,8 @@ static int virtblk_probe(struct virtio_device *vdev) int err, index; u32 v, blk_size, max_size, sg_elems, opt_io_size; + u32 max_discard_segs = 0; + u32 discard_granularity = 0; u16 min_io_size; u8 physical_block_exp, alignment_offset; unsigned int queue_depth; @@ -783,20 +920,15 @@ static int virtblk_probe(struct virtio_device *vdev) /* Prevent integer overflows and honor max vq size */ sg_elems = min_t(u32, sg_elems, VIRTIO_BLK_MAX_SG_ELEMS - 2); - /* We need extra sg elements at head and tail. */ - sg_elems += 2; vdev->priv = vblk = kmalloc(sizeof(*vblk), GFP_KERNEL); if (!vblk) { err = -ENOMEM; goto out_free_index; } - /* This reference is dropped in virtblk_remove(). */ - refcount_set(&vblk->refs, 1); mutex_init(&vblk->vdev_mutex); vblk->vdev = vdev; - vblk->sg_elems = sg_elems; INIT_WORK(&vblk->config_work, virtblk_config_changed_work); @@ -824,6 +956,9 @@ static int virtblk_probe(struct virtio_device *vdev) sizeof(struct scatterlist) * VIRTIO_BLK_INLINE_SG_CNT; vblk->tag_set.driver_data = vblk; vblk->tag_set.nr_hw_queues = vblk->num_vqs; + vblk->tag_set.nr_maps = 1; + if (vblk->io_queues[HCTX_TYPE_POLL]) + vblk->tag_set.nr_maps = 3; err = blk_mq_alloc_tag_set(&vblk->tag_set); if (err) @@ -843,7 +978,6 @@ static int virtblk_probe(struct virtio_device *vdev) vblk->disk->minors = 1 << PART_BITS; vblk->disk->private_data = vblk; vblk->disk->fops = &virtblk_fops; - vblk->disk->flags |= GENHD_FL_EXT_DEVT; vblk->index = index; /* configure queue flush support */ @@ -854,7 +988,7 @@ static int virtblk_probe(struct virtio_device *vdev) set_disk_ro(vblk->disk, 1); /* We can handle whatever the host told us to handle. */ - blk_queue_max_segments(q, vblk->sg_elems-2); + blk_queue_max_segments(q, sg_elems); /* No real sector limit. */ blk_queue_max_hw_sectors(q, -1U); @@ -914,23 +1048,15 @@ static int virtblk_probe(struct virtio_device *vdev) blk_queue_io_opt(q, blk_size * opt_io_size); if (virtio_has_feature(vdev, VIRTIO_BLK_F_DISCARD)) { - q->limits.discard_granularity = blk_size; - virtio_cread(vdev, struct virtio_blk_config, - discard_sector_alignment, &v); - q->limits.discard_alignment = v ? v << SECTOR_SHIFT : 0; + discard_sector_alignment, &discard_granularity); virtio_cread(vdev, struct virtio_blk_config, max_discard_sectors, &v); blk_queue_max_discard_sectors(q, v ? v : UINT_MAX); virtio_cread(vdev, struct virtio_blk_config, max_discard_seg, - &v); - blk_queue_max_discard_segments(q, - min_not_zero(v, - MAX_DISCARD_SEGMENTS)); - - blk_queue_flag_set(QUEUE_FLAG_DISCARD, q); + &max_discard_segs); } if (virtio_has_feature(vdev, VIRTIO_BLK_F_WRITE_ZEROES)) { @@ -939,6 +1065,85 @@ static int virtblk_probe(struct virtio_device *vdev) blk_queue_max_write_zeroes_sectors(q, v ? v : UINT_MAX); } + /* The discard and secure erase limits are combined since the Linux + * block layer uses the same limit for both commands. + * + * If both VIRTIO_BLK_F_SECURE_ERASE and VIRTIO_BLK_F_DISCARD features + * are negotiated, we will use the minimum between the limits. + * + * discard sector alignment is set to the minimum between discard_sector_alignment + * and secure_erase_sector_alignment. + * + * max discard sectors is set to the minimum between max_discard_seg and + * max_secure_erase_seg. + */ + if (virtio_has_feature(vdev, VIRTIO_BLK_F_SECURE_ERASE)) { + + virtio_cread(vdev, struct virtio_blk_config, + secure_erase_sector_alignment, &v); + + /* secure_erase_sector_alignment should not be zero, the device should set a + * valid number of sectors. + */ + if (!v) { + dev_err(&vdev->dev, + "virtio_blk: secure_erase_sector_alignment can't be 0\n"); + err = -EINVAL; + goto out_cleanup_disk; + } + + discard_granularity = min_not_zero(discard_granularity, v); + + virtio_cread(vdev, struct virtio_blk_config, + max_secure_erase_sectors, &v); + + /* max_secure_erase_sectors should not be zero, the device should set a + * valid number of sectors. + */ + if (!v) { + dev_err(&vdev->dev, + "virtio_blk: max_secure_erase_sectors can't be 0\n"); + err = -EINVAL; + goto out_cleanup_disk; + } + + blk_queue_max_secure_erase_sectors(q, v); + + virtio_cread(vdev, struct virtio_blk_config, + max_secure_erase_seg, &v); + + /* max_secure_erase_seg should not be zero, the device should set a + * valid number of segments + */ + if (!v) { + dev_err(&vdev->dev, + "virtio_blk: max_secure_erase_seg can't be 0\n"); + err = -EINVAL; + goto out_cleanup_disk; + } + + max_discard_segs = min_not_zero(max_discard_segs, v); + } + + if (virtio_has_feature(vdev, VIRTIO_BLK_F_DISCARD) || + virtio_has_feature(vdev, VIRTIO_BLK_F_SECURE_ERASE)) { + /* max_discard_seg and discard_granularity will be 0 only + * if max_discard_seg and discard_sector_alignment fields in the virtio + * config are 0 and VIRTIO_BLK_F_SECURE_ERASE feature is not negotiated. + * In this case, we use default values. + */ + if (!max_discard_segs) + max_discard_segs = sg_elems; + + blk_queue_max_discard_segments(q, + min(max_discard_segs, MAX_DISCARD_SEGMENTS)); + + if (discard_granularity) + q->limits.discard_granularity = discard_granularity << SECTOR_SHIFT; + else + q->limits.discard_granularity = blk_size; + } + virtblk_update_capacity(vblk, false); virtio_device_ready(vdev); @@ -949,7 +1154,7 @@ static int virtblk_probe(struct virtio_device *vdev) return 0; out_cleanup_disk: - blk_cleanup_disk(vblk->disk); + put_disk(vblk->disk); out_free_tags: blk_mq_free_tag_set(&vblk->tag_set); out_free_vq: @@ -971,13 +1176,12 @@ static void virtblk_remove(struct virtio_device *vdev) flush_work(&vblk->config_work); del_gendisk(vblk->disk); - blk_cleanup_disk(vblk->disk); blk_mq_free_tag_set(&vblk->tag_set); mutex_lock(&vblk->vdev_mutex); /* Stop all the virtqueues. */ - vdev->config->reset(vdev); + virtio_reset_device(vdev); /* Virtqueues are stopped, nothing can use vblk->vdev anymore. */ vblk->vdev = NULL; @@ -987,7 +1191,7 @@ static void virtblk_remove(struct virtio_device *vdev) mutex_unlock(&vblk->vdev_mutex); - virtblk_put(vblk); + put_disk(vblk->disk); } #ifdef CONFIG_PM_SLEEP @@ -996,7 +1200,7 @@ static int virtblk_freeze(struct virtio_device *vdev) struct virtio_blk *vblk = vdev->priv; /* Ensure we don't receive any more interrupts */ - vdev->config->reset(vdev); + virtio_reset_device(vdev); /* Make sure no work handler is accessing the device. */ flush_work(&vblk->config_work); @@ -1035,6 +1239,7 @@ static unsigned int features_legacy[] = { VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE, VIRTIO_BLK_F_FLUSH, VIRTIO_BLK_F_TOPOLOGY, VIRTIO_BLK_F_CONFIG_WCE, VIRTIO_BLK_F_MQ, VIRTIO_BLK_F_DISCARD, VIRTIO_BLK_F_WRITE_ZEROES, + VIRTIO_BLK_F_SECURE_ERASE, } ; static unsigned int features[] = { @@ -1042,6 +1247,7 @@ static unsigned int features[] = { VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE, VIRTIO_BLK_F_FLUSH, VIRTIO_BLK_F_TOPOLOGY, VIRTIO_BLK_F_CONFIG_WCE, VIRTIO_BLK_F_MQ, VIRTIO_BLK_F_DISCARD, VIRTIO_BLK_F_WRITE_ZEROES, + VIRTIO_BLK_F_SECURE_ERASE, }; static struct virtio_driver virtio_blk = { @@ -1061,7 +1267,7 @@ static struct virtio_driver virtio_blk = { #endif }; -static int __init init(void) +static int __init virtio_blk_init(void) { int error; @@ -1087,14 +1293,14 @@ out_destroy_workqueue: return error; } -static void __exit fini(void) +static void __exit virtio_blk_fini(void) { unregister_virtio_driver(&virtio_blk); unregister_blkdev(major, "virtblk"); destroy_workqueue(virtblk_wq); } -module_init(init); -module_exit(fini); +module_init(virtio_blk_init); +module_exit(virtio_blk_fini); MODULE_DEVICE_TABLE(virtio, id_table); MODULE_DESCRIPTION("Virtio block driver"); |