[PATCH 07/26] drbd: convert to blk_alloc_disk/blk_cleanup_disk

[Christoph Hellwig]

Convert the drbd driver to use the blk_alloc_disk and blk_cleanup_disk
helpers to simplify gendisk and request_queue allocation.

Signed-off-by: Christoph Hellwig <h...@lst.de>
---
 drivers/block/drbd/drbd_main.c | 23 ++++++++---------------
 1 file changed, 8 insertions(+), 15 deletions(-)

diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index de463773b530..55234a558e98 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -2231,8 +2231,7 @@ void drbd_destroy_device(struct kref *kref)
        if (device->bitmap) /* should no longer be there. */
                drbd_bm_cleanup(device);
        __free_page(device->md_io.page);
-       put_disk(device->vdisk);
-       blk_cleanup_queue(device->rq_queue);
+       blk_cleanup_disk(device->vdisk);
        kfree(device->rs_plan_s);
 
        /* not for_each_connection(connection, resource):
@@ -2701,7 +2700,6 @@ enum drbd_ret_code drbd_create_device(struct 
drbd_config_context *adm_ctx, unsig
        struct drbd_device *device;
        struct drbd_peer_device *peer_device, *tmp_peer_device;
        struct gendisk *disk;
-       struct request_queue *q;
        int id;
        int vnr = adm_ctx->volume;
        enum drbd_ret_code err = ERR_NOMEM;
@@ -2723,29 +2721,26 @@ enum drbd_ret_code drbd_create_device(struct 
drbd_config_context *adm_ctx, unsig
 
        drbd_init_set_defaults(device);
 
-       q = blk_alloc_queue(NUMA_NO_NODE);
-       if (!q)
-               goto out_no_q;
-       device->rq_queue = q;
-
-       disk = alloc_disk(1);
+       disk = blk_alloc_disk(NUMA_NO_NODE);
        if (!disk)
                goto out_no_disk;
+
        device->vdisk = disk;
+       device->rq_queue = disk->queue;
 
        set_disk_ro(disk, true);
 
-       disk->queue = q;
        disk->major = DRBD_MAJOR;
        disk->first_minor = minor;
+       disk->minors = 1;
        disk->fops = &drbd_ops;
        sprintf(disk->disk_name, "drbd%d", minor);
        disk->private_data = device;
 
-       blk_queue_write_cache(q, true, true);
+       blk_queue_write_cache(disk->queue, true, true);
        /* Setting the max_hw_sectors to an odd value of 8kibyte here
           This triggers a max_bio_size message upon first attach or connect */
-       blk_queue_max_hw_sectors(q, DRBD_MAX_BIO_SIZE_SAFE >> 8);
+       blk_queue_max_hw_sectors(disk->queue, DRBD_MAX_BIO_SIZE_SAFE >> 8);
 
        device->md_io.page = alloc_page(GFP_KERNEL);
        if (!device->md_io.page)
@@ -2834,10 +2829,8 @@ enum drbd_ret_code drbd_create_device(struct 
drbd_config_context *adm_ctx, unsig
 out_no_bitmap:
        __free_page(device->md_io.page);
 out_no_io_page:
-       put_disk(disk);
+       blk_cleanup_disk(disk);
 out_no_disk:
-       blk_cleanup_queue(q);
-out_no_q:
        kref_put(&resource->kref, drbd_destroy_resource);
        kfree(device);
        return err;
-- 
2.30.2