[PATCH 14/26] md: convert to blk_alloc_disk/blk_cleanup_disk

Christoph Hellwig
2021-05-21T05:52:35Z

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

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
drivers/md/md.c | 25 +++++++++----------------
1 file changed, 9 insertions(+), 16 deletions(-)

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 49f897fbb89b..d806be8cc210 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -5598,12 +5598,10 @@ static void md_free(struct kobject *ko)
if (mddev->sysfs_level)
sysfs_put(mddev->sysfs_level);

- if (mddev->gendisk)
+ if (mddev->gendisk) {
del_gendisk(mddev->gendisk);
- if (mddev->queue)
- blk_cleanup_queue(mddev->queue);
- if (mddev->gendisk)
- put_disk(mddev->gendisk);
+ blk_cleanup_disk(mddev->gendisk);
+ }
percpu_ref_exit(&mddev->writes_pending);

bioset_exit(&mddev->bio_set);
@@ -5711,20 +5709,13 @@ static int md_alloc(dev_t dev, char *name)
goto abort;

error = -ENOMEM;
- mddev->queue = blk_alloc_queue(NUMA_NO_NODE);
- if (!mddev->queue)
+ disk = blk_alloc_disk(NUMA_NO_NODE);
+ if (!disk)
goto abort;

- blk_set_stacking_limits(&mddev->queue->limits);
-
- disk = alloc_disk(1 << shift);
- if (!disk) {
- blk_cleanup_queue(mddev->queue);
- mddev->queue = NULL;
- goto abort;
- }
disk->major = MAJOR(mddev->unit);
disk->first_minor = unit << shift;
+ disk->minors = 1 << shift;
if (name)
strcpy(disk->disk_name, name);
else if (partitioned)
@@ -5733,7 +5724,9 @@ static int md_alloc(dev_t dev, char *name)
sprintf(disk->disk_name, "md%d", unit);
disk->fops = &md_fops;
disk->private_data = mddev;
- disk->queue = mddev->queue;
+
+ mddev->queue = disk->queue;
+ blk_set_stacking_limits(&mddev->queue->limits);
blk_queue_write_cache(mddev->queue, true, true);
/* Allow extended partitions. This makes the
* 'mdp' device redundant, but we can't really
--
2.30.2