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brd: convert to blk_alloc_disk/blk_cleanup_disk

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Convert the brd driver to use the blk_alloc_disk and blk_cleanup_disk
helpers to simplify gendisk and request_queue allocation.  This also
allows to remove the request_queue pointer in struct request_queue,
and to simplify the initialization as blk_cleanup_disk can be called
on any disk returned from blk_alloc_disk.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Link: https://lore.kernel.org/r/20210521055116.1053587-7-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2021-05-21 07:50:56 +02:00 committed by Jens Axboe
parent f525464a80
commit 7f9b348cb5
1 changed files with 33 additions and 61 deletions
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94
drivers/block/brd.c
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@ -38,9 +38,7 @@
* device).
*/
struct brd_device {
int brd_number;
struct request_queue *brd_queue;
int brd_number;
struct gendisk *brd_disk;
struct list_head brd_list;
@ -372,7 +370,7 @@ static LIST_HEAD(brd_devices);
static DEFINE_MUTEX(brd_devices_mutex);
static struct dentry *brd_debugfs_dir;
static struct brd_device *brd_alloc(int i)
static int brd_alloc(int i)
{
struct brd_device *brd;
struct gendisk *disk;
@ -380,64 +378,55 @@ static struct brd_device *brd_alloc(int i)
brd = kzalloc(sizeof(*brd), GFP_KERNEL);
if (!brd)
goto out;
return -ENOMEM;
brd->brd_number = i;
spin_lock_init(&brd->brd_lock);
INIT_RADIX_TREE(&brd->brd_pages, GFP_ATOMIC);
brd->brd_queue = blk_alloc_queue(NUMA_NO_NODE);
if (!brd->brd_queue)
goto out_free_dev;
snprintf(buf, DISK_NAME_LEN, "ram%d", i);
if (!IS_ERR_OR_NULL(brd_debugfs_dir))
debugfs_create_u64(buf, 0444, brd_debugfs_dir,
&brd->brd_nr_pages);
/* This is so fdisk will align partitions on 4k, because of
* direct_access API needing 4k alignment, returning a PFN
* (This is only a problem on very small devices <= 4M,
* otherwise fdisk will align on 1M. Regardless this call
* is harmless)
*/
blk_queue_physical_block_size(brd->brd_queue, PAGE_SIZE);
disk = brd->brd_disk = alloc_disk(max_part);
disk = brd->brd_disk = blk_alloc_disk(NUMA_NO_NODE);
if (!disk)
goto out_free_queue;
goto out_free_dev;
disk->major = RAMDISK_MAJOR;
disk->first_minor = i * max_part;
disk->minors = max_part;
disk->fops = &brd_fops;
disk->private_data = brd;
disk->flags = GENHD_FL_EXT_DEVT;
strlcpy(disk->disk_name, buf, DISK_NAME_LEN);
set_capacity(disk, rd_size * 2);
/*
* This is so fdisk will align partitions on 4k, because of
* direct_access API needing 4k alignment, returning a PFN
* (This is only a problem on very small devices <= 4M,
* otherwise fdisk will align on 1M. Regardless this call
* is harmless)
*/
blk_queue_physical_block_size(disk->queue, PAGE_SIZE);
/* Tell the block layer that this is not a rotational device */
blk_queue_flag_set(QUEUE_FLAG_NONROT, brd->brd_queue);
blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, brd->brd_queue);
blk_queue_flag_set(QUEUE_FLAG_NONROT, disk->queue);
blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, disk->queue);
add_disk(disk);
list_add_tail(&brd->brd_list, &brd_devices);
return brd;
return 0;
out_free_queue:
blk_cleanup_queue(brd->brd_queue);
out_free_dev:
kfree(brd);
out:
return NULL;
}
static void brd_free(struct brd_device *brd)
{
put_disk(brd->brd_disk);
blk_cleanup_queue(brd->brd_queue);
brd_free_pages(brd);
kfree(brd);
return -ENOMEM;
}
static void brd_probe(dev_t dev)
{
struct brd_device *brd;
int i = MINOR(dev) / max_part;
struct brd_device *brd;
mutex_lock(&brd_devices_mutex);
list_for_each_entry(brd, &brd_devices, brd_list) {
@ -445,13 +434,7 @@ static void brd_probe(dev_t dev)
goto out_unlock;
}
brd = brd_alloc(i);
if (brd) {
brd->brd_disk->queue = brd->brd_queue;
add_disk(brd->brd_disk);
list_add_tail(&brd->brd_list, &brd_devices);
}
brd_alloc(i);
out_unlock:
mutex_unlock(&brd_devices_mutex);
}
@ -460,7 +443,9 @@ static void brd_del_one(struct brd_device *brd)
{
list_del(&brd->brd_list);
del_gendisk(brd->brd_disk);
brd_free(brd);
blk_cleanup_disk(brd->brd_disk);
brd_free_pages(brd);
kfree(brd);
}
static inline void brd_check_and_reset_par(void)
@ -485,7 +470,7 @@ static inline void brd_check_and_reset_par(void)
static int __init brd_init(void)
{
struct brd_device *brd, *next;
int i;
int err, i;
/*
* brd module now has a feature to instantiate underlying device
@ -511,22 +496,11 @@ static int __init brd_init(void)
mutex_lock(&brd_devices_mutex);
for (i = 0; i < rd_nr; i++) {
brd = brd_alloc(i);
if (!brd)
err = brd_alloc(i);
if (err)
goto out_free;
list_add_tail(&brd->brd_list, &brd_devices);
}
/* point of no return */
list_for_each_entry(brd, &brd_devices, brd_list) {
/*
* associate with queue just before adding disk for
* avoiding to mess up failure path
*/
brd->brd_disk->queue = brd->brd_queue;
add_disk(brd->brd_disk);
}
mutex_unlock(&brd_devices_mutex);
pr_info("brd: module loaded\n");
@ -535,15 +509,13 @@ static int __init brd_init(void)
out_free:
debugfs_remove_recursive(brd_debugfs_dir);
list_for_each_entry_safe(brd, next, &brd_devices, brd_list) {
list_del(&brd->brd_list);
brd_free(brd);
}
list_for_each_entry_safe(brd, next, &brd_devices, brd_list)
brd_del_one(brd);
mutex_unlock(&brd_devices_mutex);
unregister_blkdev(RAMDISK_MAJOR, "ramdisk");
pr_info("brd: module NOT loaded !!!\n");
return -ENOMEM;
return err;
}
static void __exit brd_exit(void)