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genhd: Add helper put_disk_and_module() 

Add a proper counterpart to get_disk_and_module() -
put_disk_and_module(). Currently it is opencoded in several places.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jan Kara 2018-02-26 13:01:39 +01:00 committed by Jens Axboe
parent 3079c22ea8
commit 9df6c29912
4 changed files with 24 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
block/blk-cgroup.c
View File

@ -812,7 +812,6 @@ int blkg_conf_prep(struct blkcg *blkcg, const struct blkcg_policy *pol,
struct gendisk *disk;
struct request_queue *q;
struct blkcg_gq *blkg;
struct module *owner;
unsigned int major, minor;
int key_len, part, ret;
char *body;
@ -904,9 +903,7 @@ fail_unlock:
spin_unlock_irq(q->queue_lock);
rcu_read_unlock();
fail:
owner = disk->fops->owner;
put_disk(disk);
module_put(owner);
put_disk_and_module(disk);
/*
* If queue was bypassing, we should retry. Do so after a
* short msleep(). It isn't strictly necessary but queue
@ -931,13 +928,9 @@ EXPORT_SYMBOL_GPL(blkg_conf_prep);
void blkg_conf_finish(struct blkg_conf_ctx *ctx)
__releases(ctx->disk->queue->queue_lock) __releases(rcu)
{
struct module *owner;
spin_unlock_irq(ctx->disk->queue->queue_lock);
rcu_read_unlock();
owner = ctx->disk->fops->owner;
put_disk(ctx->disk);
module_put(owner);
put_disk_and_module(ctx->disk);
}
EXPORT_SYMBOL_GPL(blkg_conf_finish);

20
block/genhd.c
View File

@ -817,10 +817,7 @@ struct gendisk *get_gendisk(dev_t devt, int *partno)
}
if (disk && unlikely(disk->flags & GENHD_FL_HIDDEN)) {
struct module *owner = disk->fops->owner;
put_disk(disk);
module_put(owner);
put_disk_and_module(disk);
disk = NULL;
}
return disk;
@ -1483,6 +1480,21 @@ void put_disk(struct gendisk *disk)
}
EXPORT_SYMBOL(put_disk);
/*
* This is a counterpart of get_disk_and_module() and thus also of
* get_gendisk().
*/
void put_disk_and_module(struct gendisk *disk)
{
if (disk) {
struct module *owner = disk->fops->owner;
put_disk(disk);
module_put(owner);
}
}
EXPORT_SYMBOL(put_disk_and_module);
static void set_disk_ro_uevent(struct gendisk *gd, int ro)
{
char event[] = "DISK_RO=1";

19
fs/block_dev.c
View File

@ -1111,8 +1111,7 @@ static struct block_device *bd_start_claiming(struct block_device *bdev,
else
whole = bdgrab(bdev);
module_put(disk->fops->owner);
put_disk(disk);
put_disk_and_module(disk);
if (!whole)
return ERR_PTR(-ENOMEM);
@ -1407,7 +1406,6 @@ static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part);
static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
{
struct gendisk *disk;
struct module *owner;
int ret;
int partno;
int perm = 0;
@ -1433,7 +1431,6 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
disk = get_gendisk(bdev->bd_dev, &partno);
if (!disk)
goto out;
owner = disk->fops->owner;
disk_block_events(disk);
mutex_lock_nested(&bdev->bd_mutex, for_part);
@ -1463,8 +1460,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
bdev->bd_queue = NULL;
mutex_unlock(&bdev->bd_mutex);
disk_unblock_events(disk);
put_disk(disk);
module_put(owner);
put_disk_and_module(disk);
goto restart;
}
}
@ -1525,8 +1521,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
goto out_unlock_bdev;
}
/* only one opener holds refs to the module and disk */
put_disk(disk);
module_put(owner);
put_disk_and_module(disk);
}
bdev->bd_openers++;
if (for_part)
@ -1546,8 +1541,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
out_unlock_bdev:
mutex_unlock(&bdev->bd_mutex);
disk_unblock_events(disk);
put_disk(disk);
module_put(owner);
put_disk_and_module(disk);
out:
bdput(bdev);
@ -1770,8 +1764,6 @@ static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part)
disk->fops->release(disk, mode);
}
if (!bdev->bd_openers) {
struct module *owner = disk->fops->owner;
disk_put_part(bdev->bd_part);
bdev->bd_part = NULL;
bdev->bd_disk = NULL;
@ -1779,8 +1771,7 @@ static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part)
victim = bdev->bd_contains;
bdev->bd_contains = NULL;
put_disk(disk);
module_put(owner);
put_disk_and_module(disk);
}
mutex_unlock(&bdev->bd_mutex);
bdput(bdev);

1
include/linux/genhd.h
View File

@ -602,6 +602,7 @@ extern void printk_all_partitions(void);
extern struct gendisk *__alloc_disk_node(int minors, int node_id);
extern struct kobject *get_disk_and_module(struct gendisk *disk);
extern void put_disk(struct gendisk *disk);
extern void put_disk_and_module(struct gendisk *disk);
extern void blk_register_region(dev_t devt, unsigned long range,
struct module *module,
struct kobject *(*probe)(dev_t, int *, void *),