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block: remove disk_part_iter

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Just open code the xa_for_each in the remaining user.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20210406062303.811835-12-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2021-04-06 08:23:02 +02:00 committed by Jens Axboe
parent 7fae67cc9c
commit 3212135a71
2 changed files with 13 additions and 98 deletions
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92
block/genhd.c
View File

@ -161,81 +161,6 @@ static void part_in_flight_rw(struct block_device *part,
inflight[1] = 0;
}
/**
* disk_part_iter_init - initialize partition iterator
* @piter: iterator to initialize
* @disk: disk to iterate over
* @flags: DISK_PITER_* flags
*
* Initialize @piter so that it iterates over partitions of @disk.
*
* CONTEXT:
* Don't care.
*/
void disk_part_iter_init(struct disk_part_iter *piter, struct gendisk *disk,
unsigned int flags)
{
piter->disk = disk;
piter->part = NULL;
if (flags & (DISK_PITER_INCL_PART0 | DISK_PITER_INCL_EMPTY_PART0))
piter->idx = 0;
else
piter->idx = 1;
piter->flags = flags;
}
/**
* disk_part_iter_next - proceed iterator to the next partition and return it
* @piter: iterator of interest
*
* Proceed @piter to the next partition and return it.
*
* CONTEXT:
* Don't care.
*/
struct block_device *disk_part_iter_next(struct disk_part_iter *piter)
{
struct block_device *part;
unsigned long idx;
/* put the last partition */
disk_part_iter_exit(piter);
rcu_read_lock();
xa_for_each_start(&piter->disk->part_tbl, idx, part, piter->idx) {
if (!bdev_nr_sectors(part) &&
!(piter->flags & DISK_PITER_INCL_EMPTY) &&
!(piter->flags & DISK_PITER_INCL_EMPTY_PART0 &&
piter->idx == 0))
continue;
piter->part = bdgrab(part);
if (!piter->part)
continue;
piter->idx = idx + 1;
break;
}
rcu_read_unlock();
return piter->part;
}
/**
* disk_part_iter_exit - finish up partition iteration
* @piter: iter of interest
*
* Called when iteration is over. Cleans up @piter.
*
* CONTEXT:
* Don't care.
*/
void disk_part_iter_exit(struct disk_part_iter *piter)
{
if (piter->part)
bdput(piter->part);
piter->part = NULL;
}
/*
* Can be deleted altogether. Later.
*
@ -472,13 +397,22 @@ static char *bdevt_str(dev_t devt, char *buf)
void disk_uevent(struct gendisk *disk, enum kobject_action action)
{
struct disk_part_iter piter;
struct block_device *part;
unsigned long idx;
disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY_PART0);
while ((part = disk_part_iter_next(&piter)))
rcu_read_lock();
xa_for_each(&disk->part_tbl, idx, part) {
if (bdev_is_partition(part) && !bdev_nr_sectors(part))
continue;
if (!bdgrab(part))
continue;
rcu_read_unlock();
kobject_uevent(bdev_kobj(part), action);
disk_part_iter_exit(&piter);
bdput(part);
rcu_read_lock();
}
rcu_read_unlock();
}
EXPORT_SYMBOL_GPL(disk_uevent);

19
include/linux/genhd.h
View File

@ -204,25 +204,6 @@ static inline dev_t disk_devt(struct gendisk *disk)
void disk_uevent(struct gendisk *disk, enum kobject_action action);
/*
* Smarter partition iterator without context limits.
*/
#define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */
#define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */
#define DISK_PITER_INCL_EMPTY_PART0 (1 << 3) /* include empty partition 0 */
struct disk_part_iter {
struct gendisk *disk;
struct block_device *part;
unsigned long idx;
unsigned int flags;
};
extern void disk_part_iter_init(struct disk_part_iter *piter,
struct gendisk *disk, unsigned int flags);
struct block_device *disk_part_iter_next(struct disk_part_iter *piter);
extern void disk_part_iter_exit(struct disk_part_iter *piter);
/* block/genhd.c */
extern void device_add_disk(struct device *parent, struct gendisk *disk,
const struct attribute_group **groups);