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block: refactor blk_drop_partitions

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Move the busy check and disk-wide sync into the only caller, so that
the remainder can be shared with del_gendisk.  Also pass the gendisk
instead of the bdev as that is all that is needed.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20210406062303.811835-5-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2021-04-06 08:22:55 +02:00 committed by Jens Axboe
parent 473338be3a
commit d3c4a43d92
5 changed files with 10 additions and 26 deletions
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1
block/blk.h
View file

@ -349,7 +349,6 @@ char *disk_name(struct gendisk *hd, int partno, char *buf);
#define ADDPART_FLAG_NONE 0
#define ADDPART_FLAG_RAID 1
#define ADDPART_FLAG_WHOLEDISK 2
void delete_partition(struct block_device *part);
int bdev_add_partition(struct block_device *bdev, int partno,
sector_t start, sector_t length);
int bdev_del_partition(struct block_device *bdev, int partno);

11
block/genhd.c
View file

@ -667,9 +667,6 @@ EXPORT_SYMBOL(device_add_disk_no_queue_reg);
*/
void del_gendisk(struct gendisk *disk)
{
struct disk_part_iter piter;
struct block_device *part;
might_sleep();
if (WARN_ON_ONCE(!disk->queue))
@ -683,13 +680,7 @@ void del_gendisk(struct gendisk *disk)
* disk is marked as dead (GENHD_FL_UP cleared).
*/
down_write(&bdev_lookup_sem);
/* invalidate stuff */
disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY);
while ((part = disk_part_iter_next(&piter)))
delete_partition(part);
disk_part_iter_exit(&piter);
blk_drop_partitions(disk);
fsync_bdev(disk->part0);
__invalidate_device(disk->part0, true);

14
block/partitions/core.c
View file

@ -285,7 +285,7 @@ struct device_type part_type = {
* Must be called either with bd_mutex held, before a disk can be opened or
* after all disk users are gone.
*/
void delete_partition(struct block_device *part)
static void delete_partition(struct block_device *part)
{
fsync_bdev(part);
__invalidate_device(part, true);
@ -526,23 +526,15 @@ static bool disk_unlock_native_capacity(struct gendisk *disk)
}
}
int blk_drop_partitions(struct block_device *bdev)
void blk_drop_partitions(struct gendisk *disk)
{
struct disk_part_iter piter;
struct block_device *part;
if (bdev->bd_part_count)
return -EBUSY;
sync_blockdev(bdev);
invalidate_bdev(bdev);
disk_part_iter_init(&piter, bdev->bd_disk, DISK_PITER_INCL_EMPTY);
disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY);
while ((part = disk_part_iter_next(&piter)))
delete_partition(part);
disk_part_iter_exit(&piter);
return 0;
}
static bool blk_add_partition(struct gendisk *disk, struct block_device *bdev,

8
fs/block_dev.c
View file

@ -1243,9 +1243,11 @@ int bdev_disk_changed(struct block_device *bdev, bool invalidate)
clear_bit(GD_NEED_PART_SCAN, &bdev->bd_disk->state);
rescan:
ret = blk_drop_partitions(bdev);
if (ret)
return ret;
if (bdev->bd_part_count)
return -EBUSY;
sync_blockdev(bdev);
invalidate_bdev(bdev);
blk_drop_partitions(disk);
/*
* Historically we only set the capacity to zero for devices that

2
include/linux/genhd.h
View file

@ -273,7 +273,7 @@ static inline sector_t get_capacity(struct gendisk *disk)
int bdev_disk_changed(struct block_device *bdev, bool invalidate);
int blk_add_partitions(struct gendisk *disk, struct block_device *bdev);
int blk_drop_partitions(struct block_device *bdev);
void blk_drop_partitions(struct gendisk *disk);
extern struct gendisk *__alloc_disk_node(int minors, int node_id);
extern void put_disk(struct gendisk *disk);