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loop: Factor out setting loop device size 

This code is used repeatedly.

Signed-off-by: Martijn Coenen <maco@android.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Martijn Coenen 2020-05-13 15:38:37 +02:00 committed by Jens Axboe
parent 083a6a5078
commit 5795b6f560
1 changed files with 21 additions and 9 deletions
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30
drivers/block/loop.c
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@ -228,20 +228,35 @@ static void __loop_update_dio(struct loop_device *lo, bool dio)
blk_mq_unfreeze_queue(lo->lo_queue);
}
/**
* loop_set_size() - sets device size and notifies userspace
* @lo: struct loop_device to set the size for
* @size: new size of the loop device
*
* Callers must validate that the size passed into this function fits into
* a sector_t, eg using loop_validate_size()
*/
static void loop_set_size(struct loop_device *lo, loff_t size)
{
struct block_device *bdev = lo->lo_device;
set_capacity(lo->lo_disk, size);
bd_set_size(bdev, size << SECTOR_SHIFT);
/* let user-space know about the new size */
kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, KOBJ_CHANGE);
}
static void
figure_loop_size(struct loop_device *lo, loff_t offset, loff_t sizelimit)
{
loff_t size = get_size(offset, sizelimit, lo->lo_backing_file);
struct block_device *bdev = lo->lo_device;
if (lo->lo_offset != offset)
lo->lo_offset = offset;
if (lo->lo_sizelimit != sizelimit)
lo->lo_sizelimit = sizelimit;
set_capacity(lo->lo_disk, size);
bd_set_size(bdev, (loff_t)get_capacity(bdev->bd_disk) << 9);
/* let user-space know about the new size */
kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, KOBJ_CHANGE);
loop_set_size(lo, size);
}
static inline int
@ -1034,11 +1049,8 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode,
loop_update_rotational(lo);
loop_update_dio(lo);
set_capacity(lo->lo_disk, size);
bd_set_size(bdev, size << 9);
loop_sysfs_init(lo);
/* let user-space know about the new size */
kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, KOBJ_CHANGE);
loop_set_size(lo, size);
set_blocksize(bdev, S_ISBLK(inode->i_mode) ?
block_size(inode->i_bdev) : PAGE_SIZE);