Commit 5795b6f5 authored by Martijn Coenen's avatar Martijn Coenen Committed by Jens Axboe
Browse files

loop: Factor out setting loop device size 



This code is used repeatedly.

Signed-off-by: default avatarMartijn Coenen <maco@android.com>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 083a6a50

drivers/block/loop.c

+21 −9
Original line number Diff line number Diff line
@@ -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);