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authorGuo Chao <yan@linux.vnet.ibm.com>2013-02-21 15:16:47 -0800
committerJens Axboe <axboe@kernel.dk>2013-02-22 10:43:22 +0100
commit7b0576a3d835b4d46ed85d817ce016e90bf293a3 (patch)
tree9c9d9780f3ef794e8d20d2057a722bcab843fad5 /drivers/block/loop.c
parent541c742a7559eb65f0e36d3e2338c2ca532a3e61 (diff)
loopdev: move common code into loop_figure_size()
Update block device size in accord with gendisk size and let userspace know the change in loop_figure_size(). This is a clean up to remove common code of loop_figure_size()'s two callers. Signed-off-by: Guo Chao <yan@linux.vnet.ibm.com> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Guo Chao <yan@linux.vnet.ibm.com> Cc: M. Hindess <hindessm@uk.ibm.com> Cc: Nikanth Karthikesan <knikanth@suse.de> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/block/loop.c')
-rw-r--r--drivers/block/loop.c31
1 files changed, 7 insertions, 24 deletions
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index ed850366f22..6579f69fd7a 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -190,6 +190,7 @@ figure_loop_size(struct loop_device *lo, loff_t offset, loff_t sizelimit)
{
loff_t size = get_size(offset, sizelimit, lo->lo_backing_file);
sector_t x = (sector_t)size;
+ struct block_device *bdev = lo->lo_device;
if (unlikely((loff_t)x != size))
return -EFBIG;
@@ -198,6 +199,9 @@ figure_loop_size(struct loop_device *lo, loff_t offset, loff_t sizelimit)
if (lo->lo_sizelimit != sizelimit)
lo->lo_sizelimit = sizelimit;
set_capacity(lo->lo_disk, x);
+ 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);
return 0;
}
@@ -1091,15 +1095,10 @@ loop_set_status(struct loop_device *lo, const struct loop_info64 *info)
return err;
if (lo->lo_offset != info->lo_offset ||
- lo->lo_sizelimit != info->lo_sizelimit) {
- struct block_device *bdev = lo->lo_device;
-
+ lo->lo_sizelimit != info->lo_sizelimit)
if (figure_loop_size(lo, info->lo_offset, info->lo_sizelimit))
return -EFBIG;
- bd_set_size(bdev, (loff_t)get_capacity(bdev->bd_disk) << 9);
- kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, KOBJ_CHANGE);
- }
loop_config_discard(lo);
memcpy(lo->lo_file_name, info->lo_file_name, LO_NAME_SIZE);
@@ -1276,26 +1275,10 @@ loop_get_status64(struct loop_device *lo, struct loop_info64 __user *arg) {
static int loop_set_capacity(struct loop_device *lo, struct block_device *bdev)
{
- int err;
- sector_t sec;
- loff_t sz;
-
- err = -ENXIO;
if (unlikely(lo->lo_state != Lo_bound))
- goto out;
- err = figure_loop_size(lo, lo->lo_offset, lo->lo_sizelimit);
- if (unlikely(err))
- goto out;
- sec = get_capacity(lo->lo_disk);
- /* the width of sector_t may be narrow for bit-shift */
- sz = sec;
- sz <<= 9;
- bd_set_size(bdev, sz);
- /* let user-space know about the new size */
- kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, KOBJ_CHANGE);
+ return -ENXIO;
- out:
- return err;
+ return figure_loop_size(lo, lo->lo_offset, lo->lo_sizelimit);
}
static int lo_ioctl(struct block_device *bdev, fmode_t mode,