diff options
| author | Tejun Heo <tj@kernel.org> | 2014-09-08 08:03:56 +0900 |
|---|---|---|
| committer | Moyster <oysterized@gmail.com> | 2016-09-13 13:35:23 +0200 |
| commit | 68b47ca59d3cd76a825984b49c283cf5b39b220a (patch) | |
| tree | 133e40f26aeadd5ca0c541a7abceeb39a96cb7c6 /block/compat_ioctl.c | |
| parent | 2679d033a9192f766a82e75b2b3b4226a9e90484 (diff) | |
block, bdi: an active gendisk always has a request_queue associated with it
bdev_get_queue() returns the request_queue associated with the
specified block_device. blk_get_backing_dev_info() makes use of
bdev_get_queue() to determine the associated bdi given a block_device.
All the callers of bdev_get_queue() including
blk_get_backing_dev_info() assume that bdev_get_queue() may return
NULL and implement NULL handling; however, bdev_get_queue() requires
the passed in block_device is opened and attached to its gendisk.
Because an active gendisk always has a valid request_queue associated
with it, bdev_get_queue() can never return NULL and neither can
blk_get_backing_dev_info().
Make it clear that neither of the two functions can return NULL and
remove NULL handling from all the callers.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Chris Mason <clm@fb.com>
Cc: Dave Chinner <david@fromorbit.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
Diffstat (limited to 'block/compat_ioctl.c')
| -rw-r--r-- | block/compat_ioctl.c | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/block/compat_ioctl.c b/block/compat_ioctl.c index 21ad6869a..de805c2c5 100644 --- a/block/compat_ioctl.c +++ b/block/compat_ioctl.c @@ -707,8 +707,6 @@ long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg) if (!arg) return -EINVAL; bdi = blk_get_backing_dev_info(bdev); - if (bdi == NULL) - return -ENOTTY; return compat_put_long(arg, (bdi->ra_pages * PAGE_CACHE_SIZE) / 512); case BLKROGET: /* compatible */ @@ -728,8 +726,6 @@ long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg) if (!capable(CAP_SYS_ADMIN)) return -EACCES; bdi = blk_get_backing_dev_info(bdev); - if (bdi == NULL) - return -ENOTTY; bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE; return 0; case BLKGETSIZE: |