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authorTejun Heo <tj@kernel.org>2014-09-08 08:03:56 +0900
committerJens Axboe <axboe@fb.com>2014-09-08 10:00:35 -0600
commitff9ea323816dc1c8ac7144afd4eab3ac97704430 (patch)
treea865fe69407f8c15d4d877defbc801aebf8d1849 /fs/block_dev.c
parentf4da80727cfbc3590d95ff17ef8db96e6f1483a4 (diff)
downloadop-kernel-dev-ff9ea323816dc1c8ac7144afd4eab3ac97704430.zip
op-kernel-dev-ff9ea323816dc1c8ac7144afd4eab3ac97704430.tar.gz
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>
Diffstat (limited to 'fs/block_dev.c')
-rw-r--r--fs/block_dev.c2
1 files changed, 0 insertions, 2 deletions
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 6d72746..d3251ec 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1173,8 +1173,6 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
if (!ret) {
bd_set_size(bdev,(loff_t)get_capacity(disk)<<9);
bdi = blk_get_backing_dev_info(bdev);
- if (bdi == NULL)
- bdi = &default_backing_dev_info;
bdev_inode_switch_bdi(bdev->bd_inode, bdi);
}
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