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block: opencode devcgroup_inode_permission 

Just call devcgroup_check_permission to avoid various superflous checks
and a double conversion of the access flags.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2020-11-23 13:44:44 +01:00 committed by Jens Axboe
parent 63d9932cae
commit 7918f0f6fd
1 changed files with 4 additions and 6 deletions
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10
fs/block_dev.c
View File

@ -1520,15 +1520,13 @@ static int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder)
struct block_device *claiming;
bool unblock_events = true;
struct gendisk *disk;
int perm = 0;
int partno;
int ret;
if (mode & FMODE_READ)
perm |= MAY_READ;
if (mode & FMODE_WRITE)
perm |= MAY_WRITE;
ret = devcgroup_inode_permission(bdev->bd_inode, perm);
ret = devcgroup_check_permission(DEVCG_DEV_BLOCK,
imajor(bdev->bd_inode), iminor(bdev->bd_inode),
((mode & FMODE_READ) ? DEVCG_ACC_READ : 0) |
((mode & FMODE_WRITE) ? DEVCG_ACC_WRITE : 0));
if (ret)
goto bdput;