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 <[email protected]> Acked-by: Tejun Heo <[email protected]> Reviewed-by: Jan Kara <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
tadfisher · Dec 1, 2020 · 7918f0f · 7918f0f
1 parent 63d9932
commit 7918f0f
Showing 1 changed file with 4 additions and 6 deletions.
diff --git a/fs/block_dev.c b/fs/block_dev.c
@@ -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;