diff options
| author | Brian Behlendorf <[email protected]> | 2011-03-22 09:26:38 -0700 |
|---|---|---|
| committer | Brian Behlendorf <[email protected]> | 2011-03-22 12:15:54 -0700 |
| commit | 3517f0b7e928e1a8e7634828fb92d194ea35004d (patch) | |
| tree | 61a0804339678a89475d742215e54a4b258deedb /include | |
| parent | 1073d746d6421eb5faf8a3cf8534d82a2beb0512 (diff) | |
Linux 2.6.27 compat, blk_queue_stackable()
The blk_queue_stackable() queue flag was added in 2.6.27 to handle dm
stacking drivers. Prior to this request stacking drivers were detected
by checking (q->request_fn == NULL), for earlier kernels we revert to
this legacy behavior.
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/blkdev_compat.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/blkdev_compat.h b/include/linux/blkdev_compat.h index d2e80ec88..3bf1f4574 100644 --- a/include/linux/blkdev_compat.h +++ b/include/linux/blkdev_compat.h @@ -172,6 +172,17 @@ __blk_rq_bytes(struct request *req) #define blk_fs_request(rq) ((rq)->cmd_type == REQ_TYPE_FS) #endif +/* + * 2.6.27 API change, + * The blk_queue_stackable() queue flag was added in 2.6.27 to handle dm + * stacking drivers. Prior to this request stacking drivers were detected + * by checking (q->request_fn == NULL), for earlier kernels we revert to + * this legacy behavior. + */ +#ifndef blk_queue_stackable +#define blk_queue_stackable(q) ((q)->request_fn == NULL) +#endif + #ifndef HAVE_GET_DISK_RO static inline int get_disk_ro(struct gendisk *disk) |