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Linux 2.6.27 compat, blk_queue_stackable()

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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.
This commit is contained in:
Brian Behlendorf 2011-03-22 09:26:38 -07:00
parent 1073d746d6
commit 3517f0b7e9
1 changed files with 11 additions and 0 deletions
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11
include/linux/blkdev_compat.h
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@ -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)