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[SCSI] scsi_dh: add scsi_dh_attached_handler_name

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Introduce scsi_dh_attached_handler_name() to retrieve the name of the
scsi_dh that is attached to the scsi_device associated with the provided
request queue.  Returns NULL if a scsi_dh is not attached.

Also, fix scsi_dh_{attach,detach} function header comments to document
@q rather than @sdev.

Signed-off-by: Mike Snitzer <[email protected]>
Tested-by: Babu Moger <[email protected]>
Reviewed-by: Chandra Seetharaman <[email protected]>
Acked-by: Hannes Reinecke <[email protected]>
Signed-off-by: James Bottomley <[email protected]>
This commit is contained in:
Mike Snitzer 2012-06-26 14:32:03 -04:00 • committed by James Bottomley
commit 7e8a74b177
2 changed files with 42 additions and 2 deletions
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6
include/scsi/scsi_dh.h
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@ -60,6 +60,7 @@ extern int scsi_dh_activate(struct request_queue *, activate_complete, void *);
extern int scsi_dh_handler_exist(const char *);
extern int scsi_dh_attach(struct request_queue *, const char *);
extern void scsi_dh_detach(struct request_queue *);
extern const char *scsi_dh_attached_handler_name(struct request_queue *, gfp_t);
extern int scsi_dh_set_params(struct request_queue *, const char *);
#else
static inline int scsi_dh_activate(struct request_queue *req,
@ -80,6 +81,11 @@ static inline void scsi_dh_detach(struct request_queue *q)
{
return;
}
static inline const char *scsi_dh_attached_handler_name(struct request_queue *q,
gfp_t gfp)
{
return NULL;
}
static inline int scsi_dh_set_params(struct request_queue *req, const char *params)
{
return -SCSI_DH_NOSYS;