path: root/include/scsi
diff options
authorMike Snitzer <snitzer@redhat.com>2012-06-26 14:32:03 -0400
committerJames Bottomley <JBottomley@Parallels.com>2012-07-20 08:58:42 +0100
commit7e8a74b177f17d100916b6ad415450f7c9508691 (patch)
tree3a2ed38f030ef3e79d3c332c594dbad89d7642bf /include/scsi
parent6aca4112f67b67d0a2f60326a1331a4125564ca7 (diff)
[SCSI] scsi_dh: add scsi_dh_attached_handler_name
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 <snitzer@redhat.com> Tested-by: Babu Moger <babu.moger@netapp.com> Reviewed-by: Chandra Seetharaman <sekharan@us.ibm.com> Acked-by: Hannes Reinecke <hare@suse.de> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'include/scsi')
1 files changed, 6 insertions, 0 deletions
diff --git a/include/scsi/scsi_dh.h b/include/scsi/scsi_dh.h
index e3f2db212ddc..620c723ee8ed 100644
--- a/include/scsi/scsi_dh.h
+++ b/include/scsi/scsi_dh.h
@@ -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 *);
static inline int scsi_dh_activate(struct request_queue *req,
@@ -80,6 +81,11 @@ static inline void scsi_dh_detach(struct request_queue *q)
+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;