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dm-mpath, scsi_dh: don't let dm detach device handlers

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While allowing dm-mpath to attach device handlers is a functionality we need
for backwards compatibility reason there is no reason to reference count
them and detach them if dm-mpath stops using the device for some reason.

If the device handler works for the given device it can just stay attached,
and we can take the retain_hw_handler codepath.

Signed-off-by: Christoph Hellwig <[email protected]>
Acked-by: Mike Snitzer <[email protected]>
Acked-by: Hannes Reinecke <[email protected]>
Signed-off-by: James Bottomley <[email protected]>
This commit is contained in:
Christoph Hellwig 2015-08-27 14:16:54 +02:00 • committed by James Bottomley
commit 1bab0de027
4 changed files with 28 additions and 95 deletions
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1
include/scsi/scsi_device.h
View file

@ -221,7 +221,6 @@ struct scsi_device_handler {
struct scsi_dh_data {
struct scsi_device_handler *scsi_dh;
struct scsi_device *sdev;
struct kref kref;
};
#define to_scsi_device(d) \

5
include/scsi/scsi_dh.h
View file

@ -59,7 +59,6 @@ enum {
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
@ -77,10 +76,6 @@ static inline int scsi_dh_attach(struct request_queue *req, const char *name)
{
return SCSI_DH_NOSYS;
}
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)
{