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dm-mpath, scsi_dh: request scsi_dh modules in scsi_dh, not dm-mpath 

This way we can reused the same code any attachment method, not just those
requested from dm-mpath.

[jejb: fixup checkpatch error]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Acked-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: James Bottomley <JBottomley@Odin.com>
This commit is contained in:
Christoph Hellwig 2015-08-27 14:16:55 +02:00 committed by James Bottomley
parent 1bab0de027
commit 566079c849
3 changed files with 19 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/md/dm-mpath.c
View File

@ -725,12 +725,6 @@ static int parse_hw_handler(struct dm_arg_set *as, struct multipath *m)
return 0;
m->hw_handler_name = kstrdup(dm_shift_arg(as), GFP_KERNEL);
if (!try_then_request_module(scsi_dh_handler_exist(m->hw_handler_name),
"scsi_dh_%s", m->hw_handler_name)) {
ti->error = "unknown hardware handler type";
ret = -EINVAL;
goto fail;
}
if (hw_argc > 1) {
char *p;

36
drivers/scsi/device_handler/scsi_dh.c
View File

@ -29,7 +29,7 @@
static DEFINE_SPINLOCK(list_lock);
static LIST_HEAD(scsi_dh_list);
static struct scsi_device_handler *get_device_handler(const char *name)
static struct scsi_device_handler *__scsi_dh_lookup(const char *name)
{
struct scsi_device_handler *tmp, *found = NULL;
@ -44,6 +44,19 @@ static struct scsi_device_handler *get_device_handler(const char *name)
return found;
}
static struct scsi_device_handler *scsi_dh_lookup(const char *name)
{
struct scsi_device_handler *dh;
dh = __scsi_dh_lookup(name);
if (!dh) {
request_module(name);
dh = __scsi_dh_lookup(name);
}
return dh;
}
/*
* device_handler_match_function - Match a device handler to a device
* @sdev - SCSI device to be tested
@ -158,7 +171,8 @@ store_dh_state(struct device *dev, struct device_attribute *attr,
/*
* Attach to a device handler
*/
if (!(scsi_dh = get_device_handler(buf)))
scsi_dh = scsi_dh_lookup(buf);
if (!scsi_dh)
return err;
err = scsi_dh_handler_attach(sdev, scsi_dh);
} else {
@ -322,8 +336,7 @@ static int scsi_dh_notifier_remove(struct device *dev, void *data)
*/
int scsi_register_device_handler(struct scsi_device_handler *scsi_dh)
{
if (get_device_handler(scsi_dh->name))
if (__scsi_dh_lookup(scsi_dh->name))
return -EBUSY;
if (!scsi_dh->attach || !scsi_dh->detach)
@ -350,7 +363,7 @@ EXPORT_SYMBOL_GPL(scsi_register_device_handler);
int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh)
{
if (!get_device_handler(scsi_dh->name))
if (!__scsi_dh_lookup(scsi_dh->name))
return -ENODEV;
bus_for_each_dev(&scsi_bus_type, NULL, scsi_dh,
@ -454,17 +467,6 @@ int scsi_dh_set_params(struct request_queue *q, const char *params)
}
EXPORT_SYMBOL_GPL(scsi_dh_set_params);
/*
* scsi_dh_handler_exist - Return TRUE(1) if a device handler exists for
* the given name. FALSE(0) otherwise.
* @name - name of the device handler.
*/
int scsi_dh_handler_exist(const char *name)
{
return (get_device_handler(name) != NULL);
}
EXPORT_SYMBOL_GPL(scsi_dh_handler_exist);
/*
* scsi_dh_attach - Attach device handler
* @q - Request queue that is associated with the scsi_device
@ -478,7 +480,7 @@ int scsi_dh_attach(struct request_queue *q, const char *name)
struct scsi_device_handler *scsi_dh;
int err = 0;
scsi_dh = get_device_handler(name);
scsi_dh = scsi_dh_lookup(name);
if (!scsi_dh)
return -EINVAL;

5
include/scsi/scsi_dh.h
View File

@ -57,7 +57,6 @@ enum {
};
#if defined(CONFIG_SCSI_DH) || defined(CONFIG_SCSI_DH_MODULE)
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 const char *scsi_dh_attached_handler_name(struct request_queue *, gfp_t);
extern int scsi_dh_set_params(struct request_queue *, const char *);
@ -68,10 +67,6 @@ static inline int scsi_dh_activate(struct request_queue *req,
fn(data, 0);
return 0;
}
static inline int scsi_dh_handler_exist(const char *name)
{
return 0;
}
static inline int scsi_dh_attach(struct request_queue *req, const char *name)
{
return SCSI_DH_NOSYS;