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[SCSI] scsi_dh: Implement match callback function

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Some device handler types are not tied to the vendor/model
but rather to a specific capability. Eg ALUA is supported
if the 'TPGS' setting in the standard inquiry is set.
This patch implements a 'match' callback for device handler
which supersedes the original vendor/model lookup and
implements the callback for the ALUA handler.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Hannes Reinecke
2011-08-24 10:51:15 +02:00
committed by James Bottomley
parent 2a9ab40f74
commit 6c3633d08a
3 changed files with 52 additions and 25 deletions
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53
drivers/scsi/device_handler/scsi_dh.c
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@@ -59,6 +59,46 @@ static struct scsi_device_handler *get_device_handler_by_idx(int idx)
return found;
}
/*
* device_handler_match_function - Match a device handler to a device
* @sdev - SCSI device to be tested
*
* Tests @sdev against the match function of all registered device_handler.
* Returns the found device handler or NULL if not found.
*/
static struct scsi_device_handler *
device_handler_match_function(struct scsi_device *sdev)
{
struct scsi_device_handler *tmp_dh, *found_dh = NULL;
spin_lock(&list_lock);
list_for_each_entry(tmp_dh, &scsi_dh_list, list) {
if (tmp_dh->match && tmp_dh->match(sdev)) {
found_dh = tmp_dh;
break;
}
}
spin_unlock(&list_lock);
return found_dh;
}
/*
* device_handler_match_devlist - Match a device handler to a device
* @sdev - SCSI device to be tested
*
* Tests @sdev against all device_handler registered in the devlist.
* Returns the found device handler or NULL if not found.
*/
static struct scsi_device_handler *
device_handler_match_devlist(struct scsi_device *sdev)
{
int idx;
idx = scsi_get_device_flags_keyed(sdev, sdev->vendor, sdev->model,
SCSI_DEVINFO_DH);
return get_device_handler_by_idx(idx);
}
/*
* device_handler_match - Attach a device handler to a device
* @scsi_dh - The device handler to match against or NULL
@@ -72,12 +112,11 @@ static struct scsi_device_handler *
device_handler_match(struct scsi_device_handler *scsi_dh,
struct scsi_device *sdev)
{
struct scsi_device_handler *found_dh = NULL;
int idx;
struct scsi_device_handler *found_dh;
idx = scsi_get_device_flags_keyed(sdev, sdev->vendor, sdev->model,
SCSI_DEVINFO_DH);
found_dh = get_device_handler_by_idx(idx);
found_dh = device_handler_match_function(sdev);
if (!found_dh)
found_dh = device_handler_match_devlist(sdev);
if (scsi_dh && found_dh != scsi_dh)
found_dh = NULL;
@@ -327,7 +366,7 @@ int scsi_register_device_handler(struct scsi_device_handler *scsi_dh)
list_add(&scsi_dh->list, &scsi_dh_list);
spin_unlock(&list_lock);
for (i = 0; scsi_dh->devlist[i].vendor; i++) {
for (i = 0; scsi_dh->devlist && scsi_dh->devlist[i].vendor; i++) {
scsi_dev_info_list_add_keyed(0,
scsi_dh->devlist[i].vendor,
scsi_dh->devlist[i].model,
@@ -360,7 +399,7 @@ int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh)
bus_for_each_dev(&scsi_bus_type, NULL, scsi_dh,
scsi_dh_notifier_remove);
for (i = 0; scsi_dh->devlist[i].vendor; i++) {
for (i = 0; scsi_dh->devlist && scsi_dh->devlist[i].vendor; i++) {
scsi_dev_info_list_del_keyed(scsi_dh->devlist[i].vendor,
scsi_dh->devlist[i].model,
SCSI_DEVINFO_DH);