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[SCSI] dh_rdac: Associate HBA and storage in rdac_controller to support partitions in storage 

rdac hardware handler assumes that there is one-to-one relation ship
between the host and the controller w.r.t lun.  IOW, it does not
support "multiple storage partitions" within a storage.

Example:
HBA1 and HBA2 see lun 0 and 1 in storage A (1)
HBA3 and HBA4 see lun 0 and 1 in storage A (2)
HBA5 and HBA6 see lun 0 and 1 in storage A (3)

luns 0 and 1 in (1), (2) and (3) are totally different.

But, rdac handler treats the lun 0s (and lun 1s) as the same when
sending a mode select to the controller, which is wrong.

This patch makes the rdac hardware handler associate HBA and the
storage w.r.t lun (and not the host itself).

Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Chandra Seetharaman 2011-07-27 11:22:56 -07:00 committed by James Bottomley
parent f170c684b5
commit d685759539
1 changed files with 6 additions and 3 deletions
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9
drivers/scsi/device_handler/scsi_dh_rdac.c
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@ -158,6 +158,7 @@ struct rdac_controller {
} mode_select;
u8 index;
u8 array_name[ARRAY_LABEL_LEN];
struct Scsi_Host *host;
spinlock_t ms_lock;
int ms_queued;
struct work_struct ms_work;
@ -370,7 +371,7 @@ static void release_controller(struct kref *kref)
}
static struct rdac_controller *get_controller(int index, char *array_name,
u8 *array_id)
u8 *array_id, struct scsi_device *sdev)
{
struct rdac_controller *ctlr, *tmp;
@ -378,7 +379,8 @@ static struct rdac_controller *get_controller(int index, char *array_name,
list_for_each_entry(tmp, &ctlr_list, node) {
if ((memcmp(tmp->array_id, array_id, UNIQUE_ID_LEN) == 0) &&
(tmp->index == index)) {
(tmp->index == index) &&
(tmp->host == sdev->host)) {
kref_get(&tmp->kref);
spin_unlock(&list_lock);
return tmp;
@ -391,6 +393,7 @@ static struct rdac_controller *get_controller(int index, char *array_name,
/* initialize fields of controller */
memcpy(ctlr->array_id, array_id, UNIQUE_ID_LEN);
ctlr->index = index;
ctlr->host = sdev->host;
memcpy(ctlr->array_name, array_name, ARRAY_LABEL_LEN);
kref_init(&ctlr->kref);
@ -513,7 +516,7 @@ static int initialize_controller(struct scsi_device *sdev,
index = 0;
else
index = 1;
h->ctlr = get_controller(index, array_name, array_id);
h->ctlr = get_controller(index, array_name, array_id, sdev);
if (!h->ctlr)
err = SCSI_DH_RES_TEMP_UNAVAIL;
}