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authorChandra Seetharaman <sekharan@us.ibm.com>2011-07-27 22:22:56 +0400
committerJames Bottomley <JBottomley@Parallels.com>2011-07-28 11:38:47 +0400
commitd6857595394f1fa5c5752eae9bb6045c067fa41e (patch)
treec9723dd0fdf17843a431d2c79e9791682b70e109 /drivers/scsi/device_handler
parentf170c684b55cb8d3bab55b1fb8fa812778d551f2 (diff)
downloadlinux-d6857595394f1fa5c5752eae9bb6045c067fa41e.tar.xz
[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>
Diffstat (limited to 'drivers/scsi/device_handler')
-rw-r--r--drivers/scsi/device_handler/scsi_dh_rdac.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/scsi/device_handler/scsi_dh_rdac.c b/drivers/scsi/device_handler/scsi_dh_rdac.c
index f57009b348d6..27c9d65d54a9 100644
--- a/drivers/scsi/device_handler/scsi_dh_rdac.c
+++ b/drivers/scsi/device_handler/scsi_dh_rdac.c
@@ -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;
}