linux-stable/drivers/scsi/device_handler/scsi_dh_rdac.c
Martin Wilck 57adf5d4cf scsi: scsi_dh_rdac: zero cdb in send_mode_select()
cdb in send_mode_select() is not zeroed and is only partially filled in
rdac_failover_get(), which leads to some random data getting to the
device. Users have reported storage responding to such commands with
INVALID FIELD IN CDB. Code before commit 3278255741 was not affected, as
it called blk_rq_set_block_pc().

Fix this by zeroing out the cdb first.

Identified & fix proposed by HPE.

Fixes: 3278255741 ("scsi_dh_rdac: switch to scsi_execute_req_flags()")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20190904155205.1666-1-martin.wilck@suse.com
Signed-off-by: Martin Wilck <mwilck@suse.com>
Acked-by: Ales Novak <alnovak@suse.cz>
Reviewed-by: Shane Seymour <shane.seymour@hpe.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-09-10 21:25:36 -04:00

835 lines
20 KiB
C

/*
* LSI/Engenio/NetApp E-Series RDAC SCSI Device Handler
*
* Copyright (C) 2005 Mike Christie. All rights reserved.
* Copyright (C) Chandra Seetharaman, IBM Corp. 2007
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/
#include <scsi/scsi.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_dh.h>
#include <linux/workqueue.h>
#include <linux/slab.h>
#include <linux/module.h>
#define RDAC_NAME "rdac"
#define RDAC_RETRY_COUNT 5
/*
* LSI mode page stuff
*
* These struct definitions and the forming of the
* mode page were taken from the LSI RDAC 2.4 GPL'd
* driver, and then converted to Linux conventions.
*/
#define RDAC_QUIESCENCE_TIME 20
/*
* Page Codes
*/
#define RDAC_PAGE_CODE_REDUNDANT_CONTROLLER 0x2c
/*
* Controller modes definitions
*/
#define RDAC_MODE_TRANSFER_SPECIFIED_LUNS 0x02
/*
* RDAC Options field
*/
#define RDAC_FORCED_QUIESENCE 0x02
#define RDAC_TIMEOUT (60 * HZ)
#define RDAC_RETRIES 3
struct rdac_mode_6_hdr {
u8 data_len;
u8 medium_type;
u8 device_params;
u8 block_desc_len;
};
struct rdac_mode_10_hdr {
u16 data_len;
u8 medium_type;
u8 device_params;
u16 reserved;
u16 block_desc_len;
};
struct rdac_mode_common {
u8 controller_serial[16];
u8 alt_controller_serial[16];
u8 rdac_mode[2];
u8 alt_rdac_mode[2];
u8 quiescence_timeout;
u8 rdac_options;
};
struct rdac_pg_legacy {
struct rdac_mode_6_hdr hdr;
u8 page_code;
u8 page_len;
struct rdac_mode_common common;
#define MODE6_MAX_LUN 32
u8 lun_table[MODE6_MAX_LUN];
u8 reserved2[32];
u8 reserved3;
u8 reserved4;
};
struct rdac_pg_expanded {
struct rdac_mode_10_hdr hdr;
u8 page_code;
u8 subpage_code;
u8 page_len[2];
struct rdac_mode_common common;
u8 lun_table[256];
u8 reserved3;
u8 reserved4;
};
struct c9_inquiry {
u8 peripheral_info;
u8 page_code; /* 0xC9 */
u8 reserved1;
u8 page_len;
u8 page_id[4]; /* "vace" */
u8 avte_cvp;
u8 path_prio;
u8 reserved2[38];
};
#define SUBSYS_ID_LEN 16
#define SLOT_ID_LEN 2
#define ARRAY_LABEL_LEN 31
struct c4_inquiry {
u8 peripheral_info;
u8 page_code; /* 0xC4 */
u8 reserved1;
u8 page_len;
u8 page_id[4]; /* "subs" */
u8 subsys_id[SUBSYS_ID_LEN];
u8 revision[4];
u8 slot_id[SLOT_ID_LEN];
u8 reserved[2];
};
#define UNIQUE_ID_LEN 16
struct c8_inquiry {
u8 peripheral_info;
u8 page_code; /* 0xC8 */
u8 reserved1;
u8 page_len;
u8 page_id[4]; /* "edid" */
u8 reserved2[3];
u8 vol_uniq_id_len;
u8 vol_uniq_id[16];
u8 vol_user_label_len;
u8 vol_user_label[60];
u8 array_uniq_id_len;
u8 array_unique_id[UNIQUE_ID_LEN];
u8 array_user_label_len;
u8 array_user_label[60];
u8 lun[8];
};
struct rdac_controller {
u8 array_id[UNIQUE_ID_LEN];
int use_ms10;
struct kref kref;
struct list_head node; /* list of all controllers */
union {
struct rdac_pg_legacy legacy;
struct rdac_pg_expanded expanded;
} 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;
struct scsi_device *ms_sdev;
struct list_head ms_head;
struct list_head dh_list;
};
struct c2_inquiry {
u8 peripheral_info;
u8 page_code; /* 0xC2 */
u8 reserved1;
u8 page_len;
u8 page_id[4]; /* "swr4" */
u8 sw_version[3];
u8 sw_date[3];
u8 features_enabled;
u8 max_lun_supported;
u8 partitions[239]; /* Total allocation length should be 0xFF */
};
struct rdac_dh_data {
struct list_head node;
struct rdac_controller *ctlr;
struct scsi_device *sdev;
#define UNINITIALIZED_LUN (1 << 8)
unsigned lun;
#define RDAC_MODE 0
#define RDAC_MODE_AVT 1
#define RDAC_MODE_IOSHIP 2
unsigned char mode;
#define RDAC_STATE_ACTIVE 0
#define RDAC_STATE_PASSIVE 1
unsigned char state;
#define RDAC_LUN_UNOWNED 0
#define RDAC_LUN_OWNED 1
char lun_state;
#define RDAC_PREFERRED 0
#define RDAC_NON_PREFERRED 1
char preferred;
union {
struct c2_inquiry c2;
struct c4_inquiry c4;
struct c8_inquiry c8;
struct c9_inquiry c9;
} inq;
};
static const char *mode[] = {
"RDAC",
"AVT",
"IOSHIP",
};
static const char *lun_state[] =
{
"unowned",
"owned",
};
struct rdac_queue_data {
struct list_head entry;
struct rdac_dh_data *h;
activate_complete callback_fn;
void *callback_data;
};
static LIST_HEAD(ctlr_list);
static DEFINE_SPINLOCK(list_lock);
static struct workqueue_struct *kmpath_rdacd;
static void send_mode_select(struct work_struct *work);
/*
* module parameter to enable rdac debug logging.
* 2 bits for each type of logging, only two types defined for now
* Can be enhanced if required at later point
*/
static int rdac_logging = 1;
module_param(rdac_logging, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(rdac_logging, "A bit mask of rdac logging levels, "
"Default is 1 - failover logging enabled, "
"set it to 0xF to enable all the logs");
#define RDAC_LOG_FAILOVER 0
#define RDAC_LOG_SENSE 2
#define RDAC_LOG_BITS 2
#define RDAC_LOG_LEVEL(SHIFT) \
((rdac_logging >> (SHIFT)) & ((1 << (RDAC_LOG_BITS)) - 1))
#define RDAC_LOG(SHIFT, sdev, f, arg...) \
do { \
if (unlikely(RDAC_LOG_LEVEL(SHIFT))) \
sdev_printk(KERN_INFO, sdev, RDAC_NAME ": " f "\n", ## arg); \
} while (0);
static unsigned int rdac_failover_get(struct rdac_controller *ctlr,
struct list_head *list,
unsigned char *cdb)
{
struct rdac_mode_common *common;
unsigned data_size;
struct rdac_queue_data *qdata;
u8 *lun_table;
if (ctlr->use_ms10) {
struct rdac_pg_expanded *rdac_pg;
data_size = sizeof(struct rdac_pg_expanded);
rdac_pg = &ctlr->mode_select.expanded;
memset(rdac_pg, 0, data_size);
common = &rdac_pg->common;
rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER + 0x40;
rdac_pg->subpage_code = 0x1;
rdac_pg->page_len[0] = 0x01;
rdac_pg->page_len[1] = 0x28;
lun_table = rdac_pg->lun_table;
} else {
struct rdac_pg_legacy *rdac_pg;
data_size = sizeof(struct rdac_pg_legacy);
rdac_pg = &ctlr->mode_select.legacy;
memset(rdac_pg, 0, data_size);
common = &rdac_pg->common;
rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER;
rdac_pg->page_len = 0x68;
lun_table = rdac_pg->lun_table;
}
common->rdac_mode[1] = RDAC_MODE_TRANSFER_SPECIFIED_LUNS;
common->quiescence_timeout = RDAC_QUIESCENCE_TIME;
common->rdac_options = RDAC_FORCED_QUIESENCE;
list_for_each_entry(qdata, list, entry) {
lun_table[qdata->h->lun] = 0x81;
}
/* Prepare the command. */
if (ctlr->use_ms10) {
cdb[0] = MODE_SELECT_10;
cdb[7] = data_size >> 8;
cdb[8] = data_size & 0xff;
} else {
cdb[0] = MODE_SELECT;
cdb[4] = data_size;
}
return data_size;
}
static void release_controller(struct kref *kref)
{
struct rdac_controller *ctlr;
ctlr = container_of(kref, struct rdac_controller, kref);
list_del(&ctlr->node);
kfree(ctlr);
}
static struct rdac_controller *get_controller(int index, char *array_name,
u8 *array_id, struct scsi_device *sdev)
{
struct rdac_controller *ctlr, *tmp;
list_for_each_entry(tmp, &ctlr_list, node) {
if ((memcmp(tmp->array_id, array_id, UNIQUE_ID_LEN) == 0) &&
(tmp->index == index) &&
(tmp->host == sdev->host)) {
kref_get(&tmp->kref);
return tmp;
}
}
ctlr = kmalloc(sizeof(*ctlr), GFP_ATOMIC);
if (!ctlr)
return NULL;
/* 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);
ctlr->use_ms10 = -1;
ctlr->ms_queued = 0;
ctlr->ms_sdev = NULL;
spin_lock_init(&ctlr->ms_lock);
INIT_WORK(&ctlr->ms_work, send_mode_select);
INIT_LIST_HEAD(&ctlr->ms_head);
list_add(&ctlr->node, &ctlr_list);
INIT_LIST_HEAD(&ctlr->dh_list);
return ctlr;
}
static int get_lun_info(struct scsi_device *sdev, struct rdac_dh_data *h,
char *array_name, u8 *array_id)
{
int err = SCSI_DH_IO, i;
struct c8_inquiry *inqp = &h->inq.c8;
if (!scsi_get_vpd_page(sdev, 0xC8, (unsigned char *)inqp,
sizeof(struct c8_inquiry))) {
if (inqp->page_code != 0xc8)
return SCSI_DH_NOSYS;
if (inqp->page_id[0] != 'e' || inqp->page_id[1] != 'd' ||
inqp->page_id[2] != 'i' || inqp->page_id[3] != 'd')
return SCSI_DH_NOSYS;
h->lun = inqp->lun[7]; /* Uses only the last byte */
for(i=0; i<ARRAY_LABEL_LEN-1; ++i)
*(array_name+i) = inqp->array_user_label[(2*i)+1];
*(array_name+ARRAY_LABEL_LEN-1) = '\0';
memset(array_id, 0, UNIQUE_ID_LEN);
memcpy(array_id, inqp->array_unique_id, inqp->array_uniq_id_len);
err = SCSI_DH_OK;
}
return err;
}
static int check_ownership(struct scsi_device *sdev, struct rdac_dh_data *h)
{
int err = SCSI_DH_IO, access_state;
struct rdac_dh_data *tmp;
struct c9_inquiry *inqp = &h->inq.c9;
h->state = RDAC_STATE_ACTIVE;
if (!scsi_get_vpd_page(sdev, 0xC9, (unsigned char *)inqp,
sizeof(struct c9_inquiry))) {
/* detect the operating mode */
if ((inqp->avte_cvp >> 5) & 0x1)
h->mode = RDAC_MODE_IOSHIP; /* LUN in IOSHIP mode */
else if (inqp->avte_cvp >> 7)
h->mode = RDAC_MODE_AVT; /* LUN in AVT mode */
else
h->mode = RDAC_MODE; /* LUN in RDAC mode */
/* Update ownership */
if (inqp->avte_cvp & 0x1) {
h->lun_state = RDAC_LUN_OWNED;
access_state = SCSI_ACCESS_STATE_OPTIMAL;
} else {
h->lun_state = RDAC_LUN_UNOWNED;
if (h->mode == RDAC_MODE) {
h->state = RDAC_STATE_PASSIVE;
access_state = SCSI_ACCESS_STATE_STANDBY;
} else
access_state = SCSI_ACCESS_STATE_ACTIVE;
}
/* Update path prio*/
if (inqp->path_prio & 0x1) {
h->preferred = RDAC_PREFERRED;
access_state |= SCSI_ACCESS_STATE_PREFERRED;
} else
h->preferred = RDAC_NON_PREFERRED;
rcu_read_lock();
list_for_each_entry_rcu(tmp, &h->ctlr->dh_list, node) {
/* h->sdev should always be valid */
BUG_ON(!tmp->sdev);
tmp->sdev->access_state = access_state;
}
rcu_read_unlock();
err = SCSI_DH_OK;
}
return err;
}
static int initialize_controller(struct scsi_device *sdev,
struct rdac_dh_data *h, char *array_name, u8 *array_id)
{
int err = SCSI_DH_IO, index;
struct c4_inquiry *inqp = &h->inq.c4;
if (!scsi_get_vpd_page(sdev, 0xC4, (unsigned char *)inqp,
sizeof(struct c4_inquiry))) {
/* get the controller index */
if (inqp->slot_id[1] == 0x31)
index = 0;
else
index = 1;
spin_lock(&list_lock);
h->ctlr = get_controller(index, array_name, array_id, sdev);
if (!h->ctlr)
err = SCSI_DH_RES_TEMP_UNAVAIL;
else {
list_add_rcu(&h->node, &h->ctlr->dh_list);
h->sdev = sdev;
}
spin_unlock(&list_lock);
err = SCSI_DH_OK;
}
return err;
}
static int set_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h)
{
int err = SCSI_DH_IO;
struct c2_inquiry *inqp = &h->inq.c2;
if (!scsi_get_vpd_page(sdev, 0xC2, (unsigned char *)inqp,
sizeof(struct c2_inquiry))) {
/*
* If more than MODE6_MAX_LUN luns are supported, use
* mode select 10
*/
if (inqp->max_lun_supported >= MODE6_MAX_LUN)
h->ctlr->use_ms10 = 1;
else
h->ctlr->use_ms10 = 0;
err = SCSI_DH_OK;
}
return err;
}
static int mode_select_handle_sense(struct scsi_device *sdev,
struct scsi_sense_hdr *sense_hdr)
{
int err = SCSI_DH_IO;
struct rdac_dh_data *h = sdev->handler_data;
if (!scsi_sense_valid(sense_hdr))
goto done;
switch (sense_hdr->sense_key) {
case NO_SENSE:
case ABORTED_COMMAND:
case UNIT_ATTENTION:
err = SCSI_DH_RETRY;
break;
case NOT_READY:
if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x01)
/* LUN Not Ready and is in the Process of Becoming
* Ready
*/
err = SCSI_DH_RETRY;
break;
case ILLEGAL_REQUEST:
if (sense_hdr->asc == 0x91 && sense_hdr->ascq == 0x36)
/*
* Command Lock contention
*/
err = SCSI_DH_IMM_RETRY;
break;
default:
break;
}
RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
"MODE_SELECT returned with sense %02x/%02x/%02x",
(char *) h->ctlr->array_name, h->ctlr->index,
sense_hdr->sense_key, sense_hdr->asc, sense_hdr->ascq);
done:
return err;
}
static void send_mode_select(struct work_struct *work)
{
struct rdac_controller *ctlr =
container_of(work, struct rdac_controller, ms_work);
struct scsi_device *sdev = ctlr->ms_sdev;
struct rdac_dh_data *h = sdev->handler_data;
int err = SCSI_DH_OK, retry_cnt = RDAC_RETRY_COUNT;
struct rdac_queue_data *tmp, *qdata;
LIST_HEAD(list);
unsigned char cdb[MAX_COMMAND_SIZE];
struct scsi_sense_hdr sshdr;
unsigned int data_size;
u64 req_flags = REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
REQ_FAILFAST_DRIVER;
spin_lock(&ctlr->ms_lock);
list_splice_init(&ctlr->ms_head, &list);
ctlr->ms_queued = 0;
ctlr->ms_sdev = NULL;
spin_unlock(&ctlr->ms_lock);
retry:
memset(cdb, 0, sizeof(cdb));
data_size = rdac_failover_get(ctlr, &list, cdb);
RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
"%s MODE_SELECT command",
(char *) h->ctlr->array_name, h->ctlr->index,
(retry_cnt == RDAC_RETRY_COUNT) ? "queueing" : "retrying");
if (scsi_execute(sdev, cdb, DMA_TO_DEVICE, &h->ctlr->mode_select,
data_size, NULL, &sshdr, RDAC_TIMEOUT * HZ,
RDAC_RETRIES, req_flags, 0, NULL)) {
err = mode_select_handle_sense(sdev, &sshdr);
if (err == SCSI_DH_RETRY && retry_cnt--)
goto retry;
if (err == SCSI_DH_IMM_RETRY)
goto retry;
}
if (err == SCSI_DH_OK) {
h->state = RDAC_STATE_ACTIVE;
RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
"MODE_SELECT completed",
(char *) h->ctlr->array_name, h->ctlr->index);
}
list_for_each_entry_safe(qdata, tmp, &list, entry) {
list_del(&qdata->entry);
if (err == SCSI_DH_OK)
qdata->h->state = RDAC_STATE_ACTIVE;
if (qdata->callback_fn)
qdata->callback_fn(qdata->callback_data, err);
kfree(qdata);
}
return;
}
static int queue_mode_select(struct scsi_device *sdev,
activate_complete fn, void *data)
{
struct rdac_queue_data *qdata;
struct rdac_controller *ctlr;
qdata = kzalloc(sizeof(*qdata), GFP_KERNEL);
if (!qdata)
return SCSI_DH_RETRY;
qdata->h = sdev->handler_data;
qdata->callback_fn = fn;
qdata->callback_data = data;
ctlr = qdata->h->ctlr;
spin_lock(&ctlr->ms_lock);
list_add_tail(&qdata->entry, &ctlr->ms_head);
if (!ctlr->ms_queued) {
ctlr->ms_queued = 1;
ctlr->ms_sdev = sdev;
queue_work(kmpath_rdacd, &ctlr->ms_work);
}
spin_unlock(&ctlr->ms_lock);
return SCSI_DH_OK;
}
static int rdac_activate(struct scsi_device *sdev,
activate_complete fn, void *data)
{
struct rdac_dh_data *h = sdev->handler_data;
int err = SCSI_DH_OK;
int act = 0;
err = check_ownership(sdev, h);
if (err != SCSI_DH_OK)
goto done;
switch (h->mode) {
case RDAC_MODE:
if (h->lun_state == RDAC_LUN_UNOWNED)
act = 1;
break;
case RDAC_MODE_IOSHIP:
if ((h->lun_state == RDAC_LUN_UNOWNED) &&
(h->preferred == RDAC_PREFERRED))
act = 1;
break;
default:
break;
}
if (act) {
err = queue_mode_select(sdev, fn, data);
if (err == SCSI_DH_OK)
return 0;
}
done:
if (fn)
fn(data, err);
return 0;
}
static blk_status_t rdac_prep_fn(struct scsi_device *sdev, struct request *req)
{
struct rdac_dh_data *h = sdev->handler_data;
if (h->state != RDAC_STATE_ACTIVE) {
req->rq_flags |= RQF_QUIET;
return BLK_STS_IOERR;
}
return BLK_STS_OK;
}
static int rdac_check_sense(struct scsi_device *sdev,
struct scsi_sense_hdr *sense_hdr)
{
struct rdac_dh_data *h = sdev->handler_data;
RDAC_LOG(RDAC_LOG_SENSE, sdev, "array %s, ctlr %d, "
"I/O returned with sense %02x/%02x/%02x",
(char *) h->ctlr->array_name, h->ctlr->index,
sense_hdr->sense_key, sense_hdr->asc, sense_hdr->ascq);
switch (sense_hdr->sense_key) {
case NOT_READY:
if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x01)
/* LUN Not Ready - Logical Unit Not Ready and is in
* the process of becoming ready
* Just retry.
*/
return ADD_TO_MLQUEUE;
if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x81)
/* LUN Not Ready - Storage firmware incompatible
* Manual code synchonisation required.
*
* Nothing we can do here. Try to bypass the path.
*/
return SUCCESS;
if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0xA1)
/* LUN Not Ready - Quiescense in progress
*
* Just retry and wait.
*/
return ADD_TO_MLQUEUE;
if (sense_hdr->asc == 0xA1 && sense_hdr->ascq == 0x02)
/* LUN Not Ready - Quiescense in progress
* or has been achieved
* Just retry.
*/
return ADD_TO_MLQUEUE;
break;
case ILLEGAL_REQUEST:
if (sense_hdr->asc == 0x94 && sense_hdr->ascq == 0x01) {
/* Invalid Request - Current Logical Unit Ownership.
* Controller is not the current owner of the LUN,
* Fail the path, so that the other path be used.
*/
h->state = RDAC_STATE_PASSIVE;
return SUCCESS;
}
break;
case UNIT_ATTENTION:
if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00)
/*
* Power On, Reset, or Bus Device Reset, just retry.
*/
return ADD_TO_MLQUEUE;
if (sense_hdr->asc == 0x8b && sense_hdr->ascq == 0x02)
/*
* Quiescence in progress , just retry.
*/
return ADD_TO_MLQUEUE;
break;
}
/* success just means we do not care what scsi-ml does */
return SCSI_RETURN_NOT_HANDLED;
}
static int rdac_bus_attach(struct scsi_device *sdev)
{
struct rdac_dh_data *h;
int err;
char array_name[ARRAY_LABEL_LEN];
char array_id[UNIQUE_ID_LEN];
h = kzalloc(sizeof(*h) , GFP_KERNEL);
if (!h)
return SCSI_DH_NOMEM;
h->lun = UNINITIALIZED_LUN;
h->state = RDAC_STATE_ACTIVE;
err = get_lun_info(sdev, h, array_name, array_id);
if (err != SCSI_DH_OK)
goto failed;
err = initialize_controller(sdev, h, array_name, array_id);
if (err != SCSI_DH_OK)
goto failed;
err = check_ownership(sdev, h);
if (err != SCSI_DH_OK)
goto clean_ctlr;
err = set_mode_select(sdev, h);
if (err != SCSI_DH_OK)
goto clean_ctlr;
sdev_printk(KERN_NOTICE, sdev,
"%s: LUN %d (%s) (%s)\n",
RDAC_NAME, h->lun, mode[(int)h->mode],
lun_state[(int)h->lun_state]);
sdev->handler_data = h;
return SCSI_DH_OK;
clean_ctlr:
spin_lock(&list_lock);
kref_put(&h->ctlr->kref, release_controller);
spin_unlock(&list_lock);
failed:
kfree(h);
return err;
}
static void rdac_bus_detach( struct scsi_device *sdev )
{
struct rdac_dh_data *h = sdev->handler_data;
if (h->ctlr && h->ctlr->ms_queued)
flush_workqueue(kmpath_rdacd);
spin_lock(&list_lock);
if (h->ctlr) {
list_del_rcu(&h->node);
h->sdev = NULL;
kref_put(&h->ctlr->kref, release_controller);
}
spin_unlock(&list_lock);
sdev->handler_data = NULL;
kfree(h);
}
static struct scsi_device_handler rdac_dh = {
.name = RDAC_NAME,
.module = THIS_MODULE,
.prep_fn = rdac_prep_fn,
.check_sense = rdac_check_sense,
.attach = rdac_bus_attach,
.detach = rdac_bus_detach,
.activate = rdac_activate,
};
static int __init rdac_init(void)
{
int r;
r = scsi_register_device_handler(&rdac_dh);
if (r != 0) {
printk(KERN_ERR "Failed to register scsi device handler.");
goto done;
}
/*
* Create workqueue to handle mode selects for rdac
*/
kmpath_rdacd = create_singlethread_workqueue("kmpath_rdacd");
if (!kmpath_rdacd) {
scsi_unregister_device_handler(&rdac_dh);
printk(KERN_ERR "kmpath_rdacd creation failed.\n");
r = -EINVAL;
}
done:
return r;
}
static void __exit rdac_exit(void)
{
destroy_workqueue(kmpath_rdacd);
scsi_unregister_device_handler(&rdac_dh);
}
module_init(rdac_init);
module_exit(rdac_exit);
MODULE_DESCRIPTION("Multipath LSI/Engenio/NetApp E-Series RDAC driver");
MODULE_AUTHOR("Mike Christie, Chandra Seetharaman");
MODULE_VERSION("01.00.0000.0000");
MODULE_LICENSE("GPL");