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OpenCloudOS-Kernel/drivers/scsi/scsi_sysfs.c

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// SPDX-License-Identifier: GPL-2.0-only
/*
* scsi_sysfs.c
*
* SCSI sysfs interface routines.
*
* Created to pull SCSI mid layer sysfs routines into one file.
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/device.h>
#include <linux/pm_runtime.h>
#include <scsi/scsi.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsi_dh.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_driver.h>
#include <scsi/scsi_devinfo.h>
#include "scsi_priv.h"
#include "scsi_logging.h"
static struct device_type scsi_dev_type;
static const struct {
enum scsi_device_state value;
char *name;
} sdev_states[] = {
{ SDEV_CREATED, "created" },
{ SDEV_RUNNING, "running" },
{ SDEV_CANCEL, "cancel" },
{ SDEV_DEL, "deleted" },
{ SDEV_QUIESCE, "quiesce" },
{ SDEV_OFFLINE, "offline" },
{ SDEV_TRANSPORT_OFFLINE, "transport-offline" },
{ SDEV_BLOCK, "blocked" },
{ SDEV_CREATED_BLOCK, "created-blocked" },
};
const char *scsi_device_state_name(enum scsi_device_state state)
{
int i;
char *name = NULL;
for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
if (sdev_states[i].value == state) {
name = sdev_states[i].name;
break;
}
}
return name;
}
static const struct {
enum scsi_host_state value;
char *name;
} shost_states[] = {
{ SHOST_CREATED, "created" },
{ SHOST_RUNNING, "running" },
{ SHOST_CANCEL, "cancel" },
{ SHOST_DEL, "deleted" },
{ SHOST_RECOVERY, "recovery" },
{ SHOST_CANCEL_RECOVERY, "cancel/recovery" },
{ SHOST_DEL_RECOVERY, "deleted/recovery", },
};
const char *scsi_host_state_name(enum scsi_host_state state)
{
int i;
char *name = NULL;
for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
if (shost_states[i].value == state) {
name = shost_states[i].name;
break;
}
}
return name;
}
#ifdef CONFIG_SCSI_DH
static const struct {
unsigned char value;
char *name;
} sdev_access_states[] = {
{ SCSI_ACCESS_STATE_OPTIMAL, "active/optimized" },
{ SCSI_ACCESS_STATE_ACTIVE, "active/non-optimized" },
{ SCSI_ACCESS_STATE_STANDBY, "standby" },
{ SCSI_ACCESS_STATE_UNAVAILABLE, "unavailable" },
{ SCSI_ACCESS_STATE_LBA, "lba-dependent" },
{ SCSI_ACCESS_STATE_OFFLINE, "offline" },
{ SCSI_ACCESS_STATE_TRANSITIONING, "transitioning" },
};
static const char *scsi_access_state_name(unsigned char state)
{
int i;
char *name = NULL;
for (i = 0; i < ARRAY_SIZE(sdev_access_states); i++) {
if (sdev_access_states[i].value == state) {
name = sdev_access_states[i].name;
break;
}
}
return name;
}
#endif
static int check_set(unsigned long long *val, char *src)
{
char *last;
if (strcmp(src, "-") == 0) {
*val = SCAN_WILD_CARD;
} else {
/*
* Doesn't check for int overflow
*/
*val = simple_strtoull(src, &last, 0);
if (*last != '\0')
return 1;
}
return 0;
}
static int scsi_scan(struct Scsi_Host *shost, const char *str)
{
char s1[15], s2[15], s3[17], junk;
unsigned long long channel, id, lun;
int res;
res = sscanf(str, "%10s %10s %16s %c", s1, s2, s3, &junk);
if (res != 3)
return -EINVAL;
if (check_set(&channel, s1))
return -EINVAL;
if (check_set(&id, s2))
return -EINVAL;
if (check_set(&lun, s3))
return -EINVAL;
if (shost->transportt->user_scan)
res = shost->transportt->user_scan(shost, channel, id, lun);
else
res = scsi_scan_host_selected(shost, channel, id, lun,
SCSI_SCAN_MANUAL);
return res;
}
/*
* shost_show_function: macro to create an attr function that can be used to
* show a non-bit field.
*/
#define shost_show_function(name, field, format_string) \
static ssize_t \
show_##name (struct device *dev, struct device_attribute *attr, \
char *buf) \
{ \
struct Scsi_Host *shost = class_to_shost(dev); \
return snprintf (buf, 20, format_string, shost->field); \
}
/*
* shost_rd_attr: macro to create a function and attribute variable for a
* read only field.
*/
#define shost_rd_attr2(name, field, format_string) \
shost_show_function(name, field, format_string) \
static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
#define shost_rd_attr(field, format_string) \
shost_rd_attr2(field, field, format_string)
/*
* Create the actual show/store functions and data structures.
*/
static ssize_t
store_scan(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct Scsi_Host *shost = class_to_shost(dev);
int res;
res = scsi_scan(shost, buf);
if (res == 0)
res = count;
return res;
};
static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
static ssize_t
store_shost_state(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
int i;
struct Scsi_Host *shost = class_to_shost(dev);
enum scsi_host_state state = 0;
for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
const int len = strlen(shost_states[i].name);
if (strncmp(shost_states[i].name, buf, len) == 0 &&
buf[len] == '\n') {
state = shost_states[i].value;
break;
}
}
if (!state)
return -EINVAL;
if (scsi_host_set_state(shost, state))
return -EINVAL;
return count;
}
static ssize_t
show_shost_state(struct device *dev, struct device_attribute *attr, char *buf)
{
struct Scsi_Host *shost = class_to_shost(dev);
const char *name = scsi_host_state_name(shost->shost_state);
if (!name)
return -EINVAL;
return snprintf(buf, 20, "%s\n", name);
}
/* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */
static struct device_attribute dev_attr_hstate =
__ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
static ssize_t
show_shost_mode(unsigned int mode, char *buf)
{
ssize_t len = 0;
if (mode & MODE_INITIATOR)
len = sprintf(buf, "%s", "Initiator");
if (mode & MODE_TARGET)
len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target");
len += sprintf(buf + len, "\n");
return len;
}
static ssize_t
show_shost_supported_mode(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct Scsi_Host *shost = class_to_shost(dev);
unsigned int supported_mode = shost->hostt->supported_mode;
if (supported_mode == MODE_UNKNOWN)
/* by default this should be initiator */
supported_mode = MODE_INITIATOR;
return show_shost_mode(supported_mode, buf);
}
static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
static ssize_t
show_shost_active_mode(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct Scsi_Host *shost = class_to_shost(dev);
if (shost->active_mode == MODE_UNKNOWN)
return snprintf(buf, 20, "unknown\n");
else
return show_shost_mode(shost->active_mode, buf);
}
static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
static int check_reset_type(const char *str)
{
if (sysfs_streq(str, "adapter"))
return SCSI_ADAPTER_RESET;
else if (sysfs_streq(str, "firmware"))
return SCSI_FIRMWARE_RESET;
else
return 0;
}
static ssize_t
store_host_reset(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct Scsi_Host *shost = class_to_shost(dev);
struct scsi_host_template *sht = shost->hostt;
int ret = -EINVAL;
int type;
type = check_reset_type(buf);
if (!type)
goto exit_store_host_reset;
if (sht->host_reset)
ret = sht->host_reset(shost, type);
else
ret = -EOPNOTSUPP;
exit_store_host_reset:
if (ret == 0)
ret = count;
return ret;
}
static DEVICE_ATTR(host_reset, S_IWUSR, NULL, store_host_reset);
static ssize_t
show_shost_eh_deadline(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct Scsi_Host *shost = class_to_shost(dev);
if (shost->eh_deadline == -1)
return snprintf(buf, strlen("off") + 2, "off\n");
return sprintf(buf, "%u\n", shost->eh_deadline / HZ);
}
static ssize_t
store_shost_eh_deadline(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct Scsi_Host *shost = class_to_shost(dev);
int ret = -EINVAL;
unsigned long deadline, flags;
if (shost->transportt &&
(shost->transportt->eh_strategy_handler ||
!shost->hostt->eh_host_reset_handler))
return ret;
if (!strncmp(buf, "off", strlen("off")))
deadline = -1;
else {
ret = kstrtoul(buf, 10, &deadline);
if (ret)
return ret;
if (deadline * HZ > UINT_MAX)
return -EINVAL;
}
spin_lock_irqsave(shost->host_lock, flags);
if (scsi_host_in_recovery(shost))
ret = -EBUSY;
else {
if (deadline == -1)
shost->eh_deadline = -1;
else
shost->eh_deadline = deadline * HZ;
ret = count;
}
spin_unlock_irqrestore(shost->host_lock, flags);
return ret;
}
static DEVICE_ATTR(eh_deadline, S_IRUGO | S_IWUSR, show_shost_eh_deadline, store_shost_eh_deadline);
shost_rd_attr(unique_id, "%u\n");
shost_rd_attr(cmd_per_lun, "%hd\n");
shost_rd_attr(can_queue, "%hd\n");
shost_rd_attr(sg_tablesize, "%hu\n");
shost_rd_attr(sg_prot_tablesize, "%hu\n");
shost_rd_attr(unchecked_isa_dma, "%d\n");
shost_rd_attr(prot_capabilities, "%u\n");
shost_rd_attr(prot_guard_type, "%hd\n");
shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
static ssize_t
show_host_busy(struct device *dev, struct device_attribute *attr, char *buf)
{
struct Scsi_Host *shost = class_to_shost(dev);
return snprintf(buf, 20, "%d\n", scsi_host_busy(shost));
}
static DEVICE_ATTR(host_busy, S_IRUGO, show_host_busy, NULL);
static ssize_t
show_use_blk_mq(struct device *dev, struct device_attribute *attr, char *buf)
{
return sprintf(buf, "1\n");
}
static DEVICE_ATTR(use_blk_mq, S_IRUGO, show_use_blk_mq, NULL);
static struct attribute *scsi_sysfs_shost_attrs[] = {
&dev_attr_use_blk_mq.attr,
&dev_attr_unique_id.attr,
&dev_attr_host_busy.attr,
&dev_attr_cmd_per_lun.attr,
&dev_attr_can_queue.attr,
&dev_attr_sg_tablesize.attr,
&dev_attr_sg_prot_tablesize.attr,
&dev_attr_unchecked_isa_dma.attr,
&dev_attr_proc_name.attr,
&dev_attr_scan.attr,
&dev_attr_hstate.attr,
&dev_attr_supported_mode.attr,
&dev_attr_active_mode.attr,
&dev_attr_prot_capabilities.attr,
&dev_attr_prot_guard_type.attr,
&dev_attr_host_reset.attr,
&dev_attr_eh_deadline.attr,
NULL
};
static struct attribute_group scsi_shost_attr_group = {
.attrs = scsi_sysfs_shost_attrs,
};
const struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
&scsi_shost_attr_group,
NULL
};
static void scsi_device_cls_release(struct device *class_dev)
{
struct scsi_device *sdev;
sdev = class_to_sdev(class_dev);
put_device(&sdev->sdev_gendev);
}
static void scsi_device_dev_release_usercontext(struct work_struct *work)
{
struct scsi_device *sdev;
struct device *parent;
struct list_head *this, *tmp;
struct scsi_vpd *vpd_pg80 = NULL, *vpd_pg83 = NULL;
unsigned long flags;
struct module *mod;
sdev = container_of(work, struct scsi_device, ew.work);
mod = sdev->host->hostt->module;
scsi_dh_release_device(sdev);
parent = sdev->sdev_gendev.parent;
spin_lock_irqsave(sdev->host->host_lock, flags);
list_del(&sdev->siblings);
list_del(&sdev->same_target_siblings);
list_del(&sdev->starved_entry);
spin_unlock_irqrestore(sdev->host->host_lock, flags);
cancel_work_sync(&sdev->event_work);
list_for_each_safe(this, tmp, &sdev->event_list) {
struct scsi_event *evt;
evt = list_entry(this, struct scsi_event, node);
list_del(&evt->node);
kfree(evt);
}
blk_put_queue(sdev->request_queue);
/* NULL queue means the device can't be used */
sdev->request_queue = NULL;
mutex_lock(&sdev->inquiry_mutex);
rcu_swap_protected(sdev->vpd_pg80, vpd_pg80,
lockdep_is_held(&sdev->inquiry_mutex));
rcu_swap_protected(sdev->vpd_pg83, vpd_pg83,
lockdep_is_held(&sdev->inquiry_mutex));
mutex_unlock(&sdev->inquiry_mutex);
if (vpd_pg83)
kfree_rcu(vpd_pg83, rcu);
if (vpd_pg80)
kfree_rcu(vpd_pg80, rcu);
kfree(sdev->inquiry);
kfree(sdev);
if (parent)
put_device(parent);
module_put(mod);
}
static void scsi_device_dev_release(struct device *dev)
{
struct scsi_device *sdp = to_scsi_device(dev);
/* Set module pointer as NULL in case of module unloading */
if (!try_module_get(sdp->host->hostt->module))
sdp->host->hostt->module = NULL;
execute_in_process_context(scsi_device_dev_release_usercontext,
&sdp->ew);
}
static struct class sdev_class = {
.name = "scsi_device",
.dev_release = scsi_device_cls_release,
};
/* all probing is done in the individual ->probe routines */
static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
{
struct scsi_device *sdp;
if (dev->type != &scsi_dev_type)
return 0;
sdp = to_scsi_device(dev);
if (sdp->no_uld_attach)
return 0;
return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
}
static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
{
struct scsi_device *sdev;
if (dev->type != &scsi_dev_type)
return 0;
sdev = to_scsi_device(dev);
add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
return 0;
}
struct bus_type scsi_bus_type = {
.name = "scsi",
.match = scsi_bus_match,
.uevent = scsi_bus_uevent,
#ifdef CONFIG_PM
.pm = &scsi_bus_pm_ops,
#endif
};
EXPORT_SYMBOL_GPL(scsi_bus_type);
int scsi_sysfs_register(void)
{
int error;
error = bus_register(&scsi_bus_type);
if (!error) {
error = class_register(&sdev_class);
if (error)
bus_unregister(&scsi_bus_type);
}
return error;
}
void scsi_sysfs_unregister(void)
{
class_unregister(&sdev_class);
bus_unregister(&scsi_bus_type);
}
/*
* sdev_show_function: macro to create an attr function that can be used to
* show a non-bit field.
*/
#define sdev_show_function(field, format_string) \
static ssize_t \
sdev_show_##field (struct device *dev, struct device_attribute *attr, \
char *buf) \
{ \
struct scsi_device *sdev; \
sdev = to_scsi_device(dev); \
return snprintf (buf, 20, format_string, sdev->field); \
} \
/*
* sdev_rd_attr: macro to create a function and attribute variable for a
* read only field.
*/
#define sdev_rd_attr(field, format_string) \
sdev_show_function(field, format_string) \
static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
/*
* sdev_rw_attr: create a function and attribute variable for a
* read/write field.
*/
#define sdev_rw_attr(field, format_string) \
sdev_show_function(field, format_string) \
\
static ssize_t \
sdev_store_##field (struct device *dev, struct device_attribute *attr, \
const char *buf, size_t count) \
{ \
struct scsi_device *sdev; \
sdev = to_scsi_device(dev); \
sscanf (buf, format_string, &sdev->field); \
return count; \
} \
static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
/* Currently we don't export bit fields, but we might in future,
* so leave this code in */
#if 0
/*
* sdev_rd_attr: create a function and attribute variable for a
* read/write bit field.
*/
#define sdev_rw_attr_bit(field) \
sdev_show_function(field, "%d\n") \
\
static ssize_t \
sdev_store_##field (struct device *dev, struct device_attribute *attr, \
const char *buf, size_t count) \
{ \
int ret; \
struct scsi_device *sdev; \
ret = scsi_sdev_check_buf_bit(buf); \
if (ret >= 0) { \
sdev = to_scsi_device(dev); \
sdev->field = ret; \
ret = count; \
} \
return ret; \
} \
static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
/*
* scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
* else return -EINVAL.
*/
static int scsi_sdev_check_buf_bit(const char *buf)
{
if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
if (buf[0] == '1')
return 1;
else if (buf[0] == '0')
return 0;
else
return -EINVAL;
} else
return -EINVAL;
}
#endif
/*
* Create the actual show/store functions and data structures.
*/
sdev_rd_attr (type, "%d\n");
sdev_rd_attr (scsi_level, "%d\n");
sdev_rd_attr (vendor, "%.8s\n");
sdev_rd_attr (model, "%.16s\n");
sdev_rd_attr (rev, "%.4s\n");
static ssize_t
sdev_show_device_busy(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct scsi_device *sdev = to_scsi_device(dev);
return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_busy));
}
static DEVICE_ATTR(device_busy, S_IRUGO, sdev_show_device_busy, NULL);
static ssize_t
sdev_show_device_blocked(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct scsi_device *sdev = to_scsi_device(dev);
return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_blocked));
}
static DEVICE_ATTR(device_blocked, S_IRUGO, sdev_show_device_blocked, NULL);
/*
* TODO: can we make these symlinks to the block layer ones?
*/
static ssize_t
sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
{
struct scsi_device *sdev;
sdev = to_scsi_device(dev);
return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
}
static ssize_t
sdev_store_timeout (struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct scsi_device *sdev;
int timeout;
sdev = to_scsi_device(dev);
sscanf (buf, "%d\n", &timeout);
blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
return count;
}
static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
static ssize_t
sdev_show_eh_timeout(struct device *dev, struct device_attribute *attr, char *buf)
{
struct scsi_device *sdev;
sdev = to_scsi_device(dev);
return snprintf(buf, 20, "%u\n", sdev->eh_timeout / HZ);
}
static ssize_t
sdev_store_eh_timeout(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct scsi_device *sdev;
unsigned int eh_timeout;
int err;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
sdev = to_scsi_device(dev);
err = kstrtouint(buf, 10, &eh_timeout);
if (err)
return err;
sdev->eh_timeout = eh_timeout * HZ;
return count;
}
static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout);
static ssize_t
store_rescan_field (struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
scsi_rescan_device(dev);
return count;
}
static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
static ssize_t
sdev_store_delete(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct kernfs_node *kn;
struct scsi_device *sdev = to_scsi_device(dev);
/*
* We need to try to get module, avoiding the module been removed
* during delete.
*/
if (scsi_device_get(sdev))
return -ENODEV;
kn = sysfs_break_active_protection(&dev->kobj, &attr->attr);
WARN_ON_ONCE(!kn);
/*
* Concurrent writes into the "delete" sysfs attribute may trigger
* concurrent calls to device_remove_file() and scsi_remove_device().
* device_remove_file() handles concurrent removal calls by
* serializing these and by ignoring the second and later removal
* attempts. Concurrent calls of scsi_remove_device() are
* serialized. The second and later calls of scsi_remove_device() are
* ignored because the first call of that function changes the device
* state into SDEV_DEL.
*/
device_remove_file(dev, attr);
scsi_remove_device(sdev);
if (kn)
sysfs_unbreak_active_protection(kn);
scsi_device_put(sdev);
return count;
};
static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
static ssize_t
store_state_field(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
int i, ret;
struct scsi_device *sdev = to_scsi_device(dev);
enum scsi_device_state state = 0;
bool rescan_dev = false;
for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
const int len = strlen(sdev_states[i].name);
if (strncmp(sdev_states[i].name, buf, len) == 0 &&
buf[len] == '\n') {
state = sdev_states[i].value;
break;
}
}
switch (state) {
case SDEV_RUNNING:
case SDEV_OFFLINE:
break;
default:
return -EINVAL;
}
mutex_lock(&sdev->state_mutex);
switch (sdev->sdev_state) {
case SDEV_RUNNING:
case SDEV_OFFLINE:
break;
default:
mutex_unlock(&sdev->state_mutex);
return -EINVAL;
}
if (sdev->sdev_state == SDEV_RUNNING && state == SDEV_RUNNING) {
ret = 0;
} else {
ret = scsi_device_set_state(sdev, state);
if (ret == 0 && state == SDEV_RUNNING)
rescan_dev = true;
}
mutex_unlock(&sdev->state_mutex);
if (rescan_dev) {
/*
* If the device state changes to SDEV_RUNNING, we need to
* run the queue to avoid I/O hang, and rescan the device
* to revalidate it. Running the queue first is necessary
* because another thread may be waiting inside
* blk_mq_freeze_queue_wait() and because that call may be
* waiting for pending I/O to finish.
*/
blk_mq_run_hw_queues(sdev->request_queue, true);
scsi_rescan_device(dev);
}
return ret == 0 ? count : -EINVAL;
}
static ssize_t
show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
{
struct scsi_device *sdev = to_scsi_device(dev);
const char *name = scsi_device_state_name(sdev->sdev_state);
if (!name)
return -EINVAL;
return snprintf(buf, 20, "%s\n", name);
}
static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
static ssize_t
show_queue_type_field(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct scsi_device *sdev = to_scsi_device(dev);
const char *name = "none";
if (sdev->simple_tags)
name = "simple";
return snprintf(buf, 20, "%s\n", name);
}
static ssize_t
store_queue_type_field(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct scsi_device *sdev = to_scsi_device(dev);
if (!sdev->tagged_supported)
return -EINVAL;
sdev_printk(KERN_INFO, sdev,
"ignoring write to deprecated queue_type attribute");
return count;
}
static DEVICE_ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
store_queue_type_field);
#define sdev_vpd_pg_attr(_page) \
static ssize_t \
show_vpd_##_page(struct file *filp, struct kobject *kobj, \
struct bin_attribute *bin_attr, \
char *buf, loff_t off, size_t count) \
{ \
struct device *dev = container_of(kobj, struct device, kobj); \
struct scsi_device *sdev = to_scsi_device(dev); \
struct scsi_vpd *vpd_page; \
int ret = -EINVAL; \
\
rcu_read_lock(); \
vpd_page = rcu_dereference(sdev->vpd_##_page); \
if (vpd_page) \
ret = memory_read_from_buffer(buf, count, &off, \
vpd_page->data, vpd_page->len); \
rcu_read_unlock(); \
return ret; \
} \
static struct bin_attribute dev_attr_vpd_##_page = { \
.attr = {.name = __stringify(vpd_##_page), .mode = S_IRUGO }, \
.size = 0, \
.read = show_vpd_##_page, \
};
sdev_vpd_pg_attr(pg83);
sdev_vpd_pg_attr(pg80);
static ssize_t show_inquiry(struct file *filep, struct kobject *kobj,
struct bin_attribute *bin_attr,
char *buf, loff_t off, size_t count)
{
struct device *dev = container_of(kobj, struct device, kobj);
struct scsi_device *sdev = to_scsi_device(dev);
if (!sdev->inquiry)
return -EINVAL;
return memory_read_from_buffer(buf, count, &off, sdev->inquiry,
sdev->inquiry_len);
}
static struct bin_attribute dev_attr_inquiry = {
.attr = {
.name = "inquiry",
.mode = S_IRUGO,
},
.size = 0,
.read = show_inquiry,
};
static ssize_t
show_iostat_counterbits(struct device *dev, struct device_attribute *attr,
char *buf)
{
return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
}
static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
#define show_sdev_iostat(field) \
static ssize_t \
show_iostat_##field(struct device *dev, struct device_attribute *attr, \
char *buf) \
{ \
struct scsi_device *sdev = to_scsi_device(dev); \
unsigned long long count = atomic_read(&sdev->field); \
return snprintf(buf, 20, "0x%llx\n", count); \
} \
static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
show_sdev_iostat(iorequest_cnt);
show_sdev_iostat(iodone_cnt);
show_sdev_iostat(ioerr_cnt);
static ssize_t
sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
{
struct scsi_device *sdev;
sdev = to_scsi_device(dev);
return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
}
static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
#define DECLARE_EVT_SHOW(name, Cap_name) \
static ssize_t \
sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
char *buf) \
{ \
struct scsi_device *sdev = to_scsi_device(dev); \
int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
return snprintf(buf, 20, "%d\n", val); \
}
#define DECLARE_EVT_STORE(name, Cap_name) \
static ssize_t \
sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
const char *buf, size_t count) \
{ \
struct scsi_device *sdev = to_scsi_device(dev); \
int val = simple_strtoul(buf, NULL, 0); \
if (val == 0) \
clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
else if (val == 1) \
set_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
else \
return -EINVAL; \
return count; \
}
#define DECLARE_EVT(name, Cap_name) \
DECLARE_EVT_SHOW(name, Cap_name) \
DECLARE_EVT_STORE(name, Cap_name) \
static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name, \
sdev_store_evt_##name);
#define REF_EVT(name) &dev_attr_evt_##name.attr
DECLARE_EVT(media_change, MEDIA_CHANGE)
DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED)
DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED)
DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED)
DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED)
DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED)
static ssize_t
sdev_store_queue_depth(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
int depth, retval;
struct scsi_device *sdev = to_scsi_device(dev);
struct scsi_host_template *sht = sdev->host->hostt;
if (!sht->change_queue_depth)
return -EINVAL;
depth = simple_strtoul(buf, NULL, 0);
if (depth < 1 || depth > sdev->host->can_queue)
return -EINVAL;
retval = sht->change_queue_depth(sdev, depth);
if (retval < 0)
return retval;
sdev->max_queue_depth = sdev->queue_depth;
return count;
}
sdev_show_function(queue_depth, "%d\n");
static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
sdev_store_queue_depth);
static ssize_t
sdev_show_wwid(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct scsi_device *sdev = to_scsi_device(dev);
ssize_t count;
count = scsi_vpd_lun_id(sdev, buf, PAGE_SIZE);
if (count > 0) {
buf[count] = '\n';
count++;
}
return count;
}
static DEVICE_ATTR(wwid, S_IRUGO, sdev_show_wwid, NULL);
#define BLIST_FLAG_NAME(name) \
[const_ilog2((__force __u64)BLIST_##name)] = #name
static const char *const sdev_bflags_name[] = {
#include "scsi_devinfo_tbl.c"
};
#undef BLIST_FLAG_NAME
static ssize_t
sdev_show_blacklist(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct scsi_device *sdev = to_scsi_device(dev);
int i;
ssize_t len = 0;
for (i = 0; i < sizeof(sdev->sdev_bflags) * BITS_PER_BYTE; i++) {
const char *name = NULL;
if (!(sdev->sdev_bflags & (__force blist_flags_t)BIT(i)))
continue;
if (i < ARRAY_SIZE(sdev_bflags_name) && sdev_bflags_name[i])
name = sdev_bflags_name[i];
if (name)
len += snprintf(buf + len, PAGE_SIZE - len,
"%s%s", len ? " " : "", name);
else
len += snprintf(buf + len, PAGE_SIZE - len,
"%sINVALID_BIT(%d)", len ? " " : "", i);
}
if (len)
len += snprintf(buf + len, PAGE_SIZE - len, "\n");
return len;
}
static DEVICE_ATTR(blacklist, S_IRUGO, sdev_show_blacklist, NULL);
#ifdef CONFIG_SCSI_DH
static ssize_t
sdev_show_dh_state(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct scsi_device *sdev = to_scsi_device(dev);
if (!sdev->handler)
return snprintf(buf, 20, "detached\n");
return snprintf(buf, 20, "%s\n", sdev->handler->name);
}
static ssize_t
sdev_store_dh_state(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct scsi_device *sdev = to_scsi_device(dev);
int err = -EINVAL;
if (sdev->sdev_state == SDEV_CANCEL ||
sdev->sdev_state == SDEV_DEL)
return -ENODEV;
if (!sdev->handler) {
/*
* Attach to a device handler
*/
err = scsi_dh_attach(sdev->request_queue, buf);
} else if (!strncmp(buf, "activate", 8)) {
/*
* Activate a device handler
*/
if (sdev->handler->activate)
err = sdev->handler->activate(sdev, NULL, NULL);
else
err = 0;
} else if (!strncmp(buf, "detach", 6)) {
/*
* Detach from a device handler
*/
sdev_printk(KERN_WARNING, sdev,
"can't detach handler %s.\n",
sdev->handler->name);
err = -EINVAL;
}
return err < 0 ? err : count;
}
static DEVICE_ATTR(dh_state, S_IRUGO | S_IWUSR, sdev_show_dh_state,
sdev_store_dh_state);
static ssize_t
sdev_show_access_state(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct scsi_device *sdev = to_scsi_device(dev);
unsigned char access_state;
const char *access_state_name;
if (!sdev->handler)
return -EINVAL;
access_state = (sdev->access_state & SCSI_ACCESS_STATE_MASK);
access_state_name = scsi_access_state_name(access_state);
return sprintf(buf, "%s\n",
access_state_name ? access_state_name : "unknown");
}
static DEVICE_ATTR(access_state, S_IRUGO, sdev_show_access_state, NULL);
static ssize_t
sdev_show_preferred_path(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct scsi_device *sdev = to_scsi_device(dev);
if (!sdev->handler)
return -EINVAL;
if (sdev->access_state & SCSI_ACCESS_STATE_PREFERRED)
return sprintf(buf, "1\n");
else
return sprintf(buf, "0\n");
}
static DEVICE_ATTR(preferred_path, S_IRUGO, sdev_show_preferred_path, NULL);
#endif
static ssize_t
sdev_show_queue_ramp_up_period(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct scsi_device *sdev;
sdev = to_scsi_device(dev);
return snprintf(buf, 20, "%u\n",
jiffies_to_msecs(sdev->queue_ramp_up_period));
}
static ssize_t
sdev_store_queue_ramp_up_period(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct scsi_device *sdev = to_scsi_device(dev);
unsigned int period;
if (kstrtouint(buf, 10, &period))
return -EINVAL;
sdev->queue_ramp_up_period = msecs_to_jiffies(period);
return count;
}
static DEVICE_ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
sdev_show_queue_ramp_up_period,
sdev_store_queue_ramp_up_period);
static umode_t scsi_sdev_attr_is_visible(struct kobject *kobj,
struct attribute *attr, int i)
{
struct device *dev = container_of(kobj, struct device, kobj);
struct scsi_device *sdev = to_scsi_device(dev);
if (attr == &dev_attr_queue_depth.attr &&
!sdev->host->hostt->change_queue_depth)
return S_IRUGO;
if (attr == &dev_attr_queue_ramp_up_period.attr &&
!sdev->host->hostt->change_queue_depth)
return 0;
#ifdef CONFIG_SCSI_DH
if (attr == &dev_attr_access_state.attr &&
!sdev->handler)
return 0;
if (attr == &dev_attr_preferred_path.attr &&
!sdev->handler)
return 0;
#endif
return attr->mode;
}
static umode_t scsi_sdev_bin_attr_is_visible(struct kobject *kobj,
struct bin_attribute *attr, int i)
{
struct device *dev = container_of(kobj, struct device, kobj);
struct scsi_device *sdev = to_scsi_device(dev);
if (attr == &dev_attr_vpd_pg80 && !sdev->vpd_pg80)
return 0;
if (attr == &dev_attr_vpd_pg83 && !sdev->vpd_pg83)
return 0;
return S_IRUGO;
}
/* Default template for device attributes. May NOT be modified */
static struct attribute *scsi_sdev_attrs[] = {
&dev_attr_device_blocked.attr,
&dev_attr_type.attr,
&dev_attr_scsi_level.attr,
&dev_attr_device_busy.attr,
&dev_attr_vendor.attr,
&dev_attr_model.attr,
&dev_attr_rev.attr,
&dev_attr_rescan.attr,
&dev_attr_delete.attr,
&dev_attr_state.attr,
&dev_attr_timeout.attr,
&dev_attr_eh_timeout.attr,
&dev_attr_iocounterbits.attr,
&dev_attr_iorequest_cnt.attr,
&dev_attr_iodone_cnt.attr,
&dev_attr_ioerr_cnt.attr,
&dev_attr_modalias.attr,
&dev_attr_queue_depth.attr,
&dev_attr_queue_type.attr,
&dev_attr_wwid.attr,
&dev_attr_blacklist.attr,
#ifdef CONFIG_SCSI_DH
&dev_attr_dh_state.attr,
&dev_attr_access_state.attr,
&dev_attr_preferred_path.attr,
#endif
&dev_attr_queue_ramp_up_period.attr,
REF_EVT(media_change),
REF_EVT(inquiry_change_reported),
REF_EVT(capacity_change_reported),
REF_EVT(soft_threshold_reached),
REF_EVT(mode_parameter_change_reported),
REF_EVT(lun_change_reported),
NULL
};
static struct bin_attribute *scsi_sdev_bin_attrs[] = {
&dev_attr_vpd_pg83,
&dev_attr_vpd_pg80,
&dev_attr_inquiry,
NULL
};
static struct attribute_group scsi_sdev_attr_group = {
.attrs = scsi_sdev_attrs,
.bin_attrs = scsi_sdev_bin_attrs,
.is_visible = scsi_sdev_attr_is_visible,
.is_bin_visible = scsi_sdev_bin_attr_is_visible,
};
static const struct attribute_group *scsi_sdev_attr_groups[] = {
&scsi_sdev_attr_group,
NULL
};
static int scsi_target_add(struct scsi_target *starget)
{
int error;
if (starget->state != STARGET_CREATED)
return 0;
error = device_add(&starget->dev);
if (error) {
dev_err(&starget->dev, "target device_add failed, error %d\n", error);
return error;
}
transport_add_device(&starget->dev);
starget->state = STARGET_RUNNING;
pm_runtime_set_active(&starget->dev);
pm_runtime_enable(&starget->dev);
device_enable_async_suspend(&starget->dev);
return 0;
}
/**
* scsi_sysfs_add_sdev - add scsi device to sysfs
* @sdev: scsi_device to add
*
* Return value:
* 0 on Success / non-zero on Failure
**/
int scsi_sysfs_add_sdev(struct scsi_device *sdev)
{
int error, i;
struct request_queue *rq = sdev->request_queue;
struct scsi_target *starget = sdev->sdev_target;
error = scsi_target_add(starget);
if (error)
return error;
transport_configure_device(&starget->dev);
device_enable_async_suspend(&sdev->sdev_gendev);
scsi_autopm_get_target(starget);
pm_runtime_set_active(&sdev->sdev_gendev);
pm_runtime_forbid(&sdev->sdev_gendev);
pm_runtime_enable(&sdev->sdev_gendev);
scsi_autopm_put_target(starget);
scsi_autopm_get_device(sdev);
scsi_dh_add_device(sdev);
error = device_add(&sdev->sdev_gendev);
if (error) {
sdev_printk(KERN_INFO, sdev,
"failed to add device: %d\n", error);
return error;
}
device_enable_async_suspend(&sdev->sdev_dev);
error = device_add(&sdev->sdev_dev);
if (error) {
sdev_printk(KERN_INFO, sdev,
"failed to add class device: %d\n", error);
device_del(&sdev->sdev_gendev);
return error;
}
transport_add_device(&sdev->sdev_gendev);
sdev->is_visible = 1;
error = bsg_scsi_register_queue(rq, &sdev->sdev_gendev);
if (error)
/* we're treating error on bsg register as non-fatal,
* so pretend nothing went wrong */
sdev_printk(KERN_INFO, sdev,
"Failed to register bsg queue, errno=%d\n", error);
/* add additional host specific attributes */
if (sdev->host->hostt->sdev_attrs) {
for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
error = device_create_file(&sdev->sdev_gendev,
sdev->host->hostt->sdev_attrs[i]);
if (error)
return error;
}
}
if (sdev->host->hostt->sdev_groups) {
error = sysfs_create_groups(&sdev->sdev_gendev.kobj,
sdev->host->hostt->sdev_groups);
if (error)
return error;
}
scsi_autopm_put_device(sdev);
return error;
}
void __scsi_remove_device(struct scsi_device *sdev)
{
struct device *dev = &sdev->sdev_gendev;
int res;
/*
* This cleanup path is not reentrant and while it is impossible
* to get a new reference with scsi_device_get() someone can still
* hold a previously acquired one.
*/
if (sdev->sdev_state == SDEV_DEL)
return;
if (sdev->is_visible) {
/*
* If scsi_internal_target_block() is running concurrently,
* wait until it has finished before changing the device state.
*/
mutex_lock(&sdev->state_mutex);
/*
* If blocked, we go straight to DEL and restart the queue so
* any commands issued during driver shutdown (like sync
* cache) are errored immediately.
*/
res = scsi_device_set_state(sdev, SDEV_CANCEL);
if (res != 0) {
res = scsi_device_set_state(sdev, SDEV_DEL);
if (res == 0)
scsi_start_queue(sdev);
}
mutex_unlock(&sdev->state_mutex);
if (res != 0)
return;
if (sdev->host->hostt->sdev_groups)
sysfs_remove_groups(&sdev->sdev_gendev.kobj,
sdev->host->hostt->sdev_groups);
bsg_unregister_queue(sdev->request_queue);
device_unregister(&sdev->sdev_dev);
transport_remove_device(dev);
device_del(dev);
} else
put_device(&sdev->sdev_dev);
/*
* Stop accepting new requests and wait until all queuecommand() and
* scsi_run_queue() invocations have finished before tearing down the
* device.
*/
mutex_lock(&sdev->state_mutex);
scsi_device_set_state(sdev, SDEV_DEL);
mutex_unlock(&sdev->state_mutex);
blk_cleanup_queue(sdev->request_queue);
cancel_work_sync(&sdev->requeue_work);
if (sdev->host->hostt->slave_destroy)
sdev->host->hostt->slave_destroy(sdev);
transport_destroy_device(dev);
/*
* Paired with the kref_get() in scsi_sysfs_initialize(). We have
* remoed sysfs visibility from the device, so make the target
* invisible if this was the last device underneath it.
*/
scsi_target_reap(scsi_target(sdev));
put_device(dev);
}
/**
* scsi_remove_device - unregister a device from the scsi bus
* @sdev: scsi_device to unregister
**/
void scsi_remove_device(struct scsi_device *sdev)
{
struct Scsi_Host *shost = sdev->host;
mutex_lock(&shost->scan_mutex);
__scsi_remove_device(sdev);
mutex_unlock(&shost->scan_mutex);
}
EXPORT_SYMBOL(scsi_remove_device);
static void __scsi_remove_target(struct scsi_target *starget)
{
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
unsigned long flags;
struct scsi_device *sdev;
spin_lock_irqsave(shost->host_lock, flags);
restart:
list_for_each_entry(sdev, &shost->__devices, siblings) {
/*
* We cannot call scsi_device_get() here, as
* we might've been called from rmmod() causing
* scsi_device_get() to fail the module_is_live()
* check.
*/
if (sdev->channel != starget->channel ||
sdev->id != starget->id)
continue;
if (sdev->sdev_state == SDEV_DEL ||
sdev->sdev_state == SDEV_CANCEL ||
!get_device(&sdev->sdev_gendev))
continue;
spin_unlock_irqrestore(shost->host_lock, flags);
scsi_remove_device(sdev);
put_device(&sdev->sdev_gendev);
spin_lock_irqsave(shost->host_lock, flags);
goto restart;
}
spin_unlock_irqrestore(shost->host_lock, flags);
}
/**
* scsi_remove_target - try to remove a target and all its devices
* @dev: generic starget or parent of generic stargets to be removed
*
* Note: This is slightly racy. It is possible that if the user
* requests the addition of another device then the target won't be
* removed.
*/
void scsi_remove_target(struct device *dev)
{
struct Scsi_Host *shost = dev_to_shost(dev->parent);
struct scsi_target *starget;
unsigned long flags;
restart:
spin_lock_irqsave(shost->host_lock, flags);
list_for_each_entry(starget, &shost->__targets, siblings) {
if (starget->state == STARGET_DEL ||
starget->state == STARGET_REMOVE ||
starget->state == STARGET_CREATED_REMOVE)
continue;
if (starget->dev.parent == dev || &starget->dev == dev) {
kref_get(&starget->reap_ref);
if (starget->state == STARGET_CREATED)
starget->state = STARGET_CREATED_REMOVE;
else
starget->state = STARGET_REMOVE;
spin_unlock_irqrestore(shost->host_lock, flags);
__scsi_remove_target(starget);
scsi_target_reap(starget);
goto restart;
}
}
spin_unlock_irqrestore(shost->host_lock, flags);
}
EXPORT_SYMBOL(scsi_remove_target);
int scsi_register_driver(struct device_driver *drv)
{
drv->bus = &scsi_bus_type;
return driver_register(drv);
}
EXPORT_SYMBOL(scsi_register_driver);
int scsi_register_interface(struct class_interface *intf)
{
intf->class = &sdev_class;
return class_interface_register(intf);
}
EXPORT_SYMBOL(scsi_register_interface);
/**
* scsi_sysfs_add_host - add scsi host to subsystem
* @shost: scsi host struct to add to subsystem
**/
int scsi_sysfs_add_host(struct Scsi_Host *shost)
{
int error, i;
/* add host specific attributes */
if (shost->hostt->shost_attrs) {
for (i = 0; shost->hostt->shost_attrs[i]; i++) {
error = device_create_file(&shost->shost_dev,
shost->hostt->shost_attrs[i]);
if (error)
return error;
}
}
transport_register_device(&shost->shost_gendev);
transport_configure_device(&shost->shost_gendev);
return 0;
}
static struct device_type scsi_dev_type = {
.name = "scsi_device",
.release = scsi_device_dev_release,
.groups = scsi_sdev_attr_groups,
};
void scsi_sysfs_device_initialize(struct scsi_device *sdev)
{
unsigned long flags;
struct Scsi_Host *shost = sdev->host;
struct scsi_target *starget = sdev->sdev_target;
device_initialize(&sdev->sdev_gendev);
sdev->sdev_gendev.bus = &scsi_bus_type;
sdev->sdev_gendev.type = &scsi_dev_type;
dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%llu",
sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
device_initialize(&sdev->sdev_dev);
sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
sdev->sdev_dev.class = &sdev_class;
dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%llu",
sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
/*
* Get a default scsi_level from the target (derived from sibling
* devices). This is the best we can do for guessing how to set
* sdev->lun_in_cdb for the initial INQUIRY command. For LUN 0 the
* setting doesn't matter, because all the bits are zero anyway.
* But it does matter for higher LUNs.
*/
sdev->scsi_level = starget->scsi_level;
if (sdev->scsi_level <= SCSI_2 &&
sdev->scsi_level != SCSI_UNKNOWN &&
!shost->no_scsi2_lun_in_cdb)
sdev->lun_in_cdb = 1;
transport_setup_device(&sdev->sdev_gendev);
spin_lock_irqsave(shost->host_lock, flags);
list_add_tail(&sdev->same_target_siblings, &starget->devices);
list_add_tail(&sdev->siblings, &shost->__devices);
spin_unlock_irqrestore(shost->host_lock, flags);
/*
* device can now only be removed via __scsi_remove_device() so hold
* the target. Target will be held in CREATED state until something
* beneath it becomes visible (in which case it moves to RUNNING)
*/
kref_get(&starget->reap_ref);
}
int scsi_is_sdev_device(const struct device *dev)
{
return dev->type == &scsi_dev_type;
}
EXPORT_SYMBOL(scsi_is_sdev_device);
/* A blank transport template that is used in drivers that don't
* yet implement Transport Attributes */
struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };
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