v4.19.13 snapshot.
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
new file mode 100644
index 0000000..3aee946
--- /dev/null
+++ b/drivers/scsi/scsi_sysfs.c
@@ -0,0 +1,1589 @@
+/*
+ * 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(use_blk_mq, "%d\n");
+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 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;
+
+ sdev = container_of(work, struct scsi_device, ew.work);
+
+ 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);
+}
+
+static void scsi_device_dev_release(struct device *dev)
+{
+ struct scsi_device *sdp = to_scsi_device(dev);
+ 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;
+
+ 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(to_scsi_device(dev));
+ if (kn)
+ sysfs_unbreak_active_protection(kn);
+ 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;
+
+ 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;
+ }
+ }
+ if (!state)
+ return -EINVAL;
+
+ mutex_lock(&sdev->state_mutex);
+ ret = scsi_device_set_state(sdev, state);
+ mutex_unlock(&sdev->state_mutex);
+
+ 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, }, }, }, };