Initial import

1 files changed, 1275 insertions, 0 deletions

diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
new file mode 100644
index 000000000..1ac38e73d
--- /dev/null
+++ b/drivers/scsi/scsi_sysfs.c
@@ -0,0 +1,1275 @@
+/*
+ * 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_transport.h>
+#include <scsi/scsi_driver.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;
+}
+
+static int check_set(unsigned long long *val, char *src)
+{
+	char *last;
+
+	if (strncmp(src, "-", 20) == 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, 1);
+	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 */
+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);
+
+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", atomic_read(&shost->host_busy));
+}
+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
+};
+
+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;
+	unsigned long flags;
+
+	sdev = container_of(work, struct scsi_device, ew.work);
+
+	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;
+
+	kfree(sdev->vpd_pg83);
+	kfree(sdev->vpd_pg80);
+	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)
+{
+	if (device_remove_file_self(dev, attr))
+		scsi_remove_device(to_scsi_device(dev));
+	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;
+	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;
+
+	if (scsi_device_set_state(sdev, state))
+		return -EINVAL;
+	return count;
+}
+
+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);			\
+	if (!sdev->vpd_##_page)						\
+		return -EINVAL;						\
+	return memory_read_from_buffer(buf, count, &off,		\
+				       sdev->vpd_##_page,		\
+				       sdev->vpd_##_page##_len);	\
+}									\
+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_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 > sht->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_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 period;
+}
+
+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;
+
+	return attr->mode;
+}
+
+/* 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_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,
+	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,
+};
+
+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_device_set_state(sdev, SDEV_RUNNING);
+	if (error)
+		return error;
+
+	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);
+
+	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_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
+
+	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;
+		}
+	}
+
+	scsi_autopm_put_device(sdev);
+	return error;
+}
+
+void __scsi_remove_device(struct scsi_device *sdev)
+{
+	struct device *dev = &sdev->sdev_gendev;
+
+	if (sdev->is_visible) {
+		if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
+			return;
+
+		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.
+	 */
+	scsi_device_set_state(sdev, SDEV_DEL);
+	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) {
+		if (sdev->channel != starget->channel ||
+		    sdev->id != starget->id ||
+		    scsi_device_get(sdev))
+			continue;
+		spin_unlock_irqrestore(shost->host_lock, flags);
+		scsi_remove_device(sdev);
+		scsi_device_put(sdev);
+		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, *last = NULL;
+	unsigned long flags;
+
+	/* remove targets being careful to lookup next entry before
+	 * deleting the last
+	 */
+	spin_lock_irqsave(shost->host_lock, flags);
+	list_for_each_entry(starget, &shost->__targets, siblings) {
+		if (starget->state == STARGET_DEL)
+			continue;
+		if (starget->dev.parent == dev || &starget->dev == dev) {
+			/* assuming new targets arrive at the end */
+			kref_get(&starget->reap_ref);
+			spin_unlock_irqrestore(shost->host_lock, flags);
+			if (last)
+				scsi_target_reap(last);
+			last = starget;
+			__scsi_remove_target(starget);
+			spin_lock_irqsave(shost->host_lock, flags);
+		}
+	}
+	spin_unlock_irqrestore(shost->host_lock, flags);
+
+	if (last)
+		scsi_target_reap(last);
+}
+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, }, }, }, };