/* * scsi_sysfs.c * * SCSI sysfs interface routines. * * Created to pull SCSI mid layer sysfs routines into one file. */ #include <linux/config.h> #include <linux/module.h> #include <linux/init.h> #include <linux/blkdev.h> #include <linux/device.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_priv.h" #include "scsi_logging.h" 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_BLOCK, "blocked" }, }; const char *scsi_device_state_name(enum scsi_device_state state) { int i; char *name = NULL; for (i = 0; i < sizeof(sdev_states)/sizeof(sdev_states[0]); 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 < sizeof(shost_states)/sizeof(shost_states[0]); i++) { if (shost_states[i].value == state) { name = shost_states[i].name; break; } } return name; } static int check_set(unsigned int *val, char *src) { char *last; if (strncmp(src, "-", 20) == 0) { *val = SCAN_WILD_CARD; } else { /* * Doesn't check for int overflow */ *val = simple_strtoul(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[15], junk; unsigned int channel, id, lun; int res; res = sscanf(str, "%10s %10s %10s %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 class_device *class_dev, char *buf) \ { \ struct Scsi_Host *shost = class_to_shost(class_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 CLASS_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 class_device *class_dev, const char *buf, size_t count) { struct Scsi_Host *shost = class_to_shost(class_dev); int res; res = scsi_scan(shost, buf); if (res == 0) res = count; return res; }; static CLASS_DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan); static ssize_t store_shost_state(struct class_device *class_dev, const char *buf, size_t count) { int i; struct Scsi_Host *shost = class_to_shost(class_dev); enum scsi_host_state state = 0; for (i = 0; i < sizeof(shost_states)/sizeof(shost_states[0]); 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 class_device *class_dev, char *buf) { struct Scsi_Host *shost = class_to_shost(class_dev); const char *name = scsi_host_state_name(shost->shost_state); if (!name) return -EINVAL; return snprintf(buf, 20, "%s\n", name); } static CLASS_DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state); shost_rd_attr(unique_id, "%u\n"); shost_rd_attr(host_busy, "%hu\n"); shost_rd_attr(cmd_per_lun, "%hd\n"); shost_rd_attr(sg_tablesize, "%hu\n"); shost_rd_attr(unchecked_isa_dma, "%d\n"); shost_rd_attr2(proc_name, hostt->proc_name, "%s\n"); static struct class_device_attribute *scsi_sysfs_shost_attrs[] = { &class_device_attr_unique_id, &class_device_attr_host_busy, &class_device_attr_cmd_per_lun, &class_device_attr_sg_tablesize, &class_device_attr_unchecked_isa_dma, &class_device_attr_proc_name, &class_device_attr_scan, &class_device_attr_state, NULL }; static void scsi_device_cls_release(struct class_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(void *data) { struct device *dev = data; struct scsi_device *sdev; struct device *parent; struct scsi_target *starget; unsigned long flags; parent = dev->parent; sdev = to_scsi_device(dev); starget = to_scsi_target(parent); spin_lock_irqsave(sdev->host->host_lock, flags); starget->reap_ref++; list_del(&sdev->siblings); list_del(&sdev->same_target_siblings); list_del(&sdev->starved_entry); spin_unlock_irqrestore(sdev->host->host_lock, flags); if (sdev->request_queue) { sdev->request_queue->queuedata = NULL; /* user context needed to free queue */ scsi_free_queue(sdev->request_queue); /* temporary expedient, try to catch use of queue lock * after free of sdev */ sdev->request_queue = NULL; } scsi_target_reap(scsi_target(sdev)); kfree(sdev->inquiry); kfree(sdev); if (parent) put_device(parent); } static void scsi_device_dev_release(struct device *dev) { scsi_execute_in_process_context(scsi_device_dev_release_usercontext, dev); } static struct class sdev_class = { .name = "scsi_device", .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 = 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_suspend(struct device * dev, pm_message_t state) { struct scsi_device *sdev = to_scsi_device(dev); struct scsi_host_template *sht = sdev->host->hostt; int err; err = scsi_device_quiesce(sdev); if (err) return err; if (sht->suspend) err = sht->suspend(sdev); return err; } static int scsi_bus_resume(struct device * dev) { struct scsi_device *sdev = to_scsi_device(dev); struct scsi_host_template *sht = sdev->host->hostt; int err = 0; if (sht->resume) err = sht->resume(sdev); scsi_device_resume(sdev); return err; } struct bus_type scsi_bus_type = { .name = "scsi", .match = scsi_bus_match, .suspend = scsi_bus_suspend, .resume = scsi_bus_resume, }; 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_rd_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); \ snscanf (buf, 20, 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 (device_blocked, "%d\n"); sdev_rd_attr (queue_depth, "%d\n"); 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_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->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); sdev->timeout = timeout * HZ; return count; } static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_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) { 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 < sizeof(sdev_states)/sizeof(sdev_states[0]); 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->ordered_tags) name = "ordered"; else if (sdev->simple_tags) name = "simple"; return snprintf(buf, 20, "%s\n", name); } static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL); 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); /* Default template for device attributes. May NOT be modified */ static struct device_attribute *scsi_sysfs_sdev_attrs[] = { &dev_attr_device_blocked, &dev_attr_queue_depth, &dev_attr_queue_type, &dev_attr_type, &dev_attr_scsi_level, &dev_attr_vendor, &dev_attr_model, &dev_attr_rev, &dev_attr_rescan, &dev_attr_delete, &dev_attr_state, &dev_attr_timeout, &dev_attr_iocounterbits, &dev_attr_iorequest_cnt, &dev_attr_iodone_cnt, &dev_attr_ioerr_cnt, NULL }; static ssize_t sdev_store_queue_depth_rw(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) return -EINVAL; retval = sht->change_queue_depth(sdev, depth); if (retval < 0) return retval; return count; } static struct device_attribute sdev_attr_queue_depth_rw = __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth, sdev_store_queue_depth_rw); static ssize_t sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct scsi_device *sdev = to_scsi_device(dev); struct scsi_host_template *sht = sdev->host->hostt; int tag_type = 0, retval; int prev_tag_type = scsi_get_tag_type(sdev); if (!sdev->tagged_supported || !sht->change_queue_type) return -EINVAL; if (strncmp(buf, "ordered", 7) == 0) tag_type = MSG_ORDERED_TAG; else if (strncmp(buf, "simple", 6) == 0) tag_type = MSG_SIMPLE_TAG; else if (strncmp(buf, "none", 4) != 0) return -EINVAL; if (tag_type == prev_tag_type) return count; retval = sht->change_queue_type(sdev, tag_type); if (retval < 0) return retval; return count; } static struct device_attribute sdev_attr_queue_type_rw = __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field, sdev_store_queue_type_rw); static struct device_attribute *attr_changed_internally( struct Scsi_Host *shost, struct device_attribute * attr) { if (!strcmp("queue_depth", attr->attr.name) && shost->hostt->change_queue_depth) return &sdev_attr_queue_depth_rw; else if (!strcmp("queue_type", attr->attr.name) && shost->hostt->change_queue_type) return &sdev_attr_queue_type_rw; return attr; } static struct device_attribute *attr_overridden( struct device_attribute **attrs, struct device_attribute *attr) { int i; if (!attrs) return NULL; for (i = 0; attrs[i]; i++) if (!strcmp(attrs[i]->attr.name, attr->attr.name)) return attrs[i]; return NULL; } static int attr_add(struct device *dev, struct device_attribute *attr) { struct device_attribute *base_attr; /* * Spare the caller from having to copy things it's not interested in. */ base_attr = attr_overridden(scsi_sysfs_sdev_attrs, attr); if (base_attr) { /* extend permissions */ attr->attr.mode |= base_attr->attr.mode; /* override null show/store with default */ if (!attr->show) attr->show = base_attr->show; if (!attr->store) attr->store = base_attr->store; } return device_create_file(dev, attr); } /** * 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; if ((error = scsi_device_set_state(sdev, SDEV_RUNNING)) != 0) return error; error = device_add(&sdev->sdev_gendev); if (error) { put_device(sdev->sdev_gendev.parent); printk(KERN_INFO "error 1\n"); return error; } error = class_device_add(&sdev->sdev_classdev); if (error) { printk(KERN_INFO "error 2\n"); goto clean_device; } /* take a reference for the sdev_classdev; this is * released by the sdev_class .release */ get_device(&sdev->sdev_gendev); if (sdev->host->hostt->sdev_attrs) { for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) { error = attr_add(&sdev->sdev_gendev, sdev->host->hostt->sdev_attrs[i]); if (error) { __scsi_remove_device(sdev); goto out; } } } for (i = 0; scsi_sysfs_sdev_attrs[i]; i++) { if (!attr_overridden(sdev->host->hostt->sdev_attrs, scsi_sysfs_sdev_attrs[i])) { struct device_attribute * attr = attr_changed_internally(sdev->host, scsi_sysfs_sdev_attrs[i]); error = device_create_file(&sdev->sdev_gendev, attr); if (error) { __scsi_remove_device(sdev); goto out; } } } transport_add_device(&sdev->sdev_gendev); out: return error; clean_device: scsi_device_set_state(sdev, SDEV_CANCEL); device_del(&sdev->sdev_gendev); transport_destroy_device(&sdev->sdev_gendev); put_device(&sdev->sdev_gendev); return error; } void __scsi_remove_device(struct scsi_device *sdev) { struct device *dev = &sdev->sdev_gendev; if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0) return; class_device_unregister(&sdev->sdev_classdev); transport_remove_device(dev); device_del(dev); scsi_device_set_state(sdev, SDEV_DEL); if (sdev->host->hostt->slave_destroy) sdev->host->hostt->slave_destroy(sdev); transport_destroy_device(dev); 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); 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); starget->reap_ref++; restart: list_for_each_entry(sdev, &shost->__devices, siblings) { if (sdev->channel != starget->channel || sdev->id != starget->id || sdev->sdev_state == SDEV_DEL) continue; spin_unlock_irqrestore(shost->host_lock, flags); scsi_remove_device(sdev); spin_lock_irqsave(shost->host_lock, flags); goto restart; } spin_unlock_irqrestore(shost->host_lock, flags); scsi_target_reap(starget); } static int __remove_child (struct device * dev, void * data) { if (scsi_is_target_device(dev)) __scsi_remove_target(to_scsi_target(dev)); return 0; } /** * 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 device *rdev; if (scsi_is_target_device(dev)) { __scsi_remove_target(to_scsi_target(dev)); return; } rdev = get_device(dev); device_for_each_child(dev, NULL, __remove_child); put_device(rdev); } 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); static struct class_device_attribute *class_attr_overridden( struct class_device_attribute **attrs, struct class_device_attribute *attr) { int i; if (!attrs) return NULL; for (i = 0; attrs[i]; i++) if (!strcmp(attrs[i]->attr.name, attr->attr.name)) return attrs[i]; return NULL; } static int class_attr_add(struct class_device *classdev, struct class_device_attribute *attr) { struct class_device_attribute *base_attr; /* * Spare the caller from having to copy things it's not interested in. */ base_attr = class_attr_overridden(scsi_sysfs_shost_attrs, attr); if (base_attr) { /* extend permissions */ attr->attr.mode |= base_attr->attr.mode; /* override null show/store with default */ if (!attr->show) attr->show = base_attr->show; if (!attr->store) attr->store = base_attr->store; } return class_device_create_file(classdev, attr); } /** * scsi_sysfs_add_host - add scsi host to subsystem * @shost: scsi host struct to add to subsystem * @dev: parent struct device pointer **/ int scsi_sysfs_add_host(struct Scsi_Host *shost) { int error, i; if (shost->hostt->shost_attrs) { for (i = 0; shost->hostt->shost_attrs[i]; i++) { error = class_attr_add(&shost->shost_classdev, shost->hostt->shost_attrs[i]); if (error) return error; } } for (i = 0; scsi_sysfs_shost_attrs[i]; i++) { if (!class_attr_overridden(shost->hostt->shost_attrs, scsi_sysfs_shost_attrs[i])) { error = class_device_create_file(&shost->shost_classdev, scsi_sysfs_shost_attrs[i]); if (error) return error; } } transport_register_device(&shost->shost_gendev); return 0; } 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.release = scsi_device_dev_release; sprintf(sdev->sdev_gendev.bus_id,"%d:%d:%d:%d", sdev->host->host_no, sdev->channel, sdev->id, sdev->lun); class_device_initialize(&sdev->sdev_classdev); sdev->sdev_classdev.dev = &sdev->sdev_gendev; sdev->sdev_classdev.class = &sdev_class; snprintf(sdev->sdev_classdev.class_id, BUS_ID_SIZE, "%d:%d:%d:%d", sdev->host->host_no, sdev->channel, sdev->id, sdev->lun); sdev->scsi_level = SCSI_2; 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); } int scsi_is_sdev_device(const struct device *dev) { return dev->release == scsi_device_dev_release; } 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, }, }, }, };