161a7afa2SJames Bottomley /* 261a7afa2SJames Bottomley * RAID Attributes 361a7afa2SJames Bottomley */ 461a7afa2SJames Bottomley #include <linux/init.h> 561a7afa2SJames Bottomley #include <linux/module.h> 661a7afa2SJames Bottomley #include <linux/list.h> 761a7afa2SJames Bottomley #include <linux/raid_class.h> 861a7afa2SJames Bottomley #include <scsi/scsi_device.h> 961a7afa2SJames Bottomley #include <scsi/scsi_host.h> 1061a7afa2SJames Bottomley 1161a7afa2SJames Bottomley #define RAID_NUM_ATTRS 3 1261a7afa2SJames Bottomley 1361a7afa2SJames Bottomley struct raid_internal { 1461a7afa2SJames Bottomley struct raid_template r; 1561a7afa2SJames Bottomley struct raid_function_template *f; 1661a7afa2SJames Bottomley /* The actual attributes */ 1761a7afa2SJames Bottomley struct class_device_attribute private_attrs[RAID_NUM_ATTRS]; 1861a7afa2SJames Bottomley /* The array of null terminated pointers to attributes 1961a7afa2SJames Bottomley * needed by scsi_sysfs.c */ 2061a7afa2SJames Bottomley struct class_device_attribute *attrs[RAID_NUM_ATTRS + 1]; 2161a7afa2SJames Bottomley }; 2261a7afa2SJames Bottomley 2361a7afa2SJames Bottomley struct raid_component { 2461a7afa2SJames Bottomley struct list_head node; 2561a7afa2SJames Bottomley struct device *dev; 2661a7afa2SJames Bottomley int num; 2761a7afa2SJames Bottomley }; 2861a7afa2SJames Bottomley 2961a7afa2SJames Bottomley #define to_raid_internal(tmpl) container_of(tmpl, struct raid_internal, r) 3061a7afa2SJames Bottomley 3161a7afa2SJames Bottomley #define tc_to_raid_internal(tcont) ({ \ 3261a7afa2SJames Bottomley struct raid_template *r = \ 3361a7afa2SJames Bottomley container_of(tcont, struct raid_template, raid_attrs); \ 3461a7afa2SJames Bottomley to_raid_internal(r); \ 3561a7afa2SJames Bottomley }) 3661a7afa2SJames Bottomley 3761a7afa2SJames Bottomley #define ac_to_raid_internal(acont) ({ \ 3861a7afa2SJames Bottomley struct transport_container *tc = \ 3961a7afa2SJames Bottomley container_of(acont, struct transport_container, ac); \ 4061a7afa2SJames Bottomley tc_to_raid_internal(tc); \ 4161a7afa2SJames Bottomley }) 4261a7afa2SJames Bottomley 4361a7afa2SJames Bottomley #define class_device_to_raid_internal(cdev) ({ \ 4461a7afa2SJames Bottomley struct attribute_container *ac = \ 4561a7afa2SJames Bottomley attribute_container_classdev_to_container(cdev); \ 4661a7afa2SJames Bottomley ac_to_raid_internal(ac); \ 4761a7afa2SJames Bottomley }) 4861a7afa2SJames Bottomley 4961a7afa2SJames Bottomley 5061a7afa2SJames Bottomley static int raid_match(struct attribute_container *cont, struct device *dev) 5161a7afa2SJames Bottomley { 5261a7afa2SJames Bottomley /* We have to look for every subsystem that could house 5361a7afa2SJames Bottomley * emulated RAID devices, so start with SCSI */ 5461a7afa2SJames Bottomley struct raid_internal *i = ac_to_raid_internal(cont); 5561a7afa2SJames Bottomley 5661a7afa2SJames Bottomley if (scsi_is_sdev_device(dev)) { 5761a7afa2SJames Bottomley struct scsi_device *sdev = to_scsi_device(dev); 5861a7afa2SJames Bottomley 5961a7afa2SJames Bottomley if (i->f->cookie != sdev->host->hostt) 6061a7afa2SJames Bottomley return 0; 6161a7afa2SJames Bottomley 6261a7afa2SJames Bottomley return i->f->is_raid(dev); 6361a7afa2SJames Bottomley } 6461a7afa2SJames Bottomley /* FIXME: look at other subsystems too */ 6561a7afa2SJames Bottomley return 0; 6661a7afa2SJames Bottomley } 6761a7afa2SJames Bottomley 6861a7afa2SJames Bottomley static int raid_setup(struct transport_container *tc, struct device *dev, 6961a7afa2SJames Bottomley struct class_device *cdev) 7061a7afa2SJames Bottomley { 7161a7afa2SJames Bottomley struct raid_data *rd; 7261a7afa2SJames Bottomley 7361a7afa2SJames Bottomley BUG_ON(class_get_devdata(cdev)); 7461a7afa2SJames Bottomley 7561a7afa2SJames Bottomley rd = kmalloc(sizeof(*rd), GFP_KERNEL); 7661a7afa2SJames Bottomley if (!rd) 7761a7afa2SJames Bottomley return -ENOMEM; 7861a7afa2SJames Bottomley 7961a7afa2SJames Bottomley memset(rd, 0, sizeof(*rd)); 8061a7afa2SJames Bottomley INIT_LIST_HEAD(&rd->component_list); 8161a7afa2SJames Bottomley class_set_devdata(cdev, rd); 8261a7afa2SJames Bottomley 8361a7afa2SJames Bottomley return 0; 8461a7afa2SJames Bottomley } 8561a7afa2SJames Bottomley 8661a7afa2SJames Bottomley static int raid_remove(struct transport_container *tc, struct device *dev, 8761a7afa2SJames Bottomley struct class_device *cdev) 8861a7afa2SJames Bottomley { 8961a7afa2SJames Bottomley struct raid_data *rd = class_get_devdata(cdev); 9061a7afa2SJames Bottomley struct raid_component *rc, *next; 9161a7afa2SJames Bottomley class_set_devdata(cdev, NULL); 9261a7afa2SJames Bottomley list_for_each_entry_safe(rc, next, &rd->component_list, node) { 9361a7afa2SJames Bottomley char buf[40]; 9461a7afa2SJames Bottomley snprintf(buf, sizeof(buf), "component-%d", rc->num); 9561a7afa2SJames Bottomley list_del(&rc->node); 9661a7afa2SJames Bottomley sysfs_remove_link(&cdev->kobj, buf); 9761a7afa2SJames Bottomley kfree(rc); 9861a7afa2SJames Bottomley } 9961a7afa2SJames Bottomley kfree(class_get_devdata(cdev)); 10061a7afa2SJames Bottomley return 0; 10161a7afa2SJames Bottomley } 10261a7afa2SJames Bottomley 10361a7afa2SJames Bottomley static DECLARE_TRANSPORT_CLASS(raid_class, 10461a7afa2SJames Bottomley "raid_devices", 10561a7afa2SJames Bottomley raid_setup, 10661a7afa2SJames Bottomley raid_remove, 10761a7afa2SJames Bottomley NULL); 10861a7afa2SJames Bottomley 10961a7afa2SJames Bottomley static struct { 11061a7afa2SJames Bottomley enum raid_state value; 11161a7afa2SJames Bottomley char *name; 11261a7afa2SJames Bottomley } raid_states[] = { 11361a7afa2SJames Bottomley { RAID_ACTIVE, "active" }, 11461a7afa2SJames Bottomley { RAID_DEGRADED, "degraded" }, 11561a7afa2SJames Bottomley { RAID_RESYNCING, "resyncing" }, 11661a7afa2SJames Bottomley { RAID_OFFLINE, "offline" }, 11761a7afa2SJames Bottomley }; 11861a7afa2SJames Bottomley 11961a7afa2SJames Bottomley static const char *raid_state_name(enum raid_state state) 12061a7afa2SJames Bottomley { 12161a7afa2SJames Bottomley int i; 12261a7afa2SJames Bottomley char *name = NULL; 12361a7afa2SJames Bottomley 12461a7afa2SJames Bottomley for (i = 0; i < sizeof(raid_states)/sizeof(raid_states[0]); i++) { 12561a7afa2SJames Bottomley if (raid_states[i].value == state) { 12661a7afa2SJames Bottomley name = raid_states[i].name; 12761a7afa2SJames Bottomley break; 12861a7afa2SJames Bottomley } 12961a7afa2SJames Bottomley } 13061a7afa2SJames Bottomley return name; 13161a7afa2SJames Bottomley } 13261a7afa2SJames Bottomley 13361a7afa2SJames Bottomley 13461a7afa2SJames Bottomley #define raid_attr_show_internal(attr, fmt, var, code) \ 13561a7afa2SJames Bottomley static ssize_t raid_show_##attr(struct class_device *cdev, char *buf) \ 13661a7afa2SJames Bottomley { \ 13761a7afa2SJames Bottomley struct raid_data *rd = class_get_devdata(cdev); \ 13861a7afa2SJames Bottomley code \ 13961a7afa2SJames Bottomley return snprintf(buf, 20, #fmt "\n", var); \ 14061a7afa2SJames Bottomley } 14161a7afa2SJames Bottomley 14261a7afa2SJames Bottomley #define raid_attr_ro_states(attr, states, code) \ 14361a7afa2SJames Bottomley raid_attr_show_internal(attr, %s, name, \ 14461a7afa2SJames Bottomley const char *name; \ 14561a7afa2SJames Bottomley code \ 14661a7afa2SJames Bottomley name = raid_##states##_name(rd->attr); \ 14761a7afa2SJames Bottomley ) \ 14861a7afa2SJames Bottomley static CLASS_DEVICE_ATTR(attr, S_IRUGO, raid_show_##attr, NULL) 14961a7afa2SJames Bottomley 15061a7afa2SJames Bottomley 15161a7afa2SJames Bottomley #define raid_attr_ro_internal(attr, code) \ 15261a7afa2SJames Bottomley raid_attr_show_internal(attr, %d, rd->attr, code) \ 15361a7afa2SJames Bottomley static CLASS_DEVICE_ATTR(attr, S_IRUGO, raid_show_##attr, NULL) 15461a7afa2SJames Bottomley 15561a7afa2SJames Bottomley #define ATTR_CODE(attr) \ 15661a7afa2SJames Bottomley struct raid_internal *i = class_device_to_raid_internal(cdev); \ 15761a7afa2SJames Bottomley if (i->f->get_##attr) \ 15861a7afa2SJames Bottomley i->f->get_##attr(cdev->dev); 15961a7afa2SJames Bottomley 16061a7afa2SJames Bottomley #define raid_attr_ro(attr) raid_attr_ro_internal(attr, ) 16161a7afa2SJames Bottomley #define raid_attr_ro_fn(attr) raid_attr_ro_internal(attr, ATTR_CODE(attr)) 16261a7afa2SJames Bottomley #define raid_attr_ro_state(attr) raid_attr_ro_states(attr, attr, ATTR_CODE(attr)) 16361a7afa2SJames Bottomley 16461a7afa2SJames Bottomley raid_attr_ro(level); 16561a7afa2SJames Bottomley raid_attr_ro_fn(resync); 16661a7afa2SJames Bottomley raid_attr_ro_state(state); 16761a7afa2SJames Bottomley 16861a7afa2SJames Bottomley void raid_component_add(struct raid_template *r,struct device *raid_dev, 16961a7afa2SJames Bottomley struct device *component_dev) 17061a7afa2SJames Bottomley { 17161a7afa2SJames Bottomley struct class_device *cdev = 17261a7afa2SJames Bottomley attribute_container_find_class_device(&r->raid_attrs.ac, 17361a7afa2SJames Bottomley raid_dev); 17461a7afa2SJames Bottomley struct raid_component *rc; 17561a7afa2SJames Bottomley struct raid_data *rd = class_get_devdata(cdev); 17661a7afa2SJames Bottomley char buf[40]; 17761a7afa2SJames Bottomley 17861a7afa2SJames Bottomley rc = kmalloc(sizeof(*rc), GFP_KERNEL); 17961a7afa2SJames Bottomley if (!rc) 18061a7afa2SJames Bottomley return; 18161a7afa2SJames Bottomley 18261a7afa2SJames Bottomley INIT_LIST_HEAD(&rc->node); 18361a7afa2SJames Bottomley rc->dev = component_dev; 18461a7afa2SJames Bottomley rc->num = rd->component_count++; 18561a7afa2SJames Bottomley 18661a7afa2SJames Bottomley snprintf(buf, sizeof(buf), "component-%d", rc->num); 18761a7afa2SJames Bottomley list_add_tail(&rc->node, &rd->component_list); 18861a7afa2SJames Bottomley sysfs_create_link(&cdev->kobj, &component_dev->kobj, buf); 18961a7afa2SJames Bottomley } 19061a7afa2SJames Bottomley EXPORT_SYMBOL(raid_component_add); 19161a7afa2SJames Bottomley 19261a7afa2SJames Bottomley struct raid_template * 19361a7afa2SJames Bottomley raid_class_attach(struct raid_function_template *ft) 19461a7afa2SJames Bottomley { 19561a7afa2SJames Bottomley struct raid_internal *i = kmalloc(sizeof(struct raid_internal), 19661a7afa2SJames Bottomley GFP_KERNEL); 19761a7afa2SJames Bottomley int count = 0; 19861a7afa2SJames Bottomley 19961a7afa2SJames Bottomley if (unlikely(!i)) 20061a7afa2SJames Bottomley return NULL; 20161a7afa2SJames Bottomley 20261a7afa2SJames Bottomley memset(i, 0, sizeof(*i)); 20361a7afa2SJames Bottomley 20461a7afa2SJames Bottomley i->f = ft; 20561a7afa2SJames Bottomley 20661a7afa2SJames Bottomley i->r.raid_attrs.ac.class = &raid_class.class; 20761a7afa2SJames Bottomley i->r.raid_attrs.ac.match = raid_match; 20861a7afa2SJames Bottomley i->r.raid_attrs.ac.attrs = &i->attrs[0]; 20961a7afa2SJames Bottomley 21061a7afa2SJames Bottomley attribute_container_register(&i->r.raid_attrs.ac); 21161a7afa2SJames Bottomley 21261a7afa2SJames Bottomley i->attrs[count++] = &class_device_attr_level; 21361a7afa2SJames Bottomley i->attrs[count++] = &class_device_attr_resync; 21461a7afa2SJames Bottomley i->attrs[count++] = &class_device_attr_state; 21561a7afa2SJames Bottomley 21661a7afa2SJames Bottomley i->attrs[count] = NULL; 21761a7afa2SJames Bottomley BUG_ON(count > RAID_NUM_ATTRS); 21861a7afa2SJames Bottomley 21961a7afa2SJames Bottomley return &i->r; 22061a7afa2SJames Bottomley } 22161a7afa2SJames Bottomley EXPORT_SYMBOL(raid_class_attach); 22261a7afa2SJames Bottomley 22361a7afa2SJames Bottomley void 22461a7afa2SJames Bottomley raid_class_release(struct raid_template *r) 22561a7afa2SJames Bottomley { 22661a7afa2SJames Bottomley struct raid_internal *i = to_raid_internal(r); 22761a7afa2SJames Bottomley 22861a7afa2SJames Bottomley attribute_container_unregister(&i->r.raid_attrs.ac); 22961a7afa2SJames Bottomley 23061a7afa2SJames Bottomley kfree(i); 23161a7afa2SJames Bottomley } 23261a7afa2SJames Bottomley EXPORT_SYMBOL(raid_class_release); 23361a7afa2SJames Bottomley 23461a7afa2SJames Bottomley static __init int raid_init(void) 23561a7afa2SJames Bottomley { 23661a7afa2SJames Bottomley return transport_class_register(&raid_class); 23761a7afa2SJames Bottomley } 23861a7afa2SJames Bottomley 23961a7afa2SJames Bottomley static __exit void raid_exit(void) 24061a7afa2SJames Bottomley { 24161a7afa2SJames Bottomley transport_class_unregister(&raid_class); 24261a7afa2SJames Bottomley } 24361a7afa2SJames Bottomley 24461a7afa2SJames Bottomley MODULE_AUTHOR("James Bottomley"); 24561a7afa2SJames Bottomley MODULE_DESCRIPTION("RAID device class"); 24661a7afa2SJames Bottomley MODULE_LICENSE("GPL"); 24761a7afa2SJames Bottomley 24861a7afa2SJames Bottomley module_init(raid_init); 24961a7afa2SJames Bottomley module_exit(raid_exit); 25061a7afa2SJames Bottomley 251