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315 lines
7.7 KiB
315 lines
7.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* raid_class.c - implementation of a simple raid visualisation class |
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* |
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* Copyright (c) 2005 - James Bottomley <[email protected]> |
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* |
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* This class is designed to allow raid attributes to be visualised and |
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* manipulated in a form independent of the underlying raid. Ultimately this |
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* should work for both hardware and software raids. |
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*/ |
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#include <linux/init.h> |
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#include <linux/module.h> |
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#include <linux/list.h> |
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#include <linux/slab.h> |
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#include <linux/string.h> |
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#include <linux/raid_class.h> |
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#include <scsi/scsi_device.h> |
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#include <scsi/scsi_host.h> |
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#define RAID_NUM_ATTRS 3 |
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struct raid_internal { |
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struct raid_template r; |
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struct raid_function_template *f; |
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/* The actual attributes */ |
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struct device_attribute private_attrs[RAID_NUM_ATTRS]; |
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/* The array of null terminated pointers to attributes |
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* needed by scsi_sysfs.c */ |
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struct device_attribute *attrs[RAID_NUM_ATTRS + 1]; |
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}; |
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struct raid_component { |
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struct list_head node; |
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struct device dev; |
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int num; |
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}; |
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#define to_raid_internal(tmpl) container_of(tmpl, struct raid_internal, r) |
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#define tc_to_raid_internal(tcont) ({ \ |
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struct raid_template *r = \ |
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container_of(tcont, struct raid_template, raid_attrs); \ |
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to_raid_internal(r); \ |
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}) |
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#define ac_to_raid_internal(acont) ({ \ |
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struct transport_container *tc = \ |
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container_of(acont, struct transport_container, ac); \ |
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tc_to_raid_internal(tc); \ |
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}) |
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#define device_to_raid_internal(dev) ({ \ |
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struct attribute_container *ac = \ |
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attribute_container_classdev_to_container(dev); \ |
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ac_to_raid_internal(ac); \ |
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}) |
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static int raid_match(struct attribute_container *cont, struct device *dev) |
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{ |
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/* We have to look for every subsystem that could house |
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* emulated RAID devices, so start with SCSI */ |
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struct raid_internal *i = ac_to_raid_internal(cont); |
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if (IS_ENABLED(CONFIG_SCSI) && scsi_is_sdev_device(dev)) { |
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struct scsi_device *sdev = to_scsi_device(dev); |
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if (i->f->cookie != sdev->host->hostt) |
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return 0; |
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return i->f->is_raid(dev); |
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} |
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/* FIXME: look at other subsystems too */ |
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return 0; |
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} |
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static int raid_setup(struct transport_container *tc, struct device *dev, |
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struct device *cdev) |
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{ |
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struct raid_data *rd; |
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BUG_ON(dev_get_drvdata(cdev)); |
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rd = kzalloc(sizeof(*rd), GFP_KERNEL); |
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if (!rd) |
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return -ENOMEM; |
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INIT_LIST_HEAD(&rd->component_list); |
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dev_set_drvdata(cdev, rd); |
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return 0; |
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} |
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static int raid_remove(struct transport_container *tc, struct device *dev, |
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struct device *cdev) |
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{ |
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struct raid_data *rd = dev_get_drvdata(cdev); |
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struct raid_component *rc, *next; |
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dev_printk(KERN_ERR, dev, "RAID REMOVE\n"); |
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dev_set_drvdata(cdev, NULL); |
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list_for_each_entry_safe(rc, next, &rd->component_list, node) { |
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list_del(&rc->node); |
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dev_printk(KERN_ERR, rc->dev.parent, "RAID COMPONENT REMOVE\n"); |
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device_unregister(&rc->dev); |
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} |
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dev_printk(KERN_ERR, dev, "RAID REMOVE DONE\n"); |
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kfree(rd); |
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return 0; |
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} |
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static DECLARE_TRANSPORT_CLASS(raid_class, |
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"raid_devices", |
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raid_setup, |
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raid_remove, |
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NULL); |
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static const struct { |
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enum raid_state value; |
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char *name; |
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} raid_states[] = { |
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{ RAID_STATE_UNKNOWN, "unknown" }, |
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{ RAID_STATE_ACTIVE, "active" }, |
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{ RAID_STATE_DEGRADED, "degraded" }, |
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{ RAID_STATE_RESYNCING, "resyncing" }, |
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{ RAID_STATE_OFFLINE, "offline" }, |
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}; |
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static const char *raid_state_name(enum raid_state state) |
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{ |
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int i; |
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char *name = NULL; |
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for (i = 0; i < ARRAY_SIZE(raid_states); i++) { |
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if (raid_states[i].value == state) { |
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name = raid_states[i].name; |
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break; |
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} |
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} |
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return name; |
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} |
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static struct { |
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enum raid_level value; |
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char *name; |
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} raid_levels[] = { |
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{ RAID_LEVEL_UNKNOWN, "unknown" }, |
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{ RAID_LEVEL_LINEAR, "linear" }, |
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{ RAID_LEVEL_0, "raid0" }, |
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{ RAID_LEVEL_1, "raid1" }, |
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{ RAID_LEVEL_10, "raid10" }, |
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{ RAID_LEVEL_1E, "raid1e" }, |
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{ RAID_LEVEL_3, "raid3" }, |
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{ RAID_LEVEL_4, "raid4" }, |
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{ RAID_LEVEL_5, "raid5" }, |
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{ RAID_LEVEL_50, "raid50" }, |
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{ RAID_LEVEL_6, "raid6" }, |
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{ RAID_LEVEL_JBOD, "jbod" }, |
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}; |
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static const char *raid_level_name(enum raid_level level) |
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{ |
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int i; |
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char *name = NULL; |
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for (i = 0; i < ARRAY_SIZE(raid_levels); i++) { |
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if (raid_levels[i].value == level) { |
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name = raid_levels[i].name; |
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break; |
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} |
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} |
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return name; |
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} |
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#define raid_attr_show_internal(attr, fmt, var, code) \ |
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static ssize_t raid_show_##attr(struct device *dev, \ |
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struct device_attribute *attr, \ |
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char *buf) \ |
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{ \ |
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struct raid_data *rd = dev_get_drvdata(dev); \ |
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code \ |
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return snprintf(buf, 20, #fmt "\n", var); \ |
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} |
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#define raid_attr_ro_states(attr, states, code) \ |
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raid_attr_show_internal(attr, %s, name, \ |
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const char *name; \ |
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code \ |
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name = raid_##states##_name(rd->attr); \ |
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) \ |
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static DEVICE_ATTR(attr, S_IRUGO, raid_show_##attr, NULL) |
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#define raid_attr_ro_internal(attr, code) \ |
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raid_attr_show_internal(attr, %d, rd->attr, code) \ |
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static DEVICE_ATTR(attr, S_IRUGO, raid_show_##attr, NULL) |
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#define ATTR_CODE(attr) \ |
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struct raid_internal *i = device_to_raid_internal(dev); \ |
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if (i->f->get_##attr) \ |
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i->f->get_##attr(dev->parent); |
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#define raid_attr_ro(attr) raid_attr_ro_internal(attr, ) |
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#define raid_attr_ro_fn(attr) raid_attr_ro_internal(attr, ATTR_CODE(attr)) |
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#define raid_attr_ro_state(attr) raid_attr_ro_states(attr, attr, ) |
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#define raid_attr_ro_state_fn(attr) raid_attr_ro_states(attr, attr, ATTR_CODE(attr)) |
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raid_attr_ro_state(level); |
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raid_attr_ro_fn(resync); |
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raid_attr_ro_state_fn(state); |
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static void raid_component_release(struct device *dev) |
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{ |
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struct raid_component *rc = |
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container_of(dev, struct raid_component, dev); |
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dev_printk(KERN_ERR, rc->dev.parent, "COMPONENT RELEASE\n"); |
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put_device(rc->dev.parent); |
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kfree(rc); |
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} |
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int raid_component_add(struct raid_template *r,struct device *raid_dev, |
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struct device *component_dev) |
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{ |
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struct device *cdev = |
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attribute_container_find_class_device(&r->raid_attrs.ac, |
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raid_dev); |
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struct raid_component *rc; |
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struct raid_data *rd = dev_get_drvdata(cdev); |
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int err; |
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rc = kzalloc(sizeof(*rc), GFP_KERNEL); |
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if (!rc) |
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return -ENOMEM; |
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INIT_LIST_HEAD(&rc->node); |
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device_initialize(&rc->dev); |
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rc->dev.release = raid_component_release; |
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rc->dev.parent = get_device(component_dev); |
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rc->num = rd->component_count++; |
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dev_set_name(&rc->dev, "component-%d", rc->num); |
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list_add_tail(&rc->node, &rd->component_list); |
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rc->dev.class = &raid_class.class; |
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err = device_add(&rc->dev); |
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if (err) |
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goto err_out; |
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return 0; |
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err_out: |
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list_del(&rc->node); |
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rd->component_count--; |
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put_device(component_dev); |
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kfree(rc); |
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return err; |
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} |
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EXPORT_SYMBOL(raid_component_add); |
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struct raid_template * |
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raid_class_attach(struct raid_function_template *ft) |
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{ |
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struct raid_internal *i = kzalloc(sizeof(struct raid_internal), |
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GFP_KERNEL); |
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int count = 0; |
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if (unlikely(!i)) |
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return NULL; |
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i->f = ft; |
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i->r.raid_attrs.ac.class = &raid_class.class; |
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i->r.raid_attrs.ac.match = raid_match; |
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i->r.raid_attrs.ac.attrs = &i->attrs[0]; |
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attribute_container_register(&i->r.raid_attrs.ac); |
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i->attrs[count++] = &dev_attr_level; |
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i->attrs[count++] = &dev_attr_resync; |
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i->attrs[count++] = &dev_attr_state; |
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i->attrs[count] = NULL; |
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BUG_ON(count > RAID_NUM_ATTRS); |
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return &i->r; |
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} |
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EXPORT_SYMBOL(raid_class_attach); |
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void |
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raid_class_release(struct raid_template *r) |
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{ |
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struct raid_internal *i = to_raid_internal(r); |
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BUG_ON(attribute_container_unregister(&i->r.raid_attrs.ac)); |
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kfree(i); |
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} |
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EXPORT_SYMBOL(raid_class_release); |
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static __init int raid_init(void) |
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{ |
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return transport_class_register(&raid_class); |
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} |
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static __exit void raid_exit(void) |
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{ |
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transport_class_unregister(&raid_class); |
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} |
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MODULE_AUTHOR("James Bottomley"); |
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MODULE_DESCRIPTION("RAID device class"); |
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MODULE_LICENSE("GPL"); |
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module_init(raid_init); |
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module_exit(raid_exit); |
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