315 lines
7.6 KiB
C
315 lines
7.6 KiB
C
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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 <James.Bottomley@steeleye.com>
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*
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* This file is licensed under GPLv2
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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 (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_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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};
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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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