+static ssize_t
+level_show(mddev_t *mddev, char *page)
+{
+ struct mdk_personality *p = mddev->pers;
+ if (p)
+ return sprintf(page, "%s\n", p->name);
+ else if (mddev->clevel[0])
+ return sprintf(page, "%s\n", mddev->clevel);
+ else if (mddev->level != LEVEL_NONE)
+ return sprintf(page, "%d\n", mddev->level);
+ else
+ return 0;
+}
+
+static ssize_t
+level_store(mddev_t *mddev, const char *buf, size_t len)
+{
+ int rv = len;
+ if (mddev->pers)
+ return -EBUSY;
+ if (len == 0)
+ return 0;
+ if (len >= sizeof(mddev->clevel))
+ return -ENOSPC;
+ strncpy(mddev->clevel, buf, len);
+ if (mddev->clevel[len-1] == '\n')
+ len--;
+ mddev->clevel[len] = 0;
+ mddev->level = LEVEL_NONE;
+ return rv;
+}
+
+static struct md_sysfs_entry md_level =
+__ATTR(level, 0644, level_show, level_store);
+
+static ssize_t
+raid_disks_show(mddev_t *mddev, char *page)
+{
+ if (mddev->raid_disks == 0)
+ return 0;
+ return sprintf(page, "%d\n", mddev->raid_disks);
+}
+
+static int update_raid_disks(mddev_t *mddev, int raid_disks);
+
+static ssize_t
+raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
+{
+ /* can only set raid_disks if array is not yet active */
+ char *e;
+ int rv = 0;
+ unsigned long n = simple_strtoul(buf, &e, 10);
+
+ if (!*buf || (*e && *e != '\n'))
+ return -EINVAL;
+
+ if (mddev->pers)
+ rv = update_raid_disks(mddev, n);
+ else
+ mddev->raid_disks = n;
+ return rv ? rv : len;
+}
+static struct md_sysfs_entry md_raid_disks =
+__ATTR(raid_disks, 0644, raid_disks_show, raid_disks_store);
+
+static ssize_t
+chunk_size_show(mddev_t *mddev, char *page)
+{
+ return sprintf(page, "%d\n", mddev->chunk_size);
+}
+
+static ssize_t
+chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
+{
+ /* can only set chunk_size if array is not yet active */
+ char *e;
+ unsigned long n = simple_strtoul(buf, &e, 10);
+
+ if (mddev->pers)
+ return -EBUSY;
+ if (!*buf || (*e && *e != '\n'))
+ return -EINVAL;
+
+ mddev->chunk_size = n;
+ return len;
+}
+static struct md_sysfs_entry md_chunk_size =
+__ATTR(chunk_size, 0644, chunk_size_show, chunk_size_store);
+
+static ssize_t
+null_show(mddev_t *mddev, char *page)
+{
+ return -EINVAL;
+}
+
+static ssize_t
+new_dev_store(mddev_t *mddev, const char *buf, size_t len)
+{
+ /* buf must be %d:%d\n? giving major and minor numbers */
+ /* The new device is added to the array.
+ * If the array has a persistent superblock, we read the
+ * superblock to initialise info and check validity.
+ * Otherwise, only checking done is that in bind_rdev_to_array,
+ * which mainly checks size.
+ */
+ char *e;
+ int major = simple_strtoul(buf, &e, 10);
+ int minor;
+ dev_t dev;
+ mdk_rdev_t *rdev;
+ int err;
+
+ if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
+ return -EINVAL;
+ minor = simple_strtoul(e+1, &e, 10);
+ if (*e && *e != '\n')
+ return -EINVAL;
+ dev = MKDEV(major, minor);
+ if (major != MAJOR(dev) ||
+ minor != MINOR(dev))
+ return -EOVERFLOW;
+
+
+ if (mddev->persistent) {
+ rdev = md_import_device(dev, mddev->major_version,
+ mddev->minor_version);
+ if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
+ mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
+ mdk_rdev_t, same_set);
+ err = super_types[mddev->major_version]
+ .load_super(rdev, rdev0, mddev->minor_version);
+ if (err < 0)
+ goto out;
+ }
+ } else
+ rdev = md_import_device(dev, -1, -1);
+
+ if (IS_ERR(rdev))
+ return PTR_ERR(rdev);
+ err = bind_rdev_to_array(rdev, mddev);
+ out:
+ if (err)
+ export_rdev(rdev);
+ return err ? err : len;
+}
+
+static struct md_sysfs_entry md_new_device =
+__ATTR(new_dev, 0200, null_show, new_dev_store);
+
+static ssize_t
+size_show(mddev_t *mddev, char *page)
+{
+ return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
+}
+
+static int update_size(mddev_t *mddev, unsigned long size);
+
+static ssize_t
+size_store(mddev_t *mddev, const char *buf, size_t len)
+{
+ /* If array is inactive, we can reduce the component size, but
+ * not increase it (except from 0).
+ * If array is active, we can try an on-line resize
+ */
+ char *e;
+ int err = 0;
+ unsigned long long size = simple_strtoull(buf, &e, 10);
+ if (!*buf || *buf == '\n' ||
+ (*e && *e != '\n'))
+ return -EINVAL;
+
+ if (mddev->pers) {
+ err = update_size(mddev, size);
+ md_update_sb(mddev);
+ } else {
+ if (mddev->size == 0 ||
+ mddev->size > size)
+ mddev->size = size;
+ else
+ err = -ENOSPC;
+ }
+ return err ? err : len;
+}
+
+static struct md_sysfs_entry md_size =
+__ATTR(component_size, 0644, size_show, size_store);
+
+
+/* Metdata version.
+ * This is either 'none' for arrays with externally managed metadata,
+ * or N.M for internally known formats
+ */
+static ssize_t
+metadata_show(mddev_t *mddev, char *page)
+{
+ if (mddev->persistent)
+ return sprintf(page, "%d.%d\n",
+ mddev->major_version, mddev->minor_version);
+ else
+ return sprintf(page, "none\n");
+}
+
+static ssize_t
+metadata_store(mddev_t *mddev, const char *buf, size_t len)
+{
+ int major, minor;
+ char *e;
+ if (!list_empty(&mddev->disks))
+ return -EBUSY;
+
+ if (cmd_match(buf, "none")) {
+ mddev->persistent = 0;
+ mddev->major_version = 0;
+ mddev->minor_version = 90;
+ return len;
+ }
+ major = simple_strtoul(buf, &e, 10);
+ if (e==buf || *e != '.')
+ return -EINVAL;
+ buf = e+1;
+ minor = simple_strtoul(buf, &e, 10);
+ if (e==buf || *e != '\n')
+ return -EINVAL;
+ if (major >= sizeof(super_types)/sizeof(super_types[0]) ||
+ super_types[major].name == NULL)
+ return -ENOENT;
+ mddev->major_version = major;
+ mddev->minor_version = minor;
+ mddev->persistent = 1;
+ return len;
+}
+
+static struct md_sysfs_entry md_metadata =
+__ATTR(metadata_version, 0644, metadata_show, metadata_store);
+
+static ssize_t
+action_show(mddev_t *mddev, char *page)
+{
+ char *type = "idle";
+ if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
+ test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) {
+ if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
+ type = "reshape";
+ else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
+ if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
+ type = "resync";
+ else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
+ type = "check";
+ else
+ type = "repair";
+ } else
+ type = "recover";
+ }
+ return sprintf(page, "%s\n", type);
+}
+
+static ssize_t
+action_store(mddev_t *mddev, const char *page, size_t len)
+{
+ if (!mddev->pers || !mddev->pers->sync_request)
+ return -EINVAL;
+
+ if (cmd_match(page, "idle")) {
+ if (mddev->sync_thread) {
+ set_bit(MD_RECOVERY_INTR, &mddev->recovery);
+ md_unregister_thread(mddev->sync_thread);
+ mddev->sync_thread = NULL;
+ mddev->recovery = 0;
+ }
+ } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
+ test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
+ return -EBUSY;
+ else if (cmd_match(page, "resync") || cmd_match(page, "recover"))
+ set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
+ else if (cmd_match(page, "reshape")) {
+ int err;
+ if (mddev->pers->start_reshape == NULL)
+ return -EINVAL;
+ err = mddev->pers->start_reshape(mddev);
+ if (err)
+ return err;
+ } else {
+ if (cmd_match(page, "check"))
+ set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
+ else if (!cmd_match(page, "repair"))
+ return -EINVAL;
+ set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
+ set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
+ }
+ set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
+ md_wakeup_thread(mddev->thread);
+ return len;
+}
+
+static ssize_t
+mismatch_cnt_show(mddev_t *mddev, char *page)
+{
+ return sprintf(page, "%llu\n",
+ (unsigned long long) mddev->resync_mismatches);
+}
+
+static struct md_sysfs_entry
+md_scan_mode = __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
+
+
+static struct md_sysfs_entry
+md_mismatches = __ATTR_RO(mismatch_cnt);
+
+static ssize_t
+sync_min_show(mddev_t *mddev, char *page)
+{
+ return sprintf(page, "%d (%s)\n", speed_min(mddev),
+ mddev->sync_speed_min ? "local": "system");
+}
+
+static ssize_t
+sync_min_store(mddev_t *mddev, const char *buf, size_t len)
+{
+ int min;
+ char *e;
+ if (strncmp(buf, "system", 6)==0) {
+ mddev->sync_speed_min = 0;
+ return len;
+ }
+ min = simple_strtoul(buf, &e, 10);
+ if (buf == e || (*e && *e != '\n') || min <= 0)
+ return -EINVAL;
+ mddev->sync_speed_min = min;
+ return len;
+}
+
+static struct md_sysfs_entry md_sync_min =
+__ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
+
+static ssize_t
+sync_max_show(mddev_t *mddev, char *page)
+{
+ return sprintf(page, "%d (%s)\n", speed_max(mddev),
+ mddev->sync_speed_max ? "local": "system");
+}
+
+static ssize_t
+sync_max_store(mddev_t *mddev, const char *buf, size_t len)
+{
+ int max;
+ char *e;
+ if (strncmp(buf, "system", 6)==0) {
+ mddev->sync_speed_max = 0;
+ return len;
+ }
+ max = simple_strtoul(buf, &e, 10);
+ if (buf == e || (*e && *e != '\n') || max <= 0)
+ return -EINVAL;
+ mddev->sync_speed_max = max;
+ return len;
+}
+
+static struct md_sysfs_entry md_sync_max =
+__ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
+
+
+static ssize_t
+sync_speed_show(mddev_t *mddev, char *page)
+{
+ unsigned long resync, dt, db;
+ resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
+ dt = ((jiffies - mddev->resync_mark) / HZ);
+ if (!dt) dt++;
+ db = resync - (mddev->resync_mark_cnt);
+ return sprintf(page, "%ld\n", db/dt/2); /* K/sec */
+}
+
+static struct md_sysfs_entry
+md_sync_speed = __ATTR_RO(sync_speed);
+
+static ssize_t
+sync_completed_show(mddev_t *mddev, char *page)
+{
+ unsigned long max_blocks, resync;
+
+ if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
+ max_blocks = mddev->resync_max_sectors;
+ else
+ max_blocks = mddev->size << 1;
+
+ resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
+ return sprintf(page, "%lu / %lu\n", resync, max_blocks);
+}
+
+static struct md_sysfs_entry
+md_sync_completed = __ATTR_RO(sync_completed);
+
+static ssize_t
+suspend_lo_show(mddev_t *mddev, char *page)
+{
+ return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
+}
+
+static ssize_t
+suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
+{
+ char *e;
+ unsigned long long new = simple_strtoull(buf, &e, 10);
+
+ if (mddev->pers->quiesce == NULL)
+ return -EINVAL;
+ if (buf == e || (*e && *e != '\n'))
+ return -EINVAL;
+ if (new >= mddev->suspend_hi ||
+ (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
+ mddev->suspend_lo = new;
+ mddev->pers->quiesce(mddev, 2);
+ return len;
+ } else
+ return -EINVAL;
+}
+static struct md_sysfs_entry md_suspend_lo =
+__ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
+
+
+static ssize_t
+suspend_hi_show(mddev_t *mddev, char *page)
+{
+ return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
+}
+
+static ssize_t
+suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
+{
+ char *e;
+ unsigned long long new = simple_strtoull(buf, &e, 10);
+
+ if (mddev->pers->quiesce == NULL)
+ return -EINVAL;
+ if (buf == e || (*e && *e != '\n'))
+ return -EINVAL;
+ if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
+ (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
+ mddev->suspend_hi = new;
+ mddev->pers->quiesce(mddev, 1);
+ mddev->pers->quiesce(mddev, 0);
+ return len;
+ } else
+ return -EINVAL;
+}
+static struct md_sysfs_entry md_suspend_hi =
+__ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
+
+
+static struct attribute *md_default_attrs[] = {
+ &md_level.attr,
+ &md_raid_disks.attr,
+ &md_chunk_size.attr,
+ &md_size.attr,
+ &md_metadata.attr,
+ &md_new_device.attr,
+ NULL,
+};
+
+static struct attribute *md_redundancy_attrs[] = {
+ &md_scan_mode.attr,
+ &md_mismatches.attr,
+ &md_sync_min.attr,
+ &md_sync_max.attr,
+ &md_sync_speed.attr,
+ &md_sync_completed.attr,
+ &md_suspend_lo.attr,
+ &md_suspend_hi.attr,
+ NULL,
+};
+static struct attribute_group md_redundancy_group = {
+ .name = NULL,
+ .attrs = md_redundancy_attrs,
+};
+
+
+static ssize_t
+md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
+{
+ struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
+ mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
+ ssize_t rv;
+
+ if (!entry->show)
+ return -EIO;
+ rv = mddev_lock(mddev);
+ if (!rv) {
+ rv = entry->show(mddev, page);
+ mddev_unlock(mddev);
+ }
+ return rv;
+}
+
+static ssize_t
+md_attr_store(struct kobject *kobj, struct attribute *attr,
+ const char *page, size_t length)
+{
+ struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
+ mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
+ ssize_t rv;
+
+ if (!entry->store)
+ return -EIO;
+ rv = mddev_lock(mddev);
+ if (!rv) {
+ rv = entry->store(mddev, page, length);
+ mddev_unlock(mddev);
+ }
+ return rv;
+}
+
+static void md_free(struct kobject *ko)
+{
+ mddev_t *mddev = container_of(ko, mddev_t, kobj);
+ kfree(mddev);
+}
+
+static struct sysfs_ops md_sysfs_ops = {
+ .show = md_attr_show,
+ .store = md_attr_store,
+};
+static struct kobj_type md_ktype = {
+ .release = md_free,
+ .sysfs_ops = &md_sysfs_ops,
+ .default_attrs = md_default_attrs,
+};
+