[PATCH] md: initial sysfs support for md
Start using kobjects in mddevs, and provide a couple of simple attributes
(level and disks). Attributes live in
/sys/block/mdX/md/attr-name
Signed-off-by: Neil Brown <neilb@suse.de>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 9ecf51e..a68ad85 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -181,7 +181,7 @@
if (!mddev->raid_disks && list_empty(&mddev->disks)) {
list_del(&mddev->all_mddevs);
blk_put_queue(mddev->queue);
- kfree(mddev);
+ kobject_unregister(&mddev->kobj);
}
spin_unlock(&all_mddevs_lock);
}
@@ -1551,6 +1551,85 @@
}
+struct md_sysfs_entry {
+ struct attribute attr;
+ ssize_t (*show)(mddev_t *, char *);
+ ssize_t (*store)(mddev_t *, const char *, size_t);
+};
+
+static ssize_t
+md_show_level(mddev_t *mddev, char *page)
+{
+ mdk_personality_t *p = mddev->pers;
+ if (p == NULL)
+ return 0;
+ if (mddev->level >= 0)
+ return sprintf(page, "RAID-%d\n", mddev->level);
+ else
+ return sprintf(page, "%s\n", p->name);
+}
+
+static struct md_sysfs_entry md_level = {
+ .attr = {.name = "level", .mode = S_IRUGO },
+ .show = md_show_level,
+};
+
+static ssize_t
+md_show_rdisks(mddev_t *mddev, char *page)
+{
+ return sprintf(page, "%d\n", mddev->raid_disks);
+}
+
+static struct md_sysfs_entry md_raid_disks = {
+ .attr = {.name = "raid_disks", .mode = S_IRUGO },
+ .show = md_show_rdisks,
+};
+
+static struct attribute *md_default_attrs[] = {
+ &md_level.attr,
+ &md_raid_disks.attr,
+ NULL,
+};
+
+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);
+
+ if (!entry->show)
+ return -EIO;
+ return entry->show(mddev, page);
+}
+
+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);
+
+ if (!entry->store)
+ return -EIO;
+ return entry->store(mddev, page, length);
+}
+
+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,
+};
+
int mdp_major = 0;
static struct kobject *md_probe(dev_t dev, int *part, void *data)
@@ -1592,6 +1671,11 @@
add_disk(disk);
mddev->gendisk = disk;
up(&disks_sem);
+ mddev->kobj.parent = kobject_get(&disk->kobj);
+ mddev->kobj.k_name = NULL;
+ snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md");
+ mddev->kobj.ktype = &md_ktype;
+ kobject_register(&mddev->kobj);
return NULL;
}
