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[PATCH] md: initial sysfs support for md

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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>
This commit is contained in:
NeilBrown 2005-11-08 21:39:23 -08:00 committed by Linus Torvalds
parent 4e5314b56a
commit eae1701fbd
2 changed files with 87 additions and 1 deletions
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86
drivers/md/md.c
View File

@ -181,7 +181,7 @@ static void mddev_put(mddev_t *mddev)
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 @@ static void analyze_sbs(mddev_t * mddev)
}
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 @@ static struct kobject *md_probe(dev_t dev, int *part, void *data)
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;
}

2
include/linux/raid/md_k.h
View File

@ -148,6 +148,8 @@ struct mddev_s
struct gendisk *gendisk;
struct kobject kobj;
/* Superblock information */
int major_version,
minor_version,