Commit d9d166c2 authored by NeilBrown's avatar NeilBrown Committed by Linus Torvalds

[PATCH] md: allow array level to be set textually via sysfs

Signed-off-by: default avatarNeil Brown <neilb@suse.de>
Acked-by: Greg Kroah-Hartman's avatarGreg KH <greg@kroah.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 8bb93aac
......@@ -189,6 +189,14 @@ All md devices contain:
1.2 (newer format in varying locations) or "none" indicating that
the kernel isn't managing metadata at all.
level
The raid 'level' for this array. The name will often (but not
always) be the same as the name of the module that implements the
level. To be auto-loaded the module must have an alias
md-$LEVEL e.g. md-raid5
This can be written only while the array is being assembled, not
after it is started.
As component devices are added to an md array, they appear in the 'md'
directory as new directories named
dev-XXX
......
......@@ -342,4 +342,5 @@ module_init(raid_init);
module_exit(raid_exit);
MODULE_LICENSE("GPL");
MODULE_ALIAS("md-personality-10"); /* faulty */
MODULE_ALIAS("md-faulty");
MODULE_ALIAS("md-level--5");
......@@ -376,5 +376,6 @@ static void linear_exit (void)
module_init(linear_init);
module_exit(linear_exit);
MODULE_LICENSE("GPL");
MODULE_ALIAS("md-personality-1"); /* LINEAR - degrecated*/
MODULE_ALIAS("md-personality-1"); /* LINEAR - deprecated*/
MODULE_ALIAS("md-linear");
MODULE_ALIAS("md-level--1");
......@@ -303,12 +303,15 @@ static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
return NULL;
}
static struct mdk_personality *find_pers(int level)
static struct mdk_personality *find_pers(int level, char *clevel)
{
struct mdk_personality *pers;
list_for_each_entry(pers, &pers_list, list)
if (pers->level == level)
list_for_each_entry(pers, &pers_list, list) {
if (level != LEVEL_NONE && pers->level == level)
return pers;
if (strcmp(pers->name, clevel)==0)
return pers;
}
return NULL;
}
......@@ -715,6 +718,7 @@ static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
mddev->ctime = sb->ctime;
mddev->utime = sb->utime;
mddev->level = sb->level;
mddev->clevel[0] = 0;
mddev->layout = sb->layout;
mddev->raid_disks = sb->raid_disks;
mddev->size = sb->size;
......@@ -1051,6 +1055,7 @@ static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
mddev->level = le32_to_cpu(sb->level);
mddev->clevel[0] = 0;
mddev->layout = le32_to_cpu(sb->layout);
mddev->raid_disks = le32_to_cpu(sb->raid_disks);
mddev->size = le64_to_cpu(sb->size)/2;
......@@ -1774,15 +1779,36 @@ static ssize_t
level_show(mddev_t *mddev, char *page)
{
struct mdk_personality *p = mddev->pers;
if (p == NULL && mddev->raid_disks == 0)
return 0;
if (mddev->level >= 0)
return sprintf(page, "raid%d\n", mddev->level);
else
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_RO(level);
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)
......@@ -2158,7 +2184,10 @@ static int do_md_run(mddev_t * mddev)
}
#ifdef CONFIG_KMOD
request_module("md-level-%d", mddev->level);
if (mddev->level != LEVEL_NONE)
request_module("md-level-%d", mddev->level);
else if (mddev->clevel[0])
request_module("md-%s", mddev->clevel);
#endif
/*
......@@ -2180,15 +2209,21 @@ static int do_md_run(mddev_t * mddev)
return -ENOMEM;
spin_lock(&pers_lock);
pers = find_pers(mddev->level);
pers = find_pers(mddev->level, mddev->clevel);
if (!pers || !try_module_get(pers->owner)) {
spin_unlock(&pers_lock);
printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
mddev->level);
if (mddev->level != LEVEL_NONE)
printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
mddev->level);
else
printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
mddev->clevel);
return -EINVAL;
}
mddev->pers = pers;
spin_unlock(&pers_lock);
mddev->level = pers->level;
strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
mddev->recovery = 0;
mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
......
......@@ -578,4 +578,5 @@ module_init(multipath_init);
module_exit(multipath_exit);
MODULE_LICENSE("GPL");
MODULE_ALIAS("md-personality-7"); /* MULTIPATH */
MODULE_ALIAS("md-multipath");
MODULE_ALIAS("md-level--4");
......@@ -536,4 +536,5 @@ module_init(raid0_init);
module_exit(raid0_exit);
MODULE_LICENSE("GPL");
MODULE_ALIAS("md-personality-2"); /* RAID0 */
MODULE_ALIAS("md-raid0");
MODULE_ALIAS("md-level-0");
......@@ -2092,4 +2092,5 @@ module_init(raid_init);
module_exit(raid_exit);
MODULE_LICENSE("GPL");
MODULE_ALIAS("md-personality-3"); /* RAID1 */
MODULE_ALIAS("md-raid1");
MODULE_ALIAS("md-level-1");
......@@ -2117,4 +2117,5 @@ module_init(raid_init);
module_exit(raid_exit);
MODULE_LICENSE("GPL");
MODULE_ALIAS("md-personality-9"); /* RAID10 */
MODULE_ALIAS("md-raid10");
MODULE_ALIAS("md-level-10");
......@@ -2240,5 +2240,7 @@ module_init(raid5_init);
module_exit(raid5_exit);
MODULE_LICENSE("GPL");
MODULE_ALIAS("md-personality-4"); /* RAID5 */
MODULE_ALIAS("md-raid5");
MODULE_ALIAS("md-raid4");
MODULE_ALIAS("md-level-5");
MODULE_ALIAS("md-level-4");
......@@ -2341,4 +2341,5 @@ module_init(raid6_init);
module_exit(raid6_exit);
MODULE_LICENSE("GPL");
MODULE_ALIAS("md-personality-8"); /* RAID6 */
MODULE_ALIAS("md-raid6");
MODULE_ALIAS("md-level-6");
......@@ -119,6 +119,7 @@ struct mddev_s
int chunk_size;
time_t ctime, utime;
int level, layout;
char clevel[16];
int raid_disks;
int max_disks;
sector_t size; /* used size of component devices */
......
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