[PATCH] md: allow array level to be set textually via sysfs
Signed-off-by: Neil Brown <neilb@suse.de>
Acked-by: 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 ecc0166..594d8c3 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -303,12 +303,15 @@
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 @@
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 @@
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 @@
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 struct md_sysfs_entry md_level = __ATTR_RO(level);
+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)
@@ -2158,7 +2184,10 @@
}
#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 @@
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 */