md: allow integers to be passed to md/level
e.g. allow md to interpret 'echo 4 > md/level' as a request for raid4.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 69f659e..b8a0fcf 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -2934,9 +2934,10 @@
static ssize_t
level_store(mddev_t *mddev, const char *buf, size_t len)
{
- char level[16];
+ char clevel[16];
ssize_t rv = len;
struct mdk_personality *pers;
+ long level;
void *priv;
mdk_rdev_t *rdev;
@@ -2969,19 +2970,22 @@
}
/* Now find the new personality */
- if (len == 0 || len >= sizeof(level))
+ if (len == 0 || len >= sizeof(clevel))
return -EINVAL;
- strncpy(level, buf, len);
- if (level[len-1] == '\n')
+ strncpy(clevel, buf, len);
+ if (clevel[len-1] == '\n')
len--;
- level[len] = 0;
+ clevel[len] = 0;
+ if (strict_strtol(clevel, 10, &level))
+ level = LEVEL_NONE;
- request_module("md-%s", level);
+ if (request_module("md-%s", clevel) != 0)
+ request_module("md-level-%s", clevel);
spin_lock(&pers_lock);
- pers = find_pers(LEVEL_NONE, level);
+ pers = find_pers(level, clevel);
if (!pers || !try_module_get(pers->owner)) {
spin_unlock(&pers_lock);
- printk(KERN_WARNING "md: personality %s not loaded\n", level);
+ printk(KERN_WARNING "md: personality %s not loaded\n", clevel);
return -EINVAL;
}
spin_unlock(&pers_lock);
@@ -2994,7 +2998,7 @@
if (!pers->takeover) {
module_put(pers->owner);
printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
- mdname(mddev), level);
+ mdname(mddev), clevel);
return -EINVAL;
}
@@ -3010,7 +3014,7 @@
mddev->delta_disks = 0;
module_put(pers->owner);
printk(KERN_WARNING "md: %s: %s would not accept array\n",
- mdname(mddev), level);
+ mdname(mddev), clevel);
return PTR_ERR(priv);
}