Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs...

[linux-drm-fsl-dcu.git] / fs / btrfs / super.c

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 0a14b495532fcc901d3c3baaa29cb4753d327d7f..f3fd7e2cbc383aaefd42be70a02f80c759b6979b 100644 (file)
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -37,7 +37,7 @@
 #include <linux/ctype.h>
 #include <linux/namei.h>
 #include <linux/miscdevice.h>
-#include <linux/version.h>
+#include <linux/magic.h>
 #include "compat.h"
 #include "ctree.h"
 #include "disk-io.h"
@@ -51,7 +51,6 @@
 #include "export.h"
 #include "compression.h"
 
-#define BTRFS_SUPER_MAGIC 0x9123683E
 
 static struct super_operations btrfs_super_ops;
 
@@ -582,18 +581,20 @@ static long btrfs_control_ioctl(struct file *file, unsigned int cmd,
 {
        struct btrfs_ioctl_vol_args *vol;
        struct btrfs_fs_devices *fs_devices;
-       int ret = 0;
-       int len;
+       int ret = -ENOTTY;
 
        if (!capable(CAP_SYS_ADMIN))
                return -EPERM;
 
        vol = kmalloc(sizeof(*vol), GFP_KERNEL);
+       if (!vol)
+               return -ENOMEM;
+
        if (copy_from_user(vol, (void __user *)arg, sizeof(*vol))) {
                ret = -EFAULT;
                goto out;
        }
-       len = strnlen(vol->name, BTRFS_PATH_NAME_MAX);
+
        switch (cmd) {
        case BTRFS_IOC_SCAN_DEV:
                ret = btrfs_scan_one_device(vol->name, FMODE_READ,