Btrfs: do not do balance in readonly mode

In normal cases, we would not be allowed to do balance in RO mode.
However, when we're using a seeding device and adding another device to sprout,
things will change:

$ mkfs.btrfs /dev/sdb7
$ btrfstune -S 1 /dev/sdb7
$ mount /dev/sdb7 /mnt/btrfs -o ro
$ btrfs fi bal /mnt/btrfs   -----------------------> fail.
$ btrfs dev add /dev/sdb8 /mnt/btrfs
$ btrfs fi bal /mnt/btrfs   -----------------------> works!

It should not be designed as an exception, and we'd better add another check for
mnt flags.

Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Reviewed-by: Josef Bacik <josef@redhat.com>

1 files changed, 9 insertions, 3 deletions

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 3d8ab27622cd..15baf9456300 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -3216,8 +3216,9 @@ void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock,
         }
 }
 
-static long btrfs_ioctl_balance(struct btrfs_root *root, void __user *arg)
+static long btrfs_ioctl_balance(struct file *file, void __user *arg)
 {
+        struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
         struct btrfs_fs_info *fs_info = root->fs_info;
         struct btrfs_ioctl_balance_args *bargs;
         struct btrfs_balance_control *bctl;
@@ -3229,6 +3230,10 @@ static long btrfs_ioctl_balance(struct btrfs_root *root, void __user *arg)
         if (fs_info->sb->s_flags & MS_RDONLY)
                 return -EROFS;
 
+        ret = mnt_want_write(file->f_path.mnt);
+        if (ret)
+                return ret;
+
         mutex_lock(&fs_info->volume_mutex);
         mutex_lock(&fs_info->balance_mutex);
 
@@ -3295,6 +3300,7 @@ out_bargs:
 out:
         mutex_unlock(&fs_info->balance_mutex);
         mutex_unlock(&fs_info->volume_mutex);
+        mnt_drop_write(file->f_path.mnt);
         return ret;
 }
 
@@ -3390,7 +3396,7 @@ long btrfs_ioctl(struct file *file, unsigned int
         case BTRFS_IOC_DEV_INFO:
                 return btrfs_ioctl_dev_info(root, argp);
         case BTRFS_IOC_BALANCE:
-                return btrfs_ioctl_balance(root, NULL);
+                return btrfs_ioctl_balance(file, NULL);
         case BTRFS_IOC_CLONE:
                 return btrfs_ioctl_clone(file, arg, 0, 0, 0);
         case BTRFS_IOC_CLONE_RANGE:
@@ -3423,7 +3429,7 @@ long btrfs_ioctl(struct file *file, unsigned int
         case BTRFS_IOC_SCRUB_PROGRESS:
                 return btrfs_ioctl_scrub_progress(root, argp);
         case BTRFS_IOC_BALANCE_V2:
-                return btrfs_ioctl_balance(root, argp);
+                return btrfs_ioctl_balance(file, argp);
         case BTRFS_IOC_BALANCE_CTL:
                 return btrfs_ioctl_balance_ctl(root, arg);
         case BTRFS_IOC_BALANCE_PROGRESS: