btrfs: do not allow mounting non-subvolumes via subvol option

There's a missing test whether the path passed to subvol=path option
during mount is a real subvolume, allowing any directory located in
default subovlume to be passed and accepted for mount.

(current btrfs progs prevent this early)
$ btrfs subvol snapshot . p1-snap
ERROR: '.' is not a subvolume

(with "is subvolume?" test bypassed)
$ btrfs subvol snapshot . p1-snap
Create a snapshot of '.' in './p1-snap'

$ btrfs subvol list -p .
ID 258 parent 5 top level 5 path subvol
ID 259 parent 5 top level 5 path subvol1
ID 260 parent 5 top level 5 path default-subvol1
ID 262 parent 5 top level 5 path p1/p1-snapshot
ID 263 parent 259 top level 5 path subvol1/subvol1-snap

The problem I see is that this makes a false impression of snapshotting the
given subvolume but in fact snapshots the default one: a user expects outcome
like ID 263 but in fact gets ID 262 .

This patch makes mount fail with EINVAL with a message in syslog.

Signed-off-by: David Sterba <dsterba@suse.cz>

1 files changed, 19 insertions, 0 deletions

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 29eecbb6ec3..5429b1fa0bf 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -741,6 +741,16 @@ static int btrfs_set_super(struct super_block *s, void *data)
 }
 
 /*
+ * subvolumes are identified by ino 256
+ */
+static inline int is_subvolume_inode(struct inode *inode)
+{
+        if (inode && inode->i_ino == BTRFS_FIRST_FREE_OBJECTID)
+                return 1;
+        return 0;
+}
+
+/*
  * This will strip out the subvol=%s argument for an argument string and add
  * subvolid=0 to make sure we get the actual tree root for path walking to the
  * subvol we want.
@@ -843,6 +853,15 @@ static struct dentry *mount_subvol(const char *subvol_name, int flags,
         if (error)
                 return ERR_PTR(error);
 
+        if (!is_subvolume_inode(path.dentry->d_inode)) {
+                path_put(&path);
+                mntput(mnt);
+                error = -EINVAL;
+                printk(KERN_ERR "btrfs: '%s' is not a valid subvolume\n",
+                                subvol_name);
+                return ERR_PTR(-EINVAL);
+        }
+
         /* Get a ref to the sb and the dentry we found and return it */
         s = path.mnt->mnt_sb;
         atomic_inc(&s->s_active);