tree 5d4776506d38b5ac463147cae754ba0d6b6394c0
parent 0cbbdf7c9c46467bfb7129c30236f36a679ab244
author Josef Bacik <josef@redhat.com> 1311622835 -0400
committer Josef Bacik <josef@redhat.com> 1319051549 -0400

Btrfs: use d_obtain_alias when mounting subvol/subvolid

Currently what we do is just wrong.  We either

1) Alloc a new "root" dentry with sb->s_root as it's parent which is just wrong
as we could walk into this subvol later on via another path and hilarity could
ensue.  Also we don't check the return value of d_splice_alias which isn't good
either.

or

2) Do a d_find_alias() which we could have lost our dentry from cache at this
point and found nothing.

So use d_obtain_alias().  In the case that we already have the inode/dentry in
cache we will get the correct dentry.  If not we will get a disconnected dentry
tree so if we walk into it later on everything will be connected up properly.
Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>