btrfs: hold a root ref in btrfs_get_dentry
Looking up the inode we need to search the root, make sure we hold a reference on that root while we're doing the lookup. Signed-off-by: NJosef Bacik <josef@toxicpanda.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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