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    Subject[01/28] cifs: always do is_path_accessible check in cifs_mount
    2.6.32-longterm review patch.  If anyone has any objections, please let us know.

    ------------------

    From: Jeff Layton <jlayton@redhat.com>

    commit 70945643722ffeac779d2529a348f99567fa5c33 upstream.

    Currently, we skip doing the is_path_accessible check in cifs_mount if
    there is no prefixpath. I have a report of at least one server however
    that allows a TREE_CONNECT to a share that has a DFS referral at its
    root. The reporter in this case was using a UNC that had no prefixpath,
    so the is_path_accessible check was not triggered and the box later hit
    a BUG() because we were chasing a DFS referral on the root dentry for
    the mount.

    This patch fixes this by removing the check for a zero-length
    prefixpath. That should make the is_path_accessible check be done in
    this situation and should allow the client to chase the DFS referral at
    mount time instead.

    Reported-and-Tested-by: Yogesh Sharma <ysharma@cymer.com>
    Signed-off-by: Jeff Layton <jlayton@redhat.com>
    Signed-off-by: Steve French <sfrench@us.ibm.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

    ---
    fs/cifs/connect.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/fs/cifs/connect.c
    +++ b/fs/cifs/connect.c
    @@ -2532,7 +2532,7 @@ try_mount_again:

    remote_path_check:
    /* check if a whole path (including prepath) is not remote */
    - if (!rc && cifs_sb->prepathlen && tcon) {
    + if (!rc && tcon) {
    /* build_path_to_root works only when we have a valid tcon */
    full_path = cifs_build_path_to_root(cifs_sb);
    if (full_path == NULL) {



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