From c1508ca23653245266e2e3ab69a8dad464f7a569 Mon Sep 17 00:00:00 2001 From: Sean Finney Date: Mon, 11 Apr 2011 13:19:31 +0000 Subject: [PATCH] cifs: Add support for mounting Windows 2008 DFS shares Windows 2008 CIFS servers do not always return PATH_NOT_COVERED when attempting to access a DFS share. Therefore, when checking for remote shares, unconditionally ask for a DFS referral for the UNC (w/out prepath) before continuing with previous behavior of attempting to access the UNC + prepath and checking for PATH_NOT_COVERED. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=31092 Reviewed-by: Jeff Layton Signed-off-by: Sean Finney Signed-off-by: Pavel Shilovsky Signed-off-by: Steve French --- fs/cifs/connect.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index b6c6a3629b0..c7ebeee38c6 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -2937,6 +2937,24 @@ try_mount_again: (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE)); remote_path_check: +#ifdef CONFIG_CIFS_DFS_UPCALL + /* + * Perform an unconditional check for whether there are DFS + * referrals for this path without prefix, to provide support + * for DFS referrals from w2k8 servers which don't seem to respond + * with PATH_NOT_COVERED to requests that include the prefix. + * Chase the referral if found, otherwise continue normally. + */ + if (referral_walks_count == 0) { + int refrc = expand_dfs_referral(xid, pSesInfo, volume_info, + cifs_sb, &mount_data, false); + if (!refrc) { + referral_walks_count++; + goto try_mount_again; + } + } +#endif + /* check if a whole path (including prepath) is not remote */ if (!rc && tcon) { /* build_path_to_root works only when we have a valid tcon */ -- 2.11.4.GIT