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 <jlayton@redhat.com> Signed-off-by: Sean Finney <seanius@seanius.net> Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <sfrench@us.ibm.com>
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@ -2937,6 +2937,24 @@ try_mount_again:
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(tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
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remote_path_check:
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#ifdef CONFIG_CIFS_DFS_UPCALL
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/*
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* Perform an unconditional check for whether there are DFS
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* referrals for this path without prefix, to provide support
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* for DFS referrals from w2k8 servers which don't seem to respond
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* with PATH_NOT_COVERED to requests that include the prefix.
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* Chase the referral if found, otherwise continue normally.
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*/
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if (referral_walks_count == 0) {
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int refrc = expand_dfs_referral(xid, pSesInfo, volume_info,
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cifs_sb, &mount_data, false);
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if (!refrc) {
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referral_walks_count++;
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goto try_mount_again;
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}
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}
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#endif
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/* check if a whole path (including prepath) is not remote */
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if (!rc && tcon) {
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/* build_path_to_root works only when we have a valid tcon */
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