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 Signed-off-by: Sean Finney <[email protected]> --- fs/cifs/connect.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 50 insertions(+), 0 deletions(-) diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index 96544a4..7e4ca38 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -2874,6 +2874,56 @@ 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 + * some limited support for domain DFS referrals on w2k8 + */ + if (referral_walks_count == 0) { + cFYI(1, "Getting referral for: %s", volume_info->UNC); + rc = get_dfs_path(xid, pSesInfo , volume_info->UNC + 1, + cifs_sb->local_nls, &num_referrals, &referrals, + cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); + if (!rc && num_referrals > 0) { + char *fake_devname = NULL; + + full_path = build_unc_path_to_root(volume_info, + cifs_sb); + if (IS_ERR(full_path)) { + rc = PTR_ERR(full_path); + goto mount_fail_check; + } + + if (mount_data != mount_data_global) + kfree(mount_data); + + mount_data = cifs_compose_mount_options( + cifs_sb->mountdata, full_path + 1, + referrals, &fake_devname); + + free_dfs_info_array(referrals, num_referrals); + kfree(fake_devname); + + if (IS_ERR(mount_data)) { + rc = PTR_ERR(mount_data); + mount_data = NULL; + goto mount_fail_check; + } + + if (tcon) + cifs_put_tcon(tcon); + else if (pSesInfo) + cifs_put_smb_ses(pSesInfo); + + cleanup_volume_info(&volume_info); + referral_walks_count++; + FreeXid(xid); + 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 */ -- 1.7.2.3 -- To unsubscribe from this list: send the line "unsubscribe linux-cifs" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
