[CIFS] Allow null user connections

Some servers are configured to only allow null user mounts for
guest access.  Allow nul user (anonymous) mounts e.g.
	mount -t cifs //server/share /mnt -o username=

Signed-off-by: Steve French <sfrench@us.ibm.com>

2 files changed, 9 insertions, 1 deletions

diff --git a/fs/cifs/CHANGES b/fs/cifs/CHANGES
index 1eb9a2ec0a3b..50afab81a59b 100644
--- a/fs/cifs/CHANGES
+++ b/fs/cifs/CHANGES
@@ -1,6 +1,9 @@
 Version 1.46
 ------------
 Support deep tree mounts.  Better support OS/2, Win9x (DOS) time stamps.
+Allow null user to be specified on mount ("username="). Do not return
+EINVAL on readdir when filldir fails due to overwritten blocksize
+(fixes FC problem)
 
 Version 1.45
 ------------
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 4093d5332930..71f77914ce93 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -822,10 +822,13 @@ cifs_parse_mount_options(char *options, const char *devname,struct smb_vol *vol)
                 } else if (strnicmp(data, "nouser_xattr",12) == 0) {
                         vol->no_xattr = 1;
                 } else if (strnicmp(data, "user", 4) == 0) {
-                        if (!value || !*value) {
+                        if (!value) {
                                 printk(KERN_WARNING
                                        "CIFS: invalid or missing username\n");
                                 return 1;       /* needs_arg; */
+                        } else if(!*value) {
+                                /* null user, ie anonymous, authentication */
+                                vol->nullauth = 1;
                         }
                         if (strnlen(value, 200) < 200) {
                                 vol->username = value;
@@ -1642,6 +1645,8 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
                 /* BB fixme parse for domain name here */
                 cFYI(1, ("Username: %s ", volume_info.username));
 
+        } else if (volume_info.nullauth) {
+                cFYI(1,("null user"));
         } else {
                 cifserror("No username specified");
         /* In userspace mount helper we can get user name from alternate