cifs: remove legacy MultiuserMount option

We've now warned about this for two releases. Remove it for 3.5.
Signed-off-by: Jeff Layton <jlayton@redhat.com>

fs/cifs/README

@@ -608,11 +608,6 @@ Stats			Lists summary resource usage information as well as per
 			in the kernel configuration.
 
 Configuration pseudo-files:
-MultiuserMount		If set to one, more than one CIFS session to 
-			the same server ip address can be established
-			if more than one uid accesses the same mount
-			point and if the uids user/password mapping
-			information is available. (default is 0)
 PacketSigningEnabled	If set to one, cifs packet signing is enabled
 			and will be used if the server requires 
 			it.  If set to two, cifs packet signing is

fs/cifs/cifs_debug.c

@@ -420,7 +420,6 @@ static struct proc_dir_entry *proc_fs_cifs;
 static const struct file_operations cifsFYI_proc_fops;
 static const struct file_operations cifs_lookup_cache_proc_fops;
 static const struct file_operations traceSMB_proc_fops;
-static const struct file_operations cifs_multiuser_mount_proc_fops;
 static const struct file_operations cifs_security_flags_proc_fops;
 static const struct file_operations cifs_linux_ext_proc_fops;
 
@@ -440,8 +439,6 @@ cifs_proc_init(void)
 	proc_create("traceSMB", 0, proc_fs_cifs, &traceSMB_proc_fops);
 	proc_create("LinuxExtensionsEnabled", 0, proc_fs_cifs,
 		    &cifs_linux_ext_proc_fops);
-	proc_create("MultiuserMount", 0, proc_fs_cifs,
-		    &cifs_multiuser_mount_proc_fops);
 	proc_create("SecurityFlags", 0, proc_fs_cifs,
 		    &cifs_security_flags_proc_fops);
 	proc_create("LookupCacheEnabled", 0, proc_fs_cifs,
@@ -460,7 +457,6 @@ cifs_proc_clean(void)
 #ifdef CONFIG_CIFS_STATS
 	remove_proc_entry("Stats", proc_fs_cifs);
 #endif
-	remove_proc_entry("MultiuserMount", proc_fs_cifs);
 	remove_proc_entry("SecurityFlags", proc_fs_cifs);
 	remove_proc_entry("LinuxExtensionsEnabled", proc_fs_cifs);
 	remove_proc_entry("LookupCacheEnabled", proc_fs_cifs);
@@ -617,52 +613,6 @@ static const struct file_operations traceSMB_proc_fops = {
 	.write		= traceSMB_proc_write,
 };
 
-static int cifs_multiuser_mount_proc_show(struct seq_file *m, void *v)
-{
-	seq_printf(m, "%d\n", multiuser_mount);
-	return 0;
-}
-
-static int cifs_multiuser_mount_proc_open(struct inode *inode, struct file *fh)
-{
-	return single_open(fh, cifs_multiuser_mount_proc_show, NULL);
-}
-
-static ssize_t cifs_multiuser_mount_proc_write(struct file *file,
-		const char __user *buffer, size_t count, loff_t *ppos)
-{
-	char c;
-	int rc;
-	static bool warned;
-
-	rc = get_user(c, buffer);
-	if (rc)
-		return rc;
-	if (c == '0' || c == 'n' || c == 'N')
-		multiuser_mount = 0;
-	else if (c == '1' || c == 'y' || c == 'Y') {
-		multiuser_mount = 1;
-		if (!warned) {
-			warned = true;
-			printk(KERN_WARNING "CIFS VFS: The legacy multiuser "
-				"mount code is scheduled to be deprecated in "
-				"3.5. Please switch to using the multiuser "
-				"mount option.");
-		}
-	}
-
-	return count;
-}
-
-static const struct file_operations cifs_multiuser_mount_proc_fops = {
-	.owner		= THIS_MODULE,
-	.open		= cifs_multiuser_mount_proc_open,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= single_release,
-	.write		= cifs_multiuser_mount_proc_write,
-};
-
 static int cifs_security_flags_proc_show(struct seq_file *m, void *v)
 {
 	seq_printf(m, "0x%x\n", global_secflags);

fs/cifs/cifsfs.c

@@ -56,7 +56,6 @@ int traceSMB = 0;
 bool enable_oplocks = true;
 unsigned int linuxExtEnabled = 1;
 unsigned int lookupCacheEnabled = 1;
-unsigned int multiuser_mount = 0;
 unsigned int global_secflags = CIFSSEC_DEF;
 /* unsigned int ntlmv2_support = 0; */
 unsigned int sign_CIFS_PDUs = 1;

fs/cifs/cifsglob.h

@@ -1042,12 +1042,7 @@ GLOBAL_EXTERN atomic_t smBufAllocCount;
 GLOBAL_EXTERN atomic_t midCount;
 
 /* Misc globals */
-GLOBAL_EXTERN unsigned int multiuser_mount; /* if enabled allows new sessions
-				to be established on existing mount if we
-				have the uid/password or Kerberos credential
-				or equivalent for current user */
-/* enable or disable oplocks */
-GLOBAL_EXTERN bool enable_oplocks;
+GLOBAL_EXTERN bool enable_oplocks; /* enable or disable oplocks */
 GLOBAL_EXTERN unsigned int lookupCacheEnabled;
 GLOBAL_EXTERN unsigned int global_secflags;	/* if on, session setup sent
 				with more secure ntlmssp2 challenge/resp */

fs/cifs/misc.c

@@ -306,8 +306,6 @@ header_assemble(struct smb_hdr *buffer, char smb_command /* command */ ,
 		const struct cifs_tcon *treeCon, int word_count
 		/* length of fixed section (word count) in two byte units  */)
 {
-	struct list_head *temp_item;
-	struct cifs_ses *ses;
 	char *temp = (char *) buffer;
 
 	memset(temp, 0, 256); /* bigger than MAX_CIFS_HDR_SIZE */
@@ -337,51 +335,6 @@ header_assemble(struct smb_hdr *buffer, char smb_command /* command */ ,
 			/* Uid is not converted */
 			buffer->Uid = treeCon->ses->Suid;
 			buffer->Mid = GetNextMid(treeCon->ses->server);
-			if (multiuser_mount != 0) {
-		/* For the multiuser case, there are few obvious technically  */
-		/* possible mechanisms to match the local linux user (uid)    */
-		/* to a valid remote smb user (smb_uid):		      */
-		/* 	1) Query Winbind (or other local pam/nss daemon       */
-		/* 	  for userid/password/logon_domain or credential      */
-		/*      2) Query Winbind for uid to sid to username mapping   */
-		/* 	   and see if we have a matching password for existing*/
-		/*         session for that user perhas getting password by   */
-		/*         adding a new pam_cifs module that stores passwords */
-		/*         so that the cifs vfs can get at that for all logged*/
-		/*	   on users					      */
-		/*	3) (Which is the mechanism we have chosen)	      */
-		/*	   Search through sessions to the same server for a   */
-		/*	   a match on the uid that was passed in on mount     */
-		/*         with the current processes uid (or euid?) and use  */
-		/* 	   that smb uid.   If no existing smb session for     */
-		/* 	   that uid found, use the default smb session ie     */
-		/*         the smb session for the volume mounted which is    */
-		/* 	   the same as would be used if the multiuser mount   */
-		/* 	   flag were disabled.  */
-
-		/*  BB Add support for establishing new tCon and SMB Session  */
-		/*      with userid/password pairs found on the smb session   */
-		/*	for other target tcp/ip addresses 		BB    */
-				if (current_fsuid() != treeCon->ses->linux_uid) {
-					cFYI(1, "Multiuser mode and UID "
-						 "did not match tcon uid");
-					spin_lock(&cifs_tcp_ses_lock);
-					list_for_each(temp_item, &treeCon->ses->server->smb_ses_list) {
-						ses = list_entry(temp_item, struct cifs_ses, smb_ses_list);
-						if (ses->linux_uid == current_fsuid()) {
-							if (ses->server == treeCon->ses->server) {
-								cFYI(1, "found matching uid substitute right smb_uid");
-								buffer->Uid = ses->Suid;
-								break;
-							} else {
-				/* BB eventually call cifs_setup_session here */
-								cFYI(1, "local UID found but no smb sess with this server exists");
-							}
-						}
-					}
-					spin_unlock(&cifs_tcp_ses_lock);
-				}
-			}
 		}
 		if (treeCon->Flags & SMB_SHARE_IS_IN_DFS)
 			buffer->Flags2 |= SMBFLG2_DFS;