Merge tag '5.11-rc7-smb3-github' of git://github.com/smfrench/smb3-kernel

Pull cifs fixes from Steve French:
 "Four small smb3 fixes to the new mount API (including a particularly
  important one for DFS links).

  These were found in testing this week of additional DFS scenarios, and
  a user testing of an apache container problem"

* tag '5.11-rc7-smb3-github' of git://github.com/smfrench/smb3-kernel:
  cifs: Set CIFS_MOUNT_USE_PREFIX_PATH flag on setting cifs_sb->prepath.
  cifs: In the new mount api we get the full devname as source=
  cifs: do not disable noperm if multiuser mount option is not provided
  cifs: fix dfs-links

Author: torvalds

fs/cifs/cifsfs.c

@@ -469,7 +469,7 @@ cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
 static int cifs_show_devname(struct seq_file *m, struct dentry *root)
 {
 	struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
-	char *devname = kstrdup(cifs_sb->ctx->UNC, GFP_KERNEL);
+	char *devname = kstrdup(cifs_sb->ctx->source, GFP_KERNEL);
 
 	if (devname == NULL)
 		seq_puts(m, "none");

fs/cifs/connect.c

@@ -2756,6 +2756,7 @@ int cifs_setup_cifs_sb(struct cifs_sb_info *cifs_sb)
 		cifs_sb->prepath = kstrdup(ctx->prepath, GFP_KERNEL);
 		if (cifs_sb->prepath == NULL)
 			return -ENOMEM;
+		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
 	}
 
 	return 0;
@@ -2983,6 +2984,14 @@ expand_dfs_referral(const unsigned int xid, struct cifs_ses *ses,
 			rc = PTR_ERR(mdata);
 			mdata = NULL;
 		} else {
+			/*
+			 * We can not clear out the whole structure since we
+			 * no longer have an explicit function to parse
+			 * a mount-string. Instead we need to clear out the
+			 * individual fields that are no longer valid.
+			 */
+			kfree(ctx->prepath);
+			ctx->prepath = NULL;
 			rc = cifs_setup_volume_info(ctx, mdata, fake_devname);
 		}
 		kfree(fake_devname);

fs/cifs/fs_context.c

@@ -148,7 +148,6 @@ const struct fs_parameter_spec smb3_fs_parameters[] = {
 
 	/* Mount options which take string value */
 	fsparam_string("source", Opt_source),
-	fsparam_string("unc", Opt_source),
 	fsparam_string("user", Opt_user),
 	fsparam_string("username", Opt_user),
 	fsparam_string("pass", Opt_pass),
@@ -178,6 +177,11 @@ const struct fs_parameter_spec smb3_fs_parameters[] = {
 	fsparam_flag_no("auto", Opt_ignore),
 	fsparam_string("cred", Opt_ignore),
 	fsparam_string("credentials", Opt_ignore),
+	/*
+	 * UNC and prefixpath is now extracted from Opt_source
+	 * in the new mount API so we can just ignore them going forward.
+	 */
+	fsparam_string("unc", Opt_ignore),
 	fsparam_string("prefixpath", Opt_ignore),
 	{}
 };
@@ -313,6 +317,7 @@ smb3_fs_context_dup(struct smb3_fs_context *new_ctx, struct smb3_fs_context *ctx
 	new_ctx->password = NULL;
 	new_ctx->domainname = NULL;
 	new_ctx->UNC = NULL;
+	new_ctx->source = NULL;
 	new_ctx->iocharset = NULL;
 
 	/*
@@ -323,6 +328,7 @@ smb3_fs_context_dup(struct smb3_fs_context *new_ctx, struct smb3_fs_context *ctx
 	DUP_CTX_STR(username);
 	DUP_CTX_STR(password);
 	DUP_CTX_STR(UNC);
+	DUP_CTX_STR(source);
 	DUP_CTX_STR(domainname);
 	DUP_CTX_STR(nodename);
 	DUP_CTX_STR(iocharset);
@@ -732,6 +738,7 @@ static int smb3_reconfigure(struct fs_context *fc)
 	 * just use what we already have in cifs_sb->ctx.
 	 */
 	STEAL_STRING(cifs_sb, ctx, UNC);
+	STEAL_STRING(cifs_sb, ctx, source);
 	STEAL_STRING(cifs_sb, ctx, username);
 	STEAL_STRING(cifs_sb, ctx, password);
 	STEAL_STRING(cifs_sb, ctx, domainname);
@@ -974,6 +981,11 @@ static int smb3_fs_context_parse_param(struct fs_context *fc,
 			cifs_dbg(VFS, "Unknown error parsing devname\n");
 			goto cifs_parse_mount_err;
 		}
+		ctx->source = kstrdup(param->string, GFP_KERNEL);
+		if (ctx->source == NULL) {
+			cifs_dbg(VFS, "OOM when copying UNC string\n");
+			goto cifs_parse_mount_err;
+		}
 		fc->source = kstrdup(param->string, GFP_KERNEL);
 		if (fc->source == NULL) {
 			cifs_dbg(VFS, "OOM when copying UNC string\n");
@@ -1396,6 +1408,8 @@ smb3_cleanup_fs_context_contents(struct smb3_fs_context *ctx)
 	ctx->password = NULL;
 	kfree(ctx->UNC);
 	ctx->UNC = NULL;
+	kfree(ctx->source);
+	ctx->source = NULL;
 	kfree(ctx->domainname);
 	ctx->domainname = NULL;
 	kfree(ctx->nodename);
@@ -1533,8 +1547,8 @@ void smb3_update_mnt_flags(struct cifs_sb_info *cifs_sb)
 		cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
 					    CIFS_MOUNT_NO_PERM);
 	else
-		cifs_sb->mnt_cifs_flags &= ~(CIFS_MOUNT_MULTIUSER |
-					     CIFS_MOUNT_NO_PERM);
+		cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_MULTIUSER;
+
 
 	if (ctx->strict_io)
 		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;

fs/cifs/fs_context.h

@@ -159,6 +159,7 @@ struct smb3_fs_context {
 	char *username;
 	char *password;
 	char *domainname;
+	char *source;
 	char *UNC;
 	char *nodename;
 	char *iocharset;  /* local code page for mapping to and from Unicode */