cifs: returning mount parm processing errors correctly

During additional testing of the updated cifs.ko with the
new mount API support, we found a few additional cases where
we were logging errors, but not returning them to the user.

For example:
   a) invalid security mechanisms
   b) invalid cache options
   c) unsupported rdma
   d) invalid smb dialect requested

Fixes: 24e0a1e ("cifs: switch to new mount api")
Acked-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

Author: smfrench

fs/cifs/fs_context.c

@@ -533,7 +533,7 @@ static int smb3_fs_context_validate(struct fs_context *fc)
 
 	if (ctx->rdma && ctx->vals->protocol_id < SMB30_PROT_ID) {
 		cifs_dbg(VFS, "SMB Direct requires Version >=3.0\n");
-		return -1;
+		return -EOPNOTSUPP;
 	}
 
 #ifndef CONFIG_KEYS
@@ -556,7 +556,7 @@ static int smb3_fs_context_validate(struct fs_context *fc)
 	/* make sure UNC has a share name */
 	if (strlen(ctx->UNC) < 3 || !strchr(ctx->UNC + 3, '\\')) {
 		cifs_dbg(VFS, "Malformed UNC. Unable to find share name.\n");
-		return -1;
+		return -ENOENT;
 	}
 
 	if (!ctx->got_ip) {
@@ -570,7 +570,7 @@ static int smb3_fs_context_validate(struct fs_context *fc)
 		if (!cifs_convert_address((struct sockaddr *)&ctx->dstaddr,
 					  &ctx->UNC[2], len)) {
 			pr_err("Unable to determine destination address\n");
-			return -1;
+			return -EHOSTUNREACH;
 		}
 	}
 
@@ -1265,7 +1265,7 @@ static int smb3_fs_context_parse_param(struct fs_context *fc,
 	return 0;
 
  cifs_parse_mount_err:
-	return 1;
+	return -EINVAL;
 }
 
 int smb3_init_fs_context(struct fs_context *fc)