smb: client: introduce ->parse_reparse_point()

Parse reparse point into cifs_open_info_data structure and feed it
through cifs_open_info_to_fattr().
Signed-off-by: Paulo Alcantara (SUSE) <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/smb/client/cifsglob.h

@@ -395,8 +395,7 @@ struct smb_version_operations {
 			     struct cifs_tcon *tcon,
 			     struct cifs_sb_info *cifs_sb,
 			     const char *full_path,
-			     char **target_path,
-			     struct kvec *rsp_iov);
+			     char **target_path);
 	/* open a file for non-posix mounts */
 	int (*open)(const unsigned int xid, struct cifs_open_parms *oparms, __u32 *oplock,
 		    void *buf);
@@ -551,6 +550,9 @@ struct smb_version_operations {
 	bool (*is_status_io_timeout)(char *buf);
 	/* Check for STATUS_NETWORK_NAME_DELETED */
 	bool (*is_network_name_deleted)(char *buf, struct TCP_Server_Info *srv);
+	int (*parse_reparse_point)(struct cifs_sb_info *cifs_sb,
+				   struct kvec *rsp_iov,
+				   struct cifs_open_info_data *data);
 };
 
 struct smb_version_values {

fs/smb/client/inode.c

@@ -459,8 +459,7 @@ static int cifs_get_unix_fattr(const unsigned char *full_path,
 			return -EOPNOTSUPP;
 		rc = server->ops->query_symlink(xid, tcon,
 						cifs_sb, full_path,
-						&fattr->cf_symlink_target,
-						NULL);
+						&fattr->cf_symlink_target);
 		cifs_dbg(FYI, "%s: query_symlink: %d\n", __func__, rc);
 	}
 	return rc;
@@ -1035,22 +1034,28 @@ static int reparse_info_to_fattr(struct cifs_open_info_data *data,
 		if (!rc)
 			iov = &rsp_iov;
 	}
+
+	rc = -EOPNOTSUPP;
 	switch ((data->reparse_tag = tag)) {
 	case 0: /* SMB1 symlink */
-		iov = NULL;
-		fallthrough;
-	case IO_REPARSE_TAG_NFS:
-	case IO_REPARSE_TAG_SYMLINK:
-		if (!data->symlink_target && server->ops->query_symlink) {
+		if (server->ops->query_symlink) {
 			rc = server->ops->query_symlink(xid, tcon,
 							cifs_sb, full_path,
-							&data->symlink_target,
-							iov);
+							&data->symlink_target);
 		}
 		break;
 	case IO_REPARSE_TAG_MOUNT_POINT:
 		cifs_create_junction_fattr(fattr, sb);
+		rc = 0;
 		goto out;
+	default:
+		if (data->symlink_target) {
+			rc = 0;
+		} else if (server->ops->parse_reparse_point) {
+			rc = server->ops->parse_reparse_point(cifs_sb,
+							      iov, data);
+		}
+		break;
 	}
 
 	cifs_open_info_to_fattr(fattr, data, sb);

fs/smb/client/smb1ops.c

@@ -976,32 +976,36 @@ static int cifs_query_symlink(const unsigned int xid,
 			      struct cifs_tcon *tcon,
 			      struct cifs_sb_info *cifs_sb,
 			      const char *full_path,
-			      char **target_path,
-			      struct kvec *rsp_iov)
+			      char **target_path)
 {
-	struct reparse_data_buffer *buf;
-	TRANSACT_IOCTL_RSP *io = rsp_iov->iov_base;
-	bool unicode = !!(io->hdr.Flags2 & SMBFLG2_UNICODE);
-	u32 plen = le16_to_cpu(io->ByteCount);
 	int rc;
 
 	cifs_tcon_dbg(FYI, "%s: path=%s\n", __func__, full_path);
 
-	/* Check for unix extensions */
-	if (cap_unix(tcon->ses)) {
-		rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, target_path,
-					     cifs_sb->local_nls,
-					     cifs_remap(cifs_sb));
-		if (rc == -EREMOTE)
-			rc = cifs_unix_dfs_readlink(xid, tcon, full_path,
-						    target_path,
-						    cifs_sb->local_nls);
-		return rc;
-	}
+	if (!cap_unix(tcon->ses))
+		return -EOPNOTSUPP;
+
+	rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, target_path,
+				     cifs_sb->local_nls, cifs_remap(cifs_sb));
+	if (rc == -EREMOTE)
+		rc = cifs_unix_dfs_readlink(xid, tcon, full_path,
+					    target_path, cifs_sb->local_nls);
+	return rc;
+}
+
+static int cifs_parse_reparse_point(struct cifs_sb_info *cifs_sb,
+				    struct kvec *rsp_iov,
+				    struct cifs_open_info_data *data)
+{
+	struct reparse_data_buffer *buf;
+	TRANSACT_IOCTL_RSP *io = rsp_iov->iov_base;
+	bool unicode = !!(io->hdr.Flags2 & SMBFLG2_UNICODE);
+	u32 plen = le16_to_cpu(io->ByteCount);
 
 	buf = (struct reparse_data_buffer *)((__u8 *)&io->hdr.Protocol +
 					     le32_to_cpu(io->DataOffset));
-	return parse_reparse_point(buf, plen, cifs_sb, unicode, target_path);
+	return parse_reparse_point(buf, plen, cifs_sb, unicode,
+				   &data->symlink_target);
 }
 
 static bool
@@ -1200,6 +1204,7 @@ struct smb_version_operations smb1_operations = {
 	.rename = CIFSSMBRename,
 	.create_hardlink = CIFSCreateHardLink,
 	.query_symlink = cifs_query_symlink,
+	.parse_reparse_point = cifs_parse_reparse_point,
 	.open = cifs_open_file,
 	.set_fid = cifs_set_fid,
 	.close = cifs_close_file,

fs/smb/client/smb2ops.c

@@ -2949,6 +2949,12 @@ int parse_reparse_point(struct reparse_data_buffer *buf,
 		return parse_reparse_symlink(
 			(struct reparse_symlink_data_buffer *)buf,
 			plen, unicode, target_path, cifs_sb);
+	case IO_REPARSE_TAG_LX_SYMLINK:
+	case IO_REPARSE_TAG_AF_UNIX:
+	case IO_REPARSE_TAG_LX_FIFO:
+	case IO_REPARSE_TAG_LX_CHR:
+	case IO_REPARSE_TAG_LX_BLK:
+		return 0;
 	default:
 		cifs_dbg(VFS, "srv returned unknown symlink buffer tag:0x%08x\n",
 			 le32_to_cpu(buf->ReparseTag));
@@ -2956,22 +2962,18 @@ int parse_reparse_point(struct reparse_data_buffer *buf,
 	}
 }
 
-static int smb2_query_symlink(const unsigned int xid,
-			      struct cifs_tcon *tcon,
-			      struct cifs_sb_info *cifs_sb,
-			      const char *full_path,
-			      char **target_path,
-			      struct kvec *rsp_iov)
+static int smb2_parse_reparse_point(struct cifs_sb_info *cifs_sb,
+				    struct kvec *rsp_iov,
+				    struct cifs_open_info_data *data)
 {
 	struct reparse_data_buffer *buf;
 	struct smb2_ioctl_rsp *io = rsp_iov->iov_base;
 	u32 plen = le32_to_cpu(io->OutputCount);
 
-	cifs_tcon_dbg(FYI, "%s: path: %s\n", __func__, full_path);
-
 	buf = (struct reparse_data_buffer *)((u8 *)io +
 					     le32_to_cpu(io->OutputOffset));
-	return parse_reparse_point(buf, plen, cifs_sb, true, target_path);
+	return parse_reparse_point(buf, plen, cifs_sb,
+				   true, &data->symlink_target);
 }
 
 static int smb2_query_reparse_point(const unsigned int xid,
@@ -5206,7 +5208,7 @@ struct smb_version_operations smb20_operations = {
 	.unlink = smb2_unlink,
 	.rename = smb2_rename_path,
 	.create_hardlink = smb2_create_hardlink,
-	.query_symlink = smb2_query_symlink,
+	.parse_reparse_point = smb2_parse_reparse_point,
 	.query_mf_symlink = smb3_query_mf_symlink,
 	.create_mf_symlink = smb3_create_mf_symlink,
 	.open = smb2_open_file,
@@ -5308,7 +5310,7 @@ struct smb_version_operations smb21_operations = {
 	.unlink = smb2_unlink,
 	.rename = smb2_rename_path,
 	.create_hardlink = smb2_create_hardlink,
-	.query_symlink = smb2_query_symlink,
+	.parse_reparse_point = smb2_parse_reparse_point,
 	.query_mf_symlink = smb3_query_mf_symlink,
 	.create_mf_symlink = smb3_create_mf_symlink,
 	.open = smb2_open_file,
@@ -5413,7 +5415,7 @@ struct smb_version_operations smb30_operations = {
 	.unlink = smb2_unlink,
 	.rename = smb2_rename_path,
 	.create_hardlink = smb2_create_hardlink,
-	.query_symlink = smb2_query_symlink,
+	.parse_reparse_point = smb2_parse_reparse_point,
 	.query_mf_symlink = smb3_query_mf_symlink,
 	.create_mf_symlink = smb3_create_mf_symlink,
 	.open = smb2_open_file,
@@ -5527,7 +5529,7 @@ struct smb_version_operations smb311_operations = {
 	.unlink = smb2_unlink,
 	.rename = smb2_rename_path,
 	.create_hardlink = smb2_create_hardlink,
-	.query_symlink = smb2_query_symlink,
+	.parse_reparse_point = smb2_parse_reparse_point,
 	.query_mf_symlink = smb3_query_mf_symlink,
 	.create_mf_symlink = smb3_create_mf_symlink,
 	.open = smb2_open_file,