cifs: Fix querying and creating MF symlinks over SMB1

Old SMB1 servers without CAP_NT_SMBS do not support CIFS_open() function
and instead SMBLegacyOpen() needs to be used. This logic is already handled
in cifs_open_file() function, which is server->ops->open callback function.

So for querying and creating MF symlinks use open callback function instead
of CIFS_open() function directly.

This change fixes querying and creating new MF symlinks on Windows 98.
Currently cifs_query_mf_symlink() is not able to detect MF symlink and
cifs_create_mf_symlink() is failing with EIO error.

Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>

Author: pali

fs/smb/client/link.c

@@ -258,7 +258,7 @@ cifs_query_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
 	struct cifs_open_parms oparms;
 	struct cifs_io_parms io_parms = {0};
 	int buf_type = CIFS_NO_BUFFER;
-	FILE_ALL_INFO file_info;
+	struct cifs_open_info_data query_data;
 
 	oparms = (struct cifs_open_parms) {
 		.tcon = tcon,
@@ -270,11 +270,11 @@ cifs_query_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
 		.fid = &fid,
 	};
 
-	rc = CIFS_open(xid, &oparms, &oplock, &file_info);
+	rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, &query_data);
 	if (rc)
 		return rc;
 
-	if (file_info.EndOfFile != cpu_to_le64(CIFS_MF_SYMLINK_FILE_SIZE)) {
+	if (query_data.fi.EndOfFile != cpu_to_le64(CIFS_MF_SYMLINK_FILE_SIZE)) {
 		rc = -ENOENT;
 		/* it's not a symlink */
 		goto out;
@@ -313,7 +313,7 @@ cifs_create_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
 		.fid = &fid,
 	};
 
-	rc = CIFS_open(xid, &oparms, &oplock, NULL);
+	rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, NULL);
 	if (rc)
 		return rc;