smb311: Add support for SMB311 query info (non-compounded)

Add worker function for non-compounded SMB3.1.1 POSIX Extensions query info.
This is needed for revalidate of root (cached) directory for example.
Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Reviewed-by: Aurelien Aptel <aaptel@suse.com>

fs/cifs/smb2pdu.c

@@ -3458,6 +3458,19 @@ int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
 			  NULL);
 }
 
+int
+SMB311_posix_query_info(const unsigned int xid, struct cifs_tcon *tcon,
+		u64 persistent_fid, u64 volatile_fid, struct smb311_posix_qinfo *data, u32 *plen)
+{
+	size_t output_len = sizeof(struct smb311_posix_qinfo *) +
+			(sizeof(struct cifs_sid) * 2) + (PATH_MAX * 2);
+	*plen = 0;
+
+	return query_info(xid, tcon, persistent_fid, volatile_fid,
+			  SMB_FIND_FILE_POSIX_INFO, SMB2_O_INFO_FILE, 0,
+			  output_len, sizeof(struct smb311_posix_qinfo), (void **)&data, plen);
+}
+
 int
 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
 		u64 persistent_fid, u64 volatile_fid,

fs/cifs/smb2proto.h

@@ -182,6 +182,8 @@ extern int SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst,
 			   struct TCP_Server_Info *server,
 			   u64 persistent_file_id, u64 volatile_file_id);
 extern void SMB2_flush_free(struct smb_rqst *rqst);
+extern int SMB311_posix_query_info(const unsigned int xid, struct cifs_tcon *tcon,
+		u64 persistent_fid, u64 volatile_fid, struct smb311_posix_qinfo *data, u32 *plen);
 extern int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
 			   u64 persistent_file_id, u64 volatile_file_id,
 			   struct smb2_file_all_info *data);