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ip/cifsd: implement SMB_SET_FILE_UNIX_BASIC for wstat

--- a/sys/src/cmd/ip/cifsd/smb.c

+++ b/sys/src/cmd/ip/cifsd/smb.c

@@ -1232,7 +1232,7 @@

 setfilepathinformation(Req *r, Dir *d, File *f, char *path, int level, uchar *b, uchar *p, uchar *e)

 {

 	int attr, adt, atm, mdt, mtm, delete;

-	vlong len, atime, mtime;

+	vlong len, ctime, atime, mtime, mode;

 	Dir nd;

 	nulldir(&nd);

@@ -1280,6 +1280,22 @@

 			return STATUS_OS2_INVALID_ACCESS;

 		if(len != -1LL)

 			nd.length = len;

+		break;

+

+	case 0x0200:	/* SMB_SET_FILE_UNIX_BASIC */

+		if(!unpack(b, p, e, "v________vvv____________________________________________v________",

+			&len, &ctime, &atime, &mtime, &mode))

+			goto unsup;

+		if(len != -1LL)

+			nd.length = len;

+		if(atime && atime != -1LL)

+			nd.atime = fromfiletime(atime);

+		if(mtime && mtime != -1LL)

+			nd.mtime = fromfiletime(mtime);

+		else if(ctime && ctime != -1LL)

+			nd.mtime = fromfiletime(ctime);

+		if(mode != -1LL)

+			nd.mode = (d->mode & ~0777) | (mode & 0777);

 		break;

 	default: