File system stuff.
diff --git a/src/libfs/write.c b/src/libfs/write.c
new file mode 100644
index 0000000..96ecfa8
--- /dev/null
+++ b/src/libfs/write.c
@@ -0,0 +1,46 @@
+/* Copyright (C) 2003 Russ Cox, Massachusetts Institute of Technology */
+/* See COPYRIGHT */
+
+#include <u.h>
+#include <libc.h>
+#include <fcall.h>
+#include <fs.h>
+#include "fsimpl.h"
+
+long
+fspwrite(Fid *fd, void *buf, long n, vlong offset)
+{
+ Fcall tx, rx;
+ void *freep;
+
+ tx.type = Tread;
+ if(offset == -1){
+ qlock(&fd->lk);
+ tx.offset = fd->offset;
+ fd->offset += n;
+ qunlock(&fd->lk);
+ }else
+ tx.offset = offset;
+ tx.count = n;
+ tx.data = buf;
+
+ fsrpc(fd->fs, &tx, &rx, &freep);
+ if(rx.type == Rerror){
+ if(offset == -1){
+ qlock(&fd->lk);
+ fd->offset -= n;
+ qunlock(&fd->lk);
+ }
+ werrstr("%s", rx.ename);
+ free(freep);
+ return -1;
+ }
+ free(freep);
+ return rx.count;
+}
+
+long
+fswrite(Fid *fd, void *buf, long n)
+{
+ return fspwrite(fd, buf, n, -1);
+}
