1 d3df3087 2003-12-06 devnull /* Copyright (C) 2003 Russ Cox, Massachusetts Institute of Technology */
 2 d3df3087 2003-12-06 devnull /* See COPYRIGHT */
 3 d3df3087 2003-12-06 devnull 
 4 d3df3087 2003-12-06 devnull #include <u.h>
 5 d3df3087 2003-12-06 devnull #include <libc.h>
 6 d3df3087 2003-12-06 devnull #include <fcall.h>
 7 d3df3087 2003-12-06 devnull #include <fs.h>
 8 d3df3087 2003-12-06 devnull #include "fsimpl.h"
 9 d3df3087 2003-12-06 devnull 
10 5a8e63b2 2004-02-29 devnull static long
11 5a8e63b2 2004-02-29 devnull _fspwrite(Fid *fid, void *buf, long n, vlong offset)
12 d3df3087 2003-12-06 devnull {
13 d3df3087 2003-12-06 devnull 	Fcall tx, rx;
14 d3df3087 2003-12-06 devnull 	void *freep;
15 d3df3087 2003-12-06 devnull 
16 ceb04770 2003-12-09 devnull 	tx.type = Twrite;
17 ceb04770 2003-12-09 devnull 	tx.fid = fid->fid;
18 d3df3087 2003-12-06 devnull 	if(offset == -1){
19 ceb04770 2003-12-09 devnull 		qlock(&fid->lk);
20 ceb04770 2003-12-09 devnull 		tx.offset = fid->offset;
21 ceb04770 2003-12-09 devnull 		qunlock(&fid->lk);
22 d3df3087 2003-12-06 devnull 	}else
23 d3df3087 2003-12-06 devnull 		tx.offset = offset;
24 d3df3087 2003-12-06 devnull 	tx.count = n;
25 d3df3087 2003-12-06 devnull 	tx.data = buf;
26 d3df3087 2003-12-06 devnull 
27 15680d56 2004-03-05 devnull 	if(fsrpc(fid->fs, &tx, &rx, &freep) < 0)
28 15680d56 2004-03-05 devnull 		return -1;
29 d3df3087 2003-12-06 devnull 	if(rx.type == Rerror){
30 d3df3087 2003-12-06 devnull 		werrstr("%s", rx.ename);
31 d3df3087 2003-12-06 devnull 		free(freep);
32 d3df3087 2003-12-06 devnull 		return -1;
33 d3df3087 2003-12-06 devnull 	}
34 ceb04770 2003-12-09 devnull 	if(offset == -1 && rx.count){
35 ceb04770 2003-12-09 devnull 		qlock(&fid->lk);
36 ceb04770 2003-12-09 devnull 		fid->offset += rx.count;
37 ceb04770 2003-12-09 devnull 		qunlock(&fid->lk);
38 ceb04770 2003-12-09 devnull 	}
39 d3df3087 2003-12-06 devnull 	free(freep);
40 d3df3087 2003-12-06 devnull 	return rx.count;
41 d3df3087 2003-12-06 devnull }
42 d3df3087 2003-12-06 devnull 
43 d3df3087 2003-12-06 devnull long
44 5a8e63b2 2004-02-29 devnull fspwrite(Fid *fid, void *buf, long n, vlong offset)
45 5a8e63b2 2004-02-29 devnull {
46 493f3d0f 2004-10-22 devnull 	long tot, want, got, first;
47 5a8e63b2 2004-02-29 devnull 	uint msize;
48 5a8e63b2 2004-02-29 devnull 
49 5a8e63b2 2004-02-29 devnull 	msize = fid->fs->msize - IOHDRSZ;
50 5a8e63b2 2004-02-29 devnull 	tot = 0;
51 493f3d0f 2004-10-22 devnull 	first = 1;
52 493f3d0f 2004-10-22 devnull 	while(tot < n || first){
53 5a8e63b2 2004-02-29 devnull 		want = n - tot;
54 5a8e63b2 2004-02-29 devnull 		if(want > msize)
55 5a8e63b2 2004-02-29 devnull 			want = msize;
56 5a8e63b2 2004-02-29 devnull 		got = _fspwrite(fid, buf, want, offset);
57 493f3d0f 2004-10-22 devnull 		first = 0;
58 5a8e63b2 2004-02-29 devnull 		if(got < 0){
59 5a8e63b2 2004-02-29 devnull 			if(tot == 0)
60 5a8e63b2 2004-02-29 devnull 				return got;
61 5a8e63b2 2004-02-29 devnull 			break;
62 5a8e63b2 2004-02-29 devnull 		}
63 5a8e63b2 2004-02-29 devnull 		tot += got;
64 5a8e63b2 2004-02-29 devnull 		if(offset != -1)
65 5a8e63b2 2004-02-29 devnull 			offset += got;
66 5a8e63b2 2004-02-29 devnull 	}
67 5a8e63b2 2004-02-29 devnull 	return tot;
68 5a8e63b2 2004-02-29 devnull }
69 5a8e63b2 2004-02-29 devnull 
70 5a8e63b2 2004-02-29 devnull long
71 ceb04770 2003-12-09 devnull fswrite(Fid *fid, void *buf, long n)
72 d3df3087 2003-12-06 devnull {
73 ceb04770 2003-12-09 devnull 	return fspwrite(fid, buf, n, -1);
74 d3df3087 2003-12-06 devnull }