74 lines
1.2 KiB
C
74 lines
1.2 KiB
C
/* Copyright (C) 2003 Russ Cox, Massachusetts Institute of Technology */
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/* See COPYRIGHT */
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#include <u.h>
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#include <libc.h>
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#include <fcall.h>
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#include <9pclient.h>
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#include "fsimpl.h"
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static long
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_fspwrite(CFid *fid, void *buf, long n, vlong offset)
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{
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Fcall tx, rx;
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void *freep;
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tx.type = Twrite;
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tx.fid = fid->fid;
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if(offset == -1){
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qlock(&fid->lk);
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tx.offset = fid->offset;
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qunlock(&fid->lk);
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}else
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tx.offset = offset;
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tx.count = n;
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tx.data = buf;
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if(_fsrpc(fid->fs, &tx, &rx, &freep) < 0)
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return -1;
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if(rx.type == Rerror){
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werrstr("%s", rx.ename);
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free(freep);
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return -1;
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}
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if(offset == -1 && rx.count){
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qlock(&fid->lk);
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fid->offset += rx.count;
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qunlock(&fid->lk);
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}
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free(freep);
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return rx.count;
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}
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long
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fspwrite(CFid *fid, void *buf, long n, vlong offset)
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{
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long tot, want, got, first;
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uint msize;
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msize = fid->fs->msize - IOHDRSZ;
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tot = 0;
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first = 1;
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while(tot < n || first){
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want = n - tot;
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if(want > msize)
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want = msize;
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got = _fspwrite(fid, buf, want, offset);
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first = 0;
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if(got < 0){
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if(tot == 0)
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return got;
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break;
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}
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tot += got;
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if(offset != -1)
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offset += got;
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}
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return tot;
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}
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long
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fswrite(CFid *fid, void *buf, long n)
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{
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return fspwrite(fid, buf, n, -1);
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}
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