1 b8c14089 2003-11-23 devnull #include <u.h>
2 b8c14089 2003-11-23 devnull #include <libc.h>
3 b8c14089 2003-11-23 devnull #include <bio.h>
4 b8c14089 2003-11-23 devnull #include <regexp.h>
5 b8c14089 2003-11-23 devnull #include <thread.h>
6 b8c14089 2003-11-23 devnull #include <fcall.h>
7 b8c14089 2003-11-23 devnull #include <plumb.h>
8 b8c14089 2003-11-23 devnull #include "plumber.h"
12 32f69c36 2003-12-11 devnull Stack = 32*1024
15 b8c14089 2003-11-23 devnull typedef struct Dirtab Dirtab;
16 b8c14089 2003-11-23 devnull typedef struct Fid Fid;
17 b8c14089 2003-11-23 devnull typedef struct Holdq Holdq;
18 b8c14089 2003-11-23 devnull typedef struct Readreq Readreq;
19 b8c14089 2003-11-23 devnull typedef struct Sendreq Sendreq;
21 b8c14089 2003-11-23 devnull struct Dirtab
23 b8c14089 2003-11-23 devnull char *name;
24 b8c14089 2003-11-23 devnull uchar type;
25 b8c14089 2003-11-23 devnull uint qid;
26 b8c14089 2003-11-23 devnull uint perm;
27 b8c14089 2003-11-23 devnull int nopen; /* #fids open on this port */
28 b8c14089 2003-11-23 devnull Fid *fopen;
29 b8c14089 2003-11-23 devnull Holdq *holdq;
30 b8c14089 2003-11-23 devnull Readreq *readq;
31 b8c14089 2003-11-23 devnull Sendreq *sendq;
34 b8c14089 2003-11-23 devnull struct Fid
37 b8c14089 2003-11-23 devnull int busy;
38 b8c14089 2003-11-23 devnull int open;
39 b8c14089 2003-11-23 devnull int mode;
41 b8c14089 2003-11-23 devnull Dirtab *dir;
42 b8c14089 2003-11-23 devnull long offset; /* zeroed at beginning of each message, read or write */
43 b8c14089 2003-11-23 devnull char *writebuf; /* partial message written so far; offset tells how much */
44 b8c14089 2003-11-23 devnull Fid *next;
45 b8c14089 2003-11-23 devnull Fid *nextopen;
48 b8c14089 2003-11-23 devnull struct Readreq
50 b8c14089 2003-11-23 devnull Fid *fid;
51 b8c14089 2003-11-23 devnull Fcall *fcall;
52 b8c14089 2003-11-23 devnull uchar *buf;
53 b8c14089 2003-11-23 devnull Readreq *next;
56 b8c14089 2003-11-23 devnull struct Sendreq
58 b8c14089 2003-11-23 devnull int nfid; /* number of fids that should receive this message */
59 b8c14089 2003-11-23 devnull int nleft; /* number left that haven't received it */
60 b8c14089 2003-11-23 devnull Fid **fid; /* fid[nfid] */
61 b8c14089 2003-11-23 devnull Plumbmsg *msg;
62 b8c14089 2003-11-23 devnull char *pack; /* plumbpack()ed message */
63 b8c14089 2003-11-23 devnull int npack; /* length of pack */
64 b8c14089 2003-11-23 devnull Sendreq *next;
67 b8c14089 2003-11-23 devnull struct Holdq
69 b8c14089 2003-11-23 devnull Plumbmsg *msg;
70 b8c14089 2003-11-23 devnull Holdq *next;
73 b8c14089 2003-11-23 devnull struct /* needed because incref() doesn't return value */
77 b8c14089 2003-11-23 devnull } rulesref;
81 b8c14089 2003-11-23 devnull NDIR = 50,
82 b8c14089 2003-11-23 devnull Nhash = 16,
84 b8c14089 2003-11-23 devnull Qdir = 0,
85 b8c14089 2003-11-23 devnull Qrules = 1,
86 b8c14089 2003-11-23 devnull Qsend = 2,
87 b8c14089 2003-11-23 devnull Qport = 3,
88 b8c14089 2003-11-23 devnull NQID = Qport
91 b8c14089 2003-11-23 devnull static Dirtab dir[NDIR] =
93 b8c14089 2003-11-23 devnull { ".", QTDIR, Qdir, 0500|DMDIR },
94 b8c14089 2003-11-23 devnull { "rules", QTFILE, Qrules, 0600 },
95 b8c14089 2003-11-23 devnull { "send", QTFILE, Qsend, 0200 },
97 b8c14089 2003-11-23 devnull static int ndir = NQID;
99 b8c14089 2003-11-23 devnull static int srvfd;
100 b8c14089 2003-11-23 devnull static int clock;
101 b8c14089 2003-11-23 devnull static Fid *fids[Nhash];
102 b8c14089 2003-11-23 devnull static QLock readlock;
103 b8c14089 2003-11-23 devnull static QLock queue;
104 b8c14089 2003-11-23 devnull static int messagesize = 8192+IOHDRSZ; /* good start */
106 b8c14089 2003-11-23 devnull static void fsysproc(void*);
107 b8c14089 2003-11-23 devnull static void fsysrespond(Fcall*, uchar*, char*);
108 b8c14089 2003-11-23 devnull static Fid* newfid(int);
110 b8c14089 2003-11-23 devnull static Fcall* fsysflush(Fcall*, uchar*, Fid*);
111 b8c14089 2003-11-23 devnull static Fcall* fsysversion(Fcall*, uchar*, Fid*);
112 b8c14089 2003-11-23 devnull static Fcall* fsysauth(Fcall*, uchar*, Fid*);
113 b8c14089 2003-11-23 devnull static Fcall* fsysattach(Fcall*, uchar*, Fid*);
114 b8c14089 2003-11-23 devnull static Fcall* fsyswalk(Fcall*, uchar*, Fid*);
115 b8c14089 2003-11-23 devnull static Fcall* fsysopen(Fcall*, uchar*, Fid*);
116 b8c14089 2003-11-23 devnull static Fcall* fsyscreate(Fcall*, uchar*, Fid*);
117 b8c14089 2003-11-23 devnull static Fcall* fsysread(Fcall*, uchar*, Fid*);
118 b8c14089 2003-11-23 devnull static Fcall* fsyswrite(Fcall*, uchar*, Fid*);
119 b8c14089 2003-11-23 devnull static Fcall* fsysclunk(Fcall*, uchar*, Fid*);
120 b8c14089 2003-11-23 devnull static Fcall* fsysremove(Fcall*, uchar*, Fid*);
121 b8c14089 2003-11-23 devnull static Fcall* fsysstat(Fcall*, uchar*, Fid*);
122 b8c14089 2003-11-23 devnull static Fcall* fsyswstat(Fcall*, uchar*, Fid*);
124 b8c14089 2003-11-23 devnull Fcall* (*fcall[Tmax])(Fcall*, uchar*, Fid*) =
126 b8c14089 2003-11-23 devnull [Tflush] = fsysflush,
127 b8c14089 2003-11-23 devnull [Tversion] = fsysversion,
128 b8c14089 2003-11-23 devnull [Tauth] = fsysauth,
129 b8c14089 2003-11-23 devnull [Tattach] = fsysattach,
130 b8c14089 2003-11-23 devnull [Twalk] = fsyswalk,
131 b8c14089 2003-11-23 devnull [Topen] = fsysopen,
132 b8c14089 2003-11-23 devnull [Tcreate] = fsyscreate,
133 b8c14089 2003-11-23 devnull [Tread] = fsysread,
134 b8c14089 2003-11-23 devnull [Twrite] = fsyswrite,
135 b8c14089 2003-11-23 devnull [Tclunk] = fsysclunk,
136 b8c14089 2003-11-23 devnull [Tremove]= fsysremove,
137 b8c14089 2003-11-23 devnull [Tstat] = fsysstat,
138 b8c14089 2003-11-23 devnull [Twstat] = fsyswstat,
141 b8c14089 2003-11-23 devnull char Ebadfcall[] = "bad fcall type";
142 b8c14089 2003-11-23 devnull char Eperm[] = "permission denied";
143 b8c14089 2003-11-23 devnull char Enomem[] = "malloc failed for buffer";
144 b8c14089 2003-11-23 devnull char Enotdir[] = "not a directory";
145 b8c14089 2003-11-23 devnull char Enoexist[] = "plumb file does not exist";
146 b8c14089 2003-11-23 devnull char Eisdir[] = "file is a directory";
147 b8c14089 2003-11-23 devnull char Ebadmsg[] = "bad plumb message format";
148 b8c14089 2003-11-23 devnull char Enosuchport[] ="no such plumb port";
149 b8c14089 2003-11-23 devnull char Enoport[] = "couldn't find destination for message";
150 b8c14089 2003-11-23 devnull char Einuse[] = "file already open";
153 b8c14089 2003-11-23 devnull * Add new port. A no-op if port already exists or is the null string
156 b8c14089 2003-11-23 devnull addport(char *port)
160 b8c14089 2003-11-23 devnull if(port == nil)
162 b8c14089 2003-11-23 devnull for(i=NQID; i<ndir; i++)
163 b8c14089 2003-11-23 devnull if(strcmp(port, dir[i].name) == 0)
165 b8c14089 2003-11-23 devnull if(i == NDIR){
166 b8c14089 2003-11-23 devnull fprint(2, "plumb: too many ports; max %d\n", NDIR);
170 b8c14089 2003-11-23 devnull dir[i].name = estrdup(port);
171 b8c14089 2003-11-23 devnull dir[i].qid = i;
172 b8c14089 2003-11-23 devnull dir[i].perm = 0400;
173 b8c14089 2003-11-23 devnull nports++;
174 b8c14089 2003-11-23 devnull ports = erealloc(ports, nports*sizeof(char*));
175 b8c14089 2003-11-23 devnull ports[nports-1] = dir[i].name;
178 b8c14089 2003-11-23 devnull static ulong
179 b8c14089 2003-11-23 devnull getclock(void)
181 32f69c36 2003-12-11 devnull return time(0);
185 b8c14089 2003-11-23 devnull startfsys(void)
187 32f69c36 2003-12-11 devnull int p[2];
189 b8c14089 2003-11-23 devnull fmtinstall('F', fcallfmt);
190 b8c14089 2003-11-23 devnull clock = getclock();
191 b8c14089 2003-11-23 devnull if(pipe(p) < 0)
192 b8c14089 2003-11-23 devnull error("can't create pipe: %r");
193 b8c14089 2003-11-23 devnull /* 0 will be server end, 1 will be client end */
194 b8c14089 2003-11-23 devnull srvfd = p[0];
195 32f69c36 2003-12-11 devnull if(post9pservice(p[1], "plumb") < 0)
196 32f69c36 2003-12-11 devnull sysfatal("post9pservice plumb: %r");
197 b8c14089 2003-11-23 devnull close(p[1]);
198 f063dad9 2004-02-29 devnull threadcreate(fsysproc, nil, Stack);
201 b8c14089 2003-11-23 devnull static void
202 32f69c36 2003-12-11 devnull fsysproc(void *v)
205 b8c14089 2003-11-23 devnull Fcall *t;
207 b8c14089 2003-11-23 devnull uchar *buf;
209 32f69c36 2003-12-11 devnull USED(v);
210 b8c14089 2003-11-23 devnull t = nil;
211 b8c14089 2003-11-23 devnull for(;;){
212 b8c14089 2003-11-23 devnull buf = malloc(messagesize); /* avoid memset of emalloc */
213 b8c14089 2003-11-23 devnull if(buf == nil)
214 b8c14089 2003-11-23 devnull error("malloc failed: %r");
215 b8c14089 2003-11-23 devnull qlock(&readlock);
216 f063dad9 2004-02-29 devnull n = threadread9pmsg(srvfd, buf, messagesize);
217 b8c14089 2003-11-23 devnull if(n <= 0){
218 b8c14089 2003-11-23 devnull if(n < 0)
219 b8c14089 2003-11-23 devnull error("i/o error on server channel");
220 b8c14089 2003-11-23 devnull threadexitsall("unmounted");
222 b8c14089 2003-11-23 devnull if(readlock.head == nil) /* no other processes waiting to read; start one */
223 f063dad9 2004-02-29 devnull threadcreate(fsysproc, nil, Stack);
224 b8c14089 2003-11-23 devnull qunlock(&readlock);
225 b8c14089 2003-11-23 devnull if(t == nil)
226 b8c14089 2003-11-23 devnull t = emalloc(sizeof(Fcall));
227 b8c14089 2003-11-23 devnull if(convM2S(buf, n, t) != n)
228 b8c14089 2003-11-23 devnull error("convert error in convM2S");
229 32f69c36 2003-12-11 devnull if(debug)
230 b8c14089 2003-11-23 devnull fprint(2, "<= %F\n", t);
231 b8c14089 2003-11-23 devnull if(fcall[t->type] == nil)
232 b8c14089 2003-11-23 devnull fsysrespond(t, buf, Ebadfcall);
234 b8c14089 2003-11-23 devnull if(t->type==Tversion || t->type==Tauth)
235 b8c14089 2003-11-23 devnull f = nil;
237 b8c14089 2003-11-23 devnull f = newfid(t->fid);
238 b8c14089 2003-11-23 devnull t = (*fcall[t->type])(t, buf, f);
243 b8c14089 2003-11-23 devnull static void
244 b8c14089 2003-11-23 devnull fsysrespond(Fcall *t, uchar *buf, char *err)
248 b8c14089 2003-11-23 devnull if(err){
249 b8c14089 2003-11-23 devnull t->type = Rerror;
250 b8c14089 2003-11-23 devnull t->ename = err;
252 b8c14089 2003-11-23 devnull t->type++;
253 b8c14089 2003-11-23 devnull if(buf == nil)
254 b8c14089 2003-11-23 devnull buf = emalloc(messagesize);
255 b8c14089 2003-11-23 devnull n = convS2M(t, buf, messagesize);
256 b8c14089 2003-11-23 devnull if(n < 0)
257 b8c14089 2003-11-23 devnull error("convert error in convS2M");
258 b8c14089 2003-11-23 devnull if(write(srvfd, buf, n) != n)
259 b8c14089 2003-11-23 devnull error("write error in respond");
260 32f69c36 2003-12-11 devnull if(debug)
261 b8c14089 2003-11-23 devnull fprint(2, "=> %F\n", t);
262 b8c14089 2003-11-23 devnull free(buf);
267 b8c14089 2003-11-23 devnull newfid(int fid)
269 b8c14089 2003-11-23 devnull Fid *f, *ff, **fh;
271 b8c14089 2003-11-23 devnull qlock(&queue);
272 b8c14089 2003-11-23 devnull ff = nil;
273 b8c14089 2003-11-23 devnull fh = &fids[fid&(Nhash-1)];
274 b8c14089 2003-11-23 devnull for(f=*fh; f; f=f->next)
275 b8c14089 2003-11-23 devnull if(f->fid == fid)
276 b8c14089 2003-11-23 devnull goto Return;
277 b8c14089 2003-11-23 devnull else if(ff==nil && !f->busy)
280 b8c14089 2003-11-23 devnull ff->fid = fid;
282 b8c14089 2003-11-23 devnull goto Return;
284 b8c14089 2003-11-23 devnull f = emalloc(sizeof *f);
285 b8c14089 2003-11-23 devnull f->fid = fid;
286 b8c14089 2003-11-23 devnull f->next = *fh;
287 b8c14089 2003-11-23 devnull *fh = f;
289 b8c14089 2003-11-23 devnull qunlock(&queue);
290 b8c14089 2003-11-23 devnull return f;
293 b8c14089 2003-11-23 devnull static uint
294 b8c14089 2003-11-23 devnull dostat(Dirtab *dir, uchar *buf, uint nbuf, uint clock)
298 b8c14089 2003-11-23 devnull d.qid.type = dir->type;
299 b8c14089 2003-11-23 devnull d.qid.path = dir->qid;
300 b8c14089 2003-11-23 devnull d.qid.vers = 0;
301 b8c14089 2003-11-23 devnull d.mode = dir->perm;
302 b8c14089 2003-11-23 devnull d.length = 0; /* would be nice to do better */
303 b8c14089 2003-11-23 devnull d.name = dir->name;
304 b8c14089 2003-11-23 devnull d.uid = user;
305 b8c14089 2003-11-23 devnull d.gid = user;
306 b8c14089 2003-11-23 devnull d.muid = user;
307 b8c14089 2003-11-23 devnull d.atime = clock;
308 b8c14089 2003-11-23 devnull d.mtime = clock;
309 b8c14089 2003-11-23 devnull return convD2M(&d, buf, nbuf);
312 b8c14089 2003-11-23 devnull static void
313 b8c14089 2003-11-23 devnull queuesend(Dirtab *d, Plumbmsg *m)
315 b8c14089 2003-11-23 devnull Sendreq *s, *t;
319 b8c14089 2003-11-23 devnull s = emalloc(sizeof(Sendreq));
320 b8c14089 2003-11-23 devnull s->nfid = d->nopen;
321 b8c14089 2003-11-23 devnull s->nleft = s->nfid;
322 b8c14089 2003-11-23 devnull s->fid = emalloc(s->nfid*sizeof(Fid*));
324 b8c14089 2003-11-23 devnull /* build array of fids open on this channel */
325 b8c14089 2003-11-23 devnull for(f=d->fopen; f!=nil; f=f->nextopen)
326 b8c14089 2003-11-23 devnull s->fid[i++] = f;
327 b8c14089 2003-11-23 devnull s->msg = m;
328 b8c14089 2003-11-23 devnull s->next = nil;
329 b8c14089 2003-11-23 devnull /* link to end of queue; drainqueue() searches in sender order so this implements a FIFO */
330 b8c14089 2003-11-23 devnull for(t=d->sendq; t!=nil; t=t->next)
331 b8c14089 2003-11-23 devnull if(t->next == nil)
333 b8c14089 2003-11-23 devnull if(t == nil)
334 b8c14089 2003-11-23 devnull d->sendq = s;
336 b8c14089 2003-11-23 devnull t->next = s;
339 b8c14089 2003-11-23 devnull static void
340 b8c14089 2003-11-23 devnull queueread(Dirtab *d, Fcall *t, uchar *buf, Fid *f)
342 b8c14089 2003-11-23 devnull Readreq *r;
344 b8c14089 2003-11-23 devnull r = emalloc(sizeof(Readreq));
345 b8c14089 2003-11-23 devnull r->fcall = t;
346 b8c14089 2003-11-23 devnull r->buf = buf;
347 b8c14089 2003-11-23 devnull r->fid = f;
348 b8c14089 2003-11-23 devnull r->next = d->readq;
349 b8c14089 2003-11-23 devnull d->readq = r;
352 b8c14089 2003-11-23 devnull static void
353 b8c14089 2003-11-23 devnull drainqueue(Dirtab *d)
355 b8c14089 2003-11-23 devnull Readreq *r, *nextr, *prevr;
356 b8c14089 2003-11-23 devnull Sendreq *s, *nexts, *prevs;
357 b8c14089 2003-11-23 devnull int i, n;
359 b8c14089 2003-11-23 devnull prevs = nil;
360 b8c14089 2003-11-23 devnull for(s=d->sendq; s!=nil; s=nexts){
361 b8c14089 2003-11-23 devnull nexts = s->next;
362 b8c14089 2003-11-23 devnull for(i=0; i<s->nfid; i++){
363 b8c14089 2003-11-23 devnull prevr = nil;
364 b8c14089 2003-11-23 devnull for(r=d->readq; r!=nil; r=nextr){
365 b8c14089 2003-11-23 devnull nextr = r->next;
366 b8c14089 2003-11-23 devnull if(r->fid == s->fid[i]){
367 b8c14089 2003-11-23 devnull /* pack the message if necessary */
368 b8c14089 2003-11-23 devnull if(s->pack == nil)
369 b8c14089 2003-11-23 devnull s->pack = plumbpack(s->msg, &s->npack);
370 b8c14089 2003-11-23 devnull /* exchange the stuff... */
371 b8c14089 2003-11-23 devnull r->fcall->data = s->pack+r->fid->offset;
372 b8c14089 2003-11-23 devnull n = s->npack - r->fid->offset;
373 b8c14089 2003-11-23 devnull if(n > messagesize-IOHDRSZ)
374 b8c14089 2003-11-23 devnull n = messagesize-IOHDRSZ;
375 b8c14089 2003-11-23 devnull if(n > r->fcall->count)
376 b8c14089 2003-11-23 devnull n = r->fcall->count;
377 b8c14089 2003-11-23 devnull r->fcall->count = n;
378 b8c14089 2003-11-23 devnull fsysrespond(r->fcall, r->buf, nil);
379 b8c14089 2003-11-23 devnull r->fid->offset += n;
380 b8c14089 2003-11-23 devnull if(r->fid->offset >= s->npack){
381 b8c14089 2003-11-23 devnull /* message transferred; delete this fid from send queue */
382 b8c14089 2003-11-23 devnull r->fid->offset = 0;
383 b8c14089 2003-11-23 devnull s->fid[i] = nil;
384 b8c14089 2003-11-23 devnull s->nleft--;
386 b8c14089 2003-11-23 devnull /* delete read request from queue */
387 b8c14089 2003-11-23 devnull if(prevr)
388 b8c14089 2003-11-23 devnull prevr->next = r->next;
390 b8c14089 2003-11-23 devnull d->readq = r->next;
391 b8c14089 2003-11-23 devnull free(r->fcall);
392 b8c14089 2003-11-23 devnull free(r);
395 b8c14089 2003-11-23 devnull prevr = r;
398 b8c14089 2003-11-23 devnull /* if no fids left, delete this send from queue */
399 b8c14089 2003-11-23 devnull if(s->nleft == 0){
400 b8c14089 2003-11-23 devnull free(s->fid);
401 b8c14089 2003-11-23 devnull plumbfree(s->msg);
402 b8c14089 2003-11-23 devnull free(s->pack);
403 b8c14089 2003-11-23 devnull if(prevs)
404 b8c14089 2003-11-23 devnull prevs->next = s->next;
406 b8c14089 2003-11-23 devnull d->sendq = s->next;
407 b8c14089 2003-11-23 devnull free(s);
409 b8c14089 2003-11-23 devnull prevs = s;
413 b8c14089 2003-11-23 devnull /* can't flush a send because they are always answered synchronously */
414 b8c14089 2003-11-23 devnull static void
415 b8c14089 2003-11-23 devnull flushqueue(Dirtab *d, int oldtag)
417 b8c14089 2003-11-23 devnull Readreq *r, *prevr;
419 b8c14089 2003-11-23 devnull prevr = nil;
420 b8c14089 2003-11-23 devnull for(r=d->readq; r!=nil; r=r->next){
421 b8c14089 2003-11-23 devnull if(oldtag == r->fcall->tag){
422 b8c14089 2003-11-23 devnull /* delete read request from queue */
423 b8c14089 2003-11-23 devnull if(prevr)
424 b8c14089 2003-11-23 devnull prevr->next = r->next;
426 b8c14089 2003-11-23 devnull d->readq = r->next;
427 b8c14089 2003-11-23 devnull free(r->fcall);
428 b8c14089 2003-11-23 devnull free(r->buf);
429 b8c14089 2003-11-23 devnull free(r);
432 b8c14089 2003-11-23 devnull prevr = r;
436 b8c14089 2003-11-23 devnull /* remove messages awaiting delivery to now-closing fid */
437 b8c14089 2003-11-23 devnull static void
438 b8c14089 2003-11-23 devnull removesenders(Dirtab *d, Fid *fid)
440 b8c14089 2003-11-23 devnull Sendreq *s, *nexts, *prevs;
443 b8c14089 2003-11-23 devnull prevs = nil;
444 b8c14089 2003-11-23 devnull for(s=d->sendq; s!=nil; s=nexts){
445 b8c14089 2003-11-23 devnull nexts = s->next;
446 b8c14089 2003-11-23 devnull for(i=0; i<s->nfid; i++)
447 b8c14089 2003-11-23 devnull if(fid == s->fid[i]){
448 b8c14089 2003-11-23 devnull /* delete this fid from send queue */
449 b8c14089 2003-11-23 devnull s->fid[i] = nil;
450 b8c14089 2003-11-23 devnull s->nleft--;
453 b8c14089 2003-11-23 devnull /* if no fids left, delete this send from queue */
454 b8c14089 2003-11-23 devnull if(s->nleft == 0){
455 b8c14089 2003-11-23 devnull free(s->fid);
456 b8c14089 2003-11-23 devnull plumbfree(s->msg);
457 b8c14089 2003-11-23 devnull free(s->pack);
458 b8c14089 2003-11-23 devnull if(prevs)
459 b8c14089 2003-11-23 devnull prevs->next = s->next;
461 b8c14089 2003-11-23 devnull d->sendq = s->next;
462 b8c14089 2003-11-23 devnull free(s);
464 b8c14089 2003-11-23 devnull prevs = s;
468 b8c14089 2003-11-23 devnull static void
469 b8c14089 2003-11-23 devnull hold(Plumbmsg *m, Dirtab *d)
471 b8c14089 2003-11-23 devnull Holdq *h, *q;
473 b8c14089 2003-11-23 devnull h = emalloc(sizeof(Holdq));
474 b8c14089 2003-11-23 devnull h->msg = m;
475 b8c14089 2003-11-23 devnull /* add to end of queue */
476 b8c14089 2003-11-23 devnull if(d->holdq == nil)
477 b8c14089 2003-11-23 devnull d->holdq = h;
479 b8c14089 2003-11-23 devnull for(q=d->holdq; q->next!=nil; q=q->next)
481 b8c14089 2003-11-23 devnull q->next = h;
485 b8c14089 2003-11-23 devnull static void
486 b8c14089 2003-11-23 devnull queueheld(Dirtab *d)
488 b8c14089 2003-11-23 devnull Holdq *h;
490 b8c14089 2003-11-23 devnull while(d->holdq != nil){
491 b8c14089 2003-11-23 devnull h = d->holdq;
492 b8c14089 2003-11-23 devnull d->holdq = h->next;
493 b8c14089 2003-11-23 devnull queuesend(d, h->msg);
494 b8c14089 2003-11-23 devnull /* no need to drain queue because we know no-one is reading yet */
495 b8c14089 2003-11-23 devnull free(h);
499 b8c14089 2003-11-23 devnull static void
500 b8c14089 2003-11-23 devnull dispose(Fcall *t, uchar *buf, Plumbmsg *m, Ruleset *rs, Exec *e)
503 b8c14089 2003-11-23 devnull char *err;
505 b8c14089 2003-11-23 devnull qlock(&queue);
506 b8c14089 2003-11-23 devnull err = nil;
507 b8c14089 2003-11-23 devnull if(m->dst==nil || m->dst[0]=='\0'){
508 b8c14089 2003-11-23 devnull err = Enoport;
509 b8c14089 2003-11-23 devnull if(rs != nil)
510 b8c14089 2003-11-23 devnull err = startup(rs, e);
511 b8c14089 2003-11-23 devnull plumbfree(m);
513 b8c14089 2003-11-23 devnull for(i=NQID; i<ndir; i++)
514 b8c14089 2003-11-23 devnull if(strcmp(m->dst, dir[i].name) == 0){
515 b8c14089 2003-11-23 devnull if(dir[i].nopen == 0){
516 b8c14089 2003-11-23 devnull err = startup(rs, e);
517 b8c14089 2003-11-23 devnull if(e!=nil && e->holdforclient)
518 b8c14089 2003-11-23 devnull hold(m, &dir[i]);
520 b8c14089 2003-11-23 devnull plumbfree(m);
522 b8c14089 2003-11-23 devnull queuesend(&dir[i], m);
523 b8c14089 2003-11-23 devnull drainqueue(&dir[i]);
527 b8c14089 2003-11-23 devnull freeexec(e);
528 b8c14089 2003-11-23 devnull qunlock(&queue);
529 b8c14089 2003-11-23 devnull fsysrespond(t, buf, err);
530 b8c14089 2003-11-23 devnull free(t);
533 b8c14089 2003-11-23 devnull static Fcall*
534 32f69c36 2003-12-11 devnull fsysversion(Fcall *t, uchar *buf, Fid *fid)
536 32f69c36 2003-12-11 devnull USED(fid);
538 b8c14089 2003-11-23 devnull if(t->msize < 256){
539 b8c14089 2003-11-23 devnull fsysrespond(t, buf, "version: message size too small");
540 b8c14089 2003-11-23 devnull return t;
542 b8c14089 2003-11-23 devnull if(t->msize < messagesize)
543 b8c14089 2003-11-23 devnull messagesize = t->msize;
544 b8c14089 2003-11-23 devnull t->msize = messagesize;
545 b8c14089 2003-11-23 devnull if(strncmp(t->version, "9P2000", 6) != 0){
546 b8c14089 2003-11-23 devnull fsysrespond(t, buf, "unrecognized 9P version");
547 b8c14089 2003-11-23 devnull return t;
549 b8c14089 2003-11-23 devnull t->version = "9P2000";
550 b8c14089 2003-11-23 devnull fsysrespond(t, buf, nil);
551 b8c14089 2003-11-23 devnull return t;
554 b8c14089 2003-11-23 devnull static Fcall*
555 32f69c36 2003-12-11 devnull fsysauth(Fcall *t, uchar *buf, Fid *fid)
557 32f69c36 2003-12-11 devnull USED(fid);
558 b8c14089 2003-11-23 devnull fsysrespond(t, buf, "plumber: authentication not required");
559 b8c14089 2003-11-23 devnull return t;
562 b8c14089 2003-11-23 devnull static Fcall*
563 b8c14089 2003-11-23 devnull fsysattach(Fcall *t, uchar *buf, Fid *f)
565 b8c14089 2003-11-23 devnull Fcall out;
567 b8c14089 2003-11-23 devnull if(strcmp(t->uname, user) != 0){
568 b8c14089 2003-11-23 devnull fsysrespond(&out, buf, Eperm);
569 b8c14089 2003-11-23 devnull return t;
571 b8c14089 2003-11-23 devnull f->busy = 1;
572 b8c14089 2003-11-23 devnull f->open = 0;
573 b8c14089 2003-11-23 devnull f->qid.type = QTDIR;
574 b8c14089 2003-11-23 devnull f->qid.path = Qdir;
575 b8c14089 2003-11-23 devnull f->qid.vers = 0;
576 b8c14089 2003-11-23 devnull f->dir = dir;
577 b8c14089 2003-11-23 devnull memset(&out, 0, sizeof(Fcall));
578 b8c14089 2003-11-23 devnull out.type = t->type;
579 b8c14089 2003-11-23 devnull out.tag = t->tag;
580 b8c14089 2003-11-23 devnull out.fid = f->fid;
581 b8c14089 2003-11-23 devnull out.qid = f->qid;
582 b8c14089 2003-11-23 devnull fsysrespond(&out, buf, nil);
583 b8c14089 2003-11-23 devnull return t;
586 b8c14089 2003-11-23 devnull static Fcall*
587 32f69c36 2003-12-11 devnull fsysflush(Fcall *t, uchar *buf, Fid *fid)
591 32f69c36 2003-12-11 devnull USED(fid);
592 b8c14089 2003-11-23 devnull qlock(&queue);
593 b8c14089 2003-11-23 devnull for(i=NQID; i<ndir; i++)
594 b8c14089 2003-11-23 devnull flushqueue(&dir[i], t->oldtag);
595 b8c14089 2003-11-23 devnull qunlock(&queue);
596 b8c14089 2003-11-23 devnull fsysrespond(t, buf, nil);
597 b8c14089 2003-11-23 devnull return t;
600 b8c14089 2003-11-23 devnull static Fcall*
601 b8c14089 2003-11-23 devnull fsyswalk(Fcall *t, uchar *buf, Fid *f)
603 b8c14089 2003-11-23 devnull Fcall out;
604 b8c14089 2003-11-23 devnull Fid *nf;
605 b8c14089 2003-11-23 devnull ulong path;
606 b8c14089 2003-11-23 devnull Dirtab *d, *dir;
609 b8c14089 2003-11-23 devnull uchar type;
610 b8c14089 2003-11-23 devnull char *err;
612 b8c14089 2003-11-23 devnull if(f->open){
613 b8c14089 2003-11-23 devnull fsysrespond(t, buf, "clone of an open fid");
614 b8c14089 2003-11-23 devnull return t;
617 b8c14089 2003-11-23 devnull nf = nil;
618 b8c14089 2003-11-23 devnull if(t->fid != t->newfid){
619 b8c14089 2003-11-23 devnull nf = newfid(t->newfid);
620 b8c14089 2003-11-23 devnull if(nf->busy){
621 b8c14089 2003-11-23 devnull fsysrespond(t, buf, "clone to a busy fid");
622 b8c14089 2003-11-23 devnull return t;
624 b8c14089 2003-11-23 devnull nf->busy = 1;
625 b8c14089 2003-11-23 devnull nf->open = 0;
626 b8c14089 2003-11-23 devnull nf->dir = f->dir;
627 b8c14089 2003-11-23 devnull nf->qid = f->qid;
628 b8c14089 2003-11-23 devnull f = nf; /* walk f */
631 b8c14089 2003-11-23 devnull out.nwqid = 0;
632 b8c14089 2003-11-23 devnull err = nil;
633 b8c14089 2003-11-23 devnull dir = f->dir;
634 b8c14089 2003-11-23 devnull q = f->qid;
636 b8c14089 2003-11-23 devnull if(t->nwname > 0){
637 b8c14089 2003-11-23 devnull for(i=0; i<t->nwname; i++){
638 b8c14089 2003-11-23 devnull if((q.type & QTDIR) == 0){
639 b8c14089 2003-11-23 devnull err = Enotdir;
642 b8c14089 2003-11-23 devnull if(strcmp(t->wname[i], "..") == 0){
643 b8c14089 2003-11-23 devnull type = QTDIR;
644 b8c14089 2003-11-23 devnull path = Qdir;
646 b8c14089 2003-11-23 devnull q.type = type;
647 b8c14089 2003-11-23 devnull q.vers = 0;
648 b8c14089 2003-11-23 devnull q.path = path;
649 b8c14089 2003-11-23 devnull out.wqid[out.nwqid++] = q;
650 b8c14089 2003-11-23 devnull continue;
652 b8c14089 2003-11-23 devnull d = dir;
653 b8c14089 2003-11-23 devnull d++; /* skip '.' */
654 b8c14089 2003-11-23 devnull for(; d->name; d++)
655 b8c14089 2003-11-23 devnull if(strcmp(t->wname[i], d->name) == 0){
656 b8c14089 2003-11-23 devnull type = d->type;
657 b8c14089 2003-11-23 devnull path = d->qid;
658 b8c14089 2003-11-23 devnull dir = d;
659 b8c14089 2003-11-23 devnull goto Accept;
661 b8c14089 2003-11-23 devnull err = Enoexist;
666 b8c14089 2003-11-23 devnull out.type = t->type;
667 b8c14089 2003-11-23 devnull out.tag = t->tag;
668 b8c14089 2003-11-23 devnull if(err!=nil || out.nwqid<t->nwname){
670 b8c14089 2003-11-23 devnull nf->busy = 0;
671 b8c14089 2003-11-23 devnull }else if(out.nwqid == t->nwname){
672 b8c14089 2003-11-23 devnull f->qid = q;
673 b8c14089 2003-11-23 devnull f->dir = dir;
676 b8c14089 2003-11-23 devnull fsysrespond(&out, buf, err);
677 b8c14089 2003-11-23 devnull return t;
680 b8c14089 2003-11-23 devnull static Fcall*
681 b8c14089 2003-11-23 devnull fsysopen(Fcall *t, uchar *buf, Fid *f)
683 b8c14089 2003-11-23 devnull int m, clearrules, mode;
685 b8c14089 2003-11-23 devnull clearrules = 0;
686 b8c14089 2003-11-23 devnull if(t->mode & OTRUNC){
687 b8c14089 2003-11-23 devnull if(f->qid.path != Qrules)
688 b8c14089 2003-11-23 devnull goto Deny;
689 b8c14089 2003-11-23 devnull clearrules = 1;
691 b8c14089 2003-11-23 devnull /* can't truncate anything, so just disregard */
692 b8c14089 2003-11-23 devnull mode = t->mode & ~(OTRUNC|OCEXEC);
693 b8c14089 2003-11-23 devnull /* can't execute or remove anything */
694 b8c14089 2003-11-23 devnull if(mode==OEXEC || (mode&ORCLOSE))
695 b8c14089 2003-11-23 devnull goto Deny;
696 b8c14089 2003-11-23 devnull switch(mode){
697 b8c14089 2003-11-23 devnull default:
698 b8c14089 2003-11-23 devnull goto Deny;
699 b8c14089 2003-11-23 devnull case OREAD:
700 b8c14089 2003-11-23 devnull m = 0400;
702 b8c14089 2003-11-23 devnull case OWRITE:
703 b8c14089 2003-11-23 devnull m = 0200;
705 b8c14089 2003-11-23 devnull case ORDWR:
706 b8c14089 2003-11-23 devnull m = 0600;
709 b8c14089 2003-11-23 devnull if(((f->dir->perm&~(DMDIR|DMAPPEND))&m) != m)
710 b8c14089 2003-11-23 devnull goto Deny;
711 b8c14089 2003-11-23 devnull if(f->qid.path==Qrules && (mode==OWRITE || mode==ORDWR)){
712 32f69c36 2003-12-11 devnull lock(&rulesref.lk);
713 b8c14089 2003-11-23 devnull if(rulesref.ref++ != 0){
714 b8c14089 2003-11-23 devnull rulesref.ref--;
715 32f69c36 2003-12-11 devnull unlock(&rulesref.lk);
716 b8c14089 2003-11-23 devnull fsysrespond(t, buf, Einuse);
717 b8c14089 2003-11-23 devnull return t;
719 32f69c36 2003-12-11 devnull unlock(&rulesref.lk);
721 b8c14089 2003-11-23 devnull if(clearrules){
722 b8c14089 2003-11-23 devnull writerules(nil, 0);
723 b8c14089 2003-11-23 devnull rules[0] = nil;
725 b8c14089 2003-11-23 devnull t->qid = f->qid;
726 b8c14089 2003-11-23 devnull t->iounit = 0;
727 b8c14089 2003-11-23 devnull qlock(&queue);
728 b8c14089 2003-11-23 devnull f->mode = mode;
729 b8c14089 2003-11-23 devnull f->open = 1;
730 b8c14089 2003-11-23 devnull f->dir->nopen++;
731 b8c14089 2003-11-23 devnull f->nextopen = f->dir->fopen;
732 b8c14089 2003-11-23 devnull f->dir->fopen = f;
733 b8c14089 2003-11-23 devnull queueheld(f->dir);
734 b8c14089 2003-11-23 devnull qunlock(&queue);
735 b8c14089 2003-11-23 devnull fsysrespond(t, buf, nil);
736 b8c14089 2003-11-23 devnull return t;
739 b8c14089 2003-11-23 devnull fsysrespond(t, buf, Eperm);
740 b8c14089 2003-11-23 devnull return t;
743 b8c14089 2003-11-23 devnull static Fcall*
744 32f69c36 2003-12-11 devnull fsyscreate(Fcall *t, uchar *buf, Fid *fid)
746 32f69c36 2003-12-11 devnull USED(fid);
747 b8c14089 2003-11-23 devnull fsysrespond(t, buf, Eperm);
748 b8c14089 2003-11-23 devnull return t;
751 b8c14089 2003-11-23 devnull static Fcall*
752 b8c14089 2003-11-23 devnull fsysreadrules(Fcall *t, uchar *buf)
754 b8c14089 2003-11-23 devnull char *p;
757 b8c14089 2003-11-23 devnull p = printrules();
758 b8c14089 2003-11-23 devnull n = strlen(p);
759 b8c14089 2003-11-23 devnull t->data = p;
760 b8c14089 2003-11-23 devnull if(t->offset >= n)
761 b8c14089 2003-11-23 devnull t->count = 0;
763 b8c14089 2003-11-23 devnull t->data = p+t->offset;
764 b8c14089 2003-11-23 devnull if(t->offset+t->count > n)
765 b8c14089 2003-11-23 devnull t->count = n-t->offset;
767 b8c14089 2003-11-23 devnull fsysrespond(t, buf, nil);
768 b8c14089 2003-11-23 devnull free(p);
769 b8c14089 2003-11-23 devnull return t;
772 b8c14089 2003-11-23 devnull static Fcall*
773 b8c14089 2003-11-23 devnull fsysread(Fcall *t, uchar *buf, Fid *f)
775 b8c14089 2003-11-23 devnull uchar *b;
776 b8c14089 2003-11-23 devnull int i, n, o, e;
777 b8c14089 2003-11-23 devnull uint len;
778 b8c14089 2003-11-23 devnull Dirtab *d;
779 b8c14089 2003-11-23 devnull uint clock;
781 b8c14089 2003-11-23 devnull if(f->qid.path != Qdir){
782 b8c14089 2003-11-23 devnull if(f->qid.path == Qrules)
783 b8c14089 2003-11-23 devnull return fsysreadrules(t, buf);
784 b8c14089 2003-11-23 devnull /* read from port */
785 b8c14089 2003-11-23 devnull if(f->qid.path < NQID){
786 b8c14089 2003-11-23 devnull fsysrespond(t, buf, "internal error: unknown read port");
787 b8c14089 2003-11-23 devnull return t;
789 b8c14089 2003-11-23 devnull qlock(&queue);
790 b8c14089 2003-11-23 devnull queueread(f->dir, t, buf, f);
791 b8c14089 2003-11-23 devnull drainqueue(f->dir);
792 b8c14089 2003-11-23 devnull qunlock(&queue);
793 b8c14089 2003-11-23 devnull return nil;
795 b8c14089 2003-11-23 devnull o = t->offset;
796 b8c14089 2003-11-23 devnull e = t->offset+t->count;
797 b8c14089 2003-11-23 devnull clock = getclock();
798 b8c14089 2003-11-23 devnull b = malloc(messagesize-IOHDRSZ);
799 b8c14089 2003-11-23 devnull if(b == nil){
800 b8c14089 2003-11-23 devnull fsysrespond(t, buf, Enomem);
801 b8c14089 2003-11-23 devnull return t;
804 b8c14089 2003-11-23 devnull d = dir;
805 b8c14089 2003-11-23 devnull d++; /* first entry is '.' */
806 b8c14089 2003-11-23 devnull for(i=0; d->name!=nil && i<e; i+=len){
807 b8c14089 2003-11-23 devnull len = dostat(d, b+n, messagesize-IOHDRSZ-n, clock);
808 b8c14089 2003-11-23 devnull if(len <= BIT16SZ)
810 b8c14089 2003-11-23 devnull if(i >= o)
811 b8c14089 2003-11-23 devnull n += len;
814 b8c14089 2003-11-23 devnull t->data = (char*)b;
815 b8c14089 2003-11-23 devnull t->count = n;
816 b8c14089 2003-11-23 devnull fsysrespond(t, buf, nil);
817 b8c14089 2003-11-23 devnull free(b);
818 b8c14089 2003-11-23 devnull return t;
821 b8c14089 2003-11-23 devnull static Fcall*
822 b8c14089 2003-11-23 devnull fsyswrite(Fcall *t, uchar *buf, Fid *f)
824 b8c14089 2003-11-23 devnull Plumbmsg *m;
825 b8c14089 2003-11-23 devnull int i, n;
826 b8c14089 2003-11-23 devnull long count;
827 b8c14089 2003-11-23 devnull char *data;
828 b8c14089 2003-11-23 devnull Exec *e;
830 b8c14089 2003-11-23 devnull switch((int)f->qid.path){
831 b8c14089 2003-11-23 devnull case Qdir:
832 b8c14089 2003-11-23 devnull fsysrespond(t, buf, Eisdir);
833 b8c14089 2003-11-23 devnull return t;
834 b8c14089 2003-11-23 devnull case Qrules:
835 b8c14089 2003-11-23 devnull clock = getclock();
836 b8c14089 2003-11-23 devnull fsysrespond(t, buf, writerules(t->data, t->count));
837 b8c14089 2003-11-23 devnull return t;
838 b8c14089 2003-11-23 devnull case Qsend:
839 b8c14089 2003-11-23 devnull if(f->offset == 0){
840 b8c14089 2003-11-23 devnull data = t->data;
841 b8c14089 2003-11-23 devnull count = t->count;
843 b8c14089 2003-11-23 devnull /* partial message already assembled */
844 b8c14089 2003-11-23 devnull f->writebuf = erealloc(f->writebuf, f->offset + t->count);
845 b8c14089 2003-11-23 devnull memmove(f->writebuf+f->offset, t->data, t->count);
846 b8c14089 2003-11-23 devnull data = f->writebuf;
847 b8c14089 2003-11-23 devnull count = f->offset+t->count;
849 b8c14089 2003-11-23 devnull m = plumbunpackpartial(data, count, &n);
850 b8c14089 2003-11-23 devnull if(m == nil){
851 b8c14089 2003-11-23 devnull if(n == 0){
852 b8c14089 2003-11-23 devnull f->offset = 0;
853 b8c14089 2003-11-23 devnull free(f->writebuf);
854 b8c14089 2003-11-23 devnull f->writebuf = nil;
855 b8c14089 2003-11-23 devnull fsysrespond(t, buf, Ebadmsg);
856 b8c14089 2003-11-23 devnull return t;
858 b8c14089 2003-11-23 devnull /* can read more... */
859 b8c14089 2003-11-23 devnull if(f->offset == 0){
860 b8c14089 2003-11-23 devnull f->writebuf = emalloc(t->count);
861 b8c14089 2003-11-23 devnull memmove(f->writebuf, t->data, t->count);
863 b8c14089 2003-11-23 devnull /* else buffer has already been grown */
864 b8c14089 2003-11-23 devnull f->offset += t->count;
865 b8c14089 2003-11-23 devnull fsysrespond(t, buf, nil);
866 b8c14089 2003-11-23 devnull return t;
868 b8c14089 2003-11-23 devnull /* release partial buffer */
869 b8c14089 2003-11-23 devnull f->offset = 0;
870 b8c14089 2003-11-23 devnull free(f->writebuf);
871 b8c14089 2003-11-23 devnull f->writebuf = nil;
872 b8c14089 2003-11-23 devnull for(i=0; rules[i]; i++)
873 b8c14089 2003-11-23 devnull if((e=matchruleset(m, rules[i])) != nil){
874 b8c14089 2003-11-23 devnull dispose(t, buf, m, rules[i], e);
875 b8c14089 2003-11-23 devnull return nil;
877 b8c14089 2003-11-23 devnull if(m->dst != nil){
878 b8c14089 2003-11-23 devnull dispose(t, buf, m, nil, nil);
879 b8c14089 2003-11-23 devnull return nil;
881 b8c14089 2003-11-23 devnull fsysrespond(t, buf, "no matching plumb rule");
882 b8c14089 2003-11-23 devnull return t;
884 b8c14089 2003-11-23 devnull fsysrespond(t, buf, "internal error: write to unknown file");
885 b8c14089 2003-11-23 devnull return t;
888 b8c14089 2003-11-23 devnull static Fcall*
889 b8c14089 2003-11-23 devnull fsysstat(Fcall *t, uchar *buf, Fid *f)
891 b8c14089 2003-11-23 devnull t->stat = emalloc(messagesize-IOHDRSZ);
892 b8c14089 2003-11-23 devnull t->nstat = dostat(f->dir, t->stat, messagesize-IOHDRSZ, clock);
893 b8c14089 2003-11-23 devnull fsysrespond(t, buf, nil);
894 b8c14089 2003-11-23 devnull free(t->stat);
895 b8c14089 2003-11-23 devnull t->stat = nil;
896 b8c14089 2003-11-23 devnull return t;
899 b8c14089 2003-11-23 devnull static Fcall*
900 32f69c36 2003-12-11 devnull fsyswstat(Fcall *t, uchar *buf, Fid *fid)
902 32f69c36 2003-12-11 devnull USED(fid);
903 b8c14089 2003-11-23 devnull fsysrespond(t, buf, Eperm);
904 b8c14089 2003-11-23 devnull return t;
907 b8c14089 2003-11-23 devnull static Fcall*
908 32f69c36 2003-12-11 devnull fsysremove(Fcall *t, uchar *buf, Fid *fid)
910 32f69c36 2003-12-11 devnull USED(fid);
911 b8c14089 2003-11-23 devnull fsysrespond(t, buf, Eperm);
912 b8c14089 2003-11-23 devnull return t;
915 b8c14089 2003-11-23 devnull static Fcall*
916 b8c14089 2003-11-23 devnull fsysclunk(Fcall *t, uchar *buf, Fid *f)
918 b8c14089 2003-11-23 devnull Fid *prev, *p;
919 b8c14089 2003-11-23 devnull Dirtab *d;
921 b8c14089 2003-11-23 devnull qlock(&queue);
922 b8c14089 2003-11-23 devnull if(f->open){
923 b8c14089 2003-11-23 devnull d = f->dir;
924 b8c14089 2003-11-23 devnull d->nopen--;
925 b8c14089 2003-11-23 devnull if(d->qid==Qrules && (f->mode==OWRITE || f->mode==ORDWR)){
927 b8c14089 2003-11-23 devnull * just to be sure last rule is parsed; error messages will be lost, though,
928 b8c14089 2003-11-23 devnull * unless last write ended with a blank line
930 b8c14089 2003-11-23 devnull writerules(nil, 0);
931 32f69c36 2003-12-11 devnull lock(&rulesref.lk);
932 b8c14089 2003-11-23 devnull rulesref.ref--;
933 32f69c36 2003-12-11 devnull unlock(&rulesref.lk);
935 b8c14089 2003-11-23 devnull prev = nil;
936 b8c14089 2003-11-23 devnull for(p=d->fopen; p; p=p->nextopen){
937 b8c14089 2003-11-23 devnull if(p == f){
938 b8c14089 2003-11-23 devnull if(prev)
939 b8c14089 2003-11-23 devnull prev->nextopen = f->nextopen;
941 b8c14089 2003-11-23 devnull d->fopen = f->nextopen;
942 b8c14089 2003-11-23 devnull removesenders(d, f);
945 b8c14089 2003-11-23 devnull prev = p;
948 b8c14089 2003-11-23 devnull f->busy = 0;
949 b8c14089 2003-11-23 devnull f->open = 0;
950 b8c14089 2003-11-23 devnull f->offset = 0;
951 b8c14089 2003-11-23 devnull if(f->writebuf != nil){
952 b8c14089 2003-11-23 devnull free(f->writebuf);
953 b8c14089 2003-11-23 devnull f->writebuf = nil;
955 b8c14089 2003-11-23 devnull qunlock(&queue);
956 b8c14089 2003-11-23 devnull fsysrespond(t, buf, nil);
957 b8c14089 2003-11-23 devnull return t;
