1 46f79934 2005-01-04 devnull /* Copyright (C) 2003 Russ Cox, Massachusetts Institute of Technology */
  2 46f79934 2005-01-04 devnull /* See COPYRIGHT */
  3 46f79934 2005-01-04 devnull 
  4 46f79934 2005-01-04 devnull #include <u.h>
  5 46f79934 2005-01-04 devnull #include <libc.h>
  6 46f79934 2005-01-04 devnull #include <fcall.h>
  7 46f79934 2005-01-04 devnull #include <9pclient.h>
  8 46f79934 2005-01-04 devnull #include <thread.h>
  9 46f79934 2005-01-04 devnull #include "fsimpl.h"
 10 46f79934 2005-01-04 devnull 
 11 46f79934 2005-01-04 devnull static int _fssend(Mux*, void*);
 12 46f79934 2005-01-04 devnull static void *_fsrecv(Mux*);
 13 46f79934 2005-01-04 devnull static int _fsgettag(Mux*, void*);
 14 46f79934 2005-01-04 devnull static int _fssettag(Mux*, void*, uint);
 15 46f79934 2005-01-04 devnull 
 16 46f79934 2005-01-04 devnull enum
 17 46f79934 2005-01-04 devnull {
 18 46f79934 2005-01-04 devnull 	CFidchunk = 32
 19 46f79934 2005-01-04 devnull };
 20 46f79934 2005-01-04 devnull 
 21 46f79934 2005-01-04 devnull CFsys*
 22 46f79934 2005-01-04 devnull fsinit(int fd)
 23 46f79934 2005-01-04 devnull {
 24 46f79934 2005-01-04 devnull 	CFsys *fs;
 25 46f79934 2005-01-04 devnull 
 26 46f79934 2005-01-04 devnull 	fmtinstall('F', fcallfmt);
 27 46f79934 2005-01-04 devnull 	fmtinstall('D', dirfmt);
 28 46f79934 2005-01-04 devnull 	fmtinstall('M', dirmodefmt);
 29 46f79934 2005-01-04 devnull 
 30 46f79934 2005-01-04 devnull 	fs = mallocz(sizeof(CFsys), 1);
 31 46f79934 2005-01-04 devnull 	if(fs == nil)
 32 46f79934 2005-01-04 devnull 		return nil;
 33 46f79934 2005-01-04 devnull 	fs->fd = fd;
 34 46f79934 2005-01-04 devnull 	fs->ref = 1;
 35 46f79934 2005-01-04 devnull 	fs->mux.aux = fs;
 36 46f79934 2005-01-04 devnull 	fs->mux.mintag = 0;
 37 46f79934 2005-01-04 devnull 	fs->mux.maxtag = 256;
 38 46f79934 2005-01-04 devnull 	fs->mux.send = _fssend;
 39 46f79934 2005-01-04 devnull 	fs->mux.recv = _fsrecv;
 40 46f79934 2005-01-04 devnull 	fs->mux.gettag = _fsgettag;
 41 46f79934 2005-01-04 devnull 	fs->mux.settag = _fssettag;
 42 46f79934 2005-01-04 devnull 	fs->iorecv = ioproc();
 43 46f79934 2005-01-04 devnull 	fs->iosend = ioproc();
 44 46f79934 2005-01-04 devnull 	muxinit(&fs->mux);
 45 46f79934 2005-01-04 devnull 	return fs;
 46 46f79934 2005-01-04 devnull }
 47 46f79934 2005-01-04 devnull 
 48 46f79934 2005-01-04 devnull CFid*
 49 46f79934 2005-01-04 devnull fsroot(CFsys *fs)
 50 46f79934 2005-01-04 devnull {
 51 46f79934 2005-01-04 devnull 	/* N.B. no incref */
 52 46f79934 2005-01-04 devnull 	return fs->root;
 53 46f79934 2005-01-04 devnull }
 54 46f79934 2005-01-04 devnull 
 55 46f79934 2005-01-04 devnull CFsys*
 56 46f79934 2005-01-04 devnull fsmount(int fd, char *aname)
 57 46f79934 2005-01-04 devnull {
 58 46f79934 2005-01-04 devnull 	int n;
 59 46f79934 2005-01-04 devnull 	char *user;
 60 46f79934 2005-01-04 devnull 	CFsys *fs;
 61 46f79934 2005-01-04 devnull 	CFid *fid;
 62 46f79934 2005-01-04 devnull 
 63 46f79934 2005-01-04 devnull 	fs = fsinit(fd);
 64 46f79934 2005-01-04 devnull 	if(fs == nil)
 65 46f79934 2005-01-04 devnull 		return nil;
 66 46f79934 2005-01-04 devnull 	strcpy(fs->version, "9P2000");
 67 46f79934 2005-01-04 devnull 	if((n = fsversion(fs, 8192, fs->version, sizeof fs->version)) < 0){
 68 46f79934 2005-01-04 devnull 	Error:
 69 46f79934 2005-01-04 devnull 		fs->fd = -1;
 70 46f79934 2005-01-04 devnull 		fsunmount(fs);
 71 46f79934 2005-01-04 devnull 		return nil;
 72 46f79934 2005-01-04 devnull 	}
 73 46f79934 2005-01-04 devnull 	fs->msize = n;
 74 46f79934 2005-01-04 devnull 
 75 46f79934 2005-01-04 devnull 	user = getuser();
 76 46f79934 2005-01-04 devnull 	if((fid = fsattach(fs, nil, getuser(), aname)) == nil)
 77 46f79934 2005-01-04 devnull 		goto Error;
 78 46f79934 2005-01-04 devnull 	fssetroot(fs, fid);
 79 46f79934 2005-01-04 devnull 	return fs;
 80 46f79934 2005-01-04 devnull }
 81 46f79934 2005-01-04 devnull 
 82 46f79934 2005-01-04 devnull void
 83 46f79934 2005-01-04 devnull fsunmount(CFsys *fs)
 84 46f79934 2005-01-04 devnull {
 85 46f79934 2005-01-04 devnull 	fsclose(fs->root);
 86 46f79934 2005-01-04 devnull 	fs->root = nil;
 87 46f79934 2005-01-04 devnull 	_fsdecref(fs);
 88 46f79934 2005-01-04 devnull }
 89 46f79934 2005-01-04 devnull 
 90 46f79934 2005-01-04 devnull void
 91 46f79934 2005-01-04 devnull _fsdecref(CFsys *fs)
 92 46f79934 2005-01-04 devnull {
 93 46f79934 2005-01-04 devnull 	CFid *f, **l, *next;
 94 46f79934 2005-01-04 devnull 
 95 46f79934 2005-01-04 devnull 	qlock(&fs->lk);
 96 46f79934 2005-01-04 devnull 	--fs->ref;
 97 46f79934 2005-01-04 devnull 	//fprint(2, "fsdecref %p to %d\n", fs, fs->ref);
 98 46f79934 2005-01-04 devnull 	if(fs->ref == 0){
 99 46f79934 2005-01-04 devnull 		close(fs->fd);
100 46f79934 2005-01-04 devnull 		/* trim the list down to just the first in each chunk */
101 46f79934 2005-01-04 devnull 		for(l=&fs->freefid; *l; ){
102 46f79934 2005-01-04 devnull 			if((*l)->fid%CFidchunk == 0)
103 46f79934 2005-01-04 devnull 				l = &(*l)->next;
104 46f79934 2005-01-04 devnull 			else
105 46f79934 2005-01-04 devnull 				*l = (*l)->next;
106 46f79934 2005-01-04 devnull 		}
107 46f79934 2005-01-04 devnull 		/* now free the list */
108 46f79934 2005-01-04 devnull 		for(f=fs->freefid; f; f=next){
109 46f79934 2005-01-04 devnull 			next = f->next;
110 46f79934 2005-01-04 devnull 			free(f);
111 46f79934 2005-01-04 devnull 		}
112 46f79934 2005-01-04 devnull 		closeioproc(fs->iorecv);
113 46f79934 2005-01-04 devnull 		closeioproc(fs->iosend);
114 46f79934 2005-01-04 devnull 		free(fs);
115 46f79934 2005-01-04 devnull 		return;
116 46f79934 2005-01-04 devnull 	}
117 46f79934 2005-01-04 devnull 	qunlock(&fs->lk);
118 46f79934 2005-01-04 devnull }
119 46f79934 2005-01-04 devnull 
120 46f79934 2005-01-04 devnull int
121 46f79934 2005-01-04 devnull fsversion(CFsys *fs, int msize, char *version, int nversion)
122 46f79934 2005-01-04 devnull {
123 46f79934 2005-01-04 devnull 	void *freep;
124 46f79934 2005-01-04 devnull 	int r, oldmintag, oldmaxtag;
125 46f79934 2005-01-04 devnull 	Fcall tx, rx;
126 46f79934 2005-01-04 devnull 
127 46f79934 2005-01-04 devnull 	tx.tag = 0;
128 46f79934 2005-01-04 devnull 	tx.type = Tversion;
129 46f79934 2005-01-04 devnull 	tx.version = version;
130 46f79934 2005-01-04 devnull 	tx.msize = msize;
131 46f79934 2005-01-04 devnull 
132 46f79934 2005-01-04 devnull 	/*
133 46f79934 2005-01-04 devnull 	 * bit of a clumsy hack -- force libmux to use NOTAG as tag.
134 46f79934 2005-01-04 devnull 	 * version can only be sent when there are no other messages
135 46f79934 2005-01-04 devnull 	 * outstanding on the wire, so this is more reasonable than it looks.
136 46f79934 2005-01-04 devnull 	 */
137 46f79934 2005-01-04 devnull 	oldmintag = fs->mux.mintag;
138 46f79934 2005-01-04 devnull 	oldmaxtag = fs->mux.maxtag;
139 46f79934 2005-01-04 devnull 	fs->mux.mintag = NOTAG;
140 46f79934 2005-01-04 devnull 	fs->mux.maxtag = NOTAG+1;
141 46f79934 2005-01-04 devnull 	r = _fsrpc(fs, &tx, &rx, &freep);
142 46f79934 2005-01-04 devnull 	fs->mux.mintag = oldmintag;
143 46f79934 2005-01-04 devnull 	fs->mux.maxtag = oldmaxtag;
144 46f79934 2005-01-04 devnull 	if(r < 0)
145 46f79934 2005-01-04 devnull 		return -1;
146 46f79934 2005-01-04 devnull 
147 46f79934 2005-01-04 devnull 	strecpy(version, version+nversion, rx.version);
148 46f79934 2005-01-04 devnull 	free(freep);
149 46f79934 2005-01-04 devnull 	return rx.msize;
150 46f79934 2005-01-04 devnull }
151 46f79934 2005-01-04 devnull 
152 46f79934 2005-01-04 devnull CFid*
153 46f79934 2005-01-04 devnull fsattach(CFsys *fs, CFid *afid, char *user, char *aname)
154 46f79934 2005-01-04 devnull {
155 46f79934 2005-01-04 devnull 	Fcall tx, rx;
156 46f79934 2005-01-04 devnull 	CFid *fid;
157 46f79934 2005-01-04 devnull 
158 46f79934 2005-01-04 devnull 	if(aname == nil)
159 46f79934 2005-01-04 devnull 		aname = "";
160 46f79934 2005-01-04 devnull 
161 46f79934 2005-01-04 devnull 	if((fid = _fsgetfid(fs)) == nil)
162 46f79934 2005-01-04 devnull 		return nil;
163 46f79934 2005-01-04 devnull 
164 46f79934 2005-01-04 devnull 	tx.tag = 0;
165 46f79934 2005-01-04 devnull 	tx.type = Tattach;
166 46f79934 2005-01-04 devnull 	tx.afid = afid ? afid->fid : NOFID;
167 46f79934 2005-01-04 devnull 	tx.fid = fid->fid;
168 46f79934 2005-01-04 devnull 	tx.uname = user;
169 46f79934 2005-01-04 devnull 	tx.aname = aname;
170 46f79934 2005-01-04 devnull 
171 46f79934 2005-01-04 devnull 	if(_fsrpc(fs, &tx, &rx, 0) < 0){
172 46f79934 2005-01-04 devnull 		_fsputfid(fid);
173 46f79934 2005-01-04 devnull 		return nil;
174 46f79934 2005-01-04 devnull 	}
175 46f79934 2005-01-04 devnull 	fid->qid = rx.qid;
176 46f79934 2005-01-04 devnull 	return fid;
177 46f79934 2005-01-04 devnull }
178 46f79934 2005-01-04 devnull 
179 46f79934 2005-01-04 devnull void
180 46f79934 2005-01-04 devnull fssetroot(CFsys *fs, CFid *fid)
181 46f79934 2005-01-04 devnull {
182 46f79934 2005-01-04 devnull 	if(fs->root)
183 46f79934 2005-01-04 devnull 		_fsputfid(fs->root);
184 46f79934 2005-01-04 devnull 	fs->root = fid;
185 46f79934 2005-01-04 devnull }
186 46f79934 2005-01-04 devnull 
187 46f79934 2005-01-04 devnull int
188 46f79934 2005-01-04 devnull _fsrpc(CFsys *fs, Fcall *tx, Fcall *rx, void **freep)
189 46f79934 2005-01-04 devnull {
190 46f79934 2005-01-04 devnull 	int n, nn;
191 46f79934 2005-01-04 devnull 	void *tpkt, *rpkt;
192 46f79934 2005-01-04 devnull 
193 46f79934 2005-01-04 devnull 	n = sizeS2M(tx);
194 46f79934 2005-01-04 devnull 	tpkt = malloc(n);
195 46f79934 2005-01-04 devnull 	if(freep)
196 46f79934 2005-01-04 devnull 		*freep = nil;
197 46f79934 2005-01-04 devnull 	if(tpkt == nil)
198 46f79934 2005-01-04 devnull 		return -1;
199 46f79934 2005-01-04 devnull 	//fprint(2, "<- %F\n", tx);
200 46f79934 2005-01-04 devnull 	nn = convS2M(tx, tpkt, n);
201 46f79934 2005-01-04 devnull 	if(nn != n){
202 46f79934 2005-01-04 devnull 		free(tpkt);
203 46f79934 2005-01-04 devnull 		werrstr("libfs: sizeS2M convS2M mismatch");
204 46f79934 2005-01-04 devnull 		fprint(2, "%r\n");
205 46f79934 2005-01-04 devnull 		return -1;
206 46f79934 2005-01-04 devnull 	}
207 46f79934 2005-01-04 devnull 	rpkt = muxrpc(&fs->mux, tpkt);
208 46f79934 2005-01-04 devnull 	free(tpkt);
209 46f79934 2005-01-04 devnull 	if(rpkt == nil)
210 46f79934 2005-01-04 devnull 		return -1;
211 46f79934 2005-01-04 devnull 	n = GBIT32((uchar*)rpkt);
212 46f79934 2005-01-04 devnull 	nn = convM2S(rpkt, n, rx);
213 46f79934 2005-01-04 devnull 	if(nn != n){
214 46f79934 2005-01-04 devnull 		free(rpkt);
215 46f79934 2005-01-04 devnull 		werrstr("libfs: convM2S packet size mismatch %d %d", n, nn);
216 46f79934 2005-01-04 devnull 		fprint(2, "%r\n");
217 46f79934 2005-01-04 devnull 		return -1;
218 46f79934 2005-01-04 devnull 	}
219 46f79934 2005-01-04 devnull 	//fprint(2, "-> %F\n", rx);
220 46f79934 2005-01-04 devnull 	if(rx->type == Rerror){
221 46f79934 2005-01-04 devnull 		werrstr("%s", rx->ename);
222 46f79934 2005-01-04 devnull 		free(rpkt);
223 46f79934 2005-01-04 devnull 		return -1;
224 46f79934 2005-01-04 devnull 	}
225 46f79934 2005-01-04 devnull 	if(rx->type != tx->type+1){
226 46f79934 2005-01-04 devnull 		werrstr("packet type mismatch -- tx %d rx %d",
227 46f79934 2005-01-04 devnull 			tx->type, rx->type);
228 46f79934 2005-01-04 devnull 		free(rpkt);
229 46f79934 2005-01-04 devnull 		return -1;
230 46f79934 2005-01-04 devnull 	}
231 46f79934 2005-01-04 devnull 	if(freep)
232 46f79934 2005-01-04 devnull 		*freep = rpkt;
233 46f79934 2005-01-04 devnull 	else
234 46f79934 2005-01-04 devnull 		free(rpkt);
235 46f79934 2005-01-04 devnull 	return 0;
236 46f79934 2005-01-04 devnull }
237 46f79934 2005-01-04 devnull 
238 46f79934 2005-01-04 devnull CFid*
239 46f79934 2005-01-04 devnull _fsgetfid(CFsys *fs)
240 46f79934 2005-01-04 devnull {
241 46f79934 2005-01-04 devnull 	int i;
242 46f79934 2005-01-04 devnull 	CFid *f;
243 46f79934 2005-01-04 devnull 
244 46f79934 2005-01-04 devnull 	qlock(&fs->lk);
245 46f79934 2005-01-04 devnull 	if(fs->freefid == nil){
246 46f79934 2005-01-04 devnull 		f = mallocz(sizeof(CFid)*CFidchunk, 1);
247 46f79934 2005-01-04 devnull 		if(f == nil){
248 46f79934 2005-01-04 devnull 			qunlock(&fs->lk);
249 46f79934 2005-01-04 devnull 			return nil;
250 46f79934 2005-01-04 devnull 		}
251 46f79934 2005-01-04 devnull 		for(i=0; i<CFidchunk; i++){
252 46f79934 2005-01-04 devnull 			f[i].fid = fs->nextfid++;
253 46f79934 2005-01-04 devnull 			f[i].next = &f[i+1];
254 46f79934 2005-01-04 devnull 			f[i].fs = fs;
255 46f79934 2005-01-04 devnull 		}
256 46f79934 2005-01-04 devnull 		f[i-1].next = nil;
257 46f79934 2005-01-04 devnull 		fs->freefid = f;
258 46f79934 2005-01-04 devnull 	}
259 46f79934 2005-01-04 devnull 	f = fs->freefid;
260 46f79934 2005-01-04 devnull 	fs->freefid = f->next;
261 46f79934 2005-01-04 devnull 	fs->ref++;
262 46f79934 2005-01-04 devnull 	qunlock(&fs->lk);
263 46f79934 2005-01-04 devnull 	return f;
264 46f79934 2005-01-04 devnull }
265 46f79934 2005-01-04 devnull 
266 46f79934 2005-01-04 devnull void
267 46f79934 2005-01-04 devnull _fsputfid(CFid *f)
268 46f79934 2005-01-04 devnull {
269 46f79934 2005-01-04 devnull 	CFsys *fs;
270 46f79934 2005-01-04 devnull 
271 46f79934 2005-01-04 devnull 	fs = f->fs;
272 46f79934 2005-01-04 devnull 	qlock(&fs->lk);
273 46f79934 2005-01-04 devnull 	f->next = fs->freefid;
274 46f79934 2005-01-04 devnull 	fs->freefid = f;
275 46f79934 2005-01-04 devnull 	qunlock(&fs->lk);
276 46f79934 2005-01-04 devnull 	_fsdecref(fs);
277 46f79934 2005-01-04 devnull }
278 46f79934 2005-01-04 devnull 
279 46f79934 2005-01-04 devnull static int
280 46f79934 2005-01-04 devnull _fsgettag(Mux *mux, void *pkt)
281 46f79934 2005-01-04 devnull {
282 46f79934 2005-01-04 devnull 	return GBIT16((uchar*)pkt+5);
283 46f79934 2005-01-04 devnull }
284 46f79934 2005-01-04 devnull 
285 46f79934 2005-01-04 devnull static int
286 46f79934 2005-01-04 devnull _fssettag(Mux *mux, void *pkt, uint tag)
287 46f79934 2005-01-04 devnull {
288 46f79934 2005-01-04 devnull 	PBIT16((uchar*)pkt+5, tag);
289 46f79934 2005-01-04 devnull 	return 0;
290 46f79934 2005-01-04 devnull }
291 46f79934 2005-01-04 devnull 
292 46f79934 2005-01-04 devnull static int
293 46f79934 2005-01-04 devnull _fssend(Mux *mux, void *pkt)
294 46f79934 2005-01-04 devnull {
295 46f79934 2005-01-04 devnull 	CFsys *fs;
296 46f79934 2005-01-04 devnull 
297 46f79934 2005-01-04 devnull 	fs = mux->aux;
298 46f79934 2005-01-04 devnull 	return iowrite(fs->iosend, fs->fd, pkt, GBIT32((uchar*)pkt));
299 46f79934 2005-01-04 devnull }
300 46f79934 2005-01-04 devnull 
301 46f79934 2005-01-04 devnull static void*
302 46f79934 2005-01-04 devnull _fsrecv(Mux *mux)
303 46f79934 2005-01-04 devnull {
304 46f79934 2005-01-04 devnull 	uchar *pkt;
305 46f79934 2005-01-04 devnull 	uchar buf[4];
306 46f79934 2005-01-04 devnull 	int n, nfd;
307 46f79934 2005-01-04 devnull 	CFsys *fs;
308 46f79934 2005-01-04 devnull 
309 46f79934 2005-01-04 devnull 	fs = mux->aux;
310 46f79934 2005-01-04 devnull 	n = ioreadn(fs->iorecv, fs->fd, buf, 4);
311 46f79934 2005-01-04 devnull 	if(n != 4)
312 46f79934 2005-01-04 devnull 		return nil;
313 46f79934 2005-01-04 devnull 	n = GBIT32(buf);
314 46f79934 2005-01-04 devnull 	pkt = malloc(n+4);
315 46f79934 2005-01-04 devnull 	if(pkt == nil){
316 46f79934 2005-01-04 devnull 		fprint(2, "libfs out of memory reading 9p packet; here comes trouble\n");
317 46f79934 2005-01-04 devnull 		return nil;
318 46f79934 2005-01-04 devnull 	}
319 46f79934 2005-01-04 devnull 	PBIT32(pkt, n);
320 46f79934 2005-01-04 devnull 	if(ioreadn(fs->iorecv, fs->fd, pkt+4, n-4) != n-4){
321 46f79934 2005-01-04 devnull 		free(pkt);
322 46f79934 2005-01-04 devnull 		return nil;
323 46f79934 2005-01-04 devnull 	}
324 46f79934 2005-01-04 devnull 	if(pkt[4] == Ropenfd){
325 46f79934 2005-01-04 devnull 		if((nfd=iorecvfd(fs->iorecv, fs->fd)) < 0){
326 46f79934 2005-01-04 devnull 			fprint(2, "recv fd error: %r\n");
327 46f79934 2005-01-04 devnull 			free(pkt);
328 46f79934 2005-01-04 devnull 			return nil;
329 46f79934 2005-01-04 devnull 		}
330 46f79934 2005-01-04 devnull 		PBIT32(pkt+n-4, nfd);
331 46f79934 2005-01-04 devnull 	}
332 46f79934 2005-01-04 devnull 	return pkt;
333 46f79934 2005-01-04 devnull }