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 	CFsys *fs;
 60 46f79934 2005-01-04 devnull 	CFid *fid;
 61 46f79934 2005-01-04 devnull 
 62 46f79934 2005-01-04 devnull 	fs = fsinit(fd);
 63 46f79934 2005-01-04 devnull 	if(fs == nil)
 64 46f79934 2005-01-04 devnull 		return nil;
 65 46f79934 2005-01-04 devnull 	strcpy(fs->version, "9P2000");
 66 46f79934 2005-01-04 devnull 	if((n = fsversion(fs, 8192, fs->version, sizeof fs->version)) < 0){
 67 46f79934 2005-01-04 devnull 	Error:
 68 46f79934 2005-01-04 devnull 		fs->fd = -1;
 69 46f79934 2005-01-04 devnull 		fsunmount(fs);
 70 46f79934 2005-01-04 devnull 		return nil;
 71 46f79934 2005-01-04 devnull 	}
 72 46f79934 2005-01-04 devnull 	fs->msize = n;
 73 46f79934 2005-01-04 devnull 
 74 46f79934 2005-01-04 devnull 	if((fid = fsattach(fs, nil, getuser(), aname)) == nil)
 75 46f79934 2005-01-04 devnull 		goto Error;
 76 46f79934 2005-01-04 devnull 	fssetroot(fs, fid);
 77 46f79934 2005-01-04 devnull 	return fs;
 78 46f79934 2005-01-04 devnull }
 79 46f79934 2005-01-04 devnull 
 80 46f79934 2005-01-04 devnull void
 81 46f79934 2005-01-04 devnull fsunmount(CFsys *fs)
 82 46f79934 2005-01-04 devnull {
 83 46f79934 2005-01-04 devnull 	fsclose(fs->root);
 84 46f79934 2005-01-04 devnull 	fs->root = nil;
 85 46f79934 2005-01-04 devnull 	_fsdecref(fs);
 86 46f79934 2005-01-04 devnull }
 87 46f79934 2005-01-04 devnull 
 88 46f79934 2005-01-04 devnull void
 89 46f79934 2005-01-04 devnull _fsdecref(CFsys *fs)
 90 46f79934 2005-01-04 devnull {
 91 46f79934 2005-01-04 devnull 	CFid *f, **l, *next;
 92 46f79934 2005-01-04 devnull 
 93 46f79934 2005-01-04 devnull 	qlock(&fs->lk);
 94 46f79934 2005-01-04 devnull 	--fs->ref;
 95 46f79934 2005-01-04 devnull 	//fprint(2, "fsdecref %p to %d\n", fs, fs->ref);
 96 46f79934 2005-01-04 devnull 	if(fs->ref == 0){
 97 6135dd69 2005-01-19 devnull 		if(fs->fd >= 0)
 98 6135dd69 2005-01-19 devnull 			close(fs->fd);
 99 46f79934 2005-01-04 devnull 		/* trim the list down to just the first in each chunk */
100 46f79934 2005-01-04 devnull 		for(l=&fs->freefid; *l; ){
101 46f79934 2005-01-04 devnull 			if((*l)->fid%CFidchunk == 0)
102 46f79934 2005-01-04 devnull 				l = &(*l)->next;
103 46f79934 2005-01-04 devnull 			else
104 46f79934 2005-01-04 devnull 				*l = (*l)->next;
105 46f79934 2005-01-04 devnull 		}
106 46f79934 2005-01-04 devnull 		/* now free the list */
107 46f79934 2005-01-04 devnull 		for(f=fs->freefid; f; f=next){
108 46f79934 2005-01-04 devnull 			next = f->next;
109 46f79934 2005-01-04 devnull 			free(f);
110 46f79934 2005-01-04 devnull 		}
111 46f79934 2005-01-04 devnull 		closeioproc(fs->iorecv);
112 46f79934 2005-01-04 devnull 		closeioproc(fs->iosend);
113 46f79934 2005-01-04 devnull 		free(fs);
114 46f79934 2005-01-04 devnull 		return;
115 46f79934 2005-01-04 devnull 	}
116 46f79934 2005-01-04 devnull 	qunlock(&fs->lk);
117 46f79934 2005-01-04 devnull }
118 46f79934 2005-01-04 devnull 
119 46f79934 2005-01-04 devnull int
120 46f79934 2005-01-04 devnull fsversion(CFsys *fs, int msize, char *version, int nversion)
121 46f79934 2005-01-04 devnull {
122 46f79934 2005-01-04 devnull 	void *freep;
123 46f79934 2005-01-04 devnull 	int r, oldmintag, oldmaxtag;
124 46f79934 2005-01-04 devnull 	Fcall tx, rx;
125 46f79934 2005-01-04 devnull 
126 46f79934 2005-01-04 devnull 	tx.tag = 0;
127 46f79934 2005-01-04 devnull 	tx.type = Tversion;
128 46f79934 2005-01-04 devnull 	tx.version = version;
129 46f79934 2005-01-04 devnull 	tx.msize = msize;
130 46f79934 2005-01-04 devnull 
131 46f79934 2005-01-04 devnull 	/*
132 46f79934 2005-01-04 devnull 	 * bit of a clumsy hack -- force libmux to use NOTAG as tag.
133 46f79934 2005-01-04 devnull 	 * version can only be sent when there are no other messages
134 46f79934 2005-01-04 devnull 	 * outstanding on the wire, so this is more reasonable than it looks.
135 46f79934 2005-01-04 devnull 	 */
136 46f79934 2005-01-04 devnull 	oldmintag = fs->mux.mintag;
137 46f79934 2005-01-04 devnull 	oldmaxtag = fs->mux.maxtag;
138 46f79934 2005-01-04 devnull 	fs->mux.mintag = NOTAG;
139 46f79934 2005-01-04 devnull 	fs->mux.maxtag = NOTAG+1;
140 46f79934 2005-01-04 devnull 	r = _fsrpc(fs, &tx, &rx, &freep);
141 46f79934 2005-01-04 devnull 	fs->mux.mintag = oldmintag;
142 46f79934 2005-01-04 devnull 	fs->mux.maxtag = oldmaxtag;
143 46f79934 2005-01-04 devnull 	if(r < 0)
144 46f79934 2005-01-04 devnull 		return -1;
145 46f79934 2005-01-04 devnull 
146 46f79934 2005-01-04 devnull 	strecpy(version, version+nversion, rx.version);
147 46f79934 2005-01-04 devnull 	free(freep);
148 46f79934 2005-01-04 devnull 	return rx.msize;
149 46f79934 2005-01-04 devnull }
150 46f79934 2005-01-04 devnull 
151 46f79934 2005-01-04 devnull CFid*
152 46f79934 2005-01-04 devnull fsattach(CFsys *fs, CFid *afid, char *user, char *aname)
153 46f79934 2005-01-04 devnull {
154 46f79934 2005-01-04 devnull 	Fcall tx, rx;
155 46f79934 2005-01-04 devnull 	CFid *fid;
156 46f79934 2005-01-04 devnull 
157 46f79934 2005-01-04 devnull 	if(aname == nil)
158 46f79934 2005-01-04 devnull 		aname = "";
159 46f79934 2005-01-04 devnull 
160 46f79934 2005-01-04 devnull 	if((fid = _fsgetfid(fs)) == nil)
161 46f79934 2005-01-04 devnull 		return nil;
162 46f79934 2005-01-04 devnull 
163 46f79934 2005-01-04 devnull 	tx.tag = 0;
164 46f79934 2005-01-04 devnull 	tx.type = Tattach;
165 46f79934 2005-01-04 devnull 	tx.afid = afid ? afid->fid : NOFID;
166 46f79934 2005-01-04 devnull 	tx.fid = fid->fid;
167 46f79934 2005-01-04 devnull 	tx.uname = user;
168 46f79934 2005-01-04 devnull 	tx.aname = aname;
169 46f79934 2005-01-04 devnull 
170 46f79934 2005-01-04 devnull 	if(_fsrpc(fs, &tx, &rx, 0) < 0){
171 46f79934 2005-01-04 devnull 		_fsputfid(fid);
172 46f79934 2005-01-04 devnull 		return nil;
173 46f79934 2005-01-04 devnull 	}
174 46f79934 2005-01-04 devnull 	fid->qid = rx.qid;
175 46f79934 2005-01-04 devnull 	return fid;
176 46f79934 2005-01-04 devnull }
177 46f79934 2005-01-04 devnull 
178 46f79934 2005-01-04 devnull void
179 46f79934 2005-01-04 devnull fssetroot(CFsys *fs, CFid *fid)
180 46f79934 2005-01-04 devnull {
181 46f79934 2005-01-04 devnull 	if(fs->root)
182 46f79934 2005-01-04 devnull 		_fsputfid(fs->root);
183 46f79934 2005-01-04 devnull 	fs->root = fid;
184 46f79934 2005-01-04 devnull }
185 46f79934 2005-01-04 devnull 
186 46f79934 2005-01-04 devnull int
187 46f79934 2005-01-04 devnull _fsrpc(CFsys *fs, Fcall *tx, Fcall *rx, void **freep)
188 46f79934 2005-01-04 devnull {
189 46f79934 2005-01-04 devnull 	int n, nn;
190 46f79934 2005-01-04 devnull 	void *tpkt, *rpkt;
191 46f79934 2005-01-04 devnull 
192 46f79934 2005-01-04 devnull 	n = sizeS2M(tx);
193 46f79934 2005-01-04 devnull 	tpkt = malloc(n);
194 46f79934 2005-01-04 devnull 	if(freep)
195 46f79934 2005-01-04 devnull 		*freep = nil;
196 46f79934 2005-01-04 devnull 	if(tpkt == nil)
197 46f79934 2005-01-04 devnull 		return -1;
198 46f79934 2005-01-04 devnull 	//fprint(2, "<- %F\n", tx);
199 46f79934 2005-01-04 devnull 	nn = convS2M(tx, tpkt, n);
200 46f79934 2005-01-04 devnull 	if(nn != n){
201 46f79934 2005-01-04 devnull 		free(tpkt);
202 46f79934 2005-01-04 devnull 		werrstr("libfs: sizeS2M convS2M mismatch");
203 46f79934 2005-01-04 devnull 		fprint(2, "%r\n");
204 46f79934 2005-01-04 devnull 		return -1;
205 46f79934 2005-01-04 devnull 	}
206 46f79934 2005-01-04 devnull 	rpkt = muxrpc(&fs->mux, tpkt);
207 46f79934 2005-01-04 devnull 	free(tpkt);
208 46f79934 2005-01-04 devnull 	if(rpkt == nil)
209 46f79934 2005-01-04 devnull 		return -1;
210 46f79934 2005-01-04 devnull 	n = GBIT32((uchar*)rpkt);
211 46f79934 2005-01-04 devnull 	nn = convM2S(rpkt, n, rx);
212 46f79934 2005-01-04 devnull 	if(nn != n){
213 46f79934 2005-01-04 devnull 		free(rpkt);
214 46f79934 2005-01-04 devnull 		werrstr("libfs: convM2S packet size mismatch %d %d", n, nn);
215 46f79934 2005-01-04 devnull 		fprint(2, "%r\n");
216 46f79934 2005-01-04 devnull 		return -1;
217 46f79934 2005-01-04 devnull 	}
218 46f79934 2005-01-04 devnull 	//fprint(2, "-> %F\n", rx);
219 46f79934 2005-01-04 devnull 	if(rx->type == Rerror){
220 46f79934 2005-01-04 devnull 		werrstr("%s", rx->ename);
221 46f79934 2005-01-04 devnull 		free(rpkt);
222 46f79934 2005-01-04 devnull 		return -1;
223 46f79934 2005-01-04 devnull 	}
224 46f79934 2005-01-04 devnull 	if(rx->type != tx->type+1){
225 46f79934 2005-01-04 devnull 		werrstr("packet type mismatch -- tx %d rx %d",
226 46f79934 2005-01-04 devnull 			tx->type, rx->type);
227 46f79934 2005-01-04 devnull 		free(rpkt);
228 46f79934 2005-01-04 devnull 		return -1;
229 46f79934 2005-01-04 devnull 	}
230 46f79934 2005-01-04 devnull 	if(freep)
231 46f79934 2005-01-04 devnull 		*freep = rpkt;
232 46f79934 2005-01-04 devnull 	else
233 46f79934 2005-01-04 devnull 		free(rpkt);
234 46f79934 2005-01-04 devnull 	return 0;
235 46f79934 2005-01-04 devnull }
236 46f79934 2005-01-04 devnull 
237 46f79934 2005-01-04 devnull CFid*
238 46f79934 2005-01-04 devnull _fsgetfid(CFsys *fs)
239 46f79934 2005-01-04 devnull {
240 46f79934 2005-01-04 devnull 	int i;
241 46f79934 2005-01-04 devnull 	CFid *f;
242 46f79934 2005-01-04 devnull 
243 46f79934 2005-01-04 devnull 	qlock(&fs->lk);
244 46f79934 2005-01-04 devnull 	if(fs->freefid == nil){
245 46f79934 2005-01-04 devnull 		f = mallocz(sizeof(CFid)*CFidchunk, 1);
246 46f79934 2005-01-04 devnull 		if(f == nil){
247 46f79934 2005-01-04 devnull 			qunlock(&fs->lk);
248 46f79934 2005-01-04 devnull 			return nil;
249 46f79934 2005-01-04 devnull 		}
250 46f79934 2005-01-04 devnull 		for(i=0; i<CFidchunk; i++){
251 46f79934 2005-01-04 devnull 			f[i].fid = fs->nextfid++;
252 46f79934 2005-01-04 devnull 			f[i].next = &f[i+1];
253 46f79934 2005-01-04 devnull 			f[i].fs = fs;
254 46f79934 2005-01-04 devnull 		}
255 46f79934 2005-01-04 devnull 		f[i-1].next = nil;
256 46f79934 2005-01-04 devnull 		fs->freefid = f;
257 46f79934 2005-01-04 devnull 	}
258 46f79934 2005-01-04 devnull 	f = fs->freefid;
259 46f79934 2005-01-04 devnull 	fs->freefid = f->next;
260 46f79934 2005-01-04 devnull 	fs->ref++;
261 46f79934 2005-01-04 devnull 	qunlock(&fs->lk);
262 46f79934 2005-01-04 devnull 	return f;
263 46f79934 2005-01-04 devnull }
264 46f79934 2005-01-04 devnull 
265 46f79934 2005-01-04 devnull void
266 46f79934 2005-01-04 devnull _fsputfid(CFid *f)
267 46f79934 2005-01-04 devnull {
268 46f79934 2005-01-04 devnull 	CFsys *fs;
269 46f79934 2005-01-04 devnull 
270 46f79934 2005-01-04 devnull 	fs = f->fs;
271 46f79934 2005-01-04 devnull 	qlock(&fs->lk);
272 46f79934 2005-01-04 devnull 	f->next = fs->freefid;
273 46f79934 2005-01-04 devnull 	fs->freefid = f;
274 46f79934 2005-01-04 devnull 	qunlock(&fs->lk);
275 46f79934 2005-01-04 devnull 	_fsdecref(fs);
276 46f79934 2005-01-04 devnull }
277 46f79934 2005-01-04 devnull 
278 46f79934 2005-01-04 devnull static int
279 46f79934 2005-01-04 devnull _fsgettag(Mux *mux, void *pkt)
280 46f79934 2005-01-04 devnull {
281 46f79934 2005-01-04 devnull 	return GBIT16((uchar*)pkt+5);
282 46f79934 2005-01-04 devnull }
283 46f79934 2005-01-04 devnull 
284 46f79934 2005-01-04 devnull static int
285 46f79934 2005-01-04 devnull _fssettag(Mux *mux, void *pkt, uint tag)
286 46f79934 2005-01-04 devnull {
287 46f79934 2005-01-04 devnull 	PBIT16((uchar*)pkt+5, tag);
288 46f79934 2005-01-04 devnull 	return 0;
289 46f79934 2005-01-04 devnull }
290 46f79934 2005-01-04 devnull 
291 46f79934 2005-01-04 devnull static int
292 46f79934 2005-01-04 devnull _fssend(Mux *mux, void *pkt)
293 46f79934 2005-01-04 devnull {
294 46f79934 2005-01-04 devnull 	CFsys *fs;
295 46f79934 2005-01-04 devnull 
296 46f79934 2005-01-04 devnull 	fs = mux->aux;
297 46f79934 2005-01-04 devnull 	return iowrite(fs->iosend, fs->fd, pkt, GBIT32((uchar*)pkt));
298 46f79934 2005-01-04 devnull }
299 46f79934 2005-01-04 devnull 
300 46f79934 2005-01-04 devnull static void*
301 46f79934 2005-01-04 devnull _fsrecv(Mux *mux)
302 46f79934 2005-01-04 devnull {
303 46f79934 2005-01-04 devnull 	uchar *pkt;
304 46f79934 2005-01-04 devnull 	uchar buf[4];
305 46f79934 2005-01-04 devnull 	int n, nfd;
306 46f79934 2005-01-04 devnull 	CFsys *fs;
307 46f79934 2005-01-04 devnull 
308 46f79934 2005-01-04 devnull 	fs = mux->aux;
309 46f79934 2005-01-04 devnull 	n = ioreadn(fs->iorecv, fs->fd, buf, 4);
310 46f79934 2005-01-04 devnull 	if(n != 4)
311 46f79934 2005-01-04 devnull 		return nil;
312 46f79934 2005-01-04 devnull 	n = GBIT32(buf);
313 46f79934 2005-01-04 devnull 	pkt = malloc(n+4);
314 46f79934 2005-01-04 devnull 	if(pkt == nil){
315 46f79934 2005-01-04 devnull 		fprint(2, "libfs out of memory reading 9p packet; here comes trouble\n");
316 46f79934 2005-01-04 devnull 		return nil;
317 46f79934 2005-01-04 devnull 	}
318 46f79934 2005-01-04 devnull 	PBIT32(pkt, n);
319 46f79934 2005-01-04 devnull 	if(ioreadn(fs->iorecv, fs->fd, pkt+4, n-4) != n-4){
320 46f79934 2005-01-04 devnull 		free(pkt);
321 46f79934 2005-01-04 devnull 		return nil;
322 46f79934 2005-01-04 devnull 	}
323 46f79934 2005-01-04 devnull 	if(pkt[4] == Ropenfd){
324 46f79934 2005-01-04 devnull 		if((nfd=iorecvfd(fs->iorecv, fs->fd)) < 0){
325 46f79934 2005-01-04 devnull 			fprint(2, "recv fd error: %r\n");
326 46f79934 2005-01-04 devnull 			free(pkt);
327 46f79934 2005-01-04 devnull 			return nil;
328 46f79934 2005-01-04 devnull 		}
329 46f79934 2005-01-04 devnull 		PBIT32(pkt+n-4, nfd);
330 46f79934 2005-01-04 devnull 	}
331 46f79934 2005-01-04 devnull 	return pkt;
332 46f79934 2005-01-04 devnull }