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 59518849 2005-02-11 devnull int chatty9pclient;
 17 59518849 2005-02-11 devnull 
 18 46f79934 2005-01-04 devnull enum
 19 46f79934 2005-01-04 devnull {
 20 46f79934 2005-01-04 devnull 	CFidchunk = 32
 21 46f79934 2005-01-04 devnull };
 22 46f79934 2005-01-04 devnull 
 23 46f79934 2005-01-04 devnull CFsys*
 24 46f79934 2005-01-04 devnull fsinit(int fd)
 25 46f79934 2005-01-04 devnull {
 26 46f79934 2005-01-04 devnull 	CFsys *fs;
 27 59518849 2005-02-11 devnull 	int n;
 28 59518849 2005-02-11 devnull 	
 29 46f79934 2005-01-04 devnull 	fmtinstall('F', fcallfmt);
 30 46f79934 2005-01-04 devnull 	fmtinstall('D', dirfmt);
 31 46f79934 2005-01-04 devnull 	fmtinstall('M', dirmodefmt);
 32 46f79934 2005-01-04 devnull 
 33 46f79934 2005-01-04 devnull 	fs = mallocz(sizeof(CFsys), 1);
 34 46f79934 2005-01-04 devnull 	if(fs == nil)
 35 46f79934 2005-01-04 devnull 		return nil;
 36 46f79934 2005-01-04 devnull 	fs->fd = fd;
 37 46f79934 2005-01-04 devnull 	fs->ref = 1;
 38 46f79934 2005-01-04 devnull 	fs->mux.aux = fs;
 39 46f79934 2005-01-04 devnull 	fs->mux.mintag = 0;
 40 46f79934 2005-01-04 devnull 	fs->mux.maxtag = 256;
 41 46f79934 2005-01-04 devnull 	fs->mux.send = _fssend;
 42 46f79934 2005-01-04 devnull 	fs->mux.recv = _fsrecv;
 43 46f79934 2005-01-04 devnull 	fs->mux.gettag = _fsgettag;
 44 46f79934 2005-01-04 devnull 	fs->mux.settag = _fssettag;
 45 46f79934 2005-01-04 devnull 	fs->iorecv = ioproc();
 46 46f79934 2005-01-04 devnull 	fs->iosend = ioproc();
 47 46f79934 2005-01-04 devnull 	muxinit(&fs->mux);
 48 59518849 2005-02-11 devnull 	
 49 59518849 2005-02-11 devnull 	strcpy(fs->version, "9P2000");
 50 59518849 2005-02-11 devnull 	if((n = fsversion(fs, 8192, fs->version, sizeof fs->version)) < 0){
 51 59518849 2005-02-11 devnull 		_fsunmount(fs);
 52 59518849 2005-02-11 devnull 		return nil;
 53 59518849 2005-02-11 devnull 	}
 54 59518849 2005-02-11 devnull 	fs->msize = n;
 55 46f79934 2005-01-04 devnull 	return fs;
 56 46f79934 2005-01-04 devnull }
 57 46f79934 2005-01-04 devnull 
 58 46f79934 2005-01-04 devnull CFid*
 59 46f79934 2005-01-04 devnull fsroot(CFsys *fs)
 60 46f79934 2005-01-04 devnull {
 61 46f79934 2005-01-04 devnull 	/* N.B. no incref */
 62 46f79934 2005-01-04 devnull 	return fs->root;
 63 46f79934 2005-01-04 devnull }
 64 46f79934 2005-01-04 devnull 
 65 46f79934 2005-01-04 devnull CFsys*
 66 46f79934 2005-01-04 devnull fsmount(int fd, char *aname)
 67 46f79934 2005-01-04 devnull {
 68 46f79934 2005-01-04 devnull 	CFsys *fs;
 69 46f79934 2005-01-04 devnull 	CFid *fid;
 70 46f79934 2005-01-04 devnull 
 71 46f79934 2005-01-04 devnull 	fs = fsinit(fd);
 72 46f79934 2005-01-04 devnull 	if(fs == nil)
 73 46f79934 2005-01-04 devnull 		return nil;
 74 46f79934 2005-01-04 devnull 
 75 59518849 2005-02-11 devnull 	if((fid = fsattach(fs, nil, getuser(), aname)) == nil){
 76 59518849 2005-02-11 devnull 		_fsunmount(fs);
 77 59518849 2005-02-11 devnull 		return nil;
 78 59518849 2005-02-11 devnull 	}
 79 46f79934 2005-01-04 devnull 	fssetroot(fs, fid);
 80 46f79934 2005-01-04 devnull 	return fs;
 81 59518849 2005-02-11 devnull }
 82 59518849 2005-02-11 devnull 
 83 59518849 2005-02-11 devnull void
 84 59518849 2005-02-11 devnull _fsunmount(CFsys *fs)
 85 59518849 2005-02-11 devnull {
 86 59518849 2005-02-11 devnull 	fs->fd = -1;
 87 59518849 2005-02-11 devnull 	fsunmount(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 fsunmount(CFsys *fs)
 92 46f79934 2005-01-04 devnull {
 93 46f79934 2005-01-04 devnull 	fsclose(fs->root);
 94 46f79934 2005-01-04 devnull 	fs->root = nil;
 95 46f79934 2005-01-04 devnull 	_fsdecref(fs);
 96 46f79934 2005-01-04 devnull }
 97 46f79934 2005-01-04 devnull 
 98 46f79934 2005-01-04 devnull void
 99 46f79934 2005-01-04 devnull _fsdecref(CFsys *fs)
100 46f79934 2005-01-04 devnull {
101 46f79934 2005-01-04 devnull 	CFid *f, **l, *next;
102 46f79934 2005-01-04 devnull 
103 46f79934 2005-01-04 devnull 	qlock(&fs->lk);
104 46f79934 2005-01-04 devnull 	--fs->ref;
105 46f79934 2005-01-04 devnull 	//fprint(2, "fsdecref %p to %d\n", fs, fs->ref);
106 46f79934 2005-01-04 devnull 	if(fs->ref == 0){
107 6135dd69 2005-01-19 devnull 		if(fs->fd >= 0)
108 6135dd69 2005-01-19 devnull 			close(fs->fd);
109 46f79934 2005-01-04 devnull 		/* trim the list down to just the first in each chunk */
110 46f79934 2005-01-04 devnull 		for(l=&fs->freefid; *l; ){
111 46f79934 2005-01-04 devnull 			if((*l)->fid%CFidchunk == 0)
112 46f79934 2005-01-04 devnull 				l = &(*l)->next;
113 46f79934 2005-01-04 devnull 			else
114 46f79934 2005-01-04 devnull 				*l = (*l)->next;
115 46f79934 2005-01-04 devnull 		}
116 46f79934 2005-01-04 devnull 		/* now free the list */
117 46f79934 2005-01-04 devnull 		for(f=fs->freefid; f; f=next){
118 46f79934 2005-01-04 devnull 			next = f->next;
119 46f79934 2005-01-04 devnull 			free(f);
120 46f79934 2005-01-04 devnull 		}
121 46f79934 2005-01-04 devnull 		closeioproc(fs->iorecv);
122 46f79934 2005-01-04 devnull 		closeioproc(fs->iosend);
123 46f79934 2005-01-04 devnull 		free(fs);
124 46f79934 2005-01-04 devnull 		return;
125 46f79934 2005-01-04 devnull 	}
126 46f79934 2005-01-04 devnull 	qunlock(&fs->lk);
127 46f79934 2005-01-04 devnull }
128 46f79934 2005-01-04 devnull 
129 46f79934 2005-01-04 devnull int
130 46f79934 2005-01-04 devnull fsversion(CFsys *fs, int msize, char *version, int nversion)
131 46f79934 2005-01-04 devnull {
132 46f79934 2005-01-04 devnull 	void *freep;
133 46f79934 2005-01-04 devnull 	int r, oldmintag, oldmaxtag;
134 46f79934 2005-01-04 devnull 	Fcall tx, rx;
135 46f79934 2005-01-04 devnull 
136 46f79934 2005-01-04 devnull 	tx.tag = 0;
137 46f79934 2005-01-04 devnull 	tx.type = Tversion;
138 46f79934 2005-01-04 devnull 	tx.version = version;
139 46f79934 2005-01-04 devnull 	tx.msize = msize;
140 46f79934 2005-01-04 devnull 
141 46f79934 2005-01-04 devnull 	/*
142 46f79934 2005-01-04 devnull 	 * bit of a clumsy hack -- force libmux to use NOTAG as tag.
143 46f79934 2005-01-04 devnull 	 * version can only be sent when there are no other messages
144 46f79934 2005-01-04 devnull 	 * outstanding on the wire, so this is more reasonable than it looks.
145 46f79934 2005-01-04 devnull 	 */
146 46f79934 2005-01-04 devnull 	oldmintag = fs->mux.mintag;
147 46f79934 2005-01-04 devnull 	oldmaxtag = fs->mux.maxtag;
148 46f79934 2005-01-04 devnull 	fs->mux.mintag = NOTAG;
149 46f79934 2005-01-04 devnull 	fs->mux.maxtag = NOTAG+1;
150 46f79934 2005-01-04 devnull 	r = _fsrpc(fs, &tx, &rx, &freep);
151 46f79934 2005-01-04 devnull 	fs->mux.mintag = oldmintag;
152 46f79934 2005-01-04 devnull 	fs->mux.maxtag = oldmaxtag;
153 46f79934 2005-01-04 devnull 	if(r < 0)
154 46f79934 2005-01-04 devnull 		return -1;
155 46f79934 2005-01-04 devnull 
156 46f79934 2005-01-04 devnull 	strecpy(version, version+nversion, rx.version);
157 46f79934 2005-01-04 devnull 	free(freep);
158 80ecfd24 2005-02-08 devnull 	fs->msize = rx.msize;
159 46f79934 2005-01-04 devnull 	return rx.msize;
160 46f79934 2005-01-04 devnull }
161 46f79934 2005-01-04 devnull 
162 46f79934 2005-01-04 devnull CFid*
163 46f79934 2005-01-04 devnull fsattach(CFsys *fs, CFid *afid, char *user, char *aname)
164 46f79934 2005-01-04 devnull {
165 46f79934 2005-01-04 devnull 	Fcall tx, rx;
166 46f79934 2005-01-04 devnull 	CFid *fid;
167 46f79934 2005-01-04 devnull 
168 46f79934 2005-01-04 devnull 	if(aname == nil)
169 46f79934 2005-01-04 devnull 		aname = "";
170 46f79934 2005-01-04 devnull 
171 46f79934 2005-01-04 devnull 	if((fid = _fsgetfid(fs)) == nil)
172 46f79934 2005-01-04 devnull 		return nil;
173 46f79934 2005-01-04 devnull 
174 46f79934 2005-01-04 devnull 	tx.tag = 0;
175 46f79934 2005-01-04 devnull 	tx.type = Tattach;
176 46f79934 2005-01-04 devnull 	tx.afid = afid ? afid->fid : NOFID;
177 46f79934 2005-01-04 devnull 	tx.fid = fid->fid;
178 46f79934 2005-01-04 devnull 	tx.uname = user;
179 46f79934 2005-01-04 devnull 	tx.aname = aname;
180 46f79934 2005-01-04 devnull 
181 46f79934 2005-01-04 devnull 	if(_fsrpc(fs, &tx, &rx, 0) < 0){
182 46f79934 2005-01-04 devnull 		_fsputfid(fid);
183 46f79934 2005-01-04 devnull 		return nil;
184 46f79934 2005-01-04 devnull 	}
185 46f79934 2005-01-04 devnull 	fid->qid = rx.qid;
186 46f79934 2005-01-04 devnull 	return fid;
187 46f79934 2005-01-04 devnull }
188 46f79934 2005-01-04 devnull 
189 46f79934 2005-01-04 devnull void
190 46f79934 2005-01-04 devnull fssetroot(CFsys *fs, CFid *fid)
191 46f79934 2005-01-04 devnull {
192 46f79934 2005-01-04 devnull 	if(fs->root)
193 46f79934 2005-01-04 devnull 		_fsputfid(fs->root);
194 46f79934 2005-01-04 devnull 	fs->root = fid;
195 46f79934 2005-01-04 devnull }
196 46f79934 2005-01-04 devnull 
197 46f79934 2005-01-04 devnull int
198 46f79934 2005-01-04 devnull _fsrpc(CFsys *fs, Fcall *tx, Fcall *rx, void **freep)
199 46f79934 2005-01-04 devnull {
200 46f79934 2005-01-04 devnull 	int n, nn;
201 46f79934 2005-01-04 devnull 	void *tpkt, *rpkt;
202 46f79934 2005-01-04 devnull 
203 46f79934 2005-01-04 devnull 	n = sizeS2M(tx);
204 46f79934 2005-01-04 devnull 	tpkt = malloc(n);
205 46f79934 2005-01-04 devnull 	if(freep)
206 46f79934 2005-01-04 devnull 		*freep = nil;
207 46f79934 2005-01-04 devnull 	if(tpkt == nil)
208 46f79934 2005-01-04 devnull 		return -1;
209 59518849 2005-02-11 devnull 	tx->tag = 0;
210 59518849 2005-02-11 devnull 	if(chatty9pclient)
211 59518849 2005-02-11 devnull 		fprint(2, "<- %F\n", tx);
212 46f79934 2005-01-04 devnull 	nn = convS2M(tx, tpkt, n);
213 46f79934 2005-01-04 devnull 	if(nn != n){
214 46f79934 2005-01-04 devnull 		free(tpkt);
215 46f79934 2005-01-04 devnull 		werrstr("libfs: sizeS2M convS2M mismatch");
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 	rpkt = muxrpc(&fs->mux, tpkt);
220 46f79934 2005-01-04 devnull 	free(tpkt);
221 46f79934 2005-01-04 devnull 	if(rpkt == nil)
222 46f79934 2005-01-04 devnull 		return -1;
223 46f79934 2005-01-04 devnull 	n = GBIT32((uchar*)rpkt);
224 46f79934 2005-01-04 devnull 	nn = convM2S(rpkt, n, rx);
225 46f79934 2005-01-04 devnull 	if(nn != n){
226 46f79934 2005-01-04 devnull 		free(rpkt);
227 46f79934 2005-01-04 devnull 		werrstr("libfs: convM2S packet size mismatch %d %d", n, nn);
228 46f79934 2005-01-04 devnull 		fprint(2, "%r\n");
229 46f79934 2005-01-04 devnull 		return -1;
230 46f79934 2005-01-04 devnull 	}
231 59518849 2005-02-11 devnull 	if(chatty9pclient)
232 59518849 2005-02-11 devnull 		fprint(2, "-> %F\n", rx);
233 46f79934 2005-01-04 devnull 	if(rx->type == Rerror){
234 46f79934 2005-01-04 devnull 		werrstr("%s", rx->ename);
235 46f79934 2005-01-04 devnull 		free(rpkt);
236 46f79934 2005-01-04 devnull 		return -1;
237 46f79934 2005-01-04 devnull 	}
238 46f79934 2005-01-04 devnull 	if(rx->type != tx->type+1){
239 46f79934 2005-01-04 devnull 		werrstr("packet type mismatch -- tx %d rx %d",
240 46f79934 2005-01-04 devnull 			tx->type, rx->type);
241 46f79934 2005-01-04 devnull 		free(rpkt);
242 46f79934 2005-01-04 devnull 		return -1;
243 46f79934 2005-01-04 devnull 	}
244 46f79934 2005-01-04 devnull 	if(freep)
245 46f79934 2005-01-04 devnull 		*freep = rpkt;
246 46f79934 2005-01-04 devnull 	else
247 46f79934 2005-01-04 devnull 		free(rpkt);
248 46f79934 2005-01-04 devnull 	return 0;
249 46f79934 2005-01-04 devnull }
250 46f79934 2005-01-04 devnull 
251 46f79934 2005-01-04 devnull CFid*
252 46f79934 2005-01-04 devnull _fsgetfid(CFsys *fs)
253 46f79934 2005-01-04 devnull {
254 46f79934 2005-01-04 devnull 	int i;
255 46f79934 2005-01-04 devnull 	CFid *f;
256 46f79934 2005-01-04 devnull 
257 46f79934 2005-01-04 devnull 	qlock(&fs->lk);
258 46f79934 2005-01-04 devnull 	if(fs->freefid == nil){
259 46f79934 2005-01-04 devnull 		f = mallocz(sizeof(CFid)*CFidchunk, 1);
260 46f79934 2005-01-04 devnull 		if(f == nil){
261 46f79934 2005-01-04 devnull 			qunlock(&fs->lk);
262 46f79934 2005-01-04 devnull 			return nil;
263 46f79934 2005-01-04 devnull 		}
264 46f79934 2005-01-04 devnull 		for(i=0; i<CFidchunk; i++){
265 46f79934 2005-01-04 devnull 			f[i].fid = fs->nextfid++;
266 46f79934 2005-01-04 devnull 			f[i].next = &f[i+1];
267 46f79934 2005-01-04 devnull 			f[i].fs = fs;
268 46f79934 2005-01-04 devnull 		}
269 46f79934 2005-01-04 devnull 		f[i-1].next = nil;
270 46f79934 2005-01-04 devnull 		fs->freefid = f;
271 46f79934 2005-01-04 devnull 	}
272 46f79934 2005-01-04 devnull 	f = fs->freefid;
273 46f79934 2005-01-04 devnull 	fs->freefid = f->next;
274 46f79934 2005-01-04 devnull 	fs->ref++;
275 46f79934 2005-01-04 devnull 	qunlock(&fs->lk);
276 33baa59e 2005-01-28 devnull 	f->offset = 0;
277 33baa59e 2005-01-28 devnull 	f->mode = -1;
278 33baa59e 2005-01-28 devnull 	f->qid.path = 0;
279 33baa59e 2005-01-28 devnull 	f->qid.vers = 0;
280 33baa59e 2005-01-28 devnull 	f->qid.type = 0;
281 46f79934 2005-01-04 devnull 	return f;
282 46f79934 2005-01-04 devnull }
283 46f79934 2005-01-04 devnull 
284 46f79934 2005-01-04 devnull void
285 46f79934 2005-01-04 devnull _fsputfid(CFid *f)
286 46f79934 2005-01-04 devnull {
287 46f79934 2005-01-04 devnull 	CFsys *fs;
288 46f79934 2005-01-04 devnull 
289 46f79934 2005-01-04 devnull 	fs = f->fs;
290 46f79934 2005-01-04 devnull 	qlock(&fs->lk);
291 46f79934 2005-01-04 devnull 	f->next = fs->freefid;
292 46f79934 2005-01-04 devnull 	fs->freefid = f;
293 46f79934 2005-01-04 devnull 	qunlock(&fs->lk);
294 46f79934 2005-01-04 devnull 	_fsdecref(fs);
295 46f79934 2005-01-04 devnull }
296 46f79934 2005-01-04 devnull 
297 46f79934 2005-01-04 devnull static int
298 46f79934 2005-01-04 devnull _fsgettag(Mux *mux, void *pkt)
299 46f79934 2005-01-04 devnull {
300 46f79934 2005-01-04 devnull 	return GBIT16((uchar*)pkt+5);
301 46f79934 2005-01-04 devnull }
302 46f79934 2005-01-04 devnull 
303 46f79934 2005-01-04 devnull static int
304 46f79934 2005-01-04 devnull _fssettag(Mux *mux, void *pkt, uint tag)
305 46f79934 2005-01-04 devnull {
306 46f79934 2005-01-04 devnull 	PBIT16((uchar*)pkt+5, tag);
307 46f79934 2005-01-04 devnull 	return 0;
308 46f79934 2005-01-04 devnull }
309 46f79934 2005-01-04 devnull 
310 46f79934 2005-01-04 devnull static int
311 46f79934 2005-01-04 devnull _fssend(Mux *mux, void *pkt)
312 46f79934 2005-01-04 devnull {
313 46f79934 2005-01-04 devnull 	CFsys *fs;
314 46f79934 2005-01-04 devnull 
315 46f79934 2005-01-04 devnull 	fs = mux->aux;
316 46f79934 2005-01-04 devnull 	return iowrite(fs->iosend, fs->fd, pkt, GBIT32((uchar*)pkt));
317 46f79934 2005-01-04 devnull }
318 46f79934 2005-01-04 devnull 
319 46f79934 2005-01-04 devnull static void*
320 46f79934 2005-01-04 devnull _fsrecv(Mux *mux)
321 46f79934 2005-01-04 devnull {
322 46f79934 2005-01-04 devnull 	uchar *pkt;
323 46f79934 2005-01-04 devnull 	uchar buf[4];
324 46f79934 2005-01-04 devnull 	int n, nfd;
325 46f79934 2005-01-04 devnull 	CFsys *fs;
326 46f79934 2005-01-04 devnull 
327 46f79934 2005-01-04 devnull 	fs = mux->aux;
328 46f79934 2005-01-04 devnull 	n = ioreadn(fs->iorecv, fs->fd, buf, 4);
329 46f79934 2005-01-04 devnull 	if(n != 4)
330 46f79934 2005-01-04 devnull 		return nil;
331 46f79934 2005-01-04 devnull 	n = GBIT32(buf);
332 46f79934 2005-01-04 devnull 	pkt = malloc(n+4);
333 46f79934 2005-01-04 devnull 	if(pkt == nil){
334 46f79934 2005-01-04 devnull 		fprint(2, "libfs out of memory reading 9p packet; here comes trouble\n");
335 46f79934 2005-01-04 devnull 		return nil;
336 46f79934 2005-01-04 devnull 	}
337 46f79934 2005-01-04 devnull 	PBIT32(pkt, n);
338 46f79934 2005-01-04 devnull 	if(ioreadn(fs->iorecv, fs->fd, pkt+4, n-4) != n-4){
339 46f79934 2005-01-04 devnull 		free(pkt);
340 46f79934 2005-01-04 devnull 		return nil;
341 46f79934 2005-01-04 devnull 	}
342 46f79934 2005-01-04 devnull 	if(pkt[4] == Ropenfd){
343 46f79934 2005-01-04 devnull 		if((nfd=iorecvfd(fs->iorecv, fs->fd)) < 0){
344 46f79934 2005-01-04 devnull 			fprint(2, "recv fd error: %r\n");
345 46f79934 2005-01-04 devnull 			free(pkt);
346 46f79934 2005-01-04 devnull 			return nil;
347 46f79934 2005-01-04 devnull 		}
348 46f79934 2005-01-04 devnull 		PBIT32(pkt+n-4, nfd);
349 46f79934 2005-01-04 devnull 	}
350 46f79934 2005-01-04 devnull 	return pkt;
351 46f79934 2005-01-04 devnull }