1 2277c5d7 2004-03-21 devnull #include <u.h>
  2 2277c5d7 2004-03-21 devnull #include <libc.h>
  3 2277c5d7 2004-03-21 devnull #include <auth.h>
  4 2277c5d7 2004-03-21 devnull #include <fcall.h>
  5 2277c5d7 2004-03-21 devnull #include <thread.h>
  6 2277c5d7 2004-03-21 devnull #include <9p.h>
  7 2277c5d7 2004-03-21 devnull 
  8 2277c5d7 2004-03-21 devnull /*
  9 2277c5d7 2004-03-21 devnull  * To avoid deadlock, the following rules must be followed.
 10 2277c5d7 2004-03-21 devnull  * Always lock child then parent, never parent then child.
 11 2277c5d7 2004-03-21 devnull  * If holding the free file lock, do not lock any Files.
 12 2277c5d7 2004-03-21 devnull  */
 13 2277c5d7 2004-03-21 devnull struct Filelist {
 14 2277c5d7 2004-03-21 devnull 	File *f;
 15 2277c5d7 2004-03-21 devnull 	Filelist *link;
 16 2277c5d7 2004-03-21 devnull };
 17 2277c5d7 2004-03-21 devnull 
 18 2277c5d7 2004-03-21 devnull static QLock filelk;
 19 2277c5d7 2004-03-21 devnull static File *freefilelist;
 20 2277c5d7 2004-03-21 devnull 
 21 2277c5d7 2004-03-21 devnull static File*
 22 2277c5d7 2004-03-21 devnull allocfile(void)
 23 2277c5d7 2004-03-21 devnull {
 24 2277c5d7 2004-03-21 devnull 	int i, a;
 25 2277c5d7 2004-03-21 devnull 	File *f;
 26 2277c5d7 2004-03-21 devnull 	enum { N = 16 };
 27 2277c5d7 2004-03-21 devnull 
 28 2277c5d7 2004-03-21 devnull 	qlock(&filelk);
 29 2277c5d7 2004-03-21 devnull 	if(freefilelist == nil){
 30 2277c5d7 2004-03-21 devnull 		f = emalloc9p(N*sizeof(*f));
 31 2277c5d7 2004-03-21 devnull 		for(i=0; i<N-1; i++)
 32 2277c5d7 2004-03-21 devnull 			f[i].aux = &f[i+1];
 33 2277c5d7 2004-03-21 devnull 		f[N-1].aux = nil;
 34 2277c5d7 2004-03-21 devnull 		f[0].allocd = 1;
 35 2277c5d7 2004-03-21 devnull 		freefilelist = f;
 36 2277c5d7 2004-03-21 devnull 	}
 37 2277c5d7 2004-03-21 devnull 
 38 2277c5d7 2004-03-21 devnull 	f = freefilelist;
 39 2277c5d7 2004-03-21 devnull 	freefilelist = f->aux;
 40 2277c5d7 2004-03-21 devnull 	qunlock(&filelk);
 41 2277c5d7 2004-03-21 devnull 
 42 2277c5d7 2004-03-21 devnull 	a = f->allocd;
 43 2277c5d7 2004-03-21 devnull 	memset(f, 0, sizeof *f);
 44 2277c5d7 2004-03-21 devnull 	f->allocd = a;
 45 2277c5d7 2004-03-21 devnull 	return f;
 46 2277c5d7 2004-03-21 devnull }
 47 2277c5d7 2004-03-21 devnull 
 48 2277c5d7 2004-03-21 devnull static void
 49 2277c5d7 2004-03-21 devnull freefile(File *f)
 50 2277c5d7 2004-03-21 devnull {
 51 2277c5d7 2004-03-21 devnull 	Filelist *fl, *flnext;
 52 2277c5d7 2004-03-21 devnull 
 53 2277c5d7 2004-03-21 devnull 	for(fl=f->filelist; fl; fl=flnext){
 54 2277c5d7 2004-03-21 devnull 		flnext = fl->link;
 55 2277c5d7 2004-03-21 devnull 		assert(fl->f == nil);
 56 2277c5d7 2004-03-21 devnull 		free(fl);
 57 2277c5d7 2004-03-21 devnull 	}
 58 2277c5d7 2004-03-21 devnull 
 59 2277c5d7 2004-03-21 devnull 	free(f->dir.name);
 60 2277c5d7 2004-03-21 devnull 	free(f->dir.uid);
 61 2277c5d7 2004-03-21 devnull 	free(f->dir.gid);
 62 2277c5d7 2004-03-21 devnull 	free(f->dir.muid);
 63 2277c5d7 2004-03-21 devnull 	qlock(&filelk);
 64 2277c5d7 2004-03-21 devnull 	assert(f->ref.ref == 0);
 65 2277c5d7 2004-03-21 devnull 	f->aux = freefilelist;
 66 2277c5d7 2004-03-21 devnull 	freefilelist = f;
 67 2277c5d7 2004-03-21 devnull 	qunlock(&filelk);
 68 2277c5d7 2004-03-21 devnull }
 69 2277c5d7 2004-03-21 devnull 
 70 2277c5d7 2004-03-21 devnull void
 71 2277c5d7 2004-03-21 devnull closefile(File *f)
 72 2277c5d7 2004-03-21 devnull {
 73 2277c5d7 2004-03-21 devnull 	if(decref(&f->ref) == 0){
 74 2277c5d7 2004-03-21 devnull 		f->tree->destroy(f);
 75 2277c5d7 2004-03-21 devnull 		freefile(f);
 76 2277c5d7 2004-03-21 devnull 	}
 77 2277c5d7 2004-03-21 devnull }
 78 2277c5d7 2004-03-21 devnull 
 79 2277c5d7 2004-03-21 devnull static void
 80 2277c5d7 2004-03-21 devnull nop(File *f)
 81 2277c5d7 2004-03-21 devnull {
 82 2277c5d7 2004-03-21 devnull 	USED(f);
 83 2277c5d7 2004-03-21 devnull }
 84 2277c5d7 2004-03-21 devnull 
 85 2277c5d7 2004-03-21 devnull int
 86 2277c5d7 2004-03-21 devnull removefile(File *f)
 87 2277c5d7 2004-03-21 devnull {
 88 2277c5d7 2004-03-21 devnull 	File *fp;
 89 2277c5d7 2004-03-21 devnull 	Filelist *fl;
 90 2277c5d7 2004-03-21 devnull 	
 91 2277c5d7 2004-03-21 devnull 	fp = f->parent;
 92 2277c5d7 2004-03-21 devnull 	if(fp == nil){
 93 2277c5d7 2004-03-21 devnull 		werrstr("no parent");
 94 2277c5d7 2004-03-21 devnull 		closefile(f);
 95 2277c5d7 2004-03-21 devnull 		return -1;
 96 2277c5d7 2004-03-21 devnull 	}
 97 2277c5d7 2004-03-21 devnull 
 98 2277c5d7 2004-03-21 devnull 	if(fp == f){
 99 2277c5d7 2004-03-21 devnull 		werrstr("cannot remove root");
100 2277c5d7 2004-03-21 devnull 		closefile(f);
101 2277c5d7 2004-03-21 devnull 		return -1;
102 2277c5d7 2004-03-21 devnull 	}
103 2277c5d7 2004-03-21 devnull 
104 2277c5d7 2004-03-21 devnull 	wlock(&fp->rwlock);
105 2277c5d7 2004-03-21 devnull 	wlock(&f->rwlock);
106 2277c5d7 2004-03-21 devnull 	if(f->nchild != 0){
107 2277c5d7 2004-03-21 devnull 		werrstr("has children");
108 2277c5d7 2004-03-21 devnull 		wunlock(&f->rwlock);
109 2277c5d7 2004-03-21 devnull 		wunlock(&fp->rwlock);
110 2277c5d7 2004-03-21 devnull 		closefile(f);
111 2277c5d7 2004-03-21 devnull 		return -1;
112 2277c5d7 2004-03-21 devnull 	}
113 2277c5d7 2004-03-21 devnull 
114 2277c5d7 2004-03-21 devnull 	if(f->parent != fp){
115 2277c5d7 2004-03-21 devnull 		werrstr("parent changed underfoot");
116 2277c5d7 2004-03-21 devnull 		wunlock(&f->rwlock);
117 2277c5d7 2004-03-21 devnull 		wunlock(&fp->rwlock);
118 2277c5d7 2004-03-21 devnull 		closefile(f);
119 2277c5d7 2004-03-21 devnull 		return -1;
120 2277c5d7 2004-03-21 devnull 	}
121 2277c5d7 2004-03-21 devnull 
122 2277c5d7 2004-03-21 devnull 	for(fl=fp->filelist; fl; fl=fl->link)
123 2277c5d7 2004-03-21 devnull 		if(fl->f == f)
124 2277c5d7 2004-03-21 devnull 			break;
125 2277c5d7 2004-03-21 devnull 	assert(fl != nil && fl->f == f);
126 2277c5d7 2004-03-21 devnull 
127 2277c5d7 2004-03-21 devnull 	fl->f = nil;
128 2277c5d7 2004-03-21 devnull 	fp->nchild--;
129 2277c5d7 2004-03-21 devnull 	f->parent = nil;
130 2277c5d7 2004-03-21 devnull 	wunlock(&fp->rwlock);
131 2277c5d7 2004-03-21 devnull 	wunlock(&f->rwlock);
132 2277c5d7 2004-03-21 devnull 
133 2277c5d7 2004-03-21 devnull 	closefile(fp);	/* reference from child */
134 2277c5d7 2004-03-21 devnull 	closefile(f);	/* reference from tree */
135 2277c5d7 2004-03-21 devnull 	closefile(f);
136 2277c5d7 2004-03-21 devnull 	return 0;
137 2277c5d7 2004-03-21 devnull }
138 2277c5d7 2004-03-21 devnull 
139 2277c5d7 2004-03-21 devnull File*
140 2277c5d7 2004-03-21 devnull createfile(File *fp, char *name, char *uid, ulong perm, void *aux)
141 2277c5d7 2004-03-21 devnull {
142 2277c5d7 2004-03-21 devnull 	File *f;
143 2277c5d7 2004-03-21 devnull 	Filelist *fl, *freel;
144 2277c5d7 2004-03-21 devnull 	Tree *t;
145 2277c5d7 2004-03-21 devnull 
146 2277c5d7 2004-03-21 devnull 	if((fp->dir.qid.type&QTDIR) == 0){
147 2277c5d7 2004-03-21 devnull 		werrstr("create in non-directory");
148 2277c5d7 2004-03-21 devnull 		return nil;
149 2277c5d7 2004-03-21 devnull 	}
150 2277c5d7 2004-03-21 devnull 
151 2277c5d7 2004-03-21 devnull 	freel = nil;
152 2277c5d7 2004-03-21 devnull 	wlock(&fp->rwlock);
153 2277c5d7 2004-03-21 devnull 	for(fl=fp->filelist; fl; fl=fl->link){
154 2277c5d7 2004-03-21 devnull 		if(fl->f == nil)
155 2277c5d7 2004-03-21 devnull 			freel = fl;
156 2277c5d7 2004-03-21 devnull 		else if(strcmp(fl->f->dir.name, name) == 0){
157 2277c5d7 2004-03-21 devnull 			wunlock(&fp->rwlock);
158 2277c5d7 2004-03-21 devnull 			werrstr("file already exists");
159 2277c5d7 2004-03-21 devnull 			return nil;
160 2277c5d7 2004-03-21 devnull 		}
161 2277c5d7 2004-03-21 devnull 	}
162 2277c5d7 2004-03-21 devnull 
163 2277c5d7 2004-03-21 devnull 	if(freel == nil){
164 2277c5d7 2004-03-21 devnull 		freel = emalloc9p(sizeof *freel);
165 2277c5d7 2004-03-21 devnull 		freel->link = fp->filelist;
166 2277c5d7 2004-03-21 devnull 		fp->filelist = freel;
167 2277c5d7 2004-03-21 devnull 	}
168 2277c5d7 2004-03-21 devnull 
169 2277c5d7 2004-03-21 devnull 	f = allocfile();
170 2277c5d7 2004-03-21 devnull 	f->dir.name = estrdup9p(name);
171 2277c5d7 2004-03-21 devnull 	f->dir.uid = estrdup9p(uid ? uid : fp->dir.uid);
172 2277c5d7 2004-03-21 devnull 	f->dir.gid = estrdup9p(fp->dir.gid);
173 2277c5d7 2004-03-21 devnull 	f->dir.muid = estrdup9p(uid ? uid : "unknown");
174 2277c5d7 2004-03-21 devnull 	f->aux = aux;
175 2277c5d7 2004-03-21 devnull 	f->dir.mode = perm;
176 2277c5d7 2004-03-21 devnull 
177 2277c5d7 2004-03-21 devnull 	t = fp->tree;
178 2277c5d7 2004-03-21 devnull 	lock(&t->genlock);
179 2277c5d7 2004-03-21 devnull 	f->dir.qid.path = t->qidgen++;
180 2277c5d7 2004-03-21 devnull 	unlock(&t->genlock);
181 2277c5d7 2004-03-21 devnull 	if(perm & DMDIR)
182 2277c5d7 2004-03-21 devnull 		f->dir.qid.type |= QTDIR;
183 2277c5d7 2004-03-21 devnull 	if(perm & DMAPPEND)
184 2277c5d7 2004-03-21 devnull 		f->dir.qid.type |= QTAPPEND;
185 2277c5d7 2004-03-21 devnull 	if(perm & DMEXCL)
186 2277c5d7 2004-03-21 devnull 		f->dir.qid.type |= QTEXCL;
187 2277c5d7 2004-03-21 devnull 
188 2277c5d7 2004-03-21 devnull 	f->dir.mode = perm;
189 2277c5d7 2004-03-21 devnull 	f->dir.atime = f->dir.mtime = time(0);
190 2277c5d7 2004-03-21 devnull 	f->dir.length = 0;
191 2277c5d7 2004-03-21 devnull 	f->parent = fp;
192 2277c5d7 2004-03-21 devnull 	incref(&fp->ref);
193 2277c5d7 2004-03-21 devnull 	f->tree = fp->tree;
194 2277c5d7 2004-03-21 devnull 
195 2277c5d7 2004-03-21 devnull 	incref(&f->ref);	/* being returned */
196 2277c5d7 2004-03-21 devnull 	incref(&f->ref);	/* for the tree */
197 2277c5d7 2004-03-21 devnull 	freel->f = f;
198 2277c5d7 2004-03-21 devnull 	fp->nchild++;
199 2277c5d7 2004-03-21 devnull 	wunlock(&fp->rwlock);
200 2277c5d7 2004-03-21 devnull 
201 2277c5d7 2004-03-21 devnull 	return f;
202 2277c5d7 2004-03-21 devnull }
203 2277c5d7 2004-03-21 devnull 
204 2277c5d7 2004-03-21 devnull static File*
205 2277c5d7 2004-03-21 devnull walkfile1(File *dir, char *elem)
206 2277c5d7 2004-03-21 devnull {
207 2277c5d7 2004-03-21 devnull 	File *fp;
208 2277c5d7 2004-03-21 devnull 	Filelist *fl;
209 2277c5d7 2004-03-21 devnull 
210 2277c5d7 2004-03-21 devnull 	rlock(&dir->rwlock);
211 2277c5d7 2004-03-21 devnull 	if(strcmp(elem, "..") == 0){
212 2277c5d7 2004-03-21 devnull 		fp = dir->parent;
213 2277c5d7 2004-03-21 devnull 		incref(&fp->ref);
214 2277c5d7 2004-03-21 devnull 		runlock(&dir->rwlock);
215 2277c5d7 2004-03-21 devnull 		closefile(dir);
216 2277c5d7 2004-03-21 devnull 		return fp;
217 2277c5d7 2004-03-21 devnull 	}
218 2277c5d7 2004-03-21 devnull 
219 2277c5d7 2004-03-21 devnull 	fp = nil;
220 2277c5d7 2004-03-21 devnull 	for(fl=dir->filelist; fl; fl=fl->link)
221 2277c5d7 2004-03-21 devnull 		if(fl->f && strcmp(fl->f->dir.name, elem)==0){
222 2277c5d7 2004-03-21 devnull 			fp = fl->f;
223 2277c5d7 2004-03-21 devnull 			incref(&fp->ref);
224 2277c5d7 2004-03-21 devnull 			break;
225 2277c5d7 2004-03-21 devnull 		}
226 2277c5d7 2004-03-21 devnull 
227 2277c5d7 2004-03-21 devnull 	runlock(&dir->rwlock);
228 2277c5d7 2004-03-21 devnull 	closefile(dir);
229 2277c5d7 2004-03-21 devnull 	return fp;
230 2277c5d7 2004-03-21 devnull }
231 2277c5d7 2004-03-21 devnull 
232 2277c5d7 2004-03-21 devnull File*
233 2277c5d7 2004-03-21 devnull walkfile(File *f, char *path)
234 2277c5d7 2004-03-21 devnull {
235 2277c5d7 2004-03-21 devnull 	char *os, *s, *nexts;
236 2277c5d7 2004-03-21 devnull 	File *nf;
237 2277c5d7 2004-03-21 devnull 
238 2277c5d7 2004-03-21 devnull 	if(strchr(path, '/') == nil)
239 2277c5d7 2004-03-21 devnull 		return walkfile1(f, path);	/* avoid malloc */
240 2277c5d7 2004-03-21 devnull 
241 2277c5d7 2004-03-21 devnull 	os = s = estrdup9p(path);
242 2277c5d7 2004-03-21 devnull 	incref(&f->ref);
243 2277c5d7 2004-03-21 devnull 	for(; *s; s=nexts){
244 2277c5d7 2004-03-21 devnull 		if(nexts = strchr(s, '/'))
245 2277c5d7 2004-03-21 devnull 			*nexts++ = '\0';
246 2277c5d7 2004-03-21 devnull 		else
247 2277c5d7 2004-03-21 devnull 			nexts = s+strlen(s);
248 2277c5d7 2004-03-21 devnull 		nf = walkfile1(f, s);
249 2277c5d7 2004-03-21 devnull 		decref(&f->ref);
250 2277c5d7 2004-03-21 devnull 		f = nf;
251 2277c5d7 2004-03-21 devnull 		if(f == nil)
252 2277c5d7 2004-03-21 devnull 			break;
253 2277c5d7 2004-03-21 devnull 	}
254 2277c5d7 2004-03-21 devnull 	free(os);
255 2277c5d7 2004-03-21 devnull 	return f;
256 a0f1e21f 2004-04-20 devnull }
257 a0f1e21f 2004-04-20 devnull 
258 a0f1e21f 2004-04-20 devnull static Qid
259 a0f1e21f 2004-04-20 devnull mkqid(vlong path, long vers, int type)
260 a0f1e21f 2004-04-20 devnull {
261 a0f1e21f 2004-04-20 devnull 	Qid q;
262 a0f1e21f 2004-04-20 devnull 
263 a0f1e21f 2004-04-20 devnull 	q.path = path;
264 a0f1e21f 2004-04-20 devnull 	q.vers = vers;
265 a0f1e21f 2004-04-20 devnull 	q.type = type;
266 a0f1e21f 2004-04-20 devnull 	return q;
267 2277c5d7 2004-03-21 devnull }
268 a0f1e21f 2004-04-20 devnull 
269 2277c5d7 2004-03-21 devnull 			
270 2277c5d7 2004-03-21 devnull Tree*
271 2277c5d7 2004-03-21 devnull alloctree(char *uid, char *gid, ulong mode, void (*destroy)(File*))
272 2277c5d7 2004-03-21 devnull {
273 2277c5d7 2004-03-21 devnull 	char *muid;
274 2277c5d7 2004-03-21 devnull 	Tree *t;
275 2277c5d7 2004-03-21 devnull 	File *f;
276 2277c5d7 2004-03-21 devnull 
277 2277c5d7 2004-03-21 devnull 	t = emalloc9p(sizeof *t);
278 2277c5d7 2004-03-21 devnull 	f = allocfile();
279 2277c5d7 2004-03-21 devnull 	f->dir.name = estrdup9p("/");
280 2277c5d7 2004-03-21 devnull 	if(uid == nil){
281 2277c5d7 2004-03-21 devnull 		if(uid = getuser())
282 2277c5d7 2004-03-21 devnull 			uid = estrdup9p(uid);
283 2277c5d7 2004-03-21 devnull 	}
284 2277c5d7 2004-03-21 devnull 	if(uid == nil)
285 2277c5d7 2004-03-21 devnull 		uid = estrdup9p("none");
286 2277c5d7 2004-03-21 devnull 	else
287 2277c5d7 2004-03-21 devnull 		uid = estrdup9p(uid);
288 2277c5d7 2004-03-21 devnull 
289 2277c5d7 2004-03-21 devnull 	if(gid == nil)
290 2277c5d7 2004-03-21 devnull 		gid = estrdup9p(uid);
291 2277c5d7 2004-03-21 devnull 	else
292 2277c5d7 2004-03-21 devnull 		gid = estrdup9p(gid);
293 2277c5d7 2004-03-21 devnull 
294 2277c5d7 2004-03-21 devnull 	muid = estrdup9p(uid);
295 2277c5d7 2004-03-21 devnull 
296 a0f1e21f 2004-04-20 devnull 	f->dir.qid = mkqid(0, 0, QTDIR);
297 2277c5d7 2004-03-21 devnull 	f->dir.length = 0;
298 2277c5d7 2004-03-21 devnull 	f->dir.atime = f->dir.mtime = time(0);
299 2277c5d7 2004-03-21 devnull 	f->dir.mode = DMDIR | mode;
300 2277c5d7 2004-03-21 devnull 	f->tree = t;
301 2277c5d7 2004-03-21 devnull 	f->parent = f;
302 2277c5d7 2004-03-21 devnull 	f->dir.uid = uid;
303 2277c5d7 2004-03-21 devnull 	f->dir.gid = gid;
304 2277c5d7 2004-03-21 devnull 	f->dir.muid = muid;
305 2277c5d7 2004-03-21 devnull 
306 2277c5d7 2004-03-21 devnull 	incref(&f->ref);
307 2277c5d7 2004-03-21 devnull 	t->root = f;
308 2277c5d7 2004-03-21 devnull 	t->qidgen = 0;
309 2277c5d7 2004-03-21 devnull 	t->dirqidgen = 1;
310 2277c5d7 2004-03-21 devnull 	if(destroy == nil)
311 2277c5d7 2004-03-21 devnull 		destroy = nop;
312 2277c5d7 2004-03-21 devnull 	t->destroy = destroy;
313 2277c5d7 2004-03-21 devnull 
314 2277c5d7 2004-03-21 devnull 	return t;
315 2277c5d7 2004-03-21 devnull }
316 2277c5d7 2004-03-21 devnull 
317 2277c5d7 2004-03-21 devnull static void
318 2277c5d7 2004-03-21 devnull _freefiles(File *f)
319 2277c5d7 2004-03-21 devnull {
320 2277c5d7 2004-03-21 devnull 	Filelist *fl, *flnext;
321 2277c5d7 2004-03-21 devnull 
322 2277c5d7 2004-03-21 devnull 	for(fl=f->filelist; fl; fl=flnext){
323 2277c5d7 2004-03-21 devnull 		flnext = fl->link;
324 2277c5d7 2004-03-21 devnull 		_freefiles(fl->f);
325 2277c5d7 2004-03-21 devnull 		free(fl);
326 2277c5d7 2004-03-21 devnull 	}
327 2277c5d7 2004-03-21 devnull 
328 2277c5d7 2004-03-21 devnull 	f->tree->destroy(f);
329 2277c5d7 2004-03-21 devnull 	freefile(f);
330 2277c5d7 2004-03-21 devnull }
331 2277c5d7 2004-03-21 devnull 
332 2277c5d7 2004-03-21 devnull void
333 2277c5d7 2004-03-21 devnull freetree(Tree *t)
334 2277c5d7 2004-03-21 devnull {
335 2277c5d7 2004-03-21 devnull 	_freefiles(t->root);
336 2277c5d7 2004-03-21 devnull 	free(t);
337 2277c5d7 2004-03-21 devnull }
338 2277c5d7 2004-03-21 devnull 
339 2277c5d7 2004-03-21 devnull struct Readdir {
340 2277c5d7 2004-03-21 devnull 	Filelist *fl;
341 2277c5d7 2004-03-21 devnull };
342 2277c5d7 2004-03-21 devnull 
343 2277c5d7 2004-03-21 devnull Readdir*
344 2277c5d7 2004-03-21 devnull opendirfile(File *dir)
345 2277c5d7 2004-03-21 devnull {
346 2277c5d7 2004-03-21 devnull 	Readdir *r;
347 2277c5d7 2004-03-21 devnull 
348 2277c5d7 2004-03-21 devnull 	rlock(&dir->rwlock);
349 2277c5d7 2004-03-21 devnull 	if((dir->dir.mode & DMDIR)==0){
350 2277c5d7 2004-03-21 devnull 		runlock(&dir->rwlock);
351 2277c5d7 2004-03-21 devnull 		return nil;
352 2277c5d7 2004-03-21 devnull 	}
353 2277c5d7 2004-03-21 devnull 	r = emalloc9p(sizeof(*r));
354 2277c5d7 2004-03-21 devnull 
355 2277c5d7 2004-03-21 devnull 	/*
356 2277c5d7 2004-03-21 devnull 	 * This reference won't go away while we're using it
357 2277c5d7 2004-03-21 devnull 	 * since we are dir->rdir.
358 2277c5d7 2004-03-21 devnull 	 */
359 2277c5d7 2004-03-21 devnull 	r->fl = dir->filelist;
360 2277c5d7 2004-03-21 devnull 	runlock(&dir->rwlock);
361 2277c5d7 2004-03-21 devnull 	return r;
362 2277c5d7 2004-03-21 devnull }
363 2277c5d7 2004-03-21 devnull 
364 2277c5d7 2004-03-21 devnull long
365 2277c5d7 2004-03-21 devnull readdirfile(Readdir *r, uchar *buf, long n)
366 2277c5d7 2004-03-21 devnull {
367 2277c5d7 2004-03-21 devnull 	long x, m;
368 2277c5d7 2004-03-21 devnull 	Filelist *fl;
369 2277c5d7 2004-03-21 devnull 
370 2277c5d7 2004-03-21 devnull 	for(fl=r->fl, m=0; fl && m+2<=n; fl=fl->link, m+=x){
371 2277c5d7 2004-03-21 devnull 		if(fl->f == nil)
372 2277c5d7 2004-03-21 devnull 			x = 0;
373 2277c5d7 2004-03-21 devnull 		else if((x=convD2M(&fl->f->dir, buf+m, n-m)) <= BIT16SZ)
374 2277c5d7 2004-03-21 devnull 			break;
375 2277c5d7 2004-03-21 devnull 	}
376 2277c5d7 2004-03-21 devnull 	r->fl = fl;
377 2277c5d7 2004-03-21 devnull 	return m;
378 2277c5d7 2004-03-21 devnull }
379 2277c5d7 2004-03-21 devnull 
380 2277c5d7 2004-03-21 devnull void
381 2277c5d7 2004-03-21 devnull closedirfile(Readdir *r)
382 2277c5d7 2004-03-21 devnull {
383 2277c5d7 2004-03-21 devnull 	free(r);
384 2277c5d7 2004-03-21 devnull }