null.c revision 1.22 1 1.22 pooka /* $NetBSD: null.c,v 1.22 2007/11/05 16:53:00 pooka Exp $ */
2 1.1 pooka
3 1.1 pooka /*
4 1.1 pooka * Copyright (c) 2007 Antti Kantee. All Rights Reserved.
5 1.1 pooka *
6 1.1 pooka * Redistribution and use in source and binary forms, with or without
7 1.1 pooka * modification, are permitted provided that the following conditions
8 1.1 pooka * are met:
9 1.1 pooka * 1. Redistributions of source code must retain the above copyright
10 1.1 pooka * notice, this list of conditions and the following disclaimer.
11 1.1 pooka * 2. Redistributions in binary form must reproduce the above copyright
12 1.1 pooka * notice, this list of conditions and the following disclaimer in the
13 1.1 pooka * documentation and/or other materials provided with the distribution.
14 1.1 pooka *
15 1.1 pooka * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
16 1.1 pooka * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
17 1.1 pooka * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 1.1 pooka * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 1.1 pooka * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 1.1 pooka * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 1.1 pooka * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 1.1 pooka * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 1.1 pooka * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 1.1 pooka * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 1.1 pooka * SUCH DAMAGE.
26 1.1 pooka */
27 1.1 pooka
28 1.1 pooka #include <sys/cdefs.h>
29 1.1 pooka #if !defined(lint)
30 1.22 pooka __RCSID("$NetBSD: null.c,v 1.22 2007/11/05 16:53:00 pooka Exp $");
31 1.1 pooka #endif /* !lint */
32 1.1 pooka
33 1.1 pooka /*
34 1.1 pooka * A "nullfs" using puffs, i.e. maps one location in the hierarchy
35 1.1 pooka * to another using standard system calls.
36 1.1 pooka */
37 1.1 pooka
38 1.1 pooka #include <sys/types.h>
39 1.1 pooka #include <sys/time.h>
40 1.1 pooka
41 1.1 pooka #include <assert.h>
42 1.1 pooka #include <dirent.h>
43 1.1 pooka #include <errno.h>
44 1.1 pooka #include <fcntl.h>
45 1.1 pooka #include <puffs.h>
46 1.1 pooka #include <stdio.h>
47 1.9 pooka #include <stdlib.h>
48 1.1 pooka #include <unistd.h>
49 1.1 pooka
50 1.1 pooka PUFFSOP_PROTOS(puffs_null)
51 1.1 pooka
52 1.1 pooka /*
53 1.1 pooka * set attributes to what is specified. XXX: no rollback in case of failure
54 1.1 pooka */
55 1.1 pooka static int
56 1.2 pooka processvattr(const char *path, const struct vattr *va, int regular)
57 1.1 pooka {
58 1.1 pooka struct timeval tv[2];
59 1.1 pooka
60 1.1 pooka /* XXX: -1 == PUFFS_VNOVAL, but shouldn't trust that */
61 1.1 pooka if (va->va_uid != (unsigned)-1 || va->va_gid != (unsigned)-1)
62 1.2 pooka if (lchown(path, va->va_uid, va->va_gid) == -1)
63 1.1 pooka return errno;
64 1.1 pooka
65 1.1 pooka if (va->va_mode != (unsigned)PUFFS_VNOVAL)
66 1.2 pooka if (lchmod(path, va->va_mode) == -1)
67 1.1 pooka return errno;
68 1.1 pooka
69 1.1 pooka /* sloppy */
70 1.1 pooka if (va->va_atime.tv_sec != (unsigned)PUFFS_VNOVAL
71 1.1 pooka || va->va_mtime.tv_sec != (unsigned)PUFFS_VNOVAL) {
72 1.1 pooka TIMESPEC_TO_TIMEVAL(&tv[0], &va->va_atime);
73 1.1 pooka TIMESPEC_TO_TIMEVAL(&tv[1], &va->va_mtime);
74 1.1 pooka
75 1.1 pooka if (lutimes(path, tv) == -1)
76 1.1 pooka return errno;
77 1.1 pooka }
78 1.1 pooka
79 1.2 pooka if (regular && va->va_size != (u_quad_t)PUFFS_VNOVAL)
80 1.1 pooka if (truncate(path, (off_t)va->va_size) == -1)
81 1.1 pooka return errno;
82 1.1 pooka
83 1.1 pooka return 0;
84 1.1 pooka }
85 1.1 pooka
86 1.3 pooka /*
87 1.3 pooka * Kludge to open files which aren't writable *any longer*. This kinda
88 1.3 pooka * works because the vfs layer does validation checks based on the file's
89 1.3 pooka * permissions to allow writable opening before opening them. However,
90 1.3 pooka * the problem arises if we want to create a file, write to it (cache),
91 1.3 pooka * adjust permissions and then flush the file.
92 1.3 pooka */
93 1.3 pooka static int
94 1.3 pooka writeableopen(const char *path)
95 1.3 pooka {
96 1.3 pooka struct stat sb;
97 1.3 pooka mode_t origmode;
98 1.3 pooka int sverr = 0;
99 1.3 pooka int fd;
100 1.3 pooka
101 1.3 pooka fd = open(path, O_WRONLY);
102 1.3 pooka if (fd == -1) {
103 1.3 pooka if (errno == EACCES) {
104 1.3 pooka if (stat(path, &sb) == -1)
105 1.15 pooka return -1;
106 1.3 pooka origmode = sb.st_mode & ALLPERMS;
107 1.3 pooka
108 1.3 pooka if (chmod(path, 0200) == -1)
109 1.15 pooka return -1;
110 1.3 pooka
111 1.3 pooka fd = open(path, O_WRONLY);
112 1.3 pooka if (fd == -1)
113 1.3 pooka sverr = errno;
114 1.3 pooka
115 1.3 pooka chmod(path, origmode);
116 1.3 pooka if (sverr)
117 1.3 pooka errno = sverr;
118 1.3 pooka } else
119 1.15 pooka return -1;
120 1.3 pooka }
121 1.3 pooka
122 1.3 pooka return fd;
123 1.3 pooka }
124 1.3 pooka
125 1.1 pooka /*ARGSUSED*/
126 1.9 pooka static void *
127 1.9 pooka inodecmp(struct puffs_usermount *pu, struct puffs_node *pn, void *arg)
128 1.9 pooka {
129 1.9 pooka ino_t *cmpino = arg;
130 1.9 pooka
131 1.9 pooka if (pn->pn_va.va_fileid == *cmpino)
132 1.9 pooka return pn;
133 1.9 pooka return NULL;
134 1.9 pooka }
135 1.9 pooka
136 1.19 pooka static int
137 1.21 pooka makenode(struct puffs_usermount *pu, struct puffs_newinfo *pni,
138 1.19 pooka const struct puffs_cn *pcn, const struct vattr *va, int regular)
139 1.19 pooka {
140 1.19 pooka struct puffs_node *pn;
141 1.19 pooka struct stat sb;
142 1.19 pooka int rv;
143 1.19 pooka
144 1.19 pooka if ((rv = processvattr(PCNPATH(pcn), va, regular)) != 0)
145 1.19 pooka return rv;
146 1.19 pooka
147 1.19 pooka pn = puffs_pn_new(pu, NULL);
148 1.19 pooka if (!pn)
149 1.19 pooka return ENOMEM;
150 1.19 pooka puffs_setvattr(&pn->pn_va, va);
151 1.19 pooka
152 1.19 pooka if (lstat(PCNPATH(pcn), &sb) == -1)
153 1.19 pooka return errno;
154 1.19 pooka puffs_stat2vattr(&pn->pn_va, &sb);
155 1.19 pooka
156 1.21 pooka puffs_newinfo_setcookie(pni, pn);
157 1.19 pooka return 0;
158 1.19 pooka }
159 1.19 pooka
160 1.17 pooka /* This should be called first and overriden from the file system */
161 1.17 pooka void
162 1.17 pooka puffs_null_setops(struct puffs_ops *pops)
163 1.17 pooka {
164 1.17 pooka
165 1.17 pooka PUFFSOP_SET(pops, puffs_null, fs, statvfs);
166 1.17 pooka PUFFSOP_SETFSNOP(pops, unmount);
167 1.17 pooka PUFFSOP_SETFSNOP(pops, sync);
168 1.17 pooka
169 1.17 pooka PUFFSOP_SET(pops, puffs_null, node, lookup);
170 1.17 pooka PUFFSOP_SET(pops, puffs_null, node, create);
171 1.17 pooka PUFFSOP_SET(pops, puffs_null, node, mknod);
172 1.17 pooka PUFFSOP_SET(pops, puffs_null, node, getattr);
173 1.17 pooka PUFFSOP_SET(pops, puffs_null, node, setattr);
174 1.17 pooka PUFFSOP_SET(pops, puffs_null, node, fsync);
175 1.17 pooka PUFFSOP_SET(pops, puffs_null, node, remove);
176 1.17 pooka PUFFSOP_SET(pops, puffs_null, node, link);
177 1.17 pooka PUFFSOP_SET(pops, puffs_null, node, rename);
178 1.17 pooka PUFFSOP_SET(pops, puffs_null, node, mkdir);
179 1.17 pooka PUFFSOP_SET(pops, puffs_null, node, rmdir);
180 1.17 pooka PUFFSOP_SET(pops, puffs_null, node, symlink);
181 1.17 pooka PUFFSOP_SET(pops, puffs_null, node, readlink);
182 1.17 pooka PUFFSOP_SET(pops, puffs_null, node, readdir);
183 1.17 pooka PUFFSOP_SET(pops, puffs_null, node, read);
184 1.17 pooka PUFFSOP_SET(pops, puffs_null, node, write);
185 1.22 pooka PUFFSOP_SET(pops, puffs_genfs, node, reclaim);
186 1.17 pooka }
187 1.17 pooka
188 1.9 pooka /*ARGSUSED*/
189 1.1 pooka int
190 1.20 pooka puffs_null_fs_statvfs(struct puffs_cc *pcc, struct statvfs *svfsb,
191 1.20 pooka const struct puffs_cid *pcid)
192 1.1 pooka {
193 1.1 pooka struct puffs_usermount *pu = puffs_cc_getusermount(pcc);
194 1.1 pooka
195 1.13 pooka if (statvfs(PNPATH(puffs_getroot(pu)), svfsb) == -1)
196 1.1 pooka return errno;
197 1.1 pooka
198 1.1 pooka return 0;
199 1.1 pooka }
200 1.1 pooka
201 1.1 pooka int
202 1.21 pooka puffs_null_node_lookup(struct puffs_cc *pcc, void *opc,
203 1.21 pooka struct puffs_newinfo *pni, const struct puffs_cn *pcn)
204 1.1 pooka {
205 1.1 pooka struct puffs_usermount *pu = puffs_cc_getusermount(pcc);
206 1.1 pooka struct puffs_node *pn = opc, *pn_res;
207 1.1 pooka struct stat sb;
208 1.1 pooka int rv;
209 1.1 pooka
210 1.1 pooka assert(pn->pn_va.va_type == VDIR);
211 1.1 pooka
212 1.6 pooka /*
213 1.6 pooka * Note to whoever is copypasting this: you must first check
214 1.6 pooka * if the node is there and only then do nodewalk. Alternatively
215 1.6 pooka * you could make sure that you don't return unlinked/rmdir'd
216 1.6 pooka * nodes in some other fashion
217 1.6 pooka */
218 1.6 pooka rv = lstat(PCNPATH(pcn), &sb);
219 1.1 pooka if (rv)
220 1.10 pooka return errno;
221 1.1 pooka
222 1.6 pooka /* XXX2: nodewalk is a bit too slow here */
223 1.9 pooka pn_res = puffs_pn_nodewalk(pu, inodecmp, &sb.st_ino);
224 1.1 pooka
225 1.6 pooka if (pn_res == NULL) {
226 1.6 pooka pn_res = puffs_pn_new(pu, NULL);
227 1.6 pooka if (pn_res == NULL)
228 1.6 pooka return ENOMEM;
229 1.6 pooka puffs_stat2vattr(&pn_res->pn_va, &sb);
230 1.6 pooka }
231 1.1 pooka
232 1.21 pooka puffs_newinfo_setcookie(pni, pn_res);
233 1.21 pooka puffs_newinfo_setvtype(pni, pn_res->pn_va.va_type);
234 1.21 pooka puffs_newinfo_setsize(pni, (voff_t)pn_res->pn_va.va_size);
235 1.21 pooka puffs_newinfo_setrdev(pni, pn_res->pn_va.va_rdev);
236 1.1 pooka
237 1.1 pooka return 0;
238 1.1 pooka }
239 1.1 pooka
240 1.1 pooka /*ARGSUSED*/
241 1.1 pooka int
242 1.21 pooka puffs_null_node_create(struct puffs_cc *pcc, void *opc,
243 1.21 pooka struct puffs_newinfo *pni, const struct puffs_cn *pcn,
244 1.21 pooka const struct vattr *va)
245 1.1 pooka {
246 1.1 pooka struct puffs_usermount *pu = puffs_cc_getusermount(pcc);
247 1.1 pooka int fd, rv;
248 1.1 pooka
249 1.4 pooka fd = open(PCNPATH(pcn), O_RDWR | O_CREAT | O_TRUNC);
250 1.1 pooka if (fd == -1)
251 1.1 pooka return errno;
252 1.1 pooka close(fd);
253 1.1 pooka
254 1.21 pooka rv = makenode(pu, pni, pcn, va, 1);
255 1.19 pooka if (rv)
256 1.4 pooka unlink(PCNPATH(pcn));
257 1.19 pooka return rv;
258 1.1 pooka }
259 1.1 pooka
260 1.1 pooka /*ARGSUSED*/
261 1.1 pooka int
262 1.21 pooka puffs_null_node_mknod(struct puffs_cc *pcc, void *opc,
263 1.21 pooka struct puffs_newinfo *pni, const struct puffs_cn *pcn,
264 1.21 pooka const struct vattr *va)
265 1.1 pooka {
266 1.1 pooka struct puffs_usermount *pu = puffs_cc_getusermount(pcc);
267 1.11 pooka mode_t mode;
268 1.1 pooka int rv;
269 1.1 pooka
270 1.11 pooka mode = puffs_addvtype2mode(va->va_mode, va->va_type);
271 1.11 pooka if (mknod(PCNPATH(pcn), mode, va->va_rdev) == -1)
272 1.1 pooka return errno;
273 1.1 pooka
274 1.21 pooka rv = makenode(pu, pni, pcn, va, 0);
275 1.19 pooka if (rv)
276 1.4 pooka unlink(PCNPATH(pcn));
277 1.19 pooka return rv;
278 1.1 pooka }
279 1.1 pooka
280 1.1 pooka /*ARGSUSED*/
281 1.1 pooka int
282 1.1 pooka puffs_null_node_getattr(struct puffs_cc *pcc, void *opc, struct vattr *va,
283 1.20 pooka const struct puffs_cred *pcred, const struct puffs_cid *pcid)
284 1.1 pooka {
285 1.1 pooka struct puffs_node *pn = opc;
286 1.1 pooka struct stat sb;
287 1.1 pooka
288 1.4 pooka if (lstat(PNPATH(pn), &sb) == -1)
289 1.1 pooka return errno;
290 1.1 pooka puffs_stat2vattr(va, &sb);
291 1.1 pooka
292 1.1 pooka return 0;
293 1.1 pooka }
294 1.1 pooka
295 1.1 pooka /*ARGSUSED*/
296 1.1 pooka int
297 1.1 pooka puffs_null_node_setattr(struct puffs_cc *pcc, void *opc,
298 1.20 pooka const struct vattr *va, const struct puffs_cred *pcred,
299 1.20 pooka const struct puffs_cid *pcid)
300 1.1 pooka {
301 1.1 pooka struct puffs_node *pn = opc;
302 1.1 pooka int rv;
303 1.1 pooka
304 1.4 pooka rv = processvattr(PNPATH(pn), va, pn->pn_va.va_type == VREG);
305 1.1 pooka if (rv)
306 1.1 pooka return rv;
307 1.1 pooka
308 1.1 pooka puffs_setvattr(&pn->pn_va, va);
309 1.1 pooka
310 1.1 pooka return 0;
311 1.1 pooka }
312 1.1 pooka
313 1.1 pooka /*ARGSUSED*/
314 1.1 pooka int
315 1.3 pooka puffs_null_node_fsync(struct puffs_cc *pcc, void *opc,
316 1.3 pooka const struct puffs_cred *pcred, int how,
317 1.20 pooka off_t offlo, off_t offhi, const struct puffs_cid *pcid)
318 1.3 pooka {
319 1.3 pooka struct puffs_node *pn = opc;
320 1.3 pooka int fd, rv;
321 1.3 pooka int fflags;
322 1.3 pooka
323 1.3 pooka rv = 0;
324 1.4 pooka fd = writeableopen(PNPATH(pn));
325 1.3 pooka if (fd == -1)
326 1.3 pooka return errno;
327 1.3 pooka
328 1.3 pooka if (how & PUFFS_FSYNC_DATAONLY)
329 1.3 pooka fflags = FDATASYNC;
330 1.3 pooka else
331 1.3 pooka fflags = FFILESYNC;
332 1.3 pooka if (how & PUFFS_FSYNC_CACHE)
333 1.3 pooka fflags |= FDISKSYNC;
334 1.3 pooka
335 1.3 pooka if (fsync_range(fd, fflags, offlo, offhi - offlo) == -1)
336 1.3 pooka rv = errno;
337 1.3 pooka
338 1.3 pooka close(fd);
339 1.3 pooka
340 1.3 pooka return rv;
341 1.3 pooka }
342 1.3 pooka
343 1.3 pooka /*ARGSUSED*/
344 1.3 pooka int
345 1.1 pooka puffs_null_node_remove(struct puffs_cc *pcc, void *opc, void *targ,
346 1.1 pooka const struct puffs_cn *pcn)
347 1.1 pooka {
348 1.1 pooka struct puffs_node *pn_targ = targ;
349 1.1 pooka
350 1.4 pooka if (unlink(PNPATH(pn_targ)) == -1)
351 1.1 pooka return errno;
352 1.16 pooka puffs_pn_remove(pn_targ);
353 1.1 pooka
354 1.1 pooka return 0;
355 1.1 pooka }
356 1.1 pooka
357 1.1 pooka /*ARGSUSED*/
358 1.1 pooka int
359 1.1 pooka puffs_null_node_link(struct puffs_cc *pcc, void *opc, void *targ,
360 1.1 pooka const struct puffs_cn *pcn)
361 1.1 pooka {
362 1.1 pooka struct puffs_node *pn_targ = targ;
363 1.1 pooka
364 1.4 pooka if (link(PNPATH(pn_targ), PCNPATH(pcn)) == -1)
365 1.1 pooka return errno;
366 1.1 pooka
367 1.1 pooka return 0;
368 1.1 pooka }
369 1.1 pooka
370 1.1 pooka /*ARGSUSED*/
371 1.1 pooka int
372 1.1 pooka puffs_null_node_rename(struct puffs_cc *pcc, void *opc, void *src,
373 1.1 pooka const struct puffs_cn *pcn_src, void *targ_dir, void *targ,
374 1.1 pooka const struct puffs_cn *pcn_targ)
375 1.1 pooka {
376 1.1 pooka
377 1.4 pooka if (rename(PCNPATH(pcn_src), PCNPATH(pcn_targ)) == -1)
378 1.1 pooka return errno;
379 1.1 pooka
380 1.1 pooka return 0;
381 1.1 pooka }
382 1.1 pooka
383 1.1 pooka /*ARGSUSED*/
384 1.1 pooka int
385 1.21 pooka puffs_null_node_mkdir(struct puffs_cc *pcc, void *opc,
386 1.21 pooka struct puffs_newinfo *pni, const struct puffs_cn *pcn,
387 1.21 pooka const struct vattr *va)
388 1.1 pooka {
389 1.1 pooka struct puffs_usermount *pu = puffs_cc_getusermount(pcc);
390 1.1 pooka int rv;
391 1.1 pooka
392 1.4 pooka if (mkdir(PCNPATH(pcn), va->va_mode) == -1)
393 1.1 pooka return errno;
394 1.1 pooka
395 1.21 pooka rv = makenode(pu, pni, pcn, va, 0);
396 1.19 pooka if (rv)
397 1.5 agc rmdir(PCNPATH(pcn));
398 1.19 pooka return rv;
399 1.1 pooka }
400 1.1 pooka
401 1.1 pooka /*ARGSUSED*/
402 1.1 pooka int
403 1.1 pooka puffs_null_node_rmdir(struct puffs_cc *pcc, void *opc, void *targ,
404 1.1 pooka const struct puffs_cn *pcn)
405 1.1 pooka {
406 1.1 pooka struct puffs_node *pn_targ = targ;
407 1.1 pooka
408 1.4 pooka if (rmdir(PNPATH(pn_targ)) == -1)
409 1.1 pooka return errno;
410 1.16 pooka puffs_pn_remove(pn_targ);
411 1.1 pooka
412 1.1 pooka return 0;
413 1.1 pooka }
414 1.1 pooka
415 1.1 pooka /*ARGSUSED*/
416 1.1 pooka int
417 1.21 pooka puffs_null_node_symlink(struct puffs_cc *pcc, void *opc,
418 1.21 pooka struct puffs_newinfo *pni, const struct puffs_cn *pcn,
419 1.21 pooka const struct vattr *va, const char *linkname)
420 1.1 pooka {
421 1.1 pooka struct puffs_usermount *pu = puffs_cc_getusermount(pcc);
422 1.1 pooka int rv;
423 1.1 pooka
424 1.4 pooka if (symlink(linkname, PCNPATH(pcn)) == -1)
425 1.1 pooka return errno;
426 1.1 pooka
427 1.21 pooka rv = makenode(pu, pni, pcn, va, 0);
428 1.19 pooka if (rv)
429 1.4 pooka unlink(PCNPATH(pcn));
430 1.19 pooka return rv;
431 1.1 pooka }
432 1.1 pooka
433 1.1 pooka /*ARGSUSED*/
434 1.1 pooka int
435 1.1 pooka puffs_null_node_readlink(struct puffs_cc *pcc, void *opc,
436 1.1 pooka const struct puffs_cred *pcred, char *linkname, size_t *linklen)
437 1.1 pooka {
438 1.1 pooka struct puffs_node *pn = opc;
439 1.1 pooka ssize_t rv;
440 1.1 pooka
441 1.4 pooka rv = readlink(PNPATH(pn), linkname, *linklen);
442 1.1 pooka if (rv == -1)
443 1.1 pooka return errno;
444 1.1 pooka
445 1.8 pooka *linklen = rv;
446 1.1 pooka return 0;
447 1.1 pooka }
448 1.1 pooka
449 1.1 pooka /*ARGSUSED*/
450 1.1 pooka int
451 1.1 pooka puffs_null_node_readdir(struct puffs_cc *pcc, void *opc, struct dirent *de,
452 1.12 pooka off_t *off, size_t *reslen, const struct puffs_cred *pcred,
453 1.12 pooka int *eofflag, off_t *cookies, size_t *ncookies)
454 1.1 pooka {
455 1.1 pooka struct puffs_node *pn = opc;
456 1.1 pooka struct dirent entry, *result;
457 1.1 pooka DIR *dp;
458 1.1 pooka off_t i;
459 1.1 pooka int rv;
460 1.1 pooka
461 1.4 pooka dp = opendir(PNPATH(pn));
462 1.1 pooka if (dp == NULL)
463 1.1 pooka return errno;
464 1.1 pooka
465 1.1 pooka rv = 0;
466 1.1 pooka i = *off;
467 1.1 pooka
468 1.1 pooka /*
469 1.1 pooka * XXX: need to do trickery here, telldir/seekdir would be nice, but
470 1.1 pooka * then we'd need to keep state, which I'm too lazy to keep
471 1.1 pooka */
472 1.1 pooka while (i--) {
473 1.1 pooka rv = readdir_r(dp, &entry, &result);
474 1.1 pooka if (rv || !result)
475 1.1 pooka goto out;
476 1.1 pooka }
477 1.1 pooka
478 1.1 pooka for (;;) {
479 1.1 pooka rv = readdir_r(dp, &entry, &result);
480 1.1 pooka if (rv != 0)
481 1.1 pooka goto out;
482 1.1 pooka
483 1.1 pooka if (!result)
484 1.1 pooka goto out;
485 1.1 pooka
486 1.1 pooka if (_DIRENT_SIZE(result) > *reslen)
487 1.1 pooka goto out;
488 1.1 pooka
489 1.1 pooka *de = *result;
490 1.1 pooka *reslen -= _DIRENT_SIZE(result);
491 1.1 pooka de = _DIRENT_NEXT(de);
492 1.1 pooka
493 1.1 pooka (*off)++;
494 1.1 pooka }
495 1.1 pooka
496 1.1 pooka out:
497 1.1 pooka closedir(dp);
498 1.1 pooka return 0;
499 1.1 pooka }
500 1.1 pooka
501 1.1 pooka /*ARGSUSED*/
502 1.1 pooka int
503 1.1 pooka puffs_null_node_read(struct puffs_cc *pcc, void *opc, uint8_t *buf,
504 1.1 pooka off_t offset, size_t *buflen, const struct puffs_cred *pcred,
505 1.1 pooka int ioflag)
506 1.1 pooka {
507 1.1 pooka struct puffs_node *pn = opc;
508 1.1 pooka ssize_t n;
509 1.1 pooka off_t off;
510 1.1 pooka int fd, rv;
511 1.1 pooka
512 1.1 pooka rv = 0;
513 1.4 pooka fd = open(PNPATH(pn), O_RDONLY);
514 1.1 pooka if (fd == -1)
515 1.1 pooka return errno;
516 1.1 pooka off = lseek(fd, offset, SEEK_SET);
517 1.1 pooka if (off == -1) {
518 1.1 pooka rv = errno;
519 1.1 pooka goto out;
520 1.1 pooka }
521 1.1 pooka
522 1.1 pooka n = read(fd, buf, *buflen);
523 1.1 pooka if (n == -1)
524 1.1 pooka rv = errno;
525 1.1 pooka else
526 1.1 pooka *buflen -= n;
527 1.1 pooka
528 1.1 pooka out:
529 1.1 pooka close(fd);
530 1.1 pooka return rv;
531 1.1 pooka }
532 1.1 pooka
533 1.1 pooka /*ARGSUSED*/
534 1.1 pooka int
535 1.1 pooka puffs_null_node_write(struct puffs_cc *pcc, void *opc, uint8_t *buf,
536 1.1 pooka off_t offset, size_t *buflen, const struct puffs_cred *pcred,
537 1.1 pooka int ioflag)
538 1.1 pooka {
539 1.1 pooka struct puffs_node *pn = opc;
540 1.1 pooka ssize_t n;
541 1.1 pooka off_t off;
542 1.1 pooka int fd, rv;
543 1.1 pooka
544 1.1 pooka rv = 0;
545 1.4 pooka fd = writeableopen(PNPATH(pn));
546 1.3 pooka if (fd == -1)
547 1.3 pooka return errno;
548 1.2 pooka
549 1.1 pooka off = lseek(fd, offset, SEEK_SET);
550 1.1 pooka if (off == -1) {
551 1.1 pooka rv = errno;
552 1.1 pooka goto out;
553 1.1 pooka }
554 1.1 pooka
555 1.1 pooka n = write(fd, buf, *buflen);
556 1.1 pooka if (n == -1)
557 1.1 pooka rv = errno;
558 1.1 pooka else
559 1.1 pooka *buflen -= n;
560 1.1 pooka
561 1.1 pooka out:
562 1.1 pooka close(fd);
563 1.1 pooka return rv;
564 1.1 pooka }
565