null.c revision 1.16 1 1.16 pooka /* $NetBSD: null.c,v 1.16 2007/06/24 17:55:07 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 1.16 pooka __RCSID("$NetBSD: null.c,v 1.16 2007/06/24 17:55:07 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 1.9 pooka /*ARGSUSED*/
137 1.1 pooka int
138 1.1 pooka puffs_null_fs_statvfs(struct puffs_cc *pcc, struct statvfs *svfsb, pid_t pid)
139 1.1 pooka {
140 1.1 pooka struct puffs_usermount *pu = puffs_cc_getusermount(pcc);
141 1.1 pooka
142 1.13 pooka if (statvfs(PNPATH(puffs_getroot(pu)), svfsb) == -1)
143 1.1 pooka return errno;
144 1.1 pooka
145 1.1 pooka return 0;
146 1.1 pooka }
147 1.1 pooka
148 1.1 pooka int
149 1.1 pooka puffs_null_node_lookup(struct puffs_cc *pcc, void *opc, void **newnode,
150 1.1 pooka enum vtype *newtype, voff_t *newsize, dev_t *newrdev,
151 1.1 pooka const struct puffs_cn *pcn)
152 1.1 pooka {
153 1.1 pooka struct puffs_usermount *pu = puffs_cc_getusermount(pcc);
154 1.1 pooka struct puffs_node *pn = opc, *pn_res;
155 1.1 pooka struct stat sb;
156 1.1 pooka int rv;
157 1.1 pooka
158 1.1 pooka assert(pn->pn_va.va_type == VDIR);
159 1.1 pooka
160 1.6 pooka /*
161 1.6 pooka * Note to whoever is copypasting this: you must first check
162 1.6 pooka * if the node is there and only then do nodewalk. Alternatively
163 1.6 pooka * you could make sure that you don't return unlinked/rmdir'd
164 1.6 pooka * nodes in some other fashion
165 1.6 pooka */
166 1.6 pooka rv = lstat(PCNPATH(pcn), &sb);
167 1.1 pooka if (rv)
168 1.10 pooka return errno;
169 1.1 pooka
170 1.6 pooka /* XXX2: nodewalk is a bit too slow here */
171 1.9 pooka pn_res = puffs_pn_nodewalk(pu, inodecmp, &sb.st_ino);
172 1.1 pooka
173 1.6 pooka if (pn_res == NULL) {
174 1.6 pooka pn_res = puffs_pn_new(pu, NULL);
175 1.6 pooka if (pn_res == NULL)
176 1.6 pooka return ENOMEM;
177 1.6 pooka puffs_stat2vattr(&pn_res->pn_va, &sb);
178 1.6 pooka }
179 1.1 pooka
180 1.1 pooka *newnode = pn_res;
181 1.1 pooka *newtype = pn_res->pn_va.va_type;
182 1.1 pooka *newsize = pn_res->pn_va.va_size;
183 1.1 pooka *newrdev = pn_res->pn_va.va_rdev;
184 1.1 pooka
185 1.1 pooka return 0;
186 1.1 pooka }
187 1.1 pooka
188 1.1 pooka /*ARGSUSED*/
189 1.1 pooka int
190 1.1 pooka puffs_null_node_create(struct puffs_cc *pcc, void *opc, void **newnode,
191 1.1 pooka const struct puffs_cn *pcn, const struct vattr *va)
192 1.1 pooka {
193 1.1 pooka struct puffs_usermount *pu = puffs_cc_getusermount(pcc);
194 1.1 pooka struct puffs_node *pn;
195 1.1 pooka int fd, rv;
196 1.1 pooka
197 1.4 pooka fd = open(PCNPATH(pcn), O_RDWR | O_CREAT | O_TRUNC);
198 1.1 pooka if (fd == -1)
199 1.1 pooka return errno;
200 1.1 pooka close(fd);
201 1.4 pooka if ((rv = processvattr(PCNPATH(pcn), va, 1)) != 0) {
202 1.4 pooka unlink(PCNPATH(pcn));
203 1.1 pooka return rv;
204 1.1 pooka }
205 1.1 pooka
206 1.1 pooka pn = puffs_pn_new(pu, NULL);
207 1.1 pooka if (!pn) {
208 1.4 pooka unlink(PCNPATH(pcn));
209 1.1 pooka return ENOMEM;
210 1.1 pooka }
211 1.1 pooka puffs_setvattr(&pn->pn_va, va);
212 1.1 pooka
213 1.1 pooka *newnode = pn;
214 1.1 pooka return 0;
215 1.1 pooka }
216 1.1 pooka
217 1.1 pooka /*ARGSUSED*/
218 1.1 pooka int
219 1.1 pooka puffs_null_node_mknod(struct puffs_cc *pcc, void *opc, void **newnode,
220 1.1 pooka const struct puffs_cn *pcn, const struct vattr *va)
221 1.1 pooka {
222 1.1 pooka struct puffs_usermount *pu = puffs_cc_getusermount(pcc);
223 1.1 pooka struct puffs_node *pn;
224 1.11 pooka mode_t mode;
225 1.1 pooka int rv;
226 1.1 pooka
227 1.11 pooka mode = puffs_addvtype2mode(va->va_mode, va->va_type);
228 1.11 pooka if (mknod(PCNPATH(pcn), mode, va->va_rdev) == -1)
229 1.1 pooka return errno;
230 1.1 pooka
231 1.4 pooka if ((rv = processvattr(PCNPATH(pcn), va, 0)) != 0) {
232 1.4 pooka unlink(PCNPATH(pcn));
233 1.1 pooka return rv;
234 1.1 pooka }
235 1.1 pooka
236 1.1 pooka pn = puffs_pn_new(pu, NULL);
237 1.1 pooka if (!pn) {
238 1.4 pooka unlink(PCNPATH(pcn));
239 1.1 pooka return ENOMEM;
240 1.1 pooka }
241 1.1 pooka puffs_setvattr(&pn->pn_va, va);
242 1.1 pooka
243 1.1 pooka *newnode = pn;
244 1.1 pooka return 0;
245 1.1 pooka }
246 1.1 pooka
247 1.1 pooka /*ARGSUSED*/
248 1.1 pooka int
249 1.1 pooka puffs_null_node_getattr(struct puffs_cc *pcc, void *opc, struct vattr *va,
250 1.1 pooka const struct puffs_cred *pcred, pid_t pid)
251 1.1 pooka {
252 1.1 pooka struct puffs_node *pn = opc;
253 1.1 pooka struct stat sb;
254 1.1 pooka
255 1.4 pooka if (lstat(PNPATH(pn), &sb) == -1)
256 1.1 pooka return errno;
257 1.1 pooka puffs_stat2vattr(va, &sb);
258 1.1 pooka
259 1.1 pooka return 0;
260 1.1 pooka }
261 1.1 pooka
262 1.1 pooka /*ARGSUSED*/
263 1.1 pooka int
264 1.1 pooka puffs_null_node_setattr(struct puffs_cc *pcc, void *opc,
265 1.1 pooka const struct vattr *va, const struct puffs_cred *pcred, pid_t pid)
266 1.1 pooka {
267 1.1 pooka struct puffs_node *pn = opc;
268 1.1 pooka int rv;
269 1.1 pooka
270 1.4 pooka rv = processvattr(PNPATH(pn), va, pn->pn_va.va_type == VREG);
271 1.1 pooka if (rv)
272 1.1 pooka return rv;
273 1.1 pooka
274 1.1 pooka puffs_setvattr(&pn->pn_va, va);
275 1.1 pooka
276 1.1 pooka return 0;
277 1.1 pooka }
278 1.1 pooka
279 1.1 pooka /*ARGSUSED*/
280 1.1 pooka int
281 1.3 pooka puffs_null_node_fsync(struct puffs_cc *pcc, void *opc,
282 1.3 pooka const struct puffs_cred *pcred, int how,
283 1.3 pooka off_t offlo, off_t offhi, pid_t pid)
284 1.3 pooka {
285 1.3 pooka struct puffs_node *pn = opc;
286 1.3 pooka int fd, rv;
287 1.3 pooka int fflags;
288 1.3 pooka
289 1.3 pooka rv = 0;
290 1.4 pooka fd = writeableopen(PNPATH(pn));
291 1.3 pooka if (fd == -1)
292 1.3 pooka return errno;
293 1.3 pooka
294 1.3 pooka if (how & PUFFS_FSYNC_DATAONLY)
295 1.3 pooka fflags = FDATASYNC;
296 1.3 pooka else
297 1.3 pooka fflags = FFILESYNC;
298 1.3 pooka if (how & PUFFS_FSYNC_CACHE)
299 1.3 pooka fflags |= FDISKSYNC;
300 1.3 pooka
301 1.3 pooka if (fsync_range(fd, fflags, offlo, offhi - offlo) == -1)
302 1.3 pooka rv = errno;
303 1.3 pooka
304 1.3 pooka close(fd);
305 1.3 pooka
306 1.3 pooka return rv;
307 1.3 pooka }
308 1.3 pooka
309 1.3 pooka /*ARGSUSED*/
310 1.3 pooka int
311 1.1 pooka puffs_null_node_remove(struct puffs_cc *pcc, void *opc, void *targ,
312 1.1 pooka const struct puffs_cn *pcn)
313 1.1 pooka {
314 1.1 pooka struct puffs_node *pn_targ = targ;
315 1.1 pooka
316 1.4 pooka if (unlink(PNPATH(pn_targ)) == -1)
317 1.1 pooka return errno;
318 1.16 pooka puffs_pn_remove(pn_targ);
319 1.1 pooka
320 1.1 pooka return 0;
321 1.1 pooka }
322 1.1 pooka
323 1.1 pooka /*ARGSUSED*/
324 1.1 pooka int
325 1.1 pooka puffs_null_node_link(struct puffs_cc *pcc, void *opc, void *targ,
326 1.1 pooka const struct puffs_cn *pcn)
327 1.1 pooka {
328 1.1 pooka struct puffs_node *pn_targ = targ;
329 1.1 pooka
330 1.4 pooka if (link(PNPATH(pn_targ), PCNPATH(pcn)) == -1)
331 1.1 pooka return errno;
332 1.1 pooka
333 1.1 pooka return 0;
334 1.1 pooka }
335 1.1 pooka
336 1.1 pooka /*ARGSUSED*/
337 1.1 pooka int
338 1.1 pooka puffs_null_node_rename(struct puffs_cc *pcc, void *opc, void *src,
339 1.1 pooka const struct puffs_cn *pcn_src, void *targ_dir, void *targ,
340 1.1 pooka const struct puffs_cn *pcn_targ)
341 1.1 pooka {
342 1.1 pooka
343 1.4 pooka if (rename(PCNPATH(pcn_src), PCNPATH(pcn_targ)) == -1)
344 1.1 pooka return errno;
345 1.1 pooka
346 1.1 pooka return 0;
347 1.1 pooka }
348 1.1 pooka
349 1.1 pooka /*ARGSUSED*/
350 1.1 pooka int
351 1.1 pooka puffs_null_node_mkdir(struct puffs_cc *pcc, void *opc, void **newnode,
352 1.1 pooka const struct puffs_cn *pcn, const struct vattr *va)
353 1.1 pooka {
354 1.1 pooka struct puffs_usermount *pu = puffs_cc_getusermount(pcc);
355 1.1 pooka struct puffs_node *pn;
356 1.1 pooka int rv;
357 1.1 pooka
358 1.4 pooka if (mkdir(PCNPATH(pcn), va->va_mode) == -1)
359 1.1 pooka return errno;
360 1.1 pooka
361 1.4 pooka if ((rv = processvattr(PCNPATH(pcn), va, 0)) != 0) {
362 1.5 agc rmdir(PCNPATH(pcn));
363 1.1 pooka return rv;
364 1.1 pooka }
365 1.1 pooka
366 1.1 pooka pn = puffs_pn_new(pu, NULL);
367 1.1 pooka if (pn == NULL) {
368 1.4 pooka rmdir(PCNPATH(pcn));
369 1.1 pooka return ENOMEM;
370 1.1 pooka }
371 1.1 pooka puffs_setvattr(&pn->pn_va, va);
372 1.1 pooka
373 1.1 pooka *newnode = pn;
374 1.1 pooka return 0;
375 1.1 pooka }
376 1.1 pooka
377 1.1 pooka /*ARGSUSED*/
378 1.1 pooka int
379 1.1 pooka puffs_null_node_rmdir(struct puffs_cc *pcc, void *opc, void *targ,
380 1.1 pooka const struct puffs_cn *pcn)
381 1.1 pooka {
382 1.1 pooka struct puffs_node *pn_targ = targ;
383 1.1 pooka
384 1.4 pooka if (rmdir(PNPATH(pn_targ)) == -1)
385 1.1 pooka return errno;
386 1.16 pooka puffs_pn_remove(pn_targ);
387 1.1 pooka
388 1.1 pooka return 0;
389 1.1 pooka }
390 1.1 pooka
391 1.1 pooka /*ARGSUSED*/
392 1.1 pooka int
393 1.1 pooka puffs_null_node_symlink(struct puffs_cc *pcc, void *opc, void **newnode,
394 1.1 pooka const struct puffs_cn *pcn, const struct vattr *va,
395 1.1 pooka const char *linkname)
396 1.1 pooka {
397 1.1 pooka struct puffs_usermount *pu = puffs_cc_getusermount(pcc);
398 1.1 pooka struct puffs_node *pn;
399 1.1 pooka int rv;
400 1.1 pooka
401 1.4 pooka if (symlink(linkname, PCNPATH(pcn)) == -1)
402 1.1 pooka return errno;
403 1.1 pooka
404 1.4 pooka if ((rv = processvattr(PCNPATH(pcn), va, 0)) != 0) {
405 1.4 pooka unlink(PCNPATH(pcn));
406 1.1 pooka return rv;
407 1.1 pooka }
408 1.1 pooka
409 1.1 pooka pn = puffs_pn_new(pu, NULL);
410 1.1 pooka if (pn == NULL) {
411 1.4 pooka rmdir(PCNPATH(pcn));
412 1.1 pooka return ENOMEM;
413 1.1 pooka }
414 1.1 pooka puffs_setvattr(&pn->pn_va, va);
415 1.1 pooka
416 1.1 pooka *newnode = pn;
417 1.1 pooka return 0;
418 1.1 pooka }
419 1.1 pooka
420 1.1 pooka /*ARGSUSED*/
421 1.1 pooka int
422 1.1 pooka puffs_null_node_readlink(struct puffs_cc *pcc, void *opc,
423 1.1 pooka const struct puffs_cred *pcred, char *linkname, size_t *linklen)
424 1.1 pooka {
425 1.1 pooka struct puffs_node *pn = opc;
426 1.1 pooka ssize_t rv;
427 1.1 pooka
428 1.4 pooka rv = readlink(PNPATH(pn), linkname, *linklen);
429 1.1 pooka if (rv == -1)
430 1.1 pooka return errno;
431 1.1 pooka
432 1.8 pooka *linklen = rv;
433 1.1 pooka return 0;
434 1.1 pooka }
435 1.1 pooka
436 1.1 pooka /*ARGSUSED*/
437 1.1 pooka int
438 1.1 pooka puffs_null_node_readdir(struct puffs_cc *pcc, void *opc, struct dirent *de,
439 1.12 pooka off_t *off, size_t *reslen, const struct puffs_cred *pcred,
440 1.12 pooka int *eofflag, off_t *cookies, size_t *ncookies)
441 1.1 pooka {
442 1.1 pooka struct puffs_node *pn = opc;
443 1.1 pooka struct dirent entry, *result;
444 1.1 pooka DIR *dp;
445 1.1 pooka off_t i;
446 1.1 pooka int rv;
447 1.1 pooka
448 1.4 pooka dp = opendir(PNPATH(pn));
449 1.1 pooka if (dp == NULL)
450 1.1 pooka return errno;
451 1.1 pooka
452 1.1 pooka rv = 0;
453 1.1 pooka i = *off;
454 1.1 pooka
455 1.1 pooka /*
456 1.1 pooka * XXX: need to do trickery here, telldir/seekdir would be nice, but
457 1.1 pooka * then we'd need to keep state, which I'm too lazy to keep
458 1.1 pooka */
459 1.1 pooka while (i--) {
460 1.1 pooka rv = readdir_r(dp, &entry, &result);
461 1.1 pooka if (rv || !result)
462 1.1 pooka goto out;
463 1.1 pooka }
464 1.1 pooka
465 1.1 pooka for (;;) {
466 1.1 pooka rv = readdir_r(dp, &entry, &result);
467 1.1 pooka if (rv != 0)
468 1.1 pooka goto out;
469 1.1 pooka
470 1.1 pooka if (!result)
471 1.1 pooka goto out;
472 1.1 pooka
473 1.1 pooka if (_DIRENT_SIZE(result) > *reslen)
474 1.1 pooka goto out;
475 1.1 pooka
476 1.1 pooka *de = *result;
477 1.1 pooka *reslen -= _DIRENT_SIZE(result);
478 1.1 pooka de = _DIRENT_NEXT(de);
479 1.1 pooka
480 1.1 pooka (*off)++;
481 1.1 pooka }
482 1.1 pooka
483 1.1 pooka out:
484 1.1 pooka closedir(dp);
485 1.1 pooka return 0;
486 1.1 pooka }
487 1.1 pooka
488 1.1 pooka /*ARGSUSED*/
489 1.1 pooka int
490 1.1 pooka puffs_null_node_read(struct puffs_cc *pcc, void *opc, uint8_t *buf,
491 1.1 pooka off_t offset, size_t *buflen, const struct puffs_cred *pcred,
492 1.1 pooka int ioflag)
493 1.1 pooka {
494 1.1 pooka struct puffs_node *pn = opc;
495 1.1 pooka ssize_t n;
496 1.1 pooka off_t off;
497 1.1 pooka int fd, rv;
498 1.1 pooka
499 1.1 pooka rv = 0;
500 1.4 pooka fd = open(PNPATH(pn), O_RDONLY);
501 1.1 pooka if (fd == -1)
502 1.1 pooka return errno;
503 1.1 pooka off = lseek(fd, offset, SEEK_SET);
504 1.1 pooka if (off == -1) {
505 1.1 pooka rv = errno;
506 1.1 pooka goto out;
507 1.1 pooka }
508 1.1 pooka
509 1.1 pooka n = read(fd, buf, *buflen);
510 1.1 pooka if (n == -1)
511 1.1 pooka rv = errno;
512 1.1 pooka else
513 1.1 pooka *buflen -= n;
514 1.1 pooka
515 1.1 pooka out:
516 1.1 pooka close(fd);
517 1.1 pooka return rv;
518 1.1 pooka }
519 1.1 pooka
520 1.1 pooka /*ARGSUSED*/
521 1.1 pooka int
522 1.1 pooka puffs_null_node_write(struct puffs_cc *pcc, void *opc, uint8_t *buf,
523 1.1 pooka off_t offset, size_t *buflen, const struct puffs_cred *pcred,
524 1.1 pooka int ioflag)
525 1.1 pooka {
526 1.1 pooka struct puffs_node *pn = opc;
527 1.1 pooka ssize_t n;
528 1.1 pooka off_t off;
529 1.1 pooka int fd, rv;
530 1.1 pooka
531 1.1 pooka rv = 0;
532 1.4 pooka fd = writeableopen(PNPATH(pn));
533 1.3 pooka if (fd == -1)
534 1.3 pooka return errno;
535 1.2 pooka
536 1.1 pooka off = lseek(fd, offset, SEEK_SET);
537 1.1 pooka if (off == -1) {
538 1.1 pooka rv = errno;
539 1.1 pooka goto out;
540 1.1 pooka }
541 1.1 pooka
542 1.1 pooka n = write(fd, buf, *buflen);
543 1.1 pooka if (n == -1)
544 1.1 pooka rv = errno;
545 1.1 pooka else
546 1.1 pooka *buflen -= n;
547 1.1 pooka
548 1.1 pooka out:
549 1.1 pooka close(fd);
550 1.1 pooka return rv;
551 1.1 pooka }
552 1.6 pooka
553 1.6 pooka /*ARGSUSED*/
554 1.6 pooka int
555 1.6 pooka puffs_null_node_reclaim(struct puffs_cc *pcc, void *opc, pid_t pid)
556 1.6 pooka {
557 1.6 pooka
558 1.6 pooka return puffs_genfs_node_reclaim(pcc, opc, pid);
559 1.6 pooka }
560