1 /*
2 * Copyright (c) 2000-2019 Apple Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28 /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
29 /*
30 * Copyright (c) 1992, 1993
31 * The Regents of the University of California. All rights reserved.
32 *
33 * This code is derived from software donated to Berkeley by
34 * Jan-Simon Pendry.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
38 * are met:
39 * 1. Redistributions of source code must retain the above copyright
40 * notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 * notice, this list of conditions and the following disclaimer in the
43 * documentation and/or other materials provided with the distribution.
44 * 3. All advertising materials mentioning features or use of this software
45 * must display the following acknowledgement:
46 * This product includes software developed by the University of
47 * California, Berkeley and its contributors.
48 * 4. Neither the name of the University nor the names of its contributors
49 * may be used to endorse or promote products derived from this software
50 * without specific prior written permission.
51 *
52 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
53 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
54 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
55 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
56 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
57 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
58 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
59 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
60 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
61 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
62 * SUCH DAMAGE.
63 *
64 * @(#)fdesc_vnops.c 8.17 (Berkeley) 5/22/95
65 *
66 */
67
68 /*
69 * /dev/fd Filesystem
70 */
71
72 #include <sys/param.h>
73 #include <sys/systm.h>
74 #include <sys/types.h>
75 #include <sys/time.h>
76 #include <sys/proc_internal.h>
77 #include <sys/kernel.h> /* boottime */
78 #include <sys/resourcevar.h>
79 #include <sys/filedesc.h>
80 #include <sys/kauth.h>
81 #include <sys/vnode_internal.h>
82 #include <sys/malloc.h>
83 #include <sys/file_internal.h>
84 #include <sys/stat.h>
85 #include <sys/mount_internal.h>
86 #include <sys/namei.h>
87 #include <sys/dirent.h>
88 #include <sys/ubc.h>
89 #include <sys/socketvar.h>
90 #include <sys/pipe.h>
91 #include <sys/uio_internal.h>
92 #include <vfs/vfs_support.h>
93 #include <pexpert/pexpert.h>
94 #include <miscfs/devfs/fdesc.h>
95 #include <miscfs/devfs/devfs.h>
96 #include <miscfs/devfs/devfsdefs.h>
97
98 #define FDL_WANT 0x01
99 #define FDL_LOCKED 0x02
100 static int fdcache_lock;
101
102
103 #if (FD_STDIN != FD_STDOUT - 1) || (FD_STDOUT != FD_STDERR - 1)
104 FD_STDIN, FD_STDOUT, FD_STDERR must be a sequence n, n + 1, n + 2
105 #endif
106
107 #define NFDCACHE 3
108
109 #define FD_NHASH(ix) \
110 (&fdhashtbl[(ix) & fdhash])
111 LIST_HEAD(fdhashhead, fdescnode) * fdhashtbl;
112 u_long fdhash;
113
114 static int fdesc_attr(int fd, struct vnode_attr *vap, vfs_context_t a_context);
115
116 static LCK_GRP_DECLARE(fdesc_lckgrp, "fdesc");
117 static LCK_MTX_DECLARE(fdesc_mtx, &fdesc_lckgrp);
118
119 static void
fdesc_lock(void)120 fdesc_lock(void)
121 {
122 lck_mtx_lock(&fdesc_mtx);
123 }
124
125 static void
fdesc_unlock(void)126 fdesc_unlock(void)
127 {
128 lck_mtx_unlock(&fdesc_mtx);
129 }
130
131
132 /*
133 * Initialise cache headers, create the devfs node
134 */
135 int
devfs_fdesc_init()136 devfs_fdesc_init()
137 {
138 int error = 0;
139 devnode_t *rootdir = dev_root->de_dnp;
140 devdirent_t *direntp;
141
142 /* XXX Make sure you have the right path... */
143 fdhashtbl = hashinit(NFDCACHE, M_CACHE, &fdhash);
144
145 DEVFS_LOCK();
146 dev_add_entry("fd", rootdir, DEV_DEVFD, NULL, NULL, NULL, &direntp);
147 devfs_fdesc_makelinks();
148 DEVFS_UNLOCK();
149
150 return error;
151 }
152
153 /*
154 * Called during early startup, no need to synchronize
155 */
156 int
devfs_fdesc_makelinks()157 devfs_fdesc_makelinks()
158 {
159 int error = 0;
160 devdirent_t *stdin_ent = NULL, *stdout_ent = NULL, *stderr_ent = NULL;
161 devnode_t *root_devnode = dev_root->de_dnp;
162
163 /* We do this ugliness to get around some "const" warnings */
164 char in[] = "stdin";
165 char out[] = "stdout";
166 char err[] = "stderr";
167 char zero[] = "fd/0";
168 char one[] = "fd/1";
169 char two[] = "fd/2";
170
171 if ((error = devfs_make_symlink(root_devnode, in, 0555, zero, &stdin_ent))) {
172 printf("Couldn't make stdin, err %d.\n", error);
173 goto bad;
174 }
175
176 if ((error = devfs_make_symlink(root_devnode, out, 0555, one, &stdout_ent))) {
177 printf("Couldn't make stdout, err %d.\n", error);
178 goto bad;
179 }
180
181 if ((error = devfs_make_symlink(root_devnode, err, 0555, two, &stderr_ent))) {
182 printf("Couldn't make stderr, err %d.\n", error);
183 goto bad;
184 }
185
186 return 0;
187
188 bad:
189 if (stdin_ent) {
190 dev_free_name(stdin_ent);
191 }
192 if (stdout_ent) {
193 dev_free_name(stdout_ent);
194 }
195 if (stderr_ent) {
196 dev_free_name(stderr_ent);
197 }
198
199 return error;
200 }
201
202 int
fdesc_allocvp(fdntype ftype,int ix,struct mount * mp,struct vnode ** vpp,enum vtype vtype,int fdno)203 fdesc_allocvp(fdntype ftype, int ix, struct mount *mp, struct vnode **vpp, enum vtype vtype, int fdno)
204 {
205 struct fdhashhead *fc;
206 struct fdescnode *fd;
207 int error = 0;
208 int vid = 0;
209 struct vnode_fsparam vfsp;
210 struct vnode *vp;
211
212 fdesc_lock();
213
214 fc = FD_NHASH(ix);
215 loop:
216 for (fd = fc->lh_first; fd != 0; fd = fd->fd_hash.le_next) {
217 if (fd->fd_ix == ix && vnode_mount(fd->fd_vnode) == mp) {
218 vid = vnode_vid(fd->fd_vnode);
219 vp = fd->fd_vnode;
220 vnode_hold(vp);
221 fdesc_unlock();
222
223 if (vnode_getwithvid(vp, vid)) {
224 vnode_drop(vp);
225 fdesc_lock();
226 goto loop;
227 }
228
229 vnode_drop(vp);
230 *vpp = vp;
231 (*vpp)->v_type = (uint16_t)vtype;
232
233 return error;
234 }
235 }
236
237 /* Only one thread can add to the hash at a time */
238 if (fdcache_lock & FDL_LOCKED) {
239 fdcache_lock |= FDL_WANT;
240 msleep((caddr_t) &fdcache_lock, &fdesc_mtx, PINOD, "fdesc_allocvp", NULL);
241 goto loop;
242 }
243
244 fdcache_lock |= FDL_LOCKED;
245 fdesc_unlock();
246
247 fd = kalloc_type(struct fdescnode, Z_WAITOK);
248
249 vfsp.vnfs_mp = mp;
250 vfsp.vnfs_vtype = vtype;
251 vfsp.vnfs_str = "fdesc";
252 vfsp.vnfs_dvp = NULL;
253 vfsp.vnfs_fsnode = fd;
254 vfsp.vnfs_cnp = NULL;
255 vfsp.vnfs_vops = fdesc_vnodeop_p;
256 vfsp.vnfs_rdev = 0;
257 vfsp.vnfs_filesize = 0;
258 vfsp.vnfs_flags = VNFS_NOCACHE | VNFS_CANTCACHE;
259 vfsp.vnfs_marksystem = 0;
260 vfsp.vnfs_markroot = 0;
261
262 error = vnode_create_ext(VNCREATE_FLAVOR, VCREATESIZE, &vfsp, vpp,
263 VNODE_CREATE_DEFAULT);
264 if (error) {
265 kfree_type(struct fdescnode, fd);
266 fdesc_lock();
267 goto out;
268 }
269
270 (*vpp)->v_tag = VT_FDESC;
271 fd->fd_vnode = *vpp;
272 fd->fd_type = ftype;
273 fd->fd_fd = fdno;
274 fd->fd_link = NULL;
275 fd->fd_ix = ix;
276
277 fdesc_lock();
278
279 LIST_INSERT_HEAD(fc, fd, fd_hash);
280 out:
281 /* Hold the lock when we get here */
282 fdcache_lock &= ~FDL_LOCKED;
283
284 if (fdcache_lock & FDL_WANT) {
285 fdcache_lock &= ~FDL_WANT;
286 wakeup((caddr_t) &fdcache_lock);
287 }
288
289 fdesc_unlock();
290
291 return error;
292 }
293
294 /*
295 * vp is the current namei directory
296 * ndp is the name to locate in that directory...
297 *
298 * This vnop should only be called on the special directory /dev/fd.
299 */
300 int
devfs_devfd_lookup(struct vnop_lookup_args * ap)301 devfs_devfd_lookup(struct vnop_lookup_args *ap)
302 {
303 struct vnode **vpp = ap->a_vpp;
304 struct vnode *dvp = ap->a_dvp;
305 struct componentname *cnp = ap->a_cnp;
306 char *pname = cnp->cn_nameptr;
307 struct proc *p = vfs_context_proc(ap->a_context);
308 int numfiles = p->p_fd.fd_nfiles;
309 int fd;
310 int error;
311 struct vnode *fvp;
312
313 if (cnp->cn_namelen == 1 && *pname == '.') {
314 *vpp = dvp;
315
316 if ((error = vnode_get(dvp))) {
317 goto bad;
318 }
319 return 0;
320 }
321
322 fd = 0;
323 while (*pname >= '0' && *pname <= '9') {
324 if (os_mul_and_add_overflow(fd, 10, *pname++ - '0', &fd)) {
325 break;
326 }
327 }
328
329 if (*pname != '\0') {
330 error = ENOENT;
331 goto bad;
332 }
333
334 if (fd < 0 || fd >= numfiles ||
335 *fdfile(p, fd) == NULL ||
336 (*fdflags(p, fd) & UF_RESERVED)) {
337 error = EBADF;
338 goto bad;
339 }
340
341 error = fdesc_allocvp(Fdesc, FD_DESC + fd, dvp->v_mount, &fvp, VNON, fd);
342 if (error) {
343 goto bad;
344 }
345 *vpp = fvp;
346 return 0;
347
348 bad:
349 *vpp = NULL;
350 return error;
351 }
352
353 int
fdesc_open(struct vnop_open_args * ap)354 fdesc_open(struct vnop_open_args *ap)
355 {
356 struct vnode *vp = ap->a_vp;
357 thread_t thr = vfs_context_thread(ap->a_context);
358 uthread_t uu;
359 int error = 0;
360
361 if (thr == NULL) {
362 return EINVAL;
363 }
364
365 uu = get_bsdthread_info(thr);
366
367 switch (VTOFDESC(vp)->fd_type) {
368 case Fdesc:
369 /*
370 * XXX Kludge: set uu->uu_dupfd to contain the value of the
371 * the file descriptor being sought for duplication. The error
372 * return ensures that the vnode for this device will be
373 * released by vn_open. Open will detect this special error and
374 * take the actions in dupfdopen. Other callers of vn_open or
375 * vnop_open will simply report the error.
376 */
377 uu->uu_dupfd = VTOFDESC(vp)->fd_fd; /* XXX */
378 error = ENODEV;
379 break;
380 default:
381 panic("Invalid type for fdesc node!");
382 break;
383 }
384
385 return error;
386 }
387
388 static int
fdesc_attr(int fd,struct vnode_attr * vap,vfs_context_t a_context)389 fdesc_attr(int fd, struct vnode_attr *vap, vfs_context_t a_context)
390 {
391 struct fileproc *fp;
392 struct proc *p = vfs_context_proc(a_context);
393 struct stat stb;
394 int error;
395
396 if ((error = fp_lookup(p, fd, &fp, 0))) {
397 return error;
398 }
399 switch (FILEGLOB_DTYPE(fp->fp_glob)) {
400 case DTYPE_VNODE:
401 if ((error = vnode_getwithref((struct vnode *)fp_get_data(fp))) != 0) {
402 break;
403 }
404 if ((error = vnode_authorize((struct vnode *)fp_get_data(fp),
405 NULL,
406 KAUTH_VNODE_READ_ATTRIBUTES | KAUTH_VNODE_READ_SECURITY,
407 a_context)) == 0) {
408 error = vnode_getattr((struct vnode *)fp_get_data(fp), vap, a_context);
409 }
410 if (error == 0 && vap->va_type == VDIR) {
411 /*
412 * directories can cause loops in the namespace,
413 * so turn off the 'x' bits to avoid trouble.
414 *
415 * XXX ACLs break this, of course
416 */
417 vap->va_mode &= ~((VEXEC) | (VEXEC >> 3) | (VEXEC >> 6));
418 }
419 (void)vnode_put((struct vnode *)fp_get_data(fp));
420 break;
421
422 case DTYPE_SOCKET:
423 case DTYPE_PIPE:
424 #if SOCKETS
425 if (FILEGLOB_DTYPE(fp->fp_glob) == DTYPE_SOCKET) {
426 error = soo_stat((struct socket *)fp_get_data(fp), (void *)&stb, 0);
427 } else
428 #endif /* SOCKETS */
429 error = pipe_stat((struct pipe *)fp_get_data(fp), (void *)&stb, 0);
430
431 if (error == 0) {
432 if (FILEGLOB_DTYPE(fp->fp_glob) == DTYPE_SOCKET) {
433 VATTR_RETURN(vap, va_type, VSOCK);
434 } else {
435 VATTR_RETURN(vap, va_type, VFIFO);
436 }
437
438 VATTR_RETURN(vap, va_mode, stb.st_mode);
439 VATTR_RETURN(vap, va_nlink, stb.st_nlink);
440 VATTR_RETURN(vap, va_uid, stb.st_uid);
441 VATTR_RETURN(vap, va_gid, stb.st_gid);
442 VATTR_RETURN(vap, va_fsid, stb.st_dev);
443 VATTR_RETURN(vap, va_fileid, stb.st_ino);
444 VATTR_RETURN(vap, va_data_size, stb.st_size);
445 VATTR_RETURN(vap, va_access_time, stb.st_atimespec);
446 VATTR_RETURN(vap, va_modify_time, stb.st_mtimespec);
447 VATTR_RETURN(vap, va_change_time, stb.st_ctimespec);
448 VATTR_RETURN(vap, va_gen, stb.st_gen);
449 VATTR_RETURN(vap, va_flags, stb.st_flags);
450 VATTR_RETURN(vap, va_rdev, stb.st_rdev);
451 VATTR_RETURN(vap, va_total_alloc, stb.st_blocks * stb.st_blksize);
452 VATTR_RETURN(vap, va_acl, NULL);
453 }
454 break;
455
456 default:
457 error = EBADF;
458 }
459
460 fp_drop(p, fd, fp, 0);
461 return error;
462 }
463
464 int
fdesc_getattr(struct vnop_getattr_args * ap)465 fdesc_getattr(struct vnop_getattr_args *ap)
466 {
467 struct vnode *vp = ap->a_vp;
468 struct vnode_attr *vap = ap->a_vap;
469 unsigned fd;
470 int error = 0;
471
472 switch (VTOFDESC(vp)->fd_type) {
473 case Fdesc:
474 fd = VTOFDESC(vp)->fd_fd;
475 error = fdesc_attr(fd, vap, ap->a_context);
476 break;
477
478 default:
479 panic("Invalid type for an fdesc node!");
480 break;
481 }
482
483 /*
484 * Yes, we do this without locking, but this value is always just
485 * a snapshot.
486 */
487 if (error == 0) {
488 vp->v_type = (uint16_t)vap->va_type;
489
490 /* We need an inactive to reset type to VNON */
491 vnode_setneedinactive(vp);
492 }
493
494 return error;
495 }
496
497 int
fdesc_setattr(struct vnop_setattr_args * ap)498 fdesc_setattr(struct vnop_setattr_args *ap)
499 {
500 struct fileproc *fp;
501 unsigned fd;
502 kauth_action_t action;
503 vnode_t vp;
504 int error;
505 struct proc * p = vfs_context_proc(ap->a_context);
506
507 /*
508 * Can't mess with the root vnode
509 */
510 switch (VTOFDESC(ap->a_vp)->fd_type) {
511 case Fdesc:
512 break;
513 default:
514 panic("Invalid type for an fdesc node!");
515 return EACCES;
516 }
517
518 fd = VTOFDESC(ap->a_vp)->fd_fd;
519 if ((error = fp_lookup(vfs_context_proc(ap->a_context), fd, &fp, 0))) {
520 return error;
521 }
522
523 /*
524 * Can setattr the underlying vnode, but not sockets!
525 */
526 switch (FILEGLOB_DTYPE(fp->fp_glob)) {
527 case DTYPE_VNODE:
528 {
529 vp = (struct vnode *)fp_get_data(fp);
530
531 if ((error = vnode_getwithref(vp)) != 0) {
532 break;
533 }
534
535 if (((error = vnode_authattr(vp, ap->a_vap, &action, ap->a_context)) != 0) ||
536 ((error = vnode_authorize(vp, NULL, action, ap->a_context)) != 0)) {
537 if (error == EACCES) {
538 error = EPERM;
539 }
540
541 (void)vnode_put(vp);
542 break;
543 }
544
545 error = vnode_setattr(vp, ap->a_vap, ap->a_context);
546 (void)vnode_put(vp);
547 break;
548 }
549
550 case DTYPE_SOCKET:
551 case DTYPE_PIPE:
552 error = 0;
553 break;
554
555 default:
556 error = EBADF;
557 break;
558 }
559
560 fp_drop(p, fd, fp, 0);
561 return error;
562 }
563
564 #define UIO_MX 16
565
566 /*
567 * static struct dirtmp {
568 * u_int32_t d_fileno;
569 * u_short d_reclen;
570 * u_short d_namlen;
571 * char d_name[8];
572 * } rootent[] = {
573 * { FD_DEVFD, UIO_MX, 2, "fd" },
574 * { FD_STDIN, UIO_MX, 5, "stdin" },
575 * { FD_STDOUT, UIO_MX, 6, "stdout" },
576 * { FD_STDERR, UIO_MX, 6, "stderr" },
577 * { 0, 0, 0, "" }
578 * };
579 */
580
581 /* Only called on /dev/fd */
582 int
devfs_devfd_readdir(struct vnop_readdir_args * ap)583 devfs_devfd_readdir(struct vnop_readdir_args *ap)
584 {
585 struct uio *uio = ap->a_uio;
586 struct proc *p = current_proc();
587 off_t i;
588 int error;
589
590 /*
591 * We don't allow exporting fdesc mounts, and currently local
592 * requests do not need cookies.
593 */
594 if (ap->a_flags & (VNODE_READDIR_EXTENDED | VNODE_READDIR_REQSEEKOFF)) {
595 return EINVAL;
596 }
597
598 /*
599 * There needs to be space for at least one entry.
600 */
601 if (uio_resid(uio) < UIO_MX) {
602 return EINVAL;
603 }
604
605 i = uio->uio_offset / UIO_MX;
606 error = 0;
607 while (uio_resid(uio) >= UIO_MX) {
608 if (i >= p->p_fd.fd_nfiles || i < 0) {
609 break;
610 }
611
612 if (*fdfile(p, i) != NULL && !(*fdflags(p, i) & UF_RESERVED)) {
613 struct dirent d;
614 struct dirent *dp = &d;
615
616 bzero((caddr_t) dp, UIO_MX);
617
618 dp->d_namlen = (__uint8_t)scnprintf(dp->d_name, sizeof(dp->d_name),
619 "%lld", i);
620 dp->d_reclen = UIO_MX;
621 dp->d_type = DT_UNKNOWN;
622 dp->d_fileno = (ino_t)i + FD_STDIN;
623 /*
624 * And ship to userland
625 */
626 error = uiomove((caddr_t) dp, UIO_MX, uio);
627 if (error) {
628 break;
629 }
630 }
631 i++;
632 }
633
634 uio->uio_offset = i * UIO_MX;
635 return error;
636 }
637
638 int
fdesc_read(__unused struct vnop_read_args * ap)639 fdesc_read(__unused struct vnop_read_args *ap)
640 {
641 return ENOTSUP;
642 }
643
644 int
fdesc_write(__unused struct vnop_write_args * ap)645 fdesc_write(__unused struct vnop_write_args *ap)
646 {
647 return ENOTSUP;
648 }
649
650 int
fdesc_ioctl(__unused struct vnop_ioctl_args * ap)651 fdesc_ioctl(__unused struct vnop_ioctl_args *ap)
652 {
653 return ENOTSUP;
654 }
655
656 int
fdesc_select(__unused struct vnop_select_args * ap)657 fdesc_select(__unused struct vnop_select_args *ap)
658 {
659 return ENOTSUP;
660 }
661
662 int
fdesc_inactive(struct vnop_inactive_args * ap)663 fdesc_inactive(struct vnop_inactive_args *ap)
664 {
665 struct vnode *vp = ap->a_vp;
666
667 /*
668 * Clear out the v_type field to avoid
669 * nasty things happening in vgone().
670 */
671 vp->v_type = VNON;
672
673 return 0;
674 }
675
676 int
fdesc_reclaim(struct vnop_reclaim_args * ap)677 fdesc_reclaim(struct vnop_reclaim_args *ap)
678 {
679 struct vnode *vp = ap->a_vp;
680 struct fdescnode *fd = VTOFDESC(vp);
681
682 fdesc_lock();
683
684 LIST_REMOVE(fd, fd_hash);
685 kfree_type(struct fdescnode, vp->v_data);
686
687 fdesc_unlock();
688
689 return 0;
690 }
691
692 /*
693 * Return POSIX pathconf information applicable to special devices.
694 */
695 int
fdesc_pathconf(struct vnop_pathconf_args * ap)696 fdesc_pathconf(struct vnop_pathconf_args *ap)
697 {
698 switch (ap->a_name) {
699 case _PC_LINK_MAX:
700 *ap->a_retval = LINK_MAX;
701 return 0;
702 case _PC_MAX_CANON:
703 *ap->a_retval = MAX_CANON;
704 return 0;
705 case _PC_MAX_INPUT:
706 *ap->a_retval = MAX_INPUT;
707 return 0;
708 case _PC_PIPE_BUF:
709 *ap->a_retval = PIPE_BUF;
710 return 0;
711 case _PC_CHOWN_RESTRICTED:
712 *ap->a_retval = 200112; /* _POSIX_CHOWN_RESTRICTED */
713 return 0;
714 case _PC_VDISABLE:
715 *ap->a_retval = _POSIX_VDISABLE;
716 return 0;
717 default:
718 return EINVAL;
719 }
720 /* NOTREACHED */
721 }
722
723 /*
724 * /dev/fd "should never get here" operation
725 */
726 int
fdesc_badop(void)727 fdesc_badop(void)
728 {
729 return ENOTSUP;
730 /* NOTREACHED */
731 }
732
733 #define VOPFUNC int (*)(void *)
734
735 #define fdesc_revoke nop_revoke
736 #define fdesc_strategy (void (*)(void))fdesc_badop
737
738 #define fdesc_nullop (void (*)(void ))nullop
739 #define fdesc_error (void (*)(void ))vn_default_error
740 #define fdesc_notsupp (void (*)(void ))eopnotsupp
741
742 int(**fdesc_vnodeop_p)(void *);
743 const struct vnodeopv_entry_desc devfs_fdesc_vnodeop_entries[] = {
744 { .opve_op = &vnop_default_desc, .opve_impl = (VOPFUNC)fdesc_error },
745 { .opve_op = &vnop_lookup_desc, .opve_impl = (VOPFUNC)fdesc_error}, /* lookup */
746 { .opve_op = &vnop_create_desc, .opve_impl = (VOPFUNC)fdesc_notsupp }, /* create */
747 { .opve_op = &vnop_mknod_desc, .opve_impl = (VOPFUNC)fdesc_notsupp }, /* mknod */
748 { .opve_op = &vnop_open_desc, .opve_impl = (VOPFUNC)fdesc_open }, /* open */
749 { .opve_op = &vnop_close_desc, .opve_impl = (VOPFUNC)fdesc_nullop }, /* close */
750 { .opve_op = &vnop_access_desc, .opve_impl = (VOPFUNC)fdesc_nullop }, /* access */
751 { .opve_op = &vnop_getattr_desc, .opve_impl = (VOPFUNC)fdesc_getattr }, /* getattr */
752 { .opve_op = &vnop_setattr_desc, .opve_impl = (VOPFUNC)fdesc_setattr }, /* setattr */
753 { .opve_op = &vnop_read_desc, .opve_impl = (VOPFUNC)fdesc_read }, /* read */
754 { .opve_op = &vnop_write_desc, .opve_impl = (VOPFUNC)fdesc_write }, /* write */
755 { .opve_op = &vnop_ioctl_desc, .opve_impl = (VOPFUNC)fdesc_ioctl }, /* ioctl */
756 { .opve_op = &vnop_select_desc, .opve_impl = (VOPFUNC)fdesc_select }, /* select */
757 { .opve_op = &vnop_revoke_desc, .opve_impl = (VOPFUNC)fdesc_revoke }, /* revoke */
758 { .opve_op = &vnop_mmap_desc, .opve_impl = (VOPFUNC)fdesc_notsupp }, /* mmap */
759 { .opve_op = &vnop_fsync_desc, .opve_impl = (VOPFUNC)fdesc_nullop }, /* fsync */
760 { .opve_op = &vnop_remove_desc, .opve_impl = (VOPFUNC)fdesc_notsupp }, /* remove */
761 { .opve_op = &vnop_link_desc, .opve_impl = (VOPFUNC)fdesc_notsupp }, /* link */
762 { .opve_op = &vnop_rename_desc, .opve_impl = (VOPFUNC)fdesc_notsupp }, /* rename */
763 { .opve_op = &vnop_mkdir_desc, .opve_impl = (VOPFUNC)fdesc_notsupp }, /* mkdir */
764 { .opve_op = &vnop_rmdir_desc, .opve_impl = (VOPFUNC)fdesc_notsupp }, /* rmdir */
765 { .opve_op = &vnop_symlink_desc, .opve_impl = (VOPFUNC)fdesc_notsupp }, /* symlink */
766 { .opve_op = &vnop_readdir_desc, .opve_impl = (VOPFUNC)fdesc_error},/* readdir */
767 { .opve_op = &vnop_readlink_desc, .opve_impl = (VOPFUNC)err_readlink}, /* readlink */
768 { .opve_op = &vnop_inactive_desc, .opve_impl = (VOPFUNC)fdesc_inactive },/* inactive */
769 { .opve_op = &vnop_reclaim_desc, .opve_impl = (VOPFUNC)fdesc_reclaim }, /* reclaim */
770 { .opve_op = &vnop_strategy_desc, .opve_impl = (VOPFUNC)fdesc_strategy }, /* strategy */
771 { .opve_op = &vnop_pathconf_desc, .opve_impl = (VOPFUNC)fdesc_pathconf }, /* pathconf */
772 { .opve_op = &vnop_advlock_desc, .opve_impl = (VOPFUNC)fdesc_notsupp }, /* advlock */
773 { .opve_op = &vnop_bwrite_desc, .opve_impl = (VOPFUNC)fdesc_notsupp }, /* bwrite */
774 { .opve_op = &vnop_pagein_desc, .opve_impl = (VOPFUNC)err_pagein }, /* pagein */
775 { .opve_op = &vnop_pageout_desc, .opve_impl = (VOPFUNC)err_pageout }, /* pageout */
776 { .opve_op = &vnop_copyfile_desc, .opve_impl = (VOPFUNC)err_copyfile }, /* Copyfile */
777 { .opve_op = &vnop_blktooff_desc, .opve_impl = (VOPFUNC)fdesc_notsupp }, /* blktooff */
778 { .opve_op = &vnop_blktooff_desc, .opve_impl = (VOPFUNC)fdesc_notsupp }, /* offtoblk */
779 { .opve_op = &vnop_blockmap_desc, .opve_impl = (VOPFUNC)fdesc_notsupp }, /* blockmap */
780 { .opve_op = (struct vnodeop_desc*)NULL, .opve_impl = (VOPFUNC)NULL }
781 };
782
783 const struct vnodeopv_desc devfs_fdesc_vnodeop_opv_desc =
784 { .opv_desc_vector_p = &fdesc_vnodeop_p, .opv_desc_ops = devfs_fdesc_vnodeop_entries };
785