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 /*
342 * For OP_SETATTR lookups, resolve the backing vnode now so we do
343 * MACF checks on the right thing.
344 *
345 * If there is no vnode (i.e. something else is open at that fd) then
346 * just return an fdescnode.
347 */
348 if ((cnp->cn_ndp->ni_op == OP_SETATTR) &&
349 (0 == vnode_getfromfd(ap->a_context, fd, &fvp))) {
350 cnp->cn_flags &= ~MAKEENTRY;
351 *vpp = fvp;
352 return 0;
353 }
354
355 error = fdesc_allocvp(Fdesc, FD_DESC + fd, dvp->v_mount, &fvp, VNON, fd);
356 if (error) {
357 goto bad;
358 }
359 *vpp = fvp;
360 return 0;
361
362 bad:
363 *vpp = NULL;
364 return error;
365 }
366
367 int
fdesc_open(struct vnop_open_args * ap)368 fdesc_open(struct vnop_open_args *ap)
369 {
370 struct vnode *vp = ap->a_vp;
371 thread_t thr = vfs_context_thread(ap->a_context);
372 uthread_t uu;
373 int error = 0;
374
375 if (thr == NULL) {
376 return EINVAL;
377 }
378
379 uu = get_bsdthread_info(thr);
380
381 switch (VTOFDESC(vp)->fd_type) {
382 case Fdesc:
383 /*
384 * XXX Kludge: set uu->uu_dupfd to contain the value of the
385 * the file descriptor being sought for duplication. The error
386 * return ensures that the vnode for this device will be
387 * released by vn_open. Open will detect this special error and
388 * take the actions in dupfdopen. Other callers of vn_open or
389 * vnop_open will simply report the error.
390 */
391 uu->uu_dupfd = VTOFDESC(vp)->fd_fd; /* XXX */
392 error = ENODEV;
393 break;
394 default:
395 panic("Invalid type for fdesc node!");
396 break;
397 }
398
399 return error;
400 }
401
402 static int
fdesc_attr(int fd,struct vnode_attr * vap,vfs_context_t a_context)403 fdesc_attr(int fd, struct vnode_attr *vap, vfs_context_t a_context)
404 {
405 struct fileproc *fp;
406 struct proc *p = vfs_context_proc(a_context);
407 struct stat stb;
408 int error;
409
410 if ((error = fp_lookup(p, fd, &fp, 0))) {
411 return error;
412 }
413 switch (FILEGLOB_DTYPE(fp->fp_glob)) {
414 case DTYPE_VNODE: {
415 vnode_t vp = (vnode_t)fp_get_data(fp);
416
417 if ((error = vnode_getwithref(vp)) != 0) {
418 break;
419 }
420 if ((error = vnode_authorize(vp,
421 NULL,
422 KAUTH_VNODE_READ_ATTRIBUTES | KAUTH_VNODE_READ_SECURITY,
423 a_context)) == 0) {
424 error = vnode_getattr(vp, vap, a_context);
425 }
426 if (error == 0 && vap->va_type == VDIR) {
427 /*
428 * directories can cause loops in the namespace,
429 * so turn off the 'x' bits to avoid trouble.
430 *
431 * XXX ACLs break this, of course
432 */
433 vap->va_mode &= ~((VEXEC) | (VEXEC >> 3) | (VEXEC >> 6));
434 }
435 (void)vnode_put(vp);
436 break;
437 }
438 case DTYPE_SOCKET:
439 case DTYPE_PIPE:
440 #if SOCKETS
441 if (FILEGLOB_DTYPE(fp->fp_glob) == DTYPE_SOCKET) {
442 error = soo_stat((struct socket *)fp_get_data(fp), (void *)&stb, 0);
443 } else
444 #endif /* SOCKETS */
445 error = pipe_stat((struct pipe *)fp_get_data(fp), (void *)&stb, 0);
446
447 if (error == 0) {
448 if (FILEGLOB_DTYPE(fp->fp_glob) == DTYPE_SOCKET) {
449 VATTR_RETURN(vap, va_type, VSOCK);
450 } else {
451 VATTR_RETURN(vap, va_type, VFIFO);
452 }
453
454 VATTR_RETURN(vap, va_mode, stb.st_mode);
455 VATTR_RETURN(vap, va_nlink, stb.st_nlink);
456 VATTR_RETURN(vap, va_uid, stb.st_uid);
457 VATTR_RETURN(vap, va_gid, stb.st_gid);
458 VATTR_RETURN(vap, va_fsid, stb.st_dev);
459 VATTR_RETURN(vap, va_fileid, stb.st_ino);
460 VATTR_RETURN(vap, va_data_size, stb.st_size);
461 VATTR_RETURN(vap, va_access_time, stb.st_atimespec);
462 VATTR_RETURN(vap, va_modify_time, stb.st_mtimespec);
463 VATTR_RETURN(vap, va_change_time, stb.st_ctimespec);
464 VATTR_RETURN(vap, va_gen, stb.st_gen);
465 VATTR_RETURN(vap, va_flags, stb.st_flags);
466 VATTR_RETURN(vap, va_rdev, stb.st_rdev);
467 VATTR_RETURN(vap, va_total_alloc, stb.st_blocks * stb.st_blksize);
468 VATTR_RETURN(vap, va_acl, NULL);
469 }
470 break;
471
472 default:
473 error = EBADF;
474 }
475
476 /* Update 'va_mode' to take into account the bits on the fd. */
477 if (error == 0 && VATTR_IS_SUPPORTED(vap, va_mode)) {
478 int flags;
479
480 flags = fp->fp_glob->fg_flag;
481 if (!(flags & FREAD)) {
482 vap->va_mode &= ~(S_IRUSR | S_IRGRP | S_IROTH);
483 }
484 if (!(flags & FWRITE)) {
485 vap->va_mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
486 }
487 if (!(flags & O_EXEC)) {
488 vap->va_mode &= ~(S_IXUSR | S_IXGRP | S_IXOTH);
489 }
490 }
491
492 fp_drop(p, fd, fp, 0);
493 return error;
494 }
495
496 int
fdesc_getattr(struct vnop_getattr_args * ap)497 fdesc_getattr(struct vnop_getattr_args *ap)
498 {
499 struct vnode *vp = ap->a_vp;
500 struct vnode_attr *vap = ap->a_vap;
501 unsigned fd;
502 int error = 0;
503
504 switch (VTOFDESC(vp)->fd_type) {
505 case Fdesc:
506 fd = VTOFDESC(vp)->fd_fd;
507 error = fdesc_attr(fd, vap, ap->a_context);
508 break;
509
510 default:
511 panic("Invalid type for an fdesc node!");
512 break;
513 }
514
515 /*
516 * Yes, we do this without locking, but this value is always just
517 * a snapshot.
518 */
519 if (error == 0) {
520 vp->v_type = (uint16_t)vap->va_type;
521
522 /* We need an inactive to reset type to VNON */
523 vnode_setneedinactive(vp);
524 }
525
526 return error;
527 }
528
529 int
fdesc_setattr(struct vnop_setattr_args * ap)530 fdesc_setattr(struct vnop_setattr_args *ap)
531 {
532 struct fileproc *fp;
533 unsigned fd;
534 int error;
535 struct proc * p = vfs_context_proc(ap->a_context);
536
537 /*
538 * Can't mess with the root vnode
539 */
540 switch (VTOFDESC(ap->a_vp)->fd_type) {
541 case Fdesc:
542 break;
543 default:
544 panic("Invalid type for an fdesc node!");
545 return EACCES;
546 }
547
548 fd = VTOFDESC(ap->a_vp)->fd_fd;
549 if ((error = fp_lookup(vfs_context_proc(ap->a_context), fd, &fp, 0))) {
550 return error;
551 }
552
553 switch (FILEGLOB_DTYPE(fp->fp_glob)) {
554 case DTYPE_VNODE:
555 /*
556 * We shouldn't get here unless we were raced with close/open.
557 * In that case, shenanigans are happening and it's unsafe to
558 * take action on the `setattr`; the MACF and UNIX permission
559 * checks are no longer valid (TOCTOU).
560 *
561 * Fall through to report success.
562 */
563 case DTYPE_SOCKET:
564 case DTYPE_PIPE:
565 error = 0;
566 break;
567
568 default:
569 error = EBADF;
570 break;
571 }
572
573 fp_drop(p, fd, fp, 0);
574 return error;
575 }
576
577 #define UIO_MX 16
578
579 /*
580 * static struct dirtmp {
581 * u_int32_t d_fileno;
582 * u_short d_reclen;
583 * u_short d_namlen;
584 * char d_name[8];
585 * } rootent[] = {
586 * { FD_DEVFD, UIO_MX, 2, "fd" },
587 * { FD_STDIN, UIO_MX, 5, "stdin" },
588 * { FD_STDOUT, UIO_MX, 6, "stdout" },
589 * { FD_STDERR, UIO_MX, 6, "stderr" },
590 * { 0, 0, 0, "" }
591 * };
592 */
593
594 /* Only called on /dev/fd */
595 int
devfs_devfd_readdir(struct vnop_readdir_args * ap)596 devfs_devfd_readdir(struct vnop_readdir_args *ap)
597 {
598 struct uio *uio = ap->a_uio;
599 struct proc *p = current_proc();
600 off_t i;
601 int error;
602
603 /*
604 * We don't allow exporting fdesc mounts, and currently local
605 * requests do not need cookies.
606 */
607 if (ap->a_flags & (VNODE_READDIR_EXTENDED | VNODE_READDIR_REQSEEKOFF)) {
608 return EINVAL;
609 }
610
611 /*
612 * There needs to be space for at least one entry.
613 */
614 if (uio_resid(uio) < UIO_MX) {
615 return EINVAL;
616 }
617
618 i = uio->uio_offset / UIO_MX;
619 error = 0;
620 while (uio_resid(uio) >= UIO_MX) {
621 if (i >= p->p_fd.fd_nfiles || i < 0) {
622 break;
623 }
624
625 if (*fdfile(p, i) != NULL && !(*fdflags(p, i) & UF_RESERVED)) {
626 struct dirent d;
627 struct dirent *dp = &d;
628
629 bzero((caddr_t) dp, UIO_MX);
630
631 dp->d_namlen = (__uint8_t)scnprintf(dp->d_name, sizeof(dp->d_name),
632 "%lld", i);
633 dp->d_reclen = UIO_MX;
634 dp->d_type = DT_UNKNOWN;
635 dp->d_fileno = (ino_t)i + FD_STDIN;
636 /*
637 * And ship to userland
638 */
639 error = uiomove((caddr_t) dp, UIO_MX, uio);
640 if (error) {
641 break;
642 }
643 }
644 i++;
645 }
646
647 uio->uio_offset = i * UIO_MX;
648 return error;
649 }
650
651 int
fdesc_read(__unused struct vnop_read_args * ap)652 fdesc_read(__unused struct vnop_read_args *ap)
653 {
654 return ENOTSUP;
655 }
656
657 int
fdesc_write(__unused struct vnop_write_args * ap)658 fdesc_write(__unused struct vnop_write_args *ap)
659 {
660 return ENOTSUP;
661 }
662
663 int
fdesc_ioctl(__unused struct vnop_ioctl_args * ap)664 fdesc_ioctl(__unused struct vnop_ioctl_args *ap)
665 {
666 return ENOTSUP;
667 }
668
669 int
fdesc_select(__unused struct vnop_select_args * ap)670 fdesc_select(__unused struct vnop_select_args *ap)
671 {
672 return ENOTSUP;
673 }
674
675 int
fdesc_inactive(struct vnop_inactive_args * ap)676 fdesc_inactive(struct vnop_inactive_args *ap)
677 {
678 struct vnode *vp = ap->a_vp;
679
680 /*
681 * Clear out the v_type field to avoid
682 * nasty things happening in vgone().
683 */
684 vp->v_type = VNON;
685
686 return 0;
687 }
688
689 int
fdesc_reclaim(struct vnop_reclaim_args * ap)690 fdesc_reclaim(struct vnop_reclaim_args *ap)
691 {
692 struct vnode *vp = ap->a_vp;
693 struct fdescnode *fd = VTOFDESC(vp);
694
695 fdesc_lock();
696
697 LIST_REMOVE(fd, fd_hash);
698 kfree_type(struct fdescnode, vp->v_data);
699
700 fdesc_unlock();
701
702 return 0;
703 }
704
705 /*
706 * Return POSIX pathconf information applicable to special devices.
707 */
708 int
fdesc_pathconf(struct vnop_pathconf_args * ap)709 fdesc_pathconf(struct vnop_pathconf_args *ap)
710 {
711 switch (ap->a_name) {
712 case _PC_LINK_MAX:
713 *ap->a_retval = LINK_MAX;
714 return 0;
715 case _PC_MAX_CANON:
716 *ap->a_retval = MAX_CANON;
717 return 0;
718 case _PC_MAX_INPUT:
719 *ap->a_retval = MAX_INPUT;
720 return 0;
721 case _PC_PIPE_BUF:
722 *ap->a_retval = PIPE_BUF;
723 return 0;
724 case _PC_CHOWN_RESTRICTED:
725 *ap->a_retval = 200112; /* _POSIX_CHOWN_RESTRICTED */
726 return 0;
727 case _PC_VDISABLE:
728 *ap->a_retval = _POSIX_VDISABLE;
729 return 0;
730 default:
731 return EINVAL;
732 }
733 /* NOTREACHED */
734 }
735
736 /*
737 * /dev/fd "should never get here" operation
738 */
739 int
fdesc_badop(void)740 fdesc_badop(void)
741 {
742 return ENOTSUP;
743 /* NOTREACHED */
744 }
745
746 #define VOPFUNC int (*)(void *)
747
748 #define fdesc_revoke nop_revoke
749 #define fdesc_strategy (void (*)(void))fdesc_badop
750
751 #define fdesc_nullop (void (*)(void ))nullop
752 #define fdesc_error (void (*)(void ))vn_default_error
753 #define fdesc_notsupp (void (*)(void ))eopnotsupp
754
755 int(**fdesc_vnodeop_p)(void *);
756 const struct vnodeopv_entry_desc devfs_fdesc_vnodeop_entries[] = {
757 { .opve_op = &vnop_default_desc, .opve_impl = (VOPFUNC)fdesc_error },
758 { .opve_op = &vnop_lookup_desc, .opve_impl = (VOPFUNC)fdesc_error}, /* lookup */
759 { .opve_op = &vnop_create_desc, .opve_impl = (VOPFUNC)fdesc_notsupp }, /* create */
760 { .opve_op = &vnop_mknod_desc, .opve_impl = (VOPFUNC)fdesc_notsupp }, /* mknod */
761 { .opve_op = &vnop_open_desc, .opve_impl = (VOPFUNC)fdesc_open }, /* open */
762 { .opve_op = &vnop_close_desc, .opve_impl = (VOPFUNC)fdesc_nullop }, /* close */
763 { .opve_op = &vnop_access_desc, .opve_impl = (VOPFUNC)fdesc_nullop }, /* access */
764 { .opve_op = &vnop_getattr_desc, .opve_impl = (VOPFUNC)fdesc_getattr }, /* getattr */
765 { .opve_op = &vnop_setattr_desc, .opve_impl = (VOPFUNC)fdesc_setattr }, /* setattr */
766 { .opve_op = &vnop_read_desc, .opve_impl = (VOPFUNC)fdesc_read }, /* read */
767 { .opve_op = &vnop_write_desc, .opve_impl = (VOPFUNC)fdesc_write }, /* write */
768 { .opve_op = &vnop_ioctl_desc, .opve_impl = (VOPFUNC)fdesc_ioctl }, /* ioctl */
769 { .opve_op = &vnop_select_desc, .opve_impl = (VOPFUNC)fdesc_select }, /* select */
770 { .opve_op = &vnop_revoke_desc, .opve_impl = (VOPFUNC)fdesc_revoke }, /* revoke */
771 { .opve_op = &vnop_mmap_desc, .opve_impl = (VOPFUNC)fdesc_notsupp }, /* mmap */
772 { .opve_op = &vnop_fsync_desc, .opve_impl = (VOPFUNC)fdesc_nullop }, /* fsync */
773 { .opve_op = &vnop_remove_desc, .opve_impl = (VOPFUNC)fdesc_notsupp }, /* remove */
774 { .opve_op = &vnop_link_desc, .opve_impl = (VOPFUNC)fdesc_notsupp }, /* link */
775 { .opve_op = &vnop_rename_desc, .opve_impl = (VOPFUNC)fdesc_notsupp }, /* rename */
776 { .opve_op = &vnop_mkdir_desc, .opve_impl = (VOPFUNC)fdesc_notsupp }, /* mkdir */
777 { .opve_op = &vnop_rmdir_desc, .opve_impl = (VOPFUNC)fdesc_notsupp }, /* rmdir */
778 { .opve_op = &vnop_symlink_desc, .opve_impl = (VOPFUNC)fdesc_notsupp }, /* symlink */
779 { .opve_op = &vnop_readdir_desc, .opve_impl = (VOPFUNC)fdesc_error},/* readdir */
780 { .opve_op = &vnop_readlink_desc, .opve_impl = (VOPFUNC)err_readlink}, /* readlink */
781 { .opve_op = &vnop_inactive_desc, .opve_impl = (VOPFUNC)fdesc_inactive },/* inactive */
782 { .opve_op = &vnop_reclaim_desc, .opve_impl = (VOPFUNC)fdesc_reclaim }, /* reclaim */
783 { .opve_op = &vnop_strategy_desc, .opve_impl = (VOPFUNC)fdesc_strategy }, /* strategy */
784 { .opve_op = &vnop_pathconf_desc, .opve_impl = (VOPFUNC)fdesc_pathconf }, /* pathconf */
785 { .opve_op = &vnop_advlock_desc, .opve_impl = (VOPFUNC)fdesc_notsupp }, /* advlock */
786 { .opve_op = &vnop_bwrite_desc, .opve_impl = (VOPFUNC)fdesc_notsupp }, /* bwrite */
787 { .opve_op = &vnop_pagein_desc, .opve_impl = (VOPFUNC)err_pagein }, /* pagein */
788 { .opve_op = &vnop_pageout_desc, .opve_impl = (VOPFUNC)err_pageout }, /* pageout */
789 { .opve_op = &vnop_copyfile_desc, .opve_impl = (VOPFUNC)err_copyfile }, /* Copyfile */
790 { .opve_op = &vnop_blktooff_desc, .opve_impl = (VOPFUNC)fdesc_notsupp }, /* blktooff */
791 { .opve_op = &vnop_blktooff_desc, .opve_impl = (VOPFUNC)fdesc_notsupp }, /* offtoblk */
792 { .opve_op = &vnop_blockmap_desc, .opve_impl = (VOPFUNC)fdesc_notsupp }, /* blockmap */
793 { .opve_op = (struct vnodeop_desc*)NULL, .opve_impl = (VOPFUNC)NULL }
794 };
795
796 const struct vnodeopv_desc devfs_fdesc_vnodeop_opv_desc =
797 { .opv_desc_vector_p = &fdesc_vnodeop_p, .opv_desc_ops = devfs_fdesc_vnodeop_entries };
798