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 fd;
309 int error;
310 struct vnode *fvp;
311
312 if (cnp->cn_namelen == 1 && *pname == '.') {
313 *vpp = dvp;
314
315 if ((error = vnode_get(dvp))) {
316 goto bad;
317 }
318 return 0;
319 }
320
321 fd = 0;
322 while (*pname >= '0' && *pname <= '9') {
323 if (os_mul_and_add_overflow(fd, 10, *pname++ - '0', &fd)) {
324 break;
325 }
326 }
327
328 if (*pname != '\0') {
329 error = ENOENT;
330 goto bad;
331 }
332
333 proc_fdlock_spin(p);
334 if (fd < 0 || fd >= p->p_fd.fd_nfiles ||
335 *fdfile(p, fd) == NULL ||
336 (*fdflags(p, fd) & UF_RESERVED)) {
337 proc_fdunlock(p);
338 error = EBADF;
339 goto bad;
340 }
341 proc_fdunlock(p);
342
343 /*
344 * Don't allow mount/unmount operations on fdesc vnodes
345 */
346 if (cnp->cn_ndp->ni_op == OP_MOUNT || cnp->cn_ndp->ni_op == OP_UNMOUNT) {
347 error = ENOTSUP;
348 goto bad;
349 }
350
351 /*
352 * For OP_SETATTR lookups, resolve the backing vnode now so we do
353 * MACF checks on the right thing.
354 *
355 * If there is no vnode (i.e. something else is open at that fd) then
356 * just return an fdescnode.
357 */
358 if ((cnp->cn_ndp->ni_op == OP_SETATTR) &&
359 (0 == vnode_getfromfd(ap->a_context, fd, &fvp))) {
360 cnp->cn_flags &= ~MAKEENTRY;
361 *vpp = fvp;
362 return 0;
363 }
364
365 error = fdesc_allocvp(Fdesc, FD_DESC + fd, dvp->v_mount, &fvp, VNON, fd);
366 if (error) {
367 goto bad;
368 }
369 *vpp = fvp;
370 return 0;
371
372 bad:
373 *vpp = NULL;
374 return error;
375 }
376
377 int
fdesc_open(struct vnop_open_args * ap)378 fdesc_open(struct vnop_open_args *ap)
379 {
380 struct vnode *vp = ap->a_vp;
381 thread_t thr = vfs_context_thread(ap->a_context);
382 uthread_t uu;
383 int error = 0;
384
385 if (thr == NULL) {
386 return EINVAL;
387 }
388
389 uu = get_bsdthread_info(thr);
390
391 switch (VTOFDESC(vp)->fd_type) {
392 case Fdesc:
393 /*
394 * XXX Kludge: set uu->uu_dupfd to contain the value of the
395 * the file descriptor being sought for duplication. The error
396 * return ensures that the vnode for this device will be
397 * released by vn_open. Open will detect this special error and
398 * take the actions in dupfdopen. Other callers of vn_open or
399 * vnop_open will simply report the error.
400 */
401 uu->uu_dupfd = VTOFDESC(vp)->fd_fd; /* XXX */
402 error = ENODEV;
403 break;
404 default:
405 panic("Invalid type for fdesc node!");
406 break;
407 }
408
409 return error;
410 }
411
412 static int
fdesc_attr(int fd,struct vnode_attr * vap,vfs_context_t a_context)413 fdesc_attr(int fd, struct vnode_attr *vap, vfs_context_t a_context)
414 {
415 struct fileproc *fp;
416 struct proc *p = vfs_context_proc(a_context);
417 struct stat stb;
418 int error;
419
420 if ((error = fp_lookup(p, fd, &fp, 0))) {
421 return error;
422 }
423 switch (FILEGLOB_DTYPE(fp->fp_glob)) {
424 case DTYPE_VNODE: {
425 vnode_t vp = (vnode_t)fp_get_data(fp);
426
427 if ((error = vnode_getwithref(vp)) != 0) {
428 break;
429 }
430 if ((error = vnode_authorize(vp,
431 NULL,
432 KAUTH_VNODE_READ_ATTRIBUTES | KAUTH_VNODE_READ_SECURITY,
433 a_context)) == 0) {
434 error = vnode_getattr(vp, vap, a_context);
435 }
436 if (error == 0 && vap->va_type == VDIR) {
437 /*
438 * directories can cause loops in the namespace,
439 * so turn off the 'x' bits to avoid trouble.
440 *
441 * XXX ACLs break this, of course
442 */
443 vap->va_mode &= ~((VEXEC) | (VEXEC >> 3) | (VEXEC >> 6));
444 }
445 (void)vnode_put(vp);
446 break;
447 }
448 case DTYPE_SOCKET:
449 case DTYPE_PIPE:
450 #if SOCKETS
451 if (FILEGLOB_DTYPE(fp->fp_glob) == DTYPE_SOCKET) {
452 error = soo_stat((struct socket *)fp_get_data(fp), (void *)&stb, 0);
453 } else
454 #endif /* SOCKETS */
455 error = pipe_stat((struct pipe *)fp_get_data(fp), (void *)&stb, 0);
456
457 if (error == 0) {
458 if (FILEGLOB_DTYPE(fp->fp_glob) == DTYPE_SOCKET) {
459 VATTR_RETURN(vap, va_type, VSOCK);
460 } else {
461 VATTR_RETURN(vap, va_type, VFIFO);
462 }
463
464 VATTR_RETURN(vap, va_mode, stb.st_mode);
465 VATTR_RETURN(vap, va_nlink, stb.st_nlink);
466 VATTR_RETURN(vap, va_uid, stb.st_uid);
467 VATTR_RETURN(vap, va_gid, stb.st_gid);
468 VATTR_RETURN(vap, va_fsid, stb.st_dev);
469 VATTR_RETURN(vap, va_fileid, stb.st_ino);
470 VATTR_RETURN(vap, va_data_size, stb.st_size);
471 VATTR_RETURN(vap, va_access_time, stb.st_atimespec);
472 VATTR_RETURN(vap, va_modify_time, stb.st_mtimespec);
473 VATTR_RETURN(vap, va_change_time, stb.st_ctimespec);
474 VATTR_RETURN(vap, va_gen, stb.st_gen);
475 VATTR_RETURN(vap, va_flags, stb.st_flags);
476 VATTR_RETURN(vap, va_rdev, stb.st_rdev);
477 VATTR_RETURN(vap, va_total_alloc, stb.st_blocks * stb.st_blksize);
478 VATTR_RETURN(vap, va_acl, NULL);
479 }
480 break;
481
482 default:
483 error = EBADF;
484 }
485
486 /* Update 'va_mode' to take into account the bits on the fd. */
487 if (error == 0 && VATTR_IS_SUPPORTED(vap, va_mode)) {
488 int flags;
489
490 flags = fp->fp_glob->fg_flag;
491 if (!(flags & FREAD)) {
492 vap->va_mode &= ~(S_IRUSR | S_IRGRP | S_IROTH);
493 }
494 if (!(flags & FWRITE)) {
495 vap->va_mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
496 }
497 if (!(flags & O_EXEC)) {
498 vap->va_mode &= ~(S_IXUSR | S_IXGRP | S_IXOTH);
499 }
500 }
501
502 fp_drop(p, fd, fp, 0);
503 return error;
504 }
505
506 int
fdesc_getattr(struct vnop_getattr_args * ap)507 fdesc_getattr(struct vnop_getattr_args *ap)
508 {
509 struct vnode *vp = ap->a_vp;
510 struct vnode_attr *vap = ap->a_vap;
511 unsigned fd;
512 int error = 0;
513
514 switch (VTOFDESC(vp)->fd_type) {
515 case Fdesc:
516 fd = VTOFDESC(vp)->fd_fd;
517 error = fdesc_attr(fd, vap, ap->a_context);
518 break;
519
520 default:
521 panic("Invalid type for an fdesc node!");
522 break;
523 }
524
525 /*
526 * Yes, we do this without locking, but this value is always just
527 * a snapshot.
528 */
529 if (error == 0) {
530 vp->v_type = (uint16_t)vap->va_type;
531
532 /* We need an inactive to reset type to VNON */
533 vnode_setneedinactive(vp);
534 }
535
536 return error;
537 }
538
539 int
fdesc_setattr(struct vnop_setattr_args * ap)540 fdesc_setattr(struct vnop_setattr_args *ap)
541 {
542 struct fileproc *fp;
543 unsigned fd;
544 int error;
545 struct proc * p = vfs_context_proc(ap->a_context);
546
547 /*
548 * Can't mess with the root vnode
549 */
550 switch (VTOFDESC(ap->a_vp)->fd_type) {
551 case Fdesc:
552 break;
553 default:
554 panic("Invalid type for an fdesc node!");
555 return EACCES;
556 }
557
558 fd = VTOFDESC(ap->a_vp)->fd_fd;
559 if ((error = fp_lookup(vfs_context_proc(ap->a_context), fd, &fp, 0))) {
560 return error;
561 }
562
563 switch (FILEGLOB_DTYPE(fp->fp_glob)) {
564 case DTYPE_VNODE:
565 /*
566 * We shouldn't get here unless we were raced with close/open.
567 * In that case, shenanigans are happening and it's unsafe to
568 * take action on the `setattr`; the MACF and UNIX permission
569 * checks are no longer valid (TOCTOU).
570 *
571 * Fall through to report success.
572 */
573 case DTYPE_SOCKET:
574 case DTYPE_PIPE:
575 error = 0;
576 break;
577
578 default:
579 error = EBADF;
580 break;
581 }
582
583 fp_drop(p, fd, fp, 0);
584 return error;
585 }
586
587 #define UIO_MX 16
588
589 /*
590 * static struct dirtmp {
591 * u_int32_t d_fileno;
592 * u_short d_reclen;
593 * u_short d_namlen;
594 * char d_name[8];
595 * } rootent[] = {
596 * { FD_DEVFD, UIO_MX, 2, "fd" },
597 * { FD_STDIN, UIO_MX, 5, "stdin" },
598 * { FD_STDOUT, UIO_MX, 6, "stdout" },
599 * { FD_STDERR, UIO_MX, 6, "stderr" },
600 * { 0, 0, 0, "" }
601 * };
602 */
603
604 /* Only called on /dev/fd */
605 int
devfs_devfd_readdir(struct vnop_readdir_args * ap)606 devfs_devfd_readdir(struct vnop_readdir_args *ap)
607 {
608 struct uio *uio = ap->a_uio;
609 struct proc *p = current_proc();
610 off_t i;
611 int error;
612 bool proc_fd_locked = false;
613
614 /*
615 * We don't allow exporting fdesc mounts, and currently local
616 * requests do not need cookies.
617 */
618 if (ap->a_flags & (VNODE_READDIR_EXTENDED | VNODE_READDIR_REQSEEKOFF)) {
619 return EINVAL;
620 }
621
622 /*
623 * There needs to be space for at least one entry.
624 */
625 if (uio_resid(uio) < UIO_MX) {
626 return EINVAL;
627 }
628
629 i = uio->uio_offset / UIO_MX;
630 error = 0;
631 while (uio_resid(uio) >= UIO_MX) {
632 proc_fdlock(p);
633 if (i >= p->p_fd.fd_nfiles || i < 0) {
634 proc_fdunlock(p);
635 break;
636 }
637 proc_fd_locked = true;
638
639 if (*fdfile(p, i) != NULL && !(*fdflags(p, i) & UF_RESERVED)) {
640 struct dirent d;
641 struct dirent *dp = &d;
642
643 proc_fdunlock(p);
644 proc_fd_locked = false;
645
646 bzero((caddr_t) dp, UIO_MX);
647
648 dp->d_namlen = (__uint8_t)scnprintf(dp->d_name, sizeof(dp->d_name),
649 "%lld", i);
650 dp->d_reclen = UIO_MX;
651 dp->d_type = DT_UNKNOWN;
652 dp->d_fileno = (ino_t)i + FD_STDIN;
653 /*
654 * And ship to userland
655 */
656 error = uiomove((caddr_t) dp, UIO_MX, uio);
657 if (error) {
658 break;
659 }
660 }
661
662 if (proc_fd_locked) {
663 proc_fdunlock(p);
664 proc_fd_locked = false;
665 }
666 i++;
667 }
668
669 uio->uio_offset = i * UIO_MX;
670 return error;
671 }
672
673 int
fdesc_read(__unused struct vnop_read_args * ap)674 fdesc_read(__unused struct vnop_read_args *ap)
675 {
676 return ENOTSUP;
677 }
678
679 int
fdesc_write(__unused struct vnop_write_args * ap)680 fdesc_write(__unused struct vnop_write_args *ap)
681 {
682 return ENOTSUP;
683 }
684
685 int
fdesc_ioctl(__unused struct vnop_ioctl_args * ap)686 fdesc_ioctl(__unused struct vnop_ioctl_args *ap)
687 {
688 return ENOTSUP;
689 }
690
691 int
fdesc_select(__unused struct vnop_select_args * ap)692 fdesc_select(__unused struct vnop_select_args *ap)
693 {
694 return ENOTSUP;
695 }
696
697 int
fdesc_inactive(struct vnop_inactive_args * ap)698 fdesc_inactive(struct vnop_inactive_args *ap)
699 {
700 struct vnode *vp = ap->a_vp;
701
702 /*
703 * Clear out the v_type field to avoid
704 * nasty things happening in vgone().
705 */
706 vp->v_type = VNON;
707
708 return 0;
709 }
710
711 int
fdesc_reclaim(struct vnop_reclaim_args * ap)712 fdesc_reclaim(struct vnop_reclaim_args *ap)
713 {
714 struct vnode *vp = ap->a_vp;
715 struct fdescnode *fd = VTOFDESC(vp);
716
717 fdesc_lock();
718
719 LIST_REMOVE(fd, fd_hash);
720 kfree_type(struct fdescnode, vp->v_data);
721
722 fdesc_unlock();
723
724 return 0;
725 }
726
727 /*
728 * Return POSIX pathconf information applicable to special devices.
729 */
730 int
fdesc_pathconf(struct vnop_pathconf_args * ap)731 fdesc_pathconf(struct vnop_pathconf_args *ap)
732 {
733 switch (ap->a_name) {
734 case _PC_LINK_MAX:
735 *ap->a_retval = LINK_MAX;
736 return 0;
737 case _PC_MAX_CANON:
738 *ap->a_retval = MAX_CANON;
739 return 0;
740 case _PC_MAX_INPUT:
741 *ap->a_retval = MAX_INPUT;
742 return 0;
743 case _PC_PIPE_BUF:
744 *ap->a_retval = PIPE_BUF;
745 return 0;
746 case _PC_CHOWN_RESTRICTED:
747 *ap->a_retval = 200112; /* _POSIX_CHOWN_RESTRICTED */
748 return 0;
749 case _PC_VDISABLE:
750 *ap->a_retval = _POSIX_VDISABLE;
751 return 0;
752 default:
753 return EINVAL;
754 }
755 /* NOTREACHED */
756 }
757
758 /*
759 * /dev/fd "should never get here" operation
760 */
761 int
fdesc_badop(void)762 fdesc_badop(void)
763 {
764 return ENOTSUP;
765 /* NOTREACHED */
766 }
767
768 #define VOPFUNC int (*)(void *)
769
770 #define fdesc_revoke nop_revoke
771 #define fdesc_strategy (void (*)(void))fdesc_badop
772
773 #define fdesc_nullop (void (*)(void ))nullop
774 #define fdesc_error (void (*)(void ))vn_default_error
775 #define fdesc_notsupp (void (*)(void ))eopnotsupp
776
777 int(**fdesc_vnodeop_p)(void *);
778 const struct vnodeopv_entry_desc devfs_fdesc_vnodeop_entries[] = {
779 { .opve_op = &vnop_default_desc, .opve_impl = (VOPFUNC)fdesc_error },
780 { .opve_op = &vnop_lookup_desc, .opve_impl = (VOPFUNC)fdesc_error}, /* lookup */
781 { .opve_op = &vnop_create_desc, .opve_impl = (VOPFUNC)fdesc_notsupp }, /* create */
782 { .opve_op = &vnop_mknod_desc, .opve_impl = (VOPFUNC)fdesc_notsupp }, /* mknod */
783 { .opve_op = &vnop_open_desc, .opve_impl = (VOPFUNC)fdesc_open }, /* open */
784 { .opve_op = &vnop_close_desc, .opve_impl = (VOPFUNC)fdesc_nullop }, /* close */
785 { .opve_op = &vnop_access_desc, .opve_impl = (VOPFUNC)fdesc_nullop }, /* access */
786 { .opve_op = &vnop_getattr_desc, .opve_impl = (VOPFUNC)fdesc_getattr }, /* getattr */
787 { .opve_op = &vnop_setattr_desc, .opve_impl = (VOPFUNC)fdesc_setattr }, /* setattr */
788 { .opve_op = &vnop_read_desc, .opve_impl = (VOPFUNC)fdesc_read }, /* read */
789 { .opve_op = &vnop_write_desc, .opve_impl = (VOPFUNC)fdesc_write }, /* write */
790 { .opve_op = &vnop_ioctl_desc, .opve_impl = (VOPFUNC)fdesc_ioctl }, /* ioctl */
791 { .opve_op = &vnop_select_desc, .opve_impl = (VOPFUNC)fdesc_select }, /* select */
792 { .opve_op = &vnop_revoke_desc, .opve_impl = (VOPFUNC)fdesc_revoke }, /* revoke */
793 { .opve_op = &vnop_mmap_desc, .opve_impl = (VOPFUNC)fdesc_notsupp }, /* mmap */
794 { .opve_op = &vnop_fsync_desc, .opve_impl = (VOPFUNC)fdesc_nullop }, /* fsync */
795 { .opve_op = &vnop_remove_desc, .opve_impl = (VOPFUNC)fdesc_notsupp }, /* remove */
796 { .opve_op = &vnop_link_desc, .opve_impl = (VOPFUNC)fdesc_notsupp }, /* link */
797 { .opve_op = &vnop_rename_desc, .opve_impl = (VOPFUNC)fdesc_notsupp }, /* rename */
798 { .opve_op = &vnop_mkdir_desc, .opve_impl = (VOPFUNC)fdesc_notsupp }, /* mkdir */
799 { .opve_op = &vnop_rmdir_desc, .opve_impl = (VOPFUNC)fdesc_notsupp }, /* rmdir */
800 { .opve_op = &vnop_symlink_desc, .opve_impl = (VOPFUNC)fdesc_notsupp }, /* symlink */
801 { .opve_op = &vnop_readdir_desc, .opve_impl = (VOPFUNC)fdesc_error},/* readdir */
802 { .opve_op = &vnop_readlink_desc, .opve_impl = (VOPFUNC)err_readlink}, /* readlink */
803 { .opve_op = &vnop_inactive_desc, .opve_impl = (VOPFUNC)fdesc_inactive },/* inactive */
804 { .opve_op = &vnop_reclaim_desc, .opve_impl = (VOPFUNC)fdesc_reclaim }, /* reclaim */
805 { .opve_op = &vnop_strategy_desc, .opve_impl = (VOPFUNC)fdesc_strategy }, /* strategy */
806 { .opve_op = &vnop_pathconf_desc, .opve_impl = (VOPFUNC)fdesc_pathconf }, /* pathconf */
807 { .opve_op = &vnop_advlock_desc, .opve_impl = (VOPFUNC)fdesc_notsupp }, /* advlock */
808 { .opve_op = &vnop_bwrite_desc, .opve_impl = (VOPFUNC)fdesc_notsupp }, /* bwrite */
809 { .opve_op = &vnop_pagein_desc, .opve_impl = (VOPFUNC)err_pagein }, /* pagein */
810 { .opve_op = &vnop_pageout_desc, .opve_impl = (VOPFUNC)err_pageout }, /* pageout */
811 { .opve_op = &vnop_copyfile_desc, .opve_impl = (VOPFUNC)err_copyfile }, /* Copyfile */
812 { .opve_op = &vnop_blktooff_desc, .opve_impl = (VOPFUNC)fdesc_notsupp }, /* blktooff */
813 { .opve_op = &vnop_blktooff_desc, .opve_impl = (VOPFUNC)fdesc_notsupp }, /* offtoblk */
814 { .opve_op = &vnop_blockmap_desc, .opve_impl = (VOPFUNC)fdesc_notsupp }, /* blockmap */
815 { .opve_op = (struct vnodeop_desc*)NULL, .opve_impl = (VOPFUNC)NULL }
816 };
817
818 const struct vnodeopv_desc devfs_fdesc_vnodeop_opv_desc =
819 { .opv_desc_vector_p = &fdesc_vnodeop_p, .opv_desc_ops = devfs_fdesc_vnodeop_entries };
820