1 /*-
2 * Copyright (c) 2001 Dag-Erling Coïdan Smørgrav
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer
10 * in this position and unchanged.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
31
32 #include "opt_pseudofs.h"
33
34 #include <sys/param.h>
35 #include <sys/kernel.h>
36 #include <sys/systm.h>
37 #include <sys/ctype.h>
38 #include <sys/dirent.h>
39 #include <sys/fcntl.h>
40 #include <sys/limits.h>
41 #include <sys/lock.h>
42 #include <sys/malloc.h>
43 #include <sys/mount.h>
44 #include <sys/mutex.h>
45 #include <sys/namei.h>
46 #include <sys/proc.h>
47 #include <sys/sbuf.h>
48 #include <sys/sx.h>
49 #include <sys/sysctl.h>
50 #include <sys/vnode.h>
51
52 #include <fs/pseudofs/pseudofs.h>
53 #include <fs/pseudofs/pseudofs_internal.h>
54
55 #define KASSERT_PN_IS_DIR(pn) \
56 KASSERT((pn)->pn_type == pfstype_root || \
57 (pn)->pn_type == pfstype_dir || \
58 (pn)->pn_type == pfstype_procdir, \
59 ("%s(): VDIR vnode refers to non-directory pfs_node", __func__))
60
61 #define KASSERT_PN_IS_FILE(pn) \
62 KASSERT((pn)->pn_type == pfstype_file, \
63 ("%s(): VREG vnode refers to non-file pfs_node", __func__))
64
65 #define KASSERT_PN_IS_LINK(pn) \
66 KASSERT((pn)->pn_type == pfstype_symlink, \
67 ("%s(): VLNK vnode refers to non-link pfs_node", __func__))
68
69 /*
70 * Returns the fileno, adjusted for target pid
71 */
72 static uint32_t
73 pn_fileno(struct pfs_node *pn, pid_t pid)
74 {
75
76 KASSERT(pn->pn_fileno > 0,
77 ("%s(): no fileno allocated", __func__));
78 if (pid != NO_PID)
79 return (pn->pn_fileno * NO_PID + pid);
80 return (pn->pn_fileno);
81 }
82
83 /*
84 * Returns non-zero if given file is visible to given thread.
85 */
86 static int
87 pfs_visible_proc(struct thread *td, struct pfs_node *pn, struct proc *proc)
88 {
89 int visible;
90
91 if (proc == NULL)
92 return (0);
93
94 PROC_LOCK_ASSERT(proc, MA_OWNED);
95
96 visible = ((proc->p_flag & P_WEXIT) == 0);
97 if (visible)
98 visible = (p_cansee(td, proc) == 0);
99 if (visible && pn->pn_vis != NULL)
100 visible = pn_vis(td, proc, pn);
101 if (!visible)
102 return (0);
103 return (1);
104 }
105
106 static int
107 pfs_visible(struct thread *td, struct pfs_node *pn, pid_t pid, struct proc **p)
108 {
109 struct proc *proc;
110
111 PFS_TRACE(("%s (pid: %d, req: %d)",
112 pn->pn_name, pid, td->td_proc->p_pid));
113
114 if (p)
115 *p = NULL;
116 if (pid == NO_PID)
117 PFS_RETURN (1);
118 if ((proc = pfind(pid)) == NULL)
119 PFS_RETURN (0);
120 if (pfs_visible_proc(td, pn, proc)) {
121 if (p)
122 *p = proc;
123 else
124 PROC_UNLOCK(proc);
125 PFS_RETURN (1);
126 }
127 PROC_UNLOCK(proc);
128 PFS_RETURN (0);
129 }
130
131 /*
132 * Verify permissions
133 */
134 static int
135 pfs_access(struct vop_access_args *va)
136 {
137 struct vnode *vn = va->a_vp;
138 struct pfs_vdata *pvd = vn->v_data;
139 struct vattr vattr;
140 int error;
141
142 PFS_TRACE(("%s", pvd->pvd_pn->pn_name));
143 (void)pvd;
144
145 error = VOP_GETATTR(vn, &vattr, va->a_cred, va->a_td);
146 if (error)
147 PFS_RETURN (error);
148 error = vaccess(vn->v_type, vattr.va_mode, vattr.va_uid,
149 vattr.va_gid, va->a_mode, va->a_cred, NULL);
150 PFS_RETURN (error);
151 }
152
153 /*
154 * Close a file or directory
155 */
156 static int
157 pfs_close(struct vop_close_args *va)
158 {
159 struct vnode *vn = va->a_vp;
160 struct pfs_vdata *pvd = vn->v_data;
161 struct pfs_node *pn = pvd->pvd_pn;
162 struct proc *proc;
163 int error;
164
165 PFS_TRACE(("%s", pn->pn_name));
166 pfs_assert_not_owned(pn);
167
168 /*
169 * Do nothing unless this is the last close and the node has a
170 * last-close handler.
171 */
172 if (vrefcnt(vn) > 1 || pn->pn_close == NULL)
173 PFS_RETURN (0);
174
175 if (pvd->pvd_pid != NO_PID) {
176 proc = pfind(pvd->pvd_pid);
177 } else {
178 proc = NULL;
179 }
180
181 error = pn_close(va->a_td, proc, pn);
182
183 if (proc != NULL)
184 PROC_UNLOCK(proc);
185
186 PFS_RETURN (error);
187 }
188
189 /*
190 * Get file attributes
191 */
192 static int
193 pfs_getattr(struct vop_getattr_args *va)
194 {
195 struct vnode *vn = va->a_vp;
196 struct pfs_vdata *pvd = vn->v_data;
197 struct pfs_node *pn = pvd->pvd_pn;
198 struct vattr *vap = va->a_vap;
199 struct proc *proc;
200 int error = 0;
201
202 PFS_TRACE(("%s", pn->pn_name));
203 pfs_assert_not_owned(pn);
204
205 if (!pfs_visible(curthread, pn, pvd->pvd_pid, &proc))
206 PFS_RETURN (ENOENT);
207
208 vap->va_type = vn->v_type;
209 vap->va_fileid = pn_fileno(pn, pvd->pvd_pid);
210 vap->va_flags = 0;
211 vap->va_blocksize = PAGE_SIZE;
212 vap->va_bytes = vap->va_size = 0;
213 vap->va_filerev = 0;
214 vap->va_fsid = vn->v_mount->mnt_stat.f_fsid.val[0];
215 vap->va_nlink = 1;
216 nanotime(&vap->va_ctime);
217 vap->va_atime = vap->va_mtime = vap->va_ctime;
218
219 switch (pn->pn_type) {
220 case pfstype_procdir:
221 case pfstype_root:
222 case pfstype_dir:
223 #if 0
224 pfs_lock(pn);
225 /* compute link count */
226 pfs_unlock(pn);
227 #endif
228 vap->va_mode = 0555;
229 break;
230 case pfstype_file:
231 case pfstype_symlink:
232 vap->va_mode = 0444;
233 break;
234 default:
235 printf("shouldn't be here!\n");
236 vap->va_mode = 0;
237 break;
238 }
239
240 if (proc != NULL) {
241 vap->va_uid = proc->p_ucred->cr_ruid;
242 vap->va_gid = proc->p_ucred->cr_rgid;
243 } else {
244 vap->va_uid = 0;
245 vap->va_gid = 0;
246 }
247
248 if (pn->pn_attr != NULL)
249 error = pn_attr(va->a_td, proc, pn, vap);
250
251 if(proc != NULL)
252 PROC_UNLOCK(proc);
253
254 PFS_RETURN (error);
255 }
256
257 /*
258 * Perform an ioctl
259 */
260 static int
261 pfs_ioctl(struct vop_ioctl_args *va)
262 {
263 struct vnode *vn;
264 struct pfs_vdata *pvd;
265 struct pfs_node *pn;
266 struct proc *proc;
267 int error;
268
269 vn = va->a_vp;
270 vn_lock(vn, LK_SHARED | LK_RETRY, va->a_td);
271 if (vn->v_iflag & VI_DOOMED) {
272 VOP_UNLOCK(vn, 0, va->a_td);
273 return (EBADF);
274 }
275 pvd = vn->v_data;
276 pn = pvd->pvd_pn;
277
278 PFS_TRACE(("%s: %lx", pn->pn_name, va->a_command));
279 pfs_assert_not_owned(pn);
280
281 if (vn->v_type != VREG) {
282 VOP_UNLOCK(vn, 0, va->a_td);
283 PFS_RETURN (EINVAL);
284 }
285 KASSERT_PN_IS_FILE(pn);
286
287 if (pn->pn_ioctl == NULL) {
288 VOP_UNLOCK(vn, 0, va->a_td);
289 PFS_RETURN (ENOTTY);
290 }
291
292 /*
293 * This is necessary because process' privileges may
294 * have changed since the open() call.
295 */
296 if (!pfs_visible(curthread, pn, pvd->pvd_pid, &proc)) {
297 VOP_UNLOCK(vn, 0, va->a_td);
298 PFS_RETURN (EIO);
299 }
300
301 error = pn_ioctl(curthread, proc, pn, va->a_command, va->a_data);
302
303 if (proc != NULL)
304 PROC_UNLOCK(proc);
305
306 VOP_UNLOCK(vn, 0, va->a_td);
307 PFS_RETURN (error);
308 }
309
310 /*
311 * Perform getextattr
312 */
313 static int
314 pfs_getextattr(struct vop_getextattr_args *va)
315 {
316 struct vnode *vn = va->a_vp;
317 struct pfs_vdata *pvd = vn->v_data;
318 struct pfs_node *pn = pvd->pvd_pn;
319 struct proc *proc;
320 int error;
321
322 PFS_TRACE(("%s", pn->pn_name));
323 pfs_assert_not_owned(pn);
324
325 /*
326 * This is necessary because either process' privileges may
327 * have changed since the open() call.
328 */
329 if (!pfs_visible(curthread, pn, pvd->pvd_pid, &proc))
330 PFS_RETURN (EIO);
331
332 if (pn->pn_getextattr == NULL)
333 error = EOPNOTSUPP;
334 else
335 error = pn_getextattr(curthread, proc, pn,
336 va->a_attrnamespace, va->a_name, va->a_uio,
337 va->a_size, va->a_cred);
338
339 if (proc != NULL)
340 PROC_UNLOCK(proc);
341
342 PFS_RETURN (error);
343 }
344
345 /*
346 * Look up a file or directory
347 */
348 static int
349 pfs_lookup(struct vop_cachedlookup_args *va)
350 {
351 struct vnode *vn = va->a_dvp;
352 struct vnode **vpp = va->a_vpp;
353 struct componentname *cnp = va->a_cnp;
354 struct pfs_vdata *pvd = vn->v_data;
355 struct pfs_node *pd = pvd->pvd_pn;
356 struct pfs_node *pn, *pdn = NULL;
357 pid_t pid = pvd->pvd_pid;
358 char *pname;
359 int error, i, namelen, visible;
360
361 PFS_TRACE(("%.*s", (int)cnp->cn_namelen, cnp->cn_nameptr));
362 pfs_assert_not_owned(pd);
363
364 if (vn->v_type != VDIR)
365 PFS_RETURN (ENOTDIR);
366 KASSERT_PN_IS_DIR(pd);
367
368 error = VOP_ACCESS(vn, VEXEC, cnp->cn_cred, cnp->cn_thread);
369 if (error)
370 PFS_RETURN (error);
371
372 /*
373 * Don't support DELETE or RENAME. CREATE is supported so
374 * that O_CREAT will work, but the lookup will still fail if
375 * the file does not exist.
376 */
377 if ((cnp->cn_flags & ISLASTCN) &&
378 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME))
379 PFS_RETURN (EOPNOTSUPP);
380
381 /* shortcut: check if the name is too long */
382 if (cnp->cn_namelen >= PFS_NAMELEN)
383 PFS_RETURN (ENOENT);
384
385 /* check that parent directory is visible... */
386 if (!pfs_visible(curthread, pd, pvd->pvd_pid, NULL))
387 PFS_RETURN (ENOENT);
388
389 /* self */
390 namelen = cnp->cn_namelen;
391 pname = cnp->cn_nameptr;
392 if (namelen == 1 && pname[0] == '.') {
393 pn = pd;
394 *vpp = vn;
395 VREF(vn);
396 PFS_RETURN (0);
397 }
398
399 /* parent */
400 if (cnp->cn_flags & ISDOTDOT) {
401 if (pd->pn_type == pfstype_root)
402 PFS_RETURN (EIO);
403 VOP_UNLOCK(vn, 0, cnp->cn_thread);
404 KASSERT(pd->pn_parent != NULL,
405 ("%s(): non-root directory has no parent", __func__));
406 /*
407 * This one is tricky. Descendents of procdir nodes
408 * inherit their parent's process affinity, but
409 * there's no easy reverse mapping. For simplicity,
410 * we assume that if this node is a procdir, its
411 * parent isn't (which is correct as long as
412 * descendents of procdir nodes are never procdir
413 * nodes themselves)
414 */
415 if (pd->pn_type == pfstype_procdir)
416 pid = NO_PID;
417 pfs_lock(pd);
418 pn = pd->pn_parent;
419 pfs_unlock(pd);
420 goto got_pnode;
421 }
422
423 pfs_lock(pd);
424
425 /* named node */
426 for (pn = pd->pn_nodes; pn != NULL; pn = pn->pn_next)
427 if (pn->pn_type == pfstype_procdir)
428 pdn = pn;
429 else if (pn->pn_name[namelen] == '\0' &&
430 bcmp(pname, pn->pn_name, namelen) == 0) {
431 pfs_unlock(pd);
432 goto got_pnode;
433 }
434
435 /* process dependent node */
436 if ((pn = pdn) != NULL) {
437 pid = 0;
438 for (pid = 0, i = 0; i < namelen && isdigit(pname[i]); ++i)
439 if ((pid = pid * 10 + pname[i] - '') > PID_MAX)
440 break;
441 if (i == cnp->cn_namelen) {
442 pfs_unlock(pd);
443 goto got_pnode;
444 }
445 }
446
447 pfs_unlock(pd);
448
449 PFS_RETURN (ENOENT);
450
451 got_pnode:
452 pfs_assert_not_owned(pd);
453 pfs_assert_not_owned(pn);
454 visible = pfs_visible(curthread, pn, pid, NULL);
455 if (!visible) {
456 error = ENOENT;
457 goto failed;
458 }
459
460 error = pfs_vncache_alloc(vn->v_mount, vpp, pn, pid);
461 if (error)
462 goto failed;
463
464 if (cnp->cn_flags & ISDOTDOT)
465 vn_lock(vn, LK_EXCLUSIVE|LK_RETRY, cnp->cn_thread);
466 if (cnp->cn_flags & MAKEENTRY)
467 cache_enter(vn, *vpp, cnp);
468 PFS_RETURN (0);
469 failed:
470 if (cnp->cn_flags & ISDOTDOT)
471 vn_lock(vn, LK_EXCLUSIVE|LK_RETRY, cnp->cn_thread);
472 PFS_RETURN(error);
473 }
474
475 /*
476 * Open a file or directory.
477 */
478 static int
479 pfs_open(struct vop_open_args *va)
480 {
481 struct vnode *vn = va->a_vp;
482 struct pfs_vdata *pvd = vn->v_data;
483 struct pfs_node *pn = pvd->pvd_pn;
484 int mode = va->a_mode;
485
486 PFS_TRACE(("%s (mode 0x%x)", pn->pn_name, mode));
487 pfs_assert_not_owned(pn);
488
489 /* check if the requested mode is permitted */
490 if (((mode & FREAD) && !(mode & PFS_RD)) ||
491 ((mode & FWRITE) && !(mode & PFS_WR)))
492 PFS_RETURN (EPERM);
493
494 /* we don't support locking */
495 if ((mode & O_SHLOCK) || (mode & O_EXLOCK))
496 PFS_RETURN (EOPNOTSUPP);
497
498 PFS_RETURN (0);
499 }
500
501 /*
502 * Read from a file
503 */
504 static int
505 pfs_read(struct vop_read_args *va)
506 {
507 struct vnode *vn = va->a_vp;
508 struct pfs_vdata *pvd = vn->v_data;
509 struct pfs_node *pn = pvd->pvd_pn;
510 struct uio *uio = va->a_uio;
511 struct proc *proc;
512 struct sbuf *sb = NULL;
513 int error, locked;
514 unsigned int buflen, offset, resid;
515
516 PFS_TRACE(("%s", pn->pn_name));
517 pfs_assert_not_owned(pn);
518
519 if (vn->v_type != VREG)
520 PFS_RETURN (EINVAL);
521 KASSERT_PN_IS_FILE(pn);
522
523 if (!(pn->pn_flags & PFS_RD))
524 PFS_RETURN (EBADF);
525
526 if (pn->pn_fill == NULL)
527 PFS_RETURN (EIO);
528
529 /*
530 * This is necessary because either process' privileges may
531 * have changed since the open() call.
532 */
533 if (!pfs_visible(curthread, pn, pvd->pvd_pid, &proc))
534 PFS_RETURN (EIO);
535 if (proc != NULL) {
536 _PHOLD(proc);
537 PROC_UNLOCK(proc);
538 }
539
540 vhold(vn);
541 locked = VOP_ISLOCKED(vn, curthread);
542 VOP_UNLOCK(vn, 0, curthread);
543
544 if (pn->pn_flags & PFS_RAWRD) {
545 PFS_TRACE(("%lu resid", (unsigned long)uio->uio_resid));
546 error = pn_fill(curthread, proc, pn, NULL, uio);
547 PFS_TRACE(("%lu resid", (unsigned long)uio->uio_resid));
548 goto ret;
549 }
550
551 /* beaucoup sanity checks so we don't ask for bogus allocation */
552 if (uio->uio_offset < 0 || uio->uio_resid < 0 ||
553 (offset = uio->uio_offset) != uio->uio_offset ||
554 (resid = uio->uio_resid) != uio->uio_resid ||
555 (buflen = offset + resid + 1) < offset || buflen > INT_MAX) {
556 if (proc != NULL)
557 PRELE(proc);
558 error = EINVAL;
559 goto ret;
560 }
561 if (buflen > MAXPHYS + 1) {
562 error = EIO;
563 goto ret;
564 }
565
566 sb = sbuf_new(sb, NULL, buflen, 0);
567 if (sb == NULL) {
568 error = EIO;
569 goto ret;
570 }
571
572 error = pn_fill(curthread, proc, pn, sb, uio);
573
574 if (error) {
575 sbuf_delete(sb);
576 goto ret;
577 }
578
579 sbuf_finish(sb);
580 error = uiomove_frombuf(sbuf_data(sb), sbuf_len(sb), uio);
581 sbuf_delete(sb);
582 ret:
583 vn_lock(vn, locked | LK_RETRY, curthread);
584 vdrop(vn);
585 if (proc != NULL)
586 PRELE(proc);
587 PFS_RETURN (error);
588 }
589
590 /*
591 * Iterate through directory entries
592 */
593 static int
594 pfs_iterate(struct thread *td, struct proc *proc, struct pfs_node *pd,
595 struct pfs_node **pn, struct proc **p)
596 {
597 int visible;
598
599 sx_assert(&allproc_lock, SX_SLOCKED);
600 pfs_assert_owned(pd);
601 again:
602 if (*pn == NULL) {
603 /* first node */
604 *pn = pd->pn_nodes;
605 } else if ((*pn)->pn_type != pfstype_procdir) {
606 /* next node */
607 *pn = (*pn)->pn_next;
608 }
609 if (*pn != NULL && (*pn)->pn_type == pfstype_procdir) {
610 /* next process */
611 if (*p == NULL)
612 *p = LIST_FIRST(&allproc);
613 else
614 *p = LIST_NEXT(*p, p_list);
615 /* out of processes: next node */
616 if (*p == NULL)
617 *pn = (*pn)->pn_next;
618 else
619 PROC_LOCK(*p);
620 }
621
622 if ((*pn) == NULL)
623 return (-1);
624
625 if (*p != NULL) {
626 visible = pfs_visible_proc(td, *pn, *p);
627 PROC_UNLOCK(*p);
628 } else if (proc != NULL) {
629 visible = pfs_visible_proc(td, *pn, proc);
630 } else {
631 visible = 1;
632 }
633 if (!visible)
634 goto again;
635
636 return (0);
637 }
638
639 /*
640 * Return directory entries.
641 */
642 static int
643 pfs_readdir(struct vop_readdir_args *va)
644 {
645 struct vnode *vn = va->a_vp;
646 struct pfs_vdata *pvd = vn->v_data;
647 struct pfs_node *pd = pvd->pvd_pn;
648 pid_t pid = pvd->pvd_pid;
649 struct proc *p, *proc;
650 struct pfs_node *pn;
651 struct dirent *entry;
652 struct uio *uio;
653 off_t offset;
654 int error, i, resid;
655 char *buf, *ent;
656
657 KASSERT(pd->pn_info == vn->v_mount->mnt_data,
658 ("%s(): pn_info does not match mountpoint", __func__));
659 PFS_TRACE(("%s pid %lu", pd->pn_name, (unsigned long)pid));
660 pfs_assert_not_owned(pd);
661
662 if (vn->v_type != VDIR)
663 PFS_RETURN (ENOTDIR);
664 KASSERT_PN_IS_DIR(pd);
665 uio = va->a_uio;
666
667 /* only allow reading entire entries */
668 offset = uio->uio_offset;
669 resid = uio->uio_resid;
670 if (offset < 0 || offset % PFS_DELEN != 0 ||
671 (resid && resid < PFS_DELEN))
672 PFS_RETURN (EINVAL);
673 if (resid == 0)
674 PFS_RETURN (0);
675
676 /* can't do this while holding the proc lock... */
677 buf = malloc(resid, M_IOV, M_WAITOK | M_ZERO);
678 sx_slock(&allproc_lock);
679 pfs_lock(pd);
680
681 /* check if the directory is visible to the caller */
682 if (!pfs_visible(curthread, pd, pid, &proc)) {
683 sx_sunlock(&allproc_lock);
684 pfs_unlock(pd);
685 free(buf, M_IOV);
686 PFS_RETURN (ENOENT);
687 }
688 KASSERT(pid == NO_PID || proc != NULL,
689 ("%s(): no process for pid %lu", __func__, (unsigned long)pid));
690
691 /* skip unwanted entries */
692 for (pn = NULL, p = NULL; offset > 0; offset -= PFS_DELEN) {
693 if (pfs_iterate(curthread, proc, pd, &pn, &p) == -1) {
694 /* nothing left... */
695 if (proc != NULL)
696 PROC_UNLOCK(proc);
697 pfs_unlock(pd);
698 sx_sunlock(&allproc_lock);
699 free(buf, M_IOV);
700 PFS_RETURN (0);
701 }
702 }
703
704 /* fill in entries */
705 ent = buf;
706 while (pfs_iterate(curthread, proc, pd, &pn, &p) != -1 &&
707 resid >= PFS_DELEN) {
708 entry = (struct dirent *)ent;
709 entry->d_reclen = PFS_DELEN;
710 entry->d_fileno = pn_fileno(pn, pid);
711 /* PFS_DELEN was picked to fit PFS_NAMLEN */
712 for (i = 0; i < PFS_NAMELEN - 1 && pn->pn_name[i] != '\0'; ++i)
713 entry->d_name[i] = pn->pn_name[i];
714 entry->d_name[i] = 0;
715 entry->d_namlen = i;
716 switch (pn->pn_type) {
717 case pfstype_procdir:
718 KASSERT(p != NULL,
719 ("reached procdir node with p == NULL"));
720 entry->d_namlen = snprintf(entry->d_name,
721 PFS_NAMELEN, "%d", p->p_pid);
722 /* fall through */
723 case pfstype_root:
724 case pfstype_dir:
725 case pfstype_this:
726 case pfstype_parent:
727 entry->d_type = DT_DIR;
728 break;
729 case pfstype_file:
730 entry->d_type = DT_REG;
731 break;
732 case pfstype_symlink:
733 entry->d_type = DT_LNK;
734 break;
735 default:
736 panic("%s has unexpected node type: %d", pn->pn_name, pn->pn_type);
737 }
738 PFS_TRACE(("%s", entry->d_name));
739 offset += PFS_DELEN;
740 resid -= PFS_DELEN;
741 ent += PFS_DELEN;
742 }
743 if (proc != NULL)
744 PROC_UNLOCK(proc);
745 pfs_unlock(pd);
746 sx_sunlock(&allproc_lock);
747 PFS_TRACE(("%zd bytes", ent - buf));
748 error = uiomove(buf, ent - buf, uio);
749 free(buf, M_IOV);
750 PFS_RETURN (error);
751 }
752
753 /*
754 * Read a symbolic link
755 */
756 static int
757 pfs_readlink(struct vop_readlink_args *va)
758 {
759 struct vnode *vn = va->a_vp;
760 struct pfs_vdata *pvd = vn->v_data;
761 struct pfs_node *pn = pvd->pvd_pn;
762 struct uio *uio = va->a_uio;
763 struct proc *proc = NULL;
764 struct thread *td = curthread;
765 char buf[PATH_MAX];
766 struct sbuf sb;
767 int error, locked;
768
769 PFS_TRACE(("%s", pn->pn_name));
770 pfs_assert_not_owned(pn);
771
772 if (vn->v_type != VLNK)
773 PFS_RETURN (EINVAL);
774 KASSERT_PN_IS_LINK(pn);
775
776 if (pn->pn_fill == NULL)
777 PFS_RETURN (EIO);
778
779 if (pvd->pvd_pid != NO_PID) {
780 if ((proc = pfind(pvd->pvd_pid)) == NULL)
781 PFS_RETURN (EIO);
782 if (proc->p_flag & P_WEXIT) {
783 PROC_UNLOCK(proc);
784 PFS_RETURN (EIO);
785 }
786 _PHOLD(proc);
787 PROC_UNLOCK(proc);
788 }
789 vhold(vn);
790 locked = VOP_ISLOCKED(vn, td);
791 VOP_UNLOCK(vn, 0, td);
792
793 /* sbuf_new() can't fail with a static buffer */
794 sbuf_new(&sb, buf, sizeof buf, 0);
795
796 error = pn_fill(td, proc, pn, &sb, NULL);
797
798 if (proc != NULL)
799 PRELE(proc);
800 vn_lock(vn, locked | LK_RETRY, td);
801 vdrop(vn);
802
803 if (error) {
804 sbuf_delete(&sb);
805 PFS_RETURN (error);
806 }
807
808 if (sbuf_finish(&sb) != 0) {
809 sbuf_delete(&sb);
810 PFS_RETURN (ENAMETOOLONG);
811 }
812
813 error = uiomove_frombuf(sbuf_data(&sb), sbuf_len(&sb), uio);
814 sbuf_delete(&sb);
815 PFS_RETURN (error);
816 }
817
818 /*
819 * Reclaim a vnode
820 */
821 static int
822 pfs_reclaim(struct vop_reclaim_args *va)
823 {
824 struct vnode *vn = va->a_vp;
825 struct pfs_vdata *pvd = vn->v_data;
826 struct pfs_node *pn = pvd->pvd_pn;
827
828 PFS_TRACE(("%s", pn->pn_name));
829 pfs_assert_not_owned(pn);
830
831 return (pfs_vncache_free(va->a_vp));
832 }
833
834 /*
835 * Set attributes
836 */
837 static int
838 pfs_setattr(struct vop_setattr_args *va)
839 {
840 struct vnode *vn = va->a_vp;
841 struct pfs_vdata *pvd = vn->v_data;
842 struct pfs_node *pn = pvd->pvd_pn;
843
844 PFS_TRACE(("%s", pn->pn_name));
845 pfs_assert_not_owned(pn);
846
847 PFS_RETURN (EOPNOTSUPP);
848 }
849
850 /*
851 * Write to a file
852 */
853 static int
854 pfs_write(struct vop_write_args *va)
855 {
856 struct vnode *vn = va->a_vp;
857 struct pfs_vdata *pvd = vn->v_data;
858 struct pfs_node *pn = pvd->pvd_pn;
859 struct uio *uio = va->a_uio;
860 struct proc *proc;
861 struct sbuf sb;
862 int error;
863
864 PFS_TRACE(("%s", pn->pn_name));
865 pfs_assert_not_owned(pn);
866
867 if (vn->v_type != VREG)
868 PFS_RETURN (EINVAL);
869 KASSERT_PN_IS_FILE(pn);
870
871 if (!(pn->pn_flags & PFS_WR))
872 PFS_RETURN (EBADF);
873
874 if (pn->pn_fill == NULL)
875 PFS_RETURN (EIO);
876
877 /*
878 * This is necessary because either process' privileges may
879 * have changed since the open() call.
880 */
881 if (!pfs_visible(curthread, pn, pvd->pvd_pid, &proc))
882 PFS_RETURN (EIO);
883 if (proc != NULL) {
884 _PHOLD(proc);
885 PROC_UNLOCK(proc);
886 }
887
888 if (pn->pn_flags & PFS_RAWWR) {
889 error = pn_fill(curthread, proc, pn, NULL, uio);
890 if (proc != NULL)
891 PRELE(proc);
892 PFS_RETURN (error);
893 }
894
895 sbuf_uionew(&sb, uio, &error);
896 if (error) {
897 if (proc != NULL)
898 PRELE(proc);
899 PFS_RETURN (error);
900 }
901
902 error = pn_fill(curthread, proc, pn, &sb, uio);
903
904 sbuf_delete(&sb);
905 if (proc != NULL)
906 PRELE(proc);
907 PFS_RETURN (error);
908 }
909
910 /*
911 * Vnode operations
912 */
913 struct vop_vector pfs_vnodeops = {
914 .vop_default = &default_vnodeops,
915
916 .vop_access = pfs_access,
917 .vop_cachedlookup = pfs_lookup,
918 .vop_close = pfs_close,
919 .vop_create = VOP_EOPNOTSUPP,
920 .vop_getattr = pfs_getattr,
921 .vop_getextattr = pfs_getextattr,
922 .vop_ioctl = pfs_ioctl,
923 .vop_link = VOP_EOPNOTSUPP,
924 .vop_lookup = vfs_cache_lookup,
925 .vop_mkdir = VOP_EOPNOTSUPP,
926 .vop_mknod = VOP_EOPNOTSUPP,
927 .vop_open = pfs_open,
928 .vop_read = pfs_read,
929 .vop_readdir = pfs_readdir,
930 .vop_readlink = pfs_readlink,
931 .vop_reclaim = pfs_reclaim,
932 .vop_remove = VOP_EOPNOTSUPP,
933 .vop_rename = VOP_EOPNOTSUPP,
934 .vop_rmdir = VOP_EOPNOTSUPP,
935 .vop_setattr = pfs_setattr,
936 .vop_symlink = VOP_EOPNOTSUPP,
937 .vop_write = pfs_write,
938 /* XXX I've probably forgotten a few that need VOP_EOPNOTSUPP */
939 };
Cache object: 9e1fc7474794ccf8005617f3307d9c6c
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