1 /* $NetBSD: vfs_syscalls.c,v 1.205.2.1 2007/02/06 21:16:37 bouyer Exp $ */
2
3 /*
4 * Copyright (c) 1989, 1993
5 * The Regents of the University of California. All rights reserved.
6 * (c) UNIX System Laboratories, Inc.
7 * All or some portions of this file are derived from material licensed
8 * to the University of California by American Telephone and Telegraph
9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
10 * the permission of UNIX System Laboratories, Inc.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * @(#)vfs_syscalls.c 8.42 (Berkeley) 7/31/95
37 */
38
39 #include <sys/cdefs.h>
40 __KERNEL_RCSID(0, "$NetBSD: vfs_syscalls.c,v 1.205.2.1 2007/02/06 21:16:37 bouyer Exp $");
41
42 #include "opt_compat_netbsd.h"
43 #include "opt_compat_43.h"
44 #include "opt_ktrace.h"
45 #include "fss.h"
46
47 #include <sys/param.h>
48 #include <sys/systm.h>
49 #include <sys/namei.h>
50 #include <sys/filedesc.h>
51 #include <sys/kernel.h>
52 #include <sys/file.h>
53 #include <sys/stat.h>
54 #include <sys/vnode.h>
55 #include <sys/mount.h>
56 #include <sys/proc.h>
57 #include <sys/uio.h>
58 #include <sys/malloc.h>
59 #include <sys/dirent.h>
60 #include <sys/sysctl.h>
61 #include <sys/sa.h>
62 #include <sys/syscallargs.h>
63 #ifdef KTRACE
64 #include <sys/ktrace.h>
65 #endif
66
67 #include <miscfs/genfs/genfs.h>
68 #include <miscfs/syncfs/syncfs.h>
69
70 #if NFSS > 0
71 #include <dev/fssvar.h>
72 #endif
73
74 MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount struct");
75
76 static int change_dir(struct nameidata *, struct proc *);
77 static int change_flags(struct vnode *, u_long, struct proc *);
78 static int change_mode(struct vnode *, int, struct proc *p);
79 static int change_owner(struct vnode *, uid_t, gid_t, struct proc *, int);
80 static int change_utimes(struct vnode *vp, const struct timeval *,
81 struct proc *p);
82 static int rename_files(const char *, const char *, struct proc *, int);
83 static int dostatfs(struct mount *, struct statfs *, struct proc *, int, int);
84
85 void checkdirs(struct vnode *);
86
87 int dovfsusermount = 0;
88
89 /*
90 * Virtual File System System Calls
91 */
92
93 /*
94 * Mount a file system.
95 */
96
97 #if defined(COMPAT_09) || defined(COMPAT_43)
98 /*
99 * This table is used to maintain compatibility with 4.3BSD
100 * and NetBSD 0.9 mount syscalls. Note, the order is important!
101 *
102 * Do not modify this table. It should only contain filesystems
103 * supported by NetBSD 0.9 and 4.3BSD.
104 */
105 const char * const mountcompatnames[] = {
106 NULL, /* 0 = MOUNT_NONE */
107 MOUNT_FFS, /* 1 = MOUNT_UFS */
108 MOUNT_NFS, /* 2 */
109 MOUNT_MFS, /* 3 */
110 MOUNT_MSDOS, /* 4 */
111 MOUNT_CD9660, /* 5 = MOUNT_ISOFS */
112 MOUNT_FDESC, /* 6 */
113 MOUNT_KERNFS, /* 7 */
114 NULL, /* 8 = MOUNT_DEVFS */
115 MOUNT_AFS, /* 9 */
116 };
117 const int nmountcompatnames = sizeof(mountcompatnames) /
118 sizeof(mountcompatnames[0]);
119 #endif /* COMPAT_09 || COMPAT_43 */
120
121 /* ARGSUSED */
122 int
123 sys_mount(l, v, retval)
124 struct lwp *l;
125 void *v;
126 register_t *retval;
127 {
128 struct sys_mount_args /* {
129 syscallarg(const char *) type;
130 syscallarg(const char *) path;
131 syscallarg(int) flags;
132 syscallarg(void *) data;
133 } */ *uap = v;
134 struct proc *p = l->l_proc;
135 struct vnode *vp;
136 struct mount *mp;
137 int error, flag = 0;
138 char fstypename[MFSNAMELEN];
139 struct vattr va;
140 struct nameidata nd;
141 struct vfsops *vfs;
142
143 if (dovfsusermount == 0 && (SCARG(uap, flags) & MNT_GETARGS) == 0 &&
144 (error = suser(p->p_ucred, &p->p_acflag)))
145 return (error);
146 /*
147 * Get vnode to be covered
148 */
149 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE,
150 SCARG(uap, path), p);
151 if ((error = namei(&nd)) != 0)
152 return (error);
153 vp = nd.ni_vp;
154 /*
155 * A lookup in VFS_MOUNT might result in an attempt to
156 * lock this vnode again, so make the lock recursive.
157 */
158 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_SETRECURSE);
159 if (SCARG(uap, flags) & (MNT_UPDATE | MNT_GETARGS)) {
160 if ((vp->v_flag & VROOT) == 0) {
161 vput(vp);
162 return (EINVAL);
163 }
164 mp = vp->v_mount;
165 flag = mp->mnt_flag;
166 vfs = mp->mnt_op;
167 /*
168 * We only allow the filesystem to be reloaded if it
169 * is currently mounted read-only.
170 */
171 if ((SCARG(uap, flags) & MNT_RELOAD) &&
172 ((mp->mnt_flag & MNT_RDONLY) == 0)) {
173 vput(vp);
174 return (EOPNOTSUPP); /* Needs translation */
175 }
176 /*
177 * In "highly secure" mode, don't let the caller do anything
178 * but downgrade a filesystem from read-write to read-only.
179 * (see also below; MNT_UPDATE or MNT_GETARGS is required.)
180 */
181 if (securelevel >= 2 &&
182 SCARG(uap, flags) != MNT_GETARGS &&
183 SCARG(uap, flags) !=
184 (mp->mnt_flag | MNT_RDONLY |
185 MNT_RELOAD | MNT_FORCE | MNT_UPDATE)) {
186 vput(vp);
187 return (EPERM);
188 }
189 mp->mnt_flag |= SCARG(uap, flags) &
190 (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_GETARGS);
191 /*
192 * Only root, or the user that did the original mount is
193 * permitted to update it.
194 */
195 if ((mp->mnt_flag & MNT_GETARGS) == 0 &&
196 mp->mnt_stat.f_owner != p->p_ucred->cr_uid &&
197 (error = suser(p->p_ucred, &p->p_acflag)) != 0) {
198 vput(vp);
199 return (error);
200 }
201 /*
202 * Do not allow NFS export by non-root users. For non-root
203 * users, silently enforce MNT_NOSUID and MNT_NODEV, and
204 * MNT_NOEXEC if mount point is already MNT_NOEXEC.
205 */
206 if (p->p_ucred->cr_uid != 0) {
207 if (SCARG(uap, flags) & MNT_EXPORTED) {
208 vput(vp);
209 return (EPERM);
210 }
211 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV;
212 if (flag & MNT_NOEXEC)
213 SCARG(uap, flags) |= MNT_NOEXEC;
214 }
215 if (vfs_busy(mp, LK_NOWAIT, 0)) {
216 vput(vp);
217 return (EPERM);
218 }
219 goto update;
220 } else {
221 if (securelevel >= 2) {
222 vput(vp);
223 return (EPERM);
224 }
225 }
226 /*
227 * If the user is not root, ensure that they own the directory
228 * onto which we are attempting to mount.
229 */
230 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) != 0 ||
231 (va.va_uid != p->p_ucred->cr_uid &&
232 (error = suser(p->p_ucred, &p->p_acflag)) != 0)) {
233 vput(vp);
234 return (error);
235 }
236 /*
237 * Do not allow NFS export by non-root users. For non-root users,
238 * silently enforce MNT_NOSUID and MNT_NODEV, and MNT_NOEXEC if the
239 * mount point is already MNT_NOEXEC.
240 */
241 if (p->p_ucred->cr_uid != 0) {
242 if (SCARG(uap, flags) & MNT_EXPORTED) {
243 vput(vp);
244 return (EPERM);
245 }
246 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV;
247 if (vp->v_mount->mnt_flag & MNT_NOEXEC)
248 SCARG(uap, flags) |= MNT_NOEXEC;
249 }
250 if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) {
251 vput(vp);
252 return (error);
253 }
254 if (vp->v_type != VDIR) {
255 vput(vp);
256 return (ENOTDIR);
257 }
258 error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL);
259 if (error) {
260 #if defined(COMPAT_09) || defined(COMPAT_43)
261 /*
262 * Historically filesystem types were identified by number.
263 * If we get an integer for the filesystem type instead of a
264 * string, we check to see if it matches one of the historic
265 * filesystem types.
266 */
267 u_long fsindex = (u_long)SCARG(uap, type);
268 if (fsindex >= nmountcompatnames ||
269 mountcompatnames[fsindex] == NULL) {
270 vput(vp);
271 return (ENODEV);
272 }
273 strncpy(fstypename, mountcompatnames[fsindex], MFSNAMELEN);
274 #else
275 vput(vp);
276 return (error);
277 #endif
278 }
279 #ifdef COMPAT_10
280 /* Accept `ufs' as an alias for `ffs'. */
281 if (!strncmp(fstypename, "ufs", MFSNAMELEN))
282 strncpy(fstypename, "ffs", MFSNAMELEN);
283 #endif
284 if ((vfs = vfs_getopsbyname(fstypename)) == NULL) {
285 vput(vp);
286 return (ENODEV);
287 }
288 if (vp->v_mountedhere != NULL) {
289 vput(vp);
290 return (EBUSY);
291 }
292
293 /*
294 * Allocate and initialize the file system.
295 */
296 mp = (struct mount *)malloc((u_long)sizeof(struct mount),
297 M_MOUNT, M_WAITOK);
298 memset((char *)mp, 0, (u_long)sizeof(struct mount));
299 lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0);
300 (void)vfs_busy(mp, LK_NOWAIT, 0);
301 mp->mnt_op = vfs;
302 vfs->vfs_refcount++;
303 mp->mnt_vnodecovered = vp;
304 mp->mnt_stat.f_owner = p->p_ucred->cr_uid;
305 mp->mnt_unmounter = NULL;
306
307 /*
308 * The underlying file system may refuse the mount for
309 * various reasons. Allow the user to force it to happen.
310 */
311 mp->mnt_flag |= SCARG(uap, flags) & MNT_FORCE;
312 update:
313 /*
314 * Set the mount level flags.
315 */
316 if (SCARG(uap, flags) & MNT_RDONLY)
317 mp->mnt_flag |= MNT_RDONLY;
318 else if (mp->mnt_flag & MNT_RDONLY)
319 mp->mnt_iflag |= IMNT_WANTRDWR;
320 mp->mnt_flag &=
321 ~(MNT_NOSUID | MNT_NOEXEC | MNT_NODEV |
322 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP |
323 MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | MNT_SOFTDEP);
324 mp->mnt_flag |= SCARG(uap, flags) &
325 (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV |
326 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP |
327 MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | MNT_SOFTDEP |
328 MNT_IGNORE);
329 /*
330 * Mount the filesystem.
331 */
332 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p);
333 if (mp->mnt_flag & (MNT_UPDATE | MNT_GETARGS)) {
334 if (mp->mnt_iflag & IMNT_WANTRDWR)
335 mp->mnt_flag &= ~MNT_RDONLY;
336 if (error || (mp->mnt_flag & MNT_GETARGS))
337 mp->mnt_flag = flag;
338 mp->mnt_flag &=~
339 (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_GETARGS);
340 mp->mnt_iflag &=~ IMNT_WANTRDWR;
341 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) {
342 if (mp->mnt_syncer == NULL)
343 error = vfs_allocate_syncvnode(mp);
344 } else {
345 if (mp->mnt_syncer != NULL)
346 vfs_deallocate_syncvnode(mp);
347 }
348 vfs_unbusy(mp);
349 VOP_UNLOCK(vp, 0);
350 vrele(vp);
351 return (error);
352 }
353 /*
354 * Put the new filesystem on the mount list after root.
355 */
356 cache_purge(vp);
357 if (!error) {
358 mp->mnt_flag &=~
359 (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_GETARGS);
360 mp->mnt_iflag &=~ IMNT_WANTRDWR;
361 vp->v_mountedhere = mp;
362 simple_lock(&mountlist_slock);
363 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
364 simple_unlock(&mountlist_slock);
365 checkdirs(vp);
366 VOP_UNLOCK(vp, 0);
367 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0)
368 error = vfs_allocate_syncvnode(mp);
369 vfs_unbusy(mp);
370 (void) VFS_STATFS(mp, &mp->mnt_stat, p);
371 if ((error = VFS_START(mp, 0, p)))
372 vrele(vp);
373 } else {
374 vp->v_mountedhere = (struct mount *)0;
375 vfs->vfs_refcount--;
376 vfs_unbusy(mp);
377 free(mp, M_MOUNT);
378 vput(vp);
379 }
380 return (error);
381 }
382
383 /*
384 * Scan all active processes to see if any of them have a current
385 * or root directory onto which the new filesystem has just been
386 * mounted. If so, replace them with the new mount point.
387 */
388 void
389 checkdirs(olddp)
390 struct vnode *olddp;
391 {
392 struct cwdinfo *cwdi;
393 struct vnode *newdp;
394 struct proc *p;
395
396 if (olddp->v_usecount == 1)
397 return;
398 if (VFS_ROOT(olddp->v_mountedhere, &newdp))
399 panic("mount: lost mount");
400 proclist_lock_read();
401 LIST_FOREACH(p, &allproc, p_list) {
402 cwdi = p->p_cwdi;
403 if (cwdi->cwdi_cdir == olddp) {
404 vrele(cwdi->cwdi_cdir);
405 VREF(newdp);
406 cwdi->cwdi_cdir = newdp;
407 }
408 if (cwdi->cwdi_rdir == olddp) {
409 vrele(cwdi->cwdi_rdir);
410 VREF(newdp);
411 cwdi->cwdi_rdir = newdp;
412 }
413 }
414 proclist_unlock_read();
415 if (rootvnode == olddp) {
416 vrele(rootvnode);
417 VREF(newdp);
418 rootvnode = newdp;
419 }
420 vput(newdp);
421 }
422
423 /*
424 * Unmount a file system.
425 *
426 * Note: unmount takes a path to the vnode mounted on as argument,
427 * not special file (as before).
428 */
429 /* ARGSUSED */
430 int
431 sys_unmount(l, v, retval)
432 struct lwp *l;
433 void *v;
434 register_t *retval;
435 {
436 struct sys_unmount_args /* {
437 syscallarg(const char *) path;
438 syscallarg(int) flags;
439 } */ *uap = v;
440 struct proc *p = l->l_proc;
441 struct vnode *vp;
442 struct mount *mp;
443 int error;
444 struct nameidata nd;
445
446 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
447 SCARG(uap, path), p);
448 if ((error = namei(&nd)) != 0)
449 return (error);
450 vp = nd.ni_vp;
451 mp = vp->v_mount;
452
453 /*
454 * Only root, or the user that did the original mount is
455 * permitted to unmount this filesystem.
456 */
457 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) &&
458 (error = suser(p->p_ucred, &p->p_acflag)) != 0) {
459 vput(vp);
460 return (error);
461 }
462
463 /*
464 * Don't allow unmounting the root file system.
465 */
466 if (mp->mnt_flag & MNT_ROOTFS) {
467 vput(vp);
468 return (EINVAL);
469 }
470
471 /*
472 * Must be the root of the filesystem
473 */
474 if ((vp->v_flag & VROOT) == 0) {
475 vput(vp);
476 return (EINVAL);
477 }
478 vput(vp);
479
480 /*
481 * XXX Freeze syncer. Must do this before locking the
482 * mount point. See dounmount() for details.
483 */
484 lockmgr(&syncer_lock, LK_EXCLUSIVE, NULL);
485
486 if (vfs_busy(mp, 0, 0)) {
487 lockmgr(&syncer_lock, LK_RELEASE, NULL);
488 return (EBUSY);
489 }
490
491 return (dounmount(mp, SCARG(uap, flags), p));
492 }
493
494 /*
495 * Do the actual file system unmount. File system is assumed to have been
496 * marked busy by the caller.
497 */
498 int
499 dounmount(mp, flags, p)
500 struct mount *mp;
501 int flags;
502 struct proc *p;
503 {
504 struct vnode *coveredvp;
505 int error;
506 int async;
507 int used_syncer;
508
509 simple_lock(&mountlist_slock);
510 vfs_unbusy(mp);
511 used_syncer = (mp->mnt_syncer != NULL);
512
513 /*
514 * XXX Syncer must be frozen when we get here. This should really
515 * be done on a per-mountpoint basis, but especially the softdep
516 * code possibly called from the syncer doens't exactly work on a
517 * per-mountpoint basis, so the softdep code would become a maze
518 * of vfs_busy() calls.
519 *
520 * The caller of dounmount() must acquire syncer_lock because
521 * the syncer itself acquires locks in syncer_lock -> vfs_busy
522 * order, and we must preserve that order to avoid deadlock.
523 *
524 * So, if the file system did not use the syncer, now is
525 * the time to release the syncer_lock.
526 */
527 if (used_syncer == 0)
528 lockmgr(&syncer_lock, LK_RELEASE, NULL);
529
530 mp->mnt_iflag |= IMNT_UNMOUNT;
531 mp->mnt_unmounter = p;
532 lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK, &mountlist_slock);
533 vn_start_write(NULL, &mp, V_WAIT);
534
535 if (mp->mnt_flag & MNT_EXPUBLIC)
536 vfs_setpublicfs(NULL, NULL, NULL);
537 async = mp->mnt_flag & MNT_ASYNC;
538 mp->mnt_flag &= ~MNT_ASYNC;
539 cache_purgevfs(mp); /* remove cache entries for this file sys */
540 if (mp->mnt_syncer != NULL)
541 vfs_deallocate_syncvnode(mp);
542 if (((mp->mnt_flag & MNT_RDONLY) ||
543 #if NFSS > 0
544 (error = fss_umount_hook(mp, (flags & MNT_FORCE))) == 0 ||
545 #endif
546 (error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0) ||
547 (flags & MNT_FORCE))
548 error = VFS_UNMOUNT(mp, flags, p);
549 vn_finished_write(mp, 0);
550 simple_lock(&mountlist_slock);
551 if (error) {
552 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0)
553 (void) vfs_allocate_syncvnode(mp);
554 mp->mnt_iflag &= ~IMNT_UNMOUNT;
555 mp->mnt_unmounter = NULL;
556 mp->mnt_flag |= async;
557 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE,
558 &mountlist_slock);
559 if (used_syncer)
560 lockmgr(&syncer_lock, LK_RELEASE, NULL);
561 while (mp->mnt_wcnt > 0) {
562 wakeup(mp);
563 tsleep(&mp->mnt_wcnt, PVFS, "mntwcnt1", 0);
564 }
565 return (error);
566 }
567 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list);
568 if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) {
569 coveredvp->v_mountedhere = NULL;
570 vrele(coveredvp);
571 }
572 mp->mnt_op->vfs_refcount--;
573 if (LIST_FIRST(&mp->mnt_vnodelist) != NULL)
574 panic("unmount: dangling vnode");
575 mp->mnt_iflag |= IMNT_GONE;
576 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &mountlist_slock);
577 if (used_syncer)
578 lockmgr(&syncer_lock, LK_RELEASE, NULL);
579 while(mp->mnt_wcnt > 0) {
580 wakeup(mp);
581 tsleep(&mp->mnt_wcnt, PVFS, "mntwcnt2", 0);
582 }
583 free(mp, M_MOUNT);
584 return (0);
585 }
586
587 /*
588 * Sync each mounted filesystem.
589 */
590 #ifdef DEBUG
591 int syncprt = 0;
592 struct ctldebug debug0 = { "syncprt", &syncprt };
593 #endif
594
595 /* ARGSUSED */
596 int
597 sys_sync(l, v, retval)
598 struct lwp *l;
599 void *v;
600 register_t *retval;
601 {
602 struct mount *mp, *nmp;
603 int asyncflag;
604 struct proc *p = l == NULL ? &proc0 : l->l_proc;
605
606 simple_lock(&mountlist_slock);
607 for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) {
608 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) {
609 nmp = mp->mnt_list.cqe_prev;
610 continue;
611 }
612 if ((mp->mnt_flag & MNT_RDONLY) == 0 &&
613 vn_start_write(NULL, &mp, V_NOWAIT) == 0) {
614 asyncflag = mp->mnt_flag & MNT_ASYNC;
615 mp->mnt_flag &= ~MNT_ASYNC;
616 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p);
617 if (asyncflag)
618 mp->mnt_flag |= MNT_ASYNC;
619 vn_finished_write(mp, 0);
620 }
621 simple_lock(&mountlist_slock);
622 nmp = mp->mnt_list.cqe_prev;
623 vfs_unbusy(mp);
624
625 }
626 simple_unlock(&mountlist_slock);
627 #ifdef DEBUG
628 if (syncprt)
629 vfs_bufstats();
630 #endif /* DEBUG */
631 return (0);
632 }
633
634 /*
635 * Change filesystem quotas.
636 */
637 /* ARGSUSED */
638 int
639 sys_quotactl(l, v, retval)
640 struct lwp *l;
641 void *v;
642 register_t *retval;
643 {
644 struct sys_quotactl_args /* {
645 syscallarg(const char *) path;
646 syscallarg(int) cmd;
647 syscallarg(int) uid;
648 syscallarg(caddr_t) arg;
649 } */ *uap = v;
650 struct proc *p = l->l_proc;
651 struct mount *mp;
652 int error;
653 struct nameidata nd;
654
655 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
656 if ((error = namei(&nd)) != 0)
657 return (error);
658 error = vn_start_write(nd.ni_vp, &mp, V_WAIT | V_PCATCH);
659 vrele(nd.ni_vp);
660 if (error)
661 return (error);
662 error = VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid),
663 SCARG(uap, arg), p);
664 vn_finished_write(mp, 0);
665 return (error);
666 }
667
668 static int
669 dostatfs(struct mount *mp, struct statfs *sp, struct proc *p, int flags,
670 int root)
671 {
672 struct cwdinfo *cwdi = p->p_cwdi;
673 int error = 0;
674
675 /*
676 * If MNT_NOWAIT or MNT_LAZY is specified, do not
677 * refresh the fsstat cache. MNT_WAIT or MNT_LAZY
678 * overrides MNT_NOWAIT.
679 */
680 if (flags == MNT_NOWAIT || flags == MNT_LAZY ||
681 (flags != MNT_WAIT && flags != 0)) {
682 memcpy(sp, &mp->mnt_stat, sizeof(*sp));
683 goto done;
684 }
685
686 if ((error = VFS_STATFS(mp, sp, p)) != 0) {
687 return error;
688 }
689
690 if (cwdi->cwdi_rdir == NULL)
691 (void)memcpy(&mp->mnt_stat, sp, sizeof(mp->mnt_stat));
692 done:
693 if (cwdi->cwdi_rdir != NULL) {
694 size_t len;
695 char *bp;
696 char *path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
697 if (!path)
698 return ENOMEM;
699
700 bp = path + MAXPATHLEN;
701 *--bp = '\0';
702 error = getcwd_common(cwdi->cwdi_rdir, rootvnode, &bp, path,
703 MAXPATHLEN / 2, 0, p);
704 if (error) {
705 free(path, M_TEMP);
706 return error;
707 }
708 len = strlen(bp);
709 /*
710 * for mount points that are below our root, we can see
711 * them, so we fix up the pathname and return them. The
712 * rest we cannot see, so we don't allow viewing the
713 * data.
714 */
715 if (strncmp(bp, sp->f_mntonname, len) == 0) {
716 strlcpy(sp->f_mntonname, &sp->f_mntonname[len],
717 sizeof(sp->f_mntonname));
718 if (sp->f_mntonname[0] == '\0')
719 (void)strlcpy(sp->f_mntonname, "/",
720 sizeof(sp->f_mntonname));
721 } else {
722 if (root)
723 (void)strlcpy(sp->f_mntonname, "/",
724 sizeof(sp->f_mntonname));
725 else
726 error = EPERM;
727 }
728 free(path, M_TEMP);
729 }
730 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
731 sp->f_oflags = sp->f_flags & 0xffff;
732 return error;
733 }
734
735 /*
736 * Get filesystem statistics.
737 */
738 /* ARGSUSED */
739 int
740 sys_statfs(l, v, retval)
741 struct lwp *l;
742 void *v;
743 register_t *retval;
744 {
745 struct sys_statfs_args /* {
746 syscallarg(const char *) path;
747 syscallarg(struct statfs *) buf;
748 } */ *uap = v;
749 struct proc *p = l->l_proc;
750 struct mount *mp;
751 struct statfs sbuf;
752 int error;
753 struct nameidata nd;
754
755 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
756 if ((error = namei(&nd)) != 0)
757 return error;
758 mp = nd.ni_vp->v_mount;
759 vrele(nd.ni_vp);
760 if ((error = dostatfs(mp, &sbuf, p, 0, 1)) != 0)
761 return error;
762 return copyout(&sbuf, SCARG(uap, buf), sizeof(sbuf));
763 }
764
765 /*
766 * Get filesystem statistics.
767 */
768 /* ARGSUSED */
769 int
770 sys_fstatfs(l, v, retval)
771 struct lwp *l;
772 void *v;
773 register_t *retval;
774 {
775 struct sys_fstatfs_args /* {
776 syscallarg(int) fd;
777 syscallarg(struct statfs *) buf;
778 } */ *uap = v;
779 struct proc *p = l->l_proc;
780 struct file *fp;
781 struct mount *mp;
782 struct statfs sbuf;
783 int error;
784
785 /* getvnode() will use the descriptor for us */
786 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
787 return (error);
788 mp = ((struct vnode *)fp->f_data)->v_mount;
789 if ((error = dostatfs(mp, &sbuf, p, 0, 1)) != 0)
790 goto out;
791 error = copyout(&sbuf, SCARG(uap, buf), sizeof(sbuf));
792 out:
793 FILE_UNUSE(fp, p);
794 return error;
795 }
796
797
798 /*
799 * Get statistics on all filesystems.
800 */
801 int
802 sys_getfsstat(l, v, retval)
803 struct lwp *l;
804 void *v;
805 register_t *retval;
806 {
807 struct sys_getfsstat_args /* {
808 syscallarg(struct statfs *) buf;
809 syscallarg(long) bufsize;
810 syscallarg(int) flags;
811 } */ *uap = v;
812 int root = 0;
813 struct proc *p = l->l_proc;
814 struct mount *mp, *nmp;
815 struct statfs sbuf;
816 caddr_t sfsp;
817 long count, maxcount, error = 0;
818
819 maxcount = SCARG(uap, bufsize) / sizeof(struct statfs);
820 sfsp = (caddr_t)SCARG(uap, buf);
821 simple_lock(&mountlist_slock);
822 count = 0;
823 for (mp = CIRCLEQ_FIRST(&mountlist); mp != (void *)&mountlist;
824 mp = nmp) {
825 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) {
826 nmp = CIRCLEQ_NEXT(mp, mnt_list);
827 continue;
828 }
829 if (sfsp && count < maxcount) {
830 error = dostatfs(mp, &sbuf, p, SCARG(uap, flags), 0);
831 if (error) {
832 simple_lock(&mountlist_slock);
833 nmp = CIRCLEQ_NEXT(mp, mnt_list);
834 vfs_unbusy(mp);
835 continue;
836 }
837 error = copyout(&sbuf, sfsp, sizeof(sbuf));
838 if (error) {
839 vfs_unbusy(mp);
840 return (error);
841 }
842 sfsp += sizeof(sbuf);
843 root |= strcmp(sbuf.f_mntonname, "/") == 0;
844 }
845 count++;
846 simple_lock(&mountlist_slock);
847 nmp = CIRCLEQ_NEXT(mp, mnt_list);
848 vfs_unbusy(mp);
849 }
850 simple_unlock(&mountlist_slock);
851 if (root == 0 && p->p_cwdi->cwdi_rdir) {
852 /*
853 * fake a root entry
854 */
855 if ((error = dostatfs(p->p_cwdi->cwdi_rdir->v_mount, &sbuf, p,
856 SCARG(uap, flags), 1)) != 0)
857 return error;
858 if (sfsp)
859 error = copyout(&sbuf, sfsp, sizeof(sbuf));
860 count++;
861 }
862 if (sfsp && count > maxcount)
863 *retval = maxcount;
864 else
865 *retval = count;
866 return error;
867 }
868
869 /*
870 * Change current working directory to a given file descriptor.
871 */
872 /* ARGSUSED */
873 int
874 sys_fchdir(l, v, retval)
875 struct lwp *l;
876 void *v;
877 register_t *retval;
878 {
879 struct sys_fchdir_args /* {
880 syscallarg(int) fd;
881 } */ *uap = v;
882 struct proc *p = l->l_proc;
883 struct filedesc *fdp = p->p_fd;
884 struct cwdinfo *cwdi = p->p_cwdi;
885 struct vnode *vp, *tdp;
886 struct mount *mp;
887 struct file *fp;
888 int error;
889
890 /* getvnode() will use the descriptor for us */
891 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0)
892 return (error);
893 vp = (struct vnode *)fp->f_data;
894
895 VREF(vp);
896 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
897 if (vp->v_type != VDIR)
898 error = ENOTDIR;
899 else
900 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p);
901 while (!error && (mp = vp->v_mountedhere) != NULL) {
902 if (vfs_busy(mp, 0, 0))
903 continue;
904 error = VFS_ROOT(mp, &tdp);
905 vfs_unbusy(mp);
906 if (error)
907 break;
908 vput(vp);
909 vp = tdp;
910 }
911 if (error) {
912 vput(vp);
913 goto out;
914 }
915 VOP_UNLOCK(vp, 0);
916
917 /*
918 * Disallow changing to a directory not under the process's
919 * current root directory (if there is one).
920 */
921 if (cwdi->cwdi_rdir && !vn_isunder(vp, NULL, p)) {
922 vrele(vp);
923 error = EPERM; /* operation not permitted */
924 goto out;
925 }
926
927 vrele(cwdi->cwdi_cdir);
928 cwdi->cwdi_cdir = vp;
929 out:
930 FILE_UNUSE(fp, p);
931 return (error);
932 }
933
934 /*
935 * Change this process's notion of the root directory to a given file descriptor.
936 */
937
938 int
939 sys_fchroot(l, v, retval)
940 struct lwp *l;
941 void *v;
942 register_t *retval;
943 {
944 struct sys_fchroot_args *uap = v;
945 struct proc *p = l->l_proc;
946 struct filedesc *fdp = p->p_fd;
947 struct cwdinfo *cwdi = p->p_cwdi;
948 struct vnode *vp;
949 struct file *fp;
950 int error;
951
952 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
953 return error;
954 /* getvnode() will use the descriptor for us */
955 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0)
956 return error;
957 vp = (struct vnode *) fp->f_data;
958 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
959 if (vp->v_type != VDIR)
960 error = ENOTDIR;
961 else
962 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p);
963 VOP_UNLOCK(vp, 0);
964 if (error)
965 goto out;
966 VREF(vp);
967
968 /*
969 * Prevent escaping from chroot by putting the root under
970 * the working directory. Silently chdir to / if we aren't
971 * already there.
972 */
973 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) {
974 /*
975 * XXX would be more failsafe to change directory to a
976 * deadfs node here instead
977 */
978 vrele(cwdi->cwdi_cdir);
979 VREF(vp);
980 cwdi->cwdi_cdir = vp;
981 }
982
983 if (cwdi->cwdi_rdir != NULL)
984 vrele(cwdi->cwdi_rdir);
985 cwdi->cwdi_rdir = vp;
986 out:
987 FILE_UNUSE(fp, p);
988 return (error);
989 }
990
991
992
993 /*
994 * Change current working directory (``.'').
995 */
996 /* ARGSUSED */
997 int
998 sys_chdir(l, v, retval)
999 struct lwp *l;
1000 void *v;
1001 register_t *retval;
1002 {
1003 struct sys_chdir_args /* {
1004 syscallarg(const char *) path;
1005 } */ *uap = v;
1006 struct proc *p = l->l_proc;
1007 struct cwdinfo *cwdi = p->p_cwdi;
1008 int error;
1009 struct nameidata nd;
1010
1011 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
1012 SCARG(uap, path), p);
1013 if ((error = change_dir(&nd, p)) != 0)
1014 return (error);
1015 vrele(cwdi->cwdi_cdir);
1016 cwdi->cwdi_cdir = nd.ni_vp;
1017 return (0);
1018 }
1019
1020 /*
1021 * Change notion of root (``/'') directory.
1022 */
1023 /* ARGSUSED */
1024 int
1025 sys_chroot(l, v, retval)
1026 struct lwp *l;
1027 void *v;
1028 register_t *retval;
1029 {
1030 struct sys_chroot_args /* {
1031 syscallarg(const char *) path;
1032 } */ *uap = v;
1033 struct proc *p = l->l_proc;
1034 struct cwdinfo *cwdi = p->p_cwdi;
1035 struct vnode *vp;
1036 int error;
1037 struct nameidata nd;
1038
1039 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
1040 return (error);
1041 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
1042 SCARG(uap, path), p);
1043 if ((error = change_dir(&nd, p)) != 0)
1044 return (error);
1045 if (cwdi->cwdi_rdir != NULL)
1046 vrele(cwdi->cwdi_rdir);
1047 vp = nd.ni_vp;
1048 cwdi->cwdi_rdir = vp;
1049
1050 /*
1051 * Prevent escaping from chroot by putting the root under
1052 * the working directory. Silently chdir to / if we aren't
1053 * already there.
1054 */
1055 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) {
1056 /*
1057 * XXX would be more failsafe to change directory to a
1058 * deadfs node here instead
1059 */
1060 vrele(cwdi->cwdi_cdir);
1061 VREF(vp);
1062 cwdi->cwdi_cdir = vp;
1063 }
1064
1065 return (0);
1066 }
1067
1068 /*
1069 * Common routine for chroot and chdir.
1070 */
1071 static int
1072 change_dir(ndp, p)
1073 struct nameidata *ndp;
1074 struct proc *p;
1075 {
1076 struct vnode *vp;
1077 int error;
1078
1079 if ((error = namei(ndp)) != 0)
1080 return (error);
1081 vp = ndp->ni_vp;
1082 if (vp->v_type != VDIR)
1083 error = ENOTDIR;
1084 else
1085 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p);
1086
1087 if (error)
1088 vput(vp);
1089 else
1090 VOP_UNLOCK(vp, 0);
1091 return (error);
1092 }
1093
1094 /*
1095 * Check permissions, allocate an open file structure,
1096 * and call the device open routine if any.
1097 */
1098 int
1099 sys_open(l, v, retval)
1100 struct lwp *l;
1101 void *v;
1102 register_t *retval;
1103 {
1104 struct sys_open_args /* {
1105 syscallarg(const char *) path;
1106 syscallarg(int) flags;
1107 syscallarg(int) mode;
1108 } */ *uap = v;
1109 struct proc *p = l->l_proc;
1110 struct cwdinfo *cwdi = p->p_cwdi;
1111 struct filedesc *fdp = p->p_fd;
1112 struct file *fp;
1113 struct vnode *vp;
1114 int flags, cmode;
1115 int type, indx, error;
1116 struct flock lf;
1117 struct nameidata nd;
1118
1119 flags = FFLAGS(SCARG(uap, flags));
1120 if ((flags & (FREAD | FWRITE)) == 0)
1121 return (EINVAL);
1122 /* falloc() will use the file descriptor for us */
1123 if ((error = falloc(p, &fp, &indx)) != 0)
1124 return (error);
1125 cmode = ((SCARG(uap, mode) &~ cwdi->cwdi_cmask) & ALLPERMS) &~ S_ISTXT;
1126 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
1127 l->l_dupfd = -indx - 1; /* XXX check for fdopen */
1128 if ((error = vn_open(&nd, flags, cmode)) != 0) {
1129 FILE_UNUSE(fp, p);
1130 fdp->fd_ofiles[indx] = NULL;
1131 ffree(fp);
1132 if ((error == ENODEV || error == ENXIO) &&
1133 l->l_dupfd >= 0 && /* XXX from fdopen */
1134 (error =
1135 dupfdopen(p, indx, l->l_dupfd, flags, error)) == 0) {
1136 *retval = indx;
1137 return (0);
1138 }
1139 if (error == ERESTART)
1140 error = EINTR;
1141 fdremove(fdp, indx);
1142 return (error);
1143 }
1144 l->l_dupfd = 0;
1145 vp = nd.ni_vp;
1146 fp->f_flag = flags & FMASK;
1147 fp->f_type = DTYPE_VNODE;
1148 fp->f_ops = &vnops;
1149 fp->f_data = vp;
1150 if (flags & (O_EXLOCK | O_SHLOCK)) {
1151 lf.l_whence = SEEK_SET;
1152 lf.l_start = 0;
1153 lf.l_len = 0;
1154 if (flags & O_EXLOCK)
1155 lf.l_type = F_WRLCK;
1156 else
1157 lf.l_type = F_RDLCK;
1158 type = F_FLOCK;
1159 if ((flags & FNONBLOCK) == 0)
1160 type |= F_WAIT;
1161 VOP_UNLOCK(vp, 0);
1162 error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, type);
1163 if (error) {
1164 (void) vn_close(vp, fp->f_flag, fp->f_cred, p);
1165 FILE_UNUSE(fp, p);
1166 ffree(fp);
1167 fdremove(fdp, indx);
1168 return (error);
1169 }
1170 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1171 fp->f_flag |= FHASLOCK;
1172 }
1173 VOP_UNLOCK(vp, 0);
1174 *retval = indx;
1175 FILE_SET_MATURE(fp);
1176 FILE_UNUSE(fp, p);
1177 return (0);
1178 }
1179
1180 /*
1181 * Get file handle system call
1182 */
1183 int
1184 sys_getfh(l, v, retval)
1185 struct lwp *l;
1186 void *v;
1187 register_t *retval;
1188 {
1189 struct sys_getfh_args /* {
1190 syscallarg(char *) fname;
1191 syscallarg(fhandle_t *) fhp;
1192 } */ *uap = v;
1193 struct proc *p = l->l_proc;
1194 struct vnode *vp;
1195 fhandle_t fh;
1196 int error;
1197 struct nameidata nd;
1198
1199 /*
1200 * Must be super user
1201 */
1202 error = suser(p->p_ucred, &p->p_acflag);
1203 if (error)
1204 return (error);
1205 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
1206 SCARG(uap, fname), p);
1207 error = namei(&nd);
1208 if (error)
1209 return (error);
1210 vp = nd.ni_vp;
1211 memset(&fh, 0, sizeof(fh));
1212 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid;
1213 error = VFS_VPTOFH(vp, &fh.fh_fid);
1214 vput(vp);
1215 if (error)
1216 return (error);
1217 error = copyout(&fh, (caddr_t)SCARG(uap, fhp), sizeof (fh));
1218 return (error);
1219 }
1220
1221 /*
1222 * Open a file given a file handle.
1223 *
1224 * Check permissions, allocate an open file structure,
1225 * and call the device open routine if any.
1226 */
1227 int
1228 sys_fhopen(l, v, retval)
1229 struct lwp *l;
1230 void *v;
1231 register_t *retval;
1232 {
1233 struct sys_fhopen_args /* {
1234 syscallarg(const fhandle_t *) fhp;
1235 syscallarg(int) flags;
1236 } */ *uap = v;
1237 struct proc *p = l->l_proc;
1238 struct filedesc *fdp = p->p_fd;
1239 struct file *fp;
1240 struct vnode *vp = NULL;
1241 struct mount *mp;
1242 struct ucred *cred = p->p_ucred;
1243 int flags;
1244 struct file *nfp;
1245 int type, indx, error=0;
1246 struct flock lf;
1247 struct vattr va;
1248 fhandle_t fh;
1249
1250 /*
1251 * Must be super user
1252 */
1253 if ((error = suser(p->p_ucred, &p->p_acflag)))
1254 return (error);
1255
1256 flags = FFLAGS(SCARG(uap, flags));
1257 if ((flags & (FREAD | FWRITE)) == 0)
1258 return (EINVAL);
1259 if ((flags & O_CREAT))
1260 return (EINVAL);
1261 /* falloc() will use the file descriptor for us */
1262 if ((error = falloc(p, &nfp, &indx)) != 0)
1263 return (error);
1264 fp = nfp;
1265 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0)
1266 goto bad;
1267
1268 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) {
1269 error = ESTALE;
1270 goto bad;
1271 }
1272
1273 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)) != 0) {
1274 vp = NULL; /* most likely unnecessary sanity for bad: */
1275 goto bad;
1276 }
1277
1278 /* Now do an effective vn_open */
1279
1280 if (vp->v_type == VSOCK) {
1281 error = EOPNOTSUPP;
1282 goto bad;
1283 }
1284 if (flags & FREAD) {
1285 if ((error = VOP_ACCESS(vp, VREAD, cred, p)) != 0)
1286 goto bad;
1287 }
1288 if (flags & (FWRITE | O_TRUNC)) {
1289 if (vp->v_type == VDIR) {
1290 error = EISDIR;
1291 goto bad;
1292 }
1293 if ((error = vn_writechk(vp)) != 0 ||
1294 (error = VOP_ACCESS(vp, VWRITE, cred, p)) != 0)
1295 goto bad;
1296 }
1297 if (flags & O_TRUNC) {
1298 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0)
1299 goto bad;
1300 VOP_UNLOCK(vp, 0); /* XXX */
1301 VOP_LEASE(vp, p, cred, LEASE_WRITE);
1302 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */
1303 VATTR_NULL(&va);
1304 va.va_size = 0;
1305 error = VOP_SETATTR(vp, &va, cred, p);
1306 vn_finished_write(mp, 0);
1307 if (error)
1308 goto bad;
1309 }
1310 if ((error = VOP_OPEN(vp, flags, cred, p)) != 0)
1311 goto bad;
1312 if (vp->v_type == VREG &&
1313 uvn_attach(vp, flags & FWRITE ? VM_PROT_WRITE : 0) == NULL) {
1314 error = EIO;
1315 goto bad;
1316 }
1317 if (flags & FWRITE)
1318 vp->v_writecount++;
1319
1320 /* done with modified vn_open, now finish what sys_open does. */
1321
1322 fp->f_flag = flags & FMASK;
1323 fp->f_type = DTYPE_VNODE;
1324 fp->f_ops = &vnops;
1325 fp->f_data = vp;
1326 if (flags & (O_EXLOCK | O_SHLOCK)) {
1327 lf.l_whence = SEEK_SET;
1328 lf.l_start = 0;
1329 lf.l_len = 0;
1330 if (flags & O_EXLOCK)
1331 lf.l_type = F_WRLCK;
1332 else
1333 lf.l_type = F_RDLCK;
1334 type = F_FLOCK;
1335 if ((flags & FNONBLOCK) == 0)
1336 type |= F_WAIT;
1337 VOP_UNLOCK(vp, 0);
1338 error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, type);
1339 if (error) {
1340 (void) vn_close(vp, fp->f_flag, fp->f_cred, p);
1341 FILE_UNUSE(fp, p);
1342 ffree(fp);
1343 fdremove(fdp, indx);
1344 return (error);
1345 }
1346 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1347 fp->f_flag |= FHASLOCK;
1348 }
1349 VOP_UNLOCK(vp, 0);
1350 *retval = indx;
1351 FILE_SET_MATURE(fp);
1352 FILE_UNUSE(fp, p);
1353 return (0);
1354
1355 bad:
1356 FILE_UNUSE(fp, p);
1357 ffree(fp);
1358 fdremove(fdp, indx);
1359 if (vp != NULL)
1360 vput(vp);
1361 return (error);
1362 }
1363
1364 /* ARGSUSED */
1365 int
1366 sys_fhstat(l, v, retval)
1367 struct lwp *l;
1368 void *v;
1369 register_t *retval;
1370 {
1371 struct sys_fhstat_args /* {
1372 syscallarg(const fhandle_t *) fhp;
1373 syscallarg(struct stat *) sb;
1374 } */ *uap = v;
1375 struct proc *p = l->l_proc;
1376 struct stat sb;
1377 int error;
1378 fhandle_t fh;
1379 struct mount *mp;
1380 struct vnode *vp;
1381
1382 /*
1383 * Must be super user
1384 */
1385 if ((error = suser(p->p_ucred, &p->p_acflag)))
1386 return (error);
1387
1388 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0)
1389 return (error);
1390
1391 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL)
1392 return (ESTALE);
1393 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)))
1394 return (error);
1395 error = vn_stat(vp, &sb, p);
1396 vput(vp);
1397 if (error)
1398 return (error);
1399 error = copyout(&sb, SCARG(uap, sb), sizeof(sb));
1400 return (error);
1401 }
1402
1403 /* ARGSUSED */
1404 int
1405 sys_fhstatfs(l, v, retval)
1406 struct lwp *l;
1407 void *v;
1408 register_t *retval;
1409 {
1410 struct sys_fhstatfs_args /*
1411 syscallarg(const fhandle_t *) fhp;
1412 syscallarg(struct statfs *) buf;
1413 } */ *uap = v;
1414 struct proc *p = l->l_proc;
1415 struct statfs sbuf;
1416 fhandle_t fh;
1417 struct mount *mp;
1418 struct vnode *vp;
1419 int error;
1420
1421 /*
1422 * Must be super user
1423 */
1424 if ((error = suser(p->p_ucred, &p->p_acflag)))
1425 return (error);
1426
1427 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0)
1428 return (error);
1429
1430 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL)
1431 return (ESTALE);
1432 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)))
1433 return (error);
1434 mp = vp->v_mount;
1435 vput(vp);
1436 if ((error = VFS_STATFS(mp, &sbuf, p)) != 0)
1437 return (error);
1438 return (copyout(&sbuf, SCARG(uap, buf), sizeof(sbuf)));
1439 }
1440
1441 /*
1442 * Create a special file.
1443 */
1444 /* ARGSUSED */
1445 int
1446 sys_mknod(l, v, retval)
1447 struct lwp *l;
1448 void *v;
1449 register_t *retval;
1450 {
1451 struct sys_mknod_args /* {
1452 syscallarg(const char *) path;
1453 syscallarg(int) mode;
1454 syscallarg(int) dev;
1455 } */ *uap = v;
1456 struct proc *p = l->l_proc;
1457 struct vnode *vp;
1458 struct mount *mp;
1459 struct vattr vattr;
1460 int error;
1461 int whiteout = 0;
1462 struct nameidata nd;
1463
1464 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
1465 return (error);
1466 restart:
1467 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p);
1468 if ((error = namei(&nd)) != 0)
1469 return (error);
1470 vp = nd.ni_vp;
1471 if (vp != NULL)
1472 error = EEXIST;
1473 else {
1474 VATTR_NULL(&vattr);
1475 vattr.va_mode =
1476 (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask;
1477 vattr.va_rdev = SCARG(uap, dev);
1478 whiteout = 0;
1479
1480 switch (SCARG(uap, mode) & S_IFMT) {
1481 case S_IFMT: /* used by badsect to flag bad sectors */
1482 vattr.va_type = VBAD;
1483 break;
1484 case S_IFCHR:
1485 vattr.va_type = VCHR;
1486 break;
1487 case S_IFBLK:
1488 vattr.va_type = VBLK;
1489 break;
1490 case S_IFWHT:
1491 whiteout = 1;
1492 break;
1493 default:
1494 error = EINVAL;
1495 break;
1496 }
1497 }
1498 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1499 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
1500 if (nd.ni_dvp == vp)
1501 vrele(nd.ni_dvp);
1502 else
1503 vput(nd.ni_dvp);
1504 if (vp)
1505 vrele(vp);
1506 if ((error = vn_start_write(NULL, &mp,
1507 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0)
1508 return (error);
1509 goto restart;
1510 }
1511 if (!error) {
1512 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
1513 if (whiteout) {
1514 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE);
1515 if (error)
1516 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
1517 vput(nd.ni_dvp);
1518 } else {
1519 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp,
1520 &nd.ni_cnd, &vattr);
1521 if (error == 0)
1522 vput(nd.ni_vp);
1523 }
1524 } else {
1525 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
1526 if (nd.ni_dvp == vp)
1527 vrele(nd.ni_dvp);
1528 else
1529 vput(nd.ni_dvp);
1530 if (vp)
1531 vrele(vp);
1532 }
1533 vn_finished_write(mp, 0);
1534 return (error);
1535 }
1536
1537 /*
1538 * Create a named pipe.
1539 */
1540 /* ARGSUSED */
1541 int
1542 sys_mkfifo(l, v, retval)
1543 struct lwp *l;
1544 void *v;
1545 register_t *retval;
1546 {
1547 struct sys_mkfifo_args /* {
1548 syscallarg(const char *) path;
1549 syscallarg(int) mode;
1550 } */ *uap = v;
1551 struct proc *p = l->l_proc;
1552 struct mount *mp;
1553 struct vattr vattr;
1554 int error;
1555 struct nameidata nd;
1556
1557 restart:
1558 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p);
1559 if ((error = namei(&nd)) != 0)
1560 return (error);
1561 if (nd.ni_vp != NULL) {
1562 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
1563 if (nd.ni_dvp == nd.ni_vp)
1564 vrele(nd.ni_dvp);
1565 else
1566 vput(nd.ni_dvp);
1567 vrele(nd.ni_vp);
1568 return (EEXIST);
1569 }
1570 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1571 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
1572 if (nd.ni_dvp == nd.ni_vp)
1573 vrele(nd.ni_dvp);
1574 else
1575 vput(nd.ni_dvp);
1576 if (nd.ni_vp)
1577 vrele(nd.ni_vp);
1578 if ((error = vn_start_write(NULL, &mp,
1579 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0)
1580 return (error);
1581 goto restart;
1582 }
1583 VATTR_NULL(&vattr);
1584 vattr.va_type = VFIFO;
1585 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask;
1586 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
1587 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
1588 if (error == 0)
1589 vput(nd.ni_vp);
1590 vn_finished_write(mp, 0);
1591 return (error);
1592 }
1593
1594 /*
1595 * Make a hard file link.
1596 */
1597 /* ARGSUSED */
1598 int
1599 sys_link(l, v, retval)
1600 struct lwp *l;
1601 void *v;
1602 register_t *retval;
1603 {
1604 struct sys_link_args /* {
1605 syscallarg(const char *) path;
1606 syscallarg(const char *) link;
1607 } */ *uap = v;
1608 struct proc *p = l->l_proc;
1609 struct vnode *vp;
1610 struct mount *mp;
1611 struct nameidata nd;
1612 int error;
1613
1614 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
1615 if ((error = namei(&nd)) != 0)
1616 return (error);
1617 vp = nd.ni_vp;
1618 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) {
1619 vrele(vp);
1620 return (error);
1621 }
1622 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p);
1623 if ((error = namei(&nd)) != 0)
1624 goto out;
1625 if (nd.ni_vp) {
1626 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
1627 if (nd.ni_dvp == nd.ni_vp)
1628 vrele(nd.ni_dvp);
1629 else
1630 vput(nd.ni_dvp);
1631 vrele(nd.ni_vp);
1632 error = EEXIST;
1633 goto out;
1634 }
1635 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
1636 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
1637 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd);
1638 out:
1639 vrele(vp);
1640 vn_finished_write(mp, 0);
1641 return (error);
1642 }
1643
1644 /*
1645 * Make a symbolic link.
1646 */
1647 /* ARGSUSED */
1648 int
1649 sys_symlink(l, v, retval)
1650 struct lwp *l;
1651 void *v;
1652 register_t *retval;
1653 {
1654 struct sys_symlink_args /* {
1655 syscallarg(const char *) path;
1656 syscallarg(const char *) link;
1657 } */ *uap = v;
1658 struct proc *p = l->l_proc;
1659 struct mount *mp;
1660 struct vattr vattr;
1661 char *path;
1662 int error;
1663 struct nameidata nd;
1664
1665 path = PNBUF_GET();
1666 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL);
1667 if (error)
1668 goto out;
1669 restart:
1670 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p);
1671 if ((error = namei(&nd)) != 0)
1672 goto out;
1673 if (nd.ni_vp) {
1674 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
1675 if (nd.ni_dvp == nd.ni_vp)
1676 vrele(nd.ni_dvp);
1677 else
1678 vput(nd.ni_dvp);
1679 vrele(nd.ni_vp);
1680 error = EEXIST;
1681 goto out;
1682 }
1683 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1684 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
1685 if (nd.ni_dvp == nd.ni_vp)
1686 vrele(nd.ni_dvp);
1687 else
1688 vput(nd.ni_dvp);
1689 if ((error = vn_start_write(NULL, &mp,
1690 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0)
1691 return (error);
1692 goto restart;
1693 }
1694 VATTR_NULL(&vattr);
1695 vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask;
1696 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
1697 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path);
1698 if (error == 0)
1699 vput(nd.ni_vp);
1700 vn_finished_write(mp, 0);
1701 out:
1702 PNBUF_PUT(path);
1703 return (error);
1704 }
1705
1706 /*
1707 * Delete a whiteout from the filesystem.
1708 */
1709 /* ARGSUSED */
1710 int
1711 sys_undelete(l, v, retval)
1712 struct lwp *l;
1713 void *v;
1714 register_t *retval;
1715 {
1716 struct sys_undelete_args /* {
1717 syscallarg(const char *) path;
1718 } */ *uap = v;
1719 struct proc *p = l->l_proc;
1720 int error;
1721 struct mount *mp;
1722 struct nameidata nd;
1723
1724 restart:
1725 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE,
1726 SCARG(uap, path), p);
1727 error = namei(&nd);
1728 if (error)
1729 return (error);
1730
1731 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) {
1732 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
1733 if (nd.ni_dvp == nd.ni_vp)
1734 vrele(nd.ni_dvp);
1735 else
1736 vput(nd.ni_dvp);
1737 if (nd.ni_vp)
1738 vrele(nd.ni_vp);
1739 return (EEXIST);
1740 }
1741 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1742 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
1743 if (nd.ni_dvp == nd.ni_vp)
1744 vrele(nd.ni_dvp);
1745 else
1746 vput(nd.ni_dvp);
1747 if ((error = vn_start_write(NULL, &mp,
1748 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0)
1749 return (error);
1750 goto restart;
1751 }
1752 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
1753 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0)
1754 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
1755 vput(nd.ni_dvp);
1756 vn_finished_write(mp, 0);
1757 return (error);
1758 }
1759
1760 /*
1761 * Delete a name from the filesystem.
1762 */
1763 /* ARGSUSED */
1764 int
1765 sys_unlink(l, v, retval)
1766 struct lwp *l;
1767 void *v;
1768 register_t *retval;
1769 {
1770 struct sys_unlink_args /* {
1771 syscallarg(const char *) path;
1772 } */ *uap = v;
1773 struct proc *p = l->l_proc;
1774 struct mount *mp;
1775 struct vnode *vp;
1776 int error;
1777 struct nameidata nd;
1778
1779 restart:
1780 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE,
1781 SCARG(uap, path), p);
1782 if ((error = namei(&nd)) != 0)
1783 return (error);
1784 vp = nd.ni_vp;
1785
1786 /*
1787 * The root of a mounted filesystem cannot be deleted.
1788 */
1789 if (vp->v_flag & VROOT) {
1790 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
1791 if (nd.ni_dvp == vp)
1792 vrele(nd.ni_dvp);
1793 else
1794 vput(nd.ni_dvp);
1795 vput(vp);
1796 error = EBUSY;
1797 goto out;
1798 }
1799 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1800 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
1801 if (nd.ni_dvp == vp)
1802 vrele(nd.ni_dvp);
1803 else
1804 vput(nd.ni_dvp);
1805 vput(vp);
1806 if ((error = vn_start_write(NULL, &mp,
1807 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0)
1808 return (error);
1809 goto restart;
1810 }
1811 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
1812 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
1813 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd);
1814 vn_finished_write(mp, 0);
1815 out:
1816 return (error);
1817 }
1818
1819 /*
1820 * Reposition read/write file offset.
1821 */
1822 int
1823 sys_lseek(l, v, retval)
1824 struct lwp *l;
1825 void *v;
1826 register_t *retval;
1827 {
1828 struct sys_lseek_args /* {
1829 syscallarg(int) fd;
1830 syscallarg(int) pad;
1831 syscallarg(off_t) offset;
1832 syscallarg(int) whence;
1833 } */ *uap = v;
1834 struct proc *p = l->l_proc;
1835 struct ucred *cred = p->p_ucred;
1836 struct filedesc *fdp = p->p_fd;
1837 struct file *fp;
1838 struct vnode *vp;
1839 struct vattr vattr;
1840 off_t newoff;
1841 int error;
1842
1843 if ((fp = fd_getfile(fdp, SCARG(uap, fd))) == NULL)
1844 return (EBADF);
1845
1846 FILE_USE(fp);
1847
1848 vp = (struct vnode *)fp->f_data;
1849 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) {
1850 error = ESPIPE;
1851 goto out;
1852 }
1853
1854 switch (SCARG(uap, whence)) {
1855 case SEEK_CUR:
1856 newoff = fp->f_offset + SCARG(uap, offset);
1857 break;
1858 case SEEK_END:
1859 error = VOP_GETATTR(vp, &vattr, cred, p);
1860 if (error)
1861 goto out;
1862 newoff = SCARG(uap, offset) + vattr.va_size;
1863 break;
1864 case SEEK_SET:
1865 newoff = SCARG(uap, offset);
1866 break;
1867 default:
1868 error = EINVAL;
1869 goto out;
1870 }
1871 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0)
1872 goto out;
1873
1874 *(off_t *)retval = fp->f_offset = newoff;
1875 out:
1876 FILE_UNUSE(fp, p);
1877 return (error);
1878 }
1879
1880 /*
1881 * Positional read system call.
1882 */
1883 int
1884 sys_pread(l, v, retval)
1885 struct lwp *l;
1886 void *v;
1887 register_t *retval;
1888 {
1889 struct sys_pread_args /* {
1890 syscallarg(int) fd;
1891 syscallarg(void *) buf;
1892 syscallarg(size_t) nbyte;
1893 syscallarg(off_t) offset;
1894 } */ *uap = v;
1895 struct proc *p = l->l_proc;
1896 struct filedesc *fdp = p->p_fd;
1897 struct file *fp;
1898 struct vnode *vp;
1899 off_t offset;
1900 int error, fd = SCARG(uap, fd);
1901
1902 if ((fp = fd_getfile(fdp, fd)) == NULL)
1903 return (EBADF);
1904
1905 if ((fp->f_flag & FREAD) == 0) {
1906 simple_unlock(&fp->f_slock);
1907 return (EBADF);
1908 }
1909
1910 FILE_USE(fp);
1911
1912 vp = (struct vnode *)fp->f_data;
1913 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) {
1914 error = ESPIPE;
1915 goto out;
1916 }
1917
1918 offset = SCARG(uap, offset);
1919
1920 /*
1921 * XXX This works because no file systems actually
1922 * XXX take any action on the seek operation.
1923 */
1924 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0)
1925 goto out;
1926
1927 /* dofileread() will unuse the descriptor for us */
1928 return (dofileread(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte),
1929 &offset, 0, retval));
1930
1931 out:
1932 FILE_UNUSE(fp, p);
1933 return (error);
1934 }
1935
1936 /*
1937 * Positional scatter read system call.
1938 */
1939 int
1940 sys_preadv(l, v, retval)
1941 struct lwp *l;
1942 void *v;
1943 register_t *retval;
1944 {
1945 struct sys_preadv_args /* {
1946 syscallarg(int) fd;
1947 syscallarg(const struct iovec *) iovp;
1948 syscallarg(int) iovcnt;
1949 syscallarg(off_t) offset;
1950 } */ *uap = v;
1951 struct proc *p = l->l_proc;
1952 struct filedesc *fdp = p->p_fd;
1953 struct file *fp;
1954 struct vnode *vp;
1955 off_t offset;
1956 int error, fd = SCARG(uap, fd);
1957
1958 if ((fp = fd_getfile(fdp, fd)) == NULL)
1959 return (EBADF);
1960
1961 if ((fp->f_flag & FREAD) == 0) {
1962 simple_unlock(&fp->f_slock);
1963 return (EBADF);
1964 }
1965
1966 FILE_USE(fp);
1967
1968 vp = (struct vnode *)fp->f_data;
1969 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) {
1970 error = ESPIPE;
1971 goto out;
1972 }
1973
1974 offset = SCARG(uap, offset);
1975
1976 /*
1977 * XXX This works because no file systems actually
1978 * XXX take any action on the seek operation.
1979 */
1980 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0)
1981 goto out;
1982
1983 /* dofilereadv() will unuse the descriptor for us */
1984 return (dofilereadv(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt),
1985 &offset, 0, retval));
1986
1987 out:
1988 FILE_UNUSE(fp, p);
1989 return (error);
1990 }
1991
1992 /*
1993 * Positional write system call.
1994 */
1995 int
1996 sys_pwrite(l, v, retval)
1997 struct lwp *l;
1998 void *v;
1999 register_t *retval;
2000 {
2001 struct sys_pwrite_args /* {
2002 syscallarg(int) fd;
2003 syscallarg(const void *) buf;
2004 syscallarg(size_t) nbyte;
2005 syscallarg(off_t) offset;
2006 } */ *uap = v;
2007 struct proc *p = l->l_proc;
2008 struct filedesc *fdp = p->p_fd;
2009 struct file *fp;
2010 struct vnode *vp;
2011 off_t offset;
2012 int error, fd = SCARG(uap, fd);
2013
2014 if ((fp = fd_getfile(fdp, fd)) == NULL)
2015 return (EBADF);
2016
2017 if ((fp->f_flag & FWRITE) == 0) {
2018 simple_unlock(&fp->f_slock);
2019 return (EBADF);
2020 }
2021
2022 FILE_USE(fp);
2023
2024 vp = (struct vnode *)fp->f_data;
2025 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) {
2026 error = ESPIPE;
2027 goto out;
2028 }
2029
2030 offset = SCARG(uap, offset);
2031
2032 /*
2033 * XXX This works because no file systems actually
2034 * XXX take any action on the seek operation.
2035 */
2036 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0)
2037 goto out;
2038
2039 /* dofilewrite() will unuse the descriptor for us */
2040 return (dofilewrite(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte),
2041 &offset, 0, retval));
2042
2043 out:
2044 FILE_UNUSE(fp, p);
2045 return (error);
2046 }
2047
2048 /*
2049 * Positional gather write system call.
2050 */
2051 int
2052 sys_pwritev(l, v, retval)
2053 struct lwp *l;
2054 void *v;
2055 register_t *retval;
2056 {
2057 struct sys_pwritev_args /* {
2058 syscallarg(int) fd;
2059 syscallarg(const struct iovec *) iovp;
2060 syscallarg(int) iovcnt;
2061 syscallarg(off_t) offset;
2062 } */ *uap = v;
2063 struct proc *p = l->l_proc;
2064 struct filedesc *fdp = p->p_fd;
2065 struct file *fp;
2066 struct vnode *vp;
2067 off_t offset;
2068 int error, fd = SCARG(uap, fd);
2069
2070 if ((fp = fd_getfile(fdp, fd)) == NULL)
2071 return (EBADF);
2072
2073 if ((fp->f_flag & FWRITE) == 0) {
2074 simple_unlock(&fp->f_slock);
2075 return (EBADF);
2076 }
2077
2078 FILE_USE(fp);
2079
2080 vp = (struct vnode *)fp->f_data;
2081 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) {
2082 error = ESPIPE;
2083 goto out;
2084 }
2085
2086 offset = SCARG(uap, offset);
2087
2088 /*
2089 * XXX This works because no file systems actually
2090 * XXX take any action on the seek operation.
2091 */
2092 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0)
2093 goto out;
2094
2095 /* dofilewritev() will unuse the descriptor for us */
2096 return (dofilewritev(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt),
2097 &offset, 0, retval));
2098
2099 out:
2100 FILE_UNUSE(fp, p);
2101 return (error);
2102 }
2103
2104 /*
2105 * Check access permissions.
2106 */
2107 int
2108 sys_access(l, v, retval)
2109 struct lwp *l;
2110 void *v;
2111 register_t *retval;
2112 {
2113 struct sys_access_args /* {
2114 syscallarg(const char *) path;
2115 syscallarg(int) flags;
2116 } */ *uap = v;
2117 struct proc *p = l->l_proc;
2118 struct ucred *cred = crget();
2119 struct vnode *vp;
2120 int error, flags;
2121 struct nameidata nd;
2122
2123 (void)memcpy(cred, p->p_ucred, sizeof(*cred));
2124 cred->cr_ref = 1;
2125 cred->cr_uid = p->p_cred->p_ruid;
2126 cred->cr_gid = p->p_cred->p_rgid;
2127 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
2128 SCARG(uap, path), p);
2129 /* Override default credentials */
2130 nd.ni_cnd.cn_cred = cred;
2131 if ((error = namei(&nd)) != 0)
2132 goto out;
2133 vp = nd.ni_vp;
2134
2135 /* Flags == 0 means only check for existence. */
2136 if (SCARG(uap, flags)) {
2137 flags = 0;
2138 if (SCARG(uap, flags) & R_OK)
2139 flags |= VREAD;
2140 if (SCARG(uap, flags) & W_OK)
2141 flags |= VWRITE;
2142 if (SCARG(uap, flags) & X_OK)
2143 flags |= VEXEC;
2144
2145 error = VOP_ACCESS(vp, flags, cred, p);
2146 if (!error && (flags & VWRITE))
2147 error = vn_writechk(vp);
2148 }
2149 vput(vp);
2150 out:
2151 crfree(cred);
2152 return (error);
2153 }
2154
2155 /*
2156 * Get file status; this version follows links.
2157 */
2158 /* ARGSUSED */
2159 int
2160 sys___stat13(l, v, retval)
2161 struct lwp *l;
2162 void *v;
2163 register_t *retval;
2164 {
2165 struct sys___stat13_args /* {
2166 syscallarg(const char *) path;
2167 syscallarg(struct stat *) ub;
2168 } */ *uap = v;
2169 struct proc *p = l->l_proc;
2170 struct stat sb;
2171 int error;
2172 struct nameidata nd;
2173
2174 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
2175 SCARG(uap, path), p);
2176 if ((error = namei(&nd)) != 0)
2177 return (error);
2178 error = vn_stat(nd.ni_vp, &sb, p);
2179 vput(nd.ni_vp);
2180 if (error)
2181 return (error);
2182 error = copyout(&sb, SCARG(uap, ub), sizeof(sb));
2183 return (error);
2184 }
2185
2186 /*
2187 * Get file status; this version does not follow links.
2188 */
2189 /* ARGSUSED */
2190 int
2191 sys___lstat13(l, v, retval)
2192 struct lwp *l;
2193 void *v;
2194 register_t *retval;
2195 {
2196 struct sys___lstat13_args /* {
2197 syscallarg(const char *) path;
2198 syscallarg(struct stat *) ub;
2199 } */ *uap = v;
2200 struct proc *p = l->l_proc;
2201 struct stat sb;
2202 int error;
2203 struct nameidata nd;
2204
2205 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE,
2206 SCARG(uap, path), p);
2207 if ((error = namei(&nd)) != 0)
2208 return (error);
2209 error = vn_stat(nd.ni_vp, &sb, p);
2210 vput(nd.ni_vp);
2211 if (error)
2212 return (error);
2213 error = copyout(&sb, SCARG(uap, ub), sizeof(sb));
2214 return (error);
2215 }
2216
2217 /*
2218 * Get configurable pathname variables.
2219 */
2220 /* ARGSUSED */
2221 int
2222 sys_pathconf(l, v, retval)
2223 struct lwp *l;
2224 void *v;
2225 register_t *retval;
2226 {
2227 struct sys_pathconf_args /* {
2228 syscallarg(const char *) path;
2229 syscallarg(int) name;
2230 } */ *uap = v;
2231 struct proc *p = l->l_proc;
2232 int error;
2233 struct nameidata nd;
2234
2235 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
2236 SCARG(uap, path), p);
2237 if ((error = namei(&nd)) != 0)
2238 return (error);
2239 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval);
2240 vput(nd.ni_vp);
2241 return (error);
2242 }
2243
2244 /*
2245 * Return target name of a symbolic link.
2246 */
2247 /* ARGSUSED */
2248 int
2249 sys_readlink(l, v, retval)
2250 struct lwp *l;
2251 void *v;
2252 register_t *retval;
2253 {
2254 struct sys_readlink_args /* {
2255 syscallarg(const char *) path;
2256 syscallarg(char *) buf;
2257 syscallarg(size_t) count;
2258 } */ *uap = v;
2259 struct proc *p = l->l_proc;
2260 struct vnode *vp;
2261 struct iovec aiov;
2262 struct uio auio;
2263 int error;
2264 struct nameidata nd;
2265
2266 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE,
2267 SCARG(uap, path), p);
2268 if ((error = namei(&nd)) != 0)
2269 return (error);
2270 vp = nd.ni_vp;
2271 if (vp->v_type != VLNK)
2272 error = EINVAL;
2273 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) ||
2274 (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) {
2275 aiov.iov_base = SCARG(uap, buf);
2276 aiov.iov_len = SCARG(uap, count);
2277 auio.uio_iov = &aiov;
2278 auio.uio_iovcnt = 1;
2279 auio.uio_offset = 0;
2280 auio.uio_rw = UIO_READ;
2281 auio.uio_segflg = UIO_USERSPACE;
2282 auio.uio_procp = p;
2283 auio.uio_resid = SCARG(uap, count);
2284 error = VOP_READLINK(vp, &auio, p->p_ucred);
2285 }
2286 vput(vp);
2287 *retval = SCARG(uap, count) - auio.uio_resid;
2288 return (error);
2289 }
2290
2291 /*
2292 * Change flags of a file given a path name.
2293 */
2294 /* ARGSUSED */
2295 int
2296 sys_chflags(l, v, retval)
2297 struct lwp *l;
2298 void *v;
2299 register_t *retval;
2300 {
2301 struct sys_chflags_args /* {
2302 syscallarg(const char *) path;
2303 syscallarg(u_long) flags;
2304 } */ *uap = v;
2305 struct proc *p = l->l_proc;
2306 struct vnode *vp;
2307 int error;
2308 struct nameidata nd;
2309
2310 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
2311 if ((error = namei(&nd)) != 0)
2312 return (error);
2313 vp = nd.ni_vp;
2314 error = change_flags(vp, SCARG(uap, flags), p);
2315 vput(vp);
2316 return (error);
2317 }
2318
2319 /*
2320 * Change flags of a file given a file descriptor.
2321 */
2322 /* ARGSUSED */
2323 int
2324 sys_fchflags(l, v, retval)
2325 struct lwp *l;
2326 void *v;
2327 register_t *retval;
2328 {
2329 struct sys_fchflags_args /* {
2330 syscallarg(int) fd;
2331 syscallarg(u_long) flags;
2332 } */ *uap = v;
2333 struct proc *p = l->l_proc;
2334 struct vnode *vp;
2335 struct file *fp;
2336 int error;
2337
2338 /* getvnode() will use the descriptor for us */
2339 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
2340 return (error);
2341 vp = (struct vnode *)fp->f_data;
2342 error = change_flags(vp, SCARG(uap, flags), p);
2343 VOP_UNLOCK(vp, 0);
2344 FILE_UNUSE(fp, p);
2345 return (error);
2346 }
2347
2348 /*
2349 * Change flags of a file given a path name; this version does
2350 * not follow links.
2351 */
2352 int
2353 sys_lchflags(l, v, retval)
2354 struct lwp *l;
2355 void *v;
2356 register_t *retval;
2357 {
2358 struct sys_lchflags_args /* {
2359 syscallarg(const char *) path;
2360 syscallarg(u_long) flags;
2361 } */ *uap = v;
2362 struct proc *p = l->l_proc;
2363 struct vnode *vp;
2364 int error;
2365 struct nameidata nd;
2366
2367 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
2368 if ((error = namei(&nd)) != 0)
2369 return (error);
2370 vp = nd.ni_vp;
2371 error = change_flags(vp, SCARG(uap, flags), p);
2372 vput(vp);
2373 return (error);
2374 }
2375
2376 /*
2377 * Common routine to change flags of a file.
2378 */
2379 int
2380 change_flags(vp, flags, p)
2381 struct vnode *vp;
2382 u_long flags;
2383 struct proc *p;
2384 {
2385 struct mount *mp;
2386 struct vattr vattr;
2387 int error;
2388
2389 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0)
2390 return (error);
2391 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
2392 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
2393 /*
2394 * Non-superusers cannot change the flags on devices, even if they
2395 * own them.
2396 */
2397 if (suser(p->p_ucred, &p->p_acflag) != 0) {
2398 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0)
2399 goto out;
2400 if (vattr.va_type == VCHR || vattr.va_type == VBLK) {
2401 error = EINVAL;
2402 goto out;
2403 }
2404 }
2405 VATTR_NULL(&vattr);
2406 vattr.va_flags = flags;
2407 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
2408 out:
2409 vn_finished_write(mp, 0);
2410 return (error);
2411 }
2412
2413 /*
2414 * Change mode of a file given path name; this version follows links.
2415 */
2416 /* ARGSUSED */
2417 int
2418 sys_chmod(l, v, retval)
2419 struct lwp *l;
2420 void *v;
2421 register_t *retval;
2422 {
2423 struct sys_chmod_args /* {
2424 syscallarg(const char *) path;
2425 syscallarg(int) mode;
2426 } */ *uap = v;
2427 struct proc *p = l->l_proc;
2428 int error;
2429 struct nameidata nd;
2430
2431 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
2432 if ((error = namei(&nd)) != 0)
2433 return (error);
2434
2435 error = change_mode(nd.ni_vp, SCARG(uap, mode), p);
2436
2437 vrele(nd.ni_vp);
2438 return (error);
2439 }
2440
2441 /*
2442 * Change mode of a file given a file descriptor.
2443 */
2444 /* ARGSUSED */
2445 int
2446 sys_fchmod(l, v, retval)
2447 struct lwp *l;
2448 void *v;
2449 register_t *retval;
2450 {
2451 struct sys_fchmod_args /* {
2452 syscallarg(int) fd;
2453 syscallarg(int) mode;
2454 } */ *uap = v;
2455 struct proc *p = l->l_proc;
2456 struct file *fp;
2457 int error;
2458
2459 /* getvnode() will use the descriptor for us */
2460 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
2461 return (error);
2462
2463 error = change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p);
2464 FILE_UNUSE(fp, p);
2465 return (error);
2466 }
2467
2468 /*
2469 * Change mode of a file given path name; this version does not follow links.
2470 */
2471 /* ARGSUSED */
2472 int
2473 sys_lchmod(l, v, retval)
2474 struct lwp *l;
2475 void *v;
2476 register_t *retval;
2477 {
2478 struct sys_lchmod_args /* {
2479 syscallarg(const char *) path;
2480 syscallarg(int) mode;
2481 } */ *uap = v;
2482 struct proc *p = l->l_proc;
2483 int error;
2484 struct nameidata nd;
2485
2486 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
2487 if ((error = namei(&nd)) != 0)
2488 return (error);
2489
2490 error = change_mode(nd.ni_vp, SCARG(uap, mode), p);
2491
2492 vrele(nd.ni_vp);
2493 return (error);
2494 }
2495
2496 /*
2497 * Common routine to set mode given a vnode.
2498 */
2499 static int
2500 change_mode(vp, mode, p)
2501 struct vnode *vp;
2502 int mode;
2503 struct proc *p;
2504 {
2505 struct mount *mp;
2506 struct vattr vattr;
2507 int error;
2508
2509 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0)
2510 return (error);
2511 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
2512 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
2513 VATTR_NULL(&vattr);
2514 vattr.va_mode = mode & ALLPERMS;
2515 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
2516 VOP_UNLOCK(vp, 0);
2517 vn_finished_write(mp, 0);
2518 return (error);
2519 }
2520
2521 /*
2522 * Set ownership given a path name; this version follows links.
2523 */
2524 /* ARGSUSED */
2525 int
2526 sys_chown(l, v, retval)
2527 struct lwp *l;
2528 void *v;
2529 register_t *retval;
2530 {
2531 struct sys_chown_args /* {
2532 syscallarg(const char *) path;
2533 syscallarg(uid_t) uid;
2534 syscallarg(gid_t) gid;
2535 } */ *uap = v;
2536 struct proc *p = l->l_proc;
2537 int error;
2538 struct nameidata nd;
2539
2540 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
2541 if ((error = namei(&nd)) != 0)
2542 return (error);
2543
2544 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0);
2545
2546 vrele(nd.ni_vp);
2547 return (error);
2548 }
2549
2550 /*
2551 * Set ownership given a path name; this version follows links.
2552 * Provides POSIX semantics.
2553 */
2554 /* ARGSUSED */
2555 int
2556 sys___posix_chown(l, v, retval)
2557 struct lwp *l;
2558 void *v;
2559 register_t *retval;
2560 {
2561 struct sys_chown_args /* {
2562 syscallarg(const char *) path;
2563 syscallarg(uid_t) uid;
2564 syscallarg(gid_t) gid;
2565 } */ *uap = v;
2566 struct proc *p = l->l_proc;
2567 int error;
2568 struct nameidata nd;
2569
2570 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
2571 if ((error = namei(&nd)) != 0)
2572 return (error);
2573
2574 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1);
2575
2576 vrele(nd.ni_vp);
2577 return (error);
2578 }
2579
2580 /*
2581 * Set ownership given a file descriptor.
2582 */
2583 /* ARGSUSED */
2584 int
2585 sys_fchown(l, v, retval)
2586 struct lwp *l;
2587 void *v;
2588 register_t *retval;
2589 {
2590 struct sys_fchown_args /* {
2591 syscallarg(int) fd;
2592 syscallarg(uid_t) uid;
2593 syscallarg(gid_t) gid;
2594 } */ *uap = v;
2595 struct proc *p = l->l_proc;
2596 int error;
2597 struct file *fp;
2598
2599 /* getvnode() will use the descriptor for us */
2600 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
2601 return (error);
2602
2603 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid),
2604 SCARG(uap, gid), p, 0);
2605 FILE_UNUSE(fp, p);
2606 return (error);
2607 }
2608
2609 /*
2610 * Set ownership given a file descriptor, providing POSIX/XPG semantics.
2611 */
2612 /* ARGSUSED */
2613 int
2614 sys___posix_fchown(l, v, retval)
2615 struct lwp *l;
2616 void *v;
2617 register_t *retval;
2618 {
2619 struct sys_fchown_args /* {
2620 syscallarg(int) fd;
2621 syscallarg(uid_t) uid;
2622 syscallarg(gid_t) gid;
2623 } */ *uap = v;
2624 struct proc *p = l->l_proc;
2625 int error;
2626 struct file *fp;
2627
2628 /* getvnode() will use the descriptor for us */
2629 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
2630 return (error);
2631
2632 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid),
2633 SCARG(uap, gid), p, 1);
2634 FILE_UNUSE(fp, p);
2635 return (error);
2636 }
2637
2638 /*
2639 * Set ownership given a path name; this version does not follow links.
2640 */
2641 /* ARGSUSED */
2642 int
2643 sys_lchown(l, v, retval)
2644 struct lwp *l;
2645 void *v;
2646 register_t *retval;
2647 {
2648 struct sys_lchown_args /* {
2649 syscallarg(const char *) path;
2650 syscallarg(uid_t) uid;
2651 syscallarg(gid_t) gid;
2652 } */ *uap = v;
2653 struct proc *p = l->l_proc;
2654 int error;
2655 struct nameidata nd;
2656
2657 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
2658 if ((error = namei(&nd)) != 0)
2659 return (error);
2660
2661 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0);
2662
2663 vrele(nd.ni_vp);
2664 return (error);
2665 }
2666
2667 /*
2668 * Set ownership given a path name; this version does not follow links.
2669 * Provides POSIX/XPG semantics.
2670 */
2671 /* ARGSUSED */
2672 int
2673 sys___posix_lchown(l, v, retval)
2674 struct lwp *l;
2675 void *v;
2676 register_t *retval;
2677 {
2678 struct sys_lchown_args /* {
2679 syscallarg(const char *) path;
2680 syscallarg(uid_t) uid;
2681 syscallarg(gid_t) gid;
2682 } */ *uap = v;
2683 struct proc *p = l->l_proc;
2684 int error;
2685 struct nameidata nd;
2686
2687 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
2688 if ((error = namei(&nd)) != 0)
2689 return (error);
2690
2691 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1);
2692
2693 vrele(nd.ni_vp);
2694 return (error);
2695 }
2696
2697 /*
2698 * Common routine to set ownership given a vnode.
2699 */
2700 static int
2701 change_owner(vp, uid, gid, p, posix_semantics)
2702 struct vnode *vp;
2703 uid_t uid;
2704 gid_t gid;
2705 struct proc *p;
2706 int posix_semantics;
2707 {
2708 struct mount *mp;
2709 struct vattr vattr;
2710 mode_t newmode;
2711 int error;
2712
2713 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0)
2714 return (error);
2715 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
2716 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
2717 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0)
2718 goto out;
2719
2720 #define CHANGED(x) ((int)(x) != -1)
2721 newmode = vattr.va_mode;
2722 if (posix_semantics) {
2723 /*
2724 * POSIX/XPG semantics: if the caller is not the super-user,
2725 * clear set-user-id and set-group-id bits. Both POSIX and
2726 * the XPG consider the behaviour for calls by the super-user
2727 * implementation-defined; we leave the set-user-id and set-
2728 * group-id settings intact in that case.
2729 */
2730 if (suser(p->p_ucred, NULL) != 0)
2731 newmode &= ~(S_ISUID | S_ISGID);
2732 } else {
2733 /*
2734 * NetBSD semantics: when changing owner and/or group,
2735 * clear the respective bit(s).
2736 */
2737 if (CHANGED(uid))
2738 newmode &= ~S_ISUID;
2739 if (CHANGED(gid))
2740 newmode &= ~S_ISGID;
2741 }
2742 /* Update va_mode iff altered. */
2743 if (vattr.va_mode == newmode)
2744 newmode = VNOVAL;
2745
2746 VATTR_NULL(&vattr);
2747 vattr.va_uid = CHANGED(uid) ? uid : (uid_t)VNOVAL;
2748 vattr.va_gid = CHANGED(gid) ? gid : (gid_t)VNOVAL;
2749 vattr.va_mode = newmode;
2750 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
2751 #undef CHANGED
2752
2753 out:
2754 VOP_UNLOCK(vp, 0);
2755 vn_finished_write(mp, 0);
2756 return (error);
2757 }
2758
2759 /*
2760 * Set the access and modification times given a path name; this
2761 * version follows links.
2762 */
2763 /* ARGSUSED */
2764 int
2765 sys_utimes(l, v, retval)
2766 struct lwp *l;
2767 void *v;
2768 register_t *retval;
2769 {
2770 struct sys_utimes_args /* {
2771 syscallarg(const char *) path;
2772 syscallarg(const struct timeval *) tptr;
2773 } */ *uap = v;
2774 struct proc *p = l->l_proc;
2775 int error;
2776 struct nameidata nd;
2777
2778 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
2779 if ((error = namei(&nd)) != 0)
2780 return (error);
2781
2782 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p);
2783
2784 vrele(nd.ni_vp);
2785 return (error);
2786 }
2787
2788 /*
2789 * Set the access and modification times given a file descriptor.
2790 */
2791 /* ARGSUSED */
2792 int
2793 sys_futimes(l, v, retval)
2794 struct lwp *l;
2795 void *v;
2796 register_t *retval;
2797 {
2798 struct sys_futimes_args /* {
2799 syscallarg(int) fd;
2800 syscallarg(const struct timeval *) tptr;
2801 } */ *uap = v;
2802 struct proc *p = l->l_proc;
2803 int error;
2804 struct file *fp;
2805
2806 /* getvnode() will use the descriptor for us */
2807 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
2808 return (error);
2809
2810 error = change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), p);
2811 FILE_UNUSE(fp, p);
2812 return (error);
2813 }
2814
2815 /*
2816 * Set the access and modification times given a path name; this
2817 * version does not follow links.
2818 */
2819 /* ARGSUSED */
2820 int
2821 sys_lutimes(l, v, retval)
2822 struct lwp *l;
2823 void *v;
2824 register_t *retval;
2825 {
2826 struct sys_lutimes_args /* {
2827 syscallarg(const char *) path;
2828 syscallarg(const struct timeval *) tptr;
2829 } */ *uap = v;
2830 struct proc *p = l->l_proc;
2831 int error;
2832 struct nameidata nd;
2833
2834 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
2835 if ((error = namei(&nd)) != 0)
2836 return (error);
2837
2838 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p);
2839
2840 vrele(nd.ni_vp);
2841 return (error);
2842 }
2843
2844 /*
2845 * Common routine to set access and modification times given a vnode.
2846 */
2847 static int
2848 change_utimes(vp, tptr, p)
2849 struct vnode *vp;
2850 const struct timeval *tptr;
2851 struct proc *p;
2852 {
2853 struct timeval tv[2];
2854 struct mount *mp;
2855 struct vattr vattr;
2856 int error;
2857
2858 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0)
2859 return (error);
2860 VATTR_NULL(&vattr);
2861 if (tptr == NULL) {
2862 microtime(&tv[0]);
2863 tv[1] = tv[0];
2864 vattr.va_vaflags |= VA_UTIMES_NULL;
2865 } else {
2866 error = copyin(tptr, tv, sizeof(tv));
2867 if (error)
2868 goto out;
2869 }
2870 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
2871 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
2872 vattr.va_atime.tv_sec = tv[0].tv_sec;
2873 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000;
2874 vattr.va_mtime.tv_sec = tv[1].tv_sec;
2875 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000;
2876 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
2877 VOP_UNLOCK(vp, 0);
2878 out:
2879 vn_finished_write(mp, 0);
2880 return (error);
2881 }
2882
2883 /*
2884 * Truncate a file given its path name.
2885 */
2886 /* ARGSUSED */
2887 int
2888 sys_truncate(l, v, retval)
2889 struct lwp *l;
2890 void *v;
2891 register_t *retval;
2892 {
2893 struct sys_truncate_args /* {
2894 syscallarg(const char *) path;
2895 syscallarg(int) pad;
2896 syscallarg(off_t) length;
2897 } */ *uap = v;
2898 struct proc *p = l->l_proc;
2899 struct vnode *vp;
2900 struct mount *mp;
2901 struct vattr vattr;
2902 int error;
2903 struct nameidata nd;
2904
2905 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
2906 if ((error = namei(&nd)) != 0)
2907 return (error);
2908 vp = nd.ni_vp;
2909 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) {
2910 vrele(vp);
2911 return (error);
2912 }
2913 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
2914 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
2915 if (vp->v_type == VDIR)
2916 error = EISDIR;
2917 else if ((error = vn_writechk(vp)) == 0 &&
2918 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) {
2919 VATTR_NULL(&vattr);
2920 vattr.va_size = SCARG(uap, length);
2921 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
2922 }
2923 vput(vp);
2924 vn_finished_write(mp, 0);
2925 return (error);
2926 }
2927
2928 /*
2929 * Truncate a file given a file descriptor.
2930 */
2931 /* ARGSUSED */
2932 int
2933 sys_ftruncate(l, v, retval)
2934 struct lwp *l;
2935 void *v;
2936 register_t *retval;
2937 {
2938 struct sys_ftruncate_args /* {
2939 syscallarg(int) fd;
2940 syscallarg(int) pad;
2941 syscallarg(off_t) length;
2942 } */ *uap = v;
2943 struct proc *p = l->l_proc;
2944 struct mount *mp;
2945 struct vattr vattr;
2946 struct vnode *vp;
2947 struct file *fp;
2948 int error;
2949
2950 /* getvnode() will use the descriptor for us */
2951 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
2952 return (error);
2953 if ((fp->f_flag & FWRITE) == 0) {
2954 error = EINVAL;
2955 goto out;
2956 }
2957 vp = (struct vnode *)fp->f_data;
2958 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) {
2959 FILE_UNUSE(fp, p);
2960 return (error);
2961 }
2962 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
2963 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
2964 if (vp->v_type == VDIR)
2965 error = EISDIR;
2966 else if ((error = vn_writechk(vp)) == 0) {
2967 VATTR_NULL(&vattr);
2968 vattr.va_size = SCARG(uap, length);
2969 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p);
2970 }
2971 VOP_UNLOCK(vp, 0);
2972 vn_finished_write(mp, 0);
2973 out:
2974 FILE_UNUSE(fp, p);
2975 return (error);
2976 }
2977
2978 /*
2979 * Sync an open file.
2980 */
2981 /* ARGSUSED */
2982 int
2983 sys_fsync(l, v, retval)
2984 struct lwp *l;
2985 void *v;
2986 register_t *retval;
2987 {
2988 struct sys_fsync_args /* {
2989 syscallarg(int) fd;
2990 } */ *uap = v;
2991 struct proc *p = l->l_proc;
2992 struct vnode *vp;
2993 struct mount *mp;
2994 struct file *fp;
2995 int error;
2996
2997 /* getvnode() will use the descriptor for us */
2998 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
2999 return (error);
3000 vp = (struct vnode *)fp->f_data;
3001 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) {
3002 FILE_UNUSE(fp, p);
3003 return (error);
3004 }
3005 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
3006 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, 0, 0, p);
3007 if (error == 0 && bioops.io_fsync != NULL &&
3008 vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP))
3009 (*bioops.io_fsync)(vp);
3010 VOP_UNLOCK(vp, 0);
3011 vn_finished_write(mp, 0);
3012 FILE_UNUSE(fp, p);
3013 return (error);
3014 }
3015
3016 /*
3017 * Sync a range of file data. API modeled after that found in AIX.
3018 *
3019 * FDATASYNC indicates that we need only save enough metadata to be able
3020 * to re-read the written data. Note we duplicate AIX's requirement that
3021 * the file be open for writing.
3022 */
3023 /* ARGSUSED */
3024 int
3025 sys_fsync_range(l, v, retval)
3026 struct lwp *l;
3027 void *v;
3028 register_t *retval;
3029 {
3030 struct sys_fsync_range_args /* {
3031 syscallarg(int) fd;
3032 syscallarg(int) flags;
3033 syscallarg(off_t) start;
3034 syscallarg(int) length;
3035 } */ *uap = v;
3036 struct proc *p = l->l_proc;
3037 struct vnode *vp;
3038 struct file *fp;
3039 int flags, nflags;
3040 off_t s, e, len;
3041 int error;
3042
3043 /* getvnode() will use the descriptor for us */
3044 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
3045 return (error);
3046
3047 if ((fp->f_flag & FWRITE) == 0) {
3048 error = EBADF;
3049 goto out;
3050 }
3051
3052 flags = SCARG(uap, flags);
3053 if (((flags & (FDATASYNC | FFILESYNC)) == 0) ||
3054 ((~flags & (FDATASYNC | FFILESYNC)) == 0)) {
3055 error = EINVAL;
3056 goto out;
3057 }
3058 /* Now set up the flags for value(s) to pass to VOP_FSYNC() */
3059 if (flags & FDATASYNC)
3060 nflags = FSYNC_DATAONLY | FSYNC_WAIT;
3061 else
3062 nflags = FSYNC_WAIT;
3063
3064 len = SCARG(uap, length);
3065 /* If length == 0, we do the whole file, and s = l = 0 will do that */
3066 if (len) {
3067 s = SCARG(uap, start);
3068 e = s + len;
3069 if (e < s) {
3070 FILE_UNUSE(fp, p);
3071 error = EINVAL;
3072 goto out;
3073 }
3074 } else {
3075 e = 0;
3076 s = 0;
3077 }
3078
3079 vp = (struct vnode *)fp->f_data;
3080 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
3081 error = VOP_FSYNC(vp, fp->f_cred, nflags, s, e, p);
3082
3083 if (error == 0 && bioops.io_fsync != NULL &&
3084 vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP))
3085 (*bioops.io_fsync)(vp);
3086
3087 VOP_UNLOCK(vp, 0);
3088 out:
3089 FILE_UNUSE(fp, p);
3090 return (error);
3091 }
3092
3093 /*
3094 * Sync the data of an open file.
3095 */
3096 /* ARGSUSED */
3097 int
3098 sys_fdatasync(l, v, retval)
3099 struct lwp *l;
3100 void *v;
3101 register_t *retval;
3102 {
3103 struct sys_fdatasync_args /* {
3104 syscallarg(int) fd;
3105 } */ *uap = v;
3106 struct proc *p = l->l_proc;
3107 struct vnode *vp;
3108 struct file *fp;
3109 int error;
3110
3111 /* getvnode() will use the descriptor for us */
3112 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
3113 return (error);
3114 if ((fp->f_flag & FWRITE) == 0) {
3115 FILE_UNUSE(fp, p);
3116 return (EBADF);
3117 }
3118 vp = (struct vnode *)fp->f_data;
3119 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
3120 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, 0, 0, p);
3121 VOP_UNLOCK(vp, 0);
3122 FILE_UNUSE(fp, p);
3123 return (error);
3124 }
3125
3126 /*
3127 * Rename files, (standard) BSD semantics frontend.
3128 */
3129 /* ARGSUSED */
3130 int
3131 sys_rename(l, v, retval)
3132 struct lwp *l;
3133 void *v;
3134 register_t *retval;
3135 {
3136 struct sys_rename_args /* {
3137 syscallarg(const char *) from;
3138 syscallarg(const char *) to;
3139 } */ *uap = v;
3140 struct proc *p = l->l_proc;
3141
3142 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0));
3143 }
3144
3145 /*
3146 * Rename files, POSIX semantics frontend.
3147 */
3148 /* ARGSUSED */
3149 int
3150 sys___posix_rename(l, v, retval)
3151 struct lwp *l;
3152 void *v;
3153 register_t *retval;
3154 {
3155 struct sys___posix_rename_args /* {
3156 syscallarg(const char *) from;
3157 syscallarg(const char *) to;
3158 } */ *uap = v;
3159 struct proc *p = l->l_proc;
3160
3161 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1));
3162 }
3163
3164 /*
3165 * Rename files. Source and destination must either both be directories,
3166 * or both not be directories. If target is a directory, it must be empty.
3167 * If `from' and `to' refer to the same object, the value of the `retain'
3168 * argument is used to determine whether `from' will be
3169 *
3170 * (retain == 0) deleted unless `from' and `to' refer to the same
3171 * object in the file system's name space (BSD).
3172 * (retain == 1) always retained (POSIX).
3173 */
3174 static int
3175 rename_files(from, to, p, retain)
3176 const char *from, *to;
3177 struct proc *p;
3178 int retain;
3179 {
3180 struct mount *mp = NULL;
3181 struct vnode *tvp, *fvp, *tdvp;
3182 struct nameidata fromnd, tond;
3183 int error;
3184
3185 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE,
3186 from, p);
3187 if ((error = namei(&fromnd)) != 0)
3188 return (error);
3189 fvp = fromnd.ni_vp;
3190 error = vn_start_write(fvp, &mp, V_WAIT | V_PCATCH);
3191 if (error != 0) {
3192 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd);
3193 vrele(fromnd.ni_dvp);
3194 vrele(fvp);
3195 if (fromnd.ni_startdir)
3196 vrele(fromnd.ni_startdir);
3197 PNBUF_PUT(fromnd.ni_cnd.cn_pnbuf);
3198 return (error);
3199 }
3200 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART |
3201 (fvp->v_type == VDIR ? CREATEDIR : 0), UIO_USERSPACE, to, p);
3202 if ((error = namei(&tond)) != 0) {
3203 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd);
3204 vrele(fromnd.ni_dvp);
3205 vrele(fvp);
3206 goto out1;
3207 }
3208 tdvp = tond.ni_dvp;
3209 tvp = tond.ni_vp;
3210
3211 if (tvp != NULL) {
3212 if (fvp->v_type == VDIR && tvp->v_type != VDIR) {
3213 error = ENOTDIR;
3214 goto out;
3215 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) {
3216 error = EISDIR;
3217 goto out;
3218 }
3219 }
3220
3221 if (fvp == tdvp)
3222 error = EINVAL;
3223
3224 /*
3225 * Source and destination refer to the same object.
3226 */
3227 if (fvp == tvp) {
3228 if (retain)
3229 error = -1;
3230 else if (fromnd.ni_dvp == tdvp &&
3231 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen &&
3232 !memcmp(fromnd.ni_cnd.cn_nameptr,
3233 tond.ni_cnd.cn_nameptr,
3234 fromnd.ni_cnd.cn_namelen))
3235 error = -1;
3236 }
3237
3238 out:
3239 if (!error) {
3240 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE);
3241 if (fromnd.ni_dvp != tdvp)
3242 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
3243 if (tvp) {
3244 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE);
3245 }
3246 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd,
3247 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd);
3248 } else {
3249 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd);
3250 if (tdvp == tvp)
3251 vrele(tdvp);
3252 else
3253 vput(tdvp);
3254 if (tvp)
3255 vput(tvp);
3256 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd);
3257 vrele(fromnd.ni_dvp);
3258 vrele(fvp);
3259 }
3260 vrele(tond.ni_startdir);
3261 PNBUF_PUT(tond.ni_cnd.cn_pnbuf);
3262 out1:
3263 vn_finished_write(mp, 0);
3264 if (fromnd.ni_startdir)
3265 vrele(fromnd.ni_startdir);
3266 PNBUF_PUT(fromnd.ni_cnd.cn_pnbuf);
3267 return (error == -1 ? 0 : error);
3268 }
3269
3270 /*
3271 * Make a directory file.
3272 */
3273 /* ARGSUSED */
3274 int
3275 sys_mkdir(l, v, retval)
3276 struct lwp *l;
3277 void *v;
3278 register_t *retval;
3279 {
3280 struct sys_mkdir_args /* {
3281 syscallarg(const char *) path;
3282 syscallarg(int) mode;
3283 } */ *uap = v;
3284 struct proc *p = l->l_proc;
3285 struct mount *mp;
3286 struct vnode *vp;
3287 struct vattr vattr;
3288 int error;
3289 struct nameidata nd;
3290
3291 restart:
3292 NDINIT(&nd, CREATE, LOCKPARENT | CREATEDIR, UIO_USERSPACE,
3293 SCARG(uap, path), p);
3294 if ((error = namei(&nd)) != 0)
3295 return (error);
3296 vp = nd.ni_vp;
3297 if (vp != NULL) {
3298 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
3299 if (nd.ni_dvp == vp)
3300 vrele(nd.ni_dvp);
3301 else
3302 vput(nd.ni_dvp);
3303 vrele(vp);
3304 return (EEXIST);
3305 }
3306 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
3307 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
3308 if (nd.ni_dvp == vp)
3309 vrele(nd.ni_dvp);
3310 else
3311 vput(nd.ni_dvp);
3312 if ((error = vn_start_write(NULL, &mp,
3313 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0)
3314 return (error);
3315 goto restart;
3316 }
3317 VATTR_NULL(&vattr);
3318 vattr.va_type = VDIR;
3319 vattr.va_mode =
3320 (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask;
3321 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
3322 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
3323 if (!error)
3324 vput(nd.ni_vp);
3325 vn_finished_write(mp, 0);
3326 return (error);
3327 }
3328
3329 /*
3330 * Remove a directory file.
3331 */
3332 /* ARGSUSED */
3333 int
3334 sys_rmdir(l, v, retval)
3335 struct lwp *l;
3336 void *v;
3337 register_t *retval;
3338 {
3339 struct sys_rmdir_args /* {
3340 syscallarg(const char *) path;
3341 } */ *uap = v;
3342 struct proc *p = l->l_proc;
3343 struct mount *mp;
3344 struct vnode *vp;
3345 int error;
3346 struct nameidata nd;
3347
3348 restart:
3349 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE,
3350 SCARG(uap, path), p);
3351 if ((error = namei(&nd)) != 0)
3352 return (error);
3353 vp = nd.ni_vp;
3354 if (vp->v_type != VDIR) {
3355 error = ENOTDIR;
3356 goto out;
3357 }
3358 /*
3359 * No rmdir "." please.
3360 */
3361 if (nd.ni_dvp == vp) {
3362 error = EINVAL;
3363 goto out;
3364 }
3365 /*
3366 * The root of a mounted filesystem cannot be deleted.
3367 */
3368 if (vp->v_flag & VROOT) {
3369 error = EBUSY;
3370 goto out;
3371 }
3372 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
3373 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
3374 if (nd.ni_dvp == vp)
3375 vrele(nd.ni_dvp);
3376 else
3377 vput(nd.ni_dvp);
3378 vput(vp);
3379 if ((error = vn_start_write(NULL, &mp,
3380 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0)
3381 return (error);
3382 goto restart;
3383 }
3384 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
3385 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
3386 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd);
3387 vn_finished_write(mp, 0);
3388 return (error);
3389
3390 out:
3391 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
3392 if (nd.ni_dvp == vp)
3393 vrele(nd.ni_dvp);
3394 else
3395 vput(nd.ni_dvp);
3396 vput(vp);
3397 return (error);
3398 }
3399
3400 /*
3401 * Read a block of directory entries in a file system independent format.
3402 */
3403 int
3404 sys_getdents(l, v, retval)
3405 struct lwp *l;
3406 void *v;
3407 register_t *retval;
3408 {
3409 struct sys_getdents_args /* {
3410 syscallarg(int) fd;
3411 syscallarg(char *) buf;
3412 syscallarg(size_t) count;
3413 } */ *uap = v;
3414 struct proc *p = l->l_proc;
3415 struct file *fp;
3416 int error, done;
3417
3418 /* getvnode() will use the descriptor for us */
3419 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
3420 return (error);
3421 if ((fp->f_flag & FREAD) == 0) {
3422 error = EBADF;
3423 goto out;
3424 }
3425 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE,
3426 SCARG(uap, count), &done, p, 0, 0);
3427 #ifdef KTRACE
3428 if (!error && KTRPOINT(p, KTR_GENIO)) {
3429 struct iovec iov;
3430 iov.iov_base = SCARG(uap, buf);
3431 iov.iov_len = done;
3432 ktrgenio(p, SCARG(uap, fd), UIO_READ, &iov, done, 0);
3433 }
3434 #endif
3435 *retval = done;
3436 out:
3437 FILE_UNUSE(fp, p);
3438 return (error);
3439 }
3440
3441 /*
3442 * Set the mode mask for creation of filesystem nodes.
3443 */
3444 int
3445 sys_umask(l, v, retval)
3446 struct lwp *l;
3447 void *v;
3448 register_t *retval;
3449 {
3450 struct sys_umask_args /* {
3451 syscallarg(mode_t) newmask;
3452 } */ *uap = v;
3453 struct proc *p = l->l_proc;
3454 struct cwdinfo *cwdi;
3455
3456 cwdi = p->p_cwdi;
3457 *retval = cwdi->cwdi_cmask;
3458 cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS;
3459 return (0);
3460 }
3461
3462 /*
3463 * Void all references to file by ripping underlying filesystem
3464 * away from vnode.
3465 */
3466 /* ARGSUSED */
3467 int
3468 sys_revoke(l, v, retval)
3469 struct lwp *l;
3470 void *v;
3471 register_t *retval;
3472 {
3473 struct sys_revoke_args /* {
3474 syscallarg(const char *) path;
3475 } */ *uap = v;
3476 struct proc *p = l->l_proc;
3477 struct mount *mp;
3478 struct vnode *vp;
3479 struct vattr vattr;
3480 int error;
3481 struct nameidata nd;
3482
3483 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
3484 if ((error = namei(&nd)) != 0)
3485 return (error);
3486 vp = nd.ni_vp;
3487 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0)
3488 goto out;
3489 if (p->p_ucred->cr_uid != vattr.va_uid &&
3490 (error = suser(p->p_ucred, &p->p_acflag)) != 0)
3491 goto out;
3492 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0)
3493 goto out;
3494 if (vp->v_usecount > 1 || (vp->v_flag & (VALIASED | VLAYER)))
3495 VOP_REVOKE(vp, REVOKEALL);
3496 vn_finished_write(mp, 0);
3497 out:
3498 vrele(vp);
3499 return (error);
3500 }
3501
3502 /*
3503 * Convert a user file descriptor to a kernel file entry.
3504 */
3505 int
3506 getvnode(fdp, fd, fpp)
3507 struct filedesc *fdp;
3508 int fd;
3509 struct file **fpp;
3510 {
3511 struct vnode *vp;
3512 struct file *fp;
3513
3514 if ((fp = fd_getfile(fdp, fd)) == NULL)
3515 return (EBADF);
3516
3517 FILE_USE(fp);
3518
3519 if (fp->f_type != DTYPE_VNODE) {
3520 FILE_UNUSE(fp, NULL);
3521 return (EINVAL);
3522 }
3523
3524 vp = (struct vnode *)fp->f_data;
3525 if (vp->v_type == VBAD) {
3526 FILE_UNUSE(fp, NULL);
3527 return (EBADF);
3528 }
3529
3530 *fpp = fp;
3531 return (0);
3532 }
Cache object: 058ac5ea99a6132d324fa01d56a021a6
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