Replace the linear search in file descriptor allocation with an O(log N)
[dragonfly.git] / sys / kern / vfs_syscalls.c
CommitLineData
984263bc
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1/*
2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 * @(#)vfs_syscalls.c 8.13 (Berkeley) 4/15/94
39 * $FreeBSD: src/sys/kern/vfs_syscalls.c,v 1.151.2.18 2003/04/04 20:35:58 tegge Exp $
69908319 40 * $DragonFly: src/sys/kern/vfs_syscalls.c,v 1.63 2005/06/21 23:58:53 hsu Exp $
984263bc
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41 */
42
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43#include <sys/param.h>
44#include <sys/systm.h>
45#include <sys/buf.h>
16df2c74 46#include <sys/conf.h>
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47#include <sys/sysent.h>
48#include <sys/malloc.h>
49#include <sys/mount.h>
432b8263 50#include <sys/mountctl.h>
984263bc 51#include <sys/sysproto.h>
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52#include <sys/filedesc.h>
53#include <sys/kernel.h>
54#include <sys/fcntl.h>
55#include <sys/file.h>
56#include <sys/linker.h>
57#include <sys/stat.h>
58#include <sys/unistd.h>
59#include <sys/vnode.h>
60#include <sys/proc.h>
dadab5e9 61#include <sys/namei.h>
21739618 62#include <sys/nlookup.h>
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63#include <sys/dirent.h>
64#include <sys/extattr.h>
8f6f8622 65#include <sys/kern_syscall.h>
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66
67#include <machine/limits.h>
1f2de5d4 68#include <vfs/union/union.h>
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69#include <sys/sysctl.h>
70#include <vm/vm.h>
71#include <vm/vm_object.h>
72#include <vm/vm_zone.h>
73#include <vm/vm_page.h>
74
dadab5e9
MD
75#include <sys/file2.h>
76
e24b948e 77static int checkvp_chdir (struct vnode *vn, struct thread *td);
21739618 78static void checkdirs (struct vnode *olddp, struct namecache *ncp);
402ed7e1 79static int chroot_refuse_vdir_fds (struct filedesc *fdp);
75ffff0d 80static int chroot_visible_mnt(struct mount *mp, struct proc *p);
402ed7e1
RG
81static int getutimes (const struct timeval *, struct timespec *);
82static int setfown (struct vnode *, uid_t, gid_t);
83static int setfmode (struct vnode *, int);
84static int setfflags (struct vnode *, int);
85static int setutimes (struct vnode *, const struct timespec *, int);
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86static int usermount = 0; /* if 1, non-root can mount fs. */
87
402ed7e1 88int (*union_dircheckp) (struct thread *, struct vnode **, struct file *);
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89
90SYSCTL_INT(_vfs, OID_AUTO, usermount, CTLFLAG_RW, &usermount, 0, "");
91
92/*
93 * Virtual File System System Calls
94 */
95
96/*
97 * Mount a file system.
98 */
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99/*
100 * mount_args(char *type, char *path, int flags, caddr_t data)
101 */
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102/* ARGSUSED */
103int
41c20dac 104mount(struct mount_args *uap)
984263bc 105{
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106 struct thread *td = curthread;
107 struct proc *p = td->td_proc;
984263bc 108 struct vnode *vp;
21739618 109 struct namecache *ncp;
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110 struct mount *mp;
111 struct vfsconf *vfsp;
112 int error, flag = 0, flag2 = 0;
113 struct vattr va;
21739618 114 struct nlookupdata nd;
984263bc 115 char fstypename[MFSNAMELEN];
21739618 116 struct nlcomponent nlc;
984263bc 117
cd0d3e17 118 KKASSERT(p);
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119 if (p->p_ucred->cr_prison != NULL)
120 return (EPERM);
dadab5e9 121 if (usermount == 0 && (error = suser(td)))
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122 return (error);
123 /*
124 * Do not allow NFS export by non-root users.
125 */
ab2eb4eb 126 if (uap->flags & MNT_EXPORTED) {
dadab5e9 127 error = suser(td);
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128 if (error)
129 return (error);
130 }
131 /*
132 * Silently enforce MNT_NOSUID and MNT_NODEV for non-root users
133 */
dadab5e9 134 if (suser(td))
ab2eb4eb 135 uap->flags |= MNT_NOSUID | MNT_NODEV;
21739618 136
984263bc 137 /*
21739618 138 * Lookup the requested path and extract the ncp and vnode.
984263bc 139 */
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MD
140 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
141 if (error == 0) {
142 if ((error = nlookup(&nd)) == 0) {
143 if (nd.nl_ncp->nc_vp == NULL)
144 error = ENOENT;
145 }
146 }
147 if (error) {
148 nlookup_done(&nd);
984263bc 149 return (error);
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150 }
151
152 /*
153 * Extract the locked+refd ncp and cleanup the nd structure
154 */
155 ncp = nd.nl_ncp;
156 nd.nl_ncp = NULL;
157 nlookup_done(&nd);
158
159 /*
160 * now we have the locked ref'd ncp and unreferenced vnode.
161 */
162 vp = ncp->nc_vp;
5fd012e0 163 if ((error = vget(vp, LK_EXCLUSIVE, td)) != 0) {
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164 cache_put(ncp);
165 return (error);
166 }
167 cache_unlock(ncp);
168
169 /*
170 * Now we have an unlocked ref'd ncp and a locked ref'd vp
171 */
ab2eb4eb 172 if (uap->flags & MNT_UPDATE) {
984263bc 173 if ((vp->v_flag & VROOT) == 0) {
21739618 174 cache_drop(ncp);
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175 vput(vp);
176 return (EINVAL);
177 }
178 mp = vp->v_mount;
179 flag = mp->mnt_flag;
180 flag2 = mp->mnt_kern_flag;
181 /*
182 * We only allow the filesystem to be reloaded if it
183 * is currently mounted read-only.
184 */
ab2eb4eb 185 if ((uap->flags & MNT_RELOAD) &&
984263bc 186 ((mp->mnt_flag & MNT_RDONLY) == 0)) {
21739618 187 cache_drop(ncp);
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188 vput(vp);
189 return (EOPNOTSUPP); /* Needs translation */
190 }
191 /*
192 * Only root, or the user that did the original mount is
193 * permitted to update it.
194 */
195 if (mp->mnt_stat.f_owner != p->p_ucred->cr_uid &&
dadab5e9 196 (error = suser(td))) {
21739618 197 cache_drop(ncp);
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198 vput(vp);
199 return (error);
200 }
861905fb 201 if (vfs_busy(mp, LK_NOWAIT, td)) {
21739618 202 cache_drop(ncp);
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203 vput(vp);
204 return (EBUSY);
205 }
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206 if ((vp->v_flag & VMOUNT) != 0 ||
207 vp->v_mountedhere != NULL) {
21739618 208 cache_drop(ncp);
dadab5e9 209 vfs_unbusy(mp, td);
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210 vput(vp);
211 return (EBUSY);
212 }
213 vp->v_flag |= VMOUNT;
984263bc 214 mp->mnt_flag |=
ab2eb4eb 215 uap->flags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE);
5fd012e0 216 VOP_UNLOCK(vp, 0, td);
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217 goto update;
218 }
219 /*
220 * If the user is not root, ensure that they own the directory
221 * onto which we are attempting to mount.
222 */
3b568787 223 if ((error = VOP_GETATTR(vp, &va, td)) ||
984263bc 224 (va.va_uid != p->p_ucred->cr_uid &&
dadab5e9 225 (error = suser(td)))) {
21739618 226 cache_drop(ncp);
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227 vput(vp);
228 return (error);
229 }
3b568787 230 if ((error = vinvalbuf(vp, V_SAVE, td, 0, 0)) != 0) {
21739618 231 cache_drop(ncp);
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232 vput(vp);
233 return (error);
234 }
235 if (vp->v_type != VDIR) {
21739618 236 cache_drop(ncp);
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237 vput(vp);
238 return (ENOTDIR);
239 }
ab2eb4eb 240 if ((error = copyinstr(uap->type, fstypename, MFSNAMELEN, NULL)) != 0) {
21739618 241 cache_drop(ncp);
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242 vput(vp);
243 return (error);
244 }
21739618 245 for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) {
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246 if (!strcmp(vfsp->vfc_name, fstypename))
247 break;
21739618 248 }
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249 if (vfsp == NULL) {
250 linker_file_t lf;
251
252 /* Only load modules for root (very important!) */
dadab5e9 253 if ((error = suser(td)) != 0) {
21739618 254 cache_drop(ncp);
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255 vput(vp);
256 return error;
257 }
258 error = linker_load_file(fstypename, &lf);
259 if (error || lf == NULL) {
21739618 260 cache_drop(ncp);
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261 vput(vp);
262 if (lf == NULL)
263 error = ENODEV;
264 return error;
265 }
266 lf->userrefs++;
267 /* lookup again, see if the VFS was loaded */
21739618 268 for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) {
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269 if (!strcmp(vfsp->vfc_name, fstypename))
270 break;
21739618 271 }
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272 if (vfsp == NULL) {
273 lf->userrefs--;
274 linker_file_unload(lf);
21739618 275 cache_drop(ncp);
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276 vput(vp);
277 return (ENODEV);
278 }
279 }
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280 if ((vp->v_flag & VMOUNT) != 0 ||
281 vp->v_mountedhere != NULL) {
21739618 282 cache_drop(ncp);
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283 vput(vp);
284 return (EBUSY);
285 }
286 vp->v_flag |= VMOUNT;
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287
288 /*
289 * Allocate and initialize the filesystem.
290 */
0961aa92 291 mp = malloc(sizeof(struct mount), M_MOUNT, M_ZERO|M_WAITOK);
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292 TAILQ_INIT(&mp->mnt_nvnodelist);
293 TAILQ_INIT(&mp->mnt_reservedvnlist);
2281065e 294 TAILQ_INIT(&mp->mnt_jlist);
984263bc 295 mp->mnt_nvnodelistsize = 0;
377d4740 296 lockinit(&mp->mnt_lock, 0, "vfslock", 0, LK_NOPAUSE);
861905fb 297 vfs_busy(mp, LK_NOWAIT, td);
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298 mp->mnt_op = vfsp->vfc_vfsops;
299 mp->mnt_vfc = vfsp;
300 vfsp->vfc_refcount++;
301 mp->mnt_stat.f_type = vfsp->vfc_typenum;
302 mp->mnt_flag |= vfsp->vfc_flags & MNT_VISFLAGMASK;
303 strncpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN);
304 mp->mnt_vnodecovered = vp;
305 mp->mnt_stat.f_owner = p->p_ucred->cr_uid;
306 mp->mnt_iosize_max = DFLTPHYS;
5fd012e0 307 VOP_UNLOCK(vp, 0, td);
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308update:
309 /*
310 * Set the mount level flags.
311 */
ab2eb4eb 312 if (uap->flags & MNT_RDONLY)
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313 mp->mnt_flag |= MNT_RDONLY;
314 else if (mp->mnt_flag & MNT_RDONLY)
315 mp->mnt_kern_flag |= MNTK_WANTRDWR;
316 mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV |
317 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOATIME |
318 MNT_NOSYMFOLLOW | MNT_IGNORE |
319 MNT_NOCLUSTERR | MNT_NOCLUSTERW | MNT_SUIDDIR);
ab2eb4eb 320 mp->mnt_flag |= uap->flags & (MNT_NOSUID | MNT_NOEXEC |
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321 MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_FORCE |
322 MNT_NOSYMFOLLOW | MNT_IGNORE |
323 MNT_NOATIME | MNT_NOCLUSTERR | MNT_NOCLUSTERW | MNT_SUIDDIR);
324 /*
325 * Mount the filesystem.
326 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they
fad57d0e 327 * get.
984263bc 328 */
ab2eb4eb 329 error = VFS_MOUNT(mp, uap->path, uap->data, td);
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MD
330 if (mp->mnt_flag & MNT_UPDATE) {
331 if (mp->mnt_kern_flag & MNTK_WANTRDWR)
332 mp->mnt_flag &= ~MNT_RDONLY;
333 mp->mnt_flag &=~ (MNT_UPDATE | MNT_RELOAD | MNT_FORCE);
334 mp->mnt_kern_flag &=~ MNTK_WANTRDWR;
335 if (error) {
336 mp->mnt_flag = flag;
337 mp->mnt_kern_flag = flag2;
338 }
dadab5e9 339 vfs_unbusy(mp, td);
984263bc 340 vp->v_flag &= ~VMOUNT;
984263bc 341 vrele(vp);
21739618 342 cache_drop(ncp);
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MD
343 return (error);
344 }
5fd012e0 345 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
984263bc 346 /*
21739618
MD
347 * Put the new filesystem on the mount list after root. The mount
348 * point gets its own mnt_ncp which is a special ncp linking the
349 * vnode-under to the root of the new mount. The lookup code
350 * detects the mount point going forward and detects the special
351 * mnt_ncp via NCP_MOUNTPT going backwards.
8e005a45
MD
352 *
353 * It is not necessary to invalidate or purge the vnode underneath
354 * because elements under the mount will be given their own glue
355 * namecache record.
984263bc 356 */
984263bc 357 if (!error) {
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MD
358 nlc.nlc_nameptr = "";
359 nlc.nlc_namelen = 0;
360 mp->mnt_ncp = cache_nlookup(ncp, &nlc);
2386d5b6 361 cache_setunresolved(mp->mnt_ncp);
21739618 362 mp->mnt_ncp->nc_flag |= NCF_MOUNTPT;
646a1cda 363 mp->mnt_ncp->nc_mount = mp;
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MD
364 cache_drop(ncp);
365 /* XXX get the root of the fs and cache_setvp(mnt_ncp...) */
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366 vp->v_flag &= ~VMOUNT;
367 vp->v_mountedhere = mp;
861905fb 368 mountlist_insert(mp, MNTINS_LAST);
21739618
MD
369 checkdirs(vp, mp->mnt_ncp);
370 cache_unlock(mp->mnt_ncp); /* leave ref intact */
5fd012e0 371 VOP_UNLOCK(vp, 0, td);
41a01a4d 372 error = vfs_allocate_syncvnode(mp);
dadab5e9
MD
373 vfs_unbusy(mp, td);
374 if ((error = VFS_START(mp, 0, td)) != 0)
984263bc
MD
375 vrele(vp);
376 } else {
6ddb7618
MD
377 vfs_rm_vnodeops(&mp->mnt_vn_coherency_ops);
378 vfs_rm_vnodeops(&mp->mnt_vn_journal_ops);
379 vfs_rm_vnodeops(&mp->mnt_vn_norm_ops);
0961aa92
MD
380 vfs_rm_vnodeops(&mp->mnt_vn_spec_ops);
381 vfs_rm_vnodeops(&mp->mnt_vn_fifo_ops);
984263bc 382 vp->v_flag &= ~VMOUNT;
984263bc 383 mp->mnt_vfc->vfc_refcount--;
dadab5e9 384 vfs_unbusy(mp, td);
e38462a2 385 free(mp, M_MOUNT);
21739618 386 cache_drop(ncp);
984263bc
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387 vput(vp);
388 }
389 return (error);
390}
391
392/*
393 * Scan all active processes to see if any of them have a current
394 * or root directory onto which the new filesystem has just been
395 * mounted. If so, replace them with the new mount point.
21739618
MD
396 *
397 * The passed ncp is ref'd and locked (from the mount code) and
398 * must be associated with the vnode representing the root of the
399 * mount point.
984263bc
MD
400 */
401static void
21739618 402checkdirs(struct vnode *olddp, struct namecache *ncp)
984263bc
MD
403{
404 struct filedesc *fdp;
405 struct vnode *newdp;
690a3127 406 struct mount *mp;
984263bc
MD
407 struct proc *p;
408
409 if (olddp->v_usecount == 1)
410 return;
690a3127
MD
411 mp = olddp->v_mountedhere;
412 if (VFS_ROOT(mp, &newdp))
984263bc 413 panic("mount: lost mount");
21739618
MD
414 cache_setvp(ncp, newdp);
415
416 if (rootvnode == olddp) {
417 vref(newdp);
418 vfs_cache_setroot(newdp, cache_hold(ncp));
419 }
420
f62004ad 421 FOREACH_PROC_IN_SYSTEM(p) {
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MD
422 fdp = p->p_fd;
423 if (fdp->fd_cdir == olddp) {
424 vrele(fdp->fd_cdir);
597aea93 425 vref(newdp);
984263bc 426 fdp->fd_cdir = newdp;
690a3127 427 cache_drop(fdp->fd_ncdir);
21739618 428 fdp->fd_ncdir = cache_hold(ncp);
984263bc
MD
429 }
430 if (fdp->fd_rdir == olddp) {
431 vrele(fdp->fd_rdir);
597aea93 432 vref(newdp);
984263bc 433 fdp->fd_rdir = newdp;
690a3127 434 cache_drop(fdp->fd_nrdir);
21739618 435 fdp->fd_nrdir = cache_hold(ncp);
984263bc
MD
436 }
437 }
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438 vput(newdp);
439}
440
441/*
442 * Unmount a file system.
443 *
444 * Note: unmount takes a path to the vnode mounted on as argument,
445 * not special file (as before).
446 */
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MD
447/*
448 * umount_args(char *path, int flags)
449 */
984263bc
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450/* ARGSUSED */
451int
41c20dac 452unmount(struct unmount_args *uap)
984263bc 453{
dadab5e9
MD
454 struct thread *td = curthread;
455 struct proc *p = td->td_proc;
41c20dac 456 struct vnode *vp;
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457 struct mount *mp;
458 int error;
fad57d0e 459 struct nlookupdata nd;
984263bc 460
dadab5e9 461 KKASSERT(p);
84c3a710
HP
462 if (p->p_ucred->cr_prison != NULL)
463 return (EPERM);
464 if (usermount == 0 && (error = suser(td)))
465 return (error);
466
fad57d0e 467 vp = NULL;
ab2eb4eb 468 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
fad57d0e
MD
469 if (error == 0)
470 error = nlookup(&nd);
471 if (error == 0)
472 error = cache_vget(nd.nl_ncp, nd.nl_cred, LK_EXCLUSIVE, &vp);
473 nlookup_done(&nd);
474 if (error)
984263bc 475 return (error);
fad57d0e 476
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477 mp = vp->v_mount;
478
479 /*
480 * Only root, or the user that did the original mount is
481 * permitted to unmount this filesystem.
482 */
483 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) &&
dadab5e9 484 (error = suser(td))) {
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485 vput(vp);
486 return (error);
487 }
488
489 /*
490 * Don't allow unmounting the root file system.
491 */
492 if (mp->mnt_flag & MNT_ROOTFS) {
493 vput(vp);
494 return (EINVAL);
495 }
496
497 /*
498 * Must be the root of the filesystem
499 */
500 if ((vp->v_flag & VROOT) == 0) {
501 vput(vp);
502 return (EINVAL);
503 }
504 vput(vp);
ab2eb4eb 505 return (dounmount(mp, uap->flags, td));
984263bc
MD
506}
507
508/*
509 * Do the actual file system unmount.
510 */
861905fb
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511static int
512dounmount_interlock(struct mount *mp)
513{
514 if (mp->mnt_kern_flag & MNTK_UNMOUNT)
515 return (EBUSY);
516 mp->mnt_kern_flag |= MNTK_UNMOUNT;
517 return(0);
518}
519
984263bc 520int
dadab5e9 521dounmount(struct mount *mp, int flags, struct thread *td)
984263bc
MD
522{
523 struct vnode *coveredvp;
524 int error;
525 int async_flag;
526
861905fb
MD
527 /*
528 * Exclusive access for unmounting purposes
529 */
530 if ((error = mountlist_interlock(dounmount_interlock, mp)) != 0)
531 return (error);
532
533 /*
534 * Allow filesystems to detect that a forced unmount is in progress.
535 */
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MD
536 if (flags & MNT_FORCE)
537 mp->mnt_kern_flag |= MNTK_UNMOUNTF;
861905fb
MD
538 error = lockmgr(&mp->mnt_lock, LK_DRAIN |
539 ((flags & MNT_FORCE) ? 0 : LK_NOWAIT), NULL, td);
984263bc
MD
540 if (error) {
541 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF);
542 if (mp->mnt_kern_flag & MNTK_MWAIT)
e38462a2 543 wakeup(mp);
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MD
544 return (error);
545 }
546
547 if (mp->mnt_flag & MNT_EXPUBLIC)
548 vfs_setpublicfs(NULL, NULL, NULL);
549
550 vfs_msync(mp, MNT_WAIT);
551 async_flag = mp->mnt_flag & MNT_ASYNC;
552 mp->mnt_flag &=~ MNT_ASYNC;
553 cache_purgevfs(mp); /* remove cache entries for this file sys */
554 if (mp->mnt_syncer != NULL)
555 vrele(mp->mnt_syncer);
556 if (((mp->mnt_flag & MNT_RDONLY) ||
3b568787 557 (error = VFS_SYNC(mp, MNT_WAIT, td)) == 0) ||
984263bc 558 (flags & MNT_FORCE))
dadab5e9 559 error = VFS_UNMOUNT(mp, flags, td);
984263bc 560 if (error) {
41a01a4d
MD
561 if (mp->mnt_syncer == NULL)
562 vfs_allocate_syncvnode(mp);
984263bc
MD
563 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF);
564 mp->mnt_flag |= async_flag;
861905fb 565 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_REENABLE, NULL, td);
984263bc 566 if (mp->mnt_kern_flag & MNTK_MWAIT)
e38462a2 567 wakeup(mp);
984263bc
MD
568 return (error);
569 }
432b8263
MD
570 /*
571 * Clean up any journals still associated with the mount after
572 * filesystem activity has ceased.
573 */
574 journal_remove_all_journals(mp,
575 ((flags & MNT_FORCE) ? MC_JOURNAL_STOP_IMM : 0));
576
861905fb 577 mountlist_remove(mp);
0961aa92
MD
578
579 /*
580 * Remove any installed vnode ops here so the individual VFSs don't
581 * have to.
582 */
6ddb7618
MD
583 vfs_rm_vnodeops(&mp->mnt_vn_coherency_ops);
584 vfs_rm_vnodeops(&mp->mnt_vn_journal_ops);
585 vfs_rm_vnodeops(&mp->mnt_vn_norm_ops);
0961aa92
MD
586 vfs_rm_vnodeops(&mp->mnt_vn_spec_ops);
587 vfs_rm_vnodeops(&mp->mnt_vn_fifo_ops);
588
984263bc 589 if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) {
7ea21ed1 590 coveredvp->v_mountedhere = NULL;
984263bc 591 vrele(coveredvp);
21739618
MD
592 cache_drop(mp->mnt_ncp);
593 mp->mnt_ncp = NULL;
984263bc
MD
594 }
595 mp->mnt_vfc->vfc_refcount--;
596 if (!TAILQ_EMPTY(&mp->mnt_nvnodelist))
597 panic("unmount: dangling vnode");
861905fb 598 lockmgr(&mp->mnt_lock, LK_RELEASE, NULL, td);
984263bc 599 if (mp->mnt_kern_flag & MNTK_MWAIT)
e38462a2
DR
600 wakeup(mp);
601 free(mp, M_MOUNT);
984263bc
MD
602 return (0);
603}
604
605/*
606 * Sync each mounted filesystem.
607 */
984263bc
MD
608
609#ifdef DEBUG
610static int syncprt = 0;
611SYSCTL_INT(_debug, OID_AUTO, syncprt, CTLFLAG_RW, &syncprt, 0, "");
6bdbb368 612#endif /* DEBUG */
984263bc 613
861905fb
MD
614static int sync_callback(struct mount *mp, void *data);
615
984263bc
MD
616/* ARGSUSED */
617int
41c20dac 618sync(struct sync_args *uap)
984263bc 619{
861905fb 620 mountlist_scan(sync_callback, NULL, MNTSCAN_FORWARD);
6bdbb368 621#ifdef DEBUG
861905fb
MD
622 /*
623 * print out buffer pool stat information on each sync() call.
624 */
984263bc
MD
625 if (syncprt)
626 vfs_bufstats();
6bdbb368 627#endif /* DEBUG */
984263bc
MD
628 return (0);
629}
630
861905fb
MD
631static
632int
633sync_callback(struct mount *mp, void *data __unused)
634{
635 int asyncflag;
636
637 if ((mp->mnt_flag & MNT_RDONLY) == 0) {
638 asyncflag = mp->mnt_flag & MNT_ASYNC;
639 mp->mnt_flag &= ~MNT_ASYNC;
640 vfs_msync(mp, MNT_NOWAIT);
641 VFS_SYNC(mp, MNT_NOWAIT, curthread);
642 mp->mnt_flag |= asyncflag;
643 }
644 return(0);
645}
646
984263bc
MD
647/* XXX PRISON: could be per prison flag */
648static int prison_quotas;
649#if 0
650SYSCTL_INT(_kern_prison, OID_AUTO, quotas, CTLFLAG_RW, &prison_quotas, 0, "");
651#endif
652
653/*
41c20dac
MD
654 * quotactl_args(char *path, int fcmd, int uid, caddr_t arg)
655 *
984263bc
MD
656 * Change filesystem quotas.
657 */
984263bc
MD
658/* ARGSUSED */
659int
41c20dac 660quotactl(struct quotactl_args *uap)
984263bc 661{
fad57d0e
MD
662 struct nlookupdata nd;
663 struct thread *td;
664 struct proc *p;
41c20dac 665 struct mount *mp;
984263bc 666 int error;
984263bc 667
fad57d0e
MD
668 td = curthread;
669 p = td->td_proc;
41c20dac 670 if (p->p_ucred->cr_prison && !prison_quotas)
984263bc 671 return (EPERM);
fad57d0e 672
ab2eb4eb 673 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
fad57d0e
MD
674 if (error == 0)
675 error = nlookup(&nd);
676 if (error == 0) {
677 mp = nd.nl_ncp->nc_mount;
ab2eb4eb
DR
678 error = VFS_QUOTACTL(mp, uap->cmd, uap->uid,
679 uap->arg, nd.nl_td);
fad57d0e
MD
680 }
681 nlookup_done(&nd);
682 return (error);
984263bc
MD
683}
684
949ecb9b 685/*
2281065e 686 * mountctl(char *path, int op, int fd, const void *ctl, int ctllen,
949ecb9b
MD
687 * void *buf, int buflen)
688 *
689 * This function operates on a mount point and executes the specified
690 * operation using the specified control data, and possibly returns data.
691 *
692 * The actual number of bytes stored in the result buffer is returned, 0
693 * if none, otherwise an error is returned.
694 */
695/* ARGSUSED */
696int
697mountctl(struct mountctl_args *uap)
698{
699 struct thread *td = curthread;
700 struct proc *p = td->td_proc;
2281065e
MD
701 struct filedesc *fdp = p->p_fd;
702 struct file *fp;
949ecb9b
MD
703 void *ctl = NULL;
704 void *buf = NULL;
705 char *path = NULL;
706 int error;
707
708 /*
709 * Sanity and permissions checks. We must be root.
710 */
711 KKASSERT(p);
712 if (p->p_ucred->cr_prison != NULL)
713 return (EPERM);
714 if ((error = suser(td)) != 0)
715 return (error);
716
717 /*
718 * Argument length checks
719 */
39b13188 720 if (uap->ctllen < 0 || uap->ctllen > 1024)
949ecb9b 721 return (EINVAL);
39b13188 722 if (uap->buflen < 0 || uap->buflen > 16 * 1024)
949ecb9b
MD
723 return (EINVAL);
724 if (uap->path == NULL)
725 return (EINVAL);
726
727 /*
728 * Allocate the necessary buffers and copyin data
729 */
730 path = zalloc(namei_zone);
731 error = copyinstr(uap->path, path, MAXPATHLEN, NULL);
732 if (error)
733 goto done;
734
735 if (uap->ctllen) {
736 ctl = malloc(uap->ctllen + 1, M_TEMP, M_WAITOK|M_ZERO);
737 error = copyin(uap->ctl, ctl, uap->ctllen);
738 if (error)
739 goto done;
740 }
741 if (uap->buflen)
742 buf = malloc(uap->buflen + 1, M_TEMP, M_WAITOK|M_ZERO);
743
2281065e
MD
744 /*
745 * Validate the descriptor
746 */
747 if (uap->fd == -1) {
748 fp = NULL;
749 } else if ((u_int)uap->fd >= fdp->fd_nfiles ||
750 (fp = fdp->fd_ofiles[uap->fd]) == NULL) {
751 error = EBADF;
752 goto done;
753 }
754 if (fp)
755 fhold(fp);
756
949ecb9b
MD
757 /*
758 * Execute the internal kernel function and clean up.
759 */
2281065e
MD
760 error = kern_mountctl(path, uap->op, fp, ctl, uap->ctllen, buf, uap->buflen, &uap->sysmsg_result);
761 if (fp)
762 fdrop(fp, td);
949ecb9b
MD
763 if (error == 0 && uap->sysmsg_result > 0)
764 error = copyout(buf, uap->buf, uap->sysmsg_result);
765done:
766 if (path)
767 zfree(namei_zone, path);
768 if (ctl)
769 free(ctl, M_TEMP);
770 if (buf)
771 free(buf, M_TEMP);
772 return (error);
773}
774
775/*
776 * Execute a mount control operation by resolving the path to a mount point
777 * and calling vop_mountctl().
778 */
779int
2281065e
MD
780kern_mountctl(const char *path, int op, struct file *fp,
781 const void *ctl, int ctllen,
949ecb9b
MD
782 void *buf, int buflen, int *res)
783{
949ecb9b
MD
784 struct vnode *vp;
785 struct mount *mp;
786 struct nlookupdata nd;
787 int error;
788
789 *res = 0;
790 vp = NULL;
791 error = nlookup_init(&nd, path, UIO_SYSSPACE, NLC_FOLLOW);
792 if (error == 0)
793 error = nlookup(&nd);
794 if (error == 0)
795 error = cache_vget(nd.nl_ncp, nd.nl_cred, LK_EXCLUSIVE, &vp);
796 nlookup_done(&nd);
797 if (error)
798 return (error);
799
800 mp = vp->v_mount;
801
802 /*
803 * Must be the root of the filesystem
804 */
805 if ((vp->v_flag & VROOT) == 0) {
806 vput(vp);
807 return (EINVAL);
808 }
2281065e 809 error = vop_mountctl(mp->mnt_vn_use_ops, op, fp, ctl, ctllen,
949ecb9b
MD
810 buf, buflen, res);
811 vput(vp);
812 return (error);
813}
814
984263bc 815int
fad57d0e 816kern_statfs(struct nlookupdata *nd, struct statfs *buf)
984263bc 817{
dadab5e9 818 struct thread *td = curthread;
75ffff0d 819 struct proc *p = td->td_proc;
41c20dac
MD
820 struct mount *mp;
821 struct statfs *sp;
75ffff0d 822 char *fullpath, *freepath;
984263bc 823 int error;
984263bc 824
fad57d0e 825 if ((error = nlookup(nd)) != 0)
984263bc 826 return (error);
fad57d0e 827 mp = nd->nl_ncp->nc_mount;
984263bc 828 sp = &mp->mnt_stat;
fad57d0e 829 if ((error = VFS_STATFS(mp, sp, td)) != 0)
984263bc 830 return (error);
75ffff0d
JS
831
832 error = cache_fullpath(p, mp->mnt_ncp, &fullpath, &freepath);
833 if (error)
834 return(error);
835 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
836 strlcpy(sp->f_mntonname, fullpath, sizeof(sp->f_mntonname));
837 free(freepath, M_TEMP);
838
984263bc 839 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
9697c509
DRJ
840 bcopy(sp, buf, sizeof(*buf));
841 /* Only root should have access to the fsid's. */
842 if (suser(td))
843 buf->f_fsid.val[0] = buf->f_fsid.val[1] = 0;
844 return (0);
984263bc
MD
845}
846
847/*
9697c509 848 * statfs_args(char *path, struct statfs *buf)
41c20dac 849 *
984263bc
MD
850 * Get filesystem statistics.
851 */
984263bc 852int
9697c509
DRJ
853statfs(struct statfs_args *uap)
854{
fad57d0e 855 struct nlookupdata nd;
9697c509
DRJ
856 struct statfs buf;
857 int error;
858
fad57d0e
MD
859 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
860 if (error == 0)
861 error = kern_statfs(&nd, &buf);
862 nlookup_done(&nd);
9697c509
DRJ
863 if (error == 0)
864 error = copyout(&buf, uap->buf, sizeof(*uap->buf));
865 return (error);
866}
867
868int
869kern_fstatfs(int fd, struct statfs *buf)
984263bc 870{
dadab5e9
MD
871 struct thread *td = curthread;
872 struct proc *p = td->td_proc;
984263bc
MD
873 struct file *fp;
874 struct mount *mp;
1fd87d54 875 struct statfs *sp;
75ffff0d 876 char *fullpath, *freepath;
984263bc 877 int error;
984263bc 878
dadab5e9 879 KKASSERT(p);
9697c509
DRJ
880 error = getvnode(p->p_fd, fd, &fp);
881 if (error)
984263bc
MD
882 return (error);
883 mp = ((struct vnode *)fp->f_data)->v_mount;
884 if (mp == NULL)
885 return (EBADF);
886 sp = &mp->mnt_stat;
dadab5e9 887 error = VFS_STATFS(mp, sp, td);
984263bc
MD
888 if (error)
889 return (error);
75ffff0d
JS
890
891 error = cache_fullpath(p, mp->mnt_ncp, &fullpath, &freepath);
892 if (error)
893 return(error);
894 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
895 strlcpy(sp->f_mntonname, fullpath, sizeof(sp->f_mntonname));
896 free(freepath, M_TEMP);
897
984263bc 898 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
9697c509 899 bcopy(sp, buf, sizeof(*buf));
75ffff0d 900
9697c509
DRJ
901 /* Only root should have access to the fsid's. */
902 if (suser(td))
903 buf->f_fsid.val[0] = buf->f_fsid.val[1] = 0;
904 return (0);
905}
906
907/*
908 * fstatfs_args(int fd, struct statfs *buf)
909 *
910 * Get filesystem statistics.
911 */
912int
913fstatfs(struct fstatfs_args *uap)
914{
915 struct statfs buf;
916 int error;
917
918 error = kern_fstatfs(uap->fd, &buf);
919
920 if (error == 0)
921 error = copyout(&buf, uap->buf, sizeof(*uap->buf));
922 return (error);
984263bc
MD
923}
924
925/*
41c20dac
MD
926 * getfsstat_args(struct statfs *buf, long bufsize, int flags)
927 *
984263bc
MD
928 * Get statistics on all filesystems.
929 */
861905fb
MD
930
931struct getfsstat_info {
932 struct statfs *sfsp;
933 long count;
934 long maxcount;
935 int error;
936 int flags;
937 int is_chrooted;
938 struct thread *td;
939 struct proc *p;
940};
941
942static int getfsstat_callback(struct mount *, void *);
943
41c20dac 944/* ARGSUSED */
984263bc 945int
41c20dac 946getfsstat(struct getfsstat_args *uap)
984263bc 947{
dadab5e9 948 struct thread *td = curthread;
75ffff0d 949 struct proc *p = td->td_proc;
861905fb 950 struct getfsstat_info info;
75ffff0d 951
861905fb 952 bzero(&info, sizeof(info));
75ffff0d 953 if (p != NULL && (p->p_fd->fd_nrdir->nc_flag & NCF_ROOT) == 0)
861905fb
MD
954 info.is_chrooted = 1;
955 else
956 info.is_chrooted = 0;
957
958 info.maxcount = uap->bufsize / sizeof(struct statfs);
959 info.sfsp = uap->buf;
960 info.count = 0;
961 info.flags = uap->flags;
962 info.td = td;
963 info.p = p;
964
965 mountlist_scan(getfsstat_callback, &info, MNTSCAN_FORWARD);
966 if (info.sfsp && info.count > info.maxcount)
967 uap->sysmsg_result = info.maxcount;
75ffff0d 968 else
861905fb
MD
969 uap->sysmsg_result = info.count;
970 return (info.error);
971}
972
973static int
974getfsstat_callback(struct mount *mp, void *data)
975{
976 struct getfsstat_info *info = data;
977 struct statfs *sp;
978 char *freepath;
979 char *fullpath;
980 int error;
981
982 if (info->sfsp && info->count < info->maxcount) {
983 if (info->is_chrooted && !chroot_visible_mnt(mp, info->p))
984 return(0);
985 sp = &mp->mnt_stat;
986
987 /*
988 * If MNT_NOWAIT or MNT_LAZY is specified, do not
989 * refresh the fsstat cache. MNT_NOWAIT or MNT_LAZY
990 * overrides MNT_WAIT.
991 */
992 if (((info->flags & (MNT_LAZY|MNT_NOWAIT)) == 0 ||
993 (info->flags & MNT_WAIT)) &&
994 (error = VFS_STATFS(mp, sp, info->td))) {
995 return(0);
996 }
997 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
998
999 error = cache_fullpath(info->p, mp->mnt_ncp,
1000 &fullpath, &freepath);
1001 if (error) {
1002 info->error = error;
1003 return(-1);
984263bc 1004 }
861905fb
MD
1005 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
1006 strlcpy(sp->f_mntonname, fullpath, sizeof(sp->f_mntonname));
1007 free(freepath, M_TEMP);
1008
1009 error = copyout(sp, info->sfsp, sizeof(*sp));
1010 if (error) {
1011 info->error = error;
1012 return (-1);
984263bc 1013 }
861905fb 1014 ++info->sfsp;
984263bc 1015 }
861905fb
MD
1016 info->count++;
1017 return(0);
984263bc
MD
1018}
1019
1020/*
41c20dac
MD
1021 * fchdir_args(int fd)
1022 *
984263bc
MD
1023 * Change current working directory to a given file descriptor.
1024 */
984263bc
MD
1025/* ARGSUSED */
1026int
41c20dac 1027fchdir(struct fchdir_args *uap)
984263bc 1028{
dadab5e9
MD
1029 struct thread *td = curthread;
1030 struct proc *p = td->td_proc;
41c20dac 1031 struct filedesc *fdp = p->p_fd;
21739618 1032 struct vnode *vp, *ovp;
984263bc
MD
1033 struct mount *mp;
1034 struct file *fp;
21739618
MD
1035 struct namecache *ncp, *oncp;
1036 struct namecache *nct;
984263bc
MD
1037 int error;
1038
ab2eb4eb 1039 if ((error = getvnode(fdp, uap->fd, &fp)) != 0)
984263bc
MD
1040 return (error);
1041 vp = (struct vnode *)fp->f_data;
597aea93 1042 vref(vp);
5fd012e0 1043 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
21739618 1044 if (vp->v_type != VDIR || fp->f_ncp == NULL)
984263bc
MD
1045 error = ENOTDIR;
1046 else
dadab5e9 1047 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, td);
984263bc
MD
1048 if (error) {
1049 vput(vp);
1050 return (error);
1051 }
21739618
MD
1052 ncp = cache_hold(fp->f_ncp);
1053 while (!error && (mp = vp->v_mountedhere) != NULL) {
1054 error = nlookup_mp(mp, &nct);
1055 if (error == 0) {
1056 cache_unlock(nct); /* leave ref intact */
1057 vput(vp);
1058 vp = nct->nc_vp;
5fd012e0 1059 error = vget(vp, LK_SHARED, td);
21739618
MD
1060 KKASSERT(error == 0);
1061 cache_drop(ncp);
1062 ncp = nct;
1063 }
1064 }
1065 if (error == 0) {
1066 ovp = fdp->fd_cdir;
1067 oncp = fdp->fd_ncdir;
5fd012e0 1068 VOP_UNLOCK(vp, 0, td); /* leave ref intact */
21739618
MD
1069 fdp->fd_cdir = vp;
1070 fdp->fd_ncdir = ncp;
1071 cache_drop(oncp);
1072 vrele(ovp);
1073 } else {
1074 cache_drop(ncp);
1075 vput(vp);
1076 }
1077 return (error);
984263bc
MD
1078}
1079
9697c509 1080int
21739618 1081kern_chdir(struct nlookupdata *nd)
9697c509
DRJ
1082{
1083 struct thread *td = curthread;
1084 struct proc *p = td->td_proc;
1085 struct filedesc *fdp = p->p_fd;
21739618
MD
1086 struct vnode *vp, *ovp;
1087 struct namecache *oncp;
9697c509
DRJ
1088 int error;
1089
21739618 1090 if ((error = nlookup(nd)) != 0)
9697c509 1091 return (error);
21739618
MD
1092 if ((vp = nd->nl_ncp->nc_vp) == NULL)
1093 return (ENOENT);
5fd012e0 1094 if ((error = vget(vp, LK_SHARED, td)) != 0)
21739618
MD
1095 return (error);
1096
1097 error = checkvp_chdir(vp, td);
5fd012e0 1098 VOP_UNLOCK(vp, 0, td);
21739618
MD
1099 if (error == 0) {
1100 ovp = fdp->fd_cdir;
1101 oncp = fdp->fd_ncdir;
1102 cache_unlock(nd->nl_ncp); /* leave reference intact */
1103 fdp->fd_ncdir = nd->nl_ncp;
1104 fdp->fd_cdir = vp;
1105 cache_drop(oncp);
1106 vrele(ovp);
1107 nd->nl_ncp = NULL;
1108 } else {
1109 vrele(vp);
e24b948e 1110 }
e24b948e 1111 return (error);
9697c509
DRJ
1112}
1113
984263bc 1114/*
41c20dac
MD
1115 * chdir_args(char *path)
1116 *
984263bc
MD
1117 * Change current working directory (``.'').
1118 */
984263bc 1119int
41c20dac 1120chdir(struct chdir_args *uap)
984263bc 1121{
21739618 1122 struct nlookupdata nd;
9697c509 1123 int error;
984263bc 1124
21739618 1125 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
fad57d0e 1126 if (error == 0)
21739618 1127 error = kern_chdir(&nd);
fad57d0e 1128 nlookup_done(&nd);
9697c509 1129 return (error);
984263bc
MD
1130}
1131
1132/*
1133 * Helper function for raised chroot(2) security function: Refuse if
1134 * any filedescriptors are open directories.
1135 */
1136static int
1137chroot_refuse_vdir_fds(fdp)
1138 struct filedesc *fdp;
1139{
1140 struct vnode *vp;
1141 struct file *fp;
1142 int error;
1143 int fd;
1144
1145 for (fd = 0; fd < fdp->fd_nfiles ; fd++) {
1146 error = getvnode(fdp, fd, &fp);
1147 if (error)
1148 continue;
1149 vp = (struct vnode *)fp->f_data;
1150 if (vp->v_type != VDIR)
1151 continue;
1152 return(EPERM);
1153 }
1154 return (0);
1155}
1156
1157/*
1158 * This sysctl determines if we will allow a process to chroot(2) if it
1159 * has a directory open:
1160 * 0: disallowed for all processes.
1161 * 1: allowed for processes that were not already chroot(2)'ed.
1162 * 2: allowed for all processes.
1163 */
1164
1165static int chroot_allow_open_directories = 1;
1166
1167SYSCTL_INT(_kern, OID_AUTO, chroot_allow_open_directories, CTLFLAG_RW,
1168 &chroot_allow_open_directories, 0, "");
1169
e24b948e 1170/*
21739618
MD
1171 * chroot to the specified namecache entry. We obtain the vp from the
1172 * namecache data. The passed ncp must be locked and referenced and will
1173 * remain locked and referenced on return.
e24b948e 1174 */
53dd6631
JS
1175int
1176kern_chroot(struct namecache *ncp)
e24b948e
MD
1177{
1178 struct thread *td = curthread;
1179 struct proc *p = td->td_proc;
1180 struct filedesc *fdp = p->p_fd;
21739618 1181 struct vnode *vp;
e24b948e
MD
1182 int error;
1183
1184 /*
1185 * Only root can chroot
1186 */
1187 if ((error = suser_cred(p->p_ucred, PRISON_ROOT)) != 0)
1188 return (error);
1189
1190 /*
1191 * Disallow open directory descriptors (fchdir() breakouts).
1192 */
1193 if (chroot_allow_open_directories == 0 ||
1194 (chroot_allow_open_directories == 1 && fdp->fd_rdir != rootvnode)) {
1195 if ((error = chroot_refuse_vdir_fds(fdp)) != 0)
1196 return (error);
1197 }
21739618
MD
1198 if ((vp = ncp->nc_vp) == NULL)
1199 return (ENOENT);
1200
5fd012e0 1201 if ((error = vget(vp, LK_SHARED, td)) != 0)
21739618 1202 return (error);
e24b948e
MD
1203
1204 /*
1205 * Check the validity of vp as a directory to change to and
1206 * associate it with rdir/jdir.
1207 */
21739618 1208 error = checkvp_chdir(vp, td);
5fd012e0 1209 VOP_UNLOCK(vp, 0, td); /* leave reference intact */
21739618 1210 if (error == 0) {
e24b948e 1211 vrele(fdp->fd_rdir);
21739618 1212 fdp->fd_rdir = vp; /* reference inherited by fd_rdir */
690a3127 1213 cache_drop(fdp->fd_nrdir);
21739618 1214 fdp->fd_nrdir = cache_hold(ncp);
e24b948e
MD
1215 if (fdp->fd_jdir == NULL) {
1216 fdp->fd_jdir = vp;
597aea93 1217 vref(fdp->fd_jdir);
21739618 1218 fdp->fd_njdir = cache_hold(ncp);
e24b948e 1219 }
21739618
MD
1220 } else {
1221 vrele(vp);
e24b948e
MD
1222 }
1223 return (error);
1224}
1225
984263bc 1226/*
41c20dac
MD
1227 * chroot_args(char *path)
1228 *
984263bc
MD
1229 * Change notion of root (``/'') directory.
1230 */
984263bc
MD
1231/* ARGSUSED */
1232int
41c20dac 1233chroot(struct chroot_args *uap)
984263bc 1234{
dadab5e9 1235 struct thread *td = curthread;
21739618 1236 struct nlookupdata nd;
e24b948e 1237 int error;
984263bc 1238
e24b948e 1239 KKASSERT(td->td_proc);
21739618 1240 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
53dd6631
JS
1241 if (error) {
1242 nlookup_done(&nd);
1243 return(error);
1244 }
1245 error = nlookup(&nd);
1246 if (error == 0)
1247 error = kern_chroot(nd.nl_ncp);
fad57d0e 1248 nlookup_done(&nd);
53dd6631 1249 return(error);
984263bc
MD
1250}
1251
1252/*
e24b948e
MD
1253 * Common routine for chroot and chdir. Given a locked, referenced vnode,
1254 * determine whether it is legal to chdir to the vnode. The vnode's state
1255 * is not changed by this call.
984263bc 1256 */
e24b948e
MD
1257int
1258checkvp_chdir(struct vnode *vp, struct thread *td)
984263bc 1259{
984263bc
MD
1260 int error;
1261
984263bc
MD
1262 if (vp->v_type != VDIR)
1263 error = ENOTDIR;
1264 else
e24b948e 1265 error = VOP_ACCESS(vp, VEXEC, td->td_proc->p_ucred, td);
984263bc
MD
1266 return (error);
1267}
1268
984263bc 1269int
fad57d0e 1270kern_open(struct nlookupdata *nd, int oflags, int mode, int *res)
984263bc 1271{
dadab5e9
MD
1272 struct thread *td = curthread;
1273 struct proc *p = td->td_proc;
41c20dac 1274 struct filedesc *fdp = p->p_fd;
9697c509 1275 int cmode, flags;
984263bc 1276 struct file *nfp;
fad57d0e
MD
1277 struct file *fp;
1278 struct vnode *vp;
984263bc
MD
1279 int type, indx, error;
1280 struct flock lf;
984263bc 1281
984263bc
MD
1282 if ((oflags & O_ACCMODE) == O_ACCMODE)
1283 return (EINVAL);
1284 flags = FFLAGS(oflags);
fad57d0e 1285 error = falloc(p, &nfp, NULL);
984263bc
MD
1286 if (error)
1287 return (error);
1288 fp = nfp;
9697c509 1289 cmode = ((mode &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT;
fad57d0e 1290
984263bc 1291 /*
fad57d0e
MD
1292 * XXX p_dupfd is a real mess. It allows a device to return a
1293 * file descriptor to be duplicated rather then doing the open
1294 * itself.
984263bc 1295 */
fad57d0e 1296 p->p_dupfd = -1;
21739618
MD
1297
1298 /*
fad57d0e
MD
1299 * Call vn_open() to do the lookup and assign the vnode to the
1300 * file pointer. vn_open() does not change the ref count on fp
1301 * and the vnode, on success, will be inherited by the file pointer
1302 * and unlocked.
21739618 1303 */
fad57d0e
MD
1304 nd->nl_flags |= NLC_LOCKVP;
1305 error = vn_open(nd, fp, flags, cmode);
1306 nlookup_done(nd);
984263bc 1307 if (error) {
984263bc
MD
1308 /*
1309 * handle special fdopen() case. bleh. dupfdopen() is
1310 * responsible for dropping the old contents of ofiles[indx]
1311 * if it succeeds.
fad57d0e
MD
1312 *
1313 * Note that if fsetfd() succeeds it will add a ref to fp
1314 * which represents the fd_ofiles[] assignment. We must still
1315 * drop our reference.
984263bc 1316 */
fad57d0e
MD
1317 if ((error == ENODEV || error == ENXIO) && p->p_dupfd >= 0) {
1318 if (fsetfd(p, fp, &indx) == 0) {
1319 error = dupfdopen(fdp, indx, p->p_dupfd, flags, error);
1320 if (error == 0) {
1321 *res = indx;
1322 fdrop(fp, td); /* our ref */
1323 return (0);
1324 }
1325 if (fdp->fd_ofiles[indx] == fp) {
69908319 1326 funsetfd(fdp, indx);
fad57d0e
MD
1327 fdrop(fp, td); /* fd_ofiles[] ref */
1328 }
1329 }
984263bc 1330 }
fad57d0e 1331 fdrop(fp, td); /* our ref */
984263bc
MD
1332 if (error == ERESTART)
1333 error = EINTR;
1334 return (error);
1335 }
fad57d0e
MD
1336
1337 /*
1338 * ref the vnode for ourselves so it can't be ripped out from under
1339 * is. XXX need an ND flag to request that the vnode be returned
1340 * anyway.
1341 */
1342 vp = (struct vnode *)fp->f_data;
1343 vref(vp);
1344 if ((error = fsetfd(p, fp, &indx)) != 0) {
1345 fdrop(fp, td);
1346 vrele(vp);
1347 return (error);
1348 }
1349
1350 /*
1351 * If no error occurs the vp will have been assigned to the file
1352 * pointer.
1353 */
984263bc 1354 p->p_dupfd = 0;
984263bc
MD
1355
1356 /*
1357 * There should be 2 references on the file, one from the descriptor
1358 * table, and one for us.
1359 *
1360 * Handle the case where someone closed the file (via its file
1361 * descriptor) while we were blocked. The end result should look
1362 * like opening the file succeeded but it was immediately closed.
1363 */
1364 if (fp->f_count == 1) {
1365 KASSERT(fdp->fd_ofiles[indx] != fp,
1366 ("Open file descriptor lost all refs"));
fad57d0e
MD
1367 vrele(vp);
1368 fo_close(fp, td);
dadab5e9 1369 fdrop(fp, td);
9697c509 1370 *res = indx;
984263bc
MD
1371 return 0;
1372 }
1373
984263bc
MD
1374 if (flags & (O_EXLOCK | O_SHLOCK)) {
1375 lf.l_whence = SEEK_SET;
1376 lf.l_start = 0;
1377 lf.l_len = 0;
1378 if (flags & O_EXLOCK)
1379 lf.l_type = F_WRLCK;
1380 else
1381 lf.l_type = F_RDLCK;
1382 type = F_FLOCK;
1383 if ((flags & FNONBLOCK) == 0)
1384 type |= F_WAIT;
fad57d0e 1385
984263bc
MD
1386 if ((error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type)) != 0) {
1387 /*
1388 * lock request failed. Normally close the descriptor
1389 * but handle the case where someone might have dup()d
1390 * it when we weren't looking. One reference is
1391 * owned by the descriptor array, the other by us.
1392 */
fad57d0e 1393 vrele(vp);
984263bc 1394 if (fdp->fd_ofiles[indx] == fp) {
69908319 1395 funsetfd(fdp, indx);
dadab5e9 1396 fdrop(fp, td);
984263bc 1397 }
dadab5e9 1398 fdrop(fp, td);
984263bc
MD
1399 return (error);
1400 }
984263bc
MD
1401 fp->f_flag |= FHASLOCK;
1402 }
1403 /* assert that vn_open created a backing object if one is needed */
1404 KASSERT(!vn_canvmio(vp) || VOP_GETVOBJECT(vp, NULL) == 0,
1405 ("open: vmio vnode has no backing object after vn_open"));
984263bc 1406
fad57d0e 1407 vrele(vp);
21739618 1408
984263bc
MD
1409 /*
1410 * release our private reference, leaving the one associated with the
1411 * descriptor table intact.
1412 */
dadab5e9 1413 fdrop(fp, td);
9697c509 1414 *res = indx;
984263bc
MD
1415 return (0);
1416}
1417
984263bc 1418/*
9697c509 1419 * open_args(char *path, int flags, int mode)
41c20dac 1420 *
9697c509
DRJ
1421 * Check permissions, allocate an open file structure,
1422 * and call the device open routine if any.
984263bc 1423 */
984263bc 1424int
9697c509 1425open(struct open_args *uap)
984263bc 1426{
fad57d0e 1427 struct nlookupdata nd;
9697c509
DRJ
1428 int error;
1429
fad57d0e
MD
1430 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
1431 if (error == 0) {
1432 error = kern_open(&nd, uap->flags,
1433 uap->mode, &uap->sysmsg_result);
1434 }
1435 nlookup_done(&nd);
9697c509 1436 return (error);
984263bc 1437}
984263bc 1438
984263bc 1439int
fad57d0e 1440kern_mknod(struct nlookupdata *nd, int mode, int dev)
984263bc 1441{
fad57d0e 1442 struct namecache *ncp;
dadab5e9
MD
1443 struct thread *td = curthread;
1444 struct proc *p = td->td_proc;
41c20dac 1445 struct vnode *vp;
984263bc
MD
1446 struct vattr vattr;
1447 int error;
1448 int whiteout = 0;
984263bc 1449
dadab5e9
MD
1450 KKASSERT(p);
1451
9697c509 1452 switch (mode & S_IFMT) {
984263bc
MD
1453 case S_IFCHR:
1454 case S_IFBLK:
dadab5e9 1455 error = suser(td);
984263bc
MD
1456 break;
1457 default:
dadab5e9 1458 error = suser_cred(p->p_ucred, PRISON_ROOT);
984263bc
MD
1459 break;
1460 }
1461 if (error)
1462 return (error);
fad57d0e 1463
984263bc 1464 bwillwrite();
fad57d0e
MD
1465 nd->nl_flags |= NLC_CREATE;
1466 if ((error = nlookup(nd)) != 0)
984263bc 1467 return (error);
fad57d0e
MD
1468 ncp = nd->nl_ncp;
1469 if (ncp->nc_vp)
1470 return (EEXIST);
984263bc 1471
fad57d0e
MD
1472 VATTR_NULL(&vattr);
1473 vattr.va_mode = (mode & ALLPERMS) &~ p->p_fd->fd_cmask;
1474 vattr.va_rdev = dev;
1475 whiteout = 0;
1476
1477 switch (mode & S_IFMT) {
1478 case S_IFMT: /* used by badsect to flag bad sectors */
1479 vattr.va_type = VBAD;
1480 break;
1481 case S_IFCHR:
1482 vattr.va_type = VCHR;
1483 break;
1484 case S_IFBLK:
1485 vattr.va_type = VBLK;
1486 break;
1487 case S_IFWHT:
1488 whiteout = 1;
1489 break;
1490 default:
1491 error = EINVAL;
1492 break;
984263bc 1493 }
9697c509 1494 if (error == 0) {
fad57d0e
MD
1495 if (whiteout) {
1496 error = VOP_NWHITEOUT(ncp, nd->nl_cred, NAMEI_CREATE);
1497 } else {
1498 vp = NULL;
1499 error = VOP_NMKNOD(ncp, &vp, nd->nl_cred, &vattr);
984263bc 1500 if (error == 0)
fad57d0e 1501 vput(vp);
984263bc 1502 }
984263bc 1503 }
9697c509
DRJ
1504 return (error);
1505}
1506
1507/*
1508 * mknod_args(char *path, int mode, int dev)
1509 *
1510 * Create a special file.
1511 */
1512int
1513mknod(struct mknod_args *uap)
1514{
fad57d0e 1515 struct nlookupdata nd;
9697c509
DRJ
1516 int error;
1517
fad57d0e
MD
1518 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0);
1519 if (error == 0)
1520 error = kern_mknod(&nd, uap->mode, uap->dev);
1521 nlookup_done(&nd);
984263bc
MD
1522 return (error);
1523}
1524
984263bc 1525int
fad57d0e 1526kern_mkfifo(struct nlookupdata *nd, int mode)
984263bc 1527{
fad57d0e 1528 struct namecache *ncp;
dadab5e9
MD
1529 struct thread *td = curthread;
1530 struct proc *p = td->td_proc;
984263bc 1531 struct vattr vattr;
fad57d0e 1532 struct vnode *vp;
984263bc 1533 int error;
984263bc
MD
1534
1535 bwillwrite();
fad57d0e
MD
1536
1537 nd->nl_flags |= NLC_CREATE;
1538 if ((error = nlookup(nd)) != 0)
984263bc 1539 return (error);
fad57d0e
MD
1540 ncp = nd->nl_ncp;
1541 if (ncp->nc_vp)
984263bc 1542 return (EEXIST);
fad57d0e 1543
984263bc
MD
1544 VATTR_NULL(&vattr);
1545 vattr.va_type = VFIFO;
136178b3 1546 vattr.va_mode = (mode & ALLPERMS) &~ p->p_fd->fd_cmask;
fad57d0e
MD
1547 vp = NULL;
1548 error = VOP_NMKNOD(ncp, &vp, nd->nl_cred, &vattr);
984263bc 1549 if (error == 0)
fad57d0e 1550 vput(vp);
136178b3
DRJ
1551 return (error);
1552}
1553
1554/*
1555 * mkfifo_args(char *path, int mode)
1556 *
1557 * Create a named pipe.
1558 */
1559int
1560mkfifo(struct mkfifo_args *uap)
1561{
fad57d0e 1562 struct nlookupdata nd;
136178b3
DRJ
1563 int error;
1564
fad57d0e
MD
1565 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0);
1566 if (error == 0)
1567 error = kern_mkfifo(&nd, uap->mode);
1568 nlookup_done(&nd);
984263bc
MD
1569 return (error);
1570}
1571
984263bc 1572int
fad57d0e 1573kern_link(struct nlookupdata *nd, struct nlookupdata *linknd)
984263bc 1574{
dadab5e9 1575 struct thread *td = curthread;
41c20dac 1576 struct vnode *vp;
984263bc
MD
1577 int error;
1578
fad57d0e
MD
1579 /*
1580 * Lookup the source and obtained a locked vnode.
1581 *
1582 * XXX relookup on vget failure / race ?
1583 */
984263bc 1584 bwillwrite();
fad57d0e 1585 if ((error = nlookup(nd)) != 0)
984263bc 1586 return (error);
fad57d0e
MD
1587 vp = nd->nl_ncp->nc_vp;
1588 KKASSERT(vp != NULL);
984263bc 1589 if (vp->v_type == VDIR)
fad57d0e
MD
1590 return (EPERM); /* POSIX */
1591 if ((error = vget(vp, LK_EXCLUSIVE, td)) != 0)
1592 return (error);
1593
1594 /*
1595 * Unlock the source so we can lookup the target without deadlocking
1596 * (XXX vp is locked already, possible other deadlock?). The target
1597 * must not exist.
1598 */
1599 KKASSERT(nd->nl_flags & NLC_NCPISLOCKED);
1600 nd->nl_flags &= ~NLC_NCPISLOCKED;
1601 cache_unlock(nd->nl_ncp);
1602
1603 linknd->nl_flags |= NLC_CREATE;
1604 if ((error = nlookup(linknd)) != 0) {
1605 vput(vp);
1606 return (error);
984263bc 1607 }
fad57d0e
MD
1608 if (linknd->nl_ncp->nc_vp) {
1609 vput(vp);
1610 return (EEXIST);
1611 }
1612
1613 /*
1614 * Finally run the new API VOP.
1615 */
1616 error = VOP_NLINK(linknd->nl_ncp, vp, linknd->nl_cred);
1617 vput(vp);
984263bc
MD
1618 return (error);
1619}
1620
1621/*
9697c509 1622 * link_args(char *path, char *link)
41c20dac 1623 *
9697c509 1624 * Make a hard file link.
984263bc 1625 */
984263bc 1626int
9697c509
DRJ
1627link(struct link_args *uap)
1628{
fad57d0e 1629 struct nlookupdata nd, linknd;
9697c509
DRJ
1630 int error;
1631
fad57d0e
MD
1632 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
1633 if (error == 0) {
1634 error = nlookup_init(&linknd, uap->link, UIO_USERSPACE, 0);
1635 if (error == 0)
1636 error = kern_link(&nd, &linknd);
1637 nlookup_done(&linknd);
1638 }
1639 nlookup_done(&nd);
9697c509
DRJ
1640 return (error);
1641}
1642
1643int
fad57d0e 1644kern_symlink(struct nlookupdata *nd, char *path, int mode)
984263bc 1645{
fad57d0e 1646 struct namecache *ncp;
984263bc 1647 struct vattr vattr;
fad57d0e 1648 struct vnode *vp;
984263bc 1649 int error;
984263bc 1650
984263bc 1651 bwillwrite();
fad57d0e
MD
1652 nd->nl_flags |= NLC_CREATE;
1653 if ((error = nlookup(nd)) != 0)
9697c509 1654 return (error);
fad57d0e
MD
1655 ncp = nd->nl_ncp;
1656 if (ncp->nc_vp)
9697c509 1657 return (EEXIST);
fad57d0e 1658
984263bc 1659 VATTR_NULL(&vattr);
fad57d0e
MD
1660 vattr.va_mode = mode;
1661 error = VOP_NSYMLINK(ncp, &vp, nd->nl_cred, &vattr, path);
984263bc 1662 if (error == 0)
fad57d0e 1663 vput(vp);
9697c509
DRJ
1664 return (error);
1665}
1666
1667/*
1668 * symlink(char *path, char *link)
1669 *
1670 * Make a symbolic link.
1671 */
1672int
1673symlink(struct symlink_args *uap)
1674{
1675 struct thread *td = curthread;
fad57d0e 1676 struct nlookupdata nd;
9697c509
DRJ
1677 char *path;
1678 int error;
fad57d0e 1679 int mode;
9697c509
DRJ
1680
1681 path = zalloc(namei_zone);
1682 error = copyinstr(uap->path, path, MAXPATHLEN, NULL);
e24b948e 1683 if (error == 0) {
fad57d0e
MD
1684 error = nlookup_init(&nd, uap->link, UIO_USERSPACE, 0);
1685 if (error == 0) {
1686 mode = ACCESSPERMS & ~td->td_proc->p_fd->fd_cmask;
1687 error = kern_symlink(&nd, path, mode);
1688 }
1689 nlookup_done(&nd);
e24b948e 1690 }
984263bc
MD
1691 zfree(namei_zone, path);
1692 return (error);
1693}
1694
1695/*
41c20dac
MD
1696 * undelete_args(char *path)
1697 *
984263bc
MD
1698 * Delete a whiteout from the filesystem.
1699 */
1700/* ARGSUSED */
1701int
41c20dac 1702undelete(struct undelete_args *uap)
984263bc 1703{
fad57d0e 1704 struct nlookupdata nd;
984263bc 1705 int error;
984263bc 1706
ab2eb4eb 1707 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0);
984263bc 1708 bwillwrite();
fad57d0e
MD
1709 nd.nl_flags |= NLC_DELETE;
1710 if (error == 0)
1711 error = nlookup(&nd);
b8997912 1712 if (error == 0)
fad57d0e
MD
1713 error = VOP_NWHITEOUT(nd.nl_ncp, nd.nl_cred, NAMEI_DELETE);
1714 nlookup_done(&nd);
984263bc
MD
1715 return (error);
1716}
1717
984263bc 1718int
fad57d0e 1719kern_unlink(struct nlookupdata *nd)
984263bc 1720{
fad57d0e 1721 struct namecache *ncp;
984263bc 1722 int error;
984263bc
MD
1723
1724 bwillwrite();
fad57d0e
MD
1725 nd->nl_flags |= NLC_DELETE;
1726 if ((error = nlookup(nd)) != 0)
984263bc 1727 return (error);
fad57d0e
MD
1728 ncp = nd->nl_ncp;
1729 error = VOP_NREMOVE(ncp, nd->nl_cred);
984263bc
MD
1730 return (error);
1731}
1732
1733/*
9697c509 1734 * unlink_args(char *path)
41c20dac 1735 *
9697c509 1736 * Delete a name from the filesystem.
984263bc 1737 */
984263bc 1738int
9697c509
DRJ
1739unlink(struct unlink_args *uap)
1740{
fad57d0e 1741 struct nlookupdata nd;
9697c509
DRJ
1742 int error;
1743
fad57d0e
MD
1744 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0);
1745 if (error == 0)
1746 error = kern_unlink(&nd);
1747 nlookup_done(&nd);
9697c509
DRJ
1748 return (error);
1749}
1750
1751int
5a3fe67d 1752kern_lseek(int fd, off_t offset, int whence, off_t *res)
984263bc 1753{
dadab5e9
MD
1754 struct thread *td = curthread;
1755 struct proc *p = td->td_proc;
41c20dac
MD
1756 struct filedesc *fdp = p->p_fd;
1757 struct file *fp;
984263bc
MD
1758 struct vattr vattr;
1759 int error;
1760
b463648b 1761 if ((u_int)fd >= fdp->fd_nfiles ||
9697c509 1762 (fp = fdp->fd_ofiles[fd]) == NULL)
984263bc
MD
1763 return (EBADF);
1764 if (fp->f_type != DTYPE_VNODE)
1765 return (ESPIPE);
9697c509 1766 switch (whence) {
984263bc 1767 case L_INCR:
9697c509 1768 fp->f_offset += offset;
984263bc
MD
1769 break;
1770 case L_XTND:
3b568787 1771 error=VOP_GETATTR((struct vnode *)fp->f_data, &vattr, td);
984263bc
MD
1772 if (error)
1773 return (error);
9697c509 1774 fp->f_offset = offset + vattr.va_size;
984263bc
MD
1775 break;
1776 case L_SET:
9697c509 1777 fp->f_offset = offset;
984263bc
MD
1778 break;
1779 default:
1780 return (EINVAL);
1781 }
9697c509 1782 *res = fp->f_offset;
984263bc
MD
1783 return (0);
1784}
1785
984263bc 1786/*
9697c509 1787 * lseek_args(int fd, int pad, off_t offset, int whence)
41c20dac 1788 *
9697c509 1789 * Reposition read/write file offset.
984263bc 1790 */
984263bc 1791int
9697c509 1792lseek(struct lseek_args *uap)
984263bc 1793{
984263bc
MD
1794 int error;
1795
9697c509 1796 error = kern_lseek(uap->fd, uap->offset, uap->whence,
5a3fe67d 1797 &uap->sysmsg_offset);
9697c509 1798
984263bc
MD
1799 return (error);
1800}
984263bc 1801
984263bc 1802int
fad57d0e 1803kern_access(struct nlookupdata *nd, int aflags)
984263bc 1804{
dadab5e9 1805 struct thread *td = curthread;
41c20dac 1806 struct vnode *vp;
984263bc 1807 int error, flags;
984263bc 1808
fad57d0e
MD
1809 if ((error = nlookup(nd)) != 0)
1810 return (error);
806dcf9a 1811retry:
fad57d0e 1812 error = cache_vget(nd->nl_ncp, nd->nl_cred, LK_EXCLUSIVE, &vp);
9697c509 1813 if (error)
fad57d0e 1814 return (error);
984263bc
MD
1815
1816 /* Flags == 0 means only check for existence. */
9697c509 1817 if (aflags) {
984263bc 1818 flags = 0;
9697c509 1819 if (aflags & R_OK)
984263bc 1820 flags |= VREAD;
9697c509 1821 if (aflags & W_OK)
984263bc 1822 flags |= VWRITE;
9697c509 1823 if (aflags & X_OK)
984263bc
MD
1824 flags |= VEXEC;
1825 if ((flags & VWRITE) == 0 || (error = vn_writechk(vp)) == 0)
fad57d0e 1826 error = VOP_ACCESS(vp, flags, nd->nl_cred, td);
806dcf9a
MD
1827
1828 /*
1829 * If the file handle is stale we have to re-resolve the
1830 * entry. This is a hack at the moment.
1831 */
1832 if (error == ESTALE) {
1833 cache_setunresolved(nd->nl_ncp);
1834 error = cache_resolve(nd->nl_ncp, nd->nl_cred);
1835 if (error == 0) {
1836 vput(vp);
1837 vp = NULL;
1838 goto retry;
1839 }
1840 }
984263bc 1841 }
984263bc 1842 vput(vp);
984263bc
MD
1843 return (error);
1844}
1845
984263bc 1846/*
9697c509 1847 * access_args(char *path, int flags)
41c20dac 1848 *
9697c509 1849 * Check access permissions.
984263bc 1850 */
984263bc 1851int
9697c509 1852access(struct access_args *uap)
984263bc 1853{
fad57d0e 1854 struct nlookupdata nd;
9697c509 1855 int error;
984263bc 1856
fad57d0e
MD
1857 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
1858 if (error == 0)
1859 error = kern_access(&nd, uap->flags);
1860 nlookup_done(&nd);
984263bc
MD
1861 return (error);
1862}
1863
984263bc 1864int
21739618 1865kern_stat(struct nlookupdata *nd, struct stat *st)
984263bc 1866{
984263bc 1867 int error;
21739618
MD
1868 struct vnode *vp;
1869 thread_t td;
984263bc 1870
21739618 1871 if ((error = nlookup(nd)) != 0)
984263bc 1872 return (error);
806dcf9a 1873again:
21739618
MD
1874 if ((vp = nd->nl_ncp->nc_vp) == NULL)
1875 return (ENOENT);
1876
1877 td = curthread;
5fd012e0 1878 if ((error = vget(vp, LK_SHARED, td)) != 0)
21739618
MD
1879 return (error);
1880 error = vn_stat(vp, st, td);
806dcf9a
MD
1881
1882 /*
1883 * If the file handle is stale we have to re-resolve the entry. This
1884 * is a hack at the moment.
1885 */
1886 if (error == ESTALE) {
1887 cache_setunresolved(nd->nl_ncp);
1888 error = cache_resolve(nd->nl_ncp, nd->nl_cred);
1889 if (error == 0) {
1890 vput(vp);
1891 goto again;
1892 }
1893 }
21739618 1894 vput(vp);
984263bc
MD
1895 return (error);
1896}
1897
984263bc 1898/*
41c20dac
MD
1899 * stat_args(char *path, struct stat *ub)
1900 *
984263bc
MD
1901 * Get file status; this version follows links.
1902 */
984263bc 1903int
41c20dac 1904stat(struct stat_args *uap)
984263bc 1905{
21739618 1906 struct nlookupdata nd;
9697c509
DRJ
1907 struct stat st;
1908 int error;
984263bc 1909
21739618
MD
1910 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
1911 if (error == 0) {
1912 error = kern_stat(&nd, &st);
1913 if (error == 0)
1914 error = copyout(&st, uap->ub, sizeof(*uap->ub));
21739618 1915 }
fad57d0e 1916 nlookup_done(&nd);
984263bc
MD
1917 return (error);
1918}
1919
1920/*
41c20dac
MD
1921 * lstat_args(char *path, struct stat *ub)
1922 *
984263bc
MD
1923 * Get file status; this version does not follow links.
1924 */
984263bc 1925int
41c20dac 1926lstat(struct lstat_args *uap)
984263bc 1927{
21739618 1928 struct nlookupdata nd;
9697c509
DRJ
1929 struct stat st;
1930 int error;
984263bc 1931
21739618
MD
1932 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0);
1933 if (error == 0) {
1934 error = kern_stat(&nd, &st);
1935 if (error == 0)
1936 error = copyout(&st, uap->ub, sizeof(*uap->ub));
21739618 1937 }
fad57d0e 1938 nlookup_done(&nd);
984263bc
MD
1939 return (error);
1940}
1941
1942void
1943cvtnstat(sb, nsb)
1944 struct stat *sb;
1945 struct nstat *nsb;
1946{
1947 nsb->st_dev = sb->st_dev;
1948 nsb->st_ino = sb->st_ino;
1949 nsb->st_mode = sb->st_mode;
1950 nsb->st_nlink = sb->st_nlink;
1951 nsb->st_uid = sb->st_uid;
1952 nsb->st_gid = sb->st_gid;
1953 nsb->st_rdev = sb->st_rdev;
1954 nsb->st_atimespec = sb->st_atimespec;
1955 nsb->st_mtimespec = sb->st_mtimespec;
1956 nsb->st_ctimespec = sb->st_ctimespec;
1957 nsb->st_size = sb->st_size;
1958 nsb->st_blocks = sb->st_blocks;
1959 nsb->st_blksize = sb->st_blksize;
1960 nsb->st_flags = sb->st_flags;
1961 nsb->st_gen = sb->st_gen;
1962 nsb->st_qspare[0] = sb->st_qspare[0];
1963 nsb->st_qspare[1] = sb->st_qspare[1];
1964}
1965
41c20dac
MD
1966/*
1967 * nstat_args(char *path, struct nstat *ub)
1968 */
984263bc
MD
1969/* ARGSUSED */
1970int
41c20dac 1971nstat(struct nstat_args *uap)
984263bc 1972{
dadab5e9 1973 struct thread *td = curthread;
fad57d0e 1974 struct vnode *vp;
984263bc
MD
1975 struct stat sb;
1976 struct nstat nsb;
fad57d0e 1977 struct nlookupdata nd;
984263bc 1978 int error;
984263bc 1979
fad57d0e 1980 vp = NULL;
ab2eb4eb 1981 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
fad57d0e
MD
1982 if (error == 0)
1983 error = nlookup(&nd);
1984 if (error == 0)
1985 error = cache_vget(nd.nl_ncp, nd.nl_cred, LK_EXCLUSIVE, &vp);
1986 nlookup_done(&nd);
1987 if (error == 0) {
1988 error = vn_stat(vp, &sb, td);
1989 vput(vp);
1990 if (error == 0) {
1991 cvtnstat(&sb, &nsb);
ab2eb4eb 1992 error = copyout(&nsb, uap->ub, sizeof(nsb));
fad57d0e
MD
1993 }
1994 }
1995 return (error);
984263bc
MD
1996}
1997
1998/*
41c20dac
MD
1999 * lstat_args(char *path, struct stat *ub)
2000 *
984263bc
MD
2001 * Get file status; this version does not follow links.
2002 */
984263bc
MD
2003/* ARGSUSED */
2004int
41c20dac 2005nlstat(struct nlstat_args *uap)
984263bc 2006{
dadab5e9 2007 struct thread *td = curthread;
984263bc
MD
2008 struct vnode *vp;
2009 struct stat sb;
2010 struct nstat nsb;
fad57d0e
MD
2011 struct nlookupdata nd;
2012 int error;
984263bc 2013
fad57d0e 2014 vp = NULL;
ab2eb4eb 2015 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0);
fad57d0e
MD
2016 if (error == 0)
2017 error = nlookup(&nd);
2018 if (error == 0)
2019 error = cache_vget(nd.nl_ncp, nd.nl_cred, LK_EXCLUSIVE, &vp);
2020 nlookup_done(&nd);
2021 if (error == 0) {
2022 error = vn_stat(vp, &sb, td);
2023 vput(vp);
2024 if (error == 0) {
2025 cvtnstat(&sb, &nsb);
ab2eb4eb 2026 error = copyout(&nsb, uap->ub, sizeof(nsb));
fad57d0e
MD
2027 }
2028 }
984263bc
MD
2029 return (error);
2030}
2031
2032/*
41c20dac
MD
2033 * pathconf_Args(char *path, int name)
2034 *
984263bc
MD
2035 * Get configurable pathname variables.
2036 */
984263bc
MD
2037/* ARGSUSED */
2038int
41c20dac 2039pathconf(struct pathconf_args *uap)
984263bc 2040{
fad57d0e
MD
2041 struct nlookupdata nd;
2042 struct vnode *vp;
984263bc 2043 int error;
984263bc 2044
fad57d0e 2045 vp = NULL;
ab2eb4eb 2046 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
fad57d0e
MD
2047 if (error == 0)
2048 error = nlookup(&nd);
2049 if (error == 0)
2050 error = cache_vget(nd.nl_ncp, nd.nl_cred, LK_EXCLUSIVE, &vp);
2051 nlookup_done(&nd);
2052 if (error == 0) {
ab2eb4eb 2053 error = VOP_PATHCONF(vp, uap->name, uap->sysmsg_fds);
fad57d0e
MD
2054 vput(vp);
2055 }
984263bc
MD
2056 return (error);
2057}
2058
bbab27f6
DRJ
2059/*
2060 * XXX: daver
2061 * kern_readlink isn't properly split yet. There is a copyin burried
2062 * in VOP_READLINK().
2063 */
984263bc 2064int
fad57d0e 2065kern_readlink(struct nlookupdata *nd, char *buf, int count, int *res)
984263bc 2066{
dadab5e9
MD
2067 struct thread *td = curthread;
2068 struct proc *p = td->td_proc;
41c20dac 2069 struct vnode *vp;
984263bc
MD
2070 struct iovec aiov;
2071 struct uio auio;
2072 int error;
984263bc 2073
fad57d0e
MD
2074 if ((error = nlookup(nd)) != 0)
2075 return (error);
2076 error = cache_vget(nd->nl_ncp, nd->nl_cred, LK_EXCLUSIVE, &vp);
9697c509 2077 if (error)
984263bc 2078 return (error);
fad57d0e 2079 if (vp->v_type != VLNK) {
984263bc 2080 error = EINVAL;
fad57d0e 2081 } else {
9697c509
DRJ
2082 aiov.iov_base = buf;
2083 aiov.iov_len = count;
984263bc
MD
2084 auio.uio_iov = &aiov;
2085 auio.uio_iovcnt = 1;
2086 auio.uio_offset = 0;
2087 auio.uio_rw = UIO_READ;
2088 auio.uio_segflg = UIO_USERSPACE;
dadab5e9 2089 auio.uio_td = td;
9697c509 2090 auio.uio_resid = count;
984263bc
MD
2091 error = VOP_READLINK(vp, &auio, p->p_ucred);
2092 }
2093 vput(vp);
9697c509
DRJ
2094 *res = count - auio.uio_resid;
2095 return (error);
2096}
2097
2098/*
2099 * readlink_args(char *path, char *buf, int count)
2100 *
2101 * Return target name of a symbolic link.
2102 */
2103int
2104readlink(struct readlink_args *uap)
2105{
fad57d0e 2106 struct nlookupdata nd;
9697c509
DRJ
2107 int error;
2108
fad57d0e
MD
2109 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0);
2110 if (error == 0) {
2111 error = kern_readlink(&nd, uap->buf, uap->count,
2112 &uap->sysmsg_result);
2113 }
2114 nlookup_done(&nd);
984263bc
MD
2115 return (error);
2116}
2117
2118static int
41c20dac 2119setfflags(struct vnode *vp, int flags)
984263bc 2120{
dadab5e9
MD
2121 struct thread *td = curthread;
2122 struct proc *p = td->td_proc;
984263bc
MD
2123 int error;
2124 struct vattr vattr;
2125
2126 /*
2127 * Prevent non-root users from setting flags on devices. When
2128 * a device is reused, users can retain ownership of the device
2129 * if they are allowed to set flags and programs assume that
2130 * chown can't fail when done as root.
2131 */
2132 if ((vp->v_type == VCHR || vp->v_type == VBLK) &&
dadab5e9 2133 ((error = suser_cred(p->p_ucred, PRISON_ROOT)) != 0))
984263bc
MD
2134 return (error);
2135
186fccd6
MD
2136 /*
2137 * note: vget is required for any operation that might mod the vnode
2138 * so VINACTIVE is properly cleared.
2139 */
dadab5e9 2140 VOP_LEASE(vp, td, p->p_ucred, LEASE_WRITE);
186fccd6
MD
2141 if ((error = vget(vp, LK_EXCLUSIVE, td)) == 0) {
2142 VATTR_NULL(&vattr);
2143 vattr.va_flags = flags;
2144 error = VOP_SETATTR(vp, &vattr, p->p_ucred, td);
2145 vput(vp);
2146 }
984263bc
MD
2147 return (error);
2148}
2149
2150/*
41c20dac
MD
2151 * chflags(char *path, int flags)
2152 *
984263bc
MD
2153 * Change flags of a file given a path name.
2154 */
984263bc
MD
2155/* ARGSUSED */
2156int
41c20dac 2157chflags(struct chflags_args *uap)
984263bc 2158{
fad57d0e
MD
2159 struct nlookupdata nd;
2160 struct vnode *vp;
984263bc 2161 int error;
984263bc 2162
fad57d0e 2163 vp = NULL;
ab2eb4eb 2164 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
fad57d0e
MD
2165 /* XXX Add NLC flag indicating modifying operation? */
2166 if (error == 0)
2167 error = nlookup(&nd);
2168 if (error == 0)
2169 error = cache_vref(nd.nl_ncp, nd.nl_cred, &vp);
2170 nlookup_done(&nd);
2171 if (error == 0) {
ab2eb4eb 2172 error = setfflags(vp, uap->flags);
fad57d0e
MD
2173 vrele(vp);
2174 }
2175 return (error);
984263bc
MD
2176}
2177
2178/*
41c20dac
MD
2179 * fchflags_args(int fd, int flags)
2180 *
984263bc
MD
2181 * Change flags of a file given a file descriptor.
2182 */
984263bc
MD
2183/* ARGSUSED */
2184int
41c20dac 2185fchflags(struct fchflags_args *uap)
984263bc 2186{
dadab5e9
MD
2187 struct thread *td = curthread;
2188 struct proc *p = td->td_proc;
984263bc
MD
2189 struct file *fp;
2190 int error;
2191
ab2eb4eb 2192 if ((error = getvnode(p->p_fd, uap->fd, &fp)) != 0)
984263bc 2193 return (error);
ab2eb4eb 2194 return setfflags((struct vnode *) fp->f_data, uap->flags);
984263bc
MD
2195}
2196
2197static int
41c20dac 2198setfmode(struct vnode *vp, int mode)
984263bc 2199{
dadab5e9
MD
2200 struct thread *td = curthread;
2201 struct proc *p = td->td_proc;
984263bc
MD
2202 int error;
2203 struct vattr vattr;
2204
186fccd6
MD
2205 /*
2206 * note: vget is required for any operation that might mod the vnode
2207 * so VINACTIVE is properly cleared.
2208 */
dadab5e9 2209 VOP_LEASE(vp, td, p->p_ucred, LEASE_WRITE);
186fccd6
MD
2210 if ((error = vget(vp, LK_EXCLUSIVE, td)) == 0) {
2211 VATTR_NULL(&vattr);
2212 vattr.va_mode = mode & ALLPERMS;
2213 error = VOP_SETATTR(vp, &vattr, p->p_ucred, td);
2214 vput(vp);
2215 }
984263bc
MD
2216 return error;
2217}
2218
9697c509 2219int
fad57d0e 2220kern_chmod(struct nlookupdata *nd, int mode)
9697c509 2221{
fad57d0e 2222 struct vnode *vp;
9697c509
DRJ
2223 int error;
2224
fad57d0e
MD
2225 /* XXX Add NLC flag indicating modifying operation? */
2226 if ((error = nlookup(nd)) != 0)
9697c509 2227 return (error);
fad57d0e
MD
2228 if ((error = cache_vref(nd->nl_ncp, nd->nl_cred, &vp)) != 0)
2229 return (error);
2230 error = setfmode(vp, mode);
2231 vrele(vp);
2232 return (error);
9697c509
DRJ
2233}
2234
984263bc 2235/*
41c20dac
MD
2236 * chmod_args(char *path, int mode)
2237 *
984263bc
MD
2238 * Change mode of a file given path name.
2239 */
984263bc
MD
2240/* ARGSUSED */
2241int
41c20dac 2242chmod(struct chmod_args *uap)
984263bc 2243{
fad57d0e 2244 struct nlookupdata nd;
9697c509 2245 int error;
984263bc 2246
fad57d0e
MD
2247 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
2248 if (error == 0)
2249 error = kern_chmod(&nd, uap->mode);
2250 nlookup_done(&nd);
9697c509 2251 return (error);
984263bc
MD
2252}
2253
2254/*
41c20dac
MD
2255 * lchmod_args(char *path, int mode)
2256 *
984263bc
MD
2257 * Change mode of a file given path name (don't follow links.)
2258 */
984263bc
MD
2259/* ARGSUSED */
2260int
41c20dac 2261lchmod(struct lchmod_args *uap)
984263bc 2262{
fad57d0e 2263 struct nlookupdata nd;
984263bc 2264 int error;
984263bc 2265
fad57d0e
MD
2266 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0);
2267 if (error == 0)
2268 error = kern_chmod(&nd, uap->mode);
2269 nlookup_done(&nd);
2270 return (error);
984263bc
MD
2271}
2272
2273/*
41c20dac
MD
2274 * fchmod_args(int fd, int mode)
2275 *
984263bc
MD
2276 * Change mode of a file given a file descriptor.
2277 */
984263bc
MD
2278/* ARGSUSED */
2279int
41c20dac 2280fchmod(struct fchmod_args *uap)
984263bc 2281{
dadab5e9
MD
2282 struct thread *td = curthread;
2283 struct proc *p = td->td_proc;
984263bc
MD
2284 struct file *fp;
2285 int error;
2286
ab2eb4eb 2287 if ((error = getvnode(p->p_fd, uap->fd, &fp)) != 0)
984263bc 2288 return (error);
ab2eb4eb 2289 return setfmode((struct vnode *)fp->f_data, uap->mode);
984263bc
MD
2290}
2291
2292static int
41c20dac 2293setfown(struct vnode *vp, uid_t uid, gid_t gid)
984263bc 2294{
dadab5e9
MD
2295 struct thread *td = curthread;
2296 struct proc *p = td->td_proc;
984263bc
MD
2297 int error;
2298 struct vattr vattr;
2299
186fccd6
MD
2300 /*
2301 * note: vget is required for any operation that might mod the vnode
2302 * so VINACTIVE is properly cleared.
2303 */
dadab5e9 2304 VOP_LEASE(vp, td, p->p_ucred, LEASE_WRITE);
186fccd6
MD
2305 if ((error = vget(vp, LK_EXCLUSIVE, td)) == 0) {
2306 VATTR_NULL(&vattr);
2307 vattr.va_uid = uid;
2308 vattr.va_gid = gid;
2309 error = VOP_SETATTR(vp, &vattr, p->p_ucred, td);
2310 vput(vp);
2311 }
984263bc
MD
2312 return error;
2313}
2314
9697c509 2315int
fad57d0e 2316kern_chown(struct nlookupdata *nd, int uid, int gid)
9697c509 2317{
fad57d0e 2318 struct vnode *vp;
9697c509
DRJ
2319 int error;
2320
fad57d0e
MD
2321 /* XXX Add NLC flag indicating modifying operation? */
2322 if ((error = nlookup(nd)) != 0)
9697c509 2323 return (error);
fad57d0e
MD
2324 if ((error = cache_vref(nd->nl_ncp, nd->nl_cred, &vp)) != 0)
2325 return (error);
2326 error = setfown(vp, uid, gid);
2327 vrele(vp);
9697c509
DRJ
2328 return (error);
2329}
2330
984263bc 2331/*
41c20dac
MD
2332 * chown(char *path, int uid, int gid)
2333 *
984263bc
MD
2334 * Set ownership given a path name.
2335 */
984263bc 2336int
41c20dac 2337chown(struct chown_args *uap)
984263bc 2338{
fad57d0e 2339 struct nlookupdata nd;
9697c509
DRJ
2340 int error;
2341
fad57d0e
MD
2342 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
2343 if (error == 0)
2344 error = kern_chown(&nd, uap->uid, uap->gid);
2345 nlookup_done(&nd);
984263bc
MD
2346 return (error);
2347}
2348
2349/*
41c20dac
MD
2350 * lchown_args(char *path, int uid, int gid)
2351 *
984263bc
MD
2352 * Set ownership given a path name, do not cross symlinks.
2353 */
984263bc 2354int
41c20dac 2355lchown(struct lchown_args *uap)
984263bc 2356{
fad57d0e 2357 struct nlookupdata nd;
984263bc 2358 int error;
9697c509 2359
fad57d0e
MD
2360 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0);
2361 if (error == 0)
2362 error = kern_chown(&nd, uap->uid, uap->gid);
2363 nlookup_done(&nd);
984263bc
MD
2364 return (error);
2365}
2366
2367/*
41c20dac
MD
2368 * fchown_args(int fd, int uid, int gid)
2369 *
984263bc
MD
2370 * Set ownership given a file descriptor.
2371 */
984263bc
MD
2372/* ARGSUSED */
2373int
41c20dac 2374fchown(struct fchown_args *uap)
984263bc 2375{
dadab5e9
MD
2376 struct thread *td = curthread;
2377 struct proc *p = td->td_proc;
984263bc
MD
2378 struct file *fp;
2379 int error;
2380
ab2eb4eb 2381 if ((error = getvnode(p->p_fd, uap->fd, &fp)) != 0)
984263bc 2382 return (error);
41c20dac 2383 return setfown((struct vnode *)fp->f_data,
ab2eb4eb 2384 uap->uid, uap->gid);
984263bc
MD
2385}
2386
2387static int
9697c509 2388getutimes(const struct timeval *tvp, struct timespec *tsp)
984263bc
MD
2389{
2390 struct timeval tv[2];
984263bc 2391
9697c509 2392 if (tvp == NULL) {
984263bc
MD
2393 microtime(&tv[0]);
2394 TIMEVAL_TO_TIMESPEC(&tv[0], &tsp[0]);
2395 tsp[1] = tsp[0];
2396 } else {
9697c509
DRJ
2397 TIMEVAL_TO_TIMESPEC(&tvp[0], &tsp[0]);
2398 TIMEVAL_TO_TIMESPEC(&tvp[1], &tsp[1]);
984263bc
MD
2399 }
2400 return 0;
2401}
2402
2403static int
41c20dac 2404setutimes(struct vnode *vp, const struct timespec *ts, int nullflag)
984263bc 2405{
dadab5e9
MD
2406 struct thread *td = curthread;
2407 struct proc *p = td->td_proc;
984263bc
MD
2408 int error;
2409 struct vattr vattr;
2410
186fccd6
MD
2411 /*
2412 * note: vget is required for any operation that might mod the vnode
2413 * so VINACTIVE is properly cleared.
2414 */
dadab5e9 2415 VOP_LEASE(vp, td, p->p_ucred, LEASE_WRITE);
186fccd6
MD
2416 if ((error = vget(vp, LK_EXCLUSIVE, td)) == 0) {
2417 VATTR_NULL(&vattr);
2418 vattr.va_atime = ts[0];
2419 vattr.va_mtime = ts[1];
2420 if (nullflag)
2421 vattr.va_vaflags |= VA_UTIMES_NULL;
2422 error = VOP_SETATTR(vp, &vattr, p->p_ucred, td);
2423 vput(vp);
2424 }
984263bc
MD
2425 return error;
2426}
2427
9697c509 2428int
fad57d0e 2429kern_utimes(struct nlookupdata *nd, struct timeval *tptr)
9697c509
DRJ
2430{
2431 struct timespec ts[2];
fad57d0e 2432 struct vnode *vp;
9697c509
DRJ
2433 int error;
2434
fad57d0e 2435 if ((error = getutimes(tptr, ts)) != 0)
9697c509 2436 return (error);
fad57d0e
MD
2437 /* XXX Add NLC flag indicating modifying operation? */
2438 if ((error = nlookup(nd)) != 0)
9697c509 2439 return (error);
fad57d0e
MD
2440 if ((error = cache_vref(nd->nl_ncp, nd->nl_cred, &vp)) != 0)
2441 return (error);
2442 error = setutimes(vp, ts, tptr == NULL);
2443 vrele(vp);
9697c509
DRJ
2444 return (error);
2445}
2446
984263bc 2447/*
41c20dac
MD
2448 * utimes_args(char *path, struct timeval *tptr)
2449 *
984263bc
MD
2450 * Set the access and modification times of a file.
2451 */
984263bc 2452int
41c20dac 2453utimes(struct utimes_args *uap)
984263bc 2454{
9697c509 2455 struct timeval tv[2];
fad57d0e 2456 struct nlookupdata nd;
9697c509
DRJ
2457 int error;
2458
2459 if (uap->tptr) {
2460 error = copyin(uap->tptr, tv, sizeof(tv));
2461 if (error)
2462 return (error);
2463 }
fad57d0e
MD
2464 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
2465 if (error == 0)
2466 error = kern_utimes(&nd, uap->tptr ? tv : NULL);
2467 nlookup_done(&nd);
984263bc
MD
2468 return (error);
2469}
2470
2471/*
41c20dac
MD
2472 * lutimes_args(char *path, struct timeval *tptr)
2473 *
984263bc
MD
2474 * Set the access and modification times of a file.
2475 */
984263bc 2476int
41c20dac 2477lutimes(struct lutimes_args *uap)
984263bc 2478{
9697c509 2479 struct timeval tv[2];
fad57d0e 2480 struct nlookupdata nd;
9697c509
DRJ
2481 int error;
2482
2483 if (uap->tptr) {
2484 error = copyin(uap->tptr, tv, sizeof(tv));
2485 if (error)
2486 return (error);
2487 }
fad57d0e
MD
2488 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0);
2489 if (error == 0)
2490 error = kern_utimes(&nd, uap->tptr ? tv : NULL);
2491 nlookup_done(&nd);
984263bc
MD
2492 return (error);
2493}
2494
984263bc 2495int
9697c509 2496kern_futimes(int fd, struct timeval *tptr)
984263bc 2497{
dadab5e9
MD
2498 struct thread *td = curthread;
2499 struct proc *p = td->td_proc;
984263bc
MD
2500 struct timespec ts[2];
2501 struct file *fp;
984263bc
MD
2502 int error;
2503
9697c509
DRJ
2504 error = getutimes(tptr, ts);
2505 if (error)
984263bc 2506 return (error);
9697c509
DRJ
2507 error = getvnode(p->p_fd, fd, &fp);
2508 if (error)
984263bc 2509 return (error);
9697c509
DRJ
2510 error = setutimes((struct vnode *)fp->f_data, ts, tptr == NULL);
2511 return (error);
984263bc
MD
2512}
2513
2514/*
9697c509 2515 * futimes_args(int fd, struct timeval *tptr)
41c20dac 2516 *
9697c509 2517 * Set the access and modification times of a file.
984263bc 2518 */
984263bc 2519int
9697c509
DRJ
2520futimes(struct futimes_args *uap)
2521{
2522 struct timeval tv[2];
2523 int error;
2524
2525 if (uap->tptr) {
2526 error = copyin(uap->tptr, tv, sizeof(tv));
2527 if (error)
2528 return (error);
2529 }
2530
b651c485 2531 error = kern_futimes(uap->fd, uap->tptr ? tv : NULL);
9697c509
DRJ
2532
2533 return (error);
2534}
2535
2536int
fad57d0e 2537kern_truncate(struct nlookupdata *nd, off_t length)
984263bc 2538{
41c20dac 2539 struct vnode *vp;
984263bc
MD
2540 struct vattr vattr;
2541 int error;
984263bc 2542
9697c509 2543 if (length < 0)
984263bc 2544 return(EINVAL);
fad57d0e
MD
2545 /* XXX Add NLC flag indicating modifying operation? */
2546 if ((error = nlookup(nd)) != 0)
984263bc 2547 return (error);
fad57d0e
MD
2548 if ((error = cache_vref(nd->nl_ncp, nd->nl_cred, &vp)) != 0)
2549 return (error);
2550 VOP_LEASE(vp, nd->nl_td, nd->nl_cred, LEASE_WRITE);
2551 if ((error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, nd->nl_td)) != 0) {
2552 vrele(vp);
2553 return (error);
2554 }
2555 if (vp->v_type == VDIR) {
984263bc 2556 error = EISDIR;
fad57d0e
MD
2557 } else if ((error = vn_writechk(vp)) == 0 &&
2558 (error = VOP_ACCESS(vp, VWRITE, nd->nl_cred, nd->nl_td)) == 0) {
984263bc 2559 VATTR_NULL(&vattr);
9697c509 2560 vattr.va_size = length;
fad57d0e 2561 error = VOP_SETATTR(vp, &vattr, nd->nl_cred, nd->nl_td);
984263bc
MD
2562 }
2563 vput(vp);
2564 return (error);
2565}
2566
9697c509
DRJ
2567/*
2568 * truncate(char *path, int pad, off_t length)
2569 *
2570 * Truncate a file given its path name.
2571 */
2572int
2573truncate(struct truncate_args *uap)
2574{
fad57d0e 2575 struct nlookupdata nd;
9697c509
DRJ
2576 int error;
2577
fad57d0e
MD
2578 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
2579 if (error == 0)
2580 error = kern_truncate(&nd, uap->length);
2581 nlookup_done(&nd);
9697c509
DRJ
2582 return error;
2583}
2584
984263bc 2585int
8f6f8622 2586kern_ftruncate(int fd, off_t length)
984263bc 2587{
dadab5e9
MD
2588 struct thread *td = curthread;
2589 struct proc *p = td->td_proc;
984263bc
MD
2590 struct vattr vattr;
2591 struct vnode *vp;
2592 struct file *fp;
2593 int error;
2594
8f6f8622 2595 if (length < 0)
984263bc 2596 return(EINVAL);
8f6f8622 2597 if ((error = getvnode(p->p_fd, fd, &fp)) != 0)
984263bc
MD
2598 return (error);
2599 if ((fp->f_flag & FWRITE) == 0)
2600 return (EINVAL);
2601 vp = (struct vnode *)fp->f_data;
dadab5e9 2602 VOP_LEASE(vp, td, p->p_ucred, LEASE_WRITE);
5fd012e0 2603 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
984263bc
MD
2604 if (vp->v_type == VDIR)
2605 error = EISDIR;
2606 else if ((error = vn_writechk(vp)) == 0) {
2607 VATTR_NULL(&vattr);
8f6f8622 2608 vattr.va_size = length;
dadab5e9 2609 error = VOP_SETATTR(vp, &vattr, fp->f_cred, td);
984263bc 2610 }
5fd012e0 2611 VOP_UNLOCK(vp, 0, td);
984263bc
MD
2612 return (error);
2613}
2614
984263bc 2615/*
8f6f8622 2616 * ftruncate_args(int fd, int pad, off_t length)
41c20dac 2617 *
8f6f8622 2618 * Truncate a file given a file descriptor.
984263bc 2619 */
984263bc 2620int
8f6f8622 2621ftruncate(struct ftruncate_args *uap)
984263bc 2622{
8f6f8622 2623 int error;
984263bc 2624
8f6f8622
DRJ
2625 error = kern_ftruncate(uap->fd, uap->length);
2626
2627 return (error);
984263bc
MD
2628}
2629
984263bc 2630/*
41c20dac
MD
2631 * fsync(int fd)
2632 *
984263bc
MD
2633 * Sync an open file.
2634 */
984263bc
MD
2635/* ARGSUSED */
2636int
41c20dac 2637fsync(struct fsync_args *uap)
984263bc 2638{
dadab5e9
MD
2639 struct thread *td = curthread;
2640 struct proc *p = td->td_proc;
41c20dac 2641 struct vnode *vp;
984263bc
MD
2642 struct file *fp;
2643 vm_object_t obj;
2644 int error;
2645
ab2eb4eb 2646 if ((error = getvnode(p->p_fd, uap->fd, &fp)) != 0)
984263bc
MD
2647 return (error);
2648 vp = (struct vnode *)fp->f_data;
5fd012e0 2649 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
984263bc
MD
2650 if (VOP_GETVOBJECT(vp, &obj) == 0)
2651 vm_object_page_clean(obj, 0, 0, 0);
3b568787 2652 if ((error = VOP_FSYNC(vp, MNT_WAIT, td)) == 0 &&
984263bc
MD
2653 vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP) &&
2654 bioops.io_fsync)
2655 error = (*bioops.io_fsync)(vp);
5fd012e0 2656 VOP_UNLOCK(vp, 0, td);
984263bc
MD
2657 return (error);
2658}
2659
984263bc 2660int
fad57d0e 2661kern_rename(struct nlookupdata *fromnd, struct nlookupdata *tond)
984263bc 2662{
fad57d0e
MD
2663 struct namecache *fncpd;
2664 struct namecache *tncpd;
2665 struct namecache *ncp;
2666 struct mount *mp;
984263bc
MD
2667 int error;
2668
2669 bwillwrite();
fad57d0e 2670 if ((error = nlookup(fromnd)) != 0)
984263bc 2671 return (error);
fad57d0e
MD
2672 if ((fncpd = fromnd->nl_ncp->nc_parent) == NULL)
2673 return (ENOENT);
2674 cache_hold(fncpd);
2675
2676 /*
2677 * unlock the source ncp so we can lookup the target ncp without
2678 * deadlocking. The target may or may not exist so we do not check
2679 * for a target vp like kern_mkdir() and other creation functions do.
2680 *
2681 * The source and target directories are ref'd and rechecked after
2682 * everything is relocked to determine if the source or target file
2683 * has been renamed.
2684 */
2685 KKASSERT(fromnd->nl_flags & NLC_NCPISLOCKED);
2686 fromnd->nl_flags &= ~NLC_NCPISLOCKED;
2687 cache_unlock(fromnd->nl_ncp);
2688
2689 tond->nl_flags |= NLC_CREATE;
2690 if ((error = nlookup(tond)) != 0) {
2691 cache_drop(fncpd);
2692 return (error);
2693 }
2694 if ((tncpd = tond->nl_ncp->nc_parent) == NULL) {
2695 cache_drop(fncpd);
2696 return (ENOENT);
2697 }
2698 cache_hold(tncpd);
2699
2700 /*
2701 * If the source and target are the same there is nothing to do
2702 */
2703 if (fromnd->nl_ncp == tond->nl_ncp) {
2704 cache_drop(fncpd);
2705 cache_drop(tncpd);
2706 return (0);
2707 }
2708
2709 /*
2710 * relock the source ncp
2711 */
2712 if (cache_lock_nonblock(fromnd->nl_ncp) == 0) {
2713 cache_resolve(fromnd->nl_ncp, fromnd->nl_cred);
2714 } else if (fromnd->nl_ncp > tond->nl_ncp) {
2715 cache_lock(fromnd->nl_ncp);
2716 cache_resolve(fromnd->nl_ncp, fromnd->nl_cred);
2717 } else {
2718 cache_unlock(tond->nl_ncp);
2719 cache_lock(fromnd->nl_ncp);
2720 cache_resolve(fromnd->nl_ncp, fromnd->nl_cred);
2721 cache_lock(tond->nl_ncp);
2722 cache_resolve(tond->nl_ncp, tond->nl_cred);
2723 }
2724 fromnd->nl_flags |= NLC_NCPISLOCKED;
2725
2726 /*
2727 * make sure the parent directories linkages are the same
2728 */
2729 if (fncpd != fromnd->nl_ncp->nc_parent ||
2730 tncpd != tond->nl_ncp->nc_parent) {
2731 cache_drop(fncpd);
2732 cache_drop(tncpd);
2733 return (ENOENT);
2734 }
2735
2736 /*
2737 * Both the source and target must be within the same filesystem and
2738 * in the same filesystem as their parent directories within the
2739 * namecache topology.
2740 */
2741 mp = fncpd->nc_mount;
2742 if (mp != tncpd->nc_mount || mp != fromnd->nl_ncp->nc_mount ||
2743 mp != tond->nl_ncp->nc_mount) {
2744 cache_drop(fncpd);
2745 cache_drop(tncpd);
2746 return (EXDEV);
2747 }
2748
2749 /*
2750 * If the target exists and either the source or target is a directory,
2751 * then both must be directories.
2752 */
2753 if (tond->nl_ncp->nc_vp) {
2754 if (fromnd->nl_ncp->nc_vp->v_type == VDIR) {
2755 if (tond->nl_ncp->nc_vp->v_type != VDIR)
2756 error = ENOTDIR;
2757 } else if (tond->nl_ncp->nc_vp->v_type == VDIR) {
984263bc 2758 error = EISDIR;
984263bc
MD
2759 }
2760 }
fad57d0e 2761
984263bc 2762 /*
fad57d0e
MD
2763 * You cannot rename a source into itself or a subdirectory of itself.
2764 * We check this by travsersing the target directory upwards looking
2765 * for a match against the source.
984263bc 2766 */
fad57d0e
MD
2767 if (error == 0) {
2768 for (ncp = tncpd; ncp; ncp = ncp->nc_parent) {
2769 if (fromnd->nl_ncp == ncp) {
2770 error = EINVAL;
2771 break;
2772 }
984263bc 2773 }
fad57d0e
MD
2774 }
2775
2776 cache_drop(fncpd);
2777 cache_drop(tncpd);
2778 if (error)
2779 return (error);
2780 error = VOP_NRENAME(fromnd->nl_ncp, tond->nl_ncp, tond->nl_cred);
984263bc
MD
2781 return (error);
2782}
2783
2784/*
9697c509 2785 * rename_args(char *from, char *to)
41c20dac 2786 *
9697c509
DRJ
2787 * Rename files. Source and destination must either both be directories,
2788 * or both not be directories. If target is a directory, it must be empty.
984263bc 2789 */
984263bc 2790int
9697c509
DRJ
2791rename(struct rename_args *uap)
2792{
fad57d0e 2793 struct nlookupdata fromnd, tond;
9697c509
DRJ
2794 int error;
2795
fad57d0e
MD
2796 error = nlookup_init(&fromnd, uap->from, UIO_USERSPACE, 0);
2797 if (error == 0) {
2798 error = nlookup_init(&tond, uap->to, UIO_USERSPACE, 0);
2799 if (error == 0)
2800 error = kern_rename(&fromnd, &tond);
2801 nlookup_done(&tond);
2802 }
2803 nlookup_done(&fromnd);
9697c509
DRJ
2804 return (error);
2805}
2806
2807int
fad57d0e 2808kern_mkdir(struct nlookupdata *nd, int mode)
984263bc 2809{
dadab5e9
MD
2810 struct thread *td = curthread;
2811 struct proc *p = td->td_proc;
fad57d0e 2812 struct namecache *ncp;
41c20dac 2813 struct vnode *vp;
984263bc
MD
2814 struct vattr vattr;
2815 int error;
984263bc
MD
2816
2817 bwillwrite();
fad57d0e
MD
2818 nd->nl_flags |= NLC_WILLBEDIR | NLC_CREATE;
2819 if ((error = nlookup(nd)) != 0)
984263bc 2820 return (error);
fad57d0e
MD
2821
2822 ncp = nd->nl_ncp;
2823 if (ncp->nc_vp)
984263bc 2824 return (EEXIST);
fad57d0e 2825
984263bc
MD
2826 VATTR_NULL(&vattr);
2827 vattr.va_type = VDIR;
9697c509 2828 vattr.va_mode = (mode & ACCESSPERMS) &~ p->p_fd->fd_cmask;
fad57d0e
MD
2829
2830 vp = NULL;
2831 error = VOP_NMKDIR(ncp, &vp, p->p_ucred, &vattr);
9697c509 2832 if (error == 0)
fad57d0e 2833 vput(vp);
984263bc
MD
2834 return (error);
2835}
2836
2837/*
9697c509 2838 * mkdir_args(char *path, int mode)
41c20dac 2839 *
9697c509 2840 * Make a directory file.
984263bc 2841 */
984263bc
MD
2842/* ARGSUSED */
2843int
9697c509
DRJ
2844mkdir(struct mkdir_args *uap)
2845{
fad57d0e 2846 struct nlookupdata nd;
9697c509
DRJ
2847 int error;
2848
fad57d0e
MD
2849 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0);
2850 if (error == 0)
2851 error = kern_mkdir(&nd, uap->mode);
2852 nlookup_done(&nd);
9697c509
DRJ
2853 return (error);
2854}
2855
2856int
fad57d0e 2857kern_rmdir(struct nlookupdata *nd)
984263bc 2858{
fad57d0e 2859 struct namecache *ncp;
984263bc 2860 int error;
984263bc
MD
2861
2862 bwillwrite();
fad57d0e
MD
2863 nd->nl_flags |= NLC_DELETE;
2864 if ((error = nlookup(nd)) != 0)
984263bc 2865 return (error);
fad57d0e
MD
2866
2867 ncp = nd->nl_ncp;
2868 error = VOP_NRMDIR(ncp, nd->nl_cred);
984263bc
MD
2869 return (error);
2870}
2871
984263bc 2872/*
9697c509 2873 * rmdir_args(char *path)
41c20dac 2874 *
9697c509 2875 * Remove a directory file.
984263bc 2876 */
9697c509 2877/* ARGSUSED */
984263bc 2878int
9697c509 2879rmdir(struct rmdir_args *uap)
984263bc 2880{
fad57d0e 2881 struct nlookupdata nd;
9697c509
DRJ
2882 int error;
2883
fad57d0e
MD
2884 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0);
2885 if (error == 0)
2886 error = kern_rmdir(&nd);
2887 nlookup_done(&nd);
984263bc
MD
2888 return (error);
2889}
984263bc 2890
984263bc 2891int
9697c509 2892kern_getdirentries(int fd, char *buf, u_int count, long *basep, int *res)
984263bc 2893{
dadab5e9
MD
2894 struct thread *td = curthread;
2895 struct proc *p = td->td_proc;
984263bc
MD
2896 struct vnode *vp;
2897 struct file *fp;
2898 struct uio auio;
2899 struct iovec aiov;
2900 long loff;
2901 int error, eofflag;
2902
9697c509 2903 if ((error = getvnode(p->p_fd, fd, &fp)) != 0)
984263bc
MD
2904 return (error);
2905 if ((fp->f_flag & FREAD) == 0)
2906 return (EBADF);
2907 vp = (struct vnode *)fp->f_data;
2908unionread:
2909 if (vp->v_type != VDIR)
2910 return (EINVAL);
9697c509
DRJ
2911 aiov.iov_base = buf;
2912 aiov.iov_len = count;
984263bc
MD
2913 auio.uio_iov = &aiov;
2914 auio.uio_iovcnt = 1;
2915 auio.uio_rw = UIO_READ;
2916 auio.uio_segflg = UIO_USERSPACE;
dadab5e9 2917 auio.uio_td = td;
9697c509 2918 auio.uio_resid = count;
5fd012e0
MD
2919 /* vn_lock(vp, LK_SHARED | LK_RETRY, td); */
2920 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
984263bc
MD
2921 loff = auio.uio_offset = fp->f_offset;
2922 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL, NULL);
2923 fp->f_offset = auio.uio_offset;
5fd012e0 2924 VOP_UNLOCK(vp, 0, td);
984263bc
MD
2925 if (error)
2926 return (error);
9697c509 2927 if (count == auio.uio_resid) {
984263bc 2928 if (union_dircheckp) {
dadab5e9 2929 error = union_dircheckp(td, &vp, fp);
984263bc
MD
2930 if (error == -1)
2931 goto unionread;
2932 if (error)
2933 return (error);
2934 }
2935 if ((vp->v_flag & VROOT) &&
2936 (vp->v_mount->mnt_flag & MNT_UNION)) {
2937 struct vnode *tvp = vp;
2938 vp = vp->v_mount->mnt_vnodecovered;
597aea93 2939 vref(vp);
e38462a2 2940 fp->f_data = (caddr_t)vp;
984263bc
MD
2941 fp->f_offset = 0;
2942 vrele(tvp);
2943 goto unionread;
2944 }
2945 }
9697c509
DRJ
2946 if (basep) {
2947 *basep = loff;
984263bc 2948 }
9697c509
DRJ
2949 *res = count - auio.uio_resid;
2950 return (error);
2951}
2952
2953/*
2954 * getdirentries_args(int fd, char *buf, u_int conut, long *basep)
2955 *
2956 * Read a block of directory entries in a file system independent format.
2957 */
2958int
2959getdirentries(struct getdirentries_args *uap)
2960{
2961 long base;
2962 int error;
2963
2964 error = kern_getdirentries(uap->fd, uap->buf, uap->count, &base,
2965 &uap->sysmsg_result);
2966
2967 if (error == 0)
2968 error = copyout(&base, uap->basep, sizeof(*uap->basep));
984263bc
MD
2969 return (error);
2970}
41c20dac
MD
2971
2972/*
2973 * getdents_args(int fd, char *buf, size_t count)
2974 */
984263bc 2975int
41c20dac 2976getdents(struct getdents_args *uap)
984263bc 2977{
9697c509
DRJ
2978 int error;
2979
2980 error = kern_getdirentries(uap->fd, uap->buf, uap->count, NULL,
2981 &uap->sysmsg_result);
41c20dac 2982
9697c509 2983 return (error);
984263bc
MD
2984}
2985
2986/*
41c20dac
MD
2987 * umask(int newmask)
2988 *
984263bc
MD
2989 * Set the mode mask for creation of filesystem nodes.
2990 *
2991 * MP SAFE
2992 */
984263bc 2993int
41c20dac 2994umask(struct umask_args *uap)
984263bc 2995{
dadab5e9
MD
2996 struct thread *td = curthread;
2997 struct proc *p = td->td_proc;
41c20dac 2998 struct filedesc *fdp;
984263bc
MD
2999
3000 fdp = p->p_fd;
c7114eea 3001 uap->sysmsg_result = fdp->fd_cmask;
ab2eb4eb 3002 fdp->fd_cmask = uap->newmask & ALLPERMS;
984263bc
MD
3003 return (0);
3004}
3005
3006/*
41c20dac
MD
3007 * revoke(char *path)
3008 *
984263bc
MD
3009 * Void all references to file by ripping underlying filesystem
3010 * away from vnode.
3011 */
984263bc
MD
3012/* ARGSUSED */
3013int
41c20dac 3014revoke(struct revoke_args *uap)
984263bc 3015{
dadab5e9 3016 struct thread *td = curthread;
fad57d0e 3017 struct nlookupdata nd;
984263bc 3018 struct vattr vattr;
fad57d0e
MD
3019 struct vnode *vp;
3020 struct ucred *cred;
984263bc 3021 int error;
984263bc 3022
fad57d0e 3023 vp = NULL;
ab2eb4eb 3024 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
fad57d0e
MD
3025 if (error == 0)
3026 error = nlookup(&nd);
3027 if (error == 0)
3028 error = cache_vref(nd.nl_ncp, nd.nl_cred, &vp);
3029 cred = crhold(nd.nl_cred);
3030 nlookup_done(&nd);
3031 if (error == 0) {
3032 if (vp->v_type != VCHR && vp->v_type != VBLK)
3033 error = EINVAL;
3034 if (error == 0)
3035 error = VOP_GETATTR(vp, &vattr, td);
3036 if (error == 0 && cred->cr_uid != vattr.va_uid)
3037 error = suser_cred(cred, PRISON_ROOT);
3038 if (error == 0 && count_udev(vp->v_udev) > 0) {
3039 if ((error = vx_lock(vp)) == 0) {
3040 VOP_REVOKE(vp, REVOKEALL);
3041 vx_unlock(vp);
3042 }
5fd012e0 3043 }
fad57d0e 3044 vrele(vp);
5fd012e0 3045 }
fad57d0e 3046 crfree(cred);
984263bc
MD
3047 return (error);
3048}
3049
3050/*
3051 * Convert a user file descriptor to a kernel file entry.
3052 */
3053int
41c20dac 3054getvnode(struct filedesc *fdp, int fd, struct file **fpp)
984263bc
MD
3055{
3056 struct file *fp;
3057
3058 if ((u_int)fd >= fdp->fd_nfiles ||
3059 (fp = fdp->fd_ofiles[fd]) == NULL)
3060 return (EBADF);
3061 if (fp->f_type != DTYPE_VNODE && fp->f_type != DTYPE_FIFO)
3062 return (EINVAL);
3063 *fpp = fp;
3064 return (0);
3065}
3066/*
41c20dac
MD
3067 * getfh_args(char *fname, fhandle_t *fhp)
3068 *
984263bc
MD
3069 * Get (NFS) file handle
3070 */
984263bc 3071int
41c20dac 3072getfh(struct getfh_args *uap)
984263bc 3073{
dadab5e9 3074 struct thread *td = curthread;
fad57d0e 3075 struct nlookupdata nd;
984263bc 3076 fhandle_t fh;
41c20dac 3077 struct vnode *vp;
984263bc
MD
3078 int error;
3079
3080 /*
3081 * Must be super user
3082 */
fad57d0e 3083 if ((error = suser(td)) != 0)
984263bc 3084 return (error);
fad57d0e
MD
3085
3086 vp = NULL;
3087 error = nlookup_init(&nd, uap->fname, UIO_USERSPACE, NLC_FOLLOW);
3088 if (error == 0)
3089 error = nlookup(&nd);
3090 if (error == 0)
3091 error = cache_vget(nd.nl_ncp, nd.nl_cred, LK_EXCLUSIVE, &vp);
3092 nlookup_done(&nd);
3093 if (error == 0) {
3094 bzero(&fh, sizeof(fh));
3095 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid;
3096 error = VFS_VPTOFH(vp, &fh.fh_fid);
3097 vput(vp);
3098 if (error == 0)
3099 error = copyout(&fh, uap->fhp, sizeof(fh));
3100 }
984263bc
MD
3101 return (error);
3102}
3103
3104/*
41c20dac
MD
3105 * fhopen_args(const struct fhandle *u_fhp, int flags)
3106 *
984263bc
MD
3107 * syscall for the rpc.lockd to use to translate a NFS file handle into
3108 * an open descriptor.
3109 *
3110 * warning: do not remove the suser() call or this becomes one giant
3111 * security hole.
3112 */
984263bc 3113int
41c20dac 3114fhopen(struct fhopen_args *uap)
984263bc 3115{
dadab5e9
MD
3116 struct thread *td = curthread;
3117 struct proc *p = td->td_proc;
984263bc
MD
3118 struct mount *mp;
3119 struct vnode *vp;
3120 struct fhandle fhp;
3121 struct vattr vat;
3122 struct vattr *vap = &vat;
3123 struct flock lf;
41c20dac 3124 struct filedesc *fdp = p->p_fd;
984263bc
MD
3125 int fmode, mode, error, type;
3126 struct file *nfp;
fad57d0e 3127 struct file *fp;
984263bc
MD
3128 int indx;
3129
3130 /*
3131 * Must be super user
3132 */
dadab5e9 3133 error = suser(td);
984263bc
MD
3134 if (error)
3135 return (error);
3136
ab2eb4eb 3137 fmode = FFLAGS(uap->flags);
984263bc
MD
3138 /* why not allow a non-read/write open for our lockd? */
3139 if (((fmode & (FREAD | FWRITE)) == 0) || (fmode & O_CREAT))
3140 return (EINVAL);
ab2eb4eb 3141 error = copyin(uap->u_fhp, &fhp, sizeof(fhp));
984263bc
MD
3142 if (error)
3143 return(error);
3144 /* find the mount point */
3145 mp = vfs_getvfs(&fhp.fh_fsid);
3146 if (mp == NULL)
3147 return (ESTALE);
3148 /* now give me my vnode, it gets returned to me locked */
3149 error = VFS_FHTOVP(mp, &fhp.fh_fid, &vp);
3150 if (error)
3151 return (error);
3152 /*
3153 * from now on we have to make sure not
3154 * to forget about the vnode
3155 * any error that causes an abort must vput(vp)
3156 * just set error = err and 'goto bad;'.
3157 */
3158
3159 /*
3160 * from vn_open
3161 */
3162 if (vp->v_type == VLNK) {
3163 error = EMLINK;
3164 goto bad;
3165 }
3166 if (vp->v_type == VSOCK) {
3167 error = EOPNOTSUPP;
3168 goto bad;
3169 }
3170 mode = 0;
3171 if (fmode & (FWRITE | O_TRUNC)) {
3172 if (vp->v_type == VDIR) {
3173 error = EISDIR;
3174 goto bad;
3175 }
3176 error = vn_writechk(vp);
3177 if (error)
3178 goto bad;
3179 mode |= VWRITE;
3180 }
3181 if (fmode & FREAD)
3182 mode |= VREAD;
3183 if (mode) {
dadab5e9 3184 error = VOP_ACCESS(vp, mode, p->p_ucred, td);
984263bc
MD
3185 if (error)
3186 goto bad;
3187 }
3188 if (fmode & O_TRUNC) {
5fd012e0 3189 VOP_UNLOCK(vp, 0, td); /* XXX */
dadab5e9 3190 VOP_LEASE(vp, td, p->p_ucred, LEASE_WRITE);
5fd012e0 3191 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); /* XXX */
984263bc
MD
3192 VATTR_NULL(vap);
3193 vap->va_size = 0;
dadab5e9 3194 error = VOP_SETATTR(vp, vap, p->p_ucred, td);
984263bc
MD
3195 if (error)
3196 goto bad;
3197 }
fad57d0e 3198
984263bc 3199 /*
fad57d0e
MD
3200 * VOP_OPEN needs the file pointer so it can potentially override
3201 * it.
3202 *
3203 * WARNING! no f_ncp will be associated when fhopen()ing a directory.
3204 * XXX
984263bc 3205 */
fad57d0e
MD
3206 if ((error = falloc(p, &nfp, NULL)) != 0)
3207 goto bad;
3208 fp = nfp;
3209
3210 fp->f_data = (caddr_t)vp;
3211 fp->f_flag = fmode & FMASK;
3212 fp->f_ops = &vnode_fileops;
3213 fp->f_type = DTYPE_VNODE;
3214
3215 error = VOP_OPEN(vp, fmode, p->p_ucred, fp, td);
3216 if (error) {
3217 /*
3218 * setting f_ops this way prevents VOP_CLOSE from being
3219 * called or fdrop() releasing the vp from v_data. Since
3220 * the VOP_OPEN failed we don't want to VOP_CLOSE.
3221 */
3222 fp->f_ops = &badfileops;
3223 fp->f_data = NULL;
3224 fdrop(fp, td);
3225 goto bad;
984263bc
MD
3226 }
3227 if (fmode & FWRITE)
3228 vp->v_writecount++;
3229
3230 /*
fad57d0e
MD
3231 * The fp now owns a reference on the vnode. We still have our own
3232 * ref+lock.
3233 */
3234 vref(vp);
3235
3236 /*
3237 * Make sure that a VM object is created for VMIO support. If this
3238 * fails just fdrop() normally to clean up.
984263bc 3239 */
fad57d0e
MD
3240 if (vn_canvmio(vp) == TRUE) {
3241 if ((error = vfs_object_create(vp, td)) != 0) {
3242 fdrop(fp, td);
3243 goto bad;
3244 }
3245 }
984263bc 3246
fad57d0e
MD
3247 /*
3248 * The open was successful, associate it with a file descriptor.
3249 */
3250 if ((error = fsetfd(p, fp, &indx)) != 0) {
984263bc
MD
3251 if (fmode & FWRITE)
3252 vp->v_writecount--;
fad57d0e 3253 fdrop(fp, td);
984263bc
MD
3254 goto bad;
3255 }
984263bc 3256
984263bc
MD
3257 if (fmode & (O_EXLOCK | O_SHLOCK)) {
3258 lf.l_whence = SEEK_SET;
3259 lf.l_start = 0;
3260 lf.l_len = 0;
3261 if (fmode & O_EXLOCK)
3262 lf.l_type = F_WRLCK;
3263 else
3264 lf.l_type = F_RDLCK;
3265 type = F_FLOCK;
3266 if ((fmode & FNONBLOCK) == 0)
3267 type |= F_WAIT;
5fd012e0 3268 VOP_UNLOCK(vp, 0, td);
984263bc
MD
3269 if ((error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type)) != 0) {
3270 /*
3271 * lock request failed. Normally close the descriptor
3272 * but handle the case where someone might have dup()d
3273 * or close()d it when we weren't looking.
3274 */
3275 if (fdp->fd_ofiles[indx] == fp) {
69908319 3276 funsetfd(fdp, indx);
dadab5e9 3277 fdrop(fp, td);
984263bc
MD
3278 }
3279
3280 /*
3281 * release our private reference.
3282 */
dadab5e9 3283 fdrop(fp, td);
fad57d0e 3284 vrele(vp);
984263bc
MD
3285 return (error);
3286 }
5fd012e0 3287 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
984263bc
MD
3288 fp->f_flag |= FHASLOCK;
3289 }
3290 if ((vp->v_type == VREG) && (VOP_GETVOBJECT(vp, NULL) != 0))
3b568787 3291 vfs_object_create(vp, td);
984263bc 3292
fad57d0e 3293 vput(vp);
dadab5e9 3294 fdrop(fp, td);
c7114eea 3295 uap->sysmsg_result = indx;
984263bc
MD
3296 return (0);
3297
3298bad:
3299 vput(vp);
3300 return (error);
3301}
3302
41c20dac
MD
3303/*
3304 * fhstat_args(struct fhandle *u_fhp, struct stat *sb)
3305 */
984263bc 3306int
41c20dac 3307fhstat(struct fhstat_args *uap)
984263bc 3308{