Raise the size of the /etc MFS to 12MB (for ssh blacklists).
[dragonfly.git] / sys / kern / vfs_syscalls.c
CommitLineData
984263bc
MD
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 $
2ec4b00d 40 * $DragonFly: src/sys/kern/vfs_syscalls.c,v 1.127 2008/05/18 05:54:25 dillon Exp $
984263bc
MD
41 */
42
984263bc
MD
43#include <sys/param.h>
44#include <sys/systm.h>
45#include <sys/buf.h>
16df2c74 46#include <sys/conf.h>
984263bc
MD
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>
984263bc
MD
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>
984263bc
MD
63#include <sys/dirent.h>
64#include <sys/extattr.h>
8fa76237 65#include <sys/spinlock.h>
8f6f8622 66#include <sys/kern_syscall.h>
70aac194 67#include <sys/objcache.h>
984263bc 68#include <sys/sysctl.h>
408357d8
MD
69
70#include <sys/buf2.h>
28623bf9
MD
71#include <sys/file2.h>
72#include <sys/spinlock2.h>
73
984263bc
MD
74#include <vm/vm.h>
75#include <vm/vm_object.h>
984263bc
MD
76#include <vm/vm_page.h>
77
28623bf9
MD
78#include <machine/limits.h>
79#include <machine/stdarg.h>
80
81#include <vfs/union/union.h>
dadab5e9 82
28623bf9 83static void mount_warning(struct mount *mp, const char *ctl, ...);
d3c546e6 84static int mount_path(struct proc *p, struct mount *mp, char **rb, char **fb);
e24b948e 85static int checkvp_chdir (struct vnode *vn, struct thread *td);
77480a97 86static void checkdirs (struct nchandle *old_nch, struct nchandle *new_nch);
402ed7e1 87static int chroot_refuse_vdir_fds (struct filedesc *fdp);
75ffff0d 88static int chroot_visible_mnt(struct mount *mp, struct proc *p);
402ed7e1
RG
89static int getutimes (const struct timeval *, struct timespec *);
90static int setfown (struct vnode *, uid_t, gid_t);
91static int setfmode (struct vnode *, int);
92static int setfflags (struct vnode *, int);
93static int setutimes (struct vnode *, const struct timespec *, int);
984263bc
MD
94static int usermount = 0; /* if 1, non-root can mount fs. */
95
402ed7e1 96int (*union_dircheckp) (struct thread *, struct vnode **, struct file *);
984263bc
MD
97
98SYSCTL_INT(_vfs, OID_AUTO, usermount, CTLFLAG_RW, &usermount, 0, "");
99
100/*
101 * Virtual File System System Calls
102 */
103
104/*
105 * Mount a file system.
106 */
41c20dac
MD
107/*
108 * mount_args(char *type, char *path, int flags, caddr_t data)
109 */
984263bc
MD
110/* ARGSUSED */
111int
753fd850 112sys_mount(struct mount_args *uap)
984263bc 113{
dadab5e9
MD
114 struct thread *td = curthread;
115 struct proc *p = td->td_proc;
984263bc 116 struct vnode *vp;
28623bf9 117 struct nchandle nch;
984263bc
MD
118 struct mount *mp;
119 struct vfsconf *vfsp;
120 int error, flag = 0, flag2 = 0;
1d505369 121 int hasmount;
984263bc 122 struct vattr va;
21739618 123 struct nlookupdata nd;
984263bc 124 char fstypename[MFSNAMELEN];
acde96db 125 struct ucred *cred = p->p_ucred;
984263bc 126
cd0d3e17 127 KKASSERT(p);
acde96db 128 if (cred->cr_prison != NULL)
84c3a710 129 return (EPERM);
dadab5e9 130 if (usermount == 0 && (error = suser(td)))
984263bc
MD
131 return (error);
132 /*
133 * Do not allow NFS export by non-root users.
134 */
ab2eb4eb 135 if (uap->flags & MNT_EXPORTED) {
dadab5e9 136 error = suser(td);
984263bc
MD
137 if (error)
138 return (error);
139 }
140 /*
141 * Silently enforce MNT_NOSUID and MNT_NODEV for non-root users
142 */
dadab5e9 143 if (suser(td))
ab2eb4eb 144 uap->flags |= MNT_NOSUID | MNT_NODEV;
21739618 145
984263bc 146 /*
28623bf9 147 * Lookup the requested path and extract the nch and vnode.
984263bc 148 */
21739618
MD
149 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
150 if (error == 0) {
151 if ((error = nlookup(&nd)) == 0) {
28623bf9 152 if (nd.nl_nch.ncp->nc_vp == NULL)
21739618
MD
153 error = ENOENT;
154 }
155 }
156 if (error) {
157 nlookup_done(&nd);
984263bc 158 return (error);
21739618
MD
159 }
160
161 /*
162 * Extract the locked+refd ncp and cleanup the nd structure
163 */
28623bf9
MD
164 nch = nd.nl_nch;
165 cache_zero(&nd.nl_nch);
21739618
MD
166 nlookup_done(&nd);
167
28623bf9 168 if ((nch.ncp->nc_flag & NCF_ISMOUNTPT) && cache_findmount(&nch))
1d505369
MD
169 hasmount = 1;
170 else
171 hasmount = 0;
172
173
21739618 174 /*
28623bf9 175 * now we have the locked ref'd nch and unreferenced vnode.
21739618 176 */
28623bf9 177 vp = nch.ncp->nc_vp;
87de5057 178 if ((error = vget(vp, LK_EXCLUSIVE)) != 0) {
28623bf9 179 cache_put(&nch);
21739618
MD
180 return (error);
181 }
28623bf9 182 cache_unlock(&nch);
21739618
MD
183
184 /*
28623bf9 185 * Now we have an unlocked ref'd nch and a locked ref'd vp
21739618 186 */
ab2eb4eb 187 if (uap->flags & MNT_UPDATE) {
984263bc 188 if ((vp->v_flag & VROOT) == 0) {
28623bf9 189 cache_drop(&nch);
984263bc
MD
190 vput(vp);
191 return (EINVAL);
192 }
193 mp = vp->v_mount;
194 flag = mp->mnt_flag;
195 flag2 = mp->mnt_kern_flag;
196 /*
197 * We only allow the filesystem to be reloaded if it
198 * is currently mounted read-only.
199 */
ab2eb4eb 200 if ((uap->flags & MNT_RELOAD) &&
984263bc 201 ((mp->mnt_flag & MNT_RDONLY) == 0)) {
28623bf9 202 cache_drop(&nch);
984263bc
MD
203 vput(vp);
204 return (EOPNOTSUPP); /* Needs translation */
205 }
206 /*
207 * Only root, or the user that did the original mount is
208 * permitted to update it.
209 */
acde96db 210 if (mp->mnt_stat.f_owner != cred->cr_uid &&
dadab5e9 211 (error = suser(td))) {
28623bf9 212 cache_drop(&nch);
984263bc
MD
213 vput(vp);
214 return (error);
215 }
f9642f56 216 if (vfs_busy(mp, LK_NOWAIT)) {
28623bf9 217 cache_drop(&nch);
984263bc
MD
218 vput(vp);
219 return (EBUSY);
220 }
1d505369 221 if ((vp->v_flag & VMOUNT) != 0 || hasmount) {
28623bf9 222 cache_drop(&nch);
f9642f56 223 vfs_unbusy(mp);
984263bc
MD
224 vput(vp);
225 return (EBUSY);
226 }
227 vp->v_flag |= VMOUNT;
984263bc 228 mp->mnt_flag |=
ab2eb4eb 229 uap->flags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE);
a11aaa81 230 vn_unlock(vp);
984263bc
MD
231 goto update;
232 }
233 /*
234 * If the user is not root, ensure that they own the directory
235 * onto which we are attempting to mount.
236 */
87de5057 237 if ((error = VOP_GETATTR(vp, &va)) ||
acde96db 238 (va.va_uid != cred->cr_uid && (error = suser(td)))) {
28623bf9 239 cache_drop(&nch);
984263bc
MD
240 vput(vp);
241 return (error);
242 }
87de5057 243 if ((error = vinvalbuf(vp, V_SAVE, 0, 0)) != 0) {
28623bf9 244 cache_drop(&nch);
984263bc
MD
245 vput(vp);
246 return (error);
247 }
248 if (vp->v_type != VDIR) {
28623bf9 249 cache_drop(&nch);
984263bc
MD
250 vput(vp);
251 return (ENOTDIR);
252 }
5dc91765
MD
253 if (vp->v_mount->mnt_kern_flag & MNTK_NOSTKMNT) {
254 cache_drop(&nch);
255 vput(vp);
256 return (EPERM);
257 }
ab2eb4eb 258 if ((error = copyinstr(uap->type, fstypename, MFSNAMELEN, NULL)) != 0) {
28623bf9 259 cache_drop(&nch);
984263bc
MD
260 vput(vp);
261 return (error);
262 }
21739618 263 for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) {
984263bc
MD
264 if (!strcmp(vfsp->vfc_name, fstypename))
265 break;
21739618 266 }
984263bc
MD
267 if (vfsp == NULL) {
268 linker_file_t lf;
269
270 /* Only load modules for root (very important!) */
dadab5e9 271 if ((error = suser(td)) != 0) {
28623bf9 272 cache_drop(&nch);
984263bc
MD
273 vput(vp);
274 return error;
275 }
276 error = linker_load_file(fstypename, &lf);
277 if (error || lf == NULL) {
28623bf9 278 cache_drop(&nch);
984263bc
MD
279 vput(vp);
280 if (lf == NULL)
281 error = ENODEV;
282 return error;
283 }
284 lf->userrefs++;
285 /* lookup again, see if the VFS was loaded */
21739618 286 for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) {
984263bc
MD
287 if (!strcmp(vfsp->vfc_name, fstypename))
288 break;
21739618 289 }
984263bc
MD
290 if (vfsp == NULL) {
291 lf->userrefs--;
292 linker_file_unload(lf);
28623bf9 293 cache_drop(&nch);
984263bc
MD
294 vput(vp);
295 return (ENODEV);
296 }
297 }
1d505369 298 if ((vp->v_flag & VMOUNT) != 0 || hasmount) {
28623bf9 299 cache_drop(&nch);
984263bc
MD
300 vput(vp);
301 return (EBUSY);
302 }
303 vp->v_flag |= VMOUNT;
984263bc
MD
304
305 /*
306 * Allocate and initialize the filesystem.
307 */
efda3bd0 308 mp = kmalloc(sizeof(struct mount), M_MOUNT, M_ZERO|M_WAITOK);
984263bc
MD
309 TAILQ_INIT(&mp->mnt_nvnodelist);
310 TAILQ_INIT(&mp->mnt_reservedvnlist);
2281065e 311 TAILQ_INIT(&mp->mnt_jlist);
984263bc 312 mp->mnt_nvnodelistsize = 0;
ab6f251b 313 lockinit(&mp->mnt_lock, "vfslock", 0, 0);
f9642f56 314 vfs_busy(mp, LK_NOWAIT);
984263bc
MD
315 mp->mnt_op = vfsp->vfc_vfsops;
316 mp->mnt_vfc = vfsp;
317 vfsp->vfc_refcount++;
318 mp->mnt_stat.f_type = vfsp->vfc_typenum;
319 mp->mnt_flag |= vfsp->vfc_flags & MNT_VISFLAGMASK;
320 strncpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN);
acde96db 321 mp->mnt_stat.f_owner = cred->cr_uid;
984263bc 322 mp->mnt_iosize_max = DFLTPHYS;
a11aaa81 323 vn_unlock(vp);
984263bc
MD
324update:
325 /*
326 * Set the mount level flags.
327 */
ab2eb4eb 328 if (uap->flags & MNT_RDONLY)
984263bc
MD
329 mp->mnt_flag |= MNT_RDONLY;
330 else if (mp->mnt_flag & MNT_RDONLY)
331 mp->mnt_kern_flag |= MNTK_WANTRDWR;
332 mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV |
333 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOATIME |
334 MNT_NOSYMFOLLOW | MNT_IGNORE |
335 MNT_NOCLUSTERR | MNT_NOCLUSTERW | MNT_SUIDDIR);
ab2eb4eb 336 mp->mnt_flag |= uap->flags & (MNT_NOSUID | MNT_NOEXEC |
984263bc
MD
337 MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_FORCE |
338 MNT_NOSYMFOLLOW | MNT_IGNORE |
339 MNT_NOATIME | MNT_NOCLUSTERR | MNT_NOCLUSTERW | MNT_SUIDDIR);
340 /*
341 * Mount the filesystem.
342 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they
fad57d0e 343 * get.
984263bc 344 */
acde96db 345 error = VFS_MOUNT(mp, uap->path, uap->data, cred);
984263bc
MD
346 if (mp->mnt_flag & MNT_UPDATE) {
347 if (mp->mnt_kern_flag & MNTK_WANTRDWR)
348 mp->mnt_flag &= ~MNT_RDONLY;
349 mp->mnt_flag &=~ (MNT_UPDATE | MNT_RELOAD | MNT_FORCE);
350 mp->mnt_kern_flag &=~ MNTK_WANTRDWR;
351 if (error) {
352 mp->mnt_flag = flag;
353 mp->mnt_kern_flag = flag2;
354 }
f9642f56 355 vfs_unbusy(mp);
984263bc 356 vp->v_flag &= ~VMOUNT;
984263bc 357 vrele(vp);
28623bf9 358 cache_drop(&nch);
984263bc
MD
359 return (error);
360 }
ca466bae 361 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
984263bc 362 /*
21739618 363 * Put the new filesystem on the mount list after root. The mount
28623bf9
MD
364 * point gets its own mnt_ncmountpt (unless the VFS already set one
365 * up) which represents the root of the mount. The lookup code
366 * detects the mount point going forward and checks the root of
367 * the mount going backwards.
8e005a45
MD
368 *
369 * It is not necessary to invalidate or purge the vnode underneath
370 * because elements under the mount will be given their own glue
371 * namecache record.
984263bc 372 */
984263bc 373 if (!error) {
28623bf9
MD
374 if (mp->mnt_ncmountpt.ncp == NULL) {
375 /*
376 * allocate, then unlock, but leave the ref intact
377 */
378 cache_allocroot(&mp->mnt_ncmountpt, mp, NULL);
379 cache_unlock(&mp->mnt_ncmountpt);
380 }
381 mp->mnt_ncmounton = nch; /* inherits ref */
382 nch.ncp->nc_flag |= NCF_ISMOUNTPT;
383
384 /* XXX get the root of the fs and cache_setvp(mnt_ncmountpt...) */
984263bc 385 vp->v_flag &= ~VMOUNT;
861905fb 386 mountlist_insert(mp, MNTINS_LAST);
77480a97 387 checkdirs(&mp->mnt_ncmounton, &mp->mnt_ncmountpt);
a11aaa81 388 vn_unlock(vp);
41a01a4d 389 error = vfs_allocate_syncvnode(mp);
f9642f56 390 vfs_unbusy(mp);
1d505369
MD
391 error = VFS_START(mp, 0);
392 vrele(vp);
984263bc 393 } else {
66a1ddf5
MD
394 vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_coherency_ops);
395 vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_journal_ops);
396 vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_norm_ops);
397 vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_spec_ops);
398 vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_fifo_ops);
984263bc 399 vp->v_flag &= ~VMOUNT;
984263bc 400 mp->mnt_vfc->vfc_refcount--;
f9642f56 401 vfs_unbusy(mp);
efda3bd0 402 kfree(mp, M_MOUNT);
28623bf9 403 cache_drop(&nch);
984263bc
MD
404 vput(vp);
405 }
406 return (error);
407}
408
409/*
410 * Scan all active processes to see if any of them have a current
411 * or root directory onto which the new filesystem has just been
412 * mounted. If so, replace them with the new mount point.
21739618
MD
413 *
414 * The passed ncp is ref'd and locked (from the mount code) and
415 * must be associated with the vnode representing the root of the
416 * mount point.
984263bc 417 */
8fa76237 418struct checkdirs_info {
77480a97
MD
419 struct nchandle old_nch;
420 struct nchandle new_nch;
421 struct vnode *old_vp;
422 struct vnode *new_vp;
8fa76237
MD
423};
424
425static int checkdirs_callback(struct proc *p, void *data);
426
984263bc 427static void
77480a97 428checkdirs(struct nchandle *old_nch, struct nchandle *new_nch)
984263bc 429{
8fa76237 430 struct checkdirs_info info;
77480a97 431 struct vnode *olddp;
984263bc 432 struct vnode *newdp;
690a3127 433 struct mount *mp;
984263bc 434
77480a97
MD
435 /*
436 * If the old mount point's vnode has a usecount of 1, it is not
437 * being held as a descriptor anywhere.
438 */
439 olddp = old_nch->ncp->nc_vp;
3c37c940 440 if (olddp == NULL || olddp->v_sysref.refcnt == 1)
984263bc 441 return;
77480a97
MD
442
443 /*
444 * Force the root vnode of the new mount point to be resolved
445 * so we can update any matching processes.
446 */
447 mp = new_nch->mount;
690a3127 448 if (VFS_ROOT(mp, &newdp))
984263bc 449 panic("mount: lost mount");
77480a97
MD
450 cache_setunresolved(new_nch);
451 cache_setvp(new_nch, newdp);
21739618 452
77480a97
MD
453 /*
454 * Special handling of the root node
455 */
21739618
MD
456 if (rootvnode == olddp) {
457 vref(newdp);
77480a97 458 vfs_cache_setroot(newdp, cache_hold(new_nch));
21739618
MD
459 }
460
77480a97
MD
461 /*
462 * Pass newdp separately so the callback does not have to access
463 * it via new_nch->ncp->nc_vp.
464 */
465 info.old_nch = *old_nch;
466 info.new_nch = *new_nch;
467 info.new_vp = newdp;
8fa76237
MD
468 allproc_scan(checkdirs_callback, &info);
469 vput(newdp);
470}
471
472/*
473 * NOTE: callback is not MP safe because the scanned process's filedesc
474 * structure can be ripped out from under us, amoung other things.
475 */
476static int
477checkdirs_callback(struct proc *p, void *data)
478{
479 struct checkdirs_info *info = data;
480 struct filedesc *fdp;
28623bf9
MD
481 struct nchandle ncdrop1;
482 struct nchandle ncdrop2;
8fa76237
MD
483 struct vnode *vprele1;
484 struct vnode *vprele2;
485
486 if ((fdp = p->p_fd) != NULL) {
28623bf9
MD
487 cache_zero(&ncdrop1);
488 cache_zero(&ncdrop2);
8fa76237
MD
489 vprele1 = NULL;
490 vprele2 = NULL;
491
492 /*
493 * MPUNSAFE - XXX fdp can be pulled out from under a
494 * foreign process.
495 *
496 * A shared filedesc is ok, we don't have to copy it
497 * because we are making this change globally.
498 */
499 spin_lock_wr(&fdp->fd_spin);
77480a97
MD
500 if (fdp->fd_ncdir.mount == info->old_nch.mount &&
501 fdp->fd_ncdir.ncp == info->old_nch.ncp) {
8fa76237 502 vprele1 = fdp->fd_cdir;
77480a97
MD
503 vref(info->new_vp);
504 fdp->fd_cdir = info->new_vp;
8fa76237 505 ncdrop1 = fdp->fd_ncdir;
77480a97 506 cache_copy(&info->new_nch, &fdp->fd_ncdir);
984263bc 507 }
77480a97
MD
508 if (fdp->fd_nrdir.mount == info->old_nch.mount &&
509 fdp->fd_nrdir.ncp == info->old_nch.ncp) {
8fa76237 510 vprele2 = fdp->fd_rdir;
77480a97
MD
511 vref(info->new_vp);
512 fdp->fd_rdir = info->new_vp;
8fa76237 513 ncdrop2 = fdp->fd_nrdir;
77480a97 514 cache_copy(&info->new_nch, &fdp->fd_nrdir);
984263bc 515 }
8fa76237 516 spin_unlock_wr(&fdp->fd_spin);
28623bf9
MD
517 if (ncdrop1.ncp)
518 cache_drop(&ncdrop1);
519 if (ncdrop2.ncp)
520 cache_drop(&ncdrop2);
8fa76237
MD
521 if (vprele1)
522 vrele(vprele1);
523 if (vprele2)
524 vrele(vprele2);
984263bc 525 }
8fa76237 526 return(0);
984263bc
MD
527}
528
529/*
530 * Unmount a file system.
531 *
532 * Note: unmount takes a path to the vnode mounted on as argument,
533 * not special file (as before).
534 */
41c20dac
MD
535/*
536 * umount_args(char *path, int flags)
537 */
984263bc
MD
538/* ARGSUSED */
539int
753fd850 540sys_unmount(struct unmount_args *uap)
984263bc 541{
dadab5e9
MD
542 struct thread *td = curthread;
543 struct proc *p = td->td_proc;
d2293868 544 struct mount *mp = NULL;
984263bc 545 int error;
fad57d0e 546 struct nlookupdata nd;
984263bc 547
dadab5e9 548 KKASSERT(p);
84c3a710
HP
549 if (p->p_ucred->cr_prison != NULL)
550 return (EPERM);
551 if (usermount == 0 && (error = suser(td)))
552 return (error);
553
ab2eb4eb 554 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
fad57d0e
MD
555 if (error == 0)
556 error = nlookup(&nd);
fad57d0e 557 if (error)
d2293868 558 goto out;
fad57d0e 559
28623bf9 560 mp = nd.nl_nch.mount;
984263bc
MD
561
562 /*
563 * Only root, or the user that did the original mount is
564 * permitted to unmount this filesystem.
565 */
566 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) &&
d2293868
MD
567 (error = suser(td)))
568 goto out;
984263bc
MD
569
570 /*
571 * Don't allow unmounting the root file system.
572 */
573 if (mp->mnt_flag & MNT_ROOTFS) {
d2293868
MD
574 error = EINVAL;
575 goto out;
984263bc
MD
576 }
577
578 /*
579 * Must be the root of the filesystem
580 */
28623bf9 581 if (nd.nl_nch.ncp != mp->mnt_ncmountpt.ncp) {
d2293868
MD
582 error = EINVAL;
583 goto out;
984263bc 584 }
d2293868
MD
585
586out:
587 nlookup_done(&nd);
588 if (error)
589 return (error);
acde96db 590 return (dounmount(mp, uap->flags));
984263bc
MD
591}
592
593/*
594 * Do the actual file system unmount.
595 */
861905fb
MD
596static int
597dounmount_interlock(struct mount *mp)
598{
599 if (mp->mnt_kern_flag & MNTK_UNMOUNT)
600 return (EBUSY);
601 mp->mnt_kern_flag |= MNTK_UNMOUNT;
602 return(0);
603}
604
984263bc 605int
acde96db 606dounmount(struct mount *mp, int flags)
984263bc 607{
dcf26f79 608 struct namecache *ncp;
28623bf9 609 struct nchandle nch;
2ec4b00d 610 struct vnode *vp;
984263bc
MD
611 int error;
612 int async_flag;
2df9419c 613 int lflags;
28623bf9 614 int freeok = 1;
984263bc 615
861905fb
MD
616 /*
617 * Exclusive access for unmounting purposes
618 */
619 if ((error = mountlist_interlock(dounmount_interlock, mp)) != 0)
620 return (error);
621
622 /*
623 * Allow filesystems to detect that a forced unmount is in progress.
624 */
984263bc
MD
625 if (flags & MNT_FORCE)
626 mp->mnt_kern_flag |= MNTK_UNMOUNTF;
2df9419c 627 lflags = LK_EXCLUSIVE | ((flags & MNT_FORCE) ? 0 : LK_NOWAIT);
df4f70a6 628 error = lockmgr(&mp->mnt_lock, lflags);
984263bc
MD
629 if (error) {
630 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF);
631 if (mp->mnt_kern_flag & MNTK_MWAIT)
e38462a2 632 wakeup(mp);
984263bc
MD
633 return (error);
634 }
635
636 if (mp->mnt_flag & MNT_EXPUBLIC)
637 vfs_setpublicfs(NULL, NULL, NULL);
638
639 vfs_msync(mp, MNT_WAIT);
640 async_flag = mp->mnt_flag & MNT_ASYNC;
641 mp->mnt_flag &=~ MNT_ASYNC;
dcf26f79
MD
642
643 /*
28623bf9
MD
644 * If this filesystem isn't aliasing other filesystems,
645 * try to invalidate any remaining namecache entries and
646 * check the count afterwords.
dcf26f79 647 */
28623bf9
MD
648 if ((mp->mnt_kern_flag & MNTK_NCALIASED) == 0) {
649 cache_lock(&mp->mnt_ncmountpt);
650 cache_inval(&mp->mnt_ncmountpt, CINV_DESTROY|CINV_CHILDREN);
651 cache_unlock(&mp->mnt_ncmountpt);
652
653 if ((ncp = mp->mnt_ncmountpt.ncp) != NULL &&
654 (ncp->nc_refs != 1 || TAILQ_FIRST(&ncp->nc_list))) {
dcf26f79
MD
655
656 if ((flags & MNT_FORCE) == 0) {
657 error = EBUSY;
28623bf9
MD
658 mount_warning(mp, "Cannot unmount: "
659 "%d namecache "
660 "references still "
661 "present",
662 ncp->nc_refs - 1);
dcf26f79 663 } else {
28623bf9
MD
664 mount_warning(mp, "Forced unmount: "
665 "%d namecache "
666 "references still "
667 "present",
668 ncp->nc_refs - 1);
669 freeok = 0;
dcf26f79
MD
670 }
671 }
672 }
673
28623bf9
MD
674 /*
675 * nchandle records ref the mount structure. Expect a count of 1
676 * (our mount->mnt_ncmountpt).
677 */
678 if (mp->mnt_refs != 1) {
679 if ((flags & MNT_FORCE) == 0) {
680 mount_warning(mp, "Cannot unmount: "
681 "%d process references still "
682 "present", mp->mnt_refs);
683 error = EBUSY;
684 } else {
685 mount_warning(mp, "Forced unmount: "
686 "%d process references still "
687 "present", mp->mnt_refs);
688 freeok = 0;
689 }
690 }
691
2ec4b00d
MD
692 /*
693 * Decomission our special mnt_syncer vnode. This also stops
694 * the vnlru code. If we are unable to unmount we recommission
695 * the vnode.
696 */
dcf26f79 697 if (error == 0) {
2ec4b00d
MD
698 if ((vp = mp->mnt_syncer) != NULL) {
699 mp->mnt_syncer = NULL;
700 vrele(vp);
701 }
dcf26f79
MD
702 if (((mp->mnt_flag & MNT_RDONLY) ||
703 (error = VFS_SYNC(mp, MNT_WAIT)) == 0) ||
704 (flags & MNT_FORCE)) {
705 error = VFS_UNMOUNT(mp, flags);
706 }
707 }
984263bc 708 if (error) {
41a01a4d
MD
709 if (mp->mnt_syncer == NULL)
710 vfs_allocate_syncvnode(mp);
984263bc
MD
711 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF);
712 mp->mnt_flag |= async_flag;
df4f70a6 713 lockmgr(&mp->mnt_lock, LK_RELEASE);
984263bc 714 if (mp->mnt_kern_flag & MNTK_MWAIT)
e38462a2 715 wakeup(mp);
984263bc
MD
716 return (error);
717 }
432b8263
MD
718 /*
719 * Clean up any journals still associated with the mount after
720 * filesystem activity has ceased.
721 */
722 journal_remove_all_journals(mp,
723 ((flags & MNT_FORCE) ? MC_JOURNAL_STOP_IMM : 0));
724
861905fb 725 mountlist_remove(mp);
0961aa92
MD
726
727 /*
728 * Remove any installed vnode ops here so the individual VFSs don't
729 * have to.
730 */
66a1ddf5
MD
731 vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_coherency_ops);
732 vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_journal_ops);
733 vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_norm_ops);
734 vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_spec_ops);
735 vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_fifo_ops);
0961aa92 736
28623bf9
MD
737 if (mp->mnt_ncmountpt.ncp != NULL) {
738 nch = mp->mnt_ncmountpt;
739 cache_zero(&mp->mnt_ncmountpt);
740 cache_clrmountpt(&nch);
741 cache_drop(&nch);
742 }
743 if (mp->mnt_ncmounton.ncp != NULL) {
744 nch = mp->mnt_ncmounton;
745 cache_zero(&mp->mnt_ncmounton);
746 cache_clrmountpt(&nch);
747 cache_drop(&nch);
984263bc 748 }
1d505369 749
984263bc
MD
750 mp->mnt_vfc->vfc_refcount--;
751 if (!TAILQ_EMPTY(&mp->mnt_nvnodelist))
752 panic("unmount: dangling vnode");
df4f70a6 753 lockmgr(&mp->mnt_lock, LK_RELEASE);
984263bc 754 if (mp->mnt_kern_flag & MNTK_MWAIT)
e38462a2 755 wakeup(mp);
28623bf9
MD
756 if (freeok)
757 kfree(mp, M_MOUNT);
984263bc
MD
758 return (0);
759}
760
28623bf9
MD
761static
762void
763mount_warning(struct mount *mp, const char *ctl, ...)
764{
765 char *ptr;
766 char *buf;
767 __va_list va;
768
769 __va_start(va, ctl);
770 if (cache_fullpath(NULL, &mp->mnt_ncmounton, &ptr, &buf) == 0) {
6ea70f76 771 kprintf("unmount(%s): ", ptr);
379210cb 772 kvprintf(ctl, va);
6ea70f76 773 kprintf("\n");
28623bf9
MD
774 kfree(buf, M_TEMP);
775 } else {
56bcacad
MD
776 kprintf("unmount(%p", mp);
777 if (mp->mnt_ncmounton.ncp && mp->mnt_ncmounton.ncp->nc_name)
778 kprintf(",%s", mp->mnt_ncmounton.ncp->nc_name);
779 kprintf("): ");
379210cb 780 kvprintf(ctl, va);
6ea70f76 781 kprintf("\n");
28623bf9
MD
782 }
783 __va_end(va);
784}
785
d3c546e6
MD
786/*
787 * Shim cache_fullpath() to handle the case where a process is chrooted into
788 * a subdirectory of a mount. In this case if the root mount matches the
789 * process root directory's mount we have to specify the process's root
790 * directory instead of the mount point, because the mount point might
791 * be above the root directory.
792 */
793static
794int
795mount_path(struct proc *p, struct mount *mp, char **rb, char **fb)
796{
797 struct nchandle *nch;
d3c546e6
MD
798
799 if (p && p->p_fd->fd_nrdir.mount == mp)
800 nch = &p->p_fd->fd_nrdir;
801 else
802 nch = &mp->mnt_ncmountpt;
803 return(cache_fullpath(p, nch, rb, fb));
804}
805
984263bc
MD
806/*
807 * Sync each mounted filesystem.
808 */
984263bc
MD
809
810#ifdef DEBUG
811static int syncprt = 0;
812SYSCTL_INT(_debug, OID_AUTO, syncprt, CTLFLAG_RW, &syncprt, 0, "");
6bdbb368 813#endif /* DEBUG */
984263bc 814
861905fb
MD
815static int sync_callback(struct mount *mp, void *data);
816
984263bc
MD
817/* ARGSUSED */
818int
753fd850 819sys_sync(struct sync_args *uap)
984263bc 820{
861905fb 821 mountlist_scan(sync_callback, NULL, MNTSCAN_FORWARD);
6bdbb368 822#ifdef DEBUG
861905fb
MD
823 /*
824 * print out buffer pool stat information on each sync() call.
825 */
984263bc
MD
826 if (syncprt)
827 vfs_bufstats();
6bdbb368 828#endif /* DEBUG */
984263bc
MD
829 return (0);
830}
831
861905fb
MD
832static
833int
834sync_callback(struct mount *mp, void *data __unused)
835{
836 int asyncflag;
837
838 if ((mp->mnt_flag & MNT_RDONLY) == 0) {
839 asyncflag = mp->mnt_flag & MNT_ASYNC;
840 mp->mnt_flag &= ~MNT_ASYNC;
841 vfs_msync(mp, MNT_NOWAIT);
87de5057 842 VFS_SYNC(mp, MNT_NOWAIT);
861905fb
MD
843 mp->mnt_flag |= asyncflag;
844 }
845 return(0);
846}
847
984263bc
MD
848/* XXX PRISON: could be per prison flag */
849static int prison_quotas;
850#if 0
851SYSCTL_INT(_kern_prison, OID_AUTO, quotas, CTLFLAG_RW, &prison_quotas, 0, "");
852#endif
853
854/*
41c20dac
MD
855 * quotactl_args(char *path, int fcmd, int uid, caddr_t arg)
856 *
984263bc
MD
857 * Change filesystem quotas.
858 */
984263bc
MD
859/* ARGSUSED */
860int
753fd850 861sys_quotactl(struct quotactl_args *uap)
984263bc 862{
fad57d0e
MD
863 struct nlookupdata nd;
864 struct thread *td;
865 struct proc *p;
41c20dac 866 struct mount *mp;
984263bc 867 int error;
984263bc 868
fad57d0e
MD
869 td = curthread;
870 p = td->td_proc;
41c20dac 871 if (p->p_ucred->cr_prison && !prison_quotas)
984263bc 872 return (EPERM);
fad57d0e 873
ab2eb4eb 874 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
fad57d0e
MD
875 if (error == 0)
876 error = nlookup(&nd);
877 if (error == 0) {
28623bf9 878 mp = nd.nl_nch.mount;
ab2eb4eb 879 error = VFS_QUOTACTL(mp, uap->cmd, uap->uid,
acde96db 880 uap->arg, nd.nl_cred);
fad57d0e
MD
881 }
882 nlookup_done(&nd);
883 return (error);
984263bc
MD
884}
885
949ecb9b 886/*
2281065e 887 * mountctl(char *path, int op, int fd, const void *ctl, int ctllen,
949ecb9b
MD
888 * void *buf, int buflen)
889 *
890 * This function operates on a mount point and executes the specified
891 * operation using the specified control data, and possibly returns data.
892 *
893 * The actual number of bytes stored in the result buffer is returned, 0
894 * if none, otherwise an error is returned.
895 */
896/* ARGSUSED */
897int
753fd850 898sys_mountctl(struct mountctl_args *uap)
949ecb9b
MD
899{
900 struct thread *td = curthread;
901 struct proc *p = td->td_proc;
2281065e 902 struct file *fp;
949ecb9b
MD
903 void *ctl = NULL;
904 void *buf = NULL;
905 char *path = NULL;
906 int error;
907
908 /*
909 * Sanity and permissions checks. We must be root.
910 */
911 KKASSERT(p);
912 if (p->p_ucred->cr_prison != NULL)
913 return (EPERM);
914 if ((error = suser(td)) != 0)
915 return (error);
916
917 /*
918 * Argument length checks
919 */
39b13188 920 if (uap->ctllen < 0 || uap->ctllen > 1024)
949ecb9b 921 return (EINVAL);
39b13188 922 if (uap->buflen < 0 || uap->buflen > 16 * 1024)
949ecb9b
MD
923 return (EINVAL);
924 if (uap->path == NULL)
925 return (EINVAL);
926
927 /*
928 * Allocate the necessary buffers and copyin data
929 */
70aac194 930 path = objcache_get(namei_oc, M_WAITOK);
949ecb9b
MD
931 error = copyinstr(uap->path, path, MAXPATHLEN, NULL);
932 if (error)
933 goto done;
934
935 if (uap->ctllen) {
efda3bd0 936 ctl = kmalloc(uap->ctllen + 1, M_TEMP, M_WAITOK|M_ZERO);
949ecb9b
MD
937 error = copyin(uap->ctl, ctl, uap->ctllen);
938 if (error)
939 goto done;
940 }
941 if (uap->buflen)
efda3bd0 942 buf = kmalloc(uap->buflen + 1, M_TEMP, M_WAITOK|M_ZERO);
949ecb9b 943
2281065e
MD
944 /*
945 * Validate the descriptor
946 */
ecda6326
MD
947 if (uap->fd >= 0) {
948 fp = holdfp(p->p_fd, uap->fd, -1);
949 if (fp == NULL) {
950 error = EBADF;
951 goto done;
952 }
953 } else {
954 fp = NULL;
2281065e 955 }
2281065e 956
949ecb9b
MD
957 /*
958 * Execute the internal kernel function and clean up.
959 */
2281065e
MD
960 error = kern_mountctl(path, uap->op, fp, ctl, uap->ctllen, buf, uap->buflen, &uap->sysmsg_result);
961 if (fp)
9f87144f 962 fdrop(fp);
949ecb9b
MD
963 if (error == 0 && uap->sysmsg_result > 0)
964 error = copyout(buf, uap->buf, uap->sysmsg_result);
965done:
966 if (path)
70aac194 967 objcache_put(namei_oc, path);
949ecb9b 968 if (ctl)
efda3bd0 969 kfree(ctl, M_TEMP);
949ecb9b 970 if (buf)
efda3bd0 971 kfree(buf, M_TEMP);
949ecb9b
MD
972 return (error);
973}
974
975/*
976 * Execute a mount control operation by resolving the path to a mount point
977 * and calling vop_mountctl().
978 */
979int
2281065e
MD
980kern_mountctl(const char *path, int op, struct file *fp,
981 const void *ctl, int ctllen,
949ecb9b
MD
982 void *buf, int buflen, int *res)
983{
949ecb9b
MD
984 struct vnode *vp;
985 struct mount *mp;
986 struct nlookupdata nd;
987 int error;
988
989 *res = 0;
990 vp = NULL;
991 error = nlookup_init(&nd, path, UIO_SYSSPACE, NLC_FOLLOW);
992 if (error == 0)
993 error = nlookup(&nd);
994 if (error == 0)
28623bf9 995 error = cache_vget(&nd.nl_nch, nd.nl_cred, LK_EXCLUSIVE, &vp);
949ecb9b
MD
996 nlookup_done(&nd);
997 if (error)
998 return (error);
999
1000 mp = vp->v_mount;
1001
1002 /*
1003 * Must be the root of the filesystem
1004 */
1005 if ((vp->v_flag & VROOT) == 0) {
1006 vput(vp);
1007 return (EINVAL);
1008 }
2281065e 1009 error = vop_mountctl(mp->mnt_vn_use_ops, op, fp, ctl, ctllen,
949ecb9b
MD
1010 buf, buflen, res);
1011 vput(vp);
1012 return (error);
1013}
1014
984263bc 1015int
fad57d0e 1016kern_statfs(struct nlookupdata *nd, struct statfs *buf)
984263bc 1017{
dadab5e9 1018 struct thread *td = curthread;
75ffff0d 1019 struct proc *p = td->td_proc;
41c20dac
MD
1020 struct mount *mp;
1021 struct statfs *sp;
75ffff0d 1022 char *fullpath, *freepath;
984263bc 1023 int error;
984263bc 1024
fad57d0e 1025 if ((error = nlookup(nd)) != 0)
984263bc 1026 return (error);
28623bf9 1027 mp = nd->nl_nch.mount;
984263bc 1028 sp = &mp->mnt_stat;
acde96db 1029 if ((error = VFS_STATFS(mp, sp, nd->nl_cred)) != 0)
984263bc 1030 return (error);
75ffff0d 1031
d3c546e6 1032 error = mount_path(p, mp, &fullpath, &freepath);
75ffff0d
JS
1033 if (error)
1034 return(error);
1035 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
1036 strlcpy(sp->f_mntonname, fullpath, sizeof(sp->f_mntonname));
efda3bd0 1037 kfree(freepath, M_TEMP);
75ffff0d 1038
984263bc 1039 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
9697c509
DRJ
1040 bcopy(sp, buf, sizeof(*buf));
1041 /* Only root should have access to the fsid's. */
1042 if (suser(td))
1043 buf->f_fsid.val[0] = buf->f_fsid.val[1] = 0;
1044 return (0);
984263bc
MD
1045}
1046
1047/*
9697c509 1048 * statfs_args(char *path, struct statfs *buf)
41c20dac 1049 *
984263bc
MD
1050 * Get filesystem statistics.
1051 */
984263bc 1052int
753fd850 1053sys_statfs(struct statfs_args *uap)
9697c509 1054{
fad57d0e 1055 struct nlookupdata nd;
9697c509
DRJ
1056 struct statfs buf;
1057 int error;
1058
fad57d0e
MD
1059 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
1060 if (error == 0)
1061 error = kern_statfs(&nd, &buf);
1062 nlookup_done(&nd);
9697c509
DRJ
1063 if (error == 0)
1064 error = copyout(&buf, uap->buf, sizeof(*uap->buf));
1065 return (error);
1066}
1067
1068int
1069kern_fstatfs(int fd, struct statfs *buf)
984263bc 1070{
dadab5e9
MD
1071 struct thread *td = curthread;
1072 struct proc *p = td->td_proc;
984263bc
MD
1073 struct file *fp;
1074 struct mount *mp;
1fd87d54 1075 struct statfs *sp;
75ffff0d 1076 char *fullpath, *freepath;
984263bc 1077 int error;
984263bc 1078
dadab5e9 1079 KKASSERT(p);
5b287bba 1080 if ((error = holdvnode(p->p_fd, fd, &fp)) != 0)
984263bc
MD
1081 return (error);
1082 mp = ((struct vnode *)fp->f_data)->v_mount;
5b287bba
MD
1083 if (mp == NULL) {
1084 error = EBADF;
1085 goto done;
1086 }
1087 if (fp->f_cred == NULL) {
1088 error = EINVAL;
1089 goto done;
1090 }
984263bc 1091 sp = &mp->mnt_stat;
5b287bba
MD
1092 if ((error = VFS_STATFS(mp, sp, fp->f_cred)) != 0)
1093 goto done;
75ffff0d 1094
d3c546e6 1095 if ((error = mount_path(p, mp, &fullpath, &freepath)) != 0)
5b287bba 1096 goto done;
75ffff0d
JS
1097 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
1098 strlcpy(sp->f_mntonname, fullpath, sizeof(sp->f_mntonname));
efda3bd0 1099 kfree(freepath, M_TEMP);
75ffff0d 1100
984263bc 1101 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
9697c509 1102 bcopy(sp, buf, sizeof(*buf));
75ffff0d 1103
9697c509
DRJ
1104 /* Only root should have access to the fsid's. */
1105 if (suser(td))
1106 buf->f_fsid.val[0] = buf->f_fsid.val[1] = 0;
5b287bba
MD
1107 error = 0;
1108done:
1109 fdrop(fp);
1110 return (error);
9697c509
DRJ
1111}
1112
1113/*
1114 * fstatfs_args(int fd, struct statfs *buf)
1115 *
1116 * Get filesystem statistics.
1117 */
1118int
753fd850 1119sys_fstatfs(struct fstatfs_args *uap)
9697c509
DRJ
1120{
1121 struct statfs buf;
1122 int error;
1123
1124 error = kern_fstatfs(uap->fd, &buf);
1125
1126 if (error == 0)
1127 error = copyout(&buf, uap->buf, sizeof(*uap->buf));
1128 return (error);
984263bc
MD
1129}
1130
1131/*
41c20dac
MD
1132 * getfsstat_args(struct statfs *buf, long bufsize, int flags)
1133 *
984263bc
MD
1134 * Get statistics on all filesystems.
1135 */
861905fb
MD
1136
1137struct getfsstat_info {
1138 struct statfs *sfsp;
1139 long count;
1140 long maxcount;
1141 int error;
1142 int flags;
861905fb
MD
1143 struct proc *p;
1144};
1145
1146static int getfsstat_callback(struct mount *, void *);
1147
41c20dac 1148/* ARGSUSED */
984263bc 1149int
753fd850 1150sys_getfsstat(struct getfsstat_args *uap)
984263bc 1151{
dadab5e9 1152 struct thread *td = curthread;
75ffff0d 1153 struct proc *p = td->td_proc;
861905fb 1154 struct getfsstat_info info;
75ffff0d 1155
861905fb 1156 bzero(&info, sizeof(info));
861905fb
MD
1157
1158 info.maxcount = uap->bufsize / sizeof(struct statfs);
1159 info.sfsp = uap->buf;
1160 info.count = 0;
1161 info.flags = uap->flags;
861905fb
MD
1162 info.p = p;
1163
1164 mountlist_scan(getfsstat_callback, &info, MNTSCAN_FORWARD);
1165 if (info.sfsp && info.count > info.maxcount)
1166 uap->sysmsg_result = info.maxcount;
75ffff0d 1167 else
861905fb
MD
1168 uap->sysmsg_result = info.count;
1169 return (info.error);
1170}
1171
1172static int
1173getfsstat_callback(struct mount *mp, void *data)
1174{
1175 struct getfsstat_info *info = data;
1176 struct statfs *sp;
1177 char *freepath;
1178 char *fullpath;
1179 int error;
1180
1181 if (info->sfsp && info->count < info->maxcount) {
28623bf9 1182 if (info->p && !chroot_visible_mnt(mp, info->p))
861905fb
MD
1183 return(0);
1184 sp = &mp->mnt_stat;
1185
1186 /*
1187 * If MNT_NOWAIT or MNT_LAZY is specified, do not
1188 * refresh the fsstat cache. MNT_NOWAIT or MNT_LAZY
1189 * overrides MNT_WAIT.
1190 */
1191 if (((info->flags & (MNT_LAZY|MNT_NOWAIT)) == 0 ||
1192 (info->flags & MNT_WAIT)) &&
acde96db 1193 (error = VFS_STATFS(mp, sp, info->p->p_ucred))) {
861905fb
MD
1194 return(0);
1195 }
1196 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
1197
d3c546e6 1198 error = mount_path(info->p, mp, &fullpath, &freepath);
861905fb
MD
1199 if (error) {
1200 info->error = error;
1201 return(-1);
984263bc 1202 }
861905fb
MD
1203 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
1204 strlcpy(sp->f_mntonname, fullpath, sizeof(sp->f_mntonname));
efda3bd0 1205 kfree(freepath, M_TEMP);
861905fb
MD
1206
1207 error = copyout(sp, info->sfsp, sizeof(*sp));
1208 if (error) {
1209 info->error = error;
1210 return (-1);
984263bc 1211 }
861905fb 1212 ++info->sfsp;
984263bc 1213 }
861905fb
MD
1214 info->count++;
1215 return(0);
984263bc
MD
1216}
1217
1218/*
41c20dac
MD
1219 * fchdir_args(int fd)
1220 *
984263bc
MD
1221 * Change current working directory to a given file descriptor.
1222 */
984263bc
MD
1223/* ARGSUSED */
1224int
753fd850 1225sys_fchdir(struct fchdir_args *uap)
984263bc 1226{
dadab5e9
MD
1227 struct thread *td = curthread;
1228 struct proc *p = td->td_proc;
41c20dac 1229 struct filedesc *fdp = p->p_fd;
21739618 1230 struct vnode *vp, *ovp;
984263bc
MD
1231 struct mount *mp;
1232 struct file *fp;
28623bf9 1233 struct nchandle nch, onch, tnch;
984263bc
MD
1234 int error;
1235
5b287bba 1236 if ((error = holdvnode(fdp, uap->fd, &fp)) != 0)
984263bc
MD
1237 return (error);
1238 vp = (struct vnode *)fp->f_data;
597aea93 1239 vref(vp);
ca466bae 1240 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
28623bf9 1241 if (vp->v_type != VDIR || fp->f_nchandle.ncp == NULL)
984263bc
MD
1242 error = ENOTDIR;
1243 else
87de5057 1244 error = VOP_ACCESS(vp, VEXEC, p->p_ucred);
984263bc
MD
1245 if (error) {
1246 vput(vp);
5b287bba 1247 fdrop(fp);
984263bc
MD
1248 return (error);
1249 }
28623bf9 1250 cache_copy(&fp->f_nchandle, &nch);
1d505369
MD
1251
1252 /*
1253 * If the ncp has become a mount point, traverse through
1254 * the mount point.
1255 */
1256
28623bf9
MD
1257 while (!error && (nch.ncp->nc_flag & NCF_ISMOUNTPT) &&
1258 (mp = cache_findmount(&nch)) != NULL
1d505369 1259 ) {
28623bf9 1260 error = nlookup_mp(mp, &tnch);
21739618 1261 if (error == 0) {
28623bf9 1262 cache_unlock(&tnch); /* leave ref intact */
21739618 1263 vput(vp);
28623bf9 1264 vp = tnch.ncp->nc_vp;
87de5057 1265 error = vget(vp, LK_SHARED);
21739618 1266 KKASSERT(error == 0);
28623bf9
MD
1267 cache_drop(&nch);
1268 nch = tnch;
21739618
MD
1269 }
1270 }
1271 if (error == 0) {
1272 ovp = fdp->fd_cdir;
28623bf9 1273 onch = fdp->fd_ncdir;
a11aaa81 1274 vn_unlock(vp); /* leave ref intact */
21739618 1275 fdp->fd_cdir = vp;
28623bf9
MD
1276 fdp->fd_ncdir = nch;
1277 cache_drop(&onch);
21739618
MD
1278 vrele(ovp);
1279 } else {
28623bf9 1280 cache_drop(&nch);
21739618
MD
1281 vput(vp);
1282 }
5b287bba 1283 fdrop(fp);
21739618 1284 return (error);
984263bc
MD
1285}
1286
9697c509 1287int
21739618 1288kern_chdir(struct nlookupdata *nd)
9697c509
DRJ
1289{
1290 struct thread *td = curthread;
1291 struct proc *p = td->td_proc;
1292 struct filedesc *fdp = p->p_fd;
21739618 1293 struct vnode *vp, *ovp;
28623bf9 1294 struct nchandle onch;
9697c509
DRJ
1295 int error;
1296
21739618 1297 if ((error = nlookup(nd)) != 0)
9697c509 1298 return (error);
28623bf9 1299 if ((vp = nd->nl_nch.ncp->nc_vp) == NULL)
21739618 1300 return (ENOENT);
87de5057 1301 if ((error = vget(vp, LK_SHARED)) != 0)
21739618
MD
1302 return (error);
1303
1304 error = checkvp_chdir(vp, td);
a11aaa81 1305 vn_unlock(vp);
21739618
MD
1306 if (error == 0) {
1307 ovp = fdp->fd_cdir;
28623bf9
MD
1308 onch = fdp->fd_ncdir;
1309 cache_unlock(&nd->nl_nch); /* leave reference intact */
1310 fdp->fd_ncdir = nd->nl_nch;
21739618 1311 fdp->fd_cdir = vp;
28623bf9 1312 cache_drop(&onch);
21739618 1313 vrele(ovp);
28623bf9 1314 cache_zero(&nd->nl_nch);
21739618
MD
1315 } else {
1316 vrele(vp);
e24b948e 1317 }
e24b948e 1318 return (error);
9697c509
DRJ
1319}
1320
984263bc 1321/*
41c20dac
MD
1322 * chdir_args(char *path)
1323 *
984263bc
MD
1324 * Change current working directory (``.'').
1325 */
984263bc 1326int
753fd850 1327sys_chdir(struct chdir_args *uap)
984263bc 1328{
21739618 1329 struct nlookupdata nd;
9697c509 1330 int error;
984263bc 1331
21739618 1332 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
fad57d0e 1333 if (error == 0)
21739618 1334 error = kern_chdir(&nd);
fad57d0e 1335 nlookup_done(&nd);
9697c509 1336 return (error);
984263bc
MD
1337}
1338
1339/*
1340 * Helper function for raised chroot(2) security function: Refuse if
1341 * any filedescriptors are open directories.
1342 */
1343static int
c972a82f 1344chroot_refuse_vdir_fds(struct filedesc *fdp)
984263bc
MD
1345{
1346 struct vnode *vp;
1347 struct file *fp;
1348 int error;
1349 int fd;
1350
1351 for (fd = 0; fd < fdp->fd_nfiles ; fd++) {
5b287bba 1352 if ((error = holdvnode(fdp, fd, &fp)) != 0)
984263bc
MD
1353 continue;
1354 vp = (struct vnode *)fp->f_data;
5b287bba
MD
1355 if (vp->v_type != VDIR) {
1356 fdrop(fp);
984263bc 1357 continue;
5b287bba
MD
1358 }
1359 fdrop(fp);
984263bc
MD
1360 return(EPERM);
1361 }
1362 return (0);
1363}
1364
1365/*
1366 * This sysctl determines if we will allow a process to chroot(2) if it
1367 * has a directory open:
1368 * 0: disallowed for all processes.
1369 * 1: allowed for processes that were not already chroot(2)'ed.
1370 * 2: allowed for all processes.
1371 */
1372
1373static int chroot_allow_open_directories = 1;
1374
1375SYSCTL_INT(_kern, OID_AUTO, chroot_allow_open_directories, CTLFLAG_RW,
1376 &chroot_allow_open_directories, 0, "");
1377
e24b948e 1378/*
21739618
MD
1379 * chroot to the specified namecache entry. We obtain the vp from the
1380 * namecache data. The passed ncp must be locked and referenced and will
1381 * remain locked and referenced on return.
e24b948e 1382 */
53dd6631 1383int
28623bf9 1384kern_chroot(struct nchandle *nch)
e24b948e
MD
1385{
1386 struct thread *td = curthread;
1387 struct proc *p = td->td_proc;
1388 struct filedesc *fdp = p->p_fd;
21739618 1389 struct vnode *vp;
e24b948e
MD
1390 int error;
1391
1392 /*
1393 * Only root can chroot
1394 */
1395 if ((error = suser_cred(p->p_ucred, PRISON_ROOT)) != 0)
1396 return (error);
1397
1398 /*
1399 * Disallow open directory descriptors (fchdir() breakouts).
1400 */
1401 if (chroot_allow_open_directories == 0 ||
1402 (chroot_allow_open_directories == 1 && fdp->fd_rdir != rootvnode)) {
1403 if ((error = chroot_refuse_vdir_fds(fdp)) != 0)
1404 return (error);
1405 }
28623bf9 1406 if ((vp = nch->ncp->nc_vp) == NULL)
21739618
MD
1407 return (ENOENT);
1408
87de5057 1409 if ((error = vget(vp, LK_SHARED)) != 0)
21739618 1410 return (error);
e24b948e
MD
1411
1412 /*
1413 * Check the validity of vp as a directory to change to and
1414 * associate it with rdir/jdir.
1415 */
21739618 1416 error = checkvp_chdir(vp, td);
a11aaa81 1417 vn_unlock(vp); /* leave reference intact */
21739618 1418 if (error == 0) {
e24b948e 1419 vrele(fdp->fd_rdir);
21739618 1420 fdp->fd_rdir = vp; /* reference inherited by fd_rdir */
28623bf9
MD
1421 cache_drop(&fdp->fd_nrdir);
1422 cache_copy(nch, &fdp->fd_nrdir);
e24b948e
MD
1423 if (fdp->fd_jdir == NULL) {
1424 fdp->fd_jdir = vp;
597aea93 1425 vref(fdp->fd_jdir);
28623bf9 1426 cache_copy(nch, &fdp->fd_njdir);
e24b948e 1427 }
21739618
MD
1428 } else {
1429 vrele(vp);
e24b948e
MD
1430 }
1431 return (error);
1432}
1433
984263bc 1434/*
41c20dac
MD
1435 * chroot_args(char *path)
1436 *
984263bc
MD
1437 * Change notion of root (``/'') directory.
1438 */
984263bc
MD
1439/* ARGSUSED */
1440int
753fd850 1441sys_chroot(struct chroot_args *uap)
984263bc 1442{
dadab5e9 1443 struct thread *td = curthread;
21739618 1444 struct nlookupdata nd;
e24b948e 1445 int error;
984263bc 1446
e24b948e 1447 KKASSERT(td->td_proc);
21739618 1448 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
53dd6631
JS
1449 if (error) {
1450 nlookup_done(&nd);
1451 return(error);
1452 }
1453 error = nlookup(&nd);
1454 if (error == 0)
28623bf9 1455 error = kern_chroot(&nd.nl_nch);
fad57d0e 1456 nlookup_done(&nd);
53dd6631 1457 return(error);
984263bc
MD
1458}
1459
1460/*
e24b948e
MD
1461 * Common routine for chroot and chdir. Given a locked, referenced vnode,
1462 * determine whether it is legal to chdir to the vnode. The vnode's state
1463 * is not changed by this call.
984263bc 1464 */
e24b948e
MD
1465int
1466checkvp_chdir(struct vnode *vp, struct thread *td)
984263bc 1467{
984263bc
MD
1468 int error;
1469
984263bc
MD
1470 if (vp->v_type != VDIR)
1471 error = ENOTDIR;
1472 else
87de5057 1473 error = VOP_ACCESS(vp, VEXEC, td->td_proc->p_ucred);
984263bc
MD
1474 return (error);
1475}
1476
984263bc 1477int
fad57d0e 1478kern_open(struct nlookupdata *nd, int oflags, int mode, int *res)
984263bc 1479{
dadab5e9
MD
1480 struct thread *td = curthread;
1481 struct proc *p = td->td_proc;
fbfe4e7d 1482 struct lwp *lp = td->td_lwp;
41c20dac 1483 struct filedesc *fdp = p->p_fd;
9697c509 1484 int cmode, flags;
984263bc 1485 struct file *nfp;
fad57d0e
MD
1486 struct file *fp;
1487 struct vnode *vp;
984263bc
MD
1488 int type, indx, error;
1489 struct flock lf;
984263bc 1490
984263bc
MD
1491 if ((oflags & O_ACCMODE) == O_ACCMODE)
1492 return (EINVAL);
1493 flags = FFLAGS(oflags);
fad57d0e 1494 error = falloc(p, &nfp, NULL);
984263bc
MD
1495 if (error)
1496 return (error);
1497 fp = nfp;
9697c509 1498 cmode = ((mode &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT;
fad57d0e 1499
984263bc 1500 /*
fad57d0e
MD
1501 * XXX p_dupfd is a real mess. It allows a device to return a
1502 * file descriptor to be duplicated rather then doing the open
1503 * itself.
984263bc 1504 */
fbfe4e7d 1505 lp->lwp_dupfd = -1;
21739618
MD
1506
1507 /*
fad57d0e
MD
1508 * Call vn_open() to do the lookup and assign the vnode to the
1509 * file pointer. vn_open() does not change the ref count on fp
1510 * and the vnode, on success, will be inherited by the file pointer
1511 * and unlocked.
21739618 1512 */
fad57d0e
MD
1513 nd->nl_flags |= NLC_LOCKVP;
1514 error = vn_open(nd, fp, flags, cmode);
1515 nlookup_done(nd);
984263bc 1516 if (error) {
984263bc
MD
1517 /*
1518 * handle special fdopen() case. bleh. dupfdopen() is
1519 * responsible for dropping the old contents of ofiles[indx]
1520 * if it succeeds.
fad57d0e 1521 *
259b8ea0
MD
1522 * Note that fsetfd() will add a ref to fp which represents
1523 * the fd_files[] assignment. We must still drop our
1524 * reference.
984263bc 1525 */
fbfe4e7d 1526 if ((error == ENODEV || error == ENXIO) && lp->lwp_dupfd >= 0) {
259b8ea0
MD
1527 if (fdalloc(p, 0, &indx) == 0) {
1528 error = dupfdopen(p, indx, lp->lwp_dupfd, flags, error);
fad57d0e
MD
1529 if (error == 0) {
1530 *res = indx;
9f87144f 1531 fdrop(fp); /* our ref */
fad57d0e
MD
1532 return (0);
1533 }
259b8ea0 1534 fsetfd(p, NULL, indx);
fad57d0e 1535 }
984263bc 1536 }
9f87144f 1537 fdrop(fp); /* our ref */
984263bc
MD
1538 if (error == ERESTART)
1539 error = EINTR;
1540 return (error);
1541 }
fad57d0e
MD
1542
1543 /*
1544 * ref the vnode for ourselves so it can't be ripped out from under
1545 * is. XXX need an ND flag to request that the vnode be returned
1546 * anyway.
259b8ea0
MD
1547 *
1548 * Reserve a file descriptor but do not assign it until the open
1549 * succeeds.
fad57d0e
MD
1550 */
1551 vp = (struct vnode *)fp->f_data;
1552 vref(vp);
259b8ea0 1553 if ((error = fdalloc(p, 0, &indx)) != 0) {
9f87144f 1554 fdrop(fp);
fad57d0e
MD
1555 vrele(vp);
1556 return (error);
1557 }
1558
1559 /*
1560 * If no error occurs the vp will have been assigned to the file
1561 * pointer.
1562 */
fbfe4e7d 1563 lp->lwp_dupfd = 0;
984263bc 1564
984263bc
MD
1565 if (flags & (O_EXLOCK | O_SHLOCK)) {
1566 lf.l_whence = SEEK_SET;
1567 lf.l_start = 0;
1568 lf.l_len = 0;
1569 if (flags & O_EXLOCK)
1570 lf.l_type = F_WRLCK;
1571 else
1572 lf.l_type = F_RDLCK;
71c18fe3
MD
1573 if (flags & FNONBLOCK)
1574 type = 0;
1575 else
1576 type = F_WAIT;
fad57d0e 1577
984263bc
MD
1578 if ((error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type)) != 0) {
1579 /*
259b8ea0
MD
1580 * lock request failed. Clean up the reserved
1581 * descriptor.
984263bc 1582 */
fad57d0e 1583 vrele(vp);
259b8ea0 1584 fsetfd(p, NULL, indx);
9f87144f 1585 fdrop(fp);
984263bc
MD
1586 return (error);
1587 }
984263bc
MD
1588 fp->f_flag |= FHASLOCK;
1589 }
7540ab49
MD
1590#if 0
1591 /*
1592 * Assert that all regular file vnodes were created with a object.
1593 */
1594 KASSERT(vp->v_type != VREG || vp->v_object != NULL,
1595 ("open: regular file has no backing object after vn_open"));
1596#endif
984263bc 1597
fad57d0e 1598 vrele(vp);
21739618 1599
984263bc
MD
1600 /*
1601 * release our private reference, leaving the one associated with the
1602 * descriptor table intact.
1603 */
259b8ea0 1604 fsetfd(p, fp, indx);
9f87144f 1605 fdrop(fp);
9697c509 1606 *res = indx;
984263bc
MD
1607 return (0);
1608}
1609
984263bc 1610/*
9697c509 1611 * open_args(char *path, int flags, int mode)
41c20dac 1612 *
9697c509
DRJ
1613 * Check permissions, allocate an open file structure,
1614 * and call the device open routine if any.
984263bc 1615 */
984263bc 1616int
753fd850 1617sys_open(struct open_args *uap)
984263bc 1618{
fad57d0e 1619 struct nlookupdata nd;
9697c509
DRJ
1620 int error;
1621
fad57d0e
MD
1622 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
1623 if (error == 0) {
1624 error = kern_open(&nd, uap->flags,
1625 uap->mode, &uap->sysmsg_result);
1626 }
1627 nlookup_done(&nd);
9697c509 1628 return (error);
984263bc 1629}
984263bc 1630
984263bc 1631int
0e9b9130 1632kern_mknod(struct nlookupdata *nd, int mode, int rmajor, int rminor)
984263bc 1633{
dadab5e9
MD
1634 struct thread *td = curthread;
1635 struct proc *p = td->td_proc;
41c20dac 1636 struct vnode *vp;
984263bc
MD
1637 struct vattr vattr;
1638 int error;
1639 int whiteout = 0;
984263bc 1640
dadab5e9
MD
1641 KKASSERT(p);
1642
9697c509 1643 switch (mode & S_IFMT) {
984263bc
MD
1644 case S_IFCHR:
1645 case S_IFBLK:
dadab5e9 1646 error = suser(td);
984263bc
MD
1647 break;
1648 default:
dadab5e9 1649 error = suser_cred(p->p_ucred, PRISON_ROOT);
984263bc
MD
1650 break;
1651 }
1652 if (error)
1653 return (error);
fad57d0e 1654
984263bc 1655 bwillwrite();
5312fa43 1656 nd->nl_flags |= NLC_CREATE | NLC_REFDVP;
fad57d0e 1657 if ((error = nlookup(nd)) != 0)
984263bc 1658 return (error);
28623bf9 1659 if (nd->nl_nch.ncp->nc_vp)
fad57d0e 1660 return (EEXIST);
28623bf9 1661 if ((error = ncp_writechk(&nd->nl_nch)) != 0)
72310cfb 1662 return (error);
984263bc 1663
fad57d0e
MD
1664 VATTR_NULL(&vattr);
1665 vattr.va_mode = (mode & ALLPERMS) &~ p->p_fd->fd_cmask;
0e9b9130
MD
1666 vattr.va_rmajor = rmajor;
1667 vattr.va_rminor = rminor;
fad57d0e
MD
1668 whiteout = 0;
1669
1670 switch (mode & S_IFMT) {
1671 case S_IFMT: /* used by badsect to flag bad sectors */
1672 vattr.va_type = VBAD;
1673 break;
1674 case S_IFCHR:
1675 vattr.va_type = VCHR;
1676 break;
1677 case S_IFBLK:
1678 vattr.va_type = VBLK;
1679 break;
1680 case S_IFWHT:
1681 whiteout = 1;
1682 break;
1683 default:
1684 error = EINVAL;
1685 break;
984263bc 1686 }
9697c509 1687 if (error == 0) {
fad57d0e 1688 if (whiteout) {
5312fa43
MD
1689 error = VOP_NWHITEOUT(&nd->nl_nch, nd->nl_dvp,
1690 nd->nl_cred, NAMEI_CREATE);
fad57d0e
MD
1691 } else {
1692 vp = NULL;
5312fa43
MD
1693 error = VOP_NMKNOD(&nd->nl_nch, nd->nl_dvp,
1694 &vp, nd->nl_cred, &vattr);
984263bc 1695 if (error == 0)
fad57d0e 1696 vput(vp);
984263bc 1697 }
984263bc 1698 }
9697c509
DRJ
1699 return (error);
1700}
1701
1702/*
1703 * mknod_args(char *path, int mode, int dev)
1704 *
1705 * Create a special file.
1706 */
1707int
753fd850 1708sys_mknod(struct mknod_args *uap)
9697c509 1709{
fad57d0e 1710 struct nlookupdata nd;
9697c509
DRJ
1711 int error;
1712
fad57d0e 1713 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0);
0e9b9130
MD
1714 if (error == 0) {
1715 error = kern_mknod(&nd, uap->mode,
1716 umajor(uap->dev), uminor(uap->dev));
1717 }
fad57d0e 1718 nlookup_done(&nd);
984263bc
MD
1719 return (error);
1720}
1721
984263bc 1722int
fad57d0e 1723kern_mkfifo(struct nlookupdata *nd, int mode)
984263bc 1724{
dadab5e9
MD
1725 struct thread *td = curthread;
1726 struct proc *p = td->td_proc;
984263bc 1727 struct vattr vattr;
fad57d0e 1728 struct vnode *vp;
984263bc 1729 int error;
984263bc
MD
1730
1731 bwillwrite();
fad57d0e 1732
5312fa43 1733 nd->nl_flags |= NLC_CREATE | NLC_REFDVP;
fad57d0e 1734 if ((error = nlookup(nd)) != 0)
984263bc 1735 return (error);
28623bf9 1736 if (nd->nl_nch.ncp->nc_vp)
984263bc 1737 return (EEXIST);
28623bf9 1738 if ((error = ncp_writechk(&nd->nl_nch)) != 0)
72310cfb 1739 return (error);
fad57d0e 1740
984263bc
MD
1741 VATTR_NULL(&vattr);
1742 vattr.va_type = VFIFO;
136178b3 1743 vattr.va_mode = (mode & ALLPERMS) &~ p->p_fd->fd_cmask;
fad57d0e 1744 vp = NULL;
5312fa43 1745 error = VOP_NMKNOD(&nd->nl_nch, nd->nl_dvp, &vp, nd->nl_cred, &vattr);
984263bc 1746 if (error == 0)
fad57d0e 1747 vput(vp);
136178b3
DRJ
1748 return (error);
1749}
1750
1751/*
1752 * mkfifo_args(char *path, int mode)
1753 *
1754 * Create a named pipe.
1755 */
1756int
753fd850 1757sys_mkfifo(struct mkfifo_args *uap)
136178b3 1758{
fad57d0e 1759 struct nlookupdata nd;
136178b3
DRJ
1760 int error;
1761
fad57d0e
MD
1762 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0);
1763 if (error == 0)
1764 error = kern_mkfifo(&nd, uap->mode);
1765 nlookup_done(&nd);
984263bc
MD
1766 return (error);
1767}
1768
8c40f81e 1769static int hardlink_check_uid = 0;
43a0f7ae 1770SYSCTL_INT(_security, OID_AUTO, hardlink_check_uid, CTLFLAG_RW,
8c40f81e
MD
1771 &hardlink_check_uid, 0,
1772 "Unprivileged processes cannot create hard links to files owned by other "
1773 "users");
1774static int hardlink_check_gid = 0;
43a0f7ae 1775SYSCTL_INT(_security, OID_AUTO, hardlink_check_gid, CTLFLAG_RW,
8c40f81e
MD
1776 &hardlink_check_gid, 0,
1777 "Unprivileged processes cannot create hard links to files owned by other "
1778 "groups");
1779
1780static int
1781can_hardlink(struct vnode *vp, struct thread *td, struct ucred *cred)
1782{
1783 struct vattr va;
1784 int error;
1785
1786 /*
1787 * Shortcut if disabled
1788 */
1789 if (hardlink_check_uid == 0 && hardlink_check_gid == 0)
1790 return (0);
1791
1792 /*
1793 * root cred can always hardlink
1794 */
1795 if (suser_cred(cred, PRISON_ROOT) == 0)
1796 return (0);
1797
1798 /*
1799 * Otherwise only if the originating file is owned by the
1800 * same user or group. Note that any group is allowed if
1801 * the file is owned by the caller.
1802 */
87de5057 1803 error = VOP_GETATTR(vp, &va);
8c40f81e
MD
1804 if (error != 0)
1805 return (error);
1806
1807 if (hardlink_check_uid) {
1808 if (cred->cr_uid != va.va_uid)
1809 return (EPERM);
1810 }
1811
1812 if (hardlink_check_gid) {
1813 if (cred->cr_uid != va.va_uid && !groupmember(va.va_gid, cred))
1814 return (EPERM);
1815 }
1816
1817 return (0);
1818}
1819
984263bc 1820int
fad57d0e 1821kern_link(struct nlookupdata *nd, struct nlookupdata *linknd)
984263bc 1822{
dadab5e9 1823 struct thread *td = curthread;
41c20dac 1824 struct vnode *vp;
984263bc
MD
1825 int error;
1826
fad57d0e
MD
1827 /*
1828 * Lookup the source and obtained a locked vnode.
1829 *
1830 * XXX relookup on vget failure / race ?
1831 */
984263bc 1832 bwillwrite();
fad57d0e 1833 if ((error = nlookup(nd)) != 0)
984263bc 1834 return (error);
28623bf9 1835 vp = nd->nl_nch.ncp->nc_vp;
fad57d0e 1836 KKASSERT(vp != NULL);
984263bc 1837 if (vp->v_type == VDIR)
fad57d0e 1838 return (EPERM); /* POSIX */
28623bf9 1839 if ((error = ncp_writechk(&nd->nl_nch)) != 0)
72310cfb 1840 return (error);
87de5057 1841 if ((error = vget(vp, LK_EXCLUSIVE)) != 0)
fad57d0e
MD
1842 return (error);
1843
1844 /*
1845 * Unlock the source so we can lookup the target without deadlocking
1846 * (XXX vp is locked already, possible other deadlock?). The target
1847 * must not exist.
1848 */
1849 KKASSERT(nd->nl_flags & NLC_NCPISLOCKED);
1850 nd->nl_flags &= ~NLC_NCPISLOCKED;
28623bf9 1851 cache_unlock(&nd->nl_nch);
fad57d0e 1852
5312fa43 1853 linknd->nl_flags |= NLC_CREATE | NLC_REFDVP;
fad57d0e
MD
1854 if ((error = nlookup(linknd)) != 0) {
1855 vput(vp);
1856 return (error);
984263bc 1857 }
28623bf9 1858 if (linknd->nl_nch.ncp->nc_vp) {
fad57d0e
MD
1859 vput(vp);
1860 return (EEXIST);
1861 }
1862
1863 /*
1864 * Finally run the new API VOP.
1865 */
8c40f81e 1866 error = can_hardlink(vp, td, td->td_proc->p_ucred);
5312fa43
MD
1867 if (error == 0) {
1868 error = VOP_NLINK(&linknd->nl_nch, linknd->nl_dvp,
1869 vp, linknd->nl_cred);
1870 }
fad57d0e 1871 vput(vp);
984263bc
MD
1872 return (error);
1873}
1874
1875/*
9697c509 1876 * link_args(char *path, char *link)
41c20dac 1877 *
9697c509 1878 * Make a hard file link.
984263bc 1879 */
984263bc 1880int
753fd850 1881sys_link(struct link_args *uap)
9697c509 1882{
fad57d0e 1883 struct nlookupdata nd, linknd;
9697c509
DRJ
1884 int error;
1885
fad57d0e
MD
1886 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
1887 if (error == 0) {
1888 error = nlookup_init(&linknd, uap->link, UIO_USERSPACE, 0);
1889 if (error == 0)
1890 error = kern_link(&nd, &linknd);
1891 nlookup_done(&linknd);
1892 }
1893 nlookup_done(&nd);
9697c509
DRJ
1894 return (error);
1895}
1896
1897int
fad57d0e 1898kern_symlink(struct nlookupdata *nd, char *path, int mode)
984263bc
MD
1899{
1900 struct vattr vattr;
fad57d0e 1901 struct vnode *vp;
dff430ab 1902 struct vnode *dvp;
984263bc 1903 int error;
984263bc 1904
984263bc 1905 bwillwrite();
5312fa43 1906 nd->nl_flags |= NLC_CREATE | NLC_REFDVP;
fad57d0e 1907 if ((error = nlookup(nd)) != 0)
9697c509 1908 return (error);
28623bf9 1909 if (nd->nl_nch.ncp->nc_vp)
9697c509 1910 return (EEXIST);
28623bf9 1911 if ((error = ncp_writechk(&nd->nl_nch)) != 0)
72310cfb 1912 return (error);
5312fa43 1913 dvp = nd->nl_dvp;
984263bc 1914 VATTR_NULL(&vattr);
fad57d0e 1915 vattr.va_mode = mode;
dff430ab 1916 error = VOP_NSYMLINK(&nd->nl_nch, dvp, &vp, nd->nl_cred, &vattr, path);
984263bc 1917 if (error == 0)
fad57d0e 1918 vput(vp);
9697c509
DRJ
1919 return (error);
1920}
1921
1922/*
1923 * symlink(char *path, char *link)
1924 *
1925 * Make a symbolic link.
1926 */
1927int
753fd850 1928sys_symlink(struct symlink_args *uap)
9697c509
DRJ
1929{
1930 struct thread *td = curthread;
fad57d0e 1931 struct nlookupdata nd;
9697c509
DRJ
1932 char *path;
1933 int error;
fad57d0e 1934 int mode;
9697c509 1935
70aac194 1936 path = objcache_get(namei_oc, M_WAITOK);
9697c509 1937 error = copyinstr(uap->path, path, MAXPATHLEN, NULL);
e24b948e 1938 if (error == 0) {
fad57d0e
MD
1939 error = nlookup_init(&nd, uap->link, UIO_USERSPACE, 0);
1940 if (error == 0) {
1941 mode = ACCESSPERMS & ~td->td_proc->p_fd->fd_cmask;
1942 error = kern_symlink(&nd, path, mode);
1943 }
1944 nlookup_done(&nd);
e24b948e 1945 }
70aac194 1946 objcache_put(namei_oc, path);
984263bc
MD
1947 return (error);
1948}
1949
1950/*
41c20dac
MD
1951 * undelete_args(char *path)
1952 *
984263bc
MD
1953 * Delete a whiteout from the filesystem.
1954 */
1955/* ARGSUSED */
1956int
753fd850 1957sys_undelete(struct undelete_args *uap)
984263bc 1958{
fad57d0e 1959 struct nlookupdata nd;
984263bc 1960 int error;
984263bc 1961
ab2eb4eb 1962 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0);
984263bc 1963 bwillwrite();
5312fa43 1964 nd.nl_flags |= NLC_DELETE | NLC_REFDVP;
fad57d0e
MD
1965 if (error == 0)
1966 error = nlookup(&nd);
72310cfb 1967 if (error == 0)
28623bf9 1968 error = ncp_writechk(&nd.nl_nch);
dff430ab 1969 if (error == 0) {
5312fa43
MD
1970 error = VOP_NWHITEOUT(&nd.nl_nch, nd.nl_dvp, nd.nl_cred,
1971 NAMEI_DELETE);
dff430ab 1972 }
fad57d0e 1973 nlookup_done(&nd);
984263bc
MD
1974 return (error);
1975}
1976
984263bc 1977int
fad57d0e 1978kern_unlink(struct nlookupdata *nd)
984263bc 1979{
984263bc 1980 int error;
984263bc
MD
1981
1982 bwillwrite();
5312fa43 1983 nd->nl_flags |= NLC_DELETE | NLC_REFDVP;
fad57d0e 1984 if ((error = nlookup(nd)) != 0)
984263bc 1985 return (error);
28623bf9 1986 if ((error = ncp_writechk(&nd->nl_nch)) != 0)
72310cfb 1987 return (error);
5312fa43 1988 error = VOP_NREMOVE(&nd->nl_nch, nd->nl_dvp, nd->nl_cred);
984263bc
MD
1989 return (error);
1990}
1991
1992/*
9697c509 1993 * unlink_args(char *path)
41c20dac 1994 *
9697c509 1995 * Delete a name from the filesystem.
984263bc 1996 */
984263bc 1997int
753fd850 1998sys_unlink(struct unlink_args *uap)
9697c509 1999{
fad57d0e 2000 struct nlookupdata nd;
9697c509
DRJ
2001 int error;
2002
fad57d0e
MD
2003 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0);
2004 if (error == 0)
2005 error = kern_unlink(&nd);
2006 nlookup_done(&nd);
9697c509
DRJ
2007 return (error);
2008}
2009
2010int
5a3fe67d 2011kern_lseek(int fd, off_t offset, int whence, off_t *res)
984263bc 2012{
dadab5e9
MD
2013 struct thread *td = curthread;
2014 struct proc *p = td->td_proc;
41c20dac 2015 struct file *fp;
984263bc
MD
2016 struct vattr vattr;
2017 int error;
2018
228b401d
MD
2019 fp = holdfp(p->p_fd, fd, -1);
2020 if (fp == NULL)
984263bc 2021 return (EBADF);
228b401d
MD
2022 if (fp->f_type != DTYPE_VNODE) {
2023 error = ESPIPE;
2024 goto done;
2025 }
2026
9697c509 2027 switch (whence) {
984263bc 2028 case L_INCR:
9697c509 2029 fp->f_offset += offset;
228b401d 2030 error = 0;
984263bc
MD
2031 break;
2032 case L_XTND:
228b401d
MD
2033 error = VOP_GETATTR((struct vnode *)fp->f_data, &vattr);
2034 if (error == 0)
2035 fp->f_offset = offset + vattr.va_size;
984263bc
MD
2036 break;
2037 case L_SET:
9697c509 2038 fp->f_offset = offset;
228b401d 2039 error = 0;
984263bc
MD
2040 break;
2041 default:
228b401d
MD
2042 error = EINVAL;
2043 break;
984263bc 2044 }
9697c509 2045 *res = fp->f_offset;
228b401d
MD
2046done:
2047 fdrop(fp);
2048 return (error);
984263bc
MD
2049}
2050
984263bc 2051/*
9697c509 2052 * lseek_args(int fd, int pad, off_t offset, int whence)
41c20dac 2053 *
9697c509 2054 * Reposition read/write file offset.
984263bc 2055 */
984263bc 2056int
753fd850 2057sys_lseek(struct lseek_args *uap)
984263bc 2058{
984263bc
MD
2059 int error;
2060
9697c509 2061 error = kern_lseek(uap->fd, uap->offset, uap->whence,
5a3fe67d 2062 &uap->sysmsg_offset);
9697c509 2063
984263bc
MD
2064 return (error);
2065}
984263bc 2066
984263bc 2067int
fad57d0e 2068kern_access(struct nlookupdata *nd, int aflags)
984263bc 2069{
41c20dac 2070 struct vnode *vp;
984263bc 2071 int error, flags;
984263bc 2072
fad57d0e
MD
2073 if ((error = nlookup(nd)) != 0)
2074 return (error);
806dcf9a 2075retry:
28623bf9 2076 error = cache_vget(&nd->nl_nch, nd->nl_cred, LK_EXCLUSIVE, &vp);
9697c509 2077 if (error)
fad57d0e 2078 return (error);
984263bc
MD
2079
2080 /* Flags == 0 means only check for existence. */
9697c509 2081 if (aflags) {
984263bc 2082 flags = 0;
9697c509 2083 if (aflags & R_OK)
984263bc 2084 flags |= VREAD;
9697c509 2085 if (aflags & W_OK)
984263bc 2086 flags |= VWRITE;
9697c509 2087 if (aflags & X_OK)
984263bc 2088 flags |= VEXEC;
468bb1f9 2089 if ((flags & VWRITE) == 0 ||
28623bf9 2090 (error = vn_writechk(vp, &nd->nl_nch)) == 0)
87de5057 2091 error = VOP_ACCESS(vp, flags, nd->nl_cred);
806dcf9a
MD
2092
2093 /*
2094 * If the file handle is stale we have to re-resolve the
2095 * entry. This is a hack at the moment.
2096 */
2097 if (error == ESTALE) {
5e1a76ea 2098 vput(vp);
28623bf9
MD
2099 cache_setunresolved(&nd->nl_nch);
2100 error = cache_resolve(&nd->nl_nch, nd->nl_cred);
806dcf9a 2101 if (error == 0) {
806dcf9a
MD
2102 vp = NULL;
2103 goto retry;
2104 }
5e1a76ea 2105 return(error);
806dcf9a 2106 }
984263bc 2107 }
984263bc 2108 vput(vp);
984263bc
MD
2109 return (error);
2110}
2111
984263bc 2112/*
9697c509 2113 * access_args(char *path, int flags)
41c20dac 2114 *
9697c509 2115 * Check access permissions.
984263bc 2116 */
984263bc 2117int
753fd850 2118sys_access(struct access_args *uap)
984263bc 2119{
fad57d0e 2120 struct nlookupdata nd;
9697c509 2121 int error;
984263bc 2122
fad57d0e
MD
2123 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
2124 if (error == 0)
2125 error = kern_access(&nd, uap->flags);
2126 nlookup_done(&nd);
984263bc
MD
2127 return (error);
2128}
2129
984263bc 2130int
21739618 2131kern_stat(struct nlookupdata *nd, struct stat *st)
984263bc 2132{
984263bc 2133 int error;
21739618
MD
2134 struct vnode *vp;
2135 thread_t td;
984263bc 2136
21739618 2137 if ((error = nlookup(nd)) != 0)
984263bc 2138 return (error);
806dcf9a 2139again:
28623bf9 2140 if ((vp = nd->nl_nch.ncp->nc_vp) == NULL)
21739618
MD
2141 return (ENOENT);
2142
2143 td = curthread;
87de5057 2144 if ((error = vget(vp, LK_SHARED)) != 0)
21739618 2145 return (error);
87de5057 2146 error = vn_stat(vp, st, nd->nl_cred);
806dcf9a
MD
2147
2148 /*
2149 * If the file handle is stale we have to re-resolve the entry. This
2150 * is a hack at the moment.
2151 */
2152 if (error == ESTALE) {
5dc91765 2153 vput(vp);
28623bf9
MD
2154 cache_setunresolved(&nd->nl_nch);
2155 error = cache_resolve(&nd->nl_nch, nd->nl_cred);
5dc91765 2156 if (error == 0)
806dcf9a 2157 goto again;
5dc91765
MD
2158 } else {
2159 vput(vp);
806dcf9a 2160 }
984263bc
MD
2161 return (error);
2162}
2163
984263bc 2164/*
41c20dac
MD
2165 * stat_args(char *path, struct stat *ub)
2166 *
984263bc
MD
2167 * Get file status; this version follows links.
2168 */
984263bc 2169int
753fd850 2170sys_stat(struct stat_args *uap)
984263bc 2171{
21739618 2172 struct nlookupdata nd;
9697c509
DRJ
2173 struct stat st;
2174 int error;
984263bc 2175
21739618
MD
2176 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
2177 if (error == 0) {
2178 error = kern_stat(&nd, &st);
2179 if (error == 0)
2180 error = copyout(&st, uap->ub, sizeof(*uap->ub));
21739618 2181 }
fad57d0e 2182 nlookup_done(&nd);
984263bc
MD
2183 return (error);
2184}
2185
2186/*
41c20dac
MD
2187 * lstat_args(char *path, struct stat *ub)
2188 *
984263bc
MD
2189 * Get file status; this version does not follow links.
2190 */
984263bc 2191int
753fd850 2192sys_lstat(struct lstat_args *uap)
984263bc 2193{
21739618 2194 struct nlookupdata nd;
9697c509
DRJ
2195 struct stat st;
2196 int error;
984263bc 2197
21739618
MD
2198 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0);
2199 if (error == 0) {
2200 error = kern_stat(&nd, &st);
2201 if (error == 0)
2202 error = copyout(&st, uap->ub, sizeof(*uap->ub));
21739618 2203 }
fad57d0e 2204 nlookup_done(&nd);
984263bc
MD
2205 return (error);
2206}
2207
984263bc 2208/*
41c20dac
MD
2209 * pathconf_Args(char *path, int name)
2210 *
984263bc
MD
2211 * Get configurable pathname variables.
2212 */
984263bc
MD
2213/* ARGSUSED */
2214int
753fd850 2215sys_pathconf(struct pathconf_args *uap)
984263bc 2216{
fad57d0e
MD
2217 struct nlookupdata nd;
2218 struct vnode *vp;
984263bc 2219 int error;
984263bc 2220
fad57d0e 2221 vp = NULL;
ab2eb4eb 2222 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
fad57d0e
MD
2223 if (error == 0)
2224 error = nlookup(&nd);
2225 if (error == 0)
28623bf9 2226 error = cache_vget(&nd.nl_nch, nd.nl_cred, LK_EXCLUSIVE, &vp);
fad57d0e
MD
2227 nlookup_done(&nd);
2228 if (error == 0) {
ab2eb4eb 2229 error = VOP_PATHCONF(vp, uap->name, uap->sysmsg_fds);
fad57d0e
MD
2230 vput(vp);
2231 }
984263bc
MD
2232 return (error);
2233}
2234
bbab27f6
DRJ
2235/*
2236 * XXX: daver
2237 * kern_readlink isn't properly split yet. There is a copyin burried
2238 * in VOP_READLINK().
2239 */
984263bc 2240int
fad57d0e 2241kern_readlink(struct nlookupdata *nd, char *buf, int count, int *res)
984263bc 2242{
dadab5e9
MD
2243 struct thread *td = curthread;
2244 struct proc *p = td->td_proc;
41c20dac 2245 struct vnode *vp;
984263bc
MD
2246 struct iovec aiov;
2247 struct uio auio;
2248 int error;
984263bc 2249
fad57d0e
MD
2250 if ((error = nlookup(nd)) != 0)
2251 return (error);
28623bf9 2252 error = cache_vget(&nd->nl_nch, nd->nl_cred, LK_EXCLUSIVE, &vp);
9697c509 2253 if (error)
984263bc 2254 return (error);
fad57d0e 2255 if (vp->v_type != VLNK) {
984263bc 2256 error = EINVAL;
fad57d0e 2257 } else {
9697c509
DRJ
2258 aiov.iov_base = buf;
2259 aiov.iov_len = count;
984263bc
MD
2260 auio.uio_iov = &aiov;
2261 auio.uio_iovcnt = 1;
2262 auio.uio_offset = 0;
2263 auio.uio_rw = UIO_READ;
2264 auio.uio_segflg = UIO_USERSPACE;
dadab5e9 2265 auio.uio_td = td;
9697c509 2266 auio.uio_resid = count;
984263bc
MD
2267 error = VOP_READLINK(vp, &auio, p->p_ucred);
2268 }
2269 vput(vp);
9697c509
DRJ
2270 *res = count - auio.uio_resid;
2271 return (error);
2272}
2273
2274/*
2275 * readlink_args(char *path, char *buf, int count)
2276 *
2277 * Return target name of a symbolic link.
2278 */
2279int
753fd850 2280sys_readlink(struct readlink_args *uap)
9697c509 2281{
fad57d0e 2282 struct nlookupdata nd;
9697c509
DRJ
2283 int error;
2284
fad57d0e
MD
2285 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0);
2286 if (error == 0) {
2287 error = kern_readlink(&nd, uap->buf, uap->count,
2288 &uap->sysmsg_result);
2289 }
2290 nlookup_done(&nd);
984263bc
MD
2291 return (error);
2292}
2293
2294static int
41c20dac 2295setfflags(struct vnode *vp, int flags)
984263bc 2296{
dadab5e9
MD
2297 struct thread *td = curthread;
2298 struct proc *p = td->td_proc;
984263bc
MD
2299 int error;
2300 struct vattr vattr;
2301
2302 /*
2303 * Prevent non-root users from setting flags on devices. When
2304 * a device is reused, users can retain ownership of the device
2305 * if they are allowed to set flags and programs assume that
2306 * chown can't fail when done as root.
2307 */
2308 if ((vp->v_type == VCHR || vp->v_type == VBLK) &&
dadab5e9 2309 ((error = suser_cred(p->p_ucred, PRISON_ROOT)) != 0))
984263bc
MD
2310 return (error);
2311
186fccd6
MD
2312 /*
2313 * note: vget is required for any operation that might mod the vnode
2314 * so VINACTIVE is properly cleared.
2315 */
87de5057 2316 if ((error = vget(vp, LK_EXCLUSIVE)) == 0) {
186fccd6
MD
2317 VATTR_NULL(&vattr);
2318 vattr.va_flags = flags;
87de5057 2319 error = VOP_SETATTR(vp, &vattr, p->p_ucred);
186fccd6
MD
2320 vput(vp);
2321 }
984263bc
MD
2322 return (error);
2323}
2324
2325/*
41c20dac
MD
2326 * chflags(char *path, int flags)
2327 *
984263bc
MD
2328 * Change flags of a file given a path name.
2329 */
984263bc
MD
2330/* ARGSUSED */
2331int
753fd850 2332sys_chflags(struct chflags_args *uap)
984263bc 2333{
fad57d0e
MD
2334 struct nlookupdata nd;
2335 struct vnode *vp;
984263bc 2336 int error;
984263bc 2337
fad57d0e 2338 vp = NULL;
ab2eb4eb 2339 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
fad57d0e
MD
2340 /* XXX Add NLC flag indicating modifying operation? */
2341 if (error == 0)
2342 error = nlookup(&nd);
72310cfb 2343 if (error == 0)
28623bf9 2344 error = ncp_writechk(&nd.nl_nch);
fad57d0e 2345 if (error == 0)
28623bf9 2346 error = cache_vref(&nd.nl_nch, nd.nl_cred, &vp);
fad57d0e
MD
2347 nlookup_done(&nd);
2348 if (error == 0) {
ab2eb4eb 2349 error = setfflags(vp, uap->flags);
fad57d0e
MD
2350 vrele(vp);
2351 }
2352 return (error);
984263bc
MD
2353}
2354
2355/*
41c20dac
MD
2356 * fchflags_args(int fd, int flags)
2357 *
984263bc
MD
2358 * Change flags of a file given a file descriptor.
2359 */
984263bc
MD
2360/* ARGSUSED */
2361int
753fd850 2362sys_fchflags(struct fchflags_args *uap)
984263bc 2363{
dadab5e9
MD
2364 struct thread *td = curthread;
2365 struct proc *p = td->td_proc;
984263bc
MD
2366 struct file *fp;
2367 int error;
2368
5b287bba 2369 if ((error = holdvnode(p->p_fd, uap->fd, &fp)) != 0)
984263bc 2370 return (error);
28623bf9
MD
2371 if (fp->f_nchandle.ncp)
2372 error = ncp_writechk(&fp->f_nchandle);
72310cfb
MD
2373 if (error == 0)
2374 error = setfflags((struct vnode *) fp->f_data, uap->flags);
5b287bba
MD
2375 fdrop(fp);
2376 return (error);
984263bc
MD
2377}
2378
2379static int
41c20dac 2380setfmode(struct vnode *vp, int mode)
984263bc 2381{
dadab5e9
MD
2382 struct thread *td = curthread;
2383 struct proc *p = td->td_proc;
984263bc
MD
2384 int error;
2385 struct vattr vattr;
2386
186fccd6
MD
2387 /*
2388 * note: vget is required for any operation that might mod the vnode
2389 * so VINACTIVE is properly cleared.
2390 */
87de5057 2391 if ((error = vget(vp, LK_EXCLUSIVE)) == 0) {
186fccd6
MD
2392 VATTR_NULL(&vattr);
2393 vattr.va_mode = mode & ALLPERMS;
87de5057 2394 error = VOP_SETATTR(vp, &vattr, p->p_ucred);
186fccd6
MD
2395 vput(vp);
2396 }
984263bc
MD
2397 return error;
2398}
2399
9697c509 2400int
fad57d0e 2401kern_chmod(struct nlookupdata *nd, int mode)
9697c509 2402{
fad57d0e 2403 struct vnode *vp;
9697c509
DRJ
2404 int error;
2405
fad57d0e
MD
2406 /* XXX Add NLC flag indicating modifying operation? */
2407 if ((error = nlookup(nd)) != 0)
9697c509 2408 return (error);
28623bf9 2409 if ((error = cache_vref(&nd->nl_nch, nd->nl_cred, &vp)) != 0)
fad57d0e 2410 return (error);
28623bf9 2411 if ((error = ncp_writechk(&nd->nl_nch)) == 0)
72310cfb 2412 error = setfmode(vp, mode);
fad57d0e
MD
2413 vrele(vp);
2414 return (error);
9697c509
DRJ
2415}
2416
984263bc 2417/*
41c20dac
MD
2418 * chmod_args(char *path, int mode)
2419 *
984263bc
MD
2420 * Change mode of a file given path name.
2421 */
984263bc
MD
2422/* ARGSUSED */
2423int
753fd850 2424sys_chmod(struct chmod_args *uap)
984263bc 2425{
fad57d0e 2426 struct nlookupdata nd;
9697c509 2427 int error;
984263bc 2428
fad57d0e
MD
2429 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
2430 if (error == 0)
2431 error = kern_chmod(&nd, uap->mode);
2432 nlookup_done(&nd);
9697c509 2433 return (error);
984263bc
MD
2434}
2435
2436/*
41c20dac
MD
2437 * lchmod_args(char *path, int mode)
2438 *
984263bc
MD
2439 * Change mode of a file given path name (don't follow links.)
2440 */
984263bc
MD
2441/* ARGSUSED */
2442int
753fd850 2443sys_lchmod(struct lchmod_args *uap)
984263bc 2444{
fad57d0e 2445 struct nlookupdata nd;
984263bc 2446 int error;
984263bc 2447
fad57d0e
MD
2448 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0);
2449 if (error == 0)
2450 error = kern_chmod(&nd, uap->mode);
2451 nlookup_done(&nd);
2452 return (error);
984263bc
MD
2453}
2454
2455/*
41c20dac
MD
2456 * fchmod_args(int fd, int mode)
2457 *
984263bc
MD
2458 * Change mode of a file given a file descriptor.
2459 */
984263bc
MD
2460/* ARGSUSED */
2461int
753fd850 2462sys_fchmod(struct fchmod_args *uap)
984263bc 2463{
dadab5e9
MD
2464 struct thread *td = curthread;
2465 struct proc *p = td->td_proc;
984263bc
MD
2466 struct file *fp;
2467 int error;
2468
5b287bba 2469 if ((error = holdvnode(p->p_fd, uap->fd, &fp)) != 0)
984263bc 2470 return (error);
28623bf9
MD
2471 if (fp->f_nchandle.ncp)
2472 error = ncp_writechk(&fp->f_nchandle);
72310cfb
MD
2473 if (error == 0)
2474 error = setfmode((struct vnode *)fp->f_data, uap->mode);
5b287bba
MD
2475 fdrop(fp);
2476 return (error);
984263bc
MD
2477}
2478
2479static int
41c20dac 2480setfown(struct vnode *vp, uid_t uid, gid_t gid)
984263bc 2481{
dadab5e9
MD
2482 struct thread *td = curthread;
2483 struct proc *p = td->td_proc;
984263bc
MD
2484 int error;
2485 struct vattr vattr;
2486
186fccd6
MD
2487 /*
2488 * note: vget is required for any operation that might mod the vnode
2489 * so VINACTIVE is properly cleared.
2490 */
87de5057 2491 if ((error = vget(vp, LK_EXCLUSIVE)) == 0) {
186fccd6
MD
2492 VATTR_NULL(&vattr);
2493 vattr.va_uid = uid;
2494 vattr.va_gid = gid;
87de5057 2495 error = VOP_SETATTR(vp, &vattr, p->p_ucred);
186fccd6
MD
2496 vput(vp);
2497 }
984263bc
MD
2498 return error;
2499}
2500
9697c509 2501int
fad57d0e 2502kern_chown(struct nlookupdata *nd, int uid, int gid)
9697c509 2503{
fad57d0e 2504 struct vnode *vp;
9697c509
DRJ
2505 int error;
2506
fad57d0e
MD
2507 /* XXX Add NLC flag indicating modifying operation? */
2508 if ((error = nlookup(nd)) != 0)
9697c509 2509 return (error);
28623bf9 2510 if ((error = cache_vref(&nd->nl_nch, nd->nl_cred, &vp)) != 0)
fad57d0e 2511 return (error);
28623bf9 2512 if ((error = ncp_writechk(&nd->nl_nch)) == 0)
72310cfb 2513 error = setfown(vp, uid, gid);
fad57d0e 2514 vrele(vp);
9697c509
DRJ
2515 return (error);
2516}
2517
984263bc 2518/*
41c20dac
MD
2519 * chown(char *path, int uid, int gid)
2520 *
984263bc
MD
2521 * Set ownership given a path name.
2522 */
984263bc 2523int
753fd850 2524sys_chown(struct chown_args *uap)
984263bc 2525{
fad57d0e 2526 struct nlookupdata nd;
9697c509
DRJ
2527 int error;
2528
fad57d0e
MD
2529 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
2530 if (error == 0)
2531 error = kern_chown(&nd, uap->uid, uap->gid);
2532 nlookup_done(&nd);
984263bc
MD
2533 return (error);
2534}
2535
2536/*
41c20dac
MD
2537 * lchown_args(char *path, int uid, int gid)
2538 *
984263bc
MD
2539 * Set ownership given a path name, do not cross symlinks.
2540 */
984263bc 2541int
753fd850 2542sys_lchown(struct lchown_args *uap)
984263bc 2543{
fad57d0e 2544 struct nlookupdata nd;
984263bc 2545 int error;
9697c509 2546
fad57d0e
MD
2547 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0);
2548 if (error == 0)
2549 error = kern_chown(&nd, uap->uid, uap->gid);
2550 nlookup_done(&nd);
984263bc
MD
2551 return (error);
2552}
2553
2554/*
41c20dac
MD
2555 * fchown_args(int fd, int uid, int gid)
2556 *
984263bc
MD
2557 * Set ownership given a file descriptor.
2558 */
984263bc
MD
2559/* ARGSUSED */
2560int
753fd850 2561sys_fchown(struct fchown_args *uap)
984263bc 2562{
dadab5e9
MD
2563 struct thread *td = curthread;
2564 struct proc *p = td->td_proc;
984263bc
MD
2565 struct file *fp;
2566 int error;
2567
5b287bba 2568 if ((error = holdvnode(p->p_fd, uap->fd, &fp)) != 0)
984263bc 2569 return (error);
28623bf9
MD
2570 if (fp->f_nchandle.ncp)
2571 error = ncp_writechk(&fp->f_nchandle);
72310cfb
MD
2572 if (error == 0)
2573 error = setfown((struct vnode *)fp->f_data, uap->uid, uap->gid);
5b287bba
MD
2574 fdrop(fp);
2575 return (error);
984263bc
MD
2576}
2577
2578static int
9697c509 2579getutimes(const struct timeval *tvp, struct timespec *tsp)
984263bc
MD
2580{
2581 struct timeval tv[2];
984263bc 2582
9697c509 2583 if (tvp == NULL) {
984263bc
MD
2584 microtime(&tv[0]);
2585 TIMEVAL_TO_TIMESPEC(&tv[0], &tsp[0]);
2586 tsp[1] = tsp[0];
2587 } else {
9697c509
DRJ
2588 TIMEVAL_TO_TIMESPEC(&tvp[0], &tsp[0]);
2589 TIMEVAL_TO_TIMESPEC(&tvp[1], &tsp[1]);
984263bc
MD
2590 }
2591 return 0;
2592}
2593
2594static int
41c20dac 2595setutimes(struct vnode *vp, const struct timespec *ts, int nullflag)
984263bc 2596{
dadab5e9
MD
2597 struct thread *td = curthread;
2598 struct proc *p = td->td_proc;
984263bc
MD
2599 int error;
2600 struct vattr vattr;
2601
186fccd6
MD
2602 /*
2603 * note: vget is required for any operation that might mod the vnode
2604 * so VINACTIVE is properly cleared.
2605 */
87de5057 2606 if ((error = vget(vp, LK_EXCLUSIVE)) == 0) {
186fccd6
MD
2607 VATTR_NULL(&vattr);
2608 vattr.va_atime = ts[0];
2609 vattr.va_mtime = ts[1];
2610 if (nullflag)
2611 vattr.va_vaflags |= VA_UTIMES_NULL;
87de5057 2612 error = VOP_SETATTR(vp, &vattr, p->p_ucred);
186fccd6
MD
2613 vput(vp);
2614 }
984263bc
MD
2615 return error;
2616}
2617
9697c509 2618int
fad57d0e 2619kern_utimes(struct nlookupdata *nd, struct timeval *tptr)
9697c509
DRJ
2620{
2621 struct timespec ts[2];
fad57d0e 2622 struct vnode *vp;
9697c509
DRJ
2623 int error;
2624
fad57d0e 2625 if ((error = getutimes(tptr, ts)) != 0)
9697c509 2626 return (error);
fad57d0e
MD
2627 /* XXX Add NLC flag indicating modifying operation? */
2628 if ((error = nlookup(nd)) != 0)
9697c509 2629 return (error);
28623bf9 2630 if ((error = ncp_writechk(&nd->nl_nch)) != 0)
72310cfb 2631 return (error);
28623bf9 2632 if ((error = cache_vref(&nd->nl_nch, nd->nl_cred, &vp)) != 0)
fad57d0e
MD
2633 return (error);
2634 error = setutimes(vp, ts, tptr == NULL);
2635 vrele(vp);
9697c509
DRJ
2636 return (error);
2637}
2638
984263bc 2639/*
41c20dac
MD
2640 * utimes_args(char *path, struct timeval *tptr)
2641 *
984263bc
MD
2642 * Set the access and modification times of a file.
2643 */
984263bc 2644int
753fd850 2645sys_utimes(struct utimes_args *uap)
984263bc 2646{
9697c509 2647 struct timeval tv[2];
fad57d0e 2648 struct nlookupdata nd;
9697c509
DRJ
2649 int error;
2650
2651 if (uap->tptr) {
2652 error = copyin(uap->tptr, tv, sizeof(tv));
2653 if (error)
2654 return (error);
2655 }
fad57d0e
MD
2656 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
2657 if (error == 0)
2658 error = kern_utimes(&nd, uap->tptr ? tv : NULL);
2659 nlookup_done(&nd);
984263bc
MD
2660 return (error);
2661}
2662
2663/*
41c20dac
MD
2664 * lutimes_args(char *path, struct timeval *tptr)
2665 *
984263bc
MD
2666 * Set the access and modification times of a file.
2667 */
984263bc 2668int
753fd850 2669sys_lutimes(struct lutimes_args *uap)
984263bc 2670{
9697c509 2671 struct timeval tv[2];
fad57d0e 2672 struct nlookupdata nd;
9697c509
DRJ
2673 int error;
2674
2675 if (uap->tptr) {
2676 error = copyin(uap->tptr, tv, sizeof(tv));
2677 if (error)
2678 return (error);
2679 }
fad57d0e
MD
2680 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0);
2681 if (error == 0)
2682 error = kern_utimes(&nd, uap->tptr ? tv : NULL);
2683 nlookup_done(&nd);
984263bc
MD
2684 return (error);
2685}
2686
984263bc 2687int
9697c509 2688kern_futimes(int fd, struct timeval *tptr)
984263bc 2689{
dadab5e9
MD
2690 struct thread *td = curthread;
2691 struct proc *p = td->td_proc;
984263bc
MD
2692 struct timespec ts[2];
2693 struct file *fp;
984263bc
MD
2694 int error;
2695
9697c509
DRJ
2696 error = getutimes(tptr, ts);
2697 if (error)
984263bc 2698 return (error);
5b287bba 2699 if ((error = holdvnode(p->p_fd, fd, &fp)) != 0)
984263bc 2700 return (error);
28623bf9
MD
2701 if (fp->f_nchandle.ncp)
2702 error = ncp_writechk(&fp->f_nchandle);
72310cfb
MD
2703 if (error == 0)
2704 error = setutimes((struct vnode *)fp->f_data, ts, tptr == NULL);
5b287bba 2705 fdrop(fp);
9697c509 2706 return (error);
984263bc
MD
2707}
2708
2709/*
9697c509 2710 * futimes_args(int fd, struct timeval *tptr)
41c20dac 2711 *
9697c509 2712 * Set the access and modification times of a file.
984263bc 2713 */
984263bc 2714int
753fd850 2715sys_futimes(struct futimes_args *uap)
9697c509
DRJ
2716{
2717 struct timeval tv[2];
2718 int error;
2719
2720 if (uap->tptr) {
2721 error = copyin(uap->tptr, tv, sizeof(tv));
2722 if (error)
2723 return (error);
2724 }
2725
b651c485 2726 error = kern_futimes(uap->fd, uap->tptr ? tv : NULL);
9697c509
DRJ
2727
2728 return (error);
2729}
2730
2731int
fad57d0e 2732kern_truncate(struct nlookupdata *nd, off_t length)
984263bc 2733{
41c20dac 2734 struct vnode *vp;
984263bc
MD
2735 struct vattr vattr;
2736 int error;
984263bc 2737
9697c509 2738 if (length < 0)
984263bc 2739 return(EINVAL);
fad57d0e
MD
2740 /* XXX Add NLC flag indicating modifying operation? */
2741 if ((error = nlookup(nd)) != 0)
984263bc 2742 return (error);
28623bf9 2743 if ((error = ncp_writechk(&nd->nl_nch)) != 0)
72310cfb 2744 return (error);
28623bf9 2745 if ((error = cache_vref(&nd->nl_nch, nd->nl_cred, &vp)) != 0)
fad57d0e 2746 return (error);
ca466bae 2747 if ((error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY)) != 0) {
fad57d0e
MD
2748 vrele(vp);
2749 return (error);
2750 }
2751 if (vp->v_type == VDIR) {
984263bc 2752 error = EISDIR;
28623bf9 2753 } else if ((error = vn_writechk(vp, &nd->nl_nch)) == 0 &&
87de5057 2754 (error = VOP_ACCESS(vp, VWRITE, nd->nl_cred)) == 0) {
984263bc 2755 VATTR_NULL(&vattr);
9697c509 2756 vattr.va_size = length;
87de5057 2757 error = VOP_SETATTR(vp, &vattr, nd->nl_cred);
984263bc
MD
2758 }
2759 vput(vp);
2760 return (error);
2761}
2762
9697c509
DRJ
2763/*
2764 * truncate(char *path, int pad, off_t length)
2765 *
2766 * Truncate a file given its path name.
2767 */
2768int
753fd850 2769sys_truncate(struct truncate_args *uap)
9697c509 2770{
fad57d0e 2771 struct nlookupdata nd;
9697c509
DRJ
2772 int error;
2773
fad57d0e
MD
2774 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
2775 if (error == 0)
2776 error = kern_truncate(&nd, uap->length);
2777 nlookup_done(&nd);
9697c509
DRJ
2778 return error;
2779}
2780
984263bc 2781int
8f6f8622 2782kern_ftruncate(int fd, off_t length)
984263bc 2783{
dadab5e9
MD
2784 struct thread *td = curthread;
2785 struct proc *p = td->td_proc;
984263bc
MD
2786 struct vattr vattr;
2787 struct vnode *vp;
2788 struct file *fp;
2789 int error;
2790
8f6f8622 2791 if (length < 0)
984263bc 2792 return(EINVAL);
5b287bba 2793 if ((error = holdvnode(p->p_fd, fd, &fp)) != 0)
984263bc 2794 return (error);
28623bf9
MD
2795 if (fp->f_nchandle.ncp) {
2796 error = ncp_writechk(&fp->f_nchandle);
72310cfb
MD
2797 if (error)
2798 goto done;
2799 }
5b287bba
MD
2800 if ((fp->f_flag & FWRITE) == 0) {
2801 error = EINVAL;
2802 goto done;
2803 }
984263bc 2804 vp = (struct vnode *)fp->f_data;
ca466bae 2805 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
5b287bba 2806 if (vp->v_type == VDIR) {
984263bc 2807 error = EISDIR;
468bb1f9 2808 } else if ((error = vn_writechk(vp, NULL)) == 0) {
984263bc 2809 VATTR_NULL(&vattr);
8f6f8622 2810 vattr.va_size = length;
87de5057 2811 error = VOP_SETATTR(vp, &vattr, fp->f_cred);
984263bc 2812 }
a11aaa81 2813 vn_unlock(vp);
5b287bba
MD
2814done:
2815 fdrop(fp);
984263bc
MD
2816 return (error);
2817}
2818
984263bc 2819/*
8f6f8622 2820 * ftruncate_args(int fd, int pad, off_t length)
41c20dac 2821 *
8f6f8622 2822 * Truncate a file given a file descriptor.
984263bc 2823 */
984263bc 2824int
753fd850 2825sys_ftruncate(struct ftruncate_args *uap)
984263bc 2826{
8f6f8622 2827 int error;
984263bc 2828
8f6f8622
DRJ
2829 error = kern_ftruncate(uap->fd, uap->length);
2830
2831 return (error);
984263bc
MD
2832}
2833
984263bc 2834/*
41c20dac
MD
2835 * fsync(int fd)
2836 *
984263bc
MD
2837 * Sync an open file.
2838 */
984263bc
MD
2839/* ARGSUSED */
2840int
753fd850 2841sys_fsync(struct fsync_args *uap)
984263bc 2842{
dadab5e9
MD
2843 struct thread *td = curthread;
2844 struct proc *p = td->td_proc;
41c20dac 2845 struct vnode *vp;
984263bc
MD
2846 struct file *fp;
2847 vm_object_t obj;
2848 int error;
2849
5b287bba 2850 if ((error = holdvnode(p->p_fd, uap->fd, &fp)) != 0)
984263bc
MD
2851 return (error);
2852 vp = (struct vnode *)fp->f_data;
ca466bae 2853 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
7540ab49 2854 if ((obj = vp->v_object) != NULL)
984263bc 2855 vm_object_page_clean(obj, 0, 0, 0);
408357d8
MD
2856 if ((error = VOP_FSYNC(vp, MNT_WAIT)) == 0 && vp->v_mount)
2857 error = buf_fsync(vp);
a11aaa81 2858 vn_unlock(vp);
5b287bba 2859 fdrop(fp);
984263bc
MD
2860 return (error);
2861}
2862
984263bc 2863int
fad57d0e 2864kern_rename(struct nlookupdata *fromnd, struct nlookupdata *tond)
984263bc 2865{
28623bf9
MD
2866 struct nchandle fnchd;
2867 struct nchandle tnchd;
fad57d0e 2868 struct namecache *ncp;
dff430ab
MD
2869 struct vnode *fdvp;
2870 struct vnode *tdvp;
fad57d0e 2871 struct mount *mp;
984263bc
MD
2872 int error;
2873
2874 bwillwrite();
5312fa43 2875 fromnd->nl_flags |= NLC_REFDVP;
fad57d0e 2876 if ((error = nlookup(fromnd)) != 0)
984263bc 2877 return (error);
28623bf9 2878 if ((fnchd.ncp = fromnd->nl_nch.ncp->nc_parent) == NULL)
fad57d0e 2879 return (ENOENT);
28623bf9
MD
2880 fnchd.mount = fromnd->nl_nch.mount;
2881 cache_hold(&fnchd);
fad57d0e
MD
2882
2883 /*
28623bf9 2884 * unlock the source nch so we can lookup the target nch without
fad57d0e
MD
2885 * deadlocking. The target may or may not exist so we do not check
2886 * for a target vp like kern_mkdir() and other creation functions do.
2887 *
2888 * The source and target directories are ref'd and rechecked after
2889 * everything is relocked to determine if the source or target file
2890 * has been renamed.
2891 */
2892 KKASSERT(fromnd->nl_flags & NLC_NCPISLOCKED);
2893 fromnd->nl_flags &= ~NLC_NCPISLOCKED;
28623bf9 2894 cache_unlock(&fromnd->nl_nch);
fad57d0e 2895
5312fa43 2896 tond->nl_flags |= NLC_CREATE | NLC_REFDVP;
fad57d0e 2897 if ((error = nlookup(tond)) != 0) {
28623bf9 2898 cache_drop(&fnchd);
fad57d0e
MD
2899 return (error);
2900 }
28623bf9
MD
2901 if ((tnchd.ncp = tond->nl_nch.ncp->nc_parent) == NULL) {
2902 cache_drop(&fnchd);
fad57d0e
MD
2903 return (ENOENT);
2904 }
28623bf9
MD
2905 tnchd.mount = tond->nl_nch.mount;
2906 cache_hold(&tnchd);
fad57d0e
MD
2907
2908 /*
2909 * If the source and target are the same there is nothing to do
2910 */
28623bf9
MD
2911 if (fromnd->nl_nch.ncp == tond->nl_nch.ncp) {
2912 cache_drop(&fnchd);
2913 cache_drop(&tnchd);
fad57d0e
MD
2914 return (0);
2915 }
2916
1d505369
MD
2917 /*
2918 * Mount points cannot be renamed or overwritten
2919 */
28623bf9
MD
2920 if ((fromnd->nl_nch.ncp->nc_flag | tond->nl_nch.ncp->nc_flag) &
2921 NCF_ISMOUNTPT
1d505369 2922 ) {
28623bf9
MD
2923 cache_drop(&fnchd);
2924 cache_drop(&tnchd);
1d505369
MD
2925 return (EINVAL);
2926 }
2927
fad57d0e 2928 /*
aa40af33
MD
2929 * relock the source ncp. NOTE AFTER RELOCKING: the source ncp
2930 * may have become invalid while it was unlocked, nc_vp and nc_mount
2931 * could be NULL.
fad57d0e 2932 */
28623bf9
MD
2933 if (cache_lock_nonblock(&fromnd->nl_nch) == 0) {
2934 cache_resolve(&fromnd->nl_nch, fromnd->nl_cred);
2935 } else if (fromnd->nl_nch.ncp > tond->nl_nch.ncp) {
2936 cache_lock(&fromnd->nl_nch);
2937 cache_resolve(&fromnd->nl_nch, fromnd->nl_cred);
fad57d0e 2938 } else {
28623bf9
MD
2939 cache_unlock(&tond->nl_nch);
2940 cache_lock(&fromnd->nl_nch);
2941 cache_resolve(&fromnd->nl_nch, fromnd->nl_cred);
2942 cache_lock(&tond->nl_nch);
2943 cache_resolve(&tond->nl_nch, tond->nl_cred);
fad57d0e
MD
2944 }
2945 fromnd->nl_flags |= NLC_NCPISLOCKED;
2946
2947 /*
2948 * make sure the parent directories linkages are the same
2949 */
28623bf9
MD
2950 if (fnchd.ncp != fromnd->nl_nch.ncp->nc_parent ||
2951 tnchd.ncp != tond->nl_nch.ncp->nc_parent) {
2952 cache_drop(&fnchd);
2953 cache_drop(&tnchd);
fad57d0e
MD
2954 return (ENOENT);
2955 }
2956
2957 /*
2958 * Both the source and target must be within the same filesystem and
2959 * in the same filesystem as their parent directories within the
2960 * namecache topology.
aa40af33
MD
2961 *
2962 * NOTE: fromnd's nc_mount or nc_vp could be NULL.
fad57d0e 2963 */
28623bf9
MD
2964 mp = fnchd.mount;
2965 if (mp != tnchd.mount || mp != fromnd->nl_nch.mount ||
2966 mp != tond->nl_nch.mount) {
2967 cache_drop(&fnchd);
2968 cache_drop(&tnchd);
fad57d0e
MD
2969 return (EXDEV);
2970 }
2971
72310cfb
MD
2972 /*
2973 * Make sure the mount point is writable
2974 */
28623bf9
MD
2975 if ((error = ncp_writechk(&tond->nl_nch)) != 0) {
2976 cache_drop(&fnchd);
2977 cache_drop(&tnchd);
72310cfb
MD
2978 return (error);
2979 }
2980
fad57d0e
MD
2981 /*
2982 * If the target exists and either the source or target is a directory,
2983 * then both must be directories.
aa40af33 2984 *
28623bf9
MD
2985 * Due to relocking of the source, fromnd->nl_nch.ncp->nc_vp might h
2986 * have become NULL.
fad57d0e 2987 */
28623bf9
MD
2988 if (tond->nl_nch.ncp->nc_vp) {
2989 if (fromnd->nl_nch.ncp->nc_vp == NULL) {
aa40af33 2990 error = ENOENT;
28623bf9
MD
2991 } else if (fromnd->nl_nch.ncp->nc_vp->v_type == VDIR) {
2992 if (tond->nl_nch.ncp->nc_vp->v_type != VDIR)
fad57d0e 2993 error = ENOTDIR;
28623bf9 2994 } else if (tond->nl_nch.ncp->nc_vp->v_type == VDIR) {
984263bc 2995 error = EISDIR;
984263bc
MD
2996 }
2997 }
fad57d0e 2998
984263bc 2999 /*
fad57d0e
MD
3000 * You cannot rename a source into itself or a subdirectory of itself.
3001 * We check this by travsersing the target directory upwards looking
3002 * for a match against the source.
984263bc 3003 */
fad57d0e 3004 if (error == 0) {
28623bf9
MD
3005 for (ncp = tnchd.ncp; ncp; ncp = ncp->nc_parent) {
3006 if (fromnd->nl_nch.ncp == ncp) {
fad57d0e
MD
3007 error = EINVAL;
3008 break;
3009 }
984263bc 3010 }
fad57d0e
MD
3011 }
3012
28623bf9
MD
3013 cache_drop(&fnchd);
3014 cache_drop(&tnchd);
bc8fd9e0
MD
3015
3016 /*
3017 * Even though the namespaces are different, they may still represent
3018 * hardlinks to the same file. The filesystem might have a hard time
3019 * with this so we issue a NREMOVE of the source instead of a NRENAME
3020 * when we detect the situation.
3021 */
3022 if (error == 0) {
5312fa43
MD
3023 fdvp = fromnd->nl_dvp;
3024 tdvp = tond->nl_dvp;
dff430ab
MD
3025 if (fdvp == NULL || tdvp == NULL) {
3026 error = EPERM;
3027 } else if (fromnd->nl_nch.ncp->nc_vp == tond->nl_nch.ncp->nc_vp) {
dff430ab
MD
3028 error = VOP_NREMOVE(&fromnd->nl_nch, fdvp,
3029 fromnd->nl_cred);
bc8fd9e0 3030 } else {
28623bf9 3031 error = VOP_NRENAME(&fromnd->nl_nch, &tond->nl_nch,
dff430ab 3032 fdvp, tdvp, tond->nl_cred);
bc8fd9e0
MD
3033 }
3034 }
984263bc
MD
3035 return (error);
3036}
3037
3038/*
9697c509 3039 * rename_args(char *from, char *to)
41c20dac 3040 *
9697c509
DRJ
3041 * Rename files. Source and destination must either both be directories,
3042 * or both not be directories. If target is a directory, it must be empty.
984263bc 3043 */
984263bc 3044int
753fd850 3045sys_rename(struct rename_args *uap)
9697c509 3046{
fad57d0e 3047 struct nlookupdata fromnd, tond;
9697c509
DRJ
3048 int error;
3049
fad57d0e
MD
3050 error = nlookup_init(&fromnd, uap->from, UIO_USERSPACE, 0);
3051 if (error == 0) {
3052 error = nlookup_init(&tond, uap->to, UIO_USERSPACE, 0);
3053 if (error == 0)
3054 error = kern_rename(&fromnd, &tond);
3055 nlookup_done(&tond);
3056 }
3057 nlookup_done(&fromnd);
9697c509
DRJ
3058 return (error);
3059}
3060
3061int
fad57d0e 3062kern_mkdir(struct nlookupdata *nd, int mode)
984263bc 3063{
dadab5e9
MD
3064 struct thread *td = curthread;
3065 struct proc *p = td->td_proc;
41c20dac 3066 struct vnode *vp;
984263bc
MD
3067 struct vattr vattr;
3068 int error;
984263bc
MD
3069
3070 bwillwrite();
5312fa43 3071 nd->nl_flags |= NLC_WILLBEDIR | NLC_CREATE | NLC_REFDVP;
fad57d0e 3072 if ((error = nlookup(nd)) != 0)
984263bc 3073 return (error);
fad57d0e 3074
28623bf9 3075 if (nd->nl_nch.ncp->nc_vp)
984263bc 3076 return (EEXIST);
28623bf9 3077 if ((error = ncp_writechk(&nd->nl_nch)) != 0)
72310cfb 3078 return (error);
984263bc
MD
3079 VATTR_NULL(&vattr);
3080 vattr.va_type = VDIR;
9697c509 3081 vattr.va_mode = (mode & ACCESSPERMS) &~ p->p_fd->fd_cmask;
fad57d0e
MD
3082
3083 vp = NULL;
5312fa43 3084 error = VOP_NMKDIR(&nd->nl_nch, nd->nl_dvp, &vp, p->p_ucred, &vattr);
9697c509 3085 if (error == 0)
fad57d0e 3086 vput(vp);
984263bc
MD
3087 return (error);
3088}
3089
3090/*
9697c509 3091 * mkdir_args(char *path, int mode)
41c20dac 3092 *
9697c509 3093 * Make a directory file.
984263bc 3094 */
984263bc
MD
3095/* ARGSUSED */
3096int
753fd850 3097sys_mkdir(struct mkdir_args *uap)
9697c509 3098{
fad57d0e 3099 struct nlookupdata nd;
9697c509
DRJ
3100 int error;
3101
fad57d0e
MD
3102 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0);
3103 if (error == 0)
3104 error = kern_mkdir(&nd, uap->mode);
3105 nlookup_done(&nd);
9697c509
DRJ
3106 return (error);
3107}
3108
3109int
fad57d0e 3110kern_rmdir(struct nlookupdata *nd)
984263bc 3111{
984263bc 3112 int error;
984263bc
MD
3113
3114 bwillwrite();
5312fa43 3115 nd->nl_flags |= NLC_DELETE | NLC_REFDVP;
fad57d0e 3116 if ((error = nlookup(nd)) != 0)
984263bc 3117 return (error);
1d505369
MD
3118
3119 /*
3120 * Do not allow directories representing mount points to be
3121 * deleted, even if empty. Check write perms on mount point
3122 * in case the vnode is aliased (aka nullfs).
3123 */
28623bf9 3124 if (nd->nl_nch.ncp->nc_flag & (NCF_ISMOUNTPT))
1d505369 3125 return (EINVAL);
28623bf9 3126 if ((error = ncp_writechk(&nd->nl_nch)) != 0)
72310cfb 3127 return (error);
5312fa43 3128 error = VOP_NRMDIR(&nd->nl_nch, nd->nl_dvp, nd->nl_cred);
984263bc
MD
3129 return (error);
3130}
3131
984263bc 3132/*
9697c509 3133 * rmdir_args(char *path)
41c20dac 3134 *
9697c509 3135 * Remove a directory file.
984263bc 3136 */
9697c509 3137/* ARGSUSED */
984263bc 3138int
753fd850 3139sys_rmdir(struct rmdir_args *uap)
984263bc 3140{
fad57d0e 3141 struct nlookupdata nd;
9697c509
DRJ
3142 int error;
3143
fad57d0e
MD
3144 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0);
3145 if (error == 0)
3146 error = kern_rmdir(&nd);
3147 nlookup_done(&nd);
984263bc
MD
3148 return (error);
3149}
984263bc 3150
984263bc 3151int
53b02c48
JS
3152kern_getdirentries(int fd, char *buf, u_int count, long *basep, int *res,
3153 enum uio_seg direction)
984263bc 3154{
dadab5e9
MD
3155 struct thread *td = curthread;
3156 struct proc *p = td->td_proc;
984263bc
MD
3157 struct vnode *vp;
3158 struct file *fp;