1 /*-
2 * Copyright (c) 1982, 1986, 1989, 1993, 1995
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 * 4. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * @(#)ufs_vnops.c 8.27 (Berkeley) 5/27/95
35 */
36
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD: releng/11.1/sys/ufs/ufs/ufs_vnops.c 312072 2017-01-13 13:37:09Z kib $");
39
40 #include "opt_quota.h"
41 #include "opt_suiddir.h"
42 #include "opt_ufs.h"
43 #include "opt_ffs.h"
44
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/malloc.h>
48 #include <sys/namei.h>
49 #include <sys/kernel.h>
50 #include <sys/fcntl.h>
51 #include <sys/filio.h>
52 #include <sys/stat.h>
53 #include <sys/bio.h>
54 #include <sys/buf.h>
55 #include <sys/mount.h>
56 #include <sys/priv.h>
57 #include <sys/refcount.h>
58 #include <sys/unistd.h>
59 #include <sys/vnode.h>
60 #include <sys/dirent.h>
61 #include <sys/lockf.h>
62 #include <sys/conf.h>
63 #include <sys/acl.h>
64
65 #include <security/mac/mac_framework.h>
66
67 #include <sys/file.h> /* XXX */
68
69 #include <vm/vm.h>
70 #include <vm/vm_extern.h>
71
72 #include <ufs/ufs/acl.h>
73 #include <ufs/ufs/extattr.h>
74 #include <ufs/ufs/quota.h>
75 #include <ufs/ufs/inode.h>
76 #include <ufs/ufs/dir.h>
77 #include <ufs/ufs/ufsmount.h>
78 #include <ufs/ufs/ufs_extern.h>
79 #ifdef UFS_DIRHASH
80 #include <ufs/ufs/dirhash.h>
81 #endif
82 #ifdef UFS_GJOURNAL
83 #include <ufs/ufs/gjournal.h>
84 FEATURE(ufs_gjournal, "Journaling support through GEOM for UFS");
85 #endif
86
87 #ifdef QUOTA
88 FEATURE(ufs_quota, "UFS disk quotas support");
89 FEATURE(ufs_quota64, "64bit UFS disk quotas support");
90 #endif
91
92 #ifdef SUIDDIR
93 FEATURE(suiddir,
94 "Give all new files in directory the same ownership as the directory");
95 #endif
96
97
98 #include <ufs/ffs/ffs_extern.h>
99
100 static vop_accessx_t ufs_accessx;
101 static int ufs_chmod(struct vnode *, int, struct ucred *, struct thread *);
102 static int ufs_chown(struct vnode *, uid_t, gid_t, struct ucred *, struct thread *);
103 static vop_close_t ufs_close;
104 static vop_create_t ufs_create;
105 static vop_getattr_t ufs_getattr;
106 static vop_ioctl_t ufs_ioctl;
107 static vop_link_t ufs_link;
108 static int ufs_makeinode(int mode, struct vnode *, struct vnode **, struct componentname *, const char *);
109 static vop_markatime_t ufs_markatime;
110 static vop_mkdir_t ufs_mkdir;
111 static vop_mknod_t ufs_mknod;
112 static vop_open_t ufs_open;
113 static vop_pathconf_t ufs_pathconf;
114 static vop_print_t ufs_print;
115 static vop_readlink_t ufs_readlink;
116 static vop_remove_t ufs_remove;
117 static vop_rename_t ufs_rename;
118 static vop_rmdir_t ufs_rmdir;
119 static vop_setattr_t ufs_setattr;
120 static vop_strategy_t ufs_strategy;
121 static vop_symlink_t ufs_symlink;
122 static vop_whiteout_t ufs_whiteout;
123 static vop_close_t ufsfifo_close;
124 static vop_kqfilter_t ufsfifo_kqfilter;
125 static vop_pathconf_t ufsfifo_pathconf;
126
127 SYSCTL_NODE(_vfs, OID_AUTO, ufs, CTLFLAG_RD, 0, "UFS filesystem");
128
129 /*
130 * A virgin directory (no blushing please).
131 */
132 static struct dirtemplate mastertemplate = {
133 0, 12, DT_DIR, 1, ".",
134 0, DIRBLKSIZ - 12, DT_DIR, 2, ".."
135 };
136 static struct odirtemplate omastertemplate = {
137 0, 12, 1, ".",
138 0, DIRBLKSIZ - 12, 2, ".."
139 };
140
141 static void
142 ufs_itimes_locked(struct vnode *vp)
143 {
144 struct inode *ip;
145 struct timespec ts;
146
147 ASSERT_VI_LOCKED(vp, __func__);
148
149 ip = VTOI(vp);
150 if (UFS_RDONLY(ip))
151 goto out;
152 if ((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE)) == 0)
153 return;
154
155 if ((vp->v_type == VBLK || vp->v_type == VCHR) && !DOINGSOFTDEP(vp))
156 ip->i_flag |= IN_LAZYMOD;
157 else if (((vp->v_mount->mnt_kern_flag &
158 (MNTK_SUSPENDED | MNTK_SUSPEND)) == 0) ||
159 (ip->i_flag & (IN_CHANGE | IN_UPDATE)))
160 ip->i_flag |= IN_MODIFIED;
161 else if (ip->i_flag & IN_ACCESS)
162 ip->i_flag |= IN_LAZYACCESS;
163 vfs_timestamp(&ts);
164 if (ip->i_flag & IN_ACCESS) {
165 DIP_SET(ip, i_atime, ts.tv_sec);
166 DIP_SET(ip, i_atimensec, ts.tv_nsec);
167 }
168 if (ip->i_flag & IN_UPDATE) {
169 DIP_SET(ip, i_mtime, ts.tv_sec);
170 DIP_SET(ip, i_mtimensec, ts.tv_nsec);
171 }
172 if (ip->i_flag & IN_CHANGE) {
173 DIP_SET(ip, i_ctime, ts.tv_sec);
174 DIP_SET(ip, i_ctimensec, ts.tv_nsec);
175 DIP_SET(ip, i_modrev, DIP(ip, i_modrev) + 1);
176 }
177
178 out:
179 ip->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE);
180 }
181
182 void
183 ufs_itimes(struct vnode *vp)
184 {
185
186 VI_LOCK(vp);
187 ufs_itimes_locked(vp);
188 VI_UNLOCK(vp);
189 }
190
191 /*
192 * Create a regular file
193 */
194 static int
195 ufs_create(ap)
196 struct vop_create_args /* {
197 struct vnode *a_dvp;
198 struct vnode **a_vpp;
199 struct componentname *a_cnp;
200 struct vattr *a_vap;
201 } */ *ap;
202 {
203 int error;
204
205 error =
206 ufs_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode),
207 ap->a_dvp, ap->a_vpp, ap->a_cnp, "ufs_create");
208 if (error != 0)
209 return (error);
210 if ((ap->a_cnp->cn_flags & MAKEENTRY) != 0)
211 cache_enter(ap->a_dvp, *ap->a_vpp, ap->a_cnp);
212 return (0);
213 }
214
215 /*
216 * Mknod vnode call
217 */
218 /* ARGSUSED */
219 static int
220 ufs_mknod(ap)
221 struct vop_mknod_args /* {
222 struct vnode *a_dvp;
223 struct vnode **a_vpp;
224 struct componentname *a_cnp;
225 struct vattr *a_vap;
226 } */ *ap;
227 {
228 struct vattr *vap = ap->a_vap;
229 struct vnode **vpp = ap->a_vpp;
230 struct inode *ip;
231 ino_t ino;
232 int error;
233
234 error = ufs_makeinode(MAKEIMODE(vap->va_type, vap->va_mode),
235 ap->a_dvp, vpp, ap->a_cnp, "ufs_mknod");
236 if (error)
237 return (error);
238 ip = VTOI(*vpp);
239 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
240 if (vap->va_rdev != VNOVAL) {
241 /*
242 * Want to be able to use this to make badblock
243 * inodes, so don't truncate the dev number.
244 */
245 DIP_SET(ip, i_rdev, vap->va_rdev);
246 }
247 /*
248 * Remove inode, then reload it through VFS_VGET so it is
249 * checked to see if it is an alias of an existing entry in
250 * the inode cache. XXX I don't believe this is necessary now.
251 */
252 (*vpp)->v_type = VNON;
253 ino = ip->i_number; /* Save this before vgone() invalidates ip. */
254 vgone(*vpp);
255 vput(*vpp);
256 error = VFS_VGET(ap->a_dvp->v_mount, ino, LK_EXCLUSIVE, vpp);
257 if (error) {
258 *vpp = NULL;
259 return (error);
260 }
261 return (0);
262 }
263
264 /*
265 * Open called.
266 */
267 /* ARGSUSED */
268 static int
269 ufs_open(struct vop_open_args *ap)
270 {
271 struct vnode *vp = ap->a_vp;
272 struct inode *ip;
273
274 if (vp->v_type == VCHR || vp->v_type == VBLK)
275 return (EOPNOTSUPP);
276
277 ip = VTOI(vp);
278 /*
279 * Files marked append-only must be opened for appending.
280 */
281 if ((ip->i_flags & APPEND) &&
282 (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE)
283 return (EPERM);
284 vnode_create_vobject(vp, DIP(ip, i_size), ap->a_td);
285 return (0);
286 }
287
288 /*
289 * Close called.
290 *
291 * Update the times on the inode.
292 */
293 /* ARGSUSED */
294 static int
295 ufs_close(ap)
296 struct vop_close_args /* {
297 struct vnode *a_vp;
298 int a_fflag;
299 struct ucred *a_cred;
300 struct thread *a_td;
301 } */ *ap;
302 {
303 struct vnode *vp = ap->a_vp;
304 int usecount;
305
306 VI_LOCK(vp);
307 usecount = vp->v_usecount;
308 if (usecount > 1)
309 ufs_itimes_locked(vp);
310 VI_UNLOCK(vp);
311 return (0);
312 }
313
314 static int
315 ufs_accessx(ap)
316 struct vop_accessx_args /* {
317 struct vnode *a_vp;
318 accmode_t a_accmode;
319 struct ucred *a_cred;
320 struct thread *a_td;
321 } */ *ap;
322 {
323 struct vnode *vp = ap->a_vp;
324 struct inode *ip = VTOI(vp);
325 accmode_t accmode = ap->a_accmode;
326 int error;
327 #ifdef QUOTA
328 int relocked;
329 #endif
330 #ifdef UFS_ACL
331 struct acl *acl;
332 acl_type_t type;
333 #endif
334
335 /*
336 * Disallow write attempts on read-only filesystems;
337 * unless the file is a socket, fifo, or a block or
338 * character device resident on the filesystem.
339 */
340 if (accmode & VMODIFY_PERMS) {
341 switch (vp->v_type) {
342 case VDIR:
343 case VLNK:
344 case VREG:
345 if (vp->v_mount->mnt_flag & MNT_RDONLY)
346 return (EROFS);
347 #ifdef QUOTA
348 /*
349 * Inode is accounted in the quotas only if struct
350 * dquot is attached to it. VOP_ACCESS() is called
351 * from vn_open_cred() and provides a convenient
352 * point to call getinoquota().
353 */
354 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) {
355
356 /*
357 * Upgrade vnode lock, since getinoquota()
358 * requires exclusive lock to modify inode.
359 */
360 relocked = 1;
361 vhold(vp);
362 vn_lock(vp, LK_UPGRADE | LK_RETRY);
363 VI_LOCK(vp);
364 if (vp->v_iflag & VI_DOOMED) {
365 vdropl(vp);
366 error = ENOENT;
367 goto relock;
368 }
369 vdropl(vp);
370 } else
371 relocked = 0;
372 error = getinoquota(ip);
373 relock:
374 if (relocked)
375 vn_lock(vp, LK_DOWNGRADE | LK_RETRY);
376 if (error != 0)
377 return (error);
378 #endif
379 break;
380 default:
381 break;
382 }
383 }
384
385 /*
386 * If immutable bit set, nobody gets to write it. "& ~VADMIN_PERMS"
387 * permits the owner of the file to remove the IMMUTABLE flag.
388 */
389 if ((accmode & (VMODIFY_PERMS & ~VADMIN_PERMS)) &&
390 (ip->i_flags & (IMMUTABLE | SF_SNAPSHOT)))
391 return (EPERM);
392
393 #ifdef UFS_ACL
394 if ((vp->v_mount->mnt_flag & (MNT_ACLS | MNT_NFS4ACLS)) != 0) {
395 if (vp->v_mount->mnt_flag & MNT_NFS4ACLS)
396 type = ACL_TYPE_NFS4;
397 else
398 type = ACL_TYPE_ACCESS;
399
400 acl = acl_alloc(M_WAITOK);
401 if (type == ACL_TYPE_NFS4)
402 error = ufs_getacl_nfs4_internal(vp, acl, ap->a_td);
403 else
404 error = VOP_GETACL(vp, type, acl, ap->a_cred, ap->a_td);
405 switch (error) {
406 case 0:
407 if (type == ACL_TYPE_NFS4) {
408 error = vaccess_acl_nfs4(vp->v_type, ip->i_uid,
409 ip->i_gid, acl, accmode, ap->a_cred, NULL);
410 } else {
411 error = vfs_unixify_accmode(&accmode);
412 if (error == 0)
413 error = vaccess_acl_posix1e(vp->v_type, ip->i_uid,
414 ip->i_gid, acl, accmode, ap->a_cred, NULL);
415 }
416 break;
417 default:
418 if (error != EOPNOTSUPP)
419 printf(
420 "ufs_accessx(): Error retrieving ACL on object (%d).\n",
421 error);
422 /*
423 * XXX: Fall back until debugged. Should
424 * eventually possibly log an error, and return
425 * EPERM for safety.
426 */
427 error = vfs_unixify_accmode(&accmode);
428 if (error == 0)
429 error = vaccess(vp->v_type, ip->i_mode, ip->i_uid,
430 ip->i_gid, accmode, ap->a_cred, NULL);
431 }
432 acl_free(acl);
433
434 return (error);
435 }
436 #endif /* !UFS_ACL */
437 error = vfs_unixify_accmode(&accmode);
438 if (error == 0)
439 error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, ip->i_gid,
440 accmode, ap->a_cred, NULL);
441 return (error);
442 }
443
444 /* ARGSUSED */
445 static int
446 ufs_getattr(ap)
447 struct vop_getattr_args /* {
448 struct vnode *a_vp;
449 struct vattr *a_vap;
450 struct ucred *a_cred;
451 } */ *ap;
452 {
453 struct vnode *vp = ap->a_vp;
454 struct inode *ip = VTOI(vp);
455 struct vattr *vap = ap->a_vap;
456
457 VI_LOCK(vp);
458 ufs_itimes_locked(vp);
459 if (I_IS_UFS1(ip)) {
460 vap->va_atime.tv_sec = ip->i_din1->di_atime;
461 vap->va_atime.tv_nsec = ip->i_din1->di_atimensec;
462 } else {
463 vap->va_atime.tv_sec = ip->i_din2->di_atime;
464 vap->va_atime.tv_nsec = ip->i_din2->di_atimensec;
465 }
466 VI_UNLOCK(vp);
467 /*
468 * Copy from inode table
469 */
470 vap->va_fsid = dev2udev(ITOUMP(ip)->um_dev);
471 vap->va_fileid = ip->i_number;
472 vap->va_mode = ip->i_mode & ~IFMT;
473 vap->va_nlink = ip->i_effnlink;
474 vap->va_uid = ip->i_uid;
475 vap->va_gid = ip->i_gid;
476 if (I_IS_UFS1(ip)) {
477 vap->va_rdev = ip->i_din1->di_rdev;
478 vap->va_size = ip->i_din1->di_size;
479 vap->va_mtime.tv_sec = ip->i_din1->di_mtime;
480 vap->va_mtime.tv_nsec = ip->i_din1->di_mtimensec;
481 vap->va_ctime.tv_sec = ip->i_din1->di_ctime;
482 vap->va_ctime.tv_nsec = ip->i_din1->di_ctimensec;
483 vap->va_bytes = dbtob((u_quad_t)ip->i_din1->di_blocks);
484 vap->va_filerev = ip->i_din1->di_modrev;
485 } else {
486 vap->va_rdev = ip->i_din2->di_rdev;
487 vap->va_size = ip->i_din2->di_size;
488 vap->va_mtime.tv_sec = ip->i_din2->di_mtime;
489 vap->va_mtime.tv_nsec = ip->i_din2->di_mtimensec;
490 vap->va_ctime.tv_sec = ip->i_din2->di_ctime;
491 vap->va_ctime.tv_nsec = ip->i_din2->di_ctimensec;
492 vap->va_birthtime.tv_sec = ip->i_din2->di_birthtime;
493 vap->va_birthtime.tv_nsec = ip->i_din2->di_birthnsec;
494 vap->va_bytes = dbtob((u_quad_t)ip->i_din2->di_blocks);
495 vap->va_filerev = ip->i_din2->di_modrev;
496 }
497 vap->va_flags = ip->i_flags;
498 vap->va_gen = ip->i_gen;
499 vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize;
500 vap->va_type = IFTOVT(ip->i_mode);
501 return (0);
502 }
503
504 /*
505 * Set attribute vnode op. called from several syscalls
506 */
507 static int
508 ufs_setattr(ap)
509 struct vop_setattr_args /* {
510 struct vnode *a_vp;
511 struct vattr *a_vap;
512 struct ucred *a_cred;
513 } */ *ap;
514 {
515 struct vattr *vap = ap->a_vap;
516 struct vnode *vp = ap->a_vp;
517 struct inode *ip = VTOI(vp);
518 struct ucred *cred = ap->a_cred;
519 struct thread *td = curthread;
520 int error;
521
522 /*
523 * Check for unsettable attributes.
524 */
525 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
526 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
527 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
528 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
529 return (EINVAL);
530 }
531 if (vap->va_flags != VNOVAL) {
532 if ((vap->va_flags & ~(SF_APPEND | SF_ARCHIVED | SF_IMMUTABLE |
533 SF_NOUNLINK | SF_SNAPSHOT | UF_APPEND | UF_ARCHIVE |
534 UF_HIDDEN | UF_IMMUTABLE | UF_NODUMP | UF_NOUNLINK |
535 UF_OFFLINE | UF_OPAQUE | UF_READONLY | UF_REPARSE |
536 UF_SPARSE | UF_SYSTEM)) != 0)
537 return (EOPNOTSUPP);
538 if (vp->v_mount->mnt_flag & MNT_RDONLY)
539 return (EROFS);
540 /*
541 * Callers may only modify the file flags on objects they
542 * have VADMIN rights for.
543 */
544 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
545 return (error);
546 /*
547 * Unprivileged processes are not permitted to unset system
548 * flags, or modify flags if any system flags are set.
549 * Privileged non-jail processes may not modify system flags
550 * if securelevel > 0 and any existing system flags are set.
551 * Privileged jail processes behave like privileged non-jail
552 * processes if the security.jail.chflags_allowed sysctl is
553 * is non-zero; otherwise, they behave like unprivileged
554 * processes.
555 */
556 if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0)) {
557 if (ip->i_flags &
558 (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND)) {
559 error = securelevel_gt(cred, 0);
560 if (error)
561 return (error);
562 }
563 /* The snapshot flag cannot be toggled. */
564 if ((vap->va_flags ^ ip->i_flags) & SF_SNAPSHOT)
565 return (EPERM);
566 } else {
567 if (ip->i_flags &
568 (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND) ||
569 ((vap->va_flags ^ ip->i_flags) & SF_SETTABLE))
570 return (EPERM);
571 }
572 ip->i_flags = vap->va_flags;
573 DIP_SET(ip, i_flags, vap->va_flags);
574 ip->i_flag |= IN_CHANGE;
575 error = UFS_UPDATE(vp, 0);
576 if (ip->i_flags & (IMMUTABLE | APPEND))
577 return (error);
578 }
579 /*
580 * If immutable or append, no one can change any of its attributes
581 * except the ones already handled (in some cases, file flags
582 * including the immutability flags themselves for the superuser).
583 */
584 if (ip->i_flags & (IMMUTABLE | APPEND))
585 return (EPERM);
586 /*
587 * Go through the fields and update iff not VNOVAL.
588 */
589 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
590 if (vp->v_mount->mnt_flag & MNT_RDONLY)
591 return (EROFS);
592 if ((error = ufs_chown(vp, vap->va_uid, vap->va_gid, cred,
593 td)) != 0)
594 return (error);
595 }
596 if (vap->va_size != VNOVAL) {
597 /*
598 * XXX most of the following special cases should be in
599 * callers instead of in N filesystems. The VDIR check
600 * mostly already is.
601 */
602 switch (vp->v_type) {
603 case VDIR:
604 return (EISDIR);
605 case VLNK:
606 case VREG:
607 /*
608 * Truncation should have an effect in these cases.
609 * Disallow it if the filesystem is read-only or
610 * the file is being snapshotted.
611 */
612 if (vp->v_mount->mnt_flag & MNT_RDONLY)
613 return (EROFS);
614 if ((ip->i_flags & SF_SNAPSHOT) != 0)
615 return (EPERM);
616 break;
617 default:
618 /*
619 * According to POSIX, the result is unspecified
620 * for file types other than regular files,
621 * directories and shared memory objects. We
622 * don't support shared memory objects in the file
623 * system, and have dubious support for truncating
624 * symlinks. Just ignore the request in other cases.
625 */
626 return (0);
627 }
628 if ((error = UFS_TRUNCATE(vp, vap->va_size, IO_NORMAL |
629 ((vap->va_vaflags & VA_SYNC) != 0 ? IO_SYNC : 0),
630 cred)) != 0)
631 return (error);
632 }
633 if (vap->va_atime.tv_sec != VNOVAL ||
634 vap->va_mtime.tv_sec != VNOVAL ||
635 vap->va_birthtime.tv_sec != VNOVAL) {
636 if (vp->v_mount->mnt_flag & MNT_RDONLY)
637 return (EROFS);
638 if ((ip->i_flags & SF_SNAPSHOT) != 0)
639 return (EPERM);
640 error = vn_utimes_perm(vp, vap, cred, td);
641 if (error != 0)
642 return (error);
643 ip->i_flag |= IN_CHANGE | IN_MODIFIED;
644 if (vap->va_atime.tv_sec != VNOVAL) {
645 ip->i_flag &= ~IN_ACCESS;
646 DIP_SET(ip, i_atime, vap->va_atime.tv_sec);
647 DIP_SET(ip, i_atimensec, vap->va_atime.tv_nsec);
648 }
649 if (vap->va_mtime.tv_sec != VNOVAL) {
650 ip->i_flag &= ~IN_UPDATE;
651 DIP_SET(ip, i_mtime, vap->va_mtime.tv_sec);
652 DIP_SET(ip, i_mtimensec, vap->va_mtime.tv_nsec);
653 }
654 if (vap->va_birthtime.tv_sec != VNOVAL && I_IS_UFS2(ip)) {
655 ip->i_din2->di_birthtime = vap->va_birthtime.tv_sec;
656 ip->i_din2->di_birthnsec = vap->va_birthtime.tv_nsec;
657 }
658 error = UFS_UPDATE(vp, 0);
659 if (error)
660 return (error);
661 }
662 error = 0;
663 if (vap->va_mode != (mode_t)VNOVAL) {
664 if (vp->v_mount->mnt_flag & MNT_RDONLY)
665 return (EROFS);
666 if ((ip->i_flags & SF_SNAPSHOT) != 0 && (vap->va_mode &
667 (S_IXUSR | S_IWUSR | S_IXGRP | S_IWGRP | S_IXOTH | S_IWOTH)))
668 return (EPERM);
669 error = ufs_chmod(vp, (int)vap->va_mode, cred, td);
670 }
671 return (error);
672 }
673
674 #ifdef UFS_ACL
675 static int
676 ufs_update_nfs4_acl_after_mode_change(struct vnode *vp, int mode,
677 int file_owner_id, struct ucred *cred, struct thread *td)
678 {
679 int error;
680 struct acl *aclp;
681
682 aclp = acl_alloc(M_WAITOK);
683 error = ufs_getacl_nfs4_internal(vp, aclp, td);
684 /*
685 * We don't have to handle EOPNOTSUPP here, as the filesystem claims
686 * it supports ACLs.
687 */
688 if (error)
689 goto out;
690
691 acl_nfs4_sync_acl_from_mode(aclp, mode, file_owner_id);
692 error = ufs_setacl_nfs4_internal(vp, aclp, td);
693
694 out:
695 acl_free(aclp);
696 return (error);
697 }
698 #endif /* UFS_ACL */
699
700 /*
701 * Mark this file's access time for update for vfs_mark_atime(). This
702 * is called from execve() and mmap().
703 */
704 static int
705 ufs_markatime(ap)
706 struct vop_markatime_args /* {
707 struct vnode *a_vp;
708 } */ *ap;
709 {
710 struct vnode *vp = ap->a_vp;
711 struct inode *ip = VTOI(vp);
712
713 VI_LOCK(vp);
714 ip->i_flag |= IN_ACCESS;
715 VI_UNLOCK(vp);
716 /*
717 * XXXKIB No UFS_UPDATE(ap->a_vp, 0) there.
718 */
719 return (0);
720 }
721
722 /*
723 * Change the mode on a file.
724 * Inode must be locked before calling.
725 */
726 static int
727 ufs_chmod(vp, mode, cred, td)
728 struct vnode *vp;
729 int mode;
730 struct ucred *cred;
731 struct thread *td;
732 {
733 struct inode *ip = VTOI(vp);
734 int error;
735
736 /*
737 * To modify the permissions on a file, must possess VADMIN
738 * for that file.
739 */
740 if ((error = VOP_ACCESSX(vp, VWRITE_ACL, cred, td)))
741 return (error);
742 /*
743 * Privileged processes may set the sticky bit on non-directories,
744 * as well as set the setgid bit on a file with a group that the
745 * process is not a member of. Both of these are allowed in
746 * jail(8).
747 */
748 if (vp->v_type != VDIR && (mode & S_ISTXT)) {
749 if (priv_check_cred(cred, PRIV_VFS_STICKYFILE, 0))
750 return (EFTYPE);
751 }
752 if (!groupmember(ip->i_gid, cred) && (mode & ISGID)) {
753 error = priv_check_cred(cred, PRIV_VFS_SETGID, 0);
754 if (error)
755 return (error);
756 }
757
758 /*
759 * Deny setting setuid if we are not the file owner.
760 */
761 if ((mode & ISUID) && ip->i_uid != cred->cr_uid) {
762 error = priv_check_cred(cred, PRIV_VFS_ADMIN, 0);
763 if (error)
764 return (error);
765 }
766
767 ip->i_mode &= ~ALLPERMS;
768 ip->i_mode |= (mode & ALLPERMS);
769 DIP_SET(ip, i_mode, ip->i_mode);
770 ip->i_flag |= IN_CHANGE;
771 #ifdef UFS_ACL
772 if ((vp->v_mount->mnt_flag & MNT_NFS4ACLS) != 0)
773 error = ufs_update_nfs4_acl_after_mode_change(vp, mode, ip->i_uid, cred, td);
774 #endif
775 if (error == 0 && (ip->i_flag & IN_CHANGE) != 0)
776 error = UFS_UPDATE(vp, 0);
777
778 return (error);
779 }
780
781 /*
782 * Perform chown operation on inode ip;
783 * inode must be locked prior to call.
784 */
785 static int
786 ufs_chown(vp, uid, gid, cred, td)
787 struct vnode *vp;
788 uid_t uid;
789 gid_t gid;
790 struct ucred *cred;
791 struct thread *td;
792 {
793 struct inode *ip = VTOI(vp);
794 uid_t ouid;
795 gid_t ogid;
796 int error = 0;
797 #ifdef QUOTA
798 int i;
799 ufs2_daddr_t change;
800 #endif
801
802 if (uid == (uid_t)VNOVAL)
803 uid = ip->i_uid;
804 if (gid == (gid_t)VNOVAL)
805 gid = ip->i_gid;
806 /*
807 * To modify the ownership of a file, must possess VADMIN for that
808 * file.
809 */
810 if ((error = VOP_ACCESSX(vp, VWRITE_OWNER, cred, td)))
811 return (error);
812 /*
813 * To change the owner of a file, or change the group of a file to a
814 * group of which we are not a member, the caller must have
815 * privilege.
816 */
817 if (((uid != ip->i_uid && uid != cred->cr_uid) ||
818 (gid != ip->i_gid && !groupmember(gid, cred))) &&
819 (error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0)))
820 return (error);
821 ogid = ip->i_gid;
822 ouid = ip->i_uid;
823 #ifdef QUOTA
824 if ((error = getinoquota(ip)) != 0)
825 return (error);
826 if (ouid == uid) {
827 dqrele(vp, ip->i_dquot[USRQUOTA]);
828 ip->i_dquot[USRQUOTA] = NODQUOT;
829 }
830 if (ogid == gid) {
831 dqrele(vp, ip->i_dquot[GRPQUOTA]);
832 ip->i_dquot[GRPQUOTA] = NODQUOT;
833 }
834 change = DIP(ip, i_blocks);
835 (void) chkdq(ip, -change, cred, CHOWN);
836 (void) chkiq(ip, -1, cred, CHOWN);
837 for (i = 0; i < MAXQUOTAS; i++) {
838 dqrele(vp, ip->i_dquot[i]);
839 ip->i_dquot[i] = NODQUOT;
840 }
841 #endif
842 ip->i_gid = gid;
843 DIP_SET(ip, i_gid, gid);
844 ip->i_uid = uid;
845 DIP_SET(ip, i_uid, uid);
846 #ifdef QUOTA
847 if ((error = getinoquota(ip)) == 0) {
848 if (ouid == uid) {
849 dqrele(vp, ip->i_dquot[USRQUOTA]);
850 ip->i_dquot[USRQUOTA] = NODQUOT;
851 }
852 if (ogid == gid) {
853 dqrele(vp, ip->i_dquot[GRPQUOTA]);
854 ip->i_dquot[GRPQUOTA] = NODQUOT;
855 }
856 if ((error = chkdq(ip, change, cred, CHOWN)) == 0) {
857 if ((error = chkiq(ip, 1, cred, CHOWN)) == 0)
858 goto good;
859 else
860 (void) chkdq(ip, -change, cred, CHOWN|FORCE);
861 }
862 for (i = 0; i < MAXQUOTAS; i++) {
863 dqrele(vp, ip->i_dquot[i]);
864 ip->i_dquot[i] = NODQUOT;
865 }
866 }
867 ip->i_gid = ogid;
868 DIP_SET(ip, i_gid, ogid);
869 ip->i_uid = ouid;
870 DIP_SET(ip, i_uid, ouid);
871 if (getinoquota(ip) == 0) {
872 if (ouid == uid) {
873 dqrele(vp, ip->i_dquot[USRQUOTA]);
874 ip->i_dquot[USRQUOTA] = NODQUOT;
875 }
876 if (ogid == gid) {
877 dqrele(vp, ip->i_dquot[GRPQUOTA]);
878 ip->i_dquot[GRPQUOTA] = NODQUOT;
879 }
880 (void) chkdq(ip, change, cred, FORCE|CHOWN);
881 (void) chkiq(ip, 1, cred, FORCE|CHOWN);
882 (void) getinoquota(ip);
883 }
884 return (error);
885 good:
886 if (getinoquota(ip))
887 panic("ufs_chown: lost quota");
888 #endif /* QUOTA */
889 ip->i_flag |= IN_CHANGE;
890 if ((ip->i_mode & (ISUID | ISGID)) && (ouid != uid || ogid != gid)) {
891 if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID, 0)) {
892 ip->i_mode &= ~(ISUID | ISGID);
893 DIP_SET(ip, i_mode, ip->i_mode);
894 }
895 }
896 error = UFS_UPDATE(vp, 0);
897 return (error);
898 }
899
900 static int
901 ufs_remove(ap)
902 struct vop_remove_args /* {
903 struct vnode *a_dvp;
904 struct vnode *a_vp;
905 struct componentname *a_cnp;
906 } */ *ap;
907 {
908 struct inode *ip;
909 struct vnode *vp = ap->a_vp;
910 struct vnode *dvp = ap->a_dvp;
911 int error;
912 struct thread *td;
913
914 td = curthread;
915 ip = VTOI(vp);
916 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
917 (VTOI(dvp)->i_flags & APPEND)) {
918 error = EPERM;
919 goto out;
920 }
921 #ifdef UFS_GJOURNAL
922 ufs_gjournal_orphan(vp);
923 #endif
924 error = ufs_dirremove(dvp, ip, ap->a_cnp->cn_flags, 0);
925 if (ip->i_nlink <= 0)
926 vp->v_vflag |= VV_NOSYNC;
927 if ((ip->i_flags & SF_SNAPSHOT) != 0) {
928 /*
929 * Avoid deadlock where another thread is trying to
930 * update the inodeblock for dvp and is waiting on
931 * snaplk. Temporary unlock the vnode lock for the
932 * unlinked file and sync the directory. This should
933 * allow vput() of the directory to not block later on
934 * while holding the snapshot vnode locked, assuming
935 * that the directory hasn't been unlinked too.
936 */
937 VOP_UNLOCK(vp, 0);
938 (void) VOP_FSYNC(dvp, MNT_WAIT, td);
939 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
940 }
941 out:
942 return (error);
943 }
944
945 static void
946 print_bad_link_count(const char *funcname, struct vnode *dvp)
947 {
948 struct inode *dip;
949
950 dip = VTOI(dvp);
951 uprintf("%s: Bad link count %d on parent inode %jd in file system %s\n",
952 funcname, dip->i_effnlink, (intmax_t)dip->i_number,
953 dvp->v_mount->mnt_stat.f_mntonname);
954 }
955
956 /*
957 * link vnode call
958 */
959 static int
960 ufs_link(ap)
961 struct vop_link_args /* {
962 struct vnode *a_tdvp;
963 struct vnode *a_vp;
964 struct componentname *a_cnp;
965 } */ *ap;
966 {
967 struct vnode *vp = ap->a_vp;
968 struct vnode *tdvp = ap->a_tdvp;
969 struct componentname *cnp = ap->a_cnp;
970 struct inode *ip;
971 struct direct newdir;
972 int error;
973
974 #ifdef INVARIANTS
975 if ((cnp->cn_flags & HASBUF) == 0)
976 panic("ufs_link: no name");
977 #endif
978 if (VTOI(tdvp)->i_effnlink < 2) {
979 print_bad_link_count("ufs_link", tdvp);
980 error = EINVAL;
981 goto out;
982 }
983 ip = VTOI(vp);
984 if ((nlink_t)ip->i_nlink >= LINK_MAX) {
985 error = EMLINK;
986 goto out;
987 }
988 /*
989 * The file may have been removed after namei droped the original
990 * lock.
991 */
992 if (ip->i_effnlink == 0) {
993 error = ENOENT;
994 goto out;
995 }
996 if (ip->i_flags & (IMMUTABLE | APPEND)) {
997 error = EPERM;
998 goto out;
999 }
1000 ip->i_effnlink++;
1001 ip->i_nlink++;
1002 DIP_SET(ip, i_nlink, ip->i_nlink);
1003 ip->i_flag |= IN_CHANGE;
1004 if (DOINGSOFTDEP(vp))
1005 softdep_setup_link(VTOI(tdvp), ip);
1006 error = UFS_UPDATE(vp, !(DOINGSOFTDEP(vp) | DOINGASYNC(vp)));
1007 if (!error) {
1008 ufs_makedirentry(ip, cnp, &newdir);
1009 error = ufs_direnter(tdvp, vp, &newdir, cnp, NULL, 0);
1010 }
1011
1012 if (error) {
1013 ip->i_effnlink--;
1014 ip->i_nlink--;
1015 DIP_SET(ip, i_nlink, ip->i_nlink);
1016 ip->i_flag |= IN_CHANGE;
1017 if (DOINGSOFTDEP(vp))
1018 softdep_revert_link(VTOI(tdvp), ip);
1019 }
1020 out:
1021 return (error);
1022 }
1023
1024 /*
1025 * whiteout vnode call
1026 */
1027 static int
1028 ufs_whiteout(ap)
1029 struct vop_whiteout_args /* {
1030 struct vnode *a_dvp;
1031 struct componentname *a_cnp;
1032 int a_flags;
1033 } */ *ap;
1034 {
1035 struct vnode *dvp = ap->a_dvp;
1036 struct componentname *cnp = ap->a_cnp;
1037 struct direct newdir;
1038 int error = 0;
1039
1040 switch (ap->a_flags) {
1041 case LOOKUP:
1042 /* 4.4 format directories support whiteout operations */
1043 if (dvp->v_mount->mnt_maxsymlinklen > 0)
1044 return (0);
1045 return (EOPNOTSUPP);
1046
1047 case CREATE:
1048 /* create a new directory whiteout */
1049 #ifdef INVARIANTS
1050 if ((cnp->cn_flags & SAVENAME) == 0)
1051 panic("ufs_whiteout: missing name");
1052 if (dvp->v_mount->mnt_maxsymlinklen <= 0)
1053 panic("ufs_whiteout: old format filesystem");
1054 #endif
1055
1056 newdir.d_ino = WINO;
1057 newdir.d_namlen = cnp->cn_namelen;
1058 bcopy(cnp->cn_nameptr, newdir.d_name, (unsigned)cnp->cn_namelen + 1);
1059 newdir.d_type = DT_WHT;
1060 error = ufs_direnter(dvp, NULL, &newdir, cnp, NULL, 0);
1061 break;
1062
1063 case DELETE:
1064 /* remove an existing directory whiteout */
1065 #ifdef INVARIANTS
1066 if (dvp->v_mount->mnt_maxsymlinklen <= 0)
1067 panic("ufs_whiteout: old format filesystem");
1068 #endif
1069
1070 cnp->cn_flags &= ~DOWHITEOUT;
1071 error = ufs_dirremove(dvp, NULL, cnp->cn_flags, 0);
1072 break;
1073 default:
1074 panic("ufs_whiteout: unknown op");
1075 }
1076 return (error);
1077 }
1078
1079 static volatile int rename_restarts;
1080 SYSCTL_INT(_vfs_ufs, OID_AUTO, rename_restarts, CTLFLAG_RD,
1081 __DEVOLATILE(int *, &rename_restarts), 0,
1082 "Times rename had to restart due to lock contention");
1083
1084 /*
1085 * Rename system call.
1086 * rename("foo", "bar");
1087 * is essentially
1088 * unlink("bar");
1089 * link("foo", "bar");
1090 * unlink("foo");
1091 * but ``atomically''. Can't do full commit without saving state in the
1092 * inode on disk which isn't feasible at this time. Best we can do is
1093 * always guarantee the target exists.
1094 *
1095 * Basic algorithm is:
1096 *
1097 * 1) Bump link count on source while we're linking it to the
1098 * target. This also ensure the inode won't be deleted out
1099 * from underneath us while we work (it may be truncated by
1100 * a concurrent `trunc' or `open' for creation).
1101 * 2) Link source to destination. If destination already exists,
1102 * delete it first.
1103 * 3) Unlink source reference to inode if still around. If a
1104 * directory was moved and the parent of the destination
1105 * is different from the source, patch the ".." entry in the
1106 * directory.
1107 */
1108 static int
1109 ufs_rename(ap)
1110 struct vop_rename_args /* {
1111 struct vnode *a_fdvp;
1112 struct vnode *a_fvp;
1113 struct componentname *a_fcnp;
1114 struct vnode *a_tdvp;
1115 struct vnode *a_tvp;
1116 struct componentname *a_tcnp;
1117 } */ *ap;
1118 {
1119 struct vnode *tvp = ap->a_tvp;
1120 struct vnode *tdvp = ap->a_tdvp;
1121 struct vnode *fvp = ap->a_fvp;
1122 struct vnode *fdvp = ap->a_fdvp;
1123 struct vnode *nvp;
1124 struct componentname *tcnp = ap->a_tcnp;
1125 struct componentname *fcnp = ap->a_fcnp;
1126 struct thread *td = fcnp->cn_thread;
1127 struct inode *fip, *tip, *tdp, *fdp;
1128 struct direct newdir;
1129 off_t endoff;
1130 int doingdirectory, newparent;
1131 int error = 0;
1132 struct mount *mp;
1133 ino_t ino;
1134
1135 #ifdef INVARIANTS
1136 if ((tcnp->cn_flags & HASBUF) == 0 ||
1137 (fcnp->cn_flags & HASBUF) == 0)
1138 panic("ufs_rename: no name");
1139 #endif
1140 endoff = 0;
1141 mp = tdvp->v_mount;
1142 VOP_UNLOCK(tdvp, 0);
1143 if (tvp && tvp != tdvp)
1144 VOP_UNLOCK(tvp, 0);
1145 /*
1146 * Check for cross-device rename.
1147 */
1148 if ((fvp->v_mount != tdvp->v_mount) ||
1149 (tvp && (fvp->v_mount != tvp->v_mount))) {
1150 error = EXDEV;
1151 mp = NULL;
1152 goto releout;
1153 }
1154 relock:
1155 /*
1156 * We need to acquire 2 to 4 locks depending on whether tvp is NULL
1157 * and fdvp and tdvp are the same directory. Subsequently we need
1158 * to double-check all paths and in the directory rename case we
1159 * need to verify that we are not creating a directory loop. To
1160 * handle this we acquire all but fdvp using non-blocking
1161 * acquisitions. If we fail to acquire any lock in the path we will
1162 * drop all held locks, acquire the new lock in a blocking fashion,
1163 * and then release it and restart the rename. This acquire/release
1164 * step ensures that we do not spin on a lock waiting for release.
1165 */
1166 error = vn_lock(fdvp, LK_EXCLUSIVE);
1167 if (error)
1168 goto releout;
1169 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) {
1170 VOP_UNLOCK(fdvp, 0);
1171 error = vn_lock(tdvp, LK_EXCLUSIVE);
1172 if (error)
1173 goto releout;
1174 VOP_UNLOCK(tdvp, 0);
1175 atomic_add_int(&rename_restarts, 1);
1176 goto relock;
1177 }
1178 /*
1179 * Re-resolve fvp to be certain it still exists and fetch the
1180 * correct vnode.
1181 */
1182 error = ufs_lookup_ino(fdvp, NULL, fcnp, &ino);
1183 if (error) {
1184 VOP_UNLOCK(fdvp, 0);
1185 VOP_UNLOCK(tdvp, 0);
1186 goto releout;
1187 }
1188 error = VFS_VGET(mp, ino, LK_EXCLUSIVE | LK_NOWAIT, &nvp);
1189 if (error) {
1190 VOP_UNLOCK(fdvp, 0);
1191 VOP_UNLOCK(tdvp, 0);
1192 if (error != EBUSY)
1193 goto releout;
1194 error = VFS_VGET(mp, ino, LK_EXCLUSIVE, &nvp);
1195 if (error != 0)
1196 goto releout;
1197 VOP_UNLOCK(nvp, 0);
1198 vrele(fvp);
1199 fvp = nvp;
1200 atomic_add_int(&rename_restarts, 1);
1201 goto relock;
1202 }
1203 vrele(fvp);
1204 fvp = nvp;
1205 /*
1206 * Re-resolve tvp and acquire the vnode lock if present.
1207 */
1208 error = ufs_lookup_ino(tdvp, NULL, tcnp, &ino);
1209 if (error != 0 && error != EJUSTRETURN) {
1210 VOP_UNLOCK(fdvp, 0);
1211 VOP_UNLOCK(tdvp, 0);
1212 VOP_UNLOCK(fvp, 0);
1213 goto releout;
1214 }
1215 /*
1216 * If tvp disappeared we just carry on.
1217 */
1218 if (error == EJUSTRETURN && tvp != NULL) {
1219 vrele(tvp);
1220 tvp = NULL;
1221 }
1222 /*
1223 * Get the tvp ino if the lookup succeeded. We may have to restart
1224 * if the non-blocking acquire fails.
1225 */
1226 if (error == 0) {
1227 nvp = NULL;
1228 error = VFS_VGET(mp, ino, LK_EXCLUSIVE | LK_NOWAIT, &nvp);
1229 if (tvp)
1230 vrele(tvp);
1231 tvp = nvp;
1232 if (error) {
1233 VOP_UNLOCK(fdvp, 0);
1234 VOP_UNLOCK(tdvp, 0);
1235 VOP_UNLOCK(fvp, 0);
1236 if (error != EBUSY)
1237 goto releout;
1238 error = VFS_VGET(mp, ino, LK_EXCLUSIVE, &nvp);
1239 if (error != 0)
1240 goto releout;
1241 vput(nvp);
1242 atomic_add_int(&rename_restarts, 1);
1243 goto relock;
1244 }
1245 }
1246 fdp = VTOI(fdvp);
1247 fip = VTOI(fvp);
1248 tdp = VTOI(tdvp);
1249 tip = NULL;
1250 if (tvp)
1251 tip = VTOI(tvp);
1252 if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
1253 (VTOI(tdvp)->i_flags & APPEND))) {
1254 error = EPERM;
1255 goto unlockout;
1256 }
1257 /*
1258 * Renaming a file to itself has no effect. The upper layers should
1259 * not call us in that case. However, things could change after
1260 * we drop the locks above.
1261 */
1262 if (fvp == tvp) {
1263 error = 0;
1264 goto unlockout;
1265 }
1266 doingdirectory = 0;
1267 newparent = 0;
1268 ino = fip->i_number;
1269 if (fip->i_nlink >= LINK_MAX) {
1270 error = EMLINK;
1271 goto unlockout;
1272 }
1273 if ((fip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))
1274 || (fdp->i_flags & APPEND)) {
1275 error = EPERM;
1276 goto unlockout;
1277 }
1278 if ((fip->i_mode & IFMT) == IFDIR) {
1279 /*
1280 * Avoid ".", "..", and aliases of "." for obvious reasons.
1281 */
1282 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
1283 fdp == fip ||
1284 (fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT) {
1285 error = EINVAL;
1286 goto unlockout;
1287 }
1288 if (fdp->i_number != tdp->i_number)
1289 newparent = tdp->i_number;
1290 doingdirectory = 1;
1291 }
1292 if ((fvp->v_type == VDIR && fvp->v_mountedhere != NULL) ||
1293 (tvp != NULL && tvp->v_type == VDIR &&
1294 tvp->v_mountedhere != NULL)) {
1295 error = EXDEV;
1296 goto unlockout;
1297 }
1298
1299 /*
1300 * If ".." must be changed (ie the directory gets a new
1301 * parent) then the source directory must not be in the
1302 * directory hierarchy above the target, as this would
1303 * orphan everything below the source directory. Also
1304 * the user must have write permission in the source so
1305 * as to be able to change "..".
1306 */
1307 if (doingdirectory && newparent) {
1308 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread);
1309 if (error)
1310 goto unlockout;
1311 error = ufs_checkpath(ino, fdp->i_number, tdp, tcnp->cn_cred,
1312 &ino);
1313 /*
1314 * We encountered a lock that we have to wait for. Unlock
1315 * everything else and VGET before restarting.
1316 */
1317 if (ino) {
1318 VOP_UNLOCK(fdvp, 0);
1319 VOP_UNLOCK(fvp, 0);
1320 VOP_UNLOCK(tdvp, 0);
1321 if (tvp)
1322 VOP_UNLOCK(tvp, 0);
1323 error = VFS_VGET(mp, ino, LK_SHARED, &nvp);
1324 if (error == 0)
1325 vput(nvp);
1326 atomic_add_int(&rename_restarts, 1);
1327 goto relock;
1328 }
1329 if (error)
1330 goto unlockout;
1331 if ((tcnp->cn_flags & SAVESTART) == 0)
1332 panic("ufs_rename: lost to startdir");
1333 }
1334 if (fip->i_effnlink == 0 || fdp->i_effnlink == 0 ||
1335 tdp->i_effnlink == 0)
1336 panic("Bad effnlink fip %p, fdp %p, tdp %p", fip, fdp, tdp);
1337
1338 /*
1339 * 1) Bump link count while we're moving stuff
1340 * around. If we crash somewhere before
1341 * completing our work, the link count
1342 * may be wrong, but correctable.
1343 */
1344 fip->i_effnlink++;
1345 fip->i_nlink++;
1346 DIP_SET(fip, i_nlink, fip->i_nlink);
1347 fip->i_flag |= IN_CHANGE;
1348 if (DOINGSOFTDEP(fvp))
1349 softdep_setup_link(tdp, fip);
1350 error = UFS_UPDATE(fvp, !(DOINGSOFTDEP(fvp) | DOINGASYNC(fvp)));
1351 if (error)
1352 goto bad;
1353
1354 /*
1355 * 2) If target doesn't exist, link the target
1356 * to the source and unlink the source.
1357 * Otherwise, rewrite the target directory
1358 * entry to reference the source inode and
1359 * expunge the original entry's existence.
1360 */
1361 if (tip == NULL) {
1362 if (ITODEV(tdp) != ITODEV(fip))
1363 panic("ufs_rename: EXDEV");
1364 if (doingdirectory && newparent) {
1365 /*
1366 * Account for ".." in new directory.
1367 * When source and destination have the same
1368 * parent we don't adjust the link count. The
1369 * actual link modification is completed when
1370 * .. is rewritten below.
1371 */
1372 if ((nlink_t)tdp->i_nlink >= LINK_MAX) {
1373 error = EMLINK;
1374 goto bad;
1375 }
1376 }
1377 ufs_makedirentry(fip, tcnp, &newdir);
1378 error = ufs_direnter(tdvp, NULL, &newdir, tcnp, NULL, 1);
1379 if (error)
1380 goto bad;
1381 /* Setup tdvp for directory compaction if needed. */
1382 if (tdp->i_count && tdp->i_endoff &&
1383 tdp->i_endoff < tdp->i_size)
1384 endoff = tdp->i_endoff;
1385 } else {
1386 if (ITODEV(tip) != ITODEV(tdp) || ITODEV(tip) != ITODEV(fip))
1387 panic("ufs_rename: EXDEV");
1388 /*
1389 * Short circuit rename(foo, foo).
1390 */
1391 if (tip->i_number == fip->i_number)
1392 panic("ufs_rename: same file");
1393 /*
1394 * If the parent directory is "sticky", then the caller
1395 * must possess VADMIN for the parent directory, or the
1396 * destination of the rename. This implements append-only
1397 * directories.
1398 */
1399 if ((tdp->i_mode & S_ISTXT) &&
1400 VOP_ACCESS(tdvp, VADMIN, tcnp->cn_cred, td) &&
1401 VOP_ACCESS(tvp, VADMIN, tcnp->cn_cred, td)) {
1402 error = EPERM;
1403 goto bad;
1404 }
1405 /*
1406 * Target must be empty if a directory and have no links
1407 * to it. Also, ensure source and target are compatible
1408 * (both directories, or both not directories).
1409 */
1410 if ((tip->i_mode & IFMT) == IFDIR) {
1411 if ((tip->i_effnlink > 2) ||
1412 !ufs_dirempty(tip, tdp->i_number, tcnp->cn_cred)) {
1413 error = ENOTEMPTY;
1414 goto bad;
1415 }
1416 if (!doingdirectory) {
1417 error = ENOTDIR;
1418 goto bad;
1419 }
1420 cache_purge(tdvp);
1421 } else if (doingdirectory) {
1422 error = EISDIR;
1423 goto bad;
1424 }
1425 if (doingdirectory) {
1426 if (!newparent) {
1427 tdp->i_effnlink--;
1428 if (DOINGSOFTDEP(tdvp))
1429 softdep_change_linkcnt(tdp);
1430 }
1431 tip->i_effnlink--;
1432 if (DOINGSOFTDEP(tvp))
1433 softdep_change_linkcnt(tip);
1434 }
1435 error = ufs_dirrewrite(tdp, tip, fip->i_number,
1436 IFTODT(fip->i_mode),
1437 (doingdirectory && newparent) ? newparent : doingdirectory);
1438 if (error) {
1439 if (doingdirectory) {
1440 if (!newparent) {
1441 tdp->i_effnlink++;
1442 if (DOINGSOFTDEP(tdvp))
1443 softdep_change_linkcnt(tdp);
1444 }
1445 tip->i_effnlink++;
1446 if (DOINGSOFTDEP(tvp))
1447 softdep_change_linkcnt(tip);
1448 }
1449 }
1450 if (doingdirectory && !DOINGSOFTDEP(tvp)) {
1451 /*
1452 * The only stuff left in the directory is "."
1453 * and "..". The "." reference is inconsequential
1454 * since we are quashing it. We have removed the "."
1455 * reference and the reference in the parent directory,
1456 * but there may be other hard links. The soft
1457 * dependency code will arrange to do these operations
1458 * after the parent directory entry has been deleted on
1459 * disk, so when running with that code we avoid doing
1460 * them now.
1461 */
1462 if (!newparent) {
1463 tdp->i_nlink--;
1464 DIP_SET(tdp, i_nlink, tdp->i_nlink);
1465 tdp->i_flag |= IN_CHANGE;
1466 }
1467 tip->i_nlink--;
1468 DIP_SET(tip, i_nlink, tip->i_nlink);
1469 tip->i_flag |= IN_CHANGE;
1470 }
1471 }
1472
1473 /*
1474 * 3) Unlink the source. We have to resolve the path again to
1475 * fixup the directory offset and count for ufs_dirremove.
1476 */
1477 if (fdvp == tdvp) {
1478 error = ufs_lookup_ino(fdvp, NULL, fcnp, &ino);
1479 if (error)
1480 panic("ufs_rename: from entry went away!");
1481 if (ino != fip->i_number)
1482 panic("ufs_rename: ino mismatch %ju != %ju\n",
1483 (uintmax_t)ino, (uintmax_t)fip->i_number);
1484 }
1485 /*
1486 * If the source is a directory with a
1487 * new parent, the link count of the old
1488 * parent directory must be decremented
1489 * and ".." set to point to the new parent.
1490 */
1491 if (doingdirectory && newparent) {
1492 /*
1493 * If tip exists we simply use its link, otherwise we must
1494 * add a new one.
1495 */
1496 if (tip == NULL) {
1497 tdp->i_effnlink++;
1498 tdp->i_nlink++;
1499 DIP_SET(tdp, i_nlink, tdp->i_nlink);
1500 tdp->i_flag |= IN_CHANGE;
1501 if (DOINGSOFTDEP(tdvp))
1502 softdep_setup_dotdot_link(tdp, fip);
1503 error = UFS_UPDATE(tdvp, !(DOINGSOFTDEP(tdvp) |
1504 DOINGASYNC(tdvp)));
1505 /* Don't go to bad here as the new link exists. */
1506 if (error)
1507 goto unlockout;
1508 } else if (DOINGSUJ(tdvp))
1509 /* Journal must account for each new link. */
1510 softdep_setup_dotdot_link(tdp, fip);
1511 fip->i_offset = mastertemplate.dot_reclen;
1512 ufs_dirrewrite(fip, fdp, newparent, DT_DIR, 0);
1513 cache_purge(fdvp);
1514 }
1515 error = ufs_dirremove(fdvp, fip, fcnp->cn_flags, 0);
1516 /*
1517 * The kern_renameat() looks up the fvp using the DELETE flag, which
1518 * causes the removal of the name cache entry for fvp.
1519 * As the relookup of the fvp is done in two steps:
1520 * ufs_lookup_ino() and then VFS_VGET(), another thread might do a
1521 * normal lookup of the from name just before the VFS_VGET() call,
1522 * causing the cache entry to be re-instantiated.
1523 *
1524 * The same issue also applies to tvp if it exists as
1525 * otherwise we may have a stale name cache entry for the new
1526 * name that references the old i-node if it has other links
1527 * or open file descriptors.
1528 */
1529 cache_purge(fvp);
1530 if (tvp)
1531 cache_purge(tvp);
1532 cache_purge_negative(tdvp);
1533
1534 unlockout:
1535 vput(fdvp);
1536 vput(fvp);
1537 if (tvp)
1538 vput(tvp);
1539 /*
1540 * If compaction or fsync was requested do it now that other locks
1541 * are no longer needed.
1542 */
1543 if (error == 0 && endoff != 0) {
1544 error = UFS_TRUNCATE(tdvp, endoff, IO_NORMAL | IO_SYNC,
1545 tcnp->cn_cred);
1546 if (error != 0)
1547 vn_printf(tdvp, "ufs_rename: failed to truncate "
1548 "err %d", error);
1549 #ifdef UFS_DIRHASH
1550 else if (tdp->i_dirhash != NULL)
1551 ufsdirhash_dirtrunc(tdp, endoff);
1552 #endif
1553 /*
1554 * Even if the directory compaction failed, rename was
1555 * succesful. Do not propagate a UFS_TRUNCATE() error
1556 * to the caller.
1557 */
1558 error = 0;
1559 }
1560 if (error == 0 && tdp->i_flag & IN_NEEDSYNC)
1561 error = VOP_FSYNC(tdvp, MNT_WAIT, td);
1562 vput(tdvp);
1563 return (error);
1564
1565 bad:
1566 fip->i_effnlink--;
1567 fip->i_nlink--;
1568 DIP_SET(fip, i_nlink, fip->i_nlink);
1569 fip->i_flag |= IN_CHANGE;
1570 if (DOINGSOFTDEP(fvp))
1571 softdep_revert_link(tdp, fip);
1572 goto unlockout;
1573
1574 releout:
1575 vrele(fdvp);
1576 vrele(fvp);
1577 vrele(tdvp);
1578 if (tvp)
1579 vrele(tvp);
1580
1581 return (error);
1582 }
1583
1584 #ifdef UFS_ACL
1585 static int
1586 ufs_do_posix1e_acl_inheritance_dir(struct vnode *dvp, struct vnode *tvp,
1587 mode_t dmode, struct ucred *cred, struct thread *td)
1588 {
1589 int error;
1590 struct inode *ip = VTOI(tvp);
1591 struct acl *dacl, *acl;
1592
1593 acl = acl_alloc(M_WAITOK);
1594 dacl = acl_alloc(M_WAITOK);
1595
1596 /*
1597 * Retrieve default ACL from parent, if any.
1598 */
1599 error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cred, td);
1600 switch (error) {
1601 case 0:
1602 /*
1603 * Retrieved a default ACL, so merge mode and ACL if
1604 * necessary. If the ACL is empty, fall through to
1605 * the "not defined or available" case.
1606 */
1607 if (acl->acl_cnt != 0) {
1608 dmode = acl_posix1e_newfilemode(dmode, acl);
1609 ip->i_mode = dmode;
1610 DIP_SET(ip, i_mode, dmode);
1611 *dacl = *acl;
1612 ufs_sync_acl_from_inode(ip, acl);
1613 break;
1614 }
1615 /* FALLTHROUGH */
1616
1617 case EOPNOTSUPP:
1618 /*
1619 * Just use the mode as-is.
1620 */
1621 ip->i_mode = dmode;
1622 DIP_SET(ip, i_mode, dmode);
1623 error = 0;
1624 goto out;
1625
1626 default:
1627 goto out;
1628 }
1629
1630 /*
1631 * XXX: If we abort now, will Soft Updates notify the extattr
1632 * code that the EAs for the file need to be released?
1633 */
1634 error = VOP_SETACL(tvp, ACL_TYPE_ACCESS, acl, cred, td);
1635 if (error == 0)
1636 error = VOP_SETACL(tvp, ACL_TYPE_DEFAULT, dacl, cred, td);
1637 switch (error) {
1638 case 0:
1639 break;
1640
1641 case EOPNOTSUPP:
1642 /*
1643 * XXX: This should not happen, as EOPNOTSUPP above
1644 * was supposed to free acl.
1645 */
1646 printf("ufs_mkdir: VOP_GETACL() but no VOP_SETACL()\n");
1647 /*
1648 panic("ufs_mkdir: VOP_GETACL() but no VOP_SETACL()");
1649 */
1650 break;
1651
1652 default:
1653 goto out;
1654 }
1655
1656 out:
1657 acl_free(acl);
1658 acl_free(dacl);
1659
1660 return (error);
1661 }
1662
1663 static int
1664 ufs_do_posix1e_acl_inheritance_file(struct vnode *dvp, struct vnode *tvp,
1665 mode_t mode, struct ucred *cred, struct thread *td)
1666 {
1667 int error;
1668 struct inode *ip = VTOI(tvp);
1669 struct acl *acl;
1670
1671 acl = acl_alloc(M_WAITOK);
1672
1673 /*
1674 * Retrieve default ACL for parent, if any.
1675 */
1676 error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cred, td);
1677 switch (error) {
1678 case 0:
1679 /*
1680 * Retrieved a default ACL, so merge mode and ACL if
1681 * necessary.
1682 */
1683 if (acl->acl_cnt != 0) {
1684 /*
1685 * Two possible ways for default ACL to not
1686 * be present. First, the EA can be
1687 * undefined, or second, the default ACL can
1688 * be blank. If it's blank, fall through to
1689 * the it's not defined case.
1690 */
1691 mode = acl_posix1e_newfilemode(mode, acl);
1692 ip->i_mode = mode;
1693 DIP_SET(ip, i_mode, mode);
1694 ufs_sync_acl_from_inode(ip, acl);
1695 break;
1696 }
1697 /* FALLTHROUGH */
1698
1699 case EOPNOTSUPP:
1700 /*
1701 * Just use the mode as-is.
1702 */
1703 ip->i_mode = mode;
1704 DIP_SET(ip, i_mode, mode);
1705 error = 0;
1706 goto out;
1707
1708 default:
1709 goto out;
1710 }
1711
1712 /*
1713 * XXX: If we abort now, will Soft Updates notify the extattr
1714 * code that the EAs for the file need to be released?
1715 */
1716 error = VOP_SETACL(tvp, ACL_TYPE_ACCESS, acl, cred, td);
1717 switch (error) {
1718 case 0:
1719 break;
1720
1721 case EOPNOTSUPP:
1722 /*
1723 * XXX: This should not happen, as EOPNOTSUPP above was
1724 * supposed to free acl.
1725 */
1726 printf("ufs_do_posix1e_acl_inheritance_file: VOP_GETACL() "
1727 "but no VOP_SETACL()\n");
1728 /* panic("ufs_do_posix1e_acl_inheritance_file: VOP_GETACL() "
1729 "but no VOP_SETACL()"); */
1730 break;
1731
1732 default:
1733 goto out;
1734 }
1735
1736 out:
1737 acl_free(acl);
1738
1739 return (error);
1740 }
1741
1742 static int
1743 ufs_do_nfs4_acl_inheritance(struct vnode *dvp, struct vnode *tvp,
1744 mode_t child_mode, struct ucred *cred, struct thread *td)
1745 {
1746 int error;
1747 struct acl *parent_aclp, *child_aclp;
1748
1749 parent_aclp = acl_alloc(M_WAITOK);
1750 child_aclp = acl_alloc(M_WAITOK | M_ZERO);
1751
1752 error = ufs_getacl_nfs4_internal(dvp, parent_aclp, td);
1753 if (error)
1754 goto out;
1755 acl_nfs4_compute_inherited_acl(parent_aclp, child_aclp,
1756 child_mode, VTOI(tvp)->i_uid, tvp->v_type == VDIR);
1757 error = ufs_setacl_nfs4_internal(tvp, child_aclp, td);
1758 if (error)
1759 goto out;
1760 out:
1761 acl_free(parent_aclp);
1762 acl_free(child_aclp);
1763
1764 return (error);
1765 }
1766 #endif
1767
1768 /*
1769 * Mkdir system call
1770 */
1771 static int
1772 ufs_mkdir(ap)
1773 struct vop_mkdir_args /* {
1774 struct vnode *a_dvp;
1775 struct vnode **a_vpp;
1776 struct componentname *a_cnp;
1777 struct vattr *a_vap;
1778 } */ *ap;
1779 {
1780 struct vnode *dvp = ap->a_dvp;
1781 struct vattr *vap = ap->a_vap;
1782 struct componentname *cnp = ap->a_cnp;
1783 struct inode *ip, *dp;
1784 struct vnode *tvp;
1785 struct buf *bp;
1786 struct dirtemplate dirtemplate, *dtp;
1787 struct direct newdir;
1788 int error, dmode;
1789 long blkoff;
1790
1791 #ifdef INVARIANTS
1792 if ((cnp->cn_flags & HASBUF) == 0)
1793 panic("ufs_mkdir: no name");
1794 #endif
1795 dp = VTOI(dvp);
1796 if ((nlink_t)dp->i_nlink >= LINK_MAX) {
1797 error = EMLINK;
1798 goto out;
1799 }
1800 dmode = vap->va_mode & 0777;
1801 dmode |= IFDIR;
1802 /*
1803 * Must simulate part of ufs_makeinode here to acquire the inode,
1804 * but not have it entered in the parent directory. The entry is
1805 * made later after writing "." and ".." entries.
1806 */
1807 if (dp->i_effnlink < 2) {
1808 print_bad_link_count("ufs_mkdir", dvp);
1809 error = EINVAL;
1810 goto out;
1811 }
1812 error = UFS_VALLOC(dvp, dmode, cnp->cn_cred, &tvp);
1813 if (error)
1814 goto out;
1815 ip = VTOI(tvp);
1816 ip->i_gid = dp->i_gid;
1817 DIP_SET(ip, i_gid, dp->i_gid);
1818 #ifdef SUIDDIR
1819 {
1820 #ifdef QUOTA
1821 struct ucred ucred, *ucp;
1822 gid_t ucred_group;
1823 ucp = cnp->cn_cred;
1824 #endif
1825 /*
1826 * If we are hacking owners here, (only do this where told to)
1827 * and we are not giving it TO root, (would subvert quotas)
1828 * then go ahead and give it to the other user.
1829 * The new directory also inherits the SUID bit.
1830 * If user's UID and dir UID are the same,
1831 * 'give it away' so that the SUID is still forced on.
1832 */
1833 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) &&
1834 (dp->i_mode & ISUID) && dp->i_uid) {
1835 dmode |= ISUID;
1836 ip->i_uid = dp->i_uid;
1837 DIP_SET(ip, i_uid, dp->i_uid);
1838 #ifdef QUOTA
1839 if (dp->i_uid != cnp->cn_cred->cr_uid) {
1840 /*
1841 * Make sure the correct user gets charged
1842 * for the space.
1843 * Make a dummy credential for the victim.
1844 * XXX This seems to never be accessed out of
1845 * our context so a stack variable is ok.
1846 */
1847 refcount_init(&ucred.cr_ref, 1);
1848 ucred.cr_uid = ip->i_uid;
1849 ucred.cr_ngroups = 1;
1850 ucred.cr_groups = &ucred_group;
1851 ucred.cr_groups[0] = dp->i_gid;
1852 ucp = &ucred;
1853 }
1854 #endif
1855 } else {
1856 ip->i_uid = cnp->cn_cred->cr_uid;
1857 DIP_SET(ip, i_uid, ip->i_uid);
1858 }
1859 #ifdef QUOTA
1860 if ((error = getinoquota(ip)) ||
1861 (error = chkiq(ip, 1, ucp, 0))) {
1862 if (DOINGSOFTDEP(tvp))
1863 softdep_revert_link(dp, ip);
1864 UFS_VFREE(tvp, ip->i_number, dmode);
1865 vput(tvp);
1866 return (error);
1867 }
1868 #endif
1869 }
1870 #else /* !SUIDDIR */
1871 ip->i_uid = cnp->cn_cred->cr_uid;
1872 DIP_SET(ip, i_uid, ip->i_uid);
1873 #ifdef QUOTA
1874 if ((error = getinoquota(ip)) ||
1875 (error = chkiq(ip, 1, cnp->cn_cred, 0))) {
1876 if (DOINGSOFTDEP(tvp))
1877 softdep_revert_link(dp, ip);
1878 UFS_VFREE(tvp, ip->i_number, dmode);
1879 vput(tvp);
1880 return (error);
1881 }
1882 #endif
1883 #endif /* !SUIDDIR */
1884 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
1885 ip->i_mode = dmode;
1886 DIP_SET(ip, i_mode, dmode);
1887 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */
1888 ip->i_effnlink = 2;
1889 ip->i_nlink = 2;
1890 DIP_SET(ip, i_nlink, 2);
1891
1892 if (cnp->cn_flags & ISWHITEOUT) {
1893 ip->i_flags |= UF_OPAQUE;
1894 DIP_SET(ip, i_flags, ip->i_flags);
1895 }
1896
1897 /*
1898 * Bump link count in parent directory to reflect work done below.
1899 * Should be done before reference is created so cleanup is
1900 * possible if we crash.
1901 */
1902 dp->i_effnlink++;
1903 dp->i_nlink++;
1904 DIP_SET(dp, i_nlink, dp->i_nlink);
1905 dp->i_flag |= IN_CHANGE;
1906 if (DOINGSOFTDEP(dvp))
1907 softdep_setup_mkdir(dp, ip);
1908 error = UFS_UPDATE(dvp, !(DOINGSOFTDEP(dvp) | DOINGASYNC(dvp)));
1909 if (error)
1910 goto bad;
1911 #ifdef MAC
1912 if (dvp->v_mount->mnt_flag & MNT_MULTILABEL) {
1913 error = mac_vnode_create_extattr(cnp->cn_cred, dvp->v_mount,
1914 dvp, tvp, cnp);
1915 if (error)
1916 goto bad;
1917 }
1918 #endif
1919 #ifdef UFS_ACL
1920 if (dvp->v_mount->mnt_flag & MNT_ACLS) {
1921 error = ufs_do_posix1e_acl_inheritance_dir(dvp, tvp, dmode,
1922 cnp->cn_cred, cnp->cn_thread);
1923 if (error)
1924 goto bad;
1925 } else if (dvp->v_mount->mnt_flag & MNT_NFS4ACLS) {
1926 error = ufs_do_nfs4_acl_inheritance(dvp, tvp, dmode,
1927 cnp->cn_cred, cnp->cn_thread);
1928 if (error)
1929 goto bad;
1930 }
1931 #endif /* !UFS_ACL */
1932
1933 /*
1934 * Initialize directory with "." and ".." from static template.
1935 */
1936 if (dvp->v_mount->mnt_maxsymlinklen > 0)
1937 dtp = &mastertemplate;
1938 else
1939 dtp = (struct dirtemplate *)&omastertemplate;
1940 dirtemplate = *dtp;
1941 dirtemplate.dot_ino = ip->i_number;
1942 dirtemplate.dotdot_ino = dp->i_number;
1943 vnode_pager_setsize(tvp, DIRBLKSIZ);
1944 if ((error = UFS_BALLOC(tvp, (off_t)0, DIRBLKSIZ, cnp->cn_cred,
1945 BA_CLRBUF, &bp)) != 0)
1946 goto bad;
1947 ip->i_size = DIRBLKSIZ;
1948 DIP_SET(ip, i_size, DIRBLKSIZ);
1949 ip->i_flag |= IN_CHANGE | IN_UPDATE;
1950 bcopy((caddr_t)&dirtemplate, (caddr_t)bp->b_data, sizeof dirtemplate);
1951 if (DOINGSOFTDEP(tvp)) {
1952 /*
1953 * Ensure that the entire newly allocated block is a
1954 * valid directory so that future growth within the
1955 * block does not have to ensure that the block is
1956 * written before the inode.
1957 */
1958 blkoff = DIRBLKSIZ;
1959 while (blkoff < bp->b_bcount) {
1960 ((struct direct *)
1961 (bp->b_data + blkoff))->d_reclen = DIRBLKSIZ;
1962 blkoff += DIRBLKSIZ;
1963 }
1964 }
1965 if ((error = UFS_UPDATE(tvp, !(DOINGSOFTDEP(tvp) |
1966 DOINGASYNC(tvp)))) != 0) {
1967 (void)bwrite(bp);
1968 goto bad;
1969 }
1970 /*
1971 * Directory set up, now install its entry in the parent directory.
1972 *
1973 * If we are not doing soft dependencies, then we must write out the
1974 * buffer containing the new directory body before entering the new
1975 * name in the parent. If we are doing soft dependencies, then the
1976 * buffer containing the new directory body will be passed to and
1977 * released in the soft dependency code after the code has attached
1978 * an appropriate ordering dependency to the buffer which ensures that
1979 * the buffer is written before the new name is written in the parent.
1980 */
1981 if (DOINGASYNC(dvp))
1982 bdwrite(bp);
1983 else if (!DOINGSOFTDEP(dvp) && ((error = bwrite(bp))))
1984 goto bad;
1985 ufs_makedirentry(ip, cnp, &newdir);
1986 error = ufs_direnter(dvp, tvp, &newdir, cnp, bp, 0);
1987
1988 bad:
1989 if (error == 0) {
1990 *ap->a_vpp = tvp;
1991 } else {
1992 dp->i_effnlink--;
1993 dp->i_nlink--;
1994 DIP_SET(dp, i_nlink, dp->i_nlink);
1995 dp->i_flag |= IN_CHANGE;
1996 /*
1997 * No need to do an explicit VOP_TRUNCATE here, vrele will
1998 * do this for us because we set the link count to 0.
1999 */
2000 ip->i_effnlink = 0;
2001 ip->i_nlink = 0;
2002 DIP_SET(ip, i_nlink, 0);
2003 ip->i_flag |= IN_CHANGE;
2004 if (DOINGSOFTDEP(tvp))
2005 softdep_revert_mkdir(dp, ip);
2006
2007 vput(tvp);
2008 }
2009 out:
2010 return (error);
2011 }
2012
2013 /*
2014 * Rmdir system call.
2015 */
2016 static int
2017 ufs_rmdir(ap)
2018 struct vop_rmdir_args /* {
2019 struct vnode *a_dvp;
2020 struct vnode *a_vp;
2021 struct componentname *a_cnp;
2022 } */ *ap;
2023 {
2024 struct vnode *vp = ap->a_vp;
2025 struct vnode *dvp = ap->a_dvp;
2026 struct componentname *cnp = ap->a_cnp;
2027 struct inode *ip, *dp;
2028 int error;
2029
2030 ip = VTOI(vp);
2031 dp = VTOI(dvp);
2032
2033 /*
2034 * Do not remove a directory that is in the process of being renamed.
2035 * Verify the directory is empty (and valid). Rmdir ".." will not be
2036 * valid since ".." will contain a reference to the current directory
2037 * and thus be non-empty. Do not allow the removal of mounted on
2038 * directories (this can happen when an NFS exported filesystem
2039 * tries to remove a locally mounted on directory).
2040 */
2041 error = 0;
2042 if (dp->i_effnlink <= 2) {
2043 if (dp->i_effnlink == 2)
2044 print_bad_link_count("ufs_rmdir", dvp);
2045 error = EINVAL;
2046 goto out;
2047 }
2048 if (!ufs_dirempty(ip, dp->i_number, cnp->cn_cred)) {
2049 error = ENOTEMPTY;
2050 goto out;
2051 }
2052 if ((dp->i_flags & APPEND)
2053 || (ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))) {
2054 error = EPERM;
2055 goto out;
2056 }
2057 if (vp->v_mountedhere != 0) {
2058 error = EINVAL;
2059 goto out;
2060 }
2061 #ifdef UFS_GJOURNAL
2062 ufs_gjournal_orphan(vp);
2063 #endif
2064 /*
2065 * Delete reference to directory before purging
2066 * inode. If we crash in between, the directory
2067 * will be reattached to lost+found,
2068 */
2069 dp->i_effnlink--;
2070 ip->i_effnlink--;
2071 if (DOINGSOFTDEP(vp))
2072 softdep_setup_rmdir(dp, ip);
2073 error = ufs_dirremove(dvp, ip, cnp->cn_flags, 1);
2074 if (error) {
2075 dp->i_effnlink++;
2076 ip->i_effnlink++;
2077 if (DOINGSOFTDEP(vp))
2078 softdep_revert_rmdir(dp, ip);
2079 goto out;
2080 }
2081 cache_purge(dvp);
2082 /*
2083 * The only stuff left in the directory is "." and "..". The "."
2084 * reference is inconsequential since we are quashing it. The soft
2085 * dependency code will arrange to do these operations after
2086 * the parent directory entry has been deleted on disk, so
2087 * when running with that code we avoid doing them now.
2088 */
2089 if (!DOINGSOFTDEP(vp)) {
2090 dp->i_nlink--;
2091 DIP_SET(dp, i_nlink, dp->i_nlink);
2092 dp->i_flag |= IN_CHANGE;
2093 error = UFS_UPDATE(dvp, 0);
2094 ip->i_nlink--;
2095 DIP_SET(ip, i_nlink, ip->i_nlink);
2096 ip->i_flag |= IN_CHANGE;
2097 }
2098 cache_purge(vp);
2099 #ifdef UFS_DIRHASH
2100 /* Kill any active hash; i_effnlink == 0, so it will not come back. */
2101 if (ip->i_dirhash != NULL)
2102 ufsdirhash_free(ip);
2103 #endif
2104 out:
2105 return (error);
2106 }
2107
2108 /*
2109 * symlink -- make a symbolic link
2110 */
2111 static int
2112 ufs_symlink(ap)
2113 struct vop_symlink_args /* {
2114 struct vnode *a_dvp;
2115 struct vnode **a_vpp;
2116 struct componentname *a_cnp;
2117 struct vattr *a_vap;
2118 char *a_target;
2119 } */ *ap;
2120 {
2121 struct vnode *vp, **vpp = ap->a_vpp;
2122 struct inode *ip;
2123 int len, error;
2124
2125 error = ufs_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp,
2126 vpp, ap->a_cnp, "ufs_symlink");
2127 if (error)
2128 return (error);
2129 vp = *vpp;
2130 len = strlen(ap->a_target);
2131 if (len < vp->v_mount->mnt_maxsymlinklen) {
2132 ip = VTOI(vp);
2133 bcopy(ap->a_target, SHORTLINK(ip), len);
2134 ip->i_size = len;
2135 DIP_SET(ip, i_size, len);
2136 ip->i_flag |= IN_CHANGE | IN_UPDATE;
2137 error = UFS_UPDATE(vp, 0);
2138 } else
2139 error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0,
2140 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK,
2141 ap->a_cnp->cn_cred, NOCRED, NULL, NULL);
2142 if (error)
2143 vput(vp);
2144 return (error);
2145 }
2146
2147 /*
2148 * Vnode op for reading directories.
2149 */
2150 int
2151 ufs_readdir(ap)
2152 struct vop_readdir_args /* {
2153 struct vnode *a_vp;
2154 struct uio *a_uio;
2155 struct ucred *a_cred;
2156 int *a_eofflag;
2157 int *a_ncookies;
2158 u_long **a_cookies;
2159 } */ *ap;
2160 {
2161 struct vnode *vp = ap->a_vp;
2162 struct uio *uio = ap->a_uio;
2163 struct buf *bp;
2164 struct inode *ip;
2165 struct direct *dp, *edp;
2166 u_long *cookies;
2167 struct dirent dstdp;
2168 off_t offset, startoffset;
2169 size_t readcnt, skipcnt;
2170 ssize_t startresid;
2171 int ncookies;
2172 int error;
2173
2174 if (uio->uio_offset < 0)
2175 return (EINVAL);
2176 ip = VTOI(vp);
2177 if (ip->i_effnlink == 0)
2178 return (0);
2179 if (ap->a_ncookies != NULL) {
2180 ncookies = uio->uio_resid;
2181 if (uio->uio_offset >= ip->i_size)
2182 ncookies = 0;
2183 else if (ip->i_size - uio->uio_offset < ncookies)
2184 ncookies = ip->i_size - uio->uio_offset;
2185 ncookies = ncookies / (offsetof(struct direct, d_name) + 4) + 1;
2186 cookies = malloc(ncookies * sizeof(*cookies), M_TEMP, M_WAITOK);
2187 *ap->a_ncookies = ncookies;
2188 *ap->a_cookies = cookies;
2189 } else {
2190 ncookies = 0;
2191 cookies = NULL;
2192 }
2193 offset = startoffset = uio->uio_offset;
2194 startresid = uio->uio_resid;
2195 error = 0;
2196 while (error == 0 && uio->uio_resid > 0 &&
2197 uio->uio_offset < ip->i_size) {
2198 error = ffs_blkatoff(vp, uio->uio_offset, NULL, &bp);
2199 if (error)
2200 break;
2201 if (bp->b_offset + bp->b_bcount > ip->i_size)
2202 readcnt = ip->i_size - bp->b_offset;
2203 else
2204 readcnt = bp->b_bcount;
2205 skipcnt = (size_t)(uio->uio_offset - bp->b_offset) &
2206 ~(size_t)(DIRBLKSIZ - 1);
2207 offset = bp->b_offset + skipcnt;
2208 dp = (struct direct *)&bp->b_data[skipcnt];
2209 edp = (struct direct *)&bp->b_data[readcnt];
2210 while (error == 0 && uio->uio_resid > 0 && dp < edp) {
2211 if (dp->d_reclen <= offsetof(struct direct, d_name) ||
2212 (caddr_t)dp + dp->d_reclen > (caddr_t)edp) {
2213 error = EIO;
2214 break;
2215 }
2216 #if BYTE_ORDER == LITTLE_ENDIAN
2217 /* Old filesystem format. */
2218 if (vp->v_mount->mnt_maxsymlinklen <= 0) {
2219 dstdp.d_namlen = dp->d_type;
2220 dstdp.d_type = dp->d_namlen;
2221 } else
2222 #endif
2223 {
2224 dstdp.d_namlen = dp->d_namlen;
2225 dstdp.d_type = dp->d_type;
2226 }
2227 if (offsetof(struct direct, d_name) + dstdp.d_namlen >
2228 dp->d_reclen) {
2229 error = EIO;
2230 break;
2231 }
2232 if (offset < startoffset || dp->d_ino == 0)
2233 goto nextentry;
2234 dstdp.d_fileno = dp->d_ino;
2235 dstdp.d_reclen = GENERIC_DIRSIZ(&dstdp);
2236 bcopy(dp->d_name, dstdp.d_name, dstdp.d_namlen);
2237 dstdp.d_name[dstdp.d_namlen] = '\0';
2238 if (dstdp.d_reclen > uio->uio_resid) {
2239 if (uio->uio_resid == startresid)
2240 error = EINVAL;
2241 else
2242 error = EJUSTRETURN;
2243 break;
2244 }
2245 /* Advance dp. */
2246 error = uiomove((caddr_t)&dstdp, dstdp.d_reclen, uio);
2247 if (error)
2248 break;
2249 if (cookies != NULL) {
2250 KASSERT(ncookies > 0,
2251 ("ufs_readdir: cookies buffer too small"));
2252 *cookies = offset + dp->d_reclen;
2253 cookies++;
2254 ncookies--;
2255 }
2256 nextentry:
2257 offset += dp->d_reclen;
2258 dp = (struct direct *)((caddr_t)dp + dp->d_reclen);
2259 }
2260 bqrelse(bp);
2261 uio->uio_offset = offset;
2262 }
2263 /* We need to correct uio_offset. */
2264 uio->uio_offset = offset;
2265 if (error == EJUSTRETURN)
2266 error = 0;
2267 if (ap->a_ncookies != NULL) {
2268 if (error == 0) {
2269 ap->a_ncookies -= ncookies;
2270 } else {
2271 free(*ap->a_cookies, M_TEMP);
2272 *ap->a_ncookies = 0;
2273 *ap->a_cookies = NULL;
2274 }
2275 }
2276 if (error == 0 && ap->a_eofflag)
2277 *ap->a_eofflag = ip->i_size <= uio->uio_offset;
2278 return (error);
2279 }
2280
2281 /*
2282 * Return target name of a symbolic link
2283 */
2284 static int
2285 ufs_readlink(ap)
2286 struct vop_readlink_args /* {
2287 struct vnode *a_vp;
2288 struct uio *a_uio;
2289 struct ucred *a_cred;
2290 } */ *ap;
2291 {
2292 struct vnode *vp = ap->a_vp;
2293 struct inode *ip = VTOI(vp);
2294 doff_t isize;
2295
2296 isize = ip->i_size;
2297 if ((isize < vp->v_mount->mnt_maxsymlinklen) ||
2298 DIP(ip, i_blocks) == 0) { /* XXX - for old fastlink support */
2299 return (uiomove(SHORTLINK(ip), isize, ap->a_uio));
2300 }
2301 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred));
2302 }
2303
2304 /*
2305 * Calculate the logical to physical mapping if not done already,
2306 * then call the device strategy routine.
2307 *
2308 * In order to be able to swap to a file, the ufs_bmaparray() operation may not
2309 * deadlock on memory. See ufs_bmap() for details.
2310 */
2311 static int
2312 ufs_strategy(ap)
2313 struct vop_strategy_args /* {
2314 struct vnode *a_vp;
2315 struct buf *a_bp;
2316 } */ *ap;
2317 {
2318 struct buf *bp = ap->a_bp;
2319 struct vnode *vp = ap->a_vp;
2320 ufs2_daddr_t blkno;
2321 int error;
2322
2323 if (bp->b_blkno == bp->b_lblkno) {
2324 error = ufs_bmaparray(vp, bp->b_lblkno, &blkno, bp, NULL, NULL);
2325 bp->b_blkno = blkno;
2326 if (error) {
2327 bp->b_error = error;
2328 bp->b_ioflags |= BIO_ERROR;
2329 bufdone(bp);
2330 return (0);
2331 }
2332 if ((long)bp->b_blkno == -1)
2333 vfs_bio_clrbuf(bp);
2334 }
2335 if ((long)bp->b_blkno == -1) {
2336 bufdone(bp);
2337 return (0);
2338 }
2339 bp->b_iooffset = dbtob(bp->b_blkno);
2340 BO_STRATEGY(VFSTOUFS(vp->v_mount)->um_bo, bp);
2341 return (0);
2342 }
2343
2344 /*
2345 * Print out the contents of an inode.
2346 */
2347 static int
2348 ufs_print(ap)
2349 struct vop_print_args /* {
2350 struct vnode *a_vp;
2351 } */ *ap;
2352 {
2353 struct vnode *vp = ap->a_vp;
2354 struct inode *ip = VTOI(vp);
2355
2356 printf("\tino %lu, on dev %s", (u_long)ip->i_number,
2357 devtoname(ITODEV(ip)));
2358 if (vp->v_type == VFIFO)
2359 fifo_printinfo(vp);
2360 printf("\n");
2361 return (0);
2362 }
2363
2364 /*
2365 * Close wrapper for fifos.
2366 *
2367 * Update the times on the inode then do device close.
2368 */
2369 static int
2370 ufsfifo_close(ap)
2371 struct vop_close_args /* {
2372 struct vnode *a_vp;
2373 int a_fflag;
2374 struct ucred *a_cred;
2375 struct thread *a_td;
2376 } */ *ap;
2377 {
2378 struct vnode *vp = ap->a_vp;
2379 int usecount;
2380
2381 VI_LOCK(vp);
2382 usecount = vp->v_usecount;
2383 if (usecount > 1)
2384 ufs_itimes_locked(vp);
2385 VI_UNLOCK(vp);
2386 return (fifo_specops.vop_close(ap));
2387 }
2388
2389 /*
2390 * Kqfilter wrapper for fifos.
2391 *
2392 * Fall through to ufs kqfilter routines if needed
2393 */
2394 static int
2395 ufsfifo_kqfilter(ap)
2396 struct vop_kqfilter_args *ap;
2397 {
2398 int error;
2399
2400 error = fifo_specops.vop_kqfilter(ap);
2401 if (error)
2402 error = vfs_kqfilter(ap);
2403 return (error);
2404 }
2405
2406 /*
2407 * Return POSIX pathconf information applicable to fifos.
2408 */
2409 static int
2410 ufsfifo_pathconf(ap)
2411 struct vop_pathconf_args /* {
2412 struct vnode *a_vp;
2413 int a_name;
2414 int *a_retval;
2415 } */ *ap;
2416 {
2417
2418 switch (ap->a_name) {
2419 case _PC_ACL_EXTENDED:
2420 case _PC_ACL_NFS4:
2421 case _PC_ACL_PATH_MAX:
2422 case _PC_MAC_PRESENT:
2423 return (ufs_pathconf(ap));
2424 default:
2425 return (fifo_specops.vop_pathconf(ap));
2426 }
2427 /* NOTREACHED */
2428 }
2429
2430 /*
2431 * Return POSIX pathconf information applicable to ufs filesystems.
2432 */
2433 static int
2434 ufs_pathconf(ap)
2435 struct vop_pathconf_args /* {
2436 struct vnode *a_vp;
2437 int a_name;
2438 int *a_retval;
2439 } */ *ap;
2440 {
2441 int error;
2442
2443 error = 0;
2444 switch (ap->a_name) {
2445 case _PC_LINK_MAX:
2446 *ap->a_retval = LINK_MAX;
2447 break;
2448 case _PC_NAME_MAX:
2449 *ap->a_retval = NAME_MAX;
2450 break;
2451 case _PC_PATH_MAX:
2452 *ap->a_retval = PATH_MAX;
2453 break;
2454 case _PC_PIPE_BUF:
2455 *ap->a_retval = PIPE_BUF;
2456 break;
2457 case _PC_CHOWN_RESTRICTED:
2458 *ap->a_retval = 1;
2459 break;
2460 case _PC_NO_TRUNC:
2461 *ap->a_retval = 1;
2462 break;
2463 case _PC_ACL_EXTENDED:
2464 #ifdef UFS_ACL
2465 if (ap->a_vp->v_mount->mnt_flag & MNT_ACLS)
2466 *ap->a_retval = 1;
2467 else
2468 *ap->a_retval = 0;
2469 #else
2470 *ap->a_retval = 0;
2471 #endif
2472 break;
2473
2474 case _PC_ACL_NFS4:
2475 #ifdef UFS_ACL
2476 if (ap->a_vp->v_mount->mnt_flag & MNT_NFS4ACLS)
2477 *ap->a_retval = 1;
2478 else
2479 *ap->a_retval = 0;
2480 #else
2481 *ap->a_retval = 0;
2482 #endif
2483 break;
2484
2485 case _PC_ACL_PATH_MAX:
2486 #ifdef UFS_ACL
2487 if (ap->a_vp->v_mount->mnt_flag & (MNT_ACLS | MNT_NFS4ACLS))
2488 *ap->a_retval = ACL_MAX_ENTRIES;
2489 else
2490 *ap->a_retval = 3;
2491 #else
2492 *ap->a_retval = 3;
2493 #endif
2494 break;
2495 case _PC_MAC_PRESENT:
2496 #ifdef MAC
2497 if (ap->a_vp->v_mount->mnt_flag & MNT_MULTILABEL)
2498 *ap->a_retval = 1;
2499 else
2500 *ap->a_retval = 0;
2501 #else
2502 *ap->a_retval = 0;
2503 #endif
2504 break;
2505 case _PC_MIN_HOLE_SIZE:
2506 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
2507 break;
2508 case _PC_ASYNC_IO:
2509 /* _PC_ASYNC_IO should have been handled by upper layers. */
2510 KASSERT(0, ("_PC_ASYNC_IO should not get here"));
2511 error = EINVAL;
2512 break;
2513 case _PC_PRIO_IO:
2514 *ap->a_retval = 0;
2515 break;
2516 case _PC_SYNC_IO:
2517 *ap->a_retval = 0;
2518 break;
2519 case _PC_ALLOC_SIZE_MIN:
2520 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_bsize;
2521 break;
2522 case _PC_FILESIZEBITS:
2523 *ap->a_retval = 64;
2524 break;
2525 case _PC_REC_INCR_XFER_SIZE:
2526 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
2527 break;
2528 case _PC_REC_MAX_XFER_SIZE:
2529 *ap->a_retval = -1; /* means ``unlimited'' */
2530 break;
2531 case _PC_REC_MIN_XFER_SIZE:
2532 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
2533 break;
2534 case _PC_REC_XFER_ALIGN:
2535 *ap->a_retval = PAGE_SIZE;
2536 break;
2537 case _PC_SYMLINK_MAX:
2538 *ap->a_retval = MAXPATHLEN;
2539 break;
2540
2541 default:
2542 error = EINVAL;
2543 break;
2544 }
2545 return (error);
2546 }
2547
2548 /*
2549 * Initialize the vnode associated with a new inode, handle aliased
2550 * vnodes.
2551 */
2552 int
2553 ufs_vinit(mntp, fifoops, vpp)
2554 struct mount *mntp;
2555 struct vop_vector *fifoops;
2556 struct vnode **vpp;
2557 {
2558 struct inode *ip;
2559 struct vnode *vp;
2560
2561 vp = *vpp;
2562 ip = VTOI(vp);
2563 vp->v_type = IFTOVT(ip->i_mode);
2564 if (vp->v_type == VFIFO)
2565 vp->v_op = fifoops;
2566 ASSERT_VOP_LOCKED(vp, "ufs_vinit");
2567 if (ip->i_number == ROOTINO)
2568 vp->v_vflag |= VV_ROOT;
2569 *vpp = vp;
2570 return (0);
2571 }
2572
2573 /*
2574 * Allocate a new inode.
2575 * Vnode dvp must be locked.
2576 */
2577 static int
2578 ufs_makeinode(mode, dvp, vpp, cnp, callfunc)
2579 int mode;
2580 struct vnode *dvp;
2581 struct vnode **vpp;
2582 struct componentname *cnp;
2583 const char *callfunc;
2584 {
2585 struct inode *ip, *pdir;
2586 struct direct newdir;
2587 struct vnode *tvp;
2588 int error;
2589
2590 pdir = VTOI(dvp);
2591 #ifdef INVARIANTS
2592 if ((cnp->cn_flags & HASBUF) == 0)
2593 panic("%s: no name", callfunc);
2594 #endif
2595 *vpp = NULL;
2596 if ((mode & IFMT) == 0)
2597 mode |= IFREG;
2598
2599 if (pdir->i_effnlink < 2) {
2600 print_bad_link_count(callfunc, dvp);
2601 return (EINVAL);
2602 }
2603 error = UFS_VALLOC(dvp, mode, cnp->cn_cred, &tvp);
2604 if (error)
2605 return (error);
2606 ip = VTOI(tvp);
2607 ip->i_gid = pdir->i_gid;
2608 DIP_SET(ip, i_gid, pdir->i_gid);
2609 #ifdef SUIDDIR
2610 {
2611 #ifdef QUOTA
2612 struct ucred ucred, *ucp;
2613 gid_t ucred_group;
2614 ucp = cnp->cn_cred;
2615 #endif
2616 /*
2617 * If we are not the owner of the directory,
2618 * and we are hacking owners here, (only do this where told to)
2619 * and we are not giving it TO root, (would subvert quotas)
2620 * then go ahead and give it to the other user.
2621 * Note that this drops off the execute bits for security.
2622 */
2623 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) &&
2624 (pdir->i_mode & ISUID) &&
2625 (pdir->i_uid != cnp->cn_cred->cr_uid) && pdir->i_uid) {
2626 ip->i_uid = pdir->i_uid;
2627 DIP_SET(ip, i_uid, ip->i_uid);
2628 mode &= ~07111;
2629 #ifdef QUOTA
2630 /*
2631 * Make sure the correct user gets charged
2632 * for the space.
2633 * Quickly knock up a dummy credential for the victim.
2634 * XXX This seems to never be accessed out of our
2635 * context so a stack variable is ok.
2636 */
2637 refcount_init(&ucred.cr_ref, 1);
2638 ucred.cr_uid = ip->i_uid;
2639 ucred.cr_ngroups = 1;
2640 ucred.cr_groups = &ucred_group;
2641 ucred.cr_groups[0] = pdir->i_gid;
2642 ucp = &ucred;
2643 #endif
2644 } else {
2645 ip->i_uid = cnp->cn_cred->cr_uid;
2646 DIP_SET(ip, i_uid, ip->i_uid);
2647 }
2648
2649 #ifdef QUOTA
2650 if ((error = getinoquota(ip)) ||
2651 (error = chkiq(ip, 1, ucp, 0))) {
2652 if (DOINGSOFTDEP(tvp))
2653 softdep_revert_link(pdir, ip);
2654 UFS_VFREE(tvp, ip->i_number, mode);
2655 vput(tvp);
2656 return (error);
2657 }
2658 #endif
2659 }
2660 #else /* !SUIDDIR */
2661 ip->i_uid = cnp->cn_cred->cr_uid;
2662 DIP_SET(ip, i_uid, ip->i_uid);
2663 #ifdef QUOTA
2664 if ((error = getinoquota(ip)) ||
2665 (error = chkiq(ip, 1, cnp->cn_cred, 0))) {
2666 if (DOINGSOFTDEP(tvp))
2667 softdep_revert_link(pdir, ip);
2668 UFS_VFREE(tvp, ip->i_number, mode);
2669 vput(tvp);
2670 return (error);
2671 }
2672 #endif
2673 #endif /* !SUIDDIR */
2674 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
2675 ip->i_mode = mode;
2676 DIP_SET(ip, i_mode, mode);
2677 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */
2678 ip->i_effnlink = 1;
2679 ip->i_nlink = 1;
2680 DIP_SET(ip, i_nlink, 1);
2681 if (DOINGSOFTDEP(tvp))
2682 softdep_setup_create(VTOI(dvp), ip);
2683 if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred) &&
2684 priv_check_cred(cnp->cn_cred, PRIV_VFS_SETGID, 0)) {
2685 ip->i_mode &= ~ISGID;
2686 DIP_SET(ip, i_mode, ip->i_mode);
2687 }
2688
2689 if (cnp->cn_flags & ISWHITEOUT) {
2690 ip->i_flags |= UF_OPAQUE;
2691 DIP_SET(ip, i_flags, ip->i_flags);
2692 }
2693
2694 /*
2695 * Make sure inode goes to disk before directory entry.
2696 */
2697 error = UFS_UPDATE(tvp, !(DOINGSOFTDEP(tvp) | DOINGASYNC(tvp)));
2698 if (error)
2699 goto bad;
2700 #ifdef MAC
2701 if (dvp->v_mount->mnt_flag & MNT_MULTILABEL) {
2702 error = mac_vnode_create_extattr(cnp->cn_cred, dvp->v_mount,
2703 dvp, tvp, cnp);
2704 if (error)
2705 goto bad;
2706 }
2707 #endif
2708 #ifdef UFS_ACL
2709 if (dvp->v_mount->mnt_flag & MNT_ACLS) {
2710 error = ufs_do_posix1e_acl_inheritance_file(dvp, tvp, mode,
2711 cnp->cn_cred, cnp->cn_thread);
2712 if (error)
2713 goto bad;
2714 } else if (dvp->v_mount->mnt_flag & MNT_NFS4ACLS) {
2715 error = ufs_do_nfs4_acl_inheritance(dvp, tvp, mode,
2716 cnp->cn_cred, cnp->cn_thread);
2717 if (error)
2718 goto bad;
2719 }
2720 #endif /* !UFS_ACL */
2721 ufs_makedirentry(ip, cnp, &newdir);
2722 error = ufs_direnter(dvp, tvp, &newdir, cnp, NULL, 0);
2723 if (error)
2724 goto bad;
2725 *vpp = tvp;
2726 return (0);
2727
2728 bad:
2729 /*
2730 * Write error occurred trying to update the inode
2731 * or the directory so must deallocate the inode.
2732 */
2733 ip->i_effnlink = 0;
2734 ip->i_nlink = 0;
2735 DIP_SET(ip, i_nlink, 0);
2736 ip->i_flag |= IN_CHANGE;
2737 if (DOINGSOFTDEP(tvp))
2738 softdep_revert_create(VTOI(dvp), ip);
2739 vput(tvp);
2740 return (error);
2741 }
2742
2743 static int
2744 ufs_ioctl(struct vop_ioctl_args *ap)
2745 {
2746
2747 switch (ap->a_command) {
2748 case FIOSEEKDATA:
2749 case FIOSEEKHOLE:
2750 return (vn_bmap_seekhole(ap->a_vp, ap->a_command,
2751 (off_t *)ap->a_data, ap->a_cred));
2752 default:
2753 return (ENOTTY);
2754 }
2755 }
2756
2757 /* Global vfs data structures for ufs. */
2758 struct vop_vector ufs_vnodeops = {
2759 .vop_default = &default_vnodeops,
2760 .vop_fsync = VOP_PANIC,
2761 .vop_read = VOP_PANIC,
2762 .vop_reallocblks = VOP_PANIC,
2763 .vop_write = VOP_PANIC,
2764 .vop_accessx = ufs_accessx,
2765 .vop_bmap = ufs_bmap,
2766 .vop_cachedlookup = ufs_lookup,
2767 .vop_close = ufs_close,
2768 .vop_create = ufs_create,
2769 .vop_getattr = ufs_getattr,
2770 .vop_inactive = ufs_inactive,
2771 .vop_ioctl = ufs_ioctl,
2772 .vop_link = ufs_link,
2773 .vop_lookup = vfs_cache_lookup,
2774 .vop_markatime = ufs_markatime,
2775 .vop_mkdir = ufs_mkdir,
2776 .vop_mknod = ufs_mknod,
2777 .vop_open = ufs_open,
2778 .vop_pathconf = ufs_pathconf,
2779 .vop_poll = vop_stdpoll,
2780 .vop_print = ufs_print,
2781 .vop_readdir = ufs_readdir,
2782 .vop_readlink = ufs_readlink,
2783 .vop_reclaim = ufs_reclaim,
2784 .vop_remove = ufs_remove,
2785 .vop_rename = ufs_rename,
2786 .vop_rmdir = ufs_rmdir,
2787 .vop_setattr = ufs_setattr,
2788 #ifdef MAC
2789 .vop_setlabel = vop_stdsetlabel_ea,
2790 #endif
2791 .vop_strategy = ufs_strategy,
2792 .vop_symlink = ufs_symlink,
2793 .vop_whiteout = ufs_whiteout,
2794 #ifdef UFS_EXTATTR
2795 .vop_getextattr = ufs_getextattr,
2796 .vop_deleteextattr = ufs_deleteextattr,
2797 .vop_setextattr = ufs_setextattr,
2798 #endif
2799 #ifdef UFS_ACL
2800 .vop_getacl = ufs_getacl,
2801 .vop_setacl = ufs_setacl,
2802 .vop_aclcheck = ufs_aclcheck,
2803 #endif
2804 };
2805
2806 struct vop_vector ufs_fifoops = {
2807 .vop_default = &fifo_specops,
2808 .vop_fsync = VOP_PANIC,
2809 .vop_accessx = ufs_accessx,
2810 .vop_close = ufsfifo_close,
2811 .vop_getattr = ufs_getattr,
2812 .vop_inactive = ufs_inactive,
2813 .vop_kqfilter = ufsfifo_kqfilter,
2814 .vop_markatime = ufs_markatime,
2815 .vop_pathconf = ufsfifo_pathconf,
2816 .vop_print = ufs_print,
2817 .vop_read = VOP_PANIC,
2818 .vop_reclaim = ufs_reclaim,
2819 .vop_setattr = ufs_setattr,
2820 #ifdef MAC
2821 .vop_setlabel = vop_stdsetlabel_ea,
2822 #endif
2823 .vop_write = VOP_PANIC,
2824 #ifdef UFS_EXTATTR
2825 .vop_getextattr = ufs_getextattr,
2826 .vop_deleteextattr = ufs_deleteextattr,
2827 .vop_setextattr = ufs_setextattr,
2828 #endif
2829 #ifdef UFS_ACL
2830 .vop_getacl = ufs_getacl,
2831 .vop_setacl = ufs_setacl,
2832 .vop_aclcheck = ufs_aclcheck,
2833 #endif
2834 };
Cache object: 6317402b8ee387cc8f7f712202bcbf39
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