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MFC r1.3 r1.13 r1.8 (HEAD):
[dragonfly.git] / sys / vfs / ufs / ufs_vnops.c
blob7b70e030bea860c27ef973cb699fa0a04b1c99ff
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 * 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 * @(#)ufs_vnops.c 8.27 (Berkeley) 5/27/95
39 * $FreeBSD: src/sys/ufs/ufs/ufs_vnops.c,v 1.131.2.8 2003/01/02 17:26:19 bde Exp $
40 * $DragonFly: src/sys/vfs/ufs/ufs_vnops.c,v 1.66 2008/06/26 18:53:14 dillon Exp $
41 */
42
43 #include "opt_quota.h"
44 #include "opt_suiddir.h"
45 #include "opt_ufs.h"
46
47 #include <sys/param.h>
48 #include <sys/systm.h>
49 #include <sys/kernel.h>
50 #include <sys/fcntl.h>
51 #include <sys/stat.h>
52 #include <sys/buf.h>
53 #include <sys/proc.h>
54 #include <sys/namei.h>
55 #include <sys/mount.h>
56 #include <sys/unistd.h>
57 #include <sys/vnode.h>
58 #include <sys/malloc.h>
59 #include <sys/dirent.h>
60 #include <sys/lockf.h>
61 #include <sys/event.h>
62 #include <sys/conf.h>
63
64 #include <sys/file.h> /* XXX */
65 #include <sys/jail.h>
66
67 #include <vm/vm.h>
68 #include <vm/vm_extern.h>
69
70 #include <vfs/fifofs/fifo.h>
71
72 #include "quota.h"
73 #include "inode.h"
74 #include "dir.h"
75 #include "ufsmount.h"
76 #include "ufs_extern.h"
77 #include "ffs_extern.h"
78 #ifdef UFS_DIRHASH
79 #include "dirhash.h"
80 #endif
81
82 static int ufs_access (struct vop_access_args *);
83 static int ufs_advlock (struct vop_advlock_args *);
84 static int ufs_chmod (struct vnode *, int, struct ucred *);
85 static int ufs_chown (struct vnode *, uid_t, gid_t, struct ucred *);
86 static int ufs_close (struct vop_close_args *);
87 static int ufs_create (struct vop_old_create_args *);
88 static int ufs_getattr (struct vop_getattr_args *);
89 static int ufs_link (struct vop_old_link_args *);
90 static int ufs_makeinode (int mode, struct vnode *, struct vnode **, struct componentname *);
91 static int ufs_missingop (struct vop_generic_args *ap);
92 static int ufs_mkdir (struct vop_old_mkdir_args *);
93 static int ufs_mknod (struct vop_old_mknod_args *);
94 static int ufs_mmap (struct vop_mmap_args *);
95 static int ufs_open (struct vop_open_args *);
96 static int ufs_pathconf (struct vop_pathconf_args *);
97 static int ufs_print (struct vop_print_args *);
98 static int ufs_readdir (struct vop_readdir_args *);
99 static int ufs_readlink (struct vop_readlink_args *);
100 static int ufs_remove (struct vop_old_remove_args *);
101 static int ufs_rename (struct vop_old_rename_args *);
102 static int ufs_rmdir (struct vop_old_rmdir_args *);
103 static int ufs_setattr (struct vop_setattr_args *);
104 static int ufs_strategy (struct vop_strategy_args *);
105 static int ufs_symlink (struct vop_old_symlink_args *);
106 static int ufs_whiteout (struct vop_old_whiteout_args *);
107 static int ufsfifo_close (struct vop_close_args *);
108 static int ufsfifo_kqfilter (struct vop_kqfilter_args *);
109 static int ufsfifo_read (struct vop_read_args *);
110 static int ufsfifo_write (struct vop_write_args *);
111 static int ufsspec_close (struct vop_close_args *);
112 static int ufsspec_read (struct vop_read_args *);
113 static int ufsspec_write (struct vop_write_args *);
114 static int filt_ufsread (struct knote *kn, long hint);
115 static int filt_ufswrite (struct knote *kn, long hint);
116 static int filt_ufsvnode (struct knote *kn, long hint);
117 static void filt_ufsdetach (struct knote *kn);
118 static int ufs_kqfilter (struct vop_kqfilter_args *ap);
119
120 union _qcvt {
121 int64_t qcvt;
122 int32_t val[2];
123 };
124 #define SETHIGH(q, h) { \
125 union _qcvt tmp; \
126 tmp.qcvt = (q); \
127 tmp.val[_QUAD_HIGHWORD] = (h); \
128 (q) = tmp.qcvt; \
129 }
130 #define SETLOW(q, l) { \
131 union _qcvt tmp; \
132 tmp.qcvt = (q); \
133 tmp.val[_QUAD_LOWWORD] = (l); \
134 (q) = tmp.qcvt; \
135 }
136 #define VN_KNOTE(vp, b) \
137 KNOTE(&vp->v_pollinfo.vpi_selinfo.si_note, (b))
138
139 #define OFSFMT(vp) ((vp)->v_mount->mnt_maxsymlinklen <= 0)
140
141 /*
142 * A virgin directory (no blushing please).
143 */
144 static struct dirtemplate mastertemplate = {
145 0, 12, DT_DIR, 1, ".",
146 0, DIRBLKSIZ - 12, DT_DIR, 2, ".."
147 };
148 static struct odirtemplate omastertemplate = {
149 0, 12, 1, ".",
150 0, DIRBLKSIZ - 12, 2, ".."
151 };
152
153 void
154 ufs_itimes(struct vnode *vp)
155 {
156 struct inode *ip;
157 struct timespec ts;
158
159 ip = VTOI(vp);
160 if ((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE)) == 0)
161 return;
162 if ((vp->v_type == VBLK || vp->v_type == VCHR) && !DOINGSOFTDEP(vp))
163 ip->i_flag |= IN_LAZYMOD;
164 else
165 ip->i_flag |= IN_MODIFIED;
166 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
167 vfs_timestamp(&ts);
168 if (ip->i_flag & IN_ACCESS) {
169 ip->i_atime = ts.tv_sec;
170 ip->i_atimensec = ts.tv_nsec;
171 }
172 if (ip->i_flag & IN_UPDATE) {
173 ip->i_mtime = ts.tv_sec;
174 ip->i_mtimensec = ts.tv_nsec;
175 ip->i_modrev++;
176 }
177 if (ip->i_flag & IN_CHANGE) {
178 ip->i_ctime = ts.tv_sec;
179 ip->i_ctimensec = ts.tv_nsec;
180 }
181 }
182 ip->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE);
183 }
184
185 /*
186 * Create a regular file
187 *
188 * ufs_create(struct vnode *a_dvp, struct vnode **a_vpp,
189 * struct componentname *a_cnp, struct vattr *a_vap)
190 */
191 static
192 int
193 ufs_create(struct vop_old_create_args *ap)
194 {
195 int error;
196
197 error =
198 ufs_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode),
199 ap->a_dvp, ap->a_vpp, ap->a_cnp);
200 if (error)
201 return (error);
202 VN_KNOTE(ap->a_dvp, NOTE_WRITE);
203 return (0);
204 }
205
206 /*
207 * Mknod vnode call
208 *
209 * ufs_mknod(struct vnode *a_dvp, struct vnode **a_vpp,
210 * struct componentname *a_cnp, struct vattr *a_vap)
211 */
212 /* ARGSUSED */
213 static
214 int
215 ufs_mknod(struct vop_old_mknod_args *ap)
216 {
217 struct vattr *vap = ap->a_vap;
218 struct vnode **vpp = ap->a_vpp;
219 struct inode *ip;
220 ino_t ino;
221 int error;
222
223 /*
224 * UFS cannot represent the entire major/minor range supported by
225 * the kernel.
226 */
227 if (vap->va_rmajor != VNOVAL &&
228 makeudev(vap->va_rmajor, vap->va_rminor) == NOUDEV) {
229 return(EINVAL);
230 }
231
232 /* no special directory support */
233 if (vap->va_type == VDIR)
234 return(EINVAL);
235
236 error = ufs_makeinode(MAKEIMODE(vap->va_type, vap->va_mode),
237 ap->a_dvp, vpp, ap->a_cnp);
238 if (error)
239 return (error);
240 VN_KNOTE(ap->a_dvp, NOTE_WRITE);
241 ip = VTOI(*vpp);
242 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
243 if (vap->va_rmajor != VNOVAL) {
244 /*
245 * Want to be able to use this to make badblock
246 * inodes, so don't truncate the dev number.
247 */
248 ip->i_rdev = makeudev(vap->va_rmajor, vap->va_rminor);
249 }
250 /*
251 * Remove inode, then reload it through VFS_VGET so it is
252 * checked to see if it is an alias of an existing entry in
253 * the inode cache.
254 */
255 (*vpp)->v_type = VNON;
256 ino = ip->i_number; /* Save this before vgone() invalidates ip. */
257 vgone_vxlocked(*vpp);
258 vput(*vpp);
259 error = VFS_VGET(ap->a_dvp->v_mount, ino, vpp);
260 if (error) {
261 *vpp = NULL;
262 return (error);
263 }
264 return (0);
265 }
266
267 /*
268 * Open called.
269 *
270 * Nothing to do.
271 *
272 * ufs_open(struct vnode *a_vp, int a_mode, struct ucred *a_cred,
273 * struct file *a_fp)
274 */
275 /* ARGSUSED */
276 static
277 int
278 ufs_open(struct vop_open_args *ap)
279 {
280 struct vnode *vp = ap->a_vp;
281
282 /*
283 * Files marked append-only must be opened for appending.
284 */
285 if ((VTOI(vp)->i_flags & APPEND) &&
286 (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE) {
287 return (EPERM);
288 }
289
290 return (vop_stdopen(ap));
291 }
292
293 /*
294 * Close called.
295 *
296 * Update the times on the inode.
297 *
298 * ufs_close(struct vnode *a_vp, int a_fflag)
299 */
300 /* ARGSUSED */
301 static
302 int
303 ufs_close(struct vop_close_args *ap)
304 {
305 struct vnode *vp = ap->a_vp;
306
307 if (vp->v_sysref.refcnt > 1)
308 ufs_itimes(vp);
309 return (vop_stdclose(ap));
310 }
311
312 /*
313 * ufs_access(struct vnode *a_vp, int a_mode, struct ucred *a_cred)
314 */
315 static
316 int
317 ufs_access(struct vop_access_args *ap)
318 {
319 struct vnode *vp = ap->a_vp;
320 struct inode *ip = VTOI(vp);
321 struct ucred *cred = ap->a_cred;
322 mode_t mask, mode = ap->a_mode;
323 gid_t *gp;
324 int i;
325 #ifdef QUOTA
326 int error;
327 #endif
328
329 /*
330 * Disallow write attempts on read-only filesystems;
331 * unless the file is a socket, fifo, or a block or
332 * character device resident on the filesystem.
333 */
334 if (mode & VWRITE) {
335 switch (vp->v_type) {
336 case VDIR:
337 case VLNK:
338 case VREG:
339 if (vp->v_mount->mnt_flag & MNT_RDONLY)
340 return (EROFS);
341 #ifdef QUOTA
342 if ((error = ufs_getinoquota(ip)) != 0)
343 return (error);
344 #endif
345 break;
346 default:
347 break;
348 }
349 }
350
351 /* If immutable bit set, nobody gets to write it. */
352 if ((mode & VWRITE) && (ip->i_flags & IMMUTABLE))
353 return (EPERM);
354
355 /* Otherwise, user id 0 always gets access. */
356 if (cred->cr_uid == 0)
357 return (0);
358
359 mask = 0;
360
361 /* Otherwise, check the owner. */
362 if (cred->cr_uid == ip->i_uid) {
363 if (mode & VEXEC)
364 mask |= S_IXUSR;
365 if (mode & VREAD)
366 mask |= S_IRUSR;
367 if (mode & VWRITE)
368 mask |= S_IWUSR;
369 return ((ip->i_mode & mask) == mask ? 0 : EACCES);
370 }
371
372 /* Otherwise, check the groups. */
373 for (i = 0, gp = cred->cr_groups; i < cred->cr_ngroups; i++, gp++)
374 if (ip->i_gid == *gp) {
375 if (mode & VEXEC)
376 mask |= S_IXGRP;
377 if (mode & VREAD)
378 mask |= S_IRGRP;
379 if (mode & VWRITE)
380 mask |= S_IWGRP;
381 return ((ip->i_mode & mask) == mask ? 0 : EACCES);
382 }
383
384 /* Otherwise, check everyone else. */
385 if (mode & VEXEC)
386 mask |= S_IXOTH;
387 if (mode & VREAD)
388 mask |= S_IROTH;
389 if (mode & VWRITE)
390 mask |= S_IWOTH;
391 return ((ip->i_mode & mask) == mask ? 0 : EACCES);
392 }
393
394 /*
395 * ufs_getattr(struct vnode *a_vp, struct vattr *a_vap)
396 */
397 /* ARGSUSED */
398 static
399 int
400 ufs_getattr(struct vop_getattr_args *ap)
401 {
402 struct vnode *vp = ap->a_vp;
403 struct inode *ip = VTOI(vp);
404 struct vattr *vap = ap->a_vap;
405
406 /*
407 * This may cause i_fsmid to be updated even if no change (0)
408 * is returned, but we should only write out the inode if non-zero
409 * is returned and if the mount is read-write.
410 */
411 if (cache_check_fsmid_vp(vp, &ip->i_fsmid) &&
412 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0
413 ) {
414 ip->i_flag |= IN_LAZYMOD;
415 }
416
417 ufs_itimes(vp);
418 /*
419 * Copy from inode table
420 */
421 vap->va_fsid = dev2udev(ip->i_dev);
422 vap->va_fileid = ip->i_number;
423 vap->va_mode = ip->i_mode & ~IFMT;
424 vap->va_nlink = VFSTOUFS(vp->v_mount)->um_i_effnlink_valid ?
425 ip->i_effnlink : ip->i_nlink;
426 vap->va_uid = ip->i_uid;
427 vap->va_gid = ip->i_gid;
428 vap->va_rmajor = umajor(ip->i_rdev);
429 vap->va_rminor = uminor(ip->i_rdev);
430 vap->va_size = ip->i_din.di_size;
431 vap->va_atime.tv_sec = ip->i_atime;
432 vap->va_atime.tv_nsec = ip->i_atimensec;
433 vap->va_mtime.tv_sec = ip->i_mtime;
434 vap->va_mtime.tv_nsec = ip->i_mtimensec;
435 vap->va_ctime.tv_sec = ip->i_ctime;
436 vap->va_ctime.tv_nsec = ip->i_ctimensec;
437 vap->va_flags = ip->i_flags;
438 vap->va_gen = ip->i_gen;
439 vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize;
440 vap->va_bytes = dbtob((u_quad_t)ip->i_blocks);
441 vap->va_type = IFTOVT(ip->i_mode);
442 vap->va_filerev = ip->i_modrev;
443 vap->va_fsmid = ip->i_fsmid;
444 return (0);
445 }
446
447 /*
448 * Set attribute vnode op. called from several syscalls
449 *
450 * ufs_setattr(struct vnode *a_vp, struct vattr *a_vap,
451 * struct ucred *a_cred)
452 */
453 static
454 int
455 ufs_setattr(struct vop_setattr_args *ap)
456 {
457 struct vattr *vap = ap->a_vap;
458 struct vnode *vp = ap->a_vp;
459 struct inode *ip = VTOI(vp);
460 struct ucred *cred = ap->a_cred;
461 int error;
462
463 /*
464 * Check for unsettable attributes.
465 */
466 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
467 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
468 (vap->va_blocksize != VNOVAL) || (vap->va_rmajor != VNOVAL) ||
469 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
470 return (EINVAL);
471 }
472 if (vap->va_flags != VNOVAL) {
473 if (vp->v_mount->mnt_flag & MNT_RDONLY)
474 return (EROFS);
475 if (cred->cr_uid != ip->i_uid &&
476 (error = suser_cred(cred, PRISON_ROOT)))
477 return (error);
478 /*
479 * Note that a root chflags becomes a user chflags when
480 * we are jailed, unless the jail.chflags_allowed sysctl
481 * is set.
482 */
483 if (cred->cr_uid == 0 &&
484 (!jailed(cred) || jail_chflags_allowed)) {
485 if ((ip->i_flags
486 & (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND)) &&
487 securelevel > 0)
488 return (EPERM);
489 ip->i_flags = vap->va_flags;
490 } else {
491 if (ip->i_flags
492 & (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND) ||
493 (vap->va_flags & UF_SETTABLE) != vap->va_flags)
494 return (EPERM);
495 ip->i_flags &= SF_SETTABLE;
496 ip->i_flags |= (vap->va_flags & UF_SETTABLE);
497 }
498 ip->i_flag |= IN_CHANGE;
499 if (vap->va_flags & (IMMUTABLE | APPEND))
500 return (0);
501 }
502 if (ip->i_flags & (IMMUTABLE | APPEND))
503 return (EPERM);
504 /*
505 * Go through the fields and update iff not VNOVAL.
506 */
507 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
508 if (vp->v_mount->mnt_flag & MNT_RDONLY)
509 return (EROFS);
510 if ((error = ufs_chown(vp, vap->va_uid, vap->va_gid, cred)) != 0)
511 return (error);
512 }
513 if (vap->va_size != VNOVAL) {
514 /*
515 * Disallow write attempts on read-only filesystems;
516 * unless the file is a socket, fifo, or a block or
517 * character device resident on the filesystem.
518 */
519 switch (vp->v_type) {
520 case VDIR:
521 return (EISDIR);
522 case VLNK:
523 case VREG:
524 if (vp->v_mount->mnt_flag & MNT_RDONLY)
525 return (EROFS);
526 break;
527 default:
528 break;
529 }
530 if ((error = ffs_truncate(vp, vap->va_size, 0, cred)) != 0)
531 return (error);
532 }
533 ip = VTOI(vp);
534 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
535 if (vp->v_mount->mnt_flag & MNT_RDONLY)
536 return (EROFS);
537 if (cred->cr_uid != ip->i_uid &&
538 (error = suser_cred(cred, PRISON_ROOT)) &&
539 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
540 (error = VOP_ACCESS(vp, VWRITE, cred))))
541 return (error);
542 if (vap->va_atime.tv_sec != VNOVAL)
543 ip->i_flag |= IN_ACCESS;
544 if (vap->va_mtime.tv_sec != VNOVAL)
545 ip->i_flag |= IN_CHANGE | IN_UPDATE;
546 ufs_itimes(vp);
547 if (vap->va_atime.tv_sec != VNOVAL) {
548 ip->i_atime = vap->va_atime.tv_sec;
549 ip->i_atimensec = vap->va_atime.tv_nsec;
550 }
551 if (vap->va_mtime.tv_sec != VNOVAL) {
552 ip->i_mtime = vap->va_mtime.tv_sec;
553 ip->i_mtimensec = vap->va_mtime.tv_nsec;
554 }
555 error = ffs_update(vp, 0);
556 if (error)
557 return (error);
558 }
559 error = 0;
560 if (vap->va_mode != (mode_t)VNOVAL) {
561 if (vp->v_mount->mnt_flag & MNT_RDONLY)
562 return (EROFS);
563 error = ufs_chmod(vp, (int)vap->va_mode, cred);
564 }
565 VN_KNOTE(vp, NOTE_ATTRIB);
566 return (error);
567 }
568
569 /*
570 * Change the mode on a file.
571 * Inode must be locked before calling.
572 */
573 static int
574 ufs_chmod(struct vnode *vp, int mode, struct ucred *cred)
575 {
576 struct inode *ip = VTOI(vp);
577 int error;
578
579 if (cred->cr_uid != ip->i_uid) {
580 error = suser_cred(cred, PRISON_ROOT);
581 if (error)
582 return (error);
583 }
584 if (cred->cr_uid) {
585 if (vp->v_type != VDIR && (mode & S_ISTXT))
586 return (EFTYPE);
587 if (!groupmember(ip->i_gid, cred) && (mode & ISGID))
588 return (EPERM);
589 }
590 ip->i_mode &= ~ALLPERMS;
591 ip->i_mode |= (mode & ALLPERMS);
592 ip->i_flag |= IN_CHANGE;
593 return (0);
594 }
595
596 /*
597 * Perform chown operation on inode ip;
598 * inode must be locked prior to call.
599 */
600 static int
601 ufs_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred)
602 {
603 struct inode *ip = VTOI(vp);
604 uid_t ouid;
605 gid_t ogid;
606 int error = 0;
607 #ifdef QUOTA
608 int i;
609 long change;
610 #endif
611
612 if (uid == (uid_t)VNOVAL)
613 uid = ip->i_uid;
614 if (gid == (gid_t)VNOVAL)
615 gid = ip->i_gid;
616 /*
617 * If we don't own the file, are trying to change the owner
618 * of the file, or are not a member of the target group,
619 * the caller must be superuser or the call fails.
620 */
621 if ((cred->cr_uid != ip->i_uid || uid != ip->i_uid ||
622 (gid != ip->i_gid && !(cred->cr_gid == gid ||
623 groupmember((gid_t)gid, cred)))) &&
624 (error = suser_cred(cred, PRISON_ROOT)))
625 return (error);
626 ogid = ip->i_gid;
627 ouid = ip->i_uid;
628 #ifdef QUOTA
629 if ((error = ufs_getinoquota(ip)) != 0)
630 return (error);
631 if (ouid == uid) {
632 ufs_dqrele(vp, ip->i_dquot[USRQUOTA]);
633 ip->i_dquot[USRQUOTA] = NODQUOT;
634 }
635 if (ogid == gid) {
636 ufs_dqrele(vp, ip->i_dquot[GRPQUOTA]);
637 ip->i_dquot[GRPQUOTA] = NODQUOT;
638 }
639 change = ip->i_blocks;
640 (void) ufs_chkdq(ip, -change, cred, CHOWN);
641 (void) ufs_chkiq(ip, -1, cred, CHOWN);
642 for (i = 0; i < MAXQUOTAS; i++) {
643 ufs_dqrele(vp, ip->i_dquot[i]);
644 ip->i_dquot[i] = NODQUOT;
645 }
646 #endif
647 ip->i_gid = gid;
648 ip->i_uid = uid;
649 #ifdef QUOTA
650 if ((error = ufs_getinoquota(ip)) == 0) {
651 if (ouid == uid) {
652 ufs_dqrele(vp, ip->i_dquot[USRQUOTA]);
653 ip->i_dquot[USRQUOTA] = NODQUOT;
654 }
655 if (ogid == gid) {
656 ufs_dqrele(vp, ip->i_dquot[GRPQUOTA]);
657 ip->i_dquot[GRPQUOTA] = NODQUOT;
658 }
659 if ((error = ufs_chkdq(ip, change, cred, CHOWN)) == 0) {
660 if ((error = ufs_chkiq(ip, 1, cred, CHOWN)) == 0)
661 goto good;
662 else
663 (void)ufs_chkdq(ip, -change, cred, CHOWN|FORCE);
664 }
665 for (i = 0; i < MAXQUOTAS; i++) {
666 ufs_dqrele(vp, ip->i_dquot[i]);
667 ip->i_dquot[i] = NODQUOT;
668 }
669 }
670 ip->i_gid = ogid;
671 ip->i_uid = ouid;
672 if (ufs_getinoquota(ip) == 0) {
673 if (ouid == uid) {
674 ufs_dqrele(vp, ip->i_dquot[USRQUOTA]);
675 ip->i_dquot[USRQUOTA] = NODQUOT;
676 }
677 if (ogid == gid) {
678 ufs_dqrele(vp, ip->i_dquot[GRPQUOTA]);
679 ip->i_dquot[GRPQUOTA] = NODQUOT;
680 }
681 (void) ufs_chkdq(ip, change, cred, FORCE|CHOWN);
682 (void) ufs_chkiq(ip, 1, cred, FORCE|CHOWN);
683 (void) ufs_getinoquota(ip);
684 }
685 return (error);
686 good:
687 if (ufs_getinoquota(ip))
688 panic("ufs_chown: lost quota");
689 #endif /* QUOTA */
690 ip->i_flag |= IN_CHANGE;
691 if (cred->cr_uid != 0 && (ouid != uid || ogid != gid))
692 ip->i_mode &= ~(ISUID | ISGID);
693 return (0);
694 }
695
696 /*
697 * Mmap a file
698 *
699 * NB Currently unsupported.
700 *
701 * ufs_mmap(struct vnode *a_vp, int a_fflags, struct ucred *a_cred)
702 */
703 /* ARGSUSED */
704 static
705 int
706 ufs_mmap(struct vop_mmap_args *ap)
707 {
708 return (EINVAL);
709 }
710
711 /*
712 * ufs_remove(struct vnode *a_dvp, struct vnode *a_vp,
713 * struct componentname *a_cnp)
714 */
715 static
716 int
717 ufs_remove(struct vop_old_remove_args *ap)
718 {
719 struct inode *ip;
720 struct vnode *vp = ap->a_vp;
721 struct vnode *dvp = ap->a_dvp;
722 int error;
723
724 ip = VTOI(vp);
725 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
726 (VTOI(dvp)->i_flags & APPEND)) {
727 error = EPERM;
728 goto out;
729 }
730 error = ufs_dirremove(dvp, ip, ap->a_cnp->cn_flags, 0);
731 VN_KNOTE(vp, NOTE_DELETE);
732 VN_KNOTE(dvp, NOTE_WRITE);
733 out:
734 return (error);
735 }
736
737 /*
738 * link vnode call
739 *
740 * ufs_link(struct vnode *a_tdvp, struct vnode *a_vp,
741 * struct componentname *a_cnp)
742 */
743 static
744 int
745 ufs_link(struct vop_old_link_args *ap)
746 {
747 struct vnode *vp = ap->a_vp;
748 struct vnode *tdvp = ap->a_tdvp;
749 struct componentname *cnp = ap->a_cnp;
750 struct inode *ip;
751 struct direct newdir;
752 int error;
753
754 if (tdvp->v_mount != vp->v_mount) {
755 error = EXDEV;
756 goto out2;
757 }
758 if (tdvp != vp && (error = vn_lock(vp, LK_EXCLUSIVE))) {
759 goto out2;
760 }
761 ip = VTOI(vp);
762 if ((nlink_t)ip->i_nlink >= LINK_MAX) {
763 error = EMLINK;
764 goto out1;
765 }
766 if (ip->i_flags & (IMMUTABLE | APPEND)) {
767 error = EPERM;
768 goto out1;
769 }
770 ip->i_effnlink++;
771 ip->i_nlink++;
772 ip->i_flag |= IN_CHANGE;
773 if (DOINGSOFTDEP(vp))
774 softdep_change_linkcnt(ip);
775 error = ffs_update(vp, !(DOINGSOFTDEP(vp) | DOINGASYNC(vp)));
776 if (!error) {
777 ufs_makedirentry(ip, cnp, &newdir);
778 error = ufs_direnter(tdvp, vp, &newdir, cnp, NULL);
779 }
780
781 if (error) {
782 ip->i_effnlink--;
783 ip->i_nlink--;
784 ip->i_flag |= IN_CHANGE;
785 if (DOINGSOFTDEP(vp))
786 softdep_change_linkcnt(ip);
787 }
788 out1:
789 if (tdvp != vp)
790 vn_unlock(vp);
791 out2:
792 VN_KNOTE(vp, NOTE_LINK);
793 VN_KNOTE(tdvp, NOTE_WRITE);
794 return (error);
795 }
796
797 /*
798 * whiteout vnode call
799 *
800 * ufs_whiteout(struct vnode *a_dvp, struct componentname *a_cnp, int a_flags)
801 */
802 static
803 int
804 ufs_whiteout(struct vop_old_whiteout_args *ap)
805 {
806 struct vnode *dvp = ap->a_dvp;
807 struct componentname *cnp = ap->a_cnp;
808 struct direct newdir;
809 int error = 0;
810
811 switch (ap->a_flags) {
812 case NAMEI_LOOKUP:
813 /* 4.4 format directories support whiteout operations */
814 if (dvp->v_mount->mnt_maxsymlinklen > 0)
815 return (0);
816 return (EOPNOTSUPP);
817
818 case NAMEI_CREATE:
819 /* create a new directory whiteout */
820 #ifdef DIAGNOSTIC
821 if (dvp->v_mount->mnt_maxsymlinklen <= 0)
822 panic("ufs_whiteout: old format filesystem");
823 #endif
824
825 newdir.d_ino = WINO;
826 newdir.d_namlen = cnp->cn_namelen;
827 bcopy(cnp->cn_nameptr, newdir.d_name, (unsigned)cnp->cn_namelen + 1);
828 newdir.d_type = DT_WHT;
829 error = ufs_direnter(dvp, NULL, &newdir, cnp, NULL);
830 break;
831
832 case NAMEI_DELETE:
833 /* remove an existing directory whiteout */
834 #ifdef DIAGNOSTIC
835 if (dvp->v_mount->mnt_maxsymlinklen <= 0)
836 panic("ufs_whiteout: old format filesystem");
837 #endif
838
839 cnp->cn_flags &= ~CNP_DOWHITEOUT;
840 error = ufs_dirremove(dvp, NULL, cnp->cn_flags, 0);
841 break;
842 default:
843 panic("ufs_whiteout: unknown op");
844 }
845 return (error);
846 }
847
848 /*
849 * Rename system call.
850 * rename("foo", "bar");
851 * is essentially
852 * unlink("bar");
853 * link("foo", "bar");
854 * unlink("foo");
855 * but ``atomically''. Can't do full commit without saving state in the
856 * inode on disk which isn't feasible at this time. Best we can do is
857 * always guarantee the target exists.
858 *
859 * Basic algorithm is:
860 *
861 * 1) Bump link count on source while we're linking it to the
862 * target. This also ensure the inode won't be deleted out
863 * from underneath us while we work (it may be truncated by
864 * a concurrent `trunc' or `open' for creation).
865 * 2) Link source to destination. If destination already exists,
866 * delete it first.
867 * 3) Unlink source reference to inode if still around. If a
868 * directory was moved and the parent of the destination
869 * is different from the source, patch the ".." entry in the
870 * directory.
871 *
872 * ufs_rename(struct vnode *a_fdvp, struct vnode *a_fvp,
873 * struct componentname *a_fcnp, struct vnode *a_tdvp,
874 * struct vnode *a_tvp, struct componentname *a_tcnp)
875 */
876 static
877 int
878 ufs_rename(struct vop_old_rename_args *ap)
879 {
880 struct vnode *tvp = ap->a_tvp;
881 struct vnode *tdvp = ap->a_tdvp;
882 struct vnode *fvp = ap->a_fvp;
883 struct vnode *fdvp = ap->a_fdvp;
884 struct componentname *tcnp = ap->a_tcnp;
885 struct componentname *fcnp = ap->a_fcnp;
886 struct inode *ip, *xp, *dp;
887 struct direct newdir;
888 ino_t oldparent = 0, newparent = 0;
889 int doingdirectory = 0;
890 int error = 0, ioflag;
891
892 /*
893 * Check for cross-device rename.
894 */
895 if ((fvp->v_mount != tdvp->v_mount) ||
896 (tvp && (fvp->v_mount != tvp->v_mount))) {
897 error = EXDEV;
898 abortit:
899 if (tdvp == tvp)
900 vrele(tdvp);
901 else
902 vput(tdvp);
903 if (tvp)
904 vput(tvp);
905 vrele(fdvp);
906 vrele(fvp);
907 return (error);
908 }
909
910 if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
911 (VTOI(tdvp)->i_flags & APPEND))) {
912 error = EPERM;
913 goto abortit;
914 }
915
916 /*
917 * Renaming a file to itself has no effect. The upper layers should
918 * not call us in that case. Temporarily just warn if they do.
919 */
920 if (fvp == tvp) {
921 kprintf("ufs_rename: fvp == tvp (can't happen)\n");
922 error = 0;
923 goto abortit;
924 }
925
926 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0)
927 goto abortit;
928
929 /*
930 * Note: now that fvp is locked we have to be sure to unlock it before
931 * using the 'abortit' target.
932 */
933 dp = VTOI(fdvp);
934 ip = VTOI(fvp);
935 if (ip->i_nlink >= LINK_MAX) {
936 vn_unlock(fvp);
937 error = EMLINK;
938 goto abortit;
939 }
940 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))
941 || (dp->i_flags & APPEND)) {
942 vn_unlock(fvp);
943 error = EPERM;
944 goto abortit;
945 }
946 if ((ip->i_mode & IFMT) == IFDIR) {
947 /*
948 * Avoid ".", "..", and aliases of "." for obvious reasons.
949 */
950 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
951 dp == ip || (fcnp->cn_flags | tcnp->cn_flags) & CNP_ISDOTDOT ||
952 (ip->i_flag & IN_RENAME)) {
953 vn_unlock(fvp);
954 error = EINVAL;
955 goto abortit;
956 }
957 ip->i_flag |= IN_RENAME;
958 oldparent = dp->i_number;
959 doingdirectory = 1;
960 }
961 VN_KNOTE(fdvp, NOTE_WRITE); /* XXX right place? */
962
963 /*
964 * fvp still locked. ip->i_flag has IN_RENAME set if doingdirectory.
965 * Cleanup fvp requirements so we can unlock it.
966 *
967 * tvp and tdvp are locked. tvp may be NULL. Now that dp and xp
968 * is setup we can use the 'bad' target if we unlock fvp. We cannot
969 * use the abortit target anymore because of IN_RENAME.
970 */
971 dp = VTOI(tdvp);
972 if (tvp)
973 xp = VTOI(tvp);
974 else
975 xp = NULL;
976
977 /*
978 * 1) Bump link count while we're moving stuff
979 * around. If we crash somewhere before
980 * completing our work, the link count
981 * may be wrong, but correctable.
982 */
983 ip->i_effnlink++;
984 ip->i_nlink++;
985 ip->i_flag |= IN_CHANGE;
986 if (DOINGSOFTDEP(fvp))
987 softdep_change_linkcnt(ip);
988 if ((error = ffs_update(fvp, !(DOINGSOFTDEP(fvp) |
989 DOINGASYNC(fvp)))) != 0) {
990 vn_unlock(fvp);
991 goto bad;
992 }
993
994 /*
995 * If ".." must be changed (ie the directory gets a new
996 * parent) then the source directory must not be in the
997 * directory heirarchy above the target, as this would
998 * orphan everything below the source directory. Also
999 * the user must have write permission in the source so
1000 * as to be able to change "..". We must repeat the call
1001 * to namei, as the parent directory is unlocked by the
1002 * call to checkpath().
1003 */
1004 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred);
1005 vn_unlock(fvp);
1006
1007 /*
1008 * We are now back to where we were in that fvp, fdvp are unlocked
1009 * and tvp, tdvp are locked. tvp may be NULL. IN_RENAME may be
1010 * set. Only the bad target or, if we clean up tvp and tdvp, the
1011 * out target, may be used.
1012 */
1013 if (oldparent != dp->i_number)
1014 newparent = dp->i_number;
1015 if (doingdirectory && newparent) {
1016 if (error) /* write access check above */
1017 goto bad;
1018
1019 /*
1020 * Once we start messing with tvp and tdvp we cannot use the
1021 * 'bad' target, only finish cleaning tdvp and tvp up and
1022 * use the 'out' target.
1023 *
1024 * This cleans up tvp.
1025 */
1026 if (xp != NULL) {
1027 vput(tvp);
1028 xp = NULL;
1029 }
1030
1031 /*
1032 * This is a real mess. ufs_checkpath vput's the target
1033 * directory so retain an extra ref and note that tdvp will
1034 * lose its lock on return. This leaves us with one good
1035 * ref after ufs_checkpath returns.
1036 */
1037 vref(tdvp);
1038 error = ufs_checkpath(ip, dp, tcnp->cn_cred);
1039 tcnp->cn_flags |= CNP_PDIRUNLOCK;
1040 if (error) {
1041 vrele(tdvp);
1042 goto out;
1043 }
1044
1045 /*
1046 * relookup no longer messes with tdvp's refs. tdvp must be
1047 * unlocked on entry and will be locked on a successful
1048 * return.
1049 */
1050 error = relookup(tdvp, &tvp, tcnp);
1051 if (error) {
1052 if (tcnp->cn_flags & CNP_PDIRUNLOCK)
1053 vrele(tdvp);
1054 else
1055 vput(tdvp);
1056 goto out;
1057 }
1058 KKASSERT((tcnp->cn_flags & CNP_PDIRUNLOCK) == 0);
1059 dp = VTOI(tdvp);
1060 if (tvp)
1061 xp = VTOI(tvp);
1062 }
1063
1064 /*
1065 * We are back to fvp, fdvp unlocked, tvp, tdvp locked. tvp may
1066 * be NULL (xp will also be NULL in that case), and IN_RENAME will
1067 * be set if doingdirectory. This means we can use the 'bad' target
1068 * again.
1069 */
1070
1071 /*
1072 * 2) If target doesn't exist, link the target
1073 * to the source and unlink the source.
1074 * Otherwise, rewrite the target directory
1075 * entry to reference the source inode and
1076 * expunge the original entry's existence.
1077 */
1078 if (xp == NULL) {
1079 if (dp->i_dev != ip->i_dev)
1080 panic("ufs_rename: EXDEV");
1081 /*
1082 * Account for ".." in new directory.
1083 * When source and destination have the same
1084 * parent we don't fool with the link count.
1085 */
1086 if (doingdirectory && newparent) {
1087 if ((nlink_t)dp->i_nlink >= LINK_MAX) {
1088 error = EMLINK;
1089 goto bad;
1090 }
1091 dp->i_effnlink++;
1092 dp->i_nlink++;
1093 dp->i_flag |= IN_CHANGE;
1094 if (DOINGSOFTDEP(tdvp))
1095 softdep_change_linkcnt(dp);
1096 error = ffs_update(tdvp, !(DOINGSOFTDEP(tdvp) |
1097 DOINGASYNC(tdvp)));
1098 if (error)
1099 goto bad;
1100 }
1101 ufs_makedirentry(ip, tcnp, &newdir);
1102 error = ufs_direnter(tdvp, NULL, &newdir, tcnp, NULL);
1103 if (error) {
1104 if (doingdirectory && newparent) {
1105 dp->i_effnlink--;
1106 dp->i_nlink--;
1107 dp->i_flag |= IN_CHANGE;
1108 if (DOINGSOFTDEP(tdvp))
1109 softdep_change_linkcnt(dp);
1110 (void)ffs_update(tdvp, 1);
1111 }
1112 goto bad;
1113 }
1114 VN_KNOTE(tdvp, NOTE_WRITE);
1115 vput(tdvp);
1116 } else {
1117 if (xp->i_dev != dp->i_dev || xp->i_dev != ip->i_dev)
1118 panic("ufs_rename: EXDEV");
1119 /*
1120 * Short circuit rename(foo, foo).
1121 */
1122 if (xp->i_number == ip->i_number)
1123 panic("ufs_rename: same file");
1124 /*
1125 * If the parent directory is "sticky", then the user must
1126 * own the parent directory, or the destination of the rename,
1127 * otherwise the destination may not be changed (except by
1128 * root). This implements append-only directories.
1129 */
1130 if ((dp->i_mode & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 &&
1131 tcnp->cn_cred->cr_uid != dp->i_uid &&
1132 xp->i_uid != tcnp->cn_cred->cr_uid) {
1133 error = EPERM;
1134 goto bad;
1135 }
1136 /*
1137 * Target must be empty if a directory and have no links
1138 * to it. Also, ensure source and target are compatible
1139 * (both directories, or both not directories).
1140 *
1141 * Purge the file or directory being replaced from the
1142 * nameccache.
1143 */
1144 if ((xp->i_mode&IFMT) == IFDIR) {
1145 if ((xp->i_effnlink > 2) ||
1146 !ufs_dirempty(xp, dp->i_number, tcnp->cn_cred)) {
1147 error = ENOTEMPTY;
1148 goto bad;
1149 }
1150 if (!doingdirectory) {
1151 error = ENOTDIR;
1152 goto bad;
1153 }
1154 /* cache_purge removed - handled by VFS compat layer */
1155 } else if (doingdirectory == 0) {
1156 /* cache_purge removed - handled by VFS compat layer */
1157 } else {
1158 error = EISDIR;
1159 goto bad;
1160 }
1161 /*
1162 * note: inode passed to ufs_dirrewrite() is 0 for a
1163 * non-directory file rename, 1 for a directory rename
1164 * in the same directory, and > 1 for an inode representing
1165 * the new directory.
1166 */
1167 error = ufs_dirrewrite(dp, xp, ip->i_number,
1168 IFTODT(ip->i_mode),
1169 (doingdirectory && newparent) ?
1170 newparent : (ino_t)doingdirectory);
1171 if (error)
1172 goto bad;
1173 if (doingdirectory) {
1174 if (!newparent) {
1175 dp->i_effnlink--;
1176 if (DOINGSOFTDEP(tdvp))
1177 softdep_change_linkcnt(dp);
1178 }
1179 xp->i_effnlink--;
1180 if (DOINGSOFTDEP(tvp))
1181 softdep_change_linkcnt(xp);
1182 }
1183 if (doingdirectory && !DOINGSOFTDEP(tvp)) {
1184 /*
1185 * Truncate inode. The only stuff left in the directory
1186 * is "." and "..". The "." reference is inconsequential
1187 * since we are quashing it. We have removed the "."
1188 * reference and the reference in the parent directory,
1189 * but there may be other hard links. The soft
1190 * dependency code will arrange to do these operations
1191 * after the parent directory entry has been deleted on
1192 * disk, so when running with that code we avoid doing
1193 * them now.
1194 */
1195 if (!newparent) {
1196 dp->i_nlink--;
1197 dp->i_flag |= IN_CHANGE;
1198 }
1199 xp->i_nlink--;
1200 xp->i_flag |= IN_CHANGE;
1201 ioflag = DOINGASYNC(tvp) ? 0 : IO_SYNC;
1202 error = ffs_truncate(tvp, (off_t)0, ioflag,
1203 tcnp->cn_cred);
1204 if (error)
1205 goto bad;
1206 }
1207 VN_KNOTE(tdvp, NOTE_WRITE);
1208 vput(tdvp);
1209 VN_KNOTE(tvp, NOTE_DELETE);
1210 vput(tvp);
1211 xp = NULL;
1212 }
1213
1214 /*
1215 * tvp and tdvp have been cleaned up. only fvp and fdvp (both
1216 * unlocked) remain. We are about to overwrite fvp but we have to
1217 * keep 'ip' intact so we cannot release the old fvp, which is still
1218 * refd and accessible via ap->a_fvp.
1219 *
1220 * This means we cannot use either 'bad' or 'out' to cleanup any
1221 * more.
1222 */
1223
1224 /*
1225 * 3) Unlink the source.
1226 */
1227 fcnp->cn_flags &= ~CNP_MODMASK;
1228 fcnp->cn_flags |= CNP_LOCKPARENT;
1229 error = relookup(fdvp, &fvp, fcnp);
1230 if (error || fvp == NULL) {
1231 /*
1232 * From name has disappeared. IN_RENAME will not be set if
1233 * we get past the panic so we don't have to clean it up.
1234 */
1235 if (doingdirectory)
1236 panic("ufs_rename: lost dir entry");
1237 vrele(ap->a_fvp);
1238 if (fcnp->cn_flags & CNP_PDIRUNLOCK)
1239 vrele(fdvp);
1240 else
1241 vput(fdvp);
1242 return(0);
1243 }
1244 KKASSERT((fcnp->cn_flags & CNP_PDIRUNLOCK) == 0);
1245
1246 /*
1247 * fdvp and fvp are locked.
1248 */
1249 xp = VTOI(fvp);
1250 dp = VTOI(fdvp);
1251
1252 /*
1253 * Ensure that the directory entry still exists and has not
1254 * changed while the new name has been entered. If the source is
1255 * a file then the entry may have been unlinked or renamed. In
1256 * either case there is no further work to be done. If the source
1257 * is a directory then it cannot have been rmdir'ed; the IN_RENAME
1258 * flag ensures that it cannot be moved by another rename or removed
1259 * by a rmdir. Cleanup IN_RENAME.
1260 */
1261 if (xp != ip) {
1262 if (doingdirectory)
1263 panic("ufs_rename: lost dir entry");
1264 } else {
1265 /*
1266 * If the source is a directory with a
1267 * new parent, the link count of the old
1268 * parent directory must be decremented
1269 * and ".." set to point to the new parent.
1270 */
1271 if (doingdirectory && newparent) {
1272 xp->i_offset = mastertemplate.dot_reclen;
1273 ufs_dirrewrite(xp, dp, newparent, DT_DIR, 0);
1274 /* cache_purge removed - handled by VFS compat layer */
1275 }
1276 error = ufs_dirremove(fdvp, xp, fcnp->cn_flags, 0);
1277 xp->i_flag &= ~IN_RENAME;
1278 }
1279
1280 VN_KNOTE(fvp, NOTE_RENAME);
1281 vput(fdvp);
1282 vput(fvp);
1283 vrele(ap->a_fvp);
1284 return (error);
1285
1286 bad:
1287 if (xp)
1288 vput(ITOV(xp));
1289 vput(ITOV(dp));
1290 out:
1291 if (doingdirectory)
1292 ip->i_flag &= ~IN_RENAME;
1293 if (vn_lock(fvp, LK_EXCLUSIVE) == 0) {
1294 ip->i_effnlink--;
1295 ip->i_nlink--;
1296 ip->i_flag |= IN_CHANGE;
1297 ip->i_flag &= ~IN_RENAME;
1298 if (DOINGSOFTDEP(fvp))
1299 softdep_change_linkcnt(ip);
1300 vput(fvp);
1301 } else {
1302 vrele(fvp);
1303 }
1304 return (error);
1305 }
1306
1307 /*
1308 * Mkdir system call
1309 *
1310 * ufs_mkdir(struct vnode *a_dvp, struct vnode **a_vpp,
1311 * struct componentname *a_cnp, struct vattr *a_vap)
1312 */
1313 static
1314 int
1315 ufs_mkdir(struct vop_old_mkdir_args *ap)
1316 {
1317 struct vnode *dvp = ap->a_dvp;
1318 struct vattr *vap = ap->a_vap;
1319 struct componentname *cnp = ap->a_cnp;
1320 struct inode *ip, *dp;
1321 struct vnode *tvp;
1322 struct buf *bp;
1323 struct dirtemplate dirtemplate, *dtp;
1324 struct direct newdir;
1325 int error, dmode;
1326 long blkoff;
1327
1328 dp = VTOI(dvp);
1329 if ((nlink_t)dp->i_nlink >= LINK_MAX) {
1330 error = EMLINK;
1331 goto out;
1332 }
1333 dmode = vap->va_mode & 0777;
1334 dmode |= IFDIR;
1335 /*
1336 * Must simulate part of ufs_makeinode here to acquire the inode,
1337 * but not have it entered in the parent directory. The entry is
1338 * made later after writing "." and ".." entries.
1339 */
1340 error = ffs_valloc(dvp, dmode, cnp->cn_cred, &tvp);
1341 if (error)
1342 goto out;
1343 ip = VTOI(tvp);
1344 ip->i_gid = dp->i_gid;
1345 #ifdef SUIDDIR
1346 {
1347 #ifdef QUOTA
1348 struct ucred ucred, *ucp;
1349 ucp = cnp->cn_cred;
1350 #endif
1351 /*
1352 * If we are hacking owners here, (only do this where told to)
1353 * and we are not giving it TO root, (would subvert quotas)
1354 * then go ahead and give it to the other user.
1355 * The new directory also inherits the SUID bit.
1356 * If user's UID and dir UID are the same,
1357 * 'give it away' so that the SUID is still forced on.
1358 */
1359 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) &&
1360 (dp->i_mode & ISUID) && dp->i_uid) {
1361 dmode |= ISUID;
1362 ip->i_uid = dp->i_uid;
1363 #ifdef QUOTA
1364 if (dp->i_uid != cnp->cn_cred->cr_uid) {
1365 /*
1366 * Make sure the correct user gets charged
1367 * for the space.
1368 * Make a dummy credential for the victim.
1369 * XXX This seems to never be accessed out of
1370 * our context so a stack variable is ok.
1371 */
1372 ucred.cr_ref = 1;
1373 ucred.cr_uid = ip->i_uid;
1374 ucred.cr_ngroups = 1;
1375 ucred.cr_groups[0] = dp->i_gid;
1376 ucp = &ucred;
1377 }
1378 #endif
1379 } else
1380 ip->i_uid = cnp->cn_cred->cr_uid;
1381 #ifdef QUOTA
1382 if ((error = ufs_getinoquota(ip)) ||
1383 (error = ufs_chkiq(ip, 1, ucp, 0))) {
1384 ffs_vfree(tvp, ip->i_number, dmode);
1385 vput(tvp);
1386 return (error);
1387 }
1388 #endif
1389 }
1390 #else /* !SUIDDIR */
1391 ip->i_uid = cnp->cn_cred->cr_uid;
1392 #ifdef QUOTA
1393 if ((error = ufs_getinoquota(ip)) ||
1394 (error = ufs_chkiq(ip, 1, cnp->cn_cred, 0))) {
1395 ffs_vfree(tvp, ip->i_number, dmode);
1396 vput(tvp);
1397 return (error);
1398 }
1399 #endif
1400 #endif /* !SUIDDIR */
1401 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
1402 ip->i_mode = dmode;
1403 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */
1404 ip->i_effnlink = 2;
1405 ip->i_nlink = 2;
1406 if (DOINGSOFTDEP(tvp))
1407 softdep_change_linkcnt(ip);
1408 if (cnp->cn_flags & CNP_ISWHITEOUT)
1409 ip->i_flags |= UF_OPAQUE;
1410
1411 /*
1412 * Bump link count in parent directory to reflect work done below.
1413 * Should be done before reference is created so cleanup is
1414 * possible if we crash.
1415 */
1416 dp->i_effnlink++;
1417 dp->i_nlink++;
1418 dp->i_flag |= IN_CHANGE;
1419 if (DOINGSOFTDEP(dvp))
1420 softdep_change_linkcnt(dp);
1421 error = ffs_update(tvp, !(DOINGSOFTDEP(dvp) | DOINGASYNC(dvp)));
1422 if (error)
1423 goto bad;
1424
1425 /*
1426 * The vnode must have a VM object in order to issue buffer cache
1427 * ops on it.
1428 */
1429 vinitvmio(tvp, DIRBLKSIZ);
1430
1431 /*
1432 * Initialize directory with "." and ".." from static template.
1433 */
1434 if (dvp->v_mount->mnt_maxsymlinklen > 0)
1435 dtp = &mastertemplate;
1436 else
1437 dtp = (struct dirtemplate *)&omastertemplate;
1438 dirtemplate = *dtp;
1439 dirtemplate.dot_ino = ip->i_number;
1440 dirtemplate.dotdot_ino = dp->i_number;
1441 vnode_pager_setsize(tvp, DIRBLKSIZ);
1442 error = VOP_BALLOC(tvp, 0LL, DIRBLKSIZ, cnp->cn_cred, B_CLRBUF, &bp);
1443 if (error)
1444 goto bad;
1445 ip->i_size = DIRBLKSIZ;
1446 ip->i_flag |= IN_CHANGE | IN_UPDATE;
1447 bcopy((caddr_t)&dirtemplate, (caddr_t)bp->b_data, sizeof dirtemplate);
1448 if (DOINGSOFTDEP(tvp)) {
1449 /*
1450 * Ensure that the entire newly allocated block is a
1451 * valid directory so that future growth within the
1452 * block does not have to ensure that the block is
1453 * written before the inode.
1454 */
1455 blkoff = DIRBLKSIZ;
1456 while (blkoff < bp->b_bcount) {
1457 ((struct direct *)
1458 (bp->b_data + blkoff))->d_reclen = DIRBLKSIZ;
1459 blkoff += DIRBLKSIZ;
1460 }
1461 }
1462 if ((error = ffs_update(tvp, !(DOINGSOFTDEP(tvp) |
1463 DOINGASYNC(tvp)))) != 0) {
1464 bwrite(bp);
1465 goto bad;
1466 }
1467 /*
1468 * Directory set up, now install its entry in the parent directory.
1469 *
1470 * If we are not doing soft dependencies, then we must write out the
1471 * buffer containing the new directory body before entering the new
1472 * name in the parent. If we are doing soft dependencies, then the
1473 * buffer containing the new directory body will be passed to and
1474 * released in the soft dependency code after the code has attached
1475 * an appropriate ordering dependency to the buffer which ensures that
1476 * the buffer is written before the new name is written in the parent.
1477 */
1478 if (DOINGASYNC(dvp))
1479 bdwrite(bp);
1480 else if (!DOINGSOFTDEP(dvp) && (error = bwrite(bp)) != 0)
1481 goto bad;
1482 ufs_makedirentry(ip, cnp, &newdir);
1483 error = ufs_direnter(dvp, tvp, &newdir, cnp, bp);
1484
1485 bad:
1486 if (error == 0) {
1487 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK);
1488 *ap->a_vpp = tvp;
1489 } else {
1490 dp->i_effnlink--;
1491 dp->i_nlink--;
1492 dp->i_flag |= IN_CHANGE;
1493 if (DOINGSOFTDEP(dvp))
1494 softdep_change_linkcnt(dp);
1495 /*
1496 * No need to do an explicit VOP_TRUNCATE here, vrele will
1497 * do this for us because we set the link count to 0.
1498 */
1499 ip->i_effnlink = 0;
1500 ip->i_nlink = 0;
1501 ip->i_flag |= IN_CHANGE;
1502 if (DOINGSOFTDEP(tvp))
1503 softdep_change_linkcnt(ip);
1504 vput(tvp);
1505 }
1506 out:
1507 return (error);
1508 }
1509
1510 /*
1511 * Rmdir system call.
1512 *
1513 * ufs_rmdir(struct vnode *a_dvp, struct vnode *a_vp,
1514 * struct componentname *a_cnp)
1515 */
1516 static
1517 int
1518 ufs_rmdir(struct vop_old_rmdir_args *ap)
1519 {
1520 struct vnode *vp = ap->a_vp;
1521 struct vnode *dvp = ap->a_dvp;
1522 struct componentname *cnp = ap->a_cnp;
1523 struct inode *ip, *dp;
1524 int error, ioflag;
1525
1526 ip = VTOI(vp);
1527 dp = VTOI(dvp);
1528
1529 /*
1530 * Do not remove a directory that is in the process of being renamed.
1531 * Verify the directory is empty (and valid). Rmdir ".." will not be
1532 * valid since ".." will contain a reference to the current directory
1533 * and thus be non-empty. Do not allow the removal of mounted on
1534 * directories (this can happen when an NFS exported filesystem
1535 * tries to remove a locally mounted on directory).
1536 */
1537 error = 0;
1538 if (ip->i_flag & IN_RENAME) {
1539 error = EINVAL;
1540 goto out;
1541 }
1542 if (ip->i_effnlink != 2 ||
1543 !ufs_dirempty(ip, dp->i_number, cnp->cn_cred)) {
1544 error = ENOTEMPTY;
1545 goto out;
1546 }
1547 if ((dp->i_flags & APPEND)
1548 || (ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))) {
1549 error = EPERM;
1550 goto out;
1551 }
1552 /*
1553 * Delete reference to directory before purging
1554 * inode. If we crash in between, the directory
1555 * will be reattached to lost+found,
1556 */
1557 dp->i_effnlink--;
1558 ip->i_effnlink--;
1559 if (DOINGSOFTDEP(vp)) {
1560 softdep_change_linkcnt(dp);
1561 softdep_change_linkcnt(ip);
1562 }
1563 error = ufs_dirremove(dvp, ip, cnp->cn_flags, 1);
1564 if (error) {
1565 dp->i_effnlink++;
1566 ip->i_effnlink++;
1567 if (DOINGSOFTDEP(vp)) {
1568 softdep_change_linkcnt(dp);
1569 softdep_change_linkcnt(ip);
1570 }
1571 goto out;
1572 }
1573 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK);
1574 /*
1575 * Truncate inode. The only stuff left in the directory is "." and
1576 * "..". The "." reference is inconsequential since we are quashing
1577 * it. The soft dependency code will arrange to do these operations
1578 * after the parent directory entry has been deleted on disk, so
1579 * when running with that code we avoid doing them now.
1580 */
1581 if (!DOINGSOFTDEP(vp)) {
1582 dp->i_nlink--;
1583 dp->i_flag |= IN_CHANGE;
1584 ip->i_nlink--;
1585 ip->i_flag |= IN_CHANGE;
1586 ioflag = DOINGASYNC(vp) ? 0 : IO_SYNC;
1587 error = ffs_truncate(vp, (off_t)0, ioflag, cnp->cn_cred);
1588 }
1589 /* cache_purge removed - handled by VFS compat layer */
1590 #ifdef UFS_DIRHASH
1591 /* Kill any active hash; i_effnlink == 0, so it will not come back. */
1592 if (ip->i_dirhash != NULL)
1593 ufsdirhash_free(ip);
1594 #endif
1595 out:
1596 VN_KNOTE(vp, NOTE_DELETE);
1597 return (error);
1598 }
1599
1600 /*
1601 * symlink -- make a symbolic link
1602 *
1603 * ufs_symlink(struct vnode *a_dvp, struct vnode **a_vpp,
1604 * struct componentname *a_cnp, struct vattr *a_vap,
1605 * char *a_target)
1606 */
1607 static
1608 int
1609 ufs_symlink(struct vop_old_symlink_args *ap)
1610 {
1611 struct vnode *vp, **vpp = ap->a_vpp;
1612 struct inode *ip;
1613 int len, error;
1614
1615 error = ufs_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp,
1616 vpp, ap->a_cnp);
1617 if (error)
1618 return (error);
1619 VN_KNOTE(ap->a_dvp, NOTE_WRITE);
1620 vp = *vpp;
1621 len = strlen(ap->a_target);
1622 if (len < vp->v_mount->mnt_maxsymlinklen) {
1623 ip = VTOI(vp);
1624 bcopy(ap->a_target, (char *)ip->i_shortlink, len);
1625 ip->i_size = len;
1626 ip->i_flag |= IN_CHANGE | IN_UPDATE;
1627 } else {
1628 /*
1629 * Make sure we have a VM object in order to use
1630 * the buffer cache.
1631 */
1632 if (vp->v_object == NULL)
1633 vinitvmio(vp, 0);
1634 error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0,
1635 UIO_SYSSPACE, IO_NODELOCKED,
1636 ap->a_cnp->cn_cred, NULL);
1637 }
1638 if (error)
1639 vput(vp);
1640 return (error);
1641 }
1642
1643 /*
1644 * Vnode op for reading directories.
1645 *
1646 * ufs_readdir(struct vnode *a_vp, struct uio *a_uio, struct ucred *a_cred,
1647 * int *a_eofflag, int *ncookies, off_t **a_cookies)
1648 */
1649 static
1650 int
1651 ufs_readdir(struct vop_readdir_args *ap)
1652 {
1653 struct uio *uio = ap->a_uio;
1654 struct vnode *vp = ap->a_vp;
1655 struct direct *dp;
1656 struct buf *bp;
1657 int retval;
1658 int error;
1659 int offset; /* offset into buffer cache buffer */
1660 int eoffset; /* end of buffer clipped to file EOF */
1661 int pickup; /* pickup point */
1662 int ncookies;
1663 int cookie_index;
1664 off_t *cookies;
1665
1666 if (uio->uio_offset < 0)
1667 return (EINVAL);
1668 /*
1669 * Guess the number of cookies needed. Make sure we compute at
1670 * least 1, and no more then a reasonable limit.
1671 */
1672 if (ap->a_ncookies) {
1673 ncookies = uio->uio_resid / 16 + 1;
1674 if (ncookies > 1024)
1675 ncookies = 1024;
1676 cookies = kmalloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK);
1677 } else {
1678 ncookies = -1; /* force conditionals below */
1679 cookies = NULL;
1680 }
1681 cookie_index = 0;
1682
1683 if ((error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY)) != 0)
1684 return (error);
1685
1686 /*
1687 * Past or at EOF
1688 */
1689 if (uio->uio_offset >= VTOI(vp)->i_size) {
1690 if (ap->a_eofflag)
1691 *ap->a_eofflag = 1;
1692 if (ap->a_ncookies) {
1693 *ap->a_ncookies = cookie_index;
1694 *ap->a_cookies = cookies;
1695 }
1696 goto done;
1697 }
1698
1699 /*
1700 * Loop until we run out of cookies, we run out of user buffer,
1701 * or we hit the directory EOF.
1702 *
1703 * Always start scans at the beginning of the buffer, don't trust
1704 * the offset supplied by userland.
1705 */
1706 while ((error = ffs_blkatoff_ra(vp, uio->uio_offset, NULL, &bp, 2)) == 0) {
1707 pickup = (int)(uio->uio_offset - bp->b_loffset);
1708 offset = 0;
1709 retval = 0;
1710 if (bp->b_loffset + bp->b_bcount > VTOI(vp)->i_size)
1711 eoffset = (int)(VTOI(vp)->i_size - bp->b_loffset);
1712 else
1713 eoffset = bp->b_bcount;
1714
1715 while (offset < eoffset) {
1716 dp = (struct direct *)(bp->b_data + offset);
1717 if (dp->d_reclen <= 0 || (dp->d_reclen & 3) ||
1718 offset + dp->d_reclen > bp->b_bcount) {
1719 error = EIO;
1720 break;
1721 }
1722 if (offsetof(struct direct, d_name[dp->d_namlen]) > dp->d_reclen) {
1723 error = EIO;
1724 break;
1725 }
1726 if (offset < pickup) {
1727 offset += dp->d_reclen;
1728 continue;
1729 }
1730 #if BYTE_ORDER == LITTLE_ENDIAN
1731 if (OFSFMT(vp)) {
1732 retval = vop_write_dirent(&error, uio,
1733 dp->d_ino, dp->d_namlen, dp->d_type,
1734 dp->d_name);
1735 } else
1736 #endif
1737 {
1738 retval = vop_write_dirent(&error, uio,
1739 dp->d_ino, dp->d_type, dp->d_namlen,
1740 dp->d_name);
1741 }
1742 if (retval)
1743 break;
1744 if (cookies)
1745 cookies[cookie_index] = bp->b_loffset + offset;
1746 ++cookie_index;
1747 offset += dp->d_reclen;
1748 if (cookie_index == ncookies)
1749 break;
1750 }
1751
1752 /*
1753 * This will align the next loop to the beginning of the
1754 * next block, and pickup will calculate to 0.
1755 */
1756 uio->uio_offset = bp->b_loffset + offset;
1757 brelse(bp);
1758
1759 if (retval || error || cookie_index == ncookies ||
1760 uio->uio_offset >= VTOI(vp)->i_size) {
1761 break;
1762 }
1763 }
1764 if (ap->a_eofflag)
1765 *ap->a_eofflag = VTOI(vp)->i_size <= uio->uio_offset;
1766
1767 /*
1768 * Report errors only if we didn't manage to read anything
1769 */
1770 if (error && cookie_index == 0) {
1771 if (cookies) {
1772 kfree(cookies, M_TEMP);
1773 *ap->a_ncookies = 0;
1774 *ap->a_cookies = NULL;
1775 }
1776 } else {
1777 error = 0;
1778 if (cookies) {
1779 *ap->a_ncookies = cookie_index;
1780 *ap->a_cookies = cookies;
1781 }
1782 }
1783 done:
1784 vn_unlock(vp);
1785 return (error);
1786 }
1787
1788 /*
1789 * Return target name of a symbolic link
1790 *
1791 * ufs_readlink(struct vnode *a_vp, struct uio *a_uio, struct ucred *a_cred)
1792 */
1793 static
1794 int
1795 ufs_readlink(struct vop_readlink_args *ap)
1796 {
1797 struct vnode *vp = ap->a_vp;
1798 struct inode *ip = VTOI(vp);
1799 int isize;
1800
1801 isize = ip->i_size;
1802 if ((isize < vp->v_mount->mnt_maxsymlinklen) ||
1803 (ip->i_din.di_blocks == 0)) { /* XXX - for old fastlink support */
1804 uiomove((char *)ip->i_shortlink, isize, ap->a_uio);
1805 return (0);
1806 }
1807
1808 /*
1809 * Perform the equivalent of an OPEN on vp so we can issue a
1810 * VOP_READ.
1811 */
1812 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred));
1813 }
1814
1815 /*
1816 * Calculate the logical to physical mapping if not done already,
1817 * then call the device strategy routine.
1818 *
1819 * In order to be able to swap to a file, the VOP_BMAP operation may not
1820 * deadlock on memory. See ufs_bmap() for details.
1821 *
1822 * ufs_strategy(struct vnode *a_vp, struct bio *a_bio)
1823 */
1824 static
1825 int
1826 ufs_strategy(struct vop_strategy_args *ap)
1827 {
1828 struct bio *bio = ap->a_bio;
1829 struct bio *nbio;
1830 struct buf *bp = bio->bio_buf;
1831 struct vnode *vp = ap->a_vp;
1832 struct inode *ip;
1833 int error;
1834
1835 ip = VTOI(vp);
1836 if (vp->v_type == VBLK || vp->v_type == VCHR)
1837 panic("ufs_strategy: spec");
1838 nbio = push_bio(bio);
1839 if (nbio->bio_offset == NOOFFSET) {
1840 error = VOP_BMAP(vp, bio->bio_offset, &nbio->bio_offset,
1841 NULL, NULL, bp->b_cmd);
1842 if (error) {
1843 bp->b_error = error;
1844 bp->b_flags |= B_ERROR;
1845 /* I/O was never started on nbio, must biodone(bio) */
1846 biodone(bio);
1847 return (error);
1848 }
1849 if (nbio->bio_offset == NOOFFSET)
1850 vfs_bio_clrbuf(bp);
1851 }
1852 if (nbio->bio_offset == NOOFFSET) {
1853 /*
1854 * We hit a hole in the file. The buffer has been zero-filled
1855 * so just biodone() it.
1856 */
1857 biodone(bio);
1858 } else {
1859 vn_strategy(ip->i_devvp, nbio);
1860 }
1861 return (0);
1862 }
1863
1864 /*
1865 * Print out the contents of an inode.
1866 *
1867 * ufs_print(struct vnode *a_vp)
1868 */
1869 static
1870 int
1871 ufs_print(struct vop_print_args *ap)
1872 {
1873 struct vnode *vp = ap->a_vp;
1874 struct inode *ip = VTOI(vp);
1875
1876 kprintf("tag VT_UFS, ino %lu, on dev %s (%d, %d)",
1877 (u_long)ip->i_number, devtoname(ip->i_dev), major(ip->i_dev),
1878 minor(ip->i_dev));
1879 if (vp->v_type == VFIFO)
1880 fifo_printinfo(vp);
1881 lockmgr_printinfo(&vp->v_lock);
1882 kprintf("\n");
1883 return (0);
1884 }
1885
1886 /*
1887 * Read wrapper for special devices.
1888 *
1889 * ufsspec_read(struct vnode *a_vp, struct uio *a_uio, int a_ioflag,
1890 * struct ucred *a_cred)
1891 */
1892 static
1893 int
1894 ufsspec_read(struct vop_read_args *ap)
1895 {
1896 int error, resid;
1897 struct inode *ip;
1898 struct uio *uio;
1899
1900 uio = ap->a_uio;
1901 resid = uio->uio_resid;
1902 error = VOCALL(&spec_vnode_vops, &ap->a_head);
1903 /*
1904 * The inode may have been revoked during the call, so it must not
1905 * be accessed blindly here or in the other wrapper functions.
1906 */
1907 ip = VTOI(ap->a_vp);
1908 if (ip != NULL && (uio->uio_resid != resid || (error == 0 && resid != 0)))
1909 ip->i_flag |= IN_ACCESS;
1910 return (error);
1911 }
1912
1913 /*
1914 * Write wrapper for special devices.
1915 *
1916 * ufsspec_write(struct vnode *a_vp, struct uio *a_uio, int a_ioflag,
1917 * struct ucred *a_cred)
1918 */
1919 static
1920 int
1921 ufsspec_write(struct vop_write_args *ap)
1922 {
1923 int error, resid;
1924 struct inode *ip;
1925 struct uio *uio;
1926
1927 uio = ap->a_uio;
1928 resid = uio->uio_resid;
1929 error = VOCALL(&spec_vnode_vops, &ap->a_head);
1930 ip = VTOI(ap->a_vp);
1931 if (ip != NULL && (uio->uio_resid != resid || (error == 0 && resid != 0)))
1932 VTOI(ap->a_vp)->i_flag |= IN_CHANGE | IN_UPDATE;
1933 return (error);
1934 }
1935
1936 /*
1937 * Close wrapper for special devices.
1938 *
1939 * Update the times on the inode then do device close.
1940 *
1941 * ufsspec_close(struct vnode *a_vp, int a_fflag)
1942 */
1943 static
1944 int
1945 ufsspec_close(struct vop_close_args *ap)
1946 {
1947 struct vnode *vp = ap->a_vp;
1948
1949 if (vp->v_sysref.refcnt > 1)
1950 ufs_itimes(vp);
1951 return (VOCALL(&spec_vnode_vops, &ap->a_head));
1952 }
1953
1954 /*
1955 * Read wrapper for fifos.
1956 *
1957 * ufsfifo_read(struct vnode *a_vp, struct uio *a_uio, int a_ioflag,
1958 * struct ucred *a_cred)
1959 */
1960 static
1961 int
1962 ufsfifo_read(struct vop_read_args *ap)
1963 {
1964 int error, resid;
1965 struct inode *ip;
1966 struct uio *uio;
1967
1968 uio = ap->a_uio;
1969 resid = uio->uio_resid;
1970 error = VOCALL(&fifo_vnode_vops, &ap->a_head);
1971 ip = VTOI(ap->a_vp);
1972 if ((ap->a_vp->v_mount->mnt_flag & MNT_NOATIME) == 0 && ip != NULL &&
1973 (uio->uio_resid != resid || (error == 0 && resid != 0)))
1974 VTOI(ap->a_vp)->i_flag |= IN_ACCESS;
1975 return (error);
1976 }
1977
1978 /*
1979 * Write wrapper for fifos.
1980 *
1981 * ufsfifo_write(struct vnode *a_vp, struct uio *a_uio, int a_ioflag,
1982 * struct ucred *a_cred)
1983 */
1984 static
1985 int
1986 ufsfifo_write(struct vop_write_args *ap)
1987 {
1988 int error, resid;
1989 struct inode *ip;
1990 struct uio *uio;
1991
1992 uio = ap->a_uio;
1993 resid = uio->uio_resid;
1994 error = VOCALL(&fifo_vnode_vops, &ap->a_head);
1995 ip = VTOI(ap->a_vp);
1996 if (ip != NULL && (uio->uio_resid != resid || (error == 0 && resid != 0)))
1997 VTOI(ap->a_vp)->i_flag |= IN_CHANGE | IN_UPDATE;
1998 return (error);
1999 }
2000
2001 /*
2002 * Close wrapper for fifos.
2003 *
2004 * Update the times on the inode then do device close.
2005 *
2006 * ufsfifo_close(struct vnode *a_vp, int a_fflag)
2007 */
2008 static
2009 int
2010 ufsfifo_close(struct vop_close_args *ap)
2011 {
2012 struct vnode *vp = ap->a_vp;
2013
2014 if (vp->v_sysref.refcnt > 1)
2015 ufs_itimes(vp);
2016 return (VOCALL(&fifo_vnode_vops, &ap->a_head));
2017 }
2018
2019 /*
2020 * Kqfilter wrapper for fifos.
2021 *
2022 * Fall through to ufs kqfilter routines if needed
2023 */
2024 static
2025 int
2026 ufsfifo_kqfilter(struct vop_kqfilter_args *ap)
2027 {
2028 int error;
2029
2030 error = VOCALL(&fifo_vnode_vops, &ap->a_head);
2031 if (error)
2032 error = ufs_kqfilter(ap);
2033 return (error);
2034 }
2035
2036 /*
2037 * Return POSIX pathconf information applicable to ufs filesystems.
2038 *
2039 * ufs_pathconf(struct vnode *a_vp, int a_name, int *a_retval)
2040 */
2041 static
2042 int
2043 ufs_pathconf(struct vop_pathconf_args *ap)
2044 {
2045 switch (ap->a_name) {
2046 case _PC_LINK_MAX:
2047 *ap->a_retval = LINK_MAX;
2048 return (0);
2049 case _PC_NAME_MAX:
2050 *ap->a_retval = NAME_MAX;
2051 return (0);
2052 case _PC_PATH_MAX:
2053 *ap->a_retval = PATH_MAX;
2054 return (0);
2055 case _PC_PIPE_BUF:
2056 *ap->a_retval = PIPE_BUF;
2057 return (0);
2058 case _PC_CHOWN_RESTRICTED:
2059 *ap->a_retval = 1;
2060 return (0);
2061 case _PC_NO_TRUNC:
2062 *ap->a_retval = 1;
2063 return (0);
2064 default:
2065 return (EINVAL);
2066 }
2067 /* NOTREACHED */
2068 }
2069
2070 /*
2071 * Advisory record locking support
2072 *
2073 * ufs_advlock(struct vnode *a_vp, caddr_t a_id, int a_op, struct flock *a_fl,
2074 * int a_flags)
2075 */
2076 static
2077 int
2078 ufs_advlock(struct vop_advlock_args *ap)
2079 {
2080 struct inode *ip = VTOI(ap->a_vp);
2081
2082 return (lf_advlock(ap, &(ip->i_lockf), ip->i_size));
2083 }
2084
2085 /*
2086 * Initialize the vnode associated with a new inode, handle aliased
2087 * vnodes.
2088 *
2089 * Make sure directories have their VM object now rather then later,
2090 * saving us from having to check on all the myrid directory VOPs
2091 * that might be executed without a VOP_OPEN being performed.
2092 */
2093 int
2094 ufs_vinit(struct mount *mntp, struct vnode **vpp)
2095 {
2096 struct inode *ip;
2097 struct vnode *vp;
2098 struct timeval tv;
2099
2100 vp = *vpp;
2101 ip = VTOI(vp);
2102
2103 vp->v_type = IFTOVT(ip->i_mode);
2104
2105 switch(vp->v_type) {
2106 case VCHR:
2107 case VBLK:
2108 vp->v_ops = &mntp->mnt_vn_spec_ops;
2109 addaliasu(vp, umajor(ip->i_rdev), uminor(ip->i_rdev));
2110 break;
2111 case VFIFO:
2112 vp->v_ops = &mntp->mnt_vn_fifo_ops;
2113 break;
2114 case VDIR:
2115 case VREG:
2116 vinitvmio(vp, ip->i_size);
2117 break;
2118 case VLNK:
2119 if (ip->i_size >= vp->v_mount->mnt_maxsymlinklen)
2120 vinitvmio(vp, ip->i_size);
2121 break;
2122 default:
2123 break;
2124
2125 }
2126
2127 if (ip->i_number == ROOTINO)
2128 vp->v_flag |= VROOT;
2129 /*
2130 * Initialize modrev times
2131 */
2132 getmicrouptime(&tv);
2133 SETHIGH(ip->i_modrev, tv.tv_sec);
2134 SETLOW(ip->i_modrev, tv.tv_usec * 4294);
2135 *vpp = vp;
2136 return (0);
2137 }
2138
2139 /*
2140 * Allocate a new inode.
2141 */
2142 static
2143 int
2144 ufs_makeinode(int mode, struct vnode *dvp, struct vnode **vpp,
2145 struct componentname *cnp)
2146 {
2147 struct inode *ip, *pdir;
2148 struct direct newdir;
2149 struct vnode *tvp;
2150 int error;
2151
2152 pdir = VTOI(dvp);
2153 *vpp = NULL;
2154 if ((mode & IFMT) == 0)
2155 mode |= IFREG;
2156
2157 error = ffs_valloc(dvp, mode, cnp->cn_cred, &tvp);
2158 if (error)
2159 return (error);
2160 ip = VTOI(tvp);
2161 ip->i_flags = pdir->i_flags & (SF_NOHISTORY|UF_NOHISTORY|UF_NODUMP);
2162 ip->i_gid = pdir->i_gid;
2163 #ifdef SUIDDIR
2164 {
2165 #ifdef QUOTA
2166 struct ucred ucred, *ucp;
2167 ucp = cnp->cn_cred;
2168 #endif
2169 /*
2170 * If we are not the owner of the directory,
2171 * and we are hacking owners here, (only do this where told to)
2172 * and we are not giving it TO root, (would subvert quotas)
2173 * then go ahead and give it to the other user.
2174 * Note that this drops off the execute bits for security.
2175 */
2176 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) &&
2177 (pdir->i_mode & ISUID) &&
2178 (pdir->i_uid != cnp->cn_cred->cr_uid) && pdir->i_uid) {
2179 ip->i_uid = pdir->i_uid;
2180 mode &= ~07111;
2181 #ifdef QUOTA
2182 /*
2183 * Make sure the correct user gets charged
2184 * for the space.
2185 * Quickly knock up a dummy credential for the victim.
2186 * XXX This seems to never be accessed out of our
2187 * context so a stack variable is ok.
2188 */
2189 ucred.cr_ref = 1;
2190 ucred.cr_uid = ip->i_uid;
2191 ucred.cr_ngroups = 1;
2192 ucred.cr_groups[0] = pdir->i_gid;
2193 ucp = &ucred;
2194 #endif
2195 } else
2196 ip->i_uid = cnp->cn_cred->cr_uid;
2197
2198 #ifdef QUOTA
2199 if ((error = ufs_getinoquota(ip)) ||
2200 (error = ufs_chkiq(ip, 1, ucp, 0))) {
2201 ffs_vfree(tvp, ip->i_number, mode);
2202 vput(tvp);
2203 return (error);
2204 }
2205 #endif
2206 }
2207 #else /* !SUIDDIR */
2208 ip->i_uid = cnp->cn_cred->cr_uid;
2209 #ifdef QUOTA
2210 if ((error = ufs_getinoquota(ip)) ||
2211 (error = ufs_chkiq(ip, 1, cnp->cn_cred, 0))) {
2212 ffs_vfree(tvp, ip->i_number, mode);
2213 vput(tvp);
2214 return (error);
2215 }
2216 #endif
2217 #endif /* !SUIDDIR */
2218 ip->i_fsmid = cache_getnewfsmid();
2219 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
2220 ip->i_mode = mode;
2221 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */
2222 ip->i_effnlink = 1;
2223 ip->i_nlink = 1;
2224 if (DOINGSOFTDEP(tvp))
2225 softdep_change_linkcnt(ip);
2226 if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred) &&
2227 suser_cred(cnp->cn_cred, 0)) {
2228 ip->i_mode &= ~ISGID;
2229 }
2230
2231 if (cnp->cn_flags & CNP_ISWHITEOUT)
2232 ip->i_flags |= UF_OPAQUE;
2233
2234 /*
2235 * Regular files and directories need VM objects. Softlinks do
2236 * not (not immediately anyway).
2237 */
2238 if (tvp->v_type == VREG || tvp->v_type == VDIR)
2239 vinitvmio(tvp, 0);
2240
2241 /*
2242 * Make sure inode goes to disk before directory entry.
2243 */
2244 error = ffs_update(tvp, !(DOINGSOFTDEP(tvp) | DOINGASYNC(tvp)));
2245 if (error)
2246 goto bad;
2247 ufs_makedirentry(ip, cnp, &newdir);
2248 error = ufs_direnter(dvp, tvp, &newdir, cnp, NULL);
2249 if (error)
2250 goto bad;
2251 *vpp = tvp;
2252 return (0);
2253
2254 bad:
2255 /*
2256 * Write error occurred trying to update the inode
2257 * or the directory so must deallocate the inode.
2258 */
2259 ip->i_effnlink = 0;
2260 ip->i_nlink = 0;
2261 ip->i_flag |= IN_CHANGE;
2262 if (DOINGSOFTDEP(tvp))
2263 softdep_change_linkcnt(ip);
2264 vput(tvp);
2265 return (error);
2266 }
2267
2268 static int
2269 ufs_missingop(struct vop_generic_args *ap)
2270 {
2271 panic("no vop function for %s in ufs child", ap->a_desc->sd_name);
2272 return (EOPNOTSUPP);
2273 }
2274
2275 static struct filterops ufsread_filtops =
2276 { 1, NULL, filt_ufsdetach, filt_ufsread };
2277 static struct filterops ufswrite_filtops =
2278 { 1, NULL, filt_ufsdetach, filt_ufswrite };
2279 static struct filterops ufsvnode_filtops =
2280 { 1, NULL, filt_ufsdetach, filt_ufsvnode };
2281
2282 /*
2283 * ufs_kqfilter(struct vnode *a_vp, struct knote *a_kn)
2284 */
2285 static int
2286 ufs_kqfilter(struct vop_kqfilter_args *ap)
2287 {
2288 struct vnode *vp = ap->a_vp;
2289 struct knote *kn = ap->a_kn;
2290 lwkt_tokref ilock;
2291
2292 switch (kn->kn_filter) {
2293 case EVFILT_READ:
2294 kn->kn_fop = &ufsread_filtops;
2295 break;
2296 case EVFILT_WRITE:
2297 kn->kn_fop = &ufswrite_filtops;
2298 break;
2299 case EVFILT_VNODE:
2300 kn->kn_fop = &ufsvnode_filtops;
2301 break;
2302 default:
2303 return (1);
2304 }
2305
2306 kn->kn_hook = (caddr_t)vp;
2307
2308 lwkt_gettoken(&ilock, &vp->v_pollinfo.vpi_token);
2309 SLIST_INSERT_HEAD(&vp->v_pollinfo.vpi_selinfo.si_note, kn, kn_selnext);
2310 lwkt_reltoken(&ilock);
2311
2312 return (0);
2313 }
2314
2315 static void
2316 filt_ufsdetach(struct knote *kn)
2317 {
2318 struct vnode *vp = (struct vnode *)kn->kn_hook;
2319 lwkt_tokref ilock;
2320
2321 lwkt_gettoken(&ilock, &vp->v_pollinfo.vpi_token);
2322 SLIST_REMOVE(&vp->v_pollinfo.vpi_selinfo.si_note,
2323 kn, knote, kn_selnext);
2324 lwkt_reltoken(&ilock);
2325 }
2326
2327 /*ARGSUSED*/
2328 static int
2329 filt_ufsread(struct knote *kn, long hint)
2330 {
2331 struct vnode *vp = (struct vnode *)kn->kn_hook;
2332 struct inode *ip = VTOI(vp);
2333
2334 /*
2335 * filesystem is gone, so set the EOF flag and schedule
2336 * the knote for deletion.
2337 */
2338 if (hint == NOTE_REVOKE) {
2339 kn->kn_flags |= (EV_EOF | EV_ONESHOT);
2340 return (1);
2341 }
2342
2343 kn->kn_data = ip->i_size - kn->kn_fp->f_offset;
2344 return (kn->kn_data != 0);
2345 }
2346
2347 /*ARGSUSED*/
2348 static int
2349 filt_ufswrite(struct knote *kn, long hint)
2350 {
2351 /*
2352 * filesystem is gone, so set the EOF flag and schedule
2353 * the knote for deletion.
2354 */
2355 if (hint == NOTE_REVOKE)
2356 kn->kn_flags |= (EV_EOF | EV_ONESHOT);
2357
2358 kn->kn_data = 0;
2359 return (1);
2360 }
2361
2362 static int
2363 filt_ufsvnode(struct knote *kn, long hint)
2364 {
2365 if (kn->kn_sfflags & hint)
2366 kn->kn_fflags |= hint;
2367 if (hint == NOTE_REVOKE) {
2368 kn->kn_flags |= EV_EOF;
2369 return (1);
2370 }
2371 return (kn->kn_fflags != 0);
2372 }
2373
2374 /* Global vfs data structures for ufs. */
2375 static struct vop_ops ufs_vnode_vops = {
2376 .vop_default = vop_defaultop,
2377 .vop_fsync = (void *)ufs_missingop,
2378 .vop_read = (void *)ufs_missingop,
2379 .vop_reallocblks = (void *)ufs_missingop,
2380 .vop_write = (void *)ufs_missingop,
2381 .vop_access = ufs_access,
2382 .vop_advlock = ufs_advlock,
2383 .vop_bmap = ufs_bmap,
2384 .vop_old_lookup = ufs_lookup,
2385 .vop_close = ufs_close,
2386 .vop_old_create = ufs_create,
2387 .vop_getattr = ufs_getattr,
2388 .vop_inactive = ufs_inactive,
2389 .vop_old_link = ufs_link,
2390 .vop_old_mkdir = ufs_mkdir,
2391 .vop_old_mknod = ufs_mknod,
2392 .vop_mmap = ufs_mmap,
2393 .vop_open = ufs_open,
2394 .vop_pathconf = ufs_pathconf,
2395 .vop_poll = vop_stdpoll,
2396 .vop_kqfilter = ufs_kqfilter,
2397 .vop_print = ufs_print,
2398 .vop_readdir = ufs_readdir,
2399 .vop_readlink = ufs_readlink,
2400 .vop_reclaim = ufs_reclaim,
2401 .vop_old_remove = ufs_remove,
2402 .vop_old_rename = ufs_rename,
2403 .vop_old_rmdir = ufs_rmdir,
2404 .vop_setattr = ufs_setattr,
2405 .vop_strategy = ufs_strategy,
2406 .vop_old_symlink = ufs_symlink,
2407 .vop_old_whiteout = ufs_whiteout
2408 };
2409
2410 static struct vop_ops ufs_spec_vops = {
2411 .vop_default = spec_vnoperate,
2412 .vop_fsync = (void *)ufs_missingop,
2413 .vop_access = ufs_access,
2414 .vop_close = ufsspec_close,
2415 .vop_getattr = ufs_getattr,
2416 .vop_inactive = ufs_inactive,
2417 .vop_print = ufs_print,
2418 .vop_read = ufsspec_read,
2419 .vop_reclaim = ufs_reclaim,
2420 .vop_setattr = ufs_setattr,
2421 .vop_write = ufsspec_write
2422 };
2423
2424 static struct vop_ops ufs_fifo_vops = {
2425 .vop_default = fifo_vnoperate,
2426 .vop_fsync = (void *)ufs_missingop,
2427 .vop_access = ufs_access,
2428 .vop_close = ufsfifo_close,
2429 .vop_getattr = ufs_getattr,
2430 .vop_inactive = ufs_inactive,
2431 .vop_kqfilter = ufsfifo_kqfilter,
2432 .vop_print = ufs_print,
2433 .vop_read = ufsfifo_read,
2434 .vop_reclaim = ufs_reclaim,
2435 .vop_setattr = ufs_setattr,
2436 .vop_write = ufsfifo_write
2437 };
2438
2439 VNODEOP_SET(ufs_vnode_vops);
2440 VNODEOP_SET(ufs_spec_vops);
2441 VNODEOP_SET(ufs_fifo_vops);
2442
2443 /*
2444 * ufs_vnoperate()
2445 */
2446 int
2447 ufs_vnoperate(struct vop_generic_args *ap)
2448 {
2449 return (VOCALL(&ufs_vnode_vops, ap));
2450 }
2451
2452 /*
2453 * ufs_vnoperatefifo()
2454 */
2455 int
2456 ufs_vnoperatefifo(struct vop_generic_args *ap)
2457 {
2458 return (VOCALL(&ufs_fifo_vops, ap));
2459 }
2460
2461 /*
2462 * ufs_vnoperatespec()
2463 */
2464 int
2465 ufs_vnoperatespec(struct vop_generic_args *ap)
2466 {
2467 return (VOCALL(&ufs_spec_vops, ap));
2468 }
DragonFly BSD