1 /* $OpenBSD: ufs_vnops.c,v 1.162 2024/05/13 11:17:41 semarie Exp $ */
2 /* $NetBSD: ufs_vnops.c,v 1.18 1996/05/11 18:28:04 mycroft Exp $ */
3
4 /*
5 * Copyright (c) 1982, 1986, 1989, 1993
6 * The Regents of the University of California. All rights reserved.
7 * (c) UNIX System Laboratories, Inc.
8 * All or some portions of this file are derived from material licensed
9 * to the University of California by American Telephone and Telegraph
10 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
11 * the permission of UNIX System Laboratories, Inc.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 *
37 * @(#)ufs_vnops.c 8.14 (Berkeley) 10/26/94
38 */
39
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/namei.h>
43 #include <sys/resourcevar.h>
44 #include <sys/kernel.h>
45 #include <sys/fcntl.h>
46 #include <sys/file.h>
47 #include <sys/stat.h>
48 #include <sys/buf.h>
49 #include <sys/proc.h>
50 #include <sys/mount.h>
51 #include <sys/vnode.h>
52 #include <sys/malloc.h>
53 #include <sys/pool.h>
54 #include <sys/dirent.h>
55 #include <sys/lockf.h>
56 #include <sys/event.h>
57 #include <sys/specdev.h>
58 #include <sys/unistd.h>
59
60 #include <miscfs/fifofs/fifo.h>
61
62 #include <ufs/ufs/quota.h>
63 #include <ufs/ufs/inode.h>
64 #include <ufs/ufs/dir.h>
65 #include <ufs/ufs/ufsmount.h>
66 #include <ufs/ufs/ufs_extern.h>
67 #ifdef UFS_DIRHASH
68 #include <ufs/ufs/dirhash.h>
69 #endif
70 #include <ufs/ext2fs/ext2fs_extern.h>
71
72 #include <uvm/uvm_extern.h>
73
74 int ufs_chmod(struct vnode *, int, struct ucred *);
75 int ufs_chown(struct vnode *, uid_t, gid_t, struct ucred *);
76 int filt_ufsread(struct knote *, long);
77 int filt_ufswrite(struct knote *, long);
78 int filt_ufsvnode(struct knote *, long);
79 void filt_ufsdetach(struct knote *);
80
81 /*
82 * A virgin directory (no blushing please).
83 */
84 static const struct dirtemplate mastertemplate = {
85 0, 12, DT_DIR, 1, ".",
86 0, DIRBLKSIZ - 12, DT_DIR, 2, ".."
87 };
88
89 /*
90 * Update the times in the inode
91 */
92 void
ufs_itimes(struct vnode * vp)93 ufs_itimes(struct vnode *vp)
94 {
95 struct inode *ip;
96 struct timespec ts;
97
98 ip = VTOI(vp);
99 if ((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE)) == 0)
100 return;
101
102 if (vp->v_mount->mnt_flag & MNT_RDONLY)
103 goto out;
104
105 #ifdef EXT2FS
106 if (IS_EXT2_VNODE(ip->i_vnode)) {
107 EXT2FS_ITIMES(ip);
108 goto out;
109 }
110 #endif
111
112 if ((vp->v_type == VBLK || vp->v_type == VCHR))
113 ip->i_flag |= IN_LAZYMOD;
114 else
115 ip->i_flag |= IN_MODIFIED;
116
117 getnanotime(&ts);
118 if (ip->i_flag & IN_ACCESS) {
119 DIP_ASSIGN(ip, atime, ts.tv_sec);
120 DIP_ASSIGN(ip, atimensec, ts.tv_nsec);
121 }
122 if (ip->i_flag & IN_UPDATE) {
123 DIP_ASSIGN(ip, mtime, ts.tv_sec);
124 DIP_ASSIGN(ip, mtimensec, ts.tv_nsec);
125 }
126 if (ip->i_flag & IN_CHANGE) {
127 DIP_ASSIGN(ip, ctime, ts.tv_sec);
128 DIP_ASSIGN(ip, ctimensec, ts.tv_nsec);
129 ip->i_modrev++;
130 }
131
132 out:
133 ip->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE);
134 }
135
136
137 /*
138 * Create a regular file
139 */
140 int
ufs_create(void * v)141 ufs_create(void *v)
142 {
143 struct vop_create_args *ap = v;
144 int error;
145
146 error =
147 ufs_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode),
148 ap->a_dvp, ap->a_vpp, ap->a_cnp);
149 if (error == 0)
150 VN_KNOTE(ap->a_dvp, NOTE_WRITE);
151 return (error);
152 }
153
154 /*
155 * Mknod vnode call
156 */
157 int
ufs_mknod(void * v)158 ufs_mknod(void *v)
159 {
160 struct vop_mknod_args *ap = v;
161 struct vattr *vap = ap->a_vap;
162 struct vnode **vpp = ap->a_vpp;
163 struct inode *ip;
164 int error;
165
166 if ((error =
167 ufs_makeinode(MAKEIMODE(vap->va_type, vap->va_mode),
168 ap->a_dvp, vpp, ap->a_cnp)) != 0)
169 return (error);
170 VN_KNOTE(ap->a_dvp, NOTE_WRITE);
171 ip = VTOI(*vpp);
172 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
173 if (vap->va_rdev != VNOVAL) {
174 /*
175 * Want to be able to use this to make badblock
176 * inodes, so don't truncate the dev number.
177 */
178 DIP_ASSIGN(ip, rdev, vap->va_rdev);
179 }
180 /*
181 * Remove inode so that it will be reloaded by VFS_VGET and
182 * checked to see if it is an alias of an existing entry in
183 * the inode cache.
184 */
185 vput(*vpp);
186 (*vpp)->v_type = VNON;
187 vgone(*vpp);
188 *vpp = NULL;
189 return (0);
190 }
191
192 /*
193 * Open called.
194 *
195 * Nothing to do.
196 */
197 int
ufs_open(void * v)198 ufs_open(void *v)
199 {
200 struct vop_open_args *ap = v;
201 struct inode *ip = VTOI(ap->a_vp);
202
203 /*
204 * Files marked append-only must be opened for appending.
205 */
206 if ((DIP(ip, flags) & APPEND) &&
207 (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE)
208 return (EPERM);
209
210 if (ap->a_mode & O_TRUNC)
211 ip->i_flag |= IN_CHANGE | IN_UPDATE;
212
213 return (0);
214 }
215
216 /*
217 * Close called.
218 *
219 * Update the times on the inode.
220 */
221 int
ufs_close(void * v)222 ufs_close(void *v)
223 {
224 struct vop_close_args *ap = v;
225 struct vnode *vp = ap->a_vp;
226
227 if (vp->v_usecount > 1)
228 ufs_itimes(vp);
229 return (0);
230 }
231
232 int
ufs_access(void * v)233 ufs_access(void *v)
234 {
235 struct vop_access_args *ap = v;
236 struct vnode *vp = ap->a_vp;
237 struct inode *ip = VTOI(vp);
238 mode_t mode = ap->a_mode;
239
240 /*
241 * Disallow write attempts on read-only file systems;
242 * unless the file is a socket, fifo, or a block or
243 * character device resident on the file system.
244 */
245 if (mode & VWRITE) {
246 switch (vp->v_type) {
247 int error;
248 case VDIR:
249 case VLNK:
250 case VREG:
251 if (vp->v_mount->mnt_flag & MNT_RDONLY)
252 return (EROFS);
253
254 if ((error = getinoquota(ip)) != 0)
255 return (error);
256 break;
257 case VBAD:
258 case VBLK:
259 case VCHR:
260 case VSOCK:
261 case VFIFO:
262 case VNON:
263 break;
264
265 }
266 }
267
268 /* If immutable bit set, nobody gets to write it. */
269 if ((mode & VWRITE) && (DIP(ip, flags) & IMMUTABLE))
270 return (EPERM);
271
272 if (vnoperm(vp)) {
273 /* For VEXEC, at least one of the execute bits must be set. */
274 if ((mode & VEXEC) && vp->v_type != VDIR &&
275 (DIP(ip, mode) & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0)
276 return EACCES;
277 return 0;
278 }
279
280 return (vaccess(vp->v_type, DIP(ip, mode), DIP(ip, uid), DIP(ip, gid),
281 mode, ap->a_cred));
282 }
283
284 int
ufs_getattr(void * v)285 ufs_getattr(void *v)
286 {
287 struct vop_getattr_args *ap = v;
288 struct vnode *vp = ap->a_vp;
289 struct inode *ip = VTOI(vp);
290 struct vattr *vap = ap->a_vap;
291
292 ufs_itimes(vp);
293
294 /*
295 * Copy from inode table
296 */
297 vap->va_fsid = ip->i_dev;
298 vap->va_fileid = ip->i_number;
299 vap->va_mode = DIP(ip, mode) & ~IFMT;
300 vap->va_nlink = ip->i_effnlink;
301 vap->va_uid = DIP(ip, uid);
302 vap->va_gid = DIP(ip, gid);
303 vap->va_rdev = (dev_t) DIP(ip, rdev);
304 vap->va_size = DIP(ip, size);
305 vap->va_atime.tv_sec = DIP(ip, atime);
306 vap->va_atime.tv_nsec = DIP(ip, atimensec);
307 vap->va_mtime.tv_sec = DIP(ip, mtime);
308 vap->va_mtime.tv_nsec = DIP(ip, mtimensec);
309 vap->va_ctime.tv_sec = DIP(ip, ctime);
310 vap->va_ctime.tv_nsec = DIP(ip, ctimensec);
311 vap->va_flags = DIP(ip, flags);
312 vap->va_gen = DIP(ip, gen);
313 /* this doesn't belong here */
314 if (vp->v_type == VBLK)
315 vap->va_blocksize = BLKDEV_IOSIZE;
316 else if (vp->v_type == VCHR)
317 vap->va_blocksize = MAXBSIZE;
318 else
319 vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize;
320 vap->va_bytes = dbtob((u_quad_t) DIP(ip, blocks));
321 vap->va_type = vp->v_type;
322 vap->va_filerev = ip->i_modrev;
323 return (0);
324 }
325
326 /*
327 * Set attribute vnode op. called from several syscalls
328 */
329 int
ufs_setattr(void * v)330 ufs_setattr(void *v)
331 {
332 struct vop_setattr_args *ap = v;
333 struct vattr *vap = ap->a_vap;
334 struct vnode *vp = ap->a_vp;
335 struct inode *ip = VTOI(vp);
336 struct ucred *cred = ap->a_cred;
337 int error;
338 long hint = NOTE_ATTRIB;
339 u_quad_t oldsize;
340
341 /*
342 * Check for unsettable attributes.
343 */
344 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
345 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
346 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
347 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
348 return (EINVAL);
349 }
350 if (vap->va_flags != VNOVAL) {
351 if (vp->v_mount->mnt_flag & MNT_RDONLY)
352 return (EROFS);
353 if (cred->cr_uid != DIP(ip, uid) &&
354 !vnoperm(vp) &&
355 (error = suser_ucred(cred)))
356 return (error);
357 if (cred->cr_uid == 0 || vnoperm(vp)) {
358 if ((DIP(ip, flags) & (SF_IMMUTABLE | SF_APPEND)) &&
359 securelevel > 0)
360 return (EPERM);
361 DIP_ASSIGN(ip, flags, vap->va_flags);
362 } else {
363 if (DIP(ip, flags) & (SF_IMMUTABLE | SF_APPEND) ||
364 (vap->va_flags & UF_SETTABLE) != vap->va_flags)
365 return (EPERM);
366 DIP_AND(ip, flags, SF_SETTABLE);
367 DIP_OR(ip, flags, vap->va_flags & UF_SETTABLE);
368 }
369 ip->i_flag |= IN_CHANGE;
370 if (vap->va_flags & (IMMUTABLE | APPEND))
371 return (0);
372 }
373 if (DIP(ip, flags) & (IMMUTABLE | APPEND))
374 return (EPERM);
375 /*
376 * Go through the fields and update if not VNOVAL.
377 */
378 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
379 if (vp->v_mount->mnt_flag & MNT_RDONLY)
380 return (EROFS);
381 error = ufs_chown(vp, vap->va_uid, vap->va_gid, cred);
382 if (error)
383 return (error);
384 }
385 if (vap->va_size != VNOVAL) {
386 oldsize = DIP(ip, size);
387 /*
388 * Disallow write attempts on read-only file systems;
389 * unless the file is a socket, fifo, or a block or
390 * character device resident on the file system.
391 */
392 switch (vp->v_type) {
393 case VDIR:
394 return (EISDIR);
395 case VLNK:
396 case VREG:
397 if (vp->v_mount->mnt_flag & MNT_RDONLY)
398 return (EROFS);
399 break;
400 default:
401 break;
402 }
403 if ((error = UFS_TRUNCATE(ip, vap->va_size, 0, cred)) != 0)
404 return (error);
405 if (vap->va_size < oldsize)
406 hint |= NOTE_TRUNCATE;
407 }
408 if ((vap->va_vaflags & VA_UTIMES_CHANGE) ||
409 vap->va_atime.tv_nsec != VNOVAL ||
410 vap->va_mtime.tv_nsec != VNOVAL) {
411 if (vp->v_mount->mnt_flag & MNT_RDONLY)
412 return (EROFS);
413 if (cred->cr_uid != DIP(ip, uid) &&
414 !vnoperm(vp) &&
415 (error = suser_ucred(cred)) &&
416 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
417 (error = VOP_ACCESS(vp, VWRITE, cred, ap->a_p))))
418 return (error);
419 if (vap->va_mtime.tv_nsec != VNOVAL)
420 ip->i_flag |= IN_CHANGE | IN_UPDATE;
421 else if (vap->va_vaflags & VA_UTIMES_CHANGE)
422 ip->i_flag |= IN_CHANGE;
423 if (vap->va_atime.tv_nsec != VNOVAL) {
424 if (!(vp->v_mount->mnt_flag & MNT_NOATIME) ||
425 (ip->i_flag & (IN_CHANGE | IN_UPDATE)))
426 ip->i_flag |= IN_ACCESS;
427 }
428 ufs_itimes(vp);
429 if (vap->va_mtime.tv_nsec != VNOVAL) {
430 DIP_ASSIGN(ip, mtime, vap->va_mtime.tv_sec);
431 DIP_ASSIGN(ip, mtimensec, vap->va_mtime.tv_nsec);
432 }
433 if (vap->va_atime.tv_nsec != VNOVAL) {
434 DIP_ASSIGN(ip, atime, vap->va_atime.tv_sec);
435 DIP_ASSIGN(ip, atimensec, vap->va_atime.tv_nsec);
436 }
437 error = UFS_UPDATE(ip, 0);
438 if (error)
439 return (error);
440 }
441 error = 0;
442 if (vap->va_mode != (mode_t)VNOVAL) {
443 if (vp->v_mount->mnt_flag & MNT_RDONLY)
444 return (EROFS);
445 error = ufs_chmod(vp, (int)vap->va_mode, cred);
446 }
447 VN_KNOTE(vp, hint);
448 return (error);
449 }
450
451 /*
452 * Change the mode on a file.
453 * Inode must be locked before calling.
454 */
455 int
ufs_chmod(struct vnode * vp,int mode,struct ucred * cred)456 ufs_chmod(struct vnode *vp, int mode, struct ucred *cred)
457 {
458 struct inode *ip = VTOI(vp);
459 int error;
460
461 if (cred->cr_uid != DIP(ip, uid) &&
462 !vnoperm(vp) &&
463 (error = suser_ucred(cred)))
464 return (error);
465 if (cred->cr_uid && !vnoperm(vp)) {
466 if (vp->v_type != VDIR && (mode & S_ISTXT))
467 return (EFTYPE);
468 if (!groupmember(DIP(ip, gid), cred) && (mode & ISGID))
469 return (EPERM);
470 }
471 DIP_AND(ip, mode, ~ALLPERMS);
472 DIP_OR(ip, mode, mode & ALLPERMS);
473 ip->i_flag |= IN_CHANGE;
474 if ((vp->v_flag & VTEXT) && (DIP(ip, mode) & S_ISTXT) == 0)
475 (void) uvm_vnp_uncache(vp);
476 return (0);
477 }
478
479 /*
480 * Perform chown operation on inode ip;
481 * inode must be locked prior to call.
482 */
483 int
ufs_chown(struct vnode * vp,uid_t uid,gid_t gid,struct ucred * cred)484 ufs_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred)
485 {
486 struct inode *ip = VTOI(vp);
487 uid_t ouid;
488 gid_t ogid;
489 int error = 0;
490 daddr_t change;
491 enum ufs_quota_flags quota_flags = 0;
492
493 if (uid == (uid_t)VNOVAL)
494 uid = DIP(ip, uid);
495 if (gid == (gid_t)VNOVAL)
496 gid = DIP(ip, gid);
497 /*
498 * If we don't own the file, are trying to change the owner
499 * of the file, or are not a member of the target group,
500 * the caller must be superuser or the call fails.
501 */
502 if ((cred->cr_uid != DIP(ip, uid) || uid != DIP(ip, uid) ||
503 (gid != DIP(ip, gid) && !groupmember(gid, cred))) &&
504 !vnoperm(vp) &&
505 (error = suser_ucred(cred)))
506 return (error);
507 ogid = DIP(ip, gid);
508 ouid = DIP(ip, uid);
509 change = DIP(ip, blocks);
510
511 if (ouid == uid)
512 quota_flags |= UFS_QUOTA_NOUID;
513
514 if (ogid == gid)
515 quota_flags |= UFS_QUOTA_NOGID;
516
517 if ((error = getinoquota(ip)) != 0)
518 return (error);
519 (void) ufs_quota_free_blocks2(ip, change, cred, quota_flags);
520 (void) ufs_quota_free_inode2(ip, cred, quota_flags);
521 (void) ufs_quota_delete(ip);
522
523 DIP_ASSIGN(ip, gid, gid);
524 DIP_ASSIGN(ip, uid, uid);
525
526 if ((error = getinoquota(ip)) != 0)
527 goto error;
528
529 if ((error = ufs_quota_alloc_blocks2(ip, change, cred,
530 quota_flags)) != 0)
531 goto error;
532
533 if ((error = ufs_quota_alloc_inode2(ip, cred ,
534 quota_flags)) != 0) {
535 (void)ufs_quota_free_blocks2(ip, change, cred,
536 quota_flags);
537 goto error;
538 }
539
540 if (getinoquota(ip))
541 panic("chown: lost quota");
542
543 if (ouid != uid || ogid != gid)
544 ip->i_flag |= IN_CHANGE;
545 if (!vnoperm(vp)) {
546 if (ouid != uid && cred->cr_uid != 0)
547 DIP_AND(ip, mode, ~ISUID);
548 if (ogid != gid && cred->cr_uid != 0)
549 DIP_AND(ip, mode, ~ISGID);
550 }
551 return (0);
552
553 error:
554 (void) ufs_quota_delete(ip);
555
556 DIP_ASSIGN(ip, gid, ogid);
557 DIP_ASSIGN(ip, uid, ouid);
558
559 if (getinoquota(ip) == 0) {
560 (void) ufs_quota_alloc_blocks2(ip, change, cred,
561 quota_flags | UFS_QUOTA_FORCE);
562 (void) ufs_quota_alloc_inode2(ip, cred,
563 quota_flags | UFS_QUOTA_FORCE);
564 (void) getinoquota(ip);
565 }
566 return (error);
567
568 }
569
570 int
ufs_ioctl(void * v)571 ufs_ioctl(void *v)
572 {
573 #if 0
574 struct vop_ioctl_args *ap = v;
575 #endif
576 return (ENOTTY);
577 }
578
579 int
ufs_remove(void * v)580 ufs_remove(void *v)
581 {
582 struct vop_remove_args *ap = v;
583 struct inode *ip;
584 struct vnode *vp = ap->a_vp;
585 struct vnode *dvp = ap->a_dvp;
586 int error;
587
588 ip = VTOI(vp);
589 if (vp->v_type == VDIR || (DIP(ip, flags) & (IMMUTABLE | APPEND)) ||
590 (DIP(VTOI(dvp), flags) & APPEND)) {
591 error = EPERM;
592 goto out;
593 }
594 error = ufs_dirremove(dvp, ip, ap->a_cnp->cn_flags, 0);
595 VN_KNOTE(vp, NOTE_DELETE);
596 VN_KNOTE(dvp, NOTE_WRITE);
597 out:
598 return (error);
599 }
600
601 /*
602 * link vnode call
603 */
604 int
ufs_link(void * v)605 ufs_link(void *v)
606 {
607 struct vop_link_args *ap = v;
608 struct vnode *dvp = ap->a_dvp;
609 struct vnode *vp = ap->a_vp;
610 struct componentname *cnp = ap->a_cnp;
611 struct inode *ip;
612 struct direct newdir;
613 int error;
614
615 #ifdef DIAGNOSTIC
616 if ((cnp->cn_flags & HASBUF) == 0)
617 panic("ufs_link: no name");
618 #endif
619 if (dvp != vp && (error = vn_lock(vp, LK_EXCLUSIVE))) {
620 VOP_ABORTOP(dvp, cnp);
621 goto out2;
622 }
623 ip = VTOI(vp);
624 if ((nlink_t) DIP(ip, nlink) >= LINK_MAX) {
625 VOP_ABORTOP(dvp, cnp);
626 error = EMLINK;
627 goto out1;
628 }
629 if (DIP(ip, flags) & (IMMUTABLE | APPEND)) {
630 VOP_ABORTOP(dvp, cnp);
631 error = EPERM;
632 goto out1;
633 }
634 ip->i_effnlink++;
635 DIP_ADD(ip, nlink, 1);
636 ip->i_flag |= IN_CHANGE;
637 if ((error = UFS_UPDATE(ip, 1)) == 0) {
638 ufs_makedirentry(ip, cnp, &newdir);
639 error = ufs_direnter(dvp, vp, &newdir, cnp, NULL);
640 }
641 if (error) {
642 ip->i_effnlink--;
643 DIP_ADD(ip, nlink, -1);
644 ip->i_flag |= IN_CHANGE;
645 }
646 pool_put(&namei_pool, cnp->cn_pnbuf);
647 VN_KNOTE(vp, NOTE_LINK);
648 VN_KNOTE(dvp, NOTE_WRITE);
649 out1:
650 if (dvp != vp)
651 VOP_UNLOCK(vp);
652 out2:
653 vput(dvp);
654 return (error);
655 }
656
657 /*
658 * Rename system call.
659 * rename("foo", "bar");
660 * is essentially
661 * unlink("bar");
662 * link("foo", "bar");
663 * unlink("foo");
664 * but ``atomically''. Can't do full commit without saving state in the
665 * inode on disk which isn't feasible at this time. Best we can do is
666 * always guarantee the target exists.
667 *
668 * Basic algorithm is:
669 *
670 * 1) Bump link count on source while we're linking it to the
671 * target. This also ensure the inode won't be deleted out
672 * from underneath us while we work (it may be truncated by
673 * a concurrent `trunc' or `open' for creation).
674 * 2) Link source to destination. If destination already exists,
675 * delete it first.
676 * 3) Unlink source reference to inode if still around. If a
677 * directory was moved and the parent of the destination
678 * is different from the source, patch the ".." entry in the
679 * directory.
680 */
681 int
ufs_rename(void * v)682 ufs_rename(void *v)
683 {
684 struct vop_rename_args *ap = v;
685 struct vnode *tvp = ap->a_tvp;
686 struct vnode *tdvp = ap->a_tdvp;
687 struct vnode *fvp = ap->a_fvp;
688 struct vnode *fdvp = ap->a_fdvp;
689 struct componentname *tcnp = ap->a_tcnp;
690 struct componentname *fcnp = ap->a_fcnp;
691 struct inode *ip, *xp, *dp;
692 struct direct newdir;
693 int doingdirectory = 0, oldparent = 0, newparent = 0;
694 int error = 0;
695
696 #ifdef DIAGNOSTIC
697 if ((tcnp->cn_flags & HASBUF) == 0 ||
698 (fcnp->cn_flags & HASBUF) == 0)
699 panic("ufs_rename: no name");
700 #endif
701 /*
702 * Check for cross-device rename.
703 */
704 if ((fvp->v_mount != tdvp->v_mount) ||
705 (tvp && (fvp->v_mount != tvp->v_mount))) {
706 error = EXDEV;
707 abortit:
708 VOP_ABORTOP(tdvp, tcnp);
709 if (tdvp == tvp)
710 vrele(tdvp);
711 else
712 vput(tdvp);
713 if (tvp)
714 vput(tvp);
715 VOP_ABORTOP(fdvp, fcnp);
716 vrele(fdvp);
717 vrele(fvp);
718 return (error);
719 }
720
721 if (tvp && ((DIP(VTOI(tvp), flags) & (IMMUTABLE | APPEND)) ||
722 (DIP(VTOI(tdvp), flags) & APPEND))) {
723 error = EPERM;
724 goto abortit;
725 }
726
727 /*
728 * Check if just deleting a link name or if we've lost a race.
729 * If another process completes the same rename after we've looked
730 * up the source and have blocked looking up the target, then the
731 * source and target inodes may be identical now although the
732 * names were never linked.
733 */
734 if (fvp == tvp) {
735 if (fvp->v_type == VDIR) {
736 /*
737 * Linked directories are impossible, so we must
738 * have lost the race. Pretend that the rename
739 * completed before the lookup.
740 */
741 error = ENOENT;
742 goto abortit;
743 }
744
745 /* Release destination completely. */
746 VOP_ABORTOP(tdvp, tcnp);
747 vput(tdvp);
748 vput(tvp);
749
750 /*
751 * Delete source. There is another race now that everything
752 * is unlocked, but this doesn't cause any new complications.
753 * relookup() may find a file that is unrelated to the
754 * original one, or it may fail. Too bad.
755 */
756 vrele(fvp);
757 fcnp->cn_flags &= ~MODMASK;
758 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
759 if ((fcnp->cn_flags & SAVESTART) == 0)
760 panic("ufs_rename: lost from startdir");
761 fcnp->cn_nameiop = DELETE;
762 if ((error = vfs_relookup(fdvp, &fvp, fcnp)) != 0)
763 return (error); /* relookup did vrele() */
764 vrele(fdvp);
765 return (VOP_REMOVE(fdvp, fvp, fcnp));
766 }
767
768 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0)
769 goto abortit;
770
771 /* fvp, tdvp, tvp now locked */
772 dp = VTOI(fdvp);
773 ip = VTOI(fvp);
774 if ((nlink_t) DIP(ip, nlink) >= LINK_MAX) {
775 VOP_UNLOCK(fvp);
776 error = EMLINK;
777 goto abortit;
778 }
779 if ((DIP(ip, flags) & (IMMUTABLE | APPEND)) ||
780 (DIP(dp, flags) & APPEND)) {
781 VOP_UNLOCK(fvp);
782 error = EPERM;
783 goto abortit;
784 }
785 if ((DIP(ip, mode) & IFMT) == IFDIR) {
786 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_proc);
787 if (!error && tvp)
788 error = VOP_ACCESS(tvp, VWRITE, tcnp->cn_cred, tcnp->cn_proc);
789 if (error) {
790 VOP_UNLOCK(fvp);
791 error = EACCES;
792 goto abortit;
793 }
794 /*
795 * Avoid ".", "..", and aliases of "." for obvious reasons.
796 */
797 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
798 dp == ip ||
799 (fcnp->cn_flags & ISDOTDOT) ||
800 (tcnp->cn_flags & ISDOTDOT) ||
801 (ip->i_flag & IN_RENAME)) {
802 VOP_UNLOCK(fvp);
803 error = EINVAL;
804 goto abortit;
805 }
806 ip->i_flag |= IN_RENAME;
807 oldparent = dp->i_number;
808 doingdirectory = 1;
809 }
810 VN_KNOTE(fdvp, NOTE_WRITE); /* XXX right place? */
811
812 /*
813 * When the target exists, both the directory
814 * and target vnodes are returned locked.
815 */
816 dp = VTOI(tdvp);
817 xp = NULL;
818 if (tvp)
819 xp = VTOI(tvp);
820
821 /*
822 * 1) Bump link count while we're moving stuff
823 * around. If we crash somewhere before
824 * completing our work, the link count
825 * may be wrong, but correctable.
826 */
827 ip->i_effnlink++;
828 DIP_ADD(ip, nlink, 1);
829 ip->i_flag |= IN_CHANGE;
830 if ((error = UFS_UPDATE(ip, 1)) != 0) {
831 VOP_UNLOCK(fvp);
832 goto bad;
833 }
834
835 /*
836 * If ".." must be changed (ie the directory gets a new
837 * parent) then the source directory must not be in the
838 * directory hierarchy above the target, as this would
839 * orphan everything below the source directory. Also
840 * the user must have write permission in the source so
841 * as to be able to change "..". We must repeat the call
842 * to namei, as the parent directory is unlocked by the
843 * call to checkpath().
844 */
845 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_proc);
846 VOP_UNLOCK(fvp);
847
848 /* tdvp and tvp locked */
849 if (oldparent != dp->i_number)
850 newparent = dp->i_number;
851 if (doingdirectory && newparent) {
852 if (error) /* write access check above */
853 goto bad;
854 if (xp != NULL)
855 vput(tvp);
856 /*
857 * Compensate for the reference ufs_checkpath() loses.
858 */
859 vref(tdvp);
860 /* Only tdvp is locked */
861 if ((error = ufs_checkpath(ip, dp, tcnp->cn_cred)) != 0) {
862 vrele(tdvp);
863 goto out;
864 }
865 if ((tcnp->cn_flags & SAVESTART) == 0)
866 panic("ufs_rename: lost to startdir");
867 if ((error = vfs_relookup(tdvp, &tvp, tcnp)) != 0)
868 goto out;
869 vrele(tdvp); /* relookup() acquired a reference */
870 dp = VTOI(tdvp);
871 xp = NULL;
872 if (tvp)
873 xp = VTOI(tvp);
874 }
875 /*
876 * 2) If target doesn't exist, link the target
877 * to the source and unlink the source.
878 * Otherwise, rewrite the target directory
879 * entry to reference the source inode and
880 * expunge the original entry's existence.
881 */
882 if (xp == NULL) {
883 if (dp->i_dev != ip->i_dev)
884 panic("rename: EXDEV");
885 /*
886 * Account for ".." in new directory.
887 * When source and destination have the same
888 * parent we don't fool with the link count.
889 */
890 if (doingdirectory && newparent) {
891 if ((nlink_t) DIP(dp, nlink) >= LINK_MAX) {
892 error = EMLINK;
893 goto bad;
894 }
895 dp->i_effnlink++;
896 DIP_ADD(dp, nlink, 1);
897 dp->i_flag |= IN_CHANGE;
898 if ((error = UFS_UPDATE(dp, 1))
899 != 0) {
900 dp->i_effnlink--;
901 DIP_ADD(dp, nlink, -1);
902 dp->i_flag |= IN_CHANGE;
903 goto bad;
904 }
905 }
906 ufs_makedirentry(ip, tcnp, &newdir);
907 if ((error = ufs_direnter(tdvp, NULL, &newdir, tcnp, NULL)) != 0) {
908 if (doingdirectory && newparent) {
909 dp->i_effnlink--;
910 DIP_ADD(dp, nlink, -1);
911 dp->i_flag |= IN_CHANGE;
912 (void)UFS_UPDATE(dp, 1);
913 }
914 goto bad;
915 }
916 VN_KNOTE(tdvp, NOTE_WRITE);
917 vput(tdvp);
918 } else {
919 if (xp->i_dev != dp->i_dev || xp->i_dev != ip->i_dev)
920 panic("rename: EXDEV");
921 /*
922 * Short circuit rename(foo, foo).
923 */
924 if (xp->i_number == ip->i_number)
925 panic("ufs_rename: same file");
926 /*
927 * If the parent directory is "sticky", then the user must
928 * own the parent directory, or the destination of the rename,
929 * otherwise the destination may not be changed (except by
930 * root). This implements append-only directories.
931 */
932 if ((DIP(dp, mode) & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 &&
933 tcnp->cn_cred->cr_uid != DIP(dp, uid) &&
934 DIP(xp, uid )!= tcnp->cn_cred->cr_uid &&
935 !vnoperm(tdvp)) {
936 error = EPERM;
937 goto bad;
938 }
939 /*
940 * Target must be empty if a directory and have no links
941 * to it. Also, ensure source and target are compatible
942 * (both directories, or both not directories).
943 */
944 if ((DIP(xp, mode) & IFMT) == IFDIR) {
945 if (xp->i_effnlink > 2 ||
946 !ufs_dirempty(xp, dp->i_number, tcnp->cn_cred)) {
947 error = ENOTEMPTY;
948 goto bad;
949 }
950 if (!doingdirectory) {
951 error = ENOTDIR;
952 goto bad;
953 }
954 cache_purge(tdvp);
955 } else if (doingdirectory) {
956 error = EISDIR;
957 goto bad;
958 }
959
960 if ((error = ufs_dirrewrite(dp, xp, ip->i_number,
961 IFTODT(DIP(ip, mode)), (doingdirectory && newparent) ?
962 newparent : doingdirectory)) != 0)
963 goto bad;
964 if (doingdirectory) {
965 if (!newparent) {
966 dp->i_effnlink--;
967 }
968 xp->i_effnlink--;
969 }
970 if (doingdirectory) {
971 /*
972 * Truncate inode. The only stuff left in the directory
973 * is "." and "..". The "." reference is inconsequential
974 * since we are quashing it. We have removed the "."
975 * reference and the reference in the parent directory,
976 * but there may be other hard links. The soft
977 * dependency code will arrange to do these operations
978 * after the parent directory entry has been deleted on
979 * disk, so when running with that code we avoid doing
980 * them now.
981 */
982 if (!newparent) {
983 DIP_ADD(dp, nlink, -1);
984 dp->i_flag |= IN_CHANGE;
985 }
986
987 DIP_ADD(xp, nlink, -1);
988 xp->i_flag |= IN_CHANGE;
989 if ((error = UFS_TRUNCATE(VTOI(tvp), (off_t)0, IO_SYNC,
990 tcnp->cn_cred)) != 0)
991 goto bad;
992 }
993 VN_KNOTE(tdvp, NOTE_WRITE);
994 vput(tdvp);
995 VN_KNOTE(tvp, NOTE_DELETE);
996 vput(tvp);
997 xp = NULL;
998 }
999
1000 /*
1001 * 3) Unlink the source.
1002 */
1003 fcnp->cn_flags &= ~MODMASK;
1004 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
1005 if ((fcnp->cn_flags & SAVESTART) == 0)
1006 panic("ufs_rename: lost from startdir");
1007 if ((error = vfs_relookup(fdvp, &fvp, fcnp)) != 0) {
1008 vrele(ap->a_fvp);
1009 return (error);
1010 }
1011 vrele(fdvp);
1012 if (fvp == NULL) {
1013 /*
1014 * From name has disappeared.
1015 */
1016 if (doingdirectory)
1017 panic("ufs_rename: lost dir entry");
1018 vrele(ap->a_fvp);
1019 return (0);
1020 }
1021
1022 xp = VTOI(fvp);
1023 dp = VTOI(fdvp);
1024
1025 /*
1026 * Ensure that the directory entry still exists and has not
1027 * changed while the new name has been entered. If the source is
1028 * a file then the entry may have been unlinked or renamed. In
1029 * either case there is no further work to be done. If the source
1030 * is a directory then it cannot have been rmdir'ed; the IN_RENAME
1031 * flag ensures that it cannot be moved by another rename or removed
1032 * by a rmdir.
1033 */
1034 if (xp != ip) {
1035 if (doingdirectory)
1036 panic("ufs_rename: lost dir entry");
1037 } else {
1038 /*
1039 * If the source is a directory with a
1040 * new parent, the link count of the old
1041 * parent directory must be decremented
1042 * and ".." set to point to the new parent.
1043 */
1044 if (doingdirectory && newparent) {
1045 xp->i_offset = mastertemplate.dot_reclen;
1046 ufs_dirrewrite(xp, dp, newparent, DT_DIR, 0);
1047 cache_purge(fdvp);
1048 }
1049 error = ufs_dirremove(fdvp, xp, fcnp->cn_flags, 0);
1050 xp->i_flag &= ~IN_RENAME;
1051 }
1052 VN_KNOTE(fvp, NOTE_RENAME);
1053 if (dp)
1054 vput(fdvp);
1055 if (xp)
1056 vput(fvp);
1057 vrele(ap->a_fvp);
1058 return (error);
1059
1060 bad:
1061 if (xp)
1062 vput(ITOV(xp));
1063 vput(ITOV(dp));
1064 out:
1065 vrele(fdvp);
1066 if (doingdirectory)
1067 ip->i_flag &= ~IN_RENAME;
1068 if (vn_lock(fvp, LK_EXCLUSIVE) == 0) {
1069 ip->i_effnlink--;
1070 DIP_ADD(ip, nlink, -1);
1071 ip->i_flag |= IN_CHANGE;
1072 ip->i_flag &= ~IN_RENAME;
1073 vput(fvp);
1074 } else
1075 vrele(fvp);
1076 return (error);
1077 }
1078
1079 /*
1080 * Mkdir system call
1081 */
1082 int
ufs_mkdir(void * v)1083 ufs_mkdir(void *v)
1084 {
1085 struct vop_mkdir_args *ap = v;
1086 struct vnode *dvp = ap->a_dvp;
1087 struct vattr *vap = ap->a_vap;
1088 struct componentname *cnp = ap->a_cnp;
1089 struct inode *ip, *dp;
1090 struct vnode *tvp;
1091 struct buf *bp;
1092 struct direct newdir;
1093 struct dirtemplate dirtemplate;
1094 int error, dmode;
1095
1096 #ifdef DIAGNOSTIC
1097 if ((cnp->cn_flags & HASBUF) == 0)
1098 panic("ufs_mkdir: no name");
1099 #endif
1100 dp = VTOI(dvp);
1101 if ((nlink_t) DIP(dp, nlink) >= LINK_MAX) {
1102 error = EMLINK;
1103 goto out;
1104 }
1105 dmode = vap->va_mode & 0777;
1106 dmode |= IFDIR;
1107 /*
1108 * Must simulate part of ufs_makeinode here to acquire the inode,
1109 * but not have it entered in the parent directory. The entry is
1110 * made later after writing "." and ".." entries.
1111 */
1112 if ((error = UFS_INODE_ALLOC(dp, dmode, cnp->cn_cred, &tvp)) != 0)
1113 goto out;
1114
1115 ip = VTOI(tvp);
1116
1117 DIP_ASSIGN(ip, uid, cnp->cn_cred->cr_uid);
1118 DIP_ASSIGN(ip, gid, DIP(dp, gid));
1119
1120 if ((error = getinoquota(ip)) ||
1121 (error = ufs_quota_alloc_inode(ip, cnp->cn_cred))) {
1122 pool_put(&namei_pool, cnp->cn_pnbuf);
1123 UFS_INODE_FREE(ip, ip->i_number, dmode);
1124 vput(tvp);
1125 vput(dvp);
1126 return (error);
1127 }
1128
1129 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
1130 DIP_ASSIGN(ip, mode, dmode);
1131 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */
1132 ip->i_effnlink = 2;
1133 DIP_ASSIGN(ip, nlink, 2);
1134
1135 /*
1136 * Bump link count in parent directory to reflect work done below.
1137 * Should be done before reference is create so cleanup is
1138 * possible if we crash.
1139 */
1140 dp->i_effnlink++;
1141 DIP_ADD(dp, nlink, 1);
1142 dp->i_flag |= IN_CHANGE;
1143 if ((error = UFS_UPDATE(dp, 1)) != 0)
1144 goto bad;
1145
1146 /*
1147 * Initialize directory with "." and ".." from static template.
1148 */
1149 dirtemplate = mastertemplate;
1150 dirtemplate.dot_ino = ip->i_number;
1151 dirtemplate.dotdot_ino = dp->i_number;
1152
1153 if ((error = UFS_BUF_ALLOC(ip, (off_t)0, DIRBLKSIZ, cnp->cn_cred,
1154 B_CLRBUF, &bp)) != 0)
1155 goto bad;
1156 DIP_ASSIGN(ip, size, DIRBLKSIZ);
1157 ip->i_flag |= IN_CHANGE | IN_UPDATE;
1158 uvm_vnp_setsize(tvp, DIP(ip, size));
1159 memcpy(bp->b_data, &dirtemplate, sizeof(dirtemplate));
1160 if ((error = UFS_UPDATE(ip, 1)) != 0) {
1161 (void)VOP_BWRITE(bp);
1162 goto bad;
1163 }
1164
1165 /*
1166 * Directory set up, now install its entry in the parent directory.
1167 *
1168 * If we are not doing soft dependencies, then we must write out the
1169 * buffer containing the new directory body before entering the new
1170 * name in the parent. If we are doing soft dependencies, then the
1171 * buffer containing the new directory body will be passed to and
1172 * released in the soft dependency code after the code has attached
1173 * an appropriate ordering dependency to the buffer which ensures that
1174 * the buffer is written before the new name is written in the parent.
1175 */
1176 if ((error = VOP_BWRITE(bp)) != 0)
1177 goto bad;
1178 ufs_makedirentry(ip, cnp, &newdir);
1179 error = ufs_direnter(dvp, tvp, &newdir, cnp, bp);
1180
1181 bad:
1182 if (error == 0) {
1183 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK);
1184 *ap->a_vpp = tvp;
1185 } else {
1186 dp->i_effnlink--;
1187 DIP_ADD(dp, nlink, -1);
1188 dp->i_flag |= IN_CHANGE;
1189 /*
1190 * No need to do an explicit VOP_TRUNCATE here, vrele will
1191 * do this for us because we set the link count to 0.
1192 */
1193 ip->i_effnlink = 0;
1194 DIP_ASSIGN(ip, nlink, 0);
1195 ip->i_flag |= IN_CHANGE;
1196 vput(tvp);
1197 }
1198 out:
1199 pool_put(&namei_pool, cnp->cn_pnbuf);
1200 vput(dvp);
1201
1202 return (error);
1203 }
1204
1205 /*
1206 * Rmdir system call.
1207 */
1208 int
ufs_rmdir(void * v)1209 ufs_rmdir(void *v)
1210 {
1211 struct vop_rmdir_args *ap = v;
1212 struct vnode *vp = ap->a_vp;
1213 struct vnode *dvp = ap->a_dvp;
1214 struct componentname *cnp = ap->a_cnp;
1215 struct inode *ip, *dp;
1216 int error;
1217
1218 ip = VTOI(vp);
1219 dp = VTOI(dvp);
1220 /*
1221 * Do not remove a directory that is in the process of being renamed.
1222 * Verify the directory is empty (and valid). Rmdir ".." will not be
1223 * valid since ".." will contain a reference to the current directory
1224 * and thus be non-empty.
1225 */
1226 error = 0;
1227 if (ip->i_flag & IN_RENAME) {
1228 error = EINVAL;
1229 goto out;
1230 }
1231 if (ip->i_effnlink != 2 ||
1232 !ufs_dirempty(ip, dp->i_number, cnp->cn_cred)) {
1233 error = ENOTEMPTY;
1234 goto out;
1235 }
1236 if ((DIP(dp, flags) & APPEND) ||
1237 (DIP(ip, flags) & (IMMUTABLE | APPEND))) {
1238 error = EPERM;
1239 goto out;
1240 }
1241 /*
1242 * Delete reference to directory before purging
1243 * inode. If we crash in between, the directory
1244 * will be reattached to lost+found,
1245 */
1246 dp->i_effnlink--;
1247 ip->i_effnlink--;
1248 if ((error = ufs_dirremove(dvp, ip, cnp->cn_flags, 1)) != 0) {
1249 dp->i_effnlink++;
1250 ip->i_effnlink++;
1251 goto out;
1252 }
1253
1254 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK);
1255 cache_purge(dvp);
1256 /*
1257 * Truncate inode. The only stuff left in the directory is "." and
1258 * "..". The "." reference is inconsequential since we are quashing
1259 * it.
1260 */
1261 DIP_ADD(dp, nlink, -1);
1262 dp->i_flag |= IN_CHANGE;
1263 DIP_ADD(ip, nlink, -1);
1264 ip->i_flag |= IN_CHANGE;
1265 error = UFS_TRUNCATE(ip, (off_t)0, DOINGASYNC(vp) ? 0 : IO_SYNC,
1266 cnp->cn_cred);
1267
1268 cache_purge(vp);
1269 #ifdef UFS_DIRHASH
1270 /* Kill any active hash; i_effnlink == 0, so it will not come back. */
1271 if (ip->i_dirhash != NULL)
1272 ufsdirhash_free(ip);
1273 #endif
1274
1275 out:
1276 VN_KNOTE(vp, NOTE_DELETE);
1277 vput(dvp);
1278 vput(vp);
1279 return (error);
1280 }
1281
1282 /*
1283 * symlink -- make a symbolic link
1284 */
1285 int
ufs_symlink(void * v)1286 ufs_symlink(void *v)
1287 {
1288 struct vop_symlink_args *ap = v;
1289 struct vnode *vp, **vpp = ap->a_vpp;
1290 struct inode *ip;
1291 int len, error;
1292
1293 error = ufs_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp,
1294 vpp, ap->a_cnp);
1295 if (error) {
1296 vput(ap->a_dvp);
1297 return (error);
1298 }
1299 VN_KNOTE(ap->a_dvp, NOTE_WRITE);
1300 vput(ap->a_dvp);
1301 vp = *vpp;
1302 ip = VTOI(vp);
1303 len = strlen(ap->a_target);
1304 if (len < ip->i_ump->um_maxsymlinklen) {
1305 memcpy(SHORTLINK(ip), ap->a_target, len);
1306 DIP_ASSIGN(ip, size, len);
1307 ip->i_flag |= IN_CHANGE | IN_UPDATE;
1308 } else
1309 error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0,
1310 UIO_SYSSPACE, IO_NODELOCKED, ap->a_cnp->cn_cred, NULL,
1311 curproc);
1312 vput(vp);
1313 return (error);
1314 }
1315
1316 /*
1317 * Vnode op for reading directories.
1318 *
1319 * This routine converts the on-disk struct direct entries to the
1320 * struct dirent entries expected by userland and the rest of the kernel.
1321 */
1322 int
ufs_readdir(void * v)1323 ufs_readdir(void *v)
1324 {
1325 struct vop_readdir_args *ap = v;
1326 struct uio auio, *uio = ap->a_uio;
1327 struct iovec aiov;
1328 union {
1329 struct dirent dn;
1330 char __pad[roundup(sizeof(struct dirent), 8)];
1331 } u;
1332 off_t off = uio->uio_offset;
1333 struct direct *dp;
1334 char *edp;
1335 caddr_t diskbuf;
1336 size_t count, entries;
1337 int bufsize, readcnt, error;
1338
1339 if (uio->uio_rw != UIO_READ)
1340 return (EINVAL);
1341
1342 count = uio->uio_resid;
1343 entries = (uio->uio_offset + count) & (DIRBLKSIZ - 1);
1344
1345 /* Make sure we don't return partial entries. */
1346 if (count <= entries)
1347 return (EINVAL);
1348
1349 /*
1350 * Convert and copy back the on-disk struct direct format to
1351 * the user-space struct dirent format, one entry at a time
1352 */
1353
1354 /* read from disk, stopping on a block boundary, max 64kB */
1355 readcnt = min(count, 64*1024) - entries;
1356
1357 auio = *uio;
1358 auio.uio_iov = &aiov;
1359 auio.uio_iovcnt = 1;
1360 auio.uio_resid = readcnt;
1361 auio.uio_segflg = UIO_SYSSPACE;
1362 aiov.iov_len = readcnt;
1363 bufsize = readcnt;
1364 diskbuf = malloc(bufsize, M_TEMP, M_WAITOK);
1365 aiov.iov_base = diskbuf;
1366 error = VOP_READ(ap->a_vp, &auio, 0, ap->a_cred);
1367 readcnt -= auio.uio_resid;
1368 dp = (struct direct *)diskbuf;
1369 edp = &diskbuf[readcnt];
1370
1371 memset(&u, 0, sizeof(u));
1372
1373 /*
1374 * While
1375 * - we haven't failed to VOP_READ or uiomove()
1376 * - there's space in the read buf for the head of an entry
1377 * - that entry has a valid d_reclen, and
1378 * - there's space for the *entire* entry
1379 * then we're good to process this one.
1380 */
1381 while (error == 0 &&
1382 (char *)dp + offsetof(struct direct, d_name) < edp &&
1383 dp->d_reclen > offsetof(struct direct, d_name) &&
1384 (char *)dp + dp->d_reclen <= edp) {
1385 u.dn.d_reclen = roundup(dp->d_namlen+1 +
1386 offsetof(struct dirent, d_name), 8);
1387 if (u.dn.d_reclen > uio->uio_resid)
1388 break;
1389 off += dp->d_reclen;
1390 u.dn.d_off = off;
1391 u.dn.d_fileno = dp->d_ino;
1392 u.dn.d_type = dp->d_type;
1393 u.dn.d_namlen = dp->d_namlen;
1394 memcpy(u.dn.d_name, dp->d_name, u.dn.d_namlen);
1395 memset(u.dn.d_name + u.dn.d_namlen, 0, u.dn.d_reclen
1396 - u.dn.d_namlen - offsetof(struct dirent, d_name));
1397
1398 error = uiomove(&u.dn, u.dn.d_reclen, uio);
1399 dp = (struct direct *)((char *)dp + dp->d_reclen);
1400 }
1401
1402 /*
1403 * If there was room for an entry in what we read but its
1404 * d_reclen is bogus, fail
1405 */
1406 if ((char *)dp + offsetof(struct direct, d_name) < edp &&
1407 dp->d_reclen <= offsetof(struct direct, d_name))
1408 error = EIO;
1409 free(diskbuf, M_TEMP, bufsize);
1410
1411 uio->uio_offset = off;
1412 *ap->a_eofflag = DIP(VTOI(ap->a_vp), size) <= off;
1413
1414 return (error);
1415 }
1416
1417 /*
1418 * Return target name of a symbolic link
1419 */
1420 int
ufs_readlink(void * v)1421 ufs_readlink(void *v)
1422 {
1423 struct vop_readlink_args *ap = v;
1424 struct vnode *vp = ap->a_vp;
1425 struct inode *ip = VTOI(vp);
1426 u_int64_t isize;
1427
1428 isize = DIP(ip, size);
1429 if (isize < ip->i_ump->um_maxsymlinklen)
1430 return (uiomove((char *)SHORTLINK(ip), isize, ap->a_uio));
1431 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred));
1432 }
1433
1434 /*
1435 * Lock an inode. If its already locked, set the WANT bit and sleep.
1436 */
1437 int
ufs_lock(void * v)1438 ufs_lock(void *v)
1439 {
1440 struct vop_lock_args *ap = v;
1441 struct vnode *vp = ap->a_vp;
1442
1443 return rrw_enter(&VTOI(vp)->i_lock, ap->a_flags & LK_RWFLAGS);
1444 }
1445
1446 /*
1447 * Unlock an inode. If WANT bit is on, wakeup.
1448 */
1449 int
ufs_unlock(void * v)1450 ufs_unlock(void *v)
1451 {
1452 struct vop_unlock_args *ap = v;
1453 struct vnode *vp = ap->a_vp;
1454
1455 rrw_exit(&VTOI(vp)->i_lock);
1456 return 0;
1457 }
1458
1459 /*
1460 * Check for a locked inode.
1461 */
1462 int
ufs_islocked(void * v)1463 ufs_islocked(void *v)
1464 {
1465 struct vop_islocked_args *ap = v;
1466
1467 return rrw_status(&VTOI(ap->a_vp)->i_lock);
1468 }
1469
1470 /*
1471 * Calculate the logical to physical mapping if not done already,
1472 * then call the device strategy routine.
1473 */
1474 int
ufs_strategy(void * v)1475 ufs_strategy(void *v)
1476 {
1477 struct vop_strategy_args *ap = v;
1478 struct buf *bp = ap->a_bp;
1479 struct vnode *vp = bp->b_vp;
1480 struct inode *ip;
1481 int error;
1482 int s;
1483
1484 ip = VTOI(vp);
1485 if (vp->v_type == VBLK || vp->v_type == VCHR)
1486 panic("ufs_strategy: spec");
1487 if (bp->b_blkno == bp->b_lblkno) {
1488 error = VOP_BMAP(vp, bp->b_lblkno, NULL, &bp->b_blkno,
1489 NULL);
1490 if (error) {
1491 bp->b_error = error;
1492 bp->b_flags |= B_ERROR;
1493 s = splbio();
1494 biodone(bp);
1495 splx(s);
1496 return (error);
1497 }
1498 if (bp->b_blkno == -1)
1499 clrbuf(bp);
1500 }
1501 if (bp->b_blkno == -1) {
1502 s = splbio();
1503 biodone(bp);
1504 splx(s);
1505 return (0);
1506 }
1507 vp = ip->i_devvp;
1508 bp->b_dev = vp->v_rdev;
1509 VOP_STRATEGY(vp, bp);
1510 return (0);
1511 }
1512
1513 /*
1514 * Print out the contents of an inode.
1515 */
1516 int
ufs_print(void * v)1517 ufs_print(void *v)
1518 {
1519 #ifdef DIAGNOSTIC
1520 struct vop_print_args *ap = v;
1521
1522 struct vnode *vp = ap->a_vp;
1523 struct inode *ip = VTOI(vp);
1524
1525 printf("tag VT_UFS, ino %u, on dev %d, %d", ip->i_number,
1526 major(ip->i_dev), minor(ip->i_dev));
1527 printf(" flags 0x%x, effnlink %d, nlink %d\n",
1528 ip->i_flag, ip->i_effnlink, DIP(ip, nlink));
1529 printf("\tmode 0%o, owner %d, group %d, size %lld",
1530 DIP(ip, mode), DIP(ip, uid), DIP(ip, gid), DIP(ip, size));
1531
1532 #ifdef FIFO
1533 if (vp->v_type == VFIFO)
1534 fifo_printinfo(vp);
1535 #endif /* FIFO */
1536 printf("\n");
1537
1538 #endif /* DIAGNOSTIC */
1539
1540 return (0);
1541 }
1542
1543 /*
1544 * Read wrapper for special devices.
1545 */
1546 int
ufsspec_read(void * v)1547 ufsspec_read(void *v)
1548 {
1549 struct vop_read_args *ap = v;
1550
1551 /*
1552 * Set access flag.
1553 */
1554 VTOI(ap->a_vp)->i_flag |= IN_ACCESS;
1555 return (spec_read(ap));
1556 }
1557
1558 /*
1559 * Write wrapper for special devices.
1560 */
1561 int
ufsspec_write(void * v)1562 ufsspec_write(void *v)
1563 {
1564 struct vop_write_args *ap = v;
1565
1566 /*
1567 * Set update and change flags.
1568 */
1569 VTOI(ap->a_vp)->i_flag |= IN_CHANGE | IN_UPDATE;
1570 return (spec_write(ap));
1571 }
1572
1573 /*
1574 * Close wrapper for special devices.
1575 *
1576 * Update the times on the inode then do device close.
1577 */
1578 int
ufsspec_close(void * v)1579 ufsspec_close(void *v)
1580 {
1581 struct vop_close_args *ap = v;
1582 struct vnode *vp = ap->a_vp;
1583
1584 if (vp->v_usecount > 1)
1585 ufs_itimes(vp);
1586 return (spec_close(ap));
1587 }
1588
1589 #ifdef FIFO
1590 /*
1591 * Read wrapper for fifo's
1592 */
1593 int
ufsfifo_read(void * v)1594 ufsfifo_read(void *v)
1595 {
1596 struct vop_read_args *ap = v;
1597
1598 /*
1599 * Set access flag.
1600 */
1601 VTOI(ap->a_vp)->i_flag |= IN_ACCESS;
1602 return (fifo_read(ap));
1603 }
1604
1605 /*
1606 * Write wrapper for fifo's.
1607 */
1608 int
ufsfifo_write(void * v)1609 ufsfifo_write(void *v)
1610 {
1611 struct vop_write_args *ap = v;
1612
1613 /*
1614 * Set update and change flags.
1615 */
1616 VTOI(ap->a_vp)->i_flag |= IN_CHANGE | IN_UPDATE;
1617 return (fifo_write(ap));
1618 }
1619
1620 /*
1621 * Close wrapper for fifo's.
1622 *
1623 * Update the times on the inode then do device close.
1624 */
1625 int
ufsfifo_close(void * v)1626 ufsfifo_close(void *v)
1627 {
1628 struct vop_close_args *ap = v;
1629 struct vnode *vp = ap->a_vp;
1630
1631 if (vp->v_usecount > 1)
1632 ufs_itimes(vp);
1633 return (fifo_close(ap));
1634 }
1635 #endif /* FIFO */
1636
1637 /*
1638 * Return POSIX pathconf information applicable to ufs filesystems.
1639 */
1640 int
ufs_pathconf(void * v)1641 ufs_pathconf(void *v)
1642 {
1643 struct vop_pathconf_args *ap = v;
1644 int error = 0;
1645
1646 switch (ap->a_name) {
1647 case _PC_LINK_MAX:
1648 *ap->a_retval = LINK_MAX;
1649 break;
1650 case _PC_NAME_MAX:
1651 *ap->a_retval = NAME_MAX;
1652 break;
1653 case _PC_CHOWN_RESTRICTED:
1654 *ap->a_retval = 1;
1655 break;
1656 case _PC_NO_TRUNC:
1657 *ap->a_retval = 1;
1658 break;
1659 case _PC_ALLOC_SIZE_MIN:
1660 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_bsize;
1661 break;
1662 case _PC_FILESIZEBITS:
1663 *ap->a_retval = 64;
1664 break;
1665 case _PC_REC_INCR_XFER_SIZE:
1666 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
1667 break;
1668 case _PC_REC_MAX_XFER_SIZE:
1669 *ap->a_retval = -1; /* means ``unlimited'' */
1670 break;
1671 case _PC_REC_MIN_XFER_SIZE:
1672 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
1673 break;
1674 case _PC_REC_XFER_ALIGN:
1675 *ap->a_retval = PAGE_SIZE;
1676 break;
1677 case _PC_SYMLINK_MAX:
1678 *ap->a_retval = MAXPATHLEN;
1679 break;
1680 case _PC_2_SYMLINKS:
1681 *ap->a_retval = 1;
1682 break;
1683 case _PC_TIMESTAMP_RESOLUTION:
1684 *ap->a_retval = 1;
1685 break;
1686 default:
1687 error = EINVAL;
1688 break;
1689 }
1690
1691 return (error);
1692 }
1693
1694 /*
1695 * Advisory record locking support
1696 */
1697 int
ufs_advlock(void * v)1698 ufs_advlock(void *v)
1699 {
1700 struct vop_advlock_args *ap = v;
1701 struct inode *ip = VTOI(ap->a_vp);
1702
1703 return (lf_advlock(&ip->i_lockf, DIP(ip, size), ap->a_id, ap->a_op,
1704 ap->a_fl, ap->a_flags));
1705 }
1706
1707 /*
1708 * Allocate a new inode.
1709 */
1710 int
ufs_makeinode(int mode,struct vnode * dvp,struct vnode ** vpp,struct componentname * cnp)1711 ufs_makeinode(int mode, struct vnode *dvp, struct vnode **vpp,
1712 struct componentname *cnp)
1713 {
1714 struct inode *ip, *pdir;
1715 struct direct newdir;
1716 struct vnode *tvp;
1717 int error;
1718
1719 pdir = VTOI(dvp);
1720 #ifdef DIAGNOSTIC
1721 if ((cnp->cn_flags & HASBUF) == 0)
1722 panic("ufs_makeinode: no name");
1723 #endif
1724 *vpp = NULL;
1725 if ((mode & IFMT) == 0)
1726 mode |= IFREG;
1727
1728 if ((error = UFS_INODE_ALLOC(pdir, mode, cnp->cn_cred, &tvp)) != 0) {
1729 pool_put(&namei_pool, cnp->cn_pnbuf);
1730 return (error);
1731 }
1732
1733 ip = VTOI(tvp);
1734
1735 DIP_ASSIGN(ip, gid, DIP(pdir, gid));
1736 DIP_ASSIGN(ip, uid, cnp->cn_cred->cr_uid);
1737
1738 if ((error = getinoquota(ip)) ||
1739 (error = ufs_quota_alloc_inode(ip, cnp->cn_cred))) {
1740 pool_put(&namei_pool, cnp->cn_pnbuf);
1741 UFS_INODE_FREE(ip, ip->i_number, mode);
1742 vput(tvp);
1743 return (error);
1744 }
1745
1746 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
1747 DIP_ASSIGN(ip, mode, mode);
1748 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */
1749 ip->i_effnlink = 1;
1750 DIP_ASSIGN(ip, nlink, 1);
1751 if ((DIP(ip, mode) & ISGID) &&
1752 !groupmember(DIP(ip, gid), cnp->cn_cred) &&
1753 !vnoperm(dvp) &&
1754 suser_ucred(cnp->cn_cred))
1755 DIP_AND(ip, mode, ~ISGID);
1756
1757 /*
1758 * Make sure inode goes to disk before directory entry.
1759 */
1760 if ((error = UFS_UPDATE(ip, 1)) != 0)
1761 goto bad;
1762
1763 ufs_makedirentry(ip, cnp, &newdir);
1764 if ((error = ufs_direnter(dvp, tvp, &newdir, cnp, NULL)) != 0)
1765 goto bad;
1766
1767 if ((cnp->cn_flags & SAVESTART) == 0)
1768 pool_put(&namei_pool, cnp->cn_pnbuf);
1769 *vpp = tvp;
1770 return (0);
1771
1772 bad:
1773 /*
1774 * Write error occurred trying to update the inode
1775 * or the directory so must deallocate the inode.
1776 */
1777 pool_put(&namei_pool, cnp->cn_pnbuf);
1778 ip->i_effnlink = 0;
1779 DIP_ASSIGN(ip, nlink, 0);
1780 ip->i_flag |= IN_CHANGE;
1781 tvp->v_type = VNON;
1782 vput(tvp);
1783
1784 return (error);
1785 }
1786
1787 const struct filterops ufsread_filtops = {
1788 .f_flags = FILTEROP_ISFD,
1789 .f_attach = NULL,
1790 .f_detach = filt_ufsdetach,
1791 .f_event = filt_ufsread,
1792 };
1793
1794 const struct filterops ufswrite_filtops = {
1795 .f_flags = FILTEROP_ISFD,
1796 .f_attach = NULL,
1797 .f_detach = filt_ufsdetach,
1798 .f_event = filt_ufswrite,
1799 };
1800
1801 const struct filterops ufsvnode_filtops = {
1802 .f_flags = FILTEROP_ISFD,
1803 .f_attach = NULL,
1804 .f_detach = filt_ufsdetach,
1805 .f_event = filt_ufsvnode,
1806 };
1807
1808 int
ufs_kqfilter(void * v)1809 ufs_kqfilter(void *v)
1810 {
1811 struct vop_kqfilter_args *ap = v;
1812 struct vnode *vp = ap->a_vp;
1813 struct knote *kn = ap->a_kn;
1814
1815 switch (kn->kn_filter) {
1816 case EVFILT_READ:
1817 kn->kn_fop = &ufsread_filtops;
1818 break;
1819 case EVFILT_WRITE:
1820 kn->kn_fop = &ufswrite_filtops;
1821 break;
1822 case EVFILT_VNODE:
1823 kn->kn_fop = &ufsvnode_filtops;
1824 break;
1825 default:
1826 return (EINVAL);
1827 }
1828
1829 kn->kn_hook = (caddr_t)vp;
1830
1831 klist_insert_locked(&vp->v_klist, kn);
1832
1833 return (0);
1834 }
1835
1836 void
filt_ufsdetach(struct knote * kn)1837 filt_ufsdetach(struct knote *kn)
1838 {
1839 struct vnode *vp = (struct vnode *)kn->kn_hook;
1840
1841 klist_remove_locked(&vp->v_klist, kn);
1842 }
1843
1844 int
filt_ufsread(struct knote * kn,long hint)1845 filt_ufsread(struct knote *kn, long hint)
1846 {
1847 struct vnode *vp = (struct vnode *)kn->kn_hook;
1848 struct inode *ip = VTOI(vp);
1849
1850 /*
1851 * filesystem is gone, so set the EOF flag and schedule
1852 * the knote for deletion.
1853 */
1854 if (hint == NOTE_REVOKE) {
1855 kn->kn_flags |= (EV_EOF | EV_ONESHOT);
1856 return (1);
1857 }
1858
1859 #ifdef EXT2FS
1860 if (IS_EXT2_VNODE(ip->i_vnode))
1861 kn->kn_data = ext2fs_size(ip) - foffset(kn->kn_fp);
1862 else
1863 #endif
1864 kn->kn_data = DIP(ip, size) - foffset(kn->kn_fp);
1865 if (kn->kn_data == 0 && kn->kn_sfflags & NOTE_EOF) {
1866 kn->kn_fflags |= NOTE_EOF;
1867 return (1);
1868 }
1869
1870 if (kn->kn_flags & (__EV_POLL | __EV_SELECT))
1871 return (1);
1872
1873 return (kn->kn_data != 0);
1874 }
1875
1876 int
filt_ufswrite(struct knote * kn,long hint)1877 filt_ufswrite(struct knote *kn, long hint)
1878 {
1879 /*
1880 * filesystem is gone, so set the EOF flag and schedule
1881 * the knote for deletion.
1882 */
1883 if (hint == NOTE_REVOKE) {
1884 kn->kn_flags |= (EV_EOF | EV_ONESHOT);
1885 return (1);
1886 }
1887
1888 kn->kn_data = 0;
1889 return (1);
1890 }
1891
1892 int
filt_ufsvnode(struct knote * kn,long hint)1893 filt_ufsvnode(struct knote *kn, long hint)
1894 {
1895 if (kn->kn_sfflags & hint)
1896 kn->kn_fflags |= hint;
1897 if (hint == NOTE_REVOKE) {
1898 kn->kn_flags |= EV_EOF;
1899 return (1);
1900 }
1901 return (kn->kn_fflags != 0);
1902 }
1903