1 /* $OpenBSD: ufs_vnops.c,v 1.67 2005/07/24 05:43:36 millert 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/file.h>
46 #include <sys/stat.h>
47 #include <sys/buf.h>
48 #include <sys/proc.h>
49 #include <sys/conf.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/poll.h>
58
59 #include <uvm/uvm_extern.h>
60
61 #include <miscfs/specfs/specdev.h>
62 #include <miscfs/fifofs/fifo.h>
63
64 #include <ufs/ufs/quota.h>
65 #include <ufs/ufs/inode.h>
66 #include <ufs/ufs/dir.h>
67 #include <ufs/ufs/ufsmount.h>
68 #include <ufs/ufs/ufs_extern.h>
69 #ifdef UFS_DIRHASH
70 #include <ufs/ufs/dirhash.h>
71 #endif
72 #include <ufs/ext2fs/ext2fs_extern.h>
73
74 static int ufs_chmod(struct vnode *, int, struct ucred *, struct proc *);
75 static int ufs_chown(struct vnode *, uid_t, gid_t, struct ucred *, struct proc *);
76 int filt_ufsread(struct knote *kn, long hint);
77 int filt_ufswrite(struct knote *kn, long hint);
78 int filt_ufsvnode(struct knote *kn, long hint);
79 void filt_ufsdetach(struct knote *kn);
80
81 union _qcvt {
82 int64_t qcvt;
83 int32_t val[2];
84 };
85 #define SETHIGH(q, h) { \
86 union _qcvt tmp; \
87 tmp.qcvt = (q); \
88 tmp.val[_QUAD_HIGHWORD] = (h); \
89 (q) = tmp.qcvt; \
90 }
91 #define SETLOW(q, l) { \
92 union _qcvt tmp; \
93 tmp.qcvt = (q); \
94 tmp.val[_QUAD_LOWWORD] = (l); \
95 (q) = tmp.qcvt; \
96 }
97 #define VN_KNOTE(vp, b) \
98 KNOTE(&vp->v_selectinfo.vsi_selinfo.si_note, (b))
99
100
101 /*
102 * A virgin directory (no blushing please).
103 */
104 static struct dirtemplate mastertemplate = {
105 0, 12, DT_DIR, 1, ".",
106 0, DIRBLKSIZ - 12, DT_DIR, 2, ".."
107 };
108 static struct odirtemplate omastertemplate = {
109 0, 12, 1, ".",
110 0, DIRBLKSIZ - 12, 2, ".."
111 };
112
113 /*
114 * Create a regular file
115 */
116 int
ufs_create(v)117 ufs_create(v)
118 void *v;
119 {
120 struct vop_create_args /* {
121 struct vnode *a_dvp;
122 struct vnode **a_vpp;
123 struct componentname *a_cnp;
124 struct vattr *a_vap;
125 } */ *ap = v;
126 int error;
127
128 error =
129 ufs_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode),
130 ap->a_dvp, ap->a_vpp, ap->a_cnp);
131 if (error)
132 return (error);
133 VN_KNOTE(ap->a_dvp, NOTE_WRITE);
134 return (0);
135 }
136
137 /*
138 * Mknod vnode call
139 */
140 /* ARGSUSED */
141 int
ufs_mknod(v)142 ufs_mknod(v)
143 void *v;
144 {
145 struct vop_mknod_args /* {
146 struct vnode *a_dvp;
147 struct vnode **a_vpp;
148 struct componentname *a_cnp;
149 struct vattr *a_vap;
150 } */ *ap = v;
151 struct vattr *vap = ap->a_vap;
152 struct vnode **vpp = ap->a_vpp;
153 struct inode *ip;
154 int error;
155
156 if ((error =
157 ufs_makeinode(MAKEIMODE(vap->va_type, vap->va_mode),
158 ap->a_dvp, vpp, ap->a_cnp)) != 0)
159 return (error);
160 VN_KNOTE(ap->a_dvp, NOTE_WRITE);
161 ip = VTOI(*vpp);
162 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
163 if (vap->va_rdev != VNOVAL) {
164 /*
165 * Want to be able to use this to make badblock
166 * inodes, so don't truncate the dev number.
167 */
168 ip->i_ffs_rdev = vap->va_rdev;
169 }
170 /*
171 * Remove inode so that it will be reloaded by VFS_VGET and
172 * checked to see if it is an alias of an existing entry in
173 * the inode cache.
174 */
175 vput(*vpp);
176 (*vpp)->v_type = VNON;
177 vgone(*vpp);
178 *vpp = 0;
179 return (0);
180 }
181
182 /*
183 * Open called.
184 *
185 * Nothing to do.
186 */
187 /* ARGSUSED */
188 int
ufs_open(v)189 ufs_open(v)
190 void *v;
191 {
192 struct vop_open_args /* {
193 struct vnode *a_vp;
194 int a_mode;
195 struct ucred *a_cred;
196 struct proc *a_p;
197 } */ *ap = v;
198 struct inode *ip = VTOI(ap->a_vp);
199
200 /*
201 * Files marked append-only must be opened for appending.
202 */
203 if ((ip->i_ffs_flags & APPEND) &&
204 (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE)
205 return (EPERM);
206
207 if (ap->a_mode & O_TRUNC)
208 ip->i_flag |= IN_CHANGE | IN_UPDATE;
209
210 return (0);
211 }
212
213 /*
214 * Close called.
215 *
216 * Update the times on the inode.
217 */
218 /* ARGSUSED */
219 int
ufs_close(v)220 ufs_close(v)
221 void *v;
222 {
223 struct vop_close_args /* {
224 struct vnode *a_vp;
225 int a_fflag;
226 struct ucred *a_cred;
227 struct proc *a_p;
228 } */ *ap = v;
229 struct vnode *vp = ap->a_vp;
230 struct inode *ip = VTOI(vp);
231
232 simple_lock(&vp->v_interlock);
233 if (vp->v_usecount > 1)
234 ITIMES(ip, &time, &time);
235 simple_unlock(&vp->v_interlock);
236 return (0);
237 }
238
239 int
ufs_access(v)240 ufs_access(v)
241 void *v;
242 {
243 struct vop_access_args /* {
244 struct vnode *a_vp;
245 int a_mode;
246 struct ucred *a_cred;
247 struct proc *a_p;
248 } */ *ap = v;
249 struct vnode *vp = ap->a_vp;
250 struct inode *ip = VTOI(vp);
251 mode_t mode = ap->a_mode;
252
253 /*
254 * Disallow write attempts on read-only file systems;
255 * unless the file is a socket, fifo, or a block or
256 * character device resident on the file system.
257 */
258 if (mode & VWRITE) {
259 switch (vp->v_type) {
260 int error;
261 case VDIR:
262 case VLNK:
263 case VREG:
264 if (vp->v_mount->mnt_flag & MNT_RDONLY)
265 return (EROFS);
266
267 if ((error = getinoquota(ip)) != 0)
268 return (error);
269 break;
270 case VBAD:
271 case VBLK:
272 case VCHR:
273 case VSOCK:
274 case VFIFO:
275 case VNON:
276 break;
277
278 }
279 }
280
281 /* If immutable bit set, nobody gets to write it. */
282 if ((mode & VWRITE) && (ip->i_ffs_flags & IMMUTABLE))
283 return (EPERM);
284
285 return (vaccess(ip->i_ffs_mode, ip->i_ffs_uid, ip->i_ffs_gid,
286 mode, ap->a_cred));
287 }
288
289 /* ARGSUSED */
290 int
ufs_getattr(v)291 ufs_getattr(v)
292 void *v;
293 {
294 struct vop_getattr_args /* {
295 struct vnode *a_vp;
296 struct vattr *a_vap;
297 struct ucred *a_cred;
298 struct proc *a_p;
299 } */ *ap = v;
300 struct vnode *vp = ap->a_vp;
301 struct inode *ip = VTOI(vp);
302 struct vattr *vap = ap->a_vap;
303
304 ITIMES(ip, &time, &time);
305 /*
306 * Copy from inode table
307 */
308 vap->va_fsid = ip->i_dev;
309 vap->va_fileid = ip->i_number;
310 vap->va_mode = ip->i_ffs_mode & ~IFMT;
311 vap->va_nlink = ip->i_effnlink;
312 vap->va_uid = ip->i_ffs_uid;
313 vap->va_gid = ip->i_ffs_gid;
314 vap->va_rdev = (dev_t)ip->i_ffs_rdev;
315 vap->va_size = ip->i_ffs_size;
316 vap->va_atime.tv_sec = ip->i_ffs_atime;
317 vap->va_atime.tv_nsec = ip->i_ffs_atimensec;
318 vap->va_mtime.tv_sec = ip->i_ffs_mtime;
319 vap->va_mtime.tv_nsec = ip->i_ffs_mtimensec;
320 vap->va_ctime.tv_sec = ip->i_ffs_ctime;
321 vap->va_ctime.tv_nsec = ip->i_ffs_ctimensec;
322 vap->va_flags = ip->i_ffs_flags;
323 vap->va_gen = ip->i_ffs_gen;
324 /* this doesn't belong here */
325 if (vp->v_type == VBLK)
326 vap->va_blocksize = BLKDEV_IOSIZE;
327 else if (vp->v_type == VCHR)
328 vap->va_blocksize = MAXBSIZE;
329 else
330 vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize;
331 vap->va_bytes = dbtob((u_quad_t)ip->i_ffs_blocks);
332 vap->va_type = vp->v_type;
333 vap->va_filerev = ip->i_modrev;
334 return (0);
335 }
336
337 /*
338 * Set attribute vnode op. called from several syscalls
339 */
340 int
ufs_setattr(v)341 ufs_setattr(v)
342 void *v;
343 {
344 struct vop_setattr_args /* {
345 struct vnode *a_vp;
346 struct vattr *a_vap;
347 struct ucred *a_cred;
348 struct proc *a_p;
349 } */ *ap = v;
350 struct vattr *vap = ap->a_vap;
351 struct vnode *vp = ap->a_vp;
352 struct inode *ip = VTOI(vp);
353 struct ucred *cred = ap->a_cred;
354 struct proc *p = ap->a_p;
355 int error;
356 long hint = NOTE_ATTRIB;
357 u_quad_t oldsize;
358
359 /*
360 * Check for unsettable attributes.
361 */
362 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
363 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
364 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
365 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
366 return (EINVAL);
367 }
368 if (vap->va_flags != VNOVAL) {
369 if (vp->v_mount->mnt_flag & MNT_RDONLY)
370 return (EROFS);
371 if (cred->cr_uid != ip->i_ffs_uid &&
372 (error = suser_ucred(cred)))
373 return (error);
374 if (cred->cr_uid == 0) {
375 if ((ip->i_ffs_flags & (SF_IMMUTABLE | SF_APPEND)) &&
376 securelevel > 0)
377 return (EPERM);
378 ip->i_ffs_flags = vap->va_flags;
379 } else {
380 if (ip->i_ffs_flags & (SF_IMMUTABLE | SF_APPEND) ||
381 (vap->va_flags & UF_SETTABLE) != vap->va_flags)
382 return (EPERM);
383 ip->i_ffs_flags &= SF_SETTABLE;
384 ip->i_ffs_flags |= (vap->va_flags & UF_SETTABLE);
385 }
386 ip->i_flag |= IN_CHANGE;
387 if (vap->va_flags & (IMMUTABLE | APPEND))
388 return (0);
389 }
390 if (ip->i_ffs_flags & (IMMUTABLE | APPEND))
391 return (EPERM);
392 /*
393 * Go through the fields and update if not VNOVAL.
394 */
395 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
396 if (vp->v_mount->mnt_flag & MNT_RDONLY)
397 return (EROFS);
398 error = ufs_chown(vp, vap->va_uid, vap->va_gid, cred, p);
399 if (error)
400 return (error);
401 }
402 if (vap->va_size != VNOVAL) {
403 oldsize = ip->i_ffs_size;
404 /*
405 * Disallow write attempts on read-only file systems;
406 * unless the file is a socket, fifo, or a block or
407 * character device resident on the file system.
408 */
409 switch (vp->v_type) {
410 case VDIR:
411 return (EISDIR);
412 case VLNK:
413 case VREG:
414 if (vp->v_mount->mnt_flag & MNT_RDONLY)
415 return (EROFS);
416 break;
417 default:
418 break;
419 }
420 if ((error = UFS_TRUNCATE(ip, vap->va_size, 0, cred)) != 0)
421 return (error);
422 if (vap->va_size < oldsize)
423 hint |= NOTE_TRUNCATE;
424 }
425 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
426 if (vp->v_mount->mnt_flag & MNT_RDONLY)
427 return (EROFS);
428 if (cred->cr_uid != ip->i_ffs_uid &&
429 (error = suser_ucred(cred)) &&
430 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
431 (error = VOP_ACCESS(vp, VWRITE, cred, p))))
432 return (error);
433 if (vap->va_atime.tv_sec != VNOVAL)
434 ip->i_flag |= IN_ACCESS;
435 if (vap->va_mtime.tv_sec != VNOVAL)
436 ip->i_flag |= IN_CHANGE | IN_UPDATE;
437 error = UFS_UPDATE2(ip, &vap->va_atime, &vap->va_mtime, 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, p);
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 static int
ufs_chmod(vp,mode,cred,p)456 ufs_chmod(vp, mode, cred, p)
457 struct vnode *vp;
458 int mode;
459 struct ucred *cred;
460 struct proc *p;
461 {
462 struct inode *ip = VTOI(vp);
463 int error;
464
465 if (cred->cr_uid != ip->i_ffs_uid &&
466 (error = suser_ucred(cred)))
467 return (error);
468 if (cred->cr_uid) {
469 if (vp->v_type != VDIR && (mode & S_ISTXT))
470 return (EFTYPE);
471 if (!groupmember(ip->i_ffs_gid, cred) && (mode & ISGID))
472 return (EPERM);
473 }
474 ip->i_ffs_mode &= ~ALLPERMS;
475 ip->i_ffs_mode |= (mode & ALLPERMS);
476 ip->i_flag |= IN_CHANGE;
477 if ((vp->v_flag & VTEXT) && (ip->i_ffs_mode & S_ISTXT) == 0)
478 (void) uvm_vnp_uncache(vp);
479 return (0);
480 }
481
482 /*
483 * Perform chown operation on inode ip;
484 * inode must be locked prior to call.
485 */
486 static int
ufs_chown(vp,uid,gid,cred,p)487 ufs_chown(vp, uid, gid, cred, p)
488 struct vnode *vp;
489 uid_t uid;
490 gid_t gid;
491 struct ucred *cred;
492 struct proc *p;
493 {
494 struct inode *ip = VTOI(vp);
495 uid_t ouid;
496 gid_t ogid;
497 int error = 0;
498 daddr_t change;
499 enum ufs_quota_flags quota_flags = 0;
500
501 if (uid == (uid_t)VNOVAL)
502 uid = ip->i_ffs_uid;
503 if (gid == (gid_t)VNOVAL)
504 gid = ip->i_ffs_gid;
505 /*
506 * If we don't own the file, are trying to change the owner
507 * of the file, or are not a member of the target group,
508 * the caller must be superuser or the call fails.
509 */
510 if ((cred->cr_uid != ip->i_ffs_uid || uid != ip->i_ffs_uid ||
511 (gid != ip->i_ffs_gid && !groupmember((gid_t)gid, cred))) &&
512 (error = suser_ucred(cred)))
513 return (error);
514 ogid = ip->i_ffs_gid;
515 ouid = ip->i_ffs_uid;
516 change = ip->i_ffs_blocks;
517
518 if (ouid == uid)
519 quota_flags |= UFS_QUOTA_NOUID;
520
521 if (ogid == gid)
522 quota_flags |= UFS_QUOTA_NOGID;
523
524 if ((error = getinoquota(ip)) != 0)
525 return (error);
526 (void) ufs_quota_free_blocks2(ip, change, cred, quota_flags);
527 (void) ufs_quota_free_inode2(ip, cred, quota_flags);
528 (void) ufs_quota_delete(ip);
529
530 ip->i_ffs_gid = gid;
531 ip->i_ffs_uid = uid;
532
533 if ((error = getinoquota(ip)) != 0)
534 goto error;
535
536 if ((error = ufs_quota_alloc_blocks2(ip, change, cred,
537 quota_flags)) != 0)
538 goto error;
539
540 if ((error = ufs_quota_alloc_inode2(ip, cred ,
541 quota_flags)) != 0) {
542 (void)ufs_quota_free_blocks2(ip, change, cred,
543 quota_flags);
544 goto error;
545 }
546
547 if (getinoquota(ip))
548 panic("chown: lost quota");
549
550 if (ouid != uid || ogid != gid)
551 ip->i_flag |= IN_CHANGE;
552 if (ouid != uid && cred->cr_uid != 0)
553 ip->i_ffs_mode &= ~ISUID;
554 if (ogid != gid && cred->cr_uid != 0)
555 ip->i_ffs_mode &= ~ISGID;
556 return (0);
557
558 error:
559 (void) ufs_quota_delete(ip);
560
561 ip->i_ffs_gid = ogid;
562 ip->i_ffs_uid = ouid;
563 if (getinoquota(ip) == 0) {
564 (void) ufs_quota_alloc_blocks2(ip, change, cred,
565 quota_flags | UFS_QUOTA_FORCE);
566 (void) ufs_quota_alloc_inode2(ip, cred,
567 quota_flags | UFS_QUOTA_FORCE);
568 (void) getinoquota(ip);
569 }
570 return (error);
571
572 }
573
574 /* ARGSUSED */
575 int
ufs_ioctl(v)576 ufs_ioctl(v)
577 void *v;
578 {
579 #if 0
580 struct vop_ioctl_args /* {
581 struct vnode *a_vp;
582 u_long a_command;
583 caddr_t a_data;
584 int a_fflag;
585 struct ucred *a_cred;
586 struct proc *a_p;
587 } */ *ap = v;
588 #endif
589 return (ENOTTY);
590 }
591
592 /* ARGSUSED */
593 int
ufs_poll(v)594 ufs_poll(v)
595 void *v;
596 {
597 struct vop_poll_args /* {
598 struct vnode *a_vp;
599 int a_events;
600 struct proc *a_p;
601 } */ *ap = v;
602
603 /*
604 * We should really check to see if I/O is possible.
605 */
606 return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
607 }
608
609 /*
610 * Seek on a file
611 *
612 * Nothing to do, so just return.
613 */
614 /* ARGSUSED */
615 int
ufs_seek(v)616 ufs_seek(v)
617 void *v;
618 {
619 #if 0
620 struct vop_seek_args /* {
621 struct vnode *a_vp;
622 off_t a_oldoff;
623 off_t a_newoff;
624 struct ucred *a_cred;
625 } */ *ap = v;
626 #endif
627
628 return (0);
629 }
630
631 int
ufs_remove(v)632 ufs_remove(v)
633 void *v;
634 {
635 struct vop_remove_args /* {
636 struct vnode *a_dvp;
637 struct vnode *a_vp;
638 struct componentname *a_cnp;
639 } */ *ap = v;
640 struct inode *ip;
641 struct vnode *vp = ap->a_vp;
642 struct vnode *dvp = ap->a_dvp;
643 int error;
644
645 ip = VTOI(vp);
646 if (vp->v_type == VDIR || (ip->i_ffs_flags & (IMMUTABLE | APPEND)) ||
647 (VTOI(dvp)->i_ffs_flags & APPEND)) {
648 error = EPERM;
649 goto out;
650 }
651 error = ufs_dirremove(dvp, ip, ap->a_cnp->cn_flags, 0);
652 VN_KNOTE(vp, NOTE_DELETE);
653 VN_KNOTE(dvp, NOTE_WRITE);
654 out:
655 if (dvp == vp)
656 vrele(vp);
657 else
658 vput(vp);
659 vput(dvp);
660 return (error);
661 }
662
663 /*
664 * link vnode call
665 */
666 int
ufs_link(v)667 ufs_link(v)
668 void *v;
669 {
670 struct vop_link_args /* {
671 struct vnode *a_dvp;
672 struct vnode *a_vp;
673 struct componentname *a_cnp;
674 } */ *ap = v;
675 struct vnode *dvp = ap->a_dvp;
676 struct vnode *vp = ap->a_vp;
677 struct componentname *cnp = ap->a_cnp;
678 struct proc *p = cnp->cn_proc;
679 struct inode *ip;
680 struct direct newdir;
681 int error;
682
683 #ifdef DIAGNOSTIC
684 if ((cnp->cn_flags & HASBUF) == 0)
685 panic("ufs_link: no name");
686 #endif
687 if (vp->v_type == VDIR) {
688 VOP_ABORTOP(dvp, cnp);
689 error = EPERM;
690 goto out2;
691 }
692 if (dvp->v_mount != vp->v_mount) {
693 VOP_ABORTOP(dvp, cnp);
694 error = EXDEV;
695 goto out2;
696 }
697 if (dvp != vp && (error = vn_lock(vp, LK_EXCLUSIVE, p))) {
698 VOP_ABORTOP(dvp, cnp);
699 goto out2;
700 }
701 ip = VTOI(vp);
702 if ((nlink_t)ip->i_ffs_nlink >= LINK_MAX) {
703 VOP_ABORTOP(dvp, cnp);
704 error = EMLINK;
705 goto out1;
706 }
707 if (ip->i_ffs_flags & (IMMUTABLE | APPEND)) {
708 VOP_ABORTOP(dvp, cnp);
709 error = EPERM;
710 goto out1;
711 }
712 ip->i_effnlink++;
713 ip->i_ffs_nlink++;
714 ip->i_flag |= IN_CHANGE;
715 if (DOINGSOFTDEP(vp))
716 softdep_change_linkcnt(ip, 0);
717 if ((error = UFS_UPDATE(ip, !DOINGSOFTDEP(vp))) == 0) {
718 ufs_makedirentry(ip, cnp, &newdir);
719 error = ufs_direnter(dvp, vp, &newdir, cnp, NULL);
720 }
721 if (error) {
722 ip->i_effnlink--;
723 ip->i_ffs_nlink--;
724 ip->i_flag |= IN_CHANGE;
725 if (DOINGSOFTDEP(vp))
726 softdep_change_linkcnt(ip, 0);
727 }
728 pool_put(&namei_pool, cnp->cn_pnbuf);
729 VN_KNOTE(vp, NOTE_LINK);
730 VN_KNOTE(dvp, NOTE_WRITE);
731 out1:
732 if (dvp != vp)
733 VOP_UNLOCK(vp, 0, p);
734 out2:
735 vput(dvp);
736 return (error);
737 }
738
739 /*
740 * Rename system call.
741 * rename("foo", "bar");
742 * is essentially
743 * unlink("bar");
744 * link("foo", "bar");
745 * unlink("foo");
746 * but ``atomically''. Can't do full commit without saving state in the
747 * inode on disk which isn't feasible at this time. Best we can do is
748 * always guarantee the target exists.
749 *
750 * Basic algorithm is:
751 *
752 * 1) Bump link count on source while we're linking it to the
753 * target. This also ensure the inode won't be deleted out
754 * from underneath us while we work (it may be truncated by
755 * a concurrent `trunc' or `open' for creation).
756 * 2) Link source to destination. If destination already exists,
757 * delete it first.
758 * 3) Unlink source reference to inode if still around. If a
759 * directory was moved and the parent of the destination
760 * is different from the source, patch the ".." entry in the
761 * directory.
762 */
763 int
ufs_rename(v)764 ufs_rename(v)
765 void *v;
766 {
767 struct vop_rename_args /* {
768 struct vnode *a_fdvp;
769 struct vnode *a_fvp;
770 struct componentname *a_fcnp;
771 struct vnode *a_tdvp;
772 struct vnode *a_tvp;
773 struct componentname *a_tcnp;
774 } */ *ap = v;
775 struct vnode *tvp = ap->a_tvp;
776 struct vnode *tdvp = ap->a_tdvp;
777 struct vnode *fvp = ap->a_fvp;
778 struct vnode *fdvp = ap->a_fdvp;
779 struct componentname *tcnp = ap->a_tcnp;
780 struct componentname *fcnp = ap->a_fcnp;
781 struct proc *p = fcnp->cn_proc;
782 struct inode *ip, *xp, *dp;
783 struct direct newdir;
784 int doingdirectory = 0, oldparent = 0, newparent = 0;
785 int error = 0;
786
787 #ifdef DIAGNOSTIC
788 if ((tcnp->cn_flags & HASBUF) == 0 ||
789 (fcnp->cn_flags & HASBUF) == 0)
790 panic("ufs_rename: no name");
791 #endif
792 /*
793 * Check for cross-device rename.
794 */
795 if ((fvp->v_mount != tdvp->v_mount) ||
796 (tvp && (fvp->v_mount != tvp->v_mount))) {
797 error = EXDEV;
798 abortit:
799 VOP_ABORTOP(tdvp, tcnp); /* XXX, why not in NFS? */
800 if (tdvp == tvp)
801 vrele(tdvp);
802 else
803 vput(tdvp);
804 if (tvp)
805 vput(tvp);
806 VOP_ABORTOP(fdvp, fcnp); /* XXX, why not in NFS? */
807 vrele(fdvp);
808 vrele(fvp);
809 return (error);
810 }
811
812 if (tvp && ((VTOI(tvp)->i_ffs_flags & (IMMUTABLE | APPEND)) ||
813 (VTOI(tdvp)->i_ffs_flags & APPEND))) {
814 error = EPERM;
815 goto abortit;
816 }
817
818 /*
819 * Check if just deleting a link name or if we've lost a race.
820 * If another process completes the same rename after we've looked
821 * up the source and have blocked looking up the target, then the
822 * source and target inodes may be identical now although the
823 * names were never linked.
824 */
825 if (fvp == tvp) {
826 if (fvp->v_type == VDIR) {
827 /*
828 * Linked directories are impossible, so we must
829 * have lost the race. Pretend that the rename
830 * completed before the lookup.
831 */
832 error = ENOENT;
833 goto abortit;
834 }
835
836 /* Release destination completely. */
837 VOP_ABORTOP(tdvp, tcnp);
838 vput(tdvp);
839 vput(tvp);
840
841 /*
842 * Delete source. There is another race now that everything
843 * is unlocked, but this doesn't cause any new complications.
844 * relookup() may find a file that is unrelated to the
845 * original one, or it may fail. Too bad.
846 */
847 vrele(fvp);
848 fcnp->cn_flags &= ~MODMASK;
849 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
850 if ((fcnp->cn_flags & SAVESTART) == 0)
851 panic("ufs_rename: lost from startdir");
852 fcnp->cn_nameiop = DELETE;
853 if ((error = relookup(fdvp, &fvp, fcnp)) != 0)
854 return (error); /* relookup did vrele() */
855 vrele(fdvp);
856 return (VOP_REMOVE(fdvp, fvp, fcnp));
857 }
858
859 if ((error = vn_lock(fvp, LK_EXCLUSIVE, p)) != 0)
860 goto abortit;
861
862 /* fvp, tdvp, tvp now locked */
863 dp = VTOI(fdvp);
864 ip = VTOI(fvp);
865 if ((nlink_t)ip->i_ffs_nlink >= LINK_MAX) {
866 VOP_UNLOCK(fvp, 0, p);
867 error = EMLINK;
868 goto abortit;
869 }
870 if ((ip->i_ffs_flags & (IMMUTABLE | APPEND)) ||
871 (dp->i_ffs_flags & APPEND)) {
872 VOP_UNLOCK(fvp, 0, p);
873 error = EPERM;
874 goto abortit;
875 }
876 if ((ip->i_ffs_mode & IFMT) == IFDIR) {
877 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_proc);
878 if (!error && tvp)
879 error = VOP_ACCESS(tvp, VWRITE, tcnp->cn_cred, tcnp->cn_proc);
880 if (error) {
881 VOP_UNLOCK(fvp, 0, p);
882 error = EACCES;
883 goto abortit;
884 }
885 /*
886 * Avoid ".", "..", and aliases of "." for obvious reasons.
887 */
888 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
889 dp == ip ||
890 (fcnp->cn_flags & ISDOTDOT) ||
891 (tcnp->cn_flags & ISDOTDOT) ||
892 (ip->i_flag & IN_RENAME)) {
893 VOP_UNLOCK(fvp, 0, p);
894 error = EINVAL;
895 goto abortit;
896 }
897 ip->i_flag |= IN_RENAME;
898 oldparent = dp->i_number;
899 doingdirectory = 1;
900 }
901 VN_KNOTE(fdvp, NOTE_WRITE); /* XXX right place? */
902
903 /*
904 * When the target exists, both the directory
905 * and target vnodes are returned locked.
906 */
907 dp = VTOI(tdvp);
908 xp = NULL;
909 if (tvp)
910 xp = VTOI(tvp);
911
912 /*
913 * 1) Bump link count while we're moving stuff
914 * around. If we crash somewhere before
915 * completing our work, the link count
916 * may be wrong, but correctable.
917 */
918 ip->i_effnlink++;
919 ip->i_ffs_nlink++;
920 ip->i_flag |= IN_CHANGE;
921 if (DOINGSOFTDEP(fvp))
922 softdep_change_linkcnt(ip, 0);
923 if ((error = UFS_UPDATE(ip, !DOINGSOFTDEP(fvp))) != 0) {
924 VOP_UNLOCK(fvp, 0, p);
925 goto bad;
926 }
927
928 /*
929 * If ".." must be changed (ie the directory gets a new
930 * parent) then the source directory must not be in the
931 * directory hierarchy above the target, as this would
932 * orphan everything below the source directory. Also
933 * the user must have write permission in the source so
934 * as to be able to change "..". We must repeat the call
935 * to namei, as the parent directory is unlocked by the
936 * call to checkpath().
937 */
938 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_proc);
939 VOP_UNLOCK(fvp, 0, p);
940
941 /* tdvp and tvp locked */
942 if (oldparent != dp->i_number)
943 newparent = dp->i_number;
944 if (doingdirectory && newparent) {
945 if (error) /* write access check above */
946 goto bad;
947 if (xp != NULL)
948 vput(tvp);
949 /*
950 * Compensate for the reference ufs_checkpath() loses.
951 */
952 vref(tdvp);
953 /* Only tdvp is locked */
954 if ((error = ufs_checkpath(ip, dp, tcnp->cn_cred)) != 0)
955 goto out;
956 if ((tcnp->cn_flags & SAVESTART) == 0)
957 panic("ufs_rename: lost to startdir");
958 if ((error = relookup(tdvp, &tvp, tcnp)) != 0)
959 goto out;
960 dp = VTOI(tdvp);
961 xp = NULL;
962 if (tvp)
963 xp = VTOI(tvp);
964 }
965 /*
966 * 2) If target doesn't exist, link the target
967 * to the source and unlink the source.
968 * Otherwise, rewrite the target directory
969 * entry to reference the source inode and
970 * expunge the original entry's existence.
971 */
972 if (xp == NULL) {
973 if (dp->i_dev != ip->i_dev)
974 panic("rename: EXDEV");
975 /*
976 * Account for ".." in new directory.
977 * When source and destination have the same
978 * parent we don't fool with the link count.
979 */
980 if (doingdirectory && newparent) {
981 if ((nlink_t)dp->i_ffs_nlink >= LINK_MAX) {
982 error = EMLINK;
983 goto bad;
984 }
985 dp->i_effnlink++;
986 dp->i_ffs_nlink++;
987 dp->i_flag |= IN_CHANGE;
988 if (DOINGSOFTDEP(tdvp))
989 softdep_change_linkcnt(dp, 0);
990 if ((error = UFS_UPDATE(dp, !DOINGSOFTDEP(tdvp)))
991 != 0) {
992 dp->i_effnlink--;
993 dp->i_ffs_nlink--;
994 dp->i_flag |= IN_CHANGE;
995 if (DOINGSOFTDEP(tdvp))
996 softdep_change_linkcnt(dp, 0);
997 goto bad;
998 }
999 }
1000 ufs_makedirentry(ip, tcnp, &newdir);
1001 if ((error = ufs_direnter(tdvp, NULL, &newdir, tcnp, NULL)) != 0) {
1002 if (doingdirectory && newparent) {
1003 dp->i_effnlink--;
1004 dp->i_ffs_nlink--;
1005 dp->i_flag |= IN_CHANGE;
1006 if (DOINGSOFTDEP(tdvp))
1007 softdep_change_linkcnt(dp, 0);
1008 (void)UFS_UPDATE(dp, 1);
1009 }
1010 goto bad;
1011 }
1012 VN_KNOTE(tdvp, NOTE_WRITE);
1013 vput(tdvp);
1014 } else {
1015 if (xp->i_dev != dp->i_dev || xp->i_dev != ip->i_dev)
1016 panic("rename: EXDEV");
1017 /*
1018 * Short circuit rename(foo, foo).
1019 */
1020 if (xp->i_number == ip->i_number)
1021 panic("ufs_rename: same file");
1022 /*
1023 * If the parent directory is "sticky", then the user must
1024 * own the parent directory, or the destination of the rename,
1025 * otherwise the destination may not be changed (except by
1026 * root). This implements append-only directories.
1027 */
1028 if ((dp->i_ffs_mode & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 &&
1029 tcnp->cn_cred->cr_uid != dp->i_ffs_uid &&
1030 xp->i_ffs_uid != tcnp->cn_cred->cr_uid) {
1031 error = EPERM;
1032 goto bad;
1033 }
1034 /*
1035 * Target must be empty if a directory and have no links
1036 * to it. Also, ensure source and target are compatible
1037 * (both directories, or both not directories).
1038 */
1039 if ((xp->i_ffs_mode & IFMT) == IFDIR) {
1040 if (xp->i_effnlink > 2 ||
1041 !ufs_dirempty(xp, dp->i_number, tcnp->cn_cred)) {
1042 error = ENOTEMPTY;
1043 goto bad;
1044 }
1045 if (!doingdirectory) {
1046 error = ENOTDIR;
1047 goto bad;
1048 }
1049 cache_purge(tdvp);
1050 } else if (doingdirectory) {
1051 error = EISDIR;
1052 goto bad;
1053 }
1054
1055 if ((error = ufs_dirrewrite(dp, xp, ip->i_number,
1056 IFTODT(ip->i_ffs_mode), (doingdirectory && newparent) ?
1057 newparent : doingdirectory)) != 0)
1058 goto bad;
1059 if (doingdirectory) {
1060 if (!newparent) {
1061 dp->i_effnlink--;
1062 if (DOINGSOFTDEP(tdvp))
1063 softdep_change_linkcnt(dp, 0);
1064 }
1065 xp->i_effnlink--;
1066 if (DOINGSOFTDEP(tvp))
1067 softdep_change_linkcnt(xp, 0);
1068 }
1069 if (doingdirectory && !DOINGSOFTDEP(tvp)) {
1070 /*
1071 * Truncate inode. The only stuff left in the directory
1072 * is "." and "..". The "." reference is inconsequential
1073 * since we are quashing it. We have removed the "."
1074 * reference and the reference in the parent directory,
1075 * but there may be other hard links. The soft
1076 * dependency code will arrange to do these operations
1077 * after the parent directory entry has been deleted on
1078 * disk, so when running with that code we avoid doing
1079 * them now.
1080 */
1081 if (!newparent) {
1082 dp->i_ffs_nlink--;
1083 dp->i_flag |= IN_CHANGE;
1084 }
1085
1086 xp->i_ffs_nlink--;
1087 xp->i_flag |= IN_CHANGE;
1088 if ((error = UFS_TRUNCATE(VTOI(tvp), (off_t)0, IO_SYNC,
1089 tcnp->cn_cred)) != 0)
1090 goto bad;
1091 }
1092 VN_KNOTE(tdvp, NOTE_WRITE);
1093 vput(tdvp);
1094 VN_KNOTE(tvp, NOTE_DELETE);
1095 vput(tvp);
1096 xp = NULL;
1097 }
1098
1099 /*
1100 * 3) Unlink the source.
1101 */
1102 fcnp->cn_flags &= ~MODMASK;
1103 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
1104 if ((fcnp->cn_flags & SAVESTART) == 0)
1105 panic("ufs_rename: lost from startdir");
1106 if ((error = relookup(fdvp, &fvp, fcnp)) != 0) {
1107 vrele(ap->a_fvp);
1108 return (error);
1109 }
1110 vrele(fdvp);
1111 if (fvp == NULL) {
1112 /*
1113 * From name has disappeared.
1114 */
1115 if (doingdirectory)
1116 panic("ufs_rename: lost dir entry");
1117 vrele(ap->a_fvp);
1118 return (0);
1119 }
1120
1121 xp = VTOI(fvp);
1122 dp = VTOI(fdvp);
1123
1124 /*
1125 * Ensure that the directory entry still exists and has not
1126 * changed while the new name has been entered. If the source is
1127 * a file then the entry may have been unlinked or renamed. In
1128 * either case there is no further work to be done. If the source
1129 * is a directory then it cannot have been rmdir'ed; the IN_RENAME
1130 * flag ensures that it cannot be moved by another rename or removed
1131 * by a rmdir.
1132 */
1133 if (xp != ip) {
1134 if (doingdirectory)
1135 panic("ufs_rename: lost dir entry");
1136 } else {
1137 /*
1138 * If the source is a directory with a
1139 * new parent, the link count of the old
1140 * parent directory must be decremented
1141 * and ".." set to point to the new parent.
1142 */
1143 if (doingdirectory && newparent) {
1144 xp->i_offset = mastertemplate.dot_reclen;
1145 ufs_dirrewrite(xp, dp, newparent, DT_DIR, 0);
1146 cache_purge(fdvp);
1147 }
1148 error = ufs_dirremove(fdvp, xp, fcnp->cn_flags, 0);
1149 xp->i_flag &= ~IN_RENAME;
1150 }
1151 VN_KNOTE(fvp, NOTE_RENAME);
1152 if (dp)
1153 vput(fdvp);
1154 if (xp)
1155 vput(fvp);
1156 vrele(ap->a_fvp);
1157 return (error);
1158
1159 bad:
1160 if (xp)
1161 vput(ITOV(xp));
1162 vput(ITOV(dp));
1163 out:
1164 vrele(fdvp);
1165 if (doingdirectory)
1166 ip->i_flag &= ~IN_RENAME;
1167 if (vn_lock(fvp, LK_EXCLUSIVE, p) == 0) {
1168 ip->i_effnlink--;
1169 ip->i_ffs_nlink--;
1170 ip->i_flag |= IN_CHANGE;
1171 ip->i_flag &= ~IN_RENAME;
1172 if (DOINGSOFTDEP(fvp))
1173 softdep_change_linkcnt(ip, 0);
1174 vput(fvp);
1175 } else
1176 vrele(fvp);
1177 return (error);
1178 }
1179
1180 /*
1181 * Mkdir system call
1182 */
1183 int
ufs_mkdir(v)1184 ufs_mkdir(v)
1185 void *v;
1186 {
1187 struct vop_mkdir_args /* {
1188 struct vnode *a_dvp;
1189 struct vnode **a_vpp;
1190 struct componentname *a_cnp;
1191 struct vattr *a_vap;
1192 } */ *ap = v;
1193 struct vnode *dvp = ap->a_dvp;
1194 struct vattr *vap = ap->a_vap;
1195 struct componentname *cnp = ap->a_cnp;
1196 struct inode *ip, *dp;
1197 struct vnode *tvp;
1198 struct buf *bp;
1199 struct direct newdir;
1200 struct dirtemplate dirtemplate, *dtp;
1201 int error, dmode, blkoff;
1202
1203 #ifdef DIAGNOSTIC
1204 if ((cnp->cn_flags & HASBUF) == 0)
1205 panic("ufs_mkdir: no name");
1206 #endif
1207 dp = VTOI(dvp);
1208 if ((nlink_t)dp->i_ffs_nlink >= LINK_MAX) {
1209 error = EMLINK;
1210 goto out;
1211 }
1212 dmode = vap->va_mode & 0777;
1213 dmode |= IFDIR;
1214 /*
1215 * Must simulate part of ufs_makeinode here to acquire the inode,
1216 * but not have it entered in the parent directory. The entry is
1217 * made later after writing "." and ".." entries.
1218 */
1219 if ((error = UFS_INODE_ALLOC(dp, dmode, cnp->cn_cred, &tvp)) != 0)
1220 goto out;
1221 ip = VTOI(tvp);
1222 ip->i_ffs_uid = cnp->cn_cred->cr_uid;
1223 ip->i_ffs_gid = dp->i_ffs_gid;
1224
1225 if ((error = getinoquota(ip)) ||
1226 (error = ufs_quota_alloc_inode(ip, cnp->cn_cred))) {
1227 pool_put(&namei_pool, cnp->cn_pnbuf);
1228 UFS_INODE_FREE(ip, ip->i_number, dmode);
1229 vput(tvp);
1230 vput(dvp);
1231 return (error);
1232 }
1233
1234 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
1235 ip->i_ffs_mode = dmode;
1236 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */
1237 ip->i_effnlink = 2;
1238 ip->i_ffs_nlink = 2;
1239 if (DOINGSOFTDEP(tvp))
1240 softdep_change_linkcnt(ip, 0);
1241
1242 /*
1243 * Bump link count in parent directory to reflect work done below.
1244 * Should be done before reference is create so cleanup is
1245 * possible if we crash.
1246 */
1247 dp->i_effnlink++;
1248 dp->i_ffs_nlink++;
1249 dp->i_flag |= IN_CHANGE;
1250 if (DOINGSOFTDEP(dvp))
1251 softdep_change_linkcnt(dp, 0);
1252 if ((error = UFS_UPDATE(dp, !DOINGSOFTDEP(dvp))) != 0)
1253 goto bad;
1254
1255 /*
1256 * Initialize directory with "." and ".." from static template.
1257 */
1258 if (dvp->v_mount->mnt_maxsymlinklen > 0)
1259 dtp = &mastertemplate;
1260 else
1261 dtp = (struct dirtemplate *)&omastertemplate;
1262 dirtemplate = *dtp;
1263 dirtemplate.dot_ino = ip->i_number;
1264 dirtemplate.dotdot_ino = dp->i_number;
1265
1266 if ((error = UFS_BUF_ALLOC(ip, (off_t)0, DIRBLKSIZ, cnp->cn_cred,
1267 B_CLRBUF, &bp)) != 0)
1268 goto bad;
1269 ip->i_ffs_size = DIRBLKSIZ;
1270 ip->i_flag |= IN_CHANGE | IN_UPDATE;
1271 uvm_vnp_setsize(tvp, ip->i_ffs_size);
1272 bcopy((caddr_t)&dirtemplate, (caddr_t)bp->b_data, sizeof dirtemplate);
1273 if (DOINGSOFTDEP(tvp)) {
1274 /*
1275 * Ensure that the entire newly allocated block is a
1276 * valid directory so that future growth within the
1277 * block does not have to ensure that the block is
1278 * written before the inode
1279 */
1280 blkoff = DIRBLKSIZ;
1281 while (blkoff < bp->b_bcount) {
1282 ((struct direct *)
1283 (bp->b_data + blkoff))->d_reclen = DIRBLKSIZ;
1284 blkoff += DIRBLKSIZ;
1285 }
1286 }
1287 if ((error = UFS_UPDATE(ip, !DOINGSOFTDEP(tvp))) != 0) {
1288 (void)VOP_BWRITE(bp);
1289 goto bad;
1290 }
1291
1292 /*
1293 * Directory set up, now install it's entry in the parent directory.
1294 *
1295 * If we are not doing soft dependencies, then we must write out the
1296 * buffer containing the new directory body before entering the new
1297 * name in the parent. If we are doing soft dependencies, then the
1298 * buffer containing the new directory body will be passed to and
1299 * released in the soft dependency code after the code has attached
1300 * an appropriate ordering dependency to the buffer which ensures that
1301 * the buffer is written before the new name is written in the parent.
1302 */
1303 if (!DOINGSOFTDEP(dvp) && ((error = VOP_BWRITE(bp)) != 0))
1304 goto bad;
1305 ufs_makedirentry(ip, cnp, &newdir);
1306 error = ufs_direnter(dvp, tvp, &newdir, cnp, bp);
1307
1308 bad:
1309 if (error == 0) {
1310 VN_KNOTE(dvp, NOTE_WRITE);
1311 *ap->a_vpp = tvp;
1312 } else {
1313 dp->i_effnlink--;
1314 dp->i_ffs_nlink--;
1315 dp->i_flag |= IN_CHANGE;
1316 if (DOINGSOFTDEP(dvp))
1317 softdep_change_linkcnt(dp, 0);
1318 /*
1319 * No need to do an explicit VOP_TRUNCATE here, vrele will
1320 * do this for us because we set the link count to 0.
1321 */
1322 ip->i_effnlink = 0;
1323 ip->i_ffs_nlink = 0;
1324 ip->i_flag |= IN_CHANGE;
1325 if (DOINGSOFTDEP(tvp))
1326 softdep_change_linkcnt(ip, 0);
1327 vput(tvp);
1328 }
1329 out:
1330 pool_put(&namei_pool, cnp->cn_pnbuf);
1331 vput(dvp);
1332
1333 return (error);
1334 }
1335
1336 /*
1337 * Rmdir system call.
1338 */
1339 int
ufs_rmdir(v)1340 ufs_rmdir(v)
1341 void *v;
1342 {
1343 struct vop_rmdir_args /* {
1344 struct vnode *a_dvp;
1345 struct vnode *a_vp;
1346 struct componentname *a_cnp;
1347 } */ *ap = v;
1348 struct vnode *vp = ap->a_vp;
1349 struct vnode *dvp = ap->a_dvp;
1350 struct componentname *cnp = ap->a_cnp;
1351 struct inode *ip, *dp;
1352 int error;
1353
1354 ip = VTOI(vp);
1355 dp = VTOI(dvp);
1356 /*
1357 * No rmdir "." or of mounted on directories.
1358 */
1359 if (dp == ip || vp->v_mountedhere != 0) {
1360 if (dp == ip)
1361 vrele(dvp);
1362 else
1363 vput(dvp);
1364 vput(vp);
1365 return (EINVAL);
1366 }
1367 /*
1368 * Do not remove a directory that is in the process of being renamed.
1369 * Verify the directory is empty (and valid). Rmdir ".." will not be
1370 * valid since ".." will contain a reference to the current directory
1371 * and thus be non-empty.
1372 */
1373 error = 0;
1374 if (ip->i_flag & IN_RENAME) {
1375 error = EINVAL;
1376 goto out;
1377 }
1378 if (ip->i_effnlink != 2 ||
1379 !ufs_dirempty(ip, dp->i_number, cnp->cn_cred)) {
1380 error = ENOTEMPTY;
1381 goto out;
1382 }
1383 if ((dp->i_ffs_flags & APPEND) ||
1384 (ip->i_ffs_flags & (IMMUTABLE | APPEND))) {
1385 error = EPERM;
1386 goto out;
1387 }
1388 /*
1389 * Delete reference to directory before purging
1390 * inode. If we crash in between, the directory
1391 * will be reattached to lost+found,
1392 */
1393 dp->i_effnlink--;
1394 ip->i_effnlink--;
1395 if (DOINGSOFTDEP(vp)) {
1396 softdep_change_linkcnt(dp, 0);
1397 softdep_change_linkcnt(ip, 0);
1398 }
1399 if ((error = ufs_dirremove(dvp, ip, cnp->cn_flags, 1)) != 0) {
1400 dp->i_effnlink++;
1401 ip->i_effnlink++;
1402 if (DOINGSOFTDEP(vp)) {
1403 softdep_change_linkcnt(dp, 0);
1404 softdep_change_linkcnt(ip, 0);
1405 }
1406 goto out;
1407 }
1408
1409 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK);
1410 cache_purge(dvp);
1411 /*
1412 * Truncate inode. The only stuff left in the directory is "." and
1413 * "..". The "." reference is inconsequential since we are quashing
1414 * it. The soft dependency code will arrange to do these operations
1415 * after the parent directory entry has been deleted on disk, so
1416 * when running with that code we avoid doing them now.
1417 */
1418 if (!DOINGSOFTDEP(vp)) {
1419 int ioflag;
1420
1421 dp->i_ffs_nlink--;
1422 dp->i_flag |= IN_CHANGE;
1423 ip->i_ffs_nlink--;
1424 ip->i_flag |= IN_CHANGE;
1425 ioflag = DOINGASYNC(vp) ? 0 : IO_SYNC;
1426 error = UFS_TRUNCATE(ip, (off_t)0, ioflag, cnp->cn_cred);
1427 }
1428 cache_purge(vp);
1429 #ifdef UFS_DIRHASH
1430 /* Kill any active hash; i_effnlink == 0, so it will not come back. */
1431 if (ip->i_dirhash != NULL)
1432 ufsdirhash_free(ip);
1433 #endif
1434
1435 out:
1436 VN_KNOTE(vp, NOTE_DELETE);
1437 vput(dvp);
1438 vput(vp);
1439 return (error);
1440 }
1441
1442 /*
1443 * symlink -- make a symbolic link
1444 */
1445 int
ufs_symlink(v)1446 ufs_symlink(v)
1447 void *v;
1448 {
1449 struct vop_symlink_args /* {
1450 struct vnode *a_dvp;
1451 struct vnode **a_vpp;
1452 struct componentname *a_cnp;
1453 struct vattr *a_vap;
1454 char *a_target;
1455 } */ *ap = v;
1456 struct vnode *vp, **vpp = ap->a_vpp;
1457 struct inode *ip;
1458 int len, error;
1459
1460 error = ufs_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp,
1461 vpp, ap->a_cnp);
1462 if (error)
1463 return (error);
1464 VN_KNOTE(ap->a_dvp, NOTE_WRITE);
1465 vp = *vpp;
1466 len = strlen(ap->a_target);
1467 if (len < vp->v_mount->mnt_maxsymlinklen) {
1468 ip = VTOI(vp);
1469 bcopy(ap->a_target, (char *)ip->i_ffs_shortlink, len);
1470 ip->i_ffs_size = len;
1471 ip->i_flag |= IN_CHANGE | IN_UPDATE;
1472 } else
1473 error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0,
1474 UIO_SYSSPACE, IO_NODELOCKED, ap->a_cnp->cn_cred, NULL,
1475 (struct proc *)0);
1476 vput(vp);
1477 return (error);
1478 }
1479
1480 /*
1481 * Vnode op for reading directories.
1482 *
1483 * The routine below assumes that the on-disk format of a directory
1484 * is the same as that defined by <sys/dirent.h>. If the on-disk
1485 * format changes, then it will be necessary to do a conversion
1486 * from the on-disk format that read returns to the format defined
1487 * by <sys/dirent.h>.
1488 */
1489 int
ufs_readdir(v)1490 ufs_readdir(v)
1491 void *v;
1492 {
1493 struct vop_readdir_args /* {
1494 struct vnode *a_vp;
1495 struct uio *a_uio;
1496 struct ucred *a_cred;
1497 int *a_eofflag;
1498 u_long **a_cookies;
1499 int *ncookies;
1500 } */ *ap = v;
1501 struct uio *uio = ap->a_uio;
1502 int error;
1503 size_t count, lost;
1504 off_t off = uio->uio_offset;
1505
1506 count = uio->uio_resid;
1507 /* Make sure we don't return partial entries. */
1508 count -= (uio->uio_offset + count) & (DIRBLKSIZ -1);
1509 if (count <= 0)
1510 return (EINVAL);
1511 lost = uio->uio_resid - count;
1512 uio->uio_resid = count;
1513 uio->uio_iov->iov_len = count;
1514 # if (BYTE_ORDER == LITTLE_ENDIAN)
1515 if (ap->a_vp->v_mount->mnt_maxsymlinklen > 0) {
1516 error = VOP_READ(ap->a_vp, uio, 0, ap->a_cred);
1517 } else {
1518 struct dirent *dp, *edp;
1519 struct uio auio;
1520 struct iovec aiov;
1521 caddr_t dirbuf;
1522 int readcnt;
1523 u_char tmp;
1524
1525 auio = *uio;
1526 auio.uio_iov = &aiov;
1527 auio.uio_iovcnt = 1;
1528 auio.uio_segflg = UIO_SYSSPACE;
1529 aiov.iov_len = count;
1530 MALLOC(dirbuf, caddr_t, count, M_TEMP, M_WAITOK);
1531 aiov.iov_base = dirbuf;
1532 error = VOP_READ(ap->a_vp, &auio, 0, ap->a_cred);
1533 if (error == 0) {
1534 readcnt = count - auio.uio_resid;
1535 edp = (struct dirent *)&dirbuf[readcnt];
1536 for (dp = (struct dirent *)dirbuf; dp < edp; ) {
1537 tmp = dp->d_namlen;
1538 dp->d_namlen = dp->d_type;
1539 dp->d_type = tmp;
1540 if (dp->d_reclen > 0) {
1541 dp = (struct dirent *)
1542 ((char *)dp + dp->d_reclen);
1543 } else {
1544 error = EIO;
1545 break;
1546 }
1547 }
1548 if (dp >= edp)
1549 error = uiomove(dirbuf, readcnt, uio);
1550 }
1551 FREE(dirbuf, M_TEMP);
1552 }
1553 # else
1554 error = VOP_READ(ap->a_vp, uio, 0, ap->a_cred);
1555 # endif
1556 if (!error && ap->a_ncookies) {
1557 struct dirent *dp, *dpstart;
1558 off_t offstart;
1559 u_long *cookies;
1560 int ncookies;
1561
1562 /*
1563 * Only the NFS server and emulations use cookies, and they
1564 * load the directory block into system space, so we can
1565 * just look at it directly.
1566 */
1567 if (uio->uio_segflg != UIO_SYSSPACE || uio->uio_iovcnt != 1)
1568 panic("ufs_readdir: lost in space");
1569
1570 dpstart = (struct dirent *)
1571 (uio->uio_iov->iov_base - (uio->uio_offset - off));
1572 offstart = off;
1573 for (dp = dpstart, ncookies = 0; off < uio->uio_offset; ) {
1574 if (dp->d_reclen == 0)
1575 break;
1576 off += dp->d_reclen;
1577 ncookies++;
1578 dp = (struct dirent *)((caddr_t)dp + dp->d_reclen);
1579 }
1580 lost += uio->uio_offset - off;
1581 uio->uio_offset = off;
1582 MALLOC(cookies, u_long *, ncookies * sizeof(u_long), M_TEMP,
1583 M_WAITOK);
1584 *ap->a_ncookies = ncookies;
1585 *ap->a_cookies = cookies;
1586 for (off = offstart, dp = dpstart; off < uio->uio_offset; ) {
1587 off += dp->d_reclen;
1588 *cookies = off;
1589 cookies++;
1590 dp = (struct dirent *)((caddr_t)dp + dp->d_reclen);
1591 }
1592 }
1593 uio->uio_resid += lost;
1594 *ap->a_eofflag = VTOI(ap->a_vp)->i_ffs_size <= uio->uio_offset;
1595 return (error);
1596 }
1597
1598 /*
1599 * Return target name of a symbolic link
1600 */
1601 int
ufs_readlink(v)1602 ufs_readlink(v)
1603 void *v;
1604 {
1605 struct vop_readlink_args /* {
1606 struct vnode *a_vp;
1607 struct uio *a_uio;
1608 struct ucred *a_cred;
1609 } */ *ap = v;
1610 struct vnode *vp = ap->a_vp;
1611 struct inode *ip = VTOI(vp);
1612 int isize;
1613
1614 isize = ip->i_ffs_size;
1615 if (isize < vp->v_mount->mnt_maxsymlinklen ||
1616 (vp->v_mount->mnt_maxsymlinklen == 0 && ip->i_ffs_blocks == 0)) {
1617 uiomove((char *)ip->i_ffs_shortlink, isize, ap->a_uio);
1618 return (0);
1619 }
1620 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred));
1621 }
1622
1623 /*
1624 * Lock an inode. If its already locked, set the WANT bit and sleep.
1625 */
1626 int
ufs_lock(v)1627 ufs_lock(v)
1628 void *v;
1629 {
1630 struct vop_lock_args /* {
1631 struct vnode *a_vp;
1632 int a_flags;
1633 struct proc *a_p;
1634 } */ *ap = v;
1635 struct vnode *vp = ap->a_vp;
1636
1637 return (lockmgr(&VTOI(vp)->i_lock, ap->a_flags, &vp->v_interlock,
1638 ap->a_p));
1639 }
1640
1641 /*
1642 * Unlock an inode. If WANT bit is on, wakeup.
1643 */
1644 int
ufs_unlock(v)1645 ufs_unlock(v)
1646 void *v;
1647 {
1648 struct vop_unlock_args /* {
1649 struct vnode *a_vp;
1650 int a_flags;
1651 struct proc *a_p;
1652 } */ *ap = v;
1653 struct vnode *vp = ap->a_vp;
1654
1655 return (lockmgr(&VTOI(vp)->i_lock, ap->a_flags | LK_RELEASE,
1656 &vp->v_interlock, ap->a_p));
1657 }
1658
1659 /*
1660 * Check for a locked inode.
1661 */
1662 int
ufs_islocked(v)1663 ufs_islocked(v)
1664 void *v;
1665 {
1666 struct vop_islocked_args /* {
1667 struct vnode *a_vp;
1668 } */ *ap = v;
1669
1670 return (lockstatus(&VTOI(ap->a_vp)->i_lock));
1671 }
1672
1673 /*
1674 * Calculate the logical to physical mapping if not done already,
1675 * then call the device strategy routine.
1676 */
1677 int
ufs_strategy(v)1678 ufs_strategy(v)
1679 void *v;
1680 {
1681 struct vop_strategy_args /* {
1682 struct buf *a_bp;
1683 } */ *ap = v;
1684 struct buf *bp = ap->a_bp;
1685 struct vnode *vp = bp->b_vp;
1686 struct inode *ip;
1687 int error;
1688 int s;
1689
1690 ip = VTOI(vp);
1691 if (vp->v_type == VBLK || vp->v_type == VCHR)
1692 panic("ufs_strategy: spec");
1693 if (bp->b_blkno == bp->b_lblkno) {
1694 error = VOP_BMAP(vp, bp->b_lblkno, NULL, &bp->b_blkno,
1695 NULL);
1696 if (error) {
1697 bp->b_error = error;
1698 bp->b_flags |= B_ERROR;
1699 s = splbio();
1700 biodone(bp);
1701 splx(s);
1702 return (error);
1703 }
1704 if ((long)bp->b_blkno == -1)
1705 clrbuf(bp);
1706 }
1707 if ((long)bp->b_blkno == -1) {
1708 s = splbio();
1709 biodone(bp);
1710 splx(s);
1711 return (0);
1712 }
1713 vp = ip->i_devvp;
1714 bp->b_dev = vp->v_rdev;
1715 VOCALL (vp->v_op, VOFFSET(vop_strategy), ap);
1716 return (0);
1717 }
1718
1719 /*
1720 * Print out the contents of an inode.
1721 */
1722 int
ufs_print(v)1723 ufs_print(v)
1724 void *v;
1725 {
1726 struct vop_print_args /* {
1727 struct vnode *a_vp;
1728 } */ *ap = v;
1729 struct vnode *vp = ap->a_vp;
1730 struct inode *ip = VTOI(vp);
1731
1732 printf("tag VT_UFS, ino %d, on dev %d, %d", ip->i_number,
1733 major(ip->i_dev), minor(ip->i_dev));
1734 printf(" flags 0x%x, effnlink %d, nlink %d\n",
1735 ip->i_flag, ip->i_effnlink, ip->i_ffs_nlink);
1736 printf("\tmode 0%o, owner %d, group %d, size %lld",
1737 ip->i_ffs_mode, ip->i_ffs_uid, ip->i_ffs_gid, ip->i_ffs_size);
1738
1739 #ifdef FIFO
1740 if (vp->v_type == VFIFO)
1741 fifo_printinfo(vp);
1742 #endif /* FIFO */
1743 lockmgr_printinfo(&ip->i_lock);
1744 printf("\n");
1745 return (0);
1746 }
1747
1748 /*
1749 * Read wrapper for special devices.
1750 */
1751 int
ufsspec_read(v)1752 ufsspec_read(v)
1753 void *v;
1754 {
1755 struct vop_read_args /* {
1756 struct vnode *a_vp;
1757 struct uio *a_uio;
1758 int a_ioflag;
1759 struct ucred *a_cred;
1760 } */ *ap = v;
1761
1762 /*
1763 * Set access flag.
1764 */
1765 VTOI(ap->a_vp)->i_flag |= IN_ACCESS;
1766 return (VOCALL (spec_vnodeop_p, VOFFSET(vop_read), ap));
1767 }
1768
1769 /*
1770 * Write wrapper for special devices.
1771 */
1772 int
ufsspec_write(v)1773 ufsspec_write(v)
1774 void *v;
1775 {
1776 struct vop_write_args /* {
1777 struct vnode *a_vp;
1778 struct uio *a_uio;
1779 int a_ioflag;
1780 struct ucred *a_cred;
1781 } */ *ap = v;
1782
1783 /*
1784 * Set update and change flags.
1785 */
1786 VTOI(ap->a_vp)->i_flag |= IN_CHANGE | IN_UPDATE;
1787 return (VOCALL (spec_vnodeop_p, VOFFSET(vop_write), ap));
1788 }
1789
1790 /*
1791 * Close wrapper for special devices.
1792 *
1793 * Update the times on the inode then do device close.
1794 */
1795 int
ufsspec_close(v)1796 ufsspec_close(v)
1797 void *v;
1798 {
1799 struct vop_close_args /* {
1800 struct vnode *a_vp;
1801 int a_fflag;
1802 struct ucred *a_cred;
1803 struct proc *a_p;
1804 } */ *ap = v;
1805 struct vnode *vp = ap->a_vp;
1806 struct inode *ip = VTOI(vp);
1807
1808 simple_lock(&vp->v_interlock);
1809 if (ap->a_vp->v_usecount > 1)
1810 ITIMES(ip, &time, &time);
1811 simple_unlock(&vp->v_interlock);
1812 return (VOCALL (spec_vnodeop_p, VOFFSET(vop_close), ap));
1813 }
1814
1815 #ifdef FIFO
1816 /*
1817 * Read wrapper for fifo's
1818 */
1819 int
ufsfifo_read(v)1820 ufsfifo_read(v)
1821 void *v;
1822 {
1823 struct vop_read_args /* {
1824 struct vnode *a_vp;
1825 struct uio *a_uio;
1826 int a_ioflag;
1827 struct ucred *a_cred;
1828 } */ *ap = v;
1829 extern int (**fifo_vnodeop_p)(void *);
1830
1831 /*
1832 * Set access flag.
1833 */
1834 VTOI(ap->a_vp)->i_flag |= IN_ACCESS;
1835 return (VOCALL (fifo_vnodeop_p, VOFFSET(vop_read), ap));
1836 }
1837
1838 /*
1839 * Write wrapper for fifo's.
1840 */
1841 int
ufsfifo_write(v)1842 ufsfifo_write(v)
1843 void *v;
1844 {
1845 struct vop_write_args /* {
1846 struct vnode *a_vp;
1847 struct uio *a_uio;
1848 int a_ioflag;
1849 struct ucred *a_cred;
1850 } */ *ap = v;
1851 extern int (**fifo_vnodeop_p)(void *);
1852
1853 /*
1854 * Set update and change flags.
1855 */
1856 VTOI(ap->a_vp)->i_flag |= IN_CHANGE | IN_UPDATE;
1857 return (VOCALL (fifo_vnodeop_p, VOFFSET(vop_write), ap));
1858 }
1859
1860 /*
1861 * Close wrapper for fifo's.
1862 *
1863 * Update the times on the inode then do device close.
1864 */
1865 int
ufsfifo_close(v)1866 ufsfifo_close(v)
1867 void *v;
1868 {
1869 struct vop_close_args /* {
1870 struct vnode *a_vp;
1871 int a_fflag;
1872 struct ucred *a_cred;
1873 struct proc *a_p;
1874 } */ *ap = v;
1875 extern int (**fifo_vnodeop_p)(void *);
1876 struct vnode *vp = ap->a_vp;
1877 struct inode *ip = VTOI(vp);
1878
1879 simple_lock(&vp->v_interlock);
1880 if (ap->a_vp->v_usecount > 1)
1881 ITIMES(ip, &time, &time);
1882 simple_unlock(&vp->v_interlock);
1883 return (VOCALL (fifo_vnodeop_p, VOFFSET(vop_close), ap));
1884 }
1885 #endif /* FIFO */
1886
1887 /*
1888 * Return POSIX pathconf information applicable to ufs filesystems.
1889 */
1890 int
ufs_pathconf(v)1891 ufs_pathconf(v)
1892 void *v;
1893 {
1894 struct vop_pathconf_args /* {
1895 struct vnode *a_vp;
1896 int a_name;
1897 register_t *a_retval;
1898 } */ *ap = v;
1899
1900 switch (ap->a_name) {
1901 case _PC_LINK_MAX:
1902 *ap->a_retval = LINK_MAX;
1903 return (0);
1904 case _PC_NAME_MAX:
1905 *ap->a_retval = NAME_MAX;
1906 return (0);
1907 case _PC_PATH_MAX:
1908 *ap->a_retval = PATH_MAX;
1909 return (0);
1910 case _PC_PIPE_BUF:
1911 *ap->a_retval = PIPE_BUF;
1912 return (0);
1913 case _PC_CHOWN_RESTRICTED:
1914 *ap->a_retval = 1;
1915 return (0);
1916 case _PC_NO_TRUNC:
1917 *ap->a_retval = 1;
1918 return (0);
1919 default:
1920 return (EINVAL);
1921 }
1922 /* NOTREACHED */
1923 }
1924
1925 /*
1926 * Advisory record locking support
1927 */
1928 int
ufs_advlock(v)1929 ufs_advlock(v)
1930 void *v;
1931 {
1932 struct vop_advlock_args /* {
1933 struct vnode *a_vp;
1934 caddr_t a_id;
1935 int a_op;
1936 struct flock *a_fl;
1937 int a_flags;
1938 } */ *ap = v;
1939 struct inode *ip = VTOI(ap->a_vp);
1940
1941 return (lf_advlock(&ip->i_lockf, ip->i_ffs_size, ap->a_id, ap->a_op,
1942 ap->a_fl, ap->a_flags));
1943 }
1944
1945 /*
1946 * Initialize the vnode associated with a new inode, handle aliased
1947 * vnodes.
1948 */
1949 int
ufs_vinit(mntp,specops,fifoops,vpp)1950 ufs_vinit(mntp, specops, fifoops, vpp)
1951 struct mount *mntp;
1952 int (**specops)(void *);
1953 int (**fifoops)(void *);
1954 struct vnode **vpp;
1955 {
1956 struct inode *ip;
1957 struct vnode *vp, *nvp;
1958
1959 vp = *vpp;
1960 ip = VTOI(vp);
1961 switch(vp->v_type = IFTOVT(ip->i_ffs_mode)) {
1962 case VCHR:
1963 case VBLK:
1964 vp->v_op = specops;
1965 if ((nvp = checkalias(vp, ip->i_ffs_rdev, mntp)) != NULL) {
1966 /*
1967 * Discard unneeded vnode, but save its inode.
1968 * Note that the lock is carried over in the inode
1969 * to the replacement vnode.
1970 */
1971 nvp->v_data = vp->v_data;
1972 vp->v_data = NULL;
1973 vp->v_op = spec_vnodeop_p;
1974 #ifdef VFSDEBUG
1975 vp->v_flag &= ~VLOCKSWORK;
1976 #endif
1977 vrele(vp);
1978 vgone(vp);
1979 /*
1980 * Reinitialize aliased inode.
1981 */
1982 vp = nvp;
1983 ip->i_vnode = vp;
1984 }
1985 break;
1986 case VFIFO:
1987 #ifdef FIFO
1988 vp->v_op = fifoops;
1989 break;
1990 #else
1991 return (EOPNOTSUPP);
1992 #endif
1993 case VNON:
1994 case VBAD:
1995 case VSOCK:
1996 case VLNK:
1997 case VDIR:
1998 case VREG:
1999 break;
2000 }
2001 if (ip->i_number == ROOTINO)
2002 vp->v_flag |= VROOT;
2003 /*
2004 * Initialize modrev times
2005 */
2006 SETHIGH(ip->i_modrev, mono_time.tv_sec);
2007 SETLOW(ip->i_modrev, mono_time.tv_usec * 4294);
2008 *vpp = vp;
2009 return (0);
2010 }
2011
2012 /*
2013 * Allocate a new inode.
2014 */
2015 int
ufs_makeinode(mode,dvp,vpp,cnp)2016 ufs_makeinode(mode, dvp, vpp, cnp)
2017 int mode;
2018 struct vnode *dvp;
2019 struct vnode **vpp;
2020 struct componentname *cnp;
2021 {
2022 struct inode *ip, *pdir;
2023 struct direct newdir;
2024 struct vnode *tvp;
2025 int error;
2026
2027 pdir = VTOI(dvp);
2028 #ifdef DIAGNOSTIC
2029 if ((cnp->cn_flags & HASBUF) == 0)
2030 panic("ufs_makeinode: no name");
2031 #endif
2032 *vpp = NULL;
2033 if ((mode & IFMT) == 0)
2034 mode |= IFREG;
2035
2036 if ((error = UFS_INODE_ALLOC(pdir, mode, cnp->cn_cred, &tvp)) != 0) {
2037 pool_put(&namei_pool, cnp->cn_pnbuf);
2038 vput(dvp);
2039 return (error);
2040 }
2041 ip = VTOI(tvp);
2042 ip->i_ffs_gid = pdir->i_ffs_gid;
2043 ip->i_ffs_uid = cnp->cn_cred->cr_uid;
2044
2045 if ((error = getinoquota(ip)) ||
2046 (error = ufs_quota_alloc_inode(ip, cnp->cn_cred))) {
2047 pool_put(&namei_pool, cnp->cn_pnbuf);
2048 UFS_INODE_FREE(ip, ip->i_number, mode);
2049 vput(tvp);
2050 vput(dvp);
2051 return (error);
2052 }
2053
2054 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
2055 ip->i_ffs_mode = mode;
2056 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */
2057 ip->i_effnlink = 1;
2058 ip->i_ffs_nlink = 1;
2059 if (DOINGSOFTDEP(tvp))
2060 softdep_change_linkcnt(ip, 0);
2061 if ((ip->i_ffs_mode & ISGID) &&
2062 !groupmember(ip->i_ffs_gid, cnp->cn_cred) &&
2063 suser_ucred(cnp->cn_cred))
2064 ip->i_ffs_mode &= ~ISGID;
2065
2066 /*
2067 * Make sure inode goes to disk before directory entry.
2068 */
2069 if ((error = UFS_UPDATE(ip, !DOINGSOFTDEP(tvp))) != 0)
2070 goto bad;
2071
2072 ufs_makedirentry(ip, cnp, &newdir);
2073 if ((error = ufs_direnter(dvp, tvp, &newdir, cnp, NULL)) != 0)
2074 goto bad;
2075
2076 if ((cnp->cn_flags & SAVESTART) == 0)
2077 pool_put(&namei_pool, cnp->cn_pnbuf);
2078 vput(dvp);
2079 *vpp = tvp;
2080 return (0);
2081
2082 bad:
2083 /*
2084 * Write error occurred trying to update the inode
2085 * or the directory so must deallocate the inode.
2086 */
2087 pool_put(&namei_pool, cnp->cn_pnbuf);
2088 vput(dvp);
2089 ip->i_effnlink = 0;
2090 ip->i_ffs_nlink = 0;
2091 ip->i_flag |= IN_CHANGE;
2092 if (DOINGSOFTDEP(tvp))
2093 softdep_change_linkcnt(ip, 0);
2094 tvp->v_type = VNON;
2095 vput(tvp);
2096
2097 return (error);
2098 }
2099
2100 struct filterops ufsread_filtops =
2101 { 1, NULL, filt_ufsdetach, filt_ufsread };
2102 struct filterops ufswrite_filtops =
2103 { 1, NULL, filt_ufsdetach, filt_ufswrite };
2104 struct filterops ufsvnode_filtops =
2105 { 1, NULL, filt_ufsdetach, filt_ufsvnode };
2106
2107 int
ufs_kqfilter(v)2108 ufs_kqfilter(v)
2109 void *v;
2110 {
2111 struct vop_kqfilter_args /* {
2112 struct vnode *a_vp;
2113 struct knote *a_kn;
2114 } */ *ap = v;
2115 struct vnode *vp = ap->a_vp;
2116 struct knote *kn = ap->a_kn;
2117
2118 switch (kn->kn_filter) {
2119 case EVFILT_READ:
2120 kn->kn_fop = &ufsread_filtops;
2121 break;
2122 case EVFILT_WRITE:
2123 kn->kn_fop = &ufswrite_filtops;
2124 break;
2125 case EVFILT_VNODE:
2126 kn->kn_fop = &ufsvnode_filtops;
2127 break;
2128 default:
2129 return (1);
2130 }
2131
2132 kn->kn_hook = (caddr_t)vp;
2133
2134 simple_lock(&vp->v_selectinfo.vsi_lock);
2135 SLIST_INSERT_HEAD(&vp->v_selectinfo.vsi_selinfo.si_note, kn, kn_selnext);
2136 simple_unlock(&vp->v_selectinfo.vsi_lock);
2137
2138 return (0);
2139 }
2140
2141 void
filt_ufsdetach(struct knote * kn)2142 filt_ufsdetach(struct knote *kn)
2143 {
2144 struct vnode *vp = (struct vnode *)kn->kn_hook;
2145
2146 simple_lock(&vp->v_selectinfo.vsi_lock);
2147 SLIST_REMOVE(&vp->v_selectinfo.vsi_selinfo.si_note,
2148 kn, knote, kn_selnext);
2149 simple_unlock(&vp->v_selectinfo.vsi_lock);
2150 }
2151
2152 /*ARGSUSED*/
2153 int
filt_ufsread(struct knote * kn,long hint)2154 filt_ufsread(struct knote *kn, long hint)
2155 {
2156 struct vnode *vp = (struct vnode *)kn->kn_hook;
2157 struct inode *ip = VTOI(vp);
2158
2159 /*
2160 * filesystem is gone, so set the EOF flag and schedule
2161 * the knote for deletion.
2162 */
2163 if (hint == NOTE_REVOKE) {
2164 kn->kn_flags |= (EV_EOF | EV_ONESHOT);
2165 return (1);
2166 }
2167
2168 kn->kn_data = ip->i_ffs_size - kn->kn_fp->f_offset;
2169 if (kn->kn_data == 0 && kn->kn_sfflags & NOTE_EOF) {
2170 kn->kn_fflags |= NOTE_EOF;
2171 return (1);
2172 }
2173
2174 return (kn->kn_data != 0);
2175 }
2176
2177 int
filt_ufswrite(struct knote * kn,long hint)2178 filt_ufswrite(struct knote *kn, long hint)
2179 {
2180 /*
2181 * filesystem is gone, so set the EOF flag and schedule
2182 * the knote for deletion.
2183 */
2184 if (hint == NOTE_REVOKE) {
2185 kn->kn_flags |= (EV_EOF | EV_ONESHOT);
2186 return (1);
2187 }
2188
2189 kn->kn_data = 0;
2190 return (1);
2191 }
2192
2193 int
filt_ufsvnode(struct knote * kn,long hint)2194 filt_ufsvnode(struct knote *kn, long hint)
2195 {
2196 if (kn->kn_sfflags & hint)
2197 kn->kn_fflags |= hint;
2198 if (hint == NOTE_REVOKE) {
2199 kn->kn_flags |= EV_EOF;
2200 return (1);
2201 }
2202 return (kn->kn_fflags != 0);
2203 }
2204