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1.1 nbrk 1: /* $OpenBSD: ufs_vnops.c,v 1.82 2007/06/20 15:03:40 thib 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 *, long);
77: int filt_ufswrite(struct knote *, long);
78: int filt_ufsvnode(struct knote *, long);
79: void filt_ufsdetach(struct knote *);
80:
81: union _qcvt {
82: int64_t qcvt;
83: int32_t val[2];
84: };
85:
86: #define SETHIGH(q, h) { \
87: union _qcvt tmp; \
88: tmp.qcvt = (q); \
89: tmp.val[_QUAD_HIGHWORD] = (h); \
90: (q) = tmp.qcvt; \
91: }
92: #define SETLOW(q, l) { \
93: union _qcvt tmp; \
94: tmp.qcvt = (q); \
95: tmp.val[_QUAD_LOWWORD] = (l); \
96: (q) = tmp.qcvt; \
97: }
98:
99: /*
100: * A virgin directory (no blushing please).
101: */
102: static struct dirtemplate mastertemplate = {
103: 0, 12, DT_DIR, 1, ".",
104: 0, DIRBLKSIZ - 12, DT_DIR, 2, ".."
105: };
106: static struct odirtemplate omastertemplate = {
107: 0, 12, 1, ".",
108: 0, DIRBLKSIZ - 12, 2, ".."
109: };
110:
111: /*
112: * Create a regular file
113: */
114: int
115: ufs_create(void *v)
116: {
117: struct vop_create_args *ap = v;
118: int error;
119:
120: error =
121: ufs_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode),
122: ap->a_dvp, ap->a_vpp, ap->a_cnp);
123: if (error)
124: return (error);
125: VN_KNOTE(ap->a_dvp, NOTE_WRITE);
126: return (0);
127: }
128:
129: /*
130: * Mknod vnode call
131: */
132: /* ARGSUSED */
133: int
134: ufs_mknod(void *v)
135: {
136: struct vop_mknod_args *ap = v;
137: struct vattr *vap = ap->a_vap;
138: struct vnode **vpp = ap->a_vpp;
139: struct inode *ip;
140: int error;
141:
142: if ((error =
143: ufs_makeinode(MAKEIMODE(vap->va_type, vap->va_mode),
144: ap->a_dvp, vpp, ap->a_cnp)) != 0)
145: return (error);
146: VN_KNOTE(ap->a_dvp, NOTE_WRITE);
147: ip = VTOI(*vpp);
148: ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
149: if (vap->va_rdev != VNOVAL) {
150: /*
151: * Want to be able to use this to make badblock
152: * inodes, so don't truncate the dev number.
153: */
154: DIP_ASSIGN(ip, rdev, vap->va_rdev);
155: }
156: /*
157: * Remove inode so that it will be reloaded by VFS_VGET and
158: * checked to see if it is an alias of an existing entry in
159: * the inode cache.
160: */
161: vput(*vpp);
162: (*vpp)->v_type = VNON;
163: vgone(*vpp);
164: *vpp = 0;
165: return (0);
166: }
167:
168: /*
169: * Open called.
170: *
171: * Nothing to do.
172: */
173: /* ARGSUSED */
174: int
175: ufs_open(void *v)
176: {
177: struct vop_open_args *ap = v;
178: struct inode *ip = VTOI(ap->a_vp);
179:
180: /*
181: * Files marked append-only must be opened for appending.
182: */
183: if ((DIP(ip, flags) & APPEND) &&
184: (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE)
185: return (EPERM);
186:
187: if (ap->a_mode & O_TRUNC)
188: ip->i_flag |= IN_CHANGE | IN_UPDATE;
189:
190: return (0);
191: }
192:
193: /*
194: * Close called.
195: *
196: * Update the times on the inode.
197: */
198: /* ARGSUSED */
199: int
200: ufs_close(void *v)
201: {
202: struct vop_close_args *ap = v;
203: struct vnode *vp = ap->a_vp;
204: struct inode *ip = VTOI(vp);
205:
206: if (vp->v_usecount > 1) {
207: struct timeval tv;
208:
209: getmicrotime(&tv);
210: ITIMES(ip, &tv, &tv);
211: }
212: return (0);
213: }
214:
215: int
216: ufs_access(void *v)
217: {
218: struct vop_access_args *ap = v;
219: struct vnode *vp = ap->a_vp;
220: struct inode *ip = VTOI(vp);
221: mode_t mode = ap->a_mode;
222:
223: /*
224: * Disallow write attempts on read-only file systems;
225: * unless the file is a socket, fifo, or a block or
226: * character device resident on the file system.
227: */
228: if (mode & VWRITE) {
229: switch (vp->v_type) {
230: int error;
231: case VDIR:
232: case VLNK:
233: case VREG:
234: if (vp->v_mount->mnt_flag & MNT_RDONLY)
235: return (EROFS);
236:
237: if ((error = getinoquota(ip)) != 0)
238: return (error);
239: break;
240: case VBAD:
241: case VBLK:
242: case VCHR:
243: case VSOCK:
244: case VFIFO:
245: case VNON:
246: break;
247:
248: }
249: }
250:
251: /* If immutable bit set, nobody gets to write it. */
252: if ((mode & VWRITE) && (DIP(ip, flags) & IMMUTABLE))
253: return (EPERM);
254:
255: return (vaccess(DIP(ip, mode), DIP(ip, uid), DIP(ip, gid), mode,
256: ap->a_cred));
257: }
258:
259: /* ARGSUSED */
260: int
261: ufs_getattr(void *v)
262: {
263: struct vop_getattr_args *ap = v;
264: struct vnode *vp = ap->a_vp;
265: struct inode *ip = VTOI(vp);
266: struct vattr *vap = ap->a_vap;
267: struct timeval tv;
268:
269: getmicrotime(&tv);
270: ITIMES(ip, &tv, &tv);
271: /*
272: * Copy from inode table
273: */
274: vap->va_fsid = ip->i_dev;
275: vap->va_fileid = ip->i_number;
276: vap->va_mode = DIP(ip, mode) & ~IFMT;
277: vap->va_nlink = ip->i_effnlink;
278: vap->va_uid = DIP(ip, uid);
279: vap->va_gid = DIP(ip, gid);
280: vap->va_rdev = (dev_t) DIP(ip, rdev);
281: vap->va_size = DIP(ip, size);
282: vap->va_atime.tv_sec = DIP(ip, atime);
283: vap->va_atime.tv_nsec = DIP(ip, atimensec);
284: vap->va_mtime.tv_sec = DIP(ip, mtime);
285: vap->va_mtime.tv_nsec = DIP(ip, mtimensec);
286: vap->va_ctime.tv_sec = DIP(ip, ctime);
287: vap->va_ctime.tv_nsec = DIP(ip, ctimensec);
288: vap->va_flags = DIP(ip, flags);
289: vap->va_gen = DIP(ip, gen);
290: /* this doesn't belong here */
291: if (vp->v_type == VBLK)
292: vap->va_blocksize = BLKDEV_IOSIZE;
293: else if (vp->v_type == VCHR)
294: vap->va_blocksize = MAXBSIZE;
295: else
296: vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize;
297: vap->va_bytes = dbtob((u_quad_t) DIP(ip, blocks));
298: vap->va_type = vp->v_type;
299: vap->va_filerev = ip->i_modrev;
300: return (0);
301: }
302:
303: /*
304: * Set attribute vnode op. called from several syscalls
305: */
306: int
307: ufs_setattr(void *v)
308: {
309: struct vop_setattr_args *ap = v;
310: struct vattr *vap = ap->a_vap;
311: struct vnode *vp = ap->a_vp;
312: struct inode *ip = VTOI(vp);
313: struct ucred *cred = ap->a_cred;
314: struct proc *p = ap->a_p;
315: int error;
316: long hint = NOTE_ATTRIB;
317: u_quad_t oldsize;
318:
319: /*
320: * Check for unsettable attributes.
321: */
322: if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
323: (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
324: (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
325: ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
326: return (EINVAL);
327: }
328: if (vap->va_flags != VNOVAL) {
329: if (vp->v_mount->mnt_flag & MNT_RDONLY)
330: return (EROFS);
331: if (cred->cr_uid != DIP(ip, uid) &&
332: (error = suser_ucred(cred)))
333: return (error);
334: if (cred->cr_uid == 0) {
335: if ((DIP(ip, flags) & (SF_IMMUTABLE | SF_APPEND)) &&
336: securelevel > 0)
337: return (EPERM);
338: DIP_ASSIGN(ip, flags, vap->va_flags);
339: } else {
340: if (DIP(ip, flags) & (SF_IMMUTABLE | SF_APPEND) ||
341: (vap->va_flags & UF_SETTABLE) != vap->va_flags)
342: return (EPERM);
343: DIP(ip, flags) &= SF_SETTABLE;
344: DIP(ip, flags) |= (vap->va_flags & UF_SETTABLE);
345: }
346: ip->i_flag |= IN_CHANGE;
347: if (vap->va_flags & (IMMUTABLE | APPEND))
348: return (0);
349: }
350: if (DIP(ip, flags) & (IMMUTABLE | APPEND))
351: return (EPERM);
352: /*
353: * Go through the fields and update if not VNOVAL.
354: */
355: if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
356: if (vp->v_mount->mnt_flag & MNT_RDONLY)
357: return (EROFS);
358: error = ufs_chown(vp, vap->va_uid, vap->va_gid, cred, p);
359: if (error)
360: return (error);
361: }
362: if (vap->va_size != VNOVAL) {
363: oldsize = DIP(ip, size);
364: /*
365: * Disallow write attempts on read-only file systems;
366: * unless the file is a socket, fifo, or a block or
367: * character device resident on the file system.
368: */
369: switch (vp->v_type) {
370: case VDIR:
371: return (EISDIR);
372: case VLNK:
373: case VREG:
374: if (vp->v_mount->mnt_flag & MNT_RDONLY)
375: return (EROFS);
376: break;
377: default:
378: break;
379: }
380: if ((error = UFS_TRUNCATE(ip, vap->va_size, 0, cred)) != 0)
381: return (error);
382: if (vap->va_size < oldsize)
383: hint |= NOTE_TRUNCATE;
384: }
385: if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
386: if (vp->v_mount->mnt_flag & MNT_RDONLY)
387: return (EROFS);
388: if (cred->cr_uid != DIP(ip, uid) &&
389: (error = suser_ucred(cred)) &&
390: ((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
391: (error = VOP_ACCESS(vp, VWRITE, cred, p))))
392: return (error);
393: if (vap->va_atime.tv_sec != VNOVAL)
394: ip->i_flag |= IN_ACCESS;
395: if (vap->va_mtime.tv_sec != VNOVAL)
396: ip->i_flag |= IN_CHANGE | IN_UPDATE;
397: error = UFS_UPDATE2(ip, &vap->va_atime, &vap->va_mtime, 0);
398: if (error)
399: return (error);
400: }
401: error = 0;
402: if (vap->va_mode != (mode_t)VNOVAL) {
403: if (vp->v_mount->mnt_flag & MNT_RDONLY)
404: return (EROFS);
405: error = ufs_chmod(vp, (int)vap->va_mode, cred, p);
406: }
407: VN_KNOTE(vp, hint);
408: return (error);
409: }
410:
411: /*
412: * Change the mode on a file.
413: * Inode must be locked before calling.
414: */
415: static int
416: ufs_chmod(struct vnode *vp, int mode, struct ucred *cred, struct proc *p)
417: {
418: struct inode *ip = VTOI(vp);
419: int error;
420:
421: if (cred->cr_uid != DIP(ip, uid) &&
422: (error = suser_ucred(cred)))
423: return (error);
424: if (cred->cr_uid) {
425: if (vp->v_type != VDIR && (mode & S_ISTXT))
426: return (EFTYPE);
427: if (!groupmember(DIP(ip, gid), cred) && (mode & ISGID))
428: return (EPERM);
429: }
430: DIP(ip, mode) &= ~ALLPERMS;
431: DIP(ip, mode) |= (mode & ALLPERMS);
432: ip->i_flag |= IN_CHANGE;
433: if ((vp->v_flag & VTEXT) && (DIP(ip, mode) & S_ISTXT) == 0)
434: (void) uvm_vnp_uncache(vp);
435: return (0);
436: }
437:
438: /*
439: * Perform chown operation on inode ip;
440: * inode must be locked prior to call.
441: */
442: static int
443: ufs_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred,
444: struct proc *p)
445: {
446: struct inode *ip = VTOI(vp);
447: uid_t ouid;
448: gid_t ogid;
449: int error = 0;
450: daddr_t change;
451: enum ufs_quota_flags quota_flags = 0;
452:
453: if (uid == (uid_t)VNOVAL)
454: uid = DIP(ip, uid);
455: if (gid == (gid_t)VNOVAL)
456: gid = DIP(ip, gid);
457: /*
458: * If we don't own the file, are trying to change the owner
459: * of the file, or are not a member of the target group,
460: * the caller must be superuser or the call fails.
461: */
462: if ((cred->cr_uid != DIP(ip, uid) || uid != DIP(ip, uid) ||
463: (gid != DIP(ip, gid) && !groupmember((gid_t)gid, cred))) &&
464: (error = suser_ucred(cred)))
465: return (error);
466: ogid = DIP(ip, gid);
467: ouid = DIP(ip, uid);
468: change = DIP(ip, blocks);
469:
470: if (ouid == uid)
471: quota_flags |= UFS_QUOTA_NOUID;
472:
473: if (ogid == gid)
474: quota_flags |= UFS_QUOTA_NOGID;
475:
476: if ((error = getinoquota(ip)) != 0)
477: return (error);
478: (void) ufs_quota_free_blocks2(ip, change, cred, quota_flags);
479: (void) ufs_quota_free_inode2(ip, cred, quota_flags);
480: (void) ufs_quota_delete(ip);
481:
482: DIP_ASSIGN(ip, gid, gid);
483: DIP_ASSIGN(ip, uid, uid);
484:
485: if ((error = getinoquota(ip)) != 0)
486: goto error;
487:
488: if ((error = ufs_quota_alloc_blocks2(ip, change, cred,
489: quota_flags)) != 0)
490: goto error;
491:
492: if ((error = ufs_quota_alloc_inode2(ip, cred ,
493: quota_flags)) != 0) {
494: (void)ufs_quota_free_blocks2(ip, change, cred,
495: quota_flags);
496: goto error;
497: }
498:
499: if (getinoquota(ip))
500: panic("chown: lost quota");
501:
502: if (ouid != uid || ogid != gid)
503: ip->i_flag |= IN_CHANGE;
504: if (ouid != uid && cred->cr_uid != 0)
505: DIP(ip, mode) &= ~ISUID;
506: if (ogid != gid && cred->cr_uid != 0)
507: DIP(ip, mode) &= ~ISGID;
508: return (0);
509:
510: error:
511: (void) ufs_quota_delete(ip);
512:
513: DIP_ASSIGN(ip, gid, ogid);
514: DIP_ASSIGN(ip, uid, ouid);
515:
516: if (getinoquota(ip) == 0) {
517: (void) ufs_quota_alloc_blocks2(ip, change, cred,
518: quota_flags | UFS_QUOTA_FORCE);
519: (void) ufs_quota_alloc_inode2(ip, cred,
520: quota_flags | UFS_QUOTA_FORCE);
521: (void) getinoquota(ip);
522: }
523: return (error);
524:
525: }
526:
527: /* ARGSUSED */
528: int
529: ufs_ioctl(void *v)
530: {
531: #if 0
532: struct vop_ioctl_args *ap = v;
533: #endif
534: return (ENOTTY);
535: }
536:
537: /* ARGSUSED */
538: int
539: ufs_poll(void *v)
540: {
541: struct vop_poll_args *ap = v;
542:
543: /*
544: * We should really check to see if I/O is possible.
545: */
546: return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
547: }
548:
549: int
550: ufs_remove(void *v)
551: {
552: struct vop_remove_args *ap = v;
553: struct inode *ip;
554: struct vnode *vp = ap->a_vp;
555: struct vnode *dvp = ap->a_dvp;
556: int error;
557:
558: ip = VTOI(vp);
559: if (vp->v_type == VDIR || (DIP(ip, flags) & (IMMUTABLE | APPEND)) ||
560: (DIP(VTOI(dvp), flags) & APPEND)) {
561: error = EPERM;
562: goto out;
563: }
564: error = ufs_dirremove(dvp, ip, ap->a_cnp->cn_flags, 0);
565: VN_KNOTE(vp, NOTE_DELETE);
566: VN_KNOTE(dvp, NOTE_WRITE);
567: out:
568: if (dvp == vp)
569: vrele(vp);
570: else
571: vput(vp);
572: vput(dvp);
573: return (error);
574: }
575:
576: /*
577: * link vnode call
578: */
579: int
580: ufs_link(void *v)
581: {
582: struct vop_link_args *ap = v;
583: struct vnode *dvp = ap->a_dvp;
584: struct vnode *vp = ap->a_vp;
585: struct componentname *cnp = ap->a_cnp;
586: struct proc *p = cnp->cn_proc;
587: struct inode *ip;
588: struct direct newdir;
589: int error;
590:
591: #ifdef DIAGNOSTIC
592: if ((cnp->cn_flags & HASBUF) == 0)
593: panic("ufs_link: no name");
594: #endif
595: if (vp->v_type == VDIR) {
596: VOP_ABORTOP(dvp, cnp);
597: error = EPERM;
598: goto out2;
599: }
600: if (dvp->v_mount != vp->v_mount) {
601: VOP_ABORTOP(dvp, cnp);
602: error = EXDEV;
603: goto out2;
604: }
605: if (dvp != vp && (error = vn_lock(vp, LK_EXCLUSIVE, p))) {
606: VOP_ABORTOP(dvp, cnp);
607: goto out2;
608: }
609: ip = VTOI(vp);
610: if ((nlink_t) DIP(ip, nlink) >= LINK_MAX) {
611: VOP_ABORTOP(dvp, cnp);
612: error = EMLINK;
613: goto out1;
614: }
615: if (DIP(ip, flags) & (IMMUTABLE | APPEND)) {
616: VOP_ABORTOP(dvp, cnp);
617: error = EPERM;
618: goto out1;
619: }
620: ip->i_effnlink++;
621: DIP_ADD(ip, nlink, 1);
622: ip->i_flag |= IN_CHANGE;
623: if (DOINGSOFTDEP(vp))
624: softdep_change_linkcnt(ip, 0);
625: if ((error = UFS_UPDATE(ip, !DOINGSOFTDEP(vp))) == 0) {
626: ufs_makedirentry(ip, cnp, &newdir);
627: error = ufs_direnter(dvp, vp, &newdir, cnp, NULL);
628: }
629: if (error) {
630: ip->i_effnlink--;
631: DIP_ADD(ip, nlink, -1);
632: ip->i_flag |= IN_CHANGE;
633: if (DOINGSOFTDEP(vp))
634: softdep_change_linkcnt(ip, 0);
635: }
636: pool_put(&namei_pool, cnp->cn_pnbuf);
637: VN_KNOTE(vp, NOTE_LINK);
638: VN_KNOTE(dvp, NOTE_WRITE);
639: out1:
640: if (dvp != vp)
641: VOP_UNLOCK(vp, 0, p);
642: out2:
643: vput(dvp);
644: return (error);
645: }
646:
647: /*
648: * Rename system call.
649: * rename("foo", "bar");
650: * is essentially
651: * unlink("bar");
652: * link("foo", "bar");
653: * unlink("foo");
654: * but ``atomically''. Can't do full commit without saving state in the
655: * inode on disk which isn't feasible at this time. Best we can do is
656: * always guarantee the target exists.
657: *
658: * Basic algorithm is:
659: *
660: * 1) Bump link count on source while we're linking it to the
661: * target. This also ensure the inode won't be deleted out
662: * from underneath us while we work (it may be truncated by
663: * a concurrent `trunc' or `open' for creation).
664: * 2) Link source to destination. If destination already exists,
665: * delete it first.
666: * 3) Unlink source reference to inode if still around. If a
667: * directory was moved and the parent of the destination
668: * is different from the source, patch the ".." entry in the
669: * directory.
670: */
671: int
672: ufs_rename(void *v)
673: {
674: struct vop_rename_args *ap = v;
675: struct vnode *tvp = ap->a_tvp;
676: struct vnode *tdvp = ap->a_tdvp;
677: struct vnode *fvp = ap->a_fvp;
678: struct vnode *fdvp = ap->a_fdvp;
679: struct componentname *tcnp = ap->a_tcnp;
680: struct componentname *fcnp = ap->a_fcnp;
681: struct proc *p = fcnp->cn_proc;
682: struct inode *ip, *xp, *dp;
683: struct direct newdir;
684: int doingdirectory = 0, oldparent = 0, newparent = 0;
685: int error = 0;
686:
687: #ifdef DIAGNOSTIC
688: if ((tcnp->cn_flags & HASBUF) == 0 ||
689: (fcnp->cn_flags & HASBUF) == 0)
690: panic("ufs_rename: no name");
691: #endif
692: /*
693: * Check for cross-device rename.
694: */
695: if ((fvp->v_mount != tdvp->v_mount) ||
696: (tvp && (fvp->v_mount != tvp->v_mount))) {
697: error = EXDEV;
698: abortit:
699: VOP_ABORTOP(tdvp, tcnp);
700: if (tdvp == tvp)
701: vrele(tdvp);
702: else
703: vput(tdvp);
704: if (tvp)
705: vput(tvp);
706: VOP_ABORTOP(fdvp, fcnp);
707: vrele(fdvp);
708: vrele(fvp);
709: return (error);
710: }
711:
712: if (tvp && ((DIP(VTOI(tvp), flags) & (IMMUTABLE | APPEND)) ||
713: (DIP(VTOI(tdvp), flags) & APPEND))) {
714: error = EPERM;
715: goto abortit;
716: }
717:
718: /*
719: * Check if just deleting a link name or if we've lost a race.
720: * If another process completes the same rename after we've looked
721: * up the source and have blocked looking up the target, then the
722: * source and target inodes may be identical now although the
723: * names were never linked.
724: */
725: if (fvp == tvp) {
726: if (fvp->v_type == VDIR) {
727: /*
728: * Linked directories are impossible, so we must
729: * have lost the race. Pretend that the rename
730: * completed before the lookup.
731: */
732: error = ENOENT;
733: goto abortit;
734: }
735:
736: /* Release destination completely. */
737: VOP_ABORTOP(tdvp, tcnp);
738: vput(tdvp);
739: vput(tvp);
740:
741: /*
742: * Delete source. There is another race now that everything
743: * is unlocked, but this doesn't cause any new complications.
744: * relookup() may find a file that is unrelated to the
745: * original one, or it may fail. Too bad.
746: */
747: vrele(fvp);
748: fcnp->cn_flags &= ~MODMASK;
749: fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
750: if ((fcnp->cn_flags & SAVESTART) == 0)
751: panic("ufs_rename: lost from startdir");
752: fcnp->cn_nameiop = DELETE;
753: if ((error = relookup(fdvp, &fvp, fcnp)) != 0)
754: return (error); /* relookup did vrele() */
755: vrele(fdvp);
756: return (VOP_REMOVE(fdvp, fvp, fcnp));
757: }
758:
759: if ((error = vn_lock(fvp, LK_EXCLUSIVE, p)) != 0)
760: goto abortit;
761:
762: /* fvp, tdvp, tvp now locked */
763: dp = VTOI(fdvp);
764: ip = VTOI(fvp);
765: if ((nlink_t) DIP(ip, nlink) >= LINK_MAX) {
766: VOP_UNLOCK(fvp, 0, p);
767: error = EMLINK;
768: goto abortit;
769: }
770: if ((DIP(ip, flags) & (IMMUTABLE | APPEND)) ||
771: (DIP(dp, flags) & APPEND)) {
772: VOP_UNLOCK(fvp, 0, p);
773: error = EPERM;
774: goto abortit;
775: }
776: if ((DIP(ip, mode) & IFMT) == IFDIR) {
777: error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_proc);
778: if (!error && tvp)
779: error = VOP_ACCESS(tvp, VWRITE, tcnp->cn_cred, tcnp->cn_proc);
780: if (error) {
781: VOP_UNLOCK(fvp, 0, p);
782: error = EACCES;
783: goto abortit;
784: }
785: /*
786: * Avoid ".", "..", and aliases of "." for obvious reasons.
787: */
788: if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
789: dp == ip ||
790: (fcnp->cn_flags & ISDOTDOT) ||
791: (tcnp->cn_flags & ISDOTDOT) ||
792: (ip->i_flag & IN_RENAME)) {
793: VOP_UNLOCK(fvp, 0, p);
794: error = EINVAL;
795: goto abortit;
796: }
797: ip->i_flag |= IN_RENAME;
798: oldparent = dp->i_number;
799: doingdirectory = 1;
800: }
801: VN_KNOTE(fdvp, NOTE_WRITE); /* XXX right place? */
802:
803: /*
804: * When the target exists, both the directory
805: * and target vnodes are returned locked.
806: */
807: dp = VTOI(tdvp);
808: xp = NULL;
809: if (tvp)
810: xp = VTOI(tvp);
811:
812: /*
813: * 1) Bump link count while we're moving stuff
814: * around. If we crash somewhere before
815: * completing our work, the link count
816: * may be wrong, but correctable.
817: */
818: ip->i_effnlink++;
819: DIP_ADD(ip, nlink, 1);
820: ip->i_flag |= IN_CHANGE;
821: if (DOINGSOFTDEP(fvp))
822: softdep_change_linkcnt(ip, 0);
823: if ((error = UFS_UPDATE(ip, !DOINGSOFTDEP(fvp))) != 0) {
824: VOP_UNLOCK(fvp, 0, p);
825: goto bad;
826: }
827:
828: /*
829: * If ".." must be changed (ie the directory gets a new
830: * parent) then the source directory must not be in the
831: * directory hierarchy above the target, as this would
832: * orphan everything below the source directory. Also
833: * the user must have write permission in the source so
834: * as to be able to change "..". We must repeat the call
835: * to namei, as the parent directory is unlocked by the
836: * call to checkpath().
837: */
838: error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_proc);
839: VOP_UNLOCK(fvp, 0, p);
840:
841: /* tdvp and tvp locked */
842: if (oldparent != dp->i_number)
843: newparent = dp->i_number;
844: if (doingdirectory && newparent) {
845: if (error) /* write access check above */
846: goto bad;
847: if (xp != NULL)
848: vput(tvp);
849: /*
850: * Compensate for the reference ufs_checkpath() loses.
851: */
852: vref(tdvp);
853: /* Only tdvp is locked */
854: if ((error = ufs_checkpath(ip, dp, tcnp->cn_cred)) != 0) {
855: vrele(tdvp);
856: goto out;
857: }
858: if ((tcnp->cn_flags & SAVESTART) == 0)
859: panic("ufs_rename: lost to startdir");
860: if ((error = relookup(tdvp, &tvp, tcnp)) != 0)
861: goto out;
862: vrele(tdvp); /* relookup() acquired a reference */
863: dp = VTOI(tdvp);
864: xp = NULL;
865: if (tvp)
866: xp = VTOI(tvp);
867: }
868: /*
869: * 2) If target doesn't exist, link the target
870: * to the source and unlink the source.
871: * Otherwise, rewrite the target directory
872: * entry to reference the source inode and
873: * expunge the original entry's existence.
874: */
875: if (xp == NULL) {
876: if (dp->i_dev != ip->i_dev)
877: panic("rename: EXDEV");
878: /*
879: * Account for ".." in new directory.
880: * When source and destination have the same
881: * parent we don't fool with the link count.
882: */
883: if (doingdirectory && newparent) {
884: if ((nlink_t) DIP(dp, nlink) >= LINK_MAX) {
885: error = EMLINK;
886: goto bad;
887: }
888: dp->i_effnlink++;
889: DIP_ADD(dp, nlink, 1);
890: dp->i_flag |= IN_CHANGE;
891: if (DOINGSOFTDEP(tdvp))
892: softdep_change_linkcnt(dp, 0);
893: if ((error = UFS_UPDATE(dp, !DOINGSOFTDEP(tdvp)))
894: != 0) {
895: dp->i_effnlink--;
896: DIP_ADD(dp, nlink, -1);
897: dp->i_flag |= IN_CHANGE;
898: if (DOINGSOFTDEP(tdvp))
899: softdep_change_linkcnt(dp, 0);
900: goto bad;
901: }
902: }
903: ufs_makedirentry(ip, tcnp, &newdir);
904: if ((error = ufs_direnter(tdvp, NULL, &newdir, tcnp, NULL)) != 0) {
905: if (doingdirectory && newparent) {
906: dp->i_effnlink--;
907: DIP_ADD(dp, nlink, -1);
908: dp->i_flag |= IN_CHANGE;
909: if (DOINGSOFTDEP(tdvp))
910: softdep_change_linkcnt(dp, 0);
911: (void)UFS_UPDATE(dp, 1);
912: }
913: goto bad;
914: }
915: VN_KNOTE(tdvp, NOTE_WRITE);
916: vput(tdvp);
917: } else {
918: if (xp->i_dev != dp->i_dev || xp->i_dev != ip->i_dev)
919: panic("rename: EXDEV");
920: /*
921: * Short circuit rename(foo, foo).
922: */
923: if (xp->i_number == ip->i_number)
924: panic("ufs_rename: same file");
925: /*
926: * If the parent directory is "sticky", then the user must
927: * own the parent directory, or the destination of the rename,
928: * otherwise the destination may not be changed (except by
929: * root). This implements append-only directories.
930: */
931: if ((DIP(dp, mode) & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 &&
932: tcnp->cn_cred->cr_uid != DIP(dp, uid) &&
933: DIP(xp, uid )!= tcnp->cn_cred->cr_uid) {
934: error = EPERM;
935: goto bad;
936: }
937: /*
938: * Target must be empty if a directory and have no links
939: * to it. Also, ensure source and target are compatible
940: * (both directories, or both not directories).
941: */
942: if ((DIP(xp, mode) & IFMT) == IFDIR) {
943: if (xp->i_effnlink > 2 ||
944: !ufs_dirempty(xp, dp->i_number, tcnp->cn_cred)) {
945: error = ENOTEMPTY;
946: goto bad;
947: }
948: if (!doingdirectory) {
949: error = ENOTDIR;
950: goto bad;
951: }
952: cache_purge(tdvp);
953: } else if (doingdirectory) {
954: error = EISDIR;
955: goto bad;
956: }
957:
958: if ((error = ufs_dirrewrite(dp, xp, ip->i_number,
959: IFTODT(DIP(ip, mode)), (doingdirectory && newparent) ?
960: newparent : doingdirectory)) != 0)
961: goto bad;
962: if (doingdirectory) {
963: if (!newparent) {
964: dp->i_effnlink--;
965: if (DOINGSOFTDEP(tdvp))
966: softdep_change_linkcnt(dp, 0);
967: }
968: xp->i_effnlink--;
969: if (DOINGSOFTDEP(tvp))
970: softdep_change_linkcnt(xp, 0);
971: }
972: if (doingdirectory && !DOINGSOFTDEP(tvp)) {
973: /*
974: * Truncate inode. The only stuff left in the directory
975: * is "." and "..". The "." reference is inconsequential
976: * since we are quashing it. We have removed the "."
977: * reference and the reference in the parent directory,
978: * but there may be other hard links. The soft
979: * dependency code will arrange to do these operations
980: * after the parent directory entry has been deleted on
981: * disk, so when running with that code we avoid doing
982: * them now.
983: */
984: if (!newparent) {
985: DIP_ADD(dp, nlink, -1);
986: dp->i_flag |= IN_CHANGE;
987: }
988:
989: DIP_ADD(xp, nlink, -1);
990: xp->i_flag |= IN_CHANGE;
991: if ((error = UFS_TRUNCATE(VTOI(tvp), (off_t)0, IO_SYNC,
992: tcnp->cn_cred)) != 0)
993: goto bad;
994: }
995: VN_KNOTE(tdvp, NOTE_WRITE);
996: vput(tdvp);
997: VN_KNOTE(tvp, NOTE_DELETE);
998: vput(tvp);
999: xp = NULL;
1000: }
1001:
1002: /*
1003: * 3) Unlink the source.
1004: */
1005: fcnp->cn_flags &= ~MODMASK;
1006: fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
1007: if ((fcnp->cn_flags & SAVESTART) == 0)
1008: panic("ufs_rename: lost from startdir");
1009: if ((error = relookup(fdvp, &fvp, fcnp)) != 0) {
1010: vrele(ap->a_fvp);
1011: return (error);
1012: }
1013: vrele(fdvp);
1014: if (fvp == NULL) {
1015: /*
1016: * From name has disappeared.
1017: */
1018: if (doingdirectory)
1019: panic("ufs_rename: lost dir entry");
1020: vrele(ap->a_fvp);
1021: return (0);
1022: }
1023:
1024: xp = VTOI(fvp);
1025: dp = VTOI(fdvp);
1026:
1027: /*
1028: * Ensure that the directory entry still exists and has not
1029: * changed while the new name has been entered. If the source is
1030: * a file then the entry may have been unlinked or renamed. In
1031: * either case there is no further work to be done. If the source
1032: * is a directory then it cannot have been rmdir'ed; the IN_RENAME
1033: * flag ensures that it cannot be moved by another rename or removed
1034: * by a rmdir.
1035: */
1036: if (xp != ip) {
1037: if (doingdirectory)
1038: panic("ufs_rename: lost dir entry");
1039: } else {
1040: /*
1041: * If the source is a directory with a
1042: * new parent, the link count of the old
1043: * parent directory must be decremented
1044: * and ".." set to point to the new parent.
1045: */
1046: if (doingdirectory && newparent) {
1047: xp->i_offset = mastertemplate.dot_reclen;
1048: ufs_dirrewrite(xp, dp, newparent, DT_DIR, 0);
1049: cache_purge(fdvp);
1050: }
1051: error = ufs_dirremove(fdvp, xp, fcnp->cn_flags, 0);
1052: xp->i_flag &= ~IN_RENAME;
1053: }
1054: VN_KNOTE(fvp, NOTE_RENAME);
1055: if (dp)
1056: vput(fdvp);
1057: if (xp)
1058: vput(fvp);
1059: vrele(ap->a_fvp);
1060: return (error);
1061:
1062: bad:
1063: if (xp)
1064: vput(ITOV(xp));
1065: vput(ITOV(dp));
1066: out:
1067: vrele(fdvp);
1068: if (doingdirectory)
1069: ip->i_flag &= ~IN_RENAME;
1070: if (vn_lock(fvp, LK_EXCLUSIVE, p) == 0) {
1071: ip->i_effnlink--;
1072: DIP_ADD(ip, nlink, -1);
1073: ip->i_flag |= IN_CHANGE;
1074: ip->i_flag &= ~IN_RENAME;
1075: if (DOINGSOFTDEP(fvp))
1076: softdep_change_linkcnt(ip, 0);
1077: vput(fvp);
1078: } else
1079: vrele(fvp);
1080: return (error);
1081: }
1082:
1083: /*
1084: * Mkdir system call
1085: */
1086: int
1087: ufs_mkdir(void *v)
1088: {
1089: struct vop_mkdir_args *ap = v;
1090: struct vnode *dvp = ap->a_dvp;
1091: struct vattr *vap = ap->a_vap;
1092: struct componentname *cnp = ap->a_cnp;
1093: struct inode *ip, *dp;
1094: struct vnode *tvp;
1095: struct buf *bp;
1096: struct direct newdir;
1097: struct dirtemplate dirtemplate, *dtp;
1098: int error, dmode, blkoff;
1099:
1100: #ifdef DIAGNOSTIC
1101: if ((cnp->cn_flags & HASBUF) == 0)
1102: panic("ufs_mkdir: no name");
1103: #endif
1104: dp = VTOI(dvp);
1105: if ((nlink_t) DIP(dp, nlink) >= LINK_MAX) {
1106: error = EMLINK;
1107: goto out;
1108: }
1109: dmode = vap->va_mode & 0777;
1110: dmode |= IFDIR;
1111: /*
1112: * Must simulate part of ufs_makeinode here to acquire the inode,
1113: * but not have it entered in the parent directory. The entry is
1114: * made later after writing "." and ".." entries.
1115: */
1116: if ((error = UFS_INODE_ALLOC(dp, dmode, cnp->cn_cred, &tvp)) != 0)
1117: goto out;
1118:
1119: ip = VTOI(tvp);
1120:
1121: DIP_ASSIGN(ip, uid, cnp->cn_cred->cr_uid);
1122: DIP_ASSIGN(ip, gid, DIP(dp, gid));
1123:
1124: if ((error = getinoquota(ip)) ||
1125: (error = ufs_quota_alloc_inode(ip, cnp->cn_cred))) {
1126: pool_put(&namei_pool, cnp->cn_pnbuf);
1127: UFS_INODE_FREE(ip, ip->i_number, dmode);
1128: vput(tvp);
1129: vput(dvp);
1130: return (error);
1131: }
1132:
1133: ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
1134: DIP_ASSIGN(ip, mode, dmode);
1135: tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */
1136: ip->i_effnlink = 2;
1137: DIP_ASSIGN(ip, nlink, 2);
1138: if (DOINGSOFTDEP(tvp))
1139: softdep_change_linkcnt(ip, 0);
1140:
1141: /*
1142: * Bump link count in parent directory to reflect work done below.
1143: * Should be done before reference is create so cleanup is
1144: * possible if we crash.
1145: */
1146: dp->i_effnlink++;
1147: DIP_ADD(dp, nlink, 1);
1148: dp->i_flag |= IN_CHANGE;
1149: if (DOINGSOFTDEP(dvp))
1150: softdep_change_linkcnt(dp, 0);
1151: if ((error = UFS_UPDATE(dp, !DOINGSOFTDEP(dvp))) != 0)
1152: goto bad;
1153:
1154: /*
1155: * Initialize directory with "." and ".." from static template.
1156: */
1157: if (dvp->v_mount->mnt_maxsymlinklen > 0)
1158: dtp = &mastertemplate;
1159: else
1160: dtp = (struct dirtemplate *)&omastertemplate;
1161: dirtemplate = *dtp;
1162: dirtemplate.dot_ino = ip->i_number;
1163: dirtemplate.dotdot_ino = dp->i_number;
1164:
1165: if ((error = UFS_BUF_ALLOC(ip, (off_t)0, DIRBLKSIZ, cnp->cn_cred,
1166: B_CLRBUF, &bp)) != 0)
1167: goto bad;
1168: DIP_ASSIGN(ip, size, DIRBLKSIZ);
1169: ip->i_flag |= IN_CHANGE | IN_UPDATE;
1170: uvm_vnp_setsize(tvp, DIP(ip, size));
1171: bcopy((caddr_t)&dirtemplate, (caddr_t)bp->b_data, sizeof dirtemplate);
1172: if (DOINGSOFTDEP(tvp)) {
1173: /*
1174: * Ensure that the entire newly allocated block is a
1175: * valid directory so that future growth within the
1176: * block does not have to ensure that the block is
1177: * written before the inode
1178: */
1179: blkoff = DIRBLKSIZ;
1180: while (blkoff < bp->b_bcount) {
1181: ((struct direct *)
1182: (bp->b_data + blkoff))->d_reclen = DIRBLKSIZ;
1183: blkoff += DIRBLKSIZ;
1184: }
1185: }
1186: if ((error = UFS_UPDATE(ip, !DOINGSOFTDEP(tvp))) != 0) {
1187: (void)VOP_BWRITE(bp);
1188: goto bad;
1189: }
1190:
1191: /*
1192: * Directory set up, now install its entry in the parent directory.
1193: *
1194: * If we are not doing soft dependencies, then we must write out the
1195: * buffer containing the new directory body before entering the new
1196: * name in the parent. If we are doing soft dependencies, then the
1197: * buffer containing the new directory body will be passed to and
1198: * released in the soft dependency code after the code has attached
1199: * an appropriate ordering dependency to the buffer which ensures that
1200: * the buffer is written before the new name is written in the parent.
1201: */
1202: if (!DOINGSOFTDEP(dvp) && ((error = VOP_BWRITE(bp)) != 0))
1203: goto bad;
1204: ufs_makedirentry(ip, cnp, &newdir);
1205: error = ufs_direnter(dvp, tvp, &newdir, cnp, bp);
1206:
1207: bad:
1208: if (error == 0) {
1209: VN_KNOTE(dvp, NOTE_WRITE);
1210: *ap->a_vpp = tvp;
1211: } else {
1212: dp->i_effnlink--;
1213: DIP_ADD(dp, nlink, -1);
1214: dp->i_flag |= IN_CHANGE;
1215: if (DOINGSOFTDEP(dvp))
1216: softdep_change_linkcnt(dp, 0);
1217: /*
1218: * No need to do an explicit VOP_TRUNCATE here, vrele will
1219: * do this for us because we set the link count to 0.
1220: */
1221: ip->i_effnlink = 0;
1222: DIP_ASSIGN(ip, nlink, 0);
1223: ip->i_flag |= IN_CHANGE;
1224: if (DOINGSOFTDEP(tvp))
1225: softdep_change_linkcnt(ip, 0);
1226: vput(tvp);
1227: }
1228: out:
1229: pool_put(&namei_pool, cnp->cn_pnbuf);
1230: vput(dvp);
1231:
1232: return (error);
1233: }
1234:
1235: /*
1236: * Rmdir system call.
1237: */
1238: int
1239: ufs_rmdir(void *v)
1240: {
1241: struct vop_rmdir_args *ap = v;
1242: struct vnode *vp = ap->a_vp;
1243: struct vnode *dvp = ap->a_dvp;
1244: struct componentname *cnp = ap->a_cnp;
1245: struct inode *ip, *dp;
1246: int error;
1247:
1248: ip = VTOI(vp);
1249: dp = VTOI(dvp);
1250: /*
1251: * No rmdir "." or of mounted on directories.
1252: */
1253: if (dp == ip || vp->v_mountedhere != 0) {
1254: if (dp == ip)
1255: vrele(dvp);
1256: else
1257: vput(dvp);
1258: vput(vp);
1259: return (EINVAL);
1260: }
1261: /*
1262: * Do not remove a directory that is in the process of being renamed.
1263: * Verify the directory is empty (and valid). Rmdir ".." will not be
1264: * valid since ".." will contain a reference to the current directory
1265: * and thus be non-empty.
1266: */
1267: error = 0;
1268: if (ip->i_flag & IN_RENAME) {
1269: error = EINVAL;
1270: goto out;
1271: }
1272: if (ip->i_effnlink != 2 ||
1273: !ufs_dirempty(ip, dp->i_number, cnp->cn_cred)) {
1274: error = ENOTEMPTY;
1275: goto out;
1276: }
1277: if ((DIP(dp, flags) & APPEND) ||
1278: (DIP(ip, flags) & (IMMUTABLE | APPEND))) {
1279: error = EPERM;
1280: goto out;
1281: }
1282: /*
1283: * Delete reference to directory before purging
1284: * inode. If we crash in between, the directory
1285: * will be reattached to lost+found,
1286: */
1287: dp->i_effnlink--;
1288: ip->i_effnlink--;
1289: if (DOINGSOFTDEP(vp)) {
1290: softdep_change_linkcnt(dp, 0);
1291: softdep_change_linkcnt(ip, 0);
1292: }
1293: if ((error = ufs_dirremove(dvp, ip, cnp->cn_flags, 1)) != 0) {
1294: dp->i_effnlink++;
1295: ip->i_effnlink++;
1296: if (DOINGSOFTDEP(vp)) {
1297: softdep_change_linkcnt(dp, 0);
1298: softdep_change_linkcnt(ip, 0);
1299: }
1300: goto out;
1301: }
1302:
1303: VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK);
1304: cache_purge(dvp);
1305: /*
1306: * Truncate inode. The only stuff left in the directory is "." and
1307: * "..". The "." reference is inconsequential since we are quashing
1308: * it. The soft dependency code will arrange to do these operations
1309: * after the parent directory entry has been deleted on disk, so
1310: * when running with that code we avoid doing them now.
1311: */
1312: if (!DOINGSOFTDEP(vp)) {
1313: int ioflag;
1314:
1315: DIP_ADD(dp, nlink, -1);
1316: dp->i_flag |= IN_CHANGE;
1317: DIP_ADD(ip, nlink, -1);
1318: ip->i_flag |= IN_CHANGE;
1319: ioflag = DOINGASYNC(vp) ? 0 : IO_SYNC;
1320: error = UFS_TRUNCATE(ip, (off_t)0, ioflag, cnp->cn_cred);
1321: }
1322: cache_purge(vp);
1323: #ifdef UFS_DIRHASH
1324: /* Kill any active hash; i_effnlink == 0, so it will not come back. */
1325: if (ip->i_dirhash != NULL)
1326: ufsdirhash_free(ip);
1327: #endif
1328:
1329: out:
1330: VN_KNOTE(vp, NOTE_DELETE);
1331: vput(dvp);
1332: vput(vp);
1333: return (error);
1334: }
1335:
1336: /*
1337: * symlink -- make a symbolic link
1338: */
1339: int
1340: ufs_symlink(void *v)
1341: {
1342: struct vop_symlink_args *ap = v;
1343: struct vnode *vp, **vpp = ap->a_vpp;
1344: struct inode *ip;
1345: int len, error;
1346:
1347: error = ufs_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp,
1348: vpp, ap->a_cnp);
1349: if (error)
1350: return (error);
1351: VN_KNOTE(ap->a_dvp, NOTE_WRITE);
1352: vp = *vpp;
1353: len = strlen(ap->a_target);
1354: if (len < vp->v_mount->mnt_maxsymlinklen) {
1355: ip = VTOI(vp);
1356: bcopy(ap->a_target, (char *)SHORTLINK(ip), len);
1357: DIP_ASSIGN(ip, size, len);
1358: ip->i_flag |= IN_CHANGE | IN_UPDATE;
1359: } else
1360: error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0,
1361: UIO_SYSSPACE, IO_NODELOCKED, ap->a_cnp->cn_cred, NULL,
1362: (struct proc *)0);
1363: vput(vp);
1364: return (error);
1365: }
1366:
1367: /*
1368: * Vnode op for reading directories.
1369: *
1370: * The routine below assumes that the on-disk format of a directory
1371: * is the same as that defined by <sys/dirent.h>. If the on-disk
1372: * format changes, then it will be necessary to do a conversion
1373: * from the on-disk format that read returns to the format defined
1374: * by <sys/dirent.h>.
1375: */
1376: int
1377: ufs_readdir(void *v)
1378: {
1379: struct vop_readdir_args *ap = v;
1380: struct uio *uio = ap->a_uio;
1381: int error;
1382: size_t count, lost, entries;
1383: off_t off = uio->uio_offset;
1384:
1385: count = uio->uio_resid;
1386: entries = (uio->uio_offset + count) & (DIRBLKSIZ - 1);
1387:
1388: /* Make sure we don't return partial entries. */
1389: if (count <= entries)
1390: return (EINVAL);
1391:
1392: count -= entries;
1393: lost = uio->uio_resid - count;
1394: uio->uio_resid = count;
1395: uio->uio_iov->iov_len = count;
1396: # if (BYTE_ORDER == LITTLE_ENDIAN)
1397: if (ap->a_vp->v_mount->mnt_maxsymlinklen > 0) {
1398: error = VOP_READ(ap->a_vp, uio, 0, ap->a_cred);
1399: } else {
1400: struct dirent *dp, *edp;
1401: struct uio auio;
1402: struct iovec aiov;
1403: caddr_t dirbuf;
1404: int readcnt;
1405: u_char tmp;
1406:
1407: auio = *uio;
1408: auio.uio_iov = &aiov;
1409: auio.uio_iovcnt = 1;
1410: auio.uio_segflg = UIO_SYSSPACE;
1411: aiov.iov_len = count;
1412: MALLOC(dirbuf, caddr_t, count, M_TEMP, M_WAITOK);
1413: aiov.iov_base = dirbuf;
1414: error = VOP_READ(ap->a_vp, &auio, 0, ap->a_cred);
1415: if (error == 0) {
1416: readcnt = count - auio.uio_resid;
1417: edp = (struct dirent *)&dirbuf[readcnt];
1418: for (dp = (struct dirent *)dirbuf; dp < edp; ) {
1419: tmp = dp->d_namlen;
1420: dp->d_namlen = dp->d_type;
1421: dp->d_type = tmp;
1422: if (dp->d_reclen > 0) {
1423: dp = (struct dirent *)
1424: ((char *)dp + dp->d_reclen);
1425: } else {
1426: error = EIO;
1427: break;
1428: }
1429: }
1430: if (dp >= edp)
1431: error = uiomove(dirbuf, readcnt, uio);
1432: }
1433: FREE(dirbuf, M_TEMP);
1434: }
1435: # else
1436: error = VOP_READ(ap->a_vp, uio, 0, ap->a_cred);
1437: # endif
1438: if (!error && ap->a_ncookies) {
1439: struct dirent *dp, *dpstart;
1440: off_t offstart;
1441: u_long *cookies;
1442: int ncookies;
1443:
1444: /*
1445: * Only the NFS server and emulations use cookies, and they
1446: * load the directory block into system space, so we can
1447: * just look at it directly.
1448: */
1449: if (uio->uio_segflg != UIO_SYSSPACE || uio->uio_iovcnt != 1)
1450: panic("ufs_readdir: lost in space");
1451:
1452: dpstart = (struct dirent *)
1453: ((char *)uio->uio_iov->iov_base -
1454: (uio->uio_offset - off));
1455: offstart = off;
1456: for (dp = dpstart, ncookies = 0; off < uio->uio_offset; ) {
1457: if (dp->d_reclen == 0)
1458: break;
1459: off += dp->d_reclen;
1460: ncookies++;
1461: dp = (struct dirent *)((caddr_t)dp + dp->d_reclen);
1462: }
1463: lost += uio->uio_offset - off;
1464: uio->uio_offset = off;
1465: MALLOC(cookies, u_long *, ncookies * sizeof(u_long), M_TEMP,
1466: M_WAITOK);
1467: *ap->a_ncookies = ncookies;
1468: *ap->a_cookies = cookies;
1469: for (off = offstart, dp = dpstart; off < uio->uio_offset; ) {
1470: off += dp->d_reclen;
1471: *cookies = off;
1472: cookies++;
1473: dp = (struct dirent *)((caddr_t)dp + dp->d_reclen);
1474: }
1475: }
1476:
1477: uio->uio_resid += lost;
1478: *ap->a_eofflag = DIP(VTOI(ap->a_vp), size) <= uio->uio_offset;
1479:
1480: return (error);
1481: }
1482:
1483: /*
1484: * Return target name of a symbolic link
1485: */
1486: int
1487: ufs_readlink(void *v)
1488: {
1489: struct vop_readlink_args *ap = v;
1490: struct vnode *vp = ap->a_vp;
1491: struct inode *ip = VTOI(vp);
1492: int isize;
1493:
1494: isize = DIP(ip, size);
1495: if (isize < vp->v_mount->mnt_maxsymlinklen ||
1496: (vp->v_mount->mnt_maxsymlinklen == 0 && DIP(ip, blocks) == 0)) {
1497: uiomove((char *)SHORTLINK(ip), isize, ap->a_uio);
1498: return (0);
1499: }
1500: return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred));
1501: }
1502:
1503: /*
1504: * Lock an inode. If its already locked, set the WANT bit and sleep.
1505: */
1506: int
1507: ufs_lock(void *v)
1508: {
1509: struct vop_lock_args *ap = v;
1510: struct vnode *vp = ap->a_vp;
1511:
1512: return (lockmgr(&VTOI(vp)->i_lock, ap->a_flags, NULL));
1513: }
1514:
1515: /*
1516: * Unlock an inode. If WANT bit is on, wakeup.
1517: */
1518: int
1519: ufs_unlock(void *v)
1520: {
1521: struct vop_unlock_args *ap = v;
1522: struct vnode *vp = ap->a_vp;
1523:
1524: return (lockmgr(&VTOI(vp)->i_lock, ap->a_flags | LK_RELEASE, NULL));
1525: }
1526:
1527: /*
1528: * Check for a locked inode.
1529: */
1530: int
1531: ufs_islocked(void *v)
1532: {
1533: struct vop_islocked_args *ap = v;
1534:
1535: return (lockstatus(&VTOI(ap->a_vp)->i_lock));
1536: }
1537:
1538: /*
1539: * Calculate the logical to physical mapping if not done already,
1540: * then call the device strategy routine.
1541: */
1542: int
1543: ufs_strategy(void *v)
1544: {
1545: struct vop_strategy_args *ap = v;
1546: struct buf *bp = ap->a_bp;
1547: struct vnode *vp = bp->b_vp;
1548: struct inode *ip;
1549: int error;
1550: int s;
1551:
1552: ip = VTOI(vp);
1553: if (vp->v_type == VBLK || vp->v_type == VCHR)
1554: panic("ufs_strategy: spec");
1555: if (bp->b_blkno == bp->b_lblkno) {
1556: error = VOP_BMAP(vp, bp->b_lblkno, NULL, &bp->b_blkno,
1557: NULL);
1558: if (error) {
1559: bp->b_error = error;
1560: bp->b_flags |= B_ERROR;
1561: s = splbio();
1562: biodone(bp);
1563: splx(s);
1564: return (error);
1565: }
1566: if ((long)bp->b_blkno == -1)
1567: clrbuf(bp);
1568: }
1569: if ((long)bp->b_blkno == -1) {
1570: s = splbio();
1571: biodone(bp);
1572: splx(s);
1573: return (0);
1574: }
1575: vp = ip->i_devvp;
1576: bp->b_dev = vp->v_rdev;
1577: VOCALL (vp->v_op, VOFFSET(vop_strategy), ap);
1578: return (0);
1579: }
1580:
1581: /*
1582: * Print out the contents of an inode.
1583: */
1584: int
1585: ufs_print(void *v)
1586: {
1587: #ifdef DIAGNOSTIC
1588: struct vop_print_args *ap = v;
1589:
1590: struct vnode *vp = ap->a_vp;
1591: struct inode *ip = VTOI(vp);
1592:
1593: printf("tag VT_UFS, ino %d, on dev %d, %d", ip->i_number,
1594: major(ip->i_dev), minor(ip->i_dev));
1595: printf(" flags 0x%x, effnlink %d, nlink %d\n",
1596: ip->i_flag, ip->i_effnlink, DIP(ip, nlink));
1597: printf("\tmode 0%o, owner %d, group %d, size %lld",
1598: DIP(ip, mode), DIP(ip, uid), DIP(ip, gid), DIP(ip, size));
1599:
1600: #ifdef FIFO
1601: if (vp->v_type == VFIFO)
1602: fifo_printinfo(vp);
1603: #endif /* FIFO */
1604: lockmgr_printinfo(&ip->i_lock);
1605: printf("\n");
1606:
1607: #endif /* DIAGNOSTIC */
1608:
1609: return (0);
1610: }
1611:
1612: /*
1613: * Read wrapper for special devices.
1614: */
1615: int
1616: ufsspec_read(void *v)
1617: {
1618: struct vop_read_args *ap = v;
1619:
1620: /*
1621: * Set access flag.
1622: */
1623: VTOI(ap->a_vp)->i_flag |= IN_ACCESS;
1624: return (VOCALL (spec_vnodeop_p, VOFFSET(vop_read), ap));
1625: }
1626:
1627: /*
1628: * Write wrapper for special devices.
1629: */
1630: int
1631: ufsspec_write(void *v)
1632: {
1633: struct vop_write_args *ap = v;
1634:
1635: /*
1636: * Set update and change flags.
1637: */
1638: VTOI(ap->a_vp)->i_flag |= IN_CHANGE | IN_UPDATE;
1639: return (VOCALL (spec_vnodeop_p, VOFFSET(vop_write), ap));
1640: }
1641:
1642: /*
1643: * Close wrapper for special devices.
1644: *
1645: * Update the times on the inode then do device close.
1646: */
1647: int
1648: ufsspec_close(void *v)
1649: {
1650: struct vop_close_args *ap = v;
1651: struct vnode *vp = ap->a_vp;
1652: struct inode *ip = VTOI(vp);
1653:
1654: if (ap->a_vp->v_usecount > 1) {
1655: struct timeval tv;
1656:
1657: getmicrotime(&tv);
1658: ITIMES(ip, &tv, &tv);
1659: }
1660: return (VOCALL (spec_vnodeop_p, VOFFSET(vop_close), ap));
1661: }
1662:
1663: #ifdef FIFO
1664: /*
1665: * Read wrapper for fifo's
1666: */
1667: int
1668: ufsfifo_read(void *v)
1669: {
1670: struct vop_read_args *ap = v;
1671: extern int (**fifo_vnodeop_p)(void *);
1672:
1673: /*
1674: * Set access flag.
1675: */
1676: VTOI(ap->a_vp)->i_flag |= IN_ACCESS;
1677: return (VOCALL (fifo_vnodeop_p, VOFFSET(vop_read), ap));
1678: }
1679:
1680: /*
1681: * Write wrapper for fifo's.
1682: */
1683: int
1684: ufsfifo_write(void *v)
1685: {
1686: struct vop_write_args *ap = v;
1687: extern int (**fifo_vnodeop_p)(void *);
1688:
1689: /*
1690: * Set update and change flags.
1691: */
1692: VTOI(ap->a_vp)->i_flag |= IN_CHANGE | IN_UPDATE;
1693: return (VOCALL (fifo_vnodeop_p, VOFFSET(vop_write), ap));
1694: }
1695:
1696: /*
1697: * Close wrapper for fifo's.
1698: *
1699: * Update the times on the inode then do device close.
1700: */
1701: int
1702: ufsfifo_close(void *v)
1703: {
1704: struct vop_close_args *ap = v;
1705: extern int (**fifo_vnodeop_p)(void *);
1706: struct vnode *vp = ap->a_vp;
1707: struct inode *ip = VTOI(vp);
1708:
1709: if (ap->a_vp->v_usecount > 1) {
1710: struct timeval tv;
1711:
1712: getmicrotime(&tv);
1713: ITIMES(ip, &tv, &tv);
1714: }
1715: return (VOCALL (fifo_vnodeop_p, VOFFSET(vop_close), ap));
1716: }
1717: #endif /* FIFO */
1718:
1719: /*
1720: * Return POSIX pathconf information applicable to ufs filesystems.
1721: */
1722: int
1723: ufs_pathconf(void *v)
1724: {
1725: struct vop_pathconf_args *ap = v;
1726:
1727: switch (ap->a_name) {
1728: case _PC_LINK_MAX:
1729: *ap->a_retval = LINK_MAX;
1730: return (0);
1731: case _PC_NAME_MAX:
1732: *ap->a_retval = NAME_MAX;
1733: return (0);
1734: case _PC_PATH_MAX:
1735: *ap->a_retval = PATH_MAX;
1736: return (0);
1737: case _PC_PIPE_BUF:
1738: *ap->a_retval = PIPE_BUF;
1739: return (0);
1740: case _PC_CHOWN_RESTRICTED:
1741: *ap->a_retval = 1;
1742: return (0);
1743: case _PC_NO_TRUNC:
1744: *ap->a_retval = 1;
1745: return (0);
1746: default:
1747: return (EINVAL);
1748: }
1749: /* NOTREACHED */
1750: }
1751:
1752: /*
1753: * Advisory record locking support
1754: */
1755: int
1756: ufs_advlock(void *v)
1757: {
1758: struct vop_advlock_args *ap = v;
1759: struct inode *ip = VTOI(ap->a_vp);
1760:
1761: return (lf_advlock(&ip->i_lockf, DIP(ip, size), ap->a_id, ap->a_op,
1762: ap->a_fl, ap->a_flags));
1763: }
1764:
1765: /*
1766: * Initialize the vnode associated with a new inode, handle aliased
1767: * vnodes.
1768: */
1769: int
1770: ufs_vinit(struct mount *mntp, int (**specops)(void *),
1771: int (**fifoops)(void *), struct vnode **vpp)
1772: {
1773: struct inode *ip;
1774: struct vnode *vp, *nvp;
1775: struct timeval mtv;
1776:
1777: vp = *vpp;
1778: ip = VTOI(vp);
1779: switch(vp->v_type = IFTOVT(DIP(ip, mode))) {
1780: case VCHR:
1781: case VBLK:
1782: vp->v_op = specops;
1783: if ((nvp = checkalias(vp, DIP(ip, rdev), mntp)) != NULL) {
1784: /*
1785: * Discard unneeded vnode, but save its inode.
1786: * Note that the lock is carried over in the inode
1787: * to the replacement vnode.
1788: */
1789: nvp->v_data = vp->v_data;
1790: vp->v_data = NULL;
1791: vp->v_op = spec_vnodeop_p;
1792: #ifdef VFSDEBUG
1793: vp->v_flag &= ~VLOCKSWORK;
1794: #endif
1795: vrele(vp);
1796: vgone(vp);
1797: /*
1798: * Reinitialize aliased inode.
1799: */
1800: vp = nvp;
1801: ip->i_vnode = vp;
1802: }
1803: break;
1804: case VFIFO:
1805: #ifdef FIFO
1806: vp->v_op = fifoops;
1807: break;
1808: #else
1809: return (EOPNOTSUPP);
1810: #endif
1811: case VNON:
1812: case VBAD:
1813: case VSOCK:
1814: case VLNK:
1815: case VDIR:
1816: case VREG:
1817: break;
1818: }
1819: if (ip->i_number == ROOTINO)
1820: vp->v_flag |= VROOT;
1821: /*
1822: * Initialize modrev times
1823: */
1824: getmicrouptime(&mtv);
1825: SETHIGH(ip->i_modrev, mtv.tv_sec);
1826: SETLOW(ip->i_modrev, mtv.tv_usec * 4294);
1827: *vpp = vp;
1828: return (0);
1829: }
1830:
1831: /*
1832: * Allocate a new inode.
1833: */
1834: int
1835: ufs_makeinode(int mode, struct vnode *dvp, struct vnode **vpp,
1836: struct componentname *cnp)
1837: {
1838: struct inode *ip, *pdir;
1839: struct direct newdir;
1840: struct vnode *tvp;
1841: int error;
1842:
1843: pdir = VTOI(dvp);
1844: #ifdef DIAGNOSTIC
1845: if ((cnp->cn_flags & HASBUF) == 0)
1846: panic("ufs_makeinode: no name");
1847: #endif
1848: *vpp = NULL;
1849: if ((mode & IFMT) == 0)
1850: mode |= IFREG;
1851:
1852: if ((error = UFS_INODE_ALLOC(pdir, mode, cnp->cn_cred, &tvp)) != 0) {
1853: pool_put(&namei_pool, cnp->cn_pnbuf);
1854: vput(dvp);
1855: return (error);
1856: }
1857:
1858: ip = VTOI(tvp);
1859:
1860: DIP_ASSIGN(ip, gid, DIP(pdir, gid));
1861: DIP_ASSIGN(ip, uid, cnp->cn_cred->cr_uid);
1862:
1863: if ((error = getinoquota(ip)) ||
1864: (error = ufs_quota_alloc_inode(ip, cnp->cn_cred))) {
1865: pool_put(&namei_pool, cnp->cn_pnbuf);
1866: UFS_INODE_FREE(ip, ip->i_number, mode);
1867: vput(tvp);
1868: vput(dvp);
1869: return (error);
1870: }
1871:
1872: ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
1873: DIP_ASSIGN(ip, mode, mode);
1874: tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */
1875: ip->i_effnlink = 1;
1876: DIP_ASSIGN(ip, nlink, 1);
1877: if (DOINGSOFTDEP(tvp))
1878: softdep_change_linkcnt(ip, 0);
1879: if ((DIP(ip, mode) & ISGID) &&
1880: !groupmember(DIP(ip, gid), cnp->cn_cred) &&
1881: suser_ucred(cnp->cn_cred))
1882: DIP(ip, mode) &= ~ISGID;
1883:
1884: /*
1885: * Make sure inode goes to disk before directory entry.
1886: */
1887: if ((error = UFS_UPDATE(ip, !DOINGSOFTDEP(tvp))) != 0)
1888: goto bad;
1889:
1890: ufs_makedirentry(ip, cnp, &newdir);
1891: if ((error = ufs_direnter(dvp, tvp, &newdir, cnp, NULL)) != 0)
1892: goto bad;
1893:
1894: if ((cnp->cn_flags & SAVESTART) == 0)
1895: pool_put(&namei_pool, cnp->cn_pnbuf);
1896: vput(dvp);
1897: *vpp = tvp;
1898: return (0);
1899:
1900: bad:
1901: /*
1902: * Write error occurred trying to update the inode
1903: * or the directory so must deallocate the inode.
1904: */
1905: pool_put(&namei_pool, cnp->cn_pnbuf);
1906: vput(dvp);
1907: ip->i_effnlink = 0;
1908: DIP_ASSIGN(ip, nlink, 0);
1909: ip->i_flag |= IN_CHANGE;
1910: if (DOINGSOFTDEP(tvp))
1911: softdep_change_linkcnt(ip, 0);
1912: tvp->v_type = VNON;
1913: vput(tvp);
1914:
1915: return (error);
1916: }
1917:
1918: struct filterops ufsread_filtops =
1919: { 1, NULL, filt_ufsdetach, filt_ufsread };
1920: struct filterops ufswrite_filtops =
1921: { 1, NULL, filt_ufsdetach, filt_ufswrite };
1922: struct filterops ufsvnode_filtops =
1923: { 1, NULL, filt_ufsdetach, filt_ufsvnode };
1924:
1925: int
1926: ufs_kqfilter(void *v)
1927: {
1928: struct vop_kqfilter_args *ap = v;
1929: struct vnode *vp = ap->a_vp;
1930: struct knote *kn = ap->a_kn;
1931:
1932: switch (kn->kn_filter) {
1933: case EVFILT_READ:
1934: kn->kn_fop = &ufsread_filtops;
1935: break;
1936: case EVFILT_WRITE:
1937: kn->kn_fop = &ufswrite_filtops;
1938: break;
1939: case EVFILT_VNODE:
1940: kn->kn_fop = &ufsvnode_filtops;
1941: break;
1942: default:
1943: return (1);
1944: }
1945:
1946: kn->kn_hook = (caddr_t)vp;
1947:
1948: SLIST_INSERT_HEAD(&vp->v_selectinfo.si_note, kn, kn_selnext);
1949:
1950: return (0);
1951: }
1952:
1953: void
1954: filt_ufsdetach(struct knote *kn)
1955: {
1956: struct vnode *vp = (struct vnode *)kn->kn_hook;
1957:
1958: SLIST_REMOVE(&vp->v_selectinfo.si_note, kn, knote, kn_selnext);
1959: }
1960:
1961: /*ARGSUSED*/
1962: int
1963: filt_ufsread(struct knote *kn, long hint)
1964: {
1965: struct vnode *vp = (struct vnode *)kn->kn_hook;
1966: struct inode *ip = VTOI(vp);
1967:
1968: /*
1969: * filesystem is gone, so set the EOF flag and schedule
1970: * the knote for deletion.
1971: */
1972: if (hint == NOTE_REVOKE) {
1973: kn->kn_flags |= (EV_EOF | EV_ONESHOT);
1974: return (1);
1975: }
1976:
1977: kn->kn_data = DIP(ip, size) - kn->kn_fp->f_offset;
1978: if (kn->kn_data == 0 && kn->kn_sfflags & NOTE_EOF) {
1979: kn->kn_fflags |= NOTE_EOF;
1980: return (1);
1981: }
1982:
1983: return (kn->kn_data != 0);
1984: }
1985:
1986: int
1987: filt_ufswrite(struct knote *kn, long hint)
1988: {
1989: /*
1990: * filesystem is gone, so set the EOF flag and schedule
1991: * the knote for deletion.
1992: */
1993: if (hint == NOTE_REVOKE) {
1994: kn->kn_flags |= (EV_EOF | EV_ONESHOT);
1995: return (1);
1996: }
1997:
1998: kn->kn_data = 0;
1999: return (1);
2000: }
2001:
2002: int
2003: filt_ufsvnode(struct knote *kn, long hint)
2004: {
2005: if (kn->kn_sfflags & hint)
2006: kn->kn_fflags |= hint;
2007: if (hint == NOTE_REVOKE) {
2008: kn->kn_flags |= EV_EOF;
2009: return (1);
2010: }
2011: return (kn->kn_fflags != 0);
2012: }