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[dragonfly.git] / sys / kern / vfs_nlookup.c
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1 /*
2 * Copyright (c) 2004 The DragonFly Project. All rights reserved.
3 *
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
16 * distribution.
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
35 * nlookup() is the 'new' namei interface. Rather then return directory and
36 * leaf vnodes (in various lock states) the new interface instead deals in
37 * namecache records. Namecache records may represent both a positive or
38 * a negative hit. The namespace is locked via the namecache record instead
39 * of via the vnode, and only the leaf namecache record (representing the
40 * filename) needs to be locked.
42 * This greatly improves filesystem parallelism and is a huge simplification
43 * of the API verses the old vnode locking / namei scheme.
45 * Filesystems must actively control the caching aspects of the namecache,
46 * and since namecache pointers are used as handles they are non-optional
47 * even for filesystems which do not generally wish to cache things. It is
48 * intended that a separate cache coherency API will be constructed to handle
49 * these issues.
52 #include "opt_ktrace.h"
54 #include <sys/param.h>
55 #include <sys/systm.h>
56 #include <sys/kernel.h>
57 #include <sys/vnode.h>
58 #include <sys/mount.h>
59 #include <sys/filedesc.h>
60 #include <sys/proc.h>
61 #include <sys/namei.h>
62 #include <sys/nlookup.h>
63 #include <sys/malloc.h>
64 #include <sys/stat.h>
65 #include <sys/objcache.h>
66 #include <sys/file.h>
67 #include <sys/kcollect.h>
69 #ifdef KTRACE
70 #include <sys/ktrace.h>
71 #endif
73 static int naccess(struct nchandle *nch, int vmode, struct ucred *cred,
74 int *stickyp);
77 * Initialize a nlookup() structure, early error return for copyin faults
78 * or a degenerate empty string (which is not allowed).
80 * The first process proc0's credentials are used if the calling thread
81 * is not associated with a process context.
83 * MPSAFE
85 int
86 nlookup_init(struct nlookupdata *nd,
87 const char *path, enum uio_seg seg, int flags)
89 size_t pathlen;
90 struct proc *p;
91 thread_t td;
92 int error;
94 td = curthread;
95 p = td->td_proc;
98 * note: the pathlen set by copy*str() includes the terminating \0.
100 bzero(nd, sizeof(struct nlookupdata));
101 nd->nl_path = objcache_get(namei_oc, M_WAITOK);
102 nd->nl_flags |= NLC_HASBUF;
103 if (seg == UIO_SYSSPACE)
104 error = copystr(path, nd->nl_path, MAXPATHLEN, &pathlen);
105 else
106 error = copyinstr(path, nd->nl_path, MAXPATHLEN, &pathlen);
109 * Don't allow empty pathnames.
110 * POSIX.1 requirement: "" is not a vaild file name.
112 if (error == 0 && pathlen <= 1)
113 error = ENOENT;
115 if (error == 0) {
116 if (p && p->p_fd) {
117 cache_copy_ncdir(p, &nd->nl_nch);
118 cache_copy(&p->p_fd->fd_nrdir, &nd->nl_rootnch);
119 if (p->p_fd->fd_njdir.ncp)
120 cache_copy(&p->p_fd->fd_njdir, &nd->nl_jailnch);
121 nd->nl_cred = td->td_ucred;
122 nd->nl_flags |= NLC_BORROWCRED | NLC_NCDIR;
123 } else {
124 cache_copy(&rootnch, &nd->nl_nch);
125 cache_copy(&nd->nl_nch, &nd->nl_rootnch);
126 cache_copy(&nd->nl_nch, &nd->nl_jailnch);
127 nd->nl_cred = proc0.p_ucred;
128 nd->nl_flags |= NLC_BORROWCRED;
130 nd->nl_td = td;
131 nd->nl_flags |= flags;
132 } else {
133 nlookup_done(nd);
135 return(error);
140 * nlookup_init() for "at" family of syscalls.
142 * Works similarly to nlookup_init() but if path is relative and fd is not
143 * AT_FDCWD, path is interpreted relative to the directory pointed to by fd.
144 * In this case, the file entry pointed to by fd is ref'ed and returned in
145 * *fpp.
147 * If the call succeeds, nlookup_done_at() must be called to clean-up the nd
148 * and release the ref to the file entry.
151 nlookup_init_at(struct nlookupdata *nd, struct file **fpp, int fd,
152 const char *path, enum uio_seg seg, int flags)
154 struct thread *td = curthread;
155 struct file* fp;
156 struct vnode *vp;
157 int error;
159 *fpp = NULL;
161 if ((error = nlookup_init(nd, path, seg, flags)) != 0) {
162 return (error);
165 if (nd->nl_path[0] != '/' && fd != AT_FDCWD) {
166 if ((error = holdvnode(td, fd, &fp)) != 0)
167 goto done;
168 vp = (struct vnode*)fp->f_data;
169 if (vp->v_type != VDIR || fp->f_nchandle.ncp == NULL) {
170 fdrop(fp);
171 fp = NULL;
172 error = ENOTDIR;
173 goto done;
175 if (nd->nl_flags & NLC_NCDIR) {
176 cache_drop_ncdir(&nd->nl_nch);
177 nd->nl_flags &= ~NLC_NCDIR;
178 } else {
179 cache_drop(&nd->nl_nch);
181 cache_copy(&fp->f_nchandle, &nd->nl_nch);
182 *fpp = fp;
186 done:
187 if (error)
188 nlookup_done(nd);
189 return (error);
194 * This works similarly to nlookup_init() but does not assume a process
195 * context. rootnch is always chosen for the root directory and the cred
196 * and starting directory are supplied in arguments.
199 nlookup_init_raw(struct nlookupdata *nd,
200 const char *path, enum uio_seg seg, int flags,
201 struct ucred *cred, struct nchandle *ncstart)
203 size_t pathlen;
204 thread_t td;
205 int error;
207 td = curthread;
209 bzero(nd, sizeof(struct nlookupdata));
210 nd->nl_path = objcache_get(namei_oc, M_WAITOK);
211 nd->nl_flags |= NLC_HASBUF;
212 if (seg == UIO_SYSSPACE)
213 error = copystr(path, nd->nl_path, MAXPATHLEN, &pathlen);
214 else
215 error = copyinstr(path, nd->nl_path, MAXPATHLEN, &pathlen);
218 * Don't allow empty pathnames.
219 * POSIX.1 requirement: "" is not a vaild file name.
221 if (error == 0 && pathlen <= 1)
222 error = ENOENT;
224 if (error == 0) {
225 cache_copy(ncstart, &nd->nl_nch);
226 cache_copy(&rootnch, &nd->nl_rootnch);
227 cache_copy(&rootnch, &nd->nl_jailnch);
228 nd->nl_cred = crhold(cred);
229 nd->nl_td = td;
230 nd->nl_flags |= flags;
231 } else {
232 nlookup_done(nd);
234 return(error);
238 * This works similarly to nlookup_init_raw() but does not rely
239 * on rootnch being initialized yet.
242 nlookup_init_root(struct nlookupdata *nd,
243 const char *path, enum uio_seg seg, int flags,
244 struct ucred *cred, struct nchandle *ncstart,
245 struct nchandle *ncroot)
247 size_t pathlen;
248 thread_t td;
249 int error;
251 td = curthread;
253 bzero(nd, sizeof(struct nlookupdata));
254 nd->nl_path = objcache_get(namei_oc, M_WAITOK);
255 nd->nl_flags |= NLC_HASBUF;
256 if (seg == UIO_SYSSPACE)
257 error = copystr(path, nd->nl_path, MAXPATHLEN, &pathlen);
258 else
259 error = copyinstr(path, nd->nl_path, MAXPATHLEN, &pathlen);
262 * Don't allow empty pathnames.
263 * POSIX.1 requirement: "" is not a vaild file name.
265 if (error == 0 && pathlen <= 1)
266 error = ENOENT;
268 if (error == 0) {
269 cache_copy(ncstart, &nd->nl_nch);
270 cache_copy(ncroot, &nd->nl_rootnch);
271 cache_copy(ncroot, &nd->nl_jailnch);
272 nd->nl_cred = crhold(cred);
273 nd->nl_td = td;
274 nd->nl_flags |= flags;
275 } else {
276 nlookup_done(nd);
278 return(error);
281 #if 0
283 * Set a different credential; this credential will be used by future
284 * operations performed on nd.nl_open_vp and nlookupdata structure.
286 void
287 nlookup_set_cred(struct nlookupdata *nd, struct ucred *cred)
289 KKASSERT(nd->nl_cred != NULL);
291 if (nd->nl_cred != cred) {
292 cred = crhold(cred);
293 if ((nd->nl_flags & NLC_BORROWCRED) == 0)
294 crfree(nd->nl_cred);
295 nd->nl_flags &= ~NLC_BORROWCRED;
296 nd->nl_cred = cred;
299 #endif
302 * Cleanup a nlookupdata structure after we are through with it. This may
303 * be called on any nlookupdata structure initialized with nlookup_init().
304 * Calling nlookup_done() is mandatory in all cases except where nlookup_init()
305 * returns an error, even if as a consumer you believe you have taken all
306 * dynamic elements out of the nlookupdata structure.
308 void
309 nlookup_done(struct nlookupdata *nd)
311 if (nd->nl_nch.ncp) {
312 if (nd->nl_flags & NLC_NCPISLOCKED) {
313 nd->nl_flags &= ~NLC_NCPISLOCKED;
314 cache_unlock(&nd->nl_nch);
316 if (nd->nl_flags & NLC_NCDIR) {
317 cache_drop_ncdir(&nd->nl_nch);
318 nd->nl_flags &= ~NLC_NCDIR;
319 } else {
320 cache_drop(&nd->nl_nch); /* NULL's out the nch */
323 if (nd->nl_rootnch.ncp)
324 cache_drop_and_cache(&nd->nl_rootnch);
325 if (nd->nl_jailnch.ncp)
326 cache_drop_and_cache(&nd->nl_jailnch);
327 if ((nd->nl_flags & NLC_HASBUF) && nd->nl_path) {
328 objcache_put(namei_oc, nd->nl_path);
329 nd->nl_path = NULL;
331 if (nd->nl_cred) {
332 if ((nd->nl_flags & NLC_BORROWCRED) == 0)
333 crfree(nd->nl_cred);
334 nd->nl_cred = NULL;
335 nd->nl_flags &= ~NLC_BORROWCRED;
337 if (nd->nl_open_vp) {
338 if (nd->nl_flags & NLC_LOCKVP) {
339 vn_unlock(nd->nl_open_vp);
340 nd->nl_flags &= ~NLC_LOCKVP;
342 vn_close(nd->nl_open_vp, nd->nl_vp_fmode, NULL);
343 nd->nl_open_vp = NULL;
345 if (nd->nl_dvp) {
346 vrele(nd->nl_dvp);
347 nd->nl_dvp = NULL;
349 nd->nl_flags = 0; /* clear remaining flags (just clear everything) */
353 * Works similarly to nlookup_done() when nd initialized with
354 * nlookup_init_at().
356 void
357 nlookup_done_at(struct nlookupdata *nd, struct file *fp)
359 nlookup_done(nd);
360 if (fp != NULL)
361 fdrop(fp);
364 void
365 nlookup_zero(struct nlookupdata *nd)
367 bzero(nd, sizeof(struct nlookupdata));
371 * Simple all-in-one nlookup. Returns a locked namecache structure or NULL
372 * if an error occured.
374 * Note that the returned ncp is not checked for permissions, though VEXEC
375 * is checked on the directory path leading up to the result. The caller
376 * must call naccess() to check the permissions of the returned leaf.
378 struct nchandle
379 nlookup_simple(const char *str, enum uio_seg seg,
380 int niflags, int *error)
382 struct nlookupdata nd;
383 struct nchandle nch;
385 *error = nlookup_init(&nd, str, seg, niflags);
386 if (*error == 0) {
387 if ((*error = nlookup(&nd)) == 0) {
388 nch = nd.nl_nch; /* keep hold ref from structure */
389 cache_zero(&nd.nl_nch); /* and NULL out */
390 } else {
391 cache_zero(&nch);
393 nlookup_done(&nd);
394 } else {
395 cache_zero(&nch);
397 return(nch);
401 * Returns non-zero if the path element is the last element
403 static
405 islastelement(const char *ptr)
407 while (*ptr == '/')
408 ++ptr;
409 return (*ptr == 0);
413 * Returns non-zero if we need to lock the namecache element
414 * exclusively. Unless otherwise requested by NLC_SHAREDLOCK,
415 * the last element of the namecache lookup will be locked
416 * exclusively.
418 * NOTE: Even if we return on-zero, an unresolved namecache record
419 * will always be locked exclusively.
421 static __inline
423 wantsexcllock(struct nlookupdata *nd, const char *ptr)
425 if ((nd->nl_flags & NLC_SHAREDLOCK) == 0)
426 return(islastelement(ptr));
427 return(0);
432 * Do a generic nlookup. Note that the passed nd is not nlookup_done()'d
433 * on return, even if an error occurs. If no error occurs or NLC_CREATE
434 * is flagged and ENOENT is returned, then the returned nl_nch is always
435 * referenced and locked exclusively.
437 * WARNING: For any general error other than ENOENT w/NLC_CREATE, the
438 * the resulting nl_nch may or may not be locked and if locked
439 * might be locked either shared or exclusive.
441 * Intermediate directory elements, including the current directory, require
442 * execute (search) permission. nlookup does not examine the access
443 * permissions on the returned element.
445 * If NLC_CREATE is set the last directory must allow node creation,
446 * and an error code of 0 will be returned for a non-existant
447 * target (not ENOENT).
449 * If NLC_RENAME_DST is set the last directory mut allow node deletion,
450 * plus the sticky check is made, and an error code of 0 will be returned
451 * for a non-existant target (not ENOENT).
453 * If NLC_DELETE is set the last directory mut allow node deletion,
454 * plus the sticky check is made.
456 * If NLC_REFDVP is set nd->nl_dvp will be set to the directory vnode
457 * of the returned entry. The vnode will be referenced, but not locked,
458 * and will be released by nlookup_done() along with everything else.
460 * NOTE: As an optimization we attempt to obtain a shared namecache lock
461 * on any intermediate elements. On success, the returned element
462 * is ALWAYS locked exclusively.
465 nlookup(struct nlookupdata *nd)
467 globaldata_t gd = mycpu;
468 struct nlcomponent nlc;
469 struct nchandle nch;
470 struct nchandle par;
471 struct nchandle nctmp;
472 struct mount *mp;
473 struct vnode *hvp; /* hold to prevent recyclement */
474 int wasdotordotdot;
475 char *ptr;
476 char *nptr;
477 int error;
478 int len;
479 int dflags;
480 int hit = 1;
481 int saveflag = nd->nl_flags & ~NLC_NCDIR;
482 boolean_t doretry = FALSE;
483 boolean_t inretry = FALSE;
485 nlookup_start:
486 #ifdef KTRACE
487 if (KTRPOINT(nd->nl_td, KTR_NAMEI))
488 ktrnamei(nd->nl_td->td_lwp, nd->nl_path);
489 #endif
490 bzero(&nlc, sizeof(nlc));
493 * Setup for the loop. The current working namecache element is
494 * always at least referenced. We lock it as required, but always
495 * return a locked, resolved namecache entry.
497 nd->nl_loopcnt = 0;
498 if (nd->nl_dvp) {
499 vrele(nd->nl_dvp);
500 nd->nl_dvp = NULL;
502 ptr = nd->nl_path;
505 * Loop on the path components. At the top of the loop nd->nl_nch
506 * is ref'd and unlocked and represents our current position.
508 for (;;) {
510 * Make sure nl_nch is locked so we can access the vnode, resolution
511 * state, etc.
513 if ((nd->nl_flags & NLC_NCPISLOCKED) == 0) {
514 nd->nl_flags |= NLC_NCPISLOCKED;
515 cache_lock_maybe_shared(&nd->nl_nch, wantsexcllock(nd, ptr));
519 * Check if the root directory should replace the current
520 * directory. This is done at the start of a translation
521 * or after a symbolic link has been found. In other cases
522 * ptr will never be pointing at a '/'.
524 if (*ptr == '/') {
525 do {
526 ++ptr;
527 } while (*ptr == '/');
528 cache_unlock(&nd->nl_nch);
529 cache_get_maybe_shared(&nd->nl_rootnch, &nch,
530 wantsexcllock(nd, ptr));
531 if (nd->nl_flags & NLC_NCDIR) {
532 cache_drop_ncdir(&nd->nl_nch);
533 nd->nl_flags &= ~NLC_NCDIR;
534 } else {
535 cache_drop(&nd->nl_nch);
537 nd->nl_nch = nch; /* remains locked */
540 * Fast-track termination. There is no parent directory of
541 * the root in the same mount from the point of view of
542 * the caller so return EACCES if NLC_REFDVP is specified,
543 * and EEXIST if NLC_CREATE is also specified.
544 * e.g. 'rmdir /' or 'mkdir /' are not allowed.
546 if (*ptr == 0) {
547 if (nd->nl_flags & NLC_REFDVP)
548 error = (nd->nl_flags & NLC_CREATE) ? EEXIST : EACCES;
549 else
550 error = 0;
551 break;
553 continue;
557 * Pre-calculate next path component so we can check whether the
558 * current component directory is the last directory in the path
559 * or not.
561 for (nptr = ptr; *nptr && *nptr != '/'; ++nptr)
565 * Check directory search permissions (nd->nl_nch is locked & refd).
566 * This will load dflags to obtain directory-special permissions to
567 * be checked along with the last component.
569 * We only need to pass-in &dflags for the second-to-last component.
570 * Optimize by passing-in NULL for any prior components, which may
571 * allow the code to bypass the naccess() call.
573 dflags = 0;
574 if (*nptr == '/')
575 error = naccess(&nd->nl_nch, NLC_EXEC, nd->nl_cred, NULL);
576 else
577 error = naccess(&nd->nl_nch, NLC_EXEC, nd->nl_cred, &dflags);
578 if (error)
579 break;
582 * Extract the next (or last) path component. Path components are
583 * limited to 255 characters.
585 nlc.nlc_nameptr = ptr;
586 nlc.nlc_namelen = nptr - ptr;
587 ptr = nptr;
588 if (nlc.nlc_namelen >= 256) {
589 error = ENAMETOOLONG;
590 break;
594 * Lookup the path component in the cache, creating an unresolved
595 * entry if necessary. We have to handle "." and ".." as special
596 * cases.
598 * When handling ".." we have to detect a traversal back through a
599 * mount point. If we are at the root, ".." just returns the root.
601 * When handling "." or ".." we also have to recalculate dflags
602 * since our dflags will be for some sub-directory instead of the
603 * parent dir.
605 * This subsection returns a locked, refd 'nch' unless it errors out,
606 * and an unlocked but still ref'd nd->nl_nch.
608 * The namecache topology is not allowed to be disconnected, so
609 * encountering a NULL parent will generate EINVAL. This typically
610 * occurs when a directory is removed out from under a process.
612 * WARNING! The unlocking of nd->nl_nch is sensitive code.
614 KKASSERT(nd->nl_flags & NLC_NCPISLOCKED);
616 if (nlc.nlc_namelen == 1 && nlc.nlc_nameptr[0] == '.') {
617 cache_unlock(&nd->nl_nch);
618 nd->nl_flags &= ~NLC_NCPISLOCKED;
619 cache_get_maybe_shared(&nd->nl_nch, &nch, wantsexcllock(nd, ptr));
620 wasdotordotdot = 1;
621 } else if (nlc.nlc_namelen == 2 &&
622 nlc.nlc_nameptr[0] == '.' && nlc.nlc_nameptr[1] == '.') {
623 if (nd->nl_nch.mount == nd->nl_rootnch.mount &&
624 nd->nl_nch.ncp == nd->nl_rootnch.ncp
627 * ".." at the root returns the root
629 cache_unlock(&nd->nl_nch);
630 nd->nl_flags &= ~NLC_NCPISLOCKED;
631 cache_get_maybe_shared(&nd->nl_nch, &nch,
632 wantsexcllock(nd, ptr));
633 } else {
635 * Locate the parent ncp. If we are at the root of a
636 * filesystem mount we have to skip to the mounted-on
637 * point in the underlying filesystem.
639 * Expect the parent to always be good since the
640 * mountpoint doesn't go away. XXX hack. cache_get()
641 * requires the ncp to already have a ref as a safety.
643 * However, a process which has been broken out of a chroot
644 * will wind up with a NULL parent if it tries to '..' above
645 * the real root, deal with the case. Note that this does
646 * not protect us from a jail breakout, it just stops a panic
647 * if the jail-broken process tries to '..' past the real
648 * root.
650 nctmp = nd->nl_nch;
651 while (nctmp.ncp == nctmp.mount->mnt_ncmountpt.ncp) {
652 nctmp = nctmp.mount->mnt_ncmounton;
653 if (nctmp.ncp == NULL)
654 break;
656 if (nctmp.ncp == NULL) {
657 if (curthread->td_proc) {
658 kprintf("vfs_nlookup: '..' traverse broke "
659 "jail: pid %d (%s)\n",
660 curthread->td_proc->p_pid,
661 curthread->td_comm);
663 nctmp = nd->nl_rootnch;
664 } else {
665 nctmp.ncp = nctmp.ncp->nc_parent;
667 cache_hold(&nctmp);
668 cache_unlock(&nd->nl_nch);
669 nd->nl_flags &= ~NLC_NCPISLOCKED;
670 cache_get_maybe_shared(&nctmp, &nch, wantsexcllock(nd, ptr));
671 cache_drop(&nctmp); /* NOTE: zero's nctmp */
673 wasdotordotdot = 2;
674 } else {
676 * Must unlock nl_nch when traversing down the path. However,
677 * the child ncp has not yet been found/created and the parent's
678 * child list might be empty. Thus releasing the lock can
679 * allow a race whereby the parent ncp's vnode is recycled.
680 * This case can occur especially when maxvnodes is set very low.
682 * We need the parent's ncp to remain resolved for all normal
683 * filesystem activities, so we vhold() the vp during the lookup
684 * to prevent recyclement due to vnlru / maxvnodes.
686 * If we race an unlink or rename the ncp might be marked
687 * DESTROYED after resolution, requiring a retry.
689 if ((hvp = nd->nl_nch.ncp->nc_vp) != NULL)
690 vhold(hvp);
691 cache_unlock(&nd->nl_nch);
692 nd->nl_flags &= ~NLC_NCPISLOCKED;
693 error = cache_nlookup_maybe_shared(&nd->nl_nch, &nlc,
694 wantsexcllock(nd, ptr), &nch);
695 if (error == EWOULDBLOCK) {
696 nch = cache_nlookup(&nd->nl_nch, &nlc);
697 if (nch.ncp->nc_flag & NCF_UNRESOLVED)
698 hit = 0;
699 for (;;) {
700 error = cache_resolve(&nch, nd->nl_cred);
701 if (error != EAGAIN &&
702 (nch.ncp->nc_flag & NCF_DESTROYED) == 0) {
703 if (error == ESTALE) {
704 if (!inretry)
705 error = ENOENT;
706 doretry = TRUE;
708 break;
710 kprintf("[diagnostic] nlookup: relookup %*.*s\n",
711 nch.ncp->nc_nlen, nch.ncp->nc_nlen,
712 nch.ncp->nc_name);
713 cache_put(&nch);
714 nch = cache_nlookup(&nd->nl_nch, &nlc);
717 if (hvp)
718 vdrop(hvp);
719 wasdotordotdot = 0;
723 * If the last component was "." or ".." our dflags no longer
724 * represents the parent directory and we have to explicitly
725 * look it up.
727 * Expect the parent to be good since nch is locked.
729 if (wasdotordotdot && error == 0) {
730 dflags = 0;
731 if ((par.ncp = nch.ncp->nc_parent) != NULL) {
732 par.mount = nch.mount;
733 cache_hold(&par);
734 cache_lock_maybe_shared(&par, wantsexcllock(nd, ptr));
735 error = naccess(&par, 0, nd->nl_cred, &dflags);
736 cache_put(&par);
741 * [end of subsection]
743 * nch is locked and referenced.
744 * nd->nl_nch is unlocked and referenced.
746 * nl_nch must be unlocked or we could chain lock to the root
747 * if a resolve gets stuck (e.g. in NFS).
749 KKASSERT((nd->nl_flags & NLC_NCPISLOCKED) == 0);
752 * Resolve the namespace if necessary. The ncp returned by
753 * cache_nlookup() is referenced and locked.
755 * XXX neither '.' nor '..' should return EAGAIN since they were
756 * previously resolved and thus cannot be newly created ncp's.
758 if (nch.ncp->nc_flag & NCF_UNRESOLVED) {
759 hit = 0;
760 error = cache_resolve(&nch, nd->nl_cred);
761 if (error == ESTALE) {
762 if (!inretry)
763 error = ENOENT;
764 doretry = TRUE;
766 KKASSERT(error != EAGAIN);
767 } else {
768 error = nch.ncp->nc_error;
772 * Early completion. ENOENT is not an error if this is the last
773 * component and NLC_CREATE or NLC_RENAME (rename target) was
774 * requested. Note that ncp->nc_error is left as ENOENT in that
775 * case, which we check later on.
777 * Also handle invalid '.' or '..' components terminating a path
778 * for a create/rename/delete. The standard requires this and pax
779 * pretty stupidly depends on it.
781 if (islastelement(ptr)) {
782 if (error == ENOENT &&
783 (nd->nl_flags & (NLC_CREATE | NLC_RENAME_DST))
785 if (nd->nl_flags & NLC_NFS_RDONLY) {
786 error = EROFS;
787 } else {
788 error = naccess(&nch, nd->nl_flags | dflags,
789 nd->nl_cred, NULL);
792 if (error == 0 && wasdotordotdot &&
793 (nd->nl_flags & (NLC_CREATE | NLC_DELETE |
794 NLC_RENAME_SRC | NLC_RENAME_DST))) {
796 * POSIX junk
798 if (nd->nl_flags & NLC_CREATE)
799 error = EEXIST;
800 else if (nd->nl_flags & NLC_DELETE)
801 error = (wasdotordotdot == 1) ? EINVAL : ENOTEMPTY;
802 else
803 error = EINVAL;
808 * Early completion on error.
810 if (error) {
811 cache_put(&nch);
812 break;
816 * If the element is a symlink and it is either not the last
817 * element or it is the last element and we are allowed to
818 * follow symlinks, resolve the symlink.
820 if ((nch.ncp->nc_flag & NCF_ISSYMLINK) &&
821 (*ptr || (nd->nl_flags & NLC_FOLLOW))
823 if (nd->nl_loopcnt++ >= MAXSYMLINKS) {
824 error = ELOOP;
825 cache_put(&nch);
826 break;
828 error = nreadsymlink(nd, &nch, &nlc);
829 cache_put(&nch);
830 if (error)
831 break;
834 * Concatenate trailing path elements onto the returned symlink.
835 * Note that if the path component (ptr) is not exhausted, it
836 * will being with a '/', so we do not have to add another one.
838 * The symlink may not be empty.
840 len = strlen(ptr);
841 if (nlc.nlc_namelen == 0 || nlc.nlc_namelen + len >= MAXPATHLEN) {
842 error = nlc.nlc_namelen ? ENAMETOOLONG : ENOENT;
843 objcache_put(namei_oc, nlc.nlc_nameptr);
844 break;
846 bcopy(ptr, nlc.nlc_nameptr + nlc.nlc_namelen, len + 1);
847 if (nd->nl_flags & NLC_HASBUF)
848 objcache_put(namei_oc, nd->nl_path);
849 nd->nl_path = nlc.nlc_nameptr;
850 nd->nl_flags |= NLC_HASBUF;
851 ptr = nd->nl_path;
854 * Go back up to the top to resolve any initial '/'s in the
855 * symlink.
857 continue;
861 * If the element is a directory and we are crossing a mount point,
862 * Locate the mount.
864 while ((nch.ncp->nc_flag & NCF_ISMOUNTPT) &&
865 (nd->nl_flags & NLC_NOCROSSMOUNT) == 0 &&
866 (mp = cache_findmount(&nch)) != NULL
868 struct vnode *tdp;
869 int vfs_do_busy = 0;
872 * VFS must be busied before the namecache entry is locked,
873 * but we don't want to waste time calling vfs_busy() if the
874 * mount point is already resolved.
876 again:
877 cache_put(&nch);
878 if (vfs_do_busy) {
879 while (vfs_busy(mp, 0)) {
880 if (mp->mnt_kern_flag & MNTK_UNMOUNT) {
881 kprintf("nlookup: warning umount race avoided\n");
882 cache_dropmount(mp);
883 error = EBUSY;
884 vfs_do_busy = 0;
885 goto double_break;
889 cache_get_maybe_shared(&mp->mnt_ncmountpt, &nch,
890 wantsexcllock(nd, ptr));
892 if (nch.ncp->nc_flag & NCF_UNRESOLVED) {
893 if (vfs_do_busy == 0) {
894 vfs_do_busy = 1;
895 goto again;
897 error = VFS_ROOT(mp, &tdp);
898 vfs_unbusy(mp);
899 vfs_do_busy = 0;
900 if (error) {
901 cache_dropmount(mp);
902 break;
904 cache_setvp(&nch, tdp);
905 vput(tdp);
907 if (vfs_do_busy)
908 vfs_unbusy(mp);
909 cache_dropmount(mp);
912 if (error) {
913 cache_put(&nch);
914 double_break:
915 break;
919 * Skip any slashes to get to the next element. If there
920 * are any slashes at all the current element must be a
921 * directory or, in the create case, intended to become a directory.
922 * If it isn't we break without incrementing ptr and fall through
923 * to the failure case below.
925 while (*ptr == '/') {
926 if ((nch.ncp->nc_flag & NCF_ISDIR) == 0 &&
927 !(nd->nl_flags & NLC_WILLBEDIR)
929 break;
931 ++ptr;
935 * Continuation case: additional elements and the current
936 * element is a directory.
938 if (*ptr && (nch.ncp->nc_flag & NCF_ISDIR)) {
939 if (nd->nl_flags & NLC_NCDIR) {
940 cache_drop_ncdir(&nd->nl_nch);
941 nd->nl_flags &= ~NLC_NCDIR;
942 } else {
943 cache_drop(&nd->nl_nch);
945 cache_unlock(&nch);
946 KKASSERT((nd->nl_flags & NLC_NCPISLOCKED) == 0);
947 nd->nl_nch = nch;
948 continue;
952 * Failure case: additional elements and the current element
953 * is not a directory
955 if (*ptr) {
956 cache_put(&nch);
957 error = ENOTDIR;
958 break;
962 * Successful lookup of last element.
964 * Check permissions if the target exists. If the target does not
965 * exist directory permissions were already tested in the early
966 * completion code above.
968 * nd->nl_flags will be adjusted on return with NLC_APPENDONLY
969 * if the file is marked append-only, and NLC_STICKY if the directory
970 * containing the file is sticky.
972 if (nch.ncp->nc_vp && (nd->nl_flags & NLC_ALLCHKS)) {
973 error = naccess(&nch, nd->nl_flags | dflags,
974 nd->nl_cred, NULL);
975 if (error) {
976 cache_put(&nch);
977 break;
982 * Termination: no more elements.
984 * If NLC_REFDVP is set acquire a referenced parent dvp.
986 if (nd->nl_flags & NLC_REFDVP) {
987 cache_lock(&nd->nl_nch);
988 error = cache_vref(&nd->nl_nch, nd->nl_cred, &nd->nl_dvp);
989 cache_unlock(&nd->nl_nch);
990 if (error) {
991 kprintf("NLC_REFDVP: Cannot ref dvp of %p\n", nch.ncp);
992 cache_put(&nch);
993 break;
996 if (nd->nl_flags & NLC_NCDIR) {
997 cache_drop_ncdir(&nd->nl_nch);
998 nd->nl_flags &= ~NLC_NCDIR;
999 } else {
1000 cache_drop(&nd->nl_nch);
1002 nd->nl_nch = nch;
1003 nd->nl_flags |= NLC_NCPISLOCKED;
1004 error = 0;
1005 break;
1008 if (hit)
1009 ++gd->gd_nchstats->ncs_longhits;
1010 else
1011 ++gd->gd_nchstats->ncs_longmiss;
1013 if (nd->nl_flags & NLC_NCPISLOCKED)
1014 KKASSERT(cache_lockstatus(&nd->nl_nch) > 0);
1017 * Retry the whole thing if doretry flag is set, but only once.
1018 * autofs(5) may mount another filesystem under its root directory
1019 * while resolving a path.
1021 if (doretry && !inretry) {
1022 inretry = TRUE;
1023 nd->nl_flags &= NLC_NCDIR;
1024 nd->nl_flags |= saveflag;
1025 goto nlookup_start;
1029 * NOTE: If NLC_CREATE was set the ncp may represent a negative hit
1030 * (ncp->nc_error will be ENOENT), but we will still return an error
1031 * code of 0.
1033 return(error);
1037 * Resolve a mount point's glue ncp. This ncp connects creates the illusion
1038 * of continuity in the namecache tree by connecting the ncp related to the
1039 * vnode under the mount to the ncp related to the mount's root vnode.
1041 * If no error occured a locked, ref'd ncp is stored in *ncpp.
1044 nlookup_mp(struct mount *mp, struct nchandle *nch)
1046 struct vnode *vp;
1047 int error;
1049 error = 0;
1050 cache_get(&mp->mnt_ncmountpt, nch);
1051 if (nch->ncp->nc_flag & NCF_UNRESOLVED) {
1052 while (vfs_busy(mp, 0))
1054 error = VFS_ROOT(mp, &vp);
1055 vfs_unbusy(mp);
1056 if (error) {
1057 cache_put(nch);
1058 } else {
1059 cache_setvp(nch, vp);
1060 vput(vp);
1063 return(error);
1067 * Read the contents of a symlink, allocate a path buffer out of the
1068 * namei_oc and initialize the supplied nlcomponent with the result.
1070 * If an error occurs no buffer will be allocated or returned in the nlc.
1073 nreadsymlink(struct nlookupdata *nd, struct nchandle *nch,
1074 struct nlcomponent *nlc)
1076 struct vnode *vp;
1077 struct iovec aiov;
1078 struct uio auio;
1079 int linklen;
1080 int error;
1081 char *cp;
1083 nlc->nlc_nameptr = NULL;
1084 nlc->nlc_namelen = 0;
1085 if (nch->ncp->nc_vp == NULL)
1086 return(ENOENT);
1087 if ((error = cache_vget(nch, nd->nl_cred, LK_SHARED, &vp)) != 0)
1088 return(error);
1089 cp = objcache_get(namei_oc, M_WAITOK);
1090 aiov.iov_base = cp;
1091 aiov.iov_len = MAXPATHLEN;
1092 auio.uio_iov = &aiov;
1093 auio.uio_iovcnt = 1;
1094 auio.uio_offset = 0;
1095 auio.uio_rw = UIO_READ;
1096 auio.uio_segflg = UIO_SYSSPACE;
1097 auio.uio_td = nd->nl_td;
1098 auio.uio_resid = MAXPATHLEN - 1;
1099 error = VOP_READLINK(vp, &auio, nd->nl_cred);
1100 if (error)
1101 goto fail;
1102 linklen = MAXPATHLEN - 1 - auio.uio_resid;
1103 if (varsym_enable) {
1104 linklen = varsymreplace(cp, linklen, MAXPATHLEN - 1);
1105 if (linklen < 0) {
1106 error = ENAMETOOLONG;
1107 goto fail;
1110 cp[linklen] = 0;
1111 nlc->nlc_nameptr = cp;
1112 nlc->nlc_namelen = linklen;
1113 vput(vp);
1114 return(0);
1115 fail:
1116 objcache_put(namei_oc, cp);
1117 vput(vp);
1118 return(error);
1122 * Check access [XXX cache vattr!] [XXX quota]
1124 * Generally check the NLC_* access bits. All specified bits must pass
1125 * for this function to return 0.
1127 * The file does not have to exist when checking NLC_CREATE or NLC_RENAME_DST
1128 * access, otherwise it must exist. No error is returned in this case.
1130 * The file must not exist if NLC_EXCL is specified.
1132 * Directory permissions in general are tested for NLC_CREATE if the file
1133 * does not exist, NLC_DELETE if the file does exist, and NLC_RENAME_DST
1134 * whether the file exists or not.
1136 * The directory sticky bit is tested for NLC_DELETE and NLC_RENAME_DST,
1137 * the latter is only tested if the target exists.
1139 * The passed ncp must be referenced and locked. If it is already resolved
1140 * it may be locked shared but otherwise should be locked exclusively.
1143 #define S_WXOK_MASK (S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH)
1145 static int
1146 naccess(struct nchandle *nch, int nflags, struct ucred *cred, int *nflagsp)
1148 struct vnode *vp;
1149 struct vattr va;
1150 struct namecache *ncp;
1151 int error;
1152 int cflags;
1154 KKASSERT(cache_lockstatus(nch) > 0);
1156 ncp = nch->ncp;
1157 if (ncp->nc_flag & NCF_UNRESOLVED) {
1158 cache_resolve(nch, cred);
1159 ncp = nch->ncp;
1161 error = ncp->nc_error;
1164 * Directory permissions checks. Silently ignore ENOENT if these
1165 * tests pass. It isn't an error.
1167 * We can safely resolve ncp->nc_parent because ncp is currently
1168 * locked.
1170 if (nflags & (NLC_CREATE | NLC_DELETE | NLC_RENAME_SRC | NLC_RENAME_DST)) {
1171 if (((nflags & NLC_CREATE) && ncp->nc_vp == NULL) ||
1172 ((nflags & NLC_DELETE) && ncp->nc_vp != NULL) ||
1173 ((nflags & NLC_RENAME_SRC) && ncp->nc_vp != NULL) ||
1174 (nflags & NLC_RENAME_DST)
1176 struct nchandle par;
1178 if ((par.ncp = ncp->nc_parent) == NULL) {
1179 if (error != EAGAIN)
1180 error = EINVAL;
1181 } else if (error == 0 || error == ENOENT) {
1182 par.mount = nch->mount;
1183 cache_hold(&par);
1184 cache_lock_maybe_shared(&par, 0);
1185 error = naccess(&par, NLC_WRITE, cred, NULL);
1186 cache_put(&par);
1192 * NLC_EXCL check. Target file must not exist.
1194 if (error == 0 && (nflags & NLC_EXCL) && ncp->nc_vp != NULL)
1195 error = EEXIST;
1198 * Try to short-cut the vnode operation for intermediate directory
1199 * components. This is a major SMP win because it avoids having
1200 * to execute a lot of code for intermediate directory components,
1201 * including shared refs and locks on intermediate directory vnodes.
1203 * We can only do this if the caller does not need nflagsp.
1205 if (error == 0 && nflagsp == NULL &&
1206 nflags == NLC_EXEC && (ncp->nc_flag & NCF_WXOK)) {
1207 return 0;
1211 * Get the vnode attributes so we can do the rest of our checks.
1213 * NOTE: We only call naccess_va() if the target exists.
1215 if (error == 0) {
1216 error = cache_vget(nch, cred, LK_SHARED, &vp);
1217 if (error == ENOENT) {
1219 * Silently zero-out ENOENT if creating or renaming
1220 * (rename target). It isn't an error.
1222 if (nflags & (NLC_CREATE | NLC_RENAME_DST))
1223 error = 0;
1224 } else if (error == 0) {
1226 * Get the vnode attributes and check for illegal O_TRUNC
1227 * requests and read-only mounts.
1229 * NOTE: You can still open devices on read-only mounts for
1230 * writing.
1232 * NOTE: creates/deletes/renames are handled by the NLC_WRITE
1233 * check on the parent directory above.
1235 * XXX cache the va in the namecache or in the vnode
1237 error = VOP_GETATTR(vp, &va);
1238 if (error == 0 && (nflags & NLC_TRUNCATE)) {
1239 switch(va.va_type) {
1240 case VREG:
1241 case VDATABASE:
1242 case VCHR:
1243 case VBLK:
1244 case VFIFO:
1245 break;
1246 case VDIR:
1247 error = EISDIR;
1248 break;
1249 default:
1250 error = EINVAL;
1251 break;
1254 if (error == 0 && (nflags & NLC_WRITE) && vp->v_mount &&
1255 (vp->v_mount->mnt_flag & MNT_RDONLY)
1257 switch(va.va_type) {
1258 case VDIR:
1259 case VLNK:
1260 case VREG:
1261 case VDATABASE:
1262 error = EROFS;
1263 break;
1264 default:
1265 break;
1268 vput(vp);
1271 * Check permissions based on file attributes. The passed
1272 * flags (*nflagsp) are modified with feedback based on
1273 * special attributes and requirements.
1275 if (error == 0) {
1277 * Adjust the returned (*nflagsp) if non-NULL.
1279 if (nflagsp) {
1280 if ((va.va_mode & VSVTX) && va.va_uid != cred->cr_uid)
1281 *nflagsp |= NLC_STICKY;
1282 if (va.va_flags & APPEND)
1283 *nflagsp |= NLC_APPENDONLY;
1284 if (va.va_flags & IMMUTABLE)
1285 *nflagsp |= NLC_IMMUTABLE;
1289 * NCF_WXOK can be set for world-searchable directories.
1291 * XXX When we implement capabilities this code would also
1292 * need a cap check, or only set the flag if there are no
1293 * capabilities.
1295 cflags = 0;
1296 if (va.va_type == VDIR &&
1297 (va.va_mode & S_WXOK_MASK) == S_WXOK_MASK) {
1298 cflags |= NCF_WXOK;
1302 * Track swapcache management flags in the namecache.
1304 * Calculate the flags based on the current vattr info
1305 * and recalculate the inherited flags from the parent
1306 * (the original cache linkage may have occurred without
1307 * getattrs and thus have stale flags).
1309 if (va.va_flags & SF_NOCACHE)
1310 cflags |= NCF_SF_NOCACHE;
1311 if (va.va_flags & UF_CACHE)
1312 cflags |= NCF_UF_CACHE;
1313 if (ncp->nc_parent) {
1314 if (ncp->nc_parent->nc_flag &
1315 (NCF_SF_NOCACHE | NCF_SF_PNOCACHE)) {
1316 cflags |= NCF_SF_PNOCACHE;
1318 if (ncp->nc_parent->nc_flag &
1319 (NCF_UF_CACHE | NCF_UF_PCACHE)) {
1320 cflags |= NCF_UF_PCACHE;
1325 * We're not supposed to update nc_flag when holding a shared
1326 * lock, but we allow the case for certain flags. Note that
1327 * holding an exclusive lock allows updating nc_flag without
1328 * atomics. nc_flag is not allowe to be updated at all unless
1329 * a shared or exclusive lock is held.
1331 atomic_clear_short(&ncp->nc_flag,
1332 (NCF_SF_NOCACHE | NCF_UF_CACHE |
1333 NCF_SF_PNOCACHE | NCF_UF_PCACHE |
1334 NCF_WXOK) & ~cflags);
1335 atomic_set_short(&ncp->nc_flag, cflags);
1338 * Process general access.
1340 error = naccess_va(&va, nflags, cred);
1344 return(error);
1348 * Check the requested access against the given vattr using cred.
1351 naccess_va(struct vattr *va, int nflags, struct ucred *cred)
1353 int i;
1354 int vmode;
1357 * Test the immutable bit. Creations, deletions, renames (source
1358 * or destination) are not allowed. chown/chmod/other is also not
1359 * allowed but is handled by SETATTR. Hardlinks to the immutable
1360 * file are allowed.
1362 * If the directory is set to immutable then creations, deletions,
1363 * renames (source or dest) and hardlinks to files within the directory
1364 * are not allowed, and regular files opened through the directory may
1365 * not be written to or truncated (unless a special device).
1367 * NOTE! New hardlinks to immutable files work but new hardlinks to
1368 * files, immutable or not, sitting inside an immutable directory are
1369 * not allowed. As always if the file is hardlinked via some other
1370 * path additional hardlinks may be possible even if the file is marked
1371 * immutable. The sysop needs to create a closure by checking the hard
1372 * link count. Once closure is achieved you are good, and security
1373 * scripts should check link counts anyway.
1375 * Writes and truncations are only allowed on special devices.
1377 if ((va->va_flags & IMMUTABLE) || (nflags & NLC_IMMUTABLE)) {
1378 if ((nflags & NLC_IMMUTABLE) && (nflags & NLC_HLINK))
1379 return (EPERM);
1380 if (nflags & (NLC_CREATE | NLC_DELETE |
1381 NLC_RENAME_SRC | NLC_RENAME_DST)) {
1382 return (EPERM);
1384 if (nflags & (NLC_WRITE | NLC_TRUNCATE)) {
1385 switch(va->va_type) {
1386 case VDIR:
1387 return (EISDIR);
1388 case VLNK:
1389 case VREG:
1390 case VDATABASE:
1391 return (EPERM);
1392 default:
1393 break;
1399 * Test the no-unlink and append-only bits for opens, rename targets,
1400 * and deletions. These bits are not tested for creations or
1401 * rename sources.
1403 * Unlike FreeBSD we allow a file with APPEND set to be renamed.
1404 * If you do not wish this you must also set NOUNLINK.
1406 * If the governing directory is marked APPEND-only it implies
1407 * NOUNLINK for all entries in the directory.
1409 if (((va->va_flags & NOUNLINK) || (nflags & NLC_APPENDONLY)) &&
1410 (nflags & (NLC_DELETE | NLC_RENAME_SRC | NLC_RENAME_DST))
1412 return (EPERM);
1416 * A file marked append-only may not be deleted but can be renamed.
1418 if ((va->va_flags & APPEND) &&
1419 (nflags & (NLC_DELETE | NLC_RENAME_DST))
1421 return (EPERM);
1425 * A file marked append-only which is opened for writing must also
1426 * be opened O_APPEND.
1428 if ((va->va_flags & APPEND) && (nflags & (NLC_OPEN | NLC_TRUNCATE))) {
1429 if (nflags & NLC_TRUNCATE)
1430 return (EPERM);
1431 if ((nflags & (NLC_OPEN | NLC_WRITE)) == (NLC_OPEN | NLC_WRITE)) {
1432 if ((nflags & NLC_APPEND) == 0)
1433 return (EPERM);
1438 * root gets universal access
1440 if (cred->cr_uid == 0)
1441 return(0);
1444 * Check owner perms.
1446 * If NLC_OWN is set the owner of the file is allowed no matter when
1447 * the owner-mode bits say (utimes).
1449 vmode = 0;
1450 if (nflags & NLC_READ)
1451 vmode |= S_IRUSR;
1452 if (nflags & NLC_WRITE)
1453 vmode |= S_IWUSR;
1454 if (nflags & NLC_EXEC)
1455 vmode |= S_IXUSR;
1457 if (cred->cr_uid == va->va_uid) {
1458 if ((nflags & NLC_OWN) == 0) {
1459 if ((vmode & va->va_mode) != vmode)
1460 return(EACCES);
1462 return(0);
1466 * If NLC_STICKY is set only the owner may delete or rename a file.
1467 * This bit is typically set on /tmp.
1469 * Note that the NLC_READ/WRITE/EXEC bits are not typically set in
1470 * the specific delete or rename case. For deletions and renames we
1471 * usually just care about directory permissions, not file permissions.
1473 if ((nflags & NLC_STICKY) &&
1474 (nflags & (NLC_RENAME_SRC | NLC_RENAME_DST | NLC_DELETE))) {
1475 return(EACCES);
1479 * Check group perms
1481 vmode >>= 3;
1482 for (i = 0; i < cred->cr_ngroups; ++i) {
1483 if (va->va_gid == cred->cr_groups[i]) {
1484 if ((vmode & va->va_mode) != vmode)
1485 return(EACCES);
1486 return(0);
1491 * Check world perms
1493 vmode >>= 3;
1494 if ((vmode & va->va_mode) != vmode)
1495 return(EACCES);
1496 return(0);
1500 * Long-term (10-second interval) statistics collection
1502 static
1503 uint64_t
1504 collect_nlookup_callback(int n)
1506 static uint64_t last_total;
1507 uint64_t save;
1508 uint64_t total;
1510 total = 0;
1511 for (n = 0; n < ncpus; ++n) {
1512 globaldata_t gd = globaldata_find(n);
1513 struct nchstats *sp;
1515 if ((sp = gd->gd_nchstats) != NULL)
1516 total += sp->ncs_longhits + sp->ncs_longmiss;
1518 save = total;
1519 total = total - last_total;
1520 last_total = save;
1522 return total;
1525 static
1526 void
1527 nlookup_collect_init(void *dummy __unused)
1529 kcollect_register(KCOLLECT_NLOOKUP, "nlookup", collect_nlookup_callback,
1530 KCOLLECT_SCALE(KCOLLECT_NLOOKUP_FORMAT, 0));
1532 SYSINIT(collect_nlookup, SI_SUB_PROP, SI_ORDER_ANY, nlookup_collect_init, 0);