1 /* $FreeBSD$ */
2 /* $NetBSD: msdosfs_denode.c,v 1.28 1998/02/10 14:10:00 mrg Exp $ */
3
4 /*-
5 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
6 * Copyright (C) 1994, 1995, 1997 TooLs GmbH.
7 * All rights reserved.
8 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by TooLs GmbH.
21 * 4. The name of TooLs GmbH may not be used to endorse or promote products
22 * derived from this software without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
27 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
29 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
30 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
31 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
32 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
33 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35 /*
36 * Written by Paul Popelka (paulp@uts.amdahl.com)
37 *
38 * You can do anything you want with this software, just don't say you wrote
39 * it, and don't remove this notice.
40 *
41 * This software is provided "as is".
42 *
43 * The author supplies this software to be publicly redistributed on the
44 * understanding that the author is not responsible for the correct
45 * functioning of this software in any circumstances and is not liable for
46 * any damages caused by this software.
47 *
48 * October 1992
49 */
50
51 #include <sys/param.h>
52 #include <sys/systm.h>
53 #include <sys/kernel.h>
54 #include <sys/mount.h>
55 #include <sys/malloc.h>
56 #include <sys/proc.h>
57 #include <sys/buf.h>
58 #include <sys/vnode.h>
59
60 #include <vm/vm.h>
61 #include <vm/vm_extern.h>
62
63 #include <msdosfs/bpb.h>
64 #include <msdosfs/msdosfsmount.h>
65 #include <msdosfs/direntry.h>
66 #include <msdosfs/denode.h>
67 #include <msdosfs/fat.h>
68
69 static MALLOC_DEFINE(M_MSDOSFSNODE, "MSDOSFS node", "MSDOSFS vnode private part");
70
71 static struct denode **dehashtbl;
72 static u_long dehash; /* size of hash table - 1 */
73 #define DEHASH(dev, dcl, doff) (dehashtbl[(minor(dev) + (dcl) + (doff) / \
74 sizeof(struct direntry)) & dehash])
75 #ifndef NULL_SIMPLELOCKS
76 static struct simplelock dehash_slock;
77 #endif
78
79 union _qcvt {
80 quad_t qcvt;
81 long val[2];
82 };
83 #define SETHIGH(q, h) { \
84 union _qcvt tmp; \
85 tmp.qcvt = (q); \
86 tmp.val[_QUAD_HIGHWORD] = (h); \
87 (q) = tmp.qcvt; \
88 }
89 #define SETLOW(q, l) { \
90 union _qcvt tmp; \
91 tmp.qcvt = (q); \
92 tmp.val[_QUAD_LOWWORD] = (l); \
93 (q) = tmp.qcvt; \
94 }
95
96 static struct denode *
97 msdosfs_hashget __P((dev_t dev, u_long dirclust,
98 u_long diroff));
99 static void msdosfs_hashins __P((struct denode *dep));
100 static void msdosfs_hashrem __P((struct denode *dep));
101
102 /*ARGSUSED*/
103 int
104 msdosfs_init(vfsp)
105 struct vfsconf *vfsp;
106 {
107 dehashtbl = hashinit(desiredvnodes/2, M_MSDOSFSMNT, &dehash);
108 simple_lock_init(&dehash_slock);
109 return (0);
110 }
111
112 int
113 msdosfs_uninit(vfsp)
114 struct vfsconf *vfsp;
115 {
116
117 if (dehashtbl)
118 free(dehashtbl, M_MSDOSFSMNT);
119 return (0);
120 }
121
122 static struct denode *
123 msdosfs_hashget(dev, dirclust, diroff)
124 dev_t dev;
125 u_long dirclust;
126 u_long diroff;
127 {
128 struct proc *p = curproc; /* XXX */
129 struct denode *dep;
130 struct vnode *vp;
131
132 loop:
133 simple_lock(&dehash_slock);
134 for (dep = DEHASH(dev, dirclust, diroff); dep; dep = dep->de_next) {
135 if (dirclust == dep->de_dirclust
136 && diroff == dep->de_diroffset
137 && dev == dep->de_dev
138 && dep->de_refcnt != 0) {
139 vp = DETOV(dep);
140 simple_lock(&vp->v_interlock);
141 simple_unlock(&dehash_slock);
142 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, p))
143 goto loop;
144 return (dep);
145 }
146 }
147 simple_unlock(&dehash_slock);
148 return (NULL);
149 }
150
151 static void
152 msdosfs_hashins(dep)
153 struct denode *dep;
154 {
155 struct denode **depp, *deq;
156
157 simple_lock(&dehash_slock);
158 depp = &DEHASH(dep->de_dev, dep->de_dirclust, dep->de_diroffset);
159 deq = *depp;
160 if (deq)
161 deq->de_prev = &dep->de_next;
162 dep->de_next = deq;
163 dep->de_prev = depp;
164 *depp = dep;
165 simple_unlock(&dehash_slock);
166 }
167
168 static void
169 msdosfs_hashrem(dep)
170 struct denode *dep;
171 {
172 struct denode *deq;
173
174 simple_lock(&dehash_slock);
175 deq = dep->de_next;
176 if (deq)
177 deq->de_prev = dep->de_prev;
178 *dep->de_prev = deq;
179 #ifdef DIAGNOSTIC
180 dep->de_next = NULL;
181 dep->de_prev = NULL;
182 #endif
183 simple_unlock(&dehash_slock);
184 }
185
186 /*
187 * If deget() succeeds it returns with the gotten denode locked().
188 *
189 * pmp - address of msdosfsmount structure of the filesystem containing
190 * the denode of interest. The pm_dev field and the address of
191 * the msdosfsmount structure are used.
192 * dirclust - which cluster bp contains, if dirclust is 0 (root directory)
193 * diroffset is relative to the beginning of the root directory,
194 * otherwise it is cluster relative.
195 * diroffset - offset past begin of cluster of denode we want
196 * depp - returns the address of the gotten denode.
197 */
198 int
199 deget(pmp, dirclust, diroffset, depp)
200 struct msdosfsmount *pmp; /* so we know the maj/min number */
201 u_long dirclust; /* cluster this dir entry came from */
202 u_long diroffset; /* index of entry within the cluster */
203 struct denode **depp; /* returns the addr of the gotten denode */
204 {
205 int error;
206 dev_t dev = pmp->pm_dev;
207 struct mount *mntp = pmp->pm_mountp;
208 struct direntry *direntptr;
209 struct denode *ldep;
210 struct vnode *nvp;
211 struct buf *bp;
212 struct proc *p = curproc; /* XXX */
213 struct timeval tv;
214
215 #ifdef MSDOSFS_DEBUG
216 printf("deget(pmp %p, dirclust %lu, diroffset %lx, depp %p)\n",
217 pmp, dirclust, diroffset, depp);
218 #endif
219
220 /*
221 * On FAT32 filesystems, root is a (more or less) normal
222 * directory
223 */
224 if (FAT32(pmp) && dirclust == MSDOSFSROOT)
225 dirclust = pmp->pm_rootdirblk;
226
227 /*
228 * See if the denode is in the denode cache. Use the location of
229 * the directory entry to compute the hash value. For subdir use
230 * address of "." entry. For root dir (if not FAT32) use cluster
231 * MSDOSFSROOT, offset MSDOSFSROOT_OFS
232 *
233 * NOTE: The check for de_refcnt > 0 below insures the denode being
234 * examined does not represent an unlinked but still open file.
235 * These files are not to be accessible even when the directory
236 * entry that represented the file happens to be reused while the
237 * deleted file is still open.
238 */
239 ldep = msdosfs_hashget(dev, dirclust, diroffset);
240 if (ldep) {
241 *depp = ldep;
242 return (0);
243 }
244
245 /*
246 * Do the MALLOC before the getnewvnode since doing so afterward
247 * might cause a bogus v_data pointer to get dereferenced
248 * elsewhere if MALLOC should block.
249 */
250 MALLOC(ldep, struct denode *, sizeof(struct denode), M_MSDOSFSNODE, M_WAITOK);
251
252 /*
253 * Directory entry was not in cache, have to create a vnode and
254 * copy it from the passed disk buffer.
255 */
256 /* getnewvnode() does a VREF() on the vnode */
257 error = getnewvnode(VT_MSDOSFS, mntp, msdosfs_vnodeop_p, &nvp);
258 if (error) {
259 *depp = NULL;
260 FREE(ldep, M_MSDOSFSNODE);
261 return error;
262 }
263 bzero((caddr_t)ldep, sizeof *ldep);
264 lockinit(&ldep->de_lock, PINOD, "denode", VLKTIMEOUT, 0);
265 nvp->v_data = ldep;
266 ldep->de_vnode = nvp;
267 ldep->de_flag = 0;
268 ldep->de_devvp = 0;
269 ldep->de_dev = dev;
270 ldep->de_dirclust = dirclust;
271 ldep->de_diroffset = diroffset;
272 fc_purge(ldep, 0); /* init the fat cache for this denode */
273
274 /*
275 * Lock the denode so that it can't be accessed until we've read
276 * it in and have done what we need to it. Do this here instead
277 * of at the start of msdosfs_hashins() so that reinsert() can
278 * call msdosfs_hashins() with a locked denode.
279 */
280 if (lockmgr(&ldep->de_lock, LK_EXCLUSIVE, (struct simplelock *)0, p))
281 panic("deget: unexpected lock failure");
282
283 /*
284 * Insert the denode into the hash queue.
285 */
286 msdosfs_hashins(ldep);
287
288 ldep->de_pmp = pmp;
289 ldep->de_refcnt = 1;
290 /*
291 * Copy the directory entry into the denode area of the vnode.
292 */
293 if ((dirclust == MSDOSFSROOT
294 || (FAT32(pmp) && dirclust == pmp->pm_rootdirblk))
295 && diroffset == MSDOSFSROOT_OFS) {
296 /*
297 * Directory entry for the root directory. There isn't one,
298 * so we manufacture one. We should probably rummage
299 * through the root directory and find a label entry (if it
300 * exists), and then use the time and date from that entry
301 * as the time and date for the root denode.
302 */
303 nvp->v_flag |= VROOT; /* should be further down XXX */
304
305 ldep->de_Attributes = ATTR_DIRECTORY;
306 ldep->de_LowerCase = 0;
307 if (FAT32(pmp))
308 ldep->de_StartCluster = pmp->pm_rootdirblk;
309 /* de_FileSize will be filled in further down */
310 else {
311 ldep->de_StartCluster = MSDOSFSROOT;
312 ldep->de_FileSize = pmp->pm_rootdirsize * DEV_BSIZE;
313 }
314 /*
315 * fill in time and date so that dos2unixtime() doesn't
316 * spit up when called from msdosfs_getattr() with root
317 * denode
318 */
319 ldep->de_CHun = 0;
320 ldep->de_CTime = 0x0000; /* 00:00:00 */
321 ldep->de_CDate = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT)
322 | (1 << DD_DAY_SHIFT);
323 /* Jan 1, 1980 */
324 ldep->de_ADate = ldep->de_CDate;
325 ldep->de_MTime = ldep->de_CTime;
326 ldep->de_MDate = ldep->de_CDate;
327 /* leave the other fields as garbage */
328 } else {
329 error = readep(pmp, dirclust, diroffset, &bp, &direntptr);
330 if (error) {
331 /*
332 * The denode does not contain anything useful, so
333 * it would be wrong to leave it on its hash chain.
334 * Arrange for vput() to just forget about it.
335 */
336 ldep->de_Name[0] = SLOT_DELETED;
337
338 vput(nvp);
339 *depp = NULL;
340 return (error);
341 }
342 DE_INTERNALIZE(ldep, direntptr);
343 brelse(bp);
344 }
345
346 /*
347 * Fill in a few fields of the vnode and finish filling in the
348 * denode. Then return the address of the found denode.
349 */
350 if (ldep->de_Attributes & ATTR_DIRECTORY) {
351 /*
352 * Since DOS directory entries that describe directories
353 * have 0 in the filesize field, we take this opportunity
354 * to find out the length of the directory and plug it into
355 * the denode structure.
356 */
357 u_long size;
358
359 /*
360 * XXX Sometimes, these arrives that . entry have cluster
361 * number 0, when it shouldn't. Use real cluster number
362 * instead of what is written in directory entry.
363 */
364 if ((diroffset == 0) && (ldep->de_StartCluster != dirclust)) {
365 printf("deget(): . entry at clust %ld != %ld\n",
366 dirclust, ldep->de_StartCluster);
367 ldep->de_StartCluster = dirclust;
368 }
369
370 nvp->v_type = VDIR;
371 if (ldep->de_StartCluster != MSDOSFSROOT) {
372 error = pcbmap(ldep, 0xffff, 0, &size, 0);
373 if (error == E2BIG) {
374 ldep->de_FileSize = de_cn2off(pmp, size);
375 error = 0;
376 } else
377 printf("deget(): pcbmap returned %d\n", error);
378 }
379 } else
380 nvp->v_type = VREG;
381 getmicrouptime(&tv);
382 SETHIGH(ldep->de_modrev, tv.tv_sec);
383 SETLOW(ldep->de_modrev, tv.tv_usec * 4294);
384 ldep->de_devvp = pmp->pm_devvp;
385 VREF(ldep->de_devvp);
386 *depp = ldep;
387 return (0);
388 }
389
390 int
391 deupdat(dep, waitfor)
392 struct denode *dep;
393 int waitfor;
394 {
395 int error;
396 struct buf *bp;
397 struct direntry *dirp;
398 struct timespec ts;
399
400 if (DETOV(dep)->v_mount->mnt_flag & MNT_RDONLY)
401 return (0);
402 getnanotime(&ts);
403 DETIMES(dep, &ts, &ts, &ts);
404 if ((dep->de_flag & DE_MODIFIED) == 0)
405 return (0);
406 dep->de_flag &= ~DE_MODIFIED;
407 if (dep->de_Attributes & ATTR_DIRECTORY)
408 return (0);
409 if (dep->de_refcnt <= 0)
410 return (0);
411 error = readde(dep, &bp, &dirp);
412 if (error)
413 return (error);
414 DE_EXTERNALIZE(dirp, dep);
415 if (waitfor)
416 return (bwrite(bp));
417 else {
418 bdwrite(bp);
419 return (0);
420 }
421 }
422
423 /*
424 * Truncate the file described by dep to the length specified by length.
425 */
426 int
427 detrunc(dep, length, flags, cred, p)
428 struct denode *dep;
429 u_long length;
430 int flags;
431 struct ucred *cred;
432 struct proc *p;
433 {
434 int error;
435 int allerror;
436 u_long eofentry;
437 u_long chaintofree;
438 daddr_t bn;
439 int boff;
440 int isadir = dep->de_Attributes & ATTR_DIRECTORY;
441 struct buf *bp;
442 struct msdosfsmount *pmp = dep->de_pmp;
443
444 #ifdef MSDOSFS_DEBUG
445 printf("detrunc(): file %s, length %lu, flags %x\n", dep->de_Name, length, flags);
446 #endif
447
448 /*
449 * Disallow attempts to truncate the root directory since it is of
450 * fixed size. That's just the way dos filesystems are. We use
451 * the VROOT bit in the vnode because checking for the directory
452 * bit and a startcluster of 0 in the denode is not adequate to
453 * recognize the root directory at this point in a file or
454 * directory's life.
455 */
456 if ((DETOV(dep)->v_flag & VROOT) && !FAT32(pmp)) {
457 printf("detrunc(): can't truncate root directory, clust %ld, offset %ld\n",
458 dep->de_dirclust, dep->de_diroffset);
459 return (EINVAL);
460 }
461
462
463 if (dep->de_FileSize < length) {
464 vnode_pager_setsize(DETOV(dep), length);
465 return deextend(dep, length, cred);
466 }
467
468 /*
469 * If the desired length is 0 then remember the starting cluster of
470 * the file and set the StartCluster field in the directory entry
471 * to 0. If the desired length is not zero, then get the number of
472 * the last cluster in the shortened file. Then get the number of
473 * the first cluster in the part of the file that is to be freed.
474 * Then set the next cluster pointer in the last cluster of the
475 * file to CLUST_EOFE.
476 */
477 if (length == 0) {
478 chaintofree = dep->de_StartCluster;
479 dep->de_StartCluster = 0;
480 eofentry = ~0;
481 } else {
482 error = pcbmap(dep, de_clcount(pmp, length) - 1, 0,
483 &eofentry, 0);
484 if (error) {
485 #ifdef MSDOSFS_DEBUG
486 printf("detrunc(): pcbmap fails %d\n", error);
487 #endif
488 return (error);
489 }
490 }
491
492 fc_purge(dep, de_clcount(pmp, length));
493
494 /*
495 * If the new length is not a multiple of the cluster size then we
496 * must zero the tail end of the new last cluster in case it
497 * becomes part of the file again because of a seek.
498 */
499 if ((boff = length & pmp->pm_crbomask) != 0) {
500 if (isadir) {
501 bn = cntobn(pmp, eofentry);
502 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster,
503 NOCRED, &bp);
504 if (error) {
505 brelse(bp);
506 #ifdef MSDOSFS_DEBUG
507 printf("detrunc(): bread fails %d\n", error);
508 #endif
509 return (error);
510 }
511 bzero(bp->b_data + boff, pmp->pm_bpcluster - boff);
512 if (flags & IO_SYNC)
513 bwrite(bp);
514 else
515 bdwrite(bp);
516 }
517 }
518
519 /*
520 * Write out the updated directory entry. Even if the update fails
521 * we free the trailing clusters.
522 */
523 dep->de_FileSize = length;
524 if (!isadir)
525 dep->de_flag |= DE_UPDATE|DE_MODIFIED;
526 allerror = vtruncbuf(DETOV(dep), cred, p, length, pmp->pm_bpcluster);
527 #ifdef MSDOSFS_DEBUG
528 if (allerror)
529 printf("detrunc(): vtruncbuf error %d\n", allerror);
530 #endif
531 error = deupdat(dep, 1);
532 if (error && (allerror == 0))
533 allerror = error;
534 #ifdef MSDOSFS_DEBUG
535 printf("detrunc(): allerror %d, eofentry %lu\n",
536 allerror, eofentry);
537 #endif
538
539 /*
540 * If we need to break the cluster chain for the file then do it
541 * now.
542 */
543 if (eofentry != ~0) {
544 error = fatentry(FAT_GET_AND_SET, pmp, eofentry,
545 &chaintofree, CLUST_EOFE);
546 if (error) {
547 #ifdef MSDOSFS_DEBUG
548 printf("detrunc(): fatentry errors %d\n", error);
549 #endif
550 return (error);
551 }
552 fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1),
553 eofentry);
554 }
555
556 /*
557 * Now free the clusters removed from the file because of the
558 * truncation.
559 */
560 if (chaintofree != 0 && !MSDOSFSEOF(pmp, chaintofree))
561 freeclusterchain(pmp, chaintofree);
562
563 return (allerror);
564 }
565
566 /*
567 * Extend the file described by dep to length specified by length.
568 */
569 int
570 deextend(dep, length, cred)
571 struct denode *dep;
572 u_long length;
573 struct ucred *cred;
574 {
575 struct msdosfsmount *pmp = dep->de_pmp;
576 u_long count;
577 int error;
578
579 /*
580 * The root of a DOS filesystem cannot be extended.
581 */
582 if ((DETOV(dep)->v_flag & VROOT) && !FAT32(pmp))
583 return (EINVAL);
584
585 /*
586 * Directories cannot be extended.
587 */
588 if (dep->de_Attributes & ATTR_DIRECTORY)
589 return (EISDIR);
590
591 if (length <= dep->de_FileSize)
592 panic("deextend: file too large");
593
594 /*
595 * Compute the number of clusters to allocate.
596 */
597 count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize);
598 if (count > 0) {
599 if (count > pmp->pm_freeclustercount)
600 return (ENOSPC);
601 error = extendfile(dep, count, NULL, NULL, DE_CLEAR);
602 if (error) {
603 /* truncate the added clusters away again */
604 (void) detrunc(dep, dep->de_FileSize, 0, cred, NULL);
605 return (error);
606 }
607 }
608 dep->de_FileSize = length;
609 dep->de_flag |= DE_UPDATE|DE_MODIFIED;
610 return (deupdat(dep, 1));
611 }
612
613 /*
614 * Move a denode to its correct hash queue after the file it represents has
615 * been moved to a new directory.
616 */
617 void
618 reinsert(dep)
619 struct denode *dep;
620 {
621 /*
622 * Fix up the denode cache. If the denode is for a directory,
623 * there is nothing to do since the hash is based on the starting
624 * cluster of the directory file and that hasn't changed. If for a
625 * file the hash is based on the location of the directory entry,
626 * so we must remove it from the cache and re-enter it with the
627 * hash based on the new location of the directory entry.
628 */
629 if (dep->de_Attributes & ATTR_DIRECTORY)
630 return;
631 msdosfs_hashrem(dep);
632 msdosfs_hashins(dep);
633 }
634
635 int
636 msdosfs_reclaim(ap)
637 struct vop_reclaim_args /* {
638 struct vnode *a_vp;
639 } */ *ap;
640 {
641 struct vnode *vp = ap->a_vp;
642 struct denode *dep = VTODE(vp);
643
644 #ifdef MSDOSFS_DEBUG
645 printf("msdosfs_reclaim(): dep %p, file %s, refcnt %ld\n",
646 dep, dep->de_Name, dep->de_refcnt);
647 #endif
648
649 if (prtactive && vp->v_usecount != 0)
650 vprint("msdosfs_reclaim(): pushing active", vp);
651 /*
652 * Remove the denode from its hash chain.
653 */
654 msdosfs_hashrem(dep);
655 /*
656 * Purge old data structures associated with the denode.
657 */
658 cache_purge(vp);
659 if (dep->de_devvp) {
660 vrele(dep->de_devvp);
661 dep->de_devvp = 0;
662 }
663 #if 0 /* XXX */
664 dep->de_flag = 0;
665 #endif
666 FREE(dep, M_MSDOSFSNODE);
667 vp->v_data = NULL;
668
669 return (0);
670 }
671
672 int
673 msdosfs_inactive(ap)
674 struct vop_inactive_args /* {
675 struct vnode *a_vp;
676 struct proc *a_p;
677 } */ *ap;
678 {
679 struct vnode *vp = ap->a_vp;
680 struct denode *dep = VTODE(vp);
681 struct proc *p = ap->a_p;
682 int error = 0;
683
684 #ifdef MSDOSFS_DEBUG
685 printf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep, dep->de_Name[0]);
686 #endif
687
688 if (prtactive && vp->v_usecount != 0)
689 vprint("msdosfs_inactive(): pushing active", vp);
690
691 /*
692 * Ignore denodes related to stale file handles.
693 */
694 if (dep->de_Name[0] == SLOT_DELETED)
695 goto out;
696
697 /*
698 * If the file has been deleted and it is on a read/write
699 * filesystem, then truncate the file, and mark the directory slot
700 * as empty. (This may not be necessary for the dos filesystem.)
701 */
702 #ifdef MSDOSFS_DEBUG
703 printf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %x, MNT_RDONLY %x\n",
704 dep, dep->de_refcnt, vp->v_mount->mnt_flag, MNT_RDONLY);
705 #endif
706 if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
707 error = detrunc(dep, (u_long) 0, 0, NOCRED, p);
708 dep->de_flag |= DE_UPDATE;
709 dep->de_Name[0] = SLOT_DELETED;
710 }
711 deupdat(dep, 0);
712
713 out:
714 VOP_UNLOCK(vp, 0, p);
715 /*
716 * If we are done with the denode, reclaim it
717 * so that it can be reused immediately.
718 */
719 #ifdef MSDOSFS_DEBUG
720 printf("msdosfs_inactive(): v_usecount %d, de_Name[0] %x\n", vp->v_usecount,
721 dep->de_Name[0]);
722 #endif
723 if (dep->de_Name[0] == SLOT_DELETED)
724 vrecycle(vp, (struct simplelock *)0, p);
725 return (error);
726 }
Cache object: 35a5632666e20ccd69f6c734da500585
|