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/bio.h>
57 #include <sys/buf.h>
58 #include <sys/vnode.h>
59 #include <sys/mutex.h>
60
61 #include <vm/vm.h>
62 #include <vm/vm_extern.h>
63
64 #include <fs/msdosfs/bpb.h>
65 #include <fs/msdosfs/msdosfsmount.h>
66 #include <fs/msdosfs/direntry.h>
67 #include <fs/msdosfs/denode.h>
68 #include <fs/msdosfs/fat.h>
69
70 static MALLOC_DEFINE(M_MSDOSFSNODE, "MSDOSFS node", "MSDOSFS vnode private part");
71
72 static struct denode **dehashtbl;
73 static u_long dehash; /* size of hash table - 1 */
74 #define DEHASH(dev, dcl, doff) (dehashtbl[(minor(dev) + (dcl) + (doff) / \
75 sizeof(struct direntry)) & dehash])
76 static struct mtx dehash_mtx;
77 static int dehash_init;
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(struct cdev *dev, u_long dirclust, u_long diroff);
98 static void msdosfs_hashins(struct denode *dep);
99 static void msdosfs_hashrem(struct denode *dep);
100
101 /*ARGSUSED*/
102 int
103 msdosfs_init(vfsp)
104 struct vfsconf *vfsp;
105 {
106 /*
107 * The following lines prevent us from initializing the mutex
108 * init multiple times. I'm not sure why we get called multiple
109 * times, but the following prevents the panic when we initalize
110 * the mutext the second time. XXX BAD XXX
111 */
112 if (dehash_init) {
113 printf("Warning: msdosfs_init called more than once!\n");
114 return (0);
115 }
116 dehash_init++;
117 dehashtbl = hashinit(desiredvnodes/2, M_MSDOSFSMNT, &dehash);
118 mtx_init(&dehash_mtx, "msdosfs dehash", NULL, MTX_DEF);
119 return (0);
120 }
121
122 int
123 msdosfs_uninit(vfsp)
124 struct vfsconf *vfsp;
125 {
126
127 if (dehashtbl)
128 free(dehashtbl, M_MSDOSFSMNT);
129 mtx_destroy(&dehash_mtx);
130 dehash_init--;
131 return (0);
132 }
133
134 static struct denode *
135 msdosfs_hashget(dev, dirclust, diroff)
136 struct cdev *dev;
137 u_long dirclust;
138 u_long diroff;
139 {
140 struct thread *td = curthread; /* XXX */
141 struct denode *dep;
142 struct vnode *vp;
143
144 loop:
145 mtx_lock(&dehash_mtx);
146 for (dep = DEHASH(dev, dirclust, diroff); dep; dep = dep->de_next) {
147 if (dirclust == dep->de_dirclust
148 && diroff == dep->de_diroffset
149 && dev == dep->de_dev
150 && dep->de_refcnt != 0) {
151 vp = DETOV(dep);
152 mtx_lock(&vp->v_interlock);
153 mtx_unlock(&dehash_mtx);
154 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td))
155 goto loop;
156 return (dep);
157 }
158 }
159 mtx_unlock(&dehash_mtx);
160 return (NULL);
161 }
162
163 static void
164 msdosfs_hashins(dep)
165 struct denode *dep;
166 {
167 struct denode **depp, *deq;
168
169 mtx_lock(&dehash_mtx);
170 depp = &DEHASH(dep->de_dev, dep->de_dirclust, dep->de_diroffset);
171 deq = *depp;
172 if (deq)
173 deq->de_prev = &dep->de_next;
174 dep->de_next = deq;
175 dep->de_prev = depp;
176 *depp = dep;
177 mtx_unlock(&dehash_mtx);
178 }
179
180 static void
181 msdosfs_hashrem(dep)
182 struct denode *dep;
183 {
184 struct denode *deq;
185
186 mtx_lock(&dehash_mtx);
187 deq = dep->de_next;
188 if (deq)
189 deq->de_prev = dep->de_prev;
190 *dep->de_prev = deq;
191 #ifdef DIAGNOSTIC
192 dep->de_next = NULL;
193 dep->de_prev = NULL;
194 #endif
195 mtx_unlock(&dehash_mtx);
196 }
197
198 /*
199 * If deget() succeeds it returns with the gotten denode locked().
200 *
201 * pmp - address of msdosfsmount structure of the filesystem containing
202 * the denode of interest. The pm_dev field and the address of
203 * the msdosfsmount structure are used.
204 * dirclust - which cluster bp contains, if dirclust is 0 (root directory)
205 * diroffset is relative to the beginning of the root directory,
206 * otherwise it is cluster relative.
207 * diroffset - offset past begin of cluster of denode we want
208 * depp - returns the address of the gotten denode.
209 */
210 int
211 deget(pmp, dirclust, diroffset, depp)
212 struct msdosfsmount *pmp; /* so we know the maj/min number */
213 u_long dirclust; /* cluster this dir entry came from */
214 u_long diroffset; /* index of entry within the cluster */
215 struct denode **depp; /* returns the addr of the gotten denode */
216 {
217 int error;
218 struct cdev *dev = pmp->pm_dev;
219 struct mount *mntp = pmp->pm_mountp;
220 struct direntry *direntptr;
221 struct denode *ldep;
222 struct vnode *nvp;
223 struct buf *bp;
224 struct thread *td = curthread; /* XXX */
225 struct timeval tv;
226
227 #ifdef MSDOSFS_DEBUG
228 printf("deget(pmp %p, dirclust %lu, diroffset %lx, depp %p)\n",
229 pmp, dirclust, diroffset, depp);
230 #endif
231
232 /*
233 * On FAT32 filesystems, root is a (more or less) normal
234 * directory
235 */
236 if (FAT32(pmp) && dirclust == MSDOSFSROOT)
237 dirclust = pmp->pm_rootdirblk;
238
239 /*
240 * See if the denode is in the denode cache. Use the location of
241 * the directory entry to compute the hash value. For subdir use
242 * address of "." entry. For root dir (if not FAT32) use cluster
243 * MSDOSFSROOT, offset MSDOSFSROOT_OFS
244 *
245 * NOTE: The check for de_refcnt > 0 below insures the denode being
246 * examined does not represent an unlinked but still open file.
247 * These files are not to be accessible even when the directory
248 * entry that represented the file happens to be reused while the
249 * deleted file is still open.
250 */
251 ldep = msdosfs_hashget(dev, dirclust, diroffset);
252 if (ldep) {
253 *depp = ldep;
254 return (0);
255 }
256
257 /*
258 * Do the MALLOC before the getnewvnode since doing so afterward
259 * might cause a bogus v_data pointer to get dereferenced
260 * elsewhere if MALLOC should block.
261 */
262 MALLOC(ldep, struct denode *, sizeof(struct denode), M_MSDOSFSNODE, M_WAITOK);
263
264 /*
265 * Directory entry was not in cache, have to create a vnode and
266 * copy it from the passed disk buffer.
267 */
268 /* getnewvnode() does a VREF() on the vnode */
269 error = getnewvnode("msdosfs", mntp, msdosfs_vnodeop_p, &nvp);
270 if (error) {
271 *depp = NULL;
272 FREE(ldep, M_MSDOSFSNODE);
273 return error;
274 }
275 bzero((caddr_t)ldep, sizeof *ldep);
276 nvp->v_data = ldep;
277 ldep->de_vnode = nvp;
278 ldep->de_flag = 0;
279 ldep->de_devvp = 0;
280 ldep->de_dev = dev;
281 ldep->de_dirclust = dirclust;
282 ldep->de_diroffset = diroffset;
283 fc_purge(ldep, 0); /* init the fat cache for this denode */
284
285 /*
286 * Lock the denode so that it can't be accessed until we've read
287 * it in and have done what we need to it. Do this here instead
288 * of at the start of msdosfs_hashins() so that reinsert() can
289 * call msdosfs_hashins() with a locked denode.
290 */
291 if (VOP_LOCK(nvp, LK_EXCLUSIVE, td) != 0)
292 panic("deget: unexpected lock failure");
293
294 /*
295 * Insert the denode into the hash queue.
296 */
297 msdosfs_hashins(ldep);
298
299 ldep->de_pmp = pmp;
300 ldep->de_refcnt = 1;
301 /*
302 * Copy the directory entry into the denode area of the vnode.
303 */
304 if ((dirclust == MSDOSFSROOT
305 || (FAT32(pmp) && dirclust == pmp->pm_rootdirblk))
306 && diroffset == MSDOSFSROOT_OFS) {
307 /*
308 * Directory entry for the root directory. There isn't one,
309 * so we manufacture one. We should probably rummage
310 * through the root directory and find a label entry (if it
311 * exists), and then use the time and date from that entry
312 * as the time and date for the root denode.
313 */
314 nvp->v_vflag |= VV_ROOT; /* should be further down XXX */
315
316 ldep->de_Attributes = ATTR_DIRECTORY;
317 ldep->de_LowerCase = 0;
318 if (FAT32(pmp))
319 ldep->de_StartCluster = pmp->pm_rootdirblk;
320 /* de_FileSize will be filled in further down */
321 else {
322 ldep->de_StartCluster = MSDOSFSROOT;
323 ldep->de_FileSize = pmp->pm_rootdirsize * DEV_BSIZE;
324 }
325 /*
326 * fill in time and date so that dos2unixtime() doesn't
327 * spit up when called from msdosfs_getattr() with root
328 * denode
329 */
330 ldep->de_CHun = 0;
331 ldep->de_CTime = 0x0000; /* 00:00:00 */
332 ldep->de_CDate = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT)
333 | (1 << DD_DAY_SHIFT);
334 /* Jan 1, 1980 */
335 ldep->de_ADate = ldep->de_CDate;
336 ldep->de_MTime = ldep->de_CTime;
337 ldep->de_MDate = ldep->de_CDate;
338 /* leave the other fields as garbage */
339 } else {
340 error = readep(pmp, dirclust, diroffset, &bp, &direntptr);
341 if (error) {
342 /*
343 * The denode does not contain anything useful, so
344 * it would be wrong to leave it on its hash chain.
345 * Arrange for vput() to just forget about it.
346 */
347 ldep->de_Name[0] = SLOT_DELETED;
348
349 vput(nvp);
350 *depp = NULL;
351 return (error);
352 }
353 DE_INTERNALIZE(ldep, direntptr);
354 brelse(bp);
355 }
356
357 /*
358 * Fill in a few fields of the vnode and finish filling in the
359 * denode. Then return the address of the found denode.
360 */
361 if (ldep->de_Attributes & ATTR_DIRECTORY) {
362 /*
363 * Since DOS directory entries that describe directories
364 * have 0 in the filesize field, we take this opportunity
365 * to find out the length of the directory and plug it into
366 * the denode structure.
367 */
368 u_long size;
369
370 /*
371 * XXX Sometimes, these arrives that . entry have cluster
372 * number 0, when it shouldn't. Use real cluster number
373 * instead of what is written in directory entry.
374 */
375 if ((diroffset == 0) && (ldep->de_StartCluster != dirclust)) {
376 printf("deget(): . entry at clust %ld != %ld\n",
377 dirclust, ldep->de_StartCluster);
378 ldep->de_StartCluster = dirclust;
379 }
380
381 nvp->v_type = VDIR;
382 if (ldep->de_StartCluster != MSDOSFSROOT) {
383 error = pcbmap(ldep, 0xffff, 0, &size, 0);
384 if (error == E2BIG) {
385 ldep->de_FileSize = de_cn2off(pmp, size);
386 error = 0;
387 } else
388 printf("deget(): pcbmap returned %d\n", error);
389 }
390 } else
391 nvp->v_type = VREG;
392 getmicrouptime(&tv);
393 SETHIGH(ldep->de_modrev, tv.tv_sec);
394 SETLOW(ldep->de_modrev, tv.tv_usec * 4294);
395 ldep->de_devvp = pmp->pm_devvp;
396 VREF(ldep->de_devvp);
397 *depp = ldep;
398 return (0);
399 }
400
401 int
402 deupdat(dep, waitfor)
403 struct denode *dep;
404 int waitfor;
405 {
406 int error;
407 struct buf *bp;
408 struct direntry *dirp;
409 struct timespec ts;
410
411 if (DETOV(dep)->v_mount->mnt_flag & MNT_RDONLY)
412 return (0);
413 getnanotime(&ts);
414 DETIMES(dep, &ts, &ts, &ts);
415 if ((dep->de_flag & DE_MODIFIED) == 0)
416 return (0);
417 dep->de_flag &= ~DE_MODIFIED;
418 if (dep->de_Attributes & ATTR_DIRECTORY)
419 return (0);
420 if (dep->de_refcnt <= 0)
421 return (0);
422 error = readde(dep, &bp, &dirp);
423 if (error)
424 return (error);
425 DE_EXTERNALIZE(dirp, dep);
426 if (waitfor)
427 return (bwrite(bp));
428 else {
429 bdwrite(bp);
430 return (0);
431 }
432 }
433
434 /*
435 * Truncate the file described by dep to the length specified by length.
436 */
437 int
438 detrunc(dep, length, flags, cred, td)
439 struct denode *dep;
440 u_long length;
441 int flags;
442 struct ucred *cred;
443 struct thread *td;
444 {
445 int error;
446 int allerror;
447 u_long eofentry;
448 u_long chaintofree;
449 daddr_t bn;
450 int boff;
451 int isadir = dep->de_Attributes & ATTR_DIRECTORY;
452 struct buf *bp;
453 struct msdosfsmount *pmp = dep->de_pmp;
454
455 #ifdef MSDOSFS_DEBUG
456 printf("detrunc(): file %s, length %lu, flags %x\n", dep->de_Name, length, flags);
457 #endif
458
459 /*
460 * Disallow attempts to truncate the root directory since it is of
461 * fixed size. That's just the way dos filesystems are. We use
462 * the VROOT bit in the vnode because checking for the directory
463 * bit and a startcluster of 0 in the denode is not adequate to
464 * recognize the root directory at this point in a file or
465 * directory's life.
466 */
467 if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp)) {
468 printf("detrunc(): can't truncate root directory, clust %ld, offset %ld\n",
469 dep->de_dirclust, dep->de_diroffset);
470 return (EINVAL);
471 }
472
473
474 if (dep->de_FileSize < length) {
475 vnode_pager_setsize(DETOV(dep), length);
476 return deextend(dep, length, cred);
477 }
478
479 /*
480 * If the desired length is 0 then remember the starting cluster of
481 * the file and set the StartCluster field in the directory entry
482 * to 0. If the desired length is not zero, then get the number of
483 * the last cluster in the shortened file. Then get the number of
484 * the first cluster in the part of the file that is to be freed.
485 * Then set the next cluster pointer in the last cluster of the
486 * file to CLUST_EOFE.
487 */
488 if (length == 0) {
489 chaintofree = dep->de_StartCluster;
490 dep->de_StartCluster = 0;
491 eofentry = ~0;
492 } else {
493 error = pcbmap(dep, de_clcount(pmp, length) - 1, 0,
494 &eofentry, 0);
495 if (error) {
496 #ifdef MSDOSFS_DEBUG
497 printf("detrunc(): pcbmap fails %d\n", error);
498 #endif
499 return (error);
500 }
501 }
502
503 fc_purge(dep, de_clcount(pmp, length));
504
505 /*
506 * If the new length is not a multiple of the cluster size then we
507 * must zero the tail end of the new last cluster in case it
508 * becomes part of the file again because of a seek.
509 */
510 if ((boff = length & pmp->pm_crbomask) != 0) {
511 if (isadir) {
512 bn = cntobn(pmp, eofentry);
513 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster,
514 NOCRED, &bp);
515 if (error) {
516 brelse(bp);
517 #ifdef MSDOSFS_DEBUG
518 printf("detrunc(): bread fails %d\n", error);
519 #endif
520 return (error);
521 }
522 bzero(bp->b_data + boff, pmp->pm_bpcluster - boff);
523 if (flags & IO_SYNC)
524 bwrite(bp);
525 else
526 bdwrite(bp);
527 }
528 }
529
530 /*
531 * Write out the updated directory entry. Even if the update fails
532 * we free the trailing clusters.
533 */
534 dep->de_FileSize = length;
535 if (!isadir)
536 dep->de_flag |= DE_UPDATE|DE_MODIFIED;
537 allerror = vtruncbuf(DETOV(dep), cred, td, length, pmp->pm_bpcluster);
538 #ifdef MSDOSFS_DEBUG
539 if (allerror)
540 printf("detrunc(): vtruncbuf error %d\n", allerror);
541 #endif
542 error = deupdat(dep, 1);
543 if (error && (allerror == 0))
544 allerror = error;
545 #ifdef MSDOSFS_DEBUG
546 printf("detrunc(): allerror %d, eofentry %lu\n",
547 allerror, eofentry);
548 #endif
549
550 /*
551 * If we need to break the cluster chain for the file then do it
552 * now.
553 */
554 if (eofentry != ~0) {
555 error = fatentry(FAT_GET_AND_SET, pmp, eofentry,
556 &chaintofree, CLUST_EOFE);
557 if (error) {
558 #ifdef MSDOSFS_DEBUG
559 printf("detrunc(): fatentry errors %d\n", error);
560 #endif
561 return (error);
562 }
563 fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1),
564 eofentry);
565 }
566
567 /*
568 * Now free the clusters removed from the file because of the
569 * truncation.
570 */
571 if (chaintofree != 0 && !MSDOSFSEOF(pmp, chaintofree))
572 freeclusterchain(pmp, chaintofree);
573
574 return (allerror);
575 }
576
577 /*
578 * Extend the file described by dep to length specified by length.
579 */
580 int
581 deextend(dep, length, cred)
582 struct denode *dep;
583 u_long length;
584 struct ucred *cred;
585 {
586 struct msdosfsmount *pmp = dep->de_pmp;
587 u_long count;
588 int error;
589
590 /*
591 * The root of a DOS filesystem cannot be extended.
592 */
593 if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp))
594 return (EINVAL);
595
596 /*
597 * Directories cannot be extended.
598 */
599 if (dep->de_Attributes & ATTR_DIRECTORY)
600 return (EISDIR);
601
602 if (length <= dep->de_FileSize)
603 panic("deextend: file too large");
604
605 /*
606 * Compute the number of clusters to allocate.
607 */
608 count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize);
609 if (count > 0) {
610 if (count > pmp->pm_freeclustercount)
611 return (ENOSPC);
612 error = extendfile(dep, count, NULL, NULL, DE_CLEAR);
613 if (error) {
614 /* truncate the added clusters away again */
615 (void) detrunc(dep, dep->de_FileSize, 0, cred, NULL);
616 return (error);
617 }
618 }
619 dep->de_FileSize = length;
620 dep->de_flag |= DE_UPDATE|DE_MODIFIED;
621 return (deupdat(dep, 1));
622 }
623
624 /*
625 * Move a denode to its correct hash queue after the file it represents has
626 * been moved to a new directory.
627 */
628 void
629 reinsert(dep)
630 struct denode *dep;
631 {
632 /*
633 * Fix up the denode cache. If the denode is for a directory,
634 * there is nothing to do since the hash is based on the starting
635 * cluster of the directory file and that hasn't changed. If for a
636 * file the hash is based on the location of the directory entry,
637 * so we must remove it from the cache and re-enter it with the
638 * hash based on the new location of the directory entry.
639 */
640 if (dep->de_Attributes & ATTR_DIRECTORY)
641 return;
642 msdosfs_hashrem(dep);
643 msdosfs_hashins(dep);
644 }
645
646 int
647 msdosfs_reclaim(ap)
648 struct vop_reclaim_args /* {
649 struct vnode *a_vp;
650 } */ *ap;
651 {
652 struct vnode *vp = ap->a_vp;
653 struct denode *dep = VTODE(vp);
654
655 #ifdef MSDOSFS_DEBUG
656 printf("msdosfs_reclaim(): dep %p, file %s, refcnt %ld\n",
657 dep, dep->de_Name, dep->de_refcnt);
658 #endif
659
660 if (prtactive && vrefcnt(vp) != 0)
661 vprint("msdosfs_reclaim(): pushing active", vp);
662 /*
663 * Remove the denode from its hash chain.
664 */
665 msdosfs_hashrem(dep);
666 /*
667 * Purge old data structures associated with the denode.
668 */
669 if (dep->de_devvp) {
670 vrele(dep->de_devvp);
671 dep->de_devvp = 0;
672 }
673 #if 0 /* XXX */
674 dep->de_flag = 0;
675 #endif
676 FREE(dep, M_MSDOSFSNODE);
677 vp->v_data = NULL;
678
679 return (0);
680 }
681
682 int
683 msdosfs_inactive(ap)
684 struct vop_inactive_args /* {
685 struct vnode *a_vp;
686 struct thread *a_td;
687 } */ *ap;
688 {
689 struct vnode *vp = ap->a_vp;
690 struct denode *dep = VTODE(vp);
691 struct thread *td = ap->a_td;
692 int error = 0;
693
694 #ifdef MSDOSFS_DEBUG
695 printf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep, dep->de_Name[0]);
696 #endif
697
698 if (prtactive && vrefcnt(vp) != 0)
699 vprint("msdosfs_inactive(): pushing active", vp);
700
701 /*
702 * Ignore denodes related to stale file handles.
703 */
704 if (dep->de_Name[0] == SLOT_DELETED)
705 goto out;
706
707 /*
708 * If the file has been deleted and it is on a read/write
709 * filesystem, then truncate the file, and mark the directory slot
710 * as empty. (This may not be necessary for the dos filesystem.)
711 */
712 #ifdef MSDOSFS_DEBUG
713 printf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %x, MNT_RDONLY %x\n",
714 dep, dep->de_refcnt, vp->v_mount->mnt_flag, MNT_RDONLY);
715 #endif
716 if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
717 error = detrunc(dep, (u_long) 0, 0, NOCRED, td);
718 dep->de_flag |= DE_UPDATE;
719 dep->de_Name[0] = SLOT_DELETED;
720 }
721 deupdat(dep, 0);
722
723 out:
724 VOP_UNLOCK(vp, 0, td);
725 /*
726 * If we are done with the denode, reclaim it
727 * so that it can be reused immediately.
728 */
729 #ifdef MSDOSFS_DEBUG
730 printf("msdosfs_inactive(): v_usecount %d, de_Name[0] %x\n",
731 vrefcnt(vp), dep->de_Name[0]);
732 #endif
733 if (dep->de_Name[0] == SLOT_DELETED)
734 vrecycle(vp, NULL, td);
735 return (error);
736 }
Cache object: 1e725fd5bc83c1366528c727d605bf4a
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