proc->thread stage 4: rework the VFS and DEVICE subsystems to take thread
[dragonfly.git] / sys / vfs / msdosfs / msdosfs_denode.c
CommitLineData
984263bc 1/* $FreeBSD: src/sys/msdosfs/msdosfs_denode.c,v 1.47.2.3 2002/08/22 16:20:15 trhodes Exp $ */
dadab5e9 2/* $DragonFly: src/sys/vfs/msdosfs/msdosfs_denode.c,v 1.3 2003/06/25 03:56:01 dillon Exp $ */
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3/* $NetBSD: msdosfs_denode.c,v 1.28 1998/02/10 14:10:00 mrg Exp $ */
4
5/*-
6 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
7 * Copyright (C) 1994, 1995, 1997 TooLs GmbH.
8 * All rights reserved.
9 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by TooLs GmbH.
22 * 4. The name of TooLs GmbH may not be used to endorse or promote products
23 * derived from this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
26 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
27 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
28 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
29 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
30 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
31 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
32 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
33 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
34 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 */
36/*
37 * Written by Paul Popelka (paulp@uts.amdahl.com)
38 *
39 * You can do anything you want with this software, just don't say you wrote
40 * it, and don't remove this notice.
41 *
42 * This software is provided "as is".
43 *
44 * The author supplies this software to be publicly redistributed on the
45 * understanding that the author is not responsible for the correct
46 * functioning of this software in any circumstances and is not liable for
47 * any damages caused by this software.
48 *
49 * October 1992
50 */
51
52#include <sys/param.h>
53#include <sys/systm.h>
54#include <sys/kernel.h>
55#include <sys/mount.h>
56#include <sys/malloc.h>
57#include <sys/proc.h>
58#include <sys/buf.h>
59#include <sys/vnode.h>
60
61#include <vm/vm.h>
62#include <vm/vm_extern.h>
63
64#include <msdosfs/bpb.h>
65#include <msdosfs/msdosfsmount.h>
66#include <msdosfs/direntry.h>
67#include <msdosfs/denode.h>
68#include <msdosfs/fat.h>
69
70static MALLOC_DEFINE(M_MSDOSFSNODE, "MSDOSFS node", "MSDOSFS vnode private part");
71
72static struct denode **dehashtbl;
73static 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#ifndef NULL_SIMPLELOCKS
77static struct simplelock dehash_slock;
78#endif
79
80union _qcvt {
81 quad_t qcvt;
82 long val[2];
83};
84#define SETHIGH(q, h) { \
85 union _qcvt tmp; \
86 tmp.qcvt = (q); \
87 tmp.val[_QUAD_HIGHWORD] = (h); \
88 (q) = tmp.qcvt; \
89}
90#define SETLOW(q, l) { \
91 union _qcvt tmp; \
92 tmp.qcvt = (q); \
93 tmp.val[_QUAD_LOWWORD] = (l); \
94 (q) = tmp.qcvt; \
95}
96
97static struct denode *
98 msdosfs_hashget __P((dev_t dev, u_long dirclust,
99 u_long diroff));
100static void msdosfs_hashins __P((struct denode *dep));
101static void msdosfs_hashrem __P((struct denode *dep));
102
103/*ARGSUSED*/
104int
105msdosfs_init(vfsp)
106 struct vfsconf *vfsp;
107{
108 dehashtbl = hashinit(desiredvnodes/2, M_MSDOSFSMNT, &dehash);
109 simple_lock_init(&dehash_slock);
110 return (0);
111}
112
113int
114msdosfs_uninit(vfsp)
115 struct vfsconf *vfsp;
116{
117
118 if (dehashtbl)
119 free(dehashtbl, M_MSDOSFSMNT);
120 return (0);
121}
122
123static struct denode *
124msdosfs_hashget(dev, dirclust, diroff)
125 dev_t dev;
126 u_long dirclust;
127 u_long diroff;
128{
dadab5e9 129 struct thread *td = curthread; /* XXX */
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130 struct denode *dep;
131 struct vnode *vp;
132
133loop:
134 simple_lock(&dehash_slock);
135 for (dep = DEHASH(dev, dirclust, diroff); dep; dep = dep->de_next) {
136 if (dirclust == dep->de_dirclust
137 && diroff == dep->de_diroffset
138 && dev == dep->de_dev
139 && dep->de_refcnt != 0) {
140 vp = DETOV(dep);
141 simple_lock(&vp->v_interlock);
142 simple_unlock(&dehash_slock);
dadab5e9 143 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td))
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144 goto loop;
145 return (dep);
146 }
147 }
148 simple_unlock(&dehash_slock);
149 return (NULL);
150}
151
152static void
153msdosfs_hashins(dep)
154 struct denode *dep;
155{
156 struct denode **depp, *deq;
157
158 simple_lock(&dehash_slock);
159 depp = &DEHASH(dep->de_dev, dep->de_dirclust, dep->de_diroffset);
160 deq = *depp;
161 if (deq)
162 deq->de_prev = &dep->de_next;
163 dep->de_next = deq;
164 dep->de_prev = depp;
165 *depp = dep;
166 simple_unlock(&dehash_slock);
167}
168
169static void
170msdosfs_hashrem(dep)
171 struct denode *dep;
172{
173 struct denode *deq;
174
175 simple_lock(&dehash_slock);
176 deq = dep->de_next;
177 if (deq)
178 deq->de_prev = dep->de_prev;
179 *dep->de_prev = deq;
180#ifdef DIAGNOSTIC
181 dep->de_next = NULL;
182 dep->de_prev = NULL;
183#endif
184 simple_unlock(&dehash_slock);
185}
186
187/*
188 * If deget() succeeds it returns with the gotten denode locked().
189 *
190 * pmp - address of msdosfsmount structure of the filesystem containing
191 * the denode of interest. The pm_dev field and the address of
192 * the msdosfsmount structure are used.
193 * dirclust - which cluster bp contains, if dirclust is 0 (root directory)
194 * diroffset is relative to the beginning of the root directory,
195 * otherwise it is cluster relative.
196 * diroffset - offset past begin of cluster of denode we want
197 * depp - returns the address of the gotten denode.
198 */
199int
200deget(pmp, dirclust, diroffset, depp)
201 struct msdosfsmount *pmp; /* so we know the maj/min number */
202 u_long dirclust; /* cluster this dir entry came from */
203 u_long diroffset; /* index of entry within the cluster */
204 struct denode **depp; /* returns the addr of the gotten denode */
205{
dadab5e9 206 struct thread *td = curthread; /* XXX */
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207 int error;
208 dev_t dev = pmp->pm_dev;
209 struct mount *mntp = pmp->pm_mountp;
210 struct direntry *direntptr;
211 struct denode *ldep;
212 struct vnode *nvp;
213 struct buf *bp;
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214 struct timeval tv;
215
216#ifdef MSDOSFS_DEBUG
217 printf("deget(pmp %p, dirclust %lu, diroffset %lx, depp %p)\n",
218 pmp, dirclust, diroffset, depp);
219#endif
220
221 /*
222 * On FAT32 filesystems, root is a (more or less) normal
223 * directory
224 */
225 if (FAT32(pmp) && dirclust == MSDOSFSROOT)
226 dirclust = pmp->pm_rootdirblk;
227
228 /*
229 * See if the denode is in the denode cache. Use the location of
230 * the directory entry to compute the hash value. For subdir use
231 * address of "." entry. For root dir (if not FAT32) use cluster
232 * MSDOSFSROOT, offset MSDOSFSROOT_OFS
233 *
234 * NOTE: The check for de_refcnt > 0 below insures the denode being
235 * examined does not represent an unlinked but still open file.
236 * These files are not to be accessible even when the directory
237 * entry that represented the file happens to be reused while the
238 * deleted file is still open.
239 */
240 ldep = msdosfs_hashget(dev, dirclust, diroffset);
241 if (ldep) {
242 *depp = ldep;
243 return (0);
244 }
245
246 /*
247 * Do the MALLOC before the getnewvnode since doing so afterward
248 * might cause a bogus v_data pointer to get dereferenced
249 * elsewhere if MALLOC should block.
250 */
251 MALLOC(ldep, struct denode *, sizeof(struct denode), M_MSDOSFSNODE, M_WAITOK);
252
253 /*
254 * Directory entry was not in cache, have to create a vnode and
255 * copy it from the passed disk buffer.
256 */
257 /* getnewvnode() does a VREF() on the vnode */
258 error = getnewvnode(VT_MSDOSFS, mntp, msdosfs_vnodeop_p, &nvp);
259 if (error) {
260 *depp = NULL;
261 FREE(ldep, M_MSDOSFSNODE);
262 return error;
263 }
264 bzero((caddr_t)ldep, sizeof *ldep);
265 lockinit(&ldep->de_lock, PINOD, "denode", VLKTIMEOUT, 0);
266 nvp->v_data = ldep;
267 ldep->de_vnode = nvp;
268 ldep->de_flag = 0;
269 ldep->de_devvp = 0;
270 ldep->de_dev = dev;
271 ldep->de_dirclust = dirclust;
272 ldep->de_diroffset = diroffset;
273 fc_purge(ldep, 0); /* init the fat cache for this denode */
274
275 /*
276 * Lock the denode so that it can't be accessed until we've read
277 * it in and have done what we need to it. Do this here instead
278 * of at the start of msdosfs_hashins() so that reinsert() can
279 * call msdosfs_hashins() with a locked denode.
280 */
dadab5e9 281 if (lockmgr(&ldep->de_lock, LK_EXCLUSIVE, (struct simplelock *)0, td))
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282 panic("deget: unexpected lock failure");
283
284 /*
285 * Insert the denode into the hash queue.
286 */
287 msdosfs_hashins(ldep);
288
289 ldep->de_pmp = pmp;
290 ldep->de_refcnt = 1;
291 /*
292 * Copy the directory entry into the denode area of the vnode.
293 */
294 if ((dirclust == MSDOSFSROOT
295 || (FAT32(pmp) && dirclust == pmp->pm_rootdirblk))
296 && diroffset == MSDOSFSROOT_OFS) {
297 /*
298 * Directory entry for the root directory. There isn't one,
299 * so we manufacture one. We should probably rummage
300 * through the root directory and find a label entry (if it
301 * exists), and then use the time and date from that entry
302 * as the time and date for the root denode.
303 */
304 nvp->v_flag |= VROOT; /* should be further down XXX */
305
306 ldep->de_Attributes = ATTR_DIRECTORY;
307 ldep->de_LowerCase = 0;
308 if (FAT32(pmp))
309 ldep->de_StartCluster = pmp->pm_rootdirblk;
310 /* de_FileSize will be filled in further down */
311 else {
312 ldep->de_StartCluster = MSDOSFSROOT;
313 ldep->de_FileSize = pmp->pm_rootdirsize * DEV_BSIZE;
314 }
315 /*
316 * fill in time and date so that dos2unixtime() doesn't
317 * spit up when called from msdosfs_getattr() with root
318 * denode
319 */
320 ldep->de_CHun = 0;
321 ldep->de_CTime = 0x0000; /* 00:00:00 */
322 ldep->de_CDate = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT)
323 | (1 << DD_DAY_SHIFT);
324 /* Jan 1, 1980 */
325 ldep->de_ADate = ldep->de_CDate;
326 ldep->de_MTime = ldep->de_CTime;
327 ldep->de_MDate = ldep->de_CDate;
328 /* leave the other fields as garbage */
329 } else {
330 error = readep(pmp, dirclust, diroffset, &bp, &direntptr);
331 if (error) {
332 /*
333 * The denode does not contain anything useful, so
334 * it would be wrong to leave it on its hash chain.
335 * Arrange for vput() to just forget about it.
336 */
337 ldep->de_Name[0] = SLOT_DELETED;
338
339 vput(nvp);
340 *depp = NULL;
341 return (error);
342 }
343 DE_INTERNALIZE(ldep, direntptr);
344 brelse(bp);
345 }
346
347 /*
348 * Fill in a few fields of the vnode and finish filling in the
349 * denode. Then return the address of the found denode.
350 */
351 if (ldep->de_Attributes & ATTR_DIRECTORY) {
352 /*
353 * Since DOS directory entries that describe directories
354 * have 0 in the filesize field, we take this opportunity
355 * to find out the length of the directory and plug it into
356 * the denode structure.
357 */
358 u_long size;
359
360 /*
361 * XXX Sometimes, these arrives that . entry have cluster
362 * number 0, when it shouldn't. Use real cluster number
363 * instead of what is written in directory entry.
364 */
365 if ((diroffset == 0) && (ldep->de_StartCluster != dirclust)) {
366 printf("deget(): . entry at clust %ld != %ld\n",
367 dirclust, ldep->de_StartCluster);
368 ldep->de_StartCluster = dirclust;
369 }
370
371 nvp->v_type = VDIR;
372 if (ldep->de_StartCluster != MSDOSFSROOT) {
373 error = pcbmap(ldep, 0xffff, 0, &size, 0);
374 if (error == E2BIG) {
375 ldep->de_FileSize = de_cn2off(pmp, size);
376 error = 0;
377 } else
378 printf("deget(): pcbmap returned %d\n", error);
379 }
380 } else
381 nvp->v_type = VREG;
382 getmicrouptime(&tv);
383 SETHIGH(ldep->de_modrev, tv.tv_sec);
384 SETLOW(ldep->de_modrev, tv.tv_usec * 4294);
385 ldep->de_devvp = pmp->pm_devvp;
386 VREF(ldep->de_devvp);
387 *depp = ldep;
388 return (0);
389}
390
391int
392deupdat(dep, waitfor)
393 struct denode *dep;
394 int waitfor;
395{
396 int error;
397 struct buf *bp;
398 struct direntry *dirp;
399 struct timespec ts;
400
401 if (DETOV(dep)->v_mount->mnt_flag & MNT_RDONLY)
402 return (0);
403 getnanotime(&ts);
404 DETIMES(dep, &ts, &ts, &ts);
405 if ((dep->de_flag & DE_MODIFIED) == 0)
406 return (0);
407 dep->de_flag &= ~DE_MODIFIED;
408 if (dep->de_Attributes & ATTR_DIRECTORY)
409 return (0);
410 if (dep->de_refcnt <= 0)
411 return (0);
412 error = readde(dep, &bp, &dirp);
413 if (error)
414 return (error);
415 DE_EXTERNALIZE(dirp, dep);
416 if (waitfor)
417 return (bwrite(bp));
418 else {
419 bdwrite(bp);
420 return (0);
421 }
422}
423
424/*
425 * Truncate the file described by dep to the length specified by length.
426 */
427int
dadab5e9 428detrunc(dep, length, flags, cred, td)
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429 struct denode *dep;
430 u_long length;
431 int flags;
432 struct ucred *cred;
dadab5e9 433 struct thread *td;
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434{
435 int error;
436 int allerror;
437 u_long eofentry;
438 u_long chaintofree;
439 daddr_t bn;
440 int boff;
441 int isadir = dep->de_Attributes & ATTR_DIRECTORY;
442 struct buf *bp;
443 struct msdosfsmount *pmp = dep->de_pmp;
444
445#ifdef MSDOSFS_DEBUG
446 printf("detrunc(): file %s, length %lu, flags %x\n", dep->de_Name, length, flags);
447#endif
448
449 /*
450 * Disallow attempts to truncate the root directory since it is of
451 * fixed size. That's just the way dos filesystems are. We use
452 * the VROOT bit in the vnode because checking for the directory
453 * bit and a startcluster of 0 in the denode is not adequate to
454 * recognize the root directory at this point in a file or
455 * directory's life.
456 */
457 if ((DETOV(dep)->v_flag & VROOT) && !FAT32(pmp)) {
458 printf("detrunc(): can't truncate root directory, clust %ld, offset %ld\n",
459 dep->de_dirclust, dep->de_diroffset);
460 return (EINVAL);
461 }
462
463
464 if (dep->de_FileSize < length) {
465 vnode_pager_setsize(DETOV(dep), length);
466 return deextend(dep, length, cred);
467 }
468
469 /*
470 * If the desired length is 0 then remember the starting cluster of
471 * the file and set the StartCluster field in the directory entry
472 * to 0. If the desired length is not zero, then get the number of
473 * the last cluster in the shortened file. Then get the number of
474 * the first cluster in the part of the file that is to be freed.
475 * Then set the next cluster pointer in the last cluster of the
476 * file to CLUST_EOFE.
477 */
478 if (length == 0) {
479 chaintofree = dep->de_StartCluster;
480 dep->de_StartCluster = 0;
481 eofentry = ~0;
482 } else {
483 error = pcbmap(dep, de_clcount(pmp, length) - 1, 0,
484 &eofentry, 0);
485 if (error) {
486#ifdef MSDOSFS_DEBUG
487 printf("detrunc(): pcbmap fails %d\n", error);
488#endif
489 return (error);
490 }
491 }
492
493 fc_purge(dep, de_clcount(pmp, length));
494
495 /*
496 * If the new length is not a multiple of the cluster size then we
497 * must zero the tail end of the new last cluster in case it
498 * becomes part of the file again because of a seek.
499 */
500 if ((boff = length & pmp->pm_crbomask) != 0) {
501 if (isadir) {
502 bn = cntobn(pmp, eofentry);
503 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster,
504 NOCRED, &bp);
505 } else {
506 bn = de_blk(pmp, length);
507 error = bread(DETOV(dep), bn, pmp->pm_bpcluster,
508 NOCRED, &bp);
509 }
510 if (error) {
511 brelse(bp);
512#ifdef MSDOSFS_DEBUG
513 printf("detrunc(): bread fails %d\n", error);
514#endif
515 return (error);
516 }
517 /*
518 * is this the right place for it?
519 */
520 bzero(bp->b_data + boff, pmp->pm_bpcluster - boff);
521 if (flags & IO_SYNC)
522 bwrite(bp);
523 else
524 bdwrite(bp);
525 }
526
527 /*
528 * Write out the updated directory entry. Even if the update fails
529 * we free the trailing clusters.
530 */
531 dep->de_FileSize = length;
532 if (!isadir)
533 dep->de_flag |= DE_UPDATE|DE_MODIFIED;
dadab5e9 534 allerror = vtruncbuf(DETOV(dep), cred, td, length, pmp->pm_bpcluster);
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535#ifdef MSDOSFS_DEBUG
536 if (allerror)
537 printf("detrunc(): vtruncbuf error %d\n", allerror);
538#endif
539 error = deupdat(dep, 1);
540 if (error && (allerror == 0))
541 allerror = error;
542#ifdef MSDOSFS_DEBUG
543 printf("detrunc(): allerror %d, eofentry %lu\n",
544 allerror, eofentry);
545#endif
546
547 /*
548 * If we need to break the cluster chain for the file then do it
549 * now.
550 */
551 if (eofentry != ~0) {
552 error = fatentry(FAT_GET_AND_SET, pmp, eofentry,
553 &chaintofree, CLUST_EOFE);
554 if (error) {
555#ifdef MSDOSFS_DEBUG
556 printf("detrunc(): fatentry errors %d\n", error);
557#endif
558 return (error);
559 }
560 fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1),
561 eofentry);
562 }
563
564 /*
565 * Now free the clusters removed from the file because of the
566 * truncation.
567 */
568 if (chaintofree != 0 && !MSDOSFSEOF(pmp, chaintofree))
569 freeclusterchain(pmp, chaintofree);
570
571 return (allerror);
572}
573
574/*
575 * Extend the file described by dep to length specified by length.
576 */
577int
578deextend(dep, length, cred)
579 struct denode *dep;
580 u_long length;
581 struct ucred *cred;
582{
583 struct msdosfsmount *pmp = dep->de_pmp;
584 u_long count;
585 int error;
586
587 /*
588 * The root of a DOS filesystem cannot be extended.
589 */
590 if ((DETOV(dep)->v_flag & VROOT) && !FAT32(pmp))
591 return (EINVAL);
592
593 /*
594 * Directories cannot be extended.
595 */
596 if (dep->de_Attributes & ATTR_DIRECTORY)
597 return (EISDIR);
598
599 if (length <= dep->de_FileSize)
600 panic("deextend: file too large");
601
602 /*
603 * Compute the number of clusters to allocate.
604 */
605 count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize);
606 if (count > 0) {
607 if (count > pmp->pm_freeclustercount)
608 return (ENOSPC);
609 error = extendfile(dep, count, NULL, NULL, DE_CLEAR);
610 if (error) {
611 /* truncate the added clusters away again */
612 (void) detrunc(dep, dep->de_FileSize, 0, cred, NULL);
613 return (error);
614 }
615 }
616 dep->de_FileSize = length;
617 dep->de_flag |= DE_UPDATE|DE_MODIFIED;
618 return (deupdat(dep, 1));
619}
620
621/*
622 * Move a denode to its correct hash queue after the file it represents has
623 * been moved to a new directory.
624 */
625void
626reinsert(dep)
627 struct denode *dep;
628{
629 /*
630 * Fix up the denode cache. If the denode is for a directory,
631 * there is nothing to do since the hash is based on the starting
632 * cluster of the directory file and that hasn't changed. If for a
633 * file the hash is based on the location of the directory entry,
634 * so we must remove it from the cache and re-enter it with the
635 * hash based on the new location of the directory entry.
636 */
637 if (dep->de_Attributes & ATTR_DIRECTORY)
638 return;
639 msdosfs_hashrem(dep);
640 msdosfs_hashins(dep);
641}
642
643int
644msdosfs_reclaim(ap)
645 struct vop_reclaim_args /* {
646 struct vnode *a_vp;
647 } */ *ap;
648{
649 struct vnode *vp = ap->a_vp;
650 struct denode *dep = VTODE(vp);
651
652#ifdef MSDOSFS_DEBUG
653 printf("msdosfs_reclaim(): dep %p, file %s, refcnt %ld\n",
654 dep, dep->de_Name, dep->de_refcnt);
655#endif
656
657 if (prtactive && vp->v_usecount != 0)
658 vprint("msdosfs_reclaim(): pushing active", vp);
659 /*
660 * Remove the denode from its hash chain.
661 */
662 msdosfs_hashrem(dep);
663 /*
664 * Purge old data structures associated with the denode.
665 */
666 cache_purge(vp);
667 if (dep->de_devvp) {
668 vrele(dep->de_devvp);
669 dep->de_devvp = 0;
670 }
671#if 0 /* XXX */
672 dep->de_flag = 0;
673#endif
674 FREE(dep, M_MSDOSFSNODE);
675 vp->v_data = NULL;
676
677 return (0);
678}
679
680int
681msdosfs_inactive(ap)
682 struct vop_inactive_args /* {
683 struct vnode *a_vp;
dadab5e9 684 struct thread *a_td;
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685 } */ *ap;
686{
687 struct vnode *vp = ap->a_vp;
688 struct denode *dep = VTODE(vp);
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689 int error = 0;
690
691#ifdef MSDOSFS_DEBUG
692 printf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep, dep->de_Name[0]);
693#endif
694
695 if (prtactive && vp->v_usecount != 0)
696 vprint("msdosfs_inactive(): pushing active", vp);
697
698 /*
699 * Ignore denodes related to stale file handles.
700 */
701 if (dep->de_Name[0] == SLOT_DELETED)
702 goto out;
703
704 /*
705 * If the file has been deleted and it is on a read/write
706 * filesystem, then truncate the file, and mark the directory slot
707 * as empty. (This may not be necessary for the dos filesystem.)
708 */
709#ifdef MSDOSFS_DEBUG
710 printf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %x, MNT_RDONLY %x\n",
711 dep, dep->de_refcnt, vp->v_mount->mnt_flag, MNT_RDONLY);
712#endif
713 if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
dadab5e9 714 error = detrunc(dep, (u_long) 0, 0, NOCRED, ap->a_td);
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715 dep->de_flag |= DE_UPDATE;
716 dep->de_Name[0] = SLOT_DELETED;
717 }
718 deupdat(dep, 0);
719
720out:
dadab5e9 721 VOP_UNLOCK(vp, 0, ap->a_td);
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722 /*
723 * If we are done with the denode, reclaim it
724 * so that it can be reused immediately.
725 */
726#ifdef MSDOSFS_DEBUG
727 printf("msdosfs_inactive(): v_usecount %d, de_Name[0] %x\n", vp->v_usecount,
728 dep->de_Name[0]);
729#endif
730 if (dep->de_Name[0] == SLOT_DELETED)
dadab5e9 731 vrecycle(vp, (struct simplelock *)0, ap->a_td);
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732 return (error);
733}