Use SYSREF to reference count struct vnode. v_usecount is now
[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 $ */
3c37c940 2/* $DragonFly: src/sys/vfs/msdosfs/msdosfs_denode.c,v 1.28 2007/05/06 19:23:34 dillon Exp $ */
984263bc
MD
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
1f2de5d4
MD
64#include "bpb.h"
65#include "msdosfsmount.h"
66#include "direntry.h"
67#include "denode.h"
68#include "fat.h"
984263bc 69
3446c007
MD
70static int msdosfs_hashins (struct denode *dep);
71static void msdosfs_hashrem (struct denode *dep);
72
984263bc
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73static MALLOC_DEFINE(M_MSDOSFSNODE, "MSDOSFS node", "MSDOSFS vnode private part");
74
75static struct denode **dehashtbl;
76static u_long dehash; /* size of hash table - 1 */
77#define DEHASH(dev, dcl, doff) (dehashtbl[(minor(dev) + (dcl) + (doff) / \
78 sizeof(struct direntry)) & dehash])
8a8d5d85 79static struct lwkt_token dehash_token;
984263bc
MD
80
81union _qcvt {
82 quad_t qcvt;
83 long val[2];
84};
85#define SETHIGH(q, h) { \
86 union _qcvt tmp; \
87 tmp.qcvt = (q); \
88 tmp.val[_QUAD_HIGHWORD] = (h); \
89 (q) = tmp.qcvt; \
90}
91#define SETLOW(q, l) { \
92 union _qcvt tmp; \
93 tmp.qcvt = (q); \
94 tmp.val[_QUAD_LOWWORD] = (l); \
95 (q) = tmp.qcvt; \
96}
97
98static struct denode *
b13267a5 99 msdosfs_hashget (cdev_t dev, u_long dirclust, u_long diroff);
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100
101/*ARGSUSED*/
102int
4625f023 103msdosfs_init(struct vfsconf *vfsp)
984263bc 104{
3446c007
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105 dehash = 16;
106 while (dehash < desiredvnodes)
107 dehash <<= 1;
efda3bd0 108 dehashtbl = kmalloc(sizeof(void *) * dehash, M_MSDOSFSMNT,
3446c007
MD
109 M_WAITOK|M_ZERO);
110 --dehash;
41a01a4d 111 lwkt_token_init(&dehash_token);
984263bc
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112 return (0);
113}
114
115int
4625f023 116msdosfs_uninit(struct vfsconf *vfsp)
984263bc
MD
117{
118
119 if (dehashtbl)
efda3bd0 120 kfree(dehashtbl, M_MSDOSFSMNT);
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MD
121 return (0);
122}
123
124static struct denode *
b13267a5 125msdosfs_hashget(cdev_t dev, u_long dirclust, u_long diroff)
984263bc 126{
984263bc 127 struct denode *dep;
41a01a4d 128 lwkt_tokref ilock;
984263bc
MD
129 struct vnode *vp;
130
41a01a4d 131 lwkt_gettoken(&ilock, &dehash_token);
984263bc 132loop:
984263bc 133 for (dep = DEHASH(dev, dirclust, diroff); dep; dep = dep->de_next) {
41a01a4d
MD
134 if (dirclust != dep->de_dirclust
135 || diroff != dep->de_diroffset
136 || dev != dep->de_dev
137 || dep->de_refcnt == 0) {
138 continue;
139 }
140 vp = DETOV(dep);
87de5057 141 if (vget(vp, LK_EXCLUSIVE))
5fd012e0 142 goto loop;
3446c007 143
41a01a4d
MD
144 /*
145 * We must check to see if the inode has been ripped
146 * out from under us after blocking.
147 */
148 for (dep = DEHASH(dev, dirclust, diroff); dep; dep = dep->de_next) {
149 if (dirclust == dep->de_dirclust
150 && diroff == dep->de_diroffset
151 && dev == dep->de_dev
152 && dep->de_refcnt != 0) {
153 break;
4954c633 154 }
984263bc 155 }
41a01a4d 156 if (dep == NULL || DETOV(dep) != vp) {
5fd012e0 157 vput(vp);
41a01a4d
MD
158 goto loop;
159 }
41a01a4d
MD
160 lwkt_reltoken(&ilock);
161 return (dep);
984263bc 162 }
41a01a4d 163 lwkt_reltoken(&ilock);
984263bc
MD
164 return (NULL);
165}
166
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MD
167static
168int
4625f023 169msdosfs_hashins(struct denode *dep)
984263bc
MD
170{
171 struct denode **depp, *deq;
41a01a4d 172 lwkt_tokref ilock;
984263bc 173
41a01a4d 174 lwkt_gettoken(&ilock, &dehash_token);
984263bc 175 depp = &DEHASH(dep->de_dev, dep->de_dirclust, dep->de_diroffset);
3446c007
MD
176 while ((deq = *depp) != NULL) {
177 if (deq->de_dev == dep->de_dev &&
178 deq->de_dirclust == dep->de_dirclust &&
179 deq->de_diroffset == dep->de_diroffset) {
180 lwkt_reltoken(&ilock);
181 return(EBUSY);
182 }
183 depp = &deq->de_next;
184 }
185 dep->de_next = NULL;
984263bc 186 *depp = dep;
41a01a4d 187 lwkt_reltoken(&ilock);
3446c007 188 return(0);
984263bc
MD
189}
190
3446c007
MD
191static
192void
4625f023 193msdosfs_hashrem(struct denode *dep)
984263bc 194{
3446c007 195 struct denode **depp, *deq;
41a01a4d 196 lwkt_tokref ilock;
984263bc 197
41a01a4d 198 lwkt_gettoken(&ilock, &dehash_token);
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MD
199 depp = &DEHASH(dep->de_dev, dep->de_dirclust, dep->de_diroffset);
200 while ((deq = *depp) != NULL) {
201 if (dep == deq)
202 break;
203 depp = &deq->de_next;
204 }
205 KKASSERT(dep == deq);
206 *depp = dep->de_next;
984263bc 207 dep->de_next = NULL;
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MD
208 lwkt_reltoken(&ilock);
209}
210
211void
212msdosfs_reinsert(struct denode *ip, u_long new_dirclust, u_long new_diroffset)
213{
214 lwkt_tokref ilock;
215
216 lwkt_gettoken(&ilock, &dehash_token);
217 msdosfs_hashrem(ip);
218 ip->de_dirclust = new_dirclust;
219 ip->de_diroffset = new_diroffset;
220 msdosfs_hashins(ip);
41a01a4d 221 lwkt_reltoken(&ilock);
984263bc
MD
222}
223
224/*
225 * If deget() succeeds it returns with the gotten denode locked().
226 *
227 * pmp - address of msdosfsmount structure of the filesystem containing
228 * the denode of interest. The pm_dev field and the address of
229 * the msdosfsmount structure are used.
230 * dirclust - which cluster bp contains, if dirclust is 0 (root directory)
231 * diroffset is relative to the beginning of the root directory,
232 * otherwise it is cluster relative.
233 * diroffset - offset past begin of cluster of denode we want
234 * depp - returns the address of the gotten denode.
235 */
236int
4625f023
CP
237deget(struct msdosfsmount *pmp, /* so we know the maj/min number */
238 u_long dirclust, /* cluster this dir entry came from */
239 u_long diroffset, /* index of entry within the cluster */
240 struct denode **depp) /* returns the addr of the gotten denode */
984263bc
MD
241{
242 int error;
b13267a5 243 cdev_t dev = pmp->pm_dev;
984263bc
MD
244 struct mount *mntp = pmp->pm_mountp;
245 struct direntry *direntptr;
246 struct denode *ldep;
247 struct vnode *nvp;
248 struct buf *bp;
984263bc
MD
249 struct timeval tv;
250
251#ifdef MSDOSFS_DEBUG
086c1d7e 252 kprintf("deget(pmp %p, dirclust %lu, diroffset %lx, depp %p)\n",
984263bc
MD
253 pmp, dirclust, diroffset, depp);
254#endif
255
256 /*
257 * On FAT32 filesystems, root is a (more or less) normal
258 * directory
259 */
260 if (FAT32(pmp) && dirclust == MSDOSFSROOT)
261 dirclust = pmp->pm_rootdirblk;
262
3446c007 263again:
984263bc
MD
264 /*
265 * See if the denode is in the denode cache. Use the location of
266 * the directory entry to compute the hash value. For subdir use
267 * address of "." entry. For root dir (if not FAT32) use cluster
268 * MSDOSFSROOT, offset MSDOSFSROOT_OFS
269 *
270 * NOTE: The check for de_refcnt > 0 below insures the denode being
271 * examined does not represent an unlinked but still open file.
272 * These files are not to be accessible even when the directory
273 * entry that represented the file happens to be reused while the
274 * deleted file is still open.
275 */
276 ldep = msdosfs_hashget(dev, dirclust, diroffset);
277 if (ldep) {
278 *depp = ldep;
279 return (0);
280 }
281
282 /*
283 * Do the MALLOC before the getnewvnode since doing so afterward
284 * might cause a bogus v_data pointer to get dereferenced
285 * elsewhere if MALLOC should block.
286 */
287 MALLOC(ldep, struct denode *, sizeof(struct denode), M_MSDOSFSNODE, M_WAITOK);
288
289 /*
290 * Directory entry was not in cache, have to create a vnode and
291 * copy it from the passed disk buffer.
292 */
3446c007 293
597aea93 294 /* getnewvnode() does a vref() on the vnode */
6ddb7618 295 error = getnewvnode(VT_MSDOSFS, mntp, &nvp, VLKTIMEOUT, 0);
984263bc
MD
296 if (error) {
297 *depp = NULL;
298 FREE(ldep, M_MSDOSFSNODE);
299 return error;
300 }
3446c007 301
984263bc 302 bzero((caddr_t)ldep, sizeof *ldep);
984263bc
MD
303 ldep->de_vnode = nvp;
304 ldep->de_flag = 0;
305 ldep->de_devvp = 0;
306 ldep->de_dev = dev;
307 ldep->de_dirclust = dirclust;
308 ldep->de_diroffset = diroffset;
309 fc_purge(ldep, 0); /* init the fat cache for this denode */
310
311 /*
3446c007
MD
312 * Insert the denode into the hash queue. If a collision occurs
313 * throw away the vnode and try again.
984263bc 314 */
3446c007 315 if (msdosfs_hashins(ldep) != 0) {
086c1d7e 316 kprintf("debug: msdosfs: hashins collision, retrying\n");
5fd012e0 317 vx_put(nvp);
efda3bd0 318 kfree(ldep, M_MSDOSFSNODE);
3446c007
MD
319 goto again;
320 }
321 nvp->v_data = ldep;
984263bc
MD
322 ldep->de_pmp = pmp;
323 ldep->de_refcnt = 1;
324 /*
325 * Copy the directory entry into the denode area of the vnode.
326 */
327 if ((dirclust == MSDOSFSROOT
328 || (FAT32(pmp) && dirclust == pmp->pm_rootdirblk))
329 && diroffset == MSDOSFSROOT_OFS) {
330 /*
331 * Directory entry for the root directory. There isn't one,
332 * so we manufacture one. We should probably rummage
333 * through the root directory and find a label entry (if it
334 * exists), and then use the time and date from that entry
335 * as the time and date for the root denode.
336 */
337 nvp->v_flag |= VROOT; /* should be further down XXX */
338
339 ldep->de_Attributes = ATTR_DIRECTORY;
340 ldep->de_LowerCase = 0;
341 if (FAT32(pmp))
342 ldep->de_StartCluster = pmp->pm_rootdirblk;
343 /* de_FileSize will be filled in further down */
344 else {
345 ldep->de_StartCluster = MSDOSFSROOT;
346 ldep->de_FileSize = pmp->pm_rootdirsize * DEV_BSIZE;
347 }
348 /*
349 * fill in time and date so that dos2unixtime() doesn't
350 * spit up when called from msdosfs_getattr() with root
351 * denode
352 */
353 ldep->de_CHun = 0;
354 ldep->de_CTime = 0x0000; /* 00:00:00 */
355 ldep->de_CDate = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT)
356 | (1 << DD_DAY_SHIFT);
357 /* Jan 1, 1980 */
358 ldep->de_ADate = ldep->de_CDate;
359 ldep->de_MTime = ldep->de_CTime;
360 ldep->de_MDate = ldep->de_CDate;
361 /* leave the other fields as garbage */
362 } else {
363 error = readep(pmp, dirclust, diroffset, &bp, &direntptr);
364 if (error) {
365 /*
366 * The denode does not contain anything useful, so
367 * it would be wrong to leave it on its hash chain.
368 * Arrange for vput() to just forget about it.
369 */
370 ldep->de_Name[0] = SLOT_DELETED;
371
5fd012e0 372 vx_put(nvp);
984263bc
MD
373 *depp = NULL;
374 return (error);
375 }
376 DE_INTERNALIZE(ldep, direntptr);
377 brelse(bp);
378 }
379
380 /*
381 * Fill in a few fields of the vnode and finish filling in the
382 * denode. Then return the address of the found denode.
383 */
384 if (ldep->de_Attributes & ATTR_DIRECTORY) {
385 /*
386 * Since DOS directory entries that describe directories
387 * have 0 in the filesize field, we take this opportunity
388 * to find out the length of the directory and plug it into
389 * the denode structure.
390 */
391 u_long size;
392
393 /*
394 * XXX Sometimes, these arrives that . entry have cluster
395 * number 0, when it shouldn't. Use real cluster number
396 * instead of what is written in directory entry.
397 */
398 if ((diroffset == 0) && (ldep->de_StartCluster != dirclust)) {
086c1d7e 399 kprintf("deget(): . entry at clust %ld != %ld\n",
984263bc
MD
400 dirclust, ldep->de_StartCluster);
401 ldep->de_StartCluster = dirclust;
402 }
403
404 nvp->v_type = VDIR;
405 if (ldep->de_StartCluster != MSDOSFSROOT) {
4afd80f1 406 error = pcbmap(ldep, 0xffff, NULL, &size, NULL);
984263bc
MD
407 if (error == E2BIG) {
408 ldep->de_FileSize = de_cn2off(pmp, size);
409 error = 0;
410 } else
086c1d7e 411 kprintf("deget(): pcbmap returned %d\n", error);
984263bc 412 }
5fd012e0 413 } else {
984263bc 414 nvp->v_type = VREG;
5fd012e0 415 }
984263bc
MD
416 getmicrouptime(&tv);
417 SETHIGH(ldep->de_modrev, tv.tv_sec);
418 SETLOW(ldep->de_modrev, tv.tv_usec * 4294);
419 ldep->de_devvp = pmp->pm_devvp;
597aea93 420 vref(ldep->de_devvp);
1c843a13 421 vinitvmio(nvp, ldep->de_FileSize);
5fd012e0
MD
422 /*
423 * Leave nvp locked and refd so the returned inode is effectively
424 * locked and refd.
425 */
984263bc
MD
426 *depp = ldep;
427 return (0);
428}
429
430int
4625f023 431deupdat(struct denode *dep, int waitfor)
984263bc
MD
432{
433 int error;
434 struct buf *bp;
435 struct direntry *dirp;
436 struct timespec ts;
437
438 if (DETOV(dep)->v_mount->mnt_flag & MNT_RDONLY)
439 return (0);
440 getnanotime(&ts);
441 DETIMES(dep, &ts, &ts, &ts);
442 if ((dep->de_flag & DE_MODIFIED) == 0)
443 return (0);
444 dep->de_flag &= ~DE_MODIFIED;
445 if (dep->de_Attributes & ATTR_DIRECTORY)
446 return (0);
447 if (dep->de_refcnt <= 0)
448 return (0);
449 error = readde(dep, &bp, &dirp);
450 if (error)
451 return (error);
452 DE_EXTERNALIZE(dirp, dep);
453 if (waitfor)
454 return (bwrite(bp));
455 else {
456 bdwrite(bp);
457 return (0);
458 }
459}
460
461/*
462 * Truncate the file described by dep to the length specified by length.
463 */
464int
87de5057 465detrunc(struct denode *dep, u_long length, int flags)
984263bc
MD
466{
467 int error;
468 int allerror;
469 u_long eofentry;
470 u_long chaintofree;
4afd80f1 471 daddr_t bn, cn;
984263bc
MD
472 int boff;
473 int isadir = dep->de_Attributes & ATTR_DIRECTORY;
474 struct buf *bp;
475 struct msdosfsmount *pmp = dep->de_pmp;
476
477#ifdef MSDOSFS_DEBUG
086c1d7e 478 kprintf("detrunc(): file %s, length %lu, flags %x\n", dep->de_Name, length, flags);
984263bc
MD
479#endif
480
481 /*
482 * Disallow attempts to truncate the root directory since it is of
483 * fixed size. That's just the way dos filesystems are. We use
484 * the VROOT bit in the vnode because checking for the directory
485 * bit and a startcluster of 0 in the denode is not adequate to
486 * recognize the root directory at this point in a file or
487 * directory's life.
488 */
489 if ((DETOV(dep)->v_flag & VROOT) && !FAT32(pmp)) {
086c1d7e 490 kprintf("detrunc(): can't truncate root directory, clust %ld, offset %ld\n",
984263bc
MD
491 dep->de_dirclust, dep->de_diroffset);
492 return (EINVAL);
493 }
494
495
496 if (dep->de_FileSize < length) {
497 vnode_pager_setsize(DETOV(dep), length);
3b568787 498 return deextend(dep, length);
984263bc
MD
499 }
500
501 /*
502 * If the desired length is 0 then remember the starting cluster of
503 * the file and set the StartCluster field in the directory entry
504 * to 0. If the desired length is not zero, then get the number of
505 * the last cluster in the shortened file. Then get the number of
506 * the first cluster in the part of the file that is to be freed.
507 * Then set the next cluster pointer in the last cluster of the
508 * file to CLUST_EOFE.
509 */
510 if (length == 0) {
511 chaintofree = dep->de_StartCluster;
512 dep->de_StartCluster = 0;
513 eofentry = ~0;
514 } else {
4afd80f1
MD
515 error = pcbmap(dep, de_clcount(pmp, length) - 1,
516 NULL, &eofentry, NULL);
984263bc
MD
517 if (error) {
518#ifdef MSDOSFS_DEBUG
086c1d7e 519 kprintf("detrunc(): pcbmap fails %d\n", error);
984263bc
MD
520#endif
521 return (error);
522 }
523 }
524
525 fc_purge(dep, de_clcount(pmp, length));
526
527 /*
528 * If the new length is not a multiple of the cluster size then we
529 * must zero the tail end of the new last cluster in case it
530 * becomes part of the file again because of a seek.
531 */
532 if ((boff = length & pmp->pm_crbomask) != 0) {
533 if (isadir) {
4afd80f1 534 bn = xcntobn(pmp, eofentry);
54078292 535 error = bread(pmp->pm_devvp, de_bntodoff(pmp, bn), pmp->pm_bpcluster, &bp);
984263bc 536 } else {
4afd80f1
MD
537 cn = de_cluster(pmp, length);
538 error = bread(DETOV(dep), de_cn2doff(pmp, cn), pmp->pm_bpcluster, &bp);
984263bc
MD
539 }
540 if (error) {
541 brelse(bp);
542#ifdef MSDOSFS_DEBUG
086c1d7e 543 kprintf("detrunc(): bread fails %d\n", error);
984263bc
MD
544#endif
545 return (error);
546 }
547 /*
548 * is this the right place for it?
549 */
550 bzero(bp->b_data + boff, pmp->pm_bpcluster - boff);
551 if (flags & IO_SYNC)
552 bwrite(bp);
553 else
554 bdwrite(bp);
555 }
556
557 /*
558 * Write out the updated directory entry. Even if the update fails
559 * we free the trailing clusters.
560 */
561 dep->de_FileSize = length;
562 if (!isadir)
563 dep->de_flag |= DE_UPDATE|DE_MODIFIED;
87de5057 564 allerror = vtruncbuf(DETOV(dep), length, pmp->pm_bpcluster);
984263bc
MD
565#ifdef MSDOSFS_DEBUG
566 if (allerror)
086c1d7e 567 kprintf("detrunc(): vtruncbuf error %d\n", allerror);
984263bc
MD
568#endif
569 error = deupdat(dep, 1);
570 if (error && (allerror == 0))
571 allerror = error;
572#ifdef MSDOSFS_DEBUG
086c1d7e 573 kprintf("detrunc(): allerror %d, eofentry %lu\n",
984263bc
MD
574 allerror, eofentry);
575#endif
576
577 /*
578 * If we need to break the cluster chain for the file then do it
579 * now.
580 */
581 if (eofentry != ~0) {
582 error = fatentry(FAT_GET_AND_SET, pmp, eofentry,
583 &chaintofree, CLUST_EOFE);
584 if (error) {
585#ifdef MSDOSFS_DEBUG
086c1d7e 586 kprintf("detrunc(): fatentry errors %d\n", error);
984263bc
MD
587#endif
588 return (error);
589 }
590 fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1),
591 eofentry);
592 }
593
594 /*
595 * Now free the clusters removed from the file because of the
596 * truncation.
597 */
598 if (chaintofree != 0 && !MSDOSFSEOF(pmp, chaintofree))
599 freeclusterchain(pmp, chaintofree);
600
601 return (allerror);
602}
603
604/*
605 * Extend the file described by dep to length specified by length.
606 */
607int
4625f023 608deextend(struct denode *dep, u_long length)
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MD
609{
610 struct msdosfsmount *pmp = dep->de_pmp;
611 u_long count;
612 int error;
613
614 /*
615 * The root of a DOS filesystem cannot be extended.
616 */
617 if ((DETOV(dep)->v_flag & VROOT) && !FAT32(pmp))
618 return (EINVAL);
619
620 /*
621 * Directories cannot be extended.
622 */
623 if (dep->de_Attributes & ATTR_DIRECTORY)
624 return (EISDIR);
625
626 if (length <= dep->de_FileSize)
627 panic("deextend: file too large");
628
629 /*
630 * Compute the number of clusters to allocate.
631 */
632 count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize);
633 if (count > 0) {
634 if (count > pmp->pm_freeclustercount)
635 return (ENOSPC);
636 error = extendfile(dep, count, NULL, NULL, DE_CLEAR);
637 if (error) {
638 /* truncate the added clusters away again */
87de5057 639 detrunc(dep, dep->de_FileSize, 0);
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640 return (error);
641 }
642 }
643 dep->de_FileSize = length;
644 dep->de_flag |= DE_UPDATE|DE_MODIFIED;
645 return (deupdat(dep, 1));
646}
647
4625f023
CP
648/*
649 * msdosfs_reclaim(struct vnode *a_vp)
650 */
984263bc 651int
4625f023 652msdosfs_reclaim(struct vop_reclaim_args *ap)
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MD
653{
654 struct vnode *vp = ap->a_vp;
655 struct denode *dep = VTODE(vp);
656
657#ifdef MSDOSFS_DEBUG
086c1d7e 658 kprintf("msdosfs_reclaim(): dep %p, file %s, refcnt %ld\n",
3446c007 659 dep, dep ? dep->de_Name : "?", dep ? dep->de_refcnt : -1);
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660#endif
661
3c37c940 662 if (prtactive && vp->v_sysref.refcnt > 1)
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663 vprint("msdosfs_reclaim(): pushing active", vp);
664 /*
5fd012e0 665 * Remove the denode from its hash chain.
984263bc 666 */
984263bc 667 vp->v_data = NULL;
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MD
668 if (dep) {
669 msdosfs_hashrem(dep);
670 if (dep->de_devvp) {
671 vrele(dep->de_devvp);
672 dep->de_devvp = 0;
673 }
efda3bd0 674 kfree(dep, M_MSDOSFSNODE);
3446c007 675 }
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676 return (0);
677}
678
4625f023
CP
679/*
680 * msdosfs_inactive(struct vnode *a_vp, struct thread *a_td)
681 */
984263bc 682int
4625f023 683msdosfs_inactive(struct vop_inactive_args *ap)
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MD
684{
685 struct vnode *vp = ap->a_vp;
686 struct denode *dep = VTODE(vp);
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687 int error = 0;
688
689#ifdef MSDOSFS_DEBUG
086c1d7e 690 kprintf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep, dep->de_Name[0]);
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691#endif
692
3c37c940 693 if (prtactive && vp->v_sysref.refcnt > 1)
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694 vprint("msdosfs_inactive(): pushing active", vp);
695
696 /*
697 * Ignore denodes related to stale file handles.
698 */
699 if (dep->de_Name[0] == SLOT_DELETED)
700 goto out;
701
702 /*
703 * If the file has been deleted and it is on a read/write
704 * filesystem, then truncate the file, and mark the directory slot
705 * as empty. (This may not be necessary for the dos filesystem.)
706 */
707#ifdef MSDOSFS_DEBUG
086c1d7e 708 kprintf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %x, MNT_RDONLY %x\n",
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MD
709 dep, dep->de_refcnt, vp->v_mount->mnt_flag, MNT_RDONLY);
710#endif
711 if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
87de5057 712 error = detrunc(dep, (u_long) 0, 0);
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713 dep->de_flag |= DE_UPDATE;
714 dep->de_Name[0] = SLOT_DELETED;
715 }
716 deupdat(dep, 0);
717
718out:
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719 /*
720 * If we are done with the denode, reclaim it
721 * so that it can be reused immediately.
722 */
723#ifdef MSDOSFS_DEBUG
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MD
724 kprintf("msdosfs_inactive(): v_sysrefs %d, de_Name[0] %x\n",
725 vp->v_sysref.refcnt, dep->de_Name[0]);
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726#endif
727 if (dep->de_Name[0] == SLOT_DELETED)
87de5057 728 vrecycle(vp);
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729 return (error);
730}