Due to continuing issues with VOP_READ/VOP_WRITE ops being called without
[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 $ */
1c843a13 2/* $DragonFly: src/sys/vfs/msdosfs/msdosfs_denode.c,v 1.23 2006/04/07 06:38:32 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 *
3446c007 99 msdosfs_hashget (dev_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;
108 dehashtbl = malloc(sizeof(void *) * dehash, M_MSDOSFSMNT,
109 M_WAITOK|M_ZERO);
110 --dehash;
41a01a4d 111 lwkt_token_init(&dehash_token);
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112 return (0);
113}
114
115int
4625f023 116msdosfs_uninit(struct vfsconf *vfsp)
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MD
117{
118
119 if (dehashtbl)
120 free(dehashtbl, M_MSDOSFSMNT);
121 return (0);
122}
123
124static struct denode *
4625f023 125msdosfs_hashget(dev_t dev, u_long dirclust, u_long diroff)
984263bc 126{
dadab5e9 127 struct thread *td = curthread; /* XXX */
984263bc 128 struct denode *dep;
41a01a4d 129 lwkt_tokref ilock;
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MD
130 struct vnode *vp;
131
41a01a4d 132 lwkt_gettoken(&ilock, &dehash_token);
984263bc 133loop:
984263bc 134 for (dep = DEHASH(dev, dirclust, diroff); dep; dep = dep->de_next) {
41a01a4d
MD
135 if (dirclust != dep->de_dirclust
136 || diroff != dep->de_diroffset
137 || dev != dep->de_dev
138 || dep->de_refcnt == 0) {
139 continue;
140 }
141 vp = DETOV(dep);
5fd012e0
MD
142 if (vget(vp, LK_EXCLUSIVE, td))
143 goto loop;
3446c007 144
41a01a4d
MD
145 /*
146 * We must check to see if the inode has been ripped
147 * out from under us after blocking.
148 */
149 for (dep = DEHASH(dev, dirclust, diroff); dep; dep = dep->de_next) {
150 if (dirclust == dep->de_dirclust
151 && diroff == dep->de_diroffset
152 && dev == dep->de_dev
153 && dep->de_refcnt != 0) {
154 break;
4954c633 155 }
984263bc 156 }
41a01a4d 157 if (dep == NULL || DETOV(dep) != vp) {
5fd012e0 158 vput(vp);
41a01a4d
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159 goto loop;
160 }
41a01a4d
MD
161 lwkt_reltoken(&ilock);
162 return (dep);
984263bc 163 }
41a01a4d 164 lwkt_reltoken(&ilock);
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165 return (NULL);
166}
167
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168static
169int
4625f023 170msdosfs_hashins(struct denode *dep)
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171{
172 struct denode **depp, *deq;
41a01a4d 173 lwkt_tokref ilock;
984263bc 174
41a01a4d 175 lwkt_gettoken(&ilock, &dehash_token);
984263bc 176 depp = &DEHASH(dep->de_dev, dep->de_dirclust, dep->de_diroffset);
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MD
177 while ((deq = *depp) != NULL) {
178 if (deq->de_dev == dep->de_dev &&
179 deq->de_dirclust == dep->de_dirclust &&
180 deq->de_diroffset == dep->de_diroffset) {
181 lwkt_reltoken(&ilock);
182 return(EBUSY);
183 }
184 depp = &deq->de_next;
185 }
186 dep->de_next = NULL;
984263bc 187 *depp = dep;
41a01a4d 188 lwkt_reltoken(&ilock);
3446c007 189 return(0);
984263bc
MD
190}
191
3446c007
MD
192static
193void
4625f023 194msdosfs_hashrem(struct denode *dep)
984263bc 195{
3446c007 196 struct denode **depp, *deq;
41a01a4d 197 lwkt_tokref ilock;
984263bc 198
41a01a4d 199 lwkt_gettoken(&ilock, &dehash_token);
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MD
200 depp = &DEHASH(dep->de_dev, dep->de_dirclust, dep->de_diroffset);
201 while ((deq = *depp) != NULL) {
202 if (dep == deq)
203 break;
204 depp = &deq->de_next;
205 }
206 KKASSERT(dep == deq);
207 *depp = dep->de_next;
984263bc 208 dep->de_next = NULL;
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209 lwkt_reltoken(&ilock);
210}
211
212void
213msdosfs_reinsert(struct denode *ip, u_long new_dirclust, u_long new_diroffset)
214{
215 lwkt_tokref ilock;
216
217 lwkt_gettoken(&ilock, &dehash_token);
218 msdosfs_hashrem(ip);
219 ip->de_dirclust = new_dirclust;
220 ip->de_diroffset = new_diroffset;
221 msdosfs_hashins(ip);
41a01a4d 222 lwkt_reltoken(&ilock);
984263bc
MD
223}
224
225/*
226 * If deget() succeeds it returns with the gotten denode locked().
227 *
228 * pmp - address of msdosfsmount structure of the filesystem containing
229 * the denode of interest. The pm_dev field and the address of
230 * the msdosfsmount structure are used.
231 * dirclust - which cluster bp contains, if dirclust is 0 (root directory)
232 * diroffset is relative to the beginning of the root directory,
233 * otherwise it is cluster relative.
234 * diroffset - offset past begin of cluster of denode we want
235 * depp - returns the address of the gotten denode.
236 */
237int
4625f023
CP
238deget(struct msdosfsmount *pmp, /* so we know the maj/min number */
239 u_long dirclust, /* cluster this dir entry came from */
240 u_long diroffset, /* index of entry within the cluster */
241 struct denode **depp) /* returns the addr of the gotten denode */
984263bc
MD
242{
243 int error;
244 dev_t dev = pmp->pm_dev;
245 struct mount *mntp = pmp->pm_mountp;
246 struct direntry *direntptr;
247 struct denode *ldep;
248 struct vnode *nvp;
249 struct buf *bp;
984263bc
MD
250 struct timeval tv;
251
252#ifdef MSDOSFS_DEBUG
253 printf("deget(pmp %p, dirclust %lu, diroffset %lx, depp %p)\n",
254 pmp, dirclust, diroffset, depp);
255#endif
256
257 /*
258 * On FAT32 filesystems, root is a (more or less) normal
259 * directory
260 */
261 if (FAT32(pmp) && dirclust == MSDOSFSROOT)
262 dirclust = pmp->pm_rootdirblk;
263
3446c007 264again:
984263bc
MD
265 /*
266 * See if the denode is in the denode cache. Use the location of
267 * the directory entry to compute the hash value. For subdir use
268 * address of "." entry. For root dir (if not FAT32) use cluster
269 * MSDOSFSROOT, offset MSDOSFSROOT_OFS
270 *
271 * NOTE: The check for de_refcnt > 0 below insures the denode being
272 * examined does not represent an unlinked but still open file.
273 * These files are not to be accessible even when the directory
274 * entry that represented the file happens to be reused while the
275 * deleted file is still open.
276 */
277 ldep = msdosfs_hashget(dev, dirclust, diroffset);
278 if (ldep) {
279 *depp = ldep;
280 return (0);
281 }
282
283 /*
284 * Do the MALLOC before the getnewvnode since doing so afterward
285 * might cause a bogus v_data pointer to get dereferenced
286 * elsewhere if MALLOC should block.
287 */
288 MALLOC(ldep, struct denode *, sizeof(struct denode), M_MSDOSFSNODE, M_WAITOK);
289
290 /*
291 * Directory entry was not in cache, have to create a vnode and
292 * copy it from the passed disk buffer.
293 */
3446c007 294
597aea93 295 /* getnewvnode() does a vref() on the vnode */
6ddb7618 296 error = getnewvnode(VT_MSDOSFS, mntp, &nvp, VLKTIMEOUT, 0);
984263bc
MD
297 if (error) {
298 *depp = NULL;
299 FREE(ldep, M_MSDOSFSNODE);
300 return error;
301 }
3446c007 302
984263bc 303 bzero((caddr_t)ldep, sizeof *ldep);
984263bc
MD
304 ldep->de_vnode = nvp;
305 ldep->de_flag = 0;
306 ldep->de_devvp = 0;
307 ldep->de_dev = dev;
308 ldep->de_dirclust = dirclust;
309 ldep->de_diroffset = diroffset;
310 fc_purge(ldep, 0); /* init the fat cache for this denode */
311
312 /*
3446c007
MD
313 * Insert the denode into the hash queue. If a collision occurs
314 * throw away the vnode and try again.
984263bc 315 */
3446c007
MD
316 if (msdosfs_hashins(ldep) != 0) {
317 printf("debug: msdosfs: hashins collision, retrying\n");
5fd012e0 318 vx_put(nvp);
3446c007
MD
319 free(ldep, M_MSDOSFSNODE);
320 goto again;
321 }
322 nvp->v_data = ldep;
984263bc
MD
323 ldep->de_pmp = pmp;
324 ldep->de_refcnt = 1;
325 /*
326 * Copy the directory entry into the denode area of the vnode.
327 */
328 if ((dirclust == MSDOSFSROOT
329 || (FAT32(pmp) && dirclust == pmp->pm_rootdirblk))
330 && diroffset == MSDOSFSROOT_OFS) {
331 /*
332 * Directory entry for the root directory. There isn't one,
333 * so we manufacture one. We should probably rummage
334 * through the root directory and find a label entry (if it
335 * exists), and then use the time and date from that entry
336 * as the time and date for the root denode.
337 */
338 nvp->v_flag |= VROOT; /* should be further down XXX */
339
340 ldep->de_Attributes = ATTR_DIRECTORY;
341 ldep->de_LowerCase = 0;
342 if (FAT32(pmp))
343 ldep->de_StartCluster = pmp->pm_rootdirblk;
344 /* de_FileSize will be filled in further down */
345 else {
346 ldep->de_StartCluster = MSDOSFSROOT;
347 ldep->de_FileSize = pmp->pm_rootdirsize * DEV_BSIZE;
348 }
349 /*
350 * fill in time and date so that dos2unixtime() doesn't
351 * spit up when called from msdosfs_getattr() with root
352 * denode
353 */
354 ldep->de_CHun = 0;
355 ldep->de_CTime = 0x0000; /* 00:00:00 */
356 ldep->de_CDate = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT)
357 | (1 << DD_DAY_SHIFT);
358 /* Jan 1, 1980 */
359 ldep->de_ADate = ldep->de_CDate;
360 ldep->de_MTime = ldep->de_CTime;
361 ldep->de_MDate = ldep->de_CDate;
362 /* leave the other fields as garbage */
363 } else {
364 error = readep(pmp, dirclust, diroffset, &bp, &direntptr);
365 if (error) {
366 /*
367 * The denode does not contain anything useful, so
368 * it would be wrong to leave it on its hash chain.
369 * Arrange for vput() to just forget about it.
370 */
371 ldep->de_Name[0] = SLOT_DELETED;
372
5fd012e0 373 vx_put(nvp);
984263bc
MD
374 *depp = NULL;
375 return (error);
376 }
377 DE_INTERNALIZE(ldep, direntptr);
378 brelse(bp);
379 }
380
381 /*
382 * Fill in a few fields of the vnode and finish filling in the
383 * denode. Then return the address of the found denode.
384 */
385 if (ldep->de_Attributes & ATTR_DIRECTORY) {
386 /*
387 * Since DOS directory entries that describe directories
388 * have 0 in the filesize field, we take this opportunity
389 * to find out the length of the directory and plug it into
390 * the denode structure.
391 */
392 u_long size;
393
394 /*
395 * XXX Sometimes, these arrives that . entry have cluster
396 * number 0, when it shouldn't. Use real cluster number
397 * instead of what is written in directory entry.
398 */
399 if ((diroffset == 0) && (ldep->de_StartCluster != dirclust)) {
400 printf("deget(): . entry at clust %ld != %ld\n",
401 dirclust, ldep->de_StartCluster);
402 ldep->de_StartCluster = dirclust;
403 }
404
405 nvp->v_type = VDIR;
406 if (ldep->de_StartCluster != MSDOSFSROOT) {
4afd80f1 407 error = pcbmap(ldep, 0xffff, NULL, &size, NULL);
984263bc
MD
408 if (error == E2BIG) {
409 ldep->de_FileSize = de_cn2off(pmp, size);
410 error = 0;
411 } else
412 printf("deget(): pcbmap returned %d\n", error);
413 }
5fd012e0 414 } else {
984263bc 415 nvp->v_type = VREG;
5fd012e0 416 }
984263bc
MD
417 getmicrouptime(&tv);
418 SETHIGH(ldep->de_modrev, tv.tv_sec);
419 SETLOW(ldep->de_modrev, tv.tv_usec * 4294);
420 ldep->de_devvp = pmp->pm_devvp;
597aea93 421 vref(ldep->de_devvp);
1c843a13 422 vinitvmio(nvp, ldep->de_FileSize);
5fd012e0
MD
423 /*
424 * Leave nvp locked and refd so the returned inode is effectively
425 * locked and refd.
426 */
984263bc
MD
427 *depp = ldep;
428 return (0);
429}
430
431int
4625f023 432deupdat(struct denode *dep, int waitfor)
984263bc
MD
433{
434 int error;
435 struct buf *bp;
436 struct direntry *dirp;
437 struct timespec ts;
438
439 if (DETOV(dep)->v_mount->mnt_flag & MNT_RDONLY)
440 return (0);
441 getnanotime(&ts);
442 DETIMES(dep, &ts, &ts, &ts);
443 if ((dep->de_flag & DE_MODIFIED) == 0)
444 return (0);
445 dep->de_flag &= ~DE_MODIFIED;
446 if (dep->de_Attributes & ATTR_DIRECTORY)
447 return (0);
448 if (dep->de_refcnt <= 0)
449 return (0);
450 error = readde(dep, &bp, &dirp);
451 if (error)
452 return (error);
453 DE_EXTERNALIZE(dirp, dep);
454 if (waitfor)
455 return (bwrite(bp));
456 else {
457 bdwrite(bp);
458 return (0);
459 }
460}
461
462/*
463 * Truncate the file described by dep to the length specified by length.
464 */
465int
4625f023 466detrunc(struct denode *dep, u_long length, int flags, struct thread *td)
984263bc
MD
467{
468 int error;
469 int allerror;
470 u_long eofentry;
471 u_long chaintofree;
4afd80f1 472 daddr_t bn, cn;
984263bc
MD
473 int boff;
474 int isadir = dep->de_Attributes & ATTR_DIRECTORY;
475 struct buf *bp;
476 struct msdosfsmount *pmp = dep->de_pmp;
477
478#ifdef MSDOSFS_DEBUG
479 printf("detrunc(): file %s, length %lu, flags %x\n", dep->de_Name, length, flags);
480#endif
481
482 /*
483 * Disallow attempts to truncate the root directory since it is of
484 * fixed size. That's just the way dos filesystems are. We use
485 * the VROOT bit in the vnode because checking for the directory
486 * bit and a startcluster of 0 in the denode is not adequate to
487 * recognize the root directory at this point in a file or
488 * directory's life.
489 */
490 if ((DETOV(dep)->v_flag & VROOT) && !FAT32(pmp)) {
491 printf("detrunc(): can't truncate root directory, clust %ld, offset %ld\n",
492 dep->de_dirclust, dep->de_diroffset);
493 return (EINVAL);
494 }
495
496
497 if (dep->de_FileSize < length) {
498 vnode_pager_setsize(DETOV(dep), length);
3b568787 499 return deextend(dep, length);
984263bc
MD
500 }
501
502 /*
503 * If the desired length is 0 then remember the starting cluster of
504 * the file and set the StartCluster field in the directory entry
505 * to 0. If the desired length is not zero, then get the number of
506 * the last cluster in the shortened file. Then get the number of
507 * the first cluster in the part of the file that is to be freed.
508 * Then set the next cluster pointer in the last cluster of the
509 * file to CLUST_EOFE.
510 */
511 if (length == 0) {
512 chaintofree = dep->de_StartCluster;
513 dep->de_StartCluster = 0;
514 eofentry = ~0;
515 } else {
4afd80f1
MD
516 error = pcbmap(dep, de_clcount(pmp, length) - 1,
517 NULL, &eofentry, NULL);
984263bc
MD
518 if (error) {
519#ifdef MSDOSFS_DEBUG
520 printf("detrunc(): pcbmap fails %d\n", error);
521#endif
522 return (error);
523 }
524 }
525
526 fc_purge(dep, de_clcount(pmp, length));
527
528 /*
529 * If the new length is not a multiple of the cluster size then we
530 * must zero the tail end of the new last cluster in case it
531 * becomes part of the file again because of a seek.
532 */
533 if ((boff = length & pmp->pm_crbomask) != 0) {
534 if (isadir) {
4afd80f1 535 bn = xcntobn(pmp, eofentry);
54078292 536 error = bread(pmp->pm_devvp, de_bntodoff(pmp, bn), pmp->pm_bpcluster, &bp);
984263bc 537 } else {
4afd80f1
MD
538 cn = de_cluster(pmp, length);
539 error = bread(DETOV(dep), de_cn2doff(pmp, cn), pmp->pm_bpcluster, &bp);
984263bc
MD
540 }
541 if (error) {
542 brelse(bp);
543#ifdef MSDOSFS_DEBUG
544 printf("detrunc(): bread fails %d\n", error);
545#endif
546 return (error);
547 }
548 /*
549 * is this the right place for it?
550 */
551 bzero(bp->b_data + boff, pmp->pm_bpcluster - boff);
552 if (flags & IO_SYNC)
553 bwrite(bp);
554 else
555 bdwrite(bp);
556 }
557
558 /*
559 * Write out the updated directory entry. Even if the update fails
560 * we free the trailing clusters.
561 */
562 dep->de_FileSize = length;
563 if (!isadir)
564 dep->de_flag |= DE_UPDATE|DE_MODIFIED;
3b568787 565 allerror = vtruncbuf(DETOV(dep), td, length, pmp->pm_bpcluster);
984263bc
MD
566#ifdef MSDOSFS_DEBUG
567 if (allerror)
568 printf("detrunc(): vtruncbuf error %d\n", allerror);
569#endif
570 error = deupdat(dep, 1);
571 if (error && (allerror == 0))
572 allerror = error;
573#ifdef MSDOSFS_DEBUG
574 printf("detrunc(): allerror %d, eofentry %lu\n",
575 allerror, eofentry);
576#endif
577
578 /*
579 * If we need to break the cluster chain for the file then do it
580 * now.
581 */
582 if (eofentry != ~0) {
583 error = fatentry(FAT_GET_AND_SET, pmp, eofentry,
584 &chaintofree, CLUST_EOFE);
585 if (error) {
586#ifdef MSDOSFS_DEBUG
587 printf("detrunc(): fatentry errors %d\n", error);
588#endif
589 return (error);
590 }
591 fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1),
592 eofentry);
593 }
594
595 /*
596 * Now free the clusters removed from the file because of the
597 * truncation.
598 */
599 if (chaintofree != 0 && !MSDOSFSEOF(pmp, chaintofree))
600 freeclusterchain(pmp, chaintofree);
601
602 return (allerror);
603}
604
605/*
606 * Extend the file described by dep to length specified by length.
607 */
608int
4625f023 609deextend(struct denode *dep, u_long length)
984263bc
MD
610{
611 struct msdosfsmount *pmp = dep->de_pmp;
612 u_long count;
613 int error;
614
615 /*
616 * The root of a DOS filesystem cannot be extended.
617 */
618 if ((DETOV(dep)->v_flag & VROOT) && !FAT32(pmp))
619 return (EINVAL);
620
621 /*
622 * Directories cannot be extended.
623 */
624 if (dep->de_Attributes & ATTR_DIRECTORY)
625 return (EISDIR);
626
627 if (length <= dep->de_FileSize)
628 panic("deextend: file too large");
629
630 /*
631 * Compute the number of clusters to allocate.
632 */
633 count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize);
634 if (count > 0) {
635 if (count > pmp->pm_freeclustercount)
636 return (ENOSPC);
637 error = extendfile(dep, count, NULL, NULL, DE_CLEAR);
638 if (error) {
639 /* truncate the added clusters away again */
b1ce5639 640 detrunc(dep, dep->de_FileSize, 0, NULL);
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641 return (error);
642 }
643 }
644 dep->de_FileSize = length;
645 dep->de_flag |= DE_UPDATE|DE_MODIFIED;
646 return (deupdat(dep, 1));
647}
648
4625f023
CP
649/*
650 * msdosfs_reclaim(struct vnode *a_vp)
651 */
984263bc 652int
4625f023 653msdosfs_reclaim(struct vop_reclaim_args *ap)
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654{
655 struct vnode *vp = ap->a_vp;
656 struct denode *dep = VTODE(vp);
657
658#ifdef MSDOSFS_DEBUG
659 printf("msdosfs_reclaim(): dep %p, file %s, refcnt %ld\n",
3446c007 660 dep, dep ? dep->de_Name : "?", dep ? dep->de_refcnt : -1);
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661#endif
662
663 if (prtactive && vp->v_usecount != 0)
664 vprint("msdosfs_reclaim(): pushing active", vp);
665 /*
5fd012e0 666 * Remove the denode from its hash chain.
984263bc 667 */
984263bc 668 vp->v_data = NULL;
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669 if (dep) {
670 msdosfs_hashrem(dep);
671 if (dep->de_devvp) {
672 vrele(dep->de_devvp);
673 dep->de_devvp = 0;
674 }
675 free(dep, M_MSDOSFSNODE);
676 }
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677 return (0);
678}
679
4625f023
CP
680/*
681 * msdosfs_inactive(struct vnode *a_vp, struct thread *a_td)
682 */
984263bc 683int
4625f023 684msdosfs_inactive(struct vop_inactive_args *ap)
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685{
686 struct vnode *vp = ap->a_vp;
687 struct denode *dep = VTODE(vp);
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688 int error = 0;
689
690#ifdef MSDOSFS_DEBUG
691 printf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep, dep->de_Name[0]);
692#endif
693
694 if (prtactive && vp->v_usecount != 0)
695 vprint("msdosfs_inactive(): pushing active", vp);
696
697 /*
698 * Ignore denodes related to stale file handles.
699 */
700 if (dep->de_Name[0] == SLOT_DELETED)
701 goto out;
702
703 /*
704 * If the file has been deleted and it is on a read/write
705 * filesystem, then truncate the file, and mark the directory slot
706 * as empty. (This may not be necessary for the dos filesystem.)
707 */
708#ifdef MSDOSFS_DEBUG
709 printf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %x, MNT_RDONLY %x\n",
710 dep, dep->de_refcnt, vp->v_mount->mnt_flag, MNT_RDONLY);
711#endif
712 if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
3b568787 713 error = detrunc(dep, (u_long) 0, 0, ap->a_td);
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714 dep->de_flag |= DE_UPDATE;
715 dep->de_Name[0] = SLOT_DELETED;
716 }
717 deupdat(dep, 0);
718
719out:
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720 /*
721 * If we are done with the denode, reclaim it
722 * so that it can be reused immediately.
723 */
724#ifdef MSDOSFS_DEBUG
725 printf("msdosfs_inactive(): v_usecount %d, de_Name[0] %x\n", vp->v_usecount,
726 dep->de_Name[0]);
727#endif
728 if (dep->de_Name[0] == SLOT_DELETED)
5fd012e0 729 vrecycle(vp, ap->a_td);
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730 return (error);
731}