kernel - lwkt_token revamp
[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 $ */
7aade223 2/* $DragonFly: src/sys/vfs/msdosfs/msdosfs_denode.c,v 1.35 2008/06/08 07:56:06 nth 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
MD
73static MALLOC_DEFINE(M_MSDOSFSNODE, "MSDOSFS node", "MSDOSFS vnode private part");
74
629f33a7
NT
75/*
76 * Hash table caching denode instances.
77 *
78 * denodes are keyed by the disk location (cluster num, entry offset) of the
79 * directory entry of the file they represent.
80 *
81 * denodes representing deleted but still opened files are left in this cache
82 * until reclaimed. Deleted directory entries can be reused when files are
83 * renamed or new files created. As a consequence, several denodes associated
84 * with the same entry may coexist in this cache as long as a single one of
85 * them map to an existing file (de_refcnt > 0).
86 *
87 * R/w access to this cache is protected by dehash_token.
88 */
984263bc
MD
89static struct denode **dehashtbl;
90static u_long dehash; /* size of hash table - 1 */
91#define DEHASH(dev, dcl, doff) (dehashtbl[(minor(dev) + (dcl) + (doff) / \
92 sizeof(struct direntry)) & dehash])
8a8d5d85 93static struct lwkt_token dehash_token;
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94
95union _qcvt {
96 quad_t qcvt;
97 long val[2];
98};
99#define SETHIGH(q, h) { \
100 union _qcvt tmp; \
101 tmp.qcvt = (q); \
102 tmp.val[_QUAD_HIGHWORD] = (h); \
103 (q) = tmp.qcvt; \
104}
105#define SETLOW(q, l) { \
106 union _qcvt tmp; \
107 tmp.qcvt = (q); \
108 tmp.val[_QUAD_LOWWORD] = (l); \
109 (q) = tmp.qcvt; \
110}
111
112static struct denode *
b13267a5 113 msdosfs_hashget (cdev_t dev, u_long dirclust, u_long diroff);
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114
115/*ARGSUSED*/
116int
4625f023 117msdosfs_init(struct vfsconf *vfsp)
984263bc 118{
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MD
119 dehash = 16;
120 while (dehash < desiredvnodes)
121 dehash <<= 1;
efda3bd0 122 dehashtbl = kmalloc(sizeof(void *) * dehash, M_MSDOSFSMNT,
3446c007
MD
123 M_WAITOK|M_ZERO);
124 --dehash;
3b998fa9 125 lwkt_token_init(&dehash_token, 1);
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126 return (0);
127}
128
129int
4625f023 130msdosfs_uninit(struct vfsconf *vfsp)
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131{
132
133 if (dehashtbl)
efda3bd0 134 kfree(dehashtbl, M_MSDOSFSMNT);
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135 return (0);
136}
137
138static struct denode *
b13267a5 139msdosfs_hashget(cdev_t dev, u_long dirclust, u_long diroff)
984263bc 140{
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MD
141 struct denode *dep;
142 struct vnode *vp;
143
3b998fa9 144 lwkt_gettoken(&dehash_token);
984263bc 145loop:
984263bc 146 for (dep = DEHASH(dev, dirclust, diroff); dep; dep = dep->de_next) {
41a01a4d
MD
147 if (dirclust != dep->de_dirclust
148 || diroff != dep->de_diroffset
149 || dev != dep->de_dev
0640c404 150 || dep->de_refcnt <= 0) {
41a01a4d
MD
151 continue;
152 }
153 vp = DETOV(dep);
87de5057 154 if (vget(vp, LK_EXCLUSIVE))
5fd012e0 155 goto loop;
3446c007 156
41a01a4d
MD
157 /*
158 * We must check to see if the inode has been ripped
159 * out from under us after blocking.
160 */
161 for (dep = DEHASH(dev, dirclust, diroff); dep; dep = dep->de_next) {
162 if (dirclust == dep->de_dirclust
163 && diroff == dep->de_diroffset
164 && dev == dep->de_dev
0640c404 165 && dep->de_refcnt > 0) {
41a01a4d 166 break;
4954c633 167 }
984263bc 168 }
41a01a4d 169 if (dep == NULL || DETOV(dep) != vp) {
5fd012e0 170 vput(vp);
41a01a4d
MD
171 goto loop;
172 }
3b998fa9 173 lwkt_reltoken(&dehash_token);
41a01a4d 174 return (dep);
984263bc 175 }
3b998fa9 176 lwkt_reltoken(&dehash_token);
984263bc
MD
177 return (NULL);
178}
179
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NT
180/*
181 * Try to insert specified denode into the hash table. Return 0 on success
182 * and EBUSY if there is already a denode with the same key.
183 */
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184static
185int
4625f023 186msdosfs_hashins(struct denode *dep)
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MD
187{
188 struct denode **depp, *deq;
189
3b998fa9 190 lwkt_gettoken(&dehash_token);
984263bc 191 depp = &DEHASH(dep->de_dev, dep->de_dirclust, dep->de_diroffset);
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MD
192 while ((deq = *depp) != NULL) {
193 if (deq->de_dev == dep->de_dev &&
194 deq->de_dirclust == dep->de_dirclust &&
629f33a7
NT
195 deq->de_diroffset == dep->de_diroffset &&
196 deq->de_refcnt > 0) {
3b998fa9 197 lwkt_reltoken(&dehash_token);
629f33a7 198 return(EBUSY);
3446c007
MD
199 }
200 depp = &deq->de_next;
201 }
202 dep->de_next = NULL;
984263bc 203 *depp = dep;
3b998fa9 204 lwkt_reltoken(&dehash_token);
3446c007 205 return(0);
984263bc
MD
206}
207
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208static
209void
4625f023 210msdosfs_hashrem(struct denode *dep)
984263bc 211{
3446c007 212 struct denode **depp, *deq;
984263bc 213
3b998fa9 214 lwkt_gettoken(&dehash_token);
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MD
215 depp = &DEHASH(dep->de_dev, dep->de_dirclust, dep->de_diroffset);
216 while ((deq = *depp) != NULL) {
217 if (dep == deq)
218 break;
219 depp = &deq->de_next;
220 }
221 KKASSERT(dep == deq);
222 *depp = dep->de_next;
984263bc 223 dep->de_next = NULL;
3b998fa9 224 lwkt_reltoken(&dehash_token);
3446c007
MD
225}
226
227void
228msdosfs_reinsert(struct denode *ip, u_long new_dirclust, u_long new_diroffset)
229{
7aade223 230 int error;
3446c007 231
3b998fa9 232 lwkt_gettoken(&dehash_token);
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MD
233 msdosfs_hashrem(ip);
234 ip->de_dirclust = new_dirclust;
235 ip->de_diroffset = new_diroffset;
7aade223
NT
236 error = msdosfs_hashins(ip);
237 KASSERT(!error, ("msdosfs_reinsert: insertion failed %d", error));
3b998fa9 238 lwkt_reltoken(&dehash_token);
984263bc
MD
239}
240
241/*
242 * If deget() succeeds it returns with the gotten denode locked().
243 *
244 * pmp - address of msdosfsmount structure of the filesystem containing
245 * the denode of interest. The pm_dev field and the address of
246 * the msdosfsmount structure are used.
247 * dirclust - which cluster bp contains, if dirclust is 0 (root directory)
248 * diroffset is relative to the beginning of the root directory,
249 * otherwise it is cluster relative.
250 * diroffset - offset past begin of cluster of denode we want
251 * depp - returns the address of the gotten denode.
252 */
253int
4625f023
CP
254deget(struct msdosfsmount *pmp, /* so we know the maj/min number */
255 u_long dirclust, /* cluster this dir entry came from */
256 u_long diroffset, /* index of entry within the cluster */
257 struct denode **depp) /* returns the addr of the gotten denode */
984263bc
MD
258{
259 int error;
b13267a5 260 cdev_t dev = pmp->pm_dev;
984263bc
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261 struct mount *mntp = pmp->pm_mountp;
262 struct direntry *direntptr;
263 struct denode *ldep;
264 struct vnode *nvp;
265 struct buf *bp;
984263bc
MD
266 struct timeval tv;
267
268#ifdef MSDOSFS_DEBUG
086c1d7e 269 kprintf("deget(pmp %p, dirclust %lu, diroffset %lx, depp %p)\n",
984263bc
MD
270 pmp, dirclust, diroffset, depp);
271#endif
272
273 /*
274 * On FAT32 filesystems, root is a (more or less) normal
275 * directory
276 */
277 if (FAT32(pmp) && dirclust == MSDOSFSROOT)
278 dirclust = pmp->pm_rootdirblk;
279
3446c007 280again:
984263bc
MD
281 /*
282 * See if the denode is in the denode cache. Use the location of
283 * the directory entry to compute the hash value. For subdir use
284 * address of "." entry. For root dir (if not FAT32) use cluster
285 * MSDOSFSROOT, offset MSDOSFSROOT_OFS
286 *
287 * NOTE: The check for de_refcnt > 0 below insures the denode being
288 * examined does not represent an unlinked but still open file.
289 * These files are not to be accessible even when the directory
290 * entry that represented the file happens to be reused while the
291 * deleted file is still open.
292 */
293 ldep = msdosfs_hashget(dev, dirclust, diroffset);
294 if (ldep) {
295 *depp = ldep;
296 return (0);
297 }
298
299 /*
300 * Do the MALLOC before the getnewvnode since doing so afterward
301 * might cause a bogus v_data pointer to get dereferenced
302 * elsewhere if MALLOC should block.
303 */
1037af13
NT
304 MALLOC(ldep, struct denode *, sizeof(struct denode), M_MSDOSFSNODE,
305 M_WAITOK | M_ZERO);
984263bc
MD
306
307 /*
308 * Directory entry was not in cache, have to create a vnode and
309 * copy it from the passed disk buffer.
310 */
3446c007 311
597aea93 312 /* getnewvnode() does a vref() on the vnode */
6ddb7618 313 error = getnewvnode(VT_MSDOSFS, mntp, &nvp, VLKTIMEOUT, 0);
984263bc
MD
314 if (error) {
315 *depp = NULL;
316 FREE(ldep, M_MSDOSFSNODE);
317 return error;
318 }
3446c007 319
984263bc
MD
320 ldep->de_vnode = nvp;
321 ldep->de_flag = 0;
322 ldep->de_devvp = 0;
323 ldep->de_dev = dev;
324 ldep->de_dirclust = dirclust;
325 ldep->de_diroffset = diroffset;
326 fc_purge(ldep, 0); /* init the fat cache for this denode */
327
328 /*
3446c007
MD
329 * Insert the denode into the hash queue. If a collision occurs
330 * throw away the vnode and try again.
984263bc 331 */
bf6a1c3b
MD
332 error = msdosfs_hashins(ldep);
333 if (error == EBUSY) {
986e7cda 334 nvp->v_type = VBAD;
5fd012e0 335 vx_put(nvp);
efda3bd0 336 kfree(ldep, M_MSDOSFSNODE);
3446c007 337 goto again;
bf6a1c3b
MD
338 } else if (error) {
339 nvp->v_type = VBAD;
340 vx_put(nvp);
341 kfree(ldep, M_MSDOSFSNODE);
47d87cf2 342 *depp = NULL;
bf6a1c3b 343 return (EINVAL);
3446c007
MD
344 }
345 nvp->v_data = ldep;
984263bc
MD
346 ldep->de_pmp = pmp;
347 ldep->de_refcnt = 1;
348 /*
349 * Copy the directory entry into the denode area of the vnode.
350 */
351 if ((dirclust == MSDOSFSROOT
352 || (FAT32(pmp) && dirclust == pmp->pm_rootdirblk))
353 && diroffset == MSDOSFSROOT_OFS) {
354 /*
355 * Directory entry for the root directory. There isn't one,
356 * so we manufacture one. We should probably rummage
357 * through the root directory and find a label entry (if it
358 * exists), and then use the time and date from that entry
359 * as the time and date for the root denode.
360 */
2247fe02 361 vsetflags(nvp, VROOT); /* should be further down XXX */
984263bc
MD
362
363 ldep->de_Attributes = ATTR_DIRECTORY;
364 ldep->de_LowerCase = 0;
365 if (FAT32(pmp))
366 ldep->de_StartCluster = pmp->pm_rootdirblk;
367 /* de_FileSize will be filled in further down */
368 else {
369 ldep->de_StartCluster = MSDOSFSROOT;
370 ldep->de_FileSize = pmp->pm_rootdirsize * DEV_BSIZE;
371 }
372 /*
373 * fill in time and date so that dos2unixtime() doesn't
374 * spit up when called from msdosfs_getattr() with root
375 * denode
376 */
377 ldep->de_CHun = 0;
378 ldep->de_CTime = 0x0000; /* 00:00:00 */
379 ldep->de_CDate = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT)
380 | (1 << DD_DAY_SHIFT);
381 /* Jan 1, 1980 */
382 ldep->de_ADate = ldep->de_CDate;
383 ldep->de_MTime = ldep->de_CTime;
384 ldep->de_MDate = ldep->de_CDate;
385 /* leave the other fields as garbage */
386 } else {
387 error = readep(pmp, dirclust, diroffset, &bp, &direntptr);
388 if (error) {
389 /*
390 * The denode does not contain anything useful, so
391 * it would be wrong to leave it on its hash chain.
392 * Arrange for vput() to just forget about it.
393 */
394 ldep->de_Name[0] = SLOT_DELETED;
986e7cda 395 nvp->v_type = VBAD;
984263bc 396
5fd012e0 397 vx_put(nvp);
984263bc
MD
398 *depp = NULL;
399 return (error);
400 }
401 DE_INTERNALIZE(ldep, direntptr);
402 brelse(bp);
403 }
404
405 /*
406 * Fill in a few fields of the vnode and finish filling in the
407 * denode. Then return the address of the found denode.
408 */
409 if (ldep->de_Attributes & ATTR_DIRECTORY) {
410 /*
411 * Since DOS directory entries that describe directories
412 * have 0 in the filesize field, we take this opportunity
413 * to find out the length of the directory and plug it into
414 * the denode structure.
415 */
416 u_long size;
417
418 /*
419 * XXX Sometimes, these arrives that . entry have cluster
420 * number 0, when it shouldn't. Use real cluster number
421 * instead of what is written in directory entry.
422 */
423 if ((diroffset == 0) && (ldep->de_StartCluster != dirclust)) {
086c1d7e 424 kprintf("deget(): . entry at clust %ld != %ld\n",
984263bc
MD
425 dirclust, ldep->de_StartCluster);
426 ldep->de_StartCluster = dirclust;
427 }
428
429 nvp->v_type = VDIR;
430 if (ldep->de_StartCluster != MSDOSFSROOT) {
4afd80f1 431 error = pcbmap(ldep, 0xffff, NULL, &size, NULL);
984263bc
MD
432 if (error == E2BIG) {
433 ldep->de_FileSize = de_cn2off(pmp, size);
434 error = 0;
435 } else
086c1d7e 436 kprintf("deget(): pcbmap returned %d\n", error);
984263bc 437 }
5fd012e0 438 } else {
984263bc 439 nvp->v_type = VREG;
5fd012e0 440 }
984263bc
MD
441 getmicrouptime(&tv);
442 SETHIGH(ldep->de_modrev, tv.tv_sec);
443 SETLOW(ldep->de_modrev, tv.tv_usec * 4294);
444 ldep->de_devvp = pmp->pm_devvp;
597aea93 445 vref(ldep->de_devvp);
b0d18f7d 446 vinitvmio(nvp, ldep->de_FileSize, PAGE_SIZE, -1);
5fd012e0
MD
447 /*
448 * Leave nvp locked and refd so the returned inode is effectively
449 * locked and refd.
450 */
984263bc
MD
451 *depp = ldep;
452 return (0);
453}
454
455int
4625f023 456deupdat(struct denode *dep, int waitfor)
984263bc
MD
457{
458 int error;
459 struct buf *bp;
460 struct direntry *dirp;
461 struct timespec ts;
462
463 if (DETOV(dep)->v_mount->mnt_flag & MNT_RDONLY)
464 return (0);
465 getnanotime(&ts);
466 DETIMES(dep, &ts, &ts, &ts);
467 if ((dep->de_flag & DE_MODIFIED) == 0)
468 return (0);
469 dep->de_flag &= ~DE_MODIFIED;
470 if (dep->de_Attributes & ATTR_DIRECTORY)
471 return (0);
472 if (dep->de_refcnt <= 0)
473 return (0);
474 error = readde(dep, &bp, &dirp);
475 if (error)
476 return (error);
477 DE_EXTERNALIZE(dirp, dep);
478 if (waitfor)
479 return (bwrite(bp));
480 else {
481 bdwrite(bp);
482 return (0);
483 }
484}
485
486/*
487 * Truncate the file described by dep to the length specified by length.
488 */
489int
87de5057 490detrunc(struct denode *dep, u_long length, int flags)
984263bc
MD
491{
492 int error;
493 int allerror;
494 u_long eofentry;
495 u_long chaintofree;
4afd80f1 496 daddr_t bn, cn;
984263bc
MD
497 int boff;
498 int isadir = dep->de_Attributes & ATTR_DIRECTORY;
499 struct buf *bp;
500 struct msdosfsmount *pmp = dep->de_pmp;
501
502#ifdef MSDOSFS_DEBUG
086c1d7e 503 kprintf("detrunc(): file %s, length %lu, flags %x\n", dep->de_Name, length, flags);
984263bc
MD
504#endif
505
506 /*
507 * Disallow attempts to truncate the root directory since it is of
508 * fixed size. That's just the way dos filesystems are. We use
509 * the VROOT bit in the vnode because checking for the directory
510 * bit and a startcluster of 0 in the denode is not adequate to
511 * recognize the root directory at this point in a file or
512 * directory's life.
513 */
514 if ((DETOV(dep)->v_flag & VROOT) && !FAT32(pmp)) {
086c1d7e 515 kprintf("detrunc(): can't truncate root directory, clust %ld, offset %ld\n",
984263bc
MD
516 dep->de_dirclust, dep->de_diroffset);
517 return (EINVAL);
518 }
519
520
521 if (dep->de_FileSize < length) {
522 vnode_pager_setsize(DETOV(dep), length);
3b568787 523 return deextend(dep, length);
984263bc
MD
524 }
525
526 /*
527 * If the desired length is 0 then remember the starting cluster of
528 * the file and set the StartCluster field in the directory entry
529 * to 0. If the desired length is not zero, then get the number of
530 * the last cluster in the shortened file. Then get the number of
531 * the first cluster in the part of the file that is to be freed.
532 * Then set the next cluster pointer in the last cluster of the
533 * file to CLUST_EOFE.
534 */
535 if (length == 0) {
536 chaintofree = dep->de_StartCluster;
537 dep->de_StartCluster = 0;
538 eofentry = ~0;
539 } else {
4afd80f1
MD
540 error = pcbmap(dep, de_clcount(pmp, length) - 1,
541 NULL, &eofentry, NULL);
984263bc
MD
542 if (error) {
543#ifdef MSDOSFS_DEBUG
086c1d7e 544 kprintf("detrunc(): pcbmap fails %d\n", error);
984263bc
MD
545#endif
546 return (error);
547 }
548 }
549
550 fc_purge(dep, de_clcount(pmp, length));
551
552 /*
553 * If the new length is not a multiple of the cluster size then we
554 * must zero the tail end of the new last cluster in case it
555 * becomes part of the file again because of a seek.
556 */
557 if ((boff = length & pmp->pm_crbomask) != 0) {
558 if (isadir) {
4afd80f1 559 bn = xcntobn(pmp, eofentry);
54078292 560 error = bread(pmp->pm_devvp, de_bntodoff(pmp, bn), pmp->pm_bpcluster, &bp);
984263bc 561 } else {
4afd80f1
MD
562 cn = de_cluster(pmp, length);
563 error = bread(DETOV(dep), de_cn2doff(pmp, cn), pmp->pm_bpcluster, &bp);
984263bc
MD
564 }
565 if (error) {
566 brelse(bp);
567#ifdef MSDOSFS_DEBUG
086c1d7e 568 kprintf("detrunc(): bread fails %d\n", error);
984263bc
MD
569#endif
570 return (error);
571 }
572 /*
573 * is this the right place for it?
574 */
575 bzero(bp->b_data + boff, pmp->pm_bpcluster - boff);
576 if (flags & IO_SYNC)
577 bwrite(bp);
578 else
579 bdwrite(bp);
580 }
581
582 /*
583 * Write out the updated directory entry. Even if the update fails
584 * we free the trailing clusters.
585 */
586 dep->de_FileSize = length;
587 if (!isadir)
588 dep->de_flag |= DE_UPDATE|DE_MODIFIED;
87de5057 589 allerror = vtruncbuf(DETOV(dep), length, pmp->pm_bpcluster);
984263bc
MD
590#ifdef MSDOSFS_DEBUG
591 if (allerror)
086c1d7e 592 kprintf("detrunc(): vtruncbuf error %d\n", allerror);
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593#endif
594 error = deupdat(dep, 1);
595 if (error && (allerror == 0))
596 allerror = error;
597#ifdef MSDOSFS_DEBUG
086c1d7e 598 kprintf("detrunc(): allerror %d, eofentry %lu\n",
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599 allerror, eofentry);
600#endif
601
602 /*
603 * If we need to break the cluster chain for the file then do it
604 * now.
605 */
606 if (eofentry != ~0) {
607 error = fatentry(FAT_GET_AND_SET, pmp, eofentry,
608 &chaintofree, CLUST_EOFE);
609 if (error) {
610#ifdef MSDOSFS_DEBUG
086c1d7e 611 kprintf("detrunc(): fatentry errors %d\n", error);
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612#endif
613 return (error);
614 }
615 fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1),
616 eofentry);
617 }
618
619 /*
620 * Now free the clusters removed from the file because of the
621 * truncation.
622 */
623 if (chaintofree != 0 && !MSDOSFSEOF(pmp, chaintofree))
624 freeclusterchain(pmp, chaintofree);
625
626 return (allerror);
627}
628
629/*
630 * Extend the file described by dep to length specified by length.
631 */
632int
4625f023 633deextend(struct denode *dep, u_long length)
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634{
635 struct msdosfsmount *pmp = dep->de_pmp;
636 u_long count;
637 int error;
638
639 /*
640 * The root of a DOS filesystem cannot be extended.
641 */
642 if ((DETOV(dep)->v_flag & VROOT) && !FAT32(pmp))
643 return (EINVAL);
644
645 /*
646 * Directories cannot be extended.
647 */
648 if (dep->de_Attributes & ATTR_DIRECTORY)
649 return (EISDIR);
650
651 if (length <= dep->de_FileSize)
652 panic("deextend: file too large");
653
654 /*
655 * Compute the number of clusters to allocate.
656 */
657 count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize);
658 if (count > 0) {
659 if (count > pmp->pm_freeclustercount)
660 return (ENOSPC);
661 error = extendfile(dep, count, NULL, NULL, DE_CLEAR);
662 if (error) {
663 /* truncate the added clusters away again */
87de5057 664 detrunc(dep, dep->de_FileSize, 0);
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665 return (error);
666 }
667 }
668 dep->de_FileSize = length;
669 dep->de_flag |= DE_UPDATE|DE_MODIFIED;
670 return (deupdat(dep, 1));
671}
672
673/*
4625f023
CP
674 * msdosfs_reclaim(struct vnode *a_vp)
675 */
984263bc 676int
4625f023 677msdosfs_reclaim(struct vop_reclaim_args *ap)
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678{
679 struct vnode *vp = ap->a_vp;
680 struct denode *dep = VTODE(vp);
681
682#ifdef MSDOSFS_DEBUG
086c1d7e 683 kprintf("msdosfs_reclaim(): dep %p, file %s, refcnt %ld\n",
1ffae7f1 684 dep, dep ? (char *)dep->de_Name : "?", dep ? dep->de_refcnt : -1);
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685#endif
686
3c37c940 687 if (prtactive && vp->v_sysref.refcnt > 1)
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688 vprint("msdosfs_reclaim(): pushing active", vp);
689 /*
5fd012e0 690 * Remove the denode from its hash chain.
984263bc 691 */
984263bc 692 vp->v_data = NULL;
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MD
693 if (dep) {
694 msdosfs_hashrem(dep);
695 if (dep->de_devvp) {
696 vrele(dep->de_devvp);
697 dep->de_devvp = 0;
698 }
efda3bd0 699 kfree(dep, M_MSDOSFSNODE);
3446c007 700 }
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701 return (0);
702}
703
4625f023 704/*
b478fdce 705 * msdosfs_inactive(struct vnode *a_vp)
4625f023 706 */
984263bc 707int
4625f023 708msdosfs_inactive(struct vop_inactive_args *ap)
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709{
710 struct vnode *vp = ap->a_vp;
711 struct denode *dep = VTODE(vp);
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712 int error = 0;
713
714#ifdef MSDOSFS_DEBUG
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715 kprintf("msdosfs_inactive(): dep %p, de_Name[0] %x\n",
716 dep, (dep ? dep->de_Name[0] : 0));
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717#endif
718
3c37c940 719 if (prtactive && vp->v_sysref.refcnt > 1)
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720 vprint("msdosfs_inactive(): pushing active", vp);
721
722 /*
723 * Ignore denodes related to stale file handles.
724 */
e0ab0dda 725 if (dep == NULL || dep->de_Name[0] == SLOT_DELETED)
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726 goto out;
727
728 /*
729 * If the file has been deleted and it is on a read/write
730 * filesystem, then truncate the file, and mark the directory slot
731 * as empty. (This may not be necessary for the dos filesystem.)
732 */
733#ifdef MSDOSFS_DEBUG
086c1d7e 734 kprintf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %x, MNT_RDONLY %x\n",
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735 dep, dep->de_refcnt, vp->v_mount->mnt_flag, MNT_RDONLY);
736#endif
737 if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
87de5057 738 error = detrunc(dep, (u_long) 0, 0);
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739 dep->de_flag |= DE_UPDATE;
740 dep->de_Name[0] = SLOT_DELETED;
741 }
742 deupdat(dep, 0);
743
744out:
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745 /*
746 * If we are done with the denode, reclaim it
747 * so that it can be reused immediately.
748 */
749#ifdef MSDOSFS_DEBUG
3c37c940 750 kprintf("msdosfs_inactive(): v_sysrefs %d, de_Name[0] %x\n",
0ab5e0c9 751 vp->v_sysref.refcnt, (dep ? dep->de_Name[0] : 0));
984263bc 752#endif
e0ab0dda 753 if (dep == NULL || dep->de_Name[0] == SLOT_DELETED)
87de5057 754 vrecycle(vp);
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755 return (error);
756}