2/* $NetBSD: msdosfs_denode.c,v 1.28 1998/02/10 14:10:00 mrg Exp $ */
3
4/*-
5 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
6 * Copyright (C) 1994, 1995, 1997 TooLs GmbH.
7 * All rights reserved.
8 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by TooLs GmbH.
21 * 4. The name of TooLs GmbH may not be used to endorse or promote products
22 * derived from this software without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
27 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
29 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
30 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
31 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
32 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
33 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35/*-
36 * Written by Paul Popelka (paulp@uts.amdahl.com)
37 *
38 * You can do anything you want with this software, just don't say you wrote
39 * it, and don't remove this notice.
40 *
41 * This software is provided "as is".
42 *
43 * The author supplies this software to be publicly redistributed on the
44 * understanding that the author is not responsible for the correct
45 * functioning of this software in any circumstances and is not liable for
46 * any damages caused by this software.
47 *
48 * October 1992
49 */
50
51#include <sys/param.h>
52#include <sys/systm.h>
53#include <sys/buf.h>
54#include <sys/clock.h>
55#include <sys/kernel.h>
56#include <sys/malloc.h>
57#include <sys/mount.h>
58#include <sys/vnode.h>
59
60#include <vm/vm.h>
61#include <vm/vm_extern.h>
62
63#include <fs/msdosfs/bpb.h>
64#include <fs/msdosfs/direntry.h>
65#include <fs/msdosfs/denode.h>
66#include <fs/msdosfs/fat.h>
67#include <fs/msdosfs/msdosfsmount.h>
68
69static MALLOC_DEFINE(M_MSDOSFSNODE, "msdosfs_node", "MSDOSFS vnode private part");
70
71static int
72de_vncmpf(struct vnode *vp, void *arg)
73{
74 struct denode *de;
75 uint64_t *a;
76
77 a = arg;
78 de = VTODE(vp);
79 return (de->de_inode != *a);
80}
81
82/*
83 * If deget() succeeds it returns with the gotten denode locked().
84 *
85 * pmp - address of msdosfsmount structure of the filesystem containing
86 * the denode of interest. The address of
87 * the msdosfsmount structure are used.
88 * dirclust - which cluster bp contains, if dirclust is 0 (root directory)
89 * diroffset is relative to the beginning of the root directory,
90 * otherwise it is cluster relative.
91 * diroffset - offset past begin of cluster of denode we want
92 * depp - returns the address of the gotten denode.
93 */
94int
95deget(pmp, dirclust, diroffset, depp)
96 struct msdosfsmount *pmp; /* so we know the maj/min number */
97 u_long dirclust; /* cluster this dir entry came from */
98 u_long diroffset; /* index of entry within the cluster */
99 struct denode **depp; /* returns the addr of the gotten denode */
100{
101 int error;
102 uint64_t inode;
103 struct mount *mntp = pmp->pm_mountp;
104 struct direntry *direntptr;
105 struct denode *ldep;
106 struct vnode *nvp, *xvp;
107 struct buf *bp;
108
109#ifdef MSDOSFS_DEBUG
110 printf("deget(pmp %p, dirclust %lu, diroffset %lx, depp %p)\n",
111 pmp, dirclust, diroffset, depp);
112#endif
113
114 /*
115 * On FAT32 filesystems, root is a (more or less) normal
116 * directory
117 */
118 if (FAT32(pmp) && dirclust == MSDOSFSROOT)
119 dirclust = pmp->pm_rootdirblk;
120
121 /*
122 * See if the denode is in the denode cache. Use the location of
123 * the directory entry to compute the hash value. For subdir use
124 * address of "." entry. For root dir (if not FAT32) use cluster
125 * MSDOSFSROOT, offset MSDOSFSROOT_OFS
126 *
127 * NOTE: The check for de_refcnt > 0 below insures the denode being
128 * examined does not represent an unlinked but still open file.
129 * These files are not to be accessible even when the directory
130 * entry that represented the file happens to be reused while the
131 * deleted file is still open.
132 */
133 inode = (uint64_t)pmp->pm_bpcluster * dirclust + diroffset;
134
135 error = vfs_hash_get(mntp, inode, LK_EXCLUSIVE, curthread, &nvp,
136 de_vncmpf, &inode);
137 if (error)
138 return (error);
139 if (nvp != NULL) {
140 *depp = VTODE(nvp);
141 KASSERT((*depp)->de_dirclust == dirclust, ("wrong dirclust"));
142 KASSERT((*depp)->de_diroffset == diroffset, ("wrong diroffset"));
143 return (0);
144 }
145
146 /*
147 * Do the MALLOC before the getnewvnode since doing so afterward
148 * might cause a bogus v_data pointer to get dereferenced
149 * elsewhere if MALLOC should block.
150 */
151 ldep = malloc(sizeof(struct denode), M_MSDOSFSNODE, M_WAITOK);
152
153 /*
154 * Directory entry was not in cache, have to create a vnode and
155 * copy it from the passed disk buffer.
156 */
157 /* getnewvnode() does a VREF() on the vnode */
158 error = getnewvnode("msdosfs", mntp, &msdosfs_vnodeops, &nvp);
159 if (error) {
160 *depp = NULL;
161 free(ldep, M_MSDOSFSNODE);
162 return error;
163 }
164 bzero((caddr_t)ldep, sizeof *ldep);
165 nvp->v_data = ldep;
166 ldep->de_vnode = nvp;
167 ldep->de_flag = 0;
168 ldep->de_dirclust = dirclust;
169 ldep->de_diroffset = diroffset;
170 ldep->de_inode = inode;
| 2/* $NetBSD: msdosfs_denode.c,v 1.28 1998/02/10 14:10:00 mrg Exp $ */
3
4/*-
5 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
6 * Copyright (C) 1994, 1995, 1997 TooLs GmbH.
7 * All rights reserved.
8 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by TooLs GmbH.
21 * 4. The name of TooLs GmbH may not be used to endorse or promote products
22 * derived from this software without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
27 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
29 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
30 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
31 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
32 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
33 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35/*-
36 * Written by Paul Popelka (paulp@uts.amdahl.com)
37 *
38 * You can do anything you want with this software, just don't say you wrote
39 * it, and don't remove this notice.
40 *
41 * This software is provided "as is".
42 *
43 * The author supplies this software to be publicly redistributed on the
44 * understanding that the author is not responsible for the correct
45 * functioning of this software in any circumstances and is not liable for
46 * any damages caused by this software.
47 *
48 * October 1992
49 */
50
51#include <sys/param.h>
52#include <sys/systm.h>
53#include <sys/buf.h>
54#include <sys/clock.h>
55#include <sys/kernel.h>
56#include <sys/malloc.h>
57#include <sys/mount.h>
58#include <sys/vnode.h>
59
60#include <vm/vm.h>
61#include <vm/vm_extern.h>
62
63#include <fs/msdosfs/bpb.h>
64#include <fs/msdosfs/direntry.h>
65#include <fs/msdosfs/denode.h>
66#include <fs/msdosfs/fat.h>
67#include <fs/msdosfs/msdosfsmount.h>
68
69static MALLOC_DEFINE(M_MSDOSFSNODE, "msdosfs_node", "MSDOSFS vnode private part");
70
71static int
72de_vncmpf(struct vnode *vp, void *arg)
73{
74 struct denode *de;
75 uint64_t *a;
76
77 a = arg;
78 de = VTODE(vp);
79 return (de->de_inode != *a);
80}
81
82/*
83 * If deget() succeeds it returns with the gotten denode locked().
84 *
85 * pmp - address of msdosfsmount structure of the filesystem containing
86 * the denode of interest. The address of
87 * the msdosfsmount structure are used.
88 * dirclust - which cluster bp contains, if dirclust is 0 (root directory)
89 * diroffset is relative to the beginning of the root directory,
90 * otherwise it is cluster relative.
91 * diroffset - offset past begin of cluster of denode we want
92 * depp - returns the address of the gotten denode.
93 */
94int
95deget(pmp, dirclust, diroffset, depp)
96 struct msdosfsmount *pmp; /* so we know the maj/min number */
97 u_long dirclust; /* cluster this dir entry came from */
98 u_long diroffset; /* index of entry within the cluster */
99 struct denode **depp; /* returns the addr of the gotten denode */
100{
101 int error;
102 uint64_t inode;
103 struct mount *mntp = pmp->pm_mountp;
104 struct direntry *direntptr;
105 struct denode *ldep;
106 struct vnode *nvp, *xvp;
107 struct buf *bp;
108
109#ifdef MSDOSFS_DEBUG
110 printf("deget(pmp %p, dirclust %lu, diroffset %lx, depp %p)\n",
111 pmp, dirclust, diroffset, depp);
112#endif
113
114 /*
115 * On FAT32 filesystems, root is a (more or less) normal
116 * directory
117 */
118 if (FAT32(pmp) && dirclust == MSDOSFSROOT)
119 dirclust = pmp->pm_rootdirblk;
120
121 /*
122 * See if the denode is in the denode cache. Use the location of
123 * the directory entry to compute the hash value. For subdir use
124 * address of "." entry. For root dir (if not FAT32) use cluster
125 * MSDOSFSROOT, offset MSDOSFSROOT_OFS
126 *
127 * NOTE: The check for de_refcnt > 0 below insures the denode being
128 * examined does not represent an unlinked but still open file.
129 * These files are not to be accessible even when the directory
130 * entry that represented the file happens to be reused while the
131 * deleted file is still open.
132 */
133 inode = (uint64_t)pmp->pm_bpcluster * dirclust + diroffset;
134
135 error = vfs_hash_get(mntp, inode, LK_EXCLUSIVE, curthread, &nvp,
136 de_vncmpf, &inode);
137 if (error)
138 return (error);
139 if (nvp != NULL) {
140 *depp = VTODE(nvp);
141 KASSERT((*depp)->de_dirclust == dirclust, ("wrong dirclust"));
142 KASSERT((*depp)->de_diroffset == diroffset, ("wrong diroffset"));
143 return (0);
144 }
145
146 /*
147 * Do the MALLOC before the getnewvnode since doing so afterward
148 * might cause a bogus v_data pointer to get dereferenced
149 * elsewhere if MALLOC should block.
150 */
151 ldep = malloc(sizeof(struct denode), M_MSDOSFSNODE, M_WAITOK);
152
153 /*
154 * Directory entry was not in cache, have to create a vnode and
155 * copy it from the passed disk buffer.
156 */
157 /* getnewvnode() does a VREF() on the vnode */
158 error = getnewvnode("msdosfs", mntp, &msdosfs_vnodeops, &nvp);
159 if (error) {
160 *depp = NULL;
161 free(ldep, M_MSDOSFSNODE);
162 return error;
163 }
164 bzero((caddr_t)ldep, sizeof *ldep);
165 nvp->v_data = ldep;
166 ldep->de_vnode = nvp;
167 ldep->de_flag = 0;
168 ldep->de_dirclust = dirclust;
169 ldep->de_diroffset = diroffset;
170 ldep->de_inode = inode;
|
172 fc_purge(ldep, 0); /* init the fat cache for this denode */
173
174 lockmgr(nvp->v_vnlock, LK_EXCLUSIVE, NULL);
175 error = insmntque(nvp, mntp);
176 if (error != 0) {
177 free(ldep, M_MSDOSFSNODE);
178 *depp = NULL;
179 return (error);
180 }
181 error = vfs_hash_insert(nvp, inode, LK_EXCLUSIVE, curthread, &xvp,
182 de_vncmpf, &inode);
183 if (error) {
184 *depp = NULL;
185 return (error);
186 }
187 if (xvp != NULL) {
188 /* XXX: Not sure this is right */
189 nvp = xvp;
190 ldep->de_vnode = nvp;
191 }
192
193 ldep->de_pmp = pmp;
194 ldep->de_refcnt = 1;
195 /*
196 * Copy the directory entry into the denode area of the vnode.
197 */
198 if ((dirclust == MSDOSFSROOT
199 || (FAT32(pmp) && dirclust == pmp->pm_rootdirblk))
200 && diroffset == MSDOSFSROOT_OFS) {
201 /*
202 * Directory entry for the root directory. There isn't one,
203 * so we manufacture one. We should probably rummage
204 * through the root directory and find a label entry (if it
205 * exists), and then use the time and date from that entry
206 * as the time and date for the root denode.
207 */
208 nvp->v_vflag |= VV_ROOT; /* should be further down XXX */
209
210 ldep->de_Attributes = ATTR_DIRECTORY;
211 ldep->de_LowerCase = 0;
212 if (FAT32(pmp))
213 ldep->de_StartCluster = pmp->pm_rootdirblk;
214 /* de_FileSize will be filled in further down */
215 else {
216 ldep->de_StartCluster = MSDOSFSROOT;
217 ldep->de_FileSize = pmp->pm_rootdirsize * DEV_BSIZE;
218 }
219 /*
220 * fill in time and date so that fattime2timespec() doesn't
221 * spit up when called from msdosfs_getattr() with root
222 * denode
223 */
224 ldep->de_CHun = 0;
225 ldep->de_CTime = 0x0000; /* 00:00:00 */
226 ldep->de_CDate = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT)
227 | (1 << DD_DAY_SHIFT);
228 /* Jan 1, 1980 */
229 ldep->de_ADate = ldep->de_CDate;
230 ldep->de_MTime = ldep->de_CTime;
231 ldep->de_MDate = ldep->de_CDate;
232 /* leave the other fields as garbage */
233 } else {
234 error = readep(pmp, dirclust, diroffset, &bp, &direntptr);
235 if (error) {
236 /*
237 * The denode does not contain anything useful, so
238 * it would be wrong to leave it on its hash chain.
239 * Arrange for vput() to just forget about it.
240 */
241 ldep->de_Name[0] = SLOT_DELETED;
242
243 vput(nvp);
244 *depp = NULL;
245 return (error);
246 }
247 DE_INTERNALIZE(ldep, direntptr);
248 brelse(bp);
249 }
250
251 /*
252 * Fill in a few fields of the vnode and finish filling in the
253 * denode. Then return the address of the found denode.
254 */
255 if (ldep->de_Attributes & ATTR_DIRECTORY) {
256 /*
257 * Since DOS directory entries that describe directories
258 * have 0 in the filesize field, we take this opportunity
259 * to find out the length of the directory and plug it into
260 * the denode structure.
261 */
262 u_long size;
263
264 /*
265 * XXX it sometimes happens that the "." entry has cluster
266 * number 0 when it shouldn't. Use the actual cluster number
267 * instead of what is written in directory entry.
268 */
269 if (diroffset == 0 && ldep->de_StartCluster != dirclust) {
270 printf("deget(): \".\" entry at clust %lu != %lu\n",
271 dirclust, ldep->de_StartCluster);
272 ldep->de_StartCluster = dirclust;
273 }
274
275 nvp->v_type = VDIR;
276 if (ldep->de_StartCluster != MSDOSFSROOT) {
277 error = pcbmap(ldep, 0xffff, 0, &size, 0);
278 if (error == E2BIG) {
279 ldep->de_FileSize = de_cn2off(pmp, size);
280 error = 0;
281 } else
282 printf("deget(): pcbmap returned %d\n", error);
283 }
284 } else
285 nvp->v_type = VREG;
286 ldep->de_modrev = init_va_filerev();
287 *depp = ldep;
288 return (0);
289}
290
291int
292deupdat(dep, waitfor)
293 struct denode *dep;
294 int waitfor;
295{
296 int error;
297 struct buf *bp;
298 struct direntry *dirp;
299 struct timespec ts;
300
301 if (DETOV(dep)->v_mount->mnt_flag & MNT_RDONLY)
302 return (0);
303 getnanotime(&ts);
304 DETIMES(dep, &ts, &ts, &ts);
305 if ((dep->de_flag & DE_MODIFIED) == 0)
306 return (0);
307 dep->de_flag &= ~DE_MODIFIED;
308 if (dep->de_Attributes & ATTR_DIRECTORY)
309 return (0);
310 if (dep->de_refcnt <= 0)
311 return (0);
312 error = readde(dep, &bp, &dirp);
313 if (error)
314 return (error);
315 DE_EXTERNALIZE(dirp, dep);
316 if (waitfor)
317 return (bwrite(bp));
318 else {
319 bdwrite(bp);
320 return (0);
321 }
322}
323
324/*
325 * Truncate the file described by dep to the length specified by length.
326 */
327int
328detrunc(dep, length, flags, cred, td)
329 struct denode *dep;
330 u_long length;
331 int flags;
332 struct ucred *cred;
333 struct thread *td;
334{
335 int error;
336 int allerror;
337 u_long eofentry;
338 u_long chaintofree;
339 daddr_t bn;
340 int boff;
341 int isadir = dep->de_Attributes & ATTR_DIRECTORY;
342 struct buf *bp;
343 struct msdosfsmount *pmp = dep->de_pmp;
344
345#ifdef MSDOSFS_DEBUG
346 printf("detrunc(): file %s, length %lu, flags %x\n", dep->de_Name, length, flags);
347#endif
348
349 /*
350 * Disallow attempts to truncate the root directory since it is of
351 * fixed size. That's just the way dos filesystems are. We use
352 * the VROOT bit in the vnode because checking for the directory
353 * bit and a startcluster of 0 in the denode is not adequate to
354 * recognize the root directory at this point in a file or
355 * directory's life.
356 */
357 if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp)) {
358 printf("detrunc(): can't truncate root directory, clust %ld, offset %ld\n",
359 dep->de_dirclust, dep->de_diroffset);
360 return (EINVAL);
361 }
362
363 if (dep->de_FileSize < length) {
364 vnode_pager_setsize(DETOV(dep), length);
365 return deextend(dep, length, cred);
366 }
367
368 /*
369 * If the desired length is 0 then remember the starting cluster of
370 * the file and set the StartCluster field in the directory entry
371 * to 0. If the desired length is not zero, then get the number of
372 * the last cluster in the shortened file. Then get the number of
373 * the first cluster in the part of the file that is to be freed.
374 * Then set the next cluster pointer in the last cluster of the
375 * file to CLUST_EOFE.
376 */
377 if (length == 0) {
378 chaintofree = dep->de_StartCluster;
379 dep->de_StartCluster = 0;
380 eofentry = ~0;
381 } else {
382 error = pcbmap(dep, de_clcount(pmp, length) - 1, 0,
383 &eofentry, 0);
384 if (error) {
385#ifdef MSDOSFS_DEBUG
386 printf("detrunc(): pcbmap fails %d\n", error);
387#endif
388 return (error);
389 }
390 }
391
392 fc_purge(dep, de_clcount(pmp, length));
393
394 /*
395 * If the new length is not a multiple of the cluster size then we
396 * must zero the tail end of the new last cluster in case it
397 * becomes part of the file again because of a seek.
398 */
399 if ((boff = length & pmp->pm_crbomask) != 0) {
400 if (isadir) {
401 bn = cntobn(pmp, eofentry);
402 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster,
403 NOCRED, &bp);
404 if (error) {
405 brelse(bp);
406#ifdef MSDOSFS_DEBUG
407 printf("detrunc(): bread fails %d\n", error);
408#endif
409 return (error);
410 }
411 bzero(bp->b_data + boff, pmp->pm_bpcluster - boff);
412 if (flags & IO_SYNC)
413 bwrite(bp);
414 else
415 bdwrite(bp);
416 }
417 }
418
419 /*
420 * Write out the updated directory entry. Even if the update fails
421 * we free the trailing clusters.
422 */
423 dep->de_FileSize = length;
424 if (!isadir)
425 dep->de_flag |= DE_UPDATE | DE_MODIFIED;
426 allerror = vtruncbuf(DETOV(dep), cred, td, length, pmp->pm_bpcluster);
427#ifdef MSDOSFS_DEBUG
428 if (allerror)
429 printf("detrunc(): vtruncbuf error %d\n", allerror);
430#endif
431 error = deupdat(dep, !(DETOV(dep)->v_mount->mnt_flag & MNT_ASYNC));
432 if (error != 0 && allerror == 0)
433 allerror = error;
434#ifdef MSDOSFS_DEBUG
435 printf("detrunc(): allerror %d, eofentry %lu\n",
436 allerror, eofentry);
437#endif
438
439 /*
440 * If we need to break the cluster chain for the file then do it
441 * now.
442 */
443 if (eofentry != ~0) {
444 error = fatentry(FAT_GET_AND_SET, pmp, eofentry,
445 &chaintofree, CLUST_EOFE);
446 if (error) {
447#ifdef MSDOSFS_DEBUG
448 printf("detrunc(): fatentry errors %d\n", error);
449#endif
450 return (error);
451 }
452 fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1),
453 eofentry);
454 }
455
456 /*
457 * Now free the clusters removed from the file because of the
458 * truncation.
459 */
460 if (chaintofree != 0 && !MSDOSFSEOF(pmp, chaintofree))
461 freeclusterchain(pmp, chaintofree);
462
463 return (allerror);
464}
465
466/*
467 * Extend the file described by dep to length specified by length.
468 */
469int
470deextend(dep, length, cred)
471 struct denode *dep;
472 u_long length;
473 struct ucred *cred;
474{
475 struct msdosfsmount *pmp = dep->de_pmp;
476 u_long count;
477 int error;
478
479 /*
480 * The root of a DOS filesystem cannot be extended.
481 */
482 if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp))
483 return (EINVAL);
484
485 /*
486 * Directories cannot be extended.
487 */
488 if (dep->de_Attributes & ATTR_DIRECTORY)
489 return (EISDIR);
490
491 if (length <= dep->de_FileSize)
492 panic("deextend: file too large");
493
494 /*
495 * Compute the number of clusters to allocate.
496 */
497 count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize);
498 if (count > 0) {
499 if (count > pmp->pm_freeclustercount)
500 return (ENOSPC);
501 error = extendfile(dep, count, NULL, NULL, DE_CLEAR);
502 if (error) {
503 /* truncate the added clusters away again */
504 (void) detrunc(dep, dep->de_FileSize, 0, cred, NULL);
505 return (error);
506 }
507 }
508 dep->de_FileSize = length;
509 dep->de_flag |= DE_UPDATE | DE_MODIFIED;
510 return (deupdat(dep, !(DETOV(dep)->v_mount->mnt_flag & MNT_ASYNC)));
511}
512
513/*
514 * Move a denode to its correct hash queue after the file it represents has
515 * been moved to a new directory.
516 */
517void
518reinsert(dep)
519 struct denode *dep;
520{
521 struct vnode *vp;
522
523 /*
524 * Fix up the denode cache. If the denode is for a directory,
525 * there is nothing to do since the hash is based on the starting
526 * cluster of the directory file and that hasn't changed. If for a
527 * file the hash is based on the location of the directory entry,
528 * so we must remove it from the cache and re-enter it with the
529 * hash based on the new location of the directory entry.
530 */
531#if 0
532 if (dep->de_Attributes & ATTR_DIRECTORY)
533 return;
534#endif
535 vp = DETOV(dep);
536 dep->de_inode = (uint64_t)dep->de_pmp->pm_bpcluster * dep->de_dirclust +
537 dep->de_diroffset;
538 vfs_hash_rehash(vp, dep->de_inode);
539}
540
541int
542msdosfs_reclaim(ap)
543 struct vop_reclaim_args /* {
544 struct vnode *a_vp;
545 } */ *ap;
546{
547 struct vnode *vp = ap->a_vp;
548 struct denode *dep = VTODE(vp);
549
550#ifdef MSDOSFS_DEBUG
551 printf("msdosfs_reclaim(): dep %p, file %s, refcnt %ld\n",
552 dep, dep->de_Name, dep->de_refcnt);
553#endif
554
555 if (prtactive && vrefcnt(vp) != 0)
556 vprint("msdosfs_reclaim(): pushing active", vp);
557 /*
558 * Destroy the vm object and flush associated pages.
559 */
560 vnode_destroy_vobject(vp);
561 /*
562 * Remove the denode from its hash chain.
563 */
564 vfs_hash_remove(vp);
565 /*
566 * Purge old data structures associated with the denode.
567 */
568#if 0 /* XXX */
569 dep->de_flag = 0;
570#endif
571 free(dep, M_MSDOSFSNODE);
572 vp->v_data = NULL;
573
574 return (0);
575}
576
577int
578msdosfs_inactive(ap)
579 struct vop_inactive_args /* {
580 struct vnode *a_vp;
581 struct thread *a_td;
582 } */ *ap;
583{
584 struct vnode *vp = ap->a_vp;
585 struct denode *dep = VTODE(vp);
586 struct thread *td = ap->a_td;
587 int error = 0;
588
589#ifdef MSDOSFS_DEBUG
590 printf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep, dep->de_Name[0]);
591#endif
592
593 if (prtactive && vrefcnt(vp) != 0)
594 vprint("msdosfs_inactive(): pushing active", vp);
595
596 /*
597 * Ignore denodes related to stale file handles.
598 */
599 if (dep->de_Name[0] == SLOT_DELETED)
600 goto out;
601
602 /*
603 * If the file has been deleted and it is on a read/write
604 * filesystem, then truncate the file, and mark the directory slot
605 * as empty. (This may not be necessary for the dos filesystem.)
606 */
607#ifdef MSDOSFS_DEBUG
608 printf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %x, MNT_RDONLY %x\n",
609 dep, dep->de_refcnt, vp->v_mount->mnt_flag, MNT_RDONLY);
610#endif
611 if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
612 error = detrunc(dep, (u_long) 0, 0, NOCRED, td);
613 dep->de_flag |= DE_UPDATE;
614 dep->de_Name[0] = SLOT_DELETED;
615 }
616 deupdat(dep, 0);
617
618out:
619 /*
620 * If we are done with the denode, reclaim it
621 * so that it can be reused immediately.
622 */
623#ifdef MSDOSFS_DEBUG
624 printf("msdosfs_inactive(): v_usecount %d, de_Name[0] %x\n",
625 vrefcnt(vp), dep->de_Name[0]);
626#endif
627 if (dep->de_Name[0] == SLOT_DELETED)
628 vrecycle(vp, td);
629 return (error);
630}
| 171 fc_purge(ldep, 0); /* init the fat cache for this denode */
172
173 lockmgr(nvp->v_vnlock, LK_EXCLUSIVE, NULL);
174 error = insmntque(nvp, mntp);
175 if (error != 0) {
176 free(ldep, M_MSDOSFSNODE);
177 *depp = NULL;
178 return (error);
179 }
180 error = vfs_hash_insert(nvp, inode, LK_EXCLUSIVE, curthread, &xvp,
181 de_vncmpf, &inode);
182 if (error) {
183 *depp = NULL;
184 return (error);
185 }
186 if (xvp != NULL) {
187 /* XXX: Not sure this is right */
188 nvp = xvp;
189 ldep->de_vnode = nvp;
190 }
191
192 ldep->de_pmp = pmp;
193 ldep->de_refcnt = 1;
194 /*
195 * Copy the directory entry into the denode area of the vnode.
196 */
197 if ((dirclust == MSDOSFSROOT
198 || (FAT32(pmp) && dirclust == pmp->pm_rootdirblk))
199 && diroffset == MSDOSFSROOT_OFS) {
200 /*
201 * Directory entry for the root directory. There isn't one,
202 * so we manufacture one. We should probably rummage
203 * through the root directory and find a label entry (if it
204 * exists), and then use the time and date from that entry
205 * as the time and date for the root denode.
206 */
207 nvp->v_vflag |= VV_ROOT; /* should be further down XXX */
208
209 ldep->de_Attributes = ATTR_DIRECTORY;
210 ldep->de_LowerCase = 0;
211 if (FAT32(pmp))
212 ldep->de_StartCluster = pmp->pm_rootdirblk;
213 /* de_FileSize will be filled in further down */
214 else {
215 ldep->de_StartCluster = MSDOSFSROOT;
216 ldep->de_FileSize = pmp->pm_rootdirsize * DEV_BSIZE;
217 }
218 /*
219 * fill in time and date so that fattime2timespec() doesn't
220 * spit up when called from msdosfs_getattr() with root
221 * denode
222 */
223 ldep->de_CHun = 0;
224 ldep->de_CTime = 0x0000; /* 00:00:00 */
225 ldep->de_CDate = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT)
226 | (1 << DD_DAY_SHIFT);
227 /* Jan 1, 1980 */
228 ldep->de_ADate = ldep->de_CDate;
229 ldep->de_MTime = ldep->de_CTime;
230 ldep->de_MDate = ldep->de_CDate;
231 /* leave the other fields as garbage */
232 } else {
233 error = readep(pmp, dirclust, diroffset, &bp, &direntptr);
234 if (error) {
235 /*
236 * The denode does not contain anything useful, so
237 * it would be wrong to leave it on its hash chain.
238 * Arrange for vput() to just forget about it.
239 */
240 ldep->de_Name[0] = SLOT_DELETED;
241
242 vput(nvp);
243 *depp = NULL;
244 return (error);
245 }
246 DE_INTERNALIZE(ldep, direntptr);
247 brelse(bp);
248 }
249
250 /*
251 * Fill in a few fields of the vnode and finish filling in the
252 * denode. Then return the address of the found denode.
253 */
254 if (ldep->de_Attributes & ATTR_DIRECTORY) {
255 /*
256 * Since DOS directory entries that describe directories
257 * have 0 in the filesize field, we take this opportunity
258 * to find out the length of the directory and plug it into
259 * the denode structure.
260 */
261 u_long size;
262
263 /*
264 * XXX it sometimes happens that the "." entry has cluster
265 * number 0 when it shouldn't. Use the actual cluster number
266 * instead of what is written in directory entry.
267 */
268 if (diroffset == 0 && ldep->de_StartCluster != dirclust) {
269 printf("deget(): \".\" entry at clust %lu != %lu\n",
270 dirclust, ldep->de_StartCluster);
271 ldep->de_StartCluster = dirclust;
272 }
273
274 nvp->v_type = VDIR;
275 if (ldep->de_StartCluster != MSDOSFSROOT) {
276 error = pcbmap(ldep, 0xffff, 0, &size, 0);
277 if (error == E2BIG) {
278 ldep->de_FileSize = de_cn2off(pmp, size);
279 error = 0;
280 } else
281 printf("deget(): pcbmap returned %d\n", error);
282 }
283 } else
284 nvp->v_type = VREG;
285 ldep->de_modrev = init_va_filerev();
286 *depp = ldep;
287 return (0);
288}
289
290int
291deupdat(dep, waitfor)
292 struct denode *dep;
293 int waitfor;
294{
295 int error;
296 struct buf *bp;
297 struct direntry *dirp;
298 struct timespec ts;
299
300 if (DETOV(dep)->v_mount->mnt_flag & MNT_RDONLY)
301 return (0);
302 getnanotime(&ts);
303 DETIMES(dep, &ts, &ts, &ts);
304 if ((dep->de_flag & DE_MODIFIED) == 0)
305 return (0);
306 dep->de_flag &= ~DE_MODIFIED;
307 if (dep->de_Attributes & ATTR_DIRECTORY)
308 return (0);
309 if (dep->de_refcnt <= 0)
310 return (0);
311 error = readde(dep, &bp, &dirp);
312 if (error)
313 return (error);
314 DE_EXTERNALIZE(dirp, dep);
315 if (waitfor)
316 return (bwrite(bp));
317 else {
318 bdwrite(bp);
319 return (0);
320 }
321}
322
323/*
324 * Truncate the file described by dep to the length specified by length.
325 */
326int
327detrunc(dep, length, flags, cred, td)
328 struct denode *dep;
329 u_long length;
330 int flags;
331 struct ucred *cred;
332 struct thread *td;
333{
334 int error;
335 int allerror;
336 u_long eofentry;
337 u_long chaintofree;
338 daddr_t bn;
339 int boff;
340 int isadir = dep->de_Attributes & ATTR_DIRECTORY;
341 struct buf *bp;
342 struct msdosfsmount *pmp = dep->de_pmp;
343
344#ifdef MSDOSFS_DEBUG
345 printf("detrunc(): file %s, length %lu, flags %x\n", dep->de_Name, length, flags);
346#endif
347
348 /*
349 * Disallow attempts to truncate the root directory since it is of
350 * fixed size. That's just the way dos filesystems are. We use
351 * the VROOT bit in the vnode because checking for the directory
352 * bit and a startcluster of 0 in the denode is not adequate to
353 * recognize the root directory at this point in a file or
354 * directory's life.
355 */
356 if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp)) {
357 printf("detrunc(): can't truncate root directory, clust %ld, offset %ld\n",
358 dep->de_dirclust, dep->de_diroffset);
359 return (EINVAL);
360 }
361
362 if (dep->de_FileSize < length) {
363 vnode_pager_setsize(DETOV(dep), length);
364 return deextend(dep, length, cred);
365 }
366
367 /*
368 * If the desired length is 0 then remember the starting cluster of
369 * the file and set the StartCluster field in the directory entry
370 * to 0. If the desired length is not zero, then get the number of
371 * the last cluster in the shortened file. Then get the number of
372 * the first cluster in the part of the file that is to be freed.
373 * Then set the next cluster pointer in the last cluster of the
374 * file to CLUST_EOFE.
375 */
376 if (length == 0) {
377 chaintofree = dep->de_StartCluster;
378 dep->de_StartCluster = 0;
379 eofentry = ~0;
380 } else {
381 error = pcbmap(dep, de_clcount(pmp, length) - 1, 0,
382 &eofentry, 0);
383 if (error) {
384#ifdef MSDOSFS_DEBUG
385 printf("detrunc(): pcbmap fails %d\n", error);
386#endif
387 return (error);
388 }
389 }
390
391 fc_purge(dep, de_clcount(pmp, length));
392
393 /*
394 * If the new length is not a multiple of the cluster size then we
395 * must zero the tail end of the new last cluster in case it
396 * becomes part of the file again because of a seek.
397 */
398 if ((boff = length & pmp->pm_crbomask) != 0) {
399 if (isadir) {
400 bn = cntobn(pmp, eofentry);
401 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster,
402 NOCRED, &bp);
403 if (error) {
404 brelse(bp);
405#ifdef MSDOSFS_DEBUG
406 printf("detrunc(): bread fails %d\n", error);
407#endif
408 return (error);
409 }
410 bzero(bp->b_data + boff, pmp->pm_bpcluster - boff);
411 if (flags & IO_SYNC)
412 bwrite(bp);
413 else
414 bdwrite(bp);
415 }
416 }
417
418 /*
419 * Write out the updated directory entry. Even if the update fails
420 * we free the trailing clusters.
421 */
422 dep->de_FileSize = length;
423 if (!isadir)
424 dep->de_flag |= DE_UPDATE | DE_MODIFIED;
425 allerror = vtruncbuf(DETOV(dep), cred, td, length, pmp->pm_bpcluster);
426#ifdef MSDOSFS_DEBUG
427 if (allerror)
428 printf("detrunc(): vtruncbuf error %d\n", allerror);
429#endif
430 error = deupdat(dep, !(DETOV(dep)->v_mount->mnt_flag & MNT_ASYNC));
431 if (error != 0 && allerror == 0)
432 allerror = error;
433#ifdef MSDOSFS_DEBUG
434 printf("detrunc(): allerror %d, eofentry %lu\n",
435 allerror, eofentry);
436#endif
437
438 /*
439 * If we need to break the cluster chain for the file then do it
440 * now.
441 */
442 if (eofentry != ~0) {
443 error = fatentry(FAT_GET_AND_SET, pmp, eofentry,
444 &chaintofree, CLUST_EOFE);
445 if (error) {
446#ifdef MSDOSFS_DEBUG
447 printf("detrunc(): fatentry errors %d\n", error);
448#endif
449 return (error);
450 }
451 fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1),
452 eofentry);
453 }
454
455 /*
456 * Now free the clusters removed from the file because of the
457 * truncation.
458 */
459 if (chaintofree != 0 && !MSDOSFSEOF(pmp, chaintofree))
460 freeclusterchain(pmp, chaintofree);
461
462 return (allerror);
463}
464
465/*
466 * Extend the file described by dep to length specified by length.
467 */
468int
469deextend(dep, length, cred)
470 struct denode *dep;
471 u_long length;
472 struct ucred *cred;
473{
474 struct msdosfsmount *pmp = dep->de_pmp;
475 u_long count;
476 int error;
477
478 /*
479 * The root of a DOS filesystem cannot be extended.
480 */
481 if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp))
482 return (EINVAL);
483
484 /*
485 * Directories cannot be extended.
486 */
487 if (dep->de_Attributes & ATTR_DIRECTORY)
488 return (EISDIR);
489
490 if (length <= dep->de_FileSize)
491 panic("deextend: file too large");
492
493 /*
494 * Compute the number of clusters to allocate.
495 */
496 count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize);
497 if (count > 0) {
498 if (count > pmp->pm_freeclustercount)
499 return (ENOSPC);
500 error = extendfile(dep, count, NULL, NULL, DE_CLEAR);
501 if (error) {
502 /* truncate the added clusters away again */
503 (void) detrunc(dep, dep->de_FileSize, 0, cred, NULL);
504 return (error);
505 }
506 }
507 dep->de_FileSize = length;
508 dep->de_flag |= DE_UPDATE | DE_MODIFIED;
509 return (deupdat(dep, !(DETOV(dep)->v_mount->mnt_flag & MNT_ASYNC)));
510}
511
512/*
513 * Move a denode to its correct hash queue after the file it represents has
514 * been moved to a new directory.
515 */
516void
517reinsert(dep)
518 struct denode *dep;
519{
520 struct vnode *vp;
521
522 /*
523 * Fix up the denode cache. If the denode is for a directory,
524 * there is nothing to do since the hash is based on the starting
525 * cluster of the directory file and that hasn't changed. If for a
526 * file the hash is based on the location of the directory entry,
527 * so we must remove it from the cache and re-enter it with the
528 * hash based on the new location of the directory entry.
529 */
530#if 0
531 if (dep->de_Attributes & ATTR_DIRECTORY)
532 return;
533#endif
534 vp = DETOV(dep);
535 dep->de_inode = (uint64_t)dep->de_pmp->pm_bpcluster * dep->de_dirclust +
536 dep->de_diroffset;
537 vfs_hash_rehash(vp, dep->de_inode);
538}
539
540int
541msdosfs_reclaim(ap)
542 struct vop_reclaim_args /* {
543 struct vnode *a_vp;
544 } */ *ap;
545{
546 struct vnode *vp = ap->a_vp;
547 struct denode *dep = VTODE(vp);
548
549#ifdef MSDOSFS_DEBUG
550 printf("msdosfs_reclaim(): dep %p, file %s, refcnt %ld\n",
551 dep, dep->de_Name, dep->de_refcnt);
552#endif
553
554 if (prtactive && vrefcnt(vp) != 0)
555 vprint("msdosfs_reclaim(): pushing active", vp);
556 /*
557 * Destroy the vm object and flush associated pages.
558 */
559 vnode_destroy_vobject(vp);
560 /*
561 * Remove the denode from its hash chain.
562 */
563 vfs_hash_remove(vp);
564 /*
565 * Purge old data structures associated with the denode.
566 */
567#if 0 /* XXX */
568 dep->de_flag = 0;
569#endif
570 free(dep, M_MSDOSFSNODE);
571 vp->v_data = NULL;
572
573 return (0);
574}
575
576int
577msdosfs_inactive(ap)
578 struct vop_inactive_args /* {
579 struct vnode *a_vp;
580 struct thread *a_td;
581 } */ *ap;
582{
583 struct vnode *vp = ap->a_vp;
584 struct denode *dep = VTODE(vp);
585 struct thread *td = ap->a_td;
586 int error = 0;
587
588#ifdef MSDOSFS_DEBUG
589 printf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep, dep->de_Name[0]);
590#endif
591
592 if (prtactive && vrefcnt(vp) != 0)
593 vprint("msdosfs_inactive(): pushing active", vp);
594
595 /*
596 * Ignore denodes related to stale file handles.
597 */
598 if (dep->de_Name[0] == SLOT_DELETED)
599 goto out;
600
601 /*
602 * If the file has been deleted and it is on a read/write
603 * filesystem, then truncate the file, and mark the directory slot
604 * as empty. (This may not be necessary for the dos filesystem.)
605 */
606#ifdef MSDOSFS_DEBUG
607 printf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %x, MNT_RDONLY %x\n",
608 dep, dep->de_refcnt, vp->v_mount->mnt_flag, MNT_RDONLY);
609#endif
610 if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
611 error = detrunc(dep, (u_long) 0, 0, NOCRED, td);
612 dep->de_flag |= DE_UPDATE;
613 dep->de_Name[0] = SLOT_DELETED;
614 }
615 deupdat(dep, 0);
616
617out:
618 /*
619 * If we are done with the denode, reclaim it
620 * so that it can be reused immediately.
621 */
622#ifdef MSDOSFS_DEBUG
623 printf("msdosfs_inactive(): v_usecount %d, de_Name[0] %x\n",
624 vrefcnt(vp), dep->de_Name[0]);
625#endif
626 if (dep->de_Name[0] == SLOT_DELETED)
627 vrecycle(vp, td);
628 return (error);
629}
|