1 /* $NetBSD: msdosfs_vnops.c,v 1.93 2015/04/04 12:34:44 riastradh Exp $ */
2
3 /*-
4 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
5 * Copyright (C) 1994, 1995, 1997 TooLs GmbH.
6 * All rights reserved.
7 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by TooLs GmbH.
20 * 4. The name of TooLs GmbH may not be used to endorse or promote products
21 * derived from this software without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
27 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
28 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
29 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
30 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
31 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
32 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 */
34 /*
35 * Written by Paul Popelka (paulp@uts.amdahl.com)
36 *
37 * You can do anything you want with this software, just don't say you wrote
38 * it, and don't remove this notice.
39 *
40 * This software is provided "as is".
41 *
42 * The author supplies this software to be publicly redistributed on the
43 * understanding that the author is not responsible for the correct
44 * functioning of this software in any circumstances and is not liable for
45 * any damages caused by this software.
46 *
47 * October 1992
48 */
49
50 #include <sys/cdefs.h>
51 __KERNEL_RCSID(0, "$NetBSD: msdosfs_vnops.c,v 1.93 2015/04/04 12:34:44 riastradh Exp $");
52
53 #include <sys/param.h>
54 #include <sys/systm.h>
55 #include <sys/namei.h>
56 #include <sys/resourcevar.h> /* defines plimit structure in proc struct */
57 #include <sys/kernel.h>
58 #include <sys/file.h> /* define FWRITE ... */
59 #include <sys/stat.h>
60 #include <sys/buf.h>
61 #include <sys/proc.h>
62 #include <sys/mount.h>
63 #include <sys/fstrans.h>
64 #include <sys/vnode.h>
65 #include <sys/signalvar.h>
66 #include <sys/malloc.h>
67 #include <sys/dirent.h>
68 #include <sys/lockf.h>
69 #include <sys/kauth.h>
70
71 #include <miscfs/genfs/genfs.h>
72 #include <miscfs/specfs/specdev.h> /* XXX */ /* defines v_rdev */
73
74 #include <uvm/uvm_extern.h>
75
76 #include <fs/msdosfs/bpb.h>
77 #include <fs/msdosfs/direntry.h>
78 #include <fs/msdosfs/denode.h>
79 #include <fs/msdosfs/msdosfsmount.h>
80 #include <fs/msdosfs/fat.h>
81
82 /*
83 * Some general notes:
84 *
85 * In the ufs filesystem the inodes, superblocks, and indirect blocks are
86 * read/written using the vnode for the filesystem. Blocks that represent
87 * the contents of a file are read/written using the vnode for the file
88 * (including directories when they are read/written as files). This
89 * presents problems for the dos filesystem because data that should be in
90 * an inode (if dos had them) resides in the directory itself. Since we
91 * must update directory entries without the benefit of having the vnode
92 * for the directory we must use the vnode for the filesystem. This means
93 * that when a directory is actually read/written (via read, write, or
94 * readdir, or seek) we must use the vnode for the filesystem instead of
95 * the vnode for the directory as would happen in ufs. This is to insure we
96 * retrieve the correct block from the buffer cache since the hash value is
97 * based upon the vnode address and the desired block number.
98 */
99
100 /*
101 * Create a regular file. On entry the directory to contain the file being
102 * created is locked. We must release before we return.
103 */
104 int
msdosfs_create(void * v)105 msdosfs_create(void *v)
106 {
107 struct vop_create_v3_args /* {
108 struct vnode *a_dvp;
109 struct vnode **a_vpp;
110 struct componentname *a_cnp;
111 struct vattr *a_vap;
112 } */ *ap = v;
113 struct componentname *cnp = ap->a_cnp;
114 struct denode ndirent;
115 struct denode *dep;
116 struct denode *pdep = VTODE(ap->a_dvp);
117 int error;
118
119 #ifdef MSDOSFS_DEBUG
120 printf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap);
121 #endif
122
123 fstrans_start(ap->a_dvp->v_mount, FSTRANS_SHARED);
124 /*
125 * If this is the root directory and there is no space left we
126 * can't do anything. This is because the root directory can not
127 * change size.
128 */
129 if (pdep->de_StartCluster == MSDOSFSROOT
130 && pdep->de_fndoffset >= pdep->de_FileSize) {
131 error = ENOSPC;
132 goto bad;
133 }
134
135 /*
136 * Create a directory entry for the file, then call createde() to
137 * have it installed. NOTE: DOS files are always executable. We
138 * use the absence of the owner write bit to make the file
139 * readonly.
140 */
141 memset(&ndirent, 0, sizeof(ndirent));
142 if ((error = uniqdosname(pdep, cnp, ndirent.de_Name)) != 0)
143 goto bad;
144
145 ndirent.de_Attributes = (ap->a_vap->va_mode & S_IWUSR) ?
146 ATTR_ARCHIVE : ATTR_ARCHIVE | ATTR_READONLY;
147 ndirent.de_StartCluster = 0;
148 ndirent.de_FileSize = 0;
149 ndirent.de_dev = pdep->de_dev;
150 ndirent.de_devvp = pdep->de_devvp;
151 ndirent.de_pmp = pdep->de_pmp;
152 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE;
153 DETIMES(&ndirent, NULL, NULL, NULL, pdep->de_pmp->pm_gmtoff);
154 if ((error = createde(&ndirent, pdep, &dep, cnp)) != 0)
155 goto bad;
156 fstrans_done(ap->a_dvp->v_mount);
157 VN_KNOTE(ap->a_dvp, NOTE_WRITE);
158 *ap->a_vpp = DETOV(dep);
159 return (0);
160
161 bad:
162 fstrans_done(ap->a_dvp->v_mount);
163 return (error);
164 }
165
166 int
msdosfs_close(void * v)167 msdosfs_close(void *v)
168 {
169 struct vop_close_args /* {
170 struct vnode *a_vp;
171 int a_fflag;
172 kauth_cred_t a_cred;
173 } */ *ap = v;
174 struct vnode *vp = ap->a_vp;
175 struct denode *dep = VTODE(vp);
176
177 fstrans_start(vp->v_mount, FSTRANS_SHARED);
178 mutex_enter(vp->v_interlock);
179 if (vp->v_usecount > 1)
180 DETIMES(dep, NULL, NULL, NULL, dep->de_pmp->pm_gmtoff);
181 mutex_exit(vp->v_interlock);
182 fstrans_done(vp->v_mount);
183 return (0);
184 }
185
186 static int
msdosfs_check_possible(struct vnode * vp,struct denode * dep,mode_t mode)187 msdosfs_check_possible(struct vnode *vp, struct denode *dep, mode_t mode)
188 {
189
190 /*
191 * Disallow write attempts on read-only file systems;
192 * unless the file is a socket, fifo, or a block or
193 * character device resident on the file system.
194 */
195 if (mode & VWRITE) {
196 switch (vp->v_type) {
197 case VDIR:
198 case VLNK:
199 case VREG:
200 if (vp->v_mount->mnt_flag & MNT_RDONLY)
201 return (EROFS);
202 default:
203 break;
204 }
205 }
206
207 return 0;
208 }
209
210 static int
msdosfs_check_permitted(struct vnode * vp,struct denode * dep,mode_t mode,kauth_cred_t cred)211 msdosfs_check_permitted(struct vnode *vp, struct denode *dep, mode_t mode,
212 kauth_cred_t cred)
213 {
214 struct msdosfsmount *pmp = dep->de_pmp;
215 mode_t file_mode;
216
217 if ((dep->de_Attributes & ATTR_READONLY) == 0)
218 file_mode = S_IRWXU|S_IRWXG|S_IRWXO;
219 else
220 file_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
221
222 file_mode &= (vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask);
223
224 return kauth_authorize_vnode(cred, KAUTH_ACCESS_ACTION(mode,
225 vp->v_type, file_mode), vp, NULL, genfs_can_access(vp->v_type,
226 file_mode, pmp->pm_uid, pmp->pm_gid, mode, cred));
227 }
228
229 int
msdosfs_access(void * v)230 msdosfs_access(void *v)
231 {
232 struct vop_access_args /* {
233 struct vnode *a_vp;
234 int a_mode;
235 kauth_cred_t a_cred;
236 } */ *ap = v;
237 struct vnode *vp = ap->a_vp;
238 struct denode *dep = VTODE(vp);
239 int error;
240
241 error = msdosfs_check_possible(vp, dep, ap->a_mode);
242 if (error)
243 return error;
244
245 error = msdosfs_check_permitted(vp, dep, ap->a_mode, ap->a_cred);
246
247 return error;
248 }
249
250 int
msdosfs_getattr(void * v)251 msdosfs_getattr(void *v)
252 {
253 struct vop_getattr_args /* {
254 struct vnode *a_vp;
255 struct vattr *a_vap;
256 kauth_cred_t a_cred;
257 } */ *ap = v;
258 struct denode *dep = VTODE(ap->a_vp);
259 struct msdosfsmount *pmp = dep->de_pmp;
260 struct vattr *vap = ap->a_vap;
261 mode_t mode;
262 u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry);
263 ino_t fileid;
264
265 fstrans_start(ap->a_vp->v_mount, FSTRANS_SHARED);
266 DETIMES(dep, NULL, NULL, NULL, pmp->pm_gmtoff);
267 vap->va_fsid = dep->de_dev;
268 /*
269 * The following computation of the fileid must be the same as that
270 * used in msdosfs_readdir() to compute d_fileno. If not, pwd
271 * doesn't work.
272 */
273 if (dep->de_Attributes & ATTR_DIRECTORY) {
274 fileid = cntobn(pmp, (ino_t)dep->de_StartCluster) * dirsperblk;
275 if (dep->de_StartCluster == MSDOSFSROOT)
276 fileid = 1;
277 } else {
278 fileid = cntobn(pmp, (ino_t)dep->de_dirclust) * dirsperblk;
279 if (dep->de_dirclust == MSDOSFSROOT)
280 fileid = roottobn(pmp, 0) * dirsperblk;
281 fileid += dep->de_diroffset / sizeof(struct direntry);
282 }
283 vap->va_fileid = fileid;
284 if ((dep->de_Attributes & ATTR_READONLY) == 0)
285 mode = S_IRWXU|S_IRWXG|S_IRWXO;
286 else
287 mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
288 vap->va_mode =
289 mode & (ap->a_vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask);
290 vap->va_uid = pmp->pm_uid;
291 vap->va_gid = pmp->pm_gid;
292 vap->va_nlink = 1;
293 vap->va_rdev = 0;
294 vap->va_size = ap->a_vp->v_size;
295 dos2unixtime(dep->de_MDate, dep->de_MTime, 0, pmp->pm_gmtoff,
296 &vap->va_mtime);
297 if (dep->de_pmp->pm_flags & MSDOSFSMNT_LONGNAME) {
298 dos2unixtime(dep->de_ADate, 0, 0, pmp->pm_gmtoff,
299 &vap->va_atime);
300 dos2unixtime(dep->de_CDate, dep->de_CTime, dep->de_CHun,
301 pmp->pm_gmtoff, &vap->va_ctime);
302 } else {
303 vap->va_atime = vap->va_mtime;
304 vap->va_ctime = vap->va_mtime;
305 }
306 vap->va_flags = 0;
307 if ((dep->de_Attributes & ATTR_ARCHIVE) == 0) {
308 vap->va_flags |= SF_ARCHIVED;
309 vap->va_mode |= S_ARCH1;
310 }
311 vap->va_gen = 0;
312 vap->va_blocksize = pmp->pm_bpcluster;
313 vap->va_bytes =
314 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask;
315 vap->va_type = ap->a_vp->v_type;
316 fstrans_done(ap->a_vp->v_mount);
317 return (0);
318 }
319
320 int
msdosfs_setattr(void * v)321 msdosfs_setattr(void *v)
322 {
323 struct vop_setattr_args /* {
324 struct vnode *a_vp;
325 struct vattr *a_vap;
326 kauth_cred_t a_cred;
327 } */ *ap = v;
328 int error = 0, de_changed = 0;
329 struct denode *dep = VTODE(ap->a_vp);
330 struct msdosfsmount *pmp = dep->de_pmp;
331 struct vnode *vp = ap->a_vp;
332 struct vattr *vap = ap->a_vap;
333 kauth_cred_t cred = ap->a_cred;
334
335 #ifdef MSDOSFS_DEBUG
336 printf("msdosfs_setattr(): vp %p, vap %p, cred %p\n",
337 ap->a_vp, vap, cred);
338 #endif
339 /*
340 * Note we silently ignore uid or gid changes.
341 */
342 if ((vap->va_type != VNON) || (vap->va_nlink != (nlink_t)VNOVAL) ||
343 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
344 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
345 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL) ||
346 (vap->va_uid != VNOVAL && vap->va_uid != pmp->pm_uid) ||
347 (vap->va_gid != VNOVAL && vap->va_gid != pmp->pm_gid)) {
348 #ifdef MSDOSFS_DEBUG
349 printf("msdosfs_setattr(): returning EINVAL\n");
350 printf(" va_type %d, va_nlink %x, va_fsid %"PRIx64", va_fileid %llx\n",
351 vap->va_type, vap->va_nlink, vap->va_fsid,
352 (unsigned long long)vap->va_fileid);
353 printf(" va_blocksize %lx, va_rdev %"PRIx64", va_bytes %"PRIx64", va_gen %lx\n",
354 vap->va_blocksize, vap->va_rdev, vap->va_bytes, vap->va_gen);
355 #endif
356 return (EINVAL);
357 }
358 /*
359 * Silently ignore attributes modifications on directories.
360 */
361 if (ap->a_vp->v_type == VDIR)
362 return 0;
363
364 fstrans_start(vp->v_mount, FSTRANS_SHARED);
365 if (vap->va_size != VNOVAL) {
366 if (vp->v_mount->mnt_flag & MNT_RDONLY) {
367 error = EROFS;
368 goto bad;
369 }
370 error = detrunc(dep, (u_long)vap->va_size, 0, cred);
371 if (error)
372 goto bad;
373 de_changed = 1;
374 }
375 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
376 if (vp->v_mount->mnt_flag & MNT_RDONLY) {
377 error = EROFS;
378 goto bad;
379 }
380 error = kauth_authorize_vnode(cred, KAUTH_VNODE_WRITE_TIMES,
381 ap->a_vp, NULL, genfs_can_chtimes(ap->a_vp, vap->va_vaflags,
382 pmp->pm_uid, cred));
383 if (error)
384 goto bad;
385 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 &&
386 vap->va_atime.tv_sec != VNOVAL)
387 unix2dostime(&vap->va_atime, pmp->pm_gmtoff, &dep->de_ADate, NULL, NULL);
388 if (vap->va_mtime.tv_sec != VNOVAL)
389 unix2dostime(&vap->va_mtime, pmp->pm_gmtoff, &dep->de_MDate, &dep->de_MTime, NULL);
390 dep->de_Attributes |= ATTR_ARCHIVE;
391 dep->de_flag |= DE_MODIFIED;
392 de_changed = 1;
393 }
394 /*
395 * DOS files only have the ability to have their writability
396 * attribute set, so we use the owner write bit to set the readonly
397 * attribute.
398 */
399 if (vap->va_mode != (mode_t)VNOVAL) {
400 if (vp->v_mount->mnt_flag & MNT_RDONLY) {
401 error = EROFS;
402 goto bad;
403 }
404 error = kauth_authorize_vnode(cred, KAUTH_VNODE_WRITE_FLAGS, vp,
405 NULL, genfs_can_chflags(cred, vp->v_type, pmp->pm_uid, false));
406 if (error)
407 goto bad;
408 /* We ignore the read and execute bits. */
409 if (vap->va_mode & S_IWUSR)
410 dep->de_Attributes &= ~ATTR_READONLY;
411 else
412 dep->de_Attributes |= ATTR_READONLY;
413 dep->de_flag |= DE_MODIFIED;
414 de_changed = 1;
415 }
416 /*
417 * Allow the `archived' bit to be toggled.
418 */
419 if (vap->va_flags != VNOVAL) {
420 if (vp->v_mount->mnt_flag & MNT_RDONLY) {
421 error = EROFS;
422 goto bad;
423 }
424 error = kauth_authorize_vnode(cred, KAUTH_VNODE_WRITE_FLAGS, vp,
425 NULL, genfs_can_chflags(cred, vp->v_type, pmp->pm_uid, false));
426 if (error)
427 goto bad;
428 if (vap->va_flags & SF_ARCHIVED)
429 dep->de_Attributes &= ~ATTR_ARCHIVE;
430 else
431 dep->de_Attributes |= ATTR_ARCHIVE;
432 dep->de_flag |= DE_MODIFIED;
433 de_changed = 1;
434 }
435
436 if (de_changed) {
437 VN_KNOTE(vp, NOTE_ATTRIB);
438 error = deupdat(dep, 1);
439 if (error)
440 goto bad;
441 }
442
443 bad:
444 fstrans_done(vp->v_mount);
445 return error;
446 }
447
448 int
msdosfs_read(void * v)449 msdosfs_read(void *v)
450 {
451 struct vop_read_args /* {
452 struct vnode *a_vp;
453 struct uio *a_uio;
454 int a_ioflag;
455 kauth_cred_t a_cred;
456 } */ *ap = v;
457 int error = 0;
458 int64_t diff;
459 int blsize;
460 long n;
461 long on;
462 daddr_t lbn;
463 vsize_t bytelen;
464 struct buf *bp;
465 struct vnode *vp = ap->a_vp;
466 struct denode *dep = VTODE(vp);
467 struct msdosfsmount *pmp = dep->de_pmp;
468 struct uio *uio = ap->a_uio;
469
470 /*
471 * If they didn't ask for any data, then we are done.
472 */
473
474 if (uio->uio_resid == 0)
475 return (0);
476 if (uio->uio_offset < 0)
477 return (EINVAL);
478 if (uio->uio_offset >= dep->de_FileSize)
479 return (0);
480
481 fstrans_start(vp->v_mount, FSTRANS_SHARED);
482 if (vp->v_type == VREG) {
483 const int advice = IO_ADV_DECODE(ap->a_ioflag);
484
485 while (uio->uio_resid > 0) {
486 bytelen = MIN(dep->de_FileSize - uio->uio_offset,
487 uio->uio_resid);
488
489 if (bytelen == 0)
490 break;
491 error = ubc_uiomove(&vp->v_uobj, uio, bytelen, advice,
492 UBC_READ | UBC_PARTIALOK | UBC_UNMAP_FLAG(vp));
493 if (error)
494 break;
495 }
496 dep->de_flag |= DE_ACCESS;
497 goto out;
498 }
499
500 /* this loop is only for directories now */
501 do {
502 lbn = de_cluster(pmp, uio->uio_offset);
503 on = uio->uio_offset & pmp->pm_crbomask;
504 n = MIN(pmp->pm_bpcluster - on, uio->uio_resid);
505 if (uio->uio_offset >= dep->de_FileSize) {
506 fstrans_done(vp->v_mount);
507 return (0);
508 }
509 /* file size (and hence diff) may be up to 4GB */
510 diff = dep->de_FileSize - uio->uio_offset;
511 if (diff < n)
512 n = (long) diff;
513
514 /* convert cluster # to sector # */
515 error = pcbmap(dep, lbn, &lbn, 0, &blsize);
516 if (error)
517 goto bad;
518
519 /*
520 * If we are operating on a directory file then be sure to
521 * do i/o with the vnode for the filesystem instead of the
522 * vnode for the directory.
523 */
524 error = bread(pmp->pm_devvp, de_bn2kb(pmp, lbn), blsize,
525 0, &bp);
526 if (error) {
527 goto bad;
528 }
529 n = MIN(n, pmp->pm_bpcluster - bp->b_resid);
530 error = uiomove((char *)bp->b_data + on, (int) n, uio);
531 brelse(bp, 0);
532 } while (error == 0 && uio->uio_resid > 0 && n != 0);
533
534 out:
535 if ((ap->a_ioflag & IO_SYNC) == IO_SYNC) {
536 int uerror;
537
538 uerror = deupdat(dep, 1);
539 if (error == 0)
540 error = uerror;
541 }
542 bad:
543 fstrans_done(vp->v_mount);
544 return (error);
545 }
546
547 /*
548 * Write data to a file or directory.
549 */
550 int
msdosfs_write(void * v)551 msdosfs_write(void *v)
552 {
553 struct vop_write_args /* {
554 struct vnode *a_vp;
555 struct uio *a_uio;
556 int a_ioflag;
557 kauth_cred_t a_cred;
558 } */ *ap = v;
559 int resid, extended = 0;
560 int error = 0;
561 int ioflag = ap->a_ioflag;
562 u_long osize;
563 u_long count;
564 vsize_t bytelen;
565 off_t oldoff;
566 size_t rem;
567 struct uio *uio = ap->a_uio;
568 struct vnode *vp = ap->a_vp;
569 struct denode *dep = VTODE(vp);
570 struct msdosfsmount *pmp = dep->de_pmp;
571 kauth_cred_t cred = ap->a_cred;
572 bool async;
573
574 #ifdef MSDOSFS_DEBUG
575 printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n",
576 vp, uio, ioflag, cred);
577 printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n",
578 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster);
579 #endif
580
581 switch (vp->v_type) {
582 case VREG:
583 if (ioflag & IO_APPEND)
584 uio->uio_offset = dep->de_FileSize;
585 break;
586 case VDIR:
587 return EISDIR;
588 default:
589 panic("msdosfs_write(): bad file type");
590 }
591
592 if (uio->uio_offset < 0)
593 return (EINVAL);
594
595 if (uio->uio_resid == 0)
596 return (0);
597
598 /* Don't bother to try to write files larger than the fs limit */
599 if (uio->uio_offset + uio->uio_resid > MSDOSFS_FILESIZE_MAX)
600 return (EFBIG);
601
602 fstrans_start(vp->v_mount, FSTRANS_SHARED);
603 /*
604 * If the offset we are starting the write at is beyond the end of
605 * the file, then they've done a seek. Unix filesystems allow
606 * files with holes in them, DOS doesn't so we must fill the hole
607 * with zeroed blocks.
608 */
609 if (uio->uio_offset > dep->de_FileSize) {
610 if ((error = deextend(dep, uio->uio_offset, cred)) != 0) {
611 fstrans_done(vp->v_mount);
612 return (error);
613 }
614 }
615
616 /*
617 * Remember some values in case the write fails.
618 */
619 async = vp->v_mount->mnt_flag & MNT_ASYNC;
620 resid = uio->uio_resid;
621 osize = dep->de_FileSize;
622
623 /*
624 * If we write beyond the end of the file, extend it to its ultimate
625 * size ahead of the time to hopefully get a contiguous area.
626 */
627 if (uio->uio_offset + resid > osize) {
628 count = de_clcount(pmp, uio->uio_offset + resid) -
629 de_clcount(pmp, osize);
630 if ((error = extendfile(dep, count, NULL, NULL, 0)))
631 goto errexit;
632
633 dep->de_FileSize = uio->uio_offset + resid;
634 /* hint uvm to not read in extended part */
635 uvm_vnp_setwritesize(vp, dep->de_FileSize);
636 /* zero out the remainder of the last page */
637 rem = round_page(dep->de_FileSize) - dep->de_FileSize;
638 if (rem > 0)
639 ubc_zerorange(&vp->v_uobj, (off_t)dep->de_FileSize,
640 rem, UBC_UNMAP_FLAG(vp));
641 extended = 1;
642 }
643
644 do {
645 oldoff = uio->uio_offset;
646 bytelen = uio->uio_resid;
647
648 error = ubc_uiomove(&vp->v_uobj, uio, bytelen,
649 IO_ADV_DECODE(ioflag), UBC_WRITE | UBC_UNMAP_FLAG(vp));
650 if (error)
651 break;
652
653 /*
654 * flush what we just wrote if necessary.
655 * XXXUBC simplistic async flushing.
656 */
657
658 if (!async && oldoff >> 16 != uio->uio_offset >> 16) {
659 mutex_enter(vp->v_interlock);
660 error = VOP_PUTPAGES(vp, (oldoff >> 16) << 16,
661 (uio->uio_offset >> 16) << 16,
662 PGO_CLEANIT | PGO_LAZY);
663 }
664 } while (error == 0 && uio->uio_resid > 0);
665
666 /* set final size */
667 uvm_vnp_setsize(vp, dep->de_FileSize);
668 if (error == 0 && ioflag & IO_SYNC) {
669 mutex_enter(vp->v_interlock);
670 error = VOP_PUTPAGES(vp, trunc_page(oldoff),
671 round_page(oldoff + bytelen), PGO_CLEANIT | PGO_SYNCIO);
672 }
673 dep->de_flag |= DE_UPDATE;
674
675 /*
676 * If the write failed and they want us to, truncate the file back
677 * to the size it was before the write was attempted.
678 */
679 errexit:
680 if (resid > uio->uio_resid)
681 VN_KNOTE(vp, NOTE_WRITE | (extended ? NOTE_EXTEND : 0));
682 if (error) {
683 detrunc(dep, osize, ioflag & IO_SYNC, NOCRED);
684 uio->uio_offset -= resid - uio->uio_resid;
685 uio->uio_resid = resid;
686 } else if ((ioflag & IO_SYNC) == IO_SYNC)
687 error = deupdat(dep, 1);
688 fstrans_done(vp->v_mount);
689 KASSERT(vp->v_size == dep->de_FileSize);
690 return (error);
691 }
692
693 int
msdosfs_update(struct vnode * vp,const struct timespec * acc,const struct timespec * mod,int flags)694 msdosfs_update(struct vnode *vp, const struct timespec *acc,
695 const struct timespec *mod, int flags)
696 {
697 struct buf *bp;
698 struct direntry *dirp;
699 struct denode *dep;
700 int error;
701
702 if (vp->v_mount->mnt_flag & MNT_RDONLY)
703 return (0);
704 dep = VTODE(vp);
705 DETIMES(dep, acc, mod, NULL, dep->de_pmp->pm_gmtoff);
706 if ((dep->de_flag & DE_MODIFIED) == 0)
707 return (0);
708 dep->de_flag &= ~DE_MODIFIED;
709 if (dep->de_Attributes & ATTR_DIRECTORY)
710 return (0);
711 if (dep->de_refcnt <= 0)
712 return (0);
713 error = readde(dep, &bp, &dirp);
714 if (error)
715 return (error);
716 DE_EXTERNALIZE(dirp, dep);
717 if (flags & (UPDATE_WAIT|UPDATE_DIROP))
718 return (bwrite(bp));
719 else {
720 bdwrite(bp);
721 return (0);
722 }
723 }
724
725 /*
726 * Flush the blocks of a file to disk.
727 *
728 * This function is worthless for vnodes that represent directories. Maybe we
729 * could just do a sync if they try an fsync on a directory file.
730 */
731 int
msdosfs_remove(void * v)732 msdosfs_remove(void *v)
733 {
734 struct vop_remove_args /* {
735 struct vnode *a_dvp;
736 struct vnode *a_vp;
737 struct componentname *a_cnp;
738 } */ *ap = v;
739 struct denode *dep = VTODE(ap->a_vp);
740 struct denode *ddep = VTODE(ap->a_dvp);
741 int error;
742
743 fstrans_start(ap->a_dvp->v_mount, FSTRANS_SHARED);
744 if (ap->a_vp->v_type == VDIR)
745 error = EPERM;
746 else
747 error = removede(ddep, dep);
748 #ifdef MSDOSFS_DEBUG
749 printf("msdosfs_remove(), dep %p, v_usecount %d\n",
750 dep, ap->a_vp->v_usecount);
751 #endif
752 VN_KNOTE(ap->a_vp, NOTE_DELETE);
753 VN_KNOTE(ap->a_dvp, NOTE_WRITE);
754 if (ddep == dep)
755 vrele(ap->a_vp);
756 else
757 vput(ap->a_vp); /* causes msdosfs_inactive() to be called
758 * via vrele() */
759 vput(ap->a_dvp);
760 fstrans_done(ap->a_dvp->v_mount);
761 return (error);
762 }
763
764 /*
765 * Renames on files require moving the denode to a new hash queue since the
766 * denode's location is used to compute which hash queue to put the file
767 * in. Unless it is a rename in place. For example "mv a b".
768 *
769 * What follows is the basic algorithm:
770 *
771 * if (file move) {
772 * if (dest file exists) {
773 * remove dest file
774 * }
775 * if (dest and src in same directory) {
776 * rewrite name in existing directory slot
777 * } else {
778 * write new entry in dest directory
779 * update offset and dirclust in denode
780 * move denode to new hash chain
781 * clear old directory entry
782 * }
783 * } else {
784 * directory move
785 * if (dest directory exists) {
786 * if (dest is not empty) {
787 * return ENOTEMPTY
788 * }
789 * remove dest directory
790 * }
791 * if (dest and src in same directory) {
792 * rewrite name in existing entry
793 * } else {
794 * be sure dest is not a child of src directory
795 * write entry in dest directory
796 * update "." and ".." in moved directory
797 * update offset and dirclust in denode
798 * move denode to new hash chain
799 * clear old directory entry for moved directory
800 * }
801 * }
802 *
803 * On entry:
804 * source's parent directory is unlocked
805 * source file or directory is unlocked
806 * destination's parent directory is locked
807 * destination file or directory is locked if it exists
808 *
809 * On exit:
810 * all denodes should be released
811 *
812 * Notes:
813 * I'm not sure how the memory containing the pathnames pointed at by the
814 * componentname structures is freed, there may be some memory bleeding
815 * for each rename done.
816 *
817 * --More-- Notes:
818 * This routine needs help. badly.
819 */
820 int
msdosfs_rename(void * v)821 msdosfs_rename(void *v)
822 {
823 struct vop_rename_args /* {
824 struct vnode *a_fdvp;
825 struct vnode *a_fvp;
826 struct componentname *a_fcnp;
827 struct vnode *a_tdvp;
828 struct vnode *a_tvp;
829 struct componentname *a_tcnp;
830 } */ *ap = v;
831 struct vnode *tvp = ap->a_tvp;
832 struct vnode *tdvp = ap->a_tdvp;
833 struct vnode *fvp = ap->a_fvp;
834 struct vnode *fdvp = ap->a_fdvp;
835 struct mount *mp = fdvp->v_mount;
836 struct componentname *tcnp = ap->a_tcnp;
837 struct componentname *fcnp = ap->a_fcnp;
838 struct denode *ip, *xp, *dp, *zp;
839 u_char toname[12], oldname[12];
840 u_long from_diroffset, to_diroffset;
841 u_char to_count;
842 int doingdirectory = 0, newparent = 0;
843 int error;
844 u_long cn;
845 daddr_t bn;
846 struct msdosfsmount *pmp;
847 struct direntry *dotdotp;
848 struct buf *bp;
849
850 pmp = VFSTOMSDOSFS(fdvp->v_mount);
851
852 /*
853 * Check for cross-device rename.
854 */
855 if ((fvp->v_mount != tdvp->v_mount) ||
856 (tvp && (fvp->v_mount != tvp->v_mount))) {
857 error = EXDEV;
858 abortit:
859 VOP_ABORTOP(tdvp, tcnp);
860 if (tdvp == tvp)
861 vrele(tdvp);
862 else
863 vput(tdvp);
864 if (tvp)
865 vput(tvp);
866 VOP_ABORTOP(fdvp, fcnp);
867 vrele(fdvp);
868 vrele(fvp);
869 return (error);
870 }
871
872 /*
873 * If source and dest are the same, do nothing.
874 */
875 if (tvp == fvp) {
876 error = 0;
877 goto abortit;
878 }
879
880 /*
881 * XXX: This can deadlock since we hold tdvp/tvp locked.
882 * But I'm not going to fix it now.
883 */
884 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0)
885 goto abortit;
886 dp = VTODE(fdvp);
887 ip = VTODE(fvp);
888
889 /*
890 * Be sure we are not renaming ".", "..", or an alias of ".". This
891 * leads to a crippled directory tree. It's pretty tough to do a
892 * "ls" or "pwd" with the "." directory entry missing, and "cd .."
893 * doesn't work if the ".." entry is missing.
894 */
895 if (ip->de_Attributes & ATTR_DIRECTORY) {
896 /*
897 * Avoid ".", "..", and aliases of "." for obvious reasons.
898 */
899 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
900 dp == ip ||
901 (fcnp->cn_flags & ISDOTDOT) ||
902 (tcnp->cn_flags & ISDOTDOT) ||
903 (ip->de_flag & DE_RENAME)) {
904 VOP_UNLOCK(fvp);
905 error = EINVAL;
906 goto abortit;
907 }
908 ip->de_flag |= DE_RENAME;
909 doingdirectory++;
910 }
911 VN_KNOTE(fdvp, NOTE_WRITE); /* XXXLUKEM/XXX: right place? */
912
913 fstrans_start(mp, FSTRANS_SHARED);
914 /*
915 * When the target exists, both the directory
916 * and target vnodes are returned locked.
917 */
918 dp = VTODE(tdvp);
919 xp = tvp ? VTODE(tvp) : NULL;
920 /*
921 * Remember direntry place to use for destination
922 */
923 to_diroffset = dp->de_fndoffset;
924 to_count = dp->de_fndcnt;
925
926 /*
927 * If ".." must be changed (ie the directory gets a new
928 * parent) then the source directory must not be in the
929 * directory hierarchy above the target, as this would
930 * orphan everything below the source directory. Also
931 * the user must have write permission in the source so
932 * as to be able to change "..". We must repeat the call
933 * to namei, as the parent directory is unlocked by the
934 * call to doscheckpath().
935 */
936 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred);
937 VOP_UNLOCK(fvp);
938 if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster)
939 newparent = 1;
940
941 if (doingdirectory && newparent) {
942 if (error) /* write access check above */
943 goto tdvpbad;
944 if (xp != NULL)
945 vput(tvp);
946 tvp = NULL;
947 /*
948 * doscheckpath() vput()'s tdvp (dp == VTODE(tdvp)),
949 * so we have to get an extra ref to it first, and
950 * because it's been unlocked we need to do a relookup
951 * afterwards in case tvp has changed.
952 */
953 vref(tdvp);
954 if ((error = doscheckpath(ip, dp)) != 0)
955 goto bad;
956 vn_lock(tdvp, LK_EXCLUSIVE | LK_RETRY);
957 if ((error = relookup(tdvp, &tvp, tcnp, 0)) != 0) {
958 VOP_UNLOCK(tdvp);
959 goto bad;
960 }
961 dp = VTODE(tdvp);
962 xp = tvp ? VTODE(tvp) : NULL;
963 }
964
965 if (xp != NULL) {
966 /*
967 * Target must be empty if a directory and have no links
968 * to it. Also, ensure source and target are compatible
969 * (both directories, or both not directories).
970 */
971 if (xp->de_Attributes & ATTR_DIRECTORY) {
972 if (!dosdirempty(xp)) {
973 error = ENOTEMPTY;
974 goto tdvpbad;
975 }
976 if (!doingdirectory) {
977 error = ENOTDIR;
978 goto tdvpbad;
979 }
980 } else if (doingdirectory) {
981 error = EISDIR;
982 goto tdvpbad;
983 }
984 if ((error = removede(dp, xp)) != 0)
985 goto tdvpbad;
986 VN_KNOTE(tdvp, NOTE_WRITE);
987 VN_KNOTE(tvp, NOTE_DELETE);
988 cache_purge(tvp);
989 vput(tvp);
990 tvp = NULL;
991 xp = NULL;
992 }
993
994 /*
995 * Convert the filename in tcnp into a dos filename. We copy this
996 * into the denode and directory entry for the destination
997 * file/directory.
998 */
999 if ((error = uniqdosname(VTODE(tdvp), tcnp, toname)) != 0) {
1000 fstrans_done(mp);
1001 goto abortit;
1002 }
1003
1004 /*
1005 * Since from wasn't locked at various places above,
1006 * have to do a relookup here.
1007 */
1008 fcnp->cn_flags &= ~MODMASK;
1009 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
1010 VOP_UNLOCK(tdvp);
1011 vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY);
1012 if ((error = relookup(fdvp, &fvp, fcnp, 0))) {
1013 VOP_UNLOCK(fdvp);
1014 vrele(ap->a_fvp);
1015 vrele(tdvp);
1016 fstrans_done(mp);
1017 return (error);
1018 }
1019 if (fvp == NULL) {
1020 /*
1021 * From name has disappeared.
1022 */
1023 if (doingdirectory)
1024 panic("rename: lost dir entry");
1025 vput(fdvp);
1026 vrele(ap->a_fvp);
1027 vrele(tdvp);
1028 fstrans_done(mp);
1029 return 0;
1030 }
1031 VOP_UNLOCK(fdvp);
1032 xp = VTODE(fvp);
1033 zp = VTODE(fdvp);
1034 from_diroffset = zp->de_fndoffset;
1035
1036 /*
1037 * Ensure that the directory entry still exists and has not
1038 * changed till now. If the source is a file the entry may
1039 * have been unlinked or renamed. In either case there is
1040 * no further work to be done. If the source is a directory
1041 * then it cannot have been rmdir'ed or renamed; this is
1042 * prohibited by the DE_RENAME flag.
1043 */
1044 if (xp != ip) {
1045 if (doingdirectory)
1046 panic("rename: lost dir entry");
1047 vrele(ap->a_fvp);
1048 xp = NULL;
1049 } else {
1050 vrele(fvp);
1051 xp = NULL;
1052
1053 /*
1054 * First write a new entry in the destination
1055 * directory and mark the entry in the source directory
1056 * as deleted. Then move the denode to the correct hash
1057 * chain for its new location in the filesystem. And, if
1058 * we moved a directory, then update its .. entry to point
1059 * to the new parent directory.
1060 */
1061 memcpy(oldname, ip->de_Name, 11);
1062 memcpy(ip->de_Name, toname, 11); /* update denode */
1063 dp->de_fndoffset = to_diroffset;
1064 dp->de_fndcnt = to_count;
1065 error = createde(ip, dp, (struct denode **)0, tcnp);
1066 if (error) {
1067 memcpy(ip->de_Name, oldname, 11);
1068 VOP_UNLOCK(fvp);
1069 goto bad;
1070 }
1071 ip->de_refcnt++;
1072 zp->de_fndoffset = from_diroffset;
1073 if ((error = removede(zp, ip)) != 0) {
1074 /* XXX should really panic here, fs is corrupt */
1075 VOP_UNLOCK(fvp);
1076 goto bad;
1077 }
1078 cache_purge(fvp);
1079 if (!doingdirectory) {
1080 struct denode_key old_key = ip->de_key;
1081 struct denode_key new_key = ip->de_key;
1082
1083 error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0,
1084 &new_key.dk_dirclust, 0);
1085 if (error) {
1086 /* XXX should really panic here, fs is corrupt */
1087 VOP_UNLOCK(fvp);
1088 goto bad;
1089 }
1090 new_key.dk_diroffset = to_diroffset;
1091 if (new_key.dk_dirclust != MSDOSFSROOT)
1092 new_key.dk_diroffset &= pmp->pm_crbomask;
1093 vcache_rekey_enter(pmp->pm_mountp, fvp, &old_key,
1094 sizeof(old_key), &new_key, sizeof(new_key));
1095 ip->de_key = new_key;
1096 vcache_rekey_exit(pmp->pm_mountp, fvp, &old_key,
1097 sizeof(old_key), &ip->de_key, sizeof(ip->de_key));
1098 }
1099 }
1100
1101 /*
1102 * If we moved a directory to a new parent directory, then we must
1103 * fixup the ".." entry in the moved directory.
1104 */
1105 if (doingdirectory && newparent) {
1106 cn = ip->de_StartCluster;
1107 if (cn == MSDOSFSROOT) {
1108 /* this should never happen */
1109 panic("msdosfs_rename: updating .. in root directory?");
1110 } else
1111 bn = cntobn(pmp, cn);
1112 error = bread(pmp->pm_devvp, de_bn2kb(pmp, bn),
1113 pmp->pm_bpcluster, B_MODIFY, &bp);
1114 if (error) {
1115 /* XXX should really panic here, fs is corrupt */
1116 VOP_UNLOCK(fvp);
1117 goto bad;
1118 }
1119 dotdotp = (struct direntry *)bp->b_data + 1;
1120 putushort(dotdotp->deStartCluster, dp->de_StartCluster);
1121 if (FAT32(pmp)) {
1122 putushort(dotdotp->deHighClust,
1123 dp->de_StartCluster >> 16);
1124 } else {
1125 putushort(dotdotp->deHighClust, 0);
1126 }
1127 if ((error = bwrite(bp)) != 0) {
1128 /* XXX should really panic here, fs is corrupt */
1129 VOP_UNLOCK(fvp);
1130 goto bad;
1131 }
1132 }
1133
1134 VN_KNOTE(fvp, NOTE_RENAME);
1135 VOP_UNLOCK(fvp);
1136 bad:
1137 if (tvp)
1138 vput(tvp);
1139 vrele(tdvp);
1140 ip->de_flag &= ~DE_RENAME;
1141 vrele(fdvp);
1142 vrele(fvp);
1143 fstrans_done(mp);
1144 return (error);
1145
1146 /* XXX: uuuh */
1147 tdvpbad:
1148 VOP_UNLOCK(tdvp);
1149 goto bad;
1150 }
1151
1152 static const struct {
1153 struct direntry dot;
1154 struct direntry dotdot;
1155 } dosdirtemplate = {
1156 { ". ", " ", /* the . entry */
1157 ATTR_DIRECTORY, /* file attribute */
1158 0, /* reserved */
1159 0, { 0, 0 }, { 0, 0 }, /* create time & date */
1160 { 0, 0 }, /* access date */
1161 { 0, 0 }, /* high bits of start cluster */
1162 { 210, 4 }, { 210, 4 }, /* modify time & date */
1163 { 0, 0 }, /* startcluster */
1164 { 0, 0, 0, 0 } /* filesize */
1165 },
1166 { ".. ", " ", /* the .. entry */
1167 ATTR_DIRECTORY, /* file attribute */
1168 0, /* reserved */
1169 0, { 0, 0 }, { 0, 0 }, /* create time & date */
1170 { 0, 0 }, /* access date */
1171 { 0, 0 }, /* high bits of start cluster */
1172 { 210, 4 }, { 210, 4 }, /* modify time & date */
1173 { 0, 0 }, /* startcluster */
1174 { 0, 0, 0, 0 } /* filesize */
1175 }
1176 };
1177
1178 int
msdosfs_mkdir(void * v)1179 msdosfs_mkdir(void *v)
1180 {
1181 struct vop_mkdir_v3_args /* {
1182 struct vnode *a_dvp;
1183 struvt vnode **a_vpp;
1184 struvt componentname *a_cnp;
1185 struct vattr *a_vap;
1186 } */ *ap = v;
1187 struct componentname *cnp = ap->a_cnp;
1188 struct denode ndirent;
1189 struct denode *dep;
1190 struct denode *pdep = VTODE(ap->a_dvp);
1191 int error;
1192 int bn;
1193 u_long newcluster, pcl;
1194 daddr_t lbn;
1195 struct direntry *denp;
1196 struct msdosfsmount *pmp = pdep->de_pmp;
1197 struct buf *bp;
1198 int async = pdep->de_pmp->pm_mountp->mnt_flag & MNT_ASYNC;
1199
1200 fstrans_start(ap->a_dvp->v_mount, FSTRANS_SHARED);
1201 /*
1202 * If this is the root directory and there is no space left we
1203 * can't do anything. This is because the root directory can not
1204 * change size.
1205 */
1206 if (pdep->de_StartCluster == MSDOSFSROOT
1207 && pdep->de_fndoffset >= pdep->de_FileSize) {
1208 error = ENOSPC;
1209 goto bad2;
1210 }
1211
1212 /*
1213 * Allocate a cluster to hold the about to be created directory.
1214 */
1215 error = clusteralloc(pmp, 0, 1, &newcluster, NULL);
1216 if (error)
1217 goto bad2;
1218
1219 memset(&ndirent, 0, sizeof(ndirent));
1220 ndirent.de_pmp = pmp;
1221 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE;
1222 DETIMES(&ndirent, NULL, NULL, NULL, pmp->pm_gmtoff);
1223
1224 /*
1225 * Now fill the cluster with the "." and ".." entries. And write
1226 * the cluster to disk. This way it is there for the parent
1227 * directory to be pointing at if there were a crash.
1228 */
1229 bn = cntobn(pmp, newcluster);
1230 lbn = de_bn2kb(pmp, bn);
1231 /* always succeeds */
1232 bp = getblk(pmp->pm_devvp, lbn, pmp->pm_bpcluster, 0, 0);
1233 memset(bp->b_data, 0, pmp->pm_bpcluster);
1234 memcpy(bp->b_data, &dosdirtemplate, sizeof dosdirtemplate);
1235 denp = (struct direntry *)bp->b_data;
1236 putushort(denp[0].deStartCluster, newcluster);
1237 putushort(denp[0].deCDate, ndirent.de_CDate);
1238 putushort(denp[0].deCTime, ndirent.de_CTime);
1239 denp[0].deCHundredth = ndirent.de_CHun;
1240 putushort(denp[0].deADate, ndirent.de_ADate);
1241 putushort(denp[0].deMDate, ndirent.de_MDate);
1242 putushort(denp[0].deMTime, ndirent.de_MTime);
1243 pcl = pdep->de_StartCluster;
1244 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk)
1245 pcl = 0;
1246 putushort(denp[1].deStartCluster, pcl);
1247 putushort(denp[1].deCDate, ndirent.de_CDate);
1248 putushort(denp[1].deCTime, ndirent.de_CTime);
1249 denp[1].deCHundredth = ndirent.de_CHun;
1250 putushort(denp[1].deADate, ndirent.de_ADate);
1251 putushort(denp[1].deMDate, ndirent.de_MDate);
1252 putushort(denp[1].deMTime, ndirent.de_MTime);
1253 if (FAT32(pmp)) {
1254 putushort(denp[0].deHighClust, newcluster >> 16);
1255 putushort(denp[1].deHighClust, pdep->de_StartCluster >> 16);
1256 } else {
1257 putushort(denp[0].deHighClust, 0);
1258 putushort(denp[1].deHighClust, 0);
1259 }
1260
1261 if (async)
1262 bdwrite(bp);
1263 else if ((error = bwrite(bp)) != 0)
1264 goto bad;
1265
1266 /*
1267 * Now build up a directory entry pointing to the newly allocated
1268 * cluster. This will be written to an empty slot in the parent
1269 * directory.
1270 */
1271 if ((error = uniqdosname(pdep, cnp, ndirent.de_Name)) != 0)
1272 goto bad;
1273
1274 ndirent.de_Attributes = ATTR_DIRECTORY;
1275 ndirent.de_StartCluster = newcluster;
1276 ndirent.de_FileSize = 0;
1277 ndirent.de_dev = pdep->de_dev;
1278 ndirent.de_devvp = pdep->de_devvp;
1279 if ((error = createde(&ndirent, pdep, &dep, cnp)) != 0)
1280 goto bad;
1281 VN_KNOTE(ap->a_dvp, NOTE_WRITE | NOTE_LINK);
1282 *ap->a_vpp = DETOV(dep);
1283 fstrans_done(ap->a_dvp->v_mount);
1284 return (0);
1285
1286 bad:
1287 clusterfree(pmp, newcluster, NULL);
1288 bad2:
1289 fstrans_done(ap->a_dvp->v_mount);
1290 return (error);
1291 }
1292
1293 int
msdosfs_rmdir(void * v)1294 msdosfs_rmdir(void *v)
1295 {
1296 struct vop_rmdir_args /* {
1297 struct vnode *a_dvp;
1298 struct vnode *a_vp;
1299 struct componentname *a_cnp;
1300 } */ *ap = v;
1301 struct vnode *vp = ap->a_vp;
1302 struct vnode *dvp = ap->a_dvp;
1303 struct mount *mp = dvp->v_mount;
1304 struct componentname *cnp = ap->a_cnp;
1305 struct denode *ip, *dp;
1306 int error;
1307
1308 ip = VTODE(vp);
1309 dp = VTODE(dvp);
1310 /*
1311 * No rmdir "." please.
1312 */
1313 if (dp == ip) {
1314 vrele(dvp);
1315 vput(vp);
1316 return (EINVAL);
1317 }
1318 fstrans_start(mp, FSTRANS_SHARED);
1319 /*
1320 * Verify the directory is empty (and valid).
1321 * (Rmdir ".." won't be valid since
1322 * ".." will contain a reference to
1323 * the current directory and thus be
1324 * non-empty.)
1325 */
1326 error = 0;
1327 if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) {
1328 error = ENOTEMPTY;
1329 goto out;
1330 }
1331 /*
1332 * Delete the entry from the directory. For dos filesystems this
1333 * gets rid of the directory entry on disk, the in memory copy
1334 * still exists but the de_refcnt is <= 0. This prevents it from
1335 * being found by deget(). When the vput() on dep is done we give
1336 * up access and eventually msdosfs_reclaim() will be called which
1337 * will remove it from the denode cache.
1338 */
1339 if ((error = removede(dp, ip)) != 0)
1340 goto out;
1341 /*
1342 * This is where we decrement the link count in the parent
1343 * directory. Since dos filesystems don't do this we just purge
1344 * the name cache and let go of the parent directory denode.
1345 */
1346 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK);
1347 cache_purge(dvp);
1348 vput(dvp);
1349 dvp = NULL;
1350 /*
1351 * Truncate the directory that is being deleted.
1352 */
1353 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred);
1354 cache_purge(vp);
1355 out:
1356 VN_KNOTE(vp, NOTE_DELETE);
1357 if (dvp)
1358 vput(dvp);
1359 vput(vp);
1360 fstrans_done(mp);
1361 return (error);
1362 }
1363
1364 int
msdosfs_readdir(void * v)1365 msdosfs_readdir(void *v)
1366 {
1367 struct vop_readdir_args /* {
1368 struct vnode *a_vp;
1369 struct uio *a_uio;
1370 kauth_cred_t a_cred;
1371 int *a_eofflag;
1372 off_t **a_cookies;
1373 int *a_ncookies;
1374 } */ *ap = v;
1375 int error = 0;
1376 int diff;
1377 long n;
1378 int blsize;
1379 long on;
1380 long lost;
1381 long count;
1382 u_long cn;
1383 ino_t fileno;
1384 u_long dirsperblk;
1385 long bias = 0;
1386 daddr_t bn, lbn;
1387 struct buf *bp;
1388 struct denode *dep = VTODE(ap->a_vp);
1389 struct msdosfsmount *pmp = dep->de_pmp;
1390 struct direntry *dentp;
1391 struct dirent *dirbuf;
1392 struct uio *uio = ap->a_uio;
1393 off_t *cookies = NULL;
1394 int ncookies = 0, nc = 0;
1395 off_t offset, uio_off;
1396 int chksum = -1;
1397
1398 #ifdef MSDOSFS_DEBUG
1399 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n",
1400 ap->a_vp, uio, ap->a_cred, ap->a_eofflag);
1401 #endif
1402
1403 /*
1404 * msdosfs_readdir() won't operate properly on regular files since
1405 * it does i/o only with the filesystem vnode, and hence can
1406 * retrieve the wrong block from the buffer cache for a plain file.
1407 * So, fail attempts to readdir() on a plain file.
1408 */
1409 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0)
1410 return (ENOTDIR);
1411
1412 /*
1413 * If the user buffer is smaller than the size of one dos directory
1414 * entry or the file offset is not a multiple of the size of a
1415 * directory entry, then we fail the read.
1416 */
1417 count = uio->uio_resid & ~(sizeof(struct direntry) - 1);
1418 offset = uio->uio_offset;
1419 if (count < sizeof(struct direntry) ||
1420 (offset & (sizeof(struct direntry) - 1)))
1421 return (EINVAL);
1422 lost = uio->uio_resid - count;
1423 uio->uio_resid = count;
1424 uio_off = uio->uio_offset;
1425
1426 fstrans_start(ap->a_vp->v_mount, FSTRANS_SHARED);
1427
1428 /* Allocate a temporary dirent buffer. */
1429 dirbuf = malloc(sizeof(struct dirent), M_MSDOSFSTMP, M_WAITOK | M_ZERO);
1430
1431 if (ap->a_ncookies) {
1432 nc = uio->uio_resid / _DIRENT_MINSIZE((struct dirent *)0);
1433 cookies = malloc(nc * sizeof (off_t), M_TEMP, M_WAITOK);
1434 *ap->a_cookies = cookies;
1435 }
1436
1437 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry);
1438
1439 /*
1440 * If they are reading from the root directory then, we simulate
1441 * the . and .. entries since these don't exist in the root
1442 * directory. We also set the offset bias to make up for having to
1443 * simulate these entries. By this I mean that at file offset 64 we
1444 * read the first entry in the root directory that lives on disk.
1445 */
1446 if (dep->de_StartCluster == MSDOSFSROOT
1447 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) {
1448 #if 0
1449 printf("msdosfs_readdir(): going after . or .. in root dir, "
1450 "offset %" PRIu64 "\n", offset);
1451 #endif
1452 bias = 2 * sizeof(struct direntry);
1453 if (offset < bias) {
1454 for (n = (int)offset / sizeof(struct direntry);
1455 n < 2; n++) {
1456 if (FAT32(pmp))
1457 dirbuf->d_fileno = cntobn(pmp,
1458 (ino_t)pmp->pm_rootdirblk)
1459 * dirsperblk;
1460 else
1461 dirbuf->d_fileno = 1;
1462 dirbuf->d_type = DT_DIR;
1463 switch (n) {
1464 case 0:
1465 dirbuf->d_namlen = 1;
1466 strlcpy(dirbuf->d_name, ".",
1467 sizeof(dirbuf->d_name));
1468 break;
1469 case 1:
1470 dirbuf->d_namlen = 2;
1471 strlcpy(dirbuf->d_name, "..",
1472 sizeof(dirbuf->d_name));
1473 break;
1474 }
1475 dirbuf->d_reclen = _DIRENT_SIZE(dirbuf);
1476 if (uio->uio_resid < dirbuf->d_reclen)
1477 goto out;
1478 error = uiomove(dirbuf, dirbuf->d_reclen, uio);
1479 if (error)
1480 goto out;
1481 offset += sizeof(struct direntry);
1482 uio_off = offset;
1483 if (cookies) {
1484 *cookies++ = offset;
1485 ncookies++;
1486 if (ncookies >= nc)
1487 goto out;
1488 }
1489 }
1490 }
1491 }
1492
1493 while (uio->uio_resid > 0) {
1494 lbn = de_cluster(pmp, offset - bias);
1495 on = (offset - bias) & pmp->pm_crbomask;
1496 n = MIN(pmp->pm_bpcluster - on, uio->uio_resid);
1497 diff = dep->de_FileSize - (offset - bias);
1498 if (diff <= 0)
1499 break;
1500 n = MIN(n, diff);
1501 if ((error = pcbmap(dep, lbn, &bn, &cn, &blsize)) != 0)
1502 break;
1503 error = bread(pmp->pm_devvp, de_bn2kb(pmp, bn), blsize,
1504 0, &bp);
1505 if (error) {
1506 goto bad;
1507 }
1508 n = MIN(n, blsize - bp->b_resid);
1509
1510 /*
1511 * Convert from dos directory entries to fs-independent
1512 * directory entries.
1513 */
1514 for (dentp = (struct direntry *)((char *)bp->b_data + on);
1515 (char *)dentp < (char *)bp->b_data + on + n;
1516 dentp++, offset += sizeof(struct direntry)) {
1517 #if 0
1518
1519 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n",
1520 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes);
1521 #endif
1522 /*
1523 * If this is an unused entry, we can stop.
1524 */
1525 if (dentp->deName[0] == SLOT_EMPTY) {
1526 brelse(bp, 0);
1527 goto out;
1528 }
1529 /*
1530 * Skip deleted entries.
1531 */
1532 if (dentp->deName[0] == SLOT_DELETED) {
1533 chksum = -1;
1534 continue;
1535 }
1536
1537 /*
1538 * Handle Win95 long directory entries
1539 */
1540 if (dentp->deAttributes == ATTR_WIN95) {
1541 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME)
1542 continue;
1543 chksum = win2unixfn((struct winentry *)dentp,
1544 dirbuf, chksum);
1545 continue;
1546 }
1547
1548 /*
1549 * Skip volume labels
1550 */
1551 if (dentp->deAttributes & ATTR_VOLUME) {
1552 chksum = -1;
1553 continue;
1554 }
1555 /*
1556 * This computation of d_fileno must match
1557 * the computation of va_fileid in
1558 * msdosfs_getattr.
1559 */
1560 if (dentp->deAttributes & ATTR_DIRECTORY) {
1561 fileno = getushort(dentp->deStartCluster);
1562 if (FAT32(pmp))
1563 fileno |= ((ino_t)getushort(dentp->deHighClust)) << 16;
1564 /* if this is the root directory */
1565 if (fileno == MSDOSFSROOT)
1566 if (FAT32(pmp))
1567 fileno = cntobn(pmp,
1568 (ino_t)pmp->pm_rootdirblk)
1569 * dirsperblk;
1570 else
1571 fileno = 1;
1572 else
1573 fileno = cntobn(pmp, fileno) * dirsperblk;
1574 dirbuf->d_fileno = fileno;
1575 dirbuf->d_type = DT_DIR;
1576 } else {
1577 dirbuf->d_fileno =
1578 offset / sizeof(struct direntry);
1579 dirbuf->d_type = DT_REG;
1580 }
1581 if (chksum != winChksum(dentp->deName))
1582 dirbuf->d_namlen = dos2unixfn(dentp->deName,
1583 (u_char *)dirbuf->d_name,
1584 pmp->pm_flags & MSDOSFSMNT_SHORTNAME);
1585 else
1586 dirbuf->d_name[dirbuf->d_namlen] = 0;
1587 chksum = -1;
1588 dirbuf->d_reclen = _DIRENT_SIZE(dirbuf);
1589 if (uio->uio_resid < dirbuf->d_reclen) {
1590 brelse(bp, 0);
1591 goto out;
1592 }
1593 error = uiomove(dirbuf, dirbuf->d_reclen, uio);
1594 if (error) {
1595 brelse(bp, 0);
1596 goto out;
1597 }
1598 uio_off = offset + sizeof(struct direntry);
1599 if (cookies) {
1600 *cookies++ = offset + sizeof(struct direntry);
1601 ncookies++;
1602 if (ncookies >= nc) {
1603 brelse(bp, 0);
1604 goto out;
1605 }
1606 }
1607 }
1608 brelse(bp, 0);
1609 }
1610
1611 out:
1612 uio->uio_offset = uio_off;
1613 uio->uio_resid += lost;
1614 if (dep->de_FileSize - (offset - bias) <= 0)
1615 *ap->a_eofflag = 1;
1616 else
1617 *ap->a_eofflag = 0;
1618
1619 if (ap->a_ncookies) {
1620 if (error) {
1621 free(*ap->a_cookies, M_TEMP);
1622 *ap->a_ncookies = 0;
1623 *ap->a_cookies = NULL;
1624 } else
1625 *ap->a_ncookies = ncookies;
1626 }
1627
1628 bad:
1629 free(dirbuf, M_MSDOSFSTMP);
1630 fstrans_done(ap->a_vp->v_mount);
1631 return (error);
1632 }
1633
1634 /*
1635 * vp - address of vnode file the file
1636 * bn - which cluster we are interested in mapping to a filesystem block number.
1637 * vpp - returns the vnode for the block special file holding the filesystem
1638 * containing the file of interest
1639 * bnp - address of where to return the filesystem relative block number
1640 */
1641 int
msdosfs_bmap(void * v)1642 msdosfs_bmap(void *v)
1643 {
1644 struct vop_bmap_args /* {
1645 struct vnode *a_vp;
1646 daddr_t a_bn;
1647 struct vnode **a_vpp;
1648 daddr_t *a_bnp;
1649 int *a_runp;
1650 } */ *ap = v;
1651 struct denode *dep = VTODE(ap->a_vp);
1652 int run, maxrun;
1653 daddr_t runbn;
1654 int status;
1655
1656 if (ap->a_vpp != NULL)
1657 *ap->a_vpp = dep->de_devvp;
1658 if (ap->a_bnp == NULL)
1659 return (0);
1660 status = pcbmap(dep, ap->a_bn, ap->a_bnp, 0, 0);
1661
1662 /*
1663 * From FreeBSD:
1664 * A little kludgy, but we loop calling pcbmap until we
1665 * reach the end of the contiguous piece, or reach MAXPHYS.
1666 * Since it reduces disk I/Os, the "wasted" CPU is put to
1667 * good use (4 to 5 fold sequential read I/O improvement on USB
1668 * drives).
1669 */
1670 if (ap->a_runp != NULL) {
1671 /* taken from ufs_bmap */
1672 maxrun = ulmin(MAXPHYS / dep->de_pmp->pm_bpcluster - 1,
1673 dep->de_pmp->pm_maxcluster - ap->a_bn);
1674 for (run = 1; run <= maxrun; run++) {
1675 if (pcbmap(dep, ap->a_bn + run, &runbn, NULL, NULL)
1676 != 0 || runbn !=
1677 *ap->a_bnp + de_cn2bn(dep->de_pmp, run))
1678 break;
1679 }
1680 *ap->a_runp = run - 1;
1681 }
1682
1683 /*
1684 * We need to scale *ap->a_bnp by sector_size/DEV_BSIZE
1685 */
1686 *ap->a_bnp = de_bn2kb(dep->de_pmp, *ap->a_bnp);
1687 return status;
1688 }
1689
1690 int
msdosfs_strategy(void * v)1691 msdosfs_strategy(void *v)
1692 {
1693 struct vop_strategy_args /* {
1694 struct vnode *a_vp;
1695 struct buf *a_bp;
1696 } */ *ap = v;
1697 struct vnode *vp = ap->a_vp;
1698 struct buf *bp = ap->a_bp;
1699 struct denode *dep = VTODE(bp->b_vp);
1700 int error = 0;
1701
1702 if (vp->v_type == VBLK || vp->v_type == VCHR)
1703 panic("msdosfs_strategy: spec");
1704 /*
1705 * If we don't already know the filesystem relative block number
1706 * then get it using pcbmap(). If pcbmap() returns the block
1707 * number as -1 then we've got a hole in the file. DOS filesystems
1708 * don't allow files with holes, so we shouldn't ever see this.
1709 */
1710 if (bp->b_blkno == bp->b_lblkno) {
1711 error = pcbmap(dep, de_bn2cn(dep->de_pmp, bp->b_lblkno),
1712 &bp->b_blkno, 0, 0);
1713 if (error)
1714 bp->b_blkno = -1;
1715 if (bp->b_blkno == -1)
1716 clrbuf(bp);
1717 else
1718 bp->b_blkno = de_bn2kb(dep->de_pmp, bp->b_blkno);
1719 }
1720 if (bp->b_blkno == -1) {
1721 biodone(bp);
1722 return (error);
1723 }
1724
1725 /*
1726 * Read/write the block from/to the disk that contains the desired
1727 * file block.
1728 */
1729
1730 vp = dep->de_devvp;
1731 return (VOP_STRATEGY(vp, bp));
1732 }
1733
1734 int
msdosfs_print(void * v)1735 msdosfs_print(void *v)
1736 {
1737 struct vop_print_args /* {
1738 struct vnode *vp;
1739 } */ *ap = v;
1740 struct denode *dep = VTODE(ap->a_vp);
1741
1742 printf(
1743 "tag VT_MSDOSFS, startcluster %ld, dircluster %ld, diroffset %ld ",
1744 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset);
1745 printf(" dev %llu, %llu ", (unsigned long long)major(dep->de_dev),
1746 (unsigned long long)minor(dep->de_dev));
1747 printf("\n");
1748 return (0);
1749 }
1750
1751 int
msdosfs_advlock(void * v)1752 msdosfs_advlock(void *v)
1753 {
1754 struct vop_advlock_args /* {
1755 struct vnode *a_vp;
1756 void *a_id;
1757 int a_op;
1758 struct flock *a_fl;
1759 int a_flags;
1760 } */ *ap = v;
1761 struct denode *dep = VTODE(ap->a_vp);
1762
1763 return lf_advlock(ap, &dep->de_lockf, dep->de_FileSize);
1764 }
1765
1766 int
msdosfs_pathconf(void * v)1767 msdosfs_pathconf(void *v)
1768 {
1769 struct vop_pathconf_args /* {
1770 struct vnode *a_vp;
1771 int a_name;
1772 register_t *a_retval;
1773 } */ *ap = v;
1774
1775 switch (ap->a_name) {
1776 case _PC_LINK_MAX:
1777 *ap->a_retval = 1;
1778 return (0);
1779 case _PC_NAME_MAX:
1780 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_namemax;
1781 return (0);
1782 case _PC_PATH_MAX:
1783 *ap->a_retval = PATH_MAX;
1784 return (0);
1785 case _PC_CHOWN_RESTRICTED:
1786 *ap->a_retval = 1;
1787 return (0);
1788 case _PC_NO_TRUNC:
1789 *ap->a_retval = 1;
1790 return (0);
1791 case _PC_SYNC_IO:
1792 *ap->a_retval = 1;
1793 return (0);
1794 case _PC_FILESIZEBITS:
1795 *ap->a_retval = 32;
1796 return (0);
1797 default:
1798 return (EINVAL);
1799 }
1800 /* NOTREACHED */
1801 }
1802
1803 int
msdosfs_fsync(void * v)1804 msdosfs_fsync(void *v)
1805 {
1806 struct vop_fsync_args /* {
1807 struct vnode *a_vp;
1808 kauth_cred_t a_cred;
1809 int a_flags;
1810 off_t offlo;
1811 off_t offhi;
1812 } */ *ap = v;
1813 struct vnode *vp = ap->a_vp;
1814 int wait;
1815 int error;
1816
1817 fstrans_start(vp->v_mount, FSTRANS_LAZY);
1818 wait = (ap->a_flags & FSYNC_WAIT) != 0;
1819 error = vflushbuf(vp, ap->a_flags);
1820 if (error == 0 && (ap->a_flags & FSYNC_DATAONLY) == 0)
1821 error = msdosfs_update(vp, NULL, NULL, wait ? UPDATE_WAIT : 0);
1822
1823 if (error == 0 && ap->a_flags & FSYNC_CACHE) {
1824 struct denode *dep = VTODE(vp);
1825 struct vnode *devvp = dep->de_devvp;
1826
1827 int l = 0;
1828 error = VOP_IOCTL(devvp, DIOCCACHESYNC, &l, FWRITE,
1829 curlwp->l_cred);
1830 }
1831 fstrans_done(vp->v_mount);
1832
1833 return (error);
1834 }
1835
1836 void
msdosfs_detimes(struct denode * dep,const struct timespec * acc,const struct timespec * mod,const struct timespec * cre,int gmtoff)1837 msdosfs_detimes(struct denode *dep, const struct timespec *acc,
1838 const struct timespec *mod, const struct timespec *cre, int gmtoff)
1839 {
1840 struct timespec *ts = NULL, tsb;
1841
1842 KASSERT(dep->de_flag & (DE_UPDATE | DE_CREATE | DE_ACCESS));
1843 /* XXX just call getnanotime early and use result if needed? */
1844 dep->de_flag |= DE_MODIFIED;
1845 if (dep->de_flag & DE_UPDATE) {
1846 if (mod == NULL) {
1847 getnanotime(&tsb);
1848 mod = ts = &tsb;
1849 }
1850 unix2dostime(mod, gmtoff, &dep->de_MDate, &dep->de_MTime, NULL);
1851 dep->de_Attributes |= ATTR_ARCHIVE;
1852 }
1853 if ((dep->de_pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0) {
1854 if (dep->de_flag & DE_ACCESS) {
1855 if (acc == NULL)
1856 acc = ts == NULL ?
1857 (getnanotime(&tsb), ts = &tsb) : ts;
1858 unix2dostime(acc, gmtoff, &dep->de_ADate, NULL, NULL);
1859 }
1860 if (dep->de_flag & DE_CREATE) {
1861 if (cre == NULL)
1862 cre = ts == NULL ?
1863 (getnanotime(&tsb), ts = &tsb) : ts;
1864 unix2dostime(cre, gmtoff, &dep->de_CDate,
1865 &dep->de_CTime, &dep->de_CHun);
1866 }
1867 }
1868
1869 dep->de_flag &= ~(DE_UPDATE | DE_CREATE | DE_ACCESS);
1870 }
1871
1872 /* Global vfs data structures for msdosfs */
1873 int (**msdosfs_vnodeop_p)(void *);
1874 const struct vnodeopv_entry_desc msdosfs_vnodeop_entries[] = {
1875 { &vop_default_desc, vn_default_error },
1876 { &vop_lookup_desc, msdosfs_lookup }, /* lookup */
1877 { &vop_create_desc, msdosfs_create }, /* create */
1878 { &vop_mknod_desc, genfs_eopnotsupp }, /* mknod */
1879 { &vop_open_desc, genfs_nullop }, /* open */
1880 { &vop_close_desc, msdosfs_close }, /* close */
1881 { &vop_access_desc, msdosfs_access }, /* access */
1882 { &vop_getattr_desc, msdosfs_getattr }, /* getattr */
1883 { &vop_setattr_desc, msdosfs_setattr }, /* setattr */
1884 { &vop_read_desc, msdosfs_read }, /* read */
1885 { &vop_write_desc, msdosfs_write }, /* write */
1886 { &vop_fallocate_desc, genfs_eopnotsupp }, /* fallocate */
1887 { &vop_fdiscard_desc, genfs_eopnotsupp }, /* fdiscard */
1888 { &vop_fcntl_desc, genfs_fcntl }, /* fcntl */
1889 { &vop_ioctl_desc, msdosfs_ioctl }, /* ioctl */
1890 { &vop_poll_desc, msdosfs_poll }, /* poll */
1891 { &vop_kqfilter_desc, genfs_kqfilter }, /* kqfilter */
1892 { &vop_revoke_desc, msdosfs_revoke }, /* revoke */
1893 { &vop_mmap_desc, msdosfs_mmap }, /* mmap */
1894 { &vop_fsync_desc, msdosfs_fsync }, /* fsync */
1895 { &vop_seek_desc, msdosfs_seek }, /* seek */
1896 { &vop_remove_desc, msdosfs_remove }, /* remove */
1897 { &vop_link_desc, genfs_eopnotsupp }, /* link */
1898 { &vop_rename_desc, msdosfs_rename }, /* rename */
1899 { &vop_mkdir_desc, msdosfs_mkdir }, /* mkdir */
1900 { &vop_rmdir_desc, msdosfs_rmdir }, /* rmdir */
1901 { &vop_symlink_desc, genfs_eopnotsupp }, /* symlink */
1902 { &vop_readdir_desc, msdosfs_readdir }, /* readdir */
1903 { &vop_readlink_desc, genfs_einval }, /* readlink */
1904 { &vop_abortop_desc, msdosfs_abortop }, /* abortop */
1905 { &vop_inactive_desc, msdosfs_inactive }, /* inactive */
1906 { &vop_reclaim_desc, msdosfs_reclaim }, /* reclaim */
1907 { &vop_lock_desc, genfs_lock }, /* lock */
1908 { &vop_unlock_desc, genfs_unlock }, /* unlock */
1909 { &vop_bmap_desc, msdosfs_bmap }, /* bmap */
1910 { &vop_strategy_desc, msdosfs_strategy }, /* strategy */
1911 { &vop_print_desc, msdosfs_print }, /* print */
1912 { &vop_islocked_desc, genfs_islocked }, /* islocked */
1913 { &vop_pathconf_desc, msdosfs_pathconf }, /* pathconf */
1914 { &vop_advlock_desc, msdosfs_advlock }, /* advlock */
1915 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */
1916 { &vop_getpages_desc, genfs_getpages }, /* getpages */
1917 { &vop_putpages_desc, genfs_putpages }, /* putpages */
1918 { NULL, NULL }
1919 };
1920 const struct vnodeopv_desc msdosfs_vnodeop_opv_desc =
1921 { &msdosfs_vnodeop_p, msdosfs_vnodeop_entries };
1922