1 /* $FreeBSD$ */
2 /* $NetBSD: msdosfs_vnops.c,v 1.68 1998/02/10 14:10:04 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/bio.h>
54 #include <sys/buf.h>
55 #include <sys/clock.h>
56 #include <sys/dirent.h>
57 #include <sys/lock.h>
58 #include <sys/lockf.h>
59 #include <sys/malloc.h>
60 #include <sys/mount.h>
61 #include <sys/mutex.h>
62 #include <sys/namei.h>
63 #include <sys/priv.h>
64 #include <sys/proc.h>
65 #include <sys/resourcevar.h>
66 #include <sys/signalvar.h>
67 #include <sys/stat.h>
68 #include <sys/unistd.h>
69 #include <sys/vnode.h>
70
71 #include <vm/vm.h>
72 #include <vm/vm_extern.h>
73
74 #include <fs/msdosfs/bpb.h>
75 #include <fs/msdosfs/direntry.h>
76 #include <fs/msdosfs/denode.h>
77 #include <fs/msdosfs/fat.h>
78 #include <fs/msdosfs/msdosfsmount.h>
79
80 #define DOS_FILESIZE_MAX 0xffffffff
81
82 /*
83 * Prototypes for MSDOSFS vnode operations
84 */
85 static vop_create_t msdosfs_create;
86 static vop_mknod_t msdosfs_mknod;
87 static vop_open_t msdosfs_open;
88 static vop_close_t msdosfs_close;
89 static vop_access_t msdosfs_access;
90 static vop_getattr_t msdosfs_getattr;
91 static vop_setattr_t msdosfs_setattr;
92 static vop_read_t msdosfs_read;
93 static vop_write_t msdosfs_write;
94 static vop_fsync_t msdosfs_fsync;
95 static vop_remove_t msdosfs_remove;
96 static vop_link_t msdosfs_link;
97 static vop_rename_t msdosfs_rename;
98 static vop_mkdir_t msdosfs_mkdir;
99 static vop_rmdir_t msdosfs_rmdir;
100 static vop_symlink_t msdosfs_symlink;
101 static vop_readdir_t msdosfs_readdir;
102 static vop_bmap_t msdosfs_bmap;
103 static vop_strategy_t msdosfs_strategy;
104 static vop_print_t msdosfs_print;
105 static vop_pathconf_t msdosfs_pathconf;
106 static vop_vptofh_t msdosfs_vptofh;
107
108 /*
109 * Some general notes:
110 *
111 * In the ufs filesystem the inodes, superblocks, and indirect blocks are
112 * read/written using the vnode for the filesystem. Blocks that represent
113 * the contents of a file are read/written using the vnode for the file
114 * (including directories when they are read/written as files). This
115 * presents problems for the dos filesystem because data that should be in
116 * an inode (if dos had them) resides in the directory itself. Since we
117 * must update directory entries without the benefit of having the vnode
118 * for the directory we must use the vnode for the filesystem. This means
119 * that when a directory is actually read/written (via read, write, or
120 * readdir, or seek) we must use the vnode for the filesystem instead of
121 * the vnode for the directory as would happen in ufs. This is to insure we
122 * retreive the correct block from the buffer cache since the hash value is
123 * based upon the vnode address and the desired block number.
124 */
125
126 /*
127 * Create a regular file. On entry the directory to contain the file being
128 * created is locked. We must release before we return. We must also free
129 * the pathname buffer pointed at by cnp->cn_pnbuf, always on error, or
130 * only if the SAVESTART bit in cn_flags is clear on success.
131 */
132 static int
133 msdosfs_create(ap)
134 struct vop_create_args /* {
135 struct vnode *a_dvp;
136 struct vnode **a_vpp;
137 struct componentname *a_cnp;
138 struct vattr *a_vap;
139 } */ *ap;
140 {
141 struct componentname *cnp = ap->a_cnp;
142 struct denode ndirent;
143 struct denode *dep;
144 struct denode *pdep = VTODE(ap->a_dvp);
145 struct timespec ts;
146 int error;
147
148 #ifdef MSDOSFS_DEBUG
149 printf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap);
150 #endif
151
152 /*
153 * If this is the root directory and there is no space left we
154 * can't do anything. This is because the root directory can not
155 * change size.
156 */
157 if (pdep->de_StartCluster == MSDOSFSROOT
158 && pdep->de_fndoffset >= pdep->de_FileSize) {
159 error = ENOSPC;
160 goto bad;
161 }
162
163 /*
164 * Create a directory entry for the file, then call createde() to
165 * have it installed. NOTE: DOS files are always executable. We
166 * use the absence of the owner write bit to make the file
167 * readonly.
168 */
169 #ifdef DIAGNOSTIC
170 if ((cnp->cn_flags & HASBUF) == 0)
171 panic("msdosfs_create: no name");
172 #endif
173 bzero(&ndirent, sizeof(ndirent));
174 error = uniqdosname(pdep, cnp, ndirent.de_Name);
175 if (error)
176 goto bad;
177
178 ndirent.de_Attributes = (ap->a_vap->va_mode & VWRITE) ?
179 ATTR_ARCHIVE : ATTR_ARCHIVE | ATTR_READONLY;
180 ndirent.de_LowerCase = 0;
181 ndirent.de_StartCluster = 0;
182 ndirent.de_FileSize = 0;
183 ndirent.de_dev = pdep->de_dev;
184 ndirent.de_pmp = pdep->de_pmp;
185 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE;
186 getnanotime(&ts);
187 DETIMES(&ndirent, &ts, &ts, &ts);
188 error = createde(&ndirent, pdep, &dep, cnp);
189 if (error)
190 goto bad;
191 *ap->a_vpp = DETOV(dep);
192 return (0);
193
194 bad:
195 return (error);
196 }
197
198 static int
199 msdosfs_mknod(ap)
200 struct vop_mknod_args /* {
201 struct vnode *a_dvp;
202 struct vnode **a_vpp;
203 struct componentname *a_cnp;
204 struct vattr *a_vap;
205 } */ *ap;
206 {
207
208 return (EINVAL);
209 }
210
211 static int
212 msdosfs_open(ap)
213 struct vop_open_args /* {
214 struct vnode *a_vp;
215 int a_mode;
216 struct ucred *a_cred;
217 struct thread *a_td;
218 struct file *a_fp;
219 } */ *ap;
220 {
221 struct denode *dep = VTODE(ap->a_vp);
222 vnode_create_vobject(ap->a_vp, dep->de_FileSize, ap->a_td);
223 return 0;
224 }
225
226 static int
227 msdosfs_close(ap)
228 struct vop_close_args /* {
229 struct vnode *a_vp;
230 int a_fflag;
231 struct ucred *a_cred;
232 struct thread *a_td;
233 } */ *ap;
234 {
235 struct vnode *vp = ap->a_vp;
236 struct denode *dep = VTODE(vp);
237 struct timespec ts;
238
239 VI_LOCK(vp);
240 if (vp->v_usecount > 1) {
241 getnanotime(&ts);
242 DETIMES(dep, &ts, &ts, &ts);
243 }
244 VI_UNLOCK(vp);
245 return 0;
246 }
247
248 static int
249 msdosfs_access(ap)
250 struct vop_access_args /* {
251 struct vnode *a_vp;
252 int a_mode;
253 struct ucred *a_cred;
254 struct thread *a_td;
255 } */ *ap;
256 {
257 struct vnode *vp = ap->a_vp;
258 struct denode *dep = VTODE(ap->a_vp);
259 struct msdosfsmount *pmp = dep->de_pmp;
260 mode_t file_mode, mode = ap->a_mode;
261
262 file_mode = (S_IXUSR|S_IXGRP|S_IXOTH) | (S_IRUSR|S_IRGRP|S_IROTH) |
263 ((dep->de_Attributes & ATTR_READONLY) ? 0 : (S_IWUSR|S_IWGRP|S_IWOTH));
264 file_mode &= (vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask);
265
266 /*
267 * Disallow writing to directories and regular files if the
268 * filesystem is read-only.
269 */
270 if (mode & VWRITE) {
271 switch (vp->v_type) {
272 case VDIR:
273 case VREG:
274 if (vp->v_mount->mnt_flag & MNT_RDONLY)
275 return (EROFS);
276 break;
277 default:
278 break;
279 }
280 }
281
282 return (vaccess(vp->v_type, file_mode, pmp->pm_uid, pmp->pm_gid,
283 ap->a_mode, ap->a_cred, NULL));
284 }
285
286 static int
287 msdosfs_getattr(ap)
288 struct vop_getattr_args /* {
289 struct vnode *a_vp;
290 struct vattr *a_vap;
291 struct ucred *a_cred;
292 struct thread *a_td;
293 } */ *ap;
294 {
295 struct denode *dep = VTODE(ap->a_vp);
296 struct msdosfsmount *pmp = dep->de_pmp;
297 struct vattr *vap = ap->a_vap;
298 mode_t mode;
299 struct timespec ts;
300 u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry);
301 uint64_t fileid;
302
303 getnanotime(&ts);
304 DETIMES(dep, &ts, &ts, &ts);
305 vap->va_fsid = dev2udev(dep->de_dev);
306 /*
307 * The following computation of the fileid must be the same as that
308 * used in msdosfs_readdir() to compute d_fileno. If not, pwd
309 * doesn't work.
310 */
311 if (dep->de_Attributes & ATTR_DIRECTORY) {
312 fileid = (uint64_t)cntobn(pmp, dep->de_StartCluster) *
313 dirsperblk;
314 if (dep->de_StartCluster == MSDOSFSROOT)
315 fileid = 1;
316 } else {
317 fileid = (uint64_t)cntobn(pmp, dep->de_dirclust) *
318 dirsperblk;
319 if (dep->de_dirclust == MSDOSFSROOT)
320 fileid = (uint64_t)roottobn(pmp, 0) * dirsperblk;
321 fileid += (uoff_t)dep->de_diroffset / sizeof(struct direntry);
322 }
323
324 if (pmp->pm_flags & MSDOSFS_LARGEFS)
325 vap->va_fileid = msdosfs_fileno_map(pmp->pm_mountp, fileid);
326 else
327 vap->va_fileid = (long)fileid;
328
329 if ((dep->de_Attributes & ATTR_READONLY) == 0)
330 mode = S_IRWXU|S_IRWXG|S_IRWXO;
331 else
332 mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
333 vap->va_mode = mode &
334 (ap->a_vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask);
335 vap->va_uid = pmp->pm_uid;
336 vap->va_gid = pmp->pm_gid;
337 vap->va_nlink = 1;
338 vap->va_rdev = NODEV;
339 vap->va_size = dep->de_FileSize;
340 fattime2timespec(dep->de_MDate, dep->de_MTime, 0, 0, &vap->va_mtime);
341 vap->va_ctime = vap->va_mtime;
342 if (pmp->pm_flags & MSDOSFSMNT_LONGNAME) {
343 fattime2timespec(dep->de_ADate, 0, 0, 0, &vap->va_atime);
344 fattime2timespec(dep->de_CDate, dep->de_CTime, dep->de_CHun,
345 0, &vap->va_birthtime);
346 } else {
347 vap->va_atime = vap->va_mtime;
348 vap->va_birthtime.tv_sec = -1;
349 vap->va_birthtime.tv_nsec = 0;
350 }
351 vap->va_flags = 0;
352 if ((dep->de_Attributes & ATTR_ARCHIVE) == 0)
353 vap->va_flags |= SF_ARCHIVED;
354 vap->va_gen = 0;
355 vap->va_blocksize = pmp->pm_bpcluster;
356 vap->va_bytes =
357 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask;
358 vap->va_type = ap->a_vp->v_type;
359 vap->va_filerev = dep->de_modrev;
360 return (0);
361 }
362
363 static int
364 msdosfs_setattr(ap)
365 struct vop_setattr_args /* {
366 struct vnode *a_vp;
367 struct vattr *a_vap;
368 struct ucred *a_cred;
369 struct thread *a_td;
370 } */ *ap;
371 {
372 struct vnode *vp = ap->a_vp;
373 struct denode *dep = VTODE(ap->a_vp);
374 struct msdosfsmount *pmp = dep->de_pmp;
375 struct vattr *vap = ap->a_vap;
376 struct ucred *cred = ap->a_cred;
377 int error = 0;
378
379 #ifdef MSDOSFS_DEBUG
380 printf("msdosfs_setattr(): vp %p, vap %p, cred %p, p %p\n",
381 ap->a_vp, vap, cred, ap->a_td);
382 #endif
383
384 /*
385 * Check for unsettable attributes.
386 */
387 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
388 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
389 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
390 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
391 #ifdef MSDOSFS_DEBUG
392 printf("msdosfs_setattr(): returning EINVAL\n");
393 printf(" va_type %d, va_nlink %x, va_fsid %lx, va_fileid %lx\n",
394 vap->va_type, vap->va_nlink, vap->va_fsid, vap->va_fileid);
395 printf(" va_blocksize %lx, va_rdev %x, va_bytes %qx, va_gen %lx\n",
396 vap->va_blocksize, vap->va_rdev, vap->va_bytes, vap->va_gen);
397 printf(" va_uid %x, va_gid %x\n",
398 vap->va_uid, vap->va_gid);
399 #endif
400 return (EINVAL);
401 }
402 if (vap->va_flags != VNOVAL) {
403 if (vp->v_mount->mnt_flag & MNT_RDONLY)
404 return (EROFS);
405 if (cred->cr_uid != pmp->pm_uid) {
406 error = priv_check_cred(cred, PRIV_VFS_ADMIN, 0);
407 if (error)
408 return (error);
409 }
410 /*
411 * We are very inconsistent about handling unsupported
412 * attributes. We ignored the access time and the
413 * read and execute bits. We were strict for the other
414 * attributes.
415 *
416 * Here we are strict, stricter than ufs in not allowing
417 * users to attempt to set SF_SETTABLE bits or anyone to
418 * set unsupported bits. However, we ignore attempts to
419 * set ATTR_ARCHIVE for directories `cp -pr' from a more
420 * sensible filesystem attempts it a lot.
421 */
422 if (vap->va_flags & SF_SETTABLE) {
423 error = priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0);
424 if (error)
425 return (error);
426 }
427 if (vap->va_flags & ~SF_ARCHIVED)
428 return EOPNOTSUPP;
429 if (vap->va_flags & SF_ARCHIVED)
430 dep->de_Attributes &= ~ATTR_ARCHIVE;
431 else if (!(dep->de_Attributes & ATTR_DIRECTORY))
432 dep->de_Attributes |= ATTR_ARCHIVE;
433 dep->de_flag |= DE_MODIFIED;
434 }
435
436 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
437 uid_t uid;
438 gid_t gid;
439
440 if (vp->v_mount->mnt_flag & MNT_RDONLY)
441 return (EROFS);
442 uid = vap->va_uid;
443 if (uid == (uid_t)VNOVAL)
444 uid = pmp->pm_uid;
445 gid = vap->va_gid;
446 if (gid == (gid_t)VNOVAL)
447 gid = pmp->pm_gid;
448 if (cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid ||
449 (gid != pmp->pm_gid && !groupmember(gid, cred))) {
450 error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0);
451 if (error)
452 return (error);
453 }
454 if (uid != pmp->pm_uid || gid != pmp->pm_gid)
455 return EINVAL;
456 }
457
458 if (vap->va_size != VNOVAL) {
459 switch (vp->v_type) {
460 case VDIR:
461 return (EISDIR);
462 case VREG:
463 /*
464 * Truncation is only supported for regular files,
465 * Disallow it if the filesystem is read-only.
466 */
467 if (vp->v_mount->mnt_flag & MNT_RDONLY)
468 return (EROFS);
469 break;
470 default:
471 /*
472 * According to POSIX, the result is unspecified
473 * for file types other than regular files,
474 * directories and shared memory objects. We
475 * don't support any file types except regular
476 * files and directories in this file system, so
477 * this (default) case is unreachable and can do
478 * anything. Keep falling through to detrunc()
479 * for now.
480 */
481 break;
482 }
483 error = detrunc(dep, vap->va_size, 0, cred, ap->a_td);
484 if (error)
485 return error;
486 }
487 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
488 if (vp->v_mount->mnt_flag & MNT_RDONLY)
489 return (EROFS);
490 if (vap->va_vaflags & VA_UTIMES_NULL) {
491 error = VOP_ACCESS(vp, VADMIN, cred, ap->a_td);
492 if (error)
493 error = VOP_ACCESS(vp, VWRITE, cred,
494 ap->a_td);
495 } else
496 error = VOP_ACCESS(vp, VADMIN, cred, ap->a_td);
497 if (vp->v_type != VDIR) {
498 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 &&
499 vap->va_atime.tv_sec != VNOVAL) {
500 dep->de_flag &= ~DE_ACCESS;
501 timespec2fattime(&vap->va_atime, 0,
502 &dep->de_ADate, NULL, NULL);
503 }
504 if (vap->va_mtime.tv_sec != VNOVAL) {
505 dep->de_flag &= ~DE_UPDATE;
506 timespec2fattime(&vap->va_mtime, 0,
507 &dep->de_MDate, &dep->de_MTime, NULL);
508 }
509 dep->de_Attributes |= ATTR_ARCHIVE;
510 dep->de_flag |= DE_MODIFIED;
511 }
512 }
513 /*
514 * DOS files only have the ability to have their writability
515 * attribute set, so we use the owner write bit to set the readonly
516 * attribute.
517 */
518 if (vap->va_mode != (mode_t)VNOVAL) {
519 if (vp->v_mount->mnt_flag & MNT_RDONLY)
520 return (EROFS);
521 if (cred->cr_uid != pmp->pm_uid) {
522 error = priv_check_cred(cred, PRIV_VFS_ADMIN, 0);
523 if (error)
524 return (error);
525 }
526 if (vp->v_type != VDIR) {
527 /* We ignore the read and execute bits. */
528 if (vap->va_mode & VWRITE)
529 dep->de_Attributes &= ~ATTR_READONLY;
530 else
531 dep->de_Attributes |= ATTR_READONLY;
532 dep->de_Attributes |= ATTR_ARCHIVE;
533 dep->de_flag |= DE_MODIFIED;
534 }
535 }
536 return (deupdat(dep, 1));
537 }
538
539 static int
540 msdosfs_read(ap)
541 struct vop_read_args /* {
542 struct vnode *a_vp;
543 struct uio *a_uio;
544 int a_ioflag;
545 struct ucred *a_cred;
546 } */ *ap;
547 {
548 int error = 0;
549 int blsize;
550 int isadir;
551 int orig_resid;
552 u_int n;
553 u_long diff;
554 u_long on;
555 daddr_t lbn;
556 daddr_t rablock;
557 int rasize;
558 int seqcount;
559 struct buf *bp;
560 struct vnode *vp = ap->a_vp;
561 struct denode *dep = VTODE(vp);
562 struct msdosfsmount *pmp = dep->de_pmp;
563 struct uio *uio = ap->a_uio;
564
565 /*
566 * If they didn't ask for any data, then we are done.
567 */
568 orig_resid = uio->uio_resid;
569 if (orig_resid == 0)
570 return (0);
571
572 /*
573 * The caller is supposed to ensure that
574 * uio->uio_offset >= 0 and uio->uio_resid >= 0.
575 * We don't need to check for large offsets as in ffs because
576 * dep->de_FileSize <= DOS_FILESIZE_MAX < OFF_MAX, so large
577 * offsets cannot cause overflow even in theory.
578 */
579
580 seqcount = ap->a_ioflag >> IO_SEQSHIFT;
581
582 isadir = dep->de_Attributes & ATTR_DIRECTORY;
583 do {
584 if (uio->uio_offset >= dep->de_FileSize)
585 break;
586 lbn = de_cluster(pmp, uio->uio_offset);
587 rablock = lbn + 1;
588 blsize = pmp->pm_bpcluster;
589 on = uio->uio_offset & pmp->pm_crbomask;
590 /*
591 * If we are operating on a directory file then be sure to
592 * do i/o with the vnode for the filesystem instead of the
593 * vnode for the directory.
594 */
595 if (isadir) {
596 /* convert cluster # to block # */
597 error = pcbmap(dep, lbn, &lbn, 0, &blsize);
598 if (error == E2BIG) {
599 error = EINVAL;
600 break;
601 } else if (error)
602 break;
603 error = bread(pmp->pm_devvp, lbn, blsize, NOCRED, &bp);
604 } else if (de_cn2off(pmp, rablock) >= dep->de_FileSize) {
605 error = bread(vp, lbn, blsize, NOCRED, &bp);
606 } else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) {
607 error = cluster_read(vp, dep->de_FileSize, lbn, blsize,
608 NOCRED, on + uio->uio_resid, seqcount, &bp);
609 } else if (seqcount > 1) {
610 rasize = blsize;
611 error = breadn(vp, lbn,
612 blsize, &rablock, &rasize, 1, NOCRED, &bp);
613 } else {
614 error = bread(vp, lbn, blsize, NOCRED, &bp);
615 }
616 if (error) {
617 brelse(bp);
618 break;
619 }
620 diff = pmp->pm_bpcluster - on;
621 n = diff > uio->uio_resid ? uio->uio_resid : diff;
622 diff = dep->de_FileSize - uio->uio_offset;
623 if (diff < n)
624 n = diff;
625 diff = blsize - bp->b_resid;
626 if (diff < n)
627 n = diff;
628 error = uiomove(bp->b_data + on, (int) n, uio);
629 brelse(bp);
630 } while (error == 0 && uio->uio_resid > 0 && n != 0);
631 if (!isadir && (error == 0 || uio->uio_resid != orig_resid) &&
632 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0)
633 dep->de_flag |= DE_ACCESS;
634 return (error);
635 }
636
637 /*
638 * Write data to a file or directory.
639 */
640 static int
641 msdosfs_write(ap)
642 struct vop_write_args /* {
643 struct vnode *a_vp;
644 struct uio *a_uio;
645 int a_ioflag;
646 struct ucred *a_cred;
647 } */ *ap;
648 {
649 int n;
650 int croffset;
651 int resid;
652 u_long osize;
653 int error = 0;
654 u_long count;
655 int seqcount;
656 daddr_t bn, lastcn;
657 struct buf *bp;
658 int ioflag = ap->a_ioflag;
659 struct uio *uio = ap->a_uio;
660 struct thread *td = uio->uio_td;
661 struct vnode *vp = ap->a_vp;
662 struct vnode *thisvp;
663 struct denode *dep = VTODE(vp);
664 struct msdosfsmount *pmp = dep->de_pmp;
665 struct ucred *cred = ap->a_cred;
666
667 #ifdef MSDOSFS_DEBUG
668 printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n",
669 vp, uio, ioflag, cred);
670 printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n",
671 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster);
672 #endif
673
674 switch (vp->v_type) {
675 case VREG:
676 if (ioflag & IO_APPEND)
677 uio->uio_offset = dep->de_FileSize;
678 thisvp = vp;
679 break;
680 case VDIR:
681 return EISDIR;
682 default:
683 panic("msdosfs_write(): bad file type");
684 }
685
686 /*
687 * This is needed (unlike in ffs_write()) because we extend the
688 * file outside of the loop but we don't want to extend the file
689 * for writes of 0 bytes.
690 */
691 if (uio->uio_resid == 0)
692 return (0);
693
694 /*
695 * The caller is supposed to ensure that
696 * uio->uio_offset >= 0 and uio->uio_resid >= 0.
697 */
698 if ((uoff_t)uio->uio_offset + uio->uio_resid > DOS_FILESIZE_MAX)
699 return (EFBIG);
700
701 /*
702 * If they've exceeded their filesize limit, tell them about it.
703 */
704 if (td != NULL) {
705 PROC_LOCK(td->td_proc);
706 if ((uoff_t)uio->uio_offset + uio->uio_resid >
707 lim_cur(td->td_proc, RLIMIT_FSIZE)) {
708 psignal(td->td_proc, SIGXFSZ);
709 PROC_UNLOCK(td->td_proc);
710 return (EFBIG);
711 }
712 PROC_UNLOCK(td->td_proc);
713 }
714
715 /*
716 * If the offset we are starting the write at is beyond the end of
717 * the file, then they've done a seek. Unix filesystems allow
718 * files with holes in them, DOS doesn't so we must fill the hole
719 * with zeroed blocks.
720 */
721 if (uio->uio_offset > dep->de_FileSize) {
722 error = deextend(dep, uio->uio_offset, cred);
723 if (error)
724 return (error);
725 }
726
727 /*
728 * Remember some values in case the write fails.
729 */
730 resid = uio->uio_resid;
731 osize = dep->de_FileSize;
732
733 /*
734 * If we write beyond the end of the file, extend it to its ultimate
735 * size ahead of the time to hopefully get a contiguous area.
736 */
737 if (uio->uio_offset + resid > osize) {
738 count = de_clcount(pmp, uio->uio_offset + resid) -
739 de_clcount(pmp, osize);
740 error = extendfile(dep, count, NULL, NULL, 0);
741 if (error && (error != ENOSPC || (ioflag & IO_UNIT)))
742 goto errexit;
743 lastcn = dep->de_fc[FC_LASTFC].fc_frcn;
744 } else
745 lastcn = de_clcount(pmp, osize) - 1;
746
747 seqcount = ioflag >> IO_SEQSHIFT;
748 do {
749 if (de_cluster(pmp, uio->uio_offset) > lastcn) {
750 error = ENOSPC;
751 break;
752 }
753
754 croffset = uio->uio_offset & pmp->pm_crbomask;
755 n = min(uio->uio_resid, pmp->pm_bpcluster - croffset);
756 if (uio->uio_offset + n > dep->de_FileSize) {
757 dep->de_FileSize = uio->uio_offset + n;
758 /* The object size needs to be set before buffer is allocated */
759 vnode_pager_setsize(vp, dep->de_FileSize);
760 }
761
762 bn = de_cluster(pmp, uio->uio_offset);
763 if ((uio->uio_offset & pmp->pm_crbomask) == 0
764 && (de_cluster(pmp, uio->uio_offset + uio->uio_resid)
765 > de_cluster(pmp, uio->uio_offset)
766 || uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) {
767 /*
768 * If either the whole cluster gets written,
769 * or we write the cluster from its start beyond EOF,
770 * then no need to read data from disk.
771 */
772 bp = getblk(thisvp, bn, pmp->pm_bpcluster, 0, 0, 0);
773 vfs_bio_clrbuf(bp);
774 /*
775 * Do the bmap now, since pcbmap needs buffers
776 * for the fat table. (see msdosfs_strategy)
777 */
778 if (bp->b_blkno == bp->b_lblkno) {
779 error = pcbmap(dep, bp->b_lblkno, &bn, 0, 0);
780 if (error)
781 bp->b_blkno = -1;
782 else
783 bp->b_blkno = bn;
784 }
785 if (bp->b_blkno == -1) {
786 brelse(bp);
787 if (!error)
788 error = EIO; /* XXX */
789 break;
790 }
791 } else {
792 /*
793 * The block we need to write into exists, so read it in.
794 */
795 error = bread(thisvp, bn, pmp->pm_bpcluster, cred, &bp);
796 if (error) {
797 brelse(bp);
798 break;
799 }
800 }
801
802 /*
803 * Should these vnode_pager_* functions be done on dir
804 * files?
805 */
806
807 /*
808 * Copy the data from user space into the buf header.
809 */
810 error = uiomove(bp->b_data + croffset, n, uio);
811 if (error) {
812 brelse(bp);
813 break;
814 }
815
816 /* Prepare for clustered writes in some else clauses. */
817 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0)
818 bp->b_flags |= B_CLUSTEROK;
819
820 /*
821 * If IO_SYNC, then each buffer is written synchronously.
822 * Otherwise, if we have a severe page deficiency then
823 * write the buffer asynchronously. Otherwise, if on a
824 * cluster boundary then write the buffer asynchronously,
825 * combining it with contiguous clusters if permitted and
826 * possible, since we don't expect more writes into this
827 * buffer soon. Otherwise, do a delayed write because we
828 * expect more writes into this buffer soon.
829 */
830 if (ioflag & IO_SYNC)
831 (void)bwrite(bp);
832 else if (vm_page_count_severe() || buf_dirty_count_severe())
833 bawrite(bp);
834 else if (n + croffset == pmp->pm_bpcluster) {
835 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0)
836 cluster_write(vp, bp, dep->de_FileSize,
837 seqcount);
838 else
839 bawrite(bp);
840 } else
841 bdwrite(bp);
842 dep->de_flag |= DE_UPDATE;
843 } while (error == 0 && uio->uio_resid > 0);
844
845 /*
846 * If the write failed and they want us to, truncate the file back
847 * to the size it was before the write was attempted.
848 */
849 errexit:
850 if (error) {
851 if (ioflag & IO_UNIT) {
852 detrunc(dep, osize, ioflag & IO_SYNC, NOCRED, NULL);
853 uio->uio_offset -= resid - uio->uio_resid;
854 uio->uio_resid = resid;
855 } else {
856 detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC, NOCRED, NULL);
857 if (uio->uio_resid != resid)
858 error = 0;
859 }
860 } else if (ioflag & IO_SYNC)
861 error = deupdat(dep, 1);
862 return (error);
863 }
864
865 /*
866 * Flush the blocks of a file to disk.
867 *
868 * This function is worthless for vnodes that represent directories. Maybe we
869 * could just do a sync if they try an fsync on a directory file.
870 */
871 static int
872 msdosfs_fsync(ap)
873 struct vop_fsync_args /* {
874 struct vnode *a_vp;
875 struct ucred *a_cred;
876 int a_waitfor;
877 struct thread *a_td;
878 } */ *ap;
879 {
880
881 vop_stdfsync(ap);
882 return (deupdat(VTODE(ap->a_vp), ap->a_waitfor == MNT_WAIT));
883 }
884
885 static int
886 msdosfs_remove(ap)
887 struct vop_remove_args /* {
888 struct vnode *a_dvp;
889 struct vnode *a_vp;
890 struct componentname *a_cnp;
891 } */ *ap;
892 {
893 struct denode *dep = VTODE(ap->a_vp);
894 struct denode *ddep = VTODE(ap->a_dvp);
895 int error;
896
897 if (ap->a_vp->v_type == VDIR)
898 error = EPERM;
899 else
900 error = removede(ddep, dep);
901 #ifdef MSDOSFS_DEBUG
902 printf("msdosfs_remove(), dep %p, v_usecount %d\n", dep, ap->a_vp->v_usecount);
903 #endif
904 return (error);
905 }
906
907 /*
908 * DOS filesystems don't know what links are.
909 */
910 static int
911 msdosfs_link(ap)
912 struct vop_link_args /* {
913 struct vnode *a_tdvp;
914 struct vnode *a_vp;
915 struct componentname *a_cnp;
916 } */ *ap;
917 {
918 return (EOPNOTSUPP);
919 }
920
921 /*
922 * Renames on files require moving the denode to a new hash queue since the
923 * denode's location is used to compute which hash queue to put the file
924 * in. Unless it is a rename in place. For example "mv a b".
925 *
926 * What follows is the basic algorithm:
927 *
928 * if (file move) {
929 * if (dest file exists) {
930 * remove dest file
931 * }
932 * if (dest and src in same directory) {
933 * rewrite name in existing directory slot
934 * } else {
935 * write new entry in dest directory
936 * update offset and dirclust in denode
937 * move denode to new hash chain
938 * clear old directory entry
939 * }
940 * } else {
941 * directory move
942 * if (dest directory exists) {
943 * if (dest is not empty) {
944 * return ENOTEMPTY
945 * }
946 * remove dest directory
947 * }
948 * if (dest and src in same directory) {
949 * rewrite name in existing entry
950 * } else {
951 * be sure dest is not a child of src directory
952 * write entry in dest directory
953 * update "." and ".." in moved directory
954 * clear old directory entry for moved directory
955 * }
956 * }
957 *
958 * On entry:
959 * source's parent directory is unlocked
960 * source file or directory is unlocked
961 * destination's parent directory is locked
962 * destination file or directory is locked if it exists
963 *
964 * On exit:
965 * all denodes should be released
966 */
967 static int
968 msdosfs_rename(ap)
969 struct vop_rename_args /* {
970 struct vnode *a_fdvp;
971 struct vnode *a_fvp;
972 struct componentname *a_fcnp;
973 struct vnode *a_tdvp;
974 struct vnode *a_tvp;
975 struct componentname *a_tcnp;
976 } */ *ap;
977 {
978 struct vnode *tdvp = ap->a_tdvp;
979 struct vnode *fvp = ap->a_fvp;
980 struct vnode *fdvp = ap->a_fdvp;
981 struct vnode *tvp = ap->a_tvp;
982 struct componentname *tcnp = ap->a_tcnp;
983 struct componentname *fcnp = ap->a_fcnp;
984 struct thread *td = fcnp->cn_thread;
985 struct denode *ip, *xp, *dp, *zp;
986 u_char toname[12], oldname[11];
987 u_long from_diroffset, to_diroffset;
988 u_char to_count;
989 int doingdirectory = 0, newparent = 0;
990 int error;
991 u_long cn;
992 daddr_t bn;
993 struct denode *fddep; /* from file's parent directory */
994 struct msdosfsmount *pmp;
995 struct direntry *dotdotp;
996 struct buf *bp;
997
998 fddep = VTODE(ap->a_fdvp);
999 pmp = fddep->de_pmp;
1000
1001 pmp = VFSTOMSDOSFS(fdvp->v_mount);
1002
1003 #ifdef DIAGNOSTIC
1004 if ((tcnp->cn_flags & HASBUF) == 0 ||
1005 (fcnp->cn_flags & HASBUF) == 0)
1006 panic("msdosfs_rename: no name");
1007 #endif
1008 /*
1009 * Check for cross-device rename.
1010 */
1011 if (fvp->v_mount != tdvp->v_mount ||
1012 (tvp && fvp->v_mount != tvp->v_mount)) {
1013 error = EXDEV;
1014 abortit:
1015 if (tdvp == tvp)
1016 vrele(tdvp);
1017 else
1018 vput(tdvp);
1019 if (tvp)
1020 vput(tvp);
1021 vrele(fdvp);
1022 vrele(fvp);
1023 return (error);
1024 }
1025
1026 /*
1027 * If source and dest are the same, do nothing.
1028 */
1029 if (tvp == fvp) {
1030 error = 0;
1031 goto abortit;
1032 }
1033
1034 error = vn_lock(fvp, LK_EXCLUSIVE, td);
1035 if (error)
1036 goto abortit;
1037 dp = VTODE(fdvp);
1038 ip = VTODE(fvp);
1039
1040 /*
1041 * Be sure we are not renaming ".", "..", or an alias of ".". This
1042 * leads to a crippled directory tree. It's pretty tough to do a
1043 * "ls" or "pwd" with the "." directory entry missing, and "cd .."
1044 * doesn't work if the ".." entry is missing.
1045 */
1046 if (ip->de_Attributes & ATTR_DIRECTORY) {
1047 /*
1048 * Avoid ".", "..", and aliases of "." for obvious reasons.
1049 */
1050 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
1051 dp == ip ||
1052 (fcnp->cn_flags & ISDOTDOT) ||
1053 (tcnp->cn_flags & ISDOTDOT) ||
1054 (ip->de_flag & DE_RENAME)) {
1055 VOP_UNLOCK(fvp, 0, td);
1056 error = EINVAL;
1057 goto abortit;
1058 }
1059 ip->de_flag |= DE_RENAME;
1060 doingdirectory++;
1061 }
1062
1063 /*
1064 * When the target exists, both the directory
1065 * and target vnodes are returned locked.
1066 */
1067 dp = VTODE(tdvp);
1068 xp = tvp ? VTODE(tvp) : NULL;
1069 /*
1070 * Remember direntry place to use for destination
1071 */
1072 to_diroffset = dp->de_fndoffset;
1073 to_count = dp->de_fndcnt;
1074
1075 /*
1076 * If ".." must be changed (ie the directory gets a new
1077 * parent) then the source directory must not be in the
1078 * directory heirarchy above the target, as this would
1079 * orphan everything below the source directory. Also
1080 * the user must have write permission in the source so
1081 * as to be able to change "..". We must repeat the call
1082 * to namei, as the parent directory is unlocked by the
1083 * call to doscheckpath().
1084 */
1085 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread);
1086 VOP_UNLOCK(fvp, 0, td);
1087 if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster)
1088 newparent = 1;
1089 if (doingdirectory && newparent) {
1090 if (error) /* write access check above */
1091 goto bad;
1092 if (xp != NULL)
1093 vput(tvp);
1094 /*
1095 * doscheckpath() vput()'s dp,
1096 * so we have to do a relookup afterwards
1097 */
1098 error = doscheckpath(ip, dp);
1099 if (error)
1100 goto out;
1101 if ((tcnp->cn_flags & SAVESTART) == 0)
1102 panic("msdosfs_rename: lost to startdir");
1103 error = relookup(tdvp, &tvp, tcnp);
1104 if (error)
1105 goto out;
1106 dp = VTODE(tdvp);
1107 xp = tvp ? VTODE(tvp) : NULL;
1108 }
1109
1110 if (xp != NULL) {
1111 /*
1112 * Target must be empty if a directory and have no links
1113 * to it. Also, ensure source and target are compatible
1114 * (both directories, or both not directories).
1115 */
1116 if (xp->de_Attributes & ATTR_DIRECTORY) {
1117 if (!dosdirempty(xp)) {
1118 error = ENOTEMPTY;
1119 goto bad;
1120 }
1121 if (!doingdirectory) {
1122 error = ENOTDIR;
1123 goto bad;
1124 }
1125 cache_purge(tdvp);
1126 } else if (doingdirectory) {
1127 error = EISDIR;
1128 goto bad;
1129 }
1130 error = removede(dp, xp);
1131 if (error)
1132 goto bad;
1133 vput(tvp);
1134 xp = NULL;
1135 }
1136
1137 /*
1138 * Convert the filename in tcnp into a dos filename. We copy this
1139 * into the denode and directory entry for the destination
1140 * file/directory.
1141 */
1142 error = uniqdosname(VTODE(tdvp), tcnp, toname);
1143 if (error)
1144 goto abortit;
1145
1146 /*
1147 * Since from wasn't locked at various places above,
1148 * have to do a relookup here.
1149 */
1150 fcnp->cn_flags &= ~MODMASK;
1151 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
1152 if ((fcnp->cn_flags & SAVESTART) == 0)
1153 panic("msdosfs_rename: lost from startdir");
1154 if (!newparent)
1155 VOP_UNLOCK(tdvp, 0, td);
1156 if (relookup(fdvp, &fvp, fcnp) == 0)
1157 vrele(fdvp);
1158 if (fvp == NULL) {
1159 /*
1160 * From name has disappeared.
1161 */
1162 if (doingdirectory)
1163 panic("rename: lost dir entry");
1164 if (newparent)
1165 VOP_UNLOCK(tdvp, 0, td);
1166 vrele(tdvp);
1167 vrele(ap->a_fvp);
1168 return 0;
1169 }
1170 xp = VTODE(fvp);
1171 zp = VTODE(fdvp);
1172 from_diroffset = zp->de_fndoffset;
1173
1174 /*
1175 * Ensure that the directory entry still exists and has not
1176 * changed till now. If the source is a file the entry may
1177 * have been unlinked or renamed. In either case there is
1178 * no further work to be done. If the source is a directory
1179 * then it cannot have been rmdir'ed or renamed; this is
1180 * prohibited by the DE_RENAME flag.
1181 */
1182 if (xp != ip) {
1183 if (doingdirectory)
1184 panic("rename: lost dir entry");
1185 VOP_UNLOCK(fvp, 0, td);
1186 if (newparent)
1187 VOP_UNLOCK(fdvp, 0, td);
1188 vrele(ap->a_fvp);
1189 xp = NULL;
1190 } else {
1191 vrele(fvp);
1192 xp = NULL;
1193
1194 /*
1195 * First write a new entry in the destination
1196 * directory and mark the entry in the source directory
1197 * as deleted. Then move the denode to the correct hash
1198 * chain for its new location in the filesystem. And, if
1199 * we moved a directory, then update its .. entry to point
1200 * to the new parent directory.
1201 */
1202 bcopy(ip->de_Name, oldname, 11);
1203 bcopy(toname, ip->de_Name, 11); /* update denode */
1204 dp->de_fndoffset = to_diroffset;
1205 dp->de_fndcnt = to_count;
1206 error = createde(ip, dp, (struct denode **)0, tcnp);
1207 if (error) {
1208 bcopy(oldname, ip->de_Name, 11);
1209 if (newparent)
1210 VOP_UNLOCK(fdvp, 0, td);
1211 VOP_UNLOCK(fvp, 0, td);
1212 goto bad;
1213 }
1214 ip->de_refcnt++;
1215 zp->de_fndoffset = from_diroffset;
1216 error = removede(zp, ip);
1217 if (error) {
1218 /* XXX should downgrade to ro here, fs is corrupt */
1219 if (newparent)
1220 VOP_UNLOCK(fdvp, 0, td);
1221 VOP_UNLOCK(fvp, 0, td);
1222 goto bad;
1223 }
1224 if (!doingdirectory) {
1225 error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0,
1226 &ip->de_dirclust, 0);
1227 if (error) {
1228 /* XXX should downgrade to ro here, fs is corrupt */
1229 if (newparent)
1230 VOP_UNLOCK(fdvp, 0, td);
1231 VOP_UNLOCK(fvp, 0, td);
1232 goto bad;
1233 }
1234 if (ip->de_dirclust == MSDOSFSROOT)
1235 ip->de_diroffset = to_diroffset;
1236 else
1237 ip->de_diroffset = to_diroffset & pmp->pm_crbomask;
1238 }
1239 reinsert(ip);
1240 if (newparent)
1241 VOP_UNLOCK(fdvp, 0, td);
1242 }
1243
1244 /*
1245 * If we moved a directory to a new parent directory, then we must
1246 * fixup the ".." entry in the moved directory.
1247 */
1248 if (doingdirectory && newparent) {
1249 cn = ip->de_StartCluster;
1250 if (cn == MSDOSFSROOT) {
1251 /* this should never happen */
1252 panic("msdosfs_rename(): updating .. in root directory?");
1253 } else
1254 bn = cntobn(pmp, cn);
1255 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster,
1256 NOCRED, &bp);
1257 if (error) {
1258 /* XXX should downgrade to ro here, fs is corrupt */
1259 brelse(bp);
1260 VOP_UNLOCK(fvp, 0, td);
1261 goto bad;
1262 }
1263 dotdotp = (struct direntry *)bp->b_data + 1;
1264 putushort(dotdotp->deStartCluster, dp->de_StartCluster);
1265 if (FAT32(pmp))
1266 putushort(dotdotp->deHighClust, dp->de_StartCluster >> 16);
1267 error = bwrite(bp);
1268 if (error) {
1269 /* XXX should downgrade to ro here, fs is corrupt */
1270 VOP_UNLOCK(fvp, 0, td);
1271 goto bad;
1272 }
1273 }
1274
1275 VOP_UNLOCK(fvp, 0, td);
1276 bad:
1277 if (xp)
1278 vput(tvp);
1279 vput(tdvp);
1280 out:
1281 ip->de_flag &= ~DE_RENAME;
1282 vrele(fdvp);
1283 vrele(fvp);
1284 return (error);
1285
1286 }
1287
1288 static struct {
1289 struct direntry dot;
1290 struct direntry dotdot;
1291 } dosdirtemplate = {
1292 { ". ", " ", /* the . entry */
1293 ATTR_DIRECTORY, /* file attribute */
1294 0, /* reserved */
1295 0, { 0, 0 }, { 0, 0 }, /* create time & date */
1296 { 0, 0 }, /* access date */
1297 { 0, 0 }, /* high bits of start cluster */
1298 { 210, 4 }, { 210, 4 }, /* modify time & date */
1299 { 0, 0 }, /* startcluster */
1300 { 0, 0, 0, 0 } /* filesize */
1301 },
1302 { ".. ", " ", /* the .. entry */
1303 ATTR_DIRECTORY, /* file attribute */
1304 0, /* reserved */
1305 0, { 0, 0 }, { 0, 0 }, /* create time & date */
1306 { 0, 0 }, /* access date */
1307 { 0, 0 }, /* high bits of start cluster */
1308 { 210, 4 }, { 210, 4 }, /* modify time & date */
1309 { 0, 0 }, /* startcluster */
1310 { 0, 0, 0, 0 } /* filesize */
1311 }
1312 };
1313
1314 static int
1315 msdosfs_mkdir(ap)
1316 struct vop_mkdir_args /* {
1317 struct vnode *a_dvp;
1318 struct vnode **a_vpp;
1319 struvt componentname *a_cnp;
1320 struct vattr *a_vap;
1321 } */ *ap;
1322 {
1323 struct componentname *cnp = ap->a_cnp;
1324 struct denode *dep;
1325 struct denode *pdep = VTODE(ap->a_dvp);
1326 struct direntry *denp;
1327 struct msdosfsmount *pmp = pdep->de_pmp;
1328 struct buf *bp;
1329 u_long newcluster, pcl;
1330 int bn;
1331 int error;
1332 struct denode ndirent;
1333 struct timespec ts;
1334
1335 /*
1336 * If this is the root directory and there is no space left we
1337 * can't do anything. This is because the root directory can not
1338 * change size.
1339 */
1340 if (pdep->de_StartCluster == MSDOSFSROOT
1341 && pdep->de_fndoffset >= pdep->de_FileSize) {
1342 error = ENOSPC;
1343 goto bad2;
1344 }
1345
1346 /*
1347 * Allocate a cluster to hold the about to be created directory.
1348 */
1349 error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL);
1350 if (error)
1351 goto bad2;
1352
1353 bzero(&ndirent, sizeof(ndirent));
1354 ndirent.de_pmp = pmp;
1355 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE;
1356 getnanotime(&ts);
1357 DETIMES(&ndirent, &ts, &ts, &ts);
1358
1359 /*
1360 * Now fill the cluster with the "." and ".." entries. And write
1361 * the cluster to disk. This way it is there for the parent
1362 * directory to be pointing at if there were a crash.
1363 */
1364 bn = cntobn(pmp, newcluster);
1365 /* always succeeds */
1366 bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0, 0);
1367 bzero(bp->b_data, pmp->pm_bpcluster);
1368 bcopy(&dosdirtemplate, bp->b_data, sizeof dosdirtemplate);
1369 denp = (struct direntry *)bp->b_data;
1370 putushort(denp[0].deStartCluster, newcluster);
1371 putushort(denp[0].deCDate, ndirent.de_CDate);
1372 putushort(denp[0].deCTime, ndirent.de_CTime);
1373 denp[0].deCHundredth = ndirent.de_CHun;
1374 putushort(denp[0].deADate, ndirent.de_ADate);
1375 putushort(denp[0].deMDate, ndirent.de_MDate);
1376 putushort(denp[0].deMTime, ndirent.de_MTime);
1377 pcl = pdep->de_StartCluster;
1378 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk)
1379 pcl = 0;
1380 putushort(denp[1].deStartCluster, pcl);
1381 putushort(denp[1].deCDate, ndirent.de_CDate);
1382 putushort(denp[1].deCTime, ndirent.de_CTime);
1383 denp[1].deCHundredth = ndirent.de_CHun;
1384 putushort(denp[1].deADate, ndirent.de_ADate);
1385 putushort(denp[1].deMDate, ndirent.de_MDate);
1386 putushort(denp[1].deMTime, ndirent.de_MTime);
1387 if (FAT32(pmp)) {
1388 putushort(denp[0].deHighClust, newcluster >> 16);
1389 putushort(denp[1].deHighClust, pdep->de_StartCluster >> 16);
1390 }
1391
1392 error = bwrite(bp);
1393 if (error)
1394 goto bad;
1395
1396 /*
1397 * Now build up a directory entry pointing to the newly allocated
1398 * cluster. This will be written to an empty slot in the parent
1399 * directory.
1400 */
1401 #ifdef DIAGNOSTIC
1402 if ((cnp->cn_flags & HASBUF) == 0)
1403 panic("msdosfs_mkdir: no name");
1404 #endif
1405 error = uniqdosname(pdep, cnp, ndirent.de_Name);
1406 if (error)
1407 goto bad;
1408
1409 ndirent.de_Attributes = ATTR_DIRECTORY;
1410 ndirent.de_LowerCase = 0;
1411 ndirent.de_StartCluster = newcluster;
1412 ndirent.de_FileSize = 0;
1413 ndirent.de_dev = pdep->de_dev;
1414 error = createde(&ndirent, pdep, &dep, cnp);
1415 if (error)
1416 goto bad;
1417 *ap->a_vpp = DETOV(dep);
1418 return (0);
1419
1420 bad:
1421 clusterfree(pmp, newcluster, NULL);
1422 bad2:
1423 return (error);
1424 }
1425
1426 static int
1427 msdosfs_rmdir(ap)
1428 struct vop_rmdir_args /* {
1429 struct vnode *a_dvp;
1430 struct vnode *a_vp;
1431 struct componentname *a_cnp;
1432 } */ *ap;
1433 {
1434 struct vnode *vp = ap->a_vp;
1435 struct vnode *dvp = ap->a_dvp;
1436 struct componentname *cnp = ap->a_cnp;
1437 struct denode *ip, *dp;
1438 struct thread *td = cnp->cn_thread;
1439 int error;
1440
1441 ip = VTODE(vp);
1442 dp = VTODE(dvp);
1443
1444 /*
1445 * Verify the directory is empty (and valid).
1446 * (Rmdir ".." won't be valid since
1447 * ".." will contain a reference to
1448 * the current directory and thus be
1449 * non-empty.)
1450 */
1451 error = 0;
1452 if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) {
1453 error = ENOTEMPTY;
1454 goto out;
1455 }
1456 /*
1457 * Delete the entry from the directory. For dos filesystems this
1458 * gets rid of the directory entry on disk, the in memory copy
1459 * still exists but the de_refcnt is <= 0. This prevents it from
1460 * being found by deget(). When the vput() on dep is done we give
1461 * up access and eventually msdosfs_reclaim() will be called which
1462 * will remove it from the denode cache.
1463 */
1464 error = removede(dp, ip);
1465 if (error)
1466 goto out;
1467 /*
1468 * This is where we decrement the link count in the parent
1469 * directory. Since dos filesystems don't do this we just purge
1470 * the name cache.
1471 */
1472 cache_purge(dvp);
1473 VOP_UNLOCK(dvp, 0, td);
1474 /*
1475 * Truncate the directory that is being deleted.
1476 */
1477 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred, td);
1478 cache_purge(vp);
1479
1480 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td);
1481 out:
1482 return (error);
1483 }
1484
1485 /*
1486 * DOS filesystems don't know what symlinks are.
1487 */
1488 static int
1489 msdosfs_symlink(ap)
1490 struct vop_symlink_args /* {
1491 struct vnode *a_dvp;
1492 struct vnode **a_vpp;
1493 struct componentname *a_cnp;
1494 struct vattr *a_vap;
1495 char *a_target;
1496 } */ *ap;
1497 {
1498 return (EOPNOTSUPP);
1499 }
1500
1501 static int
1502 msdosfs_readdir(ap)
1503 struct vop_readdir_args /* {
1504 struct vnode *a_vp;
1505 struct uio *a_uio;
1506 struct ucred *a_cred;
1507 int *a_eofflag;
1508 int *a_ncookies;
1509 u_long **a_cookies;
1510 } */ *ap;
1511 {
1512 struct mbnambuf nb;
1513 int error = 0;
1514 int diff;
1515 long n;
1516 int blsize;
1517 long on;
1518 u_long cn;
1519 uint64_t fileno;
1520 u_long dirsperblk;
1521 long bias = 0;
1522 daddr_t bn, lbn;
1523 struct buf *bp;
1524 struct denode *dep = VTODE(ap->a_vp);
1525 struct msdosfsmount *pmp = dep->de_pmp;
1526 struct direntry *dentp;
1527 struct dirent dirbuf;
1528 struct uio *uio = ap->a_uio;
1529 u_long *cookies = NULL;
1530 int ncookies = 0;
1531 off_t offset, off;
1532 int chksum = -1;
1533
1534 #ifdef MSDOSFS_DEBUG
1535 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n",
1536 ap->a_vp, uio, ap->a_cred, ap->a_eofflag);
1537 #endif
1538
1539 /*
1540 * msdosfs_readdir() won't operate properly on regular files since
1541 * it does i/o only with the filesystem vnode, and hence can
1542 * retrieve the wrong block from the buffer cache for a plain file.
1543 * So, fail attempts to readdir() on a plain file.
1544 */
1545 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0)
1546 return (ENOTDIR);
1547
1548 /*
1549 * To be safe, initialize dirbuf
1550 */
1551 bzero(dirbuf.d_name, sizeof(dirbuf.d_name));
1552
1553 /*
1554 * If the user buffer is smaller than the size of one dos directory
1555 * entry or the file offset is not a multiple of the size of a
1556 * directory entry, then we fail the read.
1557 */
1558 off = offset = uio->uio_offset;
1559 if (uio->uio_resid < sizeof(struct direntry) ||
1560 (offset & (sizeof(struct direntry) - 1)))
1561 return (EINVAL);
1562
1563 if (ap->a_ncookies) {
1564 ncookies = uio->uio_resid / 16;
1565 MALLOC(cookies, u_long *, ncookies * sizeof(u_long), M_TEMP,
1566 M_WAITOK);
1567 *ap->a_cookies = cookies;
1568 *ap->a_ncookies = ncookies;
1569 }
1570
1571 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry);
1572
1573 /*
1574 * If they are reading from the root directory then, we simulate
1575 * the . and .. entries since these don't exist in the root
1576 * directory. We also set the offset bias to make up for having to
1577 * simulate these entries. By this I mean that at file offset 64 we
1578 * read the first entry in the root directory that lives on disk.
1579 */
1580 if (dep->de_StartCluster == MSDOSFSROOT
1581 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) {
1582 #if 0
1583 printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n",
1584 offset);
1585 #endif
1586 bias = 2 * sizeof(struct direntry);
1587 if (offset < bias) {
1588 for (n = (int)offset / sizeof(struct direntry);
1589 n < 2; n++) {
1590 if (FAT32(pmp))
1591 fileno = (uint64_t)cntobn(pmp,
1592 pmp->pm_rootdirblk)
1593 * dirsperblk;
1594 else
1595 fileno = 1;
1596 if (pmp->pm_flags & MSDOSFS_LARGEFS) {
1597 dirbuf.d_fileno =
1598 msdosfs_fileno_map(pmp->pm_mountp,
1599 fileno);
1600 } else {
1601
1602 dirbuf.d_fileno = (uint32_t)fileno;
1603 }
1604 dirbuf.d_type = DT_DIR;
1605 switch (n) {
1606 case 0:
1607 dirbuf.d_namlen = 1;
1608 strcpy(dirbuf.d_name, ".");
1609 break;
1610 case 1:
1611 dirbuf.d_namlen = 2;
1612 strcpy(dirbuf.d_name, "..");
1613 break;
1614 }
1615 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf);
1616 if (uio->uio_resid < dirbuf.d_reclen)
1617 goto out;
1618 error = uiomove(&dirbuf, dirbuf.d_reclen, uio);
1619 if (error)
1620 goto out;
1621 offset += sizeof(struct direntry);
1622 off = offset;
1623 if (cookies) {
1624 *cookies++ = offset;
1625 if (--ncookies <= 0)
1626 goto out;
1627 }
1628 }
1629 }
1630 }
1631
1632 mbnambuf_init(&nb);
1633 off = offset;
1634 while (uio->uio_resid > 0) {
1635 lbn = de_cluster(pmp, offset - bias);
1636 on = (offset - bias) & pmp->pm_crbomask;
1637 n = min(pmp->pm_bpcluster - on, uio->uio_resid);
1638 diff = dep->de_FileSize - (offset - bias);
1639 if (diff <= 0)
1640 break;
1641 n = min(n, diff);
1642 error = pcbmap(dep, lbn, &bn, &cn, &blsize);
1643 if (error)
1644 break;
1645 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp);
1646 if (error) {
1647 brelse(bp);
1648 return (error);
1649 }
1650 n = min(n, blsize - bp->b_resid);
1651 if (n == 0) {
1652 brelse(bp);
1653 return (EIO);
1654 }
1655
1656 /*
1657 * Convert from dos directory entries to fs-independent
1658 * directory entries.
1659 */
1660 for (dentp = (struct direntry *)(bp->b_data + on);
1661 (char *)dentp < bp->b_data + on + n;
1662 dentp++, offset += sizeof(struct direntry)) {
1663 #if 0
1664 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n",
1665 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes);
1666 #endif
1667 /*
1668 * If this is an unused entry, we can stop.
1669 */
1670 if (dentp->deName[0] == SLOT_EMPTY) {
1671 brelse(bp);
1672 goto out;
1673 }
1674 /*
1675 * Skip deleted entries.
1676 */
1677 if (dentp->deName[0] == SLOT_DELETED) {
1678 chksum = -1;
1679 mbnambuf_init(&nb);
1680 continue;
1681 }
1682
1683 /*
1684 * Handle Win95 long directory entries
1685 */
1686 if (dentp->deAttributes == ATTR_WIN95) {
1687 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME)
1688 continue;
1689 chksum = win2unixfn(&nb,
1690 (struct winentry *)dentp, chksum, pmp);
1691 continue;
1692 }
1693
1694 /*
1695 * Skip volume labels
1696 */
1697 if (dentp->deAttributes & ATTR_VOLUME) {
1698 chksum = -1;
1699 mbnambuf_init(&nb);
1700 continue;
1701 }
1702 /*
1703 * This computation of d_fileno must match
1704 * the computation of va_fileid in
1705 * msdosfs_getattr.
1706 */
1707 if (dentp->deAttributes & ATTR_DIRECTORY) {
1708 fileno = getushort(dentp->deStartCluster);
1709 if (FAT32(pmp))
1710 fileno |= getushort(dentp->deHighClust) << 16;
1711 /* if this is the root directory */
1712 if (fileno == MSDOSFSROOT)
1713 if (FAT32(pmp))
1714 fileno = (uint64_t)cntobn(pmp,
1715 pmp->pm_rootdirblk)
1716 * dirsperblk;
1717 else
1718 fileno = 1;
1719 else
1720 fileno = (uint64_t)cntobn(pmp, fileno) *
1721 dirsperblk;
1722 dirbuf.d_type = DT_DIR;
1723 } else {
1724 fileno = (uoff_t)offset /
1725 sizeof(struct direntry);
1726 dirbuf.d_type = DT_REG;
1727 }
1728 if (pmp->pm_flags & MSDOSFS_LARGEFS) {
1729 dirbuf.d_fileno =
1730 msdosfs_fileno_map(pmp->pm_mountp, fileno);
1731 } else
1732 dirbuf.d_fileno = (uint32_t)fileno;
1733
1734 if (chksum != winChksum(dentp)) {
1735 dirbuf.d_namlen = dos2unixfn(dentp->deName,
1736 (u_char *)dirbuf.d_name,
1737 dentp->deLowerCase |
1738 ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ?
1739 (LCASE_BASE | LCASE_EXT) : 0),
1740 pmp);
1741 mbnambuf_init(&nb);
1742 } else
1743 mbnambuf_flush(&nb, &dirbuf);
1744 chksum = -1;
1745 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf);
1746 if (uio->uio_resid < dirbuf.d_reclen) {
1747 brelse(bp);
1748 goto out;
1749 }
1750 error = uiomove(&dirbuf, dirbuf.d_reclen, uio);
1751 if (error) {
1752 brelse(bp);
1753 goto out;
1754 }
1755 if (cookies) {
1756 *cookies++ = offset + sizeof(struct direntry);
1757 if (--ncookies <= 0) {
1758 brelse(bp);
1759 goto out;
1760 }
1761 }
1762 off = offset + sizeof(struct direntry);
1763 }
1764 brelse(bp);
1765 }
1766 out:
1767 /* Subtract unused cookies */
1768 if (ap->a_ncookies)
1769 *ap->a_ncookies -= ncookies;
1770
1771 uio->uio_offset = off;
1772
1773 /*
1774 * Set the eofflag (NFS uses it)
1775 */
1776 if (ap->a_eofflag) {
1777 if (dep->de_FileSize - (offset - bias) <= 0)
1778 *ap->a_eofflag = 1;
1779 else
1780 *ap->a_eofflag = 0;
1781 }
1782 return (error);
1783 }
1784
1785 /*-
1786 * a_vp - pointer to the file's vnode
1787 * a_bn - logical block number within the file (cluster number for us)
1788 * a_bop - where to return the bufobj of the special file containing the fs
1789 * a_bnp - where to return the "physical" block number corresponding to a_bn
1790 * (relative to the special file; units are blocks of size DEV_BSIZE)
1791 * a_runp - where to return the "run past" a_bn. This is the count of logical
1792 * blocks whose physical blocks (together with a_bn's physical block)
1793 * are contiguous.
1794 * a_runb - where to return the "run before" a_bn.
1795 */
1796 static int
1797 msdosfs_bmap(ap)
1798 struct vop_bmap_args /* {
1799 struct vnode *a_vp;
1800 daddr_t a_bn;
1801 struct bufobj **a_bop;
1802 daddr_t *a_bnp;
1803 int *a_runp;
1804 int *a_runb;
1805 } */ *ap;
1806 {
1807 struct denode *dep;
1808 struct mount *mp;
1809 struct msdosfsmount *pmp;
1810 struct vnode *vp;
1811 daddr_t runbn;
1812 u_long cn;
1813 int bnpercn, error, maxio, maxrun, run;
1814
1815 vp = ap->a_vp;
1816 dep = VTODE(vp);
1817 pmp = dep->de_pmp;
1818 if (ap->a_bop != NULL)
1819 *ap->a_bop = &pmp->pm_devvp->v_bufobj;
1820 if (ap->a_bnp == NULL)
1821 return (0);
1822 if (ap->a_runp != NULL)
1823 *ap->a_runp = 0;
1824 if (ap->a_runb != NULL)
1825 *ap->a_runb = 0;
1826 cn = ap->a_bn;
1827 if (cn != ap->a_bn)
1828 return (EFBIG);
1829 error = pcbmap(dep, cn, ap->a_bnp, NULL, NULL);
1830 if (error != 0 || (ap->a_runp == NULL && ap->a_runb == NULL))
1831 return (error);
1832
1833 mp = vp->v_mount;
1834 maxio = mp->mnt_iosize_max / mp->mnt_stat.f_iosize;
1835 bnpercn = de_cn2bn(pmp, 1);
1836 if (ap->a_runp != NULL) {
1837 maxrun = ulmin(maxio - 1, pmp->pm_maxcluster - cn);
1838 for (run = 1; run <= maxrun; run++) {
1839 if (pcbmap(dep, cn + run, &runbn, NULL, NULL) != 0 ||
1840 runbn != *ap->a_bnp + run * bnpercn)
1841 break;
1842 }
1843 *ap->a_runp = run - 1;
1844 }
1845 if (ap->a_runb != NULL) {
1846 maxrun = ulmin(maxio - 1, cn);
1847 for (run = 1; run < maxrun; run++) {
1848 if (pcbmap(dep, cn - run, &runbn, NULL, NULL) != 0 ||
1849 runbn != *ap->a_bnp - run * bnpercn)
1850 break;
1851 }
1852 *ap->a_runb = run - 1;
1853 }
1854 return (0);
1855 }
1856
1857 static int
1858 msdosfs_strategy(ap)
1859 struct vop_strategy_args /* {
1860 struct vnode *a_vp;
1861 struct buf *a_bp;
1862 } */ *ap;
1863 {
1864 struct buf *bp = ap->a_bp;
1865 struct denode *dep = VTODE(ap->a_vp);
1866 struct bufobj *bo;
1867 int error = 0;
1868 daddr_t blkno;
1869
1870 /*
1871 * If we don't already know the filesystem relative block number
1872 * then get it using pcbmap(). If pcbmap() returns the block
1873 * number as -1 then we've got a hole in the file. DOS filesystems
1874 * don't allow files with holes, so we shouldn't ever see this.
1875 */
1876 if (bp->b_blkno == bp->b_lblkno) {
1877 error = pcbmap(dep, bp->b_lblkno, &blkno, 0, 0);
1878 bp->b_blkno = blkno;
1879 if (error) {
1880 bp->b_error = error;
1881 bp->b_ioflags |= BIO_ERROR;
1882 bufdone(bp);
1883 return (0);
1884 }
1885 if ((long)bp->b_blkno == -1)
1886 vfs_bio_clrbuf(bp);
1887 }
1888 if (bp->b_blkno == -1) {
1889 bufdone(bp);
1890 return (0);
1891 }
1892 /*
1893 * Read/write the block from/to the disk that contains the desired
1894 * file block.
1895 */
1896 bp->b_iooffset = dbtob(bp->b_blkno);
1897 bo = dep->de_pmp->pm_bo;
1898 BO_STRATEGY(bo, bp);
1899 return (0);
1900 }
1901
1902 static int
1903 msdosfs_print(ap)
1904 struct vop_print_args /* {
1905 struct vnode *vp;
1906 } */ *ap;
1907 {
1908 struct denode *dep = VTODE(ap->a_vp);
1909
1910 printf("\tstartcluster %lu, dircluster %lu, diroffset %lu, ",
1911 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset);
1912 printf("on dev %s\n", devtoname(dep->de_dev));
1913 return (0);
1914 }
1915
1916 static int
1917 msdosfs_pathconf(ap)
1918 struct vop_pathconf_args /* {
1919 struct vnode *a_vp;
1920 int a_name;
1921 int *a_retval;
1922 } */ *ap;
1923 {
1924 struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp;
1925
1926 switch (ap->a_name) {
1927 case _PC_LINK_MAX:
1928 *ap->a_retval = 1;
1929 return (0);
1930 case _PC_NAME_MAX:
1931 *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12;
1932 return (0);
1933 case _PC_PATH_MAX:
1934 *ap->a_retval = PATH_MAX;
1935 return (0);
1936 case _PC_CHOWN_RESTRICTED:
1937 *ap->a_retval = 1;
1938 return (0);
1939 case _PC_NO_TRUNC:
1940 *ap->a_retval = 0;
1941 return (0);
1942 default:
1943 return (EINVAL);
1944 }
1945 /* NOTREACHED */
1946 }
1947
1948 static int
1949 msdosfs_vptofh(ap)
1950 struct vop_vptofh_args /* {
1951 struct vnode *a_vp;
1952 struct fid *a_fhp;
1953 } */ *ap;
1954 {
1955 struct denode *dep;
1956 struct defid *defhp;
1957
1958 dep = VTODE(ap->a_vp);
1959 defhp = (struct defid *)ap->a_fhp;
1960 defhp->defid_len = sizeof(struct defid);
1961 defhp->defid_dirclust = dep->de_dirclust;
1962 defhp->defid_dirofs = dep->de_diroffset;
1963 /* defhp->defid_gen = dep->de_gen; */
1964 return (0);
1965 }
1966
1967 /* Global vfs data structures for msdosfs */
1968 struct vop_vector msdosfs_vnodeops = {
1969 .vop_default = &default_vnodeops,
1970
1971 .vop_access = msdosfs_access,
1972 .vop_bmap = msdosfs_bmap,
1973 .vop_cachedlookup = msdosfs_lookup,
1974 .vop_open = msdosfs_open,
1975 .vop_close = msdosfs_close,
1976 .vop_create = msdosfs_create,
1977 .vop_fsync = msdosfs_fsync,
1978 .vop_getattr = msdosfs_getattr,
1979 .vop_inactive = msdosfs_inactive,
1980 .vop_link = msdosfs_link,
1981 .vop_lookup = vfs_cache_lookup,
1982 .vop_mkdir = msdosfs_mkdir,
1983 .vop_mknod = msdosfs_mknod,
1984 .vop_pathconf = msdosfs_pathconf,
1985 .vop_print = msdosfs_print,
1986 .vop_read = msdosfs_read,
1987 .vop_readdir = msdosfs_readdir,
1988 .vop_reclaim = msdosfs_reclaim,
1989 .vop_remove = msdosfs_remove,
1990 .vop_rename = msdosfs_rename,
1991 .vop_rmdir = msdosfs_rmdir,
1992 .vop_setattr = msdosfs_setattr,
1993 .vop_strategy = msdosfs_strategy,
1994 .vop_symlink = msdosfs_symlink,
1995 .vop_write = msdosfs_write,
1996 .vop_vptofh = msdosfs_vptofh,
1997 };
Cache object: d68df1883683f93e3c6206ef02042a52
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