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/stat.h>
65 #include <sys/sysctl.h>
66 #include <sys/unistd.h>
67 #include <sys/vmmeter.h>
68 #include <sys/vnode.h>
69
70 #include <vm/vm.h>
71 #include <vm/vm_extern.h>
72 #include <vm/vnode_pager.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_getpages_t msdosfs_getpages;
104 static vop_strategy_t msdosfs_strategy;
105 static vop_print_t msdosfs_print;
106 static vop_pathconf_t msdosfs_pathconf;
107 static vop_vptofh_t msdosfs_vptofh;
108
109 /*
110 * Some general notes:
111 *
112 * In the ufs filesystem the inodes, superblocks, and indirect blocks are
113 * read/written using the vnode for the filesystem. Blocks that represent
114 * the contents of a file are read/written using the vnode for the file
115 * (including directories when they are read/written as files). This
116 * presents problems for the dos filesystem because data that should be in
117 * an inode (if dos had them) resides in the directory itself. Since we
118 * must update directory entries without the benefit of having the vnode
119 * for the directory we must use the vnode for the filesystem. This means
120 * that when a directory is actually read/written (via read, write, or
121 * readdir, or seek) we must use the vnode for the filesystem instead of
122 * the vnode for the directory as would happen in ufs. This is to insure we
123 * retrieve the correct block from the buffer cache since the hash value is
124 * based upon the vnode address and the desired block number.
125 */
126
127 /*
128 * Create a regular file. On entry the directory to contain the file being
129 * created is locked. We must release before we return. We must also free
130 * the pathname buffer pointed at by cnp->cn_pnbuf, always on error, or
131 * only if the SAVESTART bit in cn_flags is clear on success.
132 */
133 static int
134 msdosfs_create(struct vop_create_args *ap)
135 {
136 struct componentname *cnp = ap->a_cnp;
137 struct denode ndirent;
138 struct denode *dep;
139 struct denode *pdep = VTODE(ap->a_dvp);
140 struct timespec ts;
141 int error;
142
143 #ifdef MSDOSFS_DEBUG
144 printf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap);
145 #endif
146
147 /*
148 * If this is the root directory and there is no space left we
149 * can't do anything. This is because the root directory can not
150 * change size.
151 */
152 if (pdep->de_StartCluster == MSDOSFSROOT
153 && pdep->de_fndoffset >= pdep->de_FileSize) {
154 error = ENOSPC;
155 goto bad;
156 }
157
158 /*
159 * Create a directory entry for the file, then call createde() to
160 * have it installed. NOTE: DOS files are always executable. We
161 * use the absence of the owner write bit to make the file
162 * readonly.
163 */
164 #ifdef DIAGNOSTIC
165 if ((cnp->cn_flags & HASBUF) == 0)
166 panic("msdosfs_create: no name");
167 #endif
168 bzero(&ndirent, sizeof(ndirent));
169 error = uniqdosname(pdep, cnp, ndirent.de_Name);
170 if (error)
171 goto bad;
172
173 ndirent.de_Attributes = ATTR_ARCHIVE;
174 ndirent.de_LowerCase = 0;
175 ndirent.de_StartCluster = 0;
176 ndirent.de_FileSize = 0;
177 ndirent.de_pmp = pdep->de_pmp;
178 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE;
179 vfs_timestamp(&ts);
180 DETIMES(&ndirent, &ts, &ts, &ts);
181 error = createde(&ndirent, pdep, &dep, cnp);
182 if (error)
183 goto bad;
184 *ap->a_vpp = DETOV(dep);
185 if ((cnp->cn_flags & MAKEENTRY) != 0)
186 cache_enter(ap->a_dvp, *ap->a_vpp, cnp);
187 return (0);
188
189 bad:
190 return (error);
191 }
192
193 static int
194 msdosfs_mknod(struct vop_mknod_args *ap)
195 {
196
197 return (EINVAL);
198 }
199
200 static int
201 msdosfs_open(struct vop_open_args *ap)
202 {
203 struct denode *dep = VTODE(ap->a_vp);
204 vnode_create_vobject(ap->a_vp, dep->de_FileSize, ap->a_td);
205 return 0;
206 }
207
208 static int
209 msdosfs_close(struct vop_close_args *ap)
210 {
211 struct vnode *vp = ap->a_vp;
212 struct denode *dep = VTODE(vp);
213 struct timespec ts;
214
215 VI_LOCK(vp);
216 if (vp->v_usecount > 1) {
217 vfs_timestamp(&ts);
218 DETIMES(dep, &ts, &ts, &ts);
219 }
220 VI_UNLOCK(vp);
221 return 0;
222 }
223
224 static int
225 msdosfs_access(struct vop_access_args *ap)
226 {
227 struct vnode *vp = ap->a_vp;
228 struct denode *dep = VTODE(ap->a_vp);
229 struct msdosfsmount *pmp = dep->de_pmp;
230 mode_t file_mode;
231 accmode_t accmode = ap->a_accmode;
232
233 file_mode = S_IRWXU|S_IRWXG|S_IRWXO;
234 file_mode &= (vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask);
235
236 /*
237 * Disallow writing to directories and regular files if the
238 * filesystem is read-only.
239 */
240 if (accmode & VWRITE) {
241 switch (vp->v_type) {
242 case VREG:
243 case VDIR:
244 if (vp->v_mount->mnt_flag & MNT_RDONLY)
245 return (EROFS);
246 break;
247 default:
248 break;
249 }
250 }
251
252 return (vaccess(vp->v_type, file_mode, pmp->pm_uid, pmp->pm_gid,
253 ap->a_accmode, ap->a_cred, NULL));
254 }
255
256 static int
257 msdosfs_getattr(struct vop_getattr_args *ap)
258 {
259 struct denode *dep = VTODE(ap->a_vp);
260 struct msdosfsmount *pmp = dep->de_pmp;
261 struct vattr *vap = ap->a_vap;
262 mode_t mode;
263 struct timespec ts;
264 u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry);
265 uint64_t fileid;
266
267 vfs_timestamp(&ts);
268 DETIMES(dep, &ts, &ts, &ts);
269 vap->va_fsid = dev2udev(pmp->pm_dev);
270 /*
271 * The following computation of the fileid must be the same as that
272 * used in msdosfs_readdir() to compute d_fileno. If not, pwd
273 * doesn't work.
274 */
275 if (dep->de_Attributes & ATTR_DIRECTORY) {
276 fileid = (uint64_t)cntobn(pmp, dep->de_StartCluster) *
277 dirsperblk;
278 if (dep->de_StartCluster == MSDOSFSROOT)
279 fileid = 1;
280 } else {
281 fileid = (uint64_t)cntobn(pmp, dep->de_dirclust) *
282 dirsperblk;
283 if (dep->de_dirclust == MSDOSFSROOT)
284 fileid = (uint64_t)roottobn(pmp, 0) * dirsperblk;
285 fileid += (uoff_t)dep->de_diroffset / sizeof(struct direntry);
286 }
287
288 if (pmp->pm_flags & MSDOSFS_LARGEFS)
289 vap->va_fileid = msdosfs_fileno_map(pmp->pm_mountp, fileid);
290 else
291 vap->va_fileid = (long)fileid;
292
293 mode = S_IRWXU|S_IRWXG|S_IRWXO;
294 vap->va_mode = mode &
295 (ap->a_vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask);
296 vap->va_uid = pmp->pm_uid;
297 vap->va_gid = pmp->pm_gid;
298 vap->va_nlink = 1;
299 vap->va_rdev = NODEV;
300 vap->va_size = dep->de_FileSize;
301 fattime2timespec(dep->de_MDate, dep->de_MTime, 0, 0, &vap->va_mtime);
302 vap->va_ctime = vap->va_mtime;
303 if (pmp->pm_flags & MSDOSFSMNT_LONGNAME) {
304 fattime2timespec(dep->de_ADate, 0, 0, 0, &vap->va_atime);
305 fattime2timespec(dep->de_CDate, dep->de_CTime, dep->de_CHun,
306 0, &vap->va_birthtime);
307 } else {
308 vap->va_atime = vap->va_mtime;
309 vap->va_birthtime.tv_sec = -1;
310 vap->va_birthtime.tv_nsec = 0;
311 }
312 vap->va_flags = 0;
313 if (dep->de_Attributes & ATTR_ARCHIVE)
314 vap->va_flags |= UF_ARCHIVE;
315 if (dep->de_Attributes & ATTR_HIDDEN)
316 vap->va_flags |= UF_HIDDEN;
317 if (dep->de_Attributes & ATTR_READONLY)
318 vap->va_flags |= UF_READONLY;
319 if (dep->de_Attributes & ATTR_SYSTEM)
320 vap->va_flags |= UF_SYSTEM;
321 vap->va_gen = 0;
322 vap->va_blocksize = pmp->pm_bpcluster;
323 vap->va_bytes =
324 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask;
325 vap->va_type = ap->a_vp->v_type;
326 vap->va_filerev = dep->de_modrev;
327 return (0);
328 }
329
330 static int
331 msdosfs_setattr(struct vop_setattr_args *ap)
332 {
333 struct vnode *vp = ap->a_vp;
334 struct denode *dep = VTODE(ap->a_vp);
335 struct msdosfsmount *pmp = dep->de_pmp;
336 struct vattr *vap = ap->a_vap;
337 struct ucred *cred = ap->a_cred;
338 struct thread *td = curthread;
339 int error = 0;
340
341 #ifdef MSDOSFS_DEBUG
342 printf("msdosfs_setattr(): vp %p, vap %p, cred %p\n",
343 ap->a_vp, vap, cred);
344 #endif
345
346 /*
347 * Check for unsettable attributes.
348 */
349 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
350 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
351 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
352 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
353 #ifdef MSDOSFS_DEBUG
354 printf("msdosfs_setattr(): returning EINVAL\n");
355 printf(" va_type %d, va_nlink %x, va_fsid %lx, va_fileid %lx\n",
356 vap->va_type, vap->va_nlink, vap->va_fsid, vap->va_fileid);
357 printf(" va_blocksize %lx, va_rdev %x, va_bytes %qx, va_gen %lx\n",
358 vap->va_blocksize, vap->va_rdev, vap->va_bytes, vap->va_gen);
359 printf(" va_uid %x, va_gid %x\n",
360 vap->va_uid, vap->va_gid);
361 #endif
362 return (EINVAL);
363 }
364
365 /*
366 * We don't allow setting attributes on the root directory.
367 * The special case for the root directory is because before
368 * FAT32, the root directory didn't have an entry for itself
369 * (and was otherwise special). With FAT32, the root
370 * directory is not so special, but still doesn't have an
371 * entry for itself.
372 */
373 if (vp->v_vflag & VV_ROOT)
374 return (EINVAL);
375
376 if (vap->va_flags != VNOVAL) {
377 if (vp->v_mount->mnt_flag & MNT_RDONLY)
378 return (EROFS);
379 if (cred->cr_uid != pmp->pm_uid) {
380 error = priv_check_cred(cred, PRIV_VFS_ADMIN, 0);
381 if (error)
382 return (error);
383 }
384 /*
385 * We are very inconsistent about handling unsupported
386 * attributes. We ignored the access time and the
387 * read and execute bits. We were strict for the other
388 * attributes.
389 */
390 if (vap->va_flags & ~(UF_ARCHIVE | UF_HIDDEN | UF_READONLY |
391 UF_SYSTEM))
392 return EOPNOTSUPP;
393 if (vap->va_flags & UF_ARCHIVE)
394 dep->de_Attributes |= ATTR_ARCHIVE;
395 else
396 dep->de_Attributes &= ~ATTR_ARCHIVE;
397 if (vap->va_flags & UF_HIDDEN)
398 dep->de_Attributes |= ATTR_HIDDEN;
399 else
400 dep->de_Attributes &= ~ATTR_HIDDEN;
401 /* We don't allow changing the readonly bit on directories. */
402 if (vp->v_type != VDIR) {
403 if (vap->va_flags & UF_READONLY)
404 dep->de_Attributes |= ATTR_READONLY;
405 else
406 dep->de_Attributes &= ~ATTR_READONLY;
407 }
408 if (vap->va_flags & UF_SYSTEM)
409 dep->de_Attributes |= ATTR_SYSTEM;
410 else
411 dep->de_Attributes &= ~ATTR_SYSTEM;
412 dep->de_flag |= DE_MODIFIED;
413 }
414
415 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
416 uid_t uid;
417 gid_t gid;
418
419 if (vp->v_mount->mnt_flag & MNT_RDONLY)
420 return (EROFS);
421 uid = vap->va_uid;
422 if (uid == (uid_t)VNOVAL)
423 uid = pmp->pm_uid;
424 gid = vap->va_gid;
425 if (gid == (gid_t)VNOVAL)
426 gid = pmp->pm_gid;
427 if (cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid ||
428 (gid != pmp->pm_gid && !groupmember(gid, cred))) {
429 error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0);
430 if (error)
431 return (error);
432 }
433 if (uid != pmp->pm_uid || gid != pmp->pm_gid)
434 return EINVAL;
435 }
436
437 if (vap->va_size != VNOVAL) {
438 switch (vp->v_type) {
439 case VDIR:
440 return (EISDIR);
441 case VREG:
442 /*
443 * Truncation is only supported for regular files,
444 * Disallow it if the filesystem is read-only.
445 */
446 if (vp->v_mount->mnt_flag & MNT_RDONLY)
447 return (EROFS);
448 break;
449 default:
450 /*
451 * According to POSIX, the result is unspecified
452 * for file types other than regular files,
453 * directories and shared memory objects. We
454 * don't support any file types except regular
455 * files and directories in this file system, so
456 * this (default) case is unreachable and can do
457 * anything. Keep falling through to detrunc()
458 * for now.
459 */
460 break;
461 }
462 error = detrunc(dep, vap->va_size, 0, cred);
463 if (error)
464 return error;
465 }
466 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
467 if (vp->v_mount->mnt_flag & MNT_RDONLY)
468 return (EROFS);
469 error = vn_utimes_perm(vp, vap, cred, td);
470 if (error != 0)
471 return (error);
472 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 &&
473 vap->va_atime.tv_sec != VNOVAL) {
474 dep->de_flag &= ~DE_ACCESS;
475 timespec2fattime(&vap->va_atime, 0,
476 &dep->de_ADate, NULL, NULL);
477 }
478 if (vap->va_mtime.tv_sec != VNOVAL) {
479 dep->de_flag &= ~DE_UPDATE;
480 timespec2fattime(&vap->va_mtime, 0,
481 &dep->de_MDate, &dep->de_MTime, NULL);
482 }
483 /*
484 * We don't set the archive bit when modifying the time of
485 * a directory to emulate the Windows/DOS behavior.
486 */
487 if (vp->v_type != VDIR)
488 dep->de_Attributes |= ATTR_ARCHIVE;
489 dep->de_flag |= DE_MODIFIED;
490 }
491 /*
492 * DOS files only have the ability to have their writability
493 * attribute set, so we use the owner write bit to set the readonly
494 * attribute.
495 */
496 if (vap->va_mode != (mode_t)VNOVAL) {
497 if (vp->v_mount->mnt_flag & MNT_RDONLY)
498 return (EROFS);
499 if (cred->cr_uid != pmp->pm_uid) {
500 error = priv_check_cred(cred, PRIV_VFS_ADMIN, 0);
501 if (error)
502 return (error);
503 }
504 if (vp->v_type != VDIR) {
505 /* We ignore the read and execute bits. */
506 if (vap->va_mode & VWRITE)
507 dep->de_Attributes &= ~ATTR_READONLY;
508 else
509 dep->de_Attributes |= ATTR_READONLY;
510 dep->de_Attributes |= ATTR_ARCHIVE;
511 dep->de_flag |= DE_MODIFIED;
512 }
513 }
514 return (deupdat(dep, 0));
515 }
516
517 static int
518 msdosfs_read(struct vop_read_args *ap)
519 {
520 int error = 0;
521 int blsize;
522 int isadir;
523 ssize_t orig_resid;
524 u_int n;
525 u_long diff;
526 u_long on;
527 daddr_t lbn;
528 daddr_t rablock;
529 int rasize;
530 int seqcount;
531 struct buf *bp;
532 struct vnode *vp = ap->a_vp;
533 struct denode *dep = VTODE(vp);
534 struct msdosfsmount *pmp = dep->de_pmp;
535 struct uio *uio = ap->a_uio;
536
537 /*
538 * If they didn't ask for any data, then we are done.
539 */
540 orig_resid = uio->uio_resid;
541 if (orig_resid == 0)
542 return (0);
543
544 /*
545 * The caller is supposed to ensure that
546 * uio->uio_offset >= 0 and uio->uio_resid >= 0.
547 * We don't need to check for large offsets as in ffs because
548 * dep->de_FileSize <= DOS_FILESIZE_MAX < OFF_MAX, so large
549 * offsets cannot cause overflow even in theory.
550 */
551
552 seqcount = ap->a_ioflag >> IO_SEQSHIFT;
553
554 isadir = dep->de_Attributes & ATTR_DIRECTORY;
555 do {
556 if (uio->uio_offset >= dep->de_FileSize)
557 break;
558 lbn = de_cluster(pmp, uio->uio_offset);
559 rablock = lbn + 1;
560 blsize = pmp->pm_bpcluster;
561 on = uio->uio_offset & pmp->pm_crbomask;
562 /*
563 * If we are operating on a directory file then be sure to
564 * do i/o with the vnode for the filesystem instead of the
565 * vnode for the directory.
566 */
567 if (isadir) {
568 /* convert cluster # to block # */
569 error = pcbmap(dep, lbn, &lbn, 0, &blsize);
570 if (error == E2BIG) {
571 error = EINVAL;
572 break;
573 } else if (error)
574 break;
575 error = bread(pmp->pm_devvp, lbn, blsize, NOCRED, &bp);
576 } else if (de_cn2off(pmp, rablock) >= dep->de_FileSize) {
577 error = bread(vp, lbn, blsize, NOCRED, &bp);
578 } else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) {
579 error = cluster_read(vp, dep->de_FileSize, lbn, blsize,
580 NOCRED, on + uio->uio_resid, seqcount, 0, &bp);
581 } else if (seqcount > 1) {
582 rasize = blsize;
583 error = breadn(vp, lbn,
584 blsize, &rablock, &rasize, 1, NOCRED, &bp);
585 } else {
586 error = bread(vp, lbn, blsize, NOCRED, &bp);
587 }
588 if (error) {
589 brelse(bp);
590 break;
591 }
592 diff = pmp->pm_bpcluster - on;
593 n = diff > uio->uio_resid ? uio->uio_resid : diff;
594 diff = dep->de_FileSize - uio->uio_offset;
595 if (diff < n)
596 n = diff;
597 diff = blsize - bp->b_resid;
598 if (diff < n)
599 n = diff;
600 error = vn_io_fault_uiomove(bp->b_data + on, (int) n, uio);
601 brelse(bp);
602 } while (error == 0 && uio->uio_resid > 0 && n != 0);
603 if (!isadir && (error == 0 || uio->uio_resid != orig_resid) &&
604 (vp->v_mount->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0)
605 dep->de_flag |= DE_ACCESS;
606 return (error);
607 }
608
609 /*
610 * Write data to a file or directory.
611 */
612 static int
613 msdosfs_write(struct vop_write_args *ap)
614 {
615 int n;
616 int croffset;
617 ssize_t resid;
618 u_long osize;
619 int error = 0;
620 u_long count;
621 int seqcount;
622 daddr_t bn, lastcn;
623 struct buf *bp;
624 int ioflag = ap->a_ioflag;
625 struct uio *uio = ap->a_uio;
626 struct vnode *vp = ap->a_vp;
627 struct vnode *thisvp;
628 struct denode *dep = VTODE(vp);
629 struct msdosfsmount *pmp = dep->de_pmp;
630 struct ucred *cred = ap->a_cred;
631
632 #ifdef MSDOSFS_DEBUG
633 printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n",
634 vp, uio, ioflag, cred);
635 printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n",
636 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster);
637 #endif
638
639 switch (vp->v_type) {
640 case VREG:
641 if (ioflag & IO_APPEND)
642 uio->uio_offset = dep->de_FileSize;
643 thisvp = vp;
644 break;
645 case VDIR:
646 return EISDIR;
647 default:
648 panic("msdosfs_write(): bad file type");
649 }
650
651 /*
652 * This is needed (unlike in ffs_write()) because we extend the
653 * file outside of the loop but we don't want to extend the file
654 * for writes of 0 bytes.
655 */
656 if (uio->uio_resid == 0)
657 return (0);
658
659 /*
660 * The caller is supposed to ensure that
661 * uio->uio_offset >= 0 and uio->uio_resid >= 0.
662 */
663 if ((uoff_t)uio->uio_offset + uio->uio_resid > DOS_FILESIZE_MAX)
664 return (EFBIG);
665
666 /*
667 * If they've exceeded their filesize limit, tell them about it.
668 */
669 if (vn_rlimit_fsize(vp, uio, uio->uio_td))
670 return (EFBIG);
671
672 /*
673 * If the offset we are starting the write at is beyond the end of
674 * the file, then they've done a seek. Unix filesystems allow
675 * files with holes in them, DOS doesn't so we must fill the hole
676 * with zeroed blocks.
677 */
678 if (uio->uio_offset > dep->de_FileSize) {
679 error = deextend(dep, uio->uio_offset, cred);
680 if (error)
681 return (error);
682 }
683
684 /*
685 * Remember some values in case the write fails.
686 */
687 resid = uio->uio_resid;
688 osize = dep->de_FileSize;
689
690 /*
691 * If we write beyond the end of the file, extend it to its ultimate
692 * size ahead of the time to hopefully get a contiguous area.
693 */
694 if (uio->uio_offset + resid > osize) {
695 count = de_clcount(pmp, uio->uio_offset + resid) -
696 de_clcount(pmp, osize);
697 error = extendfile(dep, count, NULL, NULL, 0);
698 if (error && (error != ENOSPC || (ioflag & IO_UNIT)))
699 goto errexit;
700 lastcn = dep->de_fc[FC_LASTFC].fc_frcn;
701 } else
702 lastcn = de_clcount(pmp, osize) - 1;
703
704 seqcount = ioflag >> IO_SEQSHIFT;
705 do {
706 if (de_cluster(pmp, uio->uio_offset) > lastcn) {
707 error = ENOSPC;
708 break;
709 }
710
711 croffset = uio->uio_offset & pmp->pm_crbomask;
712 n = min(uio->uio_resid, pmp->pm_bpcluster - croffset);
713 if (uio->uio_offset + n > dep->de_FileSize) {
714 dep->de_FileSize = uio->uio_offset + n;
715 /* The object size needs to be set before buffer is allocated */
716 vnode_pager_setsize(vp, dep->de_FileSize);
717 }
718
719 bn = de_cluster(pmp, uio->uio_offset);
720 if ((uio->uio_offset & pmp->pm_crbomask) == 0
721 && (de_cluster(pmp, uio->uio_offset + uio->uio_resid)
722 > de_cluster(pmp, uio->uio_offset)
723 || uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) {
724 /*
725 * If either the whole cluster gets written,
726 * or we write the cluster from its start beyond EOF,
727 * then no need to read data from disk.
728 */
729 bp = getblk(thisvp, bn, pmp->pm_bpcluster, 0, 0, 0);
730 /*
731 * This call to vfs_bio_clrbuf() ensures that
732 * even if vn_io_fault_uiomove() below faults,
733 * garbage from the newly instantiated buffer
734 * is not exposed to the userspace via mmap().
735 */
736 vfs_bio_clrbuf(bp);
737 /*
738 * Do the bmap now, since pcbmap needs buffers
739 * for the fat table. (see msdosfs_strategy)
740 */
741 if (bp->b_blkno == bp->b_lblkno) {
742 error = pcbmap(dep, bp->b_lblkno, &bn, 0, 0);
743 if (error)
744 bp->b_blkno = -1;
745 else
746 bp->b_blkno = bn;
747 }
748 if (bp->b_blkno == -1) {
749 brelse(bp);
750 if (!error)
751 error = EIO; /* XXX */
752 break;
753 }
754 } else {
755 /*
756 * The block we need to write into exists, so read it in.
757 */
758 error = bread(thisvp, bn, pmp->pm_bpcluster, cred, &bp);
759 if (error) {
760 brelse(bp);
761 break;
762 }
763 }
764
765 /*
766 * Should these vnode_pager_* functions be done on dir
767 * files?
768 */
769
770 /*
771 * Copy the data from user space into the buf header.
772 */
773 error = vn_io_fault_uiomove(bp->b_data + croffset, n, uio);
774 if (error) {
775 brelse(bp);
776 break;
777 }
778
779 /* Prepare for clustered writes in some else clauses. */
780 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0)
781 bp->b_flags |= B_CLUSTEROK;
782
783 /*
784 * If IO_SYNC, then each buffer is written synchronously.
785 * Otherwise, if we have a severe page deficiency then
786 * write the buffer asynchronously. Otherwise, if on a
787 * cluster boundary then write the buffer asynchronously,
788 * combining it with contiguous clusters if permitted and
789 * possible, since we don't expect more writes into this
790 * buffer soon. Otherwise, do a delayed write because we
791 * expect more writes into this buffer soon.
792 */
793 if (ioflag & IO_SYNC)
794 (void)bwrite(bp);
795 else if (vm_page_count_severe() || buf_dirty_count_severe())
796 bawrite(bp);
797 else if (n + croffset == pmp->pm_bpcluster) {
798 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0)
799 cluster_write(vp, bp, dep->de_FileSize,
800 seqcount, 0);
801 else
802 bawrite(bp);
803 } else
804 bdwrite(bp);
805 dep->de_flag |= DE_UPDATE;
806 } while (error == 0 && uio->uio_resid > 0);
807
808 /*
809 * If the write failed and they want us to, truncate the file back
810 * to the size it was before the write was attempted.
811 */
812 errexit:
813 if (error) {
814 if (ioflag & IO_UNIT) {
815 detrunc(dep, osize, ioflag & IO_SYNC, NOCRED);
816 uio->uio_offset -= resid - uio->uio_resid;
817 uio->uio_resid = resid;
818 } else {
819 detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC, NOCRED);
820 if (uio->uio_resid != resid)
821 error = 0;
822 }
823 } else if (ioflag & IO_SYNC)
824 error = deupdat(dep, 1);
825 return (error);
826 }
827
828 /*
829 * Flush the blocks of a file to disk.
830 */
831 static int
832 msdosfs_fsync(struct vop_fsync_args *ap)
833 {
834 struct vnode *devvp;
835 int allerror, error;
836
837 vop_stdfsync(ap);
838
839 /*
840 * If the syncing request comes from fsync(2), sync the entire
841 * FAT and any other metadata that happens to be on devvp. We
842 * need this mainly for the FAT. We write the FAT sloppily, and
843 * syncing it all now is the best we can easily do to get all
844 * directory entries associated with the file (not just the file)
845 * fully synced. The other metadata includes critical metadata
846 * for all directory entries, but only in the MNT_ASYNC case. We
847 * will soon sync all metadata in the file's directory entry.
848 * Non-critical metadata for associated directory entries only
849 * gets synced accidentally, as in most file systems.
850 */
851 if (ap->a_waitfor == MNT_WAIT) {
852 devvp = VTODE(ap->a_vp)->de_pmp->pm_devvp;
853 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
854 allerror = VOP_FSYNC(devvp, MNT_WAIT, ap->a_td);
855 VOP_UNLOCK(devvp, 0);
856 } else
857 allerror = 0;
858
859 error = deupdat(VTODE(ap->a_vp), ap->a_waitfor == MNT_WAIT);
860 if (allerror == 0)
861 allerror = error;
862 return (allerror);
863 }
864
865 static int
866 msdosfs_remove(struct vop_remove_args *ap)
867 {
868 struct denode *dep = VTODE(ap->a_vp);
869 struct denode *ddep = VTODE(ap->a_dvp);
870 int error;
871
872 if (ap->a_vp->v_type == VDIR)
873 error = EPERM;
874 else
875 error = removede(ddep, dep);
876 #ifdef MSDOSFS_DEBUG
877 printf("msdosfs_remove(), dep %p, v_usecount %d\n", dep, ap->a_vp->v_usecount);
878 #endif
879 return (error);
880 }
881
882 /*
883 * DOS filesystems don't know what links are.
884 */
885 static int
886 msdosfs_link(struct vop_link_args *ap)
887 {
888 return (EOPNOTSUPP);
889 }
890
891 /*
892 * Renames on files require moving the denode to a new hash queue since the
893 * denode's location is used to compute which hash queue to put the file
894 * in. Unless it is a rename in place. For example "mv a b".
895 *
896 * What follows is the basic algorithm:
897 *
898 * if (file move) {
899 * if (dest file exists) {
900 * remove dest file
901 * }
902 * if (dest and src in same directory) {
903 * rewrite name in existing directory slot
904 * } else {
905 * write new entry in dest directory
906 * update offset and dirclust in denode
907 * move denode to new hash chain
908 * clear old directory entry
909 * }
910 * } else {
911 * directory move
912 * if (dest directory exists) {
913 * if (dest is not empty) {
914 * return ENOTEMPTY
915 * }
916 * remove dest directory
917 * }
918 * if (dest and src in same directory) {
919 * rewrite name in existing entry
920 * } else {
921 * be sure dest is not a child of src directory
922 * write entry in dest directory
923 * update "." and ".." in moved directory
924 * clear old directory entry for moved directory
925 * }
926 * }
927 *
928 * On entry:
929 * source's parent directory is unlocked
930 * source file or directory is unlocked
931 * destination's parent directory is locked
932 * destination file or directory is locked if it exists
933 *
934 * On exit:
935 * all denodes should be released
936 */
937 static int
938 msdosfs_rename(struct vop_rename_args *ap)
939 {
940 struct vnode *tdvp = ap->a_tdvp;
941 struct vnode *fvp = ap->a_fvp;
942 struct vnode *fdvp = ap->a_fdvp;
943 struct vnode *tvp = ap->a_tvp;
944 struct componentname *tcnp = ap->a_tcnp;
945 struct componentname *fcnp = ap->a_fcnp;
946 struct denode *ip, *xp, *dp, *zp;
947 u_char toname[12], oldname[11];
948 u_long from_diroffset, to_diroffset;
949 u_char to_count;
950 int doingdirectory = 0, newparent = 0;
951 int error;
952 u_long cn, pcl;
953 daddr_t bn;
954 struct msdosfsmount *pmp;
955 struct direntry *dotdotp;
956 struct buf *bp;
957
958 pmp = VFSTOMSDOSFS(fdvp->v_mount);
959
960 #ifdef DIAGNOSTIC
961 if ((tcnp->cn_flags & HASBUF) == 0 ||
962 (fcnp->cn_flags & HASBUF) == 0)
963 panic("msdosfs_rename: no name");
964 #endif
965 /*
966 * Check for cross-device rename.
967 */
968 if (fvp->v_mount != tdvp->v_mount ||
969 (tvp && fvp->v_mount != tvp->v_mount)) {
970 error = EXDEV;
971 abortit:
972 if (tdvp == tvp)
973 vrele(tdvp);
974 else
975 vput(tdvp);
976 if (tvp)
977 vput(tvp);
978 vrele(fdvp);
979 vrele(fvp);
980 return (error);
981 }
982
983 /*
984 * If source and dest are the same, do nothing.
985 */
986 if (tvp == fvp) {
987 error = 0;
988 goto abortit;
989 }
990
991 error = vn_lock(fvp, LK_EXCLUSIVE);
992 if (error)
993 goto abortit;
994 dp = VTODE(fdvp);
995 ip = VTODE(fvp);
996
997 /*
998 * Be sure we are not renaming ".", "..", or an alias of ".". This
999 * leads to a crippled directory tree. It's pretty tough to do a
1000 * "ls" or "pwd" with the "." directory entry missing, and "cd .."
1001 * doesn't work if the ".." entry is missing.
1002 */
1003 if (ip->de_Attributes & ATTR_DIRECTORY) {
1004 /*
1005 * Avoid ".", "..", and aliases of "." for obvious reasons.
1006 */
1007 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
1008 dp == ip ||
1009 (fcnp->cn_flags & ISDOTDOT) ||
1010 (tcnp->cn_flags & ISDOTDOT) ||
1011 (ip->de_flag & DE_RENAME)) {
1012 VOP_UNLOCK(fvp, 0);
1013 error = EINVAL;
1014 goto abortit;
1015 }
1016 ip->de_flag |= DE_RENAME;
1017 doingdirectory++;
1018 }
1019
1020 /*
1021 * When the target exists, both the directory
1022 * and target vnodes are returned locked.
1023 */
1024 dp = VTODE(tdvp);
1025 xp = tvp ? VTODE(tvp) : NULL;
1026 /*
1027 * Remember direntry place to use for destination
1028 */
1029 to_diroffset = dp->de_fndoffset;
1030 to_count = dp->de_fndcnt;
1031
1032 /*
1033 * If ".." must be changed (ie the directory gets a new
1034 * parent) then the source directory must not be in the
1035 * directory hierarchy above the target, as this would
1036 * orphan everything below the source directory. Also
1037 * the user must have write permission in the source so
1038 * as to be able to change "..". We must repeat the call
1039 * to namei, as the parent directory is unlocked by the
1040 * call to doscheckpath().
1041 */
1042 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread);
1043 VOP_UNLOCK(fvp, 0);
1044 if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster)
1045 newparent = 1;
1046 if (doingdirectory && newparent) {
1047 if (error) /* write access check above */
1048 goto bad;
1049 if (xp != NULL)
1050 vput(tvp);
1051 /*
1052 * doscheckpath() vput()'s dp,
1053 * so we have to do a relookup afterwards
1054 */
1055 error = doscheckpath(ip, dp);
1056 if (error)
1057 goto out;
1058 if ((tcnp->cn_flags & SAVESTART) == 0)
1059 panic("msdosfs_rename: lost to startdir");
1060 error = relookup(tdvp, &tvp, tcnp);
1061 if (error)
1062 goto out;
1063 dp = VTODE(tdvp);
1064 xp = tvp ? VTODE(tvp) : NULL;
1065 }
1066
1067 if (xp != NULL) {
1068 /*
1069 * Target must be empty if a directory and have no links
1070 * to it. Also, ensure source and target are compatible
1071 * (both directories, or both not directories).
1072 */
1073 if (xp->de_Attributes & ATTR_DIRECTORY) {
1074 if (!dosdirempty(xp)) {
1075 error = ENOTEMPTY;
1076 goto bad;
1077 }
1078 if (!doingdirectory) {
1079 error = ENOTDIR;
1080 goto bad;
1081 }
1082 cache_purge(tdvp);
1083 } else if (doingdirectory) {
1084 error = EISDIR;
1085 goto bad;
1086 }
1087 error = removede(dp, xp);
1088 if (error)
1089 goto bad;
1090 vput(tvp);
1091 xp = NULL;
1092 }
1093
1094 /*
1095 * Convert the filename in tcnp into a dos filename. We copy this
1096 * into the denode and directory entry for the destination
1097 * file/directory.
1098 */
1099 error = uniqdosname(VTODE(tdvp), tcnp, toname);
1100 if (error)
1101 goto abortit;
1102
1103 /*
1104 * Since from wasn't locked at various places above,
1105 * have to do a relookup here.
1106 */
1107 fcnp->cn_flags &= ~MODMASK;
1108 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
1109 if ((fcnp->cn_flags & SAVESTART) == 0)
1110 panic("msdosfs_rename: lost from startdir");
1111 if (!newparent)
1112 VOP_UNLOCK(tdvp, 0);
1113 if (relookup(fdvp, &fvp, fcnp) == 0)
1114 vrele(fdvp);
1115 if (fvp == NULL) {
1116 /*
1117 * From name has disappeared.
1118 */
1119 if (doingdirectory)
1120 panic("rename: lost dir entry");
1121 if (newparent)
1122 VOP_UNLOCK(tdvp, 0);
1123 vrele(tdvp);
1124 vrele(ap->a_fvp);
1125 return 0;
1126 }
1127 xp = VTODE(fvp);
1128 zp = VTODE(fdvp);
1129 from_diroffset = zp->de_fndoffset;
1130
1131 /*
1132 * Ensure that the directory entry still exists and has not
1133 * changed till now. If the source is a file the entry may
1134 * have been unlinked or renamed. In either case there is
1135 * no further work to be done. If the source is a directory
1136 * then it cannot have been rmdir'ed or renamed; this is
1137 * prohibited by the DE_RENAME flag.
1138 */
1139 if (xp != ip) {
1140 if (doingdirectory)
1141 panic("rename: lost dir entry");
1142 VOP_UNLOCK(fvp, 0);
1143 if (newparent)
1144 VOP_UNLOCK(fdvp, 0);
1145 vrele(ap->a_fvp);
1146 xp = NULL;
1147 } else {
1148 vrele(fvp);
1149 xp = NULL;
1150
1151 /*
1152 * First write a new entry in the destination
1153 * directory and mark the entry in the source directory
1154 * as deleted. Then move the denode to the correct hash
1155 * chain for its new location in the filesystem. And, if
1156 * we moved a directory, then update its .. entry to point
1157 * to the new parent directory.
1158 */
1159 bcopy(ip->de_Name, oldname, 11);
1160 bcopy(toname, ip->de_Name, 11); /* update denode */
1161 dp->de_fndoffset = to_diroffset;
1162 dp->de_fndcnt = to_count;
1163 error = createde(ip, dp, (struct denode **)0, tcnp);
1164 if (error) {
1165 bcopy(oldname, ip->de_Name, 11);
1166 if (newparent)
1167 VOP_UNLOCK(fdvp, 0);
1168 VOP_UNLOCK(fvp, 0);
1169 goto bad;
1170 }
1171 /*
1172 * If ip is for a directory, then its name should always
1173 * be "." since it is for the directory entry in the
1174 * directory itself (msdosfs_lookup() always translates
1175 * to the "." entry so as to get a unique denode, except
1176 * for the root directory there are different
1177 * complications). However, we just corrupted its name
1178 * to pass the correct name to createde(). Undo this.
1179 */
1180 if ((ip->de_Attributes & ATTR_DIRECTORY) != 0)
1181 bcopy(oldname, ip->de_Name, 11);
1182 ip->de_refcnt++;
1183 zp->de_fndoffset = from_diroffset;
1184 error = removede(zp, ip);
1185 if (error) {
1186 /* XXX should downgrade to ro here, fs is corrupt */
1187 if (newparent)
1188 VOP_UNLOCK(fdvp, 0);
1189 VOP_UNLOCK(fvp, 0);
1190 goto bad;
1191 }
1192 if (!doingdirectory) {
1193 error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0,
1194 &ip->de_dirclust, 0);
1195 if (error) {
1196 /* XXX should downgrade to ro here, fs is corrupt */
1197 if (newparent)
1198 VOP_UNLOCK(fdvp, 0);
1199 VOP_UNLOCK(fvp, 0);
1200 goto bad;
1201 }
1202 if (ip->de_dirclust == MSDOSFSROOT)
1203 ip->de_diroffset = to_diroffset;
1204 else
1205 ip->de_diroffset = to_diroffset & pmp->pm_crbomask;
1206 }
1207 reinsert(ip);
1208 if (newparent)
1209 VOP_UNLOCK(fdvp, 0);
1210 }
1211
1212 /*
1213 * If we moved a directory to a new parent directory, then we must
1214 * fixup the ".." entry in the moved directory.
1215 */
1216 if (doingdirectory && newparent) {
1217 cn = ip->de_StartCluster;
1218 if (cn == MSDOSFSROOT) {
1219 /* this should never happen */
1220 panic("msdosfs_rename(): updating .. in root directory?");
1221 } else
1222 bn = cntobn(pmp, cn);
1223 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster,
1224 NOCRED, &bp);
1225 if (error) {
1226 /* XXX should downgrade to ro here, fs is corrupt */
1227 brelse(bp);
1228 VOP_UNLOCK(fvp, 0);
1229 goto bad;
1230 }
1231 dotdotp = (struct direntry *)bp->b_data + 1;
1232 pcl = dp->de_StartCluster;
1233 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk)
1234 pcl = MSDOSFSROOT;
1235 putushort(dotdotp->deStartCluster, pcl);
1236 if (FAT32(pmp))
1237 putushort(dotdotp->deHighClust, pcl >> 16);
1238 if (DOINGASYNC(fvp))
1239 bdwrite(bp);
1240 else if ((error = bwrite(bp)) != 0) {
1241 /* XXX should downgrade to ro here, fs is corrupt */
1242 VOP_UNLOCK(fvp, 0);
1243 goto bad;
1244 }
1245 }
1246
1247 /*
1248 * The msdosfs lookup is case insensitive. Several aliases may
1249 * be inserted for a single directory entry. As a consequnce,
1250 * name cache purge done by lookup for fvp when DELETE op for
1251 * namei is specified, might be not enough to expunge all
1252 * namecache entries that were installed for this direntry.
1253 */
1254 cache_purge(fvp);
1255 VOP_UNLOCK(fvp, 0);
1256 bad:
1257 if (xp)
1258 vput(tvp);
1259 vput(tdvp);
1260 out:
1261 ip->de_flag &= ~DE_RENAME;
1262 vrele(fdvp);
1263 vrele(fvp);
1264 return (error);
1265
1266 }
1267
1268 static struct {
1269 struct direntry dot;
1270 struct direntry dotdot;
1271 } dosdirtemplate = {
1272 { ". ", /* the . entry */
1273 ATTR_DIRECTORY, /* file attribute */
1274 0, /* reserved */
1275 0, { 0, 0 }, { 0, 0 }, /* create time & date */
1276 { 0, 0 }, /* access date */
1277 { 0, 0 }, /* high bits of start cluster */
1278 { 210, 4 }, { 210, 4 }, /* modify time & date */
1279 { 0, 0 }, /* startcluster */
1280 { 0, 0, 0, 0 } /* filesize */
1281 },
1282 { ".. ", /* the .. entry */
1283 ATTR_DIRECTORY, /* file attribute */
1284 0, /* reserved */
1285 0, { 0, 0 }, { 0, 0 }, /* create time & date */
1286 { 0, 0 }, /* access date */
1287 { 0, 0 }, /* high bits of start cluster */
1288 { 210, 4 }, { 210, 4 }, /* modify time & date */
1289 { 0, 0 }, /* startcluster */
1290 { 0, 0, 0, 0 } /* filesize */
1291 }
1292 };
1293
1294 static int
1295 msdosfs_mkdir(struct vop_mkdir_args *ap)
1296 {
1297 struct componentname *cnp = ap->a_cnp;
1298 struct denode *dep;
1299 struct denode *pdep = VTODE(ap->a_dvp);
1300 struct direntry *denp;
1301 struct msdosfsmount *pmp = pdep->de_pmp;
1302 struct buf *bp;
1303 u_long newcluster, pcl;
1304 int bn;
1305 int error;
1306 struct denode ndirent;
1307 struct timespec ts;
1308
1309 /*
1310 * If this is the root directory and there is no space left we
1311 * can't do anything. This is because the root directory can not
1312 * change size.
1313 */
1314 if (pdep->de_StartCluster == MSDOSFSROOT
1315 && pdep->de_fndoffset >= pdep->de_FileSize) {
1316 error = ENOSPC;
1317 goto bad2;
1318 }
1319
1320 /*
1321 * Allocate a cluster to hold the about to be created directory.
1322 */
1323 error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL);
1324 if (error)
1325 goto bad2;
1326
1327 bzero(&ndirent, sizeof(ndirent));
1328 ndirent.de_pmp = pmp;
1329 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE;
1330 vfs_timestamp(&ts);
1331 DETIMES(&ndirent, &ts, &ts, &ts);
1332
1333 /*
1334 * Now fill the cluster with the "." and ".." entries. And write
1335 * the cluster to disk. This way it is there for the parent
1336 * directory to be pointing at if there were a crash.
1337 */
1338 bn = cntobn(pmp, newcluster);
1339 /* always succeeds */
1340 bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0, 0);
1341 bzero(bp->b_data, pmp->pm_bpcluster);
1342 bcopy(&dosdirtemplate, bp->b_data, sizeof dosdirtemplate);
1343 denp = (struct direntry *)bp->b_data;
1344 putushort(denp[0].deStartCluster, newcluster);
1345 putushort(denp[0].deCDate, ndirent.de_CDate);
1346 putushort(denp[0].deCTime, ndirent.de_CTime);
1347 denp[0].deCHundredth = ndirent.de_CHun;
1348 putushort(denp[0].deADate, ndirent.de_ADate);
1349 putushort(denp[0].deMDate, ndirent.de_MDate);
1350 putushort(denp[0].deMTime, ndirent.de_MTime);
1351 pcl = pdep->de_StartCluster;
1352 /*
1353 * Although the root directory has a non-magic starting cluster
1354 * number for FAT32, chkdsk and fsck_msdosfs still require
1355 * references to it in dotdot entries to be magic.
1356 */
1357 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk)
1358 pcl = MSDOSFSROOT;
1359 putushort(denp[1].deStartCluster, pcl);
1360 putushort(denp[1].deCDate, ndirent.de_CDate);
1361 putushort(denp[1].deCTime, ndirent.de_CTime);
1362 denp[1].deCHundredth = ndirent.de_CHun;
1363 putushort(denp[1].deADate, ndirent.de_ADate);
1364 putushort(denp[1].deMDate, ndirent.de_MDate);
1365 putushort(denp[1].deMTime, ndirent.de_MTime);
1366 if (FAT32(pmp)) {
1367 putushort(denp[0].deHighClust, newcluster >> 16);
1368 putushort(denp[1].deHighClust, pcl >> 16);
1369 }
1370
1371 if (DOINGASYNC(ap->a_dvp))
1372 bdwrite(bp);
1373 else if ((error = bwrite(bp)) != 0)
1374 goto bad;
1375
1376 /*
1377 * Now build up a directory entry pointing to the newly allocated
1378 * cluster. This will be written to an empty slot in the parent
1379 * directory.
1380 */
1381 #ifdef DIAGNOSTIC
1382 if ((cnp->cn_flags & HASBUF) == 0)
1383 panic("msdosfs_mkdir: no name");
1384 #endif
1385 error = uniqdosname(pdep, cnp, ndirent.de_Name);
1386 if (error)
1387 goto bad;
1388
1389 ndirent.de_Attributes = ATTR_DIRECTORY;
1390 ndirent.de_LowerCase = 0;
1391 ndirent.de_StartCluster = newcluster;
1392 ndirent.de_FileSize = 0;
1393 error = createde(&ndirent, pdep, &dep, cnp);
1394 if (error)
1395 goto bad;
1396 *ap->a_vpp = DETOV(dep);
1397 return (0);
1398
1399 bad:
1400 clusterfree(pmp, newcluster, NULL);
1401 bad2:
1402 return (error);
1403 }
1404
1405 static int
1406 msdosfs_rmdir(struct vop_rmdir_args *ap)
1407 {
1408 struct vnode *vp = ap->a_vp;
1409 struct vnode *dvp = ap->a_dvp;
1410 struct componentname *cnp = ap->a_cnp;
1411 struct denode *ip, *dp;
1412 int error;
1413
1414 ip = VTODE(vp);
1415 dp = VTODE(dvp);
1416
1417 /*
1418 * Verify the directory is empty (and valid).
1419 * (Rmdir ".." won't be valid since
1420 * ".." will contain a reference to
1421 * the current directory and thus be
1422 * non-empty.)
1423 */
1424 error = 0;
1425 if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) {
1426 error = ENOTEMPTY;
1427 goto out;
1428 }
1429 /*
1430 * Delete the entry from the directory. For dos filesystems this
1431 * gets rid of the directory entry on disk, the in memory copy
1432 * still exists but the de_refcnt is <= 0. This prevents it from
1433 * being found by deget(). When the vput() on dep is done we give
1434 * up access and eventually msdosfs_reclaim() will be called which
1435 * will remove it from the denode cache.
1436 */
1437 error = removede(dp, ip);
1438 if (error)
1439 goto out;
1440 /*
1441 * This is where we decrement the link count in the parent
1442 * directory. Since dos filesystems don't do this we just purge
1443 * the name cache.
1444 */
1445 cache_purge(dvp);
1446 /*
1447 * Truncate the directory that is being deleted.
1448 */
1449 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred);
1450 cache_purge(vp);
1451
1452 out:
1453 return (error);
1454 }
1455
1456 /*
1457 * DOS filesystems don't know what symlinks are.
1458 */
1459 static int
1460 msdosfs_symlink(struct vop_symlink_args *ap)
1461 {
1462 return (EOPNOTSUPP);
1463 }
1464
1465 static int
1466 msdosfs_readdir(struct vop_readdir_args *ap)
1467 {
1468 struct mbnambuf nb;
1469 int error = 0;
1470 int diff;
1471 long n;
1472 int blsize;
1473 long on;
1474 u_long cn;
1475 uint64_t fileno;
1476 u_long dirsperblk;
1477 long bias = 0;
1478 daddr_t bn, lbn;
1479 struct buf *bp;
1480 struct denode *dep = VTODE(ap->a_vp);
1481 struct msdosfsmount *pmp = dep->de_pmp;
1482 struct direntry *dentp;
1483 struct dirent dirbuf;
1484 struct uio *uio = ap->a_uio;
1485 u_long *cookies = NULL;
1486 int ncookies = 0;
1487 off_t offset, off;
1488 int chksum = -1;
1489
1490 #ifdef MSDOSFS_DEBUG
1491 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n",
1492 ap->a_vp, uio, ap->a_cred, ap->a_eofflag);
1493 #endif
1494
1495 /*
1496 * msdosfs_readdir() won't operate properly on regular files since
1497 * it does i/o only with the filesystem vnode, and hence can
1498 * retrieve the wrong block from the buffer cache for a plain file.
1499 * So, fail attempts to readdir() on a plain file.
1500 */
1501 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0)
1502 return (ENOTDIR);
1503
1504 /*
1505 * To be safe, initialize dirbuf
1506 */
1507 bzero(dirbuf.d_name, sizeof(dirbuf.d_name));
1508
1509 /*
1510 * If the user buffer is smaller than the size of one dos directory
1511 * entry or the file offset is not a multiple of the size of a
1512 * directory entry, then we fail the read.
1513 */
1514 off = offset = uio->uio_offset;
1515 if (uio->uio_resid < sizeof(struct direntry) ||
1516 (offset & (sizeof(struct direntry) - 1)))
1517 return (EINVAL);
1518
1519 if (ap->a_ncookies) {
1520 ncookies = uio->uio_resid / 16;
1521 cookies = malloc(ncookies * sizeof(u_long), M_TEMP,
1522 M_WAITOK);
1523 *ap->a_cookies = cookies;
1524 *ap->a_ncookies = ncookies;
1525 }
1526
1527 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry);
1528
1529 /*
1530 * If they are reading from the root directory then, we simulate
1531 * the . and .. entries since these don't exist in the root
1532 * directory. We also set the offset bias to make up for having to
1533 * simulate these entries. By this I mean that at file offset 64 we
1534 * read the first entry in the root directory that lives on disk.
1535 */
1536 if (dep->de_StartCluster == MSDOSFSROOT
1537 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) {
1538 #if 0
1539 printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n",
1540 offset);
1541 #endif
1542 bias = 2 * sizeof(struct direntry);
1543 if (offset < bias) {
1544 for (n = (int)offset / sizeof(struct direntry);
1545 n < 2; n++) {
1546 if (FAT32(pmp))
1547 fileno = (uint64_t)cntobn(pmp,
1548 pmp->pm_rootdirblk)
1549 * dirsperblk;
1550 else
1551 fileno = 1;
1552 if (pmp->pm_flags & MSDOSFS_LARGEFS) {
1553 dirbuf.d_fileno =
1554 msdosfs_fileno_map(pmp->pm_mountp,
1555 fileno);
1556 } else {
1557
1558 dirbuf.d_fileno = (uint32_t)fileno;
1559 }
1560 dirbuf.d_type = DT_DIR;
1561 switch (n) {
1562 case 0:
1563 dirbuf.d_namlen = 1;
1564 dirbuf.d_name[0] = '.';
1565 break;
1566 case 1:
1567 dirbuf.d_namlen = 2;
1568 dirbuf.d_name[0] = '.';
1569 dirbuf.d_name[1] = '.';
1570 break;
1571 }
1572 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf);
1573 dirent_terminate(&dirbuf);
1574 if (uio->uio_resid < dirbuf.d_reclen)
1575 goto out;
1576 error = uiomove(&dirbuf, dirbuf.d_reclen, uio);
1577 if (error)
1578 goto out;
1579 offset += sizeof(struct direntry);
1580 off = offset;
1581 if (cookies) {
1582 *cookies++ = offset;
1583 if (--ncookies <= 0)
1584 goto out;
1585 }
1586 }
1587 }
1588 }
1589
1590 mbnambuf_init(&nb);
1591 off = offset;
1592 while (uio->uio_resid > 0) {
1593 lbn = de_cluster(pmp, offset - bias);
1594 on = (offset - bias) & pmp->pm_crbomask;
1595 n = min(pmp->pm_bpcluster - on, uio->uio_resid);
1596 diff = dep->de_FileSize - (offset - bias);
1597 if (diff <= 0)
1598 break;
1599 n = min(n, diff);
1600 error = pcbmap(dep, lbn, &bn, &cn, &blsize);
1601 if (error)
1602 break;
1603 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp);
1604 if (error) {
1605 brelse(bp);
1606 return (error);
1607 }
1608 n = min(n, blsize - bp->b_resid);
1609 if (n == 0) {
1610 brelse(bp);
1611 return (EIO);
1612 }
1613
1614 /*
1615 * Convert from dos directory entries to fs-independent
1616 * directory entries.
1617 */
1618 for (dentp = (struct direntry *)(bp->b_data + on);
1619 (char *)dentp < bp->b_data + on + n;
1620 dentp++, offset += sizeof(struct direntry)) {
1621 #if 0
1622 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n",
1623 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes);
1624 #endif
1625 /*
1626 * If this is an unused entry, we can stop.
1627 */
1628 if (dentp->deName[0] == SLOT_EMPTY) {
1629 brelse(bp);
1630 goto out;
1631 }
1632 /*
1633 * Skip deleted entries.
1634 */
1635 if (dentp->deName[0] == SLOT_DELETED) {
1636 chksum = -1;
1637 mbnambuf_init(&nb);
1638 continue;
1639 }
1640
1641 /*
1642 * Handle Win95 long directory entries
1643 */
1644 if (dentp->deAttributes == ATTR_WIN95) {
1645 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME)
1646 continue;
1647 chksum = win2unixfn(&nb,
1648 (struct winentry *)dentp, chksum, pmp);
1649 continue;
1650 }
1651
1652 /*
1653 * Skip volume labels
1654 */
1655 if (dentp->deAttributes & ATTR_VOLUME) {
1656 chksum = -1;
1657 mbnambuf_init(&nb);
1658 continue;
1659 }
1660 /*
1661 * This computation of d_fileno must match
1662 * the computation of va_fileid in
1663 * msdosfs_getattr.
1664 */
1665 if (dentp->deAttributes & ATTR_DIRECTORY) {
1666 fileno = getushort(dentp->deStartCluster);
1667 if (FAT32(pmp))
1668 fileno |= getushort(dentp->deHighClust) << 16;
1669 /* if this is the root directory */
1670 if (fileno == MSDOSFSROOT)
1671 if (FAT32(pmp))
1672 fileno = (uint64_t)cntobn(pmp,
1673 pmp->pm_rootdirblk)
1674 * dirsperblk;
1675 else
1676 fileno = 1;
1677 else
1678 fileno = (uint64_t)cntobn(pmp, fileno) *
1679 dirsperblk;
1680 dirbuf.d_type = DT_DIR;
1681 } else {
1682 fileno = (uoff_t)offset /
1683 sizeof(struct direntry);
1684 dirbuf.d_type = DT_REG;
1685 }
1686 if (pmp->pm_flags & MSDOSFS_LARGEFS) {
1687 dirbuf.d_fileno =
1688 msdosfs_fileno_map(pmp->pm_mountp, fileno);
1689 } else
1690 dirbuf.d_fileno = (uint32_t)fileno;
1691
1692 if (chksum != winChksum(dentp->deName)) {
1693 dirbuf.d_namlen = dos2unixfn(dentp->deName,
1694 (u_char *)dirbuf.d_name,
1695 dentp->deLowerCase |
1696 ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ?
1697 (LCASE_BASE | LCASE_EXT) : 0),
1698 pmp);
1699 mbnambuf_init(&nb);
1700 } else
1701 mbnambuf_flush(&nb, &dirbuf);
1702 chksum = -1;
1703 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf);
1704 dirent_terminate(&dirbuf);
1705 if (uio->uio_resid < dirbuf.d_reclen) {
1706 brelse(bp);
1707 goto out;
1708 }
1709 error = uiomove(&dirbuf, dirbuf.d_reclen, uio);
1710 if (error) {
1711 brelse(bp);
1712 goto out;
1713 }
1714 if (cookies) {
1715 *cookies++ = offset + sizeof(struct direntry);
1716 if (--ncookies <= 0) {
1717 brelse(bp);
1718 goto out;
1719 }
1720 }
1721 off = offset + sizeof(struct direntry);
1722 }
1723 brelse(bp);
1724 }
1725 out:
1726 /* Subtract unused cookies */
1727 if (ap->a_ncookies)
1728 *ap->a_ncookies -= ncookies;
1729
1730 uio->uio_offset = off;
1731
1732 /*
1733 * Set the eofflag (NFS uses it)
1734 */
1735 if (ap->a_eofflag) {
1736 if (dep->de_FileSize - (offset - bias) <= 0)
1737 *ap->a_eofflag = 1;
1738 else
1739 *ap->a_eofflag = 0;
1740 }
1741 return (error);
1742 }
1743
1744 /*-
1745 * a_vp - pointer to the file's vnode
1746 * a_bn - logical block number within the file (cluster number for us)
1747 * a_bop - where to return the bufobj of the special file containing the fs
1748 * a_bnp - where to return the "physical" block number corresponding to a_bn
1749 * (relative to the special file; units are blocks of size DEV_BSIZE)
1750 * a_runp - where to return the "run past" a_bn. This is the count of logical
1751 * blocks whose physical blocks (together with a_bn's physical block)
1752 * are contiguous.
1753 * a_runb - where to return the "run before" a_bn.
1754 */
1755 static int
1756 msdosfs_bmap(struct vop_bmap_args *ap)
1757 {
1758 struct denode *dep;
1759 struct mount *mp;
1760 struct msdosfsmount *pmp;
1761 struct vnode *vp;
1762 daddr_t runbn;
1763 u_long cn;
1764 int bnpercn, error, maxio, maxrun, run;
1765
1766 vp = ap->a_vp;
1767 dep = VTODE(vp);
1768 pmp = dep->de_pmp;
1769 if (ap->a_bop != NULL)
1770 *ap->a_bop = &pmp->pm_devvp->v_bufobj;
1771 if (ap->a_bnp == NULL)
1772 return (0);
1773 if (ap->a_runp != NULL)
1774 *ap->a_runp = 0;
1775 if (ap->a_runb != NULL)
1776 *ap->a_runb = 0;
1777 cn = ap->a_bn;
1778 if (cn != ap->a_bn)
1779 return (EFBIG);
1780 error = pcbmap(dep, cn, ap->a_bnp, NULL, NULL);
1781 if (error != 0 || (ap->a_runp == NULL && ap->a_runb == NULL))
1782 return (error);
1783
1784 mp = vp->v_mount;
1785 maxio = mp->mnt_iosize_max / mp->mnt_stat.f_iosize;
1786 bnpercn = de_cn2bn(pmp, 1);
1787 if (ap->a_runp != NULL) {
1788 maxrun = ulmin(maxio - 1, pmp->pm_maxcluster - cn);
1789 for (run = 1; run <= maxrun; run++) {
1790 if (pcbmap(dep, cn + run, &runbn, NULL, NULL) != 0 ||
1791 runbn != *ap->a_bnp + run * bnpercn)
1792 break;
1793 }
1794 *ap->a_runp = run - 1;
1795 }
1796 if (ap->a_runb != NULL) {
1797 maxrun = ulmin(maxio - 1, cn);
1798 for (run = 1; run < maxrun; run++) {
1799 if (pcbmap(dep, cn - run, &runbn, NULL, NULL) != 0 ||
1800 runbn != *ap->a_bnp - run * bnpercn)
1801 break;
1802 }
1803 *ap->a_runb = run - 1;
1804 }
1805 return (0);
1806 }
1807
1808 SYSCTL_NODE(_vfs, OID_AUTO, msdosfs, CTLFLAG_RW, 0, "msdos filesystem");
1809 static int use_buf_pager = 0;
1810 SYSCTL_INT(_vfs_msdosfs, OID_AUTO, use_buf_pager, CTLFLAG_RWTUN,
1811 &use_buf_pager, 0,
1812 "Use buffer pager instead of bmap");
1813
1814 static daddr_t
1815 msdosfs_gbp_getblkno(struct vnode *vp, vm_ooffset_t off)
1816 {
1817
1818 return (de_cluster(VTODE(vp)->de_pmp, off));
1819 }
1820
1821 static int
1822 msdosfs_gbp_getblksz(struct vnode *vp, daddr_t lbn)
1823 {
1824
1825 return (VTODE(vp)->de_pmp->pm_bpcluster);
1826 }
1827
1828 static int
1829 msdosfs_getpages(struct vop_getpages_args *ap)
1830 {
1831
1832 if (use_buf_pager)
1833 return (vfs_bio_getpages(ap->a_vp, ap->a_m, ap->a_count,
1834 ap->a_rbehind, ap->a_rahead, msdosfs_gbp_getblkno,
1835 msdosfs_gbp_getblksz));
1836 return (vnode_pager_generic_getpages(ap->a_vp, ap->a_m, ap->a_count,
1837 ap->a_rbehind, ap->a_rahead, NULL, NULL));
1838 }
1839
1840 static int
1841 msdosfs_strategy(struct vop_strategy_args *ap)
1842 {
1843 struct buf *bp = ap->a_bp;
1844 struct denode *dep = VTODE(ap->a_vp);
1845 struct bufobj *bo;
1846 int error = 0;
1847 daddr_t blkno;
1848
1849 /*
1850 * If we don't already know the filesystem relative block number
1851 * then get it using pcbmap(). If pcbmap() returns the block
1852 * number as -1 then we've got a hole in the file. DOS filesystems
1853 * don't allow files with holes, so we shouldn't ever see this.
1854 */
1855 if (bp->b_blkno == bp->b_lblkno) {
1856 error = pcbmap(dep, bp->b_lblkno, &blkno, 0, 0);
1857 bp->b_blkno = blkno;
1858 if (error) {
1859 bp->b_error = error;
1860 bp->b_ioflags |= BIO_ERROR;
1861 bufdone(bp);
1862 return (0);
1863 }
1864 if ((long)bp->b_blkno == -1)
1865 vfs_bio_clrbuf(bp);
1866 }
1867 if (bp->b_blkno == -1) {
1868 bufdone(bp);
1869 return (0);
1870 }
1871 /*
1872 * Read/write the block from/to the disk that contains the desired
1873 * file block.
1874 */
1875 bp->b_iooffset = dbtob(bp->b_blkno);
1876 bo = dep->de_pmp->pm_bo;
1877 BO_STRATEGY(bo, bp);
1878 return (0);
1879 }
1880
1881 static int
1882 msdosfs_print(struct vop_print_args *ap)
1883 {
1884 struct denode *dep = VTODE(ap->a_vp);
1885
1886 printf("\tstartcluster %lu, dircluster %lu, diroffset %lu, ",
1887 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset);
1888 printf("on dev %s\n", devtoname(dep->de_pmp->pm_dev));
1889 return (0);
1890 }
1891
1892 static int
1893 msdosfs_pathconf(struct vop_pathconf_args *ap)
1894 {
1895 struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp;
1896
1897 switch (ap->a_name) {
1898 case _PC_FILESIZEBITS:
1899 *ap->a_retval = 32;
1900 return (0);
1901 case _PC_LINK_MAX:
1902 *ap->a_retval = 1;
1903 return (0);
1904 case _PC_NAME_MAX:
1905 *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12;
1906 return (0);
1907 case _PC_CHOWN_RESTRICTED:
1908 *ap->a_retval = 1;
1909 return (0);
1910 case _PC_NO_TRUNC:
1911 *ap->a_retval = 0;
1912 return (0);
1913 default:
1914 return (vop_stdpathconf(ap));
1915 }
1916 /* NOTREACHED */
1917 }
1918
1919 static int
1920 msdosfs_vptofh(struct vop_vptofh_args *ap)
1921 {
1922 struct denode *dep;
1923 struct defid *defhp;
1924
1925 dep = VTODE(ap->a_vp);
1926 defhp = (struct defid *)ap->a_fhp;
1927 defhp->defid_len = sizeof(struct defid);
1928 defhp->defid_dirclust = dep->de_dirclust;
1929 defhp->defid_dirofs = dep->de_diroffset;
1930 /* defhp->defid_gen = dep->de_gen; */
1931 return (0);
1932 }
1933
1934 /* Global vfs data structures for msdosfs */
1935 struct vop_vector msdosfs_vnodeops = {
1936 .vop_default = &default_vnodeops,
1937
1938 .vop_access = msdosfs_access,
1939 .vop_bmap = msdosfs_bmap,
1940 .vop_getpages = msdosfs_getpages,
1941 .vop_cachedlookup = msdosfs_lookup,
1942 .vop_open = msdosfs_open,
1943 .vop_close = msdosfs_close,
1944 .vop_create = msdosfs_create,
1945 .vop_fsync = msdosfs_fsync,
1946 .vop_fdatasync = vop_stdfdatasync_buf,
1947 .vop_getattr = msdosfs_getattr,
1948 .vop_inactive = msdosfs_inactive,
1949 .vop_link = msdosfs_link,
1950 .vop_lookup = vfs_cache_lookup,
1951 .vop_mkdir = msdosfs_mkdir,
1952 .vop_mknod = msdosfs_mknod,
1953 .vop_pathconf = msdosfs_pathconf,
1954 .vop_print = msdosfs_print,
1955 .vop_read = msdosfs_read,
1956 .vop_readdir = msdosfs_readdir,
1957 .vop_reclaim = msdosfs_reclaim,
1958 .vop_remove = msdosfs_remove,
1959 .vop_rename = msdosfs_rename,
1960 .vop_rmdir = msdosfs_rmdir,
1961 .vop_setattr = msdosfs_setattr,
1962 .vop_strategy = msdosfs_strategy,
1963 .vop_symlink = msdosfs_symlink,
1964 .vop_write = msdosfs_write,
1965 .vop_vptofh = msdosfs_vptofh,
1966 };
Cache object: ecee0af5f585525ab0310065cf9dea04
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