1 /* $FreeBSD: releng/8.4/sys/fs/msdosfs/msdosfs_vnops.c 246548 2013-02-08 11:15:57Z kib $ */
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/unistd.h>
66 #include <sys/vnode.h>
67
68 #include <vm/vm.h>
69 #include <vm/vm_extern.h>
70
71 #include <fs/msdosfs/bpb.h>
72 #include <fs/msdosfs/direntry.h>
73 #include <fs/msdosfs/denode.h>
74 #include <fs/msdosfs/fat.h>
75 #include <fs/msdosfs/msdosfsmount.h>
76
77 #define DOS_FILESIZE_MAX 0xffffffff
78
79 /*
80 * Prototypes for MSDOSFS vnode operations
81 */
82 static vop_create_t msdosfs_create;
83 static vop_mknod_t msdosfs_mknod;
84 static vop_open_t msdosfs_open;
85 static vop_close_t msdosfs_close;
86 static vop_access_t msdosfs_access;
87 static vop_getattr_t msdosfs_getattr;
88 static vop_setattr_t msdosfs_setattr;
89 static vop_read_t msdosfs_read;
90 static vop_write_t msdosfs_write;
91 static vop_fsync_t msdosfs_fsync;
92 static vop_remove_t msdosfs_remove;
93 static vop_link_t msdosfs_link;
94 static vop_rename_t msdosfs_rename;
95 static vop_mkdir_t msdosfs_mkdir;
96 static vop_rmdir_t msdosfs_rmdir;
97 static vop_symlink_t msdosfs_symlink;
98 static vop_readdir_t msdosfs_readdir;
99 static vop_bmap_t msdosfs_bmap;
100 static vop_strategy_t msdosfs_strategy;
101 static vop_print_t msdosfs_print;
102 static vop_pathconf_t msdosfs_pathconf;
103 static vop_vptofh_t msdosfs_vptofh;
104
105 /*
106 * Some general notes:
107 *
108 * In the ufs filesystem the inodes, superblocks, and indirect blocks are
109 * read/written using the vnode for the filesystem. Blocks that represent
110 * the contents of a file are read/written using the vnode for the file
111 * (including directories when they are read/written as files). This
112 * presents problems for the dos filesystem because data that should be in
113 * an inode (if dos had them) resides in the directory itself. Since we
114 * must update directory entries without the benefit of having the vnode
115 * for the directory we must use the vnode for the filesystem. This means
116 * that when a directory is actually read/written (via read, write, or
117 * readdir, or seek) we must use the vnode for the filesystem instead of
118 * the vnode for the directory as would happen in ufs. This is to insure we
119 * retreive the correct block from the buffer cache since the hash value is
120 * based upon the vnode address and the desired block number.
121 */
122
123 /*
124 * Create a regular file. On entry the directory to contain the file being
125 * created is locked. We must release before we return. We must also free
126 * the pathname buffer pointed at by cnp->cn_pnbuf, always on error, or
127 * only if the SAVESTART bit in cn_flags is clear on success.
128 */
129 static int
130 msdosfs_create(ap)
131 struct vop_create_args /* {
132 struct vnode *a_dvp;
133 struct vnode **a_vpp;
134 struct componentname *a_cnp;
135 struct vattr *a_vap;
136 } */ *ap;
137 {
138 struct componentname *cnp = ap->a_cnp;
139 struct denode ndirent;
140 struct denode *dep;
141 struct denode *pdep = VTODE(ap->a_dvp);
142 struct timespec ts;
143 int error;
144
145 #ifdef MSDOSFS_DEBUG
146 printf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap);
147 #endif
148
149 /*
150 * If this is the root directory and there is no space left we
151 * can't do anything. This is because the root directory can not
152 * change size.
153 */
154 if (pdep->de_StartCluster == MSDOSFSROOT
155 && pdep->de_fndoffset >= pdep->de_FileSize) {
156 error = ENOSPC;
157 goto bad;
158 }
159
160 /*
161 * Create a directory entry for the file, then call createde() to
162 * have it installed. NOTE: DOS files are always executable. We
163 * use the absence of the owner write bit to make the file
164 * readonly.
165 */
166 #ifdef DIAGNOSTIC
167 if ((cnp->cn_flags & HASBUF) == 0)
168 panic("msdosfs_create: no name");
169 #endif
170 bzero(&ndirent, sizeof(ndirent));
171 error = uniqdosname(pdep, cnp, ndirent.de_Name);
172 if (error)
173 goto bad;
174
175 ndirent.de_Attributes = (ap->a_vap->va_mode & VWRITE) ?
176 ATTR_ARCHIVE : ATTR_ARCHIVE | ATTR_READONLY;
177 ndirent.de_LowerCase = 0;
178 ndirent.de_StartCluster = 0;
179 ndirent.de_FileSize = 0;
180 ndirent.de_pmp = pdep->de_pmp;
181 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE;
182 getnanotime(&ts);
183 DETIMES(&ndirent, &ts, &ts, &ts);
184 error = createde(&ndirent, pdep, &dep, cnp);
185 if (error)
186 goto bad;
187 *ap->a_vpp = DETOV(dep);
188 return (0);
189
190 bad:
191 return (error);
192 }
193
194 static int
195 msdosfs_mknod(ap)
196 struct vop_mknod_args /* {
197 struct vnode *a_dvp;
198 struct vnode **a_vpp;
199 struct componentname *a_cnp;
200 struct vattr *a_vap;
201 } */ *ap;
202 {
203
204 return (EINVAL);
205 }
206
207 static int
208 msdosfs_open(ap)
209 struct vop_open_args /* {
210 struct vnode *a_vp;
211 int a_mode;
212 struct ucred *a_cred;
213 struct thread *a_td;
214 struct file *a_fp;
215 } */ *ap;
216 {
217 struct denode *dep = VTODE(ap->a_vp);
218 vnode_create_vobject(ap->a_vp, dep->de_FileSize, ap->a_td);
219 return 0;
220 }
221
222 static int
223 msdosfs_close(ap)
224 struct vop_close_args /* {
225 struct vnode *a_vp;
226 int a_fflag;
227 struct ucred *a_cred;
228 struct thread *a_td;
229 } */ *ap;
230 {
231 struct vnode *vp = ap->a_vp;
232 struct denode *dep = VTODE(vp);
233 struct timespec ts;
234
235 VI_LOCK(vp);
236 if (vp->v_usecount > 1) {
237 getnanotime(&ts);
238 DETIMES(dep, &ts, &ts, &ts);
239 }
240 VI_UNLOCK(vp);
241 return 0;
242 }
243
244 static int
245 msdosfs_access(ap)
246 struct vop_access_args /* {
247 struct vnode *a_vp;
248 accmode_t a_accmode;
249 struct ucred *a_cred;
250 struct thread *a_td;
251 } */ *ap;
252 {
253 struct vnode *vp = ap->a_vp;
254 struct denode *dep = VTODE(ap->a_vp);
255 struct msdosfsmount *pmp = dep->de_pmp;
256 mode_t file_mode;
257 accmode_t accmode = ap->a_accmode;
258
259 file_mode = (S_IXUSR|S_IXGRP|S_IXOTH) | (S_IRUSR|S_IRGRP|S_IROTH) |
260 ((dep->de_Attributes & ATTR_READONLY) ? 0 : (S_IWUSR|S_IWGRP|S_IWOTH));
261 file_mode &= (vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask);
262
263 /*
264 * Disallow writing to directories and regular files if the
265 * filesystem is read-only.
266 */
267 if (accmode & VWRITE) {
268 switch (vp->v_type) {
269 case VDIR:
270 case VREG:
271 if (vp->v_mount->mnt_flag & MNT_RDONLY)
272 return (EROFS);
273 break;
274 default:
275 break;
276 }
277 }
278
279 return (vaccess(vp->v_type, file_mode, pmp->pm_uid, pmp->pm_gid,
280 ap->a_accmode, ap->a_cred, NULL));
281 }
282
283 static int
284 msdosfs_getattr(ap)
285 struct vop_getattr_args /* {
286 struct vnode *a_vp;
287 struct vattr *a_vap;
288 struct ucred *a_cred;
289 } */ *ap;
290 {
291 struct denode *dep = VTODE(ap->a_vp);
292 struct msdosfsmount *pmp = dep->de_pmp;
293 struct vattr *vap = ap->a_vap;
294 mode_t mode;
295 struct timespec ts;
296 u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry);
297 uint64_t fileid;
298
299 getnanotime(&ts);
300 DETIMES(dep, &ts, &ts, &ts);
301 vap->va_fsid = dev2udev(pmp->pm_dev);
302 /*
303 * The following computation of the fileid must be the same as that
304 * used in msdosfs_readdir() to compute d_fileno. If not, pwd
305 * doesn't work.
306 */
307 if (dep->de_Attributes & ATTR_DIRECTORY) {
308 fileid = (uint64_t)cntobn(pmp, dep->de_StartCluster) *
309 dirsperblk;
310 if (dep->de_StartCluster == MSDOSFSROOT)
311 fileid = 1;
312 } else {
313 fileid = (uint64_t)cntobn(pmp, dep->de_dirclust) *
314 dirsperblk;
315 if (dep->de_dirclust == MSDOSFSROOT)
316 fileid = (uint64_t)roottobn(pmp, 0) * dirsperblk;
317 fileid += (uoff_t)dep->de_diroffset / sizeof(struct direntry);
318 }
319
320 if (pmp->pm_flags & MSDOSFS_LARGEFS)
321 vap->va_fileid = msdosfs_fileno_map(pmp->pm_mountp, fileid);
322 else
323 vap->va_fileid = (long)fileid;
324
325 if ((dep->de_Attributes & ATTR_READONLY) == 0)
326 mode = S_IRWXU|S_IRWXG|S_IRWXO;
327 else
328 mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
329 vap->va_mode = mode &
330 (ap->a_vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask);
331 vap->va_uid = pmp->pm_uid;
332 vap->va_gid = pmp->pm_gid;
333 vap->va_nlink = 1;
334 vap->va_rdev = NODEV;
335 vap->va_size = dep->de_FileSize;
336 fattime2timespec(dep->de_MDate, dep->de_MTime, 0, 0, &vap->va_mtime);
337 vap->va_ctime = vap->va_mtime;
338 if (pmp->pm_flags & MSDOSFSMNT_LONGNAME) {
339 fattime2timespec(dep->de_ADate, 0, 0, 0, &vap->va_atime);
340 fattime2timespec(dep->de_CDate, dep->de_CTime, dep->de_CHun,
341 0, &vap->va_birthtime);
342 } else {
343 vap->va_atime = vap->va_mtime;
344 vap->va_birthtime.tv_sec = -1;
345 vap->va_birthtime.tv_nsec = 0;
346 }
347 vap->va_flags = 0;
348 if ((dep->de_Attributes & ATTR_ARCHIVE) == 0)
349 vap->va_flags |= SF_ARCHIVED;
350 vap->va_gen = 0;
351 vap->va_blocksize = pmp->pm_bpcluster;
352 vap->va_bytes =
353 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask;
354 vap->va_type = ap->a_vp->v_type;
355 vap->va_filerev = dep->de_modrev;
356 return (0);
357 }
358
359 static int
360 msdosfs_setattr(ap)
361 struct vop_setattr_args /* {
362 struct vnode *a_vp;
363 struct vattr *a_vap;
364 struct ucred *a_cred;
365 } */ *ap;
366 {
367 struct vnode *vp = ap->a_vp;
368 struct denode *dep = VTODE(ap->a_vp);
369 struct msdosfsmount *pmp = dep->de_pmp;
370 struct vattr *vap = ap->a_vap;
371 struct ucred *cred = ap->a_cred;
372 struct thread *td = curthread;
373 int error = 0;
374
375 #ifdef MSDOSFS_DEBUG
376 printf("msdosfs_setattr(): vp %p, vap %p, cred %p\n",
377 ap->a_vp, vap, cred);
378 #endif
379
380 /*
381 * Check for unsettable attributes.
382 */
383 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
384 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
385 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
386 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
387 #ifdef MSDOSFS_DEBUG
388 printf("msdosfs_setattr(): returning EINVAL\n");
389 printf(" va_type %d, va_nlink %x, va_fsid %lx, va_fileid %lx\n",
390 vap->va_type, vap->va_nlink, vap->va_fsid, vap->va_fileid);
391 printf(" va_blocksize %lx, va_rdev %x, va_bytes %qx, va_gen %lx\n",
392 vap->va_blocksize, vap->va_rdev, vap->va_bytes, vap->va_gen);
393 printf(" va_uid %x, va_gid %x\n",
394 vap->va_uid, vap->va_gid);
395 #endif
396 return (EINVAL);
397 }
398 if (vap->va_flags != VNOVAL) {
399 if (vp->v_mount->mnt_flag & MNT_RDONLY)
400 return (EROFS);
401 if (cred->cr_uid != pmp->pm_uid) {
402 error = priv_check_cred(cred, PRIV_VFS_ADMIN, 0);
403 if (error)
404 return (error);
405 }
406 /*
407 * We are very inconsistent about handling unsupported
408 * attributes. We ignored the access time and the
409 * read and execute bits. We were strict for the other
410 * attributes.
411 *
412 * Here we are strict, stricter than ufs in not allowing
413 * users to attempt to set SF_SETTABLE bits or anyone to
414 * set unsupported bits. However, we ignore attempts to
415 * set ATTR_ARCHIVE for directories `cp -pr' from a more
416 * sensible filesystem attempts it a lot.
417 */
418 if (vap->va_flags & SF_SETTABLE) {
419 error = priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0);
420 if (error)
421 return (error);
422 }
423 if (vap->va_flags & ~SF_ARCHIVED)
424 return EOPNOTSUPP;
425 if (vap->va_flags & SF_ARCHIVED)
426 dep->de_Attributes &= ~ATTR_ARCHIVE;
427 else if (!(dep->de_Attributes & ATTR_DIRECTORY))
428 dep->de_Attributes |= ATTR_ARCHIVE;
429 dep->de_flag |= DE_MODIFIED;
430 }
431
432 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
433 uid_t uid;
434 gid_t gid;
435
436 if (vp->v_mount->mnt_flag & MNT_RDONLY)
437 return (EROFS);
438 uid = vap->va_uid;
439 if (uid == (uid_t)VNOVAL)
440 uid = pmp->pm_uid;
441 gid = vap->va_gid;
442 if (gid == (gid_t)VNOVAL)
443 gid = pmp->pm_gid;
444 if (cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid ||
445 (gid != pmp->pm_gid && !groupmember(gid, cred))) {
446 error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0);
447 if (error)
448 return (error);
449 }
450 if (uid != pmp->pm_uid || gid != pmp->pm_gid)
451 return EINVAL;
452 }
453
454 if (vap->va_size != VNOVAL) {
455 switch (vp->v_type) {
456 case VDIR:
457 return (EISDIR);
458 case VREG:
459 /*
460 * Truncation is only supported for regular files,
461 * Disallow it if the filesystem is read-only.
462 */
463 if (vp->v_mount->mnt_flag & MNT_RDONLY)
464 return (EROFS);
465 break;
466 default:
467 /*
468 * According to POSIX, the result is unspecified
469 * for file types other than regular files,
470 * directories and shared memory objects. We
471 * don't support any file types except regular
472 * files and directories in this file system, so
473 * this (default) case is unreachable and can do
474 * anything. Keep falling through to detrunc()
475 * for now.
476 */
477 break;
478 }
479 error = detrunc(dep, vap->va_size, 0, cred, td);
480 if (error)
481 return error;
482 }
483 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
484 if (vp->v_mount->mnt_flag & MNT_RDONLY)
485 return (EROFS);
486 if (vap->va_vaflags & VA_UTIMES_NULL) {
487 error = VOP_ACCESS(vp, VADMIN, cred, td);
488 if (error)
489 error = VOP_ACCESS(vp, VWRITE, cred, td);
490 } else
491 error = VOP_ACCESS(vp, VADMIN, cred, td);
492 if (vp->v_type != VDIR) {
493 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 &&
494 vap->va_atime.tv_sec != VNOVAL) {
495 dep->de_flag &= ~DE_ACCESS;
496 timespec2fattime(&vap->va_atime, 0,
497 &dep->de_ADate, NULL, NULL);
498 }
499 if (vap->va_mtime.tv_sec != VNOVAL) {
500 dep->de_flag &= ~DE_UPDATE;
501 timespec2fattime(&vap->va_mtime, 0,
502 &dep->de_MDate, &dep->de_MTime, NULL);
503 }
504 dep->de_Attributes |= ATTR_ARCHIVE;
505 dep->de_flag |= DE_MODIFIED;
506 }
507 }
508 /*
509 * DOS files only have the ability to have their writability
510 * attribute set, so we use the owner write bit to set the readonly
511 * attribute.
512 */
513 if (vap->va_mode != (mode_t)VNOVAL) {
514 if (vp->v_mount->mnt_flag & MNT_RDONLY)
515 return (EROFS);
516 if (cred->cr_uid != pmp->pm_uid) {
517 error = priv_check_cred(cred, PRIV_VFS_ADMIN, 0);
518 if (error)
519 return (error);
520 }
521 if (vp->v_type != VDIR) {
522 /* We ignore the read and execute bits. */
523 if (vap->va_mode & VWRITE)
524 dep->de_Attributes &= ~ATTR_READONLY;
525 else
526 dep->de_Attributes |= ATTR_READONLY;
527 dep->de_Attributes |= ATTR_ARCHIVE;
528 dep->de_flag |= DE_MODIFIED;
529 }
530 }
531 return (deupdat(dep, 0));
532 }
533
534 static int
535 msdosfs_read(ap)
536 struct vop_read_args /* {
537 struct vnode *a_vp;
538 struct uio *a_uio;
539 int a_ioflag;
540 struct ucred *a_cred;
541 } */ *ap;
542 {
543 int error = 0;
544 int blsize;
545 int isadir;
546 int orig_resid;
547 u_int n;
548 u_long diff;
549 u_long on;
550 daddr_t lbn;
551 daddr_t rablock;
552 int rasize;
553 int seqcount;
554 struct buf *bp;
555 struct vnode *vp = ap->a_vp;
556 struct denode *dep = VTODE(vp);
557 struct msdosfsmount *pmp = dep->de_pmp;
558 struct uio *uio = ap->a_uio;
559
560 /*
561 * If they didn't ask for any data, then we are done.
562 */
563 orig_resid = uio->uio_resid;
564 if (orig_resid == 0)
565 return (0);
566
567 /*
568 * The caller is supposed to ensure that
569 * uio->uio_offset >= 0 and uio->uio_resid >= 0.
570 * We don't need to check for large offsets as in ffs because
571 * dep->de_FileSize <= DOS_FILESIZE_MAX < OFF_MAX, so large
572 * offsets cannot cause overflow even in theory.
573 */
574
575 seqcount = ap->a_ioflag >> IO_SEQSHIFT;
576
577 isadir = dep->de_Attributes & ATTR_DIRECTORY;
578 do {
579 if (uio->uio_offset >= dep->de_FileSize)
580 break;
581 lbn = de_cluster(pmp, uio->uio_offset);
582 rablock = lbn + 1;
583 blsize = pmp->pm_bpcluster;
584 on = uio->uio_offset & pmp->pm_crbomask;
585 /*
586 * If we are operating on a directory file then be sure to
587 * do i/o with the vnode for the filesystem instead of the
588 * vnode for the directory.
589 */
590 if (isadir) {
591 /* convert cluster # to block # */
592 error = pcbmap(dep, lbn, &lbn, 0, &blsize);
593 if (error == E2BIG) {
594 error = EINVAL;
595 break;
596 } else if (error)
597 break;
598 error = bread(pmp->pm_devvp, lbn, blsize, NOCRED, &bp);
599 } else if (de_cn2off(pmp, rablock) >= dep->de_FileSize) {
600 error = bread(vp, lbn, blsize, NOCRED, &bp);
601 } else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) {
602 error = cluster_read(vp, dep->de_FileSize, lbn, blsize,
603 NOCRED, on + uio->uio_resid, seqcount, &bp);
604 } else if (seqcount > 1) {
605 rasize = blsize;
606 error = breadn(vp, lbn,
607 blsize, &rablock, &rasize, 1, NOCRED, &bp);
608 } else {
609 error = bread(vp, lbn, blsize, NOCRED, &bp);
610 }
611 if (error) {
612 brelse(bp);
613 break;
614 }
615 diff = pmp->pm_bpcluster - on;
616 n = diff > uio->uio_resid ? uio->uio_resid : diff;
617 diff = dep->de_FileSize - uio->uio_offset;
618 if (diff < n)
619 n = diff;
620 diff = blsize - bp->b_resid;
621 if (diff < n)
622 n = diff;
623 error = uiomove(bp->b_data + on, (int) n, uio);
624 brelse(bp);
625 } while (error == 0 && uio->uio_resid > 0 && n != 0);
626 if (!isadir && (error == 0 || uio->uio_resid != orig_resid) &&
627 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0)
628 dep->de_flag |= DE_ACCESS;
629 return (error);
630 }
631
632 /*
633 * Write data to a file or directory.
634 */
635 static int
636 msdosfs_write(ap)
637 struct vop_write_args /* {
638 struct vnode *a_vp;
639 struct uio *a_uio;
640 int a_ioflag;
641 struct ucred *a_cred;
642 } */ *ap;
643 {
644 int n;
645 int croffset;
646 int resid;
647 u_long osize;
648 int error = 0;
649 u_long count;
650 int seqcount;
651 daddr_t bn, lastcn;
652 struct buf *bp;
653 int ioflag = ap->a_ioflag;
654 struct uio *uio = ap->a_uio;
655 struct thread *td = uio->uio_td;
656 struct vnode *vp = ap->a_vp;
657 struct vnode *thisvp;
658 struct denode *dep = VTODE(vp);
659 struct msdosfsmount *pmp = dep->de_pmp;
660 struct ucred *cred = ap->a_cred;
661
662 #ifdef MSDOSFS_DEBUG
663 printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n",
664 vp, uio, ioflag, cred);
665 printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n",
666 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster);
667 #endif
668
669 switch (vp->v_type) {
670 case VREG:
671 if (ioflag & IO_APPEND)
672 uio->uio_offset = dep->de_FileSize;
673 thisvp = vp;
674 break;
675 case VDIR:
676 return EISDIR;
677 default:
678 panic("msdosfs_write(): bad file type");
679 }
680
681 /*
682 * This is needed (unlike in ffs_write()) because we extend the
683 * file outside of the loop but we don't want to extend the file
684 * for writes of 0 bytes.
685 */
686 if (uio->uio_resid == 0)
687 return (0);
688
689 /*
690 * The caller is supposed to ensure that
691 * uio->uio_offset >= 0 and uio->uio_resid >= 0.
692 */
693 if ((uoff_t)uio->uio_offset + uio->uio_resid > DOS_FILESIZE_MAX)
694 return (EFBIG);
695
696 /*
697 * If they've exceeded their filesize limit, tell them about it.
698 */
699 if (vn_rlimit_fsize(vp, uio, td))
700 return (EFBIG);
701
702 /*
703 * If the offset we are starting the write at is beyond the end of
704 * the file, then they've done a seek. Unix filesystems allow
705 * files with holes in them, DOS doesn't so we must fill the hole
706 * with zeroed blocks.
707 */
708 if (uio->uio_offset > dep->de_FileSize) {
709 error = deextend(dep, uio->uio_offset, cred);
710 if (error)
711 return (error);
712 }
713
714 /*
715 * Remember some values in case the write fails.
716 */
717 resid = uio->uio_resid;
718 osize = dep->de_FileSize;
719
720 /*
721 * If we write beyond the end of the file, extend it to its ultimate
722 * size ahead of the time to hopefully get a contiguous area.
723 */
724 if (uio->uio_offset + resid > osize) {
725 count = de_clcount(pmp, uio->uio_offset + resid) -
726 de_clcount(pmp, osize);
727 error = extendfile(dep, count, NULL, NULL, 0);
728 if (error && (error != ENOSPC || (ioflag & IO_UNIT)))
729 goto errexit;
730 lastcn = dep->de_fc[FC_LASTFC].fc_frcn;
731 } else
732 lastcn = de_clcount(pmp, osize) - 1;
733
734 seqcount = ioflag >> IO_SEQSHIFT;
735 do {
736 if (de_cluster(pmp, uio->uio_offset) > lastcn) {
737 error = ENOSPC;
738 break;
739 }
740
741 croffset = uio->uio_offset & pmp->pm_crbomask;
742 n = min(uio->uio_resid, pmp->pm_bpcluster - croffset);
743 if (uio->uio_offset + n > dep->de_FileSize) {
744 dep->de_FileSize = uio->uio_offset + n;
745 /* The object size needs to be set before buffer is allocated */
746 vnode_pager_setsize(vp, dep->de_FileSize);
747 }
748
749 bn = de_cluster(pmp, uio->uio_offset);
750 if ((uio->uio_offset & pmp->pm_crbomask) == 0
751 && (de_cluster(pmp, uio->uio_offset + uio->uio_resid)
752 > de_cluster(pmp, uio->uio_offset)
753 || uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) {
754 /*
755 * If either the whole cluster gets written,
756 * or we write the cluster from its start beyond EOF,
757 * then no need to read data from disk.
758 */
759 bp = getblk(thisvp, bn, pmp->pm_bpcluster, 0, 0, 0);
760 vfs_bio_clrbuf(bp);
761 /*
762 * Do the bmap now, since pcbmap needs buffers
763 * for the fat table. (see msdosfs_strategy)
764 */
765 if (bp->b_blkno == bp->b_lblkno) {
766 error = pcbmap(dep, bp->b_lblkno, &bn, 0, 0);
767 if (error)
768 bp->b_blkno = -1;
769 else
770 bp->b_blkno = bn;
771 }
772 if (bp->b_blkno == -1) {
773 brelse(bp);
774 if (!error)
775 error = EIO; /* XXX */
776 break;
777 }
778 } else {
779 /*
780 * The block we need to write into exists, so read it in.
781 */
782 error = bread(thisvp, bn, pmp->pm_bpcluster, cred, &bp);
783 if (error) {
784 brelse(bp);
785 break;
786 }
787 }
788
789 /*
790 * Should these vnode_pager_* functions be done on dir
791 * files?
792 */
793
794 /*
795 * Copy the data from user space into the buf header.
796 */
797 error = uiomove(bp->b_data + croffset, n, uio);
798 if (error) {
799 brelse(bp);
800 break;
801 }
802
803 /* Prepare for clustered writes in some else clauses. */
804 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0)
805 bp->b_flags |= B_CLUSTEROK;
806
807 /*
808 * If IO_SYNC, then each buffer is written synchronously.
809 * Otherwise, if we have a severe page deficiency then
810 * write the buffer asynchronously. Otherwise, if on a
811 * cluster boundary then write the buffer asynchronously,
812 * combining it with contiguous clusters if permitted and
813 * possible, since we don't expect more writes into this
814 * buffer soon. Otherwise, do a delayed write because we
815 * expect more writes into this buffer soon.
816 */
817 if (ioflag & IO_SYNC)
818 (void)bwrite(bp);
819 else if (vm_page_count_severe() || buf_dirty_count_severe())
820 bawrite(bp);
821 else if (n + croffset == pmp->pm_bpcluster) {
822 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0)
823 cluster_write(vp, bp, dep->de_FileSize,
824 seqcount);
825 else
826 bawrite(bp);
827 } else
828 bdwrite(bp);
829 dep->de_flag |= DE_UPDATE;
830 } while (error == 0 && uio->uio_resid > 0);
831
832 /*
833 * If the write failed and they want us to, truncate the file back
834 * to the size it was before the write was attempted.
835 */
836 errexit:
837 if (error) {
838 if (ioflag & IO_UNIT) {
839 detrunc(dep, osize, ioflag & IO_SYNC, NOCRED, NULL);
840 uio->uio_offset -= resid - uio->uio_resid;
841 uio->uio_resid = resid;
842 } else {
843 detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC, NOCRED, NULL);
844 if (uio->uio_resid != resid)
845 error = 0;
846 }
847 } else if (ioflag & IO_SYNC)
848 error = deupdat(dep, 1);
849 return (error);
850 }
851
852 /*
853 * Flush the blocks of a file to disk.
854 *
855 * This function is worthless for vnodes that represent directories. Maybe we
856 * could just do a sync if they try an fsync on a directory file.
857 */
858 static int
859 msdosfs_fsync(ap)
860 struct vop_fsync_args /* {
861 struct vnode *a_vp;
862 struct ucred *a_cred;
863 int a_waitfor;
864 struct thread *a_td;
865 } */ *ap;
866 {
867
868 vop_stdfsync(ap);
869 return (deupdat(VTODE(ap->a_vp), ap->a_waitfor == MNT_WAIT));
870 }
871
872 static int
873 msdosfs_remove(ap)
874 struct vop_remove_args /* {
875 struct vnode *a_dvp;
876 struct vnode *a_vp;
877 struct componentname *a_cnp;
878 } */ *ap;
879 {
880 struct denode *dep = VTODE(ap->a_vp);
881 struct denode *ddep = VTODE(ap->a_dvp);
882 int error;
883
884 if (ap->a_vp->v_type == VDIR)
885 error = EPERM;
886 else
887 error = removede(ddep, dep);
888 #ifdef MSDOSFS_DEBUG
889 printf("msdosfs_remove(), dep %p, v_usecount %d\n", dep, ap->a_vp->v_usecount);
890 #endif
891 return (error);
892 }
893
894 /*
895 * DOS filesystems don't know what links are.
896 */
897 static int
898 msdosfs_link(ap)
899 struct vop_link_args /* {
900 struct vnode *a_tdvp;
901 struct vnode *a_vp;
902 struct componentname *a_cnp;
903 } */ *ap;
904 {
905 return (EOPNOTSUPP);
906 }
907
908 /*
909 * Renames on files require moving the denode to a new hash queue since the
910 * denode's location is used to compute which hash queue to put the file
911 * in. Unless it is a rename in place. For example "mv a b".
912 *
913 * What follows is the basic algorithm:
914 *
915 * if (file move) {
916 * if (dest file exists) {
917 * remove dest file
918 * }
919 * if (dest and src in same directory) {
920 * rewrite name in existing directory slot
921 * } else {
922 * write new entry in dest directory
923 * update offset and dirclust in denode
924 * move denode to new hash chain
925 * clear old directory entry
926 * }
927 * } else {
928 * directory move
929 * if (dest directory exists) {
930 * if (dest is not empty) {
931 * return ENOTEMPTY
932 * }
933 * remove dest directory
934 * }
935 * if (dest and src in same directory) {
936 * rewrite name in existing entry
937 * } else {
938 * be sure dest is not a child of src directory
939 * write entry in dest directory
940 * update "." and ".." in moved directory
941 * clear old directory entry for moved directory
942 * }
943 * }
944 *
945 * On entry:
946 * source's parent directory is unlocked
947 * source file or directory is unlocked
948 * destination's parent directory is locked
949 * destination file or directory is locked if it exists
950 *
951 * On exit:
952 * all denodes should be released
953 */
954 static int
955 msdosfs_rename(ap)
956 struct vop_rename_args /* {
957 struct vnode *a_fdvp;
958 struct vnode *a_fvp;
959 struct componentname *a_fcnp;
960 struct vnode *a_tdvp;
961 struct vnode *a_tvp;
962 struct componentname *a_tcnp;
963 } */ *ap;
964 {
965 struct vnode *tdvp = ap->a_tdvp;
966 struct vnode *fvp = ap->a_fvp;
967 struct vnode *fdvp = ap->a_fdvp;
968 struct vnode *tvp = ap->a_tvp;
969 struct componentname *tcnp = ap->a_tcnp;
970 struct componentname *fcnp = ap->a_fcnp;
971 struct denode *ip, *xp, *dp, *zp;
972 u_char toname[12], oldname[11];
973 u_long from_diroffset, to_diroffset;
974 u_char to_count;
975 int doingdirectory = 0, newparent = 0;
976 int error;
977 u_long cn, pcl;
978 daddr_t bn;
979 struct denode *fddep; /* from file's parent directory */
980 struct msdosfsmount *pmp;
981 struct direntry *dotdotp;
982 struct buf *bp;
983
984 fddep = VTODE(ap->a_fdvp);
985 pmp = fddep->de_pmp;
986
987 pmp = VFSTOMSDOSFS(fdvp->v_mount);
988
989 #ifdef DIAGNOSTIC
990 if ((tcnp->cn_flags & HASBUF) == 0 ||
991 (fcnp->cn_flags & HASBUF) == 0)
992 panic("msdosfs_rename: no name");
993 #endif
994 /*
995 * Check for cross-device rename.
996 */
997 if (fvp->v_mount != tdvp->v_mount ||
998 (tvp && fvp->v_mount != tvp->v_mount)) {
999 error = EXDEV;
1000 abortit:
1001 if (tdvp == tvp)
1002 vrele(tdvp);
1003 else
1004 vput(tdvp);
1005 if (tvp)
1006 vput(tvp);
1007 vrele(fdvp);
1008 vrele(fvp);
1009 return (error);
1010 }
1011
1012 /*
1013 * If source and dest are the same, do nothing.
1014 */
1015 if (tvp == fvp) {
1016 error = 0;
1017 goto abortit;
1018 }
1019
1020 error = vn_lock(fvp, LK_EXCLUSIVE);
1021 if (error)
1022 goto abortit;
1023 dp = VTODE(fdvp);
1024 ip = VTODE(fvp);
1025
1026 /*
1027 * Be sure we are not renaming ".", "..", or an alias of ".". This
1028 * leads to a crippled directory tree. It's pretty tough to do a
1029 * "ls" or "pwd" with the "." directory entry missing, and "cd .."
1030 * doesn't work if the ".." entry is missing.
1031 */
1032 if (ip->de_Attributes & ATTR_DIRECTORY) {
1033 /*
1034 * Avoid ".", "..", and aliases of "." for obvious reasons.
1035 */
1036 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
1037 dp == ip ||
1038 (fcnp->cn_flags & ISDOTDOT) ||
1039 (tcnp->cn_flags & ISDOTDOT) ||
1040 (ip->de_flag & DE_RENAME)) {
1041 VOP_UNLOCK(fvp, 0);
1042 error = EINVAL;
1043 goto abortit;
1044 }
1045 ip->de_flag |= DE_RENAME;
1046 doingdirectory++;
1047 }
1048
1049 /*
1050 * When the target exists, both the directory
1051 * and target vnodes are returned locked.
1052 */
1053 dp = VTODE(tdvp);
1054 xp = tvp ? VTODE(tvp) : NULL;
1055 /*
1056 * Remember direntry place to use for destination
1057 */
1058 to_diroffset = dp->de_fndoffset;
1059 to_count = dp->de_fndcnt;
1060
1061 /*
1062 * If ".." must be changed (ie the directory gets a new
1063 * parent) then the source directory must not be in the
1064 * directory hierarchy above the target, as this would
1065 * orphan everything below the source directory. Also
1066 * the user must have write permission in the source so
1067 * as to be able to change "..". We must repeat the call
1068 * to namei, as the parent directory is unlocked by the
1069 * call to doscheckpath().
1070 */
1071 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread);
1072 VOP_UNLOCK(fvp, 0);
1073 if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster)
1074 newparent = 1;
1075 if (doingdirectory && newparent) {
1076 if (error) /* write access check above */
1077 goto bad;
1078 if (xp != NULL)
1079 vput(tvp);
1080 /*
1081 * doscheckpath() vput()'s dp,
1082 * so we have to do a relookup afterwards
1083 */
1084 error = doscheckpath(ip, dp);
1085 if (error)
1086 goto out;
1087 if ((tcnp->cn_flags & SAVESTART) == 0)
1088 panic("msdosfs_rename: lost to startdir");
1089 error = relookup(tdvp, &tvp, tcnp);
1090 if (error)
1091 goto out;
1092 dp = VTODE(tdvp);
1093 xp = tvp ? VTODE(tvp) : NULL;
1094 }
1095
1096 if (xp != NULL) {
1097 /*
1098 * Target must be empty if a directory and have no links
1099 * to it. Also, ensure source and target are compatible
1100 * (both directories, or both not directories).
1101 */
1102 if (xp->de_Attributes & ATTR_DIRECTORY) {
1103 if (!dosdirempty(xp)) {
1104 error = ENOTEMPTY;
1105 goto bad;
1106 }
1107 if (!doingdirectory) {
1108 error = ENOTDIR;
1109 goto bad;
1110 }
1111 cache_purge(tdvp);
1112 } else if (doingdirectory) {
1113 error = EISDIR;
1114 goto bad;
1115 }
1116 error = removede(dp, xp);
1117 if (error)
1118 goto bad;
1119 vput(tvp);
1120 xp = NULL;
1121 }
1122
1123 /*
1124 * Convert the filename in tcnp into a dos filename. We copy this
1125 * into the denode and directory entry for the destination
1126 * file/directory.
1127 */
1128 error = uniqdosname(VTODE(tdvp), tcnp, toname);
1129 if (error)
1130 goto abortit;
1131
1132 /*
1133 * Since from wasn't locked at various places above,
1134 * have to do a relookup here.
1135 */
1136 fcnp->cn_flags &= ~MODMASK;
1137 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
1138 if ((fcnp->cn_flags & SAVESTART) == 0)
1139 panic("msdosfs_rename: lost from startdir");
1140 if (!newparent)
1141 VOP_UNLOCK(tdvp, 0);
1142 if (relookup(fdvp, &fvp, fcnp) == 0)
1143 vrele(fdvp);
1144 if (fvp == NULL) {
1145 /*
1146 * From name has disappeared.
1147 */
1148 if (doingdirectory)
1149 panic("rename: lost dir entry");
1150 if (newparent)
1151 VOP_UNLOCK(tdvp, 0);
1152 vrele(tdvp);
1153 vrele(ap->a_fvp);
1154 return 0;
1155 }
1156 xp = VTODE(fvp);
1157 zp = VTODE(fdvp);
1158 from_diroffset = zp->de_fndoffset;
1159
1160 /*
1161 * Ensure that the directory entry still exists and has not
1162 * changed till now. If the source is a file the entry may
1163 * have been unlinked or renamed. In either case there is
1164 * no further work to be done. If the source is a directory
1165 * then it cannot have been rmdir'ed or renamed; this is
1166 * prohibited by the DE_RENAME flag.
1167 */
1168 if (xp != ip) {
1169 if (doingdirectory)
1170 panic("rename: lost dir entry");
1171 VOP_UNLOCK(fvp, 0);
1172 if (newparent)
1173 VOP_UNLOCK(fdvp, 0);
1174 vrele(ap->a_fvp);
1175 xp = NULL;
1176 } else {
1177 vrele(fvp);
1178 xp = NULL;
1179
1180 /*
1181 * First write a new entry in the destination
1182 * directory and mark the entry in the source directory
1183 * as deleted. Then move the denode to the correct hash
1184 * chain for its new location in the filesystem. And, if
1185 * we moved a directory, then update its .. entry to point
1186 * to the new parent directory.
1187 */
1188 bcopy(ip->de_Name, oldname, 11);
1189 bcopy(toname, ip->de_Name, 11); /* update denode */
1190 dp->de_fndoffset = to_diroffset;
1191 dp->de_fndcnt = to_count;
1192 error = createde(ip, dp, (struct denode **)0, tcnp);
1193 if (error) {
1194 bcopy(oldname, ip->de_Name, 11);
1195 if (newparent)
1196 VOP_UNLOCK(fdvp, 0);
1197 VOP_UNLOCK(fvp, 0);
1198 goto bad;
1199 }
1200 ip->de_refcnt++;
1201 zp->de_fndoffset = from_diroffset;
1202 error = removede(zp, ip);
1203 if (error) {
1204 /* XXX should downgrade to ro here, fs is corrupt */
1205 if (newparent)
1206 VOP_UNLOCK(fdvp, 0);
1207 VOP_UNLOCK(fvp, 0);
1208 goto bad;
1209 }
1210 if (!doingdirectory) {
1211 error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0,
1212 &ip->de_dirclust, 0);
1213 if (error) {
1214 /* XXX should downgrade to ro here, fs is corrupt */
1215 if (newparent)
1216 VOP_UNLOCK(fdvp, 0);
1217 VOP_UNLOCK(fvp, 0);
1218 goto bad;
1219 }
1220 if (ip->de_dirclust == MSDOSFSROOT)
1221 ip->de_diroffset = to_diroffset;
1222 else
1223 ip->de_diroffset = to_diroffset & pmp->pm_crbomask;
1224 }
1225 reinsert(ip);
1226 if (newparent)
1227 VOP_UNLOCK(fdvp, 0);
1228 }
1229
1230 /*
1231 * If we moved a directory to a new parent directory, then we must
1232 * fixup the ".." entry in the moved directory.
1233 */
1234 if (doingdirectory && newparent) {
1235 cn = ip->de_StartCluster;
1236 if (cn == MSDOSFSROOT) {
1237 /* this should never happen */
1238 panic("msdosfs_rename(): updating .. in root directory?");
1239 } else
1240 bn = cntobn(pmp, cn);
1241 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster,
1242 NOCRED, &bp);
1243 if (error) {
1244 /* XXX should downgrade to ro here, fs is corrupt */
1245 brelse(bp);
1246 VOP_UNLOCK(fvp, 0);
1247 goto bad;
1248 }
1249 dotdotp = (struct direntry *)bp->b_data + 1;
1250 pcl = dp->de_StartCluster;
1251 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk)
1252 pcl = MSDOSFSROOT;
1253 putushort(dotdotp->deStartCluster, pcl);
1254 if (FAT32(pmp))
1255 putushort(dotdotp->deHighClust, pcl >> 16);
1256 if (fvp->v_mount->mnt_flag & MNT_ASYNC)
1257 bdwrite(bp);
1258 else if ((error = bwrite(bp)) != 0) {
1259 /* XXX should downgrade to ro here, fs is corrupt */
1260 VOP_UNLOCK(fvp, 0);
1261 goto bad;
1262 }
1263 }
1264
1265 /*
1266 * The msdosfs lookup is case insensitive. Several aliases may
1267 * be inserted for a single directory entry. As a consequnce,
1268 * name cache purge done by lookup for fvp when DELETE op for
1269 * namei is specified, might be not enough to expunge all
1270 * namecache entries that were installed for this direntry.
1271 */
1272 cache_purge(fvp);
1273 VOP_UNLOCK(fvp, 0);
1274 bad:
1275 if (xp)
1276 vput(tvp);
1277 vput(tdvp);
1278 out:
1279 ip->de_flag &= ~DE_RENAME;
1280 vrele(fdvp);
1281 vrele(fvp);
1282 return (error);
1283
1284 }
1285
1286 static struct {
1287 struct direntry dot;
1288 struct direntry dotdot;
1289 } dosdirtemplate = {
1290 { ". ", /* the . entry */
1291 ATTR_DIRECTORY, /* file attribute */
1292 0, /* reserved */
1293 0, { 0, 0 }, { 0, 0 }, /* create time & date */
1294 { 0, 0 }, /* access date */
1295 { 0, 0 }, /* high bits of start cluster */
1296 { 210, 4 }, { 210, 4 }, /* modify time & date */
1297 { 0, 0 }, /* startcluster */
1298 { 0, 0, 0, 0 } /* filesize */
1299 },
1300 { ".. ", /* the .. entry */
1301 ATTR_DIRECTORY, /* file attribute */
1302 0, /* reserved */
1303 0, { 0, 0 }, { 0, 0 }, /* create time & date */
1304 { 0, 0 }, /* access date */
1305 { 0, 0 }, /* high bits of start cluster */
1306 { 210, 4 }, { 210, 4 }, /* modify time & date */
1307 { 0, 0 }, /* startcluster */
1308 { 0, 0, 0, 0 } /* filesize */
1309 }
1310 };
1311
1312 static int
1313 msdosfs_mkdir(ap)
1314 struct vop_mkdir_args /* {
1315 struct vnode *a_dvp;
1316 struct vnode **a_vpp;
1317 struvt componentname *a_cnp;
1318 struct vattr *a_vap;
1319 } */ *ap;
1320 {
1321 struct componentname *cnp = ap->a_cnp;
1322 struct denode *dep;
1323 struct denode *pdep = VTODE(ap->a_dvp);
1324 struct direntry *denp;
1325 struct msdosfsmount *pmp = pdep->de_pmp;
1326 struct buf *bp;
1327 u_long newcluster, pcl;
1328 int bn;
1329 int error;
1330 struct denode ndirent;
1331 struct timespec ts;
1332
1333 /*
1334 * If this is the root directory and there is no space left we
1335 * can't do anything. This is because the root directory can not
1336 * change size.
1337 */
1338 if (pdep->de_StartCluster == MSDOSFSROOT
1339 && pdep->de_fndoffset >= pdep->de_FileSize) {
1340 error = ENOSPC;
1341 goto bad2;
1342 }
1343
1344 /*
1345 * Allocate a cluster to hold the about to be created directory.
1346 */
1347 error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL);
1348 if (error)
1349 goto bad2;
1350
1351 bzero(&ndirent, sizeof(ndirent));
1352 ndirent.de_pmp = pmp;
1353 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE;
1354 getnanotime(&ts);
1355 DETIMES(&ndirent, &ts, &ts, &ts);
1356
1357 /*
1358 * Now fill the cluster with the "." and ".." entries. And write
1359 * the cluster to disk. This way it is there for the parent
1360 * directory to be pointing at if there were a crash.
1361 */
1362 bn = cntobn(pmp, newcluster);
1363 /* always succeeds */
1364 bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0, 0);
1365 bzero(bp->b_data, pmp->pm_bpcluster);
1366 bcopy(&dosdirtemplate, bp->b_data, sizeof dosdirtemplate);
1367 denp = (struct direntry *)bp->b_data;
1368 putushort(denp[0].deStartCluster, newcluster);
1369 putushort(denp[0].deCDate, ndirent.de_CDate);
1370 putushort(denp[0].deCTime, ndirent.de_CTime);
1371 denp[0].deCHundredth = ndirent.de_CHun;
1372 putushort(denp[0].deADate, ndirent.de_ADate);
1373 putushort(denp[0].deMDate, ndirent.de_MDate);
1374 putushort(denp[0].deMTime, ndirent.de_MTime);
1375 pcl = pdep->de_StartCluster;
1376 /*
1377 * Although the root directory has a non-magic starting cluster
1378 * number for FAT32, chkdsk and fsck_msdosfs still require
1379 * references to it in dotdot entries to be magic.
1380 */
1381 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk)
1382 pcl = MSDOSFSROOT;
1383 putushort(denp[1].deStartCluster, pcl);
1384 putushort(denp[1].deCDate, ndirent.de_CDate);
1385 putushort(denp[1].deCTime, ndirent.de_CTime);
1386 denp[1].deCHundredth = ndirent.de_CHun;
1387 putushort(denp[1].deADate, ndirent.de_ADate);
1388 putushort(denp[1].deMDate, ndirent.de_MDate);
1389 putushort(denp[1].deMTime, ndirent.de_MTime);
1390 if (FAT32(pmp)) {
1391 putushort(denp[0].deHighClust, newcluster >> 16);
1392 putushort(denp[1].deHighClust, pcl >> 16);
1393 }
1394
1395 if (ap->a_dvp->v_mount->mnt_flag & MNT_ASYNC)
1396 bdwrite(bp);
1397 else if ((error = bwrite(bp)) != 0)
1398 goto bad;
1399
1400 /*
1401 * Now build up a directory entry pointing to the newly allocated
1402 * cluster. This will be written to an empty slot in the parent
1403 * directory.
1404 */
1405 #ifdef DIAGNOSTIC
1406 if ((cnp->cn_flags & HASBUF) == 0)
1407 panic("msdosfs_mkdir: no name");
1408 #endif
1409 error = uniqdosname(pdep, cnp, ndirent.de_Name);
1410 if (error)
1411 goto bad;
1412
1413 ndirent.de_Attributes = ATTR_DIRECTORY;
1414 ndirent.de_LowerCase = 0;
1415 ndirent.de_StartCluster = newcluster;
1416 ndirent.de_FileSize = 0;
1417 error = createde(&ndirent, pdep, &dep, cnp);
1418 if (error)
1419 goto bad;
1420 *ap->a_vpp = DETOV(dep);
1421 return (0);
1422
1423 bad:
1424 clusterfree(pmp, newcluster, NULL);
1425 bad2:
1426 return (error);
1427 }
1428
1429 static int
1430 msdosfs_rmdir(ap)
1431 struct vop_rmdir_args /* {
1432 struct vnode *a_dvp;
1433 struct vnode *a_vp;
1434 struct componentname *a_cnp;
1435 } */ *ap;
1436 {
1437 struct vnode *vp = ap->a_vp;
1438 struct vnode *dvp = ap->a_dvp;
1439 struct componentname *cnp = ap->a_cnp;
1440 struct denode *ip, *dp;
1441 struct thread *td = cnp->cn_thread;
1442 int error;
1443
1444 ip = VTODE(vp);
1445 dp = VTODE(dvp);
1446
1447 /*
1448 * Verify the directory is empty (and valid).
1449 * (Rmdir ".." won't be valid since
1450 * ".." will contain a reference to
1451 * the current directory and thus be
1452 * non-empty.)
1453 */
1454 error = 0;
1455 if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) {
1456 error = ENOTEMPTY;
1457 goto out;
1458 }
1459 /*
1460 * Delete the entry from the directory. For dos filesystems this
1461 * gets rid of the directory entry on disk, the in memory copy
1462 * still exists but the de_refcnt is <= 0. This prevents it from
1463 * being found by deget(). When the vput() on dep is done we give
1464 * up access and eventually msdosfs_reclaim() will be called which
1465 * will remove it from the denode cache.
1466 */
1467 error = removede(dp, ip);
1468 if (error)
1469 goto out;
1470 /*
1471 * This is where we decrement the link count in the parent
1472 * directory. Since dos filesystems don't do this we just purge
1473 * the name cache.
1474 */
1475 cache_purge(dvp);
1476 /*
1477 * Truncate the directory that is being deleted.
1478 */
1479 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred, td);
1480 cache_purge(vp);
1481
1482 out:
1483 return (error);
1484 }
1485
1486 /*
1487 * DOS filesystems don't know what symlinks are.
1488 */
1489 static int
1490 msdosfs_symlink(ap)
1491 struct vop_symlink_args /* {
1492 struct vnode *a_dvp;
1493 struct vnode **a_vpp;
1494 struct componentname *a_cnp;
1495 struct vattr *a_vap;
1496 char *a_target;
1497 } */ *ap;
1498 {
1499 return (EOPNOTSUPP);
1500 }
1501
1502 static int
1503 msdosfs_readdir(ap)
1504 struct vop_readdir_args /* {
1505 struct vnode *a_vp;
1506 struct uio *a_uio;
1507 struct ucred *a_cred;
1508 int *a_eofflag;
1509 int *a_ncookies;
1510 u_long **a_cookies;
1511 } */ *ap;
1512 {
1513 struct mbnambuf nb;
1514 int error = 0;
1515 int diff;
1516 long n;
1517 int blsize;
1518 long on;
1519 u_long cn;
1520 uint64_t fileno;
1521 u_long dirsperblk;
1522 long bias = 0;
1523 daddr_t bn, lbn;
1524 struct buf *bp;
1525 struct denode *dep = VTODE(ap->a_vp);
1526 struct msdosfsmount *pmp = dep->de_pmp;
1527 struct direntry *dentp;
1528 struct dirent dirbuf;
1529 struct uio *uio = ap->a_uio;
1530 u_long *cookies = NULL;
1531 int ncookies = 0;
1532 off_t offset, off;
1533 int chksum = -1;
1534
1535 #ifdef MSDOSFS_DEBUG
1536 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n",
1537 ap->a_vp, uio, ap->a_cred, ap->a_eofflag);
1538 #endif
1539
1540 /*
1541 * msdosfs_readdir() won't operate properly on regular files since
1542 * it does i/o only with the filesystem vnode, and hence can
1543 * retrieve the wrong block from the buffer cache for a plain file.
1544 * So, fail attempts to readdir() on a plain file.
1545 */
1546 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0)
1547 return (ENOTDIR);
1548
1549 /*
1550 * To be safe, initialize dirbuf
1551 */
1552 bzero(dirbuf.d_name, sizeof(dirbuf.d_name));
1553
1554 /*
1555 * If the user buffer is smaller than the size of one dos directory
1556 * entry or the file offset is not a multiple of the size of a
1557 * directory entry, then we fail the read.
1558 */
1559 off = offset = uio->uio_offset;
1560 if (uio->uio_resid < sizeof(struct direntry) ||
1561 (offset & (sizeof(struct direntry) - 1)))
1562 return (EINVAL);
1563
1564 if (ap->a_ncookies) {
1565 ncookies = uio->uio_resid / 16;
1566 cookies = malloc(ncookies * sizeof(u_long), M_TEMP,
1567 M_WAITOK);
1568 *ap->a_cookies = cookies;
1569 *ap->a_ncookies = ncookies;
1570 }
1571
1572 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry);
1573
1574 /*
1575 * If they are reading from the root directory then, we simulate
1576 * the . and .. entries since these don't exist in the root
1577 * directory. We also set the offset bias to make up for having to
1578 * simulate these entries. By this I mean that at file offset 64 we
1579 * read the first entry in the root directory that lives on disk.
1580 */
1581 if (dep->de_StartCluster == MSDOSFSROOT
1582 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) {
1583 #if 0
1584 printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n",
1585 offset);
1586 #endif
1587 bias = 2 * sizeof(struct direntry);
1588 if (offset < bias) {
1589 for (n = (int)offset / sizeof(struct direntry);
1590 n < 2; n++) {
1591 if (FAT32(pmp))
1592 fileno = (uint64_t)cntobn(pmp,
1593 pmp->pm_rootdirblk)
1594 * dirsperblk;
1595 else
1596 fileno = 1;
1597 if (pmp->pm_flags & MSDOSFS_LARGEFS) {
1598 dirbuf.d_fileno =
1599 msdosfs_fileno_map(pmp->pm_mountp,
1600 fileno);
1601 } else {
1602
1603 dirbuf.d_fileno = (uint32_t)fileno;
1604 }
1605 dirbuf.d_type = DT_DIR;
1606 switch (n) {
1607 case 0:
1608 dirbuf.d_namlen = 1;
1609 strcpy(dirbuf.d_name, ".");
1610 break;
1611 case 1:
1612 dirbuf.d_namlen = 2;
1613 strcpy(dirbuf.d_name, "..");
1614 break;
1615 }
1616 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf);
1617 if (uio->uio_resid < dirbuf.d_reclen)
1618 goto out;
1619 error = uiomove(&dirbuf, dirbuf.d_reclen, uio);
1620 if (error)
1621 goto out;
1622 offset += sizeof(struct direntry);
1623 off = offset;
1624 if (cookies) {
1625 *cookies++ = offset;
1626 if (--ncookies <= 0)
1627 goto out;
1628 }
1629 }
1630 }
1631 }
1632
1633 mbnambuf_init(&nb);
1634 off = offset;
1635 while (uio->uio_resid > 0) {
1636 lbn = de_cluster(pmp, offset - bias);
1637 on = (offset - bias) & pmp->pm_crbomask;
1638 n = min(pmp->pm_bpcluster - on, uio->uio_resid);
1639 diff = dep->de_FileSize - (offset - bias);
1640 if (diff <= 0)
1641 break;
1642 n = min(n, diff);
1643 error = pcbmap(dep, lbn, &bn, &cn, &blsize);
1644 if (error)
1645 break;
1646 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp);
1647 if (error) {
1648 brelse(bp);
1649 return (error);
1650 }
1651 n = min(n, blsize - bp->b_resid);
1652 if (n == 0) {
1653 brelse(bp);
1654 return (EIO);
1655 }
1656
1657 /*
1658 * Convert from dos directory entries to fs-independent
1659 * directory entries.
1660 */
1661 for (dentp = (struct direntry *)(bp->b_data + on);
1662 (char *)dentp < bp->b_data + on + n;
1663 dentp++, offset += sizeof(struct direntry)) {
1664 #if 0
1665 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n",
1666 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes);
1667 #endif
1668 /*
1669 * If this is an unused entry, we can stop.
1670 */
1671 if (dentp->deName[0] == SLOT_EMPTY) {
1672 brelse(bp);
1673 goto out;
1674 }
1675 /*
1676 * Skip deleted entries.
1677 */
1678 if (dentp->deName[0] == SLOT_DELETED) {
1679 chksum = -1;
1680 mbnambuf_init(&nb);
1681 continue;
1682 }
1683
1684 /*
1685 * Handle Win95 long directory entries
1686 */
1687 if (dentp->deAttributes == ATTR_WIN95) {
1688 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME)
1689 continue;
1690 chksum = win2unixfn(&nb,
1691 (struct winentry *)dentp, chksum, pmp);
1692 continue;
1693 }
1694
1695 /*
1696 * Skip volume labels
1697 */
1698 if (dentp->deAttributes & ATTR_VOLUME) {
1699 chksum = -1;
1700 mbnambuf_init(&nb);
1701 continue;
1702 }
1703 /*
1704 * This computation of d_fileno must match
1705 * the computation of va_fileid in
1706 * msdosfs_getattr.
1707 */
1708 if (dentp->deAttributes & ATTR_DIRECTORY) {
1709 fileno = getushort(dentp->deStartCluster);
1710 if (FAT32(pmp))
1711 fileno |= getushort(dentp->deHighClust) << 16;
1712 /* if this is the root directory */
1713 if (fileno == MSDOSFSROOT)
1714 if (FAT32(pmp))
1715 fileno = (uint64_t)cntobn(pmp,
1716 pmp->pm_rootdirblk)
1717 * dirsperblk;
1718 else
1719 fileno = 1;
1720 else
1721 fileno = (uint64_t)cntobn(pmp, fileno) *
1722 dirsperblk;
1723 dirbuf.d_type = DT_DIR;
1724 } else {
1725 fileno = (uoff_t)offset /
1726 sizeof(struct direntry);
1727 dirbuf.d_type = DT_REG;
1728 }
1729 if (pmp->pm_flags & MSDOSFS_LARGEFS) {
1730 dirbuf.d_fileno =
1731 msdosfs_fileno_map(pmp->pm_mountp, fileno);
1732 } else
1733 dirbuf.d_fileno = (uint32_t)fileno;
1734
1735 if (chksum != winChksum(dentp->deName)) {
1736 dirbuf.d_namlen = dos2unixfn(dentp->deName,
1737 (u_char *)dirbuf.d_name,
1738 dentp->deLowerCase |
1739 ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ?
1740 (LCASE_BASE | LCASE_EXT) : 0),
1741 pmp);
1742 mbnambuf_init(&nb);
1743 } else
1744 mbnambuf_flush(&nb, &dirbuf);
1745 chksum = -1;
1746 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf);
1747 if (uio->uio_resid < dirbuf.d_reclen) {
1748 brelse(bp);
1749 goto out;
1750 }
1751 error = uiomove(&dirbuf, dirbuf.d_reclen, uio);
1752 if (error) {
1753 brelse(bp);
1754 goto out;
1755 }
1756 if (cookies) {
1757 *cookies++ = offset + sizeof(struct direntry);
1758 if (--ncookies <= 0) {
1759 brelse(bp);
1760 goto out;
1761 }
1762 }
1763 off = offset + sizeof(struct direntry);
1764 }
1765 brelse(bp);
1766 }
1767 out:
1768 /* Subtract unused cookies */
1769 if (ap->a_ncookies)
1770 *ap->a_ncookies -= ncookies;
1771
1772 uio->uio_offset = off;
1773
1774 /*
1775 * Set the eofflag (NFS uses it)
1776 */
1777 if (ap->a_eofflag) {
1778 if (dep->de_FileSize - (offset - bias) <= 0)
1779 *ap->a_eofflag = 1;
1780 else
1781 *ap->a_eofflag = 0;
1782 }
1783 return (error);
1784 }
1785
1786 /*-
1787 * a_vp - pointer to the file's vnode
1788 * a_bn - logical block number within the file (cluster number for us)
1789 * a_bop - where to return the bufobj of the special file containing the fs
1790 * a_bnp - where to return the "physical" block number corresponding to a_bn
1791 * (relative to the special file; units are blocks of size DEV_BSIZE)
1792 * a_runp - where to return the "run past" a_bn. This is the count of logical
1793 * blocks whose physical blocks (together with a_bn's physical block)
1794 * are contiguous.
1795 * a_runb - where to return the "run before" a_bn.
1796 */
1797 static int
1798 msdosfs_bmap(ap)
1799 struct vop_bmap_args /* {
1800 struct vnode *a_vp;
1801 daddr_t a_bn;
1802 struct bufobj **a_bop;
1803 daddr_t *a_bnp;
1804 int *a_runp;
1805 int *a_runb;
1806 } */ *ap;
1807 {
1808 struct denode *dep;
1809 struct mount *mp;
1810 struct msdosfsmount *pmp;
1811 struct vnode *vp;
1812 daddr_t runbn;
1813 u_long cn;
1814 int bnpercn, error, maxio, maxrun, run;
1815
1816 vp = ap->a_vp;
1817 dep = VTODE(vp);
1818 pmp = dep->de_pmp;
1819 if (ap->a_bop != NULL)
1820 *ap->a_bop = &pmp->pm_devvp->v_bufobj;
1821 if (ap->a_bnp == NULL)
1822 return (0);
1823 if (ap->a_runp != NULL)
1824 *ap->a_runp = 0;
1825 if (ap->a_runb != NULL)
1826 *ap->a_runb = 0;
1827 cn = ap->a_bn;
1828 if (cn != ap->a_bn)
1829 return (EFBIG);
1830 error = pcbmap(dep, cn, ap->a_bnp, NULL, NULL);
1831 if (error != 0 || (ap->a_runp == NULL && ap->a_runb == NULL))
1832 return (error);
1833
1834 mp = vp->v_mount;
1835 maxio = mp->mnt_iosize_max / mp->mnt_stat.f_iosize;
1836 bnpercn = de_cn2bn(pmp, 1);
1837 if (ap->a_runp != NULL) {
1838 maxrun = ulmin(maxio - 1, pmp->pm_maxcluster - cn);
1839 for (run = 1; run <= maxrun; run++) {
1840 if (pcbmap(dep, cn + run, &runbn, NULL, NULL) != 0 ||
1841 runbn != *ap->a_bnp + run * bnpercn)
1842 break;
1843 }
1844 *ap->a_runp = run - 1;
1845 }
1846 if (ap->a_runb != NULL) {
1847 maxrun = ulmin(maxio - 1, cn);
1848 for (run = 1; run < maxrun; run++) {
1849 if (pcbmap(dep, cn - run, &runbn, NULL, NULL) != 0 ||
1850 runbn != *ap->a_bnp - run * bnpercn)
1851 break;
1852 }
1853 *ap->a_runb = run - 1;
1854 }
1855 return (0);
1856 }
1857
1858 static int
1859 msdosfs_strategy(ap)
1860 struct vop_strategy_args /* {
1861 struct vnode *a_vp;
1862 struct buf *a_bp;
1863 } */ *ap;
1864 {
1865 struct buf *bp = ap->a_bp;
1866 struct denode *dep = VTODE(ap->a_vp);
1867 struct bufobj *bo;
1868 int error = 0;
1869 daddr_t blkno;
1870
1871 /*
1872 * If we don't already know the filesystem relative block number
1873 * then get it using pcbmap(). If pcbmap() returns the block
1874 * number as -1 then we've got a hole in the file. DOS filesystems
1875 * don't allow files with holes, so we shouldn't ever see this.
1876 */
1877 if (bp->b_blkno == bp->b_lblkno) {
1878 error = pcbmap(dep, bp->b_lblkno, &blkno, 0, 0);
1879 bp->b_blkno = blkno;
1880 if (error) {
1881 bp->b_error = error;
1882 bp->b_ioflags |= BIO_ERROR;
1883 bufdone(bp);
1884 return (0);
1885 }
1886 if ((long)bp->b_blkno == -1)
1887 vfs_bio_clrbuf(bp);
1888 }
1889 if (bp->b_blkno == -1) {
1890 bufdone(bp);
1891 return (0);
1892 }
1893 /*
1894 * Read/write the block from/to the disk that contains the desired
1895 * file block.
1896 */
1897 bp->b_iooffset = dbtob(bp->b_blkno);
1898 bo = dep->de_pmp->pm_bo;
1899 BO_STRATEGY(bo, bp);
1900 return (0);
1901 }
1902
1903 static int
1904 msdosfs_print(ap)
1905 struct vop_print_args /* {
1906 struct vnode *vp;
1907 } */ *ap;
1908 {
1909 struct denode *dep = VTODE(ap->a_vp);
1910
1911 printf("\tstartcluster %lu, dircluster %lu, diroffset %lu, ",
1912 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset);
1913 printf("on dev %s\n", devtoname(dep->de_pmp->pm_dev));
1914 return (0);
1915 }
1916
1917 static int
1918 msdosfs_pathconf(ap)
1919 struct vop_pathconf_args /* {
1920 struct vnode *a_vp;
1921 int a_name;
1922 int *a_retval;
1923 } */ *ap;
1924 {
1925 struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp;
1926
1927 switch (ap->a_name) {
1928 case _PC_LINK_MAX:
1929 *ap->a_retval = 1;
1930 return (0);
1931 case _PC_NAME_MAX:
1932 *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12;
1933 return (0);
1934 case _PC_PATH_MAX:
1935 *ap->a_retval = PATH_MAX;
1936 return (0);
1937 case _PC_CHOWN_RESTRICTED:
1938 *ap->a_retval = 1;
1939 return (0);
1940 case _PC_NO_TRUNC:
1941 *ap->a_retval = 0;
1942 return (0);
1943 default:
1944 return (EINVAL);
1945 }
1946 /* NOTREACHED */
1947 }
1948
1949 static int
1950 msdosfs_vptofh(ap)
1951 struct vop_vptofh_args /* {
1952 struct vnode *a_vp;
1953 struct fid *a_fhp;
1954 } */ *ap;
1955 {
1956 struct denode *dep;
1957 struct defid *defhp;
1958
1959 dep = VTODE(ap->a_vp);
1960 defhp = (struct defid *)ap->a_fhp;
1961 defhp->defid_len = sizeof(struct defid);
1962 defhp->defid_dirclust = dep->de_dirclust;
1963 defhp->defid_dirofs = dep->de_diroffset;
1964 /* defhp->defid_gen = dep->de_gen; */
1965 return (0);
1966 }
1967
1968 /* Global vfs data structures for msdosfs */
1969 struct vop_vector msdosfs_vnodeops = {
1970 .vop_default = &default_vnodeops,
1971
1972 .vop_access = msdosfs_access,
1973 .vop_bmap = msdosfs_bmap,
1974 .vop_cachedlookup = msdosfs_lookup,
1975 .vop_open = msdosfs_open,
1976 .vop_close = msdosfs_close,
1977 .vop_create = msdosfs_create,
1978 .vop_fsync = msdosfs_fsync,
1979 .vop_getattr = msdosfs_getattr,
1980 .vop_inactive = msdosfs_inactive,
1981 .vop_link = msdosfs_link,
1982 .vop_lookup = vfs_cache_lookup,
1983 .vop_mkdir = msdosfs_mkdir,
1984 .vop_mknod = msdosfs_mknod,
1985 .vop_pathconf = msdosfs_pathconf,
1986 .vop_print = msdosfs_print,
1987 .vop_read = msdosfs_read,
1988 .vop_readdir = msdosfs_readdir,
1989 .vop_reclaim = msdosfs_reclaim,
1990 .vop_remove = msdosfs_remove,
1991 .vop_rename = msdosfs_rename,
1992 .vop_rmdir = msdosfs_rmdir,
1993 .vop_setattr = msdosfs_setattr,
1994 .vop_strategy = msdosfs_strategy,
1995 .vop_symlink = msdosfs_symlink,
1996 .vop_write = msdosfs_write,
1997 .vop_vptofh = msdosfs_vptofh,
1998 };
Cache object: 05a4027ee04081721d4818e5a252a578
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