1 /* $FreeBSD: releng/10.0/sys/fs/msdosfs/msdosfs_vnops.c 254627 2013-08-21 23:04:48Z ken $ */
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 = ATTR_ARCHIVE;
176 ndirent.de_LowerCase = 0;
177 ndirent.de_StartCluster = 0;
178 ndirent.de_FileSize = 0;
179 ndirent.de_pmp = pdep->de_pmp;
180 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE;
181 getnanotime(&ts);
182 DETIMES(&ndirent, &ts, &ts, &ts);
183 error = createde(&ndirent, pdep, &dep, cnp);
184 if (error)
185 goto bad;
186 *ap->a_vpp = DETOV(dep);
187 return (0);
188
189 bad:
190 return (error);
191 }
192
193 static int
194 msdosfs_mknod(ap)
195 struct vop_mknod_args /* {
196 struct vnode *a_dvp;
197 struct vnode **a_vpp;
198 struct componentname *a_cnp;
199 struct vattr *a_vap;
200 } */ *ap;
201 {
202
203 return (EINVAL);
204 }
205
206 static int
207 msdosfs_open(ap)
208 struct vop_open_args /* {
209 struct vnode *a_vp;
210 int a_mode;
211 struct ucred *a_cred;
212 struct thread *a_td;
213 struct file *a_fp;
214 } */ *ap;
215 {
216 struct denode *dep = VTODE(ap->a_vp);
217 vnode_create_vobject(ap->a_vp, dep->de_FileSize, ap->a_td);
218 return 0;
219 }
220
221 static int
222 msdosfs_close(ap)
223 struct vop_close_args /* {
224 struct vnode *a_vp;
225 int a_fflag;
226 struct ucred *a_cred;
227 struct thread *a_td;
228 } */ *ap;
229 {
230 struct vnode *vp = ap->a_vp;
231 struct denode *dep = VTODE(vp);
232 struct timespec ts;
233
234 VI_LOCK(vp);
235 if (vp->v_usecount > 1) {
236 getnanotime(&ts);
237 DETIMES(dep, &ts, &ts, &ts);
238 }
239 VI_UNLOCK(vp);
240 return 0;
241 }
242
243 static int
244 msdosfs_access(ap)
245 struct vop_access_args /* {
246 struct vnode *a_vp;
247 accmode_t a_accmode;
248 struct ucred *a_cred;
249 struct thread *a_td;
250 } */ *ap;
251 {
252 struct vnode *vp = ap->a_vp;
253 struct denode *dep = VTODE(ap->a_vp);
254 struct msdosfsmount *pmp = dep->de_pmp;
255 mode_t file_mode;
256 accmode_t accmode = ap->a_accmode;
257
258 file_mode = S_IRWXU|S_IRWXG|S_IRWXO;
259 file_mode &= (vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask);
260
261 /*
262 * Disallow writing to directories and regular files if the
263 * filesystem is read-only.
264 */
265 if (accmode & VWRITE) {
266 switch (vp->v_type) {
267 case VREG:
268 case VDIR:
269 if (vp->v_mount->mnt_flag & MNT_RDONLY)
270 return (EROFS);
271 break;
272 default:
273 break;
274 }
275 }
276
277 return (vaccess(vp->v_type, file_mode, pmp->pm_uid, pmp->pm_gid,
278 ap->a_accmode, ap->a_cred, NULL));
279 }
280
281 static int
282 msdosfs_getattr(ap)
283 struct vop_getattr_args /* {
284 struct vnode *a_vp;
285 struct vattr *a_vap;
286 struct ucred *a_cred;
287 } */ *ap;
288 {
289 struct denode *dep = VTODE(ap->a_vp);
290 struct msdosfsmount *pmp = dep->de_pmp;
291 struct vattr *vap = ap->a_vap;
292 mode_t mode;
293 struct timespec ts;
294 u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry);
295 uint64_t fileid;
296
297 getnanotime(&ts);
298 DETIMES(dep, &ts, &ts, &ts);
299 vap->va_fsid = dev2udev(pmp->pm_dev);
300 /*
301 * The following computation of the fileid must be the same as that
302 * used in msdosfs_readdir() to compute d_fileno. If not, pwd
303 * doesn't work.
304 */
305 if (dep->de_Attributes & ATTR_DIRECTORY) {
306 fileid = (uint64_t)cntobn(pmp, dep->de_StartCluster) *
307 dirsperblk;
308 if (dep->de_StartCluster == MSDOSFSROOT)
309 fileid = 1;
310 } else {
311 fileid = (uint64_t)cntobn(pmp, dep->de_dirclust) *
312 dirsperblk;
313 if (dep->de_dirclust == MSDOSFSROOT)
314 fileid = (uint64_t)roottobn(pmp, 0) * dirsperblk;
315 fileid += (uoff_t)dep->de_diroffset / sizeof(struct direntry);
316 }
317
318 if (pmp->pm_flags & MSDOSFS_LARGEFS)
319 vap->va_fileid = msdosfs_fileno_map(pmp->pm_mountp, fileid);
320 else
321 vap->va_fileid = (long)fileid;
322
323 mode = S_IRWXU|S_IRWXG|S_IRWXO;
324 vap->va_mode = mode &
325 (ap->a_vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask);
326 vap->va_uid = pmp->pm_uid;
327 vap->va_gid = pmp->pm_gid;
328 vap->va_nlink = 1;
329 vap->va_rdev = NODEV;
330 vap->va_size = dep->de_FileSize;
331 fattime2timespec(dep->de_MDate, dep->de_MTime, 0, 0, &vap->va_mtime);
332 vap->va_ctime = vap->va_mtime;
333 if (pmp->pm_flags & MSDOSFSMNT_LONGNAME) {
334 fattime2timespec(dep->de_ADate, 0, 0, 0, &vap->va_atime);
335 fattime2timespec(dep->de_CDate, dep->de_CTime, dep->de_CHun,
336 0, &vap->va_birthtime);
337 } else {
338 vap->va_atime = vap->va_mtime;
339 vap->va_birthtime.tv_sec = -1;
340 vap->va_birthtime.tv_nsec = 0;
341 }
342 vap->va_flags = 0;
343 if (dep->de_Attributes & ATTR_ARCHIVE)
344 vap->va_flags |= UF_ARCHIVE;
345 if (dep->de_Attributes & ATTR_HIDDEN)
346 vap->va_flags |= UF_HIDDEN;
347 if (dep->de_Attributes & ATTR_READONLY)
348 vap->va_flags |= UF_READONLY;
349 if (dep->de_Attributes & ATTR_SYSTEM)
350 vap->va_flags |= UF_SYSTEM;
351 vap->va_gen = 0;
352 vap->va_blocksize = pmp->pm_bpcluster;
353 vap->va_bytes =
354 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask;
355 vap->va_type = ap->a_vp->v_type;
356 vap->va_filerev = dep->de_modrev;
357 return (0);
358 }
359
360 static int
361 msdosfs_setattr(ap)
362 struct vop_setattr_args /* {
363 struct vnode *a_vp;
364 struct vattr *a_vap;
365 struct ucred *a_cred;
366 } */ *ap;
367 {
368 struct vnode *vp = ap->a_vp;
369 struct denode *dep = VTODE(ap->a_vp);
370 struct msdosfsmount *pmp = dep->de_pmp;
371 struct vattr *vap = ap->a_vap;
372 struct ucred *cred = ap->a_cred;
373 struct thread *td = curthread;
374 int error = 0;
375
376 #ifdef MSDOSFS_DEBUG
377 printf("msdosfs_setattr(): vp %p, vap %p, cred %p\n",
378 ap->a_vp, vap, cred);
379 #endif
380
381 /*
382 * Check for unsettable attributes.
383 */
384 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
385 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
386 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
387 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
388 #ifdef MSDOSFS_DEBUG
389 printf("msdosfs_setattr(): returning EINVAL\n");
390 printf(" va_type %d, va_nlink %x, va_fsid %lx, va_fileid %lx\n",
391 vap->va_type, vap->va_nlink, vap->va_fsid, vap->va_fileid);
392 printf(" va_blocksize %lx, va_rdev %x, va_bytes %qx, va_gen %lx\n",
393 vap->va_blocksize, vap->va_rdev, vap->va_bytes, vap->va_gen);
394 printf(" va_uid %x, va_gid %x\n",
395 vap->va_uid, vap->va_gid);
396 #endif
397 return (EINVAL);
398 }
399
400 /*
401 * We don't allow setting attributes on the root directory.
402 * The special case for the root directory is because before
403 * FAT32, the root directory didn't have an entry for itself
404 * (and was otherwise special). With FAT32, the root
405 * directory is not so special, but still doesn't have an
406 * entry for itself.
407 */
408 if (vp->v_vflag & VV_ROOT)
409 return (EINVAL);
410
411 if (vap->va_flags != VNOVAL) {
412 if (vp->v_mount->mnt_flag & MNT_RDONLY)
413 return (EROFS);
414 if (cred->cr_uid != pmp->pm_uid) {
415 error = priv_check_cred(cred, PRIV_VFS_ADMIN, 0);
416 if (error)
417 return (error);
418 }
419 /*
420 * We are very inconsistent about handling unsupported
421 * attributes. We ignored the access time and the
422 * read and execute bits. We were strict for the other
423 * attributes.
424 */
425 if (vap->va_flags & ~(UF_ARCHIVE | UF_HIDDEN | UF_READONLY |
426 UF_SYSTEM))
427 return EOPNOTSUPP;
428 if (vap->va_flags & UF_ARCHIVE)
429 dep->de_Attributes |= ATTR_ARCHIVE;
430 else
431 dep->de_Attributes &= ~ATTR_ARCHIVE;
432 if (vap->va_flags & UF_HIDDEN)
433 dep->de_Attributes |= ATTR_HIDDEN;
434 else
435 dep->de_Attributes &= ~ATTR_HIDDEN;
436 /* We don't allow changing the readonly bit on directories. */
437 if (vp->v_type != VDIR) {
438 if (vap->va_flags & UF_READONLY)
439 dep->de_Attributes |= ATTR_READONLY;
440 else
441 dep->de_Attributes &= ~ATTR_READONLY;
442 }
443 if (vap->va_flags & UF_SYSTEM)
444 dep->de_Attributes |= ATTR_SYSTEM;
445 else
446 dep->de_Attributes &= ~ATTR_SYSTEM;
447 dep->de_flag |= DE_MODIFIED;
448 }
449
450 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
451 uid_t uid;
452 gid_t gid;
453
454 if (vp->v_mount->mnt_flag & MNT_RDONLY)
455 return (EROFS);
456 uid = vap->va_uid;
457 if (uid == (uid_t)VNOVAL)
458 uid = pmp->pm_uid;
459 gid = vap->va_gid;
460 if (gid == (gid_t)VNOVAL)
461 gid = pmp->pm_gid;
462 if (cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid ||
463 (gid != pmp->pm_gid && !groupmember(gid, cred))) {
464 error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0);
465 if (error)
466 return (error);
467 }
468 if (uid != pmp->pm_uid || gid != pmp->pm_gid)
469 return EINVAL;
470 }
471
472 if (vap->va_size != VNOVAL) {
473 switch (vp->v_type) {
474 case VDIR:
475 return (EISDIR);
476 case VREG:
477 /*
478 * Truncation is only supported for regular files,
479 * Disallow it if the filesystem is read-only.
480 */
481 if (vp->v_mount->mnt_flag & MNT_RDONLY)
482 return (EROFS);
483 break;
484 default:
485 /*
486 * According to POSIX, the result is unspecified
487 * for file types other than regular files,
488 * directories and shared memory objects. We
489 * don't support any file types except regular
490 * files and directories in this file system, so
491 * this (default) case is unreachable and can do
492 * anything. Keep falling through to detrunc()
493 * for now.
494 */
495 break;
496 }
497 error = detrunc(dep, vap->va_size, 0, cred);
498 if (error)
499 return error;
500 }
501 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
502 if (vp->v_mount->mnt_flag & MNT_RDONLY)
503 return (EROFS);
504 if (vap->va_vaflags & VA_UTIMES_NULL) {
505 error = VOP_ACCESS(vp, VADMIN, cred, td);
506 if (error)
507 error = VOP_ACCESS(vp, VWRITE, cred, td);
508 } else
509 error = VOP_ACCESS(vp, VADMIN, cred, td);
510 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 &&
511 vap->va_atime.tv_sec != VNOVAL) {
512 dep->de_flag &= ~DE_ACCESS;
513 timespec2fattime(&vap->va_atime, 0,
514 &dep->de_ADate, NULL, NULL);
515 }
516 if (vap->va_mtime.tv_sec != VNOVAL) {
517 dep->de_flag &= ~DE_UPDATE;
518 timespec2fattime(&vap->va_mtime, 0,
519 &dep->de_MDate, &dep->de_MTime, NULL);
520 }
521 /*
522 * We don't set the archive bit when modifying the time of
523 * a directory to emulate the Windows/DOS behavior.
524 */
525 if (vp->v_type != VDIR)
526 dep->de_Attributes |= ATTR_ARCHIVE;
527 dep->de_flag |= DE_MODIFIED;
528 }
529 /*
530 * DOS files only have the ability to have their writability
531 * attribute set, so we use the owner write bit to set the readonly
532 * attribute.
533 */
534 if (vap->va_mode != (mode_t)VNOVAL) {
535 if (vp->v_mount->mnt_flag & MNT_RDONLY)
536 return (EROFS);
537 if (cred->cr_uid != pmp->pm_uid) {
538 error = priv_check_cred(cred, PRIV_VFS_ADMIN, 0);
539 if (error)
540 return (error);
541 }
542 if (vp->v_type != VDIR) {
543 /* We ignore the read and execute bits. */
544 if (vap->va_mode & VWRITE)
545 dep->de_Attributes &= ~ATTR_READONLY;
546 else
547 dep->de_Attributes |= ATTR_READONLY;
548 dep->de_Attributes |= ATTR_ARCHIVE;
549 dep->de_flag |= DE_MODIFIED;
550 }
551 }
552 return (deupdat(dep, 0));
553 }
554
555 static int
556 msdosfs_read(ap)
557 struct vop_read_args /* {
558 struct vnode *a_vp;
559 struct uio *a_uio;
560 int a_ioflag;
561 struct ucred *a_cred;
562 } */ *ap;
563 {
564 int error = 0;
565 int blsize;
566 int isadir;
567 ssize_t orig_resid;
568 u_int n;
569 u_long diff;
570 u_long on;
571 daddr_t lbn;
572 daddr_t rablock;
573 int rasize;
574 int seqcount;
575 struct buf *bp;
576 struct vnode *vp = ap->a_vp;
577 struct denode *dep = VTODE(vp);
578 struct msdosfsmount *pmp = dep->de_pmp;
579 struct uio *uio = ap->a_uio;
580
581 /*
582 * If they didn't ask for any data, then we are done.
583 */
584 orig_resid = uio->uio_resid;
585 if (orig_resid == 0)
586 return (0);
587
588 /*
589 * The caller is supposed to ensure that
590 * uio->uio_offset >= 0 and uio->uio_resid >= 0.
591 * We don't need to check for large offsets as in ffs because
592 * dep->de_FileSize <= DOS_FILESIZE_MAX < OFF_MAX, so large
593 * offsets cannot cause overflow even in theory.
594 */
595
596 seqcount = ap->a_ioflag >> IO_SEQSHIFT;
597
598 isadir = dep->de_Attributes & ATTR_DIRECTORY;
599 do {
600 if (uio->uio_offset >= dep->de_FileSize)
601 break;
602 lbn = de_cluster(pmp, uio->uio_offset);
603 rablock = lbn + 1;
604 blsize = pmp->pm_bpcluster;
605 on = uio->uio_offset & pmp->pm_crbomask;
606 /*
607 * If we are operating on a directory file then be sure to
608 * do i/o with the vnode for the filesystem instead of the
609 * vnode for the directory.
610 */
611 if (isadir) {
612 /* convert cluster # to block # */
613 error = pcbmap(dep, lbn, &lbn, 0, &blsize);
614 if (error == E2BIG) {
615 error = EINVAL;
616 break;
617 } else if (error)
618 break;
619 error = bread(pmp->pm_devvp, lbn, blsize, NOCRED, &bp);
620 } else if (de_cn2off(pmp, rablock) >= dep->de_FileSize) {
621 error = bread(vp, lbn, blsize, NOCRED, &bp);
622 } else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) {
623 error = cluster_read(vp, dep->de_FileSize, lbn, blsize,
624 NOCRED, on + uio->uio_resid, seqcount, 0, &bp);
625 } else if (seqcount > 1) {
626 rasize = blsize;
627 error = breadn(vp, lbn,
628 blsize, &rablock, &rasize, 1, NOCRED, &bp);
629 } else {
630 error = bread(vp, lbn, blsize, NOCRED, &bp);
631 }
632 if (error) {
633 brelse(bp);
634 break;
635 }
636 diff = pmp->pm_bpcluster - on;
637 n = diff > uio->uio_resid ? uio->uio_resid : diff;
638 diff = dep->de_FileSize - uio->uio_offset;
639 if (diff < n)
640 n = diff;
641 diff = blsize - bp->b_resid;
642 if (diff < n)
643 n = diff;
644 error = uiomove(bp->b_data + on, (int) n, uio);
645 brelse(bp);
646 } while (error == 0 && uio->uio_resid > 0 && n != 0);
647 if (!isadir && (error == 0 || uio->uio_resid != orig_resid) &&
648 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0)
649 dep->de_flag |= DE_ACCESS;
650 return (error);
651 }
652
653 /*
654 * Write data to a file or directory.
655 */
656 static int
657 msdosfs_write(ap)
658 struct vop_write_args /* {
659 struct vnode *a_vp;
660 struct uio *a_uio;
661 int a_ioflag;
662 struct ucred *a_cred;
663 } */ *ap;
664 {
665 int n;
666 int croffset;
667 ssize_t resid;
668 u_long osize;
669 int error = 0;
670 u_long count;
671 int seqcount;
672 daddr_t bn, lastcn;
673 struct buf *bp;
674 int ioflag = ap->a_ioflag;
675 struct uio *uio = ap->a_uio;
676 struct vnode *vp = ap->a_vp;
677 struct vnode *thisvp;
678 struct denode *dep = VTODE(vp);
679 struct msdosfsmount *pmp = dep->de_pmp;
680 struct ucred *cred = ap->a_cred;
681
682 #ifdef MSDOSFS_DEBUG
683 printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n",
684 vp, uio, ioflag, cred);
685 printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n",
686 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster);
687 #endif
688
689 switch (vp->v_type) {
690 case VREG:
691 if (ioflag & IO_APPEND)
692 uio->uio_offset = dep->de_FileSize;
693 thisvp = vp;
694 break;
695 case VDIR:
696 return EISDIR;
697 default:
698 panic("msdosfs_write(): bad file type");
699 }
700
701 /*
702 * This is needed (unlike in ffs_write()) because we extend the
703 * file outside of the loop but we don't want to extend the file
704 * for writes of 0 bytes.
705 */
706 if (uio->uio_resid == 0)
707 return (0);
708
709 /*
710 * The caller is supposed to ensure that
711 * uio->uio_offset >= 0 and uio->uio_resid >= 0.
712 */
713 if ((uoff_t)uio->uio_offset + uio->uio_resid > DOS_FILESIZE_MAX)
714 return (EFBIG);
715
716 /*
717 * If they've exceeded their filesize limit, tell them about it.
718 */
719 if (vn_rlimit_fsize(vp, uio, uio->uio_td))
720 return (EFBIG);
721
722 /*
723 * If the offset we are starting the write at is beyond the end of
724 * the file, then they've done a seek. Unix filesystems allow
725 * files with holes in them, DOS doesn't so we must fill the hole
726 * with zeroed blocks.
727 */
728 if (uio->uio_offset > dep->de_FileSize) {
729 error = deextend(dep, uio->uio_offset, cred);
730 if (error)
731 return (error);
732 }
733
734 /*
735 * Remember some values in case the write fails.
736 */
737 resid = uio->uio_resid;
738 osize = dep->de_FileSize;
739
740 /*
741 * If we write beyond the end of the file, extend it to its ultimate
742 * size ahead of the time to hopefully get a contiguous area.
743 */
744 if (uio->uio_offset + resid > osize) {
745 count = de_clcount(pmp, uio->uio_offset + resid) -
746 de_clcount(pmp, osize);
747 error = extendfile(dep, count, NULL, NULL, 0);
748 if (error && (error != ENOSPC || (ioflag & IO_UNIT)))
749 goto errexit;
750 lastcn = dep->de_fc[FC_LASTFC].fc_frcn;
751 } else
752 lastcn = de_clcount(pmp, osize) - 1;
753
754 seqcount = ioflag >> IO_SEQSHIFT;
755 do {
756 if (de_cluster(pmp, uio->uio_offset) > lastcn) {
757 error = ENOSPC;
758 break;
759 }
760
761 croffset = uio->uio_offset & pmp->pm_crbomask;
762 n = min(uio->uio_resid, pmp->pm_bpcluster - croffset);
763 if (uio->uio_offset + n > dep->de_FileSize) {
764 dep->de_FileSize = uio->uio_offset + n;
765 /* The object size needs to be set before buffer is allocated */
766 vnode_pager_setsize(vp, dep->de_FileSize);
767 }
768
769 bn = de_cluster(pmp, uio->uio_offset);
770 if ((uio->uio_offset & pmp->pm_crbomask) == 0
771 && (de_cluster(pmp, uio->uio_offset + uio->uio_resid)
772 > de_cluster(pmp, uio->uio_offset)
773 || uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) {
774 /*
775 * If either the whole cluster gets written,
776 * or we write the cluster from its start beyond EOF,
777 * then no need to read data from disk.
778 */
779 bp = getblk(thisvp, bn, pmp->pm_bpcluster, 0, 0, 0);
780 vfs_bio_clrbuf(bp);
781 /*
782 * Do the bmap now, since pcbmap needs buffers
783 * for the fat table. (see msdosfs_strategy)
784 */
785 if (bp->b_blkno == bp->b_lblkno) {
786 error = pcbmap(dep, bp->b_lblkno, &bn, 0, 0);
787 if (error)
788 bp->b_blkno = -1;
789 else
790 bp->b_blkno = bn;
791 }
792 if (bp->b_blkno == -1) {
793 brelse(bp);
794 if (!error)
795 error = EIO; /* XXX */
796 break;
797 }
798 } else {
799 /*
800 * The block we need to write into exists, so read it in.
801 */
802 error = bread(thisvp, bn, pmp->pm_bpcluster, cred, &bp);
803 if (error) {
804 brelse(bp);
805 break;
806 }
807 }
808
809 /*
810 * Should these vnode_pager_* functions be done on dir
811 * files?
812 */
813
814 /*
815 * Copy the data from user space into the buf header.
816 */
817 error = uiomove(bp->b_data + croffset, n, uio);
818 if (error) {
819 brelse(bp);
820 break;
821 }
822
823 /* Prepare for clustered writes in some else clauses. */
824 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0)
825 bp->b_flags |= B_CLUSTEROK;
826
827 /*
828 * If IO_SYNC, then each buffer is written synchronously.
829 * Otherwise, if we have a severe page deficiency then
830 * write the buffer asynchronously. Otherwise, if on a
831 * cluster boundary then write the buffer asynchronously,
832 * combining it with contiguous clusters if permitted and
833 * possible, since we don't expect more writes into this
834 * buffer soon. Otherwise, do a delayed write because we
835 * expect more writes into this buffer soon.
836 */
837 if (ioflag & IO_SYNC)
838 (void)bwrite(bp);
839 else if (vm_page_count_severe() || buf_dirty_count_severe())
840 bawrite(bp);
841 else if (n + croffset == pmp->pm_bpcluster) {
842 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0)
843 cluster_write(vp, bp, dep->de_FileSize,
844 seqcount, 0);
845 else
846 bawrite(bp);
847 } else
848 bdwrite(bp);
849 dep->de_flag |= DE_UPDATE;
850 } while (error == 0 && uio->uio_resid > 0);
851
852 /*
853 * If the write failed and they want us to, truncate the file back
854 * to the size it was before the write was attempted.
855 */
856 errexit:
857 if (error) {
858 if (ioflag & IO_UNIT) {
859 detrunc(dep, osize, ioflag & IO_SYNC, NOCRED);
860 uio->uio_offset -= resid - uio->uio_resid;
861 uio->uio_resid = resid;
862 } else {
863 detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC, NOCRED);
864 if (uio->uio_resid != resid)
865 error = 0;
866 }
867 } else if (ioflag & IO_SYNC)
868 error = deupdat(dep, 1);
869 return (error);
870 }
871
872 /*
873 * Flush the blocks of a file to disk.
874 */
875 static int
876 msdosfs_fsync(ap)
877 struct vop_fsync_args /* {
878 struct vnode *a_vp;
879 struct ucred *a_cred;
880 int a_waitfor;
881 struct thread *a_td;
882 } */ *ap;
883 {
884 struct vnode *devvp;
885 int allerror, error;
886
887 vop_stdfsync(ap);
888
889 /*
890 * If the syncing request comes from fsync(2), sync the entire
891 * FAT and any other metadata that happens to be on devvp. We
892 * need this mainly for the FAT. We write the FAT sloppily, and
893 * syncing it all now is the best we can easily do to get all
894 * directory entries associated with the file (not just the file)
895 * fully synced. The other metadata includes critical metadata
896 * for all directory entries, but only in the MNT_ASYNC case. We
897 * will soon sync all metadata in the file's directory entry.
898 * Non-critical metadata for associated directory entries only
899 * gets synced accidentally, as in most file systems.
900 */
901 if (ap->a_waitfor == MNT_WAIT) {
902 devvp = VTODE(ap->a_vp)->de_pmp->pm_devvp;
903 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
904 allerror = VOP_FSYNC(devvp, MNT_WAIT, ap->a_td);
905 VOP_UNLOCK(devvp, 0);
906 } else
907 allerror = 0;
908
909 error = deupdat(VTODE(ap->a_vp), ap->a_waitfor == MNT_WAIT);
910 if (allerror == 0)
911 allerror = error;
912 return (allerror);
913 }
914
915 static int
916 msdosfs_remove(ap)
917 struct vop_remove_args /* {
918 struct vnode *a_dvp;
919 struct vnode *a_vp;
920 struct componentname *a_cnp;
921 } */ *ap;
922 {
923 struct denode *dep = VTODE(ap->a_vp);
924 struct denode *ddep = VTODE(ap->a_dvp);
925 int error;
926
927 if (ap->a_vp->v_type == VDIR)
928 error = EPERM;
929 else
930 error = removede(ddep, dep);
931 #ifdef MSDOSFS_DEBUG
932 printf("msdosfs_remove(), dep %p, v_usecount %d\n", dep, ap->a_vp->v_usecount);
933 #endif
934 return (error);
935 }
936
937 /*
938 * DOS filesystems don't know what links are.
939 */
940 static int
941 msdosfs_link(ap)
942 struct vop_link_args /* {
943 struct vnode *a_tdvp;
944 struct vnode *a_vp;
945 struct componentname *a_cnp;
946 } */ *ap;
947 {
948 return (EOPNOTSUPP);
949 }
950
951 /*
952 * Renames on files require moving the denode to a new hash queue since the
953 * denode's location is used to compute which hash queue to put the file
954 * in. Unless it is a rename in place. For example "mv a b".
955 *
956 * What follows is the basic algorithm:
957 *
958 * if (file move) {
959 * if (dest file exists) {
960 * remove dest file
961 * }
962 * if (dest and src in same directory) {
963 * rewrite name in existing directory slot
964 * } else {
965 * write new entry in dest directory
966 * update offset and dirclust in denode
967 * move denode to new hash chain
968 * clear old directory entry
969 * }
970 * } else {
971 * directory move
972 * if (dest directory exists) {
973 * if (dest is not empty) {
974 * return ENOTEMPTY
975 * }
976 * remove dest directory
977 * }
978 * if (dest and src in same directory) {
979 * rewrite name in existing entry
980 * } else {
981 * be sure dest is not a child of src directory
982 * write entry in dest directory
983 * update "." and ".." in moved directory
984 * clear old directory entry for moved directory
985 * }
986 * }
987 *
988 * On entry:
989 * source's parent directory is unlocked
990 * source file or directory is unlocked
991 * destination's parent directory is locked
992 * destination file or directory is locked if it exists
993 *
994 * On exit:
995 * all denodes should be released
996 */
997 static int
998 msdosfs_rename(ap)
999 struct vop_rename_args /* {
1000 struct vnode *a_fdvp;
1001 struct vnode *a_fvp;
1002 struct componentname *a_fcnp;
1003 struct vnode *a_tdvp;
1004 struct vnode *a_tvp;
1005 struct componentname *a_tcnp;
1006 } */ *ap;
1007 {
1008 struct vnode *tdvp = ap->a_tdvp;
1009 struct vnode *fvp = ap->a_fvp;
1010 struct vnode *fdvp = ap->a_fdvp;
1011 struct vnode *tvp = ap->a_tvp;
1012 struct componentname *tcnp = ap->a_tcnp;
1013 struct componentname *fcnp = ap->a_fcnp;
1014 struct denode *ip, *xp, *dp, *zp;
1015 u_char toname[12], oldname[11];
1016 u_long from_diroffset, to_diroffset;
1017 u_char to_count;
1018 int doingdirectory = 0, newparent = 0;
1019 int error;
1020 u_long cn, pcl;
1021 daddr_t bn;
1022 struct denode *fddep; /* from file's parent directory */
1023 struct msdosfsmount *pmp;
1024 struct direntry *dotdotp;
1025 struct buf *bp;
1026
1027 fddep = VTODE(ap->a_fdvp);
1028 pmp = fddep->de_pmp;
1029
1030 pmp = VFSTOMSDOSFS(fdvp->v_mount);
1031
1032 #ifdef DIAGNOSTIC
1033 if ((tcnp->cn_flags & HASBUF) == 0 ||
1034 (fcnp->cn_flags & HASBUF) == 0)
1035 panic("msdosfs_rename: no name");
1036 #endif
1037 /*
1038 * Check for cross-device rename.
1039 */
1040 if (fvp->v_mount != tdvp->v_mount ||
1041 (tvp && fvp->v_mount != tvp->v_mount)) {
1042 error = EXDEV;
1043 abortit:
1044 if (tdvp == tvp)
1045 vrele(tdvp);
1046 else
1047 vput(tdvp);
1048 if (tvp)
1049 vput(tvp);
1050 vrele(fdvp);
1051 vrele(fvp);
1052 return (error);
1053 }
1054
1055 /*
1056 * If source and dest are the same, do nothing.
1057 */
1058 if (tvp == fvp) {
1059 error = 0;
1060 goto abortit;
1061 }
1062
1063 error = vn_lock(fvp, LK_EXCLUSIVE);
1064 if (error)
1065 goto abortit;
1066 dp = VTODE(fdvp);
1067 ip = VTODE(fvp);
1068
1069 /*
1070 * Be sure we are not renaming ".", "..", or an alias of ".". This
1071 * leads to a crippled directory tree. It's pretty tough to do a
1072 * "ls" or "pwd" with the "." directory entry missing, and "cd .."
1073 * doesn't work if the ".." entry is missing.
1074 */
1075 if (ip->de_Attributes & ATTR_DIRECTORY) {
1076 /*
1077 * Avoid ".", "..", and aliases of "." for obvious reasons.
1078 */
1079 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
1080 dp == ip ||
1081 (fcnp->cn_flags & ISDOTDOT) ||
1082 (tcnp->cn_flags & ISDOTDOT) ||
1083 (ip->de_flag & DE_RENAME)) {
1084 VOP_UNLOCK(fvp, 0);
1085 error = EINVAL;
1086 goto abortit;
1087 }
1088 ip->de_flag |= DE_RENAME;
1089 doingdirectory++;
1090 }
1091
1092 /*
1093 * When the target exists, both the directory
1094 * and target vnodes are returned locked.
1095 */
1096 dp = VTODE(tdvp);
1097 xp = tvp ? VTODE(tvp) : NULL;
1098 /*
1099 * Remember direntry place to use for destination
1100 */
1101 to_diroffset = dp->de_fndoffset;
1102 to_count = dp->de_fndcnt;
1103
1104 /*
1105 * If ".." must be changed (ie the directory gets a new
1106 * parent) then the source directory must not be in the
1107 * directory hierarchy above the target, as this would
1108 * orphan everything below the source directory. Also
1109 * the user must have write permission in the source so
1110 * as to be able to change "..". We must repeat the call
1111 * to namei, as the parent directory is unlocked by the
1112 * call to doscheckpath().
1113 */
1114 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread);
1115 VOP_UNLOCK(fvp, 0);
1116 if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster)
1117 newparent = 1;
1118 if (doingdirectory && newparent) {
1119 if (error) /* write access check above */
1120 goto bad;
1121 if (xp != NULL)
1122 vput(tvp);
1123 /*
1124 * doscheckpath() vput()'s dp,
1125 * so we have to do a relookup afterwards
1126 */
1127 error = doscheckpath(ip, dp);
1128 if (error)
1129 goto out;
1130 if ((tcnp->cn_flags & SAVESTART) == 0)
1131 panic("msdosfs_rename: lost to startdir");
1132 error = relookup(tdvp, &tvp, tcnp);
1133 if (error)
1134 goto out;
1135 dp = VTODE(tdvp);
1136 xp = tvp ? VTODE(tvp) : NULL;
1137 }
1138
1139 if (xp != NULL) {
1140 /*
1141 * Target must be empty if a directory and have no links
1142 * to it. Also, ensure source and target are compatible
1143 * (both directories, or both not directories).
1144 */
1145 if (xp->de_Attributes & ATTR_DIRECTORY) {
1146 if (!dosdirempty(xp)) {
1147 error = ENOTEMPTY;
1148 goto bad;
1149 }
1150 if (!doingdirectory) {
1151 error = ENOTDIR;
1152 goto bad;
1153 }
1154 cache_purge(tdvp);
1155 } else if (doingdirectory) {
1156 error = EISDIR;
1157 goto bad;
1158 }
1159 error = removede(dp, xp);
1160 if (error)
1161 goto bad;
1162 vput(tvp);
1163 xp = NULL;
1164 }
1165
1166 /*
1167 * Convert the filename in tcnp into a dos filename. We copy this
1168 * into the denode and directory entry for the destination
1169 * file/directory.
1170 */
1171 error = uniqdosname(VTODE(tdvp), tcnp, toname);
1172 if (error)
1173 goto abortit;
1174
1175 /*
1176 * Since from wasn't locked at various places above,
1177 * have to do a relookup here.
1178 */
1179 fcnp->cn_flags &= ~MODMASK;
1180 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
1181 if ((fcnp->cn_flags & SAVESTART) == 0)
1182 panic("msdosfs_rename: lost from startdir");
1183 if (!newparent)
1184 VOP_UNLOCK(tdvp, 0);
1185 if (relookup(fdvp, &fvp, fcnp) == 0)
1186 vrele(fdvp);
1187 if (fvp == NULL) {
1188 /*
1189 * From name has disappeared.
1190 */
1191 if (doingdirectory)
1192 panic("rename: lost dir entry");
1193 if (newparent)
1194 VOP_UNLOCK(tdvp, 0);
1195 vrele(tdvp);
1196 vrele(ap->a_fvp);
1197 return 0;
1198 }
1199 xp = VTODE(fvp);
1200 zp = VTODE(fdvp);
1201 from_diroffset = zp->de_fndoffset;
1202
1203 /*
1204 * Ensure that the directory entry still exists and has not
1205 * changed till now. If the source is a file the entry may
1206 * have been unlinked or renamed. In either case there is
1207 * no further work to be done. If the source is a directory
1208 * then it cannot have been rmdir'ed or renamed; this is
1209 * prohibited by the DE_RENAME flag.
1210 */
1211 if (xp != ip) {
1212 if (doingdirectory)
1213 panic("rename: lost dir entry");
1214 VOP_UNLOCK(fvp, 0);
1215 if (newparent)
1216 VOP_UNLOCK(fdvp, 0);
1217 vrele(ap->a_fvp);
1218 xp = NULL;
1219 } else {
1220 vrele(fvp);
1221 xp = NULL;
1222
1223 /*
1224 * First write a new entry in the destination
1225 * directory and mark the entry in the source directory
1226 * as deleted. Then move the denode to the correct hash
1227 * chain for its new location in the filesystem. And, if
1228 * we moved a directory, then update its .. entry to point
1229 * to the new parent directory.
1230 */
1231 bcopy(ip->de_Name, oldname, 11);
1232 bcopy(toname, ip->de_Name, 11); /* update denode */
1233 dp->de_fndoffset = to_diroffset;
1234 dp->de_fndcnt = to_count;
1235 error = createde(ip, dp, (struct denode **)0, tcnp);
1236 if (error) {
1237 bcopy(oldname, ip->de_Name, 11);
1238 if (newparent)
1239 VOP_UNLOCK(fdvp, 0);
1240 VOP_UNLOCK(fvp, 0);
1241 goto bad;
1242 }
1243 ip->de_refcnt++;
1244 zp->de_fndoffset = from_diroffset;
1245 error = removede(zp, ip);
1246 if (error) {
1247 /* XXX should downgrade to ro here, fs is corrupt */
1248 if (newparent)
1249 VOP_UNLOCK(fdvp, 0);
1250 VOP_UNLOCK(fvp, 0);
1251 goto bad;
1252 }
1253 if (!doingdirectory) {
1254 error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0,
1255 &ip->de_dirclust, 0);
1256 if (error) {
1257 /* XXX should downgrade to ro here, fs is corrupt */
1258 if (newparent)
1259 VOP_UNLOCK(fdvp, 0);
1260 VOP_UNLOCK(fvp, 0);
1261 goto bad;
1262 }
1263 if (ip->de_dirclust == MSDOSFSROOT)
1264 ip->de_diroffset = to_diroffset;
1265 else
1266 ip->de_diroffset = to_diroffset & pmp->pm_crbomask;
1267 }
1268 reinsert(ip);
1269 if (newparent)
1270 VOP_UNLOCK(fdvp, 0);
1271 }
1272
1273 /*
1274 * If we moved a directory to a new parent directory, then we must
1275 * fixup the ".." entry in the moved directory.
1276 */
1277 if (doingdirectory && newparent) {
1278 cn = ip->de_StartCluster;
1279 if (cn == MSDOSFSROOT) {
1280 /* this should never happen */
1281 panic("msdosfs_rename(): updating .. in root directory?");
1282 } else
1283 bn = cntobn(pmp, cn);
1284 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster,
1285 NOCRED, &bp);
1286 if (error) {
1287 /* XXX should downgrade to ro here, fs is corrupt */
1288 brelse(bp);
1289 VOP_UNLOCK(fvp, 0);
1290 goto bad;
1291 }
1292 dotdotp = (struct direntry *)bp->b_data + 1;
1293 pcl = dp->de_StartCluster;
1294 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk)
1295 pcl = MSDOSFSROOT;
1296 putushort(dotdotp->deStartCluster, pcl);
1297 if (FAT32(pmp))
1298 putushort(dotdotp->deHighClust, pcl >> 16);
1299 if (DOINGASYNC(fvp))
1300 bdwrite(bp);
1301 else if ((error = bwrite(bp)) != 0) {
1302 /* XXX should downgrade to ro here, fs is corrupt */
1303 VOP_UNLOCK(fvp, 0);
1304 goto bad;
1305 }
1306 }
1307
1308 /*
1309 * The msdosfs lookup is case insensitive. Several aliases may
1310 * be inserted for a single directory entry. As a consequnce,
1311 * name cache purge done by lookup for fvp when DELETE op for
1312 * namei is specified, might be not enough to expunge all
1313 * namecache entries that were installed for this direntry.
1314 */
1315 cache_purge(fvp);
1316 VOP_UNLOCK(fvp, 0);
1317 bad:
1318 if (xp)
1319 vput(tvp);
1320 vput(tdvp);
1321 out:
1322 ip->de_flag &= ~DE_RENAME;
1323 vrele(fdvp);
1324 vrele(fvp);
1325 return (error);
1326
1327 }
1328
1329 static struct {
1330 struct direntry dot;
1331 struct direntry dotdot;
1332 } dosdirtemplate = {
1333 { ". ", /* the . entry */
1334 ATTR_DIRECTORY, /* file attribute */
1335 0, /* reserved */
1336 0, { 0, 0 }, { 0, 0 }, /* create time & date */
1337 { 0, 0 }, /* access date */
1338 { 0, 0 }, /* high bits of start cluster */
1339 { 210, 4 }, { 210, 4 }, /* modify time & date */
1340 { 0, 0 }, /* startcluster */
1341 { 0, 0, 0, 0 } /* filesize */
1342 },
1343 { ".. ", /* the .. entry */
1344 ATTR_DIRECTORY, /* file attribute */
1345 0, /* reserved */
1346 0, { 0, 0 }, { 0, 0 }, /* create time & date */
1347 { 0, 0 }, /* access date */
1348 { 0, 0 }, /* high bits of start cluster */
1349 { 210, 4 }, { 210, 4 }, /* modify time & date */
1350 { 0, 0 }, /* startcluster */
1351 { 0, 0, 0, 0 } /* filesize */
1352 }
1353 };
1354
1355 static int
1356 msdosfs_mkdir(ap)
1357 struct vop_mkdir_args /* {
1358 struct vnode *a_dvp;
1359 struct vnode **a_vpp;
1360 struvt componentname *a_cnp;
1361 struct vattr *a_vap;
1362 } */ *ap;
1363 {
1364 struct componentname *cnp = ap->a_cnp;
1365 struct denode *dep;
1366 struct denode *pdep = VTODE(ap->a_dvp);
1367 struct direntry *denp;
1368 struct msdosfsmount *pmp = pdep->de_pmp;
1369 struct buf *bp;
1370 u_long newcluster, pcl;
1371 int bn;
1372 int error;
1373 struct denode ndirent;
1374 struct timespec ts;
1375
1376 /*
1377 * If this is the root directory and there is no space left we
1378 * can't do anything. This is because the root directory can not
1379 * change size.
1380 */
1381 if (pdep->de_StartCluster == MSDOSFSROOT
1382 && pdep->de_fndoffset >= pdep->de_FileSize) {
1383 error = ENOSPC;
1384 goto bad2;
1385 }
1386
1387 /*
1388 * Allocate a cluster to hold the about to be created directory.
1389 */
1390 error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL);
1391 if (error)
1392 goto bad2;
1393
1394 bzero(&ndirent, sizeof(ndirent));
1395 ndirent.de_pmp = pmp;
1396 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE;
1397 getnanotime(&ts);
1398 DETIMES(&ndirent, &ts, &ts, &ts);
1399
1400 /*
1401 * Now fill the cluster with the "." and ".." entries. And write
1402 * the cluster to disk. This way it is there for the parent
1403 * directory to be pointing at if there were a crash.
1404 */
1405 bn = cntobn(pmp, newcluster);
1406 /* always succeeds */
1407 bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0, 0);
1408 bzero(bp->b_data, pmp->pm_bpcluster);
1409 bcopy(&dosdirtemplate, bp->b_data, sizeof dosdirtemplate);
1410 denp = (struct direntry *)bp->b_data;
1411 putushort(denp[0].deStartCluster, newcluster);
1412 putushort(denp[0].deCDate, ndirent.de_CDate);
1413 putushort(denp[0].deCTime, ndirent.de_CTime);
1414 denp[0].deCHundredth = ndirent.de_CHun;
1415 putushort(denp[0].deADate, ndirent.de_ADate);
1416 putushort(denp[0].deMDate, ndirent.de_MDate);
1417 putushort(denp[0].deMTime, ndirent.de_MTime);
1418 pcl = pdep->de_StartCluster;
1419 /*
1420 * Although the root directory has a non-magic starting cluster
1421 * number for FAT32, chkdsk and fsck_msdosfs still require
1422 * references to it in dotdot entries to be magic.
1423 */
1424 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk)
1425 pcl = MSDOSFSROOT;
1426 putushort(denp[1].deStartCluster, pcl);
1427 putushort(denp[1].deCDate, ndirent.de_CDate);
1428 putushort(denp[1].deCTime, ndirent.de_CTime);
1429 denp[1].deCHundredth = ndirent.de_CHun;
1430 putushort(denp[1].deADate, ndirent.de_ADate);
1431 putushort(denp[1].deMDate, ndirent.de_MDate);
1432 putushort(denp[1].deMTime, ndirent.de_MTime);
1433 if (FAT32(pmp)) {
1434 putushort(denp[0].deHighClust, newcluster >> 16);
1435 putushort(denp[1].deHighClust, pcl >> 16);
1436 }
1437
1438 if (DOINGASYNC(ap->a_dvp))
1439 bdwrite(bp);
1440 else if ((error = bwrite(bp)) != 0)
1441 goto bad;
1442
1443 /*
1444 * Now build up a directory entry pointing to the newly allocated
1445 * cluster. This will be written to an empty slot in the parent
1446 * directory.
1447 */
1448 #ifdef DIAGNOSTIC
1449 if ((cnp->cn_flags & HASBUF) == 0)
1450 panic("msdosfs_mkdir: no name");
1451 #endif
1452 error = uniqdosname(pdep, cnp, ndirent.de_Name);
1453 if (error)
1454 goto bad;
1455
1456 ndirent.de_Attributes = ATTR_DIRECTORY;
1457 ndirent.de_LowerCase = 0;
1458 ndirent.de_StartCluster = newcluster;
1459 ndirent.de_FileSize = 0;
1460 error = createde(&ndirent, pdep, &dep, cnp);
1461 if (error)
1462 goto bad;
1463 *ap->a_vpp = DETOV(dep);
1464 return (0);
1465
1466 bad:
1467 clusterfree(pmp, newcluster, NULL);
1468 bad2:
1469 return (error);
1470 }
1471
1472 static int
1473 msdosfs_rmdir(ap)
1474 struct vop_rmdir_args /* {
1475 struct vnode *a_dvp;
1476 struct vnode *a_vp;
1477 struct componentname *a_cnp;
1478 } */ *ap;
1479 {
1480 struct vnode *vp = ap->a_vp;
1481 struct vnode *dvp = ap->a_dvp;
1482 struct componentname *cnp = ap->a_cnp;
1483 struct denode *ip, *dp;
1484 int error;
1485
1486 ip = VTODE(vp);
1487 dp = VTODE(dvp);
1488
1489 /*
1490 * Verify the directory is empty (and valid).
1491 * (Rmdir ".." won't be valid since
1492 * ".." will contain a reference to
1493 * the current directory and thus be
1494 * non-empty.)
1495 */
1496 error = 0;
1497 if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) {
1498 error = ENOTEMPTY;
1499 goto out;
1500 }
1501 /*
1502 * Delete the entry from the directory. For dos filesystems this
1503 * gets rid of the directory entry on disk, the in memory copy
1504 * still exists but the de_refcnt is <= 0. This prevents it from
1505 * being found by deget(). When the vput() on dep is done we give
1506 * up access and eventually msdosfs_reclaim() will be called which
1507 * will remove it from the denode cache.
1508 */
1509 error = removede(dp, ip);
1510 if (error)
1511 goto out;
1512 /*
1513 * This is where we decrement the link count in the parent
1514 * directory. Since dos filesystems don't do this we just purge
1515 * the name cache.
1516 */
1517 cache_purge(dvp);
1518 /*
1519 * Truncate the directory that is being deleted.
1520 */
1521 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred);
1522 cache_purge(vp);
1523
1524 out:
1525 return (error);
1526 }
1527
1528 /*
1529 * DOS filesystems don't know what symlinks are.
1530 */
1531 static int
1532 msdosfs_symlink(ap)
1533 struct vop_symlink_args /* {
1534 struct vnode *a_dvp;
1535 struct vnode **a_vpp;
1536 struct componentname *a_cnp;
1537 struct vattr *a_vap;
1538 char *a_target;
1539 } */ *ap;
1540 {
1541 return (EOPNOTSUPP);
1542 }
1543
1544 static int
1545 msdosfs_readdir(ap)
1546 struct vop_readdir_args /* {
1547 struct vnode *a_vp;
1548 struct uio *a_uio;
1549 struct ucred *a_cred;
1550 int *a_eofflag;
1551 int *a_ncookies;
1552 u_long **a_cookies;
1553 } */ *ap;
1554 {
1555 struct mbnambuf nb;
1556 int error = 0;
1557 int diff;
1558 long n;
1559 int blsize;
1560 long on;
1561 u_long cn;
1562 uint64_t fileno;
1563 u_long dirsperblk;
1564 long bias = 0;
1565 daddr_t bn, lbn;
1566 struct buf *bp;
1567 struct denode *dep = VTODE(ap->a_vp);
1568 struct msdosfsmount *pmp = dep->de_pmp;
1569 struct direntry *dentp;
1570 struct dirent dirbuf;
1571 struct uio *uio = ap->a_uio;
1572 u_long *cookies = NULL;
1573 int ncookies = 0;
1574 off_t offset, off;
1575 int chksum = -1;
1576
1577 #ifdef MSDOSFS_DEBUG
1578 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n",
1579 ap->a_vp, uio, ap->a_cred, ap->a_eofflag);
1580 #endif
1581
1582 /*
1583 * msdosfs_readdir() won't operate properly on regular files since
1584 * it does i/o only with the filesystem vnode, and hence can
1585 * retrieve the wrong block from the buffer cache for a plain file.
1586 * So, fail attempts to readdir() on a plain file.
1587 */
1588 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0)
1589 return (ENOTDIR);
1590
1591 /*
1592 * To be safe, initialize dirbuf
1593 */
1594 bzero(dirbuf.d_name, sizeof(dirbuf.d_name));
1595
1596 /*
1597 * If the user buffer is smaller than the size of one dos directory
1598 * entry or the file offset is not a multiple of the size of a
1599 * directory entry, then we fail the read.
1600 */
1601 off = offset = uio->uio_offset;
1602 if (uio->uio_resid < sizeof(struct direntry) ||
1603 (offset & (sizeof(struct direntry) - 1)))
1604 return (EINVAL);
1605
1606 if (ap->a_ncookies) {
1607 ncookies = uio->uio_resid / 16;
1608 cookies = malloc(ncookies * sizeof(u_long), M_TEMP,
1609 M_WAITOK);
1610 *ap->a_cookies = cookies;
1611 *ap->a_ncookies = ncookies;
1612 }
1613
1614 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry);
1615
1616 /*
1617 * If they are reading from the root directory then, we simulate
1618 * the . and .. entries since these don't exist in the root
1619 * directory. We also set the offset bias to make up for having to
1620 * simulate these entries. By this I mean that at file offset 64 we
1621 * read the first entry in the root directory that lives on disk.
1622 */
1623 if (dep->de_StartCluster == MSDOSFSROOT
1624 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) {
1625 #if 0
1626 printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n",
1627 offset);
1628 #endif
1629 bias = 2 * sizeof(struct direntry);
1630 if (offset < bias) {
1631 for (n = (int)offset / sizeof(struct direntry);
1632 n < 2; n++) {
1633 if (FAT32(pmp))
1634 fileno = (uint64_t)cntobn(pmp,
1635 pmp->pm_rootdirblk)
1636 * dirsperblk;
1637 else
1638 fileno = 1;
1639 if (pmp->pm_flags & MSDOSFS_LARGEFS) {
1640 dirbuf.d_fileno =
1641 msdosfs_fileno_map(pmp->pm_mountp,
1642 fileno);
1643 } else {
1644
1645 dirbuf.d_fileno = (uint32_t)fileno;
1646 }
1647 dirbuf.d_type = DT_DIR;
1648 switch (n) {
1649 case 0:
1650 dirbuf.d_namlen = 1;
1651 strcpy(dirbuf.d_name, ".");
1652 break;
1653 case 1:
1654 dirbuf.d_namlen = 2;
1655 strcpy(dirbuf.d_name, "..");
1656 break;
1657 }
1658 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf);
1659 if (uio->uio_resid < dirbuf.d_reclen)
1660 goto out;
1661 error = uiomove(&dirbuf, dirbuf.d_reclen, uio);
1662 if (error)
1663 goto out;
1664 offset += sizeof(struct direntry);
1665 off = offset;
1666 if (cookies) {
1667 *cookies++ = offset;
1668 if (--ncookies <= 0)
1669 goto out;
1670 }
1671 }
1672 }
1673 }
1674
1675 mbnambuf_init(&nb);
1676 off = offset;
1677 while (uio->uio_resid > 0) {
1678 lbn = de_cluster(pmp, offset - bias);
1679 on = (offset - bias) & pmp->pm_crbomask;
1680 n = min(pmp->pm_bpcluster - on, uio->uio_resid);
1681 diff = dep->de_FileSize - (offset - bias);
1682 if (diff <= 0)
1683 break;
1684 n = min(n, diff);
1685 error = pcbmap(dep, lbn, &bn, &cn, &blsize);
1686 if (error)
1687 break;
1688 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp);
1689 if (error) {
1690 brelse(bp);
1691 return (error);
1692 }
1693 n = min(n, blsize - bp->b_resid);
1694 if (n == 0) {
1695 brelse(bp);
1696 return (EIO);
1697 }
1698
1699 /*
1700 * Convert from dos directory entries to fs-independent
1701 * directory entries.
1702 */
1703 for (dentp = (struct direntry *)(bp->b_data + on);
1704 (char *)dentp < bp->b_data + on + n;
1705 dentp++, offset += sizeof(struct direntry)) {
1706 #if 0
1707 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n",
1708 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes);
1709 #endif
1710 /*
1711 * If this is an unused entry, we can stop.
1712 */
1713 if (dentp->deName[0] == SLOT_EMPTY) {
1714 brelse(bp);
1715 goto out;
1716 }
1717 /*
1718 * Skip deleted entries.
1719 */
1720 if (dentp->deName[0] == SLOT_DELETED) {
1721 chksum = -1;
1722 mbnambuf_init(&nb);
1723 continue;
1724 }
1725
1726 /*
1727 * Handle Win95 long directory entries
1728 */
1729 if (dentp->deAttributes == ATTR_WIN95) {
1730 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME)
1731 continue;
1732 chksum = win2unixfn(&nb,
1733 (struct winentry *)dentp, chksum, pmp);
1734 continue;
1735 }
1736
1737 /*
1738 * Skip volume labels
1739 */
1740 if (dentp->deAttributes & ATTR_VOLUME) {
1741 chksum = -1;
1742 mbnambuf_init(&nb);
1743 continue;
1744 }
1745 /*
1746 * This computation of d_fileno must match
1747 * the computation of va_fileid in
1748 * msdosfs_getattr.
1749 */
1750 if (dentp->deAttributes & ATTR_DIRECTORY) {
1751 fileno = getushort(dentp->deStartCluster);
1752 if (FAT32(pmp))
1753 fileno |= getushort(dentp->deHighClust) << 16;
1754 /* if this is the root directory */
1755 if (fileno == MSDOSFSROOT)
1756 if (FAT32(pmp))
1757 fileno = (uint64_t)cntobn(pmp,
1758 pmp->pm_rootdirblk)
1759 * dirsperblk;
1760 else
1761 fileno = 1;
1762 else
1763 fileno = (uint64_t)cntobn(pmp, fileno) *
1764 dirsperblk;
1765 dirbuf.d_type = DT_DIR;
1766 } else {
1767 fileno = (uoff_t)offset /
1768 sizeof(struct direntry);
1769 dirbuf.d_type = DT_REG;
1770 }
1771 if (pmp->pm_flags & MSDOSFS_LARGEFS) {
1772 dirbuf.d_fileno =
1773 msdosfs_fileno_map(pmp->pm_mountp, fileno);
1774 } else
1775 dirbuf.d_fileno = (uint32_t)fileno;
1776
1777 if (chksum != winChksum(dentp->deName)) {
1778 dirbuf.d_namlen = dos2unixfn(dentp->deName,
1779 (u_char *)dirbuf.d_name,
1780 dentp->deLowerCase |
1781 ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ?
1782 (LCASE_BASE | LCASE_EXT) : 0),
1783 pmp);
1784 mbnambuf_init(&nb);
1785 } else
1786 mbnambuf_flush(&nb, &dirbuf);
1787 chksum = -1;
1788 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf);
1789 if (uio->uio_resid < dirbuf.d_reclen) {
1790 brelse(bp);
1791 goto out;
1792 }
1793 error = uiomove(&dirbuf, dirbuf.d_reclen, uio);
1794 if (error) {
1795 brelse(bp);
1796 goto out;
1797 }
1798 if (cookies) {
1799 *cookies++ = offset + sizeof(struct direntry);
1800 if (--ncookies <= 0) {
1801 brelse(bp);
1802 goto out;
1803 }
1804 }
1805 off = offset + sizeof(struct direntry);
1806 }
1807 brelse(bp);
1808 }
1809 out:
1810 /* Subtract unused cookies */
1811 if (ap->a_ncookies)
1812 *ap->a_ncookies -= ncookies;
1813
1814 uio->uio_offset = off;
1815
1816 /*
1817 * Set the eofflag (NFS uses it)
1818 */
1819 if (ap->a_eofflag) {
1820 if (dep->de_FileSize - (offset - bias) <= 0)
1821 *ap->a_eofflag = 1;
1822 else
1823 *ap->a_eofflag = 0;
1824 }
1825 return (error);
1826 }
1827
1828 /*-
1829 * a_vp - pointer to the file's vnode
1830 * a_bn - logical block number within the file (cluster number for us)
1831 * a_bop - where to return the bufobj of the special file containing the fs
1832 * a_bnp - where to return the "physical" block number corresponding to a_bn
1833 * (relative to the special file; units are blocks of size DEV_BSIZE)
1834 * a_runp - where to return the "run past" a_bn. This is the count of logical
1835 * blocks whose physical blocks (together with a_bn's physical block)
1836 * are contiguous.
1837 * a_runb - where to return the "run before" a_bn.
1838 */
1839 static int
1840 msdosfs_bmap(ap)
1841 struct vop_bmap_args /* {
1842 struct vnode *a_vp;
1843 daddr_t a_bn;
1844 struct bufobj **a_bop;
1845 daddr_t *a_bnp;
1846 int *a_runp;
1847 int *a_runb;
1848 } */ *ap;
1849 {
1850 struct denode *dep;
1851 struct mount *mp;
1852 struct msdosfsmount *pmp;
1853 struct vnode *vp;
1854 daddr_t runbn;
1855 u_long cn;
1856 int bnpercn, error, maxio, maxrun, run;
1857
1858 vp = ap->a_vp;
1859 dep = VTODE(vp);
1860 pmp = dep->de_pmp;
1861 if (ap->a_bop != NULL)
1862 *ap->a_bop = &pmp->pm_devvp->v_bufobj;
1863 if (ap->a_bnp == NULL)
1864 return (0);
1865 if (ap->a_runp != NULL)
1866 *ap->a_runp = 0;
1867 if (ap->a_runb != NULL)
1868 *ap->a_runb = 0;
1869 cn = ap->a_bn;
1870 if (cn != ap->a_bn)
1871 return (EFBIG);
1872 error = pcbmap(dep, cn, ap->a_bnp, NULL, NULL);
1873 if (error != 0 || (ap->a_runp == NULL && ap->a_runb == NULL))
1874 return (error);
1875
1876 mp = vp->v_mount;
1877 maxio = mp->mnt_iosize_max / mp->mnt_stat.f_iosize;
1878 bnpercn = de_cn2bn(pmp, 1);
1879 if (ap->a_runp != NULL) {
1880 maxrun = ulmin(maxio - 1, pmp->pm_maxcluster - cn);
1881 for (run = 1; run <= maxrun; run++) {
1882 if (pcbmap(dep, cn + run, &runbn, NULL, NULL) != 0 ||
1883 runbn != *ap->a_bnp + run * bnpercn)
1884 break;
1885 }
1886 *ap->a_runp = run - 1;
1887 }
1888 if (ap->a_runb != NULL) {
1889 maxrun = ulmin(maxio - 1, cn);
1890 for (run = 1; run < maxrun; run++) {
1891 if (pcbmap(dep, cn - run, &runbn, NULL, NULL) != 0 ||
1892 runbn != *ap->a_bnp - run * bnpercn)
1893 break;
1894 }
1895 *ap->a_runb = run - 1;
1896 }
1897 return (0);
1898 }
1899
1900 static int
1901 msdosfs_strategy(ap)
1902 struct vop_strategy_args /* {
1903 struct vnode *a_vp;
1904 struct buf *a_bp;
1905 } */ *ap;
1906 {
1907 struct buf *bp = ap->a_bp;
1908 struct denode *dep = VTODE(ap->a_vp);
1909 struct bufobj *bo;
1910 int error = 0;
1911 daddr_t blkno;
1912
1913 /*
1914 * If we don't already know the filesystem relative block number
1915 * then get it using pcbmap(). If pcbmap() returns the block
1916 * number as -1 then we've got a hole in the file. DOS filesystems
1917 * don't allow files with holes, so we shouldn't ever see this.
1918 */
1919 if (bp->b_blkno == bp->b_lblkno) {
1920 error = pcbmap(dep, bp->b_lblkno, &blkno, 0, 0);
1921 bp->b_blkno = blkno;
1922 if (error) {
1923 bp->b_error = error;
1924 bp->b_ioflags |= BIO_ERROR;
1925 bufdone(bp);
1926 return (0);
1927 }
1928 if ((long)bp->b_blkno == -1)
1929 vfs_bio_clrbuf(bp);
1930 }
1931 if (bp->b_blkno == -1) {
1932 bufdone(bp);
1933 return (0);
1934 }
1935 /*
1936 * Read/write the block from/to the disk that contains the desired
1937 * file block.
1938 */
1939 bp->b_iooffset = dbtob(bp->b_blkno);
1940 bo = dep->de_pmp->pm_bo;
1941 BO_STRATEGY(bo, bp);
1942 return (0);
1943 }
1944
1945 static int
1946 msdosfs_print(ap)
1947 struct vop_print_args /* {
1948 struct vnode *vp;
1949 } */ *ap;
1950 {
1951 struct denode *dep = VTODE(ap->a_vp);
1952
1953 printf("\tstartcluster %lu, dircluster %lu, diroffset %lu, ",
1954 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset);
1955 printf("on dev %s\n", devtoname(dep->de_pmp->pm_dev));
1956 return (0);
1957 }
1958
1959 static int
1960 msdosfs_pathconf(ap)
1961 struct vop_pathconf_args /* {
1962 struct vnode *a_vp;
1963 int a_name;
1964 int *a_retval;
1965 } */ *ap;
1966 {
1967 struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp;
1968
1969 switch (ap->a_name) {
1970 case _PC_LINK_MAX:
1971 *ap->a_retval = 1;
1972 return (0);
1973 case _PC_NAME_MAX:
1974 *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12;
1975 return (0);
1976 case _PC_PATH_MAX:
1977 *ap->a_retval = PATH_MAX;
1978 return (0);
1979 case _PC_CHOWN_RESTRICTED:
1980 *ap->a_retval = 1;
1981 return (0);
1982 case _PC_NO_TRUNC:
1983 *ap->a_retval = 0;
1984 return (0);
1985 default:
1986 return (EINVAL);
1987 }
1988 /* NOTREACHED */
1989 }
1990
1991 static int
1992 msdosfs_vptofh(ap)
1993 struct vop_vptofh_args /* {
1994 struct vnode *a_vp;
1995 struct fid *a_fhp;
1996 } */ *ap;
1997 {
1998 struct denode *dep;
1999 struct defid *defhp;
2000
2001 dep = VTODE(ap->a_vp);
2002 defhp = (struct defid *)ap->a_fhp;
2003 defhp->defid_len = sizeof(struct defid);
2004 defhp->defid_dirclust = dep->de_dirclust;
2005 defhp->defid_dirofs = dep->de_diroffset;
2006 /* defhp->defid_gen = dep->de_gen; */
2007 return (0);
2008 }
2009
2010 /* Global vfs data structures for msdosfs */
2011 struct vop_vector msdosfs_vnodeops = {
2012 .vop_default = &default_vnodeops,
2013
2014 .vop_access = msdosfs_access,
2015 .vop_bmap = msdosfs_bmap,
2016 .vop_cachedlookup = msdosfs_lookup,
2017 .vop_open = msdosfs_open,
2018 .vop_close = msdosfs_close,
2019 .vop_create = msdosfs_create,
2020 .vop_fsync = msdosfs_fsync,
2021 .vop_getattr = msdosfs_getattr,
2022 .vop_inactive = msdosfs_inactive,
2023 .vop_link = msdosfs_link,
2024 .vop_lookup = vfs_cache_lookup,
2025 .vop_mkdir = msdosfs_mkdir,
2026 .vop_mknod = msdosfs_mknod,
2027 .vop_pathconf = msdosfs_pathconf,
2028 .vop_print = msdosfs_print,
2029 .vop_read = msdosfs_read,
2030 .vop_readdir = msdosfs_readdir,
2031 .vop_reclaim = msdosfs_reclaim,
2032 .vop_remove = msdosfs_remove,
2033 .vop_rename = msdosfs_rename,
2034 .vop_rmdir = msdosfs_rmdir,
2035 .vop_setattr = msdosfs_setattr,
2036 .vop_strategy = msdosfs_strategy,
2037 .vop_symlink = msdosfs_symlink,
2038 .vop_write = msdosfs_write,
2039 .vop_vptofh = msdosfs_vptofh,
2040 };
Cache object: 9904c6ad0a7e5dac72475da29df99eef
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