1 /* $NetBSD: msdosfs_vnops.c,v 1.68 1998/02/10 14:10:04 mrg Exp $ */
2
3 /*-
4 * SPDX-License-Identifier: BSD-4-Clause
5 *
6 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
7 * Copyright (C) 1994, 1995, 1997 TooLs GmbH.
8 * All rights reserved.
9 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by TooLs GmbH.
22 * 4. The name of TooLs GmbH may not be used to endorse or promote products
23 * derived from this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
26 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
27 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
28 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
29 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
30 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
31 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
32 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
33 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
34 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 */
36 /*-
37 * Written by Paul Popelka (paulp@uts.amdahl.com)
38 *
39 * You can do anything you want with this software, just don't say you wrote
40 * it, and don't remove this notice.
41 *
42 * This software is provided "as is".
43 *
44 * The author supplies this software to be publicly redistributed on the
45 * understanding that the author is not responsible for the correct
46 * functioning of this software in any circumstances and is not liable for
47 * any damages caused by this software.
48 *
49 * October 1992
50 */
51
52 #include <sys/param.h>
53 #include <sys/systm.h>
54 #include <sys/bio.h>
55 #include <sys/buf.h>
56 #include <sys/clock.h>
57 #include <sys/dirent.h>
58 #include <sys/lock.h>
59 #include <sys/lockf.h>
60 #include <sys/malloc.h>
61 #include <sys/mount.h>
62 #include <sys/mutex.h>
63 #include <sys/namei.h>
64 #include <sys/priv.h>
65 #include <sys/stat.h>
66 #include <sys/sysctl.h>
67 #include <sys/unistd.h>
68 #include <sys/vmmeter.h>
69 #include <sys/vnode.h>
70
71 #include <vm/vm.h>
72 #include <vm/vm_extern.h>
73 #include <vm/vnode_pager.h>
74
75 #include <fs/msdosfs/bpb.h>
76 #include <fs/msdosfs/direntry.h>
77 #include <fs/msdosfs/denode.h>
78 #include <fs/msdosfs/fat.h>
79 #include <fs/msdosfs/msdosfsmount.h>
80
81 /*
82 * Prototypes for MSDOSFS vnode operations
83 */
84 static vop_create_t msdosfs_create;
85 static vop_mknod_t msdosfs_mknod;
86 static vop_open_t msdosfs_open;
87 static vop_close_t msdosfs_close;
88 static vop_access_t msdosfs_access;
89 static vop_getattr_t msdosfs_getattr;
90 static vop_setattr_t msdosfs_setattr;
91 static vop_read_t msdosfs_read;
92 static vop_write_t msdosfs_write;
93 static vop_fsync_t msdosfs_fsync;
94 static vop_remove_t msdosfs_remove;
95 static vop_link_t msdosfs_link;
96 static vop_rename_t msdosfs_rename;
97 static vop_mkdir_t msdosfs_mkdir;
98 static vop_rmdir_t msdosfs_rmdir;
99 static vop_symlink_t msdosfs_symlink;
100 static vop_readdir_t msdosfs_readdir;
101 static vop_bmap_t msdosfs_bmap;
102 static vop_getpages_t msdosfs_getpages;
103 static vop_strategy_t msdosfs_strategy;
104 static vop_print_t msdosfs_print;
105 static vop_pathconf_t msdosfs_pathconf;
106 static vop_vptofh_t msdosfs_vptofh;
107
108 /*
109 * Some general notes:
110 *
111 * In the ufs filesystem the inodes, superblocks, and indirect blocks are
112 * read/written using the vnode for the filesystem. Blocks that represent
113 * the contents of a file are read/written using the vnode for the file
114 * (including directories when they are read/written as files). This
115 * presents problems for the dos filesystem because data that should be in
116 * an inode (if dos had them) resides in the directory itself. Since we
117 * must update directory entries without the benefit of having the vnode
118 * for the directory we must use the vnode for the filesystem. This means
119 * that when a directory is actually read/written (via read, write, or
120 * readdir, or seek) we must use the vnode for the filesystem instead of
121 * the vnode for the directory as would happen in ufs. This is to insure we
122 * retrieve the correct block from the buffer cache since the hash value is
123 * based upon the vnode address and the desired block number.
124 */
125
126 /*
127 * Create a regular file. On entry the directory to contain the file being
128 * created is locked. We must release before we return. We must also free
129 * the pathname buffer pointed at by cnp->cn_pnbuf, always on error, or
130 * only if the SAVESTART bit in cn_flags is clear on success.
131 */
132 static int
msdosfs_create(struct vop_create_args * ap)133 msdosfs_create(struct vop_create_args *ap)
134 {
135 struct componentname *cnp = ap->a_cnp;
136 struct denode ndirent;
137 struct denode *dep;
138 struct denode *pdep = VTODE(ap->a_dvp);
139 struct timespec ts;
140 int error;
141
142 #ifdef MSDOSFS_DEBUG
143 printf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap);
144 #endif
145
146 /*
147 * If this is the root directory and there is no space left we
148 * can't do anything. This is because the root directory can not
149 * change size.
150 */
151 if (pdep->de_StartCluster == MSDOSFSROOT
152 && pdep->de_fndoffset >= pdep->de_FileSize) {
153 error = ENOSPC;
154 goto bad;
155 }
156
157 /*
158 * Create a directory entry for the file, then call createde() to
159 * have it installed. NOTE: DOS files are always executable. We
160 * use the absence of the owner write bit to make the file
161 * readonly.
162 */
163 #ifdef DIAGNOSTIC
164 if ((cnp->cn_flags & HASBUF) == 0)
165 panic("msdosfs_create: no name");
166 #endif
167 memset(&ndirent, 0, sizeof(ndirent));
168 error = uniqdosname(pdep, cnp, ndirent.de_Name);
169 if (error)
170 goto bad;
171
172 ndirent.de_Attributes = ATTR_ARCHIVE;
173 ndirent.de_LowerCase = 0;
174 ndirent.de_StartCluster = 0;
175 ndirent.de_FileSize = 0;
176 ndirent.de_pmp = pdep->de_pmp;
177 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE;
178 vfs_timestamp(&ts);
179 DETIMES(&ndirent, &ts, &ts, &ts);
180 error = createde(&ndirent, pdep, &dep, cnp);
181 if (error)
182 goto bad;
183 *ap->a_vpp = DETOV(dep);
184 if ((cnp->cn_flags & MAKEENTRY) != 0)
185 cache_enter(ap->a_dvp, *ap->a_vpp, cnp);
186 return (0);
187
188 bad:
189 return (error);
190 }
191
192 static int
msdosfs_mknod(struct vop_mknod_args * ap)193 msdosfs_mknod(struct vop_mknod_args *ap)
194 {
195
196 return (EINVAL);
197 }
198
199 static int
msdosfs_open(struct vop_open_args * ap)200 msdosfs_open(struct vop_open_args *ap)
201 {
202 struct denode *dep = VTODE(ap->a_vp);
203 vnode_create_vobject(ap->a_vp, dep->de_FileSize, ap->a_td);
204 return 0;
205 }
206
207 static int
msdosfs_close(struct vop_close_args * ap)208 msdosfs_close(struct vop_close_args *ap)
209 {
210 struct vnode *vp = ap->a_vp;
211 struct denode *dep = VTODE(vp);
212 struct timespec ts;
213
214 VI_LOCK(vp);
215 if (vp->v_usecount > 1) {
216 vfs_timestamp(&ts);
217 DETIMES(dep, &ts, &ts, &ts);
218 }
219 VI_UNLOCK(vp);
220 return 0;
221 }
222
223 static int
msdosfs_access(struct vop_access_args * ap)224 msdosfs_access(struct vop_access_args *ap)
225 {
226 struct vnode *vp = ap->a_vp;
227 struct denode *dep = VTODE(ap->a_vp);
228 struct msdosfsmount *pmp = dep->de_pmp;
229 mode_t file_mode;
230 accmode_t accmode = ap->a_accmode;
231
232 file_mode = S_IRWXU|S_IRWXG|S_IRWXO;
233 file_mode &= (vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask);
234
235 /*
236 * Disallow writing to directories and regular files if the
237 * filesystem is read-only.
238 */
239 if (accmode & VWRITE) {
240 switch (vp->v_type) {
241 case VREG:
242 case VDIR:
243 if (vp->v_mount->mnt_flag & MNT_RDONLY)
244 return (EROFS);
245 break;
246 default:
247 break;
248 }
249 }
250
251 return (vaccess(vp->v_type, file_mode, pmp->pm_uid, pmp->pm_gid,
252 ap->a_accmode, ap->a_cred));
253 }
254
255 static int
msdosfs_getattr(struct vop_getattr_args * ap)256 msdosfs_getattr(struct vop_getattr_args *ap)
257 {
258 struct denode *dep = VTODE(ap->a_vp);
259 struct msdosfsmount *pmp = dep->de_pmp;
260 struct vattr *vap = ap->a_vap;
261 mode_t mode;
262 struct timespec ts;
263 u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry);
264 uint64_t fileid;
265
266 vfs_timestamp(&ts);
267 DETIMES(dep, &ts, &ts, &ts);
268 vap->va_fsid = dev2udev(pmp->pm_dev);
269 /*
270 * The following computation of the fileid must be the same as that
271 * used in msdosfs_readdir() to compute d_fileno. If not, pwd
272 * doesn't work.
273 */
274 if (dep->de_Attributes & ATTR_DIRECTORY) {
275 fileid = (uint64_t)cntobn(pmp, dep->de_StartCluster) *
276 dirsperblk;
277 if (dep->de_StartCluster == MSDOSFSROOT)
278 fileid = 1;
279 } else {
280 fileid = (uint64_t)cntobn(pmp, dep->de_dirclust) *
281 dirsperblk;
282 if (dep->de_dirclust == MSDOSFSROOT)
283 fileid = (uint64_t)roottobn(pmp, 0) * dirsperblk;
284 fileid += (uoff_t)dep->de_diroffset / sizeof(struct direntry);
285 }
286 vap->va_fileid = fileid;
287
288 mode = S_IRWXU|S_IRWXG|S_IRWXO;
289 if (dep->de_Attributes & ATTR_READONLY)
290 mode &= ~(S_IWUSR|S_IWGRP|S_IWOTH);
291 vap->va_mode = mode &
292 (ap->a_vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask);
293 vap->va_uid = pmp->pm_uid;
294 vap->va_gid = pmp->pm_gid;
295 vap->va_nlink = 1;
296 vap->va_rdev = NODEV;
297 vap->va_size = dep->de_FileSize;
298 fattime2timespec(dep->de_MDate, dep->de_MTime, 0, 0, &vap->va_mtime);
299 vap->va_ctime = vap->va_mtime;
300 if (pmp->pm_flags & MSDOSFSMNT_LONGNAME) {
301 fattime2timespec(dep->de_ADate, 0, 0, 0, &vap->va_atime);
302 fattime2timespec(dep->de_CDate, dep->de_CTime, dep->de_CHun,
303 0, &vap->va_birthtime);
304 } else {
305 vap->va_atime = vap->va_mtime;
306 vap->va_birthtime.tv_sec = -1;
307 vap->va_birthtime.tv_nsec = 0;
308 }
309 vap->va_flags = 0;
310 if (dep->de_Attributes & ATTR_ARCHIVE)
311 vap->va_flags |= UF_ARCHIVE;
312 if (dep->de_Attributes & ATTR_HIDDEN)
313 vap->va_flags |= UF_HIDDEN;
314 if (dep->de_Attributes & ATTR_READONLY)
315 vap->va_flags |= UF_READONLY;
316 if (dep->de_Attributes & ATTR_SYSTEM)
317 vap->va_flags |= UF_SYSTEM;
318 vap->va_gen = 0;
319 vap->va_blocksize = pmp->pm_bpcluster;
320 if (dep->de_StartCluster != MSDOSFSROOT)
321 vap->va_bytes =
322 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask;
323 else
324 vap->va_bytes = 0; /* FAT12/FAT16 root dir in reserved area */
325 vap->va_type = ap->a_vp->v_type;
326 vap->va_filerev = dep->de_modrev;
327 return (0);
328 }
329
330 static int
msdosfs_setattr(struct vop_setattr_args * ap)331 msdosfs_setattr(struct vop_setattr_args *ap)
332 {
333 struct vnode *vp = ap->a_vp;
334 struct denode *dep = VTODE(ap->a_vp);
335 struct msdosfsmount *pmp = dep->de_pmp;
336 struct vattr *vap = ap->a_vap;
337 struct ucred *cred = ap->a_cred;
338 struct thread *td = curthread;
339 int error = 0;
340
341 #ifdef MSDOSFS_DEBUG
342 printf("msdosfs_setattr(): vp %p, vap %p, cred %p\n",
343 ap->a_vp, vap, cred);
344 #endif
345
346 /*
347 * Check for unsettable attributes.
348 */
349 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
350 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
351 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
352 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
353 #ifdef MSDOSFS_DEBUG
354 printf("msdosfs_setattr(): returning EINVAL\n");
355 printf(" va_type %d, va_nlink %llx, va_fsid %llx, va_fileid %llx\n",
356 vap->va_type, (unsigned long long)vap->va_nlink,
357 (unsigned long long)vap->va_fsid,
358 (unsigned long long)vap->va_fileid);
359 printf(" va_blocksize %lx, va_rdev %llx, va_bytes %llx, va_gen %lx\n",
360 vap->va_blocksize, (unsigned long long)vap->va_rdev,
361 (unsigned long long)vap->va_bytes, vap->va_gen);
362 printf(" va_uid %x, va_gid %x\n",
363 vap->va_uid, vap->va_gid);
364 #endif
365 return (EINVAL);
366 }
367
368 /*
369 * We don't allow setting attributes on the root directory.
370 * The special case for the root directory is because before
371 * FAT32, the root directory didn't have an entry for itself
372 * (and was otherwise special). With FAT32, the root
373 * directory is not so special, but still doesn't have an
374 * entry for itself.
375 */
376 if (vp->v_vflag & VV_ROOT)
377 return (EINVAL);
378
379 if (vap->va_flags != VNOVAL) {
380 if (vp->v_mount->mnt_flag & MNT_RDONLY)
381 return (EROFS);
382 if (cred->cr_uid != pmp->pm_uid) {
383 error = priv_check_cred(cred, PRIV_VFS_ADMIN);
384 if (error)
385 return (error);
386 }
387 /*
388 * We are very inconsistent about handling unsupported
389 * attributes. We ignored the access time and the
390 * read and execute bits. We were strict for the other
391 * attributes.
392 */
393 if (vap->va_flags & ~(UF_ARCHIVE | UF_HIDDEN | UF_READONLY |
394 UF_SYSTEM))
395 return EOPNOTSUPP;
396 if (vap->va_flags & UF_ARCHIVE)
397 dep->de_Attributes |= ATTR_ARCHIVE;
398 else
399 dep->de_Attributes &= ~ATTR_ARCHIVE;
400 if (vap->va_flags & UF_HIDDEN)
401 dep->de_Attributes |= ATTR_HIDDEN;
402 else
403 dep->de_Attributes &= ~ATTR_HIDDEN;
404 /* We don't allow changing the readonly bit on directories. */
405 if (vp->v_type != VDIR) {
406 if (vap->va_flags & UF_READONLY)
407 dep->de_Attributes |= ATTR_READONLY;
408 else
409 dep->de_Attributes &= ~ATTR_READONLY;
410 }
411 if (vap->va_flags & UF_SYSTEM)
412 dep->de_Attributes |= ATTR_SYSTEM;
413 else
414 dep->de_Attributes &= ~ATTR_SYSTEM;
415 dep->de_flag |= DE_MODIFIED;
416 }
417
418 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
419 uid_t uid;
420 gid_t gid;
421
422 if (vp->v_mount->mnt_flag & MNT_RDONLY)
423 return (EROFS);
424 uid = vap->va_uid;
425 if (uid == (uid_t)VNOVAL)
426 uid = pmp->pm_uid;
427 gid = vap->va_gid;
428 if (gid == (gid_t)VNOVAL)
429 gid = pmp->pm_gid;
430 if (cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid ||
431 (gid != pmp->pm_gid && !groupmember(gid, cred))) {
432 error = priv_check_cred(cred, PRIV_VFS_CHOWN);
433 if (error)
434 return (error);
435 }
436 if (uid != pmp->pm_uid || gid != pmp->pm_gid)
437 return EINVAL;
438 }
439
440 if (vap->va_size != VNOVAL) {
441 switch (vp->v_type) {
442 case VDIR:
443 return (EISDIR);
444 case VREG:
445 /*
446 * Truncation is only supported for regular files,
447 * Disallow it if the filesystem is read-only.
448 */
449 if (vp->v_mount->mnt_flag & MNT_RDONLY)
450 return (EROFS);
451 break;
452 default:
453 /*
454 * According to POSIX, the result is unspecified
455 * for file types other than regular files,
456 * directories and shared memory objects. We
457 * don't support any file types except regular
458 * files and directories in this file system, so
459 * this (default) case is unreachable and can do
460 * anything. Keep falling through to detrunc()
461 * for now.
462 */
463 break;
464 }
465 error = vn_rlimit_trunc(vap->va_size, td);
466 if (error != 0)
467 return (error);
468 error = detrunc(dep, vap->va_size, 0, cred);
469 if (error)
470 return error;
471 }
472 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
473 if (vp->v_mount->mnt_flag & MNT_RDONLY)
474 return (EROFS);
475 error = vn_utimes_perm(vp, vap, cred, td);
476 if (error != 0)
477 return (error);
478 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 &&
479 vap->va_atime.tv_sec != VNOVAL) {
480 dep->de_flag &= ~DE_ACCESS;
481 timespec2fattime(&vap->va_atime, 0,
482 &dep->de_ADate, NULL, NULL);
483 }
484 if (vap->va_mtime.tv_sec != VNOVAL) {
485 dep->de_flag &= ~DE_UPDATE;
486 timespec2fattime(&vap->va_mtime, 0,
487 &dep->de_MDate, &dep->de_MTime, NULL);
488 }
489 /*
490 * We don't set the archive bit when modifying the time of
491 * a directory to emulate the Windows/DOS behavior.
492 */
493 if (vp->v_type != VDIR)
494 dep->de_Attributes |= ATTR_ARCHIVE;
495 dep->de_flag |= DE_MODIFIED;
496 }
497 /*
498 * DOS files only have the ability to have their writability
499 * attribute set, so we use the owner write bit to set the readonly
500 * attribute.
501 */
502 if (vap->va_mode != (mode_t)VNOVAL) {
503 if (vp->v_mount->mnt_flag & MNT_RDONLY)
504 return (EROFS);
505 if (cred->cr_uid != pmp->pm_uid) {
506 error = priv_check_cred(cred, PRIV_VFS_ADMIN);
507 if (error)
508 return (error);
509 }
510 if (vp->v_type != VDIR) {
511 /* We ignore the read and execute bits. */
512 if (vap->va_mode & S_IWUSR)
513 dep->de_Attributes &= ~ATTR_READONLY;
514 else
515 dep->de_Attributes |= ATTR_READONLY;
516 dep->de_Attributes |= ATTR_ARCHIVE;
517 dep->de_flag |= DE_MODIFIED;
518 }
519 }
520 return (deupdat(dep, 0));
521 }
522
523 static int
msdosfs_read(struct vop_read_args * ap)524 msdosfs_read(struct vop_read_args *ap)
525 {
526 int error = 0;
527 int blsize;
528 int isadir;
529 ssize_t orig_resid;
530 u_int n;
531 u_long diff;
532 u_long on;
533 daddr_t lbn;
534 daddr_t rablock;
535 int rasize;
536 int seqcount;
537 struct buf *bp;
538 struct vnode *vp = ap->a_vp;
539 struct denode *dep = VTODE(vp);
540 struct msdosfsmount *pmp = dep->de_pmp;
541 struct uio *uio = ap->a_uio;
542
543 /*
544 * If they didn't ask for any data, then we are done.
545 */
546 orig_resid = uio->uio_resid;
547 if (orig_resid == 0)
548 return (0);
549
550 /*
551 * The caller is supposed to ensure that
552 * uio->uio_offset >= 0 and uio->uio_resid >= 0.
553 * We don't need to check for large offsets as in ffs because
554 * dep->de_FileSize <= MSDOSFS_FILESIZE_MAX < OFF_MAX, so large
555 * offsets cannot cause overflow even in theory.
556 */
557
558 seqcount = ap->a_ioflag >> IO_SEQSHIFT;
559
560 isadir = dep->de_Attributes & ATTR_DIRECTORY;
561 do {
562 if (uio->uio_offset >= dep->de_FileSize)
563 break;
564 lbn = de_cluster(pmp, uio->uio_offset);
565 rablock = lbn + 1;
566 blsize = pmp->pm_bpcluster;
567 on = uio->uio_offset & pmp->pm_crbomask;
568 /*
569 * If we are operating on a directory file then be sure to
570 * do i/o with the vnode for the filesystem instead of the
571 * vnode for the directory.
572 */
573 if (isadir) {
574 /* convert cluster # to block # */
575 error = pcbmap(dep, lbn, &lbn, 0, &blsize);
576 if (error == E2BIG) {
577 error = EINVAL;
578 break;
579 } else if (error)
580 break;
581 error = bread(pmp->pm_devvp, lbn, blsize, NOCRED, &bp);
582 } else if (de_cn2off(pmp, rablock) >= dep->de_FileSize) {
583 error = bread(vp, lbn, blsize, NOCRED, &bp);
584 } else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) {
585 error = cluster_read(vp, dep->de_FileSize, lbn, blsize,
586 NOCRED, on + uio->uio_resid, seqcount, 0, &bp);
587 } else if (seqcount > 1) {
588 rasize = blsize;
589 error = breadn(vp, lbn,
590 blsize, &rablock, &rasize, 1, NOCRED, &bp);
591 } else {
592 error = bread(vp, lbn, blsize, NOCRED, &bp);
593 }
594 if (error) {
595 brelse(bp);
596 break;
597 }
598 diff = pmp->pm_bpcluster - on;
599 n = diff > uio->uio_resid ? uio->uio_resid : diff;
600 diff = dep->de_FileSize - uio->uio_offset;
601 if (diff < n)
602 n = diff;
603 diff = blsize - bp->b_resid;
604 if (diff < n)
605 n = diff;
606 error = vn_io_fault_uiomove(bp->b_data + on, (int) n, uio);
607 brelse(bp);
608 } while (error == 0 && uio->uio_resid > 0 && n != 0);
609 if (!isadir && (error == 0 || uio->uio_resid != orig_resid) &&
610 (vp->v_mount->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0)
611 dep->de_flag |= DE_ACCESS;
612 return (error);
613 }
614
615 /*
616 * Write data to a file or directory.
617 */
618 static int
msdosfs_write(struct vop_write_args * ap)619 msdosfs_write(struct vop_write_args *ap)
620 {
621 int n;
622 int croffset;
623 ssize_t resid, r;
624 u_long osize;
625 int error = 0;
626 u_long count;
627 int seqcount;
628 daddr_t bn, lastcn;
629 struct buf *bp;
630 int ioflag = ap->a_ioflag;
631 struct uio *uio = ap->a_uio;
632 struct vnode *vp = ap->a_vp;
633 struct vnode *thisvp;
634 struct denode *dep = VTODE(vp);
635 struct msdosfsmount *pmp = dep->de_pmp;
636 struct ucred *cred = ap->a_cred;
637
638 #ifdef MSDOSFS_DEBUG
639 printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n",
640 vp, uio, ioflag, cred);
641 printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n",
642 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster);
643 #endif
644
645 switch (vp->v_type) {
646 case VREG:
647 if (ioflag & IO_APPEND)
648 uio->uio_offset = dep->de_FileSize;
649 thisvp = vp;
650 break;
651 case VDIR:
652 return EISDIR;
653 default:
654 panic("msdosfs_write(): bad file type");
655 }
656
657 /*
658 * This is needed (unlike in ffs_write()) because we extend the
659 * file outside of the loop but we don't want to extend the file
660 * for writes of 0 bytes.
661 */
662 if (uio->uio_resid == 0)
663 return (0);
664
665 /*
666 * The caller is supposed to ensure that
667 * uio->uio_offset >= 0 and uio->uio_resid >= 0.
668 *
669 * If they've exceeded their filesize limit, tell them about it.
670 */
671 error = vn_rlimit_fsizex(vp, uio, MSDOSFS_FILESIZE_MAX, &r,
672 uio->uio_td);
673 if (error != 0) {
674 vn_rlimit_fsizex_res(uio, r);
675 return (error);
676 }
677
678 /*
679 * If the offset we are starting the write at is beyond the end of
680 * the file, then they've done a seek. Unix filesystems allow
681 * files with holes in them, DOS doesn't so we must fill the hole
682 * with zeroed blocks.
683 */
684 if (uio->uio_offset > dep->de_FileSize) {
685 error = deextend(dep, uio->uio_offset, cred);
686 if (error != 0) {
687 vn_rlimit_fsizex_res(uio, r);
688 return (error);
689 }
690 }
691
692 /*
693 * Remember some values in case the write fails.
694 */
695 resid = uio->uio_resid;
696 osize = dep->de_FileSize;
697
698 /*
699 * If we write beyond the end of the file, extend it to its ultimate
700 * size ahead of the time to hopefully get a contiguous area.
701 */
702 if (uio->uio_offset + resid > osize) {
703 count = de_clcount(pmp, uio->uio_offset + resid) -
704 de_clcount(pmp, osize);
705 error = extendfile(dep, count, NULL, NULL, 0);
706 if (error && (error != ENOSPC || (ioflag & IO_UNIT)))
707 goto errexit;
708 lastcn = dep->de_fc[FC_LASTFC].fc_frcn;
709 } else
710 lastcn = de_clcount(pmp, osize) - 1;
711
712 seqcount = ioflag >> IO_SEQSHIFT;
713 do {
714 if (de_cluster(pmp, uio->uio_offset) > lastcn) {
715 error = ENOSPC;
716 break;
717 }
718
719 croffset = uio->uio_offset & pmp->pm_crbomask;
720 n = min(uio->uio_resid, pmp->pm_bpcluster - croffset);
721 if (uio->uio_offset + n > dep->de_FileSize) {
722 dep->de_FileSize = uio->uio_offset + n;
723 /* The object size needs to be set before buffer is allocated */
724 vnode_pager_setsize(vp, dep->de_FileSize);
725 }
726
727 bn = de_cluster(pmp, uio->uio_offset);
728 if ((uio->uio_offset & pmp->pm_crbomask) == 0
729 && (de_cluster(pmp, uio->uio_offset + uio->uio_resid)
730 > de_cluster(pmp, uio->uio_offset)
731 || uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) {
732 /*
733 * If either the whole cluster gets written,
734 * or we write the cluster from its start beyond EOF,
735 * then no need to read data from disk.
736 */
737 bp = getblk(thisvp, bn, pmp->pm_bpcluster, 0, 0, 0);
738 /*
739 * This call to vfs_bio_clrbuf() ensures that
740 * even if vn_io_fault_uiomove() below faults,
741 * garbage from the newly instantiated buffer
742 * is not exposed to the userspace via mmap().
743 */
744 vfs_bio_clrbuf(bp);
745 /*
746 * Do the bmap now, since pcbmap needs buffers
747 * for the FAT table. (see msdosfs_strategy)
748 */
749 if (bp->b_blkno == bp->b_lblkno) {
750 error = pcbmap(dep, bp->b_lblkno, &bn, 0, 0);
751 if (error)
752 bp->b_blkno = -1;
753 else
754 bp->b_blkno = bn;
755 }
756 if (bp->b_blkno == -1) {
757 brelse(bp);
758 if (!error)
759 error = EIO; /* XXX */
760 break;
761 }
762 } else {
763 /*
764 * The block we need to write into exists, so read it in.
765 */
766 error = bread(thisvp, bn, pmp->pm_bpcluster, cred, &bp);
767 if (error) {
768 break;
769 }
770 }
771
772 /*
773 * Should these vnode_pager_* functions be done on dir
774 * files?
775 */
776
777 /*
778 * Copy the data from user space into the buf header.
779 */
780 error = vn_io_fault_uiomove(bp->b_data + croffset, n, uio);
781 if (error) {
782 brelse(bp);
783 break;
784 }
785
786 /* Prepare for clustered writes in some else clauses. */
787 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0)
788 bp->b_flags |= B_CLUSTEROK;
789
790 /*
791 * If IO_SYNC, then each buffer is written synchronously.
792 * Otherwise, if we have a severe page deficiency then
793 * write the buffer asynchronously. Otherwise, if on a
794 * cluster boundary then write the buffer asynchronously,
795 * combining it with contiguous clusters if permitted and
796 * possible, since we don't expect more writes into this
797 * buffer soon. Otherwise, do a delayed write because we
798 * expect more writes into this buffer soon.
799 */
800 if (ioflag & IO_SYNC)
801 (void)bwrite(bp);
802 else if (vm_page_count_severe() || buf_dirty_count_severe())
803 bawrite(bp);
804 else if (n + croffset == pmp->pm_bpcluster) {
805 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0)
806 cluster_write(vp, bp, dep->de_FileSize,
807 seqcount, 0);
808 else
809 bawrite(bp);
810 } else
811 bdwrite(bp);
812 dep->de_flag |= DE_UPDATE;
813 } while (error == 0 && uio->uio_resid > 0);
814
815 /*
816 * If the write failed and they want us to, truncate the file back
817 * to the size it was before the write was attempted.
818 */
819 errexit:
820 if (error) {
821 if (ioflag & IO_UNIT) {
822 detrunc(dep, osize, ioflag & IO_SYNC, NOCRED);
823 uio->uio_offset -= resid - uio->uio_resid;
824 uio->uio_resid = resid;
825 } else {
826 detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC, NOCRED);
827 if (uio->uio_resid != resid)
828 error = 0;
829 }
830 } else if (ioflag & IO_SYNC)
831 error = deupdat(dep, 1);
832 vn_rlimit_fsizex_res(uio, r);
833 return (error);
834 }
835
836 /*
837 * Flush the blocks of a file to disk.
838 */
839 static int
msdosfs_fsync(struct vop_fsync_args * ap)840 msdosfs_fsync(struct vop_fsync_args *ap)
841 {
842 struct vnode *devvp;
843 int allerror, error;
844
845 vop_stdfsync(ap);
846
847 /*
848 * If the syncing request comes from fsync(2), sync the entire
849 * FAT and any other metadata that happens to be on devvp. We
850 * need this mainly for the FAT. We write the FAT sloppily, and
851 * syncing it all now is the best we can easily do to get all
852 * directory entries associated with the file (not just the file)
853 * fully synced. The other metadata includes critical metadata
854 * for all directory entries, but only in the MNT_ASYNC case. We
855 * will soon sync all metadata in the file's directory entry.
856 * Non-critical metadata for associated directory entries only
857 * gets synced accidentally, as in most file systems.
858 */
859 if (ap->a_waitfor != MNT_NOWAIT) {
860 devvp = VTODE(ap->a_vp)->de_pmp->pm_devvp;
861 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
862 allerror = VOP_FSYNC(devvp, MNT_WAIT, ap->a_td);
863 VOP_UNLOCK(devvp);
864 } else
865 allerror = 0;
866
867 error = deupdat(VTODE(ap->a_vp), ap->a_waitfor != MNT_NOWAIT);
868 if (allerror == 0)
869 allerror = error;
870 return (allerror);
871 }
872
873 static int
msdosfs_remove(struct vop_remove_args * ap)874 msdosfs_remove(struct vop_remove_args *ap)
875 {
876 struct denode *dep = VTODE(ap->a_vp);
877 struct denode *ddep = VTODE(ap->a_dvp);
878 int error;
879
880 if (ap->a_vp->v_type == VDIR)
881 error = EPERM;
882 else
883 error = removede(ddep, dep);
884 #ifdef MSDOSFS_DEBUG
885 printf("msdosfs_remove(), dep %p, v_usecount %d\n", dep, ap->a_vp->v_usecount);
886 #endif
887 return (error);
888 }
889
890 /*
891 * DOS filesystems don't know what links are.
892 */
893 static int
msdosfs_link(struct vop_link_args * ap)894 msdosfs_link(struct vop_link_args *ap)
895 {
896 return (EOPNOTSUPP);
897 }
898
899 /*
900 * Renames on files require moving the denode to a new hash queue since the
901 * denode's location is used to compute which hash queue to put the file
902 * in. Unless it is a rename in place. For example "mv a b".
903 *
904 * What follows is the basic algorithm:
905 *
906 * if (file move) {
907 * if (dest file exists) {
908 * remove dest file
909 * }
910 * if (dest and src in same directory) {
911 * rewrite name in existing directory slot
912 * } else {
913 * write new entry in dest directory
914 * update offset and dirclust in denode
915 * move denode to new hash chain
916 * clear old directory entry
917 * }
918 * } else {
919 * directory move
920 * if (dest directory exists) {
921 * if (dest is not empty) {
922 * return ENOTEMPTY
923 * }
924 * remove dest directory
925 * }
926 * if (dest and src in same directory) {
927 * rewrite name in existing entry
928 * } else {
929 * be sure dest is not a child of src directory
930 * write entry in dest directory
931 * update "." and ".." in moved directory
932 * clear old directory entry for moved directory
933 * }
934 * }
935 *
936 * On entry:
937 * source's parent directory is unlocked
938 * source file or directory is unlocked
939 * destination's parent directory is locked
940 * destination file or directory is locked if it exists
941 *
942 * On exit:
943 * all denodes should be released
944 */
945 static int
msdosfs_rename(struct vop_rename_args * ap)946 msdosfs_rename(struct vop_rename_args *ap)
947 {
948 struct vnode *fdvp, *fvp, *tdvp, *tvp, *vp;
949 struct componentname *fcnp, *tcnp;
950 struct denode *fdip, *fip, *tdip, *tip, *nip;
951 u_char toname[12], oldname[11];
952 u_long to_diroffset;
953 bool checkpath_locked, doingdirectory, newparent;
954 int error;
955 u_long cn, pcl, blkoff;
956 daddr_t bn, wait_scn, scn;
957 struct msdosfsmount *pmp;
958 struct direntry *dotdotp;
959 struct buf *bp;
960
961 tdvp = ap->a_tdvp;
962 fvp = ap->a_fvp;
963 fdvp = ap->a_fdvp;
964 tvp = ap->a_tvp;
965 tcnp = ap->a_tcnp;
966 fcnp = ap->a_fcnp;
967 pmp = VFSTOMSDOSFS(fdvp->v_mount);
968
969 #ifdef DIAGNOSTIC
970 if ((tcnp->cn_flags & HASBUF) == 0 ||
971 (fcnp->cn_flags & HASBUF) == 0)
972 panic("msdosfs_rename: no name");
973 #endif
974 /*
975 * Check for cross-device rename.
976 */
977 if (fvp->v_mount != tdvp->v_mount ||
978 (tvp != NULL && fvp->v_mount != tvp->v_mount)) {
979 error = EXDEV;
980 goto abortit;
981 }
982
983 /*
984 * If source and dest are the same, do nothing.
985 */
986 if (tvp == fvp) {
987 error = 0;
988 goto abortit;
989 }
990
991 /*
992 * When the target exists, both the directory
993 * and target vnodes are passed locked.
994 */
995 VOP_UNLOCK(tdvp);
996 if (tvp != NULL && tvp != tdvp)
997 VOP_UNLOCK(tvp);
998
999 checkpath_locked = false;
1000
1001 relock:
1002 doingdirectory = newparent = false;
1003
1004 error = vn_lock(fdvp, LK_EXCLUSIVE);
1005 if (error != 0)
1006 goto releout;
1007 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) {
1008 VOP_UNLOCK(fdvp);
1009 error = vn_lock(tdvp, LK_EXCLUSIVE);
1010 if (error != 0)
1011 goto releout;
1012 VOP_UNLOCK(tdvp);
1013 goto relock;
1014 }
1015
1016 error = msdosfs_lookup_ino(fdvp, NULL, fcnp, &scn, &blkoff);
1017 if (error != 0) {
1018 VOP_UNLOCK(fdvp);
1019 VOP_UNLOCK(tdvp);
1020 goto releout;
1021 }
1022 error = deget(pmp, scn, blkoff, LK_EXCLUSIVE | LK_NOWAIT, &nip);
1023 if (error != 0) {
1024 VOP_UNLOCK(fdvp);
1025 VOP_UNLOCK(tdvp);
1026 if (error != EBUSY)
1027 goto releout;
1028 error = deget(pmp, scn, blkoff, LK_EXCLUSIVE, &nip);
1029 if (error != 0)
1030 goto releout;
1031 vp = fvp;
1032 fvp = DETOV(nip);
1033 VOP_UNLOCK(fvp);
1034 vrele(vp);
1035 goto relock;
1036 }
1037 vrele(fvp);
1038 fvp = DETOV(nip);
1039
1040 error = msdosfs_lookup_ino(tdvp, NULL, tcnp, &scn, &blkoff);
1041 if (error != 0 && error != EJUSTRETURN) {
1042 VOP_UNLOCK(fdvp);
1043 VOP_UNLOCK(tdvp);
1044 VOP_UNLOCK(fvp);
1045 goto releout;
1046 }
1047 if (error == EJUSTRETURN && tvp != NULL) {
1048 vrele(tvp);
1049 tvp = NULL;
1050 }
1051 if (error == 0) {
1052 nip = NULL;
1053 error = deget(pmp, scn, blkoff, LK_EXCLUSIVE | LK_NOWAIT,
1054 &nip);
1055 if (tvp != NULL) {
1056 vrele(tvp);
1057 tvp = NULL;
1058 }
1059 if (error != 0) {
1060 VOP_UNLOCK(fdvp);
1061 VOP_UNLOCK(tdvp);
1062 VOP_UNLOCK(fvp);
1063 if (error != EBUSY)
1064 goto releout;
1065 error = deget(pmp, scn, blkoff, LK_EXCLUSIVE,
1066 &nip);
1067 if (error != 0)
1068 goto releout;
1069 vput(DETOV(nip));
1070 goto relock;
1071 }
1072 tvp = DETOV(nip);
1073 }
1074
1075 fdip = VTODE(fdvp);
1076 fip = VTODE(fvp);
1077 tdip = VTODE(tdvp);
1078 tip = tvp != NULL ? VTODE(tvp) : NULL;
1079
1080 /*
1081 * Remember direntry place to use for destination
1082 */
1083 to_diroffset = tdip->de_fndoffset;
1084
1085 /*
1086 * Be sure we are not renaming ".", "..", or an alias of ".". This
1087 * leads to a crippled directory tree. It's pretty tough to do a
1088 * "ls" or "pwd" with the "." directory entry missing, and "cd .."
1089 * doesn't work if the ".." entry is missing.
1090 */
1091 if ((fip->de_Attributes & ATTR_DIRECTORY) != 0) {
1092 /*
1093 * Avoid ".", "..", and aliases of "." for obvious reasons.
1094 */
1095 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
1096 fdip == fip ||
1097 (fcnp->cn_flags & ISDOTDOT) != 0 ||
1098 (tcnp->cn_flags & ISDOTDOT) != 0) {
1099 error = EINVAL;
1100 goto unlock;
1101 }
1102 doingdirectory = true;
1103 }
1104
1105 /*
1106 * If ".." must be changed (ie the directory gets a new
1107 * parent) then the source directory must not be in the
1108 * directory hierarchy above the target, as this would
1109 * orphan everything below the source directory. Also
1110 * the user must have write permission in the source so
1111 * as to be able to change "..". We must repeat the call
1112 * to namei, as the parent directory is unlocked by the
1113 * call to doscheckpath().
1114 */
1115 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread);
1116 if (fdip->de_StartCluster != tdip->de_StartCluster)
1117 newparent = true;
1118 if (doingdirectory && newparent) {
1119 if (error != 0) /* write access check above */
1120 goto unlock;
1121 lockmgr(&pmp->pm_checkpath_lock, LK_EXCLUSIVE, NULL);
1122 checkpath_locked = true;
1123 error = doscheckpath(fip, tdip, &wait_scn);
1124 if (wait_scn != 0) {
1125 lockmgr(&pmp->pm_checkpath_lock, LK_RELEASE, NULL);
1126 checkpath_locked = false;
1127 VOP_UNLOCK(fdvp);
1128 VOP_UNLOCK(tdvp);
1129 VOP_UNLOCK(fvp);
1130 if (tvp != NULL && tvp != tdvp)
1131 VOP_UNLOCK(tvp);
1132 error = deget(pmp, wait_scn, 0, LK_EXCLUSIVE,
1133 &nip);
1134 if (error == 0) {
1135 vput(DETOV(nip));
1136 goto relock;
1137 }
1138 }
1139 if (error != 0)
1140 goto unlock;
1141 if ((tcnp->cn_flags & SAVESTART) == 0)
1142 panic("msdosfs_rename: lost to startdir");
1143 }
1144
1145 if (tip != NULL) {
1146 /*
1147 * Target must be empty if a directory and have no links
1148 * to it. Also, ensure source and target are compatible
1149 * (both directories, or both not directories).
1150 */
1151 if ((tip->de_Attributes & ATTR_DIRECTORY) != 0) {
1152 if (!dosdirempty(tip)) {
1153 error = ENOTEMPTY;
1154 goto unlock;
1155 }
1156 if (!doingdirectory) {
1157 error = ENOTDIR;
1158 goto unlock;
1159 }
1160 cache_purge(tdvp);
1161 } else if (doingdirectory) {
1162 error = EISDIR;
1163 goto unlock;
1164 }
1165 error = msdosfs_lookup_ino(tdvp, NULL, tcnp, &scn, &blkoff);
1166 MPASS(error == 0);
1167 error = removede(tdip, tip);
1168 if (error != 0)
1169 goto unlock;
1170 vput(tvp);
1171 tvp = NULL;
1172 tip = NULL;
1173 }
1174
1175 /*
1176 * Convert the filename in tcnp into a dos filename. We copy this
1177 * into the denode and directory entry for the destination
1178 * file/directory.
1179 */
1180 error = uniqdosname(tdip, tcnp, toname);
1181 if (error != 0)
1182 goto unlock;
1183
1184 /*
1185 * First write a new entry in the destination
1186 * directory and mark the entry in the source directory
1187 * as deleted. Then move the denode to the correct hash
1188 * chain for its new location in the filesystem. And, if
1189 * we moved a directory, then update its .. entry to point
1190 * to the new parent directory.
1191 */
1192 memcpy(oldname, fip->de_Name, 11);
1193 memcpy(fip->de_Name, toname, 11); /* update denode */
1194 error = msdosfs_lookup_ino(tdvp, NULL, tcnp, &scn, &blkoff);
1195 if (error == EJUSTRETURN) {
1196 tdip->de_fndoffset = to_diroffset;
1197 error = createde(fip, tdip, NULL, tcnp);
1198 }
1199 if (error != 0) {
1200 memcpy(fip->de_Name, oldname, 11);
1201 goto unlock;
1202 }
1203
1204 /*
1205 * If fip is for a directory, then its name should always
1206 * be "." since it is for the directory entry in the
1207 * directory itself (msdosfs_lookup() always translates
1208 * to the "." entry so as to get a unique denode, except
1209 * for the root directory there are different
1210 * complications). However, we just corrupted its name
1211 * to pass the correct name to createde(). Undo this.
1212 */
1213 if ((fip->de_Attributes & ATTR_DIRECTORY) != 0)
1214 memcpy(fip->de_Name, oldname, 11);
1215 fip->de_refcnt++;
1216 error = msdosfs_lookup_ino(fdvp, NULL, fcnp, &scn, &blkoff);
1217 MPASS(error == 0);
1218 error = removede(fdip, fip);
1219 if (error != 0) {
1220 printf("%s: removede %s %s err %d\n",
1221 pmp->pm_mountp->mnt_stat.f_mntonname,
1222 fdip->de_Name, fip->de_Name, error);
1223 msdosfs_integrity_error(pmp);
1224 goto unlock;
1225 }
1226 if (!doingdirectory) {
1227 error = pcbmap(tdip, de_cluster(pmp, to_diroffset), 0,
1228 &fip->de_dirclust, 0);
1229 if (error != 0) {
1230 /*
1231 * XXX should downgrade to ro here,
1232 * fs is corrupt
1233 */
1234 goto unlock;
1235 }
1236 if (fip->de_dirclust == MSDOSFSROOT)
1237 fip->de_diroffset = to_diroffset;
1238 else
1239 fip->de_diroffset = to_diroffset & pmp->pm_crbomask;
1240 }
1241 reinsert(fip);
1242
1243 /*
1244 * If we moved a directory to a new parent directory, then we must
1245 * fixup the ".." entry in the moved directory.
1246 */
1247 if (doingdirectory && newparent) {
1248 cn = fip->de_StartCluster;
1249 if (cn == MSDOSFSROOT) {
1250 /* this should never happen */
1251 panic("msdosfs_rename(): updating .. in root directory?");
1252 } else
1253 bn = cntobn(pmp, cn);
1254 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster,
1255 NOCRED, &bp);
1256 if (error != 0) {
1257 printf("%s: block read error %d while renaming dir\n",
1258 pmp->pm_mountp->mnt_stat.f_mntonname,
1259 error);
1260 msdosfs_integrity_error(pmp);
1261 goto unlock;
1262 }
1263 dotdotp = (struct direntry *)bp->b_data + 1;
1264 pcl = tdip->de_StartCluster;
1265 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk)
1266 pcl = MSDOSFSROOT;
1267 putushort(dotdotp->deStartCluster, pcl);
1268 if (FAT32(pmp))
1269 putushort(dotdotp->deHighClust, pcl >> 16);
1270 if (DOINGASYNC(fvp))
1271 bdwrite(bp);
1272 else if ((error = bwrite(bp)) != 0) {
1273 printf("%s: block write error %d while renaming dir\n",
1274 pmp->pm_mountp->mnt_stat.f_mntonname,
1275 error);
1276 msdosfs_integrity_error(pmp);
1277 goto unlock;
1278 }
1279 }
1280
1281 /*
1282 * The msdosfs lookup is case insensitive. Several aliases may
1283 * be inserted for a single directory entry. As a consequnce,
1284 * name cache purge done by lookup for fvp when DELETE op for
1285 * namei is specified, might be not enough to expunge all
1286 * namecache entries that were installed for this direntry.
1287 */
1288 cache_purge(fvp);
1289
1290 unlock:
1291 if (checkpath_locked)
1292 lockmgr(&pmp->pm_checkpath_lock, LK_RELEASE, NULL);
1293 vput(fdvp);
1294 vput(fvp);
1295 if (tvp != NULL) {
1296 if (tvp != tdvp)
1297 vput(tvp);
1298 else
1299 vrele(tvp);
1300 }
1301 vput(tdvp);
1302 return (error);
1303 releout:
1304 MPASS(!checkpath_locked);
1305 vrele(tdvp);
1306 if (tvp != NULL)
1307 vrele(tvp);
1308 vrele(fdvp);
1309 vrele(fvp);
1310 return (error);
1311 abortit:
1312 if (tdvp == tvp)
1313 vrele(tdvp);
1314 else
1315 vput(tdvp);
1316 if (tvp != NULL)
1317 vput(tvp);
1318 vrele(fdvp);
1319 vrele(fvp);
1320 return (error);
1321 }
1322
1323 static struct {
1324 struct direntry dot;
1325 struct direntry dotdot;
1326 } dosdirtemplate = {
1327 { ". ", /* the . entry */
1328 ATTR_DIRECTORY, /* file attribute */
1329 0, /* reserved */
1330 0, { 0, 0 }, { 0, 0 }, /* create time & date */
1331 { 0, 0 }, /* access date */
1332 { 0, 0 }, /* high bits of start cluster */
1333 { 210, 4 }, { 210, 4 }, /* modify time & date */
1334 { 0, 0 }, /* startcluster */
1335 { 0, 0, 0, 0 } /* filesize */
1336 },
1337 { ".. ", /* the .. entry */
1338 ATTR_DIRECTORY, /* file attribute */
1339 0, /* reserved */
1340 0, { 0, 0 }, { 0, 0 }, /* create time & date */
1341 { 0, 0 }, /* access date */
1342 { 0, 0 }, /* high bits of start cluster */
1343 { 210, 4 }, { 210, 4 }, /* modify time & date */
1344 { 0, 0 }, /* startcluster */
1345 { 0, 0, 0, 0 } /* filesize */
1346 }
1347 };
1348
1349 static int
msdosfs_mkdir(struct vop_mkdir_args * ap)1350 msdosfs_mkdir(struct vop_mkdir_args *ap)
1351 {
1352 struct componentname *cnp = ap->a_cnp;
1353 struct denode *dep;
1354 struct denode *pdep = VTODE(ap->a_dvp);
1355 struct direntry *denp;
1356 struct msdosfsmount *pmp = pdep->de_pmp;
1357 struct buf *bp;
1358 u_long newcluster, pcl;
1359 int bn;
1360 int error;
1361 struct denode ndirent;
1362 struct timespec ts;
1363
1364 /*
1365 * If this is the root directory and there is no space left we
1366 * can't do anything. This is because the root directory can not
1367 * change size.
1368 */
1369 if (pdep->de_StartCluster == MSDOSFSROOT
1370 && pdep->de_fndoffset >= pdep->de_FileSize) {
1371 error = ENOSPC;
1372 goto bad2;
1373 }
1374
1375 /*
1376 * Allocate a cluster to hold the about to be created directory.
1377 */
1378 error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL);
1379 if (error)
1380 goto bad2;
1381
1382 memset(&ndirent, 0, sizeof(ndirent));
1383 ndirent.de_pmp = pmp;
1384 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE;
1385 vfs_timestamp(&ts);
1386 DETIMES(&ndirent, &ts, &ts, &ts);
1387
1388 /*
1389 * Now fill the cluster with the "." and ".." entries. And write
1390 * the cluster to disk. This way it is there for the parent
1391 * directory to be pointing at if there were a crash.
1392 */
1393 bn = cntobn(pmp, newcluster);
1394 /* always succeeds */
1395 bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0, 0);
1396 memset(bp->b_data, 0, pmp->pm_bpcluster);
1397 memcpy(bp->b_data, &dosdirtemplate, sizeof dosdirtemplate);
1398 denp = (struct direntry *)bp->b_data;
1399 putushort(denp[0].deStartCluster, newcluster);
1400 putushort(denp[0].deCDate, ndirent.de_CDate);
1401 putushort(denp[0].deCTime, ndirent.de_CTime);
1402 denp[0].deCHundredth = ndirent.de_CHun;
1403 putushort(denp[0].deADate, ndirent.de_ADate);
1404 putushort(denp[0].deMDate, ndirent.de_MDate);
1405 putushort(denp[0].deMTime, ndirent.de_MTime);
1406 pcl = pdep->de_StartCluster;
1407 /*
1408 * Although the root directory has a non-magic starting cluster
1409 * number for FAT32, chkdsk and fsck_msdosfs still require
1410 * references to it in dotdot entries to be magic.
1411 */
1412 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk)
1413 pcl = MSDOSFSROOT;
1414 putushort(denp[1].deStartCluster, pcl);
1415 putushort(denp[1].deCDate, ndirent.de_CDate);
1416 putushort(denp[1].deCTime, ndirent.de_CTime);
1417 denp[1].deCHundredth = ndirent.de_CHun;
1418 putushort(denp[1].deADate, ndirent.de_ADate);
1419 putushort(denp[1].deMDate, ndirent.de_MDate);
1420 putushort(denp[1].deMTime, ndirent.de_MTime);
1421 if (FAT32(pmp)) {
1422 putushort(denp[0].deHighClust, newcluster >> 16);
1423 putushort(denp[1].deHighClust, pcl >> 16);
1424 }
1425
1426 if (DOINGASYNC(ap->a_dvp))
1427 bdwrite(bp);
1428 else if ((error = bwrite(bp)) != 0)
1429 goto bad;
1430
1431 /*
1432 * Now build up a directory entry pointing to the newly allocated
1433 * cluster. This will be written to an empty slot in the parent
1434 * directory.
1435 */
1436 #ifdef DIAGNOSTIC
1437 if ((cnp->cn_flags & HASBUF) == 0)
1438 panic("msdosfs_mkdir: no name");
1439 #endif
1440 error = uniqdosname(pdep, cnp, ndirent.de_Name);
1441 if (error)
1442 goto bad;
1443
1444 ndirent.de_Attributes = ATTR_DIRECTORY;
1445 ndirent.de_LowerCase = 0;
1446 ndirent.de_StartCluster = newcluster;
1447 ndirent.de_FileSize = 0;
1448 error = createde(&ndirent, pdep, &dep, cnp);
1449 if (error)
1450 goto bad;
1451 *ap->a_vpp = DETOV(dep);
1452 return (0);
1453
1454 bad:
1455 clusterfree(pmp, newcluster);
1456 bad2:
1457 return (error);
1458 }
1459
1460 static int
msdosfs_rmdir(struct vop_rmdir_args * ap)1461 msdosfs_rmdir(struct vop_rmdir_args *ap)
1462 {
1463 struct vnode *vp = ap->a_vp;
1464 struct vnode *dvp = ap->a_dvp;
1465 struct componentname *cnp = ap->a_cnp;
1466 struct denode *ip, *dp;
1467 int error;
1468
1469 ip = VTODE(vp);
1470 dp = VTODE(dvp);
1471
1472 /*
1473 * Verify the directory is empty (and valid).
1474 * (Rmdir ".." won't be valid since
1475 * ".." will contain a reference to
1476 * the current directory and thus be
1477 * non-empty.)
1478 */
1479 error = 0;
1480 if (!dosdirempty(ip)) {
1481 error = ENOTEMPTY;
1482 goto out;
1483 }
1484 /*
1485 * Delete the entry from the directory. For dos filesystems this
1486 * gets rid of the directory entry on disk, the in memory copy
1487 * still exists but the de_refcnt is <= 0. This prevents it from
1488 * being found by deget(). When the vput() on dep is done we give
1489 * up access and eventually msdosfs_reclaim() will be called which
1490 * will remove it from the denode cache.
1491 */
1492 error = removede(dp, ip);
1493 if (error)
1494 goto out;
1495 /*
1496 * This is where we decrement the link count in the parent
1497 * directory. Since dos filesystems don't do this we just purge
1498 * the name cache.
1499 */
1500 cache_purge(dvp);
1501 /*
1502 * Truncate the directory that is being deleted.
1503 */
1504 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred);
1505 cache_purge(vp);
1506
1507 out:
1508 return (error);
1509 }
1510
1511 /*
1512 * DOS filesystems don't know what symlinks are.
1513 */
1514 static int
msdosfs_symlink(struct vop_symlink_args * ap)1515 msdosfs_symlink(struct vop_symlink_args *ap)
1516 {
1517 return (EOPNOTSUPP);
1518 }
1519
1520 static int
msdosfs_readdir(struct vop_readdir_args * ap)1521 msdosfs_readdir(struct vop_readdir_args *ap)
1522 {
1523 struct mbnambuf nb;
1524 int error = 0;
1525 int diff;
1526 long n;
1527 int blsize;
1528 long on;
1529 u_long cn;
1530 u_long dirsperblk;
1531 long bias = 0;
1532 daddr_t bn, lbn;
1533 struct buf *bp;
1534 struct denode *dep = VTODE(ap->a_vp);
1535 struct msdosfsmount *pmp = dep->de_pmp;
1536 struct direntry *dentp;
1537 struct dirent dirbuf;
1538 struct uio *uio = ap->a_uio;
1539 u_long *cookies = NULL;
1540 int ncookies = 0;
1541 off_t offset, off;
1542 int chksum = -1;
1543
1544 #ifdef MSDOSFS_DEBUG
1545 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n",
1546 ap->a_vp, uio, ap->a_cred, ap->a_eofflag);
1547 #endif
1548
1549 /*
1550 * msdosfs_readdir() won't operate properly on regular files since
1551 * it does i/o only with the filesystem vnode, and hence can
1552 * retrieve the wrong block from the buffer cache for a plain file.
1553 * So, fail attempts to readdir() on a plain file.
1554 */
1555 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0)
1556 return (ENOTDIR);
1557
1558 /*
1559 * To be safe, initialize dirbuf
1560 */
1561 memset(dirbuf.d_name, 0, sizeof(dirbuf.d_name));
1562
1563 /*
1564 * If the user buffer is smaller than the size of one dos directory
1565 * entry or the file offset is not a multiple of the size of a
1566 * directory entry, then we fail the read.
1567 */
1568 off = offset = uio->uio_offset;
1569 if (uio->uio_resid < sizeof(struct direntry) ||
1570 (offset & (sizeof(struct direntry) - 1)))
1571 return (EINVAL);
1572
1573 if (ap->a_ncookies) {
1574 ncookies = uio->uio_resid / 16;
1575 cookies = malloc(ncookies * sizeof(u_long), M_TEMP,
1576 M_WAITOK);
1577 *ap->a_cookies = cookies;
1578 *ap->a_ncookies = ncookies;
1579 }
1580
1581 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry);
1582
1583 /*
1584 * If they are reading from the root directory then, we simulate
1585 * the . and .. entries since these don't exist in the root
1586 * directory. We also set the offset bias to make up for having to
1587 * simulate these entries. By this I mean that at file offset 64 we
1588 * read the first entry in the root directory that lives on disk.
1589 */
1590 if (dep->de_StartCluster == MSDOSFSROOT
1591 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) {
1592 #if 0
1593 printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n",
1594 offset);
1595 #endif
1596 bias = 2 * sizeof(struct direntry);
1597 if (offset < bias) {
1598 for (n = (int)offset / sizeof(struct direntry);
1599 n < 2; n++) {
1600 dirbuf.d_fileno = FAT32(pmp) ?
1601 (uint64_t)cntobn(pmp, pmp->pm_rootdirblk) *
1602 dirsperblk : 1;
1603 dirbuf.d_type = DT_DIR;
1604 switch (n) {
1605 case 0:
1606 dirbuf.d_namlen = 1;
1607 dirbuf.d_name[0] = '.';
1608 break;
1609 case 1:
1610 dirbuf.d_namlen = 2;
1611 dirbuf.d_name[0] = '.';
1612 dirbuf.d_name[1] = '.';
1613 break;
1614 }
1615 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf);
1616 /* NOTE: d_off is the offset of the *next* entry. */
1617 dirbuf.d_off = offset + sizeof(struct direntry);
1618 dirent_terminate(&dirbuf);
1619 if (uio->uio_resid < dirbuf.d_reclen)
1620 goto out;
1621 error = uiomove(&dirbuf, dirbuf.d_reclen, uio);
1622 if (error)
1623 goto out;
1624 offset += sizeof(struct direntry);
1625 off = offset;
1626 if (cookies) {
1627 *cookies++ = offset;
1628 if (--ncookies <= 0)
1629 goto out;
1630 }
1631 }
1632 }
1633 }
1634
1635 mbnambuf_init(&nb);
1636 off = offset;
1637 while (uio->uio_resid > 0) {
1638 lbn = de_cluster(pmp, offset - bias);
1639 on = (offset - bias) & pmp->pm_crbomask;
1640 n = min(pmp->pm_bpcluster - on, uio->uio_resid);
1641 diff = dep->de_FileSize - (offset - bias);
1642 if (diff <= 0)
1643 break;
1644 n = min(n, diff);
1645 error = pcbmap(dep, lbn, &bn, &cn, &blsize);
1646 if (error)
1647 break;
1648 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp);
1649 if (error) {
1650 return (error);
1651 }
1652 n = min(n, blsize - bp->b_resid);
1653 if (n == 0) {
1654 brelse(bp);
1655 return (EIO);
1656 }
1657
1658 /*
1659 * Convert from dos directory entries to fs-independent
1660 * directory entries.
1661 */
1662 for (dentp = (struct direntry *)(bp->b_data + on);
1663 (char *)dentp < bp->b_data + on + n;
1664 dentp++, offset += sizeof(struct direntry)) {
1665 #if 0
1666 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n",
1667 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes);
1668 #endif
1669 /*
1670 * If this is an unused entry, we can stop.
1671 */
1672 if (dentp->deName[0] == SLOT_EMPTY) {
1673 brelse(bp);
1674 goto out;
1675 }
1676 /*
1677 * Skip deleted entries.
1678 */
1679 if (dentp->deName[0] == SLOT_DELETED) {
1680 chksum = -1;
1681 mbnambuf_init(&nb);
1682 continue;
1683 }
1684
1685 /*
1686 * Handle Win95 long directory entries
1687 */
1688 if (dentp->deAttributes == ATTR_WIN95) {
1689 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME)
1690 continue;
1691 chksum = win2unixfn(&nb,
1692 (struct winentry *)dentp, chksum, pmp);
1693 continue;
1694 }
1695
1696 /*
1697 * Skip volume labels
1698 */
1699 if (dentp->deAttributes & ATTR_VOLUME) {
1700 chksum = -1;
1701 mbnambuf_init(&nb);
1702 continue;
1703 }
1704 /*
1705 * This computation of d_fileno must match
1706 * the computation of va_fileid in
1707 * msdosfs_getattr.
1708 */
1709 if (dentp->deAttributes & ATTR_DIRECTORY) {
1710 cn = getushort(dentp->deStartCluster);
1711 if (FAT32(pmp)) {
1712 cn |= getushort(dentp->deHighClust) <<
1713 16;
1714 if (cn == MSDOSFSROOT)
1715 cn = pmp->pm_rootdirblk;
1716 }
1717 if (cn == MSDOSFSROOT && !FAT32(pmp))
1718 dirbuf.d_fileno = 1;
1719 else
1720 dirbuf.d_fileno = cntobn(pmp, cn) *
1721 dirsperblk;
1722 dirbuf.d_type = DT_DIR;
1723 } else {
1724 dirbuf.d_fileno = (uoff_t)offset /
1725 sizeof(struct direntry);
1726 dirbuf.d_type = DT_REG;
1727 }
1728
1729 if (chksum != winChksum(dentp->deName)) {
1730 dirbuf.d_namlen = dos2unixfn(dentp->deName,
1731 (u_char *)dirbuf.d_name,
1732 dentp->deLowerCase |
1733 ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ?
1734 (LCASE_BASE | LCASE_EXT) : 0),
1735 pmp);
1736 mbnambuf_init(&nb);
1737 } else
1738 mbnambuf_flush(&nb, &dirbuf);
1739 chksum = -1;
1740 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf);
1741 /* NOTE: d_off is the offset of the *next* entry. */
1742 dirbuf.d_off = offset + sizeof(struct direntry);
1743 dirent_terminate(&dirbuf);
1744 if (uio->uio_resid < dirbuf.d_reclen) {
1745 brelse(bp);
1746 goto out;
1747 }
1748 error = uiomove(&dirbuf, dirbuf.d_reclen, uio);
1749 if (error) {
1750 brelse(bp);
1751 goto out;
1752 }
1753 if (cookies) {
1754 *cookies++ = offset + sizeof(struct direntry);
1755 if (--ncookies <= 0) {
1756 brelse(bp);
1757 goto out;
1758 }
1759 }
1760 off = offset + sizeof(struct direntry);
1761 }
1762 brelse(bp);
1763 }
1764 out:
1765 /* Subtract unused cookies */
1766 if (ap->a_ncookies)
1767 *ap->a_ncookies -= ncookies;
1768
1769 uio->uio_offset = off;
1770
1771 /*
1772 * Set the eofflag (NFS uses it)
1773 */
1774 if (ap->a_eofflag) {
1775 if (dep->de_FileSize - (offset - bias) <= 0)
1776 *ap->a_eofflag = 1;
1777 else
1778 *ap->a_eofflag = 0;
1779 }
1780 return (error);
1781 }
1782
1783 /*-
1784 * a_vp - pointer to the file's vnode
1785 * a_bn - logical block number within the file (cluster number for us)
1786 * a_bop - where to return the bufobj of the special file containing the fs
1787 * a_bnp - where to return the "physical" block number corresponding to a_bn
1788 * (relative to the special file; units are blocks of size DEV_BSIZE)
1789 * a_runp - where to return the "run past" a_bn. This is the count of logical
1790 * blocks whose physical blocks (together with a_bn's physical block)
1791 * are contiguous.
1792 * a_runb - where to return the "run before" a_bn.
1793 */
1794 static int
msdosfs_bmap(struct vop_bmap_args * ap)1795 msdosfs_bmap(struct vop_bmap_args *ap)
1796 {
1797 struct fatcache savefc;
1798 struct denode *dep;
1799 struct mount *mp;
1800 struct msdosfsmount *pmp;
1801 struct vnode *vp;
1802 daddr_t runbn;
1803 u_long cn;
1804 int bnpercn, error, maxio, maxrun, run;
1805
1806 vp = ap->a_vp;
1807 dep = VTODE(vp);
1808 pmp = dep->de_pmp;
1809 if (ap->a_bop != NULL)
1810 *ap->a_bop = &pmp->pm_devvp->v_bufobj;
1811 if (ap->a_bnp == NULL)
1812 return (0);
1813 if (ap->a_runp != NULL)
1814 *ap->a_runp = 0;
1815 if (ap->a_runb != NULL)
1816 *ap->a_runb = 0;
1817 cn = ap->a_bn;
1818 if (cn != ap->a_bn)
1819 return (EFBIG);
1820 error = pcbmap(dep, cn, ap->a_bnp, NULL, NULL);
1821 if (error != 0 || (ap->a_runp == NULL && ap->a_runb == NULL))
1822 return (error);
1823
1824 /*
1825 * Prepare to back out updates of the fatchain cache after the one
1826 * for the first block done by pcbmap() above. Without the backout,
1827 * then whenever the caller doesn't do i/o to all of the blocks that
1828 * we find, the single useful cache entry would be too far in advance
1829 * of the actual i/o to work for the next sequential i/o. Then the
1830 * FAT would be searched from the beginning. With the backout, the
1831 * FAT is searched starting at most a few blocks early. This wastes
1832 * much less time. Time is also wasted finding more blocks than the
1833 * caller will do i/o to. This is necessary because the runlength
1834 * parameters are output-only.
1835 */
1836 savefc = dep->de_fc[FC_LASTMAP];
1837
1838 mp = vp->v_mount;
1839 maxio = mp->mnt_iosize_max / mp->mnt_stat.f_iosize;
1840 bnpercn = de_cn2bn(pmp, 1);
1841 if (ap->a_runp != NULL) {
1842 maxrun = ulmin(maxio - 1, pmp->pm_maxcluster - cn);
1843 for (run = 1; run <= maxrun; run++) {
1844 if (pcbmap(dep, cn + run, &runbn, NULL, NULL) != 0 ||
1845 runbn != *ap->a_bnp + run * bnpercn)
1846 break;
1847 }
1848 *ap->a_runp = run - 1;
1849 }
1850 if (ap->a_runb != NULL) {
1851 maxrun = ulmin(maxio - 1, cn);
1852 for (run = 1; run < maxrun; run++) {
1853 if (pcbmap(dep, cn - run, &runbn, NULL, NULL) != 0 ||
1854 runbn != *ap->a_bnp - run * bnpercn)
1855 break;
1856 }
1857 *ap->a_runb = run - 1;
1858 }
1859 dep->de_fc[FC_LASTMAP] = savefc;
1860 return (0);
1861 }
1862
1863 SYSCTL_NODE(_vfs, OID_AUTO, msdosfs, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
1864 "msdos filesystem");
1865 static int use_buf_pager = 1;
1866 SYSCTL_INT(_vfs_msdosfs, OID_AUTO, use_buf_pager, CTLFLAG_RWTUN,
1867 &use_buf_pager, 0,
1868 "Use buffer pager instead of bmap");
1869
1870 static daddr_t
msdosfs_gbp_getblkno(struct vnode * vp,vm_ooffset_t off)1871 msdosfs_gbp_getblkno(struct vnode *vp, vm_ooffset_t off)
1872 {
1873
1874 return (de_cluster(VTODE(vp)->de_pmp, off));
1875 }
1876
1877 static int
msdosfs_gbp_getblksz(struct vnode * vp,daddr_t lbn,long * sz)1878 msdosfs_gbp_getblksz(struct vnode *vp, daddr_t lbn, long *sz)
1879 {
1880
1881 *sz = VTODE(vp)->de_pmp->pm_bpcluster;
1882 return (0);
1883 }
1884
1885 static int
msdosfs_getpages(struct vop_getpages_args * ap)1886 msdosfs_getpages(struct vop_getpages_args *ap)
1887 {
1888
1889 if (use_buf_pager)
1890 return (vfs_bio_getpages(ap->a_vp, ap->a_m, ap->a_count,
1891 ap->a_rbehind, ap->a_rahead, msdosfs_gbp_getblkno,
1892 msdosfs_gbp_getblksz));
1893 return (vnode_pager_generic_getpages(ap->a_vp, ap->a_m, ap->a_count,
1894 ap->a_rbehind, ap->a_rahead, NULL, NULL));
1895 }
1896
1897 static int
msdosfs_strategy(struct vop_strategy_args * ap)1898 msdosfs_strategy(struct vop_strategy_args *ap)
1899 {
1900 struct buf *bp = ap->a_bp;
1901 struct denode *dep = VTODE(ap->a_vp);
1902 struct bufobj *bo;
1903 int error = 0;
1904 daddr_t blkno;
1905
1906 /*
1907 * If we don't already know the filesystem relative block number
1908 * then get it using pcbmap(). If pcbmap() returns the block
1909 * number as -1 then we've got a hole in the file. DOS filesystems
1910 * don't allow files with holes, so we shouldn't ever see this.
1911 */
1912 if (bp->b_blkno == bp->b_lblkno) {
1913 error = pcbmap(dep, bp->b_lblkno, &blkno, 0, 0);
1914 bp->b_blkno = blkno;
1915 if (error) {
1916 bp->b_error = error;
1917 bp->b_ioflags |= BIO_ERROR;
1918 bufdone(bp);
1919 return (0);
1920 }
1921 if ((long)bp->b_blkno == -1)
1922 vfs_bio_clrbuf(bp);
1923 }
1924 if (bp->b_blkno == -1) {
1925 bufdone(bp);
1926 return (0);
1927 }
1928 /*
1929 * Read/write the block from/to the disk that contains the desired
1930 * file block.
1931 */
1932 bp->b_iooffset = dbtob(bp->b_blkno);
1933 bo = dep->de_pmp->pm_bo;
1934 BO_STRATEGY(bo, bp);
1935 return (0);
1936 }
1937
1938 static int
msdosfs_print(struct vop_print_args * ap)1939 msdosfs_print(struct vop_print_args *ap)
1940 {
1941 struct denode *dep = VTODE(ap->a_vp);
1942
1943 printf("\tstartcluster %lu, dircluster %lu, diroffset %lu, ",
1944 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset);
1945 printf("on dev %s\n", devtoname(dep->de_pmp->pm_dev));
1946 return (0);
1947 }
1948
1949 static int
msdosfs_pathconf(struct vop_pathconf_args * ap)1950 msdosfs_pathconf(struct vop_pathconf_args *ap)
1951 {
1952 struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp;
1953
1954 switch (ap->a_name) {
1955 case _PC_FILESIZEBITS:
1956 *ap->a_retval = 32;
1957 return (0);
1958 case _PC_LINK_MAX:
1959 *ap->a_retval = 1;
1960 return (0);
1961 case _PC_NAME_MAX:
1962 *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12;
1963 return (0);
1964 case _PC_CHOWN_RESTRICTED:
1965 *ap->a_retval = 1;
1966 return (0);
1967 case _PC_NO_TRUNC:
1968 *ap->a_retval = 0;
1969 return (0);
1970 default:
1971 return (vop_stdpathconf(ap));
1972 }
1973 /* NOTREACHED */
1974 }
1975
1976 static int
msdosfs_vptofh(struct vop_vptofh_args * ap)1977 msdosfs_vptofh(struct vop_vptofh_args *ap)
1978 {
1979 struct denode *dep;
1980 struct defid *defhp;
1981
1982 dep = VTODE(ap->a_vp);
1983 defhp = (struct defid *)ap->a_fhp;
1984 defhp->defid_len = sizeof(struct defid);
1985 defhp->defid_dirclust = dep->de_dirclust;
1986 defhp->defid_dirofs = dep->de_diroffset;
1987 /* defhp->defid_gen = dep->de_gen; */
1988 return (0);
1989 }
1990
1991 /* Global vfs data structures for msdosfs */
1992 struct vop_vector msdosfs_vnodeops = {
1993 .vop_default = &default_vnodeops,
1994
1995 .vop_access = msdosfs_access,
1996 .vop_bmap = msdosfs_bmap,
1997 .vop_getpages = msdosfs_getpages,
1998 .vop_cachedlookup = msdosfs_lookup,
1999 .vop_open = msdosfs_open,
2000 .vop_close = msdosfs_close,
2001 .vop_create = msdosfs_create,
2002 .vop_fsync = msdosfs_fsync,
2003 .vop_fdatasync = vop_stdfdatasync_buf,
2004 .vop_getattr = msdosfs_getattr,
2005 .vop_inactive = msdosfs_inactive,
2006 .vop_link = msdosfs_link,
2007 .vop_lookup = vfs_cache_lookup,
2008 .vop_mkdir = msdosfs_mkdir,
2009 .vop_mknod = msdosfs_mknod,
2010 .vop_pathconf = msdosfs_pathconf,
2011 .vop_print = msdosfs_print,
2012 .vop_read = msdosfs_read,
2013 .vop_readdir = msdosfs_readdir,
2014 .vop_reclaim = msdosfs_reclaim,
2015 .vop_remove = msdosfs_remove,
2016 .vop_rename = msdosfs_rename,
2017 .vop_rmdir = msdosfs_rmdir,
2018 .vop_setattr = msdosfs_setattr,
2019 .vop_strategy = msdosfs_strategy,
2020 .vop_symlink = msdosfs_symlink,
2021 .vop_write = msdosfs_write,
2022 .vop_vptofh = msdosfs_vptofh,
2023 };
2024 VFS_VOP_VECTOR_REGISTER(msdosfs_vnodeops);
2025