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