Initial import from FreeBSD RELENG_4:
[dragonfly.git] / sys / vfs / msdosfs / msdosfs_vfsops.c
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1/* $FreeBSD: src/sys/msdosfs/msdosfs_vfsops.c,v 1.60.2.6 2002/09/12 21:33:38 trhodes Exp $ */
2/* $NetBSD: msdosfs_vfsops.c,v 1.51 1997/11/17 15:36:58 ws Exp $ */
3
4/*-
5 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
6 * Copyright (C) 1994, 1995, 1997 TooLs GmbH.
7 * All rights reserved.
8 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by TooLs GmbH.
21 * 4. The name of TooLs GmbH may not be used to endorse or promote products
22 * derived from this software without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
27 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
29 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
30 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
31 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
32 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
33 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35/*
36 * Written by Paul Popelka (paulp@uts.amdahl.com)
37 *
38 * You can do anything you want with this software, just don't say you wrote
39 * it, and don't remove this notice.
40 *
41 * This software is provided "as is".
42 *
43 * The author supplies this software to be publicly redistributed on the
44 * understanding that the author is not responsible for the correct
45 * functioning of this software in any circumstances and is not liable for
46 * any damages caused by this software.
47 *
48 * October 1992
49 */
50
51#include <sys/param.h>
52#include <sys/systm.h>
53#include <sys/conf.h>
54#include <sys/namei.h>
55#include <sys/proc.h>
56#include <sys/kernel.h>
57#include <sys/vnode.h>
58#include <sys/mount.h>
59#include <sys/buf.h>
60#include <sys/fcntl.h>
61#include <sys/malloc.h>
62#include <sys/stat.h> /* defines ALLPERMS */
63#include <vm/vm_zone.h>
64
65#include <msdosfs/bpb.h>
66#include <msdosfs/bootsect.h>
67#include <msdosfs/direntry.h>
68#include <msdosfs/denode.h>
69#include <msdosfs/msdosfsmount.h>
70#include <msdosfs/fat.h>
71
72#define MSDOSFS_DFLTBSIZE 4096
73
74#if 1 /*def PC98*/
75/*
76 * XXX - The boot signature formatted by NEC PC-98 DOS looks like a
77 * garbage or a random value :-{
78 * If you want to use that broken-signatured media, define the
79 * following symbol even though PC/AT.
80 * (ex. mount PC-98 DOS formatted FD on PC/AT)
81 */
82#define MSDOSFS_NOCHECKSIG
83#endif
84
85MALLOC_DEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOSFS mount structure");
86static MALLOC_DEFINE(M_MSDOSFSFAT, "MSDOSFS FAT", "MSDOSFS file allocation table");
87
88static int update_mp __P((struct mount *mp, struct msdosfs_args *argp));
89static int mountmsdosfs __P((struct vnode *devvp, struct mount *mp,
90 struct proc *p, struct msdosfs_args *argp));
91static int msdosfs_fhtovp __P((struct mount *, struct fid *,
92 struct vnode **));
93static int msdosfs_checkexp __P((struct mount *, struct sockaddr *,
94 int *, struct ucred **));
95static int msdosfs_mount __P((struct mount *, char *, caddr_t,
96 struct nameidata *, struct proc *));
97static int msdosfs_root __P((struct mount *, struct vnode **));
98static int msdosfs_statfs __P((struct mount *, struct statfs *,
99 struct proc *));
100static int msdosfs_sync __P((struct mount *, int, struct ucred *,
101 struct proc *));
102static int msdosfs_unmount __P((struct mount *, int, struct proc *));
103static int msdosfs_vptofh __P((struct vnode *, struct fid *));
104
105static int
106update_mp(mp, argp)
107 struct mount *mp;
108 struct msdosfs_args *argp;
109{
110 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
111 int error;
112
113 pmp->pm_gid = argp->gid;
114 pmp->pm_uid = argp->uid;
115 pmp->pm_mask = argp->mask & ALLPERMS;
116 pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT;
117 if (pmp->pm_flags & MSDOSFSMNT_U2WTABLE) {
118 bcopy(argp->u2w, pmp->pm_u2w, sizeof(pmp->pm_u2w));
119 bcopy(argp->d2u, pmp->pm_d2u, sizeof(pmp->pm_d2u));
120 bcopy(argp->u2d, pmp->pm_u2d, sizeof(pmp->pm_u2d));
121 }
122 if (pmp->pm_flags & MSDOSFSMNT_ULTABLE) {
123 bcopy(argp->ul, pmp->pm_ul, sizeof(pmp->pm_ul));
124 bcopy(argp->lu, pmp->pm_lu, sizeof(pmp->pm_lu));
125 }
126
127#ifndef __FreeBSD__
128 /*
129 * GEMDOS knows nothing (yet) about win95
130 */
131 if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS)
132 pmp->pm_flags |= MSDOSFSMNT_NOWIN95;
133#endif
134
135 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95)
136 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME;
137 else if (!(pmp->pm_flags &
138 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) {
139 struct vnode *rootvp;
140
141 /*
142 * Try to divine whether to support Win'95 long filenames
143 */
144 if (FAT32(pmp))
145 pmp->pm_flags |= MSDOSFSMNT_LONGNAME;
146 else {
147 if ((error = msdosfs_root(mp, &rootvp)) != 0)
148 return error;
149 pmp->pm_flags |= findwin95(VTODE(rootvp))
150 ? MSDOSFSMNT_LONGNAME
151 : MSDOSFSMNT_SHORTNAME;
152 vput(rootvp);
153 }
154 }
155 return 0;
156}
157
158#ifndef __FreeBSD__
159int
160msdosfs_mountroot()
161{
162 register struct mount *mp;
163 struct proc *p = curproc; /* XXX */
164 size_t size;
165 int error;
166 struct msdosfs_args args;
167
168 if (root_device->dv_class != DV_DISK)
169 return (ENODEV);
170
171 /*
172 * Get vnodes for swapdev and rootdev.
173 */
174 if (bdevvp(rootdev, &rootvp))
175 panic("msdosfs_mountroot: can't setup rootvp");
176
177 mp = malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK);
178 bzero((char *)mp, (u_long)sizeof(struct mount));
179 mp->mnt_op = &msdosfs_vfsops;
180 mp->mnt_flag = 0;
181 TAILQ_INIT(&mp->mnt_nvnodelist);
182 TAILQ_INIT(&mp->mnt_reservedvnlist);
183
184 args.flags = 0;
185 args.uid = 0;
186 args.gid = 0;
187 args.mask = 0777;
188
189 if ((error = mountmsdosfs(rootvp, mp, p, &args)) != 0) {
190 free(mp, M_MOUNT);
191 return (error);
192 }
193
194 if ((error = update_mp(mp, &args)) != 0) {
195 (void)msdosfs_unmount(mp, 0, p);
196 free(mp, M_MOUNT);
197 return (error);
198 }
199
200 if ((error = vfs_lock(mp)) != 0) {
201 (void)msdosfs_unmount(mp, 0, p);
202 free(mp, M_MOUNT);
203 return (error);
204 }
205
206 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
207 mp->mnt_vnodecovered = NULLVP;
208 (void) copystr("/", mp->mnt_stat.f_mntonname, MNAMELEN - 1,
209 &size);
210 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
211 (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
212 &size);
213 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
214 (void)msdosfs_statfs(mp, &mp->mnt_stat, p);
215 vfs_unlock(mp);
216 return (0);
217}
218#endif
219
220/*
221 * mp - path - addr in user space of mount point (ie /usr or whatever)
222 * data - addr in user space of mount params including the name of the block
223 * special file to treat as a filesystem.
224 */
225static int
226msdosfs_mount(mp, path, data, ndp, p)
227 struct mount *mp;
228 char *path;
229 caddr_t data;
230 struct nameidata *ndp;
231 struct proc *p;
232{
233 struct vnode *devvp; /* vnode for blk device to mount */
234 struct msdosfs_args args; /* will hold data from mount request */
235 /* msdosfs specific mount control block */
236 struct msdosfsmount *pmp = NULL;
237 size_t size;
238 int error, flags;
239 mode_t accessmode;
240
241 error = copyin(data, (caddr_t)&args, sizeof(struct msdosfs_args));
242 if (error)
243 return (error);
244 if (args.magic != MSDOSFS_ARGSMAGIC)
245 args.flags = 0;
246 /*
247 * If updating, check whether changing from read-only to
248 * read/write; if there is no device name, that's all we do.
249 */
250 if (mp->mnt_flag & MNT_UPDATE) {
251 pmp = VFSTOMSDOSFS(mp);
252 error = 0;
253 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) {
254 flags = WRITECLOSE;
255 if (mp->mnt_flag & MNT_FORCE)
256 flags |= FORCECLOSE;
257 error = vflush(mp, 0, flags);
258 }
259 if (!error && (mp->mnt_flag & MNT_RELOAD))
260 /* not yet implemented */
261 error = EOPNOTSUPP;
262 if (error)
263 return (error);
264 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
265 /*
266 * If upgrade to read-write by non-root, then verify
267 * that user has necessary permissions on the device.
268 */
269 if (p->p_ucred->cr_uid != 0) {
270 devvp = pmp->pm_devvp;
271 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p);
272 error = VOP_ACCESS(devvp, VREAD | VWRITE,
273 p->p_ucred, p);
274 if (error) {
275 VOP_UNLOCK(devvp, 0, p);
276 return (error);
277 }
278 VOP_UNLOCK(devvp, 0, p);
279 }
280 pmp->pm_flags &= ~MSDOSFSMNT_RONLY;
281 }
282 if (args.fspec == 0) {
283#ifdef __notyet__ /* doesn't work correctly with current mountd XXX */
284 if (args.flags & MSDOSFSMNT_MNTOPT) {
285 pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT;
286 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT;
287 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95)
288 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME;
289 }
290#endif
291 /*
292 * Process export requests.
293 */
294 return (vfs_export(mp, &pmp->pm_export, &args.export));
295 }
296 }
297 /*
298 * Not an update, or updating the name: look up the name
299 * and verify that it refers to a sensible block device.
300 */
301 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p);
302 error = namei(ndp);
303 if (error)
304 return (error);
305 devvp = ndp->ni_vp;
306 NDFREE(ndp, NDF_ONLY_PNBUF);
307
308 if (!vn_isdisk(devvp, &error)) {
309 vrele(devvp);
310 return (error);
311 }
312 /*
313 * If mount by non-root, then verify that user has necessary
314 * permissions on the device.
315 */
316 if (p->p_ucred->cr_uid != 0) {
317 accessmode = VREAD;
318 if ((mp->mnt_flag & MNT_RDONLY) == 0)
319 accessmode |= VWRITE;
320 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p);
321 error = VOP_ACCESS(devvp, accessmode, p->p_ucred, p);
322 if (error) {
323 vput(devvp);
324 return (error);
325 }
326 VOP_UNLOCK(devvp, 0, p);
327 }
328 if ((mp->mnt_flag & MNT_UPDATE) == 0) {
329 error = mountmsdosfs(devvp, mp, p, &args);
330#ifdef MSDOSFS_DEBUG /* only needed for the printf below */
331 pmp = VFSTOMSDOSFS(mp);
332#endif
333 } else {
334 if (devvp != pmp->pm_devvp)
335 error = EINVAL; /* XXX needs translation */
336 else
337 vrele(devvp);
338 }
339 if (error) {
340 vrele(devvp);
341 return (error);
342 }
343
344 error = update_mp(mp, &args);
345 if (error) {
346 msdosfs_unmount(mp, MNT_FORCE, p);
347 return error;
348 }
349
350 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
351 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
352 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
353 &size);
354 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
355 (void) msdosfs_statfs(mp, &mp->mnt_stat, p);
356#ifdef MSDOSFS_DEBUG
357 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap);
358#endif
359 return (0);
360}
361
362static int
363mountmsdosfs(devvp, mp, p, argp)
364 struct vnode *devvp;
365 struct mount *mp;
366 struct proc *p;
367 struct msdosfs_args *argp;
368{
369 struct msdosfsmount *pmp;
370 struct buf *bp;
371 dev_t dev = devvp->v_rdev;
372#ifndef __FreeBSD__
373 struct partinfo dpart;
374 int bsize = 0, dtype = 0, tmp;
375#endif
376 union bootsector *bsp;
377 struct byte_bpb33 *b33;
378 struct byte_bpb50 *b50;
379 struct byte_bpb710 *b710;
380 u_int8_t SecPerClust;
381 u_long clusters;
382 int ronly, error;
383
384 /*
385 * Disallow multiple mounts of the same device.
386 * Disallow mounting of a device that is currently in use
387 * (except for root, which might share swap device for miniroot).
388 * Flush out any old buffers remaining from a previous use.
389 */
390 error = vfs_mountedon(devvp);
391 if (error)
392 return (error);
393 if (vcount(devvp) > 1 && devvp != rootvp)
394 return (EBUSY);
395 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p);
396 error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0);
397 VOP_UNLOCK(devvp, 0, p);
398 if (error)
399 return (error);
400
401 ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
402 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p);
403 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p);
404 VOP_UNLOCK(devvp, 0, p);
405 if (error)
406 return (error);
407
408 bp = NULL; /* both used in error_exit */
409 pmp = NULL;
410
411#ifndef __FreeBSD__
412 if (argp->flags & MSDOSFSMNT_GEMDOSFS) {
413 /*
414 * We need the disklabel to calculate the size of a FAT entry
415 * later on. Also make sure the partition contains a filesystem
416 * of type FS_MSDOS. This doesn't work for floppies, so we have
417 * to check for them too.
418 *
419 * At least some parts of the msdos fs driver seem to assume
420 * that the size of a disk block will always be 512 bytes.
421 * Let's check it...
422 */
423 error = VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart,
424 FREAD, NOCRED, p);
425 if (error)
426 goto error_exit;
427 tmp = dpart.part->p_fstype;
428 dtype = dpart.disklab->d_type;
429 bsize = dpart.disklab->d_secsize;
430 if (bsize != 512 || (dtype!=DTYPE_FLOPPY && tmp!=FS_MSDOS)) {
431 error = EINVAL;
432 goto error_exit;
433 }
434 }
435#endif
436
437 /*
438 * Read the boot sector of the filesystem, and then check the
439 * boot signature. If not a dos boot sector then error out.
440 *
441 * NOTE: 2048 is a maximum sector size in current...
442 */
443 error = bread(devvp, 0, 2048, NOCRED, &bp);
444 if (error)
445 goto error_exit;
446 bp->b_flags |= B_AGE;
447 bsp = (union bootsector *)bp->b_data;
448 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB;
449 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB;
450 b710 = (struct byte_bpb710 *)bsp->bs710.bsPBP;
451
452#ifndef __FreeBSD__
453 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) {
454#endif
455#ifndef MSDOSFS_NOCHECKSIG
456 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0
457 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) {
458 error = EINVAL;
459 goto error_exit;
460 }
461#endif
462#ifndef __FreeBSD__
463 }
464#endif
465
466 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK);
467 bzero((caddr_t)pmp, sizeof *pmp);
468 pmp->pm_mountp = mp;
469
470 /*
471 * Compute several useful quantities from the bpb in the
472 * bootsector. Copy in the dos 5 variant of the bpb then fix up
473 * the fields that are different between dos 5 and dos 3.3.
474 */
475 SecPerClust = b50->bpbSecPerClust;
476 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec);
477 pmp->pm_ResSectors = getushort(b50->bpbResSectors);
478 pmp->pm_FATs = b50->bpbFATs;
479 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts);
480 pmp->pm_Sectors = getushort(b50->bpbSectors);
481 pmp->pm_FATsecs = getushort(b50->bpbFATsecs);
482 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack);
483 pmp->pm_Heads = getushort(b50->bpbHeads);
484 pmp->pm_Media = b50->bpbMedia;
485
486 /* calculate the ratio of sector size to DEV_BSIZE */
487 pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE;
488
489#ifndef __FreeBSD__
490 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) {
491#endif
492 /* XXX - We should probably check more values here */
493 if (!pmp->pm_BytesPerSec || !SecPerClust
494 || !pmp->pm_Heads || pmp->pm_Heads > 255
495#ifdef PC98
496 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 255) {
497#else
498 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 63) {
499#endif
500 error = EINVAL;
501 goto error_exit;
502 }
503#ifndef __FreeBSD__
504 }
505#endif
506
507 if (pmp->pm_Sectors == 0) {
508 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs);
509 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors);
510 } else {
511 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs);
512 pmp->pm_HugeSectors = pmp->pm_Sectors;
513 }
514 if (pmp->pm_HugeSectors > 0xffffffff /
515 (pmp->pm_BytesPerSec / sizeof(struct direntry)) + 1) {
516 /*
517 * We cannot deal currently with this size of disk
518 * due to fileid limitations (see msdosfs_getattr and
519 * msdosfs_readdir)
520 */
521 error = EINVAL;
522 printf("mountmsdosfs(): disk too big, sorry\n");
523 goto error_exit;
524 }
525
526 if (pmp->pm_RootDirEnts == 0) {
527 if (bsp->bs710.bsBootSectSig2 != BOOTSIG2
528 || bsp->bs710.bsBootSectSig3 != BOOTSIG3
529 || pmp->pm_Sectors
530 || pmp->pm_FATsecs
531 || getushort(b710->bpbFSVers)) {
532 error = EINVAL;
533 printf("mountmsdosfs(): bad FAT32 filesystem\n");
534 goto error_exit;
535 }
536 pmp->pm_fatmask = FAT32_MASK;
537 pmp->pm_fatmult = 4;
538 pmp->pm_fatdiv = 1;
539 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs);
540 if (getushort(b710->bpbExtFlags) & FATMIRROR)
541 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM;
542 else
543 pmp->pm_flags |= MSDOSFS_FATMIRROR;
544 } else
545 pmp->pm_flags |= MSDOSFS_FATMIRROR;
546
547 /*
548 * Check a few values (could do some more):
549 * - logical sector size: power of 2, >= block size
550 * - sectors per cluster: power of 2, >= 1
551 * - number of sectors: >= 1, <= size of partition
552 */
553 if ( (SecPerClust == 0)
554 || (SecPerClust & (SecPerClust - 1))
555 || (pmp->pm_BytesPerSec < DEV_BSIZE)
556 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1))
557 || (pmp->pm_HugeSectors == 0)
558 ) {
559 error = EINVAL;
560 goto error_exit;
561 }
562
563 pmp->pm_HugeSectors *= pmp->pm_BlkPerSec;
564 pmp->pm_HiddenSects *= pmp->pm_BlkPerSec; /* XXX not used? */
565 pmp->pm_FATsecs *= pmp->pm_BlkPerSec;
566 SecPerClust *= pmp->pm_BlkPerSec;
567
568 pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec;
569
570 if (FAT32(pmp)) {
571 pmp->pm_rootdirblk = getulong(b710->bpbRootClust);
572 pmp->pm_firstcluster = pmp->pm_fatblk
573 + (pmp->pm_FATs * pmp->pm_FATsecs);
574 pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec;
575 } else {
576 pmp->pm_rootdirblk = pmp->pm_fatblk +
577 (pmp->pm_FATs * pmp->pm_FATsecs);
578 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry)
579 + DEV_BSIZE - 1)
580 / DEV_BSIZE; /* in blocks */
581 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize;
582 }
583
584 pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) /
585 SecPerClust + 1;
586 pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE; /* XXX not used? */
587
588#ifndef __FreeBSD__
589 if (argp->flags & MSDOSFSMNT_GEMDOSFS) {
590 if ((pmp->pm_maxcluster <= (0xff0 - 2))
591 && ((dtype == DTYPE_FLOPPY) || ((dtype == DTYPE_VNODE)
592 && ((pmp->pm_Heads == 1) || (pmp->pm_Heads == 2))))
593 ) {
594 pmp->pm_fatmask = FAT12_MASK;
595 pmp->pm_fatmult = 3;
596 pmp->pm_fatdiv = 2;
597 } else {
598 pmp->pm_fatmask = FAT16_MASK;
599 pmp->pm_fatmult = 2;
600 pmp->pm_fatdiv = 1;
601 }
602 } else
603#endif
604 if (pmp->pm_fatmask == 0) {
605 if (pmp->pm_maxcluster
606 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) {
607 /*
608 * This will usually be a floppy disk. This size makes
609 * sure that one fat entry will not be split across
610 * multiple blocks.
611 */
612 pmp->pm_fatmask = FAT12_MASK;
613 pmp->pm_fatmult = 3;
614 pmp->pm_fatdiv = 2;
615 } else {
616 pmp->pm_fatmask = FAT16_MASK;
617 pmp->pm_fatmult = 2;
618 pmp->pm_fatdiv = 1;
619 }
620 }
621
622 clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv;
623 if (pmp->pm_maxcluster >= clusters) {
624 printf("Warning: number of clusters (%ld) exceeds FAT "
625 "capacity (%ld)\n", pmp->pm_maxcluster + 1, clusters);
626 pmp->pm_maxcluster = clusters - 1;
627 }
628
629
630 if (FAT12(pmp))
631 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec;
632 else
633 pmp->pm_fatblocksize = MSDOSFS_DFLTBSIZE;
634
635 pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE;
636 pmp->pm_bnshift = ffs(DEV_BSIZE) - 1;
637
638 /*
639 * Compute mask and shift value for isolating cluster relative byte
640 * offsets and cluster numbers from a file offset.
641 */
642 pmp->pm_bpcluster = SecPerClust * DEV_BSIZE;
643 pmp->pm_crbomask = pmp->pm_bpcluster - 1;
644 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1;
645
646 /*
647 * Check for valid cluster size
648 * must be a power of 2
649 */
650 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) {
651 error = EINVAL;
652 goto error_exit;
653 }
654
655 /*
656 * Release the bootsector buffer.
657 */
658 brelse(bp);
659 bp = NULL;
660
661 /*
662 * Check FSInfo.
663 */
664 if (pmp->pm_fsinfo) {
665 struct fsinfo *fp;
666
667 if ((error = bread(devvp, pmp->pm_fsinfo, fsi_size(pmp),
668 NOCRED, &bp)) != 0)
669 goto error_exit;
670 fp = (struct fsinfo *)bp->b_data;
671 if (!bcmp(fp->fsisig1, "RRaA", 4)
672 && !bcmp(fp->fsisig2, "rrAa", 4)
673 && !bcmp(fp->fsisig3, "\0\0\125\252", 4)
674 && !bcmp(fp->fsisig4, "\0\0\125\252", 4))
675 pmp->pm_nxtfree = getulong(fp->fsinxtfree);
676 else
677 pmp->pm_fsinfo = 0;
678 brelse(bp);
679 bp = NULL;
680 }
681
682 /*
683 * Check and validate (or perhaps invalidate?) the fsinfo structure?
684 */
685 if (pmp->pm_fsinfo && pmp->pm_nxtfree > pmp->pm_maxcluster) {
686 printf(
687 "Next free cluster in FSInfo (%lu) exceeds maxcluster (%lu)\n",
688 pmp->pm_nxtfree, pmp->pm_maxcluster);
689 error = EINVAL;
690 goto error_exit;
691 }
692
693 /*
694 * Allocate memory for the bitmap of allocated clusters, and then
695 * fill it in.
696 */
697 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1)
698 / N_INUSEBITS)
699 * sizeof(*pmp->pm_inusemap),
700 M_MSDOSFSFAT, M_WAITOK);
701
702 /*
703 * fillinusemap() needs pm_devvp.
704 */
705 pmp->pm_dev = dev;
706 pmp->pm_devvp = devvp;
707
708 /*
709 * Have the inuse map filled in.
710 */
711 if ((error = fillinusemap(pmp)) != 0)
712 goto error_exit;
713
714 /*
715 * If they want fat updates to be synchronous then let them suffer
716 * the performance degradation in exchange for the on disk copy of
717 * the fat being correct just about all the time. I suppose this
718 * would be a good thing to turn on if the kernel is still flakey.
719 */
720 if (mp->mnt_flag & MNT_SYNCHRONOUS)
721 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT;
722
723 /*
724 * Finish up.
725 */
726 if (ronly)
727 pmp->pm_flags |= MSDOSFSMNT_RONLY;
728 else
729 pmp->pm_fmod = 1;
730 mp->mnt_data = (qaddr_t) pmp;
731 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
732 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
733 mp->mnt_flag |= MNT_LOCAL;
734 devvp->v_specmountpoint = mp;
735
736 return 0;
737
738error_exit:
739 if (bp)
740 brelse(bp);
741 (void) VOP_CLOSE(devvp, ronly ? FREAD : FREAD | FWRITE, NOCRED, p);
742 if (pmp) {
743 if (pmp->pm_inusemap)
744 free(pmp->pm_inusemap, M_MSDOSFSFAT);
745 free(pmp, M_MSDOSFSMNT);
746 mp->mnt_data = (qaddr_t)0;
747 }
748 return (error);
749}
750
751/*
752 * Unmount the filesystem described by mp.
753 */
754static int
755msdosfs_unmount(mp, mntflags, p)
756 struct mount *mp;
757 int mntflags;
758 struct proc *p;
759{
760 struct msdosfsmount *pmp;
761 int error, flags;
762
763 flags = 0;
764 if (mntflags & MNT_FORCE)
765 flags |= FORCECLOSE;
766 error = vflush(mp, 0, flags);
767 if (error)
768 return error;
769 pmp = VFSTOMSDOSFS(mp);
770 pmp->pm_devvp->v_specmountpoint = NULL;
771#ifdef MSDOSFS_DEBUG
772 {
773 struct vnode *vp = pmp->pm_devvp;
774
775 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n");
776 printf("flag %08lx, usecount %d, writecount %d, holdcnt %ld\n",
777 vp->v_flag, vp->v_usecount, vp->v_writecount, vp->v_holdcnt);
778 printf("id %lu, mount %p, op %p\n",
779 vp->v_id, vp->v_mount, vp->v_op);
780 printf("freef %p, freeb %p, mount %p\n",
781 vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev,
782 vp->v_mount);
783 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %ld, type %d\n",
784 TAILQ_FIRST(&vp->v_cleanblkhd),
785 TAILQ_FIRST(&vp->v_dirtyblkhd),
786 vp->v_numoutput, vp->v_type);
787 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n",
788 vp->v_socket, vp->v_tag,
789 ((u_int *)vp->v_data)[0],
790 ((u_int *)vp->v_data)[1]);
791 }
792#endif
793 error = VOP_CLOSE(pmp->pm_devvp,
794 (pmp->pm_flags&MSDOSFSMNT_RONLY) ? FREAD : FREAD | FWRITE,
795 NOCRED, p);
796 vrele(pmp->pm_devvp);
797 free(pmp->pm_inusemap, M_MSDOSFSFAT);
798 free(pmp, M_MSDOSFSMNT);
799 mp->mnt_data = (qaddr_t)0;
800 mp->mnt_flag &= ~MNT_LOCAL;
801 return (error);
802}
803
804static int
805msdosfs_root(mp, vpp)
806 struct mount *mp;
807 struct vnode **vpp;
808{
809 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
810 struct denode *ndep;
811 int error;
812
813#ifdef MSDOSFS_DEBUG
814 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp);
815#endif
816 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep);
817 if (error)
818 return (error);
819 *vpp = DETOV(ndep);
820 return (0);
821}
822
823static int
824msdosfs_statfs(mp, sbp, p)
825 struct mount *mp;
826 struct statfs *sbp;
827 struct proc *p;
828{
829 struct msdosfsmount *pmp;
830
831 pmp = VFSTOMSDOSFS(mp);
832 sbp->f_bsize = pmp->pm_bpcluster;
833 sbp->f_iosize = pmp->pm_bpcluster;
834 sbp->f_blocks = pmp->pm_maxcluster + 1;
835 sbp->f_bfree = pmp->pm_freeclustercount;
836 sbp->f_bavail = pmp->pm_freeclustercount;
837 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */
838 sbp->f_ffree = 0; /* what to put in here? */
839 if (sbp != &mp->mnt_stat) {
840 sbp->f_type = mp->mnt_vfc->vfc_typenum;
841 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
842 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
843 }
844 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN);
845 return (0);
846}
847
848static int
849msdosfs_sync(mp, waitfor, cred, p)
850 struct mount *mp;
851 int waitfor;
852 struct ucred *cred;
853 struct proc *p;
854{
855 struct vnode *vp, *nvp;
856 struct denode *dep;
857 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
858 int error, allerror = 0;
859
860 /*
861 * If we ever switch to not updating all of the fats all the time,
862 * this would be the place to update them from the first one.
863 */
864 if (pmp->pm_fmod != 0) {
865 if (pmp->pm_flags & MSDOSFSMNT_RONLY)
866 panic("msdosfs_sync: rofs mod");
867 else {
868 /* update fats here */
869 }
870 }
871 /*
872 * Write back each (modified) denode.
873 */
874 simple_lock(&mntvnode_slock);
875loop:
876 for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist); vp != NULL; vp = nvp) {
877 /*
878 * If the vnode that we are about to sync is no longer
879 * associated with this mount point, start over.
880 */
881 if (vp->v_mount != mp)
882 goto loop;
883
884 simple_lock(&vp->v_interlock);
885 nvp = TAILQ_NEXT(vp, v_nmntvnodes);
886 dep = VTODE(vp);
887 if (vp->v_type == VNON ||
888 ((dep->de_flag &
889 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 &&
890 (TAILQ_EMPTY(&vp->v_dirtyblkhd) || waitfor == MNT_LAZY))) {
891 simple_unlock(&vp->v_interlock);
892 continue;
893 }
894 simple_unlock(&mntvnode_slock);
895 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, p);
896 if (error) {
897 simple_lock(&mntvnode_slock);
898 if (error == ENOENT)
899 goto loop;
900 continue;
901 }
902 error = VOP_FSYNC(vp, cred, waitfor, p);
903 if (error)
904 allerror = error;
905 VOP_UNLOCK(vp, 0, p);
906 vrele(vp);
907 simple_lock(&mntvnode_slock);
908 }
909 simple_unlock(&mntvnode_slock);
910
911 /*
912 * Flush filesystem control info.
913 */
914 if (waitfor != MNT_LAZY) {
915 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY, p);
916 error = VOP_FSYNC(pmp->pm_devvp, cred, waitfor, p);
917 if (error)
918 allerror = error;
919 VOP_UNLOCK(pmp->pm_devvp, 0, p);
920 }
921 return (allerror);
922}
923
924static int
925msdosfs_fhtovp(mp, fhp, vpp)
926 struct mount *mp;
927 struct fid *fhp;
928 struct vnode **vpp;
929{
930 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
931 struct defid *defhp = (struct defid *) fhp;
932 struct denode *dep;
933 int error;
934
935 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep);
936 if (error) {
937 *vpp = NULLVP;
938 return (error);
939 }
940 *vpp = DETOV(dep);
941 return (0);
942}
943
944static int
945msdosfs_checkexp(mp, nam, exflagsp, credanonp)
946 struct mount *mp;
947 struct sockaddr *nam;
948 int *exflagsp;
949 struct ucred **credanonp;
950{
951 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
952 struct netcred *np;
953
954 np = vfs_export_lookup(mp, &pmp->pm_export, nam);
955 if (np == NULL)
956 return (EACCES);
957 *exflagsp = np->netc_exflags;
958 *credanonp = &np->netc_anon;
959 return (0);
960}
961
962static int
963msdosfs_vptofh(vp, fhp)
964 struct vnode *vp;
965 struct fid *fhp;
966{
967 struct denode *dep;
968 struct defid *defhp;
969
970 dep = VTODE(vp);
971 defhp = (struct defid *)fhp;
972 defhp->defid_len = sizeof(struct defid);
973 defhp->defid_dirclust = dep->de_dirclust;
974 defhp->defid_dirofs = dep->de_diroffset;
975 /* defhp->defid_gen = dep->de_gen; */
976 return (0);
977}
978
979static struct vfsops msdosfs_vfsops = {
980 msdosfs_mount,
981 vfs_stdstart,
982 msdosfs_unmount,
983 msdosfs_root,
984 vfs_stdquotactl,
985 msdosfs_statfs,
986 msdosfs_sync,
987 vfs_stdvget,
988 msdosfs_fhtovp,
989 msdosfs_checkexp,
990 msdosfs_vptofh,
991 msdosfs_init,
992 msdosfs_uninit,
993 vfs_stdextattrctl,
994};
995
996VFS_SET(msdosfs_vfsops, msdos, 0);