Remove pccard RCNG script, the daemon config, the depency on pccard
[dragonfly.git] / sys / vfs / msdosfs / msdosfs_vfsops.c
CommitLineData
50c068cf 1/* $FreeBSD: /usr/local/www/cvsroot/FreeBSD/src/sys/msdosfs/Attic/msdosfs_vfsops.c,v 1.60.2.8 2004/03/02 09:43:04 tjr Exp $ */
75ffff0d 2/* $DragonFly: src/sys/vfs/msdosfs/msdosfs_vfsops.c,v 1.24 2005/02/02 21:34:18 joerg Exp $ */
984263bc
MD
3/* $NetBSD: msdosfs_vfsops.c,v 1.51 1997/11/17 15:36:58 ws Exp $ */
4
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/conf.h>
984263bc 55#include <sys/proc.h>
fad57d0e 56#include <sys/nlookup.h>
984263bc
MD
57#include <sys/kernel.h>
58#include <sys/vnode.h>
59#include <sys/mount.h>
60#include <sys/buf.h>
61#include <sys/fcntl.h>
62#include <sys/malloc.h>
63#include <sys/stat.h> /* defines ALLPERMS */
64#include <vm/vm_zone.h>
65
1f2de5d4
MD
66#include "bpb.h"
67#include "bootsect.h"
68#include "direntry.h"
69#include "denode.h"
70#include "msdosfsmount.h"
71#include "fat.h"
984263bc 72
0961aa92
MD
73extern struct vnodeopv_entry_desc msdosfs_vnodeop_entries[];
74
984263bc
MD
75#define MSDOSFS_DFLTBSIZE 4096
76
77#if 1 /*def PC98*/
78/*
79 * XXX - The boot signature formatted by NEC PC-98 DOS looks like a
80 * garbage or a random value :-{
81 * If you want to use that broken-signatured media, define the
82 * following symbol even though PC/AT.
83 * (ex. mount PC-98 DOS formatted FD on PC/AT)
84 */
85#define MSDOSFS_NOCHECKSIG
86#endif
87
88MALLOC_DEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOSFS mount structure");
89static MALLOC_DEFINE(M_MSDOSFSFAT, "MSDOSFS FAT", "MSDOSFS file allocation table");
90
a6ee311a
RG
91static int update_mp (struct mount *mp, struct msdosfs_args *argp);
92static int mountmsdosfs (struct vnode *devvp, struct mount *mp,
93 struct thread *td, struct msdosfs_args *argp);
94static int msdosfs_fhtovp (struct mount *, struct fid *,
95 struct vnode **);
96static int msdosfs_checkexp (struct mount *, struct sockaddr *,
97 int *, struct ucred **);
98static int msdosfs_mount (struct mount *, char *, caddr_t,
21739618 99 struct thread *);
a6ee311a
RG
100static int msdosfs_root (struct mount *, struct vnode **);
101static int msdosfs_statfs (struct mount *, struct statfs *,
102 struct thread *);
103static int msdosfs_sync (struct mount *, int, struct thread *);
104static int msdosfs_unmount (struct mount *, int, struct thread *);
105static int msdosfs_vptofh (struct vnode *, struct fid *);
984263bc
MD
106
107static int
4625f023 108update_mp(struct mount *mp, struct msdosfs_args *argp)
984263bc
MD
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
08c23b99 127#ifndef __DragonFly__
984263bc
MD
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
984263bc
MD
158/*
159 * mp - path - addr in user space of mount point (ie /usr or whatever)
160 * data - addr in user space of mount params including the name of the block
161 * special file to treat as a filesystem.
162 */
163static int
21739618 164msdosfs_mount(struct mount *mp, char *path, caddr_t data, struct thread *td)
984263bc
MD
165{
166 struct vnode *devvp; /* vnode for blk device to mount */
167 struct msdosfs_args args; /* will hold data from mount request */
168 /* msdosfs specific mount control block */
169 struct msdosfsmount *pmp = NULL;
170 size_t size;
171 int error, flags;
172 mode_t accessmode;
dadab5e9 173 struct proc *p = td->td_proc;
fad57d0e 174 struct nlookupdata nd;
dadab5e9
MD
175
176 KKASSERT(p);
984263bc
MD
177
178 error = copyin(data, (caddr_t)&args, sizeof(struct msdosfs_args));
179 if (error)
180 return (error);
181 if (args.magic != MSDOSFS_ARGSMAGIC)
182 args.flags = 0;
183 /*
184 * If updating, check whether changing from read-only to
185 * read/write; if there is no device name, that's all we do.
186 */
187 if (mp->mnt_flag & MNT_UPDATE) {
188 pmp = VFSTOMSDOSFS(mp);
189 error = 0;
190 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) {
191 flags = WRITECLOSE;
192 if (mp->mnt_flag & MNT_FORCE)
193 flags |= FORCECLOSE;
194 error = vflush(mp, 0, flags);
195 }
196 if (!error && (mp->mnt_flag & MNT_RELOAD))
197 /* not yet implemented */
198 error = EOPNOTSUPP;
199 if (error)
200 return (error);
201 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
202 /*
203 * If upgrade to read-write by non-root, then verify
204 * that user has necessary permissions on the device.
205 */
206 if (p->p_ucred->cr_uid != 0) {
207 devvp = pmp->pm_devvp;
5fd012e0 208 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
984263bc 209 error = VOP_ACCESS(devvp, VREAD | VWRITE,
dadab5e9 210 p->p_ucred, td);
984263bc 211 if (error) {
5fd012e0 212 VOP_UNLOCK(devvp, 0, td);
984263bc
MD
213 return (error);
214 }
5fd012e0 215 VOP_UNLOCK(devvp, 0, td);
984263bc
MD
216 }
217 pmp->pm_flags &= ~MSDOSFSMNT_RONLY;
218 }
219 if (args.fspec == 0) {
220#ifdef __notyet__ /* doesn't work correctly with current mountd XXX */
221 if (args.flags & MSDOSFSMNT_MNTOPT) {
222 pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT;
223 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT;
224 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95)
225 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME;
226 }
227#endif
228 /*
229 * Process export requests.
230 */
231 return (vfs_export(mp, &pmp->pm_export, &args.export));
232 }
233 }
234 /*
235 * Not an update, or updating the name: look up the name
236 * and verify that it refers to a sensible block device.
237 */
fad57d0e
MD
238 devvp = NULL;
239 error = nlookup_init(&nd, args.fspec, UIO_USERSPACE, NLC_FOLLOW);
240 if (error == 0)
241 error = nlookup(&nd);
242 if (error == 0)
243 error = cache_vref(nd.nl_ncp, nd.nl_cred, &devvp);
244 nlookup_done(&nd);
984263bc
MD
245 if (error)
246 return (error);
984263bc
MD
247
248 if (!vn_isdisk(devvp, &error)) {
249 vrele(devvp);
250 return (error);
251 }
252 /*
253 * If mount by non-root, then verify that user has necessary
254 * permissions on the device.
255 */
256 if (p->p_ucred->cr_uid != 0) {
257 accessmode = VREAD;
258 if ((mp->mnt_flag & MNT_RDONLY) == 0)
259 accessmode |= VWRITE;
5fd012e0 260 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
dadab5e9 261 error = VOP_ACCESS(devvp, accessmode, p->p_ucred, td);
984263bc
MD
262 if (error) {
263 vput(devvp);
264 return (error);
265 }
5fd012e0 266 VOP_UNLOCK(devvp, 0, td);
984263bc
MD
267 }
268 if ((mp->mnt_flag & MNT_UPDATE) == 0) {
dadab5e9 269 error = mountmsdosfs(devvp, mp, td, &args);
984263bc
MD
270#ifdef MSDOSFS_DEBUG /* only needed for the printf below */
271 pmp = VFSTOMSDOSFS(mp);
272#endif
273 } else {
274 if (devvp != pmp->pm_devvp)
275 error = EINVAL; /* XXX needs translation */
276 else
277 vrele(devvp);
278 }
279 if (error) {
280 vrele(devvp);
281 return (error);
282 }
283
284 error = update_mp(mp, &args);
285 if (error) {
dadab5e9 286 msdosfs_unmount(mp, MNT_FORCE, td);
984263bc
MD
287 return error;
288 }
289
984263bc
MD
290 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
291 &size);
292 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
dadab5e9 293 (void) msdosfs_statfs(mp, &mp->mnt_stat, td);
984263bc
MD
294#ifdef MSDOSFS_DEBUG
295 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap);
296#endif
297 return (0);
298}
299
300static int
4625f023
CP
301mountmsdosfs(struct vnode *devvp, struct mount *mp, struct thread *td,
302 struct msdosfs_args *argp)
984263bc
MD
303{
304 struct msdosfsmount *pmp;
305 struct buf *bp;
e4c9c0c8 306 dev_t dev;
08c23b99 307#ifndef __DragonFly__
984263bc
MD
308 struct partinfo dpart;
309 int bsize = 0, dtype = 0, tmp;
310#endif
311 union bootsector *bsp;
312 struct byte_bpb33 *b33;
313 struct byte_bpb50 *b50;
314 struct byte_bpb710 *b710;
315 u_int8_t SecPerClust;
316 u_long clusters;
317 int ronly, error;
318
319 /*
320 * Disallow multiple mounts of the same device.
321 * Disallow mounting of a device that is currently in use
984263bc
MD
322 * Flush out any old buffers remaining from a previous use.
323 */
324 error = vfs_mountedon(devvp);
325 if (error)
326 return (error);
21739618 327 if (count_udev(devvp->v_udev) > 0)
984263bc 328 return (EBUSY);
5fd012e0 329 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
3b568787 330 error = vinvalbuf(devvp, V_SAVE, td, 0, 0);
5fd012e0 331 VOP_UNLOCK(devvp, 0, td);
984263bc
MD
332 if (error)
333 return (error);
334
335 ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
5fd012e0 336 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
fad57d0e 337 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, NULL, td);
5fd012e0 338 VOP_UNLOCK(devvp, 0, td);
984263bc
MD
339 if (error)
340 return (error);
e4c9c0c8 341 dev = devvp->v_rdev;
984263bc
MD
342 bp = NULL; /* both used in error_exit */
343 pmp = NULL;
344
08c23b99 345#ifndef __DragonFly__
984263bc
MD
346 if (argp->flags & MSDOSFSMNT_GEMDOSFS) {
347 /*
348 * We need the disklabel to calculate the size of a FAT entry
349 * later on. Also make sure the partition contains a filesystem
350 * of type FS_MSDOS. This doesn't work for floppies, so we have
351 * to check for them too.
352 *
353 * At least some parts of the msdos fs driver seem to assume
354 * that the size of a disk block will always be 512 bytes.
355 * Let's check it...
356 */
3b568787 357 error = VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, td);
984263bc
MD
358 if (error)
359 goto error_exit;
360 tmp = dpart.part->p_fstype;
361 dtype = dpart.disklab->d_type;
362 bsize = dpart.disklab->d_secsize;
363 if (bsize != 512 || (dtype!=DTYPE_FLOPPY && tmp!=FS_MSDOS)) {
364 error = EINVAL;
365 goto error_exit;
366 }
367 }
368#endif
369
370 /*
371 * Read the boot sector of the filesystem, and then check the
372 * boot signature. If not a dos boot sector then error out.
373 *
374 * NOTE: 2048 is a maximum sector size in current...
375 */
3b568787 376 error = bread(devvp, 0, 2048, &bp);
984263bc
MD
377 if (error)
378 goto error_exit;
379 bp->b_flags |= B_AGE;
380 bsp = (union bootsector *)bp->b_data;
381 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB;
382 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB;
383 b710 = (struct byte_bpb710 *)bsp->bs710.bsPBP;
384
08c23b99 385#ifndef __DragonFly__
984263bc
MD
386 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) {
387#endif
388#ifndef MSDOSFS_NOCHECKSIG
389 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0
390 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) {
391 error = EINVAL;
392 goto error_exit;
393 }
394#endif
08c23b99 395#ifndef __DragonFly__
984263bc
MD
396 }
397#endif
398
399 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK);
400 bzero((caddr_t)pmp, sizeof *pmp);
401 pmp->pm_mountp = mp;
402
403 /*
404 * Compute several useful quantities from the bpb in the
405 * bootsector. Copy in the dos 5 variant of the bpb then fix up
406 * the fields that are different between dos 5 and dos 3.3.
407 */
408 SecPerClust = b50->bpbSecPerClust;
409 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec);
410 pmp->pm_ResSectors = getushort(b50->bpbResSectors);
411 pmp->pm_FATs = b50->bpbFATs;
412 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts);
413 pmp->pm_Sectors = getushort(b50->bpbSectors);
414 pmp->pm_FATsecs = getushort(b50->bpbFATsecs);
415 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack);
416 pmp->pm_Heads = getushort(b50->bpbHeads);
417 pmp->pm_Media = b50->bpbMedia;
418
419 /* calculate the ratio of sector size to DEV_BSIZE */
420 pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE;
421
08c23b99 422#ifndef __DragonFly__
984263bc
MD
423 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) {
424#endif
425 /* XXX - We should probably check more values here */
426 if (!pmp->pm_BytesPerSec || !SecPerClust
fab3e130 427 || !pmp->pm_Heads
984263bc
MD
428#ifdef PC98
429 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 255) {
430#else
431 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 63) {
432#endif
433 error = EINVAL;
434 goto error_exit;
435 }
08c23b99 436#ifndef __DragonFly__
984263bc
MD
437 }
438#endif
439
440 if (pmp->pm_Sectors == 0) {
441 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs);
442 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors);
443 } else {
444 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs);
445 pmp->pm_HugeSectors = pmp->pm_Sectors;
446 }
447 if (pmp->pm_HugeSectors > 0xffffffff /
448 (pmp->pm_BytesPerSec / sizeof(struct direntry)) + 1) {
449 /*
450 * We cannot deal currently with this size of disk
451 * due to fileid limitations (see msdosfs_getattr and
452 * msdosfs_readdir)
453 */
454 error = EINVAL;
455 printf("mountmsdosfs(): disk too big, sorry\n");
456 goto error_exit;
457 }
458
459 if (pmp->pm_RootDirEnts == 0) {
460 if (bsp->bs710.bsBootSectSig2 != BOOTSIG2
461 || bsp->bs710.bsBootSectSig3 != BOOTSIG3
462 || pmp->pm_Sectors
463 || pmp->pm_FATsecs
464 || getushort(b710->bpbFSVers)) {
465 error = EINVAL;
466 printf("mountmsdosfs(): bad FAT32 filesystem\n");
467 goto error_exit;
468 }
469 pmp->pm_fatmask = FAT32_MASK;
470 pmp->pm_fatmult = 4;
471 pmp->pm_fatdiv = 1;
472 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs);
473 if (getushort(b710->bpbExtFlags) & FATMIRROR)
474 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM;
475 else
476 pmp->pm_flags |= MSDOSFS_FATMIRROR;
477 } else
478 pmp->pm_flags |= MSDOSFS_FATMIRROR;
479
480 /*
481 * Check a few values (could do some more):
482 * - logical sector size: power of 2, >= block size
483 * - sectors per cluster: power of 2, >= 1
484 * - number of sectors: >= 1, <= size of partition
485 */
486 if ( (SecPerClust == 0)
487 || (SecPerClust & (SecPerClust - 1))
488 || (pmp->pm_BytesPerSec < DEV_BSIZE)
489 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1))
490 || (pmp->pm_HugeSectors == 0)
491 ) {
492 error = EINVAL;
493 goto error_exit;
494 }
495
496 pmp->pm_HugeSectors *= pmp->pm_BlkPerSec;
497 pmp->pm_HiddenSects *= pmp->pm_BlkPerSec; /* XXX not used? */
498 pmp->pm_FATsecs *= pmp->pm_BlkPerSec;
499 SecPerClust *= pmp->pm_BlkPerSec;
500
501 pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec;
502
503 if (FAT32(pmp)) {
504 pmp->pm_rootdirblk = getulong(b710->bpbRootClust);
505 pmp->pm_firstcluster = pmp->pm_fatblk
506 + (pmp->pm_FATs * pmp->pm_FATsecs);
507 pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec;
508 } else {
509 pmp->pm_rootdirblk = pmp->pm_fatblk +
510 (pmp->pm_FATs * pmp->pm_FATsecs);
511 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry)
512 + DEV_BSIZE - 1)
513 / DEV_BSIZE; /* in blocks */
514 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize;
515 }
516
517 pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) /
518 SecPerClust + 1;
519 pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE; /* XXX not used? */
520
08c23b99 521#ifndef __DragonFly__
984263bc
MD
522 if (argp->flags & MSDOSFSMNT_GEMDOSFS) {
523 if ((pmp->pm_maxcluster <= (0xff0 - 2))
524 && ((dtype == DTYPE_FLOPPY) || ((dtype == DTYPE_VNODE)
525 && ((pmp->pm_Heads == 1) || (pmp->pm_Heads == 2))))
526 ) {
527 pmp->pm_fatmask = FAT12_MASK;
528 pmp->pm_fatmult = 3;
529 pmp->pm_fatdiv = 2;
530 } else {
531 pmp->pm_fatmask = FAT16_MASK;
532 pmp->pm_fatmult = 2;
533 pmp->pm_fatdiv = 1;
534 }
535 } else
536#endif
537 if (pmp->pm_fatmask == 0) {
538 if (pmp->pm_maxcluster
539 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) {
540 /*
541 * This will usually be a floppy disk. This size makes
542 * sure that one fat entry will not be split across
543 * multiple blocks.
544 */
545 pmp->pm_fatmask = FAT12_MASK;
546 pmp->pm_fatmult = 3;
547 pmp->pm_fatdiv = 2;
548 } else {
549 pmp->pm_fatmask = FAT16_MASK;
550 pmp->pm_fatmult = 2;
551 pmp->pm_fatdiv = 1;
552 }
553 }
554
555 clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv;
556 if (pmp->pm_maxcluster >= clusters) {
557 printf("Warning: number of clusters (%ld) exceeds FAT "
558 "capacity (%ld)\n", pmp->pm_maxcluster + 1, clusters);
559 pmp->pm_maxcluster = clusters - 1;
560 }
561
562
563 if (FAT12(pmp))
564 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec;
565 else
566 pmp->pm_fatblocksize = MSDOSFS_DFLTBSIZE;
567
568 pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE;
569 pmp->pm_bnshift = ffs(DEV_BSIZE) - 1;
570
571 /*
572 * Compute mask and shift value for isolating cluster relative byte
573 * offsets and cluster numbers from a file offset.
574 */
575 pmp->pm_bpcluster = SecPerClust * DEV_BSIZE;
576 pmp->pm_crbomask = pmp->pm_bpcluster - 1;
577 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1;
578
579 /*
580 * Check for valid cluster size
581 * must be a power of 2
582 */
583 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) {
584 error = EINVAL;
585 goto error_exit;
586 }
587
588 /*
589 * Release the bootsector buffer.
590 */
591 brelse(bp);
592 bp = NULL;
593
594 /*
595 * Check FSInfo.
596 */
597 if (pmp->pm_fsinfo) {
598 struct fsinfo *fp;
599
3b568787 600 if ((error = bread(devvp, pmp->pm_fsinfo, fsi_size(pmp), &bp)) != 0)
984263bc
MD
601 goto error_exit;
602 fp = (struct fsinfo *)bp->b_data;
603 if (!bcmp(fp->fsisig1, "RRaA", 4)
604 && !bcmp(fp->fsisig2, "rrAa", 4)
605 && !bcmp(fp->fsisig3, "\0\0\125\252", 4)
50c068cf 606 && !bcmp(fp->fsisig4, "\0\0\125\252", 4)) {
984263bc 607 pmp->pm_nxtfree = getulong(fp->fsinxtfree);
50c068cf
CP
608 if (pmp->pm_nxtfree == 0xffffffff)
609 pmp->pm_nxtfree = CLUST_FIRST;
610 } else
984263bc
MD
611 pmp->pm_fsinfo = 0;
612 brelse(bp);
613 bp = NULL;
614 }
615
616 /*
617 * Check and validate (or perhaps invalidate?) the fsinfo structure?
618 */
619 if (pmp->pm_fsinfo && pmp->pm_nxtfree > pmp->pm_maxcluster) {
620 printf(
621 "Next free cluster in FSInfo (%lu) exceeds maxcluster (%lu)\n",
622 pmp->pm_nxtfree, pmp->pm_maxcluster);
623 error = EINVAL;
624 goto error_exit;
625 }
626
627 /*
628 * Allocate memory for the bitmap of allocated clusters, and then
629 * fill it in.
630 */
631 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1)
632 / N_INUSEBITS)
633 * sizeof(*pmp->pm_inusemap),
634 M_MSDOSFSFAT, M_WAITOK);
635
636 /*
637 * fillinusemap() needs pm_devvp.
638 */
639 pmp->pm_dev = dev;
640 pmp->pm_devvp = devvp;
641
642 /*
643 * Have the inuse map filled in.
644 */
645 if ((error = fillinusemap(pmp)) != 0)
646 goto error_exit;
647
648 /*
649 * If they want fat updates to be synchronous then let them suffer
650 * the performance degradation in exchange for the on disk copy of
651 * the fat being correct just about all the time. I suppose this
652 * would be a good thing to turn on if the kernel is still flakey.
653 */
654 if (mp->mnt_flag & MNT_SYNCHRONOUS)
655 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT;
656
657 /*
658 * Finish up.
659 */
660 if (ronly)
661 pmp->pm_flags |= MSDOSFSMNT_RONLY;
662 else
663 pmp->pm_fmod = 1;
664 mp->mnt_data = (qaddr_t) pmp;
665 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
666 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
667 mp->mnt_flag |= MNT_LOCAL;
6ddb7618 668 vfs_add_vnodeops(mp, &mp->mnt_vn_norm_ops, msdosfs_vnodeop_entries);
e4c9c0c8 669 dev->si_mountpoint = mp;
984263bc
MD
670
671 return 0;
672
673error_exit:
674 if (bp)
675 brelse(bp);
3b568787 676 (void) VOP_CLOSE(devvp, ronly ? FREAD : FREAD | FWRITE, td);
984263bc
MD
677 if (pmp) {
678 if (pmp->pm_inusemap)
679 free(pmp->pm_inusemap, M_MSDOSFSFAT);
680 free(pmp, M_MSDOSFSMNT);
681 mp->mnt_data = (qaddr_t)0;
682 }
683 return (error);
684}
685
686/*
687 * Unmount the filesystem described by mp.
688 */
689static int
4625f023 690msdosfs_unmount(struct mount *mp, int mntflags, struct thread *td)
984263bc
MD
691{
692 struct msdosfsmount *pmp;
693 int error, flags;
694
695 flags = 0;
696 if (mntflags & MNT_FORCE)
697 flags |= FORCECLOSE;
698 error = vflush(mp, 0, flags);
699 if (error)
700 return error;
701 pmp = VFSTOMSDOSFS(mp);
e4c9c0c8 702 pmp->pm_devvp->v_rdev->si_mountpoint = NULL;
984263bc
MD
703#ifdef MSDOSFS_DEBUG
704 {
705 struct vnode *vp = pmp->pm_devvp;
706
707 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n");
708 printf("flag %08lx, usecount %d, writecount %d, holdcnt %ld\n",
709 vp->v_flag, vp->v_usecount, vp->v_writecount, vp->v_holdcnt);
710 printf("id %lu, mount %p, op %p\n",
711 vp->v_id, vp->v_mount, vp->v_op);
712 printf("freef %p, freeb %p, mount %p\n",
ecd80f47 713 TAILQ_NEXT(vp, v_freelist), TAILQ_PREV(vp, v_freelist),
984263bc
MD
714 vp->v_mount);
715 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %ld, type %d\n",
716 TAILQ_FIRST(&vp->v_cleanblkhd),
717 TAILQ_FIRST(&vp->v_dirtyblkhd),
718 vp->v_numoutput, vp->v_type);
719 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n",
720 vp->v_socket, vp->v_tag,
721 ((u_int *)vp->v_data)[0],
722 ((u_int *)vp->v_data)[1]);
723 }
724#endif
725 error = VOP_CLOSE(pmp->pm_devvp,
726 (pmp->pm_flags&MSDOSFSMNT_RONLY) ? FREAD : FREAD | FWRITE,
3b568787 727 td);
984263bc
MD
728 vrele(pmp->pm_devvp);
729 free(pmp->pm_inusemap, M_MSDOSFSFAT);
730 free(pmp, M_MSDOSFSMNT);
731 mp->mnt_data = (qaddr_t)0;
732 mp->mnt_flag &= ~MNT_LOCAL;
733 return (error);
734}
735
736static int
4625f023 737msdosfs_root(struct mount *mp, struct vnode **vpp)
984263bc
MD
738{
739 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
740 struct denode *ndep;
741 int error;
742
743#ifdef MSDOSFS_DEBUG
744 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp);
745#endif
746 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep);
747 if (error)
748 return (error);
749 *vpp = DETOV(ndep);
750 return (0);
751}
752
753static int
4625f023 754msdosfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td)
984263bc
MD
755{
756 struct msdosfsmount *pmp;
757
758 pmp = VFSTOMSDOSFS(mp);
759 sbp->f_bsize = pmp->pm_bpcluster;
760 sbp->f_iosize = pmp->pm_bpcluster;
761 sbp->f_blocks = pmp->pm_maxcluster + 1;
762 sbp->f_bfree = pmp->pm_freeclustercount;
763 sbp->f_bavail = pmp->pm_freeclustercount;
764 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */
765 sbp->f_ffree = 0; /* what to put in here? */
766 if (sbp != &mp->mnt_stat) {
767 sbp->f_type = mp->mnt_vfc->vfc_typenum;
984263bc
MD
768 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
769 }
770 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN);
771 return (0);
772}
773
41a01a4d
MD
774struct scaninfo {
775 int rescan;
776 int allerror;
777 int waitfor;
778 thread_t td;
779};
780
5fd012e0 781static int msdosfs_sync_scan(struct mount *mp, struct vnode *vp, void *data);
41a01a4d 782
984263bc 783static int
4625f023 784msdosfs_sync(struct mount *mp, int waitfor, struct thread *td)
984263bc 785{
984263bc 786 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
41a01a4d
MD
787 struct scaninfo scaninfo;
788 int error;
984263bc
MD
789
790 /*
791 * If we ever switch to not updating all of the fats all the time,
792 * this would be the place to update them from the first one.
793 */
794 if (pmp->pm_fmod != 0) {
795 if (pmp->pm_flags & MSDOSFSMNT_RONLY)
796 panic("msdosfs_sync: rofs mod");
797 else {
798 /* update fats here */
799 }
800 }
801 /*
802 * Write back each (modified) denode.
803 */
41a01a4d
MD
804 scaninfo.allerror = 0;
805 scaninfo.rescan = 1;
806 scaninfo.td = td;
807 while (scaninfo.rescan) {
808 scaninfo.rescan = 0;
5fd012e0 809 vmntvnodescan(mp, VMSC_GETVP|VMSC_NOWAIT, NULL, msdosfs_sync_scan, &scaninfo);
984263bc 810 }
984263bc
MD
811
812 /*
813 * Flush filesystem control info.
814 */
815 if (waitfor != MNT_LAZY) {
5fd012e0 816 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY, td);
41a01a4d
MD
817 if ((error = VOP_FSYNC(pmp->pm_devvp, waitfor, td)) != 0)
818 scaninfo.allerror = error;
5fd012e0 819 VOP_UNLOCK(pmp->pm_devvp, 0, td);
41a01a4d
MD
820 }
821 return (scaninfo.allerror);
822}
823
4625f023 824static int
5fd012e0 825msdosfs_sync_scan(struct mount *mp, struct vnode *vp, void *data)
41a01a4d
MD
826{
827 struct scaninfo *info = data;
828 struct denode *dep;
829 int error;
830
831 dep = VTODE(vp);
832 if (vp->v_type == VNON ||
833 ((dep->de_flag &
834 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 &&
835 (TAILQ_EMPTY(&vp->v_dirtyblkhd) || info->waitfor == MNT_LAZY))) {
41a01a4d 836 return(0);
984263bc 837 }
41a01a4d
MD
838 if ((error = VOP_FSYNC(vp, info->waitfor, info->td)) != 0)
839 info->allerror = error;
41a01a4d 840 return(0);
984263bc
MD
841}
842
843static int
4625f023 844msdosfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp)
984263bc
MD
845{
846 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
847 struct defid *defhp = (struct defid *) fhp;
848 struct denode *dep;
849 int error;
850
851 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep);
852 if (error) {
853 *vpp = NULLVP;
854 return (error);
855 }
856 *vpp = DETOV(dep);
857 return (0);
858}
859
860static int
4625f023
CP
861msdosfs_checkexp(struct mount *mp, struct sockaddr *nam, int *exflagsp,
862 struct ucred **credanonp)
984263bc
MD
863{
864 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
865 struct netcred *np;
866
867 np = vfs_export_lookup(mp, &pmp->pm_export, nam);
868 if (np == NULL)
869 return (EACCES);
870 *exflagsp = np->netc_exflags;
871 *credanonp = &np->netc_anon;
872 return (0);
873}
874
875static int
4625f023 876msdosfs_vptofh(struct vnode *vp, struct fid *fhp)
984263bc
MD
877{
878 struct denode *dep;
879 struct defid *defhp;
880
881 dep = VTODE(vp);
882 defhp = (struct defid *)fhp;
883 defhp->defid_len = sizeof(struct defid);
884 defhp->defid_dirclust = dep->de_dirclust;
885 defhp->defid_dirofs = dep->de_diroffset;
886 /* defhp->defid_gen = dep->de_gen; */
887 return (0);
888}
889
890static struct vfsops msdosfs_vfsops = {
891 msdosfs_mount,
892 vfs_stdstart,
893 msdosfs_unmount,
894 msdosfs_root,
895 vfs_stdquotactl,
896 msdosfs_statfs,
897 msdosfs_sync,
898 vfs_stdvget,
899 msdosfs_fhtovp,
900 msdosfs_checkexp,
901 msdosfs_vptofh,
902 msdosfs_init,
903 msdosfs_uninit,
904 vfs_stdextattrctl,
905};
906
907VFS_SET(msdosfs_vfsops, msdos, 0);