Remove the thread_t argument from vfs_busy() and vfs_unbusy(). Passing a
[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 $ */
ca466bae 2/* $DragonFly: src/sys/vfs/msdosfs/msdosfs_vfsops.c,v 1.32 2006/05/05 21:15:10 dillon 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;
ca466bae 208 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
984263bc 209 error = VOP_ACCESS(devvp, VREAD | VWRITE,
dadab5e9 210 p->p_ucred, td);
984263bc 211 if (error) {
ca466bae 212 VOP_UNLOCK(devvp, 0);
984263bc
MD
213 return (error);
214 }
ca466bae 215 VOP_UNLOCK(devvp, 0);
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;
ca466bae 260 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
dadab5e9 261 error = VOP_ACCESS(devvp, accessmode, p->p_ucred, td);
984263bc
MD
262 if (error) {
263 vput(devvp);
264 return (error);
265 }
ca466bae 266 VOP_UNLOCK(devvp, 0);
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
b1ce5639 290 copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
984263bc 291 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
b1ce5639 292 msdosfs_statfs(mp, &mp->mnt_stat, td);
984263bc
MD
293#ifdef MSDOSFS_DEBUG
294 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap);
295#endif
296 return (0);
297}
298
299static int
4625f023
CP
300mountmsdosfs(struct vnode *devvp, struct mount *mp, struct thread *td,
301 struct msdosfs_args *argp)
984263bc
MD
302{
303 struct msdosfsmount *pmp;
304 struct buf *bp;
e4c9c0c8 305 dev_t dev;
08c23b99 306#ifndef __DragonFly__
984263bc
MD
307 struct partinfo dpart;
308 int bsize = 0, dtype = 0, tmp;
309#endif
310 union bootsector *bsp;
311 struct byte_bpb33 *b33;
312 struct byte_bpb50 *b50;
313 struct byte_bpb710 *b710;
314 u_int8_t SecPerClust;
315 u_long clusters;
316 int ronly, error;
317
318 /*
319 * Disallow multiple mounts of the same device.
320 * Disallow mounting of a device that is currently in use
984263bc
MD
321 * Flush out any old buffers remaining from a previous use.
322 */
323 error = vfs_mountedon(devvp);
324 if (error)
325 return (error);
21739618 326 if (count_udev(devvp->v_udev) > 0)
984263bc 327 return (EBUSY);
ca466bae 328 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
3b568787 329 error = vinvalbuf(devvp, V_SAVE, td, 0, 0);
ca466bae 330 VOP_UNLOCK(devvp, 0);
984263bc
MD
331 if (error)
332 return (error);
333
334 ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
ca466bae 335 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
fad57d0e 336 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, NULL, td);
ca466bae 337 VOP_UNLOCK(devvp, 0);
984263bc
MD
338 if (error)
339 return (error);
e4c9c0c8 340 dev = devvp->v_rdev;
984263bc
MD
341 bp = NULL; /* both used in error_exit */
342 pmp = NULL;
343
08c23b99 344#ifndef __DragonFly__
984263bc
MD
345 if (argp->flags & MSDOSFSMNT_GEMDOSFS) {
346 /*
347 * We need the disklabel to calculate the size of a FAT entry
348 * later on. Also make sure the partition contains a filesystem
349 * of type FS_MSDOS. This doesn't work for floppies, so we have
350 * to check for them too.
351 *
352 * At least some parts of the msdos fs driver seem to assume
353 * that the size of a disk block will always be 512 bytes.
354 * Let's check it...
355 */
3b568787 356 error = VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, td);
984263bc
MD
357 if (error)
358 goto error_exit;
359 tmp = dpart.part->p_fstype;
360 dtype = dpart.disklab->d_type;
361 bsize = dpart.disklab->d_secsize;
362 if (bsize != 512 || (dtype!=DTYPE_FLOPPY && tmp!=FS_MSDOS)) {
363 error = EINVAL;
364 goto error_exit;
365 }
366 }
367#endif
368
369 /*
370 * Read the boot sector of the filesystem, and then check the
371 * boot signature. If not a dos boot sector then error out.
372 *
373 * NOTE: 2048 is a maximum sector size in current...
374 */
3b568787 375 error = bread(devvp, 0, 2048, &bp);
984263bc
MD
376 if (error)
377 goto error_exit;
378 bp->b_flags |= B_AGE;
379 bsp = (union bootsector *)bp->b_data;
380 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB;
381 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB;
382 b710 = (struct byte_bpb710 *)bsp->bs710.bsPBP;
383
08c23b99 384#ifndef __DragonFly__
984263bc
MD
385 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) {
386#endif
387#ifndef MSDOSFS_NOCHECKSIG
388 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0
389 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) {
390 error = EINVAL;
391 goto error_exit;
392 }
393#endif
08c23b99 394#ifndef __DragonFly__
984263bc
MD
395 }
396#endif
397
398 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK);
399 bzero((caddr_t)pmp, sizeof *pmp);
400 pmp->pm_mountp = mp;
401
402 /*
403 * Compute several useful quantities from the bpb in the
404 * bootsector. Copy in the dos 5 variant of the bpb then fix up
405 * the fields that are different between dos 5 and dos 3.3.
406 */
407 SecPerClust = b50->bpbSecPerClust;
408 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec);
409 pmp->pm_ResSectors = getushort(b50->bpbResSectors);
410 pmp->pm_FATs = b50->bpbFATs;
411 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts);
412 pmp->pm_Sectors = getushort(b50->bpbSectors);
413 pmp->pm_FATsecs = getushort(b50->bpbFATsecs);
414 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack);
415 pmp->pm_Heads = getushort(b50->bpbHeads);
416 pmp->pm_Media = b50->bpbMedia;
417
418 /* calculate the ratio of sector size to DEV_BSIZE */
419 pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE;
420
08c23b99 421#ifndef __DragonFly__
984263bc
MD
422 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) {
423#endif
424 /* XXX - We should probably check more values here */
425 if (!pmp->pm_BytesPerSec || !SecPerClust
fab3e130 426 || !pmp->pm_Heads
984263bc 427 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 63) {
984263bc
MD
428 error = EINVAL;
429 goto error_exit;
430 }
08c23b99 431#ifndef __DragonFly__
984263bc
MD
432 }
433#endif
434
435 if (pmp->pm_Sectors == 0) {
436 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs);
437 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors);
438 } else {
439 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs);
440 pmp->pm_HugeSectors = pmp->pm_Sectors;
441 }
442 if (pmp->pm_HugeSectors > 0xffffffff /
443 (pmp->pm_BytesPerSec / sizeof(struct direntry)) + 1) {
444 /*
445 * We cannot deal currently with this size of disk
446 * due to fileid limitations (see msdosfs_getattr and
447 * msdosfs_readdir)
448 */
449 error = EINVAL;
450 printf("mountmsdosfs(): disk too big, sorry\n");
451 goto error_exit;
452 }
453
454 if (pmp->pm_RootDirEnts == 0) {
455 if (bsp->bs710.bsBootSectSig2 != BOOTSIG2
456 || bsp->bs710.bsBootSectSig3 != BOOTSIG3
457 || pmp->pm_Sectors
458 || pmp->pm_FATsecs
459 || getushort(b710->bpbFSVers)) {
460 error = EINVAL;
461 printf("mountmsdosfs(): bad FAT32 filesystem\n");
462 goto error_exit;
463 }
464 pmp->pm_fatmask = FAT32_MASK;
465 pmp->pm_fatmult = 4;
466 pmp->pm_fatdiv = 1;
467 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs);
468 if (getushort(b710->bpbExtFlags) & FATMIRROR)
469 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM;
470 else
471 pmp->pm_flags |= MSDOSFS_FATMIRROR;
472 } else
473 pmp->pm_flags |= MSDOSFS_FATMIRROR;
474
475 /*
476 * Check a few values (could do some more):
477 * - logical sector size: power of 2, >= block size
478 * - sectors per cluster: power of 2, >= 1
479 * - number of sectors: >= 1, <= size of partition
480 */
481 if ( (SecPerClust == 0)
482 || (SecPerClust & (SecPerClust - 1))
483 || (pmp->pm_BytesPerSec < DEV_BSIZE)
484 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1))
485 || (pmp->pm_HugeSectors == 0)
486 ) {
487 error = EINVAL;
488 goto error_exit;
489 }
490
491 pmp->pm_HugeSectors *= pmp->pm_BlkPerSec;
492 pmp->pm_HiddenSects *= pmp->pm_BlkPerSec; /* XXX not used? */
493 pmp->pm_FATsecs *= pmp->pm_BlkPerSec;
494 SecPerClust *= pmp->pm_BlkPerSec;
495
496 pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec;
497
498 if (FAT32(pmp)) {
499 pmp->pm_rootdirblk = getulong(b710->bpbRootClust);
500 pmp->pm_firstcluster = pmp->pm_fatblk
501 + (pmp->pm_FATs * pmp->pm_FATsecs);
502 pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec;
503 } else {
504 pmp->pm_rootdirblk = pmp->pm_fatblk +
505 (pmp->pm_FATs * pmp->pm_FATsecs);
506 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry)
507 + DEV_BSIZE - 1)
508 / DEV_BSIZE; /* in blocks */
509 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize;
510 }
511
512 pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) /
513 SecPerClust + 1;
514 pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE; /* XXX not used? */
515
08c23b99 516#ifndef __DragonFly__
984263bc
MD
517 if (argp->flags & MSDOSFSMNT_GEMDOSFS) {
518 if ((pmp->pm_maxcluster <= (0xff0 - 2))
519 && ((dtype == DTYPE_FLOPPY) || ((dtype == DTYPE_VNODE)
520 && ((pmp->pm_Heads == 1) || (pmp->pm_Heads == 2))))
521 ) {
522 pmp->pm_fatmask = FAT12_MASK;
523 pmp->pm_fatmult = 3;
524 pmp->pm_fatdiv = 2;
525 } else {
526 pmp->pm_fatmask = FAT16_MASK;
527 pmp->pm_fatmult = 2;
528 pmp->pm_fatdiv = 1;
529 }
530 } else
531#endif
532 if (pmp->pm_fatmask == 0) {
533 if (pmp->pm_maxcluster
534 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) {
535 /*
536 * This will usually be a floppy disk. This size makes
537 * sure that one fat entry will not be split across
538 * multiple blocks.
539 */
540 pmp->pm_fatmask = FAT12_MASK;
541 pmp->pm_fatmult = 3;
542 pmp->pm_fatdiv = 2;
543 } else {
544 pmp->pm_fatmask = FAT16_MASK;
545 pmp->pm_fatmult = 2;
546 pmp->pm_fatdiv = 1;
547 }
548 }
549
550 clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv;
551 if (pmp->pm_maxcluster >= clusters) {
552 printf("Warning: number of clusters (%ld) exceeds FAT "
553 "capacity (%ld)\n", pmp->pm_maxcluster + 1, clusters);
554 pmp->pm_maxcluster = clusters - 1;
555 }
556
557
558 if (FAT12(pmp))
559 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec;
560 else
561 pmp->pm_fatblocksize = MSDOSFS_DFLTBSIZE;
562
563 pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE;
54078292 564 pmp->pm_bnshift = DEV_BSHIFT;
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MD
565
566 /*
567 * Compute mask and shift value for isolating cluster relative byte
568 * offsets and cluster numbers from a file offset.
569 */
570 pmp->pm_bpcluster = SecPerClust * DEV_BSIZE;
571 pmp->pm_crbomask = pmp->pm_bpcluster - 1;
572 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1;
573
574 /*
575 * Check for valid cluster size
576 * must be a power of 2
577 */
578 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) {
579 error = EINVAL;
580 goto error_exit;
581 }
582
583 /*
584 * Release the bootsector buffer.
585 */
586 brelse(bp);
587 bp = NULL;
588
589 /*
590 * Check FSInfo.
591 */
592 if (pmp->pm_fsinfo) {
593 struct fsinfo *fp;
594
54078292 595 if ((error = bread(devvp, de_bntodoff(pmp, pmp->pm_fsinfo), fsi_size(pmp), &bp)) != 0)
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596 goto error_exit;
597 fp = (struct fsinfo *)bp->b_data;
598 if (!bcmp(fp->fsisig1, "RRaA", 4)
599 && !bcmp(fp->fsisig2, "rrAa", 4)
600 && !bcmp(fp->fsisig3, "\0\0\125\252", 4)
50c068cf 601 && !bcmp(fp->fsisig4, "\0\0\125\252", 4)) {
984263bc 602 pmp->pm_nxtfree = getulong(fp->fsinxtfree);
50c068cf
CP
603 if (pmp->pm_nxtfree == 0xffffffff)
604 pmp->pm_nxtfree = CLUST_FIRST;
605 } else
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MD
606 pmp->pm_fsinfo = 0;
607 brelse(bp);
608 bp = NULL;
609 }
610
611 /*
612 * Check and validate (or perhaps invalidate?) the fsinfo structure?
613 */
614 if (pmp->pm_fsinfo && pmp->pm_nxtfree > pmp->pm_maxcluster) {
615 printf(
616 "Next free cluster in FSInfo (%lu) exceeds maxcluster (%lu)\n",
617 pmp->pm_nxtfree, pmp->pm_maxcluster);
618 error = EINVAL;
619 goto error_exit;
620 }
621
622 /*
623 * Allocate memory for the bitmap of allocated clusters, and then
624 * fill it in.
625 */
626 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1)
627 / N_INUSEBITS)
628 * sizeof(*pmp->pm_inusemap),
629 M_MSDOSFSFAT, M_WAITOK);
630
631 /*
632 * fillinusemap() needs pm_devvp.
633 */
634 pmp->pm_dev = dev;
635 pmp->pm_devvp = devvp;
636
637 /*
638 * Have the inuse map filled in.
639 */
640 if ((error = fillinusemap(pmp)) != 0)
641 goto error_exit;
642
643 /*
644 * If they want fat updates to be synchronous then let them suffer
645 * the performance degradation in exchange for the on disk copy of
646 * the fat being correct just about all the time. I suppose this
647 * would be a good thing to turn on if the kernel is still flakey.
648 */
649 if (mp->mnt_flag & MNT_SYNCHRONOUS)
650 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT;
651
652 /*
653 * Finish up.
654 */
655 if (ronly)
656 pmp->pm_flags |= MSDOSFSMNT_RONLY;
657 else
658 pmp->pm_fmod = 1;
659 mp->mnt_data = (qaddr_t) pmp;
660 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
661 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
662 mp->mnt_flag |= MNT_LOCAL;
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MD
663 vfs_add_vnodeops(mp, &mp->mnt_vn_norm_ops,
664 msdosfs_vnodeop_entries, 0);
e4c9c0c8 665 dev->si_mountpoint = mp;
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MD
666
667 return 0;
668
669error_exit:
670 if (bp)
671 brelse(bp);
b1ce5639 672 VOP_CLOSE(devvp, ronly ? FREAD : FREAD | FWRITE, td);
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MD
673 if (pmp) {
674 if (pmp->pm_inusemap)
675 free(pmp->pm_inusemap, M_MSDOSFSFAT);
676 free(pmp, M_MSDOSFSMNT);
677 mp->mnt_data = (qaddr_t)0;
678 }
679 return (error);
680}
681
682/*
683 * Unmount the filesystem described by mp.
684 */
685static int
4625f023 686msdosfs_unmount(struct mount *mp, int mntflags, struct thread *td)
984263bc
MD
687{
688 struct msdosfsmount *pmp;
689 int error, flags;
690
691 flags = 0;
692 if (mntflags & MNT_FORCE)
693 flags |= FORCECLOSE;
694 error = vflush(mp, 0, flags);
695 if (error)
696 return error;
697 pmp = VFSTOMSDOSFS(mp);
e4c9c0c8 698 pmp->pm_devvp->v_rdev->si_mountpoint = NULL;
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MD
699#ifdef MSDOSFS_DEBUG
700 {
701 struct vnode *vp = pmp->pm_devvp;
702
703 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n");
704 printf("flag %08lx, usecount %d, writecount %d, holdcnt %ld\n",
705 vp->v_flag, vp->v_usecount, vp->v_writecount, vp->v_holdcnt);
706 printf("id %lu, mount %p, op %p\n",
707 vp->v_id, vp->v_mount, vp->v_op);
708 printf("freef %p, freeb %p, mount %p\n",
ecd80f47 709 TAILQ_NEXT(vp, v_freelist), TAILQ_PREV(vp, v_freelist),
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MD
710 vp->v_mount);
711 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %ld, type %d\n",
6bae6177
MD
712 RB_EMPTY(&vp->v_rbclean_tree),
713 RB_EMPTY(&vp->v_rbdirty_tree),
81b5c339 714 vp->v_track_write.bk_active, vp->v_type);
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MD
715 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n",
716 vp->v_socket, vp->v_tag,
717 ((u_int *)vp->v_data)[0],
718 ((u_int *)vp->v_data)[1]);
719 }
720#endif
721 error = VOP_CLOSE(pmp->pm_devvp,
722 (pmp->pm_flags&MSDOSFSMNT_RONLY) ? FREAD : FREAD | FWRITE,
3b568787 723 td);
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MD
724 vrele(pmp->pm_devvp);
725 free(pmp->pm_inusemap, M_MSDOSFSFAT);
726 free(pmp, M_MSDOSFSMNT);
727 mp->mnt_data = (qaddr_t)0;
728 mp->mnt_flag &= ~MNT_LOCAL;
729 return (error);
730}
731
732static int
4625f023 733msdosfs_root(struct mount *mp, struct vnode **vpp)
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MD
734{
735 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
736 struct denode *ndep;
737 int error;
738
739#ifdef MSDOSFS_DEBUG
740 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp);
741#endif
742 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep);
743 if (error)
744 return (error);
745 *vpp = DETOV(ndep);
746 return (0);
747}
748
749static int
4625f023 750msdosfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td)
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MD
751{
752 struct msdosfsmount *pmp;
753
754 pmp = VFSTOMSDOSFS(mp);
755 sbp->f_bsize = pmp->pm_bpcluster;
756 sbp->f_iosize = pmp->pm_bpcluster;
757 sbp->f_blocks = pmp->pm_maxcluster + 1;
758 sbp->f_bfree = pmp->pm_freeclustercount;
759 sbp->f_bavail = pmp->pm_freeclustercount;
760 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */
761 sbp->f_ffree = 0; /* what to put in here? */
762 if (sbp != &mp->mnt_stat) {
763 sbp->f_type = mp->mnt_vfc->vfc_typenum;
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MD
764 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
765 }
766 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN);
767 return (0);
768}
769
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MD
770struct scaninfo {
771 int rescan;
772 int allerror;
773 int waitfor;
774 thread_t td;
775};
776
5fd012e0 777static int msdosfs_sync_scan(struct mount *mp, struct vnode *vp, void *data);
41a01a4d 778
984263bc 779static int
4625f023 780msdosfs_sync(struct mount *mp, int waitfor, struct thread *td)
984263bc 781{
984263bc 782 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
41a01a4d
MD
783 struct scaninfo scaninfo;
784 int error;
984263bc
MD
785
786 /*
787 * If we ever switch to not updating all of the fats all the time,
788 * this would be the place to update them from the first one.
789 */
790 if (pmp->pm_fmod != 0) {
791 if (pmp->pm_flags & MSDOSFSMNT_RONLY)
792 panic("msdosfs_sync: rofs mod");
793 else {
794 /* update fats here */
795 }
796 }
797 /*
798 * Write back each (modified) denode.
799 */
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MD
800 scaninfo.allerror = 0;
801 scaninfo.rescan = 1;
802 scaninfo.td = td;
803 while (scaninfo.rescan) {
804 scaninfo.rescan = 0;
5fd012e0 805 vmntvnodescan(mp, VMSC_GETVP|VMSC_NOWAIT, NULL, msdosfs_sync_scan, &scaninfo);
984263bc 806 }
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MD
807
808 /*
809 * Flush filesystem control info.
810 */
811 if (waitfor != MNT_LAZY) {
ca466bae 812 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY);
41a01a4d
MD
813 if ((error = VOP_FSYNC(pmp->pm_devvp, waitfor, td)) != 0)
814 scaninfo.allerror = error;
ca466bae 815 VOP_UNLOCK(pmp->pm_devvp, 0);
41a01a4d
MD
816 }
817 return (scaninfo.allerror);
818}
819
4625f023 820static int
5fd012e0 821msdosfs_sync_scan(struct mount *mp, struct vnode *vp, void *data)
41a01a4d
MD
822{
823 struct scaninfo *info = data;
824 struct denode *dep;
825 int error;
826
827 dep = VTODE(vp);
828 if (vp->v_type == VNON ||
829 ((dep->de_flag &
830 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 &&
6bae6177 831 (RB_EMPTY(&vp->v_rbdirty_tree) || info->waitfor == MNT_LAZY))) {
41a01a4d 832 return(0);
984263bc 833 }
41a01a4d
MD
834 if ((error = VOP_FSYNC(vp, info->waitfor, info->td)) != 0)
835 info->allerror = error;
41a01a4d 836 return(0);
984263bc
MD
837}
838
839static int
4625f023 840msdosfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp)
984263bc
MD
841{
842 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
843 struct defid *defhp = (struct defid *) fhp;
844 struct denode *dep;
845 int error;
846
847 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep);
848 if (error) {
849 *vpp = NULLVP;
850 return (error);
851 }
852 *vpp = DETOV(dep);
853 return (0);
854}
855
856static int
4625f023
CP
857msdosfs_checkexp(struct mount *mp, struct sockaddr *nam, int *exflagsp,
858 struct ucred **credanonp)
984263bc
MD
859{
860 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
861 struct netcred *np;
862
863 np = vfs_export_lookup(mp, &pmp->pm_export, nam);
864 if (np == NULL)
865 return (EACCES);
866 *exflagsp = np->netc_exflags;
867 *credanonp = &np->netc_anon;
868 return (0);
869}
870
871static int
4625f023 872msdosfs_vptofh(struct vnode *vp, struct fid *fhp)
984263bc
MD
873{
874 struct denode *dep;
875 struct defid *defhp;
876
877 dep = VTODE(vp);
878 defhp = (struct defid *)fhp;
879 defhp->defid_len = sizeof(struct defid);
880 defhp->defid_dirclust = dep->de_dirclust;
881 defhp->defid_dirofs = dep->de_diroffset;
882 /* defhp->defid_gen = dep->de_gen; */
883 return (0);
884}
885
886static struct vfsops msdosfs_vfsops = {
43c45e8f
HP
887 .vfs_mount = msdosfs_mount,
888 .vfs_unmount = msdosfs_unmount,
889 .vfs_root = msdosfs_root,
890 .vfs_statfs = msdosfs_statfs,
891 .vfs_sync = msdosfs_sync,
892 .vfs_fhtovp = msdosfs_fhtovp,
893 .vfs_checkexp = msdosfs_checkexp,
894 .vfs_vptofh = msdosfs_vptofh,
895 .vfs_init = msdosfs_init,
896 .vfs_uninit = msdosfs_uninit
984263bc
MD
897};
898
899VFS_SET(msdosfs_vfsops, msdos, 0);