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[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 $ */
715f92b6 2/* $DragonFly: src/sys/vfs/msdosfs/msdosfs_vfsops.c,v 1.16 2004/05/26 07:45:26 dillon Exp $ */
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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>
dadab5e9 56#include <sys/namei.h>
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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
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66#include "bpb.h"
67#include "bootsect.h"
68#include "direntry.h"
69#include "denode.h"
70#include "msdosfsmount.h"
71#include "fat.h"
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72
73#define MSDOSFS_DFLTBSIZE 4096
74
75#if 1 /*def PC98*/
76/*
77 * XXX - The boot signature formatted by NEC PC-98 DOS looks like a
78 * garbage or a random value :-{
79 * If you want to use that broken-signatured media, define the
80 * following symbol even though PC/AT.
81 * (ex. mount PC-98 DOS formatted FD on PC/AT)
82 */
83#define MSDOSFS_NOCHECKSIG
84#endif
85
86MALLOC_DEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOSFS mount structure");
87static MALLOC_DEFINE(M_MSDOSFSFAT, "MSDOSFS FAT", "MSDOSFS file allocation table");
88
a6ee311a
RG
89static int update_mp (struct mount *mp, struct msdosfs_args *argp);
90static int mountmsdosfs (struct vnode *devvp, struct mount *mp,
91 struct thread *td, struct msdosfs_args *argp);
92static int msdosfs_fhtovp (struct mount *, struct fid *,
93 struct vnode **);
94static int msdosfs_checkexp (struct mount *, struct sockaddr *,
95 int *, struct ucred **);
96static int msdosfs_mount (struct mount *, char *, caddr_t,
97 struct nameidata *, struct thread *);
98static int msdosfs_root (struct mount *, struct vnode **);
99static int msdosfs_statfs (struct mount *, struct statfs *,
100 struct thread *);
101static int msdosfs_sync (struct mount *, int, struct thread *);
102static int msdosfs_unmount (struct mount *, int, struct thread *);
103static int msdosfs_vptofh (struct vnode *, struct fid *);
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104
105static int
4625f023 106update_mp(struct mount *mp, struct msdosfs_args *argp)
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107{
108 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
109 int error;
110
111 pmp->pm_gid = argp->gid;
112 pmp->pm_uid = argp->uid;
113 pmp->pm_mask = argp->mask & ALLPERMS;
114 pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT;
115 if (pmp->pm_flags & MSDOSFSMNT_U2WTABLE) {
116 bcopy(argp->u2w, pmp->pm_u2w, sizeof(pmp->pm_u2w));
117 bcopy(argp->d2u, pmp->pm_d2u, sizeof(pmp->pm_d2u));
118 bcopy(argp->u2d, pmp->pm_u2d, sizeof(pmp->pm_u2d));
119 }
120 if (pmp->pm_flags & MSDOSFSMNT_ULTABLE) {
121 bcopy(argp->ul, pmp->pm_ul, sizeof(pmp->pm_ul));
122 bcopy(argp->lu, pmp->pm_lu, sizeof(pmp->pm_lu));
123 }
124
08c23b99 125#ifndef __DragonFly__
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126 /*
127 * GEMDOS knows nothing (yet) about win95
128 */
129 if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS)
130 pmp->pm_flags |= MSDOSFSMNT_NOWIN95;
131#endif
132
133 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95)
134 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME;
135 else if (!(pmp->pm_flags &
136 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) {
137 struct vnode *rootvp;
138
139 /*
140 * Try to divine whether to support Win'95 long filenames
141 */
142 if (FAT32(pmp))
143 pmp->pm_flags |= MSDOSFSMNT_LONGNAME;
144 else {
145 if ((error = msdosfs_root(mp, &rootvp)) != 0)
146 return error;
147 pmp->pm_flags |= findwin95(VTODE(rootvp))
148 ? MSDOSFSMNT_LONGNAME
149 : MSDOSFSMNT_SHORTNAME;
150 vput(rootvp);
151 }
152 }
153 return 0;
154}
155
08c23b99 156#ifndef __DragonFly__
984263bc 157int
4625f023 158msdosfs_mountroot(void)
984263bc 159{
0e99e805 160 struct mount *mp;
dadab5e9 161 struct thread *td = curthread; /* XXX */
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162 size_t size;
163 int error;
164 struct msdosfs_args args;
165
166 if (root_device->dv_class != DV_DISK)
167 return (ENODEV);
168
169 /*
170 * Get vnodes for swapdev and rootdev.
171 */
172 if (bdevvp(rootdev, &rootvp))
173 panic("msdosfs_mountroot: can't setup rootvp");
174
175 mp = malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK);
176 bzero((char *)mp, (u_long)sizeof(struct mount));
177 mp->mnt_op = &msdosfs_vfsops;
178 mp->mnt_flag = 0;
179 TAILQ_INIT(&mp->mnt_nvnodelist);
180 TAILQ_INIT(&mp->mnt_reservedvnlist);
181
182 args.flags = 0;
183 args.uid = 0;
184 args.gid = 0;
185 args.mask = 0777;
186
187 if ((error = mountmsdosfs(rootvp, mp, p, &args)) != 0) {
188 free(mp, M_MOUNT);
189 return (error);
190 }
191
192 if ((error = update_mp(mp, &args)) != 0) {
193 (void)msdosfs_unmount(mp, 0, p);
194 free(mp, M_MOUNT);
195 return (error);
196 }
197
198 if ((error = vfs_lock(mp)) != 0) {
199 (void)msdosfs_unmount(mp, 0, p);
200 free(mp, M_MOUNT);
201 return (error);
202 }
203
204 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
205 mp->mnt_vnodecovered = NULLVP;
206 (void) copystr("/", mp->mnt_stat.f_mntonname, MNAMELEN - 1,
207 &size);
208 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
209 (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
210 &size);
211 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
212 (void)msdosfs_statfs(mp, &mp->mnt_stat, p);
213 vfs_unlock(mp);
214 return (0);
215}
216#endif
217
218/*
219 * mp - path - addr in user space of mount point (ie /usr or whatever)
220 * data - addr in user space of mount params including the name of the block
221 * special file to treat as a filesystem.
222 */
223static int
4625f023
CP
224msdosfs_mount(struct mount *mp, char *path, caddr_t data, struct nameidata *ndp,
225 struct thread *td)
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226{
227 struct vnode *devvp; /* vnode for blk device to mount */
228 struct msdosfs_args args; /* will hold data from mount request */
229 /* msdosfs specific mount control block */
230 struct msdosfsmount *pmp = NULL;
231 size_t size;
232 int error, flags;
233 mode_t accessmode;
dadab5e9
MD
234 struct proc *p = td->td_proc;
235
236 KKASSERT(p);
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237
238 error = copyin(data, (caddr_t)&args, sizeof(struct msdosfs_args));
239 if (error)
240 return (error);
241 if (args.magic != MSDOSFS_ARGSMAGIC)
242 args.flags = 0;
243 /*
244 * If updating, check whether changing from read-only to
245 * read/write; if there is no device name, that's all we do.
246 */
247 if (mp->mnt_flag & MNT_UPDATE) {
248 pmp = VFSTOMSDOSFS(mp);
249 error = 0;
250 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) {
251 flags = WRITECLOSE;
252 if (mp->mnt_flag & MNT_FORCE)
253 flags |= FORCECLOSE;
254 error = vflush(mp, 0, flags);
255 }
256 if (!error && (mp->mnt_flag & MNT_RELOAD))
257 /* not yet implemented */
258 error = EOPNOTSUPP;
259 if (error)
260 return (error);
261 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
262 /*
263 * If upgrade to read-write by non-root, then verify
264 * that user has necessary permissions on the device.
265 */
266 if (p->p_ucred->cr_uid != 0) {
267 devvp = pmp->pm_devvp;
41a01a4d 268 vn_lock(devvp, NULL, LK_EXCLUSIVE | LK_RETRY, td);
984263bc 269 error = VOP_ACCESS(devvp, VREAD | VWRITE,
dadab5e9 270 p->p_ucred, td);
984263bc 271 if (error) {
41a01a4d 272 VOP_UNLOCK(devvp, NULL, 0, td);
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MD
273 return (error);
274 }
41a01a4d 275 VOP_UNLOCK(devvp, NULL, 0, td);
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MD
276 }
277 pmp->pm_flags &= ~MSDOSFSMNT_RONLY;
278 }
279 if (args.fspec == 0) {
280#ifdef __notyet__ /* doesn't work correctly with current mountd XXX */
281 if (args.flags & MSDOSFSMNT_MNTOPT) {
282 pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT;
283 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT;
284 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95)
285 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME;
286 }
287#endif
288 /*
289 * Process export requests.
290 */
291 return (vfs_export(mp, &pmp->pm_export, &args.export));
292 }
293 }
294 /*
295 * Not an update, or updating the name: look up the name
296 * and verify that it refers to a sensible block device.
297 */
2b69e610 298 NDINIT(ndp, NAMEI_LOOKUP, CNP_FOLLOW, UIO_USERSPACE, args.fspec, td);
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MD
299 error = namei(ndp);
300 if (error)
301 return (error);
302 devvp = ndp->ni_vp;
303 NDFREE(ndp, NDF_ONLY_PNBUF);
304
305 if (!vn_isdisk(devvp, &error)) {
306 vrele(devvp);
307 return (error);
308 }
309 /*
310 * If mount by non-root, then verify that user has necessary
311 * permissions on the device.
312 */
313 if (p->p_ucred->cr_uid != 0) {
314 accessmode = VREAD;
315 if ((mp->mnt_flag & MNT_RDONLY) == 0)
316 accessmode |= VWRITE;
41a01a4d 317 vn_lock(devvp, NULL, LK_EXCLUSIVE | LK_RETRY, td);
dadab5e9 318 error = VOP_ACCESS(devvp, accessmode, p->p_ucred, td);
984263bc
MD
319 if (error) {
320 vput(devvp);
321 return (error);
322 }
41a01a4d 323 VOP_UNLOCK(devvp, NULL, 0, td);
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MD
324 }
325 if ((mp->mnt_flag & MNT_UPDATE) == 0) {
dadab5e9 326 error = mountmsdosfs(devvp, mp, td, &args);
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MD
327#ifdef MSDOSFS_DEBUG /* only needed for the printf below */
328 pmp = VFSTOMSDOSFS(mp);
329#endif
330 } else {
331 if (devvp != pmp->pm_devvp)
332 error = EINVAL; /* XXX needs translation */
333 else
334 vrele(devvp);
335 }
336 if (error) {
337 vrele(devvp);
338 return (error);
339 }
340
341 error = update_mp(mp, &args);
342 if (error) {
dadab5e9 343 msdosfs_unmount(mp, MNT_FORCE, td);
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MD
344 return error;
345 }
346
347 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
348 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
349 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
350 &size);
351 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
dadab5e9 352 (void) msdosfs_statfs(mp, &mp->mnt_stat, td);
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MD
353#ifdef MSDOSFS_DEBUG
354 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap);
355#endif
356 return (0);
357}
358
359static int
4625f023
CP
360mountmsdosfs(struct vnode *devvp, struct mount *mp, struct thread *td,
361 struct msdosfs_args *argp)
984263bc
MD
362{
363 struct msdosfsmount *pmp;
364 struct buf *bp;
e4c9c0c8 365 dev_t dev;
08c23b99 366#ifndef __DragonFly__
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MD
367 struct partinfo dpart;
368 int bsize = 0, dtype = 0, tmp;
369#endif
370 union bootsector *bsp;
371 struct byte_bpb33 *b33;
372 struct byte_bpb50 *b50;
373 struct byte_bpb710 *b710;
374 u_int8_t SecPerClust;
375 u_long clusters;
376 int ronly, error;
377
378 /*
379 * Disallow multiple mounts of the same device.
380 * Disallow mounting of a device that is currently in use
381 * (except for root, which might share swap device for miniroot).
382 * Flush out any old buffers remaining from a previous use.
383 */
384 error = vfs_mountedon(devvp);
385 if (error)
386 return (error);
715f92b6 387 if (count_udev(devvp->v_udev) > 0 && devvp != rootvp)
984263bc 388 return (EBUSY);
41a01a4d 389 vn_lock(devvp, NULL, LK_EXCLUSIVE | LK_RETRY, td);
3b568787 390 error = vinvalbuf(devvp, V_SAVE, td, 0, 0);
41a01a4d 391 VOP_UNLOCK(devvp, NULL, 0, td);
984263bc
MD
392 if (error)
393 return (error);
394
395 ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
41a01a4d 396 vn_lock(devvp, NULL, LK_EXCLUSIVE | LK_RETRY, td);
dadab5e9 397 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, td);
41a01a4d 398 VOP_UNLOCK(devvp, NULL, 0, td);
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MD
399 if (error)
400 return (error);
e4c9c0c8 401 dev = devvp->v_rdev;
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MD
402 bp = NULL; /* both used in error_exit */
403 pmp = NULL;
404
08c23b99 405#ifndef __DragonFly__
984263bc
MD
406 if (argp->flags & MSDOSFSMNT_GEMDOSFS) {
407 /*
408 * We need the disklabel to calculate the size of a FAT entry
409 * later on. Also make sure the partition contains a filesystem
410 * of type FS_MSDOS. This doesn't work for floppies, so we have
411 * to check for them too.
412 *
413 * At least some parts of the msdos fs driver seem to assume
414 * that the size of a disk block will always be 512 bytes.
415 * Let's check it...
416 */
3b568787 417 error = VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, td);
984263bc
MD
418 if (error)
419 goto error_exit;
420 tmp = dpart.part->p_fstype;
421 dtype = dpart.disklab->d_type;
422 bsize = dpart.disklab->d_secsize;
423 if (bsize != 512 || (dtype!=DTYPE_FLOPPY && tmp!=FS_MSDOS)) {
424 error = EINVAL;
425 goto error_exit;
426 }
427 }
428#endif
429
430 /*
431 * Read the boot sector of the filesystem, and then check the
432 * boot signature. If not a dos boot sector then error out.
433 *
434 * NOTE: 2048 is a maximum sector size in current...
435 */
3b568787 436 error = bread(devvp, 0, 2048, &bp);
984263bc
MD
437 if (error)
438 goto error_exit;
439 bp->b_flags |= B_AGE;
440 bsp = (union bootsector *)bp->b_data;
441 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB;
442 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB;
443 b710 = (struct byte_bpb710 *)bsp->bs710.bsPBP;
444
08c23b99 445#ifndef __DragonFly__
984263bc
MD
446 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) {
447#endif
448#ifndef MSDOSFS_NOCHECKSIG
449 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0
450 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) {
451 error = EINVAL;
452 goto error_exit;
453 }
454#endif
08c23b99 455#ifndef __DragonFly__
984263bc
MD
456 }
457#endif
458
459 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK);
460 bzero((caddr_t)pmp, sizeof *pmp);
461 pmp->pm_mountp = mp;
462
463 /*
464 * Compute several useful quantities from the bpb in the
465 * bootsector. Copy in the dos 5 variant of the bpb then fix up
466 * the fields that are different between dos 5 and dos 3.3.
467 */
468 SecPerClust = b50->bpbSecPerClust;
469 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec);
470 pmp->pm_ResSectors = getushort(b50->bpbResSectors);
471 pmp->pm_FATs = b50->bpbFATs;
472 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts);
473 pmp->pm_Sectors = getushort(b50->bpbSectors);
474 pmp->pm_FATsecs = getushort(b50->bpbFATsecs);
475 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack);
476 pmp->pm_Heads = getushort(b50->bpbHeads);
477 pmp->pm_Media = b50->bpbMedia;
478
479 /* calculate the ratio of sector size to DEV_BSIZE */
480 pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE;
481
08c23b99 482#ifndef __DragonFly__
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MD
483 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) {
484#endif
485 /* XXX - We should probably check more values here */
486 if (!pmp->pm_BytesPerSec || !SecPerClust
fab3e130 487 || !pmp->pm_Heads
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488#ifdef PC98
489 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 255) {
490#else
491 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 63) {
492#endif
493 error = EINVAL;
494 goto error_exit;
495 }
08c23b99 496#ifndef __DragonFly__
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MD
497 }
498#endif
499
500 if (pmp->pm_Sectors == 0) {
501 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs);
502 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors);
503 } else {
504 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs);
505 pmp->pm_HugeSectors = pmp->pm_Sectors;
506 }
507 if (pmp->pm_HugeSectors > 0xffffffff /
508 (pmp->pm_BytesPerSec / sizeof(struct direntry)) + 1) {
509 /*
510 * We cannot deal currently with this size of disk
511 * due to fileid limitations (see msdosfs_getattr and
512 * msdosfs_readdir)
513 */
514 error = EINVAL;
515 printf("mountmsdosfs(): disk too big, sorry\n");
516 goto error_exit;
517 }
518
519 if (pmp->pm_RootDirEnts == 0) {
520 if (bsp->bs710.bsBootSectSig2 != BOOTSIG2
521 || bsp->bs710.bsBootSectSig3 != BOOTSIG3
522 || pmp->pm_Sectors
523 || pmp->pm_FATsecs
524 || getushort(b710->bpbFSVers)) {
525 error = EINVAL;
526 printf("mountmsdosfs(): bad FAT32 filesystem\n");
527 goto error_exit;
528 }
529 pmp->pm_fatmask = FAT32_MASK;
530 pmp->pm_fatmult = 4;
531 pmp->pm_fatdiv = 1;
532 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs);
533 if (getushort(b710->bpbExtFlags) & FATMIRROR)
534 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM;
535 else
536 pmp->pm_flags |= MSDOSFS_FATMIRROR;
537 } else
538 pmp->pm_flags |= MSDOSFS_FATMIRROR;
539
540 /*
541 * Check a few values (could do some more):
542 * - logical sector size: power of 2, >= block size
543 * - sectors per cluster: power of 2, >= 1
544 * - number of sectors: >= 1, <= size of partition
545 */
546 if ( (SecPerClust == 0)
547 || (SecPerClust & (SecPerClust - 1))
548 || (pmp->pm_BytesPerSec < DEV_BSIZE)
549 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1))
550 || (pmp->pm_HugeSectors == 0)
551 ) {
552 error = EINVAL;
553 goto error_exit;
554 }
555
556 pmp->pm_HugeSectors *= pmp->pm_BlkPerSec;
557 pmp->pm_HiddenSects *= pmp->pm_BlkPerSec; /* XXX not used? */
558 pmp->pm_FATsecs *= pmp->pm_BlkPerSec;
559 SecPerClust *= pmp->pm_BlkPerSec;
560
561 pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec;
562
563 if (FAT32(pmp)) {
564 pmp->pm_rootdirblk = getulong(b710->bpbRootClust);
565 pmp->pm_firstcluster = pmp->pm_fatblk
566 + (pmp->pm_FATs * pmp->pm_FATsecs);
567 pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec;
568 } else {
569 pmp->pm_rootdirblk = pmp->pm_fatblk +
570 (pmp->pm_FATs * pmp->pm_FATsecs);
571 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry)
572 + DEV_BSIZE - 1)
573 / DEV_BSIZE; /* in blocks */
574 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize;
575 }
576
577 pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) /
578 SecPerClust + 1;
579 pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE; /* XXX not used? */
580
08c23b99 581#ifndef __DragonFly__
984263bc
MD
582 if (argp->flags & MSDOSFSMNT_GEMDOSFS) {
583 if ((pmp->pm_maxcluster <= (0xff0 - 2))
584 && ((dtype == DTYPE_FLOPPY) || ((dtype == DTYPE_VNODE)
585 && ((pmp->pm_Heads == 1) || (pmp->pm_Heads == 2))))
586 ) {
587 pmp->pm_fatmask = FAT12_MASK;
588 pmp->pm_fatmult = 3;
589 pmp->pm_fatdiv = 2;
590 } else {
591 pmp->pm_fatmask = FAT16_MASK;
592 pmp->pm_fatmult = 2;
593 pmp->pm_fatdiv = 1;
594 }
595 } else
596#endif
597 if (pmp->pm_fatmask == 0) {
598 if (pmp->pm_maxcluster
599 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) {
600 /*
601 * This will usually be a floppy disk. This size makes
602 * sure that one fat entry will not be split across
603 * multiple blocks.
604 */
605 pmp->pm_fatmask = FAT12_MASK;
606 pmp->pm_fatmult = 3;
607 pmp->pm_fatdiv = 2;
608 } else {
609 pmp->pm_fatmask = FAT16_MASK;
610 pmp->pm_fatmult = 2;
611 pmp->pm_fatdiv = 1;
612 }
613 }
614
615 clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv;
616 if (pmp->pm_maxcluster >= clusters) {
617 printf("Warning: number of clusters (%ld) exceeds FAT "
618 "capacity (%ld)\n", pmp->pm_maxcluster + 1, clusters);
619 pmp->pm_maxcluster = clusters - 1;
620 }
621
622
623 if (FAT12(pmp))
624 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec;
625 else
626 pmp->pm_fatblocksize = MSDOSFS_DFLTBSIZE;
627
628 pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE;
629 pmp->pm_bnshift = ffs(DEV_BSIZE) - 1;
630
631 /*
632 * Compute mask and shift value for isolating cluster relative byte
633 * offsets and cluster numbers from a file offset.
634 */
635 pmp->pm_bpcluster = SecPerClust * DEV_BSIZE;
636 pmp->pm_crbomask = pmp->pm_bpcluster - 1;
637 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1;
638
639 /*
640 * Check for valid cluster size
641 * must be a power of 2
642 */
643 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) {
644 error = EINVAL;
645 goto error_exit;
646 }
647
648 /*
649 * Release the bootsector buffer.
650 */
651 brelse(bp);
652 bp = NULL;
653
654 /*
655 * Check FSInfo.
656 */
657 if (pmp->pm_fsinfo) {
658 struct fsinfo *fp;
659
3b568787 660 if ((error = bread(devvp, pmp->pm_fsinfo, fsi_size(pmp), &bp)) != 0)
984263bc
MD
661 goto error_exit;
662 fp = (struct fsinfo *)bp->b_data;
663 if (!bcmp(fp->fsisig1, "RRaA", 4)
664 && !bcmp(fp->fsisig2, "rrAa", 4)
665 && !bcmp(fp->fsisig3, "\0\0\125\252", 4)
50c068cf 666 && !bcmp(fp->fsisig4, "\0\0\125\252", 4)) {
984263bc 667 pmp->pm_nxtfree = getulong(fp->fsinxtfree);
50c068cf
CP
668 if (pmp->pm_nxtfree == 0xffffffff)
669 pmp->pm_nxtfree = CLUST_FIRST;
670 } else
984263bc
MD
671 pmp->pm_fsinfo = 0;
672 brelse(bp);
673 bp = NULL;
674 }
675
676 /*
677 * Check and validate (or perhaps invalidate?) the fsinfo structure?
678 */
679 if (pmp->pm_fsinfo && pmp->pm_nxtfree > pmp->pm_maxcluster) {
680 printf(
681 "Next free cluster in FSInfo (%lu) exceeds maxcluster (%lu)\n",
682 pmp->pm_nxtfree, pmp->pm_maxcluster);
683 error = EINVAL;
684 goto error_exit;
685 }
686
687 /*
688 * Allocate memory for the bitmap of allocated clusters, and then
689 * fill it in.
690 */
691 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1)
692 / N_INUSEBITS)
693 * sizeof(*pmp->pm_inusemap),
694 M_MSDOSFSFAT, M_WAITOK);
695
696 /*
697 * fillinusemap() needs pm_devvp.
698 */
699 pmp->pm_dev = dev;
700 pmp->pm_devvp = devvp;
701
702 /*
703 * Have the inuse map filled in.
704 */
705 if ((error = fillinusemap(pmp)) != 0)
706 goto error_exit;
707
708 /*
709 * If they want fat updates to be synchronous then let them suffer
710 * the performance degradation in exchange for the on disk copy of
711 * the fat being correct just about all the time. I suppose this
712 * would be a good thing to turn on if the kernel is still flakey.
713 */
714 if (mp->mnt_flag & MNT_SYNCHRONOUS)
715 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT;
716
717 /*
718 * Finish up.
719 */
720 if (ronly)
721 pmp->pm_flags |= MSDOSFSMNT_RONLY;
722 else
723 pmp->pm_fmod = 1;
724 mp->mnt_data = (qaddr_t) pmp;
725 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
726 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
727 mp->mnt_flag |= MNT_LOCAL;
e4c9c0c8 728 dev->si_mountpoint = mp;
984263bc
MD
729
730 return 0;
731
732error_exit:
733 if (bp)
734 brelse(bp);
3b568787 735 (void) VOP_CLOSE(devvp, ronly ? FREAD : FREAD | FWRITE, td);
984263bc
MD
736 if (pmp) {
737 if (pmp->pm_inusemap)
738 free(pmp->pm_inusemap, M_MSDOSFSFAT);
739 free(pmp, M_MSDOSFSMNT);
740 mp->mnt_data = (qaddr_t)0;
741 }
742 return (error);
743}
744
745/*
746 * Unmount the filesystem described by mp.
747 */
748static int
4625f023 749msdosfs_unmount(struct mount *mp, int mntflags, struct thread *td)
984263bc
MD
750{
751 struct msdosfsmount *pmp;
752 int error, flags;
753
754 flags = 0;
755 if (mntflags & MNT_FORCE)
756 flags |= FORCECLOSE;
757 error = vflush(mp, 0, flags);
758 if (error)
759 return error;
760 pmp = VFSTOMSDOSFS(mp);
e4c9c0c8 761 pmp->pm_devvp->v_rdev->si_mountpoint = NULL;
984263bc
MD
762#ifdef MSDOSFS_DEBUG
763 {
764 struct vnode *vp = pmp->pm_devvp;
765
766 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n");
767 printf("flag %08lx, usecount %d, writecount %d, holdcnt %ld\n",
768 vp->v_flag, vp->v_usecount, vp->v_writecount, vp->v_holdcnt);
769 printf("id %lu, mount %p, op %p\n",
770 vp->v_id, vp->v_mount, vp->v_op);
771 printf("freef %p, freeb %p, mount %p\n",
772 vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev,
773 vp->v_mount);
774 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %ld, type %d\n",
775 TAILQ_FIRST(&vp->v_cleanblkhd),
776 TAILQ_FIRST(&vp->v_dirtyblkhd),
777 vp->v_numoutput, vp->v_type);
778 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n",
779 vp->v_socket, vp->v_tag,
780 ((u_int *)vp->v_data)[0],
781 ((u_int *)vp->v_data)[1]);
782 }
783#endif
784 error = VOP_CLOSE(pmp->pm_devvp,
785 (pmp->pm_flags&MSDOSFSMNT_RONLY) ? FREAD : FREAD | FWRITE,
3b568787 786 td);
984263bc
MD
787 vrele(pmp->pm_devvp);
788 free(pmp->pm_inusemap, M_MSDOSFSFAT);
789 free(pmp, M_MSDOSFSMNT);
790 mp->mnt_data = (qaddr_t)0;
791 mp->mnt_flag &= ~MNT_LOCAL;
792 return (error);
793}
794
795static int
4625f023 796msdosfs_root(struct mount *mp, struct vnode **vpp)
984263bc
MD
797{
798 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
799 struct denode *ndep;
800 int error;
801
802#ifdef MSDOSFS_DEBUG
803 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp);
804#endif
805 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep);
806 if (error)
807 return (error);
808 *vpp = DETOV(ndep);
809 return (0);
810}
811
812static int
4625f023 813msdosfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td)
984263bc
MD
814{
815 struct msdosfsmount *pmp;
816
817 pmp = VFSTOMSDOSFS(mp);
818 sbp->f_bsize = pmp->pm_bpcluster;
819 sbp->f_iosize = pmp->pm_bpcluster;
820 sbp->f_blocks = pmp->pm_maxcluster + 1;
821 sbp->f_bfree = pmp->pm_freeclustercount;
822 sbp->f_bavail = pmp->pm_freeclustercount;
823 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */
824 sbp->f_ffree = 0; /* what to put in here? */
825 if (sbp != &mp->mnt_stat) {
826 sbp->f_type = mp->mnt_vfc->vfc_typenum;
827 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
828 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
829 }
830 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN);
831 return (0);
832}
833
41a01a4d
MD
834struct scaninfo {
835 int rescan;
836 int allerror;
837 int waitfor;
838 thread_t td;
839};
840
841static int msdosfs_sync_scan(struct mount *mp, struct vnode *vp,
842 lwkt_tokref_t vlock, void *data);
843
984263bc 844static int
4625f023 845msdosfs_sync(struct mount *mp, int waitfor, struct thread *td)
984263bc 846{
984263bc 847 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
41a01a4d
MD
848 struct scaninfo scaninfo;
849 int error;
984263bc
MD
850
851 /*
852 * If we ever switch to not updating all of the fats all the time,
853 * this would be the place to update them from the first one.
854 */
855 if (pmp->pm_fmod != 0) {
856 if (pmp->pm_flags & MSDOSFSMNT_RONLY)
857 panic("msdosfs_sync: rofs mod");
858 else {
859 /* update fats here */
860 }
861 }
862 /*
863 * Write back each (modified) denode.
864 */
41a01a4d
MD
865 scaninfo.allerror = 0;
866 scaninfo.rescan = 1;
867 scaninfo.td = td;
868 while (scaninfo.rescan) {
869 scaninfo.rescan = 0;
870 vmntvnodescan(mp, NULL, msdosfs_sync_scan, &scaninfo);
984263bc 871 }
984263bc
MD
872
873 /*
874 * Flush filesystem control info.
875 */
876 if (waitfor != MNT_LAZY) {
41a01a4d
MD
877 vn_lock(pmp->pm_devvp, NULL, LK_EXCLUSIVE | LK_RETRY, td);
878 if ((error = VOP_FSYNC(pmp->pm_devvp, waitfor, td)) != 0)
879 scaninfo.allerror = error;
880 VOP_UNLOCK(pmp->pm_devvp, NULL, 0, td);
881 }
882 return (scaninfo.allerror);
883}
884
4625f023
CP
885static int
886msdosfs_sync_scan(struct mount *mp, struct vnode *vp,
887 lwkt_tokref_t vlock, void *data)
41a01a4d
MD
888{
889 struct scaninfo *info = data;
890 struct denode *dep;
891 int error;
892
893 dep = VTODE(vp);
894 if (vp->v_type == VNON ||
895 ((dep->de_flag &
896 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 &&
897 (TAILQ_EMPTY(&vp->v_dirtyblkhd) || info->waitfor == MNT_LAZY))) {
898 lwkt_reltoken(vlock);
899 return(0);
900 }
901 error = vget(vp, vlock, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, info->td);
902 if (error) {
903 if (error == ENOENT)
904 info->rescan = 1;
905 return(0);
984263bc 906 }
41a01a4d
MD
907 if ((error = VOP_FSYNC(vp, info->waitfor, info->td)) != 0)
908 info->allerror = error;
909 VOP_UNLOCK(vp, NULL, 0, info->td);
910 vrele(vp);
911 return(0);
984263bc
MD
912}
913
914static int
4625f023 915msdosfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp)
984263bc
MD
916{
917 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
918 struct defid *defhp = (struct defid *) fhp;
919 struct denode *dep;
920 int error;
921
922 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep);
923 if (error) {
924 *vpp = NULLVP;
925 return (error);
926 }
927 *vpp = DETOV(dep);
928 return (0);
929}
930
931static int
4625f023
CP
932msdosfs_checkexp(struct mount *mp, struct sockaddr *nam, int *exflagsp,
933 struct ucred **credanonp)
984263bc
MD
934{
935 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
936 struct netcred *np;
937
938 np = vfs_export_lookup(mp, &pmp->pm_export, nam);
939 if (np == NULL)
940 return (EACCES);
941 *exflagsp = np->netc_exflags;
942 *credanonp = &np->netc_anon;
943 return (0);
944}
945
946static int
4625f023 947msdosfs_vptofh(struct vnode *vp, struct fid *fhp)
984263bc
MD
948{
949 struct denode *dep;
950 struct defid *defhp;
951
952 dep = VTODE(vp);
953 defhp = (struct defid *)fhp;
954 defhp->defid_len = sizeof(struct defid);
955 defhp->defid_dirclust = dep->de_dirclust;
956 defhp->defid_dirofs = dep->de_diroffset;
957 /* defhp->defid_gen = dep->de_gen; */
958 return (0);
959}
960
961static struct vfsops msdosfs_vfsops = {
962 msdosfs_mount,
963 vfs_stdstart,
964 msdosfs_unmount,
965 msdosfs_root,
966 vfs_stdquotactl,
967 msdosfs_statfs,
968 msdosfs_sync,
969 vfs_stdvget,
970 msdosfs_fhtovp,
971 msdosfs_checkexp,
972 msdosfs_vptofh,
973 msdosfs_init,
974 msdosfs_uninit,
975 vfs_stdextattrctl,
976};
977
978VFS_SET(msdosfs_vfsops, msdos, 0);