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[dragonfly.git] / sys / vfs / msdosfs / msdosfs_vfsops.c
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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 $ */
5fd012e0 2/* $DragonFly: src/sys/vfs/msdosfs/msdosfs_vfsops.c,v 1.20 2004/10/12 19:21:00 dillon Exp $ */
984263bc
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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"
984263bc 72
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73extern struct vnodeopv_entry_desc msdosfs_vnodeop_entries[];
74
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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
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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
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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 *);
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106
107static int
4625f023 108update_mp(struct mount *mp, struct msdosfs_args *argp)
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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__
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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
08c23b99 158#ifndef __DragonFly__
984263bc 159int
4625f023 160msdosfs_mountroot(void)
984263bc 161{
0e99e805 162 struct mount *mp;
dadab5e9 163 struct thread *td = curthread; /* XXX */
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164 size_t size;
165 int error;
166 struct msdosfs_args args;
21739618 167 struct vnode *rootvp;
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168
169 if (root_device->dv_class != DV_DISK)
170 return (ENODEV);
171
172 /*
173 * Get vnodes for swapdev and rootdev.
174 */
175 if (bdevvp(rootdev, &rootvp))
176 panic("msdosfs_mountroot: can't setup rootvp");
177
178 mp = malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK);
179 bzero((char *)mp, (u_long)sizeof(struct mount));
180 mp->mnt_op = &msdosfs_vfsops;
181 mp->mnt_flag = 0;
182 TAILQ_INIT(&mp->mnt_nvnodelist);
183 TAILQ_INIT(&mp->mnt_reservedvnlist);
184
185 args.flags = 0;
186 args.uid = 0;
187 args.gid = 0;
188 args.mask = 0777;
189
190 if ((error = mountmsdosfs(rootvp, mp, p, &args)) != 0) {
191 free(mp, M_MOUNT);
192 return (error);
193 }
194
195 if ((error = update_mp(mp, &args)) != 0) {
196 (void)msdosfs_unmount(mp, 0, p);
197 free(mp, M_MOUNT);
198 return (error);
199 }
200
201 if ((error = vfs_lock(mp)) != 0) {
202 (void)msdosfs_unmount(mp, 0, p);
203 free(mp, M_MOUNT);
204 return (error);
205 }
206
207 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
208 mp->mnt_vnodecovered = NULLVP;
209 (void) copystr("/", mp->mnt_stat.f_mntonname, MNAMELEN - 1,
210 &size);
211 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
212 (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
213 &size);
214 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
0961aa92 215
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216 (void)msdosfs_statfs(mp, &mp->mnt_stat, p);
217 vfs_unlock(mp);
218 return (0);
219}
220#endif
221
222/*
223 * mp - path - addr in user space of mount point (ie /usr or whatever)
224 * data - addr in user space of mount params including the name of the block
225 * special file to treat as a filesystem.
226 */
227static int
21739618 228msdosfs_mount(struct mount *mp, char *path, caddr_t data, struct thread *td)
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229{
230 struct vnode *devvp; /* vnode for blk device to mount */
231 struct msdosfs_args args; /* will hold data from mount request */
232 /* msdosfs specific mount control block */
233 struct msdosfsmount *pmp = NULL;
234 size_t size;
235 int error, flags;
236 mode_t accessmode;
dadab5e9 237 struct proc *p = td->td_proc;
21739618 238 struct nameidata nd;
dadab5e9
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239
240 KKASSERT(p);
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241
242 error = copyin(data, (caddr_t)&args, sizeof(struct msdosfs_args));
243 if (error)
244 return (error);
245 if (args.magic != MSDOSFS_ARGSMAGIC)
246 args.flags = 0;
247 /*
248 * If updating, check whether changing from read-only to
249 * read/write; if there is no device name, that's all we do.
250 */
251 if (mp->mnt_flag & MNT_UPDATE) {
252 pmp = VFSTOMSDOSFS(mp);
253 error = 0;
254 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) {
255 flags = WRITECLOSE;
256 if (mp->mnt_flag & MNT_FORCE)
257 flags |= FORCECLOSE;
258 error = vflush(mp, 0, flags);
259 }
260 if (!error && (mp->mnt_flag & MNT_RELOAD))
261 /* not yet implemented */
262 error = EOPNOTSUPP;
263 if (error)
264 return (error);
265 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
266 /*
267 * If upgrade to read-write by non-root, then verify
268 * that user has necessary permissions on the device.
269 */
270 if (p->p_ucred->cr_uid != 0) {
271 devvp = pmp->pm_devvp;
5fd012e0 272 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
984263bc 273 error = VOP_ACCESS(devvp, VREAD | VWRITE,
dadab5e9 274 p->p_ucred, td);
984263bc 275 if (error) {
5fd012e0 276 VOP_UNLOCK(devvp, 0, td);
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MD
277 return (error);
278 }
5fd012e0 279 VOP_UNLOCK(devvp, 0, td);
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280 }
281 pmp->pm_flags &= ~MSDOSFSMNT_RONLY;
282 }
283 if (args.fspec == 0) {
284#ifdef __notyet__ /* doesn't work correctly with current mountd XXX */
285 if (args.flags & MSDOSFSMNT_MNTOPT) {
286 pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT;
287 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT;
288 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95)
289 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME;
290 }
291#endif
292 /*
293 * Process export requests.
294 */
295 return (vfs_export(mp, &pmp->pm_export, &args.export));
296 }
297 }
298 /*
299 * Not an update, or updating the name: look up the name
300 * and verify that it refers to a sensible block device.
301 */
21739618
MD
302 NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW, UIO_USERSPACE, args.fspec, td);
303 error = namei(&nd);
984263bc
MD
304 if (error)
305 return (error);
21739618
MD
306 devvp = nd.ni_vp;
307 NDFREE(&nd, NDF_ONLY_PNBUF);
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MD
308
309 if (!vn_isdisk(devvp, &error)) {
310 vrele(devvp);
311 return (error);
312 }
313 /*
314 * If mount by non-root, then verify that user has necessary
315 * permissions on the device.
316 */
317 if (p->p_ucred->cr_uid != 0) {
318 accessmode = VREAD;
319 if ((mp->mnt_flag & MNT_RDONLY) == 0)
320 accessmode |= VWRITE;
5fd012e0 321 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
dadab5e9 322 error = VOP_ACCESS(devvp, accessmode, p->p_ucred, td);
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MD
323 if (error) {
324 vput(devvp);
325 return (error);
326 }
5fd012e0 327 VOP_UNLOCK(devvp, 0, td);
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MD
328 }
329 if ((mp->mnt_flag & MNT_UPDATE) == 0) {
dadab5e9 330 error = mountmsdosfs(devvp, mp, td, &args);
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331#ifdef MSDOSFS_DEBUG /* only needed for the printf below */
332 pmp = VFSTOMSDOSFS(mp);
333#endif
334 } else {
335 if (devvp != pmp->pm_devvp)
336 error = EINVAL; /* XXX needs translation */
337 else
338 vrele(devvp);
339 }
340 if (error) {
341 vrele(devvp);
342 return (error);
343 }
344
345 error = update_mp(mp, &args);
346 if (error) {
dadab5e9 347 msdosfs_unmount(mp, MNT_FORCE, td);
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MD
348 return error;
349 }
350
351 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
352 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
353 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
354 &size);
355 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
dadab5e9 356 (void) msdosfs_statfs(mp, &mp->mnt_stat, td);
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357#ifdef MSDOSFS_DEBUG
358 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap);
359#endif
360 return (0);
361}
362
363static int
4625f023
CP
364mountmsdosfs(struct vnode *devvp, struct mount *mp, struct thread *td,
365 struct msdosfs_args *argp)
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MD
366{
367 struct msdosfsmount *pmp;
368 struct buf *bp;
e4c9c0c8 369 dev_t dev;
08c23b99 370#ifndef __DragonFly__
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371 struct partinfo dpart;
372 int bsize = 0, dtype = 0, tmp;
373#endif
374 union bootsector *bsp;
375 struct byte_bpb33 *b33;
376 struct byte_bpb50 *b50;
377 struct byte_bpb710 *b710;
378 u_int8_t SecPerClust;
379 u_long clusters;
380 int ronly, error;
381
382 /*
383 * Disallow multiple mounts of the same device.
384 * Disallow mounting of a device that is currently in use
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385 * Flush out any old buffers remaining from a previous use.
386 */
387 error = vfs_mountedon(devvp);
388 if (error)
389 return (error);
21739618 390 if (count_udev(devvp->v_udev) > 0)
984263bc 391 return (EBUSY);
5fd012e0 392 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
3b568787 393 error = vinvalbuf(devvp, V_SAVE, td, 0, 0);
5fd012e0 394 VOP_UNLOCK(devvp, 0, td);
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MD
395 if (error)
396 return (error);
397
398 ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
5fd012e0 399 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
dadab5e9 400 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, td);
5fd012e0 401 VOP_UNLOCK(devvp, 0, td);
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402 if (error)
403 return (error);
e4c9c0c8 404 dev = devvp->v_rdev;
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405 bp = NULL; /* both used in error_exit */
406 pmp = NULL;
407
08c23b99 408#ifndef __DragonFly__
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409 if (argp->flags & MSDOSFSMNT_GEMDOSFS) {
410 /*
411 * We need the disklabel to calculate the size of a FAT entry
412 * later on. Also make sure the partition contains a filesystem
413 * of type FS_MSDOS. This doesn't work for floppies, so we have
414 * to check for them too.
415 *
416 * At least some parts of the msdos fs driver seem to assume
417 * that the size of a disk block will always be 512 bytes.
418 * Let's check it...
419 */
3b568787 420 error = VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, td);
984263bc
MD
421 if (error)
422 goto error_exit;
423 tmp = dpart.part->p_fstype;
424 dtype = dpart.disklab->d_type;
425 bsize = dpart.disklab->d_secsize;
426 if (bsize != 512 || (dtype!=DTYPE_FLOPPY && tmp!=FS_MSDOS)) {
427 error = EINVAL;
428 goto error_exit;
429 }
430 }
431#endif
432
433 /*
434 * Read the boot sector of the filesystem, and then check the
435 * boot signature. If not a dos boot sector then error out.
436 *
437 * NOTE: 2048 is a maximum sector size in current...
438 */
3b568787 439 error = bread(devvp, 0, 2048, &bp);
984263bc
MD
440 if (error)
441 goto error_exit;
442 bp->b_flags |= B_AGE;
443 bsp = (union bootsector *)bp->b_data;
444 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB;
445 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB;
446 b710 = (struct byte_bpb710 *)bsp->bs710.bsPBP;
447
08c23b99 448#ifndef __DragonFly__
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449 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) {
450#endif
451#ifndef MSDOSFS_NOCHECKSIG
452 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0
453 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) {
454 error = EINVAL;
455 goto error_exit;
456 }
457#endif
08c23b99 458#ifndef __DragonFly__
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459 }
460#endif
461
462 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK);
463 bzero((caddr_t)pmp, sizeof *pmp);
464 pmp->pm_mountp = mp;
465
466 /*
467 * Compute several useful quantities from the bpb in the
468 * bootsector. Copy in the dos 5 variant of the bpb then fix up
469 * the fields that are different between dos 5 and dos 3.3.
470 */
471 SecPerClust = b50->bpbSecPerClust;
472 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec);
473 pmp->pm_ResSectors = getushort(b50->bpbResSectors);
474 pmp->pm_FATs = b50->bpbFATs;
475 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts);
476 pmp->pm_Sectors = getushort(b50->bpbSectors);
477 pmp->pm_FATsecs = getushort(b50->bpbFATsecs);
478 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack);
479 pmp->pm_Heads = getushort(b50->bpbHeads);
480 pmp->pm_Media = b50->bpbMedia;
481
482 /* calculate the ratio of sector size to DEV_BSIZE */
483 pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE;
484
08c23b99 485#ifndef __DragonFly__
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486 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) {
487#endif
488 /* XXX - We should probably check more values here */
489 if (!pmp->pm_BytesPerSec || !SecPerClust
fab3e130 490 || !pmp->pm_Heads
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491#ifdef PC98
492 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 255) {
493#else
494 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 63) {
495#endif
496 error = EINVAL;
497 goto error_exit;
498 }
08c23b99 499#ifndef __DragonFly__
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500 }
501#endif
502
503 if (pmp->pm_Sectors == 0) {
504 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs);
505 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors);
506 } else {
507 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs);
508 pmp->pm_HugeSectors = pmp->pm_Sectors;
509 }
510 if (pmp->pm_HugeSectors > 0xffffffff /
511 (pmp->pm_BytesPerSec / sizeof(struct direntry)) + 1) {
512 /*
513 * We cannot deal currently with this size of disk
514 * due to fileid limitations (see msdosfs_getattr and
515 * msdosfs_readdir)
516 */
517 error = EINVAL;
518 printf("mountmsdosfs(): disk too big, sorry\n");
519 goto error_exit;
520 }
521
522 if (pmp->pm_RootDirEnts == 0) {
523 if (bsp->bs710.bsBootSectSig2 != BOOTSIG2
524 || bsp->bs710.bsBootSectSig3 != BOOTSIG3
525 || pmp->pm_Sectors
526 || pmp->pm_FATsecs
527 || getushort(b710->bpbFSVers)) {
528 error = EINVAL;
529 printf("mountmsdosfs(): bad FAT32 filesystem\n");
530 goto error_exit;
531 }
532 pmp->pm_fatmask = FAT32_MASK;
533 pmp->pm_fatmult = 4;
534 pmp->pm_fatdiv = 1;
535 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs);
536 if (getushort(b710->bpbExtFlags) & FATMIRROR)
537 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM;
538 else
539 pmp->pm_flags |= MSDOSFS_FATMIRROR;
540 } else
541 pmp->pm_flags |= MSDOSFS_FATMIRROR;
542
543 /*
544 * Check a few values (could do some more):
545 * - logical sector size: power of 2, >= block size
546 * - sectors per cluster: power of 2, >= 1
547 * - number of sectors: >= 1, <= size of partition
548 */
549 if ( (SecPerClust == 0)
550 || (SecPerClust & (SecPerClust - 1))
551 || (pmp->pm_BytesPerSec < DEV_BSIZE)
552 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1))
553 || (pmp->pm_HugeSectors == 0)
554 ) {
555 error = EINVAL;
556 goto error_exit;
557 }
558
559 pmp->pm_HugeSectors *= pmp->pm_BlkPerSec;
560 pmp->pm_HiddenSects *= pmp->pm_BlkPerSec; /* XXX not used? */
561 pmp->pm_FATsecs *= pmp->pm_BlkPerSec;
562 SecPerClust *= pmp->pm_BlkPerSec;
563
564 pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec;
565
566 if (FAT32(pmp)) {
567 pmp->pm_rootdirblk = getulong(b710->bpbRootClust);
568 pmp->pm_firstcluster = pmp->pm_fatblk
569 + (pmp->pm_FATs * pmp->pm_FATsecs);
570 pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec;
571 } else {
572 pmp->pm_rootdirblk = pmp->pm_fatblk +
573 (pmp->pm_FATs * pmp->pm_FATsecs);
574 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry)
575 + DEV_BSIZE - 1)
576 / DEV_BSIZE; /* in blocks */
577 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize;
578 }
579
580 pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) /
581 SecPerClust + 1;
582 pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE; /* XXX not used? */
583
08c23b99 584#ifndef __DragonFly__
984263bc
MD
585 if (argp->flags & MSDOSFSMNT_GEMDOSFS) {
586 if ((pmp->pm_maxcluster <= (0xff0 - 2))
587 && ((dtype == DTYPE_FLOPPY) || ((dtype == DTYPE_VNODE)
588 && ((pmp->pm_Heads == 1) || (pmp->pm_Heads == 2))))
589 ) {
590 pmp->pm_fatmask = FAT12_MASK;
591 pmp->pm_fatmult = 3;
592 pmp->pm_fatdiv = 2;
593 } else {
594 pmp->pm_fatmask = FAT16_MASK;
595 pmp->pm_fatmult = 2;
596 pmp->pm_fatdiv = 1;
597 }
598 } else
599#endif
600 if (pmp->pm_fatmask == 0) {
601 if (pmp->pm_maxcluster
602 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) {
603 /*
604 * This will usually be a floppy disk. This size makes
605 * sure that one fat entry will not be split across
606 * multiple blocks.
607 */
608 pmp->pm_fatmask = FAT12_MASK;
609 pmp->pm_fatmult = 3;
610 pmp->pm_fatdiv = 2;
611 } else {
612 pmp->pm_fatmask = FAT16_MASK;
613 pmp->pm_fatmult = 2;
614 pmp->pm_fatdiv = 1;
615 }
616 }
617
618 clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv;
619 if (pmp->pm_maxcluster >= clusters) {
620 printf("Warning: number of clusters (%ld) exceeds FAT "
621 "capacity (%ld)\n", pmp->pm_maxcluster + 1, clusters);
622 pmp->pm_maxcluster = clusters - 1;
623 }
624
625
626 if (FAT12(pmp))
627 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec;
628 else
629 pmp->pm_fatblocksize = MSDOSFS_DFLTBSIZE;
630
631 pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE;
632 pmp->pm_bnshift = ffs(DEV_BSIZE) - 1;
633
634 /*
635 * Compute mask and shift value for isolating cluster relative byte
636 * offsets and cluster numbers from a file offset.
637 */
638 pmp->pm_bpcluster = SecPerClust * DEV_BSIZE;
639 pmp->pm_crbomask = pmp->pm_bpcluster - 1;
640 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1;
641
642 /*
643 * Check for valid cluster size
644 * must be a power of 2
645 */
646 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) {
647 error = EINVAL;
648 goto error_exit;
649 }
650
651 /*
652 * Release the bootsector buffer.
653 */
654 brelse(bp);
655 bp = NULL;
656
657 /*
658 * Check FSInfo.
659 */
660 if (pmp->pm_fsinfo) {
661 struct fsinfo *fp;
662
3b568787 663 if ((error = bread(devvp, pmp->pm_fsinfo, fsi_size(pmp), &bp)) != 0)
984263bc
MD
664 goto error_exit;
665 fp = (struct fsinfo *)bp->b_data;
666 if (!bcmp(fp->fsisig1, "RRaA", 4)
667 && !bcmp(fp->fsisig2, "rrAa", 4)
668 && !bcmp(fp->fsisig3, "\0\0\125\252", 4)
50c068cf 669 && !bcmp(fp->fsisig4, "\0\0\125\252", 4)) {
984263bc 670 pmp->pm_nxtfree = getulong(fp->fsinxtfree);
50c068cf
CP
671 if (pmp->pm_nxtfree == 0xffffffff)
672 pmp->pm_nxtfree = CLUST_FIRST;
673 } else
984263bc
MD
674 pmp->pm_fsinfo = 0;
675 brelse(bp);
676 bp = NULL;
677 }
678
679 /*
680 * Check and validate (or perhaps invalidate?) the fsinfo structure?
681 */
682 if (pmp->pm_fsinfo && pmp->pm_nxtfree > pmp->pm_maxcluster) {
683 printf(
684 "Next free cluster in FSInfo (%lu) exceeds maxcluster (%lu)\n",
685 pmp->pm_nxtfree, pmp->pm_maxcluster);
686 error = EINVAL;
687 goto error_exit;
688 }
689
690 /*
691 * Allocate memory for the bitmap of allocated clusters, and then
692 * fill it in.
693 */
694 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1)
695 / N_INUSEBITS)
696 * sizeof(*pmp->pm_inusemap),
697 M_MSDOSFSFAT, M_WAITOK);
698
699 /*
700 * fillinusemap() needs pm_devvp.
701 */
702 pmp->pm_dev = dev;
703 pmp->pm_devvp = devvp;
704
705 /*
706 * Have the inuse map filled in.
707 */
708 if ((error = fillinusemap(pmp)) != 0)
709 goto error_exit;
710
711 /*
712 * If they want fat updates to be synchronous then let them suffer
713 * the performance degradation in exchange for the on disk copy of
714 * the fat being correct just about all the time. I suppose this
715 * would be a good thing to turn on if the kernel is still flakey.
716 */
717 if (mp->mnt_flag & MNT_SYNCHRONOUS)
718 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT;
719
720 /*
721 * Finish up.
722 */
723 if (ronly)
724 pmp->pm_flags |= MSDOSFSMNT_RONLY;
725 else
726 pmp->pm_fmod = 1;
727 mp->mnt_data = (qaddr_t) pmp;
728 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
729 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
730 mp->mnt_flag |= MNT_LOCAL;
0961aa92 731 vfs_add_vnodeops(&mp->mnt_vn_ops, msdosfs_vnodeop_entries);
e4c9c0c8 732 dev->si_mountpoint = mp;
984263bc
MD
733
734 return 0;
735
736error_exit:
737 if (bp)
738 brelse(bp);
3b568787 739 (void) VOP_CLOSE(devvp, ronly ? FREAD : FREAD | FWRITE, td);
984263bc
MD
740 if (pmp) {
741 if (pmp->pm_inusemap)
742 free(pmp->pm_inusemap, M_MSDOSFSFAT);
743 free(pmp, M_MSDOSFSMNT);
744 mp->mnt_data = (qaddr_t)0;
745 }
746 return (error);
747}
748
749/*
750 * Unmount the filesystem described by mp.
751 */
752static int
4625f023 753msdosfs_unmount(struct mount *mp, int mntflags, struct thread *td)
984263bc
MD
754{
755 struct msdosfsmount *pmp;
756 int error, flags;
757
758 flags = 0;
759 if (mntflags & MNT_FORCE)
760 flags |= FORCECLOSE;
761 error = vflush(mp, 0, flags);
762 if (error)
763 return error;
764 pmp = VFSTOMSDOSFS(mp);
e4c9c0c8 765 pmp->pm_devvp->v_rdev->si_mountpoint = NULL;
984263bc
MD
766#ifdef MSDOSFS_DEBUG
767 {
768 struct vnode *vp = pmp->pm_devvp;
769
770 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n");
771 printf("flag %08lx, usecount %d, writecount %d, holdcnt %ld\n",
772 vp->v_flag, vp->v_usecount, vp->v_writecount, vp->v_holdcnt);
773 printf("id %lu, mount %p, op %p\n",
774 vp->v_id, vp->v_mount, vp->v_op);
775 printf("freef %p, freeb %p, mount %p\n",
ecd80f47 776 TAILQ_NEXT(vp, v_freelist), TAILQ_PREV(vp, v_freelist),
984263bc
MD
777 vp->v_mount);
778 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %ld, type %d\n",
779 TAILQ_FIRST(&vp->v_cleanblkhd),
780 TAILQ_FIRST(&vp->v_dirtyblkhd),
781 vp->v_numoutput, vp->v_type);
782 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n",
783 vp->v_socket, vp->v_tag,
784 ((u_int *)vp->v_data)[0],
785 ((u_int *)vp->v_data)[1]);
786 }
787#endif
788 error = VOP_CLOSE(pmp->pm_devvp,
789 (pmp->pm_flags&MSDOSFSMNT_RONLY) ? FREAD : FREAD | FWRITE,
3b568787 790 td);
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MD
791 vrele(pmp->pm_devvp);
792 free(pmp->pm_inusemap, M_MSDOSFSFAT);
793 free(pmp, M_MSDOSFSMNT);
794 mp->mnt_data = (qaddr_t)0;
795 mp->mnt_flag &= ~MNT_LOCAL;
796 return (error);
797}
798
799static int
4625f023 800msdosfs_root(struct mount *mp, struct vnode **vpp)
984263bc
MD
801{
802 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
803 struct denode *ndep;
804 int error;
805
806#ifdef MSDOSFS_DEBUG
807 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp);
808#endif
809 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep);
810 if (error)
811 return (error);
812 *vpp = DETOV(ndep);
813 return (0);
814}
815
816static int
4625f023 817msdosfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td)
984263bc
MD
818{
819 struct msdosfsmount *pmp;
820
821 pmp = VFSTOMSDOSFS(mp);
822 sbp->f_bsize = pmp->pm_bpcluster;
823 sbp->f_iosize = pmp->pm_bpcluster;
824 sbp->f_blocks = pmp->pm_maxcluster + 1;
825 sbp->f_bfree = pmp->pm_freeclustercount;
826 sbp->f_bavail = pmp->pm_freeclustercount;
827 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */
828 sbp->f_ffree = 0; /* what to put in here? */
829 if (sbp != &mp->mnt_stat) {
830 sbp->f_type = mp->mnt_vfc->vfc_typenum;
831 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
832 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
833 }
834 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN);
835 return (0);
836}
837
41a01a4d
MD
838struct scaninfo {
839 int rescan;
840 int allerror;
841 int waitfor;
842 thread_t td;
843};
844
5fd012e0 845static int msdosfs_sync_scan(struct mount *mp, struct vnode *vp, void *data);
41a01a4d 846
984263bc 847static int
4625f023 848msdosfs_sync(struct mount *mp, int waitfor, struct thread *td)
984263bc 849{
984263bc 850 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
41a01a4d
MD
851 struct scaninfo scaninfo;
852 int error;
984263bc
MD
853
854 /*
855 * If we ever switch to not updating all of the fats all the time,
856 * this would be the place to update them from the first one.
857 */
858 if (pmp->pm_fmod != 0) {
859 if (pmp->pm_flags & MSDOSFSMNT_RONLY)
860 panic("msdosfs_sync: rofs mod");
861 else {
862 /* update fats here */
863 }
864 }
865 /*
866 * Write back each (modified) denode.
867 */
41a01a4d
MD
868 scaninfo.allerror = 0;
869 scaninfo.rescan = 1;
870 scaninfo.td = td;
871 while (scaninfo.rescan) {
872 scaninfo.rescan = 0;
5fd012e0 873 vmntvnodescan(mp, VMSC_GETVP|VMSC_NOWAIT, NULL, msdosfs_sync_scan, &scaninfo);
984263bc 874 }
984263bc
MD
875
876 /*
877 * Flush filesystem control info.
878 */
879 if (waitfor != MNT_LAZY) {
5fd012e0 880 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY, td);
41a01a4d
MD
881 if ((error = VOP_FSYNC(pmp->pm_devvp, waitfor, td)) != 0)
882 scaninfo.allerror = error;
5fd012e0 883 VOP_UNLOCK(pmp->pm_devvp, 0, td);
41a01a4d
MD
884 }
885 return (scaninfo.allerror);
886}
887
4625f023 888static int
5fd012e0 889msdosfs_sync_scan(struct mount *mp, struct vnode *vp, void *data)
41a01a4d
MD
890{
891 struct scaninfo *info = data;
892 struct denode *dep;
893 int error;
894
895 dep = VTODE(vp);
896 if (vp->v_type == VNON ||
897 ((dep->de_flag &
898 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 &&
899 (TAILQ_EMPTY(&vp->v_dirtyblkhd) || info->waitfor == MNT_LAZY))) {
41a01a4d 900 return(0);
984263bc 901 }
41a01a4d
MD
902 if ((error = VOP_FSYNC(vp, info->waitfor, info->td)) != 0)
903 info->allerror = error;
41a01a4d 904 return(0);
984263bc
MD
905}
906
907static int
4625f023 908msdosfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp)
984263bc
MD
909{
910 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
911 struct defid *defhp = (struct defid *) fhp;
912 struct denode *dep;
913 int error;
914
915 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep);
916 if (error) {
917 *vpp = NULLVP;
918 return (error);
919 }
920 *vpp = DETOV(dep);
921 return (0);
922}
923
924static int
4625f023
CP
925msdosfs_checkexp(struct mount *mp, struct sockaddr *nam, int *exflagsp,
926 struct ucred **credanonp)
984263bc
MD
927{
928 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
929 struct netcred *np;
930
931 np = vfs_export_lookup(mp, &pmp->pm_export, nam);
932 if (np == NULL)
933 return (EACCES);
934 *exflagsp = np->netc_exflags;
935 *credanonp = &np->netc_anon;
936 return (0);
937}
938
939static int
4625f023 940msdosfs_vptofh(struct vnode *vp, struct fid *fhp)
984263bc
MD
941{
942 struct denode *dep;
943 struct defid *defhp;
944
945 dep = VTODE(vp);
946 defhp = (struct defid *)fhp;
947 defhp->defid_len = sizeof(struct defid);
948 defhp->defid_dirclust = dep->de_dirclust;
949 defhp->defid_dirofs = dep->de_diroffset;
950 /* defhp->defid_gen = dep->de_gen; */
951 return (0);
952}
953
954static struct vfsops msdosfs_vfsops = {
955 msdosfs_mount,
956 vfs_stdstart,
957 msdosfs_unmount,
958 msdosfs_root,
959 vfs_stdquotactl,
960 msdosfs_statfs,
961 msdosfs_sync,
962 vfs_stdvget,
963 msdosfs_fhtovp,
964 msdosfs_checkexp,
965 msdosfs_vptofh,
966 msdosfs_init,
967 msdosfs_uninit,
968 vfs_stdextattrctl,
969};
970
971VFS_SET(msdosfs_vfsops, msdos, 0);