1 /* $NetBSD: msdosfs_vfsops.c,v 1.51 1997/11/17 15:36:58 ws Exp $ */
2
3 /*-
4 * SPDX-License-Identifier: BSD-4-Clause
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/buf.h>
55 #include <sys/bufobj.h>
56 #include <sys/conf.h>
57 #include <sys/fcntl.h>
58 #include <sys/iconv.h>
59 #include <sys/kernel.h>
60 #include <sys/lock.h>
61 #include <sys/malloc.h>
62 #include <sys/mount.h>
63 #include <sys/mutex.h>
64 #include <sys/namei.h>
65 #include <sys/priv.h>
66 #include <sys/proc.h>
67 #include <sys/rwlock.h>
68 #include <sys/stat.h>
69 #include <sys/taskqueue.h>
70 #include <sys/vnode.h>
71
72 #include <geom/geom.h>
73 #include <geom/geom_vfs.h>
74
75 #include <fs/msdosfs/bootsect.h>
76 #include <fs/msdosfs/bpb.h>
77 #include <fs/msdosfs/direntry.h>
78 #include <fs/msdosfs/denode.h>
79 #include <fs/msdosfs/fat.h>
80 #include <fs/msdosfs/msdosfsmount.h>
81
82 #ifdef MSDOSFS_DEBUG
83 #include <sys/rwlock.h>
84 #endif
85
86 static const char msdosfs_lock_msg[] = "fatlk";
87
88 /* Mount options that we support. */
89 static const char *msdosfs_opts[] = {
90 "async", "noatime", "noclusterr", "noclusterw",
91 "export", "force", "from", "sync",
92 "cs_dos", "cs_local", "cs_win", "dirmask",
93 "gid", "kiconv", "longname",
94 "longnames", "mask", "shortname", "shortnames",
95 "uid", "win95", "nowin95",
96 NULL
97 };
98
99 #if 1 /*def PC98*/
100 /*
101 * XXX - The boot signature formatted by NEC PC-98 DOS looks like a
102 * garbage or a random value :-{
103 * If you want to use that broken-signatured media, define the
104 * following symbol even though PC/AT.
105 * (ex. mount PC-98 DOS formatted FD on PC/AT)
106 */
107 #define MSDOSFS_NOCHECKSIG
108 #endif
109
110 MALLOC_DEFINE(M_MSDOSFSMNT, "msdosfs_mount", "MSDOSFS mount structure");
111 static MALLOC_DEFINE(M_MSDOSFSFAT, "msdosfs_fat", "MSDOSFS file allocation table");
112
113 struct iconv_functions *msdosfs_iconv;
114
115 static int update_mp(struct mount *mp, struct thread *td);
116 static int mountmsdosfs(struct vnode *devvp, struct mount *mp);
117 static void msdosfs_remount_ro(void *arg, int pending);
118 static vfs_fhtovp_t msdosfs_fhtovp;
119 static vfs_mount_t msdosfs_mount;
120 static vfs_root_t msdosfs_root;
121 static vfs_statfs_t msdosfs_statfs;
122 static vfs_sync_t msdosfs_sync;
123 static vfs_unmount_t msdosfs_unmount;
124
125 /* Maximum length of a character set name (arbitrary). */
126 #define MAXCSLEN 64
127
128 static int
update_mp(struct mount * mp,struct thread * td)129 update_mp(struct mount *mp, struct thread *td)
130 {
131 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
132 void *dos, *win, *local;
133 int error, v;
134
135 if (!vfs_getopt(mp->mnt_optnew, "kiconv", NULL, NULL)) {
136 if (msdosfs_iconv != NULL) {
137 error = vfs_getopt(mp->mnt_optnew,
138 "cs_win", &win, NULL);
139 if (!error)
140 error = vfs_getopt(mp->mnt_optnew,
141 "cs_local", &local, NULL);
142 if (!error)
143 error = vfs_getopt(mp->mnt_optnew,
144 "cs_dos", &dos, NULL);
145 if (!error) {
146 msdosfs_iconv->open(win, local, &pmp->pm_u2w);
147 msdosfs_iconv->open(local, win, &pmp->pm_w2u);
148 msdosfs_iconv->open(dos, local, &pmp->pm_u2d);
149 msdosfs_iconv->open(local, dos, &pmp->pm_d2u);
150 }
151 if (error != 0)
152 return (error);
153 } else {
154 pmp->pm_w2u = NULL;
155 pmp->pm_u2w = NULL;
156 pmp->pm_d2u = NULL;
157 pmp->pm_u2d = NULL;
158 }
159 }
160
161 if (vfs_scanopt(mp->mnt_optnew, "gid", "%d", &v) == 1)
162 pmp->pm_gid = v;
163 if (vfs_scanopt(mp->mnt_optnew, "uid", "%d", &v) == 1)
164 pmp->pm_uid = v;
165 if (vfs_scanopt(mp->mnt_optnew, "mask", "%d", &v) == 1)
166 pmp->pm_mask = v & ALLPERMS;
167 if (vfs_scanopt(mp->mnt_optnew, "dirmask", "%d", &v) == 1)
168 pmp->pm_dirmask = v & ALLPERMS;
169 vfs_flagopt(mp->mnt_optnew, "shortname",
170 &pmp->pm_flags, MSDOSFSMNT_SHORTNAME);
171 vfs_flagopt(mp->mnt_optnew, "shortnames",
172 &pmp->pm_flags, MSDOSFSMNT_SHORTNAME);
173 vfs_flagopt(mp->mnt_optnew, "longname",
174 &pmp->pm_flags, MSDOSFSMNT_LONGNAME);
175 vfs_flagopt(mp->mnt_optnew, "longnames",
176 &pmp->pm_flags, MSDOSFSMNT_LONGNAME);
177 vfs_flagopt(mp->mnt_optnew, "kiconv",
178 &pmp->pm_flags, MSDOSFSMNT_KICONV);
179
180 if (vfs_getopt(mp->mnt_optnew, "nowin95", NULL, NULL) == 0)
181 pmp->pm_flags |= MSDOSFSMNT_NOWIN95;
182 else
183 pmp->pm_flags &= ~MSDOSFSMNT_NOWIN95;
184
185 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95)
186 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME;
187 else
188 pmp->pm_flags |= MSDOSFSMNT_LONGNAME;
189 return 0;
190 }
191
192 static int
msdosfs_cmount(struct mntarg * ma,void * data,uint64_t flags)193 msdosfs_cmount(struct mntarg *ma, void *data, uint64_t flags)
194 {
195 struct msdosfs_args args;
196 int error;
197
198 if (data == NULL)
199 return (EINVAL);
200 error = copyin(data, &args, sizeof args);
201 if (error)
202 return (error);
203
204 ma = mount_argsu(ma, "from", args.fspec, MAXPATHLEN);
205 ma = mount_arg(ma, "export", &args.export, sizeof(args.export));
206 ma = mount_argf(ma, "uid", "%d", args.uid);
207 ma = mount_argf(ma, "gid", "%d", args.gid);
208 ma = mount_argf(ma, "mask", "%d", args.mask);
209 ma = mount_argf(ma, "dirmask", "%d", args.dirmask);
210
211 ma = mount_argb(ma, args.flags & MSDOSFSMNT_SHORTNAME, "noshortname");
212 ma = mount_argb(ma, args.flags & MSDOSFSMNT_LONGNAME, "nolongname");
213 ma = mount_argb(ma, !(args.flags & MSDOSFSMNT_NOWIN95), "nowin95");
214 ma = mount_argb(ma, args.flags & MSDOSFSMNT_KICONV, "nokiconv");
215
216 ma = mount_argsu(ma, "cs_win", args.cs_win, MAXCSLEN);
217 ma = mount_argsu(ma, "cs_dos", args.cs_dos, MAXCSLEN);
218 ma = mount_argsu(ma, "cs_local", args.cs_local, MAXCSLEN);
219
220 error = kernel_mount(ma, flags);
221
222 return (error);
223 }
224
225 /*
226 * mp - path - addr in user space of mount point (ie /usr or whatever)
227 * data - addr in user space of mount params including the name of the block
228 * special file to treat as a filesystem.
229 */
230 static int
msdosfs_mount(struct mount * mp)231 msdosfs_mount(struct mount *mp)
232 {
233 struct vnode *devvp, *odevvp; /* vnode for blk device to mount */
234 struct thread *td;
235 /* msdosfs specific mount control block */
236 struct msdosfsmount *pmp = NULL;
237 struct nameidata ndp;
238 int error, flags;
239 accmode_t accmode;
240 char *from;
241
242 td = curthread;
243 if (vfs_filteropt(mp->mnt_optnew, msdosfs_opts))
244 return (EINVAL);
245
246 /*
247 * If updating, check whether changing from read-only to
248 * read/write; if there is no device name, that's all we do.
249 */
250 if (mp->mnt_flag & MNT_UPDATE) {
251 pmp = VFSTOMSDOSFS(mp);
252 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) &&
253 vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0)) {
254 if ((error = vn_start_write(NULL, &mp, V_WAIT)) != 0)
255 return (error);
256 error = vfs_write_suspend_umnt(mp);
257 if (error != 0)
258 return (error);
259
260 flags = WRITECLOSE;
261 if (mp->mnt_flag & MNT_FORCE)
262 flags |= FORCECLOSE;
263 error = vflush(mp, 0, flags, td);
264 if (error != 0) {
265 vfs_write_resume(mp, 0);
266 return (error);
267 }
268
269 /*
270 * Now the volume is clean. Mark it so while the
271 * device is still rw.
272 */
273 error = markvoldirty(pmp, 0);
274 if (error != 0) {
275 vfs_write_resume(mp, 0);
276 (void)markvoldirty(pmp, 1);
277 return (error);
278 }
279
280 /* Downgrade the device from rw to ro. */
281 g_topology_lock();
282 error = g_access(pmp->pm_cp, 0, -1, 0);
283 g_topology_unlock();
284 if (error) {
285 vfs_write_resume(mp, 0);
286 (void)markvoldirty(pmp, 1);
287 return (error);
288 }
289
290 /*
291 * Backing out after an error was painful in the
292 * above. Now we are committed to succeeding.
293 */
294 pmp->pm_fmod = 0;
295 pmp->pm_flags |= MSDOSFSMNT_RONLY;
296 MNT_ILOCK(mp);
297 mp->mnt_flag |= MNT_RDONLY;
298 MNT_IUNLOCK(mp);
299 vfs_write_resume(mp, 0);
300 } else if ((pmp->pm_flags & MSDOSFSMNT_RONLY) &&
301 !vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0)) {
302 /*
303 * If upgrade to read-write by non-root, then verify
304 * that user has necessary permissions on the device.
305 */
306 odevvp = pmp->pm_odevvp;
307 vn_lock(odevvp, LK_EXCLUSIVE | LK_RETRY);
308 error = VOP_ACCESS(odevvp, VREAD | VWRITE,
309 td->td_ucred, td);
310 if (error)
311 error = priv_check(td, PRIV_VFS_MOUNT_PERM);
312 if (error) {
313 VOP_UNLOCK(odevvp);
314 return (error);
315 }
316 VOP_UNLOCK(odevvp);
317 g_topology_lock();
318 error = g_access(pmp->pm_cp, 0, 1, 0);
319 g_topology_unlock();
320 if (error)
321 return (error);
322
323 /* Now that the volume is modifiable, mark it dirty. */
324 error = markvoldirty_upgrade(pmp, true, true);
325 if (error) {
326 /*
327 * If dirtying the superblock failed, drop GEOM
328 * 'w' refs (we're still RO).
329 */
330 g_topology_lock();
331 (void)g_access(pmp->pm_cp, 0, -1, 0);
332 g_topology_unlock();
333
334 return (error);
335 }
336
337 pmp->pm_fmod = 1;
338 pmp->pm_flags &= ~MSDOSFSMNT_RONLY;
339 MNT_ILOCK(mp);
340 mp->mnt_flag &= ~MNT_RDONLY;
341 MNT_IUNLOCK(mp);
342 }
343
344 /*
345 * Avoid namei() below. The "from" option is not set.
346 * Update of the devvp is pointless for this case.
347 */
348 if ((pmp->pm_flags & MSDOSFS_ERR_RO) != 0)
349 return (0);
350 }
351 /*
352 * Not an update, or updating the name: look up the name
353 * and verify that it refers to a sensible disk device.
354 */
355 if (vfs_getopt(mp->mnt_optnew, "from", (void **)&from, NULL))
356 return (EINVAL);
357 NDINIT(&ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, from);
358 error = namei(&ndp);
359 if (error)
360 return (error);
361 devvp = ndp.ni_vp;
362 NDFREE_PNBUF(&ndp);
363
364 if (!vn_isdisk_error(devvp, &error)) {
365 vput(devvp);
366 return (error);
367 }
368 /*
369 * If mount by non-root, then verify that user has necessary
370 * permissions on the device.
371 */
372 accmode = VREAD;
373 if ((mp->mnt_flag & MNT_RDONLY) == 0)
374 accmode |= VWRITE;
375 error = VOP_ACCESS(devvp, accmode, td->td_ucred, td);
376 if (error)
377 error = priv_check(td, PRIV_VFS_MOUNT_PERM);
378 if (error) {
379 vput(devvp);
380 return (error);
381 }
382 if ((mp->mnt_flag & MNT_UPDATE) == 0) {
383 error = mountmsdosfs(devvp, mp);
384 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */
385 pmp = VFSTOMSDOSFS(mp);
386 #endif
387 } else {
388 vput(devvp);
389 if (devvp != pmp->pm_odevvp)
390 return (EINVAL); /* XXX needs translation */
391 }
392 if (error) {
393 vrele(devvp);
394 return (error);
395 }
396
397 error = update_mp(mp, td);
398 if (error) {
399 if ((mp->mnt_flag & MNT_UPDATE) == 0)
400 msdosfs_unmount(mp, MNT_FORCE);
401 return error;
402 }
403
404 vfs_mountedfrom(mp, from);
405 #ifdef MSDOSFS_DEBUG
406 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap);
407 #endif
408 return (0);
409 }
410
411 /*
412 * The FAT12 and FAT16 file systems use a limited size root directory that
413 * can be created with 1 to 65535 entries for files, directories, or a disk
414 * label (but DOS or Windows creates at most 512 root directory entries).
415 * This function calculates the number of free root directory entries by
416 * counting the non-deleted entries (not starting with 0xE5) and by adding
417 * the amount of never used entries (with the position indicated by an
418 * entry that starts with 0x00).
419 */
420 static int
rootdir_free(struct msdosfsmount * pmp)421 rootdir_free(struct msdosfsmount* pmp)
422 {
423 struct buf *bp;
424 struct direntry *dep;
425 u_long readsize;
426 int dirclu;
427 int diridx;
428 int dirmax;
429 int dirleft;
430 int ffree;
431
432 dirclu = pmp->pm_rootdirblk;
433
434 /*
435 * The msdosfs code ignores pm_RootDirEnts and uses pm_rootdirsize
436 * (measured in DEV_BSIZE) to prevent excess root dir allocations.
437 */
438 dirleft = howmany(pmp->pm_rootdirsize * DEV_BSIZE,
439 sizeof(struct direntry));
440
441 /* Read in chunks of default maximum root directory size */
442 readsize = 512 * sizeof(struct direntry);
443
444 #ifdef MSDOSFS_DEBUG
445 printf("rootdir_free: blkpersec=%lu fatblksize=%lu dirsize=%lu "
446 "firstclu=%lu dirclu=%d entries=%d rootdirsize=%lu "
447 "bytespersector=%hu bytepercluster=%lu\n",
448 pmp->pm_BlkPerSec, pmp->pm_fatblocksize, readsize,
449 pmp->pm_firstcluster, dirclu, dirleft, pmp->pm_rootdirsize,
450 pmp->pm_BytesPerSec, pmp->pm_bpcluster);
451 #endif
452 ffree = dirleft;
453 while (dirleft > 0 && ffree > 0) {
454 if (readsize > dirleft * sizeof(struct direntry))
455 readsize = dirleft * sizeof(struct direntry);
456 #ifdef MSDOSFS_DEBUG
457 printf("rootdir_free: dirclu=%d dirleft=%d readsize=%lu\n",
458 dirclu, dirleft, readsize);
459 #endif
460 if (bread(pmp->pm_devvp, dirclu, readsize, NOCRED, &bp) != 0) {
461 printf("rootdir_free: read error\n");
462 if (bp != NULL)
463 brelse(bp);
464 return (-1);
465 }
466 dirmax = readsize / sizeof(struct direntry);
467 for (diridx = 0; diridx < dirmax && dirleft > 0;
468 diridx++, dirleft--) {
469 dep = (struct direntry*)bp->b_data + diridx;
470 #ifdef MSDOSFS_DEBUG
471 if (dep->deName[0] == SLOT_DELETED)
472 printf("rootdir_free: idx=%d <deleted>\n",
473 diridx);
474 else if (dep->deName[0] == SLOT_EMPTY)
475 printf("rootdir_free: idx=%d <end marker>\n",
476 diridx);
477 else if (dep->deAttributes == ATTR_WIN95)
478 printf("rootdir_free: idx=%d <LFN part %d>\n",
479 diridx, (dep->deName[0] & 0x1f) + 1);
480 else if (dep->deAttributes & ATTR_VOLUME)
481 printf("rootdir_free: idx=%d label='%11.11s'\n",
482 diridx, dep->deName);
483 else if (dep->deAttributes & ATTR_DIRECTORY)
484 printf("rootdir_free: idx=%d dir='%11.11s'\n",
485 diridx, dep->deName);
486 else
487 printf("rootdir_free: idx=%d file='%11.11s'\n",
488 diridx, dep->deName);
489 #endif
490 if (dep->deName[0] == SLOT_EMPTY)
491 dirleft = 0;
492 else if (dep->deName[0] != SLOT_DELETED)
493 ffree--;
494 }
495 brelse(bp);
496 bp = NULL;
497 dirclu += readsize / DEV_BSIZE;
498 }
499 return (ffree);
500 }
501
502 static int
mountmsdosfs(struct vnode * odevvp,struct mount * mp)503 mountmsdosfs(struct vnode *odevvp, struct mount *mp)
504 {
505 struct msdosfsmount *pmp;
506 struct buf *bp;
507 struct cdev *dev;
508 struct vnode *devvp;
509 union bootsector *bsp;
510 struct byte_bpb33 *b33;
511 struct byte_bpb50 *b50;
512 struct byte_bpb710 *b710;
513 uint8_t SecPerClust;
514 u_long clusters;
515 int ronly, error;
516 struct g_consumer *cp;
517 struct bufobj *bo;
518
519 bp = NULL; /* This and pmp both used in error_exit. */
520 pmp = NULL;
521 ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
522
523 devvp = mntfs_allocvp(mp, odevvp);
524 dev = devvp->v_rdev;
525 if (atomic_cmpset_acq_ptr((uintptr_t *)&dev->si_mountpt, 0,
526 (uintptr_t)mp) == 0) {
527 mntfs_freevp(devvp);
528 return (EBUSY);
529 }
530 g_topology_lock();
531 error = g_vfs_open(devvp, &cp, "msdosfs", ronly ? 0 : 1);
532 g_topology_unlock();
533 if (error != 0) {
534 atomic_store_rel_ptr((uintptr_t *)&dev->si_mountpt, 0);
535 mntfs_freevp(devvp);
536 return (error);
537 }
538 dev_ref(dev);
539 bo = &devvp->v_bufobj;
540 BO_LOCK(&odevvp->v_bufobj);
541 odevvp->v_bufobj.bo_flag |= BO_NOBUFS;
542 BO_UNLOCK(&odevvp->v_bufobj);
543 VOP_UNLOCK(devvp);
544 if (dev->si_iosize_max != 0)
545 mp->mnt_iosize_max = dev->si_iosize_max;
546 if (mp->mnt_iosize_max > maxphys)
547 mp->mnt_iosize_max = maxphys;
548
549 /*
550 * Read the boot sector of the filesystem, and then check the
551 * boot signature. If not a dos boot sector then error out.
552 *
553 * NOTE: 8192 is a magic size that works for ffs.
554 */
555 error = bread(devvp, 0, 8192, NOCRED, &bp);
556 if (error)
557 goto error_exit;
558 bp->b_flags |= B_AGE;
559 bsp = (union bootsector *)bp->b_data;
560 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB;
561 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB;
562 b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB;
563
564 #ifndef MSDOSFS_NOCHECKSIG
565 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 ||
566 bsp->bs50.bsBootSectSig1 != BOOTSIG1) {
567 error = EINVAL;
568 goto error_exit;
569 }
570 #endif
571
572 pmp = malloc(sizeof(*pmp), M_MSDOSFSMNT, M_WAITOK | M_ZERO);
573 pmp->pm_mountp = mp;
574 pmp->pm_cp = cp;
575 pmp->pm_bo = bo;
576
577 lockinit(&pmp->pm_fatlock, 0, msdosfs_lock_msg, 0, 0);
578 lockinit(&pmp->pm_checkpath_lock, 0, "msdoscp", 0, 0);
579
580 TASK_INIT(&pmp->pm_rw2ro_task, 0, msdosfs_remount_ro, pmp);
581
582 /*
583 * Initialize ownerships and permissions, since nothing else will
584 * initialize them iff we are mounting root.
585 */
586 pmp->pm_uid = UID_ROOT;
587 pmp->pm_gid = GID_WHEEL;
588 pmp->pm_mask = pmp->pm_dirmask = S_IXUSR | S_IXGRP | S_IXOTH |
589 S_IRUSR | S_IRGRP | S_IROTH | S_IWUSR;
590
591 /*
592 * Compute several useful quantities from the bpb in the
593 * bootsector. Copy in the dos 5 variant of the bpb then fix up
594 * the fields that are different between dos 5 and dos 3.3.
595 */
596 SecPerClust = b50->bpbSecPerClust;
597 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec);
598 if (pmp->pm_BytesPerSec < DEV_BSIZE) {
599 error = EINVAL;
600 goto error_exit;
601 }
602 pmp->pm_ResSectors = getushort(b50->bpbResSectors);
603 pmp->pm_FATs = b50->bpbFATs;
604 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts);
605 pmp->pm_Sectors = getushort(b50->bpbSectors);
606 pmp->pm_FATsecs = getushort(b50->bpbFATsecs);
607 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack);
608 pmp->pm_Heads = getushort(b50->bpbHeads);
609 pmp->pm_Media = b50->bpbMedia;
610
611 /* calculate the ratio of sector size to DEV_BSIZE */
612 pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE;
613
614 /*
615 * We don't check pm_Heads nor pm_SecPerTrack, because
616 * these may not be set for EFI file systems. We don't
617 * use these anyway, so we're unaffected if they are
618 * invalid.
619 */
620 if (pmp->pm_BytesPerSec == 0 || SecPerClust == 0) {
621 error = EINVAL;
622 goto error_exit;
623 }
624
625 if (pmp->pm_Sectors == 0) {
626 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs);
627 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors);
628 } else {
629 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs);
630 pmp->pm_HugeSectors = pmp->pm_Sectors;
631 }
632
633 if (pmp->pm_RootDirEnts == 0) {
634 if (pmp->pm_FATsecs != 0 || getushort(b710->bpbFSVers) != 0) {
635 error = EINVAL;
636 #ifdef MSDOSFS_DEBUG
637 printf("mountmsdosfs(): bad FAT32 filesystem\n");
638 #endif
639 goto error_exit;
640 }
641 pmp->pm_fatmask = FAT32_MASK;
642 pmp->pm_fatmult = 4;
643 pmp->pm_fatdiv = 1;
644 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs);
645 if ((getushort(b710->bpbExtFlags) & FATMIRROR) != 0)
646 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM;
647 else
648 pmp->pm_flags |= MSDOSFS_FATMIRROR;
649 } else
650 pmp->pm_flags |= MSDOSFS_FATMIRROR;
651
652 /*
653 * Check a few values (could do some more):
654 * - logical sector size: power of 2, >= block size
655 * - sectors per cluster: power of 2, >= 1
656 * - number of sectors: >= 1, <= size of partition
657 * - number of FAT sectors: >= 1
658 */
659 if (SecPerClust == 0 || (SecPerClust & (SecPerClust - 1)) != 0 ||
660 pmp->pm_BytesPerSec < DEV_BSIZE ||
661 (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) != 0 ||
662 pmp->pm_HugeSectors == 0 || pmp->pm_FATsecs == 0 ||
663 SecPerClust * pmp->pm_BlkPerSec > MAXBSIZE / DEV_BSIZE) {
664 error = EINVAL;
665 goto error_exit;
666 }
667
668 if ((off_t)pmp->pm_HugeSectors * pmp->pm_BytesPerSec <
669 pmp->pm_HugeSectors /* overflow */ ||
670 (off_t)pmp->pm_HugeSectors * pmp->pm_BytesPerSec >
671 cp->provider->mediasize /* past end of vol */) {
672 error = EINVAL;
673 goto error_exit;
674 }
675
676 pmp->pm_HugeSectors *= pmp->pm_BlkPerSec;
677 pmp->pm_HiddenSects *= pmp->pm_BlkPerSec; /* XXX not used? */
678 pmp->pm_FATsecs *= pmp->pm_BlkPerSec;
679 SecPerClust *= pmp->pm_BlkPerSec;
680
681 pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec;
682
683 if (FAT32(pmp)) {
684 pmp->pm_rootdirblk = getulong(b710->bpbRootClust);
685 pmp->pm_firstcluster = pmp->pm_fatblk +
686 pmp->pm_FATs * pmp->pm_FATsecs;
687 pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec;
688 } else {
689 pmp->pm_rootdirblk = pmp->pm_fatblk +
690 pmp->pm_FATs * pmp->pm_FATsecs;
691 pmp->pm_rootdirsize = howmany(pmp->pm_RootDirEnts *
692 sizeof(struct direntry), DEV_BSIZE); /* in blocks */
693 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize;
694 }
695
696 if (pmp->pm_HugeSectors <= pmp->pm_firstcluster) {
697 error = EINVAL;
698 goto error_exit;
699 }
700 pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) /
701 SecPerClust + 1;
702 pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE;
703
704 if (pmp->pm_fatmask == 0) {
705 /*
706 * The last 10 (or 16?) clusters are reserved and must not
707 * be allocated for data.
708 */
709 if (pmp->pm_maxcluster < (CLUST_RSRVD & FAT12_MASK)) {
710 /*
711 * This will usually be a floppy disk. This size makes
712 * sure that one FAT entry will not be split across
713 * multiple blocks.
714 */
715 pmp->pm_fatmask = FAT12_MASK;
716 pmp->pm_fatmult = 3;
717 pmp->pm_fatdiv = 2;
718 } else {
719 pmp->pm_fatmask = FAT16_MASK;
720 pmp->pm_fatmult = 2;
721 pmp->pm_fatdiv = 1;
722 }
723 }
724
725 clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv ;
726 if (pmp->pm_maxcluster >= clusters) {
727 #ifdef MSDOSFS_DEBUG
728 printf("Warning: number of clusters (%ld) exceeds FAT "
729 "capacity (%ld)\n", pmp->pm_maxcluster - 1, clusters);
730 #endif
731 pmp->pm_maxcluster = clusters - 1;
732 }
733
734 if (FAT12(pmp))
735 pmp->pm_fatblocksize = 3 * 512;
736 else
737 pmp->pm_fatblocksize = PAGE_SIZE;
738 pmp->pm_fatblocksize = roundup(pmp->pm_fatblocksize,
739 pmp->pm_BytesPerSec);
740 pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE;
741 pmp->pm_bnshift = ffs(DEV_BSIZE) - 1;
742
743 /*
744 * Compute mask and shift value for isolating cluster relative byte
745 * offsets and cluster numbers from a file offset.
746 */
747 pmp->pm_bpcluster = SecPerClust * DEV_BSIZE;
748 pmp->pm_crbomask = pmp->pm_bpcluster - 1;
749 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1;
750
751 /*
752 * Check for valid cluster size
753 * must be a power of 2
754 */
755 if ((pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) != 0) {
756 error = EINVAL;
757 goto error_exit;
758 }
759
760 /*
761 * Release the bootsector buffer.
762 */
763 brelse(bp);
764 bp = NULL;
765
766 /*
767 * Check the fsinfo sector if we have one. Silently fix up our
768 * in-core copy of fp->fsinxtfree if it is unknown (0xffffffff)
769 * or too large. Ignore fp->fsinfree for now, since we need to
770 * read the entire FAT anyway to fill the inuse map.
771 */
772 if (pmp->pm_fsinfo) {
773 struct fsinfo *fp;
774
775 if ((error = bread(devvp, pmp->pm_fsinfo, pmp->pm_BytesPerSec,
776 NOCRED, &bp)) != 0)
777 goto error_exit;
778 fp = (struct fsinfo *)bp->b_data;
779 if (!bcmp(fp->fsisig1, "RRaA", 4) &&
780 !bcmp(fp->fsisig2, "rrAa", 4) &&
781 !bcmp(fp->fsisig3, "\0\0\125\252", 4)) {
782 pmp->pm_nxtfree = getulong(fp->fsinxtfree);
783 if (pmp->pm_nxtfree > pmp->pm_maxcluster)
784 pmp->pm_nxtfree = CLUST_FIRST;
785 } else
786 pmp->pm_fsinfo = 0;
787 brelse(bp);
788 bp = NULL;
789 }
790
791 /*
792 * Finish initializing pmp->pm_nxtfree (just in case the first few
793 * sectors aren't properly reserved in the FAT). This completes
794 * the fixup for fp->fsinxtfree, and fixes up the zero-initialized
795 * value if there is no fsinfo. We will use pmp->pm_nxtfree
796 * internally even if there is no fsinfo.
797 */
798 if (pmp->pm_nxtfree < CLUST_FIRST)
799 pmp->pm_nxtfree = CLUST_FIRST;
800
801 /*
802 * Allocate memory for the bitmap of allocated clusters, and then
803 * fill it in.
804 */
805 pmp->pm_inusemap = malloc(howmany(pmp->pm_maxcluster + 1,
806 N_INUSEBITS) * sizeof(*pmp->pm_inusemap), M_MSDOSFSFAT, M_WAITOK);
807
808 /*
809 * fillinusemap() needs pm_devvp.
810 */
811 pmp->pm_devvp = devvp;
812 pmp->pm_odevvp = odevvp;
813 pmp->pm_dev = dev;
814
815 /*
816 * Have the inuse map filled in.
817 */
818 MSDOSFS_LOCK_MP(pmp);
819 error = fillinusemap(pmp);
820 MSDOSFS_UNLOCK_MP(pmp);
821 if (error != 0)
822 goto error_exit;
823
824 /*
825 * If they want FAT updates to be synchronous then let them suffer
826 * the performance degradation in exchange for the on disk copy of
827 * the FAT being correct just about all the time. I suppose this
828 * would be a good thing to turn on if the kernel is still flakey.
829 */
830 if (mp->mnt_flag & MNT_SYNCHRONOUS)
831 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT;
832
833 /*
834 * Finish up.
835 */
836 if (ronly)
837 pmp->pm_flags |= MSDOSFSMNT_RONLY;
838 else {
839 if ((error = markvoldirty(pmp, 1)) != 0)
840 goto error_exit;
841 pmp->pm_fmod = 1;
842 }
843
844 if (FAT32(pmp)) {
845 pmp->pm_rootdirfree = 0;
846 } else {
847 pmp->pm_rootdirfree = rootdir_free(pmp);
848 if (pmp->pm_rootdirfree < 0)
849 goto error_exit;
850 }
851
852 mp->mnt_data = pmp;
853 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
854 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
855 MNT_ILOCK(mp);
856 mp->mnt_flag |= MNT_LOCAL;
857 mp->mnt_kern_flag |= MNTK_USES_BCACHE | MNTK_NO_IOPF;
858 MNT_IUNLOCK(mp);
859
860 return (0);
861
862 error_exit:
863 if (bp != NULL)
864 brelse(bp);
865 if (cp != NULL) {
866 g_topology_lock();
867 g_vfs_close(cp);
868 g_topology_unlock();
869 }
870 if (pmp != NULL) {
871 lockdestroy(&pmp->pm_fatlock);
872 lockdestroy(&pmp->pm_checkpath_lock);
873 free(pmp->pm_inusemap, M_MSDOSFSFAT);
874 free(pmp, M_MSDOSFSMNT);
875 mp->mnt_data = NULL;
876 }
877 BO_LOCK(&odevvp->v_bufobj);
878 odevvp->v_bufobj.bo_flag &= ~BO_NOBUFS;
879 BO_UNLOCK(&odevvp->v_bufobj);
880 atomic_store_rel_ptr((uintptr_t *)&dev->si_mountpt, 0);
881 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
882 mntfs_freevp(devvp);
883 dev_rel(dev);
884 return (error);
885 }
886
887 /*
888 * Unmount the filesystem described by mp.
889 */
890 static int
msdosfs_unmount(struct mount * mp,int mntflags)891 msdosfs_unmount(struct mount *mp, int mntflags)
892 {
893 struct msdosfsmount *pmp;
894 int error, flags;
895 bool susp;
896
897 error = flags = 0;
898 pmp = VFSTOMSDOSFS(mp);
899 susp = (pmp->pm_flags & MSDOSFSMNT_RONLY) == 0;
900
901 if (susp) {
902 error = vfs_write_suspend_umnt(mp);
903 if (error != 0)
904 return (error);
905 }
906
907 if ((mntflags & MNT_FORCE) != 0)
908 flags |= FORCECLOSE;
909 error = vflush(mp, 0, flags, curthread);
910 if (error != 0 && error != ENXIO) {
911 if (susp)
912 vfs_write_resume(mp, VR_START_WRITE);
913 return (error);
914 }
915 if (susp) {
916 error = markvoldirty(pmp, 0);
917 if (error != 0 && error != ENXIO) {
918 if (susp)
919 vfs_write_resume(mp, VR_START_WRITE);
920 (void)markvoldirty(pmp, 1);
921 return (error);
922 }
923 }
924 if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) {
925 if (pmp->pm_w2u)
926 msdosfs_iconv->close(pmp->pm_w2u);
927 if (pmp->pm_u2w)
928 msdosfs_iconv->close(pmp->pm_u2w);
929 if (pmp->pm_d2u)
930 msdosfs_iconv->close(pmp->pm_d2u);
931 if (pmp->pm_u2d)
932 msdosfs_iconv->close(pmp->pm_u2d);
933 }
934
935 #ifdef MSDOSFS_DEBUG
936 {
937 struct vnode *vp = pmp->pm_devvp;
938 struct bufobj *bo;
939
940 bo = &vp->v_bufobj;
941 BO_LOCK(bo);
942 VI_LOCK(vp);
943 vn_printf(vp,
944 "msdosfs_umount(): just before calling VOP_CLOSE()\n");
945 printf("freef %p, freeb %p, mount %p\n",
946 TAILQ_NEXT(vp, v_vnodelist), vp->v_vnodelist.tqe_prev,
947 vp->v_mount);
948 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n",
949 TAILQ_FIRST(&vp->v_bufobj.bo_clean.bv_hd),
950 TAILQ_FIRST(&vp->v_bufobj.bo_dirty.bv_hd),
951 vp->v_bufobj.bo_numoutput, vp->v_type);
952 VI_UNLOCK(vp);
953 BO_UNLOCK(bo);
954 }
955 #endif
956 if (susp)
957 vfs_write_resume(mp, VR_START_WRITE);
958
959 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY);
960 g_topology_lock();
961 g_vfs_close(pmp->pm_cp);
962 g_topology_unlock();
963 BO_LOCK(&pmp->pm_odevvp->v_bufobj);
964 pmp->pm_odevvp->v_bufobj.bo_flag &= ~BO_NOBUFS;
965 BO_UNLOCK(&pmp->pm_odevvp->v_bufobj);
966 atomic_store_rel_ptr((uintptr_t *)&pmp->pm_dev->si_mountpt, 0);
967 mntfs_freevp(pmp->pm_devvp);
968 vrele(pmp->pm_odevvp);
969 dev_rel(pmp->pm_dev);
970 free(pmp->pm_inusemap, M_MSDOSFSFAT);
971 lockdestroy(&pmp->pm_fatlock);
972 lockdestroy(&pmp->pm_checkpath_lock);
973 free(pmp, M_MSDOSFSMNT);
974 mp->mnt_data = NULL;
975 return (error);
976 }
977
978 static void
msdosfs_remount_ro(void * arg,int pending)979 msdosfs_remount_ro(void *arg, int pending)
980 {
981 struct msdosfsmount *pmp;
982 int error;
983
984 pmp = arg;
985
986 MSDOSFS_LOCK_MP(pmp);
987 if ((pmp->pm_flags & MSDOSFS_ERR_RO) != 0) {
988 while ((pmp->pm_flags & MSDOSFS_ERR_RO) != 0)
989 msleep(&pmp->pm_flags, &pmp->pm_fatlock, PVFS,
990 "msdoserrro", hz);
991 } else if ((pmp->pm_mountp->mnt_flag & MNT_RDONLY) == 0) {
992 pmp->pm_flags |= MSDOSFS_ERR_RO;
993 MSDOSFS_UNLOCK_MP(pmp);
994 printf("%s: remounting read-only due to corruption\n",
995 pmp->pm_mountp->mnt_stat.f_mntfromname);
996 error = vfs_remount_ro(pmp->pm_mountp);
997 if (error != 0)
998 printf("%s: remounting read-only failed: error %d\n",
999 pmp->pm_mountp->mnt_stat.f_mntfromname, error);
1000 else
1001 printf("remounted %s read-only\n",
1002 pmp->pm_mountp->mnt_stat.f_mntfromname);
1003 MSDOSFS_LOCK_MP(pmp);
1004 pmp->pm_flags &= ~MSDOSFS_ERR_RO;
1005 wakeup(&pmp->pm_flags);
1006 }
1007 MSDOSFS_UNLOCK_MP(pmp);
1008
1009 while (--pending >= 0)
1010 vfs_unbusy(pmp->pm_mountp);
1011 }
1012
1013 void
msdosfs_integrity_error(struct msdosfsmount * pmp)1014 msdosfs_integrity_error(struct msdosfsmount *pmp)
1015 {
1016 int error;
1017
1018 error = vfs_busy(pmp->pm_mountp, MBF_NOWAIT);
1019 if (error == 0) {
1020 error = taskqueue_enqueue(taskqueue_thread,
1021 &pmp->pm_rw2ro_task);
1022 if (error != 0) {
1023 printf("%s: integrity error scheduling failed, "
1024 "error %d\n",
1025 pmp->pm_mountp->mnt_stat.f_mntfromname, error);
1026 vfs_unbusy(pmp->pm_mountp);
1027 }
1028 } else {
1029 printf("%s: integrity error busying failed, error %d\n",
1030 pmp->pm_mountp->mnt_stat.f_mntfromname, error);
1031 }
1032 }
1033
1034 static int
msdosfs_root(struct mount * mp,int flags,struct vnode ** vpp)1035 msdosfs_root(struct mount *mp, int flags, struct vnode **vpp)
1036 {
1037 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
1038 struct denode *ndep;
1039 int error;
1040
1041 #ifdef MSDOSFS_DEBUG
1042 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp);
1043 #endif
1044 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, LK_EXCLUSIVE, &ndep);
1045 if (error)
1046 return (error);
1047 *vpp = DETOV(ndep);
1048 return (0);
1049 }
1050
1051 static int
msdosfs_statfs(struct mount * mp,struct statfs * sbp)1052 msdosfs_statfs(struct mount *mp, struct statfs *sbp)
1053 {
1054 struct msdosfsmount *pmp;
1055
1056 pmp = VFSTOMSDOSFS(mp);
1057 sbp->f_bsize = pmp->pm_bpcluster;
1058 sbp->f_iosize = pmp->pm_bpcluster;
1059 sbp->f_blocks = pmp->pm_maxcluster - CLUST_FIRST + 1;
1060 sbp->f_bfree = pmp->pm_freeclustercount;
1061 sbp->f_bavail = pmp->pm_freeclustercount;
1062 sbp->f_files = howmany(pmp->pm_rootdirsize * DEV_BSIZE,
1063 sizeof(struct direntry));
1064 sbp->f_ffree = pmp->pm_rootdirfree;
1065 return (0);
1066 }
1067
1068 /*
1069 * If we have an FSInfo block, update it.
1070 */
1071 static int
msdosfs_fsiflush(struct msdosfsmount * pmp,int waitfor)1072 msdosfs_fsiflush(struct msdosfsmount *pmp, int waitfor)
1073 {
1074 struct fsinfo *fp;
1075 struct buf *bp;
1076 int error;
1077
1078 MSDOSFS_LOCK_MP(pmp);
1079 if (pmp->pm_fsinfo == 0 || (pmp->pm_flags & MSDOSFS_FSIMOD) == 0) {
1080 error = 0;
1081 goto unlock;
1082 }
1083 error = bread(pmp->pm_devvp, pmp->pm_fsinfo, pmp->pm_BytesPerSec,
1084 NOCRED, &bp);
1085 if (error != 0) {
1086 goto unlock;
1087 }
1088 fp = (struct fsinfo *)bp->b_data;
1089 putulong(fp->fsinfree, pmp->pm_freeclustercount);
1090 putulong(fp->fsinxtfree, pmp->pm_nxtfree);
1091 pmp->pm_flags &= ~MSDOSFS_FSIMOD;
1092 if (waitfor == MNT_WAIT)
1093 error = bwrite(bp);
1094 else
1095 bawrite(bp);
1096 unlock:
1097 MSDOSFS_UNLOCK_MP(pmp);
1098 return (error);
1099 }
1100
1101 static int
msdosfs_sync(struct mount * mp,int waitfor)1102 msdosfs_sync(struct mount *mp, int waitfor)
1103 {
1104 struct vnode *vp, *nvp;
1105 struct thread *td;
1106 struct denode *dep;
1107 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
1108 int error, allerror = 0;
1109
1110 td = curthread;
1111
1112 /*
1113 * If we ever switch to not updating all of the FATs all the time,
1114 * this would be the place to update them from the first one.
1115 */
1116 if (pmp->pm_fmod != 0) {
1117 if (pmp->pm_flags & MSDOSFSMNT_RONLY)
1118 panic("msdosfs_sync: rofs mod");
1119 else {
1120 /* update FATs here */
1121 }
1122 }
1123 /*
1124 * Write back each (modified) denode.
1125 */
1126 loop:
1127 MNT_VNODE_FOREACH_ALL(vp, mp, nvp) {
1128 if (vp->v_type == VNON) {
1129 VI_UNLOCK(vp);
1130 continue;
1131 }
1132 dep = VTODE(vp);
1133 if ((dep->de_flag &
1134 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 &&
1135 (vp->v_bufobj.bo_dirty.bv_cnt == 0 ||
1136 waitfor == MNT_LAZY)) {
1137 VI_UNLOCK(vp);
1138 continue;
1139 }
1140 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK);
1141 if (error) {
1142 if (error == ENOENT) {
1143 MNT_VNODE_FOREACH_ALL_ABORT(mp, nvp);
1144 goto loop;
1145 }
1146 continue;
1147 }
1148 error = VOP_FSYNC(vp, waitfor, td);
1149 if (error)
1150 allerror = error;
1151 vput(vp);
1152 }
1153
1154 /*
1155 * Flush filesystem control info.
1156 */
1157 if (waitfor != MNT_LAZY) {
1158 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY);
1159 error = VOP_FSYNC(pmp->pm_devvp, waitfor, td);
1160 if (error)
1161 allerror = error;
1162 VOP_UNLOCK(pmp->pm_devvp);
1163 }
1164
1165 error = msdosfs_fsiflush(pmp, waitfor);
1166 if (error != 0)
1167 allerror = error;
1168
1169 if (allerror == 0 && waitfor == MNT_SUSPEND) {
1170 MNT_ILOCK(mp);
1171 mp->mnt_kern_flag |= MNTK_SUSPEND2 | MNTK_SUSPENDED;
1172 MNT_IUNLOCK(mp);
1173 }
1174 return (allerror);
1175 }
1176
1177 static int
msdosfs_fhtovp(struct mount * mp,struct fid * fhp,int flags,struct vnode ** vpp)1178 msdosfs_fhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp)
1179 {
1180 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
1181 struct defid *defhp = (struct defid *) fhp;
1182 struct denode *dep;
1183 int error;
1184
1185 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs,
1186 LK_EXCLUSIVE, &dep);
1187 if (error) {
1188 *vpp = NULLVP;
1189 return (error);
1190 }
1191 *vpp = DETOV(dep);
1192 vnode_create_vobject(*vpp, dep->de_FileSize, curthread);
1193 return (0);
1194 }
1195
1196 static struct vfsops msdosfs_vfsops = {
1197 .vfs_fhtovp = msdosfs_fhtovp,
1198 .vfs_mount = msdosfs_mount,
1199 .vfs_cmount = msdosfs_cmount,
1200 .vfs_root = msdosfs_root,
1201 .vfs_statfs = msdosfs_statfs,
1202 .vfs_sync = msdosfs_sync,
1203 .vfs_unmount = msdosfs_unmount,
1204 };
1205
1206 VFS_SET(msdosfs_vfsops, msdosfs, 0);
1207 MODULE_VERSION(msdosfs, 1);
1208