1 | /* $NetBSD: msdosfs_vfsops.c,v 1.118 2015/03/28 19:24:05 maxv Exp $ */ |
2 | |
3 | /*- |
4 | * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. |
5 | * Copyright (C) 1994, 1995, 1997 TooLs GmbH. |
6 | * All rights reserved. |
7 | * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). |
8 | * |
9 | * Redistribution and use in source and binary forms, with or without |
10 | * modification, are permitted provided that the following conditions |
11 | * are met: |
12 | * 1. Redistributions of source code must retain the above copyright |
13 | * notice, this list of conditions and the following disclaimer. |
14 | * 2. Redistributions in binary form must reproduce the above copyright |
15 | * notice, this list of conditions and the following disclaimer in the |
16 | * documentation and/or other materials provided with the distribution. |
17 | * 3. All advertising materials mentioning features or use of this software |
18 | * must display the following acknowledgement: |
19 | * This product includes software developed by TooLs GmbH. |
20 | * 4. The name of TooLs GmbH may not be used to endorse or promote products |
21 | * derived from this software without specific prior written permission. |
22 | * |
23 | * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR |
24 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
25 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
26 | * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
27 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
28 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
29 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
30 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
31 | * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
32 | * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
33 | */ |
34 | /* |
35 | * Written by Paul Popelka (paulp@uts.amdahl.com) |
36 | * |
37 | * You can do anything you want with this software, just don't say you wrote |
38 | * it, and don't remove this notice. |
39 | * |
40 | * This software is provided "as is". |
41 | * |
42 | * The author supplies this software to be publicly redistributed on the |
43 | * understanding that the author is not responsible for the correct |
44 | * functioning of this software in any circumstances and is not liable for |
45 | * any damages caused by this software. |
46 | * |
47 | * October 1992 |
48 | */ |
49 | |
50 | #include <sys/cdefs.h> |
51 | __KERNEL_RCSID(0, "$NetBSD: msdosfs_vfsops.c,v 1.118 2015/03/28 19:24:05 maxv Exp $" ); |
52 | |
53 | #if defined(_KERNEL_OPT) |
54 | #include "opt_compat_netbsd.h" |
55 | #endif |
56 | |
57 | #include <sys/param.h> |
58 | #include <sys/systm.h> |
59 | #include <sys/sysctl.h> |
60 | #include <sys/namei.h> |
61 | #include <sys/proc.h> |
62 | #include <sys/kernel.h> |
63 | #include <sys/vnode.h> |
64 | #include <miscfs/genfs/genfs.h> |
65 | #include <miscfs/specfs/specdev.h> /* XXX */ /* defines v_rdev */ |
66 | #include <sys/mount.h> |
67 | #include <sys/buf.h> |
68 | #include <sys/file.h> |
69 | #include <sys/device.h> |
70 | #include <sys/disklabel.h> |
71 | #include <sys/disk.h> |
72 | #include <sys/fstrans.h> |
73 | #include <sys/ioctl.h> |
74 | #include <sys/malloc.h> |
75 | #include <sys/dirent.h> |
76 | #include <sys/stat.h> |
77 | #include <sys/conf.h> |
78 | #include <sys/kauth.h> |
79 | #include <sys/module.h> |
80 | |
81 | #include <fs/msdosfs/bpb.h> |
82 | #include <fs/msdosfs/bootsect.h> |
83 | #include <fs/msdosfs/direntry.h> |
84 | #include <fs/msdosfs/denode.h> |
85 | #include <fs/msdosfs/msdosfsmount.h> |
86 | #include <fs/msdosfs/fat.h> |
87 | |
88 | MODULE(MODULE_CLASS_VFS, msdos, NULL); |
89 | |
90 | #ifdef MSDOSFS_DEBUG |
91 | #define DPRINTF(fmt, ...) uprintf("%s(): " fmt "\n", __func__, ##__VA_ARGS__) |
92 | #else |
93 | #define DPRINTF(fmt, ...) |
94 | #endif |
95 | |
96 | #define GEMDOSFS_BSIZE 512 |
97 | |
98 | #define MSDOSFS_NAMEMAX(pmp) \ |
99 | (pmp)->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12 |
100 | |
101 | int msdosfs_mountfs(struct vnode *, struct mount *, struct lwp *, |
102 | struct msdosfs_args *); |
103 | |
104 | static int update_mp(struct mount *, struct msdosfs_args *); |
105 | |
106 | MALLOC_JUSTDEFINE(M_MSDOSFSMNT, "MSDOSFS mount" , "MSDOS FS mount structure" ); |
107 | MALLOC_JUSTDEFINE(M_MSDOSFSFAT, "MSDOSFS FAT" , "MSDOS FS FAT table" ); |
108 | MALLOC_JUSTDEFINE(M_MSDOSFSTMP, "MSDOSFS temp" , "MSDOS FS temp. structures" ); |
109 | |
110 | static struct sysctllog *msdosfs_sysctl_log; |
111 | |
112 | extern const struct vnodeopv_desc msdosfs_vnodeop_opv_desc; |
113 | |
114 | const struct vnodeopv_desc * const msdosfs_vnodeopv_descs[] = { |
115 | &msdosfs_vnodeop_opv_desc, |
116 | NULL, |
117 | }; |
118 | |
119 | struct vfsops msdosfs_vfsops = { |
120 | .vfs_name = MOUNT_MSDOS, |
121 | .vfs_min_mount_data = sizeof (struct msdosfs_args), |
122 | .vfs_mount = msdosfs_mount, |
123 | .vfs_start = msdosfs_start, |
124 | .vfs_unmount = msdosfs_unmount, |
125 | .vfs_root = msdosfs_root, |
126 | .vfs_quotactl = (void *)eopnotsupp, |
127 | .vfs_statvfs = msdosfs_statvfs, |
128 | .vfs_sync = msdosfs_sync, |
129 | .vfs_vget = msdosfs_vget, |
130 | .vfs_loadvnode = msdosfs_loadvnode, |
131 | .vfs_fhtovp = msdosfs_fhtovp, |
132 | .vfs_vptofh = msdosfs_vptofh, |
133 | .vfs_init = msdosfs_init, |
134 | .vfs_reinit = msdosfs_reinit, |
135 | .vfs_done = msdosfs_done, |
136 | .vfs_mountroot = msdosfs_mountroot, |
137 | .vfs_snapshot = (void *)eopnotsupp, |
138 | .vfs_extattrctl = vfs_stdextattrctl, |
139 | .vfs_suspendctl = msdosfs_suspendctl, |
140 | .vfs_renamelock_enter = genfs_renamelock_enter, |
141 | .vfs_renamelock_exit = genfs_renamelock_exit, |
142 | .vfs_fsync = (void *)eopnotsupp, |
143 | .vfs_opv_descs = msdosfs_vnodeopv_descs |
144 | }; |
145 | |
146 | static int |
147 | msdos_modcmd(modcmd_t cmd, void *arg) |
148 | { |
149 | int error; |
150 | |
151 | switch (cmd) { |
152 | case MODULE_CMD_INIT: |
153 | error = vfs_attach(&msdosfs_vfsops); |
154 | if (error != 0) |
155 | break; |
156 | sysctl_createv(&msdosfs_sysctl_log, 0, NULL, NULL, |
157 | CTLFLAG_PERMANENT, |
158 | CTLTYPE_NODE, "msdosfs" , |
159 | SYSCTL_DESCR("MS-DOS file system" ), |
160 | NULL, 0, NULL, 0, |
161 | CTL_VFS, 4, CTL_EOL); |
162 | /* |
163 | * XXX the "4" above could be dynamic, thereby eliminating one |
164 | * more instance of the "number to vfs" mapping problem, but |
165 | * "4" is the order as taken from sys/mount.h |
166 | */ |
167 | break; |
168 | case MODULE_CMD_FINI: |
169 | error = vfs_detach(&msdosfs_vfsops); |
170 | if (error != 0) |
171 | break; |
172 | sysctl_teardown(&msdosfs_sysctl_log); |
173 | break; |
174 | default: |
175 | error = ENOTTY; |
176 | break; |
177 | } |
178 | |
179 | return (error); |
180 | } |
181 | |
182 | static int |
183 | update_mp(struct mount *mp, struct msdosfs_args *argp) |
184 | { |
185 | struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); |
186 | int error; |
187 | |
188 | pmp->pm_gid = argp->gid; |
189 | pmp->pm_uid = argp->uid; |
190 | pmp->pm_mask = argp->mask & ALLPERMS; |
191 | pmp->pm_dirmask = argp->dirmask & ALLPERMS; |
192 | pmp->pm_gmtoff = argp->gmtoff; |
193 | pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT; |
194 | |
195 | /* |
196 | * GEMDOS knows nothing about win95 long filenames |
197 | */ |
198 | if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS) |
199 | pmp->pm_flags |= MSDOSFSMNT_NOWIN95; |
200 | |
201 | if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) |
202 | pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; |
203 | else if (!(pmp->pm_flags & |
204 | (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { |
205 | struct vnode *rtvp; |
206 | |
207 | /* |
208 | * Try to divine whether to support Win'95 long filenames |
209 | */ |
210 | if (FAT32(pmp)) |
211 | pmp->pm_flags |= MSDOSFSMNT_LONGNAME; |
212 | else { |
213 | if ((error = msdosfs_root(mp, &rtvp)) != 0) |
214 | return error; |
215 | pmp->pm_flags |= findwin95(VTODE(rtvp)) |
216 | ? MSDOSFSMNT_LONGNAME |
217 | : MSDOSFSMNT_SHORTNAME; |
218 | vput(rtvp); |
219 | } |
220 | } |
221 | |
222 | mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); |
223 | |
224 | return 0; |
225 | } |
226 | |
227 | int |
228 | msdosfs_mountroot(void) |
229 | { |
230 | struct mount *mp; |
231 | struct lwp *l = curlwp; /* XXX */ |
232 | int error; |
233 | struct msdosfs_args args; |
234 | |
235 | if (device_class(root_device) != DV_DISK) |
236 | return (ENODEV); |
237 | |
238 | if ((error = vfs_rootmountalloc(MOUNT_MSDOS, "root_device" , &mp))) { |
239 | vrele(rootvp); |
240 | return (error); |
241 | } |
242 | |
243 | args.flags = MSDOSFSMNT_VERSIONED; |
244 | args.uid = 0; |
245 | args.gid = 0; |
246 | args.mask = 0777; |
247 | args.version = MSDOSFSMNT_VERSION; |
248 | args.dirmask = 0777; |
249 | |
250 | if ((error = msdosfs_mountfs(rootvp, mp, l, &args)) != 0) { |
251 | vfs_unbusy(mp, false, NULL); |
252 | vfs_destroy(mp); |
253 | return (error); |
254 | } |
255 | |
256 | if ((error = update_mp(mp, &args)) != 0) { |
257 | (void)msdosfs_unmount(mp, 0); |
258 | vfs_unbusy(mp, false, NULL); |
259 | vfs_destroy(mp); |
260 | vrele(rootvp); |
261 | return (error); |
262 | } |
263 | |
264 | mountlist_append(mp); |
265 | (void)msdosfs_statvfs(mp, &mp->mnt_stat); |
266 | vfs_unbusy(mp, false, NULL); |
267 | return (0); |
268 | } |
269 | |
270 | /* |
271 | * mp - path - addr in user space of mount point (ie /usr or whatever) |
272 | * data - addr in user space of mount params including the name of the block |
273 | * special file to treat as a filesystem. |
274 | */ |
275 | int |
276 | msdosfs_mount(struct mount *mp, const char *path, void *data, size_t *data_len) |
277 | { |
278 | struct lwp *l = curlwp; |
279 | struct vnode *devvp; /* vnode for blk device to mount */ |
280 | struct msdosfs_args *args = data; /* holds data from mount request */ |
281 | /* msdosfs specific mount control block */ |
282 | struct msdosfsmount *pmp = NULL; |
283 | int error, flags; |
284 | mode_t accessmode; |
285 | |
286 | if (args == NULL) |
287 | return EINVAL; |
288 | if (*data_len < sizeof *args) |
289 | return EINVAL; |
290 | |
291 | if (mp->mnt_flag & MNT_GETARGS) { |
292 | pmp = VFSTOMSDOSFS(mp); |
293 | if (pmp == NULL) |
294 | return EIO; |
295 | args->fspec = NULL; |
296 | args->uid = pmp->pm_uid; |
297 | args->gid = pmp->pm_gid; |
298 | args->mask = pmp->pm_mask; |
299 | args->flags = pmp->pm_flags; |
300 | args->version = MSDOSFSMNT_VERSION; |
301 | args->dirmask = pmp->pm_dirmask; |
302 | args->gmtoff = pmp->pm_gmtoff; |
303 | *data_len = sizeof *args; |
304 | return 0; |
305 | } |
306 | |
307 | /* |
308 | * If not versioned (i.e. using old mount_msdos(8)), fill in |
309 | * the additional structure items with suitable defaults. |
310 | */ |
311 | if ((args->flags & MSDOSFSMNT_VERSIONED) == 0) { |
312 | args->version = 1; |
313 | args->dirmask = args->mask; |
314 | } |
315 | |
316 | /* |
317 | * Reset GMT offset for pre-v3 mount structure args. |
318 | */ |
319 | if (args->version < 3) |
320 | args->gmtoff = 0; |
321 | |
322 | /* |
323 | * If updating, check whether changing from read-only to |
324 | * read/write; if there is no device name, that's all we do. |
325 | */ |
326 | if (mp->mnt_flag & MNT_UPDATE) { |
327 | pmp = VFSTOMSDOSFS(mp); |
328 | error = 0; |
329 | if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && |
330 | (mp->mnt_flag & MNT_RDONLY)) { |
331 | flags = WRITECLOSE; |
332 | if (mp->mnt_flag & MNT_FORCE) |
333 | flags |= FORCECLOSE; |
334 | error = vflush(mp, NULLVP, flags); |
335 | } |
336 | if (!error && (mp->mnt_flag & MNT_RELOAD)) |
337 | /* not yet implemented */ |
338 | error = EOPNOTSUPP; |
339 | if (error) { |
340 | DPRINTF("vflush %d" , error); |
341 | return (error); |
342 | } |
343 | if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && |
344 | (mp->mnt_iflag & IMNT_WANTRDWR)) { |
345 | /* |
346 | * If upgrade to read-write by non-root, then verify |
347 | * that user has necessary permissions on the device. |
348 | * |
349 | * Permission to update a mount is checked higher, so |
350 | * here we presume updating the mount is okay (for |
351 | * example, as far as securelevel goes) which leaves us |
352 | * with the normal check. |
353 | */ |
354 | devvp = pmp->pm_devvp; |
355 | vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); |
356 | error = kauth_authorize_system(l->l_cred, |
357 | KAUTH_SYSTEM_MOUNT, KAUTH_REQ_SYSTEM_MOUNT_DEVICE, |
358 | mp, devvp, KAUTH_ARG(VREAD | VWRITE)); |
359 | VOP_UNLOCK(devvp); |
360 | DPRINTF("KAUTH_REQ_SYSTEM_MOUNT_DEVICE %d" , error); |
361 | if (error) |
362 | return (error); |
363 | |
364 | pmp->pm_flags &= ~MSDOSFSMNT_RONLY; |
365 | } |
366 | if (args->fspec == NULL) { |
367 | DPRINTF("missing fspec" ); |
368 | return EINVAL; |
369 | } |
370 | } |
371 | /* |
372 | * Not an update, or updating the name: look up the name |
373 | * and verify that it refers to a sensible block device. |
374 | */ |
375 | error = namei_simple_user(args->fspec, |
376 | NSM_FOLLOW_NOEMULROOT, &devvp); |
377 | if (error != 0) { |
378 | DPRINTF("namei %d" , error); |
379 | return (error); |
380 | } |
381 | |
382 | if (devvp->v_type != VBLK) { |
383 | DPRINTF("not block" ); |
384 | vrele(devvp); |
385 | return (ENOTBLK); |
386 | } |
387 | if (bdevsw_lookup(devvp->v_rdev) == NULL) { |
388 | DPRINTF("no block switch" ); |
389 | vrele(devvp); |
390 | return (ENXIO); |
391 | } |
392 | /* |
393 | * If mount by non-root, then verify that user has necessary |
394 | * permissions on the device. |
395 | */ |
396 | accessmode = VREAD; |
397 | if ((mp->mnt_flag & MNT_RDONLY) == 0) |
398 | accessmode |= VWRITE; |
399 | vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); |
400 | error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, |
401 | KAUTH_REQ_SYSTEM_MOUNT_DEVICE, mp, devvp, KAUTH_ARG(accessmode)); |
402 | VOP_UNLOCK(devvp); |
403 | if (error) { |
404 | DPRINTF("KAUTH_REQ_SYSTEM_MOUNT_DEVICE %d" , error); |
405 | vrele(devvp); |
406 | return (error); |
407 | } |
408 | if ((mp->mnt_flag & MNT_UPDATE) == 0) { |
409 | int xflags; |
410 | |
411 | if (mp->mnt_flag & MNT_RDONLY) |
412 | xflags = FREAD; |
413 | else |
414 | xflags = FREAD|FWRITE; |
415 | vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); |
416 | error = VOP_OPEN(devvp, xflags, FSCRED); |
417 | VOP_UNLOCK(devvp); |
418 | if (error) { |
419 | DPRINTF("VOP_OPEN %d" , error); |
420 | goto fail; |
421 | } |
422 | error = msdosfs_mountfs(devvp, mp, l, args); |
423 | if (error) { |
424 | DPRINTF("msdosfs_mountfs %d" , error); |
425 | vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); |
426 | (void) VOP_CLOSE(devvp, xflags, NOCRED); |
427 | VOP_UNLOCK(devvp); |
428 | goto fail; |
429 | } |
430 | #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ |
431 | pmp = VFSTOMSDOSFS(mp); |
432 | #endif |
433 | } else { |
434 | vrele(devvp); |
435 | if (devvp != pmp->pm_devvp) { |
436 | DPRINTF("devvp %p pmp %p" , devvp, pmp->pm_devvp); |
437 | return (EINVAL); /* needs translation */ |
438 | } |
439 | } |
440 | if ((error = update_mp(mp, args)) != 0) { |
441 | msdosfs_unmount(mp, MNT_FORCE); |
442 | DPRINTF("update_mp %d" , error); |
443 | return error; |
444 | } |
445 | |
446 | #ifdef MSDOSFS_DEBUG |
447 | printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n" , mp, pmp, pmp->pm_inusemap); |
448 | #endif |
449 | return set_statvfs_info(path, UIO_USERSPACE, args->fspec, UIO_USERSPACE, |
450 | mp->mnt_op->vfs_name, mp, l); |
451 | |
452 | fail: |
453 | vrele(devvp); |
454 | return (error); |
455 | } |
456 | |
457 | int |
458 | msdosfs_mountfs(struct vnode *devvp, struct mount *mp, struct lwp *l, struct msdosfs_args *argp) |
459 | { |
460 | struct msdosfsmount *pmp; |
461 | struct buf *bp; |
462 | dev_t dev = devvp->v_rdev; |
463 | union bootsector *bsp; |
464 | struct byte_bpb33 *b33; |
465 | struct byte_bpb50 *b50; |
466 | struct byte_bpb710 *b710; |
467 | uint8_t SecPerClust; |
468 | int ronly, error, BlkPerSec; |
469 | uint64_t psize; |
470 | unsigned secsize; |
471 | |
472 | /* Flush out any old buffers remaining from a previous use. */ |
473 | if ((error = vinvalbuf(devvp, V_SAVE, l->l_cred, l, 0, 0)) != 0) |
474 | return (error); |
475 | |
476 | ronly = (mp->mnt_flag & MNT_RDONLY) != 0; |
477 | |
478 | bp = NULL; /* both used in error_exit */ |
479 | pmp = NULL; |
480 | |
481 | error = fstrans_mount(mp); |
482 | if (error) |
483 | goto error_exit; |
484 | |
485 | error = getdisksize(devvp, &psize, &secsize); |
486 | if (error) { |
487 | if (argp->flags & MSDOSFSMNT_GEMDOSFS) |
488 | goto error_exit; |
489 | |
490 | /* ok, so it failed. we most likely don't need the info */ |
491 | secsize = DEV_BSIZE; |
492 | psize = 0; |
493 | error = 0; |
494 | } |
495 | if (secsize < DEV_BSIZE) { |
496 | DPRINTF("Invalid block secsize (%d < DEV_BSIZE)" , secsize); |
497 | error = EINVAL; |
498 | goto error_exit; |
499 | } |
500 | |
501 | if (argp->flags & MSDOSFSMNT_GEMDOSFS) { |
502 | if (secsize != GEMDOSFS_BSIZE) { |
503 | DPRINTF("Invalid block secsize %d for GEMDOS" , secsize); |
504 | error = EINVAL; |
505 | goto error_exit; |
506 | } |
507 | } |
508 | |
509 | /* |
510 | * Read the boot sector of the filesystem, and then check the |
511 | * boot signature. If not a dos boot sector then error out. |
512 | */ |
513 | if (secsize < sizeof(*b50)) { |
514 | DPRINTF("50 bootsec %u\n" , secsize); |
515 | error = EINVAL; |
516 | goto error_exit; |
517 | } |
518 | if ((error = bread(devvp, 0, secsize, 0, &bp)) != 0) |
519 | goto error_exit; |
520 | bsp = (union bootsector *)bp->b_data; |
521 | b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; |
522 | b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; |
523 | b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB; |
524 | |
525 | if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { |
526 | if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 |
527 | || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { |
528 | DPRINTF("bootsig0 %d bootsig1 %d" , |
529 | bsp->bs50.bsBootSectSig0, |
530 | bsp->bs50.bsBootSectSig1); |
531 | error = EINVAL; |
532 | goto error_exit; |
533 | } |
534 | } |
535 | |
536 | pmp = malloc(sizeof(*pmp), M_MSDOSFSMNT, M_WAITOK|M_ZERO); |
537 | pmp->pm_mountp = mp; |
538 | |
539 | /* |
540 | * Compute several useful quantities from the bpb in the |
541 | * bootsector. Copy in the dos 5 variant of the bpb then fix up |
542 | * the fields that are different between dos 5 and dos 3.3. |
543 | */ |
544 | SecPerClust = b50->bpbSecPerClust; |
545 | pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); |
546 | pmp->pm_ResSectors = getushort(b50->bpbResSectors); |
547 | pmp->pm_FATs = b50->bpbFATs; |
548 | pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); |
549 | pmp->pm_Sectors = getushort(b50->bpbSectors); |
550 | pmp->pm_FATsecs = getushort(b50->bpbFATsecs); |
551 | pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); |
552 | pmp->pm_Heads = getushort(b50->bpbHeads); |
553 | pmp->pm_Media = b50->bpbMedia; |
554 | |
555 | if (pmp->pm_Sectors == 0) { |
556 | pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); |
557 | pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); |
558 | } else { |
559 | if (secsize < sizeof(*b33)) { |
560 | DPRINTF("33 bootsec %u\n" , secsize); |
561 | error = EINVAL; |
562 | goto error_exit; |
563 | } |
564 | pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); |
565 | pmp->pm_HugeSectors = pmp->pm_Sectors; |
566 | } |
567 | |
568 | /* |
569 | * Sanity checks, from the FAT specification: |
570 | * - sectors per cluster: >= 1, power of 2 |
571 | * - logical sector size: >= 1, power of 2 |
572 | * - cluster size: <= max FS block size |
573 | * - number of sectors: >= 1 |
574 | */ |
575 | if ((SecPerClust == 0) || !powerof2(SecPerClust) || |
576 | (pmp->pm_BytesPerSec == 0) || !powerof2(pmp->pm_BytesPerSec) || |
577 | (SecPerClust * pmp->pm_BytesPerSec > MAXBSIZE) || |
578 | (pmp->pm_HugeSectors == 0)) { |
579 | DPRINTF("consistency checks" ); |
580 | error = EINVAL; |
581 | goto error_exit; |
582 | } |
583 | |
584 | if (!(argp->flags & MSDOSFSMNT_GEMDOSFS) && |
585 | (pmp->pm_SecPerTrack > 63)) { |
586 | DPRINTF("SecPerTrack %d" , pmp->pm_SecPerTrack); |
587 | error = EINVAL; |
588 | goto error_exit; |
589 | } |
590 | |
591 | if (pmp->pm_RootDirEnts == 0) { |
592 | if (secsize < sizeof(*b710)) { |
593 | DPRINTF("710 bootsec %u\n" , secsize); |
594 | error = EINVAL; |
595 | goto error_exit; |
596 | } |
597 | unsigned short FSVers = getushort(b710->bpbFSVers); |
598 | unsigned short ExtFlags = getushort(b710->bpbExtFlags); |
599 | /* |
600 | * Some say that bsBootSectSig[23] must be zero, but |
601 | * Windows does not require this and some digital cameras |
602 | * do not set these to zero. Therefore, do not insist. |
603 | */ |
604 | if (pmp->pm_Sectors || pmp->pm_FATsecs || FSVers) { |
605 | DPRINTF("Sectors %d FATsecs %lu FSVers %d" , |
606 | pmp->pm_Sectors, pmp->pm_FATsecs, FSVers); |
607 | error = EINVAL; |
608 | goto error_exit; |
609 | } |
610 | pmp->pm_fatmask = FAT32_MASK; |
611 | pmp->pm_fatmult = 4; |
612 | pmp->pm_fatdiv = 1; |
613 | pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); |
614 | |
615 | /* Mirroring is enabled if the FATMIRROR bit is not set. */ |
616 | if ((ExtFlags & FATMIRROR) == 0) |
617 | pmp->pm_flags |= MSDOSFS_FATMIRROR; |
618 | else |
619 | pmp->pm_curfat = ExtFlags & FATNUM; |
620 | } else |
621 | pmp->pm_flags |= MSDOSFS_FATMIRROR; |
622 | |
623 | if (argp->flags & MSDOSFSMNT_GEMDOSFS) { |
624 | if (FAT32(pmp)) { |
625 | /* GEMDOS doesn't know FAT32. */ |
626 | DPRINTF("FAT32 for GEMDOS" ); |
627 | error = EINVAL; |
628 | goto error_exit; |
629 | } |
630 | |
631 | /* |
632 | * Check a few values (could do some more): |
633 | * - logical sector size: >= block size |
634 | * - number of sectors: <= size of partition |
635 | */ |
636 | if ((pmp->pm_BytesPerSec < GEMDOSFS_BSIZE) || |
637 | (pmp->pm_HugeSectors * |
638 | (pmp->pm_BytesPerSec / GEMDOSFS_BSIZE) > psize)) { |
639 | DPRINTF("consistency checks for GEMDOS" ); |
640 | error = EINVAL; |
641 | goto error_exit; |
642 | } |
643 | /* |
644 | * XXX - Many parts of the msdosfs driver seem to assume that |
645 | * the number of bytes per logical sector (BytesPerSec) will |
646 | * always be the same as the number of bytes per disk block |
647 | * Let's pretend it is. |
648 | */ |
649 | BlkPerSec = pmp->pm_BytesPerSec / GEMDOSFS_BSIZE; |
650 | pmp->pm_BytesPerSec = GEMDOSFS_BSIZE; |
651 | pmp->pm_HugeSectors *= BlkPerSec; |
652 | pmp->pm_HiddenSects *= BlkPerSec; |
653 | pmp->pm_ResSectors *= BlkPerSec; |
654 | pmp->pm_Sectors *= BlkPerSec; |
655 | pmp->pm_FATsecs *= BlkPerSec; |
656 | SecPerClust *= BlkPerSec; |
657 | } |
658 | |
659 | /* Check that fs has nonzero FAT size */ |
660 | if (pmp->pm_FATsecs == 0) { |
661 | DPRINTF("FATsecs is 0" ); |
662 | error = EINVAL; |
663 | goto error_exit; |
664 | } |
665 | |
666 | pmp->pm_fatblk = pmp->pm_ResSectors; |
667 | if (FAT32(pmp)) { |
668 | if (secsize < sizeof(*b710)) { |
669 | DPRINTF("710 bootsec %u\n" , secsize); |
670 | error = EINVAL; |
671 | goto error_exit; |
672 | } |
673 | pmp->pm_rootdirblk = getulong(b710->bpbRootClust); |
674 | pmp->pm_firstcluster = pmp->pm_fatblk |
675 | + (pmp->pm_FATs * pmp->pm_FATsecs); |
676 | pmp->pm_fsinfo = getushort(b710->bpbFSInfo); |
677 | } else { |
678 | pmp->pm_rootdirblk = pmp->pm_fatblk + |
679 | (pmp->pm_FATs * pmp->pm_FATsecs); |
680 | pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) |
681 | + pmp->pm_BytesPerSec - 1) |
682 | / pmp->pm_BytesPerSec;/* in sectors */ |
683 | pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; |
684 | } |
685 | |
686 | pmp->pm_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / |
687 | SecPerClust; |
688 | pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 1; |
689 | pmp->pm_fatsize = pmp->pm_FATsecs * pmp->pm_BytesPerSec; |
690 | |
691 | if (argp->flags & MSDOSFSMNT_GEMDOSFS) { |
692 | if (pmp->pm_nmbrofclusters <= (0xff0 - 2)) { |
693 | pmp->pm_fatmask = FAT12_MASK; |
694 | pmp->pm_fatmult = 3; |
695 | pmp->pm_fatdiv = 2; |
696 | } else { |
697 | pmp->pm_fatmask = FAT16_MASK; |
698 | pmp->pm_fatmult = 2; |
699 | pmp->pm_fatdiv = 1; |
700 | } |
701 | } else if (pmp->pm_fatmask == 0) { |
702 | if (pmp->pm_maxcluster |
703 | <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { |
704 | /* |
705 | * This will usually be a floppy disk. This size makes |
706 | * sure that one FAT entry will not be split across |
707 | * multiple blocks. |
708 | */ |
709 | pmp->pm_fatmask = FAT12_MASK; |
710 | pmp->pm_fatmult = 3; |
711 | pmp->pm_fatdiv = 2; |
712 | } else { |
713 | pmp->pm_fatmask = FAT16_MASK; |
714 | pmp->pm_fatmult = 2; |
715 | pmp->pm_fatdiv = 1; |
716 | } |
717 | } |
718 | if (FAT12(pmp)) |
719 | pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; |
720 | else |
721 | pmp->pm_fatblocksize = MAXBSIZE; |
722 | |
723 | pmp->pm_fatblocksec = pmp->pm_fatblocksize / pmp->pm_BytesPerSec; |
724 | pmp->pm_bnshift = ffs(pmp->pm_BytesPerSec) - 1; |
725 | |
726 | /* |
727 | * Compute mask and shift value for isolating cluster relative byte |
728 | * offsets and cluster numbers from a file offset. |
729 | */ |
730 | pmp->pm_bpcluster = SecPerClust * pmp->pm_BytesPerSec; |
731 | pmp->pm_crbomask = pmp->pm_bpcluster - 1; |
732 | pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; |
733 | |
734 | /* |
735 | * Check for valid cluster size |
736 | * must be a power of 2 |
737 | */ |
738 | if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { |
739 | DPRINTF("bpcluster %lu cnshift %lu" , pmp->pm_bpcluster, |
740 | pmp->pm_cnshift); |
741 | error = EINVAL; |
742 | goto error_exit; |
743 | } |
744 | |
745 | /* |
746 | * Cluster size must be within limit of MAXBSIZE. |
747 | * Many FAT filesystems will not have clusters larger than |
748 | * 32KiB due to limits in Windows versions before Vista. |
749 | */ |
750 | if (pmp->pm_bpcluster > MAXBSIZE) { |
751 | DPRINTF("bpcluster %lu > MAXBSIZE %d" , |
752 | pmp->pm_bpcluster, MAXBSIZE); |
753 | error = EINVAL; |
754 | goto error_exit; |
755 | } |
756 | |
757 | /* |
758 | * Release the bootsector buffer. |
759 | */ |
760 | brelse(bp, BC_AGE); |
761 | bp = NULL; |
762 | |
763 | /* |
764 | * Check FSInfo. |
765 | */ |
766 | if (pmp->pm_fsinfo) { |
767 | struct fsinfo *fp; |
768 | const int rdsz = roundup(sizeof(*fp), pmp->pm_BytesPerSec); |
769 | |
770 | /* |
771 | * XXX If the fsinfo block is stored on media with |
772 | * 2KB or larger sectors, is the fsinfo structure |
773 | * padded at the end or in the middle? |
774 | */ |
775 | if ((error = bread(devvp, de_bn2kb(pmp, pmp->pm_fsinfo), |
776 | rdsz, 0, &bp)) != 0) |
777 | goto error_exit; |
778 | fp = (struct fsinfo *)bp->b_data; |
779 | if (!memcmp(fp->fsisig1, "RRaA" , 4) |
780 | && !memcmp(fp->fsisig2, "rrAa" , 4) |
781 | && !memcmp(fp->fsisig3, "\0\0\125\252" , 4) |
782 | && !memcmp(fp->fsisig4, "\0\0\125\252" , 4)) |
783 | pmp->pm_nxtfree = getulong(fp->fsinxtfree); |
784 | else |
785 | pmp->pm_fsinfo = 0; |
786 | brelse(bp, 0); |
787 | bp = NULL; |
788 | } |
789 | |
790 | /* |
791 | * Check and validate (or perhaps invalidate?) the fsinfo structure? |
792 | * XXX |
793 | */ |
794 | if (pmp->pm_fsinfo) { |
795 | if ((pmp->pm_nxtfree == 0xffffffffUL) || |
796 | (pmp->pm_nxtfree > pmp->pm_maxcluster)) |
797 | pmp->pm_fsinfo = 0; |
798 | } |
799 | |
800 | /* |
801 | * Allocate memory for the bitmap of allocated clusters, and then |
802 | * fill it in. |
803 | */ |
804 | pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS) |
805 | / N_INUSEBITS) |
806 | * sizeof(*pmp->pm_inusemap), |
807 | M_MSDOSFSFAT, M_WAITOK); |
808 | |
809 | /* |
810 | * fillinusemap() needs pm_devvp. |
811 | */ |
812 | pmp->pm_dev = dev; |
813 | pmp->pm_devvp = devvp; |
814 | |
815 | /* |
816 | * Have the inuse map filled in. |
817 | */ |
818 | if ((error = fillinusemap(pmp)) != 0) { |
819 | DPRINTF("fillinusemap %d" , error); |
820 | goto error_exit; |
821 | } |
822 | |
823 | /* |
824 | * If they want FAT updates to be synchronous then let them suffer |
825 | * the performance degradation in exchange for the on disk copy of |
826 | * the FAT being correct just about all the time. I suppose this |
827 | * would be a good thing to turn on if the kernel is still flakey. |
828 | */ |
829 | if (mp->mnt_flag & MNT_SYNCHRONOUS) |
830 | pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; |
831 | |
832 | /* |
833 | * Finish up. |
834 | */ |
835 | if (ronly) |
836 | pmp->pm_flags |= MSDOSFSMNT_RONLY; |
837 | else |
838 | pmp->pm_fmod = 1; |
839 | mp->mnt_data = pmp; |
840 | mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev; |
841 | mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_MSDOS); |
842 | mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; |
843 | mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); |
844 | mp->mnt_flag |= MNT_LOCAL; |
845 | mp->mnt_dev_bshift = pmp->pm_bnshift; |
846 | mp->mnt_fs_bshift = pmp->pm_cnshift; |
847 | |
848 | /* |
849 | * If we ever do quotas for DOS filesystems this would be a place |
850 | * to fill in the info in the msdosfsmount structure. You dolt, |
851 | * quotas on dos filesystems make no sense because files have no |
852 | * owners on dos filesystems. of course there is some empty space |
853 | * in the directory entry where we could put uid's and gid's. |
854 | */ |
855 | |
856 | spec_node_setmountedfs(devvp, mp); |
857 | |
858 | return (0); |
859 | |
860 | error_exit: |
861 | fstrans_unmount(mp); |
862 | if (bp) |
863 | brelse(bp, BC_AGE); |
864 | if (pmp) { |
865 | if (pmp->pm_inusemap) |
866 | free(pmp->pm_inusemap, M_MSDOSFSFAT); |
867 | free(pmp, M_MSDOSFSMNT); |
868 | mp->mnt_data = NULL; |
869 | } |
870 | return (error); |
871 | } |
872 | |
873 | int |
874 | msdosfs_start(struct mount *mp, int flags) |
875 | { |
876 | |
877 | return (0); |
878 | } |
879 | |
880 | /* |
881 | * Unmount the filesystem described by mp. |
882 | */ |
883 | int |
884 | msdosfs_unmount(struct mount *mp, int mntflags) |
885 | { |
886 | struct msdosfsmount *pmp; |
887 | int error, flags; |
888 | |
889 | flags = 0; |
890 | if (mntflags & MNT_FORCE) |
891 | flags |= FORCECLOSE; |
892 | if ((error = vflush(mp, NULLVP, flags)) != 0) |
893 | return (error); |
894 | pmp = VFSTOMSDOSFS(mp); |
895 | if (pmp->pm_devvp->v_type != VBAD) |
896 | spec_node_setmountedfs(pmp->pm_devvp, NULL); |
897 | #ifdef MSDOSFS_DEBUG |
898 | { |
899 | struct vnode *vp = pmp->pm_devvp; |
900 | |
901 | printf("msdosfs_umount(): just before calling VOP_CLOSE()\n" ); |
902 | printf("flag %08x, usecount %d, writecount %d, holdcnt %d\n" , |
903 | vp->v_vflag | vp->v_iflag | vp->v_uflag, vp->v_usecount, |
904 | vp->v_writecount, vp->v_holdcnt); |
905 | printf("mount %p, op %p\n" , |
906 | vp->v_mount, vp->v_op); |
907 | printf("freef %p, freeb %p, mount %p\n" , |
908 | vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev, |
909 | vp->v_mount); |
910 | printf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n" , |
911 | vp->v_cleanblkhd.lh_first, |
912 | vp->v_dirtyblkhd.lh_first, |
913 | vp->v_numoutput, vp->v_type); |
914 | printf("union %p, tag %d, data[0] %08x, data[1] %08x\n" , |
915 | vp->v_socket, vp->v_tag, |
916 | ((u_int *)vp->v_data)[0], |
917 | ((u_int *)vp->v_data)[1]); |
918 | } |
919 | #endif |
920 | vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); |
921 | (void) VOP_CLOSE(pmp->pm_devvp, |
922 | pmp->pm_flags & MSDOSFSMNT_RONLY ? FREAD : FREAD|FWRITE, NOCRED); |
923 | vput(pmp->pm_devvp); |
924 | msdosfs_fh_destroy(pmp); |
925 | free(pmp->pm_inusemap, M_MSDOSFSFAT); |
926 | free(pmp, M_MSDOSFSMNT); |
927 | mp->mnt_data = NULL; |
928 | mp->mnt_flag &= ~MNT_LOCAL; |
929 | fstrans_unmount(mp); |
930 | return (0); |
931 | } |
932 | |
933 | int |
934 | msdosfs_root(struct mount *mp, struct vnode **vpp) |
935 | { |
936 | struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); |
937 | int error; |
938 | |
939 | #ifdef MSDOSFS_DEBUG |
940 | printf("msdosfs_root(); mp %p, pmp %p\n" , mp, pmp); |
941 | #endif |
942 | if ((error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, vpp)) != 0) |
943 | return error; |
944 | error = vn_lock(*vpp, LK_EXCLUSIVE); |
945 | if (error) { |
946 | vrele(*vpp); |
947 | *vpp = NULL; |
948 | return error; |
949 | } |
950 | return 0; |
951 | } |
952 | |
953 | int |
954 | msdosfs_statvfs(struct mount *mp, struct statvfs *sbp) |
955 | { |
956 | struct msdosfsmount *pmp; |
957 | |
958 | pmp = VFSTOMSDOSFS(mp); |
959 | sbp->f_bsize = pmp->pm_bpcluster; |
960 | sbp->f_frsize = sbp->f_bsize; |
961 | sbp->f_iosize = pmp->pm_bpcluster; |
962 | sbp->f_blocks = pmp->pm_nmbrofclusters; |
963 | sbp->f_bfree = pmp->pm_freeclustercount; |
964 | sbp->f_bavail = pmp->pm_freeclustercount; |
965 | sbp->f_bresvd = 0; |
966 | sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ |
967 | sbp->f_ffree = 0; /* what to put in here? */ |
968 | sbp->f_favail = 0; /* what to put in here? */ |
969 | sbp->f_fresvd = 0; |
970 | copy_statvfs_info(sbp, mp); |
971 | return (0); |
972 | } |
973 | |
974 | struct msdosfs_sync_ctx { |
975 | int waitfor; |
976 | }; |
977 | |
978 | static bool |
979 | msdosfs_sync_selector(void *cl, struct vnode *vp) |
980 | { |
981 | struct msdosfs_sync_ctx *c = cl; |
982 | struct denode *dep; |
983 | |
984 | dep = VTODE(vp); |
985 | if (c->waitfor == MNT_LAZY || vp->v_type == VNON || |
986 | dep == NULL || (((dep->de_flag & |
987 | (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0) && |
988 | (LIST_EMPTY(&vp->v_dirtyblkhd) && |
989 | UVM_OBJ_IS_CLEAN(&vp->v_uobj)))) |
990 | return false; |
991 | return true; |
992 | } |
993 | |
994 | int |
995 | msdosfs_sync(struct mount *mp, int waitfor, kauth_cred_t cred) |
996 | { |
997 | struct vnode *vp; |
998 | struct vnode_iterator *marker; |
999 | struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); |
1000 | int error, allerror = 0; |
1001 | struct msdosfs_sync_ctx ctx; |
1002 | |
1003 | /* |
1004 | * If we ever switch to not updating all of the FATs all the time, |
1005 | * this would be the place to update them from the first one. |
1006 | */ |
1007 | if (pmp->pm_fmod != 0) { |
1008 | if (pmp->pm_flags & MSDOSFSMNT_RONLY) |
1009 | panic("msdosfs_sync: rofs mod" ); |
1010 | else { |
1011 | /* update FATs here */ |
1012 | } |
1013 | } |
1014 | fstrans_start(mp, FSTRANS_SHARED); |
1015 | /* |
1016 | * Write back each (modified) denode. |
1017 | */ |
1018 | vfs_vnode_iterator_init(mp, &marker); |
1019 | ctx.waitfor = waitfor; |
1020 | while ((vp = vfs_vnode_iterator_next(marker, msdosfs_sync_selector, |
1021 | &ctx))) |
1022 | { |
1023 | error = vn_lock(vp, LK_EXCLUSIVE); |
1024 | if (error) { |
1025 | vrele(vp); |
1026 | continue; |
1027 | } |
1028 | if ((error = VOP_FSYNC(vp, cred, |
1029 | waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0)) != 0) |
1030 | allerror = error; |
1031 | vput(vp); |
1032 | } |
1033 | vfs_vnode_iterator_destroy(marker); |
1034 | |
1035 | /* |
1036 | * Force stale file system control information to be flushed. |
1037 | */ |
1038 | if ((error = VOP_FSYNC(pmp->pm_devvp, cred, |
1039 | waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0)) != 0) |
1040 | allerror = error; |
1041 | fstrans_done(mp); |
1042 | return (allerror); |
1043 | } |
1044 | |
1045 | int |
1046 | msdosfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) |
1047 | { |
1048 | struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); |
1049 | struct defid defh; |
1050 | uint32_t gen; |
1051 | int error; |
1052 | |
1053 | if (fhp->fid_len != sizeof(struct defid)) { |
1054 | DPRINTF("fid_len %d %zd" , fhp->fid_len, sizeof(struct defid)); |
1055 | return EINVAL; |
1056 | } |
1057 | memcpy(&defh, fhp, sizeof(defh)); |
1058 | error = msdosfs_fh_lookup(pmp, defh.defid_dirclust, defh.defid_dirofs, |
1059 | &gen); |
1060 | if (error == 0 && gen != defh.defid_gen) |
1061 | error = ESTALE; |
1062 | if (error) { |
1063 | *vpp = NULLVP; |
1064 | return error; |
1065 | } |
1066 | error = deget(pmp, defh.defid_dirclust, defh.defid_dirofs, vpp); |
1067 | if (error) { |
1068 | DPRINTF("deget %d" , error); |
1069 | *vpp = NULLVP; |
1070 | return error; |
1071 | } |
1072 | error = vn_lock(*vpp, LK_EXCLUSIVE); |
1073 | if (error) { |
1074 | vrele(*vpp); |
1075 | *vpp = NULLVP; |
1076 | return error; |
1077 | } |
1078 | return 0; |
1079 | } |
1080 | |
1081 | int |
1082 | msdosfs_vptofh(struct vnode *vp, struct fid *fhp, size_t *fh_size) |
1083 | { |
1084 | struct msdosfsmount *pmp = VFSTOMSDOSFS(vp->v_mount); |
1085 | struct denode *dep; |
1086 | struct defid defh; |
1087 | int error; |
1088 | |
1089 | if (*fh_size < sizeof(struct defid)) { |
1090 | *fh_size = sizeof(struct defid); |
1091 | return E2BIG; |
1092 | } |
1093 | *fh_size = sizeof(struct defid); |
1094 | dep = VTODE(vp); |
1095 | memset(&defh, 0, sizeof(defh)); |
1096 | defh.defid_len = sizeof(struct defid); |
1097 | defh.defid_dirclust = dep->de_dirclust; |
1098 | defh.defid_dirofs = dep->de_diroffset; |
1099 | error = msdosfs_fh_enter(pmp, dep->de_dirclust, dep->de_diroffset, |
1100 | &defh.defid_gen); |
1101 | if (error == 0) |
1102 | memcpy(fhp, &defh, sizeof(defh)); |
1103 | return error; |
1104 | } |
1105 | |
1106 | int |
1107 | msdosfs_vget(struct mount *mp, ino_t ino, |
1108 | struct vnode **vpp) |
1109 | { |
1110 | |
1111 | return (EOPNOTSUPP); |
1112 | } |
1113 | |
1114 | int |
1115 | msdosfs_suspendctl(struct mount *mp, int cmd) |
1116 | { |
1117 | int error; |
1118 | struct lwp *l = curlwp; |
1119 | |
1120 | switch (cmd) { |
1121 | case SUSPEND_SUSPEND: |
1122 | if ((error = fstrans_setstate(mp, FSTRANS_SUSPENDING)) != 0) |
1123 | return error; |
1124 | error = msdosfs_sync(mp, MNT_WAIT, l->l_proc->p_cred); |
1125 | if (error == 0) |
1126 | error = fstrans_setstate(mp, FSTRANS_SUSPENDED); |
1127 | if (error != 0) { |
1128 | (void) fstrans_setstate(mp, FSTRANS_NORMAL); |
1129 | return error; |
1130 | } |
1131 | return 0; |
1132 | |
1133 | case SUSPEND_RESUME: |
1134 | return fstrans_setstate(mp, FSTRANS_NORMAL); |
1135 | |
1136 | default: |
1137 | return EINVAL; |
1138 | } |
1139 | } |
1140 | |