| 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 | |