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sys/fs/msdosfs/msdosfs_vfsops.c
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1 /* $FreeBSD$ */ 2 /* $NetBSD: msdosfs_vfsops.c,v 1.51 1997/11/17 15:36:58 ws Exp $ */ 3 4 /*- 5 * SPDX-License-Identifier: BSD-4-Clause 6 * 7 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. 8 * Copyright (C) 1994, 1995, 1997 TooLs GmbH. 9 * All rights reserved. 10 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by TooLs GmbH. 23 * 4. The name of TooLs GmbH may not be used to endorse or promote products 24 * derived from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 27 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 28 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 29 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 31 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 32 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 33 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 34 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 35 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 36 */ 37 /*- 38 * Written by Paul Popelka (paulp@uts.amdahl.com) 39 * 40 * You can do anything you want with this software, just don't say you wrote 41 * it, and don't remove this notice. 42 * 43 * This software is provided "as is". 44 * 45 * The author supplies this software to be publicly redistributed on the 46 * understanding that the author is not responsible for the correct 47 * functioning of this software in any circumstances and is not liable for 48 * any damages caused by this software. 49 * 50 * October 1992 51 */ 52 53 #include <sys/param.h> 54 #include <sys/systm.h> 55 #include <sys/buf.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/stat.h> 68 #include <sys/vnode.h> 69 70 #include <geom/geom.h> 71 #include <geom/geom_vfs.h> 72 73 #include <fs/msdosfs/bootsect.h> 74 #include <fs/msdosfs/bpb.h> 75 #include <fs/msdosfs/direntry.h> 76 #include <fs/msdosfs/denode.h> 77 #include <fs/msdosfs/fat.h> 78 #include <fs/msdosfs/msdosfsmount.h> 79 80 #ifdef MSDOSFS_DEBUG 81 #include <sys/rwlock.h> 82 #endif 83 84 static const char msdosfs_lock_msg[] = "fatlk"; 85 86 /* Mount options that we support. */ 87 static const char *msdosfs_opts[] = { 88 "async", "noatime", "noclusterr", "noclusterw", 89 "export", "force", "from", "sync", 90 "cs_dos", "cs_local", "cs_win", "dirmask", 91 "gid", "kiconv", "longname", 92 "longnames", "mask", "shortname", "shortnames", 93 "uid", "win95", "nowin95", 94 NULL 95 }; 96 97 #if 1 /*def PC98*/ 98 /* 99 * XXX - The boot signature formatted by NEC PC-98 DOS looks like a 100 * garbage or a random value :-{ 101 * If you want to use that broken-signatured media, define the 102 * following symbol even though PC/AT. 103 * (ex. mount PC-98 DOS formatted FD on PC/AT) 104 */ 105 #define MSDOSFS_NOCHECKSIG 106 #endif 107 108 MALLOC_DEFINE(M_MSDOSFSMNT, "msdosfs_mount", "MSDOSFS mount structure"); 109 static MALLOC_DEFINE(M_MSDOSFSFAT, "msdosfs_fat", "MSDOSFS file allocation table"); 110 111 struct iconv_functions *msdosfs_iconv; 112 113 static int update_mp(struct mount *mp, struct thread *td); 114 static int mountmsdosfs(struct vnode *devvp, struct mount *mp); 115 static vfs_fhtovp_t msdosfs_fhtovp; 116 static vfs_mount_t msdosfs_mount; 117 static vfs_root_t msdosfs_root; 118 static vfs_statfs_t msdosfs_statfs; 119 static vfs_sync_t msdosfs_sync; 120 static vfs_unmount_t msdosfs_unmount; 121 122 /* Maximum length of a character set name (arbitrary). */ 123 #define MAXCSLEN 64 124 125 static int 126 update_mp(struct mount *mp, struct thread *td) 127 { 128 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 129 void *dos, *win, *local; 130 int error, v; 131 132 if (!vfs_getopt(mp->mnt_optnew, "kiconv", NULL, NULL)) { 133 if (msdosfs_iconv != NULL) { 134 error = vfs_getopt(mp->mnt_optnew, 135 "cs_win", &win, NULL); 136 if (!error) 137 error = vfs_getopt(mp->mnt_optnew, 138 "cs_local", &local, NULL); 139 if (!error) 140 error = vfs_getopt(mp->mnt_optnew, 141 "cs_dos", &dos, NULL); 142 if (!error) { 143 msdosfs_iconv->open(win, local, &pmp->pm_u2w); 144 msdosfs_iconv->open(local, win, &pmp->pm_w2u); 145 msdosfs_iconv->open(dos, local, &pmp->pm_u2d); 146 msdosfs_iconv->open(local, dos, &pmp->pm_d2u); 147 } 148 if (error != 0) 149 return (error); 150 } else { 151 pmp->pm_w2u = NULL; 152 pmp->pm_u2w = NULL; 153 pmp->pm_d2u = NULL; 154 pmp->pm_u2d = NULL; 155 } 156 } 157 158 if (vfs_scanopt(mp->mnt_optnew, "gid", "%d", &v) == 1) 159 pmp->pm_gid = v; 160 if (vfs_scanopt(mp->mnt_optnew, "uid", "%d", &v) == 1) 161 pmp->pm_uid = v; 162 if (vfs_scanopt(mp->mnt_optnew, "mask", "%d", &v) == 1) 163 pmp->pm_mask = v & ALLPERMS; 164 if (vfs_scanopt(mp->mnt_optnew, "dirmask", "%d", &v) == 1) 165 pmp->pm_dirmask = v & ALLPERMS; 166 vfs_flagopt(mp->mnt_optnew, "shortname", 167 &pmp->pm_flags, MSDOSFSMNT_SHORTNAME); 168 vfs_flagopt(mp->mnt_optnew, "shortnames", 169 &pmp->pm_flags, MSDOSFSMNT_SHORTNAME); 170 vfs_flagopt(mp->mnt_optnew, "longname", 171 &pmp->pm_flags, MSDOSFSMNT_LONGNAME); 172 vfs_flagopt(mp->mnt_optnew, "longnames", 173 &pmp->pm_flags, MSDOSFSMNT_LONGNAME); 174 vfs_flagopt(mp->mnt_optnew, "kiconv", 175 &pmp->pm_flags, MSDOSFSMNT_KICONV); 176 177 if (vfs_getopt(mp->mnt_optnew, "nowin95", NULL, NULL) == 0) 178 pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 179 else 180 pmp->pm_flags &= ~MSDOSFSMNT_NOWIN95; 181 182 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 183 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 184 else 185 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 186 return 0; 187 } 188 189 static int 190 msdosfs_cmount(struct mntarg *ma, void *data, uint64_t flags) 191 { 192 struct msdosfs_args args; 193 struct export_args exp; 194 int error; 195 196 if (data == NULL) 197 return (EINVAL); 198 error = copyin(data, &args, sizeof args); 199 if (error) 200 return (error); 201 vfs_oexport_conv(&args.export, &exp); 202 203 ma = mount_argsu(ma, "from", args.fspec, MAXPATHLEN); 204 ma = mount_arg(ma, "export", &exp, sizeof(exp)); 205 ma = mount_argf(ma, "uid", "%d", args.uid); 206 ma = mount_argf(ma, "gid", "%d", args.gid); 207 ma = mount_argf(ma, "mask", "%d", args.mask); 208 ma = mount_argf(ma, "dirmask", "%d", args.dirmask); 209 210 ma = mount_argb(ma, args.flags & MSDOSFSMNT_SHORTNAME, "noshortname"); 211 ma = mount_argb(ma, args.flags & MSDOSFSMNT_LONGNAME, "nolongname"); 212 ma = mount_argb(ma, !(args.flags & MSDOSFSMNT_NOWIN95), "nowin95"); 213 ma = mount_argb(ma, args.flags & MSDOSFSMNT_KICONV, "nokiconv"); 214 215 ma = mount_argsu(ma, "cs_win", args.cs_win, MAXCSLEN); 216 ma = mount_argsu(ma, "cs_dos", args.cs_dos, MAXCSLEN); 217 ma = mount_argsu(ma, "cs_local", args.cs_local, MAXCSLEN); 218 219 error = kernel_mount(ma, flags); 220 221 return (error); 222 } 223 224 /* 225 * mp - path - addr in user space of mount point (ie /usr or whatever) 226 * data - addr in user space of mount params including the name of the block 227 * special file to treat as a filesystem. 228 */ 229 static int 230 msdosfs_mount(struct mount *mp) 231 { 232 struct vnode *devvp; /* vnode for blk device to mount */ 233 struct thread *td; 234 /* msdosfs specific mount control block */ 235 struct msdosfsmount *pmp = NULL; 236 struct nameidata ndp; 237 int error, flags; 238 accmode_t accmode; 239 char *from; 240 241 td = curthread; 242 if (vfs_filteropt(mp->mnt_optnew, msdosfs_opts)) 243 return (EINVAL); 244 245 /* 246 * If updating, check whether changing from read-only to 247 * read/write; if there is no device name, that's all we do. 248 */ 249 if (mp->mnt_flag & MNT_UPDATE) { 250 pmp = VFSTOMSDOSFS(mp); 251 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && 252 vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0)) { 253 if ((error = vn_start_write(NULL, &mp, V_WAIT)) != 0) 254 return (error); 255 error = vfs_write_suspend_umnt(mp); 256 if (error != 0) 257 return (error); 258 259 flags = WRITECLOSE; 260 if (mp->mnt_flag & MNT_FORCE) 261 flags |= FORCECLOSE; 262 error = vflush(mp, 0, flags, td); 263 if (error != 0) { 264 vfs_write_resume(mp, 0); 265 return (error); 266 } 267 268 /* 269 * Now the volume is clean. Mark it so while the 270 * device is still rw. 271 */ 272 error = markvoldirty(pmp, 0); 273 if (error != 0) { 274 vfs_write_resume(mp, 0); 275 (void)markvoldirty(pmp, 1); 276 return (error); 277 } 278 279 /* Downgrade the device from rw to ro. */ 280 g_topology_lock(); 281 error = g_access(pmp->pm_cp, 0, -1, 0); 282 g_topology_unlock(); 283 if (error) { 284 vfs_write_resume(mp, 0); 285 (void)markvoldirty(pmp, 1); 286 return (error); 287 } 288 289 /* 290 * Backing out after an error was painful in the 291 * above. Now we are committed to succeeding. 292 */ 293 pmp->pm_fmod = 0; 294 pmp->pm_flags |= MSDOSFSMNT_RONLY; 295 MNT_ILOCK(mp); 296 mp->mnt_flag |= MNT_RDONLY; 297 MNT_IUNLOCK(mp); 298 vfs_write_resume(mp, 0); 299 } else if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && 300 !vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0)) { 301 /* 302 * If upgrade to read-write by non-root, then verify 303 * that user has necessary permissions on the device. 304 */ 305 devvp = pmp->pm_devvp; 306 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 307 error = VOP_ACCESS(devvp, VREAD | VWRITE, 308 td->td_ucred, td); 309 if (error) 310 error = priv_check(td, PRIV_VFS_MOUNT_PERM); 311 if (error) { 312 VOP_UNLOCK(devvp, 0); 313 return (error); 314 } 315 VOP_UNLOCK(devvp, 0); 316 g_topology_lock(); 317 error = g_access(pmp->pm_cp, 0, 1, 0); 318 g_topology_unlock(); 319 if (error) 320 return (error); 321 322 pmp->pm_fmod = 1; 323 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 324 MNT_ILOCK(mp); 325 mp->mnt_flag &= ~MNT_RDONLY; 326 MNT_IUNLOCK(mp); 327 328 /* Now that the volume is modifiable, mark it dirty. */ 329 error = markvoldirty(pmp, 1); 330 if (error) 331 return (error); 332 } 333 } 334 /* 335 * Not an update, or updating the name: look up the name 336 * and verify that it refers to a sensible disk device. 337 */ 338 if (vfs_getopt(mp->mnt_optnew, "from", (void **)&from, NULL)) 339 return (EINVAL); 340 NDINIT(&ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, from, td); 341 error = namei(&ndp); 342 if (error) 343 return (error); 344 devvp = ndp.ni_vp; 345 NDFREE(&ndp, NDF_ONLY_PNBUF); 346 347 if (!vn_isdisk(devvp, &error)) { 348 vput(devvp); 349 return (error); 350 } 351 /* 352 * If mount by non-root, then verify that user has necessary 353 * permissions on the device. 354 */ 355 accmode = VREAD; 356 if ((mp->mnt_flag & MNT_RDONLY) == 0) 357 accmode |= VWRITE; 358 error = VOP_ACCESS(devvp, accmode, td->td_ucred, td); 359 if (error) 360 error = priv_check(td, PRIV_VFS_MOUNT_PERM); 361 if (error) { 362 vput(devvp); 363 return (error); 364 } 365 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 366 error = mountmsdosfs(devvp, mp); 367 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 368 pmp = VFSTOMSDOSFS(mp); 369 #endif 370 } else { 371 vput(devvp); 372 if (devvp != pmp->pm_devvp) 373 return (EINVAL); /* XXX needs translation */ 374 } 375 if (error) { 376 vrele(devvp); 377 return (error); 378 } 379 380 error = update_mp(mp, td); 381 if (error) { 382 if ((mp->mnt_flag & MNT_UPDATE) == 0) 383 msdosfs_unmount(mp, MNT_FORCE); 384 return error; 385 } 386 387 vfs_mountedfrom(mp, from); 388 #ifdef MSDOSFS_DEBUG 389 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 390 #endif 391 return (0); 392 } 393 394 static int 395 mountmsdosfs(struct vnode *devvp, struct mount *mp) 396 { 397 struct msdosfsmount *pmp; 398 struct buf *bp; 399 struct cdev *dev; 400 union bootsector *bsp; 401 struct byte_bpb33 *b33; 402 struct byte_bpb50 *b50; 403 struct byte_bpb710 *b710; 404 uint8_t SecPerClust; 405 u_long clusters; 406 int ronly, error; 407 struct g_consumer *cp; 408 struct bufobj *bo; 409 410 bp = NULL; /* This and pmp both used in error_exit. */ 411 pmp = NULL; 412 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 413 414 dev = devvp->v_rdev; 415 if (atomic_cmpset_acq_ptr((uintptr_t *)&dev->si_mountpt, 0, 416 (uintptr_t)mp) == 0) { 417 VOP_UNLOCK(devvp, 0); 418 return (EBUSY); 419 } 420 g_topology_lock(); 421 error = g_vfs_open(devvp, &cp, "msdosfs", ronly ? 0 : 1); 422 g_topology_unlock(); 423 if (error != 0) { 424 atomic_store_rel_ptr((uintptr_t *)&dev->si_mountpt, 0); 425 VOP_UNLOCK(devvp, 0); 426 return (error); 427 } 428 dev_ref(dev); 429 VOP_UNLOCK(devvp, 0); 430 431 bo = &devvp->v_bufobj; 432 433 /* 434 * Read the boot sector of the filesystem, and then check the 435 * boot signature. If not a dos boot sector then error out. 436 * 437 * NOTE: 8192 is a magic size that works for ffs. 438 */ 439 error = bread(devvp, 0, 8192, NOCRED, &bp); 440 if (error) 441 goto error_exit; 442 bp->b_flags |= B_AGE; 443 bsp = (union bootsector *)bp->b_data; 444 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 445 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 446 b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB; 447 448 #ifndef MSDOSFS_NOCHECKSIG 449 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 450 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 451 error = EINVAL; 452 goto error_exit; 453 } 454 #endif 455 456 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK | M_ZERO); 457 pmp->pm_mountp = mp; 458 pmp->pm_cp = cp; 459 pmp->pm_bo = bo; 460 461 lockinit(&pmp->pm_fatlock, 0, msdosfs_lock_msg, 0, 0); 462 463 /* 464 * Initialize ownerships and permissions, since nothing else will 465 * initialize them iff we are mounting root. 466 */ 467 pmp->pm_uid = UID_ROOT; 468 pmp->pm_gid = GID_WHEEL; 469 pmp->pm_mask = pmp->pm_dirmask = S_IXUSR | S_IXGRP | S_IXOTH | 470 S_IRUSR | S_IRGRP | S_IROTH | S_IWUSR; 471 472 /* 473 * Compute several useful quantities from the bpb in the 474 * bootsector. Copy in the dos 5 variant of the bpb then fix up 475 * the fields that are different between dos 5 and dos 3.3. 476 */ 477 SecPerClust = b50->bpbSecPerClust; 478 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 479 if (pmp->pm_BytesPerSec < DEV_BSIZE) { 480 error = EINVAL; 481 goto error_exit; 482 } 483 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 484 pmp->pm_FATs = b50->bpbFATs; 485 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 486 pmp->pm_Sectors = getushort(b50->bpbSectors); 487 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 488 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 489 pmp->pm_Heads = getushort(b50->bpbHeads); 490 pmp->pm_Media = b50->bpbMedia; 491 492 /* calculate the ratio of sector size to DEV_BSIZE */ 493 pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE; 494 495 /* 496 * We don't check pm_Heads nor pm_SecPerTrack, because 497 * these may not be set for EFI file systems. We don't 498 * use these anyway, so we're unaffected if they are 499 * invalid. 500 */ 501 if (!pmp->pm_BytesPerSec || !SecPerClust) { 502 error = EINVAL; 503 goto error_exit; 504 } 505 506 if (pmp->pm_Sectors == 0) { 507 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 508 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 509 } else { 510 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 511 pmp->pm_HugeSectors = pmp->pm_Sectors; 512 } 513 514 if (pmp->pm_RootDirEnts == 0) { 515 if (pmp->pm_FATsecs 516 || getushort(b710->bpbFSVers)) { 517 error = EINVAL; 518 #ifdef MSDOSFS_DEBUG 519 printf("mountmsdosfs(): bad FAT32 filesystem\n"); 520 #endif 521 goto error_exit; 522 } 523 pmp->pm_fatmask = FAT32_MASK; 524 pmp->pm_fatmult = 4; 525 pmp->pm_fatdiv = 1; 526 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 527 if (getushort(b710->bpbExtFlags) & FATMIRROR) 528 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 529 else 530 pmp->pm_flags |= MSDOSFS_FATMIRROR; 531 } else 532 pmp->pm_flags |= MSDOSFS_FATMIRROR; 533 534 /* 535 * Check a few values (could do some more): 536 * - logical sector size: power of 2, >= block size 537 * - sectors per cluster: power of 2, >= 1 538 * - number of sectors: >= 1, <= size of partition 539 * - number of FAT sectors: >= 1 540 */ 541 if ( (SecPerClust == 0) 542 || (SecPerClust & (SecPerClust - 1)) 543 || (pmp->pm_BytesPerSec < DEV_BSIZE) 544 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 545 || (pmp->pm_HugeSectors == 0) 546 || (pmp->pm_FATsecs == 0) 547 || (SecPerClust * pmp->pm_BlkPerSec > MAXBSIZE / DEV_BSIZE) 548 ) { 549 error = EINVAL; 550 goto error_exit; 551 } 552 553 pmp->pm_HugeSectors *= pmp->pm_BlkPerSec; 554 pmp->pm_HiddenSects *= pmp->pm_BlkPerSec; /* XXX not used? */ 555 pmp->pm_FATsecs *= pmp->pm_BlkPerSec; 556 SecPerClust *= pmp->pm_BlkPerSec; 557 558 pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec; 559 560 if (FAT32(pmp)) { 561 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 562 pmp->pm_firstcluster = pmp->pm_fatblk 563 + (pmp->pm_FATs * pmp->pm_FATsecs); 564 pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec; 565 } else { 566 pmp->pm_rootdirblk = pmp->pm_fatblk + 567 (pmp->pm_FATs * pmp->pm_FATsecs); 568 pmp->pm_rootdirsize = howmany(pmp->pm_RootDirEnts * 569 sizeof(struct direntry), DEV_BSIZE); /* in blocks */ 570 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 571 } 572 573 pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 574 SecPerClust + 1; 575 pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE; /* XXX not used? */ 576 577 if (pmp->pm_fatmask == 0) { 578 if (pmp->pm_maxcluster 579 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 580 /* 581 * This will usually be a floppy disk. This size makes 582 * sure that one FAT entry will not be split across 583 * multiple blocks. 584 */ 585 pmp->pm_fatmask = FAT12_MASK; 586 pmp->pm_fatmult = 3; 587 pmp->pm_fatdiv = 2; 588 } else { 589 pmp->pm_fatmask = FAT16_MASK; 590 pmp->pm_fatmult = 2; 591 pmp->pm_fatdiv = 1; 592 } 593 } 594 595 clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv; 596 if (pmp->pm_maxcluster >= clusters) { 597 #ifdef MSDOSFS_DEBUG 598 printf("Warning: number of clusters (%ld) exceeds FAT " 599 "capacity (%ld)\n", pmp->pm_maxcluster + 1, clusters); 600 #endif 601 pmp->pm_maxcluster = clusters - 1; 602 } 603 604 if (FAT12(pmp)) 605 pmp->pm_fatblocksize = 3 * 512; 606 else 607 pmp->pm_fatblocksize = PAGE_SIZE; 608 pmp->pm_fatblocksize = roundup(pmp->pm_fatblocksize, 609 pmp->pm_BytesPerSec); 610 pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE; 611 pmp->pm_bnshift = ffs(DEV_BSIZE) - 1; 612 613 /* 614 * Compute mask and shift value for isolating cluster relative byte 615 * offsets and cluster numbers from a file offset. 616 */ 617 pmp->pm_bpcluster = SecPerClust * DEV_BSIZE; 618 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 619 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 620 621 /* 622 * Check for valid cluster size 623 * must be a power of 2 624 */ 625 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 626 error = EINVAL; 627 goto error_exit; 628 } 629 630 /* 631 * Release the bootsector buffer. 632 */ 633 brelse(bp); 634 bp = NULL; 635 636 /* 637 * Check the fsinfo sector if we have one. Silently fix up our 638 * in-core copy of fp->fsinxtfree if it is unknown (0xffffffff) 639 * or too large. Ignore fp->fsinfree for now, since we need to 640 * read the entire FAT anyway to fill the inuse map. 641 */ 642 if (pmp->pm_fsinfo) { 643 struct fsinfo *fp; 644 645 if ((error = bread(devvp, pmp->pm_fsinfo, pmp->pm_BytesPerSec, 646 NOCRED, &bp)) != 0) 647 goto error_exit; 648 fp = (struct fsinfo *)bp->b_data; 649 if (!bcmp(fp->fsisig1, "RRaA", 4) 650 && !bcmp(fp->fsisig2, "rrAa", 4) 651 && !bcmp(fp->fsisig3, "\0\0\125\252", 4)) { 652 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 653 if (pmp->pm_nxtfree > pmp->pm_maxcluster) 654 pmp->pm_nxtfree = CLUST_FIRST; 655 } else 656 pmp->pm_fsinfo = 0; 657 brelse(bp); 658 bp = NULL; 659 } 660 661 /* 662 * Finish initializing pmp->pm_nxtfree (just in case the first few 663 * sectors aren't properly reserved in the FAT). This completes 664 * the fixup for fp->fsinxtfree, and fixes up the zero-initialized 665 * value if there is no fsinfo. We will use pmp->pm_nxtfree 666 * internally even if there is no fsinfo. 667 */ 668 if (pmp->pm_nxtfree < CLUST_FIRST) 669 pmp->pm_nxtfree = CLUST_FIRST; 670 671 /* 672 * Allocate memory for the bitmap of allocated clusters, and then 673 * fill it in. 674 */ 675 pmp->pm_inusemap = malloc(howmany(pmp->pm_maxcluster + 1, N_INUSEBITS) 676 * sizeof(*pmp->pm_inusemap), 677 M_MSDOSFSFAT, M_WAITOK); 678 679 /* 680 * fillinusemap() needs pm_devvp. 681 */ 682 pmp->pm_devvp = devvp; 683 pmp->pm_dev = dev; 684 685 /* 686 * Have the inuse map filled in. 687 */ 688 MSDOSFS_LOCK_MP(pmp); 689 error = fillinusemap(pmp); 690 MSDOSFS_UNLOCK_MP(pmp); 691 if (error != 0) 692 goto error_exit; 693 694 /* 695 * If they want FAT updates to be synchronous then let them suffer 696 * the performance degradation in exchange for the on disk copy of 697 * the FAT being correct just about all the time. I suppose this 698 * would be a good thing to turn on if the kernel is still flakey. 699 */ 700 if (mp->mnt_flag & MNT_SYNCHRONOUS) 701 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 702 703 /* 704 * Finish up. 705 */ 706 if (ronly) 707 pmp->pm_flags |= MSDOSFSMNT_RONLY; 708 else { 709 if ((error = markvoldirty(pmp, 1)) != 0) { 710 (void)markvoldirty(pmp, 0); 711 goto error_exit; 712 } 713 pmp->pm_fmod = 1; 714 } 715 mp->mnt_data = pmp; 716 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 717 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 718 MNT_ILOCK(mp); 719 mp->mnt_flag |= MNT_LOCAL; 720 mp->mnt_kern_flag |= MNTK_USES_BCACHE | MNTK_NO_IOPF; 721 MNT_IUNLOCK(mp); 722 723 return (0); 724 725 error_exit: 726 if (bp) 727 brelse(bp); 728 if (cp != NULL) { 729 g_topology_lock(); 730 g_vfs_close(cp); 731 g_topology_unlock(); 732 } 733 if (pmp) { 734 lockdestroy(&pmp->pm_fatlock); 735 free(pmp->pm_inusemap, M_MSDOSFSFAT); 736 free(pmp, M_MSDOSFSMNT); 737 mp->mnt_data = NULL; 738 } 739 atomic_store_rel_ptr((uintptr_t *)&dev->si_mountpt, 0); 740 dev_rel(dev); 741 return (error); 742 } 743 744 /* 745 * Unmount the filesystem described by mp. 746 */ 747 static int 748 msdosfs_unmount(struct mount *mp, int mntflags) 749 { 750 struct msdosfsmount *pmp; 751 int error, flags; 752 bool susp; 753 754 error = flags = 0; 755 pmp = VFSTOMSDOSFS(mp); 756 susp = (pmp->pm_flags & MSDOSFSMNT_RONLY) == 0; 757 758 if (susp) { 759 error = vfs_write_suspend_umnt(mp); 760 if (error != 0) 761 return (error); 762 } 763 764 if ((mntflags & MNT_FORCE) != 0) 765 flags |= FORCECLOSE; 766 error = vflush(mp, 0, flags, curthread); 767 if (error != 0 && error != ENXIO) { 768 if (susp) 769 vfs_write_resume(mp, VR_START_WRITE); 770 return (error); 771 } 772 if (susp) { 773 error = markvoldirty(pmp, 0); 774 if (error != 0 && error != ENXIO) { 775 if (susp) 776 vfs_write_resume(mp, VR_START_WRITE); 777 (void)markvoldirty(pmp, 1); 778 return (error); 779 } 780 } 781 if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) { 782 if (pmp->pm_w2u) 783 msdosfs_iconv->close(pmp->pm_w2u); 784 if (pmp->pm_u2w) 785 msdosfs_iconv->close(pmp->pm_u2w); 786 if (pmp->pm_d2u) 787 msdosfs_iconv->close(pmp->pm_d2u); 788 if (pmp->pm_u2d) 789 msdosfs_iconv->close(pmp->pm_u2d); 790 } 791 792 #ifdef MSDOSFS_DEBUG 793 { 794 struct vnode *vp = pmp->pm_devvp; 795 struct bufobj *bo; 796 797 bo = &vp->v_bufobj; 798 BO_LOCK(bo); 799 VI_LOCK(vp); 800 vn_printf(vp, 801 "msdosfs_umount(): just before calling VOP_CLOSE()\n"); 802 printf("freef %p, freeb %p, mount %p\n", 803 TAILQ_NEXT(vp, v_actfreelist), vp->v_actfreelist.tqe_prev, 804 vp->v_mount); 805 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %ld, type %d\n", 806 TAILQ_FIRST(&vp->v_bufobj.bo_clean.bv_hd), 807 TAILQ_FIRST(&vp->v_bufobj.bo_dirty.bv_hd), 808 vp->v_bufobj.bo_numoutput, vp->v_type); 809 VI_UNLOCK(vp); 810 BO_UNLOCK(bo); 811 } 812 #endif 813 if (susp) 814 vfs_write_resume(mp, VR_START_WRITE); 815 816 g_topology_lock(); 817 g_vfs_close(pmp->pm_cp); 818 g_topology_unlock(); 819 atomic_store_rel_ptr((uintptr_t *)&pmp->pm_dev->si_mountpt, 0); 820 vrele(pmp->pm_devvp); 821 dev_rel(pmp->pm_dev); 822 free(pmp->pm_inusemap, M_MSDOSFSFAT); 823 lockdestroy(&pmp->pm_fatlock); 824 free(pmp, M_MSDOSFSMNT); 825 mp->mnt_data = NULL; 826 MNT_ILOCK(mp); 827 mp->mnt_flag &= ~MNT_LOCAL; 828 MNT_IUNLOCK(mp); 829 return (error); 830 } 831 832 static int 833 msdosfs_root(struct mount *mp, int flags, struct vnode **vpp) 834 { 835 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 836 struct denode *ndep; 837 int error; 838 839 #ifdef MSDOSFS_DEBUG 840 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 841 #endif 842 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep); 843 if (error) 844 return (error); 845 *vpp = DETOV(ndep); 846 return (0); 847 } 848 849 static int 850 msdosfs_statfs(struct mount *mp, struct statfs *sbp) 851 { 852 struct msdosfsmount *pmp; 853 854 pmp = VFSTOMSDOSFS(mp); 855 sbp->f_bsize = pmp->pm_bpcluster; 856 sbp->f_iosize = pmp->pm_bpcluster; 857 sbp->f_blocks = pmp->pm_maxcluster + 1; 858 sbp->f_bfree = pmp->pm_freeclustercount; 859 sbp->f_bavail = pmp->pm_freeclustercount; 860 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 861 sbp->f_ffree = 0; /* what to put in here? */ 862 return (0); 863 } 864 865 /* 866 * If we have an FSInfo block, update it. 867 */ 868 static int 869 msdosfs_fsiflush(struct msdosfsmount *pmp, int waitfor) 870 { 871 struct fsinfo *fp; 872 struct buf *bp; 873 int error; 874 875 MSDOSFS_LOCK_MP(pmp); 876 if (pmp->pm_fsinfo == 0 || (pmp->pm_flags & MSDOSFS_FSIMOD) == 0) { 877 error = 0; 878 goto unlock; 879 } 880 error = bread(pmp->pm_devvp, pmp->pm_fsinfo, pmp->pm_BytesPerSec, 881 NOCRED, &bp); 882 if (error != 0) { 883 brelse(bp); 884 goto unlock; 885 } 886 fp = (struct fsinfo *)bp->b_data; 887 putulong(fp->fsinfree, pmp->pm_freeclustercount); 888 putulong(fp->fsinxtfree, pmp->pm_nxtfree); 889 pmp->pm_flags &= ~MSDOSFS_FSIMOD; 890 if (waitfor == MNT_WAIT) 891 error = bwrite(bp); 892 else 893 bawrite(bp); 894 unlock: 895 MSDOSFS_UNLOCK_MP(pmp); 896 return (error); 897 } 898 899 static int 900 msdosfs_sync(struct mount *mp, int waitfor) 901 { 902 struct vnode *vp, *nvp; 903 struct thread *td; 904 struct denode *dep; 905 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 906 int error, allerror = 0; 907 908 td = curthread; 909 910 /* 911 * If we ever switch to not updating all of the FATs all the time, 912 * this would be the place to update them from the first one. 913 */ 914 if (pmp->pm_fmod != 0) { 915 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 916 panic("msdosfs_sync: rofs mod"); 917 else { 918 /* update FATs here */ 919 } 920 } 921 /* 922 * Write back each (modified) denode. 923 */ 924 loop: 925 MNT_VNODE_FOREACH_ALL(vp, mp, nvp) { 926 if (vp->v_type == VNON) { 927 VI_UNLOCK(vp); 928 continue; 929 } 930 dep = VTODE(vp); 931 if ((dep->de_flag & 932 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 && 933 (vp->v_bufobj.bo_dirty.bv_cnt == 0 || 934 waitfor == MNT_LAZY)) { 935 VI_UNLOCK(vp); 936 continue; 937 } 938 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td); 939 if (error) { 940 if (error == ENOENT) 941 goto loop; 942 continue; 943 } 944 error = VOP_FSYNC(vp, waitfor, td); 945 if (error) 946 allerror = error; 947 VOP_UNLOCK(vp, 0); 948 vrele(vp); 949 } 950 951 /* 952 * Flush filesystem control info. 953 */ 954 if (waitfor != MNT_LAZY) { 955 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); 956 error = VOP_FSYNC(pmp->pm_devvp, waitfor, td); 957 if (error) 958 allerror = error; 959 VOP_UNLOCK(pmp->pm_devvp, 0); 960 } 961 962 error = msdosfs_fsiflush(pmp, waitfor); 963 if (error != 0) 964 allerror = error; 965 966 if (allerror == 0 && waitfor == MNT_SUSPEND) { 967 MNT_ILOCK(mp); 968 mp->mnt_kern_flag |= MNTK_SUSPEND2 | MNTK_SUSPENDED; 969 MNT_IUNLOCK(mp); 970 } 971 return (allerror); 972 } 973 974 static int 975 msdosfs_fhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp) 976 { 977 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 978 struct defid *defhp = (struct defid *) fhp; 979 struct denode *dep; 980 int error; 981 982 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 983 if (error) { 984 *vpp = NULLVP; 985 return (error); 986 } 987 *vpp = DETOV(dep); 988 vnode_create_vobject(*vpp, dep->de_FileSize, curthread); 989 return (0); 990 } 991 992 static void 993 msdosfs_susp_clean(struct mount *mp __unused) 994 { 995 } 996 997 static struct vfsops msdosfs_vfsops = { 998 .vfs_fhtovp = msdosfs_fhtovp, 999 .vfs_mount = msdosfs_mount, 1000 .vfs_cmount = msdosfs_cmount, 1001 .vfs_root = msdosfs_root, 1002 .vfs_statfs = msdosfs_statfs, 1003 .vfs_sync = msdosfs_sync, 1004 .vfs_unmount = msdosfs_unmount, 1005 .vfs_susp_clean = msdosfs_susp_clean, 1006 }; 1007 1008 VFS_SET(msdosfs_vfsops, msdosfs, 0); 1009 MODULE_VERSION(msdosfs, 1);
Cache object: 72dec7ad83b6164351240b6efe398bb0
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