1 /* $FreeBSD: src/sys/msdosfs/msdosfs_vfsops.c,v 1.60.2.6 2002/09/12 21:33:38 trhodes Exp $ */ 2 /* $DragonFly: src/sys/vfs/msdosfs/msdosfs_vfsops.c,v 1.9 2003/09/23 05:03:52 dillon Exp $ */ 3 /* $NetBSD: msdosfs_vfsops.c,v 1.51 1997/11/17 15:36:58 ws Exp $ */ 4 5 /*- 6 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. 7 * Copyright (C) 1994, 1995, 1997 TooLs GmbH. 8 * All rights reserved. 9 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by TooLs GmbH. 22 * 4. The name of TooLs GmbH may not be used to endorse or promote products 23 * derived from this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 26 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 27 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 28 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 29 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 30 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 31 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 32 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 33 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 34 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 35 */ 36 /* 37 * Written by Paul Popelka (paulp@uts.amdahl.com) 38 * 39 * You can do anything you want with this software, just don't say you wrote 40 * it, and don't remove this notice. 41 * 42 * This software is provided "as is". 43 * 44 * The author supplies this software to be publicly redistributed on the 45 * understanding that the author is not responsible for the correct 46 * functioning of this software in any circumstances and is not liable for 47 * any damages caused by this software. 48 * 49 * October 1992 50 */ 51 52 #include <sys/param.h> 53 #include <sys/systm.h> 54 #include <sys/conf.h> 55 #include <sys/proc.h> 56 #include <sys/namei.h> 57 #include <sys/kernel.h> 58 #include <sys/vnode.h> 59 #include <sys/mount.h> 60 #include <sys/buf.h> 61 #include <sys/fcntl.h> 62 #include <sys/malloc.h> 63 #include <sys/stat.h> /* defines ALLPERMS */ 64 #include <vm/vm_zone.h> 65 66 #include "bpb.h" 67 #include "bootsect.h" 68 #include "direntry.h" 69 #include "denode.h" 70 #include "msdosfsmount.h" 71 #include "fat.h" 72 73 #define MSDOSFS_DFLTBSIZE 4096 74 75 #if 1 /*def PC98*/ 76 /* 77 * XXX - The boot signature formatted by NEC PC-98 DOS looks like a 78 * garbage or a random value :-{ 79 * If you want to use that broken-signatured media, define the 80 * following symbol even though PC/AT. 81 * (ex. mount PC-98 DOS formatted FD on PC/AT) 82 */ 83 #define MSDOSFS_NOCHECKSIG 84 #endif 85 86 MALLOC_DEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOSFS mount structure"); 87 static MALLOC_DEFINE(M_MSDOSFSFAT, "MSDOSFS FAT", "MSDOSFS file allocation table"); 88 89 static int update_mp (struct mount *mp, struct msdosfs_args *argp); 90 static int mountmsdosfs (struct vnode *devvp, struct mount *mp, 91 struct thread *td, struct msdosfs_args *argp); 92 static int msdosfs_fhtovp (struct mount *, struct fid *, 93 struct vnode **); 94 static int msdosfs_checkexp (struct mount *, struct sockaddr *, 95 int *, struct ucred **); 96 static int msdosfs_mount (struct mount *, char *, caddr_t, 97 struct nameidata *, struct thread *); 98 static int msdosfs_root (struct mount *, struct vnode **); 99 static int msdosfs_statfs (struct mount *, struct statfs *, 100 struct thread *); 101 static int msdosfs_sync (struct mount *, int, struct thread *); 102 static int msdosfs_unmount (struct mount *, int, struct thread *); 103 static int msdosfs_vptofh (struct vnode *, struct fid *); 104 105 static int 106 update_mp(mp, argp) 107 struct mount *mp; 108 struct msdosfs_args *argp; 109 { 110 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 111 int error; 112 113 pmp->pm_gid = argp->gid; 114 pmp->pm_uid = argp->uid; 115 pmp->pm_mask = argp->mask & ALLPERMS; 116 pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT; 117 if (pmp->pm_flags & MSDOSFSMNT_U2WTABLE) { 118 bcopy(argp->u2w, pmp->pm_u2w, sizeof(pmp->pm_u2w)); 119 bcopy(argp->d2u, pmp->pm_d2u, sizeof(pmp->pm_d2u)); 120 bcopy(argp->u2d, pmp->pm_u2d, sizeof(pmp->pm_u2d)); 121 } 122 if (pmp->pm_flags & MSDOSFSMNT_ULTABLE) { 123 bcopy(argp->ul, pmp->pm_ul, sizeof(pmp->pm_ul)); 124 bcopy(argp->lu, pmp->pm_lu, sizeof(pmp->pm_lu)); 125 } 126 127 #ifndef __FreeBSD__ 128 /* 129 * GEMDOS knows nothing (yet) about win95 130 */ 131 if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS) 132 pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 133 #endif 134 135 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 136 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 137 else if (!(pmp->pm_flags & 138 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 139 struct vnode *rootvp; 140 141 /* 142 * Try to divine whether to support Win'95 long filenames 143 */ 144 if (FAT32(pmp)) 145 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 146 else { 147 if ((error = msdosfs_root(mp, &rootvp)) != 0) 148 return error; 149 pmp->pm_flags |= findwin95(VTODE(rootvp)) 150 ? MSDOSFSMNT_LONGNAME 151 : MSDOSFSMNT_SHORTNAME; 152 vput(rootvp); 153 } 154 } 155 return 0; 156 } 157 158 #ifndef __FreeBSD__ 159 int 160 msdosfs_mountroot() 161 { 162 struct mount *mp; 163 struct thread *td = curthread; /* XXX */ 164 size_t size; 165 int error; 166 struct msdosfs_args args; 167 168 if (root_device->dv_class != DV_DISK) 169 return (ENODEV); 170 171 /* 172 * Get vnodes for swapdev and rootdev. 173 */ 174 if (bdevvp(rootdev, &rootvp)) 175 panic("msdosfs_mountroot: can't setup rootvp"); 176 177 mp = malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK); 178 bzero((char *)mp, (u_long)sizeof(struct mount)); 179 mp->mnt_op = &msdosfs_vfsops; 180 mp->mnt_flag = 0; 181 TAILQ_INIT(&mp->mnt_nvnodelist); 182 TAILQ_INIT(&mp->mnt_reservedvnlist); 183 184 args.flags = 0; 185 args.uid = 0; 186 args.gid = 0; 187 args.mask = 0777; 188 189 if ((error = mountmsdosfs(rootvp, mp, p, &args)) != 0) { 190 free(mp, M_MOUNT); 191 return (error); 192 } 193 194 if ((error = update_mp(mp, &args)) != 0) { 195 (void)msdosfs_unmount(mp, 0, p); 196 free(mp, M_MOUNT); 197 return (error); 198 } 199 200 if ((error = vfs_lock(mp)) != 0) { 201 (void)msdosfs_unmount(mp, 0, p); 202 free(mp, M_MOUNT); 203 return (error); 204 } 205 206 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 207 mp->mnt_vnodecovered = NULLVP; 208 (void) copystr("/", mp->mnt_stat.f_mntonname, MNAMELEN - 1, 209 &size); 210 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 211 (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 212 &size); 213 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 214 (void)msdosfs_statfs(mp, &mp->mnt_stat, p); 215 vfs_unlock(mp); 216 return (0); 217 } 218 #endif 219 220 /* 221 * mp - path - addr in user space of mount point (ie /usr or whatever) 222 * data - addr in user space of mount params including the name of the block 223 * special file to treat as a filesystem. 224 */ 225 static int 226 msdosfs_mount(mp, path, data, ndp, td) 227 struct mount *mp; 228 char *path; 229 caddr_t data; 230 struct nameidata *ndp; 231 struct thread *td; 232 { 233 struct vnode *devvp; /* vnode for blk device to mount */ 234 struct msdosfs_args args; /* will hold data from mount request */ 235 /* msdosfs specific mount control block */ 236 struct msdosfsmount *pmp = NULL; 237 size_t size; 238 int error, flags; 239 mode_t accessmode; 240 struct proc *p = td->td_proc; 241 242 KKASSERT(p); 243 244 error = copyin(data, (caddr_t)&args, sizeof(struct msdosfs_args)); 245 if (error) 246 return (error); 247 if (args.magic != MSDOSFS_ARGSMAGIC) 248 args.flags = 0; 249 /* 250 * If updating, check whether changing from read-only to 251 * read/write; if there is no device name, that's all we do. 252 */ 253 if (mp->mnt_flag & MNT_UPDATE) { 254 pmp = VFSTOMSDOSFS(mp); 255 error = 0; 256 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) { 257 flags = WRITECLOSE; 258 if (mp->mnt_flag & MNT_FORCE) 259 flags |= FORCECLOSE; 260 error = vflush(mp, 0, flags); 261 } 262 if (!error && (mp->mnt_flag & MNT_RELOAD)) 263 /* not yet implemented */ 264 error = EOPNOTSUPP; 265 if (error) 266 return (error); 267 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 268 /* 269 * If upgrade to read-write by non-root, then verify 270 * that user has necessary permissions on the device. 271 */ 272 if (p->p_ucred->cr_uid != 0) { 273 devvp = pmp->pm_devvp; 274 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 275 error = VOP_ACCESS(devvp, VREAD | VWRITE, 276 p->p_ucred, td); 277 if (error) { 278 VOP_UNLOCK(devvp, 0, td); 279 return (error); 280 } 281 VOP_UNLOCK(devvp, 0, td); 282 } 283 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 284 } 285 if (args.fspec == 0) { 286 #ifdef __notyet__ /* doesn't work correctly with current mountd XXX */ 287 if (args.flags & MSDOSFSMNT_MNTOPT) { 288 pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT; 289 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT; 290 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 291 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 292 } 293 #endif 294 /* 295 * Process export requests. 296 */ 297 return (vfs_export(mp, &pmp->pm_export, &args.export)); 298 } 299 } 300 /* 301 * Not an update, or updating the name: look up the name 302 * and verify that it refers to a sensible block device. 303 */ 304 NDINIT(ndp, NAMEI_LOOKUP, CNP_FOLLOW, UIO_USERSPACE, args.fspec, td); 305 error = namei(ndp); 306 if (error) 307 return (error); 308 devvp = ndp->ni_vp; 309 NDFREE(ndp, NDF_ONLY_PNBUF); 310 311 if (!vn_isdisk(devvp, &error)) { 312 vrele(devvp); 313 return (error); 314 } 315 /* 316 * If mount by non-root, then verify that user has necessary 317 * permissions on the device. 318 */ 319 if (p->p_ucred->cr_uid != 0) { 320 accessmode = VREAD; 321 if ((mp->mnt_flag & MNT_RDONLY) == 0) 322 accessmode |= VWRITE; 323 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 324 error = VOP_ACCESS(devvp, accessmode, p->p_ucred, td); 325 if (error) { 326 vput(devvp); 327 return (error); 328 } 329 VOP_UNLOCK(devvp, 0, td); 330 } 331 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 332 error = mountmsdosfs(devvp, mp, td, &args); 333 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 334 pmp = VFSTOMSDOSFS(mp); 335 #endif 336 } else { 337 if (devvp != pmp->pm_devvp) 338 error = EINVAL; /* XXX needs translation */ 339 else 340 vrele(devvp); 341 } 342 if (error) { 343 vrele(devvp); 344 return (error); 345 } 346 347 error = update_mp(mp, &args); 348 if (error) { 349 msdosfs_unmount(mp, MNT_FORCE, td); 350 return error; 351 } 352 353 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 354 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 355 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 356 &size); 357 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 358 (void) msdosfs_statfs(mp, &mp->mnt_stat, td); 359 #ifdef MSDOSFS_DEBUG 360 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 361 #endif 362 return (0); 363 } 364 365 static int 366 mountmsdosfs(devvp, mp, td, argp) 367 struct vnode *devvp; 368 struct mount *mp; 369 struct thread *td; 370 struct msdosfs_args *argp; 371 { 372 struct msdosfsmount *pmp; 373 struct buf *bp; 374 dev_t dev = devvp->v_rdev; 375 #ifndef __FreeBSD__ 376 struct partinfo dpart; 377 int bsize = 0, dtype = 0, tmp; 378 #endif 379 union bootsector *bsp; 380 struct byte_bpb33 *b33; 381 struct byte_bpb50 *b50; 382 struct byte_bpb710 *b710; 383 u_int8_t SecPerClust; 384 u_long clusters; 385 int ronly, error; 386 387 /* 388 * Disallow multiple mounts of the same device. 389 * Disallow mounting of a device that is currently in use 390 * (except for root, which might share swap device for miniroot). 391 * Flush out any old buffers remaining from a previous use. 392 */ 393 error = vfs_mountedon(devvp); 394 if (error) 395 return (error); 396 if (vcount(devvp) > 1 && devvp != rootvp) 397 return (EBUSY); 398 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 399 error = vinvalbuf(devvp, V_SAVE, td, 0, 0); 400 VOP_UNLOCK(devvp, 0, td); 401 if (error) 402 return (error); 403 404 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 405 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 406 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, td); 407 VOP_UNLOCK(devvp, 0, td); 408 if (error) 409 return (error); 410 411 bp = NULL; /* both used in error_exit */ 412 pmp = NULL; 413 414 #ifndef __FreeBSD__ 415 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 416 /* 417 * We need the disklabel to calculate the size of a FAT entry 418 * later on. Also make sure the partition contains a filesystem 419 * of type FS_MSDOS. This doesn't work for floppies, so we have 420 * to check for them too. 421 * 422 * At least some parts of the msdos fs driver seem to assume 423 * that the size of a disk block will always be 512 bytes. 424 * Let's check it... 425 */ 426 error = VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, td); 427 if (error) 428 goto error_exit; 429 tmp = dpart.part->p_fstype; 430 dtype = dpart.disklab->d_type; 431 bsize = dpart.disklab->d_secsize; 432 if (bsize != 512 || (dtype!=DTYPE_FLOPPY && tmp!=FS_MSDOS)) { 433 error = EINVAL; 434 goto error_exit; 435 } 436 } 437 #endif 438 439 /* 440 * Read the boot sector of the filesystem, and then check the 441 * boot signature. If not a dos boot sector then error out. 442 * 443 * NOTE: 2048 is a maximum sector size in current... 444 */ 445 error = bread(devvp, 0, 2048, &bp); 446 if (error) 447 goto error_exit; 448 bp->b_flags |= B_AGE; 449 bsp = (union bootsector *)bp->b_data; 450 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 451 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 452 b710 = (struct byte_bpb710 *)bsp->bs710.bsPBP; 453 454 #ifndef __FreeBSD__ 455 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 456 #endif 457 #ifndef MSDOSFS_NOCHECKSIG 458 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 459 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 460 error = EINVAL; 461 goto error_exit; 462 } 463 #endif 464 #ifndef __FreeBSD__ 465 } 466 #endif 467 468 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK); 469 bzero((caddr_t)pmp, sizeof *pmp); 470 pmp->pm_mountp = mp; 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 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 480 pmp->pm_FATs = b50->bpbFATs; 481 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 482 pmp->pm_Sectors = getushort(b50->bpbSectors); 483 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 484 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 485 pmp->pm_Heads = getushort(b50->bpbHeads); 486 pmp->pm_Media = b50->bpbMedia; 487 488 /* calculate the ratio of sector size to DEV_BSIZE */ 489 pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE; 490 491 #ifndef __FreeBSD__ 492 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 493 #endif 494 /* XXX - We should probably check more values here */ 495 if (!pmp->pm_BytesPerSec || !SecPerClust 496 || !pmp->pm_Heads || pmp->pm_Heads > 255 497 #ifdef PC98 498 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 255) { 499 #else 500 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 63) { 501 #endif 502 error = EINVAL; 503 goto error_exit; 504 } 505 #ifndef __FreeBSD__ 506 } 507 #endif 508 509 if (pmp->pm_Sectors == 0) { 510 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 511 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 512 } else { 513 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 514 pmp->pm_HugeSectors = pmp->pm_Sectors; 515 } 516 if (pmp->pm_HugeSectors > 0xffffffff / 517 (pmp->pm_BytesPerSec / sizeof(struct direntry)) + 1) { 518 /* 519 * We cannot deal currently with this size of disk 520 * due to fileid limitations (see msdosfs_getattr and 521 * msdosfs_readdir) 522 */ 523 error = EINVAL; 524 printf("mountmsdosfs(): disk too big, sorry\n"); 525 goto error_exit; 526 } 527 528 if (pmp->pm_RootDirEnts == 0) { 529 if (bsp->bs710.bsBootSectSig2 != BOOTSIG2 530 || bsp->bs710.bsBootSectSig3 != BOOTSIG3 531 || pmp->pm_Sectors 532 || pmp->pm_FATsecs 533 || getushort(b710->bpbFSVers)) { 534 error = EINVAL; 535 printf("mountmsdosfs(): bad FAT32 filesystem\n"); 536 goto error_exit; 537 } 538 pmp->pm_fatmask = FAT32_MASK; 539 pmp->pm_fatmult = 4; 540 pmp->pm_fatdiv = 1; 541 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 542 if (getushort(b710->bpbExtFlags) & FATMIRROR) 543 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 544 else 545 pmp->pm_flags |= MSDOSFS_FATMIRROR; 546 } else 547 pmp->pm_flags |= MSDOSFS_FATMIRROR; 548 549 /* 550 * Check a few values (could do some more): 551 * - logical sector size: power of 2, >= block size 552 * - sectors per cluster: power of 2, >= 1 553 * - number of sectors: >= 1, <= size of partition 554 */ 555 if ( (SecPerClust == 0) 556 || (SecPerClust & (SecPerClust - 1)) 557 || (pmp->pm_BytesPerSec < DEV_BSIZE) 558 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 559 || (pmp->pm_HugeSectors == 0) 560 ) { 561 error = EINVAL; 562 goto error_exit; 563 } 564 565 pmp->pm_HugeSectors *= pmp->pm_BlkPerSec; 566 pmp->pm_HiddenSects *= pmp->pm_BlkPerSec; /* XXX not used? */ 567 pmp->pm_FATsecs *= pmp->pm_BlkPerSec; 568 SecPerClust *= pmp->pm_BlkPerSec; 569 570 pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec; 571 572 if (FAT32(pmp)) { 573 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 574 pmp->pm_firstcluster = pmp->pm_fatblk 575 + (pmp->pm_FATs * pmp->pm_FATsecs); 576 pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec; 577 } else { 578 pmp->pm_rootdirblk = pmp->pm_fatblk + 579 (pmp->pm_FATs * pmp->pm_FATsecs); 580 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 581 + DEV_BSIZE - 1) 582 / DEV_BSIZE; /* in blocks */ 583 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 584 } 585 586 pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 587 SecPerClust + 1; 588 pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE; /* XXX not used? */ 589 590 #ifndef __FreeBSD__ 591 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 592 if ((pmp->pm_maxcluster <= (0xff0 - 2)) 593 && ((dtype == DTYPE_FLOPPY) || ((dtype == DTYPE_VNODE) 594 && ((pmp->pm_Heads == 1) || (pmp->pm_Heads == 2)))) 595 ) { 596 pmp->pm_fatmask = FAT12_MASK; 597 pmp->pm_fatmult = 3; 598 pmp->pm_fatdiv = 2; 599 } else { 600 pmp->pm_fatmask = FAT16_MASK; 601 pmp->pm_fatmult = 2; 602 pmp->pm_fatdiv = 1; 603 } 604 } else 605 #endif 606 if (pmp->pm_fatmask == 0) { 607 if (pmp->pm_maxcluster 608 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 609 /* 610 * This will usually be a floppy disk. This size makes 611 * sure that one fat entry will not be split across 612 * multiple blocks. 613 */ 614 pmp->pm_fatmask = FAT12_MASK; 615 pmp->pm_fatmult = 3; 616 pmp->pm_fatdiv = 2; 617 } else { 618 pmp->pm_fatmask = FAT16_MASK; 619 pmp->pm_fatmult = 2; 620 pmp->pm_fatdiv = 1; 621 } 622 } 623 624 clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv; 625 if (pmp->pm_maxcluster >= clusters) { 626 printf("Warning: number of clusters (%ld) exceeds FAT " 627 "capacity (%ld)\n", pmp->pm_maxcluster + 1, clusters); 628 pmp->pm_maxcluster = clusters - 1; 629 } 630 631 632 if (FAT12(pmp)) 633 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 634 else 635 pmp->pm_fatblocksize = MSDOSFS_DFLTBSIZE; 636 637 pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE; 638 pmp->pm_bnshift = ffs(DEV_BSIZE) - 1; 639 640 /* 641 * Compute mask and shift value for isolating cluster relative byte 642 * offsets and cluster numbers from a file offset. 643 */ 644 pmp->pm_bpcluster = SecPerClust * DEV_BSIZE; 645 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 646 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 647 648 /* 649 * Check for valid cluster size 650 * must be a power of 2 651 */ 652 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 653 error = EINVAL; 654 goto error_exit; 655 } 656 657 /* 658 * Release the bootsector buffer. 659 */ 660 brelse(bp); 661 bp = NULL; 662 663 /* 664 * Check FSInfo. 665 */ 666 if (pmp->pm_fsinfo) { 667 struct fsinfo *fp; 668 669 if ((error = bread(devvp, pmp->pm_fsinfo, fsi_size(pmp), &bp)) != 0) 670 goto error_exit; 671 fp = (struct fsinfo *)bp->b_data; 672 if (!bcmp(fp->fsisig1, "RRaA", 4) 673 && !bcmp(fp->fsisig2, "rrAa", 4) 674 && !bcmp(fp->fsisig3, "\0\0\125\252", 4) 675 && !bcmp(fp->fsisig4, "\0\0\125\252", 4)) 676 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 677 else 678 pmp->pm_fsinfo = 0; 679 brelse(bp); 680 bp = NULL; 681 } 682 683 /* 684 * Check and validate (or perhaps invalidate?) the fsinfo structure? 685 */ 686 if (pmp->pm_fsinfo && pmp->pm_nxtfree > pmp->pm_maxcluster) { 687 printf( 688 "Next free cluster in FSInfo (%lu) exceeds maxcluster (%lu)\n", 689 pmp->pm_nxtfree, pmp->pm_maxcluster); 690 error = EINVAL; 691 goto error_exit; 692 } 693 694 /* 695 * Allocate memory for the bitmap of allocated clusters, and then 696 * fill it in. 697 */ 698 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 699 / N_INUSEBITS) 700 * sizeof(*pmp->pm_inusemap), 701 M_MSDOSFSFAT, M_WAITOK); 702 703 /* 704 * fillinusemap() needs pm_devvp. 705 */ 706 pmp->pm_dev = dev; 707 pmp->pm_devvp = devvp; 708 709 /* 710 * Have the inuse map filled in. 711 */ 712 if ((error = fillinusemap(pmp)) != 0) 713 goto error_exit; 714 715 /* 716 * If they want fat updates to be synchronous then let them suffer 717 * the performance degradation in exchange for the on disk copy of 718 * the fat being correct just about all the time. I suppose this 719 * would be a good thing to turn on if the kernel is still flakey. 720 */ 721 if (mp->mnt_flag & MNT_SYNCHRONOUS) 722 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 723 724 /* 725 * Finish up. 726 */ 727 if (ronly) 728 pmp->pm_flags |= MSDOSFSMNT_RONLY; 729 else 730 pmp->pm_fmod = 1; 731 mp->mnt_data = (qaddr_t) pmp; 732 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 733 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 734 mp->mnt_flag |= MNT_LOCAL; 735 devvp->v_specmountpoint = mp; 736 737 return 0; 738 739 error_exit: 740 if (bp) 741 brelse(bp); 742 (void) VOP_CLOSE(devvp, ronly ? FREAD : FREAD | FWRITE, td); 743 if (pmp) { 744 if (pmp->pm_inusemap) 745 free(pmp->pm_inusemap, M_MSDOSFSFAT); 746 free(pmp, M_MSDOSFSMNT); 747 mp->mnt_data = (qaddr_t)0; 748 } 749 return (error); 750 } 751 752 /* 753 * Unmount the filesystem described by mp. 754 */ 755 static int 756 msdosfs_unmount(mp, mntflags, td) 757 struct mount *mp; 758 int mntflags; 759 struct thread *td; 760 { 761 struct msdosfsmount *pmp; 762 int error, flags; 763 764 flags = 0; 765 if (mntflags & MNT_FORCE) 766 flags |= FORCECLOSE; 767 error = vflush(mp, 0, flags); 768 if (error) 769 return error; 770 pmp = VFSTOMSDOSFS(mp); 771 pmp->pm_devvp->v_specmountpoint = NULL; 772 #ifdef MSDOSFS_DEBUG 773 { 774 struct vnode *vp = pmp->pm_devvp; 775 776 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 777 printf("flag %08lx, usecount %d, writecount %d, holdcnt %ld\n", 778 vp->v_flag, vp->v_usecount, vp->v_writecount, vp->v_holdcnt); 779 printf("id %lu, mount %p, op %p\n", 780 vp->v_id, vp->v_mount, vp->v_op); 781 printf("freef %p, freeb %p, mount %p\n", 782 vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev, 783 vp->v_mount); 784 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %ld, type %d\n", 785 TAILQ_FIRST(&vp->v_cleanblkhd), 786 TAILQ_FIRST(&vp->v_dirtyblkhd), 787 vp->v_numoutput, vp->v_type); 788 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 789 vp->v_socket, vp->v_tag, 790 ((u_int *)vp->v_data)[0], 791 ((u_int *)vp->v_data)[1]); 792 } 793 #endif 794 error = VOP_CLOSE(pmp->pm_devvp, 795 (pmp->pm_flags&MSDOSFSMNT_RONLY) ? FREAD : FREAD | FWRITE, 796 td); 797 vrele(pmp->pm_devvp); 798 free(pmp->pm_inusemap, M_MSDOSFSFAT); 799 free(pmp, M_MSDOSFSMNT); 800 mp->mnt_data = (qaddr_t)0; 801 mp->mnt_flag &= ~MNT_LOCAL; 802 return (error); 803 } 804 805 static int 806 msdosfs_root(mp, vpp) 807 struct mount *mp; 808 struct vnode **vpp; 809 { 810 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 811 struct denode *ndep; 812 int error; 813 814 #ifdef MSDOSFS_DEBUG 815 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 816 #endif 817 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep); 818 if (error) 819 return (error); 820 *vpp = DETOV(ndep); 821 return (0); 822 } 823 824 static int 825 msdosfs_statfs(mp, sbp, td) 826 struct mount *mp; 827 struct statfs *sbp; 828 struct thread *td; 829 { 830 struct msdosfsmount *pmp; 831 832 pmp = VFSTOMSDOSFS(mp); 833 sbp->f_bsize = pmp->pm_bpcluster; 834 sbp->f_iosize = pmp->pm_bpcluster; 835 sbp->f_blocks = pmp->pm_maxcluster + 1; 836 sbp->f_bfree = pmp->pm_freeclustercount; 837 sbp->f_bavail = pmp->pm_freeclustercount; 838 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 839 sbp->f_ffree = 0; /* what to put in here? */ 840 if (sbp != &mp->mnt_stat) { 841 sbp->f_type = mp->mnt_vfc->vfc_typenum; 842 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 843 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 844 } 845 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN); 846 return (0); 847 } 848 849 static int 850 msdosfs_sync(mp, waitfor, td) 851 struct mount *mp; 852 int waitfor; 853 struct thread *td; 854 { 855 struct vnode *vp, *nvp; 856 struct denode *dep; 857 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 858 int error, allerror = 0; 859 int gen; 860 861 /* 862 * If we ever switch to not updating all of the fats all the time, 863 * this would be the place to update them from the first one. 864 */ 865 if (pmp->pm_fmod != 0) { 866 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 867 panic("msdosfs_sync: rofs mod"); 868 else { 869 /* update fats here */ 870 } 871 } 872 /* 873 * Write back each (modified) denode. 874 * 875 * YYY gen number handling needs more work. 876 */ 877 gen = lwkt_gettoken(&mntvnode_token); 878 loop: 879 for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist); vp != NULL; vp = nvp) { 880 lwkt_gettoken(&vp->v_interlock); 881 /* 882 * If the vnode that we are about to sync is no longer 883 * associated with this mount point, start over. If 884 * we lost the mntvnode token, start over. 885 */ 886 if (vp->v_mount != mp) { 887 lwkt_reltoken(&vp->v_interlock); 888 goto loop; 889 } 890 if (lwkt_gentoken(&mntvnode_token, &gen) != 0) { 891 lwkt_reltoken(&vp->v_interlock); 892 goto loop; 893 } 894 nvp = TAILQ_NEXT(vp, v_nmntvnodes); 895 dep = VTODE(vp); 896 if (vp->v_type == VNON || 897 ((dep->de_flag & 898 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 && 899 (TAILQ_EMPTY(&vp->v_dirtyblkhd) || waitfor == MNT_LAZY))) { 900 lwkt_reltoken(&vp->v_interlock); 901 continue; 902 } 903 lwkt_reltoken(&mntvnode_token); 904 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td); 905 if (error) { 906 lwkt_gettoken(&mntvnode_token); 907 if (error == ENOENT) 908 goto loop; 909 continue; 910 } 911 error = VOP_FSYNC(vp, waitfor, td); 912 if (error) 913 allerror = error; 914 VOP_UNLOCK(vp, 0, td); 915 vrele(vp); 916 lwkt_gettoken(&mntvnode_token); 917 } 918 lwkt_reltoken(&mntvnode_token); 919 920 /* 921 * Flush filesystem control info. 922 */ 923 if (waitfor != MNT_LAZY) { 924 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY, td); 925 error = VOP_FSYNC(pmp->pm_devvp, waitfor, td); 926 if (error) 927 allerror = error; 928 VOP_UNLOCK(pmp->pm_devvp, 0, td); 929 } 930 return (allerror); 931 } 932 933 static int 934 msdosfs_fhtovp(mp, fhp, vpp) 935 struct mount *mp; 936 struct fid *fhp; 937 struct vnode **vpp; 938 { 939 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 940 struct defid *defhp = (struct defid *) fhp; 941 struct denode *dep; 942 int error; 943 944 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 945 if (error) { 946 *vpp = NULLVP; 947 return (error); 948 } 949 *vpp = DETOV(dep); 950 return (0); 951 } 952 953 static int 954 msdosfs_checkexp(mp, nam, exflagsp, credanonp) 955 struct mount *mp; 956 struct sockaddr *nam; 957 int *exflagsp; 958 struct ucred **credanonp; 959 { 960 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 961 struct netcred *np; 962 963 np = vfs_export_lookup(mp, &pmp->pm_export, nam); 964 if (np == NULL) 965 return (EACCES); 966 *exflagsp = np->netc_exflags; 967 *credanonp = &np->netc_anon; 968 return (0); 969 } 970 971 static int 972 msdosfs_vptofh(vp, fhp) 973 struct vnode *vp; 974 struct fid *fhp; 975 { 976 struct denode *dep; 977 struct defid *defhp; 978 979 dep = VTODE(vp); 980 defhp = (struct defid *)fhp; 981 defhp->defid_len = sizeof(struct defid); 982 defhp->defid_dirclust = dep->de_dirclust; 983 defhp->defid_dirofs = dep->de_diroffset; 984 /* defhp->defid_gen = dep->de_gen; */ 985 return (0); 986 } 987 988 static struct vfsops msdosfs_vfsops = { 989 msdosfs_mount, 990 vfs_stdstart, 991 msdosfs_unmount, 992 msdosfs_root, 993 vfs_stdquotactl, 994 msdosfs_statfs, 995 msdosfs_sync, 996 vfs_stdvget, 997 msdosfs_fhtovp, 998 msdosfs_checkexp, 999 msdosfs_vptofh, 1000 msdosfs_init, 1001 msdosfs_uninit, 1002 vfs_stdextattrctl, 1003 }; 1004 1005 VFS_SET(msdosfs_vfsops, msdos, 0); 1006