1 /* $Id: msdosfs_vfsops.c,v 1.38 1998/10/31 15:31:24 peter Exp $ */ 2 /* $NetBSD: msdosfs_vfsops.c,v 1.51 1997/11/17 15:36:58 ws Exp $ */ 3 4 /*- 5 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. 6 * Copyright (C) 1994, 1995, 1997 TooLs GmbH. 7 * All rights reserved. 8 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by TooLs GmbH. 21 * 4. The name of TooLs GmbH may not be used to endorse or promote products 22 * derived from this software without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 27 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 29 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 30 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 31 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 32 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 33 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 /* 36 * Written by Paul Popelka (paulp@uts.amdahl.com) 37 * 38 * You can do anything you want with this software, just don't say you wrote 39 * it, and don't remove this notice. 40 * 41 * This software is provided "as is". 42 * 43 * The author supplies this software to be publicly redistributed on the 44 * understanding that the author is not responsible for the correct 45 * functioning of this software in any circumstances and is not liable for 46 * any damages caused by this software. 47 * 48 * October 1992 49 */ 50 51 #include <sys/param.h> 52 #include <sys/systm.h> 53 #include <sys/conf.h> 54 #include <sys/namei.h> 55 #include <sys/proc.h> 56 #include <sys/kernel.h> 57 #include <sys/vnode.h> 58 #include <miscfs/specfs/specdev.h> /* XXX */ /* defines v_rdev */ 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 65 #include <msdosfs/bpb.h> 66 #include <msdosfs/bootsect.h> 67 #include <msdosfs/direntry.h> 68 #include <msdosfs/denode.h> 69 #include <msdosfs/msdosfsmount.h> 70 #include <msdosfs/fat.h> 71 72 MALLOC_DEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOSFS mount structure"); 73 static MALLOC_DEFINE(M_MSDOSFSFAT, "MSDOSFS FAT", "MSDOSFS file allocation table"); 74 75 static int update_mp __P((struct mount *mp, struct msdosfs_args *argp)); 76 static int mountmsdosfs __P((struct vnode *devvp, struct mount *mp, 77 struct proc *p, struct msdosfs_args *argp)); 78 static int msdosfs_fhtovp __P((struct mount *, struct fid *, 79 struct sockaddr *, struct vnode **, int *, 80 struct ucred **)); 81 static int msdosfs_mount __P((struct mount *, char *, caddr_t, 82 struct nameidata *, struct proc *)); 83 static int msdosfs_quotactl __P((struct mount *, int, uid_t, caddr_t, 84 struct proc *)); 85 static int msdosfs_root __P((struct mount *, struct vnode **)); 86 static int msdosfs_start __P((struct mount *, int, struct proc *)); 87 static int msdosfs_statfs __P((struct mount *, struct statfs *, 88 struct proc *)); 89 static int msdosfs_sync __P((struct mount *, int, struct ucred *, 90 struct proc *)); 91 static int msdosfs_unmount __P((struct mount *, int, struct proc *)); 92 static int msdosfs_vget __P((struct mount *mp, ino_t ino, 93 struct vnode **vpp)); 94 static int msdosfs_vptofh __P((struct vnode *, struct fid *)); 95 96 static int 97 update_mp(mp, argp) 98 struct mount *mp; 99 struct msdosfs_args *argp; 100 { 101 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 102 int error; 103 104 pmp->pm_gid = argp->gid; 105 pmp->pm_uid = argp->uid; 106 pmp->pm_mask = argp->mask & ALLPERMS; 107 pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT; 108 if (pmp->pm_flags & MSDOSFSMNT_U2WTABLE) { 109 bcopy(argp->u2w, pmp->pm_u2w, sizeof(pmp->pm_u2w)); 110 bcopy(argp->d2u, pmp->pm_d2u, sizeof(pmp->pm_d2u)); 111 bcopy(argp->u2d, pmp->pm_u2d, sizeof(pmp->pm_u2d)); 112 } 113 if (pmp->pm_flags & MSDOSFSMNT_ULTABLE) { 114 bcopy(argp->ul, pmp->pm_ul, sizeof(pmp->pm_ul)); 115 bcopy(argp->lu, pmp->pm_lu, sizeof(pmp->pm_lu)); 116 } 117 118 #ifndef __FreeBSD__ 119 /* 120 * GEMDOS knows nothing (yet) about win95 121 */ 122 if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS) 123 pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 124 #endif 125 126 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 127 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 128 else if (!(pmp->pm_flags & 129 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 130 struct vnode *rootvp; 131 132 /* 133 * Try to divine whether to support Win'95 long filenames 134 */ 135 if (FAT32(pmp)) 136 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 137 else { 138 if ((error = msdosfs_root(mp, &rootvp)) != 0) 139 return error; 140 pmp->pm_flags |= findwin95(VTODE(rootvp)) 141 ? MSDOSFSMNT_LONGNAME 142 : MSDOSFSMNT_SHORTNAME; 143 vput(rootvp); 144 } 145 } 146 return 0; 147 } 148 149 #ifndef __FreeBSD__ 150 int 151 msdosfs_mountroot() 152 { 153 register struct mount *mp; 154 struct proc *p = curproc; /* XXX */ 155 size_t size; 156 int error; 157 struct msdosfs_args args; 158 159 if (root_device->dv_class != DV_DISK) 160 return (ENODEV); 161 162 /* 163 * Get vnodes for swapdev and rootdev. 164 */ 165 if (bdevvp(rootdev, &rootvp)) 166 panic("msdosfs_mountroot: can't setup rootvp"); 167 168 mp = malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK); 169 bzero((char *)mp, (u_long)sizeof(struct mount)); 170 mp->mnt_op = &msdosfs_vfsops; 171 mp->mnt_flag = 0; 172 LIST_INIT(&mp->mnt_vnodelist); 173 174 args.flags = 0; 175 args.uid = 0; 176 args.gid = 0; 177 args.mask = 0777; 178 179 if ((error = mountmsdosfs(rootvp, mp, p, &args)) != 0) { 180 free(mp, M_MOUNT); 181 return (error); 182 } 183 184 if ((error = update_mp(mp, &args)) != 0) { 185 (void)msdosfs_unmount(mp, 0, p); 186 free(mp, M_MOUNT); 187 return (error); 188 } 189 190 if ((error = vfs_lock(mp)) != 0) { 191 (void)msdosfs_unmount(mp, 0, p); 192 free(mp, M_MOUNT); 193 return (error); 194 } 195 196 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 197 mp->mnt_vnodecovered = NULLVP; 198 (void) copystr("/", mp->mnt_stat.f_mntonname, MNAMELEN - 1, 199 &size); 200 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 201 (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 202 &size); 203 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 204 (void)msdosfs_statfs(mp, &mp->mnt_stat, p); 205 vfs_unlock(mp); 206 return (0); 207 } 208 #endif 209 210 /* 211 * mp - path - addr in user space of mount point (ie /usr or whatever) 212 * data - addr in user space of mount params including the name of the block 213 * special file to treat as a filesystem. 214 */ 215 static int 216 msdosfs_mount(mp, path, data, ndp, p) 217 struct mount *mp; 218 char *path; 219 caddr_t data; 220 struct nameidata *ndp; 221 struct proc *p; 222 { 223 struct vnode *devvp; /* vnode for blk device to mount */ 224 struct msdosfs_args args; /* will hold data from mount request */ 225 /* msdosfs specific mount control block */ 226 struct msdosfsmount *pmp = NULL; 227 size_t size; 228 int error, flags; 229 mode_t accessmode; 230 231 error = copyin(data, (caddr_t)&args, sizeof(struct msdosfs_args)); 232 if (error) 233 return (error); 234 if (args.magic != MSDOSFS_ARGSMAGIC) 235 args.flags = 0; 236 /* 237 * If updating, check whether changing from read-only to 238 * read/write; if there is no device name, that's all we do. 239 */ 240 if (mp->mnt_flag & MNT_UPDATE) { 241 pmp = VFSTOMSDOSFS(mp); 242 error = 0; 243 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) { 244 flags = WRITECLOSE; 245 if (mp->mnt_flag & MNT_FORCE) 246 flags |= FORCECLOSE; 247 error = vflush(mp, NULLVP, flags); 248 } 249 if (!error && (mp->mnt_flag & MNT_RELOAD)) 250 /* not yet implemented */ 251 error = EOPNOTSUPP; 252 if (error) 253 return (error); 254 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 255 /* 256 * If upgrade to read-write by non-root, then verify 257 * that user has necessary permissions on the device. 258 */ 259 if (p->p_ucred->cr_uid != 0) { 260 devvp = pmp->pm_devvp; 261 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p); 262 error = VOP_ACCESS(devvp, VREAD | VWRITE, 263 p->p_ucred, p); 264 if (error) { 265 VOP_UNLOCK(devvp, 0, p); 266 return (error); 267 } 268 VOP_UNLOCK(devvp, 0, p); 269 } 270 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 271 } 272 if (args.fspec == 0) { 273 #ifdef __notyet__ /* doesn't work correctly with current mountd XXX */ 274 if (args.flags & MSDOSFSMNT_MNTOPT) { 275 pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT; 276 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT; 277 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 278 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 279 } 280 #endif 281 /* 282 * Process export requests. 283 */ 284 return (vfs_export(mp, &pmp->pm_export, &args.export)); 285 } 286 } 287 /* 288 * Not an update, or updating the name: look up the name 289 * and verify that it refers to a sensible block device. 290 */ 291 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p); 292 error = namei(ndp); 293 if (error) 294 return (error); 295 devvp = ndp->ni_vp; 296 297 if (devvp->v_type != VBLK) { 298 vrele(devvp); 299 return (ENOTBLK); 300 } 301 if (major(devvp->v_rdev) >= nblkdev || 302 bdevsw[major(devvp->v_rdev)] == NULL) { 303 vrele(devvp); 304 return (ENXIO); 305 } 306 /* 307 * If mount by non-root, then verify that user has necessary 308 * permissions on the device. 309 */ 310 if (p->p_ucred->cr_uid != 0) { 311 accessmode = VREAD; 312 if ((mp->mnt_flag & MNT_RDONLY) == 0) 313 accessmode |= VWRITE; 314 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p); 315 error = VOP_ACCESS(devvp, accessmode, p->p_ucred, p); 316 if (error) { 317 vput(devvp); 318 return (error); 319 } 320 VOP_UNLOCK(devvp, 0, p); 321 } 322 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 323 error = mountmsdosfs(devvp, mp, p, &args); 324 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 325 pmp = VFSTOMSDOSFS(mp); 326 #endif 327 } else { 328 if (devvp != pmp->pm_devvp) 329 error = EINVAL; /* XXX needs translation */ 330 else 331 vrele(devvp); 332 } 333 if (error) { 334 vrele(devvp); 335 return (error); 336 } 337 338 error = update_mp(mp, &args); 339 if (error) { 340 msdosfs_unmount(mp, MNT_FORCE, p); 341 return error; 342 } 343 344 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 345 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 346 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 347 &size); 348 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 349 (void) msdosfs_statfs(mp, &mp->mnt_stat, p); 350 #ifdef MSDOSFS_DEBUG 351 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 352 #endif 353 return (0); 354 } 355 356 static int 357 mountmsdosfs(devvp, mp, p, argp) 358 struct vnode *devvp; 359 struct mount *mp; 360 struct proc *p; 361 struct msdosfs_args *argp; 362 { 363 struct msdosfsmount *pmp; 364 struct buf *bp; 365 dev_t dev = devvp->v_rdev; 366 #ifndef __FreeBSD__ 367 struct partinfo dpart; 368 int bsize = 0, dtype = 0, tmp; 369 #endif 370 union bootsector *bsp; 371 struct byte_bpb33 *b33; 372 struct byte_bpb50 *b50; 373 struct byte_bpb710 *b710; 374 u_int8_t SecPerClust; 375 int ronly, error; 376 377 /* 378 * Disallow multiple mounts of the same device. 379 * Disallow mounting of a device that is currently in use 380 * (except for root, which might share swap device for miniroot). 381 * Flush out any old buffers remaining from a previous use. 382 */ 383 error = vfs_mountedon(devvp); 384 if (error) 385 return (error); 386 if (vcount(devvp) > 1 && devvp != rootvp) 387 return (EBUSY); 388 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p); 389 error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0); 390 VOP_UNLOCK(devvp, 0, p); 391 if (error) 392 return (error); 393 394 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 395 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p); 396 if (error) 397 return (error); 398 399 bp = NULL; /* both used in error_exit */ 400 pmp = NULL; 401 402 #ifndef __FreeBSD__ 403 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 404 /* 405 * We need the disklabel to calculate the size of a FAT entry 406 * later on. Also make sure the partition contains a filesystem 407 * of type FS_MSDOS. This doesn't work for floppies, so we have 408 * to check for them too. 409 * 410 * At least some parts of the msdos fs driver seem to assume 411 * that the size of a disk block will always be 512 bytes. 412 * Let's check it... 413 */ 414 error = VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, 415 FREAD, NOCRED, p); 416 if (error) 417 goto error_exit; 418 tmp = dpart.part->p_fstype; 419 dtype = dpart.disklab->d_type; 420 bsize = dpart.disklab->d_secsize; 421 if (bsize != 512 || (dtype!=DTYPE_FLOPPY && tmp!=FS_MSDOS)) { 422 error = EINVAL; 423 goto error_exit; 424 } 425 } 426 #endif 427 428 /* 429 * Read the boot sector of the filesystem, and then check the 430 * boot signature. If not a dos boot sector then error out. 431 */ 432 #ifdef PC98 433 error = bread(devvp, 0, 1024, NOCRED, &bp); 434 #else 435 error = bread(devvp, 0, 512, NOCRED, &bp); 436 #endif 437 if (error) 438 goto error_exit; 439 bp->b_flags |= B_AGE; 440 bsp = (union bootsector *)bp->b_data; 441 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 442 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 443 b710 = (struct byte_bpb710 *)bsp->bs710.bsPBP; 444 445 #ifndef __FreeBSD__ 446 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 447 #endif 448 #ifdef PC98 449 if ((bsp->bs50.bsBootSectSig0 != BOOTSIG0 450 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) 451 && (bsp->bs50.bsBootSectSig0 != 0 /* PC98 DOS 3.3x */ 452 || bsp->bs50.bsBootSectSig1 != 0) 453 && (bsp->bs50.bsBootSectSig0 != 0x90 /* PC98 DOS 5.0 */ 454 || bsp->bs50.bsBootSectSig1 != 0x3d) 455 && (bsp->bs50.bsBootSectSig0 != 0x46 /* PC98 DOS 3.3B */ 456 || bsp->bs50.bsBootSectSig1 != 0xfa)) { 457 #else 458 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 459 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 460 #endif 461 error = EINVAL; 462 printf("mountmsdosfs(): bad signature\n"); 463 goto error_exit; 464 } 465 #ifndef __FreeBSD__ 466 } 467 #endif 468 469 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK); 470 bzero((caddr_t)pmp, sizeof *pmp); 471 pmp->pm_mountp = mp; 472 473 /* 474 * Compute several useful quantities from the bpb in the 475 * bootsector. Copy in the dos 5 variant of the bpb then fix up 476 * the fields that are different between dos 5 and dos 3.3. 477 */ 478 SecPerClust = b50->bpbSecPerClust; 479 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 480 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 481 pmp->pm_FATs = b50->bpbFATs; 482 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 483 pmp->pm_Sectors = getushort(b50->bpbSectors); 484 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 485 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 486 pmp->pm_Heads = getushort(b50->bpbHeads); 487 pmp->pm_Media = b50->bpbMedia; 488 489 #ifndef __FreeBSD__ 490 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 491 #endif 492 /* XXX - We should probably check more values here */ 493 if (!pmp->pm_BytesPerSec || !SecPerClust 494 || !pmp->pm_Heads || pmp->pm_Heads > 255 495 #ifdef PC98 496 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 255) { 497 #else 498 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 63) { 499 #endif 500 error = EINVAL; 501 printf("mountmsdosfs(): bad bpb\n"); 502 goto error_exit; 503 } 504 #ifndef __FreeBSD__ 505 } 506 #endif 507 508 if (pmp->pm_Sectors == 0) { 509 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 510 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 511 } else { 512 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 513 pmp->pm_HugeSectors = pmp->pm_Sectors; 514 } 515 if (pmp->pm_HugeSectors > 0xffffffff / 516 (pmp->pm_BytesPerSec / sizeof(struct direntry)) + 1) { 517 /* 518 * We cannot deal currently with this size of disk 519 * due to fileid limitations (see msdosfs_getattr and 520 * msdosfs_readdir) 521 */ 522 error = EINVAL; 523 printf("mountmsdosfs(): disk too big, sorry\n"); 524 goto error_exit; 525 } 526 527 if (pmp->pm_RootDirEnts == 0) { 528 if (bsp->bs710.bsBootSectSig2 != BOOTSIG2 529 || bsp->bs710.bsBootSectSig3 != BOOTSIG3 530 || pmp->pm_Sectors 531 || pmp->pm_FATsecs 532 || getushort(b710->bpbFSVers)) { 533 error = EINVAL; 534 printf("mountmsdosfs(): bad FAT32 filesystem\n"); 535 goto error_exit; 536 } 537 pmp->pm_fatmask = FAT32_MASK; 538 pmp->pm_fatmult = 4; 539 pmp->pm_fatdiv = 1; 540 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 541 if (getushort(b710->bpbExtFlags) & FATMIRROR) 542 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 543 else 544 pmp->pm_flags |= MSDOSFS_FATMIRROR; 545 } else 546 pmp->pm_flags |= MSDOSFS_FATMIRROR; 547 548 #ifndef __FreeBSD__ 549 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 550 if (FAT32(pmp)) { 551 /* 552 * GEMDOS doesn't know fat32. 553 */ 554 error = EINVAL; 555 goto error_exit; 556 } 557 558 /* 559 * Check a few values (could do some more): 560 * - logical sector size: power of 2, >= block size 561 * - sectors per cluster: power of 2, >= 1 562 * - number of sectors: >= 1, <= size of partition 563 */ 564 if ( (SecPerClust == 0) 565 || (SecPerClust & (SecPerClust - 1)) 566 || (pmp->pm_BytesPerSec < bsize) 567 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 568 || (pmp->pm_HugeSectors == 0) 569 || (pmp->pm_HugeSectors * (pmp->pm_BytesPerSec / bsize) 570 > dpart.part->p_size) 571 ) { 572 error = EINVAL; 573 goto error_exit; 574 } 575 /* 576 * XXX - Many parts of the msdos fs driver seem to assume that 577 * the number of bytes per logical sector (BytesPerSec) will 578 * always be the same as the number of bytes per disk block 579 * Let's pretend it is. 580 */ 581 tmp = pmp->pm_BytesPerSec / bsize; 582 pmp->pm_BytesPerSec = bsize; 583 pmp->pm_HugeSectors *= tmp; 584 pmp->pm_HiddenSects *= tmp; 585 pmp->pm_ResSectors *= tmp; 586 pmp->pm_Sectors *= tmp; 587 pmp->pm_FATsecs *= tmp; 588 SecPerClust *= tmp; 589 } 590 #endif 591 pmp->pm_fatblk = pmp->pm_ResSectors; 592 if (FAT32(pmp)) { 593 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 594 pmp->pm_firstcluster = pmp->pm_fatblk 595 + (pmp->pm_FATs * pmp->pm_FATsecs); 596 pmp->pm_fsinfo = getushort(b710->bpbFSInfo); 597 } else { 598 pmp->pm_rootdirblk = pmp->pm_fatblk + 599 (pmp->pm_FATs * pmp->pm_FATsecs); 600 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 601 + pmp->pm_BytesPerSec - 1) 602 / pmp->pm_BytesPerSec;/* in sectors */ 603 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 604 } 605 606 pmp->pm_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 607 SecPerClust; 608 pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 1; 609 pmp->pm_fatsize = pmp->pm_FATsecs * pmp->pm_BytesPerSec; 610 611 #ifndef __FreeBSD__ 612 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 613 if ((pmp->pm_nmbrofclusters <= (0xff0 - 2)) 614 && ((dtype == DTYPE_FLOPPY) || ((dtype == DTYPE_VNODE) 615 && ((pmp->pm_Heads == 1) || (pmp->pm_Heads == 2)))) 616 ) { 617 pmp->pm_fatmask = FAT12_MASK; 618 pmp->pm_fatmult = 3; 619 pmp->pm_fatdiv = 2; 620 } else { 621 pmp->pm_fatmask = FAT16_MASK; 622 pmp->pm_fatmult = 2; 623 pmp->pm_fatdiv = 1; 624 } 625 } else 626 #endif 627 if (pmp->pm_fatmask == 0) { 628 if (pmp->pm_maxcluster 629 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 630 /* 631 * This will usually be a floppy disk. This size makes 632 * sure that one fat entry will not be split across 633 * multiple blocks. 634 */ 635 pmp->pm_fatmask = FAT12_MASK; 636 pmp->pm_fatmult = 3; 637 pmp->pm_fatdiv = 2; 638 } else { 639 pmp->pm_fatmask = FAT16_MASK; 640 pmp->pm_fatmult = 2; 641 pmp->pm_fatdiv = 1; 642 } 643 } 644 if (FAT12(pmp)) 645 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 646 else 647 pmp->pm_fatblocksize = DFLTBSIZE; 648 649 pmp->pm_fatblocksec = pmp->pm_fatblocksize / pmp->pm_BytesPerSec; 650 pmp->pm_bnshift = ffs(pmp->pm_BytesPerSec) - 1; 651 652 /* 653 * Compute mask and shift value for isolating cluster relative byte 654 * offsets and cluster numbers from a file offset. 655 */ 656 pmp->pm_bpcluster = SecPerClust * pmp->pm_BytesPerSec; 657 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 658 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 659 660 /* 661 * Check for valid cluster size 662 * must be a power of 2 663 */ 664 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 665 error = EINVAL; 666 goto error_exit; 667 } 668 669 /* 670 * Release the bootsector buffer. 671 */ 672 brelse(bp); 673 bp = NULL; 674 675 /* 676 * Check FSInfo. 677 */ 678 if (pmp->pm_fsinfo) { 679 struct fsinfo *fp; 680 681 if ((error = bread(devvp, pmp->pm_fsinfo, 1024, NOCRED, &bp)) != 0) 682 goto error_exit; 683 fp = (struct fsinfo *)bp->b_data; 684 if (!bcmp(fp->fsisig1, "RRaA", 4) 685 && !bcmp(fp->fsisig2, "rrAa", 4) 686 && !bcmp(fp->fsisig3, "\0\0\125\252", 4) 687 && !bcmp(fp->fsisig4, "\0\0\125\252", 4)) 688 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 689 else 690 pmp->pm_fsinfo = 0; 691 brelse(bp); 692 bp = NULL; 693 } 694 695 /* 696 * Check and validate (or perhaps invalidate?) the fsinfo structure? XXX 697 */ 698 699 /* 700 * Allocate memory for the bitmap of allocated clusters, and then 701 * fill it in. 702 */ 703 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 704 / N_INUSEBITS) 705 * sizeof(*pmp->pm_inusemap), 706 M_MSDOSFSFAT, M_WAITOK); 707 708 /* 709 * fillinusemap() needs pm_devvp. 710 */ 711 pmp->pm_dev = dev; 712 pmp->pm_devvp = devvp; 713 714 /* 715 * Have the inuse map filled in. 716 */ 717 if ((error = fillinusemap(pmp)) != 0) 718 goto error_exit; 719 720 /* 721 * If they want fat updates to be synchronous then let them suffer 722 * the performance degradation in exchange for the on disk copy of 723 * the fat being correct just about all the time. I suppose this 724 * would be a good thing to turn on if the kernel is still flakey. 725 */ 726 if (mp->mnt_flag & MNT_SYNCHRONOUS) 727 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 728 729 /* 730 * Finish up. 731 */ 732 if (ronly) 733 pmp->pm_flags |= MSDOSFSMNT_RONLY; 734 else 735 pmp->pm_fmod = 1; 736 mp->mnt_data = (qaddr_t) pmp; 737 mp->mnt_stat.f_fsid.val[0] = (long)dev; 738 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 739 mp->mnt_flag |= MNT_LOCAL; 740 devvp->v_specmountpoint = mp; 741 742 return 0; 743 744 error_exit: 745 if (bp) 746 brelse(bp); 747 (void) VOP_CLOSE(devvp, ronly ? FREAD : FREAD | FWRITE, NOCRED, p); 748 if (pmp) { 749 if (pmp->pm_inusemap) 750 free(pmp->pm_inusemap, M_MSDOSFSFAT); 751 free(pmp, M_MSDOSFSMNT); 752 mp->mnt_data = (qaddr_t)0; 753 } 754 return (error); 755 } 756 757 static int 758 msdosfs_start(mp, flags, p) 759 struct mount *mp; 760 int flags; 761 struct proc *p; 762 { 763 764 return (0); 765 } 766 767 /* 768 * Unmount the filesystem described by mp. 769 */ 770 static int 771 msdosfs_unmount(mp, mntflags, p) 772 struct mount *mp; 773 int mntflags; 774 struct proc *p; 775 { 776 struct msdosfsmount *pmp; 777 int error, flags; 778 779 flags = 0; 780 if (mntflags & MNT_FORCE) 781 flags |= FORCECLOSE; 782 error = vflush(mp, NULLVP, flags); 783 if (error) 784 return error; 785 pmp = VFSTOMSDOSFS(mp); 786 pmp->pm_devvp->v_specmountpoint = NULL; 787 #ifdef MSDOSFS_DEBUG 788 { 789 struct vnode *vp = pmp->pm_devvp; 790 791 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 792 printf("flag %08lx, usecount %d, writecount %d, holdcnt %ld\n", 793 vp->v_flag, vp->v_usecount, vp->v_writecount, vp->v_holdcnt); 794 printf("lastr %d, id %lu, mount %p, op %p\n", 795 vp->v_lastr, vp->v_id, vp->v_mount, vp->v_op); 796 printf("freef %p, freeb %p, mount %p\n", 797 vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev, 798 vp->v_mount); 799 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %ld, type %d\n", 800 TAILQ_FIRST(&vp->v_cleanblkhd), 801 TAILQ_FIRST(&vp->v_dirtyblkhd), 802 vp->v_numoutput, vp->v_type); 803 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 804 vp->v_socket, vp->v_tag, 805 ((u_int *)vp->v_data)[0], 806 ((u_int *)vp->v_data)[1]); 807 } 808 #endif 809 error = VOP_CLOSE(pmp->pm_devvp, 810 (pmp->pm_flags&MSDOSFSMNT_RONLY) ? FREAD : FREAD | FWRITE, 811 NOCRED, p); 812 vrele(pmp->pm_devvp); 813 free(pmp->pm_inusemap, M_MSDOSFSFAT); 814 free(pmp, M_MSDOSFSMNT); 815 mp->mnt_data = (qaddr_t)0; 816 mp->mnt_flag &= ~MNT_LOCAL; 817 return (error); 818 } 819 820 static int 821 msdosfs_root(mp, vpp) 822 struct mount *mp; 823 struct vnode **vpp; 824 { 825 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 826 struct denode *ndep; 827 int error; 828 829 #ifdef MSDOSFS_DEBUG 830 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 831 #endif 832 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep); 833 if (error) 834 return (error); 835 *vpp = DETOV(ndep); 836 return (0); 837 } 838 839 static int 840 msdosfs_quotactl(mp, cmds, uid, arg, p) 841 struct mount *mp; 842 int cmds; 843 uid_t uid; 844 caddr_t arg; 845 struct proc *p; 846 { 847 return EOPNOTSUPP; 848 } 849 850 static int 851 msdosfs_statfs(mp, sbp, p) 852 struct mount *mp; 853 struct statfs *sbp; 854 struct proc *p; 855 { 856 struct msdosfsmount *pmp; 857 858 pmp = VFSTOMSDOSFS(mp); 859 sbp->f_bsize = pmp->pm_bpcluster; 860 sbp->f_iosize = pmp->pm_bpcluster; 861 sbp->f_blocks = pmp->pm_nmbrofclusters; 862 sbp->f_bfree = pmp->pm_freeclustercount; 863 sbp->f_bavail = pmp->pm_freeclustercount; 864 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 865 sbp->f_ffree = 0; /* what to put in here? */ 866 if (sbp != &mp->mnt_stat) { 867 sbp->f_type = mp->mnt_vfc->vfc_typenum; 868 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 869 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 870 } 871 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN); 872 return (0); 873 } 874 875 static int 876 msdosfs_sync(mp, waitfor, cred, p) 877 struct mount *mp; 878 int waitfor; 879 struct ucred *cred; 880 struct proc *p; 881 { 882 struct vnode *vp, *nvp; 883 struct denode *dep; 884 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 885 int error, allerror = 0; 886 887 /* 888 * If we ever switch to not updating all of the fats all the time, 889 * this would be the place to update them from the first one. 890 */ 891 if (pmp->pm_fmod != 0) 892 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 893 panic("msdosfs_sync: rofs mod"); 894 else { 895 /* update fats here */ 896 } 897 /* 898 * Write back each (modified) denode. 899 */ 900 simple_lock(&mntvnode_slock); 901 loop: 902 for (vp = mp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) { 903 /* 904 * If the vnode that we are about to sync is no longer 905 * associated with this mount point, start over. 906 */ 907 if (vp->v_mount != mp) 908 goto loop; 909 910 simple_lock(&vp->v_interlock); 911 nvp = vp->v_mntvnodes.le_next; 912 dep = VTODE(vp); 913 if (vp->v_type == VNON || 914 (dep->de_flag & 915 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 && 916 (TAILQ_EMPTY(&vp->v_dirtyblkhd) || waitfor == MNT_LAZY)) { 917 simple_unlock(&vp->v_interlock); 918 continue; 919 } 920 simple_unlock(&mntvnode_slock); 921 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, p); 922 if (error) { 923 simple_lock(&mntvnode_slock); 924 if (error == ENOENT) 925 goto loop; 926 continue; 927 } 928 error = VOP_FSYNC(vp, cred, waitfor, p); 929 if (error) 930 allerror = error; 931 VOP_UNLOCK(vp, 0, p); 932 vrele(vp); 933 simple_lock(&mntvnode_slock); 934 } 935 simple_unlock(&mntvnode_slock); 936 937 /* 938 * Flush filesystem control info. 939 */ 940 if (waitfor != MNT_LAZY) { 941 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY, p); 942 error = VOP_FSYNC(pmp->pm_devvp, cred, waitfor, p); 943 if (error) 944 allerror = error; 945 VOP_UNLOCK(pmp->pm_devvp, 0, p); 946 } 947 return (allerror); 948 } 949 950 static int 951 msdosfs_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp) 952 struct mount *mp; 953 struct fid *fhp; 954 struct sockaddr *nam; 955 struct vnode **vpp; 956 int *exflagsp; 957 struct ucred **credanonp; 958 { 959 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 960 struct defid *defhp = (struct defid *) fhp; 961 struct denode *dep; 962 struct netcred *np; 963 int error; 964 965 np = vfs_export_lookup(mp, &pmp->pm_export, nam); 966 if (np == NULL) 967 return (EACCES); 968 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 969 if (error) { 970 *vpp = NULLVP; 971 return (error); 972 } 973 *vpp = DETOV(dep); 974 *exflagsp = np->netc_exflags; 975 *credanonp = &np->netc_anon; 976 return (0); 977 } 978 979 static int 980 msdosfs_vptofh(vp, fhp) 981 struct vnode *vp; 982 struct fid *fhp; 983 { 984 struct denode *dep; 985 struct defid *defhp; 986 987 dep = VTODE(vp); 988 defhp = (struct defid *)fhp; 989 defhp->defid_len = sizeof(struct defid); 990 defhp->defid_dirclust = dep->de_dirclust; 991 defhp->defid_dirofs = dep->de_diroffset; 992 /* defhp->defid_gen = dep->de_gen; */ 993 return (0); 994 } 995 996 static int 997 msdosfs_vget(mp, ino, vpp) 998 struct mount *mp; 999 ino_t ino; 1000 struct vnode **vpp; 1001 { 1002 return EOPNOTSUPP; 1003 } 1004 1005 static struct vfsops msdosfs_vfsops = { 1006 msdosfs_mount, 1007 msdosfs_start, 1008 msdosfs_unmount, 1009 msdosfs_root, 1010 msdosfs_quotactl, 1011 msdosfs_statfs, 1012 msdosfs_sync, 1013 msdosfs_vget, 1014 msdosfs_fhtovp, 1015 msdosfs_vptofh, 1016 msdosfs_init 1017 }; 1018 1019 VFS_SET(msdosfs_vfsops, msdos, 0); 1020