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sys/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 * 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 <sys/mount.h> 59 #include <sys/buf.h> 60 #include <sys/fcntl.h> 61 #include <sys/malloc.h> 62 #include <sys/stat.h> /* defines ALLPERMS */ 63 #include <vm/vm_zone.h> 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 #define MSDOSFS_DFLTBSIZE 4096 73 74 #if 1 /*def PC98*/ 75 /* 76 * XXX - The boot signature formatted by NEC PC-98 DOS looks like a 77 * garbage or a random value :-{ 78 * If you want to use that broken-signatured media, define the 79 * following symbol even though PC/AT. 80 * (ex. mount PC-98 DOS formatted FD on PC/AT) 81 */ 82 #define MSDOSFS_NOCHECKSIG 83 #endif 84 85 MALLOC_DEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOSFS mount structure"); 86 static MALLOC_DEFINE(M_MSDOSFSFAT, "MSDOSFS FAT", "MSDOSFS file allocation table"); 87 88 static int update_mp __P((struct mount *mp, struct msdosfs_args *argp)); 89 static int mountmsdosfs __P((struct vnode *devvp, struct mount *mp, 90 struct proc *p, struct msdosfs_args *argp)); 91 static int msdosfs_fhtovp __P((struct mount *, struct fid *, 92 struct vnode **)); 93 static int msdosfs_checkexp __P((struct mount *, struct sockaddr *, 94 int *, struct ucred **)); 95 static int msdosfs_mount __P((struct mount *, char *, caddr_t, 96 struct nameidata *, struct proc *)); 97 static int msdosfs_root __P((struct mount *, struct vnode **)); 98 static int msdosfs_statfs __P((struct mount *, struct statfs *, 99 struct proc *)); 100 static int msdosfs_sync __P((struct mount *, int, struct ucred *, 101 struct proc *)); 102 static int msdosfs_unmount __P((struct mount *, int, struct proc *)); 103 static int msdosfs_vptofh __P((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_dirmask = argp->dirmask & ALLPERMS; 117 pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT; 118 if (pmp->pm_flags & MSDOSFSMNT_U2WTABLE) { 119 bcopy(argp->u2w, pmp->pm_u2w, sizeof(pmp->pm_u2w)); 120 bcopy(argp->d2u, pmp->pm_d2u, sizeof(pmp->pm_d2u)); 121 bcopy(argp->u2d, pmp->pm_u2d, sizeof(pmp->pm_u2d)); 122 } 123 if (pmp->pm_flags & MSDOSFSMNT_ULTABLE) { 124 bcopy(argp->ul, pmp->pm_ul, sizeof(pmp->pm_ul)); 125 bcopy(argp->lu, pmp->pm_lu, sizeof(pmp->pm_lu)); 126 } 127 128 #ifndef __FreeBSD__ 129 /* 130 * GEMDOS knows nothing (yet) about win95 131 */ 132 if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS) 133 pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 134 #endif 135 136 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 137 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 138 else if (!(pmp->pm_flags & 139 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 140 struct vnode *rootvp; 141 142 /* 143 * Try to divine whether to support Win'95 long filenames 144 */ 145 if (FAT32(pmp)) 146 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 147 else { 148 if ((error = msdosfs_root(mp, &rootvp)) != 0) 149 return error; 150 pmp->pm_flags |= findwin95(VTODE(rootvp)) 151 ? MSDOSFSMNT_LONGNAME 152 : MSDOSFSMNT_SHORTNAME; 153 vput(rootvp); 154 } 155 } 156 return 0; 157 } 158 159 #ifndef __FreeBSD__ 160 int 161 msdosfs_mountroot() 162 { 163 register struct mount *mp; 164 struct proc *p = curproc; /* XXX */ 165 size_t size; 166 int error; 167 struct msdosfs_args args; 168 169 if (root_device->dv_class != DV_DISK) 170 return (ENODEV); 171 172 /* 173 * Get vnodes for swapdev and rootdev. 174 */ 175 if (bdevvp(rootdev, &rootvp)) 176 panic("msdosfs_mountroot: can't setup rootvp"); 177 178 mp = malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK); 179 bzero((char *)mp, (u_long)sizeof(struct mount)); 180 mp->mnt_op = &msdosfs_vfsops; 181 mp->mnt_flag = 0; 182 TAILQ_INIT(&mp->mnt_nvnodelist); 183 TAILQ_INIT(&mp->mnt_reservedvnlist); 184 185 args.flags = 0; 186 args.uid = 0; 187 args.gid = 0; 188 args.mask = args.dirmask = 0777; 189 190 if ((error = mountmsdosfs(rootvp, mp, p, &args)) != 0) { 191 free(mp, M_MOUNT); 192 return (error); 193 } 194 195 if ((error = update_mp(mp, &args)) != 0) { 196 (void)msdosfs_unmount(mp, 0, p); 197 free(mp, M_MOUNT); 198 return (error); 199 } 200 201 if ((error = vfs_lock(mp)) != 0) { 202 (void)msdosfs_unmount(mp, 0, p); 203 free(mp, M_MOUNT); 204 return (error); 205 } 206 207 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 208 mp->mnt_vnodecovered = NULLVP; 209 (void) copystr("/", mp->mnt_stat.f_mntonname, MNAMELEN - 1, 210 &size); 211 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 212 (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 213 &size); 214 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 215 (void)msdosfs_statfs(mp, &mp->mnt_stat, p); 216 vfs_unlock(mp); 217 return (0); 218 } 219 #endif 220 221 /* 222 * mp - path - addr in user space of mount point (ie /usr or whatever) 223 * data - addr in user space of mount params including the name of the block 224 * special file to treat as a filesystem. 225 */ 226 static int 227 msdosfs_mount(mp, path, data, ndp, p) 228 struct mount *mp; 229 char *path; 230 caddr_t data; 231 struct nameidata *ndp; 232 struct proc *p; 233 { 234 struct vnode *devvp; /* vnode for blk device to mount */ 235 struct msdosfs_args args; /* will hold data from mount request */ 236 /* msdosfs specific mount control block */ 237 struct msdosfsmount *pmp = NULL; 238 size_t size; 239 int error, flags; 240 mode_t accessmode; 241 242 error = copyin(data, (caddr_t)&args, sizeof(struct msdosfs_args)); 243 if (error) 244 return (error); 245 if (args.magic != MSDOSFS_ARGSMAGIC) 246 args.flags = 0; 247 /* 248 * If updating, check whether changing from read-only to 249 * read/write; if there is no device name, that's all we do. 250 */ 251 if (mp->mnt_flag & MNT_UPDATE) { 252 pmp = VFSTOMSDOSFS(mp); 253 error = 0; 254 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) { 255 flags = WRITECLOSE; 256 if (mp->mnt_flag & MNT_FORCE) 257 flags |= FORCECLOSE; 258 error = vflush(mp, 0, flags); 259 } 260 if (!error && (mp->mnt_flag & MNT_RELOAD)) 261 /* not yet implemented */ 262 error = EOPNOTSUPP; 263 if (error) 264 return (error); 265 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 266 /* 267 * If upgrade to read-write by non-root, then verify 268 * that user has necessary permissions on the device. 269 */ 270 if (p->p_ucred->cr_uid != 0) { 271 devvp = pmp->pm_devvp; 272 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p); 273 error = VOP_ACCESS(devvp, VREAD | VWRITE, 274 p->p_ucred, p); 275 if (error) { 276 VOP_UNLOCK(devvp, 0, p); 277 return (error); 278 } 279 VOP_UNLOCK(devvp, 0, p); 280 } 281 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 282 } 283 if (args.fspec == 0) { 284 #ifdef __notyet__ /* doesn't work correctly with current mountd XXX */ 285 if (args.flags & MSDOSFSMNT_MNTOPT) { 286 pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT; 287 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT; 288 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 289 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 290 } 291 #endif 292 /* 293 * Process export requests. 294 */ 295 return (vfs_export(mp, &pmp->pm_export, &args.export)); 296 } 297 } 298 /* 299 * Not an update, or updating the name: look up the name 300 * and verify that it refers to a sensible block device. 301 */ 302 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p); 303 error = namei(ndp); 304 if (error) 305 return (error); 306 devvp = ndp->ni_vp; 307 NDFREE(ndp, NDF_ONLY_PNBUF); 308 309 if (!vn_isdisk(devvp, &error)) { 310 vrele(devvp); 311 return (error); 312 } 313 /* 314 * If mount by non-root, then verify that user has necessary 315 * permissions on the device. 316 */ 317 if (p->p_ucred->cr_uid != 0) { 318 accessmode = VREAD; 319 if ((mp->mnt_flag & MNT_RDONLY) == 0) 320 accessmode |= VWRITE; 321 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p); 322 error = VOP_ACCESS(devvp, accessmode, p->p_ucred, p); 323 if (error) { 324 vput(devvp); 325 return (error); 326 } 327 VOP_UNLOCK(devvp, 0, p); 328 } 329 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 330 error = mountmsdosfs(devvp, mp, p, &args); 331 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 332 pmp = VFSTOMSDOSFS(mp); 333 #endif 334 } else { 335 if (devvp != pmp->pm_devvp) 336 error = EINVAL; /* XXX needs translation */ 337 else 338 vrele(devvp); 339 } 340 if (error) { 341 vrele(devvp); 342 return (error); 343 } 344 345 error = update_mp(mp, &args); 346 if (error) { 347 msdosfs_unmount(mp, MNT_FORCE, p); 348 return error; 349 } 350 351 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 352 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 353 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 354 &size); 355 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 356 (void) msdosfs_statfs(mp, &mp->mnt_stat, p); 357 #ifdef MSDOSFS_DEBUG 358 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 359 #endif 360 return (0); 361 } 362 363 static int 364 mountmsdosfs(devvp, mp, p, argp) 365 struct vnode *devvp; 366 struct mount *mp; 367 struct proc *p; 368 struct msdosfs_args *argp; 369 { 370 struct msdosfsmount *pmp; 371 struct buf *bp; 372 dev_t dev = devvp->v_rdev; 373 #ifndef __FreeBSD__ 374 struct partinfo dpart; 375 int bsize = 0, dtype = 0, tmp; 376 #endif 377 union bootsector *bsp; 378 struct byte_bpb33 *b33; 379 struct byte_bpb50 *b50; 380 struct byte_bpb710 *b710; 381 u_int8_t SecPerClust; 382 u_long clusters; 383 int ronly, error; 384 385 /* 386 * Disallow multiple mounts of the same device. 387 * Disallow mounting of a device that is currently in use 388 * (except for root, which might share swap device for miniroot). 389 * Flush out any old buffers remaining from a previous use. 390 */ 391 error = vfs_mountedon(devvp); 392 if (error) 393 return (error); 394 if (vcount(devvp) > 1 && devvp != rootvp) 395 return (EBUSY); 396 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p); 397 error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0); 398 VOP_UNLOCK(devvp, 0, p); 399 if (error) 400 return (error); 401 402 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 403 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p); 404 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p); 405 VOP_UNLOCK(devvp, 0, p); 406 if (error) 407 return (error); 408 409 bp = NULL; /* both used in error_exit */ 410 pmp = NULL; 411 412 #ifndef __FreeBSD__ 413 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 414 /* 415 * We need the disklabel to calculate the size of a FAT entry 416 * later on. Also make sure the partition contains a filesystem 417 * of type FS_MSDOS. This doesn't work for floppies, so we have 418 * to check for them too. 419 * 420 * At least some parts of the msdos fs driver seem to assume 421 * that the size of a disk block will always be 512 bytes. 422 * Let's check it... 423 */ 424 error = VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, 425 FREAD, NOCRED, p); 426 if (error) 427 goto error_exit; 428 tmp = dpart.part->p_fstype; 429 dtype = dpart.disklab->d_type; 430 bsize = dpart.disklab->d_secsize; 431 if (bsize != 512 || (dtype!=DTYPE_FLOPPY && tmp!=FS_MSDOS)) { 432 error = EINVAL; 433 goto error_exit; 434 } 435 } 436 #endif 437 438 /* 439 * Read the boot sector of the filesystem, and then check the 440 * boot signature. If not a dos boot sector then error out. 441 * 442 * NOTE: 2048 is a maximum sector size in current... 443 */ 444 error = bread(devvp, 0, 2048, NOCRED, &bp); 445 if (error) 446 goto error_exit; 447 bp->b_flags |= B_AGE; 448 bsp = (union bootsector *)bp->b_data; 449 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 450 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 451 b710 = (struct byte_bpb710 *)bsp->bs710.bsPBP; 452 453 #ifndef __FreeBSD__ 454 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 455 #endif 456 #ifndef MSDOSFS_NOCHECKSIG 457 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 458 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 459 error = EINVAL; 460 goto error_exit; 461 } 462 #endif 463 #ifndef __FreeBSD__ 464 } 465 #endif 466 467 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK); 468 bzero((caddr_t)pmp, sizeof *pmp); 469 pmp->pm_mountp = mp; 470 471 /* 472 * Compute several useful quantities from the bpb in the 473 * bootsector. Copy in the dos 5 variant of the bpb then fix up 474 * the fields that are different between dos 5 and dos 3.3. 475 */ 476 SecPerClust = b50->bpbSecPerClust; 477 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 478 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 479 pmp->pm_FATs = b50->bpbFATs; 480 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 481 pmp->pm_Sectors = getushort(b50->bpbSectors); 482 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 483 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 484 pmp->pm_Heads = getushort(b50->bpbHeads); 485 pmp->pm_Media = b50->bpbMedia; 486 487 /* calculate the ratio of sector size to DEV_BSIZE */ 488 pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE; 489 490 #ifndef __FreeBSD__ 491 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 492 #endif 493 /* XXX - We should probably check more values here */ 494 if (!pmp->pm_BytesPerSec || !SecPerClust 495 || !pmp->pm_Heads 496 #ifdef PC98 497 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 255) { 498 #else 499 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 63) { 500 #endif 501 error = EINVAL; 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 /* 549 * Check a few values (could do some more): 550 * - logical sector size: power of 2, >= block size 551 * - sectors per cluster: power of 2, >= 1 552 * - number of sectors: >= 1, <= size of partition 553 */ 554 if ( (SecPerClust == 0) 555 || (SecPerClust & (SecPerClust - 1)) 556 || (pmp->pm_BytesPerSec < DEV_BSIZE) 557 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 558 || (pmp->pm_HugeSectors == 0) 559 ) { 560 error = EINVAL; 561 goto error_exit; 562 } 563 564 pmp->pm_HugeSectors *= pmp->pm_BlkPerSec; 565 pmp->pm_HiddenSects *= pmp->pm_BlkPerSec; /* XXX not used? */ 566 pmp->pm_FATsecs *= pmp->pm_BlkPerSec; 567 SecPerClust *= pmp->pm_BlkPerSec; 568 569 pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec; 570 571 if (FAT32(pmp)) { 572 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 573 pmp->pm_firstcluster = pmp->pm_fatblk 574 + (pmp->pm_FATs * pmp->pm_FATsecs); 575 pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec; 576 } else { 577 pmp->pm_rootdirblk = pmp->pm_fatblk + 578 (pmp->pm_FATs * pmp->pm_FATsecs); 579 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 580 + DEV_BSIZE - 1) 581 / DEV_BSIZE; /* in blocks */ 582 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 583 } 584 585 pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 586 SecPerClust + 1; 587 pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE; /* XXX not used? */ 588 589 #ifndef __FreeBSD__ 590 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 591 if ((pmp->pm_maxcluster <= (0xff0 - 2)) 592 && ((dtype == DTYPE_FLOPPY) || ((dtype == DTYPE_VNODE) 593 && ((pmp->pm_Heads == 1) || (pmp->pm_Heads == 2)))) 594 ) { 595 pmp->pm_fatmask = FAT12_MASK; 596 pmp->pm_fatmult = 3; 597 pmp->pm_fatdiv = 2; 598 } else { 599 pmp->pm_fatmask = FAT16_MASK; 600 pmp->pm_fatmult = 2; 601 pmp->pm_fatdiv = 1; 602 } 603 } else 604 #endif 605 if (pmp->pm_fatmask == 0) { 606 if (pmp->pm_maxcluster 607 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 608 /* 609 * This will usually be a floppy disk. This size makes 610 * sure that one fat entry will not be split across 611 * multiple blocks. 612 */ 613 pmp->pm_fatmask = FAT12_MASK; 614 pmp->pm_fatmult = 3; 615 pmp->pm_fatdiv = 2; 616 } else { 617 pmp->pm_fatmask = FAT16_MASK; 618 pmp->pm_fatmult = 2; 619 pmp->pm_fatdiv = 1; 620 } 621 } 622 623 clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv; 624 if (pmp->pm_maxcluster >= clusters) { 625 printf("Warning: number of clusters (%ld) exceeds FAT " 626 "capacity (%ld)\n", pmp->pm_maxcluster + 1, clusters); 627 pmp->pm_maxcluster = clusters - 1; 628 } 629 630 631 if (FAT12(pmp)) 632 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 633 else 634 pmp->pm_fatblocksize = MSDOSFS_DFLTBSIZE; 635 636 pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE; 637 pmp->pm_bnshift = ffs(DEV_BSIZE) - 1; 638 639 /* 640 * Compute mask and shift value for isolating cluster relative byte 641 * offsets and cluster numbers from a file offset. 642 */ 643 pmp->pm_bpcluster = SecPerClust * DEV_BSIZE; 644 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 645 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 646 647 /* 648 * Check for valid cluster size 649 * must be a power of 2 650 */ 651 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 652 error = EINVAL; 653 goto error_exit; 654 } 655 656 /* 657 * Release the bootsector buffer. 658 */ 659 brelse(bp); 660 bp = NULL; 661 662 /* 663 * Check FSInfo. 664 */ 665 if (pmp->pm_fsinfo) { 666 struct fsinfo *fp; 667 668 if ((error = bread(devvp, pmp->pm_fsinfo, fsi_size(pmp), 669 NOCRED, &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 if (pmp->pm_nxtfree == 0xffffffff) 678 pmp->pm_nxtfree = CLUST_FIRST; 679 } else 680 pmp->pm_fsinfo = 0; 681 brelse(bp); 682 bp = NULL; 683 } 684 685 /* 686 * Check and validate (or perhaps invalidate?) the fsinfo structure? 687 */ 688 if (pmp->pm_fsinfo && pmp->pm_nxtfree > pmp->pm_maxcluster) { 689 printf( 690 "Next free cluster in FSInfo (%lu) exceeds maxcluster (%lu)\n", 691 pmp->pm_nxtfree, pmp->pm_maxcluster); 692 error = EINVAL; 693 goto error_exit; 694 } 695 696 /* 697 * Allocate memory for the bitmap of allocated clusters, and then 698 * fill it in. 699 */ 700 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 701 / N_INUSEBITS) 702 * sizeof(*pmp->pm_inusemap), 703 M_MSDOSFSFAT, M_WAITOK); 704 705 /* 706 * fillinusemap() needs pm_devvp. 707 */ 708 pmp->pm_dev = dev; 709 pmp->pm_devvp = devvp; 710 711 /* 712 * Have the inuse map filled in. 713 */ 714 if ((error = fillinusemap(pmp)) != 0) 715 goto error_exit; 716 717 /* 718 * If they want fat updates to be synchronous then let them suffer 719 * the performance degradation in exchange for the on disk copy of 720 * the fat being correct just about all the time. I suppose this 721 * would be a good thing to turn on if the kernel is still flakey. 722 */ 723 if (mp->mnt_flag & MNT_SYNCHRONOUS) 724 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 725 726 /* 727 * Finish up. 728 */ 729 if (ronly) 730 pmp->pm_flags |= MSDOSFSMNT_RONLY; 731 else 732 pmp->pm_fmod = 1; 733 mp->mnt_data = (qaddr_t) pmp; 734 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 735 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 736 mp->mnt_flag |= MNT_LOCAL; 737 devvp->v_specmountpoint = mp; 738 739 return 0; 740 741 error_exit: 742 if (bp) 743 brelse(bp); 744 (void) VOP_CLOSE(devvp, ronly ? FREAD : FREAD | FWRITE, NOCRED, p); 745 if (pmp) { 746 if (pmp->pm_inusemap) 747 free(pmp->pm_inusemap, M_MSDOSFSFAT); 748 free(pmp, M_MSDOSFSMNT); 749 mp->mnt_data = (qaddr_t)0; 750 } 751 return (error); 752 } 753 754 /* 755 * Unmount the filesystem described by mp. 756 */ 757 static int 758 msdosfs_unmount(mp, mntflags, p) 759 struct mount *mp; 760 int mntflags; 761 struct proc *p; 762 { 763 struct msdosfsmount *pmp; 764 int error, flags; 765 766 flags = 0; 767 if (mntflags & MNT_FORCE) 768 flags |= FORCECLOSE; 769 error = vflush(mp, 0, flags); 770 if (error) 771 return error; 772 pmp = VFSTOMSDOSFS(mp); 773 pmp->pm_devvp->v_specmountpoint = NULL; 774 #ifdef MSDOSFS_DEBUG 775 { 776 struct vnode *vp = pmp->pm_devvp; 777 778 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 779 printf("flag %08lx, usecount %d, writecount %d, holdcnt %ld\n", 780 vp->v_flag, vp->v_usecount, vp->v_writecount, vp->v_holdcnt); 781 printf("id %lu, mount %p, op %p\n", 782 vp->v_id, vp->v_mount, vp->v_op); 783 printf("freef %p, freeb %p, mount %p\n", 784 vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev, 785 vp->v_mount); 786 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %ld, type %d\n", 787 TAILQ_FIRST(&vp->v_cleanblkhd), 788 TAILQ_FIRST(&vp->v_dirtyblkhd), 789 vp->v_numoutput, vp->v_type); 790 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 791 vp->v_socket, vp->v_tag, 792 ((u_int *)vp->v_data)[0], 793 ((u_int *)vp->v_data)[1]); 794 } 795 #endif 796 error = VOP_CLOSE(pmp->pm_devvp, 797 (pmp->pm_flags&MSDOSFSMNT_RONLY) ? FREAD : FREAD | FWRITE, 798 NOCRED, p); 799 vrele(pmp->pm_devvp); 800 free(pmp->pm_inusemap, M_MSDOSFSFAT); 801 free(pmp, M_MSDOSFSMNT); 802 mp->mnt_data = (qaddr_t)0; 803 mp->mnt_flag &= ~MNT_LOCAL; 804 return (error); 805 } 806 807 static int 808 msdosfs_root(mp, vpp) 809 struct mount *mp; 810 struct vnode **vpp; 811 { 812 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 813 struct denode *ndep; 814 int error; 815 816 #ifdef MSDOSFS_DEBUG 817 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 818 #endif 819 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep); 820 if (error) 821 return (error); 822 *vpp = DETOV(ndep); 823 return (0); 824 } 825 826 static int 827 msdosfs_statfs(mp, sbp, p) 828 struct mount *mp; 829 struct statfs *sbp; 830 struct proc *p; 831 { 832 struct msdosfsmount *pmp; 833 834 pmp = VFSTOMSDOSFS(mp); 835 sbp->f_bsize = pmp->pm_bpcluster; 836 sbp->f_iosize = pmp->pm_bpcluster; 837 sbp->f_blocks = pmp->pm_maxcluster + 1; 838 sbp->f_bfree = pmp->pm_freeclustercount; 839 sbp->f_bavail = pmp->pm_freeclustercount; 840 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 841 sbp->f_ffree = 0; /* what to put in here? */ 842 if (sbp != &mp->mnt_stat) { 843 sbp->f_type = mp->mnt_vfc->vfc_typenum; 844 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 845 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 846 } 847 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN); 848 return (0); 849 } 850 851 static int 852 msdosfs_sync(mp, waitfor, cred, p) 853 struct mount *mp; 854 int waitfor; 855 struct ucred *cred; 856 struct proc *p; 857 { 858 struct vnode *vp, *nvp; 859 struct denode *dep; 860 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 861 int error, allerror = 0; 862 863 /* 864 * If we ever switch to not updating all of the fats all the time, 865 * this would be the place to update them from the first one. 866 */ 867 if (pmp->pm_fmod != 0) { 868 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 869 panic("msdosfs_sync: rofs mod"); 870 else { 871 /* update fats here */ 872 } 873 } 874 /* 875 * Write back each (modified) denode. 876 */ 877 simple_lock(&mntvnode_slock); 878 loop: 879 for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist); vp != NULL; vp = nvp) { 880 /* 881 * If the vnode that we are about to sync is no longer 882 * associated with this mount point, start over. 883 */ 884 if (vp->v_mount != mp) 885 goto loop; 886 887 simple_lock(&vp->v_interlock); 888 nvp = TAILQ_NEXT(vp, v_nmntvnodes); 889 dep = VTODE(vp); 890 if (vp->v_type == VNON || 891 ((dep->de_flag & 892 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 && 893 (TAILQ_EMPTY(&vp->v_dirtyblkhd) || waitfor == MNT_LAZY))) { 894 simple_unlock(&vp->v_interlock); 895 continue; 896 } 897 simple_unlock(&mntvnode_slock); 898 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, p); 899 if (error) { 900 simple_lock(&mntvnode_slock); 901 if (error == ENOENT) 902 goto loop; 903 continue; 904 } 905 error = VOP_FSYNC(vp, cred, waitfor, p); 906 if (error) 907 allerror = error; 908 VOP_UNLOCK(vp, 0, p); 909 vrele(vp); 910 simple_lock(&mntvnode_slock); 911 } 912 simple_unlock(&mntvnode_slock); 913 914 /* 915 * Flush filesystem control info. 916 */ 917 if (waitfor != MNT_LAZY) { 918 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY, p); 919 error = VOP_FSYNC(pmp->pm_devvp, cred, waitfor, p); 920 if (error) 921 allerror = error; 922 VOP_UNLOCK(pmp->pm_devvp, 0, p); 923 } 924 return (allerror); 925 } 926 927 static int 928 msdosfs_fhtovp(mp, fhp, vpp) 929 struct mount *mp; 930 struct fid *fhp; 931 struct vnode **vpp; 932 { 933 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 934 struct defid *defhp = (struct defid *) fhp; 935 struct denode *dep; 936 int error; 937 938 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 939 if (error) { 940 *vpp = NULLVP; 941 return (error); 942 } 943 *vpp = DETOV(dep); 944 return (0); 945 } 946 947 static int 948 msdosfs_checkexp(mp, nam, exflagsp, credanonp) 949 struct mount *mp; 950 struct sockaddr *nam; 951 int *exflagsp; 952 struct ucred **credanonp; 953 { 954 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 955 struct netcred *np; 956 957 np = vfs_export_lookup(mp, &pmp->pm_export, nam); 958 if (np == NULL) 959 return (EACCES); 960 *exflagsp = np->netc_exflags; 961 *credanonp = &np->netc_anon; 962 return (0); 963 } 964 965 static int 966 msdosfs_vptofh(vp, fhp) 967 struct vnode *vp; 968 struct fid *fhp; 969 { 970 struct denode *dep; 971 struct defid *defhp; 972 973 dep = VTODE(vp); 974 defhp = (struct defid *)fhp; 975 defhp->defid_len = sizeof(struct defid); 976 defhp->defid_dirclust = dep->de_dirclust; 977 defhp->defid_dirofs = dep->de_diroffset; 978 /* defhp->defid_gen = dep->de_gen; */ 979 return (0); 980 } 981 982 static struct vfsops msdosfs_vfsops = { 983 msdosfs_mount, 984 vfs_stdstart, 985 msdosfs_unmount, 986 msdosfs_root, 987 vfs_stdquotactl, 988 msdosfs_statfs, 989 msdosfs_sync, 990 vfs_stdvget, 991 msdosfs_fhtovp, 992 msdosfs_checkexp, 993 msdosfs_vptofh, 994 msdosfs_init, 995 msdosfs_uninit, 996 vfs_stdextattrctl, 997 }; 998 999 VFS_SET(msdosfs_vfsops, msdos, 0);
Cache object: c1fbf645b7010a5a9c1c264352fd1dd9
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