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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 <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 #if 1 /*def PC98*/ 73 /* 74 * XXX - The boot signature formatted by NEC PC-98 DOS looks like a 75 * garbage or a random value :-{ 76 * If you want to use that broken-signatured media, define the 77 * following symbol even though PC/AT. 78 * (ex. mount PC-98 DOS formatted FD on PC/AT) 79 */ 80 #define MSDOSFS_NOCHECKSIG 81 #endif 82 83 MALLOC_DEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOSFS mount structure"); 84 static MALLOC_DEFINE(M_MSDOSFSFAT, "MSDOSFS FAT", "MSDOSFS file allocation table"); 85 86 static int update_mp __P((struct mount *mp, struct msdosfs_args *argp)); 87 static int mountmsdosfs __P((struct vnode *devvp, struct mount *mp, 88 struct proc *p, struct msdosfs_args *argp)); 89 static int msdosfs_fhtovp __P((struct mount *, struct fid *, 90 struct sockaddr *, struct vnode **, int *, 91 struct ucred **)); 92 static int msdosfs_mount __P((struct mount *, char *, caddr_t, 93 struct nameidata *, struct proc *)); 94 static int msdosfs_quotactl __P((struct mount *, int, uid_t, caddr_t, 95 struct proc *)); 96 static int msdosfs_root __P((struct mount *, struct vnode **)); 97 static int msdosfs_start __P((struct mount *, int, struct proc *)); 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_vget __P((struct mount *mp, ino_t ino, 104 struct vnode **vpp)); 105 static int msdosfs_vptofh __P((struct vnode *, struct fid *)); 106 107 static int 108 update_mp(mp, argp) 109 struct mount *mp; 110 struct msdosfs_args *argp; 111 { 112 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 113 int error; 114 115 pmp->pm_gid = argp->gid; 116 pmp->pm_uid = argp->uid; 117 pmp->pm_mask = argp->mask & ALLPERMS; 118 pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT; 119 if (pmp->pm_flags & MSDOSFSMNT_U2WTABLE) { 120 bcopy(argp->u2w, pmp->pm_u2w, sizeof(pmp->pm_u2w)); 121 bcopy(argp->d2u, pmp->pm_d2u, sizeof(pmp->pm_d2u)); 122 bcopy(argp->u2d, pmp->pm_u2d, sizeof(pmp->pm_u2d)); 123 } 124 if (pmp->pm_flags & MSDOSFSMNT_ULTABLE) { 125 bcopy(argp->ul, pmp->pm_ul, sizeof(pmp->pm_ul)); 126 bcopy(argp->lu, pmp->pm_lu, sizeof(pmp->pm_lu)); 127 } 128 129 #ifndef __FreeBSD__ 130 /* 131 * GEMDOS knows nothing (yet) about win95 132 */ 133 if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS) 134 pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 135 #endif 136 137 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 138 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 139 else if (!(pmp->pm_flags & 140 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 141 struct vnode *rootvp; 142 143 /* 144 * Try to divine whether to support Win'95 long filenames 145 */ 146 if (FAT32(pmp)) 147 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 148 else { 149 if ((error = msdosfs_root(mp, &rootvp)) != 0) 150 return error; 151 pmp->pm_flags |= findwin95(VTODE(rootvp)) 152 ? MSDOSFSMNT_LONGNAME 153 : MSDOSFSMNT_SHORTNAME; 154 vput(rootvp); 155 } 156 } 157 return 0; 158 } 159 160 #ifndef __FreeBSD__ 161 int 162 msdosfs_mountroot() 163 { 164 register struct mount *mp; 165 struct proc *p = curproc; /* XXX */ 166 size_t size; 167 int error; 168 struct msdosfs_args args; 169 170 if (root_device->dv_class != DV_DISK) 171 return (ENODEV); 172 173 /* 174 * Get vnodes for swapdev and rootdev. 175 */ 176 if (bdevvp(rootdev, &rootvp)) 177 panic("msdosfs_mountroot: can't setup rootvp"); 178 179 mp = malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK); 180 bzero((char *)mp, (u_long)sizeof(struct mount)); 181 mp->mnt_op = &msdosfs_vfsops; 182 mp->mnt_flag = 0; 183 LIST_INIT(&mp->mnt_vnodelist); 184 185 args.flags = 0; 186 args.uid = 0; 187 args.gid = 0; 188 args.mask = 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 CIRCLEQ_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, NULLVP, 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; 307 308 if (devvp->v_type != VBLK) { 309 vrele(devvp); 310 return (ENOTBLK); 311 } 312 if (major(devvp->v_rdev) >= nblkdev || 313 bdevsw[major(devvp->v_rdev)] == NULL) { 314 vrele(devvp); 315 return (ENXIO); 316 } 317 /* 318 * If mount by non-root, then verify that user has necessary 319 * permissions on the device. 320 */ 321 if (p->p_ucred->cr_uid != 0) { 322 accessmode = VREAD; 323 if ((mp->mnt_flag & MNT_RDONLY) == 0) 324 accessmode |= VWRITE; 325 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p); 326 error = VOP_ACCESS(devvp, accessmode, p->p_ucred, p); 327 if (error) { 328 vput(devvp); 329 return (error); 330 } 331 VOP_UNLOCK(devvp, 0, p); 332 } 333 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 334 error = mountmsdosfs(devvp, mp, p, &args); 335 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 336 pmp = VFSTOMSDOSFS(mp); 337 #endif 338 } else { 339 if (devvp != pmp->pm_devvp) 340 error = EINVAL; /* XXX needs translation */ 341 else 342 vrele(devvp); 343 } 344 if (error) { 345 vrele(devvp); 346 return (error); 347 } 348 349 error = update_mp(mp, &args); 350 if (error) { 351 msdosfs_unmount(mp, MNT_FORCE, p); 352 return error; 353 } 354 355 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 356 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 357 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 358 &size); 359 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 360 (void) msdosfs_statfs(mp, &mp->mnt_stat, p); 361 #ifdef MSDOSFS_DEBUG 362 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 363 #endif 364 return (0); 365 } 366 367 static int 368 mountmsdosfs(devvp, mp, p, argp) 369 struct vnode *devvp; 370 struct mount *mp; 371 struct proc *p; 372 struct msdosfs_args *argp; 373 { 374 struct msdosfsmount *pmp; 375 struct buf *bp; 376 dev_t dev = devvp->v_rdev; 377 #ifndef __FreeBSD__ 378 struct partinfo dpart; 379 int bsize = 0, dtype = 0, tmp; 380 #endif 381 union bootsector *bsp; 382 struct byte_bpb33 *b33; 383 struct byte_bpb50 *b50; 384 struct byte_bpb710 *b710; 385 u_int8_t SecPerClust; 386 int ronly, error; 387 388 /* 389 * Disallow multiple mounts of the same device. 390 * Disallow mounting of a device that is currently in use 391 * (except for root, which might share swap device for miniroot). 392 * Flush out any old buffers remaining from a previous use. 393 */ 394 error = vfs_mountedon(devvp); 395 if (error) 396 return (error); 397 if (vcount(devvp) > 1 && devvp != rootvp) 398 return (EBUSY); 399 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p); 400 error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0); 401 VOP_UNLOCK(devvp, 0, p); 402 if (error) 403 return (error); 404 405 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 406 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p); 407 if (error) 408 return (error); 409 410 bp = NULL; /* both used in error_exit */ 411 pmp = NULL; 412 413 #ifndef __FreeBSD__ 414 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 415 /* 416 * We need the disklabel to calculate the size of a FAT entry 417 * later on. Also make sure the partition contains a filesystem 418 * of type FS_MSDOS. This doesn't work for floppies, so we have 419 * to check for them too. 420 * 421 * At least some parts of the msdos fs driver seem to assume 422 * that the size of a disk block will always be 512 bytes. 423 * Let's check it... 424 */ 425 error = VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, 426 FREAD, NOCRED, p); 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, NOCRED, &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 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_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 586 SecPerClust; 587 pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 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_nmbrofclusters <= (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 if (FAT12(pmp)) 624 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 625 else 626 pmp->pm_fatblocksize = DFLTBSIZE; 627 628 pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE; 629 pmp->pm_bnshift = ffs(DEV_BSIZE) - 1; 630 631 /* 632 * Compute mask and shift value for isolating cluster relative byte 633 * offsets and cluster numbers from a file offset. 634 */ 635 pmp->pm_bpcluster = SecPerClust * DEV_BSIZE; 636 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 637 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 638 639 /* 640 * Check for valid cluster size 641 * must be a power of 2 642 */ 643 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 644 error = EINVAL; 645 goto error_exit; 646 } 647 648 /* 649 * Release the bootsector buffer. 650 */ 651 brelse(bp); 652 bp = NULL; 653 654 /* 655 * Check FSInfo. 656 */ 657 if (pmp->pm_fsinfo) { 658 struct fsinfo *fp; 659 660 if ((error = bread(devvp, pmp->pm_fsinfo, fsi_size(pmp), 661 NOCRED, &bp)) != 0) 662 goto error_exit; 663 fp = (struct fsinfo *)bp->b_data; 664 if (!bcmp(fp->fsisig1, "RRaA", 4) 665 && !bcmp(fp->fsisig2, "rrAa", 4) 666 && !bcmp(fp->fsisig3, "\0\0\125\252", 4) 667 && !bcmp(fp->fsisig4, "\0\0\125\252", 4)) 668 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 669 else 670 pmp->pm_fsinfo = 0; 671 brelse(bp); 672 bp = NULL; 673 } 674 675 /* 676 * Check and validate (or perhaps invalidate?) the fsinfo structure? XXX 677 */ 678 679 /* 680 * Allocate memory for the bitmap of allocated clusters, and then 681 * fill it in. 682 */ 683 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 684 / N_INUSEBITS) 685 * sizeof(*pmp->pm_inusemap), 686 M_MSDOSFSFAT, M_WAITOK); 687 688 /* 689 * fillinusemap() needs pm_devvp. 690 */ 691 pmp->pm_dev = dev; 692 pmp->pm_devvp = devvp; 693 694 /* 695 * Have the inuse map filled in. 696 */ 697 if ((error = fillinusemap(pmp)) != 0) 698 goto error_exit; 699 700 /* 701 * If they want fat updates to be synchronous then let them suffer 702 * the performance degradation in exchange for the on disk copy of 703 * the fat being correct just about all the time. I suppose this 704 * would be a good thing to turn on if the kernel is still flakey. 705 */ 706 if (mp->mnt_flag & MNT_SYNCHRONOUS) 707 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 708 709 /* 710 * Finish up. 711 */ 712 if (ronly) 713 pmp->pm_flags |= MSDOSFSMNT_RONLY; 714 else 715 pmp->pm_fmod = 1; 716 mp->mnt_data = (qaddr_t) pmp; 717 mp->mnt_stat.f_fsid.val[0] = (long)dev; 718 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 719 mp->mnt_flag |= MNT_LOCAL; 720 devvp->v_specmountpoint = mp; 721 722 return 0; 723 724 error_exit: 725 if (bp) 726 brelse(bp); 727 (void) VOP_CLOSE(devvp, ronly ? FREAD : FREAD | FWRITE, NOCRED, p); 728 if (pmp) { 729 if (pmp->pm_inusemap) 730 free(pmp->pm_inusemap, M_MSDOSFSFAT); 731 free(pmp, M_MSDOSFSMNT); 732 mp->mnt_data = (qaddr_t)0; 733 } 734 return (error); 735 } 736 737 static int 738 msdosfs_start(mp, flags, p) 739 struct mount *mp; 740 int flags; 741 struct proc *p; 742 { 743 744 return (0); 745 } 746 747 /* 748 * Unmount the filesystem described by mp. 749 */ 750 static int 751 msdosfs_unmount(mp, mntflags, p) 752 struct mount *mp; 753 int mntflags; 754 struct proc *p; 755 { 756 struct msdosfsmount *pmp; 757 int error, flags; 758 759 flags = 0; 760 if (mntflags & MNT_FORCE) 761 flags |= FORCECLOSE; 762 error = vflush(mp, NULLVP, flags); 763 if (error) 764 return error; 765 pmp = VFSTOMSDOSFS(mp); 766 pmp->pm_devvp->v_specmountpoint = NULL; 767 #ifdef MSDOSFS_DEBUG 768 { 769 struct vnode *vp = pmp->pm_devvp; 770 771 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 772 printf("flag %08lx, usecount %d, writecount %d, holdcnt %ld\n", 773 vp->v_flag, vp->v_usecount, vp->v_writecount, vp->v_holdcnt); 774 printf("lastr %d, id %lu, mount %p, op %p\n", 775 vp->v_lastr, vp->v_id, vp->v_mount, vp->v_op); 776 printf("freef %p, freeb %p, mount %p\n", 777 vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev, 778 vp->v_mount); 779 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %ld, type %d\n", 780 TAILQ_FIRST(&vp->v_cleanblkhd), 781 TAILQ_FIRST(&vp->v_dirtyblkhd), 782 vp->v_numoutput, vp->v_type); 783 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 784 vp->v_socket, vp->v_tag, 785 ((u_int *)vp->v_data)[0], 786 ((u_int *)vp->v_data)[1]); 787 } 788 #endif 789 error = VOP_CLOSE(pmp->pm_devvp, 790 (pmp->pm_flags&MSDOSFSMNT_RONLY) ? FREAD : FREAD | FWRITE, 791 NOCRED, p); 792 vrele(pmp->pm_devvp); 793 free(pmp->pm_inusemap, M_MSDOSFSFAT); 794 free(pmp, M_MSDOSFSMNT); 795 mp->mnt_data = (qaddr_t)0; 796 mp->mnt_flag &= ~MNT_LOCAL; 797 return (error); 798 } 799 800 static int 801 msdosfs_root(mp, vpp) 802 struct mount *mp; 803 struct vnode **vpp; 804 { 805 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 806 struct denode *ndep; 807 int error; 808 809 #ifdef MSDOSFS_DEBUG 810 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 811 #endif 812 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep); 813 if (error) 814 return (error); 815 *vpp = DETOV(ndep); 816 return (0); 817 } 818 819 static int 820 msdosfs_quotactl(mp, cmds, uid, arg, p) 821 struct mount *mp; 822 int cmds; 823 uid_t uid; 824 caddr_t arg; 825 struct proc *p; 826 { 827 return EOPNOTSUPP; 828 } 829 830 static int 831 msdosfs_statfs(mp, sbp, p) 832 struct mount *mp; 833 struct statfs *sbp; 834 struct proc *p; 835 { 836 struct msdosfsmount *pmp; 837 838 pmp = VFSTOMSDOSFS(mp); 839 sbp->f_bsize = pmp->pm_bpcluster; 840 sbp->f_iosize = pmp->pm_bpcluster; 841 sbp->f_blocks = pmp->pm_nmbrofclusters; 842 sbp->f_bfree = pmp->pm_freeclustercount; 843 sbp->f_bavail = pmp->pm_freeclustercount; 844 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 845 sbp->f_ffree = 0; /* what to put in here? */ 846 if (sbp != &mp->mnt_stat) { 847 sbp->f_type = mp->mnt_vfc->vfc_typenum; 848 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 849 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 850 } 851 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN); 852 return (0); 853 } 854 855 static int 856 msdosfs_sync(mp, waitfor, cred, p) 857 struct mount *mp; 858 int waitfor; 859 struct ucred *cred; 860 struct proc *p; 861 { 862 struct vnode *vp, *nvp; 863 struct denode *dep; 864 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 865 int error, allerror = 0; 866 867 /* 868 * If we ever switch to not updating all of the fats all the time, 869 * this would be the place to update them from the first one. 870 */ 871 if (pmp->pm_fmod != 0) 872 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 873 panic("msdosfs_sync: rofs mod"); 874 else { 875 /* update fats here */ 876 } 877 /* 878 * Write back each (modified) denode. 879 */ 880 simple_lock(&mntvnode_slock); 881 loop: 882 for (vp = mp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) { 883 /* 884 * If the vnode that we are about to sync is no longer 885 * associated with this mount point, start over. 886 */ 887 if (vp->v_mount != mp) 888 goto loop; 889 890 simple_lock(&vp->v_interlock); 891 nvp = vp->v_mntvnodes.le_next; 892 dep = VTODE(vp); 893 if (vp->v_type == VNON || 894 (dep->de_flag & 895 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 && 896 (TAILQ_EMPTY(&vp->v_dirtyblkhd) || waitfor == MNT_LAZY)) { 897 simple_unlock(&vp->v_interlock); 898 continue; 899 } 900 simple_unlock(&mntvnode_slock); 901 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, p); 902 if (error) { 903 simple_lock(&mntvnode_slock); 904 if (error == ENOENT) 905 goto loop; 906 continue; 907 } 908 error = VOP_FSYNC(vp, cred, waitfor, p); 909 if (error) 910 allerror = error; 911 VOP_UNLOCK(vp, 0, p); 912 vrele(vp); 913 simple_lock(&mntvnode_slock); 914 } 915 simple_unlock(&mntvnode_slock); 916 917 /* 918 * Flush filesystem control info. 919 */ 920 if (waitfor != MNT_LAZY) { 921 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY, p); 922 error = VOP_FSYNC(pmp->pm_devvp, cred, waitfor, p); 923 if (error) 924 allerror = error; 925 VOP_UNLOCK(pmp->pm_devvp, 0, p); 926 } 927 return (allerror); 928 } 929 930 static int 931 msdosfs_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp) 932 struct mount *mp; 933 struct fid *fhp; 934 struct sockaddr *nam; 935 struct vnode **vpp; 936 int *exflagsp; 937 struct ucred **credanonp; 938 { 939 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 940 struct defid *defhp = (struct defid *) fhp; 941 struct denode *dep; 942 struct netcred *np; 943 int error; 944 945 np = vfs_export_lookup(mp, &pmp->pm_export, nam); 946 if (np == NULL) 947 return (EACCES); 948 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 949 if (error) { 950 *vpp = NULLVP; 951 return (error); 952 } 953 *vpp = DETOV(dep); 954 *exflagsp = np->netc_exflags; 955 *credanonp = &np->netc_anon; 956 return (0); 957 } 958 959 static int 960 msdosfs_vptofh(vp, fhp) 961 struct vnode *vp; 962 struct fid *fhp; 963 { 964 struct denode *dep; 965 struct defid *defhp; 966 967 dep = VTODE(vp); 968 defhp = (struct defid *)fhp; 969 defhp->defid_len = sizeof(struct defid); 970 defhp->defid_dirclust = dep->de_dirclust; 971 defhp->defid_dirofs = dep->de_diroffset; 972 /* defhp->defid_gen = dep->de_gen; */ 973 return (0); 974 } 975 976 static int 977 msdosfs_vget(mp, ino, vpp) 978 struct mount *mp; 979 ino_t ino; 980 struct vnode **vpp; 981 { 982 return EOPNOTSUPP; 983 } 984 985 static struct vfsops msdosfs_vfsops = { 986 msdosfs_mount, 987 msdosfs_start, 988 msdosfs_unmount, 989 msdosfs_root, 990 msdosfs_quotactl, 991 msdosfs_statfs, 992 msdosfs_sync, 993 msdosfs_vget, 994 msdosfs_fhtovp, 995 msdosfs_vptofh, 996 msdosfs_init 997 }; 998 999 VFS_SET(msdosfs_vfsops, msdos, 0);
Cache object: 2a9395a60adcdeff1164b50ca2b26e5d
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