1 /* $OpenBSD: msdosfs_vfsops.c,v 1.31 2003/04/14 17:55:07 tedu Exp $ */ 2 /* $NetBSD: msdosfs_vfsops.c,v 1.48 1997/10/18 02:54:57 briggs 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/namei.h> 54 #include <sys/proc.h> 55 #include <sys/kernel.h> 56 #include <sys/vnode.h> 57 #include <miscfs/specfs/specdev.h> /* XXX */ /* defines v_rdev */ 58 #include <sys/mount.h> 59 #include <sys/buf.h> 60 #include <sys/file.h> 61 #include <sys/disklabel.h> 62 #include <sys/ioctl.h> 63 #include <sys/malloc.h> 64 #include <sys/dirent.h> 65 66 #include <msdosfs/bpb.h> 67 #include <msdosfs/bootsect.h> 68 #include <msdosfs/direntry.h> 69 #include <msdosfs/denode.h> 70 #include <msdosfs/msdosfsmount.h> 71 #include <msdosfs/fat.h> 72 73 int msdosfs_mount(struct mount *, const char *, void *, struct nameidata *, 74 struct proc *); 75 int msdosfs_start(struct mount *, int, struct proc *); 76 int msdosfs_unmount(struct mount *, int, struct proc *); 77 int msdosfs_root(struct mount *, struct vnode **); 78 int msdosfs_statfs(struct mount *, struct statfs *, struct proc *); 79 int msdosfs_sync(struct mount *, int, struct ucred *, struct proc *); 80 int msdosfs_fhtovp(struct mount *, struct fid *, struct vnode **); 81 int msdosfs_vptofh(struct vnode *, struct fid *); 82 int msdosfs_check_export(struct mount *mp, struct mbuf *nam, 83 int *extflagsp, struct ucred **credanonp); 84 85 int msdosfs_mountfs(struct vnode *, struct mount *, struct proc *, 86 struct msdosfs_args *); 87 88 int msdosfs_sync_vnode(struct vnode *, void *); 89 90 /* 91 * mp - path - addr in user space of mount point (ie /usr or whatever) 92 * data - addr in user space of mount params including the name of the block 93 * special file to treat as a filesystem. 94 */ 95 int 96 msdosfs_mount(mp, path, data, ndp, p) 97 struct mount *mp; 98 const char *path; 99 void *data; 100 struct nameidata *ndp; 101 struct proc *p; 102 { 103 struct vnode *devvp; /* vnode for blk device to mount */ 104 struct msdosfs_args args; /* will hold data from mount request */ 105 /* msdosfs specific mount control block */ 106 struct msdosfsmount *pmp = NULL; 107 size_t size; 108 int error, flags; 109 mode_t accessmode; 110 111 error = copyin(data, &args, sizeof(struct msdosfs_args)); 112 if (error) 113 return (error); 114 /* 115 * If updating, check whether changing from read-only to 116 * read/write; if there is no device name, that's all we do. 117 */ 118 if (mp->mnt_flag & MNT_UPDATE) { 119 pmp = VFSTOMSDOSFS(mp); 120 error = 0; 121 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) { 122 flags = WRITECLOSE; 123 if (mp->mnt_flag & MNT_FORCE) 124 flags |= FORCECLOSE; 125 error = vflush(mp, NULLVP, flags); 126 } 127 if (!error && (mp->mnt_flag & MNT_RELOAD)) 128 /* not yet implemented */ 129 error = EOPNOTSUPP; 130 if (error) 131 return (error); 132 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_WANTRDWR)) { 133 /* 134 * If upgrade to read-write by non-root, then verify 135 * that user has necessary permissions on the device. 136 */ 137 if (p->p_ucred->cr_uid != 0) { 138 devvp = pmp->pm_devvp; 139 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p); 140 error = VOP_ACCESS(devvp, VREAD | VWRITE, 141 p->p_ucred, p); 142 if (error) { 143 VOP_UNLOCK(devvp, 0, p); 144 return (error); 145 } 146 VOP_UNLOCK(devvp, 0, p); 147 } 148 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 149 } 150 if (args.fspec == 0) { 151 #ifdef __notyet__ /* doesn't work correctly with current mountd XXX */ 152 if (args.flags & MSDOSFSMNT_MNTOPT) { 153 pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT; 154 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT; 155 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 156 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 157 } 158 #endif 159 /* 160 * Process export requests. 161 */ 162 return (vfs_export(mp, &pmp->pm_export, 163 &args.export_info)); 164 } 165 } 166 /* 167 * Not an update, or updating the name: look up the name 168 * and verify that it refers to a sensible block device. 169 */ 170 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p); 171 if ((error = namei(ndp)) != 0) 172 return (error); 173 devvp = ndp->ni_vp; 174 175 if (devvp->v_type != VBLK) { 176 vrele(devvp); 177 return (ENOTBLK); 178 } 179 if (major(devvp->v_rdev) >= nblkdev) { 180 vrele(devvp); 181 return (ENXIO); 182 } 183 /* 184 * If mount by non-root, then verify that user has necessary 185 * permissions on the device. 186 */ 187 if (p->p_ucred->cr_uid != 0) { 188 accessmode = VREAD; 189 if ((mp->mnt_flag & MNT_RDONLY) == 0) 190 accessmode |= VWRITE; 191 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p); 192 error = VOP_ACCESS(devvp, accessmode, p->p_ucred, p); 193 if (error) { 194 vput(devvp); 195 return (error); 196 } 197 VOP_UNLOCK(devvp, 0, p); 198 } 199 if ((mp->mnt_flag & MNT_UPDATE) == 0) 200 error = msdosfs_mountfs(devvp, mp, p, &args); 201 else { 202 if (devvp != pmp->pm_devvp) 203 error = EINVAL; /* XXX needs translation */ 204 else 205 vrele(devvp); 206 } 207 if (error) { 208 vrele(devvp); 209 return (error); 210 } 211 pmp = VFSTOMSDOSFS(mp); 212 pmp->pm_gid = args.gid; 213 pmp->pm_uid = args.uid; 214 pmp->pm_mask = args.mask; 215 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT; 216 217 /* 218 * GEMDOS knows nothing (yet) about win95 219 */ 220 if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS) 221 pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 222 223 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 224 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 225 else if (!(pmp->pm_flags & (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 226 struct vnode *rvp; 227 228 /* 229 * Try to divine whether to support Win'95 long filenames 230 */ 231 if (FAT32(pmp)) 232 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 233 else { 234 if ((error = msdosfs_root(mp, &rvp)) != 0) { 235 msdosfs_unmount(mp, MNT_FORCE, p); 236 return (error); 237 } 238 pmp->pm_flags |= findwin95(VTODE(rvp)) 239 ? MSDOSFSMNT_LONGNAME 240 : MSDOSFSMNT_SHORTNAME; 241 vput(rvp); 242 } 243 } 244 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 245 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 246 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 247 &size); 248 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 249 bcopy(&args, &mp->mnt_stat.mount_info.msdosfs_args, sizeof(args)); 250 #ifdef MSDOSFS_DEBUG 251 printf("msdosfs_mount(): mp %x, pmp %x, inusemap %x\n", mp, pmp, pmp->pm_inusemap); 252 #endif 253 return (0); 254 } 255 256 int 257 msdosfs_mountfs(devvp, mp, p, argp) 258 struct vnode *devvp; 259 struct mount *mp; 260 struct proc *p; 261 struct msdosfs_args *argp; 262 { 263 struct msdosfsmount *pmp; 264 struct buf *bp; 265 dev_t dev = devvp->v_rdev; 266 struct partinfo dpart; 267 union bootsector *bsp; 268 struct byte_bpb33 *b33; 269 struct byte_bpb50 *b50; 270 struct byte_bpb710 *b710; 271 extern struct vnode *rootvp; 272 u_int8_t SecPerClust; 273 int ronly, error; 274 int bsize = 0, dtype = 0, tmp; 275 u_long dirsperblk; 276 277 /* 278 * Disallow multiple mounts of the same device. 279 * Disallow mounting of a device that is currently in use 280 * (except for root, which might share swap device for miniroot). 281 * Flush out any old buffers remaining from a previous use. 282 */ 283 if ((error = vfs_mountedon(devvp)) != 0) 284 return (error); 285 if (vcount(devvp) > 1 && devvp != rootvp) 286 return (EBUSY); 287 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p); 288 error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0); 289 VOP_UNLOCK(devvp, 0, p); 290 if (error) 291 return (error); 292 293 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 294 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p); 295 if (error) 296 return (error); 297 298 bp = NULL; /* both used in error_exit */ 299 pmp = NULL; 300 301 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 302 /* 303 * We need the disklabel to calculate the size of a FAT entry 304 * later on. Also make sure the partition contains a filesystem 305 * of type FS_MSDOS. This doesn't work for floppies, so we have 306 * to check for them too. 307 * 308 * At least some parts of the msdos fs driver seem to assume 309 * that the size of a disk block will always be 512 bytes. 310 * Let's check it... 311 */ 312 error = VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, 313 FREAD, NOCRED, p); 314 if (error) 315 goto error_exit; 316 tmp = dpart.part->p_fstype; 317 dtype = dpart.disklab->d_type; 318 bsize = dpart.disklab->d_secsize; 319 if (bsize != 512 || (dtype!=DTYPE_FLOPPY && tmp!=FS_MSDOS)) { 320 error = EFTYPE; 321 goto error_exit; 322 } 323 } 324 325 /* 326 * Read the boot sector of the filesystem, and then check the 327 * boot signature. If not a dos boot sector then error out. 328 */ 329 if ((error = bread(devvp, 0, 512, NOCRED, &bp)) != 0) 330 goto error_exit; 331 bp->b_flags |= B_AGE; 332 bsp = (union bootsector *)bp->b_data; 333 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 334 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 335 b710 = (struct byte_bpb710 *)bsp->bs710.bsPBP; 336 337 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK); 338 bzero((caddr_t)pmp, sizeof *pmp); 339 pmp->pm_mountp = mp; 340 341 /* 342 * Compute several useful quantities from the bpb in the 343 * bootsector. Copy in the dos 5 variant of the bpb then fix up 344 * the fields that are different between dos 5 and dos 3.3. 345 */ 346 SecPerClust = b50->bpbSecPerClust; 347 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 348 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 349 pmp->pm_FATs = b50->bpbFATs; 350 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 351 pmp->pm_Sectors = getushort(b50->bpbSectors); 352 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 353 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 354 pmp->pm_Heads = getushort(b50->bpbHeads); 355 pmp->pm_Media = b50->bpbMedia; 356 357 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 358 /* XXX - We should probably check more values here */ 359 if (!pmp->pm_BytesPerSec || !SecPerClust 360 || pmp->pm_Heads > 255 || pmp->pm_SecPerTrack > 63) { 361 error = EFTYPE; 362 goto error_exit; 363 } 364 } 365 366 if (pmp->pm_Sectors == 0) { 367 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 368 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 369 } else { 370 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 371 pmp->pm_HugeSectors = pmp->pm_Sectors; 372 } 373 374 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 375 if (pmp->pm_HugeSectors > 0xffffffff / dirsperblk + 1) { 376 /* 377 * We cannot deal currently with this size of disk 378 * due to fileid limitations (see msdosfs_getattr and 379 * msdosfs_readdir) 380 */ 381 error = EINVAL; 382 goto error_exit; 383 } 384 385 if (pmp->pm_RootDirEnts == 0) { 386 if (pmp->pm_Sectors || pmp->pm_FATsecs || 387 getushort(b710->bpbFSVers)) { 388 error = EINVAL; 389 goto error_exit; 390 } 391 pmp->pm_fatmask = FAT32_MASK; 392 pmp->pm_fatmult = 4; 393 pmp->pm_fatdiv = 1; 394 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 395 if (getushort(b710->bpbExtFlags) & FATMIRROR) 396 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 397 else 398 pmp->pm_flags |= MSDOSFS_FATMIRROR; 399 } else 400 pmp->pm_flags |= MSDOSFS_FATMIRROR; 401 402 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 403 if (FAT32(pmp)) { 404 /* 405 * GEMDOS doesn't know fat32. 406 */ 407 error = EINVAL; 408 goto error_exit; 409 } 410 411 /* 412 * Check a few values (could do some more): 413 * - logical sector size: power of 2, >= block size 414 * - sectors per cluster: power of 2, >= 1 415 * - number of sectors: >= 1, <= size of partition 416 */ 417 if ( (SecPerClust == 0) 418 || (SecPerClust & (SecPerClust - 1)) 419 || (pmp->pm_BytesPerSec < bsize) 420 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 421 || (pmp->pm_HugeSectors == 0) 422 || (pmp->pm_HugeSectors * (pmp->pm_BytesPerSec / bsize) 423 > dpart.part->p_size) 424 ) { 425 error = EFTYPE; 426 goto error_exit; 427 } 428 /* 429 * XXX - Many parts of the msdos fs driver seem to assume that 430 * the number of bytes per logical sector (BytesPerSec) will 431 * always be the same as the number of bytes per disk block 432 * Let's pretend it is. 433 */ 434 tmp = pmp->pm_BytesPerSec / bsize; 435 pmp->pm_BytesPerSec = bsize; 436 pmp->pm_HugeSectors *= tmp; 437 pmp->pm_HiddenSects *= tmp; 438 pmp->pm_ResSectors *= tmp; 439 pmp->pm_Sectors *= tmp; 440 pmp->pm_FATsecs *= tmp; 441 SecPerClust *= tmp; 442 } 443 pmp->pm_fatblk = pmp->pm_ResSectors; 444 if (FAT32(pmp)) { 445 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 446 pmp->pm_firstcluster = pmp->pm_fatblk 447 + (pmp->pm_FATs * pmp->pm_FATsecs); 448 pmp->pm_fsinfo = getushort(b710->bpbFSInfo); 449 } else { 450 pmp->pm_rootdirblk = pmp->pm_fatblk + 451 (pmp->pm_FATs * pmp->pm_FATsecs); 452 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 453 + pmp->pm_BytesPerSec - 1) 454 / pmp->pm_BytesPerSec;/* in sectors */ 455 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 456 } 457 458 pmp->pm_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 459 SecPerClust; 460 pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 1; 461 pmp->pm_fatsize = pmp->pm_FATsecs * pmp->pm_BytesPerSec; 462 463 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 464 if ((pmp->pm_nmbrofclusters <= (0xff0 - 2)) 465 && ((dtype == DTYPE_FLOPPY) || ((dtype == DTYPE_VNODE) 466 && ((pmp->pm_Heads == 1) || (pmp->pm_Heads == 2)))) 467 ) { 468 pmp->pm_fatmask = FAT12_MASK; 469 pmp->pm_fatmult = 3; 470 pmp->pm_fatdiv = 2; 471 } else { 472 pmp->pm_fatmask = FAT16_MASK; 473 pmp->pm_fatmult = 2; 474 pmp->pm_fatdiv = 1; 475 } 476 } else if (pmp->pm_fatmask == 0) { 477 if (pmp->pm_maxcluster 478 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 479 /* 480 * This will usually be a floppy disk. This size makes 481 * sure that one fat entry will not be split across 482 * multiple blocks. 483 */ 484 pmp->pm_fatmask = FAT12_MASK; 485 pmp->pm_fatmult = 3; 486 pmp->pm_fatdiv = 2; 487 } else { 488 pmp->pm_fatmask = FAT16_MASK; 489 pmp->pm_fatmult = 2; 490 pmp->pm_fatdiv = 1; 491 } 492 } 493 if (FAT12(pmp)) 494 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 495 else 496 pmp->pm_fatblocksize = MAXBSIZE; 497 498 pmp->pm_fatblocksec = pmp->pm_fatblocksize / pmp->pm_BytesPerSec; 499 pmp->pm_bnshift = ffs(pmp->pm_BytesPerSec) - 1; 500 501 /* 502 * Compute mask and shift value for isolating cluster relative byte 503 * offsets and cluster numbers from a file offset. 504 */ 505 pmp->pm_bpcluster = SecPerClust * pmp->pm_BytesPerSec; 506 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 507 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 508 509 /* 510 * Check for valid cluster size 511 * must be a power of 2 512 */ 513 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 514 error = EFTYPE; 515 goto error_exit; 516 } 517 518 /* 519 * Release the bootsector buffer. 520 */ 521 brelse(bp); 522 bp = NULL; 523 524 /* 525 * Check FSInfo 526 */ 527 if (pmp->pm_fsinfo) { 528 struct fsinfo *fp; 529 530 if ((error = bread(devvp, pmp->pm_fsinfo, 1024, NOCRED, &bp)) != 0) 531 goto error_exit; 532 fp = (struct fsinfo *)bp->b_data; 533 if (!bcmp(fp->fsisig1, "RRaA", 4) 534 && !bcmp(fp->fsisig2, "rrAa", 4) 535 && !bcmp(fp->fsisig3, "\0\0\125\252", 4) 536 && !bcmp(fp->fsisig4, "\0\0\125\252", 4)) 537 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 538 else 539 pmp->pm_fsinfo = 0; 540 brelse(bp); 541 bp = NULL; 542 } 543 544 /* 545 * Check and validate (or perhaps invalidate?) the fsinfo structure? XXX 546 */ 547 548 /* 549 * Allocate memory for the bitmap of allocated clusters, and then 550 * fill it in. 551 */ 552 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 553 / N_INUSEBITS) 554 * sizeof(*pmp->pm_inusemap), 555 M_MSDOSFSFAT, M_WAITOK); 556 557 /* 558 * fillinusemap() needs pm_devvp. 559 */ 560 pmp->pm_dev = dev; 561 pmp->pm_devvp = devvp; 562 563 /* 564 * Have the inuse map filled in. 565 */ 566 if ((error = fillinusemap(pmp)) != 0) 567 goto error_exit; 568 569 /* 570 * If they want fat updates to be synchronous then let them suffer 571 * the performance degradation in exchange for the on disk copy of 572 * the fat being correct just about all the time. I suppose this 573 * would be a good thing to turn on if the kernel is still flakey. 574 */ 575 if (mp->mnt_flag & MNT_SYNCHRONOUS) 576 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 577 578 /* 579 * Finish up. 580 */ 581 if (ronly) 582 pmp->pm_flags |= MSDOSFSMNT_RONLY; 583 else 584 pmp->pm_fmod = 1; 585 mp->mnt_data = (qaddr_t)pmp; 586 mp->mnt_stat.f_fsid.val[0] = (long)dev; 587 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 588 #ifdef QUOTA 589 /* 590 * If we ever do quotas for DOS filesystems this would be a place 591 * to fill in the info in the msdosfsmount structure. You dolt, 592 * quotas on dos filesystems make no sense because files have no 593 * owners on dos filesystems. of course there is some empty space 594 * in the directory entry where we could put uid's and gid's. 595 */ 596 #endif 597 devvp->v_specmountpoint = mp; 598 599 return (0); 600 601 error_exit: 602 devvp->v_specmountpoint = NULL; 603 if (bp) 604 brelse(bp); 605 (void) VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p); 606 if (pmp) { 607 if (pmp->pm_inusemap) 608 free(pmp->pm_inusemap, M_MSDOSFSFAT); 609 free(pmp, M_MSDOSFSMNT); 610 mp->mnt_data = (qaddr_t)0; 611 } 612 return (error); 613 } 614 615 int 616 msdosfs_start(mp, flags, p) 617 struct mount *mp; 618 int flags; 619 struct proc *p; 620 { 621 622 return (0); 623 } 624 625 /* 626 * Unmount the filesystem described by mp. 627 */ 628 int 629 msdosfs_unmount(mp, mntflags, p) 630 struct mount *mp; 631 int mntflags; 632 struct proc *p; 633 { 634 struct msdosfsmount *pmp; 635 int error, flags; 636 struct vnode *vp; 637 638 flags = 0; 639 if (mntflags & MNT_FORCE) 640 flags |= FORCECLOSE; 641 #ifdef QUOTA 642 #endif 643 if ((error = vflush(mp, NULLVP, flags)) != 0) 644 return (error); 645 pmp = VFSTOMSDOSFS(mp); 646 pmp->pm_devvp->v_specmountpoint = NULL; 647 vp = pmp->pm_devvp; 648 #ifdef MSDOSFS_DEBUG 649 vprint("msdosfs_umount(): just before calling VOP_CLOSE()\n", vp); 650 #endif 651 error = VOP_CLOSE(vp, 652 pmp->pm_flags & MSDOSFSMNT_RONLY ? FREAD : FREAD|FWRITE, NOCRED, p); 653 vrele(vp); 654 free(pmp->pm_inusemap, M_MSDOSFSFAT); 655 free(pmp, M_MSDOSFSMNT); 656 mp->mnt_data = (qaddr_t)0; 657 mp->mnt_flag &= ~MNT_LOCAL; 658 return (error); 659 } 660 661 int 662 msdosfs_root(mp, vpp) 663 struct mount *mp; 664 struct vnode **vpp; 665 { 666 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 667 struct denode *ndep; 668 int error; 669 670 if ((error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep)) != 0) 671 return (error); 672 673 #ifdef MSDOSFS_DEBUG 674 printf("msdosfs_root(); mp %08x, pmp %08x, ndep %08x, vp %08x\n", 675 mp, pmp, ndep, DETOV(ndep)); 676 #endif 677 678 *vpp = DETOV(ndep); 679 return (0); 680 } 681 682 int 683 msdosfs_statfs(mp, sbp, p) 684 struct mount *mp; 685 struct statfs *sbp; 686 struct proc *p; 687 { 688 struct msdosfsmount *pmp; 689 690 pmp = VFSTOMSDOSFS(mp); 691 sbp->f_bsize = pmp->pm_bpcluster; 692 sbp->f_iosize = pmp->pm_bpcluster; 693 sbp->f_blocks = pmp->pm_nmbrofclusters; 694 sbp->f_bfree = pmp->pm_freeclustercount; 695 sbp->f_bavail = pmp->pm_freeclustercount; 696 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 697 sbp->f_ffree = 0; /* what to put in here? */ 698 if (sbp != &mp->mnt_stat) { 699 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 700 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 701 bcopy(&mp->mnt_stat.mount_info.msdosfs_args, 702 &sbp->mount_info.msdosfs_args, sizeof(struct msdosfs_args)); 703 } 704 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN); 705 return (0); 706 } 707 708 709 struct msdosfs_sync_arg { 710 struct proc *p; 711 struct ucred *cred; 712 int allerror; 713 int waitfor; 714 }; 715 716 int 717 msdosfs_sync_vnode(struct vnode *vp, void *arg) 718 { 719 struct msdosfs_sync_arg *msa = arg; 720 int error; 721 struct denode *dep; 722 723 dep = VTODE(vp); 724 if (vp->v_type == VNON || 725 ((dep->de_flag & (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 726 && vp->v_dirtyblkhd.lh_first == NULL) || 727 msa->waitfor == MNT_LAZY) { 728 simple_unlock(&vp->v_interlock); 729 return (0); 730 } 731 732 if (vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, msa->p)) 733 return (0); 734 735 if ((error = VOP_FSYNC(vp, msa->cred, msa->waitfor, msa->p)) != 0) 736 msa->allerror = error; 737 VOP_UNLOCK(vp, 0, msa->p); 738 vrele(vp); 739 740 return (0); 741 } 742 743 744 int 745 msdosfs_sync(mp, waitfor, cred, p) 746 struct mount *mp; 747 int waitfor; 748 struct ucred *cred; 749 struct proc *p; 750 { 751 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 752 struct msdosfs_sync_arg msa; 753 int error; 754 755 msa.allerror = 0; 756 msa.p = p; 757 msa.cred = cred; 758 msa.waitfor = waitfor; 759 760 /* 761 * If we ever switch to not updating all of the fats all the time, 762 * this would be the place to update them from the first one. 763 */ 764 if (pmp->pm_fmod != 0) { 765 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 766 panic("msdosfs_sync: rofs mod"); 767 else { 768 /* update fats here */ 769 } 770 } 771 /* 772 * Write back each (modified) denode. 773 */ 774 vfs_mount_foreach_vnode(mp, msdosfs_sync_vnode, &msa); 775 776 /* 777 * Force stale file system control information to be flushed. 778 */ 779 if (waitfor != MNT_LAZY) { 780 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY, p); 781 if ((error = VOP_FSYNC(pmp->pm_devvp, cred, waitfor, p)) != 0) 782 msa.allerror = error; 783 VOP_UNLOCK(pmp->pm_devvp, 0, p); 784 } 785 786 return (msa.allerror); 787 } 788 789 int 790 msdosfs_fhtovp(mp, fhp, vpp) 791 struct mount *mp; 792 struct fid *fhp; 793 struct vnode **vpp; 794 { 795 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 796 struct defid *defhp = (struct defid *) fhp; 797 struct denode *dep; 798 int error; 799 800 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 801 if (error) { 802 *vpp = NULLVP; 803 return (error); 804 } 805 *vpp = DETOV(dep); 806 return (0); 807 } 808 809 int 810 msdosfs_vptofh(vp, fhp) 811 struct vnode *vp; 812 struct fid *fhp; 813 { 814 struct denode *dep; 815 struct defid *defhp; 816 817 dep = VTODE(vp); 818 defhp = (struct defid *)fhp; 819 defhp->defid_len = sizeof(struct defid); 820 defhp->defid_dirclust = dep->de_dirclust; 821 defhp->defid_dirofs = dep->de_diroffset; 822 /* defhp->defid_gen = dep->de_gen; */ 823 return (0); 824 } 825 826 int 827 msdosfs_check_export(mp, nam, exflagsp, credanonp) 828 register struct mount *mp; 829 struct mbuf *nam; 830 int *exflagsp; 831 struct ucred **credanonp; 832 { 833 register struct netcred *np; 834 register struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 835 836 /* 837 * Get the export permission structure for this <mp, client> tuple. 838 */ 839 np = vfs_export_lookup(mp, &pmp->pm_export, nam); 840 if (np == NULL) 841 return (EACCES); 842 843 *exflagsp = np->netc_exflags; 844 *credanonp = &np->netc_anon; 845 return (0); 846 } 847 848 #define msdosfs_vget ((int (*)(struct mount *, ino_t, struct vnode **)) \ 849 eopnotsupp) 850 851 #define msdosfs_quotactl ((int (*)(struct mount *, int, uid_t, caddr_t, \ 852 struct proc *))eopnotsupp) 853 854 #define msdosfs_sysctl ((int (*)(int *, u_int, void *, size_t *, void *, \ 855 size_t, struct proc *))eopnotsupp) 856 857 struct vfsops msdosfs_vfsops = { 858 msdosfs_mount, 859 msdosfs_start, 860 msdosfs_unmount, 861 msdosfs_root, 862 msdosfs_quotactl, 863 msdosfs_statfs, 864 msdosfs_sync, 865 msdosfs_vget, 866 msdosfs_fhtovp, 867 msdosfs_vptofh, 868 msdosfs_init, 869 msdosfs_sysctl, 870 msdosfs_check_export 871 }; 872