1 /* $OpenBSD: msdosfs_vfsops.c,v 1.20 2000/03/15 03:18:02 aaron 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 __P((struct mount *, const char *, caddr_t, struct nameidata *, 74 struct proc *)); 75 int msdosfs_start __P((struct mount *, int, struct proc *)); 76 int msdosfs_unmount __P((struct mount *, int, struct proc *)); 77 int msdosfs_root __P((struct mount *, struct vnode **)); 78 int msdosfs_statfs __P((struct mount *, struct statfs *, struct proc *)); 79 int msdosfs_sync __P((struct mount *, int, struct ucred *, struct proc *)); 80 int msdosfs_fhtovp __P((struct mount *, struct fid *, struct vnode **)); 81 int msdosfs_vptofh __P((struct vnode *, struct fid *)); 82 int msdosfs_check_export __P((struct mount *mp, struct mbuf *nam, 83 int *extflagsp, struct ucred **credanonp)); 84 85 int msdosfs_mountfs __P((struct vnode *, struct mount *, struct proc *, 86 struct msdosfs_args *)); 87 88 /* 89 * mp - path - addr in user space of mount point (ie /usr or whatever) 90 * data - addr in user space of mount params including the name of the block 91 * special file to treat as a filesystem. 92 */ 93 int 94 msdosfs_mount(mp, path, data, ndp, p) 95 struct mount *mp; 96 const char *path; 97 caddr_t data; 98 struct nameidata *ndp; 99 struct proc *p; 100 { 101 struct vnode *devvp; /* vnode for blk device to mount */ 102 struct msdosfs_args args; /* will hold data from mount request */ 103 /* msdosfs specific mount control block */ 104 struct msdosfsmount *pmp = NULL; 105 size_t size; 106 int error, flags; 107 mode_t accessmode; 108 109 error = copyin(data, (caddr_t)&args, sizeof(struct msdosfs_args)); 110 if (error) 111 return (error); 112 /* 113 * If updating, check whether changing from read-only to 114 * read/write; if there is no device name, that's all we do. 115 */ 116 if (mp->mnt_flag & MNT_UPDATE) { 117 pmp = VFSTOMSDOSFS(mp); 118 error = 0; 119 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) { 120 flags = WRITECLOSE; 121 if (mp->mnt_flag & MNT_FORCE) 122 flags |= FORCECLOSE; 123 error = vflush(mp, NULLVP, flags); 124 } 125 if (!error && (mp->mnt_flag & MNT_RELOAD)) 126 /* not yet implemented */ 127 error = EOPNOTSUPP; 128 if (error) 129 return (error); 130 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_WANTRDWR)) { 131 /* 132 * If upgrade to read-write by non-root, then verify 133 * that user has necessary permissions on the device. 134 */ 135 if (p->p_ucred->cr_uid != 0) { 136 devvp = pmp->pm_devvp; 137 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p); 138 error = VOP_ACCESS(devvp, VREAD | VWRITE, 139 p->p_ucred, p); 140 if (error) { 141 VOP_UNLOCK(devvp, 0, p); 142 return (error); 143 } 144 VOP_UNLOCK(devvp, 0, p); 145 } 146 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 147 } 148 if (args.fspec == 0) { 149 #ifdef __notyet__ /* doesn't work correctly with current mountd XXX */ 150 if (args.flags & MSDOSFSMNT_MNTOPT) { 151 pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT; 152 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT; 153 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 154 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 155 } 156 #endif 157 /* 158 * Process export requests. 159 */ 160 return (vfs_export(mp, &pmp->pm_export, &args.export)); 161 } 162 } 163 /* 164 * Not an update, or updating the name: look up the name 165 * and verify that it refers to a sensible block device. 166 */ 167 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p); 168 if ((error = namei(ndp)) != 0) 169 return (error); 170 devvp = ndp->ni_vp; 171 172 if (devvp->v_type != VBLK) { 173 vrele(devvp); 174 return (ENOTBLK); 175 } 176 if (major(devvp->v_rdev) >= nblkdev) { 177 vrele(devvp); 178 return (ENXIO); 179 } 180 /* 181 * If mount by non-root, then verify that user has necessary 182 * permissions on the device. 183 */ 184 if (p->p_ucred->cr_uid != 0) { 185 accessmode = VREAD; 186 if ((mp->mnt_flag & MNT_RDONLY) == 0) 187 accessmode |= VWRITE; 188 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p); 189 error = VOP_ACCESS(devvp, accessmode, p->p_ucred, p); 190 if (error) { 191 vput(devvp); 192 return (error); 193 } 194 VOP_UNLOCK(devvp, 0, p); 195 } 196 if ((mp->mnt_flag & MNT_UPDATE) == 0) 197 error = msdosfs_mountfs(devvp, mp, p, &args); 198 else { 199 if (devvp != pmp->pm_devvp) 200 error = EINVAL; /* XXX needs translation */ 201 else 202 vrele(devvp); 203 } 204 if (error) { 205 vrele(devvp); 206 return (error); 207 } 208 pmp = VFSTOMSDOSFS(mp); 209 pmp->pm_gid = args.gid; 210 pmp->pm_uid = args.uid; 211 pmp->pm_mask = args.mask; 212 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT; 213 214 /* 215 * GEMDOS knows nothing (yet) about win95 216 */ 217 if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS) 218 pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 219 220 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 221 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 222 else if (!(pmp->pm_flags & (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 223 struct vnode *rootvp; 224 225 /* 226 * Try to divine whether to support Win'95 long filenames 227 */ 228 if (FAT32(pmp)) 229 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 230 else { 231 if ((error = msdosfs_root(mp, &rootvp)) != 0) { 232 msdosfs_unmount(mp, MNT_FORCE, p); 233 return (error); 234 } 235 pmp->pm_flags |= findwin95(VTODE(rootvp)) 236 ? MSDOSFSMNT_LONGNAME 237 : MSDOSFSMNT_SHORTNAME; 238 vput(rootvp); 239 } 240 } 241 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 242 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 243 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 244 &size); 245 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 246 bcopy(&args, &mp->mnt_stat.mount_info.msdosfs_args, sizeof(args)); 247 #ifdef MSDOSFS_DEBUG 248 printf("msdosfs_mount(): mp %x, pmp %x, inusemap %x\n", mp, pmp, pmp->pm_inusemap); 249 #endif 250 return (0); 251 } 252 253 int 254 msdosfs_mountfs(devvp, mp, p, argp) 255 struct vnode *devvp; 256 struct mount *mp; 257 struct proc *p; 258 struct msdosfs_args *argp; 259 { 260 struct msdosfsmount *pmp; 261 struct buf *bp; 262 dev_t dev = devvp->v_rdev; 263 struct partinfo dpart; 264 union bootsector *bsp; 265 struct byte_bpb33 *b33; 266 struct byte_bpb50 *b50; 267 struct byte_bpb710 *b710; 268 extern struct vnode *rootvp; 269 u_int8_t SecPerClust; 270 int ronly, error; 271 int bsize = 0, dtype = 0, tmp; 272 u_long dirsperblk; 273 274 /* 275 * Disallow multiple mounts of the same device. 276 * Disallow mounting of a device that is currently in use 277 * (except for root, which might share swap device for miniroot). 278 * Flush out any old buffers remaining from a previous use. 279 */ 280 if ((error = vfs_mountedon(devvp)) != 0) 281 return (error); 282 if (vcount(devvp) > 1 && devvp != rootvp) 283 return (EBUSY); 284 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p); 285 error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0); 286 VOP_UNLOCK(devvp, 0, p); 287 if (error) 288 return (error); 289 290 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 291 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p); 292 if (error) 293 return (error); 294 295 bp = NULL; /* both used in error_exit */ 296 pmp = NULL; 297 298 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 299 /* 300 * We need the disklabel to calculate the size of a FAT entry 301 * later on. Also make sure the partition contains a filesystem 302 * of type FS_MSDOS. This doesn't work for floppies, so we have 303 * to check for them too. 304 * 305 * At least some parts of the msdos fs driver seem to assume 306 * that the size of a disk block will always be 512 bytes. 307 * Let's check it... 308 */ 309 error = VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, 310 FREAD, NOCRED, p); 311 if (error) 312 goto error_exit; 313 tmp = dpart.part->p_fstype; 314 dtype = dpart.disklab->d_type; 315 bsize = dpart.disklab->d_secsize; 316 if (bsize != 512 || (dtype!=DTYPE_FLOPPY && tmp!=FS_MSDOS)) { 317 error = EFTYPE; 318 goto error_exit; 319 } 320 } 321 322 /* 323 * Read the boot sector of the filesystem, and then check the 324 * boot signature. If not a dos boot sector then error out. 325 */ 326 if ((error = bread(devvp, 0, 512, NOCRED, &bp)) != 0) 327 goto error_exit; 328 bp->b_flags |= B_AGE; 329 bsp = (union bootsector *)bp->b_data; 330 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 331 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 332 b710 = (struct byte_bpb710 *)bsp->bs710.bsPBP; 333 334 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK); 335 bzero((caddr_t)pmp, sizeof *pmp); 336 pmp->pm_mountp = mp; 337 338 /* 339 * Compute several useful quantities from the bpb in the 340 * bootsector. Copy in the dos 5 variant of the bpb then fix up 341 * the fields that are different between dos 5 and dos 3.3. 342 */ 343 SecPerClust = b50->bpbSecPerClust; 344 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 345 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 346 pmp->pm_FATs = b50->bpbFATs; 347 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 348 pmp->pm_Sectors = getushort(b50->bpbSectors); 349 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 350 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 351 pmp->pm_Heads = getushort(b50->bpbHeads); 352 pmp->pm_Media = b50->bpbMedia; 353 354 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 355 /* XXX - We should probably check more values here */ 356 if (!pmp->pm_BytesPerSec || !SecPerClust 357 || pmp->pm_Heads > 255 || pmp->pm_SecPerTrack > 63) { 358 error = EFTYPE; 359 goto error_exit; 360 } 361 } 362 363 if (pmp->pm_Sectors == 0) { 364 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 365 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 366 } else { 367 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 368 pmp->pm_HugeSectors = pmp->pm_Sectors; 369 } 370 371 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 372 if (pmp->pm_HugeSectors > 0xffffffff / dirsperblk + 1) { 373 /* 374 * We cannot deal currently with this size of disk 375 * due to fileid limitations (see msdosfs_getattr and 376 * msdosfs_readdir) 377 */ 378 error = EINVAL; 379 goto error_exit; 380 } 381 382 if (pmp->pm_RootDirEnts == 0) { 383 if (pmp->pm_Sectors || pmp->pm_FATsecs || 384 getushort(b710->bpbFSVers)) { 385 error = EINVAL; 386 goto error_exit; 387 } 388 pmp->pm_fatmask = FAT32_MASK; 389 pmp->pm_fatmult = 4; 390 pmp->pm_fatdiv = 1; 391 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 392 if (getushort(b710->bpbExtFlags) & FATMIRROR) 393 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 394 else 395 pmp->pm_flags |= MSDOSFS_FATMIRROR; 396 } else 397 pmp->pm_flags |= MSDOSFS_FATMIRROR; 398 399 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 400 if (FAT32(pmp)) { 401 /* 402 * GEMDOS doesn't know fat32. 403 */ 404 error = EINVAL; 405 goto error_exit; 406 } 407 408 /* 409 * Check a few values (could do some more): 410 * - logical sector size: power of 2, >= block size 411 * - sectors per cluster: power of 2, >= 1 412 * - number of sectors: >= 1, <= size of partition 413 */ 414 if ( (SecPerClust == 0) 415 || (SecPerClust & (SecPerClust - 1)) 416 || (pmp->pm_BytesPerSec < bsize) 417 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 418 || (pmp->pm_HugeSectors == 0) 419 || (pmp->pm_HugeSectors * (pmp->pm_BytesPerSec / bsize) 420 > dpart.part->p_size) 421 ) { 422 error = EFTYPE; 423 goto error_exit; 424 } 425 /* 426 * XXX - Many parts of the msdos fs driver seem to assume that 427 * the number of bytes per logical sector (BytesPerSec) will 428 * always be the same as the number of bytes per disk block 429 * Let's pretend it is. 430 */ 431 tmp = pmp->pm_BytesPerSec / bsize; 432 pmp->pm_BytesPerSec = bsize; 433 pmp->pm_HugeSectors *= tmp; 434 pmp->pm_HiddenSects *= tmp; 435 pmp->pm_ResSectors *= tmp; 436 pmp->pm_Sectors *= tmp; 437 pmp->pm_FATsecs *= tmp; 438 SecPerClust *= tmp; 439 } 440 pmp->pm_fatblk = pmp->pm_ResSectors; 441 if (FAT32(pmp)) { 442 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 443 pmp->pm_firstcluster = pmp->pm_fatblk 444 + (pmp->pm_FATs * pmp->pm_FATsecs); 445 pmp->pm_fsinfo = getushort(b710->bpbFSInfo); 446 } else { 447 pmp->pm_rootdirblk = pmp->pm_fatblk + 448 (pmp->pm_FATs * pmp->pm_FATsecs); 449 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 450 + pmp->pm_BytesPerSec - 1) 451 / pmp->pm_BytesPerSec;/* in sectors */ 452 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 453 } 454 455 pmp->pm_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 456 SecPerClust; 457 pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 1; 458 pmp->pm_fatsize = pmp->pm_FATsecs * pmp->pm_BytesPerSec; 459 460 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 461 if ((pmp->pm_nmbrofclusters <= (0xff0 - 2)) 462 && ((dtype == DTYPE_FLOPPY) || ((dtype == DTYPE_VNODE) 463 && ((pmp->pm_Heads == 1) || (pmp->pm_Heads == 2)))) 464 ) { 465 pmp->pm_fatmask = FAT12_MASK; 466 pmp->pm_fatmult = 3; 467 pmp->pm_fatdiv = 2; 468 } else { 469 pmp->pm_fatmask = FAT16_MASK; 470 pmp->pm_fatmult = 2; 471 pmp->pm_fatdiv = 1; 472 } 473 } else if (pmp->pm_fatmask == 0) { 474 if (pmp->pm_maxcluster 475 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 476 /* 477 * This will usually be a floppy disk. This size makes 478 * sure that one fat entry will not be split across 479 * multiple blocks. 480 */ 481 pmp->pm_fatmask = FAT12_MASK; 482 pmp->pm_fatmult = 3; 483 pmp->pm_fatdiv = 2; 484 } else { 485 pmp->pm_fatmask = FAT16_MASK; 486 pmp->pm_fatmult = 2; 487 pmp->pm_fatdiv = 1; 488 } 489 } 490 if (FAT12(pmp)) 491 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 492 else 493 pmp->pm_fatblocksize = MAXBSIZE; 494 495 pmp->pm_fatblocksec = pmp->pm_fatblocksize / pmp->pm_BytesPerSec; 496 pmp->pm_bnshift = ffs(pmp->pm_BytesPerSec) - 1; 497 498 /* 499 * Compute mask and shift value for isolating cluster relative byte 500 * offsets and cluster numbers from a file offset. 501 */ 502 pmp->pm_bpcluster = SecPerClust * pmp->pm_BytesPerSec; 503 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 504 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 505 506 /* 507 * Check for valid cluster size 508 * must be a power of 2 509 */ 510 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 511 error = EFTYPE; 512 goto error_exit; 513 } 514 515 /* 516 * Release the bootsector buffer. 517 */ 518 brelse(bp); 519 bp = NULL; 520 521 /* 522 * Check FSInfo 523 */ 524 if (pmp->pm_fsinfo) { 525 struct fsinfo *fp; 526 527 if ((error = bread(devvp, pmp->pm_fsinfo, 1024, NOCRED, &bp)) != 0) 528 goto error_exit; 529 fp = (struct fsinfo *)bp->b_data; 530 if (!bcmp(fp->fsisig1, "RRaA", 4) 531 && !bcmp(fp->fsisig2, "rrAa", 4) 532 && !bcmp(fp->fsisig3, "\0\0\125\252", 4) 533 && !bcmp(fp->fsisig4, "\0\0\125\252", 4)) 534 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 535 else 536 pmp->pm_fsinfo = 0; 537 brelse(bp); 538 bp = NULL; 539 } 540 541 /* 542 * Check and validate (or perhaps invalidate?) the fsinfo structure? XXX 543 */ 544 545 /* 546 * Allocate memory for the bitmap of allocated clusters, and then 547 * fill it in. 548 */ 549 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 550 / N_INUSEBITS) 551 * sizeof(*pmp->pm_inusemap), 552 M_MSDOSFSFAT, M_WAITOK); 553 554 /* 555 * fillinusemap() needs pm_devvp. 556 */ 557 pmp->pm_dev = dev; 558 pmp->pm_devvp = devvp; 559 560 /* 561 * Have the inuse map filled in. 562 */ 563 if ((error = fillinusemap(pmp)) != 0) 564 goto error_exit; 565 566 /* 567 * If they want fat updates to be synchronous then let them suffer 568 * the performance degradation in exchange for the on disk copy of 569 * the fat being correct just about all the time. I suppose this 570 * would be a good thing to turn on if the kernel is still flakey. 571 */ 572 if (mp->mnt_flag & MNT_SYNCHRONOUS) 573 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 574 575 /* 576 * Finish up. 577 */ 578 if (ronly) 579 pmp->pm_flags |= MSDOSFSMNT_RONLY; 580 else 581 pmp->pm_fmod = 1; 582 mp->mnt_data = (qaddr_t)pmp; 583 mp->mnt_stat.f_fsid.val[0] = (long)dev; 584 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 585 #ifdef QUOTA 586 /* 587 * If we ever do quotas for DOS filesystems this would be a place 588 * to fill in the info in the msdosfsmount structure. You dolt, 589 * quotas on dos filesystems make no sense because files have no 590 * owners on dos filesystems. of course there is some empty space 591 * in the directory entry where we could put uid's and gid's. 592 */ 593 #endif 594 devvp->v_specmountpoint = mp; 595 596 return (0); 597 598 error_exit: 599 devvp->v_specmountpoint = NULL; 600 if (bp) 601 brelse(bp); 602 (void) VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p); 603 if (pmp) { 604 if (pmp->pm_inusemap) 605 free(pmp->pm_inusemap, M_MSDOSFSFAT); 606 free(pmp, M_MSDOSFSMNT); 607 mp->mnt_data = (qaddr_t)0; 608 } 609 return (error); 610 } 611 612 int 613 msdosfs_start(mp, flags, p) 614 struct mount *mp; 615 int flags; 616 struct proc *p; 617 { 618 619 return (0); 620 } 621 622 /* 623 * Unmount the filesystem described by mp. 624 */ 625 int 626 msdosfs_unmount(mp, mntflags, p) 627 struct mount *mp; 628 int mntflags; 629 struct proc *p; 630 { 631 struct msdosfsmount *pmp; 632 int error, flags; 633 struct vnode *vp; 634 635 flags = 0; 636 if (mntflags & MNT_FORCE) 637 flags |= FORCECLOSE; 638 #ifdef QUOTA 639 #endif 640 if ((error = vflush(mp, NULLVP, flags)) != 0) 641 return (error); 642 pmp = VFSTOMSDOSFS(mp); 643 pmp->pm_devvp->v_specmountpoint = NULL; 644 vp = pmp->pm_devvp; 645 #ifdef MSDOSFS_DEBUG 646 vprint("msdosfs_umount(): just before calling VOP_CLOSE()\n", vp); 647 #endif 648 error = VOP_CLOSE(vp, 649 pmp->pm_flags & MSDOSFSMNT_RONLY ? FREAD : FREAD|FWRITE, NOCRED, p); 650 vrele(vp); 651 free(pmp->pm_inusemap, M_MSDOSFSFAT); 652 free(pmp, M_MSDOSFSMNT); 653 mp->mnt_data = (qaddr_t)0; 654 mp->mnt_flag &= ~MNT_LOCAL; 655 return (error); 656 } 657 658 int 659 msdosfs_root(mp, vpp) 660 struct mount *mp; 661 struct vnode **vpp; 662 { 663 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 664 struct denode *ndep; 665 int error; 666 667 #ifdef MSDOSFS_DEBUG 668 printf("msdosfs_root(); mp %08x, pmp %08x, ndep %08x, vp %08x\n", 669 mp, pmp, ndep, DETOV(ndep)); 670 #endif 671 if ((error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep)) != 0) 672 return (error); 673 *vpp = DETOV(ndep); 674 return (0); 675 } 676 677 int 678 msdosfs_statfs(mp, sbp, p) 679 struct mount *mp; 680 struct statfs *sbp; 681 struct proc *p; 682 { 683 struct msdosfsmount *pmp; 684 685 pmp = VFSTOMSDOSFS(mp); 686 sbp->f_bsize = pmp->pm_bpcluster; 687 sbp->f_iosize = pmp->pm_bpcluster; 688 sbp->f_blocks = pmp->pm_nmbrofclusters; 689 sbp->f_bfree = pmp->pm_freeclustercount; 690 sbp->f_bavail = pmp->pm_freeclustercount; 691 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 692 sbp->f_ffree = 0; /* what to put in here? */ 693 if (sbp != &mp->mnt_stat) { 694 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 695 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 696 bcopy(&mp->mnt_stat.mount_info.msdosfs_args, 697 &sbp->mount_info.msdosfs_args, sizeof(struct msdosfs_args)); 698 } 699 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN); 700 return (0); 701 } 702 703 int 704 msdosfs_sync(mp, waitfor, cred, p) 705 struct mount *mp; 706 int waitfor; 707 struct ucred *cred; 708 struct proc *p; 709 { 710 struct vnode *vp, *nvp; 711 struct denode *dep; 712 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 713 int error, allerror = 0; 714 715 /* 716 * If we ever switch to not updating all of the fats all the time, 717 * this would be the place to update them from the first one. 718 */ 719 if (pmp->pm_fmod != 0) { 720 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 721 panic("msdosfs_sync: rofs mod"); 722 else { 723 /* update fats here */ 724 } 725 } 726 /* 727 * Write back each (modified) denode. 728 */ 729 simple_lock(&mntvnode_slock); 730 loop: 731 for (vp = mp->mnt_vnodelist.lh_first; 732 vp != NULL; 733 vp = nvp) { 734 /* 735 * If the vnode that we are about to sync is no longer 736 * assoicated with this mount point, start over. 737 */ 738 if (vp->v_mount != mp) 739 goto loop; 740 741 simple_lock(&vp->v_interlock); 742 nvp = vp->v_mntvnodes.le_next; 743 dep = VTODE(vp); 744 if (vp->v_type == VNON || ((dep->de_flag & 745 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 746 && vp->v_dirtyblkhd.lh_first == NULL) || 747 waitfor == MNT_LAZY) { 748 simple_unlock(&vp->v_interlock); 749 continue; 750 } 751 simple_unlock(&mntvnode_slock); 752 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, p); 753 if (error) { 754 simple_lock(&mntvnode_slock); 755 if (error == ENOENT) 756 goto loop; 757 continue; 758 } 759 if ((error = VOP_FSYNC(vp, cred, waitfor, p)) != 0) 760 allerror = error; 761 VOP_UNLOCK(vp, 0, p); 762 vrele(vp); 763 simple_lock(&mntvnode_slock); 764 } 765 simple_unlock(&mntvnode_slock); 766 /* 767 * Force stale file system control information to be flushed. 768 */ 769 if (waitfor != MNT_LAZY) { 770 if (pmp->pm_mountp->mnt_flag & MNT_SOFTDEP) 771 waitfor = MNT_NOWAIT; 772 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY, p); 773 if ((error = VOP_FSYNC(pmp->pm_devvp, cred, waitfor, p)) != 0) 774 allerror = error; 775 VOP_UNLOCK(pmp->pm_devvp, 0, p); 776 } 777 #ifdef QUOTA 778 #endif 779 return (allerror); 780 } 781 782 int 783 msdosfs_fhtovp(mp, fhp, vpp) 784 struct mount *mp; 785 struct fid *fhp; 786 struct vnode **vpp; 787 { 788 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 789 struct defid *defhp = (struct defid *) fhp; 790 struct denode *dep; 791 int error; 792 793 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 794 if (error) { 795 *vpp = NULLVP; 796 return (error); 797 } 798 *vpp = DETOV(dep); 799 return (0); 800 } 801 802 int 803 msdosfs_vptofh(vp, fhp) 804 struct vnode *vp; 805 struct fid *fhp; 806 { 807 struct denode *dep; 808 struct defid *defhp; 809 810 dep = VTODE(vp); 811 defhp = (struct defid *)fhp; 812 defhp->defid_len = sizeof(struct defid); 813 defhp->defid_dirclust = dep->de_dirclust; 814 defhp->defid_dirofs = dep->de_diroffset; 815 /* defhp->defid_gen = dep->de_gen; */ 816 return (0); 817 } 818 819 int 820 msdosfs_check_export(mp, nam, exflagsp, credanonp) 821 register struct mount *mp; 822 struct mbuf *nam; 823 int *exflagsp; 824 struct ucred **credanonp; 825 { 826 register struct netcred *np; 827 register struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 828 829 /* 830 * Get the export permission structure for this <mp, client> tuple. 831 */ 832 np = vfs_export_lookup(mp, &pmp->pm_export, nam); 833 if (np == NULL) 834 return (EACCES); 835 836 *exflagsp = np->netc_exflags; 837 *credanonp = &np->netc_anon; 838 return (0); 839 } 840 841 #define msdosfs_vget ((int (*) __P((struct mount *, ino_t, struct vnode **))) \ 842 eopnotsupp) 843 844 #define msdosfs_quotactl ((int (*) __P((struct mount *, int, uid_t, caddr_t, \ 845 struct proc *)))eopnotsupp) 846 847 #define msdosfs_sysctl ((int (*) __P((int *, u_int, void *, size_t *, void *, \ 848 size_t, struct proc *)))eopnotsupp) 849 850 struct vfsops msdosfs_vfsops = { 851 msdosfs_mount, 852 msdosfs_start, 853 msdosfs_unmount, 854 msdosfs_root, 855 msdosfs_quotactl, 856 msdosfs_statfs, 857 msdosfs_sync, 858 msdosfs_vget, 859 msdosfs_fhtovp, 860 msdosfs_vptofh, 861 msdosfs_init, 862 msdosfs_sysctl, 863 msdosfs_check_export 864 }; 865