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/bio.h> 60 #include <sys/buf.h> 61 #include <sys/fcntl.h> 62 #include <sys/malloc.h> 63 #include <sys/stat.h> /* defines ALLPERMS */ 64 #include <sys/mutex.h> 65 66 #include <fs/msdosfs/bpb.h> 67 #include <fs/msdosfs/bootsect.h> 68 #include <fs/msdosfs/direntry.h> 69 #include <fs/msdosfs/denode.h> 70 #include <fs/msdosfs/msdosfsmount.h> 71 #include <fs/msdosfs/fat.h> 72 73 #define MSDOSFS_DFLTBSIZE 4096 74 75 #if 1 /*def PC98*/ 76 /* 77 * XXX - The boot signature formatted by NEC PC-98 DOS looks like a 78 * garbage or a random value :-{ 79 * If you want to use that broken-signatured media, define the 80 * following symbol even though PC/AT. 81 * (ex. mount PC-98 DOS formatted FD on PC/AT) 82 */ 83 #define MSDOSFS_NOCHECKSIG 84 #endif 85 86 MALLOC_DEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOSFS mount structure"); 87 static MALLOC_DEFINE(M_MSDOSFSFAT, "MSDOSFS FAT", "MSDOSFS file allocation table"); 88 89 static int update_mp __P((struct mount *mp, struct msdosfs_args *argp)); 90 static int mountmsdosfs __P((struct vnode *devvp, struct mount *mp, 91 struct thread *td, struct msdosfs_args *argp)); 92 static int msdosfs_fhtovp __P((struct mount *, struct fid *, 93 struct vnode **)); 94 static int msdosfs_mount __P((struct mount *, char *, caddr_t, 95 struct nameidata *, struct thread *)); 96 static int msdosfs_root __P((struct mount *, struct vnode **)); 97 static int msdosfs_statfs __P((struct mount *, struct statfs *, 98 struct thread *)); 99 static int msdosfs_sync __P((struct mount *, int, struct ucred *, 100 struct thread *)); 101 static int msdosfs_unmount __P((struct mount *, int, struct thread *)); 102 static int msdosfs_vptofh __P((struct vnode *, struct fid *)); 103 104 static int 105 update_mp(mp, argp) 106 struct mount *mp; 107 struct msdosfs_args *argp; 108 { 109 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 110 int error; 111 112 pmp->pm_gid = argp->gid; 113 pmp->pm_uid = argp->uid; 114 pmp->pm_mask = argp->mask & ALLPERMS; 115 pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT; 116 if (pmp->pm_flags & MSDOSFSMNT_U2WTABLE) { 117 bcopy(argp->u2w, pmp->pm_u2w, sizeof(pmp->pm_u2w)); 118 bcopy(argp->d2u, pmp->pm_d2u, sizeof(pmp->pm_d2u)); 119 bcopy(argp->u2d, pmp->pm_u2d, sizeof(pmp->pm_u2d)); 120 } 121 if (pmp->pm_flags & MSDOSFSMNT_ULTABLE) { 122 bcopy(argp->ul, pmp->pm_ul, sizeof(pmp->pm_ul)); 123 bcopy(argp->lu, pmp->pm_lu, sizeof(pmp->pm_lu)); 124 } 125 126 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 127 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 128 else if (!(pmp->pm_flags & 129 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 130 struct vnode *rootvp; 131 132 /* 133 * Try to divine whether to support Win'95 long filenames 134 */ 135 if (FAT32(pmp)) 136 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 137 else { 138 if ((error = msdosfs_root(mp, &rootvp)) != 0) 139 return error; 140 pmp->pm_flags |= findwin95(VTODE(rootvp)) 141 ? MSDOSFSMNT_LONGNAME 142 : MSDOSFSMNT_SHORTNAME; 143 vput(rootvp); 144 } 145 } 146 return 0; 147 } 148 149 /* 150 * mp - path - addr in user space of mount point (ie /usr or whatever) 151 * data - addr in user space of mount params including the name of the block 152 * special file to treat as a filesystem. 153 */ 154 static int 155 msdosfs_mount(mp, path, data, ndp, td) 156 struct mount *mp; 157 char *path; 158 caddr_t data; 159 struct nameidata *ndp; 160 struct thread *td; 161 { 162 struct vnode *devvp; /* vnode for blk device to mount */ 163 struct msdosfs_args args; /* will hold data from mount request */ 164 /* msdosfs specific mount control block */ 165 struct msdosfsmount *pmp = NULL; 166 size_t size; 167 int error, flags; 168 mode_t accessmode; 169 170 error = copyin(data, (caddr_t)&args, sizeof(struct msdosfs_args)); 171 if (error) 172 return (error); 173 if (args.magic != MSDOSFS_ARGSMAGIC) 174 args.flags = 0; 175 /* 176 * If updating, check whether changing from read-only to 177 * read/write; if there is no device name, that's all we do. 178 */ 179 if (mp->mnt_flag & MNT_UPDATE) { 180 pmp = VFSTOMSDOSFS(mp); 181 error = 0; 182 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) { 183 flags = WRITECLOSE; 184 if (mp->mnt_flag & MNT_FORCE) 185 flags |= FORCECLOSE; 186 error = vflush(mp, 0, flags); 187 } 188 if (!error && (mp->mnt_flag & MNT_RELOAD)) 189 /* not yet implemented */ 190 error = EOPNOTSUPP; 191 if (error) 192 return (error); 193 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 194 /* 195 * If upgrade to read-write by non-root, then verify 196 * that user has necessary permissions on the device. 197 */ 198 if (suser_td(td)) { 199 devvp = pmp->pm_devvp; 200 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 201 error = VOP_ACCESS(devvp, VREAD | VWRITE, 202 td->td_proc->p_ucred, td); 203 if (error) { 204 VOP_UNLOCK(devvp, 0, td); 205 return (error); 206 } 207 VOP_UNLOCK(devvp, 0, td); 208 } 209 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 210 } 211 if (args.fspec == 0) { 212 #ifdef __notyet__ /* doesn't work correctly with current mountd XXX */ 213 if (args.flags & MSDOSFSMNT_MNTOPT) { 214 pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT; 215 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT; 216 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 217 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 218 } 219 #endif 220 /* 221 * Process export requests. 222 */ 223 return (vfs_export(mp, &args.export)); 224 } 225 } 226 /* 227 * Not an update, or updating the name: look up the name 228 * and verify that it refers to a sensible block device. 229 */ 230 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, td); 231 error = namei(ndp); 232 if (error) 233 return (error); 234 devvp = ndp->ni_vp; 235 NDFREE(ndp, NDF_ONLY_PNBUF); 236 237 if (!vn_isdisk(devvp, &error)) { 238 vrele(devvp); 239 return (error); 240 } 241 /* 242 * If mount by non-root, then verify that user has necessary 243 * permissions on the device. 244 */ 245 if (suser_td(td)) { 246 accessmode = VREAD; 247 if ((mp->mnt_flag & MNT_RDONLY) == 0) 248 accessmode |= VWRITE; 249 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 250 error = VOP_ACCESS(devvp, accessmode, td->td_proc->p_ucred, td); 251 if (error) { 252 vput(devvp); 253 return (error); 254 } 255 VOP_UNLOCK(devvp, 0, td); 256 } 257 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 258 error = mountmsdosfs(devvp, mp, td, &args); 259 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 260 pmp = VFSTOMSDOSFS(mp); 261 #endif 262 } else { 263 if (devvp != pmp->pm_devvp) 264 error = EINVAL; /* XXX needs translation */ 265 else 266 vrele(devvp); 267 } 268 if (error) { 269 vrele(devvp); 270 return (error); 271 } 272 273 error = update_mp(mp, &args); 274 if (error) { 275 msdosfs_unmount(mp, MNT_FORCE, td); 276 return error; 277 } 278 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 279 &size); 280 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 281 (void) msdosfs_statfs(mp, &mp->mnt_stat, td); 282 #ifdef MSDOSFS_DEBUG 283 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 284 #endif 285 return (0); 286 } 287 288 static int 289 mountmsdosfs(devvp, mp, td, argp) 290 struct vnode *devvp; 291 struct mount *mp; 292 struct thread *td; 293 struct msdosfs_args *argp; 294 { 295 struct msdosfsmount *pmp; 296 struct buf *bp; 297 dev_t dev = devvp->v_rdev; 298 union bootsector *bsp; 299 struct byte_bpb33 *b33; 300 struct byte_bpb50 *b50; 301 struct byte_bpb710 *b710; 302 u_int8_t SecPerClust; 303 u_long clusters; 304 int ronly, error; 305 306 /* 307 * Disallow multiple mounts of the same device. 308 * Disallow mounting of a device that is currently in use 309 * (except for root, which might share swap device for miniroot). 310 * Flush out any old buffers remaining from a previous use. 311 */ 312 error = vfs_mountedon(devvp); 313 if (error) 314 return (error); 315 if (vcount(devvp) > 1 && devvp != rootvp) 316 return (EBUSY); 317 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 318 error = vinvalbuf(devvp, V_SAVE, td->td_proc->p_ucred, td, 0, 0); 319 VOP_UNLOCK(devvp, 0, td); 320 if (error) 321 return (error); 322 323 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 324 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 325 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, td); 326 VOP_UNLOCK(devvp, 0, td); 327 if (error) 328 return (error); 329 330 bp = NULL; /* both used in error_exit */ 331 pmp = NULL; 332 333 /* 334 * Read the boot sector of the filesystem, and then check the 335 * boot signature. If not a dos boot sector then error out. 336 * 337 * NOTE: 2048 is a maximum sector size in current... 338 */ 339 error = bread(devvp, 0, 2048, NOCRED, &bp); 340 if (error) 341 goto error_exit; 342 bp->b_flags |= B_AGE; 343 bsp = (union bootsector *)bp->b_data; 344 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 345 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 346 b710 = (struct byte_bpb710 *)bsp->bs710.bsPBP; 347 348 #ifndef MSDOSFS_NOCHECKSIG 349 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 350 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 351 error = EINVAL; 352 goto error_exit; 353 } 354 #endif 355 356 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK | M_ZERO); 357 pmp->pm_mountp = mp; 358 359 /* 360 * Compute several useful quantities from the bpb in the 361 * bootsector. Copy in the dos 5 variant of the bpb then fix up 362 * the fields that are different between dos 5 and dos 3.3. 363 */ 364 SecPerClust = b50->bpbSecPerClust; 365 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 366 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 367 pmp->pm_FATs = b50->bpbFATs; 368 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 369 pmp->pm_Sectors = getushort(b50->bpbSectors); 370 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 371 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 372 pmp->pm_Heads = getushort(b50->bpbHeads); 373 pmp->pm_Media = b50->bpbMedia; 374 375 /* calculate the ratio of sector size to DEV_BSIZE */ 376 pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE; 377 378 /* XXX - We should probably check more values here */ 379 if (!pmp->pm_BytesPerSec || !SecPerClust 380 || !pmp->pm_Heads || pmp->pm_Heads > 255 381 #ifdef PC98 382 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 255) { 383 #else 384 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 63) { 385 #endif 386 error = EINVAL; 387 goto error_exit; 388 } 389 390 if (pmp->pm_Sectors == 0) { 391 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 392 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 393 } else { 394 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 395 pmp->pm_HugeSectors = pmp->pm_Sectors; 396 } 397 if (pmp->pm_HugeSectors > 0xffffffff / 398 (pmp->pm_BytesPerSec / sizeof(struct direntry)) + 1) { 399 /* 400 * We cannot deal currently with this size of disk 401 * due to fileid limitations (see msdosfs_getattr and 402 * msdosfs_readdir) 403 */ 404 error = EINVAL; 405 printf("mountmsdosfs(): disk too big, sorry\n"); 406 goto error_exit; 407 } 408 409 if (pmp->pm_RootDirEnts == 0) { 410 if (bsp->bs710.bsBootSectSig2 != BOOTSIG2 411 || bsp->bs710.bsBootSectSig3 != BOOTSIG3 412 || pmp->pm_Sectors 413 || pmp->pm_FATsecs 414 || getushort(b710->bpbFSVers)) { 415 error = EINVAL; 416 printf("mountmsdosfs(): bad FAT32 filesystem\n"); 417 goto error_exit; 418 } 419 pmp->pm_fatmask = FAT32_MASK; 420 pmp->pm_fatmult = 4; 421 pmp->pm_fatdiv = 1; 422 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 423 if (getushort(b710->bpbExtFlags) & FATMIRROR) 424 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 425 else 426 pmp->pm_flags |= MSDOSFS_FATMIRROR; 427 } else 428 pmp->pm_flags |= MSDOSFS_FATMIRROR; 429 430 /* 431 * Check a few values (could do some more): 432 * - logical sector size: power of 2, >= block size 433 * - sectors per cluster: power of 2, >= 1 434 * - number of sectors: >= 1, <= size of partition 435 */ 436 if ( (SecPerClust == 0) 437 || (SecPerClust & (SecPerClust - 1)) 438 || (pmp->pm_BytesPerSec < DEV_BSIZE) 439 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 440 || (pmp->pm_HugeSectors == 0) 441 ) { 442 error = EINVAL; 443 goto error_exit; 444 } 445 446 pmp->pm_HugeSectors *= pmp->pm_BlkPerSec; 447 pmp->pm_HiddenSects *= pmp->pm_BlkPerSec; /* XXX not used? */ 448 pmp->pm_FATsecs *= pmp->pm_BlkPerSec; 449 SecPerClust *= pmp->pm_BlkPerSec; 450 451 pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec; 452 453 if (FAT32(pmp)) { 454 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 455 pmp->pm_firstcluster = pmp->pm_fatblk 456 + (pmp->pm_FATs * pmp->pm_FATsecs); 457 pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec; 458 } else { 459 pmp->pm_rootdirblk = pmp->pm_fatblk + 460 (pmp->pm_FATs * pmp->pm_FATsecs); 461 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 462 + DEV_BSIZE - 1) 463 / DEV_BSIZE; /* in blocks */ 464 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 465 } 466 467 pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 468 SecPerClust + 1; 469 pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE; /* XXX not used? */ 470 471 if (pmp->pm_fatmask == 0) { 472 if (pmp->pm_maxcluster 473 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 474 /* 475 * This will usually be a floppy disk. This size makes 476 * sure that one fat entry will not be split across 477 * multiple blocks. 478 */ 479 pmp->pm_fatmask = FAT12_MASK; 480 pmp->pm_fatmult = 3; 481 pmp->pm_fatdiv = 2; 482 } else { 483 pmp->pm_fatmask = FAT16_MASK; 484 pmp->pm_fatmult = 2; 485 pmp->pm_fatdiv = 1; 486 } 487 } 488 489 clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv; 490 if (pmp->pm_maxcluster >= clusters) { 491 printf("Warning: number of clusters (%ld) exceeds FAT " 492 "capacity (%ld)\n", pmp->pm_maxcluster + 1, clusters); 493 pmp->pm_maxcluster = clusters - 1; 494 } 495 496 497 if (FAT12(pmp)) 498 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 499 else 500 pmp->pm_fatblocksize = MSDOSFS_DFLTBSIZE; 501 502 pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE; 503 pmp->pm_bnshift = ffs(DEV_BSIZE) - 1; 504 505 /* 506 * Compute mask and shift value for isolating cluster relative byte 507 * offsets and cluster numbers from a file offset. 508 */ 509 pmp->pm_bpcluster = SecPerClust * DEV_BSIZE; 510 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 511 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 512 513 /* 514 * Check for valid cluster size 515 * must be a power of 2 516 */ 517 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 518 error = EINVAL; 519 goto error_exit; 520 } 521 522 /* 523 * Release the bootsector buffer. 524 */ 525 brelse(bp); 526 bp = NULL; 527 528 /* 529 * Check FSInfo. 530 */ 531 if (pmp->pm_fsinfo) { 532 struct fsinfo *fp; 533 534 if ((error = bread(devvp, pmp->pm_fsinfo, fsi_size(pmp), 535 NOCRED, &bp)) != 0) 536 goto error_exit; 537 fp = (struct fsinfo *)bp->b_data; 538 if (!bcmp(fp->fsisig1, "RRaA", 4) 539 && !bcmp(fp->fsisig2, "rrAa", 4) 540 && !bcmp(fp->fsisig3, "\0\0\125\252", 4) 541 && !bcmp(fp->fsisig4, "\0\0\125\252", 4)) 542 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 543 else 544 pmp->pm_fsinfo = 0; 545 brelse(bp); 546 bp = NULL; 547 } 548 549 /* 550 * Check and validate (or perhaps invalidate?) the fsinfo structure? XXX 551 */ 552 553 /* 554 * Allocate memory for the bitmap of allocated clusters, and then 555 * fill it in. 556 */ 557 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 558 / N_INUSEBITS) 559 * sizeof(*pmp->pm_inusemap), 560 M_MSDOSFSFAT, M_WAITOK); 561 562 /* 563 * fillinusemap() needs pm_devvp. 564 */ 565 pmp->pm_dev = dev; 566 pmp->pm_devvp = devvp; 567 568 /* 569 * Have the inuse map filled in. 570 */ 571 if ((error = fillinusemap(pmp)) != 0) 572 goto error_exit; 573 574 /* 575 * If they want fat updates to be synchronous then let them suffer 576 * the performance degradation in exchange for the on disk copy of 577 * the fat being correct just about all the time. I suppose this 578 * would be a good thing to turn on if the kernel is still flakey. 579 */ 580 if (mp->mnt_flag & MNT_SYNCHRONOUS) 581 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 582 583 /* 584 * Finish up. 585 */ 586 if (ronly) 587 pmp->pm_flags |= MSDOSFSMNT_RONLY; 588 else 589 pmp->pm_fmod = 1; 590 mp->mnt_data = (qaddr_t) pmp; 591 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 592 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 593 mp->mnt_flag |= MNT_LOCAL; 594 devvp->v_rdev->si_mountpoint = mp; 595 596 return 0; 597 598 error_exit: 599 if (bp) 600 brelse(bp); 601 (void) VOP_CLOSE(devvp, ronly ? FREAD : FREAD | FWRITE, NOCRED, td); 602 if (pmp) { 603 if (pmp->pm_inusemap) 604 free(pmp->pm_inusemap, M_MSDOSFSFAT); 605 free(pmp, M_MSDOSFSMNT); 606 mp->mnt_data = (qaddr_t)0; 607 } 608 return (error); 609 } 610 611 /* 612 * Unmount the filesystem described by mp. 613 */ 614 static int 615 msdosfs_unmount(mp, mntflags, td) 616 struct mount *mp; 617 int mntflags; 618 struct thread *td; 619 { 620 struct msdosfsmount *pmp; 621 int error, flags; 622 623 flags = 0; 624 if (mntflags & MNT_FORCE) 625 flags |= FORCECLOSE; 626 error = vflush(mp, 0, flags); 627 if (error) 628 return error; 629 pmp = VFSTOMSDOSFS(mp); 630 pmp->pm_devvp->v_rdev->si_mountpoint = NULL; 631 #ifdef MSDOSFS_DEBUG 632 { 633 struct vnode *vp = pmp->pm_devvp; 634 635 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 636 printf("flag %08lx, usecount %d, writecount %d, holdcnt %ld\n", 637 vp->v_flag, vp->v_usecount, vp->v_writecount, vp->v_holdcnt); 638 printf("id %lu, mount %p, op %p\n", 639 vp->v_id, vp->v_mount, vp->v_op); 640 printf("freef %p, freeb %p, mount %p\n", 641 TAILQ_NEXT(vp, v_freelist), vp->v_freelist.tqe_prev, 642 vp->v_mount); 643 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %ld, type %d\n", 644 TAILQ_FIRST(&vp->v_cleanblkhd), 645 TAILQ_FIRST(&vp->v_dirtyblkhd), 646 vp->v_numoutput, vp->v_type); 647 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 648 vp->v_socket, vp->v_tag, 649 ((u_int *)vp->v_data)[0], 650 ((u_int *)vp->v_data)[1]); 651 } 652 #endif 653 error = VOP_CLOSE(pmp->pm_devvp, 654 (pmp->pm_flags&MSDOSFSMNT_RONLY) ? FREAD : FREAD | FWRITE, 655 NOCRED, td); 656 vrele(pmp->pm_devvp); 657 free(pmp->pm_inusemap, M_MSDOSFSFAT); 658 free(pmp, M_MSDOSFSMNT); 659 mp->mnt_data = (qaddr_t)0; 660 mp->mnt_flag &= ~MNT_LOCAL; 661 return (error); 662 } 663 664 static int 665 msdosfs_root(mp, vpp) 666 struct mount *mp; 667 struct vnode **vpp; 668 { 669 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 670 struct denode *ndep; 671 int error; 672 673 #ifdef MSDOSFS_DEBUG 674 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 675 #endif 676 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep); 677 if (error) 678 return (error); 679 *vpp = DETOV(ndep); 680 return (0); 681 } 682 683 static int 684 msdosfs_statfs(mp, sbp, td) 685 struct mount *mp; 686 struct statfs *sbp; 687 struct thread *td; 688 { 689 struct msdosfsmount *pmp; 690 691 pmp = VFSTOMSDOSFS(mp); 692 sbp->f_bsize = pmp->pm_bpcluster; 693 sbp->f_iosize = pmp->pm_bpcluster; 694 sbp->f_blocks = pmp->pm_maxcluster + 1; 695 sbp->f_bfree = pmp->pm_freeclustercount; 696 sbp->f_bavail = pmp->pm_freeclustercount; 697 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 698 sbp->f_ffree = 0; /* what to put in here? */ 699 if (sbp != &mp->mnt_stat) { 700 sbp->f_type = mp->mnt_vfc->vfc_typenum; 701 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 702 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 703 } 704 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN); 705 return (0); 706 } 707 708 static int 709 msdosfs_sync(mp, waitfor, cred, td) 710 struct mount *mp; 711 int waitfor; 712 struct ucred *cred; 713 struct thread *td; 714 { 715 struct vnode *vp, *nvp; 716 struct denode *dep; 717 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 718 int error, allerror = 0; 719 720 /* 721 * If we ever switch to not updating all of the fats all the time, 722 * this would be the place to update them from the first one. 723 */ 724 if (pmp->pm_fmod != 0) { 725 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 726 panic("msdosfs_sync: rofs mod"); 727 else { 728 /* update fats here */ 729 } 730 } 731 /* 732 * Write back each (modified) denode. 733 */ 734 mtx_lock(&mntvnode_mtx); 735 loop: 736 for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist); vp != NULL; vp = nvp) { 737 /* 738 * If the vnode that we are about to sync is no longer 739 * associated with this mount point, start over. 740 */ 741 if (vp->v_mount != mp) 742 goto loop; 743 nvp = TAILQ_NEXT(vp, v_nmntvnodes); 744 745 mtx_unlock(&mntvnode_mtx); 746 mtx_lock(&vp->v_interlock); 747 dep = VTODE(vp); 748 if (vp->v_type == VNON || 749 ((dep->de_flag & 750 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 && 751 (TAILQ_EMPTY(&vp->v_dirtyblkhd) || waitfor == MNT_LAZY))) { 752 mtx_unlock(&vp->v_interlock); 753 mtx_lock(&mntvnode_mtx); 754 continue; 755 } 756 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td); 757 if (error) { 758 mtx_lock(&mntvnode_mtx); 759 if (error == ENOENT) 760 goto loop; 761 continue; 762 } 763 error = VOP_FSYNC(vp, cred, waitfor, td); 764 if (error) 765 allerror = error; 766 VOP_UNLOCK(vp, 0, td); 767 vrele(vp); 768 mtx_lock(&mntvnode_mtx); 769 } 770 mtx_unlock(&mntvnode_mtx); 771 772 /* 773 * Flush filesystem control info. 774 */ 775 if (waitfor != MNT_LAZY) { 776 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY, td); 777 error = VOP_FSYNC(pmp->pm_devvp, cred, waitfor, td); 778 if (error) 779 allerror = error; 780 VOP_UNLOCK(pmp->pm_devvp, 0, td); 781 } 782 return (allerror); 783 } 784 785 static int 786 msdosfs_fhtovp(mp, fhp, vpp) 787 struct mount *mp; 788 struct fid *fhp; 789 struct vnode **vpp; 790 { 791 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 792 struct defid *defhp = (struct defid *) fhp; 793 struct denode *dep; 794 int error; 795 796 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 797 if (error) { 798 *vpp = NULLVP; 799 return (error); 800 } 801 *vpp = DETOV(dep); 802 return (0); 803 } 804 805 static int 806 msdosfs_vptofh(vp, fhp) 807 struct vnode *vp; 808 struct fid *fhp; 809 { 810 struct denode *dep; 811 struct defid *defhp; 812 813 dep = VTODE(vp); 814 defhp = (struct defid *)fhp; 815 defhp->defid_len = sizeof(struct defid); 816 defhp->defid_dirclust = dep->de_dirclust; 817 defhp->defid_dirofs = dep->de_diroffset; 818 /* defhp->defid_gen = dep->de_gen; */ 819 return (0); 820 } 821 822 static struct vfsops msdosfs_vfsops = { 823 msdosfs_mount, 824 vfs_stdstart, 825 msdosfs_unmount, 826 msdosfs_root, 827 vfs_stdquotactl, 828 msdosfs_statfs, 829 msdosfs_sync, 830 vfs_stdvget, 831 msdosfs_fhtovp, 832 vfs_stdcheckexp, 833 msdosfs_vptofh, 834 msdosfs_init, 835 msdosfs_uninit, 836 vfs_stdextattrctl, 837 }; 838 839 VFS_SET(msdosfs_vfsops, msdosfs, 0); 840