1 /* $FreeBSD$ */ 2 /* $NetBSD: msdosfs_vfsops.c,v 1.51 1997/11/17 15:36:58 ws Exp $ */ 3 4 /*- 5 * SPDX-License-Identifier: BSD-4-Clause 6 * 7 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. 8 * Copyright (C) 1994, 1995, 1997 TooLs GmbH. 9 * All rights reserved. 10 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by TooLs GmbH. 23 * 4. The name of TooLs GmbH may not be used to endorse or promote products 24 * derived from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 27 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 28 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 29 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 31 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 32 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 33 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 34 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 35 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 36 */ 37 /*- 38 * Written by Paul Popelka (paulp@uts.amdahl.com) 39 * 40 * You can do anything you want with this software, just don't say you wrote 41 * it, and don't remove this notice. 42 * 43 * This software is provided "as is". 44 * 45 * The author supplies this software to be publicly redistributed on the 46 * understanding that the author is not responsible for the correct 47 * functioning of this software in any circumstances and is not liable for 48 * any damages caused by this software. 49 * 50 * October 1992 51 */ 52 53 #include <sys/param.h> 54 #include <sys/systm.h> 55 #include <sys/conf.h> 56 #include <sys/proc.h> 57 #include <sys/nlookup.h> 58 #include <sys/kernel.h> 59 #include <sys/vnode.h> 60 #include <sys/iconv.h> 61 #include <sys/mount.h> 62 #include <sys/buf.h> 63 #include <sys/fcntl.h> 64 #include <sys/malloc.h> 65 #include <sys/stat.h> 66 #include <vm/vm_zone.h> 67 68 #include <sys/buf2.h> 69 70 #include <vfs/msdosfs/bootsect.h> 71 #include <vfs/msdosfs/bpb.h> 72 #include <vfs/msdosfs/direntry.h> 73 #include <vfs/msdosfs/denode.h> 74 #include <vfs/msdosfs/fat.h> 75 #include <vfs/msdosfs/msdosfsmount.h> 76 77 extern struct vop_ops msdosfs_vnode_vops; 78 struct iconv_functions *msdosfs_iconv; 79 80 #define ENCODING_UNICODE "UTF-16BE" 81 #if 1 /*def PC98*/ 82 /* 83 * XXX - The boot signature formatted by NEC PC-98 DOS looks like a 84 * garbage or a random value :-{ 85 * If you want to use that broken-signatured media, define the 86 * following symbol even though PC/AT. 87 * (ex. mount PC-98 DOS formatted FD on PC/AT) 88 */ 89 #define MSDOSFS_NOCHECKSIG 90 #endif 91 92 MALLOC_DEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOSFS mount structure"); 93 static MALLOC_DEFINE(M_MSDOSFSFAT, "MSDOSFS FAT", "MSDOSFS file allocation table"); 94 95 static int mountmsdosfs(struct vnode *devvp, struct mount *mp, 96 struct msdosfs_args *argp); 97 static int msdosfs_root(struct mount *, struct vnode **); 98 static int msdosfs_statfs(struct mount *, struct statfs *, struct ucred *); 99 static int msdosfs_unmount(struct mount *, int); 100 101 static int 102 update_mp(struct mount *mp, struct msdosfs_args *argp) 103 { 104 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 105 int error; 106 char cs_local[ICONV_CSNMAXLEN]; 107 char cs_dos[ICONV_CSNMAXLEN]; 108 109 pmp->pm_gid = argp->gid; 110 pmp->pm_uid = argp->uid; 111 pmp->pm_mask = argp->mask & ALLPERMS; 112 pmp->pm_dirmask = argp->dirmask & ALLPERMS; 113 pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT; 114 115 if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) { 116 memcpy(cs_local, argp->cs_local, sizeof(cs_local)); 117 memcpy(cs_dos, argp->cs_dos, sizeof(cs_dos)); 118 kprintf("local: %s dos: %s\n",argp->cs_local, argp->cs_dos); 119 error = msdosfs_iconv->open(cs_local, ENCODING_UNICODE, 120 &pmp->pm_w2u); 121 if(error) 122 return error; 123 error = msdosfs_iconv->open(ENCODING_UNICODE, cs_local, 124 &pmp->pm_u2w); 125 if(error) 126 return error; 127 error = msdosfs_iconv->open(cs_dos, cs_local, &pmp->pm_u2d); 128 if(error) 129 return error; 130 error = msdosfs_iconv->open(cs_local, cs_dos, &pmp->pm_d2u); 131 if(error) 132 return error; 133 } 134 135 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 136 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 137 else 138 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 139 return 0; 140 } 141 142 /* 143 * mp - path - addr in user space of mount point (ie /usr or whatever) 144 * data - addr in user space of mount params including the name of the block 145 * special file to treat as a filesystem. 146 */ 147 static int 148 msdosfs_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred) 149 { 150 struct vnode *devvp; /* vnode for blk device to mount */ 151 struct msdosfs_args args; /* will hold data from mount request */ 152 /* msdosfs specific mount control block */ 153 struct msdosfsmount *pmp = NULL; 154 size_t size; 155 int error, flags; 156 mode_t accessmode; 157 struct nlookupdata nd; 158 159 error = copyin(data, (caddr_t)&args, sizeof(struct msdosfs_args)); 160 if (error) 161 return (error); 162 /* 163 * If updating, check whether changing from read-only to 164 * read/write; if there is no device name, that's all we do. 165 */ 166 if (mp->mnt_flag & MNT_UPDATE) { 167 pmp = VFSTOMSDOSFS(mp); 168 error = 0; 169 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && 170 (mp->mnt_flag & MNT_RDONLY)) { 171 flags = WRITECLOSE; 172 if (mp->mnt_flag & MNT_FORCE) 173 flags |= FORCECLOSE; 174 error = vflush(mp, 0, flags); 175 if (error == 0) { 176 devvp = pmp->pm_devvp; 177 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 178 VOP_OPEN(devvp, FREAD, FSCRED, NULL); 179 VOP_CLOSE(devvp, FREAD|FWRITE, NULL); 180 vn_unlock(devvp); 181 pmp->pm_flags |= MSDOSFSMNT_RONLY; 182 } 183 } 184 if (!error && (mp->mnt_flag & MNT_RELOAD)) 185 error = EOPNOTSUPP; /* not yet implemented */ 186 if (error) 187 return (error); 188 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && 189 (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 190 /* 191 * If upgrade to read-write by non-root, then verify 192 * that user has necessary permissions on the device. 193 */ 194 devvp = pmp->pm_devvp; 195 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 196 if (cred->cr_uid != 0) { 197 error = VOP_EACCESS(devvp, VREAD | VWRITE, 198 cred); 199 if (error) { 200 vn_unlock(devvp); 201 return (error); 202 } 203 } 204 VOP_OPEN(devvp, FREAD|FWRITE, FSCRED, NULL); 205 VOP_CLOSE(devvp, FREAD, NULL); 206 vn_unlock(devvp); 207 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 208 } 209 if (args.fspec == NULL) { 210 #ifdef __notyet__ /* doesn't work correctly with current mountd XXX */ 211 if (args.flags & MSDOSFSMNT_MNTOPT) { 212 pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT; 213 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT; 214 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 215 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 216 } 217 #endif 218 /* 219 * Process export requests. 220 */ 221 return (vfs_export(mp, &pmp->pm_export, &args.export)); 222 } 223 } 224 /* 225 * Not an update, or updating the name: look up the name 226 * and verify that it refers to a sensible disk device. 227 */ 228 devvp = NULL; 229 error = nlookup_init(&nd, args.fspec, UIO_USERSPACE, NLC_FOLLOW); 230 if (error == 0) 231 error = nlookup(&nd); 232 if (error == 0) 233 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp); 234 nlookup_done(&nd); 235 if (error) 236 return (error); 237 238 if (!vn_isdisk(devvp, &error)) { 239 vrele(devvp); 240 return (error); 241 } 242 /* 243 * If mount by non-root, then verify that user has necessary 244 * permissions on the device. 245 */ 246 if (cred->cr_uid != 0) { 247 accessmode = VREAD; 248 if ((mp->mnt_flag & MNT_RDONLY) == 0) 249 accessmode |= VWRITE; 250 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 251 error = VOP_EACCESS(devvp, accessmode, cred); 252 if (error) { 253 vput(devvp); 254 return (error); 255 } 256 vn_unlock(devvp); 257 } 258 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 259 error = mountmsdosfs(devvp, mp, &args); 260 #ifdef MSDOSFS_DEBUG /* only needed for the kprintf below */ 261 pmp = VFSTOMSDOSFS(mp); 262 #endif 263 } else { 264 if (devvp != pmp->pm_devvp) 265 error = EINVAL; /* XXX needs translation */ 266 else 267 vrele(devvp); 268 } 269 if (error) { 270 vrele(devvp); 271 return (error); 272 } 273 274 error = update_mp(mp, &args); 275 if (error) { 276 if ((mp->mnt_flag & MNT_UPDATE) == 0) 277 msdosfs_unmount(mp, MNT_FORCE); 278 return error; 279 } 280 281 copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size); 282 memset(mp->mnt_stat.f_mntfromname + size, 0, MNAMELEN - size); 283 msdosfs_statfs(mp, &mp->mnt_stat, cred); 284 #ifdef MSDOSFS_DEBUG 285 kprintf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", 286 mp, pmp, pmp->pm_inusemap); 287 #endif 288 return (0); 289 } 290 291 static int 292 mountmsdosfs(struct vnode *devvp, struct mount *mp, struct msdosfs_args *argp) 293 { 294 struct msdosfsmount *pmp; 295 struct buf *bp; 296 cdev_t dev; 297 union bootsector *bsp; 298 struct byte_bpb33 *b33; 299 struct byte_bpb50 *b50; 300 struct byte_bpb710 *b710; 301 uint8_t SecPerClust; 302 u_long clusters; 303 int ronly, error; 304 305 /* 306 * Disallow multiple mounts of the same device. 307 * Disallow mounting of a device that is currently in use 308 * Flush out any old buffers remaining from a previous use. 309 */ 310 error = vfs_mountedon(devvp); 311 if (error) 312 return (error); 313 if (vcount(devvp) > 0) 314 return (EBUSY); 315 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 316 error = vinvalbuf(devvp, V_SAVE, 0, 0); 317 vn_unlock(devvp); 318 if (error) 319 return (error); 320 321 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 322 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 323 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, NULL); 324 vn_unlock(devvp); 325 if (error) 326 return (error); 327 dev = devvp->v_rdev; 328 bp = NULL; /* both used in error_exit */ 329 pmp = NULL; 330 331 /* 332 * Read the boot sector of the filesystem, and then check the 333 * boot signature. If not a dos boot sector then error out. 334 * 335 * NOTE: 8192 is a magic size that works for ffs. 336 */ 337 error = bread(devvp, 0, 8192, &bp); 338 if (error) 339 goto error_exit; 340 bp->b_flags |= B_AGE; 341 bsp = (union bootsector *)bp->b_data; 342 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 343 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 344 b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB; 345 346 #ifndef MSDOSFS_NOCHECKSIG 347 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 || 348 bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 349 error = EINVAL; 350 goto error_exit; 351 } 352 #endif 353 354 pmp = kmalloc(sizeof(*pmp), M_MSDOSFSMNT, M_WAITOK | M_ZERO); 355 pmp->pm_mountp = mp; 356 357 /* 358 * Compute several useful quantities from the bpb in the 359 * bootsector. Copy in the dos 5 variant of the bpb then fix up 360 * the fields that are different between dos 5 and dos 3.3. 361 */ 362 SecPerClust = b50->bpbSecPerClust; 363 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 364 if (pmp->pm_BytesPerSec < DEV_BSIZE) { 365 error = EINVAL; 366 goto error_exit; 367 } 368 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 369 pmp->pm_FATs = b50->bpbFATs; 370 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 371 pmp->pm_Sectors = getushort(b50->bpbSectors); 372 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 373 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 374 pmp->pm_Heads = getushort(b50->bpbHeads); 375 pmp->pm_Media = b50->bpbMedia; 376 377 /* calculate the ratio of sector size to DEV_BSIZE */ 378 pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE; 379 380 /* 381 * We don't check pm_Heads nor pm_SecPerTrack, because 382 * these may not be set for EFI file systems. We don't 383 * use these anyway, so we're unaffected if they are 384 * invalid. 385 */ 386 if (pmp->pm_BytesPerSec == 0 || SecPerClust == 0) { 387 error = EINVAL; 388 goto error_exit; 389 } 390 391 if (pmp->pm_Sectors == 0) { 392 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 393 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 394 } else { 395 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 396 pmp->pm_HugeSectors = pmp->pm_Sectors; 397 } 398 399 if (pmp->pm_RootDirEnts == 0) { 400 if (pmp->pm_FATsecs != 0 || getushort(b710->bpbFSVers) != 0) { 401 error = EINVAL; 402 kprintf("mountmsdosfs(): bad FAT32 filesystem\n"); 403 goto error_exit; 404 } 405 pmp->pm_fatmask = FAT32_MASK; 406 pmp->pm_fatmult = 4; 407 pmp->pm_fatdiv = 1; 408 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 409 if ((getushort(b710->bpbExtFlags) & FATMIRROR) != 0) 410 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 411 else 412 pmp->pm_flags |= MSDOSFS_FATMIRROR; 413 } else 414 pmp->pm_flags |= MSDOSFS_FATMIRROR; 415 416 /* 417 * Check a few values (could do some more): 418 * - logical sector size: power of 2, >= block size 419 * - sectors per cluster: power of 2, >= 1 420 * - number of sectors: >= 1, <= size of partition 421 * - number of FAT sectors: >= 1 422 */ 423 if (SecPerClust == 0 || (SecPerClust & (SecPerClust - 1)) != 0 || 424 pmp->pm_BytesPerSec < DEV_BSIZE || 425 (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) != 0 || 426 pmp->pm_HugeSectors == 0 || pmp->pm_FATsecs == 0 || 427 SecPerClust * pmp->pm_BlkPerSec > MAXBSIZE / DEV_BSIZE) { 428 error = EINVAL; 429 goto error_exit; 430 } 431 432 if ((off_t)pmp->pm_HugeSectors * pmp->pm_BytesPerSec < 433 pmp->pm_HugeSectors /* overflow */) { 434 /* XXX FreeBSD also checks media size in above */ 435 error = EINVAL; 436 goto error_exit; 437 } 438 439 pmp->pm_HugeSectors *= pmp->pm_BlkPerSec; 440 pmp->pm_HiddenSects *= pmp->pm_BlkPerSec; /* XXX not used? */ 441 pmp->pm_FATsecs *= pmp->pm_BlkPerSec; 442 SecPerClust *= pmp->pm_BlkPerSec; 443 444 pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec; 445 446 if (FAT32(pmp)) { 447 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 448 pmp->pm_firstcluster = pmp->pm_fatblk + 449 pmp->pm_FATs * pmp->pm_FATsecs; 450 pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec; 451 } else { 452 pmp->pm_rootdirblk = pmp->pm_fatblk + 453 pmp->pm_FATs * pmp->pm_FATsecs; 454 pmp->pm_rootdirsize = howmany(pmp->pm_RootDirEnts * 455 sizeof(struct direntry), DEV_BSIZE); /* in blocks */ 456 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 457 } 458 459 if (pmp->pm_HugeSectors <= pmp->pm_firstcluster) { 460 error = EINVAL; 461 goto error_exit; 462 } 463 pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 464 SecPerClust + 1; 465 466 if (pmp->pm_fatmask == 0) { 467 if (pmp->pm_maxcluster <= ((CLUST_RSRVD - CLUST_FIRST) & 468 FAT12_MASK)) { 469 /* 470 * This will usually be a floppy disk. This size makes 471 * sure that one FAT entry will not be split across 472 * multiple blocks. 473 */ 474 pmp->pm_fatmask = FAT12_MASK; 475 pmp->pm_fatmult = 3; 476 pmp->pm_fatdiv = 2; 477 } else { 478 pmp->pm_fatmask = FAT16_MASK; 479 pmp->pm_fatmult = 2; 480 pmp->pm_fatdiv = 1; 481 } 482 } 483 484 clusters = ((pmp->pm_FATsecs * DEV_BSIZE) / pmp->pm_fatmult) * 485 pmp->pm_fatdiv; 486 if (pmp->pm_maxcluster >= clusters) { 487 kprintf("Warning: number of clusters (%ld) exceeds FAT " 488 "capacity (%ld)\n", pmp->pm_maxcluster + 1, clusters); 489 pmp->pm_maxcluster = clusters - 1; 490 } 491 492 if (FAT12(pmp)) 493 pmp->pm_fatblocksize = 3 * 512; 494 else 495 pmp->pm_fatblocksize = PAGE_SIZE; 496 pmp->pm_fatblocksize = roundup(pmp->pm_fatblocksize, 497 pmp->pm_BytesPerSec); 498 pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE; 499 pmp->pm_bnshift = DEV_BSHIFT; 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 * DEV_BSIZE; 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)) != 0) { 514 error = EINVAL; 515 goto error_exit; 516 } 517 518 /* 519 * Release the bootsector buffer. 520 */ 521 bp->b_flags |= B_RELBUF; 522 brelse(bp); 523 bp = NULL; 524 525 /* 526 * Check the fsinfo sector if we have one. Silently fix up our 527 * in-core copy of fp->fsinxtfree if it is unknown (0xffffffff) 528 * or too large. Ignore fp->fsinfree for now, since we need to 529 * read the entire FAT anyway to fill the inuse map. 530 */ 531 if (pmp->pm_fsinfo) { 532 struct fsinfo *fp; 533 534 if ((error = bread(devvp, de_bn2doff(pmp, pmp->pm_fsinfo), 535 pmp->pm_BytesPerSec, &bp)) != 0) 536 goto error_exit; 537 fp = (struct fsinfo *)bp->b_data; 538 if (!memcmp(fp->fsisig1, "RRaA", 4) && 539 !memcmp(fp->fsisig2, "rrAa", 4) && 540 !memcmp(fp->fsisig3, "\0\0\125\252", 4)) { 541 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 542 if (pmp->pm_nxtfree > pmp->pm_maxcluster) 543 pmp->pm_nxtfree = CLUST_FIRST; 544 } else 545 pmp->pm_fsinfo = 0; 546 bp->b_flags |= B_RELBUF; 547 brelse(bp); 548 bp = NULL; 549 } 550 551 /* 552 * Finish initializing pmp->pm_nxtfree (just in case the first few 553 * sectors aren't properly reserved in the FAT). This completes 554 * the fixup for fp->fsinxtfree, and fixes up the zero-initialized 555 * value if there is no fsinfo. We will use pmp->pm_nxtfree 556 * internally even if there is no fsinfo. 557 */ 558 if (pmp->pm_nxtfree < CLUST_FIRST) 559 pmp->pm_nxtfree = CLUST_FIRST; 560 561 /* 562 * Allocate memory for the bitmap of allocated clusters, and then 563 * fill it in. 564 */ 565 pmp->pm_inusemap = kmalloc(howmany(pmp->pm_maxcluster + 1, 566 N_INUSEBITS) * sizeof(*pmp->pm_inusemap), M_MSDOSFSFAT, M_WAITOK); 567 568 /* 569 * fillinusemap() needs pm_devvp. 570 */ 571 pmp->pm_devvp = devvp; 572 pmp->pm_dev = dev; 573 574 /* 575 * Have the inuse map filled in. 576 */ 577 MSDOSFS_LOCK_MP(pmp); 578 error = fillinusemap(pmp); 579 MSDOSFS_UNLOCK_MP(pmp); 580 if (error != 0) 581 goto error_exit; 582 583 /* 584 * If they want FAT updates to be synchronous then let them suffer 585 * the performance degradation in exchange for the on disk copy of 586 * the FAT being correct just about all the time. I suppose this 587 * would be a good thing to turn on if the kernel is still flakey. 588 */ 589 if (mp->mnt_flag & MNT_SYNCHRONOUS) 590 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 591 592 /* 593 * Finish up. 594 */ 595 if (ronly) 596 pmp->pm_flags |= MSDOSFSMNT_RONLY; 597 else 598 pmp->pm_fmod = 1; 599 mp->mnt_data = (qaddr_t) pmp; 600 mp->mnt_stat.f_fsid.val[0] = devid_from_dev(dev); 601 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 602 mp->mnt_flag |= MNT_LOCAL; 603 vfs_add_vnodeops(mp, &msdosfs_vnode_vops, &mp->mnt_vn_norm_ops); 604 dev->si_mountpoint = mp; 605 606 return (0); 607 608 error_exit: 609 if (bp != NULL) { 610 bp->b_flags |= B_RELBUF; 611 brelse(bp); 612 } 613 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 614 VOP_CLOSE(devvp, ronly ? FREAD : FREAD | FWRITE, NULL); 615 vn_unlock(devvp); 616 if (pmp != NULL) { 617 if (pmp->pm_inusemap) 618 kfree(pmp->pm_inusemap, M_MSDOSFSFAT); 619 kfree(pmp, M_MSDOSFSMNT); 620 mp->mnt_data = (qaddr_t)0; 621 } 622 return (error); 623 } 624 625 /* 626 * Unmount the filesystem described by mp. 627 */ 628 static int 629 msdosfs_unmount(struct mount *mp, int mntflags) 630 { 631 struct msdosfsmount *pmp; 632 int error, flags; 633 #ifdef MSDOSFS_DEBUG 634 struct vnode *vp; 635 #endif 636 flags = 0; 637 if (mntflags & MNT_FORCE) 638 flags |= FORCECLOSE; 639 error = vflush(mp, 0, flags); 640 if (error) 641 return error; 642 643 pmp = VFSTOMSDOSFS(mp); 644 pmp->pm_devvp->v_rdev->si_mountpoint = NULL; 645 646 if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) { 647 if (pmp->pm_w2u) 648 msdosfs_iconv->close(pmp->pm_w2u); 649 if (pmp->pm_u2w) 650 msdosfs_iconv->close(pmp->pm_u2w); 651 if (pmp->pm_d2u) 652 msdosfs_iconv->close(pmp->pm_d2u); 653 if (pmp->pm_u2d) 654 msdosfs_iconv->close(pmp->pm_u2d); 655 } 656 657 #ifdef MSDOSFS_DEBUG 658 vp = pmp->pm_devvp; 659 kprintf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 660 kprintf("flag %08x, refcnt 0x%08x, writecount %d, auxrefs 0x%08x\n", 661 vp->v_flag, vp->v_refcnt, vp->v_writecount, vp->v_auxrefs); 662 kprintf("mount %p, op %p\n", vp->v_mount, vp->v_ops); 663 kprintf("mount %p\n", vp->v_mount); 664 kprintf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n", 665 RB_ROOT(&vp->v_rbclean_tree), RB_ROOT(&vp->v_rbdirty_tree), 666 bio_track_active(&vp->v_track_write), vp->v_type); 667 kprintf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 668 vp->v_socket, vp->v_tag, ((u_int *)vp->v_data)[0], 669 ((u_int *)vp->v_data)[1]); 670 #endif 671 672 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); 673 error = VOP_CLOSE(pmp->pm_devvp, 674 pmp->pm_flags & MSDOSFSMNT_RONLY ? FREAD : FREAD | FWRITE, 675 NULL); 676 vn_unlock(pmp->pm_devvp); 677 vrele(pmp->pm_devvp); 678 kfree(pmp->pm_inusemap, M_MSDOSFSFAT); 679 kfree(pmp, M_MSDOSFSMNT); 680 mp->mnt_data = (qaddr_t)0; 681 mp->mnt_flag &= ~MNT_LOCAL; 682 return (error); 683 } 684 685 static int 686 msdosfs_root(struct mount *mp, struct vnode **vpp) 687 { 688 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 689 struct denode *ndep; 690 int error; 691 692 mprintf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 693 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep); 694 if (error) 695 return (error); 696 *vpp = DETOV(ndep); 697 return (0); 698 } 699 700 static int 701 msdosfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 702 { 703 struct msdosfsmount *pmp; 704 705 pmp = VFSTOMSDOSFS(mp); 706 sbp->f_bsize = pmp->pm_bpcluster; 707 sbp->f_iosize = pmp->pm_bpcluster; 708 sbp->f_blocks = pmp->pm_maxcluster + 1; 709 sbp->f_bfree = pmp->pm_freeclustercount; 710 sbp->f_bavail = pmp->pm_freeclustercount; 711 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 712 sbp->f_ffree = 0; /* what to put in here? */ 713 if (sbp != &mp->mnt_stat) { 714 sbp->f_type = mp->mnt_vfc->vfc_typenum; 715 memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, MNAMELEN); 716 } 717 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN); 718 return (0); 719 } 720 721 static int 722 msdosfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred) 723 { 724 struct msdosfsmount *pmp; 725 726 pmp = VFSTOMSDOSFS(mp); 727 sbp->f_bsize = pmp->pm_bpcluster; 728 sbp->f_frsize = pmp->pm_bpcluster; 729 sbp->f_blocks = pmp->pm_maxcluster + 1; 730 sbp->f_bfree = pmp->pm_freeclustercount; 731 sbp->f_bavail = pmp->pm_freeclustercount; 732 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 733 sbp->f_ffree = 0; /* what to put in here? */ 734 if (sbp != &mp->mnt_vstat) { 735 sbp->f_type = mp->mnt_vfc->vfc_typenum; 736 } 737 return (0); 738 } 739 740 struct scaninfo { 741 int rescan; 742 int allerror; 743 int waitfor; 744 }; 745 746 static int msdosfs_sync_scan(struct mount *mp, struct vnode *vp, void *data); 747 748 /* 749 * If we have an FSInfo block, update it. 750 */ 751 static int 752 msdosfs_fsiflush(struct msdosfsmount *pmp, int waitfor) 753 { 754 struct fsinfo *fp; 755 struct buf *bp; 756 int error; 757 758 MSDOSFS_LOCK_MP(pmp); 759 if (pmp->pm_fsinfo == 0 || (pmp->pm_flags & MSDOSFS_FSIMOD) == 0) { 760 error = 0; 761 goto unlock; 762 } 763 error = bread(pmp->pm_devvp, de_bn2doff(pmp, pmp->pm_fsinfo), 764 pmp->pm_BytesPerSec, &bp); 765 if (error != 0) { 766 brelse(bp); 767 goto unlock; 768 } 769 770 fp = (struct fsinfo *)bp->b_data; 771 putulong(fp->fsinfree, pmp->pm_freeclustercount); 772 putulong(fp->fsinxtfree, pmp->pm_nxtfree); 773 pmp->pm_flags &= ~MSDOSFS_FSIMOD; 774 if (waitfor == MNT_WAIT) 775 error = bwrite(bp); 776 else 777 bawrite(bp); 778 unlock: 779 MSDOSFS_UNLOCK_MP(pmp); 780 return (error); 781 } 782 783 static int 784 msdosfs_sync(struct mount *mp, int waitfor) 785 { 786 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 787 struct scaninfo scaninfo; 788 int error; 789 790 /* 791 * If we ever switch to not updating all of the FATs all the time, 792 * this would be the place to update them from the first one. 793 */ 794 if (pmp->pm_fmod != 0) { 795 if (pmp->pm_flags & MSDOSFSMNT_RONLY) { 796 panic("msdosfs_sync: rofs mod"); 797 } else { 798 /* update FATs here */ 799 } 800 } 801 /* 802 * Write back each (modified) denode. 803 */ 804 scaninfo.allerror = 0; 805 scaninfo.rescan = 1; 806 while (scaninfo.rescan) { 807 scaninfo.rescan = 0; 808 vmntvnodescan(mp, VMSC_GETVP|VMSC_NOWAIT, NULL, 809 msdosfs_sync_scan, &scaninfo); 810 } 811 812 /* 813 * Flush filesystem control info. 814 */ 815 if ((waitfor & MNT_LAZY) == 0) { 816 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); 817 if ((error = VOP_FSYNC(pmp->pm_devvp, waitfor, 0)) != 0) 818 scaninfo.allerror = error; 819 vn_unlock(pmp->pm_devvp); 820 } 821 822 error = msdosfs_fsiflush(pmp, waitfor); 823 if (error != 0) 824 scaninfo.allerror = error; 825 return (scaninfo.allerror); 826 } 827 828 static int 829 msdosfs_sync_scan(struct mount *mp, struct vnode *vp, void *data) 830 { 831 struct scaninfo *info = data; 832 struct denode *dep; 833 int error; 834 835 dep = VTODE(vp); 836 if (vp->v_type == VNON || vp->v_type == VBAD || 837 ((dep->de_flag & 838 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 && 839 (RB_EMPTY(&vp->v_rbdirty_tree) || (info->waitfor & MNT_LAZY)))) { 840 return(0); 841 } 842 if ((error = VOP_FSYNC(vp, info->waitfor, 0)) != 0) 843 info->allerror = error; 844 return(0); 845 } 846 847 static int 848 msdosfs_fhtovp(struct mount *mp, struct vnode *rootvp, 849 struct fid *fhp, struct vnode **vpp) 850 { 851 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 852 struct defid *defhp = (struct defid *) fhp; 853 struct denode *dep; 854 int error; 855 856 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 857 if (error) { 858 *vpp = NULLVP; 859 return (error); 860 } 861 *vpp = DETOV(dep); 862 return (0); 863 } 864 865 static int 866 msdosfs_checkexp(struct mount *mp, struct sockaddr *nam, int *exflagsp, 867 struct ucred **credanonp) 868 { 869 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 870 struct netcred *np; 871 872 np = vfs_export_lookup(mp, &pmp->pm_export, nam); 873 if (np == NULL) 874 return (EACCES); 875 *exflagsp = np->netc_exflags; 876 *credanonp = &np->netc_anon; 877 return (0); 878 } 879 880 static int 881 msdosfs_vptofh(struct vnode *vp, struct fid *fhp) 882 { 883 struct denode *dep; 884 struct defid *defhp; 885 886 dep = VTODE(vp); 887 defhp = (struct defid *)fhp; 888 defhp->defid_len = sizeof(struct defid); 889 defhp->defid_dirclust = dep->de_dirclust; 890 defhp->defid_dirofs = dep->de_diroffset; 891 /* defhp->defid_gen = dep->de_gen; */ 892 return (0); 893 } 894 895 static struct vfsops msdosfs_vfsops = { 896 .vfs_flags = 0, 897 .vfs_mount = msdosfs_mount, 898 .vfs_root = msdosfs_root, 899 .vfs_statfs = msdosfs_statfs, 900 .vfs_statvfs = msdosfs_statvfs, 901 .vfs_sync = msdosfs_sync, 902 .vfs_fhtovp = msdosfs_fhtovp, 903 .vfs_checkexp = msdosfs_checkexp, 904 .vfs_vptofh = msdosfs_vptofh, 905 .vfs_init = msdosfs_init, 906 .vfs_uninit = msdosfs_uninit, 907 .vfs_unmount = msdosfs_unmount, 908 }; 909 910 VFS_SET(msdosfs_vfsops, msdos, 0); 911 MODULE_VERSION(msdos, 1); 912