1 /* $NetBSD: msdosfs_vnops.c,v 1.114 2026/09/26 22:04:55 riastradh Exp $ */ 2 3 /*- 4 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. 5 * Copyright (C) 1994, 1995, 1997 TooLs GmbH. 6 * All rights reserved. 7 * Original code by Paul Popelka (paulp (at) uts.amdahl.com) (see below). 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by TooLs GmbH. 20 * 4. The name of TooLs GmbH may not be used to endorse or promote products 21 * derived from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 27 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 28 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 29 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 30 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 31 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 32 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 /* 35 * Written by Paul Popelka (paulp (at) uts.amdahl.com) 36 * 37 * You can do anything you want with this software, just don't say you wrote 38 * it, and don't remove this notice. 39 * 40 * This software is provided "as is". 41 * 42 * The author supplies this software to be publicly redistributed on the 43 * understanding that the author is not responsible for the correct 44 * functioning of this software in any circumstances and is not liable for 45 * any damages caused by this software. 46 * 47 * October 1992 48 */ 49 50 #include <sys/cdefs.h> 51 __KERNEL_RCSID(0, "$NetBSD: msdosfs_vnops.c,v 1.114 2026/09/26 22:04:55 riastradh Exp $"); 52 53 #include <sys/param.h> 54 #include <sys/systm.h> 55 #include <sys/namei.h> 56 #include <sys/resourcevar.h> /* defines plimit structure in proc struct */ 57 #include <sys/kernel.h> 58 #include <sys/file.h> /* define FWRITE ... */ 59 #include <sys/stat.h> 60 #include <sys/buf.h> 61 #include <sys/proc.h> 62 #include <sys/mount.h> 63 #include <sys/vnode.h> 64 #include <sys/signalvar.h> 65 #include <sys/malloc.h> 66 #include <sys/dirent.h> 67 #include <sys/lockf.h> 68 #include <sys/kauth.h> 69 70 #include <miscfs/genfs/genfs.h> 71 #include <miscfs/specfs/specdev.h> /* XXX */ /* defines v_rdev */ 72 73 #include <uvm/uvm_extern.h> 74 75 #include <fs/msdosfs/bpb.h> 76 #include <fs/msdosfs/direntry.h> 77 #include <fs/msdosfs/denode.h> 78 #include <fs/msdosfs/msdosfsmount.h> 79 #include <fs/msdosfs/fat.h> 80 81 /* 82 * Some general notes: 83 * 84 * In the ufs filesystem the inodes, superblocks, and indirect blocks are 85 * read/written using the vnode for the filesystem. Blocks that represent 86 * the contents of a file are read/written using the vnode for the file 87 * (including directories when they are read/written as files). This 88 * presents problems for the dos filesystem because data that should be in 89 * an inode (if dos had them) resides in the directory itself. Since we 90 * must update directory entries without the benefit of having the vnode 91 * for the directory we must use the vnode for the filesystem. This means 92 * that when a directory is actually read/written (via read, write, or 93 * readdir, or seek) we must use the vnode for the filesystem instead of 94 * the vnode for the directory as would happen in ufs. This is to insure we 95 * retrieve the correct block from the buffer cache since the hash value is 96 * based upon the vnode address and the desired block number. 97 */ 98 99 /* 100 * Create a regular file. On entry the directory to contain the file being 101 * created is locked. We must release before we return. 102 */ 103 int 104 msdosfs_create(void *v) 105 { 106 struct vop_create_v3_args /* { 107 struct vnode *a_dvp; 108 struct vnode **a_vpp; 109 struct componentname *a_cnp; 110 struct vattr *a_vap; 111 } */ *ap = v; 112 struct componentname *cnp = ap->a_cnp; 113 struct denode ndirent; 114 struct denode *dep; 115 struct denode *pdep = VTODE(ap->a_dvp); 116 int error; 117 118 #ifdef MSDOSFS_DEBUG 119 printf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap); 120 #endif 121 122 /* 123 * If this is the root directory and there is no space left we 124 * can't do anything. This is because the root directory can not 125 * change size. 126 */ 127 if (pdep->de_StartCluster == MSDOSFSROOT 128 && pdep->de_crap.mlr_fndoffset >= pdep->de_FileSize) { 129 error = ENOSPC; 130 goto bad; 131 } 132 133 /* 134 * Create a directory entry for the file, then call createde() to 135 * have it installed. NOTE: DOS files are always executable. We 136 * use the absence of the owner write bit to make the file 137 * readonly. 138 */ 139 memset(&ndirent, 0, sizeof(ndirent)); 140 if ((error = msdosfs_uniqdosname(pdep, cnp, ndirent.de_Name)) != 0) 141 goto bad; 142 143 ndirent.de_Attributes = (ap->a_vap->va_mode & S_IWUSR) ? 144 ATTR_ARCHIVE : ATTR_ARCHIVE | ATTR_READONLY; 145 ndirent.de_StartCluster = 0; 146 ndirent.de_FileSize = 0; 147 ndirent.de_dev = pdep->de_dev; 148 ndirent.de_devvp = pdep->de_devvp; 149 ndirent.de_pmp = pdep->de_pmp; 150 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 151 DETIMES(&ndirent, NULL, NULL, NULL, pdep->de_pmp->pm_gmtoff); 152 if ((error = msdosfs_createde(&ndirent, pdep, &pdep->de_crap, &dep, 153 cnp)) != 0) 154 goto bad; 155 *ap->a_vpp = DETOV(dep); 156 cache_enter(ap->a_dvp, *ap->a_vpp, cnp->cn_nameptr, cnp->cn_namelen, 157 cnp->cn_flags); 158 return (0); 159 160 bad: 161 return (error); 162 } 163 164 int 165 msdosfs_close(void *v) 166 { 167 struct vop_close_args /* { 168 struct vnode *a_vp; 169 int a_fflag; 170 kauth_cred_t a_cred; 171 } */ *ap = v; 172 struct vnode *vp = ap->a_vp; 173 struct denode *dep = VTODE(vp); 174 175 mutex_enter(vp->v_interlock); 176 if (vrefcnt(vp) > 1) 177 DETIMES(dep, NULL, NULL, NULL, dep->de_pmp->pm_gmtoff); 178 mutex_exit(vp->v_interlock); 179 return (0); 180 } 181 182 static int 183 msdosfs_check_possible(struct vnode *vp, struct denode *dep, accmode_t accmode) 184 { 185 186 /* 187 * Disallow write attempts on read-only file systems; 188 * unless the file is a socket, fifo, or a block or 189 * character device resident on the file system. 190 */ 191 if (accmode & VWRITE) { 192 switch (vp->v_type) { 193 case VDIR: 194 case VLNK: 195 case VREG: 196 if (vp->v_mount->mnt_flag & MNT_RDONLY) 197 return (EROFS); 198 default: 199 break; 200 } 201 } 202 203 return 0; 204 } 205 206 static int 207 msdosfs_check_permitted(struct vnode *vp, struct denode *dep, accmode_t accmode, 208 kauth_cred_t cred) 209 { 210 struct msdosfsmount *pmp = dep->de_pmp; 211 mode_t file_mode; 212 213 if ((dep->de_Attributes & ATTR_READONLY) == 0) 214 file_mode = S_IRWXU|S_IRWXG|S_IRWXO; 215 else 216 file_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 217 218 file_mode &= (vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); 219 220 return kauth_authorize_vnode(cred, KAUTH_ACCESS_ACTION(accmode, 221 vp->v_type, file_mode), vp, NULL, genfs_can_access(vp, cred, 222 pmp->pm_uid, pmp->pm_gid, file_mode, NULL, accmode)); 223 } 224 225 int 226 msdosfs_access(void *v) 227 { 228 struct vop_access_args /* { 229 struct vnode *a_vp; 230 accmode_t a_accmode; 231 kauth_cred_t a_cred; 232 } */ *ap = v; 233 struct vnode *vp = ap->a_vp; 234 struct denode *dep = VTODE(vp); 235 int error; 236 237 error = msdosfs_check_possible(vp, dep, ap->a_accmode); 238 if (error) 239 return error; 240 241 error = msdosfs_check_permitted(vp, dep, ap->a_accmode, ap->a_cred); 242 243 return error; 244 } 245 246 int 247 msdosfs_getattr(void *v) 248 { 249 struct vop_getattr_args /* { 250 struct vnode *a_vp; 251 struct vattr *a_vap; 252 kauth_cred_t a_cred; 253 } */ *ap = v; 254 struct denode *dep = VTODE(ap->a_vp); 255 struct msdosfsmount *pmp = dep->de_pmp; 256 struct vattr *vap = ap->a_vap; 257 mode_t mode; 258 u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 259 ino_t fileid; 260 261 DETIMES(dep, NULL, NULL, NULL, pmp->pm_gmtoff); 262 vap->va_fsid = dep->de_dev; 263 /* 264 * The following computation of the fileid must be the same as that 265 * used in msdosfs_readdir() to compute d_fileno. If not, pwd 266 * doesn't work. 267 */ 268 if (dep->de_Attributes & ATTR_DIRECTORY) { 269 fileid = cntobn(pmp, (ino_t)dep->de_StartCluster) * dirsperblk; 270 if (dep->de_StartCluster == MSDOSFSROOT) 271 fileid = 1; 272 } else { 273 fileid = cntobn(pmp, (ino_t)dep->de_dirclust) * dirsperblk; 274 if (dep->de_dirclust == MSDOSFSROOT) 275 fileid = roottobn(pmp, 0) * dirsperblk; 276 fileid += dep->de_diroffset / sizeof(struct direntry); 277 } 278 vap->va_fileid = fileid; 279 if ((dep->de_Attributes & ATTR_READONLY) == 0) 280 mode = S_IRWXU|S_IRWXG|S_IRWXO; 281 else 282 mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 283 vap->va_mode = 284 mode & (ap->a_vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); 285 vap->va_uid = pmp->pm_uid; 286 vap->va_gid = pmp->pm_gid; 287 vap->va_nlink = 1; 288 vap->va_rdev = 0; 289 vap->va_size = ap->a_vp->v_size; 290 msdosfs_dos2unixtime(dep->de_MDate, dep->de_MTime, 0, pmp->pm_gmtoff, 291 &vap->va_mtime); 292 if (dep->de_pmp->pm_flags & MSDOSFSMNT_LONGNAME) { 293 msdosfs_dos2unixtime(dep->de_ADate, 0, 0, pmp->pm_gmtoff, 294 &vap->va_atime); 295 msdosfs_dos2unixtime(dep->de_CDate, dep->de_CTime, dep->de_CHun, 296 pmp->pm_gmtoff, &vap->va_birthtime); 297 } else { 298 vap->va_atime = vap->va_mtime; 299 vap->va_birthtime = vap->va_mtime; 300 } 301 /* msdos has no separate attribute change timestamps. */ 302 vap->va_ctime = vap->va_mtime; 303 vap->va_flags = 0; 304 if ((dep->de_Attributes & ATTR_ARCHIVE) == 0) { 305 vap->va_flags |= SF_ARCHIVED; 306 vap->va_mode |= S_ARCH1; 307 } 308 vap->va_gen = 0; 309 vap->va_blocksize = pmp->pm_bpcluster; 310 vap->va_bytes = 311 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask; 312 vap->va_type = ap->a_vp->v_type; 313 return (0); 314 } 315 316 int 317 msdosfs_setattr(void *v) 318 { 319 struct vop_setattr_args /* { 320 struct vnode *a_vp; 321 struct vattr *a_vap; 322 kauth_cred_t a_cred; 323 } */ *ap = v; 324 int error = 0, de_changed = 0; 325 struct denode *dep = VTODE(ap->a_vp); 326 struct msdosfsmount *pmp = dep->de_pmp; 327 struct vnode *vp = ap->a_vp; 328 struct vattr *vap = ap->a_vap; 329 kauth_cred_t cred = ap->a_cred; 330 331 #ifdef MSDOSFS_DEBUG 332 printf("msdosfs_setattr(): vp %p, vap %p, cred %p\n", 333 ap->a_vp, vap, cred); 334 #endif 335 /* 336 * Note we silently ignore uid or gid changes. 337 */ 338 if ((vap->va_type != VNON) || (vap->va_nlink != (nlink_t)VNOVAL) || 339 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 340 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 341 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL) || 342 (vap->va_uid != VNOVAL && vap->va_uid != pmp->pm_uid) || 343 (vap->va_gid != VNOVAL && vap->va_gid != pmp->pm_gid)) { 344 #ifdef MSDOSFS_DEBUG 345 printf("msdosfs_setattr(): returning EINVAL\n"); 346 printf(" va_type %d, va_nlink %x, va_fsid %"PRIx64", va_fileid %llx\n", 347 vap->va_type, vap->va_nlink, vap->va_fsid, 348 (unsigned long long)vap->va_fileid); 349 printf(" va_blocksize %lx, va_rdev %"PRIx64", va_bytes %"PRIx64", va_gen %lx\n", 350 vap->va_blocksize, vap->va_rdev, vap->va_bytes, vap->va_gen); 351 #endif 352 return (EINVAL); 353 } 354 /* 355 * Silently ignore attributes modifications on directories. 356 */ 357 if (ap->a_vp->v_type == VDIR) 358 return 0; 359 360 if (vap->va_size != VNOVAL) { 361 if (vp->v_mount->mnt_flag & MNT_RDONLY) { 362 error = EROFS; 363 goto bad; 364 } 365 error = msdosfs_detrunc(dep, (u_long)vap->va_size, 0, cred); 366 if (error) 367 goto bad; 368 de_changed = 1; 369 } 370 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 371 if (vp->v_mount->mnt_flag & MNT_RDONLY) { 372 error = EROFS; 373 goto bad; 374 } 375 error = kauth_authorize_vnode(cred, KAUTH_VNODE_WRITE_TIMES, 376 ap->a_vp, NULL, genfs_can_chtimes(ap->a_vp, cred, 377 pmp->pm_uid, vap->va_vaflags)); 378 if (error) 379 goto bad; 380 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 && 381 vap->va_atime.tv_sec != VNOVAL) 382 msdosfs_unix2dostime(&vap->va_atime, pmp->pm_gmtoff, 383 &dep->de_ADate, NULL, NULL); 384 if (vap->va_mtime.tv_sec != VNOVAL) 385 msdosfs_unix2dostime(&vap->va_mtime, pmp->pm_gmtoff, 386 &dep->de_MDate, &dep->de_MTime, NULL); 387 if (vap->va_birthtime.tv_sec != VNOVAL) 388 msdosfs_unix2dostime(&vap->va_mtime, pmp->pm_gmtoff, 389 &dep->de_CDate, &dep->de_CTime, &dep->de_CHun); 390 dep->de_Attributes |= ATTR_ARCHIVE; 391 dep->de_flag |= DE_MODIFIED; 392 de_changed = 1; 393 } 394 /* 395 * DOS files only have the ability to have their writability 396 * attribute set, so we use the owner write bit to set the readonly 397 * attribute. 398 */ 399 if (vap->va_mode != (mode_t)VNOVAL) { 400 if (vp->v_mount->mnt_flag & MNT_RDONLY) { 401 error = EROFS; 402 goto bad; 403 } 404 error = kauth_authorize_vnode(cred, KAUTH_VNODE_WRITE_FLAGS, vp, 405 NULL, genfs_can_chflags(vp, cred, pmp->pm_uid, false)); 406 if (error) 407 goto bad; 408 /* We ignore the read and execute bits. */ 409 if (vap->va_mode & S_IWUSR) 410 dep->de_Attributes &= ~ATTR_READONLY; 411 else 412 dep->de_Attributes |= ATTR_READONLY; 413 dep->de_flag |= DE_MODIFIED; 414 de_changed = 1; 415 } 416 /* 417 * Allow the `archived' bit to be toggled. 418 */ 419 if (vap->va_flags != VNOVAL) { 420 if (vp->v_mount->mnt_flag & MNT_RDONLY) { 421 error = EROFS; 422 goto bad; 423 } 424 error = kauth_authorize_vnode(cred, KAUTH_VNODE_WRITE_FLAGS, vp, 425 NULL, genfs_can_chflags(vp, cred, pmp->pm_uid, false)); 426 if (error) 427 goto bad; 428 if (vap->va_flags & SF_ARCHIVED) 429 dep->de_Attributes &= ~ATTR_ARCHIVE; 430 else 431 dep->de_Attributes |= ATTR_ARCHIVE; 432 dep->de_flag |= DE_MODIFIED; 433 de_changed = 1; 434 } 435 436 if (de_changed) { 437 error = msdosfs_deupdat(dep, 1); 438 if (error) 439 goto bad; 440 } 441 442 bad: 443 return error; 444 } 445 446 int 447 msdosfs_read(void *v) 448 { 449 struct vop_read_args /* { 450 struct vnode *a_vp; 451 struct uio *a_uio; 452 int a_ioflag; 453 kauth_cred_t a_cred; 454 } */ *ap = v; 455 int error = 0; 456 int64_t diff; 457 int blsize; 458 long n; 459 long on; 460 daddr_t lbn; 461 vsize_t bytelen; 462 struct buf *bp; 463 struct vnode *vp = ap->a_vp; 464 struct denode *dep = VTODE(vp); 465 struct msdosfsmount *pmp = dep->de_pmp; 466 struct uio *uio = ap->a_uio; 467 468 /* 469 * If they didn't ask for any data, then we are done. 470 */ 471 472 if (uio->uio_resid == 0) 473 return (0); 474 if (uio->uio_offset < 0) 475 return (EINVAL); 476 if (uio->uio_offset >= dep->de_FileSize) 477 return (0); 478 479 if (vp->v_type == VREG) { 480 const int advice = IO_ADV_DECODE(ap->a_ioflag); 481 482 while (uio->uio_resid > 0) { 483 bytelen = MIN(dep->de_FileSize - uio->uio_offset, 484 uio->uio_resid); 485 486 if (bytelen == 0) 487 break; 488 error = ubc_uiomove(&vp->v_uobj, uio, bytelen, advice, 489 UBC_READ | UBC_PARTIALOK | UBC_VNODE_FLAGS(vp)); 490 if (error) 491 break; 492 } 493 dep->de_flag |= DE_ACCESS; 494 goto out; 495 } 496 497 /* this loop is only for directories now */ 498 do { 499 lbn = de_cluster(pmp, uio->uio_offset); 500 on = uio->uio_offset & pmp->pm_crbomask; 501 n = MIN(pmp->pm_bpcluster - on, uio->uio_resid); 502 if (uio->uio_offset >= dep->de_FileSize) { 503 return (0); 504 } 505 /* file size (and hence diff) may be up to 4GB */ 506 diff = dep->de_FileSize - uio->uio_offset; 507 if (diff < n) 508 n = (long) diff; 509 510 /* convert cluster # to sector # */ 511 error = msdosfs_pcbmap(dep, lbn, &lbn, 0, &blsize); 512 if (error) 513 goto bad; 514 515 /* 516 * If we are operating on a directory file then be sure to 517 * do i/o with the vnode for the filesystem instead of the 518 * vnode for the directory. 519 */ 520 error = bread(pmp->pm_devvp, de_bn2kb(pmp, lbn), blsize, 521 0, &bp); 522 if (error) { 523 goto bad; 524 } 525 n = MIN(n, pmp->pm_bpcluster - bp->b_resid); 526 error = uiomove((char *)bp->b_data + on, (int) n, uio); 527 brelse(bp, 0); 528 } while (error == 0 && uio->uio_resid > 0 && n != 0); 529 530 out: 531 if ((ap->a_ioflag & IO_SYNC) == IO_SYNC) { 532 int uerror; 533 534 uerror = msdosfs_deupdat(dep, 1); 535 if (error == 0) 536 error = uerror; 537 } 538 bad: 539 return (error); 540 } 541 542 /* 543 * Write data to a file or directory. 544 */ 545 int 546 msdosfs_write(void *v) 547 { 548 struct vop_write_args /* { 549 struct vnode *a_vp; 550 struct uio *a_uio; 551 int a_ioflag; 552 kauth_cred_t a_cred; 553 } */ *ap = v; 554 int resid; 555 int error = 0; 556 int ioflag = ap->a_ioflag; 557 u_long osize; 558 u_long count; 559 vsize_t bytelen; 560 off_t oldoff; 561 size_t rem; 562 struct uio *uio = ap->a_uio; 563 struct vnode *vp = ap->a_vp; 564 struct denode *dep = VTODE(vp); 565 struct msdosfsmount *pmp = dep->de_pmp; 566 kauth_cred_t cred = ap->a_cred; 567 bool async; 568 569 #ifdef MSDOSFS_DEBUG 570 printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n", 571 vp, uio, ioflag, cred); 572 printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n", 573 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster); 574 #endif 575 576 switch (vp->v_type) { 577 case VREG: 578 if (ioflag & IO_APPEND) 579 uio->uio_offset = dep->de_FileSize; 580 break; 581 case VDIR: 582 return EISDIR; 583 default: 584 panic("msdosfs_write(): bad file type"); 585 } 586 587 if (uio->uio_offset < 0) 588 return (EINVAL); 589 590 if (uio->uio_resid == 0) 591 return (0); 592 593 /* Don't bother to try to write files larger than the fs limit */ 594 if (uio->uio_offset + uio->uio_resid > MSDOSFS_FILESIZE_MAX) 595 return (EFBIG); 596 597 /* 598 * If the offset we are starting the write at is beyond the end of 599 * the file, then they've done a seek. Unix filesystems allow 600 * files with holes in them, DOS doesn't so we must fill the hole 601 * with zeroed blocks. 602 */ 603 if (uio->uio_offset > dep->de_FileSize) { 604 if ((error = msdosfs_deextend(dep, uio->uio_offset, 605 cred)) != 0) { 606 return (error); 607 } 608 } 609 610 /* 611 * Remember some values in case the write fails. 612 */ 613 async = vp->v_mount->mnt_flag & MNT_ASYNC; 614 resid = uio->uio_resid; 615 osize = dep->de_FileSize; 616 617 /* 618 * If we write beyond the end of the file, extend it to its ultimate 619 * size ahead of the time to hopefully get a contiguous area. 620 */ 621 if (uio->uio_offset + resid > osize) { 622 count = de_clcount(pmp, uio->uio_offset + resid) - 623 de_clcount(pmp, osize); 624 if ((error = msdosfs_extendfile(dep, count, NULL, NULL, 0))) 625 goto errexit; 626 627 dep->de_FileSize = uio->uio_offset + resid; 628 /* hint uvm to not read in extended part */ 629 uvm_vnp_setwritesize(vp, dep->de_FileSize); 630 /* zero out the remainder of the last page */ 631 rem = round_page(dep->de_FileSize) - dep->de_FileSize; 632 if (rem > 0) 633 ubc_zerorange(&vp->v_uobj, (off_t)dep->de_FileSize, 634 rem, UBC_VNODE_FLAGS(vp)); 635 } 636 637 do { 638 oldoff = uio->uio_offset; 639 bytelen = uio->uio_resid; 640 641 error = ubc_uiomove(&vp->v_uobj, uio, bytelen, 642 IO_ADV_DECODE(ioflag), UBC_WRITE | UBC_VNODE_FLAGS(vp)); 643 if (error) 644 break; 645 646 /* 647 * flush what we just wrote if necessary. 648 * XXXUBC simplistic async flushing. 649 */ 650 651 if (!async && oldoff >> 16 != uio->uio_offset >> 16) { 652 rw_enter(vp->v_uobj.vmobjlock, RW_WRITER); 653 error = VOP_PUTPAGES(vp, (oldoff >> 16) << 16, 654 (uio->uio_offset >> 16) << 16, 655 PGO_CLEANIT | PGO_LAZY); 656 } 657 } while (error == 0 && uio->uio_resid > 0); 658 659 /* set final size */ 660 uvm_vnp_setsize(vp, dep->de_FileSize); 661 if (error == 0 && ioflag & IO_SYNC) { 662 rw_enter(vp->v_uobj.vmobjlock, RW_WRITER); 663 error = VOP_PUTPAGES(vp, trunc_page(oldoff), 664 round_page(oldoff + bytelen), PGO_CLEANIT | PGO_SYNCIO); 665 } 666 dep->de_flag |= DE_UPDATE; 667 668 /* 669 * If the write failed and they want us to, truncate the file back 670 * to the size it was before the write was attempted. 671 */ 672 errexit: 673 if (error) { 674 msdosfs_detrunc(dep, osize, ioflag & IO_SYNC, NOCRED); 675 uio->uio_offset -= resid - uio->uio_resid; 676 uio->uio_resid = resid; 677 } else if ((ioflag & IO_SYNC) == IO_SYNC) 678 error = msdosfs_deupdat(dep, 1); 679 KASSERT(vp->v_size == dep->de_FileSize); 680 return (error); 681 } 682 683 int 684 msdosfs_update(struct vnode *vp, const struct timespec *acc, 685 const struct timespec *mod, int flags) 686 { 687 struct buf *bp; 688 struct direntry *dirp; 689 struct denode *dep; 690 int error; 691 692 if (vp->v_mount->mnt_flag & MNT_RDONLY) 693 return (0); 694 dep = VTODE(vp); 695 DETIMES(dep, acc, mod, NULL, dep->de_pmp->pm_gmtoff); 696 if ((dep->de_flag & DE_MODIFIED) == 0) 697 return (0); 698 dep->de_flag &= ~DE_MODIFIED; 699 if (dep->de_Attributes & ATTR_DIRECTORY) 700 return (0); 701 if (dep->de_refcnt <= 0) 702 return (0); 703 error = msdosfs_readde(dep, &bp, &dirp); 704 if (error) 705 return (error); 706 DE_EXTERNALIZE(dirp, dep); 707 if (flags & (UPDATE_WAIT|UPDATE_DIROP)) 708 return (bwrite(bp)); 709 else { 710 bdwrite(bp); 711 return (0); 712 } 713 } 714 715 int 716 msdosfs_remove(void *v) 717 { 718 struct vop_remove_v3_args /* { 719 struct vnode *a_dvp; 720 struct vnode *a_vp; 721 struct componentname *a_cnp; 722 nlink_t ctx_vp_new_nlink; 723 } */ *ap = v; 724 struct denode *dep = VTODE(ap->a_vp); 725 struct denode *ddep = VTODE(ap->a_dvp); 726 int error; 727 728 if (ap->a_vp->v_type == VDIR) 729 error = EPERM; 730 else 731 error = msdosfs_removede(ddep, dep, &ddep->de_crap); 732 #ifdef MSDOSFS_DEBUG 733 printf("msdosfs_remove(), dep %p, usecount %d\n", 734 dep, vrefcnt(ap->a_vp)); 735 #endif 736 if (ddep == dep) 737 vrele(ap->a_vp); 738 else 739 vput(ap->a_vp); /* causes msdosfs_inactive() to be called 740 * via vrele() */ 741 742 return (error); 743 } 744 745 static const struct { 746 struct direntry dot; 747 struct direntry dotdot; 748 } dosdirtemplate = { 749 { ". ", " ", /* the . entry */ 750 ATTR_DIRECTORY, /* file attribute */ 751 0, /* reserved */ 752 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 753 { 0, 0 }, /* access date */ 754 { 0, 0 }, /* high bits of start cluster */ 755 { 210, 4 }, { 210, 4 }, /* modify time & date */ 756 { 0, 0 }, /* startcluster */ 757 { 0, 0, 0, 0 } /* filesize */ 758 }, 759 { ".. ", " ", /* the .. entry */ 760 ATTR_DIRECTORY, /* file attribute */ 761 0, /* reserved */ 762 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 763 { 0, 0 }, /* access date */ 764 { 0, 0 }, /* high bits of start cluster */ 765 { 210, 4 }, { 210, 4 }, /* modify time & date */ 766 { 0, 0 }, /* startcluster */ 767 { 0, 0, 0, 0 } /* filesize */ 768 } 769 }; 770 771 int 772 msdosfs_mkdir(void *v) 773 { 774 struct vop_mkdir_v3_args /* { 775 struct vnode *a_dvp; 776 struvt vnode **a_vpp; 777 struvt componentname *a_cnp; 778 struct vattr *a_vap; 779 } */ *ap = v; 780 struct componentname *cnp = ap->a_cnp; 781 struct denode ndirent; 782 struct denode *dep; 783 struct denode *pdep = VTODE(ap->a_dvp); 784 int error; 785 int bn; 786 u_long newcluster, pcl; 787 daddr_t lbn; 788 struct direntry *denp; 789 struct msdosfsmount *pmp = pdep->de_pmp; 790 struct buf *bp; 791 int async = pdep->de_pmp->pm_mountp->mnt_flag & MNT_ASYNC; 792 793 /* 794 * If this is the root directory and there is no space left we 795 * can't do anything. This is because the root directory can not 796 * change size. 797 */ 798 if (pdep->de_StartCluster == MSDOSFSROOT 799 && pdep->de_crap.mlr_fndoffset >= pdep->de_FileSize) { 800 error = ENOSPC; 801 goto bad2; 802 } 803 804 /* 805 * Allocate a cluster to hold the about to be created directory. 806 */ 807 error = msdosfs_clusteralloc(pmp, 0, 1, &newcluster, NULL); 808 if (error) 809 goto bad2; 810 811 memset(&ndirent, 0, sizeof(ndirent)); 812 ndirent.de_pmp = pmp; 813 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 814 DETIMES(&ndirent, NULL, NULL, NULL, pmp->pm_gmtoff); 815 816 /* 817 * Now fill the cluster with the "." and ".." entries. And write 818 * the cluster to disk. This way it is there for the parent 819 * directory to be pointing at if there were a crash. 820 */ 821 bn = cntobn(pmp, newcluster); 822 lbn = de_bn2kb(pmp, bn); 823 /* always succeeds */ 824 bp = getblk(pmp->pm_devvp, lbn, pmp->pm_bpcluster, 0, 0); 825 memset(bp->b_data, 0, pmp->pm_bpcluster); 826 memcpy(bp->b_data, &dosdirtemplate, sizeof dosdirtemplate); 827 denp = (struct direntry *)bp->b_data; 828 putushort(denp[0].deStartCluster, newcluster); 829 putushort(denp[0].deCDate, ndirent.de_CDate); 830 putushort(denp[0].deCTime, ndirent.de_CTime); 831 denp[0].deCHundredth = ndirent.de_CHun; 832 putushort(denp[0].deADate, ndirent.de_ADate); 833 putushort(denp[0].deMDate, ndirent.de_MDate); 834 putushort(denp[0].deMTime, ndirent.de_MTime); 835 pcl = pdep->de_StartCluster; 836 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 837 pcl = 0; 838 putushort(denp[1].deStartCluster, pcl); 839 putushort(denp[1].deCDate, ndirent.de_CDate); 840 putushort(denp[1].deCTime, ndirent.de_CTime); 841 denp[1].deCHundredth = ndirent.de_CHun; 842 putushort(denp[1].deADate, ndirent.de_ADate); 843 putushort(denp[1].deMDate, ndirent.de_MDate); 844 putushort(denp[1].deMTime, ndirent.de_MTime); 845 if (FAT32(pmp)) { 846 putushort(denp[0].deHighClust, newcluster >> 16); 847 putushort(denp[1].deHighClust, pdep->de_StartCluster >> 16); 848 } else { 849 putushort(denp[0].deHighClust, 0); 850 putushort(denp[1].deHighClust, 0); 851 } 852 853 if (async) 854 bdwrite(bp); 855 else if ((error = bwrite(bp)) != 0) 856 goto bad; 857 858 /* 859 * Now build up a directory entry pointing to the newly allocated 860 * cluster. This will be written to an empty slot in the parent 861 * directory. 862 */ 863 if ((error = msdosfs_uniqdosname(pdep, cnp, ndirent.de_Name)) != 0) 864 goto bad; 865 866 ndirent.de_Attributes = ATTR_DIRECTORY; 867 ndirent.de_StartCluster = newcluster; 868 ndirent.de_FileSize = 0; 869 ndirent.de_dev = pdep->de_dev; 870 ndirent.de_devvp = pdep->de_devvp; 871 if ((error = msdosfs_createde(&ndirent, pdep, &pdep->de_crap, &dep, 872 cnp)) != 0) 873 goto bad; 874 *ap->a_vpp = DETOV(dep); 875 return (0); 876 877 bad: 878 msdosfs_clusterfree(pmp, newcluster, NULL); 879 bad2: 880 return (error); 881 } 882 883 int 884 msdosfs_rmdir(void *v) 885 { 886 struct vop_rmdir_v2_args /* { 887 struct vnode *a_dvp; 888 struct vnode *a_vp; 889 struct componentname *a_cnp; 890 } */ *ap = v; 891 struct vnode *vp = ap->a_vp; 892 struct vnode *dvp = ap->a_dvp; 893 struct componentname *cnp = ap->a_cnp; 894 struct denode *ip, *dp; 895 int error; 896 897 ip = VTODE(vp); 898 dp = VTODE(dvp); 899 /* 900 * No rmdir "." please. 901 */ 902 if (dp == ip) { 903 vrele(vp); 904 return (EINVAL); 905 } 906 /* 907 * Verify the directory is empty (and valid). 908 * (Rmdir ".." won't be valid since 909 * ".." will contain a reference to 910 * the current directory and thus be 911 * non-empty.) 912 */ 913 error = 0; 914 if (!msdosfs_dosdirempty(ip) || ip->de_flag & DE_RENAME) { 915 error = ENOTEMPTY; 916 goto out; 917 } 918 /* 919 * Delete the entry from the directory. For dos filesystems this 920 * gets rid of the directory entry on disk, the in memory copy 921 * still exists but the de_refcnt is <= 0. This prevents it from 922 * being found by deget(). When the vput() on dep is done we give 923 * up access and eventually msdosfs_reclaim() will be called which 924 * will remove it from the denode cache. 925 */ 926 if ((error = msdosfs_removede(dp, ip, &dp->de_crap)) != 0) 927 goto out; 928 /* 929 * This is where we decrement the link count in the parent 930 * directory. Since dos filesystems don't do this we just purge 931 * the name cache and let go of the parent directory denode. 932 */ 933 cache_purge(dvp); 934 /* 935 * Truncate the directory that is being deleted. 936 */ 937 error = msdosfs_detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred); 938 cache_purge(vp); 939 out: 940 vput(vp); 941 return (error); 942 } 943 944 int 945 msdosfs_readdir(void *v) 946 { 947 struct vop_readdir_args /* { 948 struct vnode *a_vp; 949 struct uio *a_uio; 950 kauth_cred_t a_cred; 951 int *a_eofflag; 952 off_t **a_cookies; 953 int *a_ncookies; 954 } */ *ap = v; 955 int error = 0; 956 int diff; 957 long n; 958 int blsize; 959 long on; 960 long lost; 961 long count; 962 u_long cn; 963 ino_t fileno; 964 u_long dirsperblk; 965 long bias = 0; 966 daddr_t bn, lbn; 967 struct buf *bp; 968 struct denode *dep = VTODE(ap->a_vp); 969 struct msdosfsmount *pmp = dep->de_pmp; 970 struct direntry *dentp; 971 struct dirent *dirbuf; 972 struct uio *uio = ap->a_uio; 973 off_t *cookies = NULL; 974 int ncookies = 0, nc = 0; 975 off_t offset, uio_off; 976 int chksum = -1; 977 uint16_t namlen; 978 979 #ifdef MSDOSFS_DEBUG 980 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n", 981 ap->a_vp, uio, ap->a_cred, ap->a_eofflag); 982 #endif 983 984 /* 985 * msdosfs_readdir() won't operate properly on regular files since 986 * it does i/o only with the filesystem vnode, and hence can 987 * retrieve the wrong block from the buffer cache for a plain file. 988 * So, fail attempts to readdir() on a plain file. 989 */ 990 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) 991 return (ENOTDIR); 992 993 /* 994 * If the user buffer is smaller than the size of one dos directory 995 * entry or the file offset is not a multiple of the size of a 996 * directory entry, then we fail the read. 997 */ 998 count = uio->uio_resid & ~(sizeof(struct direntry) - 1); 999 offset = uio->uio_offset; 1000 if (count < sizeof(struct direntry) || 1001 (offset & (sizeof(struct direntry) - 1))) 1002 return (EINVAL); 1003 lost = uio->uio_resid - count; 1004 uio->uio_resid = count; 1005 uio_off = uio->uio_offset; 1006 1007 1008 /* Allocate a temporary dirent buffer. */ 1009 dirbuf = malloc(sizeof(struct dirent), M_MSDOSFSTMP, M_WAITOK | M_ZERO); 1010 1011 if (ap->a_ncookies) { 1012 nc = uio->uio_resid / _DIRENT_MINSIZE((struct dirent *)0); 1013 cookies = malloc(nc * sizeof (off_t), M_TEMP, M_WAITOK); 1014 *ap->a_cookies = cookies; 1015 } 1016 1017 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 1018 1019 /* 1020 * If they are reading from the root directory then, we simulate 1021 * the . and .. entries since these don't exist in the root 1022 * directory. We also set the offset bias to make up for having to 1023 * simulate these entries. By this I mean that at file offset 64 we 1024 * read the first entry in the root directory that lives on disk. 1025 */ 1026 if (dep->de_StartCluster == MSDOSFSROOT 1027 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) { 1028 #if 0 1029 printf("msdosfs_readdir(): going after . or .. in root dir, " 1030 "offset %" PRIu64 "\n", offset); 1031 #endif 1032 bias = 2 * sizeof(struct direntry); 1033 if (offset < bias) { 1034 for (n = (int)offset / sizeof(struct direntry); 1035 n < 2; n++) { 1036 if (FAT32(pmp)) 1037 dirbuf->d_fileno = cntobn(pmp, 1038 (ino_t)pmp->pm_rootdirblk) 1039 * dirsperblk; 1040 else 1041 dirbuf->d_fileno = 1; 1042 dirbuf->d_type = DT_DIR; 1043 switch (n) { 1044 case 0: 1045 dirbuf->d_namlen = 1; 1046 strlcpy(dirbuf->d_name, ".", 1047 sizeof(dirbuf->d_name)); 1048 break; 1049 case 1: 1050 dirbuf->d_namlen = 2; 1051 strlcpy(dirbuf->d_name, "..", 1052 sizeof(dirbuf->d_name)); 1053 break; 1054 } 1055 dirbuf->d_reclen = _DIRENT_SIZE(dirbuf); 1056 if (uio->uio_resid < dirbuf->d_reclen) 1057 goto out; 1058 error = uiomove(dirbuf, dirbuf->d_reclen, uio); 1059 if (error) 1060 goto out; 1061 offset += sizeof(struct direntry); 1062 uio_off = offset; 1063 if (cookies) { 1064 *cookies++ = offset; 1065 ncookies++; 1066 if (ncookies >= nc) 1067 goto out; 1068 } 1069 } 1070 } 1071 } 1072 1073 while (uio->uio_resid > 0) { 1074 lbn = de_cluster(pmp, offset - bias); 1075 on = (offset - bias) & pmp->pm_crbomask; 1076 n = MIN(pmp->pm_bpcluster - on, uio->uio_resid); 1077 diff = dep->de_FileSize - (offset - bias); 1078 if (diff <= 0) 1079 break; 1080 n = MIN(n, diff); 1081 if ((error = msdosfs_pcbmap(dep, lbn, &bn, &cn, &blsize)) != 0) 1082 break; 1083 error = bread(pmp->pm_devvp, de_bn2kb(pmp, bn), blsize, 1084 0, &bp); 1085 if (error) { 1086 goto bad; 1087 } 1088 n = MIN(n, blsize - bp->b_resid); 1089 1090 /* 1091 * Convert from dos directory entries to fs-independent 1092 * directory entries. 1093 */ 1094 for (dentp = (struct direntry *)((char *)bp->b_data + on); 1095 (char *)dentp < (char *)bp->b_data + on + n; 1096 dentp++, offset += sizeof(struct direntry)) { 1097 #if 0 1098 1099 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n", 1100 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes); 1101 #endif 1102 /* 1103 * If this is an unused entry, we can stop. 1104 */ 1105 if (dentp->deName[0] == SLOT_EMPTY) { 1106 brelse(bp, 0); 1107 goto out; 1108 } 1109 /* 1110 * Skip deleted entries. 1111 */ 1112 if (dentp->deName[0] == SLOT_DELETED) { 1113 chksum = -1; 1114 continue; 1115 } 1116 1117 /* 1118 * Handle Win95 long directory entries 1119 */ 1120 if (dentp->deAttributes == ATTR_WIN95) { 1121 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) 1122 continue; 1123 chksum = 1124 msdosfs_win2unixfn((struct winentry *)dentp, 1125 dirbuf, chksum, &namlen, 1126 pmp->pm_flags & MSDOSFSMNT_UTF8); 1127 if (chksum != -1) 1128 dirbuf->d_namlen = namlen; 1129 continue; 1130 } 1131 1132 /* 1133 * Skip volume labels 1134 */ 1135 if (dentp->deAttributes & ATTR_VOLUME) { 1136 chksum = -1; 1137 continue; 1138 } 1139 /* 1140 * This computation of d_fileno must match 1141 * the computation of va_fileid in 1142 * msdosfs_getattr. 1143 */ 1144 if (dentp->deAttributes & ATTR_DIRECTORY) { 1145 fileno = getushort(dentp->deStartCluster); 1146 if (FAT32(pmp)) 1147 fileno |= ((ino_t)getushort(dentp->deHighClust)) << 16; 1148 /* if this is the root directory */ 1149 if (fileno == MSDOSFSROOT) 1150 if (FAT32(pmp)) 1151 fileno = cntobn(pmp, 1152 (ino_t)pmp->pm_rootdirblk) 1153 * dirsperblk; 1154 else 1155 fileno = 1; 1156 else 1157 fileno = cntobn(pmp, fileno) * dirsperblk; 1158 dirbuf->d_fileno = fileno; 1159 dirbuf->d_type = DT_DIR; 1160 } else { 1161 dirbuf->d_fileno = 1162 offset / sizeof(struct direntry); 1163 dirbuf->d_type = DT_REG; 1164 } 1165 if (chksum != msdosfs_winChksum(dentp->deName)) { 1166 char deName[11]; 1167 1168 memcpy(deName, dentp->deName, 1169 sizeof dentp->deName); 1170 memcpy(deName + 8, dentp->deExtension, 1171 sizeof dentp->deExtension); 1172 assert(sizeof(deName) == sizeof(dentp->deName) + 1173 sizeof(dentp->deExtension)); 1174 dirbuf->d_namlen = 1175 msdosfs_dos2unixfn(deName, 1176 (u_char *)dirbuf->d_name, 1177 pmp->pm_flags & MSDOSFSMNT_SHORTNAME); 1178 } else 1179 dirbuf->d_name[dirbuf->d_namlen] = 0; 1180 namlen = dirbuf->d_namlen; 1181 chksum = -1; 1182 dirbuf->d_reclen = _DIRENT_SIZE(dirbuf); 1183 if (uio->uio_resid < dirbuf->d_reclen) { 1184 brelse(bp, 0); 1185 goto out; 1186 } 1187 error = uiomove(dirbuf, dirbuf->d_reclen, uio); 1188 if (error) { 1189 brelse(bp, 0); 1190 goto out; 1191 } 1192 uio_off = offset + sizeof(struct direntry); 1193 if (cookies) { 1194 *cookies++ = offset + sizeof(struct direntry); 1195 ncookies++; 1196 if (ncookies >= nc) { 1197 brelse(bp, 0); 1198 goto out; 1199 } 1200 } 1201 } 1202 brelse(bp, 0); 1203 } 1204 1205 out: 1206 uio->uio_offset = uio_off; 1207 uio->uio_resid += lost; 1208 if (dep->de_FileSize - (offset - bias) <= 0) 1209 *ap->a_eofflag = 1; 1210 else 1211 *ap->a_eofflag = 0; 1212 1213 if (ap->a_ncookies) { 1214 if (error) { 1215 free(*ap->a_cookies, M_TEMP); 1216 *ap->a_ncookies = 0; 1217 *ap->a_cookies = NULL; 1218 } else 1219 *ap->a_ncookies = ncookies; 1220 } 1221 1222 bad: 1223 free(dirbuf, M_MSDOSFSTMP); 1224 return (error); 1225 } 1226 1227 /* 1228 * vp - address of vnode file the file 1229 * bn - which cluster we are interested in mapping to a filesystem block number. 1230 * vpp - returns the vnode for the block special file holding the filesystem 1231 * containing the file of interest 1232 * bnp - address of where to return the filesystem relative block number 1233 */ 1234 int 1235 msdosfs_bmap(void *v) 1236 { 1237 struct vop_bmap_args /* { 1238 struct vnode *a_vp; 1239 daddr_t a_bn; 1240 struct vnode **a_vpp; 1241 daddr_t *a_bnp; 1242 int *a_runp; 1243 } */ *ap = v; 1244 struct denode *dep = VTODE(ap->a_vp); 1245 int run, maxrun; 1246 daddr_t runbn; 1247 int status; 1248 1249 if (ap->a_vpp != NULL) 1250 *ap->a_vpp = dep->de_devvp; 1251 if (ap->a_bnp == NULL) 1252 return (0); 1253 status = msdosfs_pcbmap(dep, ap->a_bn, ap->a_bnp, 0, 0); 1254 1255 /* 1256 * From FreeBSD: 1257 * A little kludgy, but we loop calling pcbmap until we 1258 * reach the end of the contiguous piece, or reach MAXPHYS. 1259 * Since it reduces disk I/Os, the "wasted" CPU is put to 1260 * good use (4 to 5 fold sequential read I/O improvement on USB 1261 * drives). 1262 */ 1263 if (ap->a_runp != NULL) { 1264 /* taken from ufs_bmap */ 1265 maxrun = ulmin(MAXPHYS / dep->de_pmp->pm_bpcluster - 1, 1266 dep->de_pmp->pm_maxcluster - ap->a_bn); 1267 for (run = 1; run <= maxrun; run++) { 1268 if (msdosfs_pcbmap(dep, ap->a_bn + run, &runbn, NULL, 1269 NULL) != 0 || runbn != 1270 *ap->a_bnp + de_cn2bn(dep->de_pmp, run)) 1271 break; 1272 } 1273 *ap->a_runp = run - 1; 1274 } 1275 1276 /* 1277 * We need to scale *ap->a_bnp by sector_size/DEV_BSIZE 1278 */ 1279 *ap->a_bnp = de_bn2kb(dep->de_pmp, *ap->a_bnp); 1280 return status; 1281 } 1282 1283 int 1284 msdosfs_strategy(void *v) 1285 { 1286 struct vop_strategy_args /* { 1287 struct vnode *a_vp; 1288 struct buf *a_bp; 1289 } */ *ap = v; 1290 struct vnode *vp = ap->a_vp; 1291 struct buf *bp = ap->a_bp; 1292 struct denode *dep = VTODE(bp->b_vp); 1293 int error = 0; 1294 1295 if (vp->v_type == VBLK || vp->v_type == VCHR) 1296 panic("msdosfs_strategy: spec"); 1297 /* 1298 * If we don't already know the filesystem relative block number 1299 * then get it using pcbmap(). If pcbmap() returns the block 1300 * number as -1 then we've got a hole in the file. DOS filesystems 1301 * don't allow files with holes, so we shouldn't ever see this. 1302 */ 1303 if (bp->b_blkno == bp->b_lblkno) { 1304 error = msdosfs_pcbmap(dep, de_bn2cn(dep->de_pmp, bp->b_lblkno), 1305 &bp->b_blkno, 0, 0); 1306 if (error) 1307 bp->b_blkno = -1; 1308 if (bp->b_blkno == -1) 1309 clrbuf(bp); 1310 else 1311 bp->b_blkno = de_bn2kb(dep->de_pmp, bp->b_blkno); 1312 } 1313 if (bp->b_blkno == -1) { 1314 biodone(bp); 1315 return (error); 1316 } 1317 1318 /* 1319 * Read/write the block from/to the disk that contains the desired 1320 * file block. 1321 */ 1322 1323 vp = dep->de_devvp; 1324 return (VOP_STRATEGY(vp, bp)); 1325 } 1326 1327 int 1328 msdosfs_print(void *v) 1329 { 1330 struct vop_print_args /* { 1331 struct vnode *vp; 1332 } */ *ap = v; 1333 struct denode *dep = VTODE(ap->a_vp); 1334 1335 printf( 1336 "tag VT_MSDOSFS, startcluster %ld, dircluster %ld, diroffset %ld ", 1337 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset); 1338 printf(" dev %llu, %llu ", (unsigned long long)major(dep->de_dev), 1339 (unsigned long long)minor(dep->de_dev)); 1340 printf("\n"); 1341 return (0); 1342 } 1343 1344 int 1345 msdosfs_advlock(void *v) 1346 { 1347 struct vop_advlock_args /* { 1348 struct vnode *a_vp; 1349 void *a_id; 1350 int a_op; 1351 struct flock *a_fl; 1352 int a_flags; 1353 } */ *ap = v; 1354 struct denode *dep = VTODE(ap->a_vp); 1355 1356 return lf_advlock(ap, &dep->de_lockf, dep->de_FileSize); 1357 } 1358 1359 int 1360 msdosfs_pathconf(void *v) 1361 { 1362 struct vop_pathconf_args /* { 1363 struct vnode *a_vp; 1364 int a_name; 1365 register_t *a_retval; 1366 } */ *ap = v; 1367 1368 switch (ap->a_name) { 1369 case _PC_LINK_MAX: 1370 *ap->a_retval = 1; 1371 return (0); 1372 case _PC_NAME_MAX: 1373 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_namemax; 1374 return (0); 1375 case _PC_PATH_MAX: 1376 *ap->a_retval = PATH_MAX; 1377 return (0); 1378 case _PC_CHOWN_RESTRICTED: 1379 *ap->a_retval = 1; 1380 return (0); 1381 case _PC_NO_TRUNC: 1382 *ap->a_retval = 1; 1383 return (0); 1384 case _PC_SYNC_IO: 1385 *ap->a_retval = 1; 1386 return (0); 1387 case _PC_FILESIZEBITS: 1388 *ap->a_retval = 32; 1389 return (0); 1390 default: 1391 return genfs_pathconf(ap); 1392 } 1393 /* NOTREACHED */ 1394 } 1395 1396 /* 1397 * Flush the blocks of a file to disk. 1398 * 1399 * This function is worthless for vnodes that represent directories. Maybe we 1400 * could just do a sync if they try an fsync on a directory file. 1401 */ 1402 int 1403 msdosfs_fsync(void *v) 1404 { 1405 struct vop_fsync_args /* { 1406 struct vnode *a_vp; 1407 kauth_cred_t a_cred; 1408 int a_flags; 1409 off_t offlo; 1410 off_t offhi; 1411 } */ *ap = v; 1412 struct vnode *vp = ap->a_vp; 1413 int wait; 1414 int error; 1415 1416 wait = (ap->a_flags & FSYNC_WAIT) != 0; 1417 error = vflushbuf(vp, ap->a_flags); 1418 if (error == 0 && (ap->a_flags & FSYNC_DATAONLY) == 0) 1419 error = msdosfs_update(vp, NULL, NULL, wait ? UPDATE_WAIT : 0); 1420 1421 if (error == 0 && ap->a_flags & FSYNC_CACHE) { 1422 struct denode *dep = VTODE(vp); 1423 struct vnode *devvp = dep->de_devvp; 1424 1425 int l = 0; 1426 error = VOP_IOCTL(devvp, DIOCCACHESYNC, &l, FWRITE, 1427 curlwp->l_cred); 1428 } 1429 1430 return (error); 1431 } 1432 1433 void 1434 msdosfs_detimes(struct denode *dep, const struct timespec *acc, 1435 const struct timespec *mod, const struct timespec *cre, int gmtoff) 1436 { 1437 struct timespec *ts = NULL, tsb; 1438 1439 KASSERT(dep->de_flag & (DE_UPDATE | DE_CREATE | DE_ACCESS)); 1440 /* XXX just call getnanotime early and use result if needed? */ 1441 dep->de_flag |= DE_MODIFIED; 1442 if (dep->de_flag & DE_UPDATE) { 1443 if (mod == NULL) { 1444 getnanotime(&tsb); 1445 mod = ts = &tsb; 1446 } 1447 msdosfs_unix2dostime(mod, gmtoff, &dep->de_MDate, 1448 &dep->de_MTime, NULL); 1449 dep->de_Attributes |= ATTR_ARCHIVE; 1450 } 1451 if ((dep->de_pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0) { 1452 if (dep->de_flag & DE_ACCESS) { 1453 if (acc == NULL) 1454 acc = ts == NULL ? 1455 (getnanotime(&tsb), ts = &tsb) : ts; 1456 msdosfs_unix2dostime(acc, gmtoff, &dep->de_ADate, 1457 NULL, NULL); 1458 } 1459 if (dep->de_flag & DE_CREATE) { 1460 if (cre == NULL) 1461 cre = ts == NULL ? 1462 (getnanotime(&tsb), ts = &tsb) : ts; 1463 msdosfs_unix2dostime(cre, gmtoff, &dep->de_CDate, 1464 &dep->de_CTime, &dep->de_CHun); 1465 } 1466 } 1467 1468 dep->de_flag &= ~(DE_UPDATE | DE_CREATE | DE_ACCESS); 1469 } 1470 1471 /* Global vfs data structures for msdosfs */ 1472 int (**msdosfs_vnodeop_p)(void *); 1473 const struct vnodeopv_entry_desc msdosfs_vnodeop_entries[] = { 1474 { &vop_default_desc, vn_default_error }, 1475 { &vop_parsepath_desc, genfs_parsepath }, /* parsepath */ 1476 { &vop_lookup_desc, msdosfs_lookup }, /* lookup */ 1477 { &vop_create_desc, msdosfs_create }, /* create */ 1478 { &vop_mknod_desc, genfs_eopnotsupp }, /* mknod */ 1479 { &vop_open_desc, genfs_nullop }, /* open */ 1480 { &vop_close_desc, msdosfs_close }, /* close */ 1481 { &vop_access_desc, msdosfs_access }, /* access */ 1482 { &vop_accessx_desc, genfs_accessx }, /* accessx */ 1483 { &vop_getattr_desc, msdosfs_getattr }, /* getattr */ 1484 { &vop_setattr_desc, msdosfs_setattr }, /* setattr */ 1485 { &vop_read_desc, msdosfs_read }, /* read */ 1486 { &vop_write_desc, msdosfs_write }, /* write */ 1487 { &vop_fallocate_desc, genfs_eopnotsupp }, /* fallocate */ 1488 { &vop_fdiscard_desc, genfs_eopnotsupp }, /* fdiscard */ 1489 { &vop_fcntl_desc, genfs_fcntl }, /* fcntl */ 1490 { &vop_ioctl_desc, genfs_enoioctl }, /* ioctl */ 1491 { &vop_poll_desc, genfs_poll }, /* poll */ 1492 { &vop_kqfilter_desc, genfs_kqfilter }, /* kqfilter */ 1493 { &vop_revoke_desc, genfs_revoke }, /* revoke */ 1494 { &vop_mmap_desc, genfs_mmap }, /* mmap */ 1495 { &vop_fsync_desc, msdosfs_fsync }, /* fsync */ 1496 { &vop_seek_desc, genfs_seek }, /* seek */ 1497 { &vop_remove_desc, msdosfs_remove }, /* remove */ 1498 { &vop_link_desc, genfs_eopnotsupp }, /* link */ 1499 { &vop_rename_desc, msdosfs_rename }, /* rename */ 1500 { &vop_mkdir_desc, msdosfs_mkdir }, /* mkdir */ 1501 { &vop_rmdir_desc, msdosfs_rmdir }, /* rmdir */ 1502 { &vop_symlink_desc, genfs_eopnotsupp }, /* symlink */ 1503 { &vop_readdir_desc, msdosfs_readdir }, /* readdir */ 1504 { &vop_readlink_desc, genfs_einval }, /* readlink */ 1505 { &vop_abortop_desc, genfs_abortop }, /* abortop */ 1506 { &vop_inactive_desc, msdosfs_inactive }, /* inactive */ 1507 { &vop_reclaim_desc, msdosfs_reclaim }, /* reclaim */ 1508 { &vop_lock_desc, genfs_lock }, /* lock */ 1509 { &vop_unlock_desc, genfs_unlock }, /* unlock */ 1510 { &vop_bmap_desc, msdosfs_bmap }, /* bmap */ 1511 { &vop_strategy_desc, msdosfs_strategy }, /* strategy */ 1512 { &vop_print_desc, msdosfs_print }, /* print */ 1513 { &vop_islocked_desc, genfs_islocked }, /* islocked */ 1514 { &vop_pathconf_desc, msdosfs_pathconf }, /* pathconf */ 1515 { &vop_advlock_desc, msdosfs_advlock }, /* advlock */ 1516 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 1517 { &vop_getpages_desc, genfs_getpages }, /* getpages */ 1518 { &vop_putpages_desc, genfs_putpages }, /* putpages */ 1519 { NULL, NULL } 1520 }; 1521 const struct vnodeopv_desc msdosfs_vnodeop_opv_desc = 1522 { &msdosfs_vnodeop_p, msdosfs_vnodeop_entries }; 1523
Indexes created Sun Oct 25 00:26:45 UTC 2026