1 /* $NetBSD: msdosfs_vnops.c,v 1.113 2024/09/11 00:27:54 perseant 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 1.113 2024/09/11 00:27:54 perseant 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_ctime); 297 } else { 298 vap->va_atime = vap->va_mtime; 299 vap->va_ctime = vap->va_mtime; 300 } 301 vap->va_flags = 0; 302 if ((dep->de_Attributes & ATTR_ARCHIVE) == 0) { 303 vap->va_flags |= SF_ARCHIVED; 304 vap->va_mode |= S_ARCH1; 305 } 306 vap->va_gen = 0; 307 vap->va_blocksize = pmp->pm_bpcluster; 308 vap->va_bytes = 309 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask; 310 vap->va_type = ap->a_vp->v_type; 311 return (0); 312 } 313 314 int 315 msdosfs_setattr(void *v) 316 { 317 struct vop_setattr_args /* { 318 struct vnode *a_vp; 319 struct vattr *a_vap; 320 kauth_cred_t a_cred; 321 } */ *ap = v; 322 int error = 0, de_changed = 0; 323 struct denode *dep = VTODE(ap->a_vp); 324 struct msdosfsmount *pmp = dep->de_pmp; 325 struct vnode *vp = ap->a_vp; 326 struct vattr *vap = ap->a_vap; 327 kauth_cred_t cred = ap->a_cred; 328 329 #ifdef MSDOSFS_DEBUG 330 printf("msdosfs_setattr(): vp %p, vap %p, cred %p\n", 331 ap->a_vp, vap, cred); 332 #endif 333 /* 334 * Note we silently ignore uid or gid changes. 335 */ 336 if ((vap->va_type != VNON) || (vap->va_nlink != (nlink_t)VNOVAL) || 337 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 338 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 339 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL) || 340 (vap->va_uid != VNOVAL && vap->va_uid != pmp->pm_uid) || 341 (vap->va_gid != VNOVAL && vap->va_gid != pmp->pm_gid)) { 342 #ifdef MSDOSFS_DEBUG 343 printf("msdosfs_setattr(): returning EINVAL\n"); 344 printf(" va_type %d, va_nlink %x, va_fsid %"PRIx64", va_fileid %llx\n", 345 vap->va_type, vap->va_nlink, vap->va_fsid, 346 (unsigned long long)vap->va_fileid); 347 printf(" va_blocksize %lx, va_rdev %"PRIx64", va_bytes %"PRIx64", va_gen %lx\n", 348 vap->va_blocksize, vap->va_rdev, vap->va_bytes, vap->va_gen); 349 #endif 350 return (EINVAL); 351 } 352 /* 353 * Silently ignore attributes modifications on directories. 354 */ 355 if (ap->a_vp->v_type == VDIR) 356 return 0; 357 358 if (vap->va_size != VNOVAL) { 359 if (vp->v_mount->mnt_flag & MNT_RDONLY) { 360 error = EROFS; 361 goto bad; 362 } 363 error = msdosfs_detrunc(dep, (u_long)vap->va_size, 0, cred); 364 if (error) 365 goto bad; 366 de_changed = 1; 367 } 368 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 369 if (vp->v_mount->mnt_flag & MNT_RDONLY) { 370 error = EROFS; 371 goto bad; 372 } 373 error = kauth_authorize_vnode(cred, KAUTH_VNODE_WRITE_TIMES, 374 ap->a_vp, NULL, genfs_can_chtimes(ap->a_vp, cred, 375 pmp->pm_uid, vap->va_vaflags)); 376 if (error) 377 goto bad; 378 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 && 379 vap->va_atime.tv_sec != VNOVAL) 380 msdosfs_unix2dostime(&vap->va_atime, pmp->pm_gmtoff, 381 &dep->de_ADate, NULL, NULL); 382 if (vap->va_mtime.tv_sec != VNOVAL) 383 msdosfs_unix2dostime(&vap->va_mtime, pmp->pm_gmtoff, 384 &dep->de_MDate, &dep->de_MTime, NULL); 385 dep->de_Attributes |= ATTR_ARCHIVE; 386 dep->de_flag |= DE_MODIFIED; 387 de_changed = 1; 388 } 389 /* 390 * DOS files only have the ability to have their writability 391 * attribute set, so we use the owner write bit to set the readonly 392 * attribute. 393 */ 394 if (vap->va_mode != (mode_t)VNOVAL) { 395 if (vp->v_mount->mnt_flag & MNT_RDONLY) { 396 error = EROFS; 397 goto bad; 398 } 399 error = kauth_authorize_vnode(cred, KAUTH_VNODE_WRITE_FLAGS, vp, 400 NULL, genfs_can_chflags(vp, cred, pmp->pm_uid, false)); 401 if (error) 402 goto bad; 403 /* We ignore the read and execute bits. */ 404 if (vap->va_mode & S_IWUSR) 405 dep->de_Attributes &= ~ATTR_READONLY; 406 else 407 dep->de_Attributes |= ATTR_READONLY; 408 dep->de_flag |= DE_MODIFIED; 409 de_changed = 1; 410 } 411 /* 412 * Allow the `archived' bit to be toggled. 413 */ 414 if (vap->va_flags != VNOVAL) { 415 if (vp->v_mount->mnt_flag & MNT_RDONLY) { 416 error = EROFS; 417 goto bad; 418 } 419 error = kauth_authorize_vnode(cred, KAUTH_VNODE_WRITE_FLAGS, vp, 420 NULL, genfs_can_chflags(vp, cred, pmp->pm_uid, false)); 421 if (error) 422 goto bad; 423 if (vap->va_flags & SF_ARCHIVED) 424 dep->de_Attributes &= ~ATTR_ARCHIVE; 425 else 426 dep->de_Attributes |= ATTR_ARCHIVE; 427 dep->de_flag |= DE_MODIFIED; 428 de_changed = 1; 429 } 430 431 if (de_changed) { 432 error = msdosfs_deupdat(dep, 1); 433 if (error) 434 goto bad; 435 } 436 437 bad: 438 return error; 439 } 440 441 int 442 msdosfs_read(void *v) 443 { 444 struct vop_read_args /* { 445 struct vnode *a_vp; 446 struct uio *a_uio; 447 int a_ioflag; 448 kauth_cred_t a_cred; 449 } */ *ap = v; 450 int error = 0; 451 int64_t diff; 452 int blsize; 453 long n; 454 long on; 455 daddr_t lbn; 456 vsize_t bytelen; 457 struct buf *bp; 458 struct vnode *vp = ap->a_vp; 459 struct denode *dep = VTODE(vp); 460 struct msdosfsmount *pmp = dep->de_pmp; 461 struct uio *uio = ap->a_uio; 462 463 /* 464 * If they didn't ask for any data, then we are done. 465 */ 466 467 if (uio->uio_resid == 0) 468 return (0); 469 if (uio->uio_offset < 0) 470 return (EINVAL); 471 if (uio->uio_offset >= dep->de_FileSize) 472 return (0); 473 474 if (vp->v_type == VREG) { 475 const int advice = IO_ADV_DECODE(ap->a_ioflag); 476 477 while (uio->uio_resid > 0) { 478 bytelen = MIN(dep->de_FileSize - uio->uio_offset, 479 uio->uio_resid); 480 481 if (bytelen == 0) 482 break; 483 error = ubc_uiomove(&vp->v_uobj, uio, bytelen, advice, 484 UBC_READ | UBC_PARTIALOK | UBC_VNODE_FLAGS(vp)); 485 if (error) 486 break; 487 } 488 dep->de_flag |= DE_ACCESS; 489 goto out; 490 } 491 492 /* this loop is only for directories now */ 493 do { 494 lbn = de_cluster(pmp, uio->uio_offset); 495 on = uio->uio_offset & pmp->pm_crbomask; 496 n = MIN(pmp->pm_bpcluster - on, uio->uio_resid); 497 if (uio->uio_offset >= dep->de_FileSize) { 498 return (0); 499 } 500 /* file size (and hence diff) may be up to 4GB */ 501 diff = dep->de_FileSize - uio->uio_offset; 502 if (diff < n) 503 n = (long) diff; 504 505 /* convert cluster # to sector # */ 506 error = msdosfs_pcbmap(dep, lbn, &lbn, 0, &blsize); 507 if (error) 508 goto bad; 509 510 /* 511 * If we are operating on a directory file then be sure to 512 * do i/o with the vnode for the filesystem instead of the 513 * vnode for the directory. 514 */ 515 error = bread(pmp->pm_devvp, de_bn2kb(pmp, lbn), blsize, 516 0, &bp); 517 if (error) { 518 goto bad; 519 } 520 n = MIN(n, pmp->pm_bpcluster - bp->b_resid); 521 error = uiomove((char *)bp->b_data + on, (int) n, uio); 522 brelse(bp, 0); 523 } while (error == 0 && uio->uio_resid > 0 && n != 0); 524 525 out: 526 if ((ap->a_ioflag & IO_SYNC) == IO_SYNC) { 527 int uerror; 528 529 uerror = msdosfs_deupdat(dep, 1); 530 if (error == 0) 531 error = uerror; 532 } 533 bad: 534 return (error); 535 } 536 537 /* 538 * Write data to a file or directory. 539 */ 540 int 541 msdosfs_write(void *v) 542 { 543 struct vop_write_args /* { 544 struct vnode *a_vp; 545 struct uio *a_uio; 546 int a_ioflag; 547 kauth_cred_t a_cred; 548 } */ *ap = v; 549 int resid; 550 int error = 0; 551 int ioflag = ap->a_ioflag; 552 u_long osize; 553 u_long count; 554 vsize_t bytelen; 555 off_t oldoff; 556 size_t rem; 557 struct uio *uio = ap->a_uio; 558 struct vnode *vp = ap->a_vp; 559 struct denode *dep = VTODE(vp); 560 struct msdosfsmount *pmp = dep->de_pmp; 561 kauth_cred_t cred = ap->a_cred; 562 bool async; 563 564 #ifdef MSDOSFS_DEBUG 565 printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n", 566 vp, uio, ioflag, cred); 567 printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n", 568 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster); 569 #endif 570 571 switch (vp->v_type) { 572 case VREG: 573 if (ioflag & IO_APPEND) 574 uio->uio_offset = dep->de_FileSize; 575 break; 576 case VDIR: 577 return EISDIR; 578 default: 579 panic("msdosfs_write(): bad file type"); 580 } 581 582 if (uio->uio_offset < 0) 583 return (EINVAL); 584 585 if (uio->uio_resid == 0) 586 return (0); 587 588 /* Don't bother to try to write files larger than the fs limit */ 589 if (uio->uio_offset + uio->uio_resid > MSDOSFS_FILESIZE_MAX) 590 return (EFBIG); 591 592 /* 593 * If the offset we are starting the write at is beyond the end of 594 * the file, then they've done a seek. Unix filesystems allow 595 * files with holes in them, DOS doesn't so we must fill the hole 596 * with zeroed blocks. 597 */ 598 if (uio->uio_offset > dep->de_FileSize) { 599 if ((error = msdosfs_deextend(dep, uio->uio_offset, 600 cred)) != 0) { 601 return (error); 602 } 603 } 604 605 /* 606 * Remember some values in case the write fails. 607 */ 608 async = vp->v_mount->mnt_flag & MNT_ASYNC; 609 resid = uio->uio_resid; 610 osize = dep->de_FileSize; 611 612 /* 613 * If we write beyond the end of the file, extend it to its ultimate 614 * size ahead of the time to hopefully get a contiguous area. 615 */ 616 if (uio->uio_offset + resid > osize) { 617 count = de_clcount(pmp, uio->uio_offset + resid) - 618 de_clcount(pmp, osize); 619 if ((error = msdosfs_extendfile(dep, count, NULL, NULL, 0))) 620 goto errexit; 621 622 dep->de_FileSize = uio->uio_offset + resid; 623 /* hint uvm to not read in extended part */ 624 uvm_vnp_setwritesize(vp, dep->de_FileSize); 625 /* zero out the remainder of the last page */ 626 rem = round_page(dep->de_FileSize) - dep->de_FileSize; 627 if (rem > 0) 628 ubc_zerorange(&vp->v_uobj, (off_t)dep->de_FileSize, 629 rem, UBC_VNODE_FLAGS(vp)); 630 } 631 632 do { 633 oldoff = uio->uio_offset; 634 bytelen = uio->uio_resid; 635 636 error = ubc_uiomove(&vp->v_uobj, uio, bytelen, 637 IO_ADV_DECODE(ioflag), UBC_WRITE | UBC_VNODE_FLAGS(vp)); 638 if (error) 639 break; 640 641 /* 642 * flush what we just wrote if necessary. 643 * XXXUBC simplistic async flushing. 644 */ 645 646 if (!async && oldoff >> 16 != uio->uio_offset >> 16) { 647 rw_enter(vp->v_uobj.vmobjlock, RW_WRITER); 648 error = VOP_PUTPAGES(vp, (oldoff >> 16) << 16, 649 (uio->uio_offset >> 16) << 16, 650 PGO_CLEANIT | PGO_LAZY); 651 } 652 } while (error == 0 && uio->uio_resid > 0); 653 654 /* set final size */ 655 uvm_vnp_setsize(vp, dep->de_FileSize); 656 if (error == 0 && ioflag & IO_SYNC) { 657 rw_enter(vp->v_uobj.vmobjlock, RW_WRITER); 658 error = VOP_PUTPAGES(vp, trunc_page(oldoff), 659 round_page(oldoff + bytelen), PGO_CLEANIT | PGO_SYNCIO); 660 } 661 dep->de_flag |= DE_UPDATE; 662 663 /* 664 * If the write failed and they want us to, truncate the file back 665 * to the size it was before the write was attempted. 666 */ 667 errexit: 668 if (error) { 669 msdosfs_detrunc(dep, osize, ioflag & IO_SYNC, NOCRED); 670 uio->uio_offset -= resid - uio->uio_resid; 671 uio->uio_resid = resid; 672 } else if ((ioflag & IO_SYNC) == IO_SYNC) 673 error = msdosfs_deupdat(dep, 1); 674 KASSERT(vp->v_size == dep->de_FileSize); 675 return (error); 676 } 677 678 int 679 msdosfs_update(struct vnode *vp, const struct timespec *acc, 680 const struct timespec *mod, int flags) 681 { 682 struct buf *bp; 683 struct direntry *dirp; 684 struct denode *dep; 685 int error; 686 687 if (vp->v_mount->mnt_flag & MNT_RDONLY) 688 return (0); 689 dep = VTODE(vp); 690 DETIMES(dep, acc, mod, NULL, dep->de_pmp->pm_gmtoff); 691 if ((dep->de_flag & DE_MODIFIED) == 0) 692 return (0); 693 dep->de_flag &= ~DE_MODIFIED; 694 if (dep->de_Attributes & ATTR_DIRECTORY) 695 return (0); 696 if (dep->de_refcnt <= 0) 697 return (0); 698 error = msdosfs_readde(dep, &bp, &dirp); 699 if (error) 700 return (error); 701 DE_EXTERNALIZE(dirp, dep); 702 if (flags & (UPDATE_WAIT|UPDATE_DIROP)) 703 return (bwrite(bp)); 704 else { 705 bdwrite(bp); 706 return (0); 707 } 708 } 709 710 int 711 msdosfs_remove(void *v) 712 { 713 struct vop_remove_v3_args /* { 714 struct vnode *a_dvp; 715 struct vnode *a_vp; 716 struct componentname *a_cnp; 717 nlink_t ctx_vp_new_nlink; 718 } */ *ap = v; 719 struct denode *dep = VTODE(ap->a_vp); 720 struct denode *ddep = VTODE(ap->a_dvp); 721 int error; 722 723 if (ap->a_vp->v_type == VDIR) 724 error = EPERM; 725 else 726 error = msdosfs_removede(ddep, dep, &ddep->de_crap); 727 #ifdef MSDOSFS_DEBUG 728 printf("msdosfs_remove(), dep %p, usecount %d\n", 729 dep, vrefcnt(ap->a_vp)); 730 #endif 731 if (ddep == dep) 732 vrele(ap->a_vp); 733 else 734 vput(ap->a_vp); /* causes msdosfs_inactive() to be called 735 * via vrele() */ 736 737 return (error); 738 } 739 740 static const struct { 741 struct direntry dot; 742 struct direntry dotdot; 743 } dosdirtemplate = { 744 { ". ", " ", /* the . entry */ 745 ATTR_DIRECTORY, /* file attribute */ 746 0, /* reserved */ 747 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 748 { 0, 0 }, /* access date */ 749 { 0, 0 }, /* high bits of start cluster */ 750 { 210, 4 }, { 210, 4 }, /* modify time & date */ 751 { 0, 0 }, /* startcluster */ 752 { 0, 0, 0, 0 } /* filesize */ 753 }, 754 { ".. ", " ", /* the .. entry */ 755 ATTR_DIRECTORY, /* file attribute */ 756 0, /* reserved */ 757 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 758 { 0, 0 }, /* access date */ 759 { 0, 0 }, /* high bits of start cluster */ 760 { 210, 4 }, { 210, 4 }, /* modify time & date */ 761 { 0, 0 }, /* startcluster */ 762 { 0, 0, 0, 0 } /* filesize */ 763 } 764 }; 765 766 int 767 msdosfs_mkdir(void *v) 768 { 769 struct vop_mkdir_v3_args /* { 770 struct vnode *a_dvp; 771 struvt vnode **a_vpp; 772 struvt componentname *a_cnp; 773 struct vattr *a_vap; 774 } */ *ap = v; 775 struct componentname *cnp = ap->a_cnp; 776 struct denode ndirent; 777 struct denode *dep; 778 struct denode *pdep = VTODE(ap->a_dvp); 779 int error; 780 int bn; 781 u_long newcluster, pcl; 782 daddr_t lbn; 783 struct direntry *denp; 784 struct msdosfsmount *pmp = pdep->de_pmp; 785 struct buf *bp; 786 int async = pdep->de_pmp->pm_mountp->mnt_flag & MNT_ASYNC; 787 788 /* 789 * If this is the root directory and there is no space left we 790 * can't do anything. This is because the root directory can not 791 * change size. 792 */ 793 if (pdep->de_StartCluster == MSDOSFSROOT 794 && pdep->de_crap.mlr_fndoffset >= pdep->de_FileSize) { 795 error = ENOSPC; 796 goto bad2; 797 } 798 799 /* 800 * Allocate a cluster to hold the about to be created directory. 801 */ 802 error = msdosfs_clusteralloc(pmp, 0, 1, &newcluster, NULL); 803 if (error) 804 goto bad2; 805 806 memset(&ndirent, 0, sizeof(ndirent)); 807 ndirent.de_pmp = pmp; 808 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 809 DETIMES(&ndirent, NULL, NULL, NULL, pmp->pm_gmtoff); 810 811 /* 812 * Now fill the cluster with the "." and ".." entries. And write 813 * the cluster to disk. This way it is there for the parent 814 * directory to be pointing at if there were a crash. 815 */ 816 bn = cntobn(pmp, newcluster); 817 lbn = de_bn2kb(pmp, bn); 818 /* always succeeds */ 819 bp = getblk(pmp->pm_devvp, lbn, pmp->pm_bpcluster, 0, 0); 820 memset(bp->b_data, 0, pmp->pm_bpcluster); 821 memcpy(bp->b_data, &dosdirtemplate, sizeof dosdirtemplate); 822 denp = (struct direntry *)bp->b_data; 823 putushort(denp[0].deStartCluster, newcluster); 824 putushort(denp[0].deCDate, ndirent.de_CDate); 825 putushort(denp[0].deCTime, ndirent.de_CTime); 826 denp[0].deCHundredth = ndirent.de_CHun; 827 putushort(denp[0].deADate, ndirent.de_ADate); 828 putushort(denp[0].deMDate, ndirent.de_MDate); 829 putushort(denp[0].deMTime, ndirent.de_MTime); 830 pcl = pdep->de_StartCluster; 831 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 832 pcl = 0; 833 putushort(denp[1].deStartCluster, pcl); 834 putushort(denp[1].deCDate, ndirent.de_CDate); 835 putushort(denp[1].deCTime, ndirent.de_CTime); 836 denp[1].deCHundredth = ndirent.de_CHun; 837 putushort(denp[1].deADate, ndirent.de_ADate); 838 putushort(denp[1].deMDate, ndirent.de_MDate); 839 putushort(denp[1].deMTime, ndirent.de_MTime); 840 if (FAT32(pmp)) { 841 putushort(denp[0].deHighClust, newcluster >> 16); 842 putushort(denp[1].deHighClust, pdep->de_StartCluster >> 16); 843 } else { 844 putushort(denp[0].deHighClust, 0); 845 putushort(denp[1].deHighClust, 0); 846 } 847 848 if (async) 849 bdwrite(bp); 850 else if ((error = bwrite(bp)) != 0) 851 goto bad; 852 853 /* 854 * Now build up a directory entry pointing to the newly allocated 855 * cluster. This will be written to an empty slot in the parent 856 * directory. 857 */ 858 if ((error = msdosfs_uniqdosname(pdep, cnp, ndirent.de_Name)) != 0) 859 goto bad; 860 861 ndirent.de_Attributes = ATTR_DIRECTORY; 862 ndirent.de_StartCluster = newcluster; 863 ndirent.de_FileSize = 0; 864 ndirent.de_dev = pdep->de_dev; 865 ndirent.de_devvp = pdep->de_devvp; 866 if ((error = msdosfs_createde(&ndirent, pdep, &pdep->de_crap, &dep, 867 cnp)) != 0) 868 goto bad; 869 *ap->a_vpp = DETOV(dep); 870 return (0); 871 872 bad: 873 msdosfs_clusterfree(pmp, newcluster, NULL); 874 bad2: 875 return (error); 876 } 877 878 int 879 msdosfs_rmdir(void *v) 880 { 881 struct vop_rmdir_v2_args /* { 882 struct vnode *a_dvp; 883 struct vnode *a_vp; 884 struct componentname *a_cnp; 885 } */ *ap = v; 886 struct vnode *vp = ap->a_vp; 887 struct vnode *dvp = ap->a_dvp; 888 struct componentname *cnp = ap->a_cnp; 889 struct denode *ip, *dp; 890 int error; 891 892 ip = VTODE(vp); 893 dp = VTODE(dvp); 894 /* 895 * No rmdir "." please. 896 */ 897 if (dp == ip) { 898 vrele(vp); 899 return (EINVAL); 900 } 901 /* 902 * Verify the directory is empty (and valid). 903 * (Rmdir ".." won't be valid since 904 * ".." will contain a reference to 905 * the current directory and thus be 906 * non-empty.) 907 */ 908 error = 0; 909 if (!msdosfs_dosdirempty(ip) || ip->de_flag & DE_RENAME) { 910 error = ENOTEMPTY; 911 goto out; 912 } 913 /* 914 * Delete the entry from the directory. For dos filesystems this 915 * gets rid of the directory entry on disk, the in memory copy 916 * still exists but the de_refcnt is <= 0. This prevents it from 917 * being found by deget(). When the vput() on dep is done we give 918 * up access and eventually msdosfs_reclaim() will be called which 919 * will remove it from the denode cache. 920 */ 921 if ((error = msdosfs_removede(dp, ip, &dp->de_crap)) != 0) 922 goto out; 923 /* 924 * This is where we decrement the link count in the parent 925 * directory. Since dos filesystems don't do this we just purge 926 * the name cache and let go of the parent directory denode. 927 */ 928 cache_purge(dvp); 929 /* 930 * Truncate the directory that is being deleted. 931 */ 932 error = msdosfs_detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred); 933 cache_purge(vp); 934 out: 935 vput(vp); 936 return (error); 937 } 938 939 int 940 msdosfs_readdir(void *v) 941 { 942 struct vop_readdir_args /* { 943 struct vnode *a_vp; 944 struct uio *a_uio; 945 kauth_cred_t a_cred; 946 int *a_eofflag; 947 off_t **a_cookies; 948 int *a_ncookies; 949 } */ *ap = v; 950 int error = 0; 951 int diff; 952 long n; 953 int blsize; 954 long on; 955 long lost; 956 long count; 957 u_long cn; 958 ino_t fileno; 959 u_long dirsperblk; 960 long bias = 0; 961 daddr_t bn, lbn; 962 struct buf *bp; 963 struct denode *dep = VTODE(ap->a_vp); 964 struct msdosfsmount *pmp = dep->de_pmp; 965 struct direntry *dentp; 966 struct dirent *dirbuf; 967 struct uio *uio = ap->a_uio; 968 off_t *cookies = NULL; 969 int ncookies = 0, nc = 0; 970 off_t offset, uio_off; 971 int chksum = -1; 972 uint16_t namlen; 973 974 #ifdef MSDOSFS_DEBUG 975 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n", 976 ap->a_vp, uio, ap->a_cred, ap->a_eofflag); 977 #endif 978 979 /* 980 * msdosfs_readdir() won't operate properly on regular files since 981 * it does i/o only with the filesystem vnode, and hence can 982 * retrieve the wrong block from the buffer cache for a plain file. 983 * So, fail attempts to readdir() on a plain file. 984 */ 985 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) 986 return (ENOTDIR); 987 988 /* 989 * If the user buffer is smaller than the size of one dos directory 990 * entry or the file offset is not a multiple of the size of a 991 * directory entry, then we fail the read. 992 */ 993 count = uio->uio_resid & ~(sizeof(struct direntry) - 1); 994 offset = uio->uio_offset; 995 if (count < sizeof(struct direntry) || 996 (offset & (sizeof(struct direntry) - 1))) 997 return (EINVAL); 998 lost = uio->uio_resid - count; 999 uio->uio_resid = count; 1000 uio_off = uio->uio_offset; 1001 1002 1003 /* Allocate a temporary dirent buffer. */ 1004 dirbuf = malloc(sizeof(struct dirent), M_MSDOSFSTMP, M_WAITOK | M_ZERO); 1005 1006 if (ap->a_ncookies) { 1007 nc = uio->uio_resid / _DIRENT_MINSIZE((struct dirent *)0); 1008 cookies = malloc(nc * sizeof (off_t), M_TEMP, M_WAITOK); 1009 *ap->a_cookies = cookies; 1010 } 1011 1012 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 1013 1014 /* 1015 * If they are reading from the root directory then, we simulate 1016 * the . and .. entries since these don't exist in the root 1017 * directory. We also set the offset bias to make up for having to 1018 * simulate these entries. By this I mean that at file offset 64 we 1019 * read the first entry in the root directory that lives on disk. 1020 */ 1021 if (dep->de_StartCluster == MSDOSFSROOT 1022 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) { 1023 #if 0 1024 printf("msdosfs_readdir(): going after . or .. in root dir, " 1025 "offset %" PRIu64 "\n", offset); 1026 #endif 1027 bias = 2 * sizeof(struct direntry); 1028 if (offset < bias) { 1029 for (n = (int)offset / sizeof(struct direntry); 1030 n < 2; n++) { 1031 if (FAT32(pmp)) 1032 dirbuf->d_fileno = cntobn(pmp, 1033 (ino_t)pmp->pm_rootdirblk) 1034 * dirsperblk; 1035 else 1036 dirbuf->d_fileno = 1; 1037 dirbuf->d_type = DT_DIR; 1038 switch (n) { 1039 case 0: 1040 dirbuf->d_namlen = 1; 1041 strlcpy(dirbuf->d_name, ".", 1042 sizeof(dirbuf->d_name)); 1043 break; 1044 case 1: 1045 dirbuf->d_namlen = 2; 1046 strlcpy(dirbuf->d_name, "..", 1047 sizeof(dirbuf->d_name)); 1048 break; 1049 } 1050 dirbuf->d_reclen = _DIRENT_SIZE(dirbuf); 1051 if (uio->uio_resid < dirbuf->d_reclen) 1052 goto out; 1053 error = uiomove(dirbuf, dirbuf->d_reclen, uio); 1054 if (error) 1055 goto out; 1056 offset += sizeof(struct direntry); 1057 uio_off = offset; 1058 if (cookies) { 1059 *cookies++ = offset; 1060 ncookies++; 1061 if (ncookies >= nc) 1062 goto out; 1063 } 1064 } 1065 } 1066 } 1067 1068 while (uio->uio_resid > 0) { 1069 lbn = de_cluster(pmp, offset - bias); 1070 on = (offset - bias) & pmp->pm_crbomask; 1071 n = MIN(pmp->pm_bpcluster - on, uio->uio_resid); 1072 diff = dep->de_FileSize - (offset - bias); 1073 if (diff <= 0) 1074 break; 1075 n = MIN(n, diff); 1076 if ((error = msdosfs_pcbmap(dep, lbn, &bn, &cn, &blsize)) != 0) 1077 break; 1078 error = bread(pmp->pm_devvp, de_bn2kb(pmp, bn), blsize, 1079 0, &bp); 1080 if (error) { 1081 goto bad; 1082 } 1083 n = MIN(n, blsize - bp->b_resid); 1084 1085 /* 1086 * Convert from dos directory entries to fs-independent 1087 * directory entries. 1088 */ 1089 for (dentp = (struct direntry *)((char *)bp->b_data + on); 1090 (char *)dentp < (char *)bp->b_data + on + n; 1091 dentp++, offset += sizeof(struct direntry)) { 1092 #if 0 1093 1094 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n", 1095 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes); 1096 #endif 1097 /* 1098 * If this is an unused entry, we can stop. 1099 */ 1100 if (dentp->deName[0] == SLOT_EMPTY) { 1101 brelse(bp, 0); 1102 goto out; 1103 } 1104 /* 1105 * Skip deleted entries. 1106 */ 1107 if (dentp->deName[0] == SLOT_DELETED) { 1108 chksum = -1; 1109 continue; 1110 } 1111 1112 /* 1113 * Handle Win95 long directory entries 1114 */ 1115 if (dentp->deAttributes == ATTR_WIN95) { 1116 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) 1117 continue; 1118 chksum = 1119 msdosfs_win2unixfn((struct winentry *)dentp, 1120 dirbuf, chksum, &namlen, 1121 pmp->pm_flags & MSDOSFSMNT_UTF8); 1122 if (chksum != -1) 1123 dirbuf->d_namlen = namlen; 1124 continue; 1125 } 1126 1127 /* 1128 * Skip volume labels 1129 */ 1130 if (dentp->deAttributes & ATTR_VOLUME) { 1131 chksum = -1; 1132 continue; 1133 } 1134 /* 1135 * This computation of d_fileno must match 1136 * the computation of va_fileid in 1137 * msdosfs_getattr. 1138 */ 1139 if (dentp->deAttributes & ATTR_DIRECTORY) { 1140 fileno = getushort(dentp->deStartCluster); 1141 if (FAT32(pmp)) 1142 fileno |= ((ino_t)getushort(dentp->deHighClust)) << 16; 1143 /* if this is the root directory */ 1144 if (fileno == MSDOSFSROOT) 1145 if (FAT32(pmp)) 1146 fileno = cntobn(pmp, 1147 (ino_t)pmp->pm_rootdirblk) 1148 * dirsperblk; 1149 else 1150 fileno = 1; 1151 else 1152 fileno = cntobn(pmp, fileno) * dirsperblk; 1153 dirbuf->d_fileno = fileno; 1154 dirbuf->d_type = DT_DIR; 1155 } else { 1156 dirbuf->d_fileno = 1157 offset / sizeof(struct direntry); 1158 dirbuf->d_type = DT_REG; 1159 } 1160 if (chksum != msdosfs_winChksum(dentp->deName)) { 1161 char deName[11]; 1162 1163 memcpy(deName, dentp->deName, 1164 sizeof dentp->deName); 1165 memcpy(deName + 8, dentp->deExtension, 1166 sizeof dentp->deExtension); 1167 assert(sizeof(deName) == sizeof(dentp->deName) + 1168 sizeof(dentp->deExtension)); 1169 dirbuf->d_namlen = 1170 msdosfs_dos2unixfn(deName, 1171 (u_char *)dirbuf->d_name, 1172 pmp->pm_flags & MSDOSFSMNT_SHORTNAME); 1173 } else 1174 dirbuf->d_name[dirbuf->d_namlen] = 0; 1175 namlen = dirbuf->d_namlen; 1176 chksum = -1; 1177 dirbuf->d_reclen = _DIRENT_SIZE(dirbuf); 1178 if (uio->uio_resid < dirbuf->d_reclen) { 1179 brelse(bp, 0); 1180 goto out; 1181 } 1182 error = uiomove(dirbuf, dirbuf->d_reclen, uio); 1183 if (error) { 1184 brelse(bp, 0); 1185 goto out; 1186 } 1187 uio_off = offset + sizeof(struct direntry); 1188 if (cookies) { 1189 *cookies++ = offset + sizeof(struct direntry); 1190 ncookies++; 1191 if (ncookies >= nc) { 1192 brelse(bp, 0); 1193 goto out; 1194 } 1195 } 1196 } 1197 brelse(bp, 0); 1198 } 1199 1200 out: 1201 uio->uio_offset = uio_off; 1202 uio->uio_resid += lost; 1203 if (dep->de_FileSize - (offset - bias) <= 0) 1204 *ap->a_eofflag = 1; 1205 else 1206 *ap->a_eofflag = 0; 1207 1208 if (ap->a_ncookies) { 1209 if (error) { 1210 free(*ap->a_cookies, M_TEMP); 1211 *ap->a_ncookies = 0; 1212 *ap->a_cookies = NULL; 1213 } else 1214 *ap->a_ncookies = ncookies; 1215 } 1216 1217 bad: 1218 free(dirbuf, M_MSDOSFSTMP); 1219 return (error); 1220 } 1221 1222 /* 1223 * vp - address of vnode file the file 1224 * bn - which cluster we are interested in mapping to a filesystem block number. 1225 * vpp - returns the vnode for the block special file holding the filesystem 1226 * containing the file of interest 1227 * bnp - address of where to return the filesystem relative block number 1228 */ 1229 int 1230 msdosfs_bmap(void *v) 1231 { 1232 struct vop_bmap_args /* { 1233 struct vnode *a_vp; 1234 daddr_t a_bn; 1235 struct vnode **a_vpp; 1236 daddr_t *a_bnp; 1237 int *a_runp; 1238 } */ *ap = v; 1239 struct denode *dep = VTODE(ap->a_vp); 1240 int run, maxrun; 1241 daddr_t runbn; 1242 int status; 1243 1244 if (ap->a_vpp != NULL) 1245 *ap->a_vpp = dep->de_devvp; 1246 if (ap->a_bnp == NULL) 1247 return (0); 1248 status = msdosfs_pcbmap(dep, ap->a_bn, ap->a_bnp, 0, 0); 1249 1250 /* 1251 * From FreeBSD: 1252 * A little kludgy, but we loop calling pcbmap until we 1253 * reach the end of the contiguous piece, or reach MAXPHYS. 1254 * Since it reduces disk I/Os, the "wasted" CPU is put to 1255 * good use (4 to 5 fold sequential read I/O improvement on USB 1256 * drives). 1257 */ 1258 if (ap->a_runp != NULL) { 1259 /* taken from ufs_bmap */ 1260 maxrun = ulmin(MAXPHYS / dep->de_pmp->pm_bpcluster - 1, 1261 dep->de_pmp->pm_maxcluster - ap->a_bn); 1262 for (run = 1; run <= maxrun; run++) { 1263 if (msdosfs_pcbmap(dep, ap->a_bn + run, &runbn, NULL, 1264 NULL) != 0 || runbn != 1265 *ap->a_bnp + de_cn2bn(dep->de_pmp, run)) 1266 break; 1267 } 1268 *ap->a_runp = run - 1; 1269 } 1270 1271 /* 1272 * We need to scale *ap->a_bnp by sector_size/DEV_BSIZE 1273 */ 1274 *ap->a_bnp = de_bn2kb(dep->de_pmp, *ap->a_bnp); 1275 return status; 1276 } 1277 1278 int 1279 msdosfs_strategy(void *v) 1280 { 1281 struct vop_strategy_args /* { 1282 struct vnode *a_vp; 1283 struct buf *a_bp; 1284 } */ *ap = v; 1285 struct vnode *vp = ap->a_vp; 1286 struct buf *bp = ap->a_bp; 1287 struct denode *dep = VTODE(bp->b_vp); 1288 int error = 0; 1289 1290 if (vp->v_type == VBLK || vp->v_type == VCHR) 1291 panic("msdosfs_strategy: spec"); 1292 /* 1293 * If we don't already know the filesystem relative block number 1294 * then get it using pcbmap(). If pcbmap() returns the block 1295 * number as -1 then we've got a hole in the file. DOS filesystems 1296 * don't allow files with holes, so we shouldn't ever see this. 1297 */ 1298 if (bp->b_blkno == bp->b_lblkno) { 1299 error = msdosfs_pcbmap(dep, de_bn2cn(dep->de_pmp, bp->b_lblkno), 1300 &bp->b_blkno, 0, 0); 1301 if (error) 1302 bp->b_blkno = -1; 1303 if (bp->b_blkno == -1) 1304 clrbuf(bp); 1305 else 1306 bp->b_blkno = de_bn2kb(dep->de_pmp, bp->b_blkno); 1307 } 1308 if (bp->b_blkno == -1) { 1309 biodone(bp); 1310 return (error); 1311 } 1312 1313 /* 1314 * Read/write the block from/to the disk that contains the desired 1315 * file block. 1316 */ 1317 1318 vp = dep->de_devvp; 1319 return (VOP_STRATEGY(vp, bp)); 1320 } 1321 1322 int 1323 msdosfs_print(void *v) 1324 { 1325 struct vop_print_args /* { 1326 struct vnode *vp; 1327 } */ *ap = v; 1328 struct denode *dep = VTODE(ap->a_vp); 1329 1330 printf( 1331 "tag VT_MSDOSFS, startcluster %ld, dircluster %ld, diroffset %ld ", 1332 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset); 1333 printf(" dev %llu, %llu ", (unsigned long long)major(dep->de_dev), 1334 (unsigned long long)minor(dep->de_dev)); 1335 printf("\n"); 1336 return (0); 1337 } 1338 1339 int 1340 msdosfs_advlock(void *v) 1341 { 1342 struct vop_advlock_args /* { 1343 struct vnode *a_vp; 1344 void *a_id; 1345 int a_op; 1346 struct flock *a_fl; 1347 int a_flags; 1348 } */ *ap = v; 1349 struct denode *dep = VTODE(ap->a_vp); 1350 1351 return lf_advlock(ap, &dep->de_lockf, dep->de_FileSize); 1352 } 1353 1354 int 1355 msdosfs_pathconf(void *v) 1356 { 1357 struct vop_pathconf_args /* { 1358 struct vnode *a_vp; 1359 int a_name; 1360 register_t *a_retval; 1361 } */ *ap = v; 1362 1363 switch (ap->a_name) { 1364 case _PC_LINK_MAX: 1365 *ap->a_retval = 1; 1366 return (0); 1367 case _PC_NAME_MAX: 1368 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_namemax; 1369 return (0); 1370 case _PC_PATH_MAX: 1371 *ap->a_retval = PATH_MAX; 1372 return (0); 1373 case _PC_CHOWN_RESTRICTED: 1374 *ap->a_retval = 1; 1375 return (0); 1376 case _PC_NO_TRUNC: 1377 *ap->a_retval = 1; 1378 return (0); 1379 case _PC_SYNC_IO: 1380 *ap->a_retval = 1; 1381 return (0); 1382 case _PC_FILESIZEBITS: 1383 *ap->a_retval = 32; 1384 return (0); 1385 default: 1386 return genfs_pathconf(ap); 1387 } 1388 /* NOTREACHED */ 1389 } 1390 1391 /* 1392 * Flush the blocks of a file to disk. 1393 * 1394 * This function is worthless for vnodes that represent directories. Maybe we 1395 * could just do a sync if they try an fsync on a directory file. 1396 */ 1397 int 1398 msdosfs_fsync(void *v) 1399 { 1400 struct vop_fsync_args /* { 1401 struct vnode *a_vp; 1402 kauth_cred_t a_cred; 1403 int a_flags; 1404 off_t offlo; 1405 off_t offhi; 1406 } */ *ap = v; 1407 struct vnode *vp = ap->a_vp; 1408 int wait; 1409 int error; 1410 1411 wait = (ap->a_flags & FSYNC_WAIT) != 0; 1412 error = vflushbuf(vp, ap->a_flags); 1413 if (error == 0 && (ap->a_flags & FSYNC_DATAONLY) == 0) 1414 error = msdosfs_update(vp, NULL, NULL, wait ? UPDATE_WAIT : 0); 1415 1416 if (error == 0 && ap->a_flags & FSYNC_CACHE) { 1417 struct denode *dep = VTODE(vp); 1418 struct vnode *devvp = dep->de_devvp; 1419 1420 int l = 0; 1421 error = VOP_IOCTL(devvp, DIOCCACHESYNC, &l, FWRITE, 1422 curlwp->l_cred); 1423 } 1424 1425 return (error); 1426 } 1427 1428 void 1429 msdosfs_detimes(struct denode *dep, const struct timespec *acc, 1430 const struct timespec *mod, const struct timespec *cre, int gmtoff) 1431 { 1432 struct timespec *ts = NULL, tsb; 1433 1434 KASSERT(dep->de_flag & (DE_UPDATE | DE_CREATE | DE_ACCESS)); 1435 /* XXX just call getnanotime early and use result if needed? */ 1436 dep->de_flag |= DE_MODIFIED; 1437 if (dep->de_flag & DE_UPDATE) { 1438 if (mod == NULL) { 1439 getnanotime(&tsb); 1440 mod = ts = &tsb; 1441 } 1442 msdosfs_unix2dostime(mod, gmtoff, &dep->de_MDate, 1443 &dep->de_MTime, NULL); 1444 dep->de_Attributes |= ATTR_ARCHIVE; 1445 } 1446 if ((dep->de_pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0) { 1447 if (dep->de_flag & DE_ACCESS) { 1448 if (acc == NULL) 1449 acc = ts == NULL ? 1450 (getnanotime(&tsb), ts = &tsb) : ts; 1451 msdosfs_unix2dostime(acc, gmtoff, &dep->de_ADate, 1452 NULL, NULL); 1453 } 1454 if (dep->de_flag & DE_CREATE) { 1455 if (cre == NULL) 1456 cre = ts == NULL ? 1457 (getnanotime(&tsb), ts = &tsb) : ts; 1458 msdosfs_unix2dostime(cre, gmtoff, &dep->de_CDate, 1459 &dep->de_CTime, &dep->de_CHun); 1460 } 1461 } 1462 1463 dep->de_flag &= ~(DE_UPDATE | DE_CREATE | DE_ACCESS); 1464 } 1465 1466 /* Global vfs data structures for msdosfs */ 1467 int (**msdosfs_vnodeop_p)(void *); 1468 const struct vnodeopv_entry_desc msdosfs_vnodeop_entries[] = { 1469 { &vop_default_desc, vn_default_error }, 1470 { &vop_parsepath_desc, genfs_parsepath }, /* parsepath */ 1471 { &vop_lookup_desc, msdosfs_lookup }, /* lookup */ 1472 { &vop_create_desc, msdosfs_create }, /* create */ 1473 { &vop_mknod_desc, genfs_eopnotsupp }, /* mknod */ 1474 { &vop_open_desc, genfs_nullop }, /* open */ 1475 { &vop_close_desc, msdosfs_close }, /* close */ 1476 { &vop_access_desc, msdosfs_access }, /* access */ 1477 { &vop_accessx_desc, genfs_accessx }, /* accessx */ 1478 { &vop_getattr_desc, msdosfs_getattr }, /* getattr */ 1479 { &vop_setattr_desc, msdosfs_setattr }, /* setattr */ 1480 { &vop_read_desc, msdosfs_read }, /* read */ 1481 { &vop_write_desc, msdosfs_write }, /* write */ 1482 { &vop_fallocate_desc, genfs_eopnotsupp }, /* fallocate */ 1483 { &vop_fdiscard_desc, genfs_eopnotsupp }, /* fdiscard */ 1484 { &vop_fcntl_desc, genfs_fcntl }, /* fcntl */ 1485 { &vop_ioctl_desc, genfs_enoioctl }, /* ioctl */ 1486 { &vop_poll_desc, genfs_poll }, /* poll */ 1487 { &vop_kqfilter_desc, genfs_kqfilter }, /* kqfilter */ 1488 { &vop_revoke_desc, genfs_revoke }, /* revoke */ 1489 { &vop_mmap_desc, genfs_mmap }, /* mmap */ 1490 { &vop_fsync_desc, msdosfs_fsync }, /* fsync */ 1491 { &vop_seek_desc, genfs_seek }, /* seek */ 1492 { &vop_remove_desc, msdosfs_remove }, /* remove */ 1493 { &vop_link_desc, genfs_eopnotsupp }, /* link */ 1494 { &vop_rename_desc, msdosfs_rename }, /* rename */ 1495 { &vop_mkdir_desc, msdosfs_mkdir }, /* mkdir */ 1496 { &vop_rmdir_desc, msdosfs_rmdir }, /* rmdir */ 1497 { &vop_symlink_desc, genfs_eopnotsupp }, /* symlink */ 1498 { &vop_readdir_desc, msdosfs_readdir }, /* readdir */ 1499 { &vop_readlink_desc, genfs_einval }, /* readlink */ 1500 { &vop_abortop_desc, genfs_abortop }, /* abortop */ 1501 { &vop_inactive_desc, msdosfs_inactive }, /* inactive */ 1502 { &vop_reclaim_desc, msdosfs_reclaim }, /* reclaim */ 1503 { &vop_lock_desc, genfs_lock }, /* lock */ 1504 { &vop_unlock_desc, genfs_unlock }, /* unlock */ 1505 { &vop_bmap_desc, msdosfs_bmap }, /* bmap */ 1506 { &vop_strategy_desc, msdosfs_strategy }, /* strategy */ 1507 { &vop_print_desc, msdosfs_print }, /* print */ 1508 { &vop_islocked_desc, genfs_islocked }, /* islocked */ 1509 { &vop_pathconf_desc, msdosfs_pathconf }, /* pathconf */ 1510 { &vop_advlock_desc, msdosfs_advlock }, /* advlock */ 1511 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 1512 { &vop_getpages_desc, genfs_getpages }, /* getpages */ 1513 { &vop_putpages_desc, genfs_putpages }, /* putpages */ 1514 { NULL, NULL } 1515 }; 1516 const struct vnodeopv_desc msdosfs_vnodeop_opv_desc = 1517 { &msdosfs_vnodeop_p, msdosfs_vnodeop_entries }; 1518
Indexes created Sun Sep 21 20:09:37 GMT 2025