1 /* $NetBSD: msdosfs_vnops.c,v 1.71 2011/01/02 05:09:30 dholland 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@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@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 1.71 2011/01/02 05:09:30 dholland 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/fstrans.h> 64 #include <sys/vnode.h> 65 #include <sys/signalvar.h> 66 #include <sys/malloc.h> 67 #include <sys/dirent.h> 68 #include <sys/lockf.h> 69 #include <sys/kauth.h> 70 71 #include <miscfs/genfs/genfs.h> 72 #include <miscfs/specfs/specdev.h> /* XXX */ /* defines v_rdev */ 73 74 #include <uvm/uvm_extern.h> 75 76 #include <fs/msdosfs/bpb.h> 77 #include <fs/msdosfs/direntry.h> 78 #include <fs/msdosfs/denode.h> 79 #include <fs/msdosfs/msdosfsmount.h> 80 #include <fs/msdosfs/fat.h> 81 82 /* 83 * Some general notes: 84 * 85 * In the ufs filesystem the inodes, superblocks, and indirect blocks are 86 * read/written using the vnode for the filesystem. Blocks that represent 87 * the contents of a file are read/written using the vnode for the file 88 * (including directories when they are read/written as files). This 89 * presents problems for the dos filesystem because data that should be in 90 * an inode (if dos had them) resides in the directory itself. Since we 91 * must update directory entries without the benefit of having the vnode 92 * for the directory we must use the vnode for the filesystem. This means 93 * that when a directory is actually read/written (via read, write, or 94 * readdir, or seek) we must use the vnode for the filesystem instead of 95 * the vnode for the directory as would happen in ufs. This is to insure we 96 * retrieve the correct block from the buffer cache since the hash value is 97 * based upon the vnode address and the desired block number. 98 */ 99 100 /* 101 * Create a regular file. On entry the directory to contain the file being 102 * created is locked. We must release before we return. 103 */ 104 int 105 msdosfs_create(void *v) 106 { 107 struct vop_create_args /* { 108 struct vnode *a_dvp; 109 struct vnode **a_vpp; 110 struct componentname *a_cnp; 111 struct vattr *a_vap; 112 } */ *ap = v; 113 struct componentname *cnp = ap->a_cnp; 114 struct denode ndirent; 115 struct denode *dep; 116 struct denode *pdep = VTODE(ap->a_dvp); 117 int error; 118 119 #ifdef MSDOSFS_DEBUG 120 printf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap); 121 #endif 122 123 fstrans_start(ap->a_dvp->v_mount, FSTRANS_SHARED); 124 /* 125 * If this is the root directory and there is no space left we 126 * can't do anything. This is because the root directory can not 127 * change size. 128 */ 129 if (pdep->de_StartCluster == MSDOSFSROOT 130 && pdep->de_fndoffset >= pdep->de_FileSize) { 131 error = ENOSPC; 132 goto bad; 133 } 134 135 /* 136 * Create a directory entry for the file, then call createde() to 137 * have it installed. NOTE: DOS files are always executable. We 138 * use the absence of the owner write bit to make the file 139 * readonly. 140 */ 141 memset(&ndirent, 0, sizeof(ndirent)); 142 if ((error = uniqdosname(pdep, cnp, ndirent.de_Name)) != 0) 143 goto bad; 144 145 ndirent.de_Attributes = (ap->a_vap->va_mode & S_IWUSR) ? 146 ATTR_ARCHIVE : ATTR_ARCHIVE | ATTR_READONLY; 147 ndirent.de_StartCluster = 0; 148 ndirent.de_FileSize = 0; 149 ndirent.de_dev = pdep->de_dev; 150 ndirent.de_devvp = pdep->de_devvp; 151 ndirent.de_pmp = pdep->de_pmp; 152 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 153 DETIMES(&ndirent, NULL, NULL, NULL, pdep->de_pmp->pm_gmtoff); 154 if ((error = createde(&ndirent, pdep, &dep, cnp)) != 0) 155 goto bad; 156 fstrans_done(ap->a_dvp->v_mount); 157 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 158 vput(ap->a_dvp); 159 *ap->a_vpp = DETOV(dep); 160 return (0); 161 162 bad: 163 fstrans_done(ap->a_dvp->v_mount); 164 vput(ap->a_dvp); 165 return (error); 166 } 167 168 int 169 msdosfs_close(void *v) 170 { 171 struct vop_close_args /* { 172 struct vnode *a_vp; 173 int a_fflag; 174 kauth_cred_t a_cred; 175 } */ *ap = v; 176 struct vnode *vp = ap->a_vp; 177 struct denode *dep = VTODE(vp); 178 179 fstrans_start(vp->v_mount, FSTRANS_SHARED); 180 mutex_enter(&vp->v_interlock); 181 if (vp->v_usecount > 1) 182 DETIMES(dep, NULL, NULL, NULL, dep->de_pmp->pm_gmtoff); 183 mutex_exit(&vp->v_interlock); 184 fstrans_done(vp->v_mount); 185 return (0); 186 } 187 188 static int 189 msdosfs_check_possible(struct vnode *vp, struct denode *dep, mode_t mode) 190 { 191 192 /* 193 * Disallow write attempts on read-only file systems; 194 * unless the file is a socket, fifo, or a block or 195 * character device resident on the file system. 196 */ 197 if (mode & VWRITE) { 198 switch (vp->v_type) { 199 case VDIR: 200 case VLNK: 201 case VREG: 202 if (vp->v_mount->mnt_flag & MNT_RDONLY) 203 return (EROFS); 204 default: 205 break; 206 } 207 } 208 209 return 0; 210 } 211 212 static int 213 msdosfs_check_permitted(struct vnode *vp, struct denode *dep, mode_t mode, 214 kauth_cred_t cred) 215 { 216 struct msdosfsmount *pmp = dep->de_pmp; 217 mode_t file_mode; 218 219 if ((dep->de_Attributes & ATTR_READONLY) == 0) 220 file_mode = S_IRWXU|S_IRWXG|S_IRWXO; 221 else 222 file_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 223 224 return genfs_can_access(vp->v_type, 225 file_mode & (vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask), 226 pmp->pm_uid, pmp->pm_gid, mode, cred); 227 } 228 229 int 230 msdosfs_access(void *v) 231 { 232 struct vop_access_args /* { 233 struct vnode *a_vp; 234 int a_mode; 235 kauth_cred_t a_cred; 236 } */ *ap = v; 237 struct vnode *vp = ap->a_vp; 238 struct denode *dep = VTODE(vp); 239 int error; 240 241 error = msdosfs_check_possible(vp, dep, ap->a_mode); 242 if (error) 243 return error; 244 245 error = msdosfs_check_permitted(vp, dep, ap->a_mode, ap->a_cred); 246 247 return error; 248 } 249 250 int 251 msdosfs_getattr(void *v) 252 { 253 struct vop_getattr_args /* { 254 struct vnode *a_vp; 255 struct vattr *a_vap; 256 kauth_cred_t a_cred; 257 } */ *ap = v; 258 struct denode *dep = VTODE(ap->a_vp); 259 struct msdosfsmount *pmp = dep->de_pmp; 260 struct vattr *vap = ap->a_vap; 261 mode_t mode; 262 u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 263 ino_t fileid; 264 265 fstrans_start(ap->a_vp->v_mount, FSTRANS_SHARED); 266 DETIMES(dep, NULL, NULL, NULL, pmp->pm_gmtoff); 267 vap->va_fsid = dep->de_dev; 268 /* 269 * The following computation of the fileid must be the same as that 270 * used in msdosfs_readdir() to compute d_fileno. If not, pwd 271 * doesn't work. 272 */ 273 if (dep->de_Attributes & ATTR_DIRECTORY) { 274 fileid = cntobn(pmp, (ino_t)dep->de_StartCluster) * dirsperblk; 275 if (dep->de_StartCluster == MSDOSFSROOT) 276 fileid = 1; 277 } else { 278 fileid = cntobn(pmp, (ino_t)dep->de_dirclust) * dirsperblk; 279 if (dep->de_dirclust == MSDOSFSROOT) 280 fileid = roottobn(pmp, 0) * dirsperblk; 281 fileid += dep->de_diroffset / sizeof(struct direntry); 282 } 283 vap->va_fileid = fileid; 284 if ((dep->de_Attributes & ATTR_READONLY) == 0) 285 mode = S_IRWXU|S_IRWXG|S_IRWXO; 286 else 287 mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 288 vap->va_mode = 289 mode & (ap->a_vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); 290 vap->va_uid = pmp->pm_uid; 291 vap->va_gid = pmp->pm_gid; 292 vap->va_nlink = 1; 293 vap->va_rdev = 0; 294 vap->va_size = ap->a_vp->v_size; 295 dos2unixtime(dep->de_MDate, dep->de_MTime, 0, pmp->pm_gmtoff, 296 &vap->va_mtime); 297 if (dep->de_pmp->pm_flags & MSDOSFSMNT_LONGNAME) { 298 dos2unixtime(dep->de_ADate, 0, 0, pmp->pm_gmtoff, 299 &vap->va_atime); 300 dos2unixtime(dep->de_CDate, dep->de_CTime, dep->de_CHun, 301 pmp->pm_gmtoff, &vap->va_ctime); 302 } else { 303 vap->va_atime = vap->va_mtime; 304 vap->va_ctime = vap->va_mtime; 305 } 306 vap->va_flags = 0; 307 if ((dep->de_Attributes & ATTR_ARCHIVE) == 0) 308 vap->va_mode |= S_ARCH1; 309 vap->va_gen = 0; 310 vap->va_blocksize = pmp->pm_bpcluster; 311 vap->va_bytes = 312 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask; 313 vap->va_type = ap->a_vp->v_type; 314 fstrans_done(ap->a_vp->v_mount); 315 return (0); 316 } 317 318 int 319 msdosfs_setattr(void *v) 320 { 321 struct vop_setattr_args /* { 322 struct vnode *a_vp; 323 struct vattr *a_vap; 324 kauth_cred_t a_cred; 325 } */ *ap = v; 326 int error = 0, de_changed = 0; 327 struct denode *dep = VTODE(ap->a_vp); 328 struct msdosfsmount *pmp = dep->de_pmp; 329 struct vnode *vp = ap->a_vp; 330 struct vattr *vap = ap->a_vap; 331 kauth_cred_t cred = ap->a_cred; 332 333 #ifdef MSDOSFS_DEBUG 334 printf("msdosfs_setattr(): vp %p, vap %p, cred %p\n", 335 ap->a_vp, vap, cred); 336 #endif 337 /* 338 * Note we silently ignore uid or gid changes. 339 */ 340 if ((vap->va_type != VNON) || (vap->va_nlink != (nlink_t)VNOVAL) || 341 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 342 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 343 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL) || 344 (vap->va_uid != VNOVAL && vap->va_uid != pmp->pm_uid) || 345 (vap->va_gid != VNOVAL && vap->va_gid != pmp->pm_gid)) { 346 #ifdef MSDOSFS_DEBUG 347 printf("msdosfs_setattr(): returning EINVAL\n"); 348 printf(" va_type %d, va_nlink %x, va_fsid %"PRIx64", va_fileid %llx\n", 349 vap->va_type, vap->va_nlink, vap->va_fsid, 350 (unsigned long long)vap->va_fileid); 351 printf(" va_blocksize %lx, va_rdev %"PRIx64", va_bytes %"PRIx64", va_gen %lx\n", 352 vap->va_blocksize, vap->va_rdev, vap->va_bytes, vap->va_gen); 353 #endif 354 return (EINVAL); 355 } 356 /* 357 * Silently ignore attributes modifications on directories. 358 */ 359 if (ap->a_vp->v_type == VDIR) 360 return 0; 361 362 fstrans_start(vp->v_mount, FSTRANS_SHARED); 363 if (vap->va_size != VNOVAL) { 364 if (vp->v_mount->mnt_flag & MNT_RDONLY) { 365 error = EROFS; 366 goto bad; 367 } 368 error = detrunc(dep, (u_long)vap->va_size, 0, cred); 369 if (error) 370 goto bad; 371 de_changed = 1; 372 } 373 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 374 if (vp->v_mount->mnt_flag & MNT_RDONLY) { 375 error = EROFS; 376 goto bad; 377 } 378 error = genfs_can_chtimes(ap->a_vp, vap->va_vaflags, 379 pmp->pm_uid, cred); 380 if (error) 381 goto bad; 382 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 && 383 vap->va_atime.tv_sec != VNOVAL) 384 unix2dostime(&vap->va_atime, pmp->pm_gmtoff, &dep->de_ADate, NULL, NULL); 385 if (vap->va_mtime.tv_sec != VNOVAL) 386 unix2dostime(&vap->va_mtime, pmp->pm_gmtoff, &dep->de_MDate, &dep->de_MTime, NULL); 387 dep->de_Attributes |= ATTR_ARCHIVE; 388 dep->de_flag |= DE_MODIFIED; 389 de_changed = 1; 390 } 391 /* 392 * DOS files only have the ability to have their writability 393 * attribute set, so we use the owner write bit to set the readonly 394 * attribute. 395 */ 396 if (vap->va_mode != (mode_t)VNOVAL) { 397 if (vp->v_mount->mnt_flag & MNT_RDONLY) { 398 error = EROFS; 399 goto bad; 400 } 401 if (kauth_cred_geteuid(cred) != pmp->pm_uid && 402 (error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, 403 NULL))) 404 goto bad; 405 /* We ignore the read and execute bits. */ 406 if (vap->va_mode & S_IWUSR) 407 dep->de_Attributes &= ~ATTR_READONLY; 408 else 409 dep->de_Attributes |= ATTR_READONLY; 410 dep->de_flag |= DE_MODIFIED; 411 de_changed = 1; 412 } 413 /* 414 * Allow the `archived' bit to be toggled. 415 */ 416 if (vap->va_flags != VNOVAL) { 417 if (vp->v_mount->mnt_flag & MNT_RDONLY) { 418 error = EROFS; 419 goto bad; 420 } 421 if (kauth_cred_geteuid(cred) != pmp->pm_uid && 422 (error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, 423 NULL))) 424 goto bad; 425 if (vap->va_flags & SF_ARCHIVED) 426 dep->de_Attributes &= ~ATTR_ARCHIVE; 427 else 428 dep->de_Attributes |= ATTR_ARCHIVE; 429 dep->de_flag |= DE_MODIFIED; 430 de_changed = 1; 431 } 432 433 if (de_changed) { 434 VN_KNOTE(vp, NOTE_ATTRIB); 435 error = deupdat(dep, 1); 436 if (error) 437 goto bad; 438 } 439 440 bad: 441 fstrans_done(vp->v_mount); 442 return error; 443 } 444 445 int 446 msdosfs_read(void *v) 447 { 448 struct vop_read_args /* { 449 struct vnode *a_vp; 450 struct uio *a_uio; 451 int a_ioflag; 452 kauth_cred_t a_cred; 453 } */ *ap = v; 454 int error = 0; 455 int64_t diff; 456 int blsize; 457 long n; 458 long on; 459 daddr_t lbn; 460 vsize_t bytelen; 461 struct buf *bp; 462 struct vnode *vp = ap->a_vp; 463 struct denode *dep = VTODE(vp); 464 struct msdosfsmount *pmp = dep->de_pmp; 465 struct uio *uio = ap->a_uio; 466 467 /* 468 * If they didn't ask for any data, then we are done. 469 */ 470 471 if (uio->uio_resid == 0) 472 return (0); 473 if (uio->uio_offset < 0) 474 return (EINVAL); 475 if (uio->uio_offset >= dep->de_FileSize) 476 return (0); 477 478 fstrans_start(vp->v_mount, FSTRANS_SHARED); 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_UNMAP_FLAG(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 /* file size (and hence diff) may be up to 4GB */ 505 diff = dep->de_FileSize - uio->uio_offset; 506 if (diff < n) 507 n = (long) diff; 508 509 /* convert cluster # to sector # */ 510 error = pcbmap(dep, lbn, &lbn, 0, &blsize); 511 if (error) 512 goto bad; 513 514 /* 515 * If we are operating on a directory file then be sure to 516 * do i/o with the vnode for the filesystem instead of the 517 * vnode for the directory. 518 */ 519 error = bread(pmp->pm_devvp, de_bn2kb(pmp, lbn), blsize, 520 NOCRED, 0, &bp); 521 n = MIN(n, pmp->pm_bpcluster - bp->b_resid); 522 if (error) { 523 brelse(bp, 0); 524 goto bad; 525 } 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 error = deupdat(dep, 1); 533 bad: 534 fstrans_done(vp->v_mount); 535 return (error); 536 } 537 538 /* 539 * Write data to a file or directory. 540 */ 541 int 542 msdosfs_write(void *v) 543 { 544 struct vop_write_args /* { 545 struct vnode *a_vp; 546 struct uio *a_uio; 547 int a_ioflag; 548 kauth_cred_t a_cred; 549 } */ *ap = v; 550 int resid, extended = 0; 551 int error = 0; 552 int ioflag = ap->a_ioflag; 553 u_long osize; 554 u_long count; 555 vsize_t bytelen; 556 off_t oldoff; 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 fstrans_start(vp->v_mount, FSTRANS_SHARED); 593 /* 594 * If the offset we are starting the write at is beyond the end of 595 * the file, then they've done a seek. Unix filesystems allow 596 * files with holes in them, DOS doesn't so we must fill the hole 597 * with zeroed blocks. 598 */ 599 if (uio->uio_offset > dep->de_FileSize) { 600 if ((error = deextend(dep, uio->uio_offset, cred)) != 0) { 601 fstrans_done(vp->v_mount); 602 return (error); 603 } 604 } 605 606 /* 607 * Remember some values in case the write fails. 608 */ 609 async = vp->v_mount->mnt_flag & MNT_ASYNC; 610 resid = uio->uio_resid; 611 osize = dep->de_FileSize; 612 613 /* 614 * If we write beyond the end of the file, extend it to its ultimate 615 * size ahead of the time to hopefully get a contiguous area. 616 */ 617 if (uio->uio_offset + resid > osize) { 618 count = de_clcount(pmp, uio->uio_offset + resid) - 619 de_clcount(pmp, osize); 620 if ((error = extendfile(dep, count, NULL, NULL, 0))) 621 goto errexit; 622 623 dep->de_FileSize = uio->uio_offset + resid; 624 /* hint uvm to not read in extended part */ 625 uvm_vnp_setwritesize(vp, dep->de_FileSize); 626 extended = 1; 627 } 628 629 do { 630 oldoff = uio->uio_offset; 631 bytelen = uio->uio_resid; 632 633 error = ubc_uiomove(&vp->v_uobj, uio, bytelen, 634 IO_ADV_DECODE(ioflag), UBC_WRITE | UBC_UNMAP_FLAG(vp)); 635 if (error) 636 break; 637 638 /* 639 * flush what we just wrote if necessary. 640 * XXXUBC simplistic async flushing. 641 */ 642 643 if (!async && oldoff >> 16 != uio->uio_offset >> 16) { 644 mutex_enter(&vp->v_interlock); 645 error = VOP_PUTPAGES(vp, (oldoff >> 16) << 16, 646 (uio->uio_offset >> 16) << 16, PGO_CLEANIT); 647 } 648 } while (error == 0 && uio->uio_resid > 0); 649 650 /* set final size */ 651 uvm_vnp_setsize(vp, dep->de_FileSize); 652 if (error == 0 && ioflag & IO_SYNC) { 653 mutex_enter(&vp->v_interlock); 654 error = VOP_PUTPAGES(vp, trunc_page(oldoff), 655 round_page(oldoff + bytelen), PGO_CLEANIT | PGO_SYNCIO); 656 } 657 dep->de_flag |= DE_UPDATE; 658 659 /* 660 * If the write failed and they want us to, truncate the file back 661 * to the size it was before the write was attempted. 662 */ 663 errexit: 664 if (resid > uio->uio_resid) 665 VN_KNOTE(vp, NOTE_WRITE | (extended ? NOTE_EXTEND : 0)); 666 if (error) { 667 detrunc(dep, osize, ioflag & IO_SYNC, NOCRED); 668 uio->uio_offset -= resid - uio->uio_resid; 669 uio->uio_resid = resid; 670 } else if ((ioflag & IO_SYNC) == IO_SYNC) 671 error = deupdat(dep, 1); 672 fstrans_done(vp->v_mount); 673 KASSERT(vp->v_size == dep->de_FileSize); 674 return (error); 675 } 676 677 int 678 msdosfs_update(struct vnode *vp, const struct timespec *acc, 679 const struct timespec *mod, int flags) 680 { 681 struct buf *bp; 682 struct direntry *dirp; 683 struct denode *dep; 684 int error; 685 686 if (vp->v_mount->mnt_flag & MNT_RDONLY) 687 return (0); 688 dep = VTODE(vp); 689 DETIMES(dep, acc, mod, NULL, dep->de_pmp->pm_gmtoff); 690 if ((dep->de_flag & DE_MODIFIED) == 0) 691 return (0); 692 dep->de_flag &= ~DE_MODIFIED; 693 if (dep->de_Attributes & ATTR_DIRECTORY) 694 return (0); 695 if (dep->de_refcnt <= 0) 696 return (0); 697 error = readde(dep, &bp, &dirp); 698 if (error) 699 return (error); 700 DE_EXTERNALIZE(dirp, dep); 701 if (flags & (UPDATE_WAIT|UPDATE_DIROP)) 702 return (bwrite(bp)); 703 else { 704 bdwrite(bp); 705 return (0); 706 } 707 } 708 709 /* 710 * Flush the blocks of a file to disk. 711 * 712 * This function is worthless for vnodes that represent directories. Maybe we 713 * could just do a sync if they try an fsync on a directory file. 714 */ 715 int 716 msdosfs_remove(void *v) 717 { 718 struct vop_remove_args /* { 719 struct vnode *a_dvp; 720 struct vnode *a_vp; 721 struct componentname *a_cnp; 722 } */ *ap = v; 723 struct denode *dep = VTODE(ap->a_vp); 724 struct denode *ddep = VTODE(ap->a_dvp); 725 int error; 726 727 fstrans_start(ap->a_dvp->v_mount, FSTRANS_SHARED); 728 if (ap->a_vp->v_type == VDIR) 729 error = EPERM; 730 else 731 error = removede(ddep, dep); 732 #ifdef MSDOSFS_DEBUG 733 printf("msdosfs_remove(), dep %p, v_usecount %d\n", 734 dep, ap->a_vp->v_usecount); 735 #endif 736 VN_KNOTE(ap->a_vp, NOTE_DELETE); 737 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 738 if (ddep == dep) 739 vrele(ap->a_vp); 740 else 741 vput(ap->a_vp); /* causes msdosfs_inactive() to be called 742 * via vrele() */ 743 vput(ap->a_dvp); 744 fstrans_done(ap->a_dvp->v_mount); 745 return (error); 746 } 747 748 /* 749 * Renames on files require moving the denode to a new hash queue since the 750 * denode's location is used to compute which hash queue to put the file 751 * in. Unless it is a rename in place. For example "mv a b". 752 * 753 * What follows is the basic algorithm: 754 * 755 * if (file move) { 756 * if (dest file exists) { 757 * remove dest file 758 * } 759 * if (dest and src in same directory) { 760 * rewrite name in existing directory slot 761 * } else { 762 * write new entry in dest directory 763 * update offset and dirclust in denode 764 * move denode to new hash chain 765 * clear old directory entry 766 * } 767 * } else { 768 * directory move 769 * if (dest directory exists) { 770 * if (dest is not empty) { 771 * return ENOTEMPTY 772 * } 773 * remove dest directory 774 * } 775 * if (dest and src in same directory) { 776 * rewrite name in existing entry 777 * } else { 778 * be sure dest is not a child of src directory 779 * write entry in dest directory 780 * update "." and ".." in moved directory 781 * update offset and dirclust in denode 782 * move denode to new hash chain 783 * clear old directory entry for moved directory 784 * } 785 * } 786 * 787 * On entry: 788 * source's parent directory is unlocked 789 * source file or directory is unlocked 790 * destination's parent directory is locked 791 * destination file or directory is locked if it exists 792 * 793 * On exit: 794 * all denodes should be released 795 * 796 * Notes: 797 * I'm not sure how the memory containing the pathnames pointed at by the 798 * componentname structures is freed, there may be some memory bleeding 799 * for each rename done. 800 * 801 * --More-- Notes: 802 * This routine needs help. badly. 803 */ 804 int 805 msdosfs_rename(void *v) 806 { 807 struct vop_rename_args /* { 808 struct vnode *a_fdvp; 809 struct vnode *a_fvp; 810 struct componentname *a_fcnp; 811 struct vnode *a_tdvp; 812 struct vnode *a_tvp; 813 struct componentname *a_tcnp; 814 } */ *ap = v; 815 struct vnode *tvp = ap->a_tvp; 816 struct vnode *tdvp = ap->a_tdvp; 817 struct vnode *fvp = ap->a_fvp; 818 struct vnode *fdvp = ap->a_fdvp; 819 struct componentname *tcnp = ap->a_tcnp; 820 struct componentname *fcnp = ap->a_fcnp; 821 struct denode *ip, *xp, *dp, *zp; 822 u_char toname[11], oldname[11]; 823 u_long from_diroffset, to_diroffset; 824 u_char to_count; 825 int doingdirectory = 0, newparent = 0; 826 int error; 827 u_long cn; 828 daddr_t bn; 829 struct msdosfsmount *pmp; 830 struct direntry *dotdotp; 831 struct buf *bp; 832 833 pmp = VFSTOMSDOSFS(fdvp->v_mount); 834 835 /* 836 * Check for cross-device rename. 837 */ 838 if ((fvp->v_mount != tdvp->v_mount) || 839 (tvp && (fvp->v_mount != tvp->v_mount))) { 840 error = EXDEV; 841 abortit: 842 VOP_ABORTOP(tdvp, tcnp); 843 if (tdvp == tvp) 844 vrele(tdvp); 845 else 846 vput(tdvp); 847 if (tvp) 848 vput(tvp); 849 VOP_ABORTOP(fdvp, fcnp); 850 vrele(fdvp); 851 vrele(fvp); 852 return (error); 853 } 854 855 /* 856 * If source and dest are the same, do nothing. 857 */ 858 if (tvp == fvp) { 859 error = 0; 860 goto abortit; 861 } 862 863 /* 864 * XXX: This can deadlock since we hold tdvp/tvp locked. 865 * But I'm not going to fix it now. 866 */ 867 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0) 868 goto abortit; 869 dp = VTODE(fdvp); 870 ip = VTODE(fvp); 871 872 /* 873 * Be sure we are not renaming ".", "..", or an alias of ".". This 874 * leads to a crippled directory tree. It's pretty tough to do a 875 * "ls" or "pwd" with the "." directory entry missing, and "cd .." 876 * doesn't work if the ".." entry is missing. 877 */ 878 if (ip->de_Attributes & ATTR_DIRECTORY) { 879 /* 880 * Avoid ".", "..", and aliases of "." for obvious reasons. 881 */ 882 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 883 dp == ip || 884 (fcnp->cn_flags & ISDOTDOT) || 885 (tcnp->cn_flags & ISDOTDOT) || 886 (ip->de_flag & DE_RENAME)) { 887 VOP_UNLOCK(fvp); 888 error = EINVAL; 889 goto abortit; 890 } 891 ip->de_flag |= DE_RENAME; 892 doingdirectory++; 893 } 894 VN_KNOTE(fdvp, NOTE_WRITE); /* XXXLUKEM/XXX: right place? */ 895 896 fstrans_start(fdvp->v_mount, FSTRANS_SHARED); 897 /* 898 * When the target exists, both the directory 899 * and target vnodes are returned locked. 900 */ 901 dp = VTODE(tdvp); 902 xp = tvp ? VTODE(tvp) : NULL; 903 /* 904 * Remember direntry place to use for destination 905 */ 906 to_diroffset = dp->de_fndoffset; 907 to_count = dp->de_fndcnt; 908 909 /* 910 * If ".." must be changed (ie the directory gets a new 911 * parent) then the source directory must not be in the 912 * directory hierarchy above the target, as this would 913 * orphan everything below the source directory. Also 914 * the user must have write permission in the source so 915 * as to be able to change "..". We must repeat the call 916 * to namei, as the parent directory is unlocked by the 917 * call to doscheckpath(). 918 */ 919 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred); 920 VOP_UNLOCK(fvp); 921 if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster) 922 newparent = 1; 923 924 if (doingdirectory && newparent) { 925 if (error) /* write access check above */ 926 goto tdvpbad; 927 if (xp != NULL) 928 vput(tvp); 929 tvp = NULL; 930 /* 931 * doscheckpath() vput()'s tdvp (dp == VTODE(tdvp)), 932 * so we have to get an extra ref to it first, and 933 * because it's been unlocked we need to do a relookup 934 * afterwards in case tvp has changed. 935 */ 936 vref(tdvp); 937 if ((error = doscheckpath(ip, dp)) != 0) 938 goto out; 939 vn_lock(tdvp, LK_EXCLUSIVE | LK_RETRY); 940 if ((error = relookup(tdvp, &tvp, tcnp, 0)) != 0) { 941 VOP_UNLOCK(tdvp); 942 goto out; 943 } 944 dp = VTODE(tdvp); 945 xp = tvp ? VTODE(tvp) : NULL; 946 } 947 948 if (xp != NULL) { 949 /* 950 * Target must be empty if a directory and have no links 951 * to it. Also, ensure source and target are compatible 952 * (both directories, or both not directories). 953 */ 954 if (xp->de_Attributes & ATTR_DIRECTORY) { 955 if (!dosdirempty(xp)) { 956 error = ENOTEMPTY; 957 goto tdvpbad; 958 } 959 if (!doingdirectory) { 960 error = ENOTDIR; 961 goto tdvpbad; 962 } 963 } else if (doingdirectory) { 964 error = EISDIR; 965 goto tdvpbad; 966 } 967 if ((error = removede(dp, xp)) != 0) 968 goto tdvpbad; 969 VN_KNOTE(tdvp, NOTE_WRITE); 970 VN_KNOTE(tvp, NOTE_DELETE); 971 cache_purge(tvp); 972 vput(tvp); 973 tvp = NULL; 974 xp = NULL; 975 } 976 977 /* 978 * Convert the filename in tcnp into a dos filename. We copy this 979 * into the denode and directory entry for the destination 980 * file/directory. 981 */ 982 if ((error = uniqdosname(VTODE(tdvp), tcnp, toname)) != 0) { 983 fstrans_done(fdvp->v_mount); 984 goto abortit; 985 } 986 987 /* 988 * Since from wasn't locked at various places above, 989 * have to do a relookup here. 990 */ 991 fcnp->cn_flags &= ~MODMASK; 992 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 993 VOP_UNLOCK(tdvp); 994 vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 995 if ((error = relookup(fdvp, &fvp, fcnp, 0))) { 996 VOP_UNLOCK(fdvp); 997 vrele(ap->a_fvp); 998 vrele(tdvp); 999 fstrans_done(fdvp->v_mount); 1000 return (error); 1001 } 1002 if (fvp == NULL) { 1003 /* 1004 * From name has disappeared. 1005 */ 1006 if (doingdirectory) 1007 panic("rename: lost dir entry"); 1008 vput(fdvp); 1009 vrele(ap->a_fvp); 1010 vrele(tdvp); 1011 fstrans_done(fdvp->v_mount); 1012 return 0; 1013 } 1014 VOP_UNLOCK(fdvp); 1015 xp = VTODE(fvp); 1016 zp = VTODE(fdvp); 1017 from_diroffset = zp->de_fndoffset; 1018 1019 /* 1020 * Ensure that the directory entry still exists and has not 1021 * changed till now. If the source is a file the entry may 1022 * have been unlinked or renamed. In either case there is 1023 * no further work to be done. If the source is a directory 1024 * then it cannot have been rmdir'ed or renamed; this is 1025 * prohibited by the DE_RENAME flag. 1026 */ 1027 if (xp != ip) { 1028 if (doingdirectory) 1029 panic("rename: lost dir entry"); 1030 vrele(ap->a_fvp); 1031 xp = NULL; 1032 } else { 1033 vrele(fvp); 1034 xp = NULL; 1035 1036 /* 1037 * First write a new entry in the destination 1038 * directory and mark the entry in the source directory 1039 * as deleted. Then move the denode to the correct hash 1040 * chain for its new location in the filesystem. And, if 1041 * we moved a directory, then update its .. entry to point 1042 * to the new parent directory. 1043 */ 1044 memcpy(oldname, ip->de_Name, 11); 1045 memcpy(ip->de_Name, toname, 11); /* update denode */ 1046 dp->de_fndoffset = to_diroffset; 1047 dp->de_fndcnt = to_count; 1048 error = createde(ip, dp, (struct denode **)0, tcnp); 1049 if (error) { 1050 memcpy(ip->de_Name, oldname, 11); 1051 VOP_UNLOCK(fvp); 1052 goto bad; 1053 } 1054 ip->de_refcnt++; 1055 zp->de_fndoffset = from_diroffset; 1056 if ((error = removede(zp, ip)) != 0) { 1057 /* XXX should really panic here, fs is corrupt */ 1058 VOP_UNLOCK(fvp); 1059 goto bad; 1060 } 1061 cache_purge(fvp); 1062 if (!doingdirectory) { 1063 error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0, 1064 &ip->de_dirclust, 0); 1065 if (error) { 1066 /* XXX should really panic here, fs is corrupt */ 1067 VOP_UNLOCK(fvp); 1068 goto bad; 1069 } 1070 ip->de_diroffset = to_diroffset; 1071 if (ip->de_dirclust != MSDOSFSROOT) 1072 ip->de_diroffset &= pmp->pm_crbomask; 1073 } 1074 reinsert(ip); 1075 } 1076 1077 /* 1078 * If we moved a directory to a new parent directory, then we must 1079 * fixup the ".." entry in the moved directory. 1080 */ 1081 if (doingdirectory && newparent) { 1082 cn = ip->de_StartCluster; 1083 if (cn == MSDOSFSROOT) { 1084 /* this should never happen */ 1085 panic("msdosfs_rename: updating .. in root directory?"); 1086 } else 1087 bn = cntobn(pmp, cn); 1088 error = bread(pmp->pm_devvp, de_bn2kb(pmp, bn), 1089 pmp->pm_bpcluster, NOCRED, B_MODIFY, &bp); 1090 if (error) { 1091 /* XXX should really panic here, fs is corrupt */ 1092 brelse(bp, 0); 1093 VOP_UNLOCK(fvp); 1094 goto bad; 1095 } 1096 dotdotp = (struct direntry *)bp->b_data + 1; 1097 putushort(dotdotp->deStartCluster, dp->de_StartCluster); 1098 if (FAT32(pmp)) { 1099 putushort(dotdotp->deHighClust, 1100 dp->de_StartCluster >> 16); 1101 } else { 1102 putushort(dotdotp->deHighClust, 0); 1103 } 1104 if ((error = bwrite(bp)) != 0) { 1105 /* XXX should really panic here, fs is corrupt */ 1106 VOP_UNLOCK(fvp); 1107 goto bad; 1108 } 1109 } 1110 1111 VN_KNOTE(fvp, NOTE_RENAME); 1112 VOP_UNLOCK(fvp); 1113 bad: 1114 if (tvp) 1115 vput(tvp); 1116 vrele(tdvp); 1117 out: 1118 ip->de_flag &= ~DE_RENAME; 1119 vrele(fdvp); 1120 vrele(fvp); 1121 fstrans_done(fdvp->v_mount); 1122 return (error); 1123 1124 /* XXX: uuuh */ 1125 tdvpbad: 1126 VOP_UNLOCK(tdvp); 1127 goto bad; 1128 } 1129 1130 static const struct { 1131 struct direntry dot; 1132 struct direntry dotdot; 1133 } dosdirtemplate = { 1134 { ". ", " ", /* the . entry */ 1135 ATTR_DIRECTORY, /* file attribute */ 1136 0, /* reserved */ 1137 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1138 { 0, 0 }, /* access date */ 1139 { 0, 0 }, /* high bits of start cluster */ 1140 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1141 { 0, 0 }, /* startcluster */ 1142 { 0, 0, 0, 0 } /* filesize */ 1143 }, 1144 { ".. ", " ", /* the .. entry */ 1145 ATTR_DIRECTORY, /* file attribute */ 1146 0, /* reserved */ 1147 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1148 { 0, 0 }, /* access date */ 1149 { 0, 0 }, /* high bits of start cluster */ 1150 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1151 { 0, 0 }, /* startcluster */ 1152 { 0, 0, 0, 0 } /* filesize */ 1153 } 1154 }; 1155 1156 int 1157 msdosfs_mkdir(void *v) 1158 { 1159 struct vop_mkdir_args /* { 1160 struct vnode *a_dvp; 1161 struvt vnode **a_vpp; 1162 struvt componentname *a_cnp; 1163 struct vattr *a_vap; 1164 } */ *ap = v; 1165 struct componentname *cnp = ap->a_cnp; 1166 struct denode ndirent; 1167 struct denode *dep; 1168 struct denode *pdep = VTODE(ap->a_dvp); 1169 int error; 1170 int bn; 1171 u_long newcluster, pcl; 1172 daddr_t lbn; 1173 struct direntry *denp; 1174 struct msdosfsmount *pmp = pdep->de_pmp; 1175 struct buf *bp; 1176 int async = pdep->de_pmp->pm_mountp->mnt_flag & MNT_ASYNC; 1177 1178 fstrans_start(ap->a_dvp->v_mount, FSTRANS_SHARED); 1179 /* 1180 * If this is the root directory and there is no space left we 1181 * can't do anything. This is because the root directory can not 1182 * change size. 1183 */ 1184 if (pdep->de_StartCluster == MSDOSFSROOT 1185 && pdep->de_fndoffset >= pdep->de_FileSize) { 1186 error = ENOSPC; 1187 goto bad2; 1188 } 1189 1190 /* 1191 * Allocate a cluster to hold the about to be created directory. 1192 */ 1193 error = clusteralloc(pmp, 0, 1, &newcluster, NULL); 1194 if (error) 1195 goto bad2; 1196 1197 memset(&ndirent, 0, sizeof(ndirent)); 1198 ndirent.de_pmp = pmp; 1199 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 1200 DETIMES(&ndirent, NULL, NULL, NULL, pmp->pm_gmtoff); 1201 1202 /* 1203 * Now fill the cluster with the "." and ".." entries. And write 1204 * the cluster to disk. This way it is there for the parent 1205 * directory to be pointing at if there were a crash. 1206 */ 1207 bn = cntobn(pmp, newcluster); 1208 lbn = de_bn2kb(pmp, bn); 1209 /* always succeeds */ 1210 bp = getblk(pmp->pm_devvp, lbn, pmp->pm_bpcluster, 0, 0); 1211 memset(bp->b_data, 0, pmp->pm_bpcluster); 1212 memcpy(bp->b_data, &dosdirtemplate, sizeof dosdirtemplate); 1213 denp = (struct direntry *)bp->b_data; 1214 putushort(denp[0].deStartCluster, newcluster); 1215 putushort(denp[0].deCDate, ndirent.de_CDate); 1216 putushort(denp[0].deCTime, ndirent.de_CTime); 1217 denp[0].deCHundredth = ndirent.de_CHun; 1218 putushort(denp[0].deADate, ndirent.de_ADate); 1219 putushort(denp[0].deMDate, ndirent.de_MDate); 1220 putushort(denp[0].deMTime, ndirent.de_MTime); 1221 pcl = pdep->de_StartCluster; 1222 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1223 pcl = 0; 1224 putushort(denp[1].deStartCluster, pcl); 1225 putushort(denp[1].deCDate, ndirent.de_CDate); 1226 putushort(denp[1].deCTime, ndirent.de_CTime); 1227 denp[1].deCHundredth = ndirent.de_CHun; 1228 putushort(denp[1].deADate, ndirent.de_ADate); 1229 putushort(denp[1].deMDate, ndirent.de_MDate); 1230 putushort(denp[1].deMTime, ndirent.de_MTime); 1231 if (FAT32(pmp)) { 1232 putushort(denp[0].deHighClust, newcluster >> 16); 1233 putushort(denp[1].deHighClust, pdep->de_StartCluster >> 16); 1234 } else { 1235 putushort(denp[0].deHighClust, 0); 1236 putushort(denp[1].deHighClust, 0); 1237 } 1238 1239 if (async) 1240 bdwrite(bp); 1241 else if ((error = bwrite(bp)) != 0) 1242 goto bad; 1243 1244 /* 1245 * Now build up a directory entry pointing to the newly allocated 1246 * cluster. This will be written to an empty slot in the parent 1247 * directory. 1248 */ 1249 if ((error = uniqdosname(pdep, cnp, ndirent.de_Name)) != 0) 1250 goto bad; 1251 1252 ndirent.de_Attributes = ATTR_DIRECTORY; 1253 ndirent.de_StartCluster = newcluster; 1254 ndirent.de_FileSize = 0; 1255 ndirent.de_dev = pdep->de_dev; 1256 ndirent.de_devvp = pdep->de_devvp; 1257 if ((error = createde(&ndirent, pdep, &dep, cnp)) != 0) 1258 goto bad; 1259 VN_KNOTE(ap->a_dvp, NOTE_WRITE | NOTE_LINK); 1260 vput(ap->a_dvp); 1261 *ap->a_vpp = DETOV(dep); 1262 fstrans_done(ap->a_dvp->v_mount); 1263 return (0); 1264 1265 bad: 1266 clusterfree(pmp, newcluster, NULL); 1267 bad2: 1268 vput(ap->a_dvp); 1269 fstrans_done(ap->a_dvp->v_mount); 1270 return (error); 1271 } 1272 1273 int 1274 msdosfs_rmdir(void *v) 1275 { 1276 struct vop_rmdir_args /* { 1277 struct vnode *a_dvp; 1278 struct vnode *a_vp; 1279 struct componentname *a_cnp; 1280 } */ *ap = v; 1281 struct vnode *vp = ap->a_vp; 1282 struct vnode *dvp = ap->a_dvp; 1283 struct componentname *cnp = ap->a_cnp; 1284 struct denode *ip, *dp; 1285 int error; 1286 1287 ip = VTODE(vp); 1288 dp = VTODE(dvp); 1289 /* 1290 * No rmdir "." please. 1291 */ 1292 if (dp == ip) { 1293 vrele(dvp); 1294 vput(vp); 1295 return (EINVAL); 1296 } 1297 fstrans_start(ap->a_dvp->v_mount, FSTRANS_SHARED); 1298 /* 1299 * Verify the directory is empty (and valid). 1300 * (Rmdir ".." won't be valid since 1301 * ".." will contain a reference to 1302 * the current directory and thus be 1303 * non-empty.) 1304 */ 1305 error = 0; 1306 if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) { 1307 error = ENOTEMPTY; 1308 goto out; 1309 } 1310 /* 1311 * Delete the entry from the directory. For dos filesystems this 1312 * gets rid of the directory entry on disk, the in memory copy 1313 * still exists but the de_refcnt is <= 0. This prevents it from 1314 * being found by deget(). When the vput() on dep is done we give 1315 * up access and eventually msdosfs_reclaim() will be called which 1316 * will remove it from the denode cache. 1317 */ 1318 if ((error = removede(dp, ip)) != 0) 1319 goto out; 1320 /* 1321 * This is where we decrement the link count in the parent 1322 * directory. Since dos filesystems don't do this we just purge 1323 * the name cache and let go of the parent directory denode. 1324 */ 1325 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 1326 cache_purge(dvp); 1327 vput(dvp); 1328 dvp = NULL; 1329 /* 1330 * Truncate the directory that is being deleted. 1331 */ 1332 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred); 1333 cache_purge(vp); 1334 out: 1335 VN_KNOTE(vp, NOTE_DELETE); 1336 if (dvp) 1337 vput(dvp); 1338 vput(vp); 1339 fstrans_done(ap->a_dvp->v_mount); 1340 return (error); 1341 } 1342 1343 int 1344 msdosfs_readdir(void *v) 1345 { 1346 struct vop_readdir_args /* { 1347 struct vnode *a_vp; 1348 struct uio *a_uio; 1349 kauth_cred_t a_cred; 1350 int *a_eofflag; 1351 off_t **a_cookies; 1352 int *a_ncookies; 1353 } */ *ap = v; 1354 int error = 0; 1355 int diff; 1356 long n; 1357 int blsize; 1358 long on; 1359 long lost; 1360 long count; 1361 u_long cn; 1362 ino_t fileno; 1363 u_long dirsperblk; 1364 long bias = 0; 1365 daddr_t bn, lbn; 1366 struct buf *bp; 1367 struct denode *dep = VTODE(ap->a_vp); 1368 struct msdosfsmount *pmp = dep->de_pmp; 1369 struct direntry *dentp; 1370 struct dirent *dirbuf; 1371 struct uio *uio = ap->a_uio; 1372 off_t *cookies = NULL; 1373 int ncookies = 0, nc = 0; 1374 off_t offset, uio_off; 1375 int chksum = -1; 1376 1377 #ifdef MSDOSFS_DEBUG 1378 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n", 1379 ap->a_vp, uio, ap->a_cred, ap->a_eofflag); 1380 #endif 1381 1382 /* 1383 * msdosfs_readdir() won't operate properly on regular files since 1384 * it does i/o only with the filesystem vnode, and hence can 1385 * retrieve the wrong block from the buffer cache for a plain file. 1386 * So, fail attempts to readdir() on a plain file. 1387 */ 1388 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) 1389 return (ENOTDIR); 1390 1391 /* 1392 * If the user buffer is smaller than the size of one dos directory 1393 * entry or the file offset is not a multiple of the size of a 1394 * directory entry, then we fail the read. 1395 */ 1396 count = uio->uio_resid & ~(sizeof(struct direntry) - 1); 1397 offset = uio->uio_offset; 1398 if (count < sizeof(struct direntry) || 1399 (offset & (sizeof(struct direntry) - 1))) 1400 return (EINVAL); 1401 lost = uio->uio_resid - count; 1402 uio->uio_resid = count; 1403 uio_off = uio->uio_offset; 1404 1405 fstrans_start(ap->a_vp->v_mount, FSTRANS_SHARED); 1406 1407 /* Allocate a temporary dirent buffer. */ 1408 dirbuf = malloc(sizeof(struct dirent), M_MSDOSFSTMP, M_WAITOK | M_ZERO); 1409 1410 if (ap->a_ncookies) { 1411 nc = uio->uio_resid / _DIRENT_MINSIZE((struct dirent *)0); 1412 cookies = malloc(nc * sizeof (off_t), M_TEMP, M_WAITOK); 1413 *ap->a_cookies = cookies; 1414 } 1415 1416 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 1417 1418 /* 1419 * If they are reading from the root directory then, we simulate 1420 * the . and .. entries since these don't exist in the root 1421 * directory. We also set the offset bias to make up for having to 1422 * simulate these entries. By this I mean that at file offset 64 we 1423 * read the first entry in the root directory that lives on disk. 1424 */ 1425 if (dep->de_StartCluster == MSDOSFSROOT 1426 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) { 1427 #if 0 1428 printf("msdosfs_readdir(): going after . or .. in root dir, " 1429 "offset %" PRIu64 "\n", offset); 1430 #endif 1431 bias = 2 * sizeof(struct direntry); 1432 if (offset < bias) { 1433 for (n = (int)offset / sizeof(struct direntry); 1434 n < 2; n++) { 1435 if (FAT32(pmp)) 1436 dirbuf->d_fileno = cntobn(pmp, 1437 (ino_t)pmp->pm_rootdirblk) 1438 * dirsperblk; 1439 else 1440 dirbuf->d_fileno = 1; 1441 dirbuf->d_type = DT_DIR; 1442 switch (n) { 1443 case 0: 1444 dirbuf->d_namlen = 1; 1445 strlcpy(dirbuf->d_name, ".", 1446 sizeof(dirbuf->d_name)); 1447 break; 1448 case 1: 1449 dirbuf->d_namlen = 2; 1450 strlcpy(dirbuf->d_name, "..", 1451 sizeof(dirbuf->d_name)); 1452 break; 1453 } 1454 dirbuf->d_reclen = _DIRENT_SIZE(dirbuf); 1455 if (uio->uio_resid < dirbuf->d_reclen) 1456 goto out; 1457 error = uiomove(dirbuf, dirbuf->d_reclen, uio); 1458 if (error) 1459 goto out; 1460 offset += sizeof(struct direntry); 1461 uio_off = offset; 1462 if (cookies) { 1463 *cookies++ = offset; 1464 ncookies++; 1465 if (ncookies >= nc) 1466 goto out; 1467 } 1468 } 1469 } 1470 } 1471 1472 while (uio->uio_resid > 0) { 1473 lbn = de_cluster(pmp, offset - bias); 1474 on = (offset - bias) & pmp->pm_crbomask; 1475 n = MIN(pmp->pm_bpcluster - on, uio->uio_resid); 1476 diff = dep->de_FileSize - (offset - bias); 1477 if (diff <= 0) 1478 break; 1479 n = MIN(n, diff); 1480 if ((error = pcbmap(dep, lbn, &bn, &cn, &blsize)) != 0) 1481 break; 1482 error = bread(pmp->pm_devvp, de_bn2kb(pmp, bn), blsize, 1483 NOCRED, 0, &bp); 1484 if (error) { 1485 brelse(bp, 0); 1486 goto bad; 1487 } 1488 n = MIN(n, blsize - bp->b_resid); 1489 1490 /* 1491 * Convert from dos directory entries to fs-independent 1492 * directory entries. 1493 */ 1494 for (dentp = (struct direntry *)((char *)bp->b_data + on); 1495 (char *)dentp < (char *)bp->b_data + on + n; 1496 dentp++, offset += sizeof(struct direntry)) { 1497 #if 0 1498 1499 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n", 1500 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes); 1501 #endif 1502 /* 1503 * If this is an unused entry, we can stop. 1504 */ 1505 if (dentp->deName[0] == SLOT_EMPTY) { 1506 brelse(bp, 0); 1507 goto out; 1508 } 1509 /* 1510 * Skip deleted entries. 1511 */ 1512 if (dentp->deName[0] == SLOT_DELETED) { 1513 chksum = -1; 1514 continue; 1515 } 1516 1517 /* 1518 * Handle Win95 long directory entries 1519 */ 1520 if (dentp->deAttributes == ATTR_WIN95) { 1521 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) 1522 continue; 1523 chksum = win2unixfn((struct winentry *)dentp, 1524 dirbuf, chksum); 1525 continue; 1526 } 1527 1528 /* 1529 * Skip volume labels 1530 */ 1531 if (dentp->deAttributes & ATTR_VOLUME) { 1532 chksum = -1; 1533 continue; 1534 } 1535 /* 1536 * This computation of d_fileno must match 1537 * the computation of va_fileid in 1538 * msdosfs_getattr. 1539 */ 1540 if (dentp->deAttributes & ATTR_DIRECTORY) { 1541 fileno = getushort(dentp->deStartCluster); 1542 if (FAT32(pmp)) 1543 fileno |= ((ino_t)getushort(dentp->deHighClust)) << 16; 1544 /* if this is the root directory */ 1545 if (fileno == MSDOSFSROOT) 1546 if (FAT32(pmp)) 1547 fileno = cntobn(pmp, 1548 (ino_t)pmp->pm_rootdirblk) 1549 * dirsperblk; 1550 else 1551 fileno = 1; 1552 else 1553 fileno = cntobn(pmp, fileno) * dirsperblk; 1554 dirbuf->d_fileno = fileno; 1555 dirbuf->d_type = DT_DIR; 1556 } else { 1557 dirbuf->d_fileno = 1558 offset / sizeof(struct direntry); 1559 dirbuf->d_type = DT_REG; 1560 } 1561 if (chksum != winChksum(dentp->deName)) 1562 dirbuf->d_namlen = dos2unixfn(dentp->deName, 1563 (u_char *)dirbuf->d_name, 1564 pmp->pm_flags & MSDOSFSMNT_SHORTNAME); 1565 else 1566 dirbuf->d_name[dirbuf->d_namlen] = 0; 1567 chksum = -1; 1568 dirbuf->d_reclen = _DIRENT_SIZE(dirbuf); 1569 if (uio->uio_resid < dirbuf->d_reclen) { 1570 brelse(bp, 0); 1571 goto out; 1572 } 1573 error = uiomove(dirbuf, dirbuf->d_reclen, uio); 1574 if (error) { 1575 brelse(bp, 0); 1576 goto out; 1577 } 1578 uio_off = offset + sizeof(struct direntry); 1579 if (cookies) { 1580 *cookies++ = offset + sizeof(struct direntry); 1581 ncookies++; 1582 if (ncookies >= nc) { 1583 brelse(bp, 0); 1584 goto out; 1585 } 1586 } 1587 } 1588 brelse(bp, 0); 1589 } 1590 1591 out: 1592 uio->uio_offset = uio_off; 1593 uio->uio_resid += lost; 1594 if (dep->de_FileSize - (offset - bias) <= 0) 1595 *ap->a_eofflag = 1; 1596 else 1597 *ap->a_eofflag = 0; 1598 1599 if (ap->a_ncookies) { 1600 if (error) { 1601 free(*ap->a_cookies, M_TEMP); 1602 *ap->a_ncookies = 0; 1603 *ap->a_cookies = NULL; 1604 } else 1605 *ap->a_ncookies = ncookies; 1606 } 1607 1608 bad: 1609 free(dirbuf, M_MSDOSFSTMP); 1610 fstrans_done(ap->a_vp->v_mount); 1611 return (error); 1612 } 1613 1614 /* 1615 * vp - address of vnode file the file 1616 * bn - which cluster we are interested in mapping to a filesystem block number. 1617 * vpp - returns the vnode for the block special file holding the filesystem 1618 * containing the file of interest 1619 * bnp - address of where to return the filesystem relative block number 1620 */ 1621 int 1622 msdosfs_bmap(void *v) 1623 { 1624 struct vop_bmap_args /* { 1625 struct vnode *a_vp; 1626 daddr_t a_bn; 1627 struct vnode **a_vpp; 1628 daddr_t *a_bnp; 1629 int *a_runp; 1630 } */ *ap = v; 1631 struct denode *dep = VTODE(ap->a_vp); 1632 int run, maxrun; 1633 daddr_t runbn; 1634 int status; 1635 1636 if (ap->a_vpp != NULL) 1637 *ap->a_vpp = dep->de_devvp; 1638 if (ap->a_bnp == NULL) 1639 return (0); 1640 status = pcbmap(dep, ap->a_bn, ap->a_bnp, 0, 0); 1641 1642 /* 1643 * From FreeBSD: 1644 * A little kludgy, but we loop calling pcbmap until we 1645 * reach the end of the contiguous piece, or reach MAXPHYS. 1646 * Since it reduces disk I/Os, the "wasted" CPU is put to 1647 * good use (4 to 5 fold sequential read I/O improvement on USB 1648 * drives). 1649 */ 1650 if (ap->a_runp != NULL) { 1651 /* taken from ufs_bmap */ 1652 maxrun = ulmin(MAXPHYS / dep->de_pmp->pm_bpcluster - 1, 1653 dep->de_pmp->pm_maxcluster - ap->a_bn); 1654 for (run = 1; run <= maxrun; run++) { 1655 if (pcbmap(dep, ap->a_bn + run, &runbn, NULL, NULL) 1656 != 0 || runbn != 1657 *ap->a_bnp + de_cn2bn(dep->de_pmp, run)) 1658 break; 1659 } 1660 *ap->a_runp = run - 1; 1661 } 1662 1663 /* 1664 * We need to scale *ap->a_bnp by sector_size/DEV_BSIZE 1665 */ 1666 *ap->a_bnp = de_bn2kb(dep->de_pmp, *ap->a_bnp); 1667 return status; 1668 } 1669 1670 int 1671 msdosfs_strategy(void *v) 1672 { 1673 struct vop_strategy_args /* { 1674 struct vnode *a_vp; 1675 struct buf *a_bp; 1676 } */ *ap = v; 1677 struct vnode *vp = ap->a_vp; 1678 struct buf *bp = ap->a_bp; 1679 struct denode *dep = VTODE(bp->b_vp); 1680 int error = 0; 1681 1682 if (vp->v_type == VBLK || vp->v_type == VCHR) 1683 panic("msdosfs_strategy: spec"); 1684 /* 1685 * If we don't already know the filesystem relative block number 1686 * then get it using pcbmap(). If pcbmap() returns the block 1687 * number as -1 then we've got a hole in the file. DOS filesystems 1688 * don't allow files with holes, so we shouldn't ever see this. 1689 */ 1690 if (bp->b_blkno == bp->b_lblkno) { 1691 error = pcbmap(dep, de_bn2cn(dep->de_pmp, bp->b_lblkno), 1692 &bp->b_blkno, 0, 0); 1693 if (error) 1694 bp->b_blkno = -1; 1695 if (bp->b_blkno == -1) 1696 clrbuf(bp); 1697 else 1698 bp->b_blkno = de_bn2kb(dep->de_pmp, bp->b_blkno); 1699 } 1700 if (bp->b_blkno == -1) { 1701 biodone(bp); 1702 return (error); 1703 } 1704 1705 /* 1706 * Read/write the block from/to the disk that contains the desired 1707 * file block. 1708 */ 1709 1710 vp = dep->de_devvp; 1711 return (VOP_STRATEGY(vp, bp)); 1712 } 1713 1714 int 1715 msdosfs_print(void *v) 1716 { 1717 struct vop_print_args /* { 1718 struct vnode *vp; 1719 } */ *ap = v; 1720 struct denode *dep = VTODE(ap->a_vp); 1721 1722 printf( 1723 "tag VT_MSDOSFS, startcluster %ld, dircluster %ld, diroffset %ld ", 1724 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset); 1725 printf(" dev %llu, %llu ", (unsigned long long)major(dep->de_dev), 1726 (unsigned long long)minor(dep->de_dev)); 1727 printf("\n"); 1728 return (0); 1729 } 1730 1731 int 1732 msdosfs_advlock(void *v) 1733 { 1734 struct vop_advlock_args /* { 1735 struct vnode *a_vp; 1736 void *a_id; 1737 int a_op; 1738 struct flock *a_fl; 1739 int a_flags; 1740 } */ *ap = v; 1741 struct denode *dep = VTODE(ap->a_vp); 1742 1743 return lf_advlock(ap, &dep->de_lockf, dep->de_FileSize); 1744 } 1745 1746 int 1747 msdosfs_pathconf(void *v) 1748 { 1749 struct vop_pathconf_args /* { 1750 struct vnode *a_vp; 1751 int a_name; 1752 register_t *a_retval; 1753 } */ *ap = v; 1754 1755 switch (ap->a_name) { 1756 case _PC_LINK_MAX: 1757 *ap->a_retval = 1; 1758 return (0); 1759 case _PC_NAME_MAX: 1760 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_namemax; 1761 return (0); 1762 case _PC_PATH_MAX: 1763 *ap->a_retval = PATH_MAX; 1764 return (0); 1765 case _PC_CHOWN_RESTRICTED: 1766 *ap->a_retval = 1; 1767 return (0); 1768 case _PC_NO_TRUNC: 1769 *ap->a_retval = 0; 1770 return (0); 1771 case _PC_SYNC_IO: 1772 *ap->a_retval = 1; 1773 return (0); 1774 case _PC_FILESIZEBITS: 1775 *ap->a_retval = 32; 1776 return (0); 1777 default: 1778 return (EINVAL); 1779 } 1780 /* NOTREACHED */ 1781 } 1782 1783 int 1784 msdosfs_fsync(void *v) 1785 { 1786 struct vop_fsync_args /* { 1787 struct vnode *a_vp; 1788 kauth_cred_t a_cred; 1789 int a_flags; 1790 off_t offlo; 1791 off_t offhi; 1792 } */ *ap = v; 1793 struct vnode *vp = ap->a_vp; 1794 int wait; 1795 int error; 1796 1797 fstrans_start(vp->v_mount, FSTRANS_LAZY); 1798 wait = (ap->a_flags & FSYNC_WAIT) != 0; 1799 vflushbuf(vp, wait); 1800 if ((ap->a_flags & FSYNC_DATAONLY) != 0) 1801 error = 0; 1802 else 1803 error = msdosfs_update(vp, NULL, NULL, wait ? UPDATE_WAIT : 0); 1804 1805 if (error == 0 && ap->a_flags & FSYNC_CACHE) { 1806 struct denode *dep = VTODE(vp); 1807 struct vnode *devvp = dep->de_devvp; 1808 1809 int l = 0; 1810 error = VOP_IOCTL(devvp, DIOCCACHESYNC, &l, FWRITE, 1811 curlwp->l_cred); 1812 } 1813 fstrans_done(vp->v_mount); 1814 1815 return (error); 1816 } 1817 1818 void 1819 msdosfs_detimes(struct denode *dep, const struct timespec *acc, 1820 const struct timespec *mod, const struct timespec *cre, int gmtoff) 1821 { 1822 struct timespec *ts = NULL, tsb; 1823 1824 KASSERT(dep->de_flag & (DE_UPDATE | DE_CREATE | DE_ACCESS)); 1825 /* XXX just call getnanotime early and use result if needed? */ 1826 dep->de_flag |= DE_MODIFIED; 1827 if (dep->de_flag & DE_UPDATE) { 1828 if (mod == NULL) { 1829 getnanotime(&tsb); 1830 mod = ts = &tsb; 1831 } 1832 unix2dostime(mod, gmtoff, &dep->de_MDate, &dep->de_MTime, NULL); 1833 dep->de_Attributes |= ATTR_ARCHIVE; 1834 } 1835 if ((dep->de_pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0) { 1836 if (dep->de_flag & DE_ACCESS) { 1837 if (acc == NULL) 1838 acc = ts == NULL ? 1839 (getnanotime(&tsb), ts = &tsb) : ts; 1840 unix2dostime(acc, gmtoff, &dep->de_ADate, NULL, NULL); 1841 } 1842 if (dep->de_flag & DE_CREATE) { 1843 if (cre == NULL) 1844 cre = ts == NULL ? 1845 (getnanotime(&tsb), ts = &tsb) : ts; 1846 unix2dostime(cre, gmtoff, &dep->de_CDate, 1847 &dep->de_CTime, &dep->de_CHun); 1848 } 1849 } 1850 1851 dep->de_flag &= ~(DE_UPDATE | DE_CREATE | DE_ACCESS); 1852 } 1853 1854 /* Global vfs data structures for msdosfs */ 1855 int (**msdosfs_vnodeop_p)(void *); 1856 const struct vnodeopv_entry_desc msdosfs_vnodeop_entries[] = { 1857 { &vop_default_desc, vn_default_error }, 1858 { &vop_lookup_desc, msdosfs_lookup }, /* lookup */ 1859 { &vop_create_desc, msdosfs_create }, /* create */ 1860 { &vop_mknod_desc, genfs_eopnotsupp }, /* mknod */ 1861 { &vop_open_desc, genfs_nullop }, /* open */ 1862 { &vop_close_desc, msdosfs_close }, /* close */ 1863 { &vop_access_desc, msdosfs_access }, /* access */ 1864 { &vop_getattr_desc, msdosfs_getattr }, /* getattr */ 1865 { &vop_setattr_desc, msdosfs_setattr }, /* setattr */ 1866 { &vop_read_desc, msdosfs_read }, /* read */ 1867 { &vop_write_desc, msdosfs_write }, /* write */ 1868 { &vop_fcntl_desc, genfs_fcntl }, /* fcntl */ 1869 { &vop_ioctl_desc, msdosfs_ioctl }, /* ioctl */ 1870 { &vop_poll_desc, msdosfs_poll }, /* poll */ 1871 { &vop_kqfilter_desc, genfs_kqfilter }, /* kqfilter */ 1872 { &vop_revoke_desc, msdosfs_revoke }, /* revoke */ 1873 { &vop_mmap_desc, msdosfs_mmap }, /* mmap */ 1874 { &vop_fsync_desc, msdosfs_fsync }, /* fsync */ 1875 { &vop_seek_desc, msdosfs_seek }, /* seek */ 1876 { &vop_remove_desc, msdosfs_remove }, /* remove */ 1877 { &vop_link_desc, genfs_eopnotsupp }, /* link */ 1878 { &vop_rename_desc, msdosfs_rename }, /* rename */ 1879 { &vop_mkdir_desc, msdosfs_mkdir }, /* mkdir */ 1880 { &vop_rmdir_desc, msdosfs_rmdir }, /* rmdir */ 1881 { &vop_symlink_desc, genfs_eopnotsupp }, /* symlink */ 1882 { &vop_readdir_desc, msdosfs_readdir }, /* readdir */ 1883 { &vop_readlink_desc, genfs_einval }, /* readlink */ 1884 { &vop_abortop_desc, msdosfs_abortop }, /* abortop */ 1885 { &vop_inactive_desc, msdosfs_inactive }, /* inactive */ 1886 { &vop_reclaim_desc, msdosfs_reclaim }, /* reclaim */ 1887 { &vop_lock_desc, genfs_lock }, /* lock */ 1888 { &vop_unlock_desc, genfs_unlock }, /* unlock */ 1889 { &vop_bmap_desc, msdosfs_bmap }, /* bmap */ 1890 { &vop_strategy_desc, msdosfs_strategy }, /* strategy */ 1891 { &vop_print_desc, msdosfs_print }, /* print */ 1892 { &vop_islocked_desc, genfs_islocked }, /* islocked */ 1893 { &vop_pathconf_desc, msdosfs_pathconf }, /* pathconf */ 1894 { &vop_advlock_desc, msdosfs_advlock }, /* advlock */ 1895 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 1896 { &vop_getpages_desc, genfs_getpages }, /* getpages */ 1897 { &vop_putpages_desc, genfs_putpages }, /* putpages */ 1898 { NULL, NULL } 1899 }; 1900 const struct vnodeopv_desc msdosfs_vnodeop_opv_desc = 1901 { &msdosfs_vnodeop_p, msdosfs_vnodeop_entries }; 1902