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sys/fs/msdosfs/msdosfs_vnops.c
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1 /* $FreeBSD$ */ 2 /* $NetBSD: msdosfs_vnops.c,v 1.68 1998/02/10 14:10:04 mrg Exp $ */ 3 4 /*- 5 * SPDX-License-Identifier: BSD-4-Clause 6 * 7 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. 8 * Copyright (C) 1994, 1995, 1997 TooLs GmbH. 9 * All rights reserved. 10 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by TooLs GmbH. 23 * 4. The name of TooLs GmbH may not be used to endorse or promote products 24 * derived from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 27 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 28 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 29 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 31 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 32 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 33 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 34 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 35 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 36 */ 37 /*- 38 * Written by Paul Popelka (paulp@uts.amdahl.com) 39 * 40 * You can do anything you want with this software, just don't say you wrote 41 * it, and don't remove this notice. 42 * 43 * This software is provided "as is". 44 * 45 * The author supplies this software to be publicly redistributed on the 46 * understanding that the author is not responsible for the correct 47 * functioning of this software in any circumstances and is not liable for 48 * any damages caused by this software. 49 * 50 * October 1992 51 */ 52 53 #include <sys/param.h> 54 #include <sys/systm.h> 55 #include <sys/bio.h> 56 #include <sys/buf.h> 57 #include <sys/clock.h> 58 #include <sys/dirent.h> 59 #include <sys/lock.h> 60 #include <sys/lockf.h> 61 #include <sys/malloc.h> 62 #include <sys/mount.h> 63 #include <sys/mutex.h> 64 #include <sys/namei.h> 65 #include <sys/priv.h> 66 #include <sys/stat.h> 67 #include <sys/sysctl.h> 68 #include <sys/unistd.h> 69 #include <sys/vmmeter.h> 70 #include <sys/vnode.h> 71 72 #include <vm/vm.h> 73 #include <vm/vm_extern.h> 74 #include <vm/vnode_pager.h> 75 76 #include <fs/msdosfs/bpb.h> 77 #include <fs/msdosfs/direntry.h> 78 #include <fs/msdosfs/denode.h> 79 #include <fs/msdosfs/fat.h> 80 #include <fs/msdosfs/msdosfsmount.h> 81 82 /* 83 * Prototypes for MSDOSFS vnode operations 84 */ 85 static vop_create_t msdosfs_create; 86 static vop_mknod_t msdosfs_mknod; 87 static vop_open_t msdosfs_open; 88 static vop_close_t msdosfs_close; 89 static vop_access_t msdosfs_access; 90 static vop_getattr_t msdosfs_getattr; 91 static vop_setattr_t msdosfs_setattr; 92 static vop_read_t msdosfs_read; 93 static vop_write_t msdosfs_write; 94 static vop_fsync_t msdosfs_fsync; 95 static vop_remove_t msdosfs_remove; 96 static vop_link_t msdosfs_link; 97 static vop_rename_t msdosfs_rename; 98 static vop_mkdir_t msdosfs_mkdir; 99 static vop_rmdir_t msdosfs_rmdir; 100 static vop_symlink_t msdosfs_symlink; 101 static vop_readdir_t msdosfs_readdir; 102 static vop_bmap_t msdosfs_bmap; 103 static vop_getpages_t msdosfs_getpages; 104 static vop_strategy_t msdosfs_strategy; 105 static vop_print_t msdosfs_print; 106 static vop_pathconf_t msdosfs_pathconf; 107 static vop_vptofh_t msdosfs_vptofh; 108 109 /* 110 * Some general notes: 111 * 112 * In the ufs filesystem the inodes, superblocks, and indirect blocks are 113 * read/written using the vnode for the filesystem. Blocks that represent 114 * the contents of a file are read/written using the vnode for the file 115 * (including directories when they are read/written as files). This 116 * presents problems for the dos filesystem because data that should be in 117 * an inode (if dos had them) resides in the directory itself. Since we 118 * must update directory entries without the benefit of having the vnode 119 * for the directory we must use the vnode for the filesystem. This means 120 * that when a directory is actually read/written (via read, write, or 121 * readdir, or seek) we must use the vnode for the filesystem instead of 122 * the vnode for the directory as would happen in ufs. This is to insure we 123 * retrieve the correct block from the buffer cache since the hash value is 124 * based upon the vnode address and the desired block number. 125 */ 126 127 /* 128 * Create a regular file. On entry the directory to contain the file being 129 * created is locked. We must release before we return. We must also free 130 * the pathname buffer pointed at by cnp->cn_pnbuf, always on error, or 131 * only if the SAVESTART bit in cn_flags is clear on success. 132 */ 133 static int 134 msdosfs_create(struct vop_create_args *ap) 135 { 136 struct componentname *cnp = ap->a_cnp; 137 struct denode ndirent; 138 struct denode *dep; 139 struct denode *pdep = VTODE(ap->a_dvp); 140 struct timespec ts; 141 int error; 142 143 #ifdef MSDOSFS_DEBUG 144 printf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap); 145 #endif 146 147 /* 148 * If this is the root directory and there is no space left we 149 * can't do anything. This is because the root directory can not 150 * change size. 151 */ 152 if (pdep->de_StartCluster == MSDOSFSROOT 153 && pdep->de_fndoffset >= pdep->de_FileSize) { 154 error = ENOSPC; 155 goto bad; 156 } 157 158 /* 159 * Create a directory entry for the file, then call createde() to 160 * have it installed. NOTE: DOS files are always executable. We 161 * use the absence of the owner write bit to make the file 162 * readonly. 163 */ 164 #ifdef DIAGNOSTIC 165 if ((cnp->cn_flags & HASBUF) == 0) 166 panic("msdosfs_create: no name"); 167 #endif 168 memset(&ndirent, 0, sizeof(ndirent)); 169 error = uniqdosname(pdep, cnp, ndirent.de_Name); 170 if (error) 171 goto bad; 172 173 ndirent.de_Attributes = ATTR_ARCHIVE; 174 ndirent.de_LowerCase = 0; 175 ndirent.de_StartCluster = 0; 176 ndirent.de_FileSize = 0; 177 ndirent.de_pmp = pdep->de_pmp; 178 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 179 vfs_timestamp(&ts); 180 DETIMES(&ndirent, &ts, &ts, &ts); 181 error = createde(&ndirent, pdep, &dep, cnp); 182 if (error) 183 goto bad; 184 *ap->a_vpp = DETOV(dep); 185 if ((cnp->cn_flags & MAKEENTRY) != 0) 186 cache_enter(ap->a_dvp, *ap->a_vpp, cnp); 187 return (0); 188 189 bad: 190 return (error); 191 } 192 193 static int 194 msdosfs_mknod(struct vop_mknod_args *ap) 195 { 196 197 return (EINVAL); 198 } 199 200 static int 201 msdosfs_open(struct vop_open_args *ap) 202 { 203 struct denode *dep = VTODE(ap->a_vp); 204 vnode_create_vobject(ap->a_vp, dep->de_FileSize, ap->a_td); 205 return 0; 206 } 207 208 static int 209 msdosfs_close(struct vop_close_args *ap) 210 { 211 struct vnode *vp = ap->a_vp; 212 struct denode *dep = VTODE(vp); 213 struct timespec ts; 214 215 VI_LOCK(vp); 216 if (vp->v_usecount > 1) { 217 vfs_timestamp(&ts); 218 DETIMES(dep, &ts, &ts, &ts); 219 } 220 VI_UNLOCK(vp); 221 return 0; 222 } 223 224 static int 225 msdosfs_access(struct vop_access_args *ap) 226 { 227 struct vnode *vp = ap->a_vp; 228 struct denode *dep = VTODE(ap->a_vp); 229 struct msdosfsmount *pmp = dep->de_pmp; 230 mode_t file_mode; 231 accmode_t accmode = ap->a_accmode; 232 233 file_mode = S_IRWXU|S_IRWXG|S_IRWXO; 234 file_mode &= (vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); 235 236 /* 237 * Disallow writing to directories and regular files if the 238 * filesystem is read-only. 239 */ 240 if (accmode & VWRITE) { 241 switch (vp->v_type) { 242 case VREG: 243 case VDIR: 244 if (vp->v_mount->mnt_flag & MNT_RDONLY) 245 return (EROFS); 246 break; 247 default: 248 break; 249 } 250 } 251 252 return (vaccess(vp->v_type, file_mode, pmp->pm_uid, pmp->pm_gid, 253 ap->a_accmode, ap->a_cred)); 254 } 255 256 static int 257 msdosfs_getattr(struct vop_getattr_args *ap) 258 { 259 struct denode *dep = VTODE(ap->a_vp); 260 struct msdosfsmount *pmp = dep->de_pmp; 261 struct vattr *vap = ap->a_vap; 262 mode_t mode; 263 struct timespec ts; 264 u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 265 uint64_t fileid; 266 267 vfs_timestamp(&ts); 268 DETIMES(dep, &ts, &ts, &ts); 269 vap->va_fsid = dev2udev(pmp->pm_dev); 270 /* 271 * The following computation of the fileid must be the same as that 272 * used in msdosfs_readdir() to compute d_fileno. If not, pwd 273 * doesn't work. 274 */ 275 if (dep->de_Attributes & ATTR_DIRECTORY) { 276 fileid = (uint64_t)cntobn(pmp, dep->de_StartCluster) * 277 dirsperblk; 278 if (dep->de_StartCluster == MSDOSFSROOT) 279 fileid = 1; 280 } else { 281 fileid = (uint64_t)cntobn(pmp, dep->de_dirclust) * 282 dirsperblk; 283 if (dep->de_dirclust == MSDOSFSROOT) 284 fileid = (uint64_t)roottobn(pmp, 0) * dirsperblk; 285 fileid += (uoff_t)dep->de_diroffset / sizeof(struct direntry); 286 } 287 vap->va_fileid = fileid; 288 289 mode = S_IRWXU|S_IRWXG|S_IRWXO; 290 if (dep->de_Attributes & ATTR_READONLY) 291 mode &= ~(S_IWUSR|S_IWGRP|S_IWOTH); 292 vap->va_mode = mode & 293 (ap->a_vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); 294 vap->va_uid = pmp->pm_uid; 295 vap->va_gid = pmp->pm_gid; 296 vap->va_nlink = 1; 297 vap->va_rdev = NODEV; 298 vap->va_size = dep->de_FileSize; 299 fattime2timespec(dep->de_MDate, dep->de_MTime, 0, 0, &vap->va_mtime); 300 vap->va_ctime = vap->va_mtime; 301 if (pmp->pm_flags & MSDOSFSMNT_LONGNAME) { 302 fattime2timespec(dep->de_ADate, 0, 0, 0, &vap->va_atime); 303 fattime2timespec(dep->de_CDate, dep->de_CTime, dep->de_CHun, 304 0, &vap->va_birthtime); 305 } else { 306 vap->va_atime = vap->va_mtime; 307 vap->va_birthtime.tv_sec = -1; 308 vap->va_birthtime.tv_nsec = 0; 309 } 310 vap->va_flags = 0; 311 if (dep->de_Attributes & ATTR_ARCHIVE) 312 vap->va_flags |= UF_ARCHIVE; 313 if (dep->de_Attributes & ATTR_HIDDEN) 314 vap->va_flags |= UF_HIDDEN; 315 if (dep->de_Attributes & ATTR_READONLY) 316 vap->va_flags |= UF_READONLY; 317 if (dep->de_Attributes & ATTR_SYSTEM) 318 vap->va_flags |= UF_SYSTEM; 319 vap->va_gen = 0; 320 vap->va_blocksize = pmp->pm_bpcluster; 321 vap->va_bytes = 322 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask; 323 vap->va_type = ap->a_vp->v_type; 324 vap->va_filerev = dep->de_modrev; 325 return (0); 326 } 327 328 static int 329 msdosfs_setattr(struct vop_setattr_args *ap) 330 { 331 struct vnode *vp = ap->a_vp; 332 struct denode *dep = VTODE(ap->a_vp); 333 struct msdosfsmount *pmp = dep->de_pmp; 334 struct vattr *vap = ap->a_vap; 335 struct ucred *cred = ap->a_cred; 336 struct thread *td = curthread; 337 int error = 0; 338 339 #ifdef MSDOSFS_DEBUG 340 printf("msdosfs_setattr(): vp %p, vap %p, cred %p\n", 341 ap->a_vp, vap, cred); 342 #endif 343 344 /* 345 * Check for unsettable attributes. 346 */ 347 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 348 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 349 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 350 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 351 #ifdef MSDOSFS_DEBUG 352 printf("msdosfs_setattr(): returning EINVAL\n"); 353 printf(" va_type %d, va_nlink %llx, va_fsid %llx, va_fileid %llx\n", 354 vap->va_type, (unsigned long long)vap->va_nlink, 355 (unsigned long long)vap->va_fsid, 356 (unsigned long long)vap->va_fileid); 357 printf(" va_blocksize %lx, va_rdev %llx, va_bytes %llx, va_gen %lx\n", 358 vap->va_blocksize, (unsigned long long)vap->va_rdev, 359 (unsigned long long)vap->va_bytes, vap->va_gen); 360 printf(" va_uid %x, va_gid %x\n", 361 vap->va_uid, vap->va_gid); 362 #endif 363 return (EINVAL); 364 } 365 366 /* 367 * We don't allow setting attributes on the root directory. 368 * The special case for the root directory is because before 369 * FAT32, the root directory didn't have an entry for itself 370 * (and was otherwise special). With FAT32, the root 371 * directory is not so special, but still doesn't have an 372 * entry for itself. 373 */ 374 if (vp->v_vflag & VV_ROOT) 375 return (EINVAL); 376 377 if (vap->va_flags != VNOVAL) { 378 if (vp->v_mount->mnt_flag & MNT_RDONLY) 379 return (EROFS); 380 if (cred->cr_uid != pmp->pm_uid) { 381 error = priv_check_cred(cred, PRIV_VFS_ADMIN); 382 if (error) 383 return (error); 384 } 385 /* 386 * We are very inconsistent about handling unsupported 387 * attributes. We ignored the access time and the 388 * read and execute bits. We were strict for the other 389 * attributes. 390 */ 391 if (vap->va_flags & ~(UF_ARCHIVE | UF_HIDDEN | UF_READONLY | 392 UF_SYSTEM)) 393 return EOPNOTSUPP; 394 if (vap->va_flags & UF_ARCHIVE) 395 dep->de_Attributes |= ATTR_ARCHIVE; 396 else 397 dep->de_Attributes &= ~ATTR_ARCHIVE; 398 if (vap->va_flags & UF_HIDDEN) 399 dep->de_Attributes |= ATTR_HIDDEN; 400 else 401 dep->de_Attributes &= ~ATTR_HIDDEN; 402 /* We don't allow changing the readonly bit on directories. */ 403 if (vp->v_type != VDIR) { 404 if (vap->va_flags & UF_READONLY) 405 dep->de_Attributes |= ATTR_READONLY; 406 else 407 dep->de_Attributes &= ~ATTR_READONLY; 408 } 409 if (vap->va_flags & UF_SYSTEM) 410 dep->de_Attributes |= ATTR_SYSTEM; 411 else 412 dep->de_Attributes &= ~ATTR_SYSTEM; 413 dep->de_flag |= DE_MODIFIED; 414 } 415 416 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 417 uid_t uid; 418 gid_t gid; 419 420 if (vp->v_mount->mnt_flag & MNT_RDONLY) 421 return (EROFS); 422 uid = vap->va_uid; 423 if (uid == (uid_t)VNOVAL) 424 uid = pmp->pm_uid; 425 gid = vap->va_gid; 426 if (gid == (gid_t)VNOVAL) 427 gid = pmp->pm_gid; 428 if (cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid || 429 (gid != pmp->pm_gid && !groupmember(gid, cred))) { 430 error = priv_check_cred(cred, PRIV_VFS_CHOWN); 431 if (error) 432 return (error); 433 } 434 if (uid != pmp->pm_uid || gid != pmp->pm_gid) 435 return EINVAL; 436 } 437 438 if (vap->va_size != VNOVAL) { 439 switch (vp->v_type) { 440 case VDIR: 441 return (EISDIR); 442 case VREG: 443 /* 444 * Truncation is only supported for regular files, 445 * Disallow it if the filesystem is read-only. 446 */ 447 if (vp->v_mount->mnt_flag & MNT_RDONLY) 448 return (EROFS); 449 break; 450 default: 451 /* 452 * According to POSIX, the result is unspecified 453 * for file types other than regular files, 454 * directories and shared memory objects. We 455 * don't support any file types except regular 456 * files and directories in this file system, so 457 * this (default) case is unreachable and can do 458 * anything. Keep falling through to detrunc() 459 * for now. 460 */ 461 break; 462 } 463 error = vn_rlimit_trunc(vap->va_size, td); 464 if (error != 0) 465 return (error); 466 error = detrunc(dep, vap->va_size, 0, cred); 467 if (error) 468 return error; 469 } 470 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 471 if (vp->v_mount->mnt_flag & MNT_RDONLY) 472 return (EROFS); 473 error = vn_utimes_perm(vp, vap, cred, td); 474 if (error != 0) 475 return (error); 476 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 && 477 vap->va_atime.tv_sec != VNOVAL) { 478 dep->de_flag &= ~DE_ACCESS; 479 timespec2fattime(&vap->va_atime, 0, 480 &dep->de_ADate, NULL, NULL); 481 } 482 if (vap->va_mtime.tv_sec != VNOVAL) { 483 dep->de_flag &= ~DE_UPDATE; 484 timespec2fattime(&vap->va_mtime, 0, 485 &dep->de_MDate, &dep->de_MTime, NULL); 486 } 487 /* 488 * We don't set the archive bit when modifying the time of 489 * a directory to emulate the Windows/DOS behavior. 490 */ 491 if (vp->v_type != VDIR) 492 dep->de_Attributes |= ATTR_ARCHIVE; 493 dep->de_flag |= DE_MODIFIED; 494 } 495 /* 496 * DOS files only have the ability to have their writability 497 * attribute set, so we use the owner write bit to set the readonly 498 * attribute. 499 */ 500 if (vap->va_mode != (mode_t)VNOVAL) { 501 if (vp->v_mount->mnt_flag & MNT_RDONLY) 502 return (EROFS); 503 if (cred->cr_uid != pmp->pm_uid) { 504 error = priv_check_cred(cred, PRIV_VFS_ADMIN); 505 if (error) 506 return (error); 507 } 508 if (vp->v_type != VDIR) { 509 /* We ignore the read and execute bits. */ 510 if (vap->va_mode & S_IWUSR) 511 dep->de_Attributes &= ~ATTR_READONLY; 512 else 513 dep->de_Attributes |= ATTR_READONLY; 514 dep->de_Attributes |= ATTR_ARCHIVE; 515 dep->de_flag |= DE_MODIFIED; 516 } 517 } 518 return (deupdat(dep, 0)); 519 } 520 521 static int 522 msdosfs_read(struct vop_read_args *ap) 523 { 524 int error = 0; 525 int blsize; 526 int isadir; 527 ssize_t orig_resid; 528 u_int n; 529 u_long diff; 530 u_long on; 531 daddr_t lbn; 532 daddr_t rablock; 533 int rasize; 534 int seqcount; 535 struct buf *bp; 536 struct vnode *vp = ap->a_vp; 537 struct denode *dep = VTODE(vp); 538 struct msdosfsmount *pmp = dep->de_pmp; 539 struct uio *uio = ap->a_uio; 540 541 /* 542 * If they didn't ask for any data, then we are done. 543 */ 544 orig_resid = uio->uio_resid; 545 if (orig_resid == 0) 546 return (0); 547 548 /* 549 * The caller is supposed to ensure that 550 * uio->uio_offset >= 0 and uio->uio_resid >= 0. 551 * We don't need to check for large offsets as in ffs because 552 * dep->de_FileSize <= MSDOSFS_FILESIZE_MAX < OFF_MAX, so large 553 * offsets cannot cause overflow even in theory. 554 */ 555 556 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 557 558 isadir = dep->de_Attributes & ATTR_DIRECTORY; 559 do { 560 if (uio->uio_offset >= dep->de_FileSize) 561 break; 562 lbn = de_cluster(pmp, uio->uio_offset); 563 rablock = lbn + 1; 564 blsize = pmp->pm_bpcluster; 565 on = uio->uio_offset & pmp->pm_crbomask; 566 /* 567 * If we are operating on a directory file then be sure to 568 * do i/o with the vnode for the filesystem instead of the 569 * vnode for the directory. 570 */ 571 if (isadir) { 572 /* convert cluster # to block # */ 573 error = pcbmap(dep, lbn, &lbn, 0, &blsize); 574 if (error == E2BIG) { 575 error = EINVAL; 576 break; 577 } else if (error) 578 break; 579 error = bread(pmp->pm_devvp, lbn, blsize, NOCRED, &bp); 580 } else if (de_cn2off(pmp, rablock) >= dep->de_FileSize) { 581 error = bread(vp, lbn, blsize, NOCRED, &bp); 582 } else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) { 583 error = cluster_read(vp, dep->de_FileSize, lbn, blsize, 584 NOCRED, on + uio->uio_resid, seqcount, 0, &bp); 585 } else if (seqcount > 1) { 586 rasize = blsize; 587 error = breadn(vp, lbn, 588 blsize, &rablock, &rasize, 1, NOCRED, &bp); 589 } else { 590 error = bread(vp, lbn, blsize, NOCRED, &bp); 591 } 592 if (error) { 593 brelse(bp); 594 break; 595 } 596 diff = pmp->pm_bpcluster - on; 597 n = diff > uio->uio_resid ? uio->uio_resid : diff; 598 diff = dep->de_FileSize - uio->uio_offset; 599 if (diff < n) 600 n = diff; 601 diff = blsize - bp->b_resid; 602 if (diff < n) 603 n = diff; 604 error = vn_io_fault_uiomove(bp->b_data + on, (int) n, uio); 605 brelse(bp); 606 } while (error == 0 && uio->uio_resid > 0 && n != 0); 607 if (!isadir && (error == 0 || uio->uio_resid != orig_resid) && 608 (vp->v_mount->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0) 609 dep->de_flag |= DE_ACCESS; 610 return (error); 611 } 612 613 /* 614 * Write data to a file or directory. 615 */ 616 static int 617 msdosfs_write(struct vop_write_args *ap) 618 { 619 int n; 620 int croffset; 621 ssize_t resid, r; 622 u_long osize; 623 int error = 0; 624 u_long count; 625 int seqcount; 626 daddr_t bn, lastcn; 627 struct buf *bp; 628 int ioflag = ap->a_ioflag; 629 struct uio *uio = ap->a_uio; 630 struct vnode *vp = ap->a_vp; 631 struct vnode *thisvp; 632 struct denode *dep = VTODE(vp); 633 struct msdosfsmount *pmp = dep->de_pmp; 634 struct ucred *cred = ap->a_cred; 635 636 #ifdef MSDOSFS_DEBUG 637 printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n", 638 vp, uio, ioflag, cred); 639 printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n", 640 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster); 641 #endif 642 643 switch (vp->v_type) { 644 case VREG: 645 if (ioflag & IO_APPEND) 646 uio->uio_offset = dep->de_FileSize; 647 thisvp = vp; 648 break; 649 case VDIR: 650 return EISDIR; 651 default: 652 panic("msdosfs_write(): bad file type"); 653 } 654 655 /* 656 * This is needed (unlike in ffs_write()) because we extend the 657 * file outside of the loop but we don't want to extend the file 658 * for writes of 0 bytes. 659 */ 660 if (uio->uio_resid == 0) 661 return (0); 662 663 /* 664 * The caller is supposed to ensure that 665 * uio->uio_offset >= 0 and uio->uio_resid >= 0. 666 * 667 * If they've exceeded their filesize limit, tell them about it. 668 */ 669 error = vn_rlimit_fsizex(vp, uio, MSDOSFS_FILESIZE_MAX, &r, 670 uio->uio_td); 671 if (error != 0) { 672 vn_rlimit_fsizex_res(uio, r); 673 return (error); 674 } 675 676 /* 677 * If the offset we are starting the write at is beyond the end of 678 * the file, then they've done a seek. Unix filesystems allow 679 * files with holes in them, DOS doesn't so we must fill the hole 680 * with zeroed blocks. 681 */ 682 if (uio->uio_offset > dep->de_FileSize) { 683 error = deextend(dep, uio->uio_offset, cred); 684 if (error != 0) { 685 vn_rlimit_fsizex_res(uio, r); 686 return (error); 687 } 688 } 689 690 /* 691 * Remember some values in case the write fails. 692 */ 693 resid = uio->uio_resid; 694 osize = dep->de_FileSize; 695 696 /* 697 * If we write beyond the end of the file, extend it to its ultimate 698 * size ahead of the time to hopefully get a contiguous area. 699 */ 700 if (uio->uio_offset + resid > osize) { 701 count = de_clcount(pmp, uio->uio_offset + resid) - 702 de_clcount(pmp, osize); 703 error = extendfile(dep, count, NULL, NULL, 0); 704 if (error && (error != ENOSPC || (ioflag & IO_UNIT))) 705 goto errexit; 706 lastcn = dep->de_fc[FC_LASTFC].fc_frcn; 707 } else 708 lastcn = de_clcount(pmp, osize) - 1; 709 710 seqcount = ioflag >> IO_SEQSHIFT; 711 do { 712 if (de_cluster(pmp, uio->uio_offset) > lastcn) { 713 error = ENOSPC; 714 break; 715 } 716 717 croffset = uio->uio_offset & pmp->pm_crbomask; 718 n = min(uio->uio_resid, pmp->pm_bpcluster - croffset); 719 if (uio->uio_offset + n > dep->de_FileSize) { 720 dep->de_FileSize = uio->uio_offset + n; 721 /* The object size needs to be set before buffer is allocated */ 722 vnode_pager_setsize(vp, dep->de_FileSize); 723 } 724 725 bn = de_cluster(pmp, uio->uio_offset); 726 if ((uio->uio_offset & pmp->pm_crbomask) == 0 727 && (de_cluster(pmp, uio->uio_offset + uio->uio_resid) 728 > de_cluster(pmp, uio->uio_offset) 729 || uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) { 730 /* 731 * If either the whole cluster gets written, 732 * or we write the cluster from its start beyond EOF, 733 * then no need to read data from disk. 734 */ 735 bp = getblk(thisvp, bn, pmp->pm_bpcluster, 0, 0, 0); 736 /* 737 * This call to vfs_bio_clrbuf() ensures that 738 * even if vn_io_fault_uiomove() below faults, 739 * garbage from the newly instantiated buffer 740 * is not exposed to the userspace via mmap(). 741 */ 742 vfs_bio_clrbuf(bp); 743 /* 744 * Do the bmap now, since pcbmap needs buffers 745 * for the FAT table. (see msdosfs_strategy) 746 */ 747 if (bp->b_blkno == bp->b_lblkno) { 748 error = pcbmap(dep, bp->b_lblkno, &bn, 0, 0); 749 if (error) 750 bp->b_blkno = -1; 751 else 752 bp->b_blkno = bn; 753 } 754 if (bp->b_blkno == -1) { 755 brelse(bp); 756 if (!error) 757 error = EIO; /* XXX */ 758 break; 759 } 760 } else { 761 /* 762 * The block we need to write into exists, so read it in. 763 */ 764 error = bread(thisvp, bn, pmp->pm_bpcluster, cred, &bp); 765 if (error) { 766 break; 767 } 768 } 769 770 /* 771 * Should these vnode_pager_* functions be done on dir 772 * files? 773 */ 774 775 /* 776 * Copy the data from user space into the buf header. 777 */ 778 error = vn_io_fault_uiomove(bp->b_data + croffset, n, uio); 779 if (error) { 780 brelse(bp); 781 break; 782 } 783 784 /* Prepare for clustered writes in some else clauses. */ 785 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) 786 bp->b_flags |= B_CLUSTEROK; 787 788 /* 789 * If IO_SYNC, then each buffer is written synchronously. 790 * Otherwise, if we have a severe page deficiency then 791 * write the buffer asynchronously. Otherwise, if on a 792 * cluster boundary then write the buffer asynchronously, 793 * combining it with contiguous clusters if permitted and 794 * possible, since we don't expect more writes into this 795 * buffer soon. Otherwise, do a delayed write because we 796 * expect more writes into this buffer soon. 797 */ 798 if (ioflag & IO_SYNC) 799 (void)bwrite(bp); 800 else if (vm_page_count_severe() || buf_dirty_count_severe()) 801 bawrite(bp); 802 else if (n + croffset == pmp->pm_bpcluster) { 803 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) 804 cluster_write(vp, bp, dep->de_FileSize, 805 seqcount, 0); 806 else 807 bawrite(bp); 808 } else 809 bdwrite(bp); 810 dep->de_flag |= DE_UPDATE; 811 } while (error == 0 && uio->uio_resid > 0); 812 813 /* 814 * If the write failed and they want us to, truncate the file back 815 * to the size it was before the write was attempted. 816 */ 817 errexit: 818 if (error) { 819 if (ioflag & IO_UNIT) { 820 detrunc(dep, osize, ioflag & IO_SYNC, NOCRED); 821 uio->uio_offset -= resid - uio->uio_resid; 822 uio->uio_resid = resid; 823 } else { 824 detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC, NOCRED); 825 if (uio->uio_resid != resid) 826 error = 0; 827 } 828 } else if (ioflag & IO_SYNC) 829 error = deupdat(dep, 1); 830 vn_rlimit_fsizex_res(uio, r); 831 return (error); 832 } 833 834 /* 835 * Flush the blocks of a file to disk. 836 */ 837 static int 838 msdosfs_fsync(struct vop_fsync_args *ap) 839 { 840 struct vnode *devvp; 841 int allerror, error; 842 843 vop_stdfsync(ap); 844 845 /* 846 * If the syncing request comes from fsync(2), sync the entire 847 * FAT and any other metadata that happens to be on devvp. We 848 * need this mainly for the FAT. We write the FAT sloppily, and 849 * syncing it all now is the best we can easily do to get all 850 * directory entries associated with the file (not just the file) 851 * fully synced. The other metadata includes critical metadata 852 * for all directory entries, but only in the MNT_ASYNC case. We 853 * will soon sync all metadata in the file's directory entry. 854 * Non-critical metadata for associated directory entries only 855 * gets synced accidentally, as in most file systems. 856 */ 857 if (ap->a_waitfor != MNT_NOWAIT) { 858 devvp = VTODE(ap->a_vp)->de_pmp->pm_devvp; 859 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 860 allerror = VOP_FSYNC(devvp, MNT_WAIT, ap->a_td); 861 VOP_UNLOCK(devvp); 862 } else 863 allerror = 0; 864 865 error = deupdat(VTODE(ap->a_vp), ap->a_waitfor != MNT_NOWAIT); 866 if (allerror == 0) 867 allerror = error; 868 return (allerror); 869 } 870 871 static int 872 msdosfs_remove(struct vop_remove_args *ap) 873 { 874 struct denode *dep = VTODE(ap->a_vp); 875 struct denode *ddep = VTODE(ap->a_dvp); 876 int error; 877 878 if (ap->a_vp->v_type == VDIR) 879 error = EPERM; 880 else 881 error = removede(ddep, dep); 882 #ifdef MSDOSFS_DEBUG 883 printf("msdosfs_remove(), dep %p, v_usecount %d\n", dep, ap->a_vp->v_usecount); 884 #endif 885 return (error); 886 } 887 888 /* 889 * DOS filesystems don't know what links are. 890 */ 891 static int 892 msdosfs_link(struct vop_link_args *ap) 893 { 894 return (EOPNOTSUPP); 895 } 896 897 /* 898 * Renames on files require moving the denode to a new hash queue since the 899 * denode's location is used to compute which hash queue to put the file 900 * in. Unless it is a rename in place. For example "mv a b". 901 * 902 * What follows is the basic algorithm: 903 * 904 * if (file move) { 905 * if (dest file exists) { 906 * remove dest file 907 * } 908 * if (dest and src in same directory) { 909 * rewrite name in existing directory slot 910 * } else { 911 * write new entry in dest directory 912 * update offset and dirclust in denode 913 * move denode to new hash chain 914 * clear old directory entry 915 * } 916 * } else { 917 * directory move 918 * if (dest directory exists) { 919 * if (dest is not empty) { 920 * return ENOTEMPTY 921 * } 922 * remove dest directory 923 * } 924 * if (dest and src in same directory) { 925 * rewrite name in existing entry 926 * } else { 927 * be sure dest is not a child of src directory 928 * write entry in dest directory 929 * update "." and ".." in moved directory 930 * clear old directory entry for moved directory 931 * } 932 * } 933 * 934 * On entry: 935 * source's parent directory is unlocked 936 * source file or directory is unlocked 937 * destination's parent directory is locked 938 * destination file or directory is locked if it exists 939 * 940 * On exit: 941 * all denodes should be released 942 */ 943 static int 944 msdosfs_rename(struct vop_rename_args *ap) 945 { 946 struct vnode *fdvp, *fvp, *tdvp, *tvp, *vp; 947 struct componentname *fcnp, *tcnp; 948 struct denode *fdip, *fip, *tdip, *tip, *nip; 949 u_char toname[12], oldname[11]; 950 u_long to_diroffset; 951 bool checkpath_locked, doingdirectory, newparent; 952 int error; 953 u_long cn, pcl, blkoff; 954 daddr_t bn, wait_scn, scn; 955 struct msdosfsmount *pmp; 956 struct direntry *dotdotp; 957 struct buf *bp; 958 959 tdvp = ap->a_tdvp; 960 fvp = ap->a_fvp; 961 fdvp = ap->a_fdvp; 962 tvp = ap->a_tvp; 963 tcnp = ap->a_tcnp; 964 fcnp = ap->a_fcnp; 965 pmp = VFSTOMSDOSFS(fdvp->v_mount); 966 967 #ifdef DIAGNOSTIC 968 if ((tcnp->cn_flags & HASBUF) == 0 || 969 (fcnp->cn_flags & HASBUF) == 0) 970 panic("msdosfs_rename: no name"); 971 #endif 972 /* 973 * Check for cross-device rename. 974 */ 975 if (fvp->v_mount != tdvp->v_mount || 976 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 977 error = EXDEV; 978 goto abortit; 979 } 980 981 /* 982 * If source and dest are the same, do nothing. 983 */ 984 if (tvp == fvp) { 985 error = 0; 986 goto abortit; 987 } 988 989 /* 990 * When the target exists, both the directory 991 * and target vnodes are passed locked. 992 */ 993 VOP_UNLOCK(tdvp); 994 if (tvp != NULL && tvp != tdvp) 995 VOP_UNLOCK(tvp); 996 997 checkpath_locked = false; 998 999 relock: 1000 doingdirectory = newparent = false; 1001 1002 error = vn_lock(fdvp, LK_EXCLUSIVE); 1003 if (error != 0) 1004 goto releout; 1005 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 1006 VOP_UNLOCK(fdvp); 1007 error = vn_lock(tdvp, LK_EXCLUSIVE); 1008 if (error != 0) 1009 goto releout; 1010 VOP_UNLOCK(tdvp); 1011 goto relock; 1012 } 1013 1014 error = msdosfs_lookup_ino(fdvp, NULL, fcnp, &scn, &blkoff); 1015 if (error != 0) { 1016 VOP_UNLOCK(fdvp); 1017 VOP_UNLOCK(tdvp); 1018 goto releout; 1019 } 1020 error = deget(pmp, scn, blkoff, LK_EXCLUSIVE | LK_NOWAIT, &nip); 1021 if (error != 0) { 1022 VOP_UNLOCK(fdvp); 1023 VOP_UNLOCK(tdvp); 1024 if (error != EBUSY) 1025 goto releout; 1026 error = deget(pmp, scn, blkoff, LK_EXCLUSIVE, &nip); 1027 if (error != 0) 1028 goto releout; 1029 vp = fvp; 1030 fvp = DETOV(nip); 1031 VOP_UNLOCK(fvp); 1032 vrele(vp); 1033 goto relock; 1034 } 1035 vrele(fvp); 1036 fvp = DETOV(nip); 1037 1038 error = msdosfs_lookup_ino(tdvp, NULL, tcnp, &scn, &blkoff); 1039 if (error != 0 && error != EJUSTRETURN) { 1040 VOP_UNLOCK(fdvp); 1041 VOP_UNLOCK(tdvp); 1042 VOP_UNLOCK(fvp); 1043 goto releout; 1044 } 1045 if (error == EJUSTRETURN && tvp != NULL) { 1046 vrele(tvp); 1047 tvp = NULL; 1048 } 1049 if (error == 0) { 1050 nip = NULL; 1051 error = deget(pmp, scn, blkoff, LK_EXCLUSIVE | LK_NOWAIT, 1052 &nip); 1053 if (tvp != NULL) { 1054 vrele(tvp); 1055 tvp = NULL; 1056 } 1057 if (error != 0) { 1058 VOP_UNLOCK(fdvp); 1059 VOP_UNLOCK(tdvp); 1060 VOP_UNLOCK(fvp); 1061 if (error != EBUSY) 1062 goto releout; 1063 error = deget(pmp, scn, blkoff, LK_EXCLUSIVE, 1064 &nip); 1065 if (error != 0) 1066 goto releout; 1067 vput(DETOV(nip)); 1068 goto relock; 1069 } 1070 tvp = DETOV(nip); 1071 } 1072 1073 fdip = VTODE(fdvp); 1074 fip = VTODE(fvp); 1075 tdip = VTODE(tdvp); 1076 tip = tvp != NULL ? VTODE(tvp) : NULL; 1077 1078 /* 1079 * Remember direntry place to use for destination 1080 */ 1081 to_diroffset = tdip->de_fndoffset; 1082 1083 /* 1084 * Be sure we are not renaming ".", "..", or an alias of ".". This 1085 * leads to a crippled directory tree. It's pretty tough to do a 1086 * "ls" or "pwd" with the "." directory entry missing, and "cd .." 1087 * doesn't work if the ".." entry is missing. 1088 */ 1089 if ((fip->de_Attributes & ATTR_DIRECTORY) != 0) { 1090 /* 1091 * Avoid ".", "..", and aliases of "." for obvious reasons. 1092 */ 1093 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 1094 fdip == fip || 1095 (fcnp->cn_flags & ISDOTDOT) != 0 || 1096 (tcnp->cn_flags & ISDOTDOT) != 0) { 1097 error = EINVAL; 1098 goto unlock; 1099 } 1100 doingdirectory = true; 1101 } 1102 1103 /* 1104 * If ".." must be changed (ie the directory gets a new 1105 * parent) then the source directory must not be in the 1106 * directory hierarchy above the target, as this would 1107 * orphan everything below the source directory. Also 1108 * the user must have write permission in the source so 1109 * as to be able to change "..". We must repeat the call 1110 * to namei, as the parent directory is unlocked by the 1111 * call to doscheckpath(). 1112 */ 1113 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread); 1114 if (fdip->de_StartCluster != tdip->de_StartCluster) 1115 newparent = true; 1116 if (doingdirectory && newparent) { 1117 if (error != 0) /* write access check above */ 1118 goto unlock; 1119 lockmgr(&pmp->pm_checkpath_lock, LK_EXCLUSIVE, NULL); 1120 checkpath_locked = true; 1121 error = doscheckpath(fip, tdip, &wait_scn); 1122 if (wait_scn != 0) { 1123 lockmgr(&pmp->pm_checkpath_lock, LK_RELEASE, NULL); 1124 checkpath_locked = false; 1125 VOP_UNLOCK(fdvp); 1126 VOP_UNLOCK(tdvp); 1127 VOP_UNLOCK(fvp); 1128 if (tvp != NULL && tvp != tdvp) 1129 VOP_UNLOCK(tvp); 1130 error = deget(pmp, wait_scn, 0, LK_EXCLUSIVE, 1131 &nip); 1132 if (error == 0) { 1133 vput(DETOV(nip)); 1134 goto relock; 1135 } 1136 } 1137 if (error != 0) 1138 goto unlock; 1139 if ((tcnp->cn_flags & SAVESTART) == 0) 1140 panic("msdosfs_rename: lost to startdir"); 1141 } 1142 1143 if (tip != NULL) { 1144 /* 1145 * Target must be empty if a directory and have no links 1146 * to it. Also, ensure source and target are compatible 1147 * (both directories, or both not directories). 1148 */ 1149 if ((tip->de_Attributes & ATTR_DIRECTORY) != 0) { 1150 if (!dosdirempty(tip)) { 1151 error = ENOTEMPTY; 1152 goto unlock; 1153 } 1154 if (!doingdirectory) { 1155 error = ENOTDIR; 1156 goto unlock; 1157 } 1158 cache_purge(tdvp); 1159 } else if (doingdirectory) { 1160 error = EISDIR; 1161 goto unlock; 1162 } 1163 error = msdosfs_lookup_ino(tdvp, NULL, tcnp, &scn, &blkoff); 1164 MPASS(error == 0); 1165 error = removede(tdip, tip); 1166 if (error != 0) 1167 goto unlock; 1168 vput(tvp); 1169 tvp = NULL; 1170 tip = NULL; 1171 } 1172 1173 /* 1174 * Convert the filename in tcnp into a dos filename. We copy this 1175 * into the denode and directory entry for the destination 1176 * file/directory. 1177 */ 1178 error = uniqdosname(tdip, tcnp, toname); 1179 if (error != 0) 1180 goto unlock; 1181 1182 /* 1183 * First write a new entry in the destination 1184 * directory and mark the entry in the source directory 1185 * as deleted. Then move the denode to the correct hash 1186 * chain for its new location in the filesystem. And, if 1187 * we moved a directory, then update its .. entry to point 1188 * to the new parent directory. 1189 */ 1190 memcpy(oldname, fip->de_Name, 11); 1191 memcpy(fip->de_Name, toname, 11); /* update denode */ 1192 error = msdosfs_lookup_ino(tdvp, NULL, tcnp, &scn, &blkoff); 1193 MPASS(error == EJUSTRETURN); 1194 error = createde(fip, tdip, NULL, tcnp); 1195 if (error != 0) { 1196 memcpy(fip->de_Name, oldname, 11); 1197 goto unlock; 1198 } 1199 1200 /* 1201 * If fip is for a directory, then its name should always 1202 * be "." since it is for the directory entry in the 1203 * directory itself (msdosfs_lookup() always translates 1204 * to the "." entry so as to get a unique denode, except 1205 * for the root directory there are different 1206 * complications). However, we just corrupted its name 1207 * to pass the correct name to createde(). Undo this. 1208 */ 1209 if ((fip->de_Attributes & ATTR_DIRECTORY) != 0) 1210 memcpy(fip->de_Name, oldname, 11); 1211 fip->de_refcnt++; 1212 error = msdosfs_lookup_ino(fdvp, NULL, fcnp, &scn, &blkoff); 1213 MPASS(error == 0); 1214 error = removede(fdip, fip); 1215 if (error != 0) { 1216 /* XXX should downgrade to ro here, fs is corrupt */ 1217 goto unlock; 1218 } 1219 if (!doingdirectory) { 1220 error = pcbmap(tdip, de_cluster(pmp, to_diroffset), 0, 1221 &fip->de_dirclust, 0); 1222 if (error != 0) { 1223 /* 1224 * XXX should downgrade to ro here, 1225 * fs is corrupt 1226 */ 1227 goto unlock; 1228 } 1229 if (fip->de_dirclust == MSDOSFSROOT) 1230 fip->de_diroffset = to_diroffset; 1231 else 1232 fip->de_diroffset = to_diroffset & pmp->pm_crbomask; 1233 } 1234 reinsert(fip); 1235 1236 /* 1237 * If we moved a directory to a new parent directory, then we must 1238 * fixup the ".." entry in the moved directory. 1239 */ 1240 if (doingdirectory && newparent) { 1241 cn = fip->de_StartCluster; 1242 if (cn == MSDOSFSROOT) { 1243 /* this should never happen */ 1244 panic("msdosfs_rename(): updating .. in root directory?"); 1245 } else 1246 bn = cntobn(pmp, cn); 1247 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, 1248 NOCRED, &bp); 1249 if (error != 0) { 1250 /* XXX should downgrade to ro here, fs is corrupt */ 1251 goto unlock; 1252 } 1253 dotdotp = (struct direntry *)bp->b_data + 1; 1254 pcl = tdip->de_StartCluster; 1255 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1256 pcl = MSDOSFSROOT; 1257 putushort(dotdotp->deStartCluster, pcl); 1258 if (FAT32(pmp)) 1259 putushort(dotdotp->deHighClust, pcl >> 16); 1260 if (DOINGASYNC(fvp)) 1261 bdwrite(bp); 1262 else if ((error = bwrite(bp)) != 0) { 1263 /* XXX should downgrade to ro here, fs is corrupt */ 1264 goto unlock; 1265 } 1266 } 1267 1268 /* 1269 * The msdosfs lookup is case insensitive. Several aliases may 1270 * be inserted for a single directory entry. As a consequnce, 1271 * name cache purge done by lookup for fvp when DELETE op for 1272 * namei is specified, might be not enough to expunge all 1273 * namecache entries that were installed for this direntry. 1274 */ 1275 cache_purge(fvp); 1276 1277 unlock: 1278 if (checkpath_locked) 1279 lockmgr(&pmp->pm_checkpath_lock, LK_RELEASE, NULL); 1280 vput(fdvp); 1281 vput(fvp); 1282 if (tvp != NULL) { 1283 if (tvp != tdvp) 1284 vput(tvp); 1285 else 1286 vrele(tvp); 1287 } 1288 vput(tdvp); 1289 return (error); 1290 releout: 1291 MPASS(!checkpath_locked); 1292 vrele(tdvp); 1293 if (tvp != NULL) 1294 vrele(tvp); 1295 vrele(fdvp); 1296 vrele(fvp); 1297 return (error); 1298 abortit: 1299 if (tdvp == tvp) 1300 vrele(tdvp); 1301 else 1302 vput(tdvp); 1303 if (tvp != NULL) 1304 vput(tvp); 1305 vrele(fdvp); 1306 vrele(fvp); 1307 return (error); 1308 } 1309 1310 static struct { 1311 struct direntry dot; 1312 struct direntry dotdot; 1313 } dosdirtemplate = { 1314 { ". ", /* the . entry */ 1315 ATTR_DIRECTORY, /* file attribute */ 1316 0, /* reserved */ 1317 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1318 { 0, 0 }, /* access date */ 1319 { 0, 0 }, /* high bits of start cluster */ 1320 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1321 { 0, 0 }, /* startcluster */ 1322 { 0, 0, 0, 0 } /* filesize */ 1323 }, 1324 { ".. ", /* the .. entry */ 1325 ATTR_DIRECTORY, /* file attribute */ 1326 0, /* reserved */ 1327 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1328 { 0, 0 }, /* access date */ 1329 { 0, 0 }, /* high bits of start cluster */ 1330 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1331 { 0, 0 }, /* startcluster */ 1332 { 0, 0, 0, 0 } /* filesize */ 1333 } 1334 }; 1335 1336 static int 1337 msdosfs_mkdir(struct vop_mkdir_args *ap) 1338 { 1339 struct componentname *cnp = ap->a_cnp; 1340 struct denode *dep; 1341 struct denode *pdep = VTODE(ap->a_dvp); 1342 struct direntry *denp; 1343 struct msdosfsmount *pmp = pdep->de_pmp; 1344 struct buf *bp; 1345 u_long newcluster, pcl; 1346 int bn; 1347 int error; 1348 struct denode ndirent; 1349 struct timespec ts; 1350 1351 /* 1352 * If this is the root directory and there is no space left we 1353 * can't do anything. This is because the root directory can not 1354 * change size. 1355 */ 1356 if (pdep->de_StartCluster == MSDOSFSROOT 1357 && pdep->de_fndoffset >= pdep->de_FileSize) { 1358 error = ENOSPC; 1359 goto bad2; 1360 } 1361 1362 /* 1363 * Allocate a cluster to hold the about to be created directory. 1364 */ 1365 error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL); 1366 if (error) 1367 goto bad2; 1368 1369 memset(&ndirent, 0, sizeof(ndirent)); 1370 ndirent.de_pmp = pmp; 1371 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 1372 vfs_timestamp(&ts); 1373 DETIMES(&ndirent, &ts, &ts, &ts); 1374 1375 /* 1376 * Now fill the cluster with the "." and ".." entries. And write 1377 * the cluster to disk. This way it is there for the parent 1378 * directory to be pointing at if there were a crash. 1379 */ 1380 bn = cntobn(pmp, newcluster); 1381 /* always succeeds */ 1382 bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0, 0); 1383 memset(bp->b_data, 0, pmp->pm_bpcluster); 1384 memcpy(bp->b_data, &dosdirtemplate, sizeof dosdirtemplate); 1385 denp = (struct direntry *)bp->b_data; 1386 putushort(denp[0].deStartCluster, newcluster); 1387 putushort(denp[0].deCDate, ndirent.de_CDate); 1388 putushort(denp[0].deCTime, ndirent.de_CTime); 1389 denp[0].deCHundredth = ndirent.de_CHun; 1390 putushort(denp[0].deADate, ndirent.de_ADate); 1391 putushort(denp[0].deMDate, ndirent.de_MDate); 1392 putushort(denp[0].deMTime, ndirent.de_MTime); 1393 pcl = pdep->de_StartCluster; 1394 /* 1395 * Although the root directory has a non-magic starting cluster 1396 * number for FAT32, chkdsk and fsck_msdosfs still require 1397 * references to it in dotdot entries to be magic. 1398 */ 1399 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1400 pcl = MSDOSFSROOT; 1401 putushort(denp[1].deStartCluster, pcl); 1402 putushort(denp[1].deCDate, ndirent.de_CDate); 1403 putushort(denp[1].deCTime, ndirent.de_CTime); 1404 denp[1].deCHundredth = ndirent.de_CHun; 1405 putushort(denp[1].deADate, ndirent.de_ADate); 1406 putushort(denp[1].deMDate, ndirent.de_MDate); 1407 putushort(denp[1].deMTime, ndirent.de_MTime); 1408 if (FAT32(pmp)) { 1409 putushort(denp[0].deHighClust, newcluster >> 16); 1410 putushort(denp[1].deHighClust, pcl >> 16); 1411 } 1412 1413 if (DOINGASYNC(ap->a_dvp)) 1414 bdwrite(bp); 1415 else if ((error = bwrite(bp)) != 0) 1416 goto bad; 1417 1418 /* 1419 * Now build up a directory entry pointing to the newly allocated 1420 * cluster. This will be written to an empty slot in the parent 1421 * directory. 1422 */ 1423 #ifdef DIAGNOSTIC 1424 if ((cnp->cn_flags & HASBUF) == 0) 1425 panic("msdosfs_mkdir: no name"); 1426 #endif 1427 error = uniqdosname(pdep, cnp, ndirent.de_Name); 1428 if (error) 1429 goto bad; 1430 1431 ndirent.de_Attributes = ATTR_DIRECTORY; 1432 ndirent.de_LowerCase = 0; 1433 ndirent.de_StartCluster = newcluster; 1434 ndirent.de_FileSize = 0; 1435 error = createde(&ndirent, pdep, &dep, cnp); 1436 if (error) 1437 goto bad; 1438 *ap->a_vpp = DETOV(dep); 1439 return (0); 1440 1441 bad: 1442 clusterfree(pmp, newcluster); 1443 bad2: 1444 return (error); 1445 } 1446 1447 static int 1448 msdosfs_rmdir(struct vop_rmdir_args *ap) 1449 { 1450 struct vnode *vp = ap->a_vp; 1451 struct vnode *dvp = ap->a_dvp; 1452 struct componentname *cnp = ap->a_cnp; 1453 struct denode *ip, *dp; 1454 int error; 1455 1456 ip = VTODE(vp); 1457 dp = VTODE(dvp); 1458 1459 /* 1460 * Verify the directory is empty (and valid). 1461 * (Rmdir ".." won't be valid since 1462 * ".." will contain a reference to 1463 * the current directory and thus be 1464 * non-empty.) 1465 */ 1466 error = 0; 1467 if (!dosdirempty(ip)) { 1468 error = ENOTEMPTY; 1469 goto out; 1470 } 1471 /* 1472 * Delete the entry from the directory. For dos filesystems this 1473 * gets rid of the directory entry on disk, the in memory copy 1474 * still exists but the de_refcnt is <= 0. This prevents it from 1475 * being found by deget(). When the vput() on dep is done we give 1476 * up access and eventually msdosfs_reclaim() will be called which 1477 * will remove it from the denode cache. 1478 */ 1479 error = removede(dp, ip); 1480 if (error) 1481 goto out; 1482 /* 1483 * This is where we decrement the link count in the parent 1484 * directory. Since dos filesystems don't do this we just purge 1485 * the name cache. 1486 */ 1487 cache_purge(dvp); 1488 /* 1489 * Truncate the directory that is being deleted. 1490 */ 1491 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred); 1492 cache_purge(vp); 1493 1494 out: 1495 return (error); 1496 } 1497 1498 /* 1499 * DOS filesystems don't know what symlinks are. 1500 */ 1501 static int 1502 msdosfs_symlink(struct vop_symlink_args *ap) 1503 { 1504 return (EOPNOTSUPP); 1505 } 1506 1507 static int 1508 msdosfs_readdir(struct vop_readdir_args *ap) 1509 { 1510 struct mbnambuf nb; 1511 int error = 0; 1512 int diff; 1513 long n; 1514 int blsize; 1515 long on; 1516 u_long cn; 1517 u_long dirsperblk; 1518 long bias = 0; 1519 daddr_t bn, lbn; 1520 struct buf *bp; 1521 struct denode *dep = VTODE(ap->a_vp); 1522 struct msdosfsmount *pmp = dep->de_pmp; 1523 struct direntry *dentp; 1524 struct dirent dirbuf; 1525 struct uio *uio = ap->a_uio; 1526 u_long *cookies = NULL; 1527 int ncookies = 0; 1528 off_t offset, off; 1529 int chksum = -1; 1530 1531 #ifdef MSDOSFS_DEBUG 1532 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n", 1533 ap->a_vp, uio, ap->a_cred, ap->a_eofflag); 1534 #endif 1535 1536 /* 1537 * msdosfs_readdir() won't operate properly on regular files since 1538 * it does i/o only with the filesystem vnode, and hence can 1539 * retrieve the wrong block from the buffer cache for a plain file. 1540 * So, fail attempts to readdir() on a plain file. 1541 */ 1542 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) 1543 return (ENOTDIR); 1544 1545 /* 1546 * To be safe, initialize dirbuf 1547 */ 1548 memset(dirbuf.d_name, 0, sizeof(dirbuf.d_name)); 1549 1550 /* 1551 * If the user buffer is smaller than the size of one dos directory 1552 * entry or the file offset is not a multiple of the size of a 1553 * directory entry, then we fail the read. 1554 */ 1555 off = offset = uio->uio_offset; 1556 if (uio->uio_resid < sizeof(struct direntry) || 1557 (offset & (sizeof(struct direntry) - 1))) 1558 return (EINVAL); 1559 1560 if (ap->a_ncookies) { 1561 ncookies = uio->uio_resid / 16; 1562 cookies = malloc(ncookies * sizeof(u_long), M_TEMP, 1563 M_WAITOK); 1564 *ap->a_cookies = cookies; 1565 *ap->a_ncookies = ncookies; 1566 } 1567 1568 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 1569 1570 /* 1571 * If they are reading from the root directory then, we simulate 1572 * the . and .. entries since these don't exist in the root 1573 * directory. We also set the offset bias to make up for having to 1574 * simulate these entries. By this I mean that at file offset 64 we 1575 * read the first entry in the root directory that lives on disk. 1576 */ 1577 if (dep->de_StartCluster == MSDOSFSROOT 1578 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) { 1579 #if 0 1580 printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n", 1581 offset); 1582 #endif 1583 bias = 2 * sizeof(struct direntry); 1584 if (offset < bias) { 1585 for (n = (int)offset / sizeof(struct direntry); 1586 n < 2; n++) { 1587 dirbuf.d_fileno = FAT32(pmp) ? 1588 (uint64_t)cntobn(pmp, pmp->pm_rootdirblk) * 1589 dirsperblk : 1; 1590 dirbuf.d_type = DT_DIR; 1591 switch (n) { 1592 case 0: 1593 dirbuf.d_namlen = 1; 1594 dirbuf.d_name[0] = '.'; 1595 break; 1596 case 1: 1597 dirbuf.d_namlen = 2; 1598 dirbuf.d_name[0] = '.'; 1599 dirbuf.d_name[1] = '.'; 1600 break; 1601 } 1602 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1603 /* NOTE: d_off is the offset of the *next* entry. */ 1604 dirbuf.d_off = offset + sizeof(struct direntry); 1605 dirent_terminate(&dirbuf); 1606 if (uio->uio_resid < dirbuf.d_reclen) 1607 goto out; 1608 error = uiomove(&dirbuf, dirbuf.d_reclen, uio); 1609 if (error) 1610 goto out; 1611 offset += sizeof(struct direntry); 1612 off = offset; 1613 if (cookies) { 1614 *cookies++ = offset; 1615 if (--ncookies <= 0) 1616 goto out; 1617 } 1618 } 1619 } 1620 } 1621 1622 mbnambuf_init(&nb); 1623 off = offset; 1624 while (uio->uio_resid > 0) { 1625 lbn = de_cluster(pmp, offset - bias); 1626 on = (offset - bias) & pmp->pm_crbomask; 1627 n = min(pmp->pm_bpcluster - on, uio->uio_resid); 1628 diff = dep->de_FileSize - (offset - bias); 1629 if (diff <= 0) 1630 break; 1631 n = min(n, diff); 1632 error = pcbmap(dep, lbn, &bn, &cn, &blsize); 1633 if (error) 1634 break; 1635 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp); 1636 if (error) { 1637 return (error); 1638 } 1639 n = min(n, blsize - bp->b_resid); 1640 if (n == 0) { 1641 brelse(bp); 1642 return (EIO); 1643 } 1644 1645 /* 1646 * Convert from dos directory entries to fs-independent 1647 * directory entries. 1648 */ 1649 for (dentp = (struct direntry *)(bp->b_data + on); 1650 (char *)dentp < bp->b_data + on + n; 1651 dentp++, offset += sizeof(struct direntry)) { 1652 #if 0 1653 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n", 1654 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes); 1655 #endif 1656 /* 1657 * If this is an unused entry, we can stop. 1658 */ 1659 if (dentp->deName[0] == SLOT_EMPTY) { 1660 brelse(bp); 1661 goto out; 1662 } 1663 /* 1664 * Skip deleted entries. 1665 */ 1666 if (dentp->deName[0] == SLOT_DELETED) { 1667 chksum = -1; 1668 mbnambuf_init(&nb); 1669 continue; 1670 } 1671 1672 /* 1673 * Handle Win95 long directory entries 1674 */ 1675 if (dentp->deAttributes == ATTR_WIN95) { 1676 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) 1677 continue; 1678 chksum = win2unixfn(&nb, 1679 (struct winentry *)dentp, chksum, pmp); 1680 continue; 1681 } 1682 1683 /* 1684 * Skip volume labels 1685 */ 1686 if (dentp->deAttributes & ATTR_VOLUME) { 1687 chksum = -1; 1688 mbnambuf_init(&nb); 1689 continue; 1690 } 1691 /* 1692 * This computation of d_fileno must match 1693 * the computation of va_fileid in 1694 * msdosfs_getattr. 1695 */ 1696 if (dentp->deAttributes & ATTR_DIRECTORY) { 1697 cn = getushort(dentp->deStartCluster); 1698 if (FAT32(pmp)) { 1699 cn |= getushort(dentp->deHighClust) << 1700 16; 1701 if (cn == MSDOSFSROOT) 1702 cn = pmp->pm_rootdirblk; 1703 } 1704 if (cn == MSDOSFSROOT && !FAT32(pmp)) 1705 dirbuf.d_fileno = 1; 1706 else 1707 dirbuf.d_fileno = cntobn(pmp, cn) * 1708 dirsperblk; 1709 dirbuf.d_type = DT_DIR; 1710 } else { 1711 dirbuf.d_fileno = (uoff_t)offset / 1712 sizeof(struct direntry); 1713 dirbuf.d_type = DT_REG; 1714 } 1715 1716 if (chksum != winChksum(dentp->deName)) { 1717 dirbuf.d_namlen = dos2unixfn(dentp->deName, 1718 (u_char *)dirbuf.d_name, 1719 dentp->deLowerCase | 1720 ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ? 1721 (LCASE_BASE | LCASE_EXT) : 0), 1722 pmp); 1723 mbnambuf_init(&nb); 1724 } else 1725 mbnambuf_flush(&nb, &dirbuf); 1726 chksum = -1; 1727 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1728 /* NOTE: d_off is the offset of the *next* entry. */ 1729 dirbuf.d_off = offset + sizeof(struct direntry); 1730 dirent_terminate(&dirbuf); 1731 if (uio->uio_resid < dirbuf.d_reclen) { 1732 brelse(bp); 1733 goto out; 1734 } 1735 error = uiomove(&dirbuf, dirbuf.d_reclen, uio); 1736 if (error) { 1737 brelse(bp); 1738 goto out; 1739 } 1740 if (cookies) { 1741 *cookies++ = offset + sizeof(struct direntry); 1742 if (--ncookies <= 0) { 1743 brelse(bp); 1744 goto out; 1745 } 1746 } 1747 off = offset + sizeof(struct direntry); 1748 } 1749 brelse(bp); 1750 } 1751 out: 1752 /* Subtract unused cookies */ 1753 if (ap->a_ncookies) 1754 *ap->a_ncookies -= ncookies; 1755 1756 uio->uio_offset = off; 1757 1758 /* 1759 * Set the eofflag (NFS uses it) 1760 */ 1761 if (ap->a_eofflag) { 1762 if (dep->de_FileSize - (offset - bias) <= 0) 1763 *ap->a_eofflag = 1; 1764 else 1765 *ap->a_eofflag = 0; 1766 } 1767 return (error); 1768 } 1769 1770 /*- 1771 * a_vp - pointer to the file's vnode 1772 * a_bn - logical block number within the file (cluster number for us) 1773 * a_bop - where to return the bufobj of the special file containing the fs 1774 * a_bnp - where to return the "physical" block number corresponding to a_bn 1775 * (relative to the special file; units are blocks of size DEV_BSIZE) 1776 * a_runp - where to return the "run past" a_bn. This is the count of logical 1777 * blocks whose physical blocks (together with a_bn's physical block) 1778 * are contiguous. 1779 * a_runb - where to return the "run before" a_bn. 1780 */ 1781 static int 1782 msdosfs_bmap(struct vop_bmap_args *ap) 1783 { 1784 struct fatcache savefc; 1785 struct denode *dep; 1786 struct mount *mp; 1787 struct msdosfsmount *pmp; 1788 struct vnode *vp; 1789 daddr_t runbn; 1790 u_long cn; 1791 int bnpercn, error, maxio, maxrun, run; 1792 1793 vp = ap->a_vp; 1794 dep = VTODE(vp); 1795 pmp = dep->de_pmp; 1796 if (ap->a_bop != NULL) 1797 *ap->a_bop = &pmp->pm_devvp->v_bufobj; 1798 if (ap->a_bnp == NULL) 1799 return (0); 1800 if (ap->a_runp != NULL) 1801 *ap->a_runp = 0; 1802 if (ap->a_runb != NULL) 1803 *ap->a_runb = 0; 1804 cn = ap->a_bn; 1805 if (cn != ap->a_bn) 1806 return (EFBIG); 1807 error = pcbmap(dep, cn, ap->a_bnp, NULL, NULL); 1808 if (error != 0 || (ap->a_runp == NULL && ap->a_runb == NULL)) 1809 return (error); 1810 1811 /* 1812 * Prepare to back out updates of the fatchain cache after the one 1813 * for the first block done by pcbmap() above. Without the backout, 1814 * then whenever the caller doesn't do i/o to all of the blocks that 1815 * we find, the single useful cache entry would be too far in advance 1816 * of the actual i/o to work for the next sequential i/o. Then the 1817 * FAT would be searched from the beginning. With the backout, the 1818 * FAT is searched starting at most a few blocks early. This wastes 1819 * much less time. Time is also wasted finding more blocks than the 1820 * caller will do i/o to. This is necessary because the runlength 1821 * parameters are output-only. 1822 */ 1823 savefc = dep->de_fc[FC_LASTMAP]; 1824 1825 mp = vp->v_mount; 1826 maxio = mp->mnt_iosize_max / mp->mnt_stat.f_iosize; 1827 bnpercn = de_cn2bn(pmp, 1); 1828 if (ap->a_runp != NULL) { 1829 maxrun = ulmin(maxio - 1, pmp->pm_maxcluster - cn); 1830 for (run = 1; run <= maxrun; run++) { 1831 if (pcbmap(dep, cn + run, &runbn, NULL, NULL) != 0 || 1832 runbn != *ap->a_bnp + run * bnpercn) 1833 break; 1834 } 1835 *ap->a_runp = run - 1; 1836 } 1837 if (ap->a_runb != NULL) { 1838 maxrun = ulmin(maxio - 1, cn); 1839 for (run = 1; run < maxrun; run++) { 1840 if (pcbmap(dep, cn - run, &runbn, NULL, NULL) != 0 || 1841 runbn != *ap->a_bnp - run * bnpercn) 1842 break; 1843 } 1844 *ap->a_runb = run - 1; 1845 } 1846 dep->de_fc[FC_LASTMAP] = savefc; 1847 return (0); 1848 } 1849 1850 SYSCTL_NODE(_vfs, OID_AUTO, msdosfs, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 1851 "msdos filesystem"); 1852 static int use_buf_pager = 1; 1853 SYSCTL_INT(_vfs_msdosfs, OID_AUTO, use_buf_pager, CTLFLAG_RWTUN, 1854 &use_buf_pager, 0, 1855 "Use buffer pager instead of bmap"); 1856 1857 static daddr_t 1858 msdosfs_gbp_getblkno(struct vnode *vp, vm_ooffset_t off) 1859 { 1860 1861 return (de_cluster(VTODE(vp)->de_pmp, off)); 1862 } 1863 1864 static int 1865 msdosfs_gbp_getblksz(struct vnode *vp, daddr_t lbn, long *sz) 1866 { 1867 1868 *sz = VTODE(vp)->de_pmp->pm_bpcluster; 1869 return (0); 1870 } 1871 1872 static int 1873 msdosfs_getpages(struct vop_getpages_args *ap) 1874 { 1875 1876 if (use_buf_pager) 1877 return (vfs_bio_getpages(ap->a_vp, ap->a_m, ap->a_count, 1878 ap->a_rbehind, ap->a_rahead, msdosfs_gbp_getblkno, 1879 msdosfs_gbp_getblksz)); 1880 return (vnode_pager_generic_getpages(ap->a_vp, ap->a_m, ap->a_count, 1881 ap->a_rbehind, ap->a_rahead, NULL, NULL)); 1882 } 1883 1884 static int 1885 msdosfs_strategy(struct vop_strategy_args *ap) 1886 { 1887 struct buf *bp = ap->a_bp; 1888 struct denode *dep = VTODE(ap->a_vp); 1889 struct bufobj *bo; 1890 int error = 0; 1891 daddr_t blkno; 1892 1893 /* 1894 * If we don't already know the filesystem relative block number 1895 * then get it using pcbmap(). If pcbmap() returns the block 1896 * number as -1 then we've got a hole in the file. DOS filesystems 1897 * don't allow files with holes, so we shouldn't ever see this. 1898 */ 1899 if (bp->b_blkno == bp->b_lblkno) { 1900 error = pcbmap(dep, bp->b_lblkno, &blkno, 0, 0); 1901 bp->b_blkno = blkno; 1902 if (error) { 1903 bp->b_error = error; 1904 bp->b_ioflags |= BIO_ERROR; 1905 bufdone(bp); 1906 return (0); 1907 } 1908 if ((long)bp->b_blkno == -1) 1909 vfs_bio_clrbuf(bp); 1910 } 1911 if (bp->b_blkno == -1) { 1912 bufdone(bp); 1913 return (0); 1914 } 1915 /* 1916 * Read/write the block from/to the disk that contains the desired 1917 * file block. 1918 */ 1919 bp->b_iooffset = dbtob(bp->b_blkno); 1920 bo = dep->de_pmp->pm_bo; 1921 BO_STRATEGY(bo, bp); 1922 return (0); 1923 } 1924 1925 static int 1926 msdosfs_print(struct vop_print_args *ap) 1927 { 1928 struct denode *dep = VTODE(ap->a_vp); 1929 1930 printf("\tstartcluster %lu, dircluster %lu, diroffset %lu, ", 1931 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset); 1932 printf("on dev %s\n", devtoname(dep->de_pmp->pm_dev)); 1933 return (0); 1934 } 1935 1936 static int 1937 msdosfs_pathconf(struct vop_pathconf_args *ap) 1938 { 1939 struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp; 1940 1941 switch (ap->a_name) { 1942 case _PC_FILESIZEBITS: 1943 *ap->a_retval = 32; 1944 return (0); 1945 case _PC_LINK_MAX: 1946 *ap->a_retval = 1; 1947 return (0); 1948 case _PC_NAME_MAX: 1949 *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12; 1950 return (0); 1951 case _PC_CHOWN_RESTRICTED: 1952 *ap->a_retval = 1; 1953 return (0); 1954 case _PC_NO_TRUNC: 1955 *ap->a_retval = 0; 1956 return (0); 1957 default: 1958 return (vop_stdpathconf(ap)); 1959 } 1960 /* NOTREACHED */ 1961 } 1962 1963 static int 1964 msdosfs_vptofh(struct vop_vptofh_args *ap) 1965 { 1966 struct denode *dep; 1967 struct defid *defhp; 1968 1969 dep = VTODE(ap->a_vp); 1970 defhp = (struct defid *)ap->a_fhp; 1971 defhp->defid_len = sizeof(struct defid); 1972 defhp->defid_dirclust = dep->de_dirclust; 1973 defhp->defid_dirofs = dep->de_diroffset; 1974 /* defhp->defid_gen = dep->de_gen; */ 1975 return (0); 1976 } 1977 1978 /* Global vfs data structures for msdosfs */ 1979 struct vop_vector msdosfs_vnodeops = { 1980 .vop_default = &default_vnodeops, 1981 1982 .vop_access = msdosfs_access, 1983 .vop_bmap = msdosfs_bmap, 1984 .vop_getpages = msdosfs_getpages, 1985 .vop_cachedlookup = msdosfs_lookup, 1986 .vop_open = msdosfs_open, 1987 .vop_close = msdosfs_close, 1988 .vop_create = msdosfs_create, 1989 .vop_fsync = msdosfs_fsync, 1990 .vop_fdatasync = vop_stdfdatasync_buf, 1991 .vop_getattr = msdosfs_getattr, 1992 .vop_inactive = msdosfs_inactive, 1993 .vop_link = msdosfs_link, 1994 .vop_lookup = vfs_cache_lookup, 1995 .vop_mkdir = msdosfs_mkdir, 1996 .vop_mknod = msdosfs_mknod, 1997 .vop_pathconf = msdosfs_pathconf, 1998 .vop_print = msdosfs_print, 1999 .vop_read = msdosfs_read, 2000 .vop_readdir = msdosfs_readdir, 2001 .vop_reclaim = msdosfs_reclaim, 2002 .vop_remove = msdosfs_remove, 2003 .vop_rename = msdosfs_rename, 2004 .vop_rmdir = msdosfs_rmdir, 2005 .vop_setattr = msdosfs_setattr, 2006 .vop_strategy = msdosfs_strategy, 2007 .vop_symlink = msdosfs_symlink, 2008 .vop_write = msdosfs_write, 2009 .vop_vptofh = msdosfs_vptofh, 2010 }; 2011 VFS_VOP_VECTOR_REGISTER(msdosfs_vnodeops);
Cache object: 38778ae7295f1a0cfe632a2a02bebbee
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