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 = detrunc(dep, vap->va_size, 0, cred); 464 if (error) 465 return error; 466 } 467 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 468 if (vp->v_mount->mnt_flag & MNT_RDONLY) 469 return (EROFS); 470 error = vn_utimes_perm(vp, vap, cred, td); 471 if (error != 0) 472 return (error); 473 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 && 474 vap->va_atime.tv_sec != VNOVAL) { 475 dep->de_flag &= ~DE_ACCESS; 476 timespec2fattime(&vap->va_atime, 0, 477 &dep->de_ADate, NULL, NULL); 478 } 479 if (vap->va_mtime.tv_sec != VNOVAL) { 480 dep->de_flag &= ~DE_UPDATE; 481 timespec2fattime(&vap->va_mtime, 0, 482 &dep->de_MDate, &dep->de_MTime, NULL); 483 } 484 /* 485 * We don't set the archive bit when modifying the time of 486 * a directory to emulate the Windows/DOS behavior. 487 */ 488 if (vp->v_type != VDIR) 489 dep->de_Attributes |= ATTR_ARCHIVE; 490 dep->de_flag |= DE_MODIFIED; 491 } 492 /* 493 * DOS files only have the ability to have their writability 494 * attribute set, so we use the owner write bit to set the readonly 495 * attribute. 496 */ 497 if (vap->va_mode != (mode_t)VNOVAL) { 498 if (vp->v_mount->mnt_flag & MNT_RDONLY) 499 return (EROFS); 500 if (cred->cr_uid != pmp->pm_uid) { 501 error = priv_check_cred(cred, PRIV_VFS_ADMIN); 502 if (error) 503 return (error); 504 } 505 if (vp->v_type != VDIR) { 506 /* We ignore the read and execute bits. */ 507 if (vap->va_mode & S_IWUSR) 508 dep->de_Attributes &= ~ATTR_READONLY; 509 else 510 dep->de_Attributes |= ATTR_READONLY; 511 dep->de_Attributes |= ATTR_ARCHIVE; 512 dep->de_flag |= DE_MODIFIED; 513 } 514 } 515 return (deupdat(dep, 0)); 516 } 517 518 static int 519 msdosfs_read(struct vop_read_args *ap) 520 { 521 int error = 0; 522 int blsize; 523 int isadir; 524 ssize_t orig_resid; 525 u_int n; 526 u_long diff; 527 u_long on; 528 daddr_t lbn; 529 daddr_t rablock; 530 int rasize; 531 int seqcount; 532 struct buf *bp; 533 struct vnode *vp = ap->a_vp; 534 struct denode *dep = VTODE(vp); 535 struct msdosfsmount *pmp = dep->de_pmp; 536 struct uio *uio = ap->a_uio; 537 538 /* 539 * If they didn't ask for any data, then we are done. 540 */ 541 orig_resid = uio->uio_resid; 542 if (orig_resid == 0) 543 return (0); 544 545 /* 546 * The caller is supposed to ensure that 547 * uio->uio_offset >= 0 and uio->uio_resid >= 0. 548 * We don't need to check for large offsets as in ffs because 549 * dep->de_FileSize <= MSDOSFS_FILESIZE_MAX < OFF_MAX, so large 550 * offsets cannot cause overflow even in theory. 551 */ 552 553 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 554 555 isadir = dep->de_Attributes & ATTR_DIRECTORY; 556 do { 557 if (uio->uio_offset >= dep->de_FileSize) 558 break; 559 lbn = de_cluster(pmp, uio->uio_offset); 560 rablock = lbn + 1; 561 blsize = pmp->pm_bpcluster; 562 on = uio->uio_offset & pmp->pm_crbomask; 563 /* 564 * If we are operating on a directory file then be sure to 565 * do i/o with the vnode for the filesystem instead of the 566 * vnode for the directory. 567 */ 568 if (isadir) { 569 /* convert cluster # to block # */ 570 error = pcbmap(dep, lbn, &lbn, 0, &blsize); 571 if (error == E2BIG) { 572 error = EINVAL; 573 break; 574 } else if (error) 575 break; 576 error = bread(pmp->pm_devvp, lbn, blsize, NOCRED, &bp); 577 } else if (de_cn2off(pmp, rablock) >= dep->de_FileSize) { 578 error = bread(vp, lbn, blsize, NOCRED, &bp); 579 } else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) { 580 error = cluster_read(vp, dep->de_FileSize, lbn, blsize, 581 NOCRED, on + uio->uio_resid, seqcount, 0, &bp); 582 } else if (seqcount > 1) { 583 rasize = blsize; 584 error = breadn(vp, lbn, 585 blsize, &rablock, &rasize, 1, NOCRED, &bp); 586 } else { 587 error = bread(vp, lbn, blsize, NOCRED, &bp); 588 } 589 if (error) { 590 brelse(bp); 591 break; 592 } 593 diff = pmp->pm_bpcluster - on; 594 n = diff > uio->uio_resid ? uio->uio_resid : diff; 595 diff = dep->de_FileSize - uio->uio_offset; 596 if (diff < n) 597 n = diff; 598 diff = blsize - bp->b_resid; 599 if (diff < n) 600 n = diff; 601 error = vn_io_fault_uiomove(bp->b_data + on, (int) n, uio); 602 brelse(bp); 603 } while (error == 0 && uio->uio_resid > 0 && n != 0); 604 if (!isadir && (error == 0 || uio->uio_resid != orig_resid) && 605 (vp->v_mount->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0) 606 dep->de_flag |= DE_ACCESS; 607 return (error); 608 } 609 610 /* 611 * Write data to a file or directory. 612 */ 613 static int 614 msdosfs_write(struct vop_write_args *ap) 615 { 616 int n; 617 int croffset; 618 ssize_t resid; 619 u_long osize; 620 int error = 0; 621 u_long count; 622 int seqcount; 623 daddr_t bn, lastcn; 624 struct buf *bp; 625 int ioflag = ap->a_ioflag; 626 struct uio *uio = ap->a_uio; 627 struct vnode *vp = ap->a_vp; 628 struct vnode *thisvp; 629 struct denode *dep = VTODE(vp); 630 struct msdosfsmount *pmp = dep->de_pmp; 631 struct ucred *cred = ap->a_cred; 632 633 #ifdef MSDOSFS_DEBUG 634 printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n", 635 vp, uio, ioflag, cred); 636 printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n", 637 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster); 638 #endif 639 640 switch (vp->v_type) { 641 case VREG: 642 if (ioflag & IO_APPEND) 643 uio->uio_offset = dep->de_FileSize; 644 thisvp = vp; 645 break; 646 case VDIR: 647 return EISDIR; 648 default: 649 panic("msdosfs_write(): bad file type"); 650 } 651 652 /* 653 * This is needed (unlike in ffs_write()) because we extend the 654 * file outside of the loop but we don't want to extend the file 655 * for writes of 0 bytes. 656 */ 657 if (uio->uio_resid == 0) 658 return (0); 659 660 /* 661 * The caller is supposed to ensure that 662 * uio->uio_offset >= 0 and uio->uio_resid >= 0. 663 */ 664 if ((uoff_t)uio->uio_offset + uio->uio_resid > MSDOSFS_FILESIZE_MAX) 665 return (EFBIG); 666 667 /* 668 * If they've exceeded their filesize limit, tell them about it. 669 */ 670 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 671 return (EFBIG); 672 673 /* 674 * If the offset we are starting the write at is beyond the end of 675 * the file, then they've done a seek. Unix filesystems allow 676 * files with holes in them, DOS doesn't so we must fill the hole 677 * with zeroed blocks. 678 */ 679 if (uio->uio_offset > dep->de_FileSize) { 680 error = deextend(dep, uio->uio_offset, cred); 681 if (error) 682 return (error); 683 } 684 685 /* 686 * Remember some values in case the write fails. 687 */ 688 resid = uio->uio_resid; 689 osize = dep->de_FileSize; 690 691 /* 692 * If we write beyond the end of the file, extend it to its ultimate 693 * size ahead of the time to hopefully get a contiguous area. 694 */ 695 if (uio->uio_offset + resid > osize) { 696 count = de_clcount(pmp, uio->uio_offset + resid) - 697 de_clcount(pmp, osize); 698 error = extendfile(dep, count, NULL, NULL, 0); 699 if (error && (error != ENOSPC || (ioflag & IO_UNIT))) 700 goto errexit; 701 lastcn = dep->de_fc[FC_LASTFC].fc_frcn; 702 } else 703 lastcn = de_clcount(pmp, osize) - 1; 704 705 seqcount = ioflag >> IO_SEQSHIFT; 706 do { 707 if (de_cluster(pmp, uio->uio_offset) > lastcn) { 708 error = ENOSPC; 709 break; 710 } 711 712 croffset = uio->uio_offset & pmp->pm_crbomask; 713 n = min(uio->uio_resid, pmp->pm_bpcluster - croffset); 714 if (uio->uio_offset + n > dep->de_FileSize) { 715 dep->de_FileSize = uio->uio_offset + n; 716 /* The object size needs to be set before buffer is allocated */ 717 vnode_pager_setsize(vp, dep->de_FileSize); 718 } 719 720 bn = de_cluster(pmp, uio->uio_offset); 721 if ((uio->uio_offset & pmp->pm_crbomask) == 0 722 && (de_cluster(pmp, uio->uio_offset + uio->uio_resid) 723 > de_cluster(pmp, uio->uio_offset) 724 || uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) { 725 /* 726 * If either the whole cluster gets written, 727 * or we write the cluster from its start beyond EOF, 728 * then no need to read data from disk. 729 */ 730 bp = getblk(thisvp, bn, pmp->pm_bpcluster, 0, 0, 0); 731 /* 732 * This call to vfs_bio_clrbuf() ensures that 733 * even if vn_io_fault_uiomove() below faults, 734 * garbage from the newly instantiated buffer 735 * is not exposed to the userspace via mmap(). 736 */ 737 vfs_bio_clrbuf(bp); 738 /* 739 * Do the bmap now, since pcbmap needs buffers 740 * for the FAT table. (see msdosfs_strategy) 741 */ 742 if (bp->b_blkno == bp->b_lblkno) { 743 error = pcbmap(dep, bp->b_lblkno, &bn, 0, 0); 744 if (error) 745 bp->b_blkno = -1; 746 else 747 bp->b_blkno = bn; 748 } 749 if (bp->b_blkno == -1) { 750 brelse(bp); 751 if (!error) 752 error = EIO; /* XXX */ 753 break; 754 } 755 } else { 756 /* 757 * The block we need to write into exists, so read it in. 758 */ 759 error = bread(thisvp, bn, pmp->pm_bpcluster, cred, &bp); 760 if (error) { 761 break; 762 } 763 } 764 765 /* 766 * Should these vnode_pager_* functions be done on dir 767 * files? 768 */ 769 770 /* 771 * Copy the data from user space into the buf header. 772 */ 773 error = vn_io_fault_uiomove(bp->b_data + croffset, n, uio); 774 if (error) { 775 brelse(bp); 776 break; 777 } 778 779 /* Prepare for clustered writes in some else clauses. */ 780 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) 781 bp->b_flags |= B_CLUSTEROK; 782 783 /* 784 * If IO_SYNC, then each buffer is written synchronously. 785 * Otherwise, if we have a severe page deficiency then 786 * write the buffer asynchronously. Otherwise, if on a 787 * cluster boundary then write the buffer asynchronously, 788 * combining it with contiguous clusters if permitted and 789 * possible, since we don't expect more writes into this 790 * buffer soon. Otherwise, do a delayed write because we 791 * expect more writes into this buffer soon. 792 */ 793 if (ioflag & IO_SYNC) 794 (void)bwrite(bp); 795 else if (vm_page_count_severe() || buf_dirty_count_severe()) 796 bawrite(bp); 797 else if (n + croffset == pmp->pm_bpcluster) { 798 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) 799 cluster_write(vp, &dep->de_clusterw, bp, 800 dep->de_FileSize, seqcount, 0); 801 else 802 bawrite(bp); 803 } else 804 bdwrite(bp); 805 dep->de_flag |= DE_UPDATE; 806 } while (error == 0 && uio->uio_resid > 0); 807 808 /* 809 * If the write failed and they want us to, truncate the file back 810 * to the size it was before the write was attempted. 811 */ 812 errexit: 813 if (error) { 814 if (ioflag & IO_UNIT) { 815 detrunc(dep, osize, ioflag & IO_SYNC, NOCRED); 816 uio->uio_offset -= resid - uio->uio_resid; 817 uio->uio_resid = resid; 818 } else { 819 detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC, NOCRED); 820 if (uio->uio_resid != resid) 821 error = 0; 822 } 823 } else if (ioflag & IO_SYNC) 824 error = deupdat(dep, 1); 825 return (error); 826 } 827 828 /* 829 * Flush the blocks of a file to disk. 830 */ 831 static int 832 msdosfs_fsync(struct vop_fsync_args *ap) 833 { 834 struct vnode *devvp; 835 int allerror, error; 836 837 vop_stdfsync(ap); 838 839 /* 840 * If the syncing request comes from fsync(2), sync the entire 841 * FAT and any other metadata that happens to be on devvp. We 842 * need this mainly for the FAT. We write the FAT sloppily, and 843 * syncing it all now is the best we can easily do to get all 844 * directory entries associated with the file (not just the file) 845 * fully synced. The other metadata includes critical metadata 846 * for all directory entries, but only in the MNT_ASYNC case. We 847 * will soon sync all metadata in the file's directory entry. 848 * Non-critical metadata for associated directory entries only 849 * gets synced accidentally, as in most file systems. 850 */ 851 if (ap->a_waitfor != MNT_NOWAIT) { 852 devvp = VTODE(ap->a_vp)->de_pmp->pm_devvp; 853 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 854 allerror = VOP_FSYNC(devvp, MNT_WAIT, ap->a_td); 855 VOP_UNLOCK(devvp); 856 } else 857 allerror = 0; 858 859 error = deupdat(VTODE(ap->a_vp), ap->a_waitfor != MNT_NOWAIT); 860 if (allerror == 0) 861 allerror = error; 862 return (allerror); 863 } 864 865 static int 866 msdosfs_remove(struct vop_remove_args *ap) 867 { 868 struct denode *dep = VTODE(ap->a_vp); 869 struct denode *ddep = VTODE(ap->a_dvp); 870 int error; 871 872 if (ap->a_vp->v_type == VDIR) 873 error = EPERM; 874 else 875 error = removede(ddep, dep); 876 #ifdef MSDOSFS_DEBUG 877 printf("msdosfs_remove(), dep %p, v_usecount %d\n", dep, ap->a_vp->v_usecount); 878 #endif 879 return (error); 880 } 881 882 /* 883 * DOS filesystems don't know what links are. 884 */ 885 static int 886 msdosfs_link(struct vop_link_args *ap) 887 { 888 return (EOPNOTSUPP); 889 } 890 891 /* 892 * Renames on files require moving the denode to a new hash queue since the 893 * denode's location is used to compute which hash queue to put the file 894 * in. Unless it is a rename in place. For example "mv a b". 895 * 896 * What follows is the basic algorithm: 897 * 898 * if (file move) { 899 * if (dest file exists) { 900 * remove dest file 901 * } 902 * if (dest and src in same directory) { 903 * rewrite name in existing directory slot 904 * } else { 905 * write new entry in dest directory 906 * update offset and dirclust in denode 907 * move denode to new hash chain 908 * clear old directory entry 909 * } 910 * } else { 911 * directory move 912 * if (dest directory exists) { 913 * if (dest is not empty) { 914 * return ENOTEMPTY 915 * } 916 * remove dest directory 917 * } 918 * if (dest and src in same directory) { 919 * rewrite name in existing entry 920 * } else { 921 * be sure dest is not a child of src directory 922 * write entry in dest directory 923 * update "." and ".." in moved directory 924 * clear old directory entry for moved directory 925 * } 926 * } 927 * 928 * On entry: 929 * source's parent directory is unlocked 930 * source file or directory is unlocked 931 * destination's parent directory is locked 932 * destination file or directory is locked if it exists 933 * 934 * On exit: 935 * all denodes should be released 936 */ 937 static int 938 msdosfs_rename(struct vop_rename_args *ap) 939 { 940 struct vnode *fdvp, *fvp, *tdvp, *tvp, *vp; 941 struct componentname *fcnp, *tcnp; 942 struct denode *fdip, *fip, *tdip, *tip, *nip; 943 u_char toname[12], oldname[11]; 944 u_long from_diroffset, to_diroffset; 945 bool checkpath_locked, doingdirectory, newparent; 946 u_char to_count; 947 int error; 948 u_long cn, pcl, blkoff; 949 daddr_t bn, wait_scn, scn; 950 struct msdosfsmount *pmp; 951 struct mount *mp; 952 struct direntry *dotdotp; 953 struct buf *bp; 954 955 tdvp = ap->a_tdvp; 956 fvp = ap->a_fvp; 957 fdvp = ap->a_fdvp; 958 tvp = ap->a_tvp; 959 tcnp = ap->a_tcnp; 960 fcnp = ap->a_fcnp; 961 pmp = VFSTOMSDOSFS(fdvp->v_mount); 962 963 #ifdef DIAGNOSTIC 964 if ((tcnp->cn_flags & HASBUF) == 0 || 965 (fcnp->cn_flags & HASBUF) == 0) 966 panic("msdosfs_rename: no name"); 967 #endif 968 /* 969 * Check for cross-device rename. 970 */ 971 mp = fvp->v_mount; 972 if (fvp->v_mount != tdvp->v_mount || 973 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 974 error = EXDEV; 975 goto abortit; 976 } 977 978 /* 979 * If source and dest are the same, do nothing. 980 */ 981 if (tvp == fvp) { 982 error = 0; 983 goto abortit; 984 } 985 986 /* 987 * When the target exists, both the directory 988 * and target vnodes are passed locked. 989 */ 990 VOP_UNLOCK(tdvp); 991 if (tvp != NULL && tvp != tdvp) 992 VOP_UNLOCK(tvp); 993 994 checkpath_locked = false; 995 996 relock: 997 doingdirectory = newparent = false; 998 999 error = vn_lock(fdvp, LK_EXCLUSIVE); 1000 if (error != 0) 1001 goto releout; 1002 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 1003 VOP_UNLOCK(fdvp); 1004 error = vn_lock(tdvp, LK_EXCLUSIVE); 1005 if (error != 0) 1006 goto releout; 1007 VOP_UNLOCK(tdvp); 1008 goto relock; 1009 } 1010 1011 error = msdosfs_lookup_ino(fdvp, NULL, fcnp, &scn, &blkoff); 1012 if (error != 0) { 1013 VOP_UNLOCK(fdvp); 1014 VOP_UNLOCK(tdvp); 1015 goto releout; 1016 } 1017 error = deget(pmp, scn, blkoff, LK_EXCLUSIVE | LK_NOWAIT, &nip); 1018 if (error != 0) { 1019 VOP_UNLOCK(fdvp); 1020 VOP_UNLOCK(tdvp); 1021 if (error != EBUSY) 1022 goto releout; 1023 error = deget(pmp, scn, blkoff, LK_EXCLUSIVE, &nip); 1024 if (error != 0) 1025 goto releout; 1026 vp = fvp; 1027 fvp = DETOV(nip); 1028 VOP_UNLOCK(fvp); 1029 vrele(vp); 1030 goto relock; 1031 } 1032 vrele(fvp); 1033 fvp = DETOV(nip); 1034 from_diroffset = fdip->de_fndoffset; 1035 1036 error = msdosfs_lookup_ino(tdvp, NULL, tcnp, &scn, &blkoff); 1037 if (error != 0 && error != EJUSTRETURN) { 1038 VOP_UNLOCK(fdvp); 1039 VOP_UNLOCK(tdvp); 1040 VOP_UNLOCK(fvp); 1041 goto releout; 1042 } 1043 if (error == EJUSTRETURN && tvp != NULL) { 1044 vrele(tvp); 1045 tvp = NULL; 1046 } 1047 if (error == 0) { 1048 nip = NULL; 1049 error = deget(pmp, scn, blkoff, LK_EXCLUSIVE | LK_NOWAIT, 1050 &nip); 1051 if (tvp != NULL) { 1052 vrele(tvp); 1053 tvp = NULL; 1054 } 1055 if (error != 0) { 1056 VOP_UNLOCK(fdvp); 1057 VOP_UNLOCK(tdvp); 1058 VOP_UNLOCK(fvp); 1059 if (error != EBUSY) 1060 goto releout; 1061 error = deget(pmp, scn, blkoff, LK_EXCLUSIVE, 1062 &nip); 1063 if (error != 0) 1064 goto releout; 1065 vput(DETOV(nip)); 1066 goto relock; 1067 } 1068 tvp = DETOV(nip); 1069 } 1070 1071 fdip = VTODE(fdvp); 1072 fip = VTODE(fvp); 1073 tdip = VTODE(tdvp); 1074 tip = tvp != NULL ? VTODE(tvp) : NULL; 1075 1076 /* 1077 * Remember direntry place to use for destination 1078 */ 1079 to_diroffset = tdip->de_fndoffset; 1080 to_count = tdip->de_fndcnt; 1081 1082 /* 1083 * Be sure we are not renaming ".", "..", or an alias of ".". This 1084 * leads to a crippled directory tree. It's pretty tough to do a 1085 * "ls" or "pwd" with the "." directory entry missing, and "cd .." 1086 * doesn't work if the ".." entry is missing. 1087 */ 1088 if ((fip->de_Attributes & ATTR_DIRECTORY) != 0) { 1089 /* 1090 * Avoid ".", "..", and aliases of "." for obvious reasons. 1091 */ 1092 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 1093 fdip == fip || 1094 (fcnp->cn_flags & ISDOTDOT) != 0 || 1095 (tcnp->cn_flags & ISDOTDOT) != 0) { 1096 error = EINVAL; 1097 goto unlock; 1098 } 1099 doingdirectory = true; 1100 } 1101 1102 /* 1103 * If ".." must be changed (ie the directory gets a new 1104 * parent) then the source directory must not be in the 1105 * directory hierarchy above the target, as this would 1106 * orphan everything below the source directory. Also 1107 * the user must have write permission in the source so 1108 * as to be able to change "..". We must repeat the call 1109 * to namei, as the parent directory is unlocked by the 1110 * call to doscheckpath(). 1111 */ 1112 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread); 1113 if (fdip->de_StartCluster != tdip->de_StartCluster) 1114 newparent = true; 1115 if (doingdirectory && newparent) { 1116 if (error != 0) /* write access check above */ 1117 goto unlock; 1118 lockmgr(&pmp->pm_checkpath_lock, LK_EXCLUSIVE, NULL); 1119 checkpath_locked = true; 1120 error = doscheckpath(fip, tdip, &wait_scn); 1121 if (wait_scn != 0) { 1122 lockmgr(&pmp->pm_checkpath_lock, LK_RELEASE, NULL); 1123 checkpath_locked = false; 1124 VOP_UNLOCK(fdvp); 1125 VOP_UNLOCK(tdvp); 1126 VOP_UNLOCK(fvp); 1127 if (tvp != NULL && tvp != tdvp) 1128 VOP_UNLOCK(tvp); 1129 error = deget(pmp, wait_scn, 0, LK_EXCLUSIVE, 1130 &nip); 1131 if (error == 0) { 1132 vput(DETOV(nip)); 1133 goto relock; 1134 } 1135 } 1136 if (error != 0) 1137 goto unlock; 1138 if ((tcnp->cn_flags & SAVESTART) == 0) 1139 panic("msdosfs_rename: lost to startdir"); 1140 } 1141 1142 if (tip != NULL) { 1143 /* 1144 * Target must be empty if a directory and have no links 1145 * to it. Also, ensure source and target are compatible 1146 * (both directories, or both not directories). 1147 */ 1148 if ((tip->de_Attributes & ATTR_DIRECTORY) != 0) { 1149 if (!dosdirempty(tip)) { 1150 error = ENOTEMPTY; 1151 goto unlock; 1152 } 1153 if (!doingdirectory) { 1154 error = ENOTDIR; 1155 goto unlock; 1156 } 1157 cache_purge(tdvp); 1158 } else if (doingdirectory) { 1159 error = EISDIR; 1160 goto unlock; 1161 } 1162 error = msdosfs_lookup_ino(tdvp, NULL, tcnp, &scn, &blkoff); 1163 MPASS(error == 0); 1164 error = removede(tdip, tip); 1165 if (error != 0) 1166 goto unlock; 1167 vput(tvp); 1168 tvp = NULL; 1169 tip = NULL; 1170 } 1171 1172 /* 1173 * Convert the filename in tcnp into a dos filename. We copy this 1174 * into the denode and directory entry for the destination 1175 * file/directory. 1176 */ 1177 error = uniqdosname(tdip, tcnp, toname); 1178 if (error != 0) 1179 goto unlock; 1180 1181 /* 1182 * First write a new entry in the destination 1183 * directory and mark the entry in the source directory 1184 * as deleted. Then move the denode to the correct hash 1185 * chain for its new location in the filesystem. And, if 1186 * we moved a directory, then update its .. entry to point 1187 * to the new parent directory. 1188 */ 1189 memcpy(oldname, fip->de_Name, 11); 1190 memcpy(fip->de_Name, toname, 11); /* update denode */ 1191 error = msdosfs_lookup_ino(tdvp, NULL, tcnp, &scn, &blkoff); 1192 MPASS(error == EJUSTRETURN); 1193 error = createde(fip, tdip, NULL, tcnp); 1194 if (error != 0) { 1195 memcpy(fip->de_Name, oldname, 11); 1196 goto unlock; 1197 } 1198 1199 /* 1200 * If fip is for a directory, then its name should always 1201 * be "." since it is for the directory entry in the 1202 * directory itself (msdosfs_lookup() always translates 1203 * to the "." entry so as to get a unique denode, except 1204 * for the root directory there are different 1205 * complications). However, we just corrupted its name 1206 * to pass the correct name to createde(). Undo this. 1207 */ 1208 if ((fip->de_Attributes & ATTR_DIRECTORY) != 0) 1209 memcpy(fip->de_Name, oldname, 11); 1210 fip->de_refcnt++; 1211 error = msdosfs_lookup_ino(fdvp, NULL, fcnp, &scn, &blkoff); 1212 MPASS(error == 0); 1213 error = removede(fdip, fip); 1214 if (error != 0) { 1215 /* XXX should downgrade to ro here, fs is corrupt */ 1216 goto unlock; 1217 } 1218 if (!doingdirectory) { 1219 error = pcbmap(tdip, de_cluster(pmp, to_diroffset), 0, 1220 &fip->de_dirclust, 0); 1221 if (error != 0) { 1222 /* 1223 * XXX should downgrade to ro here, 1224 * fs is corrupt 1225 */ 1226 goto unlock; 1227 } 1228 if (fip->de_dirclust == MSDOSFSROOT) 1229 fip->de_diroffset = to_diroffset; 1230 else 1231 fip->de_diroffset = to_diroffset & pmp->pm_crbomask; 1232 } 1233 reinsert(fip); 1234 1235 /* 1236 * If we moved a directory to a new parent directory, then we must 1237 * fixup the ".." entry in the moved directory. 1238 */ 1239 if (doingdirectory && newparent) { 1240 cn = fip->de_StartCluster; 1241 if (cn == MSDOSFSROOT) { 1242 /* this should never happen */ 1243 panic("msdosfs_rename(): updating .. in root directory?"); 1244 } else 1245 bn = cntobn(pmp, cn); 1246 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, 1247 NOCRED, &bp); 1248 if (error != 0) { 1249 /* XXX should downgrade to ro here, fs is corrupt */ 1250 goto unlock; 1251 } 1252 dotdotp = (struct direntry *)bp->b_data + 1; 1253 pcl = tdip->de_StartCluster; 1254 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1255 pcl = MSDOSFSROOT; 1256 putushort(dotdotp->deStartCluster, pcl); 1257 if (FAT32(pmp)) 1258 putushort(dotdotp->deHighClust, pcl >> 16); 1259 if (DOINGASYNC(fvp)) 1260 bdwrite(bp); 1261 else if ((error = bwrite(bp)) != 0) { 1262 /* XXX should downgrade to ro here, fs is corrupt */ 1263 goto unlock; 1264 } 1265 } 1266 1267 /* 1268 * The msdosfs lookup is case insensitive. Several aliases may 1269 * be inserted for a single directory entry. As a consequnce, 1270 * name cache purge done by lookup for fvp when DELETE op for 1271 * namei is specified, might be not enough to expunge all 1272 * namecache entries that were installed for this direntry. 1273 */ 1274 cache_purge(fvp); 1275 1276 unlock: 1277 if (checkpath_locked) 1278 lockmgr(&pmp->pm_checkpath_lock, LK_RELEASE, NULL); 1279 vput(fdvp); 1280 vput(fvp); 1281 if (tvp != NULL) { 1282 if (tvp != tdvp) 1283 vput(tvp); 1284 else 1285 vrele(tvp); 1286 } 1287 vput(tdvp); 1288 return (error); 1289 releout: 1290 MPASS(!checkpath_locked); 1291 vrele(tdvp); 1292 if (tvp != NULL) 1293 vrele(tvp); 1294 vrele(fdvp); 1295 vrele(fvp); 1296 return (error); 1297 abortit: 1298 if (tdvp == tvp) 1299 vrele(tdvp); 1300 else 1301 vput(tdvp); 1302 if (tvp != NULL) 1303 vput(tvp); 1304 vrele(fdvp); 1305 vrele(fvp); 1306 return (error); 1307 } 1308 1309 static struct { 1310 struct direntry dot; 1311 struct direntry dotdot; 1312 } dosdirtemplate = { 1313 { ". ", /* the . entry */ 1314 ATTR_DIRECTORY, /* file attribute */ 1315 0, /* reserved */ 1316 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1317 { 0, 0 }, /* access date */ 1318 { 0, 0 }, /* high bits of start cluster */ 1319 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1320 { 0, 0 }, /* startcluster */ 1321 { 0, 0, 0, 0 } /* filesize */ 1322 }, 1323 { ".. ", /* the .. entry */ 1324 ATTR_DIRECTORY, /* file attribute */ 1325 0, /* reserved */ 1326 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1327 { 0, 0 }, /* access date */ 1328 { 0, 0 }, /* high bits of start cluster */ 1329 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1330 { 0, 0 }, /* startcluster */ 1331 { 0, 0, 0, 0 } /* filesize */ 1332 } 1333 }; 1334 1335 static int 1336 msdosfs_mkdir(struct vop_mkdir_args *ap) 1337 { 1338 struct componentname *cnp = ap->a_cnp; 1339 struct denode *dep; 1340 struct denode *pdep = VTODE(ap->a_dvp); 1341 struct direntry *denp; 1342 struct msdosfsmount *pmp = pdep->de_pmp; 1343 struct buf *bp; 1344 u_long newcluster, pcl; 1345 int bn; 1346 int error; 1347 struct denode ndirent; 1348 struct timespec ts; 1349 1350 /* 1351 * If this is the root directory and there is no space left we 1352 * can't do anything. This is because the root directory can not 1353 * change size. 1354 */ 1355 if (pdep->de_StartCluster == MSDOSFSROOT 1356 && pdep->de_fndoffset >= pdep->de_FileSize) { 1357 error = ENOSPC; 1358 goto bad2; 1359 } 1360 1361 /* 1362 * Allocate a cluster to hold the about to be created directory. 1363 */ 1364 error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL); 1365 if (error) 1366 goto bad2; 1367 1368 memset(&ndirent, 0, sizeof(ndirent)); 1369 ndirent.de_pmp = pmp; 1370 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 1371 vfs_timestamp(&ts); 1372 DETIMES(&ndirent, &ts, &ts, &ts); 1373 1374 /* 1375 * Now fill the cluster with the "." and ".." entries. And write 1376 * the cluster to disk. This way it is there for the parent 1377 * directory to be pointing at if there were a crash. 1378 */ 1379 bn = cntobn(pmp, newcluster); 1380 /* always succeeds */ 1381 bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0, 0); 1382 memset(bp->b_data, 0, pmp->pm_bpcluster); 1383 memcpy(bp->b_data, &dosdirtemplate, sizeof dosdirtemplate); 1384 denp = (struct direntry *)bp->b_data; 1385 putushort(denp[0].deStartCluster, newcluster); 1386 putushort(denp[0].deCDate, ndirent.de_CDate); 1387 putushort(denp[0].deCTime, ndirent.de_CTime); 1388 denp[0].deCHundredth = ndirent.de_CHun; 1389 putushort(denp[0].deADate, ndirent.de_ADate); 1390 putushort(denp[0].deMDate, ndirent.de_MDate); 1391 putushort(denp[0].deMTime, ndirent.de_MTime); 1392 pcl = pdep->de_StartCluster; 1393 /* 1394 * Although the root directory has a non-magic starting cluster 1395 * number for FAT32, chkdsk and fsck_msdosfs still require 1396 * references to it in dotdot entries to be magic. 1397 */ 1398 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1399 pcl = MSDOSFSROOT; 1400 putushort(denp[1].deStartCluster, pcl); 1401 putushort(denp[1].deCDate, ndirent.de_CDate); 1402 putushort(denp[1].deCTime, ndirent.de_CTime); 1403 denp[1].deCHundredth = ndirent.de_CHun; 1404 putushort(denp[1].deADate, ndirent.de_ADate); 1405 putushort(denp[1].deMDate, ndirent.de_MDate); 1406 putushort(denp[1].deMTime, ndirent.de_MTime); 1407 if (FAT32(pmp)) { 1408 putushort(denp[0].deHighClust, newcluster >> 16); 1409 putushort(denp[1].deHighClust, pcl >> 16); 1410 } 1411 1412 if (DOINGASYNC(ap->a_dvp)) 1413 bdwrite(bp); 1414 else if ((error = bwrite(bp)) != 0) 1415 goto bad; 1416 1417 /* 1418 * Now build up a directory entry pointing to the newly allocated 1419 * cluster. This will be written to an empty slot in the parent 1420 * directory. 1421 */ 1422 #ifdef DIAGNOSTIC 1423 if ((cnp->cn_flags & HASBUF) == 0) 1424 panic("msdosfs_mkdir: no name"); 1425 #endif 1426 error = uniqdosname(pdep, cnp, ndirent.de_Name); 1427 if (error) 1428 goto bad; 1429 1430 ndirent.de_Attributes = ATTR_DIRECTORY; 1431 ndirent.de_LowerCase = 0; 1432 ndirent.de_StartCluster = newcluster; 1433 ndirent.de_FileSize = 0; 1434 error = createde(&ndirent, pdep, &dep, cnp); 1435 if (error) 1436 goto bad; 1437 *ap->a_vpp = DETOV(dep); 1438 return (0); 1439 1440 bad: 1441 clusterfree(pmp, newcluster, NULL); 1442 bad2: 1443 return (error); 1444 } 1445 1446 static int 1447 msdosfs_rmdir(struct vop_rmdir_args *ap) 1448 { 1449 struct vnode *vp = ap->a_vp; 1450 struct vnode *dvp = ap->a_dvp; 1451 struct componentname *cnp = ap->a_cnp; 1452 struct denode *ip, *dp; 1453 int error; 1454 1455 ip = VTODE(vp); 1456 dp = VTODE(dvp); 1457 1458 /* 1459 * Verify the directory is empty (and valid). 1460 * (Rmdir ".." won't be valid since 1461 * ".." will contain a reference to 1462 * the current directory and thus be 1463 * non-empty.) 1464 */ 1465 error = 0; 1466 if (!dosdirempty(ip)) { 1467 error = ENOTEMPTY; 1468 goto out; 1469 } 1470 /* 1471 * Delete the entry from the directory. For dos filesystems this 1472 * gets rid of the directory entry on disk, the in memory copy 1473 * still exists but the de_refcnt is <= 0. This prevents it from 1474 * being found by deget(). When the vput() on dep is done we give 1475 * up access and eventually msdosfs_reclaim() will be called which 1476 * will remove it from the denode cache. 1477 */ 1478 error = removede(dp, ip); 1479 if (error) 1480 goto out; 1481 /* 1482 * This is where we decrement the link count in the parent 1483 * directory. Since dos filesystems don't do this we just purge 1484 * the name cache. 1485 */ 1486 cache_purge(dvp); 1487 /* 1488 * Truncate the directory that is being deleted. 1489 */ 1490 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred); 1491 cache_purge(vp); 1492 1493 out: 1494 return (error); 1495 } 1496 1497 /* 1498 * DOS filesystems don't know what symlinks are. 1499 */ 1500 static int 1501 msdosfs_symlink(struct vop_symlink_args *ap) 1502 { 1503 return (EOPNOTSUPP); 1504 } 1505 1506 static int 1507 msdosfs_readdir(struct vop_readdir_args *ap) 1508 { 1509 struct mbnambuf nb; 1510 int error = 0; 1511 int diff; 1512 long n; 1513 int blsize; 1514 long on; 1515 u_long cn; 1516 u_long dirsperblk; 1517 long bias = 0; 1518 daddr_t bn, lbn; 1519 struct buf *bp; 1520 struct denode *dep = VTODE(ap->a_vp); 1521 struct msdosfsmount *pmp = dep->de_pmp; 1522 struct direntry *dentp; 1523 struct dirent dirbuf; 1524 struct uio *uio = ap->a_uio; 1525 u_long *cookies = NULL; 1526 int ncookies = 0; 1527 off_t offset, off; 1528 int chksum = -1; 1529 1530 #ifdef MSDOSFS_DEBUG 1531 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n", 1532 ap->a_vp, uio, ap->a_cred, ap->a_eofflag); 1533 #endif 1534 1535 /* 1536 * msdosfs_readdir() won't operate properly on regular files since 1537 * it does i/o only with the filesystem vnode, and hence can 1538 * retrieve the wrong block from the buffer cache for a plain file. 1539 * So, fail attempts to readdir() on a plain file. 1540 */ 1541 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) 1542 return (ENOTDIR); 1543 1544 /* 1545 * To be safe, initialize dirbuf 1546 */ 1547 memset(dirbuf.d_name, 0, sizeof(dirbuf.d_name)); 1548 1549 /* 1550 * If the user buffer is smaller than the size of one dos directory 1551 * entry or the file offset is not a multiple of the size of a 1552 * directory entry, then we fail the read. 1553 */ 1554 off = offset = uio->uio_offset; 1555 if (uio->uio_resid < sizeof(struct direntry) || 1556 (offset & (sizeof(struct direntry) - 1))) 1557 return (EINVAL); 1558 1559 if (ap->a_ncookies) { 1560 ncookies = uio->uio_resid / 16; 1561 cookies = malloc(ncookies * sizeof(u_long), M_TEMP, 1562 M_WAITOK); 1563 *ap->a_cookies = cookies; 1564 *ap->a_ncookies = ncookies; 1565 } 1566 1567 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 1568 1569 /* 1570 * If they are reading from the root directory then, we simulate 1571 * the . and .. entries since these don't exist in the root 1572 * directory. We also set the offset bias to make up for having to 1573 * simulate these entries. By this I mean that at file offset 64 we 1574 * read the first entry in the root directory that lives on disk. 1575 */ 1576 if (dep->de_StartCluster == MSDOSFSROOT 1577 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) { 1578 #if 0 1579 printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n", 1580 offset); 1581 #endif 1582 bias = 2 * sizeof(struct direntry); 1583 if (offset < bias) { 1584 for (n = (int)offset / sizeof(struct direntry); 1585 n < 2; n++) { 1586 dirbuf.d_fileno = FAT32(pmp) ? 1587 (uint64_t)cntobn(pmp, pmp->pm_rootdirblk) * 1588 dirsperblk : 1; 1589 dirbuf.d_type = DT_DIR; 1590 switch (n) { 1591 case 0: 1592 dirbuf.d_namlen = 1; 1593 dirbuf.d_name[0] = '.'; 1594 break; 1595 case 1: 1596 dirbuf.d_namlen = 2; 1597 dirbuf.d_name[0] = '.'; 1598 dirbuf.d_name[1] = '.'; 1599 break; 1600 } 1601 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1602 /* NOTE: d_off is the offset of the *next* entry. */ 1603 dirbuf.d_off = offset + sizeof(struct direntry); 1604 dirent_terminate(&dirbuf); 1605 if (uio->uio_resid < dirbuf.d_reclen) 1606 goto out; 1607 error = uiomove(&dirbuf, dirbuf.d_reclen, uio); 1608 if (error) 1609 goto out; 1610 offset += sizeof(struct direntry); 1611 off = offset; 1612 if (cookies) { 1613 *cookies++ = offset; 1614 if (--ncookies <= 0) 1615 goto out; 1616 } 1617 } 1618 } 1619 } 1620 1621 mbnambuf_init(&nb); 1622 off = offset; 1623 while (uio->uio_resid > 0) { 1624 lbn = de_cluster(pmp, offset - bias); 1625 on = (offset - bias) & pmp->pm_crbomask; 1626 n = min(pmp->pm_bpcluster - on, uio->uio_resid); 1627 diff = dep->de_FileSize - (offset - bias); 1628 if (diff <= 0) 1629 break; 1630 n = min(n, diff); 1631 error = pcbmap(dep, lbn, &bn, &cn, &blsize); 1632 if (error) 1633 break; 1634 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp); 1635 if (error) { 1636 return (error); 1637 } 1638 n = min(n, blsize - bp->b_resid); 1639 if (n == 0) { 1640 brelse(bp); 1641 return (EIO); 1642 } 1643 1644 /* 1645 * Convert from dos directory entries to fs-independent 1646 * directory entries. 1647 */ 1648 for (dentp = (struct direntry *)(bp->b_data + on); 1649 (char *)dentp < bp->b_data + on + n; 1650 dentp++, offset += sizeof(struct direntry)) { 1651 #if 0 1652 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n", 1653 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes); 1654 #endif 1655 /* 1656 * If this is an unused entry, we can stop. 1657 */ 1658 if (dentp->deName[0] == SLOT_EMPTY) { 1659 brelse(bp); 1660 goto out; 1661 } 1662 /* 1663 * Skip deleted entries. 1664 */ 1665 if (dentp->deName[0] == SLOT_DELETED) { 1666 chksum = -1; 1667 mbnambuf_init(&nb); 1668 continue; 1669 } 1670 1671 /* 1672 * Handle Win95 long directory entries 1673 */ 1674 if (dentp->deAttributes == ATTR_WIN95) { 1675 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) 1676 continue; 1677 chksum = win2unixfn(&nb, 1678 (struct winentry *)dentp, chksum, pmp); 1679 continue; 1680 } 1681 1682 /* 1683 * Skip volume labels 1684 */ 1685 if (dentp->deAttributes & ATTR_VOLUME) { 1686 chksum = -1; 1687 mbnambuf_init(&nb); 1688 continue; 1689 } 1690 /* 1691 * This computation of d_fileno must match 1692 * the computation of va_fileid in 1693 * msdosfs_getattr. 1694 */ 1695 if (dentp->deAttributes & ATTR_DIRECTORY) { 1696 cn = getushort(dentp->deStartCluster); 1697 if (FAT32(pmp)) { 1698 cn |= getushort(dentp->deHighClust) << 1699 16; 1700 if (cn == MSDOSFSROOT) 1701 cn = pmp->pm_rootdirblk; 1702 } 1703 if (cn == MSDOSFSROOT && !FAT32(pmp)) 1704 dirbuf.d_fileno = 1; 1705 else 1706 dirbuf.d_fileno = cntobn(pmp, cn) * 1707 dirsperblk; 1708 dirbuf.d_type = DT_DIR; 1709 } else { 1710 dirbuf.d_fileno = (uoff_t)offset / 1711 sizeof(struct direntry); 1712 dirbuf.d_type = DT_REG; 1713 } 1714 1715 if (chksum != winChksum(dentp->deName)) { 1716 dirbuf.d_namlen = dos2unixfn(dentp->deName, 1717 (u_char *)dirbuf.d_name, 1718 dentp->deLowerCase | 1719 ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ? 1720 (LCASE_BASE | LCASE_EXT) : 0), 1721 pmp); 1722 mbnambuf_init(&nb); 1723 } else 1724 mbnambuf_flush(&nb, &dirbuf); 1725 chksum = -1; 1726 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1727 /* NOTE: d_off is the offset of the *next* entry. */ 1728 dirbuf.d_off = offset + sizeof(struct direntry); 1729 dirent_terminate(&dirbuf); 1730 if (uio->uio_resid < dirbuf.d_reclen) { 1731 brelse(bp); 1732 goto out; 1733 } 1734 error = uiomove(&dirbuf, dirbuf.d_reclen, uio); 1735 if (error) { 1736 brelse(bp); 1737 goto out; 1738 } 1739 if (cookies) { 1740 *cookies++ = offset + sizeof(struct direntry); 1741 if (--ncookies <= 0) { 1742 brelse(bp); 1743 goto out; 1744 } 1745 } 1746 off = offset + sizeof(struct direntry); 1747 } 1748 brelse(bp); 1749 } 1750 out: 1751 /* Subtract unused cookies */ 1752 if (ap->a_ncookies) 1753 *ap->a_ncookies -= ncookies; 1754 1755 uio->uio_offset = off; 1756 1757 /* 1758 * Set the eofflag (NFS uses it) 1759 */ 1760 if (ap->a_eofflag) { 1761 if (dep->de_FileSize - (offset - bias) <= 0) 1762 *ap->a_eofflag = 1; 1763 else 1764 *ap->a_eofflag = 0; 1765 } 1766 return (error); 1767 } 1768 1769 /*- 1770 * a_vp - pointer to the file's vnode 1771 * a_bn - logical block number within the file (cluster number for us) 1772 * a_bop - where to return the bufobj of the special file containing the fs 1773 * a_bnp - where to return the "physical" block number corresponding to a_bn 1774 * (relative to the special file; units are blocks of size DEV_BSIZE) 1775 * a_runp - where to return the "run past" a_bn. This is the count of logical 1776 * blocks whose physical blocks (together with a_bn's physical block) 1777 * are contiguous. 1778 * a_runb - where to return the "run before" a_bn. 1779 */ 1780 static int 1781 msdosfs_bmap(struct vop_bmap_args *ap) 1782 { 1783 struct fatcache savefc; 1784 struct denode *dep; 1785 struct mount *mp; 1786 struct msdosfsmount *pmp; 1787 struct vnode *vp; 1788 daddr_t runbn; 1789 u_long cn; 1790 int bnpercn, error, maxio, maxrun, run; 1791 1792 vp = ap->a_vp; 1793 dep = VTODE(vp); 1794 pmp = dep->de_pmp; 1795 if (ap->a_bop != NULL) 1796 *ap->a_bop = &pmp->pm_devvp->v_bufobj; 1797 if (ap->a_bnp == NULL) 1798 return (0); 1799 if (ap->a_runp != NULL) 1800 *ap->a_runp = 0; 1801 if (ap->a_runb != NULL) 1802 *ap->a_runb = 0; 1803 cn = ap->a_bn; 1804 if (cn != ap->a_bn) 1805 return (EFBIG); 1806 error = pcbmap(dep, cn, ap->a_bnp, NULL, NULL); 1807 if (error != 0 || (ap->a_runp == NULL && ap->a_runb == NULL)) 1808 return (error); 1809 1810 /* 1811 * Prepare to back out updates of the fatchain cache after the one 1812 * for the first block done by pcbmap() above. Without the backout, 1813 * then whenever the caller doesn't do i/o to all of the blocks that 1814 * we find, the single useful cache entry would be too far in advance 1815 * of the actual i/o to work for the next sequential i/o. Then the 1816 * FAT would be searched from the beginning. With the backout, the 1817 * FAT is searched starting at most a few blocks early. This wastes 1818 * much less time. Time is also wasted finding more blocks than the 1819 * caller will do i/o to. This is necessary because the runlength 1820 * parameters are output-only. 1821 */ 1822 savefc = dep->de_fc[FC_LASTMAP]; 1823 1824 mp = vp->v_mount; 1825 maxio = mp->mnt_iosize_max / mp->mnt_stat.f_iosize; 1826 bnpercn = de_cn2bn(pmp, 1); 1827 if (ap->a_runp != NULL) { 1828 maxrun = ulmin(maxio - 1, pmp->pm_maxcluster - cn); 1829 for (run = 1; run <= maxrun; run++) { 1830 if (pcbmap(dep, cn + run, &runbn, NULL, NULL) != 0 || 1831 runbn != *ap->a_bnp + run * bnpercn) 1832 break; 1833 } 1834 *ap->a_runp = run - 1; 1835 } 1836 if (ap->a_runb != NULL) { 1837 maxrun = ulmin(maxio - 1, cn); 1838 for (run = 1; run < maxrun; run++) { 1839 if (pcbmap(dep, cn - run, &runbn, NULL, NULL) != 0 || 1840 runbn != *ap->a_bnp - run * bnpercn) 1841 break; 1842 } 1843 *ap->a_runb = run - 1; 1844 } 1845 dep->de_fc[FC_LASTMAP] = savefc; 1846 return (0); 1847 } 1848 1849 SYSCTL_NODE(_vfs, OID_AUTO, msdosfs, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 1850 "msdos filesystem"); 1851 static int use_buf_pager = 1; 1852 SYSCTL_INT(_vfs_msdosfs, OID_AUTO, use_buf_pager, CTLFLAG_RWTUN, 1853 &use_buf_pager, 0, 1854 "Use buffer pager instead of bmap"); 1855 1856 static daddr_t 1857 msdosfs_gbp_getblkno(struct vnode *vp, vm_ooffset_t off) 1858 { 1859 1860 return (de_cluster(VTODE(vp)->de_pmp, off)); 1861 } 1862 1863 static int 1864 msdosfs_gbp_getblksz(struct vnode *vp, daddr_t lbn) 1865 { 1866 1867 return (VTODE(vp)->de_pmp->pm_bpcluster); 1868 } 1869 1870 static int 1871 msdosfs_getpages(struct vop_getpages_args *ap) 1872 { 1873 1874 if (use_buf_pager) 1875 return (vfs_bio_getpages(ap->a_vp, ap->a_m, ap->a_count, 1876 ap->a_rbehind, ap->a_rahead, msdosfs_gbp_getblkno, 1877 msdosfs_gbp_getblksz)); 1878 return (vnode_pager_generic_getpages(ap->a_vp, ap->a_m, ap->a_count, 1879 ap->a_rbehind, ap->a_rahead, NULL, NULL)); 1880 } 1881 1882 static int 1883 msdosfs_strategy(struct vop_strategy_args *ap) 1884 { 1885 struct buf *bp = ap->a_bp; 1886 struct denode *dep = VTODE(ap->a_vp); 1887 struct bufobj *bo; 1888 int error = 0; 1889 daddr_t blkno; 1890 1891 /* 1892 * If we don't already know the filesystem relative block number 1893 * then get it using pcbmap(). If pcbmap() returns the block 1894 * number as -1 then we've got a hole in the file. DOS filesystems 1895 * don't allow files with holes, so we shouldn't ever see this. 1896 */ 1897 if (bp->b_blkno == bp->b_lblkno) { 1898 error = pcbmap(dep, bp->b_lblkno, &blkno, 0, 0); 1899 bp->b_blkno = blkno; 1900 if (error) { 1901 bp->b_error = error; 1902 bp->b_ioflags |= BIO_ERROR; 1903 bufdone(bp); 1904 return (0); 1905 } 1906 if ((long)bp->b_blkno == -1) 1907 vfs_bio_clrbuf(bp); 1908 } 1909 if (bp->b_blkno == -1) { 1910 bufdone(bp); 1911 return (0); 1912 } 1913 /* 1914 * Read/write the block from/to the disk that contains the desired 1915 * file block. 1916 */ 1917 bp->b_iooffset = dbtob(bp->b_blkno); 1918 bo = dep->de_pmp->pm_bo; 1919 BO_STRATEGY(bo, bp); 1920 return (0); 1921 } 1922 1923 static int 1924 msdosfs_print(struct vop_print_args *ap) 1925 { 1926 struct denode *dep = VTODE(ap->a_vp); 1927 1928 printf("\tstartcluster %lu, dircluster %lu, diroffset %lu, ", 1929 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset); 1930 printf("on dev %s\n", devtoname(dep->de_pmp->pm_dev)); 1931 return (0); 1932 } 1933 1934 static int 1935 msdosfs_pathconf(struct vop_pathconf_args *ap) 1936 { 1937 struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp; 1938 1939 switch (ap->a_name) { 1940 case _PC_FILESIZEBITS: 1941 *ap->a_retval = 32; 1942 return (0); 1943 case _PC_LINK_MAX: 1944 *ap->a_retval = 1; 1945 return (0); 1946 case _PC_NAME_MAX: 1947 *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12; 1948 return (0); 1949 case _PC_CHOWN_RESTRICTED: 1950 *ap->a_retval = 1; 1951 return (0); 1952 case _PC_NO_TRUNC: 1953 *ap->a_retval = 0; 1954 return (0); 1955 default: 1956 return (vop_stdpathconf(ap)); 1957 } 1958 /* NOTREACHED */ 1959 } 1960 1961 static int 1962 msdosfs_vptofh(struct vop_vptofh_args *ap) 1963 { 1964 struct denode *dep; 1965 struct defid *defhp; 1966 1967 dep = VTODE(ap->a_vp); 1968 defhp = (struct defid *)ap->a_fhp; 1969 defhp->defid_len = sizeof(struct defid); 1970 defhp->defid_dirclust = dep->de_dirclust; 1971 defhp->defid_dirofs = dep->de_diroffset; 1972 /* defhp->defid_gen = dep->de_gen; */ 1973 return (0); 1974 } 1975 1976 /* Global vfs data structures for msdosfs */ 1977 struct vop_vector msdosfs_vnodeops = { 1978 .vop_default = &default_vnodeops, 1979 1980 .vop_access = msdosfs_access, 1981 .vop_bmap = msdosfs_bmap, 1982 .vop_getpages = msdosfs_getpages, 1983 .vop_cachedlookup = msdosfs_lookup, 1984 .vop_open = msdosfs_open, 1985 .vop_close = msdosfs_close, 1986 .vop_create = msdosfs_create, 1987 .vop_fsync = msdosfs_fsync, 1988 .vop_fdatasync = vop_stdfdatasync_buf, 1989 .vop_getattr = msdosfs_getattr, 1990 .vop_inactive = msdosfs_inactive, 1991 .vop_link = msdosfs_link, 1992 .vop_lookup = vfs_cache_lookup, 1993 .vop_mkdir = msdosfs_mkdir, 1994 .vop_mknod = msdosfs_mknod, 1995 .vop_pathconf = msdosfs_pathconf, 1996 .vop_print = msdosfs_print, 1997 .vop_read = msdosfs_read, 1998 .vop_readdir = msdosfs_readdir, 1999 .vop_reclaim = msdosfs_reclaim, 2000 .vop_remove = msdosfs_remove, 2001 .vop_rename = msdosfs_rename, 2002 .vop_rmdir = msdosfs_rmdir, 2003 .vop_setattr = msdosfs_setattr, 2004 .vop_strategy = msdosfs_strategy, 2005 .vop_symlink = msdosfs_symlink, 2006 .vop_write = msdosfs_write, 2007 .vop_vptofh = msdosfs_vptofh, 2008 }; 2009 VFS_VOP_VECTOR_REGISTER(msdosfs_vnodeops); 2010