1 /* $FreeBSD$ */ 2 /* $NetBSD: msdosfs_vnops.c,v 1.68 1998/02/10 14:10:04 mrg Exp $ */ 3 4 /*- 5 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. 6 * Copyright (C) 1994, 1995, 1997 TooLs GmbH. 7 * All rights reserved. 8 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by TooLs GmbH. 21 * 4. The name of TooLs GmbH may not be used to endorse or promote products 22 * derived from this software without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 27 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 29 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 30 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 31 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 32 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 33 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 /*- 36 * Written by Paul Popelka (paulp@uts.amdahl.com) 37 * 38 * You can do anything you want with this software, just don't say you wrote 39 * it, and don't remove this notice. 40 * 41 * This software is provided "as is". 42 * 43 * The author supplies this software to be publicly redistributed on the 44 * understanding that the author is not responsible for the correct 45 * functioning of this software in any circumstances and is not liable for 46 * any damages caused by this software. 47 * 48 * October 1992 49 */ 50 51 #include <sys/param.h> 52 #include <sys/systm.h> 53 #include <sys/bio.h> 54 #include <sys/buf.h> 55 #include <sys/clock.h> 56 #include <sys/dirent.h> 57 #include <sys/lock.h> 58 #include <sys/lockf.h> 59 #include <sys/malloc.h> 60 #include <sys/mount.h> 61 #include <sys/mutex.h> 62 #include <sys/namei.h> 63 #include <sys/priv.h> 64 #include <sys/stat.h> 65 #include <sys/unistd.h> 66 #include <sys/vnode.h> 67 68 #include <vm/vm.h> 69 #include <vm/vm_extern.h> 70 71 #include <fs/msdosfs/bpb.h> 72 #include <fs/msdosfs/direntry.h> 73 #include <fs/msdosfs/denode.h> 74 #include <fs/msdosfs/fat.h> 75 #include <fs/msdosfs/msdosfsmount.h> 76 77 #define DOS_FILESIZE_MAX 0xffffffff 78 79 /* 80 * Prototypes for MSDOSFS vnode operations 81 */ 82 static vop_create_t msdosfs_create; 83 static vop_mknod_t msdosfs_mknod; 84 static vop_open_t msdosfs_open; 85 static vop_close_t msdosfs_close; 86 static vop_access_t msdosfs_access; 87 static vop_getattr_t msdosfs_getattr; 88 static vop_setattr_t msdosfs_setattr; 89 static vop_read_t msdosfs_read; 90 static vop_write_t msdosfs_write; 91 static vop_fsync_t msdosfs_fsync; 92 static vop_remove_t msdosfs_remove; 93 static vop_link_t msdosfs_link; 94 static vop_rename_t msdosfs_rename; 95 static vop_mkdir_t msdosfs_mkdir; 96 static vop_rmdir_t msdosfs_rmdir; 97 static vop_symlink_t msdosfs_symlink; 98 static vop_readdir_t msdosfs_readdir; 99 static vop_bmap_t msdosfs_bmap; 100 static vop_strategy_t msdosfs_strategy; 101 static vop_print_t msdosfs_print; 102 static vop_pathconf_t msdosfs_pathconf; 103 static vop_vptofh_t msdosfs_vptofh; 104 105 /* 106 * Some general notes: 107 * 108 * In the ufs filesystem the inodes, superblocks, and indirect blocks are 109 * read/written using the vnode for the filesystem. Blocks that represent 110 * the contents of a file are read/written using the vnode for the file 111 * (including directories when they are read/written as files). This 112 * presents problems for the dos filesystem because data that should be in 113 * an inode (if dos had them) resides in the directory itself. Since we 114 * must update directory entries without the benefit of having the vnode 115 * for the directory we must use the vnode for the filesystem. This means 116 * that when a directory is actually read/written (via read, write, or 117 * readdir, or seek) we must use the vnode for the filesystem instead of 118 * the vnode for the directory as would happen in ufs. This is to insure we 119 * retreive the correct block from the buffer cache since the hash value is 120 * based upon the vnode address and the desired block number. 121 */ 122 123 /* 124 * Create a regular file. On entry the directory to contain the file being 125 * created is locked. We must release before we return. We must also free 126 * the pathname buffer pointed at by cnp->cn_pnbuf, always on error, or 127 * only if the SAVESTART bit in cn_flags is clear on success. 128 */ 129 static int 130 msdosfs_create(ap) 131 struct vop_create_args /* { 132 struct vnode *a_dvp; 133 struct vnode **a_vpp; 134 struct componentname *a_cnp; 135 struct vattr *a_vap; 136 } */ *ap; 137 { 138 struct componentname *cnp = ap->a_cnp; 139 struct denode ndirent; 140 struct denode *dep; 141 struct denode *pdep = VTODE(ap->a_dvp); 142 struct timespec ts; 143 int error; 144 145 #ifdef MSDOSFS_DEBUG 146 printf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap); 147 #endif 148 149 /* 150 * If this is the root directory and there is no space left we 151 * can't do anything. This is because the root directory can not 152 * change size. 153 */ 154 if (pdep->de_StartCluster == MSDOSFSROOT 155 && pdep->de_fndoffset >= pdep->de_FileSize) { 156 error = ENOSPC; 157 goto bad; 158 } 159 160 /* 161 * Create a directory entry for the file, then call createde() to 162 * have it installed. NOTE: DOS files are always executable. We 163 * use the absence of the owner write bit to make the file 164 * readonly. 165 */ 166 #ifdef DIAGNOSTIC 167 if ((cnp->cn_flags & HASBUF) == 0) 168 panic("msdosfs_create: no name"); 169 #endif 170 bzero(&ndirent, sizeof(ndirent)); 171 error = uniqdosname(pdep, cnp, ndirent.de_Name); 172 if (error) 173 goto bad; 174 175 ndirent.de_Attributes = ATTR_ARCHIVE; 176 ndirent.de_LowerCase = 0; 177 ndirent.de_StartCluster = 0; 178 ndirent.de_FileSize = 0; 179 ndirent.de_pmp = pdep->de_pmp; 180 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 181 getnanotime(&ts); 182 DETIMES(&ndirent, &ts, &ts, &ts); 183 error = createde(&ndirent, pdep, &dep, cnp); 184 if (error) 185 goto bad; 186 *ap->a_vpp = DETOV(dep); 187 if ((cnp->cn_flags & MAKEENTRY) != 0) 188 cache_enter(ap->a_dvp, *ap->a_vpp, cnp); 189 return (0); 190 191 bad: 192 return (error); 193 } 194 195 static int 196 msdosfs_mknod(ap) 197 struct vop_mknod_args /* { 198 struct vnode *a_dvp; 199 struct vnode **a_vpp; 200 struct componentname *a_cnp; 201 struct vattr *a_vap; 202 } */ *ap; 203 { 204 205 return (EINVAL); 206 } 207 208 static int 209 msdosfs_open(ap) 210 struct vop_open_args /* { 211 struct vnode *a_vp; 212 int a_mode; 213 struct ucred *a_cred; 214 struct thread *a_td; 215 struct file *a_fp; 216 } */ *ap; 217 { 218 struct denode *dep = VTODE(ap->a_vp); 219 vnode_create_vobject(ap->a_vp, dep->de_FileSize, ap->a_td); 220 return 0; 221 } 222 223 static int 224 msdosfs_close(ap) 225 struct vop_close_args /* { 226 struct vnode *a_vp; 227 int a_fflag; 228 struct ucred *a_cred; 229 struct thread *a_td; 230 } */ *ap; 231 { 232 struct vnode *vp = ap->a_vp; 233 struct denode *dep = VTODE(vp); 234 struct timespec ts; 235 236 VI_LOCK(vp); 237 if (vp->v_usecount > 1) { 238 getnanotime(&ts); 239 DETIMES(dep, &ts, &ts, &ts); 240 } 241 VI_UNLOCK(vp); 242 return 0; 243 } 244 245 static int 246 msdosfs_access(ap) 247 struct vop_access_args /* { 248 struct vnode *a_vp; 249 accmode_t a_accmode; 250 struct ucred *a_cred; 251 struct thread *a_td; 252 } */ *ap; 253 { 254 struct vnode *vp = ap->a_vp; 255 struct denode *dep = VTODE(ap->a_vp); 256 struct msdosfsmount *pmp = dep->de_pmp; 257 mode_t file_mode; 258 accmode_t accmode = ap->a_accmode; 259 260 file_mode = S_IRWXU|S_IRWXG|S_IRWXO; 261 file_mode &= (vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); 262 263 /* 264 * Disallow writing to directories and regular files if the 265 * filesystem is read-only. 266 */ 267 if (accmode & VWRITE) { 268 switch (vp->v_type) { 269 case VREG: 270 case VDIR: 271 if (vp->v_mount->mnt_flag & MNT_RDONLY) 272 return (EROFS); 273 break; 274 default: 275 break; 276 } 277 } 278 279 return (vaccess(vp->v_type, file_mode, pmp->pm_uid, pmp->pm_gid, 280 ap->a_accmode, ap->a_cred, NULL)); 281 } 282 283 static int 284 msdosfs_getattr(ap) 285 struct vop_getattr_args /* { 286 struct vnode *a_vp; 287 struct vattr *a_vap; 288 struct ucred *a_cred; 289 } */ *ap; 290 { 291 struct denode *dep = VTODE(ap->a_vp); 292 struct msdosfsmount *pmp = dep->de_pmp; 293 struct vattr *vap = ap->a_vap; 294 mode_t mode; 295 struct timespec ts; 296 u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 297 uint64_t fileid; 298 299 getnanotime(&ts); 300 DETIMES(dep, &ts, &ts, &ts); 301 vap->va_fsid = dev2udev(pmp->pm_dev); 302 /* 303 * The following computation of the fileid must be the same as that 304 * used in msdosfs_readdir() to compute d_fileno. If not, pwd 305 * doesn't work. 306 */ 307 if (dep->de_Attributes & ATTR_DIRECTORY) { 308 fileid = (uint64_t)cntobn(pmp, dep->de_StartCluster) * 309 dirsperblk; 310 if (dep->de_StartCluster == MSDOSFSROOT) 311 fileid = 1; 312 } else { 313 fileid = (uint64_t)cntobn(pmp, dep->de_dirclust) * 314 dirsperblk; 315 if (dep->de_dirclust == MSDOSFSROOT) 316 fileid = (uint64_t)roottobn(pmp, 0) * dirsperblk; 317 fileid += (uoff_t)dep->de_diroffset / sizeof(struct direntry); 318 } 319 320 if (pmp->pm_flags & MSDOSFS_LARGEFS) 321 vap->va_fileid = msdosfs_fileno_map(pmp->pm_mountp, fileid); 322 else 323 vap->va_fileid = (long)fileid; 324 325 mode = S_IRWXU|S_IRWXG|S_IRWXO; 326 vap->va_mode = mode & 327 (ap->a_vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); 328 vap->va_uid = pmp->pm_uid; 329 vap->va_gid = pmp->pm_gid; 330 vap->va_nlink = 1; 331 vap->va_rdev = NODEV; 332 vap->va_size = dep->de_FileSize; 333 fattime2timespec(dep->de_MDate, dep->de_MTime, 0, 0, &vap->va_mtime); 334 vap->va_ctime = vap->va_mtime; 335 if (pmp->pm_flags & MSDOSFSMNT_LONGNAME) { 336 fattime2timespec(dep->de_ADate, 0, 0, 0, &vap->va_atime); 337 fattime2timespec(dep->de_CDate, dep->de_CTime, dep->de_CHun, 338 0, &vap->va_birthtime); 339 } else { 340 vap->va_atime = vap->va_mtime; 341 vap->va_birthtime.tv_sec = -1; 342 vap->va_birthtime.tv_nsec = 0; 343 } 344 vap->va_flags = 0; 345 if (dep->de_Attributes & ATTR_ARCHIVE) 346 vap->va_flags |= UF_ARCHIVE; 347 if (dep->de_Attributes & ATTR_HIDDEN) 348 vap->va_flags |= UF_HIDDEN; 349 if (dep->de_Attributes & ATTR_READONLY) 350 vap->va_flags |= UF_READONLY; 351 if (dep->de_Attributes & ATTR_SYSTEM) 352 vap->va_flags |= UF_SYSTEM; 353 vap->va_gen = 0; 354 vap->va_blocksize = pmp->pm_bpcluster; 355 vap->va_bytes = 356 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask; 357 vap->va_type = ap->a_vp->v_type; 358 vap->va_filerev = dep->de_modrev; 359 return (0); 360 } 361 362 static int 363 msdosfs_setattr(ap) 364 struct vop_setattr_args /* { 365 struct vnode *a_vp; 366 struct vattr *a_vap; 367 struct ucred *a_cred; 368 } */ *ap; 369 { 370 struct vnode *vp = ap->a_vp; 371 struct denode *dep = VTODE(ap->a_vp); 372 struct msdosfsmount *pmp = dep->de_pmp; 373 struct vattr *vap = ap->a_vap; 374 struct ucred *cred = ap->a_cred; 375 struct thread *td = curthread; 376 int error = 0; 377 378 #ifdef MSDOSFS_DEBUG 379 printf("msdosfs_setattr(): vp %p, vap %p, cred %p\n", 380 ap->a_vp, vap, cred); 381 #endif 382 383 /* 384 * Check for unsettable attributes. 385 */ 386 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 387 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 388 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 389 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 390 #ifdef MSDOSFS_DEBUG 391 printf("msdosfs_setattr(): returning EINVAL\n"); 392 printf(" va_type %d, va_nlink %x, va_fsid %lx, va_fileid %lx\n", 393 vap->va_type, vap->va_nlink, vap->va_fsid, vap->va_fileid); 394 printf(" va_blocksize %lx, va_rdev %x, va_bytes %qx, va_gen %lx\n", 395 vap->va_blocksize, vap->va_rdev, vap->va_bytes, vap->va_gen); 396 printf(" va_uid %x, va_gid %x\n", 397 vap->va_uid, vap->va_gid); 398 #endif 399 return (EINVAL); 400 } 401 402 /* 403 * We don't allow setting attributes on the root directory. 404 * The special case for the root directory is because before 405 * FAT32, the root directory didn't have an entry for itself 406 * (and was otherwise special). With FAT32, the root 407 * directory is not so special, but still doesn't have an 408 * entry for itself. 409 */ 410 if (vp->v_vflag & VV_ROOT) 411 return (EINVAL); 412 413 if (vap->va_flags != VNOVAL) { 414 if (vp->v_mount->mnt_flag & MNT_RDONLY) 415 return (EROFS); 416 if (cred->cr_uid != pmp->pm_uid) { 417 error = priv_check_cred(cred, PRIV_VFS_ADMIN, 0); 418 if (error) 419 return (error); 420 } 421 /* 422 * We are very inconsistent about handling unsupported 423 * attributes. We ignored the access time and the 424 * read and execute bits. We were strict for the other 425 * attributes. 426 */ 427 if (vap->va_flags & ~(UF_ARCHIVE | UF_HIDDEN | UF_READONLY | 428 UF_SYSTEM)) 429 return EOPNOTSUPP; 430 if (vap->va_flags & UF_ARCHIVE) 431 dep->de_Attributes |= ATTR_ARCHIVE; 432 else 433 dep->de_Attributes &= ~ATTR_ARCHIVE; 434 if (vap->va_flags & UF_HIDDEN) 435 dep->de_Attributes |= ATTR_HIDDEN; 436 else 437 dep->de_Attributes &= ~ATTR_HIDDEN; 438 /* We don't allow changing the readonly bit on directories. */ 439 if (vp->v_type != VDIR) { 440 if (vap->va_flags & UF_READONLY) 441 dep->de_Attributes |= ATTR_READONLY; 442 else 443 dep->de_Attributes &= ~ATTR_READONLY; 444 } 445 if (vap->va_flags & UF_SYSTEM) 446 dep->de_Attributes |= ATTR_SYSTEM; 447 else 448 dep->de_Attributes &= ~ATTR_SYSTEM; 449 dep->de_flag |= DE_MODIFIED; 450 } 451 452 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 453 uid_t uid; 454 gid_t gid; 455 456 if (vp->v_mount->mnt_flag & MNT_RDONLY) 457 return (EROFS); 458 uid = vap->va_uid; 459 if (uid == (uid_t)VNOVAL) 460 uid = pmp->pm_uid; 461 gid = vap->va_gid; 462 if (gid == (gid_t)VNOVAL) 463 gid = pmp->pm_gid; 464 if (cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid || 465 (gid != pmp->pm_gid && !groupmember(gid, cred))) { 466 error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0); 467 if (error) 468 return (error); 469 } 470 if (uid != pmp->pm_uid || gid != pmp->pm_gid) 471 return EINVAL; 472 } 473 474 if (vap->va_size != VNOVAL) { 475 switch (vp->v_type) { 476 case VDIR: 477 return (EISDIR); 478 case VREG: 479 /* 480 * Truncation is only supported for regular files, 481 * Disallow it if the filesystem is read-only. 482 */ 483 if (vp->v_mount->mnt_flag & MNT_RDONLY) 484 return (EROFS); 485 break; 486 default: 487 /* 488 * According to POSIX, the result is unspecified 489 * for file types other than regular files, 490 * directories and shared memory objects. We 491 * don't support any file types except regular 492 * files and directories in this file system, so 493 * this (default) case is unreachable and can do 494 * anything. Keep falling through to detrunc() 495 * for now. 496 */ 497 break; 498 } 499 error = detrunc(dep, vap->va_size, 0, cred); 500 if (error) 501 return error; 502 } 503 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 504 if (vp->v_mount->mnt_flag & MNT_RDONLY) 505 return (EROFS); 506 error = vn_utimes_perm(vp, vap, cred, td); 507 if (error != 0) 508 return (error); 509 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 && 510 vap->va_atime.tv_sec != VNOVAL) { 511 dep->de_flag &= ~DE_ACCESS; 512 timespec2fattime(&vap->va_atime, 0, 513 &dep->de_ADate, NULL, NULL); 514 } 515 if (vap->va_mtime.tv_sec != VNOVAL) { 516 dep->de_flag &= ~DE_UPDATE; 517 timespec2fattime(&vap->va_mtime, 0, 518 &dep->de_MDate, &dep->de_MTime, NULL); 519 } 520 /* 521 * We don't set the archive bit when modifying the time of 522 * a directory to emulate the Windows/DOS behavior. 523 */ 524 if (vp->v_type != VDIR) 525 dep->de_Attributes |= ATTR_ARCHIVE; 526 dep->de_flag |= DE_MODIFIED; 527 } 528 /* 529 * DOS files only have the ability to have their writability 530 * attribute set, so we use the owner write bit to set the readonly 531 * attribute. 532 */ 533 if (vap->va_mode != (mode_t)VNOVAL) { 534 if (vp->v_mount->mnt_flag & MNT_RDONLY) 535 return (EROFS); 536 if (cred->cr_uid != pmp->pm_uid) { 537 error = priv_check_cred(cred, PRIV_VFS_ADMIN, 0); 538 if (error) 539 return (error); 540 } 541 if (vp->v_type != VDIR) { 542 /* We ignore the read and execute bits. */ 543 if (vap->va_mode & VWRITE) 544 dep->de_Attributes &= ~ATTR_READONLY; 545 else 546 dep->de_Attributes |= ATTR_READONLY; 547 dep->de_Attributes |= ATTR_ARCHIVE; 548 dep->de_flag |= DE_MODIFIED; 549 } 550 } 551 return (deupdat(dep, 0)); 552 } 553 554 static int 555 msdosfs_read(ap) 556 struct vop_read_args /* { 557 struct vnode *a_vp; 558 struct uio *a_uio; 559 int a_ioflag; 560 struct ucred *a_cred; 561 } */ *ap; 562 { 563 int error = 0; 564 int blsize; 565 int isadir; 566 ssize_t orig_resid; 567 u_int n; 568 u_long diff; 569 u_long on; 570 daddr_t lbn; 571 daddr_t rablock; 572 int rasize; 573 int seqcount; 574 struct buf *bp; 575 struct vnode *vp = ap->a_vp; 576 struct denode *dep = VTODE(vp); 577 struct msdosfsmount *pmp = dep->de_pmp; 578 struct uio *uio = ap->a_uio; 579 580 /* 581 * If they didn't ask for any data, then we are done. 582 */ 583 orig_resid = uio->uio_resid; 584 if (orig_resid == 0) 585 return (0); 586 587 /* 588 * The caller is supposed to ensure that 589 * uio->uio_offset >= 0 and uio->uio_resid >= 0. 590 * We don't need to check for large offsets as in ffs because 591 * dep->de_FileSize <= DOS_FILESIZE_MAX < OFF_MAX, so large 592 * offsets cannot cause overflow even in theory. 593 */ 594 595 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 596 597 isadir = dep->de_Attributes & ATTR_DIRECTORY; 598 do { 599 if (uio->uio_offset >= dep->de_FileSize) 600 break; 601 lbn = de_cluster(pmp, uio->uio_offset); 602 rablock = lbn + 1; 603 blsize = pmp->pm_bpcluster; 604 on = uio->uio_offset & pmp->pm_crbomask; 605 /* 606 * If we are operating on a directory file then be sure to 607 * do i/o with the vnode for the filesystem instead of the 608 * vnode for the directory. 609 */ 610 if (isadir) { 611 /* convert cluster # to block # */ 612 error = pcbmap(dep, lbn, &lbn, 0, &blsize); 613 if (error == E2BIG) { 614 error = EINVAL; 615 break; 616 } else if (error) 617 break; 618 error = bread(pmp->pm_devvp, lbn, blsize, NOCRED, &bp); 619 } else if (de_cn2off(pmp, rablock) >= dep->de_FileSize) { 620 error = bread(vp, lbn, blsize, NOCRED, &bp); 621 } else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) { 622 error = cluster_read(vp, dep->de_FileSize, lbn, blsize, 623 NOCRED, on + uio->uio_resid, seqcount, 0, &bp); 624 } else if (seqcount > 1) { 625 rasize = blsize; 626 error = breadn(vp, lbn, 627 blsize, &rablock, &rasize, 1, NOCRED, &bp); 628 } else { 629 error = bread(vp, lbn, blsize, NOCRED, &bp); 630 } 631 if (error) { 632 brelse(bp); 633 break; 634 } 635 diff = pmp->pm_bpcluster - on; 636 n = diff > uio->uio_resid ? uio->uio_resid : diff; 637 diff = dep->de_FileSize - uio->uio_offset; 638 if (diff < n) 639 n = diff; 640 diff = blsize - bp->b_resid; 641 if (diff < n) 642 n = diff; 643 error = uiomove(bp->b_data + on, (int) n, uio); 644 brelse(bp); 645 } while (error == 0 && uio->uio_resid > 0 && n != 0); 646 if (!isadir && (error == 0 || uio->uio_resid != orig_resid) && 647 (vp->v_mount->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0) 648 dep->de_flag |= DE_ACCESS; 649 return (error); 650 } 651 652 /* 653 * Write data to a file or directory. 654 */ 655 static int 656 msdosfs_write(ap) 657 struct vop_write_args /* { 658 struct vnode *a_vp; 659 struct uio *a_uio; 660 int a_ioflag; 661 struct ucred *a_cred; 662 } */ *ap; 663 { 664 int n; 665 int croffset; 666 ssize_t resid; 667 u_long osize; 668 int error = 0; 669 u_long count; 670 int seqcount; 671 daddr_t bn, lastcn; 672 struct buf *bp; 673 int ioflag = ap->a_ioflag; 674 struct uio *uio = ap->a_uio; 675 struct vnode *vp = ap->a_vp; 676 struct vnode *thisvp; 677 struct denode *dep = VTODE(vp); 678 struct msdosfsmount *pmp = dep->de_pmp; 679 struct ucred *cred = ap->a_cred; 680 681 #ifdef MSDOSFS_DEBUG 682 printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n", 683 vp, uio, ioflag, cred); 684 printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n", 685 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster); 686 #endif 687 688 switch (vp->v_type) { 689 case VREG: 690 if (ioflag & IO_APPEND) 691 uio->uio_offset = dep->de_FileSize; 692 thisvp = vp; 693 break; 694 case VDIR: 695 return EISDIR; 696 default: 697 panic("msdosfs_write(): bad file type"); 698 } 699 700 /* 701 * This is needed (unlike in ffs_write()) because we extend the 702 * file outside of the loop but we don't want to extend the file 703 * for writes of 0 bytes. 704 */ 705 if (uio->uio_resid == 0) 706 return (0); 707 708 /* 709 * The caller is supposed to ensure that 710 * uio->uio_offset >= 0 and uio->uio_resid >= 0. 711 */ 712 if ((uoff_t)uio->uio_offset + uio->uio_resid > DOS_FILESIZE_MAX) 713 return (EFBIG); 714 715 /* 716 * If they've exceeded their filesize limit, tell them about it. 717 */ 718 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 719 return (EFBIG); 720 721 /* 722 * If the offset we are starting the write at is beyond the end of 723 * the file, then they've done a seek. Unix filesystems allow 724 * files with holes in them, DOS doesn't so we must fill the hole 725 * with zeroed blocks. 726 */ 727 if (uio->uio_offset > dep->de_FileSize) { 728 error = deextend(dep, uio->uio_offset, cred); 729 if (error) 730 return (error); 731 } 732 733 /* 734 * Remember some values in case the write fails. 735 */ 736 resid = uio->uio_resid; 737 osize = dep->de_FileSize; 738 739 /* 740 * If we write beyond the end of the file, extend it to its ultimate 741 * size ahead of the time to hopefully get a contiguous area. 742 */ 743 if (uio->uio_offset + resid > osize) { 744 count = de_clcount(pmp, uio->uio_offset + resid) - 745 de_clcount(pmp, osize); 746 error = extendfile(dep, count, NULL, NULL, 0); 747 if (error && (error != ENOSPC || (ioflag & IO_UNIT))) 748 goto errexit; 749 lastcn = dep->de_fc[FC_LASTFC].fc_frcn; 750 } else 751 lastcn = de_clcount(pmp, osize) - 1; 752 753 seqcount = ioflag >> IO_SEQSHIFT; 754 do { 755 if (de_cluster(pmp, uio->uio_offset) > lastcn) { 756 error = ENOSPC; 757 break; 758 } 759 760 croffset = uio->uio_offset & pmp->pm_crbomask; 761 n = min(uio->uio_resid, pmp->pm_bpcluster - croffset); 762 if (uio->uio_offset + n > dep->de_FileSize) { 763 dep->de_FileSize = uio->uio_offset + n; 764 /* The object size needs to be set before buffer is allocated */ 765 vnode_pager_setsize(vp, dep->de_FileSize); 766 } 767 768 bn = de_cluster(pmp, uio->uio_offset); 769 if ((uio->uio_offset & pmp->pm_crbomask) == 0 770 && (de_cluster(pmp, uio->uio_offset + uio->uio_resid) 771 > de_cluster(pmp, uio->uio_offset) 772 || uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) { 773 /* 774 * If either the whole cluster gets written, 775 * or we write the cluster from its start beyond EOF, 776 * then no need to read data from disk. 777 */ 778 bp = getblk(thisvp, bn, pmp->pm_bpcluster, 0, 0, 0); 779 vfs_bio_clrbuf(bp); 780 /* 781 * Do the bmap now, since pcbmap needs buffers 782 * for the fat table. (see msdosfs_strategy) 783 */ 784 if (bp->b_blkno == bp->b_lblkno) { 785 error = pcbmap(dep, bp->b_lblkno, &bn, 0, 0); 786 if (error) 787 bp->b_blkno = -1; 788 else 789 bp->b_blkno = bn; 790 } 791 if (bp->b_blkno == -1) { 792 brelse(bp); 793 if (!error) 794 error = EIO; /* XXX */ 795 break; 796 } 797 } else { 798 /* 799 * The block we need to write into exists, so read it in. 800 */ 801 error = bread(thisvp, bn, pmp->pm_bpcluster, cred, &bp); 802 if (error) { 803 brelse(bp); 804 break; 805 } 806 } 807 808 /* 809 * Should these vnode_pager_* functions be done on dir 810 * files? 811 */ 812 813 /* 814 * Copy the data from user space into the buf header. 815 */ 816 error = uiomove(bp->b_data + croffset, n, uio); 817 if (error) { 818 brelse(bp); 819 break; 820 } 821 822 /* Prepare for clustered writes in some else clauses. */ 823 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) 824 bp->b_flags |= B_CLUSTEROK; 825 826 /* 827 * If IO_SYNC, then each buffer is written synchronously. 828 * Otherwise, if we have a severe page deficiency then 829 * write the buffer asynchronously. Otherwise, if on a 830 * cluster boundary then write the buffer asynchronously, 831 * combining it with contiguous clusters if permitted and 832 * possible, since we don't expect more writes into this 833 * buffer soon. Otherwise, do a delayed write because we 834 * expect more writes into this buffer soon. 835 */ 836 if (ioflag & IO_SYNC) 837 (void)bwrite(bp); 838 else if (vm_page_count_severe() || buf_dirty_count_severe()) 839 bawrite(bp); 840 else if (n + croffset == pmp->pm_bpcluster) { 841 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) 842 cluster_write(vp, bp, dep->de_FileSize, 843 seqcount, 0); 844 else 845 bawrite(bp); 846 } else 847 bdwrite(bp); 848 dep->de_flag |= DE_UPDATE; 849 } while (error == 0 && uio->uio_resid > 0); 850 851 /* 852 * If the write failed and they want us to, truncate the file back 853 * to the size it was before the write was attempted. 854 */ 855 errexit: 856 if (error) { 857 if (ioflag & IO_UNIT) { 858 detrunc(dep, osize, ioflag & IO_SYNC, NOCRED); 859 uio->uio_offset -= resid - uio->uio_resid; 860 uio->uio_resid = resid; 861 } else { 862 detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC, NOCRED); 863 if (uio->uio_resid != resid) 864 error = 0; 865 } 866 } else if (ioflag & IO_SYNC) 867 error = deupdat(dep, 1); 868 return (error); 869 } 870 871 /* 872 * Flush the blocks of a file to disk. 873 */ 874 static int 875 msdosfs_fsync(ap) 876 struct vop_fsync_args /* { 877 struct vnode *a_vp; 878 struct ucred *a_cred; 879 int a_waitfor; 880 struct thread *a_td; 881 } */ *ap; 882 { 883 struct vnode *devvp; 884 int allerror, error; 885 886 vop_stdfsync(ap); 887 888 /* 889 * If the syncing request comes from fsync(2), sync the entire 890 * FAT and any other metadata that happens to be on devvp. We 891 * need this mainly for the FAT. We write the FAT sloppily, and 892 * syncing it all now is the best we can easily do to get all 893 * directory entries associated with the file (not just the file) 894 * fully synced. The other metadata includes critical metadata 895 * for all directory entries, but only in the MNT_ASYNC case. We 896 * will soon sync all metadata in the file's directory entry. 897 * Non-critical metadata for associated directory entries only 898 * gets synced accidentally, as in most file systems. 899 */ 900 if (ap->a_waitfor == MNT_WAIT) { 901 devvp = VTODE(ap->a_vp)->de_pmp->pm_devvp; 902 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 903 allerror = VOP_FSYNC(devvp, MNT_WAIT, ap->a_td); 904 VOP_UNLOCK(devvp, 0); 905 } else 906 allerror = 0; 907 908 error = deupdat(VTODE(ap->a_vp), ap->a_waitfor == MNT_WAIT); 909 if (allerror == 0) 910 allerror = error; 911 return (allerror); 912 } 913 914 static int 915 msdosfs_remove(ap) 916 struct vop_remove_args /* { 917 struct vnode *a_dvp; 918 struct vnode *a_vp; 919 struct componentname *a_cnp; 920 } */ *ap; 921 { 922 struct denode *dep = VTODE(ap->a_vp); 923 struct denode *ddep = VTODE(ap->a_dvp); 924 int error; 925 926 if (ap->a_vp->v_type == VDIR) 927 error = EPERM; 928 else 929 error = removede(ddep, dep); 930 #ifdef MSDOSFS_DEBUG 931 printf("msdosfs_remove(), dep %p, v_usecount %d\n", dep, ap->a_vp->v_usecount); 932 #endif 933 return (error); 934 } 935 936 /* 937 * DOS filesystems don't know what links are. 938 */ 939 static int 940 msdosfs_link(ap) 941 struct vop_link_args /* { 942 struct vnode *a_tdvp; 943 struct vnode *a_vp; 944 struct componentname *a_cnp; 945 } */ *ap; 946 { 947 return (EOPNOTSUPP); 948 } 949 950 /* 951 * Renames on files require moving the denode to a new hash queue since the 952 * denode's location is used to compute which hash queue to put the file 953 * in. Unless it is a rename in place. For example "mv a b". 954 * 955 * What follows is the basic algorithm: 956 * 957 * if (file move) { 958 * if (dest file exists) { 959 * remove dest file 960 * } 961 * if (dest and src in same directory) { 962 * rewrite name in existing directory slot 963 * } else { 964 * write new entry in dest directory 965 * update offset and dirclust in denode 966 * move denode to new hash chain 967 * clear old directory entry 968 * } 969 * } else { 970 * directory move 971 * if (dest directory exists) { 972 * if (dest is not empty) { 973 * return ENOTEMPTY 974 * } 975 * remove dest directory 976 * } 977 * if (dest and src in same directory) { 978 * rewrite name in existing entry 979 * } else { 980 * be sure dest is not a child of src directory 981 * write entry in dest directory 982 * update "." and ".." in moved directory 983 * clear old directory entry for moved directory 984 * } 985 * } 986 * 987 * On entry: 988 * source's parent directory is unlocked 989 * source file or directory is unlocked 990 * destination's parent directory is locked 991 * destination file or directory is locked if it exists 992 * 993 * On exit: 994 * all denodes should be released 995 */ 996 static int 997 msdosfs_rename(ap) 998 struct vop_rename_args /* { 999 struct vnode *a_fdvp; 1000 struct vnode *a_fvp; 1001 struct componentname *a_fcnp; 1002 struct vnode *a_tdvp; 1003 struct vnode *a_tvp; 1004 struct componentname *a_tcnp; 1005 } */ *ap; 1006 { 1007 struct vnode *tdvp = ap->a_tdvp; 1008 struct vnode *fvp = ap->a_fvp; 1009 struct vnode *fdvp = ap->a_fdvp; 1010 struct vnode *tvp = ap->a_tvp; 1011 struct componentname *tcnp = ap->a_tcnp; 1012 struct componentname *fcnp = ap->a_fcnp; 1013 struct denode *ip, *xp, *dp, *zp; 1014 u_char toname[12], oldname[11]; 1015 u_long from_diroffset, to_diroffset; 1016 u_char to_count; 1017 int doingdirectory = 0, newparent = 0; 1018 int error; 1019 u_long cn, pcl; 1020 daddr_t bn; 1021 struct denode *fddep; /* from file's parent directory */ 1022 struct msdosfsmount *pmp; 1023 struct direntry *dotdotp; 1024 struct buf *bp; 1025 1026 fddep = VTODE(ap->a_fdvp); 1027 pmp = fddep->de_pmp; 1028 1029 pmp = VFSTOMSDOSFS(fdvp->v_mount); 1030 1031 #ifdef DIAGNOSTIC 1032 if ((tcnp->cn_flags & HASBUF) == 0 || 1033 (fcnp->cn_flags & HASBUF) == 0) 1034 panic("msdosfs_rename: no name"); 1035 #endif 1036 /* 1037 * Check for cross-device rename. 1038 */ 1039 if (fvp->v_mount != tdvp->v_mount || 1040 (tvp && fvp->v_mount != tvp->v_mount)) { 1041 error = EXDEV; 1042 abortit: 1043 if (tdvp == tvp) 1044 vrele(tdvp); 1045 else 1046 vput(tdvp); 1047 if (tvp) 1048 vput(tvp); 1049 vrele(fdvp); 1050 vrele(fvp); 1051 return (error); 1052 } 1053 1054 /* 1055 * If source and dest are the same, do nothing. 1056 */ 1057 if (tvp == fvp) { 1058 error = 0; 1059 goto abortit; 1060 } 1061 1062 error = vn_lock(fvp, LK_EXCLUSIVE); 1063 if (error) 1064 goto abortit; 1065 dp = VTODE(fdvp); 1066 ip = VTODE(fvp); 1067 1068 /* 1069 * Be sure we are not renaming ".", "..", or an alias of ".". This 1070 * leads to a crippled directory tree. It's pretty tough to do a 1071 * "ls" or "pwd" with the "." directory entry missing, and "cd .." 1072 * doesn't work if the ".." entry is missing. 1073 */ 1074 if (ip->de_Attributes & ATTR_DIRECTORY) { 1075 /* 1076 * Avoid ".", "..", and aliases of "." for obvious reasons. 1077 */ 1078 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 1079 dp == ip || 1080 (fcnp->cn_flags & ISDOTDOT) || 1081 (tcnp->cn_flags & ISDOTDOT) || 1082 (ip->de_flag & DE_RENAME)) { 1083 VOP_UNLOCK(fvp, 0); 1084 error = EINVAL; 1085 goto abortit; 1086 } 1087 ip->de_flag |= DE_RENAME; 1088 doingdirectory++; 1089 } 1090 1091 /* 1092 * When the target exists, both the directory 1093 * and target vnodes are returned locked. 1094 */ 1095 dp = VTODE(tdvp); 1096 xp = tvp ? VTODE(tvp) : NULL; 1097 /* 1098 * Remember direntry place to use for destination 1099 */ 1100 to_diroffset = dp->de_fndoffset; 1101 to_count = dp->de_fndcnt; 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 VOP_UNLOCK(fvp, 0); 1115 if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster) 1116 newparent = 1; 1117 if (doingdirectory && newparent) { 1118 if (error) /* write access check above */ 1119 goto bad; 1120 if (xp != NULL) 1121 vput(tvp); 1122 /* 1123 * doscheckpath() vput()'s dp, 1124 * so we have to do a relookup afterwards 1125 */ 1126 error = doscheckpath(ip, dp); 1127 if (error) 1128 goto out; 1129 if ((tcnp->cn_flags & SAVESTART) == 0) 1130 panic("msdosfs_rename: lost to startdir"); 1131 error = relookup(tdvp, &tvp, tcnp); 1132 if (error) 1133 goto out; 1134 dp = VTODE(tdvp); 1135 xp = tvp ? VTODE(tvp) : NULL; 1136 } 1137 1138 if (xp != NULL) { 1139 /* 1140 * Target must be empty if a directory and have no links 1141 * to it. Also, ensure source and target are compatible 1142 * (both directories, or both not directories). 1143 */ 1144 if (xp->de_Attributes & ATTR_DIRECTORY) { 1145 if (!dosdirempty(xp)) { 1146 error = ENOTEMPTY; 1147 goto bad; 1148 } 1149 if (!doingdirectory) { 1150 error = ENOTDIR; 1151 goto bad; 1152 } 1153 cache_purge(tdvp); 1154 } else if (doingdirectory) { 1155 error = EISDIR; 1156 goto bad; 1157 } 1158 error = removede(dp, xp); 1159 if (error) 1160 goto bad; 1161 vput(tvp); 1162 xp = NULL; 1163 } 1164 1165 /* 1166 * Convert the filename in tcnp into a dos filename. We copy this 1167 * into the denode and directory entry for the destination 1168 * file/directory. 1169 */ 1170 error = uniqdosname(VTODE(tdvp), tcnp, toname); 1171 if (error) 1172 goto abortit; 1173 1174 /* 1175 * Since from wasn't locked at various places above, 1176 * have to do a relookup here. 1177 */ 1178 fcnp->cn_flags &= ~MODMASK; 1179 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 1180 if ((fcnp->cn_flags & SAVESTART) == 0) 1181 panic("msdosfs_rename: lost from startdir"); 1182 if (!newparent) 1183 VOP_UNLOCK(tdvp, 0); 1184 if (relookup(fdvp, &fvp, fcnp) == 0) 1185 vrele(fdvp); 1186 if (fvp == NULL) { 1187 /* 1188 * From name has disappeared. 1189 */ 1190 if (doingdirectory) 1191 panic("rename: lost dir entry"); 1192 if (newparent) 1193 VOP_UNLOCK(tdvp, 0); 1194 vrele(tdvp); 1195 vrele(ap->a_fvp); 1196 return 0; 1197 } 1198 xp = VTODE(fvp); 1199 zp = VTODE(fdvp); 1200 from_diroffset = zp->de_fndoffset; 1201 1202 /* 1203 * Ensure that the directory entry still exists and has not 1204 * changed till now. If the source is a file the entry may 1205 * have been unlinked or renamed. In either case there is 1206 * no further work to be done. If the source is a directory 1207 * then it cannot have been rmdir'ed or renamed; this is 1208 * prohibited by the DE_RENAME flag. 1209 */ 1210 if (xp != ip) { 1211 if (doingdirectory) 1212 panic("rename: lost dir entry"); 1213 VOP_UNLOCK(fvp, 0); 1214 if (newparent) 1215 VOP_UNLOCK(fdvp, 0); 1216 vrele(ap->a_fvp); 1217 xp = NULL; 1218 } else { 1219 vrele(fvp); 1220 xp = NULL; 1221 1222 /* 1223 * First write a new entry in the destination 1224 * directory and mark the entry in the source directory 1225 * as deleted. Then move the denode to the correct hash 1226 * chain for its new location in the filesystem. And, if 1227 * we moved a directory, then update its .. entry to point 1228 * to the new parent directory. 1229 */ 1230 bcopy(ip->de_Name, oldname, 11); 1231 bcopy(toname, ip->de_Name, 11); /* update denode */ 1232 dp->de_fndoffset = to_diroffset; 1233 dp->de_fndcnt = to_count; 1234 error = createde(ip, dp, (struct denode **)0, tcnp); 1235 if (error) { 1236 bcopy(oldname, ip->de_Name, 11); 1237 if (newparent) 1238 VOP_UNLOCK(fdvp, 0); 1239 VOP_UNLOCK(fvp, 0); 1240 goto bad; 1241 } 1242 /* 1243 * If ip is for a directory, then its name should always 1244 * be "." since it is for the directory entry in the 1245 * directory itself (msdosfs_lookup() always translates 1246 * to the "." entry so as to get a unique denode, except 1247 * for the root directory there are different 1248 * complications). However, we just corrupted its name 1249 * to pass the correct name to createde(). Undo this. 1250 */ 1251 if ((ip->de_Attributes & ATTR_DIRECTORY) != 0) 1252 bcopy(oldname, ip->de_Name, 11); 1253 ip->de_refcnt++; 1254 zp->de_fndoffset = from_diroffset; 1255 error = removede(zp, ip); 1256 if (error) { 1257 /* XXX should downgrade to ro here, fs is corrupt */ 1258 if (newparent) 1259 VOP_UNLOCK(fdvp, 0); 1260 VOP_UNLOCK(fvp, 0); 1261 goto bad; 1262 } 1263 if (!doingdirectory) { 1264 error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0, 1265 &ip->de_dirclust, 0); 1266 if (error) { 1267 /* XXX should downgrade to ro here, fs is corrupt */ 1268 if (newparent) 1269 VOP_UNLOCK(fdvp, 0); 1270 VOP_UNLOCK(fvp, 0); 1271 goto bad; 1272 } 1273 if (ip->de_dirclust == MSDOSFSROOT) 1274 ip->de_diroffset = to_diroffset; 1275 else 1276 ip->de_diroffset = to_diroffset & pmp->pm_crbomask; 1277 } 1278 reinsert(ip); 1279 if (newparent) 1280 VOP_UNLOCK(fdvp, 0); 1281 } 1282 1283 /* 1284 * If we moved a directory to a new parent directory, then we must 1285 * fixup the ".." entry in the moved directory. 1286 */ 1287 if (doingdirectory && newparent) { 1288 cn = ip->de_StartCluster; 1289 if (cn == MSDOSFSROOT) { 1290 /* this should never happen */ 1291 panic("msdosfs_rename(): updating .. in root directory?"); 1292 } else 1293 bn = cntobn(pmp, cn); 1294 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, 1295 NOCRED, &bp); 1296 if (error) { 1297 /* XXX should downgrade to ro here, fs is corrupt */ 1298 brelse(bp); 1299 VOP_UNLOCK(fvp, 0); 1300 goto bad; 1301 } 1302 dotdotp = (struct direntry *)bp->b_data + 1; 1303 pcl = dp->de_StartCluster; 1304 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1305 pcl = MSDOSFSROOT; 1306 putushort(dotdotp->deStartCluster, pcl); 1307 if (FAT32(pmp)) 1308 putushort(dotdotp->deHighClust, pcl >> 16); 1309 if (DOINGASYNC(fvp)) 1310 bdwrite(bp); 1311 else if ((error = bwrite(bp)) != 0) { 1312 /* XXX should downgrade to ro here, fs is corrupt */ 1313 VOP_UNLOCK(fvp, 0); 1314 goto bad; 1315 } 1316 } 1317 1318 /* 1319 * The msdosfs lookup is case insensitive. Several aliases may 1320 * be inserted for a single directory entry. As a consequnce, 1321 * name cache purge done by lookup for fvp when DELETE op for 1322 * namei is specified, might be not enough to expunge all 1323 * namecache entries that were installed for this direntry. 1324 */ 1325 cache_purge(fvp); 1326 VOP_UNLOCK(fvp, 0); 1327 bad: 1328 if (xp) 1329 vput(tvp); 1330 vput(tdvp); 1331 out: 1332 ip->de_flag &= ~DE_RENAME; 1333 vrele(fdvp); 1334 vrele(fvp); 1335 return (error); 1336 1337 } 1338 1339 static struct { 1340 struct direntry dot; 1341 struct direntry dotdot; 1342 } dosdirtemplate = { 1343 { ". ", /* the . entry */ 1344 ATTR_DIRECTORY, /* file attribute */ 1345 0, /* reserved */ 1346 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1347 { 0, 0 }, /* access date */ 1348 { 0, 0 }, /* high bits of start cluster */ 1349 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1350 { 0, 0 }, /* startcluster */ 1351 { 0, 0, 0, 0 } /* filesize */ 1352 }, 1353 { ".. ", /* the .. entry */ 1354 ATTR_DIRECTORY, /* file attribute */ 1355 0, /* reserved */ 1356 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1357 { 0, 0 }, /* access date */ 1358 { 0, 0 }, /* high bits of start cluster */ 1359 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1360 { 0, 0 }, /* startcluster */ 1361 { 0, 0, 0, 0 } /* filesize */ 1362 } 1363 }; 1364 1365 static int 1366 msdosfs_mkdir(ap) 1367 struct vop_mkdir_args /* { 1368 struct vnode *a_dvp; 1369 struct vnode **a_vpp; 1370 struvt componentname *a_cnp; 1371 struct vattr *a_vap; 1372 } */ *ap; 1373 { 1374 struct componentname *cnp = ap->a_cnp; 1375 struct denode *dep; 1376 struct denode *pdep = VTODE(ap->a_dvp); 1377 struct direntry *denp; 1378 struct msdosfsmount *pmp = pdep->de_pmp; 1379 struct buf *bp; 1380 u_long newcluster, pcl; 1381 int bn; 1382 int error; 1383 struct denode ndirent; 1384 struct timespec ts; 1385 1386 /* 1387 * If this is the root directory and there is no space left we 1388 * can't do anything. This is because the root directory can not 1389 * change size. 1390 */ 1391 if (pdep->de_StartCluster == MSDOSFSROOT 1392 && pdep->de_fndoffset >= pdep->de_FileSize) { 1393 error = ENOSPC; 1394 goto bad2; 1395 } 1396 1397 /* 1398 * Allocate a cluster to hold the about to be created directory. 1399 */ 1400 error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL); 1401 if (error) 1402 goto bad2; 1403 1404 bzero(&ndirent, sizeof(ndirent)); 1405 ndirent.de_pmp = pmp; 1406 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 1407 getnanotime(&ts); 1408 DETIMES(&ndirent, &ts, &ts, &ts); 1409 1410 /* 1411 * Now fill the cluster with the "." and ".." entries. And write 1412 * the cluster to disk. This way it is there for the parent 1413 * directory to be pointing at if there were a crash. 1414 */ 1415 bn = cntobn(pmp, newcluster); 1416 /* always succeeds */ 1417 bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0, 0); 1418 bzero(bp->b_data, pmp->pm_bpcluster); 1419 bcopy(&dosdirtemplate, bp->b_data, sizeof dosdirtemplate); 1420 denp = (struct direntry *)bp->b_data; 1421 putushort(denp[0].deStartCluster, newcluster); 1422 putushort(denp[0].deCDate, ndirent.de_CDate); 1423 putushort(denp[0].deCTime, ndirent.de_CTime); 1424 denp[0].deCHundredth = ndirent.de_CHun; 1425 putushort(denp[0].deADate, ndirent.de_ADate); 1426 putushort(denp[0].deMDate, ndirent.de_MDate); 1427 putushort(denp[0].deMTime, ndirent.de_MTime); 1428 pcl = pdep->de_StartCluster; 1429 /* 1430 * Although the root directory has a non-magic starting cluster 1431 * number for FAT32, chkdsk and fsck_msdosfs still require 1432 * references to it in dotdot entries to be magic. 1433 */ 1434 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1435 pcl = MSDOSFSROOT; 1436 putushort(denp[1].deStartCluster, pcl); 1437 putushort(denp[1].deCDate, ndirent.de_CDate); 1438 putushort(denp[1].deCTime, ndirent.de_CTime); 1439 denp[1].deCHundredth = ndirent.de_CHun; 1440 putushort(denp[1].deADate, ndirent.de_ADate); 1441 putushort(denp[1].deMDate, ndirent.de_MDate); 1442 putushort(denp[1].deMTime, ndirent.de_MTime); 1443 if (FAT32(pmp)) { 1444 putushort(denp[0].deHighClust, newcluster >> 16); 1445 putushort(denp[1].deHighClust, pcl >> 16); 1446 } 1447 1448 if (DOINGASYNC(ap->a_dvp)) 1449 bdwrite(bp); 1450 else if ((error = bwrite(bp)) != 0) 1451 goto bad; 1452 1453 /* 1454 * Now build up a directory entry pointing to the newly allocated 1455 * cluster. This will be written to an empty slot in the parent 1456 * directory. 1457 */ 1458 #ifdef DIAGNOSTIC 1459 if ((cnp->cn_flags & HASBUF) == 0) 1460 panic("msdosfs_mkdir: no name"); 1461 #endif 1462 error = uniqdosname(pdep, cnp, ndirent.de_Name); 1463 if (error) 1464 goto bad; 1465 1466 ndirent.de_Attributes = ATTR_DIRECTORY; 1467 ndirent.de_LowerCase = 0; 1468 ndirent.de_StartCluster = newcluster; 1469 ndirent.de_FileSize = 0; 1470 error = createde(&ndirent, pdep, &dep, cnp); 1471 if (error) 1472 goto bad; 1473 *ap->a_vpp = DETOV(dep); 1474 return (0); 1475 1476 bad: 1477 clusterfree(pmp, newcluster, NULL); 1478 bad2: 1479 return (error); 1480 } 1481 1482 static int 1483 msdosfs_rmdir(ap) 1484 struct vop_rmdir_args /* { 1485 struct vnode *a_dvp; 1486 struct vnode *a_vp; 1487 struct componentname *a_cnp; 1488 } */ *ap; 1489 { 1490 struct vnode *vp = ap->a_vp; 1491 struct vnode *dvp = ap->a_dvp; 1492 struct componentname *cnp = ap->a_cnp; 1493 struct denode *ip, *dp; 1494 int error; 1495 1496 ip = VTODE(vp); 1497 dp = VTODE(dvp); 1498 1499 /* 1500 * Verify the directory is empty (and valid). 1501 * (Rmdir ".." won't be valid since 1502 * ".." will contain a reference to 1503 * the current directory and thus be 1504 * non-empty.) 1505 */ 1506 error = 0; 1507 if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) { 1508 error = ENOTEMPTY; 1509 goto out; 1510 } 1511 /* 1512 * Delete the entry from the directory. For dos filesystems this 1513 * gets rid of the directory entry on disk, the in memory copy 1514 * still exists but the de_refcnt is <= 0. This prevents it from 1515 * being found by deget(). When the vput() on dep is done we give 1516 * up access and eventually msdosfs_reclaim() will be called which 1517 * will remove it from the denode cache. 1518 */ 1519 error = removede(dp, ip); 1520 if (error) 1521 goto out; 1522 /* 1523 * This is where we decrement the link count in the parent 1524 * directory. Since dos filesystems don't do this we just purge 1525 * the name cache. 1526 */ 1527 cache_purge(dvp); 1528 /* 1529 * Truncate the directory that is being deleted. 1530 */ 1531 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred); 1532 cache_purge(vp); 1533 1534 out: 1535 return (error); 1536 } 1537 1538 /* 1539 * DOS filesystems don't know what symlinks are. 1540 */ 1541 static int 1542 msdosfs_symlink(ap) 1543 struct vop_symlink_args /* { 1544 struct vnode *a_dvp; 1545 struct vnode **a_vpp; 1546 struct componentname *a_cnp; 1547 struct vattr *a_vap; 1548 char *a_target; 1549 } */ *ap; 1550 { 1551 return (EOPNOTSUPP); 1552 } 1553 1554 static int 1555 msdosfs_readdir(ap) 1556 struct vop_readdir_args /* { 1557 struct vnode *a_vp; 1558 struct uio *a_uio; 1559 struct ucred *a_cred; 1560 int *a_eofflag; 1561 int *a_ncookies; 1562 u_long **a_cookies; 1563 } */ *ap; 1564 { 1565 struct mbnambuf nb; 1566 int error = 0; 1567 int diff; 1568 long n; 1569 int blsize; 1570 long on; 1571 u_long cn; 1572 uint64_t fileno; 1573 u_long dirsperblk; 1574 long bias = 0; 1575 daddr_t bn, lbn; 1576 struct buf *bp; 1577 struct denode *dep = VTODE(ap->a_vp); 1578 struct msdosfsmount *pmp = dep->de_pmp; 1579 struct direntry *dentp; 1580 struct dirent dirbuf; 1581 struct uio *uio = ap->a_uio; 1582 u_long *cookies = NULL; 1583 int ncookies = 0; 1584 off_t offset, off; 1585 int chksum = -1; 1586 1587 #ifdef MSDOSFS_DEBUG 1588 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n", 1589 ap->a_vp, uio, ap->a_cred, ap->a_eofflag); 1590 #endif 1591 1592 /* 1593 * msdosfs_readdir() won't operate properly on regular files since 1594 * it does i/o only with the filesystem vnode, and hence can 1595 * retrieve the wrong block from the buffer cache for a plain file. 1596 * So, fail attempts to readdir() on a plain file. 1597 */ 1598 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) 1599 return (ENOTDIR); 1600 1601 /* 1602 * To be safe, initialize dirbuf 1603 */ 1604 bzero(dirbuf.d_name, sizeof(dirbuf.d_name)); 1605 1606 /* 1607 * If the user buffer is smaller than the size of one dos directory 1608 * entry or the file offset is not a multiple of the size of a 1609 * directory entry, then we fail the read. 1610 */ 1611 off = offset = uio->uio_offset; 1612 if (uio->uio_resid < sizeof(struct direntry) || 1613 (offset & (sizeof(struct direntry) - 1))) 1614 return (EINVAL); 1615 1616 if (ap->a_ncookies) { 1617 ncookies = uio->uio_resid / 16; 1618 cookies = malloc(ncookies * sizeof(u_long), M_TEMP, 1619 M_WAITOK); 1620 *ap->a_cookies = cookies; 1621 *ap->a_ncookies = ncookies; 1622 } 1623 1624 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 1625 1626 /* 1627 * If they are reading from the root directory then, we simulate 1628 * the . and .. entries since these don't exist in the root 1629 * directory. We also set the offset bias to make up for having to 1630 * simulate these entries. By this I mean that at file offset 64 we 1631 * read the first entry in the root directory that lives on disk. 1632 */ 1633 if (dep->de_StartCluster == MSDOSFSROOT 1634 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) { 1635 #if 0 1636 printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n", 1637 offset); 1638 #endif 1639 bias = 2 * sizeof(struct direntry); 1640 if (offset < bias) { 1641 for (n = (int)offset / sizeof(struct direntry); 1642 n < 2; n++) { 1643 if (FAT32(pmp)) 1644 fileno = (uint64_t)cntobn(pmp, 1645 pmp->pm_rootdirblk) 1646 * dirsperblk; 1647 else 1648 fileno = 1; 1649 if (pmp->pm_flags & MSDOSFS_LARGEFS) { 1650 dirbuf.d_fileno = 1651 msdosfs_fileno_map(pmp->pm_mountp, 1652 fileno); 1653 } else { 1654 1655 dirbuf.d_fileno = (uint32_t)fileno; 1656 } 1657 dirbuf.d_type = DT_DIR; 1658 switch (n) { 1659 case 0: 1660 dirbuf.d_namlen = 1; 1661 strcpy(dirbuf.d_name, "."); 1662 break; 1663 case 1: 1664 dirbuf.d_namlen = 2; 1665 strcpy(dirbuf.d_name, ".."); 1666 break; 1667 } 1668 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1669 if (uio->uio_resid < dirbuf.d_reclen) 1670 goto out; 1671 error = uiomove(&dirbuf, dirbuf.d_reclen, uio); 1672 if (error) 1673 goto out; 1674 offset += sizeof(struct direntry); 1675 off = offset; 1676 if (cookies) { 1677 *cookies++ = offset; 1678 if (--ncookies <= 0) 1679 goto out; 1680 } 1681 } 1682 } 1683 } 1684 1685 mbnambuf_init(&nb); 1686 off = offset; 1687 while (uio->uio_resid > 0) { 1688 lbn = de_cluster(pmp, offset - bias); 1689 on = (offset - bias) & pmp->pm_crbomask; 1690 n = min(pmp->pm_bpcluster - on, uio->uio_resid); 1691 diff = dep->de_FileSize - (offset - bias); 1692 if (diff <= 0) 1693 break; 1694 n = min(n, diff); 1695 error = pcbmap(dep, lbn, &bn, &cn, &blsize); 1696 if (error) 1697 break; 1698 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp); 1699 if (error) { 1700 brelse(bp); 1701 return (error); 1702 } 1703 n = min(n, blsize - bp->b_resid); 1704 if (n == 0) { 1705 brelse(bp); 1706 return (EIO); 1707 } 1708 1709 /* 1710 * Convert from dos directory entries to fs-independent 1711 * directory entries. 1712 */ 1713 for (dentp = (struct direntry *)(bp->b_data + on); 1714 (char *)dentp < bp->b_data + on + n; 1715 dentp++, offset += sizeof(struct direntry)) { 1716 #if 0 1717 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n", 1718 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes); 1719 #endif 1720 /* 1721 * If this is an unused entry, we can stop. 1722 */ 1723 if (dentp->deName[0] == SLOT_EMPTY) { 1724 brelse(bp); 1725 goto out; 1726 } 1727 /* 1728 * Skip deleted entries. 1729 */ 1730 if (dentp->deName[0] == SLOT_DELETED) { 1731 chksum = -1; 1732 mbnambuf_init(&nb); 1733 continue; 1734 } 1735 1736 /* 1737 * Handle Win95 long directory entries 1738 */ 1739 if (dentp->deAttributes == ATTR_WIN95) { 1740 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) 1741 continue; 1742 chksum = win2unixfn(&nb, 1743 (struct winentry *)dentp, chksum, pmp); 1744 continue; 1745 } 1746 1747 /* 1748 * Skip volume labels 1749 */ 1750 if (dentp->deAttributes & ATTR_VOLUME) { 1751 chksum = -1; 1752 mbnambuf_init(&nb); 1753 continue; 1754 } 1755 /* 1756 * This computation of d_fileno must match 1757 * the computation of va_fileid in 1758 * msdosfs_getattr. 1759 */ 1760 if (dentp->deAttributes & ATTR_DIRECTORY) { 1761 fileno = getushort(dentp->deStartCluster); 1762 if (FAT32(pmp)) 1763 fileno |= getushort(dentp->deHighClust) << 16; 1764 /* if this is the root directory */ 1765 if (fileno == MSDOSFSROOT) 1766 if (FAT32(pmp)) 1767 fileno = (uint64_t)cntobn(pmp, 1768 pmp->pm_rootdirblk) 1769 * dirsperblk; 1770 else 1771 fileno = 1; 1772 else 1773 fileno = (uint64_t)cntobn(pmp, fileno) * 1774 dirsperblk; 1775 dirbuf.d_type = DT_DIR; 1776 } else { 1777 fileno = (uoff_t)offset / 1778 sizeof(struct direntry); 1779 dirbuf.d_type = DT_REG; 1780 } 1781 if (pmp->pm_flags & MSDOSFS_LARGEFS) { 1782 dirbuf.d_fileno = 1783 msdosfs_fileno_map(pmp->pm_mountp, fileno); 1784 } else 1785 dirbuf.d_fileno = (uint32_t)fileno; 1786 1787 if (chksum != winChksum(dentp->deName)) { 1788 dirbuf.d_namlen = dos2unixfn(dentp->deName, 1789 (u_char *)dirbuf.d_name, 1790 dentp->deLowerCase | 1791 ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ? 1792 (LCASE_BASE | LCASE_EXT) : 0), 1793 pmp); 1794 mbnambuf_init(&nb); 1795 } else 1796 mbnambuf_flush(&nb, &dirbuf); 1797 chksum = -1; 1798 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1799 if (uio->uio_resid < dirbuf.d_reclen) { 1800 brelse(bp); 1801 goto out; 1802 } 1803 error = uiomove(&dirbuf, dirbuf.d_reclen, uio); 1804 if (error) { 1805 brelse(bp); 1806 goto out; 1807 } 1808 if (cookies) { 1809 *cookies++ = offset + sizeof(struct direntry); 1810 if (--ncookies <= 0) { 1811 brelse(bp); 1812 goto out; 1813 } 1814 } 1815 off = offset + sizeof(struct direntry); 1816 } 1817 brelse(bp); 1818 } 1819 out: 1820 /* Subtract unused cookies */ 1821 if (ap->a_ncookies) 1822 *ap->a_ncookies -= ncookies; 1823 1824 uio->uio_offset = off; 1825 1826 /* 1827 * Set the eofflag (NFS uses it) 1828 */ 1829 if (ap->a_eofflag) { 1830 if (dep->de_FileSize - (offset - bias) <= 0) 1831 *ap->a_eofflag = 1; 1832 else 1833 *ap->a_eofflag = 0; 1834 } 1835 return (error); 1836 } 1837 1838 /*- 1839 * a_vp - pointer to the file's vnode 1840 * a_bn - logical block number within the file (cluster number for us) 1841 * a_bop - where to return the bufobj of the special file containing the fs 1842 * a_bnp - where to return the "physical" block number corresponding to a_bn 1843 * (relative to the special file; units are blocks of size DEV_BSIZE) 1844 * a_runp - where to return the "run past" a_bn. This is the count of logical 1845 * blocks whose physical blocks (together with a_bn's physical block) 1846 * are contiguous. 1847 * a_runb - where to return the "run before" a_bn. 1848 */ 1849 static int 1850 msdosfs_bmap(ap) 1851 struct vop_bmap_args /* { 1852 struct vnode *a_vp; 1853 daddr_t a_bn; 1854 struct bufobj **a_bop; 1855 daddr_t *a_bnp; 1856 int *a_runp; 1857 int *a_runb; 1858 } */ *ap; 1859 { 1860 struct denode *dep; 1861 struct mount *mp; 1862 struct msdosfsmount *pmp; 1863 struct vnode *vp; 1864 daddr_t runbn; 1865 u_long cn; 1866 int bnpercn, error, maxio, maxrun, run; 1867 1868 vp = ap->a_vp; 1869 dep = VTODE(vp); 1870 pmp = dep->de_pmp; 1871 if (ap->a_bop != NULL) 1872 *ap->a_bop = &pmp->pm_devvp->v_bufobj; 1873 if (ap->a_bnp == NULL) 1874 return (0); 1875 if (ap->a_runp != NULL) 1876 *ap->a_runp = 0; 1877 if (ap->a_runb != NULL) 1878 *ap->a_runb = 0; 1879 cn = ap->a_bn; 1880 if (cn != ap->a_bn) 1881 return (EFBIG); 1882 error = pcbmap(dep, cn, ap->a_bnp, NULL, NULL); 1883 if (error != 0 || (ap->a_runp == NULL && ap->a_runb == NULL)) 1884 return (error); 1885 1886 mp = vp->v_mount; 1887 maxio = mp->mnt_iosize_max / mp->mnt_stat.f_iosize; 1888 bnpercn = de_cn2bn(pmp, 1); 1889 if (ap->a_runp != NULL) { 1890 maxrun = ulmin(maxio - 1, pmp->pm_maxcluster - cn); 1891 for (run = 1; run <= maxrun; run++) { 1892 if (pcbmap(dep, cn + run, &runbn, NULL, NULL) != 0 || 1893 runbn != *ap->a_bnp + run * bnpercn) 1894 break; 1895 } 1896 *ap->a_runp = run - 1; 1897 } 1898 if (ap->a_runb != NULL) { 1899 maxrun = ulmin(maxio - 1, cn); 1900 for (run = 1; run < maxrun; run++) { 1901 if (pcbmap(dep, cn - run, &runbn, NULL, NULL) != 0 || 1902 runbn != *ap->a_bnp - run * bnpercn) 1903 break; 1904 } 1905 *ap->a_runb = run - 1; 1906 } 1907 return (0); 1908 } 1909 1910 static int 1911 msdosfs_strategy(ap) 1912 struct vop_strategy_args /* { 1913 struct vnode *a_vp; 1914 struct buf *a_bp; 1915 } */ *ap; 1916 { 1917 struct buf *bp = ap->a_bp; 1918 struct denode *dep = VTODE(ap->a_vp); 1919 struct bufobj *bo; 1920 int error = 0; 1921 daddr_t blkno; 1922 1923 /* 1924 * If we don't already know the filesystem relative block number 1925 * then get it using pcbmap(). If pcbmap() returns the block 1926 * number as -1 then we've got a hole in the file. DOS filesystems 1927 * don't allow files with holes, so we shouldn't ever see this. 1928 */ 1929 if (bp->b_blkno == bp->b_lblkno) { 1930 error = pcbmap(dep, bp->b_lblkno, &blkno, 0, 0); 1931 bp->b_blkno = blkno; 1932 if (error) { 1933 bp->b_error = error; 1934 bp->b_ioflags |= BIO_ERROR; 1935 bufdone(bp); 1936 return (0); 1937 } 1938 if ((long)bp->b_blkno == -1) 1939 vfs_bio_clrbuf(bp); 1940 } 1941 if (bp->b_blkno == -1) { 1942 bufdone(bp); 1943 return (0); 1944 } 1945 /* 1946 * Read/write the block from/to the disk that contains the desired 1947 * file block. 1948 */ 1949 bp->b_iooffset = dbtob(bp->b_blkno); 1950 bo = dep->de_pmp->pm_bo; 1951 BO_STRATEGY(bo, bp); 1952 return (0); 1953 } 1954 1955 static int 1956 msdosfs_print(ap) 1957 struct vop_print_args /* { 1958 struct vnode *vp; 1959 } */ *ap; 1960 { 1961 struct denode *dep = VTODE(ap->a_vp); 1962 1963 printf("\tstartcluster %lu, dircluster %lu, diroffset %lu, ", 1964 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset); 1965 printf("on dev %s\n", devtoname(dep->de_pmp->pm_dev)); 1966 return (0); 1967 } 1968 1969 static int 1970 msdosfs_pathconf(ap) 1971 struct vop_pathconf_args /* { 1972 struct vnode *a_vp; 1973 int a_name; 1974 int *a_retval; 1975 } */ *ap; 1976 { 1977 struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp; 1978 1979 switch (ap->a_name) { 1980 case _PC_LINK_MAX: 1981 *ap->a_retval = 1; 1982 return (0); 1983 case _PC_NAME_MAX: 1984 *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12; 1985 return (0); 1986 case _PC_PATH_MAX: 1987 *ap->a_retval = PATH_MAX; 1988 return (0); 1989 case _PC_CHOWN_RESTRICTED: 1990 *ap->a_retval = 1; 1991 return (0); 1992 case _PC_NO_TRUNC: 1993 *ap->a_retval = 0; 1994 return (0); 1995 default: 1996 return (EINVAL); 1997 } 1998 /* NOTREACHED */ 1999 } 2000 2001 static int 2002 msdosfs_vptofh(ap) 2003 struct vop_vptofh_args /* { 2004 struct vnode *a_vp; 2005 struct fid *a_fhp; 2006 } */ *ap; 2007 { 2008 struct denode *dep; 2009 struct defid *defhp; 2010 2011 dep = VTODE(ap->a_vp); 2012 defhp = (struct defid *)ap->a_fhp; 2013 defhp->defid_len = sizeof(struct defid); 2014 defhp->defid_dirclust = dep->de_dirclust; 2015 defhp->defid_dirofs = dep->de_diroffset; 2016 /* defhp->defid_gen = dep->de_gen; */ 2017 return (0); 2018 } 2019 2020 /* Global vfs data structures for msdosfs */ 2021 struct vop_vector msdosfs_vnodeops = { 2022 .vop_default = &default_vnodeops, 2023 2024 .vop_access = msdosfs_access, 2025 .vop_bmap = msdosfs_bmap, 2026 .vop_cachedlookup = msdosfs_lookup, 2027 .vop_open = msdosfs_open, 2028 .vop_close = msdosfs_close, 2029 .vop_create = msdosfs_create, 2030 .vop_fsync = msdosfs_fsync, 2031 .vop_getattr = msdosfs_getattr, 2032 .vop_inactive = msdosfs_inactive, 2033 .vop_link = msdosfs_link, 2034 .vop_lookup = vfs_cache_lookup, 2035 .vop_mkdir = msdosfs_mkdir, 2036 .vop_mknod = msdosfs_mknod, 2037 .vop_pathconf = msdosfs_pathconf, 2038 .vop_print = msdosfs_print, 2039 .vop_read = msdosfs_read, 2040 .vop_readdir = msdosfs_readdir, 2041 .vop_reclaim = msdosfs_reclaim, 2042 .vop_remove = msdosfs_remove, 2043 .vop_rename = msdosfs_rename, 2044 .vop_rmdir = msdosfs_rmdir, 2045 .vop_setattr = msdosfs_setattr, 2046 .vop_strategy = msdosfs_strategy, 2047 .vop_symlink = msdosfs_symlink, 2048 .vop_write = msdosfs_write, 2049 .vop_vptofh = msdosfs_vptofh, 2050 }; 2051