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sys/fs/msdosfs/msdosfs_vnops.c
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1 /* $FreeBSD: releng/10.0/sys/fs/msdosfs/msdosfs_vnops.c 254627 2013-08-21 23:04:48Z ken $ */ 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 return (0); 188 189 bad: 190 return (error); 191 } 192 193 static int 194 msdosfs_mknod(ap) 195 struct vop_mknod_args /* { 196 struct vnode *a_dvp; 197 struct vnode **a_vpp; 198 struct componentname *a_cnp; 199 struct vattr *a_vap; 200 } */ *ap; 201 { 202 203 return (EINVAL); 204 } 205 206 static int 207 msdosfs_open(ap) 208 struct vop_open_args /* { 209 struct vnode *a_vp; 210 int a_mode; 211 struct ucred *a_cred; 212 struct thread *a_td; 213 struct file *a_fp; 214 } */ *ap; 215 { 216 struct denode *dep = VTODE(ap->a_vp); 217 vnode_create_vobject(ap->a_vp, dep->de_FileSize, ap->a_td); 218 return 0; 219 } 220 221 static int 222 msdosfs_close(ap) 223 struct vop_close_args /* { 224 struct vnode *a_vp; 225 int a_fflag; 226 struct ucred *a_cred; 227 struct thread *a_td; 228 } */ *ap; 229 { 230 struct vnode *vp = ap->a_vp; 231 struct denode *dep = VTODE(vp); 232 struct timespec ts; 233 234 VI_LOCK(vp); 235 if (vp->v_usecount > 1) { 236 getnanotime(&ts); 237 DETIMES(dep, &ts, &ts, &ts); 238 } 239 VI_UNLOCK(vp); 240 return 0; 241 } 242 243 static int 244 msdosfs_access(ap) 245 struct vop_access_args /* { 246 struct vnode *a_vp; 247 accmode_t a_accmode; 248 struct ucred *a_cred; 249 struct thread *a_td; 250 } */ *ap; 251 { 252 struct vnode *vp = ap->a_vp; 253 struct denode *dep = VTODE(ap->a_vp); 254 struct msdosfsmount *pmp = dep->de_pmp; 255 mode_t file_mode; 256 accmode_t accmode = ap->a_accmode; 257 258 file_mode = S_IRWXU|S_IRWXG|S_IRWXO; 259 file_mode &= (vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); 260 261 /* 262 * Disallow writing to directories and regular files if the 263 * filesystem is read-only. 264 */ 265 if (accmode & VWRITE) { 266 switch (vp->v_type) { 267 case VREG: 268 case VDIR: 269 if (vp->v_mount->mnt_flag & MNT_RDONLY) 270 return (EROFS); 271 break; 272 default: 273 break; 274 } 275 } 276 277 return (vaccess(vp->v_type, file_mode, pmp->pm_uid, pmp->pm_gid, 278 ap->a_accmode, ap->a_cred, NULL)); 279 } 280 281 static int 282 msdosfs_getattr(ap) 283 struct vop_getattr_args /* { 284 struct vnode *a_vp; 285 struct vattr *a_vap; 286 struct ucred *a_cred; 287 } */ *ap; 288 { 289 struct denode *dep = VTODE(ap->a_vp); 290 struct msdosfsmount *pmp = dep->de_pmp; 291 struct vattr *vap = ap->a_vap; 292 mode_t mode; 293 struct timespec ts; 294 u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 295 uint64_t fileid; 296 297 getnanotime(&ts); 298 DETIMES(dep, &ts, &ts, &ts); 299 vap->va_fsid = dev2udev(pmp->pm_dev); 300 /* 301 * The following computation of the fileid must be the same as that 302 * used in msdosfs_readdir() to compute d_fileno. If not, pwd 303 * doesn't work. 304 */ 305 if (dep->de_Attributes & ATTR_DIRECTORY) { 306 fileid = (uint64_t)cntobn(pmp, dep->de_StartCluster) * 307 dirsperblk; 308 if (dep->de_StartCluster == MSDOSFSROOT) 309 fileid = 1; 310 } else { 311 fileid = (uint64_t)cntobn(pmp, dep->de_dirclust) * 312 dirsperblk; 313 if (dep->de_dirclust == MSDOSFSROOT) 314 fileid = (uint64_t)roottobn(pmp, 0) * dirsperblk; 315 fileid += (uoff_t)dep->de_diroffset / sizeof(struct direntry); 316 } 317 318 if (pmp->pm_flags & MSDOSFS_LARGEFS) 319 vap->va_fileid = msdosfs_fileno_map(pmp->pm_mountp, fileid); 320 else 321 vap->va_fileid = (long)fileid; 322 323 mode = S_IRWXU|S_IRWXG|S_IRWXO; 324 vap->va_mode = mode & 325 (ap->a_vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); 326 vap->va_uid = pmp->pm_uid; 327 vap->va_gid = pmp->pm_gid; 328 vap->va_nlink = 1; 329 vap->va_rdev = NODEV; 330 vap->va_size = dep->de_FileSize; 331 fattime2timespec(dep->de_MDate, dep->de_MTime, 0, 0, &vap->va_mtime); 332 vap->va_ctime = vap->va_mtime; 333 if (pmp->pm_flags & MSDOSFSMNT_LONGNAME) { 334 fattime2timespec(dep->de_ADate, 0, 0, 0, &vap->va_atime); 335 fattime2timespec(dep->de_CDate, dep->de_CTime, dep->de_CHun, 336 0, &vap->va_birthtime); 337 } else { 338 vap->va_atime = vap->va_mtime; 339 vap->va_birthtime.tv_sec = -1; 340 vap->va_birthtime.tv_nsec = 0; 341 } 342 vap->va_flags = 0; 343 if (dep->de_Attributes & ATTR_ARCHIVE) 344 vap->va_flags |= UF_ARCHIVE; 345 if (dep->de_Attributes & ATTR_HIDDEN) 346 vap->va_flags |= UF_HIDDEN; 347 if (dep->de_Attributes & ATTR_READONLY) 348 vap->va_flags |= UF_READONLY; 349 if (dep->de_Attributes & ATTR_SYSTEM) 350 vap->va_flags |= UF_SYSTEM; 351 vap->va_gen = 0; 352 vap->va_blocksize = pmp->pm_bpcluster; 353 vap->va_bytes = 354 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask; 355 vap->va_type = ap->a_vp->v_type; 356 vap->va_filerev = dep->de_modrev; 357 return (0); 358 } 359 360 static int 361 msdosfs_setattr(ap) 362 struct vop_setattr_args /* { 363 struct vnode *a_vp; 364 struct vattr *a_vap; 365 struct ucred *a_cred; 366 } */ *ap; 367 { 368 struct vnode *vp = ap->a_vp; 369 struct denode *dep = VTODE(ap->a_vp); 370 struct msdosfsmount *pmp = dep->de_pmp; 371 struct vattr *vap = ap->a_vap; 372 struct ucred *cred = ap->a_cred; 373 struct thread *td = curthread; 374 int error = 0; 375 376 #ifdef MSDOSFS_DEBUG 377 printf("msdosfs_setattr(): vp %p, vap %p, cred %p\n", 378 ap->a_vp, vap, cred); 379 #endif 380 381 /* 382 * Check for unsettable attributes. 383 */ 384 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 385 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 386 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 387 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 388 #ifdef MSDOSFS_DEBUG 389 printf("msdosfs_setattr(): returning EINVAL\n"); 390 printf(" va_type %d, va_nlink %x, va_fsid %lx, va_fileid %lx\n", 391 vap->va_type, vap->va_nlink, vap->va_fsid, vap->va_fileid); 392 printf(" va_blocksize %lx, va_rdev %x, va_bytes %qx, va_gen %lx\n", 393 vap->va_blocksize, vap->va_rdev, vap->va_bytes, vap->va_gen); 394 printf(" va_uid %x, va_gid %x\n", 395 vap->va_uid, vap->va_gid); 396 #endif 397 return (EINVAL); 398 } 399 400 /* 401 * We don't allow setting attributes on the root directory. 402 * The special case for the root directory is because before 403 * FAT32, the root directory didn't have an entry for itself 404 * (and was otherwise special). With FAT32, the root 405 * directory is not so special, but still doesn't have an 406 * entry for itself. 407 */ 408 if (vp->v_vflag & VV_ROOT) 409 return (EINVAL); 410 411 if (vap->va_flags != VNOVAL) { 412 if (vp->v_mount->mnt_flag & MNT_RDONLY) 413 return (EROFS); 414 if (cred->cr_uid != pmp->pm_uid) { 415 error = priv_check_cred(cred, PRIV_VFS_ADMIN, 0); 416 if (error) 417 return (error); 418 } 419 /* 420 * We are very inconsistent about handling unsupported 421 * attributes. We ignored the access time and the 422 * read and execute bits. We were strict for the other 423 * attributes. 424 */ 425 if (vap->va_flags & ~(UF_ARCHIVE | UF_HIDDEN | UF_READONLY | 426 UF_SYSTEM)) 427 return EOPNOTSUPP; 428 if (vap->va_flags & UF_ARCHIVE) 429 dep->de_Attributes |= ATTR_ARCHIVE; 430 else 431 dep->de_Attributes &= ~ATTR_ARCHIVE; 432 if (vap->va_flags & UF_HIDDEN) 433 dep->de_Attributes |= ATTR_HIDDEN; 434 else 435 dep->de_Attributes &= ~ATTR_HIDDEN; 436 /* We don't allow changing the readonly bit on directories. */ 437 if (vp->v_type != VDIR) { 438 if (vap->va_flags & UF_READONLY) 439 dep->de_Attributes |= ATTR_READONLY; 440 else 441 dep->de_Attributes &= ~ATTR_READONLY; 442 } 443 if (vap->va_flags & UF_SYSTEM) 444 dep->de_Attributes |= ATTR_SYSTEM; 445 else 446 dep->de_Attributes &= ~ATTR_SYSTEM; 447 dep->de_flag |= DE_MODIFIED; 448 } 449 450 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 451 uid_t uid; 452 gid_t gid; 453 454 if (vp->v_mount->mnt_flag & MNT_RDONLY) 455 return (EROFS); 456 uid = vap->va_uid; 457 if (uid == (uid_t)VNOVAL) 458 uid = pmp->pm_uid; 459 gid = vap->va_gid; 460 if (gid == (gid_t)VNOVAL) 461 gid = pmp->pm_gid; 462 if (cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid || 463 (gid != pmp->pm_gid && !groupmember(gid, cred))) { 464 error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0); 465 if (error) 466 return (error); 467 } 468 if (uid != pmp->pm_uid || gid != pmp->pm_gid) 469 return EINVAL; 470 } 471 472 if (vap->va_size != VNOVAL) { 473 switch (vp->v_type) { 474 case VDIR: 475 return (EISDIR); 476 case VREG: 477 /* 478 * Truncation is only supported for regular files, 479 * Disallow it if the filesystem is read-only. 480 */ 481 if (vp->v_mount->mnt_flag & MNT_RDONLY) 482 return (EROFS); 483 break; 484 default: 485 /* 486 * According to POSIX, the result is unspecified 487 * for file types other than regular files, 488 * directories and shared memory objects. We 489 * don't support any file types except regular 490 * files and directories in this file system, so 491 * this (default) case is unreachable and can do 492 * anything. Keep falling through to detrunc() 493 * for now. 494 */ 495 break; 496 } 497 error = detrunc(dep, vap->va_size, 0, cred); 498 if (error) 499 return error; 500 } 501 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 502 if (vp->v_mount->mnt_flag & MNT_RDONLY) 503 return (EROFS); 504 if (vap->va_vaflags & VA_UTIMES_NULL) { 505 error = VOP_ACCESS(vp, VADMIN, cred, td); 506 if (error) 507 error = VOP_ACCESS(vp, VWRITE, cred, td); 508 } else 509 error = VOP_ACCESS(vp, VADMIN, cred, td); 510 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 && 511 vap->va_atime.tv_sec != VNOVAL) { 512 dep->de_flag &= ~DE_ACCESS; 513 timespec2fattime(&vap->va_atime, 0, 514 &dep->de_ADate, NULL, NULL); 515 } 516 if (vap->va_mtime.tv_sec != VNOVAL) { 517 dep->de_flag &= ~DE_UPDATE; 518 timespec2fattime(&vap->va_mtime, 0, 519 &dep->de_MDate, &dep->de_MTime, NULL); 520 } 521 /* 522 * We don't set the archive bit when modifying the time of 523 * a directory to emulate the Windows/DOS behavior. 524 */ 525 if (vp->v_type != VDIR) 526 dep->de_Attributes |= ATTR_ARCHIVE; 527 dep->de_flag |= DE_MODIFIED; 528 } 529 /* 530 * DOS files only have the ability to have their writability 531 * attribute set, so we use the owner write bit to set the readonly 532 * attribute. 533 */ 534 if (vap->va_mode != (mode_t)VNOVAL) { 535 if (vp->v_mount->mnt_flag & MNT_RDONLY) 536 return (EROFS); 537 if (cred->cr_uid != pmp->pm_uid) { 538 error = priv_check_cred(cred, PRIV_VFS_ADMIN, 0); 539 if (error) 540 return (error); 541 } 542 if (vp->v_type != VDIR) { 543 /* We ignore the read and execute bits. */ 544 if (vap->va_mode & VWRITE) 545 dep->de_Attributes &= ~ATTR_READONLY; 546 else 547 dep->de_Attributes |= ATTR_READONLY; 548 dep->de_Attributes |= ATTR_ARCHIVE; 549 dep->de_flag |= DE_MODIFIED; 550 } 551 } 552 return (deupdat(dep, 0)); 553 } 554 555 static int 556 msdosfs_read(ap) 557 struct vop_read_args /* { 558 struct vnode *a_vp; 559 struct uio *a_uio; 560 int a_ioflag; 561 struct ucred *a_cred; 562 } */ *ap; 563 { 564 int error = 0; 565 int blsize; 566 int isadir; 567 ssize_t orig_resid; 568 u_int n; 569 u_long diff; 570 u_long on; 571 daddr_t lbn; 572 daddr_t rablock; 573 int rasize; 574 int seqcount; 575 struct buf *bp; 576 struct vnode *vp = ap->a_vp; 577 struct denode *dep = VTODE(vp); 578 struct msdosfsmount *pmp = dep->de_pmp; 579 struct uio *uio = ap->a_uio; 580 581 /* 582 * If they didn't ask for any data, then we are done. 583 */ 584 orig_resid = uio->uio_resid; 585 if (orig_resid == 0) 586 return (0); 587 588 /* 589 * The caller is supposed to ensure that 590 * uio->uio_offset >= 0 and uio->uio_resid >= 0. 591 * We don't need to check for large offsets as in ffs because 592 * dep->de_FileSize <= DOS_FILESIZE_MAX < OFF_MAX, so large 593 * offsets cannot cause overflow even in theory. 594 */ 595 596 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 597 598 isadir = dep->de_Attributes & ATTR_DIRECTORY; 599 do { 600 if (uio->uio_offset >= dep->de_FileSize) 601 break; 602 lbn = de_cluster(pmp, uio->uio_offset); 603 rablock = lbn + 1; 604 blsize = pmp->pm_bpcluster; 605 on = uio->uio_offset & pmp->pm_crbomask; 606 /* 607 * If we are operating on a directory file then be sure to 608 * do i/o with the vnode for the filesystem instead of the 609 * vnode for the directory. 610 */ 611 if (isadir) { 612 /* convert cluster # to block # */ 613 error = pcbmap(dep, lbn, &lbn, 0, &blsize); 614 if (error == E2BIG) { 615 error = EINVAL; 616 break; 617 } else if (error) 618 break; 619 error = bread(pmp->pm_devvp, lbn, blsize, NOCRED, &bp); 620 } else if (de_cn2off(pmp, rablock) >= dep->de_FileSize) { 621 error = bread(vp, lbn, blsize, NOCRED, &bp); 622 } else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) { 623 error = cluster_read(vp, dep->de_FileSize, lbn, blsize, 624 NOCRED, on + uio->uio_resid, seqcount, 0, &bp); 625 } else if (seqcount > 1) { 626 rasize = blsize; 627 error = breadn(vp, lbn, 628 blsize, &rablock, &rasize, 1, NOCRED, &bp); 629 } else { 630 error = bread(vp, lbn, blsize, NOCRED, &bp); 631 } 632 if (error) { 633 brelse(bp); 634 break; 635 } 636 diff = pmp->pm_bpcluster - on; 637 n = diff > uio->uio_resid ? uio->uio_resid : diff; 638 diff = dep->de_FileSize - uio->uio_offset; 639 if (diff < n) 640 n = diff; 641 diff = blsize - bp->b_resid; 642 if (diff < n) 643 n = diff; 644 error = uiomove(bp->b_data + on, (int) n, uio); 645 brelse(bp); 646 } while (error == 0 && uio->uio_resid > 0 && n != 0); 647 if (!isadir && (error == 0 || uio->uio_resid != orig_resid) && 648 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 649 dep->de_flag |= DE_ACCESS; 650 return (error); 651 } 652 653 /* 654 * Write data to a file or directory. 655 */ 656 static int 657 msdosfs_write(ap) 658 struct vop_write_args /* { 659 struct vnode *a_vp; 660 struct uio *a_uio; 661 int a_ioflag; 662 struct ucred *a_cred; 663 } */ *ap; 664 { 665 int n; 666 int croffset; 667 ssize_t resid; 668 u_long osize; 669 int error = 0; 670 u_long count; 671 int seqcount; 672 daddr_t bn, lastcn; 673 struct buf *bp; 674 int ioflag = ap->a_ioflag; 675 struct uio *uio = ap->a_uio; 676 struct vnode *vp = ap->a_vp; 677 struct vnode *thisvp; 678 struct denode *dep = VTODE(vp); 679 struct msdosfsmount *pmp = dep->de_pmp; 680 struct ucred *cred = ap->a_cred; 681 682 #ifdef MSDOSFS_DEBUG 683 printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n", 684 vp, uio, ioflag, cred); 685 printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n", 686 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster); 687 #endif 688 689 switch (vp->v_type) { 690 case VREG: 691 if (ioflag & IO_APPEND) 692 uio->uio_offset = dep->de_FileSize; 693 thisvp = vp; 694 break; 695 case VDIR: 696 return EISDIR; 697 default: 698 panic("msdosfs_write(): bad file type"); 699 } 700 701 /* 702 * This is needed (unlike in ffs_write()) because we extend the 703 * file outside of the loop but we don't want to extend the file 704 * for writes of 0 bytes. 705 */ 706 if (uio->uio_resid == 0) 707 return (0); 708 709 /* 710 * The caller is supposed to ensure that 711 * uio->uio_offset >= 0 and uio->uio_resid >= 0. 712 */ 713 if ((uoff_t)uio->uio_offset + uio->uio_resid > DOS_FILESIZE_MAX) 714 return (EFBIG); 715 716 /* 717 * If they've exceeded their filesize limit, tell them about it. 718 */ 719 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 720 return (EFBIG); 721 722 /* 723 * If the offset we are starting the write at is beyond the end of 724 * the file, then they've done a seek. Unix filesystems allow 725 * files with holes in them, DOS doesn't so we must fill the hole 726 * with zeroed blocks. 727 */ 728 if (uio->uio_offset > dep->de_FileSize) { 729 error = deextend(dep, uio->uio_offset, cred); 730 if (error) 731 return (error); 732 } 733 734 /* 735 * Remember some values in case the write fails. 736 */ 737 resid = uio->uio_resid; 738 osize = dep->de_FileSize; 739 740 /* 741 * If we write beyond the end of the file, extend it to its ultimate 742 * size ahead of the time to hopefully get a contiguous area. 743 */ 744 if (uio->uio_offset + resid > osize) { 745 count = de_clcount(pmp, uio->uio_offset + resid) - 746 de_clcount(pmp, osize); 747 error = extendfile(dep, count, NULL, NULL, 0); 748 if (error && (error != ENOSPC || (ioflag & IO_UNIT))) 749 goto errexit; 750 lastcn = dep->de_fc[FC_LASTFC].fc_frcn; 751 } else 752 lastcn = de_clcount(pmp, osize) - 1; 753 754 seqcount = ioflag >> IO_SEQSHIFT; 755 do { 756 if (de_cluster(pmp, uio->uio_offset) > lastcn) { 757 error = ENOSPC; 758 break; 759 } 760 761 croffset = uio->uio_offset & pmp->pm_crbomask; 762 n = min(uio->uio_resid, pmp->pm_bpcluster - croffset); 763 if (uio->uio_offset + n > dep->de_FileSize) { 764 dep->de_FileSize = uio->uio_offset + n; 765 /* The object size needs to be set before buffer is allocated */ 766 vnode_pager_setsize(vp, dep->de_FileSize); 767 } 768 769 bn = de_cluster(pmp, uio->uio_offset); 770 if ((uio->uio_offset & pmp->pm_crbomask) == 0 771 && (de_cluster(pmp, uio->uio_offset + uio->uio_resid) 772 > de_cluster(pmp, uio->uio_offset) 773 || uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) { 774 /* 775 * If either the whole cluster gets written, 776 * or we write the cluster from its start beyond EOF, 777 * then no need to read data from disk. 778 */ 779 bp = getblk(thisvp, bn, pmp->pm_bpcluster, 0, 0, 0); 780 vfs_bio_clrbuf(bp); 781 /* 782 * Do the bmap now, since pcbmap needs buffers 783 * for the fat table. (see msdosfs_strategy) 784 */ 785 if (bp->b_blkno == bp->b_lblkno) { 786 error = pcbmap(dep, bp->b_lblkno, &bn, 0, 0); 787 if (error) 788 bp->b_blkno = -1; 789 else 790 bp->b_blkno = bn; 791 } 792 if (bp->b_blkno == -1) { 793 brelse(bp); 794 if (!error) 795 error = EIO; /* XXX */ 796 break; 797 } 798 } else { 799 /* 800 * The block we need to write into exists, so read it in. 801 */ 802 error = bread(thisvp, bn, pmp->pm_bpcluster, cred, &bp); 803 if (error) { 804 brelse(bp); 805 break; 806 } 807 } 808 809 /* 810 * Should these vnode_pager_* functions be done on dir 811 * files? 812 */ 813 814 /* 815 * Copy the data from user space into the buf header. 816 */ 817 error = uiomove(bp->b_data + croffset, n, uio); 818 if (error) { 819 brelse(bp); 820 break; 821 } 822 823 /* Prepare for clustered writes in some else clauses. */ 824 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) 825 bp->b_flags |= B_CLUSTEROK; 826 827 /* 828 * If IO_SYNC, then each buffer is written synchronously. 829 * Otherwise, if we have a severe page deficiency then 830 * write the buffer asynchronously. Otherwise, if on a 831 * cluster boundary then write the buffer asynchronously, 832 * combining it with contiguous clusters if permitted and 833 * possible, since we don't expect more writes into this 834 * buffer soon. Otherwise, do a delayed write because we 835 * expect more writes into this buffer soon. 836 */ 837 if (ioflag & IO_SYNC) 838 (void)bwrite(bp); 839 else if (vm_page_count_severe() || buf_dirty_count_severe()) 840 bawrite(bp); 841 else if (n + croffset == pmp->pm_bpcluster) { 842 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) 843 cluster_write(vp, bp, dep->de_FileSize, 844 seqcount, 0); 845 else 846 bawrite(bp); 847 } else 848 bdwrite(bp); 849 dep->de_flag |= DE_UPDATE; 850 } while (error == 0 && uio->uio_resid > 0); 851 852 /* 853 * If the write failed and they want us to, truncate the file back 854 * to the size it was before the write was attempted. 855 */ 856 errexit: 857 if (error) { 858 if (ioflag & IO_UNIT) { 859 detrunc(dep, osize, ioflag & IO_SYNC, NOCRED); 860 uio->uio_offset -= resid - uio->uio_resid; 861 uio->uio_resid = resid; 862 } else { 863 detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC, NOCRED); 864 if (uio->uio_resid != resid) 865 error = 0; 866 } 867 } else if (ioflag & IO_SYNC) 868 error = deupdat(dep, 1); 869 return (error); 870 } 871 872 /* 873 * Flush the blocks of a file to disk. 874 */ 875 static int 876 msdosfs_fsync(ap) 877 struct vop_fsync_args /* { 878 struct vnode *a_vp; 879 struct ucred *a_cred; 880 int a_waitfor; 881 struct thread *a_td; 882 } */ *ap; 883 { 884 struct vnode *devvp; 885 int allerror, error; 886 887 vop_stdfsync(ap); 888 889 /* 890 * If the syncing request comes from fsync(2), sync the entire 891 * FAT and any other metadata that happens to be on devvp. We 892 * need this mainly for the FAT. We write the FAT sloppily, and 893 * syncing it all now is the best we can easily do to get all 894 * directory entries associated with the file (not just the file) 895 * fully synced. The other metadata includes critical metadata 896 * for all directory entries, but only in the MNT_ASYNC case. We 897 * will soon sync all metadata in the file's directory entry. 898 * Non-critical metadata for associated directory entries only 899 * gets synced accidentally, as in most file systems. 900 */ 901 if (ap->a_waitfor == MNT_WAIT) { 902 devvp = VTODE(ap->a_vp)->de_pmp->pm_devvp; 903 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 904 allerror = VOP_FSYNC(devvp, MNT_WAIT, ap->a_td); 905 VOP_UNLOCK(devvp, 0); 906 } else 907 allerror = 0; 908 909 error = deupdat(VTODE(ap->a_vp), ap->a_waitfor == MNT_WAIT); 910 if (allerror == 0) 911 allerror = error; 912 return (allerror); 913 } 914 915 static int 916 msdosfs_remove(ap) 917 struct vop_remove_args /* { 918 struct vnode *a_dvp; 919 struct vnode *a_vp; 920 struct componentname *a_cnp; 921 } */ *ap; 922 { 923 struct denode *dep = VTODE(ap->a_vp); 924 struct denode *ddep = VTODE(ap->a_dvp); 925 int error; 926 927 if (ap->a_vp->v_type == VDIR) 928 error = EPERM; 929 else 930 error = removede(ddep, dep); 931 #ifdef MSDOSFS_DEBUG 932 printf("msdosfs_remove(), dep %p, v_usecount %d\n", dep, ap->a_vp->v_usecount); 933 #endif 934 return (error); 935 } 936 937 /* 938 * DOS filesystems don't know what links are. 939 */ 940 static int 941 msdosfs_link(ap) 942 struct vop_link_args /* { 943 struct vnode *a_tdvp; 944 struct vnode *a_vp; 945 struct componentname *a_cnp; 946 } */ *ap; 947 { 948 return (EOPNOTSUPP); 949 } 950 951 /* 952 * Renames on files require moving the denode to a new hash queue since the 953 * denode's location is used to compute which hash queue to put the file 954 * in. Unless it is a rename in place. For example "mv a b". 955 * 956 * What follows is the basic algorithm: 957 * 958 * if (file move) { 959 * if (dest file exists) { 960 * remove dest file 961 * } 962 * if (dest and src in same directory) { 963 * rewrite name in existing directory slot 964 * } else { 965 * write new entry in dest directory 966 * update offset and dirclust in denode 967 * move denode to new hash chain 968 * clear old directory entry 969 * } 970 * } else { 971 * directory move 972 * if (dest directory exists) { 973 * if (dest is not empty) { 974 * return ENOTEMPTY 975 * } 976 * remove dest directory 977 * } 978 * if (dest and src in same directory) { 979 * rewrite name in existing entry 980 * } else { 981 * be sure dest is not a child of src directory 982 * write entry in dest directory 983 * update "." and ".." in moved directory 984 * clear old directory entry for moved directory 985 * } 986 * } 987 * 988 * On entry: 989 * source's parent directory is unlocked 990 * source file or directory is unlocked 991 * destination's parent directory is locked 992 * destination file or directory is locked if it exists 993 * 994 * On exit: 995 * all denodes should be released 996 */ 997 static int 998 msdosfs_rename(ap) 999 struct vop_rename_args /* { 1000 struct vnode *a_fdvp; 1001 struct vnode *a_fvp; 1002 struct componentname *a_fcnp; 1003 struct vnode *a_tdvp; 1004 struct vnode *a_tvp; 1005 struct componentname *a_tcnp; 1006 } */ *ap; 1007 { 1008 struct vnode *tdvp = ap->a_tdvp; 1009 struct vnode *fvp = ap->a_fvp; 1010 struct vnode *fdvp = ap->a_fdvp; 1011 struct vnode *tvp = ap->a_tvp; 1012 struct componentname *tcnp = ap->a_tcnp; 1013 struct componentname *fcnp = ap->a_fcnp; 1014 struct denode *ip, *xp, *dp, *zp; 1015 u_char toname[12], oldname[11]; 1016 u_long from_diroffset, to_diroffset; 1017 u_char to_count; 1018 int doingdirectory = 0, newparent = 0; 1019 int error; 1020 u_long cn, pcl; 1021 daddr_t bn; 1022 struct denode *fddep; /* from file's parent directory */ 1023 struct msdosfsmount *pmp; 1024 struct direntry *dotdotp; 1025 struct buf *bp; 1026 1027 fddep = VTODE(ap->a_fdvp); 1028 pmp = fddep->de_pmp; 1029 1030 pmp = VFSTOMSDOSFS(fdvp->v_mount); 1031 1032 #ifdef DIAGNOSTIC 1033 if ((tcnp->cn_flags & HASBUF) == 0 || 1034 (fcnp->cn_flags & HASBUF) == 0) 1035 panic("msdosfs_rename: no name"); 1036 #endif 1037 /* 1038 * Check for cross-device rename. 1039 */ 1040 if (fvp->v_mount != tdvp->v_mount || 1041 (tvp && fvp->v_mount != tvp->v_mount)) { 1042 error = EXDEV; 1043 abortit: 1044 if (tdvp == tvp) 1045 vrele(tdvp); 1046 else 1047 vput(tdvp); 1048 if (tvp) 1049 vput(tvp); 1050 vrele(fdvp); 1051 vrele(fvp); 1052 return (error); 1053 } 1054 1055 /* 1056 * If source and dest are the same, do nothing. 1057 */ 1058 if (tvp == fvp) { 1059 error = 0; 1060 goto abortit; 1061 } 1062 1063 error = vn_lock(fvp, LK_EXCLUSIVE); 1064 if (error) 1065 goto abortit; 1066 dp = VTODE(fdvp); 1067 ip = VTODE(fvp); 1068 1069 /* 1070 * Be sure we are not renaming ".", "..", or an alias of ".". This 1071 * leads to a crippled directory tree. It's pretty tough to do a 1072 * "ls" or "pwd" with the "." directory entry missing, and "cd .." 1073 * doesn't work if the ".." entry is missing. 1074 */ 1075 if (ip->de_Attributes & ATTR_DIRECTORY) { 1076 /* 1077 * Avoid ".", "..", and aliases of "." for obvious reasons. 1078 */ 1079 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 1080 dp == ip || 1081 (fcnp->cn_flags & ISDOTDOT) || 1082 (tcnp->cn_flags & ISDOTDOT) || 1083 (ip->de_flag & DE_RENAME)) { 1084 VOP_UNLOCK(fvp, 0); 1085 error = EINVAL; 1086 goto abortit; 1087 } 1088 ip->de_flag |= DE_RENAME; 1089 doingdirectory++; 1090 } 1091 1092 /* 1093 * When the target exists, both the directory 1094 * and target vnodes are returned locked. 1095 */ 1096 dp = VTODE(tdvp); 1097 xp = tvp ? VTODE(tvp) : NULL; 1098 /* 1099 * Remember direntry place to use for destination 1100 */ 1101 to_diroffset = dp->de_fndoffset; 1102 to_count = dp->de_fndcnt; 1103 1104 /* 1105 * If ".." must be changed (ie the directory gets a new 1106 * parent) then the source directory must not be in the 1107 * directory hierarchy above the target, as this would 1108 * orphan everything below the source directory. Also 1109 * the user must have write permission in the source so 1110 * as to be able to change "..". We must repeat the call 1111 * to namei, as the parent directory is unlocked by the 1112 * call to doscheckpath(). 1113 */ 1114 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread); 1115 VOP_UNLOCK(fvp, 0); 1116 if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster) 1117 newparent = 1; 1118 if (doingdirectory && newparent) { 1119 if (error) /* write access check above */ 1120 goto bad; 1121 if (xp != NULL) 1122 vput(tvp); 1123 /* 1124 * doscheckpath() vput()'s dp, 1125 * so we have to do a relookup afterwards 1126 */ 1127 error = doscheckpath(ip, dp); 1128 if (error) 1129 goto out; 1130 if ((tcnp->cn_flags & SAVESTART) == 0) 1131 panic("msdosfs_rename: lost to startdir"); 1132 error = relookup(tdvp, &tvp, tcnp); 1133 if (error) 1134 goto out; 1135 dp = VTODE(tdvp); 1136 xp = tvp ? VTODE(tvp) : NULL; 1137 } 1138 1139 if (xp != NULL) { 1140 /* 1141 * Target must be empty if a directory and have no links 1142 * to it. Also, ensure source and target are compatible 1143 * (both directories, or both not directories). 1144 */ 1145 if (xp->de_Attributes & ATTR_DIRECTORY) { 1146 if (!dosdirempty(xp)) { 1147 error = ENOTEMPTY; 1148 goto bad; 1149 } 1150 if (!doingdirectory) { 1151 error = ENOTDIR; 1152 goto bad; 1153 } 1154 cache_purge(tdvp); 1155 } else if (doingdirectory) { 1156 error = EISDIR; 1157 goto bad; 1158 } 1159 error = removede(dp, xp); 1160 if (error) 1161 goto bad; 1162 vput(tvp); 1163 xp = NULL; 1164 } 1165 1166 /* 1167 * Convert the filename in tcnp into a dos filename. We copy this 1168 * into the denode and directory entry for the destination 1169 * file/directory. 1170 */ 1171 error = uniqdosname(VTODE(tdvp), tcnp, toname); 1172 if (error) 1173 goto abortit; 1174 1175 /* 1176 * Since from wasn't locked at various places above, 1177 * have to do a relookup here. 1178 */ 1179 fcnp->cn_flags &= ~MODMASK; 1180 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 1181 if ((fcnp->cn_flags & SAVESTART) == 0) 1182 panic("msdosfs_rename: lost from startdir"); 1183 if (!newparent) 1184 VOP_UNLOCK(tdvp, 0); 1185 if (relookup(fdvp, &fvp, fcnp) == 0) 1186 vrele(fdvp); 1187 if (fvp == NULL) { 1188 /* 1189 * From name has disappeared. 1190 */ 1191 if (doingdirectory) 1192 panic("rename: lost dir entry"); 1193 if (newparent) 1194 VOP_UNLOCK(tdvp, 0); 1195 vrele(tdvp); 1196 vrele(ap->a_fvp); 1197 return 0; 1198 } 1199 xp = VTODE(fvp); 1200 zp = VTODE(fdvp); 1201 from_diroffset = zp->de_fndoffset; 1202 1203 /* 1204 * Ensure that the directory entry still exists and has not 1205 * changed till now. If the source is a file the entry may 1206 * have been unlinked or renamed. In either case there is 1207 * no further work to be done. If the source is a directory 1208 * then it cannot have been rmdir'ed or renamed; this is 1209 * prohibited by the DE_RENAME flag. 1210 */ 1211 if (xp != ip) { 1212 if (doingdirectory) 1213 panic("rename: lost dir entry"); 1214 VOP_UNLOCK(fvp, 0); 1215 if (newparent) 1216 VOP_UNLOCK(fdvp, 0); 1217 vrele(ap->a_fvp); 1218 xp = NULL; 1219 } else { 1220 vrele(fvp); 1221 xp = NULL; 1222 1223 /* 1224 * First write a new entry in the destination 1225 * directory and mark the entry in the source directory 1226 * as deleted. Then move the denode to the correct hash 1227 * chain for its new location in the filesystem. And, if 1228 * we moved a directory, then update its .. entry to point 1229 * to the new parent directory. 1230 */ 1231 bcopy(ip->de_Name, oldname, 11); 1232 bcopy(toname, ip->de_Name, 11); /* update denode */ 1233 dp->de_fndoffset = to_diroffset; 1234 dp->de_fndcnt = to_count; 1235 error = createde(ip, dp, (struct denode **)0, tcnp); 1236 if (error) { 1237 bcopy(oldname, ip->de_Name, 11); 1238 if (newparent) 1239 VOP_UNLOCK(fdvp, 0); 1240 VOP_UNLOCK(fvp, 0); 1241 goto bad; 1242 } 1243 ip->de_refcnt++; 1244 zp->de_fndoffset = from_diroffset; 1245 error = removede(zp, ip); 1246 if (error) { 1247 /* XXX should downgrade to ro here, fs is corrupt */ 1248 if (newparent) 1249 VOP_UNLOCK(fdvp, 0); 1250 VOP_UNLOCK(fvp, 0); 1251 goto bad; 1252 } 1253 if (!doingdirectory) { 1254 error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0, 1255 &ip->de_dirclust, 0); 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 (ip->de_dirclust == MSDOSFSROOT) 1264 ip->de_diroffset = to_diroffset; 1265 else 1266 ip->de_diroffset = to_diroffset & pmp->pm_crbomask; 1267 } 1268 reinsert(ip); 1269 if (newparent) 1270 VOP_UNLOCK(fdvp, 0); 1271 } 1272 1273 /* 1274 * If we moved a directory to a new parent directory, then we must 1275 * fixup the ".." entry in the moved directory. 1276 */ 1277 if (doingdirectory && newparent) { 1278 cn = ip->de_StartCluster; 1279 if (cn == MSDOSFSROOT) { 1280 /* this should never happen */ 1281 panic("msdosfs_rename(): updating .. in root directory?"); 1282 } else 1283 bn = cntobn(pmp, cn); 1284 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, 1285 NOCRED, &bp); 1286 if (error) { 1287 /* XXX should downgrade to ro here, fs is corrupt */ 1288 brelse(bp); 1289 VOP_UNLOCK(fvp, 0); 1290 goto bad; 1291 } 1292 dotdotp = (struct direntry *)bp->b_data + 1; 1293 pcl = dp->de_StartCluster; 1294 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1295 pcl = MSDOSFSROOT; 1296 putushort(dotdotp->deStartCluster, pcl); 1297 if (FAT32(pmp)) 1298 putushort(dotdotp->deHighClust, pcl >> 16); 1299 if (DOINGASYNC(fvp)) 1300 bdwrite(bp); 1301 else if ((error = bwrite(bp)) != 0) { 1302 /* XXX should downgrade to ro here, fs is corrupt */ 1303 VOP_UNLOCK(fvp, 0); 1304 goto bad; 1305 } 1306 } 1307 1308 /* 1309 * The msdosfs lookup is case insensitive. Several aliases may 1310 * be inserted for a single directory entry. As a consequnce, 1311 * name cache purge done by lookup for fvp when DELETE op for 1312 * namei is specified, might be not enough to expunge all 1313 * namecache entries that were installed for this direntry. 1314 */ 1315 cache_purge(fvp); 1316 VOP_UNLOCK(fvp, 0); 1317 bad: 1318 if (xp) 1319 vput(tvp); 1320 vput(tdvp); 1321 out: 1322 ip->de_flag &= ~DE_RENAME; 1323 vrele(fdvp); 1324 vrele(fvp); 1325 return (error); 1326 1327 } 1328 1329 static struct { 1330 struct direntry dot; 1331 struct direntry dotdot; 1332 } dosdirtemplate = { 1333 { ". ", /* the . entry */ 1334 ATTR_DIRECTORY, /* file attribute */ 1335 0, /* reserved */ 1336 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1337 { 0, 0 }, /* access date */ 1338 { 0, 0 }, /* high bits of start cluster */ 1339 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1340 { 0, 0 }, /* startcluster */ 1341 { 0, 0, 0, 0 } /* filesize */ 1342 }, 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 }; 1354 1355 static int 1356 msdosfs_mkdir(ap) 1357 struct vop_mkdir_args /* { 1358 struct vnode *a_dvp; 1359 struct vnode **a_vpp; 1360 struvt componentname *a_cnp; 1361 struct vattr *a_vap; 1362 } */ *ap; 1363 { 1364 struct componentname *cnp = ap->a_cnp; 1365 struct denode *dep; 1366 struct denode *pdep = VTODE(ap->a_dvp); 1367 struct direntry *denp; 1368 struct msdosfsmount *pmp = pdep->de_pmp; 1369 struct buf *bp; 1370 u_long newcluster, pcl; 1371 int bn; 1372 int error; 1373 struct denode ndirent; 1374 struct timespec ts; 1375 1376 /* 1377 * If this is the root directory and there is no space left we 1378 * can't do anything. This is because the root directory can not 1379 * change size. 1380 */ 1381 if (pdep->de_StartCluster == MSDOSFSROOT 1382 && pdep->de_fndoffset >= pdep->de_FileSize) { 1383 error = ENOSPC; 1384 goto bad2; 1385 } 1386 1387 /* 1388 * Allocate a cluster to hold the about to be created directory. 1389 */ 1390 error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL); 1391 if (error) 1392 goto bad2; 1393 1394 bzero(&ndirent, sizeof(ndirent)); 1395 ndirent.de_pmp = pmp; 1396 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 1397 getnanotime(&ts); 1398 DETIMES(&ndirent, &ts, &ts, &ts); 1399 1400 /* 1401 * Now fill the cluster with the "." and ".." entries. And write 1402 * the cluster to disk. This way it is there for the parent 1403 * directory to be pointing at if there were a crash. 1404 */ 1405 bn = cntobn(pmp, newcluster); 1406 /* always succeeds */ 1407 bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0, 0); 1408 bzero(bp->b_data, pmp->pm_bpcluster); 1409 bcopy(&dosdirtemplate, bp->b_data, sizeof dosdirtemplate); 1410 denp = (struct direntry *)bp->b_data; 1411 putushort(denp[0].deStartCluster, newcluster); 1412 putushort(denp[0].deCDate, ndirent.de_CDate); 1413 putushort(denp[0].deCTime, ndirent.de_CTime); 1414 denp[0].deCHundredth = ndirent.de_CHun; 1415 putushort(denp[0].deADate, ndirent.de_ADate); 1416 putushort(denp[0].deMDate, ndirent.de_MDate); 1417 putushort(denp[0].deMTime, ndirent.de_MTime); 1418 pcl = pdep->de_StartCluster; 1419 /* 1420 * Although the root directory has a non-magic starting cluster 1421 * number for FAT32, chkdsk and fsck_msdosfs still require 1422 * references to it in dotdot entries to be magic. 1423 */ 1424 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1425 pcl = MSDOSFSROOT; 1426 putushort(denp[1].deStartCluster, pcl); 1427 putushort(denp[1].deCDate, ndirent.de_CDate); 1428 putushort(denp[1].deCTime, ndirent.de_CTime); 1429 denp[1].deCHundredth = ndirent.de_CHun; 1430 putushort(denp[1].deADate, ndirent.de_ADate); 1431 putushort(denp[1].deMDate, ndirent.de_MDate); 1432 putushort(denp[1].deMTime, ndirent.de_MTime); 1433 if (FAT32(pmp)) { 1434 putushort(denp[0].deHighClust, newcluster >> 16); 1435 putushort(denp[1].deHighClust, pcl >> 16); 1436 } 1437 1438 if (DOINGASYNC(ap->a_dvp)) 1439 bdwrite(bp); 1440 else if ((error = bwrite(bp)) != 0) 1441 goto bad; 1442 1443 /* 1444 * Now build up a directory entry pointing to the newly allocated 1445 * cluster. This will be written to an empty slot in the parent 1446 * directory. 1447 */ 1448 #ifdef DIAGNOSTIC 1449 if ((cnp->cn_flags & HASBUF) == 0) 1450 panic("msdosfs_mkdir: no name"); 1451 #endif 1452 error = uniqdosname(pdep, cnp, ndirent.de_Name); 1453 if (error) 1454 goto bad; 1455 1456 ndirent.de_Attributes = ATTR_DIRECTORY; 1457 ndirent.de_LowerCase = 0; 1458 ndirent.de_StartCluster = newcluster; 1459 ndirent.de_FileSize = 0; 1460 error = createde(&ndirent, pdep, &dep, cnp); 1461 if (error) 1462 goto bad; 1463 *ap->a_vpp = DETOV(dep); 1464 return (0); 1465 1466 bad: 1467 clusterfree(pmp, newcluster, NULL); 1468 bad2: 1469 return (error); 1470 } 1471 1472 static int 1473 msdosfs_rmdir(ap) 1474 struct vop_rmdir_args /* { 1475 struct vnode *a_dvp; 1476 struct vnode *a_vp; 1477 struct componentname *a_cnp; 1478 } */ *ap; 1479 { 1480 struct vnode *vp = ap->a_vp; 1481 struct vnode *dvp = ap->a_dvp; 1482 struct componentname *cnp = ap->a_cnp; 1483 struct denode *ip, *dp; 1484 int error; 1485 1486 ip = VTODE(vp); 1487 dp = VTODE(dvp); 1488 1489 /* 1490 * Verify the directory is empty (and valid). 1491 * (Rmdir ".." won't be valid since 1492 * ".." will contain a reference to 1493 * the current directory and thus be 1494 * non-empty.) 1495 */ 1496 error = 0; 1497 if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) { 1498 error = ENOTEMPTY; 1499 goto out; 1500 } 1501 /* 1502 * Delete the entry from the directory. For dos filesystems this 1503 * gets rid of the directory entry on disk, the in memory copy 1504 * still exists but the de_refcnt is <= 0. This prevents it from 1505 * being found by deget(). When the vput() on dep is done we give 1506 * up access and eventually msdosfs_reclaim() will be called which 1507 * will remove it from the denode cache. 1508 */ 1509 error = removede(dp, ip); 1510 if (error) 1511 goto out; 1512 /* 1513 * This is where we decrement the link count in the parent 1514 * directory. Since dos filesystems don't do this we just purge 1515 * the name cache. 1516 */ 1517 cache_purge(dvp); 1518 /* 1519 * Truncate the directory that is being deleted. 1520 */ 1521 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred); 1522 cache_purge(vp); 1523 1524 out: 1525 return (error); 1526 } 1527 1528 /* 1529 * DOS filesystems don't know what symlinks are. 1530 */ 1531 static int 1532 msdosfs_symlink(ap) 1533 struct vop_symlink_args /* { 1534 struct vnode *a_dvp; 1535 struct vnode **a_vpp; 1536 struct componentname *a_cnp; 1537 struct vattr *a_vap; 1538 char *a_target; 1539 } */ *ap; 1540 { 1541 return (EOPNOTSUPP); 1542 } 1543 1544 static int 1545 msdosfs_readdir(ap) 1546 struct vop_readdir_args /* { 1547 struct vnode *a_vp; 1548 struct uio *a_uio; 1549 struct ucred *a_cred; 1550 int *a_eofflag; 1551 int *a_ncookies; 1552 u_long **a_cookies; 1553 } */ *ap; 1554 { 1555 struct mbnambuf nb; 1556 int error = 0; 1557 int diff; 1558 long n; 1559 int blsize; 1560 long on; 1561 u_long cn; 1562 uint64_t fileno; 1563 u_long dirsperblk; 1564 long bias = 0; 1565 daddr_t bn, lbn; 1566 struct buf *bp; 1567 struct denode *dep = VTODE(ap->a_vp); 1568 struct msdosfsmount *pmp = dep->de_pmp; 1569 struct direntry *dentp; 1570 struct dirent dirbuf; 1571 struct uio *uio = ap->a_uio; 1572 u_long *cookies = NULL; 1573 int ncookies = 0; 1574 off_t offset, off; 1575 int chksum = -1; 1576 1577 #ifdef MSDOSFS_DEBUG 1578 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n", 1579 ap->a_vp, uio, ap->a_cred, ap->a_eofflag); 1580 #endif 1581 1582 /* 1583 * msdosfs_readdir() won't operate properly on regular files since 1584 * it does i/o only with the filesystem vnode, and hence can 1585 * retrieve the wrong block from the buffer cache for a plain file. 1586 * So, fail attempts to readdir() on a plain file. 1587 */ 1588 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) 1589 return (ENOTDIR); 1590 1591 /* 1592 * To be safe, initialize dirbuf 1593 */ 1594 bzero(dirbuf.d_name, sizeof(dirbuf.d_name)); 1595 1596 /* 1597 * If the user buffer is smaller than the size of one dos directory 1598 * entry or the file offset is not a multiple of the size of a 1599 * directory entry, then we fail the read. 1600 */ 1601 off = offset = uio->uio_offset; 1602 if (uio->uio_resid < sizeof(struct direntry) || 1603 (offset & (sizeof(struct direntry) - 1))) 1604 return (EINVAL); 1605 1606 if (ap->a_ncookies) { 1607 ncookies = uio->uio_resid / 16; 1608 cookies = malloc(ncookies * sizeof(u_long), M_TEMP, 1609 M_WAITOK); 1610 *ap->a_cookies = cookies; 1611 *ap->a_ncookies = ncookies; 1612 } 1613 1614 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 1615 1616 /* 1617 * If they are reading from the root directory then, we simulate 1618 * the . and .. entries since these don't exist in the root 1619 * directory. We also set the offset bias to make up for having to 1620 * simulate these entries. By this I mean that at file offset 64 we 1621 * read the first entry in the root directory that lives on disk. 1622 */ 1623 if (dep->de_StartCluster == MSDOSFSROOT 1624 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) { 1625 #if 0 1626 printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n", 1627 offset); 1628 #endif 1629 bias = 2 * sizeof(struct direntry); 1630 if (offset < bias) { 1631 for (n = (int)offset / sizeof(struct direntry); 1632 n < 2; n++) { 1633 if (FAT32(pmp)) 1634 fileno = (uint64_t)cntobn(pmp, 1635 pmp->pm_rootdirblk) 1636 * dirsperblk; 1637 else 1638 fileno = 1; 1639 if (pmp->pm_flags & MSDOSFS_LARGEFS) { 1640 dirbuf.d_fileno = 1641 msdosfs_fileno_map(pmp->pm_mountp, 1642 fileno); 1643 } else { 1644 1645 dirbuf.d_fileno = (uint32_t)fileno; 1646 } 1647 dirbuf.d_type = DT_DIR; 1648 switch (n) { 1649 case 0: 1650 dirbuf.d_namlen = 1; 1651 strcpy(dirbuf.d_name, "."); 1652 break; 1653 case 1: 1654 dirbuf.d_namlen = 2; 1655 strcpy(dirbuf.d_name, ".."); 1656 break; 1657 } 1658 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1659 if (uio->uio_resid < dirbuf.d_reclen) 1660 goto out; 1661 error = uiomove(&dirbuf, dirbuf.d_reclen, uio); 1662 if (error) 1663 goto out; 1664 offset += sizeof(struct direntry); 1665 off = offset; 1666 if (cookies) { 1667 *cookies++ = offset; 1668 if (--ncookies <= 0) 1669 goto out; 1670 } 1671 } 1672 } 1673 } 1674 1675 mbnambuf_init(&nb); 1676 off = offset; 1677 while (uio->uio_resid > 0) { 1678 lbn = de_cluster(pmp, offset - bias); 1679 on = (offset - bias) & pmp->pm_crbomask; 1680 n = min(pmp->pm_bpcluster - on, uio->uio_resid); 1681 diff = dep->de_FileSize - (offset - bias); 1682 if (diff <= 0) 1683 break; 1684 n = min(n, diff); 1685 error = pcbmap(dep, lbn, &bn, &cn, &blsize); 1686 if (error) 1687 break; 1688 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp); 1689 if (error) { 1690 brelse(bp); 1691 return (error); 1692 } 1693 n = min(n, blsize - bp->b_resid); 1694 if (n == 0) { 1695 brelse(bp); 1696 return (EIO); 1697 } 1698 1699 /* 1700 * Convert from dos directory entries to fs-independent 1701 * directory entries. 1702 */ 1703 for (dentp = (struct direntry *)(bp->b_data + on); 1704 (char *)dentp < bp->b_data + on + n; 1705 dentp++, offset += sizeof(struct direntry)) { 1706 #if 0 1707 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n", 1708 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes); 1709 #endif 1710 /* 1711 * If this is an unused entry, we can stop. 1712 */ 1713 if (dentp->deName[0] == SLOT_EMPTY) { 1714 brelse(bp); 1715 goto out; 1716 } 1717 /* 1718 * Skip deleted entries. 1719 */ 1720 if (dentp->deName[0] == SLOT_DELETED) { 1721 chksum = -1; 1722 mbnambuf_init(&nb); 1723 continue; 1724 } 1725 1726 /* 1727 * Handle Win95 long directory entries 1728 */ 1729 if (dentp->deAttributes == ATTR_WIN95) { 1730 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) 1731 continue; 1732 chksum = win2unixfn(&nb, 1733 (struct winentry *)dentp, chksum, pmp); 1734 continue; 1735 } 1736 1737 /* 1738 * Skip volume labels 1739 */ 1740 if (dentp->deAttributes & ATTR_VOLUME) { 1741 chksum = -1; 1742 mbnambuf_init(&nb); 1743 continue; 1744 } 1745 /* 1746 * This computation of d_fileno must match 1747 * the computation of va_fileid in 1748 * msdosfs_getattr. 1749 */ 1750 if (dentp->deAttributes & ATTR_DIRECTORY) { 1751 fileno = getushort(dentp->deStartCluster); 1752 if (FAT32(pmp)) 1753 fileno |= getushort(dentp->deHighClust) << 16; 1754 /* if this is the root directory */ 1755 if (fileno == MSDOSFSROOT) 1756 if (FAT32(pmp)) 1757 fileno = (uint64_t)cntobn(pmp, 1758 pmp->pm_rootdirblk) 1759 * dirsperblk; 1760 else 1761 fileno = 1; 1762 else 1763 fileno = (uint64_t)cntobn(pmp, fileno) * 1764 dirsperblk; 1765 dirbuf.d_type = DT_DIR; 1766 } else { 1767 fileno = (uoff_t)offset / 1768 sizeof(struct direntry); 1769 dirbuf.d_type = DT_REG; 1770 } 1771 if (pmp->pm_flags & MSDOSFS_LARGEFS) { 1772 dirbuf.d_fileno = 1773 msdosfs_fileno_map(pmp->pm_mountp, fileno); 1774 } else 1775 dirbuf.d_fileno = (uint32_t)fileno; 1776 1777 if (chksum != winChksum(dentp->deName)) { 1778 dirbuf.d_namlen = dos2unixfn(dentp->deName, 1779 (u_char *)dirbuf.d_name, 1780 dentp->deLowerCase | 1781 ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ? 1782 (LCASE_BASE | LCASE_EXT) : 0), 1783 pmp); 1784 mbnambuf_init(&nb); 1785 } else 1786 mbnambuf_flush(&nb, &dirbuf); 1787 chksum = -1; 1788 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1789 if (uio->uio_resid < dirbuf.d_reclen) { 1790 brelse(bp); 1791 goto out; 1792 } 1793 error = uiomove(&dirbuf, dirbuf.d_reclen, uio); 1794 if (error) { 1795 brelse(bp); 1796 goto out; 1797 } 1798 if (cookies) { 1799 *cookies++ = offset + sizeof(struct direntry); 1800 if (--ncookies <= 0) { 1801 brelse(bp); 1802 goto out; 1803 } 1804 } 1805 off = offset + sizeof(struct direntry); 1806 } 1807 brelse(bp); 1808 } 1809 out: 1810 /* Subtract unused cookies */ 1811 if (ap->a_ncookies) 1812 *ap->a_ncookies -= ncookies; 1813 1814 uio->uio_offset = off; 1815 1816 /* 1817 * Set the eofflag (NFS uses it) 1818 */ 1819 if (ap->a_eofflag) { 1820 if (dep->de_FileSize - (offset - bias) <= 0) 1821 *ap->a_eofflag = 1; 1822 else 1823 *ap->a_eofflag = 0; 1824 } 1825 return (error); 1826 } 1827 1828 /*- 1829 * a_vp - pointer to the file's vnode 1830 * a_bn - logical block number within the file (cluster number for us) 1831 * a_bop - where to return the bufobj of the special file containing the fs 1832 * a_bnp - where to return the "physical" block number corresponding to a_bn 1833 * (relative to the special file; units are blocks of size DEV_BSIZE) 1834 * a_runp - where to return the "run past" a_bn. This is the count of logical 1835 * blocks whose physical blocks (together with a_bn's physical block) 1836 * are contiguous. 1837 * a_runb - where to return the "run before" a_bn. 1838 */ 1839 static int 1840 msdosfs_bmap(ap) 1841 struct vop_bmap_args /* { 1842 struct vnode *a_vp; 1843 daddr_t a_bn; 1844 struct bufobj **a_bop; 1845 daddr_t *a_bnp; 1846 int *a_runp; 1847 int *a_runb; 1848 } */ *ap; 1849 { 1850 struct denode *dep; 1851 struct mount *mp; 1852 struct msdosfsmount *pmp; 1853 struct vnode *vp; 1854 daddr_t runbn; 1855 u_long cn; 1856 int bnpercn, error, maxio, maxrun, run; 1857 1858 vp = ap->a_vp; 1859 dep = VTODE(vp); 1860 pmp = dep->de_pmp; 1861 if (ap->a_bop != NULL) 1862 *ap->a_bop = &pmp->pm_devvp->v_bufobj; 1863 if (ap->a_bnp == NULL) 1864 return (0); 1865 if (ap->a_runp != NULL) 1866 *ap->a_runp = 0; 1867 if (ap->a_runb != NULL) 1868 *ap->a_runb = 0; 1869 cn = ap->a_bn; 1870 if (cn != ap->a_bn) 1871 return (EFBIG); 1872 error = pcbmap(dep, cn, ap->a_bnp, NULL, NULL); 1873 if (error != 0 || (ap->a_runp == NULL && ap->a_runb == NULL)) 1874 return (error); 1875 1876 mp = vp->v_mount; 1877 maxio = mp->mnt_iosize_max / mp->mnt_stat.f_iosize; 1878 bnpercn = de_cn2bn(pmp, 1); 1879 if (ap->a_runp != NULL) { 1880 maxrun = ulmin(maxio - 1, pmp->pm_maxcluster - cn); 1881 for (run = 1; run <= maxrun; run++) { 1882 if (pcbmap(dep, cn + run, &runbn, NULL, NULL) != 0 || 1883 runbn != *ap->a_bnp + run * bnpercn) 1884 break; 1885 } 1886 *ap->a_runp = run - 1; 1887 } 1888 if (ap->a_runb != NULL) { 1889 maxrun = ulmin(maxio - 1, cn); 1890 for (run = 1; run < maxrun; run++) { 1891 if (pcbmap(dep, cn - run, &runbn, NULL, NULL) != 0 || 1892 runbn != *ap->a_bnp - run * bnpercn) 1893 break; 1894 } 1895 *ap->a_runb = run - 1; 1896 } 1897 return (0); 1898 } 1899 1900 static int 1901 msdosfs_strategy(ap) 1902 struct vop_strategy_args /* { 1903 struct vnode *a_vp; 1904 struct buf *a_bp; 1905 } */ *ap; 1906 { 1907 struct buf *bp = ap->a_bp; 1908 struct denode *dep = VTODE(ap->a_vp); 1909 struct bufobj *bo; 1910 int error = 0; 1911 daddr_t blkno; 1912 1913 /* 1914 * If we don't already know the filesystem relative block number 1915 * then get it using pcbmap(). If pcbmap() returns the block 1916 * number as -1 then we've got a hole in the file. DOS filesystems 1917 * don't allow files with holes, so we shouldn't ever see this. 1918 */ 1919 if (bp->b_blkno == bp->b_lblkno) { 1920 error = pcbmap(dep, bp->b_lblkno, &blkno, 0, 0); 1921 bp->b_blkno = blkno; 1922 if (error) { 1923 bp->b_error = error; 1924 bp->b_ioflags |= BIO_ERROR; 1925 bufdone(bp); 1926 return (0); 1927 } 1928 if ((long)bp->b_blkno == -1) 1929 vfs_bio_clrbuf(bp); 1930 } 1931 if (bp->b_blkno == -1) { 1932 bufdone(bp); 1933 return (0); 1934 } 1935 /* 1936 * Read/write the block from/to the disk that contains the desired 1937 * file block. 1938 */ 1939 bp->b_iooffset = dbtob(bp->b_blkno); 1940 bo = dep->de_pmp->pm_bo; 1941 BO_STRATEGY(bo, bp); 1942 return (0); 1943 } 1944 1945 static int 1946 msdosfs_print(ap) 1947 struct vop_print_args /* { 1948 struct vnode *vp; 1949 } */ *ap; 1950 { 1951 struct denode *dep = VTODE(ap->a_vp); 1952 1953 printf("\tstartcluster %lu, dircluster %lu, diroffset %lu, ", 1954 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset); 1955 printf("on dev %s\n", devtoname(dep->de_pmp->pm_dev)); 1956 return (0); 1957 } 1958 1959 static int 1960 msdosfs_pathconf(ap) 1961 struct vop_pathconf_args /* { 1962 struct vnode *a_vp; 1963 int a_name; 1964 int *a_retval; 1965 } */ *ap; 1966 { 1967 struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp; 1968 1969 switch (ap->a_name) { 1970 case _PC_LINK_MAX: 1971 *ap->a_retval = 1; 1972 return (0); 1973 case _PC_NAME_MAX: 1974 *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12; 1975 return (0); 1976 case _PC_PATH_MAX: 1977 *ap->a_retval = PATH_MAX; 1978 return (0); 1979 case _PC_CHOWN_RESTRICTED: 1980 *ap->a_retval = 1; 1981 return (0); 1982 case _PC_NO_TRUNC: 1983 *ap->a_retval = 0; 1984 return (0); 1985 default: 1986 return (EINVAL); 1987 } 1988 /* NOTREACHED */ 1989 } 1990 1991 static int 1992 msdosfs_vptofh(ap) 1993 struct vop_vptofh_args /* { 1994 struct vnode *a_vp; 1995 struct fid *a_fhp; 1996 } */ *ap; 1997 { 1998 struct denode *dep; 1999 struct defid *defhp; 2000 2001 dep = VTODE(ap->a_vp); 2002 defhp = (struct defid *)ap->a_fhp; 2003 defhp->defid_len = sizeof(struct defid); 2004 defhp->defid_dirclust = dep->de_dirclust; 2005 defhp->defid_dirofs = dep->de_diroffset; 2006 /* defhp->defid_gen = dep->de_gen; */ 2007 return (0); 2008 } 2009 2010 /* Global vfs data structures for msdosfs */ 2011 struct vop_vector msdosfs_vnodeops = { 2012 .vop_default = &default_vnodeops, 2013 2014 .vop_access = msdosfs_access, 2015 .vop_bmap = msdosfs_bmap, 2016 .vop_cachedlookup = msdosfs_lookup, 2017 .vop_open = msdosfs_open, 2018 .vop_close = msdosfs_close, 2019 .vop_create = msdosfs_create, 2020 .vop_fsync = msdosfs_fsync, 2021 .vop_getattr = msdosfs_getattr, 2022 .vop_inactive = msdosfs_inactive, 2023 .vop_link = msdosfs_link, 2024 .vop_lookup = vfs_cache_lookup, 2025 .vop_mkdir = msdosfs_mkdir, 2026 .vop_mknod = msdosfs_mknod, 2027 .vop_pathconf = msdosfs_pathconf, 2028 .vop_print = msdosfs_print, 2029 .vop_read = msdosfs_read, 2030 .vop_readdir = msdosfs_readdir, 2031 .vop_reclaim = msdosfs_reclaim, 2032 .vop_remove = msdosfs_remove, 2033 .vop_rename = msdosfs_rename, 2034 .vop_rmdir = msdosfs_rmdir, 2035 .vop_setattr = msdosfs_setattr, 2036 .vop_strategy = msdosfs_strategy, 2037 .vop_symlink = msdosfs_symlink, 2038 .vop_write = msdosfs_write, 2039 .vop_vptofh = msdosfs_vptofh, 2040 };
Cache object: 9904c6ad0a7e5dac72475da29df99eef
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