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sys/fs/msdosfs/msdosfs_vnops.c
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1 /* $FreeBSD$ */ 2 /* $NetBSD: msdosfs_vnops.c,v 1.68 1998/02/10 14:10:04 mrg Exp $ */ 3 4 /*- 5 * 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 = (ap->a_vap->va_mode & VWRITE) ? 176 ATTR_ARCHIVE : ATTR_ARCHIVE | ATTR_READONLY; 177 ndirent.de_LowerCase = 0; 178 ndirent.de_StartCluster = 0; 179 ndirent.de_FileSize = 0; 180 ndirent.de_pmp = pdep->de_pmp; 181 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 182 getnanotime(&ts); 183 DETIMES(&ndirent, &ts, &ts, &ts); 184 error = createde(&ndirent, pdep, &dep, cnp); 185 if (error) 186 goto bad; 187 *ap->a_vpp = DETOV(dep); 188 return (0); 189 190 bad: 191 return (error); 192 } 193 194 static int 195 msdosfs_mknod(ap) 196 struct vop_mknod_args /* { 197 struct vnode *a_dvp; 198 struct vnode **a_vpp; 199 struct componentname *a_cnp; 200 struct vattr *a_vap; 201 } */ *ap; 202 { 203 204 return (EINVAL); 205 } 206 207 static int 208 msdosfs_open(ap) 209 struct vop_open_args /* { 210 struct vnode *a_vp; 211 int a_mode; 212 struct ucred *a_cred; 213 struct thread *a_td; 214 struct file *a_fp; 215 } */ *ap; 216 { 217 struct denode *dep = VTODE(ap->a_vp); 218 vnode_create_vobject(ap->a_vp, dep->de_FileSize, ap->a_td); 219 return 0; 220 } 221 222 static int 223 msdosfs_close(ap) 224 struct vop_close_args /* { 225 struct vnode *a_vp; 226 int a_fflag; 227 struct ucred *a_cred; 228 struct thread *a_td; 229 } */ *ap; 230 { 231 struct vnode *vp = ap->a_vp; 232 struct denode *dep = VTODE(vp); 233 struct timespec ts; 234 235 VI_LOCK(vp); 236 if (vp->v_usecount > 1) { 237 getnanotime(&ts); 238 DETIMES(dep, &ts, &ts, &ts); 239 } 240 VI_UNLOCK(vp); 241 return 0; 242 } 243 244 static int 245 msdosfs_access(ap) 246 struct vop_access_args /* { 247 struct vnode *a_vp; 248 accmode_t a_accmode; 249 struct ucred *a_cred; 250 struct thread *a_td; 251 } */ *ap; 252 { 253 struct vnode *vp = ap->a_vp; 254 struct denode *dep = VTODE(ap->a_vp); 255 struct msdosfsmount *pmp = dep->de_pmp; 256 mode_t file_mode; 257 accmode_t accmode = ap->a_accmode; 258 259 file_mode = (S_IXUSR|S_IXGRP|S_IXOTH) | (S_IRUSR|S_IRGRP|S_IROTH) | 260 ((dep->de_Attributes & ATTR_READONLY) ? 0 : (S_IWUSR|S_IWGRP|S_IWOTH)); 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 VDIR: 270 case VREG: 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 if ((dep->de_Attributes & ATTR_READONLY) == 0) 326 mode = S_IRWXU|S_IRWXG|S_IRWXO; 327 else 328 mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 329 vap->va_mode = mode & 330 (ap->a_vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); 331 vap->va_uid = pmp->pm_uid; 332 vap->va_gid = pmp->pm_gid; 333 vap->va_nlink = 1; 334 vap->va_rdev = NODEV; 335 vap->va_size = dep->de_FileSize; 336 fattime2timespec(dep->de_MDate, dep->de_MTime, 0, 0, &vap->va_mtime); 337 vap->va_ctime = vap->va_mtime; 338 if (pmp->pm_flags & MSDOSFSMNT_LONGNAME) { 339 fattime2timespec(dep->de_ADate, 0, 0, 0, &vap->va_atime); 340 fattime2timespec(dep->de_CDate, dep->de_CTime, dep->de_CHun, 341 0, &vap->va_birthtime); 342 } else { 343 vap->va_atime = vap->va_mtime; 344 vap->va_birthtime.tv_sec = -1; 345 vap->va_birthtime.tv_nsec = 0; 346 } 347 vap->va_flags = 0; 348 if ((dep->de_Attributes & ATTR_ARCHIVE) == 0) 349 vap->va_flags |= SF_ARCHIVED; 350 vap->va_gen = 0; 351 vap->va_blocksize = pmp->pm_bpcluster; 352 vap->va_bytes = 353 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask; 354 vap->va_type = ap->a_vp->v_type; 355 vap->va_filerev = dep->de_modrev; 356 return (0); 357 } 358 359 static int 360 msdosfs_setattr(ap) 361 struct vop_setattr_args /* { 362 struct vnode *a_vp; 363 struct vattr *a_vap; 364 struct ucred *a_cred; 365 } */ *ap; 366 { 367 struct vnode *vp = ap->a_vp; 368 struct denode *dep = VTODE(ap->a_vp); 369 struct msdosfsmount *pmp = dep->de_pmp; 370 struct vattr *vap = ap->a_vap; 371 struct ucred *cred = ap->a_cred; 372 struct thread *td = curthread; 373 int error = 0; 374 375 #ifdef MSDOSFS_DEBUG 376 printf("msdosfs_setattr(): vp %p, vap %p, cred %p\n", 377 ap->a_vp, vap, cred); 378 #endif 379 380 /* 381 * Check for unsettable attributes. 382 */ 383 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 384 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 385 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 386 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 387 #ifdef MSDOSFS_DEBUG 388 printf("msdosfs_setattr(): returning EINVAL\n"); 389 printf(" va_type %d, va_nlink %x, va_fsid %lx, va_fileid %lx\n", 390 vap->va_type, vap->va_nlink, vap->va_fsid, vap->va_fileid); 391 printf(" va_blocksize %lx, va_rdev %x, va_bytes %qx, va_gen %lx\n", 392 vap->va_blocksize, vap->va_rdev, vap->va_bytes, vap->va_gen); 393 printf(" va_uid %x, va_gid %x\n", 394 vap->va_uid, vap->va_gid); 395 #endif 396 return (EINVAL); 397 } 398 if (vap->va_flags != VNOVAL) { 399 if (vp->v_mount->mnt_flag & MNT_RDONLY) 400 return (EROFS); 401 if (cred->cr_uid != pmp->pm_uid) { 402 error = priv_check_cred(cred, PRIV_VFS_ADMIN, 0); 403 if (error) 404 return (error); 405 } 406 /* 407 * We are very inconsistent about handling unsupported 408 * attributes. We ignored the access time and the 409 * read and execute bits. We were strict for the other 410 * attributes. 411 * 412 * Here we are strict, stricter than ufs in not allowing 413 * users to attempt to set SF_SETTABLE bits or anyone to 414 * set unsupported bits. However, we ignore attempts to 415 * set ATTR_ARCHIVE for directories `cp -pr' from a more 416 * sensible filesystem attempts it a lot. 417 */ 418 if (vap->va_flags & SF_SETTABLE) { 419 error = priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0); 420 if (error) 421 return (error); 422 } 423 if (vap->va_flags & ~SF_ARCHIVED) 424 return EOPNOTSUPP; 425 if (vap->va_flags & SF_ARCHIVED) 426 dep->de_Attributes &= ~ATTR_ARCHIVE; 427 else if (!(dep->de_Attributes & ATTR_DIRECTORY)) 428 dep->de_Attributes |= ATTR_ARCHIVE; 429 dep->de_flag |= DE_MODIFIED; 430 } 431 432 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 433 uid_t uid; 434 gid_t gid; 435 436 if (vp->v_mount->mnt_flag & MNT_RDONLY) 437 return (EROFS); 438 uid = vap->va_uid; 439 if (uid == (uid_t)VNOVAL) 440 uid = pmp->pm_uid; 441 gid = vap->va_gid; 442 if (gid == (gid_t)VNOVAL) 443 gid = pmp->pm_gid; 444 if (cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid || 445 (gid != pmp->pm_gid && !groupmember(gid, cred))) { 446 error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0); 447 if (error) 448 return (error); 449 } 450 if (uid != pmp->pm_uid || gid != pmp->pm_gid) 451 return EINVAL; 452 } 453 454 if (vap->va_size != VNOVAL) { 455 switch (vp->v_type) { 456 case VDIR: 457 return (EISDIR); 458 case VREG: 459 /* 460 * Truncation is only supported for regular files, 461 * Disallow it if the filesystem is read-only. 462 */ 463 if (vp->v_mount->mnt_flag & MNT_RDONLY) 464 return (EROFS); 465 break; 466 default: 467 /* 468 * According to POSIX, the result is unspecified 469 * for file types other than regular files, 470 * directories and shared memory objects. We 471 * don't support any file types except regular 472 * files and directories in this file system, so 473 * this (default) case is unreachable and can do 474 * anything. Keep falling through to detrunc() 475 * for now. 476 */ 477 break; 478 } 479 error = detrunc(dep, vap->va_size, 0, cred, td); 480 if (error) 481 return error; 482 } 483 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 484 if (vp->v_mount->mnt_flag & MNT_RDONLY) 485 return (EROFS); 486 if (vap->va_vaflags & VA_UTIMES_NULL) { 487 error = VOP_ACCESS(vp, VADMIN, cred, td); 488 if (error) 489 error = VOP_ACCESS(vp, VWRITE, cred, td); 490 } else 491 error = VOP_ACCESS(vp, VADMIN, cred, td); 492 if (vp->v_type != VDIR) { 493 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 && 494 vap->va_atime.tv_sec != VNOVAL) { 495 dep->de_flag &= ~DE_ACCESS; 496 timespec2fattime(&vap->va_atime, 0, 497 &dep->de_ADate, NULL, NULL); 498 } 499 if (vap->va_mtime.tv_sec != VNOVAL) { 500 dep->de_flag &= ~DE_UPDATE; 501 timespec2fattime(&vap->va_mtime, 0, 502 &dep->de_MDate, &dep->de_MTime, NULL); 503 } 504 dep->de_Attributes |= ATTR_ARCHIVE; 505 dep->de_flag |= DE_MODIFIED; 506 } 507 } 508 /* 509 * DOS files only have the ability to have their writability 510 * attribute set, so we use the owner write bit to set the readonly 511 * attribute. 512 */ 513 if (vap->va_mode != (mode_t)VNOVAL) { 514 if (vp->v_mount->mnt_flag & MNT_RDONLY) 515 return (EROFS); 516 if (cred->cr_uid != pmp->pm_uid) { 517 error = priv_check_cred(cred, PRIV_VFS_ADMIN, 0); 518 if (error) 519 return (error); 520 } 521 if (vp->v_type != VDIR) { 522 /* We ignore the read and execute bits. */ 523 if (vap->va_mode & VWRITE) 524 dep->de_Attributes &= ~ATTR_READONLY; 525 else 526 dep->de_Attributes |= ATTR_READONLY; 527 dep->de_Attributes |= ATTR_ARCHIVE; 528 dep->de_flag |= DE_MODIFIED; 529 } 530 } 531 return (deupdat(dep, 0)); 532 } 533 534 static int 535 msdosfs_read(ap) 536 struct vop_read_args /* { 537 struct vnode *a_vp; 538 struct uio *a_uio; 539 int a_ioflag; 540 struct ucred *a_cred; 541 } */ *ap; 542 { 543 int error = 0; 544 int blsize; 545 int isadir; 546 ssize_t orig_resid; 547 u_int n; 548 u_long diff; 549 u_long on; 550 daddr_t lbn; 551 daddr_t rablock; 552 int rasize; 553 int seqcount; 554 struct buf *bp; 555 struct vnode *vp = ap->a_vp; 556 struct denode *dep = VTODE(vp); 557 struct msdosfsmount *pmp = dep->de_pmp; 558 struct uio *uio = ap->a_uio; 559 560 /* 561 * If they didn't ask for any data, then we are done. 562 */ 563 orig_resid = uio->uio_resid; 564 if (orig_resid == 0) 565 return (0); 566 567 /* 568 * The caller is supposed to ensure that 569 * uio->uio_offset >= 0 and uio->uio_resid >= 0. 570 * We don't need to check for large offsets as in ffs because 571 * dep->de_FileSize <= DOS_FILESIZE_MAX < OFF_MAX, so large 572 * offsets cannot cause overflow even in theory. 573 */ 574 575 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 576 577 isadir = dep->de_Attributes & ATTR_DIRECTORY; 578 do { 579 if (uio->uio_offset >= dep->de_FileSize) 580 break; 581 lbn = de_cluster(pmp, uio->uio_offset); 582 rablock = lbn + 1; 583 blsize = pmp->pm_bpcluster; 584 on = uio->uio_offset & pmp->pm_crbomask; 585 /* 586 * If we are operating on a directory file then be sure to 587 * do i/o with the vnode for the filesystem instead of the 588 * vnode for the directory. 589 */ 590 if (isadir) { 591 /* convert cluster # to block # */ 592 error = pcbmap(dep, lbn, &lbn, 0, &blsize); 593 if (error == E2BIG) { 594 error = EINVAL; 595 break; 596 } else if (error) 597 break; 598 error = bread(pmp->pm_devvp, lbn, blsize, NOCRED, &bp); 599 } else if (de_cn2off(pmp, rablock) >= dep->de_FileSize) { 600 error = bread(vp, lbn, blsize, NOCRED, &bp); 601 } else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) { 602 error = cluster_read(vp, dep->de_FileSize, lbn, blsize, 603 NOCRED, on + uio->uio_resid, seqcount, &bp); 604 } else if (seqcount > 1) { 605 rasize = blsize; 606 error = breadn(vp, lbn, 607 blsize, &rablock, &rasize, 1, NOCRED, &bp); 608 } else { 609 error = bread(vp, lbn, blsize, NOCRED, &bp); 610 } 611 if (error) { 612 brelse(bp); 613 break; 614 } 615 diff = pmp->pm_bpcluster - on; 616 n = diff > uio->uio_resid ? uio->uio_resid : diff; 617 diff = dep->de_FileSize - uio->uio_offset; 618 if (diff < n) 619 n = diff; 620 diff = blsize - bp->b_resid; 621 if (diff < n) 622 n = diff; 623 error = uiomove(bp->b_data + on, (int) n, uio); 624 brelse(bp); 625 } while (error == 0 && uio->uio_resid > 0 && n != 0); 626 if (!isadir && (error == 0 || uio->uio_resid != orig_resid) && 627 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 628 dep->de_flag |= DE_ACCESS; 629 return (error); 630 } 631 632 /* 633 * Write data to a file or directory. 634 */ 635 static int 636 msdosfs_write(ap) 637 struct vop_write_args /* { 638 struct vnode *a_vp; 639 struct uio *a_uio; 640 int a_ioflag; 641 struct ucred *a_cred; 642 } */ *ap; 643 { 644 int n; 645 int croffset; 646 ssize_t resid; 647 u_long osize; 648 int error = 0; 649 u_long count; 650 int seqcount; 651 daddr_t bn, lastcn; 652 struct buf *bp; 653 int ioflag = ap->a_ioflag; 654 struct uio *uio = ap->a_uio; 655 struct vnode *vp = ap->a_vp; 656 struct vnode *thisvp; 657 struct denode *dep = VTODE(vp); 658 struct msdosfsmount *pmp = dep->de_pmp; 659 struct ucred *cred = ap->a_cred; 660 661 #ifdef MSDOSFS_DEBUG 662 printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n", 663 vp, uio, ioflag, cred); 664 printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n", 665 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster); 666 #endif 667 668 switch (vp->v_type) { 669 case VREG: 670 if (ioflag & IO_APPEND) 671 uio->uio_offset = dep->de_FileSize; 672 thisvp = vp; 673 break; 674 case VDIR: 675 return EISDIR; 676 default: 677 panic("msdosfs_write(): bad file type"); 678 } 679 680 /* 681 * This is needed (unlike in ffs_write()) because we extend the 682 * file outside of the loop but we don't want to extend the file 683 * for writes of 0 bytes. 684 */ 685 if (uio->uio_resid == 0) 686 return (0); 687 688 /* 689 * The caller is supposed to ensure that 690 * uio->uio_offset >= 0 and uio->uio_resid >= 0. 691 */ 692 if ((uoff_t)uio->uio_offset + uio->uio_resid > DOS_FILESIZE_MAX) 693 return (EFBIG); 694 695 /* 696 * If they've exceeded their filesize limit, tell them about it. 697 */ 698 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 699 return (EFBIG); 700 701 /* 702 * If the offset we are starting the write at is beyond the end of 703 * the file, then they've done a seek. Unix filesystems allow 704 * files with holes in them, DOS doesn't so we must fill the hole 705 * with zeroed blocks. 706 */ 707 if (uio->uio_offset > dep->de_FileSize) { 708 error = deextend(dep, uio->uio_offset, cred); 709 if (error) 710 return (error); 711 } 712 713 /* 714 * Remember some values in case the write fails. 715 */ 716 resid = uio->uio_resid; 717 osize = dep->de_FileSize; 718 719 /* 720 * If we write beyond the end of the file, extend it to its ultimate 721 * size ahead of the time to hopefully get a contiguous area. 722 */ 723 if (uio->uio_offset + resid > osize) { 724 count = de_clcount(pmp, uio->uio_offset + resid) - 725 de_clcount(pmp, osize); 726 error = extendfile(dep, count, NULL, NULL, 0); 727 if (error && (error != ENOSPC || (ioflag & IO_UNIT))) 728 goto errexit; 729 lastcn = dep->de_fc[FC_LASTFC].fc_frcn; 730 } else 731 lastcn = de_clcount(pmp, osize) - 1; 732 733 seqcount = ioflag >> IO_SEQSHIFT; 734 do { 735 if (de_cluster(pmp, uio->uio_offset) > lastcn) { 736 error = ENOSPC; 737 break; 738 } 739 740 croffset = uio->uio_offset & pmp->pm_crbomask; 741 n = min(uio->uio_resid, pmp->pm_bpcluster - croffset); 742 if (uio->uio_offset + n > dep->de_FileSize) { 743 dep->de_FileSize = uio->uio_offset + n; 744 /* The object size needs to be set before buffer is allocated */ 745 vnode_pager_setsize(vp, dep->de_FileSize); 746 } 747 748 bn = de_cluster(pmp, uio->uio_offset); 749 if ((uio->uio_offset & pmp->pm_crbomask) == 0 750 && (de_cluster(pmp, uio->uio_offset + uio->uio_resid) 751 > de_cluster(pmp, uio->uio_offset) 752 || uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) { 753 /* 754 * If either the whole cluster gets written, 755 * or we write the cluster from its start beyond EOF, 756 * then no need to read data from disk. 757 */ 758 bp = getblk(thisvp, bn, pmp->pm_bpcluster, 0, 0, 0); 759 vfs_bio_clrbuf(bp); 760 /* 761 * Do the bmap now, since pcbmap needs buffers 762 * for the fat table. (see msdosfs_strategy) 763 */ 764 if (bp->b_blkno == bp->b_lblkno) { 765 error = pcbmap(dep, bp->b_lblkno, &bn, 0, 0); 766 if (error) 767 bp->b_blkno = -1; 768 else 769 bp->b_blkno = bn; 770 } 771 if (bp->b_blkno == -1) { 772 brelse(bp); 773 if (!error) 774 error = EIO; /* XXX */ 775 break; 776 } 777 } else { 778 /* 779 * The block we need to write into exists, so read it in. 780 */ 781 error = bread(thisvp, bn, pmp->pm_bpcluster, cred, &bp); 782 if (error) { 783 brelse(bp); 784 break; 785 } 786 } 787 788 /* 789 * Should these vnode_pager_* functions be done on dir 790 * files? 791 */ 792 793 /* 794 * Copy the data from user space into the buf header. 795 */ 796 error = uiomove(bp->b_data + croffset, n, uio); 797 if (error) { 798 brelse(bp); 799 break; 800 } 801 802 /* Prepare for clustered writes in some else clauses. */ 803 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) 804 bp->b_flags |= B_CLUSTEROK; 805 806 /* 807 * If IO_SYNC, then each buffer is written synchronously. 808 * Otherwise, if we have a severe page deficiency then 809 * write the buffer asynchronously. Otherwise, if on a 810 * cluster boundary then write the buffer asynchronously, 811 * combining it with contiguous clusters if permitted and 812 * possible, since we don't expect more writes into this 813 * buffer soon. Otherwise, do a delayed write because we 814 * expect more writes into this buffer soon. 815 */ 816 if (ioflag & IO_SYNC) 817 (void)bwrite(bp); 818 else if (vm_page_count_severe() || buf_dirty_count_severe()) 819 bawrite(bp); 820 else if (n + croffset == pmp->pm_bpcluster) { 821 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) 822 cluster_write(vp, bp, dep->de_FileSize, 823 seqcount); 824 else 825 bawrite(bp); 826 } else 827 bdwrite(bp); 828 dep->de_flag |= DE_UPDATE; 829 } while (error == 0 && uio->uio_resid > 0); 830 831 /* 832 * If the write failed and they want us to, truncate the file back 833 * to the size it was before the write was attempted. 834 */ 835 errexit: 836 if (error) { 837 if (ioflag & IO_UNIT) { 838 detrunc(dep, osize, ioflag & IO_SYNC, NOCRED, NULL); 839 uio->uio_offset -= resid - uio->uio_resid; 840 uio->uio_resid = resid; 841 } else { 842 detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC, NOCRED, NULL); 843 if (uio->uio_resid != resid) 844 error = 0; 845 } 846 } else if (ioflag & IO_SYNC) 847 error = deupdat(dep, 1); 848 return (error); 849 } 850 851 /* 852 * Flush the blocks of a file to disk. 853 */ 854 static int 855 msdosfs_fsync(ap) 856 struct vop_fsync_args /* { 857 struct vnode *a_vp; 858 struct ucred *a_cred; 859 int a_waitfor; 860 struct thread *a_td; 861 } */ *ap; 862 { 863 struct vnode *devvp; 864 int allerror, error; 865 866 vop_stdfsync(ap); 867 868 /* 869 * If the syncing request comes from fsync(2), sync the entire 870 * FAT and any other metadata that happens to be on devvp. We 871 * need this mainly for the FAT. We write the FAT sloppily, and 872 * syncing it all now is the best we can easily do to get all 873 * directory entries associated with the file (not just the file) 874 * fully synced. The other metadata includes critical metadata 875 * for all directory entries, but only in the MNT_ASYNC case. We 876 * will soon sync all metadata in the file's directory entry. 877 * Non-critical metadata for associated directory entries only 878 * gets synced accidentally, as in most file systems. 879 */ 880 if (ap->a_waitfor == MNT_WAIT) { 881 devvp = VTODE(ap->a_vp)->de_pmp->pm_devvp; 882 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 883 allerror = VOP_FSYNC(devvp, MNT_WAIT, ap->a_td); 884 VOP_UNLOCK(devvp, 0); 885 } else 886 allerror = 0; 887 888 error = deupdat(VTODE(ap->a_vp), ap->a_waitfor == MNT_WAIT); 889 if (allerror == 0) 890 allerror = error; 891 return (allerror); 892 } 893 894 static int 895 msdosfs_remove(ap) 896 struct vop_remove_args /* { 897 struct vnode *a_dvp; 898 struct vnode *a_vp; 899 struct componentname *a_cnp; 900 } */ *ap; 901 { 902 struct denode *dep = VTODE(ap->a_vp); 903 struct denode *ddep = VTODE(ap->a_dvp); 904 int error; 905 906 if (ap->a_vp->v_type == VDIR) 907 error = EPERM; 908 else 909 error = removede(ddep, dep); 910 #ifdef MSDOSFS_DEBUG 911 printf("msdosfs_remove(), dep %p, v_usecount %d\n", dep, ap->a_vp->v_usecount); 912 #endif 913 return (error); 914 } 915 916 /* 917 * DOS filesystems don't know what links are. 918 */ 919 static int 920 msdosfs_link(ap) 921 struct vop_link_args /* { 922 struct vnode *a_tdvp; 923 struct vnode *a_vp; 924 struct componentname *a_cnp; 925 } */ *ap; 926 { 927 return (EOPNOTSUPP); 928 } 929 930 /* 931 * Renames on files require moving the denode to a new hash queue since the 932 * denode's location is used to compute which hash queue to put the file 933 * in. Unless it is a rename in place. For example "mv a b". 934 * 935 * What follows is the basic algorithm: 936 * 937 * if (file move) { 938 * if (dest file exists) { 939 * remove dest file 940 * } 941 * if (dest and src in same directory) { 942 * rewrite name in existing directory slot 943 * } else { 944 * write new entry in dest directory 945 * update offset and dirclust in denode 946 * move denode to new hash chain 947 * clear old directory entry 948 * } 949 * } else { 950 * directory move 951 * if (dest directory exists) { 952 * if (dest is not empty) { 953 * return ENOTEMPTY 954 * } 955 * remove dest directory 956 * } 957 * if (dest and src in same directory) { 958 * rewrite name in existing entry 959 * } else { 960 * be sure dest is not a child of src directory 961 * write entry in dest directory 962 * update "." and ".." in moved directory 963 * clear old directory entry for moved directory 964 * } 965 * } 966 * 967 * On entry: 968 * source's parent directory is unlocked 969 * source file or directory is unlocked 970 * destination's parent directory is locked 971 * destination file or directory is locked if it exists 972 * 973 * On exit: 974 * all denodes should be released 975 */ 976 static int 977 msdosfs_rename(ap) 978 struct vop_rename_args /* { 979 struct vnode *a_fdvp; 980 struct vnode *a_fvp; 981 struct componentname *a_fcnp; 982 struct vnode *a_tdvp; 983 struct vnode *a_tvp; 984 struct componentname *a_tcnp; 985 } */ *ap; 986 { 987 struct vnode *tdvp = ap->a_tdvp; 988 struct vnode *fvp = ap->a_fvp; 989 struct vnode *fdvp = ap->a_fdvp; 990 struct vnode *tvp = ap->a_tvp; 991 struct componentname *tcnp = ap->a_tcnp; 992 struct componentname *fcnp = ap->a_fcnp; 993 struct denode *ip, *xp, *dp, *zp; 994 u_char toname[12], oldname[11]; 995 u_long from_diroffset, to_diroffset; 996 u_char to_count; 997 int doingdirectory = 0, newparent = 0; 998 int error; 999 u_long cn, pcl; 1000 daddr_t bn; 1001 struct denode *fddep; /* from file's parent directory */ 1002 struct msdosfsmount *pmp; 1003 struct direntry *dotdotp; 1004 struct buf *bp; 1005 1006 fddep = VTODE(ap->a_fdvp); 1007 pmp = fddep->de_pmp; 1008 1009 pmp = VFSTOMSDOSFS(fdvp->v_mount); 1010 1011 #ifdef DIAGNOSTIC 1012 if ((tcnp->cn_flags & HASBUF) == 0 || 1013 (fcnp->cn_flags & HASBUF) == 0) 1014 panic("msdosfs_rename: no name"); 1015 #endif 1016 /* 1017 * Check for cross-device rename. 1018 */ 1019 if (fvp->v_mount != tdvp->v_mount || 1020 (tvp && fvp->v_mount != tvp->v_mount)) { 1021 error = EXDEV; 1022 abortit: 1023 if (tdvp == tvp) 1024 vrele(tdvp); 1025 else 1026 vput(tdvp); 1027 if (tvp) 1028 vput(tvp); 1029 vrele(fdvp); 1030 vrele(fvp); 1031 return (error); 1032 } 1033 1034 /* 1035 * If source and dest are the same, do nothing. 1036 */ 1037 if (tvp == fvp) { 1038 error = 0; 1039 goto abortit; 1040 } 1041 1042 error = vn_lock(fvp, LK_EXCLUSIVE); 1043 if (error) 1044 goto abortit; 1045 dp = VTODE(fdvp); 1046 ip = VTODE(fvp); 1047 1048 /* 1049 * Be sure we are not renaming ".", "..", or an alias of ".". This 1050 * leads to a crippled directory tree. It's pretty tough to do a 1051 * "ls" or "pwd" with the "." directory entry missing, and "cd .." 1052 * doesn't work if the ".." entry is missing. 1053 */ 1054 if (ip->de_Attributes & ATTR_DIRECTORY) { 1055 /* 1056 * Avoid ".", "..", and aliases of "." for obvious reasons. 1057 */ 1058 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 1059 dp == ip || 1060 (fcnp->cn_flags & ISDOTDOT) || 1061 (tcnp->cn_flags & ISDOTDOT) || 1062 (ip->de_flag & DE_RENAME)) { 1063 VOP_UNLOCK(fvp, 0); 1064 error = EINVAL; 1065 goto abortit; 1066 } 1067 ip->de_flag |= DE_RENAME; 1068 doingdirectory++; 1069 } 1070 1071 /* 1072 * When the target exists, both the directory 1073 * and target vnodes are returned locked. 1074 */ 1075 dp = VTODE(tdvp); 1076 xp = tvp ? VTODE(tvp) : NULL; 1077 /* 1078 * Remember direntry place to use for destination 1079 */ 1080 to_diroffset = dp->de_fndoffset; 1081 to_count = dp->de_fndcnt; 1082 1083 /* 1084 * If ".." must be changed (ie the directory gets a new 1085 * parent) then the source directory must not be in the 1086 * directory hierarchy above the target, as this would 1087 * orphan everything below the source directory. Also 1088 * the user must have write permission in the source so 1089 * as to be able to change "..". We must repeat the call 1090 * to namei, as the parent directory is unlocked by the 1091 * call to doscheckpath(). 1092 */ 1093 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread); 1094 VOP_UNLOCK(fvp, 0); 1095 if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster) 1096 newparent = 1; 1097 if (doingdirectory && newparent) { 1098 if (error) /* write access check above */ 1099 goto bad; 1100 if (xp != NULL) 1101 vput(tvp); 1102 /* 1103 * doscheckpath() vput()'s dp, 1104 * so we have to do a relookup afterwards 1105 */ 1106 error = doscheckpath(ip, dp); 1107 if (error) 1108 goto out; 1109 if ((tcnp->cn_flags & SAVESTART) == 0) 1110 panic("msdosfs_rename: lost to startdir"); 1111 error = relookup(tdvp, &tvp, tcnp); 1112 if (error) 1113 goto out; 1114 dp = VTODE(tdvp); 1115 xp = tvp ? VTODE(tvp) : NULL; 1116 } 1117 1118 if (xp != NULL) { 1119 /* 1120 * Target must be empty if a directory and have no links 1121 * to it. Also, ensure source and target are compatible 1122 * (both directories, or both not directories). 1123 */ 1124 if (xp->de_Attributes & ATTR_DIRECTORY) { 1125 if (!dosdirempty(xp)) { 1126 error = ENOTEMPTY; 1127 goto bad; 1128 } 1129 if (!doingdirectory) { 1130 error = ENOTDIR; 1131 goto bad; 1132 } 1133 cache_purge(tdvp); 1134 } else if (doingdirectory) { 1135 error = EISDIR; 1136 goto bad; 1137 } 1138 error = removede(dp, xp); 1139 if (error) 1140 goto bad; 1141 vput(tvp); 1142 xp = NULL; 1143 } 1144 1145 /* 1146 * Convert the filename in tcnp into a dos filename. We copy this 1147 * into the denode and directory entry for the destination 1148 * file/directory. 1149 */ 1150 error = uniqdosname(VTODE(tdvp), tcnp, toname); 1151 if (error) 1152 goto abortit; 1153 1154 /* 1155 * Since from wasn't locked at various places above, 1156 * have to do a relookup here. 1157 */ 1158 fcnp->cn_flags &= ~MODMASK; 1159 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 1160 if ((fcnp->cn_flags & SAVESTART) == 0) 1161 panic("msdosfs_rename: lost from startdir"); 1162 if (!newparent) 1163 VOP_UNLOCK(tdvp, 0); 1164 if (relookup(fdvp, &fvp, fcnp) == 0) 1165 vrele(fdvp); 1166 if (fvp == NULL) { 1167 /* 1168 * From name has disappeared. 1169 */ 1170 if (doingdirectory) 1171 panic("rename: lost dir entry"); 1172 if (newparent) 1173 VOP_UNLOCK(tdvp, 0); 1174 vrele(tdvp); 1175 vrele(ap->a_fvp); 1176 return 0; 1177 } 1178 xp = VTODE(fvp); 1179 zp = VTODE(fdvp); 1180 from_diroffset = zp->de_fndoffset; 1181 1182 /* 1183 * Ensure that the directory entry still exists and has not 1184 * changed till now. If the source is a file the entry may 1185 * have been unlinked or renamed. In either case there is 1186 * no further work to be done. If the source is a directory 1187 * then it cannot have been rmdir'ed or renamed; this is 1188 * prohibited by the DE_RENAME flag. 1189 */ 1190 if (xp != ip) { 1191 if (doingdirectory) 1192 panic("rename: lost dir entry"); 1193 VOP_UNLOCK(fvp, 0); 1194 if (newparent) 1195 VOP_UNLOCK(fdvp, 0); 1196 vrele(ap->a_fvp); 1197 xp = NULL; 1198 } else { 1199 vrele(fvp); 1200 xp = NULL; 1201 1202 /* 1203 * First write a new entry in the destination 1204 * directory and mark the entry in the source directory 1205 * as deleted. Then move the denode to the correct hash 1206 * chain for its new location in the filesystem. And, if 1207 * we moved a directory, then update its .. entry to point 1208 * to the new parent directory. 1209 */ 1210 bcopy(ip->de_Name, oldname, 11); 1211 bcopy(toname, ip->de_Name, 11); /* update denode */ 1212 dp->de_fndoffset = to_diroffset; 1213 dp->de_fndcnt = to_count; 1214 error = createde(ip, dp, (struct denode **)0, tcnp); 1215 if (error) { 1216 bcopy(oldname, ip->de_Name, 11); 1217 if (newparent) 1218 VOP_UNLOCK(fdvp, 0); 1219 VOP_UNLOCK(fvp, 0); 1220 goto bad; 1221 } 1222 /* 1223 * If ip is for a directory, then its name should always 1224 * be "." since it is for the directory entry in the 1225 * directory itself (msdosfs_lookup() always translates 1226 * to the "." entry so as to get a unique denode, except 1227 * for the root directory there are different 1228 * complications). However, we just corrupted its name 1229 * to pass the correct name to createde(). Undo this. 1230 */ 1231 if ((ip->de_Attributes & ATTR_DIRECTORY) != 0) 1232 bcopy(oldname, ip->de_Name, 11); 1233 ip->de_refcnt++; 1234 zp->de_fndoffset = from_diroffset; 1235 error = removede(zp, ip); 1236 if (error) { 1237 /* XXX should downgrade to ro here, fs is corrupt */ 1238 if (newparent) 1239 VOP_UNLOCK(fdvp, 0); 1240 VOP_UNLOCK(fvp, 0); 1241 goto bad; 1242 } 1243 if (!doingdirectory) { 1244 error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0, 1245 &ip->de_dirclust, 0); 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 (ip->de_dirclust == MSDOSFSROOT) 1254 ip->de_diroffset = to_diroffset; 1255 else 1256 ip->de_diroffset = to_diroffset & pmp->pm_crbomask; 1257 } 1258 reinsert(ip); 1259 if (newparent) 1260 VOP_UNLOCK(fdvp, 0); 1261 } 1262 1263 /* 1264 * If we moved a directory to a new parent directory, then we must 1265 * fixup the ".." entry in the moved directory. 1266 */ 1267 if (doingdirectory && newparent) { 1268 cn = ip->de_StartCluster; 1269 if (cn == MSDOSFSROOT) { 1270 /* this should never happen */ 1271 panic("msdosfs_rename(): updating .. in root directory?"); 1272 } else 1273 bn = cntobn(pmp, cn); 1274 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, 1275 NOCRED, &bp); 1276 if (error) { 1277 /* XXX should downgrade to ro here, fs is corrupt */ 1278 brelse(bp); 1279 VOP_UNLOCK(fvp, 0); 1280 goto bad; 1281 } 1282 dotdotp = (struct direntry *)bp->b_data + 1; 1283 pcl = dp->de_StartCluster; 1284 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1285 pcl = MSDOSFSROOT; 1286 putushort(dotdotp->deStartCluster, pcl); 1287 if (FAT32(pmp)) 1288 putushort(dotdotp->deHighClust, pcl >> 16); 1289 if (DOINGASYNC(fvp)) 1290 bdwrite(bp); 1291 else if ((error = bwrite(bp)) != 0) { 1292 /* XXX should downgrade to ro here, fs is corrupt */ 1293 VOP_UNLOCK(fvp, 0); 1294 goto bad; 1295 } 1296 } 1297 1298 /* 1299 * The msdosfs lookup is case insensitive. Several aliases may 1300 * be inserted for a single directory entry. As a consequnce, 1301 * name cache purge done by lookup for fvp when DELETE op for 1302 * namei is specified, might be not enough to expunge all 1303 * namecache entries that were installed for this direntry. 1304 */ 1305 cache_purge(fvp); 1306 VOP_UNLOCK(fvp, 0); 1307 bad: 1308 if (xp) 1309 vput(tvp); 1310 vput(tdvp); 1311 out: 1312 ip->de_flag &= ~DE_RENAME; 1313 vrele(fdvp); 1314 vrele(fvp); 1315 return (error); 1316 1317 } 1318 1319 static struct { 1320 struct direntry dot; 1321 struct direntry dotdot; 1322 } dosdirtemplate = { 1323 { ". ", /* the . entry */ 1324 ATTR_DIRECTORY, /* file attribute */ 1325 0, /* reserved */ 1326 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1327 { 0, 0 }, /* access date */ 1328 { 0, 0 }, /* high bits of start cluster */ 1329 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1330 { 0, 0 }, /* startcluster */ 1331 { 0, 0, 0, 0 } /* filesize */ 1332 }, 1333 { ".. ", /* 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 }; 1344 1345 static int 1346 msdosfs_mkdir(ap) 1347 struct vop_mkdir_args /* { 1348 struct vnode *a_dvp; 1349 struct vnode **a_vpp; 1350 struvt componentname *a_cnp; 1351 struct vattr *a_vap; 1352 } */ *ap; 1353 { 1354 struct componentname *cnp = ap->a_cnp; 1355 struct denode *dep; 1356 struct denode *pdep = VTODE(ap->a_dvp); 1357 struct direntry *denp; 1358 struct msdosfsmount *pmp = pdep->de_pmp; 1359 struct buf *bp; 1360 u_long newcluster, pcl; 1361 int bn; 1362 int error; 1363 struct denode ndirent; 1364 struct timespec ts; 1365 1366 /* 1367 * If this is the root directory and there is no space left we 1368 * can't do anything. This is because the root directory can not 1369 * change size. 1370 */ 1371 if (pdep->de_StartCluster == MSDOSFSROOT 1372 && pdep->de_fndoffset >= pdep->de_FileSize) { 1373 error = ENOSPC; 1374 goto bad2; 1375 } 1376 1377 /* 1378 * Allocate a cluster to hold the about to be created directory. 1379 */ 1380 error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL); 1381 if (error) 1382 goto bad2; 1383 1384 bzero(&ndirent, sizeof(ndirent)); 1385 ndirent.de_pmp = pmp; 1386 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 1387 getnanotime(&ts); 1388 DETIMES(&ndirent, &ts, &ts, &ts); 1389 1390 /* 1391 * Now fill the cluster with the "." and ".." entries. And write 1392 * the cluster to disk. This way it is there for the parent 1393 * directory to be pointing at if there were a crash. 1394 */ 1395 bn = cntobn(pmp, newcluster); 1396 /* always succeeds */ 1397 bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0, 0); 1398 bzero(bp->b_data, pmp->pm_bpcluster); 1399 bcopy(&dosdirtemplate, bp->b_data, sizeof dosdirtemplate); 1400 denp = (struct direntry *)bp->b_data; 1401 putushort(denp[0].deStartCluster, newcluster); 1402 putushort(denp[0].deCDate, ndirent.de_CDate); 1403 putushort(denp[0].deCTime, ndirent.de_CTime); 1404 denp[0].deCHundredth = ndirent.de_CHun; 1405 putushort(denp[0].deADate, ndirent.de_ADate); 1406 putushort(denp[0].deMDate, ndirent.de_MDate); 1407 putushort(denp[0].deMTime, ndirent.de_MTime); 1408 pcl = pdep->de_StartCluster; 1409 /* 1410 * Although the root directory has a non-magic starting cluster 1411 * number for FAT32, chkdsk and fsck_msdosfs still require 1412 * references to it in dotdot entries to be magic. 1413 */ 1414 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1415 pcl = MSDOSFSROOT; 1416 putushort(denp[1].deStartCluster, pcl); 1417 putushort(denp[1].deCDate, ndirent.de_CDate); 1418 putushort(denp[1].deCTime, ndirent.de_CTime); 1419 denp[1].deCHundredth = ndirent.de_CHun; 1420 putushort(denp[1].deADate, ndirent.de_ADate); 1421 putushort(denp[1].deMDate, ndirent.de_MDate); 1422 putushort(denp[1].deMTime, ndirent.de_MTime); 1423 if (FAT32(pmp)) { 1424 putushort(denp[0].deHighClust, newcluster >> 16); 1425 putushort(denp[1].deHighClust, pcl >> 16); 1426 } 1427 1428 if (DOINGASYNC(ap->a_dvp)) 1429 bdwrite(bp); 1430 else if ((error = bwrite(bp)) != 0) 1431 goto bad; 1432 1433 /* 1434 * Now build up a directory entry pointing to the newly allocated 1435 * cluster. This will be written to an empty slot in the parent 1436 * directory. 1437 */ 1438 #ifdef DIAGNOSTIC 1439 if ((cnp->cn_flags & HASBUF) == 0) 1440 panic("msdosfs_mkdir: no name"); 1441 #endif 1442 error = uniqdosname(pdep, cnp, ndirent.de_Name); 1443 if (error) 1444 goto bad; 1445 1446 ndirent.de_Attributes = ATTR_DIRECTORY; 1447 ndirent.de_LowerCase = 0; 1448 ndirent.de_StartCluster = newcluster; 1449 ndirent.de_FileSize = 0; 1450 error = createde(&ndirent, pdep, &dep, cnp); 1451 if (error) 1452 goto bad; 1453 *ap->a_vpp = DETOV(dep); 1454 return (0); 1455 1456 bad: 1457 clusterfree(pmp, newcluster, NULL); 1458 bad2: 1459 return (error); 1460 } 1461 1462 static int 1463 msdosfs_rmdir(ap) 1464 struct vop_rmdir_args /* { 1465 struct vnode *a_dvp; 1466 struct vnode *a_vp; 1467 struct componentname *a_cnp; 1468 } */ *ap; 1469 { 1470 struct vnode *vp = ap->a_vp; 1471 struct vnode *dvp = ap->a_dvp; 1472 struct componentname *cnp = ap->a_cnp; 1473 struct denode *ip, *dp; 1474 struct thread *td = cnp->cn_thread; 1475 int error; 1476 1477 ip = VTODE(vp); 1478 dp = VTODE(dvp); 1479 1480 /* 1481 * Verify the directory is empty (and valid). 1482 * (Rmdir ".." won't be valid since 1483 * ".." will contain a reference to 1484 * the current directory and thus be 1485 * non-empty.) 1486 */ 1487 error = 0; 1488 if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) { 1489 error = ENOTEMPTY; 1490 goto out; 1491 } 1492 /* 1493 * Delete the entry from the directory. For dos filesystems this 1494 * gets rid of the directory entry on disk, the in memory copy 1495 * still exists but the de_refcnt is <= 0. This prevents it from 1496 * being found by deget(). When the vput() on dep is done we give 1497 * up access and eventually msdosfs_reclaim() will be called which 1498 * will remove it from the denode cache. 1499 */ 1500 error = removede(dp, ip); 1501 if (error) 1502 goto out; 1503 /* 1504 * This is where we decrement the link count in the parent 1505 * directory. Since dos filesystems don't do this we just purge 1506 * the name cache. 1507 */ 1508 cache_purge(dvp); 1509 /* 1510 * Truncate the directory that is being deleted. 1511 */ 1512 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred, td); 1513 cache_purge(vp); 1514 1515 out: 1516 return (error); 1517 } 1518 1519 /* 1520 * DOS filesystems don't know what symlinks are. 1521 */ 1522 static int 1523 msdosfs_symlink(ap) 1524 struct vop_symlink_args /* { 1525 struct vnode *a_dvp; 1526 struct vnode **a_vpp; 1527 struct componentname *a_cnp; 1528 struct vattr *a_vap; 1529 char *a_target; 1530 } */ *ap; 1531 { 1532 return (EOPNOTSUPP); 1533 } 1534 1535 static int 1536 msdosfs_readdir(ap) 1537 struct vop_readdir_args /* { 1538 struct vnode *a_vp; 1539 struct uio *a_uio; 1540 struct ucred *a_cred; 1541 int *a_eofflag; 1542 int *a_ncookies; 1543 u_long **a_cookies; 1544 } */ *ap; 1545 { 1546 struct mbnambuf nb; 1547 int error = 0; 1548 int diff; 1549 long n; 1550 int blsize; 1551 long on; 1552 u_long cn; 1553 uint64_t fileno; 1554 u_long dirsperblk; 1555 long bias = 0; 1556 daddr_t bn, lbn; 1557 struct buf *bp; 1558 struct denode *dep = VTODE(ap->a_vp); 1559 struct msdosfsmount *pmp = dep->de_pmp; 1560 struct direntry *dentp; 1561 struct dirent dirbuf; 1562 struct uio *uio = ap->a_uio; 1563 u_long *cookies = NULL; 1564 int ncookies = 0; 1565 off_t offset, off; 1566 int chksum = -1; 1567 1568 #ifdef MSDOSFS_DEBUG 1569 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n", 1570 ap->a_vp, uio, ap->a_cred, ap->a_eofflag); 1571 #endif 1572 1573 /* 1574 * msdosfs_readdir() won't operate properly on regular files since 1575 * it does i/o only with the filesystem vnode, and hence can 1576 * retrieve the wrong block from the buffer cache for a plain file. 1577 * So, fail attempts to readdir() on a plain file. 1578 */ 1579 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) 1580 return (ENOTDIR); 1581 1582 /* 1583 * To be safe, initialize dirbuf 1584 */ 1585 bzero(dirbuf.d_name, sizeof(dirbuf.d_name)); 1586 1587 /* 1588 * If the user buffer is smaller than the size of one dos directory 1589 * entry or the file offset is not a multiple of the size of a 1590 * directory entry, then we fail the read. 1591 */ 1592 off = offset = uio->uio_offset; 1593 if (uio->uio_resid < sizeof(struct direntry) || 1594 (offset & (sizeof(struct direntry) - 1))) 1595 return (EINVAL); 1596 1597 if (ap->a_ncookies) { 1598 ncookies = uio->uio_resid / 16; 1599 cookies = malloc(ncookies * sizeof(u_long), M_TEMP, 1600 M_WAITOK); 1601 *ap->a_cookies = cookies; 1602 *ap->a_ncookies = ncookies; 1603 } 1604 1605 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 1606 1607 /* 1608 * If they are reading from the root directory then, we simulate 1609 * the . and .. entries since these don't exist in the root 1610 * directory. We also set the offset bias to make up for having to 1611 * simulate these entries. By this I mean that at file offset 64 we 1612 * read the first entry in the root directory that lives on disk. 1613 */ 1614 if (dep->de_StartCluster == MSDOSFSROOT 1615 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) { 1616 #if 0 1617 printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n", 1618 offset); 1619 #endif 1620 bias = 2 * sizeof(struct direntry); 1621 if (offset < bias) { 1622 for (n = (int)offset / sizeof(struct direntry); 1623 n < 2; n++) { 1624 if (FAT32(pmp)) 1625 fileno = (uint64_t)cntobn(pmp, 1626 pmp->pm_rootdirblk) 1627 * dirsperblk; 1628 else 1629 fileno = 1; 1630 if (pmp->pm_flags & MSDOSFS_LARGEFS) { 1631 dirbuf.d_fileno = 1632 msdosfs_fileno_map(pmp->pm_mountp, 1633 fileno); 1634 } else { 1635 1636 dirbuf.d_fileno = (uint32_t)fileno; 1637 } 1638 dirbuf.d_type = DT_DIR; 1639 switch (n) { 1640 case 0: 1641 dirbuf.d_namlen = 1; 1642 strcpy(dirbuf.d_name, "."); 1643 break; 1644 case 1: 1645 dirbuf.d_namlen = 2; 1646 strcpy(dirbuf.d_name, ".."); 1647 break; 1648 } 1649 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1650 if (uio->uio_resid < dirbuf.d_reclen) 1651 goto out; 1652 error = uiomove(&dirbuf, dirbuf.d_reclen, uio); 1653 if (error) 1654 goto out; 1655 offset += sizeof(struct direntry); 1656 off = offset; 1657 if (cookies) { 1658 *cookies++ = offset; 1659 if (--ncookies <= 0) 1660 goto out; 1661 } 1662 } 1663 } 1664 } 1665 1666 mbnambuf_init(&nb); 1667 off = offset; 1668 while (uio->uio_resid > 0) { 1669 lbn = de_cluster(pmp, offset - bias); 1670 on = (offset - bias) & pmp->pm_crbomask; 1671 n = min(pmp->pm_bpcluster - on, uio->uio_resid); 1672 diff = dep->de_FileSize - (offset - bias); 1673 if (diff <= 0) 1674 break; 1675 n = min(n, diff); 1676 error = pcbmap(dep, lbn, &bn, &cn, &blsize); 1677 if (error) 1678 break; 1679 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp); 1680 if (error) { 1681 brelse(bp); 1682 return (error); 1683 } 1684 n = min(n, blsize - bp->b_resid); 1685 if (n == 0) { 1686 brelse(bp); 1687 return (EIO); 1688 } 1689 1690 /* 1691 * Convert from dos directory entries to fs-independent 1692 * directory entries. 1693 */ 1694 for (dentp = (struct direntry *)(bp->b_data + on); 1695 (char *)dentp < bp->b_data + on + n; 1696 dentp++, offset += sizeof(struct direntry)) { 1697 #if 0 1698 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n", 1699 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes); 1700 #endif 1701 /* 1702 * If this is an unused entry, we can stop. 1703 */ 1704 if (dentp->deName[0] == SLOT_EMPTY) { 1705 brelse(bp); 1706 goto out; 1707 } 1708 /* 1709 * Skip deleted entries. 1710 */ 1711 if (dentp->deName[0] == SLOT_DELETED) { 1712 chksum = -1; 1713 mbnambuf_init(&nb); 1714 continue; 1715 } 1716 1717 /* 1718 * Handle Win95 long directory entries 1719 */ 1720 if (dentp->deAttributes == ATTR_WIN95) { 1721 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) 1722 continue; 1723 chksum = win2unixfn(&nb, 1724 (struct winentry *)dentp, chksum, pmp); 1725 continue; 1726 } 1727 1728 /* 1729 * Skip volume labels 1730 */ 1731 if (dentp->deAttributes & ATTR_VOLUME) { 1732 chksum = -1; 1733 mbnambuf_init(&nb); 1734 continue; 1735 } 1736 /* 1737 * This computation of d_fileno must match 1738 * the computation of va_fileid in 1739 * msdosfs_getattr. 1740 */ 1741 if (dentp->deAttributes & ATTR_DIRECTORY) { 1742 fileno = getushort(dentp->deStartCluster); 1743 if (FAT32(pmp)) 1744 fileno |= getushort(dentp->deHighClust) << 16; 1745 /* if this is the root directory */ 1746 if (fileno == MSDOSFSROOT) 1747 if (FAT32(pmp)) 1748 fileno = (uint64_t)cntobn(pmp, 1749 pmp->pm_rootdirblk) 1750 * dirsperblk; 1751 else 1752 fileno = 1; 1753 else 1754 fileno = (uint64_t)cntobn(pmp, fileno) * 1755 dirsperblk; 1756 dirbuf.d_type = DT_DIR; 1757 } else { 1758 fileno = (uoff_t)offset / 1759 sizeof(struct direntry); 1760 dirbuf.d_type = DT_REG; 1761 } 1762 if (pmp->pm_flags & MSDOSFS_LARGEFS) { 1763 dirbuf.d_fileno = 1764 msdosfs_fileno_map(pmp->pm_mountp, fileno); 1765 } else 1766 dirbuf.d_fileno = (uint32_t)fileno; 1767 1768 if (chksum != winChksum(dentp->deName)) { 1769 dirbuf.d_namlen = dos2unixfn(dentp->deName, 1770 (u_char *)dirbuf.d_name, 1771 dentp->deLowerCase | 1772 ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ? 1773 (LCASE_BASE | LCASE_EXT) : 0), 1774 pmp); 1775 mbnambuf_init(&nb); 1776 } else 1777 mbnambuf_flush(&nb, &dirbuf); 1778 chksum = -1; 1779 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1780 if (uio->uio_resid < dirbuf.d_reclen) { 1781 brelse(bp); 1782 goto out; 1783 } 1784 error = uiomove(&dirbuf, dirbuf.d_reclen, uio); 1785 if (error) { 1786 brelse(bp); 1787 goto out; 1788 } 1789 if (cookies) { 1790 *cookies++ = offset + sizeof(struct direntry); 1791 if (--ncookies <= 0) { 1792 brelse(bp); 1793 goto out; 1794 } 1795 } 1796 off = offset + sizeof(struct direntry); 1797 } 1798 brelse(bp); 1799 } 1800 out: 1801 /* Subtract unused cookies */ 1802 if (ap->a_ncookies) 1803 *ap->a_ncookies -= ncookies; 1804 1805 uio->uio_offset = off; 1806 1807 /* 1808 * Set the eofflag (NFS uses it) 1809 */ 1810 if (ap->a_eofflag) { 1811 if (dep->de_FileSize - (offset - bias) <= 0) 1812 *ap->a_eofflag = 1; 1813 else 1814 *ap->a_eofflag = 0; 1815 } 1816 return (error); 1817 } 1818 1819 /*- 1820 * a_vp - pointer to the file's vnode 1821 * a_bn - logical block number within the file (cluster number for us) 1822 * a_bop - where to return the bufobj of the special file containing the fs 1823 * a_bnp - where to return the "physical" block number corresponding to a_bn 1824 * (relative to the special file; units are blocks of size DEV_BSIZE) 1825 * a_runp - where to return the "run past" a_bn. This is the count of logical 1826 * blocks whose physical blocks (together with a_bn's physical block) 1827 * are contiguous. 1828 * a_runb - where to return the "run before" a_bn. 1829 */ 1830 static int 1831 msdosfs_bmap(ap) 1832 struct vop_bmap_args /* { 1833 struct vnode *a_vp; 1834 daddr_t a_bn; 1835 struct bufobj **a_bop; 1836 daddr_t *a_bnp; 1837 int *a_runp; 1838 int *a_runb; 1839 } */ *ap; 1840 { 1841 struct denode *dep; 1842 struct mount *mp; 1843 struct msdosfsmount *pmp; 1844 struct vnode *vp; 1845 daddr_t runbn; 1846 u_long cn; 1847 int bnpercn, error, maxio, maxrun, run; 1848 1849 vp = ap->a_vp; 1850 dep = VTODE(vp); 1851 pmp = dep->de_pmp; 1852 if (ap->a_bop != NULL) 1853 *ap->a_bop = &pmp->pm_devvp->v_bufobj; 1854 if (ap->a_bnp == NULL) 1855 return (0); 1856 if (ap->a_runp != NULL) 1857 *ap->a_runp = 0; 1858 if (ap->a_runb != NULL) 1859 *ap->a_runb = 0; 1860 cn = ap->a_bn; 1861 if (cn != ap->a_bn) 1862 return (EFBIG); 1863 error = pcbmap(dep, cn, ap->a_bnp, NULL, NULL); 1864 if (error != 0 || (ap->a_runp == NULL && ap->a_runb == NULL)) 1865 return (error); 1866 1867 mp = vp->v_mount; 1868 maxio = mp->mnt_iosize_max / mp->mnt_stat.f_iosize; 1869 bnpercn = de_cn2bn(pmp, 1); 1870 if (ap->a_runp != NULL) { 1871 maxrun = ulmin(maxio - 1, pmp->pm_maxcluster - cn); 1872 for (run = 1; run <= maxrun; run++) { 1873 if (pcbmap(dep, cn + run, &runbn, NULL, NULL) != 0 || 1874 runbn != *ap->a_bnp + run * bnpercn) 1875 break; 1876 } 1877 *ap->a_runp = run - 1; 1878 } 1879 if (ap->a_runb != NULL) { 1880 maxrun = ulmin(maxio - 1, 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_runb = run - 1; 1887 } 1888 return (0); 1889 } 1890 1891 static int 1892 msdosfs_strategy(ap) 1893 struct vop_strategy_args /* { 1894 struct vnode *a_vp; 1895 struct buf *a_bp; 1896 } */ *ap; 1897 { 1898 struct buf *bp = ap->a_bp; 1899 struct denode *dep = VTODE(ap->a_vp); 1900 struct bufobj *bo; 1901 int error = 0; 1902 daddr_t blkno; 1903 1904 /* 1905 * If we don't already know the filesystem relative block number 1906 * then get it using pcbmap(). If pcbmap() returns the block 1907 * number as -1 then we've got a hole in the file. DOS filesystems 1908 * don't allow files with holes, so we shouldn't ever see this. 1909 */ 1910 if (bp->b_blkno == bp->b_lblkno) { 1911 error = pcbmap(dep, bp->b_lblkno, &blkno, 0, 0); 1912 bp->b_blkno = blkno; 1913 if (error) { 1914 bp->b_error = error; 1915 bp->b_ioflags |= BIO_ERROR; 1916 bufdone(bp); 1917 return (0); 1918 } 1919 if ((long)bp->b_blkno == -1) 1920 vfs_bio_clrbuf(bp); 1921 } 1922 if (bp->b_blkno == -1) { 1923 bufdone(bp); 1924 return (0); 1925 } 1926 /* 1927 * Read/write the block from/to the disk that contains the desired 1928 * file block. 1929 */ 1930 bp->b_iooffset = dbtob(bp->b_blkno); 1931 bo = dep->de_pmp->pm_bo; 1932 BO_STRATEGY(bo, bp); 1933 return (0); 1934 } 1935 1936 static int 1937 msdosfs_print(ap) 1938 struct vop_print_args /* { 1939 struct vnode *vp; 1940 } */ *ap; 1941 { 1942 struct denode *dep = VTODE(ap->a_vp); 1943 1944 printf("\tstartcluster %lu, dircluster %lu, diroffset %lu, ", 1945 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset); 1946 printf("on dev %s\n", devtoname(dep->de_pmp->pm_dev)); 1947 return (0); 1948 } 1949 1950 static int 1951 msdosfs_pathconf(ap) 1952 struct vop_pathconf_args /* { 1953 struct vnode *a_vp; 1954 int a_name; 1955 int *a_retval; 1956 } */ *ap; 1957 { 1958 struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp; 1959 1960 switch (ap->a_name) { 1961 case _PC_LINK_MAX: 1962 *ap->a_retval = 1; 1963 return (0); 1964 case _PC_NAME_MAX: 1965 *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12; 1966 return (0); 1967 case _PC_PATH_MAX: 1968 *ap->a_retval = PATH_MAX; 1969 return (0); 1970 case _PC_CHOWN_RESTRICTED: 1971 *ap->a_retval = 1; 1972 return (0); 1973 case _PC_NO_TRUNC: 1974 *ap->a_retval = 0; 1975 return (0); 1976 default: 1977 return (EINVAL); 1978 } 1979 /* NOTREACHED */ 1980 } 1981 1982 static int 1983 msdosfs_vptofh(ap) 1984 struct vop_vptofh_args /* { 1985 struct vnode *a_vp; 1986 struct fid *a_fhp; 1987 } */ *ap; 1988 { 1989 struct denode *dep; 1990 struct defid *defhp; 1991 1992 dep = VTODE(ap->a_vp); 1993 defhp = (struct defid *)ap->a_fhp; 1994 defhp->defid_len = sizeof(struct defid); 1995 defhp->defid_dirclust = dep->de_dirclust; 1996 defhp->defid_dirofs = dep->de_diroffset; 1997 /* defhp->defid_gen = dep->de_gen; */ 1998 return (0); 1999 } 2000 2001 /* Global vfs data structures for msdosfs */ 2002 struct vop_vector msdosfs_vnodeops = { 2003 .vop_default = &default_vnodeops, 2004 2005 .vop_access = msdosfs_access, 2006 .vop_bmap = msdosfs_bmap, 2007 .vop_cachedlookup = msdosfs_lookup, 2008 .vop_open = msdosfs_open, 2009 .vop_close = msdosfs_close, 2010 .vop_create = msdosfs_create, 2011 .vop_fsync = msdosfs_fsync, 2012 .vop_getattr = msdosfs_getattr, 2013 .vop_inactive = msdosfs_inactive, 2014 .vop_link = msdosfs_link, 2015 .vop_lookup = vfs_cache_lookup, 2016 .vop_mkdir = msdosfs_mkdir, 2017 .vop_mknod = msdosfs_mknod, 2018 .vop_pathconf = msdosfs_pathconf, 2019 .vop_print = msdosfs_print, 2020 .vop_read = msdosfs_read, 2021 .vop_readdir = msdosfs_readdir, 2022 .vop_reclaim = msdosfs_reclaim, 2023 .vop_remove = msdosfs_remove, 2024 .vop_rename = msdosfs_rename, 2025 .vop_rmdir = msdosfs_rmdir, 2026 .vop_setattr = msdosfs_setattr, 2027 .vop_strategy = msdosfs_strategy, 2028 .vop_symlink = msdosfs_symlink, 2029 .vop_write = msdosfs_write, 2030 .vop_vptofh = msdosfs_vptofh, 2031 };
Cache object: fd003d54cf6f9cdad56e45fd550f0604
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