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/namei.h> 54#include <sys/resourcevar.h> /* defines plimit structure in proc struct */ 55#include <sys/kernel.h> 56#include <sys/stat.h> 57#include <sys/buf.h> 58#include <sys/proc.h> 59#include <sys/mount.h> 60#include <sys/unistd.h> 61#include <sys/vnode.h> 62#include <miscfs/specfs/specdev.h> /* XXX */ /* defines v_rdev */ 63#include <sys/malloc.h> 64#include <sys/dirent.h> 65#include <sys/signalvar.h> 66 67#include <vm/vm.h> 68#include <vm/vm_extern.h> 69#include <vm/vm_zone.h> 70#include <vm/vnode_pager.h> 71 72#include <msdosfs/bpb.h> 73#include <msdosfs/direntry.h> 74#include <msdosfs/denode.h> 75#include <msdosfs/msdosfsmount.h> 76#include <msdosfs/fat.h> 77 78/* 79 * Prototypes for MSDOSFS vnode operations 80 */ 81static int msdosfs_create __P((struct vop_create_args *)); 82static int msdosfs_mknod __P((struct vop_mknod_args *)); 83static int msdosfs_close __P((struct vop_close_args *)); 84static int msdosfs_access __P((struct vop_access_args *)); 85static int msdosfs_getattr __P((struct vop_getattr_args *)); 86static int msdosfs_setattr __P((struct vop_setattr_args *)); 87static int msdosfs_read __P((struct vop_read_args *)); 88static int msdosfs_write __P((struct vop_write_args *)); 89static int msdosfs_fsync __P((struct vop_fsync_args *)); 90static int msdosfs_remove __P((struct vop_remove_args *)); 91static int msdosfs_link __P((struct vop_link_args *)); 92static int msdosfs_rename __P((struct vop_rename_args *)); 93static int msdosfs_mkdir __P((struct vop_mkdir_args *)); 94static int msdosfs_rmdir __P((struct vop_rmdir_args *)); 95static int msdosfs_symlink __P((struct vop_symlink_args *)); 96static int msdosfs_readdir __P((struct vop_readdir_args *)); 97static int msdosfs_abortop __P((struct vop_abortop_args *)); 98static int msdosfs_bmap __P((struct vop_bmap_args *)); 99static int msdosfs_strategy __P((struct vop_strategy_args *)); 100static int msdosfs_print __P((struct vop_print_args *)); 101static int msdosfs_pathconf __P((struct vop_pathconf_args *ap)); 102static int msdosfs_getpages __P((struct vop_getpages_args *)); 103static int msdosfs_putpages __P((struct vop_putpages_args *)); 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 */ 129static int 130msdosfs_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_dev = pdep->de_dev; 181 ndirent.de_devvp = pdep->de_devvp; 182 ndirent.de_pmp = pdep->de_pmp; 183 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 184 getnanotime(&ts); 185 DETIMES(&ndirent, &ts, &ts, &ts); 186 error = createde(&ndirent, pdep, &dep, cnp); 187 if (error) 188 goto bad; 189 if ((cnp->cn_flags & SAVESTART) == 0) 190 zfree(namei_zone, cnp->cn_pnbuf); 191 *ap->a_vpp = DETOV(dep); 192 return (0); 193 194bad: 195 zfree(namei_zone, cnp->cn_pnbuf); 196 return (error); 197} 198 199static int 200msdosfs_mknod(ap) 201 struct vop_mknod_args /* { 202 struct vnode *a_dvp; 203 struct vnode **a_vpp; 204 struct componentname *a_cnp; 205 struct vattr *a_vap; 206 } */ *ap; 207{ 208 209 switch (ap->a_vap->va_type) { 210 case VDIR: 211 return (msdosfs_mkdir((struct vop_mkdir_args *)ap)); 212 break; 213 214 case VREG: 215 return (msdosfs_create((struct vop_create_args *)ap)); 216 break; 217 218 default: 219 zfree(namei_zone, ap->a_cnp->cn_pnbuf); 220 return (EINVAL); 221 } 222 /* NOTREACHED */ 223} 224 225static int 226msdosfs_close(ap) 227 struct vop_close_args /* { 228 struct vnode *a_vp; 229 int a_fflag; 230 struct ucred *a_cred; 231 struct proc *a_p; 232 } */ *ap; 233{ 234 struct vnode *vp = ap->a_vp; 235 struct denode *dep = VTODE(vp); 236 struct timespec ts; 237 238 simple_lock(&vp->v_interlock); 239 if (vp->v_usecount > 1) { 240 getnanotime(&ts); 241 DETIMES(dep, &ts, &ts, &ts); 242 } 243 simple_unlock(&vp->v_interlock); 244 return 0; 245} 246 247static int 248msdosfs_access(ap) 249 struct vop_access_args /* { 250 struct vnode *a_vp; 251 int a_mode; 252 struct ucred *a_cred; 253 struct proc *a_p; 254 } */ *ap; 255{ 256 struct vnode *vp = ap->a_vp; 257 struct denode *dep = VTODE(ap->a_vp); 258 struct msdosfsmount *pmp = dep->de_pmp; 259 struct ucred *cred = ap->a_cred; 260 mode_t mask, file_mode, mode = ap->a_mode; 261 register gid_t *gp; 262 int i; 263 264 file_mode = (S_IXUSR|S_IXGRP|S_IXOTH) | (S_IRUSR|S_IRGRP|S_IROTH) | 265 ((dep->de_Attributes & ATTR_READONLY) ? 0 : (S_IWUSR|S_IWGRP|S_IWOTH)); 266 file_mode &= pmp->pm_mask; 267 268 /* 269 * Disallow write attempts on read-only file systems; 270 * unless the file is a socket, fifo, or a block or 271 * character device resident on the file system. 272 */ 273 if (mode & VWRITE) { 274 switch (vp->v_type) { 275 case VDIR: 276 case VLNK: 277 case VREG: 278 if (vp->v_mount->mnt_flag & MNT_RDONLY) 279 return (EROFS); 280 break; 281 default: 282 break; 283 } 284 } 285 286 /* User id 0 always gets access. */ 287 if (cred->cr_uid == 0) 288 return 0; 289 290 mask = 0; 291 292 /* Otherwise, check the owner. */ 293 if (cred->cr_uid == pmp->pm_uid) { 294 if (mode & VEXEC) 295 mask |= S_IXUSR; 296 if (mode & VREAD) 297 mask |= S_IRUSR; 298 if (mode & VWRITE) 299 mask |= S_IWUSR; 300 return (file_mode & mask) == mask ? 0 : EACCES; 301 } 302 303 /* Otherwise, check the groups. */ 304 for (i = 0, gp = cred->cr_groups; i < cred->cr_ngroups; i++, gp++) 305 if (pmp->pm_gid == *gp) { 306 if (mode & VEXEC) 307 mask |= S_IXGRP; 308 if (mode & VREAD) 309 mask |= S_IRGRP; 310 if (mode & VWRITE) 311 mask |= S_IWGRP; 312 return (file_mode & mask) == mask ? 0 : EACCES; 313 } 314 315 /* Otherwise, check everyone else. */ 316 if (mode & VEXEC) 317 mask |= S_IXOTH; 318 if (mode & VREAD) 319 mask |= S_IROTH; 320 if (mode & VWRITE) 321 mask |= S_IWOTH; 322 return (file_mode & mask) == mask ? 0 : EACCES; 323} 324 325static int 326msdosfs_getattr(ap) 327 struct vop_getattr_args /* { 328 struct vnode *a_vp; 329 struct vattr *a_vap; 330 struct ucred *a_cred; 331 struct proc *a_p; 332 } */ *ap; 333{ 334 struct denode *dep = VTODE(ap->a_vp); 335 struct msdosfsmount *pmp = dep->de_pmp; 336 struct vattr *vap = ap->a_vap; 337 mode_t mode; 338 struct timespec ts; 339 u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 340 u_long fileid; 341 342 getnanotime(&ts); 343 DETIMES(dep, &ts, &ts, &ts); 344 vap->va_fsid = dep->de_dev; 345 /* 346 * The following computation of the fileid must be the same as that 347 * used in msdosfs_readdir() to compute d_fileno. If not, pwd 348 * doesn't work. 349 */ 350 if (dep->de_Attributes & ATTR_DIRECTORY) { 351 fileid = cntobn(pmp, dep->de_StartCluster) * dirsperblk; 352 if (dep->de_StartCluster == MSDOSFSROOT) 353 fileid = 1; 354 } else { 355 fileid = cntobn(pmp, dep->de_dirclust) * dirsperblk; 356 if (dep->de_dirclust == MSDOSFSROOT) 357 fileid = roottobn(pmp, 0) * dirsperblk; 358 fileid += dep->de_diroffset / sizeof(struct direntry); 359 } 360 vap->va_fileid = fileid; 361 if ((dep->de_Attributes & ATTR_READONLY) == 0) 362 mode = S_IRWXU|S_IRWXG|S_IRWXO; 363 else 364 mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 365 vap->va_mode = mode & pmp->pm_mask; 366 vap->va_uid = pmp->pm_uid; 367 vap->va_gid = pmp->pm_gid; 368 vap->va_nlink = 1; 369 vap->va_rdev = 0; 370 vap->va_size = dep->de_FileSize; 371 dos2unixtime(dep->de_MDate, dep->de_MTime, 0, &vap->va_mtime); 372 if (pmp->pm_flags & MSDOSFSMNT_LONGNAME) { 373 dos2unixtime(dep->de_ADate, 0, 0, &vap->va_atime); 374 dos2unixtime(dep->de_CDate, dep->de_CTime, dep->de_CHun, &vap->va_ctime); 375 } else { 376 vap->va_atime = vap->va_mtime; 377 vap->va_ctime = vap->va_mtime; 378 } 379 vap->va_flags = 0; 380 if ((dep->de_Attributes & ATTR_ARCHIVE) == 0) 381 vap->va_flags |= SF_ARCHIVED; 382 vap->va_gen = 0; 383 vap->va_blocksize = pmp->pm_bpcluster; 384 vap->va_bytes = 385 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask; 386 vap->va_type = ap->a_vp->v_type; 387 vap->va_filerev = dep->de_modrev; 388 return (0); 389} 390 391static int 392msdosfs_setattr(ap) 393 struct vop_setattr_args /* { 394 struct vnode *a_vp; 395 struct vattr *a_vap; 396 struct ucred *a_cred; 397 struct proc *a_p; 398 } */ *ap; 399{ 400 struct vnode *vp = ap->a_vp; 401 struct denode *dep = VTODE(ap->a_vp); 402 struct msdosfsmount *pmp = dep->de_pmp; 403 struct vattr *vap = ap->a_vap; 404 struct ucred *cred = ap->a_cred; 405 int error = 0; 406 407#ifdef MSDOSFS_DEBUG 408 printf("msdosfs_setattr(): vp %p, vap %p, cred %p, p %p\n", 409 ap->a_vp, vap, cred, ap->a_p); 410#endif 411 412 /* 413 * Check for unsettable attributes. 414 */ 415 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 416 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 417 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 418 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 419#ifdef MSDOSFS_DEBUG 420 printf("msdosfs_setattr(): returning EINVAL\n"); 421 printf(" va_type %d, va_nlink %x, va_fsid %lx, va_fileid %lx\n", 422 vap->va_type, vap->va_nlink, vap->va_fsid, vap->va_fileid); 423 printf(" va_blocksize %lx, va_rdev %x, va_bytes %qx, va_gen %lx\n", 424 vap->va_blocksize, vap->va_rdev, vap->va_bytes, vap->va_gen); 425 printf(" va_uid %x, va_gid %x\n", 426 vap->va_uid, vap->va_gid); 427#endif 428 return (EINVAL); 429 } 430 if (vap->va_flags != VNOVAL) { 431 if (vp->v_mount->mnt_flag & MNT_RDONLY) 432 return (EROFS); 433 if (cred->cr_uid != pmp->pm_uid && 434 (error = suser_xxx(cred, ap->a_p, PRISON_ROOT))) 435 return (error); 436 /* 437 * We are very inconsistent about handling unsupported 438 * attributes. We ignored the access time and the 439 * read and execute bits. We were strict for the other 440 * attributes. 441 * 442 * Here we are strict, stricter than ufs in not allowing 443 * users to attempt to set SF_SETTABLE bits or anyone to 444 * set unsupported bits. However, we ignore attempts to 445 * set ATTR_ARCHIVE for directories `cp -pr' from a more 446 * sensible file system attempts it a lot. 447 */ 448 if (cred->cr_uid != 0) { 449 if (vap->va_flags & SF_SETTABLE) 450 return EPERM; 451 } 452 if (vap->va_flags & ~SF_ARCHIVED) 453 return EOPNOTSUPP; 454 if (vap->va_flags & SF_ARCHIVED) 455 dep->de_Attributes &= ~ATTR_ARCHIVE; 456 else if (!(dep->de_Attributes & ATTR_DIRECTORY)) 457 dep->de_Attributes |= ATTR_ARCHIVE; 458 dep->de_flag |= DE_MODIFIED; 459 } 460 461 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 462 uid_t uid; 463 gid_t gid; 464 465 if (vp->v_mount->mnt_flag & MNT_RDONLY) 466 return (EROFS); 467 uid = vap->va_uid; 468 if (uid == (uid_t)VNOVAL) 469 uid = pmp->pm_uid; 470 gid = vap->va_gid; 471 if (gid == (gid_t)VNOVAL) 472 gid = pmp->pm_gid; 473 if ((cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid || 474 (gid != pmp->pm_gid && !groupmember(gid, cred))) && 475 (error = suser_xxx(cred, ap->a_p, PRISON_ROOT))) 476 return error; 477 if (uid != pmp->pm_uid || gid != pmp->pm_gid) 478 return EINVAL; 479 } 480 481 if (vap->va_size != VNOVAL) { 482 /* 483 * Disallow write attempts on read-only file systems; 484 * unless the file is a socket, fifo, or a block or 485 * character device resident on the file system. 486 */ 487 switch (vp->v_type) { 488 case VDIR: 489 return (EISDIR); 490 /* NOT REACHED */ 491 case VLNK: 492 case VREG: 493 if (vp->v_mount->mnt_flag & MNT_RDONLY) 494 return (EROFS); 495 break; 496 default: 497 break; 498 } 499 error = detrunc(dep, vap->va_size, 0, cred, ap->a_p); 500 if (error) 501 return error; 502 } 503 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 504 if (vp->v_mount->mnt_flag & MNT_RDONLY) 505 return (EROFS); 506 if (cred->cr_uid != pmp->pm_uid && 507 (error = suser_xxx(cred, ap->a_p, PRISON_ROOT)) && 508 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 509 (error = VOP_ACCESS(ap->a_vp, VWRITE, cred, ap->a_p)))) 510 return (error); 511 if (vp->v_type != VDIR) { 512 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 && 513 vap->va_atime.tv_sec != VNOVAL) 514 unix2dostime(&vap->va_atime, &dep->de_ADate, NULL, NULL); 515 if (vap->va_mtime.tv_sec != VNOVAL) 516 unix2dostime(&vap->va_mtime, &dep->de_MDate, &dep->de_MTime, NULL); 517 dep->de_Attributes |= ATTR_ARCHIVE; 518 dep->de_flag |= DE_MODIFIED; 519 } 520 } 521 /* 522 * DOS files only have the ability to have their writability 523 * attribute set, so we use the owner write bit to set the readonly 524 * attribute. 525 */ 526 if (vap->va_mode != (mode_t)VNOVAL) { 527 if (vp->v_mount->mnt_flag & MNT_RDONLY) 528 return (EROFS); 529 if (cred->cr_uid != pmp->pm_uid && 530 (error = suser_xxx(cred, ap->a_p, PRISON_ROOT))) 531 return (error); 532 if (vp->v_type != VDIR) { 533 /* We ignore the read and execute bits. */ 534 if (vap->va_mode & VWRITE) 535 dep->de_Attributes &= ~ATTR_READONLY; 536 else 537 dep->de_Attributes |= ATTR_READONLY; 538 dep->de_flag |= DE_MODIFIED; 539 } 540 } 541 return (deupdat(dep, 1)); 542} 543 544static int 545msdosfs_read(ap) 546 struct vop_read_args /* { 547 struct vnode *a_vp; 548 struct uio *a_uio; 549 int a_ioflag; 550 struct ucred *a_cred; 551 } */ *ap; 552{ 553 int error = 0; 554 int diff; 555 int blsize; 556 int isadir; 557 long n; 558 long on; 559 daddr_t lbn; 560 daddr_t rablock; 561 int rasize; 562 struct buf *bp; 563 struct vnode *vp = ap->a_vp; 564 struct denode *dep = VTODE(vp); 565 struct msdosfsmount *pmp = dep->de_pmp; 566 struct uio *uio = ap->a_uio; 567 568 /* 569 * If they didn't ask for any data, then we are done. 570 */ 571 if (uio->uio_resid == 0) 572 return (0); 573 if (uio->uio_offset < 0) 574 return (EINVAL); 575 576 isadir = dep->de_Attributes & ATTR_DIRECTORY; 577 do { 578 lbn = de_cluster(pmp, uio->uio_offset); 579 on = uio->uio_offset & pmp->pm_crbomask; 580 n = min((u_long) (pmp->pm_bpcluster - on), uio->uio_resid); 581 diff = dep->de_FileSize - uio->uio_offset; 582 if (diff <= 0) 583 return (0); 584 if (diff < n) 585 n = diff; 586 /* convert cluster # to block # if a directory */ 587 if (isadir) { 588 error = pcbmap(dep, lbn, &lbn, 0, &blsize); 589 if (error) 590 return (error); 591 } 592 /* 593 * If we are operating on a directory file then be sure to 594 * do i/o with the vnode for the filesystem instead of the 595 * vnode for the directory. 596 */ 597 if (isadir) { 598 error = bread(pmp->pm_devvp, lbn, blsize, NOCRED, &bp); 599 } else { 600 rablock = lbn + 1; 601 if (vp->v_lastr + 1 == lbn && 602 de_cn2off(pmp, rablock) < dep->de_FileSize) { 603 rasize = pmp->pm_bpcluster; 604 error = breadn(vp, lbn, pmp->pm_bpcluster, 605 &rablock, &rasize, 1, NOCRED, &bp); 606 } else 607 error = bread(vp, lbn, pmp->pm_bpcluster, 608 NOCRED, &bp); 609 vp->v_lastr = lbn; 610 } 611 n = min(n, pmp->pm_bpcluster - bp->b_resid); 612 if (error) { 613 brelse(bp); 614 return (error); 615 } 616 error = uiomove(bp->b_data + on, (int) n, uio); 617 brelse(bp); 618 } while (error == 0 && uio->uio_resid > 0 && n != 0); 619 if (!isadir && !(vp->v_mount->mnt_flag & MNT_NOATIME)) 620 dep->de_flag |= DE_ACCESS; 621 return (error); 622} 623 624/* 625 * Write data to a file or directory. 626 */ 627static int 628msdosfs_write(ap) 629 struct vop_write_args /* { 630 struct vnode *a_vp; 631 struct uio *a_uio; 632 int a_ioflag; 633 struct ucred *a_cred; 634 } */ *ap; 635{ 636 int n; 637 int croffset; 638 int resid; 639 u_long osize; 640 int error = 0; 641 u_long count; 642 daddr_t bn, lastcn; 643 struct buf *bp; 644 int ioflag = ap->a_ioflag; 645 struct uio *uio = ap->a_uio; 646 struct proc *p = uio->uio_procp; 647 struct vnode *vp = ap->a_vp; 648 struct vnode *thisvp; 649 struct denode *dep = VTODE(vp); 650 struct msdosfsmount *pmp = dep->de_pmp; 651 struct ucred *cred = ap->a_cred; 652 653#ifdef MSDOSFS_DEBUG 654 printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n", 655 vp, uio, ioflag, cred); 656 printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n", 657 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster); 658#endif 659 660 switch (vp->v_type) { 661 case VREG: 662 if (ioflag & IO_APPEND) 663 uio->uio_offset = dep->de_FileSize; 664 thisvp = vp; 665 break; 666 case VDIR: 667 return EISDIR; 668 default: 669 panic("msdosfs_write(): bad file type"); 670 } 671 672 if (uio->uio_offset < 0) 673 return (EINVAL); 674 675 if (uio->uio_resid == 0) 676 return (0); 677 678 /* 679 * If they've exceeded their filesize limit, tell them about it. 680 */ 681 if (p && 682 ((uio->uio_offset + uio->uio_resid) > 683 p->p_rlimit[RLIMIT_FSIZE].rlim_cur)) { 684 psignal(p, SIGXFSZ); 685 return (EFBIG); 686 } 687 688 /* 689 * If the offset we are starting the write at is beyond the end of 690 * the file, then they've done a seek. Unix filesystems allow 691 * files with holes in them, DOS doesn't so we must fill the hole 692 * with zeroed blocks. 693 */ 694 if (uio->uio_offset > dep->de_FileSize) { 695 error = deextend(dep, uio->uio_offset, cred); 696 if (error) 697 return (error); 698 } 699 700 /* 701 * Remember some values in case the write fails. 702 */ 703 resid = uio->uio_resid; 704 osize = dep->de_FileSize; 705 706 /* 707 * If we write beyond the end of the file, extend it to its ultimate 708 * size ahead of the time to hopefully get a contiguous area. 709 */ 710 if (uio->uio_offset + resid > osize) { 711 count = de_clcount(pmp, uio->uio_offset + resid) - 712 de_clcount(pmp, osize); 713 error = extendfile(dep, count, NULL, NULL, 0); 714 if (error && (error != ENOSPC || (ioflag & IO_UNIT))) 715 goto errexit; 716 lastcn = dep->de_fc[FC_LASTFC].fc_frcn; 717 } else 718 lastcn = de_clcount(pmp, osize) - 1; 719 720 do { 721 if (de_cluster(pmp, uio->uio_offset) > lastcn) { 722 error = ENOSPC; 723 break; 724 } 725 726 croffset = uio->uio_offset & pmp->pm_crbomask; 727 n = min(uio->uio_resid, pmp->pm_bpcluster - croffset); 728 if (uio->uio_offset + n > dep->de_FileSize) { 729 dep->de_FileSize = uio->uio_offset + n; 730 /* The object size needs to be set before buffer is allocated */ 731 vnode_pager_setsize(vp, dep->de_FileSize); 732 } 733 734 bn = de_cluster(pmp, uio->uio_offset); 735 if ((uio->uio_offset & pmp->pm_crbomask) == 0 736 && (de_cluster(pmp, uio->uio_offset + uio->uio_resid) 737 > de_cluster(pmp, uio->uio_offset) 738 || uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) { 739 /* 740 * If either the whole cluster gets written, 741 * or we write the cluster from its start beyond EOF, 742 * then no need to read data from disk. 743 */ 744 bp = getblk(thisvp, bn, pmp->pm_bpcluster, 0, 0); 745 clrbuf(bp); 746 /* 747 * Do the bmap now, since pcbmap needs buffers 748 * for the fat table. (see msdosfs_strategy) 749 */ 750 if (bp->b_blkno == bp->b_lblkno) { 751 error = pcbmap(dep, bp->b_lblkno, &bp->b_blkno, 752 0, 0); 753 if (error) 754 bp->b_blkno = -1; 755 } 756 if (bp->b_blkno == -1) { 757 brelse(bp); 758 if (!error) 759 error = EIO; /* XXX */ 760 break; 761 } 762 } else { 763 /* 764 * The block we need to write into exists, so read it in. 765 */ 766 error = bread(thisvp, bn, pmp->pm_bpcluster, cred, &bp); 767 if (error) { 768 brelse(bp); 769 break; 770 } 771 } 772 773 /* 774 * Should these vnode_pager_* functions be done on dir 775 * files? 776 */ 777 778 /* 779 * Copy the data from user space into the buf header. 780 */ 781 error = uiomove(bp->b_data + croffset, n, uio); 782 783 /* 784 * If they want this synchronous then write it and wait for 785 * it. Otherwise, if on a cluster boundary write it 786 * asynchronously so we can move on to the next block 787 * without delay. Otherwise do a delayed write because we 788 * may want to write somemore into the block later. 789 */ 790 if (ioflag & IO_SYNC) 791 (void) bwrite(bp); 792 else if (n + croffset == pmp->pm_bpcluster) 793 bawrite(bp); 794 else 795 bdwrite(bp); 796 dep->de_flag |= DE_UPDATE; 797 } while (error == 0 && uio->uio_resid > 0); 798 799 /* 800 * If the write failed and they want us to, truncate the file back 801 * to the size it was before the write was attempted. 802 */ 803errexit: 804 if (error) { 805 if (ioflag & IO_UNIT) { 806 detrunc(dep, osize, ioflag & IO_SYNC, NOCRED, NULL); 807 uio->uio_offset -= resid - uio->uio_resid; 808 uio->uio_resid = resid; 809 } else { 810 detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC, NOCRED, NULL); 811 if (uio->uio_resid != resid) 812 error = 0; 813 } 814 } else if (ioflag & IO_SYNC) 815 error = deupdat(dep, 1); 816 return (error); 817} 818 819/* 820 * Flush the blocks of a file to disk. 821 * 822 * This function is worthless for vnodes that represent directories. Maybe we 823 * could just do a sync if they try an fsync on a directory file. 824 */ 825static int 826msdosfs_fsync(ap) 827 struct vop_fsync_args /* { 828 struct vnode *a_vp; 829 struct ucred *a_cred; 830 int a_waitfor; 831 struct proc *a_p; 832 } */ *ap; 833{ 834 struct vnode *vp = ap->a_vp; 835 int s; 836 struct buf *bp, *nbp; 837 838 /* 839 * Flush all dirty buffers associated with a vnode. 840 */ 841loop: 842 s = splbio(); 843 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { 844 nbp = TAILQ_NEXT(bp, b_vnbufs); 845 if ((bp->b_flags & B_BUSY)) 846 continue; 847 if ((bp->b_flags & B_DELWRI) == 0) 848 panic("msdosfs_fsync: not dirty"); 849 bremfree(bp); 850 bp->b_flags |= B_BUSY; 851 splx(s); 852 (void) bwrite(bp); 853 goto loop; 854 } 855 while (vp->v_numoutput) { 856 vp->v_flag |= VBWAIT; 857 (void) tsleep((caddr_t)&vp->v_numoutput, PRIBIO + 1, "msdosfsn", 0); 858 } 859#ifdef DIAGNOSTIC 860 if (!TAILQ_EMPTY(&vp->v_dirtyblkhd)) { 861 vprint("msdosfs_fsync: dirty", vp); 862 goto loop; 863 } 864#endif 865 splx(s); 866 return (deupdat(VTODE(vp), ap->a_waitfor == MNT_WAIT)); 867} 868 869static int 870msdosfs_remove(ap) 871 struct vop_remove_args /* { 872 struct vnode *a_dvp; 873 struct vnode *a_vp; 874 struct componentname *a_cnp; 875 } */ *ap; 876{ 877 struct denode *dep = VTODE(ap->a_vp); 878 struct denode *ddep = VTODE(ap->a_dvp); 879 int error; 880 881 if (ap->a_vp->v_type == VDIR) 882 error = EPERM; 883 else 884 error = removede(ddep, dep); 885#ifdef MSDOSFS_DEBUG 886 printf("msdosfs_remove(), dep %p, v_usecount %d\n", dep, ap->a_vp->v_usecount); 887#endif 888 return (error); 889} 890 891/* 892 * DOS filesystems don't know what links are. But since we already called 893 * msdosfs_lookup() with create and lockparent, the parent is locked so we 894 * have to free it before we return the error. 895 */ 896static int 897msdosfs_link(ap) 898 struct vop_link_args /* { 899 struct vnode *a_tdvp; 900 struct vnode *a_vp; 901 struct componentname *a_cnp; 902 } */ *ap; 903{ 904 VOP_ABORTOP(ap->a_tdvp, ap->a_cnp); 905 return (EOPNOTSUPP); 906} 907 908/* 909 * Renames on files require moving the denode to a new hash queue since the 910 * denode's location is used to compute which hash queue to put the file 911 * in. Unless it is a rename in place. For example "mv a b". 912 * 913 * What follows is the basic algorithm: 914 * 915 * if (file move) { 916 * if (dest file exists) { 917 * remove dest file 918 * } 919 * if (dest and src in same directory) { 920 * rewrite name in existing directory slot 921 * } else { 922 * write new entry in dest directory 923 * update offset and dirclust in denode 924 * move denode to new hash chain 925 * clear old directory entry 926 * } 927 * } else { 928 * directory move 929 * if (dest directory exists) { 930 * if (dest is not empty) { 931 * return ENOTEMPTY 932 * } 933 * remove dest directory 934 * } 935 * if (dest and src in same directory) { 936 * rewrite name in existing entry 937 * } else { 938 * be sure dest is not a child of src directory 939 * write entry in dest directory 940 * update "." and ".." in moved directory 941 * clear old directory entry for moved directory 942 * } 943 * } 944 * 945 * On entry: 946 * source's parent directory is unlocked 947 * source file or directory is unlocked 948 * destination's parent directory is locked 949 * destination file or directory is locked if it exists 950 * 951 * On exit: 952 * all denodes should be released 953 * 954 * Notes: 955 * I'm not sure how the memory containing the pathnames pointed at by the 956 * componentname structures is freed, there may be some memory bleeding 957 * for each rename done. 958 */ 959static int 960msdosfs_rename(ap) 961 struct vop_rename_args /* { 962 struct vnode *a_fdvp; 963 struct vnode *a_fvp; 964 struct componentname *a_fcnp; 965 struct vnode *a_tdvp; 966 struct vnode *a_tvp; 967 struct componentname *a_tcnp; 968 } */ *ap; 969{ 970 struct vnode *tdvp = ap->a_tdvp; 971 struct vnode *fvp = ap->a_fvp; 972 struct vnode *fdvp = ap->a_fdvp; 973 struct vnode *tvp = ap->a_tvp; 974 struct componentname *tcnp = ap->a_tcnp; 975 struct componentname *fcnp = ap->a_fcnp; 976 struct proc *p = fcnp->cn_proc; 977 struct denode *ip, *xp, *dp, *zp; 978 u_char toname[11], oldname[11]; 979 u_long from_diroffset, to_diroffset; 980 u_char to_count; 981 int doingdirectory = 0, newparent = 0; 982 int error; 983 u_long cn; 984 daddr_t bn; 985 struct denode *fddep; /* from file's parent directory */ 986 struct denode *fdep; /* from file or directory */ 987 struct denode *tddep; /* to file's parent directory */ 988 struct denode *tdep; /* to file or directory */ 989 struct msdosfsmount *pmp; 990 struct direntry *dotdotp; 991 struct buf *bp; 992 993 fddep = VTODE(ap->a_fdvp); 994 fdep = VTODE(ap->a_fvp); 995 tddep = VTODE(ap->a_tdvp); 996 tdep = tvp ? VTODE(tvp) : NULL; 997 pmp = fddep->de_pmp; 998 999 pmp = VFSTOMSDOSFS(fdvp->v_mount); 1000 1001#ifdef DIAGNOSTIC 1002 if ((tcnp->cn_flags & HASBUF) == 0 || 1003 (fcnp->cn_flags & HASBUF) == 0) 1004 panic("msdosfs_rename: no name"); 1005#endif 1006 /* 1007 * Check for cross-device rename. 1008 */ 1009 if ((fvp->v_mount != tdvp->v_mount) || 1010 (tvp && (fvp->v_mount != tvp->v_mount))) { 1011 error = EXDEV; 1012abortit: 1013 VOP_ABORTOP(tdvp, tcnp); 1014 if (tdvp == tvp) 1015 vrele(tdvp); 1016 else 1017 vput(tdvp); 1018 if (tvp) 1019 vput(tvp); 1020 VOP_ABORTOP(fdvp, fcnp); 1021 vrele(fdvp); 1022 vrele(fvp); 1023 return (error); 1024 } 1025 1026 /* 1027 * If source and dest are the same, do nothing. 1028 */ 1029 if (tvp == fvp) { 1030 error = 0; 1031 goto abortit; 1032 } 1033 1034 error = vn_lock(fvp, LK_EXCLUSIVE, p); 1035 if (error) 1036 goto abortit; 1037 dp = VTODE(fdvp); 1038 ip = VTODE(fvp); 1039 1040 /* 1041 * Be sure we are not renaming ".", "..", or an alias of ".". This 1042 * leads to a crippled directory tree. It's pretty tough to do a 1043 * "ls" or "pwd" with the "." directory entry missing, and "cd .." 1044 * doesn't work if the ".." entry is missing. 1045 */ 1046 if (ip->de_Attributes & ATTR_DIRECTORY) { 1047 /* 1048 * Avoid ".", "..", and aliases of "." for obvious reasons. 1049 */ 1050 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 1051 dp == ip || 1052 (fcnp->cn_flags & ISDOTDOT) || 1053 (tcnp->cn_flags & ISDOTDOT) || 1054 (ip->de_flag & DE_RENAME)) { 1055 VOP_UNLOCK(fvp, 0, p); 1056 error = EINVAL; 1057 goto abortit; 1058 } 1059 ip->de_flag |= DE_RENAME; 1060 doingdirectory++; 1061 } 1062 1063 /* 1064 * When the target exists, both the directory 1065 * and target vnodes are returned locked. 1066 */ 1067 dp = VTODE(tdvp); 1068 xp = tvp ? VTODE(tvp) : NULL; 1069 /* 1070 * Remember direntry place to use for destination 1071 */ 1072 to_diroffset = dp->de_fndoffset; 1073 to_count = dp->de_fndcnt; 1074 1075 /* 1076 * If ".." must be changed (ie the directory gets a new 1077 * parent) then the source directory must not be in the 1078 * directory heirarchy above the target, as this would 1079 * orphan everything below the source directory. Also 1080 * the user must have write permission in the source so 1081 * as to be able to change "..". We must repeat the call 1082 * to namei, as the parent directory is unlocked by the 1083 * call to doscheckpath(). 1084 */ 1085 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_proc); 1086 VOP_UNLOCK(fvp, 0, p); 1087 if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster) 1088 newparent = 1; 1089 vrele(fdvp); 1090 if (doingdirectory && newparent) { 1091 if (error) /* write access check above */ 1092 goto bad; 1093 if (xp != NULL) 1094 vput(tvp); 1095 /* 1096 * doscheckpath() vput()'s dp, 1097 * so we have to do a relookup afterwards 1098 */ 1099 error = doscheckpath(ip, dp); 1100 if (error) 1101 goto out; 1102 if ((tcnp->cn_flags & SAVESTART) == 0) 1103 panic("msdosfs_rename: lost to startdir"); 1104 error = relookup(tdvp, &tvp, tcnp); 1105 if (error) 1106 goto out; 1107 dp = VTODE(tdvp); 1108 xp = tvp ? VTODE(tvp) : NULL; 1109 } 1110 1111 if (xp != NULL) { 1112 /* 1113 * Target must be empty if a directory and have no links 1114 * to it. Also, ensure source and target are compatible 1115 * (both directories, or both not directories). 1116 */ 1117 if (xp->de_Attributes & ATTR_DIRECTORY) { 1118 if (!dosdirempty(xp)) { 1119 error = ENOTEMPTY; 1120 goto bad; 1121 } 1122 if (!doingdirectory) { 1123 error = ENOTDIR; 1124 goto bad; 1125 } 1126 cache_purge(tdvp); 1127 } else if (doingdirectory) { 1128 error = EISDIR; 1129 goto bad; 1130 } 1131 error = removede(dp, xp); 1132 if (error) 1133 goto bad; 1134 vput(tvp); 1135 xp = NULL; 1136 } 1137 1138 /* 1139 * Convert the filename in tcnp into a dos filename. We copy this 1140 * into the denode and directory entry for the destination 1141 * file/directory. 1142 */ 1143 error = uniqdosname(VTODE(tdvp), tcnp, toname); 1144 if (error) 1145 goto abortit; 1146 1147 /* 1148 * Since from wasn't locked at various places above, 1149 * have to do a relookup here. 1150 */ 1151 fcnp->cn_flags &= ~MODMASK; 1152 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 1153 if ((fcnp->cn_flags & SAVESTART) == 0) 1154 panic("msdosfs_rename: lost from startdir"); 1155 if (!newparent) 1156 VOP_UNLOCK(tdvp, 0, p); 1157 (void) relookup(fdvp, &fvp, fcnp); 1158 if (fvp == NULL) { 1159 /* 1160 * From name has disappeared. 1161 */ 1162 if (doingdirectory) 1163 panic("rename: lost dir entry"); 1164 vrele(ap->a_fvp); 1165 if (newparent) 1166 VOP_UNLOCK(tdvp, 0, p); 1167 vrele(tdvp); 1168 return 0; 1169 } 1170 xp = VTODE(fvp); 1171 zp = VTODE(fdvp); 1172 from_diroffset = zp->de_fndoffset; 1173 1174 /* 1175 * Ensure that the directory entry still exists and has not 1176 * changed till now. If the source is a file the entry may 1177 * have been unlinked or renamed. In either case there is 1178 * no further work to be done. If the source is a directory 1179 * then it cannot have been rmdir'ed or renamed; this is 1180 * prohibited by the DE_RENAME flag. 1181 */ 1182 if (xp != ip) { 1183 if (doingdirectory) 1184 panic("rename: lost dir entry"); 1185 vrele(ap->a_fvp); 1186 VOP_UNLOCK(fvp, 0, p); 1187 if (newparent) 1188 VOP_UNLOCK(fdvp, 0, p); 1189 xp = NULL; 1190 } else { 1191 vrele(fvp); 1192 xp = NULL; 1193 1194 /* 1195 * First write a new entry in the destination 1196 * directory and mark the entry in the source directory 1197 * as deleted. Then move the denode to the correct hash 1198 * chain for its new location in the filesystem. And, if 1199 * we moved a directory, then update its .. entry to point 1200 * to the new parent directory. 1201 */ 1202 bcopy(ip->de_Name, oldname, 11); 1203 bcopy(toname, ip->de_Name, 11); /* update denode */ 1204 dp->de_fndoffset = to_diroffset; 1205 dp->de_fndcnt = to_count; 1206 error = createde(ip, dp, (struct denode **)0, tcnp); 1207 if (error) { 1208 bcopy(oldname, ip->de_Name, 11); 1209 if (newparent) 1210 VOP_UNLOCK(fdvp, 0, p); 1211 VOP_UNLOCK(fvp, 0, p); 1212 goto bad; 1213 } 1214 ip->de_refcnt++; 1215 zp->de_fndoffset = from_diroffset; 1216 error = removede(zp, ip); 1217 if (error) { 1218 /* XXX should really panic here, fs is corrupt */ 1219 if (newparent) 1220 VOP_UNLOCK(fdvp, 0, p); 1221 VOP_UNLOCK(fvp, 0, p); 1222 goto bad; 1223 } 1224 if (!doingdirectory) { 1225 error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0, 1226 &ip->de_dirclust, 0); 1227 if (error) { 1228 /* XXX should really panic here, fs is corrupt */ 1229 if (newparent) 1230 VOP_UNLOCK(fdvp, 0, p); 1231 VOP_UNLOCK(fvp, 0, p); 1232 goto bad; 1233 } 1234 if (ip->de_dirclust == MSDOSFSROOT) 1235 ip->de_diroffset = to_diroffset; 1236 else 1237 ip->de_diroffset = to_diroffset & pmp->pm_crbomask; 1238 } 1239 reinsert(ip); 1240 if (newparent) 1241 VOP_UNLOCK(fdvp, 0, p); 1242 } 1243 1244 /* 1245 * If we moved a directory to a new parent directory, then we must 1246 * fixup the ".." entry in the moved directory. 1247 */ 1248 if (doingdirectory && newparent) { 1249 cn = ip->de_StartCluster; 1250 if (cn == MSDOSFSROOT) { 1251 /* this should never happen */ 1252 panic("msdosfs_rename(): updating .. in root directory?"); 1253 } else 1254 bn = cntobn(pmp, cn); 1255 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, 1256 NOCRED, &bp); 1257 if (error) { 1258 /* XXX should really panic here, fs is corrupt */ 1259 brelse(bp); 1260 VOP_UNLOCK(fvp, 0, p); 1261 goto bad; 1262 } 1263 dotdotp = (struct direntry *)bp->b_data + 1; 1264 putushort(dotdotp->deStartCluster, dp->de_StartCluster); 1265 if (FAT32(pmp)) 1266 putushort(dotdotp->deHighClust, dp->de_StartCluster >> 16); 1267 error = bwrite(bp); 1268 if (error) { 1269 /* XXX should really panic here, fs is corrupt */ 1270 VOP_UNLOCK(fvp, 0, p); 1271 goto bad; 1272 } 1273 } 1274 1275 VOP_UNLOCK(fvp, 0, p); 1276bad: 1277 if (xp) 1278 vput(tvp); 1279 vput(tdvp); 1280out: 1281 ip->de_flag &= ~DE_RENAME; 1282 vrele(fdvp); 1283 vrele(fvp); 1284 return (error); 1285 1286} 1287 1288static struct { 1289 struct direntry dot; 1290 struct direntry dotdot; 1291} dosdirtemplate = { 1292 { ". ", " ", /* the . entry */ 1293 ATTR_DIRECTORY, /* file attribute */ 1294 0, /* reserved */ 1295 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1296 { 0, 0 }, /* access date */ 1297 { 0, 0 }, /* high bits of start cluster */ 1298 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1299 { 0, 0 }, /* startcluster */ 1300 { 0, 0, 0, 0 } /* filesize */ 1301 }, 1302 { ".. ", " ", /* the .. entry */ 1303 ATTR_DIRECTORY, /* file attribute */ 1304 0, /* reserved */ 1305 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1306 { 0, 0 }, /* access date */ 1307 { 0, 0 }, /* high bits of start cluster */ 1308 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1309 { 0, 0 }, /* startcluster */ 1310 { 0, 0, 0, 0 } /* filesize */ 1311 } 1312}; 1313 1314static int 1315msdosfs_mkdir(ap) 1316 struct vop_mkdir_args /* { 1317 struct vnode *a_dvp; 1318 struvt vnode **a_vpp; 1319 struvt componentname *a_cnp; 1320 struct vattr *a_vap; 1321 } */ *ap; 1322{ 1323 struct componentname *cnp = ap->a_cnp; 1324 struct denode *dep; 1325 struct denode *pdep = VTODE(ap->a_dvp); 1326 struct direntry *denp; 1327 struct msdosfsmount *pmp = pdep->de_pmp; 1328 struct buf *bp; 1329 u_long newcluster, pcl; 1330 int bn; 1331 int error; 1332 struct denode ndirent; 1333 struct timespec ts; 1334 1335 /* 1336 * If this is the root directory and there is no space left we 1337 * can't do anything. This is because the root directory can not 1338 * change size. 1339 */ 1340 if (pdep->de_StartCluster == MSDOSFSROOT 1341 && pdep->de_fndoffset >= pdep->de_FileSize) { 1342 error = ENOSPC; 1343 goto bad2; 1344 } 1345 1346 /* 1347 * Allocate a cluster to hold the about to be created directory. 1348 */ 1349 error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL); 1350 if (error) 1351 goto bad2; 1352 1353 bzero(&ndirent, sizeof(ndirent)); 1354 ndirent.de_pmp = pmp; 1355 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 1356 getnanotime(&ts); 1357 DETIMES(&ndirent, &ts, &ts, &ts); 1358 1359 /* 1360 * Now fill the cluster with the "." and ".." entries. And write 1361 * the cluster to disk. This way it is there for the parent 1362 * directory to be pointing at if there were a crash. 1363 */ 1364 bn = cntobn(pmp, newcluster); 1365 /* always succeeds */ 1366 bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0); 1367 bzero(bp->b_data, pmp->pm_bpcluster); 1368 bcopy(&dosdirtemplate, bp->b_data, sizeof dosdirtemplate); 1369 denp = (struct direntry *)bp->b_data; 1370 putushort(denp[0].deStartCluster, newcluster); 1371 putushort(denp[0].deCDate, ndirent.de_CDate); 1372 putushort(denp[0].deCTime, ndirent.de_CTime); 1373 denp[0].deCHundredth = ndirent.de_CHun; 1374 putushort(denp[0].deADate, ndirent.de_ADate); 1375 putushort(denp[0].deMDate, ndirent.de_MDate); 1376 putushort(denp[0].deMTime, ndirent.de_MTime); 1377 pcl = pdep->de_StartCluster; 1378 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1379 pcl = 0; 1380 putushort(denp[1].deStartCluster, pcl); 1381 putushort(denp[1].deCDate, ndirent.de_CDate); 1382 putushort(denp[1].deCTime, ndirent.de_CTime); 1383 denp[1].deCHundredth = ndirent.de_CHun; 1384 putushort(denp[1].deADate, ndirent.de_ADate); 1385 putushort(denp[1].deMDate, ndirent.de_MDate); 1386 putushort(denp[1].deMTime, ndirent.de_MTime); 1387 if (FAT32(pmp)) { 1388 putushort(denp[0].deHighClust, newcluster >> 16); 1389 putushort(denp[1].deHighClust, pdep->de_StartCluster >> 16); 1390 } 1391 1392 error = bwrite(bp); 1393 if (error) 1394 goto bad; 1395 1396 /* 1397 * Now build up a directory entry pointing to the newly allocated 1398 * cluster. This will be written to an empty slot in the parent 1399 * directory. 1400 */ 1401#ifdef DIAGNOSTIC 1402 if ((cnp->cn_flags & HASBUF) == 0) 1403 panic("msdosfs_mkdir: no name"); 1404#endif 1405 error = uniqdosname(pdep, cnp, ndirent.de_Name); 1406 if (error) 1407 goto bad; 1408 1409 ndirent.de_Attributes = ATTR_DIRECTORY; 1410 ndirent.de_LowerCase = 0; 1411 ndirent.de_StartCluster = newcluster; 1412 ndirent.de_FileSize = 0; 1413 ndirent.de_dev = pdep->de_dev; 1414 ndirent.de_devvp = pdep->de_devvp; 1415 error = createde(&ndirent, pdep, &dep, cnp); 1416 if (error) 1417 goto bad; 1418 if ((cnp->cn_flags & SAVESTART) == 0) 1419 zfree(namei_zone, cnp->cn_pnbuf); 1420 *ap->a_vpp = DETOV(dep); 1421 return (0); 1422 1423bad: 1424 clusterfree(pmp, newcluster, NULL); 1425bad2: 1426 zfree(namei_zone, cnp->cn_pnbuf); 1427 return (error); 1428} 1429 1430static int 1431msdosfs_rmdir(ap) 1432 struct vop_rmdir_args /* { 1433 struct vnode *a_dvp; 1434 struct vnode *a_vp; 1435 struct componentname *a_cnp; 1436 } */ *ap; 1437{ 1438 register struct vnode *vp = ap->a_vp; 1439 register struct vnode *dvp = ap->a_dvp; 1440 register struct componentname *cnp = ap->a_cnp; 1441 register struct denode *ip, *dp; 1442 struct proc *p = cnp->cn_proc; 1443 int error; 1444 1445 ip = VTODE(vp); 1446 dp = VTODE(dvp); 1447 1448 /* 1449 * Verify the directory is empty (and valid). 1450 * (Rmdir ".." won't be valid since 1451 * ".." will contain a reference to 1452 * the current directory and thus be 1453 * non-empty.) 1454 */ 1455 error = 0; 1456 if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) { 1457 error = ENOTEMPTY; 1458 goto out; 1459 } 1460 /* 1461 * Delete the entry from the directory. For dos filesystems this 1462 * gets rid of the directory entry on disk, the in memory copy 1463 * still exists but the de_refcnt is <= 0. This prevents it from 1464 * being found by deget(). When the vput() on dep is done we give 1465 * up access and eventually msdosfs_reclaim() will be called which 1466 * will remove it from the denode cache. 1467 */ 1468 error = removede(dp, ip); 1469 if (error) 1470 goto out; 1471 /* 1472 * This is where we decrement the link count in the parent 1473 * directory. Since dos filesystems don't do this we just purge 1474 * the name cache. 1475 */ 1476 cache_purge(dvp); 1477 VOP_UNLOCK(dvp, 0, p); 1478 /* 1479 * Truncate the directory that is being deleted. 1480 */ 1481 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred, p); 1482 cache_purge(vp); 1483 1484 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, p); 1485out: 1486 return (error); 1487} 1488 1489/* 1490 * DOS filesystems don't know what symlinks are. 1491 */ 1492static int 1493msdosfs_symlink(ap) 1494 struct vop_symlink_args /* { 1495 struct vnode *a_dvp; 1496 struct vnode **a_vpp; 1497 struct componentname *a_cnp; 1498 struct vattr *a_vap; 1499 char *a_target; 1500 } */ *ap; 1501{ 1502 zfree(namei_zone, ap->a_cnp->cn_pnbuf); 1503 /* VOP_ABORTOP(ap->a_dvp, ap->a_cnp); ??? */ 1504 return (EOPNOTSUPP); 1505} 1506 1507static int 1508msdosfs_readdir(ap) 1509 struct vop_readdir_args /* { 1510 struct vnode *a_vp; 1511 struct uio *a_uio; 1512 struct ucred *a_cred; 1513 int *a_eofflag; 1514 int *a_ncookies; 1515 u_long **a_cookies; 1516 } */ *ap; 1517{ 1518 int error = 0; 1519 int diff; 1520 long n; 1521 int blsize; 1522 long on; 1523 u_long cn; 1524 u_long fileno; 1525 u_long dirsperblk; 1526 long bias = 0; 1527 daddr_t bn, lbn; 1528 struct buf *bp; 1529 struct denode *dep = VTODE(ap->a_vp); 1530 struct msdosfsmount *pmp = dep->de_pmp; 1531 struct direntry *dentp; 1532 struct dirent dirbuf; 1533 struct uio *uio = ap->a_uio; 1534 u_long *cookies = NULL; 1535 int ncookies = 0; 1536 off_t offset, off; 1537 int chksum = -1; 1538 1539#ifdef MSDOSFS_DEBUG 1540 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n", 1541 ap->a_vp, uio, ap->a_cred, ap->a_eofflag); 1542#endif 1543 1544 /* 1545 * msdosfs_readdir() won't operate properly on regular files since 1546 * it does i/o only with the the filesystem vnode, and hence can 1547 * retrieve the wrong block from the buffer cache for a plain file. 1548 * So, fail attempts to readdir() on a plain file. 1549 */ 1550 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) 1551 return (ENOTDIR); 1552 1553 /* 1554 * To be safe, initialize dirbuf 1555 */ 1556 bzero(dirbuf.d_name, sizeof(dirbuf.d_name)); 1557 1558 /* 1559 * If the user buffer is smaller than the size of one dos directory 1560 * entry or the file offset is not a multiple of the size of a 1561 * directory entry, then we fail the read. 1562 */ 1563 off = offset = uio->uio_offset; 1564 if (uio->uio_resid < sizeof(struct direntry) || 1565 (offset & (sizeof(struct direntry) - 1))) 1566 return (EINVAL); 1567 1568 if (ap->a_ncookies) { 1569 ncookies = uio->uio_resid / 16; 1570 MALLOC(cookies, u_long *, ncookies * sizeof(u_long), M_TEMP, 1571 M_WAITOK); 1572 *ap->a_cookies = cookies; 1573 *ap->a_ncookies = ncookies; 1574 } 1575 1576 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 1577 1578 /* 1579 * If they are reading from the root directory then, we simulate 1580 * the . and .. entries since these don't exist in the root 1581 * directory. We also set the offset bias to make up for having to 1582 * simulate these entries. By this I mean that at file offset 64 we 1583 * read the first entry in the root directory that lives on disk. 1584 */ 1585 if (dep->de_StartCluster == MSDOSFSROOT 1586 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) { 1587#if 0 1588 printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n", 1589 offset); 1590#endif 1591 bias = 2 * sizeof(struct direntry); 1592 if (offset < bias) { 1593 for (n = (int)offset / sizeof(struct direntry); 1594 n < 2; n++) { 1595 if (FAT32(pmp)) 1596 dirbuf.d_fileno = cntobn(pmp, 1597 pmp->pm_rootdirblk) 1598 * dirsperblk; 1599 else 1600 dirbuf.d_fileno = 1; 1601 dirbuf.d_type = DT_DIR; 1602 switch (n) { 1603 case 0: 1604 dirbuf.d_namlen = 1; 1605 strcpy(dirbuf.d_name, "."); 1606 break; 1607 case 1: 1608 dirbuf.d_namlen = 2; 1609 strcpy(dirbuf.d_name, ".."); 1610 break; 1611 } 1612 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1613 if (uio->uio_resid < dirbuf.d_reclen) 1614 goto out; 1615 error = uiomove((caddr_t) &dirbuf, 1616 dirbuf.d_reclen, uio); 1617 if (error) 1618 goto out; 1619 offset += sizeof(struct direntry); 1620 off = offset; 1621 if (cookies) { 1622 *cookies++ = offset; 1623 if (--ncookies <= 0) 1624 goto out; 1625 } 1626 } 1627 } 1628 } 1629 1630 off = offset; 1631 while (uio->uio_resid > 0) { 1632 lbn = de_cluster(pmp, offset - bias); 1633 on = (offset - bias) & pmp->pm_crbomask; 1634 n = min(pmp->pm_bpcluster - on, uio->uio_resid); 1635 diff = dep->de_FileSize - (offset - bias); 1636 if (diff <= 0) 1637 break; 1638 n = min(n, diff); 1639 error = pcbmap(dep, lbn, &bn, &cn, &blsize); 1640 if (error) 1641 break; 1642 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp); 1643 if (error) { 1644 brelse(bp); 1645 return (error); 1646 } 1647 n = min(n, blsize - bp->b_resid); 1648 1649 /* 1650 * Convert from dos directory entries to fs-independent 1651 * directory entries. 1652 */ 1653 for (dentp = (struct direntry *)(bp->b_data + on); 1654 (char *)dentp < bp->b_data + on + n; 1655 dentp++, offset += sizeof(struct direntry)) { 1656#if 0 1657 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n", 1658 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes); 1659#endif 1660 /* 1661 * If this is an unused entry, we can stop. 1662 */ 1663 if (dentp->deName[0] == SLOT_EMPTY) { 1664 brelse(bp); 1665 goto out; 1666 } 1667 /* 1668 * Skip deleted entries. 1669 */ 1670 if (dentp->deName[0] == SLOT_DELETED) { 1671 chksum = -1; 1672 continue; 1673 } 1674 1675 /* 1676 * Handle Win95 long directory entries 1677 */ 1678 if (dentp->deAttributes == ATTR_WIN95) { 1679 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) 1680 continue; 1681 chksum = win2unixfn((struct winentry *)dentp, 1682 &dirbuf, chksum, 1683 pmp->pm_flags & MSDOSFSMNT_U2WTABLE, 1684 pmp->pm_u2w); 1685 continue; 1686 } 1687 1688 /* 1689 * Skip volume labels 1690 */ 1691 if (dentp->deAttributes & ATTR_VOLUME) { 1692 chksum = -1; 1693 continue; 1694 } 1695 /* 1696 * This computation of d_fileno must match 1697 * the computation of va_fileid in 1698 * msdosfs_getattr. 1699 */ 1700 if (dentp->deAttributes & ATTR_DIRECTORY) { 1701 fileno = getushort(dentp->deStartCluster); 1702 if (FAT32(pmp)) 1703 fileno |= getushort(dentp->deHighClust) << 16; 1704 /* if this is the root directory */ 1705 if (fileno == MSDOSFSROOT) 1706 if (FAT32(pmp)) 1707 fileno = cntobn(pmp, 1708 pmp->pm_rootdirblk) 1709 * dirsperblk; 1710 else 1711 fileno = 1; 1712 else 1713 fileno = cntobn(pmp, fileno) * dirsperblk; 1714 dirbuf.d_fileno = fileno; 1715 dirbuf.d_type = DT_DIR; 1716 } else { 1717 dirbuf.d_fileno = offset / sizeof(struct direntry); 1718 dirbuf.d_type = DT_REG; 1719 } 1720 if (chksum != winChksum(dentp->deName)) 1721 dirbuf.d_namlen = dos2unixfn(dentp->deName, 1722 (u_char *)dirbuf.d_name, 1723 dentp->deLowerCase | 1724 ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ? 1725 (LCASE_BASE | LCASE_EXT) : 0), 1726 pmp->pm_flags & MSDOSFSMNT_U2WTABLE, 1727 pmp->pm_d2u, 1728 pmp->pm_flags & MSDOSFSMNT_ULTABLE, 1729 pmp->pm_ul); 1730 else 1731 dirbuf.d_name[dirbuf.d_namlen] = 0; 1732 chksum = -1; 1733 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1734 if (uio->uio_resid < dirbuf.d_reclen) { 1735 brelse(bp); 1736 goto out; 1737 } 1738 error = uiomove((caddr_t) &dirbuf, 1739 dirbuf.d_reclen, uio); 1740 if (error) { 1741 brelse(bp); 1742 goto out; 1743 } 1744 if (cookies) { 1745 *cookies++ = offset + sizeof(struct direntry); 1746 if (--ncookies <= 0) { 1747 brelse(bp); 1748 goto out; 1749 } 1750 } 1751 off = offset + sizeof(struct direntry); 1752 } 1753 brelse(bp); 1754 } 1755out: 1756 /* Subtract unused cookies */ 1757 if (ap->a_ncookies) 1758 *ap->a_ncookies -= ncookies; 1759 1760 uio->uio_offset = off; 1761 1762 /* 1763 * Set the eofflag (NFS uses it) 1764 */
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