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/lockf.h> 54 #include <sys/namei.h> 55 #include <sys/resourcevar.h> /* defines plimit structure in proc struct */ 56 #include <sys/kernel.h> 57 #include <sys/stat.h> 58 #include <sys/bio.h> 59 #include <sys/conf.h> 60 #include <sys/clock.h> 61 #include <sys/buf.h> 62 #include <sys/priv.h> 63 #include <sys/proc.h> 64 #include <sys/mount.h> 65 #include <sys/unistd.h> 66 #include <sys/vnode.h> 67 #include <sys/malloc.h> 68 #include <sys/dirent.h> 69 #include <sys/signalvar.h> 70 71 #include <vm/vm.h> 72 #include <vm/vm_extern.h> 73 #include <vm/vnode_pager.h> 74 75 #include <machine/mutex.h> 76 77 #include <fs/msdosfs/bpb.h> 78 #include <fs/msdosfs/msdosfsmount.h> 79 #include <fs/msdosfs/direntry.h> 80 #include <fs/msdosfs/denode.h> 81 #include <fs/msdosfs/fat.h> 82 83 #define DOS_FILESIZE_MAX 0xffffffff 84 85 /* 86 * Prototypes for MSDOSFS vnode operations 87 */ 88 static vop_advlock_t msdosfs_advlock; 89 static vop_create_t msdosfs_create; 90 static vop_mknod_t msdosfs_mknod; 91 static vop_open_t msdosfs_open; 92 static vop_close_t msdosfs_close; 93 static vop_access_t msdosfs_access; 94 static vop_getattr_t msdosfs_getattr; 95 static vop_setattr_t msdosfs_setattr; 96 static vop_read_t msdosfs_read; 97 static vop_write_t msdosfs_write; 98 static vop_fsync_t msdosfs_fsync; 99 static vop_remove_t msdosfs_remove; 100 static vop_link_t msdosfs_link; 101 static vop_rename_t msdosfs_rename; 102 static vop_mkdir_t msdosfs_mkdir; 103 static vop_rmdir_t msdosfs_rmdir; 104 static vop_symlink_t msdosfs_symlink; 105 static vop_readdir_t msdosfs_readdir; 106 static vop_bmap_t msdosfs_bmap; 107 static vop_strategy_t msdosfs_strategy; 108 static vop_print_t msdosfs_print; 109 static vop_pathconf_t msdosfs_pathconf; 110 static vop_vptofh_t msdosfs_vptofh; 111 112 /* 113 * Some general notes: 114 * 115 * In the ufs filesystem the inodes, superblocks, and indirect blocks are 116 * read/written using the vnode for the filesystem. Blocks that represent 117 * the contents of a file are read/written using the vnode for the file 118 * (including directories when they are read/written as files). This 119 * presents problems for the dos filesystem because data that should be in 120 * an inode (if dos had them) resides in the directory itself. Since we 121 * must update directory entries without the benefit of having the vnode 122 * for the directory we must use the vnode for the filesystem. This means 123 * that when a directory is actually read/written (via read, write, or 124 * readdir, or seek) we must use the vnode for the filesystem instead of 125 * the vnode for the directory as would happen in ufs. This is to insure we 126 * retreive the correct block from the buffer cache since the hash value is 127 * based upon the vnode address and the desired block number. 128 */ 129 130 /* 131 * Create a regular file. On entry the directory to contain the file being 132 * created is locked. We must release before we return. We must also free 133 * the pathname buffer pointed at by cnp->cn_pnbuf, always on error, or 134 * only if the SAVESTART bit in cn_flags is clear on success. 135 */ 136 static int 137 msdosfs_create(ap) 138 struct vop_create_args /* { 139 struct vnode *a_dvp; 140 struct vnode **a_vpp; 141 struct componentname *a_cnp; 142 struct vattr *a_vap; 143 } */ *ap; 144 { 145 struct componentname *cnp = ap->a_cnp; 146 struct denode ndirent; 147 struct denode *dep; 148 struct denode *pdep = VTODE(ap->a_dvp); 149 struct timespec ts; 150 int error; 151 152 #ifdef MSDOSFS_DEBUG 153 printf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap); 154 #endif 155 156 /* 157 * If this is the root directory and there is no space left we 158 * can't do anything. This is because the root directory can not 159 * change size. 160 */ 161 if (pdep->de_StartCluster == MSDOSFSROOT 162 && pdep->de_fndoffset >= pdep->de_FileSize) { 163 error = ENOSPC; 164 goto bad; 165 } 166 167 /* 168 * Create a directory entry for the file, then call createde() to 169 * have it installed. NOTE: DOS files are always executable. We 170 * use the absence of the owner write bit to make the file 171 * readonly. 172 */ 173 #ifdef DIAGNOSTIC 174 if ((cnp->cn_flags & HASBUF) == 0) 175 panic("msdosfs_create: no name"); 176 #endif 177 bzero(&ndirent, sizeof(ndirent)); 178 error = uniqdosname(pdep, cnp, ndirent.de_Name); 179 if (error) 180 goto bad; 181 182 ndirent.de_Attributes = (ap->a_vap->va_mode & VWRITE) ? 183 ATTR_ARCHIVE : ATTR_ARCHIVE | ATTR_READONLY; 184 ndirent.de_LowerCase = 0; 185 ndirent.de_StartCluster = 0; 186 ndirent.de_FileSize = 0; 187 ndirent.de_dev = pdep->de_dev; 188 ndirent.de_pmp = pdep->de_pmp; 189 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 190 getnanotime(&ts); 191 DETIMES(&ndirent, &ts, &ts, &ts); 192 error = createde(&ndirent, pdep, &dep, cnp); 193 if (error) 194 goto bad; 195 *ap->a_vpp = DETOV(dep); 196 return (0); 197 198 bad: 199 return (error); 200 } 201 202 static int 203 msdosfs_mknod(ap) 204 struct vop_mknod_args /* { 205 struct vnode *a_dvp; 206 struct vnode **a_vpp; 207 struct componentname *a_cnp; 208 struct vattr *a_vap; 209 } */ *ap; 210 { 211 return (EINVAL); 212 } 213 214 static int 215 msdosfs_open(ap) 216 struct vop_open_args /* { 217 struct vnode *a_vp; 218 int a_mode; 219 struct ucred *a_cred; 220 struct thread *a_td; 221 int a_fdidx; 222 } */ *ap; 223 { 224 struct denode *dep = VTODE(ap->a_vp); 225 vnode_create_vobject(ap->a_vp, dep->de_FileSize, ap->a_td); 226 return 0; 227 } 228 229 static int 230 msdosfs_close(ap) 231 struct vop_close_args /* { 232 struct vnode *a_vp; 233 int a_fflag; 234 struct ucred *a_cred; 235 struct thread *a_td; 236 } */ *ap; 237 { 238 struct vnode *vp = ap->a_vp; 239 struct denode *dep = VTODE(vp); 240 struct timespec ts; 241 242 VI_LOCK(vp); 243 if (vp->v_usecount > 1) { 244 getnanotime(&ts); 245 DETIMES(dep, &ts, &ts, &ts); 246 } 247 VI_UNLOCK(vp); 248 return 0; 249 } 250 251 static int 252 msdosfs_access(ap) 253 struct vop_access_args /* { 254 struct vnode *a_vp; 255 int a_mode; 256 struct ucred *a_cred; 257 struct thread *a_td; 258 } */ *ap; 259 { 260 struct vnode *vp = ap->a_vp; 261 struct denode *dep = VTODE(ap->a_vp); 262 struct msdosfsmount *pmp = dep->de_pmp; 263 mode_t file_mode, mode = ap->a_mode; 264 265 file_mode = (S_IXUSR|S_IXGRP|S_IXOTH) | (S_IRUSR|S_IRGRP|S_IROTH) | 266 ((dep->de_Attributes & ATTR_READONLY) ? 0 : (S_IWUSR|S_IWGRP|S_IWOTH)); 267 file_mode &= (vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); 268 269 /* 270 * Disallow write attempts on read-only filesystems; 271 * unless the file is a socket, fifo, or a block or 272 * character device resident on the filesystem. 273 */ 274 if (mode & VWRITE) { 275 switch (vp->v_type) { 276 case VDIR: 277 case VLNK: 278 case VREG: 279 if (vp->v_mount->mnt_flag & MNT_RDONLY) 280 return (EROFS); 281 break; 282 default: 283 break; 284 } 285 } 286 287 return (vaccess(vp->v_type, file_mode, pmp->pm_uid, pmp->pm_gid, 288 ap->a_mode, ap->a_cred, NULL)); 289 } 290 291 static int 292 msdosfs_getattr(ap) 293 struct vop_getattr_args /* { 294 struct vnode *a_vp; 295 struct vattr *a_vap; 296 struct ucred *a_cred; 297 struct thread *a_td; 298 } */ *ap; 299 { 300 struct denode *dep = VTODE(ap->a_vp); 301 struct msdosfsmount *pmp = dep->de_pmp; 302 struct vattr *vap = ap->a_vap; 303 mode_t mode; 304 struct timespec ts; 305 u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 306 uint64_t fileid; 307 308 getnanotime(&ts); 309 DETIMES(dep, &ts, &ts, &ts); 310 vap->va_fsid = dev2udev(dep->de_dev); 311 /* 312 * The following computation of the fileid must be the same as that 313 * used in msdosfs_readdir() to compute d_fileno. If not, pwd 314 * doesn't work. 315 */ 316 if (dep->de_Attributes & ATTR_DIRECTORY) { 317 fileid = (uint64_t)cntobn(pmp, dep->de_StartCluster) * 318 dirsperblk; 319 if (dep->de_StartCluster == MSDOSFSROOT) 320 fileid = 1; 321 } else { 322 fileid = (uint64_t)cntobn(pmp, dep->de_dirclust) * 323 dirsperblk; 324 if (dep->de_dirclust == MSDOSFSROOT) 325 fileid = (uint64_t)roottobn(pmp, 0) * dirsperblk; 326 fileid += (uint64_t)dep->de_diroffset / sizeof(struct direntry); 327 } 328 329 if (pmp->pm_flags & MSDOSFS_LARGEFS) 330 vap->va_fileid = msdosfs_fileno_map(pmp->pm_mountp, fileid); 331 else 332 vap->va_fileid = (long)fileid; 333 334 if ((dep->de_Attributes & ATTR_READONLY) == 0) 335 mode = S_IRWXU|S_IRWXG|S_IRWXO; 336 else 337 mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 338 vap->va_mode = mode & 339 (ap->a_vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); 340 vap->va_uid = pmp->pm_uid; 341 vap->va_gid = pmp->pm_gid; 342 vap->va_nlink = 1; 343 vap->va_rdev = 0; 344 vap->va_size = dep->de_FileSize; 345 fattime2timespec(dep->de_MDate, dep->de_MTime, 0, 0, &vap->va_mtime); 346 vap->va_ctime = vap->va_mtime; 347 if (pmp->pm_flags & MSDOSFSMNT_LONGNAME) { 348 fattime2timespec(dep->de_ADate, 0, 0, 0, &vap->va_atime); 349 fattime2timespec(dep->de_CDate, dep->de_CTime, dep->de_CHun, 350 0, &vap->va_birthtime); 351 } else { 352 vap->va_atime = vap->va_mtime; 353 vap->va_birthtime.tv_sec = -1; 354 vap->va_birthtime.tv_nsec = 0; 355 } 356 vap->va_flags = 0; 357 if ((dep->de_Attributes & ATTR_ARCHIVE) == 0) 358 vap->va_flags |= SF_ARCHIVED; 359 vap->va_gen = 0; 360 vap->va_blocksize = pmp->pm_bpcluster; 361 vap->va_bytes = 362 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask; 363 vap->va_type = ap->a_vp->v_type; 364 vap->va_filerev = dep->de_modrev; 365 return (0); 366 } 367 368 static int 369 msdosfs_setattr(ap) 370 struct vop_setattr_args /* { 371 struct vnode *a_vp; 372 struct vattr *a_vap; 373 struct ucred *a_cred; 374 struct thread *a_td; 375 } */ *ap; 376 { 377 struct vnode *vp = ap->a_vp; 378 struct denode *dep = VTODE(ap->a_vp); 379 struct msdosfsmount *pmp = dep->de_pmp; 380 struct vattr *vap = ap->a_vap; 381 struct ucred *cred = ap->a_cred; 382 int error = 0; 383 384 #ifdef MSDOSFS_DEBUG 385 printf("msdosfs_setattr(): vp %p, vap %p, cred %p, p %p\n", 386 ap->a_vp, vap, cred, ap->a_td); 387 #endif 388 389 /* 390 * Check for unsettable attributes. 391 */ 392 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 393 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 394 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 395 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 396 #ifdef MSDOSFS_DEBUG 397 printf("msdosfs_setattr(): returning EINVAL\n"); 398 printf(" va_type %d, va_nlink %x, va_fsid %lx, va_fileid %lx\n", 399 vap->va_type, vap->va_nlink, vap->va_fsid, vap->va_fileid); 400 printf(" va_blocksize %lx, va_rdev %x, va_bytes %qx, va_gen %lx\n", 401 vap->va_blocksize, vap->va_rdev, vap->va_bytes, vap->va_gen); 402 printf(" va_uid %x, va_gid %x\n", 403 vap->va_uid, vap->va_gid); 404 #endif 405 return (EINVAL); 406 } 407 if (vap->va_flags != VNOVAL) { 408 if (vp->v_mount->mnt_flag & MNT_RDONLY) 409 return (EROFS); 410 if (cred->cr_uid != pmp->pm_uid) { 411 error = priv_check_cred(cred, PRIV_VFS_ADMIN, 0); 412 if (error) 413 return (error); 414 } 415 /* 416 * We are very inconsistent about handling unsupported 417 * attributes. We ignored the access time and the 418 * read and execute bits. We were strict for the other 419 * attributes. 420 * 421 * Here we are strict, stricter than ufs in not allowing 422 * users to attempt to set SF_SETTABLE bits or anyone to 423 * set unsupported bits. However, we ignore attempts to 424 * set ATTR_ARCHIVE for directories `cp -pr' from a more 425 * sensible filesystem attempts it a lot. 426 */ 427 if (vap->va_flags & SF_SETTABLE) { 428 error = priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0); 429 if (error) 430 return (error); 431 } 432 if (vap->va_flags & ~SF_ARCHIVED) 433 return EOPNOTSUPP; 434 if (vap->va_flags & SF_ARCHIVED) 435 dep->de_Attributes &= ~ATTR_ARCHIVE; 436 else if (!(dep->de_Attributes & ATTR_DIRECTORY)) 437 dep->de_Attributes |= ATTR_ARCHIVE; 438 dep->de_flag |= DE_MODIFIED; 439 } 440 441 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 442 uid_t uid; 443 gid_t gid; 444 445 if (vp->v_mount->mnt_flag & MNT_RDONLY) 446 return (EROFS); 447 uid = vap->va_uid; 448 if (uid == (uid_t)VNOVAL) 449 uid = pmp->pm_uid; 450 gid = vap->va_gid; 451 if (gid == (gid_t)VNOVAL) 452 gid = pmp->pm_gid; 453 if (cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid || 454 (gid != pmp->pm_gid && !groupmember(gid, cred))) { 455 error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0); 456 if (error) 457 return (error); 458 } 459 if (uid != pmp->pm_uid || gid != pmp->pm_gid) 460 return EINVAL; 461 } 462 463 if (vap->va_size != VNOVAL) { 464 /* 465 * Disallow write attempts on read-only filesystems; 466 * unless the file is a socket, fifo, or a block or 467 * character device resident on the filesystem. 468 */ 469 switch (vp->v_type) { 470 case VDIR: 471 return (EISDIR); 472 /* NOT REACHED */ 473 case VLNK: 474 case VREG: 475 if (vp->v_mount->mnt_flag & MNT_RDONLY) 476 return (EROFS); 477 break; 478 default: 479 break; 480 } 481 error = detrunc(dep, vap->va_size, 0, cred, ap->a_td); 482 if (error) 483 return error; 484 } 485 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 486 if (vp->v_mount->mnt_flag & MNT_RDONLY) 487 return (EROFS); 488 if (vap->va_vaflags & VA_UTIMES_NULL) { 489 error = VOP_ACCESS(vp, VADMIN, cred, ap->a_td); 490 if (error) 491 error = VOP_ACCESS(vp, VWRITE, cred, 492 ap->a_td); 493 } else 494 error = VOP_ACCESS(vp, VADMIN, cred, ap->a_td); 495 if (vp->v_type != VDIR) { 496 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 && 497 vap->va_atime.tv_sec != VNOVAL) { 498 dep->de_flag &= ~DE_ACCESS; 499 timespec2fattime(&vap->va_atime, 0, 500 &dep->de_ADate, NULL, NULL); 501 } 502 if (vap->va_mtime.tv_sec != VNOVAL) { 503 dep->de_flag &= ~DE_UPDATE; 504 timespec2fattime(&vap->va_mtime, 0, 505 &dep->de_MDate, &dep->de_MTime, NULL); 506 } 507 dep->de_Attributes |= ATTR_ARCHIVE; 508 dep->de_flag |= DE_MODIFIED; 509 } 510 } 511 /* 512 * DOS files only have the ability to have their writability 513 * attribute set, so we use the owner write bit to set the readonly 514 * attribute. 515 */ 516 if (vap->va_mode != (mode_t)VNOVAL) { 517 if (vp->v_mount->mnt_flag & MNT_RDONLY) 518 return (EROFS); 519 if (cred->cr_uid != pmp->pm_uid) { 520 error = priv_check_cred(cred, PRIV_VFS_ADMIN, 0); 521 if (error) 522 return (error); 523 } 524 if (vp->v_type != VDIR) { 525 /* We ignore the read and execute bits. */ 526 if (vap->va_mode & VWRITE) 527 dep->de_Attributes &= ~ATTR_READONLY; 528 else 529 dep->de_Attributes |= ATTR_READONLY; 530 dep->de_Attributes |= ATTR_ARCHIVE; 531 dep->de_flag |= DE_MODIFIED; 532 } 533 } 534 return (deupdat(dep, 1)); 535 } 536 537 static int 538 msdosfs_read(ap) 539 struct vop_read_args /* { 540 struct vnode *a_vp; 541 struct uio *a_uio; 542 int a_ioflag; 543 struct ucred *a_cred; 544 } */ *ap; 545 { 546 int error = 0; 547 int blsize; 548 int isadir; 549 int orig_resid; 550 u_int n; 551 u_long diff; 552 u_long on; 553 daddr_t lbn; 554 daddr_t rablock; 555 int rasize; 556 int seqcount; 557 struct buf *bp; 558 struct vnode *vp = ap->a_vp; 559 struct denode *dep = VTODE(vp); 560 struct msdosfsmount *pmp = dep->de_pmp; 561 struct uio *uio = ap->a_uio; 562 563 if (uio->uio_offset < 0) 564 return (EINVAL); 565 566 if ((uoff_t)uio->uio_offset > DOS_FILESIZE_MAX) 567 return (0); 568 /* 569 * If they didn't ask for any data, then we are done. 570 */ 571 orig_resid = uio->uio_resid; 572 if (orig_resid <= 0) 573 return (0); 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 /* 583 * If we are operating on a directory file then be sure to 584 * do i/o with the vnode for the filesystem instead of the 585 * vnode for the directory. 586 */ 587 if (isadir) { 588 /* convert cluster # to block # */ 589 error = pcbmap(dep, lbn, &lbn, 0, &blsize); 590 if (error == E2BIG) { 591 error = EINVAL; 592 break; 593 } else if (error) 594 break; 595 error = bread(pmp->pm_devvp, lbn, blsize, NOCRED, &bp); 596 } else { 597 blsize = pmp->pm_bpcluster; 598 rablock = lbn + 1; 599 if (seqcount > 1 && 600 de_cn2off(pmp, rablock) < dep->de_FileSize) { 601 rasize = pmp->pm_bpcluster; 602 error = breadn(vp, lbn, blsize, 603 &rablock, &rasize, 1, NOCRED, &bp); 604 } else { 605 error = bread(vp, lbn, blsize, NOCRED, &bp); 606 } 607 } 608 if (error) { 609 brelse(bp); 610 break; 611 } 612 on = uio->uio_offset & pmp->pm_crbomask; 613 diff = pmp->pm_bpcluster - on; 614 n = diff > uio->uio_resid ? uio->uio_resid : diff; 615 diff = dep->de_FileSize - uio->uio_offset; 616 if (diff < n) 617 n = diff; 618 diff = blsize - bp->b_resid; 619 if (diff < n) 620 n = diff; 621 error = uiomove(bp->b_data + on, (int) n, uio); 622 brelse(bp); 623 } while (error == 0 && uio->uio_resid > 0 && n != 0); 624 if (!isadir && (error == 0 || uio->uio_resid != orig_resid) && 625 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 626 dep->de_flag |= DE_ACCESS; 627 return (error); 628 } 629 630 /* 631 * Write data to a file or directory. 632 */ 633 static int 634 msdosfs_write(ap) 635 struct vop_write_args /* { 636 struct vnode *a_vp; 637 struct uio *a_uio; 638 int a_ioflag; 639 struct ucred *a_cred; 640 } */ *ap; 641 { 642 int n; 643 int croffset; 644 int resid; 645 u_long osize; 646 int error = 0; 647 u_long count; 648 daddr_t bn, lastcn; 649 struct buf *bp; 650 int ioflag = ap->a_ioflag; 651 struct uio *uio = ap->a_uio; 652 struct thread *td = uio->uio_td; 653 struct vnode *vp = ap->a_vp; 654 struct vnode *thisvp; 655 struct denode *dep = VTODE(vp); 656 struct msdosfsmount *pmp = dep->de_pmp; 657 struct ucred *cred = ap->a_cred; 658 659 #ifdef MSDOSFS_DEBUG 660 printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n", 661 vp, uio, ioflag, cred); 662 printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n", 663 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster); 664 #endif 665 666 switch (vp->v_type) { 667 case VREG: 668 if (ioflag & IO_APPEND) 669 uio->uio_offset = dep->de_FileSize; 670 thisvp = vp; 671 break; 672 case VDIR: 673 return EISDIR; 674 default: 675 panic("msdosfs_write(): bad file type"); 676 } 677 678 if (uio->uio_offset < 0) 679 return (EFBIG); 680 681 if (uio->uio_resid == 0) 682 return (0); 683 684 /* 685 * If they've exceeded their filesize limit, tell them about it. 686 */ 687 if (td != NULL) { 688 PROC_LOCK(td->td_proc); 689 if ((uoff_t)uio->uio_offset + uio->uio_resid > 690 lim_cur(td->td_proc, RLIMIT_FSIZE)) { 691 psignal(td->td_proc, SIGXFSZ); 692 PROC_UNLOCK(td->td_proc); 693 return (EFBIG); 694 } 695 PROC_UNLOCK(td->td_proc); 696 } 697 698 if ((uoff_t)uio->uio_offset + uio->uio_resid > DOS_FILESIZE_MAX) 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 do { 734 if (de_cluster(pmp, uio->uio_offset) > lastcn) { 735 error = ENOSPC; 736 break; 737 } 738 739 croffset = uio->uio_offset & pmp->pm_crbomask; 740 n = min(uio->uio_resid, pmp->pm_bpcluster - croffset); 741 if (uio->uio_offset + n > dep->de_FileSize) { 742 dep->de_FileSize = uio->uio_offset + n; 743 /* The object size needs to be set before buffer is allocated */ 744 vnode_pager_setsize(vp, dep->de_FileSize); 745 } 746 747 bn = de_cluster(pmp, uio->uio_offset); 748 if ((uio->uio_offset & pmp->pm_crbomask) == 0 749 && (de_cluster(pmp, uio->uio_offset + uio->uio_resid) 750 > de_cluster(pmp, uio->uio_offset) 751 || uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) { 752 /* 753 * If either the whole cluster gets written, 754 * or we write the cluster from its start beyond EOF, 755 * then no need to read data from disk. 756 */ 757 bp = getblk(thisvp, bn, pmp->pm_bpcluster, 0, 0, 0); 758 clrbuf(bp); 759 /* 760 * Do the bmap now, since pcbmap needs buffers 761 * for the fat table. (see msdosfs_strategy) 762 */ 763 if (bp->b_blkno == bp->b_lblkno) { 764 error = pcbmap(dep, bp->b_lblkno, &bn, 0, 0); 765 if (error) 766 bp->b_blkno = -1; 767 else 768 bp->b_blkno = bn; 769 } 770 if (bp->b_blkno == -1) { 771 brelse(bp); 772 if (!error) 773 error = EIO; /* XXX */ 774 break; 775 } 776 } else { 777 /* 778 * The block we need to write into exists, so read it in. 779 */ 780 error = bread(thisvp, bn, pmp->pm_bpcluster, cred, &bp); 781 if (error) { 782 brelse(bp); 783 break; 784 } 785 } 786 787 /* 788 * Should these vnode_pager_* functions be done on dir 789 * files? 790 */ 791 792 /* 793 * Copy the data from user space into the buf header. 794 */ 795 error = uiomove(bp->b_data + croffset, n, uio); 796 if (error) { 797 brelse(bp); 798 break; 799 } 800 801 /* 802 * If they want this synchronous then write it and wait for 803 * it. Otherwise, if on a cluster boundary write it 804 * asynchronously so we can move on to the next block 805 * without delay. Otherwise do a delayed write because we 806 * may want to write somemore into the block later. 807 */ 808 if (ioflag & IO_SYNC) 809 (void) bwrite(bp); 810 else if (n + croffset == pmp->pm_bpcluster) 811 bawrite(bp); 812 else 813 bdwrite(bp); 814 dep->de_flag |= DE_UPDATE; 815 } while (error == 0 && uio->uio_resid > 0); 816 817 /* 818 * If the write failed and they want us to, truncate the file back 819 * to the size it was before the write was attempted. 820 */ 821 errexit: 822 if (error) { 823 if (ioflag & IO_UNIT) { 824 detrunc(dep, osize, ioflag & IO_SYNC, NOCRED, NULL); 825 uio->uio_offset -= resid - uio->uio_resid; 826 uio->uio_resid = resid; 827 } else { 828 detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC, NOCRED, NULL); 829 if (uio->uio_resid != resid) 830 error = 0; 831 } 832 } else if (ioflag & IO_SYNC) 833 error = deupdat(dep, 1); 834 return (error); 835 } 836 837 /* 838 * Flush the blocks of a file to disk. 839 * 840 * This function is worthless for vnodes that represent directories. Maybe we 841 * could just do a sync if they try an fsync on a directory file. 842 */ 843 static int 844 msdosfs_fsync(ap) 845 struct vop_fsync_args /* { 846 struct vnode *a_vp; 847 struct ucred *a_cred; 848 int a_waitfor; 849 struct thread *a_td; 850 } */ *ap; 851 { 852 /* 853 * Flush our dirty buffers. 854 */ 855 vop_stdfsync(ap); 856 857 return (deupdat(VTODE(ap->a_vp), ap->a_waitfor == MNT_WAIT)); 858 } 859 860 static int 861 msdosfs_remove(ap) 862 struct vop_remove_args /* { 863 struct vnode *a_dvp; 864 struct vnode *a_vp; 865 struct componentname *a_cnp; 866 } */ *ap; 867 { 868 struct denode *dep = VTODE(ap->a_vp); 869 struct denode *ddep = VTODE(ap->a_dvp); 870 int error; 871 872 if (ap->a_vp->v_type == VDIR) 873 error = EPERM; 874 else 875 error = removede(ddep, dep); 876 #ifdef MSDOSFS_DEBUG 877 printf("msdosfs_remove(), dep %p, v_usecount %d\n", dep, ap->a_vp->v_usecount); 878 #endif 879 return (error); 880 } 881 882 /* 883 * DOS filesystems don't know what links are. 884 */ 885 static int 886 msdosfs_link(ap) 887 struct vop_link_args /* { 888 struct vnode *a_tdvp; 889 struct vnode *a_vp; 890 struct componentname *a_cnp; 891 } */ *ap; 892 { 893 return (EOPNOTSUPP); 894 } 895 896 /* 897 * Renames on files require moving the denode to a new hash queue since the 898 * denode's location is used to compute which hash queue to put the file 899 * in. Unless it is a rename in place. For example "mv a b". 900 * 901 * What follows is the basic algorithm: 902 * 903 * if (file move) { 904 * if (dest file exists) { 905 * remove dest file 906 * } 907 * if (dest and src in same directory) { 908 * rewrite name in existing directory slot 909 * } else { 910 * write new entry in dest directory 911 * update offset and dirclust in denode 912 * move denode to new hash chain 913 * clear old directory entry 914 * } 915 * } else { 916 * directory move 917 * if (dest directory exists) { 918 * if (dest is not empty) { 919 * return ENOTEMPTY 920 * } 921 * remove dest directory 922 * } 923 * if (dest and src in same directory) { 924 * rewrite name in existing entry 925 * } else { 926 * be sure dest is not a child of src directory 927 * write entry in dest directory 928 * update "." and ".." in moved directory 929 * clear old directory entry for moved directory 930 * } 931 * } 932 * 933 * On entry: 934 * source's parent directory is unlocked 935 * source file or directory is unlocked 936 * destination's parent directory is locked 937 * destination file or directory is locked if it exists 938 * 939 * On exit: 940 * all denodes should be released 941 */ 942 static int 943 msdosfs_rename(ap) 944 struct vop_rename_args /* { 945 struct vnode *a_fdvp; 946 struct vnode *a_fvp; 947 struct componentname *a_fcnp; 948 struct vnode *a_tdvp; 949 struct vnode *a_tvp; 950 struct componentname *a_tcnp; 951 } */ *ap; 952 { 953 struct vnode *tdvp = ap->a_tdvp; 954 struct vnode *fvp = ap->a_fvp; 955 struct vnode *fdvp = ap->a_fdvp; 956 struct vnode *tvp = ap->a_tvp; 957 struct componentname *tcnp = ap->a_tcnp; 958 struct componentname *fcnp = ap->a_fcnp; 959 struct thread *td = fcnp->cn_thread; 960 struct denode *ip, *xp, *dp, *zp; 961 u_char toname[11], oldname[11]; 962 u_long from_diroffset, to_diroffset; 963 u_char to_count; 964 int doingdirectory = 0, newparent = 0; 965 int error; 966 u_long cn; 967 daddr_t bn; 968 struct denode *fddep; /* from file's parent directory */ 969 struct msdosfsmount *pmp; 970 struct direntry *dotdotp; 971 struct buf *bp; 972 973 fddep = VTODE(ap->a_fdvp); 974 pmp = fddep->de_pmp; 975 976 pmp = VFSTOMSDOSFS(fdvp->v_mount); 977 978 #ifdef DIAGNOSTIC 979 if ((tcnp->cn_flags & HASBUF) == 0 || 980 (fcnp->cn_flags & HASBUF) == 0) 981 panic("msdosfs_rename: no name"); 982 #endif 983 /* 984 * Check for cross-device rename. 985 */ 986 if ((fvp->v_mount != tdvp->v_mount) || 987 (tvp && (fvp->v_mount != tvp->v_mount))) { 988 error = EXDEV; 989 abortit: 990 if (tdvp == tvp) 991 vrele(tdvp); 992 else 993 vput(tdvp); 994 if (tvp) 995 vput(tvp); 996 vrele(fdvp); 997 vrele(fvp); 998 return (error); 999 } 1000 1001 /* 1002 * If source and dest are the same, do nothing. 1003 */ 1004 if (tvp == fvp) { 1005 error = 0; 1006 goto abortit; 1007 } 1008 1009 error = vn_lock(fvp, LK_EXCLUSIVE, td); 1010 if (error) 1011 goto abortit; 1012 dp = VTODE(fdvp); 1013 ip = VTODE(fvp); 1014 1015 /* 1016 * Be sure we are not renaming ".", "..", or an alias of ".". This 1017 * leads to a crippled directory tree. It's pretty tough to do a 1018 * "ls" or "pwd" with the "." directory entry missing, and "cd .." 1019 * doesn't work if the ".." entry is missing. 1020 */ 1021 if (ip->de_Attributes & ATTR_DIRECTORY) { 1022 /* 1023 * Avoid ".", "..", and aliases of "." for obvious reasons. 1024 */ 1025 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 1026 dp == ip || 1027 (fcnp->cn_flags & ISDOTDOT) || 1028 (tcnp->cn_flags & ISDOTDOT) || 1029 (ip->de_flag & DE_RENAME)) { 1030 VOP_UNLOCK(fvp, 0, td); 1031 error = EINVAL; 1032 goto abortit; 1033 } 1034 ip->de_flag |= DE_RENAME; 1035 doingdirectory++; 1036 } 1037 1038 /* 1039 * When the target exists, both the directory 1040 * and target vnodes are returned locked. 1041 */ 1042 dp = VTODE(tdvp); 1043 xp = tvp ? VTODE(tvp) : NULL; 1044 /* 1045 * Remember direntry place to use for destination 1046 */ 1047 to_diroffset = dp->de_fndoffset; 1048 to_count = dp->de_fndcnt; 1049 1050 /* 1051 * If ".." must be changed (ie the directory gets a new 1052 * parent) then the source directory must not be in the 1053 * directory heirarchy above the target, as this would 1054 * orphan everything below the source directory. Also 1055 * the user must have write permission in the source so 1056 * as to be able to change "..". We must repeat the call 1057 * to namei, as the parent directory is unlocked by the 1058 * call to doscheckpath(). 1059 */ 1060 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread); 1061 VOP_UNLOCK(fvp, 0, td); 1062 if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster) 1063 newparent = 1; 1064 if (doingdirectory && newparent) { 1065 if (error) /* write access check above */ 1066 goto bad; 1067 if (xp != NULL) 1068 vput(tvp); 1069 /* 1070 * doscheckpath() vput()'s dp, 1071 * so we have to do a relookup afterwards 1072 */ 1073 error = doscheckpath(ip, dp); 1074 if (error) 1075 goto out; 1076 if ((tcnp->cn_flags & SAVESTART) == 0) 1077 panic("msdosfs_rename: lost to startdir"); 1078 error = relookup(tdvp, &tvp, tcnp); 1079 if (error) 1080 goto out; 1081 dp = VTODE(tdvp); 1082 xp = tvp ? VTODE(tvp) : NULL; 1083 } 1084 1085 if (xp != NULL) { 1086 /* 1087 * Target must be empty if a directory and have no links 1088 * to it. Also, ensure source and target are compatible 1089 * (both directories, or both not directories). 1090 */ 1091 if (xp->de_Attributes & ATTR_DIRECTORY) { 1092 if (!dosdirempty(xp)) { 1093 error = ENOTEMPTY; 1094 goto bad; 1095 } 1096 if (!doingdirectory) { 1097 error = ENOTDIR; 1098 goto bad; 1099 } 1100 cache_purge(tdvp); 1101 } else if (doingdirectory) { 1102 error = EISDIR; 1103 goto bad; 1104 } 1105 error = removede(dp, xp); 1106 if (error) 1107 goto bad; 1108 vput(tvp); 1109 xp = NULL; 1110 } 1111 1112 /* 1113 * Convert the filename in tcnp into a dos filename. We copy this 1114 * into the denode and directory entry for the destination 1115 * file/directory. 1116 */ 1117 error = uniqdosname(VTODE(tdvp), tcnp, toname); 1118 if (error) 1119 goto abortit; 1120 1121 /* 1122 * Since from wasn't locked at various places above, 1123 * have to do a relookup here. 1124 */ 1125 fcnp->cn_flags &= ~MODMASK; 1126 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 1127 if ((fcnp->cn_flags & SAVESTART) == 0) 1128 panic("msdosfs_rename: lost from startdir"); 1129 if (!newparent) 1130 VOP_UNLOCK(tdvp, 0, td); 1131 if (relookup(fdvp, &fvp, fcnp) == 0) 1132 vrele(fdvp); 1133 if (fvp == NULL) { 1134 /* 1135 * From name has disappeared. 1136 */ 1137 if (doingdirectory) 1138 panic("rename: lost dir entry"); 1139 if (newparent) 1140 VOP_UNLOCK(tdvp, 0, td); 1141 vrele(tdvp); 1142 vrele(ap->a_fvp); 1143 return 0; 1144 } 1145 xp = VTODE(fvp); 1146 zp = VTODE(fdvp); 1147 from_diroffset = zp->de_fndoffset; 1148 1149 /* 1150 * Ensure that the directory entry still exists and has not 1151 * changed till now. If the source is a file the entry may 1152 * have been unlinked or renamed. In either case there is 1153 * no further work to be done. If the source is a directory 1154 * then it cannot have been rmdir'ed or renamed; this is 1155 * prohibited by the DE_RENAME flag. 1156 */ 1157 if (xp != ip) { 1158 if (doingdirectory) 1159 panic("rename: lost dir entry"); 1160 VOP_UNLOCK(fvp, 0, td); 1161 if (newparent) 1162 VOP_UNLOCK(fdvp, 0, td); 1163 vrele(ap->a_fvp); 1164 xp = NULL; 1165 } else { 1166 vrele(fvp); 1167 xp = NULL; 1168 1169 /* 1170 * First write a new entry in the destination 1171 * directory and mark the entry in the source directory 1172 * as deleted. Then move the denode to the correct hash 1173 * chain for its new location in the filesystem. And, if 1174 * we moved a directory, then update its .. entry to point 1175 * to the new parent directory. 1176 */ 1177 bcopy(ip->de_Name, oldname, 11); 1178 bcopy(toname, ip->de_Name, 11); /* update denode */ 1179 dp->de_fndoffset = to_diroffset; 1180 dp->de_fndcnt = to_count; 1181 error = createde(ip, dp, (struct denode **)0, tcnp); 1182 if (error) { 1183 bcopy(oldname, ip->de_Name, 11); 1184 if (newparent) 1185 VOP_UNLOCK(fdvp, 0, td); 1186 VOP_UNLOCK(fvp, 0, td); 1187 goto bad; 1188 } 1189 ip->de_refcnt++; 1190 zp->de_fndoffset = from_diroffset; 1191 error = removede(zp, ip); 1192 if (error) { 1193 /* XXX should downgrade to ro here, fs is corrupt */ 1194 if (newparent) 1195 VOP_UNLOCK(fdvp, 0, td); 1196 VOP_UNLOCK(fvp, 0, td); 1197 goto bad; 1198 } 1199 if (!doingdirectory) { 1200 error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0, 1201 &ip->de_dirclust, 0); 1202 if (error) { 1203 /* XXX should downgrade to ro here, fs is corrupt */ 1204 if (newparent) 1205 VOP_UNLOCK(fdvp, 0, td); 1206 VOP_UNLOCK(fvp, 0, td); 1207 goto bad; 1208 } 1209 if (ip->de_dirclust == MSDOSFSROOT) 1210 ip->de_diroffset = to_diroffset; 1211 else 1212 ip->de_diroffset = to_diroffset & pmp->pm_crbomask; 1213 } 1214 reinsert(ip); 1215 if (newparent) 1216 VOP_UNLOCK(fdvp, 0, td); 1217 } 1218 1219 /* 1220 * If we moved a directory to a new parent directory, then we must 1221 * fixup the ".." entry in the moved directory. 1222 */ 1223 if (doingdirectory && newparent) { 1224 cn = ip->de_StartCluster; 1225 if (cn == MSDOSFSROOT) { 1226 /* this should never happen */ 1227 panic("msdosfs_rename(): updating .. in root directory?"); 1228 } else 1229 bn = cntobn(pmp, cn); 1230 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, 1231 NOCRED, &bp); 1232 if (error) { 1233 /* XXX should downgrade to ro here, fs is corrupt */ 1234 brelse(bp); 1235 VOP_UNLOCK(fvp, 0, td); 1236 goto bad; 1237 } 1238 dotdotp = (struct direntry *)bp->b_data + 1; 1239 putushort(dotdotp->deStartCluster, dp->de_StartCluster); 1240 if (FAT32(pmp)) 1241 putushort(dotdotp->deHighClust, dp->de_StartCluster >> 16); 1242 error = bwrite(bp); 1243 if (error) { 1244 /* XXX should downgrade to ro here, fs is corrupt */ 1245 VOP_UNLOCK(fvp, 0, td); 1246 goto bad; 1247 } 1248 } 1249 1250 VOP_UNLOCK(fvp, 0, td); 1251 bad: 1252 if (xp) 1253 vput(tvp); 1254 vput(tdvp); 1255 out: 1256 ip->de_flag &= ~DE_RENAME; 1257 vrele(fdvp); 1258 vrele(fvp); 1259 return (error); 1260 1261 } 1262 1263 static struct { 1264 struct direntry dot; 1265 struct direntry dotdot; 1266 } dosdirtemplate = { 1267 { ". ", " ", /* the . entry */ 1268 ATTR_DIRECTORY, /* file attribute */ 1269 0, /* reserved */ 1270 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1271 { 0, 0 }, /* access date */ 1272 { 0, 0 }, /* high bits of start cluster */ 1273 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1274 { 0, 0 }, /* startcluster */ 1275 { 0, 0, 0, 0 } /* filesize */ 1276 }, 1277 { ".. ", " ", /* the .. entry */ 1278 ATTR_DIRECTORY, /* file attribute */ 1279 0, /* reserved */ 1280 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1281 { 0, 0 }, /* access date */ 1282 { 0, 0 }, /* high bits of start cluster */ 1283 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1284 { 0, 0 }, /* startcluster */ 1285 { 0, 0, 0, 0 } /* filesize */ 1286 } 1287 }; 1288 1289 static int 1290 msdosfs_mkdir(ap) 1291 struct vop_mkdir_args /* { 1292 struct vnode *a_dvp; 1293 struvt vnode **a_vpp; 1294 struvt componentname *a_cnp; 1295 struct vattr *a_vap; 1296 } */ *ap; 1297 { 1298 struct componentname *cnp = ap->a_cnp; 1299 struct denode *dep; 1300 struct denode *pdep = VTODE(ap->a_dvp); 1301 struct direntry *denp; 1302 struct msdosfsmount *pmp = pdep->de_pmp; 1303 struct buf *bp; 1304 u_long newcluster, pcl; 1305 int bn; 1306 int error; 1307 struct denode ndirent; 1308 struct timespec ts; 1309 1310 /* 1311 * If this is the root directory and there is no space left we 1312 * can't do anything. This is because the root directory can not 1313 * change size. 1314 */ 1315 if (pdep->de_StartCluster == MSDOSFSROOT 1316 && pdep->de_fndoffset >= pdep->de_FileSize) { 1317 error = ENOSPC; 1318 goto bad2; 1319 } 1320 1321 /* 1322 * Allocate a cluster to hold the about to be created directory. 1323 */ 1324 error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL); 1325 if (error) 1326 goto bad2; 1327 1328 bzero(&ndirent, sizeof(ndirent)); 1329 ndirent.de_pmp = pmp; 1330 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 1331 getnanotime(&ts); 1332 DETIMES(&ndirent, &ts, &ts, &ts); 1333 1334 /* 1335 * Now fill the cluster with the "." and ".." entries. And write 1336 * the cluster to disk. This way it is there for the parent 1337 * directory to be pointing at if there were a crash. 1338 */ 1339 bn = cntobn(pmp, newcluster); 1340 /* always succeeds */ 1341 bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0, 0); 1342 bzero(bp->b_data, pmp->pm_bpcluster); 1343 bcopy(&dosdirtemplate, bp->b_data, sizeof dosdirtemplate); 1344 denp = (struct direntry *)bp->b_data; 1345 putushort(denp[0].deStartCluster, newcluster); 1346 putushort(denp[0].deCDate, ndirent.de_CDate); 1347 putushort(denp[0].deCTime, ndirent.de_CTime); 1348 denp[0].deCHundredth = ndirent.de_CHun; 1349 putushort(denp[0].deADate, ndirent.de_ADate); 1350 putushort(denp[0].deMDate, ndirent.de_MDate); 1351 putushort(denp[0].deMTime, ndirent.de_MTime); 1352 pcl = pdep->de_StartCluster; 1353 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1354 pcl = 0; 1355 putushort(denp[1].deStartCluster, pcl); 1356 putushort(denp[1].deCDate, ndirent.de_CDate); 1357 putushort(denp[1].deCTime, ndirent.de_CTime); 1358 denp[1].deCHundredth = ndirent.de_CHun; 1359 putushort(denp[1].deADate, ndirent.de_ADate); 1360 putushort(denp[1].deMDate, ndirent.de_MDate); 1361 putushort(denp[1].deMTime, ndirent.de_MTime); 1362 if (FAT32(pmp)) { 1363 putushort(denp[0].deHighClust, newcluster >> 16); 1364 putushort(denp[1].deHighClust, pdep->de_StartCluster >> 16); 1365 } 1366 1367 error = bwrite(bp); 1368 if (error) 1369 goto bad; 1370 1371 /* 1372 * Now build up a directory entry pointing to the newly allocated 1373 * cluster. This will be written to an empty slot in the parent 1374 * directory. 1375 */ 1376 #ifdef DIAGNOSTIC 1377 if ((cnp->cn_flags & HASBUF) == 0) 1378 panic("msdosfs_mkdir: no name"); 1379 #endif 1380 error = uniqdosname(pdep, cnp, ndirent.de_Name); 1381 if (error) 1382 goto bad; 1383 1384 ndirent.de_Attributes = ATTR_DIRECTORY; 1385 ndirent.de_LowerCase = 0; 1386 ndirent.de_StartCluster = newcluster; 1387 ndirent.de_FileSize = 0; 1388 ndirent.de_dev = pdep->de_dev; 1389 error = createde(&ndirent, pdep, &dep, cnp); 1390 if (error) 1391 goto bad; 1392 *ap->a_vpp = DETOV(dep); 1393 return (0); 1394 1395 bad: 1396 clusterfree(pmp, newcluster, NULL); 1397 bad2: 1398 return (error); 1399 } 1400 1401 static int 1402 msdosfs_rmdir(ap) 1403 struct vop_rmdir_args /* { 1404 struct vnode *a_dvp; 1405 struct vnode *a_vp; 1406 struct componentname *a_cnp; 1407 } */ *ap; 1408 { 1409 struct vnode *vp = ap->a_vp; 1410 struct vnode *dvp = ap->a_dvp; 1411 struct componentname *cnp = ap->a_cnp; 1412 struct denode *ip, *dp; 1413 struct thread *td = cnp->cn_thread; 1414 int error; 1415 1416 ip = VTODE(vp); 1417 dp = VTODE(dvp); 1418 1419 /* 1420 * Verify the directory is empty (and valid). 1421 * (Rmdir ".." won't be valid since 1422 * ".." will contain a reference to 1423 * the current directory and thus be 1424 * non-empty.) 1425 */ 1426 error = 0; 1427 if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) { 1428 error = ENOTEMPTY; 1429 goto out; 1430 } 1431 /* 1432 * Delete the entry from the directory. For dos filesystems this 1433 * gets rid of the directory entry on disk, the in memory copy 1434 * still exists but the de_refcnt is <= 0. This prevents it from 1435 * being found by deget(). When the vput() on dep is done we give 1436 * up access and eventually msdosfs_reclaim() will be called which 1437 * will remove it from the denode cache. 1438 */ 1439 error = removede(dp, ip); 1440 if (error) 1441 goto out; 1442 /* 1443 * This is where we decrement the link count in the parent 1444 * directory. Since dos filesystems don't do this we just purge 1445 * the name cache. 1446 */ 1447 cache_purge(dvp); 1448 VOP_UNLOCK(dvp, 0, td); 1449 /* 1450 * Truncate the directory that is being deleted. 1451 */ 1452 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred, td); 1453 cache_purge(vp); 1454 1455 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td); 1456 out: 1457 return (error); 1458 } 1459 1460 /* 1461 * DOS filesystems don't know what symlinks are. 1462 */ 1463 static int 1464 msdosfs_symlink(ap) 1465 struct vop_symlink_args /* { 1466 struct vnode *a_dvp; 1467 struct vnode **a_vpp; 1468 struct componentname *a_cnp; 1469 struct vattr *a_vap; 1470 char *a_target; 1471 } */ *ap; 1472 { 1473 return (EOPNOTSUPP); 1474 } 1475 1476 static int 1477 msdosfs_readdir(ap) 1478 struct vop_readdir_args /* { 1479 struct vnode *a_vp; 1480 struct uio *a_uio; 1481 struct ucred *a_cred; 1482 int *a_eofflag; 1483 int *a_ncookies; 1484 u_long **a_cookies; 1485 } */ *ap; 1486 { 1487 int error = 0; 1488 int diff; 1489 long n; 1490 int blsize; 1491 long on; 1492 u_long cn; 1493 uint64_t fileno; 1494 u_long dirsperblk; 1495 long bias = 0; 1496 daddr_t bn, lbn; 1497 struct buf *bp; 1498 struct denode *dep = VTODE(ap->a_vp); 1499 struct msdosfsmount *pmp = dep->de_pmp; 1500 struct direntry *dentp; 1501 struct dirent dirbuf; 1502 struct uio *uio = ap->a_uio; 1503 u_long *cookies = NULL; 1504 int ncookies = 0; 1505 off_t offset, off; 1506 int chksum = -1; 1507 1508 #ifdef MSDOSFS_DEBUG 1509 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n", 1510 ap->a_vp, uio, ap->a_cred, ap->a_eofflag); 1511 #endif 1512 1513 /* 1514 * msdosfs_readdir() won't operate properly on regular files since 1515 * it does i/o only with the the filesystem vnode, and hence can 1516 * retrieve the wrong block from the buffer cache for a plain file. 1517 * So, fail attempts to readdir() on a plain file. 1518 */ 1519 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) 1520 return (ENOTDIR); 1521 1522 /* 1523 * To be safe, initialize dirbuf 1524 */ 1525 bzero(dirbuf.d_name, sizeof(dirbuf.d_name)); 1526 1527 /* 1528 * If the user buffer is smaller than the size of one dos directory 1529 * entry or the file offset is not a multiple of the size of a 1530 * directory entry, then we fail the read. 1531 */ 1532 off = offset = uio->uio_offset; 1533 if (uio->uio_resid < sizeof(struct direntry) || 1534 (offset & (sizeof(struct direntry) - 1))) 1535 return (EINVAL); 1536 1537 if (ap->a_ncookies) { 1538 ncookies = uio->uio_resid / 16; 1539 MALLOC(cookies, u_long *, ncookies * sizeof(u_long), M_TEMP, 1540 M_WAITOK); 1541 *ap->a_cookies = cookies; 1542 *ap->a_ncookies = ncookies; 1543 } 1544 1545 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 1546 1547 /* 1548 * If they are reading from the root directory then, we simulate 1549 * the . and .. entries since these don't exist in the root 1550 * directory. We also set the offset bias to make up for having to 1551 * simulate these entries. By this I mean that at file offset 64 we 1552 * read the first entry in the root directory that lives on disk. 1553 */ 1554 if (dep->de_StartCluster == MSDOSFSROOT 1555 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) { 1556 #if 0 1557 printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n", 1558 offset); 1559 #endif 1560 bias = 2 * sizeof(struct direntry); 1561 if (offset < bias) { 1562 for (n = (int)offset / sizeof(struct direntry); 1563 n < 2; n++) { 1564 if (FAT32(pmp)) 1565 fileno = (uint64_t)cntobn(pmp, 1566 pmp->pm_rootdirblk) 1567 * dirsperblk; 1568 else 1569 fileno = 1; 1570 if (pmp->pm_flags & MSDOSFS_LARGEFS) { 1571 dirbuf.d_fileno = 1572 msdosfs_fileno_map(pmp->pm_mountp, 1573 fileno); 1574 } else { 1575 1576 dirbuf.d_fileno = (uint32_t)fileno; 1577 } 1578 dirbuf.d_type = DT_DIR; 1579 switch (n) { 1580 case 0: 1581 dirbuf.d_namlen = 1; 1582 strcpy(dirbuf.d_name, "."); 1583 break; 1584 case 1: 1585 dirbuf.d_namlen = 2; 1586 strcpy(dirbuf.d_name, ".."); 1587 break; 1588 } 1589 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1590 if (uio->uio_resid < dirbuf.d_reclen) 1591 goto out; 1592 error = uiomove(&dirbuf, dirbuf.d_reclen, uio); 1593 if (error) 1594 goto out; 1595 offset += sizeof(struct direntry); 1596 off = offset; 1597 if (cookies) { 1598 *cookies++ = offset; 1599 if (--ncookies <= 0) 1600 goto out; 1601 } 1602 } 1603 } 1604 } 1605 1606 mbnambuf_init(); 1607 off = offset; 1608 while (uio->uio_resid > 0) { 1609 lbn = de_cluster(pmp, offset - bias); 1610 on = (offset - bias) & pmp->pm_crbomask; 1611 n = min(pmp->pm_bpcluster - on, uio->uio_resid); 1612 diff = dep->de_FileSize - (offset - bias); 1613 if (diff <= 0) 1614 break; 1615 n = min(n, diff); 1616 error = pcbmap(dep, lbn, &bn, &cn, &blsize); 1617 if (error) 1618 break; 1619 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp); 1620 if (error) { 1621 brelse(bp); 1622 return (error); 1623 } 1624 n = min(n, blsize - bp->b_resid); 1625 if (n == 0) { 1626 brelse(bp); 1627 return (EIO); 1628 } 1629 1630 /* 1631 * Convert from dos directory entries to fs-independent 1632 * directory entries. 1633 */ 1634 for (dentp = (struct direntry *)(bp->b_data + on); 1635 (char *)dentp < bp->b_data + on + n; 1636 dentp++, offset += sizeof(struct direntry)) { 1637 #if 0 1638 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n", 1639 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes); 1640 #endif 1641 /* 1642 * If this is an unused entry, we can stop. 1643 */ 1644 if (dentp->deName[0] == SLOT_EMPTY) { 1645 brelse(bp); 1646 goto out; 1647 } 1648 /* 1649 * Skip deleted entries. 1650 */ 1651 if (dentp->deName[0] == SLOT_DELETED) { 1652 chksum = -1; 1653 mbnambuf_init(); 1654 continue; 1655 } 1656 1657 /* 1658 * Handle Win95 long directory entries 1659 */ 1660 if (dentp->deAttributes == ATTR_WIN95) { 1661 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) 1662 continue; 1663 chksum = win2unixfn((struct winentry *)dentp, 1664 chksum, pmp); 1665 continue; 1666 } 1667 1668 /* 1669 * Skip volume labels 1670 */ 1671 if (dentp->deAttributes & ATTR_VOLUME) { 1672 chksum = -1; 1673 mbnambuf_init(); 1674 continue; 1675 } 1676 /* 1677 * This computation of d_fileno must match 1678 * the computation of va_fileid in 1679 * msdosfs_getattr. 1680 */ 1681 if (dentp->deAttributes & ATTR_DIRECTORY) { 1682 fileno = getushort(dentp->deStartCluster); 1683 if (FAT32(pmp)) 1684 fileno |= getushort(dentp->deHighClust) << 16; 1685 /* if this is the root directory */ 1686 if (fileno == MSDOSFSROOT) 1687 if (FAT32(pmp)) 1688 fileno = (uint64_t)cntobn(pmp, 1689 pmp->pm_rootdirblk) 1690 * dirsperblk; 1691 else 1692 fileno = 1; 1693 else 1694 fileno = (uint64_t)cntobn(pmp, fileno) * 1695 dirsperblk; 1696 dirbuf.d_type = DT_DIR; 1697 } else { 1698 fileno = (uint64_t)offset / sizeof(struct direntry); 1699 dirbuf.d_type = DT_REG; 1700 } 1701 if (pmp->pm_flags & MSDOSFS_LARGEFS) { 1702 dirbuf.d_fileno = 1703 msdosfs_fileno_map(pmp->pm_mountp, fileno); 1704 } else 1705 dirbuf.d_fileno = (uint32_t)fileno; 1706 1707 if (chksum != winChksum(dentp)) { 1708 dirbuf.d_namlen = dos2unixfn(dentp->deName, 1709 (u_char *)dirbuf.d_name, 1710 dentp->deLowerCase | 1711 ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ? 1712 (LCASE_BASE | LCASE_EXT) : 0), 1713 pmp); 1714 mbnambuf_init(); 1715 } else 1716 mbnambuf_flush(&dirbuf); 1717 chksum = -1; 1718 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1719 if (uio->uio_resid < dirbuf.d_reclen) { 1720 brelse(bp); 1721 goto out; 1722 } 1723 error = uiomove(&dirbuf, dirbuf.d_reclen, uio); 1724 if (error) { 1725 brelse(bp); 1726 goto out; 1727 } 1728 if (cookies) { 1729 *cookies++ = offset + sizeof(struct direntry); 1730 if (--ncookies <= 0) { 1731 brelse(bp); 1732 goto out; 1733 } 1734 } 1735 off = offset + sizeof(struct direntry); 1736 } 1737 brelse(bp); 1738 } 1739 out: 1740 /* Subtract unused cookies */ 1741 if (ap->a_ncookies) 1742 *ap->a_ncookies -= ncookies; 1743 1744 uio->uio_offset = off; 1745 1746 /* 1747 * Set the eofflag (NFS uses it) 1748 */ 1749 if (ap->a_eofflag) { 1750 if (dep->de_FileSize - (offset - bias) <= 0) 1751 *ap->a_eofflag = 1; 1752 else 1753 *ap->a_eofflag = 0; 1754 } 1755 return (error); 1756 } 1757 1758 /* 1759 * vp - address of vnode file the file 1760 * bn - which cluster we are interested in mapping to a filesystem block number. 1761 * vpp - returns the vnode for the block special file holding the filesystem 1762 * containing the file of interest 1763 * bnp - address of where to return the filesystem relative block number 1764 */ 1765 static int 1766 msdosfs_bmap(ap) 1767 struct vop_bmap_args /* { 1768 struct vnode *a_vp; 1769 daddr_t a_bn; 1770 struct bufobj **a_bop; 1771 daddr_t *a_bnp; 1772 int *a_runp; 1773 int *a_runb; 1774 } */ *ap; 1775 { 1776 struct denode *dep = VTODE(ap->a_vp); 1777 daddr_t blkno; 1778 int error; 1779 1780 if (ap->a_bop != NULL) 1781 *ap->a_bop = &dep->de_pmp->pm_devvp->v_bufobj; 1782 if (ap->a_bnp == NULL) 1783 return (0); 1784 if (ap->a_runp) { 1785 /* 1786 * Sequential clusters should be counted here. 1787 */ 1788 *ap->a_runp = 0; 1789 } 1790 if (ap->a_runb) { 1791 *ap->a_runb = 0; 1792 } 1793 error = pcbmap(dep, ap->a_bn, &blkno, 0, 0); 1794 *ap->a_bnp = blkno; 1795 return (error); 1796 } 1797 1798 static int 1799 msdosfs_strategy(ap) 1800 struct vop_strategy_args /* { 1801 struct vnode *a_vp; 1802 struct buf *a_bp; 1803 } */ *ap; 1804 { 1805 struct buf *bp = ap->a_bp; 1806 struct denode *dep = VTODE(ap->a_vp); 1807 struct bufobj *bo; 1808 int error = 0; 1809 daddr_t blkno; 1810 1811 /* 1812 * If we don't already know the filesystem relative block number 1813 * then get it using pcbmap(). If pcbmap() returns the block 1814 * number as -1 then we've got a hole in the file. DOS filesystems 1815 * don't allow files with holes, so we shouldn't ever see this. 1816 */ 1817 if (bp->b_blkno == bp->b_lblkno) { 1818 error = pcbmap(dep, bp->b_lblkno, &blkno, 0, 0); 1819 bp->b_blkno = blkno; 1820 if (error) { 1821 bp->b_error = error; 1822 bp->b_ioflags |= BIO_ERROR; 1823 bufdone(bp); 1824 return (error); 1825 } 1826 if ((long)bp->b_blkno == -1) 1827 vfs_bio_clrbuf(bp); 1828 } 1829 if (bp->b_blkno == -1) { 1830 bufdone(bp); 1831 return (0); 1832 } 1833 /* 1834 * Read/write the block from/to the disk that contains the desired 1835 * file block. 1836 */ 1837 bp->b_iooffset = dbtob(bp->b_blkno); 1838 bo = dep->de_pmp->pm_bo; 1839 BO_STRATEGY(bo, bp); 1840 return (0); 1841 } 1842 1843 static int 1844 msdosfs_print(ap) 1845 struct vop_print_args /* { 1846 struct vnode *vp; 1847 } */ *ap; 1848 { 1849 struct denode *dep = VTODE(ap->a_vp); 1850 1851 printf("\tstartcluster %lu, dircluster %lu, diroffset %lu, ", 1852 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset); 1853 printf("on dev %s\n", devtoname(dep->de_dev)); 1854 return (0); 1855 } 1856 1857 static int 1858 msdosfs_pathconf(ap) 1859 struct vop_pathconf_args /* { 1860 struct vnode *a_vp; 1861 int a_name; 1862 int *a_retval; 1863 } */ *ap; 1864 { 1865 struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp; 1866 1867 switch (ap->a_name) { 1868 case _PC_LINK_MAX: 1869 *ap->a_retval = 1; 1870 return (0); 1871 case _PC_NAME_MAX: 1872 *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12; 1873 return (0); 1874 case _PC_PATH_MAX: 1875 *ap->a_retval = PATH_MAX; 1876 return (0); 1877 case _PC_CHOWN_RESTRICTED: 1878 *ap->a_retval = 1; 1879 return (0); 1880 case _PC_NO_TRUNC: 1881 *ap->a_retval = 0; 1882 return (0); 1883 default: 1884 return (EINVAL); 1885 } 1886 /* NOTREACHED */ 1887 } 1888 1889 static int 1890 msdosfs_advlock(ap) 1891 struct vop_advlock_args /* { 1892 struct vnode *a_vp; 1893 u_char a_id; 1894 int a_op; 1895 struct flock *a_fl; 1896 int a_flags; 1897 } */ *ap; 1898 { 1899 struct denode *dep = VTODE(ap->a_vp); 1900 1901 return (lf_advlock(ap, &dep->de_lockf, dep->de_FileSize)); 1902 } 1903 1904 static int 1905 msdosfs_vptofh(ap) 1906 struct vop_vptofh_args /* { 1907 struct vnode *a_vp; 1908 struct fid *a_fhp; 1909 } */ *ap; 1910 { 1911 struct denode *dep; 1912 struct defid *defhp; 1913 1914 dep = VTODE(ap->a_vp); 1915 defhp = (struct defid *)ap->a_fhp; 1916 defhp->defid_len = sizeof(struct defid); 1917 defhp->defid_dirclust = dep->de_dirclust; 1918 defhp->defid_dirofs = dep->de_diroffset; 1919 /* defhp->defid_gen = dep->de_gen; */ 1920 return (0); 1921 } 1922 1923 /* Global vfs data structures for msdosfs */ 1924 struct vop_vector msdosfs_vnodeops = { 1925 .vop_default = &default_vnodeops, 1926 1927 .vop_access = msdosfs_access, 1928 .vop_advlock = msdosfs_advlock, 1929 .vop_bmap = msdosfs_bmap, 1930 .vop_cachedlookup = msdosfs_lookup, 1931 .vop_open = msdosfs_open, 1932 .vop_close = msdosfs_close, 1933 .vop_create = msdosfs_create, 1934 .vop_fsync = msdosfs_fsync, 1935 .vop_getattr = msdosfs_getattr, 1936 .vop_inactive = msdosfs_inactive, 1937 .vop_link = msdosfs_link, 1938 .vop_lookup = vfs_cache_lookup, 1939 .vop_mkdir = msdosfs_mkdir, 1940 .vop_mknod = msdosfs_mknod, 1941 .vop_pathconf = msdosfs_pathconf, 1942 .vop_print = msdosfs_print, 1943 .vop_read = msdosfs_read, 1944 .vop_readdir = msdosfs_readdir, 1945 .vop_reclaim = msdosfs_reclaim, 1946 .vop_remove = msdosfs_remove, 1947 .vop_rename = msdosfs_rename, 1948 .vop_rmdir = msdosfs_rmdir, 1949 .vop_setattr = msdosfs_setattr, 1950 .vop_strategy = msdosfs_strategy, 1951 .vop_symlink = msdosfs_symlink, 1952 .vop_write = msdosfs_write, 1953 .vop_vptofh = msdosfs_vptofh, 1954 }; 1955