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, 412 SUSER_ALLOWJAIL); 413 if (error) 414 return (error); 415 } 416 /* 417 * We are very inconsistent about handling unsupported 418 * attributes. We ignored the access time and the 419 * read and execute bits. We were strict for the other 420 * attributes. 421 * 422 * Here we are strict, stricter than ufs in not allowing 423 * users to attempt to set SF_SETTABLE bits or anyone to 424 * set unsupported bits. However, we ignore attempts to 425 * set ATTR_ARCHIVE for directories `cp -pr' from a more 426 * sensible filesystem attempts it a lot. 427 */ 428 if (vap->va_flags & SF_SETTABLE) { 429 error = priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 430 SUSER_ALLOWJAIL); 431 if (error) 432 return (error); 433 } 434 if (vap->va_flags & ~SF_ARCHIVED) 435 return EOPNOTSUPP; 436 if (vap->va_flags & SF_ARCHIVED) 437 dep->de_Attributes &= ~ATTR_ARCHIVE; 438 else if (!(dep->de_Attributes & ATTR_DIRECTORY)) 439 dep->de_Attributes |= ATTR_ARCHIVE; 440 dep->de_flag |= DE_MODIFIED; 441 } 442 443 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 444 uid_t uid; 445 gid_t gid; 446 447 if (vp->v_mount->mnt_flag & MNT_RDONLY) 448 return (EROFS); 449 uid = vap->va_uid; 450 if (uid == (uid_t)VNOVAL) 451 uid = pmp->pm_uid; 452 gid = vap->va_gid; 453 if (gid == (gid_t)VNOVAL) 454 gid = pmp->pm_gid; 455 if (cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid || 456 (gid != pmp->pm_gid && !groupmember(gid, cred))) { 457 error = priv_check_cred(cred, PRIV_VFS_CHOWN, 458 SUSER_ALLOWJAIL); 459 if (error) 460 return (error); 461 } 462 if (uid != pmp->pm_uid || gid != pmp->pm_gid) 463 return EINVAL; 464 } 465 466 if (vap->va_size != VNOVAL) { 467 /* 468 * Disallow write attempts on read-only filesystems; 469 * unless the file is a socket, fifo, or a block or 470 * character device resident on the filesystem. 471 */ 472 switch (vp->v_type) { 473 case VDIR: 474 return (EISDIR); 475 /* NOT REACHED */ 476 case VLNK: 477 case VREG: 478 if (vp->v_mount->mnt_flag & MNT_RDONLY) 479 return (EROFS); 480 break; 481 default: 482 break; 483 } 484 error = detrunc(dep, vap->va_size, 0, cred, ap->a_td); 485 if (error) 486 return error; 487 } 488 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 489 if (vp->v_mount->mnt_flag & MNT_RDONLY) 490 return (EROFS); 491 if (vap->va_vaflags & VA_UTIMES_NULL) { 492 error = VOP_ACCESS(vp, VADMIN, cred, ap->a_td); 493 if (error) 494 error = VOP_ACCESS(vp, VWRITE, cred, 495 ap->a_td); 496 } else 497 error = VOP_ACCESS(vp, VADMIN, cred, ap->a_td); 498 if (vp->v_type != VDIR) { 499 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 && 500 vap->va_atime.tv_sec != VNOVAL) { 501 dep->de_flag &= ~DE_ACCESS; 502 timespec2fattime(&vap->va_atime, 0, 503 &dep->de_ADate, NULL, NULL); 504 } 505 if (vap->va_mtime.tv_sec != VNOVAL) { 506 dep->de_flag &= ~DE_UPDATE; 507 timespec2fattime(&vap->va_mtime, 0, 508 &dep->de_MDate, &dep->de_MTime, NULL); 509 } 510 dep->de_Attributes |= ATTR_ARCHIVE; 511 dep->de_flag |= DE_MODIFIED; 512 } 513 } 514 /* 515 * DOS files only have the ability to have their writability 516 * attribute set, so we use the owner write bit to set the readonly 517 * attribute. 518 */ 519 if (vap->va_mode != (mode_t)VNOVAL) { 520 if (vp->v_mount->mnt_flag & MNT_RDONLY) 521 return (EROFS); 522 if (cred->cr_uid != pmp->pm_uid) { 523 error = priv_check_cred(cred, PRIV_VFS_ADMIN, 524 SUSER_ALLOWJAIL); 525 if (error) 526 return (error); 527 } 528 if (vp->v_type != VDIR) { 529 /* We ignore the read and execute bits. */ 530 if (vap->va_mode & VWRITE) 531 dep->de_Attributes &= ~ATTR_READONLY; 532 else 533 dep->de_Attributes |= ATTR_READONLY; 534 dep->de_Attributes |= ATTR_ARCHIVE; 535 dep->de_flag |= DE_MODIFIED; 536 } 537 } 538 return (deupdat(dep, 1)); 539 } 540 541 static int 542 msdosfs_read(ap) 543 struct vop_read_args /* { 544 struct vnode *a_vp; 545 struct uio *a_uio; 546 int a_ioflag; 547 struct ucred *a_cred; 548 } */ *ap; 549 { 550 int error = 0; 551 int blsize; 552 int isadir; 553 int orig_resid; 554 u_int n; 555 u_long diff; 556 u_long on; 557 daddr_t lbn; 558 daddr_t rablock; 559 int rasize; 560 int seqcount; 561 struct buf *bp; 562 struct vnode *vp = ap->a_vp; 563 struct denode *dep = VTODE(vp); 564 struct msdosfsmount *pmp = dep->de_pmp; 565 struct uio *uio = ap->a_uio; 566 567 if (uio->uio_offset < 0) 568 return (EINVAL); 569 570 if ((uoff_t)uio->uio_offset > DOS_FILESIZE_MAX) 571 return (0); 572 /* 573 * If they didn't ask for any data, then we are done. 574 */ 575 orig_resid = uio->uio_resid; 576 if (orig_resid <= 0) 577 return (0); 578 579 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 580 581 isadir = dep->de_Attributes & ATTR_DIRECTORY; 582 do { 583 if (uio->uio_offset >= dep->de_FileSize) 584 break; 585 lbn = de_cluster(pmp, uio->uio_offset); 586 /* 587 * If we are operating on a directory file then be sure to 588 * do i/o with the vnode for the filesystem instead of the 589 * vnode for the directory. 590 */ 591 if (isadir) { 592 /* convert cluster # to block # */ 593 error = pcbmap(dep, lbn, &lbn, 0, &blsize); 594 if (error == E2BIG) { 595 error = EINVAL; 596 break; 597 } else if (error) 598 break; 599 error = bread(pmp->pm_devvp, lbn, blsize, NOCRED, &bp); 600 } else { 601 blsize = pmp->pm_bpcluster; 602 rablock = lbn + 1; 603 if (seqcount > 1 && 604 de_cn2off(pmp, rablock) < dep->de_FileSize) { 605 rasize = pmp->pm_bpcluster; 606 error = breadn(vp, lbn, blsize, 607 &rablock, &rasize, 1, NOCRED, &bp); 608 } else { 609 error = bread(vp, lbn, blsize, NOCRED, &bp); 610 } 611 } 612 if (error) { 613 brelse(bp); 614 break; 615 } 616 on = uio->uio_offset & pmp->pm_crbomask; 617 diff = pmp->pm_bpcluster - on; 618 n = diff > uio->uio_resid ? uio->uio_resid : diff; 619 diff = dep->de_FileSize - uio->uio_offset; 620 if (diff < n) 621 n = diff; 622 diff = blsize - bp->b_resid; 623 if (diff < n) 624 n = diff; 625 error = uiomove(bp->b_data + on, (int) n, uio); 626 brelse(bp); 627 } while (error == 0 && uio->uio_resid > 0 && n != 0); 628 if (!isadir && (error == 0 || uio->uio_resid != orig_resid) && 629 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 630 dep->de_flag |= DE_ACCESS; 631 return (error); 632 } 633 634 /* 635 * Write data to a file or directory. 636 */ 637 static int 638 msdosfs_write(ap) 639 struct vop_write_args /* { 640 struct vnode *a_vp; 641 struct uio *a_uio; 642 int a_ioflag; 643 struct ucred *a_cred; 644 } */ *ap; 645 { 646 int n; 647 int croffset; 648 int resid; 649 u_long osize; 650 int error = 0; 651 u_long count; 652 daddr_t bn, lastcn; 653 struct buf *bp; 654 int ioflag = ap->a_ioflag; 655 struct uio *uio = ap->a_uio; 656 struct thread *td = uio->uio_td; 657 struct vnode *vp = ap->a_vp; 658 struct vnode *thisvp; 659 struct denode *dep = VTODE(vp); 660 struct msdosfsmount *pmp = dep->de_pmp; 661 struct ucred *cred = ap->a_cred; 662 663 #ifdef MSDOSFS_DEBUG 664 printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n", 665 vp, uio, ioflag, cred); 666 printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n", 667 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster); 668 #endif 669 670 switch (vp->v_type) { 671 case VREG: 672 if (ioflag & IO_APPEND) 673 uio->uio_offset = dep->de_FileSize; 674 thisvp = vp; 675 break; 676 case VDIR: 677 return EISDIR; 678 default: 679 panic("msdosfs_write(): bad file type"); 680 } 681 682 if (uio->uio_offset < 0) 683 return (EFBIG); 684 685 if (uio->uio_resid == 0) 686 return (0); 687 688 /* 689 * If they've exceeded their filesize limit, tell them about it. 690 */ 691 if (td != NULL) { 692 PROC_LOCK(td->td_proc); 693 if ((uoff_t)uio->uio_offset + uio->uio_resid > 694 lim_cur(td->td_proc, RLIMIT_FSIZE)) { 695 psignal(td->td_proc, SIGXFSZ); 696 PROC_UNLOCK(td->td_proc); 697 return (EFBIG); 698 } 699 PROC_UNLOCK(td->td_proc); 700 } 701 702 if ((uoff_t)uio->uio_offset + uio->uio_resid > DOS_FILESIZE_MAX) 703 return (EFBIG); 704 705 /* 706 * If the offset we are starting the write at is beyond the end of 707 * the file, then they've done a seek. Unix filesystems allow 708 * files with holes in them, DOS doesn't so we must fill the hole 709 * with zeroed blocks. 710 */ 711 if (uio->uio_offset > dep->de_FileSize) { 712 error = deextend(dep, uio->uio_offset, cred); 713 if (error) 714 return (error); 715 } 716 717 /* 718 * Remember some values in case the write fails. 719 */ 720 resid = uio->uio_resid; 721 osize = dep->de_FileSize; 722 723 /* 724 * If we write beyond the end of the file, extend it to its ultimate 725 * size ahead of the time to hopefully get a contiguous area. 726 */ 727 if (uio->uio_offset + resid > osize) { 728 count = de_clcount(pmp, uio->uio_offset + resid) - 729 de_clcount(pmp, osize); 730 error = extendfile(dep, count, NULL, NULL, 0); 731 if (error && (error != ENOSPC || (ioflag & IO_UNIT))) 732 goto errexit; 733 lastcn = dep->de_fc[FC_LASTFC].fc_frcn; 734 } else 735 lastcn = de_clcount(pmp, osize) - 1; 736 737 do { 738 if (de_cluster(pmp, uio->uio_offset) > lastcn) { 739 error = ENOSPC; 740 break; 741 } 742 743 croffset = uio->uio_offset & pmp->pm_crbomask; 744 n = min(uio->uio_resid, pmp->pm_bpcluster - croffset); 745 if (uio->uio_offset + n > dep->de_FileSize) { 746 dep->de_FileSize = uio->uio_offset + n; 747 /* The object size needs to be set before buffer is allocated */ 748 vnode_pager_setsize(vp, dep->de_FileSize); 749 } 750 751 bn = de_cluster(pmp, uio->uio_offset); 752 if ((uio->uio_offset & pmp->pm_crbomask) == 0 753 && (de_cluster(pmp, uio->uio_offset + uio->uio_resid) 754 > de_cluster(pmp, uio->uio_offset) 755 || uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) { 756 /* 757 * If either the whole cluster gets written, 758 * or we write the cluster from its start beyond EOF, 759 * then no need to read data from disk. 760 */ 761 bp = getblk(thisvp, bn, pmp->pm_bpcluster, 0, 0, 0); 762 clrbuf(bp); 763 /* 764 * Do the bmap now, since pcbmap needs buffers 765 * for the fat table. (see msdosfs_strategy) 766 */ 767 if (bp->b_blkno == bp->b_lblkno) { 768 error = pcbmap(dep, bp->b_lblkno, &bn, 0, 0); 769 if (error) 770 bp->b_blkno = -1; 771 else 772 bp->b_blkno = bn; 773 } 774 if (bp->b_blkno == -1) { 775 brelse(bp); 776 if (!error) 777 error = EIO; /* XXX */ 778 break; 779 } 780 } else { 781 /* 782 * The block we need to write into exists, so read it in. 783 */ 784 error = bread(thisvp, bn, pmp->pm_bpcluster, cred, &bp); 785 if (error) { 786 brelse(bp); 787 break; 788 } 789 } 790 791 /* 792 * Should these vnode_pager_* functions be done on dir 793 * files? 794 */ 795 796 /* 797 * Copy the data from user space into the buf header. 798 */ 799 error = uiomove(bp->b_data + croffset, n, uio); 800 if (error) { 801 brelse(bp); 802 break; 803 } 804 805 /* 806 * If they want this synchronous then write it and wait for 807 * it. Otherwise, if on a cluster boundary write it 808 * asynchronously so we can move on to the next block 809 * without delay. Otherwise do a delayed write because we 810 * may want to write somemore into the block later. 811 */ 812 if (ioflag & IO_SYNC) 813 (void) bwrite(bp); 814 else if (n + croffset == pmp->pm_bpcluster) 815 bawrite(bp); 816 else 817 bdwrite(bp); 818 dep->de_flag |= DE_UPDATE; 819 } while (error == 0 && uio->uio_resid > 0); 820 821 /* 822 * If the write failed and they want us to, truncate the file back 823 * to the size it was before the write was attempted. 824 */ 825 errexit: 826 if (error) { 827 if (ioflag & IO_UNIT) { 828 detrunc(dep, osize, ioflag & IO_SYNC, NOCRED, NULL); 829 uio->uio_offset -= resid - uio->uio_resid; 830 uio->uio_resid = resid; 831 } else { 832 detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC, NOCRED, NULL); 833 if (uio->uio_resid != resid) 834 error = 0; 835 } 836 } else if (ioflag & IO_SYNC) 837 error = deupdat(dep, 1); 838 return (error); 839 } 840 841 /* 842 * Flush the blocks of a file to disk. 843 * 844 * This function is worthless for vnodes that represent directories. Maybe we 845 * could just do a sync if they try an fsync on a directory file. 846 */ 847 static int 848 msdosfs_fsync(ap) 849 struct vop_fsync_args /* { 850 struct vnode *a_vp; 851 struct ucred *a_cred; 852 int a_waitfor; 853 struct thread *a_td; 854 } */ *ap; 855 { 856 /* 857 * Flush our dirty buffers. 858 */ 859 vop_stdfsync(ap); 860 861 return (deupdat(VTODE(ap->a_vp), ap->a_waitfor == MNT_WAIT)); 862 } 863 864 static int 865 msdosfs_remove(ap) 866 struct vop_remove_args /* { 867 struct vnode *a_dvp; 868 struct vnode *a_vp; 869 struct componentname *a_cnp; 870 } */ *ap; 871 { 872 struct denode *dep = VTODE(ap->a_vp); 873 struct denode *ddep = VTODE(ap->a_dvp); 874 int error; 875 876 if (ap->a_vp->v_type == VDIR) 877 error = EPERM; 878 else 879 error = removede(ddep, dep); 880 #ifdef MSDOSFS_DEBUG 881 printf("msdosfs_remove(), dep %p, v_usecount %d\n", dep, ap->a_vp->v_usecount); 882 #endif 883 return (error); 884 } 885 886 /* 887 * DOS filesystems don't know what links are. 888 */ 889 static int 890 msdosfs_link(ap) 891 struct vop_link_args /* { 892 struct vnode *a_tdvp; 893 struct vnode *a_vp; 894 struct componentname *a_cnp; 895 } */ *ap; 896 { 897 return (EOPNOTSUPP); 898 } 899 900 /* 901 * Renames on files require moving the denode to a new hash queue since the 902 * denode's location is used to compute which hash queue to put the file 903 * in. Unless it is a rename in place. For example "mv a b". 904 * 905 * What follows is the basic algorithm: 906 * 907 * if (file move) { 908 * if (dest file exists) { 909 * remove dest file 910 * } 911 * if (dest and src in same directory) { 912 * rewrite name in existing directory slot 913 * } else { 914 * write new entry in dest directory 915 * update offset and dirclust in denode 916 * move denode to new hash chain 917 * clear old directory entry 918 * } 919 * } else { 920 * directory move 921 * if (dest directory exists) { 922 * if (dest is not empty) { 923 * return ENOTEMPTY 924 * } 925 * remove dest directory 926 * } 927 * if (dest and src in same directory) { 928 * rewrite name in existing entry 929 * } else { 930 * be sure dest is not a child of src directory 931 * write entry in dest directory 932 * update "." and ".." in moved directory 933 * clear old directory entry for moved directory 934 * } 935 * } 936 * 937 * On entry: 938 * source's parent directory is unlocked 939 * source file or directory is unlocked 940 * destination's parent directory is locked 941 * destination file or directory is locked if it exists 942 * 943 * On exit: 944 * all denodes should be released 945 */ 946 static int 947 msdosfs_rename(ap) 948 struct vop_rename_args /* { 949 struct vnode *a_fdvp; 950 struct vnode *a_fvp; 951 struct componentname *a_fcnp; 952 struct vnode *a_tdvp; 953 struct vnode *a_tvp; 954 struct componentname *a_tcnp; 955 } */ *ap; 956 { 957 struct vnode *tdvp = ap->a_tdvp; 958 struct vnode *fvp = ap->a_fvp; 959 struct vnode *fdvp = ap->a_fdvp; 960 struct vnode *tvp = ap->a_tvp; 961 struct componentname *tcnp = ap->a_tcnp; 962 struct componentname *fcnp = ap->a_fcnp; 963 struct thread *td = fcnp->cn_thread; 964 struct denode *ip, *xp, *dp, *zp; 965 u_char toname[11], oldname[11]; 966 u_long from_diroffset, to_diroffset; 967 u_char to_count; 968 int doingdirectory = 0, newparent = 0; 969 int error; 970 u_long cn; 971 daddr_t bn; 972 struct denode *fddep; /* from file's parent directory */ 973 struct msdosfsmount *pmp; 974 struct direntry *dotdotp; 975 struct buf *bp; 976 977 fddep = VTODE(ap->a_fdvp); 978 pmp = fddep->de_pmp; 979 980 pmp = VFSTOMSDOSFS(fdvp->v_mount); 981 982 #ifdef DIAGNOSTIC 983 if ((tcnp->cn_flags & HASBUF) == 0 || 984 (fcnp->cn_flags & HASBUF) == 0) 985 panic("msdosfs_rename: no name"); 986 #endif 987 /* 988 * Check for cross-device rename. 989 */ 990 if ((fvp->v_mount != tdvp->v_mount) || 991 (tvp && (fvp->v_mount != tvp->v_mount))) { 992 error = EXDEV; 993 abortit: 994 if (tdvp == tvp) 995 vrele(tdvp); 996 else 997 vput(tdvp); 998 if (tvp) 999 vput(tvp); 1000 vrele(fdvp); 1001 vrele(fvp); 1002 return (error); 1003 } 1004 1005 /* 1006 * If source and dest are the same, do nothing. 1007 */ 1008 if (tvp == fvp) { 1009 error = 0; 1010 goto abortit; 1011 } 1012 1013 error = vn_lock(fvp, LK_EXCLUSIVE, td); 1014 if (error) 1015 goto abortit; 1016 dp = VTODE(fdvp); 1017 ip = VTODE(fvp); 1018 1019 /* 1020 * Be sure we are not renaming ".", "..", or an alias of ".". This 1021 * leads to a crippled directory tree. It's pretty tough to do a 1022 * "ls" or "pwd" with the "." directory entry missing, and "cd .." 1023 * doesn't work if the ".." entry is missing. 1024 */ 1025 if (ip->de_Attributes & ATTR_DIRECTORY) { 1026 /* 1027 * Avoid ".", "..", and aliases of "." for obvious reasons. 1028 */ 1029 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 1030 dp == ip || 1031 (fcnp->cn_flags & ISDOTDOT) || 1032 (tcnp->cn_flags & ISDOTDOT) || 1033 (ip->de_flag & DE_RENAME)) { 1034 VOP_UNLOCK(fvp, 0, td); 1035 error = EINVAL; 1036 goto abortit; 1037 } 1038 ip->de_flag |= DE_RENAME; 1039 doingdirectory++; 1040 } 1041 1042 /* 1043 * When the target exists, both the directory 1044 * and target vnodes are returned locked. 1045 */ 1046 dp = VTODE(tdvp); 1047 xp = tvp ? VTODE(tvp) : NULL; 1048 /* 1049 * Remember direntry place to use for destination 1050 */ 1051 to_diroffset = dp->de_fndoffset; 1052 to_count = dp->de_fndcnt; 1053 1054 /* 1055 * If ".." must be changed (ie the directory gets a new 1056 * parent) then the source directory must not be in the 1057 * directory heirarchy above the target, as this would 1058 * orphan everything below the source directory. Also 1059 * the user must have write permission in the source so 1060 * as to be able to change "..". We must repeat the call 1061 * to namei, as the parent directory is unlocked by the 1062 * call to doscheckpath(). 1063 */ 1064 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread); 1065 VOP_UNLOCK(fvp, 0, td); 1066 if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster) 1067 newparent = 1; 1068 if (doingdirectory && newparent) { 1069 if (error) /* write access check above */ 1070 goto bad; 1071 if (xp != NULL) 1072 vput(tvp); 1073 /* 1074 * doscheckpath() vput()'s dp, 1075 * so we have to do a relookup afterwards 1076 */ 1077 error = doscheckpath(ip, dp); 1078 if (error) 1079 goto out; 1080 if ((tcnp->cn_flags & SAVESTART) == 0) 1081 panic("msdosfs_rename: lost to startdir"); 1082 error = relookup(tdvp, &tvp, tcnp); 1083 if (error) 1084 goto out; 1085 dp = VTODE(tdvp); 1086 xp = tvp ? VTODE(tvp) : NULL; 1087 } 1088 1089 if (xp != NULL) { 1090 /* 1091 * Target must be empty if a directory and have no links 1092 * to it. Also, ensure source and target are compatible 1093 * (both directories, or both not directories). 1094 */ 1095 if (xp->de_Attributes & ATTR_DIRECTORY) { 1096 if (!dosdirempty(xp)) { 1097 error = ENOTEMPTY; 1098 goto bad; 1099 } 1100 if (!doingdirectory) { 1101 error = ENOTDIR; 1102 goto bad; 1103 } 1104 cache_purge(tdvp); 1105 } else if (doingdirectory) { 1106 error = EISDIR; 1107 goto bad; 1108 } 1109 error = removede(dp, xp); 1110 if (error) 1111 goto bad; 1112 vput(tvp); 1113 xp = NULL; 1114 } 1115 1116 /* 1117 * Convert the filename in tcnp into a dos filename. We copy this 1118 * into the denode and directory entry for the destination 1119 * file/directory. 1120 */ 1121 error = uniqdosname(VTODE(tdvp), tcnp, toname); 1122 if (error) 1123 goto abortit; 1124 1125 /* 1126 * Since from wasn't locked at various places above, 1127 * have to do a relookup here. 1128 */ 1129 fcnp->cn_flags &= ~MODMASK; 1130 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 1131 if ((fcnp->cn_flags & SAVESTART) == 0) 1132 panic("msdosfs_rename: lost from startdir"); 1133 if (!newparent) 1134 VOP_UNLOCK(tdvp, 0, td); 1135 if (relookup(fdvp, &fvp, fcnp) == 0) 1136 vrele(fdvp); 1137 if (fvp == NULL) { 1138 /* 1139 * From name has disappeared. 1140 */ 1141 if (doingdirectory) 1142 panic("rename: lost dir entry"); 1143 if (newparent) 1144 VOP_UNLOCK(tdvp, 0, td); 1145 vrele(tdvp); 1146 vrele(ap->a_fvp); 1147 return 0; 1148 } 1149 xp = VTODE(fvp); 1150 zp = VTODE(fdvp); 1151 from_diroffset = zp->de_fndoffset; 1152 1153 /* 1154 * Ensure that the directory entry still exists and has not 1155 * changed till now. If the source is a file the entry may 1156 * have been unlinked or renamed. In either case there is 1157 * no further work to be done. If the source is a directory 1158 * then it cannot have been rmdir'ed or renamed; this is 1159 * prohibited by the DE_RENAME flag. 1160 */ 1161 if (xp != ip) { 1162 if (doingdirectory) 1163 panic("rename: lost dir entry"); 1164 VOP_UNLOCK(fvp, 0, td); 1165 if (newparent) 1166 VOP_UNLOCK(fdvp, 0, td); 1167 vrele(ap->a_fvp); 1168 xp = NULL; 1169 } else { 1170 vrele(fvp); 1171 xp = NULL; 1172 1173 /* 1174 * First write a new entry in the destination 1175 * directory and mark the entry in the source directory 1176 * as deleted. Then move the denode to the correct hash 1177 * chain for its new location in the filesystem. And, if 1178 * we moved a directory, then update its .. entry to point 1179 * to the new parent directory. 1180 */ 1181 bcopy(ip->de_Name, oldname, 11); 1182 bcopy(toname, ip->de_Name, 11); /* update denode */ 1183 dp->de_fndoffset = to_diroffset; 1184 dp->de_fndcnt = to_count; 1185 error = createde(ip, dp, (struct denode **)0, tcnp); 1186 if (error) { 1187 bcopy(oldname, ip->de_Name, 11); 1188 if (newparent) 1189 VOP_UNLOCK(fdvp, 0, td); 1190 VOP_UNLOCK(fvp, 0, td); 1191 goto bad; 1192 } 1193 ip->de_refcnt++; 1194 zp->de_fndoffset = from_diroffset; 1195 error = removede(zp, ip); 1196 if (error) { 1197 /* XXX should downgrade to ro here, fs is corrupt */ 1198 if (newparent) 1199 VOP_UNLOCK(fdvp, 0, td); 1200 VOP_UNLOCK(fvp, 0, td); 1201 goto bad; 1202 } 1203 if (!doingdirectory) { 1204 error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0, 1205 &ip->de_dirclust, 0); 1206 if (error) { 1207 /* XXX should downgrade to ro here, fs is corrupt */ 1208 if (newparent) 1209 VOP_UNLOCK(fdvp, 0, td); 1210 VOP_UNLOCK(fvp, 0, td); 1211 goto bad; 1212 } 1213 if (ip->de_dirclust == MSDOSFSROOT) 1214 ip->de_diroffset = to_diroffset; 1215 else 1216 ip->de_diroffset = to_diroffset & pmp->pm_crbomask; 1217 } 1218 reinsert(ip); 1219 if (newparent) 1220 VOP_UNLOCK(fdvp, 0, td); 1221 } 1222 1223 /* 1224 * If we moved a directory to a new parent directory, then we must 1225 * fixup the ".." entry in the moved directory. 1226 */ 1227 if (doingdirectory && newparent) { 1228 cn = ip->de_StartCluster; 1229 if (cn == MSDOSFSROOT) { 1230 /* this should never happen */ 1231 panic("msdosfs_rename(): updating .. in root directory?"); 1232 } else 1233 bn = cntobn(pmp, cn); 1234 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, 1235 NOCRED, &bp); 1236 if (error) { 1237 /* XXX should downgrade to ro here, fs is corrupt */ 1238 brelse(bp); 1239 VOP_UNLOCK(fvp, 0, td); 1240 goto bad; 1241 } 1242 dotdotp = (struct direntry *)bp->b_data + 1; 1243 putushort(dotdotp->deStartCluster, dp->de_StartCluster); 1244 if (FAT32(pmp)) 1245 putushort(dotdotp->deHighClust, dp->de_StartCluster >> 16); 1246 error = bwrite(bp); 1247 if (error) { 1248 /* XXX should downgrade to ro here, fs is corrupt */ 1249 VOP_UNLOCK(fvp, 0, td); 1250 goto bad; 1251 } 1252 } 1253 1254 VOP_UNLOCK(fvp, 0, td); 1255 bad: 1256 if (xp) 1257 vput(tvp); 1258 vput(tdvp); 1259 out: 1260 ip->de_flag &= ~DE_RENAME; 1261 vrele(fdvp); 1262 vrele(fvp); 1263 return (error); 1264 1265 } 1266 1267 static struct { 1268 struct direntry dot; 1269 struct direntry dotdot; 1270 } dosdirtemplate = { 1271 { ". ", " ", /* the . entry */ 1272 ATTR_DIRECTORY, /* file attribute */ 1273 0, /* reserved */ 1274 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1275 { 0, 0 }, /* access date */ 1276 { 0, 0 }, /* high bits of start cluster */ 1277 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1278 { 0, 0 }, /* startcluster */ 1279 { 0, 0, 0, 0 } /* filesize */ 1280 }, 1281 { ".. ", " ", /* the .. entry */ 1282 ATTR_DIRECTORY, /* file attribute */ 1283 0, /* reserved */ 1284 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1285 { 0, 0 }, /* access date */ 1286 { 0, 0 }, /* high bits of start cluster */ 1287 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1288 { 0, 0 }, /* startcluster */ 1289 { 0, 0, 0, 0 } /* filesize */ 1290 } 1291 }; 1292 1293 static int 1294 msdosfs_mkdir(ap) 1295 struct vop_mkdir_args /* { 1296 struct vnode *a_dvp; 1297 struvt vnode **a_vpp; 1298 struvt componentname *a_cnp; 1299 struct vattr *a_vap; 1300 } */ *ap; 1301 { 1302 struct componentname *cnp = ap->a_cnp; 1303 struct denode *dep; 1304 struct denode *pdep = VTODE(ap->a_dvp); 1305 struct direntry *denp; 1306 struct msdosfsmount *pmp = pdep->de_pmp; 1307 struct buf *bp; 1308 u_long newcluster, pcl; 1309 int bn; 1310 int error; 1311 struct denode ndirent; 1312 struct timespec ts; 1313 1314 /* 1315 * If this is the root directory and there is no space left we 1316 * can't do anything. This is because the root directory can not 1317 * change size. 1318 */ 1319 if (pdep->de_StartCluster == MSDOSFSROOT 1320 && pdep->de_fndoffset >= pdep->de_FileSize) { 1321 error = ENOSPC; 1322 goto bad2; 1323 } 1324 1325 /* 1326 * Allocate a cluster to hold the about to be created directory. 1327 */ 1328 error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL); 1329 if (error) 1330 goto bad2; 1331 1332 bzero(&ndirent, sizeof(ndirent)); 1333 ndirent.de_pmp = pmp; 1334 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 1335 getnanotime(&ts); 1336 DETIMES(&ndirent, &ts, &ts, &ts); 1337 1338 /* 1339 * Now fill the cluster with the "." and ".." entries. And write 1340 * the cluster to disk. This way it is there for the parent 1341 * directory to be pointing at if there were a crash. 1342 */ 1343 bn = cntobn(pmp, newcluster); 1344 /* always succeeds */ 1345 bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0, 0); 1346 bzero(bp->b_data, pmp->pm_bpcluster); 1347 bcopy(&dosdirtemplate, bp->b_data, sizeof dosdirtemplate); 1348 denp = (struct direntry *)bp->b_data; 1349 putushort(denp[0].deStartCluster, newcluster); 1350 putushort(denp[0].deCDate, ndirent.de_CDate); 1351 putushort(denp[0].deCTime, ndirent.de_CTime); 1352 denp[0].deCHundredth = ndirent.de_CHun; 1353 putushort(denp[0].deADate, ndirent.de_ADate); 1354 putushort(denp[0].deMDate, ndirent.de_MDate); 1355 putushort(denp[0].deMTime, ndirent.de_MTime); 1356 pcl = pdep->de_StartCluster; 1357 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1358 pcl = 0; 1359 putushort(denp[1].deStartCluster, pcl); 1360 putushort(denp[1].deCDate, ndirent.de_CDate); 1361 putushort(denp[1].deCTime, ndirent.de_CTime); 1362 denp[1].deCHundredth = ndirent.de_CHun; 1363 putushort(denp[1].deADate, ndirent.de_ADate); 1364 putushort(denp[1].deMDate, ndirent.de_MDate); 1365 putushort(denp[1].deMTime, ndirent.de_MTime); 1366 if (FAT32(pmp)) { 1367 putushort(denp[0].deHighClust, newcluster >> 16); 1368 putushort(denp[1].deHighClust, pdep->de_StartCluster >> 16); 1369 } 1370 1371 error = bwrite(bp); 1372 if (error) 1373 goto bad; 1374 1375 /* 1376 * Now build up a directory entry pointing to the newly allocated 1377 * cluster. This will be written to an empty slot in the parent 1378 * directory. 1379 */ 1380 #ifdef DIAGNOSTIC 1381 if ((cnp->cn_flags & HASBUF) == 0) 1382 panic("msdosfs_mkdir: no name"); 1383 #endif 1384 error = uniqdosname(pdep, cnp, ndirent.de_Name); 1385 if (error) 1386 goto bad; 1387 1388 ndirent.de_Attributes = ATTR_DIRECTORY; 1389 ndirent.de_LowerCase = 0; 1390 ndirent.de_StartCluster = newcluster; 1391 ndirent.de_FileSize = 0; 1392 ndirent.de_dev = pdep->de_dev; 1393 error = createde(&ndirent, pdep, &dep, cnp); 1394 if (error) 1395 goto bad; 1396 *ap->a_vpp = DETOV(dep); 1397 return (0); 1398 1399 bad: 1400 clusterfree(pmp, newcluster, NULL); 1401 bad2: 1402 return (error); 1403 } 1404 1405 static int 1406 msdosfs_rmdir(ap) 1407 struct vop_rmdir_args /* { 1408 struct vnode *a_dvp; 1409 struct vnode *a_vp; 1410 struct componentname *a_cnp; 1411 } */ *ap; 1412 { 1413 struct vnode *vp = ap->a_vp; 1414 struct vnode *dvp = ap->a_dvp; 1415 struct componentname *cnp = ap->a_cnp; 1416 struct denode *ip, *dp; 1417 struct thread *td = cnp->cn_thread; 1418 int error; 1419 1420 ip = VTODE(vp); 1421 dp = VTODE(dvp); 1422 1423 /* 1424 * Verify the directory is empty (and valid). 1425 * (Rmdir ".." won't be valid since 1426 * ".." will contain a reference to 1427 * the current directory and thus be 1428 * non-empty.) 1429 */ 1430 error = 0; 1431 if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) { 1432 error = ENOTEMPTY; 1433 goto out; 1434 } 1435 /* 1436 * Delete the entry from the directory. For dos filesystems this 1437 * gets rid of the directory entry on disk, the in memory copy 1438 * still exists but the de_refcnt is <= 0. This prevents it from 1439 * being found by deget(). When the vput() on dep is done we give 1440 * up access and eventually msdosfs_reclaim() will be called which 1441 * will remove it from the denode cache. 1442 */ 1443 error = removede(dp, ip); 1444 if (error) 1445 goto out; 1446 /* 1447 * This is where we decrement the link count in the parent 1448 * directory. Since dos filesystems don't do this we just purge 1449 * the name cache. 1450 */ 1451 cache_purge(dvp); 1452 VOP_UNLOCK(dvp, 0, td); 1453 /* 1454 * Truncate the directory that is being deleted. 1455 */ 1456 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred, td); 1457 cache_purge(vp); 1458 1459 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td); 1460 out: 1461 return (error); 1462 } 1463 1464 /* 1465 * DOS filesystems don't know what symlinks are. 1466 */ 1467 static int 1468 msdosfs_symlink(ap) 1469 struct vop_symlink_args /* { 1470 struct vnode *a_dvp; 1471 struct vnode **a_vpp; 1472 struct componentname *a_cnp; 1473 struct vattr *a_vap; 1474 char *a_target; 1475 } */ *ap; 1476 { 1477 return (EOPNOTSUPP); 1478 } 1479 1480 static int 1481 msdosfs_readdir(ap) 1482 struct vop_readdir_args /* { 1483 struct vnode *a_vp; 1484 struct uio *a_uio; 1485 struct ucred *a_cred; 1486 int *a_eofflag; 1487 int *a_ncookies; 1488 u_long **a_cookies; 1489 } */ *ap; 1490 { 1491 int error = 0; 1492 int diff; 1493 long n; 1494 int blsize; 1495 long on; 1496 u_long cn; 1497 uint64_t fileno; 1498 u_long dirsperblk; 1499 long bias = 0; 1500 daddr_t bn, lbn; 1501 struct buf *bp; 1502 struct denode *dep = VTODE(ap->a_vp); 1503 struct msdosfsmount *pmp = dep->de_pmp; 1504 struct direntry *dentp; 1505 struct dirent dirbuf; 1506 struct uio *uio = ap->a_uio; 1507 u_long *cookies = NULL; 1508 int ncookies = 0; 1509 off_t offset, off; 1510 int chksum = -1; 1511 1512 #ifdef MSDOSFS_DEBUG 1513 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n", 1514 ap->a_vp, uio, ap->a_cred, ap->a_eofflag); 1515 #endif 1516 1517 /* 1518 * msdosfs_readdir() won't operate properly on regular files since 1519 * it does i/o only with the the filesystem vnode, and hence can 1520 * retrieve the wrong block from the buffer cache for a plain file. 1521 * So, fail attempts to readdir() on a plain file. 1522 */ 1523 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) 1524 return (ENOTDIR); 1525 1526 /* 1527 * To be safe, initialize dirbuf 1528 */ 1529 bzero(dirbuf.d_name, sizeof(dirbuf.d_name)); 1530 1531 /* 1532 * If the user buffer is smaller than the size of one dos directory 1533 * entry or the file offset is not a multiple of the size of a 1534 * directory entry, then we fail the read. 1535 */ 1536 off = offset = uio->uio_offset; 1537 if (uio->uio_resid < sizeof(struct direntry) || 1538 (offset & (sizeof(struct direntry) - 1))) 1539 return (EINVAL); 1540 1541 if (ap->a_ncookies) { 1542 ncookies = uio->uio_resid / 16; 1543 MALLOC(cookies, u_long *, ncookies * sizeof(u_long), M_TEMP, 1544 M_WAITOK); 1545 *ap->a_cookies = cookies; 1546 *ap->a_ncookies = ncookies; 1547 } 1548 1549 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 1550 1551 /* 1552 * If they are reading from the root directory then, we simulate 1553 * the . and .. entries since these don't exist in the root 1554 * directory. We also set the offset bias to make up for having to 1555 * simulate these entries. By this I mean that at file offset 64 we 1556 * read the first entry in the root directory that lives on disk. 1557 */ 1558 if (dep->de_StartCluster == MSDOSFSROOT 1559 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) { 1560 #if 0 1561 printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n", 1562 offset); 1563 #endif 1564 bias = 2 * sizeof(struct direntry); 1565 if (offset < bias) { 1566 for (n = (int)offset / sizeof(struct direntry); 1567 n < 2; n++) { 1568 if (FAT32(pmp)) 1569 fileno = (uint64_t)cntobn(pmp, 1570 pmp->pm_rootdirblk) 1571 * dirsperblk; 1572 else 1573 fileno = 1; 1574 if (pmp->pm_flags & MSDOSFS_LARGEFS) { 1575 dirbuf.d_fileno = 1576 msdosfs_fileno_map(pmp->pm_mountp, 1577 fileno); 1578 } else { 1579 1580 dirbuf.d_fileno = (uint32_t)fileno; 1581 } 1582 dirbuf.d_type = DT_DIR; 1583 switch (n) { 1584 case 0: 1585 dirbuf.d_namlen = 1; 1586 strcpy(dirbuf.d_name, "."); 1587 break; 1588 case 1: 1589 dirbuf.d_namlen = 2; 1590 strcpy(dirbuf.d_name, ".."); 1591 break; 1592 } 1593 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1594 if (uio->uio_resid < dirbuf.d_reclen) 1595 goto out; 1596 error = uiomove(&dirbuf, dirbuf.d_reclen, uio); 1597 if (error) 1598 goto out; 1599 offset += sizeof(struct direntry); 1600 off = offset; 1601 if (cookies) { 1602 *cookies++ = offset; 1603 if (--ncookies <= 0) 1604 goto out; 1605 } 1606 } 1607 } 1608 } 1609 1610 mbnambuf_init(); 1611 off = offset; 1612 while (uio->uio_resid > 0) { 1613 lbn = de_cluster(pmp, offset - bias); 1614 on = (offset - bias) & pmp->pm_crbomask; 1615 n = min(pmp->pm_bpcluster - on, uio->uio_resid); 1616 diff = dep->de_FileSize - (offset - bias); 1617 if (diff <= 0) 1618 break; 1619 n = min(n, diff); 1620 error = pcbmap(dep, lbn, &bn, &cn, &blsize); 1621 if (error) 1622 break; 1623 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp); 1624 if (error) { 1625 brelse(bp); 1626 return (error); 1627 } 1628 n = min(n, blsize - bp->b_resid); 1629 if (n == 0) { 1630 brelse(bp); 1631 return (EIO); 1632 } 1633 1634 /* 1635 * Convert from dos directory entries to fs-independent 1636 * directory entries. 1637 */ 1638 for (dentp = (struct direntry *)(bp->b_data + on); 1639 (char *)dentp < bp->b_data + on + n; 1640 dentp++, offset += sizeof(struct direntry)) { 1641 #if 0 1642 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n", 1643 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes); 1644 #endif 1645 /* 1646 * If this is an unused entry, we can stop. 1647 */ 1648 if (dentp->deName[0] == SLOT_EMPTY) { 1649 brelse(bp); 1650 goto out; 1651 } 1652 /* 1653 * Skip deleted entries. 1654 */ 1655 if (dentp->deName[0] == SLOT_DELETED) { 1656 chksum = -1; 1657 mbnambuf_init(); 1658 continue; 1659 } 1660 1661 /* 1662 * Handle Win95 long directory entries 1663 */ 1664 if (dentp->deAttributes == ATTR_WIN95) { 1665 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) 1666 continue; 1667 chksum = win2unixfn((struct winentry *)dentp, 1668 chksum, pmp); 1669 continue; 1670 } 1671 1672 /* 1673 * Skip volume labels 1674 */ 1675 if (dentp->deAttributes & ATTR_VOLUME) { 1676 chksum = -1; 1677 mbnambuf_init(); 1678 continue; 1679 } 1680 /* 1681 * This computation of d_fileno must match 1682 * the computation of va_fileid in 1683 * msdosfs_getattr. 1684 */ 1685 if (dentp->deAttributes & ATTR_DIRECTORY) { 1686 fileno = getushort(dentp->deStartCluster); 1687 if (FAT32(pmp)) 1688 fileno |= getushort(dentp->deHighClust) << 16; 1689 /* if this is the root directory */ 1690 if (fileno == MSDOSFSROOT) 1691 if (FAT32(pmp)) 1692 fileno = (uint64_t)cntobn(pmp, 1693 pmp->pm_rootdirblk) 1694 * dirsperblk; 1695 else 1696 fileno = 1; 1697 else 1698 fileno = (uint64_t)cntobn(pmp, fileno) * 1699 dirsperblk; 1700 dirbuf.d_type = DT_DIR; 1701 } else { 1702 fileno = (uint64_t)offset / sizeof(struct direntry); 1703 dirbuf.d_type = DT_REG; 1704 } 1705 if (pmp->pm_flags & MSDOSFS_LARGEFS) { 1706 dirbuf.d_fileno = 1707 msdosfs_fileno_map(pmp->pm_mountp, fileno); 1708 } else 1709 dirbuf.d_fileno = (uint32_t)fileno; 1710 1711 if (chksum != winChksum(dentp)) { 1712 dirbuf.d_namlen = dos2unixfn(dentp->deName, 1713 (u_char *)dirbuf.d_name, 1714 dentp->deLowerCase | 1715 ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ? 1716 (LCASE_BASE | LCASE_EXT) : 0), 1717 pmp); 1718 mbnambuf_init(); 1719 } else 1720 mbnambuf_flush(&dirbuf); 1721 chksum = -1; 1722 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1723 if (uio->uio_resid < dirbuf.d_reclen) { 1724 brelse(bp); 1725 goto out; 1726 } 1727 error = uiomove(&dirbuf, dirbuf.d_reclen, uio); 1728 if (error) { 1729 brelse(bp); 1730 goto out; 1731 } 1732 if (cookies) { 1733 *cookies++ = offset + sizeof(struct direntry); 1734 if (--ncookies <= 0) { 1735 brelse(bp); 1736 goto out; 1737 } 1738 } 1739 off = offset + sizeof(struct direntry); 1740 } 1741 brelse(bp); 1742 } 1743 out: 1744 /* Subtract unused cookies */ 1745 if (ap->a_ncookies) 1746 *ap->a_ncookies -= ncookies; 1747 1748 uio->uio_offset = off; 1749 1750 /* 1751 * Set the eofflag (NFS uses it) 1752 */ 1753 if (ap->a_eofflag) { 1754 if (dep->de_FileSize - (offset - bias) <= 0) 1755 *ap->a_eofflag = 1; 1756 else 1757 *ap->a_eofflag = 0; 1758 } 1759 return (error); 1760 } 1761 1762 /* 1763 * vp - address of vnode file the file 1764 * bn - which cluster we are interested in mapping to a filesystem block number. 1765 * vpp - returns the vnode for the block special file holding the filesystem 1766 * containing the file of interest 1767 * bnp - address of where to return the filesystem relative block number 1768 */ 1769 static int 1770 msdosfs_bmap(ap) 1771 struct vop_bmap_args /* { 1772 struct vnode *a_vp; 1773 daddr_t a_bn; 1774 struct bufobj **a_bop; 1775 daddr_t *a_bnp; 1776 int *a_runp; 1777 int *a_runb; 1778 } */ *ap; 1779 { 1780 struct denode *dep = VTODE(ap->a_vp); 1781 daddr_t blkno; 1782 int error; 1783 1784 if (ap->a_bop != NULL) 1785 *ap->a_bop = &dep->de_pmp->pm_devvp->v_bufobj; 1786 if (ap->a_bnp == NULL) 1787 return (0); 1788 if (ap->a_runp) { 1789 /* 1790 * Sequential clusters should be counted here. 1791 */ 1792 *ap->a_runp = 0; 1793 } 1794 if (ap->a_runb) { 1795 *ap->a_runb = 0; 1796 } 1797 error = pcbmap(dep, ap->a_bn, &blkno, 0, 0); 1798 *ap->a_bnp = blkno; 1799 return (error); 1800 } 1801 1802 static int 1803 msdosfs_strategy(ap) 1804 struct vop_strategy_args /* { 1805 struct vnode *a_vp; 1806 struct buf *a_bp; 1807 } */ *ap; 1808 { 1809 struct buf *bp = ap->a_bp; 1810 struct denode *dep = VTODE(ap->a_vp); 1811 struct bufobj *bo; 1812 int error = 0; 1813 daddr_t blkno; 1814 1815 /* 1816 * If we don't already know the filesystem relative block number 1817 * then get it using pcbmap(). If pcbmap() returns the block 1818 * number as -1 then we've got a hole in the file. DOS filesystems 1819 * don't allow files with holes, so we shouldn't ever see this. 1820 */ 1821 if (bp->b_blkno == bp->b_lblkno) { 1822 error = pcbmap(dep, bp->b_lblkno, &blkno, 0, 0); 1823 bp->b_blkno = blkno; 1824 if (error) { 1825 bp->b_error = error; 1826 bp->b_ioflags |= BIO_ERROR; 1827 bufdone(bp); 1828 return (error); 1829 } 1830 if ((long)bp->b_blkno == -1) 1831 vfs_bio_clrbuf(bp); 1832 } 1833 if (bp->b_blkno == -1) { 1834 bufdone(bp); 1835 return (0); 1836 } 1837 /* 1838 * Read/write the block from/to the disk that contains the desired 1839 * file block. 1840 */ 1841 bp->b_iooffset = dbtob(bp->b_blkno); 1842 bo = dep->de_pmp->pm_bo; 1843 BO_STRATEGY(bo, bp); 1844 return (0); 1845 } 1846 1847 static int 1848 msdosfs_print(ap) 1849 struct vop_print_args /* { 1850 struct vnode *vp; 1851 } */ *ap; 1852 { 1853 struct denode *dep = VTODE(ap->a_vp); 1854 1855 printf("\tstartcluster %lu, dircluster %lu, diroffset %lu, ", 1856 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset); 1857 printf("on dev %s\n", devtoname(dep->de_dev)); 1858 return (0); 1859 } 1860 1861 static int 1862 msdosfs_pathconf(ap) 1863 struct vop_pathconf_args /* { 1864 struct vnode *a_vp; 1865 int a_name; 1866 int *a_retval; 1867 } */ *ap; 1868 { 1869 struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp; 1870 1871 switch (ap->a_name) { 1872 case _PC_LINK_MAX: 1873 *ap->a_retval = 1; 1874 return (0); 1875 case _PC_NAME_MAX: 1876 *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12; 1877 return (0); 1878 case _PC_PATH_MAX: 1879 *ap->a_retval = PATH_MAX; 1880 return (0); 1881 case _PC_CHOWN_RESTRICTED: 1882 *ap->a_retval = 1; 1883 return (0); 1884 case _PC_NO_TRUNC: 1885 *ap->a_retval = 0; 1886 return (0); 1887 default: 1888 return (EINVAL); 1889 } 1890 /* NOTREACHED */ 1891 } 1892 1893 static int 1894 msdosfs_advlock(ap) 1895 struct vop_advlock_args /* { 1896 struct vnode *a_vp; 1897 u_char a_id; 1898 int a_op; 1899 struct flock *a_fl; 1900 int a_flags; 1901 } */ *ap; 1902 { 1903 struct denode *dep = VTODE(ap->a_vp); 1904 1905 return (lf_advlock(ap, &dep->de_lockf, dep->de_FileSize)); 1906 } 1907 1908 static int 1909 msdosfs_vptofh(ap) 1910 struct vop_vptofh_args /* { 1911 struct vnode *a_vp; 1912 struct fid *a_fhp; 1913 } */ *ap; 1914 { 1915 struct denode *dep; 1916 struct defid *defhp; 1917 1918 dep = VTODE(ap->a_vp); 1919 defhp = (struct defid *)ap->a_fhp; 1920 defhp->defid_len = sizeof(struct defid); 1921 defhp->defid_dirclust = dep->de_dirclust; 1922 defhp->defid_dirofs = dep->de_diroffset; 1923 /* defhp->defid_gen = dep->de_gen; */ 1924 return (0); 1925 } 1926 1927 /* Global vfs data structures for msdosfs */ 1928 struct vop_vector msdosfs_vnodeops = { 1929 .vop_default = &default_vnodeops, 1930 1931 .vop_access = msdosfs_access, 1932 .vop_advlock = msdosfs_advlock, 1933 .vop_bmap = msdosfs_bmap, 1934 .vop_cachedlookup = msdosfs_lookup, 1935 .vop_open = msdosfs_open, 1936 .vop_close = msdosfs_close, 1937 .vop_create = msdosfs_create, 1938 .vop_fsync = msdosfs_fsync, 1939 .vop_getattr = msdosfs_getattr, 1940 .vop_inactive = msdosfs_inactive, 1941 .vop_link = msdosfs_link, 1942 .vop_lookup = vfs_cache_lookup, 1943 .vop_mkdir = msdosfs_mkdir, 1944 .vop_mknod = msdosfs_mknod, 1945 .vop_pathconf = msdosfs_pathconf, 1946 .vop_print = msdosfs_print, 1947 .vop_read = msdosfs_read, 1948 .vop_readdir = msdosfs_readdir, 1949 .vop_reclaim = msdosfs_reclaim, 1950 .vop_remove = msdosfs_remove, 1951 .vop_rename = msdosfs_rename, 1952 .vop_rmdir = msdosfs_rmdir, 1953 .vop_setattr = msdosfs_setattr, 1954 .vop_strategy = msdosfs_strategy, 1955 .vop_symlink = msdosfs_symlink, 1956 .vop_write = msdosfs_write, 1957 .vop_vptofh = msdosfs_vptofh, 1958 }; 1959