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sys/fs/msdosfs/msdosfs_vnops.c
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1 /* $FreeBSD$ */ 2 /* $NetBSD: msdosfs_vnops.c,v 1.68 1998/02/10 14:10:04 mrg Exp $ */ 3 4 /*- 5 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. 6 * Copyright (C) 1994, 1995, 1997 TooLs GmbH. 7 * All rights reserved. 8 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by TooLs GmbH. 21 * 4. The name of TooLs GmbH may not be used to endorse or promote products 22 * derived from this software without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 27 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 29 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 30 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 31 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 32 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 33 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 /*- 36 * Written by Paul Popelka (paulp@uts.amdahl.com) 37 * 38 * You can do anything you want with this software, just don't say you wrote 39 * it, and don't remove this notice. 40 * 41 * This software is provided "as is". 42 * 43 * The author supplies this software to be publicly redistributed on the 44 * understanding that the author is not responsible for the correct 45 * functioning of this software in any circumstances and is not liable for 46 * any damages caused by this software. 47 * 48 * October 1992 49 */ 50 51 #include <sys/param.h> 52 #include <sys/systm.h> 53 #include <sys/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/buf.h> 61 #include <sys/proc.h> 62 #include <sys/mount.h> 63 #include <sys/unistd.h> 64 #include <sys/vnode.h> 65 #include <sys/malloc.h> 66 #include <sys/dirent.h> 67 #include <sys/signalvar.h> 68 69 #include <vm/vm.h> 70 #include <vm/vm_extern.h> 71 #include <vm/vnode_pager.h> 72 73 #include <machine/mutex.h> 74 75 #include <fs/msdosfs/bpb.h> 76 #include <fs/msdosfs/msdosfsmount.h> 77 #include <fs/msdosfs/direntry.h> 78 #include <fs/msdosfs/denode.h> 79 #include <fs/msdosfs/fat.h> 80 81 #define DOS_FILESIZE_MAX 0xffffffff 82 83 /* 84 * Prototypes for MSDOSFS vnode operations 85 */ 86 static vop_advlock_t msdosfs_advlock; 87 static vop_advlockasync_t msdosfs_advlockasync; 88 static vop_create_t msdosfs_create; 89 static vop_mknod_t msdosfs_mknod; 90 static vop_open_t msdosfs_open; 91 static vop_close_t msdosfs_close; 92 static vop_access_t msdosfs_access; 93 static vop_getattr_t msdosfs_getattr; 94 static vop_setattr_t msdosfs_setattr; 95 static vop_read_t msdosfs_read; 96 static vop_write_t msdosfs_write; 97 static vop_fsync_t msdosfs_fsync; 98 static vop_remove_t msdosfs_remove; 99 static vop_link_t msdosfs_link; 100 static vop_rename_t msdosfs_rename; 101 static vop_mkdir_t msdosfs_mkdir; 102 static vop_rmdir_t msdosfs_rmdir; 103 static vop_symlink_t msdosfs_symlink; 104 static vop_readdir_t msdosfs_readdir; 105 static vop_bmap_t msdosfs_bmap; 106 static vop_strategy_t msdosfs_strategy; 107 static vop_print_t msdosfs_print; 108 static vop_pathconf_t msdosfs_pathconf; 109 110 /* 111 * Some general notes: 112 * 113 * In the ufs filesystem the inodes, superblocks, and indirect blocks are 114 * read/written using the vnode for the filesystem. Blocks that represent 115 * the contents of a file are read/written using the vnode for the file 116 * (including directories when they are read/written as files). This 117 * presents problems for the dos filesystem because data that should be in 118 * an inode (if dos had them) resides in the directory itself. Since we 119 * must update directory entries without the benefit of having the vnode 120 * for the directory we must use the vnode for the filesystem. This means 121 * that when a directory is actually read/written (via read, write, or 122 * readdir, or seek) we must use the vnode for the filesystem instead of 123 * the vnode for the directory as would happen in ufs. This is to insure we 124 * retreive the correct block from the buffer cache since the hash value is 125 * based upon the vnode address and the desired block number. 126 */ 127 128 /* 129 * Create a regular file. On entry the directory to contain the file being 130 * created is locked. We must release before we return. We must also free 131 * the pathname buffer pointed at by cnp->cn_pnbuf, always on error, or 132 * only if the SAVESTART bit in cn_flags is clear on success. 133 */ 134 static int 135 msdosfs_create(ap) 136 struct vop_create_args /* { 137 struct vnode *a_dvp; 138 struct vnode **a_vpp; 139 struct componentname *a_cnp; 140 struct vattr *a_vap; 141 } */ *ap; 142 { 143 struct componentname *cnp = ap->a_cnp; 144 struct denode ndirent; 145 struct denode *dep; 146 struct denode *pdep = VTODE(ap->a_dvp); 147 struct timespec ts; 148 int error; 149 150 #ifdef MSDOSFS_DEBUG 151 printf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap); 152 #endif 153 154 /* 155 * If this is the root directory and there is no space left we 156 * can't do anything. This is because the root directory can not 157 * change size. 158 */ 159 if (pdep->de_StartCluster == MSDOSFSROOT 160 && pdep->de_fndoffset >= pdep->de_FileSize) { 161 error = ENOSPC; 162 goto bad; 163 } 164 165 /* 166 * Create a directory entry for the file, then call createde() to 167 * have it installed. NOTE: DOS files are always executable. We 168 * use the absence of the owner write bit to make the file 169 * readonly. 170 */ 171 #ifdef DIAGNOSTIC 172 if ((cnp->cn_flags & HASBUF) == 0) 173 panic("msdosfs_create: no name"); 174 #endif 175 bzero(&ndirent, sizeof(ndirent)); 176 error = uniqdosname(pdep, cnp, ndirent.de_Name); 177 if (error) 178 goto bad; 179 180 ndirent.de_Attributes = (ap->a_vap->va_mode & VWRITE) ? 181 ATTR_ARCHIVE : ATTR_ARCHIVE | ATTR_READONLY; 182 ndirent.de_LowerCase = 0; 183 ndirent.de_StartCluster = 0; 184 ndirent.de_FileSize = 0; 185 ndirent.de_dev = pdep->de_dev; 186 ndirent.de_pmp = pdep->de_pmp; 187 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 188 getnanotime(&ts); 189 DETIMES(&ndirent, &ts, &ts, &ts); 190 error = createde(&ndirent, pdep, &dep, cnp); 191 if (error) 192 goto bad; 193 *ap->a_vpp = DETOV(dep); 194 return (0); 195 196 bad: 197 return (error); 198 } 199 200 static int 201 msdosfs_mknod(ap) 202 struct vop_mknod_args /* { 203 struct vnode *a_dvp; 204 struct vnode **a_vpp; 205 struct componentname *a_cnp; 206 struct vattr *a_vap; 207 } */ *ap; 208 { 209 return (EINVAL); 210 } 211 212 static int 213 msdosfs_open(ap) 214 struct vop_open_args /* { 215 struct vnode *a_vp; 216 int a_mode; 217 struct ucred *a_cred; 218 struct thread *a_td; 219 int a_fdidx; 220 } */ *ap; 221 { 222 struct denode *dep = VTODE(ap->a_vp); 223 vnode_create_vobject_off(ap->a_vp, dep->de_FileSize, ap->a_td); 224 return 0; 225 } 226 227 static int 228 msdosfs_close(ap) 229 struct vop_close_args /* { 230 struct vnode *a_vp; 231 int a_fflag; 232 struct ucred *a_cred; 233 struct thread *a_td; 234 } */ *ap; 235 { 236 struct vnode *vp = ap->a_vp; 237 struct denode *dep = VTODE(vp); 238 struct timespec ts; 239 240 VI_LOCK(vp); 241 if (vp->v_usecount > 1) { 242 getnanotime(&ts); 243 DETIMES(dep, &ts, &ts, &ts); 244 } 245 VI_UNLOCK(vp); 246 return 0; 247 } 248 249 static int 250 msdosfs_access(ap) 251 struct vop_access_args /* { 252 struct vnode *a_vp; 253 int a_mode; 254 struct ucred *a_cred; 255 struct thread *a_td; 256 } */ *ap; 257 { 258 struct vnode *vp = ap->a_vp; 259 struct denode *dep = VTODE(ap->a_vp); 260 struct msdosfsmount *pmp = dep->de_pmp; 261 mode_t file_mode, mode = ap->a_mode; 262 263 file_mode = (S_IXUSR|S_IXGRP|S_IXOTH) | (S_IRUSR|S_IRGRP|S_IROTH) | 264 ((dep->de_Attributes & ATTR_READONLY) ? 0 : (S_IWUSR|S_IWGRP|S_IWOTH)); 265 file_mode &= (vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); 266 267 /* 268 * Disallow write attempts on read-only filesystems; 269 * unless the file is a socket, fifo, or a block or 270 * character device resident on the filesystem. 271 */ 272 if (mode & VWRITE) { 273 switch (vp->v_type) { 274 case VDIR: 275 case VLNK: 276 case VREG: 277 if (vp->v_mount->mnt_flag & MNT_RDONLY) 278 return (EROFS); 279 break; 280 default: 281 break; 282 } 283 } 284 285 return (vaccess(vp->v_type, file_mode, pmp->pm_uid, pmp->pm_gid, 286 ap->a_mode, ap->a_cred, NULL)); 287 } 288 289 static int 290 msdosfs_getattr(ap) 291 struct vop_getattr_args /* { 292 struct vnode *a_vp; 293 struct vattr *a_vap; 294 struct ucred *a_cred; 295 struct thread *a_td; 296 } */ *ap; 297 { 298 struct denode *dep = VTODE(ap->a_vp); 299 struct msdosfsmount *pmp = dep->de_pmp; 300 struct vattr *vap = ap->a_vap; 301 mode_t mode; 302 struct timespec ts; 303 u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 304 uint64_t fileid; 305 306 getnanotime(&ts); 307 DETIMES(dep, &ts, &ts, &ts); 308 vap->va_fsid = dev2udev(dep->de_dev); 309 /* 310 * The following computation of the fileid must be the same as that 311 * used in msdosfs_readdir() to compute d_fileno. If not, pwd 312 * doesn't work. 313 */ 314 if (dep->de_Attributes & ATTR_DIRECTORY) { 315 fileid = (uint64_t)cntobn(pmp, dep->de_StartCluster) * 316 dirsperblk; 317 if (dep->de_StartCluster == MSDOSFSROOT) 318 fileid = 1; 319 } else { 320 fileid = (uint64_t)cntobn(pmp, dep->de_dirclust) * 321 dirsperblk; 322 if (dep->de_dirclust == MSDOSFSROOT) 323 fileid = (uint64_t)roottobn(pmp, 0) * dirsperblk; 324 fileid += (uint64_t)dep->de_diroffset / sizeof(struct direntry); 325 } 326 327 if (pmp->pm_flags & MSDOSFS_LARGEFS) 328 vap->va_fileid = msdosfs_fileno_map(pmp->pm_mountp, fileid); 329 else 330 vap->va_fileid = (long)fileid; 331 332 if ((dep->de_Attributes & ATTR_READONLY) == 0) 333 mode = S_IRWXU|S_IRWXG|S_IRWXO; 334 else 335 mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 336 vap->va_mode = mode & 337 (ap->a_vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); 338 vap->va_uid = pmp->pm_uid; 339 vap->va_gid = pmp->pm_gid; 340 vap->va_nlink = 1; 341 vap->va_rdev = 0; 342 vap->va_size = dep->de_FileSize; 343 dos2unixtime(dep->de_MDate, dep->de_MTime, 0, &vap->va_mtime); 344 vap->va_ctime = vap->va_mtime; 345 if (pmp->pm_flags & MSDOSFSMNT_LONGNAME) { 346 dos2unixtime(dep->de_ADate, 0, 0, &vap->va_atime); 347 dos2unixtime(dep->de_CDate, dep->de_CTime, dep->de_CHun, 348 &vap->va_birthtime); 349 } else { 350 vap->va_atime = vap->va_mtime; 351 vap->va_birthtime.tv_sec = -1; 352 vap->va_birthtime.tv_nsec = 0; 353 } 354 vap->va_flags = 0; 355 if ((dep->de_Attributes & ATTR_ARCHIVE) == 0) 356 vap->va_flags |= SF_ARCHIVED; 357 vap->va_gen = 0; 358 vap->va_blocksize = pmp->pm_bpcluster; 359 vap->va_bytes = 360 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask; 361 vap->va_type = ap->a_vp->v_type; 362 vap->va_filerev = dep->de_modrev; 363 return (0); 364 } 365 366 static int 367 msdosfs_setattr(ap) 368 struct vop_setattr_args /* { 369 struct vnode *a_vp; 370 struct vattr *a_vap; 371 struct ucred *a_cred; 372 struct thread *a_td; 373 } */ *ap; 374 { 375 struct vnode *vp = ap->a_vp; 376 struct denode *dep = VTODE(ap->a_vp); 377 struct msdosfsmount *pmp = dep->de_pmp; 378 struct vattr *vap = ap->a_vap; 379 struct ucred *cred = ap->a_cred; 380 int error = 0; 381 382 #ifdef MSDOSFS_DEBUG 383 printf("msdosfs_setattr(): vp %p, vap %p, cred %p, p %p\n", 384 ap->a_vp, vap, cred, ap->a_td); 385 #endif 386 387 /* 388 * Check for unsettable attributes. 389 */ 390 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 391 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 392 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 393 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 394 #ifdef MSDOSFS_DEBUG 395 printf("msdosfs_setattr(): returning EINVAL\n"); 396 printf(" va_type %d, va_nlink %x, va_fsid %lx, va_fileid %lx\n", 397 vap->va_type, vap->va_nlink, vap->va_fsid, vap->va_fileid); 398 printf(" va_blocksize %lx, va_rdev %x, va_bytes %qx, va_gen %lx\n", 399 vap->va_blocksize, vap->va_rdev, vap->va_bytes, vap->va_gen); 400 printf(" va_uid %x, va_gid %x\n", 401 vap->va_uid, vap->va_gid); 402 #endif 403 return (EINVAL); 404 } 405 if (vap->va_flags != VNOVAL) { 406 if (vp->v_mount->mnt_flag & MNT_RDONLY) 407 return (EROFS); 408 if (cred->cr_uid != pmp->pm_uid && 409 (error = suser_cred(cred, SUSER_ALLOWJAIL))) 410 return (error); 411 /* 412 * We are very inconsistent about handling unsupported 413 * attributes. We ignored the access time and the 414 * read and execute bits. We were strict for the other 415 * attributes. 416 * 417 * Here we are strict, stricter than ufs in not allowing 418 * users to attempt to set SF_SETTABLE bits or anyone to 419 * set unsupported bits. However, we ignore attempts to 420 * set ATTR_ARCHIVE for directories `cp -pr' from a more 421 * sensible filesystem attempts it a lot. 422 */ 423 if (suser_cred(cred, SUSER_ALLOWJAIL)) { 424 if (vap->va_flags & SF_SETTABLE) 425 return EPERM; 426 } 427 if (vap->va_flags & ~SF_ARCHIVED) 428 return EOPNOTSUPP; 429 if (vap->va_flags & SF_ARCHIVED) 430 dep->de_Attributes &= ~ATTR_ARCHIVE; 431 else if (!(dep->de_Attributes & ATTR_DIRECTORY)) 432 dep->de_Attributes |= ATTR_ARCHIVE; 433 dep->de_flag |= DE_MODIFIED; 434 } 435 436 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 437 uid_t uid; 438 gid_t gid; 439 440 if (vp->v_mount->mnt_flag & MNT_RDONLY) 441 return (EROFS); 442 uid = vap->va_uid; 443 if (uid == (uid_t)VNOVAL) 444 uid = pmp->pm_uid; 445 gid = vap->va_gid; 446 if (gid == (gid_t)VNOVAL) 447 gid = pmp->pm_gid; 448 if ((cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid || 449 (gid != pmp->pm_gid && !groupmember(gid, cred))) && 450 (error = suser_cred(cred, SUSER_ALLOWJAIL))) 451 return error; 452 if (uid != pmp->pm_uid || gid != pmp->pm_gid) 453 return EINVAL; 454 } 455 456 if (vap->va_size != VNOVAL) { 457 /* 458 * Disallow write attempts on read-only filesystems; 459 * unless the file is a socket, fifo, or a block or 460 * character device resident on the filesystem. 461 */ 462 switch (vp->v_type) { 463 case VDIR: 464 return (EISDIR); 465 /* NOT REACHED */ 466 case VLNK: 467 case VREG: 468 if (vp->v_mount->mnt_flag & MNT_RDONLY) 469 return (EROFS); 470 break; 471 default: 472 break; 473 } 474 error = detrunc(dep, vap->va_size, 0, cred, ap->a_td); 475 if (error) 476 return error; 477 } 478 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 479 if (vp->v_mount->mnt_flag & MNT_RDONLY) 480 return (EROFS); 481 if (cred->cr_uid != pmp->pm_uid && 482 (error = suser_cred(cred, SUSER_ALLOWJAIL)) && 483 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 484 (error = VOP_ACCESS(ap->a_vp, VWRITE, cred, ap->a_td)))) 485 return (error); 486 if (vp->v_type != VDIR) { 487 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 && 488 vap->va_atime.tv_sec != VNOVAL) { 489 dep->de_flag &= ~DE_ACCESS; 490 unix2dostime(&vap->va_atime, &dep->de_ADate, 491 NULL, NULL); 492 } 493 if (vap->va_mtime.tv_sec != VNOVAL) { 494 dep->de_flag &= ~DE_UPDATE; 495 unix2dostime(&vap->va_mtime, &dep->de_MDate, 496 &dep->de_MTime, NULL); 497 } 498 dep->de_Attributes |= ATTR_ARCHIVE; 499 dep->de_flag |= DE_MODIFIED; 500 } 501 } 502 /* 503 * DOS files only have the ability to have their writability 504 * attribute set, so we use the owner write bit to set the readonly 505 * attribute. 506 */ 507 if (vap->va_mode != (mode_t)VNOVAL) { 508 if (vp->v_mount->mnt_flag & MNT_RDONLY) 509 return (EROFS); 510 if (cred->cr_uid != pmp->pm_uid && 511 (error = suser_cred(cred, SUSER_ALLOWJAIL))) 512 return (error); 513 if (vp->v_type != VDIR) { 514 /* We ignore the read and execute bits. */ 515 if (vap->va_mode & VWRITE) 516 dep->de_Attributes &= ~ATTR_READONLY; 517 else 518 dep->de_Attributes |= ATTR_READONLY; 519 dep->de_Attributes |= ATTR_ARCHIVE; 520 dep->de_flag |= DE_MODIFIED; 521 } 522 } 523 return (deupdat(dep, 1)); 524 } 525 526 static int 527 msdosfs_read(ap) 528 struct vop_read_args /* { 529 struct vnode *a_vp; 530 struct uio *a_uio; 531 int a_ioflag; 532 struct ucred *a_cred; 533 } */ *ap; 534 { 535 int error = 0; 536 int blsize; 537 int isadir; 538 int orig_resid; 539 u_int n; 540 u_long diff; 541 u_long on; 542 daddr_t lbn; 543 daddr_t rablock; 544 int rasize; 545 int seqcount; 546 struct buf *bp; 547 struct vnode *vp = ap->a_vp; 548 struct denode *dep = VTODE(vp); 549 struct msdosfsmount *pmp = dep->de_pmp; 550 struct uio *uio = ap->a_uio; 551 552 if (uio->uio_offset < 0) 553 return (EINVAL); 554 555 if ((uoff_t)uio->uio_offset > DOS_FILESIZE_MAX) 556 return (0); 557 /* 558 * If they didn't ask for any data, then we are done. 559 */ 560 orig_resid = uio->uio_resid; 561 if (orig_resid <= 0) 562 return (0); 563 564 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 565 566 isadir = dep->de_Attributes & ATTR_DIRECTORY; 567 do { 568 if (uio->uio_offset >= dep->de_FileSize) 569 break; 570 lbn = de_cluster(pmp, uio->uio_offset); 571 /* 572 * If we are operating on a directory file then be sure to 573 * do i/o with the vnode for the filesystem instead of the 574 * vnode for the directory. 575 */ 576 if (isadir) { 577 /* convert cluster # to block # */ 578 error = pcbmap(dep, lbn, &lbn, 0, &blsize); 579 if (error == E2BIG) { 580 error = EINVAL; 581 break; 582 } else if (error) 583 break; 584 error = bread(pmp->pm_devvp, lbn, blsize, NOCRED, &bp); 585 } else { 586 blsize = pmp->pm_bpcluster; 587 rablock = lbn + 1; 588 if (seqcount > 1 && 589 de_cn2off(pmp, rablock) < dep->de_FileSize) { 590 rasize = pmp->pm_bpcluster; 591 error = breadn(vp, lbn, blsize, 592 &rablock, &rasize, 1, NOCRED, &bp); 593 } else { 594 error = bread(vp, lbn, blsize, NOCRED, &bp); 595 } 596 } 597 if (error) { 598 brelse(bp); 599 break; 600 } 601 on = uio->uio_offset & pmp->pm_crbomask; 602 diff = pmp->pm_bpcluster - on; 603 n = diff > uio->uio_resid ? uio->uio_resid : diff; 604 diff = dep->de_FileSize - uio->uio_offset; 605 if (diff < n) 606 n = diff; 607 diff = blsize - bp->b_resid; 608 if (diff < n) 609 n = diff; 610 error = uiomove(bp->b_data + on, (int) n, uio); 611 brelse(bp); 612 } while (error == 0 && uio->uio_resid > 0 && n != 0); 613 if (!isadir && (error == 0 || uio->uio_resid != orig_resid) && 614 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 615 dep->de_flag |= DE_ACCESS; 616 return (error); 617 } 618 619 /* 620 * Write data to a file or directory. 621 */ 622 static int 623 msdosfs_write(ap) 624 struct vop_write_args /* { 625 struct vnode *a_vp; 626 struct uio *a_uio; 627 int a_ioflag; 628 struct ucred *a_cred; 629 } */ *ap; 630 { 631 int n; 632 int croffset; 633 int resid; 634 u_long osize; 635 int error = 0; 636 u_long count; 637 daddr_t bn, lastcn; 638 struct buf *bp; 639 int ioflag = ap->a_ioflag; 640 struct uio *uio = ap->a_uio; 641 struct thread *td = uio->uio_td; 642 struct vnode *vp = ap->a_vp; 643 struct vnode *thisvp; 644 struct denode *dep = VTODE(vp); 645 struct msdosfsmount *pmp = dep->de_pmp; 646 struct ucred *cred = ap->a_cred; 647 648 #ifdef MSDOSFS_DEBUG 649 printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n", 650 vp, uio, ioflag, cred); 651 printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n", 652 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster); 653 #endif 654 655 switch (vp->v_type) { 656 case VREG: 657 if (ioflag & IO_APPEND) 658 uio->uio_offset = dep->de_FileSize; 659 thisvp = vp; 660 break; 661 case VDIR: 662 return EISDIR; 663 default: 664 panic("msdosfs_write(): bad file type"); 665 } 666 667 if (uio->uio_offset < 0) 668 return (EFBIG); 669 670 if (uio->uio_resid == 0) 671 return (0); 672 673 /* 674 * If they've exceeded their filesize limit, tell them about it. 675 */ 676 if (td != NULL) { 677 PROC_LOCK(td->td_proc); 678 if ((uoff_t)uio->uio_offset + uio->uio_resid > 679 lim_cur(td->td_proc, RLIMIT_FSIZE)) { 680 psignal(td->td_proc, SIGXFSZ); 681 PROC_UNLOCK(td->td_proc); 682 return (EFBIG); 683 } 684 PROC_UNLOCK(td->td_proc); 685 } 686 687 if ((uoff_t)uio->uio_offset + uio->uio_resid > DOS_FILESIZE_MAX) 688 return (EFBIG); 689 690 /* 691 * If the offset we are starting the write at is beyond the end of 692 * the file, then they've done a seek. Unix filesystems allow 693 * files with holes in them, DOS doesn't so we must fill the hole 694 * with zeroed blocks. 695 */ 696 if (uio->uio_offset > dep->de_FileSize) { 697 error = deextend(dep, uio->uio_offset, cred); 698 if (error) 699 return (error); 700 } 701 702 /* 703 * Remember some values in case the write fails. 704 */ 705 resid = uio->uio_resid; 706 osize = dep->de_FileSize; 707 708 /* 709 * If we write beyond the end of the file, extend it to its ultimate 710 * size ahead of the time to hopefully get a contiguous area. 711 */ 712 if (uio->uio_offset + resid > osize) { 713 count = de_clcount(pmp, uio->uio_offset + resid) - 714 de_clcount(pmp, osize); 715 error = extendfile(dep, count, NULL, NULL, 0); 716 if (error && (error != ENOSPC || (ioflag & IO_UNIT))) 717 goto errexit; 718 lastcn = dep->de_fc[FC_LASTFC].fc_frcn; 719 } else 720 lastcn = de_clcount(pmp, osize) - 1; 721 722 do { 723 if (de_cluster(pmp, uio->uio_offset) > lastcn) { 724 error = ENOSPC; 725 break; 726 } 727 728 croffset = uio->uio_offset & pmp->pm_crbomask; 729 n = min(uio->uio_resid, pmp->pm_bpcluster - croffset); 730 if (uio->uio_offset + n > dep->de_FileSize) { 731 dep->de_FileSize = uio->uio_offset + n; 732 /* The object size needs to be set before buffer is allocated */ 733 vnode_pager_setsize(vp, dep->de_FileSize); 734 } 735 736 bn = de_cluster(pmp, uio->uio_offset); 737 if ((uio->uio_offset & pmp->pm_crbomask) == 0 738 && (de_cluster(pmp, uio->uio_offset + uio->uio_resid) 739 > de_cluster(pmp, uio->uio_offset) 740 || uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) { 741 /* 742 * If either the whole cluster gets written, 743 * or we write the cluster from its start beyond EOF, 744 * then no need to read data from disk. 745 */ 746 bp = getblk(thisvp, bn, pmp->pm_bpcluster, 0, 0, 0); 747 clrbuf(bp); 748 /* 749 * Do the bmap now, since pcbmap needs buffers 750 * for the fat table. (see msdosfs_strategy) 751 */ 752 if (bp->b_blkno == bp->b_lblkno) { 753 error = pcbmap(dep, bp->b_lblkno, &bn, 0, 0); 754 if (error) 755 bp->b_blkno = -1; 756 else 757 bp->b_blkno = bn; 758 } 759 if (bp->b_blkno == -1) { 760 brelse(bp); 761 if (!error) 762 error = EIO; /* XXX */ 763 break; 764 } 765 } else { 766 /* 767 * The block we need to write into exists, so read it in. 768 */ 769 error = bread(thisvp, bn, pmp->pm_bpcluster, cred, &bp); 770 if (error) { 771 brelse(bp); 772 break; 773 } 774 } 775 776 /* 777 * Should these vnode_pager_* functions be done on dir 778 * files? 779 */ 780 781 /* 782 * Copy the data from user space into the buf header. 783 */ 784 error = uiomove(bp->b_data + croffset, n, uio); 785 if (error) { 786 brelse(bp); 787 break; 788 } 789 790 /* 791 * If they want this synchronous then write it and wait for 792 * it. Otherwise, if on a cluster boundary write it 793 * asynchronously so we can move on to the next block 794 * without delay. Otherwise do a delayed write because we 795 * may want to write somemore into the block later. 796 */ 797 if (ioflag & IO_SYNC) 798 (void) bwrite(bp); 799 else if (n + croffset == pmp->pm_bpcluster) 800 bawrite(bp); 801 else 802 bdwrite(bp); 803 dep->de_flag |= DE_UPDATE; 804 } while (error == 0 && uio->uio_resid > 0); 805 806 /* 807 * If the write failed and they want us to, truncate the file back 808 * to the size it was before the write was attempted. 809 */ 810 errexit: 811 if (error) { 812 if (ioflag & IO_UNIT) { 813 detrunc(dep, osize, ioflag & IO_SYNC, NOCRED, NULL); 814 uio->uio_offset -= resid - uio->uio_resid; 815 uio->uio_resid = resid; 816 } else { 817 detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC, NOCRED, NULL); 818 if (uio->uio_resid != resid) 819 error = 0; 820 } 821 } else if (ioflag & IO_SYNC) 822 error = deupdat(dep, 1); 823 return (error); 824 } 825 826 /* 827 * Flush the blocks of a file to disk. 828 * 829 * This function is worthless for vnodes that represent directories. Maybe we 830 * could just do a sync if they try an fsync on a directory file. 831 */ 832 static int 833 msdosfs_fsync(ap) 834 struct vop_fsync_args /* { 835 struct vnode *a_vp; 836 struct ucred *a_cred; 837 int a_waitfor; 838 struct thread *a_td; 839 } */ *ap; 840 { 841 /* 842 * Flush our dirty buffers. 843 */ 844 vop_stdfsync(ap); 845 846 return (deupdat(VTODE(ap->a_vp), ap->a_waitfor == MNT_WAIT)); 847 } 848 849 static int 850 msdosfs_remove(ap) 851 struct vop_remove_args /* { 852 struct vnode *a_dvp; 853 struct vnode *a_vp; 854 struct componentname *a_cnp; 855 } */ *ap; 856 { 857 struct denode *dep = VTODE(ap->a_vp); 858 struct denode *ddep = VTODE(ap->a_dvp); 859 int error; 860 861 if (ap->a_vp->v_type == VDIR) 862 error = EPERM; 863 else 864 error = removede(ddep, dep); 865 #ifdef MSDOSFS_DEBUG 866 printf("msdosfs_remove(), dep %p, v_usecount %d\n", dep, ap->a_vp->v_usecount); 867 #endif 868 return (error); 869 } 870 871 /* 872 * DOS filesystems don't know what links are. 873 */ 874 static int 875 msdosfs_link(ap) 876 struct vop_link_args /* { 877 struct vnode *a_tdvp; 878 struct vnode *a_vp; 879 struct componentname *a_cnp; 880 } */ *ap; 881 { 882 return (EOPNOTSUPP); 883 } 884 885 /* 886 * Renames on files require moving the denode to a new hash queue since the 887 * denode's location is used to compute which hash queue to put the file 888 * in. Unless it is a rename in place. For example "mv a b". 889 * 890 * What follows is the basic algorithm: 891 * 892 * if (file move) { 893 * if (dest file exists) { 894 * remove dest file 895 * } 896 * if (dest and src in same directory) { 897 * rewrite name in existing directory slot 898 * } else { 899 * write new entry in dest directory 900 * update offset and dirclust in denode 901 * move denode to new hash chain 902 * clear old directory entry 903 * } 904 * } else { 905 * directory move 906 * if (dest directory exists) { 907 * if (dest is not empty) { 908 * return ENOTEMPTY 909 * } 910 * remove dest directory 911 * } 912 * if (dest and src in same directory) { 913 * rewrite name in existing entry 914 * } else { 915 * be sure dest is not a child of src directory 916 * write entry in dest directory 917 * update "." and ".." in moved directory 918 * clear old directory entry for moved directory 919 * } 920 * } 921 * 922 * On entry: 923 * source's parent directory is unlocked 924 * source file or directory is unlocked 925 * destination's parent directory is locked 926 * destination file or directory is locked if it exists 927 * 928 * On exit: 929 * all denodes should be released 930 */ 931 static int 932 msdosfs_rename(ap) 933 struct vop_rename_args /* { 934 struct vnode *a_fdvp; 935 struct vnode *a_fvp; 936 struct componentname *a_fcnp; 937 struct vnode *a_tdvp; 938 struct vnode *a_tvp; 939 struct componentname *a_tcnp; 940 } */ *ap; 941 { 942 struct vnode *tdvp = ap->a_tdvp; 943 struct vnode *fvp = ap->a_fvp; 944 struct vnode *fdvp = ap->a_fdvp; 945 struct vnode *tvp = ap->a_tvp; 946 struct componentname *tcnp = ap->a_tcnp; 947 struct componentname *fcnp = ap->a_fcnp; 948 struct thread *td = fcnp->cn_thread; 949 struct denode *ip, *xp, *dp, *zp; 950 u_char toname[12], oldname[11]; 951 u_long from_diroffset, to_diroffset; 952 u_char to_count; 953 int doingdirectory = 0, newparent = 0; 954 int error; 955 u_long cn; 956 daddr_t bn; 957 struct denode *fddep; /* from file's parent directory */ 958 struct msdosfsmount *pmp; 959 struct direntry *dotdotp; 960 struct buf *bp; 961 962 fddep = VTODE(ap->a_fdvp); 963 pmp = fddep->de_pmp; 964 965 pmp = VFSTOMSDOSFS(fdvp->v_mount); 966 967 #ifdef DIAGNOSTIC 968 if ((tcnp->cn_flags & HASBUF) == 0 || 969 (fcnp->cn_flags & HASBUF) == 0) 970 panic("msdosfs_rename: no name"); 971 #endif 972 /* 973 * Check for cross-device rename. 974 */ 975 if ((fvp->v_mount != tdvp->v_mount) || 976 (tvp && (fvp->v_mount != tvp->v_mount))) { 977 error = EXDEV; 978 abortit: 979 if (tdvp == tvp) 980 vrele(tdvp); 981 else 982 vput(tdvp); 983 if (tvp) 984 vput(tvp); 985 vrele(fdvp); 986 vrele(fvp); 987 return (error); 988 } 989 990 /* 991 * If source and dest are the same, do nothing. 992 */ 993 if (tvp == fvp) { 994 error = 0; 995 goto abortit; 996 } 997 998 error = vn_lock(fvp, LK_EXCLUSIVE, td); 999 if (error) 1000 goto abortit; 1001 dp = VTODE(fdvp); 1002 ip = VTODE(fvp); 1003 1004 /* 1005 * Be sure we are not renaming ".", "..", or an alias of ".". This 1006 * leads to a crippled directory tree. It's pretty tough to do a 1007 * "ls" or "pwd" with the "." directory entry missing, and "cd .." 1008 * doesn't work if the ".." entry is missing. 1009 */ 1010 if (ip->de_Attributes & ATTR_DIRECTORY) { 1011 /* 1012 * Avoid ".", "..", and aliases of "." for obvious reasons. 1013 */ 1014 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 1015 dp == ip || 1016 (fcnp->cn_flags & ISDOTDOT) || 1017 (tcnp->cn_flags & ISDOTDOT) || 1018 (ip->de_flag & DE_RENAME)) { 1019 VOP_UNLOCK(fvp, 0, td); 1020 error = EINVAL; 1021 goto abortit; 1022 } 1023 ip->de_flag |= DE_RENAME; 1024 doingdirectory++; 1025 } 1026 1027 /* 1028 * When the target exists, both the directory 1029 * and target vnodes are returned locked. 1030 */ 1031 dp = VTODE(tdvp); 1032 xp = tvp ? VTODE(tvp) : NULL; 1033 /* 1034 * Remember direntry place to use for destination 1035 */ 1036 to_diroffset = dp->de_fndoffset; 1037 to_count = dp->de_fndcnt; 1038 1039 /* 1040 * If ".." must be changed (ie the directory gets a new 1041 * parent) then the source directory must not be in the 1042 * directory heirarchy above the target, as this would 1043 * orphan everything below the source directory. Also 1044 * the user must have write permission in the source so 1045 * as to be able to change "..". We must repeat the call 1046 * to namei, as the parent directory is unlocked by the 1047 * call to doscheckpath(). 1048 */ 1049 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread); 1050 VOP_UNLOCK(fvp, 0, td); 1051 if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster) 1052 newparent = 1; 1053 if (doingdirectory && newparent) { 1054 if (error) /* write access check above */ 1055 goto bad; 1056 if (xp != NULL) 1057 vput(tvp); 1058 /* 1059 * doscheckpath() vput()'s dp, 1060 * so we have to do a relookup afterwards 1061 */ 1062 error = doscheckpath(ip, dp); 1063 if (error) 1064 goto out; 1065 if ((tcnp->cn_flags & SAVESTART) == 0) 1066 panic("msdosfs_rename: lost to startdir"); 1067 error = relookup(tdvp, &tvp, tcnp); 1068 if (error) 1069 goto out; 1070 dp = VTODE(tdvp); 1071 xp = tvp ? VTODE(tvp) : NULL; 1072 } 1073 1074 if (xp != NULL) { 1075 /* 1076 * Target must be empty if a directory and have no links 1077 * to it. Also, ensure source and target are compatible 1078 * (both directories, or both not directories). 1079 */ 1080 if (xp->de_Attributes & ATTR_DIRECTORY) { 1081 if (!dosdirempty(xp)) { 1082 error = ENOTEMPTY; 1083 goto bad; 1084 } 1085 if (!doingdirectory) { 1086 error = ENOTDIR; 1087 goto bad; 1088 } 1089 cache_purge(tdvp); 1090 } else if (doingdirectory) { 1091 error = EISDIR; 1092 goto bad; 1093 } 1094 error = removede(dp, xp); 1095 if (error) 1096 goto bad; 1097 vput(tvp); 1098 xp = NULL; 1099 } 1100 1101 /* 1102 * Convert the filename in tcnp into a dos filename. We copy this 1103 * into the denode and directory entry for the destination 1104 * file/directory. 1105 */ 1106 error = uniqdosname(VTODE(tdvp), tcnp, toname); 1107 if (error) 1108 goto abortit; 1109 1110 /* 1111 * Since from wasn't locked at various places above, 1112 * have to do a relookup here. 1113 */ 1114 fcnp->cn_flags &= ~MODMASK; 1115 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 1116 if ((fcnp->cn_flags & SAVESTART) == 0) 1117 panic("msdosfs_rename: lost from startdir"); 1118 if (!newparent) 1119 VOP_UNLOCK(tdvp, 0, td); 1120 if (relookup(fdvp, &fvp, fcnp) == 0) 1121 vrele(fdvp); 1122 if (fvp == NULL) { 1123 /* 1124 * From name has disappeared. 1125 */ 1126 if (doingdirectory) 1127 panic("rename: lost dir entry"); 1128 if (newparent) 1129 VOP_UNLOCK(tdvp, 0, td); 1130 vrele(tdvp); 1131 vrele(ap->a_fvp); 1132 return 0; 1133 } 1134 xp = VTODE(fvp); 1135 zp = VTODE(fdvp); 1136 from_diroffset = zp->de_fndoffset; 1137 1138 /* 1139 * Ensure that the directory entry still exists and has not 1140 * changed till now. If the source is a file the entry may 1141 * have been unlinked or renamed. In either case there is 1142 * no further work to be done. If the source is a directory 1143 * then it cannot have been rmdir'ed or renamed; this is 1144 * prohibited by the DE_RENAME flag. 1145 */ 1146 if (xp != ip) { 1147 if (doingdirectory) 1148 panic("rename: lost dir entry"); 1149 VOP_UNLOCK(fvp, 0, td); 1150 if (newparent) 1151 VOP_UNLOCK(fdvp, 0, td); 1152 vrele(ap->a_fvp); 1153 xp = NULL; 1154 } else { 1155 vrele(fvp); 1156 xp = NULL; 1157 1158 /* 1159 * First write a new entry in the destination 1160 * directory and mark the entry in the source directory 1161 * as deleted. Then move the denode to the correct hash 1162 * chain for its new location in the filesystem. And, if 1163 * we moved a directory, then update its .. entry to point 1164 * to the new parent directory. 1165 */ 1166 bcopy(ip->de_Name, oldname, 11); 1167 bcopy(toname, ip->de_Name, 11); /* update denode */ 1168 dp->de_fndoffset = to_diroffset; 1169 dp->de_fndcnt = to_count; 1170 error = createde(ip, dp, (struct denode **)0, tcnp); 1171 if (error) { 1172 bcopy(oldname, ip->de_Name, 11); 1173 if (newparent) 1174 VOP_UNLOCK(fdvp, 0, td); 1175 VOP_UNLOCK(fvp, 0, td); 1176 goto bad; 1177 } 1178 ip->de_refcnt++; 1179 zp->de_fndoffset = from_diroffset; 1180 error = removede(zp, ip); 1181 if (error) { 1182 /* XXX should really panic here, fs is corrupt */ 1183 if (newparent) 1184 VOP_UNLOCK(fdvp, 0, td); 1185 VOP_UNLOCK(fvp, 0, td); 1186 goto bad; 1187 } 1188 if (!doingdirectory) { 1189 error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0, 1190 &ip->de_dirclust, 0); 1191 if (error) { 1192 /* XXX should really panic here, fs is corrupt */ 1193 if (newparent) 1194 VOP_UNLOCK(fdvp, 0, td); 1195 VOP_UNLOCK(fvp, 0, td); 1196 goto bad; 1197 } 1198 if (ip->de_dirclust == MSDOSFSROOT) 1199 ip->de_diroffset = to_diroffset; 1200 else 1201 ip->de_diroffset = to_diroffset & pmp->pm_crbomask; 1202 } 1203 reinsert(ip); 1204 if (newparent) 1205 VOP_UNLOCK(fdvp, 0, td); 1206 } 1207 1208 /* 1209 * If we moved a directory to a new parent directory, then we must 1210 * fixup the ".." entry in the moved directory. 1211 */ 1212 if (doingdirectory && newparent) { 1213 cn = ip->de_StartCluster; 1214 if (cn == MSDOSFSROOT) { 1215 /* this should never happen */ 1216 panic("msdosfs_rename(): updating .. in root directory?"); 1217 } else 1218 bn = cntobn(pmp, cn); 1219 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, 1220 NOCRED, &bp); 1221 if (error) { 1222 /* XXX should really panic here, fs is corrupt */ 1223 brelse(bp); 1224 VOP_UNLOCK(fvp, 0, td); 1225 goto bad; 1226 } 1227 dotdotp = (struct direntry *)bp->b_data + 1; 1228 putushort(dotdotp->deStartCluster, dp->de_StartCluster); 1229 if (FAT32(pmp)) 1230 putushort(dotdotp->deHighClust, dp->de_StartCluster >> 16); 1231 error = bwrite(bp); 1232 if (error) { 1233 /* XXX should really panic here, fs is corrupt */ 1234 VOP_UNLOCK(fvp, 0, td); 1235 goto bad; 1236 } 1237 } 1238 1239 VOP_UNLOCK(fvp, 0, td); 1240 bad: 1241 if (xp) 1242 vput(tvp); 1243 vput(tdvp); 1244 out: 1245 ip->de_flag &= ~DE_RENAME; 1246 vrele(fdvp); 1247 vrele(fvp); 1248 return (error); 1249 1250 } 1251 1252 static struct { 1253 struct direntry dot; 1254 struct direntry dotdot; 1255 } dosdirtemplate = { 1256 { ". ", " ", /* the . entry */ 1257 ATTR_DIRECTORY, /* file attribute */ 1258 0, /* reserved */ 1259 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1260 { 0, 0 }, /* access date */ 1261 { 0, 0 }, /* high bits of start cluster */ 1262 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1263 { 0, 0 }, /* startcluster */ 1264 { 0, 0, 0, 0 } /* filesize */ 1265 }, 1266 { ".. ", " ", /* the .. entry */ 1267 ATTR_DIRECTORY, /* file attribute */ 1268 0, /* reserved */ 1269 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1270 { 0, 0 }, /* access date */ 1271 { 0, 0 }, /* high bits of start cluster */ 1272 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1273 { 0, 0 }, /* startcluster */ 1274 { 0, 0, 0, 0 } /* filesize */ 1275 } 1276 }; 1277 1278 static int 1279 msdosfs_mkdir(ap) 1280 struct vop_mkdir_args /* { 1281 struct vnode *a_dvp; 1282 struvt vnode **a_vpp; 1283 struvt componentname *a_cnp; 1284 struct vattr *a_vap; 1285 } */ *ap; 1286 { 1287 struct componentname *cnp = ap->a_cnp; 1288 struct denode *dep; 1289 struct denode *pdep = VTODE(ap->a_dvp); 1290 struct direntry *denp; 1291 struct msdosfsmount *pmp = pdep->de_pmp; 1292 struct buf *bp; 1293 u_long newcluster, pcl; 1294 int bn; 1295 int error; 1296 struct denode ndirent; 1297 struct timespec ts; 1298 1299 /* 1300 * If this is the root directory and there is no space left we 1301 * can't do anything. This is because the root directory can not 1302 * change size. 1303 */ 1304 if (pdep->de_StartCluster == MSDOSFSROOT 1305 && pdep->de_fndoffset >= pdep->de_FileSize) { 1306 error = ENOSPC; 1307 goto bad2; 1308 } 1309 1310 /* 1311 * Allocate a cluster to hold the about to be created directory. 1312 */ 1313 error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL); 1314 if (error) 1315 goto bad2; 1316 1317 bzero(&ndirent, sizeof(ndirent)); 1318 ndirent.de_pmp = pmp; 1319 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 1320 getnanotime(&ts); 1321 DETIMES(&ndirent, &ts, &ts, &ts); 1322 1323 /* 1324 * Now fill the cluster with the "." and ".." entries. And write 1325 * the cluster to disk. This way it is there for the parent 1326 * directory to be pointing at if there were a crash. 1327 */ 1328 bn = cntobn(pmp, newcluster); 1329 /* always succeeds */ 1330 bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0, 0); 1331 bzero(bp->b_data, pmp->pm_bpcluster); 1332 bcopy(&dosdirtemplate, bp->b_data, sizeof dosdirtemplate); 1333 denp = (struct direntry *)bp->b_data; 1334 putushort(denp[0].deStartCluster, newcluster); 1335 putushort(denp[0].deCDate, ndirent.de_CDate); 1336 putushort(denp[0].deCTime, ndirent.de_CTime); 1337 denp[0].deCHundredth = ndirent.de_CHun; 1338 putushort(denp[0].deADate, ndirent.de_ADate); 1339 putushort(denp[0].deMDate, ndirent.de_MDate); 1340 putushort(denp[0].deMTime, ndirent.de_MTime); 1341 pcl = pdep->de_StartCluster; 1342 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1343 pcl = 0; 1344 putushort(denp[1].deStartCluster, pcl); 1345 putushort(denp[1].deCDate, ndirent.de_CDate); 1346 putushort(denp[1].deCTime, ndirent.de_CTime); 1347 denp[1].deCHundredth = ndirent.de_CHun; 1348 putushort(denp[1].deADate, ndirent.de_ADate); 1349 putushort(denp[1].deMDate, ndirent.de_MDate); 1350 putushort(denp[1].deMTime, ndirent.de_MTime); 1351 if (FAT32(pmp)) { 1352 putushort(denp[0].deHighClust, newcluster >> 16); 1353 putushort(denp[1].deHighClust, pdep->de_StartCluster >> 16); 1354 } 1355 1356 error = bwrite(bp); 1357 if (error) 1358 goto bad; 1359 1360 /* 1361 * Now build up a directory entry pointing to the newly allocated 1362 * cluster. This will be written to an empty slot in the parent 1363 * directory. 1364 */ 1365 #ifdef DIAGNOSTIC 1366 if ((cnp->cn_flags & HASBUF) == 0) 1367 panic("msdosfs_mkdir: no name"); 1368 #endif 1369 error = uniqdosname(pdep, cnp, ndirent.de_Name); 1370 if (error) 1371 goto bad; 1372 1373 ndirent.de_Attributes = ATTR_DIRECTORY; 1374 ndirent.de_LowerCase = 0; 1375 ndirent.de_StartCluster = newcluster; 1376 ndirent.de_FileSize = 0; 1377 ndirent.de_dev = pdep->de_dev; 1378 error = createde(&ndirent, pdep, &dep, cnp); 1379 if (error) 1380 goto bad; 1381 *ap->a_vpp = DETOV(dep); 1382 return (0); 1383 1384 bad: 1385 clusterfree(pmp, newcluster, NULL); 1386 bad2: 1387 return (error); 1388 } 1389 1390 static int 1391 msdosfs_rmdir(ap) 1392 struct vop_rmdir_args /* { 1393 struct vnode *a_dvp; 1394 struct vnode *a_vp; 1395 struct componentname *a_cnp; 1396 } */ *ap; 1397 { 1398 struct vnode *vp = ap->a_vp; 1399 struct vnode *dvp = ap->a_dvp; 1400 struct componentname *cnp = ap->a_cnp; 1401 struct denode *ip, *dp; 1402 struct thread *td = cnp->cn_thread; 1403 int error; 1404 1405 ip = VTODE(vp); 1406 dp = VTODE(dvp); 1407 1408 /* 1409 * Verify the directory is empty (and valid). 1410 * (Rmdir ".." won't be valid since 1411 * ".." will contain a reference to 1412 * the current directory and thus be 1413 * non-empty.) 1414 */ 1415 error = 0; 1416 if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) { 1417 error = ENOTEMPTY; 1418 goto out; 1419 } 1420 /* 1421 * Delete the entry from the directory. For dos filesystems this 1422 * gets rid of the directory entry on disk, the in memory copy 1423 * still exists but the de_refcnt is <= 0. This prevents it from 1424 * being found by deget(). When the vput() on dep is done we give 1425 * up access and eventually msdosfs_reclaim() will be called which 1426 * will remove it from the denode cache. 1427 */ 1428 error = removede(dp, ip); 1429 if (error) 1430 goto out; 1431 /* 1432 * This is where we decrement the link count in the parent 1433 * directory. Since dos filesystems don't do this we just purge 1434 * the name cache. 1435 */ 1436 cache_purge(dvp); 1437 VOP_UNLOCK(dvp, 0, td); 1438 /* 1439 * Truncate the directory that is being deleted. 1440 */ 1441 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred, td); 1442 cache_purge(vp); 1443 1444 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td); 1445 out: 1446 return (error); 1447 } 1448 1449 /* 1450 * DOS filesystems don't know what symlinks are. 1451 */ 1452 static int 1453 msdosfs_symlink(ap) 1454 struct vop_symlink_args /* { 1455 struct vnode *a_dvp; 1456 struct vnode **a_vpp; 1457 struct componentname *a_cnp; 1458 struct vattr *a_vap; 1459 char *a_target; 1460 } */ *ap; 1461 { 1462 return (EOPNOTSUPP); 1463 } 1464 1465 static int 1466 msdosfs_readdir(ap) 1467 struct vop_readdir_args /* { 1468 struct vnode *a_vp; 1469 struct uio *a_uio; 1470 struct ucred *a_cred; 1471 int *a_eofflag; 1472 int *a_ncookies; 1473 u_long **a_cookies; 1474 } */ *ap; 1475 { 1476 int error = 0; 1477 int diff; 1478 long n; 1479 int blsize; 1480 long on; 1481 u_long cn; 1482 uint64_t fileno; 1483 u_long dirsperblk; 1484 long bias = 0; 1485 daddr_t bn, lbn; 1486 struct buf *bp; 1487 struct denode *dep = VTODE(ap->a_vp); 1488 struct msdosfsmount *pmp = dep->de_pmp; 1489 struct direntry *dentp; 1490 struct dirent dirbuf; 1491 struct uio *uio = ap->a_uio; 1492 u_long *cookies = NULL; 1493 int ncookies = 0; 1494 off_t offset, off; 1495 int chksum = -1; 1496 1497 #ifdef MSDOSFS_DEBUG 1498 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n", 1499 ap->a_vp, uio, ap->a_cred, ap->a_eofflag); 1500 #endif 1501 1502 /* 1503 * msdosfs_readdir() won't operate properly on regular files since 1504 * it does i/o only with the the filesystem vnode, and hence can 1505 * retrieve the wrong block from the buffer cache for a plain file. 1506 * So, fail attempts to readdir() on a plain file. 1507 */ 1508 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) 1509 return (ENOTDIR); 1510 1511 /* 1512 * To be safe, initialize dirbuf 1513 */ 1514 bzero(dirbuf.d_name, sizeof(dirbuf.d_name)); 1515 1516 /* 1517 * If the user buffer is smaller than the size of one dos directory 1518 * entry or the file offset is not a multiple of the size of a 1519 * directory entry, then we fail the read. 1520 */ 1521 off = offset = uio->uio_offset; 1522 if (uio->uio_resid < sizeof(struct direntry) || 1523 (offset & (sizeof(struct direntry) - 1))) 1524 return (EINVAL); 1525 1526 if (ap->a_ncookies) { 1527 ncookies = uio->uio_resid / 16; 1528 MALLOC(cookies, u_long *, ncookies * sizeof(u_long), M_TEMP, 1529 M_WAITOK); 1530 *ap->a_cookies = cookies; 1531 *ap->a_ncookies = ncookies; 1532 } 1533 1534 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 1535 1536 /* 1537 * If they are reading from the root directory then, we simulate 1538 * the . and .. entries since these don't exist in the root 1539 * directory. We also set the offset bias to make up for having to 1540 * simulate these entries. By this I mean that at file offset 64 we 1541 * read the first entry in the root directory that lives on disk. 1542 */ 1543 if (dep->de_StartCluster == MSDOSFSROOT 1544 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) { 1545 #if 0 1546 printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n", 1547 offset); 1548 #endif 1549 bias = 2 * sizeof(struct direntry); 1550 if (offset < bias) { 1551 for (n = (int)offset / sizeof(struct direntry); 1552 n < 2; n++) { 1553 if (FAT32(pmp)) 1554 fileno = (uint64_t)cntobn(pmp, 1555 pmp->pm_rootdirblk) 1556 * dirsperblk; 1557 else 1558 fileno = 1; 1559 if (pmp->pm_flags & MSDOSFS_LARGEFS) { 1560 dirbuf.d_fileno = 1561 msdosfs_fileno_map(pmp->pm_mountp, 1562 fileno); 1563 } else { 1564 1565 dirbuf.d_fileno = (uint32_t)fileno; 1566 } 1567 dirbuf.d_type = DT_DIR; 1568 switch (n) { 1569 case 0: 1570 dirbuf.d_namlen = 1; 1571 strcpy(dirbuf.d_name, "."); 1572 break; 1573 case 1: 1574 dirbuf.d_namlen = 2; 1575 strcpy(dirbuf.d_name, ".."); 1576 break; 1577 } 1578 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1579 if (uio->uio_resid < dirbuf.d_reclen) 1580 goto out; 1581 error = uiomove(&dirbuf, dirbuf.d_reclen, uio); 1582 if (error) 1583 goto out; 1584 offset += sizeof(struct direntry); 1585 off = offset; 1586 if (cookies) { 1587 *cookies++ = offset; 1588 if (--ncookies <= 0) 1589 goto out; 1590 } 1591 } 1592 } 1593 } 1594 1595 mbnambuf_init(); 1596 off = offset; 1597 while (uio->uio_resid > 0) { 1598 lbn = de_cluster(pmp, offset - bias); 1599 on = (offset - bias) & pmp->pm_crbomask; 1600 n = min(pmp->pm_bpcluster - on, uio->uio_resid); 1601 diff = dep->de_FileSize - (offset - bias); 1602 if (diff <= 0) 1603 break; 1604 n = min(n, diff); 1605 error = pcbmap(dep, lbn, &bn, &cn, &blsize); 1606 if (error) 1607 break; 1608 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp); 1609 if (error) { 1610 brelse(bp); 1611 return (error); 1612 } 1613 n = min(n, blsize - bp->b_resid); 1614 if (n == 0) { 1615 brelse(bp); 1616 return (EIO); 1617 } 1618 1619 /* 1620 * Convert from dos directory entries to fs-independent 1621 * directory entries. 1622 */ 1623 for (dentp = (struct direntry *)(bp->b_data + on); 1624 (char *)dentp < bp->b_data + on + n; 1625 dentp++, offset += sizeof(struct direntry)) { 1626 #if 0 1627 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n", 1628 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes); 1629 #endif 1630 /* 1631 * If this is an unused entry, we can stop. 1632 */ 1633 if (dentp->deName[0] == SLOT_EMPTY) { 1634 brelse(bp); 1635 goto out; 1636 } 1637 /* 1638 * Skip deleted entries. 1639 */ 1640 if (dentp->deName[0] == SLOT_DELETED) { 1641 chksum = -1; 1642 mbnambuf_init(); 1643 continue; 1644 } 1645 1646 /* 1647 * Handle Win95 long directory entries 1648 */ 1649 if (dentp->deAttributes == ATTR_WIN95) { 1650 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) 1651 continue; 1652 chksum = win2unixfn((struct winentry *)dentp, 1653 chksum, pmp); 1654 continue; 1655 } 1656 1657 /* 1658 * Skip volume labels 1659 */ 1660 if (dentp->deAttributes & ATTR_VOLUME) { 1661 chksum = -1; 1662 mbnambuf_init(); 1663 continue; 1664 } 1665 /* 1666 * This computation of d_fileno must match 1667 * the computation of va_fileid in 1668 * msdosfs_getattr. 1669 */ 1670 if (dentp->deAttributes & ATTR_DIRECTORY) { 1671 fileno = getushort(dentp->deStartCluster); 1672 if (FAT32(pmp)) 1673 fileno |= getushort(dentp->deHighClust) << 16; 1674 /* if this is the root directory */ 1675 if (fileno == MSDOSFSROOT) 1676 if (FAT32(pmp)) 1677 fileno = (uint64_t)cntobn(pmp, 1678 pmp->pm_rootdirblk) 1679 * dirsperblk; 1680 else 1681 fileno = 1; 1682 else 1683 fileno = (uint64_t)cntobn(pmp, fileno) * 1684 dirsperblk; 1685 dirbuf.d_type = DT_DIR; 1686 } else { 1687 fileno = (uint64_t)offset / sizeof(struct direntry); 1688 dirbuf.d_type = DT_REG; 1689 } 1690 if (pmp->pm_flags & MSDOSFS_LARGEFS) { 1691 dirbuf.d_fileno = 1692 msdosfs_fileno_map(pmp->pm_mountp, fileno); 1693 } else 1694 dirbuf.d_fileno = (uint32_t)fileno; 1695 1696 if (chksum != winChksum(dentp->deName)) { 1697 dirbuf.d_namlen = dos2unixfn(dentp->deName, 1698 (u_char *)dirbuf.d_name, 1699 dentp->deLowerCase | 1700 ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ? 1701 (LCASE_BASE | LCASE_EXT) : 0), 1702 pmp); 1703 mbnambuf_init(); 1704 } else 1705 mbnambuf_flush(&dirbuf); 1706 chksum = -1; 1707 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1708 if (uio->uio_resid < dirbuf.d_reclen) { 1709 brelse(bp); 1710 goto out; 1711 } 1712 error = uiomove(&dirbuf, dirbuf.d_reclen, uio); 1713 if (error) { 1714 brelse(bp); 1715 goto out; 1716 } 1717 if (cookies) { 1718 *cookies++ = offset + sizeof(struct direntry); 1719 if (--ncookies <= 0) { 1720 brelse(bp); 1721 goto out; 1722 } 1723 } 1724 off = offset + sizeof(struct direntry); 1725 } 1726 brelse(bp); 1727 } 1728 out: 1729 /* Subtract unused cookies */ 1730 if (ap->a_ncookies) 1731 *ap->a_ncookies -= ncookies; 1732 1733 uio->uio_offset = off; 1734 1735 /* 1736 * Set the eofflag (NFS uses it) 1737 */ 1738 if (ap->a_eofflag) { 1739 if (dep->de_FileSize - (offset - bias) <= 0) 1740 *ap->a_eofflag = 1; 1741 else 1742 *ap->a_eofflag = 0; 1743 } 1744 return (error); 1745 } 1746 1747 /* 1748 * vp - address of vnode file the file 1749 * bn - which cluster we are interested in mapping to a filesystem block number. 1750 * vpp - returns the vnode for the block special file holding the filesystem 1751 * containing the file of interest 1752 * bnp - address of where to return the filesystem relative block number 1753 */ 1754 static int 1755 msdosfs_bmap(ap) 1756 struct vop_bmap_args /* { 1757 struct vnode *a_vp; 1758 daddr_t a_bn; 1759 struct bufobj **a_bop; 1760 daddr_t *a_bnp; 1761 int *a_runp; 1762 int *a_runb; 1763 } */ *ap; 1764 { 1765 struct denode *dep = VTODE(ap->a_vp); 1766 daddr_t blkno; 1767 int error; 1768 1769 if (ap->a_bop != NULL) 1770 *ap->a_bop = &dep->de_pmp->pm_devvp->v_bufobj; 1771 if (ap->a_bnp == NULL) 1772 return (0); 1773 if (ap->a_runp) { 1774 /* 1775 * Sequential clusters should be counted here. 1776 */ 1777 *ap->a_runp = 0; 1778 } 1779 if (ap->a_runb) { 1780 *ap->a_runb = 0; 1781 } 1782 error = pcbmap(dep, ap->a_bn, &blkno, 0, 0); 1783 *ap->a_bnp = blkno; 1784 return (error); 1785 } 1786 1787 static int 1788 msdosfs_strategy(ap) 1789 struct vop_strategy_args /* { 1790 struct vnode *a_vp; 1791 struct buf *a_bp; 1792 } */ *ap; 1793 { 1794 struct buf *bp = ap->a_bp; 1795 struct denode *dep = VTODE(ap->a_vp); 1796 struct bufobj *bo; 1797 int error = 0; 1798 daddr_t blkno; 1799 1800 /* 1801 * If we don't already know the filesystem relative block number 1802 * then get it using pcbmap(). If pcbmap() returns the block 1803 * number as -1 then we've got a hole in the file. DOS filesystems 1804 * don't allow files with holes, so we shouldn't ever see this. 1805 */ 1806 if (bp->b_blkno == bp->b_lblkno) { 1807 error = pcbmap(dep, bp->b_lblkno, &blkno, 0, 0); 1808 bp->b_blkno = blkno; 1809 if (error) { 1810 bp->b_error = error; 1811 bp->b_ioflags |= BIO_ERROR; 1812 bufdone(bp); 1813 return (error); 1814 } 1815 if ((long)bp->b_blkno == -1) 1816 vfs_bio_clrbuf(bp); 1817 } 1818 if (bp->b_blkno == -1) { 1819 bufdone(bp); 1820 return (0); 1821 } 1822 /* 1823 * Read/write the block from/to the disk that contains the desired 1824 * file block. 1825 */ 1826 bp->b_iooffset = dbtob(bp->b_blkno); 1827 bo = dep->de_pmp->pm_bo; 1828 BO_STRATEGY(bo, bp); 1829 return (0); 1830 } 1831 1832 static int 1833 msdosfs_print(ap) 1834 struct vop_print_args /* { 1835 struct vnode *vp; 1836 } */ *ap; 1837 { 1838 struct denode *dep = VTODE(ap->a_vp); 1839 1840 printf("\tstartcluster %lu, dircluster %lu, diroffset %lu, ", 1841 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset); 1842 printf("on dev %s\n", devtoname(dep->de_dev)); 1843 return (0); 1844 } 1845 1846 static int 1847 msdosfs_pathconf(ap) 1848 struct vop_pathconf_args /* { 1849 struct vnode *a_vp; 1850 int a_name; 1851 int *a_retval; 1852 } */ *ap; 1853 { 1854 struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp; 1855 1856 switch (ap->a_name) { 1857 case _PC_LINK_MAX: 1858 *ap->a_retval = 1; 1859 return (0); 1860 case _PC_NAME_MAX: 1861 *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12; 1862 return (0); 1863 case _PC_PATH_MAX: 1864 *ap->a_retval = PATH_MAX; 1865 return (0); 1866 case _PC_CHOWN_RESTRICTED: 1867 *ap->a_retval = 1; 1868 return (0); 1869 case _PC_NO_TRUNC: 1870 *ap->a_retval = 0; 1871 return (0); 1872 default: 1873 return (EINVAL); 1874 } 1875 /* NOTREACHED */ 1876 } 1877 1878 static int 1879 msdosfs_advlock(ap) 1880 struct vop_advlock_args /* { 1881 struct vnode *a_vp; 1882 u_char a_id; 1883 int a_op; 1884 struct flock *a_fl; 1885 int a_flags; 1886 } */ *ap; 1887 { 1888 struct denode *dep = VTODE(ap->a_vp); 1889 1890 return (lf_advlock(ap, &dep->de_lockf, dep->de_FileSize)); 1891 } 1892 1893 static int 1894 msdosfs_advlockasync(ap) 1895 struct vop_advlockasync_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 struct task *a_task; 1902 } */ *ap; 1903 { 1904 struct denode *dep = VTODE(ap->a_vp); 1905 1906 return (lf_advlockasync(ap, &dep->de_lockf, dep->de_FileSize)); 1907 } 1908 1909 /* Global vfs data structures for msdosfs */ 1910 struct vop_vector msdosfs_vnodeops = { 1911 .vop_default = &default_vnodeops, 1912 1913 .vop_access = msdosfs_access, 1914 .vop_advlock = msdosfs_advlock, 1915 .vop_advlockasync = msdosfs_advlockasync, 1916 .vop_bmap = msdosfs_bmap, 1917 .vop_cachedlookup = msdosfs_lookup, 1918 .vop_open = msdosfs_open, 1919 .vop_close = msdosfs_close, 1920 .vop_create = msdosfs_create, 1921 .vop_fsync = msdosfs_fsync, 1922 .vop_getattr = msdosfs_getattr, 1923 .vop_inactive = msdosfs_inactive, 1924 .vop_link = msdosfs_link, 1925 .vop_lookup = vfs_cache_lookup, 1926 .vop_mkdir = msdosfs_mkdir, 1927 .vop_mknod = msdosfs_mknod, 1928 .vop_pathconf = msdosfs_pathconf, 1929 .vop_print = msdosfs_print, 1930 .vop_read = msdosfs_read, 1931 .vop_readdir = msdosfs_readdir, 1932 .vop_reclaim = msdosfs_reclaim, 1933 .vop_remove = msdosfs_remove, 1934 .vop_rename = msdosfs_rename, 1935 .vop_rmdir = msdosfs_rmdir, 1936 .vop_setattr = msdosfs_setattr, 1937 .vop_strategy = msdosfs_strategy, 1938 .vop_symlink = msdosfs_symlink, 1939 .vop_write = msdosfs_write, 1940 };
Cache object: 473e84758d7627ee6e363aee0a0d82c9
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