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sys/fs/msdosfs/msdosfs_vnops.c
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1 /* $FreeBSD: releng/6.0/sys/fs/msdosfs/msdosfs_vnops.c 142692 2005-02-27 21:16:26Z phk $ */ 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 #include "opt_msdosfs.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; 110 111 /* 112 * Some general notes: 113 * 114 * In the ufs filesystem the inodes, superblocks, and indirect blocks are 115 * read/written using the vnode for the filesystem. Blocks that represent 116 * the contents of a file are read/written using the vnode for the file 117 * (including directories when they are read/written as files). This 118 * presents problems for the dos filesystem because data that should be in 119 * an inode (if dos had them) resides in the directory itself. Since we 120 * must update directory entries without the benefit of having the vnode 121 * for the directory we must use the vnode for the filesystem. This means 122 * that when a directory is actually read/written (via read, write, or 123 * readdir, or seek) we must use the vnode for the filesystem instead of 124 * the vnode for the directory as would happen in ufs. This is to insure we 125 * retreive the correct block from the buffer cache since the hash value is 126 * based upon the vnode address and the desired block number. 127 */ 128 129 /* 130 * Create a regular file. On entry the directory to contain the file being 131 * created is locked. We must release before we return. We must also free 132 * the pathname buffer pointed at by cnp->cn_pnbuf, always on error, or 133 * only if the SAVESTART bit in cn_flags is clear on success. 134 */ 135 static int 136 msdosfs_create(ap) 137 struct vop_create_args /* { 138 struct vnode *a_dvp; 139 struct vnode **a_vpp; 140 struct componentname *a_cnp; 141 struct vattr *a_vap; 142 } */ *ap; 143 { 144 struct componentname *cnp = ap->a_cnp; 145 struct denode ndirent; 146 struct denode *dep; 147 struct denode *pdep = VTODE(ap->a_dvp); 148 struct timespec ts; 149 int error; 150 151 #ifdef MSDOSFS_DEBUG 152 printf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap); 153 #endif 154 155 /* 156 * If this is the root directory and there is no space left we 157 * can't do anything. This is because the root directory can not 158 * change size. 159 */ 160 if (pdep->de_StartCluster == MSDOSFSROOT 161 && pdep->de_fndoffset >= pdep->de_FileSize) { 162 error = ENOSPC; 163 goto bad; 164 } 165 166 /* 167 * Create a directory entry for the file, then call createde() to 168 * have it installed. NOTE: DOS files are always executable. We 169 * use the absence of the owner write bit to make the file 170 * readonly. 171 */ 172 #ifdef DIAGNOSTIC 173 if ((cnp->cn_flags & HASBUF) == 0) 174 panic("msdosfs_create: no name"); 175 #endif 176 bzero(&ndirent, sizeof(ndirent)); 177 error = uniqdosname(pdep, cnp, ndirent.de_Name); 178 if (error) 179 goto bad; 180 181 ndirent.de_Attributes = (ap->a_vap->va_mode & VWRITE) ? 182 ATTR_ARCHIVE : ATTR_ARCHIVE | ATTR_READONLY; 183 ndirent.de_LowerCase = 0; 184 ndirent.de_StartCluster = 0; 185 ndirent.de_FileSize = 0; 186 ndirent.de_dev = pdep->de_dev; 187 ndirent.de_pmp = pdep->de_pmp; 188 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 189 getnanotime(&ts); 190 DETIMES(&ndirent, &ts, &ts, &ts); 191 error = createde(&ndirent, pdep, &dep, cnp); 192 if (error) 193 goto bad; 194 *ap->a_vpp = DETOV(dep); 195 return (0); 196 197 bad: 198 return (error); 199 } 200 201 static int 202 msdosfs_mknod(ap) 203 struct vop_mknod_args /* { 204 struct vnode *a_dvp; 205 struct vnode **a_vpp; 206 struct componentname *a_cnp; 207 struct vattr *a_vap; 208 } */ *ap; 209 { 210 return (EINVAL); 211 } 212 213 static int 214 msdosfs_open(ap) 215 struct vop_open_args /* { 216 struct vnode *a_vp; 217 int a_mode; 218 struct ucred *a_cred; 219 struct thread *a_td; 220 int a_fdidx; 221 } */ *ap; 222 { 223 struct denode *dep = VTODE(ap->a_vp); 224 vnode_create_vobject(ap->a_vp, dep->de_FileSize, ap->a_td); 225 return 0; 226 } 227 228 static int 229 msdosfs_close(ap) 230 struct vop_close_args /* { 231 struct vnode *a_vp; 232 int a_fflag; 233 struct ucred *a_cred; 234 struct thread *a_td; 235 } */ *ap; 236 { 237 struct vnode *vp = ap->a_vp; 238 struct denode *dep = VTODE(vp); 239 struct timespec ts; 240 241 VI_LOCK(vp); 242 if (vp->v_usecount > 1) { 243 getnanotime(&ts); 244 DETIMES(dep, &ts, &ts, &ts); 245 } 246 VI_UNLOCK(vp); 247 return 0; 248 } 249 250 static int 251 msdosfs_access(ap) 252 struct vop_access_args /* { 253 struct vnode *a_vp; 254 int a_mode; 255 struct ucred *a_cred; 256 struct thread *a_td; 257 } */ *ap; 258 { 259 struct vnode *vp = ap->a_vp; 260 struct denode *dep = VTODE(ap->a_vp); 261 struct msdosfsmount *pmp = dep->de_pmp; 262 mode_t file_mode, mode = ap->a_mode; 263 264 file_mode = (S_IXUSR|S_IXGRP|S_IXOTH) | (S_IRUSR|S_IRGRP|S_IROTH) | 265 ((dep->de_Attributes & ATTR_READONLY) ? 0 : (S_IWUSR|S_IWGRP|S_IWOTH)); 266 file_mode &= (vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); 267 268 /* 269 * Disallow write attempts on read-only filesystems; 270 * unless the file is a socket, fifo, or a block or 271 * character device resident on the filesystem. 272 */ 273 if (mode & VWRITE) { 274 switch (vp->v_type) { 275 case VDIR: 276 case VLNK: 277 case VREG: 278 if (vp->v_mount->mnt_flag & MNT_RDONLY) 279 return (EROFS); 280 break; 281 default: 282 break; 283 } 284 } 285 286 return (vaccess(vp->v_type, file_mode, pmp->pm_uid, pmp->pm_gid, 287 ap->a_mode, ap->a_cred, NULL)); 288 } 289 290 static int 291 msdosfs_getattr(ap) 292 struct vop_getattr_args /* { 293 struct vnode *a_vp; 294 struct vattr *a_vap; 295 struct ucred *a_cred; 296 struct thread *a_td; 297 } */ *ap; 298 { 299 struct denode *dep = VTODE(ap->a_vp); 300 struct msdosfsmount *pmp = dep->de_pmp; 301 struct vattr *vap = ap->a_vap; 302 mode_t mode; 303 struct timespec ts; 304 u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 305 uint64_t fileid; 306 307 getnanotime(&ts); 308 DETIMES(dep, &ts, &ts, &ts); 309 vap->va_fsid = dev2udev(dep->de_dev); 310 /* 311 * The following computation of the fileid must be the same as that 312 * used in msdosfs_readdir() to compute d_fileno. If not, pwd 313 * doesn't work. 314 */ 315 if (dep->de_Attributes & ATTR_DIRECTORY) { 316 fileid = (uint64_t)cntobn(pmp, dep->de_StartCluster) * 317 dirsperblk; 318 if (dep->de_StartCluster == MSDOSFSROOT) 319 fileid = 1; 320 } else { 321 fileid = (uint64_t)cntobn(pmp, dep->de_dirclust) * 322 dirsperblk; 323 if (dep->de_dirclust == MSDOSFSROOT) 324 fileid = (uint64_t)roottobn(pmp, 0) * dirsperblk; 325 fileid += (uint64_t)dep->de_diroffset / sizeof(struct direntry); 326 } 327 #ifdef MSDOSFS_LARGE 328 vap->va_fileid = msdosfs_fileno_map(pmp->pm_mountp, fileid); 329 #else 330 vap->va_fileid = (long)fileid; 331 #endif 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 if (pmp->pm_flags & MSDOSFSMNT_LONGNAME) { 345 dos2unixtime(dep->de_ADate, 0, 0, &vap->va_atime); 346 dos2unixtime(dep->de_CDate, dep->de_CTime, dep->de_CHun, &vap->va_ctime); 347 } else { 348 vap->va_atime = vap->va_mtime; 349 vap->va_ctime = vap->va_mtime; 350 } 351 vap->va_flags = 0; 352 if ((dep->de_Attributes & ATTR_ARCHIVE) == 0) 353 vap->va_flags |= SF_ARCHIVED; 354 vap->va_gen = 0; 355 vap->va_blocksize = pmp->pm_bpcluster; 356 vap->va_bytes = 357 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask; 358 vap->va_type = ap->a_vp->v_type; 359 vap->va_filerev = dep->de_modrev; 360 return (0); 361 } 362 363 static int 364 msdosfs_setattr(ap) 365 struct vop_setattr_args /* { 366 struct vnode *a_vp; 367 struct vattr *a_vap; 368 struct ucred *a_cred; 369 struct thread *a_td; 370 } */ *ap; 371 { 372 struct vnode *vp = ap->a_vp; 373 struct denode *dep = VTODE(ap->a_vp); 374 struct msdosfsmount *pmp = dep->de_pmp; 375 struct vattr *vap = ap->a_vap; 376 struct ucred *cred = ap->a_cred; 377 int error = 0; 378 379 #ifdef MSDOSFS_DEBUG 380 printf("msdosfs_setattr(): vp %p, vap %p, cred %p, p %p\n", 381 ap->a_vp, vap, cred, ap->a_td); 382 #endif 383 384 /* 385 * Check for unsettable attributes. 386 */ 387 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 388 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 389 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 390 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 391 #ifdef MSDOSFS_DEBUG 392 printf("msdosfs_setattr(): returning EINVAL\n"); 393 printf(" va_type %d, va_nlink %x, va_fsid %lx, va_fileid %lx\n", 394 vap->va_type, vap->va_nlink, vap->va_fsid, vap->va_fileid); 395 printf(" va_blocksize %lx, va_rdev %x, va_bytes %qx, va_gen %lx\n", 396 vap->va_blocksize, vap->va_rdev, vap->va_bytes, vap->va_gen); 397 printf(" va_uid %x, va_gid %x\n", 398 vap->va_uid, vap->va_gid); 399 #endif 400 return (EINVAL); 401 } 402 if (vap->va_flags != VNOVAL) { 403 if (vp->v_mount->mnt_flag & MNT_RDONLY) 404 return (EROFS); 405 if (cred->cr_uid != pmp->pm_uid && 406 (error = suser_cred(cred, SUSER_ALLOWJAIL))) 407 return (error); 408 /* 409 * We are very inconsistent about handling unsupported 410 * attributes. We ignored the access time and the 411 * read and execute bits. We were strict for the other 412 * attributes. 413 * 414 * Here we are strict, stricter than ufs in not allowing 415 * users to attempt to set SF_SETTABLE bits or anyone to 416 * set unsupported bits. However, we ignore attempts to 417 * set ATTR_ARCHIVE for directories `cp -pr' from a more 418 * sensible filesystem attempts it a lot. 419 */ 420 if (suser_cred(cred, SUSER_ALLOWJAIL)) { 421 if (vap->va_flags & SF_SETTABLE) 422 return EPERM; 423 } 424 if (vap->va_flags & ~SF_ARCHIVED) 425 return EOPNOTSUPP; 426 if (vap->va_flags & SF_ARCHIVED) 427 dep->de_Attributes &= ~ATTR_ARCHIVE; 428 else if (!(dep->de_Attributes & ATTR_DIRECTORY)) 429 dep->de_Attributes |= ATTR_ARCHIVE; 430 dep->de_flag |= DE_MODIFIED; 431 } 432 433 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 434 uid_t uid; 435 gid_t gid; 436 437 if (vp->v_mount->mnt_flag & MNT_RDONLY) 438 return (EROFS); 439 uid = vap->va_uid; 440 if (uid == (uid_t)VNOVAL) 441 uid = pmp->pm_uid; 442 gid = vap->va_gid; 443 if (gid == (gid_t)VNOVAL) 444 gid = pmp->pm_gid; 445 if ((cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid || 446 (gid != pmp->pm_gid && !groupmember(gid, cred))) && 447 (error = suser_cred(cred, SUSER_ALLOWJAIL))) 448 return error; 449 if (uid != pmp->pm_uid || gid != pmp->pm_gid) 450 return EINVAL; 451 } 452 453 if (vap->va_size != VNOVAL) { 454 /* 455 * Disallow write attempts on read-only filesystems; 456 * unless the file is a socket, fifo, or a block or 457 * character device resident on the filesystem. 458 */ 459 switch (vp->v_type) { 460 case VDIR: 461 return (EISDIR); 462 /* NOT REACHED */ 463 case VLNK: 464 case VREG: 465 if (vp->v_mount->mnt_flag & MNT_RDONLY) 466 return (EROFS); 467 break; 468 default: 469 break; 470 } 471 error = detrunc(dep, vap->va_size, 0, cred, ap->a_td); 472 if (error) 473 return error; 474 } 475 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 476 if (vp->v_mount->mnt_flag & MNT_RDONLY) 477 return (EROFS); 478 if (cred->cr_uid != pmp->pm_uid && 479 (error = suser_cred(cred, SUSER_ALLOWJAIL)) && 480 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 481 (error = VOP_ACCESS(ap->a_vp, VWRITE, cred, ap->a_td)))) 482 return (error); 483 if (vp->v_type != VDIR) { 484 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 && 485 vap->va_atime.tv_sec != VNOVAL) { 486 dep->de_flag &= ~DE_ACCESS; 487 unix2dostime(&vap->va_atime, &dep->de_ADate, 488 NULL, NULL); 489 } 490 if (vap->va_mtime.tv_sec != VNOVAL) { 491 dep->de_flag &= ~DE_UPDATE; 492 unix2dostime(&vap->va_mtime, &dep->de_MDate, 493 &dep->de_MTime, NULL); 494 } 495 dep->de_Attributes |= ATTR_ARCHIVE; 496 dep->de_flag |= DE_MODIFIED; 497 } 498 } 499 /* 500 * DOS files only have the ability to have their writability 501 * attribute set, so we use the owner write bit to set the readonly 502 * attribute. 503 */ 504 if (vap->va_mode != (mode_t)VNOVAL) { 505 if (vp->v_mount->mnt_flag & MNT_RDONLY) 506 return (EROFS); 507 if (cred->cr_uid != pmp->pm_uid && 508 (error = suser_cred(cred, SUSER_ALLOWJAIL))) 509 return (error); 510 if (vp->v_type != VDIR) { 511 /* We ignore the read and execute bits. */ 512 if (vap->va_mode & VWRITE) 513 dep->de_Attributes &= ~ATTR_READONLY; 514 else 515 dep->de_Attributes |= ATTR_READONLY; 516 dep->de_Attributes |= ATTR_ARCHIVE; 517 dep->de_flag |= DE_MODIFIED; 518 } 519 } 520 return (deupdat(dep, 1)); 521 } 522 523 static int 524 msdosfs_read(ap) 525 struct vop_read_args /* { 526 struct vnode *a_vp; 527 struct uio *a_uio; 528 int a_ioflag; 529 struct ucred *a_cred; 530 } */ *ap; 531 { 532 int error = 0; 533 int blsize; 534 int isadir; 535 int orig_resid; 536 u_int n; 537 u_long diff; 538 u_long on; 539 daddr_t lbn; 540 daddr_t rablock; 541 int rasize; 542 int seqcount; 543 struct buf *bp; 544 struct vnode *vp = ap->a_vp; 545 struct denode *dep = VTODE(vp); 546 struct msdosfsmount *pmp = dep->de_pmp; 547 struct uio *uio = ap->a_uio; 548 549 if (uio->uio_offset < 0) 550 return (EINVAL); 551 552 if ((uoff_t)uio->uio_offset > DOS_FILESIZE_MAX) 553 return (0); 554 /* 555 * If they didn't ask for any data, then we are done. 556 */ 557 orig_resid = uio->uio_resid; 558 if (orig_resid <= 0) 559 return (0); 560 561 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 562 563 isadir = dep->de_Attributes & ATTR_DIRECTORY; 564 do { 565 if (uio->uio_offset >= dep->de_FileSize) 566 break; 567 lbn = de_cluster(pmp, uio->uio_offset); 568 /* 569 * If we are operating on a directory file then be sure to 570 * do i/o with the vnode for the filesystem instead of the 571 * vnode for the directory. 572 */ 573 if (isadir) { 574 /* convert cluster # to block # */ 575 error = pcbmap(dep, lbn, &lbn, 0, &blsize); 576 if (error == E2BIG) { 577 error = EINVAL; 578 break; 579 } else if (error) 580 break; 581 error = bread(pmp->pm_devvp, lbn, blsize, NOCRED, &bp); 582 } else { 583 blsize = pmp->pm_bpcluster; 584 rablock = lbn + 1; 585 if (seqcount > 1 && 586 de_cn2off(pmp, rablock) < dep->de_FileSize) { 587 rasize = pmp->pm_bpcluster; 588 error = breadn(vp, lbn, blsize, 589 &rablock, &rasize, 1, NOCRED, &bp); 590 } else { 591 error = bread(vp, lbn, blsize, NOCRED, &bp); 592 } 593 } 594 if (error) { 595 brelse(bp); 596 break; 597 } 598 on = uio->uio_offset & pmp->pm_crbomask; 599 diff = pmp->pm_bpcluster - on; 600 n = diff > uio->uio_resid ? uio->uio_resid : diff; 601 diff = dep->de_FileSize - uio->uio_offset; 602 if (diff < n) 603 n = diff; 604 diff = blsize - bp->b_resid; 605 if (diff < n) 606 n = diff; 607 error = uiomove(bp->b_data + on, (int) n, uio); 608 brelse(bp); 609 } while (error == 0 && uio->uio_resid > 0 && n != 0); 610 if (!isadir && (error == 0 || uio->uio_resid != orig_resid) && 611 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 612 dep->de_flag |= DE_ACCESS; 613 return (error); 614 } 615 616 /* 617 * Write data to a file or directory. 618 */ 619 static int 620 msdosfs_write(ap) 621 struct vop_write_args /* { 622 struct vnode *a_vp; 623 struct uio *a_uio; 624 int a_ioflag; 625 struct ucred *a_cred; 626 } */ *ap; 627 { 628 int n; 629 int croffset; 630 int resid; 631 u_long osize; 632 int error = 0; 633 u_long count; 634 daddr_t bn, lastcn; 635 struct buf *bp; 636 int ioflag = ap->a_ioflag; 637 struct uio *uio = ap->a_uio; 638 struct thread *td = uio->uio_td; 639 struct vnode *vp = ap->a_vp; 640 struct vnode *thisvp; 641 struct denode *dep = VTODE(vp); 642 struct msdosfsmount *pmp = dep->de_pmp; 643 struct ucred *cred = ap->a_cred; 644 645 #ifdef MSDOSFS_DEBUG 646 printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n", 647 vp, uio, ioflag, cred); 648 printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n", 649 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster); 650 #endif 651 652 switch (vp->v_type) { 653 case VREG: 654 if (ioflag & IO_APPEND) 655 uio->uio_offset = dep->de_FileSize; 656 thisvp = vp; 657 break; 658 case VDIR: 659 return EISDIR; 660 default: 661 panic("msdosfs_write(): bad file type"); 662 } 663 664 if (uio->uio_offset < 0) 665 return (EFBIG); 666 667 if (uio->uio_resid == 0) 668 return (0); 669 670 /* 671 * If they've exceeded their filesize limit, tell them about it. 672 */ 673 if (td != NULL) { 674 PROC_LOCK(td->td_proc); 675 if ((uoff_t)uio->uio_offset + uio->uio_resid > 676 lim_cur(td->td_proc, RLIMIT_FSIZE)) { 677 psignal(td->td_proc, SIGXFSZ); 678 PROC_UNLOCK(td->td_proc); 679 return (EFBIG); 680 } 681 PROC_UNLOCK(td->td_proc); 682 } 683 684 if ((uoff_t)uio->uio_offset + uio->uio_resid > DOS_FILESIZE_MAX) 685 return (EFBIG); 686 687 /* 688 * If the offset we are starting the write at is beyond the end of 689 * the file, then they've done a seek. Unix filesystems allow 690 * files with holes in them, DOS doesn't so we must fill the hole 691 * with zeroed blocks. 692 */ 693 if (uio->uio_offset > dep->de_FileSize) { 694 error = deextend(dep, uio->uio_offset, cred); 695 if (error) 696 return (error); 697 } 698 699 /* 700 * Remember some values in case the write fails. 701 */ 702 resid = uio->uio_resid; 703 osize = dep->de_FileSize; 704 705 /* 706 * If we write beyond the end of the file, extend it to its ultimate 707 * size ahead of the time to hopefully get a contiguous area. 708 */ 709 if (uio->uio_offset + resid > osize) { 710 count = de_clcount(pmp, uio->uio_offset + resid) - 711 de_clcount(pmp, osize); 712 error = extendfile(dep, count, NULL, NULL, 0); 713 if (error && (error != ENOSPC || (ioflag & IO_UNIT))) 714 goto errexit; 715 lastcn = dep->de_fc[FC_LASTFC].fc_frcn; 716 } else 717 lastcn = de_clcount(pmp, osize) - 1; 718 719 do { 720 if (de_cluster(pmp, uio->uio_offset) > lastcn) { 721 error = ENOSPC; 722 break; 723 } 724 725 croffset = uio->uio_offset & pmp->pm_crbomask; 726 n = min(uio->uio_resid, pmp->pm_bpcluster - croffset); 727 if (uio->uio_offset + n > dep->de_FileSize) { 728 dep->de_FileSize = uio->uio_offset + n; 729 /* The object size needs to be set before buffer is allocated */ 730 vnode_pager_setsize(vp, dep->de_FileSize); 731 } 732 733 bn = de_cluster(pmp, uio->uio_offset); 734 if ((uio->uio_offset & pmp->pm_crbomask) == 0 735 && (de_cluster(pmp, uio->uio_offset + uio->uio_resid) 736 > de_cluster(pmp, uio->uio_offset) 737 || uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) { 738 /* 739 * If either the whole cluster gets written, 740 * or we write the cluster from its start beyond EOF, 741 * then no need to read data from disk. 742 */ 743 bp = getblk(thisvp, bn, pmp->pm_bpcluster, 0, 0, 0); 744 clrbuf(bp); 745 /* 746 * Do the bmap now, since pcbmap needs buffers 747 * for the fat table. (see msdosfs_strategy) 748 */ 749 if (bp->b_blkno == bp->b_lblkno) { 750 error = pcbmap(dep, bp->b_lblkno, &bn, 0, 0); 751 if (error) 752 bp->b_blkno = -1; 753 else 754 bp->b_blkno = bn; 755 } 756 if (bp->b_blkno == -1) { 757 brelse(bp); 758 if (!error) 759 error = EIO; /* XXX */ 760 break; 761 } 762 } else { 763 /* 764 * The block we need to write into exists, so read it in. 765 */ 766 error = bread(thisvp, bn, pmp->pm_bpcluster, cred, &bp); 767 if (error) { 768 brelse(bp); 769 break; 770 } 771 } 772 773 /* 774 * Should these vnode_pager_* functions be done on dir 775 * files? 776 */ 777 778 /* 779 * Copy the data from user space into the buf header. 780 */ 781 error = uiomove(bp->b_data + croffset, n, uio); 782 if (error) { 783 brelse(bp); 784 break; 785 } 786 787 /* 788 * If they want this synchronous then write it and wait for 789 * it. Otherwise, if on a cluster boundary write it 790 * asynchronously so we can move on to the next block 791 * without delay. Otherwise do a delayed write because we 792 * may want to write somemore into the block later. 793 */ 794 if (ioflag & IO_SYNC) 795 (void) bwrite(bp); 796 else if (n + croffset == pmp->pm_bpcluster) 797 bawrite(bp); 798 else 799 bdwrite(bp); 800 dep->de_flag |= DE_UPDATE; 801 } while (error == 0 && uio->uio_resid > 0); 802 803 /* 804 * If the write failed and they want us to, truncate the file back 805 * to the size it was before the write was attempted. 806 */ 807 errexit: 808 if (error) { 809 if (ioflag & IO_UNIT) { 810 detrunc(dep, osize, ioflag & IO_SYNC, NOCRED, NULL); 811 uio->uio_offset -= resid - uio->uio_resid; 812 uio->uio_resid = resid; 813 } else { 814 detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC, NOCRED, NULL); 815 if (uio->uio_resid != resid) 816 error = 0; 817 } 818 } else if (ioflag & IO_SYNC) 819 error = deupdat(dep, 1); 820 return (error); 821 } 822 823 /* 824 * Flush the blocks of a file to disk. 825 * 826 * This function is worthless for vnodes that represent directories. Maybe we 827 * could just do a sync if they try an fsync on a directory file. 828 */ 829 static int 830 msdosfs_fsync(ap) 831 struct vop_fsync_args /* { 832 struct vnode *a_vp; 833 struct ucred *a_cred; 834 int a_waitfor; 835 struct thread *a_td; 836 } */ *ap; 837 { 838 /* 839 * Flush our dirty buffers. 840 */ 841 vop_stdfsync(ap); 842 843 return (deupdat(VTODE(ap->a_vp), ap->a_waitfor == MNT_WAIT)); 844 } 845 846 static int 847 msdosfs_remove(ap) 848 struct vop_remove_args /* { 849 struct vnode *a_dvp; 850 struct vnode *a_vp; 851 struct componentname *a_cnp; 852 } */ *ap; 853 { 854 struct denode *dep = VTODE(ap->a_vp); 855 struct denode *ddep = VTODE(ap->a_dvp); 856 int error; 857 858 if (ap->a_vp->v_type == VDIR) 859 error = EPERM; 860 else 861 error = removede(ddep, dep); 862 #ifdef MSDOSFS_DEBUG 863 printf("msdosfs_remove(), dep %p, v_usecount %d\n", dep, ap->a_vp->v_usecount); 864 #endif 865 return (error); 866 } 867 868 /* 869 * DOS filesystems don't know what links are. 870 */ 871 static int 872 msdosfs_link(ap) 873 struct vop_link_args /* { 874 struct vnode *a_tdvp; 875 struct vnode *a_vp; 876 struct componentname *a_cnp; 877 } */ *ap; 878 { 879 return (EOPNOTSUPP); 880 } 881 882 /* 883 * Renames on files require moving the denode to a new hash queue since the 884 * denode's location is used to compute which hash queue to put the file 885 * in. Unless it is a rename in place. For example "mv a b". 886 * 887 * What follows is the basic algorithm: 888 * 889 * if (file move) { 890 * if (dest file exists) { 891 * remove dest file 892 * } 893 * if (dest and src in same directory) { 894 * rewrite name in existing directory slot 895 * } else { 896 * write new entry in dest directory 897 * update offset and dirclust in denode 898 * move denode to new hash chain 899 * clear old directory entry 900 * } 901 * } else { 902 * directory move 903 * if (dest directory exists) { 904 * if (dest is not empty) { 905 * return ENOTEMPTY 906 * } 907 * remove dest directory 908 * } 909 * if (dest and src in same directory) { 910 * rewrite name in existing entry 911 * } else { 912 * be sure dest is not a child of src directory 913 * write entry in dest directory 914 * update "." and ".." in moved directory 915 * clear old directory entry for moved directory 916 * } 917 * } 918 * 919 * On entry: 920 * source's parent directory is unlocked 921 * source file or directory is unlocked 922 * destination's parent directory is locked 923 * destination file or directory is locked if it exists 924 * 925 * On exit: 926 * all denodes should be released 927 */ 928 static int 929 msdosfs_rename(ap) 930 struct vop_rename_args /* { 931 struct vnode *a_fdvp; 932 struct vnode *a_fvp; 933 struct componentname *a_fcnp; 934 struct vnode *a_tdvp; 935 struct vnode *a_tvp; 936 struct componentname *a_tcnp; 937 } */ *ap; 938 { 939 struct vnode *tdvp = ap->a_tdvp; 940 struct vnode *fvp = ap->a_fvp; 941 struct vnode *fdvp = ap->a_fdvp; 942 struct vnode *tvp = ap->a_tvp; 943 struct componentname *tcnp = ap->a_tcnp; 944 struct componentname *fcnp = ap->a_fcnp; 945 struct thread *td = fcnp->cn_thread; 946 struct denode *ip, *xp, *dp, *zp; 947 u_char toname[11], oldname[11]; 948 u_long from_diroffset, to_diroffset; 949 u_char to_count; 950 int doingdirectory = 0, newparent = 0; 951 int error; 952 u_long cn; 953 daddr_t bn; 954 struct denode *fddep; /* from file's parent directory */ 955 struct msdosfsmount *pmp; 956 struct direntry *dotdotp; 957 struct buf *bp; 958 959 fddep = VTODE(ap->a_fdvp); 960 pmp = fddep->de_pmp; 961 962 pmp = VFSTOMSDOSFS(fdvp->v_mount); 963 964 #ifdef DIAGNOSTIC 965 if ((tcnp->cn_flags & HASBUF) == 0 || 966 (fcnp->cn_flags & HASBUF) == 0) 967 panic("msdosfs_rename: no name"); 968 #endif 969 /* 970 * Check for cross-device rename. 971 */ 972 if ((fvp->v_mount != tdvp->v_mount) || 973 (tvp && (fvp->v_mount != tvp->v_mount))) { 974 error = EXDEV; 975 abortit: 976 if (tdvp == tvp) 977 vrele(tdvp); 978 else 979 vput(tdvp); 980 if (tvp) 981 vput(tvp); 982 vrele(fdvp); 983 vrele(fvp); 984 return (error); 985 } 986 987 /* 988 * If source and dest are the same, do nothing. 989 */ 990 if (tvp == fvp) { 991 error = 0; 992 goto abortit; 993 } 994 995 error = vn_lock(fvp, LK_EXCLUSIVE, td); 996 if (error) 997 goto abortit; 998 dp = VTODE(fdvp); 999 ip = VTODE(fvp); 1000 1001 /* 1002 * Be sure we are not renaming ".", "..", or an alias of ".". This 1003 * leads to a crippled directory tree. It's pretty tough to do a 1004 * "ls" or "pwd" with the "." directory entry missing, and "cd .." 1005 * doesn't work if the ".." entry is missing. 1006 */ 1007 if (ip->de_Attributes & ATTR_DIRECTORY) { 1008 /* 1009 * Avoid ".", "..", and aliases of "." for obvious reasons. 1010 */ 1011 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 1012 dp == ip || 1013 (fcnp->cn_flags & ISDOTDOT) || 1014 (tcnp->cn_flags & ISDOTDOT) || 1015 (ip->de_flag & DE_RENAME)) { 1016 VOP_UNLOCK(fvp, 0, td); 1017 error = EINVAL; 1018 goto abortit; 1019 } 1020 ip->de_flag |= DE_RENAME; 1021 doingdirectory++; 1022 } 1023 1024 /* 1025 * When the target exists, both the directory 1026 * and target vnodes are returned locked. 1027 */ 1028 dp = VTODE(tdvp); 1029 xp = tvp ? VTODE(tvp) : NULL; 1030 /* 1031 * Remember direntry place to use for destination 1032 */ 1033 to_diroffset = dp->de_fndoffset; 1034 to_count = dp->de_fndcnt; 1035 1036 /* 1037 * If ".." must be changed (ie the directory gets a new 1038 * parent) then the source directory must not be in the 1039 * directory heirarchy above the target, as this would 1040 * orphan everything below the source directory. Also 1041 * the user must have write permission in the source so 1042 * as to be able to change "..". We must repeat the call 1043 * to namei, as the parent directory is unlocked by the 1044 * call to doscheckpath(). 1045 */ 1046 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread); 1047 VOP_UNLOCK(fvp, 0, td); 1048 if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster) 1049 newparent = 1; 1050 if (doingdirectory && newparent) { 1051 if (error) /* write access check above */ 1052 goto bad; 1053 if (xp != NULL) 1054 vput(tvp); 1055 /* 1056 * doscheckpath() vput()'s dp, 1057 * so we have to do a relookup afterwards 1058 */ 1059 error = doscheckpath(ip, dp); 1060 if (error) 1061 goto out; 1062 if ((tcnp->cn_flags & SAVESTART) == 0) 1063 panic("msdosfs_rename: lost to startdir"); 1064 error = relookup(tdvp, &tvp, tcnp); 1065 if (error) 1066 goto out; 1067 dp = VTODE(tdvp); 1068 xp = tvp ? VTODE(tvp) : NULL; 1069 } 1070 1071 if (xp != NULL) { 1072 /* 1073 * Target must be empty if a directory and have no links 1074 * to it. Also, ensure source and target are compatible 1075 * (both directories, or both not directories). 1076 */ 1077 if (xp->de_Attributes & ATTR_DIRECTORY) { 1078 if (!dosdirempty(xp)) { 1079 error = ENOTEMPTY; 1080 goto bad; 1081 } 1082 if (!doingdirectory) { 1083 error = ENOTDIR; 1084 goto bad; 1085 } 1086 cache_purge(tdvp); 1087 } else if (doingdirectory) { 1088 error = EISDIR; 1089 goto bad; 1090 } 1091 error = removede(dp, xp); 1092 if (error) 1093 goto bad; 1094 vput(tvp); 1095 xp = NULL; 1096 } 1097 1098 /* 1099 * Convert the filename in tcnp into a dos filename. We copy this 1100 * into the denode and directory entry for the destination 1101 * file/directory. 1102 */ 1103 error = uniqdosname(VTODE(tdvp), tcnp, toname); 1104 if (error) 1105 goto abortit; 1106 1107 /* 1108 * Since from wasn't locked at various places above, 1109 * have to do a relookup here. 1110 */ 1111 fcnp->cn_flags &= ~MODMASK; 1112 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 1113 if ((fcnp->cn_flags & SAVESTART) == 0) 1114 panic("msdosfs_rename: lost from startdir"); 1115 if (!newparent) 1116 VOP_UNLOCK(tdvp, 0, td); 1117 if (relookup(fdvp, &fvp, fcnp) == 0) 1118 vrele(fdvp); 1119 if (fvp == NULL) { 1120 /* 1121 * From name has disappeared. 1122 */ 1123 if (doingdirectory) 1124 panic("rename: lost dir entry"); 1125 vrele(ap->a_fvp); 1126 if (newparent) 1127 VOP_UNLOCK(tdvp, 0, td); 1128 vrele(tdvp); 1129 return 0; 1130 } 1131 xp = VTODE(fvp); 1132 zp = VTODE(fdvp); 1133 from_diroffset = zp->de_fndoffset; 1134 1135 /* 1136 * Ensure that the directory entry still exists and has not 1137 * changed till now. If the source is a file the entry may 1138 * have been unlinked or renamed. In either case there is 1139 * no further work to be done. If the source is a directory 1140 * then it cannot have been rmdir'ed or renamed; this is 1141 * prohibited by the DE_RENAME flag. 1142 */ 1143 if (xp != ip) { 1144 if (doingdirectory) 1145 panic("rename: lost dir entry"); 1146 vrele(ap->a_fvp); 1147 VOP_UNLOCK(fvp, 0, td); 1148 if (newparent) 1149 VOP_UNLOCK(fdvp, 0, td); 1150 xp = NULL; 1151 } else { 1152 vrele(fvp); 1153 xp = NULL; 1154 1155 /* 1156 * First write a new entry in the destination 1157 * directory and mark the entry in the source directory 1158 * as deleted. Then move the denode to the correct hash 1159 * chain for its new location in the filesystem. And, if 1160 * we moved a directory, then update its .. entry to point 1161 * to the new parent directory. 1162 */ 1163 bcopy(ip->de_Name, oldname, 11); 1164 bcopy(toname, ip->de_Name, 11); /* update denode */ 1165 dp->de_fndoffset = to_diroffset; 1166 dp->de_fndcnt = to_count; 1167 error = createde(ip, dp, (struct denode **)0, tcnp); 1168 if (error) { 1169 bcopy(oldname, ip->de_Name, 11); 1170 if (newparent) 1171 VOP_UNLOCK(fdvp, 0, td); 1172 VOP_UNLOCK(fvp, 0, td); 1173 goto bad; 1174 } 1175 ip->de_refcnt++; 1176 zp->de_fndoffset = from_diroffset; 1177 error = removede(zp, ip); 1178 if (error) { 1179 /* XXX should really panic here, fs is corrupt */ 1180 if (newparent) 1181 VOP_UNLOCK(fdvp, 0, td); 1182 VOP_UNLOCK(fvp, 0, td); 1183 goto bad; 1184 } 1185 if (!doingdirectory) { 1186 error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0, 1187 &ip->de_dirclust, 0); 1188 if (error) { 1189 /* XXX should really panic here, fs is corrupt */ 1190 if (newparent) 1191 VOP_UNLOCK(fdvp, 0, td); 1192 VOP_UNLOCK(fvp, 0, td); 1193 goto bad; 1194 } 1195 if (ip->de_dirclust == MSDOSFSROOT) 1196 ip->de_diroffset = to_diroffset; 1197 else 1198 ip->de_diroffset = to_diroffset & pmp->pm_crbomask; 1199 } 1200 reinsert(ip); 1201 if (newparent) 1202 VOP_UNLOCK(fdvp, 0, td); 1203 } 1204 1205 /* 1206 * If we moved a directory to a new parent directory, then we must 1207 * fixup the ".." entry in the moved directory. 1208 */ 1209 if (doingdirectory && newparent) { 1210 cn = ip->de_StartCluster; 1211 if (cn == MSDOSFSROOT) { 1212 /* this should never happen */ 1213 panic("msdosfs_rename(): updating .. in root directory?"); 1214 } else 1215 bn = cntobn(pmp, cn); 1216 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, 1217 NOCRED, &bp); 1218 if (error) { 1219 /* XXX should really panic here, fs is corrupt */ 1220 brelse(bp); 1221 VOP_UNLOCK(fvp, 0, td); 1222 goto bad; 1223 } 1224 dotdotp = (struct direntry *)bp->b_data + 1; 1225 putushort(dotdotp->deStartCluster, dp->de_StartCluster); 1226 if (FAT32(pmp)) 1227 putushort(dotdotp->deHighClust, dp->de_StartCluster >> 16); 1228 error = bwrite(bp); 1229 if (error) { 1230 /* XXX should really panic here, fs is corrupt */ 1231 VOP_UNLOCK(fvp, 0, td); 1232 goto bad; 1233 } 1234 } 1235 1236 VOP_UNLOCK(fvp, 0, td); 1237 bad: 1238 if (xp) 1239 vput(tvp); 1240 vput(tdvp); 1241 out: 1242 ip->de_flag &= ~DE_RENAME; 1243 vrele(fdvp); 1244 vrele(fvp); 1245 return (error); 1246 1247 } 1248 1249 static struct { 1250 struct direntry dot; 1251 struct direntry dotdot; 1252 } dosdirtemplate = { 1253 { ". ", " ", /* the . entry */ 1254 ATTR_DIRECTORY, /* file attribute */ 1255 0, /* reserved */ 1256 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1257 { 0, 0 }, /* access date */ 1258 { 0, 0 }, /* high bits of start cluster */ 1259 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1260 { 0, 0 }, /* startcluster */ 1261 { 0, 0, 0, 0 } /* filesize */ 1262 }, 1263 { ".. ", " ", /* the .. entry */ 1264 ATTR_DIRECTORY, /* file attribute */ 1265 0, /* reserved */ 1266 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1267 { 0, 0 }, /* access date */ 1268 { 0, 0 }, /* high bits of start cluster */ 1269 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1270 { 0, 0 }, /* startcluster */ 1271 { 0, 0, 0, 0 } /* filesize */ 1272 } 1273 }; 1274 1275 static int 1276 msdosfs_mkdir(ap) 1277 struct vop_mkdir_args /* { 1278 struct vnode *a_dvp; 1279 struvt vnode **a_vpp; 1280 struvt componentname *a_cnp; 1281 struct vattr *a_vap; 1282 } */ *ap; 1283 { 1284 struct componentname *cnp = ap->a_cnp; 1285 struct denode *dep; 1286 struct denode *pdep = VTODE(ap->a_dvp); 1287 struct direntry *denp; 1288 struct msdosfsmount *pmp = pdep->de_pmp; 1289 struct buf *bp; 1290 u_long newcluster, pcl; 1291 int bn; 1292 int error; 1293 struct denode ndirent; 1294 struct timespec ts; 1295 1296 /* 1297 * If this is the root directory and there is no space left we 1298 * can't do anything. This is because the root directory can not 1299 * change size. 1300 */ 1301 if (pdep->de_StartCluster == MSDOSFSROOT 1302 && pdep->de_fndoffset >= pdep->de_FileSize) { 1303 error = ENOSPC; 1304 goto bad2; 1305 } 1306 1307 /* 1308 * Allocate a cluster to hold the about to be created directory. 1309 */ 1310 error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL); 1311 if (error) 1312 goto bad2; 1313 1314 bzero(&ndirent, sizeof(ndirent)); 1315 ndirent.de_pmp = pmp; 1316 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 1317 getnanotime(&ts); 1318 DETIMES(&ndirent, &ts, &ts, &ts); 1319 1320 /* 1321 * Now fill the cluster with the "." and ".." entries. And write 1322 * the cluster to disk. This way it is there for the parent 1323 * directory to be pointing at if there were a crash. 1324 */ 1325 bn = cntobn(pmp, newcluster); 1326 /* always succeeds */ 1327 bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0, 0); 1328 bzero(bp->b_data, pmp->pm_bpcluster); 1329 bcopy(&dosdirtemplate, bp->b_data, sizeof dosdirtemplate); 1330 denp = (struct direntry *)bp->b_data; 1331 putushort(denp[0].deStartCluster, newcluster); 1332 putushort(denp[0].deCDate, ndirent.de_CDate); 1333 putushort(denp[0].deCTime, ndirent.de_CTime); 1334 denp[0].deCHundredth = ndirent.de_CHun; 1335 putushort(denp[0].deADate, ndirent.de_ADate); 1336 putushort(denp[0].deMDate, ndirent.de_MDate); 1337 putushort(denp[0].deMTime, ndirent.de_MTime); 1338 pcl = pdep->de_StartCluster; 1339 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1340 pcl = 0; 1341 putushort(denp[1].deStartCluster, pcl); 1342 putushort(denp[1].deCDate, ndirent.de_CDate); 1343 putushort(denp[1].deCTime, ndirent.de_CTime); 1344 denp[1].deCHundredth = ndirent.de_CHun; 1345 putushort(denp[1].deADate, ndirent.de_ADate); 1346 putushort(denp[1].deMDate, ndirent.de_MDate); 1347 putushort(denp[1].deMTime, ndirent.de_MTime); 1348 if (FAT32(pmp)) { 1349 putushort(denp[0].deHighClust, newcluster >> 16); 1350 putushort(denp[1].deHighClust, pdep->de_StartCluster >> 16); 1351 } 1352 1353 error = bwrite(bp); 1354 if (error) 1355 goto bad; 1356 1357 /* 1358 * Now build up a directory entry pointing to the newly allocated 1359 * cluster. This will be written to an empty slot in the parent 1360 * directory. 1361 */ 1362 #ifdef DIAGNOSTIC 1363 if ((cnp->cn_flags & HASBUF) == 0) 1364 panic("msdosfs_mkdir: no name"); 1365 #endif 1366 error = uniqdosname(pdep, cnp, ndirent.de_Name); 1367 if (error) 1368 goto bad; 1369 1370 ndirent.de_Attributes = ATTR_DIRECTORY; 1371 ndirent.de_LowerCase = 0; 1372 ndirent.de_StartCluster = newcluster; 1373 ndirent.de_FileSize = 0; 1374 ndirent.de_dev = pdep->de_dev; 1375 error = createde(&ndirent, pdep, &dep, cnp); 1376 if (error) 1377 goto bad; 1378 *ap->a_vpp = DETOV(dep); 1379 return (0); 1380 1381 bad: 1382 clusterfree(pmp, newcluster, NULL); 1383 bad2: 1384 return (error); 1385 } 1386 1387 static int 1388 msdosfs_rmdir(ap) 1389 struct vop_rmdir_args /* { 1390 struct vnode *a_dvp; 1391 struct vnode *a_vp; 1392 struct componentname *a_cnp; 1393 } */ *ap; 1394 { 1395 struct vnode *vp = ap->a_vp; 1396 struct vnode *dvp = ap->a_dvp; 1397 struct componentname *cnp = ap->a_cnp; 1398 struct denode *ip, *dp; 1399 struct thread *td = cnp->cn_thread; 1400 int error; 1401 1402 ip = VTODE(vp); 1403 dp = VTODE(dvp); 1404 1405 /* 1406 * Verify the directory is empty (and valid). 1407 * (Rmdir ".." won't be valid since 1408 * ".." will contain a reference to 1409 * the current directory and thus be 1410 * non-empty.) 1411 */ 1412 error = 0; 1413 if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) { 1414 error = ENOTEMPTY; 1415 goto out; 1416 } 1417 /* 1418 * Delete the entry from the directory. For dos filesystems this 1419 * gets rid of the directory entry on disk, the in memory copy 1420 * still exists but the de_refcnt is <= 0. This prevents it from 1421 * being found by deget(). When the vput() on dep is done we give 1422 * up access and eventually msdosfs_reclaim() will be called which 1423 * will remove it from the denode cache. 1424 */ 1425 error = removede(dp, ip); 1426 if (error) 1427 goto out; 1428 /* 1429 * This is where we decrement the link count in the parent 1430 * directory. Since dos filesystems don't do this we just purge 1431 * the name cache. 1432 */ 1433 cache_purge(dvp); 1434 VOP_UNLOCK(dvp, 0, td); 1435 /* 1436 * Truncate the directory that is being deleted. 1437 */ 1438 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred, td); 1439 cache_purge(vp); 1440 1441 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td); 1442 out: 1443 return (error); 1444 } 1445 1446 /* 1447 * DOS filesystems don't know what symlinks are. 1448 */ 1449 static int 1450 msdosfs_symlink(ap) 1451 struct vop_symlink_args /* { 1452 struct vnode *a_dvp; 1453 struct vnode **a_vpp; 1454 struct componentname *a_cnp; 1455 struct vattr *a_vap; 1456 char *a_target; 1457 } */ *ap; 1458 { 1459 return (EOPNOTSUPP); 1460 } 1461 1462 static int 1463 msdosfs_readdir(ap) 1464 struct vop_readdir_args /* { 1465 struct vnode *a_vp; 1466 struct uio *a_uio; 1467 struct ucred *a_cred; 1468 int *a_eofflag; 1469 int *a_ncookies; 1470 u_long **a_cookies; 1471 } */ *ap; 1472 { 1473 int error = 0; 1474 int diff; 1475 long n; 1476 int blsize; 1477 long on; 1478 u_long cn; 1479 uint64_t fileno; 1480 u_long dirsperblk; 1481 long bias = 0; 1482 daddr_t bn, lbn; 1483 struct buf *bp; 1484 struct denode *dep = VTODE(ap->a_vp); 1485 struct msdosfsmount *pmp = dep->de_pmp; 1486 struct direntry *dentp; 1487 struct dirent dirbuf; 1488 struct uio *uio = ap->a_uio; 1489 u_long *cookies = NULL; 1490 int ncookies = 0; 1491 off_t offset, off; 1492 int chksum = -1; 1493 1494 #ifdef MSDOSFS_DEBUG 1495 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n", 1496 ap->a_vp, uio, ap->a_cred, ap->a_eofflag); 1497 #endif 1498 1499 /* 1500 * msdosfs_readdir() won't operate properly on regular files since 1501 * it does i/o only with the the filesystem vnode, and hence can 1502 * retrieve the wrong block from the buffer cache for a plain file. 1503 * So, fail attempts to readdir() on a plain file. 1504 */ 1505 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) 1506 return (ENOTDIR); 1507 1508 /* 1509 * To be safe, initialize dirbuf 1510 */ 1511 bzero(dirbuf.d_name, sizeof(dirbuf.d_name)); 1512 1513 /* 1514 * If the user buffer is smaller than the size of one dos directory 1515 * entry or the file offset is not a multiple of the size of a 1516 * directory entry, then we fail the read. 1517 */ 1518 off = offset = uio->uio_offset; 1519 if (uio->uio_resid < sizeof(struct direntry) || 1520 (offset & (sizeof(struct direntry) - 1))) 1521 return (EINVAL); 1522 1523 if (ap->a_ncookies) { 1524 ncookies = uio->uio_resid / 16; 1525 MALLOC(cookies, u_long *, ncookies * sizeof(u_long), M_TEMP, 1526 M_WAITOK); 1527 *ap->a_cookies = cookies; 1528 *ap->a_ncookies = ncookies; 1529 } 1530 1531 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 1532 1533 /* 1534 * If they are reading from the root directory then, we simulate 1535 * the . and .. entries since these don't exist in the root 1536 * directory. We also set the offset bias to make up for having to 1537 * simulate these entries. By this I mean that at file offset 64 we 1538 * read the first entry in the root directory that lives on disk. 1539 */ 1540 if (dep->de_StartCluster == MSDOSFSROOT 1541 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) { 1542 #if 0 1543 printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n", 1544 offset); 1545 #endif 1546 bias = 2 * sizeof(struct direntry); 1547 if (offset < bias) { 1548 for (n = (int)offset / sizeof(struct direntry); 1549 n < 2; n++) { 1550 if (FAT32(pmp)) 1551 fileno = (uint64_t)cntobn(pmp, 1552 pmp->pm_rootdirblk) 1553 * dirsperblk; 1554 else 1555 fileno = 1; 1556 #ifdef MSDOSFS_LARGE 1557 dirbuf.d_fileno = msdosfs_fileno_map( 1558 pmp->pm_mountp, fileno); 1559 #else 1560 dirbuf.d_fileno = (uint32_t)fileno; 1561 #endif 1562 dirbuf.d_type = DT_DIR; 1563 switch (n) { 1564 case 0: 1565 dirbuf.d_namlen = 1; 1566 strcpy(dirbuf.d_name, "."); 1567 break; 1568 case 1: 1569 dirbuf.d_namlen = 2; 1570 strcpy(dirbuf.d_name, ".."); 1571 break; 1572 } 1573 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1574 if (uio->uio_resid < dirbuf.d_reclen) 1575 goto out; 1576 error = uiomove(&dirbuf, dirbuf.d_reclen, uio); 1577 if (error) 1578 goto out; 1579 offset += sizeof(struct direntry); 1580 off = offset; 1581 if (cookies) { 1582 *cookies++ = offset; 1583 if (--ncookies <= 0) 1584 goto out; 1585 } 1586 } 1587 } 1588 } 1589 1590 mbnambuf_init(); 1591 off = offset; 1592 while (uio->uio_resid > 0) { 1593 lbn = de_cluster(pmp, offset - bias); 1594 on = (offset - bias) & pmp->pm_crbomask; 1595 n = min(pmp->pm_bpcluster - on, uio->uio_resid); 1596 diff = dep->de_FileSize - (offset - bias); 1597 if (diff <= 0) 1598 break; 1599 n = min(n, diff); 1600 error = pcbmap(dep, lbn, &bn, &cn, &blsize); 1601 if (error) 1602 break; 1603 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp); 1604 if (error) { 1605 brelse(bp); 1606 return (error); 1607 } 1608 n = min(n, blsize - bp->b_resid); 1609 if (n == 0) { 1610 brelse(bp); 1611 return (EIO); 1612 } 1613 1614 /* 1615 * Convert from dos directory entries to fs-independent 1616 * directory entries. 1617 */ 1618 for (dentp = (struct direntry *)(bp->b_data + on); 1619 (char *)dentp < bp->b_data + on + n; 1620 dentp++, offset += sizeof(struct direntry)) { 1621 #if 0 1622 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n", 1623 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes); 1624 #endif 1625 /* 1626 * If this is an unused entry, we can stop. 1627 */ 1628 if (dentp->deName[0] == SLOT_EMPTY) { 1629 brelse(bp); 1630 goto out; 1631 } 1632 /* 1633 * Skip deleted entries. 1634 */ 1635 if (dentp->deName[0] == SLOT_DELETED) { 1636 chksum = -1; 1637 mbnambuf_init(); 1638 continue; 1639 } 1640 1641 /* 1642 * Handle Win95 long directory entries 1643 */ 1644 if (dentp->deAttributes == ATTR_WIN95) { 1645 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) 1646 continue; 1647 chksum = win2unixfn((struct winentry *)dentp, 1648 chksum, pmp); 1649 continue; 1650 } 1651 1652 /* 1653 * Skip volume labels 1654 */ 1655 if (dentp->deAttributes & ATTR_VOLUME) { 1656 chksum = -1; 1657 mbnambuf_init(); 1658 continue; 1659 } 1660 /* 1661 * This computation of d_fileno must match 1662 * the computation of va_fileid in 1663 * msdosfs_getattr. 1664 */ 1665 if (dentp->deAttributes & ATTR_DIRECTORY) { 1666 fileno = getushort(dentp->deStartCluster); 1667 if (FAT32(pmp)) 1668 fileno |= getushort(dentp->deHighClust) << 16; 1669 /* if this is the root directory */ 1670 if (fileno == MSDOSFSROOT) 1671 if (FAT32(pmp)) 1672 fileno = (uint64_t)cntobn(pmp, 1673 pmp->pm_rootdirblk) 1674 * dirsperblk; 1675 else 1676 fileno = 1; 1677 else 1678 fileno = (uint64_t)cntobn(pmp, fileno) * 1679 dirsperblk; 1680 dirbuf.d_type = DT_DIR; 1681 } else { 1682 fileno = (uint64_t)offset / sizeof(struct direntry); 1683 dirbuf.d_type = DT_REG; 1684 } 1685 #ifdef MSDOSFS_LARGE 1686 dirbuf.d_fileno = msdosfs_fileno_map(pmp->pm_mountp, 1687 fileno); 1688 #else 1689 dirbuf.d_fileno = (uint32_t)fileno; 1690 #endif 1691 if (chksum != winChksum(dentp->deName)) { 1692 dirbuf.d_namlen = dos2unixfn(dentp->deName, 1693 (u_char *)dirbuf.d_name, 1694 dentp->deLowerCase | 1695 ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ? 1696 (LCASE_BASE | LCASE_EXT) : 0), 1697 pmp); 1698 mbnambuf_init(); 1699 } else 1700 mbnambuf_flush(&dirbuf); 1701 chksum = -1; 1702 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1703 if (uio->uio_resid < dirbuf.d_reclen) { 1704 brelse(bp); 1705 goto out; 1706 } 1707 error = uiomove(&dirbuf, dirbuf.d_reclen, uio); 1708 if (error) { 1709 brelse(bp); 1710 goto out; 1711 } 1712 if (cookies) { 1713 *cookies++ = offset + sizeof(struct direntry); 1714 if (--ncookies <= 0) { 1715 brelse(bp); 1716 goto out; 1717 } 1718 } 1719 off = offset + sizeof(struct direntry); 1720 } 1721 brelse(bp); 1722 } 1723 out: 1724 /* Subtract unused cookies */ 1725 if (ap->a_ncookies) 1726 *ap->a_ncookies -= ncookies; 1727 1728 uio->uio_offset = off; 1729 1730 /* 1731 * Set the eofflag (NFS uses it) 1732 */ 1733 if (ap->a_eofflag) { 1734 if (dep->de_FileSize - (offset - bias) <= 0) 1735 *ap->a_eofflag = 1; 1736 else 1737 *ap->a_eofflag = 0; 1738 } 1739 return (error); 1740 } 1741 1742 /* 1743 * vp - address of vnode file the file 1744 * bn - which cluster we are interested in mapping to a filesystem block number. 1745 * vpp - returns the vnode for the block special file holding the filesystem 1746 * containing the file of interest 1747 * bnp - address of where to return the filesystem relative block number 1748 */ 1749 static int 1750 msdosfs_bmap(ap) 1751 struct vop_bmap_args /* { 1752 struct vnode *a_vp; 1753 daddr_t a_bn; 1754 struct bufobj **a_bop; 1755 daddr_t *a_bnp; 1756 int *a_runp; 1757 int *a_runb; 1758 } */ *ap; 1759 { 1760 struct denode *dep = VTODE(ap->a_vp); 1761 daddr_t blkno; 1762 int error; 1763 1764 if (ap->a_bop != NULL) 1765 *ap->a_bop = &dep->de_pmp->pm_devvp->v_bufobj; 1766 if (ap->a_bnp == NULL) 1767 return (0); 1768 if (ap->a_runp) { 1769 /* 1770 * Sequential clusters should be counted here. 1771 */ 1772 *ap->a_runp = 0; 1773 } 1774 if (ap->a_runb) { 1775 *ap->a_runb = 0; 1776 } 1777 error = pcbmap(dep, ap->a_bn, &blkno, 0, 0); 1778 *ap->a_bnp = blkno; 1779 return (error); 1780 } 1781 1782 static int 1783 msdosfs_strategy(ap) 1784 struct vop_strategy_args /* { 1785 struct vnode *a_vp; 1786 struct buf *a_bp; 1787 } */ *ap; 1788 { 1789 struct buf *bp = ap->a_bp; 1790 struct denode *dep = VTODE(ap->a_vp); 1791 struct bufobj *bo; 1792 int error = 0; 1793 daddr_t blkno; 1794 1795 /* 1796 * If we don't already know the filesystem relative block number 1797 * then get it using pcbmap(). If pcbmap() returns the block 1798 * number as -1 then we've got a hole in the file. DOS filesystems 1799 * don't allow files with holes, so we shouldn't ever see this. 1800 */ 1801 if (bp->b_blkno == bp->b_lblkno) { 1802 error = pcbmap(dep, bp->b_lblkno, &blkno, 0, 0); 1803 bp->b_blkno = blkno; 1804 if (error) { 1805 bp->b_error = error; 1806 bp->b_ioflags |= BIO_ERROR; 1807 bufdone(bp); 1808 return (error); 1809 } 1810 if ((long)bp->b_blkno == -1) 1811 vfs_bio_clrbuf(bp); 1812 } 1813 if (bp->b_blkno == -1) { 1814 bufdone(bp); 1815 return (0); 1816 } 1817 /* 1818 * Read/write the block from/to the disk that contains the desired 1819 * file block. 1820 */ 1821 bp->b_iooffset = dbtob(bp->b_blkno); 1822 bo = dep->de_pmp->pm_bo; 1823 BO_STRATEGY(bo, bp); 1824 return (0); 1825 } 1826 1827 static int 1828 msdosfs_print(ap) 1829 struct vop_print_args /* { 1830 struct vnode *vp; 1831 } */ *ap; 1832 { 1833 struct denode *dep = VTODE(ap->a_vp); 1834 1835 printf("\tstartcluster %lu, dircluster %lu, diroffset %lu, ", 1836 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset); 1837 printf("on dev %s\n", devtoname(dep->de_dev)); 1838 return (0); 1839 } 1840 1841 static int 1842 msdosfs_pathconf(ap) 1843 struct vop_pathconf_args /* { 1844 struct vnode *a_vp; 1845 int a_name; 1846 int *a_retval; 1847 } */ *ap; 1848 { 1849 struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp; 1850 1851 switch (ap->a_name) { 1852 case _PC_LINK_MAX: 1853 *ap->a_retval = 1; 1854 return (0); 1855 case _PC_NAME_MAX: 1856 *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12; 1857 return (0); 1858 case _PC_PATH_MAX: 1859 *ap->a_retval = PATH_MAX; 1860 return (0); 1861 case _PC_CHOWN_RESTRICTED: 1862 *ap->a_retval = 1; 1863 return (0); 1864 case _PC_NO_TRUNC: 1865 *ap->a_retval = 0; 1866 return (0); 1867 default: 1868 return (EINVAL); 1869 } 1870 /* NOTREACHED */ 1871 } 1872 1873 static int 1874 msdosfs_advlock(ap) 1875 struct vop_advlock_args /* { 1876 struct vnode *a_vp; 1877 u_char a_id; 1878 int a_op; 1879 struct flock *a_fl; 1880 int a_flags; 1881 } */ *ap; 1882 { 1883 struct denode *dep = VTODE(ap->a_vp); 1884 1885 return (lf_advlock(ap, &dep->de_lockf, dep->de_FileSize)); 1886 } 1887 1888 /* Global vfs data structures for msdosfs */ 1889 struct vop_vector msdosfs_vnodeops = { 1890 .vop_default = &default_vnodeops, 1891 1892 .vop_access = msdosfs_access, 1893 .vop_advlock = msdosfs_advlock, 1894 .vop_bmap = msdosfs_bmap, 1895 .vop_cachedlookup = msdosfs_lookup, 1896 .vop_open = msdosfs_open, 1897 .vop_close = msdosfs_close, 1898 .vop_create = msdosfs_create, 1899 .vop_fsync = msdosfs_fsync, 1900 .vop_getattr = msdosfs_getattr, 1901 .vop_inactive = msdosfs_inactive, 1902 .vop_link = msdosfs_link, 1903 .vop_lookup = vfs_cache_lookup, 1904 .vop_mkdir = msdosfs_mkdir, 1905 .vop_mknod = msdosfs_mknod, 1906 .vop_pathconf = msdosfs_pathconf, 1907 .vop_print = msdosfs_print, 1908 .vop_read = msdosfs_read, 1909 .vop_readdir = msdosfs_readdir, 1910 .vop_reclaim = msdosfs_reclaim, 1911 .vop_remove = msdosfs_remove, 1912 .vop_rename = msdosfs_rename, 1913 .vop_rmdir = msdosfs_rmdir, 1914 .vop_setattr = msdosfs_setattr, 1915 .vop_strategy = msdosfs_strategy, 1916 .vop_symlink = msdosfs_symlink, 1917 .vop_write = msdosfs_write, 1918 };
Cache object: dec14d2d4b0c853edf93b0fee3b5e025
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