1 /* $NetBSD: msdosfs_vnops.c,v 1.2 2003/02/25 10:29:12 jdolecek Exp $ */ 2 3 /*- 4 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. 5 * Copyright (C) 1994, 1995, 1997 TooLs GmbH. 6 * All rights reserved. 7 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by TooLs GmbH. 20 * 4. The name of TooLs GmbH may not be used to endorse or promote products 21 * derived from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 27 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 28 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 29 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 30 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 31 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 32 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 /* 35 * Written by Paul Popelka (paulp@uts.amdahl.com) 36 * 37 * You can do anything you want with this software, just don't say you wrote 38 * it, and don't remove this notice. 39 * 40 * This software is provided "as is". 41 * 42 * The author supplies this software to be publicly redistributed on the 43 * understanding that the author is not responsible for the correct 44 * functioning of this software in any circumstances and is not liable for 45 * any damages caused by this software. 46 * 47 * October 1992 48 */ 49 50 #include <sys/cdefs.h> 51 __KERNEL_RCSID(0, "$NetBSD: msdosfs_vnops.c,v 1.2 2003/02/25 10:29:12 jdolecek Exp $"); 52 53 #include <sys/param.h> 54 #include <sys/systm.h> 55 #include <sys/namei.h> 56 #include <sys/resourcevar.h> /* defines plimit structure in proc struct */ 57 #include <sys/kernel.h> 58 #include <sys/file.h> /* define FWRITE ... */ 59 #include <sys/stat.h> 60 #include <sys/buf.h> 61 #include <sys/proc.h> 62 #include <sys/mount.h> 63 #include <sys/vnode.h> 64 #include <sys/signalvar.h> 65 #include <sys/malloc.h> 66 #include <sys/dirent.h> 67 #include <sys/lockf.h> 68 69 #include <miscfs/genfs/genfs.h> 70 #include <miscfs/specfs/specdev.h> /* XXX */ /* defines v_rdev */ 71 72 #include <uvm/uvm_extern.h> 73 74 #include <fs/msdosfs/bpb.h> 75 #include <fs/msdosfs/direntry.h> 76 #include <fs/msdosfs/denode.h> 77 #include <fs/msdosfs/msdosfsmount.h> 78 #include <fs/msdosfs/fat.h> 79 80 /* 81 * Some general notes: 82 * 83 * In the ufs filesystem the inodes, superblocks, and indirect blocks are 84 * read/written using the vnode for the filesystem. Blocks that represent 85 * the contents of a file are read/written using the vnode for the file 86 * (including directories when they are read/written as files). This 87 * presents problems for the dos filesystem because data that should be in 88 * an inode (if dos had them) resides in the directory itself. Since we 89 * must update directory entries without the benefit of having the vnode 90 * for the directory we must use the vnode for the filesystem. This means 91 * that when a directory is actually read/written (via read, write, or 92 * readdir, or seek) we must use the vnode for the filesystem instead of 93 * the vnode for the directory as would happen in ufs. This is to insure we 94 * retrieve the correct block from the buffer cache since the hash value is 95 * based upon the vnode address and the desired block number. 96 */ 97 98 /* 99 * Create a regular file. On entry the directory to contain the file being 100 * created is locked. We must release before we return. We must also free 101 * the pathname buffer pointed at by cnp->cn_pnbuf, always on error, or 102 * only if the SAVESTART bit in cn_flags is clear on success. 103 */ 104 int 105 msdosfs_create(v) 106 void *v; 107 { 108 struct vop_create_args /* { 109 struct vnode *a_dvp; 110 struct vnode **a_vpp; 111 struct componentname *a_cnp; 112 struct vattr *a_vap; 113 } */ *ap = v; 114 struct componentname *cnp = ap->a_cnp; 115 struct denode ndirent; 116 struct denode *dep; 117 struct denode *pdep = VTODE(ap->a_dvp); 118 int error; 119 struct timespec ts; 120 121 #ifdef MSDOSFS_DEBUG 122 printf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap); 123 #endif 124 125 /* 126 * If this is the root directory and there is no space left we 127 * can't do anything. This is because the root directory can not 128 * change size. 129 */ 130 if (pdep->de_StartCluster == MSDOSFSROOT 131 && pdep->de_fndoffset >= pdep->de_FileSize) { 132 error = ENOSPC; 133 goto bad; 134 } 135 136 /* 137 * Create a directory entry for the file, then call createde() to 138 * have it installed. NOTE: DOS files are always executable. We 139 * use the absence of the owner write bit to make the file 140 * readonly. 141 */ 142 #ifdef DIAGNOSTIC 143 if ((cnp->cn_flags & HASBUF) == 0) 144 panic("msdosfs_create: no name"); 145 #endif 146 memset(&ndirent, 0, sizeof(ndirent)); 147 if ((error = uniqdosname(pdep, cnp, ndirent.de_Name)) != 0) 148 goto bad; 149 150 ndirent.de_Attributes = (ap->a_vap->va_mode & S_IWUSR) ? 151 ATTR_ARCHIVE : ATTR_ARCHIVE | ATTR_READONLY; 152 ndirent.de_StartCluster = 0; 153 ndirent.de_FileSize = 0; 154 ndirent.de_dev = pdep->de_dev; 155 ndirent.de_devvp = pdep->de_devvp; 156 ndirent.de_pmp = pdep->de_pmp; 157 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 158 TIMEVAL_TO_TIMESPEC(&time, &ts); 159 DETIMES(&ndirent, &ts, &ts, &ts); 160 if ((error = createde(&ndirent, pdep, &dep, cnp)) != 0) 161 goto bad; 162 if ((cnp->cn_flags & SAVESTART) == 0) 163 PNBUF_PUT(cnp->cn_pnbuf); 164 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 165 vput(ap->a_dvp); 166 *ap->a_vpp = DETOV(dep); 167 return (0); 168 169 bad: 170 PNBUF_PUT(cnp->cn_pnbuf); 171 vput(ap->a_dvp); 172 return (error); 173 } 174 175 int 176 msdosfs_mknod(v) 177 void *v; 178 { 179 struct vop_mknod_args /* { 180 struct vnode *a_dvp; 181 struct vnode **a_vpp; 182 struct componentname *a_cnp; 183 struct vattr *a_vap; 184 } */ *ap = v; 185 186 PNBUF_PUT(ap->a_cnp->cn_pnbuf); 187 vput(ap->a_dvp); 188 return (EINVAL); 189 } 190 191 int 192 msdosfs_open(v) 193 void *v; 194 { 195 #if 0 196 struct vop_open_args /* { 197 struct vnode *a_vp; 198 int a_mode; 199 struct ucred *a_cred; 200 struct proc *a_p; 201 } */ *ap; 202 #endif 203 204 return (0); 205 } 206 207 int 208 msdosfs_close(v) 209 void *v; 210 { 211 struct vop_close_args /* { 212 struct vnode *a_vp; 213 int a_fflag; 214 struct ucred *a_cred; 215 struct proc *a_p; 216 } */ *ap = v; 217 struct vnode *vp = ap->a_vp; 218 struct denode *dep = VTODE(vp); 219 struct timespec ts; 220 221 simple_lock(&vp->v_interlock); 222 if (vp->v_usecount > 1) { 223 TIMEVAL_TO_TIMESPEC(&time, &ts); 224 DETIMES(dep, &ts, &ts, &ts); 225 } 226 simple_unlock(&vp->v_interlock); 227 return (0); 228 } 229 230 int 231 msdosfs_access(v) 232 void *v; 233 { 234 struct vop_access_args /* { 235 struct vnode *a_vp; 236 int a_mode; 237 struct ucred *a_cred; 238 struct proc *a_p; 239 } */ *ap = v; 240 struct vnode *vp = ap->a_vp; 241 struct denode *dep = VTODE(vp); 242 struct msdosfsmount *pmp = dep->de_pmp; 243 mode_t mode = ap->a_mode; 244 245 /* 246 * Disallow write attempts on read-only file systems; 247 * unless the file is a socket, fifo, or a block or 248 * character device resident on the file system. 249 */ 250 if (mode & VWRITE) { 251 switch (vp->v_type) { 252 case VDIR: 253 case VLNK: 254 case VREG: 255 if (vp->v_mount->mnt_flag & MNT_RDONLY) 256 return (EROFS); 257 default: 258 break; 259 } 260 } 261 262 if ((dep->de_Attributes & ATTR_READONLY) == 0) 263 mode = S_IRWXU|S_IRWXG|S_IRWXO; 264 else 265 mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 266 return (vaccess(ap->a_vp->v_type, mode & pmp->pm_mask, 267 pmp->pm_uid, pmp->pm_gid, ap->a_mode, ap->a_cred)); 268 } 269 270 int 271 msdosfs_getattr(v) 272 void *v; 273 { 274 struct vop_getattr_args /* { 275 struct vnode *a_vp; 276 struct vattr *a_vap; 277 struct ucred *a_cred; 278 struct proc *a_p; 279 } */ *ap = v; 280 struct denode *dep = VTODE(ap->a_vp); 281 struct msdosfsmount *pmp = dep->de_pmp; 282 struct vattr *vap = ap->a_vap; 283 mode_t mode; 284 struct timespec ts; 285 u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 286 u_long fileid; 287 288 TIMEVAL_TO_TIMESPEC(&time, &ts); 289 DETIMES(dep, &ts, &ts, &ts); 290 vap->va_fsid = dep->de_dev; 291 /* 292 * The following computation of the fileid must be the same as that 293 * used in msdosfs_readdir() to compute d_fileno. If not, pwd 294 * doesn't work. 295 */ 296 if (dep->de_Attributes & ATTR_DIRECTORY) { 297 fileid = cntobn(pmp, dep->de_StartCluster) * dirsperblk; 298 if (dep->de_StartCluster == MSDOSFSROOT) 299 fileid = 1; 300 } else { 301 fileid = cntobn(pmp, dep->de_dirclust) * dirsperblk; 302 if (dep->de_dirclust == MSDOSFSROOT) 303 fileid = roottobn(pmp, 0) * dirsperblk; 304 fileid += dep->de_diroffset / sizeof(struct direntry); 305 } 306 vap->va_fileid = fileid; 307 if ((dep->de_Attributes & ATTR_READONLY) == 0) 308 mode = S_IRWXU|S_IRWXG|S_IRWXO; 309 else 310 mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 311 vap->va_mode = mode & pmp->pm_mask; 312 vap->va_uid = pmp->pm_uid; 313 vap->va_gid = pmp->pm_gid; 314 vap->va_nlink = 1; 315 vap->va_rdev = 0; 316 vap->va_size = ap->a_vp->v_size; 317 dos2unixtime(dep->de_MDate, dep->de_MTime, 0, &vap->va_mtime); 318 if (dep->de_pmp->pm_flags & MSDOSFSMNT_LONGNAME) { 319 dos2unixtime(dep->de_ADate, 0, 0, &vap->va_atime); 320 dos2unixtime(dep->de_CDate, dep->de_CTime, dep->de_CHun, &vap->va_ctime); 321 } else { 322 vap->va_atime = vap->va_mtime; 323 vap->va_ctime = vap->va_mtime; 324 } 325 vap->va_flags = 0; 326 if ((dep->de_Attributes & ATTR_ARCHIVE) == 0) 327 vap->va_mode |= S_ARCH1; 328 vap->va_gen = 0; 329 vap->va_blocksize = pmp->pm_bpcluster; 330 vap->va_bytes = 331 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask; 332 vap->va_type = ap->a_vp->v_type; 333 return (0); 334 } 335 336 int 337 msdosfs_setattr(v) 338 void *v; 339 { 340 struct vop_setattr_args /* { 341 struct vnode *a_vp; 342 struct vattr *a_vap; 343 struct ucred *a_cred; 344 struct proc *a_p; 345 } */ *ap = v; 346 int error = 0, de_changed = 0; 347 struct denode *dep = VTODE(ap->a_vp); 348 struct msdosfsmount *pmp = dep->de_pmp; 349 struct vnode *vp = ap->a_vp; 350 struct vattr *vap = ap->a_vap; 351 struct ucred *cred = ap->a_cred; 352 353 #ifdef MSDOSFS_DEBUG 354 printf("msdosfs_setattr(): vp %p, vap %p, cred %p, p %p\n", 355 ap->a_vp, vap, cred, ap->a_p); 356 #endif 357 /* 358 * Note we silently ignore uid or gid changes. 359 */ 360 if ((vap->va_type != VNON) || (vap->va_nlink != (nlink_t)VNOVAL) || 361 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 362 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 363 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL) || 364 (vap->va_uid != VNOVAL && vap->va_uid != pmp->pm_uid) || 365 (vap->va_gid != VNOVAL && vap->va_gid != pmp->pm_gid)) { 366 #ifdef MSDOSFS_DEBUG 367 printf("msdosfs_setattr(): returning EINVAL\n"); 368 printf(" va_type %d, va_nlink %x, va_fsid %lx, va_fileid %lx\n", 369 vap->va_type, vap->va_nlink, vap->va_fsid, vap->va_fileid); 370 printf(" va_blocksize %lx, va_rdev %x, va_bytes %qx, va_gen %lx\n", 371 vap->va_blocksize, vap->va_rdev, (long long)vap->va_bytes, vap->va_gen); 372 #endif 373 return (EINVAL); 374 } 375 /* 376 * Silently ignore attributes modifications on directories. 377 */ 378 if (ap->a_vp->v_type == VDIR) 379 return 0; 380 381 if (vap->va_size != VNOVAL) { 382 if (vp->v_mount->mnt_flag & MNT_RDONLY) 383 return (EROFS); 384 error = detrunc(dep, (u_long)vap->va_size, 0, cred, ap->a_p); 385 if (error) 386 return (error); 387 de_changed = 1; 388 } 389 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 390 if (vp->v_mount->mnt_flag & MNT_RDONLY) 391 return (EROFS); 392 if (cred->cr_uid != pmp->pm_uid && 393 (error = suser(cred, &ap->a_p->p_acflag)) && 394 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 395 (error = VOP_ACCESS(ap->a_vp, VWRITE, cred, ap->a_p)))) 396 return (error); 397 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 && 398 vap->va_atime.tv_sec != VNOVAL) 399 unix2dostime(&vap->va_atime, &dep->de_ADate, NULL, NULL); 400 if (vap->va_mtime.tv_sec != VNOVAL) 401 unix2dostime(&vap->va_mtime, &dep->de_MDate, &dep->de_MTime, NULL); 402 dep->de_Attributes |= ATTR_ARCHIVE; 403 dep->de_flag |= DE_MODIFIED; 404 de_changed = 1; 405 } 406 /* 407 * DOS files only have the ability to have their writability 408 * attribute set, so we use the owner write bit to set the readonly 409 * attribute. 410 */ 411 if (vap->va_mode != (mode_t)VNOVAL) { 412 if (vp->v_mount->mnt_flag & MNT_RDONLY) 413 return (EROFS); 414 if (cred->cr_uid != pmp->pm_uid && 415 (error = suser(cred, &ap->a_p->p_acflag))) 416 return (error); 417 /* We ignore the read and execute bits. */ 418 if (vap->va_mode & S_IWUSR) 419 dep->de_Attributes &= ~ATTR_READONLY; 420 else 421 dep->de_Attributes |= ATTR_READONLY; 422 dep->de_flag |= DE_MODIFIED; 423 de_changed = 1; 424 } 425 /* 426 * Allow the `archived' bit to be toggled. 427 */ 428 if (vap->va_flags != VNOVAL) { 429 if (vp->v_mount->mnt_flag & MNT_RDONLY) 430 return (EROFS); 431 if (cred->cr_uid != pmp->pm_uid && 432 (error = suser(cred, &ap->a_p->p_acflag))) 433 return (error); 434 if (vap->va_flags & SF_ARCHIVED) 435 dep->de_Attributes &= ~ATTR_ARCHIVE; 436 else 437 dep->de_Attributes |= ATTR_ARCHIVE; 438 dep->de_flag |= DE_MODIFIED; 439 de_changed = 1; 440 } 441 442 if (de_changed) { 443 VN_KNOTE(vp, NOTE_ATTRIB); 444 return (deupdat(dep, 1)); 445 } else 446 return (0); 447 } 448 449 int 450 msdosfs_read(v) 451 void *v; 452 { 453 struct vop_read_args /* { 454 struct vnode *a_vp; 455 struct uio *a_uio; 456 int a_ioflag; 457 struct ucred *a_cred; 458 } */ *ap = v; 459 int error = 0; 460 int64_t diff; 461 int blsize; 462 long n; 463 long on; 464 daddr_t lbn; 465 void *win; 466 vsize_t bytelen; 467 struct buf *bp; 468 struct vnode *vp = ap->a_vp; 469 struct denode *dep = VTODE(vp); 470 struct msdosfsmount *pmp = dep->de_pmp; 471 struct uio *uio = ap->a_uio; 472 473 /* 474 * If they didn't ask for any data, then we are done. 475 */ 476 477 if (uio->uio_resid == 0) 478 return (0); 479 if (uio->uio_offset < 0) 480 return (EINVAL); 481 if (uio->uio_offset >= dep->de_FileSize) 482 return (0); 483 484 if (vp->v_type == VREG) { 485 while (uio->uio_resid > 0) { 486 bytelen = MIN(dep->de_FileSize - uio->uio_offset, 487 uio->uio_resid); 488 489 if (bytelen == 0) 490 break; 491 win = ubc_alloc(&vp->v_uobj, uio->uio_offset, 492 &bytelen, UBC_READ); 493 error = uiomove(win, bytelen, uio); 494 ubc_release(win, 0); 495 if (error) 496 break; 497 } 498 dep->de_flag |= DE_ACCESS; 499 goto out; 500 } 501 502 /* this loop is only for directories now */ 503 do { 504 lbn = de_cluster(pmp, uio->uio_offset); 505 on = uio->uio_offset & pmp->pm_crbomask; 506 n = MIN(pmp->pm_bpcluster - on, uio->uio_resid); 507 if (uio->uio_offset >= dep->de_FileSize) 508 return (0); 509 /* file size (and hence diff) may be up to 4GB */ 510 diff = dep->de_FileSize - uio->uio_offset; 511 if (diff < n) 512 n = (long) diff; 513 514 /* convert cluster # to block # */ 515 error = pcbmap(dep, lbn, &lbn, 0, &blsize); 516 if (error) 517 return (error); 518 519 /* 520 * If we are operating on a directory file then be sure to 521 * do i/o with the vnode for the filesystem instead of the 522 * vnode for the directory. 523 */ 524 error = bread(pmp->pm_devvp, lbn, blsize, NOCRED, &bp); 525 n = MIN(n, pmp->pm_bpcluster - bp->b_resid); 526 if (error) { 527 brelse(bp); 528 return (error); 529 } 530 error = uiomove(bp->b_data + on, (int) n, uio); 531 brelse(bp); 532 } while (error == 0 && uio->uio_resid > 0 && n != 0); 533 534 out: 535 if ((ap->a_ioflag & IO_SYNC) == IO_SYNC) 536 error = deupdat(dep, 1); 537 return (error); 538 } 539 540 /* 541 * Write data to a file or directory. 542 */ 543 int 544 msdosfs_write(v) 545 void *v; 546 { 547 struct vop_write_args /* { 548 struct vnode *a_vp; 549 struct uio *a_uio; 550 int a_ioflag; 551 struct ucred *a_cred; 552 } */ *ap = v; 553 int resid; 554 u_long osize; 555 int error = 0; 556 u_long count; 557 int ioflag = ap->a_ioflag; 558 void *win; 559 vsize_t bytelen; 560 off_t oldoff; 561 struct uio *uio = ap->a_uio; 562 struct proc *p = uio->uio_procp; 563 struct vnode *vp = ap->a_vp; 564 struct denode *dep = VTODE(vp); 565 struct msdosfsmount *pmp = dep->de_pmp; 566 struct ucred *cred = ap->a_cred; 567 boolean_t async; 568 int extended=0; 569 570 #ifdef MSDOSFS_DEBUG 571 printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n", 572 vp, uio, ioflag, cred); 573 printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n", 574 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster); 575 #endif 576 577 switch (vp->v_type) { 578 case VREG: 579 if (ioflag & IO_APPEND) 580 uio->uio_offset = dep->de_FileSize; 581 break; 582 case VDIR: 583 return EISDIR; 584 default: 585 panic("msdosfs_write(): bad file type"); 586 } 587 588 if (uio->uio_offset < 0) 589 return (EINVAL); 590 591 if (uio->uio_resid == 0) 592 return (0); 593 594 /* 595 * If they've exceeded their filesize limit, tell them about it. 596 */ 597 if (p && 598 ((uio->uio_offset + uio->uio_resid) > 599 p->p_rlimit[RLIMIT_FSIZE].rlim_cur)) { 600 psignal(p, SIGXFSZ); 601 return (EFBIG); 602 } 603 604 /* 605 * If the offset we are starting the write at is beyond the end of 606 * the file, then they've done a seek. Unix filesystems allow 607 * files with holes in them, DOS doesn't so we must fill the hole 608 * with zeroed blocks. 609 */ 610 if (uio->uio_offset > dep->de_FileSize) { 611 if ((error = deextend(dep, uio->uio_offset, cred)) != 0) 612 return (error); 613 } 614 615 /* 616 * Remember some values in case the write fails. 617 */ 618 async = vp->v_mount->mnt_flag & MNT_ASYNC; 619 resid = uio->uio_resid; 620 osize = dep->de_FileSize; 621 622 /* 623 * If we write beyond the end of the file, extend it to its ultimate 624 * size ahead of the time to hopefully get a contiguous area. 625 */ 626 if (uio->uio_offset + resid > osize) { 627 count = de_clcount(pmp, uio->uio_offset + resid) - 628 de_clcount(pmp, osize); 629 if ((error = extendfile(dep, count, NULL, NULL, 0)) && 630 (error != ENOSPC || (ioflag & IO_UNIT))) 631 goto errexit; 632 } 633 634 if (dep->de_FileSize < uio->uio_offset + resid) { 635 dep->de_FileSize = uio->uio_offset + resid; 636 uvm_vnp_setsize(vp, dep->de_FileSize); 637 extended = 1; 638 } 639 640 do { 641 oldoff = uio->uio_offset; 642 bytelen = uio->uio_resid; 643 644 win = ubc_alloc(&vp->v_uobj, oldoff, &bytelen, UBC_WRITE); 645 error = uiomove(win, bytelen, uio); 646 ubc_release(win, 0); 647 if (error) { 648 break; 649 } 650 651 /* 652 * flush what we just wrote if necessary. 653 * XXXUBC simplistic async flushing. 654 */ 655 656 if (!async && oldoff >> 16 != uio->uio_offset >> 16) { 657 simple_lock(&vp->v_interlock); 658 error = VOP_PUTPAGES(vp, (oldoff >> 16) << 16, 659 (uio->uio_offset >> 16) << 16, PGO_CLEANIT); 660 } 661 } while (error == 0 && uio->uio_resid > 0); 662 if (error == 0 && ioflag & IO_SYNC) { 663 simple_lock(&vp->v_interlock); 664 error = VOP_PUTPAGES(vp, trunc_page(oldoff), 665 round_page(oldoff + bytelen), PGO_CLEANIT | PGO_SYNCIO); 666 } 667 dep->de_flag |= DE_UPDATE; 668 669 /* 670 * If the write failed and they want us to, truncate the file back 671 * to the size it was before the write was attempted. 672 */ 673 errexit: 674 if (resid > uio->uio_resid) 675 VN_KNOTE(vp, NOTE_WRITE | (extended ? NOTE_EXTEND : 0)); 676 if (error) { 677 detrunc(dep, osize, ioflag & IO_SYNC, NOCRED, NULL); 678 uio->uio_offset -= resid - uio->uio_resid; 679 uio->uio_resid = resid; 680 } else if ((ioflag & IO_SYNC) == IO_SYNC) 681 error = deupdat(dep, 1); 682 KASSERT(vp->v_size == dep->de_FileSize); 683 return (error); 684 } 685 686 int 687 msdosfs_update(v) 688 void *v; 689 { 690 struct vop_update_args /* { 691 struct vnode *a_vp; 692 struct timespec *a_access; 693 struct timespec *a_modify; 694 int a_flags; 695 } */ *ap = v; 696 struct buf *bp; 697 struct direntry *dirp; 698 struct denode *dep; 699 int error; 700 struct timespec ts; 701 702 if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY) 703 return (0); 704 dep = VTODE(ap->a_vp); 705 TIMEVAL_TO_TIMESPEC(&time, &ts); 706 DETIMES(dep, 707 ap->a_access ? ap->a_access : &ts, 708 ap->a_modify ? ap->a_modify : &ts, &ts); 709 if ((dep->de_flag & DE_MODIFIED) == 0) 710 return (0); 711 dep->de_flag &= ~DE_MODIFIED; 712 if (dep->de_Attributes & ATTR_DIRECTORY) 713 return (0); 714 if (dep->de_refcnt <= 0) 715 return (0); 716 error = readde(dep, &bp, &dirp); 717 if (error) 718 return (error); 719 DE_EXTERNALIZE(dirp, dep); 720 if (ap->a_flags & (UPDATE_WAIT|UPDATE_DIROP)) 721 return (bwrite(bp)); 722 else { 723 bdwrite(bp); 724 return (0); 725 } 726 } 727 728 /* 729 * Flush the blocks of a file to disk. 730 * 731 * This function is worthless for vnodes that represent directories. Maybe we 732 * could just do a sync if they try an fsync on a directory file. 733 */ 734 int 735 msdosfs_remove(v) 736 void *v; 737 { 738 struct vop_remove_args /* { 739 struct vnode *a_dvp; 740 struct vnode *a_vp; 741 struct componentname *a_cnp; 742 } */ *ap = v; 743 struct denode *dep = VTODE(ap->a_vp); 744 struct denode *ddep = VTODE(ap->a_dvp); 745 int error; 746 747 if (ap->a_vp->v_type == VDIR) 748 error = EPERM; 749 else 750 error = removede(ddep, dep); 751 #ifdef MSDOSFS_DEBUG 752 printf("msdosfs_remove(), dep %p, v_usecount %d\n", 753 dep, ap->a_vp->v_usecount); 754 #endif 755 VN_KNOTE(ap->a_vp, NOTE_DELETE); 756 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 757 if (ddep == dep) 758 vrele(ap->a_vp); 759 else 760 vput(ap->a_vp); /* causes msdosfs_inactive() to be called 761 * via vrele() */ 762 vput(ap->a_dvp); 763 return (error); 764 } 765 766 /* 767 * DOS filesystems don't know what links are. But since we already called 768 * msdosfs_lookup() with create and lockparent, the parent is locked so we 769 * have to free it before we return the error. 770 */ 771 int 772 msdosfs_link(v) 773 void *v; 774 { 775 struct vop_link_args /* { 776 struct vnode *a_dvp; 777 struct vnode *a_vp; 778 struct componentname *a_cnp; 779 } */ *ap = v; 780 781 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 782 vput(ap->a_dvp); 783 return (EOPNOTSUPP); 784 } 785 786 /* 787 * Renames on files require moving the denode to a new hash queue since the 788 * denode's location is used to compute which hash queue to put the file 789 * in. Unless it is a rename in place. For example "mv a b". 790 * 791 * What follows is the basic algorithm: 792 * 793 * if (file move) { 794 * if (dest file exists) { 795 * remove dest file 796 * } 797 * if (dest and src in same directory) { 798 * rewrite name in existing directory slot 799 * } else { 800 * write new entry in dest directory 801 * update offset and dirclust in denode 802 * move denode to new hash chain 803 * clear old directory entry 804 * } 805 * } else { 806 * directory move 807 * if (dest directory exists) { 808 * if (dest is not empty) { 809 * return ENOTEMPTY 810 * } 811 * remove dest directory 812 * } 813 * if (dest and src in same directory) { 814 * rewrite name in existing entry 815 * } else { 816 * be sure dest is not a child of src directory 817 * write entry in dest directory 818 * update "." and ".." in moved directory 819 * update offset and dirclust in denode 820 * move denode to new hash chain 821 * clear old directory entry for moved directory 822 * } 823 * } 824 * 825 * On entry: 826 * source's parent directory is unlocked 827 * source file or directory is unlocked 828 * destination's parent directory is locked 829 * destination file or directory is locked if it exists 830 * 831 * On exit: 832 * all denodes should be released 833 * 834 * Notes: 835 * I'm not sure how the memory containing the pathnames pointed at by the 836 * componentname structures is freed, there may be some memory bleeding 837 * for each rename done. 838 */ 839 int 840 msdosfs_rename(v) 841 void *v; 842 { 843 struct vop_rename_args /* { 844 struct vnode *a_fdvp; 845 struct vnode *a_fvp; 846 struct componentname *a_fcnp; 847 struct vnode *a_tdvp; 848 struct vnode *a_tvp; 849 struct componentname *a_tcnp; 850 } */ *ap = v; 851 struct vnode *tvp = ap->a_tvp; 852 struct vnode *tdvp = ap->a_tdvp; 853 struct vnode *fvp = ap->a_fvp; 854 struct vnode *fdvp = ap->a_fdvp; 855 struct componentname *tcnp = ap->a_tcnp; 856 struct componentname *fcnp = ap->a_fcnp; 857 struct proc *p = tcnp->cn_proc; 858 struct denode *ip, *xp, *dp, *zp; 859 u_char toname[11], oldname[11]; 860 u_long from_diroffset, to_diroffset; 861 u_char to_count; 862 int doingdirectory = 0, newparent = 0; 863 int error; 864 u_long cn; 865 daddr_t bn; 866 struct msdosfsmount *pmp; 867 struct direntry *dotdotp; 868 struct buf *bp; 869 int fdvp_dorele = 0; 870 871 pmp = VFSTOMSDOSFS(fdvp->v_mount); 872 873 #ifdef DIAGNOSTIC 874 if ((tcnp->cn_flags & HASBUF) == 0 || 875 (fcnp->cn_flags & HASBUF) == 0) 876 panic("msdosfs_rename: no name"); 877 #endif 878 /* 879 * Check for cross-device rename. 880 */ 881 if ((fvp->v_mount != tdvp->v_mount) || 882 (tvp && (fvp->v_mount != tvp->v_mount))) { 883 error = EXDEV; 884 abortit: 885 VOP_ABORTOP(tdvp, tcnp); 886 if (tdvp == tvp) 887 vrele(tdvp); 888 else 889 vput(tdvp); 890 if (tvp) 891 vput(tvp); 892 VOP_ABORTOP(fdvp, fcnp); 893 vrele(fdvp); 894 vrele(fvp); 895 return (error); 896 } 897 898 /* 899 * If source and dest are the same, do nothing. 900 */ 901 if (tvp == fvp) { 902 error = 0; 903 goto abortit; 904 } 905 906 /* */ 907 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0) 908 goto abortit; 909 dp = VTODE(fdvp); 910 ip = VTODE(fvp); 911 912 /* 913 * Be sure we are not renaming ".", "..", or an alias of ".". This 914 * leads to a crippled directory tree. It's pretty tough to do a 915 * "ls" or "pwd" with the "." directory entry missing, and "cd .." 916 * doesn't work if the ".." entry is missing. 917 */ 918 if (ip->de_Attributes & ATTR_DIRECTORY) { 919 /* 920 * Avoid ".", "..", and aliases of "." for obvious reasons. 921 */ 922 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 923 dp == ip || 924 (fcnp->cn_flags & ISDOTDOT) || 925 (tcnp->cn_flags & ISDOTDOT) || 926 (ip->de_flag & DE_RENAME)) { 927 VOP_UNLOCK(fvp, 0); 928 error = EINVAL; 929 goto abortit; 930 } 931 ip->de_flag |= DE_RENAME; 932 doingdirectory++; 933 } 934 VN_KNOTE(fdvp, NOTE_WRITE); /* XXXLUKEM/XXX: right place? */ 935 936 /* 937 * When the target exists, both the directory 938 * and target vnodes are returned locked. 939 */ 940 dp = VTODE(tdvp); 941 xp = tvp ? VTODE(tvp) : NULL; 942 /* 943 * Remember direntry place to use for destination 944 */ 945 to_diroffset = dp->de_fndoffset; 946 to_count = dp->de_fndcnt; 947 948 /* 949 * If ".." must be changed (ie the directory gets a new 950 * parent) then the source directory must not be in the 951 * directory hierarchy above the target, as this would 952 * orphan everything below the source directory. Also 953 * the user must have write permission in the source so 954 * as to be able to change "..". We must repeat the call 955 * to namei, as the parent directory is unlocked by the 956 * call to doscheckpath(). 957 */ 958 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, p); 959 VOP_UNLOCK(fvp, 0); 960 if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster) 961 newparent = 1; 962 vrele(fdvp); 963 if (doingdirectory && newparent) { 964 if (error) /* write access check above */ 965 goto bad; 966 if (xp != NULL) 967 vput(tvp); 968 /* 969 * doscheckpath() vput()'s dp, 970 * so we have to do a relookup afterwards 971 */ 972 if ((error = doscheckpath(ip, dp)) != 0) 973 goto out; 974 if ((tcnp->cn_flags & SAVESTART) == 0) 975 panic("msdosfs_rename: lost to startdir"); 976 if ((error = relookup(tdvp, &tvp, tcnp)) != 0) 977 goto out; 978 dp = VTODE(tdvp); 979 xp = tvp ? VTODE(tvp) : NULL; 980 } 981 982 if (xp != NULL) { 983 /* 984 * Target must be empty if a directory and have no links 985 * to it. Also, ensure source and target are compatible 986 * (both directories, or both not directories). 987 */ 988 if (xp->de_Attributes & ATTR_DIRECTORY) { 989 if (!dosdirempty(xp)) { 990 error = ENOTEMPTY; 991 goto bad; 992 } 993 if (!doingdirectory) { 994 error = ENOTDIR; 995 goto bad; 996 } 997 } else if (doingdirectory) { 998 error = EISDIR; 999 goto bad; 1000 } 1001 if ((error = removede(dp, xp)) != 0) 1002 goto bad; 1003 VN_KNOTE(tdvp, NOTE_WRITE); 1004 VN_KNOTE(tvp, NOTE_DELETE); 1005 cache_purge(tvp); 1006 vput(tvp); 1007 xp = NULL; 1008 } 1009 1010 /* 1011 * Convert the filename in tcnp into a dos filename. We copy this 1012 * into the denode and directory entry for the destination 1013 * file/directory. 1014 */ 1015 if ((error = uniqdosname(VTODE(tdvp), tcnp, toname)) != 0) 1016 goto abortit; 1017 1018 /* 1019 * Since from wasn't locked at various places above, 1020 * have to do a relookup here. 1021 */ 1022 fcnp->cn_flags &= ~MODMASK; 1023 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 1024 if ((fcnp->cn_flags & SAVESTART) == 0) 1025 panic("msdosfs_rename: lost from startdir"); 1026 if (!newparent) 1027 VOP_UNLOCK(tdvp, 0); 1028 (void) relookup(fdvp, &fvp, fcnp); 1029 if (fvp == NULL) { 1030 /* 1031 * From name has disappeared. 1032 */ 1033 if (doingdirectory) 1034 panic("rename: lost dir entry"); 1035 vrele(ap->a_fvp); 1036 if (newparent) 1037 VOP_UNLOCK(tdvp, 0); 1038 vrele(tdvp); 1039 return 0; 1040 } 1041 fdvp_dorele = 1; 1042 xp = VTODE(fvp); 1043 zp = VTODE(fdvp); 1044 from_diroffset = zp->de_fndoffset; 1045 1046 /* 1047 * Ensure that the directory entry still exists and has not 1048 * changed till now. If the source is a file the entry may 1049 * have been unlinked or renamed. In either case there is 1050 * no further work to be done. If the source is a directory 1051 * then it cannot have been rmdir'ed or renamed; this is 1052 * prohibited by the DE_RENAME flag. 1053 */ 1054 if (xp != ip) { 1055 if (doingdirectory) 1056 panic("rename: lost dir entry"); 1057 vrele(ap->a_fvp); 1058 VOP_UNLOCK(fvp, 0); 1059 if (newparent) 1060 VOP_UNLOCK(fdvp, 0); 1061 xp = NULL; 1062 } else { 1063 vrele(fvp); 1064 xp = NULL; 1065 1066 /* 1067 * First write a new entry in the destination 1068 * directory and mark the entry in the source directory 1069 * as deleted. Then move the denode to the correct hash 1070 * chain for its new location in the filesystem. And, if 1071 * we moved a directory, then update its .. entry to point 1072 * to the new parent directory. 1073 */ 1074 memcpy(oldname, ip->de_Name, 11); 1075 memcpy(ip->de_Name, toname, 11); /* update denode */ 1076 dp->de_fndoffset = to_diroffset; 1077 dp->de_fndcnt = to_count; 1078 error = createde(ip, dp, (struct denode **)0, tcnp); 1079 if (error) { 1080 memcpy(ip->de_Name, oldname, 11); 1081 if (newparent) 1082 VOP_UNLOCK(fdvp, 0); 1083 VOP_UNLOCK(fvp, 0); 1084 goto bad; 1085 } 1086 ip->de_refcnt++; 1087 zp->de_fndoffset = from_diroffset; 1088 if ((error = removede(zp, ip)) != 0) { 1089 /* XXX should really panic here, fs is corrupt */ 1090 if (newparent) 1091 VOP_UNLOCK(fdvp, 0); 1092 VOP_UNLOCK(fvp, 0); 1093 goto bad; 1094 } 1095 cache_purge(fvp); 1096 if (!doingdirectory) { 1097 error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0, 1098 &ip->de_dirclust, 0); 1099 if (error) { 1100 /* XXX should really panic here, fs is corrupt */ 1101 if (newparent) 1102 VOP_UNLOCK(fdvp, 0); 1103 VOP_UNLOCK(fvp, 0); 1104 goto bad; 1105 } 1106 ip->de_diroffset = to_diroffset; 1107 if (ip->de_dirclust != MSDOSFSROOT) 1108 ip->de_diroffset &= pmp->pm_crbomask; 1109 } 1110 reinsert(ip); 1111 if (newparent) 1112 VOP_UNLOCK(fdvp, 0); 1113 } 1114 1115 /* 1116 * If we moved a directory to a new parent directory, then we must 1117 * fixup the ".." entry in the moved directory. 1118 */ 1119 if (doingdirectory && newparent) { 1120 cn = ip->de_StartCluster; 1121 if (cn == MSDOSFSROOT) { 1122 /* this should never happen */ 1123 panic("msdosfs_rename: updating .. in root directory?"); 1124 } else 1125 bn = cntobn(pmp, cn); 1126 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, 1127 NOCRED, &bp); 1128 if (error) { 1129 /* XXX should really panic here, fs is corrupt */ 1130 brelse(bp); 1131 VOP_UNLOCK(fvp, 0); 1132 goto bad; 1133 } 1134 dotdotp = (struct direntry *)bp->b_data + 1; 1135 putushort(dotdotp->deStartCluster, dp->de_StartCluster); 1136 if (FAT32(pmp)) { 1137 putushort(dotdotp->deHighClust, 1138 dp->de_StartCluster >> 16); 1139 } 1140 if ((error = bwrite(bp)) != 0) { 1141 /* XXX should really panic here, fs is corrupt */ 1142 VOP_UNLOCK(fvp, 0); 1143 goto bad; 1144 } 1145 } 1146 1147 VN_KNOTE(fvp, NOTE_RENAME); 1148 VOP_UNLOCK(fvp, 0); 1149 bad: 1150 if (xp) 1151 vput(tvp); 1152 vput(tdvp); 1153 out: 1154 ip->de_flag &= ~DE_RENAME; 1155 if (fdvp_dorele) 1156 vrele(fdvp); 1157 vrele(fvp); 1158 return (error); 1159 1160 } 1161 1162 static const struct { 1163 struct direntry dot; 1164 struct direntry dotdot; 1165 } dosdirtemplate = { 1166 { ". ", " ", /* the . entry */ 1167 ATTR_DIRECTORY, /* file attribute */ 1168 0, /* reserved */ 1169 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1170 { 0, 0 }, /* access date */ 1171 { 0, 0 }, /* high bits of start cluster */ 1172 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1173 { 0, 0 }, /* startcluster */ 1174 { 0, 0, 0, 0 } /* filesize */ 1175 }, 1176 { ".. ", " ", /* the .. entry */ 1177 ATTR_DIRECTORY, /* file attribute */ 1178 0, /* reserved */ 1179 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1180 { 0, 0 }, /* access date */ 1181 { 0, 0 }, /* high bits of start cluster */ 1182 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1183 { 0, 0 }, /* startcluster */ 1184 { 0, 0, 0, 0 } /* filesize */ 1185 } 1186 }; 1187 1188 int 1189 msdosfs_mkdir(v) 1190 void *v; 1191 { 1192 struct vop_mkdir_args /* { 1193 struct vnode *a_dvp; 1194 struvt vnode **a_vpp; 1195 struvt componentname *a_cnp; 1196 struct vattr *a_vap; 1197 } */ *ap = v; 1198 struct componentname *cnp = ap->a_cnp; 1199 struct denode ndirent; 1200 struct denode *dep; 1201 struct denode *pdep = VTODE(ap->a_dvp); 1202 int error; 1203 int bn; 1204 u_long newcluster, pcl; 1205 struct direntry *denp; 1206 struct msdosfsmount *pmp = pdep->de_pmp; 1207 struct buf *bp; 1208 struct timespec ts; 1209 int async = pdep->de_pmp->pm_mountp->mnt_flag & MNT_ASYNC; 1210 1211 /* 1212 * If this is the root directory and there is no space left we 1213 * can't do anything. This is because the root directory can not 1214 * change size. 1215 */ 1216 if (pdep->de_StartCluster == MSDOSFSROOT 1217 && pdep->de_fndoffset >= pdep->de_FileSize) { 1218 error = ENOSPC; 1219 goto bad2; 1220 } 1221 1222 /* 1223 * Allocate a cluster to hold the about to be created directory. 1224 */ 1225 error = clusteralloc(pmp, 0, 1, &newcluster, NULL); 1226 if (error) 1227 goto bad2; 1228 1229 memset(&ndirent, 0, sizeof(ndirent)); 1230 ndirent.de_pmp = pmp; 1231 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 1232 TIMEVAL_TO_TIMESPEC(&time, &ts); 1233 DETIMES(&ndirent, &ts, &ts, &ts); 1234 1235 /* 1236 * Now fill the cluster with the "." and ".." entries. And write 1237 * the cluster to disk. This way it is there for the parent 1238 * directory to be pointing at if there were a crash. 1239 */ 1240 bn = cntobn(pmp, newcluster); 1241 /* always succeeds */ 1242 bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0); 1243 memset(bp->b_data, 0, pmp->pm_bpcluster); 1244 memcpy(bp->b_data, &dosdirtemplate, sizeof dosdirtemplate); 1245 denp = (struct direntry *)bp->b_data; 1246 putushort(denp[0].deStartCluster, newcluster); 1247 putushort(denp[0].deCDate, ndirent.de_CDate); 1248 putushort(denp[0].deCTime, ndirent.de_CTime); 1249 denp[0].deCHundredth = ndirent.de_CHun; 1250 putushort(denp[0].deADate, ndirent.de_ADate); 1251 putushort(denp[0].deMDate, ndirent.de_MDate); 1252 putushort(denp[0].deMTime, ndirent.de_MTime); 1253 pcl = pdep->de_StartCluster; 1254 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1255 pcl = 0; 1256 putushort(denp[1].deStartCluster, pcl); 1257 putushort(denp[1].deCDate, ndirent.de_CDate); 1258 putushort(denp[1].deCTime, ndirent.de_CTime); 1259 denp[1].deCHundredth = ndirent.de_CHun; 1260 putushort(denp[1].deADate, ndirent.de_ADate); 1261 putushort(denp[1].deMDate, ndirent.de_MDate); 1262 putushort(denp[1].deMTime, ndirent.de_MTime); 1263 if (FAT32(pmp)) { 1264 putushort(denp[0].deHighClust, newcluster >> 16); 1265 putushort(denp[1].deHighClust, pdep->de_StartCluster >> 16); 1266 } 1267 1268 if (async) 1269 bdwrite(bp); 1270 else if ((error = bwrite(bp)) != 0) 1271 goto bad; 1272 1273 /* 1274 * Now build up a directory entry pointing to the newly allocated 1275 * cluster. This will be written to an empty slot in the parent 1276 * directory. 1277 */ 1278 #ifdef DIAGNOSTIC 1279 if ((cnp->cn_flags & HASBUF) == 0) 1280 panic("msdosfs_mkdir: no name"); 1281 #endif 1282 if ((error = uniqdosname(pdep, cnp, ndirent.de_Name)) != 0) 1283 goto bad; 1284 1285 ndirent.de_Attributes = ATTR_DIRECTORY; 1286 ndirent.de_StartCluster = newcluster; 1287 ndirent.de_FileSize = 0; 1288 ndirent.de_dev = pdep->de_dev; 1289 ndirent.de_devvp = pdep->de_devvp; 1290 if ((error = createde(&ndirent, pdep, &dep, cnp)) != 0) 1291 goto bad; 1292 if ((cnp->cn_flags & SAVESTART) == 0) 1293 PNBUF_PUT(cnp->cn_pnbuf); 1294 VN_KNOTE(ap->a_dvp, NOTE_WRITE | NOTE_LINK); 1295 vput(ap->a_dvp); 1296 *ap->a_vpp = DETOV(dep); 1297 return (0); 1298 1299 bad: 1300 clusterfree(pmp, newcluster, NULL); 1301 bad2: 1302 PNBUF_PUT(cnp->cn_pnbuf); 1303 vput(ap->a_dvp); 1304 return (error); 1305 } 1306 1307 int 1308 msdosfs_rmdir(v) 1309 void *v; 1310 { 1311 struct vop_rmdir_args /* { 1312 struct vnode *a_dvp; 1313 struct vnode *a_vp; 1314 struct componentname *a_cnp; 1315 } */ *ap = v; 1316 struct vnode *vp = ap->a_vp; 1317 struct vnode *dvp = ap->a_dvp; 1318 struct componentname *cnp = ap->a_cnp; 1319 struct denode *ip, *dp; 1320 int error; 1321 1322 ip = VTODE(vp); 1323 dp = VTODE(dvp); 1324 /* 1325 * No rmdir "." please. 1326 */ 1327 if (dp == ip) { 1328 vrele(dvp); 1329 vput(vp); 1330 return (EINVAL); 1331 } 1332 /* 1333 * Verify the directory is empty (and valid). 1334 * (Rmdir ".." won't be valid since 1335 * ".." will contain a reference to 1336 * the current directory and thus be 1337 * non-empty.) 1338 */ 1339 error = 0; 1340 if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) { 1341 error = ENOTEMPTY; 1342 goto out; 1343 } 1344 /* 1345 * Delete the entry from the directory. For dos filesystems this 1346 * gets rid of the directory entry on disk, the in memory copy 1347 * still exists but the de_refcnt is <= 0. This prevents it from 1348 * being found by deget(). When the vput() on dep is done we give 1349 * up access and eventually msdosfs_reclaim() will be called which 1350 * will remove it from the denode cache. 1351 */ 1352 if ((error = removede(dp, ip)) != 0) 1353 goto out; 1354 /* 1355 * This is where we decrement the link count in the parent 1356 * directory. Since dos filesystems don't do this we just purge 1357 * the name cache and let go of the parent directory denode. 1358 */ 1359 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 1360 cache_purge(dvp); 1361 vput(dvp); 1362 dvp = NULL; 1363 /* 1364 * Truncate the directory that is being deleted. 1365 */ 1366 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred, cnp->cn_proc); 1367 cache_purge(vp); 1368 out: 1369 VN_KNOTE(vp, NOTE_DELETE); 1370 if (dvp) 1371 vput(dvp); 1372 vput(vp); 1373 return (error); 1374 } 1375 1376 /* 1377 * DOS filesystems don't know what symlinks are. 1378 */ 1379 int 1380 msdosfs_symlink(v) 1381 void *v; 1382 { 1383 struct vop_symlink_args /* { 1384 struct vnode *a_dvp; 1385 struct vnode **a_vpp; 1386 struct componentname *a_cnp; 1387 struct vattr *a_vap; 1388 char *a_target; 1389 } */ *ap = v; 1390 1391 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 1392 vput(ap->a_dvp); 1393 return (EOPNOTSUPP); 1394 } 1395 1396 int 1397 msdosfs_readdir(v) 1398 void *v; 1399 { 1400 struct vop_readdir_args /* { 1401 struct vnode *a_vp; 1402 struct uio *a_uio; 1403 struct ucred *a_cred; 1404 int *a_eofflag; 1405 off_t **a_cookies; 1406 int *a_ncookies; 1407 } */ *ap = v; 1408 int error = 0; 1409 int diff; 1410 long n; 1411 int blsize; 1412 long on; 1413 long lost; 1414 long count; 1415 u_long cn; 1416 u_long fileno; 1417 u_long dirsperblk; 1418 long bias = 0; 1419 daddr_t bn, lbn; 1420 struct buf *bp; 1421 struct denode *dep = VTODE(ap->a_vp); 1422 struct msdosfsmount *pmp = dep->de_pmp; 1423 struct direntry *dentp; 1424 struct dirent dirbuf; 1425 struct uio *uio = ap->a_uio; 1426 off_t *cookies = NULL; 1427 int ncookies = 0, nc = 0; 1428 off_t offset, uio_off; 1429 int chksum = -1; 1430 1431 #ifdef MSDOSFS_DEBUG 1432 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n", 1433 ap->a_vp, uio, ap->a_cred, ap->a_eofflag); 1434 #endif 1435 1436 /* 1437 * msdosfs_readdir() won't operate properly on regular files since 1438 * it does i/o only with the filesystem vnode, and hence can 1439 * retrieve the wrong block from the buffer cache for a plain file. 1440 * So, fail attempts to readdir() on a plain file. 1441 */ 1442 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) 1443 return (ENOTDIR); 1444 1445 /* 1446 * To be safe, initialize dirbuf 1447 */ 1448 memset(dirbuf.d_name, 0, sizeof(dirbuf.d_name)); 1449 1450 /* 1451 * If the user buffer is smaller than the size of one dos directory 1452 * entry or the file offset is not a multiple of the size of a 1453 * directory entry, then we fail the read. 1454 */ 1455 count = uio->uio_resid & ~(sizeof(struct direntry) - 1); 1456 offset = uio->uio_offset; 1457 if (count < sizeof(struct direntry) || 1458 (offset & (sizeof(struct direntry) - 1))) 1459 return (EINVAL); 1460 lost = uio->uio_resid - count; 1461 uio->uio_resid = count; 1462 uio_off = uio->uio_offset; 1463 1464 if (ap->a_ncookies) { 1465 nc = uio->uio_resid / 16; 1466 cookies = malloc(nc * sizeof (off_t), M_TEMP, M_WAITOK); 1467 *ap->a_cookies = cookies; 1468 } 1469 1470 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 1471 1472 /* 1473 * If they are reading from the root directory then, we simulate 1474 * the . and .. entries since these don't exist in the root 1475 * directory. We also set the offset bias to make up for having to 1476 * simulate these entries. By this I mean that at file offset 64 we 1477 * read the first entry in the root directory that lives on disk. 1478 */ 1479 if (dep->de_StartCluster == MSDOSFSROOT 1480 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) { 1481 #if 0 1482 printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n", 1483 offset); 1484 #endif 1485 bias = 2 * sizeof(struct direntry); 1486 if (offset < bias) { 1487 for (n = (int)offset / sizeof(struct direntry); 1488 n < 2; n++) { 1489 if (FAT32(pmp)) 1490 dirbuf.d_fileno = cntobn(pmp, 1491 pmp->pm_rootdirblk) 1492 * dirsperblk; 1493 else 1494 dirbuf.d_fileno = 1; 1495 dirbuf.d_type = DT_DIR; 1496 switch (n) { 1497 case 0: 1498 dirbuf.d_namlen = 1; 1499 strcpy(dirbuf.d_name, "."); 1500 break; 1501 case 1: 1502 dirbuf.d_namlen = 2; 1503 strcpy(dirbuf.d_name, ".."); 1504 break; 1505 } 1506 dirbuf.d_reclen = DIRENT_SIZE(&dirbuf); 1507 if (uio->uio_resid < dirbuf.d_reclen) 1508 goto out; 1509 error = uiomove((caddr_t) &dirbuf, 1510 dirbuf.d_reclen, uio); 1511 if (error) 1512 goto out; 1513 offset += sizeof(struct direntry); 1514 uio_off = offset; 1515 if (cookies) { 1516 *cookies++ = offset; 1517 ncookies++; 1518 if (ncookies >= nc) 1519 goto out; 1520 } 1521 } 1522 } 1523 } 1524 1525 while (uio->uio_resid > 0) { 1526 lbn = de_cluster(pmp, offset - bias); 1527 on = (offset - bias) & pmp->pm_crbomask; 1528 n = MIN(pmp->pm_bpcluster - on, uio->uio_resid); 1529 diff = dep->de_FileSize - (offset - bias); 1530 if (diff <= 0) 1531 break; 1532 n = MIN(n, diff); 1533 if ((error = pcbmap(dep, lbn, &bn, &cn, &blsize)) != 0) 1534 break; 1535 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp); 1536 if (error) { 1537 brelse(bp); 1538 return (error); 1539 } 1540 n = MIN(n, blsize - bp->b_resid); 1541 1542 /* 1543 * Convert from dos directory entries to fs-independent 1544 * directory entries. 1545 */ 1546 for (dentp = (struct direntry *)(bp->b_data + on); 1547 (char *)dentp < bp->b_data + on + n; 1548 dentp++, offset += sizeof(struct direntry)) { 1549 #if 0 1550 1551 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n", 1552 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes); 1553 #endif 1554 /* 1555 * If this is an unused entry, we can stop. 1556 */ 1557 if (dentp->deName[0] == SLOT_EMPTY) { 1558 brelse(bp); 1559 goto out; 1560 } 1561 /* 1562 * Skip deleted entries. 1563 */ 1564 if (dentp->deName[0] == SLOT_DELETED) { 1565 chksum = -1; 1566 continue; 1567 } 1568 1569 /* 1570 * Handle Win95 long directory entries 1571 */ 1572 if (dentp->deAttributes == ATTR_WIN95) { 1573 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) 1574 continue; 1575 chksum = win2unixfn((struct winentry *)dentp, &dirbuf, chksum); 1576 continue; 1577 } 1578 1579 /* 1580 * Skip volume labels 1581 */ 1582 if (dentp->deAttributes & ATTR_VOLUME) { 1583 chksum = -1; 1584 continue; 1585 } 1586 /* 1587 * This computation of d_fileno must match 1588 * the computation of va_fileid in 1589 * msdosfs_getattr. 1590 */ 1591 if (dentp->deAttributes & ATTR_DIRECTORY) { 1592 fileno = getushort(dentp->deStartCluster); 1593 if (FAT32(pmp)) 1594 fileno |= getushort(dentp->deHighClust) << 16; 1595 /* if this is the root directory */ 1596 if (fileno == MSDOSFSROOT) 1597 if (FAT32(pmp)) 1598 fileno = cntobn(pmp, 1599 pmp->pm_rootdirblk) 1600 * dirsperblk; 1601 else 1602 fileno = 1; 1603 else 1604 fileno = cntobn(pmp, fileno) * dirsperblk; 1605 dirbuf.d_fileno = fileno; 1606 dirbuf.d_type = DT_DIR; 1607 } else { 1608 dirbuf.d_fileno = offset / sizeof(struct direntry); 1609 dirbuf.d_type = DT_REG; 1610 } 1611 if (chksum != winChksum(dentp->deName)) 1612 dirbuf.d_namlen = dos2unixfn(dentp->deName, 1613 (u_char *)dirbuf.d_name, 1614 pmp->pm_flags & MSDOSFSMNT_SHORTNAME); 1615 else 1616 dirbuf.d_name[dirbuf.d_namlen] = 0; 1617 chksum = -1; 1618 dirbuf.d_reclen = DIRENT_SIZE(&dirbuf); 1619 if (uio->uio_resid < dirbuf.d_reclen) { 1620 brelse(bp); 1621 goto out; 1622 } 1623 error = uiomove((caddr_t) &dirbuf, 1624 dirbuf.d_reclen, uio); 1625 if (error) { 1626 brelse(bp); 1627 goto out; 1628 } 1629 uio_off = offset + sizeof(struct direntry); 1630 if (cookies) { 1631 *cookies++ = offset + sizeof(struct direntry); 1632 ncookies++; 1633 if (ncookies >= nc) { 1634 brelse(bp); 1635 goto out; 1636 } 1637 } 1638 } 1639 brelse(bp); 1640 } 1641 1642 out: 1643 uio->uio_offset = uio_off; 1644 uio->uio_resid += lost; 1645 if (dep->de_FileSize - (offset - bias) <= 0) 1646 *ap->a_eofflag = 1; 1647 else 1648 *ap->a_eofflag = 0; 1649 1650 if (ap->a_ncookies) { 1651 if (error) { 1652 free(*ap->a_cookies, M_TEMP); 1653 *ap->a_ncookies = 0; 1654 *ap->a_cookies = NULL; 1655 } else 1656 *ap->a_ncookies = ncookies; 1657 } 1658 return (error); 1659 } 1660 1661 /* 1662 * DOS filesystems don't know what symlinks are. 1663 */ 1664 int 1665 msdosfs_readlink(v) 1666 void *v; 1667 { 1668 #if 0 1669 struct vop_readlink_args /* { 1670 struct vnode *a_vp; 1671 struct uio *a_uio; 1672 struct ucred *a_cred; 1673 } */ *ap; 1674 #endif 1675 1676 return (EINVAL); 1677 } 1678 1679 /* 1680 * vp - address of vnode file the file 1681 * bn - which cluster we are interested in mapping to a filesystem block number. 1682 * vpp - returns the vnode for the block special file holding the filesystem 1683 * containing the file of interest 1684 * bnp - address of where to return the filesystem relative block number 1685 */ 1686 int 1687 msdosfs_bmap(v) 1688 void *v; 1689 { 1690 struct vop_bmap_args /* { 1691 struct vnode *a_vp; 1692 daddr_t a_bn; 1693 struct vnode **a_vpp; 1694 daddr_t *a_bnp; 1695 int *a_runp; 1696 } */ *ap = v; 1697 struct denode *dep = VTODE(ap->a_vp); 1698 1699 if (ap->a_vpp != NULL) 1700 *ap->a_vpp = dep->de_devvp; 1701 if (ap->a_bnp == NULL) 1702 return (0); 1703 if (ap->a_runp) { 1704 /* 1705 * Sequential clusters should be counted here. 1706 */ 1707 *ap->a_runp = 0; 1708 } 1709 return (pcbmap(dep, ap->a_bn, ap->a_bnp, 0, 0)); 1710 } 1711 1712 int 1713 msdosfs_reallocblks(v) 1714 void *v; 1715 { 1716 #if 0 1717 struct vop_reallocblks_args /* { 1718 struct vnode *a_vp; 1719 struct cluster_save *a_buflist; 1720 } */ *ap = v; 1721 #endif 1722 1723 /* Currently no support for clustering */ /* XXX */ 1724 return (ENOSPC); 1725 } 1726 1727 int 1728 msdosfs_strategy(v) 1729 void *v; 1730 { 1731 struct vop_strategy_args /* { 1732 struct buf *a_bp; 1733 } */ *ap = v; 1734 struct buf *bp = ap->a_bp; 1735 struct denode *dep = VTODE(bp->b_vp); 1736 struct vnode *vp; 1737 int error = 0; 1738 1739 if (bp->b_vp->v_type == VBLK || bp->b_vp->v_type == VCHR) 1740 panic("msdosfs_strategy: spec"); 1741 /* 1742 * If we don't already know the filesystem relative block number 1743 * then get it using pcbmap(). If pcbmap() returns the block 1744 * number as -1 then we've got a hole in the file. DOS filesystems 1745 * don't allow files with holes, so we shouldn't ever see this. 1746 */ 1747 if (bp->b_blkno == bp->b_lblkno) { 1748 error = pcbmap(dep, de_bn2cn(dep->de_pmp, bp->b_lblkno), 1749 &bp->b_blkno, 0, 0); 1750 if (error) 1751 bp->b_blkno = -1; 1752 if (bp->b_blkno == -1) 1753 clrbuf(bp); 1754 } 1755 if (bp->b_blkno == -1) { 1756 biodone(bp); 1757 return (error); 1758 } 1759 1760 /* 1761 * Read/write the block from/to the disk that contains the desired 1762 * file block. 1763 */ 1764 1765 vp = dep->de_devvp; 1766 bp->b_dev = vp->v_rdev; 1767 VOCALL(vp->v_op, VOFFSET(vop_strategy), ap); 1768 return (0); 1769 } 1770 1771 int 1772 msdosfs_print(v) 1773 void *v; 1774 { 1775 struct vop_print_args /* { 1776 struct vnode *vp; 1777 } */ *ap = v; 1778 struct denode *dep = VTODE(ap->a_vp); 1779 1780 printf( 1781 "tag VT_MSDOSFS, startcluster %ld, dircluster %ld, diroffset %ld ", 1782 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset); 1783 printf(" dev %d, %d ", major(dep->de_dev), minor(dep->de_dev)); 1784 lockmgr_printinfo(&ap->a_vp->v_lock); 1785 printf("\n"); 1786 return (0); 1787 } 1788 1789 int 1790 msdosfs_advlock(v) 1791 void *v; 1792 { 1793 struct vop_advlock_args /* { 1794 struct vnode *a_vp; 1795 caddr_t a_id; 1796 int a_op; 1797 struct flock *a_fl; 1798 int a_flags; 1799 } */ *ap = v; 1800 struct denode *dep = VTODE(ap->a_vp); 1801 1802 return lf_advlock(ap, &dep->de_lockf, dep->de_FileSize); 1803 } 1804 1805 int 1806 msdosfs_pathconf(v) 1807 void *v; 1808 { 1809 struct vop_pathconf_args /* { 1810 struct vnode *a_vp; 1811 int a_name; 1812 register_t *a_retval; 1813 } */ *ap = v; 1814 struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp; 1815 1816 switch (ap->a_name) { 1817 case _PC_LINK_MAX: 1818 *ap->a_retval = 1; 1819 return (0); 1820 case _PC_NAME_MAX: 1821 *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12; 1822 return (0); 1823 case _PC_PATH_MAX: 1824 *ap->a_retval = PATH_MAX; 1825 return (0); 1826 case _PC_CHOWN_RESTRICTED: 1827 *ap->a_retval = 1; 1828 return (0); 1829 case _PC_NO_TRUNC: 1830 *ap->a_retval = 0; 1831 return (0); 1832 case _PC_SYNC_IO: 1833 *ap->a_retval = 1; 1834 return (0); 1835 case _PC_FILESIZEBITS: 1836 *ap->a_retval = 32; 1837 return (0); 1838 default: 1839 return (EINVAL); 1840 } 1841 /* NOTREACHED */ 1842 } 1843 1844 /* Global vfs data structures for msdosfs */ 1845 int (**msdosfs_vnodeop_p) __P((void *)); 1846 const struct vnodeopv_entry_desc msdosfs_vnodeop_entries[] = { 1847 { &vop_default_desc, vn_default_error }, 1848 { &vop_lookup_desc, msdosfs_lookup }, /* lookup */ 1849 { &vop_create_desc, msdosfs_create }, /* create */ 1850 { &vop_mknod_desc, msdosfs_mknod }, /* mknod */ 1851 { &vop_open_desc, msdosfs_open }, /* open */ 1852 { &vop_close_desc, msdosfs_close }, /* close */ 1853 { &vop_access_desc, msdosfs_access }, /* access */ 1854 { &vop_getattr_desc, msdosfs_getattr }, /* getattr */ 1855 { &vop_setattr_desc, msdosfs_setattr }, /* setattr */ 1856 { &vop_read_desc, msdosfs_read }, /* read */ 1857 { &vop_write_desc, msdosfs_write }, /* write */ 1858 { &vop_lease_desc, msdosfs_lease_check }, /* lease */ 1859 { &vop_fcntl_desc, genfs_fcntl }, /* fcntl */ 1860 { &vop_ioctl_desc, msdosfs_ioctl }, /* ioctl */ 1861 { &vop_poll_desc, msdosfs_poll }, /* poll */ 1862 { &vop_kqfilter_desc, genfs_kqfilter }, /* kqfilter */ 1863 { &vop_revoke_desc, msdosfs_revoke }, /* revoke */ 1864 { &vop_mmap_desc, msdosfs_mmap }, /* mmap */ 1865 { &vop_fsync_desc, msdosfs_fsync }, /* fsync */ 1866 { &vop_seek_desc, msdosfs_seek }, /* seek */ 1867 { &vop_remove_desc, msdosfs_remove }, /* remove */ 1868 { &vop_link_desc, msdosfs_link }, /* link */ 1869 { &vop_rename_desc, msdosfs_rename }, /* rename */ 1870 { &vop_mkdir_desc, msdosfs_mkdir }, /* mkdir */ 1871 { &vop_rmdir_desc, msdosfs_rmdir }, /* rmdir */ 1872 { &vop_symlink_desc, msdosfs_symlink }, /* symlink */ 1873 { &vop_readdir_desc, msdosfs_readdir }, /* readdir */ 1874 { &vop_readlink_desc, msdosfs_readlink }, /* readlink */ 1875 { &vop_abortop_desc, msdosfs_abortop }, /* abortop */ 1876 { &vop_inactive_desc, msdosfs_inactive }, /* inactive */ 1877 { &vop_reclaim_desc, msdosfs_reclaim }, /* reclaim */ 1878 { &vop_lock_desc, genfs_lock }, /* lock */ 1879 { &vop_unlock_desc, genfs_unlock }, /* unlock */ 1880 { &vop_bmap_desc, msdosfs_bmap }, /* bmap */ 1881 { &vop_strategy_desc, msdosfs_strategy }, /* strategy */ 1882 { &vop_print_desc, msdosfs_print }, /* print */ 1883 { &vop_islocked_desc, genfs_islocked }, /* islocked */ 1884 { &vop_pathconf_desc, msdosfs_pathconf }, /* pathconf */ 1885 { &vop_advlock_desc, msdosfs_advlock }, /* advlock */ 1886 { &vop_reallocblks_desc, msdosfs_reallocblks }, /* reallocblks */ 1887 { &vop_update_desc, msdosfs_update }, /* update */ 1888 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 1889 { &vop_getpages_desc, genfs_getpages }, /* getpages */ 1890 { &vop_putpages_desc, genfs_putpages }, /* putpages */ 1891 { NULL, NULL } 1892 }; 1893 const struct vnodeopv_desc msdosfs_vnodeop_opv_desc = 1894 { &msdosfs_vnodeop_p, msdosfs_vnodeop_entries }; 1895