1 /* $NetBSD: msdosfs_vnops.c,v 1.12 2004/09/13 19:25:48 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 1.12 2004/09/13 19:25:48 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, pdep->de_pmp->pm_gmtoff); 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, dep->de_pmp->pm_gmtoff); 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, 267 mode & (vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask), 268 pmp->pm_uid, pmp->pm_gid, ap->a_mode, ap->a_cred)); 269 } 270 271 int 272 msdosfs_getattr(v) 273 void *v; 274 { 275 struct vop_getattr_args /* { 276 struct vnode *a_vp; 277 struct vattr *a_vap; 278 struct ucred *a_cred; 279 struct proc *a_p; 280 } */ *ap = v; 281 struct denode *dep = VTODE(ap->a_vp); 282 struct msdosfsmount *pmp = dep->de_pmp; 283 struct vattr *vap = ap->a_vap; 284 mode_t mode; 285 struct timespec ts; 286 u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 287 u_long fileid; 288 289 TIMEVAL_TO_TIMESPEC(&time, &ts); 290 DETIMES(dep, &ts, &ts, &ts, pmp->pm_gmtoff); 291 vap->va_fsid = dep->de_dev; 292 /* 293 * The following computation of the fileid must be the same as that 294 * used in msdosfs_readdir() to compute d_fileno. If not, pwd 295 * doesn't work. 296 */ 297 if (dep->de_Attributes & ATTR_DIRECTORY) { 298 fileid = cntobn(pmp, dep->de_StartCluster) * dirsperblk; 299 if (dep->de_StartCluster == MSDOSFSROOT) 300 fileid = 1; 301 } else { 302 fileid = cntobn(pmp, dep->de_dirclust) * dirsperblk; 303 if (dep->de_dirclust == MSDOSFSROOT) 304 fileid = roottobn(pmp, 0) * dirsperblk; 305 fileid += dep->de_diroffset / sizeof(struct direntry); 306 } 307 vap->va_fileid = fileid; 308 if ((dep->de_Attributes & ATTR_READONLY) == 0) 309 mode = S_IRWXU|S_IRWXG|S_IRWXO; 310 else 311 mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 312 vap->va_mode = 313 mode & (ap->a_vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); 314 vap->va_uid = pmp->pm_uid; 315 vap->va_gid = pmp->pm_gid; 316 vap->va_nlink = 1; 317 vap->va_rdev = 0; 318 vap->va_size = ap->a_vp->v_size; 319 dos2unixtime(dep->de_MDate, dep->de_MTime, 0, pmp->pm_gmtoff, 320 &vap->va_mtime); 321 if (dep->de_pmp->pm_flags & MSDOSFSMNT_LONGNAME) { 322 dos2unixtime(dep->de_ADate, 0, 0, pmp->pm_gmtoff, 323 &vap->va_atime); 324 dos2unixtime(dep->de_CDate, dep->de_CTime, dep->de_CHun, 325 pmp->pm_gmtoff, &vap->va_ctime); 326 } else { 327 vap->va_atime = vap->va_mtime; 328 vap->va_ctime = vap->va_mtime; 329 } 330 vap->va_flags = 0; 331 if ((dep->de_Attributes & ATTR_ARCHIVE) == 0) 332 vap->va_mode |= S_ARCH1; 333 vap->va_gen = 0; 334 vap->va_blocksize = pmp->pm_bpcluster; 335 vap->va_bytes = 336 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask; 337 vap->va_type = ap->a_vp->v_type; 338 return (0); 339 } 340 341 int 342 msdosfs_setattr(v) 343 void *v; 344 { 345 struct vop_setattr_args /* { 346 struct vnode *a_vp; 347 struct vattr *a_vap; 348 struct ucred *a_cred; 349 struct proc *a_p; 350 } */ *ap = v; 351 int error = 0, de_changed = 0; 352 struct denode *dep = VTODE(ap->a_vp); 353 struct msdosfsmount *pmp = dep->de_pmp; 354 struct vnode *vp = ap->a_vp; 355 struct vattr *vap = ap->a_vap; 356 struct ucred *cred = ap->a_cred; 357 358 #ifdef MSDOSFS_DEBUG 359 printf("msdosfs_setattr(): vp %p, vap %p, cred %p, p %p\n", 360 ap->a_vp, vap, cred, ap->a_p); 361 #endif 362 /* 363 * Note we silently ignore uid or gid changes. 364 */ 365 if ((vap->va_type != VNON) || (vap->va_nlink != (nlink_t)VNOVAL) || 366 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 367 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 368 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL) || 369 (vap->va_uid != VNOVAL && vap->va_uid != pmp->pm_uid) || 370 (vap->va_gid != VNOVAL && vap->va_gid != pmp->pm_gid)) { 371 #ifdef MSDOSFS_DEBUG 372 printf("msdosfs_setattr(): returning EINVAL\n"); 373 printf(" va_type %d, va_nlink %x, va_fsid %lx, va_fileid %lx\n", 374 vap->va_type, vap->va_nlink, vap->va_fsid, vap->va_fileid); 375 printf(" va_blocksize %lx, va_rdev %x, va_bytes %qx, va_gen %lx\n", 376 vap->va_blocksize, vap->va_rdev, (long long)vap->va_bytes, vap->va_gen); 377 #endif 378 return (EINVAL); 379 } 380 /* 381 * Silently ignore attributes modifications on directories. 382 */ 383 if (ap->a_vp->v_type == VDIR) 384 return 0; 385 386 if (vap->va_size != VNOVAL) { 387 if (vp->v_mount->mnt_flag & MNT_RDONLY) 388 return (EROFS); 389 error = detrunc(dep, (u_long)vap->va_size, 0, cred, ap->a_p); 390 if (error) 391 return (error); 392 de_changed = 1; 393 } 394 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 395 if (vp->v_mount->mnt_flag & MNT_RDONLY) 396 return (EROFS); 397 if (cred->cr_uid != pmp->pm_uid && 398 (error = suser(cred, &ap->a_p->p_acflag)) && 399 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 400 (error = VOP_ACCESS(ap->a_vp, VWRITE, cred, ap->a_p)))) 401 return (error); 402 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 && 403 vap->va_atime.tv_sec != VNOVAL) 404 unix2dostime(&vap->va_atime, pmp->pm_gmtoff, &dep->de_ADate, NULL, NULL); 405 if (vap->va_mtime.tv_sec != VNOVAL) 406 unix2dostime(&vap->va_mtime, pmp->pm_gmtoff, &dep->de_MDate, &dep->de_MTime, NULL); 407 dep->de_Attributes |= ATTR_ARCHIVE; 408 dep->de_flag |= DE_MODIFIED; 409 de_changed = 1; 410 } 411 /* 412 * DOS files only have the ability to have their writability 413 * attribute set, so we use the owner write bit to set the readonly 414 * attribute. 415 */ 416 if (vap->va_mode != (mode_t)VNOVAL) { 417 if (vp->v_mount->mnt_flag & MNT_RDONLY) 418 return (EROFS); 419 if (cred->cr_uid != pmp->pm_uid && 420 (error = suser(cred, &ap->a_p->p_acflag))) 421 return (error); 422 /* We ignore the read and execute bits. */ 423 if (vap->va_mode & S_IWUSR) 424 dep->de_Attributes &= ~ATTR_READONLY; 425 else 426 dep->de_Attributes |= ATTR_READONLY; 427 dep->de_flag |= DE_MODIFIED; 428 de_changed = 1; 429 } 430 /* 431 * Allow the `archived' bit to be toggled. 432 */ 433 if (vap->va_flags != VNOVAL) { 434 if (vp->v_mount->mnt_flag & MNT_RDONLY) 435 return (EROFS); 436 if (cred->cr_uid != pmp->pm_uid && 437 (error = suser(cred, &ap->a_p->p_acflag))) 438 return (error); 439 if (vap->va_flags & SF_ARCHIVED) 440 dep->de_Attributes &= ~ATTR_ARCHIVE; 441 else 442 dep->de_Attributes |= ATTR_ARCHIVE; 443 dep->de_flag |= DE_MODIFIED; 444 de_changed = 1; 445 } 446 447 if (de_changed) { 448 VN_KNOTE(vp, NOTE_ATTRIB); 449 return (deupdat(dep, 1)); 450 } else 451 return (0); 452 } 453 454 int 455 msdosfs_read(v) 456 void *v; 457 { 458 struct vop_read_args /* { 459 struct vnode *a_vp; 460 struct uio *a_uio; 461 int a_ioflag; 462 struct ucred *a_cred; 463 } */ *ap = v; 464 int error = 0; 465 int64_t diff; 466 int blsize; 467 long n; 468 long on; 469 daddr_t lbn; 470 void *win; 471 vsize_t bytelen; 472 struct buf *bp; 473 struct vnode *vp = ap->a_vp; 474 struct denode *dep = VTODE(vp); 475 struct msdosfsmount *pmp = dep->de_pmp; 476 struct uio *uio = ap->a_uio; 477 478 /* 479 * If they didn't ask for any data, then we are done. 480 */ 481 482 if (uio->uio_resid == 0) 483 return (0); 484 if (uio->uio_offset < 0) 485 return (EINVAL); 486 if (uio->uio_offset >= dep->de_FileSize) 487 return (0); 488 489 if (vp->v_type == VREG) { 490 while (uio->uio_resid > 0) { 491 bytelen = MIN(dep->de_FileSize - uio->uio_offset, 492 uio->uio_resid); 493 494 if (bytelen == 0) 495 break; 496 win = ubc_alloc(&vp->v_uobj, uio->uio_offset, 497 &bytelen, UBC_READ); 498 error = uiomove(win, bytelen, uio); 499 ubc_release(win, 0); 500 if (error) 501 break; 502 } 503 dep->de_flag |= DE_ACCESS; 504 goto out; 505 } 506 507 /* this loop is only for directories now */ 508 do { 509 lbn = de_cluster(pmp, uio->uio_offset); 510 on = uio->uio_offset & pmp->pm_crbomask; 511 n = MIN(pmp->pm_bpcluster - on, uio->uio_resid); 512 if (uio->uio_offset >= dep->de_FileSize) 513 return (0); 514 /* file size (and hence diff) may be up to 4GB */ 515 diff = dep->de_FileSize - uio->uio_offset; 516 if (diff < n) 517 n = (long) diff; 518 519 /* convert cluster # to block # */ 520 error = pcbmap(dep, lbn, &lbn, 0, &blsize); 521 if (error) 522 return (error); 523 524 /* 525 * If we are operating on a directory file then be sure to 526 * do i/o with the vnode for the filesystem instead of the 527 * vnode for the directory. 528 */ 529 error = bread(pmp->pm_devvp, lbn, blsize, NOCRED, &bp); 530 n = MIN(n, pmp->pm_bpcluster - bp->b_resid); 531 if (error) { 532 brelse(bp); 533 return (error); 534 } 535 error = uiomove(bp->b_data + on, (int) n, uio); 536 brelse(bp); 537 } while (error == 0 && uio->uio_resid > 0 && n != 0); 538 539 out: 540 if ((ap->a_ioflag & IO_SYNC) == IO_SYNC) 541 error = deupdat(dep, 1); 542 return (error); 543 } 544 545 /* 546 * Write data to a file or directory. 547 */ 548 int 549 msdosfs_write(v) 550 void *v; 551 { 552 struct vop_write_args /* { 553 struct vnode *a_vp; 554 struct uio *a_uio; 555 int a_ioflag; 556 struct ucred *a_cred; 557 } */ *ap = v; 558 int resid; 559 u_long osize; 560 int error = 0; 561 u_long count; 562 int ioflag = ap->a_ioflag; 563 void *win; 564 vsize_t bytelen; 565 off_t oldoff; 566 struct uio *uio = ap->a_uio; 567 struct proc *p = uio->uio_procp; 568 struct vnode *vp = ap->a_vp; 569 struct denode *dep = VTODE(vp); 570 struct msdosfsmount *pmp = dep->de_pmp; 571 struct ucred *cred = ap->a_cred; 572 boolean_t async; 573 int extended=0; 574 575 #ifdef MSDOSFS_DEBUG 576 printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n", 577 vp, uio, ioflag, cred); 578 printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n", 579 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster); 580 #endif 581 582 switch (vp->v_type) { 583 case VREG: 584 if (ioflag & IO_APPEND) 585 uio->uio_offset = dep->de_FileSize; 586 break; 587 case VDIR: 588 return EISDIR; 589 default: 590 panic("msdosfs_write(): bad file type"); 591 } 592 593 if (uio->uio_offset < 0) 594 return (EINVAL); 595 596 if (uio->uio_resid == 0) 597 return (0); 598 599 /* 600 * If they've exceeded their filesize limit, tell them about it. 601 */ 602 if (p && 603 ((uio->uio_offset + uio->uio_resid) > 604 p->p_rlimit[RLIMIT_FSIZE].rlim_cur)) { 605 psignal(p, SIGXFSZ); 606 return (EFBIG); 607 } 608 609 /* 610 * If the offset we are starting the write at is beyond the end of 611 * the file, then they've done a seek. Unix filesystems allow 612 * files with holes in them, DOS doesn't so we must fill the hole 613 * with zeroed blocks. 614 */ 615 if (uio->uio_offset > dep->de_FileSize) { 616 if ((error = deextend(dep, uio->uio_offset, cred)) != 0) 617 return (error); 618 } 619 620 /* 621 * Remember some values in case the write fails. 622 */ 623 async = vp->v_mount->mnt_flag & MNT_ASYNC; 624 resid = uio->uio_resid; 625 osize = dep->de_FileSize; 626 627 /* 628 * If we write beyond the end of the file, extend it to its ultimate 629 * size ahead of the time to hopefully get a contiguous area. 630 */ 631 if (uio->uio_offset + resid > osize) { 632 count = de_clcount(pmp, uio->uio_offset + resid) - 633 de_clcount(pmp, osize); 634 if ((error = extendfile(dep, count, NULL, NULL, 0)) && 635 (error != ENOSPC || (ioflag & IO_UNIT))) 636 goto errexit; 637 } 638 639 if (dep->de_FileSize < uio->uio_offset + resid) { 640 dep->de_FileSize = uio->uio_offset + resid; 641 uvm_vnp_setsize(vp, dep->de_FileSize); 642 extended = 1; 643 } 644 645 do { 646 oldoff = uio->uio_offset; 647 bytelen = uio->uio_resid; 648 649 win = ubc_alloc(&vp->v_uobj, oldoff, &bytelen, UBC_WRITE); 650 error = uiomove(win, bytelen, uio); 651 ubc_release(win, 0); 652 if (error) { 653 break; 654 } 655 656 /* 657 * flush what we just wrote if necessary. 658 * XXXUBC simplistic async flushing. 659 */ 660 661 if (!async && oldoff >> 16 != uio->uio_offset >> 16) { 662 simple_lock(&vp->v_interlock); 663 error = VOP_PUTPAGES(vp, (oldoff >> 16) << 16, 664 (uio->uio_offset >> 16) << 16, PGO_CLEANIT); 665 } 666 } while (error == 0 && uio->uio_resid > 0); 667 if (error == 0 && ioflag & IO_SYNC) { 668 simple_lock(&vp->v_interlock); 669 error = VOP_PUTPAGES(vp, trunc_page(oldoff), 670 round_page(oldoff + bytelen), PGO_CLEANIT | PGO_SYNCIO); 671 } 672 dep->de_flag |= DE_UPDATE; 673 674 /* 675 * If the write failed and they want us to, truncate the file back 676 * to the size it was before the write was attempted. 677 */ 678 errexit: 679 if (resid > uio->uio_resid) 680 VN_KNOTE(vp, NOTE_WRITE | (extended ? NOTE_EXTEND : 0)); 681 if (error) { 682 detrunc(dep, osize, ioflag & IO_SYNC, NOCRED, NULL); 683 uio->uio_offset -= resid - uio->uio_resid; 684 uio->uio_resid = resid; 685 } else if ((ioflag & IO_SYNC) == IO_SYNC) 686 error = deupdat(dep, 1); 687 KASSERT(vp->v_size == dep->de_FileSize); 688 return (error); 689 } 690 691 int 692 msdosfs_update(v) 693 void *v; 694 { 695 struct vop_update_args /* { 696 struct vnode *a_vp; 697 struct timespec *a_access; 698 struct timespec *a_modify; 699 int a_flags; 700 } */ *ap = v; 701 struct buf *bp; 702 struct direntry *dirp; 703 struct denode *dep; 704 int error; 705 struct timespec ts; 706 707 if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY) 708 return (0); 709 dep = VTODE(ap->a_vp); 710 TIMEVAL_TO_TIMESPEC(&time, &ts); 711 DETIMES(dep, 712 ap->a_access ? ap->a_access : &ts, 713 ap->a_modify ? ap->a_modify : &ts, &ts, dep->de_pmp->pm_gmtoff); 714 if ((dep->de_flag & DE_MODIFIED) == 0) 715 return (0); 716 dep->de_flag &= ~DE_MODIFIED; 717 if (dep->de_Attributes & ATTR_DIRECTORY) 718 return (0); 719 if (dep->de_refcnt <= 0) 720 return (0); 721 error = readde(dep, &bp, &dirp); 722 if (error) 723 return (error); 724 DE_EXTERNALIZE(dirp, dep); 725 if (ap->a_flags & (UPDATE_WAIT|UPDATE_DIROP)) 726 return (bwrite(bp)); 727 else { 728 bdwrite(bp); 729 return (0); 730 } 731 } 732 733 /* 734 * Flush the blocks of a file to disk. 735 * 736 * This function is worthless for vnodes that represent directories. Maybe we 737 * could just do a sync if they try an fsync on a directory file. 738 */ 739 int 740 msdosfs_remove(v) 741 void *v; 742 { 743 struct vop_remove_args /* { 744 struct vnode *a_dvp; 745 struct vnode *a_vp; 746 struct componentname *a_cnp; 747 } */ *ap = v; 748 struct denode *dep = VTODE(ap->a_vp); 749 struct denode *ddep = VTODE(ap->a_dvp); 750 int error; 751 752 if (ap->a_vp->v_type == VDIR) 753 error = EPERM; 754 else 755 error = removede(ddep, dep); 756 #ifdef MSDOSFS_DEBUG 757 printf("msdosfs_remove(), dep %p, v_usecount %d\n", 758 dep, ap->a_vp->v_usecount); 759 #endif 760 VN_KNOTE(ap->a_vp, NOTE_DELETE); 761 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 762 if (ddep == dep) 763 vrele(ap->a_vp); 764 else 765 vput(ap->a_vp); /* causes msdosfs_inactive() to be called 766 * via vrele() */ 767 vput(ap->a_dvp); 768 return (error); 769 } 770 771 /* 772 * DOS filesystems don't know what links are. But since we already called 773 * msdosfs_lookup() with create and lockparent, the parent is locked so we 774 * have to free it before we return the error. 775 */ 776 int 777 msdosfs_link(v) 778 void *v; 779 { 780 struct vop_link_args /* { 781 struct vnode *a_dvp; 782 struct vnode *a_vp; 783 struct componentname *a_cnp; 784 } */ *ap = v; 785 786 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 787 vput(ap->a_dvp); 788 return (EOPNOTSUPP); 789 } 790 791 /* 792 * Renames on files require moving the denode to a new hash queue since the 793 * denode's location is used to compute which hash queue to put the file 794 * in. Unless it is a rename in place. For example "mv a b". 795 * 796 * What follows is the basic algorithm: 797 * 798 * if (file move) { 799 * if (dest file exists) { 800 * remove dest file 801 * } 802 * if (dest and src in same directory) { 803 * rewrite name in existing directory slot 804 * } else { 805 * write new entry in dest directory 806 * update offset and dirclust in denode 807 * move denode to new hash chain 808 * clear old directory entry 809 * } 810 * } else { 811 * directory move 812 * if (dest directory exists) { 813 * if (dest is not empty) { 814 * return ENOTEMPTY 815 * } 816 * remove dest directory 817 * } 818 * if (dest and src in same directory) { 819 * rewrite name in existing entry 820 * } else { 821 * be sure dest is not a child of src directory 822 * write entry in dest directory 823 * update "." and ".." in moved directory 824 * update offset and dirclust in denode 825 * move denode to new hash chain 826 * clear old directory entry for moved directory 827 * } 828 * } 829 * 830 * On entry: 831 * source's parent directory is unlocked 832 * source file or directory is unlocked 833 * destination's parent directory is locked 834 * destination file or directory is locked if it exists 835 * 836 * On exit: 837 * all denodes should be released 838 * 839 * Notes: 840 * I'm not sure how the memory containing the pathnames pointed at by the 841 * componentname structures is freed, there may be some memory bleeding 842 * for each rename done. 843 */ 844 int 845 msdosfs_rename(v) 846 void *v; 847 { 848 struct vop_rename_args /* { 849 struct vnode *a_fdvp; 850 struct vnode *a_fvp; 851 struct componentname *a_fcnp; 852 struct vnode *a_tdvp; 853 struct vnode *a_tvp; 854 struct componentname *a_tcnp; 855 } */ *ap = v; 856 struct vnode *tvp = ap->a_tvp; 857 struct vnode *tdvp = ap->a_tdvp; 858 struct vnode *fvp = ap->a_fvp; 859 struct vnode *fdvp = ap->a_fdvp; 860 struct componentname *tcnp = ap->a_tcnp; 861 struct componentname *fcnp = ap->a_fcnp; 862 struct proc *p = tcnp->cn_proc; 863 struct denode *ip, *xp, *dp, *zp; 864 u_char toname[11], oldname[11]; 865 u_long from_diroffset, to_diroffset; 866 u_char to_count; 867 int doingdirectory = 0, newparent = 0; 868 int error; 869 u_long cn; 870 daddr_t bn; 871 struct msdosfsmount *pmp; 872 struct direntry *dotdotp; 873 struct buf *bp; 874 int fdvp_dorele = 0; 875 876 pmp = VFSTOMSDOSFS(fdvp->v_mount); 877 878 #ifdef DIAGNOSTIC 879 if ((tcnp->cn_flags & HASBUF) == 0 || 880 (fcnp->cn_flags & HASBUF) == 0) 881 panic("msdosfs_rename: no name"); 882 #endif 883 /* 884 * Check for cross-device rename. 885 */ 886 if ((fvp->v_mount != tdvp->v_mount) || 887 (tvp && (fvp->v_mount != tvp->v_mount))) { 888 error = EXDEV; 889 abortit: 890 VOP_ABORTOP(tdvp, tcnp); 891 if (tdvp == tvp) 892 vrele(tdvp); 893 else 894 vput(tdvp); 895 if (tvp) 896 vput(tvp); 897 VOP_ABORTOP(fdvp, fcnp); 898 vrele(fdvp); 899 vrele(fvp); 900 return (error); 901 } 902 903 /* 904 * If source and dest are the same, do nothing. 905 */ 906 if (tvp == fvp) { 907 error = 0; 908 goto abortit; 909 } 910 911 /* */ 912 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0) 913 goto abortit; 914 dp = VTODE(fdvp); 915 ip = VTODE(fvp); 916 917 /* 918 * Be sure we are not renaming ".", "..", or an alias of ".". This 919 * leads to a crippled directory tree. It's pretty tough to do a 920 * "ls" or "pwd" with the "." directory entry missing, and "cd .." 921 * doesn't work if the ".." entry is missing. 922 */ 923 if (ip->de_Attributes & ATTR_DIRECTORY) { 924 /* 925 * Avoid ".", "..", and aliases of "." for obvious reasons. 926 */ 927 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 928 dp == ip || 929 (fcnp->cn_flags & ISDOTDOT) || 930 (tcnp->cn_flags & ISDOTDOT) || 931 (ip->de_flag & DE_RENAME)) { 932 VOP_UNLOCK(fvp, 0); 933 error = EINVAL; 934 goto abortit; 935 } 936 ip->de_flag |= DE_RENAME; 937 doingdirectory++; 938 } 939 VN_KNOTE(fdvp, NOTE_WRITE); /* XXXLUKEM/XXX: right place? */ 940 941 /* 942 * When the target exists, both the directory 943 * and target vnodes are returned locked. 944 */ 945 dp = VTODE(tdvp); 946 xp = tvp ? VTODE(tvp) : NULL; 947 /* 948 * Remember direntry place to use for destination 949 */ 950 to_diroffset = dp->de_fndoffset; 951 to_count = dp->de_fndcnt; 952 953 /* 954 * If ".." must be changed (ie the directory gets a new 955 * parent) then the source directory must not be in the 956 * directory hierarchy above the target, as this would 957 * orphan everything below the source directory. Also 958 * the user must have write permission in the source so 959 * as to be able to change "..". We must repeat the call 960 * to namei, as the parent directory is unlocked by the 961 * call to doscheckpath(). 962 */ 963 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, p); 964 VOP_UNLOCK(fvp, 0); 965 if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster) 966 newparent = 1; 967 vrele(fdvp); 968 if (doingdirectory && newparent) { 969 if (error) /* write access check above */ 970 goto bad; 971 if (xp != NULL) 972 vput(tvp); 973 /* 974 * doscheckpath() vput()'s dp, 975 * so we have to do a relookup afterwards 976 */ 977 if ((error = doscheckpath(ip, dp)) != 0) 978 goto out; 979 if ((tcnp->cn_flags & SAVESTART) == 0) 980 panic("msdosfs_rename: lost to startdir"); 981 if ((error = relookup(tdvp, &tvp, tcnp)) != 0) 982 goto out; 983 dp = VTODE(tdvp); 984 xp = tvp ? VTODE(tvp) : NULL; 985 } 986 987 if (xp != NULL) { 988 /* 989 * Target must be empty if a directory and have no links 990 * to it. Also, ensure source and target are compatible 991 * (both directories, or both not directories). 992 */ 993 if (xp->de_Attributes & ATTR_DIRECTORY) { 994 if (!dosdirempty(xp)) { 995 error = ENOTEMPTY; 996 goto bad; 997 } 998 if (!doingdirectory) { 999 error = ENOTDIR; 1000 goto bad; 1001 } 1002 } else if (doingdirectory) { 1003 error = EISDIR; 1004 goto bad; 1005 } 1006 if ((error = removede(dp, xp)) != 0) 1007 goto bad; 1008 VN_KNOTE(tdvp, NOTE_WRITE); 1009 VN_KNOTE(tvp, NOTE_DELETE); 1010 cache_purge(tvp); 1011 vput(tvp); 1012 xp = NULL; 1013 } 1014 1015 /* 1016 * Convert the filename in tcnp into a dos filename. We copy this 1017 * into the denode and directory entry for the destination 1018 * file/directory. 1019 */ 1020 if ((error = uniqdosname(VTODE(tdvp), tcnp, toname)) != 0) 1021 goto abortit; 1022 1023 /* 1024 * Since from wasn't locked at various places above, 1025 * have to do a relookup here. 1026 */ 1027 fcnp->cn_flags &= ~MODMASK; 1028 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 1029 if ((fcnp->cn_flags & SAVESTART) == 0) 1030 panic("msdosfs_rename: lost from startdir"); 1031 if (!newparent) 1032 VOP_UNLOCK(tdvp, 0); 1033 (void) relookup(fdvp, &fvp, fcnp); 1034 if (fvp == NULL) { 1035 /* 1036 * From name has disappeared. 1037 */ 1038 if (doingdirectory) 1039 panic("rename: lost dir entry"); 1040 vrele(ap->a_fvp); 1041 if (newparent) 1042 VOP_UNLOCK(tdvp, 0); 1043 vrele(tdvp); 1044 return 0; 1045 } 1046 fdvp_dorele = 1; 1047 xp = VTODE(fvp); 1048 zp = VTODE(fdvp); 1049 from_diroffset = zp->de_fndoffset; 1050 1051 /* 1052 * Ensure that the directory entry still exists and has not 1053 * changed till now. If the source is a file the entry may 1054 * have been unlinked or renamed. In either case there is 1055 * no further work to be done. If the source is a directory 1056 * then it cannot have been rmdir'ed or renamed; this is 1057 * prohibited by the DE_RENAME flag. 1058 */ 1059 if (xp != ip) { 1060 if (doingdirectory) 1061 panic("rename: lost dir entry"); 1062 vrele(ap->a_fvp); 1063 VOP_UNLOCK(fvp, 0); 1064 if (newparent) 1065 VOP_UNLOCK(fdvp, 0); 1066 xp = NULL; 1067 } else { 1068 vrele(fvp); 1069 xp = NULL; 1070 1071 /* 1072 * First write a new entry in the destination 1073 * directory and mark the entry in the source directory 1074 * as deleted. Then move the denode to the correct hash 1075 * chain for its new location in the filesystem. And, if 1076 * we moved a directory, then update its .. entry to point 1077 * to the new parent directory. 1078 */ 1079 memcpy(oldname, ip->de_Name, 11); 1080 memcpy(ip->de_Name, toname, 11); /* update denode */ 1081 dp->de_fndoffset = to_diroffset; 1082 dp->de_fndcnt = to_count; 1083 error = createde(ip, dp, (struct denode **)0, tcnp); 1084 if (error) { 1085 memcpy(ip->de_Name, oldname, 11); 1086 if (newparent) 1087 VOP_UNLOCK(fdvp, 0); 1088 VOP_UNLOCK(fvp, 0); 1089 goto bad; 1090 } 1091 ip->de_refcnt++; 1092 zp->de_fndoffset = from_diroffset; 1093 if ((error = removede(zp, ip)) != 0) { 1094 /* XXX should really panic here, fs is corrupt */ 1095 if (newparent) 1096 VOP_UNLOCK(fdvp, 0); 1097 VOP_UNLOCK(fvp, 0); 1098 goto bad; 1099 } 1100 cache_purge(fvp); 1101 if (!doingdirectory) { 1102 error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0, 1103 &ip->de_dirclust, 0); 1104 if (error) { 1105 /* XXX should really panic here, fs is corrupt */ 1106 if (newparent) 1107 VOP_UNLOCK(fdvp, 0); 1108 VOP_UNLOCK(fvp, 0); 1109 goto bad; 1110 } 1111 ip->de_diroffset = to_diroffset; 1112 if (ip->de_dirclust != MSDOSFSROOT) 1113 ip->de_diroffset &= pmp->pm_crbomask; 1114 } 1115 reinsert(ip); 1116 if (newparent) 1117 VOP_UNLOCK(fdvp, 0); 1118 } 1119 1120 /* 1121 * If we moved a directory to a new parent directory, then we must 1122 * fixup the ".." entry in the moved directory. 1123 */ 1124 if (doingdirectory && newparent) { 1125 cn = ip->de_StartCluster; 1126 if (cn == MSDOSFSROOT) { 1127 /* this should never happen */ 1128 panic("msdosfs_rename: updating .. in root directory?"); 1129 } else 1130 bn = cntobn(pmp, cn); 1131 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, 1132 NOCRED, &bp); 1133 if (error) { 1134 /* XXX should really panic here, fs is corrupt */ 1135 brelse(bp); 1136 VOP_UNLOCK(fvp, 0); 1137 goto bad; 1138 } 1139 dotdotp = (struct direntry *)bp->b_data + 1; 1140 putushort(dotdotp->deStartCluster, dp->de_StartCluster); 1141 if (FAT32(pmp)) { 1142 putushort(dotdotp->deHighClust, 1143 dp->de_StartCluster >> 16); 1144 } 1145 if ((error = bwrite(bp)) != 0) { 1146 /* XXX should really panic here, fs is corrupt */ 1147 VOP_UNLOCK(fvp, 0); 1148 goto bad; 1149 } 1150 } 1151 1152 VN_KNOTE(fvp, NOTE_RENAME); 1153 VOP_UNLOCK(fvp, 0); 1154 bad: 1155 if (xp) 1156 vput(tvp); 1157 vput(tdvp); 1158 out: 1159 ip->de_flag &= ~DE_RENAME; 1160 if (fdvp_dorele) 1161 vrele(fdvp); 1162 vrele(fvp); 1163 return (error); 1164 1165 } 1166 1167 static const struct { 1168 struct direntry dot; 1169 struct direntry dotdot; 1170 } dosdirtemplate = { 1171 { ". ", " ", /* the . entry */ 1172 ATTR_DIRECTORY, /* file attribute */ 1173 0, /* reserved */ 1174 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1175 { 0, 0 }, /* access date */ 1176 { 0, 0 }, /* high bits of start cluster */ 1177 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1178 { 0, 0 }, /* startcluster */ 1179 { 0, 0, 0, 0 } /* filesize */ 1180 }, 1181 { ".. ", " ", /* the .. entry */ 1182 ATTR_DIRECTORY, /* file attribute */ 1183 0, /* reserved */ 1184 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1185 { 0, 0 }, /* access date */ 1186 { 0, 0 }, /* high bits of start cluster */ 1187 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1188 { 0, 0 }, /* startcluster */ 1189 { 0, 0, 0, 0 } /* filesize */ 1190 } 1191 }; 1192 1193 int 1194 msdosfs_mkdir(v) 1195 void *v; 1196 { 1197 struct vop_mkdir_args /* { 1198 struct vnode *a_dvp; 1199 struvt vnode **a_vpp; 1200 struvt componentname *a_cnp; 1201 struct vattr *a_vap; 1202 } */ *ap = v; 1203 struct componentname *cnp = ap->a_cnp; 1204 struct denode ndirent; 1205 struct denode *dep; 1206 struct denode *pdep = VTODE(ap->a_dvp); 1207 int error; 1208 int bn; 1209 u_long newcluster, pcl; 1210 struct direntry *denp; 1211 struct msdosfsmount *pmp = pdep->de_pmp; 1212 struct buf *bp; 1213 struct timespec ts; 1214 int async = pdep->de_pmp->pm_mountp->mnt_flag & MNT_ASYNC; 1215 1216 /* 1217 * If this is the root directory and there is no space left we 1218 * can't do anything. This is because the root directory can not 1219 * change size. 1220 */ 1221 if (pdep->de_StartCluster == MSDOSFSROOT 1222 && pdep->de_fndoffset >= pdep->de_FileSize) { 1223 error = ENOSPC; 1224 goto bad2; 1225 } 1226 1227 /* 1228 * Allocate a cluster to hold the about to be created directory. 1229 */ 1230 error = clusteralloc(pmp, 0, 1, &newcluster, NULL); 1231 if (error) 1232 goto bad2; 1233 1234 memset(&ndirent, 0, sizeof(ndirent)); 1235 ndirent.de_pmp = pmp; 1236 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 1237 TIMEVAL_TO_TIMESPEC(&time, &ts); 1238 DETIMES(&ndirent, &ts, &ts, &ts, pmp->pm_gmtoff); 1239 1240 /* 1241 * Now fill the cluster with the "." and ".." entries. And write 1242 * the cluster to disk. This way it is there for the parent 1243 * directory to be pointing at if there were a crash. 1244 */ 1245 bn = cntobn(pmp, newcluster); 1246 /* always succeeds */ 1247 bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0); 1248 memset(bp->b_data, 0, pmp->pm_bpcluster); 1249 memcpy(bp->b_data, &dosdirtemplate, sizeof dosdirtemplate); 1250 denp = (struct direntry *)bp->b_data; 1251 putushort(denp[0].deStartCluster, newcluster); 1252 putushort(denp[0].deCDate, ndirent.de_CDate); 1253 putushort(denp[0].deCTime, ndirent.de_CTime); 1254 denp[0].deCHundredth = ndirent.de_CHun; 1255 putushort(denp[0].deADate, ndirent.de_ADate); 1256 putushort(denp[0].deMDate, ndirent.de_MDate); 1257 putushort(denp[0].deMTime, ndirent.de_MTime); 1258 pcl = pdep->de_StartCluster; 1259 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1260 pcl = 0; 1261 putushort(denp[1].deStartCluster, pcl); 1262 putushort(denp[1].deCDate, ndirent.de_CDate); 1263 putushort(denp[1].deCTime, ndirent.de_CTime); 1264 denp[1].deCHundredth = ndirent.de_CHun; 1265 putushort(denp[1].deADate, ndirent.de_ADate); 1266 putushort(denp[1].deMDate, ndirent.de_MDate); 1267 putushort(denp[1].deMTime, ndirent.de_MTime); 1268 if (FAT32(pmp)) { 1269 putushort(denp[0].deHighClust, newcluster >> 16); 1270 putushort(denp[1].deHighClust, pdep->de_StartCluster >> 16); 1271 } 1272 1273 if (async) 1274 bdwrite(bp); 1275 else if ((error = bwrite(bp)) != 0) 1276 goto bad; 1277 1278 /* 1279 * Now build up a directory entry pointing to the newly allocated 1280 * cluster. This will be written to an empty slot in the parent 1281 * directory. 1282 */ 1283 #ifdef DIAGNOSTIC 1284 if ((cnp->cn_flags & HASBUF) == 0) 1285 panic("msdosfs_mkdir: no name"); 1286 #endif 1287 if ((error = uniqdosname(pdep, cnp, ndirent.de_Name)) != 0) 1288 goto bad; 1289 1290 ndirent.de_Attributes = ATTR_DIRECTORY; 1291 ndirent.de_StartCluster = newcluster; 1292 ndirent.de_FileSize = 0; 1293 ndirent.de_dev = pdep->de_dev; 1294 ndirent.de_devvp = pdep->de_devvp; 1295 if ((error = createde(&ndirent, pdep, &dep, cnp)) != 0) 1296 goto bad; 1297 if ((cnp->cn_flags & SAVESTART) == 0) 1298 PNBUF_PUT(cnp->cn_pnbuf); 1299 VN_KNOTE(ap->a_dvp, NOTE_WRITE | NOTE_LINK); 1300 vput(ap->a_dvp); 1301 *ap->a_vpp = DETOV(dep); 1302 return (0); 1303 1304 bad: 1305 clusterfree(pmp, newcluster, NULL); 1306 bad2: 1307 PNBUF_PUT(cnp->cn_pnbuf); 1308 vput(ap->a_dvp); 1309 return (error); 1310 } 1311 1312 int 1313 msdosfs_rmdir(v) 1314 void *v; 1315 { 1316 struct vop_rmdir_args /* { 1317 struct vnode *a_dvp; 1318 struct vnode *a_vp; 1319 struct componentname *a_cnp; 1320 } */ *ap = v; 1321 struct vnode *vp = ap->a_vp; 1322 struct vnode *dvp = ap->a_dvp; 1323 struct componentname *cnp = ap->a_cnp; 1324 struct denode *ip, *dp; 1325 int error; 1326 1327 ip = VTODE(vp); 1328 dp = VTODE(dvp); 1329 /* 1330 * No rmdir "." please. 1331 */ 1332 if (dp == ip) { 1333 vrele(dvp); 1334 vput(vp); 1335 return (EINVAL); 1336 } 1337 /* 1338 * Verify the directory is empty (and valid). 1339 * (Rmdir ".." won't be valid since 1340 * ".." will contain a reference to 1341 * the current directory and thus be 1342 * non-empty.) 1343 */ 1344 error = 0; 1345 if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) { 1346 error = ENOTEMPTY; 1347 goto out; 1348 } 1349 /* 1350 * Delete the entry from the directory. For dos filesystems this 1351 * gets rid of the directory entry on disk, the in memory copy 1352 * still exists but the de_refcnt is <= 0. This prevents it from 1353 * being found by deget(). When the vput() on dep is done we give 1354 * up access and eventually msdosfs_reclaim() will be called which 1355 * will remove it from the denode cache. 1356 */ 1357 if ((error = removede(dp, ip)) != 0) 1358 goto out; 1359 /* 1360 * This is where we decrement the link count in the parent 1361 * directory. Since dos filesystems don't do this we just purge 1362 * the name cache and let go of the parent directory denode. 1363 */ 1364 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 1365 cache_purge(dvp); 1366 vput(dvp); 1367 dvp = NULL; 1368 /* 1369 * Truncate the directory that is being deleted. 1370 */ 1371 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred, cnp->cn_proc); 1372 cache_purge(vp); 1373 out: 1374 VN_KNOTE(vp, NOTE_DELETE); 1375 if (dvp) 1376 vput(dvp); 1377 vput(vp); 1378 return (error); 1379 } 1380 1381 /* 1382 * DOS filesystems don't know what symlinks are. 1383 */ 1384 int 1385 msdosfs_symlink(v) 1386 void *v; 1387 { 1388 struct vop_symlink_args /* { 1389 struct vnode *a_dvp; 1390 struct vnode **a_vpp; 1391 struct componentname *a_cnp; 1392 struct vattr *a_vap; 1393 char *a_target; 1394 } */ *ap = v; 1395 1396 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 1397 vput(ap->a_dvp); 1398 return (EOPNOTSUPP); 1399 } 1400 1401 int 1402 msdosfs_readdir(v) 1403 void *v; 1404 { 1405 struct vop_readdir_args /* { 1406 struct vnode *a_vp; 1407 struct uio *a_uio; 1408 struct ucred *a_cred; 1409 int *a_eofflag; 1410 off_t **a_cookies; 1411 int *a_ncookies; 1412 } */ *ap = v; 1413 int error = 0; 1414 int diff; 1415 long n; 1416 int blsize; 1417 long on; 1418 long lost; 1419 long count; 1420 u_long cn; 1421 u_long fileno; 1422 u_long dirsperblk; 1423 long bias = 0; 1424 daddr_t bn, lbn; 1425 struct buf *bp; 1426 struct denode *dep = VTODE(ap->a_vp); 1427 struct msdosfsmount *pmp = dep->de_pmp; 1428 struct direntry *dentp; 1429 struct dirent dirbuf; 1430 struct uio *uio = ap->a_uio; 1431 off_t *cookies = NULL; 1432 int ncookies = 0, nc = 0; 1433 off_t offset, uio_off; 1434 int chksum = -1; 1435 1436 #ifdef MSDOSFS_DEBUG 1437 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n", 1438 ap->a_vp, uio, ap->a_cred, ap->a_eofflag); 1439 #endif 1440 1441 /* 1442 * msdosfs_readdir() won't operate properly on regular files since 1443 * it does i/o only with the filesystem vnode, and hence can 1444 * retrieve the wrong block from the buffer cache for a plain file. 1445 * So, fail attempts to readdir() on a plain file. 1446 */ 1447 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) 1448 return (ENOTDIR); 1449 1450 /* 1451 * To be safe, initialize dirbuf 1452 */ 1453 memset(dirbuf.d_name, 0, sizeof(dirbuf.d_name)); 1454 1455 /* 1456 * If the user buffer is smaller than the size of one dos directory 1457 * entry or the file offset is not a multiple of the size of a 1458 * directory entry, then we fail the read. 1459 */ 1460 count = uio->uio_resid & ~(sizeof(struct direntry) - 1); 1461 offset = uio->uio_offset; 1462 if (count < sizeof(struct direntry) || 1463 (offset & (sizeof(struct direntry) - 1))) 1464 return (EINVAL); 1465 lost = uio->uio_resid - count; 1466 uio->uio_resid = count; 1467 uio_off = uio->uio_offset; 1468 1469 if (ap->a_ncookies) { 1470 nc = uio->uio_resid / 16; 1471 cookies = malloc(nc * sizeof (off_t), M_TEMP, M_WAITOK); 1472 *ap->a_cookies = cookies; 1473 } 1474 1475 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 1476 1477 /* 1478 * If they are reading from the root directory then, we simulate 1479 * the . and .. entries since these don't exist in the root 1480 * directory. We also set the offset bias to make up for having to 1481 * simulate these entries. By this I mean that at file offset 64 we 1482 * read the first entry in the root directory that lives on disk. 1483 */ 1484 if (dep->de_StartCluster == MSDOSFSROOT 1485 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) { 1486 #if 0 1487 printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n", 1488 offset); 1489 #endif 1490 bias = 2 * sizeof(struct direntry); 1491 if (offset < bias) { 1492 for (n = (int)offset / sizeof(struct direntry); 1493 n < 2; n++) { 1494 if (FAT32(pmp)) 1495 dirbuf.d_fileno = cntobn(pmp, 1496 pmp->pm_rootdirblk) 1497 * dirsperblk; 1498 else 1499 dirbuf.d_fileno = 1; 1500 dirbuf.d_type = DT_DIR; 1501 switch (n) { 1502 case 0: 1503 dirbuf.d_namlen = 1; 1504 strlcpy(dirbuf.d_name, ".", 1505 sizeof(dirbuf.d_name)); 1506 break; 1507 case 1: 1508 dirbuf.d_namlen = 2; 1509 strlcpy(dirbuf.d_name, "..", 1510 sizeof(dirbuf.d_name)); 1511 break; 1512 } 1513 dirbuf.d_reclen = DIRENT_SIZE(&dirbuf); 1514 if (uio->uio_resid < dirbuf.d_reclen) 1515 goto out; 1516 error = uiomove(&dirbuf, 1517 dirbuf.d_reclen, uio); 1518 if (error) 1519 goto out; 1520 offset += sizeof(struct direntry); 1521 uio_off = offset; 1522 if (cookies) { 1523 *cookies++ = offset; 1524 ncookies++; 1525 if (ncookies >= nc) 1526 goto out; 1527 } 1528 } 1529 } 1530 } 1531 1532 while (uio->uio_resid > 0) { 1533 lbn = de_cluster(pmp, offset - bias); 1534 on = (offset - bias) & pmp->pm_crbomask; 1535 n = MIN(pmp->pm_bpcluster - on, uio->uio_resid); 1536 diff = dep->de_FileSize - (offset - bias); 1537 if (diff <= 0) 1538 break; 1539 n = MIN(n, diff); 1540 if ((error = pcbmap(dep, lbn, &bn, &cn, &blsize)) != 0) 1541 break; 1542 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp); 1543 if (error) { 1544 brelse(bp); 1545 return (error); 1546 } 1547 n = MIN(n, blsize - bp->b_resid); 1548 1549 /* 1550 * Convert from dos directory entries to fs-independent 1551 * directory entries. 1552 */ 1553 for (dentp = (struct direntry *)(bp->b_data + on); 1554 (char *)dentp < bp->b_data + on + n; 1555 dentp++, offset += sizeof(struct direntry)) { 1556 #if 0 1557 1558 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n", 1559 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes); 1560 #endif 1561 /* 1562 * If this is an unused entry, we can stop. 1563 */ 1564 if (dentp->deName[0] == SLOT_EMPTY) { 1565 brelse(bp); 1566 goto out; 1567 } 1568 /* 1569 * Skip deleted entries. 1570 */ 1571 if (dentp->deName[0] == SLOT_DELETED) { 1572 chksum = -1; 1573 continue; 1574 } 1575 1576 /* 1577 * Handle Win95 long directory entries 1578 */ 1579 if (dentp->deAttributes == ATTR_WIN95) { 1580 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) 1581 continue; 1582 chksum = win2unixfn((struct winentry *)dentp, &dirbuf, chksum); 1583 continue; 1584 } 1585 1586 /* 1587 * Skip volume labels 1588 */ 1589 if (dentp->deAttributes & ATTR_VOLUME) { 1590 chksum = -1; 1591 continue; 1592 } 1593 /* 1594 * This computation of d_fileno must match 1595 * the computation of va_fileid in 1596 * msdosfs_getattr. 1597 */ 1598 if (dentp->deAttributes & ATTR_DIRECTORY) { 1599 fileno = getushort(dentp->deStartCluster); 1600 if (FAT32(pmp)) 1601 fileno |= getushort(dentp->deHighClust) << 16; 1602 /* if this is the root directory */ 1603 if (fileno == MSDOSFSROOT) 1604 if (FAT32(pmp)) 1605 fileno = cntobn(pmp, 1606 pmp->pm_rootdirblk) 1607 * dirsperblk; 1608 else 1609 fileno = 1; 1610 else 1611 fileno = cntobn(pmp, fileno) * dirsperblk; 1612 dirbuf.d_fileno = fileno; 1613 dirbuf.d_type = DT_DIR; 1614 } else { 1615 dirbuf.d_fileno = offset / sizeof(struct direntry); 1616 dirbuf.d_type = DT_REG; 1617 } 1618 if (chksum != winChksum(dentp->deName)) 1619 dirbuf.d_namlen = dos2unixfn(dentp->deName, 1620 (u_char *)dirbuf.d_name, 1621 pmp->pm_flags & MSDOSFSMNT_SHORTNAME); 1622 else 1623 dirbuf.d_name[dirbuf.d_namlen] = 0; 1624 chksum = -1; 1625 dirbuf.d_reclen = DIRENT_SIZE(&dirbuf); 1626 if (uio->uio_resid < dirbuf.d_reclen) { 1627 brelse(bp); 1628 goto out; 1629 } 1630 error = uiomove(&dirbuf, 1631 dirbuf.d_reclen, uio); 1632 if (error) { 1633 brelse(bp); 1634 goto out; 1635 } 1636 uio_off = offset + sizeof(struct direntry); 1637 if (cookies) { 1638 *cookies++ = offset + sizeof(struct direntry); 1639 ncookies++; 1640 if (ncookies >= nc) { 1641 brelse(bp); 1642 goto out; 1643 } 1644 } 1645 } 1646 brelse(bp); 1647 } 1648 1649 out: 1650 uio->uio_offset = uio_off; 1651 uio->uio_resid += lost; 1652 if (dep->de_FileSize - (offset - bias) <= 0) 1653 *ap->a_eofflag = 1; 1654 else 1655 *ap->a_eofflag = 0; 1656 1657 if (ap->a_ncookies) { 1658 if (error) { 1659 free(*ap->a_cookies, M_TEMP); 1660 *ap->a_ncookies = 0; 1661 *ap->a_cookies = NULL; 1662 } else 1663 *ap->a_ncookies = ncookies; 1664 } 1665 return (error); 1666 } 1667 1668 /* 1669 * DOS filesystems don't know what symlinks are. 1670 */ 1671 int 1672 msdosfs_readlink(v) 1673 void *v; 1674 { 1675 #if 0 1676 struct vop_readlink_args /* { 1677 struct vnode *a_vp; 1678 struct uio *a_uio; 1679 struct ucred *a_cred; 1680 } */ *ap; 1681 #endif 1682 1683 return (EINVAL); 1684 } 1685 1686 /* 1687 * vp - address of vnode file the file 1688 * bn - which cluster we are interested in mapping to a filesystem block number. 1689 * vpp - returns the vnode for the block special file holding the filesystem 1690 * containing the file of interest 1691 * bnp - address of where to return the filesystem relative block number 1692 */ 1693 int 1694 msdosfs_bmap(v) 1695 void *v; 1696 { 1697 struct vop_bmap_args /* { 1698 struct vnode *a_vp; 1699 daddr_t a_bn; 1700 struct vnode **a_vpp; 1701 daddr_t *a_bnp; 1702 int *a_runp; 1703 } */ *ap = v; 1704 struct denode *dep = VTODE(ap->a_vp); 1705 1706 if (ap->a_vpp != NULL) 1707 *ap->a_vpp = dep->de_devvp; 1708 if (ap->a_bnp == NULL) 1709 return (0); 1710 if (ap->a_runp) { 1711 /* 1712 * Sequential clusters should be counted here. 1713 */ 1714 *ap->a_runp = 0; 1715 } 1716 return (pcbmap(dep, ap->a_bn, ap->a_bnp, 0, 0)); 1717 } 1718 1719 int 1720 msdosfs_reallocblks(v) 1721 void *v; 1722 { 1723 #if 0 1724 struct vop_reallocblks_args /* { 1725 struct vnode *a_vp; 1726 struct cluster_save *a_buflist; 1727 } */ *ap = v; 1728 #endif 1729 1730 /* Currently no support for clustering */ /* XXX */ 1731 return (ENOSPC); 1732 } 1733 1734 int 1735 msdosfs_strategy(v) 1736 void *v; 1737 { 1738 struct vop_strategy_args /* { 1739 struct vnode *a_vp; 1740 struct buf *a_bp; 1741 } */ *ap = v; 1742 struct vnode *vp = ap->a_vp; 1743 struct buf *bp = ap->a_bp; 1744 struct denode *dep = VTODE(bp->b_vp); 1745 int error = 0; 1746 1747 if (vp->v_type == VBLK || vp->v_type == VCHR) 1748 panic("msdosfs_strategy: spec"); 1749 /* 1750 * If we don't already know the filesystem relative block number 1751 * then get it using pcbmap(). If pcbmap() returns the block 1752 * number as -1 then we've got a hole in the file. DOS filesystems 1753 * don't allow files with holes, so we shouldn't ever see this. 1754 */ 1755 if (bp->b_blkno == bp->b_lblkno) { 1756 error = pcbmap(dep, de_bn2cn(dep->de_pmp, bp->b_lblkno), 1757 &bp->b_blkno, 0, 0); 1758 if (error) 1759 bp->b_blkno = -1; 1760 if (bp->b_blkno == -1) 1761 clrbuf(bp); 1762 } 1763 if (bp->b_blkno == -1) { 1764 biodone(bp); 1765 return (error); 1766 } 1767 1768 /* 1769 * Read/write the block from/to the disk that contains the desired 1770 * file block. 1771 */ 1772 1773 vp = dep->de_devvp; 1774 return (VOP_STRATEGY(vp, bp)); 1775 } 1776 1777 int 1778 msdosfs_print(v) 1779 void *v; 1780 { 1781 struct vop_print_args /* { 1782 struct vnode *vp; 1783 } */ *ap = v; 1784 struct denode *dep = VTODE(ap->a_vp); 1785 1786 printf( 1787 "tag VT_MSDOSFS, startcluster %ld, dircluster %ld, diroffset %ld ", 1788 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset); 1789 printf(" dev %d, %d ", major(dep->de_dev), minor(dep->de_dev)); 1790 lockmgr_printinfo(&ap->a_vp->v_lock); 1791 printf("\n"); 1792 return (0); 1793 } 1794 1795 int 1796 msdosfs_advlock(v) 1797 void *v; 1798 { 1799 struct vop_advlock_args /* { 1800 struct vnode *a_vp; 1801 void *a_id; 1802 int a_op; 1803 struct flock *a_fl; 1804 int a_flags; 1805 } */ *ap = v; 1806 struct denode *dep = VTODE(ap->a_vp); 1807 1808 return lf_advlock(ap, &dep->de_lockf, dep->de_FileSize); 1809 } 1810 1811 int 1812 msdosfs_pathconf(v) 1813 void *v; 1814 { 1815 struct vop_pathconf_args /* { 1816 struct vnode *a_vp; 1817 int a_name; 1818 register_t *a_retval; 1819 } */ *ap = v; 1820 1821 switch (ap->a_name) { 1822 case _PC_LINK_MAX: 1823 *ap->a_retval = 1; 1824 return (0); 1825 case _PC_NAME_MAX: 1826 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_namemax; 1827 return (0); 1828 case _PC_PATH_MAX: 1829 *ap->a_retval = PATH_MAX; 1830 return (0); 1831 case _PC_CHOWN_RESTRICTED: 1832 *ap->a_retval = 1; 1833 return (0); 1834 case _PC_NO_TRUNC: 1835 *ap->a_retval = 0; 1836 return (0); 1837 case _PC_SYNC_IO: 1838 *ap->a_retval = 1; 1839 return (0); 1840 case _PC_FILESIZEBITS: 1841 *ap->a_retval = 32; 1842 return (0); 1843 default: 1844 return (EINVAL); 1845 } 1846 /* NOTREACHED */ 1847 } 1848 1849 /* Global vfs data structures for msdosfs */ 1850 int (**msdosfs_vnodeop_p) __P((void *)); 1851 const struct vnodeopv_entry_desc msdosfs_vnodeop_entries[] = { 1852 { &vop_default_desc, vn_default_error }, 1853 { &vop_lookup_desc, msdosfs_lookup }, /* lookup */ 1854 { &vop_create_desc, msdosfs_create }, /* create */ 1855 { &vop_mknod_desc, msdosfs_mknod }, /* mknod */ 1856 { &vop_open_desc, msdosfs_open }, /* open */ 1857 { &vop_close_desc, msdosfs_close }, /* close */ 1858 { &vop_access_desc, msdosfs_access }, /* access */ 1859 { &vop_getattr_desc, msdosfs_getattr }, /* getattr */ 1860 { &vop_setattr_desc, msdosfs_setattr }, /* setattr */ 1861 { &vop_read_desc, msdosfs_read }, /* read */ 1862 { &vop_write_desc, msdosfs_write }, /* write */ 1863 { &vop_lease_desc, msdosfs_lease_check }, /* lease */ 1864 { &vop_fcntl_desc, genfs_fcntl }, /* fcntl */ 1865 { &vop_ioctl_desc, msdosfs_ioctl }, /* ioctl */ 1866 { &vop_poll_desc, msdosfs_poll }, /* poll */ 1867 { &vop_kqfilter_desc, genfs_kqfilter }, /* kqfilter */ 1868 { &vop_revoke_desc, msdosfs_revoke }, /* revoke */ 1869 { &vop_mmap_desc, msdosfs_mmap }, /* mmap */ 1870 { &vop_fsync_desc, msdosfs_fsync }, /* fsync */ 1871 { &vop_seek_desc, msdosfs_seek }, /* seek */ 1872 { &vop_remove_desc, msdosfs_remove }, /* remove */ 1873 { &vop_link_desc, msdosfs_link }, /* link */ 1874 { &vop_rename_desc, msdosfs_rename }, /* rename */ 1875 { &vop_mkdir_desc, msdosfs_mkdir }, /* mkdir */ 1876 { &vop_rmdir_desc, msdosfs_rmdir }, /* rmdir */ 1877 { &vop_symlink_desc, msdosfs_symlink }, /* symlink */ 1878 { &vop_readdir_desc, msdosfs_readdir }, /* readdir */ 1879 { &vop_readlink_desc, msdosfs_readlink }, /* readlink */ 1880 { &vop_abortop_desc, msdosfs_abortop }, /* abortop */ 1881 { &vop_inactive_desc, msdosfs_inactive }, /* inactive */ 1882 { &vop_reclaim_desc, msdosfs_reclaim }, /* reclaim */ 1883 { &vop_lock_desc, genfs_lock }, /* lock */ 1884 { &vop_unlock_desc, genfs_unlock }, /* unlock */ 1885 { &vop_bmap_desc, msdosfs_bmap }, /* bmap */ 1886 { &vop_strategy_desc, msdosfs_strategy }, /* strategy */ 1887 { &vop_print_desc, msdosfs_print }, /* print */ 1888 { &vop_islocked_desc, genfs_islocked }, /* islocked */ 1889 { &vop_pathconf_desc, msdosfs_pathconf }, /* pathconf */ 1890 { &vop_advlock_desc, msdosfs_advlock }, /* advlock */ 1891 { &vop_reallocblks_desc, msdosfs_reallocblks }, /* reallocblks */ 1892 { &vop_update_desc, msdosfs_update }, /* update */ 1893 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 1894 { &vop_getpages_desc, genfs_getpages }, /* getpages */ 1895 { &vop_putpages_desc, genfs_putpages }, /* putpages */ 1896 { NULL, NULL } 1897 }; 1898 const struct vnodeopv_desc msdosfs_vnodeop_opv_desc = 1899 { &msdosfs_vnodeop_p, msdosfs_vnodeop_entries }; 1900