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sys/fs/msdosfs/msdosfs_vnops.c
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1 /* $NetBSD: msdosfs_vnops.c,v 1.9.2.1 2005/09/06 16:11:14 riz 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 1.9.2.1 2005/09/06 16:11:14 riz 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 /* Don't bother to try to write files larger than the fs limit */ 600 if (uio->uio_offset + uio->uio_resid > MSDOSFS_FILESIZE_MAX) 601 return (EFBIG); 602 603 /* 604 * If they've exceeded their filesize limit, tell them about it. 605 */ 606 if (p && 607 ((uio->uio_offset + uio->uio_resid) > 608 p->p_rlimit[RLIMIT_FSIZE].rlim_cur)) { 609 psignal(p, SIGXFSZ); 610 return (EFBIG); 611 } 612 613 /* 614 * If the offset we are starting the write at is beyond the end of 615 * the file, then they've done a seek. Unix filesystems allow 616 * files with holes in them, DOS doesn't so we must fill the hole 617 * with zeroed blocks. 618 */ 619 if (uio->uio_offset > dep->de_FileSize) { 620 if ((error = deextend(dep, uio->uio_offset, cred)) != 0) 621 return (error); 622 } 623 624 /* 625 * Remember some values in case the write fails. 626 */ 627 async = vp->v_mount->mnt_flag & MNT_ASYNC; 628 resid = uio->uio_resid; 629 osize = dep->de_FileSize; 630 631 /* 632 * If we write beyond the end of the file, extend it to its ultimate 633 * size ahead of the time to hopefully get a contiguous area. 634 */ 635 if (uio->uio_offset + resid > osize) { 636 count = de_clcount(pmp, uio->uio_offset + resid) - 637 de_clcount(pmp, osize); 638 if ((error = extendfile(dep, count, NULL, NULL, 0)) && 639 (error != ENOSPC || (ioflag & IO_UNIT))) 640 goto errexit; 641 } 642 643 if (dep->de_FileSize < uio->uio_offset + resid) { 644 dep->de_FileSize = uio->uio_offset + resid; 645 uvm_vnp_setsize(vp, dep->de_FileSize); 646 extended = 1; 647 } 648 649 do { 650 oldoff = uio->uio_offset; 651 bytelen = uio->uio_resid; 652 653 win = ubc_alloc(&vp->v_uobj, oldoff, &bytelen, UBC_WRITE); 654 error = uiomove(win, bytelen, uio); 655 ubc_release(win, 0); 656 if (error) { 657 break; 658 } 659 660 /* 661 * flush what we just wrote if necessary. 662 * XXXUBC simplistic async flushing. 663 */ 664 665 if (!async && oldoff >> 16 != uio->uio_offset >> 16) { 666 simple_lock(&vp->v_interlock); 667 error = VOP_PUTPAGES(vp, (oldoff >> 16) << 16, 668 (uio->uio_offset >> 16) << 16, PGO_CLEANIT); 669 } 670 } while (error == 0 && uio->uio_resid > 0); 671 if (error == 0 && ioflag & IO_SYNC) { 672 simple_lock(&vp->v_interlock); 673 error = VOP_PUTPAGES(vp, trunc_page(oldoff), 674 round_page(oldoff + bytelen), PGO_CLEANIT | PGO_SYNCIO); 675 } 676 dep->de_flag |= DE_UPDATE; 677 678 /* 679 * If the write failed and they want us to, truncate the file back 680 * to the size it was before the write was attempted. 681 */ 682 errexit: 683 if (resid > uio->uio_resid) 684 VN_KNOTE(vp, NOTE_WRITE | (extended ? NOTE_EXTEND : 0)); 685 if (error) { 686 detrunc(dep, osize, ioflag & IO_SYNC, NOCRED, NULL); 687 uio->uio_offset -= resid - uio->uio_resid; 688 uio->uio_resid = resid; 689 } else if ((ioflag & IO_SYNC) == IO_SYNC) 690 error = deupdat(dep, 1); 691 KASSERT(vp->v_size == dep->de_FileSize); 692 return (error); 693 } 694 695 int 696 msdosfs_update(v) 697 void *v; 698 { 699 struct vop_update_args /* { 700 struct vnode *a_vp; 701 struct timespec *a_access; 702 struct timespec *a_modify; 703 int a_flags; 704 } */ *ap = v; 705 struct buf *bp; 706 struct direntry *dirp; 707 struct denode *dep; 708 int error; 709 struct timespec ts; 710 711 if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY) 712 return (0); 713 dep = VTODE(ap->a_vp); 714 TIMEVAL_TO_TIMESPEC(&time, &ts); 715 DETIMES(dep, 716 ap->a_access ? ap->a_access : &ts, 717 ap->a_modify ? ap->a_modify : &ts, &ts, dep->de_pmp->pm_gmtoff); 718 if ((dep->de_flag & DE_MODIFIED) == 0) 719 return (0); 720 dep->de_flag &= ~DE_MODIFIED; 721 if (dep->de_Attributes & ATTR_DIRECTORY) 722 return (0); 723 if (dep->de_refcnt <= 0) 724 return (0); 725 error = readde(dep, &bp, &dirp); 726 if (error) 727 return (error); 728 DE_EXTERNALIZE(dirp, dep); 729 if (ap->a_flags & (UPDATE_WAIT|UPDATE_DIROP)) 730 return (bwrite(bp)); 731 else { 732 bdwrite(bp); 733 return (0); 734 } 735 } 736 737 /* 738 * Flush the blocks of a file to disk. 739 * 740 * This function is worthless for vnodes that represent directories. Maybe we 741 * could just do a sync if they try an fsync on a directory file. 742 */ 743 int 744 msdosfs_remove(v) 745 void *v; 746 { 747 struct vop_remove_args /* { 748 struct vnode *a_dvp; 749 struct vnode *a_vp; 750 struct componentname *a_cnp; 751 } */ *ap = v; 752 struct denode *dep = VTODE(ap->a_vp); 753 struct denode *ddep = VTODE(ap->a_dvp); 754 int error; 755 756 if (ap->a_vp->v_type == VDIR) 757 error = EPERM; 758 else 759 error = removede(ddep, dep); 760 #ifdef MSDOSFS_DEBUG 761 printf("msdosfs_remove(), dep %p, v_usecount %d\n", 762 dep, ap->a_vp->v_usecount); 763 #endif 764 VN_KNOTE(ap->a_vp, NOTE_DELETE); 765 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 766 if (ddep == dep) 767 vrele(ap->a_vp); 768 else 769 vput(ap->a_vp); /* causes msdosfs_inactive() to be called 770 * via vrele() */ 771 vput(ap->a_dvp); 772 return (error); 773 } 774 775 /* 776 * DOS filesystems don't know what links are. But since we already called 777 * msdosfs_lookup() with create and lockparent, the parent is locked so we 778 * have to free it before we return the error. 779 */ 780 int 781 msdosfs_link(v) 782 void *v; 783 { 784 struct vop_link_args /* { 785 struct vnode *a_dvp; 786 struct vnode *a_vp; 787 struct componentname *a_cnp; 788 } */ *ap = v; 789 790 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 791 vput(ap->a_dvp); 792 return (EOPNOTSUPP); 793 } 794 795 /* 796 * Renames on files require moving the denode to a new hash queue since the 797 * denode's location is used to compute which hash queue to put the file 798 * in. Unless it is a rename in place. For example "mv a b". 799 * 800 * What follows is the basic algorithm: 801 * 802 * if (file move) { 803 * if (dest file exists) { 804 * remove dest file 805 * } 806 * if (dest and src in same directory) { 807 * rewrite name in existing directory slot 808 * } else { 809 * write new entry in dest directory 810 * update offset and dirclust in denode 811 * move denode to new hash chain 812 * clear old directory entry 813 * } 814 * } else { 815 * directory move 816 * if (dest directory exists) { 817 * if (dest is not empty) { 818 * return ENOTEMPTY 819 * } 820 * remove dest directory 821 * } 822 * if (dest and src in same directory) { 823 * rewrite name in existing entry 824 * } else { 825 * be sure dest is not a child of src directory 826 * write entry in dest directory 827 * update "." and ".." in moved directory 828 * update offset and dirclust in denode 829 * move denode to new hash chain 830 * clear old directory entry for moved directory 831 * } 832 * } 833 * 834 * On entry: 835 * source's parent directory is unlocked 836 * source file or directory is unlocked 837 * destination's parent directory is locked 838 * destination file or directory is locked if it exists 839 * 840 * On exit: 841 * all denodes should be released 842 * 843 * Notes: 844 * I'm not sure how the memory containing the pathnames pointed at by the 845 * componentname structures is freed, there may be some memory bleeding 846 * for each rename done. 847 */ 848 int 849 msdosfs_rename(v) 850 void *v; 851 { 852 struct vop_rename_args /* { 853 struct vnode *a_fdvp; 854 struct vnode *a_fvp; 855 struct componentname *a_fcnp; 856 struct vnode *a_tdvp; 857 struct vnode *a_tvp; 858 struct componentname *a_tcnp; 859 } */ *ap = v; 860 struct vnode *tvp = ap->a_tvp; 861 struct vnode *tdvp = ap->a_tdvp; 862 struct vnode *fvp = ap->a_fvp; 863 struct vnode *fdvp = ap->a_fdvp; 864 struct componentname *tcnp = ap->a_tcnp; 865 struct componentname *fcnp = ap->a_fcnp; 866 struct proc *p = tcnp->cn_proc; 867 struct denode *ip, *xp, *dp, *zp; 868 u_char toname[11], oldname[11]; 869 u_long from_diroffset, to_diroffset; 870 u_char to_count; 871 int doingdirectory = 0, newparent = 0; 872 int error; 873 u_long cn; 874 daddr_t bn; 875 struct msdosfsmount *pmp; 876 struct direntry *dotdotp; 877 struct buf *bp; 878 int fdvp_dorele = 0; 879 880 pmp = VFSTOMSDOSFS(fdvp->v_mount); 881 882 #ifdef DIAGNOSTIC 883 if ((tcnp->cn_flags & HASBUF) == 0 || 884 (fcnp->cn_flags & HASBUF) == 0) 885 panic("msdosfs_rename: no name"); 886 #endif 887 /* 888 * Check for cross-device rename. 889 */ 890 if ((fvp->v_mount != tdvp->v_mount) || 891 (tvp && (fvp->v_mount != tvp->v_mount))) { 892 error = EXDEV; 893 abortit: 894 VOP_ABORTOP(tdvp, tcnp); 895 if (tdvp == tvp) 896 vrele(tdvp); 897 else 898 vput(tdvp); 899 if (tvp) 900 vput(tvp); 901 VOP_ABORTOP(fdvp, fcnp); 902 vrele(fdvp); 903 vrele(fvp); 904 return (error); 905 } 906 907 /* 908 * If source and dest are the same, do nothing. 909 */ 910 if (tvp == fvp) { 911 error = 0; 912 goto abortit; 913 } 914 915 /* */ 916 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0) 917 goto abortit; 918 dp = VTODE(fdvp); 919 ip = VTODE(fvp); 920 921 /* 922 * Be sure we are not renaming ".", "..", or an alias of ".". This 923 * leads to a crippled directory tree. It's pretty tough to do a 924 * "ls" or "pwd" with the "." directory entry missing, and "cd .." 925 * doesn't work if the ".." entry is missing. 926 */ 927 if (ip->de_Attributes & ATTR_DIRECTORY) { 928 /* 929 * Avoid ".", "..", and aliases of "." for obvious reasons. 930 */ 931 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 932 dp == ip || 933 (fcnp->cn_flags & ISDOTDOT) || 934 (tcnp->cn_flags & ISDOTDOT) || 935 (ip->de_flag & DE_RENAME)) { 936 VOP_UNLOCK(fvp, 0); 937 error = EINVAL; 938 goto abortit; 939 } 940 ip->de_flag |= DE_RENAME; 941 doingdirectory++; 942 } 943 VN_KNOTE(fdvp, NOTE_WRITE); /* XXXLUKEM/XXX: right place? */ 944 945 /* 946 * When the target exists, both the directory 947 * and target vnodes are returned locked. 948 */ 949 dp = VTODE(tdvp); 950 xp = tvp ? VTODE(tvp) : NULL; 951 /* 952 * Remember direntry place to use for destination 953 */ 954 to_diroffset = dp->de_fndoffset; 955 to_count = dp->de_fndcnt; 956 957 /* 958 * If ".." must be changed (ie the directory gets a new 959 * parent) then the source directory must not be in the 960 * directory hierarchy above the target, as this would 961 * orphan everything below the source directory. Also 962 * the user must have write permission in the source so 963 * as to be able to change "..". We must repeat the call 964 * to namei, as the parent directory is unlocked by the 965 * call to doscheckpath(). 966 */ 967 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, p); 968 VOP_UNLOCK(fvp, 0); 969 if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster) 970 newparent = 1; 971 vrele(fdvp); 972 if (doingdirectory && newparent) { 973 if (error) /* write access check above */ 974 goto bad; 975 if (xp != NULL) 976 vput(tvp); 977 /* 978 * doscheckpath() vput()'s dp, 979 * so we have to do a relookup afterwards 980 */ 981 if ((error = doscheckpath(ip, dp)) != 0) 982 goto out; 983 if ((tcnp->cn_flags & SAVESTART) == 0) 984 panic("msdosfs_rename: lost to startdir"); 985 if ((error = relookup(tdvp, &tvp, tcnp)) != 0) 986 goto out; 987 dp = VTODE(tdvp); 988 xp = tvp ? VTODE(tvp) : NULL; 989 } 990 991 if (xp != NULL) { 992 /* 993 * Target must be empty if a directory and have no links 994 * to it. Also, ensure source and target are compatible 995 * (both directories, or both not directories). 996 */ 997 if (xp->de_Attributes & ATTR_DIRECTORY) { 998 if (!dosdirempty(xp)) { 999 error = ENOTEMPTY; 1000 goto bad; 1001 } 1002 if (!doingdirectory) { 1003 error = ENOTDIR; 1004 goto bad; 1005 } 1006 } else if (doingdirectory) { 1007 error = EISDIR; 1008 goto bad; 1009 } 1010 if ((error = removede(dp, xp)) != 0) 1011 goto bad; 1012 VN_KNOTE(tdvp, NOTE_WRITE); 1013 VN_KNOTE(tvp, NOTE_DELETE); 1014 cache_purge(tvp); 1015 vput(tvp); 1016 xp = NULL; 1017 } 1018 1019 /* 1020 * Convert the filename in tcnp into a dos filename. We copy this 1021 * into the denode and directory entry for the destination 1022 * file/directory. 1023 */ 1024 if ((error = uniqdosname(VTODE(tdvp), tcnp, toname)) != 0) 1025 goto abortit; 1026 1027 /* 1028 * Since from wasn't locked at various places above, 1029 * have to do a relookup here. 1030 */ 1031 fcnp->cn_flags &= ~MODMASK; 1032 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 1033 if ((fcnp->cn_flags & SAVESTART) == 0) 1034 panic("msdosfs_rename: lost from startdir"); 1035 if (!newparent) 1036 VOP_UNLOCK(tdvp, 0); 1037 (void) relookup(fdvp, &fvp, fcnp); 1038 if (fvp == NULL) { 1039 /* 1040 * From name has disappeared. 1041 */ 1042 if (doingdirectory) 1043 panic("rename: lost dir entry"); 1044 vrele(ap->a_fvp); 1045 if (newparent) 1046 VOP_UNLOCK(tdvp, 0); 1047 vrele(tdvp); 1048 return 0; 1049 } 1050 fdvp_dorele = 1; 1051 xp = VTODE(fvp); 1052 zp = VTODE(fdvp); 1053 from_diroffset = zp->de_fndoffset; 1054 1055 /* 1056 * Ensure that the directory entry still exists and has not 1057 * changed till now. If the source is a file the entry may 1058 * have been unlinked or renamed. In either case there is 1059 * no further work to be done. If the source is a directory 1060 * then it cannot have been rmdir'ed or renamed; this is 1061 * prohibited by the DE_RENAME flag. 1062 */ 1063 if (xp != ip) { 1064 if (doingdirectory) 1065 panic("rename: lost dir entry"); 1066 vrele(ap->a_fvp); 1067 VOP_UNLOCK(fvp, 0); 1068 if (newparent) 1069 VOP_UNLOCK(fdvp, 0); 1070 xp = NULL; 1071 } else { 1072 vrele(fvp); 1073 xp = NULL; 1074 1075 /* 1076 * First write a new entry in the destination 1077 * directory and mark the entry in the source directory 1078 * as deleted. Then move the denode to the correct hash 1079 * chain for its new location in the filesystem. And, if 1080 * we moved a directory, then update its .. entry to point 1081 * to the new parent directory. 1082 */ 1083 memcpy(oldname, ip->de_Name, 11); 1084 memcpy(ip->de_Name, toname, 11); /* update denode */ 1085 dp->de_fndoffset = to_diroffset; 1086 dp->de_fndcnt = to_count; 1087 error = createde(ip, dp, (struct denode **)0, tcnp); 1088 if (error) { 1089 memcpy(ip->de_Name, oldname, 11); 1090 if (newparent) 1091 VOP_UNLOCK(fdvp, 0); 1092 VOP_UNLOCK(fvp, 0); 1093 goto bad; 1094 } 1095 ip->de_refcnt++; 1096 zp->de_fndoffset = from_diroffset; 1097 if ((error = removede(zp, ip)) != 0) { 1098 /* XXX should really panic here, fs is corrupt */ 1099 if (newparent) 1100 VOP_UNLOCK(fdvp, 0); 1101 VOP_UNLOCK(fvp, 0); 1102 goto bad; 1103 } 1104 cache_purge(fvp); 1105 if (!doingdirectory) { 1106 error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0, 1107 &ip->de_dirclust, 0); 1108 if (error) { 1109 /* XXX should really panic here, fs is corrupt */ 1110 if (newparent) 1111 VOP_UNLOCK(fdvp, 0); 1112 VOP_UNLOCK(fvp, 0); 1113 goto bad; 1114 } 1115 ip->de_diroffset = to_diroffset; 1116 if (ip->de_dirclust != MSDOSFSROOT) 1117 ip->de_diroffset &= pmp->pm_crbomask; 1118 } 1119 reinsert(ip); 1120 if (newparent) 1121 VOP_UNLOCK(fdvp, 0); 1122 } 1123 1124 /* 1125 * If we moved a directory to a new parent directory, then we must 1126 * fixup the ".." entry in the moved directory. 1127 */ 1128 if (doingdirectory && newparent) { 1129 cn = ip->de_StartCluster; 1130 if (cn == MSDOSFSROOT) { 1131 /* this should never happen */ 1132 panic("msdosfs_rename: updating .. in root directory?"); 1133 } else 1134 bn = cntobn(pmp, cn); 1135 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, 1136 NOCRED, &bp); 1137 if (error) { 1138 /* XXX should really panic here, fs is corrupt */ 1139 brelse(bp); 1140 VOP_UNLOCK(fvp, 0); 1141 goto bad; 1142 } 1143 dotdotp = (struct direntry *)bp->b_data + 1; 1144 putushort(dotdotp->deStartCluster, dp->de_StartCluster); 1145 if (FAT32(pmp)) { 1146 putushort(dotdotp->deHighClust, 1147 dp->de_StartCluster >> 16); 1148 } 1149 if ((error = bwrite(bp)) != 0) { 1150 /* XXX should really panic here, fs is corrupt */ 1151 VOP_UNLOCK(fvp, 0); 1152 goto bad; 1153 } 1154 } 1155 1156 VN_KNOTE(fvp, NOTE_RENAME); 1157 VOP_UNLOCK(fvp, 0); 1158 bad: 1159 if (xp) 1160 vput(tvp); 1161 vput(tdvp); 1162 out: 1163 ip->de_flag &= ~DE_RENAME; 1164 if (fdvp_dorele) 1165 vrele(fdvp); 1166 vrele(fvp); 1167 return (error); 1168 1169 } 1170 1171 static const struct { 1172 struct direntry dot; 1173 struct direntry dotdot; 1174 } dosdirtemplate = { 1175 { ". ", " ", /* the . entry */ 1176 ATTR_DIRECTORY, /* file attribute */ 1177 0, /* reserved */ 1178 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1179 { 0, 0 }, /* access date */ 1180 { 0, 0 }, /* high bits of start cluster */ 1181 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1182 { 0, 0 }, /* startcluster */ 1183 { 0, 0, 0, 0 } /* filesize */ 1184 }, 1185 { ".. ", " ", /* the .. entry */ 1186 ATTR_DIRECTORY, /* file attribute */ 1187 0, /* reserved */ 1188 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1189 { 0, 0 }, /* access date */ 1190 { 0, 0 }, /* high bits of start cluster */ 1191 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1192 { 0, 0 }, /* startcluster */ 1193 { 0, 0, 0, 0 } /* filesize */ 1194 } 1195 }; 1196 1197 int 1198 msdosfs_mkdir(v) 1199 void *v; 1200 { 1201 struct vop_mkdir_args /* { 1202 struct vnode *a_dvp; 1203 struvt vnode **a_vpp; 1204 struvt componentname *a_cnp; 1205 struct vattr *a_vap; 1206 } */ *ap = v; 1207 struct componentname *cnp = ap->a_cnp; 1208 struct denode ndirent; 1209 struct denode *dep; 1210 struct denode *pdep = VTODE(ap->a_dvp); 1211 int error; 1212 int bn; 1213 u_long newcluster, pcl; 1214 struct direntry *denp; 1215 struct msdosfsmount *pmp = pdep->de_pmp; 1216 struct buf *bp; 1217 struct timespec ts; 1218 int async = pdep->de_pmp->pm_mountp->mnt_flag & MNT_ASYNC; 1219 1220 /* 1221 * If this is the root directory and there is no space left we 1222 * can't do anything. This is because the root directory can not 1223 * change size. 1224 */ 1225 if (pdep->de_StartCluster == MSDOSFSROOT 1226 && pdep->de_fndoffset >= pdep->de_FileSize) { 1227 error = ENOSPC; 1228 goto bad2; 1229 } 1230 1231 /* 1232 * Allocate a cluster to hold the about to be created directory. 1233 */ 1234 error = clusteralloc(pmp, 0, 1, &newcluster, NULL); 1235 if (error) 1236 goto bad2; 1237 1238 memset(&ndirent, 0, sizeof(ndirent)); 1239 ndirent.de_pmp = pmp; 1240 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 1241 TIMEVAL_TO_TIMESPEC(&time, &ts); 1242 DETIMES(&ndirent, &ts, &ts, &ts, pmp->pm_gmtoff); 1243 1244 /* 1245 * Now fill the cluster with the "." and ".." entries. And write 1246 * the cluster to disk. This way it is there for the parent 1247 * directory to be pointing at if there were a crash. 1248 */ 1249 bn = cntobn(pmp, newcluster); 1250 /* always succeeds */ 1251 bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0); 1252 memset(bp->b_data, 0, pmp->pm_bpcluster); 1253 memcpy(bp->b_data, &dosdirtemplate, sizeof dosdirtemplate); 1254 denp = (struct direntry *)bp->b_data; 1255 putushort(denp[0].deStartCluster, newcluster); 1256 putushort(denp[0].deCDate, ndirent.de_CDate); 1257 putushort(denp[0].deCTime, ndirent.de_CTime); 1258 denp[0].deCHundredth = ndirent.de_CHun; 1259 putushort(denp[0].deADate, ndirent.de_ADate); 1260 putushort(denp[0].deMDate, ndirent.de_MDate); 1261 putushort(denp[0].deMTime, ndirent.de_MTime); 1262 pcl = pdep->de_StartCluster; 1263 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1264 pcl = 0; 1265 putushort(denp[1].deStartCluster, pcl); 1266 putushort(denp[1].deCDate, ndirent.de_CDate); 1267 putushort(denp[1].deCTime, ndirent.de_CTime); 1268 denp[1].deCHundredth = ndirent.de_CHun; 1269 putushort(denp[1].deADate, ndirent.de_ADate); 1270 putushort(denp[1].deMDate, ndirent.de_MDate); 1271 putushort(denp[1].deMTime, ndirent.de_MTime); 1272 if (FAT32(pmp)) { 1273 putushort(denp[0].deHighClust, newcluster >> 16); 1274 putushort(denp[1].deHighClust, pdep->de_StartCluster >> 16); 1275 } 1276 1277 if (async) 1278 bdwrite(bp); 1279 else if ((error = bwrite(bp)) != 0) 1280 goto bad; 1281 1282 /* 1283 * Now build up a directory entry pointing to the newly allocated 1284 * cluster. This will be written to an empty slot in the parent 1285 * directory. 1286 */ 1287 #ifdef DIAGNOSTIC 1288 if ((cnp->cn_flags & HASBUF) == 0) 1289 panic("msdosfs_mkdir: no name"); 1290 #endif 1291 if ((error = uniqdosname(pdep, cnp, ndirent.de_Name)) != 0) 1292 goto bad; 1293 1294 ndirent.de_Attributes = ATTR_DIRECTORY; 1295 ndirent.de_StartCluster = newcluster; 1296 ndirent.de_FileSize = 0; 1297 ndirent.de_dev = pdep->de_dev; 1298 ndirent.de_devvp = pdep->de_devvp; 1299 if ((error = createde(&ndirent, pdep, &dep, cnp)) != 0) 1300 goto bad; 1301 if ((cnp->cn_flags & SAVESTART) == 0) 1302 PNBUF_PUT(cnp->cn_pnbuf); 1303 VN_KNOTE(ap->a_dvp, NOTE_WRITE | NOTE_LINK); 1304 vput(ap->a_dvp); 1305 *ap->a_vpp = DETOV(dep); 1306 return (0); 1307 1308 bad: 1309 clusterfree(pmp, newcluster, NULL); 1310 bad2: 1311 PNBUF_PUT(cnp->cn_pnbuf); 1312 vput(ap->a_dvp); 1313 return (error); 1314 } 1315 1316 int 1317 msdosfs_rmdir(v) 1318 void *v; 1319 { 1320 struct vop_rmdir_args /* { 1321 struct vnode *a_dvp; 1322 struct vnode *a_vp; 1323 struct componentname *a_cnp; 1324 } */ *ap = v; 1325 struct vnode *vp = ap->a_vp; 1326 struct vnode *dvp = ap->a_dvp; 1327 struct componentname *cnp = ap->a_cnp; 1328 struct denode *ip, *dp; 1329 int error; 1330 1331 ip = VTODE(vp); 1332 dp = VTODE(dvp); 1333 /* 1334 * No rmdir "." please. 1335 */ 1336 if (dp == ip) { 1337 vrele(dvp); 1338 vput(vp); 1339 return (EINVAL); 1340 } 1341 /* 1342 * Verify the directory is empty (and valid). 1343 * (Rmdir ".." won't be valid since 1344 * ".." will contain a reference to 1345 * the current directory and thus be 1346 * non-empty.) 1347 */ 1348 error = 0; 1349 if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) { 1350 error = ENOTEMPTY; 1351 goto out; 1352 } 1353 /* 1354 * Delete the entry from the directory. For dos filesystems this 1355 * gets rid of the directory entry on disk, the in memory copy 1356 * still exists but the de_refcnt is <= 0. This prevents it from 1357 * being found by deget(). When the vput() on dep is done we give 1358 * up access and eventually msdosfs_reclaim() will be called which 1359 * will remove it from the denode cache. 1360 */ 1361 if ((error = removede(dp, ip)) != 0) 1362 goto out; 1363 /* 1364 * This is where we decrement the link count in the parent 1365 * directory. Since dos filesystems don't do this we just purge 1366 * the name cache and let go of the parent directory denode. 1367 */ 1368 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 1369 cache_purge(dvp); 1370 vput(dvp); 1371 dvp = NULL; 1372 /* 1373 * Truncate the directory that is being deleted. 1374 */ 1375 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred, cnp->cn_proc); 1376 cache_purge(vp); 1377 out: 1378 VN_KNOTE(vp, NOTE_DELETE); 1379 if (dvp) 1380 vput(dvp); 1381 vput(vp); 1382 return (error); 1383 } 1384 1385 /* 1386 * DOS filesystems don't know what symlinks are. 1387 */ 1388 int 1389 msdosfs_symlink(v) 1390 void *v; 1391 { 1392 struct vop_symlink_args /* { 1393 struct vnode *a_dvp; 1394 struct vnode **a_vpp; 1395 struct componentname *a_cnp; 1396 struct vattr *a_vap; 1397 char *a_target; 1398 } */ *ap = v; 1399 1400 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 1401 vput(ap->a_dvp); 1402 return (EOPNOTSUPP); 1403 } 1404 1405 int 1406 msdosfs_readdir(v) 1407 void *v; 1408 { 1409 struct vop_readdir_args /* { 1410 struct vnode *a_vp; 1411 struct uio *a_uio; 1412 struct ucred *a_cred; 1413 int *a_eofflag; 1414 off_t **a_cookies; 1415 int *a_ncookies; 1416 } */ *ap = v; 1417 int error = 0; 1418 int diff; 1419 long n; 1420 int blsize; 1421 long on; 1422 long lost; 1423 long count; 1424 u_long cn; 1425 u_long fileno; 1426 u_long dirsperblk; 1427 long bias = 0; 1428 daddr_t bn, lbn; 1429 struct buf *bp; 1430 struct denode *dep = VTODE(ap->a_vp); 1431 struct msdosfsmount *pmp = dep->de_pmp; 1432 struct direntry *dentp; 1433 struct dirent dirbuf; 1434 struct uio *uio = ap->a_uio; 1435 off_t *cookies = NULL; 1436 int ncookies = 0, nc = 0; 1437 off_t offset, uio_off; 1438 int chksum = -1; 1439 1440 #ifdef MSDOSFS_DEBUG 1441 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n", 1442 ap->a_vp, uio, ap->a_cred, ap->a_eofflag); 1443 #endif 1444 1445 /* 1446 * msdosfs_readdir() won't operate properly on regular files since 1447 * it does i/o only with the filesystem vnode, and hence can 1448 * retrieve the wrong block from the buffer cache for a plain file. 1449 * So, fail attempts to readdir() on a plain file. 1450 */ 1451 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) 1452 return (ENOTDIR); 1453 1454 /* 1455 * To be safe, initialize dirbuf 1456 */ 1457 memset(dirbuf.d_name, 0, sizeof(dirbuf.d_name)); 1458 1459 /* 1460 * If the user buffer is smaller than the size of one dos directory 1461 * entry or the file offset is not a multiple of the size of a 1462 * directory entry, then we fail the read. 1463 */ 1464 count = uio->uio_resid & ~(sizeof(struct direntry) - 1); 1465 offset = uio->uio_offset; 1466 if (count < sizeof(struct direntry) || 1467 (offset & (sizeof(struct direntry) - 1))) 1468 return (EINVAL); 1469 lost = uio->uio_resid - count; 1470 uio->uio_resid = count; 1471 uio_off = uio->uio_offset; 1472 1473 if (ap->a_ncookies) { 1474 nc = uio->uio_resid / 16; 1475 cookies = malloc(nc * sizeof (off_t), M_TEMP, M_WAITOK); 1476 *ap->a_cookies = cookies; 1477 } 1478 1479 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 1480 1481 /* 1482 * If they are reading from the root directory then, we simulate 1483 * the . and .. entries since these don't exist in the root 1484 * directory. We also set the offset bias to make up for having to 1485 * simulate these entries. By this I mean that at file offset 64 we 1486 * read the first entry in the root directory that lives on disk. 1487 */ 1488 if (dep->de_StartCluster == MSDOSFSROOT 1489 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) { 1490 #if 0 1491 printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n", 1492 offset); 1493 #endif 1494 bias = 2 * sizeof(struct direntry); 1495 if (offset < bias) { 1496 for (n = (int)offset / sizeof(struct direntry); 1497 n < 2; n++) { 1498 if (FAT32(pmp)) 1499 dirbuf.d_fileno = cntobn(pmp, 1500 pmp->pm_rootdirblk) 1501 * dirsperblk; 1502 else 1503 dirbuf.d_fileno = 1; 1504 dirbuf.d_type = DT_DIR; 1505 switch (n) { 1506 case 0: 1507 dirbuf.d_namlen = 1; 1508 strlcpy(dirbuf.d_name, ".", 1509 sizeof(dirbuf.d_name)); 1510 break; 1511 case 1: 1512 dirbuf.d_namlen = 2; 1513 strlcpy(dirbuf.d_name, "..", 1514 sizeof(dirbuf.d_name)); 1515 break; 1516 } 1517 dirbuf.d_reclen = DIRENT_SIZE(&dirbuf); 1518 if (uio->uio_resid < dirbuf.d_reclen) 1519 goto out; 1520 error = uiomove((caddr_t) &dirbuf, 1521 dirbuf.d_reclen, uio); 1522 if (error) 1523 goto out; 1524 offset += sizeof(struct direntry); 1525 uio_off = offset; 1526 if (cookies) { 1527 *cookies++ = offset; 1528 ncookies++; 1529 if (ncookies >= nc) 1530 goto out; 1531 } 1532 } 1533 } 1534 } 1535 1536 while (uio->uio_resid > 0) { 1537 lbn = de_cluster(pmp, offset - bias); 1538 on = (offset - bias) & pmp->pm_crbomask; 1539 n = MIN(pmp->pm_bpcluster - on, uio->uio_resid); 1540 diff = dep->de_FileSize - (offset - bias); 1541 if (diff <= 0) 1542 break; 1543 n = MIN(n, diff); 1544 if ((error = pcbmap(dep, lbn, &bn, &cn, &blsize)) != 0) 1545 break; 1546 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp); 1547 if (error) { 1548 brelse(bp); 1549 return (error); 1550 } 1551 n = MIN(n, blsize - bp->b_resid); 1552 1553 /* 1554 * Convert from dos directory entries to fs-independent 1555 * directory entries. 1556 */ 1557 for (dentp = (struct direntry *)(bp->b_data + on); 1558 (char *)dentp < bp->b_data + on + n; 1559 dentp++, offset += sizeof(struct direntry)) { 1560 #if 0 1561 1562 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n", 1563 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes); 1564 #endif 1565 /* 1566 * If this is an unused entry, we can stop. 1567 */ 1568 if (dentp->deName[0] == SLOT_EMPTY) { 1569 brelse(bp); 1570 goto out; 1571 } 1572 /* 1573 * Skip deleted entries. 1574 */ 1575 if (dentp->deName[0] == SLOT_DELETED) { 1576 chksum = -1; 1577 continue; 1578 } 1579 1580 /* 1581 * Handle Win95 long directory entries 1582 */ 1583 if (dentp->deAttributes == ATTR_WIN95) { 1584 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) 1585 continue; 1586 chksum = win2unixfn((struct winentry *)dentp, &dirbuf, chksum); 1587 continue; 1588 } 1589 1590 /* 1591 * Skip volume labels 1592 */ 1593 if (dentp->deAttributes & ATTR_VOLUME) { 1594 chksum = -1; 1595 continue; 1596 } 1597 /* 1598 * This computation of d_fileno must match 1599 * the computation of va_fileid in 1600 * msdosfs_getattr. 1601 */ 1602 if (dentp->deAttributes & ATTR_DIRECTORY) { 1603 fileno = getushort(dentp->deStartCluster); 1604 if (FAT32(pmp)) 1605 fileno |= getushort(dentp->deHighClust) << 16; 1606 /* if this is the root directory */ 1607 if (fileno == MSDOSFSROOT) 1608 if (FAT32(pmp)) 1609 fileno = cntobn(pmp, 1610 pmp->pm_rootdirblk) 1611 * dirsperblk; 1612 else 1613 fileno = 1; 1614 else 1615 fileno = cntobn(pmp, fileno) * dirsperblk; 1616 dirbuf.d_fileno = fileno; 1617 dirbuf.d_type = DT_DIR; 1618 } else { 1619 dirbuf.d_fileno = offset / sizeof(struct direntry); 1620 dirbuf.d_type = DT_REG; 1621 } 1622 if (chksum != winChksum(dentp->deName)) 1623 dirbuf.d_namlen = dos2unixfn(dentp->deName, 1624 (u_char *)dirbuf.d_name, 1625 pmp->pm_flags & MSDOSFSMNT_SHORTNAME); 1626 else 1627 dirbuf.d_name[dirbuf.d_namlen] = 0; 1628 chksum = -1; 1629 dirbuf.d_reclen = DIRENT_SIZE(&dirbuf); 1630 if (uio->uio_resid < dirbuf.d_reclen) { 1631 brelse(bp); 1632 goto out; 1633 } 1634 error = uiomove((caddr_t) &dirbuf, 1635 dirbuf.d_reclen, uio); 1636 if (error) { 1637 brelse(bp); 1638 goto out; 1639 } 1640 uio_off = offset + sizeof(struct direntry); 1641 if (cookies) { 1642 *cookies++ = offset + sizeof(struct direntry); 1643 ncookies++; 1644 if (ncookies >= nc) { 1645 brelse(bp); 1646 goto out; 1647 } 1648 } 1649 } 1650 brelse(bp); 1651 } 1652 1653 out: 1654 uio->uio_offset = uio_off; 1655 uio->uio_resid += lost; 1656 if (dep->de_FileSize - (offset - bias) <= 0) 1657 *ap->a_eofflag = 1; 1658 else 1659 *ap->a_eofflag = 0; 1660 1661 if (ap->a_ncookies) { 1662 if (error) { 1663 free(*ap->a_cookies, M_TEMP); 1664 *ap->a_ncookies = 0; 1665 *ap->a_cookies = NULL; 1666 } else 1667 *ap->a_ncookies = ncookies; 1668 } 1669 return (error); 1670 } 1671 1672 /* 1673 * DOS filesystems don't know what symlinks are. 1674 */ 1675 int 1676 msdosfs_readlink(v) 1677 void *v; 1678 { 1679 #if 0 1680 struct vop_readlink_args /* { 1681 struct vnode *a_vp; 1682 struct uio *a_uio; 1683 struct ucred *a_cred; 1684 } */ *ap; 1685 #endif 1686 1687 return (EINVAL); 1688 } 1689 1690 /* 1691 * vp - address of vnode file the file 1692 * bn - which cluster we are interested in mapping to a filesystem block number. 1693 * vpp - returns the vnode for the block special file holding the filesystem 1694 * containing the file of interest 1695 * bnp - address of where to return the filesystem relative block number 1696 */ 1697 int 1698 msdosfs_bmap(v) 1699 void *v; 1700 { 1701 struct vop_bmap_args /* { 1702 struct vnode *a_vp; 1703 daddr_t a_bn; 1704 struct vnode **a_vpp; 1705 daddr_t *a_bnp; 1706 int *a_runp; 1707 } */ *ap = v; 1708 struct denode *dep = VTODE(ap->a_vp); 1709 1710 if (ap->a_vpp != NULL) 1711 *ap->a_vpp = dep->de_devvp; 1712 if (ap->a_bnp == NULL) 1713 return (0); 1714 if (ap->a_runp) { 1715 /* 1716 * Sequential clusters should be counted here. 1717 */ 1718 *ap->a_runp = 0; 1719 } 1720 return (pcbmap(dep, ap->a_bn, ap->a_bnp, 0, 0)); 1721 } 1722 1723 int 1724 msdosfs_reallocblks(v) 1725 void *v; 1726 { 1727 #if 0 1728 struct vop_reallocblks_args /* { 1729 struct vnode *a_vp; 1730 struct cluster_save *a_buflist; 1731 } */ *ap = v; 1732 #endif 1733 1734 /* Currently no support for clustering */ /* XXX */ 1735 return (ENOSPC); 1736 } 1737 1738 int 1739 msdosfs_strategy(v) 1740 void *v; 1741 { 1742 struct vop_strategy_args /* { 1743 struct vnode *a_vp; 1744 struct buf *a_bp; 1745 } */ *ap = v; 1746 struct vnode *vp = ap->a_vp; 1747 struct buf *bp = ap->a_bp; 1748 struct denode *dep = VTODE(bp->b_vp); 1749 int error = 0; 1750 1751 if (vp->v_type == VBLK || vp->v_type == VCHR) 1752 panic("msdosfs_strategy: spec"); 1753 /* 1754 * If we don't already know the filesystem relative block number 1755 * then get it using pcbmap(). If pcbmap() returns the block 1756 * number as -1 then we've got a hole in the file. DOS filesystems 1757 * don't allow files with holes, so we shouldn't ever see this. 1758 */ 1759 if (bp->b_blkno == bp->b_lblkno) { 1760 error = pcbmap(dep, de_bn2cn(dep->de_pmp, bp->b_lblkno), 1761 &bp->b_blkno, 0, 0); 1762 if (error) 1763 bp->b_blkno = -1; 1764 if (bp->b_blkno == -1) 1765 clrbuf(bp); 1766 } 1767 if (bp->b_blkno == -1) { 1768 biodone(bp); 1769 return (error); 1770 } 1771 1772 /* 1773 * Read/write the block from/to the disk that contains the desired 1774 * file block. 1775 */ 1776 1777 vp = dep->de_devvp; 1778 return (VOP_STRATEGY(vp, bp)); 1779 } 1780 1781 int 1782 msdosfs_print(v) 1783 void *v; 1784 { 1785 struct vop_print_args /* { 1786 struct vnode *vp; 1787 } */ *ap = v; 1788 struct denode *dep = VTODE(ap->a_vp); 1789 1790 printf( 1791 "tag VT_MSDOSFS, startcluster %ld, dircluster %ld, diroffset %ld ", 1792 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset); 1793 printf(" dev %d, %d ", major(dep->de_dev), minor(dep->de_dev)); 1794 lockmgr_printinfo(&ap->a_vp->v_lock); 1795 printf("\n"); 1796 return (0); 1797 } 1798 1799 int 1800 msdosfs_advlock(v) 1801 void *v; 1802 { 1803 struct vop_advlock_args /* { 1804 struct vnode *a_vp; 1805 caddr_t a_id; 1806 int a_op; 1807 struct flock *a_fl; 1808 int a_flags; 1809 } */ *ap = v; 1810 struct denode *dep = VTODE(ap->a_vp); 1811 1812 return lf_advlock(ap, &dep->de_lockf, dep->de_FileSize); 1813 } 1814 1815 int 1816 msdosfs_pathconf(v) 1817 void *v; 1818 { 1819 struct vop_pathconf_args /* { 1820 struct vnode *a_vp; 1821 int a_name; 1822 register_t *a_retval; 1823 } */ *ap = v; 1824 struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp; 1825 1826 switch (ap->a_name) { 1827 case _PC_LINK_MAX: 1828 *ap->a_retval = 1; 1829 return (0); 1830 case _PC_NAME_MAX: 1831 *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12; 1832 return (0); 1833 case _PC_PATH_MAX: 1834 *ap->a_retval = PATH_MAX; 1835 return (0); 1836 case _PC_CHOWN_RESTRICTED: 1837 *ap->a_retval = 1; 1838 return (0); 1839 case _PC_NO_TRUNC: 1840 *ap->a_retval = 0; 1841 return (0); 1842 case _PC_SYNC_IO: 1843 *ap->a_retval = 1; 1844 return (0); 1845 case _PC_FILESIZEBITS: 1846 *ap->a_retval = 32; 1847 return (0); 1848 default: 1849 return (EINVAL); 1850 } 1851 /* NOTREACHED */ 1852 } 1853 1854 /* Global vfs data structures for msdosfs */ 1855 int (**msdosfs_vnodeop_p) __P((void *)); 1856 const struct vnodeopv_entry_desc msdosfs_vnodeop_entries[] = { 1857 { &vop_default_desc, vn_default_error }, 1858 { &vop_lookup_desc, msdosfs_lookup }, /* lookup */ 1859 { &vop_create_desc, msdosfs_create }, /* create */ 1860 { &vop_mknod_desc, msdosfs_mknod }, /* mknod */ 1861 { &vop_open_desc, msdosfs_open }, /* open */ 1862 { &vop_close_desc, msdosfs_close }, /* close */ 1863 { &vop_access_desc, msdosfs_access }, /* access */ 1864 { &vop_getattr_desc, msdosfs_getattr }, /* getattr */ 1865 { &vop_setattr_desc, msdosfs_setattr }, /* setattr */ 1866 { &vop_read_desc, msdosfs_read }, /* read */ 1867 { &vop_write_desc, msdosfs_write }, /* write */ 1868 { &vop_lease_desc, msdosfs_lease_check }, /* lease */ 1869 { &vop_fcntl_desc, genfs_fcntl }, /* fcntl */ 1870 { &vop_ioctl_desc, msdosfs_ioctl }, /* ioctl */ 1871 { &vop_poll_desc, msdosfs_poll }, /* poll */ 1872 { &vop_kqfilter_desc, genfs_kqfilter }, /* kqfilter */ 1873 { &vop_revoke_desc, msdosfs_revoke }, /* revoke */ 1874 { &vop_mmap_desc, msdosfs_mmap }, /* mmap */ 1875 { &vop_fsync_desc, msdosfs_fsync }, /* fsync */ 1876 { &vop_seek_desc, msdosfs_seek }, /* seek */ 1877 { &vop_remove_desc, msdosfs_remove }, /* remove */ 1878 { &vop_link_desc, msdosfs_link }, /* link */ 1879 { &vop_rename_desc, msdosfs_rename }, /* rename */ 1880 { &vop_mkdir_desc, msdosfs_mkdir }, /* mkdir */ 1881 { &vop_rmdir_desc, msdosfs_rmdir }, /* rmdir */ 1882 { &vop_symlink_desc, msdosfs_symlink }, /* symlink */ 1883 { &vop_readdir_desc, msdosfs_readdir }, /* readdir */ 1884 { &vop_readlink_desc, msdosfs_readlink }, /* readlink */ 1885 { &vop_abortop_desc, msdosfs_abortop }, /* abortop */ 1886 { &vop_inactive_desc, msdosfs_inactive }, /* inactive */ 1887 { &vop_reclaim_desc, msdosfs_reclaim }, /* reclaim */ 1888 { &vop_lock_desc, genfs_lock }, /* lock */ 1889 { &vop_unlock_desc, genfs_unlock }, /* unlock */ 1890 { &vop_bmap_desc, msdosfs_bmap }, /* bmap */ 1891 { &vop_strategy_desc, msdosfs_strategy }, /* strategy */ 1892 { &vop_print_desc, msdosfs_print }, /* print */ 1893 { &vop_islocked_desc, genfs_islocked }, /* islocked */ 1894 { &vop_pathconf_desc, msdosfs_pathconf }, /* pathconf */ 1895 { &vop_advlock_desc, msdosfs_advlock }, /* advlock */ 1896 { &vop_reallocblks_desc, msdosfs_reallocblks }, /* reallocblks */ 1897 { &vop_update_desc, msdosfs_update }, /* update */ 1898 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 1899 { &vop_getpages_desc, genfs_getpages }, /* getpages */ 1900 { &vop_putpages_desc, genfs_putpages }, /* putpages */ 1901 { NULL, NULL } 1902 }; 1903 const struct vnodeopv_desc msdosfs_vnodeop_opv_desc = 1904 { &msdosfs_vnodeop_p, msdosfs_vnodeop_entries };
Cache object: 69b7ce39aa385f9125a99a262c4268e6
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