| 1 | /* $NetBSD: msdosfs_lookup.c,v 1.35 2016/01/30 09:59:27 mlelstv 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 | #if HAVE_NBTOOL_CONFIG_H |
| 51 | #include "nbtool_config.h" |
| 52 | #endif |
| 53 | |
| 54 | #include <sys/cdefs.h> |
| 55 | __KERNEL_RCSID(0, "$NetBSD: msdosfs_lookup.c,v 1.35 2016/01/30 09:59:27 mlelstv Exp $" ); |
| 56 | |
| 57 | #include <sys/param.h> |
| 58 | |
| 59 | #ifdef _KERNEL |
| 60 | #include <sys/systm.h> |
| 61 | #include <sys/mount.h> |
| 62 | #include <sys/kauth.h> |
| 63 | #include <sys/namei.h> |
| 64 | #include <sys/dirent.h> |
| 65 | #include <sys/buf.h> |
| 66 | #include <sys/vnode.h> |
| 67 | #include <sys/atomic.h> |
| 68 | #else |
| 69 | #include <ffs/buf.h> |
| 70 | #endif /* _KERNEL */ |
| 71 | |
| 72 | #include <fs/msdosfs/bpb.h> |
| 73 | #include <fs/msdosfs/direntry.h> |
| 74 | #include <fs/msdosfs/denode.h> |
| 75 | #include <fs/msdosfs/msdosfsmount.h> |
| 76 | #include <fs/msdosfs/fat.h> |
| 77 | |
| 78 | |
| 79 | #ifdef _KERNEL |
| 80 | /* |
| 81 | * When we search a directory the blocks containing directory entries are |
| 82 | * read and examined. The directory entries contain information that would |
| 83 | * normally be in the inode of a unix filesystem. This means that some of |
| 84 | * a directory's contents may also be in memory resident denodes (sort of |
| 85 | * an inode). This can cause problems if we are searching while some other |
| 86 | * process is modifying a directory. To prevent one process from accessing |
| 87 | * incompletely modified directory information we depend upon being the |
| 88 | * sole owner of a directory block. bread/brelse provide this service. |
| 89 | * This being the case, when a process modifies a directory it must first |
| 90 | * acquire the disk block that contains the directory entry to be modified. |
| 91 | * Then update the disk block and the denode, and then write the disk block |
| 92 | * out to disk. This way disk blocks containing directory entries and in |
| 93 | * memory denode's will be in synch. |
| 94 | */ |
| 95 | int |
| 96 | msdosfs_lookup(void *v) |
| 97 | { |
| 98 | struct vop_lookup_v2_args /* { |
| 99 | struct vnode *a_dvp; |
| 100 | struct vnode **a_vpp; |
| 101 | struct componentname *a_cnp; |
| 102 | } */ *ap = v; |
| 103 | struct vnode *vdp = ap->a_dvp; |
| 104 | struct vnode **vpp = ap->a_vpp; |
| 105 | struct componentname *cnp = ap->a_cnp; |
| 106 | daddr_t bn; |
| 107 | int error; |
| 108 | int slotcount; |
| 109 | int slotoffset = 0; |
| 110 | int frcn; |
| 111 | u_long cluster; |
| 112 | int blkoff; |
| 113 | int diroff; |
| 114 | int blsize; |
| 115 | int isadir; /* ~0 if found direntry is a directory */ |
| 116 | u_long scn; /* starting cluster number */ |
| 117 | struct denode *dp; |
| 118 | struct msdosfsmount *pmp; |
| 119 | struct buf *bp = 0; |
| 120 | struct direntry *dep; |
| 121 | u_char dosfilename[12]; |
| 122 | int flags; |
| 123 | int nameiop = cnp->cn_nameiop; |
| 124 | int wincnt = 1; |
| 125 | int chksum = -1, chksum_ok; |
| 126 | int olddos = 1; |
| 127 | |
| 128 | flags = cnp->cn_flags; |
| 129 | |
| 130 | #ifdef MSDOSFS_DEBUG |
| 131 | printf("msdosfs_lookup(): looking for %.*s\n" , |
| 132 | (int)cnp->cn_namelen, cnp->cn_nameptr); |
| 133 | #endif |
| 134 | dp = VTODE(vdp); |
| 135 | pmp = dp->de_pmp; |
| 136 | *vpp = NULL; |
| 137 | #ifdef MSDOSFS_DEBUG |
| 138 | printf("msdosfs_lookup(): vdp %p, dp %p, Attr %02x\n" , |
| 139 | vdp, dp, dp->de_Attributes); |
| 140 | #endif |
| 141 | |
| 142 | /* |
| 143 | * Check accessiblity of directory. |
| 144 | */ |
| 145 | if ((error = VOP_ACCESS(vdp, VEXEC, cnp->cn_cred)) != 0) |
| 146 | return (error); |
| 147 | |
| 148 | if ((flags & ISLASTCN) && (vdp->v_mount->mnt_flag & MNT_RDONLY) && |
| 149 | (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) |
| 150 | return (EROFS); |
| 151 | |
| 152 | /* |
| 153 | * We now have a segment name to search for, and a directory to search. |
| 154 | * |
| 155 | * Before tediously performing a linear scan of the directory, |
| 156 | * check the name cache to see if the directory/name pair |
| 157 | * we are looking for is known already. |
| 158 | */ |
| 159 | if (cache_lookup(vdp, cnp->cn_nameptr, cnp->cn_namelen, |
| 160 | cnp->cn_nameiop, cnp->cn_flags, NULL, vpp)) { |
| 161 | return *vpp == NULLVP ? ENOENT: 0; |
| 162 | } |
| 163 | |
| 164 | /* |
| 165 | * If they are going after the . or .. entry in the root directory, |
| 166 | * they won't find it. DOS filesystems don't have them in the root |
| 167 | * directory. So, we fake it. deget() is in on this scam too. |
| 168 | */ |
| 169 | if ((vdp->v_vflag & VV_ROOT) && cnp->cn_nameptr[0] == '.' && |
| 170 | (cnp->cn_namelen == 1 || |
| 171 | (cnp->cn_namelen == 2 && cnp->cn_nameptr[1] == '.'))) { |
| 172 | isadir = ATTR_DIRECTORY; |
| 173 | scn = MSDOSFSROOT; |
| 174 | #ifdef MSDOSFS_DEBUG |
| 175 | printf("msdosfs_lookup(): looking for . or .. in root directory\n" ); |
| 176 | #endif |
| 177 | cluster = MSDOSFSROOT; |
| 178 | blkoff = MSDOSFSROOT_OFS; |
| 179 | goto foundroot; |
| 180 | } |
| 181 | |
| 182 | switch (unix2dosfn((const u_char *)cnp->cn_nameptr, dosfilename, |
| 183 | cnp->cn_namelen, 0)) { |
| 184 | case 0: |
| 185 | return (EINVAL); |
| 186 | case 1: |
| 187 | break; |
| 188 | case 2: |
| 189 | wincnt = winSlotCnt((const u_char *)cnp->cn_nameptr, |
| 190 | cnp->cn_namelen, pmp->pm_flags & MSDOSFSMNT_UTF8) + 1; |
| 191 | break; |
| 192 | case 3: |
| 193 | olddos = 0; |
| 194 | wincnt = winSlotCnt((const u_char *)cnp->cn_nameptr, |
| 195 | cnp->cn_namelen, pmp->pm_flags & MSDOSFSMNT_UTF8) + 1; |
| 196 | break; |
| 197 | } |
| 198 | if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) |
| 199 | wincnt = 1; |
| 200 | |
| 201 | /* |
| 202 | * Suppress search for slots unless creating |
| 203 | * file and at end of pathname, in which case |
| 204 | * we watch for a place to put the new file in |
| 205 | * case it doesn't already exist. |
| 206 | */ |
| 207 | slotcount = wincnt; |
| 208 | if ((nameiop == CREATE || nameiop == RENAME) && |
| 209 | (flags & ISLASTCN)) |
| 210 | slotcount = 0; |
| 211 | |
| 212 | #ifdef MSDOSFS_DEBUG |
| 213 | printf("msdosfs_lookup(): dos filename: %s\n" , dosfilename); |
| 214 | #endif |
| 215 | /* |
| 216 | * Search the directory pointed at by vdp for the name pointed at |
| 217 | * by cnp->cn_nameptr. |
| 218 | */ |
| 219 | |
| 220 | /* |
| 221 | * The outer loop ranges over the clusters that make up the |
| 222 | * directory. Note that the root directory is different from all |
| 223 | * other directories. It has a fixed number of blocks that are not |
| 224 | * part of the pool of allocatable clusters. So, we treat it a |
| 225 | * little differently. The root directory starts at "cluster" 0. |
| 226 | */ |
| 227 | diroff = 0; |
| 228 | for (frcn = 0; diroff < dp->de_FileSize; frcn++) { |
| 229 | if ((error = pcbmap(dp, frcn, &bn, &cluster, &blsize)) != 0) { |
| 230 | if (error == E2BIG) |
| 231 | break; |
| 232 | return (error); |
| 233 | } |
| 234 | error = bread(pmp->pm_devvp, de_bn2kb(pmp, bn), blsize, |
| 235 | 0, &bp); |
| 236 | if (error) { |
| 237 | return (error); |
| 238 | } |
| 239 | for (blkoff = 0; blkoff < blsize; |
| 240 | blkoff += sizeof(struct direntry), |
| 241 | diroff += sizeof(struct direntry)) { |
| 242 | dep = (struct direntry *)((char *)bp->b_data + blkoff); |
| 243 | /* |
| 244 | * If the slot is empty and we are still looking |
| 245 | * for an empty then remember this one. If the |
| 246 | * slot is not empty then check to see if it |
| 247 | * matches what we are looking for. If the slot |
| 248 | * has never been filled with anything, then the |
| 249 | * remainder of the directory has never been used, |
| 250 | * so there is no point in searching it. |
| 251 | */ |
| 252 | if (dep->deName[0] == SLOT_EMPTY || |
| 253 | dep->deName[0] == SLOT_DELETED) { |
| 254 | /* |
| 255 | * Drop memory of previous long matches |
| 256 | */ |
| 257 | chksum = -1; |
| 258 | |
| 259 | if (slotcount < wincnt) { |
| 260 | slotcount++; |
| 261 | slotoffset = diroff; |
| 262 | } |
| 263 | if (dep->deName[0] == SLOT_EMPTY) { |
| 264 | brelse(bp, 0); |
| 265 | goto notfound; |
| 266 | } |
| 267 | } else { |
| 268 | /* |
| 269 | * If there wasn't enough space for our |
| 270 | * winentries, forget about the empty space |
| 271 | */ |
| 272 | if (slotcount < wincnt) |
| 273 | slotcount = 0; |
| 274 | |
| 275 | /* |
| 276 | * Check for Win95 long filename entry |
| 277 | */ |
| 278 | if (dep->deAttributes == ATTR_WIN95) { |
| 279 | if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) |
| 280 | continue; |
| 281 | |
| 282 | chksum = winChkName((const u_char *)cnp->cn_nameptr, |
| 283 | cnp->cn_namelen, |
| 284 | (struct winentry *)dep, |
| 285 | chksum, |
| 286 | pmp->pm_flags & MSDOSFSMNT_UTF8); |
| 287 | continue; |
| 288 | } |
| 289 | |
| 290 | /* |
| 291 | * Ignore volume labels (anywhere, not just |
| 292 | * the root directory). |
| 293 | */ |
| 294 | if (dep->deAttributes & ATTR_VOLUME) { |
| 295 | chksum = -1; |
| 296 | continue; |
| 297 | } |
| 298 | |
| 299 | /* |
| 300 | * Check for a checksum or name match |
| 301 | */ |
| 302 | chksum_ok = (chksum == winChksum(dep->deName)); |
| 303 | if (!chksum_ok && ( |
| 304 | !olddos || |
| 305 | memcmp(&dosfilename[0],dep->deName,8) || |
| 306 | memcmp(&dosfilename[8],dep->deExtension,3))) { |
| 307 | chksum = -1; |
| 308 | continue; |
| 309 | } |
| 310 | #ifdef MSDOSFS_DEBUG |
| 311 | printf("msdosfs_lookup(): match blkoff %d, diroff %d\n" , |
| 312 | blkoff, diroff); |
| 313 | #endif |
| 314 | /* |
| 315 | * Remember where this directory |
| 316 | * entry came from for whoever did |
| 317 | * this lookup. |
| 318 | */ |
| 319 | dp->de_fndoffset = diroff; |
| 320 | if (chksum_ok && nameiop == RENAME) { |
| 321 | /* |
| 322 | * Target had correct long name |
| 323 | * directory entries, reuse them |
| 324 | * as needed. |
| 325 | */ |
| 326 | dp->de_fndcnt = wincnt - 1; |
| 327 | } else { |
| 328 | /* |
| 329 | * Long name directory entries |
| 330 | * not present or corrupt, can only |
| 331 | * reuse dos directory entry. |
| 332 | */ |
| 333 | dp->de_fndcnt = 0; |
| 334 | } |
| 335 | |
| 336 | goto found; |
| 337 | } |
| 338 | } /* for (blkoff = 0; .... */ |
| 339 | /* |
| 340 | * Release the buffer holding the directory cluster just |
| 341 | * searched. |
| 342 | */ |
| 343 | brelse(bp, 0); |
| 344 | } /* for (frcn = 0; ; frcn++) */ |
| 345 | |
| 346 | notfound: |
| 347 | /* |
| 348 | * We hold no disk buffers at this point. |
| 349 | */ |
| 350 | |
| 351 | /* |
| 352 | * If we get here we didn't find the entry we were looking for. But |
| 353 | * that's ok if we are creating or renaming and are at the end of |
| 354 | * the pathname and the directory hasn't been removed. |
| 355 | */ |
| 356 | #ifdef MSDOSFS_DEBUG |
| 357 | printf("msdosfs_lookup(): op %d, refcnt %ld, slotcount %d, slotoffset %d\n" , |
| 358 | nameiop, dp->de_refcnt, slotcount, slotoffset); |
| 359 | #endif |
| 360 | if ((nameiop == CREATE || nameiop == RENAME) && |
| 361 | (flags & ISLASTCN) && dp->de_refcnt != 0) { |
| 362 | /* |
| 363 | * Access for write is interpreted as allowing |
| 364 | * creation of files in the directory. |
| 365 | */ |
| 366 | error = VOP_ACCESS(vdp, VWRITE, cnp->cn_cred); |
| 367 | if (error) |
| 368 | return (error); |
| 369 | |
| 370 | /* |
| 371 | * Fixup the slot description to point to the place where |
| 372 | * we might put the new DOS direntry (putting the Win95 |
| 373 | * long name entries before that) |
| 374 | */ |
| 375 | if (!slotcount) { |
| 376 | slotcount = 1; |
| 377 | slotoffset = diroff; |
| 378 | } |
| 379 | if (wincnt > slotcount) { |
| 380 | slotoffset += |
| 381 | sizeof(struct direntry) * (wincnt - slotcount); |
| 382 | } |
| 383 | |
| 384 | /* |
| 385 | * Return an indication of where the new directory |
| 386 | * entry should be put. |
| 387 | */ |
| 388 | dp->de_fndoffset = slotoffset; |
| 389 | dp->de_fndcnt = wincnt - 1; |
| 390 | |
| 391 | /* |
| 392 | * We return with the directory locked, so that |
| 393 | * the parameters we set up above will still be |
| 394 | * valid if we actually decide to do a direnter(). |
| 395 | * We return ni_vp == NULL to indicate that the entry |
| 396 | * does not currently exist; we leave a pointer to |
| 397 | * the (locked) directory inode in ndp->ni_dvp. |
| 398 | * |
| 399 | * NB - if the directory is unlocked, then this |
| 400 | * information cannot be used. |
| 401 | */ |
| 402 | return (EJUSTRETURN); |
| 403 | } |
| 404 | |
| 405 | #if 0 |
| 406 | /* |
| 407 | * Insert name into cache (as non-existent) if appropriate. |
| 408 | * |
| 409 | * XXX Negative caching is broken for msdosfs because the name |
| 410 | * cache doesn't understand peculiarities such as case insensitivity |
| 411 | * and 8.3 filenames. Hence, it may not invalidate all negative |
| 412 | * entries if a file with this name is later created. |
| 413 | * e.g. creating a file 'foo' won't invalidate a negative entry |
| 414 | * for 'FOO'. |
| 415 | */ |
| 416 | if (nameiop != CREATE) |
| 417 | cache_enter(vdp, *vpp, cnp->cn_nameptr, cnp->cn_namelen, |
| 418 | cnp->cn_flags); |
| 419 | #endif |
| 420 | |
| 421 | return (ENOENT); |
| 422 | |
| 423 | found: |
| 424 | /* |
| 425 | * NOTE: We still have the buffer with matched directory entry at |
| 426 | * this point. |
| 427 | */ |
| 428 | isadir = dep->deAttributes & ATTR_DIRECTORY; |
| 429 | scn = getushort(dep->deStartCluster); |
| 430 | if (FAT32(pmp)) { |
| 431 | scn |= getushort(dep->deHighClust) << 16; |
| 432 | if (scn == pmp->pm_rootdirblk) { |
| 433 | /* |
| 434 | * There should actually be 0 here. |
| 435 | * Just ignore the error. |
| 436 | */ |
| 437 | scn = MSDOSFSROOT; |
| 438 | } |
| 439 | } |
| 440 | |
| 441 | if (isadir) { |
| 442 | cluster = scn; |
| 443 | if (cluster == MSDOSFSROOT) |
| 444 | blkoff = MSDOSFSROOT_OFS; |
| 445 | else |
| 446 | blkoff = 0; |
| 447 | } else if (cluster == MSDOSFSROOT) |
| 448 | blkoff = diroff; |
| 449 | |
| 450 | /* |
| 451 | * Now release buf to allow deget to read the entry again. |
| 452 | * Reserving it here and giving it to deget could result |
| 453 | * in a deadlock. |
| 454 | */ |
| 455 | brelse(bp, 0); |
| 456 | |
| 457 | foundroot: |
| 458 | /* |
| 459 | * If we entered at foundroot, then we are looking for the . or .. |
| 460 | * entry of the filesystems root directory. isadir and scn were |
| 461 | * setup before jumping here. And, bp is already null. |
| 462 | */ |
| 463 | if (FAT32(pmp) && scn == MSDOSFSROOT) |
| 464 | scn = pmp->pm_rootdirblk; |
| 465 | |
| 466 | /* |
| 467 | * If deleting, and at end of pathname, return |
| 468 | * parameters which can be used to remove file. |
| 469 | * Lock the inode, being careful with ".". |
| 470 | */ |
| 471 | if (nameiop == DELETE && (flags & ISLASTCN)) { |
| 472 | /* |
| 473 | * Don't allow deleting the root. |
| 474 | */ |
| 475 | if (blkoff == MSDOSFSROOT_OFS) |
| 476 | return EINVAL; |
| 477 | |
| 478 | /* |
| 479 | * Write access to directory required to delete files. |
| 480 | */ |
| 481 | error = VOP_ACCESS(vdp, VWRITE, cnp->cn_cred); |
| 482 | if (error) |
| 483 | return (error); |
| 484 | |
| 485 | /* |
| 486 | * Return pointer to current entry in dp->i_offset. |
| 487 | * Save directory inode pointer in ndp->ni_dvp for dirremove(). |
| 488 | */ |
| 489 | if (dp->de_StartCluster == scn && isadir) { /* "." */ |
| 490 | vref(vdp); |
| 491 | *vpp = vdp; |
| 492 | return (0); |
| 493 | } |
| 494 | error = deget(pmp, cluster, blkoff, vpp); |
| 495 | return error; |
| 496 | } |
| 497 | |
| 498 | /* |
| 499 | * If rewriting (RENAME), return the inode and the |
| 500 | * information required to rewrite the present directory |
| 501 | * Must get inode of directory entry to verify it's a |
| 502 | * regular file, or empty directory. |
| 503 | */ |
| 504 | if (nameiop == RENAME && (flags & ISLASTCN)) { |
| 505 | |
| 506 | if (vdp->v_mount->mnt_flag & MNT_RDONLY) |
| 507 | return (EROFS); |
| 508 | |
| 509 | if (blkoff == MSDOSFSROOT_OFS) |
| 510 | return EINVAL; |
| 511 | |
| 512 | error = VOP_ACCESS(vdp, VWRITE, cnp->cn_cred); |
| 513 | if (error) |
| 514 | return (error); |
| 515 | |
| 516 | /* |
| 517 | * Careful about locking second inode. |
| 518 | * This can only occur if the target is ".". |
| 519 | */ |
| 520 | if (dp->de_StartCluster == scn && isadir) |
| 521 | return (EISDIR); |
| 522 | |
| 523 | error = deget(pmp, cluster, blkoff, vpp); |
| 524 | return error; |
| 525 | } |
| 526 | |
| 527 | if (dp->de_StartCluster == scn && isadir) { |
| 528 | vref(vdp); /* we want ourself, ie "." */ |
| 529 | *vpp = vdp; |
| 530 | } else if ((error = deget(pmp, cluster, blkoff, vpp)) != 0) { |
| 531 | return error; |
| 532 | } |
| 533 | |
| 534 | /* |
| 535 | * Insert name into cache if appropriate. |
| 536 | */ |
| 537 | cache_enter(vdp, *vpp, cnp->cn_nameptr, cnp->cn_namelen, cnp->cn_flags); |
| 538 | |
| 539 | return 0; |
| 540 | } |
| 541 | #endif /* _KERNEL */ |
| 542 | |
| 543 | /* |
| 544 | * dep - directory entry to copy into the directory |
| 545 | * ddep - directory to add to |
| 546 | * depp - return the address of the denode for the created directory entry |
| 547 | * if depp != 0 |
| 548 | * cnp - componentname needed for Win95 long filenames |
| 549 | */ |
| 550 | int |
| 551 | createde(struct denode *dep, struct denode *ddep, struct denode **depp, struct componentname *cnp) |
| 552 | { |
| 553 | int error, rberror; |
| 554 | u_long dirclust, clusoffset; |
| 555 | u_long fndoffset, havecnt = 0, wcnt = 1, i; |
| 556 | struct direntry *ndep; |
| 557 | struct msdosfsmount *pmp = ddep->de_pmp; |
| 558 | struct buf *bp; |
| 559 | daddr_t bn; |
| 560 | int blsize; |
| 561 | #ifdef _KERNEL |
| 562 | int async = ddep->de_pmp->pm_mountp->mnt_flag & MNT_ASYNC; |
| 563 | #else |
| 564 | #define async 0 |
| 565 | #endif |
| 566 | |
| 567 | #ifdef MSDOSFS_DEBUG |
| 568 | printf("createde(dep %p, ddep %p, depp %p, cnp %p)\n" , |
| 569 | dep, ddep, depp, cnp); |
| 570 | #endif |
| 571 | |
| 572 | /* |
| 573 | * If no space left in the directory then allocate another cluster |
| 574 | * and chain it onto the end of the file. There is one exception |
| 575 | * to this. That is, if the root directory has no more space it |
| 576 | * can NOT be expanded. extendfile() checks for and fails attempts |
| 577 | * to extend the root directory. We just return an error in that |
| 578 | * case. |
| 579 | */ |
| 580 | if (ddep->de_fndoffset >= ddep->de_FileSize) { |
| 581 | u_long needlen = ddep->de_fndoffset + sizeof(struct direntry) |
| 582 | - ddep->de_FileSize; |
| 583 | dirclust = de_clcount(pmp, needlen); |
| 584 | if ((error = extendfile(ddep, dirclust, 0, 0, DE_CLEAR)) != 0) { |
| 585 | (void)detrunc(ddep, ddep->de_FileSize, 0, NOCRED); |
| 586 | goto err_norollback; |
| 587 | } |
| 588 | |
| 589 | /* |
| 590 | * Update the size of the directory |
| 591 | */ |
| 592 | ddep->de_FileSize += de_cn2off(pmp, dirclust); |
| 593 | } |
| 594 | |
| 595 | /* |
| 596 | * We just read in the cluster with space. Copy the new directory |
| 597 | * entry in. Then write it to disk. NOTE: DOS directories |
| 598 | * do not get smaller as clusters are emptied. |
| 599 | */ |
| 600 | error = pcbmap(ddep, de_cluster(pmp, ddep->de_fndoffset), |
| 601 | &bn, &dirclust, &blsize); |
| 602 | if (error) |
| 603 | goto err_norollback; |
| 604 | clusoffset = ddep->de_fndoffset; |
| 605 | if (dirclust != MSDOSFSROOT) |
| 606 | clusoffset &= pmp->pm_crbomask; |
| 607 | if ((error = bread(pmp->pm_devvp, de_bn2kb(pmp, bn), blsize, |
| 608 | B_MODIFY, &bp)) != 0) { |
| 609 | goto err_norollback; |
| 610 | } |
| 611 | ndep = bptoep(pmp, bp, clusoffset); |
| 612 | |
| 613 | DE_EXTERNALIZE(ndep, dep); |
| 614 | |
| 615 | /* |
| 616 | * Now write the Win95 long name |
| 617 | */ |
| 618 | if (ddep->de_fndcnt > 0) { |
| 619 | u_int8_t chksum = winChksum(ndep->deName); |
| 620 | const u_char *un = (const u_char *)cnp->cn_nameptr; |
| 621 | int unlen = cnp->cn_namelen; |
| 622 | u_long xhavecnt; |
| 623 | |
| 624 | fndoffset = ddep->de_fndoffset; |
| 625 | xhavecnt = ddep->de_fndcnt + 1; |
| 626 | |
| 627 | for(; wcnt < xhavecnt; wcnt++) { |
| 628 | if ((fndoffset & pmp->pm_crbomask) == 0) { |
| 629 | /* we should never get here if ddep is root |
| 630 | * directory */ |
| 631 | |
| 632 | if (async) |
| 633 | (void) bdwrite(bp); |
| 634 | else if ((error = bwrite(bp)) != 0) |
| 635 | goto rollback; |
| 636 | |
| 637 | fndoffset -= sizeof(struct direntry); |
| 638 | error = pcbmap(ddep, |
| 639 | de_cluster(pmp, fndoffset), |
| 640 | &bn, 0, &blsize); |
| 641 | if (error) |
| 642 | goto rollback; |
| 643 | |
| 644 | error = bread(pmp->pm_devvp, de_bn2kb(pmp, bn), |
| 645 | blsize, B_MODIFY, &bp); |
| 646 | if (error) { |
| 647 | goto rollback; |
| 648 | } |
| 649 | ndep = bptoep(pmp, bp, |
| 650 | fndoffset & pmp->pm_crbomask); |
| 651 | } else { |
| 652 | ndep--; |
| 653 | fndoffset -= sizeof(struct direntry); |
| 654 | } |
| 655 | if (!unix2winfn(un, unlen, (struct winentry *)ndep, |
| 656 | wcnt, chksum, |
| 657 | ddep->de_pmp->pm_flags & MSDOSFSMNT_UTF8)) |
| 658 | break; |
| 659 | } |
| 660 | } |
| 661 | |
| 662 | if (async) |
| 663 | bdwrite(bp); |
| 664 | else if ((error = bwrite(bp)) != 0) |
| 665 | goto rollback; |
| 666 | |
| 667 | /* |
| 668 | * If they want us to return with the denode gotten. |
| 669 | */ |
| 670 | if (depp) { |
| 671 | u_long diroffset = clusoffset; |
| 672 | |
| 673 | if (dep->de_Attributes & ATTR_DIRECTORY) { |
| 674 | dirclust = dep->de_StartCluster; |
| 675 | if (FAT32(pmp) && dirclust == pmp->pm_rootdirblk) |
| 676 | dirclust = MSDOSFSROOT; |
| 677 | if (dirclust == MSDOSFSROOT) |
| 678 | diroffset = MSDOSFSROOT_OFS; |
| 679 | else |
| 680 | diroffset = 0; |
| 681 | } |
| 682 | #ifdef MAKEFS |
| 683 | error = deget(pmp, dirclust, diroffset, depp); |
| 684 | #else |
| 685 | struct vnode *vp; |
| 686 | |
| 687 | error = deget(pmp, dirclust, diroffset, &vp); |
| 688 | if (error == 0) |
| 689 | *depp = VTODE(vp); |
| 690 | else |
| 691 | *depp = NULL; |
| 692 | #endif |
| 693 | return error; |
| 694 | } |
| 695 | |
| 696 | return 0; |
| 697 | |
| 698 | rollback: |
| 699 | /* |
| 700 | * Mark all slots modified so far as deleted. Note that we |
| 701 | * can't just call removede(), since directory is not in |
| 702 | * consistent state. |
| 703 | */ |
| 704 | fndoffset = ddep->de_fndoffset; |
| 705 | rberror = pcbmap(ddep, de_cluster(pmp, fndoffset), |
| 706 | &bn, NULL, &blsize); |
| 707 | if (rberror) |
| 708 | goto err_norollback; |
| 709 | if ((rberror = bread(pmp->pm_devvp, de_bn2kb(pmp, bn), blsize, |
| 710 | B_MODIFY, &bp)) != 0) { |
| 711 | goto err_norollback; |
| 712 | } |
| 713 | ndep = bptoep(pmp, bp, clusoffset); |
| 714 | |
| 715 | havecnt = ddep->de_fndcnt + 1; |
| 716 | for(i = wcnt; i <= havecnt; i++) { |
| 717 | /* mark entry as deleted */ |
| 718 | ndep->deName[0] = SLOT_DELETED; |
| 719 | |
| 720 | if ((fndoffset & pmp->pm_crbomask) == 0) { |
| 721 | /* we should never get here if ddep is root |
| 722 | * directory */ |
| 723 | |
| 724 | if (async) |
| 725 | bdwrite(bp); |
| 726 | else if ((rberror = bwrite(bp)) != 0) |
| 727 | goto err_norollback; |
| 728 | |
| 729 | fndoffset -= sizeof(struct direntry); |
| 730 | rberror = pcbmap(ddep, |
| 731 | de_cluster(pmp, fndoffset), |
| 732 | &bn, 0, &blsize); |
| 733 | if (rberror) |
| 734 | goto err_norollback; |
| 735 | |
| 736 | rberror = bread(pmp->pm_devvp, de_bn2kb(pmp, bn), |
| 737 | blsize, B_MODIFY, &bp); |
| 738 | if (rberror) { |
| 739 | goto err_norollback; |
| 740 | } |
| 741 | ndep = bptoep(pmp, bp, fndoffset); |
| 742 | } else { |
| 743 | ndep--; |
| 744 | fndoffset -= sizeof(struct direntry); |
| 745 | } |
| 746 | } |
| 747 | |
| 748 | /* ignore any further error */ |
| 749 | if (async) |
| 750 | (void) bdwrite(bp); |
| 751 | else |
| 752 | (void) bwrite(bp); |
| 753 | |
| 754 | err_norollback: |
| 755 | return error; |
| 756 | } |
| 757 | |
| 758 | /* |
| 759 | * Be sure a directory is empty except for "." and "..". Return 1 if empty, |
| 760 | * return 0 if not empty or error. |
| 761 | */ |
| 762 | int |
| 763 | dosdirempty(struct denode *dep) |
| 764 | { |
| 765 | int blsize; |
| 766 | int error; |
| 767 | u_long cn; |
| 768 | daddr_t bn; |
| 769 | struct buf *bp; |
| 770 | struct msdosfsmount *pmp = dep->de_pmp; |
| 771 | struct direntry *dentp; |
| 772 | |
| 773 | /* |
| 774 | * Since the filesize field in directory entries for a directory is |
| 775 | * zero, we just have to feel our way through the directory until |
| 776 | * we hit end of file. |
| 777 | */ |
| 778 | for (cn = 0;; cn++) { |
| 779 | if ((error = pcbmap(dep, cn, &bn, 0, &blsize)) != 0) { |
| 780 | if (error == E2BIG) |
| 781 | return (1); /* it's empty */ |
| 782 | return (0); |
| 783 | } |
| 784 | error = bread(pmp->pm_devvp, de_bn2kb(pmp, bn), blsize, |
| 785 | 0, &bp); |
| 786 | if (error) { |
| 787 | return (0); |
| 788 | } |
| 789 | for (dentp = (struct direntry *)bp->b_data; |
| 790 | (char *)dentp < (char *)bp->b_data + blsize; |
| 791 | dentp++) { |
| 792 | if (dentp->deName[0] != SLOT_DELETED && |
| 793 | (dentp->deAttributes & ATTR_VOLUME) == 0) { |
| 794 | /* |
| 795 | * In dos directories an entry whose name |
| 796 | * starts with SLOT_EMPTY (0) starts the |
| 797 | * beginning of the unused part of the |
| 798 | * directory, so we can just return that it |
| 799 | * is empty. |
| 800 | */ |
| 801 | if (dentp->deName[0] == SLOT_EMPTY) { |
| 802 | brelse(bp, 0); |
| 803 | return (1); |
| 804 | } |
| 805 | /* |
| 806 | * Any names other than "." and ".." in a |
| 807 | * directory mean it is not empty. |
| 808 | */ |
| 809 | if (memcmp(dentp->deName, ". " , 11) && |
| 810 | memcmp(dentp->deName, ".. " , 11)) { |
| 811 | brelse(bp, 0); |
| 812 | #ifdef MSDOSFS_DEBUG |
| 813 | printf("dosdirempty(): found %.11s, %d, %d\n" , |
| 814 | dentp->deName, dentp->deName[0], |
| 815 | dentp->deName[1]); |
| 816 | #endif |
| 817 | return (0); /* not empty */ |
| 818 | } |
| 819 | } |
| 820 | } |
| 821 | brelse(bp, 0); |
| 822 | } |
| 823 | /* NOTREACHED */ |
| 824 | } |
| 825 | |
| 826 | /* |
| 827 | * Check to see if the directory described by target is in some |
| 828 | * subdirectory of source. This prevents something like the following from |
| 829 | * succeeding and leaving a bunch or files and directories orphaned. mv |
| 830 | * /a/b/c /a/b/c/d/e/f Where c and f are directories. |
| 831 | * |
| 832 | * source - the inode for /a/b/c |
| 833 | * target - the inode for /a/b/c/d/e/f |
| 834 | * |
| 835 | * Returns 0 if target is NOT a subdirectory of source. |
| 836 | * Otherwise returns a non-zero error number. |
| 837 | * The target inode is always unlocked on return. |
| 838 | */ |
| 839 | int |
| 840 | doscheckpath(struct denode *source, struct denode *target) |
| 841 | { |
| 842 | u_long scn; |
| 843 | struct msdosfsmount *pmp; |
| 844 | struct direntry *ep; |
| 845 | struct denode *dep; |
| 846 | struct buf *bp = NULL; |
| 847 | int error = 0; |
| 848 | |
| 849 | dep = target; |
| 850 | if ((target->de_Attributes & ATTR_DIRECTORY) == 0 || |
| 851 | (source->de_Attributes & ATTR_DIRECTORY) == 0) { |
| 852 | error = ENOTDIR; |
| 853 | goto out; |
| 854 | } |
| 855 | if (dep->de_StartCluster == source->de_StartCluster) { |
| 856 | error = EEXIST; |
| 857 | goto out; |
| 858 | } |
| 859 | if (dep->de_StartCluster == MSDOSFSROOT) |
| 860 | goto out; |
| 861 | pmp = dep->de_pmp; |
| 862 | #ifdef DIAGNOSTIC |
| 863 | if (pmp != source->de_pmp) |
| 864 | panic("doscheckpath: source and target on different filesystems" ); |
| 865 | #endif |
| 866 | if (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk) |
| 867 | goto out; |
| 868 | |
| 869 | for (;;) { |
| 870 | if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) { |
| 871 | error = ENOTDIR; |
| 872 | break; |
| 873 | } |
| 874 | scn = dep->de_StartCluster; |
| 875 | error = bread(pmp->pm_devvp, de_bn2kb(pmp, cntobn(pmp, scn)), |
| 876 | pmp->pm_bpcluster, 0, &bp); |
| 877 | if (error) |
| 878 | break; |
| 879 | |
| 880 | ep = (struct direntry *) bp->b_data + 1; |
| 881 | if ((ep->deAttributes & ATTR_DIRECTORY) == 0 || |
| 882 | memcmp(ep->deName, ".. " , 11) != 0) { |
| 883 | error = ENOTDIR; |
| 884 | break; |
| 885 | } |
| 886 | scn = getushort(ep->deStartCluster); |
| 887 | if (FAT32(pmp)) |
| 888 | scn |= getushort(ep->deHighClust) << 16; |
| 889 | |
| 890 | if (scn == source->de_StartCluster) { |
| 891 | error = EINVAL; |
| 892 | break; |
| 893 | } |
| 894 | if (scn == MSDOSFSROOT) |
| 895 | break; |
| 896 | if (FAT32(pmp) && scn == pmp->pm_rootdirblk) { |
| 897 | /* |
| 898 | * scn should be 0 in this case, |
| 899 | * but we silently ignore the error. |
| 900 | */ |
| 901 | break; |
| 902 | } |
| 903 | |
| 904 | vput(DETOV(dep)); |
| 905 | brelse(bp, 0); |
| 906 | bp = NULL; |
| 907 | #ifdef MAKEFS |
| 908 | /* NOTE: deget() clears dep on error */ |
| 909 | if ((error = deget(pmp, scn, 0, &dep)) != 0) |
| 910 | break; |
| 911 | #else |
| 912 | struct vnode *vp; |
| 913 | |
| 914 | dep = NULL; |
| 915 | error = deget(pmp, scn, 0, &vp); |
| 916 | if (error) |
| 917 | break; |
| 918 | error = vn_lock(vp, LK_EXCLUSIVE); |
| 919 | if (error) { |
| 920 | vrele(vp); |
| 921 | break; |
| 922 | } |
| 923 | dep = VTODE(vp); |
| 924 | #endif |
| 925 | } |
| 926 | out: |
| 927 | if (bp) |
| 928 | brelse(bp, 0); |
| 929 | if (error == ENOTDIR) |
| 930 | printf("doscheckpath(): .. not a directory?\n" ); |
| 931 | if (dep != NULL) |
| 932 | vput(DETOV(dep)); |
| 933 | return (error); |
| 934 | } |
| 935 | |
| 936 | /* |
| 937 | * Read in the disk block containing the directory entry (dirclu, dirofs) |
| 938 | * and return the address of the buf header, and the address of the |
| 939 | * directory entry within the block. |
| 940 | */ |
| 941 | int |
| 942 | readep(struct msdosfsmount *pmp, u_long dirclust, u_long diroffset, struct buf **bpp, struct direntry **epp) |
| 943 | { |
| 944 | int error; |
| 945 | daddr_t bn; |
| 946 | int blsize; |
| 947 | |
| 948 | blsize = pmp->pm_bpcluster; |
| 949 | if (dirclust == MSDOSFSROOT |
| 950 | && de_blk(pmp, diroffset + blsize) > pmp->pm_rootdirsize) |
| 951 | blsize = de_bn2off(pmp, pmp->pm_rootdirsize) & pmp->pm_crbomask; |
| 952 | bn = detobn(pmp, dirclust, diroffset); |
| 953 | if ((error = bread(pmp->pm_devvp, de_bn2kb(pmp, bn), blsize, |
| 954 | 0, bpp)) != 0) { |
| 955 | *bpp = NULL; |
| 956 | return (error); |
| 957 | } |
| 958 | if (epp) |
| 959 | *epp = bptoep(pmp, *bpp, diroffset); |
| 960 | return (0); |
| 961 | } |
| 962 | |
| 963 | /* |
| 964 | * Read in the disk block containing the directory entry dep came from and |
| 965 | * return the address of the buf header, and the address of the directory |
| 966 | * entry within the block. |
| 967 | */ |
| 968 | int |
| 969 | readde(struct denode *dep, struct buf **bpp, struct direntry **epp) |
| 970 | { |
| 971 | return (readep(dep->de_pmp, dep->de_dirclust, dep->de_diroffset, |
| 972 | bpp, epp)); |
| 973 | } |
| 974 | |
| 975 | /* |
| 976 | * Remove a directory entry. At this point the file represented by the |
| 977 | * directory entry to be removed is still full length until noone has it |
| 978 | * open. When the file no longer being used msdosfs_inactive() is called |
| 979 | * and will truncate the file to 0 length. When the vnode containing the |
| 980 | * denode is needed for some other purpose by VFS it will call |
| 981 | * msdosfs_reclaim() which will remove the denode from the denode cache. |
| 982 | */ |
| 983 | int |
| 984 | removede(struct denode *pdep, struct denode *dep) |
| 985 | /* pdep: directory where the entry is removed */ |
| 986 | /* dep: file to be removed */ |
| 987 | { |
| 988 | int error; |
| 989 | struct direntry *ep; |
| 990 | struct buf *bp; |
| 991 | daddr_t bn; |
| 992 | int blsize; |
| 993 | struct msdosfsmount *pmp = pdep->de_pmp; |
| 994 | u_long offset = pdep->de_fndoffset; |
| 995 | #ifdef _KERNEL |
| 996 | int async = pdep->de_pmp->pm_mountp->mnt_flag & MNT_ASYNC; |
| 997 | #else |
| 998 | #define async 0 |
| 999 | #endif |
| 1000 | |
| 1001 | #ifdef MSDOSFS_DEBUG |
| 1002 | printf("removede(): filename %s, dep %p, offset %08lx\n" , |
| 1003 | dep->de_Name, dep, offset); |
| 1004 | #endif |
| 1005 | |
| 1006 | if (--dep->de_refcnt == 0) { |
| 1007 | #ifndef MAKEFS |
| 1008 | struct denode_key old_key = dep->de_key; |
| 1009 | struct denode_key new_key = dep->de_key; |
| 1010 | |
| 1011 | KASSERT(new_key.dk_dirgen == NULL); |
| 1012 | new_key.dk_dirgen = dep; |
| 1013 | vcache_rekey_enter(pmp->pm_mountp, DETOV(dep), &old_key, |
| 1014 | sizeof(old_key), &new_key, sizeof(new_key)); |
| 1015 | dep->de_key = new_key; |
| 1016 | vcache_rekey_exit(pmp->pm_mountp, DETOV(dep), &old_key, |
| 1017 | sizeof(old_key), &dep->de_key, sizeof(dep->de_key)); |
| 1018 | #endif |
| 1019 | } |
| 1020 | offset += sizeof(struct direntry); |
| 1021 | do { |
| 1022 | offset -= sizeof(struct direntry); |
| 1023 | error = pcbmap(pdep, de_cluster(pmp, offset), &bn, 0, &blsize); |
| 1024 | if (error) |
| 1025 | return error; |
| 1026 | error = bread(pmp->pm_devvp, de_bn2kb(pmp, bn), blsize, |
| 1027 | B_MODIFY, &bp); |
| 1028 | if (error) { |
| 1029 | return error; |
| 1030 | } |
| 1031 | ep = bptoep(pmp, bp, offset); |
| 1032 | /* |
| 1033 | * Check whether, if we came here the second time, i.e. |
| 1034 | * when underflowing into the previous block, the last |
| 1035 | * entry in this block is a longfilename entry, too. |
| 1036 | */ |
| 1037 | if (ep->deAttributes != ATTR_WIN95 |
| 1038 | && offset != pdep->de_fndoffset) { |
| 1039 | brelse(bp, 0); |
| 1040 | break; |
| 1041 | } |
| 1042 | offset += sizeof(struct direntry); |
| 1043 | while (1) { |
| 1044 | /* |
| 1045 | * We are a bit agressive here in that we delete any Win95 |
| 1046 | * entries preceding this entry, not just the ones we "own". |
| 1047 | * Since these presumably aren't valid anyway, |
| 1048 | * there should be no harm. |
| 1049 | */ |
| 1050 | offset -= sizeof(struct direntry); |
| 1051 | ep--->deName[0] = SLOT_DELETED; |
| 1052 | if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) |
| 1053 | || !(offset & pmp->pm_crbomask) |
| 1054 | || ep->deAttributes != ATTR_WIN95) |
| 1055 | break; |
| 1056 | } |
| 1057 | if (async) |
| 1058 | bdwrite(bp); |
| 1059 | else if ((error = bwrite(bp)) != 0) |
| 1060 | return error; |
| 1061 | } while (!(pmp->pm_flags & MSDOSFSMNT_NOWIN95) |
| 1062 | && !(offset & pmp->pm_crbomask) |
| 1063 | && offset); |
| 1064 | return 0; |
| 1065 | } |
| 1066 | |
| 1067 | /* |
| 1068 | * Create a unique DOS name in dvp |
| 1069 | */ |
| 1070 | int |
| 1071 | uniqdosname(struct denode *dep, struct componentname *cnp, u_char *cp) |
| 1072 | { |
| 1073 | struct msdosfsmount *pmp = dep->de_pmp; |
| 1074 | struct direntry *dentp; |
| 1075 | int gen; |
| 1076 | int blsize; |
| 1077 | u_long cn; |
| 1078 | daddr_t bn; |
| 1079 | struct buf *bp; |
| 1080 | int error; |
| 1081 | |
| 1082 | for (gen = 1;; gen++) { |
| 1083 | /* |
| 1084 | * Generate DOS name with generation number |
| 1085 | */ |
| 1086 | if (!unix2dosfn((const u_char *)cnp->cn_nameptr, cp, |
| 1087 | cnp->cn_namelen, gen)) |
| 1088 | return gen == 1 ? EINVAL : EEXIST; |
| 1089 | |
| 1090 | /* |
| 1091 | * Now look for a dir entry with this exact name |
| 1092 | */ |
| 1093 | for (cn = error = 0; !error; cn++) { |
| 1094 | if ((error = pcbmap(dep, cn, &bn, 0, &blsize)) != 0) { |
| 1095 | if (error == E2BIG) /* EOF reached and not found */ |
| 1096 | return 0; |
| 1097 | return error; |
| 1098 | } |
| 1099 | error = bread(pmp->pm_devvp, de_bn2kb(pmp, bn), blsize, |
| 1100 | 0, &bp); |
| 1101 | if (error) { |
| 1102 | return error; |
| 1103 | } |
| 1104 | for (dentp = (struct direntry *)bp->b_data; |
| 1105 | (char *)dentp < (char *)bp->b_data + blsize; |
| 1106 | dentp++) { |
| 1107 | if (dentp->deName[0] == SLOT_EMPTY) { |
| 1108 | /* |
| 1109 | * Last used entry and not found |
| 1110 | */ |
| 1111 | brelse(bp, 0); |
| 1112 | return 0; |
| 1113 | } |
| 1114 | /* |
| 1115 | * Ignore volume labels and Win95 entries |
| 1116 | */ |
| 1117 | if (dentp->deAttributes & ATTR_VOLUME) |
| 1118 | continue; |
| 1119 | if (!memcmp(dentp->deName, cp, 11)) { |
| 1120 | error = EEXIST; |
| 1121 | break; |
| 1122 | } |
| 1123 | } |
| 1124 | brelse(bp, 0); |
| 1125 | } |
| 1126 | } |
| 1127 | } |
| 1128 | |
| 1129 | /* |
| 1130 | * Find any Win'95 long filename entry in directory dep |
| 1131 | */ |
| 1132 | int |
| 1133 | findwin95(struct denode *dep) |
| 1134 | { |
| 1135 | struct msdosfsmount *pmp = dep->de_pmp; |
| 1136 | struct direntry *dentp; |
| 1137 | int blsize, win95; |
| 1138 | u_long cn; |
| 1139 | daddr_t bn; |
| 1140 | struct buf *bp; |
| 1141 | |
| 1142 | win95 = 1; |
| 1143 | /* |
| 1144 | * Read through the directory looking for Win'95 entries |
| 1145 | * XXX Note: Error currently handled just as EOF |
| 1146 | */ |
| 1147 | for (cn = 0;; cn++) { |
| 1148 | if (pcbmap(dep, cn, &bn, 0, &blsize)) |
| 1149 | return win95; |
| 1150 | if (bread(pmp->pm_devvp, de_bn2kb(pmp, bn), blsize, |
| 1151 | 0, &bp)) { |
| 1152 | return win95; |
| 1153 | } |
| 1154 | for (dentp = (struct direntry *)bp->b_data; |
| 1155 | (char *)dentp < (char *)bp->b_data + blsize; |
| 1156 | dentp++) { |
| 1157 | if (dentp->deName[0] == SLOT_EMPTY) { |
| 1158 | /* |
| 1159 | * Last used entry and not found |
| 1160 | */ |
| 1161 | brelse(bp, 0); |
| 1162 | return win95; |
| 1163 | } |
| 1164 | if (dentp->deName[0] == SLOT_DELETED) { |
| 1165 | /* |
| 1166 | * Ignore deleted files |
| 1167 | * Note: might be an indication of Win'95 |
| 1168 | * anyway XXX |
| 1169 | */ |
| 1170 | continue; |
| 1171 | } |
| 1172 | if (dentp->deAttributes == ATTR_WIN95) { |
| 1173 | brelse(bp, 0); |
| 1174 | return 1; |
| 1175 | } |
| 1176 | win95 = 0; |
| 1177 | } |
| 1178 | brelse(bp, 0); |
| 1179 | } |
| 1180 | } |
| 1181 | |