msdosfs_vnops.c revision 1.15.4.2
1 1.15.4.2 yamt /* $NetBSD: msdosfs_vnops.c,v 1.15.4.2 2014/05/22 11:43:05 yamt Exp $ */ 2 1.15.4.2 yamt 3 1.15.4.2 yamt /*- 4 1.15.4.2 yamt * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. 5 1.15.4.2 yamt * Copyright (C) 1994, 1995, 1997 TooLs GmbH. 6 1.15.4.2 yamt * All rights reserved. 7 1.15.4.2 yamt * Original code by Paul Popelka (paulp (at) uts.amdahl.com) (see below). 8 1.15.4.2 yamt * 9 1.15.4.2 yamt * Redistribution and use in source and binary forms, with or without 10 1.15.4.2 yamt * modification, are permitted provided that the following conditions 11 1.15.4.2 yamt * are met: 12 1.15.4.2 yamt * 1. Redistributions of source code must retain the above copyright 13 1.15.4.2 yamt * notice, this list of conditions and the following disclaimer. 14 1.15.4.2 yamt * 2. Redistributions in binary form must reproduce the above copyright 15 1.15.4.2 yamt * notice, this list of conditions and the following disclaimer in the 16 1.15.4.2 yamt * documentation and/or other materials provided with the distribution. 17 1.15.4.2 yamt * 3. All advertising materials mentioning features or use of this software 18 1.15.4.2 yamt * must display the following acknowledgement: 19 1.15.4.2 yamt * This product includes software developed by TooLs GmbH. 20 1.15.4.2 yamt * 4. The name of TooLs GmbH may not be used to endorse or promote products 21 1.15.4.2 yamt * derived from this software without specific prior written permission. 22 1.15.4.2 yamt * 23 1.15.4.2 yamt * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 24 1.15.4.2 yamt * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 25 1.15.4.2 yamt * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26 1.15.4.2 yamt * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 27 1.15.4.2 yamt * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 28 1.15.4.2 yamt * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 29 1.15.4.2 yamt * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 30 1.15.4.2 yamt * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 31 1.15.4.2 yamt * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 32 1.15.4.2 yamt * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 1.15.4.2 yamt */ 34 1.15.4.2 yamt /* 35 1.15.4.2 yamt * Written by Paul Popelka (paulp (at) uts.amdahl.com) 36 1.15.4.2 yamt * 37 1.15.4.2 yamt * You can do anything you want with this software, just don't say you wrote 38 1.15.4.2 yamt * it, and don't remove this notice. 39 1.15.4.2 yamt * 40 1.15.4.2 yamt * This software is provided "as is". 41 1.15.4.2 yamt * 42 1.15.4.2 yamt * The author supplies this software to be publicly redistributed on the 43 1.15.4.2 yamt * understanding that the author is not responsible for the correct 44 1.15.4.2 yamt * functioning of this software in any circumstances and is not liable for 45 1.15.4.2 yamt * any damages caused by this software. 46 1.15.4.2 yamt * 47 1.15.4.2 yamt * October 1992 48 1.15.4.2 yamt */ 49 1.15.4.2 yamt #if HAVE_NBTOOL_CONFIG_H 50 1.15.4.2 yamt #include "nbtool_config.h" 51 1.15.4.2 yamt #endif 52 1.15.4.2 yamt 53 1.15.4.2 yamt #include <sys/cdefs.h> 54 1.15.4.2 yamt __KERNEL_RCSID(0, "$NetBSD: msdosfs_vnops.c,v 1.15.4.2 2014/05/22 11:43:05 yamt Exp $"); 55 1.15.4.2 yamt 56 1.15.4.2 yamt #include <sys/param.h> 57 1.15.4.2 yamt #include <sys/mman.h> 58 1.15.4.2 yamt #include <fcntl.h> 59 1.15.4.2 yamt #include <unistd.h> 60 1.15.4.2 yamt 61 1.15.4.2 yamt #include <ffs/buf.h> 62 1.15.4.2 yamt 63 1.15.4.2 yamt #include <fs/msdosfs/bpb.h> 64 1.15.4.2 yamt #include <fs/msdosfs/direntry.h> 65 1.15.4.2 yamt #include <fs/msdosfs/denode.h> 66 1.15.4.2 yamt #include <fs/msdosfs/msdosfsmount.h> 67 1.15.4.2 yamt #include <fs/msdosfs/fat.h> 68 1.15.4.2 yamt 69 1.15.4.2 yamt #include "makefs.h" 70 1.15.4.2 yamt #include "msdos.h" 71 1.15.4.2 yamt 72 1.15.4.2 yamt #ifdef MSDOSFS_DEBUG 73 1.15.4.2 yamt #define DPRINTF(a) printf a 74 1.15.4.2 yamt #else 75 1.15.4.2 yamt #define DPRINTF(a) 76 1.15.4.2 yamt #endif 77 1.15.4.2 yamt /* 78 1.15.4.2 yamt * Some general notes: 79 1.15.4.2 yamt * 80 1.15.4.2 yamt * In the ufs filesystem the inodes, superblocks, and indirect blocks are 81 1.15.4.2 yamt * read/written using the vnode for the filesystem. Blocks that represent 82 1.15.4.2 yamt * the contents of a file are read/written using the vnode for the file 83 1.15.4.2 yamt * (including directories when they are read/written as files). This 84 1.15.4.2 yamt * presents problems for the dos filesystem because data that should be in 85 1.15.4.2 yamt * an inode (if dos had them) resides in the directory itself. Since we 86 1.15.4.2 yamt * must update directory entries without the benefit of having the vnode 87 1.15.4.2 yamt * for the directory we must use the vnode for the filesystem. This means 88 1.15.4.2 yamt * that when a directory is actually read/written (via read, write, or 89 1.15.4.2 yamt * readdir, or seek) we must use the vnode for the filesystem instead of 90 1.15.4.2 yamt * the vnode for the directory as would happen in ufs. This is to insure we 91 1.15.4.2 yamt * retrieve the correct block from the buffer cache since the hash value is 92 1.15.4.2 yamt * based upon the vnode address and the desired block number. 93 1.15.4.2 yamt */ 94 1.15.4.2 yamt 95 1.15.4.2 yamt static int msdosfs_wfile(const char *, struct denode *, fsnode *); 96 1.15.4.2 yamt 97 1.15.4.2 yamt static void 98 1.15.4.2 yamt msdosfs_times(struct msdosfsmount *pmp, struct denode *dep, 99 1.15.4.2 yamt const struct stat *st) 100 1.15.4.2 yamt { 101 1.15.4.2 yamt #ifndef HAVE_NBTOOL_CONFIG_H 102 1.15.4.2 yamt struct timespec at = st->st_atimespec; 103 1.15.4.2 yamt struct timespec mt = st->st_mtimespec; 104 1.15.4.2 yamt #else 105 1.15.4.2 yamt struct timespec at = { st->st_atime, 0 }; 106 1.15.4.2 yamt struct timespec mt = { st->st_mtime, 0 }; 107 1.15.4.2 yamt #endif 108 1.15.4.2 yamt unix2dostime(&at, pmp->pm_gmtoff, &dep->de_ADate, NULL, NULL); 109 1.15.4.2 yamt unix2dostime(&mt, pmp->pm_gmtoff, &dep->de_MDate, &dep->de_MTime, NULL); 110 1.15.4.2 yamt } 111 1.15.4.2 yamt 112 1.15.4.2 yamt /* 113 1.15.4.2 yamt * When we search a directory the blocks containing directory entries are 114 1.15.4.2 yamt * read and examined. The directory entries contain information that would 115 1.15.4.2 yamt * normally be in the inode of a unix filesystem. This means that some of 116 1.15.4.2 yamt * a directory's contents may also be in memory resident denodes (sort of 117 1.15.4.2 yamt * an inode). This can cause problems if we are searching while some other 118 1.15.4.2 yamt * process is modifying a directory. To prevent one process from accessing 119 1.15.4.2 yamt * incompletely modified directory information we depend upon being the 120 1.15.4.2 yamt * sole owner of a directory block. bread/brelse provide this service. 121 1.15.4.2 yamt * This being the case, when a process modifies a directory it must first 122 1.15.4.2 yamt * acquire the disk block that contains the directory entry to be modified. 123 1.15.4.2 yamt * Then update the disk block and the denode, and then write the disk block 124 1.15.4.2 yamt * out to disk. This way disk blocks containing directory entries and in 125 1.15.4.2 yamt * memory denode's will be in synch. 126 1.15.4.2 yamt */ 127 1.15.4.2 yamt static int 128 1.15.4.2 yamt msdosfs_findslot(struct denode *dp, struct componentname *cnp) 129 1.15.4.2 yamt { 130 1.15.4.2 yamt daddr_t bn; 131 1.15.4.2 yamt int error; 132 1.15.4.2 yamt int slotcount; 133 1.15.4.2 yamt int slotoffset = 0; 134 1.15.4.2 yamt int frcn; 135 1.15.4.2 yamt u_long cluster; 136 1.15.4.2 yamt int blkoff; 137 1.15.4.2 yamt u_int diroff; 138 1.15.4.2 yamt int blsize; 139 1.15.4.2 yamt struct msdosfsmount *pmp; 140 1.15.4.2 yamt struct buf *bp = 0; 141 1.15.4.2 yamt struct direntry *dep; 142 1.15.4.2 yamt u_char dosfilename[12]; 143 1.15.4.2 yamt int wincnt = 1; 144 1.15.4.2 yamt int chksum = -1, chksum_ok; 145 1.15.4.2 yamt int olddos = 1; 146 1.15.4.2 yamt 147 1.15.4.2 yamt pmp = dp->de_pmp; 148 1.15.4.2 yamt 149 1.15.4.2 yamt switch (unix2dosfn((const u_char *)cnp->cn_nameptr, dosfilename, 150 1.15.4.2 yamt cnp->cn_namelen, 0)) { 151 1.15.4.2 yamt case 0: 152 1.15.4.2 yamt return (EINVAL); 153 1.15.4.2 yamt case 1: 154 1.15.4.2 yamt break; 155 1.15.4.2 yamt case 2: 156 1.15.4.2 yamt wincnt = winSlotCnt((const u_char *)cnp->cn_nameptr, 157 1.15.4.2 yamt cnp->cn_namelen) + 1; 158 1.15.4.2 yamt break; 159 1.15.4.2 yamt case 3: 160 1.15.4.2 yamt olddos = 0; 161 1.15.4.2 yamt wincnt = winSlotCnt((const u_char *)cnp->cn_nameptr, 162 1.15.4.2 yamt cnp->cn_namelen) + 1; 163 1.15.4.2 yamt break; 164 1.15.4.2 yamt } 165 1.15.4.2 yamt 166 1.15.4.2 yamt if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) 167 1.15.4.2 yamt wincnt = 1; 168 1.15.4.2 yamt 169 1.15.4.2 yamt /* 170 1.15.4.2 yamt * Suppress search for slots unless creating 171 1.15.4.2 yamt * file and at end of pathname, in which case 172 1.15.4.2 yamt * we watch for a place to put the new file in 173 1.15.4.2 yamt * case it doesn't already exist. 174 1.15.4.2 yamt */ 175 1.15.4.2 yamt slotcount = 0; 176 1.15.4.2 yamt DPRINTF(("%s(): dos filename: %s\n", __func__, dosfilename)); 177 1.15.4.2 yamt /* 178 1.15.4.2 yamt * Search the directory pointed at by vdp for the name pointed at 179 1.15.4.2 yamt * by cnp->cn_nameptr. 180 1.15.4.2 yamt */ 181 1.15.4.2 yamt /* 182 1.15.4.2 yamt * The outer loop ranges over the clusters that make up the 183 1.15.4.2 yamt * directory. Note that the root directory is different from all 184 1.15.4.2 yamt * other directories. It has a fixed number of blocks that are not 185 1.15.4.2 yamt * part of the pool of allocatable clusters. So, we treat it a 186 1.15.4.2 yamt * little differently. The root directory starts at "cluster" 0. 187 1.15.4.2 yamt */ 188 1.15.4.2 yamt diroff = 0; 189 1.15.4.2 yamt for (frcn = 0; diroff < dp->de_FileSize; frcn++) { 190 1.15.4.2 yamt if ((error = pcbmap(dp, frcn, &bn, &cluster, &blsize)) != 0) { 191 1.15.4.2 yamt if (error == E2BIG) 192 1.15.4.2 yamt break; 193 1.15.4.2 yamt return (error); 194 1.15.4.2 yamt } 195 1.15.4.2 yamt error = bread(pmp->pm_devvp, de_bn2kb(pmp, bn), blsize, NOCRED, 196 1.15.4.2 yamt 0, &bp); 197 1.15.4.2 yamt if (error) { 198 1.15.4.2 yamt return (error); 199 1.15.4.2 yamt } 200 1.15.4.2 yamt for (blkoff = 0; blkoff < blsize; 201 1.15.4.2 yamt blkoff += sizeof(struct direntry), 202 1.15.4.2 yamt diroff += sizeof(struct direntry)) { 203 1.15.4.2 yamt dep = (struct direntry *)((char *)bp->b_data + blkoff); 204 1.15.4.2 yamt /* 205 1.15.4.2 yamt * If the slot is empty and we are still looking 206 1.15.4.2 yamt * for an empty then remember this one. If the 207 1.15.4.2 yamt * slot is not empty then check to see if it 208 1.15.4.2 yamt * matches what we are looking for. If the slot 209 1.15.4.2 yamt * has never been filled with anything, then the 210 1.15.4.2 yamt * remainder of the directory has never been used, 211 1.15.4.2 yamt * so there is no point in searching it. 212 1.15.4.2 yamt */ 213 1.15.4.2 yamt if (dep->deName[0] == SLOT_EMPTY || 214 1.15.4.2 yamt dep->deName[0] == SLOT_DELETED) { 215 1.15.4.2 yamt /* 216 1.15.4.2 yamt * Drop memory of previous long matches 217 1.15.4.2 yamt */ 218 1.15.4.2 yamt chksum = -1; 219 1.15.4.2 yamt 220 1.15.4.2 yamt if (slotcount < wincnt) { 221 1.15.4.2 yamt slotcount++; 222 1.15.4.2 yamt slotoffset = diroff; 223 1.15.4.2 yamt } 224 1.15.4.2 yamt if (dep->deName[0] == SLOT_EMPTY) { 225 1.15.4.2 yamt brelse(bp, 0); 226 1.15.4.2 yamt goto notfound; 227 1.15.4.2 yamt } 228 1.15.4.2 yamt } else { 229 1.15.4.2 yamt /* 230 1.15.4.2 yamt * If there wasn't enough space for our 231 1.15.4.2 yamt * winentries, forget about the empty space 232 1.15.4.2 yamt */ 233 1.15.4.2 yamt if (slotcount < wincnt) 234 1.15.4.2 yamt slotcount = 0; 235 1.15.4.2 yamt 236 1.15.4.2 yamt /* 237 1.15.4.2 yamt * Check for Win95 long filename entry 238 1.15.4.2 yamt */ 239 1.15.4.2 yamt if (dep->deAttributes == ATTR_WIN95) { 240 1.15.4.2 yamt if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) 241 1.15.4.2 yamt continue; 242 1.15.4.2 yamt 243 1.15.4.2 yamt chksum = winChkName((const u_char *)cnp->cn_nameptr, 244 1.15.4.2 yamt cnp->cn_namelen, 245 1.15.4.2 yamt (struct winentry *)dep, 246 1.15.4.2 yamt chksum); 247 1.15.4.2 yamt continue; 248 1.15.4.2 yamt } 249 1.15.4.2 yamt 250 1.15.4.2 yamt /* 251 1.15.4.2 yamt * Ignore volume labels (anywhere, not just 252 1.15.4.2 yamt * the root directory). 253 1.15.4.2 yamt */ 254 1.15.4.2 yamt if (dep->deAttributes & ATTR_VOLUME) { 255 1.15.4.2 yamt chksum = -1; 256 1.15.4.2 yamt continue; 257 1.15.4.2 yamt } 258 1.15.4.2 yamt 259 1.15.4.2 yamt /* 260 1.15.4.2 yamt * Check for a checksum or name match 261 1.15.4.2 yamt */ 262 1.15.4.2 yamt chksum_ok = (chksum == winChksum(dep->deName)); 263 1.15.4.2 yamt if (!chksum_ok 264 1.15.4.2 yamt && (!olddos || memcmp(dosfilename, dep->deName, 11))) { 265 1.15.4.2 yamt chksum = -1; 266 1.15.4.2 yamt continue; 267 1.15.4.2 yamt } 268 1.15.4.2 yamt DPRINTF(("%s(): match blkoff %d, diroff %d\n", 269 1.15.4.2 yamt __func__, blkoff, diroff)); 270 1.15.4.2 yamt /* 271 1.15.4.2 yamt * Remember where this directory 272 1.15.4.2 yamt * entry came from for whoever did 273 1.15.4.2 yamt * this lookup. 274 1.15.4.2 yamt */ 275 1.15.4.2 yamt dp->de_fndoffset = diroff; 276 1.15.4.2 yamt dp->de_fndcnt = 0; 277 1.15.4.2 yamt 278 1.15.4.2 yamt return EEXIST; 279 1.15.4.2 yamt } 280 1.15.4.2 yamt } /* for (blkoff = 0; .... */ 281 1.15.4.2 yamt /* 282 1.15.4.2 yamt * Release the buffer holding the directory cluster just 283 1.15.4.2 yamt * searched. 284 1.15.4.2 yamt */ 285 1.15.4.2 yamt brelse(bp, 0); 286 1.15.4.2 yamt } /* for (frcn = 0; ; frcn++) */ 287 1.15.4.2 yamt 288 1.15.4.2 yamt notfound: 289 1.15.4.2 yamt /* 290 1.15.4.2 yamt * We hold no disk buffers at this point. 291 1.15.4.2 yamt */ 292 1.15.4.2 yamt 293 1.15.4.2 yamt /* 294 1.15.4.2 yamt * If we get here we didn't find the entry we were looking for. But 295 1.15.4.2 yamt * that's ok if we are creating or renaming and are at the end of 296 1.15.4.2 yamt * the pathname and the directory hasn't been removed. 297 1.15.4.2 yamt */ 298 1.15.4.2 yamt DPRINTF(("%s(): refcnt %ld, slotcount %d, slotoffset %d\n", 299 1.15.4.2 yamt __func__, dp->de_refcnt, slotcount, slotoffset)); 300 1.15.4.2 yamt /* 301 1.15.4.2 yamt * Fixup the slot description to point to the place where 302 1.15.4.2 yamt * we might put the new DOS direntry (putting the Win95 303 1.15.4.2 yamt * long name entries before that) 304 1.15.4.2 yamt */ 305 1.15.4.2 yamt if (!slotcount) { 306 1.15.4.2 yamt slotcount = 1; 307 1.15.4.2 yamt slotoffset = diroff; 308 1.15.4.2 yamt } 309 1.15.4.2 yamt if (wincnt > slotcount) { 310 1.15.4.2 yamt slotoffset += sizeof(struct direntry) * (wincnt - slotcount); 311 1.15.4.2 yamt } 312 1.15.4.2 yamt 313 1.15.4.2 yamt /* 314 1.15.4.2 yamt * Return an indication of where the new directory 315 1.15.4.2 yamt * entry should be put. 316 1.15.4.2 yamt */ 317 1.15.4.2 yamt dp->de_fndoffset = slotoffset; 318 1.15.4.2 yamt dp->de_fndcnt = wincnt - 1; 319 1.15.4.2 yamt 320 1.15.4.2 yamt /* 321 1.15.4.2 yamt * We return with the directory locked, so that 322 1.15.4.2 yamt * the parameters we set up above will still be 323 1.15.4.2 yamt * valid if we actually decide to do a direnter(). 324 1.15.4.2 yamt * We return ni_vp == NULL to indicate that the entry 325 1.15.4.2 yamt * does not currently exist; we leave a pointer to 326 1.15.4.2 yamt * the (locked) directory inode in ndp->ni_dvp. 327 1.15.4.2 yamt * 328 1.15.4.2 yamt * NB - if the directory is unlocked, then this 329 1.15.4.2 yamt * information cannot be used. 330 1.15.4.2 yamt */ 331 1.15.4.2 yamt return 0; 332 1.15.4.2 yamt } 333 1.15.4.2 yamt 334 1.15.4.2 yamt /* 335 1.15.4.2 yamt * Create a regular file. On entry the directory to contain the file being 336 1.15.4.2 yamt * created is locked. We must release before we return. 337 1.15.4.2 yamt */ 338 1.15.4.2 yamt struct denode * 339 1.15.4.2 yamt msdosfs_mkfile(const char *path, struct denode *pdep, fsnode *node) 340 1.15.4.2 yamt { 341 1.15.4.2 yamt struct componentname cn; 342 1.15.4.2 yamt struct denode ndirent; 343 1.15.4.2 yamt struct denode *dep; 344 1.15.4.2 yamt int error; 345 1.15.4.2 yamt struct stat *st = &node->inode->st; 346 1.15.4.2 yamt struct msdosfsmount *pmp = pdep->de_pmp; 347 1.15.4.2 yamt 348 1.15.4.2 yamt cn.cn_nameptr = node->name; 349 1.15.4.2 yamt cn.cn_namelen = strlen(node->name); 350 1.15.4.2 yamt 351 1.15.4.2 yamt DPRINTF(("%s(name %s, mode 0%o size %zu)\n", __func__, node->name, 352 1.15.4.2 yamt st->st_mode, (size_t)st->st_size)); 353 1.15.4.2 yamt 354 1.15.4.2 yamt /* 355 1.15.4.2 yamt * If this is the root directory and there is no space left we 356 1.15.4.2 yamt * can't do anything. This is because the root directory can not 357 1.15.4.2 yamt * change size. 358 1.15.4.2 yamt */ 359 1.15.4.2 yamt if (pdep->de_StartCluster == MSDOSFSROOT 360 1.15.4.2 yamt && pdep->de_fndoffset >= pdep->de_FileSize) { 361 1.15.4.2 yamt error = ENOSPC; 362 1.15.4.2 yamt goto bad; 363 1.15.4.2 yamt } 364 1.15.4.2 yamt 365 1.15.4.2 yamt /* 366 1.15.4.2 yamt * Create a directory entry for the file, then call createde() to 367 1.15.4.2 yamt * have it installed. NOTE: DOS files are always executable. We 368 1.15.4.2 yamt * use the absence of the owner write bit to make the file 369 1.15.4.2 yamt * readonly. 370 1.15.4.2 yamt */ 371 1.15.4.2 yamt memset(&ndirent, 0, sizeof(ndirent)); 372 1.15.4.2 yamt if ((error = uniqdosname(pdep, &cn, ndirent.de_Name)) != 0) 373 1.15.4.2 yamt goto bad; 374 1.15.4.2 yamt 375 1.15.4.2 yamt ndirent.de_Attributes = (st->st_mode & S_IWUSR) ? 376 1.15.4.2 yamt ATTR_ARCHIVE : ATTR_ARCHIVE | ATTR_READONLY; 377 1.15.4.2 yamt ndirent.de_StartCluster = 0; 378 1.15.4.2 yamt ndirent.de_FileSize = 0; 379 1.15.4.2 yamt ndirent.de_dev = pdep->de_dev; 380 1.15.4.2 yamt ndirent.de_devvp = pdep->de_devvp; 381 1.15.4.2 yamt ndirent.de_pmp = pdep->de_pmp; 382 1.15.4.2 yamt ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 383 1.15.4.2 yamt msdosfs_times(pmp, &ndirent, st); 384 1.15.4.2 yamt if ((error = msdosfs_findslot(pdep, &cn)) != 0) 385 1.15.4.2 yamt goto bad; 386 1.15.4.2 yamt if ((error = createde(&ndirent, pdep, &dep, &cn)) != 0) 387 1.15.4.2 yamt goto bad; 388 1.15.4.2 yamt if ((error = msdosfs_wfile(path, dep, node)) != 0) 389 1.15.4.2 yamt goto bad; 390 1.15.4.2 yamt return dep; 391 1.15.4.2 yamt 392 1.15.4.2 yamt bad: 393 1.15.4.2 yamt errno = error; 394 1.15.4.2 yamt return NULL; 395 1.15.4.2 yamt } 396 1.15.4.2 yamt static int 397 1.15.4.2 yamt msdosfs_updatede(struct denode *dep) 398 1.15.4.2 yamt { 399 1.15.4.2 yamt struct buf *bp; 400 1.15.4.2 yamt struct direntry *dirp; 401 1.15.4.2 yamt int error; 402 1.15.4.2 yamt 403 1.15.4.2 yamt dep->de_flag &= ~DE_MODIFIED; 404 1.15.4.2 yamt error = readde(dep, &bp, &dirp); 405 1.15.4.2 yamt if (error) 406 1.15.4.2 yamt return error; 407 1.15.4.2 yamt DE_EXTERNALIZE(dirp, dep); 408 1.15.4.2 yamt error = bwrite(bp); 409 1.15.4.2 yamt return error; 410 1.15.4.2 yamt } 411 1.15.4.2 yamt 412 1.15.4.2 yamt /* 413 1.15.4.2 yamt * Write data to a file or directory. 414 1.15.4.2 yamt */ 415 1.15.4.2 yamt static int 416 1.15.4.2 yamt msdosfs_wfile(const char *path, struct denode *dep, fsnode *node) 417 1.15.4.2 yamt { 418 1.15.4.2 yamt int error, fd; 419 1.15.4.2 yamt size_t osize = dep->de_FileSize; 420 1.15.4.2 yamt struct stat *st = &node->inode->st; 421 1.15.4.2 yamt size_t nsize, offs; 422 1.15.4.2 yamt struct msdosfsmount *pmp = dep->de_pmp; 423 1.15.4.2 yamt struct buf *bp; 424 1.15.4.2 yamt char *dat; 425 1.15.4.2 yamt u_long cn = 0; 426 1.15.4.2 yamt 427 1.15.4.2 yamt error = 0; /* XXX: gcc/vax */ 428 1.15.4.2 yamt DPRINTF(("%s(diroff %lu, dirclust %lu, startcluster %lu)\n", __func__, 429 1.15.4.2 yamt dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster)); 430 1.15.4.2 yamt if (st->st_size == 0) 431 1.15.4.2 yamt return 0; 432 1.15.4.2 yamt 433 1.15.4.2 yamt /* Don't bother to try to write files larger than the fs limit */ 434 1.15.4.2 yamt if (st->st_size > MSDOSFS_FILESIZE_MAX) { 435 1.15.4.2 yamt errno = EFBIG; 436 1.15.4.2 yamt return -1; 437 1.15.4.2 yamt } 438 1.15.4.2 yamt 439 1.15.4.2 yamt nsize = st->st_size; 440 1.15.4.2 yamt DPRINTF(("%s(nsize=%zu, osize=%zu)\n", __func__, nsize, osize)); 441 1.15.4.2 yamt if (nsize > osize) { 442 1.15.4.2 yamt if ((error = deextend(dep, nsize, NULL)) != 0) { 443 1.15.4.2 yamt errno = error; 444 1.15.4.2 yamt return -1; 445 1.15.4.2 yamt } 446 1.15.4.2 yamt if ((error = msdosfs_updatede(dep)) != 0) { 447 1.15.4.2 yamt errno = error; 448 1.15.4.2 yamt return -1; 449 1.15.4.2 yamt } 450 1.15.4.2 yamt } 451 1.15.4.2 yamt 452 1.15.4.2 yamt if ((fd = open(path, O_RDONLY)) == -1) 453 1.15.4.2 yamt err(1, "open %s", path); 454 1.15.4.2 yamt 455 1.15.4.2 yamt if ((dat = mmap(0, nsize, PROT_READ, MAP_FILE | MAP_PRIVATE, fd, 0)) 456 1.15.4.2 yamt == MAP_FAILED) { 457 1.15.4.2 yamt DPRINTF(("%s: mmap %s %s", __func__, node->name, 458 1.15.4.2 yamt strerror(errno))); 459 1.15.4.2 yamt close(fd); 460 1.15.4.2 yamt goto out; 461 1.15.4.2 yamt } 462 1.15.4.2 yamt close(fd); 463 1.15.4.2 yamt 464 1.15.4.2 yamt for (offs = 0; offs < nsize;) { 465 1.15.4.2 yamt int blsize, cpsize; 466 1.15.4.2 yamt daddr_t bn; 467 1.15.4.2 yamt u_long on = offs & pmp->pm_crbomask; 468 1.15.4.2 yamt #ifdef HACK 469 1.15.4.2 yamt cn = dep->de_StartCluster; 470 1.15.4.2 yamt if (cn == MSDOSFSROOT) { 471 1.15.4.2 yamt DPRINTF(("%s: bad lbn %lu", __func__, cn)); 472 1.15.4.2 yamt goto out; 473 1.15.4.2 yamt } 474 1.15.4.2 yamt bn = cntobn(pmp, cn); 475 1.15.4.2 yamt blsize = pmp->pm_bpcluster; 476 1.15.4.2 yamt #else 477 1.15.4.2 yamt if ((error = pcbmap(dep, cn++, &bn, NULL, &blsize)) != 0) { 478 1.15.4.2 yamt DPRINTF(("%s: pcbmap %lu", __func__, bn)); 479 1.15.4.2 yamt goto out; 480 1.15.4.2 yamt } 481 1.15.4.2 yamt #endif 482 1.15.4.2 yamt DPRINTF(("%s(cn=%lu, bn=%llu/%llu, blsize=%d)\n", __func__, 483 1.15.4.2 yamt cn, (unsigned long long)bn, 484 1.15.4.2 yamt (unsigned long long)de_bn2kb(pmp, bn), blsize)); 485 1.15.4.2 yamt if ((error = bread(pmp->pm_devvp, de_bn2kb(pmp, bn), blsize, 486 1.15.4.2 yamt NULL, 0, &bp)) != 0) { 487 1.15.4.2 yamt DPRINTF(("bread %d\n", error)); 488 1.15.4.2 yamt goto out; 489 1.15.4.2 yamt } 490 1.15.4.2 yamt cpsize = MIN((nsize - offs), blsize - on); 491 1.15.4.2 yamt memcpy((char *)bp->b_data + on, dat + offs, cpsize); 492 1.15.4.2 yamt bwrite(bp); 493 1.15.4.2 yamt offs += cpsize; 494 1.15.4.2 yamt } 495 1.15.4.2 yamt 496 1.15.4.2 yamt munmap(dat, nsize); 497 1.15.4.2 yamt return 0; 498 1.15.4.2 yamt out: 499 1.15.4.2 yamt munmap(dat, nsize); 500 1.15.4.2 yamt return error; 501 1.15.4.2 yamt } 502 1.15.4.2 yamt 503 1.15.4.2 yamt 504 1.15.4.2 yamt static const struct { 505 1.15.4.2 yamt struct direntry dot; 506 1.15.4.2 yamt struct direntry dotdot; 507 1.15.4.2 yamt } dosdirtemplate = { 508 1.15.4.2 yamt { ". ", " ", /* the . entry */ 509 1.15.4.2 yamt ATTR_DIRECTORY, /* file attribute */ 510 1.15.4.2 yamt 0, /* reserved */ 511 1.15.4.2 yamt 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 512 1.15.4.2 yamt { 0, 0 }, /* access date */ 513 1.15.4.2 yamt { 0, 0 }, /* high bits of start cluster */ 514 1.15.4.2 yamt { 210, 4 }, { 210, 4 }, /* modify time & date */ 515 1.15.4.2 yamt { 0, 0 }, /* startcluster */ 516 1.15.4.2 yamt { 0, 0, 0, 0 } /* filesize */ 517 1.15.4.2 yamt }, 518 1.15.4.2 yamt { ".. ", " ", /* the .. entry */ 519 1.15.4.2 yamt ATTR_DIRECTORY, /* file attribute */ 520 1.15.4.2 yamt 0, /* reserved */ 521 1.15.4.2 yamt 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 522 1.15.4.2 yamt { 0, 0 }, /* access date */ 523 1.15.4.2 yamt { 0, 0 }, /* high bits of start cluster */ 524 1.15.4.2 yamt { 210, 4 }, { 210, 4 }, /* modify time & date */ 525 1.15.4.2 yamt { 0, 0 }, /* startcluster */ 526 1.15.4.2 yamt { 0, 0, 0, 0 } /* filesize */ 527 1.15.4.2 yamt } 528 1.15.4.2 yamt }; 529 1.15.4.2 yamt 530 1.15.4.2 yamt struct denode * 531 1.15.4.2 yamt msdosfs_mkdire(const char *path, struct denode *pdep, fsnode *node) { 532 1.15.4.2 yamt struct denode ndirent; 533 1.15.4.2 yamt struct denode *dep; 534 1.15.4.2 yamt struct componentname cn; 535 1.15.4.2 yamt struct stat *st = &node->inode->st; 536 1.15.4.2 yamt struct msdosfsmount *pmp = pdep->de_pmp; 537 1.15.4.2 yamt int error; 538 1.15.4.2 yamt u_long newcluster, pcl, bn; 539 1.15.4.2 yamt daddr_t lbn; 540 1.15.4.2 yamt struct direntry *denp; 541 1.15.4.2 yamt struct buf *bp; 542 1.15.4.2 yamt 543 1.15.4.2 yamt cn.cn_nameptr = node->name; 544 1.15.4.2 yamt cn.cn_namelen = strlen(node->name); 545 1.15.4.2 yamt /* 546 1.15.4.2 yamt * If this is the root directory and there is no space left we 547 1.15.4.2 yamt * can't do anything. This is because the root directory can not 548 1.15.4.2 yamt * change size. 549 1.15.4.2 yamt */ 550 1.15.4.2 yamt if (pdep->de_StartCluster == MSDOSFSROOT 551 1.15.4.2 yamt && pdep->de_fndoffset >= pdep->de_FileSize) { 552 1.15.4.2 yamt error = ENOSPC; 553 1.15.4.2 yamt goto bad2; 554 1.15.4.2 yamt } 555 1.15.4.2 yamt 556 1.15.4.2 yamt /* 557 1.15.4.2 yamt * Allocate a cluster to hold the about to be created directory. 558 1.15.4.2 yamt */ 559 1.15.4.2 yamt error = clusteralloc(pmp, 0, 1, &newcluster, NULL); 560 1.15.4.2 yamt if (error) 561 1.15.4.2 yamt goto bad2; 562 1.15.4.2 yamt 563 1.15.4.2 yamt memset(&ndirent, 0, sizeof(ndirent)); 564 1.15.4.2 yamt ndirent.de_pmp = pmp; 565 1.15.4.2 yamt ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 566 1.15.4.2 yamt msdosfs_times(pmp, &ndirent, st); 567 1.15.4.2 yamt 568 1.15.4.2 yamt /* 569 1.15.4.2 yamt * Now fill the cluster with the "." and ".." entries. And write 570 1.15.4.2 yamt * the cluster to disk. This way it is there for the parent 571 1.15.4.2 yamt * directory to be pointing at if there were a crash. 572 1.15.4.2 yamt */ 573 1.15.4.2 yamt bn = cntobn(pmp, newcluster); 574 1.15.4.2 yamt lbn = de_bn2kb(pmp, bn); 575 1.15.4.2 yamt DPRINTF(("%s(newcluster %lu, bn=%lu, lbn=%lu)\n", __func__, newcluster, 576 1.15.4.2 yamt bn, lbn)); 577 1.15.4.2 yamt /* always succeeds */ 578 1.15.4.2 yamt bp = getblk(pmp->pm_devvp, lbn, pmp->pm_bpcluster, 0, 0); 579 1.15.4.2 yamt memset(bp->b_data, 0, pmp->pm_bpcluster); 580 1.15.4.2 yamt memcpy(bp->b_data, &dosdirtemplate, sizeof dosdirtemplate); 581 1.15.4.2 yamt denp = (struct direntry *)bp->b_data; 582 1.15.4.2 yamt putushort(denp[0].deStartCluster, newcluster); 583 1.15.4.2 yamt putushort(denp[0].deCDate, ndirent.de_CDate); 584 1.15.4.2 yamt putushort(denp[0].deCTime, ndirent.de_CTime); 585 1.15.4.2 yamt denp[0].deCHundredth = ndirent.de_CHun; 586 1.15.4.2 yamt putushort(denp[0].deADate, ndirent.de_ADate); 587 1.15.4.2 yamt putushort(denp[0].deMDate, ndirent.de_MDate); 588 1.15.4.2 yamt putushort(denp[0].deMTime, ndirent.de_MTime); 589 1.15.4.2 yamt pcl = pdep->de_StartCluster; 590 1.15.4.2 yamt DPRINTF(("%s(pcl %lu, rootdirblk=%lu)\n", __func__, pcl, 591 1.15.4.2 yamt pmp->pm_rootdirblk)); 592 1.15.4.2 yamt if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 593 1.15.4.2 yamt pcl = 0; 594 1.15.4.2 yamt putushort(denp[1].deStartCluster, pcl); 595 1.15.4.2 yamt putushort(denp[1].deCDate, ndirent.de_CDate); 596 1.15.4.2 yamt putushort(denp[1].deCTime, ndirent.de_CTime); 597 1.15.4.2 yamt denp[1].deCHundredth = ndirent.de_CHun; 598 1.15.4.2 yamt putushort(denp[1].deADate, ndirent.de_ADate); 599 1.15.4.2 yamt putushort(denp[1].deMDate, ndirent.de_MDate); 600 1.15.4.2 yamt putushort(denp[1].deMTime, ndirent.de_MTime); 601 1.15.4.2 yamt if (FAT32(pmp)) { 602 1.15.4.2 yamt putushort(denp[0].deHighClust, newcluster >> 16); 603 1.15.4.2 yamt putushort(denp[1].deHighClust, pdep->de_StartCluster >> 16); 604 1.15.4.2 yamt } else { 605 1.15.4.2 yamt putushort(denp[0].deHighClust, 0); 606 1.15.4.2 yamt putushort(denp[1].deHighClust, 0); 607 1.15.4.2 yamt } 608 1.15.4.2 yamt 609 1.15.4.2 yamt if ((error = bwrite(bp)) != 0) 610 1.15.4.2 yamt goto bad; 611 1.15.4.2 yamt 612 1.15.4.2 yamt /* 613 1.15.4.2 yamt * Now build up a directory entry pointing to the newly allocated 614 1.15.4.2 yamt * cluster. This will be written to an empty slot in the parent 615 1.15.4.2 yamt * directory. 616 1.15.4.2 yamt */ 617 1.15.4.2 yamt if ((error = uniqdosname(pdep, &cn, ndirent.de_Name)) != 0) 618 1.15.4.2 yamt goto bad; 619 1.15.4.2 yamt 620 1.15.4.2 yamt ndirent.de_Attributes = ATTR_DIRECTORY; 621 1.15.4.2 yamt ndirent.de_StartCluster = newcluster; 622 1.15.4.2 yamt ndirent.de_FileSize = 0; 623 1.15.4.2 yamt ndirent.de_dev = pdep->de_dev; 624 1.15.4.2 yamt ndirent.de_devvp = pdep->de_devvp; 625 1.15.4.2 yamt ndirent.de_pmp = pdep->de_pmp; 626 1.15.4.2 yamt if ((error = msdosfs_findslot(pdep, &cn)) != 0) 627 1.15.4.2 yamt goto bad; 628 1.15.4.2 yamt if ((error = createde(&ndirent, pdep, &dep, &cn)) != 0) 629 1.15.4.2 yamt goto bad; 630 1.15.4.2 yamt if ((error = msdosfs_updatede(dep)) != 0) 631 1.15.4.2 yamt goto bad; 632 1.15.4.2 yamt return dep; 633 1.15.4.2 yamt 634 1.15.4.2 yamt bad: 635 1.15.4.2 yamt clusterfree(pmp, newcluster, NULL); 636 1.15.4.2 yamt bad2: 637 1.15.4.2 yamt errno = error; 638 1.15.4.2 yamt return NULL; 639 1.15.4.2 yamt } 640
Indexes created Wed Oct 22 13:09:56 GMT 2025