| File: | src/usr.sbin/makefs/msdos/msdosfs_lookup.c |
| Warning: | line 230, column 14 Although the value stored to 'rberror' is used in the enclosing expression, the value is never actually read from 'rberror' |
Press '?' to see keyboard shortcuts
Keyboard shortcuts:
| 1 | /* $OpenBSD: msdosfs_lookup.c,v 1.4 2021/10/06 00:40:41 deraadt Exp $ */ |
| 2 | /* $NetBSD: msdosfs_lookup.c,v 1.35 2016/01/30 09:59:27 mlelstv Exp $ */ |
| 3 | |
| 4 | /*- |
| 5 | * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. |
| 6 | * Copyright (C) 1994, 1995, 1997 TooLs GmbH. |
| 7 | * All rights reserved. |
| 8 | * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). |
| 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or without |
| 11 | * modification, are permitted provided that the following conditions |
| 12 | * are met: |
| 13 | * 1. Redistributions of source code must retain the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer. |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer in the |
| 17 | * documentation and/or other materials provided with the distribution. |
| 18 | * 3. All advertising materials mentioning features or use of this software |
| 19 | * must display the following acknowledgement: |
| 20 | * This product includes software developed by TooLs GmbH. |
| 21 | * 4. The name of TooLs GmbH may not be used to endorse or promote products |
| 22 | * derived from this software without specific prior written permission. |
| 23 | * |
| 24 | * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR |
| 25 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 26 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 27 | * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 28 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 29 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
| 30 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| 31 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
| 32 | * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
| 33 | * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 34 | */ |
| 35 | /* |
| 36 | * Written by Paul Popelka (paulp@uts.amdahl.com) |
| 37 | * |
| 38 | * You can do anything you want with this software, just don't say you wrote |
| 39 | * it, and don't remove this notice. |
| 40 | * |
| 41 | * This software is provided "as is". |
| 42 | * |
| 43 | * The author supplies this software to be publicly redistributed on the |
| 44 | * understanding that the author is not responsible for the correct |
| 45 | * functioning of this software in any circumstances and is not liable for |
| 46 | * any damages caused by this software. |
| 47 | * |
| 48 | * October 1992 |
| 49 | */ |
| 50 | |
| 51 | |
| 52 | #include "ffs/buf.h" |
| 53 | |
| 54 | #include <msdosfs/bpb.h> |
| 55 | #include "msdos/direntry.h" |
| 56 | #include "msdos/denode.h" |
| 57 | #include "msdos/msdosfsmount.h" |
| 58 | #include "msdos/fat.h" |
| 59 | |
| 60 | |
| 61 | |
| 62 | /* |
| 63 | * dep - directory entry to copy into the directory |
| 64 | * ddep - directory to add to |
| 65 | * depp - return the address of the denode for the created directory entry |
| 66 | * if depp != 0 |
| 67 | * cnp - componentname needed for Win95 long filenames |
| 68 | */ |
| 69 | int |
| 70 | createde(struct denode *dep, struct denode *ddep, struct denode **depp, struct componentname *cnp) |
| 71 | { |
| 72 | int error, rberror; |
| 73 | u_long dirclust, clusoffset; |
| 74 | u_long fndoffset, havecnt = 0, wcnt = 1, i; |
| 75 | struct direntry *ndep; |
| 76 | struct msdosfsmount *pmp = ddep->de_pmp; |
| 77 | struct mkfsbuf *bp; |
| 78 | daddr_t bn; |
| 79 | int blsize; |
| 80 | #define async0 0 |
| 81 | |
| 82 | #ifdef MSDOSFS_DEBUG |
| 83 | printf("createde(dep %p, ddep %p, depp %p, cnp %p)\n", |
| 84 | dep, ddep, depp, cnp); |
| 85 | #endif |
| 86 | |
| 87 | /* |
| 88 | * If no space left in the directory then allocate another cluster |
| 89 | * and chain it onto the end of the file. There is one exception |
| 90 | * to this. That is, if the root directory has no more space it |
| 91 | * can NOT be expanded. extendfile() checks for and fails attempts |
| 92 | * to extend the root directory. We just return an error in that |
| 93 | * case. |
| 94 | */ |
| 95 | if (ddep->de_fndoffset >= ddep->de_FileSize) { |
| 96 | u_long needlen = ddep->de_fndoffset + sizeof(struct direntry) |
| 97 | - ddep->de_FileSize; |
| 98 | dirclust = de_clcount(pmp, needlen)(((needlen) + (pmp)->pm_bpcluster - 1) >> (pmp)-> pm_cnshift); |
| 99 | if ((error = extendfile(ddep, dirclust, 0, 0, DE_CLEAR1)) != 0) { |
| 100 | (void)detrunc(ddep, ddep->de_FileSize, 0); |
| 101 | goto err_norollback; |
| 102 | } |
| 103 | |
| 104 | /* |
| 105 | * Update the size of the directory |
| 106 | */ |
| 107 | ddep->de_FileSize += de_cn2off(pmp, dirclust)((dirclust) << (pmp)->pm_cnshift); |
| 108 | } |
| 109 | |
| 110 | /* |
| 111 | * We just read in the cluster with space. Copy the new directory |
| 112 | * entry in. Then write it to disk. NOTE: DOS directories |
| 113 | * do not get smaller as clusters are emptied. |
| 114 | */ |
| 115 | error = pcbmap(ddep, de_cluster(pmp, ddep->de_fndoffset)((ddep->de_fndoffset) >> (pmp)->pm_cnshift), |
| 116 | &bn, &dirclust, &blsize); |
| 117 | if (error) |
| 118 | goto err_norollback; |
| 119 | clusoffset = ddep->de_fndoffset; |
| 120 | if (dirclust != MSDOSFSROOT0) |
| 121 | clusoffset &= pmp->pm_crbomask; |
| 122 | if ((error = bread(pmp->pm_devvp, de_bn2kb(pmp, bn)((bn) << ((pmp)->pm_bnshift - 9)), blsize, |
| 123 | B_MODIFY0, &bp)) != 0) { |
| 124 | goto err_norollback; |
| 125 | } |
| 126 | ndep = bptoep(pmp, bp, clusoffset)((struct direntry *)(((char *)(bp)->b_data) + ((clusoffset ) & (pmp)->pm_crbomask))); |
| 127 | |
| 128 | DE_EXTERNALIZE(ndep, dep)(memcpy((ndep)->deName, (dep)->de_Name, 11), (ndep)-> deAttributes = (dep)->de_Attributes, (ndep)->deCTimeHundredth = (dep)->de_CHun, (*((u_int16_t *)((ndep)->deCTime)) = ((dep)->de_CTime)), (*((u_int16_t *)((ndep)->deCDate)) = ((dep)->de_CDate)), (*((u_int16_t *)((ndep)->deADate )) = ((dep)->de_ADate)), (*((u_int16_t *)((ndep)->deMTime )) = ((dep)->de_MTime)), (*((u_int16_t *)((ndep)->deMDate )) = ((dep)->de_MDate)), (*((u_int16_t *)((ndep)->deStartCluster )) = ((dep)->de_StartCluster)), (*((u_int32_t *)((ndep)-> deFileSize)) = (((dep)->de_Attributes & 0x10) ? 0 : (dep )->de_FileSize)), (((dep)->de_pmp->pm_fatmask == 0x0fffffff ) ? (*((u_int16_t *)(((ndep))->deHighClust)) = (((dep))-> de_StartCluster >> 16)) : (*((u_int16_t *)(((ndep))-> deHighClust)) = (0)))); |
| 129 | |
| 130 | /* |
| 131 | * Now write the Win95 long name |
| 132 | */ |
| 133 | if (ddep->de_fndcnt > 0) { |
| 134 | u_int8_t chksum = winChksum(ndep->deName); |
| 135 | u_char *un = cnp->cn_nameptr; |
| 136 | int unlen = cnp->cn_namelen; |
| 137 | u_long xhavecnt; |
| 138 | |
| 139 | fndoffset = ddep->de_fndoffset; |
| 140 | xhavecnt = ddep->de_fndcnt + 1; |
| 141 | |
| 142 | for(; wcnt < xhavecnt; wcnt++) { |
| 143 | if ((fndoffset & pmp->pm_crbomask) == 0) { |
| 144 | /* we should never get here if ddep is root |
| 145 | * directory */ |
| 146 | |
| 147 | if (async0) |
| 148 | (void) bdwrite(bp)bwrite(bp); |
| 149 | else if ((error = bwrite(bp)) != 0) |
| 150 | goto rollback; |
| 151 | |
| 152 | fndoffset -= sizeof(struct direntry); |
| 153 | error = pcbmap(ddep, |
| 154 | de_cluster(pmp, fndoffset)((fndoffset) >> (pmp)->pm_cnshift), |
| 155 | &bn, 0, &blsize); |
| 156 | if (error) |
| 157 | goto rollback; |
| 158 | |
| 159 | error = bread(pmp->pm_devvp, de_bn2kb(pmp, bn)((bn) << ((pmp)->pm_bnshift - 9)), |
| 160 | blsize, B_MODIFY0, &bp); |
| 161 | if (error) { |
| 162 | goto rollback; |
| 163 | } |
| 164 | ndep = bptoep(pmp, bp,((struct direntry *)(((char *)(bp)->b_data) + ((fndoffset & pmp->pm_crbomask) & (pmp)->pm_crbomask))) |
| 165 | fndoffset & pmp->pm_crbomask)((struct direntry *)(((char *)(bp)->b_data) + ((fndoffset & pmp->pm_crbomask) & (pmp)->pm_crbomask))); |
| 166 | } else { |
| 167 | ndep--; |
| 168 | fndoffset -= sizeof(struct direntry); |
| 169 | } |
| 170 | if (!unix2winfn(un, unlen, (struct winentry *)ndep, |
| 171 | wcnt, chksum)) |
| 172 | break; |
| 173 | } |
| 174 | } |
| 175 | |
| 176 | if (async0) |
| 177 | bdwrite(bp)bwrite(bp); |
| 178 | else if ((error = bwrite(bp)) != 0) |
| 179 | goto rollback; |
| 180 | |
| 181 | /* |
| 182 | * If they want us to return with the denode gotten. |
| 183 | */ |
| 184 | if (depp) { |
| 185 | u_long diroffset = clusoffset; |
| 186 | |
| 187 | if (dep->de_Attributes & ATTR_DIRECTORY0x10) { |
| 188 | dirclust = dep->de_StartCluster; |
| 189 | if (FAT32(pmp)(pmp->pm_fatmask == 0x0fffffff) && dirclust == pmp->pm_rootdirblk) |
| 190 | dirclust = MSDOSFSROOT0; |
| 191 | if (dirclust == MSDOSFSROOT0) |
| 192 | diroffset = MSDOSFSROOT_OFS0x1fffffff; |
| 193 | else |
| 194 | diroffset = 0; |
| 195 | } |
| 196 | error = deget(pmp, dirclust, diroffset, depp); |
| 197 | return error; |
| 198 | } |
| 199 | |
| 200 | return 0; |
| 201 | |
| 202 | rollback: |
| 203 | /* |
| 204 | * Mark all slots modified so far as deleted. Note that we |
| 205 | * can't just call removede(), since directory is not in |
| 206 | * consistent state. |
| 207 | */ |
| 208 | fndoffset = ddep->de_fndoffset; |
| 209 | rberror = pcbmap(ddep, de_cluster(pmp, fndoffset)((fndoffset) >> (pmp)->pm_cnshift), |
| 210 | &bn, NULL((void*)0), &blsize); |
| 211 | if (rberror) |
| 212 | goto err_norollback; |
| 213 | if ((rberror = bread(pmp->pm_devvp, de_bn2kb(pmp, bn)((bn) << ((pmp)->pm_bnshift - 9)), blsize, |
| 214 | B_MODIFY0, &bp)) != 0) { |
| 215 | goto err_norollback; |
| 216 | } |
| 217 | ndep = bptoep(pmp, bp, clusoffset)((struct direntry *)(((char *)(bp)->b_data) + ((clusoffset ) & (pmp)->pm_crbomask))); |
| 218 | |
| 219 | havecnt = ddep->de_fndcnt + 1; |
| 220 | for(i = wcnt; i <= havecnt; i++) { |
| 221 | /* mark entry as deleted */ |
| 222 | ndep->deName[0] = SLOT_DELETED0xe5; |
| 223 | |
| 224 | if ((fndoffset & pmp->pm_crbomask) == 0) { |
| 225 | /* we should never get here if ddep is root |
| 226 | * directory */ |
| 227 | |
| 228 | if (async0) |
| 229 | bdwrite(bp)bwrite(bp); |
| 230 | else if ((rberror = bwrite(bp)) != 0) |
Although the value stored to 'rberror' is used in the enclosing expression, the value is never actually read from 'rberror' | |
| 231 | goto err_norollback; |
| 232 | |
| 233 | fndoffset -= sizeof(struct direntry); |
| 234 | rberror = pcbmap(ddep, |
| 235 | de_cluster(pmp, fndoffset)((fndoffset) >> (pmp)->pm_cnshift), |
| 236 | &bn, 0, &blsize); |
| 237 | if (rberror) |
| 238 | goto err_norollback; |
| 239 | |
| 240 | rberror = bread(pmp->pm_devvp, de_bn2kb(pmp, bn)((bn) << ((pmp)->pm_bnshift - 9)), |
| 241 | blsize, B_MODIFY0, &bp); |
| 242 | if (rberror) { |
| 243 | goto err_norollback; |
| 244 | } |
| 245 | ndep = bptoep(pmp, bp, fndoffset)((struct direntry *)(((char *)(bp)->b_data) + ((fndoffset) & (pmp)->pm_crbomask))); |
| 246 | } else { |
| 247 | ndep--; |
| 248 | fndoffset -= sizeof(struct direntry); |
| 249 | } |
| 250 | } |
| 251 | |
| 252 | /* ignore any further error */ |
| 253 | if (async0) |
| 254 | (void) bdwrite(bp)bwrite(bp); |
| 255 | else |
| 256 | (void) bwrite(bp); |
| 257 | |
| 258 | err_norollback: |
| 259 | return error; |
| 260 | } |
| 261 | |
| 262 | /* |
| 263 | * Read in the disk block containing the directory entry (dirclu, dirofs) |
| 264 | * and return the address of the buf header, and the address of the |
| 265 | * directory entry within the block. |
| 266 | */ |
| 267 | int |
| 268 | readep(struct msdosfsmount *pmp, u_long dirclust, u_long diroffset, struct mkfsbuf **bpp, struct direntry **epp) |
| 269 | { |
| 270 | int error; |
| 271 | daddr_t bn; |
| 272 | int blsize; |
| 273 | |
| 274 | blsize = pmp->pm_bpcluster; |
| 275 | if (dirclust == MSDOSFSROOT0 |
| 276 | && de_blk(pmp, diroffset + blsize)((((((diroffset + blsize)) >> ((pmp))->pm_cnshift)) << ((pmp)->pm_cnshift - (pmp)->pm_bnshift))) > pmp->pm_rootdirsize) |
| 277 | blsize = de_bn2off(pmp, pmp->pm_rootdirsize)((pmp->pm_rootdirsize) << (pmp)->pm_bnshift) & pmp->pm_crbomask; |
| 278 | bn = detobn(pmp, dirclust, diroffset)((dirclust) == 0 ? (((((((((diroffset)))) >> ((((pmp))) )->pm_cnshift)) << ((((pmp)))->pm_cnshift - (((pmp )))->pm_bnshift))) + ((pmp))->pm_rootdirblk) : (((((dirclust ))-2) << ((((pmp)))->pm_cnshift - (((pmp)))->pm_bnshift )) + ((pmp))->pm_firstcluster)); |
| 279 | if ((error = bread(pmp->pm_devvp, de_bn2kb(pmp, bn)((bn) << ((pmp)->pm_bnshift - 9)), blsize, |
| 280 | 0, bpp)) != 0) { |
| 281 | *bpp = NULL((void*)0); |
| 282 | return (error); |
| 283 | } |
| 284 | if (epp) |
| 285 | *epp = bptoep(pmp, *bpp, diroffset)((struct direntry *)(((char *)(*bpp)->b_data) + ((diroffset ) & (pmp)->pm_crbomask))); |
| 286 | return (0); |
| 287 | } |
| 288 | |
| 289 | /* |
| 290 | * Read in the disk block containing the directory entry dep came from and |
| 291 | * return the address of the buf header, and the address of the directory |
| 292 | * entry within the block. |
| 293 | */ |
| 294 | int |
| 295 | readde(struct denode *dep, struct mkfsbuf **bpp, struct direntry **epp) |
| 296 | { |
| 297 | return (readep(dep->de_pmp, dep->de_dirclustde_key.dk_dirclust, dep->de_diroffsetde_key.dk_diroffset, |
| 298 | bpp, epp)); |
| 299 | } |
| 300 | |
| 301 | /* |
| 302 | * Create a unique DOS name in dvp |
| 303 | */ |
| 304 | int |
| 305 | uniqdosname(struct denode *dep, struct componentname *cnp, u_char *cp) |
| 306 | { |
| 307 | struct msdosfsmount *pmp = dep->de_pmp; |
| 308 | struct direntry *dentp; |
| 309 | int gen; |
| 310 | int blsize; |
| 311 | u_long cn; |
| 312 | daddr_t bn; |
| 313 | struct mkfsbuf *bp; |
| 314 | int error; |
| 315 | |
| 316 | for (gen = 1;; gen++) { |
| 317 | /* |
| 318 | * Generate DOS name with generation number |
| 319 | */ |
| 320 | if (!unix2dosfn(cnp->cn_nameptr, cp, cnp->cn_namelen, gen)) |
| 321 | return gen == 1 ? EINVAL22 : EEXIST17; |
| 322 | |
| 323 | /* |
| 324 | * Now look for a dir entry with this exact name |
| 325 | */ |
| 326 | for (cn = error = 0; !error; cn++) { |
| 327 | if ((error = pcbmap(dep, cn, &bn, 0, &blsize)) != 0) { |
| 328 | if (error == E2BIG7) /* EOF reached and not found */ |
| 329 | return 0; |
| 330 | return error; |
| 331 | } |
| 332 | error = bread(pmp->pm_devvp, de_bn2kb(pmp, bn)((bn) << ((pmp)->pm_bnshift - 9)), blsize, |
| 333 | 0, &bp); |
| 334 | if (error) { |
| 335 | return error; |
| 336 | } |
| 337 | for (dentp = (struct direntry *)bp->b_data; |
| 338 | (char *)dentp < (char *)bp->b_data + blsize; |
| 339 | dentp++) { |
| 340 | if (dentp->deName[0] == SLOT_EMPTY0x00) { |
| 341 | /* |
| 342 | * Last used entry and not found |
| 343 | */ |
| 344 | brelse(bp, 0); |
| 345 | return 0; |
| 346 | } |
| 347 | /* |
| 348 | * Ignore volume labels and Win95 entries |
| 349 | */ |
| 350 | if (dentp->deAttributes & ATTR_VOLUME0x08) |
| 351 | continue; |
| 352 | if (!memcmp(dentp->deName, cp, 11)) { |
| 353 | error = EEXIST17; |
| 354 | break; |
| 355 | } |
| 356 | } |
| 357 | brelse(bp, 0); |
| 358 | } |
| 359 | } |
| 360 | } |