Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * namei.c |
| 3 | * |
| 4 | * PURPOSE |
| 5 | * Inode name handling routines for the OSTA-UDF(tm) filesystem. |
| 6 | * |
| 7 | * CONTACTS |
| 8 | * E-mail regarding any portion of the Linux UDF file system should be |
| 9 | * directed to the development team mailing list (run by majordomo): |
| 10 | * linux_udf@hpesjro.fc.hp.com |
| 11 | * |
| 12 | * COPYRIGHT |
| 13 | * This file is distributed under the terms of the GNU General Public |
| 14 | * License (GPL). Copies of the GPL can be obtained from: |
| 15 | * ftp://prep.ai.mit.edu/pub/gnu/GPL |
| 16 | * Each contributing author retains all rights to their own work. |
| 17 | * |
| 18 | * (C) 1998-2004 Ben Fennema |
| 19 | * (C) 1999-2000 Stelias Computing Inc |
| 20 | * |
| 21 | * HISTORY |
| 22 | * |
| 23 | * 12/12/98 blf Created. Split out the lookup code from dir.c |
| 24 | * 04/19/99 blf link, mknod, symlink support |
| 25 | */ |
| 26 | |
| 27 | #include "udfdecl.h" |
| 28 | |
| 29 | #include "udf_i.h" |
| 30 | #include "udf_sb.h" |
| 31 | #include <linux/string.h> |
| 32 | #include <linux/errno.h> |
| 33 | #include <linux/mm.h> |
| 34 | #include <linux/slab.h> |
| 35 | #include <linux/quotaops.h> |
| 36 | #include <linux/smp_lock.h> |
| 37 | #include <linux/buffer_head.h> |
| 38 | |
| 39 | static inline int udf_match(int len1, const char *name1, int len2, const char *name2) |
| 40 | { |
| 41 | if (len1 != len2) |
| 42 | return 0; |
| 43 | return !memcmp(name1, name2, len1); |
| 44 | } |
| 45 | |
| 46 | int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi, |
| 47 | struct fileIdentDesc *sfi, struct udf_fileident_bh *fibh, |
| 48 | uint8_t *impuse, uint8_t *fileident) |
| 49 | { |
| 50 | uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(tag); |
| 51 | uint16_t crc; |
| 52 | uint8_t checksum = 0; |
| 53 | int i; |
| 54 | int offset; |
| 55 | uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse); |
| 56 | uint8_t lfi = cfi->lengthFileIdent; |
| 57 | int padlen = fibh->eoffset - fibh->soffset - liu - lfi - |
| 58 | sizeof(struct fileIdentDesc); |
| 59 | int adinicb = 0; |
| 60 | |
| 61 | if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB) |
| 62 | adinicb = 1; |
| 63 | |
| 64 | offset = fibh->soffset + sizeof(struct fileIdentDesc); |
| 65 | |
| 66 | if (impuse) |
| 67 | { |
| 68 | if (adinicb || (offset + liu < 0)) |
| 69 | memcpy((uint8_t *)sfi->impUse, impuse, liu); |
| 70 | else if (offset >= 0) |
| 71 | memcpy(fibh->ebh->b_data + offset, impuse, liu); |
| 72 | else |
| 73 | { |
| 74 | memcpy((uint8_t *)sfi->impUse, impuse, -offset); |
| 75 | memcpy(fibh->ebh->b_data, impuse - offset, liu + offset); |
| 76 | } |
| 77 | } |
| 78 | |
| 79 | offset += liu; |
| 80 | |
| 81 | if (fileident) |
| 82 | { |
| 83 | if (adinicb || (offset + lfi < 0)) |
| 84 | memcpy((uint8_t *)sfi->fileIdent + liu, fileident, lfi); |
| 85 | else if (offset >= 0) |
| 86 | memcpy(fibh->ebh->b_data + offset, fileident, lfi); |
| 87 | else |
| 88 | { |
| 89 | memcpy((uint8_t *)sfi->fileIdent + liu, fileident, -offset); |
| 90 | memcpy(fibh->ebh->b_data, fileident - offset, lfi + offset); |
| 91 | } |
| 92 | } |
| 93 | |
| 94 | offset += lfi; |
| 95 | |
| 96 | if (adinicb || (offset + padlen < 0)) |
| 97 | memset((uint8_t *)sfi->padding + liu + lfi, 0x00, padlen); |
| 98 | else if (offset >= 0) |
| 99 | memset(fibh->ebh->b_data + offset, 0x00, padlen); |
| 100 | else |
| 101 | { |
| 102 | memset((uint8_t *)sfi->padding + liu + lfi, 0x00, -offset); |
| 103 | memset(fibh->ebh->b_data, 0x00, padlen + offset); |
| 104 | } |
| 105 | |
| 106 | crc = udf_crc((uint8_t *)cfi + sizeof(tag), sizeof(struct fileIdentDesc) - |
| 107 | sizeof(tag), 0); |
| 108 | |
| 109 | if (fibh->sbh == fibh->ebh) |
| 110 | crc = udf_crc((uint8_t *)sfi->impUse, |
| 111 | crclen + sizeof(tag) - sizeof(struct fileIdentDesc), crc); |
| 112 | else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) |
| 113 | crc = udf_crc(fibh->ebh->b_data + sizeof(struct fileIdentDesc) + fibh->soffset, |
| 114 | crclen + sizeof(tag) - sizeof(struct fileIdentDesc), crc); |
| 115 | else |
| 116 | { |
| 117 | crc = udf_crc((uint8_t *)sfi->impUse, |
| 118 | -fibh->soffset - sizeof(struct fileIdentDesc), crc); |
| 119 | crc = udf_crc(fibh->ebh->b_data, fibh->eoffset, crc); |
| 120 | } |
| 121 | |
| 122 | cfi->descTag.descCRC = cpu_to_le16(crc); |
| 123 | cfi->descTag.descCRCLength = cpu_to_le16(crclen); |
| 124 | |
| 125 | for (i=0; i<16; i++) |
| 126 | if (i != 4) |
| 127 | checksum += ((uint8_t *)&cfi->descTag)[i]; |
| 128 | |
| 129 | cfi->descTag.tagChecksum = checksum; |
| 130 | if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset)) |
| 131 | memcpy((uint8_t *)sfi, (uint8_t *)cfi, sizeof(struct fileIdentDesc)); |
| 132 | else |
| 133 | { |
| 134 | memcpy((uint8_t *)sfi, (uint8_t *)cfi, -fibh->soffset); |
| 135 | memcpy(fibh->ebh->b_data, (uint8_t *)cfi - fibh->soffset, |
| 136 | sizeof(struct fileIdentDesc) + fibh->soffset); |
| 137 | } |
| 138 | |
| 139 | if (adinicb) |
| 140 | mark_inode_dirty(inode); |
| 141 | else |
| 142 | { |
| 143 | if (fibh->sbh != fibh->ebh) |
| 144 | mark_buffer_dirty_inode(fibh->ebh, inode); |
| 145 | mark_buffer_dirty_inode(fibh->sbh, inode); |
| 146 | } |
| 147 | return 0; |
| 148 | } |
| 149 | |
| 150 | static struct fileIdentDesc * |
| 151 | udf_find_entry(struct inode *dir, struct dentry *dentry, |
| 152 | struct udf_fileident_bh *fibh, |
| 153 | struct fileIdentDesc *cfi) |
| 154 | { |
| 155 | struct fileIdentDesc *fi=NULL; |
| 156 | loff_t f_pos; |
| 157 | int block, flen; |
| 158 | char fname[UDF_NAME_LEN]; |
| 159 | char *nameptr; |
| 160 | uint8_t lfi; |
| 161 | uint16_t liu; |
| 162 | loff_t size = (udf_ext0_offset(dir) + dir->i_size) >> 2; |
| 163 | kernel_lb_addr bloc, eloc; |
| 164 | uint32_t extoffset, elen, offset; |
| 165 | struct buffer_head *bh = NULL; |
| 166 | |
| 167 | if (!dir) |
| 168 | return NULL; |
| 169 | |
| 170 | f_pos = (udf_ext0_offset(dir) >> 2); |
| 171 | |
| 172 | fibh->soffset = fibh->eoffset = (f_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2; |
| 173 | if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) |
| 174 | fibh->sbh = fibh->ebh = NULL; |
| 175 | else if (inode_bmap(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2), |
| 176 | &bloc, &extoffset, &eloc, &elen, &offset, &bh) == (EXT_RECORDED_ALLOCATED >> 30)) |
| 177 | { |
| 178 | offset >>= dir->i_sb->s_blocksize_bits; |
| 179 | block = udf_get_lb_pblock(dir->i_sb, eloc, offset); |
| 180 | if ((++offset << dir->i_sb->s_blocksize_bits) < elen) |
| 181 | { |
| 182 | if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT) |
| 183 | extoffset -= sizeof(short_ad); |
| 184 | else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG) |
| 185 | extoffset -= sizeof(long_ad); |
| 186 | } |
| 187 | else |
| 188 | offset = 0; |
| 189 | |
| 190 | if (!(fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block))) |
| 191 | { |
| 192 | udf_release_data(bh); |
| 193 | return NULL; |
| 194 | } |
| 195 | } |
| 196 | else |
| 197 | { |
| 198 | udf_release_data(bh); |
| 199 | return NULL; |
| 200 | } |
| 201 | |
| 202 | while ( (f_pos < size) ) |
| 203 | { |
| 204 | fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &bloc, &extoffset, &eloc, &elen, &offset, &bh); |
| 205 | |
| 206 | if (!fi) |
| 207 | { |
| 208 | if (fibh->sbh != fibh->ebh) |
| 209 | udf_release_data(fibh->ebh); |
| 210 | udf_release_data(fibh->sbh); |
| 211 | udf_release_data(bh); |
| 212 | return NULL; |
| 213 | } |
| 214 | |
| 215 | liu = le16_to_cpu(cfi->lengthOfImpUse); |
| 216 | lfi = cfi->lengthFileIdent; |
| 217 | |
| 218 | if (fibh->sbh == fibh->ebh) |
| 219 | { |
| 220 | nameptr = fi->fileIdent + liu; |
| 221 | } |
| 222 | else |
| 223 | { |
| 224 | int poffset; /* Unpaded ending offset */ |
| 225 | |
| 226 | poffset = fibh->soffset + sizeof(struct fileIdentDesc) + liu + lfi; |
| 227 | |
| 228 | if (poffset >= lfi) |
| 229 | nameptr = (uint8_t *)(fibh->ebh->b_data + poffset - lfi); |
| 230 | else |
| 231 | { |
| 232 | nameptr = fname; |
| 233 | memcpy(nameptr, fi->fileIdent + liu, lfi - poffset); |
| 234 | memcpy(nameptr + lfi - poffset, fibh->ebh->b_data, poffset); |
| 235 | } |
| 236 | } |
| 237 | |
| 238 | if ( (cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0 ) |
| 239 | { |
| 240 | if ( !UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE) ) |
| 241 | continue; |
| 242 | } |
| 243 | |
| 244 | if ( (cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0 ) |
| 245 | { |
| 246 | if ( !UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNHIDE) ) |
| 247 | continue; |
| 248 | } |
| 249 | |
| 250 | if (!lfi) |
| 251 | continue; |
| 252 | |
| 253 | if ((flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi))) |
| 254 | { |
| 255 | if (udf_match(flen, fname, dentry->d_name.len, dentry->d_name.name)) |
| 256 | { |
| 257 | udf_release_data(bh); |
| 258 | return fi; |
| 259 | } |
| 260 | } |
| 261 | } |
| 262 | if (fibh->sbh != fibh->ebh) |
| 263 | udf_release_data(fibh->ebh); |
| 264 | udf_release_data(fibh->sbh); |
| 265 | udf_release_data(bh); |
| 266 | return NULL; |
| 267 | } |
| 268 | |
| 269 | /* |
| 270 | * udf_lookup |
| 271 | * |
| 272 | * PURPOSE |
| 273 | * Look-up the inode for a given name. |
| 274 | * |
| 275 | * DESCRIPTION |
| 276 | * Required - lookup_dentry() will return -ENOTDIR if this routine is not |
| 277 | * available for a directory. The filesystem is useless if this routine is |
| 278 | * not available for at least the filesystem's root directory. |
| 279 | * |
| 280 | * This routine is passed an incomplete dentry - it must be completed by |
| 281 | * calling d_add(dentry, inode). If the name does not exist, then the |
| 282 | * specified inode must be set to null. An error should only be returned |
| 283 | * when the lookup fails for a reason other than the name not existing. |
| 284 | * Note that the directory inode semaphore is held during the call. |
| 285 | * |
| 286 | * Refer to lookup_dentry() in fs/namei.c |
| 287 | * lookup_dentry() -> lookup() -> real_lookup() -> . |
| 288 | * |
| 289 | * PRE-CONDITIONS |
| 290 | * dir Pointer to inode of parent directory. |
| 291 | * dentry Pointer to dentry to complete. |
| 292 | * nd Pointer to lookup nameidata |
| 293 | * |
| 294 | * POST-CONDITIONS |
| 295 | * <return> Zero on success. |
| 296 | * |
| 297 | * HISTORY |
| 298 | * July 1, 1997 - Andrew E. Mileski |
| 299 | * Written, tested, and released. |
| 300 | */ |
| 301 | |
| 302 | static struct dentry * |
| 303 | udf_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) |
| 304 | { |
| 305 | struct inode *inode = NULL; |
| 306 | struct fileIdentDesc cfi, *fi; |
| 307 | struct udf_fileident_bh fibh; |
| 308 | |
| 309 | if (dentry->d_name.len > UDF_NAME_LEN-2) |
| 310 | return ERR_PTR(-ENAMETOOLONG); |
| 311 | |
| 312 | lock_kernel(); |
| 313 | #ifdef UDF_RECOVERY |
| 314 | /* temporary shorthand for specifying files by inode number */ |
| 315 | if (!strncmp(dentry->d_name.name, ".B=", 3) ) |
| 316 | { |
| 317 | kernel_lb_addr lb = { 0, simple_strtoul(dentry->d_name.name+3, NULL, 0) }; |
| 318 | inode = udf_iget(dir->i_sb, lb); |
| 319 | if (!inode) |
| 320 | { |
| 321 | unlock_kernel(); |
| 322 | return ERR_PTR(-EACCES); |
| 323 | } |
| 324 | } |
| 325 | else |
| 326 | #endif /* UDF_RECOVERY */ |
| 327 | |
| 328 | if ((fi = udf_find_entry(dir, dentry, &fibh, &cfi))) |
| 329 | { |
| 330 | if (fibh.sbh != fibh.ebh) |
| 331 | udf_release_data(fibh.ebh); |
| 332 | udf_release_data(fibh.sbh); |
| 333 | |
| 334 | inode = udf_iget(dir->i_sb, lelb_to_cpu(cfi.icb.extLocation)); |
| 335 | if ( !inode ) |
| 336 | { |
| 337 | unlock_kernel(); |
| 338 | return ERR_PTR(-EACCES); |
| 339 | } |
| 340 | } |
| 341 | unlock_kernel(); |
| 342 | d_add(dentry, inode); |
| 343 | return NULL; |
| 344 | } |
| 345 | |
| 346 | static struct fileIdentDesc * |
| 347 | udf_add_entry(struct inode *dir, struct dentry *dentry, |
| 348 | struct udf_fileident_bh *fibh, |
| 349 | struct fileIdentDesc *cfi, int *err) |
| 350 | { |
| 351 | struct super_block *sb; |
| 352 | struct fileIdentDesc *fi=NULL; |
| 353 | char name[UDF_NAME_LEN], fname[UDF_NAME_LEN]; |
| 354 | int namelen; |
| 355 | loff_t f_pos; |
| 356 | int flen; |
| 357 | char *nameptr; |
| 358 | loff_t size = (udf_ext0_offset(dir) + dir->i_size) >> 2; |
| 359 | int nfidlen; |
| 360 | uint8_t lfi; |
| 361 | uint16_t liu; |
| 362 | int block; |
| 363 | kernel_lb_addr bloc, eloc; |
| 364 | uint32_t extoffset, elen, offset; |
| 365 | struct buffer_head *bh = NULL; |
| 366 | |
| 367 | sb = dir->i_sb; |
| 368 | |
| 369 | if (dentry) |
| 370 | { |
| 371 | if (!dentry->d_name.len) |
| 372 | { |
| 373 | *err = -EINVAL; |
| 374 | return NULL; |
| 375 | } |
| 376 | |
| 377 | if ( !(namelen = udf_put_filename(sb, dentry->d_name.name, name, dentry->d_name.len))) |
| 378 | { |
| 379 | *err = -ENAMETOOLONG; |
| 380 | return NULL; |
| 381 | } |
| 382 | } |
| 383 | else |
| 384 | namelen = 0; |
| 385 | |
| 386 | nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3; |
| 387 | |
| 388 | f_pos = (udf_ext0_offset(dir) >> 2); |
| 389 | |
| 390 | fibh->soffset = fibh->eoffset = (f_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2; |
| 391 | if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) |
| 392 | fibh->sbh = fibh->ebh = NULL; |
| 393 | else if (inode_bmap(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2), |
| 394 | &bloc, &extoffset, &eloc, &elen, &offset, &bh) == (EXT_RECORDED_ALLOCATED >> 30)) |
| 395 | { |
| 396 | offset >>= dir->i_sb->s_blocksize_bits; |
| 397 | block = udf_get_lb_pblock(dir->i_sb, eloc, offset); |
| 398 | if ((++offset << dir->i_sb->s_blocksize_bits) < elen) |
| 399 | { |
| 400 | if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT) |
| 401 | extoffset -= sizeof(short_ad); |
| 402 | else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG) |
| 403 | extoffset -= sizeof(long_ad); |
| 404 | } |
| 405 | else |
| 406 | offset = 0; |
| 407 | |
| 408 | if (!(fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block))) |
| 409 | { |
| 410 | udf_release_data(bh); |
| 411 | *err = -EIO; |
| 412 | return NULL; |
| 413 | } |
| 414 | |
| 415 | block = UDF_I_LOCATION(dir).logicalBlockNum; |
| 416 | |
| 417 | } |
| 418 | else |
| 419 | { |
| 420 | block = udf_get_lb_pblock(dir->i_sb, UDF_I_LOCATION(dir), 0); |
| 421 | fibh->sbh = fibh->ebh = NULL; |
| 422 | fibh->soffset = fibh->eoffset = sb->s_blocksize; |
| 423 | goto add; |
| 424 | } |
| 425 | |
| 426 | while ( (f_pos < size) ) |
| 427 | { |
| 428 | fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &bloc, &extoffset, &eloc, &elen, &offset, &bh); |
| 429 | |
| 430 | if (!fi) |
| 431 | { |
| 432 | if (fibh->sbh != fibh->ebh) |
| 433 | udf_release_data(fibh->ebh); |
| 434 | udf_release_data(fibh->sbh); |
| 435 | udf_release_data(bh); |
| 436 | *err = -EIO; |
| 437 | return NULL; |
| 438 | } |
| 439 | |
| 440 | liu = le16_to_cpu(cfi->lengthOfImpUse); |
| 441 | lfi = cfi->lengthFileIdent; |
| 442 | |
| 443 | if (fibh->sbh == fibh->ebh) |
| 444 | nameptr = fi->fileIdent + liu; |
| 445 | else |
| 446 | { |
| 447 | int poffset; /* Unpaded ending offset */ |
| 448 | |
| 449 | poffset = fibh->soffset + sizeof(struct fileIdentDesc) + liu + lfi; |
| 450 | |
| 451 | if (poffset >= lfi) |
| 452 | nameptr = (char *)(fibh->ebh->b_data + poffset - lfi); |
| 453 | else |
| 454 | { |
| 455 | nameptr = fname; |
| 456 | memcpy(nameptr, fi->fileIdent + liu, lfi - poffset); |
| 457 | memcpy(nameptr + lfi - poffset, fibh->ebh->b_data, poffset); |
| 458 | } |
| 459 | } |
| 460 | |
| 461 | if ( (cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0 ) |
| 462 | { |
| 463 | if (((sizeof(struct fileIdentDesc) + liu + lfi + 3) & ~3) == nfidlen) |
| 464 | { |
| 465 | udf_release_data(bh); |
| 466 | cfi->descTag.tagSerialNum = cpu_to_le16(1); |
| 467 | cfi->fileVersionNum = cpu_to_le16(1); |
| 468 | cfi->fileCharacteristics = 0; |
| 469 | cfi->lengthFileIdent = namelen; |
| 470 | cfi->lengthOfImpUse = cpu_to_le16(0); |
| 471 | if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) |
| 472 | return fi; |
| 473 | else |
| 474 | { |
| 475 | *err = -EIO; |
| 476 | return NULL; |
| 477 | } |
| 478 | } |
| 479 | } |
| 480 | |
| 481 | if (!lfi || !dentry) |
| 482 | continue; |
| 483 | |
| 484 | if ((flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi)) && |
| 485 | udf_match(flen, fname, dentry->d_name.len, dentry->d_name.name)) |
| 486 | { |
| 487 | if (fibh->sbh != fibh->ebh) |
| 488 | udf_release_data(fibh->ebh); |
| 489 | udf_release_data(fibh->sbh); |
| 490 | udf_release_data(bh); |
| 491 | *err = -EEXIST; |
| 492 | return NULL; |
| 493 | } |
| 494 | } |
| 495 | |
| 496 | add: |
| 497 | f_pos += nfidlen; |
| 498 | |
| 499 | if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB && |
| 500 | sb->s_blocksize - fibh->eoffset < nfidlen) |
| 501 | { |
| 502 | udf_release_data(bh); |
| 503 | bh = NULL; |
| 504 | fibh->soffset -= udf_ext0_offset(dir); |
| 505 | fibh->eoffset -= udf_ext0_offset(dir); |
| 506 | f_pos -= (udf_ext0_offset(dir) >> 2); |
| 507 | if (fibh->sbh != fibh->ebh) |
| 508 | udf_release_data(fibh->ebh); |
| 509 | udf_release_data(fibh->sbh); |
| 510 | if (!(fibh->sbh = fibh->ebh = udf_expand_dir_adinicb(dir, &block, err))) |
| 511 | return NULL; |
| 512 | bloc = UDF_I_LOCATION(dir); |
| 513 | eloc.logicalBlockNum = block; |
| 514 | eloc.partitionReferenceNum = UDF_I_LOCATION(dir).partitionReferenceNum; |
| 515 | elen = dir->i_sb->s_blocksize; |
| 516 | extoffset = udf_file_entry_alloc_offset(dir); |
| 517 | if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT) |
| 518 | extoffset += sizeof(short_ad); |
| 519 | else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG) |
| 520 | extoffset += sizeof(long_ad); |
| 521 | } |
| 522 | |
| 523 | if (sb->s_blocksize - fibh->eoffset >= nfidlen) |
| 524 | { |
| 525 | fibh->soffset = fibh->eoffset; |
| 526 | fibh->eoffset += nfidlen; |
| 527 | if (fibh->sbh != fibh->ebh) |
| 528 | { |
| 529 | udf_release_data(fibh->sbh); |
| 530 | fibh->sbh = fibh->ebh; |
| 531 | } |
| 532 | |
| 533 | if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) |
| 534 | { |
| 535 | block = UDF_I_LOCATION(dir).logicalBlockNum; |
| 536 | fi = (struct fileIdentDesc *)(UDF_I_DATA(dir) + fibh->soffset - udf_ext0_offset(dir) + UDF_I_LENEATTR(dir)); |
| 537 | } |
| 538 | else |
| 539 | { |
| 540 | block = eloc.logicalBlockNum + ((elen - 1) >> |
| 541 | dir->i_sb->s_blocksize_bits); |
| 542 | fi = (struct fileIdentDesc *)(fibh->sbh->b_data + fibh->soffset); |
| 543 | } |
| 544 | } |
| 545 | else |
| 546 | { |
| 547 | fibh->soffset = fibh->eoffset - sb->s_blocksize; |
| 548 | fibh->eoffset += nfidlen - sb->s_blocksize; |
| 549 | if (fibh->sbh != fibh->ebh) |
| 550 | { |
| 551 | udf_release_data(fibh->sbh); |
| 552 | fibh->sbh = fibh->ebh; |
| 553 | } |
| 554 | |
| 555 | block = eloc.logicalBlockNum + ((elen - 1) >> |
| 556 | dir->i_sb->s_blocksize_bits); |
| 557 | |
| 558 | if (!(fibh->ebh = udf_bread(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2), 1, err))) |
| 559 | { |
| 560 | udf_release_data(bh); |
| 561 | udf_release_data(fibh->sbh); |
| 562 | return NULL; |
| 563 | } |
| 564 | |
| 565 | if (!(fibh->soffset)) |
| 566 | { |
| 567 | if (udf_next_aext(dir, &bloc, &extoffset, &eloc, &elen, &bh, 1) == |
| 568 | (EXT_RECORDED_ALLOCATED >> 30)) |
| 569 | { |
| 570 | block = eloc.logicalBlockNum + ((elen - 1) >> |
| 571 | dir->i_sb->s_blocksize_bits); |
| 572 | } |
| 573 | else |
| 574 | block ++; |
| 575 | |
| 576 | udf_release_data(fibh->sbh); |
| 577 | fibh->sbh = fibh->ebh; |
| 578 | fi = (struct fileIdentDesc *)(fibh->sbh->b_data); |
| 579 | } |
| 580 | else |
| 581 | { |
| 582 | fi = (struct fileIdentDesc *) |
| 583 | (fibh->sbh->b_data + sb->s_blocksize + fibh->soffset); |
| 584 | } |
| 585 | } |
| 586 | |
| 587 | memset(cfi, 0, sizeof(struct fileIdentDesc)); |
| 588 | if (UDF_SB_UDFREV(sb) >= 0x0200) |
| 589 | udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block, sizeof(tag)); |
| 590 | else |
| 591 | udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block, sizeof(tag)); |
| 592 | cfi->fileVersionNum = cpu_to_le16(1); |
| 593 | cfi->lengthFileIdent = namelen; |
| 594 | cfi->lengthOfImpUse = cpu_to_le16(0); |
| 595 | if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) |
| 596 | { |
| 597 | udf_release_data(bh); |
| 598 | dir->i_size += nfidlen; |
| 599 | if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) |
| 600 | UDF_I_LENALLOC(dir) += nfidlen; |
| 601 | mark_inode_dirty(dir); |
| 602 | return fi; |
| 603 | } |
| 604 | else |
| 605 | { |
| 606 | udf_release_data(bh); |
| 607 | if (fibh->sbh != fibh->ebh) |
| 608 | udf_release_data(fibh->ebh); |
| 609 | udf_release_data(fibh->sbh); |
| 610 | *err = -EIO; |
| 611 | return NULL; |
| 612 | } |
| 613 | } |
| 614 | |
| 615 | static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi, |
| 616 | struct udf_fileident_bh *fibh, struct fileIdentDesc *cfi) |
| 617 | { |
| 618 | cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED; |
| 619 | if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT)) |
| 620 | memset(&(cfi->icb), 0x00, sizeof(long_ad)); |
| 621 | return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL); |
| 622 | } |
| 623 | |
| 624 | static int udf_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd) |
| 625 | { |
| 626 | struct udf_fileident_bh fibh; |
| 627 | struct inode *inode; |
| 628 | struct fileIdentDesc cfi, *fi; |
| 629 | int err; |
| 630 | |
| 631 | lock_kernel(); |
| 632 | inode = udf_new_inode(dir, mode, &err); |
| 633 | if (!inode) |
| 634 | { |
| 635 | unlock_kernel(); |
| 636 | return err; |
| 637 | } |
| 638 | |
| 639 | if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB) |
| 640 | inode->i_data.a_ops = &udf_adinicb_aops; |
| 641 | else |
| 642 | inode->i_data.a_ops = &udf_aops; |
| 643 | inode->i_op = &udf_file_inode_operations; |
| 644 | inode->i_fop = &udf_file_operations; |
| 645 | inode->i_mode = mode; |
| 646 | mark_inode_dirty(inode); |
| 647 | |
| 648 | if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err))) |
| 649 | { |
| 650 | inode->i_nlink --; |
| 651 | mark_inode_dirty(inode); |
| 652 | iput(inode); |
| 653 | unlock_kernel(); |
| 654 | return err; |
| 655 | } |
| 656 | cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); |
| 657 | cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode)); |
| 658 | *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = |
| 659 | cpu_to_le32(UDF_I_UNIQUE(inode) & 0x00000000FFFFFFFFUL); |
| 660 | udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); |
| 661 | if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) |
| 662 | { |
| 663 | mark_inode_dirty(dir); |
| 664 | } |
| 665 | if (fibh.sbh != fibh.ebh) |
| 666 | udf_release_data(fibh.ebh); |
| 667 | udf_release_data(fibh.sbh); |
| 668 | unlock_kernel(); |
| 669 | d_instantiate(dentry, inode); |
| 670 | return 0; |
| 671 | } |
| 672 | |
| 673 | static int udf_mknod(struct inode * dir, struct dentry * dentry, int mode, dev_t rdev) |
| 674 | { |
| 675 | struct inode * inode; |
| 676 | struct udf_fileident_bh fibh; |
| 677 | struct fileIdentDesc cfi, *fi; |
| 678 | int err; |
| 679 | |
| 680 | if (!old_valid_dev(rdev)) |
| 681 | return -EINVAL; |
| 682 | |
| 683 | lock_kernel(); |
| 684 | err = -EIO; |
| 685 | inode = udf_new_inode(dir, mode, &err); |
| 686 | if (!inode) |
| 687 | goto out; |
| 688 | |
| 689 | inode->i_uid = current->fsuid; |
| 690 | init_special_inode(inode, mode, rdev); |
| 691 | if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err))) |
| 692 | { |
| 693 | inode->i_nlink --; |
| 694 | mark_inode_dirty(inode); |
| 695 | iput(inode); |
| 696 | unlock_kernel(); |
| 697 | return err; |
| 698 | } |
| 699 | cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); |
| 700 | cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode)); |
| 701 | *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = |
| 702 | cpu_to_le32(UDF_I_UNIQUE(inode) & 0x00000000FFFFFFFFUL); |
| 703 | udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); |
| 704 | if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) |
| 705 | { |
| 706 | mark_inode_dirty(dir); |
| 707 | } |
| 708 | mark_inode_dirty(inode); |
| 709 | |
| 710 | if (fibh.sbh != fibh.ebh) |
| 711 | udf_release_data(fibh.ebh); |
| 712 | udf_release_data(fibh.sbh); |
| 713 | d_instantiate(dentry, inode); |
| 714 | err = 0; |
| 715 | out: |
| 716 | unlock_kernel(); |
| 717 | return err; |
| 718 | } |
| 719 | |
| 720 | static int udf_mkdir(struct inode * dir, struct dentry * dentry, int mode) |
| 721 | { |
| 722 | struct inode * inode; |
| 723 | struct udf_fileident_bh fibh; |
| 724 | struct fileIdentDesc cfi, *fi; |
| 725 | int err; |
| 726 | |
| 727 | lock_kernel(); |
| 728 | err = -EMLINK; |
| 729 | if (dir->i_nlink >= (256<<sizeof(dir->i_nlink))-1) |
| 730 | goto out; |
| 731 | |
| 732 | err = -EIO; |
| 733 | inode = udf_new_inode(dir, S_IFDIR, &err); |
| 734 | if (!inode) |
| 735 | goto out; |
| 736 | |
| 737 | inode->i_op = &udf_dir_inode_operations; |
| 738 | inode->i_fop = &udf_dir_operations; |
| 739 | if (!(fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err))) |
| 740 | { |
| 741 | inode->i_nlink--; |
| 742 | mark_inode_dirty(inode); |
| 743 | iput(inode); |
| 744 | goto out; |
| 745 | } |
| 746 | inode->i_nlink = 2; |
| 747 | cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); |
| 748 | cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(dir)); |
| 749 | *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = |
| 750 | cpu_to_le32(UDF_I_UNIQUE(dir) & 0x00000000FFFFFFFFUL); |
| 751 | cfi.fileCharacteristics = FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT; |
| 752 | udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL); |
| 753 | udf_release_data(fibh.sbh); |
| 754 | inode->i_mode = S_IFDIR | mode; |
| 755 | if (dir->i_mode & S_ISGID) |
| 756 | inode->i_mode |= S_ISGID; |
| 757 | mark_inode_dirty(inode); |
| 758 | |
| 759 | if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err))) |
| 760 | { |
| 761 | inode->i_nlink = 0; |
| 762 | mark_inode_dirty(inode); |
| 763 | iput(inode); |
| 764 | goto out; |
| 765 | } |
| 766 | cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); |
| 767 | cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode)); |
| 768 | *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = |
| 769 | cpu_to_le32(UDF_I_UNIQUE(inode) & 0x00000000FFFFFFFFUL); |
| 770 | cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY; |
| 771 | udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); |
| 772 | dir->i_nlink++; |
| 773 | mark_inode_dirty(dir); |
| 774 | d_instantiate(dentry, inode); |
| 775 | if (fibh.sbh != fibh.ebh) |
| 776 | udf_release_data(fibh.ebh); |
| 777 | udf_release_data(fibh.sbh); |
| 778 | err = 0; |
| 779 | out: |
| 780 | unlock_kernel(); |
| 781 | return err; |
| 782 | } |
| 783 | |
| 784 | static int empty_dir(struct inode *dir) |
| 785 | { |
| 786 | struct fileIdentDesc *fi, cfi; |
| 787 | struct udf_fileident_bh fibh; |
| 788 | loff_t f_pos; |
| 789 | loff_t size = (udf_ext0_offset(dir) + dir->i_size) >> 2; |
| 790 | int block; |
| 791 | kernel_lb_addr bloc, eloc; |
| 792 | uint32_t extoffset, elen, offset; |
| 793 | struct buffer_head *bh = NULL; |
| 794 | |
| 795 | f_pos = (udf_ext0_offset(dir) >> 2); |
| 796 | |
| 797 | fibh.soffset = fibh.eoffset = (f_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2; |
| 798 | |
| 799 | if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) |
| 800 | fibh.sbh = fibh.ebh = NULL; |
| 801 | else if (inode_bmap(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2), |
| 802 | &bloc, &extoffset, &eloc, &elen, &offset, &bh) == (EXT_RECORDED_ALLOCATED >> 30)) |
| 803 | { |
| 804 | offset >>= dir->i_sb->s_blocksize_bits; |
| 805 | block = udf_get_lb_pblock(dir->i_sb, eloc, offset); |
| 806 | if ((++offset << dir->i_sb->s_blocksize_bits) < elen) |
| 807 | { |
| 808 | if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT) |
| 809 | extoffset -= sizeof(short_ad); |
| 810 | else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG) |
| 811 | extoffset -= sizeof(long_ad); |
| 812 | } |
| 813 | else |
| 814 | offset = 0; |
| 815 | |
| 816 | if (!(fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block))) |
| 817 | { |
| 818 | udf_release_data(bh); |
| 819 | return 0; |
| 820 | } |
| 821 | } |
| 822 | else |
| 823 | { |
| 824 | udf_release_data(bh); |
| 825 | return 0; |
| 826 | } |
| 827 | |
| 828 | |
| 829 | while ( (f_pos < size) ) |
| 830 | { |
| 831 | fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &bloc, &extoffset, &eloc, &elen, &offset, &bh); |
| 832 | |
| 833 | if (!fi) |
| 834 | { |
| 835 | if (fibh.sbh != fibh.ebh) |
| 836 | udf_release_data(fibh.ebh); |
| 837 | udf_release_data(fibh.sbh); |
| 838 | udf_release_data(bh); |
| 839 | return 0; |
| 840 | } |
| 841 | |
| 842 | if (cfi.lengthFileIdent && (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) |
| 843 | { |
| 844 | if (fibh.sbh != fibh.ebh) |
| 845 | udf_release_data(fibh.ebh); |
| 846 | udf_release_data(fibh.sbh); |
| 847 | udf_release_data(bh); |
| 848 | return 0; |
| 849 | } |
| 850 | } |
| 851 | if (fibh.sbh != fibh.ebh) |
| 852 | udf_release_data(fibh.ebh); |
| 853 | udf_release_data(fibh.sbh); |
| 854 | udf_release_data(bh); |
| 855 | return 1; |
| 856 | } |
| 857 | |
| 858 | static int udf_rmdir(struct inode * dir, struct dentry * dentry) |
| 859 | { |
| 860 | int retval; |
| 861 | struct inode * inode = dentry->d_inode; |
| 862 | struct udf_fileident_bh fibh; |
| 863 | struct fileIdentDesc *fi, cfi; |
| 864 | kernel_lb_addr tloc; |
| 865 | |
| 866 | retval = -ENOENT; |
| 867 | lock_kernel(); |
| 868 | fi = udf_find_entry(dir, dentry, &fibh, &cfi); |
| 869 | if (!fi) |
| 870 | goto out; |
| 871 | |
| 872 | retval = -EIO; |
| 873 | tloc = lelb_to_cpu(cfi.icb.extLocation); |
| 874 | if (udf_get_lb_pblock(dir->i_sb, tloc, 0) != inode->i_ino) |
| 875 | goto end_rmdir; |
| 876 | retval = -ENOTEMPTY; |
| 877 | if (!empty_dir(inode)) |
| 878 | goto end_rmdir; |
| 879 | retval = udf_delete_entry(dir, fi, &fibh, &cfi); |
| 880 | if (retval) |
| 881 | goto end_rmdir; |
| 882 | if (inode->i_nlink != 2) |
| 883 | udf_warning(inode->i_sb, "udf_rmdir", |
| 884 | "empty directory has nlink != 2 (%d)", |
| 885 | inode->i_nlink); |
| 886 | inode->i_nlink = 0; |
| 887 | inode->i_size = 0; |
| 888 | mark_inode_dirty(inode); |
| 889 | dir->i_nlink --; |
| 890 | inode->i_ctime = dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb); |
| 891 | mark_inode_dirty(dir); |
| 892 | |
| 893 | end_rmdir: |
| 894 | if (fibh.sbh != fibh.ebh) |
| 895 | udf_release_data(fibh.ebh); |
| 896 | udf_release_data(fibh.sbh); |
| 897 | out: |
| 898 | unlock_kernel(); |
| 899 | return retval; |
| 900 | } |
| 901 | |
| 902 | static int udf_unlink(struct inode * dir, struct dentry * dentry) |
| 903 | { |
| 904 | int retval; |
| 905 | struct inode * inode = dentry->d_inode; |
| 906 | struct udf_fileident_bh fibh; |
| 907 | struct fileIdentDesc *fi; |
| 908 | struct fileIdentDesc cfi; |
| 909 | kernel_lb_addr tloc; |
| 910 | |
| 911 | retval = -ENOENT; |
| 912 | lock_kernel(); |
| 913 | fi = udf_find_entry(dir, dentry, &fibh, &cfi); |
| 914 | if (!fi) |
| 915 | goto out; |
| 916 | |
| 917 | retval = -EIO; |
| 918 | tloc = lelb_to_cpu(cfi.icb.extLocation); |
| 919 | if (udf_get_lb_pblock(dir->i_sb, tloc, 0) != inode->i_ino) |
| 920 | goto end_unlink; |
| 921 | |
| 922 | if (!inode->i_nlink) |
| 923 | { |
| 924 | udf_debug("Deleting nonexistent file (%lu), %d\n", |
| 925 | inode->i_ino, inode->i_nlink); |
| 926 | inode->i_nlink = 1; |
| 927 | } |
| 928 | retval = udf_delete_entry(dir, fi, &fibh, &cfi); |
| 929 | if (retval) |
| 930 | goto end_unlink; |
| 931 | dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb); |
| 932 | mark_inode_dirty(dir); |
| 933 | inode->i_nlink--; |
| 934 | mark_inode_dirty(inode); |
| 935 | inode->i_ctime = dir->i_ctime; |
| 936 | retval = 0; |
| 937 | |
| 938 | end_unlink: |
| 939 | if (fibh.sbh != fibh.ebh) |
| 940 | udf_release_data(fibh.ebh); |
| 941 | udf_release_data(fibh.sbh); |
| 942 | out: |
| 943 | unlock_kernel(); |
| 944 | return retval; |
| 945 | } |
| 946 | |
| 947 | static int udf_symlink(struct inode * dir, struct dentry * dentry, const char * symname) |
| 948 | { |
| 949 | struct inode * inode; |
| 950 | struct pathComponent *pc; |
| 951 | char *compstart; |
| 952 | struct udf_fileident_bh fibh; |
| 953 | struct buffer_head *bh = NULL; |
| 954 | int eoffset, elen = 0; |
| 955 | struct fileIdentDesc *fi; |
| 956 | struct fileIdentDesc cfi; |
| 957 | char *ea; |
| 958 | int err; |
| 959 | int block; |
| 960 | char name[UDF_NAME_LEN]; |
| 961 | int namelen; |
| 962 | |
| 963 | lock_kernel(); |
| 964 | if (!(inode = udf_new_inode(dir, S_IFLNK, &err))) |
| 965 | goto out; |
| 966 | |
| 967 | inode->i_mode = S_IFLNK | S_IRWXUGO; |
| 968 | inode->i_data.a_ops = &udf_symlink_aops; |
| 969 | inode->i_op = &page_symlink_inode_operations; |
| 970 | |
| 971 | if (UDF_I_ALLOCTYPE(inode) != ICBTAG_FLAG_AD_IN_ICB) |
| 972 | { |
| 973 | struct buffer_head *bh = NULL; |
| 974 | kernel_lb_addr bloc, eloc; |
| 975 | uint32_t elen, extoffset; |
| 976 | |
| 977 | block = udf_new_block(inode->i_sb, inode, |
| 978 | UDF_I_LOCATION(inode).partitionReferenceNum, |
| 979 | UDF_I_LOCATION(inode).logicalBlockNum, &err); |
| 980 | if (!block) |
| 981 | goto out_no_entry; |
| 982 | bloc = UDF_I_LOCATION(inode); |
| 983 | eloc.logicalBlockNum = block; |
| 984 | eloc.partitionReferenceNum = UDF_I_LOCATION(inode).partitionReferenceNum; |
| 985 | elen = inode->i_sb->s_blocksize; |
| 986 | UDF_I_LENEXTENTS(inode) = elen; |
| 987 | extoffset = udf_file_entry_alloc_offset(inode); |
| 988 | udf_add_aext(inode, &bloc, &extoffset, eloc, elen, &bh, 0); |
| 989 | udf_release_data(bh); |
| 990 | |
| 991 | block = udf_get_pblock(inode->i_sb, block, |
| 992 | UDF_I_LOCATION(inode).partitionReferenceNum, 0); |
| 993 | bh = udf_tread(inode->i_sb, block); |
| 994 | lock_buffer(bh); |
| 995 | memset(bh->b_data, 0x00, inode->i_sb->s_blocksize); |
| 996 | set_buffer_uptodate(bh); |
| 997 | unlock_buffer(bh); |
| 998 | mark_buffer_dirty_inode(bh, inode); |
| 999 | ea = bh->b_data + udf_ext0_offset(inode); |
| 1000 | } |
| 1001 | else |
| 1002 | ea = UDF_I_DATA(inode) + UDF_I_LENEATTR(inode); |
| 1003 | |
| 1004 | eoffset = inode->i_sb->s_blocksize - udf_ext0_offset(inode); |
| 1005 | pc = (struct pathComponent *)ea; |
| 1006 | |
| 1007 | if (*symname == '/') |
| 1008 | { |
| 1009 | do |
| 1010 | { |
| 1011 | symname++; |
| 1012 | } while (*symname == '/'); |
| 1013 | |
| 1014 | pc->componentType = 1; |
| 1015 | pc->lengthComponentIdent = 0; |
| 1016 | pc->componentFileVersionNum = 0; |
| 1017 | pc += sizeof(struct pathComponent); |
| 1018 | elen += sizeof(struct pathComponent); |
| 1019 | } |
| 1020 | |
| 1021 | err = -ENAMETOOLONG; |
| 1022 | |
| 1023 | while (*symname) |
| 1024 | { |
| 1025 | if (elen + sizeof(struct pathComponent) > eoffset) |
| 1026 | goto out_no_entry; |
| 1027 | |
| 1028 | pc = (struct pathComponent *)(ea + elen); |
| 1029 | |
| 1030 | compstart = (char *)symname; |
| 1031 | |
| 1032 | do |
| 1033 | { |
| 1034 | symname++; |
| 1035 | } while (*symname && *symname != '/'); |
| 1036 | |
| 1037 | pc->componentType = 5; |
| 1038 | pc->lengthComponentIdent = 0; |
| 1039 | pc->componentFileVersionNum = 0; |
| 1040 | if (compstart[0] == '.') |
| 1041 | { |
| 1042 | if ((symname-compstart) == 1) |
| 1043 | pc->componentType = 4; |
| 1044 | else if ((symname-compstart) == 2 && compstart[1] == '.') |
| 1045 | pc->componentType = 3; |
| 1046 | } |
| 1047 | |
| 1048 | if (pc->componentType == 5) |
| 1049 | { |
| 1050 | if ( !(namelen = udf_put_filename(inode->i_sb, compstart, name, symname-compstart))) |
| 1051 | goto out_no_entry; |
| 1052 | |
| 1053 | if (elen + sizeof(struct pathComponent) + namelen > eoffset) |
| 1054 | goto out_no_entry; |
| 1055 | else |
| 1056 | pc->lengthComponentIdent = namelen; |
| 1057 | |
| 1058 | memcpy(pc->componentIdent, name, namelen); |
| 1059 | } |
| 1060 | |
| 1061 | elen += sizeof(struct pathComponent) + pc->lengthComponentIdent; |
| 1062 | |
| 1063 | if (*symname) |
| 1064 | { |
| 1065 | do |
| 1066 | { |
| 1067 | symname++; |
| 1068 | } while (*symname == '/'); |
| 1069 | } |
| 1070 | } |
| 1071 | |
| 1072 | udf_release_data(bh); |
| 1073 | inode->i_size = elen; |
| 1074 | if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB) |
| 1075 | UDF_I_LENALLOC(inode) = inode->i_size; |
| 1076 | mark_inode_dirty(inode); |
| 1077 | |
| 1078 | if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err))) |
| 1079 | goto out_no_entry; |
| 1080 | cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); |
| 1081 | cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode)); |
| 1082 | if (UDF_SB_LVIDBH(inode->i_sb)) |
| 1083 | { |
| 1084 | struct logicalVolHeaderDesc *lvhd; |
| 1085 | uint64_t uniqueID; |
| 1086 | lvhd = (struct logicalVolHeaderDesc *)(UDF_SB_LVID(inode->i_sb)->logicalVolContentsUse); |
| 1087 | uniqueID = le64_to_cpu(lvhd->uniqueID); |
| 1088 | *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = |
| 1089 | cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL); |
| 1090 | if (!(++uniqueID & 0x00000000FFFFFFFFUL)) |
| 1091 | uniqueID += 16; |
| 1092 | lvhd->uniqueID = cpu_to_le64(uniqueID); |
| 1093 | mark_buffer_dirty(UDF_SB_LVIDBH(inode->i_sb)); |
| 1094 | } |
| 1095 | udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); |
| 1096 | if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) |
| 1097 | { |
| 1098 | mark_inode_dirty(dir); |
| 1099 | } |
| 1100 | if (fibh.sbh != fibh.ebh) |
| 1101 | udf_release_data(fibh.ebh); |
| 1102 | udf_release_data(fibh.sbh); |
| 1103 | d_instantiate(dentry, inode); |
| 1104 | err = 0; |
| 1105 | |
| 1106 | out: |
| 1107 | unlock_kernel(); |
| 1108 | return err; |
| 1109 | |
| 1110 | out_no_entry: |
| 1111 | inode->i_nlink--; |
| 1112 | mark_inode_dirty(inode); |
| 1113 | iput(inode); |
| 1114 | goto out; |
| 1115 | } |
| 1116 | |
| 1117 | static int udf_link(struct dentry * old_dentry, struct inode * dir, |
| 1118 | struct dentry *dentry) |
| 1119 | { |
| 1120 | struct inode *inode = old_dentry->d_inode; |
| 1121 | struct udf_fileident_bh fibh; |
| 1122 | struct fileIdentDesc cfi, *fi; |
| 1123 | int err; |
| 1124 | |
| 1125 | lock_kernel(); |
| 1126 | if (inode->i_nlink >= (256<<sizeof(inode->i_nlink))-1) |
| 1127 | { |
| 1128 | unlock_kernel(); |
| 1129 | return -EMLINK; |
| 1130 | } |
| 1131 | |
| 1132 | if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err))) |
| 1133 | { |
| 1134 | unlock_kernel(); |
| 1135 | return err; |
| 1136 | } |
| 1137 | cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); |
| 1138 | cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode)); |
| 1139 | if (UDF_SB_LVIDBH(inode->i_sb)) |
| 1140 | { |
| 1141 | struct logicalVolHeaderDesc *lvhd; |
| 1142 | uint64_t uniqueID; |
| 1143 | lvhd = (struct logicalVolHeaderDesc *)(UDF_SB_LVID(inode->i_sb)->logicalVolContentsUse); |
| 1144 | uniqueID = le64_to_cpu(lvhd->uniqueID); |
| 1145 | *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = |
| 1146 | cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL); |
| 1147 | if (!(++uniqueID & 0x00000000FFFFFFFFUL)) |
| 1148 | uniqueID += 16; |
| 1149 | lvhd->uniqueID = cpu_to_le64(uniqueID); |
| 1150 | mark_buffer_dirty(UDF_SB_LVIDBH(inode->i_sb)); |
| 1151 | } |
| 1152 | udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); |
| 1153 | if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) |
| 1154 | { |
| 1155 | mark_inode_dirty(dir); |
| 1156 | } |
| 1157 | if (fibh.sbh != fibh.ebh) |
| 1158 | udf_release_data(fibh.ebh); |
| 1159 | udf_release_data(fibh.sbh); |
| 1160 | inode->i_nlink ++; |
| 1161 | inode->i_ctime = current_fs_time(inode->i_sb); |
| 1162 | mark_inode_dirty(inode); |
| 1163 | atomic_inc(&inode->i_count); |
| 1164 | d_instantiate(dentry, inode); |
| 1165 | unlock_kernel(); |
| 1166 | return 0; |
| 1167 | } |
| 1168 | |
| 1169 | /* Anybody can rename anything with this: the permission checks are left to the |
| 1170 | * higher-level routines. |
| 1171 | */ |
| 1172 | static int udf_rename (struct inode * old_dir, struct dentry * old_dentry, |
| 1173 | struct inode * new_dir, struct dentry * new_dentry) |
| 1174 | { |
| 1175 | struct inode * old_inode = old_dentry->d_inode; |
| 1176 | struct inode * new_inode = new_dentry->d_inode; |
| 1177 | struct udf_fileident_bh ofibh, nfibh; |
| 1178 | struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL, ocfi, ncfi; |
| 1179 | struct buffer_head *dir_bh = NULL; |
| 1180 | int retval = -ENOENT; |
| 1181 | kernel_lb_addr tloc; |
| 1182 | |
| 1183 | lock_kernel(); |
| 1184 | if ((ofi = udf_find_entry(old_dir, old_dentry, &ofibh, &ocfi))) |
| 1185 | { |
| 1186 | if (ofibh.sbh != ofibh.ebh) |
| 1187 | udf_release_data(ofibh.ebh); |
| 1188 | udf_release_data(ofibh.sbh); |
| 1189 | } |
| 1190 | tloc = lelb_to_cpu(ocfi.icb.extLocation); |
| 1191 | if (!ofi || udf_get_lb_pblock(old_dir->i_sb, tloc, 0) |
| 1192 | != old_inode->i_ino) |
| 1193 | goto end_rename; |
| 1194 | |
| 1195 | nfi = udf_find_entry(new_dir, new_dentry, &nfibh, &ncfi); |
| 1196 | if (nfi) |
| 1197 | { |
| 1198 | if (!new_inode) |
| 1199 | { |
| 1200 | if (nfibh.sbh != nfibh.ebh) |
| 1201 | udf_release_data(nfibh.ebh); |
| 1202 | udf_release_data(nfibh.sbh); |
| 1203 | nfi = NULL; |
| 1204 | } |
| 1205 | } |
| 1206 | if (S_ISDIR(old_inode->i_mode)) |
| 1207 | { |
| 1208 | uint32_t offset = udf_ext0_offset(old_inode); |
| 1209 | |
| 1210 | if (new_inode) |
| 1211 | { |
| 1212 | retval = -ENOTEMPTY; |
| 1213 | if (!empty_dir(new_inode)) |
| 1214 | goto end_rename; |
| 1215 | } |
| 1216 | retval = -EIO; |
| 1217 | if (UDF_I_ALLOCTYPE(old_inode) == ICBTAG_FLAG_AD_IN_ICB) |
| 1218 | { |
| 1219 | dir_fi = udf_get_fileident(UDF_I_DATA(old_inode) - |
| 1220 | (UDF_I_EFE(old_inode) ? |
| 1221 | sizeof(struct extendedFileEntry) : |
| 1222 | sizeof(struct fileEntry)), |
| 1223 | old_inode->i_sb->s_blocksize, &offset); |
| 1224 | } |
| 1225 | else |
| 1226 | { |
| 1227 | dir_bh = udf_bread(old_inode, 0, 0, &retval); |
| 1228 | if (!dir_bh) |
| 1229 | goto end_rename; |
| 1230 | dir_fi = udf_get_fileident(dir_bh->b_data, old_inode->i_sb->s_blocksize, &offset); |
| 1231 | } |
| 1232 | if (!dir_fi) |
| 1233 | goto end_rename; |
| 1234 | tloc = lelb_to_cpu(dir_fi->icb.extLocation); |
| 1235 | if (udf_get_lb_pblock(old_inode->i_sb, tloc, 0) |
| 1236 | != old_dir->i_ino) |
| 1237 | goto end_rename; |
| 1238 | |
| 1239 | retval = -EMLINK; |
| 1240 | if (!new_inode && new_dir->i_nlink >= (256<<sizeof(new_dir->i_nlink))-1) |
| 1241 | goto end_rename; |
| 1242 | } |
| 1243 | if (!nfi) |
| 1244 | { |
| 1245 | nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi, &retval); |
| 1246 | if (!nfi) |
| 1247 | goto end_rename; |
| 1248 | } |
| 1249 | |
| 1250 | /* |
| 1251 | * Like most other Unix systems, set the ctime for inodes on a |
| 1252 | * rename. |
| 1253 | */ |
| 1254 | old_inode->i_ctime = current_fs_time(old_inode->i_sb); |
| 1255 | mark_inode_dirty(old_inode); |
| 1256 | |
| 1257 | /* |
| 1258 | * ok, that's it |
| 1259 | */ |
| 1260 | ncfi.fileVersionNum = ocfi.fileVersionNum; |
| 1261 | ncfi.fileCharacteristics = ocfi.fileCharacteristics; |
| 1262 | memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(long_ad)); |
| 1263 | udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL); |
| 1264 | |
| 1265 | /* The old fid may have moved - find it again */ |
| 1266 | ofi = udf_find_entry(old_dir, old_dentry, &ofibh, &ocfi); |
| 1267 | udf_delete_entry(old_dir, ofi, &ofibh, &ocfi); |
| 1268 | |
| 1269 | if (new_inode) |
| 1270 | { |
| 1271 | new_inode->i_nlink--; |
| 1272 | new_inode->i_ctime = current_fs_time(new_inode->i_sb); |
| 1273 | mark_inode_dirty(new_inode); |
| 1274 | } |
| 1275 | old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb); |
| 1276 | mark_inode_dirty(old_dir); |
| 1277 | |
| 1278 | if (dir_fi) |
| 1279 | { |
| 1280 | dir_fi->icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(new_dir)); |
| 1281 | udf_update_tag((char *)dir_fi, (sizeof(struct fileIdentDesc) + |
| 1282 | le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3); |
| 1283 | if (UDF_I_ALLOCTYPE(old_inode) == ICBTAG_FLAG_AD_IN_ICB) |
| 1284 | { |
| 1285 | mark_inode_dirty(old_inode); |
| 1286 | } |
| 1287 | else |
| 1288 | mark_buffer_dirty_inode(dir_bh, old_inode); |
| 1289 | old_dir->i_nlink --; |
| 1290 | mark_inode_dirty(old_dir); |
| 1291 | if (new_inode) |
| 1292 | { |
| 1293 | new_inode->i_nlink --; |
| 1294 | mark_inode_dirty(new_inode); |
| 1295 | } |
| 1296 | else |
| 1297 | { |
| 1298 | new_dir->i_nlink ++; |
| 1299 | mark_inode_dirty(new_dir); |
| 1300 | } |
| 1301 | } |
| 1302 | |
| 1303 | if (ofi) |
| 1304 | { |
| 1305 | if (ofibh.sbh != ofibh.ebh) |
| 1306 | udf_release_data(ofibh.ebh); |
| 1307 | udf_release_data(ofibh.sbh); |
| 1308 | } |
| 1309 | |
| 1310 | retval = 0; |
| 1311 | |
| 1312 | end_rename: |
| 1313 | udf_release_data(dir_bh); |
| 1314 | if (nfi) |
| 1315 | { |
| 1316 | if (nfibh.sbh != nfibh.ebh) |
| 1317 | udf_release_data(nfibh.ebh); |
| 1318 | udf_release_data(nfibh.sbh); |
| 1319 | } |
| 1320 | unlock_kernel(); |
| 1321 | return retval; |
| 1322 | } |
| 1323 | |
| 1324 | struct inode_operations udf_dir_inode_operations = { |
| 1325 | .lookup = udf_lookup, |
| 1326 | .create = udf_create, |
| 1327 | .link = udf_link, |
| 1328 | .unlink = udf_unlink, |
| 1329 | .symlink = udf_symlink, |
| 1330 | .mkdir = udf_mkdir, |
| 1331 | .rmdir = udf_rmdir, |
| 1332 | .mknod = udf_mknod, |
| 1333 | .rename = udf_rename, |
| 1334 | }; |