| 1 | /* |
| 2 | * namei.c |
| 3 | * |
| 4 | * PURPOSE |
| 5 | * Inode name handling routines for the OSTA-UDF(tm) filesystem. |
| 6 | * |
| 7 | * COPYRIGHT |
| 8 | * This file is distributed under the terms of the GNU General Public |
| 9 | * License (GPL). Copies of the GPL can be obtained from: |
| 10 | * ftp://prep.ai.mit.edu/pub/gnu/GPL |
| 11 | * Each contributing author retains all rights to their own work. |
| 12 | * |
| 13 | * (C) 1998-2004 Ben Fennema |
| 14 | * (C) 1999-2000 Stelias Computing Inc |
| 15 | * |
| 16 | * HISTORY |
| 17 | * |
| 18 | * 12/12/98 blf Created. Split out the lookup code from dir.c |
| 19 | * 04/19/99 blf link, mknod, symlink support |
| 20 | */ |
| 21 | |
| 22 | #include "udfdecl.h" |
| 23 | |
| 24 | #include "udf_i.h" |
| 25 | #include "udf_sb.h" |
| 26 | #include <linux/string.h> |
| 27 | #include <linux/errno.h> |
| 28 | #include <linux/mm.h> |
| 29 | #include <linux/slab.h> |
| 30 | #include <linux/sched.h> |
| 31 | #include <linux/crc-itu-t.h> |
| 32 | #include <linux/exportfs.h> |
| 33 | |
| 34 | static inline int udf_match(int len1, const unsigned char *name1, int len2, |
| 35 | const unsigned char *name2) |
| 36 | { |
| 37 | if (len1 != len2) |
| 38 | return 0; |
| 39 | |
| 40 | return !memcmp(name1, name2, len1); |
| 41 | } |
| 42 | |
| 43 | int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi, |
| 44 | struct fileIdentDesc *sfi, struct udf_fileident_bh *fibh, |
| 45 | uint8_t *impuse, uint8_t *fileident) |
| 46 | { |
| 47 | uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(struct tag); |
| 48 | uint16_t crc; |
| 49 | int offset; |
| 50 | uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse); |
| 51 | uint8_t lfi = cfi->lengthFileIdent; |
| 52 | int padlen = fibh->eoffset - fibh->soffset - liu - lfi - |
| 53 | sizeof(struct fileIdentDesc); |
| 54 | int adinicb = 0; |
| 55 | |
| 56 | if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) |
| 57 | adinicb = 1; |
| 58 | |
| 59 | offset = fibh->soffset + sizeof(struct fileIdentDesc); |
| 60 | |
| 61 | if (impuse) { |
| 62 | if (adinicb || (offset + liu < 0)) { |
| 63 | memcpy((uint8_t *)sfi->impUse, impuse, liu); |
| 64 | } else if (offset >= 0) { |
| 65 | memcpy(fibh->ebh->b_data + offset, impuse, liu); |
| 66 | } else { |
| 67 | memcpy((uint8_t *)sfi->impUse, impuse, -offset); |
| 68 | memcpy(fibh->ebh->b_data, impuse - offset, |
| 69 | liu + offset); |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | offset += liu; |
| 74 | |
| 75 | if (fileident) { |
| 76 | if (adinicb || (offset + lfi < 0)) { |
| 77 | memcpy((uint8_t *)sfi->fileIdent + liu, fileident, lfi); |
| 78 | } else if (offset >= 0) { |
| 79 | memcpy(fibh->ebh->b_data + offset, fileident, lfi); |
| 80 | } else { |
| 81 | memcpy((uint8_t *)sfi->fileIdent + liu, fileident, |
| 82 | -offset); |
| 83 | memcpy(fibh->ebh->b_data, fileident - offset, |
| 84 | lfi + offset); |
| 85 | } |
| 86 | } |
| 87 | |
| 88 | offset += lfi; |
| 89 | |
| 90 | if (adinicb || (offset + padlen < 0)) { |
| 91 | memset((uint8_t *)sfi->padding + liu + lfi, 0x00, padlen); |
| 92 | } else if (offset >= 0) { |
| 93 | memset(fibh->ebh->b_data + offset, 0x00, padlen); |
| 94 | } else { |
| 95 | memset((uint8_t *)sfi->padding + liu + lfi, 0x00, -offset); |
| 96 | memset(fibh->ebh->b_data, 0x00, padlen + offset); |
| 97 | } |
| 98 | |
| 99 | crc = crc_itu_t(0, (uint8_t *)cfi + sizeof(struct tag), |
| 100 | sizeof(struct fileIdentDesc) - sizeof(struct tag)); |
| 101 | |
| 102 | if (fibh->sbh == fibh->ebh) { |
| 103 | crc = crc_itu_t(crc, (uint8_t *)sfi->impUse, |
| 104 | crclen + sizeof(struct tag) - |
| 105 | sizeof(struct fileIdentDesc)); |
| 106 | } else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) { |
| 107 | crc = crc_itu_t(crc, fibh->ebh->b_data + |
| 108 | sizeof(struct fileIdentDesc) + |
| 109 | fibh->soffset, |
| 110 | crclen + sizeof(struct tag) - |
| 111 | sizeof(struct fileIdentDesc)); |
| 112 | } else { |
| 113 | crc = crc_itu_t(crc, (uint8_t *)sfi->impUse, |
| 114 | -fibh->soffset - sizeof(struct fileIdentDesc)); |
| 115 | crc = crc_itu_t(crc, fibh->ebh->b_data, fibh->eoffset); |
| 116 | } |
| 117 | |
| 118 | cfi->descTag.descCRC = cpu_to_le16(crc); |
| 119 | cfi->descTag.descCRCLength = cpu_to_le16(crclen); |
| 120 | cfi->descTag.tagChecksum = udf_tag_checksum(&cfi->descTag); |
| 121 | |
| 122 | if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset)) { |
| 123 | memcpy((uint8_t *)sfi, (uint8_t *)cfi, |
| 124 | sizeof(struct fileIdentDesc)); |
| 125 | } else { |
| 126 | memcpy((uint8_t *)sfi, (uint8_t *)cfi, -fibh->soffset); |
| 127 | memcpy(fibh->ebh->b_data, (uint8_t *)cfi - fibh->soffset, |
| 128 | sizeof(struct fileIdentDesc) + fibh->soffset); |
| 129 | } |
| 130 | |
| 131 | if (adinicb) { |
| 132 | mark_inode_dirty(inode); |
| 133 | } else { |
| 134 | if (fibh->sbh != fibh->ebh) |
| 135 | mark_buffer_dirty_inode(fibh->ebh, inode); |
| 136 | mark_buffer_dirty_inode(fibh->sbh, inode); |
| 137 | } |
| 138 | return 0; |
| 139 | } |
| 140 | |
| 141 | /** |
| 142 | * udf_find_entry - find entry in given directory. |
| 143 | * |
| 144 | * @dir: directory inode to search in |
| 145 | * @child: qstr of the name |
| 146 | * @fibh: buffer head / inode with file identifier descriptor we found |
| 147 | * @cfi: found file identifier descriptor with given name |
| 148 | * |
| 149 | * This function searches in the directory @dir for a file name @child. When |
| 150 | * found, @fibh points to the buffer head(s) (bh is NULL for in ICB |
| 151 | * directories) containing the file identifier descriptor (FID). In that case |
| 152 | * the function returns pointer to the FID in the buffer or inode - but note |
| 153 | * that FID may be split among two buffers (blocks) so accessing it via that |
| 154 | * pointer isn't easily possible. This pointer can be used only as an iterator |
| 155 | * for other directory manipulation functions. For inspection of the FID @cfi |
| 156 | * can be used - the found FID is copied there. |
| 157 | * |
| 158 | * Returns pointer to FID, NULL when nothing found, or error code. |
| 159 | */ |
| 160 | static struct fileIdentDesc *udf_find_entry(struct inode *dir, |
| 161 | const struct qstr *child, |
| 162 | struct udf_fileident_bh *fibh, |
| 163 | struct fileIdentDesc *cfi) |
| 164 | { |
| 165 | struct fileIdentDesc *fi = NULL; |
| 166 | loff_t f_pos; |
| 167 | int block, flen; |
| 168 | unsigned char *fname = NULL, *copy_name = NULL; |
| 169 | unsigned char *nameptr; |
| 170 | uint8_t lfi; |
| 171 | uint16_t liu; |
| 172 | loff_t size; |
| 173 | struct kernel_lb_addr eloc; |
| 174 | uint32_t elen; |
| 175 | sector_t offset; |
| 176 | struct extent_position epos = {}; |
| 177 | struct udf_inode_info *dinfo = UDF_I(dir); |
| 178 | int isdotdot = child->len == 2 && |
| 179 | child->name[0] == '.' && child->name[1] == '.'; |
| 180 | struct super_block *sb = dir->i_sb; |
| 181 | |
| 182 | size = udf_ext0_offset(dir) + dir->i_size; |
| 183 | f_pos = udf_ext0_offset(dir); |
| 184 | |
| 185 | fibh->sbh = fibh->ebh = NULL; |
| 186 | fibh->soffset = fibh->eoffset = f_pos & (sb->s_blocksize - 1); |
| 187 | if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { |
| 188 | if (inode_bmap(dir, f_pos >> sb->s_blocksize_bits, &epos, |
| 189 | &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) { |
| 190 | fi = ERR_PTR(-EIO); |
| 191 | goto out_err; |
| 192 | } |
| 193 | |
| 194 | block = udf_get_lb_pblock(sb, &eloc, offset); |
| 195 | if ((++offset << sb->s_blocksize_bits) < elen) { |
| 196 | if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) |
| 197 | epos.offset -= sizeof(struct short_ad); |
| 198 | else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) |
| 199 | epos.offset -= sizeof(struct long_ad); |
| 200 | } else |
| 201 | offset = 0; |
| 202 | |
| 203 | fibh->sbh = fibh->ebh = udf_tread(sb, block); |
| 204 | if (!fibh->sbh) { |
| 205 | fi = ERR_PTR(-EIO); |
| 206 | goto out_err; |
| 207 | } |
| 208 | } |
| 209 | |
| 210 | fname = kmalloc(UDF_NAME_LEN, GFP_NOFS); |
| 211 | if (!fname) { |
| 212 | fi = ERR_PTR(-ENOMEM); |
| 213 | goto out_err; |
| 214 | } |
| 215 | |
| 216 | while (f_pos < size) { |
| 217 | fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc, |
| 218 | &elen, &offset); |
| 219 | if (!fi) { |
| 220 | fi = ERR_PTR(-EIO); |
| 221 | goto out_err; |
| 222 | } |
| 223 | |
| 224 | liu = le16_to_cpu(cfi->lengthOfImpUse); |
| 225 | lfi = cfi->lengthFileIdent; |
| 226 | |
| 227 | if (fibh->sbh == fibh->ebh) { |
| 228 | nameptr = fi->fileIdent + liu; |
| 229 | } else { |
| 230 | int poffset; /* Unpaded ending offset */ |
| 231 | |
| 232 | poffset = fibh->soffset + sizeof(struct fileIdentDesc) + |
| 233 | liu + lfi; |
| 234 | |
| 235 | if (poffset >= lfi) |
| 236 | nameptr = (uint8_t *)(fibh->ebh->b_data + |
| 237 | poffset - lfi); |
| 238 | else { |
| 239 | if (!copy_name) { |
| 240 | copy_name = kmalloc(UDF_NAME_LEN, |
| 241 | GFP_NOFS); |
| 242 | if (!copy_name) { |
| 243 | fi = ERR_PTR(-ENOMEM); |
| 244 | goto out_err; |
| 245 | } |
| 246 | } |
| 247 | nameptr = copy_name; |
| 248 | memcpy(nameptr, fi->fileIdent + liu, |
| 249 | lfi - poffset); |
| 250 | memcpy(nameptr + lfi - poffset, |
| 251 | fibh->ebh->b_data, poffset); |
| 252 | } |
| 253 | } |
| 254 | |
| 255 | if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) { |
| 256 | if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE)) |
| 257 | continue; |
| 258 | } |
| 259 | |
| 260 | if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) { |
| 261 | if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE)) |
| 262 | continue; |
| 263 | } |
| 264 | |
| 265 | if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) && |
| 266 | isdotdot) |
| 267 | goto out_ok; |
| 268 | |
| 269 | if (!lfi) |
| 270 | continue; |
| 271 | |
| 272 | flen = udf_get_filename(sb, nameptr, lfi, fname, UDF_NAME_LEN); |
| 273 | if (flen < 0) { |
| 274 | fi = ERR_PTR(flen); |
| 275 | goto out_err; |
| 276 | } |
| 277 | |
| 278 | if (udf_match(flen, fname, child->len, child->name)) |
| 279 | goto out_ok; |
| 280 | } |
| 281 | |
| 282 | fi = NULL; |
| 283 | out_err: |
| 284 | if (fibh->sbh != fibh->ebh) |
| 285 | brelse(fibh->ebh); |
| 286 | brelse(fibh->sbh); |
| 287 | out_ok: |
| 288 | brelse(epos.bh); |
| 289 | kfree(fname); |
| 290 | kfree(copy_name); |
| 291 | |
| 292 | return fi; |
| 293 | } |
| 294 | |
| 295 | static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry, |
| 296 | unsigned int flags) |
| 297 | { |
| 298 | struct inode *inode = NULL; |
| 299 | struct fileIdentDesc cfi; |
| 300 | struct udf_fileident_bh fibh; |
| 301 | struct fileIdentDesc *fi; |
| 302 | |
| 303 | if (dentry->d_name.len > UDF_NAME_LEN) |
| 304 | return ERR_PTR(-ENAMETOOLONG); |
| 305 | |
| 306 | #ifdef UDF_RECOVERY |
| 307 | /* temporary shorthand for specifying files by inode number */ |
| 308 | if (!strncmp(dentry->d_name.name, ".B=", 3)) { |
| 309 | struct kernel_lb_addr lb = { |
| 310 | .logicalBlockNum = 0, |
| 311 | .partitionReferenceNum = |
| 312 | simple_strtoul(dentry->d_name.name + 3, |
| 313 | NULL, 0), |
| 314 | }; |
| 315 | inode = udf_iget(dir->i_sb, lb); |
| 316 | if (IS_ERR(inode)) |
| 317 | return inode; |
| 318 | } else |
| 319 | #endif /* UDF_RECOVERY */ |
| 320 | |
| 321 | fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi); |
| 322 | if (IS_ERR(fi)) |
| 323 | return ERR_CAST(fi); |
| 324 | |
| 325 | if (fi) { |
| 326 | struct kernel_lb_addr loc; |
| 327 | |
| 328 | if (fibh.sbh != fibh.ebh) |
| 329 | brelse(fibh.ebh); |
| 330 | brelse(fibh.sbh); |
| 331 | |
| 332 | loc = lelb_to_cpu(cfi.icb.extLocation); |
| 333 | inode = udf_iget(dir->i_sb, &loc); |
| 334 | if (IS_ERR(inode)) |
| 335 | return ERR_CAST(inode); |
| 336 | } |
| 337 | |
| 338 | return d_splice_alias(inode, dentry); |
| 339 | } |
| 340 | |
| 341 | static struct fileIdentDesc *udf_add_entry(struct inode *dir, |
| 342 | struct dentry *dentry, |
| 343 | struct udf_fileident_bh *fibh, |
| 344 | struct fileIdentDesc *cfi, int *err) |
| 345 | { |
| 346 | struct super_block *sb = dir->i_sb; |
| 347 | struct fileIdentDesc *fi = NULL; |
| 348 | unsigned char *name = NULL; |
| 349 | int namelen; |
| 350 | loff_t f_pos; |
| 351 | loff_t size = udf_ext0_offset(dir) + dir->i_size; |
| 352 | int nfidlen; |
| 353 | uint8_t lfi; |
| 354 | uint16_t liu; |
| 355 | int block; |
| 356 | struct kernel_lb_addr eloc; |
| 357 | uint32_t elen = 0; |
| 358 | sector_t offset; |
| 359 | struct extent_position epos = {}; |
| 360 | struct udf_inode_info *dinfo; |
| 361 | |
| 362 | fibh->sbh = fibh->ebh = NULL; |
| 363 | name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS); |
| 364 | if (!name) { |
| 365 | *err = -ENOMEM; |
| 366 | goto out_err; |
| 367 | } |
| 368 | |
| 369 | if (dentry) { |
| 370 | if (!dentry->d_name.len) { |
| 371 | *err = -EINVAL; |
| 372 | goto out_err; |
| 373 | } |
| 374 | namelen = udf_put_filename(sb, dentry->d_name.name, |
| 375 | dentry->d_name.len, |
| 376 | name, UDF_NAME_LEN_CS0); |
| 377 | if (!namelen) { |
| 378 | *err = -ENAMETOOLONG; |
| 379 | goto out_err; |
| 380 | } |
| 381 | } else { |
| 382 | namelen = 0; |
| 383 | } |
| 384 | |
| 385 | nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3; |
| 386 | |
| 387 | f_pos = udf_ext0_offset(dir); |
| 388 | |
| 389 | fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1); |
| 390 | dinfo = UDF_I(dir); |
| 391 | if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { |
| 392 | if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos, |
| 393 | &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) { |
| 394 | block = udf_get_lb_pblock(dir->i_sb, |
| 395 | &dinfo->i_location, 0); |
| 396 | fibh->soffset = fibh->eoffset = sb->s_blocksize; |
| 397 | goto add; |
| 398 | } |
| 399 | block = udf_get_lb_pblock(dir->i_sb, &eloc, offset); |
| 400 | if ((++offset << dir->i_sb->s_blocksize_bits) < elen) { |
| 401 | if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) |
| 402 | epos.offset -= sizeof(struct short_ad); |
| 403 | else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) |
| 404 | epos.offset -= sizeof(struct long_ad); |
| 405 | } else |
| 406 | offset = 0; |
| 407 | |
| 408 | fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block); |
| 409 | if (!fibh->sbh) { |
| 410 | *err = -EIO; |
| 411 | goto out_err; |
| 412 | } |
| 413 | |
| 414 | block = dinfo->i_location.logicalBlockNum; |
| 415 | } |
| 416 | |
| 417 | while (f_pos < size) { |
| 418 | fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc, |
| 419 | &elen, &offset); |
| 420 | |
| 421 | if (!fi) { |
| 422 | *err = -EIO; |
| 423 | goto out_err; |
| 424 | } |
| 425 | |
| 426 | liu = le16_to_cpu(cfi->lengthOfImpUse); |
| 427 | lfi = cfi->lengthFileIdent; |
| 428 | |
| 429 | if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) { |
| 430 | if (((sizeof(struct fileIdentDesc) + |
| 431 | liu + lfi + 3) & ~3) == nfidlen) { |
| 432 | cfi->descTag.tagSerialNum = cpu_to_le16(1); |
| 433 | cfi->fileVersionNum = cpu_to_le16(1); |
| 434 | cfi->fileCharacteristics = 0; |
| 435 | cfi->lengthFileIdent = namelen; |
| 436 | cfi->lengthOfImpUse = cpu_to_le16(0); |
| 437 | if (!udf_write_fi(dir, cfi, fi, fibh, NULL, |
| 438 | name)) |
| 439 | goto out_ok; |
| 440 | else { |
| 441 | *err = -EIO; |
| 442 | goto out_err; |
| 443 | } |
| 444 | } |
| 445 | } |
| 446 | } |
| 447 | |
| 448 | add: |
| 449 | f_pos += nfidlen; |
| 450 | |
| 451 | if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB && |
| 452 | sb->s_blocksize - fibh->eoffset < nfidlen) { |
| 453 | brelse(epos.bh); |
| 454 | epos.bh = NULL; |
| 455 | fibh->soffset -= udf_ext0_offset(dir); |
| 456 | fibh->eoffset -= udf_ext0_offset(dir); |
| 457 | f_pos -= udf_ext0_offset(dir); |
| 458 | if (fibh->sbh != fibh->ebh) |
| 459 | brelse(fibh->ebh); |
| 460 | brelse(fibh->sbh); |
| 461 | fibh->sbh = fibh->ebh = |
| 462 | udf_expand_dir_adinicb(dir, &block, err); |
| 463 | if (!fibh->sbh) |
| 464 | goto out_err; |
| 465 | epos.block = dinfo->i_location; |
| 466 | epos.offset = udf_file_entry_alloc_offset(dir); |
| 467 | /* Load extent udf_expand_dir_adinicb() has created */ |
| 468 | udf_current_aext(dir, &epos, &eloc, &elen, 1); |
| 469 | } |
| 470 | |
| 471 | /* Entry fits into current block? */ |
| 472 | if (sb->s_blocksize - fibh->eoffset >= nfidlen) { |
| 473 | fibh->soffset = fibh->eoffset; |
| 474 | fibh->eoffset += nfidlen; |
| 475 | if (fibh->sbh != fibh->ebh) { |
| 476 | brelse(fibh->sbh); |
| 477 | fibh->sbh = fibh->ebh; |
| 478 | } |
| 479 | |
| 480 | if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { |
| 481 | block = dinfo->i_location.logicalBlockNum; |
| 482 | fi = (struct fileIdentDesc *) |
| 483 | (dinfo->i_ext.i_data + |
| 484 | fibh->soffset - |
| 485 | udf_ext0_offset(dir) + |
| 486 | dinfo->i_lenEAttr); |
| 487 | } else { |
| 488 | block = eloc.logicalBlockNum + |
| 489 | ((elen - 1) >> |
| 490 | dir->i_sb->s_blocksize_bits); |
| 491 | fi = (struct fileIdentDesc *) |
| 492 | (fibh->sbh->b_data + fibh->soffset); |
| 493 | } |
| 494 | } else { |
| 495 | /* Round up last extent in the file */ |
| 496 | elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1); |
| 497 | if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) |
| 498 | epos.offset -= sizeof(struct short_ad); |
| 499 | else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) |
| 500 | epos.offset -= sizeof(struct long_ad); |
| 501 | udf_write_aext(dir, &epos, &eloc, elen, 1); |
| 502 | dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize |
| 503 | - 1) & ~(sb->s_blocksize - 1); |
| 504 | |
| 505 | fibh->soffset = fibh->eoffset - sb->s_blocksize; |
| 506 | fibh->eoffset += nfidlen - sb->s_blocksize; |
| 507 | if (fibh->sbh != fibh->ebh) { |
| 508 | brelse(fibh->sbh); |
| 509 | fibh->sbh = fibh->ebh; |
| 510 | } |
| 511 | |
| 512 | block = eloc.logicalBlockNum + ((elen - 1) >> |
| 513 | dir->i_sb->s_blocksize_bits); |
| 514 | fibh->ebh = udf_bread(dir, |
| 515 | f_pos >> dir->i_sb->s_blocksize_bits, 1, err); |
| 516 | if (!fibh->ebh) |
| 517 | goto out_err; |
| 518 | /* Extents could have been merged, invalidate our position */ |
| 519 | brelse(epos.bh); |
| 520 | epos.bh = NULL; |
| 521 | epos.block = dinfo->i_location; |
| 522 | epos.offset = udf_file_entry_alloc_offset(dir); |
| 523 | |
| 524 | if (!fibh->soffset) { |
| 525 | /* Find the freshly allocated block */ |
| 526 | while (udf_next_aext(dir, &epos, &eloc, &elen, 1) == |
| 527 | (EXT_RECORDED_ALLOCATED >> 30)) |
| 528 | ; |
| 529 | block = eloc.logicalBlockNum + ((elen - 1) >> |
| 530 | dir->i_sb->s_blocksize_bits); |
| 531 | brelse(fibh->sbh); |
| 532 | fibh->sbh = fibh->ebh; |
| 533 | fi = (struct fileIdentDesc *)(fibh->sbh->b_data); |
| 534 | } else { |
| 535 | fi = (struct fileIdentDesc *) |
| 536 | (fibh->sbh->b_data + sb->s_blocksize + |
| 537 | fibh->soffset); |
| 538 | } |
| 539 | } |
| 540 | |
| 541 | memset(cfi, 0, sizeof(struct fileIdentDesc)); |
| 542 | if (UDF_SB(sb)->s_udfrev >= 0x0200) |
| 543 | udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block, |
| 544 | sizeof(struct tag)); |
| 545 | else |
| 546 | udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block, |
| 547 | sizeof(struct tag)); |
| 548 | cfi->fileVersionNum = cpu_to_le16(1); |
| 549 | cfi->lengthFileIdent = namelen; |
| 550 | cfi->lengthOfImpUse = cpu_to_le16(0); |
| 551 | if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) { |
| 552 | dir->i_size += nfidlen; |
| 553 | if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) |
| 554 | dinfo->i_lenAlloc += nfidlen; |
| 555 | else { |
| 556 | /* Find the last extent and truncate it to proper size */ |
| 557 | while (udf_next_aext(dir, &epos, &eloc, &elen, 1) == |
| 558 | (EXT_RECORDED_ALLOCATED >> 30)) |
| 559 | ; |
| 560 | elen -= dinfo->i_lenExtents - dir->i_size; |
| 561 | if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) |
| 562 | epos.offset -= sizeof(struct short_ad); |
| 563 | else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) |
| 564 | epos.offset -= sizeof(struct long_ad); |
| 565 | udf_write_aext(dir, &epos, &eloc, elen, 1); |
| 566 | dinfo->i_lenExtents = dir->i_size; |
| 567 | } |
| 568 | |
| 569 | mark_inode_dirty(dir); |
| 570 | goto out_ok; |
| 571 | } else { |
| 572 | *err = -EIO; |
| 573 | goto out_err; |
| 574 | } |
| 575 | |
| 576 | out_err: |
| 577 | fi = NULL; |
| 578 | if (fibh->sbh != fibh->ebh) |
| 579 | brelse(fibh->ebh); |
| 580 | brelse(fibh->sbh); |
| 581 | out_ok: |
| 582 | brelse(epos.bh); |
| 583 | kfree(name); |
| 584 | return fi; |
| 585 | } |
| 586 | |
| 587 | static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi, |
| 588 | struct udf_fileident_bh *fibh, |
| 589 | struct fileIdentDesc *cfi) |
| 590 | { |
| 591 | cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED; |
| 592 | |
| 593 | if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT)) |
| 594 | memset(&(cfi->icb), 0x00, sizeof(struct long_ad)); |
| 595 | |
| 596 | return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL); |
| 597 | } |
| 598 | |
| 599 | static int udf_add_nondir(struct dentry *dentry, struct inode *inode) |
| 600 | { |
| 601 | struct udf_inode_info *iinfo = UDF_I(inode); |
| 602 | struct inode *dir = d_inode(dentry->d_parent); |
| 603 | struct udf_fileident_bh fibh; |
| 604 | struct fileIdentDesc cfi, *fi; |
| 605 | int err; |
| 606 | |
| 607 | fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); |
| 608 | if (unlikely(!fi)) { |
| 609 | inode_dec_link_count(inode); |
| 610 | unlock_new_inode(inode); |
| 611 | iput(inode); |
| 612 | return err; |
| 613 | } |
| 614 | cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); |
| 615 | cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location); |
| 616 | *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = |
| 617 | cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); |
| 618 | udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); |
| 619 | dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb); |
| 620 | mark_inode_dirty(dir); |
| 621 | if (fibh.sbh != fibh.ebh) |
| 622 | brelse(fibh.ebh); |
| 623 | brelse(fibh.sbh); |
| 624 | unlock_new_inode(inode); |
| 625 | d_instantiate(dentry, inode); |
| 626 | |
| 627 | return 0; |
| 628 | } |
| 629 | |
| 630 | static int udf_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
| 631 | bool excl) |
| 632 | { |
| 633 | struct inode *inode = udf_new_inode(dir, mode); |
| 634 | |
| 635 | if (IS_ERR(inode)) |
| 636 | return PTR_ERR(inode); |
| 637 | |
| 638 | if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) |
| 639 | inode->i_data.a_ops = &udf_adinicb_aops; |
| 640 | else |
| 641 | inode->i_data.a_ops = &udf_aops; |
| 642 | inode->i_op = &udf_file_inode_operations; |
| 643 | inode->i_fop = &udf_file_operations; |
| 644 | mark_inode_dirty(inode); |
| 645 | |
| 646 | return udf_add_nondir(dentry, inode); |
| 647 | } |
| 648 | |
| 649 | static int udf_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode) |
| 650 | { |
| 651 | struct inode *inode = udf_new_inode(dir, mode); |
| 652 | |
| 653 | if (IS_ERR(inode)) |
| 654 | return PTR_ERR(inode); |
| 655 | |
| 656 | if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) |
| 657 | inode->i_data.a_ops = &udf_adinicb_aops; |
| 658 | else |
| 659 | inode->i_data.a_ops = &udf_aops; |
| 660 | inode->i_op = &udf_file_inode_operations; |
| 661 | inode->i_fop = &udf_file_operations; |
| 662 | mark_inode_dirty(inode); |
| 663 | d_tmpfile(dentry, inode); |
| 664 | unlock_new_inode(inode); |
| 665 | return 0; |
| 666 | } |
| 667 | |
| 668 | static int udf_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, |
| 669 | dev_t rdev) |
| 670 | { |
| 671 | struct inode *inode; |
| 672 | |
| 673 | if (!old_valid_dev(rdev)) |
| 674 | return -EINVAL; |
| 675 | |
| 676 | inode = udf_new_inode(dir, mode); |
| 677 | if (IS_ERR(inode)) |
| 678 | return PTR_ERR(inode); |
| 679 | |
| 680 | init_special_inode(inode, mode, rdev); |
| 681 | return udf_add_nondir(dentry, inode); |
| 682 | } |
| 683 | |
| 684 | static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
| 685 | { |
| 686 | struct inode *inode; |
| 687 | struct udf_fileident_bh fibh; |
| 688 | struct fileIdentDesc cfi, *fi; |
| 689 | int err; |
| 690 | struct udf_inode_info *dinfo = UDF_I(dir); |
| 691 | struct udf_inode_info *iinfo; |
| 692 | |
| 693 | inode = udf_new_inode(dir, S_IFDIR | mode); |
| 694 | if (IS_ERR(inode)) |
| 695 | return PTR_ERR(inode); |
| 696 | |
| 697 | iinfo = UDF_I(inode); |
| 698 | inode->i_op = &udf_dir_inode_operations; |
| 699 | inode->i_fop = &udf_dir_operations; |
| 700 | fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err); |
| 701 | if (!fi) { |
| 702 | inode_dec_link_count(inode); |
| 703 | unlock_new_inode(inode); |
| 704 | iput(inode); |
| 705 | goto out; |
| 706 | } |
| 707 | set_nlink(inode, 2); |
| 708 | cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); |
| 709 | cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location); |
| 710 | *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = |
| 711 | cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL); |
| 712 | cfi.fileCharacteristics = |
| 713 | FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT; |
| 714 | udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL); |
| 715 | brelse(fibh.sbh); |
| 716 | mark_inode_dirty(inode); |
| 717 | |
| 718 | fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); |
| 719 | if (!fi) { |
| 720 | clear_nlink(inode); |
| 721 | mark_inode_dirty(inode); |
| 722 | unlock_new_inode(inode); |
| 723 | iput(inode); |
| 724 | goto out; |
| 725 | } |
| 726 | cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); |
| 727 | cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location); |
| 728 | *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = |
| 729 | cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); |
| 730 | cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY; |
| 731 | udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); |
| 732 | inc_nlink(dir); |
| 733 | dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb); |
| 734 | mark_inode_dirty(dir); |
| 735 | unlock_new_inode(inode); |
| 736 | d_instantiate(dentry, inode); |
| 737 | if (fibh.sbh != fibh.ebh) |
| 738 | brelse(fibh.ebh); |
| 739 | brelse(fibh.sbh); |
| 740 | err = 0; |
| 741 | |
| 742 | out: |
| 743 | return err; |
| 744 | } |
| 745 | |
| 746 | static int empty_dir(struct inode *dir) |
| 747 | { |
| 748 | struct fileIdentDesc *fi, cfi; |
| 749 | struct udf_fileident_bh fibh; |
| 750 | loff_t f_pos; |
| 751 | loff_t size = udf_ext0_offset(dir) + dir->i_size; |
| 752 | int block; |
| 753 | struct kernel_lb_addr eloc; |
| 754 | uint32_t elen; |
| 755 | sector_t offset; |
| 756 | struct extent_position epos = {}; |
| 757 | struct udf_inode_info *dinfo = UDF_I(dir); |
| 758 | |
| 759 | f_pos = udf_ext0_offset(dir); |
| 760 | fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1); |
| 761 | |
| 762 | if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) |
| 763 | fibh.sbh = fibh.ebh = NULL; |
| 764 | else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, |
| 765 | &epos, &eloc, &elen, &offset) == |
| 766 | (EXT_RECORDED_ALLOCATED >> 30)) { |
| 767 | block = udf_get_lb_pblock(dir->i_sb, &eloc, offset); |
| 768 | if ((++offset << dir->i_sb->s_blocksize_bits) < elen) { |
| 769 | if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) |
| 770 | epos.offset -= sizeof(struct short_ad); |
| 771 | else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) |
| 772 | epos.offset -= sizeof(struct long_ad); |
| 773 | } else |
| 774 | offset = 0; |
| 775 | |
| 776 | fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block); |
| 777 | if (!fibh.sbh) { |
| 778 | brelse(epos.bh); |
| 779 | return 0; |
| 780 | } |
| 781 | } else { |
| 782 | brelse(epos.bh); |
| 783 | return 0; |
| 784 | } |
| 785 | |
| 786 | while (f_pos < size) { |
| 787 | fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc, |
| 788 | &elen, &offset); |
| 789 | if (!fi) { |
| 790 | if (fibh.sbh != fibh.ebh) |
| 791 | brelse(fibh.ebh); |
| 792 | brelse(fibh.sbh); |
| 793 | brelse(epos.bh); |
| 794 | return 0; |
| 795 | } |
| 796 | |
| 797 | if (cfi.lengthFileIdent && |
| 798 | (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) { |
| 799 | if (fibh.sbh != fibh.ebh) |
| 800 | brelse(fibh.ebh); |
| 801 | brelse(fibh.sbh); |
| 802 | brelse(epos.bh); |
| 803 | return 0; |
| 804 | } |
| 805 | } |
| 806 | |
| 807 | if (fibh.sbh != fibh.ebh) |
| 808 | brelse(fibh.ebh); |
| 809 | brelse(fibh.sbh); |
| 810 | brelse(epos.bh); |
| 811 | |
| 812 | return 1; |
| 813 | } |
| 814 | |
| 815 | static int udf_rmdir(struct inode *dir, struct dentry *dentry) |
| 816 | { |
| 817 | int retval; |
| 818 | struct inode *inode = d_inode(dentry); |
| 819 | struct udf_fileident_bh fibh; |
| 820 | struct fileIdentDesc *fi, cfi; |
| 821 | struct kernel_lb_addr tloc; |
| 822 | |
| 823 | retval = -ENOENT; |
| 824 | fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi); |
| 825 | if (IS_ERR_OR_NULL(fi)) { |
| 826 | if (fi) |
| 827 | retval = PTR_ERR(fi); |
| 828 | goto out; |
| 829 | } |
| 830 | |
| 831 | retval = -EIO; |
| 832 | tloc = lelb_to_cpu(cfi.icb.extLocation); |
| 833 | if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) |
| 834 | goto end_rmdir; |
| 835 | retval = -ENOTEMPTY; |
| 836 | if (!empty_dir(inode)) |
| 837 | goto end_rmdir; |
| 838 | retval = udf_delete_entry(dir, fi, &fibh, &cfi); |
| 839 | if (retval) |
| 840 | goto end_rmdir; |
| 841 | if (inode->i_nlink != 2) |
| 842 | udf_warn(inode->i_sb, "empty directory has nlink != 2 (%d)\n", |
| 843 | inode->i_nlink); |
| 844 | clear_nlink(inode); |
| 845 | inode->i_size = 0; |
| 846 | inode_dec_link_count(dir); |
| 847 | inode->i_ctime = dir->i_ctime = dir->i_mtime = |
| 848 | current_fs_time(dir->i_sb); |
| 849 | mark_inode_dirty(dir); |
| 850 | |
| 851 | end_rmdir: |
| 852 | if (fibh.sbh != fibh.ebh) |
| 853 | brelse(fibh.ebh); |
| 854 | brelse(fibh.sbh); |
| 855 | |
| 856 | out: |
| 857 | return retval; |
| 858 | } |
| 859 | |
| 860 | static int udf_unlink(struct inode *dir, struct dentry *dentry) |
| 861 | { |
| 862 | int retval; |
| 863 | struct inode *inode = d_inode(dentry); |
| 864 | struct udf_fileident_bh fibh; |
| 865 | struct fileIdentDesc *fi; |
| 866 | struct fileIdentDesc cfi; |
| 867 | struct kernel_lb_addr tloc; |
| 868 | |
| 869 | retval = -ENOENT; |
| 870 | fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi); |
| 871 | |
| 872 | if (IS_ERR_OR_NULL(fi)) { |
| 873 | if (fi) |
| 874 | retval = PTR_ERR(fi); |
| 875 | goto out; |
| 876 | } |
| 877 | |
| 878 | retval = -EIO; |
| 879 | tloc = lelb_to_cpu(cfi.icb.extLocation); |
| 880 | if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) |
| 881 | goto end_unlink; |
| 882 | |
| 883 | if (!inode->i_nlink) { |
| 884 | udf_debug("Deleting nonexistent file (%lu), %d\n", |
| 885 | inode->i_ino, inode->i_nlink); |
| 886 | set_nlink(inode, 1); |
| 887 | } |
| 888 | retval = udf_delete_entry(dir, fi, &fibh, &cfi); |
| 889 | if (retval) |
| 890 | goto end_unlink; |
| 891 | dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb); |
| 892 | mark_inode_dirty(dir); |
| 893 | inode_dec_link_count(inode); |
| 894 | inode->i_ctime = dir->i_ctime; |
| 895 | retval = 0; |
| 896 | |
| 897 | end_unlink: |
| 898 | if (fibh.sbh != fibh.ebh) |
| 899 | brelse(fibh.ebh); |
| 900 | brelse(fibh.sbh); |
| 901 | |
| 902 | out: |
| 903 | return retval; |
| 904 | } |
| 905 | |
| 906 | static int udf_symlink(struct inode *dir, struct dentry *dentry, |
| 907 | const char *symname) |
| 908 | { |
| 909 | struct inode *inode = udf_new_inode(dir, S_IFLNK | S_IRWXUGO); |
| 910 | struct pathComponent *pc; |
| 911 | const char *compstart; |
| 912 | struct extent_position epos = {}; |
| 913 | int eoffset, elen = 0; |
| 914 | uint8_t *ea; |
| 915 | int err; |
| 916 | int block; |
| 917 | unsigned char *name = NULL; |
| 918 | int namelen; |
| 919 | struct udf_inode_info *iinfo; |
| 920 | struct super_block *sb = dir->i_sb; |
| 921 | |
| 922 | if (IS_ERR(inode)) |
| 923 | return PTR_ERR(inode); |
| 924 | |
| 925 | iinfo = UDF_I(inode); |
| 926 | down_write(&iinfo->i_data_sem); |
| 927 | name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS); |
| 928 | if (!name) { |
| 929 | err = -ENOMEM; |
| 930 | goto out_no_entry; |
| 931 | } |
| 932 | |
| 933 | inode->i_data.a_ops = &udf_symlink_aops; |
| 934 | inode->i_op = &page_symlink_inode_operations; |
| 935 | inode_nohighmem(inode); |
| 936 | |
| 937 | if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { |
| 938 | struct kernel_lb_addr eloc; |
| 939 | uint32_t bsize; |
| 940 | |
| 941 | block = udf_new_block(sb, inode, |
| 942 | iinfo->i_location.partitionReferenceNum, |
| 943 | iinfo->i_location.logicalBlockNum, &err); |
| 944 | if (!block) |
| 945 | goto out_no_entry; |
| 946 | epos.block = iinfo->i_location; |
| 947 | epos.offset = udf_file_entry_alloc_offset(inode); |
| 948 | epos.bh = NULL; |
| 949 | eloc.logicalBlockNum = block; |
| 950 | eloc.partitionReferenceNum = |
| 951 | iinfo->i_location.partitionReferenceNum; |
| 952 | bsize = sb->s_blocksize; |
| 953 | iinfo->i_lenExtents = bsize; |
| 954 | udf_add_aext(inode, &epos, &eloc, bsize, 0); |
| 955 | brelse(epos.bh); |
| 956 | |
| 957 | block = udf_get_pblock(sb, block, |
| 958 | iinfo->i_location.partitionReferenceNum, |
| 959 | 0); |
| 960 | epos.bh = udf_tgetblk(sb, block); |
| 961 | lock_buffer(epos.bh); |
| 962 | memset(epos.bh->b_data, 0x00, bsize); |
| 963 | set_buffer_uptodate(epos.bh); |
| 964 | unlock_buffer(epos.bh); |
| 965 | mark_buffer_dirty_inode(epos.bh, inode); |
| 966 | ea = epos.bh->b_data + udf_ext0_offset(inode); |
| 967 | } else |
| 968 | ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr; |
| 969 | |
| 970 | eoffset = sb->s_blocksize - udf_ext0_offset(inode); |
| 971 | pc = (struct pathComponent *)ea; |
| 972 | |
| 973 | if (*symname == '/') { |
| 974 | do { |
| 975 | symname++; |
| 976 | } while (*symname == '/'); |
| 977 | |
| 978 | pc->componentType = 1; |
| 979 | pc->lengthComponentIdent = 0; |
| 980 | pc->componentFileVersionNum = 0; |
| 981 | elen += sizeof(struct pathComponent); |
| 982 | } |
| 983 | |
| 984 | err = -ENAMETOOLONG; |
| 985 | |
| 986 | while (*symname) { |
| 987 | if (elen + sizeof(struct pathComponent) > eoffset) |
| 988 | goto out_no_entry; |
| 989 | |
| 990 | pc = (struct pathComponent *)(ea + elen); |
| 991 | |
| 992 | compstart = symname; |
| 993 | |
| 994 | do { |
| 995 | symname++; |
| 996 | } while (*symname && *symname != '/'); |
| 997 | |
| 998 | pc->componentType = 5; |
| 999 | pc->lengthComponentIdent = 0; |
| 1000 | pc->componentFileVersionNum = 0; |
| 1001 | if (compstart[0] == '.') { |
| 1002 | if ((symname - compstart) == 1) |
| 1003 | pc->componentType = 4; |
| 1004 | else if ((symname - compstart) == 2 && |
| 1005 | compstart[1] == '.') |
| 1006 | pc->componentType = 3; |
| 1007 | } |
| 1008 | |
| 1009 | if (pc->componentType == 5) { |
| 1010 | namelen = udf_put_filename(sb, compstart, |
| 1011 | symname - compstart, |
| 1012 | name, UDF_NAME_LEN_CS0); |
| 1013 | if (!namelen) |
| 1014 | goto out_no_entry; |
| 1015 | |
| 1016 | if (elen + sizeof(struct pathComponent) + namelen > |
| 1017 | eoffset) |
| 1018 | goto out_no_entry; |
| 1019 | else |
| 1020 | pc->lengthComponentIdent = namelen; |
| 1021 | |
| 1022 | memcpy(pc->componentIdent, name, namelen); |
| 1023 | } |
| 1024 | |
| 1025 | elen += sizeof(struct pathComponent) + pc->lengthComponentIdent; |
| 1026 | |
| 1027 | if (*symname) { |
| 1028 | do { |
| 1029 | symname++; |
| 1030 | } while (*symname == '/'); |
| 1031 | } |
| 1032 | } |
| 1033 | |
| 1034 | brelse(epos.bh); |
| 1035 | inode->i_size = elen; |
| 1036 | if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) |
| 1037 | iinfo->i_lenAlloc = inode->i_size; |
| 1038 | else |
| 1039 | udf_truncate_tail_extent(inode); |
| 1040 | mark_inode_dirty(inode); |
| 1041 | up_write(&iinfo->i_data_sem); |
| 1042 | |
| 1043 | err = udf_add_nondir(dentry, inode); |
| 1044 | out: |
| 1045 | kfree(name); |
| 1046 | return err; |
| 1047 | |
| 1048 | out_no_entry: |
| 1049 | up_write(&iinfo->i_data_sem); |
| 1050 | inode_dec_link_count(inode); |
| 1051 | unlock_new_inode(inode); |
| 1052 | iput(inode); |
| 1053 | goto out; |
| 1054 | } |
| 1055 | |
| 1056 | static int udf_link(struct dentry *old_dentry, struct inode *dir, |
| 1057 | struct dentry *dentry) |
| 1058 | { |
| 1059 | struct inode *inode = d_inode(old_dentry); |
| 1060 | struct udf_fileident_bh fibh; |
| 1061 | struct fileIdentDesc cfi, *fi; |
| 1062 | int err; |
| 1063 | |
| 1064 | fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); |
| 1065 | if (!fi) { |
| 1066 | return err; |
| 1067 | } |
| 1068 | cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); |
| 1069 | cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location); |
| 1070 | if (UDF_SB(inode->i_sb)->s_lvid_bh) { |
| 1071 | *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = |
| 1072 | cpu_to_le32(lvid_get_unique_id(inode->i_sb)); |
| 1073 | } |
| 1074 | udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); |
| 1075 | if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) |
| 1076 | mark_inode_dirty(dir); |
| 1077 | |
| 1078 | if (fibh.sbh != fibh.ebh) |
| 1079 | brelse(fibh.ebh); |
| 1080 | brelse(fibh.sbh); |
| 1081 | inc_nlink(inode); |
| 1082 | inode->i_ctime = current_fs_time(inode->i_sb); |
| 1083 | mark_inode_dirty(inode); |
| 1084 | dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb); |
| 1085 | mark_inode_dirty(dir); |
| 1086 | ihold(inode); |
| 1087 | d_instantiate(dentry, inode); |
| 1088 | |
| 1089 | return 0; |
| 1090 | } |
| 1091 | |
| 1092 | /* Anybody can rename anything with this: the permission checks are left to the |
| 1093 | * higher-level routines. |
| 1094 | */ |
| 1095 | static int udf_rename(struct inode *old_dir, struct dentry *old_dentry, |
| 1096 | struct inode *new_dir, struct dentry *new_dentry) |
| 1097 | { |
| 1098 | struct inode *old_inode = d_inode(old_dentry); |
| 1099 | struct inode *new_inode = d_inode(new_dentry); |
| 1100 | struct udf_fileident_bh ofibh, nfibh; |
| 1101 | struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL; |
| 1102 | struct fileIdentDesc ocfi, ncfi; |
| 1103 | struct buffer_head *dir_bh = NULL; |
| 1104 | int retval = -ENOENT; |
| 1105 | struct kernel_lb_addr tloc; |
| 1106 | struct udf_inode_info *old_iinfo = UDF_I(old_inode); |
| 1107 | |
| 1108 | ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi); |
| 1109 | if (IS_ERR(ofi)) { |
| 1110 | retval = PTR_ERR(ofi); |
| 1111 | goto end_rename; |
| 1112 | } |
| 1113 | |
| 1114 | if (ofibh.sbh != ofibh.ebh) |
| 1115 | brelse(ofibh.ebh); |
| 1116 | |
| 1117 | brelse(ofibh.sbh); |
| 1118 | tloc = lelb_to_cpu(ocfi.icb.extLocation); |
| 1119 | if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0) |
| 1120 | != old_inode->i_ino) |
| 1121 | goto end_rename; |
| 1122 | |
| 1123 | nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi); |
| 1124 | if (IS_ERR(nfi)) { |
| 1125 | retval = PTR_ERR(nfi); |
| 1126 | goto end_rename; |
| 1127 | } |
| 1128 | if (nfi && !new_inode) { |
| 1129 | if (nfibh.sbh != nfibh.ebh) |
| 1130 | brelse(nfibh.ebh); |
| 1131 | brelse(nfibh.sbh); |
| 1132 | nfi = NULL; |
| 1133 | } |
| 1134 | if (S_ISDIR(old_inode->i_mode)) { |
| 1135 | int offset = udf_ext0_offset(old_inode); |
| 1136 | |
| 1137 | if (new_inode) { |
| 1138 | retval = -ENOTEMPTY; |
| 1139 | if (!empty_dir(new_inode)) |
| 1140 | goto end_rename; |
| 1141 | } |
| 1142 | retval = -EIO; |
| 1143 | if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { |
| 1144 | dir_fi = udf_get_fileident( |
| 1145 | old_iinfo->i_ext.i_data - |
| 1146 | (old_iinfo->i_efe ? |
| 1147 | sizeof(struct extendedFileEntry) : |
| 1148 | sizeof(struct fileEntry)), |
| 1149 | old_inode->i_sb->s_blocksize, &offset); |
| 1150 | } else { |
| 1151 | dir_bh = udf_bread(old_inode, 0, 0, &retval); |
| 1152 | if (!dir_bh) |
| 1153 | goto end_rename; |
| 1154 | dir_fi = udf_get_fileident(dir_bh->b_data, |
| 1155 | old_inode->i_sb->s_blocksize, &offset); |
| 1156 | } |
| 1157 | if (!dir_fi) |
| 1158 | goto end_rename; |
| 1159 | tloc = lelb_to_cpu(dir_fi->icb.extLocation); |
| 1160 | if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) != |
| 1161 | old_dir->i_ino) |
| 1162 | goto end_rename; |
| 1163 | } |
| 1164 | if (!nfi) { |
| 1165 | nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi, |
| 1166 | &retval); |
| 1167 | if (!nfi) |
| 1168 | goto end_rename; |
| 1169 | } |
| 1170 | |
| 1171 | /* |
| 1172 | * Like most other Unix systems, set the ctime for inodes on a |
| 1173 | * rename. |
| 1174 | */ |
| 1175 | old_inode->i_ctime = current_fs_time(old_inode->i_sb); |
| 1176 | mark_inode_dirty(old_inode); |
| 1177 | |
| 1178 | /* |
| 1179 | * ok, that's it |
| 1180 | */ |
| 1181 | ncfi.fileVersionNum = ocfi.fileVersionNum; |
| 1182 | ncfi.fileCharacteristics = ocfi.fileCharacteristics; |
| 1183 | memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(struct long_ad)); |
| 1184 | udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL); |
| 1185 | |
| 1186 | /* The old fid may have moved - find it again */ |
| 1187 | ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi); |
| 1188 | udf_delete_entry(old_dir, ofi, &ofibh, &ocfi); |
| 1189 | |
| 1190 | if (new_inode) { |
| 1191 | new_inode->i_ctime = current_fs_time(new_inode->i_sb); |
| 1192 | inode_dec_link_count(new_inode); |
| 1193 | } |
| 1194 | old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb); |
| 1195 | new_dir->i_ctime = new_dir->i_mtime = current_fs_time(new_dir->i_sb); |
| 1196 | mark_inode_dirty(old_dir); |
| 1197 | mark_inode_dirty(new_dir); |
| 1198 | |
| 1199 | if (dir_fi) { |
| 1200 | dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location); |
| 1201 | udf_update_tag((char *)dir_fi, |
| 1202 | (sizeof(struct fileIdentDesc) + |
| 1203 | le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3); |
| 1204 | if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) |
| 1205 | mark_inode_dirty(old_inode); |
| 1206 | else |
| 1207 | mark_buffer_dirty_inode(dir_bh, old_inode); |
| 1208 | |
| 1209 | inode_dec_link_count(old_dir); |
| 1210 | if (new_inode) |
| 1211 | inode_dec_link_count(new_inode); |
| 1212 | else { |
| 1213 | inc_nlink(new_dir); |
| 1214 | mark_inode_dirty(new_dir); |
| 1215 | } |
| 1216 | } |
| 1217 | |
| 1218 | if (ofi) { |
| 1219 | if (ofibh.sbh != ofibh.ebh) |
| 1220 | brelse(ofibh.ebh); |
| 1221 | brelse(ofibh.sbh); |
| 1222 | } |
| 1223 | |
| 1224 | retval = 0; |
| 1225 | |
| 1226 | end_rename: |
| 1227 | brelse(dir_bh); |
| 1228 | if (nfi) { |
| 1229 | if (nfibh.sbh != nfibh.ebh) |
| 1230 | brelse(nfibh.ebh); |
| 1231 | brelse(nfibh.sbh); |
| 1232 | } |
| 1233 | |
| 1234 | return retval; |
| 1235 | } |
| 1236 | |
| 1237 | static struct dentry *udf_get_parent(struct dentry *child) |
| 1238 | { |
| 1239 | struct kernel_lb_addr tloc; |
| 1240 | struct inode *inode = NULL; |
| 1241 | struct qstr dotdot = QSTR_INIT("..", 2); |
| 1242 | struct fileIdentDesc cfi; |
| 1243 | struct udf_fileident_bh fibh; |
| 1244 | |
| 1245 | if (!udf_find_entry(d_inode(child), &dotdot, &fibh, &cfi)) |
| 1246 | return ERR_PTR(-EACCES); |
| 1247 | |
| 1248 | if (fibh.sbh != fibh.ebh) |
| 1249 | brelse(fibh.ebh); |
| 1250 | brelse(fibh.sbh); |
| 1251 | |
| 1252 | tloc = lelb_to_cpu(cfi.icb.extLocation); |
| 1253 | inode = udf_iget(d_inode(child)->i_sb, &tloc); |
| 1254 | if (IS_ERR(inode)) |
| 1255 | return ERR_CAST(inode); |
| 1256 | |
| 1257 | return d_obtain_alias(inode); |
| 1258 | } |
| 1259 | |
| 1260 | |
| 1261 | static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block, |
| 1262 | u16 partref, __u32 generation) |
| 1263 | { |
| 1264 | struct inode *inode; |
| 1265 | struct kernel_lb_addr loc; |
| 1266 | |
| 1267 | if (block == 0) |
| 1268 | return ERR_PTR(-ESTALE); |
| 1269 | |
| 1270 | loc.logicalBlockNum = block; |
| 1271 | loc.partitionReferenceNum = partref; |
| 1272 | inode = udf_iget(sb, &loc); |
| 1273 | |
| 1274 | if (IS_ERR(inode)) |
| 1275 | return ERR_CAST(inode); |
| 1276 | |
| 1277 | if (generation && inode->i_generation != generation) { |
| 1278 | iput(inode); |
| 1279 | return ERR_PTR(-ESTALE); |
| 1280 | } |
| 1281 | return d_obtain_alias(inode); |
| 1282 | } |
| 1283 | |
| 1284 | static struct dentry *udf_fh_to_dentry(struct super_block *sb, |
| 1285 | struct fid *fid, int fh_len, int fh_type) |
| 1286 | { |
| 1287 | if (fh_len < 3 || |
| 1288 | (fh_type != FILEID_UDF_WITH_PARENT && |
| 1289 | fh_type != FILEID_UDF_WITHOUT_PARENT)) |
| 1290 | return NULL; |
| 1291 | |
| 1292 | return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref, |
| 1293 | fid->udf.generation); |
| 1294 | } |
| 1295 | |
| 1296 | static struct dentry *udf_fh_to_parent(struct super_block *sb, |
| 1297 | struct fid *fid, int fh_len, int fh_type) |
| 1298 | { |
| 1299 | if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT) |
| 1300 | return NULL; |
| 1301 | |
| 1302 | return udf_nfs_get_inode(sb, fid->udf.parent_block, |
| 1303 | fid->udf.parent_partref, |
| 1304 | fid->udf.parent_generation); |
| 1305 | } |
| 1306 | static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp, |
| 1307 | struct inode *parent) |
| 1308 | { |
| 1309 | int len = *lenp; |
| 1310 | struct kernel_lb_addr location = UDF_I(inode)->i_location; |
| 1311 | struct fid *fid = (struct fid *)fh; |
| 1312 | int type = FILEID_UDF_WITHOUT_PARENT; |
| 1313 | |
| 1314 | if (parent && (len < 5)) { |
| 1315 | *lenp = 5; |
| 1316 | return FILEID_INVALID; |
| 1317 | } else if (len < 3) { |
| 1318 | *lenp = 3; |
| 1319 | return FILEID_INVALID; |
| 1320 | } |
| 1321 | |
| 1322 | *lenp = 3; |
| 1323 | fid->udf.block = location.logicalBlockNum; |
| 1324 | fid->udf.partref = location.partitionReferenceNum; |
| 1325 | fid->udf.parent_partref = 0; |
| 1326 | fid->udf.generation = inode->i_generation; |
| 1327 | |
| 1328 | if (parent) { |
| 1329 | location = UDF_I(parent)->i_location; |
| 1330 | fid->udf.parent_block = location.logicalBlockNum; |
| 1331 | fid->udf.parent_partref = location.partitionReferenceNum; |
| 1332 | fid->udf.parent_generation = inode->i_generation; |
| 1333 | *lenp = 5; |
| 1334 | type = FILEID_UDF_WITH_PARENT; |
| 1335 | } |
| 1336 | |
| 1337 | return type; |
| 1338 | } |
| 1339 | |
| 1340 | const struct export_operations udf_export_ops = { |
| 1341 | .encode_fh = udf_encode_fh, |
| 1342 | .fh_to_dentry = udf_fh_to_dentry, |
| 1343 | .fh_to_parent = udf_fh_to_parent, |
| 1344 | .get_parent = udf_get_parent, |
| 1345 | }; |
| 1346 | |
| 1347 | const struct inode_operations udf_dir_inode_operations = { |
| 1348 | .lookup = udf_lookup, |
| 1349 | .create = udf_create, |
| 1350 | .link = udf_link, |
| 1351 | .unlink = udf_unlink, |
| 1352 | .symlink = udf_symlink, |
| 1353 | .mkdir = udf_mkdir, |
| 1354 | .rmdir = udf_rmdir, |
| 1355 | .mknod = udf_mknod, |
| 1356 | .rename = udf_rename, |
| 1357 | .tmpfile = udf_tmpfile, |
| 1358 | }; |