| 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 | udf_pblk_t block; |
| 168 | int flen; |
| 169 | unsigned char *fname = NULL, *copy_name = NULL; |
| 170 | unsigned char *nameptr; |
| 171 | uint8_t lfi; |
| 172 | uint16_t liu; |
| 173 | loff_t size; |
| 174 | struct kernel_lb_addr eloc; |
| 175 | uint32_t elen; |
| 176 | sector_t offset; |
| 177 | struct extent_position epos = {}; |
| 178 | struct udf_inode_info *dinfo = UDF_I(dir); |
| 179 | int isdotdot = child->len == 2 && |
| 180 | child->name[0] == '.' && child->name[1] == '.'; |
| 181 | struct super_block *sb = dir->i_sb; |
| 182 | |
| 183 | size = udf_ext0_offset(dir) + dir->i_size; |
| 184 | f_pos = udf_ext0_offset(dir); |
| 185 | |
| 186 | fibh->sbh = fibh->ebh = NULL; |
| 187 | fibh->soffset = fibh->eoffset = f_pos & (sb->s_blocksize - 1); |
| 188 | if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { |
| 189 | if (inode_bmap(dir, f_pos >> sb->s_blocksize_bits, &epos, |
| 190 | &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) { |
| 191 | fi = ERR_PTR(-EIO); |
| 192 | goto out_err; |
| 193 | } |
| 194 | |
| 195 | block = udf_get_lb_pblock(sb, &eloc, offset); |
| 196 | if ((++offset << sb->s_blocksize_bits) < elen) { |
| 197 | if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) |
| 198 | epos.offset -= sizeof(struct short_ad); |
| 199 | else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) |
| 200 | epos.offset -= sizeof(struct long_ad); |
| 201 | } else |
| 202 | offset = 0; |
| 203 | |
| 204 | fibh->sbh = fibh->ebh = udf_tread(sb, block); |
| 205 | if (!fibh->sbh) { |
| 206 | fi = ERR_PTR(-EIO); |
| 207 | goto out_err; |
| 208 | } |
| 209 | } |
| 210 | |
| 211 | fname = kmalloc(UDF_NAME_LEN, GFP_NOFS); |
| 212 | if (!fname) { |
| 213 | fi = ERR_PTR(-ENOMEM); |
| 214 | goto out_err; |
| 215 | } |
| 216 | |
| 217 | while (f_pos < size) { |
| 218 | fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc, |
| 219 | &elen, &offset); |
| 220 | if (!fi) { |
| 221 | fi = ERR_PTR(-EIO); |
| 222 | goto out_err; |
| 223 | } |
| 224 | |
| 225 | liu = le16_to_cpu(cfi->lengthOfImpUse); |
| 226 | lfi = cfi->lengthFileIdent; |
| 227 | |
| 228 | if (fibh->sbh == fibh->ebh) { |
| 229 | nameptr = fi->fileIdent + liu; |
| 230 | } else { |
| 231 | int poffset; /* Unpaded ending offset */ |
| 232 | |
| 233 | poffset = fibh->soffset + sizeof(struct fileIdentDesc) + |
| 234 | liu + lfi; |
| 235 | |
| 236 | if (poffset >= lfi) |
| 237 | nameptr = (uint8_t *)(fibh->ebh->b_data + |
| 238 | poffset - lfi); |
| 239 | else { |
| 240 | if (!copy_name) { |
| 241 | copy_name = kmalloc(UDF_NAME_LEN, |
| 242 | GFP_NOFS); |
| 243 | if (!copy_name) { |
| 244 | fi = ERR_PTR(-ENOMEM); |
| 245 | goto out_err; |
| 246 | } |
| 247 | } |
| 248 | nameptr = copy_name; |
| 249 | memcpy(nameptr, fi->fileIdent + liu, |
| 250 | lfi - poffset); |
| 251 | memcpy(nameptr + lfi - poffset, |
| 252 | fibh->ebh->b_data, poffset); |
| 253 | } |
| 254 | } |
| 255 | |
| 256 | if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) { |
| 257 | if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE)) |
| 258 | continue; |
| 259 | } |
| 260 | |
| 261 | if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) { |
| 262 | if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE)) |
| 263 | continue; |
| 264 | } |
| 265 | |
| 266 | if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) && |
| 267 | isdotdot) |
| 268 | goto out_ok; |
| 269 | |
| 270 | if (!lfi) |
| 271 | continue; |
| 272 | |
| 273 | flen = udf_get_filename(sb, nameptr, lfi, fname, UDF_NAME_LEN); |
| 274 | if (flen < 0) { |
| 275 | fi = ERR_PTR(flen); |
| 276 | goto out_err; |
| 277 | } |
| 278 | |
| 279 | if (udf_match(flen, fname, child->len, child->name)) |
| 280 | goto out_ok; |
| 281 | } |
| 282 | |
| 283 | fi = NULL; |
| 284 | out_err: |
| 285 | if (fibh->sbh != fibh->ebh) |
| 286 | brelse(fibh->ebh); |
| 287 | brelse(fibh->sbh); |
| 288 | out_ok: |
| 289 | brelse(epos.bh); |
| 290 | kfree(fname); |
| 291 | kfree(copy_name); |
| 292 | |
| 293 | return fi; |
| 294 | } |
| 295 | |
| 296 | static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry, |
| 297 | unsigned int flags) |
| 298 | { |
| 299 | struct inode *inode = NULL; |
| 300 | struct fileIdentDesc cfi; |
| 301 | struct udf_fileident_bh fibh; |
| 302 | struct fileIdentDesc *fi; |
| 303 | |
| 304 | if (dentry->d_name.len > UDF_NAME_LEN) |
| 305 | return ERR_PTR(-ENAMETOOLONG); |
| 306 | |
| 307 | fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi); |
| 308 | if (IS_ERR(fi)) |
| 309 | return ERR_CAST(fi); |
| 310 | |
| 311 | if (fi) { |
| 312 | struct kernel_lb_addr loc; |
| 313 | |
| 314 | if (fibh.sbh != fibh.ebh) |
| 315 | brelse(fibh.ebh); |
| 316 | brelse(fibh.sbh); |
| 317 | |
| 318 | loc = lelb_to_cpu(cfi.icb.extLocation); |
| 319 | inode = udf_iget(dir->i_sb, &loc); |
| 320 | if (IS_ERR(inode)) |
| 321 | return ERR_CAST(inode); |
| 322 | } |
| 323 | |
| 324 | return d_splice_alias(inode, dentry); |
| 325 | } |
| 326 | |
| 327 | static struct fileIdentDesc *udf_add_entry(struct inode *dir, |
| 328 | struct dentry *dentry, |
| 329 | struct udf_fileident_bh *fibh, |
| 330 | struct fileIdentDesc *cfi, int *err) |
| 331 | { |
| 332 | struct super_block *sb = dir->i_sb; |
| 333 | struct fileIdentDesc *fi = NULL; |
| 334 | unsigned char *name = NULL; |
| 335 | int namelen; |
| 336 | loff_t f_pos; |
| 337 | loff_t size = udf_ext0_offset(dir) + dir->i_size; |
| 338 | int nfidlen; |
| 339 | udf_pblk_t block; |
| 340 | struct kernel_lb_addr eloc; |
| 341 | uint32_t elen = 0; |
| 342 | sector_t offset; |
| 343 | struct extent_position epos = {}; |
| 344 | struct udf_inode_info *dinfo; |
| 345 | |
| 346 | fibh->sbh = fibh->ebh = NULL; |
| 347 | name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS); |
| 348 | if (!name) { |
| 349 | *err = -ENOMEM; |
| 350 | goto out_err; |
| 351 | } |
| 352 | |
| 353 | if (dentry) { |
| 354 | if (!dentry->d_name.len) { |
| 355 | *err = -EINVAL; |
| 356 | goto out_err; |
| 357 | } |
| 358 | namelen = udf_put_filename(sb, dentry->d_name.name, |
| 359 | dentry->d_name.len, |
| 360 | name, UDF_NAME_LEN_CS0); |
| 361 | if (!namelen) { |
| 362 | *err = -ENAMETOOLONG; |
| 363 | goto out_err; |
| 364 | } |
| 365 | } else { |
| 366 | namelen = 0; |
| 367 | } |
| 368 | |
| 369 | nfidlen = ALIGN(sizeof(struct fileIdentDesc) + namelen, UDF_NAME_PAD); |
| 370 | |
| 371 | f_pos = udf_ext0_offset(dir); |
| 372 | |
| 373 | fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1); |
| 374 | dinfo = UDF_I(dir); |
| 375 | if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { |
| 376 | if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos, |
| 377 | &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) { |
| 378 | block = udf_get_lb_pblock(dir->i_sb, |
| 379 | &dinfo->i_location, 0); |
| 380 | fibh->soffset = fibh->eoffset = sb->s_blocksize; |
| 381 | goto add; |
| 382 | } |
| 383 | block = udf_get_lb_pblock(dir->i_sb, &eloc, offset); |
| 384 | if ((++offset << dir->i_sb->s_blocksize_bits) < elen) { |
| 385 | if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) |
| 386 | epos.offset -= sizeof(struct short_ad); |
| 387 | else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) |
| 388 | epos.offset -= sizeof(struct long_ad); |
| 389 | } else |
| 390 | offset = 0; |
| 391 | |
| 392 | fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block); |
| 393 | if (!fibh->sbh) { |
| 394 | *err = -EIO; |
| 395 | goto out_err; |
| 396 | } |
| 397 | |
| 398 | block = dinfo->i_location.logicalBlockNum; |
| 399 | } |
| 400 | |
| 401 | while (f_pos < size) { |
| 402 | fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc, |
| 403 | &elen, &offset); |
| 404 | |
| 405 | if (!fi) { |
| 406 | *err = -EIO; |
| 407 | goto out_err; |
| 408 | } |
| 409 | |
| 410 | if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) { |
| 411 | if (udf_dir_entry_len(cfi) == nfidlen) { |
| 412 | cfi->descTag.tagSerialNum = cpu_to_le16(1); |
| 413 | cfi->fileVersionNum = cpu_to_le16(1); |
| 414 | cfi->fileCharacteristics = 0; |
| 415 | cfi->lengthFileIdent = namelen; |
| 416 | cfi->lengthOfImpUse = cpu_to_le16(0); |
| 417 | if (!udf_write_fi(dir, cfi, fi, fibh, NULL, |
| 418 | name)) |
| 419 | goto out_ok; |
| 420 | else { |
| 421 | *err = -EIO; |
| 422 | goto out_err; |
| 423 | } |
| 424 | } |
| 425 | } |
| 426 | } |
| 427 | |
| 428 | add: |
| 429 | f_pos += nfidlen; |
| 430 | |
| 431 | if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB && |
| 432 | sb->s_blocksize - fibh->eoffset < nfidlen) { |
| 433 | brelse(epos.bh); |
| 434 | epos.bh = NULL; |
| 435 | fibh->soffset -= udf_ext0_offset(dir); |
| 436 | fibh->eoffset -= udf_ext0_offset(dir); |
| 437 | f_pos -= udf_ext0_offset(dir); |
| 438 | if (fibh->sbh != fibh->ebh) |
| 439 | brelse(fibh->ebh); |
| 440 | brelse(fibh->sbh); |
| 441 | fibh->sbh = fibh->ebh = |
| 442 | udf_expand_dir_adinicb(dir, &block, err); |
| 443 | if (!fibh->sbh) |
| 444 | goto out_err; |
| 445 | epos.block = dinfo->i_location; |
| 446 | epos.offset = udf_file_entry_alloc_offset(dir); |
| 447 | /* Load extent udf_expand_dir_adinicb() has created */ |
| 448 | udf_current_aext(dir, &epos, &eloc, &elen, 1); |
| 449 | } |
| 450 | |
| 451 | /* Entry fits into current block? */ |
| 452 | if (sb->s_blocksize - fibh->eoffset >= nfidlen) { |
| 453 | fibh->soffset = fibh->eoffset; |
| 454 | fibh->eoffset += nfidlen; |
| 455 | if (fibh->sbh != fibh->ebh) { |
| 456 | brelse(fibh->sbh); |
| 457 | fibh->sbh = fibh->ebh; |
| 458 | } |
| 459 | |
| 460 | if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { |
| 461 | block = dinfo->i_location.logicalBlockNum; |
| 462 | fi = (struct fileIdentDesc *) |
| 463 | (dinfo->i_ext.i_data + |
| 464 | fibh->soffset - |
| 465 | udf_ext0_offset(dir) + |
| 466 | dinfo->i_lenEAttr); |
| 467 | } else { |
| 468 | block = eloc.logicalBlockNum + |
| 469 | ((elen - 1) >> |
| 470 | dir->i_sb->s_blocksize_bits); |
| 471 | fi = (struct fileIdentDesc *) |
| 472 | (fibh->sbh->b_data + fibh->soffset); |
| 473 | } |
| 474 | } else { |
| 475 | /* Round up last extent in the file */ |
| 476 | elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1); |
| 477 | if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) |
| 478 | epos.offset -= sizeof(struct short_ad); |
| 479 | else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) |
| 480 | epos.offset -= sizeof(struct long_ad); |
| 481 | udf_write_aext(dir, &epos, &eloc, elen, 1); |
| 482 | dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize |
| 483 | - 1) & ~(sb->s_blocksize - 1); |
| 484 | |
| 485 | fibh->soffset = fibh->eoffset - sb->s_blocksize; |
| 486 | fibh->eoffset += nfidlen - sb->s_blocksize; |
| 487 | if (fibh->sbh != fibh->ebh) { |
| 488 | brelse(fibh->sbh); |
| 489 | fibh->sbh = fibh->ebh; |
| 490 | } |
| 491 | |
| 492 | block = eloc.logicalBlockNum + ((elen - 1) >> |
| 493 | dir->i_sb->s_blocksize_bits); |
| 494 | fibh->ebh = udf_bread(dir, |
| 495 | f_pos >> dir->i_sb->s_blocksize_bits, 1, err); |
| 496 | if (!fibh->ebh) |
| 497 | goto out_err; |
| 498 | /* Extents could have been merged, invalidate our position */ |
| 499 | brelse(epos.bh); |
| 500 | epos.bh = NULL; |
| 501 | epos.block = dinfo->i_location; |
| 502 | epos.offset = udf_file_entry_alloc_offset(dir); |
| 503 | |
| 504 | if (!fibh->soffset) { |
| 505 | /* Find the freshly allocated block */ |
| 506 | while (udf_next_aext(dir, &epos, &eloc, &elen, 1) == |
| 507 | (EXT_RECORDED_ALLOCATED >> 30)) |
| 508 | ; |
| 509 | block = eloc.logicalBlockNum + ((elen - 1) >> |
| 510 | dir->i_sb->s_blocksize_bits); |
| 511 | brelse(fibh->sbh); |
| 512 | fibh->sbh = fibh->ebh; |
| 513 | fi = (struct fileIdentDesc *)(fibh->sbh->b_data); |
| 514 | } else { |
| 515 | fi = (struct fileIdentDesc *) |
| 516 | (fibh->sbh->b_data + sb->s_blocksize + |
| 517 | fibh->soffset); |
| 518 | } |
| 519 | } |
| 520 | |
| 521 | memset(cfi, 0, sizeof(struct fileIdentDesc)); |
| 522 | if (UDF_SB(sb)->s_udfrev >= 0x0200) |
| 523 | udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block, |
| 524 | sizeof(struct tag)); |
| 525 | else |
| 526 | udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block, |
| 527 | sizeof(struct tag)); |
| 528 | cfi->fileVersionNum = cpu_to_le16(1); |
| 529 | cfi->lengthFileIdent = namelen; |
| 530 | cfi->lengthOfImpUse = cpu_to_le16(0); |
| 531 | if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) { |
| 532 | dir->i_size += nfidlen; |
| 533 | if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) |
| 534 | dinfo->i_lenAlloc += nfidlen; |
| 535 | else { |
| 536 | /* Find the last extent and truncate it to proper size */ |
| 537 | while (udf_next_aext(dir, &epos, &eloc, &elen, 1) == |
| 538 | (EXT_RECORDED_ALLOCATED >> 30)) |
| 539 | ; |
| 540 | elen -= dinfo->i_lenExtents - dir->i_size; |
| 541 | if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) |
| 542 | epos.offset -= sizeof(struct short_ad); |
| 543 | else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) |
| 544 | epos.offset -= sizeof(struct long_ad); |
| 545 | udf_write_aext(dir, &epos, &eloc, elen, 1); |
| 546 | dinfo->i_lenExtents = dir->i_size; |
| 547 | } |
| 548 | |
| 549 | mark_inode_dirty(dir); |
| 550 | goto out_ok; |
| 551 | } else { |
| 552 | *err = -EIO; |
| 553 | goto out_err; |
| 554 | } |
| 555 | |
| 556 | out_err: |
| 557 | fi = NULL; |
| 558 | if (fibh->sbh != fibh->ebh) |
| 559 | brelse(fibh->ebh); |
| 560 | brelse(fibh->sbh); |
| 561 | out_ok: |
| 562 | brelse(epos.bh); |
| 563 | kfree(name); |
| 564 | return fi; |
| 565 | } |
| 566 | |
| 567 | static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi, |
| 568 | struct udf_fileident_bh *fibh, |
| 569 | struct fileIdentDesc *cfi) |
| 570 | { |
| 571 | cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED; |
| 572 | |
| 573 | if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT)) |
| 574 | memset(&(cfi->icb), 0x00, sizeof(struct long_ad)); |
| 575 | |
| 576 | return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL); |
| 577 | } |
| 578 | |
| 579 | static int udf_add_nondir(struct dentry *dentry, struct inode *inode) |
| 580 | { |
| 581 | struct udf_inode_info *iinfo = UDF_I(inode); |
| 582 | struct inode *dir = d_inode(dentry->d_parent); |
| 583 | struct udf_fileident_bh fibh; |
| 584 | struct fileIdentDesc cfi, *fi; |
| 585 | int err; |
| 586 | |
| 587 | fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); |
| 588 | if (unlikely(!fi)) { |
| 589 | inode_dec_link_count(inode); |
| 590 | discard_new_inode(inode); |
| 591 | return err; |
| 592 | } |
| 593 | cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); |
| 594 | cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location); |
| 595 | *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = |
| 596 | cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); |
| 597 | udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); |
| 598 | dir->i_ctime = dir->i_mtime = current_time(dir); |
| 599 | mark_inode_dirty(dir); |
| 600 | if (fibh.sbh != fibh.ebh) |
| 601 | brelse(fibh.ebh); |
| 602 | brelse(fibh.sbh); |
| 603 | d_instantiate_new(dentry, inode); |
| 604 | |
| 605 | return 0; |
| 606 | } |
| 607 | |
| 608 | static int udf_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
| 609 | bool excl) |
| 610 | { |
| 611 | struct inode *inode = udf_new_inode(dir, mode); |
| 612 | |
| 613 | if (IS_ERR(inode)) |
| 614 | return PTR_ERR(inode); |
| 615 | |
| 616 | if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) |
| 617 | inode->i_data.a_ops = &udf_adinicb_aops; |
| 618 | else |
| 619 | inode->i_data.a_ops = &udf_aops; |
| 620 | inode->i_op = &udf_file_inode_operations; |
| 621 | inode->i_fop = &udf_file_operations; |
| 622 | mark_inode_dirty(inode); |
| 623 | |
| 624 | return udf_add_nondir(dentry, inode); |
| 625 | } |
| 626 | |
| 627 | static int udf_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode) |
| 628 | { |
| 629 | struct inode *inode = udf_new_inode(dir, mode); |
| 630 | |
| 631 | if (IS_ERR(inode)) |
| 632 | return PTR_ERR(inode); |
| 633 | |
| 634 | if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) |
| 635 | inode->i_data.a_ops = &udf_adinicb_aops; |
| 636 | else |
| 637 | inode->i_data.a_ops = &udf_aops; |
| 638 | inode->i_op = &udf_file_inode_operations; |
| 639 | inode->i_fop = &udf_file_operations; |
| 640 | mark_inode_dirty(inode); |
| 641 | d_tmpfile(dentry, inode); |
| 642 | unlock_new_inode(inode); |
| 643 | return 0; |
| 644 | } |
| 645 | |
| 646 | static int udf_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, |
| 647 | dev_t rdev) |
| 648 | { |
| 649 | struct inode *inode; |
| 650 | |
| 651 | if (!old_valid_dev(rdev)) |
| 652 | return -EINVAL; |
| 653 | |
| 654 | inode = udf_new_inode(dir, mode); |
| 655 | if (IS_ERR(inode)) |
| 656 | return PTR_ERR(inode); |
| 657 | |
| 658 | init_special_inode(inode, mode, rdev); |
| 659 | return udf_add_nondir(dentry, inode); |
| 660 | } |
| 661 | |
| 662 | static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
| 663 | { |
| 664 | struct inode *inode; |
| 665 | struct udf_fileident_bh fibh; |
| 666 | struct fileIdentDesc cfi, *fi; |
| 667 | int err; |
| 668 | struct udf_inode_info *dinfo = UDF_I(dir); |
| 669 | struct udf_inode_info *iinfo; |
| 670 | |
| 671 | inode = udf_new_inode(dir, S_IFDIR | mode); |
| 672 | if (IS_ERR(inode)) |
| 673 | return PTR_ERR(inode); |
| 674 | |
| 675 | iinfo = UDF_I(inode); |
| 676 | inode->i_op = &udf_dir_inode_operations; |
| 677 | inode->i_fop = &udf_dir_operations; |
| 678 | fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err); |
| 679 | if (!fi) { |
| 680 | inode_dec_link_count(inode); |
| 681 | discard_new_inode(inode); |
| 682 | goto out; |
| 683 | } |
| 684 | set_nlink(inode, 2); |
| 685 | cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); |
| 686 | cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location); |
| 687 | *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = |
| 688 | cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL); |
| 689 | cfi.fileCharacteristics = |
| 690 | FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT; |
| 691 | udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL); |
| 692 | brelse(fibh.sbh); |
| 693 | mark_inode_dirty(inode); |
| 694 | |
| 695 | fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); |
| 696 | if (!fi) { |
| 697 | clear_nlink(inode); |
| 698 | mark_inode_dirty(inode); |
| 699 | discard_new_inode(inode); |
| 700 | goto out; |
| 701 | } |
| 702 | cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); |
| 703 | cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location); |
| 704 | *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = |
| 705 | cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); |
| 706 | cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY; |
| 707 | udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); |
| 708 | inc_nlink(dir); |
| 709 | dir->i_ctime = dir->i_mtime = current_time(dir); |
| 710 | mark_inode_dirty(dir); |
| 711 | d_instantiate_new(dentry, inode); |
| 712 | if (fibh.sbh != fibh.ebh) |
| 713 | brelse(fibh.ebh); |
| 714 | brelse(fibh.sbh); |
| 715 | err = 0; |
| 716 | |
| 717 | out: |
| 718 | return err; |
| 719 | } |
| 720 | |
| 721 | static int empty_dir(struct inode *dir) |
| 722 | { |
| 723 | struct fileIdentDesc *fi, cfi; |
| 724 | struct udf_fileident_bh fibh; |
| 725 | loff_t f_pos; |
| 726 | loff_t size = udf_ext0_offset(dir) + dir->i_size; |
| 727 | udf_pblk_t block; |
| 728 | struct kernel_lb_addr eloc; |
| 729 | uint32_t elen; |
| 730 | sector_t offset; |
| 731 | struct extent_position epos = {}; |
| 732 | struct udf_inode_info *dinfo = UDF_I(dir); |
| 733 | |
| 734 | f_pos = udf_ext0_offset(dir); |
| 735 | fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1); |
| 736 | |
| 737 | if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) |
| 738 | fibh.sbh = fibh.ebh = NULL; |
| 739 | else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, |
| 740 | &epos, &eloc, &elen, &offset) == |
| 741 | (EXT_RECORDED_ALLOCATED >> 30)) { |
| 742 | block = udf_get_lb_pblock(dir->i_sb, &eloc, offset); |
| 743 | if ((++offset << dir->i_sb->s_blocksize_bits) < elen) { |
| 744 | if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) |
| 745 | epos.offset -= sizeof(struct short_ad); |
| 746 | else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) |
| 747 | epos.offset -= sizeof(struct long_ad); |
| 748 | } else |
| 749 | offset = 0; |
| 750 | |
| 751 | fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block); |
| 752 | if (!fibh.sbh) { |
| 753 | brelse(epos.bh); |
| 754 | return 0; |
| 755 | } |
| 756 | } else { |
| 757 | brelse(epos.bh); |
| 758 | return 0; |
| 759 | } |
| 760 | |
| 761 | while (f_pos < size) { |
| 762 | fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc, |
| 763 | &elen, &offset); |
| 764 | if (!fi) { |
| 765 | if (fibh.sbh != fibh.ebh) |
| 766 | brelse(fibh.ebh); |
| 767 | brelse(fibh.sbh); |
| 768 | brelse(epos.bh); |
| 769 | return 0; |
| 770 | } |
| 771 | |
| 772 | if (cfi.lengthFileIdent && |
| 773 | (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) { |
| 774 | if (fibh.sbh != fibh.ebh) |
| 775 | brelse(fibh.ebh); |
| 776 | brelse(fibh.sbh); |
| 777 | brelse(epos.bh); |
| 778 | return 0; |
| 779 | } |
| 780 | } |
| 781 | |
| 782 | if (fibh.sbh != fibh.ebh) |
| 783 | brelse(fibh.ebh); |
| 784 | brelse(fibh.sbh); |
| 785 | brelse(epos.bh); |
| 786 | |
| 787 | return 1; |
| 788 | } |
| 789 | |
| 790 | static int udf_rmdir(struct inode *dir, struct dentry *dentry) |
| 791 | { |
| 792 | int retval; |
| 793 | struct inode *inode = d_inode(dentry); |
| 794 | struct udf_fileident_bh fibh; |
| 795 | struct fileIdentDesc *fi, cfi; |
| 796 | struct kernel_lb_addr tloc; |
| 797 | |
| 798 | retval = -ENOENT; |
| 799 | fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi); |
| 800 | if (IS_ERR_OR_NULL(fi)) { |
| 801 | if (fi) |
| 802 | retval = PTR_ERR(fi); |
| 803 | goto out; |
| 804 | } |
| 805 | |
| 806 | retval = -EIO; |
| 807 | tloc = lelb_to_cpu(cfi.icb.extLocation); |
| 808 | if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) |
| 809 | goto end_rmdir; |
| 810 | retval = -ENOTEMPTY; |
| 811 | if (!empty_dir(inode)) |
| 812 | goto end_rmdir; |
| 813 | retval = udf_delete_entry(dir, fi, &fibh, &cfi); |
| 814 | if (retval) |
| 815 | goto end_rmdir; |
| 816 | if (inode->i_nlink != 2) |
| 817 | udf_warn(inode->i_sb, "empty directory has nlink != 2 (%u)\n", |
| 818 | inode->i_nlink); |
| 819 | clear_nlink(inode); |
| 820 | inode->i_size = 0; |
| 821 | inode_dec_link_count(dir); |
| 822 | inode->i_ctime = dir->i_ctime = dir->i_mtime = |
| 823 | current_time(inode); |
| 824 | mark_inode_dirty(dir); |
| 825 | |
| 826 | end_rmdir: |
| 827 | if (fibh.sbh != fibh.ebh) |
| 828 | brelse(fibh.ebh); |
| 829 | brelse(fibh.sbh); |
| 830 | |
| 831 | out: |
| 832 | return retval; |
| 833 | } |
| 834 | |
| 835 | static int udf_unlink(struct inode *dir, struct dentry *dentry) |
| 836 | { |
| 837 | int retval; |
| 838 | struct inode *inode = d_inode(dentry); |
| 839 | struct udf_fileident_bh fibh; |
| 840 | struct fileIdentDesc *fi; |
| 841 | struct fileIdentDesc cfi; |
| 842 | struct kernel_lb_addr tloc; |
| 843 | |
| 844 | retval = -ENOENT; |
| 845 | fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi); |
| 846 | |
| 847 | if (IS_ERR_OR_NULL(fi)) { |
| 848 | if (fi) |
| 849 | retval = PTR_ERR(fi); |
| 850 | goto out; |
| 851 | } |
| 852 | |
| 853 | retval = -EIO; |
| 854 | tloc = lelb_to_cpu(cfi.icb.extLocation); |
| 855 | if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) |
| 856 | goto end_unlink; |
| 857 | |
| 858 | if (!inode->i_nlink) { |
| 859 | udf_debug("Deleting nonexistent file (%lu), %u\n", |
| 860 | inode->i_ino, inode->i_nlink); |
| 861 | set_nlink(inode, 1); |
| 862 | } |
| 863 | retval = udf_delete_entry(dir, fi, &fibh, &cfi); |
| 864 | if (retval) |
| 865 | goto end_unlink; |
| 866 | dir->i_ctime = dir->i_mtime = current_time(dir); |
| 867 | mark_inode_dirty(dir); |
| 868 | inode_dec_link_count(inode); |
| 869 | inode->i_ctime = dir->i_ctime; |
| 870 | retval = 0; |
| 871 | |
| 872 | end_unlink: |
| 873 | if (fibh.sbh != fibh.ebh) |
| 874 | brelse(fibh.ebh); |
| 875 | brelse(fibh.sbh); |
| 876 | |
| 877 | out: |
| 878 | return retval; |
| 879 | } |
| 880 | |
| 881 | static int udf_symlink(struct inode *dir, struct dentry *dentry, |
| 882 | const char *symname) |
| 883 | { |
| 884 | struct inode *inode = udf_new_inode(dir, S_IFLNK | 0777); |
| 885 | struct pathComponent *pc; |
| 886 | const char *compstart; |
| 887 | struct extent_position epos = {}; |
| 888 | int eoffset, elen = 0; |
| 889 | uint8_t *ea; |
| 890 | int err; |
| 891 | udf_pblk_t block; |
| 892 | unsigned char *name = NULL; |
| 893 | int namelen; |
| 894 | struct udf_inode_info *iinfo; |
| 895 | struct super_block *sb = dir->i_sb; |
| 896 | |
| 897 | if (IS_ERR(inode)) |
| 898 | return PTR_ERR(inode); |
| 899 | |
| 900 | iinfo = UDF_I(inode); |
| 901 | down_write(&iinfo->i_data_sem); |
| 902 | name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS); |
| 903 | if (!name) { |
| 904 | err = -ENOMEM; |
| 905 | goto out_no_entry; |
| 906 | } |
| 907 | |
| 908 | inode->i_data.a_ops = &udf_symlink_aops; |
| 909 | inode->i_op = &udf_symlink_inode_operations; |
| 910 | inode_nohighmem(inode); |
| 911 | |
| 912 | if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { |
| 913 | struct kernel_lb_addr eloc; |
| 914 | uint32_t bsize; |
| 915 | |
| 916 | block = udf_new_block(sb, inode, |
| 917 | iinfo->i_location.partitionReferenceNum, |
| 918 | iinfo->i_location.logicalBlockNum, &err); |
| 919 | if (!block) |
| 920 | goto out_no_entry; |
| 921 | epos.block = iinfo->i_location; |
| 922 | epos.offset = udf_file_entry_alloc_offset(inode); |
| 923 | epos.bh = NULL; |
| 924 | eloc.logicalBlockNum = block; |
| 925 | eloc.partitionReferenceNum = |
| 926 | iinfo->i_location.partitionReferenceNum; |
| 927 | bsize = sb->s_blocksize; |
| 928 | iinfo->i_lenExtents = bsize; |
| 929 | udf_add_aext(inode, &epos, &eloc, bsize, 0); |
| 930 | brelse(epos.bh); |
| 931 | |
| 932 | block = udf_get_pblock(sb, block, |
| 933 | iinfo->i_location.partitionReferenceNum, |
| 934 | 0); |
| 935 | epos.bh = udf_tgetblk(sb, block); |
| 936 | lock_buffer(epos.bh); |
| 937 | memset(epos.bh->b_data, 0x00, bsize); |
| 938 | set_buffer_uptodate(epos.bh); |
| 939 | unlock_buffer(epos.bh); |
| 940 | mark_buffer_dirty_inode(epos.bh, inode); |
| 941 | ea = epos.bh->b_data + udf_ext0_offset(inode); |
| 942 | } else |
| 943 | ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr; |
| 944 | |
| 945 | eoffset = sb->s_blocksize - udf_ext0_offset(inode); |
| 946 | pc = (struct pathComponent *)ea; |
| 947 | |
| 948 | if (*symname == '/') { |
| 949 | do { |
| 950 | symname++; |
| 951 | } while (*symname == '/'); |
| 952 | |
| 953 | pc->componentType = 1; |
| 954 | pc->lengthComponentIdent = 0; |
| 955 | pc->componentFileVersionNum = 0; |
| 956 | elen += sizeof(struct pathComponent); |
| 957 | } |
| 958 | |
| 959 | err = -ENAMETOOLONG; |
| 960 | |
| 961 | while (*symname) { |
| 962 | if (elen + sizeof(struct pathComponent) > eoffset) |
| 963 | goto out_no_entry; |
| 964 | |
| 965 | pc = (struct pathComponent *)(ea + elen); |
| 966 | |
| 967 | compstart = symname; |
| 968 | |
| 969 | do { |
| 970 | symname++; |
| 971 | } while (*symname && *symname != '/'); |
| 972 | |
| 973 | pc->componentType = 5; |
| 974 | pc->lengthComponentIdent = 0; |
| 975 | pc->componentFileVersionNum = 0; |
| 976 | if (compstart[0] == '.') { |
| 977 | if ((symname - compstart) == 1) |
| 978 | pc->componentType = 4; |
| 979 | else if ((symname - compstart) == 2 && |
| 980 | compstart[1] == '.') |
| 981 | pc->componentType = 3; |
| 982 | } |
| 983 | |
| 984 | if (pc->componentType == 5) { |
| 985 | namelen = udf_put_filename(sb, compstart, |
| 986 | symname - compstart, |
| 987 | name, UDF_NAME_LEN_CS0); |
| 988 | if (!namelen) |
| 989 | goto out_no_entry; |
| 990 | |
| 991 | if (elen + sizeof(struct pathComponent) + namelen > |
| 992 | eoffset) |
| 993 | goto out_no_entry; |
| 994 | else |
| 995 | pc->lengthComponentIdent = namelen; |
| 996 | |
| 997 | memcpy(pc->componentIdent, name, namelen); |
| 998 | } |
| 999 | |
| 1000 | elen += sizeof(struct pathComponent) + pc->lengthComponentIdent; |
| 1001 | |
| 1002 | if (*symname) { |
| 1003 | do { |
| 1004 | symname++; |
| 1005 | } while (*symname == '/'); |
| 1006 | } |
| 1007 | } |
| 1008 | |
| 1009 | brelse(epos.bh); |
| 1010 | inode->i_size = elen; |
| 1011 | if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) |
| 1012 | iinfo->i_lenAlloc = inode->i_size; |
| 1013 | else |
| 1014 | udf_truncate_tail_extent(inode); |
| 1015 | mark_inode_dirty(inode); |
| 1016 | up_write(&iinfo->i_data_sem); |
| 1017 | |
| 1018 | err = udf_add_nondir(dentry, inode); |
| 1019 | out: |
| 1020 | kfree(name); |
| 1021 | return err; |
| 1022 | |
| 1023 | out_no_entry: |
| 1024 | up_write(&iinfo->i_data_sem); |
| 1025 | inode_dec_link_count(inode); |
| 1026 | discard_new_inode(inode); |
| 1027 | goto out; |
| 1028 | } |
| 1029 | |
| 1030 | static int udf_link(struct dentry *old_dentry, struct inode *dir, |
| 1031 | struct dentry *dentry) |
| 1032 | { |
| 1033 | struct inode *inode = d_inode(old_dentry); |
| 1034 | struct udf_fileident_bh fibh; |
| 1035 | struct fileIdentDesc cfi, *fi; |
| 1036 | int err; |
| 1037 | |
| 1038 | fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); |
| 1039 | if (!fi) { |
| 1040 | return err; |
| 1041 | } |
| 1042 | cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); |
| 1043 | cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location); |
| 1044 | if (UDF_SB(inode->i_sb)->s_lvid_bh) { |
| 1045 | *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = |
| 1046 | cpu_to_le32(lvid_get_unique_id(inode->i_sb)); |
| 1047 | } |
| 1048 | udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); |
| 1049 | if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) |
| 1050 | mark_inode_dirty(dir); |
| 1051 | |
| 1052 | if (fibh.sbh != fibh.ebh) |
| 1053 | brelse(fibh.ebh); |
| 1054 | brelse(fibh.sbh); |
| 1055 | inc_nlink(inode); |
| 1056 | inode->i_ctime = current_time(inode); |
| 1057 | mark_inode_dirty(inode); |
| 1058 | dir->i_ctime = dir->i_mtime = current_time(dir); |
| 1059 | mark_inode_dirty(dir); |
| 1060 | ihold(inode); |
| 1061 | d_instantiate(dentry, inode); |
| 1062 | |
| 1063 | return 0; |
| 1064 | } |
| 1065 | |
| 1066 | /* Anybody can rename anything with this: the permission checks are left to the |
| 1067 | * higher-level routines. |
| 1068 | */ |
| 1069 | static int udf_rename(struct inode *old_dir, struct dentry *old_dentry, |
| 1070 | struct inode *new_dir, struct dentry *new_dentry, |
| 1071 | unsigned int flags) |
| 1072 | { |
| 1073 | struct inode *old_inode = d_inode(old_dentry); |
| 1074 | struct inode *new_inode = d_inode(new_dentry); |
| 1075 | struct udf_fileident_bh ofibh, nfibh; |
| 1076 | struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL; |
| 1077 | struct fileIdentDesc ocfi, ncfi; |
| 1078 | struct buffer_head *dir_bh = NULL; |
| 1079 | int retval = -ENOENT; |
| 1080 | struct kernel_lb_addr tloc; |
| 1081 | struct udf_inode_info *old_iinfo = UDF_I(old_inode); |
| 1082 | |
| 1083 | if (flags & ~RENAME_NOREPLACE) |
| 1084 | return -EINVAL; |
| 1085 | |
| 1086 | ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi); |
| 1087 | if (IS_ERR(ofi)) { |
| 1088 | retval = PTR_ERR(ofi); |
| 1089 | goto end_rename; |
| 1090 | } |
| 1091 | |
| 1092 | if (ofibh.sbh != ofibh.ebh) |
| 1093 | brelse(ofibh.ebh); |
| 1094 | |
| 1095 | brelse(ofibh.sbh); |
| 1096 | tloc = lelb_to_cpu(ocfi.icb.extLocation); |
| 1097 | if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0) |
| 1098 | != old_inode->i_ino) |
| 1099 | goto end_rename; |
| 1100 | |
| 1101 | nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi); |
| 1102 | if (IS_ERR(nfi)) { |
| 1103 | retval = PTR_ERR(nfi); |
| 1104 | goto end_rename; |
| 1105 | } |
| 1106 | if (nfi && !new_inode) { |
| 1107 | if (nfibh.sbh != nfibh.ebh) |
| 1108 | brelse(nfibh.ebh); |
| 1109 | brelse(nfibh.sbh); |
| 1110 | nfi = NULL; |
| 1111 | } |
| 1112 | if (S_ISDIR(old_inode->i_mode)) { |
| 1113 | int offset = udf_ext0_offset(old_inode); |
| 1114 | |
| 1115 | if (new_inode) { |
| 1116 | retval = -ENOTEMPTY; |
| 1117 | if (!empty_dir(new_inode)) |
| 1118 | goto end_rename; |
| 1119 | } |
| 1120 | retval = -EIO; |
| 1121 | if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { |
| 1122 | dir_fi = udf_get_fileident( |
| 1123 | old_iinfo->i_ext.i_data - |
| 1124 | (old_iinfo->i_efe ? |
| 1125 | sizeof(struct extendedFileEntry) : |
| 1126 | sizeof(struct fileEntry)), |
| 1127 | old_inode->i_sb->s_blocksize, &offset); |
| 1128 | } else { |
| 1129 | dir_bh = udf_bread(old_inode, 0, 0, &retval); |
| 1130 | if (!dir_bh) |
| 1131 | goto end_rename; |
| 1132 | dir_fi = udf_get_fileident(dir_bh->b_data, |
| 1133 | old_inode->i_sb->s_blocksize, &offset); |
| 1134 | } |
| 1135 | if (!dir_fi) |
| 1136 | goto end_rename; |
| 1137 | tloc = lelb_to_cpu(dir_fi->icb.extLocation); |
| 1138 | if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) != |
| 1139 | old_dir->i_ino) |
| 1140 | goto end_rename; |
| 1141 | } |
| 1142 | if (!nfi) { |
| 1143 | nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi, |
| 1144 | &retval); |
| 1145 | if (!nfi) |
| 1146 | goto end_rename; |
| 1147 | } |
| 1148 | |
| 1149 | /* |
| 1150 | * Like most other Unix systems, set the ctime for inodes on a |
| 1151 | * rename. |
| 1152 | */ |
| 1153 | old_inode->i_ctime = current_time(old_inode); |
| 1154 | mark_inode_dirty(old_inode); |
| 1155 | |
| 1156 | /* |
| 1157 | * ok, that's it |
| 1158 | */ |
| 1159 | ncfi.fileVersionNum = ocfi.fileVersionNum; |
| 1160 | ncfi.fileCharacteristics = ocfi.fileCharacteristics; |
| 1161 | memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(ocfi.icb)); |
| 1162 | udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL); |
| 1163 | |
| 1164 | /* The old fid may have moved - find it again */ |
| 1165 | ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi); |
| 1166 | udf_delete_entry(old_dir, ofi, &ofibh, &ocfi); |
| 1167 | |
| 1168 | if (new_inode) { |
| 1169 | new_inode->i_ctime = current_time(new_inode); |
| 1170 | inode_dec_link_count(new_inode); |
| 1171 | } |
| 1172 | old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir); |
| 1173 | new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir); |
| 1174 | mark_inode_dirty(old_dir); |
| 1175 | mark_inode_dirty(new_dir); |
| 1176 | |
| 1177 | if (dir_fi) { |
| 1178 | dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location); |
| 1179 | udf_update_tag((char *)dir_fi, udf_dir_entry_len(dir_fi)); |
| 1180 | if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) |
| 1181 | mark_inode_dirty(old_inode); |
| 1182 | else |
| 1183 | mark_buffer_dirty_inode(dir_bh, old_inode); |
| 1184 | |
| 1185 | inode_dec_link_count(old_dir); |
| 1186 | if (new_inode) |
| 1187 | inode_dec_link_count(new_inode); |
| 1188 | else { |
| 1189 | inc_nlink(new_dir); |
| 1190 | mark_inode_dirty(new_dir); |
| 1191 | } |
| 1192 | } |
| 1193 | |
| 1194 | if (ofi) { |
| 1195 | if (ofibh.sbh != ofibh.ebh) |
| 1196 | brelse(ofibh.ebh); |
| 1197 | brelse(ofibh.sbh); |
| 1198 | } |
| 1199 | |
| 1200 | retval = 0; |
| 1201 | |
| 1202 | end_rename: |
| 1203 | brelse(dir_bh); |
| 1204 | if (nfi) { |
| 1205 | if (nfibh.sbh != nfibh.ebh) |
| 1206 | brelse(nfibh.ebh); |
| 1207 | brelse(nfibh.sbh); |
| 1208 | } |
| 1209 | |
| 1210 | return retval; |
| 1211 | } |
| 1212 | |
| 1213 | static struct dentry *udf_get_parent(struct dentry *child) |
| 1214 | { |
| 1215 | struct kernel_lb_addr tloc; |
| 1216 | struct inode *inode = NULL; |
| 1217 | struct qstr dotdot = QSTR_INIT("..", 2); |
| 1218 | struct fileIdentDesc cfi; |
| 1219 | struct udf_fileident_bh fibh; |
| 1220 | |
| 1221 | if (!udf_find_entry(d_inode(child), &dotdot, &fibh, &cfi)) |
| 1222 | return ERR_PTR(-EACCES); |
| 1223 | |
| 1224 | if (fibh.sbh != fibh.ebh) |
| 1225 | brelse(fibh.ebh); |
| 1226 | brelse(fibh.sbh); |
| 1227 | |
| 1228 | tloc = lelb_to_cpu(cfi.icb.extLocation); |
| 1229 | inode = udf_iget(child->d_sb, &tloc); |
| 1230 | if (IS_ERR(inode)) |
| 1231 | return ERR_CAST(inode); |
| 1232 | |
| 1233 | return d_obtain_alias(inode); |
| 1234 | } |
| 1235 | |
| 1236 | |
| 1237 | static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block, |
| 1238 | u16 partref, __u32 generation) |
| 1239 | { |
| 1240 | struct inode *inode; |
| 1241 | struct kernel_lb_addr loc; |
| 1242 | |
| 1243 | if (block == 0) |
| 1244 | return ERR_PTR(-ESTALE); |
| 1245 | |
| 1246 | loc.logicalBlockNum = block; |
| 1247 | loc.partitionReferenceNum = partref; |
| 1248 | inode = udf_iget(sb, &loc); |
| 1249 | |
| 1250 | if (IS_ERR(inode)) |
| 1251 | return ERR_CAST(inode); |
| 1252 | |
| 1253 | if (generation && inode->i_generation != generation) { |
| 1254 | iput(inode); |
| 1255 | return ERR_PTR(-ESTALE); |
| 1256 | } |
| 1257 | return d_obtain_alias(inode); |
| 1258 | } |
| 1259 | |
| 1260 | static struct dentry *udf_fh_to_dentry(struct super_block *sb, |
| 1261 | struct fid *fid, int fh_len, int fh_type) |
| 1262 | { |
| 1263 | if (fh_len < 3 || |
| 1264 | (fh_type != FILEID_UDF_WITH_PARENT && |
| 1265 | fh_type != FILEID_UDF_WITHOUT_PARENT)) |
| 1266 | return NULL; |
| 1267 | |
| 1268 | return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref, |
| 1269 | fid->udf.generation); |
| 1270 | } |
| 1271 | |
| 1272 | static struct dentry *udf_fh_to_parent(struct super_block *sb, |
| 1273 | struct fid *fid, int fh_len, int fh_type) |
| 1274 | { |
| 1275 | if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT) |
| 1276 | return NULL; |
| 1277 | |
| 1278 | return udf_nfs_get_inode(sb, fid->udf.parent_block, |
| 1279 | fid->udf.parent_partref, |
| 1280 | fid->udf.parent_generation); |
| 1281 | } |
| 1282 | static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp, |
| 1283 | struct inode *parent) |
| 1284 | { |
| 1285 | int len = *lenp; |
| 1286 | struct kernel_lb_addr location = UDF_I(inode)->i_location; |
| 1287 | struct fid *fid = (struct fid *)fh; |
| 1288 | int type = FILEID_UDF_WITHOUT_PARENT; |
| 1289 | |
| 1290 | if (parent && (len < 5)) { |
| 1291 | *lenp = 5; |
| 1292 | return FILEID_INVALID; |
| 1293 | } else if (len < 3) { |
| 1294 | *lenp = 3; |
| 1295 | return FILEID_INVALID; |
| 1296 | } |
| 1297 | |
| 1298 | *lenp = 3; |
| 1299 | fid->udf.block = location.logicalBlockNum; |
| 1300 | fid->udf.partref = location.partitionReferenceNum; |
| 1301 | fid->udf.parent_partref = 0; |
| 1302 | fid->udf.generation = inode->i_generation; |
| 1303 | |
| 1304 | if (parent) { |
| 1305 | location = UDF_I(parent)->i_location; |
| 1306 | fid->udf.parent_block = location.logicalBlockNum; |
| 1307 | fid->udf.parent_partref = location.partitionReferenceNum; |
| 1308 | fid->udf.parent_generation = inode->i_generation; |
| 1309 | *lenp = 5; |
| 1310 | type = FILEID_UDF_WITH_PARENT; |
| 1311 | } |
| 1312 | |
| 1313 | return type; |
| 1314 | } |
| 1315 | |
| 1316 | const struct export_operations udf_export_ops = { |
| 1317 | .encode_fh = udf_encode_fh, |
| 1318 | .fh_to_dentry = udf_fh_to_dentry, |
| 1319 | .fh_to_parent = udf_fh_to_parent, |
| 1320 | .get_parent = udf_get_parent, |
| 1321 | }; |
| 1322 | |
| 1323 | const struct inode_operations udf_dir_inode_operations = { |
| 1324 | .lookup = udf_lookup, |
| 1325 | .create = udf_create, |
| 1326 | .link = udf_link, |
| 1327 | .unlink = udf_unlink, |
| 1328 | .symlink = udf_symlink, |
| 1329 | .mkdir = udf_mkdir, |
| 1330 | .rmdir = udf_rmdir, |
| 1331 | .mknod = udf_mknod, |
| 1332 | .rename = udf_rename, |
| 1333 | .tmpfile = udf_tmpfile, |
| 1334 | }; |