| 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/quotaops.h> |
| 31 | #include <linux/smp_lock.h> |
| 32 | #include <linux/buffer_head.h> |
| 33 | #include <linux/sched.h> |
| 34 | #include <linux/crc-itu-t.h> |
| 35 | #include <linux/exportfs.h> |
| 36 | |
| 37 | static inline int udf_match(int len1, const char *name1, int len2, |
| 38 | const char *name2) |
| 39 | { |
| 40 | if (len1 != len2) |
| 41 | return 0; |
| 42 | |
| 43 | return !memcmp(name1, name2, len1); |
| 44 | } |
| 45 | |
| 46 | int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi, |
| 47 | struct fileIdentDesc *sfi, struct udf_fileident_bh *fibh, |
| 48 | uint8_t *impuse, uint8_t *fileident) |
| 49 | { |
| 50 | uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(struct tag); |
| 51 | uint16_t crc; |
| 52 | int offset; |
| 53 | uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse); |
| 54 | uint8_t lfi = cfi->lengthFileIdent; |
| 55 | int padlen = fibh->eoffset - fibh->soffset - liu - lfi - |
| 56 | sizeof(struct fileIdentDesc); |
| 57 | int adinicb = 0; |
| 58 | |
| 59 | if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) |
| 60 | adinicb = 1; |
| 61 | |
| 62 | offset = fibh->soffset + sizeof(struct fileIdentDesc); |
| 63 | |
| 64 | if (impuse) { |
| 65 | if (adinicb || (offset + liu < 0)) { |
| 66 | memcpy((uint8_t *)sfi->impUse, impuse, liu); |
| 67 | } else if (offset >= 0) { |
| 68 | memcpy(fibh->ebh->b_data + offset, impuse, liu); |
| 69 | } else { |
| 70 | memcpy((uint8_t *)sfi->impUse, impuse, -offset); |
| 71 | memcpy(fibh->ebh->b_data, impuse - offset, |
| 72 | liu + offset); |
| 73 | } |
| 74 | } |
| 75 | |
| 76 | offset += liu; |
| 77 | |
| 78 | if (fileident) { |
| 79 | if (adinicb || (offset + lfi < 0)) { |
| 80 | memcpy((uint8_t *)sfi->fileIdent + liu, fileident, lfi); |
| 81 | } else if (offset >= 0) { |
| 82 | memcpy(fibh->ebh->b_data + offset, fileident, lfi); |
| 83 | } else { |
| 84 | memcpy((uint8_t *)sfi->fileIdent + liu, fileident, |
| 85 | -offset); |
| 86 | memcpy(fibh->ebh->b_data, fileident - offset, |
| 87 | lfi + offset); |
| 88 | } |
| 89 | } |
| 90 | |
| 91 | offset += lfi; |
| 92 | |
| 93 | if (adinicb || (offset + padlen < 0)) { |
| 94 | memset((uint8_t *)sfi->padding + liu + lfi, 0x00, padlen); |
| 95 | } else if (offset >= 0) { |
| 96 | memset(fibh->ebh->b_data + offset, 0x00, padlen); |
| 97 | } else { |
| 98 | memset((uint8_t *)sfi->padding + liu + lfi, 0x00, -offset); |
| 99 | memset(fibh->ebh->b_data, 0x00, padlen + offset); |
| 100 | } |
| 101 | |
| 102 | crc = crc_itu_t(0, (uint8_t *)cfi + sizeof(struct tag), |
| 103 | sizeof(struct fileIdentDesc) - sizeof(struct tag)); |
| 104 | |
| 105 | if (fibh->sbh == fibh->ebh) { |
| 106 | crc = crc_itu_t(crc, (uint8_t *)sfi->impUse, |
| 107 | crclen + sizeof(struct tag) - |
| 108 | sizeof(struct fileIdentDesc)); |
| 109 | } else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) { |
| 110 | crc = crc_itu_t(crc, fibh->ebh->b_data + |
| 111 | sizeof(struct fileIdentDesc) + |
| 112 | fibh->soffset, |
| 113 | crclen + sizeof(struct tag) - |
| 114 | sizeof(struct fileIdentDesc)); |
| 115 | } else { |
| 116 | crc = crc_itu_t(crc, (uint8_t *)sfi->impUse, |
| 117 | -fibh->soffset - sizeof(struct fileIdentDesc)); |
| 118 | crc = crc_itu_t(crc, fibh->ebh->b_data, fibh->eoffset); |
| 119 | } |
| 120 | |
| 121 | cfi->descTag.descCRC = cpu_to_le16(crc); |
| 122 | cfi->descTag.descCRCLength = cpu_to_le16(crclen); |
| 123 | cfi->descTag.tagChecksum = udf_tag_checksum(&cfi->descTag); |
| 124 | |
| 125 | if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset)) { |
| 126 | memcpy((uint8_t *)sfi, (uint8_t *)cfi, |
| 127 | sizeof(struct fileIdentDesc)); |
| 128 | } else { |
| 129 | memcpy((uint8_t *)sfi, (uint8_t *)cfi, -fibh->soffset); |
| 130 | memcpy(fibh->ebh->b_data, (uint8_t *)cfi - fibh->soffset, |
| 131 | sizeof(struct fileIdentDesc) + fibh->soffset); |
| 132 | } |
| 133 | |
| 134 | if (adinicb) { |
| 135 | mark_inode_dirty(inode); |
| 136 | } else { |
| 137 | if (fibh->sbh != fibh->ebh) |
| 138 | mark_buffer_dirty_inode(fibh->ebh, inode); |
| 139 | mark_buffer_dirty_inode(fibh->sbh, inode); |
| 140 | } |
| 141 | return 0; |
| 142 | } |
| 143 | |
| 144 | static struct fileIdentDesc *udf_find_entry(struct inode *dir, |
| 145 | struct qstr *child, |
| 146 | struct udf_fileident_bh *fibh, |
| 147 | struct fileIdentDesc *cfi) |
| 148 | { |
| 149 | struct fileIdentDesc *fi = NULL; |
| 150 | loff_t f_pos; |
| 151 | int block, flen; |
| 152 | char *fname = NULL; |
| 153 | char *nameptr; |
| 154 | uint8_t lfi; |
| 155 | uint16_t liu; |
| 156 | loff_t size; |
| 157 | struct kernel_lb_addr eloc; |
| 158 | uint32_t elen; |
| 159 | sector_t offset; |
| 160 | struct extent_position epos = {}; |
| 161 | struct udf_inode_info *dinfo = UDF_I(dir); |
| 162 | int isdotdot = child->len == 2 && |
| 163 | child->name[0] == '.' && child->name[1] == '.'; |
| 164 | |
| 165 | size = udf_ext0_offset(dir) + dir->i_size; |
| 166 | f_pos = udf_ext0_offset(dir); |
| 167 | |
| 168 | fibh->sbh = fibh->ebh = NULL; |
| 169 | fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1); |
| 170 | if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { |
| 171 | if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos, |
| 172 | &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) |
| 173 | goto out_err; |
| 174 | block = udf_get_lb_pblock(dir->i_sb, &eloc, offset); |
| 175 | if ((++offset << dir->i_sb->s_blocksize_bits) < elen) { |
| 176 | if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) |
| 177 | epos.offset -= sizeof(struct short_ad); |
| 178 | else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) |
| 179 | epos.offset -= sizeof(struct long_ad); |
| 180 | } else |
| 181 | offset = 0; |
| 182 | |
| 183 | fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block); |
| 184 | if (!fibh->sbh) |
| 185 | goto out_err; |
| 186 | } |
| 187 | |
| 188 | fname = kmalloc(UDF_NAME_LEN, GFP_NOFS); |
| 189 | if (!fname) |
| 190 | goto out_err; |
| 191 | |
| 192 | while (f_pos < size) { |
| 193 | fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc, |
| 194 | &elen, &offset); |
| 195 | if (!fi) |
| 196 | goto out_err; |
| 197 | |
| 198 | liu = le16_to_cpu(cfi->lengthOfImpUse); |
| 199 | lfi = cfi->lengthFileIdent; |
| 200 | |
| 201 | if (fibh->sbh == fibh->ebh) { |
| 202 | nameptr = fi->fileIdent + liu; |
| 203 | } else { |
| 204 | int poffset; /* Unpaded ending offset */ |
| 205 | |
| 206 | poffset = fibh->soffset + sizeof(struct fileIdentDesc) + |
| 207 | liu + lfi; |
| 208 | |
| 209 | if (poffset >= lfi) |
| 210 | nameptr = (uint8_t *)(fibh->ebh->b_data + |
| 211 | poffset - lfi); |
| 212 | else { |
| 213 | nameptr = fname; |
| 214 | memcpy(nameptr, fi->fileIdent + liu, |
| 215 | lfi - poffset); |
| 216 | memcpy(nameptr + lfi - poffset, |
| 217 | fibh->ebh->b_data, poffset); |
| 218 | } |
| 219 | } |
| 220 | |
| 221 | if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) { |
| 222 | if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE)) |
| 223 | continue; |
| 224 | } |
| 225 | |
| 226 | if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) { |
| 227 | if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNHIDE)) |
| 228 | continue; |
| 229 | } |
| 230 | |
| 231 | if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) && |
| 232 | isdotdot) { |
| 233 | brelse(epos.bh); |
| 234 | return fi; |
| 235 | } |
| 236 | |
| 237 | if (!lfi) |
| 238 | continue; |
| 239 | |
| 240 | flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi); |
| 241 | if (flen && udf_match(flen, fname, child->len, child->name)) |
| 242 | goto out_ok; |
| 243 | } |
| 244 | |
| 245 | out_err: |
| 246 | fi = NULL; |
| 247 | if (fibh->sbh != fibh->ebh) |
| 248 | brelse(fibh->ebh); |
| 249 | brelse(fibh->sbh); |
| 250 | out_ok: |
| 251 | brelse(epos.bh); |
| 252 | kfree(fname); |
| 253 | |
| 254 | return fi; |
| 255 | } |
| 256 | |
| 257 | static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry, |
| 258 | struct nameidata *nd) |
| 259 | { |
| 260 | struct inode *inode = NULL; |
| 261 | struct fileIdentDesc cfi; |
| 262 | struct udf_fileident_bh fibh; |
| 263 | |
| 264 | if (dentry->d_name.len > UDF_NAME_LEN - 2) |
| 265 | return ERR_PTR(-ENAMETOOLONG); |
| 266 | |
| 267 | lock_kernel(); |
| 268 | #ifdef UDF_RECOVERY |
| 269 | /* temporary shorthand for specifying files by inode number */ |
| 270 | if (!strncmp(dentry->d_name.name, ".B=", 3)) { |
| 271 | struct kernel_lb_addr lb = { |
| 272 | .logicalBlockNum = 0, |
| 273 | .partitionReferenceNum = |
| 274 | simple_strtoul(dentry->d_name.name + 3, |
| 275 | NULL, 0), |
| 276 | }; |
| 277 | inode = udf_iget(dir->i_sb, lb); |
| 278 | if (!inode) { |
| 279 | unlock_kernel(); |
| 280 | return ERR_PTR(-EACCES); |
| 281 | } |
| 282 | } else |
| 283 | #endif /* UDF_RECOVERY */ |
| 284 | |
| 285 | if (udf_find_entry(dir, &dentry->d_name, &fibh, &cfi)) { |
| 286 | struct kernel_lb_addr loc; |
| 287 | |
| 288 | if (fibh.sbh != fibh.ebh) |
| 289 | brelse(fibh.ebh); |
| 290 | brelse(fibh.sbh); |
| 291 | |
| 292 | loc = lelb_to_cpu(cfi.icb.extLocation); |
| 293 | inode = udf_iget(dir->i_sb, &loc); |
| 294 | if (!inode) { |
| 295 | unlock_kernel(); |
| 296 | return ERR_PTR(-EACCES); |
| 297 | } |
| 298 | } |
| 299 | unlock_kernel(); |
| 300 | |
| 301 | return d_splice_alias(inode, dentry); |
| 302 | } |
| 303 | |
| 304 | static struct fileIdentDesc *udf_add_entry(struct inode *dir, |
| 305 | struct dentry *dentry, |
| 306 | struct udf_fileident_bh *fibh, |
| 307 | struct fileIdentDesc *cfi, int *err) |
| 308 | { |
| 309 | struct super_block *sb = dir->i_sb; |
| 310 | struct fileIdentDesc *fi = NULL; |
| 311 | char *name = NULL; |
| 312 | int namelen; |
| 313 | loff_t f_pos; |
| 314 | loff_t size = udf_ext0_offset(dir) + dir->i_size; |
| 315 | int nfidlen; |
| 316 | uint8_t lfi; |
| 317 | uint16_t liu; |
| 318 | int block; |
| 319 | struct kernel_lb_addr eloc; |
| 320 | uint32_t elen = 0; |
| 321 | sector_t offset; |
| 322 | struct extent_position epos = {}; |
| 323 | struct udf_inode_info *dinfo; |
| 324 | |
| 325 | fibh->sbh = fibh->ebh = NULL; |
| 326 | name = kmalloc(UDF_NAME_LEN, GFP_NOFS); |
| 327 | if (!name) { |
| 328 | *err = -ENOMEM; |
| 329 | goto out_err; |
| 330 | } |
| 331 | |
| 332 | if (dentry) { |
| 333 | if (!dentry->d_name.len) { |
| 334 | *err = -EINVAL; |
| 335 | goto out_err; |
| 336 | } |
| 337 | namelen = udf_put_filename(sb, dentry->d_name.name, name, |
| 338 | dentry->d_name.len); |
| 339 | if (!namelen) { |
| 340 | *err = -ENAMETOOLONG; |
| 341 | goto out_err; |
| 342 | } |
| 343 | } else { |
| 344 | namelen = 0; |
| 345 | } |
| 346 | |
| 347 | nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3; |
| 348 | |
| 349 | f_pos = udf_ext0_offset(dir); |
| 350 | |
| 351 | fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1); |
| 352 | dinfo = UDF_I(dir); |
| 353 | if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { |
| 354 | if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos, |
| 355 | &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) { |
| 356 | block = udf_get_lb_pblock(dir->i_sb, |
| 357 | &dinfo->i_location, 0); |
| 358 | fibh->soffset = fibh->eoffset = sb->s_blocksize; |
| 359 | goto add; |
| 360 | } |
| 361 | block = udf_get_lb_pblock(dir->i_sb, &eloc, offset); |
| 362 | if ((++offset << dir->i_sb->s_blocksize_bits) < elen) { |
| 363 | if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) |
| 364 | epos.offset -= sizeof(struct short_ad); |
| 365 | else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) |
| 366 | epos.offset -= sizeof(struct long_ad); |
| 367 | } else |
| 368 | offset = 0; |
| 369 | |
| 370 | fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block); |
| 371 | if (!fibh->sbh) { |
| 372 | *err = -EIO; |
| 373 | goto out_err; |
| 374 | } |
| 375 | |
| 376 | block = dinfo->i_location.logicalBlockNum; |
| 377 | } |
| 378 | |
| 379 | while (f_pos < size) { |
| 380 | fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc, |
| 381 | &elen, &offset); |
| 382 | |
| 383 | if (!fi) { |
| 384 | *err = -EIO; |
| 385 | goto out_err; |
| 386 | } |
| 387 | |
| 388 | liu = le16_to_cpu(cfi->lengthOfImpUse); |
| 389 | lfi = cfi->lengthFileIdent; |
| 390 | |
| 391 | if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) { |
| 392 | if (((sizeof(struct fileIdentDesc) + |
| 393 | liu + lfi + 3) & ~3) == nfidlen) { |
| 394 | cfi->descTag.tagSerialNum = cpu_to_le16(1); |
| 395 | cfi->fileVersionNum = cpu_to_le16(1); |
| 396 | cfi->fileCharacteristics = 0; |
| 397 | cfi->lengthFileIdent = namelen; |
| 398 | cfi->lengthOfImpUse = cpu_to_le16(0); |
| 399 | if (!udf_write_fi(dir, cfi, fi, fibh, NULL, |
| 400 | name)) |
| 401 | goto out_ok; |
| 402 | else { |
| 403 | *err = -EIO; |
| 404 | goto out_err; |
| 405 | } |
| 406 | } |
| 407 | } |
| 408 | } |
| 409 | |
| 410 | add: |
| 411 | /* Is there any extent whose size we need to round up? */ |
| 412 | if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB && elen) { |
| 413 | elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1); |
| 414 | if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) |
| 415 | epos.offset -= sizeof(struct short_ad); |
| 416 | else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) |
| 417 | epos.offset -= sizeof(struct long_ad); |
| 418 | udf_write_aext(dir, &epos, &eloc, elen, 1); |
| 419 | } |
| 420 | f_pos += nfidlen; |
| 421 | |
| 422 | if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB && |
| 423 | sb->s_blocksize - fibh->eoffset < nfidlen) { |
| 424 | brelse(epos.bh); |
| 425 | epos.bh = NULL; |
| 426 | fibh->soffset -= udf_ext0_offset(dir); |
| 427 | fibh->eoffset -= udf_ext0_offset(dir); |
| 428 | f_pos -= udf_ext0_offset(dir); |
| 429 | if (fibh->sbh != fibh->ebh) |
| 430 | brelse(fibh->ebh); |
| 431 | brelse(fibh->sbh); |
| 432 | fibh->sbh = fibh->ebh = |
| 433 | udf_expand_dir_adinicb(dir, &block, err); |
| 434 | if (!fibh->sbh) |
| 435 | goto out_err; |
| 436 | epos.block = dinfo->i_location; |
| 437 | epos.offset = udf_file_entry_alloc_offset(dir); |
| 438 | /* Load extent udf_expand_dir_adinicb() has created */ |
| 439 | udf_current_aext(dir, &epos, &eloc, &elen, 1); |
| 440 | } |
| 441 | |
| 442 | if (sb->s_blocksize - fibh->eoffset >= nfidlen) { |
| 443 | fibh->soffset = fibh->eoffset; |
| 444 | fibh->eoffset += nfidlen; |
| 445 | if (fibh->sbh != fibh->ebh) { |
| 446 | brelse(fibh->sbh); |
| 447 | fibh->sbh = fibh->ebh; |
| 448 | } |
| 449 | |
| 450 | if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { |
| 451 | block = dinfo->i_location.logicalBlockNum; |
| 452 | fi = (struct fileIdentDesc *) |
| 453 | (dinfo->i_ext.i_data + |
| 454 | fibh->soffset - |
| 455 | udf_ext0_offset(dir) + |
| 456 | dinfo->i_lenEAttr); |
| 457 | } else { |
| 458 | block = eloc.logicalBlockNum + |
| 459 | ((elen - 1) >> |
| 460 | dir->i_sb->s_blocksize_bits); |
| 461 | fi = (struct fileIdentDesc *) |
| 462 | (fibh->sbh->b_data + fibh->soffset); |
| 463 | } |
| 464 | } else { |
| 465 | fibh->soffset = fibh->eoffset - sb->s_blocksize; |
| 466 | fibh->eoffset += nfidlen - sb->s_blocksize; |
| 467 | if (fibh->sbh != fibh->ebh) { |
| 468 | brelse(fibh->sbh); |
| 469 | fibh->sbh = fibh->ebh; |
| 470 | } |
| 471 | |
| 472 | block = eloc.logicalBlockNum + ((elen - 1) >> |
| 473 | dir->i_sb->s_blocksize_bits); |
| 474 | fibh->ebh = udf_bread(dir, |
| 475 | f_pos >> dir->i_sb->s_blocksize_bits, 1, err); |
| 476 | if (!fibh->ebh) |
| 477 | goto out_err; |
| 478 | |
| 479 | if (!fibh->soffset) { |
| 480 | if (udf_next_aext(dir, &epos, &eloc, &elen, 1) == |
| 481 | (EXT_RECORDED_ALLOCATED >> 30)) { |
| 482 | block = eloc.logicalBlockNum + ((elen - 1) >> |
| 483 | dir->i_sb->s_blocksize_bits); |
| 484 | } else |
| 485 | block++; |
| 486 | |
| 487 | brelse(fibh->sbh); |
| 488 | fibh->sbh = fibh->ebh; |
| 489 | fi = (struct fileIdentDesc *)(fibh->sbh->b_data); |
| 490 | } else { |
| 491 | fi = (struct fileIdentDesc *) |
| 492 | (fibh->sbh->b_data + sb->s_blocksize + |
| 493 | fibh->soffset); |
| 494 | } |
| 495 | } |
| 496 | |
| 497 | memset(cfi, 0, sizeof(struct fileIdentDesc)); |
| 498 | if (UDF_SB(sb)->s_udfrev >= 0x0200) |
| 499 | udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block, |
| 500 | sizeof(struct tag)); |
| 501 | else |
| 502 | udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block, |
| 503 | sizeof(struct tag)); |
| 504 | cfi->fileVersionNum = cpu_to_le16(1); |
| 505 | cfi->lengthFileIdent = namelen; |
| 506 | cfi->lengthOfImpUse = cpu_to_le16(0); |
| 507 | if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) { |
| 508 | dir->i_size += nfidlen; |
| 509 | if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) |
| 510 | dinfo->i_lenAlloc += nfidlen; |
| 511 | mark_inode_dirty(dir); |
| 512 | goto out_ok; |
| 513 | } else { |
| 514 | *err = -EIO; |
| 515 | goto out_err; |
| 516 | } |
| 517 | |
| 518 | out_err: |
| 519 | fi = NULL; |
| 520 | if (fibh->sbh != fibh->ebh) |
| 521 | brelse(fibh->ebh); |
| 522 | brelse(fibh->sbh); |
| 523 | out_ok: |
| 524 | brelse(epos.bh); |
| 525 | kfree(name); |
| 526 | return fi; |
| 527 | } |
| 528 | |
| 529 | static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi, |
| 530 | struct udf_fileident_bh *fibh, |
| 531 | struct fileIdentDesc *cfi) |
| 532 | { |
| 533 | cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED; |
| 534 | |
| 535 | if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT)) |
| 536 | memset(&(cfi->icb), 0x00, sizeof(struct long_ad)); |
| 537 | |
| 538 | return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL); |
| 539 | } |
| 540 | |
| 541 | static int udf_create(struct inode *dir, struct dentry *dentry, int mode, |
| 542 | struct nameidata *nd) |
| 543 | { |
| 544 | struct udf_fileident_bh fibh; |
| 545 | struct inode *inode; |
| 546 | struct fileIdentDesc cfi, *fi; |
| 547 | int err; |
| 548 | struct udf_inode_info *iinfo; |
| 549 | |
| 550 | lock_kernel(); |
| 551 | inode = udf_new_inode(dir, mode, &err); |
| 552 | if (!inode) { |
| 553 | unlock_kernel(); |
| 554 | return err; |
| 555 | } |
| 556 | |
| 557 | iinfo = UDF_I(inode); |
| 558 | if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) |
| 559 | inode->i_data.a_ops = &udf_adinicb_aops; |
| 560 | else |
| 561 | inode->i_data.a_ops = &udf_aops; |
| 562 | inode->i_op = &udf_file_inode_operations; |
| 563 | inode->i_fop = &udf_file_operations; |
| 564 | inode->i_mode = mode; |
| 565 | mark_inode_dirty(inode); |
| 566 | |
| 567 | fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); |
| 568 | if (!fi) { |
| 569 | inode->i_nlink--; |
| 570 | mark_inode_dirty(inode); |
| 571 | iput(inode); |
| 572 | unlock_kernel(); |
| 573 | return err; |
| 574 | } |
| 575 | cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); |
| 576 | cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location); |
| 577 | *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = |
| 578 | cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); |
| 579 | udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); |
| 580 | if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) |
| 581 | mark_inode_dirty(dir); |
| 582 | if (fibh.sbh != fibh.ebh) |
| 583 | brelse(fibh.ebh); |
| 584 | brelse(fibh.sbh); |
| 585 | unlock_kernel(); |
| 586 | d_instantiate(dentry, inode); |
| 587 | |
| 588 | return 0; |
| 589 | } |
| 590 | |
| 591 | static int udf_mknod(struct inode *dir, struct dentry *dentry, int mode, |
| 592 | dev_t rdev) |
| 593 | { |
| 594 | struct inode *inode; |
| 595 | struct udf_fileident_bh fibh; |
| 596 | struct fileIdentDesc cfi, *fi; |
| 597 | int err; |
| 598 | struct udf_inode_info *iinfo; |
| 599 | |
| 600 | if (!old_valid_dev(rdev)) |
| 601 | return -EINVAL; |
| 602 | |
| 603 | lock_kernel(); |
| 604 | err = -EIO; |
| 605 | inode = udf_new_inode(dir, mode, &err); |
| 606 | if (!inode) |
| 607 | goto out; |
| 608 | |
| 609 | iinfo = UDF_I(inode); |
| 610 | inode->i_uid = current_fsuid(); |
| 611 | init_special_inode(inode, mode, rdev); |
| 612 | fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); |
| 613 | if (!fi) { |
| 614 | inode->i_nlink--; |
| 615 | mark_inode_dirty(inode); |
| 616 | iput(inode); |
| 617 | unlock_kernel(); |
| 618 | return err; |
| 619 | } |
| 620 | cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); |
| 621 | cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location); |
| 622 | *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = |
| 623 | cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); |
| 624 | udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); |
| 625 | if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) |
| 626 | mark_inode_dirty(dir); |
| 627 | mark_inode_dirty(inode); |
| 628 | |
| 629 | if (fibh.sbh != fibh.ebh) |
| 630 | brelse(fibh.ebh); |
| 631 | brelse(fibh.sbh); |
| 632 | d_instantiate(dentry, inode); |
| 633 | err = 0; |
| 634 | |
| 635 | out: |
| 636 | unlock_kernel(); |
| 637 | return err; |
| 638 | } |
| 639 | |
| 640 | static int udf_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
| 641 | { |
| 642 | struct inode *inode; |
| 643 | struct udf_fileident_bh fibh; |
| 644 | struct fileIdentDesc cfi, *fi; |
| 645 | int err; |
| 646 | struct udf_inode_info *dinfo = UDF_I(dir); |
| 647 | struct udf_inode_info *iinfo; |
| 648 | |
| 649 | lock_kernel(); |
| 650 | err = -EMLINK; |
| 651 | if (dir->i_nlink >= (256 << sizeof(dir->i_nlink)) - 1) |
| 652 | goto out; |
| 653 | |
| 654 | err = -EIO; |
| 655 | inode = udf_new_inode(dir, S_IFDIR, &err); |
| 656 | if (!inode) |
| 657 | goto out; |
| 658 | |
| 659 | iinfo = UDF_I(inode); |
| 660 | inode->i_op = &udf_dir_inode_operations; |
| 661 | inode->i_fop = &udf_dir_operations; |
| 662 | fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err); |
| 663 | if (!fi) { |
| 664 | inode->i_nlink--; |
| 665 | mark_inode_dirty(inode); |
| 666 | iput(inode); |
| 667 | goto out; |
| 668 | } |
| 669 | inode->i_nlink = 2; |
| 670 | cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); |
| 671 | cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location); |
| 672 | *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = |
| 673 | cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL); |
| 674 | cfi.fileCharacteristics = |
| 675 | FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT; |
| 676 | udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL); |
| 677 | brelse(fibh.sbh); |
| 678 | inode->i_mode = S_IFDIR | mode; |
| 679 | if (dir->i_mode & S_ISGID) |
| 680 | inode->i_mode |= S_ISGID; |
| 681 | mark_inode_dirty(inode); |
| 682 | |
| 683 | fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); |
| 684 | if (!fi) { |
| 685 | inode->i_nlink = 0; |
| 686 | mark_inode_dirty(inode); |
| 687 | iput(inode); |
| 688 | goto out; |
| 689 | } |
| 690 | cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); |
| 691 | cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location); |
| 692 | *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = |
| 693 | cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); |
| 694 | cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY; |
| 695 | udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); |
| 696 | inc_nlink(dir); |
| 697 | mark_inode_dirty(dir); |
| 698 | d_instantiate(dentry, inode); |
| 699 | if (fibh.sbh != fibh.ebh) |
| 700 | brelse(fibh.ebh); |
| 701 | brelse(fibh.sbh); |
| 702 | err = 0; |
| 703 | |
| 704 | out: |
| 705 | unlock_kernel(); |
| 706 | return err; |
| 707 | } |
| 708 | |
| 709 | static int empty_dir(struct inode *dir) |
| 710 | { |
| 711 | struct fileIdentDesc *fi, cfi; |
| 712 | struct udf_fileident_bh fibh; |
| 713 | loff_t f_pos; |
| 714 | loff_t size = udf_ext0_offset(dir) + dir->i_size; |
| 715 | int block; |
| 716 | struct kernel_lb_addr eloc; |
| 717 | uint32_t elen; |
| 718 | sector_t offset; |
| 719 | struct extent_position epos = {}; |
| 720 | struct udf_inode_info *dinfo = UDF_I(dir); |
| 721 | |
| 722 | f_pos = udf_ext0_offset(dir); |
| 723 | fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1); |
| 724 | |
| 725 | if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) |
| 726 | fibh.sbh = fibh.ebh = NULL; |
| 727 | else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, |
| 728 | &epos, &eloc, &elen, &offset) == |
| 729 | (EXT_RECORDED_ALLOCATED >> 30)) { |
| 730 | block = udf_get_lb_pblock(dir->i_sb, &eloc, offset); |
| 731 | if ((++offset << dir->i_sb->s_blocksize_bits) < elen) { |
| 732 | if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) |
| 733 | epos.offset -= sizeof(struct short_ad); |
| 734 | else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) |
| 735 | epos.offset -= sizeof(struct long_ad); |
| 736 | } else |
| 737 | offset = 0; |
| 738 | |
| 739 | fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block); |
| 740 | if (!fibh.sbh) { |
| 741 | brelse(epos.bh); |
| 742 | return 0; |
| 743 | } |
| 744 | } else { |
| 745 | brelse(epos.bh); |
| 746 | return 0; |
| 747 | } |
| 748 | |
| 749 | while (f_pos < size) { |
| 750 | fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc, |
| 751 | &elen, &offset); |
| 752 | if (!fi) { |
| 753 | if (fibh.sbh != fibh.ebh) |
| 754 | brelse(fibh.ebh); |
| 755 | brelse(fibh.sbh); |
| 756 | brelse(epos.bh); |
| 757 | return 0; |
| 758 | } |
| 759 | |
| 760 | if (cfi.lengthFileIdent && |
| 761 | (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) { |
| 762 | if (fibh.sbh != fibh.ebh) |
| 763 | brelse(fibh.ebh); |
| 764 | brelse(fibh.sbh); |
| 765 | brelse(epos.bh); |
| 766 | return 0; |
| 767 | } |
| 768 | } |
| 769 | |
| 770 | if (fibh.sbh != fibh.ebh) |
| 771 | brelse(fibh.ebh); |
| 772 | brelse(fibh.sbh); |
| 773 | brelse(epos.bh); |
| 774 | |
| 775 | return 1; |
| 776 | } |
| 777 | |
| 778 | static int udf_rmdir(struct inode *dir, struct dentry *dentry) |
| 779 | { |
| 780 | int retval; |
| 781 | struct inode *inode = dentry->d_inode; |
| 782 | struct udf_fileident_bh fibh; |
| 783 | struct fileIdentDesc *fi, cfi; |
| 784 | struct kernel_lb_addr tloc; |
| 785 | |
| 786 | retval = -ENOENT; |
| 787 | lock_kernel(); |
| 788 | fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi); |
| 789 | if (!fi) |
| 790 | goto out; |
| 791 | |
| 792 | retval = -EIO; |
| 793 | tloc = lelb_to_cpu(cfi.icb.extLocation); |
| 794 | if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) |
| 795 | goto end_rmdir; |
| 796 | retval = -ENOTEMPTY; |
| 797 | if (!empty_dir(inode)) |
| 798 | goto end_rmdir; |
| 799 | retval = udf_delete_entry(dir, fi, &fibh, &cfi); |
| 800 | if (retval) |
| 801 | goto end_rmdir; |
| 802 | if (inode->i_nlink != 2) |
| 803 | udf_warning(inode->i_sb, "udf_rmdir", |
| 804 | "empty directory has nlink != 2 (%d)", |
| 805 | inode->i_nlink); |
| 806 | clear_nlink(inode); |
| 807 | inode->i_size = 0; |
| 808 | inode_dec_link_count(dir); |
| 809 | inode->i_ctime = dir->i_ctime = dir->i_mtime = |
| 810 | current_fs_time(dir->i_sb); |
| 811 | mark_inode_dirty(dir); |
| 812 | |
| 813 | end_rmdir: |
| 814 | if (fibh.sbh != fibh.ebh) |
| 815 | brelse(fibh.ebh); |
| 816 | brelse(fibh.sbh); |
| 817 | |
| 818 | out: |
| 819 | unlock_kernel(); |
| 820 | return retval; |
| 821 | } |
| 822 | |
| 823 | static int udf_unlink(struct inode *dir, struct dentry *dentry) |
| 824 | { |
| 825 | int retval; |
| 826 | struct inode *inode = dentry->d_inode; |
| 827 | struct udf_fileident_bh fibh; |
| 828 | struct fileIdentDesc *fi; |
| 829 | struct fileIdentDesc cfi; |
| 830 | struct kernel_lb_addr tloc; |
| 831 | |
| 832 | retval = -ENOENT; |
| 833 | lock_kernel(); |
| 834 | fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi); |
| 835 | if (!fi) |
| 836 | goto out; |
| 837 | |
| 838 | retval = -EIO; |
| 839 | tloc = lelb_to_cpu(cfi.icb.extLocation); |
| 840 | if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) |
| 841 | goto end_unlink; |
| 842 | |
| 843 | if (!inode->i_nlink) { |
| 844 | udf_debug("Deleting nonexistent file (%lu), %d\n", |
| 845 | inode->i_ino, inode->i_nlink); |
| 846 | inode->i_nlink = 1; |
| 847 | } |
| 848 | retval = udf_delete_entry(dir, fi, &fibh, &cfi); |
| 849 | if (retval) |
| 850 | goto end_unlink; |
| 851 | dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb); |
| 852 | mark_inode_dirty(dir); |
| 853 | inode_dec_link_count(inode); |
| 854 | inode->i_ctime = dir->i_ctime; |
| 855 | retval = 0; |
| 856 | |
| 857 | end_unlink: |
| 858 | if (fibh.sbh != fibh.ebh) |
| 859 | brelse(fibh.ebh); |
| 860 | brelse(fibh.sbh); |
| 861 | |
| 862 | out: |
| 863 | unlock_kernel(); |
| 864 | return retval; |
| 865 | } |
| 866 | |
| 867 | static int udf_symlink(struct inode *dir, struct dentry *dentry, |
| 868 | const char *symname) |
| 869 | { |
| 870 | struct inode *inode; |
| 871 | struct pathComponent *pc; |
| 872 | char *compstart; |
| 873 | struct udf_fileident_bh fibh; |
| 874 | struct extent_position epos = {}; |
| 875 | int eoffset, elen = 0; |
| 876 | struct fileIdentDesc *fi; |
| 877 | struct fileIdentDesc cfi; |
| 878 | char *ea; |
| 879 | int err; |
| 880 | int block; |
| 881 | char *name = NULL; |
| 882 | int namelen; |
| 883 | struct buffer_head *bh; |
| 884 | struct udf_inode_info *iinfo; |
| 885 | |
| 886 | lock_kernel(); |
| 887 | inode = udf_new_inode(dir, S_IFLNK, &err); |
| 888 | if (!inode) |
| 889 | goto out; |
| 890 | |
| 891 | name = kmalloc(UDF_NAME_LEN, GFP_NOFS); |
| 892 | if (!name) { |
| 893 | err = -ENOMEM; |
| 894 | goto out_no_entry; |
| 895 | } |
| 896 | |
| 897 | iinfo = UDF_I(inode); |
| 898 | inode->i_mode = S_IFLNK | S_IRWXUGO; |
| 899 | inode->i_data.a_ops = &udf_symlink_aops; |
| 900 | inode->i_op = &page_symlink_inode_operations; |
| 901 | |
| 902 | if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { |
| 903 | struct kernel_lb_addr eloc; |
| 904 | uint32_t bsize; |
| 905 | |
| 906 | block = udf_new_block(inode->i_sb, inode, |
| 907 | iinfo->i_location.partitionReferenceNum, |
| 908 | iinfo->i_location.logicalBlockNum, &err); |
| 909 | if (!block) |
| 910 | goto out_no_entry; |
| 911 | epos.block = iinfo->i_location; |
| 912 | epos.offset = udf_file_entry_alloc_offset(inode); |
| 913 | epos.bh = NULL; |
| 914 | eloc.logicalBlockNum = block; |
| 915 | eloc.partitionReferenceNum = |
| 916 | iinfo->i_location.partitionReferenceNum; |
| 917 | bsize = inode->i_sb->s_blocksize; |
| 918 | iinfo->i_lenExtents = bsize; |
| 919 | udf_add_aext(inode, &epos, &eloc, bsize, 0); |
| 920 | brelse(epos.bh); |
| 921 | |
| 922 | block = udf_get_pblock(inode->i_sb, block, |
| 923 | iinfo->i_location.partitionReferenceNum, |
| 924 | 0); |
| 925 | epos.bh = udf_tread(inode->i_sb, block); |
| 926 | lock_buffer(epos.bh); |
| 927 | memset(epos.bh->b_data, 0x00, inode->i_sb->s_blocksize); |
| 928 | set_buffer_uptodate(epos.bh); |
| 929 | unlock_buffer(epos.bh); |
| 930 | mark_buffer_dirty_inode(epos.bh, inode); |
| 931 | ea = epos.bh->b_data + udf_ext0_offset(inode); |
| 932 | } else |
| 933 | ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr; |
| 934 | |
| 935 | eoffset = inode->i_sb->s_blocksize - udf_ext0_offset(inode); |
| 936 | pc = (struct pathComponent *)ea; |
| 937 | |
| 938 | if (*symname == '/') { |
| 939 | do { |
| 940 | symname++; |
| 941 | } while (*symname == '/'); |
| 942 | |
| 943 | pc->componentType = 1; |
| 944 | pc->lengthComponentIdent = 0; |
| 945 | pc->componentFileVersionNum = 0; |
| 946 | elen += sizeof(struct pathComponent); |
| 947 | } |
| 948 | |
| 949 | err = -ENAMETOOLONG; |
| 950 | |
| 951 | while (*symname) { |
| 952 | if (elen + sizeof(struct pathComponent) > eoffset) |
| 953 | goto out_no_entry; |
| 954 | |
| 955 | pc = (struct pathComponent *)(ea + elen); |
| 956 | |
| 957 | compstart = (char *)symname; |
| 958 | |
| 959 | do { |
| 960 | symname++; |
| 961 | } while (*symname && *symname != '/'); |
| 962 | |
| 963 | pc->componentType = 5; |
| 964 | pc->lengthComponentIdent = 0; |
| 965 | pc->componentFileVersionNum = 0; |
| 966 | if (compstart[0] == '.') { |
| 967 | if ((symname - compstart) == 1) |
| 968 | pc->componentType = 4; |
| 969 | else if ((symname - compstart) == 2 && |
| 970 | compstart[1] == '.') |
| 971 | pc->componentType = 3; |
| 972 | } |
| 973 | |
| 974 | if (pc->componentType == 5) { |
| 975 | namelen = udf_put_filename(inode->i_sb, compstart, name, |
| 976 | symname - compstart); |
| 977 | if (!namelen) |
| 978 | goto out_no_entry; |
| 979 | |
| 980 | if (elen + sizeof(struct pathComponent) + namelen > |
| 981 | eoffset) |
| 982 | goto out_no_entry; |
| 983 | else |
| 984 | pc->lengthComponentIdent = namelen; |
| 985 | |
| 986 | memcpy(pc->componentIdent, name, namelen); |
| 987 | } |
| 988 | |
| 989 | elen += sizeof(struct pathComponent) + pc->lengthComponentIdent; |
| 990 | |
| 991 | if (*symname) { |
| 992 | do { |
| 993 | symname++; |
| 994 | } while (*symname == '/'); |
| 995 | } |
| 996 | } |
| 997 | |
| 998 | brelse(epos.bh); |
| 999 | inode->i_size = elen; |
| 1000 | if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) |
| 1001 | iinfo->i_lenAlloc = inode->i_size; |
| 1002 | mark_inode_dirty(inode); |
| 1003 | |
| 1004 | fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); |
| 1005 | if (!fi) |
| 1006 | goto out_no_entry; |
| 1007 | cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); |
| 1008 | cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location); |
| 1009 | bh = UDF_SB(inode->i_sb)->s_lvid_bh; |
| 1010 | if (bh) { |
| 1011 | struct logicalVolIntegrityDesc *lvid = |
| 1012 | (struct logicalVolIntegrityDesc *)bh->b_data; |
| 1013 | struct logicalVolHeaderDesc *lvhd; |
| 1014 | uint64_t uniqueID; |
| 1015 | lvhd = (struct logicalVolHeaderDesc *) |
| 1016 | lvid->logicalVolContentsUse; |
| 1017 | uniqueID = le64_to_cpu(lvhd->uniqueID); |
| 1018 | *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = |
| 1019 | cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL); |
| 1020 | if (!(++uniqueID & 0x00000000FFFFFFFFUL)) |
| 1021 | uniqueID += 16; |
| 1022 | lvhd->uniqueID = cpu_to_le64(uniqueID); |
| 1023 | mark_buffer_dirty(bh); |
| 1024 | } |
| 1025 | udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); |
| 1026 | if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) |
| 1027 | mark_inode_dirty(dir); |
| 1028 | if (fibh.sbh != fibh.ebh) |
| 1029 | brelse(fibh.ebh); |
| 1030 | brelse(fibh.sbh); |
| 1031 | d_instantiate(dentry, inode); |
| 1032 | err = 0; |
| 1033 | |
| 1034 | out: |
| 1035 | kfree(name); |
| 1036 | unlock_kernel(); |
| 1037 | return err; |
| 1038 | |
| 1039 | out_no_entry: |
| 1040 | inode_dec_link_count(inode); |
| 1041 | iput(inode); |
| 1042 | goto out; |
| 1043 | } |
| 1044 | |
| 1045 | static int udf_link(struct dentry *old_dentry, struct inode *dir, |
| 1046 | struct dentry *dentry) |
| 1047 | { |
| 1048 | struct inode *inode = old_dentry->d_inode; |
| 1049 | struct udf_fileident_bh fibh; |
| 1050 | struct fileIdentDesc cfi, *fi; |
| 1051 | int err; |
| 1052 | struct buffer_head *bh; |
| 1053 | |
| 1054 | lock_kernel(); |
| 1055 | if (inode->i_nlink >= (256 << sizeof(inode->i_nlink)) - 1) { |
| 1056 | unlock_kernel(); |
| 1057 | return -EMLINK; |
| 1058 | } |
| 1059 | |
| 1060 | fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); |
| 1061 | if (!fi) { |
| 1062 | unlock_kernel(); |
| 1063 | return err; |
| 1064 | } |
| 1065 | cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); |
| 1066 | cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location); |
| 1067 | bh = UDF_SB(inode->i_sb)->s_lvid_bh; |
| 1068 | if (bh) { |
| 1069 | struct logicalVolIntegrityDesc *lvid = |
| 1070 | (struct logicalVolIntegrityDesc *)bh->b_data; |
| 1071 | struct logicalVolHeaderDesc *lvhd; |
| 1072 | uint64_t uniqueID; |
| 1073 | lvhd = (struct logicalVolHeaderDesc *) |
| 1074 | (lvid->logicalVolContentsUse); |
| 1075 | uniqueID = le64_to_cpu(lvhd->uniqueID); |
| 1076 | *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = |
| 1077 | cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL); |
| 1078 | if (!(++uniqueID & 0x00000000FFFFFFFFUL)) |
| 1079 | uniqueID += 16; |
| 1080 | lvhd->uniqueID = cpu_to_le64(uniqueID); |
| 1081 | mark_buffer_dirty(bh); |
| 1082 | } |
| 1083 | udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); |
| 1084 | if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) |
| 1085 | mark_inode_dirty(dir); |
| 1086 | |
| 1087 | if (fibh.sbh != fibh.ebh) |
| 1088 | brelse(fibh.ebh); |
| 1089 | brelse(fibh.sbh); |
| 1090 | inc_nlink(inode); |
| 1091 | inode->i_ctime = current_fs_time(inode->i_sb); |
| 1092 | mark_inode_dirty(inode); |
| 1093 | atomic_inc(&inode->i_count); |
| 1094 | d_instantiate(dentry, inode); |
| 1095 | unlock_kernel(); |
| 1096 | |
| 1097 | return 0; |
| 1098 | } |
| 1099 | |
| 1100 | /* Anybody can rename anything with this: the permission checks are left to the |
| 1101 | * higher-level routines. |
| 1102 | */ |
| 1103 | static int udf_rename(struct inode *old_dir, struct dentry *old_dentry, |
| 1104 | struct inode *new_dir, struct dentry *new_dentry) |
| 1105 | { |
| 1106 | struct inode *old_inode = old_dentry->d_inode; |
| 1107 | struct inode *new_inode = new_dentry->d_inode; |
| 1108 | struct udf_fileident_bh ofibh, nfibh; |
| 1109 | struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL; |
| 1110 | struct fileIdentDesc ocfi, ncfi; |
| 1111 | struct buffer_head *dir_bh = NULL; |
| 1112 | int retval = -ENOENT; |
| 1113 | struct kernel_lb_addr tloc; |
| 1114 | struct udf_inode_info *old_iinfo = UDF_I(old_inode); |
| 1115 | |
| 1116 | lock_kernel(); |
| 1117 | ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi); |
| 1118 | if (ofi) { |
| 1119 | if (ofibh.sbh != ofibh.ebh) |
| 1120 | brelse(ofibh.ebh); |
| 1121 | brelse(ofibh.sbh); |
| 1122 | } |
| 1123 | tloc = lelb_to_cpu(ocfi.icb.extLocation); |
| 1124 | if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0) |
| 1125 | != old_inode->i_ino) |
| 1126 | goto end_rename; |
| 1127 | |
| 1128 | nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi); |
| 1129 | if (nfi) { |
| 1130 | if (!new_inode) { |
| 1131 | if (nfibh.sbh != nfibh.ebh) |
| 1132 | brelse(nfibh.ebh); |
| 1133 | brelse(nfibh.sbh); |
| 1134 | nfi = NULL; |
| 1135 | } |
| 1136 | } |
| 1137 | if (S_ISDIR(old_inode->i_mode)) { |
| 1138 | int offset = udf_ext0_offset(old_inode); |
| 1139 | |
| 1140 | if (new_inode) { |
| 1141 | retval = -ENOTEMPTY; |
| 1142 | if (!empty_dir(new_inode)) |
| 1143 | goto end_rename; |
| 1144 | } |
| 1145 | retval = -EIO; |
| 1146 | if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { |
| 1147 | dir_fi = udf_get_fileident( |
| 1148 | old_iinfo->i_ext.i_data - |
| 1149 | (old_iinfo->i_efe ? |
| 1150 | sizeof(struct extendedFileEntry) : |
| 1151 | sizeof(struct fileEntry)), |
| 1152 | old_inode->i_sb->s_blocksize, &offset); |
| 1153 | } else { |
| 1154 | dir_bh = udf_bread(old_inode, 0, 0, &retval); |
| 1155 | if (!dir_bh) |
| 1156 | goto end_rename; |
| 1157 | dir_fi = udf_get_fileident(dir_bh->b_data, |
| 1158 | old_inode->i_sb->s_blocksize, &offset); |
| 1159 | } |
| 1160 | if (!dir_fi) |
| 1161 | goto end_rename; |
| 1162 | tloc = lelb_to_cpu(dir_fi->icb.extLocation); |
| 1163 | if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) != |
| 1164 | old_dir->i_ino) |
| 1165 | goto end_rename; |
| 1166 | |
| 1167 | retval = -EMLINK; |
| 1168 | if (!new_inode && |
| 1169 | new_dir->i_nlink >= |
| 1170 | (256 << sizeof(new_dir->i_nlink)) - 1) |
| 1171 | goto end_rename; |
| 1172 | } |
| 1173 | if (!nfi) { |
| 1174 | nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi, |
| 1175 | &retval); |
| 1176 | if (!nfi) |
| 1177 | goto end_rename; |
| 1178 | } |
| 1179 | |
| 1180 | /* |
| 1181 | * Like most other Unix systems, set the ctime for inodes on a |
| 1182 | * rename. |
| 1183 | */ |
| 1184 | old_inode->i_ctime = current_fs_time(old_inode->i_sb); |
| 1185 | mark_inode_dirty(old_inode); |
| 1186 | |
| 1187 | /* |
| 1188 | * ok, that's it |
| 1189 | */ |
| 1190 | ncfi.fileVersionNum = ocfi.fileVersionNum; |
| 1191 | ncfi.fileCharacteristics = ocfi.fileCharacteristics; |
| 1192 | memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(struct long_ad)); |
| 1193 | udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL); |
| 1194 | |
| 1195 | /* The old fid may have moved - find it again */ |
| 1196 | ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi); |
| 1197 | udf_delete_entry(old_dir, ofi, &ofibh, &ocfi); |
| 1198 | |
| 1199 | if (new_inode) { |
| 1200 | new_inode->i_ctime = current_fs_time(new_inode->i_sb); |
| 1201 | inode_dec_link_count(new_inode); |
| 1202 | } |
| 1203 | old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb); |
| 1204 | mark_inode_dirty(old_dir); |
| 1205 | |
| 1206 | if (dir_fi) { |
| 1207 | dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location); |
| 1208 | udf_update_tag((char *)dir_fi, |
| 1209 | (sizeof(struct fileIdentDesc) + |
| 1210 | le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3); |
| 1211 | if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) |
| 1212 | mark_inode_dirty(old_inode); |
| 1213 | else |
| 1214 | mark_buffer_dirty_inode(dir_bh, old_inode); |
| 1215 | |
| 1216 | inode_dec_link_count(old_dir); |
| 1217 | if (new_inode) |
| 1218 | inode_dec_link_count(new_inode); |
| 1219 | else { |
| 1220 | inc_nlink(new_dir); |
| 1221 | mark_inode_dirty(new_dir); |
| 1222 | } |
| 1223 | } |
| 1224 | |
| 1225 | if (ofi) { |
| 1226 | if (ofibh.sbh != ofibh.ebh) |
| 1227 | brelse(ofibh.ebh); |
| 1228 | brelse(ofibh.sbh); |
| 1229 | } |
| 1230 | |
| 1231 | retval = 0; |
| 1232 | |
| 1233 | end_rename: |
| 1234 | brelse(dir_bh); |
| 1235 | if (nfi) { |
| 1236 | if (nfibh.sbh != nfibh.ebh) |
| 1237 | brelse(nfibh.ebh); |
| 1238 | brelse(nfibh.sbh); |
| 1239 | } |
| 1240 | unlock_kernel(); |
| 1241 | |
| 1242 | return retval; |
| 1243 | } |
| 1244 | |
| 1245 | static struct dentry *udf_get_parent(struct dentry *child) |
| 1246 | { |
| 1247 | struct kernel_lb_addr tloc; |
| 1248 | struct inode *inode = NULL; |
| 1249 | struct qstr dotdot = {.name = "..", .len = 2}; |
| 1250 | struct fileIdentDesc cfi; |
| 1251 | struct udf_fileident_bh fibh; |
| 1252 | |
| 1253 | lock_kernel(); |
| 1254 | if (!udf_find_entry(child->d_inode, &dotdot, &fibh, &cfi)) |
| 1255 | goto out_unlock; |
| 1256 | |
| 1257 | if (fibh.sbh != fibh.ebh) |
| 1258 | brelse(fibh.ebh); |
| 1259 | brelse(fibh.sbh); |
| 1260 | |
| 1261 | tloc = lelb_to_cpu(cfi.icb.extLocation); |
| 1262 | inode = udf_iget(child->d_inode->i_sb, &tloc); |
| 1263 | if (!inode) |
| 1264 | goto out_unlock; |
| 1265 | unlock_kernel(); |
| 1266 | |
| 1267 | return d_obtain_alias(inode); |
| 1268 | out_unlock: |
| 1269 | unlock_kernel(); |
| 1270 | return ERR_PTR(-EACCES); |
| 1271 | } |
| 1272 | |
| 1273 | |
| 1274 | static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block, |
| 1275 | u16 partref, __u32 generation) |
| 1276 | { |
| 1277 | struct inode *inode; |
| 1278 | struct kernel_lb_addr loc; |
| 1279 | |
| 1280 | if (block == 0) |
| 1281 | return ERR_PTR(-ESTALE); |
| 1282 | |
| 1283 | loc.logicalBlockNum = block; |
| 1284 | loc.partitionReferenceNum = partref; |
| 1285 | inode = udf_iget(sb, &loc); |
| 1286 | |
| 1287 | if (inode == NULL) |
| 1288 | return ERR_PTR(-ENOMEM); |
| 1289 | |
| 1290 | if (generation && inode->i_generation != generation) { |
| 1291 | iput(inode); |
| 1292 | return ERR_PTR(-ESTALE); |
| 1293 | } |
| 1294 | return d_obtain_alias(inode); |
| 1295 | } |
| 1296 | |
| 1297 | static struct dentry *udf_fh_to_dentry(struct super_block *sb, |
| 1298 | struct fid *fid, int fh_len, int fh_type) |
| 1299 | { |
| 1300 | if ((fh_len != 3 && fh_len != 5) || |
| 1301 | (fh_type != FILEID_UDF_WITH_PARENT && |
| 1302 | fh_type != FILEID_UDF_WITHOUT_PARENT)) |
| 1303 | return NULL; |
| 1304 | |
| 1305 | return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref, |
| 1306 | fid->udf.generation); |
| 1307 | } |
| 1308 | |
| 1309 | static struct dentry *udf_fh_to_parent(struct super_block *sb, |
| 1310 | struct fid *fid, int fh_len, int fh_type) |
| 1311 | { |
| 1312 | if (fh_len != 5 || fh_type != FILEID_UDF_WITH_PARENT) |
| 1313 | return NULL; |
| 1314 | |
| 1315 | return udf_nfs_get_inode(sb, fid->udf.parent_block, |
| 1316 | fid->udf.parent_partref, |
| 1317 | fid->udf.parent_generation); |
| 1318 | } |
| 1319 | static int udf_encode_fh(struct dentry *de, __u32 *fh, int *lenp, |
| 1320 | int connectable) |
| 1321 | { |
| 1322 | int len = *lenp; |
| 1323 | struct inode *inode = de->d_inode; |
| 1324 | struct kernel_lb_addr location = UDF_I(inode)->i_location; |
| 1325 | struct fid *fid = (struct fid *)fh; |
| 1326 | int type = FILEID_UDF_WITHOUT_PARENT; |
| 1327 | |
| 1328 | if (len < 3 || (connectable && len < 5)) |
| 1329 | return 255; |
| 1330 | |
| 1331 | *lenp = 3; |
| 1332 | fid->udf.block = location.logicalBlockNum; |
| 1333 | fid->udf.partref = location.partitionReferenceNum; |
| 1334 | fid->udf.generation = inode->i_generation; |
| 1335 | |
| 1336 | if (connectable && !S_ISDIR(inode->i_mode)) { |
| 1337 | spin_lock(&de->d_lock); |
| 1338 | inode = de->d_parent->d_inode; |
| 1339 | location = UDF_I(inode)->i_location; |
| 1340 | fid->udf.parent_block = location.logicalBlockNum; |
| 1341 | fid->udf.parent_partref = location.partitionReferenceNum; |
| 1342 | fid->udf.parent_generation = inode->i_generation; |
| 1343 | spin_unlock(&de->d_lock); |
| 1344 | *lenp = 5; |
| 1345 | type = FILEID_UDF_WITH_PARENT; |
| 1346 | } |
| 1347 | |
| 1348 | return type; |
| 1349 | } |
| 1350 | |
| 1351 | const struct export_operations udf_export_ops = { |
| 1352 | .encode_fh = udf_encode_fh, |
| 1353 | .fh_to_dentry = udf_fh_to_dentry, |
| 1354 | .fh_to_parent = udf_fh_to_parent, |
| 1355 | .get_parent = udf_get_parent, |
| 1356 | }; |
| 1357 | |
| 1358 | const struct inode_operations udf_dir_inode_operations = { |
| 1359 | .lookup = udf_lookup, |
| 1360 | .create = udf_create, |
| 1361 | .link = udf_link, |
| 1362 | .unlink = udf_unlink, |
| 1363 | .symlink = udf_symlink, |
| 1364 | .mkdir = udf_mkdir, |
| 1365 | .rmdir = udf_rmdir, |
| 1366 | .mknod = udf_mknod, |
| 1367 | .rename = udf_rename, |
| 1368 | }; |