1 /* 2 * JFFS2 -- Journalling Flash File System, Version 2. 3 * 4 * Copyright © 2001-2007 Red Hat, Inc. 5 * 6 * Created by David Woodhouse <dwmw2@infradead.org> 7 * 8 * For licensing information, see the file 'LICENCE' in this directory. 9 * 10 */ 11 12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 13 14 #include <linux/kernel.h> 15 #include <linux/fs.h> 16 #include <linux/crc32.h> 17 #include <linux/pagemap.h> 18 #include <linux/mtd/mtd.h> 19 #include "nodelist.h" 20 #include "compr.h" 21 22 23 int jffs2_do_new_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, 24 uint32_t mode, struct jffs2_raw_inode *ri) 25 { 26 struct jffs2_inode_cache *ic; 27 28 ic = jffs2_alloc_inode_cache(); 29 if (!ic) { 30 return -ENOMEM; 31 } 32 33 memset(ic, 0, sizeof(*ic)); 34 35 f->inocache = ic; 36 f->inocache->pino_nlink = 1; /* Will be overwritten shortly for directories */ 37 f->inocache->nodes = (struct jffs2_raw_node_ref *)f->inocache; 38 f->inocache->state = INO_STATE_PRESENT; 39 40 jffs2_add_ino_cache(c, f->inocache); 41 jffs2_dbg(1, "%s(): Assigned ino# %d\n", __func__, f->inocache->ino); 42 ri->ino = cpu_to_je32(f->inocache->ino); 43 44 ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 45 ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE); 46 ri->totlen = cpu_to_je32(PAD(sizeof(*ri))); 47 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 48 ri->mode = cpu_to_jemode(mode); 49 50 f->highest_version = 1; 51 ri->version = cpu_to_je32(f->highest_version); 52 53 return 0; 54 } 55 56 /* jffs2_write_dnode - given a raw_inode, allocate a full_dnode for it, 57 write it to the flash, link it into the existing inode/fragment list */ 58 59 struct jffs2_full_dnode *jffs2_write_dnode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, 60 struct jffs2_raw_inode *ri, const unsigned char *data, 61 uint32_t datalen, int alloc_mode) 62 63 { 64 struct jffs2_full_dnode *fn; 65 size_t retlen; 66 uint32_t flash_ofs; 67 struct kvec vecs[2]; 68 int ret; 69 int retried = 0; 70 unsigned long cnt = 2; 71 72 D1(if(je32_to_cpu(ri->hdr_crc) != crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)) { 73 pr_crit("Eep. CRC not correct in jffs2_write_dnode()\n"); 74 BUG(); 75 } 76 ); 77 vecs[0].iov_base = ri; 78 vecs[0].iov_len = sizeof(*ri); 79 vecs[1].iov_base = (unsigned char *)data; 80 vecs[1].iov_len = datalen; 81 82 if (je32_to_cpu(ri->totlen) != sizeof(*ri) + datalen) { 83 pr_warn("%s(): ri->totlen (0x%08x) != sizeof(*ri) (0x%08zx) + datalen (0x%08x)\n", 84 __func__, je32_to_cpu(ri->totlen), 85 sizeof(*ri), datalen); 86 } 87 88 fn = jffs2_alloc_full_dnode(); 89 if (!fn) 90 return ERR_PTR(-ENOMEM); 91 92 /* check number of valid vecs */ 93 if (!datalen || !data) 94 cnt = 1; 95 retry: 96 flash_ofs = write_ofs(c); 97 98 jffs2_dbg_prewrite_paranoia_check(c, flash_ofs, vecs[0].iov_len + vecs[1].iov_len); 99 100 if ((alloc_mode!=ALLOC_GC) && (je32_to_cpu(ri->version) < f->highest_version)) { 101 BUG_ON(!retried); 102 jffs2_dbg(1, "%s(): dnode_version %d, highest version %d -> updating dnode\n", 103 __func__, 104 je32_to_cpu(ri->version), f->highest_version); 105 ri->version = cpu_to_je32(++f->highest_version); 106 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 107 } 108 109 ret = jffs2_flash_writev(c, vecs, cnt, flash_ofs, &retlen, 110 (alloc_mode==ALLOC_GC)?0:f->inocache->ino); 111 112 if (ret || (retlen != sizeof(*ri) + datalen)) { 113 pr_notice("Write of %zd bytes at 0x%08x failed. returned %d, retlen %zd\n", 114 sizeof(*ri) + datalen, flash_ofs, ret, retlen); 115 116 /* Mark the space as dirtied */ 117 if (retlen) { 118 /* Don't change raw->size to match retlen. We may have 119 written the node header already, and only the data will 120 seem corrupted, in which case the scan would skip over 121 any node we write before the original intended end of 122 this node */ 123 jffs2_add_physical_node_ref(c, flash_ofs | REF_OBSOLETE, PAD(sizeof(*ri)+datalen), NULL); 124 } else { 125 pr_notice("Not marking the space at 0x%08x as dirty because the flash driver returned retlen zero\n", 126 flash_ofs); 127 } 128 if (!retried && alloc_mode != ALLOC_NORETRY) { 129 /* Try to reallocate space and retry */ 130 uint32_t dummy; 131 struct jffs2_eraseblock *jeb = &c->blocks[flash_ofs / c->sector_size]; 132 133 retried = 1; 134 135 jffs2_dbg(1, "Retrying failed write.\n"); 136 137 jffs2_dbg_acct_sanity_check(c,jeb); 138 jffs2_dbg_acct_paranoia_check(c, jeb); 139 140 if (alloc_mode == ALLOC_GC) { 141 ret = jffs2_reserve_space_gc(c, sizeof(*ri) + datalen, &dummy, 142 JFFS2_SUMMARY_INODE_SIZE); 143 } else { 144 /* Locking pain */ 145 mutex_unlock(&f->sem); 146 jffs2_complete_reservation(c); 147 148 ret = jffs2_reserve_space(c, sizeof(*ri) + datalen, &dummy, 149 alloc_mode, JFFS2_SUMMARY_INODE_SIZE); 150 mutex_lock(&f->sem); 151 } 152 153 if (!ret) { 154 flash_ofs = write_ofs(c); 155 jffs2_dbg(1, "Allocated space at 0x%08x to retry failed write.\n", 156 flash_ofs); 157 158 jffs2_dbg_acct_sanity_check(c,jeb); 159 jffs2_dbg_acct_paranoia_check(c, jeb); 160 161 goto retry; 162 } 163 jffs2_dbg(1, "Failed to allocate space to retry failed write: %d!\n", 164 ret); 165 } 166 /* Release the full_dnode which is now useless, and return */ 167 jffs2_free_full_dnode(fn); 168 return ERR_PTR(ret?ret:-EIO); 169 } 170 /* Mark the space used */ 171 /* If node covers at least a whole page, or if it starts at the 172 beginning of a page and runs to the end of the file, or if 173 it's a hole node, mark it REF_PRISTINE, else REF_NORMAL. 174 */ 175 if ((je32_to_cpu(ri->dsize) >= PAGE_SIZE) || 176 ( ((je32_to_cpu(ri->offset)&(PAGE_SIZE-1))==0) && 177 (je32_to_cpu(ri->dsize)+je32_to_cpu(ri->offset) == je32_to_cpu(ri->isize)))) { 178 flash_ofs |= REF_PRISTINE; 179 } else { 180 flash_ofs |= REF_NORMAL; 181 } 182 fn->raw = jffs2_add_physical_node_ref(c, flash_ofs, PAD(sizeof(*ri)+datalen), f->inocache); 183 if (IS_ERR(fn->raw)) { 184 void *hold_err = fn->raw; 185 /* Release the full_dnode which is now useless, and return */ 186 jffs2_free_full_dnode(fn); 187 return ERR_CAST(hold_err); 188 } 189 fn->ofs = je32_to_cpu(ri->offset); 190 fn->size = je32_to_cpu(ri->dsize); 191 fn->frags = 0; 192 193 jffs2_dbg(1, "jffs2_write_dnode wrote node at 0x%08x(%d) with dsize 0x%x, csize 0x%x, node_crc 0x%08x, data_crc 0x%08x, totlen 0x%08x\n", 194 flash_ofs & ~3, flash_ofs & 3, je32_to_cpu(ri->dsize), 195 je32_to_cpu(ri->csize), je32_to_cpu(ri->node_crc), 196 je32_to_cpu(ri->data_crc), je32_to_cpu(ri->totlen)); 197 198 if (retried) { 199 jffs2_dbg_acct_sanity_check(c,NULL); 200 } 201 202 return fn; 203 } 204 205 struct jffs2_full_dirent *jffs2_write_dirent(struct jffs2_sb_info *c, struct jffs2_inode_info *f, 206 struct jffs2_raw_dirent *rd, const unsigned char *name, 207 uint32_t namelen, int alloc_mode) 208 { 209 struct jffs2_full_dirent *fd; 210 size_t retlen; 211 struct kvec vecs[2]; 212 uint32_t flash_ofs; 213 int retried = 0; 214 int ret; 215 216 jffs2_dbg(1, "%s(ino #%u, name at *0x%p \"%s\"->ino #%u, name_crc 0x%08x)\n", 217 __func__, 218 je32_to_cpu(rd->pino), name, name, je32_to_cpu(rd->ino), 219 je32_to_cpu(rd->name_crc)); 220 221 D1(if(je32_to_cpu(rd->hdr_crc) != crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)) { 222 pr_crit("Eep. CRC not correct in jffs2_write_dirent()\n"); 223 BUG(); 224 }); 225 226 if (strnlen(name, namelen) != namelen) { 227 /* This should never happen, but seems to have done on at least one 228 occasion: https://dev.laptop.org/ticket/4184 */ 229 pr_crit("Error in jffs2_write_dirent() -- name contains zero bytes!\n"); 230 pr_crit("Directory inode #%u, name at *0x%p \"%s\"->ino #%u, name_crc 0x%08x\n", 231 je32_to_cpu(rd->pino), name, name, je32_to_cpu(rd->ino), 232 je32_to_cpu(rd->name_crc)); 233 WARN_ON(1); 234 return ERR_PTR(-EIO); 235 } 236 237 vecs[0].iov_base = rd; 238 vecs[0].iov_len = sizeof(*rd); 239 vecs[1].iov_base = (unsigned char *)name; 240 vecs[1].iov_len = namelen; 241 242 fd = jffs2_alloc_full_dirent(namelen+1); 243 if (!fd) 244 return ERR_PTR(-ENOMEM); 245 246 fd->version = je32_to_cpu(rd->version); 247 fd->ino = je32_to_cpu(rd->ino); 248 fd->nhash = full_name_hash(NULL, name, namelen); 249 fd->type = rd->type; 250 memcpy(fd->name, name, namelen); 251 fd->name[namelen]=0; 252 253 retry: 254 flash_ofs = write_ofs(c); 255 256 jffs2_dbg_prewrite_paranoia_check(c, flash_ofs, vecs[0].iov_len + vecs[1].iov_len); 257 258 if ((alloc_mode!=ALLOC_GC) && (je32_to_cpu(rd->version) < f->highest_version)) { 259 BUG_ON(!retried); 260 jffs2_dbg(1, "%s(): dirent_version %d, highest version %d -> updating dirent\n", 261 __func__, 262 je32_to_cpu(rd->version), f->highest_version); 263 rd->version = cpu_to_je32(++f->highest_version); 264 fd->version = je32_to_cpu(rd->version); 265 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 266 } 267 268 ret = jffs2_flash_writev(c, vecs, 2, flash_ofs, &retlen, 269 (alloc_mode==ALLOC_GC)?0:je32_to_cpu(rd->pino)); 270 if (ret || (retlen != sizeof(*rd) + namelen)) { 271 pr_notice("Write of %zd bytes at 0x%08x failed. returned %d, retlen %zd\n", 272 sizeof(*rd) + namelen, flash_ofs, ret, retlen); 273 /* Mark the space as dirtied */ 274 if (retlen) { 275 jffs2_add_physical_node_ref(c, flash_ofs | REF_OBSOLETE, PAD(sizeof(*rd)+namelen), NULL); 276 } else { 277 pr_notice("Not marking the space at 0x%08x as dirty because the flash driver returned retlen zero\n", 278 flash_ofs); 279 } 280 if (!retried) { 281 /* Try to reallocate space and retry */ 282 uint32_t dummy; 283 struct jffs2_eraseblock *jeb = &c->blocks[flash_ofs / c->sector_size]; 284 285 retried = 1; 286 287 jffs2_dbg(1, "Retrying failed write.\n"); 288 289 jffs2_dbg_acct_sanity_check(c,jeb); 290 jffs2_dbg_acct_paranoia_check(c, jeb); 291 292 if (alloc_mode == ALLOC_GC) { 293 ret = jffs2_reserve_space_gc(c, sizeof(*rd) + namelen, &dummy, 294 JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 295 } else { 296 /* Locking pain */ 297 mutex_unlock(&f->sem); 298 jffs2_complete_reservation(c); 299 300 ret = jffs2_reserve_space(c, sizeof(*rd) + namelen, &dummy, 301 alloc_mode, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 302 mutex_lock(&f->sem); 303 } 304 305 if (!ret) { 306 flash_ofs = write_ofs(c); 307 jffs2_dbg(1, "Allocated space at 0x%08x to retry failed write\n", 308 flash_ofs); 309 jffs2_dbg_acct_sanity_check(c,jeb); 310 jffs2_dbg_acct_paranoia_check(c, jeb); 311 goto retry; 312 } 313 jffs2_dbg(1, "Failed to allocate space to retry failed write: %d!\n", 314 ret); 315 } 316 /* Release the full_dnode which is now useless, and return */ 317 jffs2_free_full_dirent(fd); 318 return ERR_PTR(ret?ret:-EIO); 319 } 320 /* Mark the space used */ 321 fd->raw = jffs2_add_physical_node_ref(c, flash_ofs | dirent_node_state(rd), 322 PAD(sizeof(*rd)+namelen), f->inocache); 323 if (IS_ERR(fd->raw)) { 324 void *hold_err = fd->raw; 325 /* Release the full_dirent which is now useless, and return */ 326 jffs2_free_full_dirent(fd); 327 return ERR_CAST(hold_err); 328 } 329 330 if (retried) { 331 jffs2_dbg_acct_sanity_check(c,NULL); 332 } 333 334 return fd; 335 } 336 337 /* The OS-specific code fills in the metadata in the jffs2_raw_inode for us, so that 338 we don't have to go digging in struct inode or its equivalent. It should set: 339 mode, uid, gid, (starting)isize, atime, ctime, mtime */ 340 int jffs2_write_inode_range(struct jffs2_sb_info *c, struct jffs2_inode_info *f, 341 struct jffs2_raw_inode *ri, unsigned char *buf, 342 uint32_t offset, uint32_t writelen, uint32_t *retlen) 343 { 344 int ret = 0; 345 uint32_t writtenlen = 0; 346 347 jffs2_dbg(1, "%s(): Ino #%u, ofs 0x%x, len 0x%x\n", 348 __func__, f->inocache->ino, offset, writelen); 349 350 while(writelen) { 351 struct jffs2_full_dnode *fn; 352 unsigned char *comprbuf = NULL; 353 uint16_t comprtype = JFFS2_COMPR_NONE; 354 uint32_t alloclen; 355 uint32_t datalen, cdatalen; 356 int retried = 0; 357 358 retry: 359 jffs2_dbg(2, "jffs2_commit_write() loop: 0x%x to write to 0x%x\n", 360 writelen, offset); 361 362 ret = jffs2_reserve_space(c, sizeof(*ri) + JFFS2_MIN_DATA_LEN, 363 &alloclen, ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); 364 if (ret) { 365 jffs2_dbg(1, "jffs2_reserve_space returned %d\n", ret); 366 break; 367 } 368 mutex_lock(&f->sem); 369 datalen = min_t(uint32_t, writelen, 370 PAGE_SIZE - (offset & (PAGE_SIZE-1))); 371 cdatalen = min_t(uint32_t, alloclen - sizeof(*ri), datalen); 372 373 comprtype = jffs2_compress(c, f, buf, &comprbuf, &datalen, &cdatalen); 374 375 ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 376 ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE); 377 ri->totlen = cpu_to_je32(sizeof(*ri) + cdatalen); 378 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 379 380 ri->ino = cpu_to_je32(f->inocache->ino); 381 ri->version = cpu_to_je32(++f->highest_version); 382 ri->isize = cpu_to_je32(max(je32_to_cpu(ri->isize), offset + datalen)); 383 ri->offset = cpu_to_je32(offset); 384 ri->csize = cpu_to_je32(cdatalen); 385 ri->dsize = cpu_to_je32(datalen); 386 ri->compr = comprtype & 0xff; 387 ri->usercompr = (comprtype >> 8 ) & 0xff; 388 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 389 ri->data_crc = cpu_to_je32(crc32(0, comprbuf, cdatalen)); 390 391 fn = jffs2_write_dnode(c, f, ri, comprbuf, cdatalen, ALLOC_NORETRY); 392 393 jffs2_free_comprbuf(comprbuf, buf); 394 395 if (IS_ERR(fn)) { 396 ret = PTR_ERR(fn); 397 mutex_unlock(&f->sem); 398 jffs2_complete_reservation(c); 399 if (!retried) { 400 /* Write error to be retried */ 401 retried = 1; 402 jffs2_dbg(1, "Retrying node write in jffs2_write_inode_range()\n"); 403 goto retry; 404 } 405 break; 406 } 407 ret = jffs2_add_full_dnode_to_inode(c, f, fn); 408 if (f->metadata) { 409 jffs2_mark_node_obsolete(c, f->metadata->raw); 410 jffs2_free_full_dnode(f->metadata); 411 f->metadata = NULL; 412 } 413 if (ret) { 414 /* Eep */ 415 jffs2_dbg(1, "Eep. add_full_dnode_to_inode() failed in commit_write, returned %d\n", 416 ret); 417 jffs2_mark_node_obsolete(c, fn->raw); 418 jffs2_free_full_dnode(fn); 419 420 mutex_unlock(&f->sem); 421 jffs2_complete_reservation(c); 422 break; 423 } 424 mutex_unlock(&f->sem); 425 jffs2_complete_reservation(c); 426 if (!datalen) { 427 pr_warn("Eep. We didn't actually write any data in jffs2_write_inode_range()\n"); 428 ret = -EIO; 429 break; 430 } 431 jffs2_dbg(1, "increasing writtenlen by %d\n", datalen); 432 writtenlen += datalen; 433 offset += datalen; 434 writelen -= datalen; 435 buf += datalen; 436 } 437 *retlen = writtenlen; 438 return ret; 439 } 440 441 int jffs2_do_create(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, 442 struct jffs2_inode_info *f, struct jffs2_raw_inode *ri, 443 const struct qstr *qstr) 444 { 445 struct jffs2_raw_dirent *rd; 446 struct jffs2_full_dnode *fn; 447 struct jffs2_full_dirent *fd; 448 uint32_t alloclen; 449 int ret; 450 451 /* Try to reserve enough space for both node and dirent. 452 * Just the node will do for now, though 453 */ 454 ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL, 455 JFFS2_SUMMARY_INODE_SIZE); 456 jffs2_dbg(1, "%s(): reserved 0x%x bytes\n", __func__, alloclen); 457 if (ret) 458 return ret; 459 460 mutex_lock(&f->sem); 461 462 ri->data_crc = cpu_to_je32(0); 463 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 464 465 fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL); 466 467 jffs2_dbg(1, "jffs2_do_create created file with mode 0x%x\n", 468 jemode_to_cpu(ri->mode)); 469 470 if (IS_ERR(fn)) { 471 jffs2_dbg(1, "jffs2_write_dnode() failed\n"); 472 /* Eeek. Wave bye bye */ 473 mutex_unlock(&f->sem); 474 jffs2_complete_reservation(c); 475 return PTR_ERR(fn); 476 } 477 /* No data here. Only a metadata node, which will be 478 obsoleted by the first data write 479 */ 480 f->metadata = fn; 481 482 mutex_unlock(&f->sem); 483 jffs2_complete_reservation(c); 484 485 ret = jffs2_init_security(&f->vfs_inode, &dir_f->vfs_inode, qstr); 486 if (ret) 487 return ret; 488 ret = jffs2_init_acl_post(&f->vfs_inode); 489 if (ret) 490 return ret; 491 492 ret = jffs2_reserve_space(c, sizeof(*rd)+qstr->len, &alloclen, 493 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(qstr->len)); 494 495 if (ret) { 496 /* Eep. */ 497 jffs2_dbg(1, "jffs2_reserve_space() for dirent failed\n"); 498 return ret; 499 } 500 501 rd = jffs2_alloc_raw_dirent(); 502 if (!rd) { 503 /* Argh. Now we treat it like a normal delete */ 504 jffs2_complete_reservation(c); 505 return -ENOMEM; 506 } 507 508 mutex_lock(&dir_f->sem); 509 510 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 511 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 512 rd->totlen = cpu_to_je32(sizeof(*rd) + qstr->len); 513 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 514 515 rd->pino = cpu_to_je32(dir_f->inocache->ino); 516 rd->version = cpu_to_je32(++dir_f->highest_version); 517 rd->ino = ri->ino; 518 rd->mctime = ri->ctime; 519 rd->nsize = qstr->len; 520 rd->type = DT_REG; 521 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 522 rd->name_crc = cpu_to_je32(crc32(0, qstr->name, qstr->len)); 523 524 fd = jffs2_write_dirent(c, dir_f, rd, qstr->name, qstr->len, ALLOC_NORMAL); 525 526 jffs2_free_raw_dirent(rd); 527 528 if (IS_ERR(fd)) { 529 /* dirent failed to write. Delete the inode normally 530 as if it were the final unlink() */ 531 jffs2_complete_reservation(c); 532 mutex_unlock(&dir_f->sem); 533 return PTR_ERR(fd); 534 } 535 536 /* Link the fd into the inode's list, obsoleting an old 537 one if necessary. */ 538 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 539 540 jffs2_complete_reservation(c); 541 mutex_unlock(&dir_f->sem); 542 543 return 0; 544 } 545 546 547 int jffs2_do_unlink(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, 548 const char *name, int namelen, struct jffs2_inode_info *dead_f, 549 uint32_t time) 550 { 551 struct jffs2_raw_dirent *rd; 552 struct jffs2_full_dirent *fd; 553 uint32_t alloclen; 554 int ret; 555 556 if (!jffs2_can_mark_obsolete(c)) { 557 /* We can't mark stuff obsolete on the medium. We need to write a deletion dirent */ 558 559 rd = jffs2_alloc_raw_dirent(); 560 if (!rd) 561 return -ENOMEM; 562 563 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 564 ALLOC_DELETION, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 565 if (ret) { 566 jffs2_free_raw_dirent(rd); 567 return ret; 568 } 569 570 mutex_lock(&dir_f->sem); 571 572 /* Build a deletion node */ 573 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 574 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 575 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 576 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 577 578 rd->pino = cpu_to_je32(dir_f->inocache->ino); 579 rd->version = cpu_to_je32(++dir_f->highest_version); 580 rd->ino = cpu_to_je32(0); 581 rd->mctime = cpu_to_je32(time); 582 rd->nsize = namelen; 583 rd->type = DT_UNKNOWN; 584 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 585 rd->name_crc = cpu_to_je32(crc32(0, name, namelen)); 586 587 fd = jffs2_write_dirent(c, dir_f, rd, name, namelen, ALLOC_DELETION); 588 589 jffs2_free_raw_dirent(rd); 590 591 if (IS_ERR(fd)) { 592 jffs2_complete_reservation(c); 593 mutex_unlock(&dir_f->sem); 594 return PTR_ERR(fd); 595 } 596 597 /* File it. This will mark the old one obsolete. */ 598 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 599 mutex_unlock(&dir_f->sem); 600 } else { 601 uint32_t nhash = full_name_hash(NULL, name, namelen); 602 603 fd = dir_f->dents; 604 /* We don't actually want to reserve any space, but we do 605 want to be holding the alloc_sem when we write to flash */ 606 mutex_lock(&c->alloc_sem); 607 mutex_lock(&dir_f->sem); 608 609 for (fd = dir_f->dents; fd; fd = fd->next) { 610 if (fd->nhash == nhash && 611 !memcmp(fd->name, name, namelen) && 612 !fd->name[namelen]) { 613 614 jffs2_dbg(1, "Marking old dirent node (ino #%u) @%08x obsolete\n", 615 fd->ino, ref_offset(fd->raw)); 616 jffs2_mark_node_obsolete(c, fd->raw); 617 /* We don't want to remove it from the list immediately, 618 because that screws up getdents()/seek() semantics even 619 more than they're screwed already. Turn it into a 620 node-less deletion dirent instead -- a placeholder */ 621 fd->raw = NULL; 622 fd->ino = 0; 623 break; 624 } 625 } 626 mutex_unlock(&dir_f->sem); 627 } 628 629 /* dead_f is NULL if this was a rename not a real unlink */ 630 /* Also catch the !f->inocache case, where there was a dirent 631 pointing to an inode which didn't exist. */ 632 if (dead_f && dead_f->inocache) { 633 634 mutex_lock(&dead_f->sem); 635 636 if (S_ISDIR(OFNI_EDONI_2SFFJ(dead_f)->i_mode)) { 637 while (dead_f->dents) { 638 /* There can be only deleted ones */ 639 fd = dead_f->dents; 640 641 dead_f->dents = fd->next; 642 643 if (fd->ino) { 644 pr_warn("Deleting inode #%u with active dentry \"%s\"->ino #%u\n", 645 dead_f->inocache->ino, 646 fd->name, fd->ino); 647 } else { 648 jffs2_dbg(1, "Removing deletion dirent for \"%s\" from dir ino #%u\n", 649 fd->name, 650 dead_f->inocache->ino); 651 } 652 if (fd->raw) 653 jffs2_mark_node_obsolete(c, fd->raw); 654 jffs2_free_full_dirent(fd); 655 } 656 dead_f->inocache->pino_nlink = 0; 657 } else 658 dead_f->inocache->pino_nlink--; 659 /* NB: Caller must set inode nlink if appropriate */ 660 mutex_unlock(&dead_f->sem); 661 } 662 663 jffs2_complete_reservation(c); 664 665 return 0; 666 } 667 668 669 int jffs2_do_link (struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, uint32_t ino, uint8_t type, const char *name, int namelen, uint32_t time) 670 { 671 struct jffs2_raw_dirent *rd; 672 struct jffs2_full_dirent *fd; 673 uint32_t alloclen; 674 int ret; 675 676 rd = jffs2_alloc_raw_dirent(); 677 if (!rd) 678 return -ENOMEM; 679 680 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 681 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 682 if (ret) { 683 jffs2_free_raw_dirent(rd); 684 return ret; 685 } 686 687 mutex_lock(&dir_f->sem); 688 689 /* Build a deletion node */ 690 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 691 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 692 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 693 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 694 695 rd->pino = cpu_to_je32(dir_f->inocache->ino); 696 rd->version = cpu_to_je32(++dir_f->highest_version); 697 rd->ino = cpu_to_je32(ino); 698 rd->mctime = cpu_to_je32(time); 699 rd->nsize = namelen; 700 701 rd->type = type; 702 703 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 704 rd->name_crc = cpu_to_je32(crc32(0, name, namelen)); 705 706 fd = jffs2_write_dirent(c, dir_f, rd, name, namelen, ALLOC_NORMAL); 707 708 jffs2_free_raw_dirent(rd); 709 710 if (IS_ERR(fd)) { 711 jffs2_complete_reservation(c); 712 mutex_unlock(&dir_f->sem); 713 return PTR_ERR(fd); 714 } 715 716 /* File it. This will mark the old one obsolete. */ 717 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 718 719 jffs2_complete_reservation(c); 720 mutex_unlock(&dir_f->sem); 721 722 return 0; 723 } 724