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_CACHE_SIZE) || 176 ( ((je32_to_cpu(ri->offset)&(PAGE_CACHE_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(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, PAGE_CACHE_SIZE - (offset & (PAGE_CACHE_SIZE-1))); 370 cdatalen = min_t(uint32_t, alloclen - sizeof(*ri), datalen); 371 372 comprtype = jffs2_compress(c, f, buf, &comprbuf, &datalen, &cdatalen); 373 374 ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 375 ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE); 376 ri->totlen = cpu_to_je32(sizeof(*ri) + cdatalen); 377 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 378 379 ri->ino = cpu_to_je32(f->inocache->ino); 380 ri->version = cpu_to_je32(++f->highest_version); 381 ri->isize = cpu_to_je32(max(je32_to_cpu(ri->isize), offset + datalen)); 382 ri->offset = cpu_to_je32(offset); 383 ri->csize = cpu_to_je32(cdatalen); 384 ri->dsize = cpu_to_je32(datalen); 385 ri->compr = comprtype & 0xff; 386 ri->usercompr = (comprtype >> 8 ) & 0xff; 387 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 388 ri->data_crc = cpu_to_je32(crc32(0, comprbuf, cdatalen)); 389 390 fn = jffs2_write_dnode(c, f, ri, comprbuf, cdatalen, ALLOC_NORETRY); 391 392 jffs2_free_comprbuf(comprbuf, buf); 393 394 if (IS_ERR(fn)) { 395 ret = PTR_ERR(fn); 396 mutex_unlock(&f->sem); 397 jffs2_complete_reservation(c); 398 if (!retried) { 399 /* Write error to be retried */ 400 retried = 1; 401 jffs2_dbg(1, "Retrying node write in jffs2_write_inode_range()\n"); 402 goto retry; 403 } 404 break; 405 } 406 ret = jffs2_add_full_dnode_to_inode(c, f, fn); 407 if (f->metadata) { 408 jffs2_mark_node_obsolete(c, f->metadata->raw); 409 jffs2_free_full_dnode(f->metadata); 410 f->metadata = NULL; 411 } 412 if (ret) { 413 /* Eep */ 414 jffs2_dbg(1, "Eep. add_full_dnode_to_inode() failed in commit_write, returned %d\n", 415 ret); 416 jffs2_mark_node_obsolete(c, fn->raw); 417 jffs2_free_full_dnode(fn); 418 419 mutex_unlock(&f->sem); 420 jffs2_complete_reservation(c); 421 break; 422 } 423 mutex_unlock(&f->sem); 424 jffs2_complete_reservation(c); 425 if (!datalen) { 426 pr_warn("Eep. We didn't actually write any data in jffs2_write_inode_range()\n"); 427 ret = -EIO; 428 break; 429 } 430 jffs2_dbg(1, "increasing writtenlen by %d\n", datalen); 431 writtenlen += datalen; 432 offset += datalen; 433 writelen -= datalen; 434 buf += datalen; 435 } 436 *retlen = writtenlen; 437 return ret; 438 } 439 440 int jffs2_do_create(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, 441 struct jffs2_inode_info *f, struct jffs2_raw_inode *ri, 442 const struct qstr *qstr) 443 { 444 struct jffs2_raw_dirent *rd; 445 struct jffs2_full_dnode *fn; 446 struct jffs2_full_dirent *fd; 447 uint32_t alloclen; 448 int ret; 449 450 /* Try to reserve enough space for both node and dirent. 451 * Just the node will do for now, though 452 */ 453 ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL, 454 JFFS2_SUMMARY_INODE_SIZE); 455 jffs2_dbg(1, "%s(): reserved 0x%x bytes\n", __func__, alloclen); 456 if (ret) 457 return ret; 458 459 mutex_lock(&f->sem); 460 461 ri->data_crc = cpu_to_je32(0); 462 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 463 464 fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL); 465 466 jffs2_dbg(1, "jffs2_do_create created file with mode 0x%x\n", 467 jemode_to_cpu(ri->mode)); 468 469 if (IS_ERR(fn)) { 470 jffs2_dbg(1, "jffs2_write_dnode() failed\n"); 471 /* Eeek. Wave bye bye */ 472 mutex_unlock(&f->sem); 473 jffs2_complete_reservation(c); 474 return PTR_ERR(fn); 475 } 476 /* No data here. Only a metadata node, which will be 477 obsoleted by the first data write 478 */ 479 f->metadata = fn; 480 481 mutex_unlock(&f->sem); 482 jffs2_complete_reservation(c); 483 484 ret = jffs2_init_security(&f->vfs_inode, &dir_f->vfs_inode, qstr); 485 if (ret) 486 return ret; 487 ret = jffs2_init_acl_post(&f->vfs_inode); 488 if (ret) 489 return ret; 490 491 ret = jffs2_reserve_space(c, sizeof(*rd)+qstr->len, &alloclen, 492 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(qstr->len)); 493 494 if (ret) { 495 /* Eep. */ 496 jffs2_dbg(1, "jffs2_reserve_space() for dirent failed\n"); 497 return ret; 498 } 499 500 rd = jffs2_alloc_raw_dirent(); 501 if (!rd) { 502 /* Argh. Now we treat it like a normal delete */ 503 jffs2_complete_reservation(c); 504 return -ENOMEM; 505 } 506 507 mutex_lock(&dir_f->sem); 508 509 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 510 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 511 rd->totlen = cpu_to_je32(sizeof(*rd) + qstr->len); 512 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 513 514 rd->pino = cpu_to_je32(dir_f->inocache->ino); 515 rd->version = cpu_to_je32(++dir_f->highest_version); 516 rd->ino = ri->ino; 517 rd->mctime = ri->ctime; 518 rd->nsize = qstr->len; 519 rd->type = DT_REG; 520 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 521 rd->name_crc = cpu_to_je32(crc32(0, qstr->name, qstr->len)); 522 523 fd = jffs2_write_dirent(c, dir_f, rd, qstr->name, qstr->len, ALLOC_NORMAL); 524 525 jffs2_free_raw_dirent(rd); 526 527 if (IS_ERR(fd)) { 528 /* dirent failed to write. Delete the inode normally 529 as if it were the final unlink() */ 530 jffs2_complete_reservation(c); 531 mutex_unlock(&dir_f->sem); 532 return PTR_ERR(fd); 533 } 534 535 /* Link the fd into the inode's list, obsoleting an old 536 one if necessary. */ 537 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 538 539 jffs2_complete_reservation(c); 540 mutex_unlock(&dir_f->sem); 541 542 return 0; 543 } 544 545 546 int jffs2_do_unlink(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, 547 const char *name, int namelen, struct jffs2_inode_info *dead_f, 548 uint32_t time) 549 { 550 struct jffs2_raw_dirent *rd; 551 struct jffs2_full_dirent *fd; 552 uint32_t alloclen; 553 int ret; 554 555 if (!jffs2_can_mark_obsolete(c)) { 556 /* We can't mark stuff obsolete on the medium. We need to write a deletion dirent */ 557 558 rd = jffs2_alloc_raw_dirent(); 559 if (!rd) 560 return -ENOMEM; 561 562 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 563 ALLOC_DELETION, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 564 if (ret) { 565 jffs2_free_raw_dirent(rd); 566 return ret; 567 } 568 569 mutex_lock(&dir_f->sem); 570 571 /* Build a deletion node */ 572 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 573 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 574 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 575 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 576 577 rd->pino = cpu_to_je32(dir_f->inocache->ino); 578 rd->version = cpu_to_je32(++dir_f->highest_version); 579 rd->ino = cpu_to_je32(0); 580 rd->mctime = cpu_to_je32(time); 581 rd->nsize = namelen; 582 rd->type = DT_UNKNOWN; 583 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 584 rd->name_crc = cpu_to_je32(crc32(0, name, namelen)); 585 586 fd = jffs2_write_dirent(c, dir_f, rd, name, namelen, ALLOC_DELETION); 587 588 jffs2_free_raw_dirent(rd); 589 590 if (IS_ERR(fd)) { 591 jffs2_complete_reservation(c); 592 mutex_unlock(&dir_f->sem); 593 return PTR_ERR(fd); 594 } 595 596 /* File it. This will mark the old one obsolete. */ 597 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 598 mutex_unlock(&dir_f->sem); 599 } else { 600 uint32_t nhash = full_name_hash(name, namelen); 601 602 fd = dir_f->dents; 603 /* We don't actually want to reserve any space, but we do 604 want to be holding the alloc_sem when we write to flash */ 605 mutex_lock(&c->alloc_sem); 606 mutex_lock(&dir_f->sem); 607 608 for (fd = dir_f->dents; fd; fd = fd->next) { 609 if (fd->nhash == nhash && 610 !memcmp(fd->name, name, namelen) && 611 !fd->name[namelen]) { 612 613 jffs2_dbg(1, "Marking old dirent node (ino #%u) @%08x obsolete\n", 614 fd->ino, ref_offset(fd->raw)); 615 jffs2_mark_node_obsolete(c, fd->raw); 616 /* We don't want to remove it from the list immediately, 617 because that screws up getdents()/seek() semantics even 618 more than they're screwed already. Turn it into a 619 node-less deletion dirent instead -- a placeholder */ 620 fd->raw = NULL; 621 fd->ino = 0; 622 break; 623 } 624 } 625 mutex_unlock(&dir_f->sem); 626 } 627 628 /* dead_f is NULL if this was a rename not a real unlink */ 629 /* Also catch the !f->inocache case, where there was a dirent 630 pointing to an inode which didn't exist. */ 631 if (dead_f && dead_f->inocache) { 632 633 mutex_lock(&dead_f->sem); 634 635 if (S_ISDIR(OFNI_EDONI_2SFFJ(dead_f)->i_mode)) { 636 while (dead_f->dents) { 637 /* There can be only deleted ones */ 638 fd = dead_f->dents; 639 640 dead_f->dents = fd->next; 641 642 if (fd->ino) { 643 pr_warn("Deleting inode #%u with active dentry \"%s\"->ino #%u\n", 644 dead_f->inocache->ino, 645 fd->name, fd->ino); 646 } else { 647 jffs2_dbg(1, "Removing deletion dirent for \"%s\" from dir ino #%u\n", 648 fd->name, 649 dead_f->inocache->ino); 650 } 651 if (fd->raw) 652 jffs2_mark_node_obsolete(c, fd->raw); 653 jffs2_free_full_dirent(fd); 654 } 655 dead_f->inocache->pino_nlink = 0; 656 } else 657 dead_f->inocache->pino_nlink--; 658 /* NB: Caller must set inode nlink if appropriate */ 659 mutex_unlock(&dead_f->sem); 660 } 661 662 jffs2_complete_reservation(c); 663 664 return 0; 665 } 666 667 668 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) 669 { 670 struct jffs2_raw_dirent *rd; 671 struct jffs2_full_dirent *fd; 672 uint32_t alloclen; 673 int ret; 674 675 rd = jffs2_alloc_raw_dirent(); 676 if (!rd) 677 return -ENOMEM; 678 679 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 680 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 681 if (ret) { 682 jffs2_free_raw_dirent(rd); 683 return ret; 684 } 685 686 mutex_lock(&dir_f->sem); 687 688 /* Build a deletion node */ 689 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 690 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 691 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 692 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 693 694 rd->pino = cpu_to_je32(dir_f->inocache->ino); 695 rd->version = cpu_to_je32(++dir_f->highest_version); 696 rd->ino = cpu_to_je32(ino); 697 rd->mctime = cpu_to_je32(time); 698 rd->nsize = namelen; 699 700 rd->type = type; 701 702 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 703 rd->name_crc = cpu_to_je32(crc32(0, name, namelen)); 704 705 fd = jffs2_write_dirent(c, dir_f, rd, name, namelen, ALLOC_NORMAL); 706 707 jffs2_free_raw_dirent(rd); 708 709 if (IS_ERR(fd)) { 710 jffs2_complete_reservation(c); 711 mutex_unlock(&dir_f->sem); 712 return PTR_ERR(fd); 713 } 714 715 /* File it. This will mark the old one obsolete. */ 716 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 717 718 jffs2_complete_reservation(c); 719 mutex_unlock(&dir_f->sem); 720 721 return 0; 722 } 723