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 #include <linux/kernel.h> 13 #include <linux/sched.h> 14 #include <linux/fs.h> 15 #include <linux/mtd/mtd.h> 16 #include <linux/rbtree.h> 17 #include <linux/crc32.h> 18 #include <linux/slab.h> 19 #include <linux/pagemap.h> 20 #include "nodelist.h" 21 22 static void jffs2_obsolete_node_frag(struct jffs2_sb_info *c, 23 struct jffs2_node_frag *this); 24 25 void jffs2_add_fd_to_list(struct jffs2_sb_info *c, struct jffs2_full_dirent *new, struct jffs2_full_dirent **list) 26 { 27 struct jffs2_full_dirent **prev = list; 28 29 dbg_dentlist("add dirent \"%s\", ino #%u\n", new->name, new->ino); 30 31 while ((*prev) && (*prev)->nhash <= new->nhash) { 32 if ((*prev)->nhash == new->nhash && !strcmp((*prev)->name, new->name)) { 33 /* Duplicate. Free one */ 34 if (new->version < (*prev)->version) { 35 dbg_dentlist("Eep! Marking new dirent node is obsolete, old is \"%s\", ino #%u\n", 36 (*prev)->name, (*prev)->ino); 37 jffs2_mark_node_obsolete(c, new->raw); 38 jffs2_free_full_dirent(new); 39 } else { 40 dbg_dentlist("marking old dirent \"%s\", ino #%u bsolete\n", 41 (*prev)->name, (*prev)->ino); 42 new->next = (*prev)->next; 43 jffs2_mark_node_obsolete(c, ((*prev)->raw)); 44 jffs2_free_full_dirent(*prev); 45 *prev = new; 46 } 47 return; 48 } 49 prev = &((*prev)->next); 50 } 51 new->next = *prev; 52 *prev = new; 53 } 54 55 void jffs2_truncate_fragtree(struct jffs2_sb_info *c, struct rb_root *list, uint32_t size) 56 { 57 struct jffs2_node_frag *frag = jffs2_lookup_node_frag(list, size); 58 59 dbg_fragtree("truncating fragtree to 0x%08x bytes\n", size); 60 61 /* We know frag->ofs <= size. That's what lookup does for us */ 62 if (frag && frag->ofs != size) { 63 if (frag->ofs+frag->size > size) { 64 frag->size = size - frag->ofs; 65 } 66 frag = frag_next(frag); 67 } 68 while (frag && frag->ofs >= size) { 69 struct jffs2_node_frag *next = frag_next(frag); 70 71 frag_erase(frag, list); 72 jffs2_obsolete_node_frag(c, frag); 73 frag = next; 74 } 75 76 if (size == 0) 77 return; 78 79 /* 80 * If the last fragment starts at the RAM page boundary, it is 81 * REF_PRISTINE irrespective of its size. 82 */ 83 frag = frag_last(list); 84 if (frag->node && (frag->ofs & (PAGE_CACHE_SIZE - 1)) == 0) { 85 dbg_fragtree2("marking the last fragment 0x%08x-0x%08x REF_PRISTINE.\n", 86 frag->ofs, frag->ofs + frag->size); 87 frag->node->raw->flash_offset = ref_offset(frag->node->raw) | REF_PRISTINE; 88 } 89 } 90 91 static void jffs2_obsolete_node_frag(struct jffs2_sb_info *c, 92 struct jffs2_node_frag *this) 93 { 94 if (this->node) { 95 this->node->frags--; 96 if (!this->node->frags) { 97 /* The node has no valid frags left. It's totally obsoleted */ 98 dbg_fragtree2("marking old node @0x%08x (0x%04x-0x%04x) obsolete\n", 99 ref_offset(this->node->raw), this->node->ofs, this->node->ofs+this->node->size); 100 jffs2_mark_node_obsolete(c, this->node->raw); 101 jffs2_free_full_dnode(this->node); 102 } else { 103 dbg_fragtree2("marking old node @0x%08x (0x%04x-0x%04x) REF_NORMAL. frags is %d\n", 104 ref_offset(this->node->raw), this->node->ofs, this->node->ofs+this->node->size, this->node->frags); 105 mark_ref_normal(this->node->raw); 106 } 107 108 } 109 jffs2_free_node_frag(this); 110 } 111 112 static void jffs2_fragtree_insert(struct jffs2_node_frag *newfrag, struct jffs2_node_frag *base) 113 { 114 struct rb_node *parent = &base->rb; 115 struct rb_node **link = &parent; 116 117 dbg_fragtree2("insert frag (0x%04x-0x%04x)\n", newfrag->ofs, newfrag->ofs + newfrag->size); 118 119 while (*link) { 120 parent = *link; 121 base = rb_entry(parent, struct jffs2_node_frag, rb); 122 123 if (newfrag->ofs > base->ofs) 124 link = &base->rb.rb_right; 125 else if (newfrag->ofs < base->ofs) 126 link = &base->rb.rb_left; 127 else { 128 JFFS2_ERROR("duplicate frag at %08x (%p,%p)\n", newfrag->ofs, newfrag, base); 129 BUG(); 130 } 131 } 132 133 rb_link_node(&newfrag->rb, &base->rb, link); 134 } 135 136 /* 137 * Allocate and initializes a new fragment. 138 */ 139 static struct jffs2_node_frag * new_fragment(struct jffs2_full_dnode *fn, uint32_t ofs, uint32_t size) 140 { 141 struct jffs2_node_frag *newfrag; 142 143 newfrag = jffs2_alloc_node_frag(); 144 if (likely(newfrag)) { 145 newfrag->ofs = ofs; 146 newfrag->size = size; 147 newfrag->node = fn; 148 } else { 149 JFFS2_ERROR("cannot allocate a jffs2_node_frag object\n"); 150 } 151 152 return newfrag; 153 } 154 155 /* 156 * Called when there is no overlapping fragment exist. Inserts a hole before the new 157 * fragment and inserts the new fragment to the fragtree. 158 */ 159 static int no_overlapping_node(struct jffs2_sb_info *c, struct rb_root *root, 160 struct jffs2_node_frag *newfrag, 161 struct jffs2_node_frag *this, uint32_t lastend) 162 { 163 if (lastend < newfrag->node->ofs) { 164 /* put a hole in before the new fragment */ 165 struct jffs2_node_frag *holefrag; 166 167 holefrag= new_fragment(NULL, lastend, newfrag->node->ofs - lastend); 168 if (unlikely(!holefrag)) { 169 jffs2_free_node_frag(newfrag); 170 return -ENOMEM; 171 } 172 173 if (this) { 174 /* By definition, the 'this' node has no right-hand child, 175 because there are no frags with offset greater than it. 176 So that's where we want to put the hole */ 177 dbg_fragtree2("add hole frag %#04x-%#04x on the right of the new frag.\n", 178 holefrag->ofs, holefrag->ofs + holefrag->size); 179 rb_link_node(&holefrag->rb, &this->rb, &this->rb.rb_right); 180 } else { 181 dbg_fragtree2("Add hole frag %#04x-%#04x to the root of the tree.\n", 182 holefrag->ofs, holefrag->ofs + holefrag->size); 183 rb_link_node(&holefrag->rb, NULL, &root->rb_node); 184 } 185 rb_insert_color(&holefrag->rb, root); 186 this = holefrag; 187 } 188 189 if (this) { 190 /* By definition, the 'this' node has no right-hand child, 191 because there are no frags with offset greater than it. 192 So that's where we want to put new fragment */ 193 dbg_fragtree2("add the new node at the right\n"); 194 rb_link_node(&newfrag->rb, &this->rb, &this->rb.rb_right); 195 } else { 196 dbg_fragtree2("insert the new node at the root of the tree\n"); 197 rb_link_node(&newfrag->rb, NULL, &root->rb_node); 198 } 199 rb_insert_color(&newfrag->rb, root); 200 201 return 0; 202 } 203 204 /* Doesn't set inode->i_size */ 205 static int jffs2_add_frag_to_fragtree(struct jffs2_sb_info *c, struct rb_root *root, struct jffs2_node_frag *newfrag) 206 { 207 struct jffs2_node_frag *this; 208 uint32_t lastend; 209 210 /* Skip all the nodes which are completed before this one starts */ 211 this = jffs2_lookup_node_frag(root, newfrag->node->ofs); 212 213 if (this) { 214 dbg_fragtree2("lookup gave frag 0x%04x-0x%04x; phys 0x%08x (*%p)\n", 215 this->ofs, this->ofs+this->size, this->node?(ref_offset(this->node->raw)):0xffffffff, this); 216 lastend = this->ofs + this->size; 217 } else { 218 dbg_fragtree2("lookup gave no frag\n"); 219 lastend = 0; 220 } 221 222 /* See if we ran off the end of the fragtree */ 223 if (lastend <= newfrag->ofs) { 224 /* We did */ 225 226 /* Check if 'this' node was on the same page as the new node. 227 If so, both 'this' and the new node get marked REF_NORMAL so 228 the GC can take a look. 229 */ 230 if (lastend && (lastend-1) >> PAGE_CACHE_SHIFT == newfrag->ofs >> PAGE_CACHE_SHIFT) { 231 if (this->node) 232 mark_ref_normal(this->node->raw); 233 mark_ref_normal(newfrag->node->raw); 234 } 235 236 return no_overlapping_node(c, root, newfrag, this, lastend); 237 } 238 239 if (this->node) 240 dbg_fragtree2("dealing with frag %u-%u, phys %#08x(%d).\n", 241 this->ofs, this->ofs + this->size, 242 ref_offset(this->node->raw), ref_flags(this->node->raw)); 243 else 244 dbg_fragtree2("dealing with hole frag %u-%u.\n", 245 this->ofs, this->ofs + this->size); 246 247 /* OK. 'this' is pointing at the first frag that newfrag->ofs at least partially obsoletes, 248 * - i.e. newfrag->ofs < this->ofs+this->size && newfrag->ofs >= this->ofs 249 */ 250 if (newfrag->ofs > this->ofs) { 251 /* This node isn't completely obsoleted. The start of it remains valid */ 252 253 /* Mark the new node and the partially covered node REF_NORMAL -- let 254 the GC take a look at them */ 255 mark_ref_normal(newfrag->node->raw); 256 if (this->node) 257 mark_ref_normal(this->node->raw); 258 259 if (this->ofs + this->size > newfrag->ofs + newfrag->size) { 260 /* The new node splits 'this' frag into two */ 261 struct jffs2_node_frag *newfrag2; 262 263 if (this->node) 264 dbg_fragtree2("split old frag 0x%04x-0x%04x, phys 0x%08x\n", 265 this->ofs, this->ofs+this->size, ref_offset(this->node->raw)); 266 else 267 dbg_fragtree2("split old hole frag 0x%04x-0x%04x\n", 268 this->ofs, this->ofs+this->size); 269 270 /* New second frag pointing to this's node */ 271 newfrag2 = new_fragment(this->node, newfrag->ofs + newfrag->size, 272 this->ofs + this->size - newfrag->ofs - newfrag->size); 273 if (unlikely(!newfrag2)) 274 return -ENOMEM; 275 if (this->node) 276 this->node->frags++; 277 278 /* Adjust size of original 'this' */ 279 this->size = newfrag->ofs - this->ofs; 280 281 /* Now, we know there's no node with offset 282 greater than this->ofs but smaller than 283 newfrag2->ofs or newfrag->ofs, for obvious 284 reasons. So we can do a tree insert from 285 'this' to insert newfrag, and a tree insert 286 from newfrag to insert newfrag2. */ 287 jffs2_fragtree_insert(newfrag, this); 288 rb_insert_color(&newfrag->rb, root); 289 290 jffs2_fragtree_insert(newfrag2, newfrag); 291 rb_insert_color(&newfrag2->rb, root); 292 293 return 0; 294 } 295 /* New node just reduces 'this' frag in size, doesn't split it */ 296 this->size = newfrag->ofs - this->ofs; 297 298 /* Again, we know it lives down here in the tree */ 299 jffs2_fragtree_insert(newfrag, this); 300 rb_insert_color(&newfrag->rb, root); 301 } else { 302 /* New frag starts at the same point as 'this' used to. Replace 303 it in the tree without doing a delete and insertion */ 304 dbg_fragtree2("inserting newfrag (*%p),%d-%d in before 'this' (*%p),%d-%d\n", 305 newfrag, newfrag->ofs, newfrag->ofs+newfrag->size, this, this->ofs, this->ofs+this->size); 306 307 rb_replace_node(&this->rb, &newfrag->rb, root); 308 309 if (newfrag->ofs + newfrag->size >= this->ofs+this->size) { 310 dbg_fragtree2("obsoleting node frag %p (%x-%x)\n", this, this->ofs, this->ofs+this->size); 311 jffs2_obsolete_node_frag(c, this); 312 } else { 313 this->ofs += newfrag->size; 314 this->size -= newfrag->size; 315 316 jffs2_fragtree_insert(this, newfrag); 317 rb_insert_color(&this->rb, root); 318 return 0; 319 } 320 } 321 /* OK, now we have newfrag added in the correct place in the tree, but 322 frag_next(newfrag) may be a fragment which is overlapped by it 323 */ 324 while ((this = frag_next(newfrag)) && newfrag->ofs + newfrag->size >= this->ofs + this->size) { 325 /* 'this' frag is obsoleted completely. */ 326 dbg_fragtree2("obsoleting node frag %p (%x-%x) and removing from tree\n", 327 this, this->ofs, this->ofs+this->size); 328 rb_erase(&this->rb, root); 329 jffs2_obsolete_node_frag(c, this); 330 } 331 /* Now we're pointing at the first frag which isn't totally obsoleted by 332 the new frag */ 333 334 if (!this || newfrag->ofs + newfrag->size == this->ofs) 335 return 0; 336 337 /* Still some overlap but we don't need to move it in the tree */ 338 this->size = (this->ofs + this->size) - (newfrag->ofs + newfrag->size); 339 this->ofs = newfrag->ofs + newfrag->size; 340 341 /* And mark them REF_NORMAL so the GC takes a look at them */ 342 if (this->node) 343 mark_ref_normal(this->node->raw); 344 mark_ref_normal(newfrag->node->raw); 345 346 return 0; 347 } 348 349 /* 350 * Given an inode, probably with existing tree of fragments, add the new node 351 * to the fragment tree. 352 */ 353 int jffs2_add_full_dnode_to_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, struct jffs2_full_dnode *fn) 354 { 355 int ret; 356 struct jffs2_node_frag *newfrag; 357 358 if (unlikely(!fn->size)) 359 return 0; 360 361 newfrag = new_fragment(fn, fn->ofs, fn->size); 362 if (unlikely(!newfrag)) 363 return -ENOMEM; 364 newfrag->node->frags = 1; 365 366 dbg_fragtree("adding node %#04x-%#04x @0x%08x on flash, newfrag *%p\n", 367 fn->ofs, fn->ofs+fn->size, ref_offset(fn->raw), newfrag); 368 369 ret = jffs2_add_frag_to_fragtree(c, &f->fragtree, newfrag); 370 if (unlikely(ret)) 371 return ret; 372 373 /* If we now share a page with other nodes, mark either previous 374 or next node REF_NORMAL, as appropriate. */ 375 if (newfrag->ofs & (PAGE_CACHE_SIZE-1)) { 376 struct jffs2_node_frag *prev = frag_prev(newfrag); 377 378 mark_ref_normal(fn->raw); 379 /* If we don't start at zero there's _always_ a previous */ 380 if (prev->node) 381 mark_ref_normal(prev->node->raw); 382 } 383 384 if ((newfrag->ofs+newfrag->size) & (PAGE_CACHE_SIZE-1)) { 385 struct jffs2_node_frag *next = frag_next(newfrag); 386 387 if (next) { 388 mark_ref_normal(fn->raw); 389 if (next->node) 390 mark_ref_normal(next->node->raw); 391 } 392 } 393 jffs2_dbg_fragtree_paranoia_check_nolock(f); 394 395 return 0; 396 } 397 398 void jffs2_set_inocache_state(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic, int state) 399 { 400 spin_lock(&c->inocache_lock); 401 ic->state = state; 402 wake_up(&c->inocache_wq); 403 spin_unlock(&c->inocache_lock); 404 } 405 406 /* During mount, this needs no locking. During normal operation, its 407 callers want to do other stuff while still holding the inocache_lock. 408 Rather than introducing special case get_ino_cache functions or 409 callbacks, we just let the caller do the locking itself. */ 410 411 struct jffs2_inode_cache *jffs2_get_ino_cache(struct jffs2_sb_info *c, uint32_t ino) 412 { 413 struct jffs2_inode_cache *ret; 414 415 ret = c->inocache_list[ino % INOCACHE_HASHSIZE]; 416 while (ret && ret->ino < ino) { 417 ret = ret->next; 418 } 419 420 if (ret && ret->ino != ino) 421 ret = NULL; 422 423 return ret; 424 } 425 426 void jffs2_add_ino_cache (struct jffs2_sb_info *c, struct jffs2_inode_cache *new) 427 { 428 struct jffs2_inode_cache **prev; 429 430 spin_lock(&c->inocache_lock); 431 if (!new->ino) 432 new->ino = ++c->highest_ino; 433 434 dbg_inocache("add %p (ino #%u)\n", new, new->ino); 435 436 prev = &c->inocache_list[new->ino % INOCACHE_HASHSIZE]; 437 438 while ((*prev) && (*prev)->ino < new->ino) { 439 prev = &(*prev)->next; 440 } 441 new->next = *prev; 442 *prev = new; 443 444 spin_unlock(&c->inocache_lock); 445 } 446 447 void jffs2_del_ino_cache(struct jffs2_sb_info *c, struct jffs2_inode_cache *old) 448 { 449 struct jffs2_inode_cache **prev; 450 451 #ifdef CONFIG_JFFS2_FS_XATTR 452 BUG_ON(old->xref); 453 #endif 454 dbg_inocache("del %p (ino #%u)\n", old, old->ino); 455 spin_lock(&c->inocache_lock); 456 457 prev = &c->inocache_list[old->ino % INOCACHE_HASHSIZE]; 458 459 while ((*prev) && (*prev)->ino < old->ino) { 460 prev = &(*prev)->next; 461 } 462 if ((*prev) == old) { 463 *prev = old->next; 464 } 465 466 /* Free it now unless it's in READING or CLEARING state, which 467 are the transitions upon read_inode() and clear_inode(). The 468 rest of the time we know nobody else is looking at it, and 469 if it's held by read_inode() or clear_inode() they'll free it 470 for themselves. */ 471 if (old->state != INO_STATE_READING && old->state != INO_STATE_CLEARING) 472 jffs2_free_inode_cache(old); 473 474 spin_unlock(&c->inocache_lock); 475 } 476 477 void jffs2_free_ino_caches(struct jffs2_sb_info *c) 478 { 479 int i; 480 struct jffs2_inode_cache *this, *next; 481 482 for (i=0; i<INOCACHE_HASHSIZE; i++) { 483 this = c->inocache_list[i]; 484 while (this) { 485 next = this->next; 486 jffs2_xattr_free_inode(c, this); 487 jffs2_free_inode_cache(this); 488 this = next; 489 } 490 c->inocache_list[i] = NULL; 491 } 492 } 493 494 void jffs2_free_raw_node_refs(struct jffs2_sb_info *c) 495 { 496 int i; 497 struct jffs2_raw_node_ref *this, *next; 498 499 for (i=0; i<c->nr_blocks; i++) { 500 this = c->blocks[i].first_node; 501 while (this) { 502 if (this[REFS_PER_BLOCK].flash_offset == REF_LINK_NODE) 503 next = this[REFS_PER_BLOCK].next_in_ino; 504 else 505 next = NULL; 506 507 jffs2_free_refblock(this); 508 this = next; 509 } 510 c->blocks[i].first_node = c->blocks[i].last_node = NULL; 511 } 512 } 513 514 struct jffs2_node_frag *jffs2_lookup_node_frag(struct rb_root *fragtree, uint32_t offset) 515 { 516 /* The common case in lookup is that there will be a node 517 which precisely matches. So we go looking for that first */ 518 struct rb_node *next; 519 struct jffs2_node_frag *prev = NULL; 520 struct jffs2_node_frag *frag = NULL; 521 522 dbg_fragtree2("root %p, offset %d\n", fragtree, offset); 523 524 next = fragtree->rb_node; 525 526 while(next) { 527 frag = rb_entry(next, struct jffs2_node_frag, rb); 528 529 if (frag->ofs + frag->size <= offset) { 530 /* Remember the closest smaller match on the way down */ 531 if (!prev || frag->ofs > prev->ofs) 532 prev = frag; 533 next = frag->rb.rb_right; 534 } else if (frag->ofs > offset) { 535 next = frag->rb.rb_left; 536 } else { 537 return frag; 538 } 539 } 540 541 /* Exact match not found. Go back up looking at each parent, 542 and return the closest smaller one */ 543 544 if (prev) 545 dbg_fragtree2("no match. Returning frag %#04x-%#04x, closest previous\n", 546 prev->ofs, prev->ofs+prev->size); 547 else 548 dbg_fragtree2("returning NULL, empty fragtree\n"); 549 550 return prev; 551 } 552 553 /* Pass 'c' argument to indicate that nodes should be marked obsolete as 554 they're killed. */ 555 void jffs2_kill_fragtree(struct rb_root *root, struct jffs2_sb_info *c) 556 { 557 struct jffs2_node_frag *frag; 558 struct jffs2_node_frag *parent; 559 560 if (!root->rb_node) 561 return; 562 563 dbg_fragtree("killing\n"); 564 565 frag = (rb_entry(root->rb_node, struct jffs2_node_frag, rb)); 566 while(frag) { 567 if (frag->rb.rb_left) { 568 frag = frag_left(frag); 569 continue; 570 } 571 if (frag->rb.rb_right) { 572 frag = frag_right(frag); 573 continue; 574 } 575 576 if (frag->node && !(--frag->node->frags)) { 577 /* Not a hole, and it's the final remaining frag 578 of this node. Free the node */ 579 if (c) 580 jffs2_mark_node_obsolete(c, frag->node->raw); 581 582 jffs2_free_full_dnode(frag->node); 583 } 584 parent = frag_parent(frag); 585 if (parent) { 586 if (frag_left(parent) == frag) 587 parent->rb.rb_left = NULL; 588 else 589 parent->rb.rb_right = NULL; 590 } 591 592 jffs2_free_node_frag(frag); 593 frag = parent; 594 595 cond_resched(); 596 } 597 } 598 599 struct jffs2_raw_node_ref *jffs2_link_node_ref(struct jffs2_sb_info *c, 600 struct jffs2_eraseblock *jeb, 601 uint32_t ofs, uint32_t len, 602 struct jffs2_inode_cache *ic) 603 { 604 struct jffs2_raw_node_ref *ref; 605 606 BUG_ON(!jeb->allocated_refs); 607 jeb->allocated_refs--; 608 609 ref = jeb->last_node; 610 611 dbg_noderef("Last node at %p is (%08x,%p)\n", ref, ref->flash_offset, 612 ref->next_in_ino); 613 614 while (ref->flash_offset != REF_EMPTY_NODE) { 615 if (ref->flash_offset == REF_LINK_NODE) 616 ref = ref->next_in_ino; 617 else 618 ref++; 619 } 620 621 dbg_noderef("New ref is %p (%08x becomes %08x,%p) len 0x%x\n", ref, 622 ref->flash_offset, ofs, ref->next_in_ino, len); 623 624 ref->flash_offset = ofs; 625 626 if (!jeb->first_node) { 627 jeb->first_node = ref; 628 BUG_ON(ref_offset(ref) != jeb->offset); 629 } else if (unlikely(ref_offset(ref) != jeb->offset + c->sector_size - jeb->free_size)) { 630 uint32_t last_len = ref_totlen(c, jeb, jeb->last_node); 631 632 JFFS2_ERROR("Adding new ref %p at (0x%08x-0x%08x) not immediately after previous (0x%08x-0x%08x)\n", 633 ref, ref_offset(ref), ref_offset(ref)+len, 634 ref_offset(jeb->last_node), 635 ref_offset(jeb->last_node)+last_len); 636 BUG(); 637 } 638 jeb->last_node = ref; 639 640 if (ic) { 641 ref->next_in_ino = ic->nodes; 642 ic->nodes = ref; 643 } else { 644 ref->next_in_ino = NULL; 645 } 646 647 switch(ref_flags(ref)) { 648 case REF_UNCHECKED: 649 c->unchecked_size += len; 650 jeb->unchecked_size += len; 651 break; 652 653 case REF_NORMAL: 654 case REF_PRISTINE: 655 c->used_size += len; 656 jeb->used_size += len; 657 break; 658 659 case REF_OBSOLETE: 660 c->dirty_size += len; 661 jeb->dirty_size += len; 662 break; 663 } 664 c->free_size -= len; 665 jeb->free_size -= len; 666 667 #ifdef TEST_TOTLEN 668 /* Set (and test) __totlen field... for now */ 669 ref->__totlen = len; 670 ref_totlen(c, jeb, ref); 671 #endif 672 return ref; 673 } 674 675 /* No locking, no reservation of 'ref'. Do not use on a live file system */ 676 int jffs2_scan_dirty_space(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 677 uint32_t size) 678 { 679 if (!size) 680 return 0; 681 if (unlikely(size > jeb->free_size)) { 682 printk(KERN_CRIT "Dirty space 0x%x larger then free_size 0x%x (wasted 0x%x)\n", 683 size, jeb->free_size, jeb->wasted_size); 684 BUG(); 685 } 686 /* REF_EMPTY_NODE is !obsolete, so that works OK */ 687 if (jeb->last_node && ref_obsolete(jeb->last_node)) { 688 #ifdef TEST_TOTLEN 689 jeb->last_node->__totlen += size; 690 #endif 691 c->dirty_size += size; 692 c->free_size -= size; 693 jeb->dirty_size += size; 694 jeb->free_size -= size; 695 } else { 696 uint32_t ofs = jeb->offset + c->sector_size - jeb->free_size; 697 ofs |= REF_OBSOLETE; 698 699 jffs2_link_node_ref(c, jeb, ofs, size, NULL); 700 } 701 702 return 0; 703 } 704 705 /* Calculate totlen from surrounding nodes or eraseblock */ 706 static inline uint32_t __ref_totlen(struct jffs2_sb_info *c, 707 struct jffs2_eraseblock *jeb, 708 struct jffs2_raw_node_ref *ref) 709 { 710 uint32_t ref_end; 711 struct jffs2_raw_node_ref *next_ref = ref_next(ref); 712 713 if (next_ref) 714 ref_end = ref_offset(next_ref); 715 else { 716 if (!jeb) 717 jeb = &c->blocks[ref->flash_offset / c->sector_size]; 718 719 /* Last node in block. Use free_space */ 720 if (unlikely(ref != jeb->last_node)) { 721 printk(KERN_CRIT "ref %p @0x%08x is not jeb->last_node (%p @0x%08x)\n", 722 ref, ref_offset(ref), jeb->last_node, jeb->last_node?ref_offset(jeb->last_node):0); 723 BUG(); 724 } 725 ref_end = jeb->offset + c->sector_size - jeb->free_size; 726 } 727 return ref_end - ref_offset(ref); 728 } 729 730 uint32_t __jffs2_ref_totlen(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 731 struct jffs2_raw_node_ref *ref) 732 { 733 uint32_t ret; 734 735 ret = __ref_totlen(c, jeb, ref); 736 737 #ifdef TEST_TOTLEN 738 if (unlikely(ret != ref->__totlen)) { 739 if (!jeb) 740 jeb = &c->blocks[ref->flash_offset / c->sector_size]; 741 742 printk(KERN_CRIT "Totlen for ref at %p (0x%08x-0x%08x) miscalculated as 0x%x instead of %x\n", 743 ref, ref_offset(ref), ref_offset(ref)+ref->__totlen, 744 ret, ref->__totlen); 745 if (ref_next(ref)) { 746 printk(KERN_CRIT "next %p (0x%08x-0x%08x)\n", ref_next(ref), ref_offset(ref_next(ref)), 747 ref_offset(ref_next(ref))+ref->__totlen); 748 } else 749 printk(KERN_CRIT "No next ref. jeb->last_node is %p\n", jeb->last_node); 750 751 printk(KERN_CRIT "jeb->wasted_size %x, dirty_size %x, used_size %x, free_size %x\n", jeb->wasted_size, jeb->dirty_size, jeb->used_size, jeb->free_size); 752 753 #if defined(JFFS2_DBG_DUMPS) || defined(JFFS2_DBG_PARANOIA_CHECKS) 754 __jffs2_dbg_dump_node_refs_nolock(c, jeb); 755 #endif 756 757 WARN_ON(1); 758 759 ret = ref->__totlen; 760 } 761 #endif /* TEST_TOTLEN */ 762 return ret; 763 } 764