fs/jffs2/nodelist.c

   1 /*
   2  * JFFS2 -- Journalling Flash File System, Version 2.
   3  *
   4  * Copyright (C) 2001-2003 Red Hat, Inc.
   5  *
   6  * Created by David Woodhouse <dwmw2@redhat.com>
   7  *
   8  * For licensing information, see the file 'LICENCE' in this directory.
   9  *
  10  * $Id: nodelist.c,v 1.80 2003/10/04 08:33:06 dwmw2 Exp $
  11  *
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/sched.h>
  16 #include <linux/fs.h>
  17 #include <linux/mtd/mtd.h>
  18 #include <linux/rbtree.h>
  19 #include <linux/crc32.h>
  20 #include <linux/slab.h>
  21 #include <linux/pagemap.h>
  22 #include "nodelist.h"
  23
  24 void jffs2_add_fd_to_list(struct jffs2_sb_info *c, struct jffs2_full_dirent *new, struct jffs2_full_dirent **list)
  25 {
  26         struct jffs2_full_dirent **prev = list;
  27         D1(printk(KERN_DEBUG "jffs2_add_fd_to_list( %p, %p (->%p))\n", new, list, *list));
  28
  29         while ((*prev) && (*prev)->nhash <= new->nhash) {
  30                 if ((*prev)->nhash == new->nhash && !strcmp((*prev)->name, new->name)) {
  31                         /* Duplicate. Free one */
  32                         if (new->version < (*prev)->version) {
  33                                 D1(printk(KERN_DEBUG "Eep! Marking new dirent node obsolete\n"));
  34                                 D1(printk(KERN_DEBUG "New dirent is \"%s\"->ino #%u. Old is \"%s\"->ino #%u\n", new->name, new->ino, (*prev)->name, (*prev)->ino));
  35                                 jffs2_mark_node_obsolete(c, new->raw);
  36                                 jffs2_free_full_dirent(new);
  37                         } else {
  38                                 D1(printk(KERN_DEBUG "Marking old dirent node (ino #%u) obsolete\n", (*prev)->ino));
  39                                 new->next = (*prev)->next;
  40                                 jffs2_mark_node_obsolete(c, ((*prev)->raw));
  41                                 jffs2_free_full_dirent(*prev);
  42                                 *prev = new;
  43                         }
  44                         goto out;
  45                 }
  46                 prev = &((*prev)->next);
  47         }
  48         new->next = *prev;
  49         *prev = new;
  50
  51  out:
  52         D2(while(*list) {
  53                 printk(KERN_DEBUG "Dirent \"%s\" (hash 0x%08x, ino #%u\n", (*list)->name, (*list)->nhash, (*list)->ino);
  54                 list = &(*list)->next;
  55         });
  56 }
  57
  58 /* Put a new tmp_dnode_info into the list, keeping the list in
  59    order of increasing version
  60 */
  61 void jffs2_add_tn_to_list(struct jffs2_tmp_dnode_info *tn, struct jffs2_tmp_dnode_info **list)
  62 {
  63         struct jffs2_tmp_dnode_info **prev = list;
  64
  65         while ((*prev) && (*prev)->version < tn->version) {
  66                 prev = &((*prev)->next);
  67         }
  68         tn->next = (*prev);
  69         *prev = tn;
  70 }
  71
  72 static void jffs2_free_tmp_dnode_info_list(struct jffs2_tmp_dnode_info *tn)
  73 {
  74         struct jffs2_tmp_dnode_info *next;
  75
  76         while (tn) {
  77                 next = tn;
  78                 tn = tn->next;
  79                 jffs2_free_full_dnode(next->fn);
  80                 jffs2_free_tmp_dnode_info(next);
  81         }
  82 }
  83
  84 static void jffs2_free_full_dirent_list(struct jffs2_full_dirent *fd)
  85 {
  86         struct jffs2_full_dirent *next;
  87
  88         while (fd) {
  89                 next = fd->next;
  90                 jffs2_free_full_dirent(fd);
  91                 fd = next;
  92         }
  93 }
  94
  95
  96 /* Get tmp_dnode_info and full_dirent for all non-obsolete nodes associated
  97    with this ino, returning the former in order of version */
  98
  99 int jffs2_get_inode_nodes(struct jffs2_sb_info *c, ino_t ino, struct jffs2_inode_info *f,
 100                           struct jffs2_tmp_dnode_info **tnp, struct jffs2_full_dirent **fdp,
 101                           uint32_t *highest_version, uint32_t *latest_mctime,
 102                           uint32_t *mctime_ver)
 103 {
 104         struct jffs2_raw_node_ref *ref = f->inocache->nodes;
 105         struct jffs2_tmp_dnode_info *tn, *ret_tn = NULL;
 106         struct jffs2_full_dirent *fd, *ret_fd = NULL;
 107
 108         union jffs2_node_union node;
 109         size_t retlen;
 110         int err;
 111
 112         *mctime_ver = 0;
 113
 114         D1(printk(KERN_DEBUG "jffs2_get_inode_nodes(): ino #%lu\n", ino));
 115         if (!f->inocache->nodes) {
 116                 printk(KERN_WARNING "Eep. no nodes for ino #%lu\n", (unsigned long)ino);
 117         }
 118
 119         spin_lock(&c->erase_completion_lock);
 120
 121         for (ref = f->inocache->nodes; ref && ref->next_in_ino; ref = ref->next_in_ino) {
 122                 /* Work out whether it's a data node or a dirent node */
 123                 if (ref_obsolete(ref)) {
 124                         /* FIXME: On NAND flash we may need to read these */
 125                         D1(printk(KERN_DEBUG "node at 0x%08x is obsoleted. Ignoring.\n", ref_offset(ref)));
 126                         continue;
 127                 }
 128                 /* We can hold a pointer to a non-obsolete node without the spinlock,
 129                    but _obsolete_ nodes may disappear at any time, if the block
 130                    they're in gets erased */
 131                 spin_unlock(&c->erase_completion_lock);
 132
 133                 cond_resched();
 134
 135                 /* FIXME: point() */
 136                 err = jffs2_flash_read(c, (ref_offset(ref)), min_t(uint32_t, ref->totlen, sizeof(node)), &retlen, (void *)&node);
 137                 if (err) {
 138                         printk(KERN_WARNING "error %d reading node at 0x%08x in get_inode_nodes()\n", err, ref_offset(ref));
 139                         goto free_out;
 140                 }
 141
 142
 143                         /* Check we've managed to read at least the common node header */
 144                 if (retlen < min_t(uint32_t, ref->totlen, sizeof(node.u))) {
 145                         printk(KERN_WARNING "short read in get_inode_nodes()\n");
 146                         err = -EIO;
 147                         goto free_out;
 148                 }
 149
 150                 switch (je16_to_cpu(node.u.nodetype)) {
 151                 case JFFS2_NODETYPE_DIRENT:
 152                         D1(printk(KERN_DEBUG "Node at %08x (%d) is a dirent node\n", ref_offset(ref), ref_flags(ref)));
 153                         if (ref_flags(ref) == REF_UNCHECKED) {
 154                                 printk(KERN_WARNING "BUG: Dirent node at 0x%08x never got checked? How?\n", ref_offset(ref));
 155                                 BUG();
 156                         }
 157                         if (retlen < sizeof(node.d)) {
 158                                 printk(KERN_WARNING "short read in get_inode_nodes()\n");
 159                                 err = -EIO;
 160                                 goto free_out;
 161                         }
 162                         /* sanity check */
 163                         if (PAD((node.d.nsize + sizeof (node.d))) != PAD(je32_to_cpu (node.d.totlen))) {
 164                                 printk(KERN_NOTICE "jffs2_get_inode_nodes(): Illegal nsize in node at 0x%08x: nsize 0x%02x, totlen %04x\n",
 165                                        ref_offset(ref), node.d.nsize, je32_to_cpu(node.d.totlen));
 166                                 jffs2_mark_node_obsolete(c, ref);
 167                                 spin_lock(&c->erase_completion_lock);
 168                                 continue;
 169                         }
 170                         if (je32_to_cpu(node.d.version) > *highest_version)
 171                                 *highest_version = je32_to_cpu(node.d.version);
 172                         if (ref_obsolete(ref)) {
 173                                 /* Obsoleted. This cannot happen, surely? dwmw2 20020308 */
 174                                 printk(KERN_ERR "Dirent node at 0x%08x became obsolete while we weren't looking\n",
 175                                        ref_offset(ref));
 176                                 BUG();
 177                         }
 178
 179                         fd = jffs2_alloc_full_dirent(node.d.nsize+1);
 180                         if (!fd) {
 181                                 err = -ENOMEM;
 182                                 goto free_out;
 183                         }
 184                         memset(fd,0,sizeof(struct jffs2_full_dirent) + node.d.nsize+1);
 185                         fd->raw = ref;
 186                         fd->version = je32_to_cpu(node.d.version);
 187                         fd->ino = je32_to_cpu(node.d.ino);
 188                         fd->type = node.d.type;
 189
 190                         /* Pick out the mctime of the latest dirent */
 191                         if(fd->version > *mctime_ver) {
 192                                 *mctime_ver = fd->version;
 193                                 *latest_mctime = je32_to_cpu(node.d.mctime);
 194                         }
 195
 196                         /* memcpy as much of the name as possible from the raw
 197                            dirent we've already read from the flash
 198                         */
 199                         if (retlen > sizeof(struct jffs2_raw_dirent))
 200                                 memcpy(&fd->name[0], &node.d.name[0], min_t(uint32_t, node.d.nsize, (retlen-sizeof(struct jffs2_raw_dirent))));
 201
 202                         /* Do we need to copy any more of the name directly
 203                            from the flash?
 204                         */
 205                         if (node.d.nsize + sizeof(struct jffs2_raw_dirent) > retlen) {
 206                                 /* FIXME: point() */
 207                                 int already = retlen - sizeof(struct jffs2_raw_dirent);
 208
 209                                 err = jffs2_flash_read(c, (ref_offset(ref)) + retlen,
 210                                                    node.d.nsize - already, &retlen, &fd->name[already]);
 211                                 if (!err && retlen != node.d.nsize - already)
 212                                         err = -EIO;
 213
 214                                 if (err) {
 215                                         printk(KERN_WARNING "Read remainder of name in jffs2_get_inode_nodes(): error %d\n", err);
 216                                         jffs2_free_full_dirent(fd);
 217                                         goto free_out;
 218                                 }
 219                         }
 220                         fd->nhash = full_name_hash(fd->name, node.d.nsize);
 221                         fd->next = NULL;
 222                                 /* Wheee. We now have a complete jffs2_full_dirent structure, with
 223                                    the name in it and everything. Link it into the list
 224                                 */
 225                         D1(printk(KERN_DEBUG "Adding fd \"%s\", ino #%u\n", fd->name, fd->ino));
 226                         jffs2_add_fd_to_list(c, fd, &ret_fd);
 227                         break;
 228
 229                 case JFFS2_NODETYPE_INODE:
 230                         D1(printk(KERN_DEBUG "Node at %08x (%d) is a data node\n", ref_offset(ref), ref_flags(ref)));
 231                         if (retlen < sizeof(node.i)) {
 232                                 printk(KERN_WARNING "read too short for dnode\n");
 233                                 err = -EIO;
 234                                 goto free_out;
 235                         }
 236                         if (je32_to_cpu(node.i.version) > *highest_version)
 237                                 *highest_version = je32_to_cpu(node.i.version);
 238                         D1(printk(KERN_DEBUG "version %d, highest_version now %d\n", je32_to_cpu(node.i.version), *highest_version));
 239
 240                         if (ref_obsolete(ref)) {
 241                                 /* Obsoleted. This cannot happen, surely? dwmw2 20020308 */
 242                                 printk(KERN_ERR "Inode node at 0x%08x became obsolete while we weren't looking\n",
 243                                        ref_offset(ref));
 244                                 BUG();
 245                         }
 246
 247                         /* If we've never checked the CRCs on this node, check them now. */
 248                         if (ref_flags(ref) == REF_UNCHECKED) {
 249                                 uint32_t crc;
 250                                 struct jffs2_eraseblock *jeb;
 251
 252                                 crc = crc32(0, &node, sizeof(node.i)-8);
 253                                 if (crc != je32_to_cpu(node.i.node_crc)) {
 254                                         printk(KERN_NOTICE "jffs2_get_inode_nodes(): CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n",
 255                                                ref_offset(ref), je32_to_cpu(node.i.node_crc), crc);
 256                                         jffs2_mark_node_obsolete(c, ref);
 257                                         spin_lock(&c->erase_completion_lock);
 258                                         continue;
 259                                 }
 260
 261                                 /* sanity checks */
 262                                 if ( je32_to_cpu(node.i.offset) > je32_to_cpu(node.i.isize) ||
 263                                      PAD(je32_to_cpu(node.i.csize) + sizeof (node.i)) != PAD(je32_to_cpu(node.i.totlen))) {
 264                                         printk(KERN_NOTICE "jffs2_get_inode_nodes(): Inode corrupted at 0x%08x, totlen %d, #ino  %d, version %d, isize %d, csize %d, dsize %d \n",
 265                                                 ref_offset(ref),  je32_to_cpu(node.i.totlen),  je32_to_cpu(node.i.ino),
 266                                                 je32_to_cpu(node.i.version),  je32_to_cpu(node.i.isize),
 267                                                 je32_to_cpu(node.i.csize), je32_to_cpu(node.i.dsize));
 268                                         jffs2_mark_node_obsolete(c, ref);
 269                                         spin_lock(&c->erase_completion_lock);
 270                                         continue;
 271                                 }
 272
 273                                 if (node.i.compr != JFFS2_COMPR_ZERO && je32_to_cpu(node.i.csize)) {
 274                                         unsigned char *buf=NULL;
 275                                         uint32_t pointed = 0;
 276 #ifndef __ECOS
 277                                         if (c->mtd->point) {
 278                                                 err = c->mtd->point (c->mtd, ref_offset(ref) + sizeof(node.i), je32_to_cpu(node.i.csize),
 279                                                                      &retlen, &buf);
 280                                                 if (!err && retlen < je32_to_cpu(node.i.csize)) {
 281                                                         D1(printk(KERN_DEBUG "MTD point returned len too short: 0x%zx\n", retlen));
 282                                                         c->mtd->unpoint(c->mtd, buf, ref_offset(ref) + sizeof(node.i), je32_to_cpu(node.i.csize));
 283                                                 } else if (err){
 284                                                         D1(printk(KERN_DEBUG "MTD point failed %d\n", err));
 285                                                 } else
 286                                                         pointed = 1; /* succefully pointed to device */
 287                                         }
 288 #endif
 289                                         if(!pointed){
 290                                                 buf = kmalloc(je32_to_cpu(node.i.csize), GFP_KERNEL);
 291                                                 if (!buf)
 292                                                         return -ENOMEM;
 293
 294                                                 err = jffs2_flash_read(c, ref_offset(ref) + sizeof(node.i), je32_to_cpu(node.i.csize),
 295                                                                        &retlen, buf);
 296                                                 if (!err && retlen != je32_to_cpu(node.i.csize))
 297                                                         err = -EIO;
 298                                                 if (err) {
 299                                                         kfree(buf);
 300                                                         return err;
 301                                                 }
 302                                         }
 303                                         crc = crc32(0, buf, je32_to_cpu(node.i.csize));
 304                                         if(!pointed)
 305                                                 kfree(buf);
 306 #ifndef __ECOS
 307                                         else
 308                                                 c->mtd->unpoint(c->mtd, buf, ref_offset(ref) + sizeof(node.i), je32_to_cpu(node.i.csize));
 309 #endif
 310
 311                                         if (crc != je32_to_cpu(node.i.data_crc)) {
 312                                                 printk(KERN_NOTICE "jffs2_get_inode_nodes(): Data CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n",
 313                                                        ref_offset(ref), je32_to_cpu(node.i.data_crc), crc);
 314                                                 jffs2_mark_node_obsolete(c, ref);
 315                                                 spin_lock(&c->erase_completion_lock);
 316                                                 continue;
 317                                         }
 318
 319                                 }
 320
 321                                 /* Mark the node as having been checked and fix the accounting accordingly */
 322                                 spin_lock(&c->erase_completion_lock);
 323                                 jeb = &c->blocks[ref->flash_offset / c->sector_size];
 324                                 jeb->used_size += ref->totlen;
 325                                 jeb->unchecked_size -= ref->totlen;
 326                                 c->used_size += ref->totlen;
 327                                 c->unchecked_size -= ref->totlen;
 328
 329                                 /* If node covers at least a whole page, or if it starts at the
 330                                    beginning of a page and runs to the end of the file, or if
 331                                    it's a hole node, mark it REF_PRISTINE, else REF_NORMAL.
 332
 333                                    If it's actually overlapped, it'll get made NORMAL (or OBSOLETE)
 334                                    when the overlapping node(s) get added to the tree anyway.
 335                                 */
 336                                 if ((je32_to_cpu(node.i.dsize) >= PAGE_CACHE_SIZE) ||
 337                                     ( ((je32_to_cpu(node.i.offset)&(PAGE_CACHE_SIZE-1))==0) &&
 338                                       (je32_to_cpu(node.i.dsize)+je32_to_cpu(node.i.offset) ==  je32_to_cpu(node.i.isize)))) {
 339                                         D1(printk(KERN_DEBUG "Marking node at 0x%08x REF_PRISTINE\n", ref_offset(ref)));
 340                                         ref->flash_offset = ref_offset(ref) | REF_PRISTINE;
 341                                 } else {
 342                                         D1(printk(KERN_DEBUG "Marking node at 0x%08x REF_NORMAL\n", ref_offset(ref)));
 343                                         ref->flash_offset = ref_offset(ref) | REF_NORMAL;
 344                                 }
 345                                 spin_unlock(&c->erase_completion_lock);
 346                         }
 347
 348                         tn = jffs2_alloc_tmp_dnode_info();
 349                         if (!tn) {
 350                                 D1(printk(KERN_DEBUG "alloc tn failed\n"));
 351                                 err = -ENOMEM;
 352                                 goto free_out;
 353                         }
 354
 355                         tn->fn = jffs2_alloc_full_dnode();
 356                         if (!tn->fn) {
 357                                 D1(printk(KERN_DEBUG "alloc fn failed\n"));
 358                                 err = -ENOMEM;
 359                                 jffs2_free_tmp_dnode_info(tn);
 360                                 goto free_out;
 361                         }
 362                         tn->version = je32_to_cpu(node.i.version);
 363                         tn->fn->ofs = je32_to_cpu(node.i.offset);
 364                         /* There was a bug where we wrote hole nodes out with
 365                            csize/dsize swapped. Deal with it */
 366                         if (node.i.compr == JFFS2_COMPR_ZERO && !je32_to_cpu(node.i.dsize) && je32_to_cpu(node.i.csize))
 367                                 tn->fn->size = je32_to_cpu(node.i.csize);
 368                         else // normal case...
 369                                 tn->fn->size = je32_to_cpu(node.i.dsize);
 370                         tn->fn->raw = ref;
 371                         D1(printk(KERN_DEBUG "dnode @%08x: ver %u, offset %04x, dsize %04x\n",
 372                                   ref_offset(ref), je32_to_cpu(node.i.version),
 373                                   je32_to_cpu(node.i.offset), je32_to_cpu(node.i.dsize)));
 374                         jffs2_add_tn_to_list(tn, &ret_tn);
 375                         break;
 376
 377                 default:
 378                         if (ref_flags(ref) == REF_UNCHECKED) {
 379                                 struct jffs2_eraseblock *jeb;
 380
 381                                 printk(KERN_ERR "Eep. Unknown node type %04x at %08x was marked REF_UNCHECKED\n",
 382                                        je16_to_cpu(node.u.nodetype), ref_offset(ref));
 383
 384                                 /* Mark the node as having been checked and fix the accounting accordingly */
 385                                 spin_lock(&c->erase_completion_lock);
 386                                 jeb = &c->blocks[ref->flash_offset / c->sector_size];
 387                                 jeb->used_size += ref->totlen;
 388                                 jeb->unchecked_size -= ref->totlen;
 389                                 c->used_size += ref->totlen;
 390                                 c->unchecked_size -= ref->totlen;
 391
 392                                 mark_ref_normal(ref);
 393                                 spin_unlock(&c->erase_completion_lock);
 394                         }
 395                         node.u.nodetype = cpu_to_je16(JFFS2_NODE_ACCURATE | je16_to_cpu(node.u.nodetype));
 396                         if (crc32(0, &node, sizeof(struct jffs2_unknown_node)-4) != je32_to_cpu(node.u.hdr_crc)) {
 397                                 /* Hmmm. This should have been caught at scan time. */
 398                                 printk(KERN_ERR "Node header CRC failed at %08x. But it must have been OK earlier.\n",
 399                                        ref_offset(ref));
 400                                 printk(KERN_ERR "Node was: { %04x, %04x, %08x, %08x }\n",
 401                                        je16_to_cpu(node.u.magic), je16_to_cpu(node.u.nodetype), je32_to_cpu(node.u.totlen),
 402                                        je32_to_cpu(node.u.hdr_crc));
 403                                 jffs2_mark_node_obsolete(c, ref);
 404                         } else switch(je16_to_cpu(node.u.nodetype) & JFFS2_COMPAT_MASK) {
 405                         case JFFS2_FEATURE_INCOMPAT:
 406                                 printk(KERN_NOTICE "Unknown INCOMPAT nodetype %04X at %08x\n", je16_to_cpu(node.u.nodetype), ref_offset(ref));
 407                                 /* EEP */
 408                                 BUG();
 409                                 break;
 410                         case JFFS2_FEATURE_ROCOMPAT:
 411                                 printk(KERN_NOTICE "Unknown ROCOMPAT nodetype %04X at %08x\n", je16_to_cpu(node.u.nodetype), ref_offset(ref));
 412                                 if (!(c->flags & JFFS2_SB_FLAG_RO))
 413                                         BUG();
 414                                 break;
 415                         case JFFS2_FEATURE_RWCOMPAT_COPY:
 416                                 printk(KERN_NOTICE "Unknown RWCOMPAT_COPY nodetype %04X at %08x\n", je16_to_cpu(node.u.nodetype), ref_offset(ref));
 417                                 break;
 418                         case JFFS2_FEATURE_RWCOMPAT_DELETE:
 419                                 printk(KERN_NOTICE "Unknown RWCOMPAT_DELETE nodetype %04X at %08x\n", je16_to_cpu(node.u.nodetype), ref_offset(ref));
 420                                 jffs2_mark_node_obsolete(c, ref);
 421                                 break;
 422                         }
 423
 424                 }
 425                 spin_lock(&c->erase_completion_lock);
 426
 427         }
 428         spin_unlock(&c->erase_completion_lock);
 429         *tnp = ret_tn;
 430         *fdp = ret_fd;
 431
 432         return 0;
 433
 434  free_out:
 435         jffs2_free_tmp_dnode_info_list(ret_tn);
 436         jffs2_free_full_dirent_list(ret_fd);
 437         return err;
 438 }
 439
 440 void jffs2_set_inocache_state(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic, int state)
 441 {
 442         spin_lock(&c->inocache_lock);
 443         ic->state = state;
 444         wake_up(&c->inocache_wq);
 445         spin_unlock(&c->inocache_lock);
 446 }
 447
 448 /* During mount, this needs no locking. During normal operation, its
 449    callers want to do other stuff while still holding the inocache_lock.
 450    Rather than introducing special case get_ino_cache functions or
 451    callbacks, we just let the caller do the locking itself. */
 452
 453 struct jffs2_inode_cache *jffs2_get_ino_cache(struct jffs2_sb_info *c, uint32_t ino)
 454 {
 455         struct jffs2_inode_cache *ret;
 456
 457         D2(printk(KERN_DEBUG "jffs2_get_ino_cache(): ino %u\n", ino));
 458
 459         ret = c->inocache_list[ino % INOCACHE_HASHSIZE];
 460         while (ret && ret->ino < ino) {
 461                 ret = ret->next;
 462         }
 463
 464         if (ret && ret->ino != ino)
 465                 ret = NULL;
 466
 467         D2(printk(KERN_DEBUG "jffs2_get_ino_cache found %p for ino %u\n", ret, ino));
 468         return ret;
 469 }
 470
 471 void jffs2_add_ino_cache (struct jffs2_sb_info *c, struct jffs2_inode_cache *new)
 472 {
 473         struct jffs2_inode_cache **prev;
 474         D2(printk(KERN_DEBUG "jffs2_add_ino_cache: Add %p (ino #%u)\n", new, new->ino));
 475         spin_lock(&c->inocache_lock);
 476
 477         prev = &c->inocache_list[new->ino % INOCACHE_HASHSIZE];
 478
 479         while ((*prev) && (*prev)->ino < new->ino) {
 480                 prev = &(*prev)->next;
 481         }
 482         new->next = *prev;
 483         *prev = new;
 484
 485         spin_unlock(&c->inocache_lock);
 486 }
 487
 488 void jffs2_del_ino_cache(struct jffs2_sb_info *c, struct jffs2_inode_cache *old)
 489 {
 490         struct jffs2_inode_cache **prev;
 491         D2(printk(KERN_DEBUG "jffs2_del_ino_cache: Del %p (ino #%u)\n", old, old->ino));
 492         spin_lock(&c->inocache_lock);
 493
 494         prev = &c->inocache_list[old->ino % INOCACHE_HASHSIZE];
 495
 496         while ((*prev) && (*prev)->ino < old->ino) {
 497                 prev = &(*prev)->next;
 498         }
 499         if ((*prev) == old) {
 500                 *prev = old->next;
 501         }
 502
 503         spin_unlock(&c->inocache_lock);
 504 }
 505
 506 void jffs2_free_ino_caches(struct jffs2_sb_info *c)
 507 {
 508         int i;
 509         struct jffs2_inode_cache *this, *next;
 510
 511         for (i=0; i<INOCACHE_HASHSIZE; i++) {
 512                 this = c->inocache_list[i];
 513                 while (this) {
 514                         next = this->next;
 515                         D2(printk(KERN_DEBUG "jffs2_free_ino_caches: Freeing ino #%u at %p\n", this->ino, this));
 516                         jffs2_free_inode_cache(this);
 517                         this = next;
 518                 }
 519                 c->inocache_list[i] = NULL;
 520         }
 521 }
 522
 523 void jffs2_free_raw_node_refs(struct jffs2_sb_info *c)
 524 {
 525         int i;
 526         struct jffs2_raw_node_ref *this, *next;
 527
 528         for (i=0; i<c->nr_blocks; i++) {
 529                 this = c->blocks[i].first_node;
 530                 while(this) {
 531                         next = this->next_phys;
 532                         jffs2_free_raw_node_ref(this);
 533                         this = next;
 534                 }
 535                 c->blocks[i].first_node = c->blocks[i].last_node = NULL;
 536         }
 537 }
 538
 539 struct jffs2_node_frag *jffs2_lookup_node_frag(struct rb_root *fragtree, uint32_t offset)
 540 {
 541         /* The common case in lookup is that there will be a node
 542            which precisely matches. So we go looking for that first */
 543         struct rb_node *next;
 544         struct jffs2_node_frag *prev = NULL;
 545         struct jffs2_node_frag *frag = NULL;
 546
 547         D2(printk(KERN_DEBUG "jffs2_lookup_node_frag(%p, %d)\n", fragtree, offset));
 548
 549         next = fragtree->rb_node;
 550
 551         while(next) {
 552                 frag = rb_entry(next, struct jffs2_node_frag, rb);
 553
 554                 D2(printk(KERN_DEBUG "Considering frag %d-%d (%p). left %p, right %p\n",
 555                           frag->ofs, frag->ofs+frag->size, frag, frag->rb.rb_left, frag->rb.rb_right));
 556                 if (frag->ofs + frag->size <= offset) {
 557                         D2(printk(KERN_DEBUG "Going right from frag %d-%d, before the region we care about\n",
 558                                   frag->ofs, frag->ofs+frag->size));
 559                         /* Remember the closest smaller match on the way down */
 560                         if (!prev || frag->ofs > prev->ofs)
 561                                 prev = frag;
 562                         next = frag->rb.rb_right;
 563                 } else if (frag->ofs > offset) {
 564                         D2(printk(KERN_DEBUG "Going left from frag %d-%d, after the region we care about\n",
 565                                   frag->ofs, frag->ofs+frag->size));
 566                         next = frag->rb.rb_left;
 567                 } else {
 568                         D2(printk(KERN_DEBUG "Returning frag %d,%d, matched\n",
 569                                   frag->ofs, frag->ofs+frag->size));
 570                         return frag;
 571                 }
 572         }
 573
 574         /* Exact match not found. Go back up looking at each parent,
 575            and return the closest smaller one */
 576
 577         if (prev)
 578                 D2(printk(KERN_DEBUG "No match. Returning frag %d,%d, closest previous\n",
 579                           prev->ofs, prev->ofs+prev->size));
 580         else
 581                 D2(printk(KERN_DEBUG "Returning NULL, empty fragtree\n"));
 582
 583         return prev;
 584 }
 585
 586 /* Pass 'c' argument to indicate that nodes should be marked obsolete as
 587    they're killed. */
 588 void jffs2_kill_fragtree(struct rb_root *root, struct jffs2_sb_info *c)
 589 {
 590         struct jffs2_node_frag *frag;
 591         struct jffs2_node_frag *parent;
 592
 593         if (!root->rb_node)
 594                 return;
 595
 596         frag = (rb_entry(root->rb_node, struct jffs2_node_frag, rb));
 597
 598         while(frag) {
 599                 if (frag->rb.rb_left) {
 600                         D2(printk(KERN_DEBUG "Going left from frag (%p) %d-%d\n",
 601                                   frag, frag->ofs, frag->ofs+frag->size));
 602                         frag = frag_left(frag);
 603                         continue;
 604                 }
 605                 if (frag->rb.rb_right) {
 606                         D2(printk(KERN_DEBUG "Going right from frag (%p) %d-%d\n",
 607                                   frag, frag->ofs, frag->ofs+frag->size));
 608                         frag = frag_right(frag);
 609                         continue;
 610                 }
 611
 612                 D2(printk(KERN_DEBUG "jffs2_kill_fragtree: frag at 0x%x-0x%x: node %p, frags %d--\n",
 613                           frag->ofs, frag->ofs+frag->size, frag->node,
 614                           frag->node?frag->node->frags:0));
 615
 616                 if (frag->node && !(--frag->node->frags)) {
 617                         /* Not a hole, and it's the final remaining frag
 618                            of this node. Free the node */
 619                         if (c)
 620                                 jffs2_mark_node_obsolete(c, frag->node->raw);
 621
 622                         jffs2_free_full_dnode(frag->node);
 623                 }
 624                 parent = frag_parent(frag);
 625                 if (parent) {
 626                         if (frag_left(parent) == frag)
 627                                 parent->rb.rb_left = NULL;
 628                         else
 629                                 parent->rb.rb_right = NULL;
 630                 }
 631
 632                 jffs2_free_node_frag(frag);
 633                 frag = parent;
 634         }
 635 }
 636
 637 void jffs2_fragtree_insert(struct jffs2_node_frag *newfrag, struct jffs2_node_frag *base)
 638 {
 639         struct rb_node *parent = &base->rb;
 640         struct rb_node **link = &parent;
 641
 642         D2(printk(KERN_DEBUG "jffs2_fragtree_insert(%p; %d-%d, %p)\n", newfrag,
 643                   newfrag->ofs, newfrag->ofs+newfrag->size, base));
 644
 645         while (*link) {
 646                 parent = *link;
 647                 base = rb_entry(parent, struct jffs2_node_frag, rb);
 648
 649                 D2(printk(KERN_DEBUG "fragtree_insert considering frag at 0x%x\n", base->ofs));
 650                 if (newfrag->ofs > base->ofs)
 651                         link = &base->rb.rb_right;
 652                 else if (newfrag->ofs < base->ofs)
 653                         link = &base->rb.rb_left;
 654                 else {
 655                         printk(KERN_CRIT "Duplicate frag at %08x (%p,%p)\n", newfrag->ofs, newfrag, base);
 656                         BUG();
 657                 }
 658         }
 659
 660         rb_link_node(&newfrag->rb, &base->rb, link);
 661 }