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initial commit with v2.6.9
[linux-2.6.9-moxart.git] / fs / jffs2 / nodelist.c
blobb359f8a14220d6de92d5b2e70a919bd1097e078d
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 1.86 2003/10/31 15:37:51 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 static 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)),
137 min_t(uint32_t, ref_totlen(c, NULL, ref), sizeof(node)),
138 &retlen, (void *)&node);
139 if (err) {
140 printk(KERN_WARNING "error %d reading node at 0x%08x in get_inode_nodes()\n", err, ref_offset(ref));
141 goto free_out;
142 }
143
144
145 /* Check we've managed to read at least the common node header */
146 if (retlen < min_t(uint32_t, ref_totlen(c, NULL, ref), sizeof(node.u))) {
147 printk(KERN_WARNING "short read in get_inode_nodes()\n");
148 err = -EIO;
149 goto free_out;
150 }
151
152 switch (je16_to_cpu(node.u.nodetype)) {
153 case JFFS2_NODETYPE_DIRENT:
154 D1(printk(KERN_DEBUG "Node at %08x (%d) is a dirent node\n", ref_offset(ref), ref_flags(ref)));
155 if (ref_flags(ref) == REF_UNCHECKED) {
156 printk(KERN_WARNING "BUG: Dirent node at 0x%08x never got checked? How?\n", ref_offset(ref));
157 BUG();
158 }
159 if (retlen < sizeof(node.d)) {
160 printk(KERN_WARNING "short read in get_inode_nodes()\n");
161 err = -EIO;
162 goto free_out;
163 }
164 /* sanity check */
165 if (PAD((node.d.nsize + sizeof (node.d))) != PAD(je32_to_cpu (node.d.totlen))) {
166 printk(KERN_NOTICE "jffs2_get_inode_nodes(): Illegal nsize in node at 0x%08x: nsize 0x%02x, totlen %04x\n",
167 ref_offset(ref), node.d.nsize, je32_to_cpu(node.d.totlen));
168 jffs2_mark_node_obsolete(c, ref);
169 spin_lock(&c->erase_completion_lock);
170 continue;
171 }
172 if (je32_to_cpu(node.d.version) > *highest_version)
173 *highest_version = je32_to_cpu(node.d.version);
174 if (ref_obsolete(ref)) {
175 /* Obsoleted. This cannot happen, surely? dwmw2 20020308 */
176 printk(KERN_ERR "Dirent node at 0x%08x became obsolete while we weren't looking\n",
177 ref_offset(ref));
178 BUG();
179 }
180
181 fd = jffs2_alloc_full_dirent(node.d.nsize+1);
182 if (!fd) {
183 err = -ENOMEM;
184 goto free_out;
185 }
186 memset(fd,0,sizeof(struct jffs2_full_dirent) + node.d.nsize+1);
187 fd->raw = ref;
188 fd->version = je32_to_cpu(node.d.version);
189 fd->ino = je32_to_cpu(node.d.ino);
190 fd->type = node.d.type;
191
192 /* Pick out the mctime of the latest dirent */
193 if(fd->version > *mctime_ver) {
194 *mctime_ver = fd->version;
195 *latest_mctime = je32_to_cpu(node.d.mctime);
196 }
197
198 /* memcpy as much of the name as possible from the raw
199 dirent we've already read from the flash
200 */
201 if (retlen > sizeof(struct jffs2_raw_dirent))
202 memcpy(&fd->name[0], &node.d.name[0], min_t(uint32_t, node.d.nsize, (retlen-sizeof(struct jffs2_raw_dirent))));
203
204 /* Do we need to copy any more of the name directly
205 from the flash?
206 */
207 if (node.d.nsize + sizeof(struct jffs2_raw_dirent) > retlen) {
208 /* FIXME: point() */
209 int already = retlen - sizeof(struct jffs2_raw_dirent);
210
211 err = jffs2_flash_read(c, (ref_offset(ref)) + retlen,
212 node.d.nsize - already, &retlen, &fd->name[already]);
213 if (!err && retlen != node.d.nsize - already)
214 err = -EIO;
215
216 if (err) {
217 printk(KERN_WARNING "Read remainder of name in jffs2_get_inode_nodes(): error %d\n", err);
218 jffs2_free_full_dirent(fd);
219 goto free_out;
220 }
221 }
222 fd->nhash = full_name_hash(fd->name, node.d.nsize);
223 fd->next = NULL;
224 /* Wheee. We now have a complete jffs2_full_dirent structure, with
225 the name in it and everything. Link it into the list
226 */
227 D1(printk(KERN_DEBUG "Adding fd \"%s\", ino #%u\n", fd->name, fd->ino));
228 jffs2_add_fd_to_list(c, fd, &ret_fd);
229 break;
230
231 case JFFS2_NODETYPE_INODE:
232 D1(printk(KERN_DEBUG "Node at %08x (%d) is a data node\n", ref_offset(ref), ref_flags(ref)));
233 if (retlen < sizeof(node.i)) {
234 printk(KERN_WARNING "read too short for dnode\n");
235 err = -EIO;
236 goto free_out;
237 }
238 if (je32_to_cpu(node.i.version) > *highest_version)
239 *highest_version = je32_to_cpu(node.i.version);
240 D1(printk(KERN_DEBUG "version %d, highest_version now %d\n", je32_to_cpu(node.i.version), *highest_version));
241
242 if (ref_obsolete(ref)) {
243 /* Obsoleted. This cannot happen, surely? dwmw2 20020308 */
244 printk(KERN_ERR "Inode node at 0x%08x became obsolete while we weren't looking\n",
245 ref_offset(ref));
246 BUG();
247 }
248
249 /* If we've never checked the CRCs on this node, check them now. */
250 if (ref_flags(ref) == REF_UNCHECKED) {
251 uint32_t crc, len;
252 struct jffs2_eraseblock *jeb;
253
254 crc = crc32(0, &node, sizeof(node.i)-8);
255 if (crc != je32_to_cpu(node.i.node_crc)) {
256 printk(KERN_NOTICE "jffs2_get_inode_nodes(): CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n",
257 ref_offset(ref), je32_to_cpu(node.i.node_crc), crc);
258 jffs2_mark_node_obsolete(c, ref);
259 spin_lock(&c->erase_completion_lock);
260 continue;
261 }
262
263 /* sanity checks */
264 if ( je32_to_cpu(node.i.offset) > je32_to_cpu(node.i.isize) ||
265 PAD(je32_to_cpu(node.i.csize) + sizeof (node.i)) != PAD(je32_to_cpu(node.i.totlen))) {
266 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",
267 ref_offset(ref), je32_to_cpu(node.i.totlen), je32_to_cpu(node.i.ino),
268 je32_to_cpu(node.i.version), je32_to_cpu(node.i.isize),
269 je32_to_cpu(node.i.csize), je32_to_cpu(node.i.dsize));
270 jffs2_mark_node_obsolete(c, ref);
271 spin_lock(&c->erase_completion_lock);
272 continue;
273 }
274
275 if (node.i.compr != JFFS2_COMPR_ZERO && je32_to_cpu(node.i.csize)) {
276 unsigned char *buf=NULL;
277 uint32_t pointed = 0;
278 #ifndef __ECOS
279 if (c->mtd->point) {
280 err = c->mtd->point (c->mtd, ref_offset(ref) + sizeof(node.i), je32_to_cpu(node.i.csize),
281 &retlen, &buf);
282 if (!err && retlen < je32_to_cpu(node.i.csize)) {
283 D1(printk(KERN_DEBUG "MTD point returned len too short: 0x%zx\n", retlen));
284 c->mtd->unpoint(c->mtd, buf, ref_offset(ref) + sizeof(node.i), je32_to_cpu(node.i.csize));
285 } else if (err){
286 D1(printk(KERN_DEBUG "MTD point failed %d\n", err));
287 } else
288 pointed = 1; /* succefully pointed to device */
289 }
290 #endif
291 if(!pointed){
292 buf = kmalloc(je32_to_cpu(node.i.csize), GFP_KERNEL);
293 if (!buf)
294 return -ENOMEM;
295
296 err = jffs2_flash_read(c, ref_offset(ref) + sizeof(node.i), je32_to_cpu(node.i.csize),
297 &retlen, buf);
298 if (!err && retlen != je32_to_cpu(node.i.csize))
299 err = -EIO;
300 if (err) {
301 kfree(buf);
302 return err;
303 }
304 }
305 crc = crc32(0, buf, je32_to_cpu(node.i.csize));
306 if(!pointed)
307 kfree(buf);
308 #ifndef __ECOS
309 else
310 c->mtd->unpoint(c->mtd, buf, ref_offset(ref) + sizeof(node.i), je32_to_cpu(node.i.csize));
311 #endif
312
313 if (crc != je32_to_cpu(node.i.data_crc)) {
314 printk(KERN_NOTICE "jffs2_get_inode_nodes(): Data CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n",
315 ref_offset(ref), je32_to_cpu(node.i.data_crc), crc);
316 jffs2_mark_node_obsolete(c, ref);
317 spin_lock(&c->erase_completion_lock);
318 continue;
319 }
320
321 }
322
323 /* Mark the node as having been checked and fix the accounting accordingly */
324 spin_lock(&c->erase_completion_lock);
325 jeb = &c->blocks[ref->flash_offset / c->sector_size];
326 len = ref_totlen(c, jeb, ref);
327
328 jeb->used_size += len;
329 jeb->unchecked_size -= len;
330 c->used_size += len;
331 c->unchecked_size -= len;
332
333 /* If node covers at least a whole page, or if it starts at the
334 beginning of a page and runs to the end of the file, or if
335 it's a hole node, mark it REF_PRISTINE, else REF_NORMAL.
336
337 If it's actually overlapped, it'll get made NORMAL (or OBSOLETE)
338 when the overlapping node(s) get added to the tree anyway.
339 */
340 if ((je32_to_cpu(node.i.dsize) >= PAGE_CACHE_SIZE) ||
341 ( ((je32_to_cpu(node.i.offset)&(PAGE_CACHE_SIZE-1))==0) &&
342 (je32_to_cpu(node.i.dsize)+je32_to_cpu(node.i.offset) == je32_to_cpu(node.i.isize)))) {
343 D1(printk(KERN_DEBUG "Marking node at 0x%08x REF_PRISTINE\n", ref_offset(ref)));
344 ref->flash_offset = ref_offset(ref) | REF_PRISTINE;
345 } else {
346 D1(printk(KERN_DEBUG "Marking node at 0x%08x REF_NORMAL\n", ref_offset(ref)));
347 ref->flash_offset = ref_offset(ref) | REF_NORMAL;
348 }
349 spin_unlock(&c->erase_completion_lock);
350 }
351
352 tn = jffs2_alloc_tmp_dnode_info();
353 if (!tn) {
354 D1(printk(KERN_DEBUG "alloc tn failed\n"));
355 err = -ENOMEM;
356 goto free_out;
357 }
358
359 tn->fn = jffs2_alloc_full_dnode();
360 if (!tn->fn) {
361 D1(printk(KERN_DEBUG "alloc fn failed\n"));
362 err = -ENOMEM;
363 jffs2_free_tmp_dnode_info(tn);
364 goto free_out;
365 }
366 tn->version = je32_to_cpu(node.i.version);
367 tn->fn->ofs = je32_to_cpu(node.i.offset);
368 /* There was a bug where we wrote hole nodes out with
369 csize/dsize swapped. Deal with it */
370 if (node.i.compr == JFFS2_COMPR_ZERO && !je32_to_cpu(node.i.dsize) && je32_to_cpu(node.i.csize))
371 tn->fn->size = je32_to_cpu(node.i.csize);
372 else // normal case...
373 tn->fn->size = je32_to_cpu(node.i.dsize);
374 tn->fn->raw = ref;
375 D1(printk(KERN_DEBUG "dnode @%08x: ver %u, offset %04x, dsize %04x\n",
376 ref_offset(ref), je32_to_cpu(node.i.version),
377 je32_to_cpu(node.i.offset), je32_to_cpu(node.i.dsize)));
378 jffs2_add_tn_to_list(tn, &ret_tn);
379 break;
380
381 default:
382 if (ref_flags(ref) == REF_UNCHECKED) {
383 struct jffs2_eraseblock *jeb;
384 uint32_t len;
385
386 printk(KERN_ERR "Eep. Unknown node type %04x at %08x was marked REF_UNCHECKED\n",
387 je16_to_cpu(node.u.nodetype), ref_offset(ref));
388
389 /* Mark the node as having been checked and fix the accounting accordingly */
390 spin_lock(&c->erase_completion_lock);
391 jeb = &c->blocks[ref->flash_offset / c->sector_size];
392 len = ref_totlen(c, jeb, ref);
393
394 jeb->used_size += len;
395 jeb->unchecked_size -= len;
396 c->used_size += len;
397 c->unchecked_size -= len;
398
399 mark_ref_normal(ref);
400 spin_unlock(&c->erase_completion_lock);
401 }
402 node.u.nodetype = cpu_to_je16(JFFS2_NODE_ACCURATE | je16_to_cpu(node.u.nodetype));
403 if (crc32(0, &node, sizeof(struct jffs2_unknown_node)-4) != je32_to_cpu(node.u.hdr_crc)) {
404 /* Hmmm. This should have been caught at scan time. */
405 printk(KERN_ERR "Node header CRC failed at %08x. But it must have been OK earlier.\n",
406 ref_offset(ref));
407 printk(KERN_ERR "Node was: { %04x, %04x, %08x, %08x }\n",
408 je16_to_cpu(node.u.magic), je16_to_cpu(node.u.nodetype), je32_to_cpu(node.u.totlen),
409 je32_to_cpu(node.u.hdr_crc));
410 jffs2_mark_node_obsolete(c, ref);
411 } else switch(je16_to_cpu(node.u.nodetype) & JFFS2_COMPAT_MASK) {
412 case JFFS2_FEATURE_INCOMPAT:
413 printk(KERN_NOTICE "Unknown INCOMPAT nodetype %04X at %08x\n", je16_to_cpu(node.u.nodetype), ref_offset(ref));
414 /* EEP */
415 BUG();
416 break;
417 case JFFS2_FEATURE_ROCOMPAT:
418 printk(KERN_NOTICE "Unknown ROCOMPAT nodetype %04X at %08x\n", je16_to_cpu(node.u.nodetype), ref_offset(ref));
419 if (!(c->flags & JFFS2_SB_FLAG_RO))
420 BUG();
421 break;
422 case JFFS2_FEATURE_RWCOMPAT_COPY:
423 printk(KERN_NOTICE "Unknown RWCOMPAT_COPY nodetype %04X at %08x\n", je16_to_cpu(node.u.nodetype), ref_offset(ref));
424 break;
425 case JFFS2_FEATURE_RWCOMPAT_DELETE:
426 printk(KERN_NOTICE "Unknown RWCOMPAT_DELETE nodetype %04X at %08x\n", je16_to_cpu(node.u.nodetype), ref_offset(ref));
427 jffs2_mark_node_obsolete(c, ref);
428 break;
429 }
430
431 }
432 spin_lock(&c->erase_completion_lock);
433
434 }
435 spin_unlock(&c->erase_completion_lock);
436 *tnp = ret_tn;
437 *fdp = ret_fd;
438
439 return 0;
440
441 free_out:
442 jffs2_free_tmp_dnode_info_list(ret_tn);
443 jffs2_free_full_dirent_list(ret_fd);
444 return err;
445 }
446
447 void jffs2_set_inocache_state(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic, int state)
448 {
449 spin_lock(&c->inocache_lock);
450 ic->state = state;
451 wake_up(&c->inocache_wq);
452 spin_unlock(&c->inocache_lock);
453 }
454
455 /* During mount, this needs no locking. During normal operation, its
456 callers want to do other stuff while still holding the inocache_lock.
457 Rather than introducing special case get_ino_cache functions or
458 callbacks, we just let the caller do the locking itself. */
459
460 struct jffs2_inode_cache *jffs2_get_ino_cache(struct jffs2_sb_info *c, uint32_t ino)
461 {
462 struct jffs2_inode_cache *ret;
463
464 D2(printk(KERN_DEBUG "jffs2_get_ino_cache(): ino %u\n", ino));
465
466 ret = c->inocache_list[ino % INOCACHE_HASHSIZE];
467 while (ret && ret->ino < ino) {
468 ret = ret->next;
469 }
470
471 if (ret && ret->ino != ino)
472 ret = NULL;
473
474 D2(printk(KERN_DEBUG "jffs2_get_ino_cache found %p for ino %u\n", ret, ino));
475 return ret;
476 }
477
478 void jffs2_add_ino_cache (struct jffs2_sb_info *c, struct jffs2_inode_cache *new)
479 {
480 struct jffs2_inode_cache **prev;
481 D2(printk(KERN_DEBUG "jffs2_add_ino_cache: Add %p (ino #%u)\n", new, new->ino));
482 spin_lock(&c->inocache_lock);
483
484 prev = &c->inocache_list[new->ino % INOCACHE_HASHSIZE];
485
486 while ((*prev) && (*prev)->ino < new->ino) {
487 prev = &(*prev)->next;
488 }
489 new->next = *prev;
490 *prev = new;
491
492 spin_unlock(&c->inocache_lock);
493 }
494
495 void jffs2_del_ino_cache(struct jffs2_sb_info *c, struct jffs2_inode_cache *old)
496 {
497 struct jffs2_inode_cache **prev;
498 D2(printk(KERN_DEBUG "jffs2_del_ino_cache: Del %p (ino #%u)\n", old, old->ino));
499 spin_lock(&c->inocache_lock);
500
501 prev = &c->inocache_list[old->ino % INOCACHE_HASHSIZE];
502
503 while ((*prev) && (*prev)->ino < old->ino) {
504 prev = &(*prev)->next;
505 }
506 if ((*prev) == old) {
507 *prev = old->next;
508 }
509
510 spin_unlock(&c->inocache_lock);
511 }
512
513 void jffs2_free_ino_caches(struct jffs2_sb_info *c)
514 {
515 int i;
516 struct jffs2_inode_cache *this, *next;
517
518 for (i=0; i<INOCACHE_HASHSIZE; i++) {
519 this = c->inocache_list[i];
520 while (this) {
521 next = this->next;
522 D2(printk(KERN_DEBUG "jffs2_free_ino_caches: Freeing ino #%u at %p\n", this->ino, this));
523 jffs2_free_inode_cache(this);
524 this = next;
525 }
526 c->inocache_list[i] = NULL;
527 }
528 }
529
530 void jffs2_free_raw_node_refs(struct jffs2_sb_info *c)
531 {
532 int i;
533 struct jffs2_raw_node_ref *this, *next;
534
535 for (i=0; i<c->nr_blocks; i++) {
536 this = c->blocks[i].first_node;
537 while(this) {
538 next = this->next_phys;
539 jffs2_free_raw_node_ref(this);
540 this = next;
541 }
542 c->blocks[i].first_node = c->blocks[i].last_node = NULL;
543 }
544 }
545
546 struct jffs2_node_frag *jffs2_lookup_node_frag(struct rb_root *fragtree, uint32_t offset)
547 {
548 /* The common case in lookup is that there will be a node
549 which precisely matches. So we go looking for that first */
550 struct rb_node *next;
551 struct jffs2_node_frag *prev = NULL;
552 struct jffs2_node_frag *frag = NULL;
553
554 D2(printk(KERN_DEBUG "jffs2_lookup_node_frag(%p, %d)\n", fragtree, offset));
555
556 next = fragtree->rb_node;
557
558 while(next) {
559 frag = rb_entry(next, struct jffs2_node_frag, rb);
560
561 D2(printk(KERN_DEBUG "Considering frag %d-%d (%p). left %p, right %p\n",
562 frag->ofs, frag->ofs+frag->size, frag, frag->rb.rb_left, frag->rb.rb_right));
563 if (frag->ofs + frag->size <= offset) {
564 D2(printk(KERN_DEBUG "Going right from frag %d-%d, before the region we care about\n",
565 frag->ofs, frag->ofs+frag->size));
566 /* Remember the closest smaller match on the way down */
567 if (!prev || frag->ofs > prev->ofs)
568 prev = frag;
569 next = frag->rb.rb_right;
570 } else if (frag->ofs > offset) {
571 D2(printk(KERN_DEBUG "Going left from frag %d-%d, after the region we care about\n",
572 frag->ofs, frag->ofs+frag->size));
573 next = frag->rb.rb_left;
574 } else {
575 D2(printk(KERN_DEBUG "Returning frag %d,%d, matched\n",
576 frag->ofs, frag->ofs+frag->size));
577 return frag;
578 }
579 }
580
581 /* Exact match not found. Go back up looking at each parent,
582 and return the closest smaller one */
583
584 if (prev)
585 D2(printk(KERN_DEBUG "No match. Returning frag %d,%d, closest previous\n",
586 prev->ofs, prev->ofs+prev->size));
587 else
588 D2(printk(KERN_DEBUG "Returning NULL, empty fragtree\n"));
589
590 return prev;
591 }
592
593 /* Pass 'c' argument to indicate that nodes should be marked obsolete as
594 they're killed. */
595 void jffs2_kill_fragtree(struct rb_root *root, struct jffs2_sb_info *c)
596 {
597 struct jffs2_node_frag *frag;
598 struct jffs2_node_frag *parent;
599
600 if (!root->rb_node)
601 return;
602
603 frag = (rb_entry(root->rb_node, struct jffs2_node_frag, rb));
604
605 while(frag) {
606 if (frag->rb.rb_left) {
607 D2(printk(KERN_DEBUG "Going left from frag (%p) %d-%d\n",
608 frag, frag->ofs, frag->ofs+frag->size));
609 frag = frag_left(frag);
610 continue;
611 }
612 if (frag->rb.rb_right) {
613 D2(printk(KERN_DEBUG "Going right from frag (%p) %d-%d\n",
614 frag, frag->ofs, frag->ofs+frag->size));
615 frag = frag_right(frag);
616 continue;
617 }
618
619 D2(printk(KERN_DEBUG "jffs2_kill_fragtree: frag at 0x%x-0x%x: node %p, frags %d--\n",
620 frag->ofs, frag->ofs+frag->size, frag->node,
621 frag->node?frag->node->frags:0));
622
623 if (frag->node && !(--frag->node->frags)) {
624 /* Not a hole, and it's the final remaining frag
625 of this node. Free the node */
626 if (c)
627 jffs2_mark_node_obsolete(c, frag->node->raw);
628
629 jffs2_free_full_dnode(frag->node);
630 }
631 parent = frag_parent(frag);
632 if (parent) {
633 if (frag_left(parent) == frag)
634 parent->rb.rb_left = NULL;
635 else
636 parent->rb.rb_right = NULL;
637 }
638
639 jffs2_free_node_frag(frag);
640 frag = parent;
641
642 cond_resched();
643 }
644 }
645
646 void jffs2_fragtree_insert(struct jffs2_node_frag *newfrag, struct jffs2_node_frag *base)
647 {
648 struct rb_node *parent = &base->rb;
649 struct rb_node **link = &parent;
650
651 D2(printk(KERN_DEBUG "jffs2_fragtree_insert(%p; %d-%d, %p)\n", newfrag,
652 newfrag->ofs, newfrag->ofs+newfrag->size, base));
653
654 while (*link) {
655 parent = *link;
656 base = rb_entry(parent, struct jffs2_node_frag, rb);
657
658 D2(printk(KERN_DEBUG "fragtree_insert considering frag at 0x%x\n", base->ofs));
659 if (newfrag->ofs > base->ofs)
660 link = &base->rb.rb_right;
661 else if (newfrag->ofs < base->ofs)
662 link = &base->rb.rb_left;
663 else {
664 printk(KERN_CRIT "Duplicate frag at %08x (%p,%p)\n", newfrag->ofs, newfrag, base);
665 BUG();
666 }
667 }
668
669 rb_link_node(&newfrag->rb, &base->rb, link);
670 }
MOXA 2.6.9 from sdlinux-moxaart.tgz