Commit | Line | Data |
---|---|---|
1da177e4 LT |
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@infradead.org> | |
7 | * | |
8 | * For licensing information, see the file 'LICENCE' in this directory. | |
9 | * | |
182ec4ee | 10 | * $Id: nodelist.c,v 1.115 2005/11/07 11:14:40 gleixner Exp $ |
1da177e4 LT |
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; | |
182ec4ee | 27 | |
733802d9 | 28 | dbg_dentlist("add dirent \"%s\", ino #%u\n", new->name, new->ino); |
1da177e4 LT |
29 | |
30 | while ((*prev) && (*prev)->nhash <= new->nhash) { | |
31 | if ((*prev)->nhash == new->nhash && !strcmp((*prev)->name, new->name)) { | |
32 | /* Duplicate. Free one */ | |
33 | if (new->version < (*prev)->version) { | |
733802d9 | 34 | dbg_dentlist("Eep! Marking new dirent node is obsolete, old is \"%s\", ino #%u\n", |
e0d60137 | 35 | (*prev)->name, (*prev)->ino); |
1da177e4 LT |
36 | jffs2_mark_node_obsolete(c, new->raw); |
37 | jffs2_free_full_dirent(new); | |
38 | } else { | |
733802d9 | 39 | dbg_dentlist("marking old dirent \"%s\", ino #%u bsolete\n", |
e0d60137 | 40 | (*prev)->name, (*prev)->ino); |
1da177e4 LT |
41 | new->next = (*prev)->next; |
42 | jffs2_mark_node_obsolete(c, ((*prev)->raw)); | |
43 | jffs2_free_full_dirent(*prev); | |
44 | *prev = new; | |
45 | } | |
e0d60137 | 46 | return; |
1da177e4 LT |
47 | } |
48 | prev = &((*prev)->next); | |
49 | } | |
50 | new->next = *prev; | |
51 | *prev = new; | |
1da177e4 LT |
52 | } |
53 | ||
1e900979 AB |
54 | void jffs2_truncate_fragtree(struct jffs2_sb_info *c, struct rb_root *list, uint32_t size) |
55 | { | |
56 | struct jffs2_node_frag *frag = jffs2_lookup_node_frag(list, size); | |
57 | ||
733802d9 | 58 | dbg_fragtree("truncating fragtree to 0x%08x bytes\n", size); |
1e900979 AB |
59 | |
60 | /* We know frag->ofs <= size. That's what lookup does for us */ | |
61 | if (frag && frag->ofs != size) { | |
1e0da3cb | 62 | if (frag->ofs+frag->size > size) { |
1e900979 AB |
63 | frag->size = size - frag->ofs; |
64 | } | |
65 | frag = frag_next(frag); | |
66 | } | |
67 | while (frag && frag->ofs >= size) { | |
68 | struct jffs2_node_frag *next = frag_next(frag); | |
69 | ||
1e900979 AB |
70 | frag_erase(frag, list); |
71 | jffs2_obsolete_node_frag(c, frag); | |
72 | frag = next; | |
73 | } | |
1e0da3cb AB |
74 | |
75 | if (size == 0) | |
76 | return; | |
77 | ||
182ec4ee | 78 | /* |
1e0da3cb AB |
79 | * If the last fragment starts at the RAM page boundary, it is |
80 | * REF_PRISTINE irrespective of its size. | |
81 | */ | |
82 | frag = frag_last(list); | |
f0507530 | 83 | if (frag->node && (frag->ofs & (PAGE_CACHE_SIZE - 1)) == 0) { |
733802d9 | 84 | dbg_fragtree2("marking the last fragment 0x%08x-0x%08x REF_PRISTINE.\n", |
182ec4ee | 85 | frag->ofs, frag->ofs + frag->size); |
1e0da3cb AB |
86 | frag->node->raw->flash_offset = ref_offset(frag->node->raw) | REF_PRISTINE; |
87 | } | |
1e900979 AB |
88 | } |
89 | ||
f97117d1 | 90 | void jffs2_obsolete_node_frag(struct jffs2_sb_info *c, struct jffs2_node_frag *this) |
1da177e4 | 91 | { |
f97117d1 AB |
92 | if (this->node) { |
93 | this->node->frags--; | |
94 | if (!this->node->frags) { | |
95 | /* The node has no valid frags left. It's totally obsoleted */ | |
733802d9 | 96 | dbg_fragtree2("marking old node @0x%08x (0x%04x-0x%04x) obsolete\n", |
e0d60137 | 97 | ref_offset(this->node->raw), this->node->ofs, this->node->ofs+this->node->size); |
f97117d1 AB |
98 | jffs2_mark_node_obsolete(c, this->node->raw); |
99 | jffs2_free_full_dnode(this->node); | |
100 | } else { | |
733802d9 | 101 | dbg_fragtree2("marking old node @0x%08x (0x%04x-0x%04x) REF_NORMAL. frags is %d\n", |
e0d60137 | 102 | ref_offset(this->node->raw), this->node->ofs, this->node->ofs+this->node->size, this->node->frags); |
f97117d1 AB |
103 | mark_ref_normal(this->node->raw); |
104 | } | |
182ec4ee | 105 | |
f97117d1 AB |
106 | } |
107 | jffs2_free_node_frag(this); | |
1da177e4 LT |
108 | } |
109 | ||
f97117d1 | 110 | static void jffs2_fragtree_insert(struct jffs2_node_frag *newfrag, struct jffs2_node_frag *base) |
1da177e4 | 111 | { |
f97117d1 AB |
112 | struct rb_node *parent = &base->rb; |
113 | struct rb_node **link = &parent; | |
9dee7503 | 114 | |
733802d9 | 115 | dbg_fragtree2("insert frag (0x%04x-0x%04x)\n", newfrag->ofs, newfrag->ofs + newfrag->size); |
9dee7503 | 116 | |
f97117d1 AB |
117 | while (*link) { |
118 | parent = *link; | |
119 | base = rb_entry(parent, struct jffs2_node_frag, rb); | |
182ec4ee | 120 | |
f97117d1 AB |
121 | if (newfrag->ofs > base->ofs) |
122 | link = &base->rb.rb_right; | |
123 | else if (newfrag->ofs < base->ofs) | |
124 | link = &base->rb.rb_left; | |
9dee7503 | 125 | else { |
e0d60137 | 126 | JFFS2_ERROR("duplicate frag at %08x (%p,%p)\n", newfrag->ofs, newfrag, base); |
f97117d1 | 127 | BUG(); |
9dee7503 | 128 | } |
1da177e4 | 129 | } |
f97117d1 AB |
130 | |
131 | rb_link_node(&newfrag->rb, &base->rb, link); | |
1da177e4 LT |
132 | } |
133 | ||
1e0da3cb AB |
134 | /* |
135 | * Allocate and initializes a new fragment. | |
136 | */ | |
137 | static inline struct jffs2_node_frag * new_fragment(struct jffs2_full_dnode *fn, uint32_t ofs, uint32_t size) | |
138 | { | |
139 | struct jffs2_node_frag *newfrag; | |
182ec4ee | 140 | |
1e0da3cb AB |
141 | newfrag = jffs2_alloc_node_frag(); |
142 | if (likely(newfrag)) { | |
143 | newfrag->ofs = ofs; | |
144 | newfrag->size = size; | |
145 | newfrag->node = fn; | |
146 | } else { | |
147 | JFFS2_ERROR("cannot allocate a jffs2_node_frag object\n"); | |
148 | } | |
149 | ||
150 | return newfrag; | |
151 | } | |
152 | ||
153 | /* | |
154 | * Called when there is no overlapping fragment exist. Inserts a hole before the new | |
155 | * fragment and inserts the new fragment to the fragtree. | |
156 | */ | |
157 | static int no_overlapping_node(struct jffs2_sb_info *c, struct rb_root *root, | |
158 | struct jffs2_node_frag *newfrag, | |
159 | struct jffs2_node_frag *this, uint32_t lastend) | |
160 | { | |
161 | if (lastend < newfrag->node->ofs) { | |
162 | /* put a hole in before the new fragment */ | |
163 | struct jffs2_node_frag *holefrag; | |
164 | ||
165 | holefrag= new_fragment(NULL, lastend, newfrag->node->ofs - lastend); | |
166 | if (unlikely(!holefrag)) { | |
167 | jffs2_free_node_frag(newfrag); | |
168 | return -ENOMEM; | |
169 | } | |
170 | ||
171 | if (this) { | |
182ec4ee | 172 | /* By definition, the 'this' node has no right-hand child, |
1e0da3cb AB |
173 | because there are no frags with offset greater than it. |
174 | So that's where we want to put the hole */ | |
733802d9 | 175 | dbg_fragtree2("add hole frag %#04x-%#04x on the right of the new frag.\n", |
1e0da3cb AB |
176 | holefrag->ofs, holefrag->ofs + holefrag->size); |
177 | rb_link_node(&holefrag->rb, &this->rb, &this->rb.rb_right); | |
178 | } else { | |
733802d9 | 179 | dbg_fragtree2("Add hole frag %#04x-%#04x to the root of the tree.\n", |
1e0da3cb AB |
180 | holefrag->ofs, holefrag->ofs + holefrag->size); |
181 | rb_link_node(&holefrag->rb, NULL, &root->rb_node); | |
182 | } | |
183 | rb_insert_color(&holefrag->rb, root); | |
184 | this = holefrag; | |
185 | } | |
182ec4ee | 186 | |
1e0da3cb | 187 | if (this) { |
182ec4ee | 188 | /* By definition, the 'this' node has no right-hand child, |
1e0da3cb AB |
189 | because there are no frags with offset greater than it. |
190 | So that's where we want to put new fragment */ | |
733802d9 | 191 | dbg_fragtree2("add the new node at the right\n"); |
182ec4ee | 192 | rb_link_node(&newfrag->rb, &this->rb, &this->rb.rb_right); |
1e0da3cb | 193 | } else { |
733802d9 | 194 | dbg_fragtree2("insert the new node at the root of the tree\n"); |
1e0da3cb AB |
195 | rb_link_node(&newfrag->rb, NULL, &root->rb_node); |
196 | } | |
197 | rb_insert_color(&newfrag->rb, root); | |
198 | ||
199 | return 0; | |
200 | } | |
201 | ||
f97117d1 | 202 | /* Doesn't set inode->i_size */ |
1e0da3cb | 203 | static int jffs2_add_frag_to_fragtree(struct jffs2_sb_info *c, struct rb_root *root, struct jffs2_node_frag *newfrag) |
1da177e4 | 204 | { |
f97117d1 AB |
205 | struct jffs2_node_frag *this; |
206 | uint32_t lastend; | |
1da177e4 | 207 | |
f97117d1 | 208 | /* Skip all the nodes which are completed before this one starts */ |
1e0da3cb | 209 | this = jffs2_lookup_node_frag(root, newfrag->node->ofs); |
1da177e4 | 210 | |
f97117d1 | 211 | if (this) { |
733802d9 | 212 | dbg_fragtree2("lookup gave frag 0x%04x-0x%04x; phys 0x%08x (*%p)\n", |
e0d60137 | 213 | this->ofs, this->ofs+this->size, this->node?(ref_offset(this->node->raw)):0xffffffff, this); |
f97117d1 AB |
214 | lastend = this->ofs + this->size; |
215 | } else { | |
733802d9 | 216 | dbg_fragtree2("lookup gave no frag\n"); |
f97117d1 | 217 | lastend = 0; |
1da177e4 | 218 | } |
182ec4ee | 219 | |
1e0da3cb | 220 | /* See if we ran off the end of the fragtree */ |
f97117d1 AB |
221 | if (lastend <= newfrag->ofs) { |
222 | /* We did */ | |
223 | ||
224 | /* Check if 'this' node was on the same page as the new node. | |
225 | If so, both 'this' and the new node get marked REF_NORMAL so | |
226 | the GC can take a look. | |
227 | */ | |
228 | if (lastend && (lastend-1) >> PAGE_CACHE_SHIFT == newfrag->ofs >> PAGE_CACHE_SHIFT) { | |
229 | if (this->node) | |
230 | mark_ref_normal(this->node->raw); | |
231 | mark_ref_normal(newfrag->node->raw); | |
232 | } | |
1da177e4 | 233 | |
1e0da3cb | 234 | return no_overlapping_node(c, root, newfrag, this, lastend); |
dae6227f | 235 | } |
dae6227f | 236 | |
1e0da3cb | 237 | if (this->node) |
733802d9 | 238 | dbg_fragtree2("dealing with frag %u-%u, phys %#08x(%d).\n", |
1e0da3cb AB |
239 | this->ofs, this->ofs + this->size, |
240 | ref_offset(this->node->raw), ref_flags(this->node->raw)); | |
241 | else | |
733802d9 | 242 | dbg_fragtree2("dealing with hole frag %u-%u.\n", |
1e0da3cb | 243 | this->ofs, this->ofs + this->size); |
dae6227f | 244 | |
f97117d1 | 245 | /* OK. 'this' is pointing at the first frag that newfrag->ofs at least partially obsoletes, |
182ec4ee | 246 | * - i.e. newfrag->ofs < this->ofs+this->size && newfrag->ofs >= this->ofs |
dae6227f | 247 | */ |
f97117d1 AB |
248 | if (newfrag->ofs > this->ofs) { |
249 | /* This node isn't completely obsoleted. The start of it remains valid */ | |
250 | ||
251 | /* Mark the new node and the partially covered node REF_NORMAL -- let | |
252 | the GC take a look at them */ | |
253 | mark_ref_normal(newfrag->node->raw); | |
254 | if (this->node) | |
255 | mark_ref_normal(this->node->raw); | |
256 | ||
257 | if (this->ofs + this->size > newfrag->ofs + newfrag->size) { | |
258 | /* The new node splits 'this' frag into two */ | |
1e0da3cb AB |
259 | struct jffs2_node_frag *newfrag2; |
260 | ||
f97117d1 | 261 | if (this->node) |
733802d9 | 262 | dbg_fragtree2("split old frag 0x%04x-0x%04x, phys 0x%08x\n", |
e0d60137 | 263 | this->ofs, this->ofs+this->size, ref_offset(this->node->raw)); |
182ec4ee | 264 | else |
733802d9 | 265 | dbg_fragtree2("split old hole frag 0x%04x-0x%04x\n", |
8d5df409 | 266 | this->ofs, this->ofs+this->size); |
182ec4ee | 267 | |
f97117d1 | 268 | /* New second frag pointing to this's node */ |
1e0da3cb AB |
269 | newfrag2 = new_fragment(this->node, newfrag->ofs + newfrag->size, |
270 | this->ofs + this->size - newfrag->ofs - newfrag->size); | |
271 | if (unlikely(!newfrag2)) | |
272 | return -ENOMEM; | |
f97117d1 AB |
273 | if (this->node) |
274 | this->node->frags++; | |
275 | ||
276 | /* Adjust size of original 'this' */ | |
277 | this->size = newfrag->ofs - this->ofs; | |
278 | ||
279 | /* Now, we know there's no node with offset | |
280 | greater than this->ofs but smaller than | |
281 | newfrag2->ofs or newfrag->ofs, for obvious | |
282 | reasons. So we can do a tree insert from | |
283 | 'this' to insert newfrag, and a tree insert | |
284 | from newfrag to insert newfrag2. */ | |
285 | jffs2_fragtree_insert(newfrag, this); | |
1e0da3cb | 286 | rb_insert_color(&newfrag->rb, root); |
182ec4ee | 287 | |
f97117d1 | 288 | jffs2_fragtree_insert(newfrag2, newfrag); |
1e0da3cb | 289 | rb_insert_color(&newfrag2->rb, root); |
182ec4ee | 290 | |
f97117d1 | 291 | return 0; |
dae6227f | 292 | } |
f97117d1 AB |
293 | /* New node just reduces 'this' frag in size, doesn't split it */ |
294 | this->size = newfrag->ofs - this->ofs; | |
dae6227f | 295 | |
f97117d1 AB |
296 | /* Again, we know it lives down here in the tree */ |
297 | jffs2_fragtree_insert(newfrag, this); | |
1e0da3cb | 298 | rb_insert_color(&newfrag->rb, root); |
f97117d1 | 299 | } else { |
182ec4ee | 300 | /* New frag starts at the same point as 'this' used to. Replace |
f97117d1 | 301 | it in the tree without doing a delete and insertion */ |
733802d9 | 302 | dbg_fragtree2("inserting newfrag (*%p),%d-%d in before 'this' (*%p),%d-%d\n", |
e0d60137 | 303 | newfrag, newfrag->ofs, newfrag->ofs+newfrag->size, this, this->ofs, this->ofs+this->size); |
182ec4ee | 304 | |
1e0da3cb | 305 | rb_replace_node(&this->rb, &newfrag->rb, root); |
182ec4ee | 306 | |
f97117d1 | 307 | if (newfrag->ofs + newfrag->size >= this->ofs+this->size) { |
733802d9 | 308 | dbg_fragtree2("obsoleting node frag %p (%x-%x)\n", this, this->ofs, this->ofs+this->size); |
f97117d1 | 309 | jffs2_obsolete_node_frag(c, this); |
dae6227f | 310 | } else { |
f97117d1 AB |
311 | this->ofs += newfrag->size; |
312 | this->size -= newfrag->size; | |
313 | ||
314 | jffs2_fragtree_insert(this, newfrag); | |
1e0da3cb | 315 | rb_insert_color(&this->rb, root); |
f97117d1 | 316 | return 0; |
dae6227f | 317 | } |
dae6227f | 318 | } |
f97117d1 | 319 | /* OK, now we have newfrag added in the correct place in the tree, but |
182ec4ee | 320 | frag_next(newfrag) may be a fragment which is overlapped by it |
f97117d1 AB |
321 | */ |
322 | while ((this = frag_next(newfrag)) && newfrag->ofs + newfrag->size >= this->ofs + this->size) { | |
323 | /* 'this' frag is obsoleted completely. */ | |
733802d9 | 324 | dbg_fragtree2("obsoleting node frag %p (%x-%x) and removing from tree\n", |
e0d60137 | 325 | this, this->ofs, this->ofs+this->size); |
1e0da3cb | 326 | rb_erase(&this->rb, root); |
f97117d1 | 327 | jffs2_obsolete_node_frag(c, this); |
dae6227f | 328 | } |
182ec4ee | 329 | /* Now we're pointing at the first frag which isn't totally obsoleted by |
f97117d1 | 330 | the new frag */ |
dae6227f | 331 | |
1e0da3cb | 332 | if (!this || newfrag->ofs + newfrag->size == this->ofs) |
f97117d1 | 333 | return 0; |
1e0da3cb | 334 | |
f97117d1 AB |
335 | /* Still some overlap but we don't need to move it in the tree */ |
336 | this->size = (this->ofs + this->size) - (newfrag->ofs + newfrag->size); | |
337 | this->ofs = newfrag->ofs + newfrag->size; | |
338 | ||
339 | /* And mark them REF_NORMAL so the GC takes a look at them */ | |
340 | if (this->node) | |
341 | mark_ref_normal(this->node->raw); | |
342 | mark_ref_normal(newfrag->node->raw); | |
dae6227f AB |
343 | |
344 | return 0; | |
345 | } | |
346 | ||
182ec4ee | 347 | /* |
1e0da3cb AB |
348 | * Given an inode, probably with existing tree of fragments, add the new node |
349 | * to the fragment tree. | |
dae6227f | 350 | */ |
f97117d1 | 351 | int jffs2_add_full_dnode_to_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, struct jffs2_full_dnode *fn) |
dae6227f | 352 | { |
f97117d1 AB |
353 | int ret; |
354 | struct jffs2_node_frag *newfrag; | |
dae6227f | 355 | |
f97117d1 AB |
356 | if (unlikely(!fn->size)) |
357 | return 0; | |
dae6227f | 358 | |
1e0da3cb | 359 | newfrag = new_fragment(fn, fn->ofs, fn->size); |
f97117d1 AB |
360 | if (unlikely(!newfrag)) |
361 | return -ENOMEM; | |
1e0da3cb | 362 | newfrag->node->frags = 1; |
1da177e4 | 363 | |
733802d9 | 364 | dbg_fragtree("adding node %#04x-%#04x @0x%08x on flash, newfrag *%p\n", |
e0d60137 | 365 | fn->ofs, fn->ofs+fn->size, ref_offset(fn->raw), newfrag); |
182ec4ee | 366 | |
f97117d1 AB |
367 | ret = jffs2_add_frag_to_fragtree(c, &f->fragtree, newfrag); |
368 | if (unlikely(ret)) | |
369 | return ret; | |
370 | ||
371 | /* If we now share a page with other nodes, mark either previous | |
372 | or next node REF_NORMAL, as appropriate. */ | |
373 | if (newfrag->ofs & (PAGE_CACHE_SIZE-1)) { | |
374 | struct jffs2_node_frag *prev = frag_prev(newfrag); | |
375 | ||
376 | mark_ref_normal(fn->raw); | |
182ec4ee | 377 | /* If we don't start at zero there's _always_ a previous */ |
f97117d1 AB |
378 | if (prev->node) |
379 | mark_ref_normal(prev->node->raw); | |
380 | } | |
1da177e4 | 381 | |
f97117d1 AB |
382 | if ((newfrag->ofs+newfrag->size) & (PAGE_CACHE_SIZE-1)) { |
383 | struct jffs2_node_frag *next = frag_next(newfrag); | |
182ec4ee | 384 | |
f97117d1 AB |
385 | if (next) { |
386 | mark_ref_normal(fn->raw); | |
387 | if (next->node) | |
388 | mark_ref_normal(next->node->raw); | |
1da177e4 | 389 | } |
1da177e4 | 390 | } |
f97117d1 | 391 | jffs2_dbg_fragtree_paranoia_check_nolock(f); |
1e0da3cb AB |
392 | |
393 | return 0; | |
394 | } | |
395 | ||
396 | /* | |
397 | * Check the data CRC of the node. | |
398 | * | |
399 | * Returns: 0 if the data CRC is correct; | |
400 | * 1 - if incorrect; | |
401 | * error code if an error occured. | |
402 | */ | |
403 | static int check_node_data(struct jffs2_sb_info *c, struct jffs2_tmp_dnode_info *tn) | |
404 | { | |
405 | struct jffs2_raw_node_ref *ref = tn->fn->raw; | |
406 | int err = 0, pointed = 0; | |
407 | struct jffs2_eraseblock *jeb; | |
408 | unsigned char *buffer; | |
409 | uint32_t crc, ofs, retlen, len; | |
410 | ||
411 | BUG_ON(tn->csize == 0); | |
412 | ||
733802d9 AB |
413 | if (!jffs2_is_writebuffered(c)) |
414 | goto adj_acc; | |
182ec4ee | 415 | |
1e0da3cb AB |
416 | /* Calculate how many bytes were already checked */ |
417 | ofs = ref_offset(ref) + sizeof(struct jffs2_raw_inode); | |
733802d9 | 418 | len = ofs % c->wbuf_pagesize; |
280562b2 AB |
419 | if (likely(len)) |
420 | len = c->wbuf_pagesize - len; | |
1e0da3cb AB |
421 | |
422 | if (len >= tn->csize) { | |
733802d9 | 423 | dbg_readinode("no need to check node at %#08x, data length %u, data starts at %#08x - it has already been checked.\n", |
1e0da3cb AB |
424 | ref_offset(ref), tn->csize, ofs); |
425 | goto adj_acc; | |
426 | } | |
182ec4ee | 427 | |
1e0da3cb AB |
428 | ofs += len; |
429 | len = tn->csize - len; | |
182ec4ee | 430 | |
733802d9 | 431 | dbg_readinode("check node at %#08x, data length %u, partial CRC %#08x, correct CRC %#08x, data starts at %#08x, start checking from %#08x - %u bytes.\n", |
1e0da3cb | 432 | ref_offset(ref), tn->csize, tn->partial_crc, tn->data_crc, ofs - len, ofs, len); |
182ec4ee | 433 | |
1e0da3cb AB |
434 | #ifndef __ECOS |
435 | /* TODO: instead, incapsulate point() stuff to jffs2_flash_read(), | |
436 | * adding and jffs2_flash_read_end() interface. */ | |
437 | if (c->mtd->point) { | |
438 | err = c->mtd->point(c->mtd, ofs, len, &retlen, &buffer); | |
439 | if (!err && retlen < tn->csize) { | |
440 | JFFS2_WARNING("MTD point returned len too short: %u instead of %u.\n", retlen, tn->csize); | |
441 | c->mtd->unpoint(c->mtd, buffer, ofs, len); | |
442 | } else if (err) | |
443 | JFFS2_WARNING("MTD point failed: error code %d.\n", err); | |
444 | else | |
445 | pointed = 1; /* succefully pointed to device */ | |
446 | } | |
447 | #endif | |
182ec4ee | 448 | |
1e0da3cb AB |
449 | if (!pointed) { |
450 | buffer = kmalloc(len, GFP_KERNEL); | |
451 | if (unlikely(!buffer)) | |
452 | return -ENOMEM; | |
182ec4ee | 453 | |
1e0da3cb AB |
454 | /* TODO: this is very frequent pattern, make it a separate |
455 | * routine */ | |
456 | err = jffs2_flash_read(c, ofs, len, &retlen, buffer); | |
457 | if (err) { | |
458 | JFFS2_ERROR("can not read %d bytes from 0x%08x, error code: %d.\n", len, ofs, err); | |
459 | goto free_out; | |
460 | } | |
182ec4ee | 461 | |
1e0da3cb AB |
462 | if (retlen != len) { |
463 | JFFS2_ERROR("short read at %#08x: %d instead of %d.\n", ofs, retlen, len); | |
464 | err = -EIO; | |
465 | goto free_out; | |
466 | } | |
467 | } | |
468 | ||
469 | /* Continue calculating CRC */ | |
470 | crc = crc32(tn->partial_crc, buffer, len); | |
471 | if(!pointed) | |
472 | kfree(buffer); | |
473 | #ifndef __ECOS | |
474 | else | |
475 | c->mtd->unpoint(c->mtd, buffer, ofs, len); | |
476 | #endif | |
477 | ||
478 | if (crc != tn->data_crc) { | |
39243508 | 479 | JFFS2_NOTICE("wrong data CRC in data node at 0x%08x: read %#08x, calculated %#08x.\n", |
1e0da3cb AB |
480 | ofs, tn->data_crc, crc); |
481 | return 1; | |
482 | } | |
483 | ||
484 | adj_acc: | |
485 | jeb = &c->blocks[ref->flash_offset / c->sector_size]; | |
486 | len = ref_totlen(c, jeb, ref); | |
487 | ||
182ec4ee | 488 | /* |
1e0da3cb AB |
489 | * Mark the node as having been checked and fix the |
490 | * accounting accordingly. | |
491 | */ | |
492 | spin_lock(&c->erase_completion_lock); | |
493 | jeb->used_size += len; | |
494 | jeb->unchecked_size -= len; | |
495 | c->used_size += len; | |
496 | c->unchecked_size -= len; | |
497 | spin_unlock(&c->erase_completion_lock); | |
498 | ||
1da177e4 | 499 | return 0; |
1e0da3cb AB |
500 | |
501 | free_out: | |
502 | if(!pointed) | |
503 | kfree(buffer); | |
504 | #ifndef __ECOS | |
505 | else | |
506 | c->mtd->unpoint(c->mtd, buffer, ofs, len); | |
507 | #endif | |
508 | return err; | |
1da177e4 LT |
509 | } |
510 | ||
1e0da3cb AB |
511 | /* |
512 | * Helper function for jffs2_add_older_frag_to_fragtree(). | |
513 | * | |
514 | * Checks the node if we are in the checking stage. | |
515 | */ | |
516 | static inline int check_node(struct jffs2_sb_info *c, struct jffs2_inode_info *f, struct jffs2_tmp_dnode_info *tn) | |
517 | { | |
518 | int ret; | |
182ec4ee | 519 | |
1e0da3cb AB |
520 | BUG_ON(ref_obsolete(tn->fn->raw)); |
521 | ||
522 | /* We only check the data CRC of unchecked nodes */ | |
523 | if (ref_flags(tn->fn->raw) != REF_UNCHECKED) | |
524 | return 0; | |
182ec4ee | 525 | |
733802d9 | 526 | dbg_fragtree2("check node %#04x-%#04x, phys offs %#08x.\n", |
39243508 | 527 | tn->fn->ofs, tn->fn->ofs + tn->fn->size, ref_offset(tn->fn->raw)); |
1e0da3cb AB |
528 | |
529 | ret = check_node_data(c, tn); | |
530 | if (unlikely(ret < 0)) { | |
531 | JFFS2_ERROR("check_node_data() returned error: %d.\n", | |
532 | ret); | |
533 | } else if (unlikely(ret > 0)) { | |
733802d9 | 534 | dbg_fragtree2("CRC error, mark it obsolete.\n"); |
1e0da3cb AB |
535 | jffs2_mark_node_obsolete(c, tn->fn->raw); |
536 | } | |
537 | ||
538 | return ret; | |
539 | } | |
540 | ||
182ec4ee | 541 | /* |
1e0da3cb AB |
542 | * Helper function for jffs2_add_older_frag_to_fragtree(). |
543 | * | |
544 | * Called when the new fragment that is being inserted | |
545 | * splits a hole fragment. | |
546 | */ | |
547 | static int split_hole(struct jffs2_sb_info *c, struct rb_root *root, | |
548 | struct jffs2_node_frag *newfrag, struct jffs2_node_frag *hole) | |
549 | { | |
733802d9 | 550 | dbg_fragtree2("fragment %#04x-%#04x splits the hole %#04x-%#04x\n", |
1e0da3cb AB |
551 | newfrag->ofs, newfrag->ofs + newfrag->size, hole->ofs, hole->ofs + hole->size); |
552 | ||
553 | if (hole->ofs == newfrag->ofs) { | |
182ec4ee | 554 | /* |
1e0da3cb AB |
555 | * Well, the new fragment actually starts at the same offset as |
556 | * the hole. | |
557 | */ | |
558 | if (hole->ofs + hole->size > newfrag->ofs + newfrag->size) { | |
182ec4ee | 559 | /* |
1e0da3cb AB |
560 | * We replace the overlapped left part of the hole by |
561 | * the new node. | |
562 | */ | |
182ec4ee | 563 | |
733802d9 | 564 | dbg_fragtree2("insert fragment %#04x-%#04x and cut the left part of the hole\n", |
1e0da3cb AB |
565 | newfrag->ofs, newfrag->ofs + newfrag->size); |
566 | rb_replace_node(&hole->rb, &newfrag->rb, root); | |
182ec4ee | 567 | |
1e0da3cb AB |
568 | hole->ofs += newfrag->size; |
569 | hole->size -= newfrag->size; | |
182ec4ee TG |
570 | |
571 | /* | |
1e0da3cb AB |
572 | * We know that 'hole' should be the right hand |
573 | * fragment. | |
574 | */ | |
575 | jffs2_fragtree_insert(hole, newfrag); | |
576 | rb_insert_color(&hole->rb, root); | |
577 | } else { | |
182ec4ee | 578 | /* |
1e0da3cb AB |
579 | * Ah, the new fragment is of the same size as the hole. |
580 | * Relace the hole by it. | |
581 | */ | |
733802d9 | 582 | dbg_fragtree2("insert fragment %#04x-%#04x and overwrite hole\n", |
1e0da3cb AB |
583 | newfrag->ofs, newfrag->ofs + newfrag->size); |
584 | rb_replace_node(&hole->rb, &newfrag->rb, root); | |
585 | jffs2_free_node_frag(hole); | |
586 | } | |
587 | } else { | |
588 | /* The new fragment lefts some hole space at the left */ | |
182ec4ee | 589 | |
1e0da3cb AB |
590 | struct jffs2_node_frag * newfrag2 = NULL; |
591 | ||
592 | if (hole->ofs + hole->size > newfrag->ofs + newfrag->size) { | |
593 | /* The new frag also lefts some space at the right */ | |
594 | newfrag2 = new_fragment(NULL, newfrag->ofs + | |
595 | newfrag->size, hole->ofs + hole->size | |
596 | - newfrag->ofs - newfrag->size); | |
597 | if (unlikely(!newfrag2)) { | |
598 | jffs2_free_node_frag(newfrag); | |
599 | return -ENOMEM; | |
600 | } | |
601 | } | |
602 | ||
603 | hole->size = newfrag->ofs - hole->ofs; | |
733802d9 | 604 | dbg_fragtree2("left the hole %#04x-%#04x at the left and inserd fragment %#04x-%#04x\n", |
1e0da3cb AB |
605 | hole->ofs, hole->ofs + hole->size, newfrag->ofs, newfrag->ofs + newfrag->size); |
606 | ||
607 | jffs2_fragtree_insert(newfrag, hole); | |
608 | rb_insert_color(&newfrag->rb, root); | |
182ec4ee | 609 | |
1e0da3cb | 610 | if (newfrag2) { |
733802d9 | 611 | dbg_fragtree2("left the hole %#04x-%#04x at the right\n", |
1e0da3cb AB |
612 | newfrag2->ofs, newfrag2->ofs + newfrag2->size); |
613 | jffs2_fragtree_insert(newfrag2, newfrag); | |
614 | rb_insert_color(&newfrag2->rb, root); | |
615 | } | |
616 | } | |
617 | ||
618 | return 0; | |
619 | } | |
620 | ||
621 | /* | |
622 | * This function is used when we build inode. It expects the nodes are passed | |
623 | * in the decreasing version order. The whole point of this is to improve the | |
624 | * inodes checking on NAND: we check the nodes' data CRC only when they are not | |
625 | * obsoleted. Previously, add_frag_to_fragtree() function was used and | |
626 | * nodes were passed to it in the increasing version ordes and CRCs of all | |
627 | * nodes were checked. | |
628 | * | |
629 | * Note: tn->fn->size shouldn't be zero. | |
630 | * | |
631 | * Returns 0 if the node was inserted | |
632 | * 1 if it wasn't inserted (since it is obsolete) | |
633 | * < 0 an if error occured | |
634 | */ | |
635 | int jffs2_add_older_frag_to_fragtree(struct jffs2_sb_info *c, struct jffs2_inode_info *f, | |
636 | struct jffs2_tmp_dnode_info *tn) | |
637 | { | |
638 | struct jffs2_node_frag *this, *newfrag; | |
639 | uint32_t lastend; | |
640 | struct jffs2_full_dnode *fn = tn->fn; | |
641 | struct rb_root *root = &f->fragtree; | |
642 | uint32_t fn_size = fn->size, fn_ofs = fn->ofs; | |
643 | int err, checked = 0; | |
644 | int ref_flag; | |
645 | ||
733802d9 | 646 | dbg_fragtree("insert fragment %#04x-%#04x, ver %u\n", fn_ofs, fn_ofs + fn_size, tn->version); |
1e0da3cb AB |
647 | |
648 | /* Skip all the nodes which are completed before this one starts */ | |
649 | this = jffs2_lookup_node_frag(root, fn_ofs); | |
650 | if (this) | |
733802d9 | 651 | dbg_fragtree2("'this' found %#04x-%#04x (%s)\n", this->ofs, this->ofs + this->size, this->node ? "data" : "hole"); |
1e0da3cb AB |
652 | |
653 | if (this) | |
654 | lastend = this->ofs + this->size; | |
655 | else | |
656 | lastend = 0; | |
182ec4ee | 657 | |
1e0da3cb AB |
658 | /* Detect the preliminary type of node */ |
659 | if (fn->size >= PAGE_CACHE_SIZE) | |
660 | ref_flag = REF_PRISTINE; | |
661 | else | |
662 | ref_flag = REF_NORMAL; | |
182ec4ee | 663 | |
1e0da3cb AB |
664 | /* See if we ran off the end of the root */ |
665 | if (lastend <= fn_ofs) { | |
666 | /* We did */ | |
182ec4ee TG |
667 | |
668 | /* | |
1e0da3cb AB |
669 | * We are going to insert the new node into the |
670 | * fragment tree, so check it. | |
671 | */ | |
672 | err = check_node(c, f, tn); | |
673 | if (err != 0) | |
674 | return err; | |
675 | ||
676 | fn->frags = 1; | |
677 | ||
678 | newfrag = new_fragment(fn, fn_ofs, fn_size); | |
679 | if (unlikely(!newfrag)) | |
680 | return -ENOMEM; | |
681 | ||
682 | err = no_overlapping_node(c, root, newfrag, this, lastend); | |
683 | if (unlikely(err != 0)) { | |
684 | jffs2_free_node_frag(newfrag); | |
685 | return err; | |
686 | } | |
687 | ||
688 | goto out_ok; | |
689 | } | |
690 | ||
691 | fn->frags = 0; | |
692 | ||
693 | while (1) { | |
182ec4ee | 694 | /* |
1e0da3cb AB |
695 | * Here we have: |
696 | * fn_ofs < this->ofs + this->size && fn_ofs >= this->ofs. | |
182ec4ee | 697 | * |
1e0da3cb AB |
698 | * Remember, 'this' has higher version, any non-hole node |
699 | * which is already in the fragtree is newer then the newly | |
700 | * inserted. | |
701 | */ | |
702 | if (!this->node) { | |
182ec4ee | 703 | /* |
1e0da3cb AB |
704 | * 'this' is the hole fragment, so at least the |
705 | * beginning of the new fragment is valid. | |
706 | */ | |
182ec4ee TG |
707 | |
708 | /* | |
1e0da3cb AB |
709 | * We are going to insert the new node into the |
710 | * fragment tree, so check it. | |
711 | */ | |
712 | if (!checked) { | |
713 | err = check_node(c, f, tn); | |
714 | if (unlikely(err != 0)) | |
715 | return err; | |
716 | checked = 1; | |
717 | } | |
182ec4ee | 718 | |
1e0da3cb AB |
719 | if (this->ofs + this->size >= fn_ofs + fn_size) { |
720 | /* We split the hole on two parts */ | |
721 | ||
722 | fn->frags += 1; | |
723 | newfrag = new_fragment(fn, fn_ofs, fn_size); | |
724 | if (unlikely(!newfrag)) | |
725 | return -ENOMEM; | |
726 | ||
727 | err = split_hole(c, root, newfrag, this); | |
728 | if (unlikely(err)) | |
729 | return err; | |
730 | goto out_ok; | |
731 | } | |
732 | ||
182ec4ee | 733 | /* |
1e0da3cb AB |
734 | * The beginning of the new fragment is valid since it |
735 | * overlaps the hole node. | |
736 | */ | |
737 | ||
738 | ref_flag = REF_NORMAL; | |
739 | ||
740 | fn->frags += 1; | |
741 | newfrag = new_fragment(fn, fn_ofs, | |
742 | this->ofs + this->size - fn_ofs); | |
743 | if (unlikely(!newfrag)) | |
744 | return -ENOMEM; | |
182ec4ee | 745 | |
1e0da3cb | 746 | if (fn_ofs == this->ofs) { |
182ec4ee | 747 | /* |
1e0da3cb AB |
748 | * The new node starts at the same offset as |
749 | * the hole and supersieds the hole. | |
750 | */ | |
733802d9 | 751 | dbg_fragtree2("add the new fragment instead of hole %#04x-%#04x, refcnt %d\n", |
1e0da3cb AB |
752 | fn_ofs, fn_ofs + this->ofs + this->size - fn_ofs, fn->frags); |
753 | ||
754 | rb_replace_node(&this->rb, &newfrag->rb, root); | |
755 | jffs2_free_node_frag(this); | |
756 | } else { | |
182ec4ee | 757 | /* |
1e0da3cb AB |
758 | * The hole becomes shorter as its right part |
759 | * is supersieded by the new fragment. | |
760 | */ | |
733802d9 | 761 | dbg_fragtree2("reduce size of hole %#04x-%#04x to %#04x-%#04x\n", |
1e0da3cb | 762 | this->ofs, this->ofs + this->size, this->ofs, this->ofs + this->size - newfrag->size); |
182ec4ee | 763 | |
733802d9 | 764 | dbg_fragtree2("add new fragment %#04x-%#04x, refcnt %d\n", fn_ofs, |
1e0da3cb | 765 | fn_ofs + this->ofs + this->size - fn_ofs, fn->frags); |
182ec4ee | 766 | |
1e0da3cb AB |
767 | this->size -= newfrag->size; |
768 | jffs2_fragtree_insert(newfrag, this); | |
769 | rb_insert_color(&newfrag->rb, root); | |
770 | } | |
182ec4ee | 771 | |
1e0da3cb AB |
772 | fn_ofs += newfrag->size; |
773 | fn_size -= newfrag->size; | |
774 | this = rb_entry(rb_next(&newfrag->rb), | |
775 | struct jffs2_node_frag, rb); | |
776 | ||
733802d9 | 777 | dbg_fragtree2("switch to the next 'this' fragment: %#04x-%#04x %s\n", |
1e0da3cb AB |
778 | this->ofs, this->ofs + this->size, this->node ? "(data)" : "(hole)"); |
779 | } | |
780 | ||
182ec4ee | 781 | /* |
1e0da3cb AB |
782 | * 'This' node is not the hole so it obsoletes the new fragment |
783 | * either fully or partially. | |
784 | */ | |
785 | if (this->ofs + this->size >= fn_ofs + fn_size) { | |
786 | /* The new node is obsolete, drop it */ | |
787 | if (fn->frags == 0) { | |
733802d9 | 788 | dbg_fragtree2("%#04x-%#04x is obsolete, mark it obsolete\n", fn_ofs, fn_ofs + fn_size); |
1e0da3cb AB |
789 | ref_flag = REF_OBSOLETE; |
790 | } | |
791 | goto out_ok; | |
792 | } else { | |
793 | struct jffs2_node_frag *new_this; | |
182ec4ee | 794 | |
1e0da3cb | 795 | /* 'This' node obsoletes the beginning of the new node */ |
733802d9 | 796 | dbg_fragtree2("the beginning %#04x-%#04x is obsolete\n", fn_ofs, this->ofs + this->size); |
1e0da3cb AB |
797 | |
798 | ref_flag = REF_NORMAL; | |
182ec4ee | 799 | |
1e0da3cb AB |
800 | fn_size -= this->ofs + this->size - fn_ofs; |
801 | fn_ofs = this->ofs + this->size; | |
733802d9 | 802 | dbg_fragtree2("now considering %#04x-%#04x\n", fn_ofs, fn_ofs + fn_size); |
182ec4ee | 803 | |
1e0da3cb AB |
804 | new_this = rb_entry(rb_next(&this->rb), struct jffs2_node_frag, rb); |
805 | if (!new_this) { | |
182ec4ee | 806 | /* |
1e0da3cb AB |
807 | * There is no next fragment. Add the rest of |
808 | * the new node as the right-hand child. | |
809 | */ | |
810 | if (!checked) { | |
811 | err = check_node(c, f, tn); | |
812 | if (unlikely(err != 0)) | |
813 | return err; | |
814 | checked = 1; | |
815 | } | |
182ec4ee | 816 | |
1e0da3cb AB |
817 | fn->frags += 1; |
818 | newfrag = new_fragment(fn, fn_ofs, fn_size); | |
819 | if (unlikely(!newfrag)) | |
820 | return -ENOMEM; | |
821 | ||
733802d9 | 822 | dbg_fragtree2("there are no more fragments, insert %#04x-%#04x\n", |
1e0da3cb | 823 | newfrag->ofs, newfrag->ofs + newfrag->size); |
182ec4ee | 824 | rb_link_node(&newfrag->rb, &this->rb, &this->rb.rb_right); |
1e0da3cb AB |
825 | rb_insert_color(&newfrag->rb, root); |
826 | goto out_ok; | |
827 | } else { | |
828 | this = new_this; | |
733802d9 | 829 | dbg_fragtree2("switch to the next 'this' fragment: %#04x-%#04x %s\n", |
1e0da3cb AB |
830 | this->ofs, this->ofs + this->size, this->node ? "(data)" : "(hole)"); |
831 | } | |
832 | } | |
833 | } | |
834 | ||
835 | out_ok: | |
836 | BUG_ON(fn->size < PAGE_CACHE_SIZE && ref_flag == REF_PRISTINE); | |
837 | ||
838 | if (ref_flag == REF_OBSOLETE) { | |
733802d9 | 839 | dbg_fragtree2("the node is obsolete now\n"); |
1e0da3cb AB |
840 | /* jffs2_mark_node_obsolete() will adjust space accounting */ |
841 | jffs2_mark_node_obsolete(c, fn->raw); | |
842 | return 1; | |
843 | } | |
844 | ||
733802d9 | 845 | dbg_fragtree2("the node is \"%s\" now\n", ref_flag == REF_NORMAL ? "REF_NORMAL" : "REF_PRISTINE"); |
1e0da3cb AB |
846 | |
847 | /* Space accounting was adjusted at check_node_data() */ | |
848 | spin_lock(&c->erase_completion_lock); | |
849 | fn->raw->flash_offset = ref_offset(fn->raw) | ref_flag; | |
850 | spin_unlock(&c->erase_completion_lock); | |
851 | ||
852 | return 0; | |
853 | } | |
f97117d1 | 854 | |
1da177e4 LT |
855 | void jffs2_set_inocache_state(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic, int state) |
856 | { | |
857 | spin_lock(&c->inocache_lock); | |
858 | ic->state = state; | |
859 | wake_up(&c->inocache_wq); | |
860 | spin_unlock(&c->inocache_lock); | |
861 | } | |
862 | ||
863 | /* During mount, this needs no locking. During normal operation, its | |
864 | callers want to do other stuff while still holding the inocache_lock. | |
182ec4ee | 865 | Rather than introducing special case get_ino_cache functions or |
1da177e4 | 866 | callbacks, we just let the caller do the locking itself. */ |
182ec4ee | 867 | |
1da177e4 LT |
868 | struct jffs2_inode_cache *jffs2_get_ino_cache(struct jffs2_sb_info *c, uint32_t ino) |
869 | { | |
870 | struct jffs2_inode_cache *ret; | |
871 | ||
1da177e4 LT |
872 | ret = c->inocache_list[ino % INOCACHE_HASHSIZE]; |
873 | while (ret && ret->ino < ino) { | |
874 | ret = ret->next; | |
875 | } | |
182ec4ee | 876 | |
1da177e4 LT |
877 | if (ret && ret->ino != ino) |
878 | ret = NULL; | |
879 | ||
1da177e4 LT |
880 | return ret; |
881 | } | |
882 | ||
883 | void jffs2_add_ino_cache (struct jffs2_sb_info *c, struct jffs2_inode_cache *new) | |
884 | { | |
885 | struct jffs2_inode_cache **prev; | |
7d27c814 | 886 | |
1da177e4 | 887 | spin_lock(&c->inocache_lock); |
7d27c814 TG |
888 | if (!new->ino) |
889 | new->ino = ++c->highest_ino; | |
890 | ||
733802d9 | 891 | dbg_inocache("add %p (ino #%u)\n", new, new->ino); |
7d27c814 | 892 | |
1da177e4 LT |
893 | prev = &c->inocache_list[new->ino % INOCACHE_HASHSIZE]; |
894 | ||
895 | while ((*prev) && (*prev)->ino < new->ino) { | |
896 | prev = &(*prev)->next; | |
897 | } | |
898 | new->next = *prev; | |
899 | *prev = new; | |
900 | ||
901 | spin_unlock(&c->inocache_lock); | |
902 | } | |
903 | ||
904 | void jffs2_del_ino_cache(struct jffs2_sb_info *c, struct jffs2_inode_cache *old) | |
905 | { | |
906 | struct jffs2_inode_cache **prev; | |
e0d60137 | 907 | |
733802d9 | 908 | dbg_inocache("del %p (ino #%u)\n", old, old->ino); |
1da177e4 | 909 | spin_lock(&c->inocache_lock); |
182ec4ee | 910 | |
1da177e4 | 911 | prev = &c->inocache_list[old->ino % INOCACHE_HASHSIZE]; |
182ec4ee | 912 | |
1da177e4 LT |
913 | while ((*prev) && (*prev)->ino < old->ino) { |
914 | prev = &(*prev)->next; | |
915 | } | |
916 | if ((*prev) == old) { | |
917 | *prev = old->next; | |
918 | } | |
919 | ||
67e345d1 DW |
920 | /* Free it now unless it's in READING or CLEARING state, which |
921 | are the transitions upon read_inode() and clear_inode(). The | |
182ec4ee | 922 | rest of the time we know nobody else is looking at it, and |
67e345d1 DW |
923 | if it's held by read_inode() or clear_inode() they'll free it |
924 | for themselves. */ | |
925 | if (old->state != INO_STATE_READING && old->state != INO_STATE_CLEARING) | |
926 | jffs2_free_inode_cache(old); | |
927 | ||
1da177e4 LT |
928 | spin_unlock(&c->inocache_lock); |
929 | } | |
930 | ||
931 | void jffs2_free_ino_caches(struct jffs2_sb_info *c) | |
932 | { | |
933 | int i; | |
934 | struct jffs2_inode_cache *this, *next; | |
182ec4ee | 935 | |
1da177e4 LT |
936 | for (i=0; i<INOCACHE_HASHSIZE; i++) { |
937 | this = c->inocache_list[i]; | |
938 | while (this) { | |
939 | next = this->next; | |
1da177e4 LT |
940 | jffs2_free_inode_cache(this); |
941 | this = next; | |
942 | } | |
943 | c->inocache_list[i] = NULL; | |
944 | } | |
945 | } | |
946 | ||
947 | void jffs2_free_raw_node_refs(struct jffs2_sb_info *c) | |
948 | { | |
949 | int i; | |
950 | struct jffs2_raw_node_ref *this, *next; | |
951 | ||
952 | for (i=0; i<c->nr_blocks; i++) { | |
953 | this = c->blocks[i].first_node; | |
954 | while(this) { | |
955 | next = this->next_phys; | |
956 | jffs2_free_raw_node_ref(this); | |
957 | this = next; | |
958 | } | |
959 | c->blocks[i].first_node = c->blocks[i].last_node = NULL; | |
960 | } | |
961 | } | |
182ec4ee | 962 | |
1da177e4 LT |
963 | struct jffs2_node_frag *jffs2_lookup_node_frag(struct rb_root *fragtree, uint32_t offset) |
964 | { | |
182ec4ee | 965 | /* The common case in lookup is that there will be a node |
1da177e4 LT |
966 | which precisely matches. So we go looking for that first */ |
967 | struct rb_node *next; | |
968 | struct jffs2_node_frag *prev = NULL; | |
969 | struct jffs2_node_frag *frag = NULL; | |
970 | ||
733802d9 | 971 | dbg_fragtree2("root %p, offset %d\n", fragtree, offset); |
1da177e4 LT |
972 | |
973 | next = fragtree->rb_node; | |
974 | ||
975 | while(next) { | |
976 | frag = rb_entry(next, struct jffs2_node_frag, rb); | |
977 | ||
1da177e4 | 978 | if (frag->ofs + frag->size <= offset) { |
1da177e4 LT |
979 | /* Remember the closest smaller match on the way down */ |
980 | if (!prev || frag->ofs > prev->ofs) | |
981 | prev = frag; | |
982 | next = frag->rb.rb_right; | |
983 | } else if (frag->ofs > offset) { | |
1da177e4 LT |
984 | next = frag->rb.rb_left; |
985 | } else { | |
1da177e4 LT |
986 | return frag; |
987 | } | |
988 | } | |
989 | ||
990 | /* Exact match not found. Go back up looking at each parent, | |
991 | and return the closest smaller one */ | |
992 | ||
993 | if (prev) | |
733802d9 | 994 | dbg_fragtree2("no match. Returning frag %#04x-%#04x, closest previous\n", |
e0d60137 | 995 | prev->ofs, prev->ofs+prev->size); |
182ec4ee | 996 | else |
733802d9 | 997 | dbg_fragtree2("returning NULL, empty fragtree\n"); |
182ec4ee | 998 | |
1da177e4 LT |
999 | return prev; |
1000 | } | |
1001 | ||
1002 | /* Pass 'c' argument to indicate that nodes should be marked obsolete as | |
1003 | they're killed. */ | |
1004 | void jffs2_kill_fragtree(struct rb_root *root, struct jffs2_sb_info *c) | |
1005 | { | |
1006 | struct jffs2_node_frag *frag; | |
1007 | struct jffs2_node_frag *parent; | |
1008 | ||
1009 | if (!root->rb_node) | |
1010 | return; | |
1011 | ||
733802d9 | 1012 | dbg_fragtree("killing\n"); |
182ec4ee | 1013 | |
1da177e4 | 1014 | frag = (rb_entry(root->rb_node, struct jffs2_node_frag, rb)); |
1da177e4 LT |
1015 | while(frag) { |
1016 | if (frag->rb.rb_left) { | |
1da177e4 LT |
1017 | frag = frag_left(frag); |
1018 | continue; | |
1019 | } | |
1020 | if (frag->rb.rb_right) { | |
1da177e4 LT |
1021 | frag = frag_right(frag); |
1022 | continue; | |
1023 | } | |
1024 | ||
1da177e4 | 1025 | if (frag->node && !(--frag->node->frags)) { |
182ec4ee | 1026 | /* Not a hole, and it's the final remaining frag |
1da177e4 LT |
1027 | of this node. Free the node */ |
1028 | if (c) | |
1029 | jffs2_mark_node_obsolete(c, frag->node->raw); | |
182ec4ee | 1030 | |
1da177e4 LT |
1031 | jffs2_free_full_dnode(frag->node); |
1032 | } | |
1033 | parent = frag_parent(frag); | |
1034 | if (parent) { | |
1035 | if (frag_left(parent) == frag) | |
1036 | parent->rb.rb_left = NULL; | |
182ec4ee | 1037 | else |
1da177e4 LT |
1038 | parent->rb.rb_right = NULL; |
1039 | } | |
1040 | ||
1041 | jffs2_free_node_frag(frag); | |
1042 | frag = parent; | |
1043 | ||
1044 | cond_resched(); | |
1045 | } | |
1046 | } |