1 | /* |
---|
2 | * JFFS2 -- Journalling Flash File System, Version 2. |
---|
3 | * |
---|
4 | * Copyright © 2001-2007 Red Hat, Inc. |
---|
5 | * |
---|
6 | * Created by David Woodhouse <dwmw2@infradead.org> |
---|
7 | * |
---|
8 | * For licensing information, see the file 'LICENCE' in this directory. |
---|
9 | * |
---|
10 | */ |
---|
11 | |
---|
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
---|
13 | |
---|
14 | #include <linux/kernel.h> |
---|
15 | #include <linux/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/pagemap.h> |
---|
21 | #include "nodelist.h" |
---|
22 | |
---|
23 | static void jffs2_obsolete_node_frag(struct jffs2_sb_info *c, |
---|
24 | struct jffs2_node_frag *this); |
---|
25 | |
---|
26 | void jffs2_add_fd_to_list(struct jffs2_sb_info *c, struct jffs2_full_dirent *new, struct jffs2_full_dirent **list) |
---|
27 | { |
---|
28 | struct jffs2_full_dirent **prev = list; |
---|
29 | |
---|
30 | dbg_dentlist("add dirent \"%s\", ino #%u\n", new->name, new->ino); |
---|
31 | |
---|
32 | while ((*prev) && (*prev)->nhash <= new->nhash) { |
---|
33 | if ((*prev)->nhash == new->nhash && !strcmp((*prev)->name, new->name)) { |
---|
34 | /* Duplicate. Free one */ |
---|
35 | if (new->version < (*prev)->version) { |
---|
36 | dbg_dentlist("Eep! Marking new dirent node obsolete, old is \"%s\", ino #%u\n", |
---|
37 | (*prev)->name, (*prev)->ino); |
---|
38 | jffs2_mark_node_obsolete(c, new->raw); |
---|
39 | jffs2_free_full_dirent(new); |
---|
40 | } else { |
---|
41 | dbg_dentlist("marking old dirent \"%s\", ino #%u obsolete\n", |
---|
42 | (*prev)->name, (*prev)->ino); |
---|
43 | new->next = (*prev)->next; |
---|
44 | /* It may have been a 'placeholder' deletion dirent, |
---|
45 | if jffs2_can_mark_obsolete() (see jffs2_do_unlink()) */ |
---|
46 | if ((*prev)->raw) |
---|
47 | jffs2_mark_node_obsolete(c, ((*prev)->raw)); |
---|
48 | jffs2_free_full_dirent(*prev); |
---|
49 | *prev = new; |
---|
50 | } |
---|
51 | return; |
---|
52 | } |
---|
53 | prev = &((*prev)->next); |
---|
54 | } |
---|
55 | new->next = *prev; |
---|
56 | *prev = new; |
---|
57 | } |
---|
58 | |
---|
59 | uint32_t jffs2_truncate_fragtree(struct jffs2_sb_info *c, struct rb_root *list, uint32_t size) |
---|
60 | { |
---|
61 | struct jffs2_node_frag *frag = jffs2_lookup_node_frag(list, size); |
---|
62 | |
---|
63 | dbg_fragtree("truncating fragtree to 0x%08x bytes\n", size); |
---|
64 | |
---|
65 | /* We know frag->ofs <= size. That's what lookup does for us */ |
---|
66 | if (frag && frag->ofs != size) { |
---|
67 | if (frag->ofs+frag->size > size) { |
---|
68 | frag->size = size - frag->ofs; |
---|
69 | } |
---|
70 | frag = frag_next(frag); |
---|
71 | } |
---|
72 | while (frag && frag->ofs >= size) { |
---|
73 | struct jffs2_node_frag *next = frag_next(frag); |
---|
74 | |
---|
75 | frag_erase(frag, list); |
---|
76 | jffs2_obsolete_node_frag(c, frag); |
---|
77 | frag = next; |
---|
78 | } |
---|
79 | |
---|
80 | if (size == 0) |
---|
81 | return 0; |
---|
82 | |
---|
83 | frag = frag_last(list); |
---|
84 | |
---|
85 | /* Sanity check for truncation to longer than we started with... */ |
---|
86 | if (!frag) |
---|
87 | return 0; |
---|
88 | if (frag->ofs + frag->size < size) |
---|
89 | return frag->ofs + frag->size; |
---|
90 | |
---|
91 | /* If the last fragment starts at the RAM page boundary, it is |
---|
92 | * REF_PRISTINE irrespective of its size. */ |
---|
93 | if (frag->node && (frag->ofs & (PAGE_CACHE_SIZE - 1)) == 0) { |
---|
94 | dbg_fragtree2("marking the last fragment 0x%08x-0x%08x REF_PRISTINE.\n", |
---|
95 | frag->ofs, frag->ofs + frag->size); |
---|
96 | frag->node->raw->flash_offset = ref_offset(frag->node->raw) | REF_PRISTINE; |
---|
97 | } |
---|
98 | return size; |
---|
99 | } |
---|
100 | |
---|
101 | static void jffs2_obsolete_node_frag(struct jffs2_sb_info *c, |
---|
102 | struct jffs2_node_frag *this) |
---|
103 | { |
---|
104 | if (this->node) { |
---|
105 | this->node->frags--; |
---|
106 | if (!this->node->frags) { |
---|
107 | /* The node has no valid frags left. It's totally obsoleted */ |
---|
108 | dbg_fragtree2("marking old node @0x%08x (0x%04x-0x%04x) obsolete\n", |
---|
109 | ref_offset(this->node->raw), this->node->ofs, this->node->ofs+this->node->size); |
---|
110 | jffs2_mark_node_obsolete(c, this->node->raw); |
---|
111 | jffs2_free_full_dnode(this->node); |
---|
112 | } else { |
---|
113 | dbg_fragtree2("marking old node @0x%08x (0x%04x-0x%04x) REF_NORMAL. frags is %d\n", |
---|
114 | ref_offset(this->node->raw), this->node->ofs, this->node->ofs+this->node->size, this->node->frags); |
---|
115 | mark_ref_normal(this->node->raw); |
---|
116 | } |
---|
117 | |
---|
118 | } |
---|
119 | jffs2_free_node_frag(this); |
---|
120 | } |
---|
121 | |
---|
122 | static void jffs2_fragtree_insert(struct jffs2_node_frag *newfrag, struct jffs2_node_frag *base) |
---|
123 | { |
---|
124 | struct rb_node *parent = &base->rb; |
---|
125 | struct rb_node **link = &parent; |
---|
126 | |
---|
127 | dbg_fragtree2("insert frag (0x%04x-0x%04x)\n", newfrag->ofs, newfrag->ofs + newfrag->size); |
---|
128 | |
---|
129 | while (*link) { |
---|
130 | parent = *link; |
---|
131 | base = rb_entry(parent, struct jffs2_node_frag, rb); |
---|
132 | |
---|
133 | if (newfrag->ofs > base->ofs) |
---|
134 | link = &base->rb.rb_right; |
---|
135 | else if (newfrag->ofs < base->ofs) |
---|
136 | link = &base->rb.rb_left; |
---|
137 | else { |
---|
138 | JFFS2_ERROR("duplicate frag at %08x (%p,%p)\n", newfrag->ofs, newfrag, base); |
---|
139 | BUG(); |
---|
140 | } |
---|
141 | } |
---|
142 | |
---|
143 | rb_link_node(&newfrag->rb, &base->rb, link); |
---|
144 | } |
---|
145 | |
---|
146 | /* |
---|
147 | * Allocate and initializes a new fragment. |
---|
148 | */ |
---|
149 | static struct jffs2_node_frag * new_fragment(struct jffs2_full_dnode *fn, uint32_t ofs, uint32_t size) |
---|
150 | { |
---|
151 | struct jffs2_node_frag *newfrag; |
---|
152 | |
---|
153 | newfrag = jffs2_alloc_node_frag(); |
---|
154 | if (likely(newfrag)) { |
---|
155 | newfrag->ofs = ofs; |
---|
156 | newfrag->size = size; |
---|
157 | newfrag->node = fn; |
---|
158 | } else { |
---|
159 | JFFS2_ERROR("cannot allocate a jffs2_node_frag object\n"); |
---|
160 | } |
---|
161 | |
---|
162 | return newfrag; |
---|
163 | } |
---|
164 | |
---|
165 | /* |
---|
166 | * Called when there is no overlapping fragment exist. Inserts a hole before the new |
---|
167 | * fragment and inserts the new fragment to the fragtree. |
---|
168 | */ |
---|
169 | static int no_overlapping_node(struct jffs2_sb_info *c, struct rb_root *root, |
---|
170 | struct jffs2_node_frag *newfrag, |
---|
171 | struct jffs2_node_frag *this, uint32_t lastend) |
---|
172 | { |
---|
173 | if (lastend < newfrag->node->ofs) { |
---|
174 | /* put a hole in before the new fragment */ |
---|
175 | struct jffs2_node_frag *holefrag; |
---|
176 | |
---|
177 | holefrag= new_fragment(NULL, lastend, newfrag->node->ofs - lastend); |
---|
178 | if (unlikely(!holefrag)) { |
---|
179 | jffs2_free_node_frag(newfrag); |
---|
180 | return -ENOMEM; |
---|
181 | } |
---|
182 | |
---|
183 | if (this) { |
---|
184 | /* By definition, the 'this' node has no right-hand child, |
---|
185 | because there are no frags with offset greater than it. |
---|
186 | So that's where we want to put the hole */ |
---|
187 | dbg_fragtree2("add hole frag %#04x-%#04x on the right of the new frag.\n", |
---|
188 | holefrag->ofs, holefrag->ofs + holefrag->size); |
---|
189 | rb_link_node(&holefrag->rb, &this->rb, &this->rb.rb_right); |
---|
190 | } else { |
---|
191 | dbg_fragtree2("Add hole frag %#04x-%#04x to the root of the tree.\n", |
---|
192 | holefrag->ofs, holefrag->ofs + holefrag->size); |
---|
193 | rb_link_node(&holefrag->rb, NULL, &root->rb_node); |
---|
194 | } |
---|
195 | rb_insert_color(&holefrag->rb, root); |
---|
196 | this = holefrag; |
---|
197 | } |
---|
198 | |
---|
199 | if (this) { |
---|
200 | /* By definition, the 'this' node has no right-hand child, |
---|
201 | because there are no frags with offset greater than it. |
---|
202 | So that's where we want to put new fragment */ |
---|
203 | dbg_fragtree2("add the new node at the right\n"); |
---|
204 | rb_link_node(&newfrag->rb, &this->rb, &this->rb.rb_right); |
---|
205 | } else { |
---|
206 | dbg_fragtree2("insert the new node at the root of the tree\n"); |
---|
207 | rb_link_node(&newfrag->rb, NULL, &root->rb_node); |
---|
208 | } |
---|
209 | rb_insert_color(&newfrag->rb, root); |
---|
210 | |
---|
211 | return 0; |
---|
212 | } |
---|
213 | |
---|
214 | /* Doesn't set inode->i_size */ |
---|
215 | static int jffs2_add_frag_to_fragtree(struct jffs2_sb_info *c, struct rb_root *root, struct jffs2_node_frag *newfrag) |
---|
216 | { |
---|
217 | struct jffs2_node_frag *this; |
---|
218 | uint32_t lastend; |
---|
219 | |
---|
220 | /* Skip all the nodes which are completed before this one starts */ |
---|
221 | this = jffs2_lookup_node_frag(root, newfrag->node->ofs); |
---|
222 | |
---|
223 | if (this) { |
---|
224 | dbg_fragtree2("lookup gave frag 0x%04x-0x%04x; phys 0x%08x (*%p)\n", |
---|
225 | this->ofs, this->ofs+this->size, this->node?(ref_offset(this->node->raw)):0xffffffff, this); |
---|
226 | lastend = this->ofs + this->size; |
---|
227 | } else { |
---|
228 | dbg_fragtree2("lookup gave no frag\n"); |
---|
229 | lastend = 0; |
---|
230 | } |
---|
231 | |
---|
232 | /* See if we ran off the end of the fragtree */ |
---|
233 | if (lastend <= newfrag->ofs) { |
---|
234 | /* We did */ |
---|
235 | |
---|
236 | /* Check if 'this' node was on the same page as the new node. |
---|
237 | If so, both 'this' and the new node get marked REF_NORMAL so |
---|
238 | the GC can take a look. |
---|
239 | */ |
---|
240 | if (lastend && (lastend-1) >> PAGE_CACHE_SHIFT == newfrag->ofs >> PAGE_CACHE_SHIFT) { |
---|
241 | if (this->node) |
---|
242 | mark_ref_normal(this->node->raw); |
---|
243 | mark_ref_normal(newfrag->node->raw); |
---|
244 | } |
---|
245 | |
---|
246 | return no_overlapping_node(c, root, newfrag, this, lastend); |
---|
247 | } |
---|
248 | |
---|
249 | if (this->node) |
---|
250 | dbg_fragtree2("dealing with frag %u-%u, phys %#08x(%d).\n", |
---|
251 | this->ofs, this->ofs + this->size, |
---|
252 | ref_offset(this->node->raw), ref_flags(this->node->raw)); |
---|
253 | else |
---|
254 | dbg_fragtree2("dealing with hole frag %u-%u.\n", |
---|
255 | this->ofs, this->ofs + this->size); |
---|
256 | |
---|
257 | /* OK. 'this' is pointing at the first frag that newfrag->ofs at least partially obsoletes, |
---|
258 | * - i.e. newfrag->ofs < this->ofs+this->size && newfrag->ofs >= this->ofs |
---|
259 | */ |
---|
260 | if (newfrag->ofs > this->ofs) { |
---|
261 | /* This node isn't completely obsoleted. The start of it remains valid */ |
---|
262 | |
---|
263 | /* Mark the new node and the partially covered node REF_NORMAL -- let |
---|
264 | the GC take a look at them */ |
---|
265 | mark_ref_normal(newfrag->node->raw); |
---|
266 | if (this->node) |
---|
267 | mark_ref_normal(this->node->raw); |
---|
268 | |
---|
269 | if (this->ofs + this->size > newfrag->ofs + newfrag->size) { |
---|
270 | /* The new node splits 'this' frag into two */ |
---|
271 | struct jffs2_node_frag *newfrag2; |
---|
272 | |
---|
273 | if (this->node) |
---|
274 | dbg_fragtree2("split old frag 0x%04x-0x%04x, phys 0x%08x\n", |
---|
275 | this->ofs, this->ofs+this->size, ref_offset(this->node->raw)); |
---|
276 | else |
---|
277 | dbg_fragtree2("split old hole frag 0x%04x-0x%04x\n", |
---|
278 | this->ofs, this->ofs+this->size); |
---|
279 | |
---|
280 | /* New second frag pointing to this's node */ |
---|
281 | newfrag2 = new_fragment(this->node, newfrag->ofs + newfrag->size, |
---|
282 | this->ofs + this->size - newfrag->ofs - newfrag->size); |
---|
283 | if (unlikely(!newfrag2)) |
---|
284 | return -ENOMEM; |
---|
285 | if (this->node) |
---|
286 | this->node->frags++; |
---|
287 | |
---|
288 | /* Adjust size of original 'this' */ |
---|
289 | this->size = newfrag->ofs - this->ofs; |
---|
290 | |
---|
291 | /* Now, we know there's no node with offset |
---|
292 | greater than this->ofs but smaller than |
---|
293 | newfrag2->ofs or newfrag->ofs, for obvious |
---|
294 | reasons. So we can do a tree insert from |
---|
295 | 'this' to insert newfrag, and a tree insert |
---|
296 | from newfrag to insert newfrag2. */ |
---|
297 | jffs2_fragtree_insert(newfrag, this); |
---|
298 | rb_insert_color(&newfrag->rb, root); |
---|
299 | |
---|
300 | jffs2_fragtree_insert(newfrag2, newfrag); |
---|
301 | rb_insert_color(&newfrag2->rb, root); |
---|
302 | |
---|
303 | return 0; |
---|
304 | } |
---|
305 | /* New node just reduces 'this' frag in size, doesn't split it */ |
---|
306 | this->size = newfrag->ofs - this->ofs; |
---|
307 | |
---|
308 | /* Again, we know it lives down here in the tree */ |
---|
309 | jffs2_fragtree_insert(newfrag, this); |
---|
310 | rb_insert_color(&newfrag->rb, root); |
---|
311 | } else { |
---|
312 | /* New frag starts at the same point as 'this' used to. Replace |
---|
313 | it in the tree without doing a delete and insertion */ |
---|
314 | dbg_fragtree2("inserting newfrag (*%p),%d-%d in before 'this' (*%p),%d-%d\n", |
---|
315 | newfrag, newfrag->ofs, newfrag->ofs+newfrag->size, this, this->ofs, this->ofs+this->size); |
---|
316 | |
---|
317 | rb_replace_node(&this->rb, &newfrag->rb, root); |
---|
318 | |
---|
319 | if (newfrag->ofs + newfrag->size >= this->ofs+this->size) { |
---|
320 | dbg_fragtree2("obsoleting node frag %p (%x-%x)\n", this, this->ofs, this->ofs+this->size); |
---|
321 | jffs2_obsolete_node_frag(c, this); |
---|
322 | } else { |
---|
323 | this->ofs += newfrag->size; |
---|
324 | this->size -= newfrag->size; |
---|
325 | |
---|
326 | jffs2_fragtree_insert(this, newfrag); |
---|
327 | rb_insert_color(&this->rb, root); |
---|
328 | return 0; |
---|
329 | } |
---|
330 | } |
---|
331 | /* OK, now we have newfrag added in the correct place in the tree, but |
---|
332 | frag_next(newfrag) may be a fragment which is overlapped by it |
---|
333 | */ |
---|
334 | while ((this = frag_next(newfrag)) && newfrag->ofs + newfrag->size >= this->ofs + this->size) { |
---|
335 | /* 'this' frag is obsoleted completely. */ |
---|
336 | dbg_fragtree2("obsoleting node frag %p (%x-%x) and removing from tree\n", |
---|
337 | this, this->ofs, this->ofs+this->size); |
---|
338 | rb_erase(&this->rb, root); |
---|
339 | jffs2_obsolete_node_frag(c, this); |
---|
340 | } |
---|
341 | /* Now we're pointing at the first frag which isn't totally obsoleted by |
---|
342 | the new frag */ |
---|
343 | |
---|
344 | if (!this || newfrag->ofs + newfrag->size == this->ofs) |
---|
345 | return 0; |
---|
346 | |
---|
347 | /* Still some overlap but we don't need to move it in the tree */ |
---|
348 | this->size = (this->ofs + this->size) - (newfrag->ofs + newfrag->size); |
---|
349 | this->ofs = newfrag->ofs + newfrag->size; |
---|
350 | |
---|
351 | /* And mark them REF_NORMAL so the GC takes a look at them */ |
---|
352 | if (this->node) |
---|
353 | mark_ref_normal(this->node->raw); |
---|
354 | mark_ref_normal(newfrag->node->raw); |
---|
355 | |
---|
356 | return 0; |
---|
357 | } |
---|
358 | |
---|
359 | /* |
---|
360 | * Given an inode, probably with existing tree of fragments, add the new node |
---|
361 | * to the fragment tree. |
---|
362 | */ |
---|
363 | int jffs2_add_full_dnode_to_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, struct jffs2_full_dnode *fn) |
---|
364 | { |
---|
365 | int ret; |
---|
366 | struct jffs2_node_frag *newfrag; |
---|
367 | |
---|
368 | if (unlikely(!fn->size)) |
---|
369 | return 0; |
---|
370 | |
---|
371 | newfrag = new_fragment(fn, fn->ofs, fn->size); |
---|
372 | if (unlikely(!newfrag)) |
---|
373 | return -ENOMEM; |
---|
374 | newfrag->node->frags = 1; |
---|
375 | |
---|
376 | dbg_fragtree("adding node %#04x-%#04x @0x%08x on flash, newfrag *%p\n", |
---|
377 | fn->ofs, fn->ofs+fn->size, ref_offset(fn->raw), newfrag); |
---|
378 | |
---|
379 | ret = jffs2_add_frag_to_fragtree(c, &f->fragtree, newfrag); |
---|
380 | if (unlikely(ret)) |
---|
381 | return ret; |
---|
382 | |
---|
383 | /* If we now share a page with other nodes, mark either previous |
---|
384 | or next node REF_NORMAL, as appropriate. */ |
---|
385 | if (newfrag->ofs & (PAGE_CACHE_SIZE-1)) { |
---|
386 | struct jffs2_node_frag *prev = frag_prev(newfrag); |
---|
387 | |
---|
388 | mark_ref_normal(fn->raw); |
---|
389 | /* If we don't start at zero there's _always_ a previous */ |
---|
390 | if (prev->node) |
---|
391 | mark_ref_normal(prev->node->raw); |
---|
392 | } |
---|
393 | |
---|
394 | if ((newfrag->ofs+newfrag->size) & (PAGE_CACHE_SIZE-1)) { |
---|
395 | struct jffs2_node_frag *next = frag_next(newfrag); |
---|
396 | |
---|
397 | if (next) { |
---|
398 | mark_ref_normal(fn->raw); |
---|
399 | if (next->node) |
---|
400 | mark_ref_normal(next->node->raw); |
---|
401 | } |
---|
402 | } |
---|
403 | jffs2_dbg_fragtree_paranoia_check_nolock(f); |
---|
404 | |
---|
405 | return 0; |
---|
406 | } |
---|
407 | |
---|
408 | void jffs2_set_inocache_state(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic, int state) |
---|
409 | { |
---|
410 | spin_lock(&c->inocache_lock); |
---|
411 | ic->state = state; |
---|
412 | wake_up(&c->inocache_wq); |
---|
413 | spin_unlock(&c->inocache_lock); |
---|
414 | } |
---|
415 | |
---|
416 | /* During mount, this needs no locking. During normal operation, its |
---|
417 | callers want to do other stuff while still holding the inocache_lock. |
---|
418 | Rather than introducing special case get_ino_cache functions or |
---|
419 | callbacks, we just let the caller do the locking itself. */ |
---|
420 | |
---|
421 | struct jffs2_inode_cache *jffs2_get_ino_cache(struct jffs2_sb_info *c, uint32_t ino) |
---|
422 | { |
---|
423 | struct jffs2_inode_cache *ret; |
---|
424 | |
---|
425 | ret = c->inocache_list[ino % c->inocache_hashsize]; |
---|
426 | while (ret && ret->ino < ino) { |
---|
427 | ret = ret->next; |
---|
428 | } |
---|
429 | |
---|
430 | if (ret && ret->ino != ino) |
---|
431 | ret = NULL; |
---|
432 | |
---|
433 | return ret; |
---|
434 | } |
---|
435 | |
---|
436 | void jffs2_add_ino_cache (struct jffs2_sb_info *c, struct jffs2_inode_cache *new) |
---|
437 | { |
---|
438 | struct jffs2_inode_cache **prev; |
---|
439 | |
---|
440 | spin_lock(&c->inocache_lock); |
---|
441 | if (!new->ino) |
---|
442 | new->ino = ++c->highest_ino; |
---|
443 | |
---|
444 | dbg_inocache("add %p (ino #%u)\n", new, new->ino); |
---|
445 | |
---|
446 | prev = &c->inocache_list[new->ino % c->inocache_hashsize]; |
---|
447 | |
---|
448 | while ((*prev) && (*prev)->ino < new->ino) { |
---|
449 | prev = &(*prev)->next; |
---|
450 | } |
---|
451 | new->next = *prev; |
---|
452 | *prev = new; |
---|
453 | |
---|
454 | spin_unlock(&c->inocache_lock); |
---|
455 | } |
---|
456 | |
---|
457 | void jffs2_del_ino_cache(struct jffs2_sb_info *c, struct jffs2_inode_cache *old) |
---|
458 | { |
---|
459 | struct jffs2_inode_cache **prev; |
---|
460 | |
---|
461 | #ifdef CONFIG_JFFS2_FS_XATTR |
---|
462 | BUG_ON(old->xref); |
---|
463 | #endif |
---|
464 | dbg_inocache("del %p (ino #%u)\n", old, old->ino); |
---|
465 | spin_lock(&c->inocache_lock); |
---|
466 | |
---|
467 | prev = &c->inocache_list[old->ino % c->inocache_hashsize]; |
---|
468 | |
---|
469 | while ((*prev) && (*prev)->ino < old->ino) { |
---|
470 | prev = &(*prev)->next; |
---|
471 | } |
---|
472 | if ((*prev) == old) { |
---|
473 | *prev = old->next; |
---|
474 | } |
---|
475 | |
---|
476 | /* Free it now unless it's in READING or CLEARING state, which |
---|
477 | are the transitions upon read_inode() and clear_inode(). The |
---|
478 | rest of the time we know nobody else is looking at it, and |
---|
479 | if it's held by read_inode() or clear_inode() they'll free it |
---|
480 | for themselves. */ |
---|
481 | if (old->state != INO_STATE_READING && old->state != INO_STATE_CLEARING) |
---|
482 | jffs2_free_inode_cache(old); |
---|
483 | |
---|
484 | spin_unlock(&c->inocache_lock); |
---|
485 | } |
---|
486 | |
---|
487 | void jffs2_free_ino_caches(struct jffs2_sb_info *c) |
---|
488 | { |
---|
489 | int i; |
---|
490 | struct jffs2_inode_cache *this, *next; |
---|
491 | |
---|
492 | for (i=0; i < c->inocache_hashsize; i++) { |
---|
493 | this = c->inocache_list[i]; |
---|
494 | while (this) { |
---|
495 | next = this->next; |
---|
496 | jffs2_xattr_free_inode(c, this); |
---|
497 | jffs2_free_inode_cache(this); |
---|
498 | this = next; |
---|
499 | } |
---|
500 | c->inocache_list[i] = NULL; |
---|
501 | } |
---|
502 | } |
---|
503 | |
---|
504 | void jffs2_free_raw_node_refs(struct jffs2_sb_info *c) |
---|
505 | { |
---|
506 | int i; |
---|
507 | struct jffs2_raw_node_ref *this, *next; |
---|
508 | |
---|
509 | for (i=0; i<c->nr_blocks; i++) { |
---|
510 | this = c->blocks[i].first_node; |
---|
511 | while (this) { |
---|
512 | if (this[REFS_PER_BLOCK].flash_offset == REF_LINK_NODE) |
---|
513 | next = this[REFS_PER_BLOCK].next_in_ino; |
---|
514 | else |
---|
515 | next = NULL; |
---|
516 | |
---|
517 | jffs2_free_refblock(this); |
---|
518 | this = next; |
---|
519 | } |
---|
520 | c->blocks[i].first_node = c->blocks[i].last_node = NULL; |
---|
521 | } |
---|
522 | } |
---|
523 | |
---|
524 | struct jffs2_node_frag *jffs2_lookup_node_frag(struct rb_root *fragtree, uint32_t offset) |
---|
525 | { |
---|
526 | /* The common case in lookup is that there will be a node |
---|
527 | which precisely matches. So we go looking for that first */ |
---|
528 | struct rb_node *next; |
---|
529 | struct jffs2_node_frag *prev = NULL; |
---|
530 | struct jffs2_node_frag *frag = NULL; |
---|
531 | |
---|
532 | dbg_fragtree2("root %p, offset %d\n", fragtree, offset); |
---|
533 | |
---|
534 | next = fragtree->rb_node; |
---|
535 | |
---|
536 | while(next) { |
---|
537 | frag = rb_entry(next, struct jffs2_node_frag, rb); |
---|
538 | |
---|
539 | if (frag->ofs + frag->size <= offset) { |
---|
540 | /* Remember the closest smaller match on the way down */ |
---|
541 | if (!prev || frag->ofs > prev->ofs) |
---|
542 | prev = frag; |
---|
543 | next = frag->rb.rb_right; |
---|
544 | } else if (frag->ofs > offset) { |
---|
545 | next = frag->rb.rb_left; |
---|
546 | } else { |
---|
547 | return frag; |
---|
548 | } |
---|
549 | } |
---|
550 | |
---|
551 | /* Exact match not found. Go back up looking at each parent, |
---|
552 | and return the closest smaller one */ |
---|
553 | |
---|
554 | if (prev) |
---|
555 | dbg_fragtree2("no match. Returning frag %#04x-%#04x, closest previous\n", |
---|
556 | prev->ofs, prev->ofs+prev->size); |
---|
557 | else |
---|
558 | dbg_fragtree2("returning NULL, empty fragtree\n"); |
---|
559 | |
---|
560 | return prev; |
---|
561 | } |
---|
562 | |
---|
563 | /* Pass 'c' argument to indicate that nodes should be marked obsolete as |
---|
564 | they're killed. */ |
---|
565 | void jffs2_kill_fragtree(struct rb_root *root, struct jffs2_sb_info *c) |
---|
566 | { |
---|
567 | struct jffs2_node_frag *frag; |
---|
568 | struct jffs2_node_frag *parent; |
---|
569 | |
---|
570 | if (!root->rb_node) |
---|
571 | return; |
---|
572 | |
---|
573 | dbg_fragtree("killing\n"); |
---|
574 | |
---|
575 | frag = (rb_entry(root->rb_node, struct jffs2_node_frag, rb)); |
---|
576 | while(frag) { |
---|
577 | if (frag->rb.rb_left) { |
---|
578 | frag = frag_left(frag); |
---|
579 | continue; |
---|
580 | } |
---|
581 | if (frag->rb.rb_right) { |
---|
582 | frag = frag_right(frag); |
---|
583 | continue; |
---|
584 | } |
---|
585 | |
---|
586 | if (frag->node && !(--frag->node->frags)) { |
---|
587 | /* Not a hole, and it's the final remaining frag |
---|
588 | of this node. Free the node */ |
---|
589 | if (c) |
---|
590 | jffs2_mark_node_obsolete(c, frag->node->raw); |
---|
591 | |
---|
592 | jffs2_free_full_dnode(frag->node); |
---|
593 | } |
---|
594 | parent = frag_parent(frag); |
---|
595 | if (parent) { |
---|
596 | if (frag_left(parent) == frag) |
---|
597 | parent->rb.rb_left = NULL; |
---|
598 | else |
---|
599 | parent->rb.rb_right = NULL; |
---|
600 | } |
---|
601 | |
---|
602 | jffs2_free_node_frag(frag); |
---|
603 | frag = parent; |
---|
604 | |
---|
605 | cond_resched(); |
---|
606 | } |
---|
607 | } |
---|
608 | |
---|
609 | struct jffs2_raw_node_ref *jffs2_link_node_ref(struct jffs2_sb_info *c, |
---|
610 | struct jffs2_eraseblock *jeb, |
---|
611 | uint32_t ofs, uint32_t len, |
---|
612 | struct jffs2_inode_cache *ic) |
---|
613 | { |
---|
614 | struct jffs2_raw_node_ref *ref; |
---|
615 | |
---|
616 | BUG_ON(!jeb->allocated_refs); |
---|
617 | jeb->allocated_refs--; |
---|
618 | |
---|
619 | ref = jeb->last_node; |
---|
620 | |
---|
621 | dbg_noderef("Last node at %p is (%08x,%p)\n", ref, ref->flash_offset, |
---|
622 | ref->next_in_ino); |
---|
623 | |
---|
624 | while (ref->flash_offset != REF_EMPTY_NODE) { |
---|
625 | if (ref->flash_offset == REF_LINK_NODE) |
---|
626 | ref = ref->next_in_ino; |
---|
627 | else |
---|
628 | ref++; |
---|
629 | } |
---|
630 | |
---|
631 | dbg_noderef("New ref is %p (%08x becomes %08x,%p) len 0x%x\n", ref, |
---|
632 | ref->flash_offset, ofs, ref->next_in_ino, len); |
---|
633 | |
---|
634 | ref->flash_offset = ofs; |
---|
635 | |
---|
636 | if (!jeb->first_node) { |
---|
637 | jeb->first_node = ref; |
---|
638 | BUG_ON(ref_offset(ref) != jeb->offset); |
---|
639 | } else if (unlikely(ref_offset(ref) != jeb->offset + c->sector_size - jeb->free_size)) { |
---|
640 | uint32_t last_len = ref_totlen(c, jeb, jeb->last_node); |
---|
641 | |
---|
642 | JFFS2_ERROR("Adding new ref %p at (0x%08x-0x%08x) not immediately after previous (0x%08x-0x%08x)\n", |
---|
643 | ref, ref_offset(ref), ref_offset(ref)+len, |
---|
644 | ref_offset(jeb->last_node), |
---|
645 | ref_offset(jeb->last_node)+last_len); |
---|
646 | BUG(); |
---|
647 | } |
---|
648 | jeb->last_node = ref; |
---|
649 | |
---|
650 | if (ic) { |
---|
651 | ref->next_in_ino = ic->nodes; |
---|
652 | ic->nodes = ref; |
---|
653 | } else { |
---|
654 | ref->next_in_ino = NULL; |
---|
655 | } |
---|
656 | |
---|
657 | switch(ref_flags(ref)) { |
---|
658 | case REF_UNCHECKED: |
---|
659 | c->unchecked_size += len; |
---|
660 | jeb->unchecked_size += len; |
---|
661 | break; |
---|
662 | |
---|
663 | case REF_NORMAL: |
---|
664 | case REF_PRISTINE: |
---|
665 | c->used_size += len; |
---|
666 | jeb->used_size += len; |
---|
667 | break; |
---|
668 | |
---|
669 | case REF_OBSOLETE: |
---|
670 | c->dirty_size += len; |
---|
671 | jeb->dirty_size += len; |
---|
672 | break; |
---|
673 | } |
---|
674 | c->free_size -= len; |
---|
675 | jeb->free_size -= len; |
---|
676 | |
---|
677 | #ifdef TEST_TOTLEN |
---|
678 | /* Set (and test) __totlen field... for now */ |
---|
679 | ref->__totlen = len; |
---|
680 | ref_totlen(c, jeb, ref); |
---|
681 | #endif |
---|
682 | return ref; |
---|
683 | } |
---|
684 | |
---|
685 | /* No locking, no reservation of 'ref'. Do not use on a live file system */ |
---|
686 | int jffs2_scan_dirty_space(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, |
---|
687 | uint32_t size) |
---|
688 | { |
---|
689 | if (!size) |
---|
690 | return 0; |
---|
691 | if (unlikely(size > jeb->free_size)) { |
---|
692 | pr_crit("Dirty space 0x%x larger then free_size 0x%x (wasted 0x%x)\n", |
---|
693 | size, jeb->free_size, jeb->wasted_size); |
---|
694 | BUG(); |
---|
695 | } |
---|
696 | /* REF_EMPTY_NODE is !obsolete, so that works OK */ |
---|
697 | if (jeb->last_node && ref_obsolete(jeb->last_node)) { |
---|
698 | #ifdef TEST_TOTLEN |
---|
699 | jeb->last_node->__totlen += size; |
---|
700 | #endif |
---|
701 | c->dirty_size += size; |
---|
702 | c->free_size -= size; |
---|
703 | jeb->dirty_size += size; |
---|
704 | jeb->free_size -= size; |
---|
705 | } else { |
---|
706 | uint32_t ofs = jeb->offset + c->sector_size - jeb->free_size; |
---|
707 | ofs |= REF_OBSOLETE; |
---|
708 | |
---|
709 | jffs2_link_node_ref(c, jeb, ofs, size, NULL); |
---|
710 | } |
---|
711 | |
---|
712 | return 0; |
---|
713 | } |
---|
714 | |
---|
715 | /* Calculate totlen from surrounding nodes or eraseblock */ |
---|
716 | static inline uint32_t __ref_totlen(struct jffs2_sb_info *c, |
---|
717 | struct jffs2_eraseblock *jeb, |
---|
718 | struct jffs2_raw_node_ref *ref) |
---|
719 | { |
---|
720 | uint32_t ref_end; |
---|
721 | struct jffs2_raw_node_ref *next_ref = ref_next(ref); |
---|
722 | |
---|
723 | if (next_ref) |
---|
724 | ref_end = ref_offset(next_ref); |
---|
725 | else { |
---|
726 | if (!jeb) |
---|
727 | jeb = &c->blocks[ref->flash_offset / c->sector_size]; |
---|
728 | |
---|
729 | /* Last node in block. Use free_space */ |
---|
730 | if (unlikely(ref != jeb->last_node)) { |
---|
731 | pr_crit("ref %p @0x%08x is not jeb->last_node (%p @0x%08x)\n", |
---|
732 | ref, ref_offset(ref), jeb->last_node, |
---|
733 | jeb->last_node ? |
---|
734 | ref_offset(jeb->last_node) : 0); |
---|
735 | BUG(); |
---|
736 | } |
---|
737 | ref_end = jeb->offset + c->sector_size - jeb->free_size; |
---|
738 | } |
---|
739 | return ref_end - ref_offset(ref); |
---|
740 | } |
---|
741 | |
---|
742 | uint32_t __jffs2_ref_totlen(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, |
---|
743 | struct jffs2_raw_node_ref *ref) |
---|
744 | { |
---|
745 | uint32_t ret; |
---|
746 | |
---|
747 | ret = __ref_totlen(c, jeb, ref); |
---|
748 | |
---|
749 | #ifdef TEST_TOTLEN |
---|
750 | if (unlikely(ret != ref->__totlen)) { |
---|
751 | if (!jeb) |
---|
752 | jeb = &c->blocks[ref->flash_offset / c->sector_size]; |
---|
753 | |
---|
754 | pr_crit("Totlen for ref at %p (0x%08x-0x%08x) miscalculated as 0x%x instead of %x\n", |
---|
755 | ref, ref_offset(ref), ref_offset(ref) + ref->__totlen, |
---|
756 | ret, ref->__totlen); |
---|
757 | if (ref_next(ref)) { |
---|
758 | pr_crit("next %p (0x%08x-0x%08x)\n", |
---|
759 | ref_next(ref), ref_offset(ref_next(ref)), |
---|
760 | ref_offset(ref_next(ref)) + ref->__totlen); |
---|
761 | } else |
---|
762 | pr_crit("No next ref. jeb->last_node is %p\n", |
---|
763 | jeb->last_node); |
---|
764 | |
---|
765 | pr_crit("jeb->wasted_size %x, dirty_size %x, used_size %x, free_size %x\n", |
---|
766 | jeb->wasted_size, jeb->dirty_size, jeb->used_size, |
---|
767 | jeb->free_size); |
---|
768 | |
---|
769 | #if defined(JFFS2_DBG_DUMPS) || defined(JFFS2_DBG_PARANOIA_CHECKS) |
---|
770 | __jffs2_dbg_dump_node_refs_nolock(c, jeb); |
---|
771 | #endif |
---|
772 | |
---|
773 | WARN_ON(1); |
---|
774 | |
---|
775 | ret = ref->__totlen; |
---|
776 | } |
---|
777 | #endif /* TEST_TOTLEN */ |
---|
778 | return ret; |
---|
779 | } |
---|