Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * JFFS2 -- Journalling Flash File System, Version 2. | |
3 | * | |
c00c310e | 4 | * Copyright © 2001-2007 Red Hat, Inc. |
1da177e4 LT |
5 | * |
6 | * Created by David Woodhouse <dwmw2@infradead.org> | |
7 | * | |
8 | * For licensing information, see the file 'LICENCE' in this directory. | |
9 | * | |
1da177e4 | 10 | */ |
5a528957 JP |
11 | |
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
1da177e4 LT |
13 | |
14 | #include <linux/kernel.h> | |
737b7661 | 15 | #include <linux/sched.h> |
1da177e4 LT |
16 | #include <linux/slab.h> |
17 | #include <linux/fs.h> | |
18 | #include <linux/crc32.h> | |
19 | #include <linux/pagemap.h> | |
20 | #include <linux/mtd/mtd.h> | |
21 | #include <linux/compiler.h> | |
22 | #include "nodelist.h" | |
23 | ||
1e0da3cb | 24 | /* |
df8e96f3 DW |
25 | * Check the data CRC of the node. |
26 | * | |
27 | * Returns: 0 if the data CRC is correct; | |
28 | * 1 - if incorrect; | |
25985edc | 29 | * error code if an error occurred. |
df8e96f3 DW |
30 | */ |
31 | static int check_node_data(struct jffs2_sb_info *c, struct jffs2_tmp_dnode_info *tn) | |
32 | { | |
33 | struct jffs2_raw_node_ref *ref = tn->fn->raw; | |
34 | int err = 0, pointed = 0; | |
35 | struct jffs2_eraseblock *jeb; | |
36 | unsigned char *buffer; | |
37 | uint32_t crc, ofs, len; | |
38 | size_t retlen; | |
39 | ||
40 | BUG_ON(tn->csize == 0); | |
41 | ||
df8e96f3 DW |
42 | /* Calculate how many bytes were already checked */ |
43 | ofs = ref_offset(ref) + sizeof(struct jffs2_raw_inode); | |
92525726 | 44 | len = tn->csize; |
df8e96f3 | 45 | |
92525726 DW |
46 | if (jffs2_is_writebuffered(c)) { |
47 | int adj = ofs % c->wbuf_pagesize; | |
48 | if (likely(adj)) | |
49 | adj = c->wbuf_pagesize - adj; | |
df8e96f3 | 50 | |
92525726 DW |
51 | if (adj >= tn->csize) { |
52 | dbg_readinode("no need to check node at %#08x, data length %u, data starts at %#08x - it has already been checked.\n", | |
53 | ref_offset(ref), tn->csize, ofs); | |
54 | goto adj_acc; | |
55 | } | |
56 | ||
57 | ofs += adj; | |
58 | len -= adj; | |
59 | } | |
df8e96f3 DW |
60 | |
61 | 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", | |
62 | ref_offset(ref), tn->csize, tn->partial_crc, tn->data_crc, ofs - len, ofs, len); | |
63 | ||
64 | #ifndef __ECOS | |
65 | /* TODO: instead, incapsulate point() stuff to jffs2_flash_read(), | |
66 | * adding and jffs2_flash_read_end() interface. */ | |
10934478 AB |
67 | err = mtd_point(c->mtd, ofs, len, &retlen, (void **)&buffer, NULL); |
68 | if (!err && retlen < len) { | |
69 | JFFS2_WARNING("MTD point returned len too short: %zu instead of %u.\n", retlen, tn->csize); | |
70 | mtd_unpoint(c->mtd, ofs, retlen); | |
71 | } else if (err) { | |
72 | if (err != -EOPNOTSUPP) | |
df8e96f3 | 73 | JFFS2_WARNING("MTD point failed: error code %d.\n", err); |
10934478 AB |
74 | } else |
75 | pointed = 1; /* succefully pointed to device */ | |
df8e96f3 DW |
76 | #endif |
77 | ||
78 | if (!pointed) { | |
79 | buffer = kmalloc(len, GFP_KERNEL); | |
80 | if (unlikely(!buffer)) | |
81 | return -ENOMEM; | |
82 | ||
83 | /* TODO: this is very frequent pattern, make it a separate | |
84 | * routine */ | |
85 | err = jffs2_flash_read(c, ofs, len, &retlen, buffer); | |
86 | if (err) { | |
87 | JFFS2_ERROR("can not read %d bytes from 0x%08x, error code: %d.\n", len, ofs, err); | |
88 | goto free_out; | |
89 | } | |
90 | ||
91 | if (retlen != len) { | |
92 | JFFS2_ERROR("short read at %#08x: %zd instead of %d.\n", ofs, retlen, len); | |
93 | err = -EIO; | |
94 | goto free_out; | |
95 | } | |
96 | } | |
97 | ||
98 | /* Continue calculating CRC */ | |
99 | crc = crc32(tn->partial_crc, buffer, len); | |
100 | if(!pointed) | |
101 | kfree(buffer); | |
102 | #ifndef __ECOS | |
103 | else | |
7219778a | 104 | mtd_unpoint(c->mtd, ofs, len); |
df8e96f3 DW |
105 | #endif |
106 | ||
107 | if (crc != tn->data_crc) { | |
108 | JFFS2_NOTICE("wrong data CRC in data node at 0x%08x: read %#08x, calculated %#08x.\n", | |
b2e25235 | 109 | ref_offset(ref), tn->data_crc, crc); |
df8e96f3 DW |
110 | return 1; |
111 | } | |
112 | ||
113 | adj_acc: | |
114 | jeb = &c->blocks[ref->flash_offset / c->sector_size]; | |
115 | len = ref_totlen(c, jeb, ref); | |
116 | /* If it should be REF_NORMAL, it'll get marked as such when | |
117 | we build the fragtree, shortly. No need to worry about GC | |
118 | moving it while it's marked REF_PRISTINE -- GC won't happen | |
119 | till we've finished checking every inode anyway. */ | |
120 | ref->flash_offset |= REF_PRISTINE; | |
121 | /* | |
122 | * Mark the node as having been checked and fix the | |
123 | * accounting accordingly. | |
124 | */ | |
125 | spin_lock(&c->erase_completion_lock); | |
126 | jeb->used_size += len; | |
127 | jeb->unchecked_size -= len; | |
128 | c->used_size += len; | |
129 | c->unchecked_size -= len; | |
130 | jffs2_dbg_acct_paranoia_check_nolock(c, jeb); | |
131 | spin_unlock(&c->erase_completion_lock); | |
132 | ||
133 | return 0; | |
134 | ||
135 | free_out: | |
136 | if(!pointed) | |
137 | kfree(buffer); | |
138 | #ifndef __ECOS | |
139 | else | |
7219778a | 140 | mtd_unpoint(c->mtd, ofs, len); |
df8e96f3 DW |
141 | #endif |
142 | return err; | |
143 | } | |
144 | ||
145 | /* | |
146 | * Helper function for jffs2_add_older_frag_to_fragtree(). | |
147 | * | |
148 | * Checks the node if we are in the checking stage. | |
149 | */ | |
150 | static int check_tn_node(struct jffs2_sb_info *c, struct jffs2_tmp_dnode_info *tn) | |
151 | { | |
152 | int ret; | |
153 | ||
154 | BUG_ON(ref_obsolete(tn->fn->raw)); | |
155 | ||
156 | /* We only check the data CRC of unchecked nodes */ | |
157 | if (ref_flags(tn->fn->raw) != REF_UNCHECKED) | |
158 | return 0; | |
159 | ||
160 | dbg_readinode("check node %#04x-%#04x, phys offs %#08x\n", | |
161 | tn->fn->ofs, tn->fn->ofs + tn->fn->size, ref_offset(tn->fn->raw)); | |
162 | ||
163 | ret = check_node_data(c, tn); | |
164 | if (unlikely(ret < 0)) { | |
165 | JFFS2_ERROR("check_node_data() returned error: %d.\n", | |
166 | ret); | |
167 | } else if (unlikely(ret > 0)) { | |
168 | dbg_readinode("CRC error, mark it obsolete.\n"); | |
169 | jffs2_mark_node_obsolete(c, tn->fn->raw); | |
170 | } | |
171 | ||
172 | return ret; | |
173 | } | |
174 | ||
175 | static struct jffs2_tmp_dnode_info *jffs2_lookup_tn(struct rb_root *tn_root, uint32_t offset) | |
176 | { | |
177 | struct rb_node *next; | |
178 | struct jffs2_tmp_dnode_info *tn = NULL; | |
179 | ||
180 | dbg_readinode("root %p, offset %d\n", tn_root, offset); | |
181 | ||
182 | next = tn_root->rb_node; | |
183 | ||
184 | while (next) { | |
185 | tn = rb_entry(next, struct jffs2_tmp_dnode_info, rb); | |
186 | ||
187 | if (tn->fn->ofs < offset) | |
188 | next = tn->rb.rb_right; | |
189 | else if (tn->fn->ofs >= offset) | |
190 | next = tn->rb.rb_left; | |
191 | else | |
192 | break; | |
193 | } | |
194 | ||
195 | return tn; | |
196 | } | |
197 | ||
198 | ||
199 | static void jffs2_kill_tn(struct jffs2_sb_info *c, struct jffs2_tmp_dnode_info *tn) | |
200 | { | |
201 | jffs2_mark_node_obsolete(c, tn->fn->raw); | |
202 | jffs2_free_full_dnode(tn->fn); | |
203 | jffs2_free_tmp_dnode_info(tn); | |
204 | } | |
205 | /* | |
206 | * This function is used when we read an inode. Data nodes arrive in | |
207 | * arbitrary order -- they may be older or newer than the nodes which | |
208 | * are already in the tree. Where overlaps occur, the older node can | |
209 | * be discarded as long as the newer passes the CRC check. We don't | |
210 | * bother to keep track of holes in this rbtree, and neither do we deal | |
211 | * with frags -- we can have multiple entries starting at the same | |
212 | * offset, and the one with the smallest length will come first in the | |
213 | * ordering. | |
214 | * | |
14c6381e | 215 | * Returns 0 if the node was handled (including marking it obsolete) |
ef53cb02 | 216 | * < 0 an if error occurred |
1da177e4 | 217 | */ |
df8e96f3 DW |
218 | static int jffs2_add_tn_to_tree(struct jffs2_sb_info *c, |
219 | struct jffs2_readinode_info *rii, | |
220 | struct jffs2_tmp_dnode_info *tn) | |
221 | { | |
222 | uint32_t fn_end = tn->fn->ofs + tn->fn->size; | |
4c41bd0e | 223 | struct jffs2_tmp_dnode_info *this, *ptn; |
df8e96f3 | 224 | |
fcf3cafb | 225 | dbg_readinode("insert fragment %#04x-%#04x, ver %u at %08x\n", tn->fn->ofs, fn_end, tn->version, ref_offset(tn->fn->raw)); |
df8e96f3 | 226 | |
4740f496 | 227 | /* If a node has zero dsize, we only have to keep it if it might be the |
df8e96f3 DW |
228 | node with highest version -- i.e. the one which will end up as f->metadata. |
229 | Note that such nodes won't be REF_UNCHECKED since there are no data to | |
230 | check anyway. */ | |
231 | if (!tn->fn->size) { | |
232 | if (rii->mdata_tn) { | |
0477d24e DW |
233 | if (rii->mdata_tn->version < tn->version) { |
234 | /* We had a candidate mdata node already */ | |
235 | dbg_readinode("kill old mdata with ver %d\n", rii->mdata_tn->version); | |
236 | jffs2_kill_tn(c, rii->mdata_tn); | |
237 | } else { | |
238 | dbg_readinode("kill new mdata with ver %d (older than existing %d\n", | |
239 | tn->version, rii->mdata_tn->version); | |
240 | jffs2_kill_tn(c, tn); | |
241 | return 0; | |
242 | } | |
df8e96f3 DW |
243 | } |
244 | rii->mdata_tn = tn; | |
245 | dbg_readinode("keep new mdata with ver %d\n", tn->version); | |
246 | return 0; | |
247 | } | |
248 | ||
249 | /* Find the earliest node which _may_ be relevant to this one */ | |
250 | this = jffs2_lookup_tn(&rii->tn_root, tn->fn->ofs); | |
1c979645 DW |
251 | if (this) { |
252 | /* If the node is coincident with another at a lower address, | |
253 | back up until the other node is found. It may be relevant */ | |
4c41bd0e TG |
254 | while (this->overlapped) { |
255 | ptn = tn_prev(this); | |
256 | if (!ptn) { | |
257 | /* | |
258 | * We killed a node which set the overlapped | |
259 | * flags during the scan. Fix it up. | |
260 | */ | |
261 | this->overlapped = 0; | |
262 | break; | |
263 | } | |
264 | this = ptn; | |
265 | } | |
1c979645 DW |
266 | dbg_readinode("'this' found %#04x-%#04x (%s)\n", this->fn->ofs, this->fn->ofs + this->fn->size, this->fn ? "data" : "hole"); |
267 | } | |
df8e96f3 DW |
268 | |
269 | while (this) { | |
270 | if (this->fn->ofs > fn_end) | |
271 | break; | |
272 | dbg_readinode("Ponder this ver %d, 0x%x-0x%x\n", | |
273 | this->version, this->fn->ofs, this->fn->size); | |
274 | ||
275 | if (this->version == tn->version) { | |
276 | /* Version number collision means REF_PRISTINE GC. Accept either of them | |
277 | as long as the CRC is correct. Check the one we have already... */ | |
278 | if (!check_tn_node(c, this)) { | |
279 | /* The one we already had was OK. Keep it and throw away the new one */ | |
280 | dbg_readinode("Like old node. Throw away new\n"); | |
281 | jffs2_kill_tn(c, tn); | |
282 | return 0; | |
283 | } else { | |
284 | /* Who cares if the new one is good; keep it for now anyway. */ | |
fcf3cafb | 285 | dbg_readinode("Like new node. Throw away old\n"); |
df8e96f3 | 286 | rb_replace_node(&this->rb, &tn->rb, &rii->tn_root); |
df8e96f3 | 287 | jffs2_kill_tn(c, this); |
fcf3cafb DW |
288 | /* Same overlapping from in front and behind */ |
289 | return 0; | |
df8e96f3 DW |
290 | } |
291 | } | |
292 | if (this->version < tn->version && | |
293 | this->fn->ofs >= tn->fn->ofs && | |
294 | this->fn->ofs + this->fn->size <= fn_end) { | |
295 | /* New node entirely overlaps 'this' */ | |
296 | if (check_tn_node(c, tn)) { | |
297 | dbg_readinode("new node bad CRC\n"); | |
298 | jffs2_kill_tn(c, tn); | |
299 | return 0; | |
300 | } | |
fcf3cafb | 301 | /* ... and is good. Kill 'this' and any subsequent nodes which are also overlapped */ |
1c979645 | 302 | while (this && this->fn->ofs + this->fn->size <= fn_end) { |
df8e96f3 DW |
303 | struct jffs2_tmp_dnode_info *next = tn_next(this); |
304 | if (this->version < tn->version) { | |
305 | tn_erase(this, &rii->tn_root); | |
306 | dbg_readinode("Kill overlapped ver %d, 0x%x-0x%x\n", | |
307 | this->version, this->fn->ofs, | |
308 | this->fn->ofs+this->fn->size); | |
309 | jffs2_kill_tn(c, this); | |
310 | } | |
311 | this = next; | |
312 | } | |
fcf3cafb | 313 | dbg_readinode("Done killing overlapped nodes\n"); |
1c979645 | 314 | continue; |
df8e96f3 DW |
315 | } |
316 | if (this->version > tn->version && | |
317 | this->fn->ofs <= tn->fn->ofs && | |
318 | this->fn->ofs+this->fn->size >= fn_end) { | |
319 | /* New node entirely overlapped by 'this' */ | |
320 | if (!check_tn_node(c, this)) { | |
321 | dbg_readinode("Good CRC on old node. Kill new\n"); | |
322 | jffs2_kill_tn(c, tn); | |
323 | return 0; | |
324 | } | |
325 | /* ... but 'this' was bad. Replace it... */ | |
df8e96f3 | 326 | dbg_readinode("Bad CRC on old overlapping node. Kill it\n"); |
fcf3cafb | 327 | tn_erase(this, &rii->tn_root); |
df8e96f3 | 328 | jffs2_kill_tn(c, this); |
fcf3cafb | 329 | break; |
df8e96f3 | 330 | } |
df8e96f3 DW |
331 | |
332 | this = tn_next(this); | |
333 | } | |
96dd8d25 | 334 | |
df8e96f3 | 335 | /* We neither completely obsoleted nor were completely |
96dd8d25 | 336 | obsoleted by an earlier node. Insert into the tree */ |
df8e96f3 | 337 | { |
96dd8d25 DW |
338 | struct rb_node *parent; |
339 | struct rb_node **link = &rii->tn_root.rb_node; | |
1c979645 | 340 | struct jffs2_tmp_dnode_info *insert_point = NULL; |
df8e96f3 DW |
341 | |
342 | while (*link) { | |
343 | parent = *link; | |
344 | insert_point = rb_entry(parent, struct jffs2_tmp_dnode_info, rb); | |
345 | if (tn->fn->ofs > insert_point->fn->ofs) | |
346 | link = &insert_point->rb.rb_right; | |
347 | else if (tn->fn->ofs < insert_point->fn->ofs || | |
348 | tn->fn->size < insert_point->fn->size) | |
349 | link = &insert_point->rb.rb_left; | |
350 | else | |
351 | link = &insert_point->rb.rb_right; | |
352 | } | |
353 | rb_link_node(&tn->rb, &insert_point->rb, link); | |
354 | rb_insert_color(&tn->rb, &rii->tn_root); | |
355 | } | |
1123e2a8 | 356 | |
df8e96f3 DW |
357 | /* If there's anything behind that overlaps us, note it */ |
358 | this = tn_prev(tn); | |
359 | if (this) { | |
360 | while (1) { | |
361 | if (this->fn->ofs + this->fn->size > tn->fn->ofs) { | |
362 | dbg_readinode("Node is overlapped by %p (v %d, 0x%x-0x%x)\n", | |
363 | this, this->version, this->fn->ofs, | |
364 | this->fn->ofs+this->fn->size); | |
365 | tn->overlapped = 1; | |
366 | break; | |
367 | } | |
368 | if (!this->overlapped) | |
369 | break; | |
4c41bd0e TG |
370 | |
371 | ptn = tn_prev(this); | |
372 | if (!ptn) { | |
373 | /* | |
374 | * We killed a node which set the overlapped | |
375 | * flags during the scan. Fix it up. | |
376 | */ | |
377 | this->overlapped = 0; | |
378 | break; | |
379 | } | |
380 | this = ptn; | |
df8e96f3 DW |
381 | } |
382 | } | |
383 | ||
384 | /* If the new node overlaps anything ahead, note it */ | |
385 | this = tn_next(tn); | |
386 | while (this && this->fn->ofs < fn_end) { | |
387 | this->overlapped = 1; | |
388 | dbg_readinode("Node ver %d, 0x%x-0x%x is overlapped\n", | |
389 | this->version, this->fn->ofs, | |
390 | this->fn->ofs+this->fn->size); | |
391 | this = tn_next(this); | |
392 | } | |
393 | return 0; | |
394 | } | |
395 | ||
396 | /* Trivial function to remove the last node in the tree. Which by definition | |
bf7ad8ee ML |
397 | has no right-hand child — so can be removed just by making its left-hand |
398 | child (if any) take its place under its parent. Since this is only done | |
399 | when we're consuming the whole tree, there's no need to use rb_erase() | |
400 | and let it worry about adjusting colours and balancing the tree. That | |
401 | would just be a waste of time. */ | |
df8e96f3 | 402 | static void eat_last(struct rb_root *root, struct rb_node *node) |
1da177e4 | 403 | { |
df8e96f3 DW |
404 | struct rb_node *parent = rb_parent(node); |
405 | struct rb_node **link; | |
406 | ||
407 | /* LAST! */ | |
408 | BUG_ON(node->rb_right); | |
409 | ||
410 | if (!parent) | |
411 | link = &root->rb_node; | |
412 | else if (node == parent->rb_left) | |
413 | link = &parent->rb_left; | |
414 | else | |
415 | link = &parent->rb_right; | |
416 | ||
417 | *link = node->rb_left; | |
df8e96f3 | 418 | if (node->rb_left) |
bf7ad8ee | 419 | node->rb_left->__rb_parent_color = node->__rb_parent_color; |
df8e96f3 DW |
420 | } |
421 | ||
bf7ad8ee ML |
422 | /* We put the version tree in reverse order, so we can use the same eat_last() |
423 | function that we use to consume the tmpnode tree (tn_root). */ | |
df8e96f3 DW |
424 | static void ver_insert(struct rb_root *ver_root, struct jffs2_tmp_dnode_info *tn) |
425 | { | |
426 | struct rb_node **link = &ver_root->rb_node; | |
427 | struct rb_node *parent = NULL; | |
428 | struct jffs2_tmp_dnode_info *this_tn; | |
429 | ||
430 | while (*link) { | |
431 | parent = *link; | |
432 | this_tn = rb_entry(parent, struct jffs2_tmp_dnode_info, rb); | |
433 | ||
434 | if (tn->version > this_tn->version) | |
435 | link = &parent->rb_left; | |
f97117d1 | 436 | else |
df8e96f3 | 437 | link = &parent->rb_right; |
1e0da3cb | 438 | } |
df8e96f3 DW |
439 | dbg_readinode("Link new node at %p (root is %p)\n", link, ver_root); |
440 | rb_link_node(&tn->rb, parent, link); | |
441 | rb_insert_color(&tn->rb, ver_root); | |
442 | } | |
f97117d1 | 443 | |
df8e96f3 DW |
444 | /* Build final, normal fragtree from tn tree. It doesn't matter which order |
445 | we add nodes to the real fragtree, as long as they don't overlap. And | |
446 | having thrown away the majority of overlapped nodes as we went, there | |
447 | really shouldn't be many sets of nodes which do overlap. If we start at | |
448 | the end, we can use the overlap markers -- we can just eat nodes which | |
449 | aren't overlapped, and when we encounter nodes which _do_ overlap we | |
450 | sort them all into a temporary tree in version order before replaying them. */ | |
451 | static int jffs2_build_inode_fragtree(struct jffs2_sb_info *c, | |
452 | struct jffs2_inode_info *f, | |
453 | struct jffs2_readinode_info *rii) | |
454 | { | |
455 | struct jffs2_tmp_dnode_info *pen, *last, *this; | |
456 | struct rb_root ver_root = RB_ROOT; | |
457 | uint32_t high_ver = 0; | |
458 | ||
459 | if (rii->mdata_tn) { | |
460 | dbg_readinode("potential mdata is ver %d at %p\n", rii->mdata_tn->version, rii->mdata_tn); | |
461 | high_ver = rii->mdata_tn->version; | |
462 | rii->latest_ref = rii->mdata_tn->fn->raw; | |
463 | } | |
464 | #ifdef JFFS2_DBG_READINODE_MESSAGES | |
465 | this = tn_last(&rii->tn_root); | |
466 | while (this) { | |
467 | dbg_readinode("tn %p ver %d range 0x%x-0x%x ov %d\n", this, this->version, this->fn->ofs, | |
96dd8d25 | 468 | this->fn->ofs+this->fn->size, this->overlapped); |
df8e96f3 DW |
469 | this = tn_prev(this); |
470 | } | |
471 | #endif | |
472 | pen = tn_last(&rii->tn_root); | |
473 | while ((last = pen)) { | |
474 | pen = tn_prev(last); | |
475 | ||
476 | eat_last(&rii->tn_root, &last->rb); | |
477 | ver_insert(&ver_root, last); | |
478 | ||
4c41bd0e TG |
479 | if (unlikely(last->overlapped)) { |
480 | if (pen) | |
481 | continue; | |
482 | /* | |
483 | * We killed a node which set the overlapped | |
484 | * flags during the scan. Fix it up. | |
485 | */ | |
486 | last->overlapped = 0; | |
487 | } | |
df8e96f3 DW |
488 | |
489 | /* Now we have a bunch of nodes in reverse version | |
490 | order, in the tree at ver_root. Most of the time, | |
491 | there'll actually be only one node in the 'tree', | |
492 | in fact. */ | |
493 | this = tn_last(&ver_root); | |
494 | ||
495 | while (this) { | |
496 | struct jffs2_tmp_dnode_info *vers_next; | |
497 | int ret; | |
498 | vers_next = tn_prev(this); | |
499 | eat_last(&ver_root, &this->rb); | |
500 | if (check_tn_node(c, this)) { | |
1123e2a8 | 501 | dbg_readinode("node ver %d, 0x%x-0x%x failed CRC\n", |
df8e96f3 DW |
502 | this->version, this->fn->ofs, |
503 | this->fn->ofs+this->fn->size); | |
504 | jffs2_kill_tn(c, this); | |
505 | } else { | |
506 | if (this->version > high_ver) { | |
507 | /* Note that this is different from the other | |
508 | highest_version, because this one is only | |
509 | counting _valid_ nodes which could give the | |
510 | latest inode metadata */ | |
511 | high_ver = this->version; | |
512 | rii->latest_ref = this->fn->raw; | |
513 | } | |
1123e2a8 | 514 | dbg_readinode("Add %p (v %d, 0x%x-0x%x, ov %d) to fragtree\n", |
df8e96f3 DW |
515 | this, this->version, this->fn->ofs, |
516 | this->fn->ofs+this->fn->size, this->overlapped); | |
517 | ||
518 | ret = jffs2_add_full_dnode_to_inode(c, f, this->fn); | |
519 | if (ret) { | |
520 | /* Free the nodes in vers_root; let the caller | |
521 | deal with the rest */ | |
522 | JFFS2_ERROR("Add node to tree failed %d\n", ret); | |
523 | while (1) { | |
524 | vers_next = tn_prev(this); | |
525 | if (check_tn_node(c, this)) | |
526 | jffs2_mark_node_obsolete(c, this->fn->raw); | |
527 | jffs2_free_full_dnode(this->fn); | |
528 | jffs2_free_tmp_dnode_info(this); | |
529 | this = vers_next; | |
530 | if (!this) | |
531 | break; | |
532 | eat_last(&ver_root, &vers_next->rb); | |
533 | } | |
534 | return ret; | |
535 | } | |
536 | jffs2_free_tmp_dnode_info(this); | |
537 | } | |
538 | this = vers_next; | |
539 | } | |
540 | } | |
541 | return 0; | |
f97117d1 | 542 | } |
1da177e4 | 543 | |
f97117d1 AB |
544 | static void jffs2_free_tmp_dnode_info_list(struct rb_root *list) |
545 | { | |
e8bbeeb7 | 546 | struct jffs2_tmp_dnode_info *tn, *next; |
f97117d1 | 547 | |
e8bbeeb7 | 548 | rbtree_postorder_for_each_entry_safe(tn, next, list, rb) { |
f97117d1 AB |
549 | jffs2_free_full_dnode(tn->fn); |
550 | jffs2_free_tmp_dnode_info(tn); | |
f97117d1 | 551 | } |
e8bbeeb7 | 552 | |
bcc54e2a | 553 | *list = RB_ROOT; |
f97117d1 | 554 | } |
1da177e4 | 555 | |
f97117d1 AB |
556 | static void jffs2_free_full_dirent_list(struct jffs2_full_dirent *fd) |
557 | { | |
558 | struct jffs2_full_dirent *next; | |
336d2ff7 | 559 | |
f97117d1 AB |
560 | while (fd) { |
561 | next = fd->next; | |
562 | jffs2_free_full_dirent(fd); | |
563 | fd = next; | |
564 | } | |
565 | } | |
1da177e4 | 566 | |
f97117d1 AB |
567 | /* Returns first valid node after 'ref'. May return 'ref' */ |
568 | static struct jffs2_raw_node_ref *jffs2_first_valid_node(struct jffs2_raw_node_ref *ref) | |
569 | { | |
570 | while (ref && ref->next_in_ino) { | |
571 | if (!ref_obsolete(ref)) | |
572 | return ref; | |
733802d9 | 573 | dbg_noderef("node at 0x%08x is obsoleted. Ignoring.\n", ref_offset(ref)); |
f97117d1 AB |
574 | ref = ref->next_in_ino; |
575 | } | |
576 | return NULL; | |
577 | } | |
1da177e4 | 578 | |
f97117d1 AB |
579 | /* |
580 | * Helper function for jffs2_get_inode_nodes(). | |
581 | * It is called every time an directory entry node is found. | |
582 | * | |
14c6381e | 583 | * Returns: 0 on success; |
f97117d1 AB |
584 | * negative error code on failure. |
585 | */ | |
1e0da3cb | 586 | static inline int read_direntry(struct jffs2_sb_info *c, struct jffs2_raw_node_ref *ref, |
df8e96f3 DW |
587 | struct jffs2_raw_dirent *rd, size_t read, |
588 | struct jffs2_readinode_info *rii) | |
f97117d1 AB |
589 | { |
590 | struct jffs2_full_dirent *fd; | |
1046d880 | 591 | uint32_t crc; |
182ec4ee | 592 | |
f97117d1 AB |
593 | /* Obsoleted. This cannot happen, surely? dwmw2 20020308 */ |
594 | BUG_ON(ref_obsolete(ref)); | |
182ec4ee | 595 | |
1046d880 DW |
596 | crc = crc32(0, rd, sizeof(*rd) - 8); |
597 | if (unlikely(crc != je32_to_cpu(rd->node_crc))) { | |
598 | JFFS2_NOTICE("header CRC failed on dirent node at %#08x: read %#08x, calculated %#08x\n", | |
599 | ref_offset(ref), je32_to_cpu(rd->node_crc), crc); | |
df8e96f3 DW |
600 | jffs2_mark_node_obsolete(c, ref); |
601 | return 0; | |
f97117d1 | 602 | } |
182ec4ee | 603 | |
1046d880 DW |
604 | /* If we've never checked the CRCs on this node, check them now */ |
605 | if (ref_flags(ref) == REF_UNCHECKED) { | |
606 | struct jffs2_eraseblock *jeb; | |
607 | int len; | |
608 | ||
609 | /* Sanity check */ | |
610 | if (unlikely(PAD((rd->nsize + sizeof(*rd))) != PAD(je32_to_cpu(rd->totlen)))) { | |
611 | JFFS2_ERROR("illegal nsize in node at %#08x: nsize %#02x, totlen %#04x\n", | |
612 | ref_offset(ref), rd->nsize, je32_to_cpu(rd->totlen)); | |
df8e96f3 DW |
613 | jffs2_mark_node_obsolete(c, ref); |
614 | return 0; | |
1046d880 DW |
615 | } |
616 | ||
617 | jeb = &c->blocks[ref->flash_offset / c->sector_size]; | |
618 | len = ref_totlen(c, jeb, ref); | |
619 | ||
620 | spin_lock(&c->erase_completion_lock); | |
621 | jeb->used_size += len; | |
622 | jeb->unchecked_size -= len; | |
623 | c->used_size += len; | |
624 | c->unchecked_size -= len; | |
43dfa07f | 625 | ref->flash_offset = ref_offset(ref) | dirent_node_state(rd); |
1046d880 DW |
626 | spin_unlock(&c->erase_completion_lock); |
627 | } | |
628 | ||
f97117d1 AB |
629 | fd = jffs2_alloc_full_dirent(rd->nsize + 1); |
630 | if (unlikely(!fd)) | |
631 | return -ENOMEM; | |
1da177e4 | 632 | |
f97117d1 AB |
633 | fd->raw = ref; |
634 | fd->version = je32_to_cpu(rd->version); | |
635 | fd->ino = je32_to_cpu(rd->ino); | |
636 | fd->type = rd->type; | |
1da177e4 | 637 | |
df8e96f3 DW |
638 | if (fd->version > rii->highest_version) |
639 | rii->highest_version = fd->version; | |
640 | ||
f97117d1 | 641 | /* Pick out the mctime of the latest dirent */ |
df8e96f3 DW |
642 | if(fd->version > rii->mctime_ver && je32_to_cpu(rd->mctime)) { |
643 | rii->mctime_ver = fd->version; | |
644 | rii->latest_mctime = je32_to_cpu(rd->mctime); | |
1da177e4 LT |
645 | } |
646 | ||
182ec4ee | 647 | /* |
f97117d1 AB |
648 | * Copy as much of the name as possible from the raw |
649 | * dirent we've already read from the flash. | |
650 | */ | |
651 | if (read > sizeof(*rd)) | |
652 | memcpy(&fd->name[0], &rd->name[0], | |
653 | min_t(uint32_t, rd->nsize, (read - sizeof(*rd)) )); | |
182ec4ee | 654 | |
f97117d1 AB |
655 | /* Do we need to copy any more of the name directly from the flash? */ |
656 | if (rd->nsize + sizeof(*rd) > read) { | |
657 | /* FIXME: point() */ | |
658 | int err; | |
659 | int already = read - sizeof(*rd); | |
182ec4ee TG |
660 | |
661 | err = jffs2_flash_read(c, (ref_offset(ref)) + read, | |
f97117d1 AB |
662 | rd->nsize - already, &read, &fd->name[already]); |
663 | if (unlikely(read != rd->nsize - already) && likely(!err)) | |
664 | return -EIO; | |
182ec4ee | 665 | |
f97117d1 | 666 | if (unlikely(err)) { |
e0d60137 | 667 | JFFS2_ERROR("read remainder of name: error %d\n", err); |
f97117d1 AB |
668 | jffs2_free_full_dirent(fd); |
669 | return -EIO; | |
1da177e4 LT |
670 | } |
671 | } | |
182ec4ee | 672 | |
f97117d1 AB |
673 | fd->nhash = full_name_hash(fd->name, rd->nsize); |
674 | fd->next = NULL; | |
675 | fd->name[rd->nsize] = '\0'; | |
182ec4ee | 676 | |
f97117d1 AB |
677 | /* |
678 | * Wheee. We now have a complete jffs2_full_dirent structure, with | |
182ec4ee | 679 | * the name in it and everything. Link it into the list |
f97117d1 | 680 | */ |
df8e96f3 | 681 | jffs2_add_fd_to_list(c, fd, &rii->fds); |
f97117d1 | 682 | |
1da177e4 LT |
683 | return 0; |
684 | } | |
685 | ||
f97117d1 AB |
686 | /* |
687 | * Helper function for jffs2_get_inode_nodes(). | |
688 | * It is called every time an inode node is found. | |
689 | * | |
14c6381e | 690 | * Returns: 0 on success (possibly after marking a bad node obsolete); |
f97117d1 AB |
691 | * negative error code on failure. |
692 | */ | |
1e0da3cb | 693 | static inline int read_dnode(struct jffs2_sb_info *c, struct jffs2_raw_node_ref *ref, |
df8e96f3 DW |
694 | struct jffs2_raw_inode *rd, int rdlen, |
695 | struct jffs2_readinode_info *rii) | |
1da177e4 | 696 | { |
f97117d1 | 697 | struct jffs2_tmp_dnode_info *tn; |
1e0da3cb | 698 | uint32_t len, csize; |
14c6381e | 699 | int ret = 0; |
1046d880 | 700 | uint32_t crc; |
182ec4ee | 701 | |
f97117d1 AB |
702 | /* Obsoleted. This cannot happen, surely? dwmw2 20020308 */ |
703 | BUG_ON(ref_obsolete(ref)); | |
704 | ||
1046d880 DW |
705 | crc = crc32(0, rd, sizeof(*rd) - 8); |
706 | if (unlikely(crc != je32_to_cpu(rd->node_crc))) { | |
707 | JFFS2_NOTICE("node CRC failed on dnode at %#08x: read %#08x, calculated %#08x\n", | |
708 | ref_offset(ref), je32_to_cpu(rd->node_crc), crc); | |
df8e96f3 DW |
709 | jffs2_mark_node_obsolete(c, ref); |
710 | return 0; | |
1046d880 DW |
711 | } |
712 | ||
1e0da3cb AB |
713 | tn = jffs2_alloc_tmp_dnode_info(); |
714 | if (!tn) { | |
fb6a82c9 | 715 | JFFS2_ERROR("failed to allocate tn (%zu bytes).\n", sizeof(*tn)); |
1e0da3cb AB |
716 | return -ENOMEM; |
717 | } | |
718 | ||
719 | tn->partial_crc = 0; | |
720 | csize = je32_to_cpu(rd->csize); | |
182ec4ee | 721 | |
f97117d1 AB |
722 | /* If we've never checked the CRCs on this node, check them now */ |
723 | if (ref_flags(ref) == REF_UNCHECKED) { | |
182ec4ee | 724 | |
f97117d1 AB |
725 | /* Sanity checks */ |
726 | if (unlikely(je32_to_cpu(rd->offset) > je32_to_cpu(rd->isize)) || | |
727 | unlikely(PAD(je32_to_cpu(rd->csize) + sizeof(*rd)) != PAD(je32_to_cpu(rd->totlen)))) { | |
14c6381e DW |
728 | JFFS2_WARNING("inode node header CRC is corrupted at %#08x\n", ref_offset(ref)); |
729 | jffs2_dbg_dump_node(c, ref_offset(ref)); | |
730 | jffs2_mark_node_obsolete(c, ref); | |
1e0da3cb | 731 | goto free_out; |
1da177e4 LT |
732 | } |
733 | ||
1e0da3cb AB |
734 | if (jffs2_is_writebuffered(c) && csize != 0) { |
735 | /* At this point we are supposed to check the data CRC | |
736 | * of our unchecked node. But thus far, we do not | |
737 | * know whether the node is valid or obsolete. To | |
738 | * figure this out, we need to walk all the nodes of | |
739 | * the inode and build the inode fragtree. We don't | |
740 | * want to spend time checking data of nodes which may | |
741 | * later be found to be obsolete. So we put off the full | |
742 | * data CRC checking until we have read all the inode | |
743 | * nodes and have started building the fragtree. | |
744 | * | |
745 | * The fragtree is being built starting with nodes | |
746 | * having the highest version number, so we'll be able | |
747 | * to detect whether a node is valid (i.e., it is not | |
748 | * overlapped by a node with higher version) or not. | |
749 | * And we'll be able to check only those nodes, which | |
750 | * are not obsolete. | |
751 | * | |
752 | * Of course, this optimization only makes sense in case | |
e1b8513d | 753 | * of NAND flashes (or other flashes with |
1e0da3cb AB |
754 | * !jffs2_can_mark_obsolete()), since on NOR flashes |
755 | * nodes are marked obsolete physically. | |
756 | * | |
757 | * Since NAND flashes (or other flashes with | |
758 | * jffs2_is_writebuffered(c)) are anyway read by | |
759 | * fractions of c->wbuf_pagesize, and we have just read | |
760 | * the node header, it is likely that the starting part | |
761 | * of the node data is also read when we read the | |
762 | * header. So we don't mind to check the CRC of the | |
763 | * starting part of the data of the node now, and check | |
764 | * the second part later (in jffs2_check_node_data()). | |
765 | * Of course, we will not need to re-read and re-check | |
766 | * the NAND page which we have just read. This is why we | |
767 | * read the whole NAND page at jffs2_get_inode_nodes(), | |
768 | * while we needed only the node header. | |
769 | */ | |
770 | unsigned char *buf; | |
771 | ||
772 | /* 'buf' will point to the start of data */ | |
773 | buf = (unsigned char *)rd + sizeof(*rd); | |
774 | /* len will be the read data length */ | |
775 | len = min_t(uint32_t, rdlen - sizeof(*rd), csize); | |
280562b2 AB |
776 | tn->partial_crc = crc32(0, buf, len); |
777 | ||
733802d9 | 778 | dbg_readinode("Calculates CRC (%#08x) for %d bytes, csize %d\n", tn->partial_crc, len, csize); |
1e0da3cb AB |
779 | |
780 | /* If we actually calculated the whole data CRC | |
781 | * and it is wrong, drop the node. */ | |
3c091337 | 782 | if (len >= csize && unlikely(tn->partial_crc != je32_to_cpu(rd->data_crc))) { |
39243508 AB |
783 | JFFS2_NOTICE("wrong data CRC in data node at 0x%08x: read %#08x, calculated %#08x.\n", |
784 | ref_offset(ref), tn->partial_crc, je32_to_cpu(rd->data_crc)); | |
14c6381e | 785 | jffs2_mark_node_obsolete(c, ref); |
1e0da3cb | 786 | goto free_out; |
39243508 | 787 | } |
1da177e4 | 788 | |
1e0da3cb AB |
789 | } else if (csize == 0) { |
790 | /* | |
791 | * We checked the header CRC. If the node has no data, adjust | |
792 | * the space accounting now. For other nodes this will be done | |
793 | * later either when the node is marked obsolete or when its | |
794 | * data is checked. | |
795 | */ | |
796 | struct jffs2_eraseblock *jeb; | |
797 | ||
733802d9 | 798 | dbg_readinode("the node has no data.\n"); |
1e0da3cb AB |
799 | jeb = &c->blocks[ref->flash_offset / c->sector_size]; |
800 | len = ref_totlen(c, jeb, ref); | |
801 | ||
802 | spin_lock(&c->erase_completion_lock); | |
803 | jeb->used_size += len; | |
804 | jeb->unchecked_size -= len; | |
805 | c->used_size += len; | |
806 | c->unchecked_size -= len; | |
f97117d1 | 807 | ref->flash_offset = ref_offset(ref) | REF_NORMAL; |
1e0da3cb | 808 | spin_unlock(&c->erase_completion_lock); |
1da177e4 | 809 | } |
1da177e4 | 810 | } |
1da177e4 | 811 | |
f97117d1 AB |
812 | tn->fn = jffs2_alloc_full_dnode(); |
813 | if (!tn->fn) { | |
e0d60137 | 814 | JFFS2_ERROR("alloc fn failed\n"); |
1e0da3cb AB |
815 | ret = -ENOMEM; |
816 | goto free_out; | |
f97117d1 | 817 | } |
182ec4ee | 818 | |
f97117d1 AB |
819 | tn->version = je32_to_cpu(rd->version); |
820 | tn->fn->ofs = je32_to_cpu(rd->offset); | |
1e0da3cb AB |
821 | tn->data_crc = je32_to_cpu(rd->data_crc); |
822 | tn->csize = csize; | |
f97117d1 | 823 | tn->fn->raw = ref; |
df8e96f3 DW |
824 | tn->overlapped = 0; |
825 | ||
826 | if (tn->version > rii->highest_version) | |
827 | rii->highest_version = tn->version; | |
182ec4ee | 828 | |
f97117d1 AB |
829 | /* There was a bug where we wrote hole nodes out with |
830 | csize/dsize swapped. Deal with it */ | |
1e0da3cb AB |
831 | if (rd->compr == JFFS2_COMPR_ZERO && !je32_to_cpu(rd->dsize) && csize) |
832 | tn->fn->size = csize; | |
f97117d1 AB |
833 | else // normal case... |
834 | tn->fn->size = je32_to_cpu(rd->dsize); | |
835 | ||
2c61cb25 DW |
836 | dbg_readinode2("dnode @%08x: ver %u, offset %#04x, dsize %#04x, csize %#04x\n", |
837 | ref_offset(ref), je32_to_cpu(rd->version), | |
838 | je32_to_cpu(rd->offset), je32_to_cpu(rd->dsize), csize); | |
182ec4ee | 839 | |
df8e96f3 | 840 | ret = jffs2_add_tn_to_tree(c, rii, tn); |
1da177e4 | 841 | |
df8e96f3 DW |
842 | if (ret) { |
843 | jffs2_free_full_dnode(tn->fn); | |
844 | free_out: | |
845 | jffs2_free_tmp_dnode_info(tn); | |
846 | return ret; | |
847 | } | |
2c61cb25 DW |
848 | #ifdef JFFS2_DBG_READINODE2_MESSAGES |
849 | dbg_readinode2("After adding ver %d:\n", je32_to_cpu(rd->version)); | |
df8e96f3 DW |
850 | tn = tn_first(&rii->tn_root); |
851 | while (tn) { | |
2c61cb25 DW |
852 | dbg_readinode2("%p: v %d r 0x%x-0x%x ov %d\n", |
853 | tn, tn->version, tn->fn->ofs, | |
854 | tn->fn->ofs+tn->fn->size, tn->overlapped); | |
df8e96f3 DW |
855 | tn = tn_next(tn); |
856 | } | |
857 | #endif | |
1da177e4 LT |
858 | return 0; |
859 | } | |
860 | ||
f97117d1 AB |
861 | /* |
862 | * Helper function for jffs2_get_inode_nodes(). | |
863 | * It is called every time an unknown node is found. | |
864 | * | |
3877f0b6 | 865 | * Returns: 0 on success; |
f97117d1 AB |
866 | * negative error code on failure. |
867 | */ | |
1e0da3cb | 868 | static inline int read_unknown(struct jffs2_sb_info *c, struct jffs2_raw_node_ref *ref, struct jffs2_unknown_node *un) |
1da177e4 | 869 | { |
f97117d1 | 870 | /* We don't mark unknown nodes as REF_UNCHECKED */ |
c7258a44 DW |
871 | if (ref_flags(ref) == REF_UNCHECKED) { |
872 | JFFS2_ERROR("REF_UNCHECKED but unknown node at %#08x\n", | |
873 | ref_offset(ref)); | |
874 | JFFS2_ERROR("Node is {%04x,%04x,%08x,%08x}. Please report this error.\n", | |
ef53cb02 DW |
875 | je16_to_cpu(un->magic), je16_to_cpu(un->nodetype), |
876 | je32_to_cpu(un->totlen), je32_to_cpu(un->hdr_crc)); | |
df8e96f3 DW |
877 | jffs2_mark_node_obsolete(c, ref); |
878 | return 0; | |
c7258a44 | 879 | } |
182ec4ee | 880 | |
f97117d1 | 881 | un->nodetype = cpu_to_je16(JFFS2_NODE_ACCURATE | je16_to_cpu(un->nodetype)); |
1da177e4 | 882 | |
3877f0b6 DW |
883 | switch(je16_to_cpu(un->nodetype) & JFFS2_COMPAT_MASK) { |
884 | ||
885 | case JFFS2_FEATURE_INCOMPAT: | |
886 | JFFS2_ERROR("unknown INCOMPAT nodetype %#04X at %#08x\n", | |
887 | je16_to_cpu(un->nodetype), ref_offset(ref)); | |
888 | /* EEP */ | |
889 | BUG(); | |
890 | break; | |
891 | ||
892 | case JFFS2_FEATURE_ROCOMPAT: | |
893 | JFFS2_ERROR("unknown ROCOMPAT nodetype %#04X at %#08x\n", | |
894 | je16_to_cpu(un->nodetype), ref_offset(ref)); | |
895 | BUG_ON(!(c->flags & JFFS2_SB_FLAG_RO)); | |
896 | break; | |
897 | ||
898 | case JFFS2_FEATURE_RWCOMPAT_COPY: | |
899 | JFFS2_NOTICE("unknown RWCOMPAT_COPY nodetype %#04X at %#08x\n", | |
900 | je16_to_cpu(un->nodetype), ref_offset(ref)); | |
901 | break; | |
902 | ||
903 | case JFFS2_FEATURE_RWCOMPAT_DELETE: | |
904 | JFFS2_NOTICE("unknown RWCOMPAT_DELETE nodetype %#04X at %#08x\n", | |
905 | je16_to_cpu(un->nodetype), ref_offset(ref)); | |
df8e96f3 DW |
906 | jffs2_mark_node_obsolete(c, ref); |
907 | return 0; | |
1da177e4 | 908 | } |
1da177e4 | 909 | |
f97117d1 | 910 | return 0; |
1da177e4 LT |
911 | } |
912 | ||
1e0da3cb AB |
913 | /* |
914 | * Helper function for jffs2_get_inode_nodes(). | |
915 | * The function detects whether more data should be read and reads it if yes. | |
916 | * | |
af901ca1 | 917 | * Returns: 0 on success; |
1e0da3cb AB |
918 | * negative error code on failure. |
919 | */ | |
920 | static int read_more(struct jffs2_sb_info *c, struct jffs2_raw_node_ref *ref, | |
10731f83 | 921 | int needed_len, int *rdlen, unsigned char *buf) |
1e0da3cb | 922 | { |
10731f83 | 923 | int err, to_read = needed_len - *rdlen; |
1e0da3cb AB |
924 | size_t retlen; |
925 | uint32_t offs; | |
926 | ||
927 | if (jffs2_is_writebuffered(c)) { | |
10731f83 | 928 | int rem = to_read % c->wbuf_pagesize; |
1e0da3cb | 929 | |
10731f83 AB |
930 | if (rem) |
931 | to_read += c->wbuf_pagesize - rem; | |
932 | } | |
1e0da3cb AB |
933 | |
934 | /* We need to read more data */ | |
935 | offs = ref_offset(ref) + *rdlen; | |
182ec4ee | 936 | |
10731f83 | 937 | dbg_readinode("read more %d bytes\n", to_read); |
1e0da3cb | 938 | |
10731f83 | 939 | err = jffs2_flash_read(c, offs, to_read, &retlen, buf + *rdlen); |
1e0da3cb AB |
940 | if (err) { |
941 | JFFS2_ERROR("can not read %d bytes from 0x%08x, " | |
10731f83 | 942 | "error code: %d.\n", to_read, offs, err); |
1e0da3cb AB |
943 | return err; |
944 | } | |
182ec4ee | 945 | |
10731f83 | 946 | if (retlen < to_read) { |
fb6a82c9 | 947 | JFFS2_ERROR("short read at %#08x: %zu instead of %d.\n", |
10731f83 | 948 | offs, retlen, to_read); |
1e0da3cb AB |
949 | return -EIO; |
950 | } | |
951 | ||
10731f83 | 952 | *rdlen += to_read; |
1e0da3cb AB |
953 | return 0; |
954 | } | |
955 | ||
f97117d1 | 956 | /* Get tmp_dnode_info and full_dirent for all non-obsolete nodes associated |
df8e96f3 DW |
957 | with this ino. Perform a preliminary ordering on data nodes, throwing away |
958 | those which are completely obsoleted by newer ones. The naïve approach we | |
959 | use to take of just returning them _all_ in version order will cause us to | |
960 | run out of memory in certain degenerate cases. */ | |
f97117d1 | 961 | static int jffs2_get_inode_nodes(struct jffs2_sb_info *c, struct jffs2_inode_info *f, |
df8e96f3 | 962 | struct jffs2_readinode_info *rii) |
1da177e4 | 963 | { |
f97117d1 | 964 | struct jffs2_raw_node_ref *ref, *valid_ref; |
1e0da3cb AB |
965 | unsigned char *buf = NULL; |
966 | union jffs2_node_union *node; | |
f97117d1 | 967 | size_t retlen; |
1e0da3cb | 968 | int len, err; |
1da177e4 | 969 | |
df8e96f3 | 970 | rii->mctime_ver = 0; |
182ec4ee | 971 | |
733802d9 | 972 | dbg_readinode("ino #%u\n", f->inocache->ino); |
1da177e4 | 973 | |
1e0da3cb AB |
974 | /* FIXME: in case of NOR and available ->point() this |
975 | * needs to be fixed. */ | |
10731f83 | 976 | len = sizeof(union jffs2_node_union) + c->wbuf_pagesize; |
1e0da3cb AB |
977 | buf = kmalloc(len, GFP_KERNEL); |
978 | if (!buf) | |
979 | return -ENOMEM; | |
182ec4ee | 980 | |
1e0da3cb | 981 | spin_lock(&c->erase_completion_lock); |
f97117d1 | 982 | valid_ref = jffs2_first_valid_node(f->inocache->nodes); |
1e0da3cb AB |
983 | if (!valid_ref && f->inocache->ino != 1) |
984 | JFFS2_WARNING("Eep. No valid nodes for ino #%u.\n", f->inocache->ino); | |
f97117d1 AB |
985 | while (valid_ref) { |
986 | /* We can hold a pointer to a non-obsolete node without the spinlock, | |
987 | but _obsolete_ nodes may disappear at any time, if the block | |
988 | they're in gets erased. So if we mark 'ref' obsolete while we're | |
989 | not holding the lock, it can go away immediately. For that reason, | |
990 | we find the next valid node first, before processing 'ref'. | |
991 | */ | |
992 | ref = valid_ref; | |
993 | valid_ref = jffs2_first_valid_node(ref->next_in_ino); | |
994 | spin_unlock(&c->erase_completion_lock); | |
995 | ||
996 | cond_resched(); | |
997 | ||
1e0da3cb AB |
998 | /* |
999 | * At this point we don't know the type of the node we're going | |
1000 | * to read, so we do not know the size of its header. In order | |
10731f83 AB |
1001 | * to minimize the amount of flash IO we assume the header is |
1002 | * of size = JFFS2_MIN_NODE_HEADER. | |
1e0da3cb | 1003 | */ |
10731f83 | 1004 | len = JFFS2_MIN_NODE_HEADER; |
1e0da3cb | 1005 | if (jffs2_is_writebuffered(c)) { |
10731f83 AB |
1006 | int end, rem; |
1007 | ||
182ec4ee | 1008 | /* |
10731f83 AB |
1009 | * We are about to read JFFS2_MIN_NODE_HEADER bytes, |
1010 | * but this flash has some minimal I/O unit. It is | |
1011 | * possible that we'll need to read more soon, so read | |
1012 | * up to the next min. I/O unit, in order not to | |
1013 | * re-read the same min. I/O unit twice. | |
1e0da3cb | 1014 | */ |
10731f83 AB |
1015 | end = ref_offset(ref) + len; |
1016 | rem = end % c->wbuf_pagesize; | |
1017 | if (rem) | |
1018 | end += c->wbuf_pagesize - rem; | |
1019 | len = end - ref_offset(ref); | |
1e0da3cb AB |
1020 | } |
1021 | ||
733802d9 | 1022 | dbg_readinode("read %d bytes at %#08x(%d).\n", len, ref_offset(ref), ref_flags(ref)); |
1e0da3cb | 1023 | |
f97117d1 | 1024 | /* FIXME: point() */ |
10731f83 | 1025 | err = jffs2_flash_read(c, ref_offset(ref), len, &retlen, buf); |
f97117d1 | 1026 | if (err) { |
df2e301f | 1027 | JFFS2_ERROR("can not read %d bytes from 0x%08x, error code: %d.\n", len, ref_offset(ref), err); |
1e0da3cb AB |
1028 | goto free_out; |
1029 | } | |
182ec4ee | 1030 | |
1e0da3cb | 1031 | if (retlen < len) { |
fb6a82c9 | 1032 | JFFS2_ERROR("short read at %#08x: %zu instead of %d.\n", ref_offset(ref), retlen, len); |
1e0da3cb | 1033 | err = -EIO; |
f97117d1 AB |
1034 | goto free_out; |
1035 | } | |
182ec4ee | 1036 | |
10731f83 | 1037 | node = (union jffs2_node_union *)buf; |
182ec4ee | 1038 | |
3877f0b6 DW |
1039 | /* No need to mask in the valid bit; it shouldn't be invalid */ |
1040 | if (je32_to_cpu(node->u.hdr_crc) != crc32(0, node, sizeof(node->u)-4)) { | |
1041 | JFFS2_NOTICE("Node header CRC failed at %#08x. {%04x,%04x,%08x,%08x}\n", | |
1042 | ref_offset(ref), je16_to_cpu(node->u.magic), | |
1043 | je16_to_cpu(node->u.nodetype), | |
1044 | je32_to_cpu(node->u.totlen), | |
1045 | je32_to_cpu(node->u.hdr_crc)); | |
1046 | jffs2_dbg_dump_node(c, ref_offset(ref)); | |
1047 | jffs2_mark_node_obsolete(c, ref); | |
1048 | goto cont; | |
1049 | } | |
0dec4c8b JT |
1050 | if (je16_to_cpu(node->u.magic) != JFFS2_MAGIC_BITMASK) { |
1051 | /* Not a JFFS2 node, whinge and move on */ | |
1052 | JFFS2_NOTICE("Wrong magic bitmask 0x%04x in node header at %#08x.\n", | |
1053 | je16_to_cpu(node->u.magic), ref_offset(ref)); | |
c7258a44 DW |
1054 | jffs2_mark_node_obsolete(c, ref); |
1055 | goto cont; | |
1056 | } | |
3877f0b6 | 1057 | |
1e0da3cb | 1058 | switch (je16_to_cpu(node->u.nodetype)) { |
182ec4ee | 1059 | |
f97117d1 | 1060 | case JFFS2_NODETYPE_DIRENT: |
f97117d1 | 1061 | |
ea55d307 AB |
1062 | if (JFFS2_MIN_NODE_HEADER < sizeof(struct jffs2_raw_dirent) && |
1063 | len < sizeof(struct jffs2_raw_dirent)) { | |
10731f83 | 1064 | err = read_more(c, ref, sizeof(struct jffs2_raw_dirent), &len, buf); |
1e0da3cb AB |
1065 | if (unlikely(err)) |
1066 | goto free_out; | |
1067 | } | |
182ec4ee | 1068 | |
df8e96f3 DW |
1069 | err = read_direntry(c, ref, &node->d, retlen, rii); |
1070 | if (unlikely(err)) | |
f97117d1 | 1071 | goto free_out; |
182ec4ee | 1072 | |
1da177e4 LT |
1073 | break; |
1074 | ||
f97117d1 | 1075 | case JFFS2_NODETYPE_INODE: |
182ec4ee | 1076 | |
ea55d307 AB |
1077 | if (JFFS2_MIN_NODE_HEADER < sizeof(struct jffs2_raw_inode) && |
1078 | len < sizeof(struct jffs2_raw_inode)) { | |
10731f83 | 1079 | err = read_more(c, ref, sizeof(struct jffs2_raw_inode), &len, buf); |
1e0da3cb AB |
1080 | if (unlikely(err)) |
1081 | goto free_out; | |
f97117d1 | 1082 | } |
1da177e4 | 1083 | |
df8e96f3 DW |
1084 | err = read_dnode(c, ref, &node->i, len, rii); |
1085 | if (unlikely(err)) | |
f97117d1 | 1086 | goto free_out; |
1da177e4 | 1087 | |
f97117d1 | 1088 | break; |
1da177e4 | 1089 | |
f97117d1 | 1090 | default: |
ea55d307 AB |
1091 | if (JFFS2_MIN_NODE_HEADER < sizeof(struct jffs2_unknown_node) && |
1092 | len < sizeof(struct jffs2_unknown_node)) { | |
10731f83 | 1093 | err = read_more(c, ref, sizeof(struct jffs2_unknown_node), &len, buf); |
1e0da3cb AB |
1094 | if (unlikely(err)) |
1095 | goto free_out; | |
f97117d1 | 1096 | } |
182ec4ee | 1097 | |
1e0da3cb | 1098 | err = read_unknown(c, ref, &node->u); |
14c6381e | 1099 | if (unlikely(err)) |
f97117d1 AB |
1100 | goto free_out; |
1101 | ||
1102 | } | |
3877f0b6 | 1103 | cont: |
f97117d1 | 1104 | spin_lock(&c->erase_completion_lock); |
1da177e4 | 1105 | } |
1e0da3cb | 1106 | |
f97117d1 | 1107 | spin_unlock(&c->erase_completion_lock); |
1e0da3cb | 1108 | kfree(buf); |
f97117d1 | 1109 | |
df8e96f3 DW |
1110 | f->highest_version = rii->highest_version; |
1111 | ||
733802d9 | 1112 | dbg_readinode("nodes of inode #%u were read, the highest version is %u, latest_mctime %u, mctime_ver %u.\n", |
df8e96f3 DW |
1113 | f->inocache->ino, rii->highest_version, rii->latest_mctime, |
1114 | rii->mctime_ver); | |
f97117d1 AB |
1115 | return 0; |
1116 | ||
1117 | free_out: | |
df8e96f3 DW |
1118 | jffs2_free_tmp_dnode_info_list(&rii->tn_root); |
1119 | jffs2_free_full_dirent_list(rii->fds); | |
1120 | rii->fds = NULL; | |
1e0da3cb | 1121 | kfree(buf); |
f97117d1 | 1122 | return err; |
1da177e4 LT |
1123 | } |
1124 | ||
182ec4ee | 1125 | static int jffs2_do_read_inode_internal(struct jffs2_sb_info *c, |
1da177e4 LT |
1126 | struct jffs2_inode_info *f, |
1127 | struct jffs2_raw_inode *latest_node) | |
1128 | { | |
df8e96f3 | 1129 | struct jffs2_readinode_info rii; |
61c4b237 | 1130 | uint32_t crc, new_size; |
1da177e4 LT |
1131 | size_t retlen; |
1132 | int ret; | |
1133 | ||
27c72b04 DW |
1134 | dbg_readinode("ino #%u pino/nlink is %d\n", f->inocache->ino, |
1135 | f->inocache->pino_nlink); | |
1da177e4 | 1136 | |
df8e96f3 DW |
1137 | memset(&rii, 0, sizeof(rii)); |
1138 | ||
1da177e4 | 1139 | /* Grab all nodes relevant to this ino */ |
df8e96f3 | 1140 | ret = jffs2_get_inode_nodes(c, f, &rii); |
1da177e4 LT |
1141 | |
1142 | if (ret) { | |
e0d60137 | 1143 | JFFS2_ERROR("cannot read nodes for ino %u, returned error is %d\n", f->inocache->ino, ret); |
1da177e4 LT |
1144 | if (f->inocache->state == INO_STATE_READING) |
1145 | jffs2_set_inocache_state(c, f->inocache, INO_STATE_CHECKEDABSENT); | |
1146 | return ret; | |
1147 | } | |
1da177e4 | 1148 | |
df8e96f3 DW |
1149 | ret = jffs2_build_inode_fragtree(c, f, &rii); |
1150 | if (ret) { | |
1151 | JFFS2_ERROR("Failed to build final fragtree for inode #%u: error %d\n", | |
1152 | f->inocache->ino, ret); | |
1153 | if (f->inocache->state == INO_STATE_READING) | |
1154 | jffs2_set_inocache_state(c, f->inocache, INO_STATE_CHECKEDABSENT); | |
1155 | jffs2_free_tmp_dnode_info_list(&rii.tn_root); | |
1156 | /* FIXME: We could at least crc-check them all */ | |
1157 | if (rii.mdata_tn) { | |
1158 | jffs2_free_full_dnode(rii.mdata_tn->fn); | |
1159 | jffs2_free_tmp_dnode_info(rii.mdata_tn); | |
1160 | rii.mdata_tn = NULL; | |
1161 | } | |
1162 | return ret; | |
1163 | } | |
9dee7503 | 1164 | |
df8e96f3 DW |
1165 | if (rii.mdata_tn) { |
1166 | if (rii.mdata_tn->fn->raw == rii.latest_ref) { | |
1167 | f->metadata = rii.mdata_tn->fn; | |
1168 | jffs2_free_tmp_dnode_info(rii.mdata_tn); | |
1169 | } else { | |
1170 | jffs2_kill_tn(c, rii.mdata_tn); | |
1e0da3cb | 1171 | } |
df8e96f3 | 1172 | rii.mdata_tn = NULL; |
1da177e4 | 1173 | } |
1da177e4 | 1174 | |
df8e96f3 DW |
1175 | f->dents = rii.fds; |
1176 | ||
1177 | jffs2_dbg_fragtree_paranoia_check_nolock(f); | |
1e0da3cb | 1178 | |
df8e96f3 | 1179 | if (unlikely(!rii.latest_ref)) { |
1da177e4 LT |
1180 | /* No data nodes for this inode. */ |
1181 | if (f->inocache->ino != 1) { | |
e0d60137 | 1182 | JFFS2_WARNING("no data nodes found for ino #%u\n", f->inocache->ino); |
df8e96f3 | 1183 | if (!rii.fds) { |
1da177e4 LT |
1184 | if (f->inocache->state == INO_STATE_READING) |
1185 | jffs2_set_inocache_state(c, f->inocache, INO_STATE_CHECKEDABSENT); | |
1186 | return -EIO; | |
1187 | } | |
e0d60137 | 1188 | JFFS2_NOTICE("but it has children so we fake some modes for it\n"); |
1da177e4 LT |
1189 | } |
1190 | latest_node->mode = cpu_to_jemode(S_IFDIR|S_IRUGO|S_IWUSR|S_IXUGO); | |
1191 | latest_node->version = cpu_to_je32(0); | |
1192 | latest_node->atime = latest_node->ctime = latest_node->mtime = cpu_to_je32(0); | |
1193 | latest_node->isize = cpu_to_je32(0); | |
1194 | latest_node->gid = cpu_to_je16(0); | |
1195 | latest_node->uid = cpu_to_je16(0); | |
1196 | if (f->inocache->state == INO_STATE_READING) | |
1197 | jffs2_set_inocache_state(c, f->inocache, INO_STATE_PRESENT); | |
1198 | return 0; | |
1199 | } | |
1200 | ||
df8e96f3 | 1201 | ret = jffs2_flash_read(c, ref_offset(rii.latest_ref), sizeof(*latest_node), &retlen, (void *)latest_node); |
1da177e4 | 1202 | if (ret || retlen != sizeof(*latest_node)) { |
e0d60137 AB |
1203 | JFFS2_ERROR("failed to read from flash: error %d, %zd of %zd bytes read\n", |
1204 | ret, retlen, sizeof(*latest_node)); | |
1da177e4 | 1205 | /* FIXME: If this fails, there seems to be a memory leak. Find it. */ |
ced22070 | 1206 | mutex_unlock(&f->sem); |
1da177e4 LT |
1207 | jffs2_do_clear_inode(c, f); |
1208 | return ret?ret:-EIO; | |
1209 | } | |
1210 | ||
1211 | crc = crc32(0, latest_node, sizeof(*latest_node)-8); | |
1212 | if (crc != je32_to_cpu(latest_node->node_crc)) { | |
e0d60137 | 1213 | JFFS2_ERROR("CRC failed for read_inode of inode %u at physical location 0x%x\n", |
df8e96f3 | 1214 | f->inocache->ino, ref_offset(rii.latest_ref)); |
ced22070 | 1215 | mutex_unlock(&f->sem); |
1da177e4 LT |
1216 | jffs2_do_clear_inode(c, f); |
1217 | return -EIO; | |
1218 | } | |
1219 | ||
1220 | switch(jemode_to_cpu(latest_node->mode) & S_IFMT) { | |
1221 | case S_IFDIR: | |
df8e96f3 | 1222 | if (rii.mctime_ver > je32_to_cpu(latest_node->version)) { |
1da177e4 LT |
1223 | /* The times in the latest_node are actually older than |
1224 | mctime in the latest dirent. Cheat. */ | |
df8e96f3 | 1225 | latest_node->ctime = latest_node->mtime = cpu_to_je32(rii.latest_mctime); |
1da177e4 LT |
1226 | } |
1227 | break; | |
1228 | ||
182ec4ee | 1229 | |
1da177e4 LT |
1230 | case S_IFREG: |
1231 | /* If it was a regular file, truncate it to the latest node's isize */ | |
61c4b237 DW |
1232 | new_size = jffs2_truncate_fragtree(c, &f->fragtree, je32_to_cpu(latest_node->isize)); |
1233 | if (new_size != je32_to_cpu(latest_node->isize)) { | |
1234 | JFFS2_WARNING("Truncating ino #%u to %d bytes failed because it only had %d bytes to start with!\n", | |
1235 | f->inocache->ino, je32_to_cpu(latest_node->isize), new_size); | |
1236 | latest_node->isize = cpu_to_je32(new_size); | |
1237 | } | |
1da177e4 LT |
1238 | break; |
1239 | ||
1240 | case S_IFLNK: | |
1241 | /* Hack to work around broken isize in old symlink code. | |
1242 | Remove this when dwmw2 comes to his senses and stops | |
1243 | symlinks from being an entirely gratuitous special | |
1244 | case. */ | |
1245 | if (!je32_to_cpu(latest_node->isize)) | |
1246 | latest_node->isize = latest_node->dsize; | |
32f1a95d AB |
1247 | |
1248 | if (f->inocache->state != INO_STATE_CHECKING) { | |
1249 | /* Symlink's inode data is the target path. Read it and | |
2b79adcc AB |
1250 | * keep in RAM to facilitate quick follow symlink |
1251 | * operation. */ | |
7c80c352 XW |
1252 | uint32_t csize = je32_to_cpu(latest_node->csize); |
1253 | if (csize > JFFS2_MAX_NAME_LEN) { | |
1254 | mutex_unlock(&f->sem); | |
1255 | jffs2_do_clear_inode(c, f); | |
1256 | return -ENAMETOOLONG; | |
1257 | } | |
b6778fd7 | 1258 | f->target = kmalloc(csize + 1, GFP_KERNEL); |
2b79adcc | 1259 | if (!f->target) { |
b6778fd7 | 1260 | JFFS2_ERROR("can't allocate %u bytes of memory for the symlink target path cache\n", csize); |
ced22070 | 1261 | mutex_unlock(&f->sem); |
32f1a95d AB |
1262 | jffs2_do_clear_inode(c, f); |
1263 | return -ENOMEM; | |
1264 | } | |
182ec4ee | 1265 | |
df8e96f3 | 1266 | ret = jffs2_flash_read(c, ref_offset(rii.latest_ref) + sizeof(*latest_node), |
b6778fd7 | 1267 | csize, &retlen, (char *)f->target); |
182ec4ee | 1268 | |
b6778fd7 XW |
1269 | if (ret || retlen != csize) { |
1270 | if (retlen != csize) | |
32f1a95d | 1271 | ret = -EIO; |
2b79adcc AB |
1272 | kfree(f->target); |
1273 | f->target = NULL; | |
ced22070 | 1274 | mutex_unlock(&f->sem); |
32f1a95d | 1275 | jffs2_do_clear_inode(c, f); |
e670e41a | 1276 | return ret; |
32f1a95d AB |
1277 | } |
1278 | ||
b6778fd7 | 1279 | f->target[csize] = '\0'; |
733802d9 | 1280 | dbg_readinode("symlink's target '%s' cached\n", f->target); |
32f1a95d | 1281 | } |
182ec4ee | 1282 | |
1da177e4 LT |
1283 | /* fall through... */ |
1284 | ||
1285 | case S_IFBLK: | |
1286 | case S_IFCHR: | |
1287 | /* Certain inode types should have only one data node, and it's | |
1288 | kept as the metadata node */ | |
1289 | if (f->metadata) { | |
e0d60137 | 1290 | JFFS2_ERROR("Argh. Special inode #%u with mode 0%o had metadata node\n", |
1da177e4 | 1291 | f->inocache->ino, jemode_to_cpu(latest_node->mode)); |
ced22070 | 1292 | mutex_unlock(&f->sem); |
1da177e4 LT |
1293 | jffs2_do_clear_inode(c, f); |
1294 | return -EIO; | |
1295 | } | |
1296 | if (!frag_first(&f->fragtree)) { | |
e0d60137 | 1297 | JFFS2_ERROR("Argh. Special inode #%u with mode 0%o has no fragments\n", |
1da177e4 | 1298 | f->inocache->ino, jemode_to_cpu(latest_node->mode)); |
ced22070 | 1299 | mutex_unlock(&f->sem); |
1da177e4 LT |
1300 | jffs2_do_clear_inode(c, f); |
1301 | return -EIO; | |
1302 | } | |
1303 | /* ASSERT: f->fraglist != NULL */ | |
1304 | if (frag_next(frag_first(&f->fragtree))) { | |
e0d60137 | 1305 | JFFS2_ERROR("Argh. Special inode #%u with mode 0x%x had more than one node\n", |
1da177e4 LT |
1306 | f->inocache->ino, jemode_to_cpu(latest_node->mode)); |
1307 | /* FIXME: Deal with it - check crc32, check for duplicate node, check times and discard the older one */ | |
ced22070 | 1308 | mutex_unlock(&f->sem); |
1da177e4 LT |
1309 | jffs2_do_clear_inode(c, f); |
1310 | return -EIO; | |
1311 | } | |
1312 | /* OK. We're happy */ | |
1313 | f->metadata = frag_first(&f->fragtree)->node; | |
1314 | jffs2_free_node_frag(frag_first(&f->fragtree)); | |
1315 | f->fragtree = RB_ROOT; | |
1316 | break; | |
1317 | } | |
1318 | if (f->inocache->state == INO_STATE_READING) | |
1319 | jffs2_set_inocache_state(c, f->inocache, INO_STATE_PRESENT); | |
1320 | ||
1321 | return 0; | |
1322 | } | |
1323 | ||
f97117d1 | 1324 | /* Scan the list of all nodes present for this ino, build map of versions, etc. */ |
182ec4ee | 1325 | int jffs2_do_read_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, |
f97117d1 AB |
1326 | uint32_t ino, struct jffs2_raw_inode *latest_node) |
1327 | { | |
733802d9 | 1328 | dbg_readinode("read inode #%u\n", ino); |
f97117d1 AB |
1329 | |
1330 | retry_inocache: | |
1331 | spin_lock(&c->inocache_lock); | |
1332 | f->inocache = jffs2_get_ino_cache(c, ino); | |
1333 | ||
f97117d1 AB |
1334 | if (f->inocache) { |
1335 | /* Check its state. We may need to wait before we can use it */ | |
1336 | switch(f->inocache->state) { | |
1337 | case INO_STATE_UNCHECKED: | |
1338 | case INO_STATE_CHECKEDABSENT: | |
1339 | f->inocache->state = INO_STATE_READING; | |
1340 | break; | |
182ec4ee | 1341 | |
f97117d1 AB |
1342 | case INO_STATE_CHECKING: |
1343 | case INO_STATE_GC: | |
1344 | /* If it's in either of these states, we need | |
1345 | to wait for whoever's got it to finish and | |
1346 | put it back. */ | |
733802d9 | 1347 | dbg_readinode("waiting for ino #%u in state %d\n", ino, f->inocache->state); |
f97117d1 AB |
1348 | sleep_on_spinunlock(&c->inocache_wq, &c->inocache_lock); |
1349 | goto retry_inocache; | |
1350 | ||
1351 | case INO_STATE_READING: | |
1352 | case INO_STATE_PRESENT: | |
1353 | /* Eep. This should never happen. It can | |
1354 | happen if Linux calls read_inode() again | |
1355 | before clear_inode() has finished though. */ | |
e0d60137 | 1356 | JFFS2_ERROR("Eep. Trying to read_inode #%u when it's already in state %d!\n", ino, f->inocache->state); |
f97117d1 AB |
1357 | /* Fail. That's probably better than allowing it to succeed */ |
1358 | f->inocache = NULL; | |
1359 | break; | |
1360 | ||
1361 | default: | |
1362 | BUG(); | |
1363 | } | |
1364 | } | |
1365 | spin_unlock(&c->inocache_lock); | |
1366 | ||
1367 | if (!f->inocache && ino == 1) { | |
1368 | /* Special case - no root inode on medium */ | |
1369 | f->inocache = jffs2_alloc_inode_cache(); | |
1370 | if (!f->inocache) { | |
e0d60137 | 1371 | JFFS2_ERROR("cannot allocate inocache for root inode\n"); |
f97117d1 AB |
1372 | return -ENOMEM; |
1373 | } | |
733802d9 | 1374 | dbg_readinode("creating inocache for root inode\n"); |
f97117d1 | 1375 | memset(f->inocache, 0, sizeof(struct jffs2_inode_cache)); |
27c72b04 | 1376 | f->inocache->ino = f->inocache->pino_nlink = 1; |
f97117d1 AB |
1377 | f->inocache->nodes = (struct jffs2_raw_node_ref *)f->inocache; |
1378 | f->inocache->state = INO_STATE_READING; | |
1379 | jffs2_add_ino_cache(c, f->inocache); | |
1380 | } | |
1381 | if (!f->inocache) { | |
e0d60137 | 1382 | JFFS2_ERROR("requestied to read an nonexistent ino %u\n", ino); |
f97117d1 AB |
1383 | return -ENOENT; |
1384 | } | |
1385 | ||
1386 | return jffs2_do_read_inode_internal(c, f, latest_node); | |
1387 | } | |
1388 | ||
1389 | int jffs2_do_crccheck_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) | |
1390 | { | |
1391 | struct jffs2_raw_inode n; | |
3d375d9e | 1392 | struct jffs2_inode_info *f = kzalloc(sizeof(*f), GFP_KERNEL); |
f97117d1 AB |
1393 | int ret; |
1394 | ||
1395 | if (!f) | |
1396 | return -ENOMEM; | |
1397 | ||
ced22070 DW |
1398 | mutex_init(&f->sem); |
1399 | mutex_lock(&f->sem); | |
f97117d1 AB |
1400 | f->inocache = ic; |
1401 | ||
1402 | ret = jffs2_do_read_inode_internal(c, f, &n); | |
1403 | if (!ret) { | |
ced22070 | 1404 | mutex_unlock(&f->sem); |
f97117d1 AB |
1405 | jffs2_do_clear_inode(c, f); |
1406 | } | |
8c5a0366 | 1407 | jffs2_xattr_do_crccheck_inode(c, ic); |
f97117d1 AB |
1408 | kfree (f); |
1409 | return ret; | |
1410 | } | |
1411 | ||
1da177e4 LT |
1412 | void jffs2_do_clear_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f) |
1413 | { | |
1414 | struct jffs2_full_dirent *fd, *fds; | |
1415 | int deleted; | |
1416 | ||
355ed4e1 | 1417 | jffs2_xattr_delete_inode(c, f->inocache); |
ced22070 | 1418 | mutex_lock(&f->sem); |
27c72b04 | 1419 | deleted = f->inocache && !f->inocache->pino_nlink; |
1da177e4 | 1420 | |
67e345d1 DW |
1421 | if (f->inocache && f->inocache->state != INO_STATE_CHECKING) |
1422 | jffs2_set_inocache_state(c, f->inocache, INO_STATE_CLEARING); | |
1423 | ||
1da177e4 LT |
1424 | if (f->metadata) { |
1425 | if (deleted) | |
1426 | jffs2_mark_node_obsolete(c, f->metadata->raw); | |
1427 | jffs2_free_full_dnode(f->metadata); | |
1428 | } | |
1429 | ||
1430 | jffs2_kill_fragtree(&f->fragtree, deleted?c:NULL); | |
1431 | ||
2b79adcc AB |
1432 | if (f->target) { |
1433 | kfree(f->target); | |
1434 | f->target = NULL; | |
1435 | } | |
182ec4ee | 1436 | |
2b79adcc AB |
1437 | fds = f->dents; |
1438 | while(fds) { | |
1439 | fd = fds; | |
1440 | fds = fd->next; | |
1441 | jffs2_free_full_dirent(fd); | |
1da177e4 LT |
1442 | } |
1443 | ||
67e345d1 | 1444 | if (f->inocache && f->inocache->state != INO_STATE_CHECKING) { |
1da177e4 | 1445 | jffs2_set_inocache_state(c, f->inocache, INO_STATE_CHECKEDABSENT); |
67e345d1 DW |
1446 | if (f->inocache->nodes == (void *)f->inocache) |
1447 | jffs2_del_ino_cache(c, f->inocache); | |
1448 | } | |
1da177e4 | 1449 | |
ced22070 | 1450 | mutex_unlock(&f->sem); |
1da177e4 | 1451 | } |