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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 | * | |
7d200960 | 10 | * $Id: nodelist.c,v 1.94 2005/04/13 13:22:35 dwmw2 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; | |
27 | D1(printk(KERN_DEBUG "jffs2_add_fd_to_list( %p, %p (->%p))\n", new, list, *list)); | |
28 | ||
29 | while ((*prev) && (*prev)->nhash <= new->nhash) { | |
30 | if ((*prev)->nhash == new->nhash && !strcmp((*prev)->name, new->name)) { | |
31 | /* Duplicate. Free one */ | |
32 | if (new->version < (*prev)->version) { | |
33 | D1(printk(KERN_DEBUG "Eep! Marking new dirent node obsolete\n")); | |
34 | D1(printk(KERN_DEBUG "New dirent is \"%s\"->ino #%u. Old is \"%s\"->ino #%u\n", new->name, new->ino, (*prev)->name, (*prev)->ino)); | |
35 | jffs2_mark_node_obsolete(c, new->raw); | |
36 | jffs2_free_full_dirent(new); | |
37 | } else { | |
38 | D1(printk(KERN_DEBUG "Marking old dirent node (ino #%u) obsolete\n", (*prev)->ino)); | |
39 | new->next = (*prev)->next; | |
40 | jffs2_mark_node_obsolete(c, ((*prev)->raw)); | |
41 | jffs2_free_full_dirent(*prev); | |
42 | *prev = new; | |
43 | } | |
44 | goto out; | |
45 | } | |
46 | prev = &((*prev)->next); | |
47 | } | |
48 | new->next = *prev; | |
49 | *prev = new; | |
50 | ||
51 | out: | |
52 | D2(while(*list) { | |
53 | printk(KERN_DEBUG "Dirent \"%s\" (hash 0x%08x, ino #%u\n", (*list)->name, (*list)->nhash, (*list)->ino); | |
54 | list = &(*list)->next; | |
55 | }); | |
56 | } | |
57 | ||
58 | /* Put a new tmp_dnode_info into the list, keeping the list in | |
59 | order of increasing version | |
60 | */ | |
61 | static void jffs2_add_tn_to_list(struct jffs2_tmp_dnode_info *tn, struct jffs2_tmp_dnode_info **list) | |
62 | { | |
63 | struct jffs2_tmp_dnode_info **prev = list; | |
64 | ||
65 | while ((*prev) && (*prev)->version < tn->version) { | |
66 | prev = &((*prev)->next); | |
67 | } | |
68 | tn->next = (*prev); | |
69 | *prev = tn; | |
70 | } | |
71 | ||
72 | static void jffs2_free_tmp_dnode_info_list(struct jffs2_tmp_dnode_info *tn) | |
73 | { | |
74 | struct jffs2_tmp_dnode_info *next; | |
75 | ||
76 | while (tn) { | |
77 | next = tn; | |
78 | tn = tn->next; | |
79 | jffs2_free_full_dnode(next->fn); | |
80 | jffs2_free_tmp_dnode_info(next); | |
81 | } | |
82 | } | |
83 | ||
84 | static void jffs2_free_full_dirent_list(struct jffs2_full_dirent *fd) | |
85 | { | |
86 | struct jffs2_full_dirent *next; | |
87 | ||
88 | while (fd) { | |
89 | next = fd->next; | |
90 | jffs2_free_full_dirent(fd); | |
91 | fd = next; | |
92 | } | |
93 | } | |
94 | ||
95 | /* Returns first valid node after 'ref'. May return 'ref' */ | |
96 | static struct jffs2_raw_node_ref *jffs2_first_valid_node(struct jffs2_raw_node_ref *ref) | |
97 | { | |
98 | while (ref && ref->next_in_ino) { | |
99 | if (!ref_obsolete(ref)) | |
100 | return ref; | |
101 | D1(printk(KERN_DEBUG "node at 0x%08x is obsoleted. Ignoring.\n", ref_offset(ref))); | |
102 | ref = ref->next_in_ino; | |
103 | } | |
104 | return NULL; | |
105 | } | |
106 | ||
107 | /* Get tmp_dnode_info and full_dirent for all non-obsolete nodes associated | |
108 | with this ino, returning the former in order of version */ | |
109 | ||
110 | int jffs2_get_inode_nodes(struct jffs2_sb_info *c, struct jffs2_inode_info *f, | |
111 | struct jffs2_tmp_dnode_info **tnp, struct jffs2_full_dirent **fdp, | |
112 | uint32_t *highest_version, uint32_t *latest_mctime, | |
113 | uint32_t *mctime_ver) | |
114 | { | |
115 | struct jffs2_raw_node_ref *ref, *valid_ref; | |
116 | struct jffs2_tmp_dnode_info *tn, *ret_tn = NULL; | |
117 | struct jffs2_full_dirent *fd, *ret_fd = NULL; | |
118 | union jffs2_node_union node; | |
119 | size_t retlen; | |
120 | int err; | |
121 | ||
122 | *mctime_ver = 0; | |
123 | ||
124 | D1(printk(KERN_DEBUG "jffs2_get_inode_nodes(): ino #%u\n", f->inocache->ino)); | |
125 | ||
126 | spin_lock(&c->erase_completion_lock); | |
127 | ||
128 | valid_ref = jffs2_first_valid_node(f->inocache->nodes); | |
129 | ||
8fabed4a | 130 | if (!valid_ref && (f->inocache->ino != 1)) |
1da177e4 LT |
131 | printk(KERN_WARNING "Eep. No valid nodes for ino #%u\n", f->inocache->ino); |
132 | ||
133 | while (valid_ref) { | |
134 | /* We can hold a pointer to a non-obsolete node without the spinlock, | |
135 | but _obsolete_ nodes may disappear at any time, if the block | |
136 | they're in gets erased. So if we mark 'ref' obsolete while we're | |
137 | not holding the lock, it can go away immediately. For that reason, | |
138 | we find the next valid node first, before processing 'ref'. | |
139 | */ | |
140 | ref = valid_ref; | |
141 | valid_ref = jffs2_first_valid_node(ref->next_in_ino); | |
142 | spin_unlock(&c->erase_completion_lock); | |
143 | ||
144 | cond_resched(); | |
145 | ||
146 | /* FIXME: point() */ | |
147 | err = jffs2_flash_read(c, (ref_offset(ref)), | |
148 | min_t(uint32_t, ref_totlen(c, NULL, ref), sizeof(node)), | |
149 | &retlen, (void *)&node); | |
150 | if (err) { | |
151 | printk(KERN_WARNING "error %d reading node at 0x%08x in get_inode_nodes()\n", err, ref_offset(ref)); | |
152 | goto free_out; | |
153 | } | |
154 | ||
155 | ||
156 | /* Check we've managed to read at least the common node header */ | |
157 | if (retlen < min_t(uint32_t, ref_totlen(c, NULL, ref), sizeof(node.u))) { | |
158 | printk(KERN_WARNING "short read in get_inode_nodes()\n"); | |
159 | err = -EIO; | |
160 | goto free_out; | |
161 | } | |
162 | ||
163 | switch (je16_to_cpu(node.u.nodetype)) { | |
164 | case JFFS2_NODETYPE_DIRENT: | |
165 | D1(printk(KERN_DEBUG "Node at %08x (%d) is a dirent node\n", ref_offset(ref), ref_flags(ref))); | |
166 | if (ref_flags(ref) == REF_UNCHECKED) { | |
167 | printk(KERN_WARNING "BUG: Dirent node at 0x%08x never got checked? How?\n", ref_offset(ref)); | |
168 | BUG(); | |
169 | } | |
170 | if (retlen < sizeof(node.d)) { | |
171 | printk(KERN_WARNING "short read in get_inode_nodes()\n"); | |
172 | err = -EIO; | |
173 | goto free_out; | |
174 | } | |
175 | /* sanity check */ | |
176 | if (PAD((node.d.nsize + sizeof (node.d))) != PAD(je32_to_cpu (node.d.totlen))) { | |
177 | printk(KERN_NOTICE "jffs2_get_inode_nodes(): Illegal nsize in node at 0x%08x: nsize 0x%02x, totlen %04x\n", | |
178 | ref_offset(ref), node.d.nsize, je32_to_cpu(node.d.totlen)); | |
179 | jffs2_mark_node_obsolete(c, ref); | |
180 | spin_lock(&c->erase_completion_lock); | |
181 | continue; | |
182 | } | |
183 | if (je32_to_cpu(node.d.version) > *highest_version) | |
184 | *highest_version = je32_to_cpu(node.d.version); | |
185 | if (ref_obsolete(ref)) { | |
186 | /* Obsoleted. This cannot happen, surely? dwmw2 20020308 */ | |
187 | printk(KERN_ERR "Dirent node at 0x%08x became obsolete while we weren't looking\n", | |
188 | ref_offset(ref)); | |
189 | BUG(); | |
190 | } | |
191 | ||
192 | fd = jffs2_alloc_full_dirent(node.d.nsize+1); | |
193 | if (!fd) { | |
194 | err = -ENOMEM; | |
195 | goto free_out; | |
196 | } | |
197 | fd->raw = ref; | |
198 | fd->version = je32_to_cpu(node.d.version); | |
199 | fd->ino = je32_to_cpu(node.d.ino); | |
200 | fd->type = node.d.type; | |
201 | ||
202 | /* Pick out the mctime of the latest dirent */ | |
203 | if(fd->version > *mctime_ver) { | |
204 | *mctime_ver = fd->version; | |
205 | *latest_mctime = je32_to_cpu(node.d.mctime); | |
206 | } | |
207 | ||
208 | /* memcpy as much of the name as possible from the raw | |
209 | dirent we've already read from the flash | |
210 | */ | |
211 | if (retlen > sizeof(struct jffs2_raw_dirent)) | |
212 | memcpy(&fd->name[0], &node.d.name[0], min_t(uint32_t, node.d.nsize, (retlen-sizeof(struct jffs2_raw_dirent)))); | |
213 | ||
214 | /* Do we need to copy any more of the name directly | |
215 | from the flash? | |
216 | */ | |
217 | if (node.d.nsize + sizeof(struct jffs2_raw_dirent) > retlen) { | |
218 | /* FIXME: point() */ | |
219 | int already = retlen - sizeof(struct jffs2_raw_dirent); | |
220 | ||
221 | err = jffs2_flash_read(c, (ref_offset(ref)) + retlen, | |
222 | node.d.nsize - already, &retlen, &fd->name[already]); | |
223 | if (!err && retlen != node.d.nsize - already) | |
224 | err = -EIO; | |
225 | ||
226 | if (err) { | |
227 | printk(KERN_WARNING "Read remainder of name in jffs2_get_inode_nodes(): error %d\n", err); | |
228 | jffs2_free_full_dirent(fd); | |
229 | goto free_out; | |
230 | } | |
231 | } | |
232 | fd->nhash = full_name_hash(fd->name, node.d.nsize); | |
233 | fd->next = NULL; | |
234 | fd->name[node.d.nsize] = '\0'; | |
235 | /* Wheee. We now have a complete jffs2_full_dirent structure, with | |
236 | the name in it and everything. Link it into the list | |
237 | */ | |
238 | D1(printk(KERN_DEBUG "Adding fd \"%s\", ino #%u\n", fd->name, fd->ino)); | |
239 | jffs2_add_fd_to_list(c, fd, &ret_fd); | |
240 | break; | |
241 | ||
242 | case JFFS2_NODETYPE_INODE: | |
243 | D1(printk(KERN_DEBUG "Node at %08x (%d) is a data node\n", ref_offset(ref), ref_flags(ref))); | |
244 | if (retlen < sizeof(node.i)) { | |
245 | printk(KERN_WARNING "read too short for dnode\n"); | |
246 | err = -EIO; | |
247 | goto free_out; | |
248 | } | |
249 | if (je32_to_cpu(node.i.version) > *highest_version) | |
250 | *highest_version = je32_to_cpu(node.i.version); | |
251 | D1(printk(KERN_DEBUG "version %d, highest_version now %d\n", je32_to_cpu(node.i.version), *highest_version)); | |
252 | ||
253 | if (ref_obsolete(ref)) { | |
254 | /* Obsoleted. This cannot happen, surely? dwmw2 20020308 */ | |
255 | printk(KERN_ERR "Inode node at 0x%08x became obsolete while we weren't looking\n", | |
256 | ref_offset(ref)); | |
257 | BUG(); | |
258 | } | |
259 | ||
260 | /* If we've never checked the CRCs on this node, check them now. */ | |
261 | if (ref_flags(ref) == REF_UNCHECKED) { | |
262 | uint32_t crc, len; | |
263 | struct jffs2_eraseblock *jeb; | |
264 | ||
265 | crc = crc32(0, &node, sizeof(node.i)-8); | |
266 | if (crc != je32_to_cpu(node.i.node_crc)) { | |
267 | printk(KERN_NOTICE "jffs2_get_inode_nodes(): CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n", | |
268 | ref_offset(ref), je32_to_cpu(node.i.node_crc), crc); | |
269 | jffs2_mark_node_obsolete(c, ref); | |
270 | spin_lock(&c->erase_completion_lock); | |
271 | continue; | |
272 | } | |
273 | ||
274 | /* sanity checks */ | |
275 | if ( je32_to_cpu(node.i.offset) > je32_to_cpu(node.i.isize) || | |
276 | PAD(je32_to_cpu(node.i.csize) + sizeof (node.i)) != PAD(je32_to_cpu(node.i.totlen))) { | |
277 | printk(KERN_NOTICE "jffs2_get_inode_nodes(): Inode corrupted at 0x%08x, totlen %d, #ino %d, version %d, isize %d, csize %d, dsize %d \n", | |
278 | ref_offset(ref), je32_to_cpu(node.i.totlen), je32_to_cpu(node.i.ino), | |
279 | je32_to_cpu(node.i.version), je32_to_cpu(node.i.isize), | |
280 | je32_to_cpu(node.i.csize), je32_to_cpu(node.i.dsize)); | |
281 | jffs2_mark_node_obsolete(c, ref); | |
282 | spin_lock(&c->erase_completion_lock); | |
283 | continue; | |
284 | } | |
285 | ||
286 | if (node.i.compr != JFFS2_COMPR_ZERO && je32_to_cpu(node.i.csize)) { | |
287 | unsigned char *buf=NULL; | |
288 | uint32_t pointed = 0; | |
289 | #ifndef __ECOS | |
290 | if (c->mtd->point) { | |
291 | err = c->mtd->point (c->mtd, ref_offset(ref) + sizeof(node.i), je32_to_cpu(node.i.csize), | |
292 | &retlen, &buf); | |
293 | if (!err && retlen < je32_to_cpu(node.i.csize)) { | |
294 | D1(printk(KERN_DEBUG "MTD point returned len too short: 0x%zx\n", retlen)); | |
295 | c->mtd->unpoint(c->mtd, buf, ref_offset(ref) + sizeof(node.i), je32_to_cpu(node.i.csize)); | |
296 | } else if (err){ | |
297 | D1(printk(KERN_DEBUG "MTD point failed %d\n", err)); | |
298 | } else | |
299 | pointed = 1; /* succefully pointed to device */ | |
300 | } | |
301 | #endif | |
302 | if(!pointed){ | |
303 | buf = kmalloc(je32_to_cpu(node.i.csize), GFP_KERNEL); | |
304 | if (!buf) | |
305 | return -ENOMEM; | |
306 | ||
307 | err = jffs2_flash_read(c, ref_offset(ref) + sizeof(node.i), je32_to_cpu(node.i.csize), | |
308 | &retlen, buf); | |
309 | if (!err && retlen != je32_to_cpu(node.i.csize)) | |
310 | err = -EIO; | |
311 | if (err) { | |
312 | kfree(buf); | |
313 | return err; | |
314 | } | |
315 | } | |
316 | crc = crc32(0, buf, je32_to_cpu(node.i.csize)); | |
317 | if(!pointed) | |
318 | kfree(buf); | |
319 | #ifndef __ECOS | |
320 | else | |
321 | c->mtd->unpoint(c->mtd, buf, ref_offset(ref) + sizeof(node.i), je32_to_cpu(node.i.csize)); | |
322 | #endif | |
323 | ||
324 | if (crc != je32_to_cpu(node.i.data_crc)) { | |
325 | printk(KERN_NOTICE "jffs2_get_inode_nodes(): Data CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n", | |
326 | ref_offset(ref), je32_to_cpu(node.i.data_crc), crc); | |
327 | jffs2_mark_node_obsolete(c, ref); | |
328 | spin_lock(&c->erase_completion_lock); | |
329 | continue; | |
330 | } | |
331 | ||
332 | } | |
333 | ||
334 | /* Mark the node as having been checked and fix the accounting accordingly */ | |
335 | spin_lock(&c->erase_completion_lock); | |
336 | jeb = &c->blocks[ref->flash_offset / c->sector_size]; | |
337 | len = ref_totlen(c, jeb, ref); | |
338 | ||
339 | jeb->used_size += len; | |
340 | jeb->unchecked_size -= len; | |
341 | c->used_size += len; | |
342 | c->unchecked_size -= len; | |
343 | ||
344 | /* If node covers at least a whole page, or if it starts at the | |
345 | beginning of a page and runs to the end of the file, or if | |
346 | it's a hole node, mark it REF_PRISTINE, else REF_NORMAL. | |
347 | ||
348 | If it's actually overlapped, it'll get made NORMAL (or OBSOLETE) | |
349 | when the overlapping node(s) get added to the tree anyway. | |
350 | */ | |
351 | if ((je32_to_cpu(node.i.dsize) >= PAGE_CACHE_SIZE) || | |
352 | ( ((je32_to_cpu(node.i.offset)&(PAGE_CACHE_SIZE-1))==0) && | |
353 | (je32_to_cpu(node.i.dsize)+je32_to_cpu(node.i.offset) == je32_to_cpu(node.i.isize)))) { | |
354 | D1(printk(KERN_DEBUG "Marking node at 0x%08x REF_PRISTINE\n", ref_offset(ref))); | |
355 | ref->flash_offset = ref_offset(ref) | REF_PRISTINE; | |
356 | } else { | |
357 | D1(printk(KERN_DEBUG "Marking node at 0x%08x REF_NORMAL\n", ref_offset(ref))); | |
358 | ref->flash_offset = ref_offset(ref) | REF_NORMAL; | |
359 | } | |
360 | spin_unlock(&c->erase_completion_lock); | |
361 | } | |
362 | ||
363 | tn = jffs2_alloc_tmp_dnode_info(); | |
364 | if (!tn) { | |
365 | D1(printk(KERN_DEBUG "alloc tn failed\n")); | |
366 | err = -ENOMEM; | |
367 | goto free_out; | |
368 | } | |
369 | ||
370 | tn->fn = jffs2_alloc_full_dnode(); | |
371 | if (!tn->fn) { | |
372 | D1(printk(KERN_DEBUG "alloc fn failed\n")); | |
373 | err = -ENOMEM; | |
374 | jffs2_free_tmp_dnode_info(tn); | |
375 | goto free_out; | |
376 | } | |
377 | tn->version = je32_to_cpu(node.i.version); | |
378 | tn->fn->ofs = je32_to_cpu(node.i.offset); | |
379 | /* There was a bug where we wrote hole nodes out with | |
380 | csize/dsize swapped. Deal with it */ | |
381 | if (node.i.compr == JFFS2_COMPR_ZERO && !je32_to_cpu(node.i.dsize) && je32_to_cpu(node.i.csize)) | |
382 | tn->fn->size = je32_to_cpu(node.i.csize); | |
383 | else // normal case... | |
384 | tn->fn->size = je32_to_cpu(node.i.dsize); | |
385 | tn->fn->raw = ref; | |
386 | D1(printk(KERN_DEBUG "dnode @%08x: ver %u, offset %04x, dsize %04x\n", | |
387 | ref_offset(ref), je32_to_cpu(node.i.version), | |
388 | je32_to_cpu(node.i.offset), je32_to_cpu(node.i.dsize))); | |
389 | jffs2_add_tn_to_list(tn, &ret_tn); | |
390 | break; | |
391 | ||
392 | default: | |
393 | if (ref_flags(ref) == REF_UNCHECKED) { | |
394 | struct jffs2_eraseblock *jeb; | |
395 | uint32_t len; | |
396 | ||
397 | printk(KERN_ERR "Eep. Unknown node type %04x at %08x was marked REF_UNCHECKED\n", | |
398 | je16_to_cpu(node.u.nodetype), ref_offset(ref)); | |
399 | ||
400 | /* Mark the node as having been checked and fix the accounting accordingly */ | |
401 | spin_lock(&c->erase_completion_lock); | |
402 | jeb = &c->blocks[ref->flash_offset / c->sector_size]; | |
403 | len = ref_totlen(c, jeb, ref); | |
404 | ||
405 | jeb->used_size += len; | |
406 | jeb->unchecked_size -= len; | |
407 | c->used_size += len; | |
408 | c->unchecked_size -= len; | |
409 | ||
410 | mark_ref_normal(ref); | |
411 | spin_unlock(&c->erase_completion_lock); | |
412 | } | |
413 | node.u.nodetype = cpu_to_je16(JFFS2_NODE_ACCURATE | je16_to_cpu(node.u.nodetype)); | |
414 | if (crc32(0, &node, sizeof(struct jffs2_unknown_node)-4) != je32_to_cpu(node.u.hdr_crc)) { | |
415 | /* Hmmm. This should have been caught at scan time. */ | |
416 | printk(KERN_ERR "Node header CRC failed at %08x. But it must have been OK earlier.\n", | |
417 | ref_offset(ref)); | |
418 | printk(KERN_ERR "Node was: { %04x, %04x, %08x, %08x }\n", | |
419 | je16_to_cpu(node.u.magic), je16_to_cpu(node.u.nodetype), je32_to_cpu(node.u.totlen), | |
420 | je32_to_cpu(node.u.hdr_crc)); | |
421 | jffs2_mark_node_obsolete(c, ref); | |
422 | } else switch(je16_to_cpu(node.u.nodetype) & JFFS2_COMPAT_MASK) { | |
423 | case JFFS2_FEATURE_INCOMPAT: | |
424 | printk(KERN_NOTICE "Unknown INCOMPAT nodetype %04X at %08x\n", je16_to_cpu(node.u.nodetype), ref_offset(ref)); | |
425 | /* EEP */ | |
426 | BUG(); | |
427 | break; | |
428 | case JFFS2_FEATURE_ROCOMPAT: | |
429 | printk(KERN_NOTICE "Unknown ROCOMPAT nodetype %04X at %08x\n", je16_to_cpu(node.u.nodetype), ref_offset(ref)); | |
430 | if (!(c->flags & JFFS2_SB_FLAG_RO)) | |
431 | BUG(); | |
432 | break; | |
433 | case JFFS2_FEATURE_RWCOMPAT_COPY: | |
434 | printk(KERN_NOTICE "Unknown RWCOMPAT_COPY nodetype %04X at %08x\n", je16_to_cpu(node.u.nodetype), ref_offset(ref)); | |
435 | break; | |
436 | case JFFS2_FEATURE_RWCOMPAT_DELETE: | |
437 | printk(KERN_NOTICE "Unknown RWCOMPAT_DELETE nodetype %04X at %08x\n", je16_to_cpu(node.u.nodetype), ref_offset(ref)); | |
438 | jffs2_mark_node_obsolete(c, ref); | |
439 | break; | |
440 | } | |
441 | ||
442 | } | |
443 | spin_lock(&c->erase_completion_lock); | |
444 | ||
445 | } | |
446 | spin_unlock(&c->erase_completion_lock); | |
447 | *tnp = ret_tn; | |
448 | *fdp = ret_fd; | |
449 | ||
450 | return 0; | |
451 | ||
452 | free_out: | |
453 | jffs2_free_tmp_dnode_info_list(ret_tn); | |
454 | jffs2_free_full_dirent_list(ret_fd); | |
455 | return err; | |
456 | } | |
457 | ||
458 | void jffs2_set_inocache_state(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic, int state) | |
459 | { | |
460 | spin_lock(&c->inocache_lock); | |
461 | ic->state = state; | |
462 | wake_up(&c->inocache_wq); | |
463 | spin_unlock(&c->inocache_lock); | |
464 | } | |
465 | ||
466 | /* During mount, this needs no locking. During normal operation, its | |
467 | callers want to do other stuff while still holding the inocache_lock. | |
468 | Rather than introducing special case get_ino_cache functions or | |
469 | callbacks, we just let the caller do the locking itself. */ | |
470 | ||
471 | struct jffs2_inode_cache *jffs2_get_ino_cache(struct jffs2_sb_info *c, uint32_t ino) | |
472 | { | |
473 | struct jffs2_inode_cache *ret; | |
474 | ||
475 | D2(printk(KERN_DEBUG "jffs2_get_ino_cache(): ino %u\n", ino)); | |
476 | ||
477 | ret = c->inocache_list[ino % INOCACHE_HASHSIZE]; | |
478 | while (ret && ret->ino < ino) { | |
479 | ret = ret->next; | |
480 | } | |
481 | ||
482 | if (ret && ret->ino != ino) | |
483 | ret = NULL; | |
484 | ||
485 | D2(printk(KERN_DEBUG "jffs2_get_ino_cache found %p for ino %u\n", ret, ino)); | |
486 | return ret; | |
487 | } | |
488 | ||
489 | void jffs2_add_ino_cache (struct jffs2_sb_info *c, struct jffs2_inode_cache *new) | |
490 | { | |
491 | struct jffs2_inode_cache **prev; | |
492 | D2(printk(KERN_DEBUG "jffs2_add_ino_cache: Add %p (ino #%u)\n", new, new->ino)); | |
493 | spin_lock(&c->inocache_lock); | |
7d200960 DW |
494 | if (!new->ino) |
495 | new->ino = ++c->highest_ino; | |
496 | ||
497 | D2(printk(KERN_DEBUG "jffs2_add_ino_cache: Add %p (ino #%u)\n", new, new->ino)); | |
1da177e4 LT |
498 | |
499 | prev = &c->inocache_list[new->ino % INOCACHE_HASHSIZE]; | |
500 | ||
501 | while ((*prev) && (*prev)->ino < new->ino) { | |
502 | prev = &(*prev)->next; | |
503 | } | |
504 | new->next = *prev; | |
505 | *prev = new; | |
506 | ||
507 | spin_unlock(&c->inocache_lock); | |
508 | } | |
509 | ||
510 | void jffs2_del_ino_cache(struct jffs2_sb_info *c, struct jffs2_inode_cache *old) | |
511 | { | |
512 | struct jffs2_inode_cache **prev; | |
67e345d1 | 513 | D1(printk(KERN_DEBUG "jffs2_del_ino_cache: Del %p (ino #%u)\n", old, old->ino)); |
1da177e4 LT |
514 | spin_lock(&c->inocache_lock); |
515 | ||
516 | prev = &c->inocache_list[old->ino % INOCACHE_HASHSIZE]; | |
517 | ||
518 | while ((*prev) && (*prev)->ino < old->ino) { | |
519 | prev = &(*prev)->next; | |
520 | } | |
521 | if ((*prev) == old) { | |
522 | *prev = old->next; | |
523 | } | |
524 | ||
67e345d1 DW |
525 | /* Free it now unless it's in READING or CLEARING state, which |
526 | are the transitions upon read_inode() and clear_inode(). The | |
527 | rest of the time we know nobody else is looking at it, and | |
528 | if it's held by read_inode() or clear_inode() they'll free it | |
529 | for themselves. */ | |
530 | if (old->state != INO_STATE_READING && old->state != INO_STATE_CLEARING) | |
531 | jffs2_free_inode_cache(old); | |
532 | ||
1da177e4 LT |
533 | spin_unlock(&c->inocache_lock); |
534 | } | |
535 | ||
536 | void jffs2_free_ino_caches(struct jffs2_sb_info *c) | |
537 | { | |
538 | int i; | |
539 | struct jffs2_inode_cache *this, *next; | |
540 | ||
541 | for (i=0; i<INOCACHE_HASHSIZE; i++) { | |
542 | this = c->inocache_list[i]; | |
543 | while (this) { | |
544 | next = this->next; | |
1da177e4 LT |
545 | jffs2_free_inode_cache(this); |
546 | this = next; | |
547 | } | |
548 | c->inocache_list[i] = NULL; | |
549 | } | |
550 | } | |
551 | ||
552 | void jffs2_free_raw_node_refs(struct jffs2_sb_info *c) | |
553 | { | |
554 | int i; | |
555 | struct jffs2_raw_node_ref *this, *next; | |
556 | ||
557 | for (i=0; i<c->nr_blocks; i++) { | |
558 | this = c->blocks[i].first_node; | |
559 | while(this) { | |
560 | next = this->next_phys; | |
561 | jffs2_free_raw_node_ref(this); | |
562 | this = next; | |
563 | } | |
564 | c->blocks[i].first_node = c->blocks[i].last_node = NULL; | |
565 | } | |
566 | } | |
567 | ||
568 | struct jffs2_node_frag *jffs2_lookup_node_frag(struct rb_root *fragtree, uint32_t offset) | |
569 | { | |
570 | /* The common case in lookup is that there will be a node | |
571 | which precisely matches. So we go looking for that first */ | |
572 | struct rb_node *next; | |
573 | struct jffs2_node_frag *prev = NULL; | |
574 | struct jffs2_node_frag *frag = NULL; | |
575 | ||
576 | D2(printk(KERN_DEBUG "jffs2_lookup_node_frag(%p, %d)\n", fragtree, offset)); | |
577 | ||
578 | next = fragtree->rb_node; | |
579 | ||
580 | while(next) { | |
581 | frag = rb_entry(next, struct jffs2_node_frag, rb); | |
582 | ||
583 | D2(printk(KERN_DEBUG "Considering frag %d-%d (%p). left %p, right %p\n", | |
584 | frag->ofs, frag->ofs+frag->size, frag, frag->rb.rb_left, frag->rb.rb_right)); | |
585 | if (frag->ofs + frag->size <= offset) { | |
586 | D2(printk(KERN_DEBUG "Going right from frag %d-%d, before the region we care about\n", | |
587 | frag->ofs, frag->ofs+frag->size)); | |
588 | /* Remember the closest smaller match on the way down */ | |
589 | if (!prev || frag->ofs > prev->ofs) | |
590 | prev = frag; | |
591 | next = frag->rb.rb_right; | |
592 | } else if (frag->ofs > offset) { | |
593 | D2(printk(KERN_DEBUG "Going left from frag %d-%d, after the region we care about\n", | |
594 | frag->ofs, frag->ofs+frag->size)); | |
595 | next = frag->rb.rb_left; | |
596 | } else { | |
597 | D2(printk(KERN_DEBUG "Returning frag %d,%d, matched\n", | |
598 | frag->ofs, frag->ofs+frag->size)); | |
599 | return frag; | |
600 | } | |
601 | } | |
602 | ||
603 | /* Exact match not found. Go back up looking at each parent, | |
604 | and return the closest smaller one */ | |
605 | ||
606 | if (prev) | |
607 | D2(printk(KERN_DEBUG "No match. Returning frag %d,%d, closest previous\n", | |
608 | prev->ofs, prev->ofs+prev->size)); | |
609 | else | |
610 | D2(printk(KERN_DEBUG "Returning NULL, empty fragtree\n")); | |
611 | ||
612 | return prev; | |
613 | } | |
614 | ||
615 | /* Pass 'c' argument to indicate that nodes should be marked obsolete as | |
616 | they're killed. */ | |
617 | void jffs2_kill_fragtree(struct rb_root *root, struct jffs2_sb_info *c) | |
618 | { | |
619 | struct jffs2_node_frag *frag; | |
620 | struct jffs2_node_frag *parent; | |
621 | ||
622 | if (!root->rb_node) | |
623 | return; | |
624 | ||
625 | frag = (rb_entry(root->rb_node, struct jffs2_node_frag, rb)); | |
626 | ||
627 | while(frag) { | |
628 | if (frag->rb.rb_left) { | |
629 | D2(printk(KERN_DEBUG "Going left from frag (%p) %d-%d\n", | |
630 | frag, frag->ofs, frag->ofs+frag->size)); | |
631 | frag = frag_left(frag); | |
632 | continue; | |
633 | } | |
634 | if (frag->rb.rb_right) { | |
635 | D2(printk(KERN_DEBUG "Going right from frag (%p) %d-%d\n", | |
636 | frag, frag->ofs, frag->ofs+frag->size)); | |
637 | frag = frag_right(frag); | |
638 | continue; | |
639 | } | |
640 | ||
641 | D2(printk(KERN_DEBUG "jffs2_kill_fragtree: frag at 0x%x-0x%x: node %p, frags %d--\n", | |
642 | frag->ofs, frag->ofs+frag->size, frag->node, | |
643 | frag->node?frag->node->frags:0)); | |
644 | ||
645 | if (frag->node && !(--frag->node->frags)) { | |
646 | /* Not a hole, and it's the final remaining frag | |
647 | of this node. Free the node */ | |
648 | if (c) | |
649 | jffs2_mark_node_obsolete(c, frag->node->raw); | |
650 | ||
651 | jffs2_free_full_dnode(frag->node); | |
652 | } | |
653 | parent = frag_parent(frag); | |
654 | if (parent) { | |
655 | if (frag_left(parent) == frag) | |
656 | parent->rb.rb_left = NULL; | |
657 | else | |
658 | parent->rb.rb_right = NULL; | |
659 | } | |
660 | ||
661 | jffs2_free_node_frag(frag); | |
662 | frag = parent; | |
663 | ||
664 | cond_resched(); | |
665 | } | |
666 | } | |
667 | ||
668 | void jffs2_fragtree_insert(struct jffs2_node_frag *newfrag, struct jffs2_node_frag *base) | |
669 | { | |
670 | struct rb_node *parent = &base->rb; | |
671 | struct rb_node **link = &parent; | |
672 | ||
673 | D2(printk(KERN_DEBUG "jffs2_fragtree_insert(%p; %d-%d, %p)\n", newfrag, | |
674 | newfrag->ofs, newfrag->ofs+newfrag->size, base)); | |
675 | ||
676 | while (*link) { | |
677 | parent = *link; | |
678 | base = rb_entry(parent, struct jffs2_node_frag, rb); | |
679 | ||
680 | D2(printk(KERN_DEBUG "fragtree_insert considering frag at 0x%x\n", base->ofs)); | |
681 | if (newfrag->ofs > base->ofs) | |
682 | link = &base->rb.rb_right; | |
683 | else if (newfrag->ofs < base->ofs) | |
684 | link = &base->rb.rb_left; | |
685 | else { | |
686 | printk(KERN_CRIT "Duplicate frag at %08x (%p,%p)\n", newfrag->ofs, newfrag, base); | |
687 | BUG(); | |
688 | } | |
689 | } | |
690 | ||
691 | rb_link_node(&newfrag->rb, &base->rb, link); | |
692 | } |