Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/hfsplus/bnode.c | |
3 | * | |
4 | * Copyright (C) 2001 | |
5 | * Brad Boyer (flar@allandria.com) | |
6 | * (C) 2003 Ardis Technologies <roman@ardistech.com> | |
7 | * | |
8 | * Handle basic btree node operations | |
9 | */ | |
10 | ||
11 | #include <linux/string.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/pagemap.h> | |
14 | #include <linux/fs.h> | |
15 | #include <linux/swap.h> | |
1da177e4 LT |
16 | |
17 | #include "hfsplus_fs.h" | |
18 | #include "hfsplus_raw.h" | |
19 | ||
1da177e4 LT |
20 | /* Copy a specified range of bytes from the raw data of a node */ |
21 | void hfs_bnode_read(struct hfs_bnode *node, void *buf, int off, int len) | |
22 | { | |
23 | struct page **pagep; | |
24 | int l; | |
25 | ||
26 | off += node->page_offset; | |
27 | pagep = node->page + (off >> PAGE_CACHE_SHIFT); | |
28 | off &= ~PAGE_CACHE_MASK; | |
29 | ||
30 | l = min(len, (int)PAGE_CACHE_SIZE - off); | |
31 | memcpy(buf, kmap(*pagep) + off, l); | |
32 | kunmap(*pagep); | |
33 | ||
34 | while ((len -= l) != 0) { | |
35 | buf += l; | |
36 | l = min(len, (int)PAGE_CACHE_SIZE); | |
37 | memcpy(buf, kmap(*++pagep), l); | |
38 | kunmap(*pagep); | |
39 | } | |
40 | } | |
41 | ||
42 | u16 hfs_bnode_read_u16(struct hfs_bnode *node, int off) | |
43 | { | |
44 | __be16 data; | |
21f2296a | 45 | /* TODO: optimize later... */ |
1da177e4 LT |
46 | hfs_bnode_read(node, &data, off, 2); |
47 | return be16_to_cpu(data); | |
48 | } | |
49 | ||
50 | u8 hfs_bnode_read_u8(struct hfs_bnode *node, int off) | |
51 | { | |
52 | u8 data; | |
21f2296a | 53 | /* TODO: optimize later... */ |
1da177e4 LT |
54 | hfs_bnode_read(node, &data, off, 1); |
55 | return data; | |
56 | } | |
57 | ||
58 | void hfs_bnode_read_key(struct hfs_bnode *node, void *key, int off) | |
59 | { | |
60 | struct hfs_btree *tree; | |
61 | int key_len; | |
62 | ||
63 | tree = node->tree; | |
64 | if (node->type == HFS_NODE_LEAF || | |
324ef39a VD |
65 | tree->attributes & HFS_TREE_VARIDXKEYS || |
66 | node->tree->cnid == HFSPLUS_ATTR_CNID) | |
1da177e4 LT |
67 | key_len = hfs_bnode_read_u16(node, off) + 2; |
68 | else | |
69 | key_len = tree->max_key_len + 2; | |
70 | ||
71 | hfs_bnode_read(node, key, off, key_len); | |
72 | } | |
73 | ||
74 | void hfs_bnode_write(struct hfs_bnode *node, void *buf, int off, int len) | |
75 | { | |
76 | struct page **pagep; | |
77 | int l; | |
78 | ||
79 | off += node->page_offset; | |
80 | pagep = node->page + (off >> PAGE_CACHE_SHIFT); | |
81 | off &= ~PAGE_CACHE_MASK; | |
82 | ||
83 | l = min(len, (int)PAGE_CACHE_SIZE - off); | |
84 | memcpy(kmap(*pagep) + off, buf, l); | |
85 | set_page_dirty(*pagep); | |
86 | kunmap(*pagep); | |
87 | ||
88 | while ((len -= l) != 0) { | |
89 | buf += l; | |
90 | l = min(len, (int)PAGE_CACHE_SIZE); | |
91 | memcpy(kmap(*++pagep), buf, l); | |
92 | set_page_dirty(*pagep); | |
93 | kunmap(*pagep); | |
94 | } | |
95 | } | |
96 | ||
97 | void hfs_bnode_write_u16(struct hfs_bnode *node, int off, u16 data) | |
98 | { | |
99 | __be16 v = cpu_to_be16(data); | |
21f2296a | 100 | /* TODO: optimize later... */ |
1da177e4 LT |
101 | hfs_bnode_write(node, &v, off, 2); |
102 | } | |
103 | ||
104 | void hfs_bnode_clear(struct hfs_bnode *node, int off, int len) | |
105 | { | |
106 | struct page **pagep; | |
107 | int l; | |
108 | ||
109 | off += node->page_offset; | |
110 | pagep = node->page + (off >> PAGE_CACHE_SHIFT); | |
111 | off &= ~PAGE_CACHE_MASK; | |
112 | ||
113 | l = min(len, (int)PAGE_CACHE_SIZE - off); | |
114 | memset(kmap(*pagep) + off, 0, l); | |
115 | set_page_dirty(*pagep); | |
116 | kunmap(*pagep); | |
117 | ||
118 | while ((len -= l) != 0) { | |
119 | l = min(len, (int)PAGE_CACHE_SIZE); | |
120 | memset(kmap(*++pagep), 0, l); | |
121 | set_page_dirty(*pagep); | |
122 | kunmap(*pagep); | |
123 | } | |
124 | } | |
125 | ||
126 | void hfs_bnode_copy(struct hfs_bnode *dst_node, int dst, | |
127 | struct hfs_bnode *src_node, int src, int len) | |
128 | { | |
129 | struct hfs_btree *tree; | |
130 | struct page **src_page, **dst_page; | |
131 | int l; | |
132 | ||
c2b3e1f7 | 133 | hfs_dbg(BNODE_MOD, "copybytes: %u,%u,%u\n", dst, src, len); |
1da177e4 LT |
134 | if (!len) |
135 | return; | |
136 | tree = src_node->tree; | |
137 | src += src_node->page_offset; | |
138 | dst += dst_node->page_offset; | |
139 | src_page = src_node->page + (src >> PAGE_CACHE_SHIFT); | |
140 | src &= ~PAGE_CACHE_MASK; | |
141 | dst_page = dst_node->page + (dst >> PAGE_CACHE_SHIFT); | |
142 | dst &= ~PAGE_CACHE_MASK; | |
143 | ||
144 | if (src == dst) { | |
145 | l = min(len, (int)PAGE_CACHE_SIZE - src); | |
146 | memcpy(kmap(*dst_page) + src, kmap(*src_page) + src, l); | |
147 | kunmap(*src_page); | |
148 | set_page_dirty(*dst_page); | |
149 | kunmap(*dst_page); | |
150 | ||
151 | while ((len -= l) != 0) { | |
152 | l = min(len, (int)PAGE_CACHE_SIZE); | |
153 | memcpy(kmap(*++dst_page), kmap(*++src_page), l); | |
154 | kunmap(*src_page); | |
155 | set_page_dirty(*dst_page); | |
156 | kunmap(*dst_page); | |
157 | } | |
158 | } else { | |
159 | void *src_ptr, *dst_ptr; | |
160 | ||
161 | do { | |
162 | src_ptr = kmap(*src_page) + src; | |
163 | dst_ptr = kmap(*dst_page) + dst; | |
164 | if (PAGE_CACHE_SIZE - src < PAGE_CACHE_SIZE - dst) { | |
165 | l = PAGE_CACHE_SIZE - src; | |
166 | src = 0; | |
167 | dst += l; | |
168 | } else { | |
169 | l = PAGE_CACHE_SIZE - dst; | |
170 | src += l; | |
171 | dst = 0; | |
172 | } | |
173 | l = min(len, l); | |
174 | memcpy(dst_ptr, src_ptr, l); | |
175 | kunmap(*src_page); | |
176 | set_page_dirty(*dst_page); | |
177 | kunmap(*dst_page); | |
178 | if (!dst) | |
179 | dst_page++; | |
180 | else | |
181 | src_page++; | |
182 | } while ((len -= l)); | |
183 | } | |
184 | } | |
185 | ||
186 | void hfs_bnode_move(struct hfs_bnode *node, int dst, int src, int len) | |
187 | { | |
188 | struct page **src_page, **dst_page; | |
189 | int l; | |
190 | ||
c2b3e1f7 | 191 | hfs_dbg(BNODE_MOD, "movebytes: %u,%u,%u\n", dst, src, len); |
1da177e4 LT |
192 | if (!len) |
193 | return; | |
194 | src += node->page_offset; | |
195 | dst += node->page_offset; | |
196 | if (dst > src) { | |
197 | src += len - 1; | |
198 | src_page = node->page + (src >> PAGE_CACHE_SHIFT); | |
199 | src = (src & ~PAGE_CACHE_MASK) + 1; | |
200 | dst += len - 1; | |
201 | dst_page = node->page + (dst >> PAGE_CACHE_SHIFT); | |
202 | dst = (dst & ~PAGE_CACHE_MASK) + 1; | |
203 | ||
204 | if (src == dst) { | |
205 | while (src < len) { | |
206 | memmove(kmap(*dst_page), kmap(*src_page), src); | |
207 | kunmap(*src_page); | |
208 | set_page_dirty(*dst_page); | |
209 | kunmap(*dst_page); | |
210 | len -= src; | |
211 | src = PAGE_CACHE_SIZE; | |
212 | src_page--; | |
213 | dst_page--; | |
214 | } | |
215 | src -= len; | |
2753cc28 AS |
216 | memmove(kmap(*dst_page) + src, |
217 | kmap(*src_page) + src, len); | |
1da177e4 LT |
218 | kunmap(*src_page); |
219 | set_page_dirty(*dst_page); | |
220 | kunmap(*dst_page); | |
221 | } else { | |
222 | void *src_ptr, *dst_ptr; | |
223 | ||
224 | do { | |
225 | src_ptr = kmap(*src_page) + src; | |
226 | dst_ptr = kmap(*dst_page) + dst; | |
227 | if (src < dst) { | |
228 | l = src; | |
229 | src = PAGE_CACHE_SIZE; | |
230 | dst -= l; | |
231 | } else { | |
232 | l = dst; | |
233 | src -= l; | |
234 | dst = PAGE_CACHE_SIZE; | |
235 | } | |
236 | l = min(len, l); | |
237 | memmove(dst_ptr - l, src_ptr - l, l); | |
238 | kunmap(*src_page); | |
239 | set_page_dirty(*dst_page); | |
240 | kunmap(*dst_page); | |
241 | if (dst == PAGE_CACHE_SIZE) | |
242 | dst_page--; | |
243 | else | |
244 | src_page--; | |
245 | } while ((len -= l)); | |
246 | } | |
247 | } else { | |
248 | src_page = node->page + (src >> PAGE_CACHE_SHIFT); | |
249 | src &= ~PAGE_CACHE_MASK; | |
250 | dst_page = node->page + (dst >> PAGE_CACHE_SHIFT); | |
251 | dst &= ~PAGE_CACHE_MASK; | |
252 | ||
253 | if (src == dst) { | |
254 | l = min(len, (int)PAGE_CACHE_SIZE - src); | |
2753cc28 AS |
255 | memmove(kmap(*dst_page) + src, |
256 | kmap(*src_page) + src, l); | |
1da177e4 LT |
257 | kunmap(*src_page); |
258 | set_page_dirty(*dst_page); | |
259 | kunmap(*dst_page); | |
260 | ||
261 | while ((len -= l) != 0) { | |
262 | l = min(len, (int)PAGE_CACHE_SIZE); | |
2753cc28 AS |
263 | memmove(kmap(*++dst_page), |
264 | kmap(*++src_page), l); | |
1da177e4 LT |
265 | kunmap(*src_page); |
266 | set_page_dirty(*dst_page); | |
267 | kunmap(*dst_page); | |
268 | } | |
269 | } else { | |
270 | void *src_ptr, *dst_ptr; | |
271 | ||
272 | do { | |
273 | src_ptr = kmap(*src_page) + src; | |
274 | dst_ptr = kmap(*dst_page) + dst; | |
2753cc28 AS |
275 | if (PAGE_CACHE_SIZE - src < |
276 | PAGE_CACHE_SIZE - dst) { | |
1da177e4 LT |
277 | l = PAGE_CACHE_SIZE - src; |
278 | src = 0; | |
279 | dst += l; | |
280 | } else { | |
281 | l = PAGE_CACHE_SIZE - dst; | |
282 | src += l; | |
283 | dst = 0; | |
284 | } | |
285 | l = min(len, l); | |
286 | memmove(dst_ptr, src_ptr, l); | |
287 | kunmap(*src_page); | |
288 | set_page_dirty(*dst_page); | |
289 | kunmap(*dst_page); | |
290 | if (!dst) | |
291 | dst_page++; | |
292 | else | |
293 | src_page++; | |
294 | } while ((len -= l)); | |
295 | } | |
296 | } | |
297 | } | |
298 | ||
299 | void hfs_bnode_dump(struct hfs_bnode *node) | |
300 | { | |
301 | struct hfs_bnode_desc desc; | |
302 | __be32 cnid; | |
303 | int i, off, key_off; | |
304 | ||
c2b3e1f7 | 305 | hfs_dbg(BNODE_MOD, "bnode: %d\n", node->this); |
1da177e4 | 306 | hfs_bnode_read(node, &desc, 0, sizeof(desc)); |
c2b3e1f7 | 307 | hfs_dbg(BNODE_MOD, "%d, %d, %d, %d, %d\n", |
1da177e4 LT |
308 | be32_to_cpu(desc.next), be32_to_cpu(desc.prev), |
309 | desc.type, desc.height, be16_to_cpu(desc.num_recs)); | |
310 | ||
311 | off = node->tree->node_size - 2; | |
312 | for (i = be16_to_cpu(desc.num_recs); i >= 0; off -= 2, i--) { | |
313 | key_off = hfs_bnode_read_u16(node, off); | |
c2b3e1f7 | 314 | hfs_dbg(BNODE_MOD, " %d", key_off); |
1da177e4 LT |
315 | if (i && node->type == HFS_NODE_INDEX) { |
316 | int tmp; | |
317 | ||
324ef39a VD |
318 | if (node->tree->attributes & HFS_TREE_VARIDXKEYS || |
319 | node->tree->cnid == HFSPLUS_ATTR_CNID) | |
1da177e4 LT |
320 | tmp = hfs_bnode_read_u16(node, key_off) + 2; |
321 | else | |
322 | tmp = node->tree->max_key_len + 2; | |
c2b3e1f7 | 323 | hfs_dbg_cont(BNODE_MOD, " (%d", tmp); |
1da177e4 | 324 | hfs_bnode_read(node, &cnid, key_off + tmp, 4); |
c2b3e1f7 | 325 | hfs_dbg_cont(BNODE_MOD, ",%d)", be32_to_cpu(cnid)); |
1da177e4 LT |
326 | } else if (i && node->type == HFS_NODE_LEAF) { |
327 | int tmp; | |
328 | ||
329 | tmp = hfs_bnode_read_u16(node, key_off); | |
c2b3e1f7 | 330 | hfs_dbg_cont(BNODE_MOD, " (%d)", tmp); |
1da177e4 LT |
331 | } |
332 | } | |
c2b3e1f7 | 333 | hfs_dbg_cont(BNODE_MOD, "\n"); |
1da177e4 LT |
334 | } |
335 | ||
336 | void hfs_bnode_unlink(struct hfs_bnode *node) | |
337 | { | |
338 | struct hfs_btree *tree; | |
339 | struct hfs_bnode *tmp; | |
340 | __be32 cnid; | |
341 | ||
342 | tree = node->tree; | |
343 | if (node->prev) { | |
344 | tmp = hfs_bnode_find(tree, node->prev); | |
345 | if (IS_ERR(tmp)) | |
346 | return; | |
347 | tmp->next = node->next; | |
348 | cnid = cpu_to_be32(tmp->next); | |
2753cc28 AS |
349 | hfs_bnode_write(tmp, &cnid, |
350 | offsetof(struct hfs_bnode_desc, next), 4); | |
1da177e4 LT |
351 | hfs_bnode_put(tmp); |
352 | } else if (node->type == HFS_NODE_LEAF) | |
353 | tree->leaf_head = node->next; | |
354 | ||
355 | if (node->next) { | |
356 | tmp = hfs_bnode_find(tree, node->next); | |
357 | if (IS_ERR(tmp)) | |
358 | return; | |
359 | tmp->prev = node->prev; | |
360 | cnid = cpu_to_be32(tmp->prev); | |
2753cc28 AS |
361 | hfs_bnode_write(tmp, &cnid, |
362 | offsetof(struct hfs_bnode_desc, prev), 4); | |
1da177e4 LT |
363 | hfs_bnode_put(tmp); |
364 | } else if (node->type == HFS_NODE_LEAF) | |
365 | tree->leaf_tail = node->prev; | |
366 | ||
21f2296a | 367 | /* move down? */ |
b2837fcf | 368 | if (!node->prev && !node->next) |
c2b3e1f7 | 369 | hfs_dbg(BNODE_MOD, "hfs_btree_del_level\n"); |
1da177e4 LT |
370 | if (!node->parent) { |
371 | tree->root = 0; | |
372 | tree->depth = 0; | |
373 | } | |
374 | set_bit(HFS_BNODE_DELETED, &node->flags); | |
375 | } | |
376 | ||
377 | static inline int hfs_bnode_hash(u32 num) | |
378 | { | |
379 | num = (num >> 16) + num; | |
380 | num += num >> 8; | |
381 | return num & (NODE_HASH_SIZE - 1); | |
382 | } | |
383 | ||
384 | struct hfs_bnode *hfs_bnode_findhash(struct hfs_btree *tree, u32 cnid) | |
385 | { | |
386 | struct hfs_bnode *node; | |
387 | ||
388 | if (cnid >= tree->node_count) { | |
d6142673 | 389 | pr_err("request for non-existent node " |
2753cc28 AS |
390 | "%d in B*Tree\n", |
391 | cnid); | |
1da177e4 LT |
392 | return NULL; |
393 | } | |
394 | ||
395 | for (node = tree->node_hash[hfs_bnode_hash(cnid)]; | |
b2837fcf AS |
396 | node; node = node->next_hash) |
397 | if (node->this == cnid) | |
1da177e4 | 398 | return node; |
1da177e4 LT |
399 | return NULL; |
400 | } | |
401 | ||
402 | static struct hfs_bnode *__hfs_bnode_create(struct hfs_btree *tree, u32 cnid) | |
403 | { | |
404 | struct super_block *sb; | |
405 | struct hfs_bnode *node, *node2; | |
406 | struct address_space *mapping; | |
407 | struct page *page; | |
408 | int size, block, i, hash; | |
409 | loff_t off; | |
410 | ||
411 | if (cnid >= tree->node_count) { | |
d6142673 | 412 | pr_err("request for non-existent node " |
2753cc28 AS |
413 | "%d in B*Tree\n", |
414 | cnid); | |
1da177e4 LT |
415 | return NULL; |
416 | } | |
417 | ||
418 | sb = tree->inode->i_sb; | |
419 | size = sizeof(struct hfs_bnode) + tree->pages_per_bnode * | |
420 | sizeof(struct page *); | |
f8314dc6 | 421 | node = kzalloc(size, GFP_KERNEL); |
1da177e4 LT |
422 | if (!node) |
423 | return NULL; | |
1da177e4 LT |
424 | node->tree = tree; |
425 | node->this = cnid; | |
426 | set_bit(HFS_BNODE_NEW, &node->flags); | |
427 | atomic_set(&node->refcnt, 1); | |
c2b3e1f7 JP |
428 | hfs_dbg(BNODE_REFS, "new_node(%d:%d): 1\n", |
429 | node->tree->cnid, node->this); | |
1da177e4 LT |
430 | init_waitqueue_head(&node->lock_wq); |
431 | spin_lock(&tree->hash_lock); | |
432 | node2 = hfs_bnode_findhash(tree, cnid); | |
433 | if (!node2) { | |
434 | hash = hfs_bnode_hash(cnid); | |
435 | node->next_hash = tree->node_hash[hash]; | |
436 | tree->node_hash[hash] = node; | |
437 | tree->node_hash_cnt++; | |
438 | } else { | |
439 | spin_unlock(&tree->hash_lock); | |
440 | kfree(node); | |
2753cc28 AS |
441 | wait_event(node2->lock_wq, |
442 | !test_bit(HFS_BNODE_NEW, &node2->flags)); | |
1da177e4 LT |
443 | return node2; |
444 | } | |
445 | spin_unlock(&tree->hash_lock); | |
446 | ||
447 | mapping = tree->inode->i_mapping; | |
448 | off = (loff_t)cnid << tree->node_size_shift; | |
449 | block = off >> PAGE_CACHE_SHIFT; | |
450 | node->page_offset = off & ~PAGE_CACHE_MASK; | |
451 | for (i = 0; i < tree->pages_per_bnode; block++, i++) { | |
090d2b18 | 452 | page = read_mapping_page(mapping, block, NULL); |
1da177e4 LT |
453 | if (IS_ERR(page)) |
454 | goto fail; | |
455 | if (PageError(page)) { | |
456 | page_cache_release(page); | |
457 | goto fail; | |
458 | } | |
1da177e4 LT |
459 | node->page[i] = page; |
460 | } | |
461 | ||
462 | return node; | |
463 | fail: | |
464 | set_bit(HFS_BNODE_ERROR, &node->flags); | |
465 | return node; | |
466 | } | |
467 | ||
468 | void hfs_bnode_unhash(struct hfs_bnode *node) | |
469 | { | |
470 | struct hfs_bnode **p; | |
471 | ||
c2b3e1f7 | 472 | hfs_dbg(BNODE_REFS, "remove_node(%d:%d): %d\n", |
1da177e4 LT |
473 | node->tree->cnid, node->this, atomic_read(&node->refcnt)); |
474 | for (p = &node->tree->node_hash[hfs_bnode_hash(node->this)]; | |
475 | *p && *p != node; p = &(*p)->next_hash) | |
476 | ; | |
0bf3ba53 | 477 | BUG_ON(!*p); |
1da177e4 LT |
478 | *p = node->next_hash; |
479 | node->tree->node_hash_cnt--; | |
480 | } | |
481 | ||
482 | /* Load a particular node out of a tree */ | |
483 | struct hfs_bnode *hfs_bnode_find(struct hfs_btree *tree, u32 num) | |
484 | { | |
485 | struct hfs_bnode *node; | |
486 | struct hfs_bnode_desc *desc; | |
487 | int i, rec_off, off, next_off; | |
488 | int entry_size, key_size; | |
489 | ||
490 | spin_lock(&tree->hash_lock); | |
491 | node = hfs_bnode_findhash(tree, num); | |
492 | if (node) { | |
493 | hfs_bnode_get(node); | |
494 | spin_unlock(&tree->hash_lock); | |
2753cc28 AS |
495 | wait_event(node->lock_wq, |
496 | !test_bit(HFS_BNODE_NEW, &node->flags)); | |
1da177e4 LT |
497 | if (test_bit(HFS_BNODE_ERROR, &node->flags)) |
498 | goto node_error; | |
499 | return node; | |
500 | } | |
501 | spin_unlock(&tree->hash_lock); | |
502 | node = __hfs_bnode_create(tree, num); | |
503 | if (!node) | |
504 | return ERR_PTR(-ENOMEM); | |
505 | if (test_bit(HFS_BNODE_ERROR, &node->flags)) | |
506 | goto node_error; | |
507 | if (!test_bit(HFS_BNODE_NEW, &node->flags)) | |
508 | return node; | |
509 | ||
2753cc28 AS |
510 | desc = (struct hfs_bnode_desc *)(kmap(node->page[0]) + |
511 | node->page_offset); | |
1da177e4 LT |
512 | node->prev = be32_to_cpu(desc->prev); |
513 | node->next = be32_to_cpu(desc->next); | |
514 | node->num_recs = be16_to_cpu(desc->num_recs); | |
515 | node->type = desc->type; | |
516 | node->height = desc->height; | |
517 | kunmap(node->page[0]); | |
518 | ||
519 | switch (node->type) { | |
520 | case HFS_NODE_HEADER: | |
521 | case HFS_NODE_MAP: | |
522 | if (node->height != 0) | |
523 | goto node_error; | |
524 | break; | |
525 | case HFS_NODE_LEAF: | |
526 | if (node->height != 1) | |
527 | goto node_error; | |
528 | break; | |
529 | case HFS_NODE_INDEX: | |
530 | if (node->height <= 1 || node->height > tree->depth) | |
531 | goto node_error; | |
532 | break; | |
533 | default: | |
534 | goto node_error; | |
535 | } | |
536 | ||
537 | rec_off = tree->node_size - 2; | |
538 | off = hfs_bnode_read_u16(node, rec_off); | |
539 | if (off != sizeof(struct hfs_bnode_desc)) | |
540 | goto node_error; | |
541 | for (i = 1; i <= node->num_recs; off = next_off, i++) { | |
542 | rec_off -= 2; | |
543 | next_off = hfs_bnode_read_u16(node, rec_off); | |
544 | if (next_off <= off || | |
545 | next_off > tree->node_size || | |
546 | next_off & 1) | |
547 | goto node_error; | |
548 | entry_size = next_off - off; | |
549 | if (node->type != HFS_NODE_INDEX && | |
550 | node->type != HFS_NODE_LEAF) | |
551 | continue; | |
552 | key_size = hfs_bnode_read_u16(node, off) + 2; | |
553 | if (key_size >= entry_size || key_size & 1) | |
554 | goto node_error; | |
555 | } | |
556 | clear_bit(HFS_BNODE_NEW, &node->flags); | |
557 | wake_up(&node->lock_wq); | |
558 | return node; | |
559 | ||
560 | node_error: | |
561 | set_bit(HFS_BNODE_ERROR, &node->flags); | |
562 | clear_bit(HFS_BNODE_NEW, &node->flags); | |
563 | wake_up(&node->lock_wq); | |
564 | hfs_bnode_put(node); | |
565 | return ERR_PTR(-EIO); | |
566 | } | |
567 | ||
568 | void hfs_bnode_free(struct hfs_bnode *node) | |
569 | { | |
21f2296a | 570 | int i; |
1da177e4 | 571 | |
21f2296a AS |
572 | for (i = 0; i < node->tree->pages_per_bnode; i++) |
573 | if (node->page[i]) | |
574 | page_cache_release(node->page[i]); | |
1da177e4 LT |
575 | kfree(node); |
576 | } | |
577 | ||
578 | struct hfs_bnode *hfs_bnode_create(struct hfs_btree *tree, u32 num) | |
579 | { | |
580 | struct hfs_bnode *node; | |
581 | struct page **pagep; | |
582 | int i; | |
583 | ||
584 | spin_lock(&tree->hash_lock); | |
585 | node = hfs_bnode_findhash(tree, num); | |
586 | spin_unlock(&tree->hash_lock); | |
587 | if (node) { | |
d6142673 | 588 | pr_crit("new node %u already hashed?\n", num); |
634725a9 RZ |
589 | WARN_ON(1); |
590 | return node; | |
1da177e4 LT |
591 | } |
592 | node = __hfs_bnode_create(tree, num); | |
593 | if (!node) | |
594 | return ERR_PTR(-ENOMEM); | |
595 | if (test_bit(HFS_BNODE_ERROR, &node->flags)) { | |
596 | hfs_bnode_put(node); | |
597 | return ERR_PTR(-EIO); | |
598 | } | |
599 | ||
600 | pagep = node->page; | |
601 | memset(kmap(*pagep) + node->page_offset, 0, | |
602 | min((int)PAGE_CACHE_SIZE, (int)tree->node_size)); | |
603 | set_page_dirty(*pagep); | |
604 | kunmap(*pagep); | |
605 | for (i = 1; i < tree->pages_per_bnode; i++) { | |
606 | memset(kmap(*++pagep), 0, PAGE_CACHE_SIZE); | |
607 | set_page_dirty(*pagep); | |
608 | kunmap(*pagep); | |
609 | } | |
610 | clear_bit(HFS_BNODE_NEW, &node->flags); | |
611 | wake_up(&node->lock_wq); | |
612 | ||
613 | return node; | |
614 | } | |
615 | ||
616 | void hfs_bnode_get(struct hfs_bnode *node) | |
617 | { | |
618 | if (node) { | |
619 | atomic_inc(&node->refcnt); | |
c2b3e1f7 | 620 | hfs_dbg(BNODE_REFS, "get_node(%d:%d): %d\n", |
2753cc28 AS |
621 | node->tree->cnid, node->this, |
622 | atomic_read(&node->refcnt)); | |
1da177e4 LT |
623 | } |
624 | } | |
625 | ||
626 | /* Dispose of resources used by a node */ | |
627 | void hfs_bnode_put(struct hfs_bnode *node) | |
628 | { | |
629 | if (node) { | |
630 | struct hfs_btree *tree = node->tree; | |
631 | int i; | |
632 | ||
c2b3e1f7 | 633 | hfs_dbg(BNODE_REFS, "put_node(%d:%d): %d\n", |
2753cc28 AS |
634 | node->tree->cnid, node->this, |
635 | atomic_read(&node->refcnt)); | |
0bf3ba53 | 636 | BUG_ON(!atomic_read(&node->refcnt)); |
a5e3985f | 637 | if (!atomic_dec_and_lock(&node->refcnt, &tree->hash_lock)) |
1da177e4 | 638 | return; |
1da177e4 | 639 | for (i = 0; i < tree->pages_per_bnode; i++) { |
74f9c9c2 RZ |
640 | if (!node->page[i]) |
641 | continue; | |
1da177e4 | 642 | mark_page_accessed(node->page[i]); |
1da177e4 LT |
643 | } |
644 | ||
645 | if (test_bit(HFS_BNODE_DELETED, &node->flags)) { | |
646 | hfs_bnode_unhash(node); | |
647 | spin_unlock(&tree->hash_lock); | |
899bed05 VD |
648 | hfs_bnode_clear(node, 0, |
649 | PAGE_CACHE_SIZE * tree->pages_per_bnode); | |
1da177e4 LT |
650 | hfs_bmap_free(node); |
651 | hfs_bnode_free(node); | |
652 | return; | |
653 | } | |
654 | spin_unlock(&tree->hash_lock); | |
655 | } | |
656 | } | |
657 |