Commit | Line | Data |
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5db53f3e JE |
1 | /* |
2 | * fs/logfs/segment.c - Handling the Object Store | |
3 | * | |
4 | * As should be obvious for Linux kernel code, license is GPLv2 | |
5 | * | |
6 | * Copyright (c) 2005-2008 Joern Engel <joern@logfs.org> | |
7 | * | |
8 | * Object store or ostore makes up the complete device with exception of | |
9 | * the superblock and journal areas. Apart from its own metadata it stores | |
10 | * three kinds of objects: inodes, dentries and blocks, both data and indirect. | |
11 | */ | |
12 | #include "logfs.h" | |
13 | ||
14 | static int logfs_mark_segment_bad(struct super_block *sb, u32 segno) | |
15 | { | |
16 | struct logfs_super *super = logfs_super(sb); | |
17 | struct btree_head32 *head = &super->s_reserved_segments; | |
18 | int err; | |
19 | ||
20 | err = btree_insert32(head, segno, (void *)1, GFP_NOFS); | |
21 | if (err) | |
22 | return err; | |
23 | logfs_super(sb)->s_bad_segments++; | |
24 | /* FIXME: write to journal */ | |
25 | return 0; | |
26 | } | |
27 | ||
9421502b | 28 | int logfs_erase_segment(struct super_block *sb, u32 segno, int ensure_erase) |
5db53f3e JE |
29 | { |
30 | struct logfs_super *super = logfs_super(sb); | |
31 | ||
32 | super->s_gec++; | |
33 | ||
34 | return super->s_devops->erase(sb, (u64)segno << super->s_segshift, | |
9421502b | 35 | super->s_segsize, ensure_erase); |
5db53f3e JE |
36 | } |
37 | ||
38 | static s64 logfs_get_free_bytes(struct logfs_area *area, size_t bytes) | |
39 | { | |
40 | s32 ofs; | |
41 | ||
42 | logfs_open_area(area, bytes); | |
43 | ||
44 | ofs = area->a_used_bytes; | |
45 | area->a_used_bytes += bytes; | |
46 | BUG_ON(area->a_used_bytes >= logfs_super(area->a_sb)->s_segsize); | |
47 | ||
48 | return dev_ofs(area->a_sb, area->a_segno, ofs); | |
49 | } | |
50 | ||
51 | static struct page *get_mapping_page(struct super_block *sb, pgoff_t index, | |
52 | int use_filler) | |
53 | { | |
54 | struct logfs_super *super = logfs_super(sb); | |
55 | struct address_space *mapping = super->s_mapping_inode->i_mapping; | |
56 | filler_t *filler = super->s_devops->readpage; | |
57 | struct page *page; | |
58 | ||
59 | BUG_ON(mapping_gfp_mask(mapping) & __GFP_FS); | |
60 | if (use_filler) | |
61 | page = read_cache_page(mapping, index, filler, sb); | |
62 | else { | |
63 | page = find_or_create_page(mapping, index, GFP_NOFS); | |
64 | unlock_page(page); | |
65 | } | |
66 | return page; | |
67 | } | |
68 | ||
69 | void __logfs_buf_write(struct logfs_area *area, u64 ofs, void *buf, size_t len, | |
70 | int use_filler) | |
71 | { | |
72 | pgoff_t index = ofs >> PAGE_SHIFT; | |
73 | struct page *page; | |
74 | long offset = ofs & (PAGE_SIZE-1); | |
75 | long copylen; | |
76 | ||
77 | /* Only logfs_wbuf_recover may use len==0 */ | |
78 | BUG_ON(!len && !use_filler); | |
79 | do { | |
80 | copylen = min((ulong)len, PAGE_SIZE - offset); | |
81 | ||
82 | page = get_mapping_page(area->a_sb, index, use_filler); | |
83 | SetPageUptodate(page); | |
84 | BUG_ON(!page); /* FIXME: reserve a pool */ | |
85 | memcpy(page_address(page) + offset, buf, copylen); | |
86 | SetPagePrivate(page); | |
87 | page_cache_release(page); | |
88 | ||
89 | buf += copylen; | |
90 | len -= copylen; | |
91 | offset = 0; | |
92 | index++; | |
93 | } while (len); | |
94 | } | |
95 | ||
81def6b9 | 96 | static void pad_partial_page(struct logfs_area *area) |
5db53f3e JE |
97 | { |
98 | struct super_block *sb = area->a_sb; | |
5db53f3e JE |
99 | struct page *page; |
100 | u64 ofs = dev_ofs(sb, area->a_segno, area->a_used_bytes); | |
101 | pgoff_t index = ofs >> PAGE_SHIFT; | |
102 | long offset = ofs & (PAGE_SIZE-1); | |
103 | u32 len = PAGE_SIZE - offset; | |
104 | ||
81def6b9 JE |
105 | if (len % PAGE_SIZE) { |
106 | page = get_mapping_page(sb, index, 0); | |
5db53f3e JE |
107 | BUG_ON(!page); /* FIXME: reserve a pool */ |
108 | memset(page_address(page) + offset, 0xff, len); | |
109 | SetPagePrivate(page); | |
110 | page_cache_release(page); | |
111 | } | |
81def6b9 | 112 | } |
5db53f3e | 113 | |
81def6b9 JE |
114 | static void pad_full_pages(struct logfs_area *area) |
115 | { | |
116 | struct super_block *sb = area->a_sb; | |
117 | struct logfs_super *super = logfs_super(sb); | |
118 | u64 ofs = dev_ofs(sb, area->a_segno, area->a_used_bytes); | |
119 | u32 len = super->s_segsize - area->a_used_bytes; | |
120 | pgoff_t index = PAGE_CACHE_ALIGN(ofs) >> PAGE_CACHE_SHIFT; | |
121 | pgoff_t no_indizes = len >> PAGE_CACHE_SHIFT; | |
122 | struct page *page; | |
5db53f3e | 123 | |
81def6b9 JE |
124 | while (no_indizes) { |
125 | page = get_mapping_page(sb, index, 0); | |
5db53f3e | 126 | BUG_ON(!page); /* FIXME: reserve a pool */ |
81def6b9 JE |
127 | SetPageUptodate(page); |
128 | memset(page_address(page), 0xff, PAGE_CACHE_SIZE); | |
5db53f3e JE |
129 | SetPagePrivate(page); |
130 | page_cache_release(page); | |
81def6b9 JE |
131 | index++; |
132 | no_indizes--; | |
5db53f3e JE |
133 | } |
134 | } | |
135 | ||
81def6b9 JE |
136 | /* |
137 | * bdev_writeseg will write full pages. Memset the tail to prevent data leaks. | |
138 | * Also make sure we allocate (and memset) all pages for final writeout. | |
139 | */ | |
140 | static void pad_wbuf(struct logfs_area *area, int final) | |
141 | { | |
142 | pad_partial_page(area); | |
143 | if (final) | |
144 | pad_full_pages(area); | |
145 | } | |
146 | ||
5db53f3e JE |
147 | /* |
148 | * We have to be careful with the alias tree. Since lookup is done by bix, | |
149 | * it needs to be normalized, so 14, 15, 16, etc. all match when dealing with | |
150 | * indirect blocks. So always use it through accessor functions. | |
151 | */ | |
152 | static void *alias_tree_lookup(struct super_block *sb, u64 ino, u64 bix, | |
153 | level_t level) | |
154 | { | |
155 | struct btree_head128 *head = &logfs_super(sb)->s_object_alias_tree; | |
156 | pgoff_t index = logfs_pack_index(bix, level); | |
157 | ||
158 | return btree_lookup128(head, ino, index); | |
159 | } | |
160 | ||
161 | static int alias_tree_insert(struct super_block *sb, u64 ino, u64 bix, | |
162 | level_t level, void *val) | |
163 | { | |
164 | struct btree_head128 *head = &logfs_super(sb)->s_object_alias_tree; | |
165 | pgoff_t index = logfs_pack_index(bix, level); | |
166 | ||
167 | return btree_insert128(head, ino, index, val, GFP_NOFS); | |
168 | } | |
169 | ||
170 | static int btree_write_alias(struct super_block *sb, struct logfs_block *block, | |
171 | write_alias_t *write_one_alias) | |
172 | { | |
173 | struct object_alias_item *item; | |
174 | int err; | |
175 | ||
176 | list_for_each_entry(item, &block->item_list, list) { | |
177 | err = write_alias_journal(sb, block->ino, block->bix, | |
178 | block->level, item->child_no, item->val); | |
179 | if (err) | |
180 | return err; | |
181 | } | |
182 | return 0; | |
183 | } | |
184 | ||
185 | static gc_level_t btree_block_level(struct logfs_block *block) | |
186 | { | |
187 | return expand_level(block->ino, block->level); | |
188 | } | |
189 | ||
190 | static struct logfs_block_ops btree_block_ops = { | |
191 | .write_block = btree_write_block, | |
192 | .block_level = btree_block_level, | |
193 | .free_block = __free_block, | |
194 | .write_alias = btree_write_alias, | |
195 | }; | |
196 | ||
197 | int logfs_load_object_aliases(struct super_block *sb, | |
198 | struct logfs_obj_alias *oa, int count) | |
199 | { | |
200 | struct logfs_super *super = logfs_super(sb); | |
201 | struct logfs_block *block; | |
202 | struct object_alias_item *item; | |
203 | u64 ino, bix; | |
204 | level_t level; | |
205 | int i, err; | |
206 | ||
207 | super->s_flags |= LOGFS_SB_FLAG_OBJ_ALIAS; | |
208 | count /= sizeof(*oa); | |
209 | for (i = 0; i < count; i++) { | |
210 | item = mempool_alloc(super->s_alias_pool, GFP_NOFS); | |
211 | if (!item) | |
212 | return -ENOMEM; | |
213 | memset(item, 0, sizeof(*item)); | |
214 | ||
215 | super->s_no_object_aliases++; | |
216 | item->val = oa[i].val; | |
217 | item->child_no = be16_to_cpu(oa[i].child_no); | |
218 | ||
219 | ino = be64_to_cpu(oa[i].ino); | |
220 | bix = be64_to_cpu(oa[i].bix); | |
221 | level = LEVEL(oa[i].level); | |
222 | ||
223 | log_aliases("logfs_load_object_aliases(%llx, %llx, %x, %x) %llx\n", | |
224 | ino, bix, level, item->child_no, | |
225 | be64_to_cpu(item->val)); | |
226 | block = alias_tree_lookup(sb, ino, bix, level); | |
227 | if (!block) { | |
228 | block = __alloc_block(sb, ino, bix, level); | |
229 | block->ops = &btree_block_ops; | |
230 | err = alias_tree_insert(sb, ino, bix, level, block); | |
231 | BUG_ON(err); /* mempool empty */ | |
232 | } | |
233 | if (test_and_set_bit(item->child_no, block->alias_map)) { | |
234 | printk(KERN_ERR"LogFS: Alias collision detected\n"); | |
235 | return -EIO; | |
236 | } | |
237 | list_move_tail(&block->alias_list, &super->s_object_alias); | |
238 | list_add(&item->list, &block->item_list); | |
239 | } | |
240 | return 0; | |
241 | } | |
242 | ||
243 | static void kill_alias(void *_block, unsigned long ignore0, | |
244 | u64 ignore1, u64 ignore2, size_t ignore3) | |
245 | { | |
246 | struct logfs_block *block = _block; | |
247 | struct super_block *sb = block->sb; | |
248 | struct logfs_super *super = logfs_super(sb); | |
249 | struct object_alias_item *item; | |
250 | ||
251 | while (!list_empty(&block->item_list)) { | |
252 | item = list_entry(block->item_list.next, typeof(*item), list); | |
253 | list_del(&item->list); | |
254 | mempool_free(item, super->s_alias_pool); | |
255 | } | |
256 | block->ops->free_block(sb, block); | |
257 | } | |
258 | ||
259 | static int obj_type(struct inode *inode, level_t level) | |
260 | { | |
261 | if (level == 0) { | |
262 | if (S_ISDIR(inode->i_mode)) | |
263 | return OBJ_DENTRY; | |
264 | if (inode->i_ino == LOGFS_INO_MASTER) | |
265 | return OBJ_INODE; | |
266 | } | |
267 | return OBJ_BLOCK; | |
268 | } | |
269 | ||
270 | static int obj_len(struct super_block *sb, int obj_type) | |
271 | { | |
272 | switch (obj_type) { | |
273 | case OBJ_DENTRY: | |
274 | return sizeof(struct logfs_disk_dentry); | |
275 | case OBJ_INODE: | |
276 | return sizeof(struct logfs_disk_inode); | |
277 | case OBJ_BLOCK: | |
278 | return sb->s_blocksize; | |
279 | default: | |
280 | BUG(); | |
281 | } | |
282 | } | |
283 | ||
284 | static int __logfs_segment_write(struct inode *inode, void *buf, | |
285 | struct logfs_shadow *shadow, int type, int len, int compr) | |
286 | { | |
287 | struct logfs_area *area; | |
288 | struct super_block *sb = inode->i_sb; | |
289 | s64 ofs; | |
290 | struct logfs_object_header h; | |
291 | int acc_len; | |
292 | ||
293 | if (shadow->gc_level == 0) | |
294 | acc_len = len; | |
295 | else | |
296 | acc_len = obj_len(sb, type); | |
297 | ||
298 | area = get_area(sb, shadow->gc_level); | |
299 | ofs = logfs_get_free_bytes(area, len + LOGFS_OBJECT_HEADERSIZE); | |
300 | LOGFS_BUG_ON(ofs <= 0, sb); | |
301 | /* | |
302 | * Order is important. logfs_get_free_bytes(), by modifying the | |
303 | * segment file, may modify the content of the very page we're about | |
304 | * to write now. Which is fine, as long as the calculated crc and | |
305 | * written data still match. So do the modifications _before_ | |
306 | * calculating the crc. | |
307 | */ | |
308 | ||
309 | h.len = cpu_to_be16(len); | |
310 | h.type = type; | |
311 | h.compr = compr; | |
312 | h.ino = cpu_to_be64(inode->i_ino); | |
313 | h.bix = cpu_to_be64(shadow->bix); | |
314 | h.crc = logfs_crc32(&h, sizeof(h) - 4, 4); | |
315 | h.data_crc = logfs_crc32(buf, len, 0); | |
316 | ||
317 | logfs_buf_write(area, ofs, &h, sizeof(h)); | |
318 | logfs_buf_write(area, ofs + LOGFS_OBJECT_HEADERSIZE, buf, len); | |
319 | ||
320 | shadow->new_ofs = ofs; | |
321 | shadow->new_len = acc_len + LOGFS_OBJECT_HEADERSIZE; | |
322 | ||
323 | return 0; | |
324 | } | |
325 | ||
326 | static s64 logfs_segment_write_compress(struct inode *inode, void *buf, | |
327 | struct logfs_shadow *shadow, int type, int len) | |
328 | { | |
329 | struct super_block *sb = inode->i_sb; | |
330 | void *compressor_buf = logfs_super(sb)->s_compressed_je; | |
331 | ssize_t compr_len; | |
332 | int ret; | |
333 | ||
334 | mutex_lock(&logfs_super(sb)->s_journal_mutex); | |
335 | compr_len = logfs_compress(buf, compressor_buf, len, len); | |
336 | ||
337 | if (compr_len >= 0) { | |
338 | ret = __logfs_segment_write(inode, compressor_buf, shadow, | |
339 | type, compr_len, COMPR_ZLIB); | |
340 | } else { | |
341 | ret = __logfs_segment_write(inode, buf, shadow, type, len, | |
342 | COMPR_NONE); | |
343 | } | |
344 | mutex_unlock(&logfs_super(sb)->s_journal_mutex); | |
345 | return ret; | |
346 | } | |
347 | ||
348 | /** | |
349 | * logfs_segment_write - write data block to object store | |
350 | * @inode: inode containing data | |
351 | * | |
352 | * Returns an errno or zero. | |
353 | */ | |
354 | int logfs_segment_write(struct inode *inode, struct page *page, | |
355 | struct logfs_shadow *shadow) | |
356 | { | |
357 | struct super_block *sb = inode->i_sb; | |
358 | struct logfs_super *super = logfs_super(sb); | |
359 | int do_compress, type, len; | |
360 | int ret; | |
361 | void *buf; | |
362 | ||
c6d38301 JE |
363 | super->s_flags |= LOGFS_SB_FLAG_DIRTY; |
364 | BUG_ON(super->s_flags & LOGFS_SB_FLAG_SHUTDOWN); | |
5db53f3e JE |
365 | do_compress = logfs_inode(inode)->li_flags & LOGFS_IF_COMPRESSED; |
366 | if (shadow->gc_level != 0) { | |
367 | /* temporarily disable compression for indirect blocks */ | |
368 | do_compress = 0; | |
369 | } | |
370 | ||
371 | type = obj_type(inode, shrink_level(shadow->gc_level)); | |
372 | len = obj_len(sb, type); | |
373 | buf = kmap(page); | |
374 | if (do_compress) | |
375 | ret = logfs_segment_write_compress(inode, buf, shadow, type, | |
376 | len); | |
377 | else | |
378 | ret = __logfs_segment_write(inode, buf, shadow, type, len, | |
379 | COMPR_NONE); | |
380 | kunmap(page); | |
381 | ||
382 | log_segment("logfs_segment_write(%llx, %llx, %x) %llx->%llx %x->%x\n", | |
383 | shadow->ino, shadow->bix, shadow->gc_level, | |
384 | shadow->old_ofs, shadow->new_ofs, | |
385 | shadow->old_len, shadow->new_len); | |
386 | /* this BUG_ON did catch a locking bug. useful */ | |
387 | BUG_ON(!(shadow->new_ofs & (super->s_segsize - 1))); | |
388 | return ret; | |
389 | } | |
390 | ||
391 | int wbuf_read(struct super_block *sb, u64 ofs, size_t len, void *buf) | |
392 | { | |
393 | pgoff_t index = ofs >> PAGE_SHIFT; | |
394 | struct page *page; | |
395 | long offset = ofs & (PAGE_SIZE-1); | |
396 | long copylen; | |
397 | ||
398 | while (len) { | |
399 | copylen = min((ulong)len, PAGE_SIZE - offset); | |
400 | ||
401 | page = get_mapping_page(sb, index, 1); | |
402 | if (IS_ERR(page)) | |
403 | return PTR_ERR(page); | |
404 | memcpy(buf, page_address(page) + offset, copylen); | |
405 | page_cache_release(page); | |
406 | ||
407 | buf += copylen; | |
408 | len -= copylen; | |
409 | offset = 0; | |
410 | index++; | |
411 | } | |
412 | return 0; | |
413 | } | |
414 | ||
415 | /* | |
416 | * The "position" of indirect blocks is ambiguous. It can be the position | |
417 | * of any data block somewhere behind this indirect block. So we need to | |
418 | * normalize the positions through logfs_block_mask() before comparing. | |
419 | */ | |
420 | static int check_pos(struct super_block *sb, u64 pos1, u64 pos2, level_t level) | |
421 | { | |
422 | return (pos1 & logfs_block_mask(sb, level)) != | |
423 | (pos2 & logfs_block_mask(sb, level)); | |
424 | } | |
425 | ||
426 | #if 0 | |
427 | static int read_seg_header(struct super_block *sb, u64 ofs, | |
428 | struct logfs_segment_header *sh) | |
429 | { | |
430 | __be32 crc; | |
431 | int err; | |
432 | ||
433 | err = wbuf_read(sb, ofs, sizeof(*sh), sh); | |
434 | if (err) | |
435 | return err; | |
436 | crc = logfs_crc32(sh, sizeof(*sh), 4); | |
437 | if (crc != sh->crc) { | |
438 | printk(KERN_ERR"LOGFS: header crc error at %llx: expected %x, " | |
439 | "got %x\n", ofs, be32_to_cpu(sh->crc), | |
440 | be32_to_cpu(crc)); | |
441 | return -EIO; | |
442 | } | |
443 | return 0; | |
444 | } | |
445 | #endif | |
446 | ||
447 | static int read_obj_header(struct super_block *sb, u64 ofs, | |
448 | struct logfs_object_header *oh) | |
449 | { | |
450 | __be32 crc; | |
451 | int err; | |
452 | ||
453 | err = wbuf_read(sb, ofs, sizeof(*oh), oh); | |
454 | if (err) | |
455 | return err; | |
456 | crc = logfs_crc32(oh, sizeof(*oh) - 4, 4); | |
457 | if (crc != oh->crc) { | |
458 | printk(KERN_ERR"LOGFS: header crc error at %llx: expected %x, " | |
459 | "got %x\n", ofs, be32_to_cpu(oh->crc), | |
460 | be32_to_cpu(crc)); | |
461 | return -EIO; | |
462 | } | |
463 | return 0; | |
464 | } | |
465 | ||
466 | static void move_btree_to_page(struct inode *inode, struct page *page, | |
467 | __be64 *data) | |
468 | { | |
469 | struct super_block *sb = inode->i_sb; | |
470 | struct logfs_super *super = logfs_super(sb); | |
471 | struct btree_head128 *head = &super->s_object_alias_tree; | |
472 | struct logfs_block *block; | |
473 | struct object_alias_item *item, *next; | |
474 | ||
475 | if (!(super->s_flags & LOGFS_SB_FLAG_OBJ_ALIAS)) | |
476 | return; | |
477 | ||
478 | block = btree_remove128(head, inode->i_ino, page->index); | |
479 | if (!block) | |
480 | return; | |
481 | ||
482 | log_blockmove("move_btree_to_page(%llx, %llx, %x)\n", | |
483 | block->ino, block->bix, block->level); | |
484 | list_for_each_entry_safe(item, next, &block->item_list, list) { | |
485 | data[item->child_no] = item->val; | |
486 | list_del(&item->list); | |
487 | mempool_free(item, super->s_alias_pool); | |
488 | } | |
489 | block->page = page; | |
490 | SetPagePrivate(page); | |
491 | page->private = (unsigned long)block; | |
492 | block->ops = &indirect_block_ops; | |
493 | initialize_block_counters(page, block, data, 0); | |
494 | } | |
495 | ||
496 | /* | |
497 | * This silences a false, yet annoying gcc warning. I hate it when my editor | |
498 | * jumps into bitops.h each time I recompile this file. | |
499 | * TODO: Complain to gcc folks about this and upgrade compiler. | |
500 | */ | |
501 | static unsigned long fnb(const unsigned long *addr, | |
502 | unsigned long size, unsigned long offset) | |
503 | { | |
504 | return find_next_bit(addr, size, offset); | |
505 | } | |
506 | ||
507 | void move_page_to_btree(struct page *page) | |
508 | { | |
509 | struct logfs_block *block = logfs_block(page); | |
510 | struct super_block *sb = block->sb; | |
511 | struct logfs_super *super = logfs_super(sb); | |
512 | struct object_alias_item *item; | |
513 | unsigned long pos; | |
514 | __be64 *child; | |
515 | int err; | |
516 | ||
517 | if (super->s_flags & LOGFS_SB_FLAG_SHUTDOWN) { | |
518 | block->ops->free_block(sb, block); | |
519 | return; | |
520 | } | |
521 | log_blockmove("move_page_to_btree(%llx, %llx, %x)\n", | |
522 | block->ino, block->bix, block->level); | |
523 | super->s_flags |= LOGFS_SB_FLAG_OBJ_ALIAS; | |
524 | ||
525 | for (pos = 0; ; pos++) { | |
526 | pos = fnb(block->alias_map, LOGFS_BLOCK_FACTOR, pos); | |
527 | if (pos >= LOGFS_BLOCK_FACTOR) | |
528 | break; | |
529 | ||
530 | item = mempool_alloc(super->s_alias_pool, GFP_NOFS); | |
531 | BUG_ON(!item); /* mempool empty */ | |
532 | memset(item, 0, sizeof(*item)); | |
533 | ||
534 | child = kmap_atomic(page, KM_USER0); | |
535 | item->val = child[pos]; | |
536 | kunmap_atomic(child, KM_USER0); | |
537 | item->child_no = pos; | |
538 | list_add(&item->list, &block->item_list); | |
539 | } | |
540 | block->page = NULL; | |
541 | ClearPagePrivate(page); | |
542 | page->private = 0; | |
543 | block->ops = &btree_block_ops; | |
544 | err = alias_tree_insert(block->sb, block->ino, block->bix, block->level, | |
545 | block); | |
546 | BUG_ON(err); /* mempool empty */ | |
547 | ClearPageUptodate(page); | |
548 | } | |
549 | ||
550 | static int __logfs_segment_read(struct inode *inode, void *buf, | |
551 | u64 ofs, u64 bix, level_t level) | |
552 | { | |
553 | struct super_block *sb = inode->i_sb; | |
554 | void *compressor_buf = logfs_super(sb)->s_compressed_je; | |
555 | struct logfs_object_header oh; | |
556 | __be32 crc; | |
557 | u16 len; | |
558 | int err, block_len; | |
559 | ||
560 | block_len = obj_len(sb, obj_type(inode, level)); | |
561 | err = read_obj_header(sb, ofs, &oh); | |
562 | if (err) | |
563 | goto out_err; | |
564 | ||
565 | err = -EIO; | |
566 | if (be64_to_cpu(oh.ino) != inode->i_ino | |
567 | || check_pos(sb, be64_to_cpu(oh.bix), bix, level)) { | |
568 | printk(KERN_ERR"LOGFS: (ino, bix) don't match at %llx: " | |
569 | "expected (%lx, %llx), got (%llx, %llx)\n", | |
570 | ofs, inode->i_ino, bix, | |
571 | be64_to_cpu(oh.ino), be64_to_cpu(oh.bix)); | |
572 | goto out_err; | |
573 | } | |
574 | ||
575 | len = be16_to_cpu(oh.len); | |
576 | ||
577 | switch (oh.compr) { | |
578 | case COMPR_NONE: | |
579 | err = wbuf_read(sb, ofs + LOGFS_OBJECT_HEADERSIZE, len, buf); | |
580 | if (err) | |
581 | goto out_err; | |
582 | crc = logfs_crc32(buf, len, 0); | |
583 | if (crc != oh.data_crc) { | |
584 | printk(KERN_ERR"LOGFS: uncompressed data crc error at " | |
585 | "%llx: expected %x, got %x\n", ofs, | |
586 | be32_to_cpu(oh.data_crc), | |
587 | be32_to_cpu(crc)); | |
588 | goto out_err; | |
589 | } | |
590 | break; | |
591 | case COMPR_ZLIB: | |
592 | mutex_lock(&logfs_super(sb)->s_journal_mutex); | |
593 | err = wbuf_read(sb, ofs + LOGFS_OBJECT_HEADERSIZE, len, | |
594 | compressor_buf); | |
595 | if (err) { | |
596 | mutex_unlock(&logfs_super(sb)->s_journal_mutex); | |
597 | goto out_err; | |
598 | } | |
599 | crc = logfs_crc32(compressor_buf, len, 0); | |
600 | if (crc != oh.data_crc) { | |
601 | printk(KERN_ERR"LOGFS: compressed data crc error at " | |
602 | "%llx: expected %x, got %x\n", ofs, | |
603 | be32_to_cpu(oh.data_crc), | |
604 | be32_to_cpu(crc)); | |
605 | mutex_unlock(&logfs_super(sb)->s_journal_mutex); | |
606 | goto out_err; | |
607 | } | |
608 | err = logfs_uncompress(compressor_buf, buf, len, block_len); | |
609 | mutex_unlock(&logfs_super(sb)->s_journal_mutex); | |
610 | if (err) { | |
611 | printk(KERN_ERR"LOGFS: uncompress error at %llx\n", ofs); | |
612 | goto out_err; | |
613 | } | |
614 | break; | |
615 | default: | |
616 | LOGFS_BUG(sb); | |
617 | err = -EIO; | |
618 | goto out_err; | |
619 | } | |
620 | return 0; | |
621 | ||
622 | out_err: | |
623 | logfs_set_ro(sb); | |
624 | printk(KERN_ERR"LOGFS: device is read-only now\n"); | |
625 | LOGFS_BUG(sb); | |
626 | return err; | |
627 | } | |
628 | ||
629 | /** | |
630 | * logfs_segment_read - read data block from object store | |
631 | * @inode: inode containing data | |
632 | * @buf: data buffer | |
633 | * @ofs: physical data offset | |
634 | * @bix: block index | |
635 | * @level: block level | |
636 | * | |
637 | * Returns 0 on success or a negative errno. | |
638 | */ | |
639 | int logfs_segment_read(struct inode *inode, struct page *page, | |
640 | u64 ofs, u64 bix, level_t level) | |
641 | { | |
642 | int err; | |
643 | void *buf; | |
644 | ||
645 | if (PageUptodate(page)) | |
646 | return 0; | |
647 | ||
648 | ofs &= ~LOGFS_FULLY_POPULATED; | |
649 | ||
650 | buf = kmap(page); | |
651 | err = __logfs_segment_read(inode, buf, ofs, bix, level); | |
652 | if (!err) { | |
653 | move_btree_to_page(inode, page, buf); | |
654 | SetPageUptodate(page); | |
655 | } | |
656 | kunmap(page); | |
657 | log_segment("logfs_segment_read(%lx, %llx, %x) %llx (%d)\n", | |
658 | inode->i_ino, bix, level, ofs, err); | |
659 | return err; | |
660 | } | |
661 | ||
662 | int logfs_segment_delete(struct inode *inode, struct logfs_shadow *shadow) | |
663 | { | |
664 | struct super_block *sb = inode->i_sb; | |
c6d38301 | 665 | struct logfs_super *super = logfs_super(sb); |
5db53f3e JE |
666 | struct logfs_object_header h; |
667 | u16 len; | |
668 | int err; | |
669 | ||
c6d38301 JE |
670 | super->s_flags |= LOGFS_SB_FLAG_DIRTY; |
671 | BUG_ON(super->s_flags & LOGFS_SB_FLAG_SHUTDOWN); | |
5db53f3e JE |
672 | BUG_ON(shadow->old_ofs & LOGFS_FULLY_POPULATED); |
673 | if (!shadow->old_ofs) | |
674 | return 0; | |
675 | ||
676 | log_segment("logfs_segment_delete(%llx, %llx, %x) %llx->%llx %x->%x\n", | |
677 | shadow->ino, shadow->bix, shadow->gc_level, | |
678 | shadow->old_ofs, shadow->new_ofs, | |
679 | shadow->old_len, shadow->new_len); | |
680 | err = read_obj_header(sb, shadow->old_ofs, &h); | |
681 | LOGFS_BUG_ON(err, sb); | |
682 | LOGFS_BUG_ON(be64_to_cpu(h.ino) != inode->i_ino, sb); | |
683 | LOGFS_BUG_ON(check_pos(sb, shadow->bix, be64_to_cpu(h.bix), | |
684 | shrink_level(shadow->gc_level)), sb); | |
685 | ||
686 | if (shadow->gc_level == 0) | |
687 | len = be16_to_cpu(h.len); | |
688 | else | |
689 | len = obj_len(sb, h.type); | |
690 | shadow->old_len = len + sizeof(h); | |
691 | return 0; | |
692 | } | |
693 | ||
694 | static void freeseg(struct super_block *sb, u32 segno) | |
695 | { | |
696 | struct logfs_super *super = logfs_super(sb); | |
697 | struct address_space *mapping = super->s_mapping_inode->i_mapping; | |
698 | struct page *page; | |
699 | u64 ofs, start, end; | |
700 | ||
701 | start = dev_ofs(sb, segno, 0); | |
702 | end = dev_ofs(sb, segno + 1, 0); | |
703 | for (ofs = start; ofs < end; ofs += PAGE_SIZE) { | |
704 | page = find_get_page(mapping, ofs >> PAGE_SHIFT); | |
705 | if (!page) | |
706 | continue; | |
707 | ClearPagePrivate(page); | |
708 | page_cache_release(page); | |
709 | } | |
710 | } | |
711 | ||
712 | int logfs_open_area(struct logfs_area *area, size_t bytes) | |
713 | { | |
714 | struct super_block *sb = area->a_sb; | |
715 | struct logfs_super *super = logfs_super(sb); | |
716 | int err, closed = 0; | |
717 | ||
718 | if (area->a_is_open && area->a_used_bytes + bytes <= super->s_segsize) | |
719 | return 0; | |
720 | ||
721 | if (area->a_is_open) { | |
722 | u64 ofs = dev_ofs(sb, area->a_segno, area->a_written_bytes); | |
723 | u32 len = super->s_segsize - area->a_written_bytes; | |
724 | ||
725 | log_gc("logfs_close_area(%x)\n", area->a_segno); | |
726 | pad_wbuf(area, 1); | |
727 | super->s_devops->writeseg(area->a_sb, ofs, len); | |
728 | freeseg(sb, area->a_segno); | |
729 | closed = 1; | |
730 | } | |
731 | ||
732 | area->a_used_bytes = 0; | |
733 | area->a_written_bytes = 0; | |
734 | again: | |
735 | area->a_ops->get_free_segment(area); | |
736 | area->a_ops->get_erase_count(area); | |
737 | ||
738 | log_gc("logfs_open_area(%x, %x)\n", area->a_segno, area->a_level); | |
739 | err = area->a_ops->erase_segment(area); | |
740 | if (err) { | |
741 | printk(KERN_WARNING "LogFS: Error erasing segment %x\n", | |
742 | area->a_segno); | |
743 | logfs_mark_segment_bad(sb, area->a_segno); | |
744 | goto again; | |
745 | } | |
746 | area->a_is_open = 1; | |
747 | return closed; | |
748 | } | |
749 | ||
750 | void logfs_sync_area(struct logfs_area *area) | |
751 | { | |
752 | struct super_block *sb = area->a_sb; | |
753 | struct logfs_super *super = logfs_super(sb); | |
754 | u64 ofs = dev_ofs(sb, area->a_segno, area->a_written_bytes); | |
755 | u32 len = (area->a_used_bytes - area->a_written_bytes); | |
756 | ||
757 | if (super->s_writesize) | |
758 | len &= ~(super->s_writesize - 1); | |
759 | if (len == 0) | |
760 | return; | |
761 | pad_wbuf(area, 0); | |
762 | super->s_devops->writeseg(sb, ofs, len); | |
763 | area->a_written_bytes += len; | |
764 | } | |
765 | ||
766 | void logfs_sync_segments(struct super_block *sb) | |
767 | { | |
768 | struct logfs_super *super = logfs_super(sb); | |
769 | int i; | |
770 | ||
771 | for_each_area(i) | |
772 | logfs_sync_area(super->s_area[i]); | |
773 | } | |
774 | ||
775 | /* | |
776 | * Pick a free segment to be used for this area. Effectively takes a | |
777 | * candidate from the free list (not really a candidate anymore). | |
778 | */ | |
779 | static void ostore_get_free_segment(struct logfs_area *area) | |
780 | { | |
781 | struct super_block *sb = area->a_sb; | |
782 | struct logfs_super *super = logfs_super(sb); | |
783 | ||
784 | if (super->s_free_list.count == 0) { | |
785 | printk(KERN_ERR"LOGFS: ran out of free segments\n"); | |
786 | LOGFS_BUG(sb); | |
787 | } | |
788 | ||
789 | area->a_segno = get_best_cand(sb, &super->s_free_list, NULL); | |
790 | } | |
791 | ||
792 | static void ostore_get_erase_count(struct logfs_area *area) | |
793 | { | |
794 | struct logfs_segment_entry se; | |
795 | u32 ec_level; | |
796 | ||
797 | logfs_get_segment_entry(area->a_sb, area->a_segno, &se); | |
798 | BUG_ON(se.ec_level == cpu_to_be32(BADSEG) || | |
799 | se.valid == cpu_to_be32(RESERVED)); | |
800 | ||
801 | ec_level = be32_to_cpu(se.ec_level); | |
802 | area->a_erase_count = (ec_level >> 4) + 1; | |
803 | } | |
804 | ||
805 | static int ostore_erase_segment(struct logfs_area *area) | |
806 | { | |
807 | struct super_block *sb = area->a_sb; | |
808 | struct logfs_segment_header sh; | |
809 | u64 ofs; | |
810 | int err; | |
811 | ||
9421502b | 812 | err = logfs_erase_segment(sb, area->a_segno, 0); |
5db53f3e JE |
813 | if (err) |
814 | return err; | |
815 | ||
816 | sh.pad = 0; | |
817 | sh.type = SEG_OSTORE; | |
818 | sh.level = (__force u8)area->a_level; | |
819 | sh.segno = cpu_to_be32(area->a_segno); | |
820 | sh.ec = cpu_to_be32(area->a_erase_count); | |
821 | sh.gec = cpu_to_be64(logfs_super(sb)->s_gec); | |
822 | sh.crc = logfs_crc32(&sh, sizeof(sh), 4); | |
823 | ||
824 | logfs_set_segment_erased(sb, area->a_segno, area->a_erase_count, | |
825 | area->a_level); | |
826 | ||
827 | ofs = dev_ofs(sb, area->a_segno, 0); | |
828 | area->a_used_bytes = sizeof(sh); | |
829 | logfs_buf_write(area, ofs, &sh, sizeof(sh)); | |
830 | return 0; | |
831 | } | |
832 | ||
833 | static const struct logfs_area_ops ostore_area_ops = { | |
834 | .get_free_segment = ostore_get_free_segment, | |
835 | .get_erase_count = ostore_get_erase_count, | |
836 | .erase_segment = ostore_erase_segment, | |
837 | }; | |
838 | ||
839 | static void free_area(struct logfs_area *area) | |
840 | { | |
841 | if (area) | |
842 | freeseg(area->a_sb, area->a_segno); | |
843 | kfree(area); | |
844 | } | |
845 | ||
846 | static struct logfs_area *alloc_area(struct super_block *sb) | |
847 | { | |
848 | struct logfs_area *area; | |
849 | ||
850 | area = kzalloc(sizeof(*area), GFP_KERNEL); | |
851 | if (!area) | |
852 | return NULL; | |
853 | ||
854 | area->a_sb = sb; | |
855 | return area; | |
856 | } | |
857 | ||
858 | static void map_invalidatepage(struct page *page, unsigned long l) | |
859 | { | |
860 | BUG(); | |
861 | } | |
862 | ||
863 | static int map_releasepage(struct page *page, gfp_t g) | |
864 | { | |
865 | /* Don't release these pages */ | |
866 | return 0; | |
867 | } | |
868 | ||
869 | static const struct address_space_operations mapping_aops = { | |
870 | .invalidatepage = map_invalidatepage, | |
871 | .releasepage = map_releasepage, | |
872 | .set_page_dirty = __set_page_dirty_nobuffers, | |
873 | }; | |
874 | ||
875 | int logfs_init_mapping(struct super_block *sb) | |
876 | { | |
877 | struct logfs_super *super = logfs_super(sb); | |
878 | struct address_space *mapping; | |
879 | struct inode *inode; | |
880 | ||
881 | inode = logfs_new_meta_inode(sb, LOGFS_INO_MAPPING); | |
882 | if (IS_ERR(inode)) | |
883 | return PTR_ERR(inode); | |
884 | super->s_mapping_inode = inode; | |
885 | mapping = inode->i_mapping; | |
886 | mapping->a_ops = &mapping_aops; | |
887 | /* Would it be possible to use __GFP_HIGHMEM as well? */ | |
888 | mapping_set_gfp_mask(mapping, GFP_NOFS); | |
889 | return 0; | |
890 | } | |
891 | ||
892 | int logfs_init_areas(struct super_block *sb) | |
893 | { | |
894 | struct logfs_super *super = logfs_super(sb); | |
895 | int i = -1; | |
896 | ||
897 | super->s_alias_pool = mempool_create_kmalloc_pool(600, | |
898 | sizeof(struct object_alias_item)); | |
899 | if (!super->s_alias_pool) | |
900 | return -ENOMEM; | |
901 | ||
902 | super->s_journal_area = alloc_area(sb); | |
903 | if (!super->s_journal_area) | |
904 | goto err; | |
905 | ||
906 | for_each_area(i) { | |
907 | super->s_area[i] = alloc_area(sb); | |
908 | if (!super->s_area[i]) | |
909 | goto err; | |
910 | super->s_area[i]->a_level = GC_LEVEL(i); | |
911 | super->s_area[i]->a_ops = &ostore_area_ops; | |
912 | } | |
913 | btree_init_mempool128(&super->s_object_alias_tree, | |
914 | super->s_btree_pool); | |
915 | return 0; | |
916 | ||
917 | err: | |
918 | for (i--; i >= 0; i--) | |
919 | free_area(super->s_area[i]); | |
920 | free_area(super->s_journal_area); | |
921 | mempool_destroy(super->s_alias_pool); | |
922 | return -ENOMEM; | |
923 | } | |
924 | ||
925 | void logfs_cleanup_areas(struct super_block *sb) | |
926 | { | |
927 | struct logfs_super *super = logfs_super(sb); | |
928 | int i; | |
929 | ||
930 | btree_grim_visitor128(&super->s_object_alias_tree, 0, kill_alias); | |
931 | for_each_area(i) | |
932 | free_area(super->s_area[i]); | |
933 | free_area(super->s_journal_area); | |
934 | destroy_meta_inode(super->s_mapping_inode); | |
935 | } |