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a28ef1f5 CY |
1 | /* |
2 | * f2fs extent cache support | |
3 | * | |
4 | * Copyright (c) 2015 Motorola Mobility | |
5 | * Copyright (c) 2015 Samsung Electronics | |
6 | * Authors: Jaegeuk Kim <jaegeuk@kernel.org> | |
7 | * Chao Yu <chao2.yu@samsung.com> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
13 | ||
14 | #include <linux/fs.h> | |
15 | #include <linux/f2fs_fs.h> | |
16 | ||
17 | #include "f2fs.h" | |
18 | #include "node.h" | |
19 | #include <trace/events/f2fs.h> | |
20 | ||
21 | static struct kmem_cache *extent_tree_slab; | |
22 | static struct kmem_cache *extent_node_slab; | |
23 | ||
24 | static struct extent_node *__attach_extent_node(struct f2fs_sb_info *sbi, | |
25 | struct extent_tree *et, struct extent_info *ei, | |
26 | struct rb_node *parent, struct rb_node **p) | |
27 | { | |
28 | struct extent_node *en; | |
29 | ||
30 | en = kmem_cache_alloc(extent_node_slab, GFP_ATOMIC); | |
31 | if (!en) | |
32 | return NULL; | |
33 | ||
34 | en->ei = *ei; | |
35 | INIT_LIST_HEAD(&en->list); | |
36 | ||
37 | rb_link_node(&en->rb_node, parent, p); | |
38 | rb_insert_color(&en->rb_node, &et->root); | |
39 | et->count++; | |
40 | atomic_inc(&sbi->total_ext_node); | |
41 | return en; | |
42 | } | |
43 | ||
44 | static void __detach_extent_node(struct f2fs_sb_info *sbi, | |
45 | struct extent_tree *et, struct extent_node *en) | |
46 | { | |
47 | rb_erase(&en->rb_node, &et->root); | |
48 | et->count--; | |
49 | atomic_dec(&sbi->total_ext_node); | |
50 | ||
51 | if (et->cached_en == en) | |
52 | et->cached_en = NULL; | |
53 | } | |
54 | ||
55 | static struct extent_tree *__grab_extent_tree(struct inode *inode) | |
56 | { | |
57 | struct f2fs_sb_info *sbi = F2FS_I_SB(inode); | |
58 | struct extent_tree *et; | |
59 | nid_t ino = inode->i_ino; | |
60 | ||
61 | down_write(&sbi->extent_tree_lock); | |
62 | et = radix_tree_lookup(&sbi->extent_tree_root, ino); | |
63 | if (!et) { | |
64 | et = f2fs_kmem_cache_alloc(extent_tree_slab, GFP_NOFS); | |
65 | f2fs_radix_tree_insert(&sbi->extent_tree_root, ino, et); | |
66 | memset(et, 0, sizeof(struct extent_tree)); | |
67 | et->ino = ino; | |
68 | et->root = RB_ROOT; | |
69 | et->cached_en = NULL; | |
70 | rwlock_init(&et->lock); | |
71 | atomic_set(&et->refcount, 0); | |
72 | et->count = 0; | |
73 | sbi->total_ext_tree++; | |
74 | } | |
75 | atomic_inc(&et->refcount); | |
76 | up_write(&sbi->extent_tree_lock); | |
77 | ||
78 | /* never died until evict_inode */ | |
79 | F2FS_I(inode)->extent_tree = et; | |
80 | ||
81 | return et; | |
82 | } | |
83 | ||
91c481ff CY |
84 | static struct extent_node *__lookup_extent_tree(struct f2fs_sb_info *sbi, |
85 | struct extent_tree *et, unsigned int fofs) | |
a28ef1f5 CY |
86 | { |
87 | struct rb_node *node = et->root.rb_node; | |
f8b703da | 88 | struct extent_node *en = et->cached_en; |
a28ef1f5 | 89 | |
f8b703da FL |
90 | if (en) { |
91 | struct extent_info *cei = &en->ei; | |
a28ef1f5 | 92 | |
91c481ff CY |
93 | if (cei->fofs <= fofs && cei->fofs + cei->len > fofs) { |
94 | stat_inc_cached_node_hit(sbi); | |
f8b703da | 95 | return en; |
91c481ff | 96 | } |
a28ef1f5 CY |
97 | } |
98 | ||
99 | while (node) { | |
100 | en = rb_entry(node, struct extent_node, rb_node); | |
101 | ||
029e13cc | 102 | if (fofs < en->ei.fofs) { |
a28ef1f5 | 103 | node = node->rb_left; |
029e13cc | 104 | } else if (fofs >= en->ei.fofs + en->ei.len) { |
a28ef1f5 | 105 | node = node->rb_right; |
029e13cc CY |
106 | } else { |
107 | stat_inc_rbtree_node_hit(sbi); | |
a28ef1f5 | 108 | return en; |
029e13cc | 109 | } |
a28ef1f5 CY |
110 | } |
111 | return NULL; | |
112 | } | |
113 | ||
a6f78345 CY |
114 | static struct extent_node *__init_extent_tree(struct f2fs_sb_info *sbi, |
115 | struct extent_tree *et, struct extent_info *ei) | |
a28ef1f5 CY |
116 | { |
117 | struct rb_node **p = &et->root.rb_node; | |
a28ef1f5 CY |
118 | struct extent_node *en; |
119 | ||
a6f78345 | 120 | en = __attach_extent_node(sbi, et, ei, NULL, p); |
a28ef1f5 CY |
121 | if (!en) |
122 | return NULL; | |
a6f78345 CY |
123 | |
124 | et->largest = en->ei; | |
a28ef1f5 CY |
125 | et->cached_en = en; |
126 | return en; | |
127 | } | |
128 | ||
129 | static unsigned int __free_extent_tree(struct f2fs_sb_info *sbi, | |
130 | struct extent_tree *et, bool free_all) | |
131 | { | |
132 | struct rb_node *node, *next; | |
133 | struct extent_node *en; | |
134 | unsigned int count = et->count; | |
135 | ||
136 | node = rb_first(&et->root); | |
137 | while (node) { | |
138 | next = rb_next(node); | |
139 | en = rb_entry(node, struct extent_node, rb_node); | |
140 | ||
141 | if (free_all) { | |
142 | spin_lock(&sbi->extent_lock); | |
143 | if (!list_empty(&en->list)) | |
144 | list_del_init(&en->list); | |
145 | spin_unlock(&sbi->extent_lock); | |
146 | } | |
147 | ||
148 | if (free_all || list_empty(&en->list)) { | |
149 | __detach_extent_node(sbi, et, en); | |
150 | kmem_cache_free(extent_node_slab, en); | |
151 | } | |
152 | node = next; | |
153 | } | |
154 | ||
155 | return count - et->count; | |
156 | } | |
157 | ||
54d71856 | 158 | static void __drop_largest_extent(struct inode *inode, pgoff_t fofs) |
a28ef1f5 CY |
159 | { |
160 | struct extent_info *largest = &F2FS_I(inode)->extent_tree->largest; | |
161 | ||
162 | if (largest->fofs <= fofs && largest->fofs + largest->len > fofs) | |
163 | largest->len = 0; | |
164 | } | |
165 | ||
54d71856 CY |
166 | void f2fs_drop_largest_extent(struct inode *inode, pgoff_t fofs) |
167 | { | |
168 | if (!f2fs_may_extent_tree(inode)) | |
169 | return; | |
170 | ||
171 | __drop_largest_extent(inode, fofs); | |
172 | } | |
173 | ||
a28ef1f5 CY |
174 | void f2fs_init_extent_tree(struct inode *inode, struct f2fs_extent *i_ext) |
175 | { | |
176 | struct f2fs_sb_info *sbi = F2FS_I_SB(inode); | |
177 | struct extent_tree *et; | |
178 | struct extent_node *en; | |
179 | struct extent_info ei; | |
180 | ||
181 | if (!f2fs_may_extent_tree(inode)) | |
182 | return; | |
183 | ||
184 | et = __grab_extent_tree(inode); | |
185 | ||
186 | if (!i_ext || le32_to_cpu(i_ext->len) < F2FS_MIN_EXTENT_LEN) | |
187 | return; | |
188 | ||
189 | set_extent_info(&ei, le32_to_cpu(i_ext->fofs), | |
190 | le32_to_cpu(i_ext->blk), le32_to_cpu(i_ext->len)); | |
191 | ||
192 | write_lock(&et->lock); | |
193 | if (et->count) | |
194 | goto out; | |
195 | ||
a6f78345 | 196 | en = __init_extent_tree(sbi, et, &ei); |
a28ef1f5 CY |
197 | if (en) { |
198 | spin_lock(&sbi->extent_lock); | |
199 | list_add_tail(&en->list, &sbi->extent_list); | |
200 | spin_unlock(&sbi->extent_lock); | |
201 | } | |
202 | out: | |
203 | write_unlock(&et->lock); | |
204 | } | |
205 | ||
206 | static bool f2fs_lookup_extent_tree(struct inode *inode, pgoff_t pgofs, | |
207 | struct extent_info *ei) | |
208 | { | |
209 | struct f2fs_sb_info *sbi = F2FS_I_SB(inode); | |
210 | struct extent_tree *et = F2FS_I(inode)->extent_tree; | |
211 | struct extent_node *en; | |
212 | bool ret = false; | |
213 | ||
214 | f2fs_bug_on(sbi, !et); | |
215 | ||
216 | trace_f2fs_lookup_extent_tree_start(inode, pgofs); | |
217 | ||
218 | read_lock(&et->lock); | |
219 | ||
220 | if (et->largest.fofs <= pgofs && | |
221 | et->largest.fofs + et->largest.len > pgofs) { | |
222 | *ei = et->largest; | |
223 | ret = true; | |
91c481ff | 224 | stat_inc_largest_node_hit(sbi); |
a28ef1f5 CY |
225 | goto out; |
226 | } | |
227 | ||
91c481ff | 228 | en = __lookup_extent_tree(sbi, et, pgofs); |
a28ef1f5 CY |
229 | if (en) { |
230 | *ei = en->ei; | |
231 | spin_lock(&sbi->extent_lock); | |
232 | if (!list_empty(&en->list)) | |
233 | list_move_tail(&en->list, &sbi->extent_list); | |
234 | et->cached_en = en; | |
235 | spin_unlock(&sbi->extent_lock); | |
236 | ret = true; | |
a28ef1f5 CY |
237 | } |
238 | out: | |
727edac5 | 239 | stat_inc_total_hit(sbi); |
a28ef1f5 CY |
240 | read_unlock(&et->lock); |
241 | ||
242 | trace_f2fs_lookup_extent_tree_end(inode, pgofs, ei); | |
243 | return ret; | |
244 | } | |
245 | ||
0f825ee6 FL |
246 | |
247 | /* | |
248 | * lookup extent at @fofs, if hit, return the extent | |
249 | * if not, return NULL and | |
250 | * @prev_ex: extent before fofs | |
251 | * @next_ex: extent after fofs | |
252 | * @insert_p: insert point for new extent at fofs | |
253 | * in order to simpfy the insertion after. | |
254 | * tree must stay unchanged between lookup and insertion. | |
255 | */ | |
256 | static struct extent_node *__lookup_extent_tree_ret(struct extent_tree *et, | |
91c481ff CY |
257 | unsigned int fofs, |
258 | struct extent_node **prev_ex, | |
0f825ee6 FL |
259 | struct extent_node **next_ex, |
260 | struct rb_node ***insert_p, | |
261 | struct rb_node **insert_parent) | |
262 | { | |
263 | struct rb_node **pnode = &et->root.rb_node; | |
264 | struct rb_node *parent = NULL, *tmp_node; | |
dac2ddef | 265 | struct extent_node *en = et->cached_en; |
0f825ee6 | 266 | |
dac2ddef CY |
267 | *insert_p = NULL; |
268 | *insert_parent = NULL; | |
269 | *prev_ex = NULL; | |
270 | *next_ex = NULL; | |
271 | ||
272 | if (RB_EMPTY_ROOT(&et->root)) | |
273 | return NULL; | |
274 | ||
275 | if (en) { | |
276 | struct extent_info *cei = &en->ei; | |
0f825ee6 FL |
277 | |
278 | if (cei->fofs <= fofs && cei->fofs + cei->len > fofs) | |
dac2ddef | 279 | goto lookup_neighbors; |
0f825ee6 FL |
280 | } |
281 | ||
282 | while (*pnode) { | |
283 | parent = *pnode; | |
284 | en = rb_entry(*pnode, struct extent_node, rb_node); | |
285 | ||
286 | if (fofs < en->ei.fofs) | |
287 | pnode = &(*pnode)->rb_left; | |
288 | else if (fofs >= en->ei.fofs + en->ei.len) | |
289 | pnode = &(*pnode)->rb_right; | |
290 | else | |
dac2ddef | 291 | goto lookup_neighbors; |
0f825ee6 FL |
292 | } |
293 | ||
294 | *insert_p = pnode; | |
295 | *insert_parent = parent; | |
296 | ||
297 | en = rb_entry(parent, struct extent_node, rb_node); | |
298 | tmp_node = parent; | |
299 | if (parent && fofs > en->ei.fofs) | |
300 | tmp_node = rb_next(parent); | |
301 | *next_ex = tmp_node ? | |
302 | rb_entry(tmp_node, struct extent_node, rb_node) : NULL; | |
303 | ||
304 | tmp_node = parent; | |
305 | if (parent && fofs < en->ei.fofs) | |
306 | tmp_node = rb_prev(parent); | |
307 | *prev_ex = tmp_node ? | |
308 | rb_entry(tmp_node, struct extent_node, rb_node) : NULL; | |
0f825ee6 | 309 | return NULL; |
dac2ddef CY |
310 | |
311 | lookup_neighbors: | |
312 | if (fofs == en->ei.fofs) { | |
313 | /* lookup prev node for merging backward later */ | |
314 | tmp_node = rb_prev(&en->rb_node); | |
315 | *prev_ex = tmp_node ? | |
316 | rb_entry(tmp_node, struct extent_node, rb_node) : NULL; | |
317 | } | |
318 | if (fofs == en->ei.fofs + en->ei.len - 1) { | |
319 | /* lookup next node for merging frontward later */ | |
320 | tmp_node = rb_next(&en->rb_node); | |
321 | *next_ex = tmp_node ? | |
322 | rb_entry(tmp_node, struct extent_node, rb_node) : NULL; | |
323 | } | |
324 | return en; | |
0f825ee6 FL |
325 | } |
326 | ||
ef05e221 | 327 | static struct extent_node *__try_merge_extent_node(struct f2fs_sb_info *sbi, |
0f825ee6 FL |
328 | struct extent_tree *et, struct extent_info *ei, |
329 | struct extent_node **den, | |
330 | struct extent_node *prev_ex, | |
ef05e221 | 331 | struct extent_node *next_ex) |
0f825ee6 | 332 | { |
0f825ee6 | 333 | struct extent_node *en = NULL; |
0f825ee6 FL |
334 | |
335 | if (prev_ex && __is_back_mergeable(ei, &prev_ex->ei)) { | |
0f825ee6 FL |
336 | prev_ex->ei.len += ei->len; |
337 | ei = &prev_ex->ei; | |
338 | en = prev_ex; | |
339 | } | |
ef05e221 | 340 | |
0f825ee6 | 341 | if (next_ex && __is_front_mergeable(ei, &next_ex->ei)) { |
ef05e221 | 342 | if (en) { |
0f825ee6 FL |
343 | __detach_extent_node(sbi, et, prev_ex); |
344 | *den = prev_ex; | |
345 | } | |
346 | next_ex->ei.fofs = ei->fofs; | |
347 | next_ex->ei.blk = ei->blk; | |
348 | next_ex->ei.len += ei->len; | |
349 | en = next_ex; | |
350 | } | |
ef05e221 CY |
351 | |
352 | if (en) { | |
353 | if (en->ei.len > et->largest.len) | |
354 | et->largest = en->ei; | |
355 | et->cached_en = en; | |
356 | } | |
357 | return en; | |
358 | } | |
359 | ||
360 | static struct extent_node *__insert_extent_tree(struct f2fs_sb_info *sbi, | |
361 | struct extent_tree *et, struct extent_info *ei, | |
362 | struct rb_node **insert_p, | |
363 | struct rb_node *insert_parent) | |
364 | { | |
365 | struct rb_node **p = &et->root.rb_node; | |
366 | struct rb_node *parent = NULL; | |
367 | struct extent_node *en = NULL; | |
0f825ee6 FL |
368 | |
369 | if (insert_p && insert_parent) { | |
370 | parent = insert_parent; | |
371 | p = insert_p; | |
372 | goto do_insert; | |
373 | } | |
374 | ||
375 | while (*p) { | |
376 | parent = *p; | |
377 | en = rb_entry(parent, struct extent_node, rb_node); | |
378 | ||
379 | if (ei->fofs < en->ei.fofs) | |
380 | p = &(*p)->rb_left; | |
381 | else if (ei->fofs >= en->ei.fofs + en->ei.len) | |
382 | p = &(*p)->rb_right; | |
383 | else | |
384 | f2fs_bug_on(sbi, 1); | |
385 | } | |
386 | do_insert: | |
387 | en = __attach_extent_node(sbi, et, ei, parent, p); | |
388 | if (!en) | |
389 | return NULL; | |
ef05e221 | 390 | |
0f825ee6 FL |
391 | if (en->ei.len > et->largest.len) |
392 | et->largest = en->ei; | |
393 | et->cached_en = en; | |
394 | return en; | |
395 | } | |
396 | ||
19b2c30d CY |
397 | unsigned int f2fs_update_extent_tree_range(struct inode *inode, |
398 | pgoff_t fofs, block_t blkaddr, unsigned int len) | |
a28ef1f5 CY |
399 | { |
400 | struct f2fs_sb_info *sbi = F2FS_I_SB(inode); | |
401 | struct extent_tree *et = F2FS_I(inode)->extent_tree; | |
402 | struct extent_node *en = NULL, *en1 = NULL, *en2 = NULL, *en3 = NULL; | |
19b2c30d | 403 | struct extent_node *prev_en = NULL, *next_en = NULL; |
a28ef1f5 | 404 | struct extent_info ei, dei, prev; |
0f825ee6 | 405 | struct rb_node **insert_p = NULL, *insert_parent = NULL; |
19b2c30d CY |
406 | unsigned int end = fofs + len; |
407 | unsigned int pos = (unsigned int)fofs; | |
a28ef1f5 CY |
408 | |
409 | if (!et) | |
410 | return false; | |
411 | ||
a28ef1f5 CY |
412 | write_lock(&et->lock); |
413 | ||
414 | if (is_inode_flag_set(F2FS_I(inode), FI_NO_EXTENT)) { | |
415 | write_unlock(&et->lock); | |
416 | return false; | |
417 | } | |
418 | ||
419 | prev = et->largest; | |
420 | dei.len = 0; | |
421 | ||
422 | /* we do not guarantee that the largest extent is cached all the time */ | |
54d71856 | 423 | __drop_largest_extent(inode, fofs); |
a28ef1f5 | 424 | |
19b2c30d CY |
425 | /* 1. lookup first extent node in range [fofs, fofs + len - 1] */ |
426 | en = __lookup_extent_tree_ret(et, fofs, &prev_en, &next_en, | |
0f825ee6 | 427 | &insert_p, &insert_parent); |
19b2c30d CY |
428 | if (!en) { |
429 | if (next_en) { | |
430 | en = next_en; | |
431 | f2fs_bug_on(sbi, en->ei.fofs <= pos); | |
432 | pos = en->ei.fofs; | |
433 | } else { | |
434 | /* | |
435 | * skip searching in the tree since there is no | |
436 | * larger extent node in the cache. | |
437 | */ | |
438 | goto update_extent; | |
439 | } | |
440 | } | |
441 | ||
442 | /* 2. invlidate all extent nodes in range [fofs, fofs + len - 1] */ | |
443 | while (en) { | |
444 | struct rb_node *node; | |
445 | ||
446 | if (pos >= end) | |
447 | break; | |
448 | ||
449 | dei = en->ei; | |
450 | en1 = en2 = NULL; | |
451 | ||
452 | node = rb_next(&en->rb_node); | |
453 | ||
454 | /* | |
455 | * 2.1 there are four cases when we invalidate blkaddr in extent | |
456 | * node, |V: valid address, X: will be invalidated| | |
457 | */ | |
458 | /* case#1, invalidate right part of extent node |VVVVVXXXXX| */ | |
459 | if (pos > dei.fofs && end >= dei.fofs + dei.len) { | |
460 | en->ei.len = pos - dei.fofs; | |
461 | ||
462 | if (en->ei.len < F2FS_MIN_EXTENT_LEN) { | |
463 | __detach_extent_node(sbi, et, en); | |
464 | insert_p = NULL; | |
465 | insert_parent = NULL; | |
466 | goto update; | |
467 | } | |
468 | ||
469 | if (__is_extent_same(&dei, &et->largest)) | |
470 | et->largest = en->ei; | |
471 | goto next; | |
472 | } | |
473 | ||
474 | /* case#2, invalidate left part of extent node |XXXXXVVVVV| */ | |
475 | if (pos <= dei.fofs && end < dei.fofs + dei.len) { | |
476 | en->ei.fofs = end; | |
477 | en->ei.blk += end - dei.fofs; | |
478 | en->ei.len -= end - dei.fofs; | |
479 | ||
480 | if (en->ei.len < F2FS_MIN_EXTENT_LEN) { | |
481 | __detach_extent_node(sbi, et, en); | |
482 | insert_p = NULL; | |
483 | insert_parent = NULL; | |
484 | goto update; | |
485 | } | |
486 | ||
487 | if (__is_extent_same(&dei, &et->largest)) | |
488 | et->largest = en->ei; | |
489 | goto next; | |
a28ef1f5 CY |
490 | } |
491 | ||
19b2c30d CY |
492 | __detach_extent_node(sbi, et, en); |
493 | ||
494 | /* | |
495 | * if we remove node in rb-tree, our parent node pointer may | |
496 | * point the wrong place, discard them. | |
497 | */ | |
498 | insert_p = NULL; | |
499 | insert_parent = NULL; | |
500 | ||
501 | /* case#3, invalidate entire extent node |XXXXXXXXXX| */ | |
502 | if (pos <= dei.fofs && end >= dei.fofs + dei.len) { | |
503 | if (__is_extent_same(&dei, &et->largest)) | |
504 | et->largest.len = 0; | |
505 | goto update; | |
506 | } | |
507 | ||
508 | /* | |
509 | * case#4, invalidate data in the middle of extent node | |
510 | * |VVVXXXXVVV| | |
511 | */ | |
512 | if (dei.len > F2FS_MIN_EXTENT_LEN) { | |
513 | unsigned int endofs; | |
514 | ||
515 | /* insert left part of split extent into cache */ | |
516 | if (pos - dei.fofs >= F2FS_MIN_EXTENT_LEN) { | |
517 | set_extent_info(&ei, dei.fofs, dei.blk, | |
518 | pos - dei.fofs); | |
519 | en1 = __insert_extent_tree(sbi, et, &ei, | |
520 | NULL, NULL); | |
521 | } | |
522 | ||
523 | /* insert right part of split extent into cache */ | |
524 | endofs = dei.fofs + dei.len; | |
525 | if (endofs - end >= F2FS_MIN_EXTENT_LEN) { | |
526 | set_extent_info(&ei, end, | |
527 | end - dei.fofs + dei.blk, | |
528 | endofs - end); | |
529 | en2 = __insert_extent_tree(sbi, et, &ei, | |
530 | NULL, NULL); | |
531 | } | |
a28ef1f5 | 532 | } |
19b2c30d CY |
533 | update: |
534 | /* 2.2 update in global extent list */ | |
535 | spin_lock(&sbi->extent_lock); | |
536 | if (en && !list_empty(&en->list)) | |
537 | list_del(&en->list); | |
538 | if (en1) | |
539 | list_add_tail(&en1->list, &sbi->extent_list); | |
540 | if (en2) | |
541 | list_add_tail(&en2->list, &sbi->extent_list); | |
542 | spin_unlock(&sbi->extent_lock); | |
543 | ||
544 | /* 2.3 release extent node */ | |
545 | if (en) | |
546 | kmem_cache_free(extent_node_slab, en); | |
547 | next: | |
548 | en = node ? rb_entry(node, struct extent_node, rb_node) : NULL; | |
549 | next_en = en; | |
550 | if (en) | |
551 | pos = en->ei.fofs; | |
a28ef1f5 CY |
552 | } |
553 | ||
554 | update_extent: | |
555 | /* 3. update extent in extent cache */ | |
556 | if (blkaddr) { | |
19b2c30d CY |
557 | struct extent_node *den = NULL; |
558 | ||
559 | set_extent_info(&ei, fofs, blkaddr, len); | |
ef05e221 | 560 | en3 = __try_merge_extent_node(sbi, et, &ei, &den, |
19b2c30d | 561 | prev_en, next_en); |
ef05e221 CY |
562 | if (!en3) |
563 | en3 = __insert_extent_tree(sbi, et, &ei, | |
564 | insert_p, insert_parent); | |
a28ef1f5 CY |
565 | |
566 | /* give up extent_cache, if split and small updates happen */ | |
567 | if (dei.len >= 1 && | |
568 | prev.len < F2FS_MIN_EXTENT_LEN && | |
569 | et->largest.len < F2FS_MIN_EXTENT_LEN) { | |
570 | et->largest.len = 0; | |
571 | set_inode_flag(F2FS_I(inode), FI_NO_EXTENT); | |
572 | } | |
a28ef1f5 | 573 | |
19b2c30d CY |
574 | spin_lock(&sbi->extent_lock); |
575 | if (en3) { | |
576 | if (list_empty(&en3->list)) | |
577 | list_add_tail(&en3->list, &sbi->extent_list); | |
578 | else | |
579 | list_move_tail(&en3->list, &sbi->extent_list); | |
580 | } | |
581 | if (den && !list_empty(&den->list)) | |
582 | list_del(&den->list); | |
583 | spin_unlock(&sbi->extent_lock); | |
a28ef1f5 | 584 | |
19b2c30d CY |
585 | if (den) |
586 | kmem_cache_free(extent_node_slab, den); | |
587 | } | |
a28ef1f5 CY |
588 | |
589 | if (is_inode_flag_set(F2FS_I(inode), FI_NO_EXTENT)) | |
590 | __free_extent_tree(sbi, et, true); | |
591 | ||
592 | write_unlock(&et->lock); | |
593 | ||
594 | return !__is_extent_same(&prev, &et->largest); | |
595 | } | |
596 | ||
597 | unsigned int f2fs_shrink_extent_tree(struct f2fs_sb_info *sbi, int nr_shrink) | |
598 | { | |
599 | struct extent_tree *treevec[EXT_TREE_VEC_SIZE]; | |
600 | struct extent_node *en, *tmp; | |
601 | unsigned long ino = F2FS_ROOT_INO(sbi); | |
602 | struct radix_tree_root *root = &sbi->extent_tree_root; | |
603 | unsigned int found; | |
604 | unsigned int node_cnt = 0, tree_cnt = 0; | |
605 | int remained; | |
606 | ||
607 | if (!test_opt(sbi, EXTENT_CACHE)) | |
608 | return 0; | |
609 | ||
610 | if (!down_write_trylock(&sbi->extent_tree_lock)) | |
611 | goto out; | |
612 | ||
613 | /* 1. remove unreferenced extent tree */ | |
614 | while ((found = radix_tree_gang_lookup(root, | |
615 | (void **)treevec, ino, EXT_TREE_VEC_SIZE))) { | |
616 | unsigned i; | |
617 | ||
618 | ino = treevec[found - 1]->ino + 1; | |
619 | for (i = 0; i < found; i++) { | |
620 | struct extent_tree *et = treevec[i]; | |
621 | ||
622 | if (!atomic_read(&et->refcount)) { | |
623 | write_lock(&et->lock); | |
624 | node_cnt += __free_extent_tree(sbi, et, true); | |
625 | write_unlock(&et->lock); | |
626 | ||
627 | radix_tree_delete(root, et->ino); | |
628 | kmem_cache_free(extent_tree_slab, et); | |
629 | sbi->total_ext_tree--; | |
630 | tree_cnt++; | |
631 | ||
632 | if (node_cnt + tree_cnt >= nr_shrink) | |
633 | goto unlock_out; | |
634 | } | |
635 | } | |
636 | } | |
637 | up_write(&sbi->extent_tree_lock); | |
638 | ||
639 | /* 2. remove LRU extent entries */ | |
640 | if (!down_write_trylock(&sbi->extent_tree_lock)) | |
641 | goto out; | |
642 | ||
643 | remained = nr_shrink - (node_cnt + tree_cnt); | |
644 | ||
645 | spin_lock(&sbi->extent_lock); | |
646 | list_for_each_entry_safe(en, tmp, &sbi->extent_list, list) { | |
647 | if (!remained--) | |
648 | break; | |
649 | list_del_init(&en->list); | |
650 | } | |
651 | spin_unlock(&sbi->extent_lock); | |
652 | ||
653 | while ((found = radix_tree_gang_lookup(root, | |
654 | (void **)treevec, ino, EXT_TREE_VEC_SIZE))) { | |
655 | unsigned i; | |
656 | ||
657 | ino = treevec[found - 1]->ino + 1; | |
658 | for (i = 0; i < found; i++) { | |
659 | struct extent_tree *et = treevec[i]; | |
660 | ||
661 | write_lock(&et->lock); | |
662 | node_cnt += __free_extent_tree(sbi, et, false); | |
663 | write_unlock(&et->lock); | |
664 | ||
665 | if (node_cnt + tree_cnt >= nr_shrink) | |
666 | break; | |
667 | } | |
668 | } | |
669 | unlock_out: | |
670 | up_write(&sbi->extent_tree_lock); | |
671 | out: | |
672 | trace_f2fs_shrink_extent_tree(sbi, node_cnt, tree_cnt); | |
673 | ||
674 | return node_cnt + tree_cnt; | |
675 | } | |
676 | ||
677 | unsigned int f2fs_destroy_extent_node(struct inode *inode) | |
678 | { | |
679 | struct f2fs_sb_info *sbi = F2FS_I_SB(inode); | |
680 | struct extent_tree *et = F2FS_I(inode)->extent_tree; | |
681 | unsigned int node_cnt = 0; | |
682 | ||
683 | if (!et) | |
684 | return 0; | |
685 | ||
686 | write_lock(&et->lock); | |
687 | node_cnt = __free_extent_tree(sbi, et, true); | |
688 | write_unlock(&et->lock); | |
689 | ||
690 | return node_cnt; | |
691 | } | |
692 | ||
693 | void f2fs_destroy_extent_tree(struct inode *inode) | |
694 | { | |
695 | struct f2fs_sb_info *sbi = F2FS_I_SB(inode); | |
696 | struct extent_tree *et = F2FS_I(inode)->extent_tree; | |
697 | unsigned int node_cnt = 0; | |
698 | ||
699 | if (!et) | |
700 | return; | |
701 | ||
702 | if (inode->i_nlink && !is_bad_inode(inode) && et->count) { | |
703 | atomic_dec(&et->refcount); | |
704 | return; | |
705 | } | |
706 | ||
707 | /* free all extent info belong to this extent tree */ | |
708 | node_cnt = f2fs_destroy_extent_node(inode); | |
709 | ||
710 | /* delete extent tree entry in radix tree */ | |
711 | down_write(&sbi->extent_tree_lock); | |
712 | atomic_dec(&et->refcount); | |
713 | f2fs_bug_on(sbi, atomic_read(&et->refcount) || et->count); | |
714 | radix_tree_delete(&sbi->extent_tree_root, inode->i_ino); | |
715 | kmem_cache_free(extent_tree_slab, et); | |
716 | sbi->total_ext_tree--; | |
717 | up_write(&sbi->extent_tree_lock); | |
718 | ||
719 | F2FS_I(inode)->extent_tree = NULL; | |
720 | ||
721 | trace_f2fs_destroy_extent_tree(inode, node_cnt); | |
722 | } | |
723 | ||
724 | bool f2fs_lookup_extent_cache(struct inode *inode, pgoff_t pgofs, | |
725 | struct extent_info *ei) | |
726 | { | |
727 | if (!f2fs_may_extent_tree(inode)) | |
728 | return false; | |
729 | ||
730 | return f2fs_lookup_extent_tree(inode, pgofs, ei); | |
731 | } | |
732 | ||
733 | void f2fs_update_extent_cache(struct dnode_of_data *dn) | |
734 | { | |
735 | struct f2fs_inode_info *fi = F2FS_I(dn->inode); | |
736 | pgoff_t fofs; | |
737 | ||
738 | if (!f2fs_may_extent_tree(dn->inode)) | |
739 | return; | |
740 | ||
741 | f2fs_bug_on(F2FS_I_SB(dn->inode), dn->data_blkaddr == NEW_ADDR); | |
742 | ||
19b2c30d | 743 | |
a28ef1f5 CY |
744 | fofs = start_bidx_of_node(ofs_of_node(dn->node_page), fi) + |
745 | dn->ofs_in_node; | |
746 | ||
19b2c30d CY |
747 | if (f2fs_update_extent_tree_range(dn->inode, fofs, dn->data_blkaddr, 1)) |
748 | sync_inode_page(dn); | |
749 | } | |
750 | ||
751 | void f2fs_update_extent_cache_range(struct dnode_of_data *dn, | |
752 | pgoff_t fofs, block_t blkaddr, unsigned int len) | |
753 | ||
754 | { | |
755 | if (!f2fs_may_extent_tree(dn->inode)) | |
756 | return; | |
757 | ||
758 | if (f2fs_update_extent_tree_range(dn->inode, fofs, blkaddr, len)) | |
a28ef1f5 CY |
759 | sync_inode_page(dn); |
760 | } | |
761 | ||
762 | void init_extent_cache_info(struct f2fs_sb_info *sbi) | |
763 | { | |
764 | INIT_RADIX_TREE(&sbi->extent_tree_root, GFP_NOIO); | |
765 | init_rwsem(&sbi->extent_tree_lock); | |
766 | INIT_LIST_HEAD(&sbi->extent_list); | |
767 | spin_lock_init(&sbi->extent_lock); | |
768 | sbi->total_ext_tree = 0; | |
769 | atomic_set(&sbi->total_ext_node, 0); | |
770 | } | |
771 | ||
772 | int __init create_extent_cache(void) | |
773 | { | |
774 | extent_tree_slab = f2fs_kmem_cache_create("f2fs_extent_tree", | |
775 | sizeof(struct extent_tree)); | |
776 | if (!extent_tree_slab) | |
777 | return -ENOMEM; | |
778 | extent_node_slab = f2fs_kmem_cache_create("f2fs_extent_node", | |
779 | sizeof(struct extent_node)); | |
780 | if (!extent_node_slab) { | |
781 | kmem_cache_destroy(extent_tree_slab); | |
782 | return -ENOMEM; | |
783 | } | |
784 | return 0; | |
785 | } | |
786 | ||
787 | void destroy_extent_cache(void) | |
788 | { | |
789 | kmem_cache_destroy(extent_node_slab); | |
790 | kmem_cache_destroy(extent_tree_slab); | |
791 | } |