Commit | Line | Data |
---|---|---|
0a8165d7 | 1 | /* |
7bc09003 JK |
2 | * fs/f2fs/gc.c |
3 | * | |
4 | * Copyright (c) 2012 Samsung Electronics Co., Ltd. | |
5 | * http://www.samsung.com/ | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | #include <linux/fs.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/backing-dev.h> | |
7bc09003 JK |
14 | #include <linux/init.h> |
15 | #include <linux/f2fs_fs.h> | |
16 | #include <linux/kthread.h> | |
17 | #include <linux/delay.h> | |
18 | #include <linux/freezer.h> | |
7bc09003 JK |
19 | |
20 | #include "f2fs.h" | |
21 | #include "node.h" | |
22 | #include "segment.h" | |
23 | #include "gc.h" | |
8e46b3ed | 24 | #include <trace/events/f2fs.h> |
7bc09003 | 25 | |
7bc09003 JK |
26 | static int gc_thread_func(void *data) |
27 | { | |
28 | struct f2fs_sb_info *sbi = data; | |
b59d0bae | 29 | struct f2fs_gc_kthread *gc_th = sbi->gc_thread; |
7bc09003 JK |
30 | wait_queue_head_t *wq = &sbi->gc_thread->gc_wait_queue_head; |
31 | long wait_ms; | |
32 | ||
b59d0bae | 33 | wait_ms = gc_th->min_sleep_time; |
7bc09003 JK |
34 | |
35 | do { | |
36 | if (try_to_freeze()) | |
37 | continue; | |
38 | else | |
39 | wait_event_interruptible_timeout(*wq, | |
40 | kthread_should_stop(), | |
41 | msecs_to_jiffies(wait_ms)); | |
42 | if (kthread_should_stop()) | |
43 | break; | |
44 | ||
d6212a5f | 45 | if (sbi->sb->s_writers.frozen >= SB_FREEZE_WRITE) { |
88dd8934 | 46 | increase_sleep_time(gc_th, &wait_ms); |
d6212a5f CL |
47 | continue; |
48 | } | |
49 | ||
0f348028 CY |
50 | #ifdef CONFIG_F2FS_FAULT_INJECTION |
51 | if (time_to_inject(sbi, FAULT_CHECKPOINT)) | |
52 | f2fs_stop_checkpoint(sbi, false); | |
53 | #endif | |
54 | ||
7bc09003 JK |
55 | /* |
56 | * [GC triggering condition] | |
57 | * 0. GC is not conducted currently. | |
58 | * 1. There are enough dirty segments. | |
59 | * 2. IO subsystem is idle by checking the # of writeback pages. | |
60 | * 3. IO subsystem is idle by checking the # of requests in | |
61 | * bdev's request list. | |
62 | * | |
e1c42045 | 63 | * Note) We have to avoid triggering GCs frequently. |
7bc09003 JK |
64 | * Because it is possible that some segments can be |
65 | * invalidated soon after by user update or deletion. | |
66 | * So, I'd like to wait some time to collect dirty segments. | |
67 | */ | |
68 | if (!mutex_trylock(&sbi->gc_mutex)) | |
69 | continue; | |
70 | ||
71 | if (!is_idle(sbi)) { | |
88dd8934 | 72 | increase_sleep_time(gc_th, &wait_ms); |
7bc09003 JK |
73 | mutex_unlock(&sbi->gc_mutex); |
74 | continue; | |
75 | } | |
76 | ||
77 | if (has_enough_invalid_blocks(sbi)) | |
88dd8934 | 78 | decrease_sleep_time(gc_th, &wait_ms); |
7bc09003 | 79 | else |
88dd8934 | 80 | increase_sleep_time(gc_th, &wait_ms); |
7bc09003 | 81 | |
dcdfff65 | 82 | stat_inc_bggc_count(sbi); |
7bc09003 | 83 | |
43727527 | 84 | /* if return value is not zero, no victim was selected */ |
7702bdbe | 85 | if (f2fs_gc(sbi, test_opt(sbi, FORCE_FG_GC), true)) |
b59d0bae | 86 | wait_ms = gc_th->no_gc_sleep_time; |
81eb8d6e | 87 | |
84e4214f JK |
88 | trace_f2fs_background_gc(sbi->sb, wait_ms, |
89 | prefree_segments(sbi), free_segments(sbi)); | |
90 | ||
4660f9c0 JK |
91 | /* balancing f2fs's metadata periodically */ |
92 | f2fs_balance_fs_bg(sbi); | |
81eb8d6e | 93 | |
7bc09003 JK |
94 | } while (!kthread_should_stop()); |
95 | return 0; | |
96 | } | |
97 | ||
98 | int start_gc_thread(struct f2fs_sb_info *sbi) | |
99 | { | |
1042d60f | 100 | struct f2fs_gc_kthread *gc_th; |
ec7b1f2d | 101 | dev_t dev = sbi->sb->s_bdev->bd_dev; |
7a267f8d | 102 | int err = 0; |
7bc09003 | 103 | |
1ecc0c5c | 104 | gc_th = f2fs_kmalloc(sbi, sizeof(struct f2fs_gc_kthread), GFP_KERNEL); |
7a267f8d NJ |
105 | if (!gc_th) { |
106 | err = -ENOMEM; | |
107 | goto out; | |
108 | } | |
7bc09003 | 109 | |
b59d0bae NJ |
110 | gc_th->min_sleep_time = DEF_GC_THREAD_MIN_SLEEP_TIME; |
111 | gc_th->max_sleep_time = DEF_GC_THREAD_MAX_SLEEP_TIME; | |
112 | gc_th->no_gc_sleep_time = DEF_GC_THREAD_NOGC_SLEEP_TIME; | |
113 | ||
d2dc095f NJ |
114 | gc_th->gc_idle = 0; |
115 | ||
7bc09003 JK |
116 | sbi->gc_thread = gc_th; |
117 | init_waitqueue_head(&sbi->gc_thread->gc_wait_queue_head); | |
118 | sbi->gc_thread->f2fs_gc_task = kthread_run(gc_thread_func, sbi, | |
ec7b1f2d | 119 | "f2fs_gc-%u:%u", MAJOR(dev), MINOR(dev)); |
7bc09003 | 120 | if (IS_ERR(gc_th->f2fs_gc_task)) { |
7a267f8d | 121 | err = PTR_ERR(gc_th->f2fs_gc_task); |
7bc09003 | 122 | kfree(gc_th); |
25718423 | 123 | sbi->gc_thread = NULL; |
7bc09003 | 124 | } |
7a267f8d NJ |
125 | out: |
126 | return err; | |
7bc09003 JK |
127 | } |
128 | ||
129 | void stop_gc_thread(struct f2fs_sb_info *sbi) | |
130 | { | |
131 | struct f2fs_gc_kthread *gc_th = sbi->gc_thread; | |
132 | if (!gc_th) | |
133 | return; | |
134 | kthread_stop(gc_th->f2fs_gc_task); | |
135 | kfree(gc_th); | |
136 | sbi->gc_thread = NULL; | |
137 | } | |
138 | ||
d2dc095f | 139 | static int select_gc_type(struct f2fs_gc_kthread *gc_th, int gc_type) |
7bc09003 | 140 | { |
d2dc095f NJ |
141 | int gc_mode = (gc_type == BG_GC) ? GC_CB : GC_GREEDY; |
142 | ||
143 | if (gc_th && gc_th->gc_idle) { | |
144 | if (gc_th->gc_idle == 1) | |
145 | gc_mode = GC_CB; | |
146 | else if (gc_th->gc_idle == 2) | |
147 | gc_mode = GC_GREEDY; | |
148 | } | |
149 | return gc_mode; | |
7bc09003 JK |
150 | } |
151 | ||
152 | static void select_policy(struct f2fs_sb_info *sbi, int gc_type, | |
153 | int type, struct victim_sel_policy *p) | |
154 | { | |
155 | struct dirty_seglist_info *dirty_i = DIRTY_I(sbi); | |
156 | ||
4ebefc44 | 157 | if (p->alloc_mode == SSR) { |
7bc09003 JK |
158 | p->gc_mode = GC_GREEDY; |
159 | p->dirty_segmap = dirty_i->dirty_segmap[type]; | |
a26b7c8a | 160 | p->max_search = dirty_i->nr_dirty[type]; |
7bc09003 JK |
161 | p->ofs_unit = 1; |
162 | } else { | |
d2dc095f | 163 | p->gc_mode = select_gc_type(sbi->gc_thread, gc_type); |
7bc09003 | 164 | p->dirty_segmap = dirty_i->dirty_segmap[DIRTY]; |
a26b7c8a | 165 | p->max_search = dirty_i->nr_dirty[DIRTY]; |
7bc09003 JK |
166 | p->ofs_unit = sbi->segs_per_sec; |
167 | } | |
a26b7c8a | 168 | |
e93b9865 HP |
169 | /* we need to check every dirty segments in the FG_GC case */ |
170 | if (gc_type != FG_GC && p->max_search > sbi->max_victim_search) | |
b1c57c1c | 171 | p->max_search = sbi->max_victim_search; |
a26b7c8a | 172 | |
7bc09003 JK |
173 | p->offset = sbi->last_victim[p->gc_mode]; |
174 | } | |
175 | ||
176 | static unsigned int get_max_cost(struct f2fs_sb_info *sbi, | |
177 | struct victim_sel_policy *p) | |
178 | { | |
b7250d2d JK |
179 | /* SSR allocates in a segment unit */ |
180 | if (p->alloc_mode == SSR) | |
3519e3f9 | 181 | return sbi->blocks_per_seg; |
7bc09003 | 182 | if (p->gc_mode == GC_GREEDY) |
3519e3f9 | 183 | return sbi->blocks_per_seg * p->ofs_unit; |
7bc09003 JK |
184 | else if (p->gc_mode == GC_CB) |
185 | return UINT_MAX; | |
186 | else /* No other gc_mode */ | |
187 | return 0; | |
188 | } | |
189 | ||
190 | static unsigned int check_bg_victims(struct f2fs_sb_info *sbi) | |
191 | { | |
192 | struct dirty_seglist_info *dirty_i = DIRTY_I(sbi); | |
5ec4e49f | 193 | unsigned int secno; |
7bc09003 JK |
194 | |
195 | /* | |
196 | * If the gc_type is FG_GC, we can select victim segments | |
197 | * selected by background GC before. | |
198 | * Those segments guarantee they have small valid blocks. | |
199 | */ | |
7cd8558b | 200 | for_each_set_bit(secno, dirty_i->victim_secmap, MAIN_SECS(sbi)) { |
5ec4e49f | 201 | if (sec_usage_check(sbi, secno)) |
b65ee148 | 202 | continue; |
e93b9865 HP |
203 | |
204 | if (no_fggc_candidate(sbi, secno)) | |
205 | continue; | |
206 | ||
5ec4e49f JK |
207 | clear_bit(secno, dirty_i->victim_secmap); |
208 | return secno * sbi->segs_per_sec; | |
7bc09003 JK |
209 | } |
210 | return NULL_SEGNO; | |
211 | } | |
212 | ||
213 | static unsigned int get_cb_cost(struct f2fs_sb_info *sbi, unsigned int segno) | |
214 | { | |
215 | struct sit_info *sit_i = SIT_I(sbi); | |
216 | unsigned int secno = GET_SECNO(sbi, segno); | |
217 | unsigned int start = secno * sbi->segs_per_sec; | |
218 | unsigned long long mtime = 0; | |
219 | unsigned int vblocks; | |
220 | unsigned char age = 0; | |
221 | unsigned char u; | |
222 | unsigned int i; | |
223 | ||
224 | for (i = 0; i < sbi->segs_per_sec; i++) | |
225 | mtime += get_seg_entry(sbi, start + i)->mtime; | |
226 | vblocks = get_valid_blocks(sbi, segno, sbi->segs_per_sec); | |
227 | ||
228 | mtime = div_u64(mtime, sbi->segs_per_sec); | |
229 | vblocks = div_u64(vblocks, sbi->segs_per_sec); | |
230 | ||
231 | u = (vblocks * 100) >> sbi->log_blocks_per_seg; | |
232 | ||
e1c42045 | 233 | /* Handle if the system time has changed by the user */ |
7bc09003 JK |
234 | if (mtime < sit_i->min_mtime) |
235 | sit_i->min_mtime = mtime; | |
236 | if (mtime > sit_i->max_mtime) | |
237 | sit_i->max_mtime = mtime; | |
238 | if (sit_i->max_mtime != sit_i->min_mtime) | |
239 | age = 100 - div64_u64(100 * (mtime - sit_i->min_mtime), | |
240 | sit_i->max_mtime - sit_i->min_mtime); | |
241 | ||
242 | return UINT_MAX - ((100 * (100 - u) * age) / (100 + u)); | |
243 | } | |
244 | ||
a57e564d JX |
245 | static inline unsigned int get_gc_cost(struct f2fs_sb_info *sbi, |
246 | unsigned int segno, struct victim_sel_policy *p) | |
7bc09003 JK |
247 | { |
248 | if (p->alloc_mode == SSR) | |
249 | return get_seg_entry(sbi, segno)->ckpt_valid_blocks; | |
250 | ||
251 | /* alloc_mode == LFS */ | |
252 | if (p->gc_mode == GC_GREEDY) | |
253 | return get_valid_blocks(sbi, segno, sbi->segs_per_sec); | |
254 | else | |
255 | return get_cb_cost(sbi, segno); | |
256 | } | |
257 | ||
688159b6 FL |
258 | static unsigned int count_bits(const unsigned long *addr, |
259 | unsigned int offset, unsigned int len) | |
260 | { | |
261 | unsigned int end = offset + len, sum = 0; | |
262 | ||
263 | while (offset < end) { | |
264 | if (test_bit(offset++, addr)) | |
265 | ++sum; | |
266 | } | |
267 | return sum; | |
268 | } | |
269 | ||
0a8165d7 | 270 | /* |
111d2495 | 271 | * This function is called from two paths. |
7bc09003 JK |
272 | * One is garbage collection and the other is SSR segment selection. |
273 | * When it is called during GC, it just gets a victim segment | |
274 | * and it does not remove it from dirty seglist. | |
275 | * When it is called from SSR segment selection, it finds a segment | |
276 | * which has minimum valid blocks and removes it from dirty seglist. | |
277 | */ | |
278 | static int get_victim_by_default(struct f2fs_sb_info *sbi, | |
279 | unsigned int *result, int gc_type, int type, char alloc_mode) | |
280 | { | |
281 | struct dirty_seglist_info *dirty_i = DIRTY_I(sbi); | |
282 | struct victim_sel_policy p; | |
3fa56503 | 283 | unsigned int secno, last_victim; |
a43f7ec3 | 284 | unsigned int last_segment = MAIN_SEGS(sbi); |
688159b6 | 285 | unsigned int nsearched = 0; |
7bc09003 | 286 | |
210f41bc CY |
287 | mutex_lock(&dirty_i->seglist_lock); |
288 | ||
7bc09003 JK |
289 | p.alloc_mode = alloc_mode; |
290 | select_policy(sbi, gc_type, type, &p); | |
291 | ||
292 | p.min_segno = NULL_SEGNO; | |
3fa56503 | 293 | p.min_cost = get_max_cost(sbi, &p); |
7bc09003 | 294 | |
3342bb30 CY |
295 | if (p.max_search == 0) |
296 | goto out; | |
297 | ||
4ce53776 | 298 | last_victim = sbi->last_victim[p.gc_mode]; |
7bc09003 JK |
299 | if (p.alloc_mode == LFS && gc_type == FG_GC) { |
300 | p.min_segno = check_bg_victims(sbi); | |
301 | if (p.min_segno != NULL_SEGNO) | |
302 | goto got_it; | |
303 | } | |
304 | ||
305 | while (1) { | |
306 | unsigned long cost; | |
5ec4e49f | 307 | unsigned int segno; |
7bc09003 | 308 | |
a43f7ec3 CY |
309 | segno = find_next_bit(p.dirty_segmap, last_segment, p.offset); |
310 | if (segno >= last_segment) { | |
7bc09003 | 311 | if (sbi->last_victim[p.gc_mode]) { |
a43f7ec3 | 312 | last_segment = sbi->last_victim[p.gc_mode]; |
7bc09003 JK |
313 | sbi->last_victim[p.gc_mode] = 0; |
314 | p.offset = 0; | |
315 | continue; | |
316 | } | |
317 | break; | |
318 | } | |
a57e564d JX |
319 | |
320 | p.offset = segno + p.ofs_unit; | |
688159b6 | 321 | if (p.ofs_unit > 1) { |
a57e564d | 322 | p.offset -= segno % p.ofs_unit; |
688159b6 FL |
323 | nsearched += count_bits(p.dirty_segmap, |
324 | p.offset - p.ofs_unit, | |
325 | p.ofs_unit); | |
326 | } else { | |
327 | nsearched++; | |
328 | } | |
329 | ||
5ec4e49f | 330 | secno = GET_SECNO(sbi, segno); |
7bc09003 | 331 | |
5ec4e49f | 332 | if (sec_usage_check(sbi, secno)) |
688159b6 | 333 | goto next; |
5ec4e49f | 334 | if (gc_type == BG_GC && test_bit(secno, dirty_i->victim_secmap)) |
688159b6 | 335 | goto next; |
e93b9865 HP |
336 | if (gc_type == FG_GC && p.alloc_mode == LFS && |
337 | no_fggc_candidate(sbi, secno)) | |
338 | goto next; | |
7bc09003 JK |
339 | |
340 | cost = get_gc_cost(sbi, segno, &p); | |
341 | ||
342 | if (p.min_cost > cost) { | |
343 | p.min_segno = segno; | |
344 | p.min_cost = cost; | |
a57e564d | 345 | } |
688159b6 FL |
346 | next: |
347 | if (nsearched >= p.max_search) { | |
4ce53776 JK |
348 | if (!sbi->last_victim[p.gc_mode] && segno <= last_victim) |
349 | sbi->last_victim[p.gc_mode] = last_victim + 1; | |
350 | else | |
351 | sbi->last_victim[p.gc_mode] = segno + 1; | |
7bc09003 JK |
352 | break; |
353 | } | |
354 | } | |
7bc09003 | 355 | if (p.min_segno != NULL_SEGNO) { |
b2b3460a | 356 | got_it: |
7bc09003 | 357 | if (p.alloc_mode == LFS) { |
5ec4e49f JK |
358 | secno = GET_SECNO(sbi, p.min_segno); |
359 | if (gc_type == FG_GC) | |
360 | sbi->cur_victim_sec = secno; | |
361 | else | |
362 | set_bit(secno, dirty_i->victim_secmap); | |
7bc09003 | 363 | } |
5ec4e49f | 364 | *result = (p.min_segno / p.ofs_unit) * p.ofs_unit; |
8e46b3ed NJ |
365 | |
366 | trace_f2fs_get_victim(sbi->sb, type, gc_type, &p, | |
367 | sbi->cur_victim_sec, | |
368 | prefree_segments(sbi), free_segments(sbi)); | |
7bc09003 | 369 | } |
3342bb30 | 370 | out: |
7bc09003 JK |
371 | mutex_unlock(&dirty_i->seglist_lock); |
372 | ||
373 | return (p.min_segno == NULL_SEGNO) ? 0 : 1; | |
374 | } | |
375 | ||
376 | static const struct victim_selection default_v_ops = { | |
377 | .get_victim = get_victim_by_default, | |
378 | }; | |
379 | ||
7dda2af8 | 380 | static struct inode *find_gc_inode(struct gc_inode_list *gc_list, nid_t ino) |
7bc09003 | 381 | { |
7bc09003 JK |
382 | struct inode_entry *ie; |
383 | ||
7dda2af8 CL |
384 | ie = radix_tree_lookup(&gc_list->iroot, ino); |
385 | if (ie) | |
386 | return ie->inode; | |
7bc09003 JK |
387 | return NULL; |
388 | } | |
389 | ||
7dda2af8 | 390 | static void add_gc_inode(struct gc_inode_list *gc_list, struct inode *inode) |
7bc09003 | 391 | { |
6cc4af56 GZ |
392 | struct inode_entry *new_ie; |
393 | ||
7dda2af8 | 394 | if (inode == find_gc_inode(gc_list, inode->i_ino)) { |
6cc4af56 GZ |
395 | iput(inode); |
396 | return; | |
7bc09003 | 397 | } |
06292073 | 398 | new_ie = f2fs_kmem_cache_alloc(inode_entry_slab, GFP_NOFS); |
7bc09003 | 399 | new_ie->inode = inode; |
f28e5034 CY |
400 | |
401 | f2fs_radix_tree_insert(&gc_list->iroot, inode->i_ino, new_ie); | |
7dda2af8 | 402 | list_add_tail(&new_ie->list, &gc_list->ilist); |
7bc09003 JK |
403 | } |
404 | ||
7dda2af8 | 405 | static void put_gc_inode(struct gc_inode_list *gc_list) |
7bc09003 JK |
406 | { |
407 | struct inode_entry *ie, *next_ie; | |
7dda2af8 CL |
408 | list_for_each_entry_safe(ie, next_ie, &gc_list->ilist, list) { |
409 | radix_tree_delete(&gc_list->iroot, ie->inode->i_ino); | |
7bc09003 JK |
410 | iput(ie->inode); |
411 | list_del(&ie->list); | |
06292073 | 412 | kmem_cache_free(inode_entry_slab, ie); |
7bc09003 JK |
413 | } |
414 | } | |
415 | ||
416 | static int check_valid_map(struct f2fs_sb_info *sbi, | |
417 | unsigned int segno, int offset) | |
418 | { | |
419 | struct sit_info *sit_i = SIT_I(sbi); | |
420 | struct seg_entry *sentry; | |
421 | int ret; | |
422 | ||
423 | mutex_lock(&sit_i->sentry_lock); | |
424 | sentry = get_seg_entry(sbi, segno); | |
425 | ret = f2fs_test_bit(offset, sentry->cur_valid_map); | |
426 | mutex_unlock(&sit_i->sentry_lock); | |
43727527 | 427 | return ret; |
7bc09003 JK |
428 | } |
429 | ||
0a8165d7 | 430 | /* |
7bc09003 JK |
431 | * This function compares node address got in summary with that in NAT. |
432 | * On validity, copy that node with cold status, otherwise (invalid node) | |
433 | * ignore that. | |
434 | */ | |
718e53fa | 435 | static void gc_node_segment(struct f2fs_sb_info *sbi, |
7bc09003 JK |
436 | struct f2fs_summary *sum, unsigned int segno, int gc_type) |
437 | { | |
7bc09003 | 438 | struct f2fs_summary *entry; |
26d58599 | 439 | block_t start_addr; |
7bc09003 | 440 | int off; |
7ea984b0 | 441 | int phase = 0; |
7bc09003 | 442 | |
26d58599 JK |
443 | start_addr = START_BLOCK(sbi, segno); |
444 | ||
7bc09003 JK |
445 | next_step: |
446 | entry = sum; | |
c718379b | 447 | |
7bc09003 JK |
448 | for (off = 0; off < sbi->blocks_per_seg; off++, entry++) { |
449 | nid_t nid = le32_to_cpu(entry->nid); | |
450 | struct page *node_page; | |
26d58599 | 451 | struct node_info ni; |
7bc09003 | 452 | |
43727527 | 453 | /* stop BG_GC if there is not enough free sections. */ |
7f3037a5 | 454 | if (gc_type == BG_GC && has_not_enough_free_secs(sbi, 0, 0)) |
718e53fa | 455 | return; |
7bc09003 | 456 | |
43727527 | 457 | if (check_valid_map(sbi, segno, off) == 0) |
7bc09003 JK |
458 | continue; |
459 | ||
7ea984b0 CY |
460 | if (phase == 0) { |
461 | ra_meta_pages(sbi, NAT_BLOCK_OFFSET(nid), 1, | |
462 | META_NAT, true); | |
463 | continue; | |
464 | } | |
465 | ||
466 | if (phase == 1) { | |
7bc09003 JK |
467 | ra_node_page(sbi, nid); |
468 | continue; | |
469 | } | |
7ea984b0 CY |
470 | |
471 | /* phase == 2 */ | |
7bc09003 JK |
472 | node_page = get_node_page(sbi, nid); |
473 | if (IS_ERR(node_page)) | |
474 | continue; | |
475 | ||
9a01b56b HY |
476 | /* block may become invalid during get_node_page */ |
477 | if (check_valid_map(sbi, segno, off) == 0) { | |
478 | f2fs_put_page(node_page, 1); | |
479 | continue; | |
26d58599 JK |
480 | } |
481 | ||
482 | get_node_info(sbi, nid, &ni); | |
483 | if (ni.blk_addr != start_addr + off) { | |
484 | f2fs_put_page(node_page, 1); | |
485 | continue; | |
9a01b56b HY |
486 | } |
487 | ||
da011cc0 | 488 | move_node_page(node_page, gc_type); |
e1235983 | 489 | stat_inc_node_blk_count(sbi, 1, gc_type); |
7bc09003 | 490 | } |
c718379b | 491 | |
7ea984b0 | 492 | if (++phase < 3) |
7bc09003 | 493 | goto next_step; |
7bc09003 JK |
494 | } |
495 | ||
0a8165d7 | 496 | /* |
9af45ef5 JK |
497 | * Calculate start block index indicating the given node offset. |
498 | * Be careful, caller should give this node offset only indicating direct node | |
499 | * blocks. If any node offsets, which point the other types of node blocks such | |
500 | * as indirect or double indirect node blocks, are given, it must be a caller's | |
501 | * bug. | |
7bc09003 | 502 | */ |
81ca7350 | 503 | block_t start_bidx_of_node(unsigned int node_ofs, struct inode *inode) |
7bc09003 | 504 | { |
ce19a5d4 JK |
505 | unsigned int indirect_blks = 2 * NIDS_PER_BLOCK + 4; |
506 | unsigned int bidx; | |
7bc09003 | 507 | |
ce19a5d4 JK |
508 | if (node_ofs == 0) |
509 | return 0; | |
7bc09003 | 510 | |
ce19a5d4 | 511 | if (node_ofs <= 2) { |
7bc09003 JK |
512 | bidx = node_ofs - 1; |
513 | } else if (node_ofs <= indirect_blks) { | |
ce19a5d4 | 514 | int dec = (node_ofs - 4) / (NIDS_PER_BLOCK + 1); |
7bc09003 JK |
515 | bidx = node_ofs - 2 - dec; |
516 | } else { | |
ce19a5d4 | 517 | int dec = (node_ofs - indirect_blks - 3) / (NIDS_PER_BLOCK + 1); |
7bc09003 JK |
518 | bidx = node_ofs - 5 - dec; |
519 | } | |
81ca7350 | 520 | return bidx * ADDRS_PER_BLOCK + ADDRS_PER_INODE(inode); |
7bc09003 JK |
521 | } |
522 | ||
c1079892 | 523 | static bool is_alive(struct f2fs_sb_info *sbi, struct f2fs_summary *sum, |
7bc09003 JK |
524 | struct node_info *dni, block_t blkaddr, unsigned int *nofs) |
525 | { | |
526 | struct page *node_page; | |
527 | nid_t nid; | |
528 | unsigned int ofs_in_node; | |
529 | block_t source_blkaddr; | |
530 | ||
531 | nid = le32_to_cpu(sum->nid); | |
532 | ofs_in_node = le16_to_cpu(sum->ofs_in_node); | |
533 | ||
534 | node_page = get_node_page(sbi, nid); | |
535 | if (IS_ERR(node_page)) | |
c1079892 | 536 | return false; |
7bc09003 JK |
537 | |
538 | get_node_info(sbi, nid, dni); | |
539 | ||
540 | if (sum->version != dni->version) { | |
541 | f2fs_put_page(node_page, 1); | |
c1079892 | 542 | return false; |
7bc09003 JK |
543 | } |
544 | ||
545 | *nofs = ofs_of_node(node_page); | |
546 | source_blkaddr = datablock_addr(node_page, ofs_in_node); | |
547 | f2fs_put_page(node_page, 1); | |
548 | ||
549 | if (source_blkaddr != blkaddr) | |
c1079892 NK |
550 | return false; |
551 | return true; | |
7bc09003 JK |
552 | } |
553 | ||
20614711 YH |
554 | static void move_encrypted_block(struct inode *inode, block_t bidx, |
555 | unsigned int segno, int off) | |
4375a336 JK |
556 | { |
557 | struct f2fs_io_info fio = { | |
558 | .sbi = F2FS_I_SB(inode), | |
559 | .type = DATA, | |
04d328de | 560 | .op = REQ_OP_READ, |
70fd7614 | 561 | .op_flags = 0, |
4375a336 JK |
562 | .encrypted_page = NULL, |
563 | }; | |
564 | struct dnode_of_data dn; | |
565 | struct f2fs_summary sum; | |
566 | struct node_info ni; | |
567 | struct page *page; | |
4356e48e | 568 | block_t newaddr; |
4375a336 JK |
569 | int err; |
570 | ||
571 | /* do not read out */ | |
a56c7c6f | 572 | page = f2fs_grab_cache_page(inode->i_mapping, bidx, false); |
4375a336 JK |
573 | if (!page) |
574 | return; | |
575 | ||
20614711 YH |
576 | if (!check_valid_map(F2FS_I_SB(inode), segno, off)) |
577 | goto out; | |
578 | ||
5fe45743 CY |
579 | if (f2fs_is_atomic_file(inode)) |
580 | goto out; | |
581 | ||
4375a336 JK |
582 | set_new_dnode(&dn, inode, NULL, NULL, 0); |
583 | err = get_dnode_of_data(&dn, bidx, LOOKUP_NODE); | |
584 | if (err) | |
585 | goto out; | |
586 | ||
08b39fbd CY |
587 | if (unlikely(dn.data_blkaddr == NULL_ADDR)) { |
588 | ClearPageUptodate(page); | |
4375a336 | 589 | goto put_out; |
08b39fbd CY |
590 | } |
591 | ||
592 | /* | |
593 | * don't cache encrypted data into meta inode until previous dirty | |
594 | * data were writebacked to avoid racing between GC and flush. | |
595 | */ | |
fec1d657 | 596 | f2fs_wait_on_page_writeback(page, DATA, true); |
4375a336 JK |
597 | |
598 | get_node_info(fio.sbi, dn.nid, &ni); | |
599 | set_summary(&sum, dn.nid, dn.ofs_in_node, ni.version); | |
600 | ||
601 | /* read page */ | |
602 | fio.page = page; | |
7a9d7548 | 603 | fio.new_blkaddr = fio.old_blkaddr = dn.data_blkaddr; |
4375a336 | 604 | |
4356e48e CY |
605 | allocate_data_block(fio.sbi, NULL, fio.old_blkaddr, &newaddr, |
606 | &sum, CURSEG_COLD_DATA); | |
607 | ||
608 | fio.encrypted_page = pagecache_get_page(META_MAPPING(fio.sbi), newaddr, | |
609 | FGP_LOCK | FGP_CREAT, GFP_NOFS); | |
610 | if (!fio.encrypted_page) { | |
611 | err = -ENOMEM; | |
612 | goto recover_block; | |
613 | } | |
4375a336 | 614 | |
548aedac JK |
615 | err = f2fs_submit_page_bio(&fio); |
616 | if (err) | |
617 | goto put_page_out; | |
618 | ||
619 | /* write page */ | |
620 | lock_page(fio.encrypted_page); | |
621 | ||
1563ac75 | 622 | if (unlikely(fio.encrypted_page->mapping != META_MAPPING(fio.sbi))) { |
4356e48e | 623 | err = -EIO; |
548aedac | 624 | goto put_page_out; |
4356e48e | 625 | } |
1563ac75 | 626 | if (unlikely(!PageUptodate(fio.encrypted_page))) { |
4356e48e | 627 | err = -EIO; |
548aedac | 628 | goto put_page_out; |
4356e48e | 629 | } |
548aedac | 630 | |
6282adbf | 631 | set_page_dirty(fio.encrypted_page); |
fec1d657 | 632 | f2fs_wait_on_page_writeback(fio.encrypted_page, DATA, true); |
6282adbf JK |
633 | if (clear_page_dirty_for_io(fio.encrypted_page)) |
634 | dec_page_count(fio.sbi, F2FS_DIRTY_META); | |
635 | ||
548aedac | 636 | set_page_writeback(fio.encrypted_page); |
4375a336 JK |
637 | |
638 | /* allocate block address */ | |
fec1d657 | 639 | f2fs_wait_on_page_writeback(dn.node_page, NODE, true); |
4356e48e | 640 | |
04d328de | 641 | fio.op = REQ_OP_WRITE; |
70fd7614 | 642 | fio.op_flags = REQ_SYNC; |
4356e48e | 643 | fio.new_blkaddr = newaddr; |
4375a336 JK |
644 | f2fs_submit_page_mbio(&fio); |
645 | ||
f28b3434 | 646 | f2fs_update_data_blkaddr(&dn, newaddr); |
91942321 | 647 | set_inode_flag(inode, FI_APPEND_WRITE); |
4375a336 | 648 | if (page->index == 0) |
91942321 | 649 | set_inode_flag(inode, FI_FIRST_BLOCK_WRITTEN); |
548aedac | 650 | put_page_out: |
4375a336 | 651 | f2fs_put_page(fio.encrypted_page, 1); |
4356e48e CY |
652 | recover_block: |
653 | if (err) | |
654 | __f2fs_replace_block(fio.sbi, &sum, newaddr, fio.old_blkaddr, | |
655 | true, true); | |
4375a336 JK |
656 | put_out: |
657 | f2fs_put_dnode(&dn); | |
658 | out: | |
659 | f2fs_put_page(page, 1); | |
660 | } | |
661 | ||
20614711 YH |
662 | static void move_data_page(struct inode *inode, block_t bidx, int gc_type, |
663 | unsigned int segno, int off) | |
7bc09003 | 664 | { |
c879f90d JK |
665 | struct page *page; |
666 | ||
a56c7c6f | 667 | page = get_lock_data_page(inode, bidx, true); |
c879f90d JK |
668 | if (IS_ERR(page)) |
669 | return; | |
63a0b7cb | 670 | |
20614711 YH |
671 | if (!check_valid_map(F2FS_I_SB(inode), segno, off)) |
672 | goto out; | |
673 | ||
5fe45743 CY |
674 | if (f2fs_is_atomic_file(inode)) |
675 | goto out; | |
676 | ||
7bc09003 | 677 | if (gc_type == BG_GC) { |
4ebefc44 JK |
678 | if (PageWriteback(page)) |
679 | goto out; | |
7bc09003 JK |
680 | set_page_dirty(page); |
681 | set_cold_data(page); | |
682 | } else { | |
c879f90d JK |
683 | struct f2fs_io_info fio = { |
684 | .sbi = F2FS_I_SB(inode), | |
685 | .type = DATA, | |
04d328de | 686 | .op = REQ_OP_WRITE, |
70fd7614 | 687 | .op_flags = REQ_SYNC, |
c879f90d | 688 | .page = page, |
4375a336 | 689 | .encrypted_page = NULL, |
c879f90d | 690 | }; |
72e1c797 CY |
691 | bool is_dirty = PageDirty(page); |
692 | int err; | |
693 | ||
694 | retry: | |
6282adbf | 695 | set_page_dirty(page); |
fec1d657 | 696 | f2fs_wait_on_page_writeback(page, DATA, true); |
933439c8 | 697 | if (clear_page_dirty_for_io(page)) { |
a7ffdbe2 | 698 | inode_dec_dirty_pages(inode); |
933439c8 CY |
699 | remove_dirty_inode(inode); |
700 | } | |
72e1c797 | 701 | |
7bc09003 | 702 | set_cold_data(page); |
72e1c797 CY |
703 | |
704 | err = do_write_data_page(&fio); | |
705 | if (err == -ENOMEM && is_dirty) { | |
706 | congestion_wait(BLK_RW_ASYNC, HZ/50); | |
707 | goto retry; | |
708 | } | |
7bc09003 JK |
709 | } |
710 | out: | |
711 | f2fs_put_page(page, 1); | |
712 | } | |
713 | ||
0a8165d7 | 714 | /* |
7bc09003 JK |
715 | * This function tries to get parent node of victim data block, and identifies |
716 | * data block validity. If the block is valid, copy that with cold status and | |
717 | * modify parent node. | |
718 | * If the parent node is not valid or the data block address is different, | |
719 | * the victim data block is ignored. | |
720 | */ | |
718e53fa | 721 | static void gc_data_segment(struct f2fs_sb_info *sbi, struct f2fs_summary *sum, |
7dda2af8 | 722 | struct gc_inode_list *gc_list, unsigned int segno, int gc_type) |
7bc09003 JK |
723 | { |
724 | struct super_block *sb = sbi->sb; | |
725 | struct f2fs_summary *entry; | |
726 | block_t start_addr; | |
43727527 | 727 | int off; |
7bc09003 JK |
728 | int phase = 0; |
729 | ||
730 | start_addr = START_BLOCK(sbi, segno); | |
731 | ||
732 | next_step: | |
733 | entry = sum; | |
c718379b | 734 | |
7bc09003 JK |
735 | for (off = 0; off < sbi->blocks_per_seg; off++, entry++) { |
736 | struct page *data_page; | |
737 | struct inode *inode; | |
738 | struct node_info dni; /* dnode info for the data */ | |
739 | unsigned int ofs_in_node, nofs; | |
740 | block_t start_bidx; | |
7ea984b0 | 741 | nid_t nid = le32_to_cpu(entry->nid); |
7bc09003 | 742 | |
43727527 | 743 | /* stop BG_GC if there is not enough free sections. */ |
7f3037a5 | 744 | if (gc_type == BG_GC && has_not_enough_free_secs(sbi, 0, 0)) |
718e53fa | 745 | return; |
7bc09003 | 746 | |
43727527 | 747 | if (check_valid_map(sbi, segno, off) == 0) |
7bc09003 JK |
748 | continue; |
749 | ||
750 | if (phase == 0) { | |
7ea984b0 CY |
751 | ra_meta_pages(sbi, NAT_BLOCK_OFFSET(nid), 1, |
752 | META_NAT, true); | |
753 | continue; | |
754 | } | |
755 | ||
756 | if (phase == 1) { | |
757 | ra_node_page(sbi, nid); | |
7bc09003 JK |
758 | continue; |
759 | } | |
760 | ||
761 | /* Get an inode by ino with checking validity */ | |
c1079892 | 762 | if (!is_alive(sbi, entry, &dni, start_addr + off, &nofs)) |
7bc09003 JK |
763 | continue; |
764 | ||
7ea984b0 | 765 | if (phase == 2) { |
7bc09003 JK |
766 | ra_node_page(sbi, dni.ino); |
767 | continue; | |
768 | } | |
769 | ||
7bc09003 JK |
770 | ofs_in_node = le16_to_cpu(entry->ofs_in_node); |
771 | ||
7ea984b0 | 772 | if (phase == 3) { |
d4686d56 | 773 | inode = f2fs_iget(sb, dni.ino); |
b73e5282 | 774 | if (IS_ERR(inode) || is_bad_inode(inode)) |
7bc09003 JK |
775 | continue; |
776 | ||
4375a336 JK |
777 | /* if encrypted inode, let's go phase 3 */ |
778 | if (f2fs_encrypted_inode(inode) && | |
779 | S_ISREG(inode->i_mode)) { | |
780 | add_gc_inode(gc_list, inode); | |
781 | continue; | |
782 | } | |
783 | ||
81ca7350 | 784 | start_bidx = start_bidx_of_node(nofs, inode); |
43f3eae1 | 785 | data_page = get_read_data_page(inode, |
70246286 CH |
786 | start_bidx + ofs_in_node, REQ_RAHEAD, |
787 | true); | |
31a32688 CL |
788 | if (IS_ERR(data_page)) { |
789 | iput(inode); | |
790 | continue; | |
791 | } | |
7bc09003 JK |
792 | |
793 | f2fs_put_page(data_page, 0); | |
7dda2af8 | 794 | add_gc_inode(gc_list, inode); |
31a32688 CL |
795 | continue; |
796 | } | |
797 | ||
7ea984b0 | 798 | /* phase 4 */ |
7dda2af8 | 799 | inode = find_gc_inode(gc_list, dni.ino); |
31a32688 | 800 | if (inode) { |
82e0a5aa CY |
801 | struct f2fs_inode_info *fi = F2FS_I(inode); |
802 | bool locked = false; | |
803 | ||
804 | if (S_ISREG(inode->i_mode)) { | |
805 | if (!down_write_trylock(&fi->dio_rwsem[READ])) | |
806 | continue; | |
807 | if (!down_write_trylock( | |
808 | &fi->dio_rwsem[WRITE])) { | |
809 | up_write(&fi->dio_rwsem[READ]); | |
810 | continue; | |
811 | } | |
812 | locked = true; | |
813 | } | |
814 | ||
81ca7350 | 815 | start_bidx = start_bidx_of_node(nofs, inode) |
c879f90d | 816 | + ofs_in_node; |
4375a336 | 817 | if (f2fs_encrypted_inode(inode) && S_ISREG(inode->i_mode)) |
20614711 | 818 | move_encrypted_block(inode, start_bidx, segno, off); |
4375a336 | 819 | else |
20614711 | 820 | move_data_page(inode, start_bidx, gc_type, segno, off); |
82e0a5aa CY |
821 | |
822 | if (locked) { | |
823 | up_write(&fi->dio_rwsem[WRITE]); | |
824 | up_write(&fi->dio_rwsem[READ]); | |
825 | } | |
826 | ||
e1235983 | 827 | stat_inc_data_blk_count(sbi, 1, gc_type); |
7bc09003 | 828 | } |
7bc09003 | 829 | } |
c718379b | 830 | |
7ea984b0 | 831 | if (++phase < 5) |
7bc09003 | 832 | goto next_step; |
7bc09003 JK |
833 | } |
834 | ||
835 | static int __get_victim(struct f2fs_sb_info *sbi, unsigned int *victim, | |
8a2d0ace | 836 | int gc_type) |
7bc09003 JK |
837 | { |
838 | struct sit_info *sit_i = SIT_I(sbi); | |
839 | int ret; | |
8a2d0ace | 840 | |
7bc09003 | 841 | mutex_lock(&sit_i->sentry_lock); |
8a2d0ace GZ |
842 | ret = DIRTY_I(sbi)->v_ops->get_victim(sbi, victim, gc_type, |
843 | NO_CHECK_TYPE, LFS); | |
7bc09003 JK |
844 | mutex_unlock(&sit_i->sentry_lock); |
845 | return ret; | |
846 | } | |
847 | ||
718e53fa CY |
848 | static int do_garbage_collect(struct f2fs_sb_info *sbi, |
849 | unsigned int start_segno, | |
7dda2af8 | 850 | struct gc_inode_list *gc_list, int gc_type) |
7bc09003 JK |
851 | { |
852 | struct page *sum_page; | |
853 | struct f2fs_summary_block *sum; | |
c718379b | 854 | struct blk_plug plug; |
718e53fa CY |
855 | unsigned int segno = start_segno; |
856 | unsigned int end_segno = start_segno + sbi->segs_per_sec; | |
43ced84e | 857 | int sec_freed = 0; |
718e53fa CY |
858 | unsigned char type = IS_DATASEG(get_seg_entry(sbi, segno)->type) ? |
859 | SUM_TYPE_DATA : SUM_TYPE_NODE; | |
7bc09003 | 860 | |
718e53fa CY |
861 | /* readahead multi ssa blocks those have contiguous address */ |
862 | if (sbi->segs_per_sec > 1) | |
863 | ra_meta_pages(sbi, GET_SUM_BLOCK(sbi, segno), | |
864 | sbi->segs_per_sec, META_SSA, true); | |
865 | ||
866 | /* reference all summary page */ | |
867 | while (segno < end_segno) { | |
868 | sum_page = get_sum_page(sbi, segno++); | |
869 | unlock_page(sum_page); | |
870 | } | |
7bc09003 | 871 | |
c718379b JK |
872 | blk_start_plug(&plug); |
873 | ||
718e53fa | 874 | for (segno = start_segno; segno < end_segno; segno++) { |
aa987273 | 875 | |
718e53fa CY |
876 | /* find segment summary of victim */ |
877 | sum_page = find_get_page(META_MAPPING(sbi), | |
878 | GET_SUM_BLOCK(sbi, segno)); | |
718e53fa | 879 | f2fs_put_page(sum_page, 0); |
7bc09003 | 880 | |
de0dcc40 JK |
881 | if (get_valid_blocks(sbi, segno, 1) == 0 || |
882 | !PageUptodate(sum_page) || | |
883 | unlikely(f2fs_cp_error(sbi))) | |
884 | goto next; | |
885 | ||
718e53fa CY |
886 | sum = page_address(sum_page); |
887 | f2fs_bug_on(sbi, type != GET_SUM_TYPE((&sum->footer))); | |
888 | ||
889 | /* | |
890 | * this is to avoid deadlock: | |
891 | * - lock_page(sum_page) - f2fs_replace_block | |
892 | * - check_valid_map() - mutex_lock(sentry_lock) | |
893 | * - mutex_lock(sentry_lock) - change_curseg() | |
894 | * - lock_page(sum_page) | |
895 | */ | |
896 | ||
897 | if (type == SUM_TYPE_NODE) | |
898 | gc_node_segment(sbi, sum->entries, segno, gc_type); | |
899 | else | |
900 | gc_data_segment(sbi, sum->entries, gc_list, segno, | |
901 | gc_type); | |
902 | ||
903 | stat_inc_seg_count(sbi, type, gc_type); | |
f6fe2be3 | 904 | next: |
718e53fa CY |
905 | f2fs_put_page(sum_page, 0); |
906 | } | |
907 | ||
da011cc0 CY |
908 | if (gc_type == FG_GC) |
909 | f2fs_submit_merged_bio(sbi, | |
910 | (type == SUM_TYPE_NODE) ? NODE : DATA, WRITE); | |
c718379b | 911 | |
718e53fa | 912 | blk_finish_plug(&plug); |
7bc09003 | 913 | |
43ced84e CY |
914 | if (gc_type == FG_GC && |
915 | get_valid_blocks(sbi, start_segno, sbi->segs_per_sec) == 0) | |
916 | sec_freed = 1; | |
17d899df CY |
917 | |
918 | stat_inc_call_count(sbi->stat_info); | |
919 | ||
43ced84e | 920 | return sec_freed; |
7bc09003 JK |
921 | } |
922 | ||
7702bdbe | 923 | int f2fs_gc(struct f2fs_sb_info *sbi, bool sync, bool background) |
7bc09003 | 924 | { |
718e53fa | 925 | unsigned int segno; |
d530d4d8 | 926 | int gc_type = sync ? FG_GC : BG_GC; |
43ced84e | 927 | int sec_freed = 0; |
d530d4d8 | 928 | int ret = -EINVAL; |
d5053a34 | 929 | struct cp_control cpc; |
7dda2af8 CL |
930 | struct gc_inode_list gc_list = { |
931 | .ilist = LIST_HEAD_INIT(gc_list.ilist), | |
769ec6e5 | 932 | .iroot = RADIX_TREE_INIT(GFP_NOFS), |
7dda2af8 | 933 | }; |
d5053a34 | 934 | |
119ee914 | 935 | cpc.reason = __get_cp_reason(sbi); |
7bc09003 | 936 | gc_more: |
6bacf52f | 937 | if (unlikely(!(sbi->sb->s_flags & MS_ACTIVE))) |
408e9375 | 938 | goto stop; |
6d5a1495 CY |
939 | if (unlikely(f2fs_cp_error(sbi))) { |
940 | ret = -EIO; | |
203681f6 | 941 | goto stop; |
6d5a1495 | 942 | } |
7bc09003 | 943 | |
7f3037a5 | 944 | if (gc_type == BG_GC && has_not_enough_free_secs(sbi, sec_freed, 0)) { |
408e9375 | 945 | gc_type = FG_GC; |
6e17bfbc JK |
946 | /* |
947 | * If there is no victim and no prefree segment but still not | |
948 | * enough free sections, we should flush dent/node blocks and do | |
949 | * garbage collections. | |
950 | */ | |
05eeb118 | 951 | if (dirty_segments(sbi) || prefree_segments(sbi)) { |
2956e450 JK |
952 | ret = write_checkpoint(sbi, &cpc); |
953 | if (ret) | |
954 | goto stop; | |
7f3037a5 | 955 | } else if (has_not_enough_free_secs(sbi, 0, 0)) { |
2956e450 JK |
956 | ret = write_checkpoint(sbi, &cpc); |
957 | if (ret) | |
958 | goto stop; | |
fe94793e | 959 | } |
7702bdbe JK |
960 | } else if (gc_type == BG_GC && !background) { |
961 | /* f2fs_balance_fs doesn't need to do BG_GC in critical path. */ | |
962 | goto stop; | |
d64f8047 | 963 | } |
7bc09003 | 964 | |
05eeb118 | 965 | if (!__get_victim(sbi, &segno, gc_type)) |
408e9375 | 966 | goto stop; |
43727527 | 967 | ret = 0; |
7bc09003 | 968 | |
43ced84e CY |
969 | if (do_garbage_collect(sbi, segno, &gc_list, gc_type) && |
970 | gc_type == FG_GC) | |
45fe8492 | 971 | sec_freed++; |
43727527 | 972 | |
5ee5293c | 973 | if (gc_type == FG_GC) |
5ec4e49f | 974 | sbi->cur_victim_sec = NULL_SEGNO; |
43727527 | 975 | |
d530d4d8 | 976 | if (!sync) { |
7f3037a5 | 977 | if (has_not_enough_free_secs(sbi, sec_freed, 0)) |
d530d4d8 | 978 | goto gc_more; |
43727527 | 979 | |
d530d4d8 | 980 | if (gc_type == FG_GC) |
2956e450 | 981 | ret = write_checkpoint(sbi, &cpc); |
d530d4d8 | 982 | } |
408e9375 | 983 | stop: |
7bc09003 JK |
984 | mutex_unlock(&sbi->gc_mutex); |
985 | ||
7dda2af8 | 986 | put_gc_inode(&gc_list); |
d530d4d8 CY |
987 | |
988 | if (sync) | |
989 | ret = sec_freed ? 0 : -EAGAIN; | |
43727527 | 990 | return ret; |
7bc09003 JK |
991 | } |
992 | ||
993 | void build_gc_manager(struct f2fs_sb_info *sbi) | |
994 | { | |
e93b9865 HP |
995 | u64 main_count, resv_count, ovp_count, blocks_per_sec; |
996 | ||
7bc09003 | 997 | DIRTY_I(sbi)->v_ops = &default_v_ops; |
e93b9865 HP |
998 | |
999 | /* threshold of # of valid blocks in a section for victims of FG_GC */ | |
1000 | main_count = SM_I(sbi)->main_segments << sbi->log_blocks_per_seg; | |
1001 | resv_count = SM_I(sbi)->reserved_segments << sbi->log_blocks_per_seg; | |
1002 | ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg; | |
1003 | blocks_per_sec = sbi->blocks_per_seg * sbi->segs_per_sec; | |
1004 | ||
1005 | sbi->fggc_threshold = div_u64((main_count - ovp_count) * blocks_per_sec, | |
1006 | (main_count - resv_count)); | |
7bc09003 | 1007 | } |