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8#include <linux/fs.h>
9#include <linux/module.h>
10#include <linux/init.h>
11#include <linux/f2fs_fs.h>
12#include <linux/kthread.h>
13#include <linux/delay.h>
14#include <linux/freezer.h>
15#include <linux/sched/signal.h>
16#include <linux/random.h>
17#include <linux/sched/mm.h>
18
19#include "f2fs.h"
20#include "node.h"
21#include "segment.h"
22#include "gc.h"
23#include "iostat.h"
24#include <trace/events/f2fs.h>
25
26static struct kmem_cache *victim_entry_slab;
27
28static unsigned int count_bits(const unsigned long *addr,
29 unsigned int offset, unsigned int len);
30
31static int gc_thread_func(void *data)
32{
33 struct f2fs_sb_info *sbi = data;
34 struct f2fs_gc_kthread *gc_th = sbi->gc_thread;
35 wait_queue_head_t *wq = &sbi->gc_thread->gc_wait_queue_head;
36 wait_queue_head_t *fggc_wq = &sbi->gc_thread->fggc_wq;
37 unsigned int wait_ms;
38
39 wait_ms = gc_th->min_sleep_time;
40
41 set_freezable();
42 do {
43 bool sync_mode, foreground = false;
44
45 wait_event_interruptible_timeout(*wq,
46 kthread_should_stop() || freezing(current) ||
47 waitqueue_active(fggc_wq) ||
48 gc_th->gc_wake,
49 msecs_to_jiffies(wait_ms));
50
51 if (test_opt(sbi, GC_MERGE) && waitqueue_active(fggc_wq))
52 foreground = true;
53
54
55 if (gc_th->gc_wake)
56 gc_th->gc_wake = 0;
57
58 if (try_to_freeze()) {
59 stat_other_skip_bggc_count(sbi);
60 continue;
61 }
62 if (kthread_should_stop())
63 break;
64
65 if (sbi->sb->s_writers.frozen >= SB_FREEZE_WRITE) {
66 increase_sleep_time(gc_th, &wait_ms);
67 stat_other_skip_bggc_count(sbi);
68 continue;
69 }
70
71 if (time_to_inject(sbi, FAULT_CHECKPOINT)) {
72 f2fs_show_injection_info(sbi, FAULT_CHECKPOINT);
73 f2fs_stop_checkpoint(sbi, false);
74 }
75
76 if (!sb_start_write_trylock(sbi->sb)) {
77 stat_other_skip_bggc_count(sbi);
78 continue;
79 }
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94 if (sbi->gc_mode == GC_URGENT_HIGH) {
95 spin_lock(&sbi->gc_urgent_high_lock);
96 if (sbi->gc_urgent_high_limited) {
97 if (!sbi->gc_urgent_high_remaining) {
98 sbi->gc_urgent_high_limited = false;
99 spin_unlock(&sbi->gc_urgent_high_lock);
100 sbi->gc_mode = GC_NORMAL;
101 continue;
102 }
103 sbi->gc_urgent_high_remaining--;
104 }
105 spin_unlock(&sbi->gc_urgent_high_lock);
106
107 wait_ms = gc_th->urgent_sleep_time;
108 down_write(&sbi->gc_lock);
109 goto do_gc;
110 }
111
112 if (foreground) {
113 down_write(&sbi->gc_lock);
114 goto do_gc;
115 } else if (!down_write_trylock(&sbi->gc_lock)) {
116 stat_other_skip_bggc_count(sbi);
117 goto next;
118 }
119
120 if (!is_idle(sbi, GC_TIME)) {
121 increase_sleep_time(gc_th, &wait_ms);
122 up_write(&sbi->gc_lock);
123 stat_io_skip_bggc_count(sbi);
124 goto next;
125 }
126
127 if (has_enough_invalid_blocks(sbi))
128 decrease_sleep_time(gc_th, &wait_ms);
129 else
130 increase_sleep_time(gc_th, &wait_ms);
131do_gc:
132 if (!foreground)
133 stat_inc_bggc_count(sbi->stat_info);
134
135 sync_mode = F2FS_OPTION(sbi).bggc_mode == BGGC_MODE_SYNC;
136
137
138 if (foreground)
139 sync_mode = false;
140
141
142 if (f2fs_gc(sbi, sync_mode, !foreground, false, NULL_SEGNO))
143 wait_ms = gc_th->no_gc_sleep_time;
144
145 if (foreground)
146 wake_up_all(&gc_th->fggc_wq);
147
148 trace_f2fs_background_gc(sbi->sb, wait_ms,
149 prefree_segments(sbi), free_segments(sbi));
150
151
152 f2fs_balance_fs_bg(sbi, true);
153next:
154 sb_end_write(sbi->sb);
155
156 } while (!kthread_should_stop());
157 return 0;
158}
159
160int f2fs_start_gc_thread(struct f2fs_sb_info *sbi)
161{
162 struct f2fs_gc_kthread *gc_th;
163 dev_t dev = sbi->sb->s_bdev->bd_dev;
164 int err = 0;
165
166 gc_th = f2fs_kmalloc(sbi, sizeof(struct f2fs_gc_kthread), GFP_KERNEL);
167 if (!gc_th) {
168 err = -ENOMEM;
169 goto out;
170 }
171
172 gc_th->urgent_sleep_time = DEF_GC_THREAD_URGENT_SLEEP_TIME;
173 gc_th->min_sleep_time = DEF_GC_THREAD_MIN_SLEEP_TIME;
174 gc_th->max_sleep_time = DEF_GC_THREAD_MAX_SLEEP_TIME;
175 gc_th->no_gc_sleep_time = DEF_GC_THREAD_NOGC_SLEEP_TIME;
176
177 gc_th->gc_wake = 0;
178
179 sbi->gc_thread = gc_th;
180 init_waitqueue_head(&sbi->gc_thread->gc_wait_queue_head);
181 init_waitqueue_head(&sbi->gc_thread->fggc_wq);
182 sbi->gc_thread->f2fs_gc_task = kthread_run(gc_thread_func, sbi,
183 "f2fs_gc-%u:%u", MAJOR(dev), MINOR(dev));
184 if (IS_ERR(gc_th->f2fs_gc_task)) {
185 err = PTR_ERR(gc_th->f2fs_gc_task);
186 kfree(gc_th);
187 sbi->gc_thread = NULL;
188 }
189out:
190 return err;
191}
192
193void f2fs_stop_gc_thread(struct f2fs_sb_info *sbi)
194{
195 struct f2fs_gc_kthread *gc_th = sbi->gc_thread;
196
197 if (!gc_th)
198 return;
199 kthread_stop(gc_th->f2fs_gc_task);
200 wake_up_all(&gc_th->fggc_wq);
201 kfree(gc_th);
202 sbi->gc_thread = NULL;
203}
204
205static int select_gc_type(struct f2fs_sb_info *sbi, int gc_type)
206{
207 int gc_mode;
208
209 if (gc_type == BG_GC) {
210 if (sbi->am.atgc_enabled)
211 gc_mode = GC_AT;
212 else
213 gc_mode = GC_CB;
214 } else {
215 gc_mode = GC_GREEDY;
216 }
217
218 switch (sbi->gc_mode) {
219 case GC_IDLE_CB:
220 gc_mode = GC_CB;
221 break;
222 case GC_IDLE_GREEDY:
223 case GC_URGENT_HIGH:
224 gc_mode = GC_GREEDY;
225 break;
226 case GC_IDLE_AT:
227 gc_mode = GC_AT;
228 break;
229 }
230
231 return gc_mode;
232}
233
234static void select_policy(struct f2fs_sb_info *sbi, int gc_type,
235 int type, struct victim_sel_policy *p)
236{
237 struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
238
239 if (p->alloc_mode == SSR) {
240 p->gc_mode = GC_GREEDY;
241 p->dirty_bitmap = dirty_i->dirty_segmap[type];
242 p->max_search = dirty_i->nr_dirty[type];
243 p->ofs_unit = 1;
244 } else if (p->alloc_mode == AT_SSR) {
245 p->gc_mode = GC_GREEDY;
246 p->dirty_bitmap = dirty_i->dirty_segmap[type];
247 p->max_search = dirty_i->nr_dirty[type];
248 p->ofs_unit = 1;
249 } else {
250 p->gc_mode = select_gc_type(sbi, gc_type);
251 p->ofs_unit = sbi->segs_per_sec;
252 if (__is_large_section(sbi)) {
253 p->dirty_bitmap = dirty_i->dirty_secmap;
254 p->max_search = count_bits(p->dirty_bitmap,
255 0, MAIN_SECS(sbi));
256 } else {
257 p->dirty_bitmap = dirty_i->dirty_segmap[DIRTY];
258 p->max_search = dirty_i->nr_dirty[DIRTY];
259 }
260 }
261
262
263
264
265
266 if (gc_type != FG_GC &&
267 (sbi->gc_mode != GC_URGENT_HIGH) &&
268 (p->gc_mode != GC_AT && p->alloc_mode != AT_SSR) &&
269 p->max_search > sbi->max_victim_search)
270 p->max_search = sbi->max_victim_search;
271
272
273 if (f2fs_need_rand_seg(sbi))
274 p->offset = prandom_u32() % (MAIN_SECS(sbi) * sbi->segs_per_sec);
275 else if (test_opt(sbi, NOHEAP) &&
276 (type == CURSEG_HOT_DATA || IS_NODESEG(type)))
277 p->offset = 0;
278 else
279 p->offset = SIT_I(sbi)->last_victim[p->gc_mode];
280}
281
282static unsigned int get_max_cost(struct f2fs_sb_info *sbi,
283 struct victim_sel_policy *p)
284{
285
286 if (p->alloc_mode == SSR)
287 return sbi->blocks_per_seg;
288 else if (p->alloc_mode == AT_SSR)
289 return UINT_MAX;
290
291
292 if (p->gc_mode == GC_GREEDY)
293 return 2 * sbi->blocks_per_seg * p->ofs_unit;
294 else if (p->gc_mode == GC_CB)
295 return UINT_MAX;
296 else if (p->gc_mode == GC_AT)
297 return UINT_MAX;
298 else
299 return 0;
300}
301
302static unsigned int check_bg_victims(struct f2fs_sb_info *sbi)
303{
304 struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
305 unsigned int secno;
306
307
308
309
310
311
312 for_each_set_bit(secno, dirty_i->victim_secmap, MAIN_SECS(sbi)) {
313 if (sec_usage_check(sbi, secno))
314 continue;
315 clear_bit(secno, dirty_i->victim_secmap);
316 return GET_SEG_FROM_SEC(sbi, secno);
317 }
318 return NULL_SEGNO;
319}
320
321static unsigned int get_cb_cost(struct f2fs_sb_info *sbi, unsigned int segno)
322{
323 struct sit_info *sit_i = SIT_I(sbi);
324 unsigned int secno = GET_SEC_FROM_SEG(sbi, segno);
325 unsigned int start = GET_SEG_FROM_SEC(sbi, secno);
326 unsigned long long mtime = 0;
327 unsigned int vblocks;
328 unsigned char age = 0;
329 unsigned char u;
330 unsigned int i;
331 unsigned int usable_segs_per_sec = f2fs_usable_segs_in_sec(sbi, segno);
332
333 for (i = 0; i < usable_segs_per_sec; i++)
334 mtime += get_seg_entry(sbi, start + i)->mtime;
335 vblocks = get_valid_blocks(sbi, segno, true);
336
337 mtime = div_u64(mtime, usable_segs_per_sec);
338 vblocks = div_u64(vblocks, usable_segs_per_sec);
339
340 u = (vblocks * 100) >> sbi->log_blocks_per_seg;
341
342
343 if (mtime < sit_i->min_mtime)
344 sit_i->min_mtime = mtime;
345 if (mtime > sit_i->max_mtime)
346 sit_i->max_mtime = mtime;
347 if (sit_i->max_mtime != sit_i->min_mtime)
348 age = 100 - div64_u64(100 * (mtime - sit_i->min_mtime),
349 sit_i->max_mtime - sit_i->min_mtime);
350
351 return UINT_MAX - ((100 * (100 - u) * age) / (100 + u));
352}
353
354static inline unsigned int get_gc_cost(struct f2fs_sb_info *sbi,
355 unsigned int segno, struct victim_sel_policy *p)
356{
357 if (p->alloc_mode == SSR)
358 return get_seg_entry(sbi, segno)->ckpt_valid_blocks;
359
360
361 if (p->gc_mode == GC_GREEDY)
362 return get_valid_blocks(sbi, segno, true);
363 else if (p->gc_mode == GC_CB)
364 return get_cb_cost(sbi, segno);
365
366 f2fs_bug_on(sbi, 1);
367 return 0;
368}
369
370static unsigned int count_bits(const unsigned long *addr,
371 unsigned int offset, unsigned int len)
372{
373 unsigned int end = offset + len, sum = 0;
374
375 while (offset < end) {
376 if (test_bit(offset++, addr))
377 ++sum;
378 }
379 return sum;
380}
381
382static struct victim_entry *attach_victim_entry(struct f2fs_sb_info *sbi,
383 unsigned long long mtime, unsigned int segno,
384 struct rb_node *parent, struct rb_node **p,
385 bool left_most)
386{
387 struct atgc_management *am = &sbi->am;
388 struct victim_entry *ve;
389
390 ve = f2fs_kmem_cache_alloc(victim_entry_slab,
391 GFP_NOFS, true, NULL);
392
393 ve->mtime = mtime;
394 ve->segno = segno;
395
396 rb_link_node(&ve->rb_node, parent, p);
397 rb_insert_color_cached(&ve->rb_node, &am->root, left_most);
398
399 list_add_tail(&ve->list, &am->victim_list);
400
401 am->victim_count++;
402
403 return ve;
404}
405
406static void insert_victim_entry(struct f2fs_sb_info *sbi,
407 unsigned long long mtime, unsigned int segno)
408{
409 struct atgc_management *am = &sbi->am;
410 struct rb_node **p;
411 struct rb_node *parent = NULL;
412 bool left_most = true;
413
414 p = f2fs_lookup_rb_tree_ext(sbi, &am->root, &parent, mtime, &left_most);
415 attach_victim_entry(sbi, mtime, segno, parent, p, left_most);
416}
417
418static void add_victim_entry(struct f2fs_sb_info *sbi,
419 struct victim_sel_policy *p, unsigned int segno)
420{
421 struct sit_info *sit_i = SIT_I(sbi);
422 unsigned int secno = GET_SEC_FROM_SEG(sbi, segno);
423 unsigned int start = GET_SEG_FROM_SEC(sbi, secno);
424 unsigned long long mtime = 0;
425 unsigned int i;
426
427 if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED))) {
428 if (p->gc_mode == GC_AT &&
429 get_valid_blocks(sbi, segno, true) == 0)
430 return;
431 }
432
433 for (i = 0; i < sbi->segs_per_sec; i++)
434 mtime += get_seg_entry(sbi, start + i)->mtime;
435 mtime = div_u64(mtime, sbi->segs_per_sec);
436
437
438 if (mtime < sit_i->min_mtime)
439 sit_i->min_mtime = mtime;
440 if (mtime > sit_i->max_mtime)
441 sit_i->max_mtime = mtime;
442 if (mtime < sit_i->dirty_min_mtime)
443 sit_i->dirty_min_mtime = mtime;
444 if (mtime > sit_i->dirty_max_mtime)
445 sit_i->dirty_max_mtime = mtime;
446
447
448 if (sit_i->dirty_max_mtime - mtime < p->age_threshold)
449 return;
450
451 insert_victim_entry(sbi, mtime, segno);
452}
453
454static struct rb_node *lookup_central_victim(struct f2fs_sb_info *sbi,
455 struct victim_sel_policy *p)
456{
457 struct atgc_management *am = &sbi->am;
458 struct rb_node *parent = NULL;
459 bool left_most;
460
461 f2fs_lookup_rb_tree_ext(sbi, &am->root, &parent, p->age, &left_most);
462
463 return parent;
464}
465
466static void atgc_lookup_victim(struct f2fs_sb_info *sbi,
467 struct victim_sel_policy *p)
468{
469 struct sit_info *sit_i = SIT_I(sbi);
470 struct atgc_management *am = &sbi->am;
471 struct rb_root_cached *root = &am->root;
472 struct rb_node *node;
473 struct rb_entry *re;
474 struct victim_entry *ve;
475 unsigned long long total_time;
476 unsigned long long age, u, accu;
477 unsigned long long max_mtime = sit_i->dirty_max_mtime;
478 unsigned long long min_mtime = sit_i->dirty_min_mtime;
479 unsigned int sec_blocks = BLKS_PER_SEC(sbi);
480 unsigned int vblocks;
481 unsigned int dirty_threshold = max(am->max_candidate_count,
482 am->candidate_ratio *
483 am->victim_count / 100);
484 unsigned int age_weight = am->age_weight;
485 unsigned int cost;
486 unsigned int iter = 0;
487
488 if (max_mtime < min_mtime)
489 return;
490
491 max_mtime += 1;
492 total_time = max_mtime - min_mtime;
493
494 accu = div64_u64(ULLONG_MAX, total_time);
495 accu = min_t(unsigned long long, div_u64(accu, 100),
496 DEFAULT_ACCURACY_CLASS);
497
498 node = rb_first_cached(root);
499next:
500 re = rb_entry_safe(node, struct rb_entry, rb_node);
501 if (!re)
502 return;
503
504 ve = (struct victim_entry *)re;
505
506 if (ve->mtime >= max_mtime || ve->mtime < min_mtime)
507 goto skip;
508
509
510 age = div64_u64(accu * (max_mtime - ve->mtime), total_time) *
511 age_weight;
512
513 vblocks = get_valid_blocks(sbi, ve->segno, true);
514 f2fs_bug_on(sbi, !vblocks || vblocks == sec_blocks);
515
516
517 u = div64_u64(accu * (sec_blocks - vblocks), sec_blocks) *
518 (100 - age_weight);
519
520 f2fs_bug_on(sbi, age + u >= UINT_MAX);
521
522 cost = UINT_MAX - (age + u);
523 iter++;
524
525 if (cost < p->min_cost ||
526 (cost == p->min_cost && age > p->oldest_age)) {
527 p->min_cost = cost;
528 p->oldest_age = age;
529 p->min_segno = ve->segno;
530 }
531skip:
532 if (iter < dirty_threshold) {
533 node = rb_next(node);
534 goto next;
535 }
536}
537
538
539
540
541
542static void atssr_lookup_victim(struct f2fs_sb_info *sbi,
543 struct victim_sel_policy *p)
544{
545 struct sit_info *sit_i = SIT_I(sbi);
546 struct atgc_management *am = &sbi->am;
547 struct rb_node *node;
548 struct rb_entry *re;
549 struct victim_entry *ve;
550 unsigned long long age;
551 unsigned long long max_mtime = sit_i->dirty_max_mtime;
552 unsigned long long min_mtime = sit_i->dirty_min_mtime;
553 unsigned int seg_blocks = sbi->blocks_per_seg;
554 unsigned int vblocks;
555 unsigned int dirty_threshold = max(am->max_candidate_count,
556 am->candidate_ratio *
557 am->victim_count / 100);
558 unsigned int cost;
559 unsigned int iter = 0;
560 int stage = 0;
561
562 if (max_mtime < min_mtime)
563 return;
564 max_mtime += 1;
565next_stage:
566 node = lookup_central_victim(sbi, p);
567next_node:
568 re = rb_entry_safe(node, struct rb_entry, rb_node);
569 if (!re) {
570 if (stage == 0)
571 goto skip_stage;
572 return;
573 }
574
575 ve = (struct victim_entry *)re;
576
577 if (ve->mtime >= max_mtime || ve->mtime < min_mtime)
578 goto skip_node;
579
580 age = max_mtime - ve->mtime;
581
582 vblocks = get_seg_entry(sbi, ve->segno)->ckpt_valid_blocks;
583 f2fs_bug_on(sbi, !vblocks);
584
585
586 if (vblocks == seg_blocks)
587 goto skip_node;
588
589 iter++;
590
591 age = max_mtime - abs(p->age - age);
592 cost = UINT_MAX - vblocks;
593
594 if (cost < p->min_cost ||
595 (cost == p->min_cost && age > p->oldest_age)) {
596 p->min_cost = cost;
597 p->oldest_age = age;
598 p->min_segno = ve->segno;
599 }
600skip_node:
601 if (iter < dirty_threshold) {
602 if (stage == 0)
603 node = rb_prev(node);
604 else if (stage == 1)
605 node = rb_next(node);
606 goto next_node;
607 }
608skip_stage:
609 if (stage < 1) {
610 stage++;
611 iter = 0;
612 goto next_stage;
613 }
614}
615static void lookup_victim_by_age(struct f2fs_sb_info *sbi,
616 struct victim_sel_policy *p)
617{
618 f2fs_bug_on(sbi, !f2fs_check_rb_tree_consistence(sbi,
619 &sbi->am.root, true));
620
621 if (p->gc_mode == GC_AT)
622 atgc_lookup_victim(sbi, p);
623 else if (p->alloc_mode == AT_SSR)
624 atssr_lookup_victim(sbi, p);
625 else
626 f2fs_bug_on(sbi, 1);
627}
628
629static void release_victim_entry(struct f2fs_sb_info *sbi)
630{
631 struct atgc_management *am = &sbi->am;
632 struct victim_entry *ve, *tmp;
633
634 list_for_each_entry_safe(ve, tmp, &am->victim_list, list) {
635 list_del(&ve->list);
636 kmem_cache_free(victim_entry_slab, ve);
637 am->victim_count--;
638 }
639
640 am->root = RB_ROOT_CACHED;
641
642 f2fs_bug_on(sbi, am->victim_count);
643 f2fs_bug_on(sbi, !list_empty(&am->victim_list));
644}
645
646
647
648
649
650
651
652
653
654static int get_victim_by_default(struct f2fs_sb_info *sbi,
655 unsigned int *result, int gc_type, int type,
656 char alloc_mode, unsigned long long age)
657{
658 struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
659 struct sit_info *sm = SIT_I(sbi);
660 struct victim_sel_policy p;
661 unsigned int secno, last_victim;
662 unsigned int last_segment;
663 unsigned int nsearched;
664 bool is_atgc;
665 int ret = 0;
666
667 mutex_lock(&dirty_i->seglist_lock);
668 last_segment = MAIN_SECS(sbi) * sbi->segs_per_sec;
669
670 p.alloc_mode = alloc_mode;
671 p.age = age;
672 p.age_threshold = sbi->am.age_threshold;
673
674retry:
675 select_policy(sbi, gc_type, type, &p);
676 p.min_segno = NULL_SEGNO;
677 p.oldest_age = 0;
678 p.min_cost = get_max_cost(sbi, &p);
679
680 is_atgc = (p.gc_mode == GC_AT || p.alloc_mode == AT_SSR);
681 nsearched = 0;
682
683 if (is_atgc)
684 SIT_I(sbi)->dirty_min_mtime = ULLONG_MAX;
685
686 if (*result != NULL_SEGNO) {
687 if (!get_valid_blocks(sbi, *result, false)) {
688 ret = -ENODATA;
689 goto out;
690 }
691
692 if (sec_usage_check(sbi, GET_SEC_FROM_SEG(sbi, *result)))
693 ret = -EBUSY;
694 else
695 p.min_segno = *result;
696 goto out;
697 }
698
699 ret = -ENODATA;
700 if (p.max_search == 0)
701 goto out;
702
703 if (__is_large_section(sbi) && p.alloc_mode == LFS) {
704 if (sbi->next_victim_seg[BG_GC] != NULL_SEGNO) {
705 p.min_segno = sbi->next_victim_seg[BG_GC];
706 *result = p.min_segno;
707 sbi->next_victim_seg[BG_GC] = NULL_SEGNO;
708 goto got_result;
709 }
710 if (gc_type == FG_GC &&
711 sbi->next_victim_seg[FG_GC] != NULL_SEGNO) {
712 p.min_segno = sbi->next_victim_seg[FG_GC];
713 *result = p.min_segno;
714 sbi->next_victim_seg[FG_GC] = NULL_SEGNO;
715 goto got_result;
716 }
717 }
718
719 last_victim = sm->last_victim[p.gc_mode];
720 if (p.alloc_mode == LFS && gc_type == FG_GC) {
721 p.min_segno = check_bg_victims(sbi);
722 if (p.min_segno != NULL_SEGNO)
723 goto got_it;
724 }
725
726 while (1) {
727 unsigned long cost, *dirty_bitmap;
728 unsigned int unit_no, segno;
729
730 dirty_bitmap = p.dirty_bitmap;
731 unit_no = find_next_bit(dirty_bitmap,
732 last_segment / p.ofs_unit,
733 p.offset / p.ofs_unit);
734 segno = unit_no * p.ofs_unit;
735 if (segno >= last_segment) {
736 if (sm->last_victim[p.gc_mode]) {
737 last_segment =
738 sm->last_victim[p.gc_mode];
739 sm->last_victim[p.gc_mode] = 0;
740 p.offset = 0;
741 continue;
742 }
743 break;
744 }
745
746 p.offset = segno + p.ofs_unit;
747 nsearched++;
748
749#ifdef CONFIG_F2FS_CHECK_FS
750
751
752
753
754
755 if (test_bit(segno, sm->invalid_segmap))
756 goto next;
757#endif
758
759 secno = GET_SEC_FROM_SEG(sbi, segno);
760
761 if (sec_usage_check(sbi, secno))
762 goto next;
763
764
765 if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED))) {
766 if (p.alloc_mode == LFS) {
767
768
769
770
771 if (get_ckpt_valid_blocks(sbi, segno, true))
772 goto next;
773 } else {
774
775
776
777
778
779 if (!f2fs_segment_has_free_slot(sbi, segno))
780 goto next;
781 }
782 }
783
784 if (gc_type == BG_GC && test_bit(secno, dirty_i->victim_secmap))
785 goto next;
786
787 if (is_atgc) {
788 add_victim_entry(sbi, &p, segno);
789 goto next;
790 }
791
792 cost = get_gc_cost(sbi, segno, &p);
793
794 if (p.min_cost > cost) {
795 p.min_segno = segno;
796 p.min_cost = cost;
797 }
798next:
799 if (nsearched >= p.max_search) {
800 if (!sm->last_victim[p.gc_mode] && segno <= last_victim)
801 sm->last_victim[p.gc_mode] =
802 last_victim + p.ofs_unit;
803 else
804 sm->last_victim[p.gc_mode] = segno + p.ofs_unit;
805 sm->last_victim[p.gc_mode] %=
806 (MAIN_SECS(sbi) * sbi->segs_per_sec);
807 break;
808 }
809 }
810
811
812 if (is_atgc) {
813 lookup_victim_by_age(sbi, &p);
814 release_victim_entry(sbi);
815 }
816
817 if (is_atgc && p.min_segno == NULL_SEGNO &&
818 sm->elapsed_time < p.age_threshold) {
819 p.age_threshold = 0;
820 goto retry;
821 }
822
823 if (p.min_segno != NULL_SEGNO) {
824got_it:
825 *result = (p.min_segno / p.ofs_unit) * p.ofs_unit;
826got_result:
827 if (p.alloc_mode == LFS) {
828 secno = GET_SEC_FROM_SEG(sbi, p.min_segno);
829 if (gc_type == FG_GC)
830 sbi->cur_victim_sec = secno;
831 else
832 set_bit(secno, dirty_i->victim_secmap);
833 }
834 ret = 0;
835
836 }
837out:
838 if (p.min_segno != NULL_SEGNO)
839 trace_f2fs_get_victim(sbi->sb, type, gc_type, &p,
840 sbi->cur_victim_sec,
841 prefree_segments(sbi), free_segments(sbi));
842 mutex_unlock(&dirty_i->seglist_lock);
843
844 return ret;
845}
846
847static const struct victim_selection default_v_ops = {
848 .get_victim = get_victim_by_default,
849};
850
851static struct inode *find_gc_inode(struct gc_inode_list *gc_list, nid_t ino)
852{
853 struct inode_entry *ie;
854
855 ie = radix_tree_lookup(&gc_list->iroot, ino);
856 if (ie)
857 return ie->inode;
858 return NULL;
859}
860
861static void add_gc_inode(struct gc_inode_list *gc_list, struct inode *inode)
862{
863 struct inode_entry *new_ie;
864
865 if (inode == find_gc_inode(gc_list, inode->i_ino)) {
866 iput(inode);
867 return;
868 }
869 new_ie = f2fs_kmem_cache_alloc(f2fs_inode_entry_slab,
870 GFP_NOFS, true, NULL);
871 new_ie->inode = inode;
872
873 f2fs_radix_tree_insert(&gc_list->iroot, inode->i_ino, new_ie);
874 list_add_tail(&new_ie->list, &gc_list->ilist);
875}
876
877static void put_gc_inode(struct gc_inode_list *gc_list)
878{
879 struct inode_entry *ie, *next_ie;
880
881 list_for_each_entry_safe(ie, next_ie, &gc_list->ilist, list) {
882 radix_tree_delete(&gc_list->iroot, ie->inode->i_ino);
883 iput(ie->inode);
884 list_del(&ie->list);
885 kmem_cache_free(f2fs_inode_entry_slab, ie);
886 }
887}
888
889static int check_valid_map(struct f2fs_sb_info *sbi,
890 unsigned int segno, int offset)
891{
892 struct sit_info *sit_i = SIT_I(sbi);
893 struct seg_entry *sentry;
894 int ret;
895
896 down_read(&sit_i->sentry_lock);
897 sentry = get_seg_entry(sbi, segno);
898 ret = f2fs_test_bit(offset, sentry->cur_valid_map);
899 up_read(&sit_i->sentry_lock);
900 return ret;
901}
902
903
904
905
906
907
908static int gc_node_segment(struct f2fs_sb_info *sbi,
909 struct f2fs_summary *sum, unsigned int segno, int gc_type)
910{
911 struct f2fs_summary *entry;
912 block_t start_addr;
913 int off;
914 int phase = 0;
915 bool fggc = (gc_type == FG_GC);
916 int submitted = 0;
917 unsigned int usable_blks_in_seg = f2fs_usable_blks_in_seg(sbi, segno);
918
919 start_addr = START_BLOCK(sbi, segno);
920
921next_step:
922 entry = sum;
923
924 if (fggc && phase == 2)
925 atomic_inc(&sbi->wb_sync_req[NODE]);
926
927 for (off = 0; off < usable_blks_in_seg; off++, entry++) {
928 nid_t nid = le32_to_cpu(entry->nid);
929 struct page *node_page;
930 struct node_info ni;
931 int err;
932
933
934 if (gc_type == BG_GC && has_not_enough_free_secs(sbi, 0, 0))
935 return submitted;
936
937 if (check_valid_map(sbi, segno, off) == 0)
938 continue;
939
940 if (phase == 0) {
941 f2fs_ra_meta_pages(sbi, NAT_BLOCK_OFFSET(nid), 1,
942 META_NAT, true);
943 continue;
944 }
945
946 if (phase == 1) {
947 f2fs_ra_node_page(sbi, nid);
948 continue;
949 }
950
951
952 node_page = f2fs_get_node_page(sbi, nid);
953 if (IS_ERR(node_page))
954 continue;
955
956
957 if (check_valid_map(sbi, segno, off) == 0) {
958 f2fs_put_page(node_page, 1);
959 continue;
960 }
961
962 if (f2fs_get_node_info(sbi, nid, &ni, false)) {
963 f2fs_put_page(node_page, 1);
964 continue;
965 }
966
967 if (ni.blk_addr != start_addr + off) {
968 f2fs_put_page(node_page, 1);
969 continue;
970 }
971
972 err = f2fs_move_node_page(node_page, gc_type);
973 if (!err && gc_type == FG_GC)
974 submitted++;
975 stat_inc_node_blk_count(sbi, 1, gc_type);
976 }
977
978 if (++phase < 3)
979 goto next_step;
980
981 if (fggc)
982 atomic_dec(&sbi->wb_sync_req[NODE]);
983 return submitted;
984}
985
986
987
988
989
990
991
992
993block_t f2fs_start_bidx_of_node(unsigned int node_ofs, struct inode *inode)
994{
995 unsigned int indirect_blks = 2 * NIDS_PER_BLOCK + 4;
996 unsigned int bidx;
997
998 if (node_ofs == 0)
999 return 0;
1000
1001 if (node_ofs <= 2) {
1002 bidx = node_ofs - 1;
1003 } else if (node_ofs <= indirect_blks) {
1004 int dec = (node_ofs - 4) / (NIDS_PER_BLOCK + 1);
1005
1006 bidx = node_ofs - 2 - dec;
1007 } else {
1008 int dec = (node_ofs - indirect_blks - 3) / (NIDS_PER_BLOCK + 1);
1009
1010 bidx = node_ofs - 5 - dec;
1011 }
1012 return bidx * ADDRS_PER_BLOCK(inode) + ADDRS_PER_INODE(inode);
1013}
1014
1015static bool is_alive(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
1016 struct node_info *dni, block_t blkaddr, unsigned int *nofs)
1017{
1018 struct page *node_page;
1019 nid_t nid;
1020 unsigned int ofs_in_node;
1021 block_t source_blkaddr;
1022
1023 nid = le32_to_cpu(sum->nid);
1024 ofs_in_node = le16_to_cpu(sum->ofs_in_node);
1025
1026 node_page = f2fs_get_node_page(sbi, nid);
1027 if (IS_ERR(node_page))
1028 return false;
1029
1030 if (f2fs_get_node_info(sbi, nid, dni, false)) {
1031 f2fs_put_page(node_page, 1);
1032 return false;
1033 }
1034
1035 if (sum->version != dni->version) {
1036 f2fs_warn(sbi, "%s: valid data with mismatched node version.",
1037 __func__);
1038 set_sbi_flag(sbi, SBI_NEED_FSCK);
1039 }
1040
1041 if (f2fs_check_nid_range(sbi, dni->ino))
1042 return false;
1043
1044 *nofs = ofs_of_node(node_page);
1045 source_blkaddr = data_blkaddr(NULL, node_page, ofs_in_node);
1046 f2fs_put_page(node_page, 1);
1047
1048 if (source_blkaddr != blkaddr) {
1049#ifdef CONFIG_F2FS_CHECK_FS
1050 unsigned int segno = GET_SEGNO(sbi, blkaddr);
1051 unsigned long offset = GET_BLKOFF_FROM_SEG0(sbi, blkaddr);
1052
1053 if (unlikely(check_valid_map(sbi, segno, offset))) {
1054 if (!test_and_set_bit(segno, SIT_I(sbi)->invalid_segmap)) {
1055 f2fs_err(sbi, "mismatched blkaddr %u (source_blkaddr %u) in seg %u",
1056 blkaddr, source_blkaddr, segno);
1057 set_sbi_flag(sbi, SBI_NEED_FSCK);
1058 }
1059 }
1060#endif
1061 return false;
1062 }
1063 return true;
1064}
1065
1066static int ra_data_block(struct inode *inode, pgoff_t index)
1067{
1068 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1069 struct address_space *mapping = inode->i_mapping;
1070 struct dnode_of_data dn;
1071 struct page *page;
1072 struct extent_info ei = {0, 0, 0};
1073 struct f2fs_io_info fio = {
1074 .sbi = sbi,
1075 .ino = inode->i_ino,
1076 .type = DATA,
1077 .temp = COLD,
1078 .op = REQ_OP_READ,
1079 .op_flags = 0,
1080 .encrypted_page = NULL,
1081 .in_list = false,
1082 .retry = false,
1083 };
1084 int err;
1085
1086 page = f2fs_grab_cache_page(mapping, index, true);
1087 if (!page)
1088 return -ENOMEM;
1089
1090 if (f2fs_lookup_extent_cache(inode, index, &ei)) {
1091 dn.data_blkaddr = ei.blk + index - ei.fofs;
1092 if (unlikely(!f2fs_is_valid_blkaddr(sbi, dn.data_blkaddr,
1093 DATA_GENERIC_ENHANCE_READ))) {
1094 err = -EFSCORRUPTED;
1095 goto put_page;
1096 }
1097 goto got_it;
1098 }
1099
1100 set_new_dnode(&dn, inode, NULL, NULL, 0);
1101 err = f2fs_get_dnode_of_data(&dn, index, LOOKUP_NODE);
1102 if (err)
1103 goto put_page;
1104 f2fs_put_dnode(&dn);
1105
1106 if (!__is_valid_data_blkaddr(dn.data_blkaddr)) {
1107 err = -ENOENT;
1108 goto put_page;
1109 }
1110 if (unlikely(!f2fs_is_valid_blkaddr(sbi, dn.data_blkaddr,
1111 DATA_GENERIC_ENHANCE))) {
1112 err = -EFSCORRUPTED;
1113 goto put_page;
1114 }
1115got_it:
1116
1117 fio.page = page;
1118 fio.new_blkaddr = fio.old_blkaddr = dn.data_blkaddr;
1119
1120
1121
1122
1123
1124 f2fs_wait_on_page_writeback(page, DATA, true, true);
1125
1126 f2fs_wait_on_block_writeback(inode, dn.data_blkaddr);
1127
1128 fio.encrypted_page = f2fs_pagecache_get_page(META_MAPPING(sbi),
1129 dn.data_blkaddr,
1130 FGP_LOCK | FGP_CREAT, GFP_NOFS);
1131 if (!fio.encrypted_page) {
1132 err = -ENOMEM;
1133 goto put_page;
1134 }
1135
1136 err = f2fs_submit_page_bio(&fio);
1137 if (err)
1138 goto put_encrypted_page;
1139 f2fs_put_page(fio.encrypted_page, 0);
1140 f2fs_put_page(page, 1);
1141
1142 f2fs_update_iostat(sbi, FS_DATA_READ_IO, F2FS_BLKSIZE);
1143 f2fs_update_iostat(sbi, FS_GDATA_READ_IO, F2FS_BLKSIZE);
1144
1145 return 0;
1146put_encrypted_page:
1147 f2fs_put_page(fio.encrypted_page, 1);
1148put_page:
1149 f2fs_put_page(page, 1);
1150 return err;
1151}
1152
1153
1154
1155
1156
1157static int move_data_block(struct inode *inode, block_t bidx,
1158 int gc_type, unsigned int segno, int off)
1159{
1160 struct f2fs_io_info fio = {
1161 .sbi = F2FS_I_SB(inode),
1162 .ino = inode->i_ino,
1163 .type = DATA,
1164 .temp = COLD,
1165 .op = REQ_OP_READ,
1166 .op_flags = 0,
1167 .encrypted_page = NULL,
1168 .in_list = false,
1169 .retry = false,
1170 };
1171 struct dnode_of_data dn;
1172 struct f2fs_summary sum;
1173 struct node_info ni;
1174 struct page *page, *mpage;
1175 block_t newaddr;
1176 int err = 0;
1177 bool lfs_mode = f2fs_lfs_mode(fio.sbi);
1178 int type = fio.sbi->am.atgc_enabled && (gc_type == BG_GC) &&
1179 (fio.sbi->gc_mode != GC_URGENT_HIGH) ?
1180 CURSEG_ALL_DATA_ATGC : CURSEG_COLD_DATA;
1181
1182
1183 page = f2fs_grab_cache_page(inode->i_mapping, bidx, false);
1184 if (!page)
1185 return -ENOMEM;
1186
1187 if (!check_valid_map(F2FS_I_SB(inode), segno, off)) {
1188 err = -ENOENT;
1189 goto out;
1190 }
1191
1192 if (f2fs_is_atomic_file(inode)) {
1193 F2FS_I(inode)->i_gc_failures[GC_FAILURE_ATOMIC]++;
1194 F2FS_I_SB(inode)->skipped_atomic_files[gc_type]++;
1195 err = -EAGAIN;
1196 goto out;
1197 }
1198
1199 if (f2fs_is_pinned_file(inode)) {
1200 f2fs_pin_file_control(inode, true);
1201 err = -EAGAIN;
1202 goto out;
1203 }
1204
1205 set_new_dnode(&dn, inode, NULL, NULL, 0);
1206 err = f2fs_get_dnode_of_data(&dn, bidx, LOOKUP_NODE);
1207 if (err)
1208 goto out;
1209
1210 if (unlikely(dn.data_blkaddr == NULL_ADDR)) {
1211 ClearPageUptodate(page);
1212 err = -ENOENT;
1213 goto put_out;
1214 }
1215
1216
1217
1218
1219
1220 f2fs_wait_on_page_writeback(page, DATA, true, true);
1221
1222 f2fs_wait_on_block_writeback(inode, dn.data_blkaddr);
1223
1224 err = f2fs_get_node_info(fio.sbi, dn.nid, &ni, false);
1225 if (err)
1226 goto put_out;
1227
1228
1229 fio.page = page;
1230 fio.new_blkaddr = fio.old_blkaddr = dn.data_blkaddr;
1231
1232 if (lfs_mode)
1233 down_write(&fio.sbi->io_order_lock);
1234
1235 mpage = f2fs_grab_cache_page(META_MAPPING(fio.sbi),
1236 fio.old_blkaddr, false);
1237 if (!mpage) {
1238 err = -ENOMEM;
1239 goto up_out;
1240 }
1241
1242 fio.encrypted_page = mpage;
1243
1244
1245 if (!PageUptodate(mpage)) {
1246 err = f2fs_submit_page_bio(&fio);
1247 if (err) {
1248 f2fs_put_page(mpage, 1);
1249 goto up_out;
1250 }
1251
1252 f2fs_update_iostat(fio.sbi, FS_DATA_READ_IO, F2FS_BLKSIZE);
1253 f2fs_update_iostat(fio.sbi, FS_GDATA_READ_IO, F2FS_BLKSIZE);
1254
1255 lock_page(mpage);
1256 if (unlikely(mpage->mapping != META_MAPPING(fio.sbi) ||
1257 !PageUptodate(mpage))) {
1258 err = -EIO;
1259 f2fs_put_page(mpage, 1);
1260 goto up_out;
1261 }
1262 }
1263
1264 set_summary(&sum, dn.nid, dn.ofs_in_node, ni.version);
1265
1266
1267 f2fs_allocate_data_block(fio.sbi, NULL, fio.old_blkaddr, &newaddr,
1268 &sum, type, NULL);
1269
1270 fio.encrypted_page = f2fs_pagecache_get_page(META_MAPPING(fio.sbi),
1271 newaddr, FGP_LOCK | FGP_CREAT, GFP_NOFS);
1272 if (!fio.encrypted_page) {
1273 err = -ENOMEM;
1274 f2fs_put_page(mpage, 1);
1275 goto recover_block;
1276 }
1277
1278
1279 f2fs_wait_on_page_writeback(fio.encrypted_page, DATA, true, true);
1280 memcpy(page_address(fio.encrypted_page),
1281 page_address(mpage), PAGE_SIZE);
1282 f2fs_put_page(mpage, 1);
1283 invalidate_mapping_pages(META_MAPPING(fio.sbi),
1284 fio.old_blkaddr, fio.old_blkaddr);
1285 f2fs_invalidate_compress_page(fio.sbi, fio.old_blkaddr);
1286
1287 set_page_dirty(fio.encrypted_page);
1288 if (clear_page_dirty_for_io(fio.encrypted_page))
1289 dec_page_count(fio.sbi, F2FS_DIRTY_META);
1290
1291 set_page_writeback(fio.encrypted_page);
1292 ClearPageError(page);
1293
1294 fio.op = REQ_OP_WRITE;
1295 fio.op_flags = REQ_SYNC;
1296 fio.new_blkaddr = newaddr;
1297 f2fs_submit_page_write(&fio);
1298 if (fio.retry) {
1299 err = -EAGAIN;
1300 if (PageWriteback(fio.encrypted_page))
1301 end_page_writeback(fio.encrypted_page);
1302 goto put_page_out;
1303 }
1304
1305 f2fs_update_iostat(fio.sbi, FS_GC_DATA_IO, F2FS_BLKSIZE);
1306
1307 f2fs_update_data_blkaddr(&dn, newaddr);
1308 set_inode_flag(inode, FI_APPEND_WRITE);
1309 if (page->index == 0)
1310 set_inode_flag(inode, FI_FIRST_BLOCK_WRITTEN);
1311put_page_out:
1312 f2fs_put_page(fio.encrypted_page, 1);
1313recover_block:
1314 if (err)
1315 f2fs_do_replace_block(fio.sbi, &sum, newaddr, fio.old_blkaddr,
1316 true, true, true);
1317up_out:
1318 if (lfs_mode)
1319 up_write(&fio.sbi->io_order_lock);
1320put_out:
1321 f2fs_put_dnode(&dn);
1322out:
1323 f2fs_put_page(page, 1);
1324 return err;
1325}
1326
1327static int move_data_page(struct inode *inode, block_t bidx, int gc_type,
1328 unsigned int segno, int off)
1329{
1330 struct page *page;
1331 int err = 0;
1332
1333 page = f2fs_get_lock_data_page(inode, bidx, true);
1334 if (IS_ERR(page))
1335 return PTR_ERR(page);
1336
1337 if (!check_valid_map(F2FS_I_SB(inode), segno, off)) {
1338 err = -ENOENT;
1339 goto out;
1340 }
1341
1342 if (f2fs_is_atomic_file(inode)) {
1343 F2FS_I(inode)->i_gc_failures[GC_FAILURE_ATOMIC]++;
1344 F2FS_I_SB(inode)->skipped_atomic_files[gc_type]++;
1345 err = -EAGAIN;
1346 goto out;
1347 }
1348 if (f2fs_is_pinned_file(inode)) {
1349 if (gc_type == FG_GC)
1350 f2fs_pin_file_control(inode, true);
1351 err = -EAGAIN;
1352 goto out;
1353 }
1354
1355 if (gc_type == BG_GC) {
1356 if (PageWriteback(page)) {
1357 err = -EAGAIN;
1358 goto out;
1359 }
1360 set_page_dirty(page);
1361 set_page_private_gcing(page);
1362 } else {
1363 struct f2fs_io_info fio = {
1364 .sbi = F2FS_I_SB(inode),
1365 .ino = inode->i_ino,
1366 .type = DATA,
1367 .temp = COLD,
1368 .op = REQ_OP_WRITE,
1369 .op_flags = REQ_SYNC,
1370 .old_blkaddr = NULL_ADDR,
1371 .page = page,
1372 .encrypted_page = NULL,
1373 .need_lock = LOCK_REQ,
1374 .io_type = FS_GC_DATA_IO,
1375 };
1376 bool is_dirty = PageDirty(page);
1377
1378retry:
1379 f2fs_wait_on_page_writeback(page, DATA, true, true);
1380
1381 set_page_dirty(page);
1382 if (clear_page_dirty_for_io(page)) {
1383 inode_dec_dirty_pages(inode);
1384 f2fs_remove_dirty_inode(inode);
1385 }
1386
1387 set_page_private_gcing(page);
1388
1389 err = f2fs_do_write_data_page(&fio);
1390 if (err) {
1391 clear_page_private_gcing(page);
1392 if (err == -ENOMEM) {
1393 memalloc_retry_wait(GFP_NOFS);
1394 goto retry;
1395 }
1396 if (is_dirty)
1397 set_page_dirty(page);
1398 }
1399 }
1400out:
1401 f2fs_put_page(page, 1);
1402 return err;
1403}
1404
1405
1406
1407
1408
1409
1410
1411
1412static int gc_data_segment(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
1413 struct gc_inode_list *gc_list, unsigned int segno, int gc_type,
1414 bool force_migrate)
1415{
1416 struct super_block *sb = sbi->sb;
1417 struct f2fs_summary *entry;
1418 block_t start_addr;
1419 int off;
1420 int phase = 0;
1421 int submitted = 0;
1422 unsigned int usable_blks_in_seg = f2fs_usable_blks_in_seg(sbi, segno);
1423
1424 start_addr = START_BLOCK(sbi, segno);
1425
1426next_step:
1427 entry = sum;
1428
1429 for (off = 0; off < usable_blks_in_seg; off++, entry++) {
1430 struct page *data_page;
1431 struct inode *inode;
1432 struct node_info dni;
1433 unsigned int ofs_in_node, nofs;
1434 block_t start_bidx;
1435 nid_t nid = le32_to_cpu(entry->nid);
1436
1437
1438
1439
1440
1441
1442 if ((gc_type == BG_GC && has_not_enough_free_secs(sbi, 0, 0)) ||
1443 (!force_migrate && get_valid_blocks(sbi, segno, true) ==
1444 BLKS_PER_SEC(sbi)))
1445 return submitted;
1446
1447 if (check_valid_map(sbi, segno, off) == 0)
1448 continue;
1449
1450 if (phase == 0) {
1451 f2fs_ra_meta_pages(sbi, NAT_BLOCK_OFFSET(nid), 1,
1452 META_NAT, true);
1453 continue;
1454 }
1455
1456 if (phase == 1) {
1457 f2fs_ra_node_page(sbi, nid);
1458 continue;
1459 }
1460
1461
1462 if (!is_alive(sbi, entry, &dni, start_addr + off, &nofs))
1463 continue;
1464
1465 if (phase == 2) {
1466 f2fs_ra_node_page(sbi, dni.ino);
1467 continue;
1468 }
1469
1470 ofs_in_node = le16_to_cpu(entry->ofs_in_node);
1471
1472 if (phase == 3) {
1473 inode = f2fs_iget(sb, dni.ino);
1474 if (IS_ERR(inode) || is_bad_inode(inode) ||
1475 special_file(inode->i_mode))
1476 continue;
1477
1478 if (!down_write_trylock(
1479 &F2FS_I(inode)->i_gc_rwsem[WRITE])) {
1480 iput(inode);
1481 sbi->skipped_gc_rwsem++;
1482 continue;
1483 }
1484
1485 start_bidx = f2fs_start_bidx_of_node(nofs, inode) +
1486 ofs_in_node;
1487
1488 if (f2fs_post_read_required(inode)) {
1489 int err = ra_data_block(inode, start_bidx);
1490
1491 up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
1492 if (err) {
1493 iput(inode);
1494 continue;
1495 }
1496 add_gc_inode(gc_list, inode);
1497 continue;
1498 }
1499
1500 data_page = f2fs_get_read_data_page(inode,
1501 start_bidx, REQ_RAHEAD, true);
1502 up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
1503 if (IS_ERR(data_page)) {
1504 iput(inode);
1505 continue;
1506 }
1507
1508 f2fs_put_page(data_page, 0);
1509 add_gc_inode(gc_list, inode);
1510 continue;
1511 }
1512
1513
1514 inode = find_gc_inode(gc_list, dni.ino);
1515 if (inode) {
1516 struct f2fs_inode_info *fi = F2FS_I(inode);
1517 bool locked = false;
1518 int err;
1519
1520 if (S_ISREG(inode->i_mode)) {
1521 if (!down_write_trylock(&fi->i_gc_rwsem[READ])) {
1522 sbi->skipped_gc_rwsem++;
1523 continue;
1524 }
1525 if (!down_write_trylock(
1526 &fi->i_gc_rwsem[WRITE])) {
1527 sbi->skipped_gc_rwsem++;
1528 up_write(&fi->i_gc_rwsem[READ]);
1529 continue;
1530 }
1531 locked = true;
1532
1533
1534 inode_dio_wait(inode);
1535 }
1536
1537 start_bidx = f2fs_start_bidx_of_node(nofs, inode)
1538 + ofs_in_node;
1539 if (f2fs_post_read_required(inode))
1540 err = move_data_block(inode, start_bidx,
1541 gc_type, segno, off);
1542 else
1543 err = move_data_page(inode, start_bidx, gc_type,
1544 segno, off);
1545
1546 if (!err && (gc_type == FG_GC ||
1547 f2fs_post_read_required(inode)))
1548 submitted++;
1549
1550 if (locked) {
1551 up_write(&fi->i_gc_rwsem[WRITE]);
1552 up_write(&fi->i_gc_rwsem[READ]);
1553 }
1554
1555 stat_inc_data_blk_count(sbi, 1, gc_type);
1556 }
1557 }
1558
1559 if (++phase < 5)
1560 goto next_step;
1561
1562 return submitted;
1563}
1564
1565static int __get_victim(struct f2fs_sb_info *sbi, unsigned int *victim,
1566 int gc_type)
1567{
1568 struct sit_info *sit_i = SIT_I(sbi);
1569 int ret;
1570
1571 down_write(&sit_i->sentry_lock);
1572 ret = DIRTY_I(sbi)->v_ops->get_victim(sbi, victim, gc_type,
1573 NO_CHECK_TYPE, LFS, 0);
1574 up_write(&sit_i->sentry_lock);
1575 return ret;
1576}
1577
1578static int do_garbage_collect(struct f2fs_sb_info *sbi,
1579 unsigned int start_segno,
1580 struct gc_inode_list *gc_list, int gc_type,
1581 bool force_migrate)
1582{
1583 struct page *sum_page;
1584 struct f2fs_summary_block *sum;
1585 struct blk_plug plug;
1586 unsigned int segno = start_segno;
1587 unsigned int end_segno = start_segno + sbi->segs_per_sec;
1588 int seg_freed = 0, migrated = 0;
1589 unsigned char type = IS_DATASEG(get_seg_entry(sbi, segno)->type) ?
1590 SUM_TYPE_DATA : SUM_TYPE_NODE;
1591 int submitted = 0;
1592
1593 if (__is_large_section(sbi))
1594 end_segno = rounddown(end_segno, sbi->segs_per_sec);
1595
1596
1597
1598
1599
1600
1601 if (f2fs_sb_has_blkzoned(sbi))
1602 end_segno -= sbi->segs_per_sec -
1603 f2fs_usable_segs_in_sec(sbi, segno);
1604
1605 sanity_check_seg_type(sbi, get_seg_entry(sbi, segno)->type);
1606
1607
1608 if (__is_large_section(sbi))
1609 f2fs_ra_meta_pages(sbi, GET_SUM_BLOCK(sbi, segno),
1610 end_segno - segno, META_SSA, true);
1611
1612
1613 while (segno < end_segno) {
1614 sum_page = f2fs_get_sum_page(sbi, segno++);
1615 if (IS_ERR(sum_page)) {
1616 int err = PTR_ERR(sum_page);
1617
1618 end_segno = segno - 1;
1619 for (segno = start_segno; segno < end_segno; segno++) {
1620 sum_page = find_get_page(META_MAPPING(sbi),
1621 GET_SUM_BLOCK(sbi, segno));
1622 f2fs_put_page(sum_page, 0);
1623 f2fs_put_page(sum_page, 0);
1624 }
1625 return err;
1626 }
1627 unlock_page(sum_page);
1628 }
1629
1630 blk_start_plug(&plug);
1631
1632 for (segno = start_segno; segno < end_segno; segno++) {
1633
1634
1635 sum_page = find_get_page(META_MAPPING(sbi),
1636 GET_SUM_BLOCK(sbi, segno));
1637 f2fs_put_page(sum_page, 0);
1638
1639 if (get_valid_blocks(sbi, segno, false) == 0)
1640 goto freed;
1641 if (gc_type == BG_GC && __is_large_section(sbi) &&
1642 migrated >= sbi->migration_granularity)
1643 goto skip;
1644 if (!PageUptodate(sum_page) || unlikely(f2fs_cp_error(sbi)))
1645 goto skip;
1646
1647 sum = page_address(sum_page);
1648 if (type != GET_SUM_TYPE((&sum->footer))) {
1649 f2fs_err(sbi, "Inconsistent segment (%u) type [%d, %d] in SSA and SIT",
1650 segno, type, GET_SUM_TYPE((&sum->footer)));
1651 set_sbi_flag(sbi, SBI_NEED_FSCK);
1652 f2fs_stop_checkpoint(sbi, false);
1653 goto skip;
1654 }
1655
1656
1657
1658
1659
1660
1661
1662
1663 if (type == SUM_TYPE_NODE)
1664 submitted += gc_node_segment(sbi, sum->entries, segno,
1665 gc_type);
1666 else
1667 submitted += gc_data_segment(sbi, sum->entries, gc_list,
1668 segno, gc_type,
1669 force_migrate);
1670
1671 stat_inc_seg_count(sbi, type, gc_type);
1672 sbi->gc_reclaimed_segs[sbi->gc_mode]++;
1673 migrated++;
1674
1675freed:
1676 if (gc_type == FG_GC &&
1677 get_valid_blocks(sbi, segno, false) == 0)
1678 seg_freed++;
1679
1680 if (__is_large_section(sbi) && segno + 1 < end_segno)
1681 sbi->next_victim_seg[gc_type] = segno + 1;
1682skip:
1683 f2fs_put_page(sum_page, 0);
1684 }
1685
1686 if (submitted)
1687 f2fs_submit_merged_write(sbi,
1688 (type == SUM_TYPE_NODE) ? NODE : DATA);
1689
1690 blk_finish_plug(&plug);
1691
1692 stat_inc_call_count(sbi->stat_info);
1693
1694 return seg_freed;
1695}
1696
1697int f2fs_gc(struct f2fs_sb_info *sbi, bool sync,
1698 bool background, bool force, unsigned int segno)
1699{
1700 int gc_type = sync ? FG_GC : BG_GC;
1701 int sec_freed = 0, seg_freed = 0, total_freed = 0;
1702 int ret = 0;
1703 struct cp_control cpc;
1704 unsigned int init_segno = segno;
1705 struct gc_inode_list gc_list = {
1706 .ilist = LIST_HEAD_INIT(gc_list.ilist),
1707 .iroot = RADIX_TREE_INIT(gc_list.iroot, GFP_NOFS),
1708 };
1709 unsigned long long last_skipped = sbi->skipped_atomic_files[FG_GC];
1710 unsigned long long first_skipped;
1711 unsigned int skipped_round = 0, round = 0;
1712
1713 trace_f2fs_gc_begin(sbi->sb, sync, background,
1714 get_pages(sbi, F2FS_DIRTY_NODES),
1715 get_pages(sbi, F2FS_DIRTY_DENTS),
1716 get_pages(sbi, F2FS_DIRTY_IMETA),
1717 free_sections(sbi),
1718 free_segments(sbi),
1719 reserved_segments(sbi),
1720 prefree_segments(sbi));
1721
1722 cpc.reason = __get_cp_reason(sbi);
1723 sbi->skipped_gc_rwsem = 0;
1724 first_skipped = last_skipped;
1725gc_more:
1726 if (unlikely(!(sbi->sb->s_flags & SB_ACTIVE))) {
1727 ret = -EINVAL;
1728 goto stop;
1729 }
1730 if (unlikely(f2fs_cp_error(sbi))) {
1731 ret = -EIO;
1732 goto stop;
1733 }
1734
1735 if (gc_type == BG_GC && has_not_enough_free_secs(sbi, 0, 0)) {
1736
1737
1738
1739
1740
1741 if (prefree_segments(sbi) &&
1742 !is_sbi_flag_set(sbi, SBI_CP_DISABLED)) {
1743 ret = f2fs_write_checkpoint(sbi, &cpc);
1744 if (ret)
1745 goto stop;
1746 }
1747 if (has_not_enough_free_secs(sbi, 0, 0))
1748 gc_type = FG_GC;
1749 }
1750
1751
1752 if (gc_type == BG_GC && !background) {
1753 ret = -EINVAL;
1754 goto stop;
1755 }
1756 ret = __get_victim(sbi, &segno, gc_type);
1757 if (ret)
1758 goto stop;
1759
1760 seg_freed = do_garbage_collect(sbi, segno, &gc_list, gc_type, force);
1761 if (gc_type == FG_GC &&
1762 seg_freed == f2fs_usable_segs_in_sec(sbi, segno))
1763 sec_freed++;
1764 total_freed += seg_freed;
1765
1766 if (gc_type == FG_GC) {
1767 if (sbi->skipped_atomic_files[FG_GC] > last_skipped ||
1768 sbi->skipped_gc_rwsem)
1769 skipped_round++;
1770 last_skipped = sbi->skipped_atomic_files[FG_GC];
1771 round++;
1772 }
1773
1774 if (gc_type == FG_GC)
1775 sbi->cur_victim_sec = NULL_SEGNO;
1776
1777 if (sync)
1778 goto stop;
1779
1780 if (has_not_enough_free_secs(sbi, sec_freed, 0)) {
1781 if (skipped_round <= MAX_SKIP_GC_COUNT ||
1782 skipped_round * 2 < round) {
1783 segno = NULL_SEGNO;
1784 goto gc_more;
1785 }
1786
1787 if (first_skipped < last_skipped &&
1788 (last_skipped - first_skipped) >
1789 sbi->skipped_gc_rwsem) {
1790 f2fs_drop_inmem_pages_all(sbi, true);
1791 segno = NULL_SEGNO;
1792 goto gc_more;
1793 }
1794 if (gc_type == FG_GC && !is_sbi_flag_set(sbi, SBI_CP_DISABLED))
1795 ret = f2fs_write_checkpoint(sbi, &cpc);
1796 }
1797stop:
1798 SIT_I(sbi)->last_victim[ALLOC_NEXT] = 0;
1799 SIT_I(sbi)->last_victim[FLUSH_DEVICE] = init_segno;
1800
1801 trace_f2fs_gc_end(sbi->sb, ret, total_freed, sec_freed,
1802 get_pages(sbi, F2FS_DIRTY_NODES),
1803 get_pages(sbi, F2FS_DIRTY_DENTS),
1804 get_pages(sbi, F2FS_DIRTY_IMETA),
1805 free_sections(sbi),
1806 free_segments(sbi),
1807 reserved_segments(sbi),
1808 prefree_segments(sbi));
1809
1810 up_write(&sbi->gc_lock);
1811
1812 put_gc_inode(&gc_list);
1813
1814 if (sync && !ret)
1815 ret = sec_freed ? 0 : -EAGAIN;
1816 return ret;
1817}
1818
1819int __init f2fs_create_garbage_collection_cache(void)
1820{
1821 victim_entry_slab = f2fs_kmem_cache_create("f2fs_victim_entry",
1822 sizeof(struct victim_entry));
1823 if (!victim_entry_slab)
1824 return -ENOMEM;
1825 return 0;
1826}
1827
1828void f2fs_destroy_garbage_collection_cache(void)
1829{
1830 kmem_cache_destroy(victim_entry_slab);
1831}
1832
1833static void init_atgc_management(struct f2fs_sb_info *sbi)
1834{
1835 struct atgc_management *am = &sbi->am;
1836
1837 if (test_opt(sbi, ATGC) &&
1838 SIT_I(sbi)->elapsed_time >= DEF_GC_THREAD_AGE_THRESHOLD)
1839 am->atgc_enabled = true;
1840
1841 am->root = RB_ROOT_CACHED;
1842 INIT_LIST_HEAD(&am->victim_list);
1843 am->victim_count = 0;
1844
1845 am->candidate_ratio = DEF_GC_THREAD_CANDIDATE_RATIO;
1846 am->max_candidate_count = DEF_GC_THREAD_MAX_CANDIDATE_COUNT;
1847 am->age_weight = DEF_GC_THREAD_AGE_WEIGHT;
1848 am->age_threshold = DEF_GC_THREAD_AGE_THRESHOLD;
1849}
1850
1851void f2fs_build_gc_manager(struct f2fs_sb_info *sbi)
1852{
1853 DIRTY_I(sbi)->v_ops = &default_v_ops;
1854
1855 sbi->gc_pin_file_threshold = DEF_GC_FAILED_PINNED_FILES;
1856
1857
1858 if (f2fs_is_multi_device(sbi) && !__is_large_section(sbi))
1859 SIT_I(sbi)->last_victim[ALLOC_NEXT] =
1860 GET_SEGNO(sbi, FDEV(0).end_blk) + 1;
1861
1862 init_atgc_management(sbi);
1863}
1864
1865static int free_segment_range(struct f2fs_sb_info *sbi,
1866 unsigned int secs, bool gc_only)
1867{
1868 unsigned int segno, next_inuse, start, end;
1869 struct cp_control cpc = { CP_RESIZE, 0, 0, 0 };
1870 int gc_mode, gc_type;
1871 int err = 0;
1872 int type;
1873
1874
1875 MAIN_SECS(sbi) -= secs;
1876 start = MAIN_SECS(sbi) * sbi->segs_per_sec;
1877 end = MAIN_SEGS(sbi) - 1;
1878
1879 mutex_lock(&DIRTY_I(sbi)->seglist_lock);
1880 for (gc_mode = 0; gc_mode < MAX_GC_POLICY; gc_mode++)
1881 if (SIT_I(sbi)->last_victim[gc_mode] >= start)
1882 SIT_I(sbi)->last_victim[gc_mode] = 0;
1883
1884 for (gc_type = BG_GC; gc_type <= FG_GC; gc_type++)
1885 if (sbi->next_victim_seg[gc_type] >= start)
1886 sbi->next_victim_seg[gc_type] = NULL_SEGNO;
1887 mutex_unlock(&DIRTY_I(sbi)->seglist_lock);
1888
1889
1890 for (type = CURSEG_HOT_DATA; type < NR_CURSEG_PERSIST_TYPE; type++)
1891 f2fs_allocate_segment_for_resize(sbi, type, start, end);
1892
1893
1894 for (segno = start; segno <= end; segno += sbi->segs_per_sec) {
1895 struct gc_inode_list gc_list = {
1896 .ilist = LIST_HEAD_INIT(gc_list.ilist),
1897 .iroot = RADIX_TREE_INIT(gc_list.iroot, GFP_NOFS),
1898 };
1899
1900 do_garbage_collect(sbi, segno, &gc_list, FG_GC, true);
1901 put_gc_inode(&gc_list);
1902
1903 if (!gc_only && get_valid_blocks(sbi, segno, true)) {
1904 err = -EAGAIN;
1905 goto out;
1906 }
1907 if (fatal_signal_pending(current)) {
1908 err = -ERESTARTSYS;
1909 goto out;
1910 }
1911 }
1912 if (gc_only)
1913 goto out;
1914
1915 err = f2fs_write_checkpoint(sbi, &cpc);
1916 if (err)
1917 goto out;
1918
1919 next_inuse = find_next_inuse(FREE_I(sbi), end + 1, start);
1920 if (next_inuse <= end) {
1921 f2fs_err(sbi, "segno %u should be free but still inuse!",
1922 next_inuse);
1923 f2fs_bug_on(sbi, 1);
1924 }
1925out:
1926 MAIN_SECS(sbi) += secs;
1927 return err;
1928}
1929
1930static void update_sb_metadata(struct f2fs_sb_info *sbi, int secs)
1931{
1932 struct f2fs_super_block *raw_sb = F2FS_RAW_SUPER(sbi);
1933 int section_count;
1934 int segment_count;
1935 int segment_count_main;
1936 long long block_count;
1937 int segs = secs * sbi->segs_per_sec;
1938
1939 down_write(&sbi->sb_lock);
1940
1941 section_count = le32_to_cpu(raw_sb->section_count);
1942 segment_count = le32_to_cpu(raw_sb->segment_count);
1943 segment_count_main = le32_to_cpu(raw_sb->segment_count_main);
1944 block_count = le64_to_cpu(raw_sb->block_count);
1945
1946 raw_sb->section_count = cpu_to_le32(section_count + secs);
1947 raw_sb->segment_count = cpu_to_le32(segment_count + segs);
1948 raw_sb->segment_count_main = cpu_to_le32(segment_count_main + segs);
1949 raw_sb->block_count = cpu_to_le64(block_count +
1950 (long long)segs * sbi->blocks_per_seg);
1951 if (f2fs_is_multi_device(sbi)) {
1952 int last_dev = sbi->s_ndevs - 1;
1953 int dev_segs =
1954 le32_to_cpu(raw_sb->devs[last_dev].total_segments);
1955
1956 raw_sb->devs[last_dev].total_segments =
1957 cpu_to_le32(dev_segs + segs);
1958 }
1959
1960 up_write(&sbi->sb_lock);
1961}
1962
1963static void update_fs_metadata(struct f2fs_sb_info *sbi, int secs)
1964{
1965 int segs = secs * sbi->segs_per_sec;
1966 long long blks = (long long)segs * sbi->blocks_per_seg;
1967 long long user_block_count =
1968 le64_to_cpu(F2FS_CKPT(sbi)->user_block_count);
1969
1970 SM_I(sbi)->segment_count = (int)SM_I(sbi)->segment_count + segs;
1971 MAIN_SEGS(sbi) = (int)MAIN_SEGS(sbi) + segs;
1972 MAIN_SECS(sbi) += secs;
1973 FREE_I(sbi)->free_sections = (int)FREE_I(sbi)->free_sections + secs;
1974 FREE_I(sbi)->free_segments = (int)FREE_I(sbi)->free_segments + segs;
1975 F2FS_CKPT(sbi)->user_block_count = cpu_to_le64(user_block_count + blks);
1976
1977 if (f2fs_is_multi_device(sbi)) {
1978 int last_dev = sbi->s_ndevs - 1;
1979
1980 FDEV(last_dev).total_segments =
1981 (int)FDEV(last_dev).total_segments + segs;
1982 FDEV(last_dev).end_blk =
1983 (long long)FDEV(last_dev).end_blk + blks;
1984#ifdef CONFIG_BLK_DEV_ZONED
1985 FDEV(last_dev).nr_blkz = (int)FDEV(last_dev).nr_blkz +
1986 (int)(blks >> sbi->log_blocks_per_blkz);
1987#endif
1988 }
1989}
1990
1991int f2fs_resize_fs(struct f2fs_sb_info *sbi, __u64 block_count)
1992{
1993 __u64 old_block_count, shrunk_blocks;
1994 struct cp_control cpc = { CP_RESIZE, 0, 0, 0 };
1995 unsigned int secs;
1996 int err = 0;
1997 __u32 rem;
1998
1999 old_block_count = le64_to_cpu(F2FS_RAW_SUPER(sbi)->block_count);
2000 if (block_count > old_block_count)
2001 return -EINVAL;
2002
2003 if (f2fs_is_multi_device(sbi)) {
2004 int last_dev = sbi->s_ndevs - 1;
2005 __u64 last_segs = FDEV(last_dev).total_segments;
2006
2007 if (block_count + last_segs * sbi->blocks_per_seg <=
2008 old_block_count)
2009 return -EINVAL;
2010 }
2011
2012
2013 div_u64_rem(block_count, BLKS_PER_SEC(sbi), &rem);
2014 if (rem)
2015 return -EINVAL;
2016
2017 if (block_count == old_block_count)
2018 return 0;
2019
2020 if (is_sbi_flag_set(sbi, SBI_NEED_FSCK)) {
2021 f2fs_err(sbi, "Should run fsck to repair first.");
2022 return -EFSCORRUPTED;
2023 }
2024
2025 if (test_opt(sbi, DISABLE_CHECKPOINT)) {
2026 f2fs_err(sbi, "Checkpoint should be enabled.");
2027 return -EINVAL;
2028 }
2029
2030 shrunk_blocks = old_block_count - block_count;
2031 secs = div_u64(shrunk_blocks, BLKS_PER_SEC(sbi));
2032
2033
2034 if (!down_write_trylock(&sbi->gc_lock))
2035 return -EAGAIN;
2036
2037
2038 f2fs_lock_op(sbi);
2039
2040 spin_lock(&sbi->stat_lock);
2041 if (shrunk_blocks + valid_user_blocks(sbi) +
2042 sbi->current_reserved_blocks + sbi->unusable_block_count +
2043 F2FS_OPTION(sbi).root_reserved_blocks > sbi->user_block_count)
2044 err = -ENOSPC;
2045 spin_unlock(&sbi->stat_lock);
2046
2047 if (err)
2048 goto out_unlock;
2049
2050 err = free_segment_range(sbi, secs, true);
2051
2052out_unlock:
2053 f2fs_unlock_op(sbi);
2054 up_write(&sbi->gc_lock);
2055 if (err)
2056 return err;
2057
2058 set_sbi_flag(sbi, SBI_IS_RESIZEFS);
2059
2060 freeze_super(sbi->sb);
2061 down_write(&sbi->gc_lock);
2062 down_write(&sbi->cp_global_sem);
2063
2064 spin_lock(&sbi->stat_lock);
2065 if (shrunk_blocks + valid_user_blocks(sbi) +
2066 sbi->current_reserved_blocks + sbi->unusable_block_count +
2067 F2FS_OPTION(sbi).root_reserved_blocks > sbi->user_block_count)
2068 err = -ENOSPC;
2069 else
2070 sbi->user_block_count -= shrunk_blocks;
2071 spin_unlock(&sbi->stat_lock);
2072 if (err)
2073 goto out_err;
2074
2075 err = free_segment_range(sbi, secs, false);
2076 if (err)
2077 goto recover_out;
2078
2079 update_sb_metadata(sbi, -secs);
2080
2081 err = f2fs_commit_super(sbi, false);
2082 if (err) {
2083 update_sb_metadata(sbi, secs);
2084 goto recover_out;
2085 }
2086
2087 update_fs_metadata(sbi, -secs);
2088 clear_sbi_flag(sbi, SBI_IS_RESIZEFS);
2089 set_sbi_flag(sbi, SBI_IS_DIRTY);
2090
2091 err = f2fs_write_checkpoint(sbi, &cpc);
2092 if (err) {
2093 update_fs_metadata(sbi, secs);
2094 update_sb_metadata(sbi, secs);
2095 f2fs_commit_super(sbi, false);
2096 }
2097recover_out:
2098 if (err) {
2099 set_sbi_flag(sbi, SBI_NEED_FSCK);
2100 f2fs_err(sbi, "resize_fs failed, should run fsck to repair!");
2101
2102 spin_lock(&sbi->stat_lock);
2103 sbi->user_block_count += shrunk_blocks;
2104 spin_unlock(&sbi->stat_lock);
2105 }
2106out_err:
2107 up_write(&sbi->cp_global_sem);
2108 up_write(&sbi->gc_lock);
2109 thaw_super(sbi->sb);
2110 clear_sbi_flag(sbi, SBI_IS_RESIZEFS);
2111 return err;
2112}
2113
