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7
8#include <linux/fs.h>
9#include <linux/module.h>
10#include <linux/backing-dev.h>
11#include <linux/init.h>
12#include <linux/f2fs_fs.h>
13#include <linux/kthread.h>
14#include <linux/delay.h>
15#include <linux/freezer.h>
16#include <linux/sched/signal.h>
17
18#include "f2fs.h"
19#include "node.h"
20#include "segment.h"
21#include "gc.h"
22#include <trace/events/f2fs.h>
23
24static int gc_thread_func(void *data)
25{
26 struct f2fs_sb_info *sbi = data;
27 struct f2fs_gc_kthread *gc_th = sbi->gc_thread;
28 wait_queue_head_t *wq = &sbi->gc_thread->gc_wait_queue_head;
29 unsigned int wait_ms;
30
31 wait_ms = gc_th->min_sleep_time;
32
33 set_freezable();
34 do {
35 bool sync_mode;
36
37 wait_event_interruptible_timeout(*wq,
38 kthread_should_stop() || freezing(current) ||
39 gc_th->gc_wake,
40 msecs_to_jiffies(wait_ms));
41
42
43 if (gc_th->gc_wake)
44 gc_th->gc_wake = 0;
45
46 if (try_to_freeze()) {
47 stat_other_skip_bggc_count(sbi);
48 continue;
49 }
50 if (kthread_should_stop())
51 break;
52
53 if (sbi->sb->s_writers.frozen >= SB_FREEZE_WRITE) {
54 increase_sleep_time(gc_th, &wait_ms);
55 stat_other_skip_bggc_count(sbi);
56 continue;
57 }
58
59 if (time_to_inject(sbi, FAULT_CHECKPOINT)) {
60 f2fs_show_injection_info(sbi, FAULT_CHECKPOINT);
61 f2fs_stop_checkpoint(sbi, false);
62 }
63
64 if (!sb_start_write_trylock(sbi->sb)) {
65 stat_other_skip_bggc_count(sbi);
66 continue;
67 }
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82 if (sbi->gc_mode == GC_URGENT) {
83 wait_ms = gc_th->urgent_sleep_time;
84 down_write(&sbi->gc_lock);
85 goto do_gc;
86 }
87
88 if (!down_write_trylock(&sbi->gc_lock)) {
89 stat_other_skip_bggc_count(sbi);
90 goto next;
91 }
92
93 if (!is_idle(sbi, GC_TIME)) {
94 increase_sleep_time(gc_th, &wait_ms);
95 up_write(&sbi->gc_lock);
96 stat_io_skip_bggc_count(sbi);
97 goto next;
98 }
99
100 if (has_enough_invalid_blocks(sbi))
101 decrease_sleep_time(gc_th, &wait_ms);
102 else
103 increase_sleep_time(gc_th, &wait_ms);
104do_gc:
105 stat_inc_bggc_count(sbi->stat_info);
106
107 sync_mode = F2FS_OPTION(sbi).bggc_mode == BGGC_MODE_SYNC;
108
109
110 if (f2fs_gc(sbi, sync_mode, true, NULL_SEGNO))
111 wait_ms = gc_th->no_gc_sleep_time;
112
113 trace_f2fs_background_gc(sbi->sb, wait_ms,
114 prefree_segments(sbi), free_segments(sbi));
115
116
117 f2fs_balance_fs_bg(sbi, true);
118next:
119 sb_end_write(sbi->sb);
120
121 } while (!kthread_should_stop());
122 return 0;
123}
124
125int f2fs_start_gc_thread(struct f2fs_sb_info *sbi)
126{
127 struct f2fs_gc_kthread *gc_th;
128 dev_t dev = sbi->sb->s_bdev->bd_dev;
129 int err = 0;
130
131 gc_th = f2fs_kmalloc(sbi, sizeof(struct f2fs_gc_kthread), GFP_KERNEL);
132 if (!gc_th) {
133 err = -ENOMEM;
134 goto out;
135 }
136
137 gc_th->urgent_sleep_time = DEF_GC_THREAD_URGENT_SLEEP_TIME;
138 gc_th->min_sleep_time = DEF_GC_THREAD_MIN_SLEEP_TIME;
139 gc_th->max_sleep_time = DEF_GC_THREAD_MAX_SLEEP_TIME;
140 gc_th->no_gc_sleep_time = DEF_GC_THREAD_NOGC_SLEEP_TIME;
141
142 gc_th->gc_wake= 0;
143
144 sbi->gc_thread = gc_th;
145 init_waitqueue_head(&sbi->gc_thread->gc_wait_queue_head);
146 sbi->gc_thread->f2fs_gc_task = kthread_run(gc_thread_func, sbi,
147 "f2fs_gc-%u:%u", MAJOR(dev), MINOR(dev));
148 if (IS_ERR(gc_th->f2fs_gc_task)) {
149 err = PTR_ERR(gc_th->f2fs_gc_task);
150 kvfree(gc_th);
151 sbi->gc_thread = NULL;
152 }
153out:
154 return err;
155}
156
157void f2fs_stop_gc_thread(struct f2fs_sb_info *sbi)
158{
159 struct f2fs_gc_kthread *gc_th = sbi->gc_thread;
160 if (!gc_th)
161 return;
162 kthread_stop(gc_th->f2fs_gc_task);
163 kvfree(gc_th);
164 sbi->gc_thread = NULL;
165}
166
167static int select_gc_type(struct f2fs_sb_info *sbi, int gc_type)
168{
169 int gc_mode = (gc_type == BG_GC) ? GC_CB : GC_GREEDY;
170
171 switch (sbi->gc_mode) {
172 case GC_IDLE_CB:
173 gc_mode = GC_CB;
174 break;
175 case GC_IDLE_GREEDY:
176 case GC_URGENT:
177 gc_mode = GC_GREEDY;
178 break;
179 }
180 return gc_mode;
181}
182
183static void select_policy(struct f2fs_sb_info *sbi, int gc_type,
184 int type, struct victim_sel_policy *p)
185{
186 struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
187
188 if (p->alloc_mode == SSR) {
189 p->gc_mode = GC_GREEDY;
190 p->dirty_segmap = dirty_i->dirty_segmap[type];
191 p->max_search = dirty_i->nr_dirty[type];
192 p->ofs_unit = 1;
193 } else {
194 p->gc_mode = select_gc_type(sbi, gc_type);
195 p->dirty_segmap = dirty_i->dirty_segmap[DIRTY];
196 p->max_search = dirty_i->nr_dirty[DIRTY];
197 p->ofs_unit = sbi->segs_per_sec;
198 }
199
200
201
202
203
204 if (gc_type != FG_GC &&
205 (sbi->gc_mode != GC_URGENT) &&
206 p->max_search > sbi->max_victim_search)
207 p->max_search = sbi->max_victim_search;
208
209
210 if (test_opt(sbi, NOHEAP) &&
211 (type == CURSEG_HOT_DATA || IS_NODESEG(type)))
212 p->offset = 0;
213 else
214 p->offset = SIT_I(sbi)->last_victim[p->gc_mode];
215}
216
217static unsigned int get_max_cost(struct f2fs_sb_info *sbi,
218 struct victim_sel_policy *p)
219{
220
221 if (p->alloc_mode == SSR)
222 return sbi->blocks_per_seg;
223 if (p->gc_mode == GC_GREEDY)
224 return 2 * sbi->blocks_per_seg * p->ofs_unit;
225 else if (p->gc_mode == GC_CB)
226 return UINT_MAX;
227 else
228 return 0;
229}
230
231static unsigned int check_bg_victims(struct f2fs_sb_info *sbi)
232{
233 struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
234 unsigned int secno;
235
236
237
238
239
240
241 for_each_set_bit(secno, dirty_i->victim_secmap, MAIN_SECS(sbi)) {
242 if (sec_usage_check(sbi, secno))
243 continue;
244 clear_bit(secno, dirty_i->victim_secmap);
245 return GET_SEG_FROM_SEC(sbi, secno);
246 }
247 return NULL_SEGNO;
248}
249
250static unsigned int get_cb_cost(struct f2fs_sb_info *sbi, unsigned int segno)
251{
252 struct sit_info *sit_i = SIT_I(sbi);
253 unsigned int secno = GET_SEC_FROM_SEG(sbi, segno);
254 unsigned int start = GET_SEG_FROM_SEC(sbi, secno);
255 unsigned long long mtime = 0;
256 unsigned int vblocks;
257 unsigned char age = 0;
258 unsigned char u;
259 unsigned int i;
260
261 for (i = 0; i < sbi->segs_per_sec; i++)
262 mtime += get_seg_entry(sbi, start + i)->mtime;
263 vblocks = get_valid_blocks(sbi, segno, true);
264
265 mtime = div_u64(mtime, sbi->segs_per_sec);
266 vblocks = div_u64(vblocks, sbi->segs_per_sec);
267
268 u = (vblocks * 100) >> sbi->log_blocks_per_seg;
269
270
271 if (mtime < sit_i->min_mtime)
272 sit_i->min_mtime = mtime;
273 if (mtime > sit_i->max_mtime)
274 sit_i->max_mtime = mtime;
275 if (sit_i->max_mtime != sit_i->min_mtime)
276 age = 100 - div64_u64(100 * (mtime - sit_i->min_mtime),
277 sit_i->max_mtime - sit_i->min_mtime);
278
279 return UINT_MAX - ((100 * (100 - u) * age) / (100 + u));
280}
281
282static inline unsigned int get_gc_cost(struct f2fs_sb_info *sbi,
283 unsigned int segno, struct victim_sel_policy *p)
284{
285 if (p->alloc_mode == SSR)
286 return get_seg_entry(sbi, segno)->ckpt_valid_blocks;
287
288
289 if (p->gc_mode == GC_GREEDY)
290 return get_valid_blocks(sbi, segno, true);
291 else
292 return get_cb_cost(sbi, segno);
293}
294
295static unsigned int count_bits(const unsigned long *addr,
296 unsigned int offset, unsigned int len)
297{
298 unsigned int end = offset + len, sum = 0;
299
300 while (offset < end) {
301 if (test_bit(offset++, addr))
302 ++sum;
303 }
304 return sum;
305}
306
307
308
309
310
311
312
313
314
315static int get_victim_by_default(struct f2fs_sb_info *sbi,
316 unsigned int *result, int gc_type, int type, char alloc_mode)
317{
318 struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
319 struct sit_info *sm = SIT_I(sbi);
320 struct victim_sel_policy p;
321 unsigned int secno, last_victim;
322 unsigned int last_segment;
323 unsigned int nsearched = 0;
324
325 mutex_lock(&dirty_i->seglist_lock);
326 last_segment = MAIN_SECS(sbi) * sbi->segs_per_sec;
327
328 p.alloc_mode = alloc_mode;
329 select_policy(sbi, gc_type, type, &p);
330
331 p.min_segno = NULL_SEGNO;
332 p.min_cost = get_max_cost(sbi, &p);
333
334 if (*result != NULL_SEGNO) {
335 if (get_valid_blocks(sbi, *result, false) &&
336 !sec_usage_check(sbi, GET_SEC_FROM_SEG(sbi, *result)))
337 p.min_segno = *result;
338 goto out;
339 }
340
341 if (p.max_search == 0)
342 goto out;
343
344 if (__is_large_section(sbi) && p.alloc_mode == LFS) {
345 if (sbi->next_victim_seg[BG_GC] != NULL_SEGNO) {
346 p.min_segno = sbi->next_victim_seg[BG_GC];
347 *result = p.min_segno;
348 sbi->next_victim_seg[BG_GC] = NULL_SEGNO;
349 goto got_result;
350 }
351 if (gc_type == FG_GC &&
352 sbi->next_victim_seg[FG_GC] != NULL_SEGNO) {
353 p.min_segno = sbi->next_victim_seg[FG_GC];
354 *result = p.min_segno;
355 sbi->next_victim_seg[FG_GC] = NULL_SEGNO;
356 goto got_result;
357 }
358 }
359
360 last_victim = sm->last_victim[p.gc_mode];
361 if (p.alloc_mode == LFS && gc_type == FG_GC) {
362 p.min_segno = check_bg_victims(sbi);
363 if (p.min_segno != NULL_SEGNO)
364 goto got_it;
365 }
366
367 while (1) {
368 unsigned long cost;
369 unsigned int segno;
370
371 segno = find_next_bit(p.dirty_segmap, last_segment, p.offset);
372 if (segno >= last_segment) {
373 if (sm->last_victim[p.gc_mode]) {
374 last_segment =
375 sm->last_victim[p.gc_mode];
376 sm->last_victim[p.gc_mode] = 0;
377 p.offset = 0;
378 continue;
379 }
380 break;
381 }
382
383 p.offset = segno + p.ofs_unit;
384 if (p.ofs_unit > 1) {
385 p.offset -= segno % p.ofs_unit;
386 nsearched += count_bits(p.dirty_segmap,
387 p.offset - p.ofs_unit,
388 p.ofs_unit);
389 } else {
390 nsearched++;
391 }
392
393#ifdef CONFIG_F2FS_CHECK_FS
394
395
396
397
398
399 if (test_bit(segno, sm->invalid_segmap))
400 goto next;
401#endif
402
403 secno = GET_SEC_FROM_SEG(sbi, segno);
404
405 if (sec_usage_check(sbi, secno))
406 goto next;
407
408 if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED) &&
409 get_ckpt_valid_blocks(sbi, segno) &&
410 p.alloc_mode != SSR))
411 goto next;
412 if (gc_type == BG_GC && test_bit(secno, dirty_i->victim_secmap))
413 goto next;
414
415 cost = get_gc_cost(sbi, segno, &p);
416
417 if (p.min_cost > cost) {
418 p.min_segno = segno;
419 p.min_cost = cost;
420 }
421next:
422 if (nsearched >= p.max_search) {
423 if (!sm->last_victim[p.gc_mode] && segno <= last_victim)
424 sm->last_victim[p.gc_mode] = last_victim + 1;
425 else
426 sm->last_victim[p.gc_mode] = segno + 1;
427 sm->last_victim[p.gc_mode] %=
428 (MAIN_SECS(sbi) * sbi->segs_per_sec);
429 break;
430 }
431 }
432 if (p.min_segno != NULL_SEGNO) {
433got_it:
434 *result = (p.min_segno / p.ofs_unit) * p.ofs_unit;
435got_result:
436 if (p.alloc_mode == LFS) {
437 secno = GET_SEC_FROM_SEG(sbi, p.min_segno);
438 if (gc_type == FG_GC)
439 sbi->cur_victim_sec = secno;
440 else
441 set_bit(secno, dirty_i->victim_secmap);
442 }
443
444 }
445out:
446 if (p.min_segno != NULL_SEGNO)
447 trace_f2fs_get_victim(sbi->sb, type, gc_type, &p,
448 sbi->cur_victim_sec,
449 prefree_segments(sbi), free_segments(sbi));
450 mutex_unlock(&dirty_i->seglist_lock);
451
452 return (p.min_segno == NULL_SEGNO) ? 0 : 1;
453}
454
455static const struct victim_selection default_v_ops = {
456 .get_victim = get_victim_by_default,
457};
458
459static struct inode *find_gc_inode(struct gc_inode_list *gc_list, nid_t ino)
460{
461 struct inode_entry *ie;
462
463 ie = radix_tree_lookup(&gc_list->iroot, ino);
464 if (ie)
465 return ie->inode;
466 return NULL;
467}
468
469static void add_gc_inode(struct gc_inode_list *gc_list, struct inode *inode)
470{
471 struct inode_entry *new_ie;
472
473 if (inode == find_gc_inode(gc_list, inode->i_ino)) {
474 iput(inode);
475 return;
476 }
477 new_ie = f2fs_kmem_cache_alloc(f2fs_inode_entry_slab, GFP_NOFS);
478 new_ie->inode = inode;
479
480 f2fs_radix_tree_insert(&gc_list->iroot, inode->i_ino, new_ie);
481 list_add_tail(&new_ie->list, &gc_list->ilist);
482}
483
484static void put_gc_inode(struct gc_inode_list *gc_list)
485{
486 struct inode_entry *ie, *next_ie;
487 list_for_each_entry_safe(ie, next_ie, &gc_list->ilist, list) {
488 radix_tree_delete(&gc_list->iroot, ie->inode->i_ino);
489 iput(ie->inode);
490 list_del(&ie->list);
491 kmem_cache_free(f2fs_inode_entry_slab, ie);
492 }
493}
494
495static int check_valid_map(struct f2fs_sb_info *sbi,
496 unsigned int segno, int offset)
497{
498 struct sit_info *sit_i = SIT_I(sbi);
499 struct seg_entry *sentry;
500 int ret;
501
502 down_read(&sit_i->sentry_lock);
503 sentry = get_seg_entry(sbi, segno);
504 ret = f2fs_test_bit(offset, sentry->cur_valid_map);
505 up_read(&sit_i->sentry_lock);
506 return ret;
507}
508
509
510
511
512
513
514static int gc_node_segment(struct f2fs_sb_info *sbi,
515 struct f2fs_summary *sum, unsigned int segno, int gc_type)
516{
517 struct f2fs_summary *entry;
518 block_t start_addr;
519 int off;
520 int phase = 0;
521 bool fggc = (gc_type == FG_GC);
522 int submitted = 0;
523
524 start_addr = START_BLOCK(sbi, segno);
525
526next_step:
527 entry = sum;
528
529 if (fggc && phase == 2)
530 atomic_inc(&sbi->wb_sync_req[NODE]);
531
532 for (off = 0; off < sbi->blocks_per_seg; off++, entry++) {
533 nid_t nid = le32_to_cpu(entry->nid);
534 struct page *node_page;
535 struct node_info ni;
536 int err;
537
538
539 if (gc_type == BG_GC && has_not_enough_free_secs(sbi, 0, 0))
540 return submitted;
541
542 if (check_valid_map(sbi, segno, off) == 0)
543 continue;
544
545 if (phase == 0) {
546 f2fs_ra_meta_pages(sbi, NAT_BLOCK_OFFSET(nid), 1,
547 META_NAT, true);
548 continue;
549 }
550
551 if (phase == 1) {
552 f2fs_ra_node_page(sbi, nid);
553 continue;
554 }
555
556
557 node_page = f2fs_get_node_page(sbi, nid);
558 if (IS_ERR(node_page))
559 continue;
560
561
562 if (check_valid_map(sbi, segno, off) == 0) {
563 f2fs_put_page(node_page, 1);
564 continue;
565 }
566
567 if (f2fs_get_node_info(sbi, nid, &ni)) {
568 f2fs_put_page(node_page, 1);
569 continue;
570 }
571
572 if (ni.blk_addr != start_addr + off) {
573 f2fs_put_page(node_page, 1);
574 continue;
575 }
576
577 err = f2fs_move_node_page(node_page, gc_type);
578 if (!err && gc_type == FG_GC)
579 submitted++;
580 stat_inc_node_blk_count(sbi, 1, gc_type);
581 }
582
583 if (++phase < 3)
584 goto next_step;
585
586 if (fggc)
587 atomic_dec(&sbi->wb_sync_req[NODE]);
588 return submitted;
589}
590
591
592
593
594
595
596
597
598block_t f2fs_start_bidx_of_node(unsigned int node_ofs, struct inode *inode)
599{
600 unsigned int indirect_blks = 2 * NIDS_PER_BLOCK + 4;
601 unsigned int bidx;
602
603 if (node_ofs == 0)
604 return 0;
605
606 if (node_ofs <= 2) {
607 bidx = node_ofs - 1;
608 } else if (node_ofs <= indirect_blks) {
609 int dec = (node_ofs - 4) / (NIDS_PER_BLOCK + 1);
610 bidx = node_ofs - 2 - dec;
611 } else {
612 int dec = (node_ofs - indirect_blks - 3) / (NIDS_PER_BLOCK + 1);
613 bidx = node_ofs - 5 - dec;
614 }
615 return bidx * ADDRS_PER_BLOCK(inode) + ADDRS_PER_INODE(inode);
616}
617
618static bool is_alive(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
619 struct node_info *dni, block_t blkaddr, unsigned int *nofs)
620{
621 struct page *node_page;
622 nid_t nid;
623 unsigned int ofs_in_node;
624 block_t source_blkaddr;
625
626 nid = le32_to_cpu(sum->nid);
627 ofs_in_node = le16_to_cpu(sum->ofs_in_node);
628
629 node_page = f2fs_get_node_page(sbi, nid);
630 if (IS_ERR(node_page))
631 return false;
632
633 if (f2fs_get_node_info(sbi, nid, dni)) {
634 f2fs_put_page(node_page, 1);
635 return false;
636 }
637
638 if (sum->version != dni->version) {
639 f2fs_warn(sbi, "%s: valid data with mismatched node version.",
640 __func__);
641 set_sbi_flag(sbi, SBI_NEED_FSCK);
642 }
643
644 *nofs = ofs_of_node(node_page);
645 source_blkaddr = data_blkaddr(NULL, node_page, ofs_in_node);
646 f2fs_put_page(node_page, 1);
647
648 if (source_blkaddr != blkaddr) {
649#ifdef CONFIG_F2FS_CHECK_FS
650 unsigned int segno = GET_SEGNO(sbi, blkaddr);
651 unsigned long offset = GET_BLKOFF_FROM_SEG0(sbi, blkaddr);
652
653 if (unlikely(check_valid_map(sbi, segno, offset))) {
654 if (!test_and_set_bit(segno, SIT_I(sbi)->invalid_segmap)) {
655 f2fs_err(sbi, "mismatched blkaddr %u (source_blkaddr %u) in seg %u\n",
656 blkaddr, source_blkaddr, segno);
657 f2fs_bug_on(sbi, 1);
658 }
659 }
660#endif
661 return false;
662 }
663 return true;
664}
665
666static int ra_data_block(struct inode *inode, pgoff_t index)
667{
668 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
669 struct address_space *mapping = inode->i_mapping;
670 struct dnode_of_data dn;
671 struct page *page;
672 struct extent_info ei = {0, 0, 0};
673 struct f2fs_io_info fio = {
674 .sbi = sbi,
675 .ino = inode->i_ino,
676 .type = DATA,
677 .temp = COLD,
678 .op = REQ_OP_READ,
679 .op_flags = 0,
680 .encrypted_page = NULL,
681 .in_list = false,
682 .retry = false,
683 };
684 int err;
685
686 page = f2fs_grab_cache_page(mapping, index, true);
687 if (!page)
688 return -ENOMEM;
689
690 if (f2fs_lookup_extent_cache(inode, index, &ei)) {
691 dn.data_blkaddr = ei.blk + index - ei.fofs;
692 if (unlikely(!f2fs_is_valid_blkaddr(sbi, dn.data_blkaddr,
693 DATA_GENERIC_ENHANCE_READ))) {
694 err = -EFSCORRUPTED;
695 goto put_page;
696 }
697 goto got_it;
698 }
699
700 set_new_dnode(&dn, inode, NULL, NULL, 0);
701 err = f2fs_get_dnode_of_data(&dn, index, LOOKUP_NODE);
702 if (err)
703 goto put_page;
704 f2fs_put_dnode(&dn);
705
706 if (!__is_valid_data_blkaddr(dn.data_blkaddr)) {
707 err = -ENOENT;
708 goto put_page;
709 }
710 if (unlikely(!f2fs_is_valid_blkaddr(sbi, dn.data_blkaddr,
711 DATA_GENERIC_ENHANCE))) {
712 err = -EFSCORRUPTED;
713 goto put_page;
714 }
715got_it:
716
717 fio.page = page;
718 fio.new_blkaddr = fio.old_blkaddr = dn.data_blkaddr;
719
720
721
722
723
724 f2fs_wait_on_page_writeback(page, DATA, true, true);
725
726 f2fs_wait_on_block_writeback(inode, dn.data_blkaddr);
727
728 fio.encrypted_page = f2fs_pagecache_get_page(META_MAPPING(sbi),
729 dn.data_blkaddr,
730 FGP_LOCK | FGP_CREAT, GFP_NOFS);
731 if (!fio.encrypted_page) {
732 err = -ENOMEM;
733 goto put_page;
734 }
735
736 err = f2fs_submit_page_bio(&fio);
737 if (err)
738 goto put_encrypted_page;
739 f2fs_put_page(fio.encrypted_page, 0);
740 f2fs_put_page(page, 1);
741
742 f2fs_update_iostat(sbi, FS_DATA_READ_IO, F2FS_BLKSIZE);
743 f2fs_update_iostat(sbi, FS_GDATA_READ_IO, F2FS_BLKSIZE);
744
745 return 0;
746put_encrypted_page:
747 f2fs_put_page(fio.encrypted_page, 1);
748put_page:
749 f2fs_put_page(page, 1);
750 return err;
751}
752
753
754
755
756
757static int move_data_block(struct inode *inode, block_t bidx,
758 int gc_type, unsigned int segno, int off)
759{
760 struct f2fs_io_info fio = {
761 .sbi = F2FS_I_SB(inode),
762 .ino = inode->i_ino,
763 .type = DATA,
764 .temp = COLD,
765 .op = REQ_OP_READ,
766 .op_flags = 0,
767 .encrypted_page = NULL,
768 .in_list = false,
769 .retry = false,
770 };
771 struct dnode_of_data dn;
772 struct f2fs_summary sum;
773 struct node_info ni;
774 struct page *page, *mpage;
775 block_t newaddr;
776 int err = 0;
777 bool lfs_mode = f2fs_lfs_mode(fio.sbi);
778
779
780 page = f2fs_grab_cache_page(inode->i_mapping, bidx, false);
781 if (!page)
782 return -ENOMEM;
783
784 if (!check_valid_map(F2FS_I_SB(inode), segno, off)) {
785 err = -ENOENT;
786 goto out;
787 }
788
789 if (f2fs_is_atomic_file(inode)) {
790 F2FS_I(inode)->i_gc_failures[GC_FAILURE_ATOMIC]++;
791 F2FS_I_SB(inode)->skipped_atomic_files[gc_type]++;
792 err = -EAGAIN;
793 goto out;
794 }
795
796 if (f2fs_is_pinned_file(inode)) {
797 f2fs_pin_file_control(inode, true);
798 err = -EAGAIN;
799 goto out;
800 }
801
802 set_new_dnode(&dn, inode, NULL, NULL, 0);
803 err = f2fs_get_dnode_of_data(&dn, bidx, LOOKUP_NODE);
804 if (err)
805 goto out;
806
807 if (unlikely(dn.data_blkaddr == NULL_ADDR)) {
808 ClearPageUptodate(page);
809 err = -ENOENT;
810 goto put_out;
811 }
812
813
814
815
816
817 f2fs_wait_on_page_writeback(page, DATA, true, true);
818
819 f2fs_wait_on_block_writeback(inode, dn.data_blkaddr);
820
821 err = f2fs_get_node_info(fio.sbi, dn.nid, &ni);
822 if (err)
823 goto put_out;
824
825 set_summary(&sum, dn.nid, dn.ofs_in_node, ni.version);
826
827
828 fio.page = page;
829 fio.new_blkaddr = fio.old_blkaddr = dn.data_blkaddr;
830
831 if (lfs_mode)
832 down_write(&fio.sbi->io_order_lock);
833
834 mpage = f2fs_grab_cache_page(META_MAPPING(fio.sbi),
835 fio.old_blkaddr, false);
836 if (!mpage)
837 goto up_out;
838
839 fio.encrypted_page = mpage;
840
841
842 if (!PageUptodate(mpage)) {
843 err = f2fs_submit_page_bio(&fio);
844 if (err) {
845 f2fs_put_page(mpage, 1);
846 goto up_out;
847 }
848
849 f2fs_update_iostat(fio.sbi, FS_DATA_READ_IO, F2FS_BLKSIZE);
850 f2fs_update_iostat(fio.sbi, FS_GDATA_READ_IO, F2FS_BLKSIZE);
851
852 lock_page(mpage);
853 if (unlikely(mpage->mapping != META_MAPPING(fio.sbi) ||
854 !PageUptodate(mpage))) {
855 err = -EIO;
856 f2fs_put_page(mpage, 1);
857 goto up_out;
858 }
859 }
860
861 f2fs_allocate_data_block(fio.sbi, NULL, fio.old_blkaddr, &newaddr,
862 &sum, CURSEG_COLD_DATA, NULL, false);
863
864 fio.encrypted_page = f2fs_pagecache_get_page(META_MAPPING(fio.sbi),
865 newaddr, FGP_LOCK | FGP_CREAT, GFP_NOFS);
866 if (!fio.encrypted_page) {
867 err = -ENOMEM;
868 f2fs_put_page(mpage, 1);
869 goto recover_block;
870 }
871
872
873 f2fs_wait_on_page_writeback(fio.encrypted_page, DATA, true, true);
874 memcpy(page_address(fio.encrypted_page),
875 page_address(mpage), PAGE_SIZE);
876 f2fs_put_page(mpage, 1);
877 invalidate_mapping_pages(META_MAPPING(fio.sbi),
878 fio.old_blkaddr, fio.old_blkaddr);
879
880 set_page_dirty(fio.encrypted_page);
881 if (clear_page_dirty_for_io(fio.encrypted_page))
882 dec_page_count(fio.sbi, F2FS_DIRTY_META);
883
884 set_page_writeback(fio.encrypted_page);
885 ClearPageError(page);
886
887
888 f2fs_wait_on_page_writeback(dn.node_page, NODE, true, true);
889
890 fio.op = REQ_OP_WRITE;
891 fio.op_flags = REQ_SYNC;
892 fio.new_blkaddr = newaddr;
893 f2fs_submit_page_write(&fio);
894 if (fio.retry) {
895 err = -EAGAIN;
896 if (PageWriteback(fio.encrypted_page))
897 end_page_writeback(fio.encrypted_page);
898 goto put_page_out;
899 }
900
901 f2fs_update_iostat(fio.sbi, FS_GC_DATA_IO, F2FS_BLKSIZE);
902
903 f2fs_update_data_blkaddr(&dn, newaddr);
904 set_inode_flag(inode, FI_APPEND_WRITE);
905 if (page->index == 0)
906 set_inode_flag(inode, FI_FIRST_BLOCK_WRITTEN);
907put_page_out:
908 f2fs_put_page(fio.encrypted_page, 1);
909recover_block:
910 if (err)
911 f2fs_do_replace_block(fio.sbi, &sum, newaddr, fio.old_blkaddr,
912 true, true);
913up_out:
914 if (lfs_mode)
915 up_write(&fio.sbi->io_order_lock);
916put_out:
917 f2fs_put_dnode(&dn);
918out:
919 f2fs_put_page(page, 1);
920 return err;
921}
922
923static int move_data_page(struct inode *inode, block_t bidx, int gc_type,
924 unsigned int segno, int off)
925{
926 struct page *page;
927 int err = 0;
928
929 page = f2fs_get_lock_data_page(inode, bidx, true);
930 if (IS_ERR(page))
931 return PTR_ERR(page);
932
933 if (!check_valid_map(F2FS_I_SB(inode), segno, off)) {
934 err = -ENOENT;
935 goto out;
936 }
937
938 if (f2fs_is_atomic_file(inode)) {
939 F2FS_I(inode)->i_gc_failures[GC_FAILURE_ATOMIC]++;
940 F2FS_I_SB(inode)->skipped_atomic_files[gc_type]++;
941 err = -EAGAIN;
942 goto out;
943 }
944 if (f2fs_is_pinned_file(inode)) {
945 if (gc_type == FG_GC)
946 f2fs_pin_file_control(inode, true);
947 err = -EAGAIN;
948 goto out;
949 }
950
951 if (gc_type == BG_GC) {
952 if (PageWriteback(page)) {
953 err = -EAGAIN;
954 goto out;
955 }
956 set_page_dirty(page);
957 set_cold_data(page);
958 } else {
959 struct f2fs_io_info fio = {
960 .sbi = F2FS_I_SB(inode),
961 .ino = inode->i_ino,
962 .type = DATA,
963 .temp = COLD,
964 .op = REQ_OP_WRITE,
965 .op_flags = REQ_SYNC,
966 .old_blkaddr = NULL_ADDR,
967 .page = page,
968 .encrypted_page = NULL,
969 .need_lock = LOCK_REQ,
970 .io_type = FS_GC_DATA_IO,
971 };
972 bool is_dirty = PageDirty(page);
973
974retry:
975 f2fs_wait_on_page_writeback(page, DATA, true, true);
976
977 set_page_dirty(page);
978 if (clear_page_dirty_for_io(page)) {
979 inode_dec_dirty_pages(inode);
980 f2fs_remove_dirty_inode(inode);
981 }
982
983 set_cold_data(page);
984
985 err = f2fs_do_write_data_page(&fio);
986 if (err) {
987 clear_cold_data(page);
988 if (err == -ENOMEM) {
989 congestion_wait(BLK_RW_ASYNC,
990 DEFAULT_IO_TIMEOUT);
991 goto retry;
992 }
993 if (is_dirty)
994 set_page_dirty(page);
995 }
996 }
997out:
998 f2fs_put_page(page, 1);
999 return err;
1000}
1001
1002
1003
1004
1005
1006
1007
1008
1009static int gc_data_segment(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
1010 struct gc_inode_list *gc_list, unsigned int segno, int gc_type)
1011{
1012 struct super_block *sb = sbi->sb;
1013 struct f2fs_summary *entry;
1014 block_t start_addr;
1015 int off;
1016 int phase = 0;
1017 int submitted = 0;
1018
1019 start_addr = START_BLOCK(sbi, segno);
1020
1021next_step:
1022 entry = sum;
1023
1024 for (off = 0; off < sbi->blocks_per_seg; off++, entry++) {
1025 struct page *data_page;
1026 struct inode *inode;
1027 struct node_info dni;
1028 unsigned int ofs_in_node, nofs;
1029 block_t start_bidx;
1030 nid_t nid = le32_to_cpu(entry->nid);
1031
1032
1033
1034
1035
1036
1037 if ((gc_type == BG_GC && has_not_enough_free_secs(sbi, 0, 0)) ||
1038 get_valid_blocks(sbi, segno, true) ==
1039 BLKS_PER_SEC(sbi))
1040 return submitted;
1041
1042 if (check_valid_map(sbi, segno, off) == 0)
1043 continue;
1044
1045 if (phase == 0) {
1046 f2fs_ra_meta_pages(sbi, NAT_BLOCK_OFFSET(nid), 1,
1047 META_NAT, true);
1048 continue;
1049 }
1050
1051 if (phase == 1) {
1052 f2fs_ra_node_page(sbi, nid);
1053 continue;
1054 }
1055
1056
1057 if (!is_alive(sbi, entry, &dni, start_addr + off, &nofs))
1058 continue;
1059
1060 if (phase == 2) {
1061 f2fs_ra_node_page(sbi, dni.ino);
1062 continue;
1063 }
1064
1065 ofs_in_node = le16_to_cpu(entry->ofs_in_node);
1066
1067 if (phase == 3) {
1068 inode = f2fs_iget(sb, dni.ino);
1069 if (IS_ERR(inode) || is_bad_inode(inode)) {
1070 set_sbi_flag(sbi, SBI_NEED_FSCK);
1071 continue;
1072 }
1073
1074 if (!down_write_trylock(
1075 &F2FS_I(inode)->i_gc_rwsem[WRITE])) {
1076 iput(inode);
1077 sbi->skipped_gc_rwsem++;
1078 continue;
1079 }
1080
1081 start_bidx = f2fs_start_bidx_of_node(nofs, inode) +
1082 ofs_in_node;
1083
1084 if (f2fs_post_read_required(inode)) {
1085 int err = ra_data_block(inode, start_bidx);
1086
1087 up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
1088 if (err) {
1089 iput(inode);
1090 continue;
1091 }
1092 add_gc_inode(gc_list, inode);
1093 continue;
1094 }
1095
1096 data_page = f2fs_get_read_data_page(inode,
1097 start_bidx, REQ_RAHEAD, true);
1098 up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
1099 if (IS_ERR(data_page)) {
1100 iput(inode);
1101 continue;
1102 }
1103
1104 f2fs_put_page(data_page, 0);
1105 add_gc_inode(gc_list, inode);
1106 continue;
1107 }
1108
1109
1110 inode = find_gc_inode(gc_list, dni.ino);
1111 if (inode) {
1112 struct f2fs_inode_info *fi = F2FS_I(inode);
1113 bool locked = false;
1114 int err;
1115
1116 if (S_ISREG(inode->i_mode)) {
1117 if (!down_write_trylock(&fi->i_gc_rwsem[READ]))
1118 continue;
1119 if (!down_write_trylock(
1120 &fi->i_gc_rwsem[WRITE])) {
1121 sbi->skipped_gc_rwsem++;
1122 up_write(&fi->i_gc_rwsem[READ]);
1123 continue;
1124 }
1125 locked = true;
1126
1127
1128 inode_dio_wait(inode);
1129 }
1130
1131 start_bidx = f2fs_start_bidx_of_node(nofs, inode)
1132 + ofs_in_node;
1133 if (f2fs_post_read_required(inode))
1134 err = move_data_block(inode, start_bidx,
1135 gc_type, segno, off);
1136 else
1137 err = move_data_page(inode, start_bidx, gc_type,
1138 segno, off);
1139
1140 if (!err && (gc_type == FG_GC ||
1141 f2fs_post_read_required(inode)))
1142 submitted++;
1143
1144 if (locked) {
1145 up_write(&fi->i_gc_rwsem[WRITE]);
1146 up_write(&fi->i_gc_rwsem[READ]);
1147 }
1148
1149 stat_inc_data_blk_count(sbi, 1, gc_type);
1150 }
1151 }
1152
1153 if (++phase < 5)
1154 goto next_step;
1155
1156 return submitted;
1157}
1158
1159static int __get_victim(struct f2fs_sb_info *sbi, unsigned int *victim,
1160 int gc_type)
1161{
1162 struct sit_info *sit_i = SIT_I(sbi);
1163 int ret;
1164
1165 down_write(&sit_i->sentry_lock);
1166 ret = DIRTY_I(sbi)->v_ops->get_victim(sbi, victim, gc_type,
1167 NO_CHECK_TYPE, LFS);
1168 up_write(&sit_i->sentry_lock);
1169 return ret;
1170}
1171
1172static int do_garbage_collect(struct f2fs_sb_info *sbi,
1173 unsigned int start_segno,
1174 struct gc_inode_list *gc_list, int gc_type)
1175{
1176 struct page *sum_page;
1177 struct f2fs_summary_block *sum;
1178 struct blk_plug plug;
1179 unsigned int segno = start_segno;
1180 unsigned int end_segno = start_segno + sbi->segs_per_sec;
1181 int seg_freed = 0, migrated = 0;
1182 unsigned char type = IS_DATASEG(get_seg_entry(sbi, segno)->type) ?
1183 SUM_TYPE_DATA : SUM_TYPE_NODE;
1184 int submitted = 0;
1185
1186 if (__is_large_section(sbi))
1187 end_segno = rounddown(end_segno, sbi->segs_per_sec);
1188
1189
1190 if (__is_large_section(sbi))
1191 f2fs_ra_meta_pages(sbi, GET_SUM_BLOCK(sbi, segno),
1192 end_segno - segno, META_SSA, true);
1193
1194
1195 while (segno < end_segno) {
1196 sum_page = f2fs_get_sum_page(sbi, segno++);
1197 if (IS_ERR(sum_page)) {
1198 int err = PTR_ERR(sum_page);
1199
1200 end_segno = segno - 1;
1201 for (segno = start_segno; segno < end_segno; segno++) {
1202 sum_page = find_get_page(META_MAPPING(sbi),
1203 GET_SUM_BLOCK(sbi, segno));
1204 f2fs_put_page(sum_page, 0);
1205 f2fs_put_page(sum_page, 0);
1206 }
1207 return err;
1208 }
1209 unlock_page(sum_page);
1210 }
1211
1212 blk_start_plug(&plug);
1213
1214 for (segno = start_segno; segno < end_segno; segno++) {
1215
1216
1217 sum_page = find_get_page(META_MAPPING(sbi),
1218 GET_SUM_BLOCK(sbi, segno));
1219 f2fs_put_page(sum_page, 0);
1220
1221 if (get_valid_blocks(sbi, segno, false) == 0)
1222 goto freed;
1223 if (gc_type == BG_GC && __is_large_section(sbi) &&
1224 migrated >= sbi->migration_granularity)
1225 goto skip;
1226 if (!PageUptodate(sum_page) || unlikely(f2fs_cp_error(sbi)))
1227 goto skip;
1228
1229 sum = page_address(sum_page);
1230 if (type != GET_SUM_TYPE((&sum->footer))) {
1231 f2fs_err(sbi, "Inconsistent segment (%u) type [%d, %d] in SSA and SIT",
1232 segno, type, GET_SUM_TYPE((&sum->footer)));
1233 set_sbi_flag(sbi, SBI_NEED_FSCK);
1234 f2fs_stop_checkpoint(sbi, false);
1235 goto skip;
1236 }
1237
1238
1239
1240
1241
1242
1243
1244
1245 if (type == SUM_TYPE_NODE)
1246 submitted += gc_node_segment(sbi, sum->entries, segno,
1247 gc_type);
1248 else
1249 submitted += gc_data_segment(sbi, sum->entries, gc_list,
1250 segno, gc_type);
1251
1252 stat_inc_seg_count(sbi, type, gc_type);
1253 migrated++;
1254
1255freed:
1256 if (gc_type == FG_GC &&
1257 get_valid_blocks(sbi, segno, false) == 0)
1258 seg_freed++;
1259
1260 if (__is_large_section(sbi) && segno + 1 < end_segno)
1261 sbi->next_victim_seg[gc_type] = segno + 1;
1262skip:
1263 f2fs_put_page(sum_page, 0);
1264 }
1265
1266 if (submitted)
1267 f2fs_submit_merged_write(sbi,
1268 (type == SUM_TYPE_NODE) ? NODE : DATA);
1269
1270 blk_finish_plug(&plug);
1271
1272 stat_inc_call_count(sbi->stat_info);
1273
1274 return seg_freed;
1275}
1276
1277int f2fs_gc(struct f2fs_sb_info *sbi, bool sync,
1278 bool background, unsigned int segno)
1279{
1280 int gc_type = sync ? FG_GC : BG_GC;
1281 int sec_freed = 0, seg_freed = 0, total_freed = 0;
1282 int ret = 0;
1283 struct cp_control cpc;
1284 unsigned int init_segno = segno;
1285 struct gc_inode_list gc_list = {
1286 .ilist = LIST_HEAD_INIT(gc_list.ilist),
1287 .iroot = RADIX_TREE_INIT(gc_list.iroot, GFP_NOFS),
1288 };
1289 unsigned long long last_skipped = sbi->skipped_atomic_files[FG_GC];
1290 unsigned long long first_skipped;
1291 unsigned int skipped_round = 0, round = 0;
1292
1293 trace_f2fs_gc_begin(sbi->sb, sync, background,
1294 get_pages(sbi, F2FS_DIRTY_NODES),
1295 get_pages(sbi, F2FS_DIRTY_DENTS),
1296 get_pages(sbi, F2FS_DIRTY_IMETA),
1297 free_sections(sbi),
1298 free_segments(sbi),
1299 reserved_segments(sbi),
1300 prefree_segments(sbi));
1301
1302 cpc.reason = __get_cp_reason(sbi);
1303 sbi->skipped_gc_rwsem = 0;
1304 first_skipped = last_skipped;
1305gc_more:
1306 if (unlikely(!(sbi->sb->s_flags & SB_ACTIVE))) {
1307 ret = -EINVAL;
1308 goto stop;
1309 }
1310 if (unlikely(f2fs_cp_error(sbi))) {
1311 ret = -EIO;
1312 goto stop;
1313 }
1314
1315 if (gc_type == BG_GC && has_not_enough_free_secs(sbi, 0, 0)) {
1316
1317
1318
1319
1320
1321 if (prefree_segments(sbi) &&
1322 !is_sbi_flag_set(sbi, SBI_CP_DISABLED)) {
1323 ret = f2fs_write_checkpoint(sbi, &cpc);
1324 if (ret)
1325 goto stop;
1326 }
1327 if (has_not_enough_free_secs(sbi, 0, 0))
1328 gc_type = FG_GC;
1329 }
1330
1331
1332 if (gc_type == BG_GC && !background) {
1333 ret = -EINVAL;
1334 goto stop;
1335 }
1336 if (!__get_victim(sbi, &segno, gc_type)) {
1337 ret = -ENODATA;
1338 goto stop;
1339 }
1340
1341 seg_freed = do_garbage_collect(sbi, segno, &gc_list, gc_type);
1342 if (gc_type == FG_GC && seg_freed == sbi->segs_per_sec)
1343 sec_freed++;
1344 total_freed += seg_freed;
1345
1346 if (gc_type == FG_GC) {
1347 if (sbi->skipped_atomic_files[FG_GC] > last_skipped ||
1348 sbi->skipped_gc_rwsem)
1349 skipped_round++;
1350 last_skipped = sbi->skipped_atomic_files[FG_GC];
1351 round++;
1352 }
1353
1354 if (gc_type == FG_GC && seg_freed)
1355 sbi->cur_victim_sec = NULL_SEGNO;
1356
1357 if (sync)
1358 goto stop;
1359
1360 if (has_not_enough_free_secs(sbi, sec_freed, 0)) {
1361 if (skipped_round <= MAX_SKIP_GC_COUNT ||
1362 skipped_round * 2 < round) {
1363 segno = NULL_SEGNO;
1364 goto gc_more;
1365 }
1366
1367 if (first_skipped < last_skipped &&
1368 (last_skipped - first_skipped) >
1369 sbi->skipped_gc_rwsem) {
1370 f2fs_drop_inmem_pages_all(sbi, true);
1371 segno = NULL_SEGNO;
1372 goto gc_more;
1373 }
1374 if (gc_type == FG_GC && !is_sbi_flag_set(sbi, SBI_CP_DISABLED))
1375 ret = f2fs_write_checkpoint(sbi, &cpc);
1376 }
1377stop:
1378 SIT_I(sbi)->last_victim[ALLOC_NEXT] = 0;
1379 SIT_I(sbi)->last_victim[FLUSH_DEVICE] = init_segno;
1380
1381 trace_f2fs_gc_end(sbi->sb, ret, total_freed, sec_freed,
1382 get_pages(sbi, F2FS_DIRTY_NODES),
1383 get_pages(sbi, F2FS_DIRTY_DENTS),
1384 get_pages(sbi, F2FS_DIRTY_IMETA),
1385 free_sections(sbi),
1386 free_segments(sbi),
1387 reserved_segments(sbi),
1388 prefree_segments(sbi));
1389
1390 up_write(&sbi->gc_lock);
1391
1392 put_gc_inode(&gc_list);
1393
1394 if (sync && !ret)
1395 ret = sec_freed ? 0 : -EAGAIN;
1396 return ret;
1397}
1398
1399void f2fs_build_gc_manager(struct f2fs_sb_info *sbi)
1400{
1401 DIRTY_I(sbi)->v_ops = &default_v_ops;
1402
1403 sbi->gc_pin_file_threshold = DEF_GC_FAILED_PINNED_FILES;
1404
1405
1406 if (f2fs_is_multi_device(sbi) && !__is_large_section(sbi))
1407 SIT_I(sbi)->last_victim[ALLOC_NEXT] =
1408 GET_SEGNO(sbi, FDEV(0).end_blk) + 1;
1409}
1410
1411static int free_segment_range(struct f2fs_sb_info *sbi,
1412 unsigned int secs, bool gc_only)
1413{
1414 unsigned int segno, next_inuse, start, end;
1415 struct cp_control cpc = { CP_RESIZE, 0, 0, 0 };
1416 int gc_mode, gc_type;
1417 int err = 0;
1418 int type;
1419
1420
1421 MAIN_SECS(sbi) -= secs;
1422 start = MAIN_SECS(sbi) * sbi->segs_per_sec;
1423 end = MAIN_SEGS(sbi) - 1;
1424
1425 mutex_lock(&DIRTY_I(sbi)->seglist_lock);
1426 for (gc_mode = 0; gc_mode < MAX_GC_POLICY; gc_mode++)
1427 if (SIT_I(sbi)->last_victim[gc_mode] >= start)
1428 SIT_I(sbi)->last_victim[gc_mode] = 0;
1429
1430 for (gc_type = BG_GC; gc_type <= FG_GC; gc_type++)
1431 if (sbi->next_victim_seg[gc_type] >= start)
1432 sbi->next_victim_seg[gc_type] = NULL_SEGNO;
1433 mutex_unlock(&DIRTY_I(sbi)->seglist_lock);
1434
1435
1436 for (type = CURSEG_HOT_DATA; type < NR_CURSEG_TYPE; type++)
1437 allocate_segment_for_resize(sbi, type, start, end);
1438
1439
1440 for (segno = start; segno <= end; segno += sbi->segs_per_sec) {
1441 struct gc_inode_list gc_list = {
1442 .ilist = LIST_HEAD_INIT(gc_list.ilist),
1443 .iroot = RADIX_TREE_INIT(gc_list.iroot, GFP_NOFS),
1444 };
1445
1446 do_garbage_collect(sbi, segno, &gc_list, FG_GC);
1447 put_gc_inode(&gc_list);
1448
1449 if (!gc_only && get_valid_blocks(sbi, segno, true)) {
1450 err = -EAGAIN;
1451 goto out;
1452 }
1453 if (fatal_signal_pending(current)) {
1454 err = -ERESTARTSYS;
1455 goto out;
1456 }
1457 }
1458 if (gc_only)
1459 goto out;
1460
1461 err = f2fs_write_checkpoint(sbi, &cpc);
1462 if (err)
1463 goto out;
1464
1465 next_inuse = find_next_inuse(FREE_I(sbi), end + 1, start);
1466 if (next_inuse <= end) {
1467 f2fs_err(sbi, "segno %u should be free but still inuse!",
1468 next_inuse);
1469 f2fs_bug_on(sbi, 1);
1470 }
1471out:
1472 MAIN_SECS(sbi) += secs;
1473 return err;
1474}
1475
1476static void update_sb_metadata(struct f2fs_sb_info *sbi, int secs)
1477{
1478 struct f2fs_super_block *raw_sb = F2FS_RAW_SUPER(sbi);
1479 int section_count;
1480 int segment_count;
1481 int segment_count_main;
1482 long long block_count;
1483 int segs = secs * sbi->segs_per_sec;
1484
1485 down_write(&sbi->sb_lock);
1486
1487 section_count = le32_to_cpu(raw_sb->section_count);
1488 segment_count = le32_to_cpu(raw_sb->segment_count);
1489 segment_count_main = le32_to_cpu(raw_sb->segment_count_main);
1490 block_count = le64_to_cpu(raw_sb->block_count);
1491
1492 raw_sb->section_count = cpu_to_le32(section_count + secs);
1493 raw_sb->segment_count = cpu_to_le32(segment_count + segs);
1494 raw_sb->segment_count_main = cpu_to_le32(segment_count_main + segs);
1495 raw_sb->block_count = cpu_to_le64(block_count +
1496 (long long)segs * sbi->blocks_per_seg);
1497 if (f2fs_is_multi_device(sbi)) {
1498 int last_dev = sbi->s_ndevs - 1;
1499 int dev_segs =
1500 le32_to_cpu(raw_sb->devs[last_dev].total_segments);
1501
1502 raw_sb->devs[last_dev].total_segments =
1503 cpu_to_le32(dev_segs + segs);
1504 }
1505
1506 up_write(&sbi->sb_lock);
1507}
1508
1509static void update_fs_metadata(struct f2fs_sb_info *sbi, int secs)
1510{
1511 int segs = secs * sbi->segs_per_sec;
1512 long long blks = (long long)segs * sbi->blocks_per_seg;
1513 long long user_block_count =
1514 le64_to_cpu(F2FS_CKPT(sbi)->user_block_count);
1515
1516 SM_I(sbi)->segment_count = (int)SM_I(sbi)->segment_count + segs;
1517 MAIN_SEGS(sbi) = (int)MAIN_SEGS(sbi) + segs;
1518 MAIN_SECS(sbi) += secs;
1519 FREE_I(sbi)->free_sections = (int)FREE_I(sbi)->free_sections + secs;
1520 FREE_I(sbi)->free_segments = (int)FREE_I(sbi)->free_segments + segs;
1521 F2FS_CKPT(sbi)->user_block_count = cpu_to_le64(user_block_count + blks);
1522
1523 if (f2fs_is_multi_device(sbi)) {
1524 int last_dev = sbi->s_ndevs - 1;
1525
1526 FDEV(last_dev).total_segments =
1527 (int)FDEV(last_dev).total_segments + segs;
1528 FDEV(last_dev).end_blk =
1529 (long long)FDEV(last_dev).end_blk + blks;
1530#ifdef CONFIG_BLK_DEV_ZONED
1531 FDEV(last_dev).nr_blkz = (int)FDEV(last_dev).nr_blkz +
1532 (int)(blks >> sbi->log_blocks_per_blkz);
1533#endif
1534 }
1535}
1536
1537int f2fs_resize_fs(struct f2fs_sb_info *sbi, __u64 block_count)
1538{
1539 __u64 old_block_count, shrunk_blocks;
1540 struct cp_control cpc = { CP_RESIZE, 0, 0, 0 };
1541 unsigned int secs;
1542 int err = 0;
1543 __u32 rem;
1544
1545 old_block_count = le64_to_cpu(F2FS_RAW_SUPER(sbi)->block_count);
1546 if (block_count > old_block_count)
1547 return -EINVAL;
1548
1549 if (f2fs_is_multi_device(sbi)) {
1550 int last_dev = sbi->s_ndevs - 1;
1551 __u64 last_segs = FDEV(last_dev).total_segments;
1552
1553 if (block_count + last_segs * sbi->blocks_per_seg <=
1554 old_block_count)
1555 return -EINVAL;
1556 }
1557
1558
1559 div_u64_rem(block_count, BLKS_PER_SEC(sbi), &rem);
1560 if (rem)
1561 return -EINVAL;
1562
1563 if (block_count == old_block_count)
1564 return 0;
1565
1566 if (is_sbi_flag_set(sbi, SBI_NEED_FSCK)) {
1567 f2fs_err(sbi, "Should run fsck to repair first.");
1568 return -EFSCORRUPTED;
1569 }
1570
1571 if (test_opt(sbi, DISABLE_CHECKPOINT)) {
1572 f2fs_err(sbi, "Checkpoint should be enabled.");
1573 return -EINVAL;
1574 }
1575
1576 shrunk_blocks = old_block_count - block_count;
1577 secs = div_u64(shrunk_blocks, BLKS_PER_SEC(sbi));
1578
1579
1580 if (!down_write_trylock(&sbi->gc_lock))
1581 return -EAGAIN;
1582
1583
1584 f2fs_lock_op(sbi);
1585 err = free_segment_range(sbi, secs, true);
1586 f2fs_unlock_op(sbi);
1587 up_write(&sbi->gc_lock);
1588 if (err)
1589 return err;
1590
1591 set_sbi_flag(sbi, SBI_IS_RESIZEFS);
1592
1593 freeze_super(sbi->sb);
1594 down_write(&sbi->gc_lock);
1595 mutex_lock(&sbi->cp_mutex);
1596
1597 spin_lock(&sbi->stat_lock);
1598 if (shrunk_blocks + valid_user_blocks(sbi) +
1599 sbi->current_reserved_blocks + sbi->unusable_block_count +
1600 F2FS_OPTION(sbi).root_reserved_blocks > sbi->user_block_count)
1601 err = -ENOSPC;
1602 else
1603 sbi->user_block_count -= shrunk_blocks;
1604 spin_unlock(&sbi->stat_lock);
1605 if (err)
1606 goto out_err;
1607
1608 err = free_segment_range(sbi, secs, false);
1609 if (err)
1610 goto recover_out;
1611
1612 update_sb_metadata(sbi, -secs);
1613
1614 err = f2fs_commit_super(sbi, false);
1615 if (err) {
1616 update_sb_metadata(sbi, secs);
1617 goto recover_out;
1618 }
1619
1620 update_fs_metadata(sbi, -secs);
1621 clear_sbi_flag(sbi, SBI_IS_RESIZEFS);
1622 set_sbi_flag(sbi, SBI_IS_DIRTY);
1623
1624 err = f2fs_write_checkpoint(sbi, &cpc);
1625 if (err) {
1626 update_fs_metadata(sbi, secs);
1627 update_sb_metadata(sbi, secs);
1628 f2fs_commit_super(sbi, false);
1629 }
1630recover_out:
1631 if (err) {
1632 set_sbi_flag(sbi, SBI_NEED_FSCK);
1633 f2fs_err(sbi, "resize_fs failed, should run fsck to repair!");
1634
1635 spin_lock(&sbi->stat_lock);
1636 sbi->user_block_count += shrunk_blocks;
1637 spin_unlock(&sbi->stat_lock);
1638 }
1639out_err:
1640 mutex_unlock(&sbi->cp_mutex);
1641 up_write(&sbi->gc_lock);
1642 thaw_super(sbi->sb);
1643 clear_sbi_flag(sbi, SBI_IS_RESIZEFS);
1644 return err;
1645}
1646
