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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * fs/f2fs/gc.c
4 *
5 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
6 * http://www.samsung.com/
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 unsigned int count_bits(const unsigned long *addr,
25 unsigned int offset, unsigned int len);
26
27static int gc_thread_func(void *data)
28{
29 struct f2fs_sb_info *sbi = data;
30 struct f2fs_gc_kthread *gc_th = sbi->gc_thread;
31 wait_queue_head_t *wq = &sbi->gc_thread->gc_wait_queue_head;
32 unsigned int wait_ms;
33
34 wait_ms = gc_th->min_sleep_time;
35
36 set_freezable();
37 do {
38 bool sync_mode;
39
40 wait_event_interruptible_timeout(*wq,
41 kthread_should_stop() || freezing(current) ||
42 gc_th->gc_wake,
43 msecs_to_jiffies(wait_ms));
44
45 /* give it a try one time */
46 if (gc_th->gc_wake)
47 gc_th->gc_wake = 0;
48
49 if (try_to_freeze()) {
50 stat_other_skip_bggc_count(sbi);
51 continue;
52 }
53 if (kthread_should_stop())
54 break;
55
56 if (sbi->sb->s_writers.frozen >= SB_FREEZE_WRITE) {
57 increase_sleep_time(gc_th, &wait_ms);
58 stat_other_skip_bggc_count(sbi);
59 continue;
60 }
61
62 if (time_to_inject(sbi, FAULT_CHECKPOINT)) {
63 f2fs_show_injection_info(sbi, FAULT_CHECKPOINT);
64 f2fs_stop_checkpoint(sbi, false);
65 }
66
67 if (!sb_start_write_trylock(sbi->sb)) {
68 stat_other_skip_bggc_count(sbi);
69 continue;
70 }
71
72 /*
73 * [GC triggering condition]
74 * 0. GC is not conducted currently.
75 * 1. There are enough dirty segments.
76 * 2. IO subsystem is idle by checking the # of writeback pages.
77 * 3. IO subsystem is idle by checking the # of requests in
78 * bdev's request list.
79 *
80 * Note) We have to avoid triggering GCs frequently.
81 * Because it is possible that some segments can be
82 * invalidated soon after by user update or deletion.
83 * So, I'd like to wait some time to collect dirty segments.
84 */
85 if (sbi->gc_mode == GC_URGENT_HIGH) {
86 wait_ms = gc_th->urgent_sleep_time;
87 down_write(&sbi->gc_lock);
88 goto do_gc;
89 }
90
91 if (!down_write_trylock(&sbi->gc_lock)) {
92 stat_other_skip_bggc_count(sbi);
93 goto next;
94 }
95
96 if (!is_idle(sbi, GC_TIME)) {
97 increase_sleep_time(gc_th, &wait_ms);
98 up_write(&sbi->gc_lock);
99 stat_io_skip_bggc_count(sbi);
100 goto next;
101 }
102
103 if (has_enough_invalid_blocks(sbi))
104 decrease_sleep_time(gc_th, &wait_ms);
105 else
106 increase_sleep_time(gc_th, &wait_ms);
107do_gc:
108 stat_inc_bggc_count(sbi->stat_info);
109
110 sync_mode = F2FS_OPTION(sbi).bggc_mode == BGGC_MODE_SYNC;
111
112 /* if return value is not zero, no victim was selected */
113 if (f2fs_gc(sbi, sync_mode, true, NULL_SEGNO))
114 wait_ms = gc_th->no_gc_sleep_time;
115
116 trace_f2fs_background_gc(sbi->sb, wait_ms,
117 prefree_segments(sbi), free_segments(sbi));
118
119 /* balancing f2fs's metadata periodically */
120 f2fs_balance_fs_bg(sbi, true);
121next:
122 sb_end_write(sbi->sb);
123
124 } while (!kthread_should_stop());
125 return 0;
126}
127
128int f2fs_start_gc_thread(struct f2fs_sb_info *sbi)
129{
130 struct f2fs_gc_kthread *gc_th;
131 dev_t dev = sbi->sb->s_bdev->bd_dev;
132 int err = 0;
133
134 gc_th = f2fs_kmalloc(sbi, sizeof(struct f2fs_gc_kthread), GFP_KERNEL);
135 if (!gc_th) {
136 err = -ENOMEM;
137 goto out;
138 }
139
140 gc_th->urgent_sleep_time = DEF_GC_THREAD_URGENT_SLEEP_TIME;
141 gc_th->min_sleep_time = DEF_GC_THREAD_MIN_SLEEP_TIME;
142 gc_th->max_sleep_time = DEF_GC_THREAD_MAX_SLEEP_TIME;
143 gc_th->no_gc_sleep_time = DEF_GC_THREAD_NOGC_SLEEP_TIME;
144
145 gc_th->gc_wake= 0;
146
147 sbi->gc_thread = gc_th;
148 init_waitqueue_head(&sbi->gc_thread->gc_wait_queue_head);
149 sbi->gc_thread->f2fs_gc_task = kthread_run(gc_thread_func, sbi,
150 "f2fs_gc-%u:%u", MAJOR(dev), MINOR(dev));
151 if (IS_ERR(gc_th->f2fs_gc_task)) {
152 err = PTR_ERR(gc_th->f2fs_gc_task);
153 kvfree(gc_th);
154 sbi->gc_thread = NULL;
155 }
156out:
157 return err;
158}
159
160void f2fs_stop_gc_thread(struct f2fs_sb_info *sbi)
161{
162 struct f2fs_gc_kthread *gc_th = sbi->gc_thread;
163 if (!gc_th)
164 return;
165 kthread_stop(gc_th->f2fs_gc_task);
166 kvfree(gc_th);
167 sbi->gc_thread = NULL;
168}
169
170static int select_gc_type(struct f2fs_sb_info *sbi, int gc_type)
171{
172 int gc_mode = (gc_type == BG_GC) ? GC_CB : GC_GREEDY;
173
174 switch (sbi->gc_mode) {
175 case GC_IDLE_CB:
176 gc_mode = GC_CB;
177 break;
178 case GC_IDLE_GREEDY:
179 case GC_URGENT_HIGH:
180 gc_mode = GC_GREEDY;
181 break;
182 }
183 return gc_mode;
184}
185
186static void select_policy(struct f2fs_sb_info *sbi, int gc_type,
187 int type, struct victim_sel_policy *p)
188{
189 struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
190
191 if (p->alloc_mode == SSR) {
192 p->gc_mode = GC_GREEDY;
193 p->dirty_bitmap = dirty_i->dirty_segmap[type];
194 p->max_search = dirty_i->nr_dirty[type];
195 p->ofs_unit = 1;
196 } else {
197 p->gc_mode = select_gc_type(sbi, gc_type);
198 p->ofs_unit = sbi->segs_per_sec;
199 if (__is_large_section(sbi)) {
200 p->dirty_bitmap = dirty_i->dirty_secmap;
201 p->max_search = count_bits(p->dirty_bitmap,
202 0, MAIN_SECS(sbi));
203 } else {
204 p->dirty_bitmap = dirty_i->dirty_segmap[DIRTY];
205 p->max_search = dirty_i->nr_dirty[DIRTY];
206 }
207 }
208
209 /*
210 * adjust candidates range, should select all dirty segments for
211 * foreground GC and urgent GC cases.
212 */
213 if (gc_type != FG_GC &&
214 (sbi->gc_mode != GC_URGENT_HIGH) &&
215 p->max_search > sbi->max_victim_search)
216 p->max_search = sbi->max_victim_search;
217
218 /* let's select beginning hot/small space first in no_heap mode*/
219 if (test_opt(sbi, NOHEAP) &&
220 (type == CURSEG_HOT_DATA || IS_NODESEG(type)))
221 p->offset = 0;
222 else
223 p->offset = SIT_I(sbi)->last_victim[p->gc_mode];
224}
225
226static unsigned int get_max_cost(struct f2fs_sb_info *sbi,
227 struct victim_sel_policy *p)
228{
229 /* SSR allocates in a segment unit */
230 if (p->alloc_mode == SSR)
231 return sbi->blocks_per_seg;
232 if (p->gc_mode == GC_GREEDY)
233 return 2 * sbi->blocks_per_seg * p->ofs_unit;
234 else if (p->gc_mode == GC_CB)
235 return UINT_MAX;
236 else /* No other gc_mode */
237 return 0;
238}
239
240static unsigned int check_bg_victims(struct f2fs_sb_info *sbi)
241{
242 struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
243 unsigned int secno;
244
245 /*
246 * If the gc_type is FG_GC, we can select victim segments
247 * selected by background GC before.
248 * Those segments guarantee they have small valid blocks.
249 */
250 for_each_set_bit(secno, dirty_i->victim_secmap, MAIN_SECS(sbi)) {
251 if (sec_usage_check(sbi, secno))
252 continue;
253 clear_bit(secno, dirty_i->victim_secmap);
254 return GET_SEG_FROM_SEC(sbi, secno);
255 }
256 return NULL_SEGNO;
257}
258
259static unsigned int get_cb_cost(struct f2fs_sb_info *sbi, unsigned int segno)
260{
261 struct sit_info *sit_i = SIT_I(sbi);
262 unsigned int secno = GET_SEC_FROM_SEG(sbi, segno);
263 unsigned int start = GET_SEG_FROM_SEC(sbi, secno);
264 unsigned long long mtime = 0;
265 unsigned int vblocks;
266 unsigned char age = 0;
267 unsigned char u;
268 unsigned int i;
269
270 for (i = 0; i < sbi->segs_per_sec; i++)
271 mtime += get_seg_entry(sbi, start + i)->mtime;
272 vblocks = get_valid_blocks(sbi, segno, true);
273
274 mtime = div_u64(mtime, sbi->segs_per_sec);
275 vblocks = div_u64(vblocks, sbi->segs_per_sec);
276
277 u = (vblocks * 100) >> sbi->log_blocks_per_seg;
278
279 /* Handle if the system time has changed by the user */
280 if (mtime < sit_i->min_mtime)
281 sit_i->min_mtime = mtime;
282 if (mtime > sit_i->max_mtime)
283 sit_i->max_mtime = mtime;
284 if (sit_i->max_mtime != sit_i->min_mtime)
285 age = 100 - div64_u64(100 * (mtime - sit_i->min_mtime),
286 sit_i->max_mtime - sit_i->min_mtime);
287
288 return UINT_MAX - ((100 * (100 - u) * age) / (100 + u));
289}
290
291static inline unsigned int get_gc_cost(struct f2fs_sb_info *sbi,
292 unsigned int segno, struct victim_sel_policy *p)
293{
294 if (p->alloc_mode == SSR)
295 return get_seg_entry(sbi, segno)->ckpt_valid_blocks;
296
297 /* alloc_mode == LFS */
298 if (p->gc_mode == GC_GREEDY)
299 return get_valid_blocks(sbi, segno, true);
300 else
301 return get_cb_cost(sbi, segno);
302}
303
304static unsigned int count_bits(const unsigned long *addr,
305 unsigned int offset, unsigned int len)
306{
307 unsigned int end = offset + len, sum = 0;
308
309 while (offset < end) {
310 if (test_bit(offset++, addr))
311 ++sum;
312 }
313 return sum;
314}
315
316/*
317 * This function is called from two paths.
318 * One is garbage collection and the other is SSR segment selection.
319 * When it is called during GC, it just gets a victim segment
320 * and it does not remove it from dirty seglist.
321 * When it is called from SSR segment selection, it finds a segment
322 * which has minimum valid blocks and removes it from dirty seglist.
323 */
324static int get_victim_by_default(struct f2fs_sb_info *sbi,
325 unsigned int *result, int gc_type, int type, char alloc_mode)
326{
327 struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
328 struct sit_info *sm = SIT_I(sbi);
329 struct victim_sel_policy p;
330 unsigned int secno, last_victim;
331 unsigned int last_segment;
332 unsigned int nsearched = 0;
333 int ret = 0;
334
335 mutex_lock(&dirty_i->seglist_lock);
336 last_segment = MAIN_SECS(sbi) * sbi->segs_per_sec;
337
338 p.alloc_mode = alloc_mode;
339 select_policy(sbi, gc_type, type, &p);
340
341 p.min_segno = NULL_SEGNO;
342 p.min_cost = get_max_cost(sbi, &p);
343
344 if (*result != NULL_SEGNO) {
345 if (!get_valid_blocks(sbi, *result, false)) {
346 ret = -ENODATA;
347 goto out;
348 }
349
350 if (sec_usage_check(sbi, GET_SEC_FROM_SEG(sbi, *result)))
351 ret = -EBUSY;
352 else
353 p.min_segno = *result;
354 goto out;
355 }
356
357 ret = -ENODATA;
358 if (p.max_search == 0)
359 goto out;
360
361 if (__is_large_section(sbi) && p.alloc_mode == LFS) {
362 if (sbi->next_victim_seg[BG_GC] != NULL_SEGNO) {
363 p.min_segno = sbi->next_victim_seg[BG_GC];
364 *result = p.min_segno;
365 sbi->next_victim_seg[BG_GC] = NULL_SEGNO;
366 goto got_result;
367 }
368 if (gc_type == FG_GC &&
369 sbi->next_victim_seg[FG_GC] != NULL_SEGNO) {
370 p.min_segno = sbi->next_victim_seg[FG_GC];
371 *result = p.min_segno;
372 sbi->next_victim_seg[FG_GC] = NULL_SEGNO;
373 goto got_result;
374 }
375 }
376
377 last_victim = sm->last_victim[p.gc_mode];
378 if (p.alloc_mode == LFS && gc_type == FG_GC) {
379 p.min_segno = check_bg_victims(sbi);
380 if (p.min_segno != NULL_SEGNO)
381 goto got_it;
382 }
383
384 while (1) {
385 unsigned long cost, *dirty_bitmap;
386 unsigned int unit_no, segno;
387
388 dirty_bitmap = p.dirty_bitmap;
389 unit_no = find_next_bit(dirty_bitmap,
390 last_segment / p.ofs_unit,
391 p.offset / p.ofs_unit);
392 segno = unit_no * p.ofs_unit;
393 if (segno >= last_segment) {
394 if (sm->last_victim[p.gc_mode]) {
395 last_segment =
396 sm->last_victim[p.gc_mode];
397 sm->last_victim[p.gc_mode] = 0;
398 p.offset = 0;
399 continue;
400 }
401 break;
402 }
403
404 p.offset = segno + p.ofs_unit;
405 nsearched++;
406
407#ifdef CONFIG_F2FS_CHECK_FS
408 /*
409 * skip selecting the invalid segno (that is failed due to block
410 * validity check failure during GC) to avoid endless GC loop in
411 * such cases.
412 */
413 if (test_bit(segno, sm->invalid_segmap))
414 goto next;
415#endif
416
417 secno = GET_SEC_FROM_SEG(sbi, segno);
418
419 if (sec_usage_check(sbi, secno))
420 goto next;
421 /* Don't touch checkpointed data */
422 if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED) &&
423 get_ckpt_valid_blocks(sbi, segno) &&
424 p.alloc_mode != SSR))
425 goto next;
426 if (gc_type == BG_GC && test_bit(secno, dirty_i->victim_secmap))
427 goto next;
428
429 cost = get_gc_cost(sbi, segno, &p);
430
431 if (p.min_cost > cost) {
432 p.min_segno = segno;
433 p.min_cost = cost;
434 }
435next:
436 if (nsearched >= p.max_search) {
437 if (!sm->last_victim[p.gc_mode] && segno <= last_victim)
438 sm->last_victim[p.gc_mode] =
439 last_victim + p.ofs_unit;
440 else
441 sm->last_victim[p.gc_mode] = segno + p.ofs_unit;
442 sm->last_victim[p.gc_mode] %=
443 (MAIN_SECS(sbi) * sbi->segs_per_sec);
444 break;
445 }
446 }
447 if (p.min_segno != NULL_SEGNO) {
448got_it:
449 *result = (p.min_segno / p.ofs_unit) * p.ofs_unit;
450got_result:
451 if (p.alloc_mode == LFS) {
452 secno = GET_SEC_FROM_SEG(sbi, p.min_segno);
453 if (gc_type == FG_GC)
454 sbi->cur_victim_sec = secno;
455 else
456 set_bit(secno, dirty_i->victim_secmap);
457 }
458 ret = 0;
459
460 }
461out:
462 if (p.min_segno != NULL_SEGNO)
463 trace_f2fs_get_victim(sbi->sb, type, gc_type, &p,
464 sbi->cur_victim_sec,
465 prefree_segments(sbi), free_segments(sbi));
466 mutex_unlock(&dirty_i->seglist_lock);
467
468 return ret;
469}
470
471static const struct victim_selection default_v_ops = {
472 .get_victim = get_victim_by_default,
473};
474
475static struct inode *find_gc_inode(struct gc_inode_list *gc_list, nid_t ino)
476{
477 struct inode_entry *ie;
478
479 ie = radix_tree_lookup(&gc_list->iroot, ino);
480 if (ie)
481 return ie->inode;
482 return NULL;
483}
484
485static void add_gc_inode(struct gc_inode_list *gc_list, struct inode *inode)
486{
487 struct inode_entry *new_ie;
488
489 if (inode == find_gc_inode(gc_list, inode->i_ino)) {
490 iput(inode);
491 return;
492 }
493 new_ie = f2fs_kmem_cache_alloc(f2fs_inode_entry_slab, GFP_NOFS);
494 new_ie->inode = inode;
495
496 f2fs_radix_tree_insert(&gc_list->iroot, inode->i_ino, new_ie);
497 list_add_tail(&new_ie->list, &gc_list->ilist);
498}
499
500static void put_gc_inode(struct gc_inode_list *gc_list)
501{
502 struct inode_entry *ie, *next_ie;
503 list_for_each_entry_safe(ie, next_ie, &gc_list->ilist, list) {
504 radix_tree_delete(&gc_list->iroot, ie->inode->i_ino);
505 iput(ie->inode);
506 list_del(&ie->list);
507 kmem_cache_free(f2fs_inode_entry_slab, ie);
508 }
509}
510
511static int check_valid_map(struct f2fs_sb_info *sbi,
512 unsigned int segno, int offset)
513{
514 struct sit_info *sit_i = SIT_I(sbi);
515 struct seg_entry *sentry;
516 int ret;
517
518 down_read(&sit_i->sentry_lock);
519 sentry = get_seg_entry(sbi, segno);
520 ret = f2fs_test_bit(offset, sentry->cur_valid_map);
521 up_read(&sit_i->sentry_lock);
522 return ret;
523}
524
525/*
526 * This function compares node address got in summary with that in NAT.
527 * On validity, copy that node with cold status, otherwise (invalid node)
528 * ignore that.
529 */
530static int gc_node_segment(struct f2fs_sb_info *sbi,
531 struct f2fs_summary *sum, unsigned int segno, int gc_type)
532{
533 struct f2fs_summary *entry;
534 block_t start_addr;
535 int off;
536 int phase = 0;
537 bool fggc = (gc_type == FG_GC);
538 int submitted = 0;
539
540 start_addr = START_BLOCK(sbi, segno);
541
542next_step:
543 entry = sum;
544
545 if (fggc && phase == 2)
546 atomic_inc(&sbi->wb_sync_req[NODE]);
547
548 for (off = 0; off < sbi->blocks_per_seg; off++, entry++) {
549 nid_t nid = le32_to_cpu(entry->nid);
550 struct page *node_page;
551 struct node_info ni;
552 int err;
553
554 /* stop BG_GC if there is not enough free sections. */
555 if (gc_type == BG_GC && has_not_enough_free_secs(sbi, 0, 0))
556 return submitted;
557
558 if (check_valid_map(sbi, segno, off) == 0)
559 continue;
560
561 if (phase == 0) {
562 f2fs_ra_meta_pages(sbi, NAT_BLOCK_OFFSET(nid), 1,
563 META_NAT, true);
564 continue;
565 }
566
567 if (phase == 1) {
568 f2fs_ra_node_page(sbi, nid);
569 continue;
570 }
571
572 /* phase == 2 */
573 node_page = f2fs_get_node_page(sbi, nid);
574 if (IS_ERR(node_page))
575 continue;
576
577 /* block may become invalid during f2fs_get_node_page */
578 if (check_valid_map(sbi, segno, off) == 0) {
579 f2fs_put_page(node_page, 1);
580 continue;
581 }
582
583 if (f2fs_get_node_info(sbi, nid, &ni)) {
584 f2fs_put_page(node_page, 1);
585 continue;
586 }
587
588 if (ni.blk_addr != start_addr + off) {
589 f2fs_put_page(node_page, 1);
590 continue;
591 }
592
593 err = f2fs_move_node_page(node_page, gc_type);
594 if (!err && gc_type == FG_GC)
595 submitted++;
596 stat_inc_node_blk_count(sbi, 1, gc_type);
597 }
598
599 if (++phase < 3)
600 goto next_step;
601
602 if (fggc)
603 atomic_dec(&sbi->wb_sync_req[NODE]);
604 return submitted;
605}
606
607/*
608 * Calculate start block index indicating the given node offset.
609 * Be careful, caller should give this node offset only indicating direct node
610 * blocks. If any node offsets, which point the other types of node blocks such
611 * as indirect or double indirect node blocks, are given, it must be a caller's
612 * bug.
613 */
614block_t f2fs_start_bidx_of_node(unsigned int node_ofs, struct inode *inode)
615{
616 unsigned int indirect_blks = 2 * NIDS_PER_BLOCK + 4;
617 unsigned int bidx;
618
619 if (node_ofs == 0)
620 return 0;
621
622 if (node_ofs <= 2) {
623 bidx = node_ofs - 1;
624 } else if (node_ofs <= indirect_blks) {
625 int dec = (node_ofs - 4) / (NIDS_PER_BLOCK + 1);
626 bidx = node_ofs - 2 - dec;
627 } else {
628 int dec = (node_ofs - indirect_blks - 3) / (NIDS_PER_BLOCK + 1);
629 bidx = node_ofs - 5 - dec;
630 }
631 return bidx * ADDRS_PER_BLOCK(inode) + ADDRS_PER_INODE(inode);
632}
633
634static bool is_alive(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
635 struct node_info *dni, block_t blkaddr, unsigned int *nofs)
636{
637 struct page *node_page;
638 nid_t nid;
639 unsigned int ofs_in_node;
640 block_t source_blkaddr;
641
642 nid = le32_to_cpu(sum->nid);
643 ofs_in_node = le16_to_cpu(sum->ofs_in_node);
644
645 node_page = f2fs_get_node_page(sbi, nid);
646 if (IS_ERR(node_page))
647 return false;
648
649 if (f2fs_get_node_info(sbi, nid, dni)) {
650 f2fs_put_page(node_page, 1);
651 return false;
652 }
653
654 if (sum->version != dni->version) {
655 f2fs_warn(sbi, "%s: valid data with mismatched node version.",
656 __func__);
657 set_sbi_flag(sbi, SBI_NEED_FSCK);
658 }
659
660 *nofs = ofs_of_node(node_page);
661 source_blkaddr = data_blkaddr(NULL, node_page, ofs_in_node);
662 f2fs_put_page(node_page, 1);
663
664 if (source_blkaddr != blkaddr) {
665#ifdef CONFIG_F2FS_CHECK_FS
666 unsigned int segno = GET_SEGNO(sbi, blkaddr);
667 unsigned long offset = GET_BLKOFF_FROM_SEG0(sbi, blkaddr);
668
669 if (unlikely(check_valid_map(sbi, segno, offset))) {
670 if (!test_and_set_bit(segno, SIT_I(sbi)->invalid_segmap)) {
671 f2fs_err(sbi, "mismatched blkaddr %u (source_blkaddr %u) in seg %u\n",
672 blkaddr, source_blkaddr, segno);
673 f2fs_bug_on(sbi, 1);
674 }
675 }
676#endif
677 return false;
678 }
679 return true;
680}
681
682static int ra_data_block(struct inode *inode, pgoff_t index)
683{
684 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
685 struct address_space *mapping = inode->i_mapping;
686 struct dnode_of_data dn;
687 struct page *page;
688 struct extent_info ei = {0, 0, 0};
689 struct f2fs_io_info fio = {
690 .sbi = sbi,
691 .ino = inode->i_ino,
692 .type = DATA,
693 .temp = COLD,
694 .op = REQ_OP_READ,
695 .op_flags = 0,
696 .encrypted_page = NULL,
697 .in_list = false,
698 .retry = false,
699 };
700 int err;
701
702 page = f2fs_grab_cache_page(mapping, index, true);
703 if (!page)
704 return -ENOMEM;
705
706 if (f2fs_lookup_extent_cache(inode, index, &ei)) {
707 dn.data_blkaddr = ei.blk + index - ei.fofs;
708 if (unlikely(!f2fs_is_valid_blkaddr(sbi, dn.data_blkaddr,
709 DATA_GENERIC_ENHANCE_READ))) {
710 err = -EFSCORRUPTED;
711 goto put_page;
712 }
713 goto got_it;
714 }
715
716 set_new_dnode(&dn, inode, NULL, NULL, 0);
717 err = f2fs_get_dnode_of_data(&dn, index, LOOKUP_NODE);
718 if (err)
719 goto put_page;
720 f2fs_put_dnode(&dn);
721
722 if (!__is_valid_data_blkaddr(dn.data_blkaddr)) {
723 err = -ENOENT;
724 goto put_page;
725 }
726 if (unlikely(!f2fs_is_valid_blkaddr(sbi, dn.data_blkaddr,
727 DATA_GENERIC_ENHANCE))) {
728 err = -EFSCORRUPTED;
729 goto put_page;
730 }
731got_it:
732 /* read page */
733 fio.page = page;
734 fio.new_blkaddr = fio.old_blkaddr = dn.data_blkaddr;
735
736 /*
737 * don't cache encrypted data into meta inode until previous dirty
738 * data were writebacked to avoid racing between GC and flush.
739 */
740 f2fs_wait_on_page_writeback(page, DATA, true, true);
741
742 f2fs_wait_on_block_writeback(inode, dn.data_blkaddr);
743
744 fio.encrypted_page = f2fs_pagecache_get_page(META_MAPPING(sbi),
745 dn.data_blkaddr,
746 FGP_LOCK | FGP_CREAT, GFP_NOFS);
747 if (!fio.encrypted_page) {
748 err = -ENOMEM;
749 goto put_page;
750 }
751
752 err = f2fs_submit_page_bio(&fio);
753 if (err)
754 goto put_encrypted_page;
755 f2fs_put_page(fio.encrypted_page, 0);
756 f2fs_put_page(page, 1);
757
758 f2fs_update_iostat(sbi, FS_DATA_READ_IO, F2FS_BLKSIZE);
759 f2fs_update_iostat(sbi, FS_GDATA_READ_IO, F2FS_BLKSIZE);
760
761 return 0;
762put_encrypted_page:
763 f2fs_put_page(fio.encrypted_page, 1);
764put_page:
765 f2fs_put_page(page, 1);
766 return err;
767}
768
769/*
770 * Move data block via META_MAPPING while keeping locked data page.
771 * This can be used to move blocks, aka LBAs, directly on disk.
772 */
773static int move_data_block(struct inode *inode, block_t bidx,
774 int gc_type, unsigned int segno, int off)
775{
776 struct f2fs_io_info fio = {
777 .sbi = F2FS_I_SB(inode),
778 .ino = inode->i_ino,
779 .type = DATA,
780 .temp = COLD,
781 .op = REQ_OP_READ,
782 .op_flags = 0,
783 .encrypted_page = NULL,
784 .in_list = false,
785 .retry = false,
786 };
787 struct dnode_of_data dn;
788 struct f2fs_summary sum;
789 struct node_info ni;
790 struct page *page, *mpage;
791 block_t newaddr;
792 int err = 0;
793 bool lfs_mode = f2fs_lfs_mode(fio.sbi);
794
795 /* do not read out */
796 page = f2fs_grab_cache_page(inode->i_mapping, bidx, false);
797 if (!page)
798 return -ENOMEM;
799
800 if (!check_valid_map(F2FS_I_SB(inode), segno, off)) {
801 err = -ENOENT;
802 goto out;
803 }
804
805 if (f2fs_is_atomic_file(inode)) {
806 F2FS_I(inode)->i_gc_failures[GC_FAILURE_ATOMIC]++;
807 F2FS_I_SB(inode)->skipped_atomic_files[gc_type]++;
808 err = -EAGAIN;
809 goto out;
810 }
811
812 if (f2fs_is_pinned_file(inode)) {
813 f2fs_pin_file_control(inode, true);
814 err = -EAGAIN;
815 goto out;
816 }
817
818 set_new_dnode(&dn, inode, NULL, NULL, 0);
819 err = f2fs_get_dnode_of_data(&dn, bidx, LOOKUP_NODE);
820 if (err)
821 goto out;
822
823 if (unlikely(dn.data_blkaddr == NULL_ADDR)) {
824 ClearPageUptodate(page);
825 err = -ENOENT;
826 goto put_out;
827 }
828
829 /*
830 * don't cache encrypted data into meta inode until previous dirty
831 * data were writebacked to avoid racing between GC and flush.
832 */
833 f2fs_wait_on_page_writeback(page, DATA, true, true);
834
835 f2fs_wait_on_block_writeback(inode, dn.data_blkaddr);
836
837 err = f2fs_get_node_info(fio.sbi, dn.nid, &ni);
838 if (err)
839 goto put_out;
840
841 set_summary(&sum, dn.nid, dn.ofs_in_node, ni.version);
842
843 /* read page */
844 fio.page = page;
845 fio.new_blkaddr = fio.old_blkaddr = dn.data_blkaddr;
846
847 if (lfs_mode)
848 down_write(&fio.sbi->io_order_lock);
849
850 mpage = f2fs_grab_cache_page(META_MAPPING(fio.sbi),
851 fio.old_blkaddr, false);
852 if (!mpage) {
853 err = -ENOMEM;
854 goto up_out;
855 }
856
857 fio.encrypted_page = mpage;
858
859 /* read source block in mpage */
860 if (!PageUptodate(mpage)) {
861 err = f2fs_submit_page_bio(&fio);
862 if (err) {
863 f2fs_put_page(mpage, 1);
864 goto up_out;
865 }
866
867 f2fs_update_iostat(fio.sbi, FS_DATA_READ_IO, F2FS_BLKSIZE);
868 f2fs_update_iostat(fio.sbi, FS_GDATA_READ_IO, F2FS_BLKSIZE);
869
870 lock_page(mpage);
871 if (unlikely(mpage->mapping != META_MAPPING(fio.sbi) ||
872 !PageUptodate(mpage))) {
873 err = -EIO;
874 f2fs_put_page(mpage, 1);
875 goto up_out;
876 }
877 }
878
879 f2fs_allocate_data_block(fio.sbi, NULL, fio.old_blkaddr, &newaddr,
880 &sum, CURSEG_COLD_DATA, NULL);
881
882 fio.encrypted_page = f2fs_pagecache_get_page(META_MAPPING(fio.sbi),
883 newaddr, FGP_LOCK | FGP_CREAT, GFP_NOFS);
884 if (!fio.encrypted_page) {
885 err = -ENOMEM;
886 f2fs_put_page(mpage, 1);
887 goto recover_block;
888 }
889
890 /* write target block */
891 f2fs_wait_on_page_writeback(fio.encrypted_page, DATA, true, true);
892 memcpy(page_address(fio.encrypted_page),
893 page_address(mpage), PAGE_SIZE);
894 f2fs_put_page(mpage, 1);
895 invalidate_mapping_pages(META_MAPPING(fio.sbi),
896 fio.old_blkaddr, fio.old_blkaddr);
897
898 set_page_dirty(fio.encrypted_page);
899 if (clear_page_dirty_for_io(fio.encrypted_page))
900 dec_page_count(fio.sbi, F2FS_DIRTY_META);
901
902 set_page_writeback(fio.encrypted_page);
903 ClearPageError(page);
904
905 /* allocate block address */
906 f2fs_wait_on_page_writeback(dn.node_page, NODE, true, true);
907
908 fio.op = REQ_OP_WRITE;
909 fio.op_flags = REQ_SYNC;
910 fio.new_blkaddr = newaddr;
911 f2fs_submit_page_write(&fio);
912 if (fio.retry) {
913 err = -EAGAIN;
914 if (PageWriteback(fio.encrypted_page))
915 end_page_writeback(fio.encrypted_page);
916 goto put_page_out;
917 }
918
919 f2fs_update_iostat(fio.sbi, FS_GC_DATA_IO, F2FS_BLKSIZE);
920
921 f2fs_update_data_blkaddr(&dn, newaddr);
922 set_inode_flag(inode, FI_APPEND_WRITE);
923 if (page->index == 0)
924 set_inode_flag(inode, FI_FIRST_BLOCK_WRITTEN);
925put_page_out:
926 f2fs_put_page(fio.encrypted_page, 1);
927recover_block:
928 if (err)
929 f2fs_do_replace_block(fio.sbi, &sum, newaddr, fio.old_blkaddr,
930 true, true);
931up_out:
932 if (lfs_mode)
933 up_write(&fio.sbi->io_order_lock);
934put_out:
935 f2fs_put_dnode(&dn);
936out:
937 f2fs_put_page(page, 1);
938 return err;
939}
940
941static int move_data_page(struct inode *inode, block_t bidx, int gc_type,
942 unsigned int segno, int off)
943{
944 struct page *page;
945 int err = 0;
946
947 page = f2fs_get_lock_data_page(inode, bidx, true);
948 if (IS_ERR(page))
949 return PTR_ERR(page);
950
951 if (!check_valid_map(F2FS_I_SB(inode), segno, off)) {
952 err = -ENOENT;
953 goto out;
954 }
955
956 if (f2fs_is_atomic_file(inode)) {
957 F2FS_I(inode)->i_gc_failures[GC_FAILURE_ATOMIC]++;
958 F2FS_I_SB(inode)->skipped_atomic_files[gc_type]++;
959 err = -EAGAIN;
960 goto out;
961 }
962 if (f2fs_is_pinned_file(inode)) {
963 if (gc_type == FG_GC)
964 f2fs_pin_file_control(inode, true);
965 err = -EAGAIN;
966 goto out;
967 }
968
969 if (gc_type == BG_GC) {
970 if (PageWriteback(page)) {
971 err = -EAGAIN;
972 goto out;
973 }
974 set_page_dirty(page);
975 set_cold_data(page);
976 } else {
977 struct f2fs_io_info fio = {
978 .sbi = F2FS_I_SB(inode),
979 .ino = inode->i_ino,
980 .type = DATA,
981 .temp = COLD,
982 .op = REQ_OP_WRITE,
983 .op_flags = REQ_SYNC,
984 .old_blkaddr = NULL_ADDR,
985 .page = page,
986 .encrypted_page = NULL,
987 .need_lock = LOCK_REQ,
988 .io_type = FS_GC_DATA_IO,
989 };
990 bool is_dirty = PageDirty(page);
991
992retry:
993 f2fs_wait_on_page_writeback(page, DATA, true, true);
994
995 set_page_dirty(page);
996 if (clear_page_dirty_for_io(page)) {
997 inode_dec_dirty_pages(inode);
998 f2fs_remove_dirty_inode(inode);
999 }
1000
1001 set_cold_data(page);
1002
1003 err = f2fs_do_write_data_page(&fio);
1004 if (err) {
1005 clear_cold_data(page);
1006 if (err == -ENOMEM) {
1007 congestion_wait(BLK_RW_ASYNC,
1008 DEFAULT_IO_TIMEOUT);
1009 goto retry;
1010 }
1011 if (is_dirty)
1012 set_page_dirty(page);
1013 }
1014 }
1015out:
1016 f2fs_put_page(page, 1);
1017 return err;
1018}
1019
1020/*
1021 * This function tries to get parent node of victim data block, and identifies
1022 * data block validity. If the block is valid, copy that with cold status and
1023 * modify parent node.
1024 * If the parent node is not valid or the data block address is different,
1025 * the victim data block is ignored.
1026 */
1027static int gc_data_segment(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
1028 struct gc_inode_list *gc_list, unsigned int segno, int gc_type)
1029{
1030 struct super_block *sb = sbi->sb;
1031 struct f2fs_summary *entry;
1032 block_t start_addr;
1033 int off;
1034 int phase = 0;
1035 int submitted = 0;
1036
1037 start_addr = START_BLOCK(sbi, segno);
1038
1039next_step:
1040 entry = sum;
1041
1042 for (off = 0; off < sbi->blocks_per_seg; off++, entry++) {
1043 struct page *data_page;
1044 struct inode *inode;
1045 struct node_info dni; /* dnode info for the data */
1046 unsigned int ofs_in_node, nofs;
1047 block_t start_bidx;
1048 nid_t nid = le32_to_cpu(entry->nid);
1049
1050 /*
1051 * stop BG_GC if there is not enough free sections.
1052 * Or, stop GC if the segment becomes fully valid caused by
1053 * race condition along with SSR block allocation.
1054 */
1055 if ((gc_type == BG_GC && has_not_enough_free_secs(sbi, 0, 0)) ||
1056 get_valid_blocks(sbi, segno, true) ==
1057 BLKS_PER_SEC(sbi))
1058 return submitted;
1059
1060 if (check_valid_map(sbi, segno, off) == 0)
1061 continue;
1062
1063 if (phase == 0) {
1064 f2fs_ra_meta_pages(sbi, NAT_BLOCK_OFFSET(nid), 1,
1065 META_NAT, true);
1066 continue;
1067 }
1068
1069 if (phase == 1) {
1070 f2fs_ra_node_page(sbi, nid);
1071 continue;
1072 }
1073
1074 /* Get an inode by ino with checking validity */
1075 if (!is_alive(sbi, entry, &dni, start_addr + off, &nofs))
1076 continue;
1077
1078 if (phase == 2) {
1079 f2fs_ra_node_page(sbi, dni.ino);
1080 continue;
1081 }
1082
1083 ofs_in_node = le16_to_cpu(entry->ofs_in_node);
1084
1085 if (phase == 3) {
1086 inode = f2fs_iget(sb, dni.ino);
1087 if (IS_ERR(inode) || is_bad_inode(inode)) {
1088 set_sbi_flag(sbi, SBI_NEED_FSCK);
1089 continue;
1090 }
1091
1092 if (!down_write_trylock(
1093 &F2FS_I(inode)->i_gc_rwsem[WRITE])) {
1094 iput(inode);
1095 sbi->skipped_gc_rwsem++;
1096 continue;
1097 }
1098
1099 start_bidx = f2fs_start_bidx_of_node(nofs, inode) +
1100 ofs_in_node;
1101
1102 if (f2fs_post_read_required(inode)) {
1103 int err = ra_data_block(inode, start_bidx);
1104
1105 up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
1106 if (err) {
1107 iput(inode);
1108 continue;
1109 }
1110 add_gc_inode(gc_list, inode);
1111 continue;
1112 }
1113
1114 data_page = f2fs_get_read_data_page(inode,
1115 start_bidx, REQ_RAHEAD, true);
1116 up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
1117 if (IS_ERR(data_page)) {
1118 iput(inode);
1119 continue;
1120 }
1121
1122 f2fs_put_page(data_page, 0);
1123 add_gc_inode(gc_list, inode);
1124 continue;
1125 }
1126
1127 /* phase 4 */
1128 inode = find_gc_inode(gc_list, dni.ino);
1129 if (inode) {
1130 struct f2fs_inode_info *fi = F2FS_I(inode);
1131 bool locked = false;
1132 int err;
1133
1134 if (S_ISREG(inode->i_mode)) {
1135 if (!down_write_trylock(&fi->i_gc_rwsem[READ]))
1136 continue;
1137 if (!down_write_trylock(
1138 &fi->i_gc_rwsem[WRITE])) {
1139 sbi->skipped_gc_rwsem++;
1140 up_write(&fi->i_gc_rwsem[READ]);
1141 continue;
1142 }
1143 locked = true;
1144
1145 /* wait for all inflight aio data */
1146 inode_dio_wait(inode);
1147 }
1148
1149 start_bidx = f2fs_start_bidx_of_node(nofs, inode)
1150 + ofs_in_node;
1151 if (f2fs_post_read_required(inode))
1152 err = move_data_block(inode, start_bidx,
1153 gc_type, segno, off);
1154 else
1155 err = move_data_page(inode, start_bidx, gc_type,
1156 segno, off);
1157
1158 if (!err && (gc_type == FG_GC ||
1159 f2fs_post_read_required(inode)))
1160 submitted++;
1161
1162 if (locked) {
1163 up_write(&fi->i_gc_rwsem[WRITE]);
1164 up_write(&fi->i_gc_rwsem[READ]);
1165 }
1166
1167 stat_inc_data_blk_count(sbi, 1, gc_type);
1168 }
1169 }
1170
1171 if (++phase < 5)
1172 goto next_step;
1173
1174 return submitted;
1175}
1176
1177static int __get_victim(struct f2fs_sb_info *sbi, unsigned int *victim,
1178 int gc_type)
1179{
1180 struct sit_info *sit_i = SIT_I(sbi);
1181 int ret;
1182
1183 down_write(&sit_i->sentry_lock);
1184 ret = DIRTY_I(sbi)->v_ops->get_victim(sbi, victim, gc_type,
1185 NO_CHECK_TYPE, LFS);
1186 up_write(&sit_i->sentry_lock);
1187 return ret;
1188}
1189
1190static int do_garbage_collect(struct f2fs_sb_info *sbi,
1191 unsigned int start_segno,
1192 struct gc_inode_list *gc_list, int gc_type)
1193{
1194 struct page *sum_page;
1195 struct f2fs_summary_block *sum;
1196 struct blk_plug plug;
1197 unsigned int segno = start_segno;
1198 unsigned int end_segno = start_segno + sbi->segs_per_sec;
1199 int seg_freed = 0, migrated = 0;
1200 unsigned char type = IS_DATASEG(get_seg_entry(sbi, segno)->type) ?
1201 SUM_TYPE_DATA : SUM_TYPE_NODE;
1202 int submitted = 0;
1203
1204 if (__is_large_section(sbi))
1205 end_segno = rounddown(end_segno, sbi->segs_per_sec);
1206
1207 /* readahead multi ssa blocks those have contiguous address */
1208 if (__is_large_section(sbi))
1209 f2fs_ra_meta_pages(sbi, GET_SUM_BLOCK(sbi, segno),
1210 end_segno - segno, META_SSA, true);
1211
1212 /* reference all summary page */
1213 while (segno < end_segno) {
1214 sum_page = f2fs_get_sum_page(sbi, segno++);
1215 if (IS_ERR(sum_page)) {
1216 int err = PTR_ERR(sum_page);
1217
1218 end_segno = segno - 1;
1219 for (segno = start_segno; segno < end_segno; segno++) {
1220 sum_page = find_get_page(META_MAPPING(sbi),
1221 GET_SUM_BLOCK(sbi, segno));
1222 f2fs_put_page(sum_page, 0);
1223 f2fs_put_page(sum_page, 0);
1224 }
1225 return err;
1226 }
1227 unlock_page(sum_page);
1228 }
1229
1230 blk_start_plug(&plug);
1231
1232 for (segno = start_segno; segno < end_segno; segno++) {
1233
1234 /* find segment summary of victim */
1235 sum_page = find_get_page(META_MAPPING(sbi),
1236 GET_SUM_BLOCK(sbi, segno));
1237 f2fs_put_page(sum_page, 0);
1238
1239 if (get_valid_blocks(sbi, segno, false) == 0)
1240 goto freed;
1241 if (gc_type == BG_GC && __is_large_section(sbi) &&
1242 migrated >= sbi->migration_granularity)
1243 goto skip;
1244 if (!PageUptodate(sum_page) || unlikely(f2fs_cp_error(sbi)))
1245 goto skip;
1246
1247 sum = page_address(sum_page);
1248 if (type != GET_SUM_TYPE((&sum->footer))) {
1249 f2fs_err(sbi, "Inconsistent segment (%u) type [%d, %d] in SSA and SIT",
1250 segno, type, GET_SUM_TYPE((&sum->footer)));
1251 set_sbi_flag(sbi, SBI_NEED_FSCK);
1252 f2fs_stop_checkpoint(sbi, false);
1253 goto skip;
1254 }
1255
1256 /*
1257 * this is to avoid deadlock:
1258 * - lock_page(sum_page) - f2fs_replace_block
1259 * - check_valid_map() - down_write(sentry_lock)
1260 * - down_read(sentry_lock) - change_curseg()
1261 * - lock_page(sum_page)
1262 */
1263 if (type == SUM_TYPE_NODE)
1264 submitted += gc_node_segment(sbi, sum->entries, segno,
1265 gc_type);
1266 else
1267 submitted += gc_data_segment(sbi, sum->entries, gc_list,
1268 segno, gc_type);
1269
1270 stat_inc_seg_count(sbi, type, gc_type);
1271 migrated++;
1272
1273freed:
1274 if (gc_type == FG_GC &&
1275 get_valid_blocks(sbi, segno, false) == 0)
1276 seg_freed++;
1277
1278 if (__is_large_section(sbi) && segno + 1 < end_segno)
1279 sbi->next_victim_seg[gc_type] = segno + 1;
1280skip:
1281 f2fs_put_page(sum_page, 0);
1282 }
1283
1284 if (submitted)
1285 f2fs_submit_merged_write(sbi,
1286 (type == SUM_TYPE_NODE) ? NODE : DATA);
1287
1288 blk_finish_plug(&plug);
1289
1290 stat_inc_call_count(sbi->stat_info);
1291
1292 return seg_freed;
1293}
1294
1295int f2fs_gc(struct f2fs_sb_info *sbi, bool sync,
1296 bool background, unsigned int segno)
1297{
1298 int gc_type = sync ? FG_GC : BG_GC;
1299 int sec_freed = 0, seg_freed = 0, total_freed = 0;
1300 int ret = 0;
1301 struct cp_control cpc;
1302 unsigned int init_segno = segno;
1303 struct gc_inode_list gc_list = {
1304 .ilist = LIST_HEAD_INIT(gc_list.ilist),
1305 .iroot = RADIX_TREE_INIT(gc_list.iroot, GFP_NOFS),
1306 };
1307 unsigned long long last_skipped = sbi->skipped_atomic_files[FG_GC];
1308 unsigned long long first_skipped;
1309 unsigned int skipped_round = 0, round = 0;
1310
1311 trace_f2fs_gc_begin(sbi->sb, sync, background,
1312 get_pages(sbi, F2FS_DIRTY_NODES),
1313 get_pages(sbi, F2FS_DIRTY_DENTS),
1314 get_pages(sbi, F2FS_DIRTY_IMETA),
1315 free_sections(sbi),
1316 free_segments(sbi),
1317 reserved_segments(sbi),
1318 prefree_segments(sbi));
1319
1320 cpc.reason = __get_cp_reason(sbi);
1321 sbi->skipped_gc_rwsem = 0;
1322 first_skipped = last_skipped;
1323gc_more:
1324 if (unlikely(!(sbi->sb->s_flags & SB_ACTIVE))) {
1325 ret = -EINVAL;
1326 goto stop;
1327 }
1328 if (unlikely(f2fs_cp_error(sbi))) {
1329 ret = -EIO;
1330 goto stop;
1331 }
1332
1333 if (gc_type == BG_GC && has_not_enough_free_secs(sbi, 0, 0)) {
1334 /*
1335 * For example, if there are many prefree_segments below given
1336 * threshold, we can make them free by checkpoint. Then, we
1337 * secure free segments which doesn't need fggc any more.
1338 */
1339 if (prefree_segments(sbi) &&
1340 !is_sbi_flag_set(sbi, SBI_CP_DISABLED)) {
1341 ret = f2fs_write_checkpoint(sbi, &cpc);
1342 if (ret)
1343 goto stop;
1344 }
1345 if (has_not_enough_free_secs(sbi, 0, 0))
1346 gc_type = FG_GC;
1347 }
1348
1349 /* f2fs_balance_fs doesn't need to do BG_GC in critical path. */
1350 if (gc_type == BG_GC && !background) {
1351 ret = -EINVAL;
1352 goto stop;
1353 }
1354 ret = __get_victim(sbi, &segno, gc_type);
1355 if (ret)
1356 goto stop;
1357
1358 seg_freed = do_garbage_collect(sbi, segno, &gc_list, gc_type);
1359 if (gc_type == FG_GC && seg_freed == sbi->segs_per_sec)
1360 sec_freed++;
1361 total_freed += seg_freed;
1362
1363 if (gc_type == FG_GC) {
1364 if (sbi->skipped_atomic_files[FG_GC] > last_skipped ||
1365 sbi->skipped_gc_rwsem)
1366 skipped_round++;
1367 last_skipped = sbi->skipped_atomic_files[FG_GC];
1368 round++;
1369 }
1370
1371 if (gc_type == FG_GC && seg_freed)
1372 sbi->cur_victim_sec = NULL_SEGNO;
1373
1374 if (sync)
1375 goto stop;
1376
1377 if (has_not_enough_free_secs(sbi, sec_freed, 0)) {
1378 if (skipped_round <= MAX_SKIP_GC_COUNT ||
1379 skipped_round * 2 < round) {
1380 segno = NULL_SEGNO;
1381 goto gc_more;
1382 }
1383
1384 if (first_skipped < last_skipped &&
1385 (last_skipped - first_skipped) >
1386 sbi->skipped_gc_rwsem) {
1387 f2fs_drop_inmem_pages_all(sbi, true);
1388 segno = NULL_SEGNO;
1389 goto gc_more;
1390 }
1391 if (gc_type == FG_GC && !is_sbi_flag_set(sbi, SBI_CP_DISABLED))
1392 ret = f2fs_write_checkpoint(sbi, &cpc);
1393 }
1394stop:
1395 SIT_I(sbi)->last_victim[ALLOC_NEXT] = 0;
1396 SIT_I(sbi)->last_victim[FLUSH_DEVICE] = init_segno;
1397
1398 trace_f2fs_gc_end(sbi->sb, ret, total_freed, sec_freed,
1399 get_pages(sbi, F2FS_DIRTY_NODES),
1400 get_pages(sbi, F2FS_DIRTY_DENTS),
1401 get_pages(sbi, F2FS_DIRTY_IMETA),
1402 free_sections(sbi),
1403 free_segments(sbi),
1404 reserved_segments(sbi),
1405 prefree_segments(sbi));
1406
1407 up_write(&sbi->gc_lock);
1408
1409 put_gc_inode(&gc_list);
1410
1411 if (sync && !ret)
1412 ret = sec_freed ? 0 : -EAGAIN;
1413 return ret;
1414}
1415
1416void f2fs_build_gc_manager(struct f2fs_sb_info *sbi)
1417{
1418 DIRTY_I(sbi)->v_ops = &default_v_ops;
1419
1420 sbi->gc_pin_file_threshold = DEF_GC_FAILED_PINNED_FILES;
1421
1422 /* give warm/cold data area from slower device */
1423 if (f2fs_is_multi_device(sbi) && !__is_large_section(sbi))
1424 SIT_I(sbi)->last_victim[ALLOC_NEXT] =
1425 GET_SEGNO(sbi, FDEV(0).end_blk) + 1;
1426}
1427
1428static int free_segment_range(struct f2fs_sb_info *sbi,
1429 unsigned int secs, bool gc_only)
1430{
1431 unsigned int segno, next_inuse, start, end;
1432 struct cp_control cpc = { CP_RESIZE, 0, 0, 0 };
1433 int gc_mode, gc_type;
1434 int err = 0;
1435 int type;
1436
1437 /* Force block allocation for GC */
1438 MAIN_SECS(sbi) -= secs;
1439 start = MAIN_SECS(sbi) * sbi->segs_per_sec;
1440 end = MAIN_SEGS(sbi) - 1;
1441
1442 mutex_lock(&DIRTY_I(sbi)->seglist_lock);
1443 for (gc_mode = 0; gc_mode < MAX_GC_POLICY; gc_mode++)
1444 if (SIT_I(sbi)->last_victim[gc_mode] >= start)
1445 SIT_I(sbi)->last_victim[gc_mode] = 0;
1446
1447 for (gc_type = BG_GC; gc_type <= FG_GC; gc_type++)
1448 if (sbi->next_victim_seg[gc_type] >= start)
1449 sbi->next_victim_seg[gc_type] = NULL_SEGNO;
1450 mutex_unlock(&DIRTY_I(sbi)->seglist_lock);
1451
1452 /* Move out cursegs from the target range */
1453 for (type = CURSEG_HOT_DATA; type < NR_CURSEG_TYPE; type++)
1454 f2fs_allocate_segment_for_resize(sbi, type, start, end);
1455
1456 /* do GC to move out valid blocks in the range */
1457 for (segno = start; segno <= end; segno += sbi->segs_per_sec) {
1458 struct gc_inode_list gc_list = {
1459 .ilist = LIST_HEAD_INIT(gc_list.ilist),
1460 .iroot = RADIX_TREE_INIT(gc_list.iroot, GFP_NOFS),
1461 };
1462
1463 do_garbage_collect(sbi, segno, &gc_list, FG_GC);
1464 put_gc_inode(&gc_list);
1465
1466 if (!gc_only && get_valid_blocks(sbi, segno, true)) {
1467 err = -EAGAIN;
1468 goto out;
1469 }
1470 if (fatal_signal_pending(current)) {
1471 err = -ERESTARTSYS;
1472 goto out;
1473 }
1474 }
1475 if (gc_only)
1476 goto out;
1477
1478 err = f2fs_write_checkpoint(sbi, &cpc);
1479 if (err)
1480 goto out;
1481
1482 next_inuse = find_next_inuse(FREE_I(sbi), end + 1, start);
1483 if (next_inuse <= end) {
1484 f2fs_err(sbi, "segno %u should be free but still inuse!",
1485 next_inuse);
1486 f2fs_bug_on(sbi, 1);
1487 }
1488out:
1489 MAIN_SECS(sbi) += secs;
1490 return err;
1491}
1492
1493static void update_sb_metadata(struct f2fs_sb_info *sbi, int secs)
1494{
1495 struct f2fs_super_block *raw_sb = F2FS_RAW_SUPER(sbi);
1496 int section_count;
1497 int segment_count;
1498 int segment_count_main;
1499 long long block_count;
1500 int segs = secs * sbi->segs_per_sec;
1501
1502 down_write(&sbi->sb_lock);
1503
1504 section_count = le32_to_cpu(raw_sb->section_count);
1505 segment_count = le32_to_cpu(raw_sb->segment_count);
1506 segment_count_main = le32_to_cpu(raw_sb->segment_count_main);
1507 block_count = le64_to_cpu(raw_sb->block_count);
1508
1509 raw_sb->section_count = cpu_to_le32(section_count + secs);
1510 raw_sb->segment_count = cpu_to_le32(segment_count + segs);
1511 raw_sb->segment_count_main = cpu_to_le32(segment_count_main + segs);
1512 raw_sb->block_count = cpu_to_le64(block_count +
1513 (long long)segs * sbi->blocks_per_seg);
1514 if (f2fs_is_multi_device(sbi)) {
1515 int last_dev = sbi->s_ndevs - 1;
1516 int dev_segs =
1517 le32_to_cpu(raw_sb->devs[last_dev].total_segments);
1518
1519 raw_sb->devs[last_dev].total_segments =
1520 cpu_to_le32(dev_segs + segs);
1521 }
1522
1523 up_write(&sbi->sb_lock);
1524}
1525
1526static void update_fs_metadata(struct f2fs_sb_info *sbi, int secs)
1527{
1528 int segs = secs * sbi->segs_per_sec;
1529 long long blks = (long long)segs * sbi->blocks_per_seg;
1530 long long user_block_count =
1531 le64_to_cpu(F2FS_CKPT(sbi)->user_block_count);
1532
1533 SM_I(sbi)->segment_count = (int)SM_I(sbi)->segment_count + segs;
1534 MAIN_SEGS(sbi) = (int)MAIN_SEGS(sbi) + segs;
1535 MAIN_SECS(sbi) += secs;
1536 FREE_I(sbi)->free_sections = (int)FREE_I(sbi)->free_sections + secs;
1537 FREE_I(sbi)->free_segments = (int)FREE_I(sbi)->free_segments + segs;
1538 F2FS_CKPT(sbi)->user_block_count = cpu_to_le64(user_block_count + blks);
1539
1540 if (f2fs_is_multi_device(sbi)) {
1541 int last_dev = sbi->s_ndevs - 1;
1542
1543 FDEV(last_dev).total_segments =
1544 (int)FDEV(last_dev).total_segments + segs;
1545 FDEV(last_dev).end_blk =
1546 (long long)FDEV(last_dev).end_blk + blks;
1547#ifdef CONFIG_BLK_DEV_ZONED
1548 FDEV(last_dev).nr_blkz = (int)FDEV(last_dev).nr_blkz +
1549 (int)(blks >> sbi->log_blocks_per_blkz);
1550#endif
1551 }
1552}
1553
1554int f2fs_resize_fs(struct f2fs_sb_info *sbi, __u64 block_count)
1555{
1556 __u64 old_block_count, shrunk_blocks;
1557 struct cp_control cpc = { CP_RESIZE, 0, 0, 0 };
1558 unsigned int secs;
1559 int err = 0;
1560 __u32 rem;
1561
1562 old_block_count = le64_to_cpu(F2FS_RAW_SUPER(sbi)->block_count);
1563 if (block_count > old_block_count)
1564 return -EINVAL;
1565
1566 if (f2fs_is_multi_device(sbi)) {
1567 int last_dev = sbi->s_ndevs - 1;
1568 __u64 last_segs = FDEV(last_dev).total_segments;
1569
1570 if (block_count + last_segs * sbi->blocks_per_seg <=
1571 old_block_count)
1572 return -EINVAL;
1573 }
1574
1575 /* new fs size should align to section size */
1576 div_u64_rem(block_count, BLKS_PER_SEC(sbi), &rem);
1577 if (rem)
1578 return -EINVAL;
1579
1580 if (block_count == old_block_count)
1581 return 0;
1582
1583 if (is_sbi_flag_set(sbi, SBI_NEED_FSCK)) {
1584 f2fs_err(sbi, "Should run fsck to repair first.");
1585 return -EFSCORRUPTED;
1586 }
1587
1588 if (test_opt(sbi, DISABLE_CHECKPOINT)) {
1589 f2fs_err(sbi, "Checkpoint should be enabled.");
1590 return -EINVAL;
1591 }
1592
1593 shrunk_blocks = old_block_count - block_count;
1594 secs = div_u64(shrunk_blocks, BLKS_PER_SEC(sbi));
1595
1596 /* stop other GC */
1597 if (!down_write_trylock(&sbi->gc_lock))
1598 return -EAGAIN;
1599
1600 /* stop CP to protect MAIN_SEC in free_segment_range */
1601 f2fs_lock_op(sbi);
1602 err = free_segment_range(sbi, secs, true);
1603 f2fs_unlock_op(sbi);
1604 up_write(&sbi->gc_lock);
1605 if (err)
1606 return err;
1607
1608 set_sbi_flag(sbi, SBI_IS_RESIZEFS);
1609
1610 freeze_super(sbi->sb);
1611 down_write(&sbi->gc_lock);
1612 mutex_lock(&sbi->cp_mutex);
1613
1614 spin_lock(&sbi->stat_lock);
1615 if (shrunk_blocks + valid_user_blocks(sbi) +
1616 sbi->current_reserved_blocks + sbi->unusable_block_count +
1617 F2FS_OPTION(sbi).root_reserved_blocks > sbi->user_block_count)
1618 err = -ENOSPC;
1619 else
1620 sbi->user_block_count -= shrunk_blocks;
1621 spin_unlock(&sbi->stat_lock);
1622 if (err)
1623 goto out_err;
1624
1625 err = free_segment_range(sbi, secs, false);
1626 if (err)
1627 goto recover_out;
1628
1629 update_sb_metadata(sbi, -secs);
1630
1631 err = f2fs_commit_super(sbi, false);
1632 if (err) {
1633 update_sb_metadata(sbi, secs);
1634 goto recover_out;
1635 }
1636
1637 update_fs_metadata(sbi, -secs);
1638 clear_sbi_flag(sbi, SBI_IS_RESIZEFS);
1639 set_sbi_flag(sbi, SBI_IS_DIRTY);
1640
1641 err = f2fs_write_checkpoint(sbi, &cpc);
1642 if (err) {
1643 update_fs_metadata(sbi, secs);
1644 update_sb_metadata(sbi, secs);
1645 f2fs_commit_super(sbi, false);
1646 }
1647recover_out:
1648 if (err) {
1649 set_sbi_flag(sbi, SBI_NEED_FSCK);
1650 f2fs_err(sbi, "resize_fs failed, should run fsck to repair!");
1651
1652 spin_lock(&sbi->stat_lock);
1653 sbi->user_block_count += shrunk_blocks;
1654 spin_unlock(&sbi->stat_lock);
1655 }
1656out_err:
1657 mutex_unlock(&sbi->cp_mutex);
1658 up_write(&sbi->gc_lock);
1659 thaw_super(sbi->sb);
1660 clear_sbi_flag(sbi, SBI_IS_RESIZEFS);
1661 return err;
1662}