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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
17#include "f2fs.h"
18#include "node.h"
19#include "segment.h"
20#include "gc.h"
21#include <trace/events/f2fs.h>
22
23static int gc_thread_func(void *data)
24{
25 struct f2fs_sb_info *sbi = data;
26 struct f2fs_gc_kthread *gc_th = sbi->gc_thread;
27 wait_queue_head_t *wq = &sbi->gc_thread->gc_wait_queue_head;
28 unsigned int wait_ms;
29
30 wait_ms = gc_th->min_sleep_time;
31
32 set_freezable();
33 do {
34 wait_event_interruptible_timeout(*wq,
35 kthread_should_stop() || freezing(current) ||
36 gc_th->gc_wake,
37 msecs_to_jiffies(wait_ms));
38
39
40 if (gc_th->gc_wake)
41 gc_th->gc_wake = 0;
42
43 if (try_to_freeze()) {
44 stat_other_skip_bggc_count(sbi);
45 continue;
46 }
47 if (kthread_should_stop())
48 break;
49
50 if (sbi->sb->s_writers.frozen >= SB_FREEZE_WRITE) {
51 increase_sleep_time(gc_th, &wait_ms);
52 stat_other_skip_bggc_count(sbi);
53 continue;
54 }
55
56 if (time_to_inject(sbi, FAULT_CHECKPOINT)) {
57 f2fs_show_injection_info(FAULT_CHECKPOINT);
58 f2fs_stop_checkpoint(sbi, false);
59 }
60
61 if (!sb_start_write_trylock(sbi->sb)) {
62 stat_other_skip_bggc_count(sbi);
63 continue;
64 }
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79 if (sbi->gc_mode == GC_URGENT) {
80 wait_ms = gc_th->urgent_sleep_time;
81 mutex_lock(&sbi->gc_mutex);
82 goto do_gc;
83 }
84
85 if (!mutex_trylock(&sbi->gc_mutex)) {
86 stat_other_skip_bggc_count(sbi);
87 goto next;
88 }
89
90 if (!is_idle(sbi, GC_TIME)) {
91 increase_sleep_time(gc_th, &wait_ms);
92 mutex_unlock(&sbi->gc_mutex);
93 stat_io_skip_bggc_count(sbi);
94 goto next;
95 }
96
97 if (has_enough_invalid_blocks(sbi))
98 decrease_sleep_time(gc_th, &wait_ms);
99 else
100 increase_sleep_time(gc_th, &wait_ms);
101do_gc:
102 stat_inc_bggc_count(sbi);
103
104
105 if (f2fs_gc(sbi, test_opt(sbi, FORCE_FG_GC), true, NULL_SEGNO))
106 wait_ms = gc_th->no_gc_sleep_time;
107
108 trace_f2fs_background_gc(sbi->sb, wait_ms,
109 prefree_segments(sbi), free_segments(sbi));
110
111
112 f2fs_balance_fs_bg(sbi);
113next:
114 sb_end_write(sbi->sb);
115
116 } while (!kthread_should_stop());
117 return 0;
118}
119
120int f2fs_start_gc_thread(struct f2fs_sb_info *sbi)
121{
122 struct f2fs_gc_kthread *gc_th;
123 dev_t dev = sbi->sb->s_bdev->bd_dev;
124 int err = 0;
125
126 gc_th = f2fs_kmalloc(sbi, sizeof(struct f2fs_gc_kthread), GFP_KERNEL);
127 if (!gc_th) {
128 err = -ENOMEM;
129 goto out;
130 }
131
132 gc_th->urgent_sleep_time = DEF_GC_THREAD_URGENT_SLEEP_TIME;
133 gc_th->min_sleep_time = DEF_GC_THREAD_MIN_SLEEP_TIME;
134 gc_th->max_sleep_time = DEF_GC_THREAD_MAX_SLEEP_TIME;
135 gc_th->no_gc_sleep_time = DEF_GC_THREAD_NOGC_SLEEP_TIME;
136
137 gc_th->gc_wake= 0;
138
139 sbi->gc_thread = gc_th;
140 init_waitqueue_head(&sbi->gc_thread->gc_wait_queue_head);
141 sbi->gc_thread->f2fs_gc_task = kthread_run(gc_thread_func, sbi,
142 "f2fs_gc-%u:%u", MAJOR(dev), MINOR(dev));
143 if (IS_ERR(gc_th->f2fs_gc_task)) {
144 err = PTR_ERR(gc_th->f2fs_gc_task);
145 kvfree(gc_th);
146 sbi->gc_thread = NULL;
147 }
148out:
149 return err;
150}
151
152void f2fs_stop_gc_thread(struct f2fs_sb_info *sbi)
153{
154 struct f2fs_gc_kthread *gc_th = sbi->gc_thread;
155 if (!gc_th)
156 return;
157 kthread_stop(gc_th->f2fs_gc_task);
158 kvfree(gc_th);
159 sbi->gc_thread = NULL;
160}
161
162static int select_gc_type(struct f2fs_sb_info *sbi, int gc_type)
163{
164 int gc_mode = (gc_type == BG_GC) ? GC_CB : GC_GREEDY;
165
166 switch (sbi->gc_mode) {
167 case GC_IDLE_CB:
168 gc_mode = GC_CB;
169 break;
170 case GC_IDLE_GREEDY:
171 case GC_URGENT:
172 gc_mode = GC_GREEDY;
173 break;
174 }
175 return gc_mode;
176}
177
178static void select_policy(struct f2fs_sb_info *sbi, int gc_type,
179 int type, struct victim_sel_policy *p)
180{
181 struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
182
183 if (p->alloc_mode == SSR) {
184 p->gc_mode = GC_GREEDY;
185 p->dirty_segmap = dirty_i->dirty_segmap[type];
186 p->max_search = dirty_i->nr_dirty[type];
187 p->ofs_unit = 1;
188 } else {
189 p->gc_mode = select_gc_type(sbi, gc_type);
190 p->dirty_segmap = dirty_i->dirty_segmap[DIRTY];
191 p->max_search = dirty_i->nr_dirty[DIRTY];
192 p->ofs_unit = sbi->segs_per_sec;
193 }
194
195
196 if (gc_type != FG_GC &&
197 (sbi->gc_mode != GC_URGENT) &&
198 p->max_search > sbi->max_victim_search)
199 p->max_search = sbi->max_victim_search;
200
201
202 if (test_opt(sbi, NOHEAP) &&
203 (type == CURSEG_HOT_DATA || IS_NODESEG(type)))
204 p->offset = 0;
205 else
206 p->offset = SIT_I(sbi)->last_victim[p->gc_mode];
207}
208
209static unsigned int get_max_cost(struct f2fs_sb_info *sbi,
210 struct victim_sel_policy *p)
211{
212
213 if (p->alloc_mode == SSR)
214 return sbi->blocks_per_seg;
215 if (p->gc_mode == GC_GREEDY)
216 return 2 * sbi->blocks_per_seg * p->ofs_unit;
217 else if (p->gc_mode == GC_CB)
218 return UINT_MAX;
219 else
220 return 0;
221}
222
223static unsigned int check_bg_victims(struct f2fs_sb_info *sbi)
224{
225 struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
226 unsigned int secno;
227
228
229
230
231
232
233 for_each_set_bit(secno, dirty_i->victim_secmap, MAIN_SECS(sbi)) {
234 if (sec_usage_check(sbi, secno))
235 continue;
236 clear_bit(secno, dirty_i->victim_secmap);
237 return GET_SEG_FROM_SEC(sbi, secno);
238 }
239 return NULL_SEGNO;
240}
241
242static unsigned int get_cb_cost(struct f2fs_sb_info *sbi, unsigned int segno)
243{
244 struct sit_info *sit_i = SIT_I(sbi);
245 unsigned int secno = GET_SEC_FROM_SEG(sbi, segno);
246 unsigned int start = GET_SEG_FROM_SEC(sbi, secno);
247 unsigned long long mtime = 0;
248 unsigned int vblocks;
249 unsigned char age = 0;
250 unsigned char u;
251 unsigned int i;
252
253 for (i = 0; i < sbi->segs_per_sec; i++)
254 mtime += get_seg_entry(sbi, start + i)->mtime;
255 vblocks = get_valid_blocks(sbi, segno, true);
256
257 mtime = div_u64(mtime, sbi->segs_per_sec);
258 vblocks = div_u64(vblocks, sbi->segs_per_sec);
259
260 u = (vblocks * 100) >> sbi->log_blocks_per_seg;
261
262
263 if (mtime < sit_i->min_mtime)
264 sit_i->min_mtime = mtime;
265 if (mtime > sit_i->max_mtime)
266 sit_i->max_mtime = mtime;
267 if (sit_i->max_mtime != sit_i->min_mtime)
268 age = 100 - div64_u64(100 * (mtime - sit_i->min_mtime),
269 sit_i->max_mtime - sit_i->min_mtime);
270
271 return UINT_MAX - ((100 * (100 - u) * age) / (100 + u));
272}
273
274static inline unsigned int get_gc_cost(struct f2fs_sb_info *sbi,
275 unsigned int segno, struct victim_sel_policy *p)
276{
277 if (p->alloc_mode == SSR)
278 return get_seg_entry(sbi, segno)->ckpt_valid_blocks;
279
280
281 if (p->gc_mode == GC_GREEDY)
282 return get_valid_blocks(sbi, segno, true);
283 else
284 return get_cb_cost(sbi, segno);
285}
286
287static unsigned int count_bits(const unsigned long *addr,
288 unsigned int offset, unsigned int len)
289{
290 unsigned int end = offset + len, sum = 0;
291
292 while (offset < end) {
293 if (test_bit(offset++, addr))
294 ++sum;
295 }
296 return sum;
297}
298
299
300
301
302
303
304
305
306
307static int get_victim_by_default(struct f2fs_sb_info *sbi,
308 unsigned int *result, int gc_type, int type, char alloc_mode)
309{
310 struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
311 struct sit_info *sm = SIT_I(sbi);
312 struct victim_sel_policy p;
313 unsigned int secno, last_victim;
314 unsigned int last_segment;
315 unsigned int nsearched = 0;
316
317 mutex_lock(&dirty_i->seglist_lock);
318 last_segment = MAIN_SECS(sbi) * sbi->segs_per_sec;
319
320 p.alloc_mode = alloc_mode;
321 select_policy(sbi, gc_type, type, &p);
322
323 p.min_segno = NULL_SEGNO;
324 p.min_cost = get_max_cost(sbi, &p);
325
326 if (*result != NULL_SEGNO) {
327 if (get_valid_blocks(sbi, *result, false) &&
328 !sec_usage_check(sbi, GET_SEC_FROM_SEG(sbi, *result)))
329 p.min_segno = *result;
330 goto out;
331 }
332
333 if (p.max_search == 0)
334 goto out;
335
336 if (__is_large_section(sbi) && p.alloc_mode == LFS) {
337 if (sbi->next_victim_seg[BG_GC] != NULL_SEGNO) {
338 p.min_segno = sbi->next_victim_seg[BG_GC];
339 *result = p.min_segno;
340 sbi->next_victim_seg[BG_GC] = NULL_SEGNO;
341 goto got_result;
342 }
343 if (gc_type == FG_GC &&
344 sbi->next_victim_seg[FG_GC] != NULL_SEGNO) {
345 p.min_segno = sbi->next_victim_seg[FG_GC];
346 *result = p.min_segno;
347 sbi->next_victim_seg[FG_GC] = NULL_SEGNO;
348 goto got_result;
349 }
350 }
351
352 last_victim = sm->last_victim[p.gc_mode];
353 if (p.alloc_mode == LFS && gc_type == FG_GC) {
354 p.min_segno = check_bg_victims(sbi);
355 if (p.min_segno != NULL_SEGNO)
356 goto got_it;
357 }
358
359 while (1) {
360 unsigned long cost;
361 unsigned int segno;
362
363 segno = find_next_bit(p.dirty_segmap, last_segment, p.offset);
364 if (segno >= last_segment) {
365 if (sm->last_victim[p.gc_mode]) {
366 last_segment =
367 sm->last_victim[p.gc_mode];
368 sm->last_victim[p.gc_mode] = 0;
369 p.offset = 0;
370 continue;
371 }
372 break;
373 }
374
375 p.offset = segno + p.ofs_unit;
376 if (p.ofs_unit > 1) {
377 p.offset -= segno % p.ofs_unit;
378 nsearched += count_bits(p.dirty_segmap,
379 p.offset - p.ofs_unit,
380 p.ofs_unit);
381 } else {
382 nsearched++;
383 }
384
385 secno = GET_SEC_FROM_SEG(sbi, segno);
386
387 if (sec_usage_check(sbi, secno))
388 goto next;
389
390 if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED) &&
391 get_ckpt_valid_blocks(sbi, segno) &&
392 p.alloc_mode != SSR))
393 goto next;
394 if (gc_type == BG_GC && test_bit(secno, dirty_i->victim_secmap))
395 goto next;
396
397 cost = get_gc_cost(sbi, segno, &p);
398
399 if (p.min_cost > cost) {
400 p.min_segno = segno;
401 p.min_cost = cost;
402 }
403next:
404 if (nsearched >= p.max_search) {
405 if (!sm->last_victim[p.gc_mode] && segno <= last_victim)
406 sm->last_victim[p.gc_mode] = last_victim + 1;
407 else
408 sm->last_victim[p.gc_mode] = segno + 1;
409 sm->last_victim[p.gc_mode] %=
410 (MAIN_SECS(sbi) * sbi->segs_per_sec);
411 break;
412 }
413 }
414 if (p.min_segno != NULL_SEGNO) {
415got_it:
416 *result = (p.min_segno / p.ofs_unit) * p.ofs_unit;
417got_result:
418 if (p.alloc_mode == LFS) {
419 secno = GET_SEC_FROM_SEG(sbi, p.min_segno);
420 if (gc_type == FG_GC)
421 sbi->cur_victim_sec = secno;
422 else
423 set_bit(secno, dirty_i->victim_secmap);
424 }
425
426 }
427out:
428 if (p.min_segno != NULL_SEGNO)
429 trace_f2fs_get_victim(sbi->sb, type, gc_type, &p,
430 sbi->cur_victim_sec,
431 prefree_segments(sbi), free_segments(sbi));
432 mutex_unlock(&dirty_i->seglist_lock);
433
434 return (p.min_segno == NULL_SEGNO) ? 0 : 1;
435}
436
437static const struct victim_selection default_v_ops = {
438 .get_victim = get_victim_by_default,
439};
440
441static struct inode *find_gc_inode(struct gc_inode_list *gc_list, nid_t ino)
442{
443 struct inode_entry *ie;
444
445 ie = radix_tree_lookup(&gc_list->iroot, ino);
446 if (ie)
447 return ie->inode;
448 return NULL;
449}
450
451static void add_gc_inode(struct gc_inode_list *gc_list, struct inode *inode)
452{
453 struct inode_entry *new_ie;
454
455 if (inode == find_gc_inode(gc_list, inode->i_ino)) {
456 iput(inode);
457 return;
458 }
459 new_ie = f2fs_kmem_cache_alloc(f2fs_inode_entry_slab, GFP_NOFS);
460 new_ie->inode = inode;
461
462 f2fs_radix_tree_insert(&gc_list->iroot, inode->i_ino, new_ie);
463 list_add_tail(&new_ie->list, &gc_list->ilist);
464}
465
466static void put_gc_inode(struct gc_inode_list *gc_list)
467{
468 struct inode_entry *ie, *next_ie;
469 list_for_each_entry_safe(ie, next_ie, &gc_list->ilist, list) {
470 radix_tree_delete(&gc_list->iroot, ie->inode->i_ino);
471 iput(ie->inode);
472 list_del(&ie->list);
473 kmem_cache_free(f2fs_inode_entry_slab, ie);
474 }
475}
476
477static int check_valid_map(struct f2fs_sb_info *sbi,
478 unsigned int segno, int offset)
479{
480 struct sit_info *sit_i = SIT_I(sbi);
481 struct seg_entry *sentry;
482 int ret;
483
484 down_read(&sit_i->sentry_lock);
485 sentry = get_seg_entry(sbi, segno);
486 ret = f2fs_test_bit(offset, sentry->cur_valid_map);
487 up_read(&sit_i->sentry_lock);
488 return ret;
489}
490
491
492
493
494
495
496static int gc_node_segment(struct f2fs_sb_info *sbi,
497 struct f2fs_summary *sum, unsigned int segno, int gc_type)
498{
499 struct f2fs_summary *entry;
500 block_t start_addr;
501 int off;
502 int phase = 0;
503 bool fggc = (gc_type == FG_GC);
504 int submitted = 0;
505
506 start_addr = START_BLOCK(sbi, segno);
507
508next_step:
509 entry = sum;
510
511 if (fggc && phase == 2)
512 atomic_inc(&sbi->wb_sync_req[NODE]);
513
514 for (off = 0; off < sbi->blocks_per_seg; off++, entry++) {
515 nid_t nid = le32_to_cpu(entry->nid);
516 struct page *node_page;
517 struct node_info ni;
518 int err;
519
520
521 if (gc_type == BG_GC && has_not_enough_free_secs(sbi, 0, 0))
522 return submitted;
523
524 if (check_valid_map(sbi, segno, off) == 0)
525 continue;
526
527 if (phase == 0) {
528 f2fs_ra_meta_pages(sbi, NAT_BLOCK_OFFSET(nid), 1,
529 META_NAT, true);
530 continue;
531 }
532
533 if (phase == 1) {
534 f2fs_ra_node_page(sbi, nid);
535 continue;
536 }
537
538
539 node_page = f2fs_get_node_page(sbi, nid);
540 if (IS_ERR(node_page))
541 continue;
542
543
544 if (check_valid_map(sbi, segno, off) == 0) {
545 f2fs_put_page(node_page, 1);
546 continue;
547 }
548
549 if (f2fs_get_node_info(sbi, nid, &ni)) {
550 f2fs_put_page(node_page, 1);
551 continue;
552 }
553
554 if (ni.blk_addr != start_addr + off) {
555 f2fs_put_page(node_page, 1);
556 continue;
557 }
558
559 err = f2fs_move_node_page(node_page, gc_type);
560 if (!err && gc_type == FG_GC)
561 submitted++;
562 stat_inc_node_blk_count(sbi, 1, gc_type);
563 }
564
565 if (++phase < 3)
566 goto next_step;
567
568 if (fggc)
569 atomic_dec(&sbi->wb_sync_req[NODE]);
570 return submitted;
571}
572
573
574
575
576
577
578
579
580block_t f2fs_start_bidx_of_node(unsigned int node_ofs, struct inode *inode)
581{
582 unsigned int indirect_blks = 2 * NIDS_PER_BLOCK + 4;
583 unsigned int bidx;
584
585 if (node_ofs == 0)
586 return 0;
587
588 if (node_ofs <= 2) {
589 bidx = node_ofs - 1;
590 } else if (node_ofs <= indirect_blks) {
591 int dec = (node_ofs - 4) / (NIDS_PER_BLOCK + 1);
592 bidx = node_ofs - 2 - dec;
593 } else {
594 int dec = (node_ofs - indirect_blks - 3) / (NIDS_PER_BLOCK + 1);
595 bidx = node_ofs - 5 - dec;
596 }
597 return bidx * ADDRS_PER_BLOCK(inode) + ADDRS_PER_INODE(inode);
598}
599
600static bool is_alive(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
601 struct node_info *dni, block_t blkaddr, unsigned int *nofs)
602{
603 struct page *node_page;
604 nid_t nid;
605 unsigned int ofs_in_node;
606 block_t source_blkaddr;
607
608 nid = le32_to_cpu(sum->nid);
609 ofs_in_node = le16_to_cpu(sum->ofs_in_node);
610
611 node_page = f2fs_get_node_page(sbi, nid);
612 if (IS_ERR(node_page))
613 return false;
614
615 if (f2fs_get_node_info(sbi, nid, dni)) {
616 f2fs_put_page(node_page, 1);
617 return false;
618 }
619
620 if (sum->version != dni->version) {
621 f2fs_warn(sbi, "%s: valid data with mismatched node version.",
622 __func__);
623 set_sbi_flag(sbi, SBI_NEED_FSCK);
624 }
625
626 *nofs = ofs_of_node(node_page);
627 source_blkaddr = datablock_addr(NULL, node_page, ofs_in_node);
628 f2fs_put_page(node_page, 1);
629
630 if (source_blkaddr != blkaddr)
631 return false;
632 return true;
633}
634
635static int ra_data_block(struct inode *inode, pgoff_t index)
636{
637 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
638 struct address_space *mapping = inode->i_mapping;
639 struct dnode_of_data dn;
640 struct page *page;
641 struct extent_info ei = {0, 0, 0};
642 struct f2fs_io_info fio = {
643 .sbi = sbi,
644 .ino = inode->i_ino,
645 .type = DATA,
646 .temp = COLD,
647 .op = REQ_OP_READ,
648 .op_flags = 0,
649 .encrypted_page = NULL,
650 .in_list = false,
651 .retry = false,
652 };
653 int err;
654
655 page = f2fs_grab_cache_page(mapping, index, true);
656 if (!page)
657 return -ENOMEM;
658
659 if (f2fs_lookup_extent_cache(inode, index, &ei)) {
660 dn.data_blkaddr = ei.blk + index - ei.fofs;
661 if (unlikely(!f2fs_is_valid_blkaddr(sbi, dn.data_blkaddr,
662 DATA_GENERIC_ENHANCE_READ))) {
663 err = -EFSCORRUPTED;
664 goto put_page;
665 }
666 goto got_it;
667 }
668
669 set_new_dnode(&dn, inode, NULL, NULL, 0);
670 err = f2fs_get_dnode_of_data(&dn, index, LOOKUP_NODE);
671 if (err)
672 goto put_page;
673 f2fs_put_dnode(&dn);
674
675 if (!__is_valid_data_blkaddr(dn.data_blkaddr)) {
676 err = -ENOENT;
677 goto put_page;
678 }
679 if (unlikely(!f2fs_is_valid_blkaddr(sbi, dn.data_blkaddr,
680 DATA_GENERIC_ENHANCE))) {
681 err = -EFSCORRUPTED;
682 goto put_page;
683 }
684got_it:
685
686 fio.page = page;
687 fio.new_blkaddr = fio.old_blkaddr = dn.data_blkaddr;
688
689
690
691
692
693 f2fs_wait_on_page_writeback(page, DATA, true, true);
694
695 f2fs_wait_on_block_writeback(inode, dn.data_blkaddr);
696
697 fio.encrypted_page = f2fs_pagecache_get_page(META_MAPPING(sbi),
698 dn.data_blkaddr,
699 FGP_LOCK | FGP_CREAT, GFP_NOFS);
700 if (!fio.encrypted_page) {
701 err = -ENOMEM;
702 goto put_page;
703 }
704
705 err = f2fs_submit_page_bio(&fio);
706 if (err)
707 goto put_encrypted_page;
708 f2fs_put_page(fio.encrypted_page, 0);
709 f2fs_put_page(page, 1);
710 return 0;
711put_encrypted_page:
712 f2fs_put_page(fio.encrypted_page, 1);
713put_page:
714 f2fs_put_page(page, 1);
715 return err;
716}
717
718
719
720
721
722static int move_data_block(struct inode *inode, block_t bidx,
723 int gc_type, unsigned int segno, int off)
724{
725 struct f2fs_io_info fio = {
726 .sbi = F2FS_I_SB(inode),
727 .ino = inode->i_ino,
728 .type = DATA,
729 .temp = COLD,
730 .op = REQ_OP_READ,
731 .op_flags = 0,
732 .encrypted_page = NULL,
733 .in_list = false,
734 .retry = false,
735 };
736 struct dnode_of_data dn;
737 struct f2fs_summary sum;
738 struct node_info ni;
739 struct page *page, *mpage;
740 block_t newaddr;
741 int err = 0;
742 bool lfs_mode = test_opt(fio.sbi, LFS);
743
744
745 page = f2fs_grab_cache_page(inode->i_mapping, bidx, false);
746 if (!page)
747 return -ENOMEM;
748
749 if (!check_valid_map(F2FS_I_SB(inode), segno, off)) {
750 err = -ENOENT;
751 goto out;
752 }
753
754 if (f2fs_is_atomic_file(inode)) {
755 F2FS_I(inode)->i_gc_failures[GC_FAILURE_ATOMIC]++;
756 F2FS_I_SB(inode)->skipped_atomic_files[gc_type]++;
757 err = -EAGAIN;
758 goto out;
759 }
760
761 if (f2fs_is_pinned_file(inode)) {
762 f2fs_pin_file_control(inode, true);
763 err = -EAGAIN;
764 goto out;
765 }
766
767 set_new_dnode(&dn, inode, NULL, NULL, 0);
768 err = f2fs_get_dnode_of_data(&dn, bidx, LOOKUP_NODE);
769 if (err)
770 goto out;
771
772 if (unlikely(dn.data_blkaddr == NULL_ADDR)) {
773 ClearPageUptodate(page);
774 err = -ENOENT;
775 goto put_out;
776 }
777
778
779
780
781
782 f2fs_wait_on_page_writeback(page, DATA, true, true);
783
784 f2fs_wait_on_block_writeback(inode, dn.data_blkaddr);
785
786 err = f2fs_get_node_info(fio.sbi, dn.nid, &ni);
787 if (err)
788 goto put_out;
789
790 set_summary(&sum, dn.nid, dn.ofs_in_node, ni.version);
791
792
793 fio.page = page;
794 fio.new_blkaddr = fio.old_blkaddr = dn.data_blkaddr;
795
796 if (lfs_mode)
797 down_write(&fio.sbi->io_order_lock);
798
799 mpage = f2fs_grab_cache_page(META_MAPPING(fio.sbi),
800 fio.old_blkaddr, false);
801 if (!mpage)
802 goto up_out;
803
804 fio.encrypted_page = mpage;
805
806
807 if (!PageUptodate(mpage)) {
808 err = f2fs_submit_page_bio(&fio);
809 if (err) {
810 f2fs_put_page(mpage, 1);
811 goto up_out;
812 }
813 lock_page(mpage);
814 if (unlikely(mpage->mapping != META_MAPPING(fio.sbi) ||
815 !PageUptodate(mpage))) {
816 err = -EIO;
817 f2fs_put_page(mpage, 1);
818 goto up_out;
819 }
820 }
821
822 f2fs_allocate_data_block(fio.sbi, NULL, fio.old_blkaddr, &newaddr,
823 &sum, CURSEG_COLD_DATA, NULL, false);
824
825 fio.encrypted_page = f2fs_pagecache_get_page(META_MAPPING(fio.sbi),
826 newaddr, FGP_LOCK | FGP_CREAT, GFP_NOFS);
827 if (!fio.encrypted_page) {
828 err = -ENOMEM;
829 f2fs_put_page(mpage, 1);
830 goto recover_block;
831 }
832
833
834 f2fs_wait_on_page_writeback(fio.encrypted_page, DATA, true, true);
835 memcpy(page_address(fio.encrypted_page),
836 page_address(mpage), PAGE_SIZE);
837 f2fs_put_page(mpage, 1);
838 invalidate_mapping_pages(META_MAPPING(fio.sbi),
839 fio.old_blkaddr, fio.old_blkaddr);
840
841 set_page_dirty(fio.encrypted_page);
842 if (clear_page_dirty_for_io(fio.encrypted_page))
843 dec_page_count(fio.sbi, F2FS_DIRTY_META);
844
845 set_page_writeback(fio.encrypted_page);
846 ClearPageError(page);
847
848
849 f2fs_wait_on_page_writeback(dn.node_page, NODE, true, true);
850
851 fio.op = REQ_OP_WRITE;
852 fio.op_flags = REQ_SYNC;
853 fio.new_blkaddr = newaddr;
854 f2fs_submit_page_write(&fio);
855 if (fio.retry) {
856 err = -EAGAIN;
857 if (PageWriteback(fio.encrypted_page))
858 end_page_writeback(fio.encrypted_page);
859 goto put_page_out;
860 }
861
862 f2fs_update_iostat(fio.sbi, FS_GC_DATA_IO, F2FS_BLKSIZE);
863
864 f2fs_update_data_blkaddr(&dn, newaddr);
865 set_inode_flag(inode, FI_APPEND_WRITE);
866 if (page->index == 0)
867 set_inode_flag(inode, FI_FIRST_BLOCK_WRITTEN);
868put_page_out:
869 f2fs_put_page(fio.encrypted_page, 1);
870recover_block:
871 if (err)
872 f2fs_do_replace_block(fio.sbi, &sum, newaddr, fio.old_blkaddr,
873 true, true);
874up_out:
875 if (lfs_mode)
876 up_write(&fio.sbi->io_order_lock);
877put_out:
878 f2fs_put_dnode(&dn);
879out:
880 f2fs_put_page(page, 1);
881 return err;
882}
883
884static int move_data_page(struct inode *inode, block_t bidx, int gc_type,
885 unsigned int segno, int off)
886{
887 struct page *page;
888 int err = 0;
889
890 page = f2fs_get_lock_data_page(inode, bidx, true);
891 if (IS_ERR(page))
892 return PTR_ERR(page);
893
894 if (!check_valid_map(F2FS_I_SB(inode), segno, off)) {
895 err = -ENOENT;
896 goto out;
897 }
898
899 if (f2fs_is_atomic_file(inode)) {
900 F2FS_I(inode)->i_gc_failures[GC_FAILURE_ATOMIC]++;
901 F2FS_I_SB(inode)->skipped_atomic_files[gc_type]++;
902 err = -EAGAIN;
903 goto out;
904 }
905 if (f2fs_is_pinned_file(inode)) {
906 if (gc_type == FG_GC)
907 f2fs_pin_file_control(inode, true);
908 err = -EAGAIN;
909 goto out;
910 }
911
912 if (gc_type == BG_GC) {
913 if (PageWriteback(page)) {
914 err = -EAGAIN;
915 goto out;
916 }
917 set_page_dirty(page);
918 set_cold_data(page);
919 } else {
920 struct f2fs_io_info fio = {
921 .sbi = F2FS_I_SB(inode),
922 .ino = inode->i_ino,
923 .type = DATA,
924 .temp = COLD,
925 .op = REQ_OP_WRITE,
926 .op_flags = REQ_SYNC,
927 .old_blkaddr = NULL_ADDR,
928 .page = page,
929 .encrypted_page = NULL,
930 .need_lock = LOCK_REQ,
931 .io_type = FS_GC_DATA_IO,
932 };
933 bool is_dirty = PageDirty(page);
934
935retry:
936 f2fs_wait_on_page_writeback(page, DATA, true, true);
937
938 set_page_dirty(page);
939 if (clear_page_dirty_for_io(page)) {
940 inode_dec_dirty_pages(inode);
941 f2fs_remove_dirty_inode(inode);
942 }
943
944 set_cold_data(page);
945
946 err = f2fs_do_write_data_page(&fio);
947 if (err) {
948 clear_cold_data(page);
949 if (err == -ENOMEM) {
950 congestion_wait(BLK_RW_ASYNC, HZ/50);
951 goto retry;
952 }
953 if (is_dirty)
954 set_page_dirty(page);
955 }
956 }
957out:
958 f2fs_put_page(page, 1);
959 return err;
960}
961
962
963
964
965
966
967
968
969static int gc_data_segment(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
970 struct gc_inode_list *gc_list, unsigned int segno, int gc_type)
971{
972 struct super_block *sb = sbi->sb;
973 struct f2fs_summary *entry;
974 block_t start_addr;
975 int off;
976 int phase = 0;
977 int submitted = 0;
978
979 start_addr = START_BLOCK(sbi, segno);
980
981next_step:
982 entry = sum;
983
984 for (off = 0; off < sbi->blocks_per_seg; off++, entry++) {
985 struct page *data_page;
986 struct inode *inode;
987 struct node_info dni;
988 unsigned int ofs_in_node, nofs;
989 block_t start_bidx;
990 nid_t nid = le32_to_cpu(entry->nid);
991
992
993 if (gc_type == BG_GC && has_not_enough_free_secs(sbi, 0, 0))
994 return submitted;
995
996 if (check_valid_map(sbi, segno, off) == 0)
997 continue;
998
999 if (phase == 0) {
1000 f2fs_ra_meta_pages(sbi, NAT_BLOCK_OFFSET(nid), 1,
1001 META_NAT, true);
1002 continue;
1003 }
1004
1005 if (phase == 1) {
1006 f2fs_ra_node_page(sbi, nid);
1007 continue;
1008 }
1009
1010
1011 if (!is_alive(sbi, entry, &dni, start_addr + off, &nofs))
1012 continue;
1013
1014 if (phase == 2) {
1015 f2fs_ra_node_page(sbi, dni.ino);
1016 continue;
1017 }
1018
1019 ofs_in_node = le16_to_cpu(entry->ofs_in_node);
1020
1021 if (phase == 3) {
1022 inode = f2fs_iget(sb, dni.ino);
1023 if (IS_ERR(inode) || is_bad_inode(inode))
1024 continue;
1025
1026 if (!down_write_trylock(
1027 &F2FS_I(inode)->i_gc_rwsem[WRITE])) {
1028 iput(inode);
1029 sbi->skipped_gc_rwsem++;
1030 continue;
1031 }
1032
1033 start_bidx = f2fs_start_bidx_of_node(nofs, inode) +
1034 ofs_in_node;
1035
1036 if (f2fs_post_read_required(inode)) {
1037 int err = ra_data_block(inode, start_bidx);
1038
1039 up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
1040 if (err) {
1041 iput(inode);
1042 continue;
1043 }
1044 add_gc_inode(gc_list, inode);
1045 continue;
1046 }
1047
1048 data_page = f2fs_get_read_data_page(inode,
1049 start_bidx, REQ_RAHEAD, true);
1050 up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
1051 if (IS_ERR(data_page)) {
1052 iput(inode);
1053 continue;
1054 }
1055
1056 f2fs_put_page(data_page, 0);
1057 add_gc_inode(gc_list, inode);
1058 continue;
1059 }
1060
1061
1062 inode = find_gc_inode(gc_list, dni.ino);
1063 if (inode) {
1064 struct f2fs_inode_info *fi = F2FS_I(inode);
1065 bool locked = false;
1066 int err;
1067
1068 if (S_ISREG(inode->i_mode)) {
1069 if (!down_write_trylock(&fi->i_gc_rwsem[READ]))
1070 continue;
1071 if (!down_write_trylock(
1072 &fi->i_gc_rwsem[WRITE])) {
1073 sbi->skipped_gc_rwsem++;
1074 up_write(&fi->i_gc_rwsem[READ]);
1075 continue;
1076 }
1077 locked = true;
1078
1079
1080 inode_dio_wait(inode);
1081 }
1082
1083 start_bidx = f2fs_start_bidx_of_node(nofs, inode)
1084 + ofs_in_node;
1085 if (f2fs_post_read_required(inode))
1086 err = move_data_block(inode, start_bidx,
1087 gc_type, segno, off);
1088 else
1089 err = move_data_page(inode, start_bidx, gc_type,
1090 segno, off);
1091
1092 if (!err && (gc_type == FG_GC ||
1093 f2fs_post_read_required(inode)))
1094 submitted++;
1095
1096 if (locked) {
1097 up_write(&fi->i_gc_rwsem[WRITE]);
1098 up_write(&fi->i_gc_rwsem[READ]);
1099 }
1100
1101 stat_inc_data_blk_count(sbi, 1, gc_type);
1102 }
1103 }
1104
1105 if (++phase < 5)
1106 goto next_step;
1107
1108 return submitted;
1109}
1110
1111static int __get_victim(struct f2fs_sb_info *sbi, unsigned int *victim,
1112 int gc_type)
1113{
1114 struct sit_info *sit_i = SIT_I(sbi);
1115 int ret;
1116
1117 down_write(&sit_i->sentry_lock);
1118 ret = DIRTY_I(sbi)->v_ops->get_victim(sbi, victim, gc_type,
1119 NO_CHECK_TYPE, LFS);
1120 up_write(&sit_i->sentry_lock);
1121 return ret;
1122}
1123
1124static int do_garbage_collect(struct f2fs_sb_info *sbi,
1125 unsigned int start_segno,
1126 struct gc_inode_list *gc_list, int gc_type)
1127{
1128 struct page *sum_page;
1129 struct f2fs_summary_block *sum;
1130 struct blk_plug plug;
1131 unsigned int segno = start_segno;
1132 unsigned int end_segno = start_segno + sbi->segs_per_sec;
1133 int seg_freed = 0, migrated = 0;
1134 unsigned char type = IS_DATASEG(get_seg_entry(sbi, segno)->type) ?
1135 SUM_TYPE_DATA : SUM_TYPE_NODE;
1136 int submitted = 0;
1137
1138 if (__is_large_section(sbi))
1139 end_segno = rounddown(end_segno, sbi->segs_per_sec);
1140
1141
1142 if (__is_large_section(sbi))
1143 f2fs_ra_meta_pages(sbi, GET_SUM_BLOCK(sbi, segno),
1144 end_segno - segno, META_SSA, true);
1145
1146
1147 while (segno < end_segno) {
1148 sum_page = f2fs_get_sum_page(sbi, segno++);
1149 if (IS_ERR(sum_page)) {
1150 int err = PTR_ERR(sum_page);
1151
1152 end_segno = segno - 1;
1153 for (segno = start_segno; segno < end_segno; segno++) {
1154 sum_page = find_get_page(META_MAPPING(sbi),
1155 GET_SUM_BLOCK(sbi, segno));
1156 f2fs_put_page(sum_page, 0);
1157 f2fs_put_page(sum_page, 0);
1158 }
1159 return err;
1160 }
1161 unlock_page(sum_page);
1162 }
1163
1164 blk_start_plug(&plug);
1165
1166 for (segno = start_segno; segno < end_segno; segno++) {
1167
1168
1169 sum_page = find_get_page(META_MAPPING(sbi),
1170 GET_SUM_BLOCK(sbi, segno));
1171 f2fs_put_page(sum_page, 0);
1172
1173 if (get_valid_blocks(sbi, segno, false) == 0)
1174 goto freed;
1175 if (__is_large_section(sbi) &&
1176 migrated >= sbi->migration_granularity)
1177 goto skip;
1178 if (!PageUptodate(sum_page) || unlikely(f2fs_cp_error(sbi)))
1179 goto skip;
1180
1181 sum = page_address(sum_page);
1182 if (type != GET_SUM_TYPE((&sum->footer))) {
1183 f2fs_err(sbi, "Inconsistent segment (%u) type [%d, %d] in SSA and SIT",
1184 segno, type, GET_SUM_TYPE((&sum->footer)));
1185 set_sbi_flag(sbi, SBI_NEED_FSCK);
1186 f2fs_stop_checkpoint(sbi, false);
1187 goto skip;
1188 }
1189
1190
1191
1192
1193
1194
1195
1196
1197 if (type == SUM_TYPE_NODE)
1198 submitted += gc_node_segment(sbi, sum->entries, segno,
1199 gc_type);
1200 else
1201 submitted += gc_data_segment(sbi, sum->entries, gc_list,
1202 segno, gc_type);
1203
1204 stat_inc_seg_count(sbi, type, gc_type);
1205
1206freed:
1207 if (gc_type == FG_GC &&
1208 get_valid_blocks(sbi, segno, false) == 0)
1209 seg_freed++;
1210 migrated++;
1211
1212 if (__is_large_section(sbi) && segno + 1 < end_segno)
1213 sbi->next_victim_seg[gc_type] = segno + 1;
1214skip:
1215 f2fs_put_page(sum_page, 0);
1216 }
1217
1218 if (submitted)
1219 f2fs_submit_merged_write(sbi,
1220 (type == SUM_TYPE_NODE) ? NODE : DATA);
1221
1222 blk_finish_plug(&plug);
1223
1224 stat_inc_call_count(sbi->stat_info);
1225
1226 return seg_freed;
1227}
1228
1229int f2fs_gc(struct f2fs_sb_info *sbi, bool sync,
1230 bool background, unsigned int segno)
1231{
1232 int gc_type = sync ? FG_GC : BG_GC;
1233 int sec_freed = 0, seg_freed = 0, total_freed = 0;
1234 int ret = 0;
1235 struct cp_control cpc;
1236 unsigned int init_segno = segno;
1237 struct gc_inode_list gc_list = {
1238 .ilist = LIST_HEAD_INIT(gc_list.ilist),
1239 .iroot = RADIX_TREE_INIT(gc_list.iroot, GFP_NOFS),
1240 };
1241 unsigned long long last_skipped = sbi->skipped_atomic_files[FG_GC];
1242 unsigned long long first_skipped;
1243 unsigned int skipped_round = 0, round = 0;
1244
1245 trace_f2fs_gc_begin(sbi->sb, sync, background,
1246 get_pages(sbi, F2FS_DIRTY_NODES),
1247 get_pages(sbi, F2FS_DIRTY_DENTS),
1248 get_pages(sbi, F2FS_DIRTY_IMETA),
1249 free_sections(sbi),
1250 free_segments(sbi),
1251 reserved_segments(sbi),
1252 prefree_segments(sbi));
1253
1254 cpc.reason = __get_cp_reason(sbi);
1255 sbi->skipped_gc_rwsem = 0;
1256 first_skipped = last_skipped;
1257gc_more:
1258 if (unlikely(!(sbi->sb->s_flags & SB_ACTIVE))) {
1259 ret = -EINVAL;
1260 goto stop;
1261 }
1262 if (unlikely(f2fs_cp_error(sbi))) {
1263 ret = -EIO;
1264 goto stop;
1265 }
1266
1267 if (gc_type == BG_GC && has_not_enough_free_secs(sbi, 0, 0)) {
1268
1269
1270
1271
1272
1273 if (prefree_segments(sbi) &&
1274 !is_sbi_flag_set(sbi, SBI_CP_DISABLED)) {
1275 ret = f2fs_write_checkpoint(sbi, &cpc);
1276 if (ret)
1277 goto stop;
1278 }
1279 if (has_not_enough_free_secs(sbi, 0, 0))
1280 gc_type = FG_GC;
1281 }
1282
1283
1284 if (gc_type == BG_GC && !background) {
1285 ret = -EINVAL;
1286 goto stop;
1287 }
1288 if (!__get_victim(sbi, &segno, gc_type)) {
1289 ret = -ENODATA;
1290 goto stop;
1291 }
1292
1293 seg_freed = do_garbage_collect(sbi, segno, &gc_list, gc_type);
1294 if (gc_type == FG_GC && seg_freed == sbi->segs_per_sec)
1295 sec_freed++;
1296 total_freed += seg_freed;
1297
1298 if (gc_type == FG_GC) {
1299 if (sbi->skipped_atomic_files[FG_GC] > last_skipped ||
1300 sbi->skipped_gc_rwsem)
1301 skipped_round++;
1302 last_skipped = sbi->skipped_atomic_files[FG_GC];
1303 round++;
1304 }
1305
1306 if (gc_type == FG_GC)
1307 sbi->cur_victim_sec = NULL_SEGNO;
1308
1309 if (sync)
1310 goto stop;
1311
1312 if (has_not_enough_free_secs(sbi, sec_freed, 0)) {
1313 if (skipped_round <= MAX_SKIP_GC_COUNT ||
1314 skipped_round * 2 < round) {
1315 segno = NULL_SEGNO;
1316 goto gc_more;
1317 }
1318
1319 if (first_skipped < last_skipped &&
1320 (last_skipped - first_skipped) >
1321 sbi->skipped_gc_rwsem) {
1322 f2fs_drop_inmem_pages_all(sbi, true);
1323 segno = NULL_SEGNO;
1324 goto gc_more;
1325 }
1326 if (gc_type == FG_GC && !is_sbi_flag_set(sbi, SBI_CP_DISABLED))
1327 ret = f2fs_write_checkpoint(sbi, &cpc);
1328 }
1329stop:
1330 SIT_I(sbi)->last_victim[ALLOC_NEXT] = 0;
1331 SIT_I(sbi)->last_victim[FLUSH_DEVICE] = init_segno;
1332
1333 trace_f2fs_gc_end(sbi->sb, ret, total_freed, sec_freed,
1334 get_pages(sbi, F2FS_DIRTY_NODES),
1335 get_pages(sbi, F2FS_DIRTY_DENTS),
1336 get_pages(sbi, F2FS_DIRTY_IMETA),
1337 free_sections(sbi),
1338 free_segments(sbi),
1339 reserved_segments(sbi),
1340 prefree_segments(sbi));
1341
1342 mutex_unlock(&sbi->gc_mutex);
1343
1344 put_gc_inode(&gc_list);
1345
1346 if (sync && !ret)
1347 ret = sec_freed ? 0 : -EAGAIN;
1348 return ret;
1349}
1350
1351void f2fs_build_gc_manager(struct f2fs_sb_info *sbi)
1352{
1353 DIRTY_I(sbi)->v_ops = &default_v_ops;
1354
1355 sbi->gc_pin_file_threshold = DEF_GC_FAILED_PINNED_FILES;
1356
1357
1358 if (f2fs_is_multi_device(sbi) && !__is_large_section(sbi))
1359 SIT_I(sbi)->last_victim[ALLOC_NEXT] =
1360 GET_SEGNO(sbi, FDEV(0).end_blk) + 1;
1361}
1362
1363static int free_segment_range(struct f2fs_sb_info *sbi, unsigned int start,
1364 unsigned int end)
1365{
1366 int type;
1367 unsigned int segno, next_inuse;
1368 int err = 0;
1369
1370
1371 for (type = CURSEG_HOT_DATA; type < NR_CURSEG_TYPE; type++)
1372 allocate_segment_for_resize(sbi, type, start, end);
1373
1374
1375 for (segno = start; segno <= end; segno += sbi->segs_per_sec) {
1376 struct gc_inode_list gc_list = {
1377 .ilist = LIST_HEAD_INIT(gc_list.ilist),
1378 .iroot = RADIX_TREE_INIT(gc_list.iroot, GFP_NOFS),
1379 };
1380
1381 mutex_lock(&sbi->gc_mutex);
1382 do_garbage_collect(sbi, segno, &gc_list, FG_GC);
1383 mutex_unlock(&sbi->gc_mutex);
1384 put_gc_inode(&gc_list);
1385
1386 if (get_valid_blocks(sbi, segno, true))
1387 return -EAGAIN;
1388 }
1389
1390 err = f2fs_sync_fs(sbi->sb, 1);
1391 if (err)
1392 return err;
1393
1394 next_inuse = find_next_inuse(FREE_I(sbi), end + 1, start);
1395 if (next_inuse <= end) {
1396 f2fs_err(sbi, "segno %u should be free but still inuse!",
1397 next_inuse);
1398 f2fs_bug_on(sbi, 1);
1399 }
1400 return err;
1401}
1402
1403static void update_sb_metadata(struct f2fs_sb_info *sbi, int secs)
1404{
1405 struct f2fs_super_block *raw_sb = F2FS_RAW_SUPER(sbi);
1406 int section_count = le32_to_cpu(raw_sb->section_count);
1407 int segment_count = le32_to_cpu(raw_sb->segment_count);
1408 int segment_count_main = le32_to_cpu(raw_sb->segment_count_main);
1409 long long block_count = le64_to_cpu(raw_sb->block_count);
1410 int segs = secs * sbi->segs_per_sec;
1411
1412 raw_sb->section_count = cpu_to_le32(section_count + secs);
1413 raw_sb->segment_count = cpu_to_le32(segment_count + segs);
1414 raw_sb->segment_count_main = cpu_to_le32(segment_count_main + segs);
1415 raw_sb->block_count = cpu_to_le64(block_count +
1416 (long long)segs * sbi->blocks_per_seg);
1417}
1418
1419static void update_fs_metadata(struct f2fs_sb_info *sbi, int secs)
1420{
1421 int segs = secs * sbi->segs_per_sec;
1422 long long user_block_count =
1423 le64_to_cpu(F2FS_CKPT(sbi)->user_block_count);
1424
1425 SM_I(sbi)->segment_count = (int)SM_I(sbi)->segment_count + segs;
1426 MAIN_SEGS(sbi) = (int)MAIN_SEGS(sbi) + segs;
1427 FREE_I(sbi)->free_sections = (int)FREE_I(sbi)->free_sections + secs;
1428 FREE_I(sbi)->free_segments = (int)FREE_I(sbi)->free_segments + segs;
1429 F2FS_CKPT(sbi)->user_block_count = cpu_to_le64(user_block_count +
1430 (long long)segs * sbi->blocks_per_seg);
1431}
1432
1433int f2fs_resize_fs(struct f2fs_sb_info *sbi, __u64 block_count)
1434{
1435 __u64 old_block_count, shrunk_blocks;
1436 unsigned int secs;
1437 int gc_mode, gc_type;
1438 int err = 0;
1439 __u32 rem;
1440
1441 old_block_count = le64_to_cpu(F2FS_RAW_SUPER(sbi)->block_count);
1442 if (block_count > old_block_count)
1443 return -EINVAL;
1444
1445
1446 div_u64_rem(block_count, BLKS_PER_SEC(sbi), &rem);
1447 if (rem)
1448 return -EINVAL;
1449
1450 if (block_count == old_block_count)
1451 return 0;
1452
1453 if (is_sbi_flag_set(sbi, SBI_NEED_FSCK)) {
1454 f2fs_err(sbi, "Should run fsck to repair first.");
1455 return -EFSCORRUPTED;
1456 }
1457
1458 if (test_opt(sbi, DISABLE_CHECKPOINT)) {
1459 f2fs_err(sbi, "Checkpoint should be enabled.");
1460 return -EINVAL;
1461 }
1462
1463 freeze_bdev(sbi->sb->s_bdev);
1464
1465 shrunk_blocks = old_block_count - block_count;
1466 secs = div_u64(shrunk_blocks, BLKS_PER_SEC(sbi));
1467 spin_lock(&sbi->stat_lock);
1468 if (shrunk_blocks + valid_user_blocks(sbi) +
1469 sbi->current_reserved_blocks + sbi->unusable_block_count +
1470 F2FS_OPTION(sbi).root_reserved_blocks > sbi->user_block_count)
1471 err = -ENOSPC;
1472 else
1473 sbi->user_block_count -= shrunk_blocks;
1474 spin_unlock(&sbi->stat_lock);
1475 if (err) {
1476 thaw_bdev(sbi->sb->s_bdev, sbi->sb);
1477 return err;
1478 }
1479
1480 mutex_lock(&sbi->resize_mutex);
1481 set_sbi_flag(sbi, SBI_IS_RESIZEFS);
1482
1483 mutex_lock(&DIRTY_I(sbi)->seglist_lock);
1484
1485 MAIN_SECS(sbi) -= secs;
1486
1487 for (gc_mode = 0; gc_mode < MAX_GC_POLICY; gc_mode++)
1488 if (SIT_I(sbi)->last_victim[gc_mode] >=
1489 MAIN_SECS(sbi) * sbi->segs_per_sec)
1490 SIT_I(sbi)->last_victim[gc_mode] = 0;
1491
1492 for (gc_type = BG_GC; gc_type <= FG_GC; gc_type++)
1493 if (sbi->next_victim_seg[gc_type] >=
1494 MAIN_SECS(sbi) * sbi->segs_per_sec)
1495 sbi->next_victim_seg[gc_type] = NULL_SEGNO;
1496
1497 mutex_unlock(&DIRTY_I(sbi)->seglist_lock);
1498
1499 err = free_segment_range(sbi, MAIN_SECS(sbi) * sbi->segs_per_sec,
1500 MAIN_SEGS(sbi) - 1);
1501 if (err)
1502 goto out;
1503
1504 update_sb_metadata(sbi, -secs);
1505
1506 err = f2fs_commit_super(sbi, false);
1507 if (err) {
1508 update_sb_metadata(sbi, secs);
1509 goto out;
1510 }
1511
1512 update_fs_metadata(sbi, -secs);
1513 clear_sbi_flag(sbi, SBI_IS_RESIZEFS);
1514 err = f2fs_sync_fs(sbi->sb, 1);
1515 if (err) {
1516 update_fs_metadata(sbi, secs);
1517 update_sb_metadata(sbi, secs);
1518 f2fs_commit_super(sbi, false);
1519 }
1520out:
1521 if (err) {
1522 set_sbi_flag(sbi, SBI_NEED_FSCK);
1523 f2fs_err(sbi, "resize_fs failed, should run fsck to repair!");
1524
1525 MAIN_SECS(sbi) += secs;
1526 spin_lock(&sbi->stat_lock);
1527 sbi->user_block_count += shrunk_blocks;
1528 spin_unlock(&sbi->stat_lock);
1529 }
1530 clear_sbi_flag(sbi, SBI_IS_RESIZEFS);
1531 mutex_unlock(&sbi->resize_mutex);
1532 thaw_bdev(sbi->sb->s_bdev, sbi->sb);
1533 return err;
1534}
1535
