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fanotify: merge duplicate events on parent and child
[linux/fpc-iii.git] / fs / f2fs / gc.c
blob3cced15efebc263ec6b0093963c6ece3e4187519
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
17 #include "f2fs.h"
18 #include "node.h"
19 #include "segment.h"
20 #include "gc.h"
21 #include <trace/events/f2fs.h>
22
23 static 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 /* give it a try one time */
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(sbi, 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 * [GC triggering condition]
68 * 0. GC is not conducted currently.
69 * 1. There are enough dirty segments.
70 * 2. IO subsystem is idle by checking the # of writeback pages.
71 * 3. IO subsystem is idle by checking the # of requests in
72 * bdev's request list.
73 *
74 * Note) We have to avoid triggering GCs frequently.
75 * Because it is possible that some segments can be
76 * invalidated soon after by user update or deletion.
77 * So, I'd like to wait some time to collect dirty segments.
78 */
79 if (sbi->gc_mode == GC_URGENT) {
80 wait_ms = gc_th->urgent_sleep_time;
81 down_write(&sbi->gc_lock);
82 goto do_gc;
83 }
84
85 if (!down_write_trylock(&sbi->gc_lock)) {
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 up_write(&sbi->gc_lock);
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);
101 do_gc:
102 stat_inc_bggc_count(sbi->stat_info);
103
104 /* if return value is not zero, no victim was selected */
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 /* balancing f2fs's metadata periodically */
112 f2fs_balance_fs_bg(sbi);
113 next:
114 sb_end_write(sbi->sb);
115
116 } while (!kthread_should_stop());
117 return 0;
118 }
119
120 int 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 }
148 out:
149 return err;
150 }
151
152 void 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
162 static 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
178 static 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 /* we need to check every dirty segments in the FG_GC case */
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 /* let's select beginning hot/small space first in no_heap mode*/
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
209 static unsigned int get_max_cost(struct f2fs_sb_info *sbi,
210 struct victim_sel_policy *p)
211 {
212 /* SSR allocates in a segment unit */
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 /* No other gc_mode */
220 return 0;
221 }
222
223 static 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 * If the gc_type is FG_GC, we can select victim segments
230 * selected by background GC before.
231 * Those segments guarantee they have small valid blocks.
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
242 static 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 /* Handle if the system time has changed by the user */
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
274 static 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 /* alloc_mode == LFS */
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
287 static 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 * This function is called from two paths.
301 * One is garbage collection and the other is SSR segment selection.
302 * When it is called during GC, it just gets a victim segment
303 * and it does not remove it from dirty seglist.
304 * When it is called from SSR segment selection, it finds a segment
305 * which has minimum valid blocks and removes it from dirty seglist.
306 */
307 static 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 #ifdef CONFIG_F2FS_CHECK_FS
386 /*
387 * skip selecting the invalid segno (that is failed due to block
388 * validity check failure during GC) to avoid endless GC loop in
389 * such cases.
390 */
391 if (test_bit(segno, sm->invalid_segmap))
392 goto next;
393 #endif
394
395 secno = GET_SEC_FROM_SEG(sbi, segno);
396
397 if (sec_usage_check(sbi, secno))
398 goto next;
399 /* Don't touch checkpointed data */
400 if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED) &&
401 get_ckpt_valid_blocks(sbi, segno) &&
402 p.alloc_mode != SSR))
403 goto next;
404 if (gc_type == BG_GC && test_bit(secno, dirty_i->victim_secmap))
405 goto next;
406
407 cost = get_gc_cost(sbi, segno, &p);
408
409 if (p.min_cost > cost) {
410 p.min_segno = segno;
411 p.min_cost = cost;
412 }
413 next:
414 if (nsearched >= p.max_search) {
415 if (!sm->last_victim[p.gc_mode] && segno <= last_victim)
416 sm->last_victim[p.gc_mode] = last_victim + 1;
417 else
418 sm->last_victim[p.gc_mode] = segno + 1;
419 sm->last_victim[p.gc_mode] %=
420 (MAIN_SECS(sbi) * sbi->segs_per_sec);
421 break;
422 }
423 }
424 if (p.min_segno != NULL_SEGNO) {
425 got_it:
426 *result = (p.min_segno / p.ofs_unit) * p.ofs_unit;
427 got_result:
428 if (p.alloc_mode == LFS) {
429 secno = GET_SEC_FROM_SEG(sbi, p.min_segno);
430 if (gc_type == FG_GC)
431 sbi->cur_victim_sec = secno;
432 else
433 set_bit(secno, dirty_i->victim_secmap);
434 }
435
436 }
437 out:
438 if (p.min_segno != NULL_SEGNO)
439 trace_f2fs_get_victim(sbi->sb, type, gc_type, &p,
440 sbi->cur_victim_sec,
441 prefree_segments(sbi), free_segments(sbi));
442 mutex_unlock(&dirty_i->seglist_lock);
443
444 return (p.min_segno == NULL_SEGNO) ? 0 : 1;
445 }
446
447 static const struct victim_selection default_v_ops = {
448 .get_victim = get_victim_by_default,
449 };
450
451 static struct inode *find_gc_inode(struct gc_inode_list *gc_list, nid_t ino)
452 {
453 struct inode_entry *ie;
454
455 ie = radix_tree_lookup(&gc_list->iroot, ino);
456 if (ie)
457 return ie->inode;
458 return NULL;
459 }
460
461 static void add_gc_inode(struct gc_inode_list *gc_list, struct inode *inode)
462 {
463 struct inode_entry *new_ie;
464
465 if (inode == find_gc_inode(gc_list, inode->i_ino)) {
466 iput(inode);
467 return;
468 }
469 new_ie = f2fs_kmem_cache_alloc(f2fs_inode_entry_slab, GFP_NOFS);
470 new_ie->inode = inode;
471
472 f2fs_radix_tree_insert(&gc_list->iroot, inode->i_ino, new_ie);
473 list_add_tail(&new_ie->list, &gc_list->ilist);
474 }
475
476 static void put_gc_inode(struct gc_inode_list *gc_list)
477 {
478 struct inode_entry *ie, *next_ie;
479 list_for_each_entry_safe(ie, next_ie, &gc_list->ilist, list) {
480 radix_tree_delete(&gc_list->iroot, ie->inode->i_ino);
481 iput(ie->inode);
482 list_del(&ie->list);
483 kmem_cache_free(f2fs_inode_entry_slab, ie);
484 }
485 }
486
487 static int check_valid_map(struct f2fs_sb_info *sbi,
488 unsigned int segno, int offset)
489 {
490 struct sit_info *sit_i = SIT_I(sbi);
491 struct seg_entry *sentry;
492 int ret;
493
494 down_read(&sit_i->sentry_lock);
495 sentry = get_seg_entry(sbi, segno);
496 ret = f2fs_test_bit(offset, sentry->cur_valid_map);
497 up_read(&sit_i->sentry_lock);
498 return ret;
499 }
500
501 /*
502 * This function compares node address got in summary with that in NAT.
503 * On validity, copy that node with cold status, otherwise (invalid node)
504 * ignore that.
505 */
506 static int gc_node_segment(struct f2fs_sb_info *sbi,
507 struct f2fs_summary *sum, unsigned int segno, int gc_type)
508 {
509 struct f2fs_summary *entry;
510 block_t start_addr;
511 int off;
512 int phase = 0;
513 bool fggc = (gc_type == FG_GC);
514 int submitted = 0;
515
516 start_addr = START_BLOCK(sbi, segno);
517
518 next_step:
519 entry = sum;
520
521 if (fggc && phase == 2)
522 atomic_inc(&sbi->wb_sync_req[NODE]);
523
524 for (off = 0; off < sbi->blocks_per_seg; off++, entry++) {
525 nid_t nid = le32_to_cpu(entry->nid);
526 struct page *node_page;
527 struct node_info ni;
528 int err;
529
530 /* stop BG_GC if there is not enough free sections. */
531 if (gc_type == BG_GC && has_not_enough_free_secs(sbi, 0, 0))
532 return submitted;
533
534 if (check_valid_map(sbi, segno, off) == 0)
535 continue;
536
537 if (phase == 0) {
538 f2fs_ra_meta_pages(sbi, NAT_BLOCK_OFFSET(nid), 1,
539 META_NAT, true);
540 continue;
541 }
542
543 if (phase == 1) {
544 f2fs_ra_node_page(sbi, nid);
545 continue;
546 }
547
548 /* phase == 2 */
549 node_page = f2fs_get_node_page(sbi, nid);
550 if (IS_ERR(node_page))
551 continue;
552
553 /* block may become invalid during f2fs_get_node_page */
554 if (check_valid_map(sbi, segno, off) == 0) {
555 f2fs_put_page(node_page, 1);
556 continue;
557 }
558
559 if (f2fs_get_node_info(sbi, nid, &ni)) {
560 f2fs_put_page(node_page, 1);
561 continue;
562 }
563
564 if (ni.blk_addr != start_addr + off) {
565 f2fs_put_page(node_page, 1);
566 continue;
567 }
568
569 err = f2fs_move_node_page(node_page, gc_type);
570 if (!err && gc_type == FG_GC)
571 submitted++;
572 stat_inc_node_blk_count(sbi, 1, gc_type);
573 }
574
575 if (++phase < 3)
576 goto next_step;
577
578 if (fggc)
579 atomic_dec(&sbi->wb_sync_req[NODE]);
580 return submitted;
581 }
582
583 /*
584 * Calculate start block index indicating the given node offset.
585 * Be careful, caller should give this node offset only indicating direct node
586 * blocks. If any node offsets, which point the other types of node blocks such
587 * as indirect or double indirect node blocks, are given, it must be a caller's
588 * bug.
589 */
590 block_t f2fs_start_bidx_of_node(unsigned int node_ofs, struct inode *inode)
591 {
592 unsigned int indirect_blks = 2 * NIDS_PER_BLOCK + 4;
593 unsigned int bidx;
594
595 if (node_ofs == 0)
596 return 0;
597
598 if (node_ofs <= 2) {
599 bidx = node_ofs - 1;
600 } else if (node_ofs <= indirect_blks) {
601 int dec = (node_ofs - 4) / (NIDS_PER_BLOCK + 1);
602 bidx = node_ofs - 2 - dec;
603 } else {
604 int dec = (node_ofs - indirect_blks - 3) / (NIDS_PER_BLOCK + 1);
605 bidx = node_ofs - 5 - dec;
606 }
607 return bidx * ADDRS_PER_BLOCK(inode) + ADDRS_PER_INODE(inode);
608 }
609
610 static bool is_alive(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
611 struct node_info *dni, block_t blkaddr, unsigned int *nofs)
612 {
613 struct page *node_page;
614 nid_t nid;
615 unsigned int ofs_in_node;
616 block_t source_blkaddr;
617
618 nid = le32_to_cpu(sum->nid);
619 ofs_in_node = le16_to_cpu(sum->ofs_in_node);
620
621 node_page = f2fs_get_node_page(sbi, nid);
622 if (IS_ERR(node_page))
623 return false;
624
625 if (f2fs_get_node_info(sbi, nid, dni)) {
626 f2fs_put_page(node_page, 1);
627 return false;
628 }
629
630 if (sum->version != dni->version) {
631 f2fs_warn(sbi, "%s: valid data with mismatched node version.",
632 __func__);
633 set_sbi_flag(sbi, SBI_NEED_FSCK);
634 }
635
636 *nofs = ofs_of_node(node_page);
637 source_blkaddr = datablock_addr(NULL, node_page, ofs_in_node);
638 f2fs_put_page(node_page, 1);
639
640 if (source_blkaddr != blkaddr) {
641 #ifdef CONFIG_F2FS_CHECK_FS
642 unsigned int segno = GET_SEGNO(sbi, blkaddr);
643 unsigned long offset = GET_BLKOFF_FROM_SEG0(sbi, blkaddr);
644
645 if (unlikely(check_valid_map(sbi, segno, offset))) {
646 if (!test_and_set_bit(segno, SIT_I(sbi)->invalid_segmap)) {
647 f2fs_err(sbi, "mismatched blkaddr %u (source_blkaddr %u) in seg %u\n",
648 blkaddr, source_blkaddr, segno);
649 f2fs_bug_on(sbi, 1);
650 }
651 }
652 #endif
653 return false;
654 }
655 return true;
656 }
657
658 static int ra_data_block(struct inode *inode, pgoff_t index)
659 {
660 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
661 struct address_space *mapping = inode->i_mapping;
662 struct dnode_of_data dn;
663 struct page *page;
664 struct extent_info ei = {0, 0, 0};
665 struct f2fs_io_info fio = {
666 .sbi = sbi,
667 .ino = inode->i_ino,
668 .type = DATA,
669 .temp = COLD,
670 .op = REQ_OP_READ,
671 .op_flags = 0,
672 .encrypted_page = NULL,
673 .in_list = false,
674 .retry = false,
675 };
676 int err;
677
678 page = f2fs_grab_cache_page(mapping, index, true);
679 if (!page)
680 return -ENOMEM;
681
682 if (f2fs_lookup_extent_cache(inode, index, &ei)) {
683 dn.data_blkaddr = ei.blk + index - ei.fofs;
684 if (unlikely(!f2fs_is_valid_blkaddr(sbi, dn.data_blkaddr,
685 DATA_GENERIC_ENHANCE_READ))) {
686 err = -EFSCORRUPTED;
687 goto put_page;
688 }
689 goto got_it;
690 }
691
692 set_new_dnode(&dn, inode, NULL, NULL, 0);
693 err = f2fs_get_dnode_of_data(&dn, index, LOOKUP_NODE);
694 if (err)
695 goto put_page;
696 f2fs_put_dnode(&dn);
697
698 if (!__is_valid_data_blkaddr(dn.data_blkaddr)) {
699 err = -ENOENT;
700 goto put_page;
701 }
702 if (unlikely(!f2fs_is_valid_blkaddr(sbi, dn.data_blkaddr,
703 DATA_GENERIC_ENHANCE))) {
704 err = -EFSCORRUPTED;
705 goto put_page;
706 }
707 got_it:
708 /* read page */
709 fio.page = page;
710 fio.new_blkaddr = fio.old_blkaddr = dn.data_blkaddr;
711
712 /*
713 * don't cache encrypted data into meta inode until previous dirty
714 * data were writebacked to avoid racing between GC and flush.
715 */
716 f2fs_wait_on_page_writeback(page, DATA, true, true);
717
718 f2fs_wait_on_block_writeback(inode, dn.data_blkaddr);
719
720 fio.encrypted_page = f2fs_pagecache_get_page(META_MAPPING(sbi),
721 dn.data_blkaddr,
722 FGP_LOCK | FGP_CREAT, GFP_NOFS);
723 if (!fio.encrypted_page) {
724 err = -ENOMEM;
725 goto put_page;
726 }
727
728 err = f2fs_submit_page_bio(&fio);
729 if (err)
730 goto put_encrypted_page;
731 f2fs_put_page(fio.encrypted_page, 0);
732 f2fs_put_page(page, 1);
733 return 0;
734 put_encrypted_page:
735 f2fs_put_page(fio.encrypted_page, 1);
736 put_page:
737 f2fs_put_page(page, 1);
738 return err;
739 }
740
741 /*
742 * Move data block via META_MAPPING while keeping locked data page.
743 * This can be used to move blocks, aka LBAs, directly on disk.
744 */
745 static int move_data_block(struct inode *inode, block_t bidx,
746 int gc_type, unsigned int segno, int off)
747 {
748 struct f2fs_io_info fio = {
749 .sbi = F2FS_I_SB(inode),
750 .ino = inode->i_ino,
751 .type = DATA,
752 .temp = COLD,
753 .op = REQ_OP_READ,
754 .op_flags = 0,
755 .encrypted_page = NULL,
756 .in_list = false,
757 .retry = false,
758 };
759 struct dnode_of_data dn;
760 struct f2fs_summary sum;
761 struct node_info ni;
762 struct page *page, *mpage;
763 block_t newaddr;
764 int err = 0;
765 bool lfs_mode = test_opt(fio.sbi, LFS);
766
767 /* do not read out */
768 page = f2fs_grab_cache_page(inode->i_mapping, bidx, false);
769 if (!page)
770 return -ENOMEM;
771
772 if (!check_valid_map(F2FS_I_SB(inode), segno, off)) {
773 err = -ENOENT;
774 goto out;
775 }
776
777 if (f2fs_is_atomic_file(inode)) {
778 F2FS_I(inode)->i_gc_failures[GC_FAILURE_ATOMIC]++;
779 F2FS_I_SB(inode)->skipped_atomic_files[gc_type]++;
780 err = -EAGAIN;
781 goto out;
782 }
783
784 if (f2fs_is_pinned_file(inode)) {
785 f2fs_pin_file_control(inode, true);
786 err = -EAGAIN;
787 goto out;
788 }
789
790 set_new_dnode(&dn, inode, NULL, NULL, 0);
791 err = f2fs_get_dnode_of_data(&dn, bidx, LOOKUP_NODE);
792 if (err)
793 goto out;
794
795 if (unlikely(dn.data_blkaddr == NULL_ADDR)) {
796 ClearPageUptodate(page);
797 err = -ENOENT;
798 goto put_out;
799 }
800
801 /*
802 * don't cache encrypted data into meta inode until previous dirty
803 * data were writebacked to avoid racing between GC and flush.
804 */
805 f2fs_wait_on_page_writeback(page, DATA, true, true);
806
807 f2fs_wait_on_block_writeback(inode, dn.data_blkaddr);
808
809 err = f2fs_get_node_info(fio.sbi, dn.nid, &ni);
810 if (err)
811 goto put_out;
812
813 set_summary(&sum, dn.nid, dn.ofs_in_node, ni.version);
814
815 /* read page */
816 fio.page = page;
817 fio.new_blkaddr = fio.old_blkaddr = dn.data_blkaddr;
818
819 if (lfs_mode)
820 down_write(&fio.sbi->io_order_lock);
821
822 mpage = f2fs_grab_cache_page(META_MAPPING(fio.sbi),
823 fio.old_blkaddr, false);
824 if (!mpage)
825 goto up_out;
826
827 fio.encrypted_page = mpage;
828
829 /* read source block in mpage */
830 if (!PageUptodate(mpage)) {
831 err = f2fs_submit_page_bio(&fio);
832 if (err) {
833 f2fs_put_page(mpage, 1);
834 goto up_out;
835 }
836 lock_page(mpage);
837 if (unlikely(mpage->mapping != META_MAPPING(fio.sbi) ||
838 !PageUptodate(mpage))) {
839 err = -EIO;
840 f2fs_put_page(mpage, 1);
841 goto up_out;
842 }
843 }
844
845 f2fs_allocate_data_block(fio.sbi, NULL, fio.old_blkaddr, &newaddr,
846 &sum, CURSEG_COLD_DATA, NULL, false);
847
848 fio.encrypted_page = f2fs_pagecache_get_page(META_MAPPING(fio.sbi),
849 newaddr, FGP_LOCK | FGP_CREAT, GFP_NOFS);
850 if (!fio.encrypted_page) {
851 err = -ENOMEM;
852 f2fs_put_page(mpage, 1);
853 goto recover_block;
854 }
855
856 /* write target block */
857 f2fs_wait_on_page_writeback(fio.encrypted_page, DATA, true, true);
858 memcpy(page_address(fio.encrypted_page),
859 page_address(mpage), PAGE_SIZE);
860 f2fs_put_page(mpage, 1);
861 invalidate_mapping_pages(META_MAPPING(fio.sbi),
862 fio.old_blkaddr, fio.old_blkaddr);
863
864 set_page_dirty(fio.encrypted_page);
865 if (clear_page_dirty_for_io(fio.encrypted_page))
866 dec_page_count(fio.sbi, F2FS_DIRTY_META);
867
868 set_page_writeback(fio.encrypted_page);
869 ClearPageError(page);
870
871 /* allocate block address */
872 f2fs_wait_on_page_writeback(dn.node_page, NODE, true, true);
873
874 fio.op = REQ_OP_WRITE;
875 fio.op_flags = REQ_SYNC;
876 fio.new_blkaddr = newaddr;
877 f2fs_submit_page_write(&fio);
878 if (fio.retry) {
879 err = -EAGAIN;
880 if (PageWriteback(fio.encrypted_page))
881 end_page_writeback(fio.encrypted_page);
882 goto put_page_out;
883 }
884
885 f2fs_update_iostat(fio.sbi, FS_GC_DATA_IO, F2FS_BLKSIZE);
886
887 f2fs_update_data_blkaddr(&dn, newaddr);
888 set_inode_flag(inode, FI_APPEND_WRITE);
889 if (page->index == 0)
890 set_inode_flag(inode, FI_FIRST_BLOCK_WRITTEN);
891 put_page_out:
892 f2fs_put_page(fio.encrypted_page, 1);
893 recover_block:
894 if (err)
895 f2fs_do_replace_block(fio.sbi, &sum, newaddr, fio.old_blkaddr,
896 true, true);
897 up_out:
898 if (lfs_mode)
899 up_write(&fio.sbi->io_order_lock);
900 put_out:
901 f2fs_put_dnode(&dn);
902 out:
903 f2fs_put_page(page, 1);
904 return err;
905 }
906
907 static int move_data_page(struct inode *inode, block_t bidx, int gc_type,
908 unsigned int segno, int off)
909 {
910 struct page *page;
911 int err = 0;
912
913 page = f2fs_get_lock_data_page(inode, bidx, true);
914 if (IS_ERR(page))
915 return PTR_ERR(page);
916
917 if (!check_valid_map(F2FS_I_SB(inode), segno, off)) {
918 err = -ENOENT;
919 goto out;
920 }
921
922 if (f2fs_is_atomic_file(inode)) {
923 F2FS_I(inode)->i_gc_failures[GC_FAILURE_ATOMIC]++;
924 F2FS_I_SB(inode)->skipped_atomic_files[gc_type]++;
925 err = -EAGAIN;
926 goto out;
927 }
928 if (f2fs_is_pinned_file(inode)) {
929 if (gc_type == FG_GC)
930 f2fs_pin_file_control(inode, true);
931 err = -EAGAIN;
932 goto out;
933 }
934
935 if (gc_type == BG_GC) {
936 if (PageWriteback(page)) {
937 err = -EAGAIN;
938 goto out;
939 }
940 set_page_dirty(page);
941 set_cold_data(page);
942 } else {
943 struct f2fs_io_info fio = {
944 .sbi = F2FS_I_SB(inode),
945 .ino = inode->i_ino,
946 .type = DATA,
947 .temp = COLD,
948 .op = REQ_OP_WRITE,
949 .op_flags = REQ_SYNC,
950 .old_blkaddr = NULL_ADDR,
951 .page = page,
952 .encrypted_page = NULL,
953 .need_lock = LOCK_REQ,
954 .io_type = FS_GC_DATA_IO,
955 };
956 bool is_dirty = PageDirty(page);
957
958 retry:
959 f2fs_wait_on_page_writeback(page, DATA, true, true);
960
961 set_page_dirty(page);
962 if (clear_page_dirty_for_io(page)) {
963 inode_dec_dirty_pages(inode);
964 f2fs_remove_dirty_inode(inode);
965 }
966
967 set_cold_data(page);
968
969 err = f2fs_do_write_data_page(&fio);
970 if (err) {
971 clear_cold_data(page);
972 if (err == -ENOMEM) {
973 congestion_wait(BLK_RW_ASYNC, HZ/50);
974 goto retry;
975 }
976 if (is_dirty)
977 set_page_dirty(page);
978 }
979 }
980 out:
981 f2fs_put_page(page, 1);
982 return err;
983 }
984
985 /*
986 * This function tries to get parent node of victim data block, and identifies
987 * data block validity. If the block is valid, copy that with cold status and
988 * modify parent node.
989 * If the parent node is not valid or the data block address is different,
990 * the victim data block is ignored.
991 */
992 static int gc_data_segment(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
993 struct gc_inode_list *gc_list, unsigned int segno, int gc_type)
994 {
995 struct super_block *sb = sbi->sb;
996 struct f2fs_summary *entry;
997 block_t start_addr;
998 int off;
999 int phase = 0;
1000 int submitted = 0;
1001
1002 start_addr = START_BLOCK(sbi, segno);
1003
1004 next_step:
1005 entry = sum;
1006
1007 for (off = 0; off < sbi->blocks_per_seg; off++, entry++) {
1008 struct page *data_page;
1009 struct inode *inode;
1010 struct node_info dni; /* dnode info for the data */
1011 unsigned int ofs_in_node, nofs;
1012 block_t start_bidx;
1013 nid_t nid = le32_to_cpu(entry->nid);
1014
1015 /*
1016 * stop BG_GC if there is not enough free sections.
1017 * Or, stop GC if the segment becomes fully valid caused by
1018 * race condition along with SSR block allocation.
1019 */
1020 if ((gc_type == BG_GC && has_not_enough_free_secs(sbi, 0, 0)) ||
1021 get_valid_blocks(sbi, segno, true) ==
1022 BLKS_PER_SEC(sbi))
1023 return submitted;
1024
1025 if (check_valid_map(sbi, segno, off) == 0)
1026 continue;
1027
1028 if (phase == 0) {
1029 f2fs_ra_meta_pages(sbi, NAT_BLOCK_OFFSET(nid), 1,
1030 META_NAT, true);
1031 continue;
1032 }
1033
1034 if (phase == 1) {
1035 f2fs_ra_node_page(sbi, nid);
1036 continue;
1037 }
1038
1039 /* Get an inode by ino with checking validity */
1040 if (!is_alive(sbi, entry, &dni, start_addr + off, &nofs))
1041 continue;
1042
1043 if (phase == 2) {
1044 f2fs_ra_node_page(sbi, dni.ino);
1045 continue;
1046 }
1047
1048 ofs_in_node = le16_to_cpu(entry->ofs_in_node);
1049
1050 if (phase == 3) {
1051 inode = f2fs_iget(sb, dni.ino);
1052 if (IS_ERR(inode) || is_bad_inode(inode)) {
1053 set_sbi_flag(sbi, SBI_NEED_FSCK);
1054 continue;
1055 }
1056
1057 if (!down_write_trylock(
1058 &F2FS_I(inode)->i_gc_rwsem[WRITE])) {
1059 iput(inode);
1060 sbi->skipped_gc_rwsem++;
1061 continue;
1062 }
1063
1064 start_bidx = f2fs_start_bidx_of_node(nofs, inode) +
1065 ofs_in_node;
1066
1067 if (f2fs_post_read_required(inode)) {
1068 int err = ra_data_block(inode, start_bidx);
1069
1070 up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
1071 if (err) {
1072 iput(inode);
1073 continue;
1074 }
1075 add_gc_inode(gc_list, inode);
1076 continue;
1077 }
1078
1079 data_page = f2fs_get_read_data_page(inode,
1080 start_bidx, REQ_RAHEAD, true);
1081 up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
1082 if (IS_ERR(data_page)) {
1083 iput(inode);
1084 continue;
1085 }
1086
1087 f2fs_put_page(data_page, 0);
1088 add_gc_inode(gc_list, inode);
1089 continue;
1090 }
1091
1092 /* phase 4 */
1093 inode = find_gc_inode(gc_list, dni.ino);
1094 if (inode) {
1095 struct f2fs_inode_info *fi = F2FS_I(inode);
1096 bool locked = false;
1097 int err;
1098
1099 if (S_ISREG(inode->i_mode)) {
1100 if (!down_write_trylock(&fi->i_gc_rwsem[READ]))
1101 continue;
1102 if (!down_write_trylock(
1103 &fi->i_gc_rwsem[WRITE])) {
1104 sbi->skipped_gc_rwsem++;
1105 up_write(&fi->i_gc_rwsem[READ]);
1106 continue;
1107 }
1108 locked = true;
1109
1110 /* wait for all inflight aio data */
1111 inode_dio_wait(inode);
1112 }
1113
1114 start_bidx = f2fs_start_bidx_of_node(nofs, inode)
1115 + ofs_in_node;
1116 if (f2fs_post_read_required(inode))
1117 err = move_data_block(inode, start_bidx,
1118 gc_type, segno, off);
1119 else
1120 err = move_data_page(inode, start_bidx, gc_type,
1121 segno, off);
1122
1123 if (!err && (gc_type == FG_GC ||
1124 f2fs_post_read_required(inode)))
1125 submitted++;
1126
1127 if (locked) {
1128 up_write(&fi->i_gc_rwsem[WRITE]);
1129 up_write(&fi->i_gc_rwsem[READ]);
1130 }
1131
1132 stat_inc_data_blk_count(sbi, 1, gc_type);
1133 }
1134 }
1135
1136 if (++phase < 5)
1137 goto next_step;
1138
1139 return submitted;
1140 }
1141
1142 static int __get_victim(struct f2fs_sb_info *sbi, unsigned int *victim,
1143 int gc_type)
1144 {
1145 struct sit_info *sit_i = SIT_I(sbi);
1146 int ret;
1147
1148 down_write(&sit_i->sentry_lock);
1149 ret = DIRTY_I(sbi)->v_ops->get_victim(sbi, victim, gc_type,
1150 NO_CHECK_TYPE, LFS);
1151 up_write(&sit_i->sentry_lock);
1152 return ret;
1153 }
1154
1155 static int do_garbage_collect(struct f2fs_sb_info *sbi,
1156 unsigned int start_segno,
1157 struct gc_inode_list *gc_list, int gc_type)
1158 {
1159 struct page *sum_page;
1160 struct f2fs_summary_block *sum;
1161 struct blk_plug plug;
1162 unsigned int segno = start_segno;
1163 unsigned int end_segno = start_segno + sbi->segs_per_sec;
1164 int seg_freed = 0, migrated = 0;
1165 unsigned char type = IS_DATASEG(get_seg_entry(sbi, segno)->type) ?
1166 SUM_TYPE_DATA : SUM_TYPE_NODE;
1167 int submitted = 0;
1168
1169 if (__is_large_section(sbi))
1170 end_segno = rounddown(end_segno, sbi->segs_per_sec);
1171
1172 /* readahead multi ssa blocks those have contiguous address */
1173 if (__is_large_section(sbi))
1174 f2fs_ra_meta_pages(sbi, GET_SUM_BLOCK(sbi, segno),
1175 end_segno - segno, META_SSA, true);
1176
1177 /* reference all summary page */
1178 while (segno < end_segno) {
1179 sum_page = f2fs_get_sum_page(sbi, segno++);
1180 if (IS_ERR(sum_page)) {
1181 int err = PTR_ERR(sum_page);
1182
1183 end_segno = segno - 1;
1184 for (segno = start_segno; segno < end_segno; segno++) {
1185 sum_page = find_get_page(META_MAPPING(sbi),
1186 GET_SUM_BLOCK(sbi, segno));
1187 f2fs_put_page(sum_page, 0);
1188 f2fs_put_page(sum_page, 0);
1189 }
1190 return err;
1191 }
1192 unlock_page(sum_page);
1193 }
1194
1195 blk_start_plug(&plug);
1196
1197 for (segno = start_segno; segno < end_segno; segno++) {
1198
1199 /* find segment summary of victim */
1200 sum_page = find_get_page(META_MAPPING(sbi),
1201 GET_SUM_BLOCK(sbi, segno));
1202 f2fs_put_page(sum_page, 0);
1203
1204 if (get_valid_blocks(sbi, segno, false) == 0)
1205 goto freed;
1206 if (__is_large_section(sbi) &&
1207 migrated >= sbi->migration_granularity)
1208 goto skip;
1209 if (!PageUptodate(sum_page) || unlikely(f2fs_cp_error(sbi)))
1210 goto skip;
1211
1212 sum = page_address(sum_page);
1213 if (type != GET_SUM_TYPE((&sum->footer))) {
1214 f2fs_err(sbi, "Inconsistent segment (%u) type [%d, %d] in SSA and SIT",
1215 segno, type, GET_SUM_TYPE((&sum->footer)));
1216 set_sbi_flag(sbi, SBI_NEED_FSCK);
1217 f2fs_stop_checkpoint(sbi, false);
1218 goto skip;
1219 }
1220
1221 /*
1222 * this is to avoid deadlock:
1223 * - lock_page(sum_page) - f2fs_replace_block
1224 * - check_valid_map() - down_write(sentry_lock)
1225 * - down_read(sentry_lock) - change_curseg()
1226 * - lock_page(sum_page)
1227 */
1228 if (type == SUM_TYPE_NODE)
1229 submitted += gc_node_segment(sbi, sum->entries, segno,
1230 gc_type);
1231 else
1232 submitted += gc_data_segment(sbi, sum->entries, gc_list,
1233 segno, gc_type);
1234
1235 stat_inc_seg_count(sbi, type, gc_type);
1236
1237 freed:
1238 if (gc_type == FG_GC &&
1239 get_valid_blocks(sbi, segno, false) == 0)
1240 seg_freed++;
1241 migrated++;
1242
1243 if (__is_large_section(sbi) && segno + 1 < end_segno)
1244 sbi->next_victim_seg[gc_type] = segno + 1;
1245 skip:
1246 f2fs_put_page(sum_page, 0);
1247 }
1248
1249 if (submitted)
1250 f2fs_submit_merged_write(sbi,
1251 (type == SUM_TYPE_NODE) ? NODE : DATA);
1252
1253 blk_finish_plug(&plug);
1254
1255 stat_inc_call_count(sbi->stat_info);
1256
1257 return seg_freed;
1258 }
1259
1260 int f2fs_gc(struct f2fs_sb_info *sbi, bool sync,
1261 bool background, unsigned int segno)
1262 {
1263 int gc_type = sync ? FG_GC : BG_GC;
1264 int sec_freed = 0, seg_freed = 0, total_freed = 0;
1265 int ret = 0;
1266 struct cp_control cpc;
1267 unsigned int init_segno = segno;
1268 struct gc_inode_list gc_list = {
1269 .ilist = LIST_HEAD_INIT(gc_list.ilist),
1270 .iroot = RADIX_TREE_INIT(gc_list.iroot, GFP_NOFS),
1271 };
1272 unsigned long long last_skipped = sbi->skipped_atomic_files[FG_GC];
1273 unsigned long long first_skipped;
1274 unsigned int skipped_round = 0, round = 0;
1275
1276 trace_f2fs_gc_begin(sbi->sb, sync, background,
1277 get_pages(sbi, F2FS_DIRTY_NODES),
1278 get_pages(sbi, F2FS_DIRTY_DENTS),
1279 get_pages(sbi, F2FS_DIRTY_IMETA),
1280 free_sections(sbi),
1281 free_segments(sbi),
1282 reserved_segments(sbi),
1283 prefree_segments(sbi));
1284
1285 cpc.reason = __get_cp_reason(sbi);
1286 sbi->skipped_gc_rwsem = 0;
1287 first_skipped = last_skipped;
1288 gc_more:
1289 if (unlikely(!(sbi->sb->s_flags & SB_ACTIVE))) {
1290 ret = -EINVAL;
1291 goto stop;
1292 }
1293 if (unlikely(f2fs_cp_error(sbi))) {
1294 ret = -EIO;
1295 goto stop;
1296 }
1297
1298 if (gc_type == BG_GC && has_not_enough_free_secs(sbi, 0, 0)) {
1299 /*
1300 * For example, if there are many prefree_segments below given
1301 * threshold, we can make them free by checkpoint. Then, we
1302 * secure free segments which doesn't need fggc any more.
1303 */
1304 if (prefree_segments(sbi) &&
1305 !is_sbi_flag_set(sbi, SBI_CP_DISABLED)) {
1306 ret = f2fs_write_checkpoint(sbi, &cpc);
1307 if (ret)
1308 goto stop;
1309 }
1310 if (has_not_enough_free_secs(sbi, 0, 0))
1311 gc_type = FG_GC;
1312 }
1313
1314 /* f2fs_balance_fs doesn't need to do BG_GC in critical path. */
1315 if (gc_type == BG_GC && !background) {
1316 ret = -EINVAL;
1317 goto stop;
1318 }
1319 if (!__get_victim(sbi, &segno, gc_type)) {
1320 ret = -ENODATA;
1321 goto stop;
1322 }
1323
1324 seg_freed = do_garbage_collect(sbi, segno, &gc_list, gc_type);
1325 if (gc_type == FG_GC && seg_freed == sbi->segs_per_sec)
1326 sec_freed++;
1327 total_freed += seg_freed;
1328
1329 if (gc_type == FG_GC) {
1330 if (sbi->skipped_atomic_files[FG_GC] > last_skipped ||
1331 sbi->skipped_gc_rwsem)
1332 skipped_round++;
1333 last_skipped = sbi->skipped_atomic_files[FG_GC];
1334 round++;
1335 }
1336
1337 if (gc_type == FG_GC && seg_freed)
1338 sbi->cur_victim_sec = NULL_SEGNO;
1339
1340 if (sync)
1341 goto stop;
1342
1343 if (has_not_enough_free_secs(sbi, sec_freed, 0)) {
1344 if (skipped_round <= MAX_SKIP_GC_COUNT ||
1345 skipped_round * 2 < round) {
1346 segno = NULL_SEGNO;
1347 goto gc_more;
1348 }
1349
1350 if (first_skipped < last_skipped &&
1351 (last_skipped - first_skipped) >
1352 sbi->skipped_gc_rwsem) {
1353 f2fs_drop_inmem_pages_all(sbi, true);
1354 segno = NULL_SEGNO;
1355 goto gc_more;
1356 }
1357 if (gc_type == FG_GC && !is_sbi_flag_set(sbi, SBI_CP_DISABLED))
1358 ret = f2fs_write_checkpoint(sbi, &cpc);
1359 }
1360 stop:
1361 SIT_I(sbi)->last_victim[ALLOC_NEXT] = 0;
1362 SIT_I(sbi)->last_victim[FLUSH_DEVICE] = init_segno;
1363
1364 trace_f2fs_gc_end(sbi->sb, ret, total_freed, sec_freed,
1365 get_pages(sbi, F2FS_DIRTY_NODES),
1366 get_pages(sbi, F2FS_DIRTY_DENTS),
1367 get_pages(sbi, F2FS_DIRTY_IMETA),
1368 free_sections(sbi),
1369 free_segments(sbi),
1370 reserved_segments(sbi),
1371 prefree_segments(sbi));
1372
1373 up_write(&sbi->gc_lock);
1374
1375 put_gc_inode(&gc_list);
1376
1377 if (sync && !ret)
1378 ret = sec_freed ? 0 : -EAGAIN;
1379 return ret;
1380 }
1381
1382 void f2fs_build_gc_manager(struct f2fs_sb_info *sbi)
1383 {
1384 DIRTY_I(sbi)->v_ops = &default_v_ops;
1385
1386 sbi->gc_pin_file_threshold = DEF_GC_FAILED_PINNED_FILES;
1387
1388 /* give warm/cold data area from slower device */
1389 if (f2fs_is_multi_device(sbi) && !__is_large_section(sbi))
1390 SIT_I(sbi)->last_victim[ALLOC_NEXT] =
1391 GET_SEGNO(sbi, FDEV(0).end_blk) + 1;
1392 }
1393
1394 static int free_segment_range(struct f2fs_sb_info *sbi, unsigned int start,
1395 unsigned int end)
1396 {
1397 int type;
1398 unsigned int segno, next_inuse;
1399 int err = 0;
1400
1401 /* Move out cursegs from the target range */
1402 for (type = CURSEG_HOT_DATA; type < NR_CURSEG_TYPE; type++)
1403 allocate_segment_for_resize(sbi, type, start, end);
1404
1405 /* do GC to move out valid blocks in the range */
1406 for (segno = start; segno <= end; segno += sbi->segs_per_sec) {
1407 struct gc_inode_list gc_list = {
1408 .ilist = LIST_HEAD_INIT(gc_list.ilist),
1409 .iroot = RADIX_TREE_INIT(gc_list.iroot, GFP_NOFS),
1410 };
1411
1412 down_write(&sbi->gc_lock);
1413 do_garbage_collect(sbi, segno, &gc_list, FG_GC);
1414 up_write(&sbi->gc_lock);
1415 put_gc_inode(&gc_list);
1416
1417 if (get_valid_blocks(sbi, segno, true))
1418 return -EAGAIN;
1419 }
1420
1421 err = f2fs_sync_fs(sbi->sb, 1);
1422 if (err)
1423 return err;
1424
1425 next_inuse = find_next_inuse(FREE_I(sbi), end + 1, start);
1426 if (next_inuse <= end) {
1427 f2fs_err(sbi, "segno %u should be free but still inuse!",
1428 next_inuse);
1429 f2fs_bug_on(sbi, 1);
1430 }
1431 return err;
1432 }
1433
1434 static void update_sb_metadata(struct f2fs_sb_info *sbi, int secs)
1435 {
1436 struct f2fs_super_block *raw_sb = F2FS_RAW_SUPER(sbi);
1437 int section_count;
1438 int segment_count;
1439 int segment_count_main;
1440 long long block_count;
1441 int segs = secs * sbi->segs_per_sec;
1442
1443 down_write(&sbi->sb_lock);
1444
1445 section_count = le32_to_cpu(raw_sb->section_count);
1446 segment_count = le32_to_cpu(raw_sb->segment_count);
1447 segment_count_main = le32_to_cpu(raw_sb->segment_count_main);
1448 block_count = le64_to_cpu(raw_sb->block_count);
1449
1450 raw_sb->section_count = cpu_to_le32(section_count + secs);
1451 raw_sb->segment_count = cpu_to_le32(segment_count + segs);
1452 raw_sb->segment_count_main = cpu_to_le32(segment_count_main + segs);
1453 raw_sb->block_count = cpu_to_le64(block_count +
1454 (long long)segs * sbi->blocks_per_seg);
1455 if (f2fs_is_multi_device(sbi)) {
1456 int last_dev = sbi->s_ndevs - 1;
1457 int dev_segs =
1458 le32_to_cpu(raw_sb->devs[last_dev].total_segments);
1459
1460 raw_sb->devs[last_dev].total_segments =
1461 cpu_to_le32(dev_segs + segs);
1462 }
1463
1464 up_write(&sbi->sb_lock);
1465 }
1466
1467 static void update_fs_metadata(struct f2fs_sb_info *sbi, int secs)
1468 {
1469 int segs = secs * sbi->segs_per_sec;
1470 long long blks = (long long)segs * sbi->blocks_per_seg;
1471 long long user_block_count =
1472 le64_to_cpu(F2FS_CKPT(sbi)->user_block_count);
1473
1474 SM_I(sbi)->segment_count = (int)SM_I(sbi)->segment_count + segs;
1475 MAIN_SEGS(sbi) = (int)MAIN_SEGS(sbi) + segs;
1476 FREE_I(sbi)->free_sections = (int)FREE_I(sbi)->free_sections + secs;
1477 FREE_I(sbi)->free_segments = (int)FREE_I(sbi)->free_segments + segs;
1478 F2FS_CKPT(sbi)->user_block_count = cpu_to_le64(user_block_count + blks);
1479
1480 if (f2fs_is_multi_device(sbi)) {
1481 int last_dev = sbi->s_ndevs - 1;
1482
1483 FDEV(last_dev).total_segments =
1484 (int)FDEV(last_dev).total_segments + segs;
1485 FDEV(last_dev).end_blk =
1486 (long long)FDEV(last_dev).end_blk + blks;
1487 #ifdef CONFIG_BLK_DEV_ZONED
1488 FDEV(last_dev).nr_blkz = (int)FDEV(last_dev).nr_blkz +
1489 (int)(blks >> sbi->log_blocks_per_blkz);
1490 #endif
1491 }
1492 }
1493
1494 int f2fs_resize_fs(struct f2fs_sb_info *sbi, __u64 block_count)
1495 {
1496 __u64 old_block_count, shrunk_blocks;
1497 unsigned int secs;
1498 int gc_mode, gc_type;
1499 int err = 0;
1500 __u32 rem;
1501
1502 old_block_count = le64_to_cpu(F2FS_RAW_SUPER(sbi)->block_count);
1503 if (block_count > old_block_count)
1504 return -EINVAL;
1505
1506 if (f2fs_is_multi_device(sbi)) {
1507 int last_dev = sbi->s_ndevs - 1;
1508 __u64 last_segs = FDEV(last_dev).total_segments;
1509
1510 if (block_count + last_segs * sbi->blocks_per_seg <=
1511 old_block_count)
1512 return -EINVAL;
1513 }
1514
1515 /* new fs size should align to section size */
1516 div_u64_rem(block_count, BLKS_PER_SEC(sbi), &rem);
1517 if (rem)
1518 return -EINVAL;
1519
1520 if (block_count == old_block_count)
1521 return 0;
1522
1523 if (is_sbi_flag_set(sbi, SBI_NEED_FSCK)) {
1524 f2fs_err(sbi, "Should run fsck to repair first.");
1525 return -EFSCORRUPTED;
1526 }
1527
1528 if (test_opt(sbi, DISABLE_CHECKPOINT)) {
1529 f2fs_err(sbi, "Checkpoint should be enabled.");
1530 return -EINVAL;
1531 }
1532
1533 freeze_bdev(sbi->sb->s_bdev);
1534
1535 shrunk_blocks = old_block_count - block_count;
1536 secs = div_u64(shrunk_blocks, BLKS_PER_SEC(sbi));
1537 spin_lock(&sbi->stat_lock);
1538 if (shrunk_blocks + valid_user_blocks(sbi) +
1539 sbi->current_reserved_blocks + sbi->unusable_block_count +
1540 F2FS_OPTION(sbi).root_reserved_blocks > sbi->user_block_count)
1541 err = -ENOSPC;
1542 else
1543 sbi->user_block_count -= shrunk_blocks;
1544 spin_unlock(&sbi->stat_lock);
1545 if (err) {
1546 thaw_bdev(sbi->sb->s_bdev, sbi->sb);
1547 return err;
1548 }
1549
1550 mutex_lock(&sbi->resize_mutex);
1551 set_sbi_flag(sbi, SBI_IS_RESIZEFS);
1552
1553 mutex_lock(&DIRTY_I(sbi)->seglist_lock);
1554
1555 MAIN_SECS(sbi) -= secs;
1556
1557 for (gc_mode = 0; gc_mode < MAX_GC_POLICY; gc_mode++)
1558 if (SIT_I(sbi)->last_victim[gc_mode] >=
1559 MAIN_SECS(sbi) * sbi->segs_per_sec)
1560 SIT_I(sbi)->last_victim[gc_mode] = 0;
1561
1562 for (gc_type = BG_GC; gc_type <= FG_GC; gc_type++)
1563 if (sbi->next_victim_seg[gc_type] >=
1564 MAIN_SECS(sbi) * sbi->segs_per_sec)
1565 sbi->next_victim_seg[gc_type] = NULL_SEGNO;
1566
1567 mutex_unlock(&DIRTY_I(sbi)->seglist_lock);
1568
1569 err = free_segment_range(sbi, MAIN_SECS(sbi) * sbi->segs_per_sec,
1570 MAIN_SEGS(sbi) - 1);
1571 if (err)
1572 goto out;
1573
1574 update_sb_metadata(sbi, -secs);
1575
1576 err = f2fs_commit_super(sbi, false);
1577 if (err) {
1578 update_sb_metadata(sbi, secs);
1579 goto out;
1580 }
1581
1582 mutex_lock(&sbi->cp_mutex);
1583 update_fs_metadata(sbi, -secs);
1584 clear_sbi_flag(sbi, SBI_IS_RESIZEFS);
1585 set_sbi_flag(sbi, SBI_IS_DIRTY);
1586 mutex_unlock(&sbi->cp_mutex);
1587
1588 err = f2fs_sync_fs(sbi->sb, 1);
1589 if (err) {
1590 mutex_lock(&sbi->cp_mutex);
1591 update_fs_metadata(sbi, secs);
1592 mutex_unlock(&sbi->cp_mutex);
1593 update_sb_metadata(sbi, secs);
1594 f2fs_commit_super(sbi, false);
1595 }
1596 out:
1597 if (err) {
1598 set_sbi_flag(sbi, SBI_NEED_FSCK);
1599 f2fs_err(sbi, "resize_fs failed, should run fsck to repair!");
1600
1601 MAIN_SECS(sbi) += secs;
1602 spin_lock(&sbi->stat_lock);
1603 sbi->user_block_count += shrunk_blocks;
1604 spin_unlock(&sbi->stat_lock);
1605 }
1606 clear_sbi_flag(sbi, SBI_IS_RESIZEFS);
1607 mutex_unlock(&sbi->resize_mutex);
1608 thaw_bdev(sbi->sb->s_bdev, sbi->sb);
1609 return err;
1610 }
Linux with added FPC-III support