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blk-mq: always free hctx after request queue is freed
[linux/fpc-iii.git] / fs / f2fs / gc.c
blob195cf0f9d9ef90794e2b9a80649729511ea4ab60
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(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 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);
101 do_gc:
102 stat_inc_bggc_count(sbi);
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 = MAIN_SEGS(sbi);
315 unsigned int nsearched = 0;
316
317 mutex_lock(&dirty_i->seglist_lock);
318
319 p.alloc_mode = alloc_mode;
320 select_policy(sbi, gc_type, type, &p);
321
322 p.min_segno = NULL_SEGNO;
323 p.min_cost = get_max_cost(sbi, &p);
324
325 if (*result != NULL_SEGNO) {
326 if (get_valid_blocks(sbi, *result, false) &&
327 !sec_usage_check(sbi, GET_SEC_FROM_SEG(sbi, *result)))
328 p.min_segno = *result;
329 goto out;
330 }
331
332 if (p.max_search == 0)
333 goto out;
334
335 if (__is_large_section(sbi) && p.alloc_mode == LFS) {
336 if (sbi->next_victim_seg[BG_GC] != NULL_SEGNO) {
337 p.min_segno = sbi->next_victim_seg[BG_GC];
338 *result = p.min_segno;
339 sbi->next_victim_seg[BG_GC] = NULL_SEGNO;
340 goto got_result;
341 }
342 if (gc_type == FG_GC &&
343 sbi->next_victim_seg[FG_GC] != NULL_SEGNO) {
344 p.min_segno = sbi->next_victim_seg[FG_GC];
345 *result = p.min_segno;
346 sbi->next_victim_seg[FG_GC] = NULL_SEGNO;
347 goto got_result;
348 }
349 }
350
351 last_victim = sm->last_victim[p.gc_mode];
352 if (p.alloc_mode == LFS && gc_type == FG_GC) {
353 p.min_segno = check_bg_victims(sbi);
354 if (p.min_segno != NULL_SEGNO)
355 goto got_it;
356 }
357
358 while (1) {
359 unsigned long cost;
360 unsigned int segno;
361
362 segno = find_next_bit(p.dirty_segmap, last_segment, p.offset);
363 if (segno >= last_segment) {
364 if (sm->last_victim[p.gc_mode]) {
365 last_segment =
366 sm->last_victim[p.gc_mode];
367 sm->last_victim[p.gc_mode] = 0;
368 p.offset = 0;
369 continue;
370 }
371 break;
372 }
373
374 p.offset = segno + p.ofs_unit;
375 if (p.ofs_unit > 1) {
376 p.offset -= segno % p.ofs_unit;
377 nsearched += count_bits(p.dirty_segmap,
378 p.offset - p.ofs_unit,
379 p.ofs_unit);
380 } else {
381 nsearched++;
382 }
383
384 secno = GET_SEC_FROM_SEG(sbi, segno);
385
386 if (sec_usage_check(sbi, secno))
387 goto next;
388 /* Don't touch checkpointed data */
389 if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED) &&
390 get_ckpt_valid_blocks(sbi, segno)))
391 goto next;
392 if (gc_type == BG_GC && test_bit(secno, dirty_i->victim_secmap))
393 goto next;
394
395 cost = get_gc_cost(sbi, segno, &p);
396
397 if (p.min_cost > cost) {
398 p.min_segno = segno;
399 p.min_cost = cost;
400 }
401 next:
402 if (nsearched >= p.max_search) {
403 if (!sm->last_victim[p.gc_mode] && segno <= last_victim)
404 sm->last_victim[p.gc_mode] = last_victim + 1;
405 else
406 sm->last_victim[p.gc_mode] = segno + 1;
407 sm->last_victim[p.gc_mode] %= MAIN_SEGS(sbi);
408 break;
409 }
410 }
411 if (p.min_segno != NULL_SEGNO) {
412 got_it:
413 *result = (p.min_segno / p.ofs_unit) * p.ofs_unit;
414 got_result:
415 if (p.alloc_mode == LFS) {
416 secno = GET_SEC_FROM_SEG(sbi, p.min_segno);
417 if (gc_type == FG_GC)
418 sbi->cur_victim_sec = secno;
419 else
420 set_bit(secno, dirty_i->victim_secmap);
421 }
422
423 }
424 out:
425 if (p.min_segno != NULL_SEGNO)
426 trace_f2fs_get_victim(sbi->sb, type, gc_type, &p,
427 sbi->cur_victim_sec,
428 prefree_segments(sbi), free_segments(sbi));
429 mutex_unlock(&dirty_i->seglist_lock);
430
431 return (p.min_segno == NULL_SEGNO) ? 0 : 1;
432 }
433
434 static const struct victim_selection default_v_ops = {
435 .get_victim = get_victim_by_default,
436 };
437
438 static struct inode *find_gc_inode(struct gc_inode_list *gc_list, nid_t ino)
439 {
440 struct inode_entry *ie;
441
442 ie = radix_tree_lookup(&gc_list->iroot, ino);
443 if (ie)
444 return ie->inode;
445 return NULL;
446 }
447
448 static void add_gc_inode(struct gc_inode_list *gc_list, struct inode *inode)
449 {
450 struct inode_entry *new_ie;
451
452 if (inode == find_gc_inode(gc_list, inode->i_ino)) {
453 iput(inode);
454 return;
455 }
456 new_ie = f2fs_kmem_cache_alloc(f2fs_inode_entry_slab, GFP_NOFS);
457 new_ie->inode = inode;
458
459 f2fs_radix_tree_insert(&gc_list->iroot, inode->i_ino, new_ie);
460 list_add_tail(&new_ie->list, &gc_list->ilist);
461 }
462
463 static void put_gc_inode(struct gc_inode_list *gc_list)
464 {
465 struct inode_entry *ie, *next_ie;
466 list_for_each_entry_safe(ie, next_ie, &gc_list->ilist, list) {
467 radix_tree_delete(&gc_list->iroot, ie->inode->i_ino);
468 iput(ie->inode);
469 list_del(&ie->list);
470 kmem_cache_free(f2fs_inode_entry_slab, ie);
471 }
472 }
473
474 static int check_valid_map(struct f2fs_sb_info *sbi,
475 unsigned int segno, int offset)
476 {
477 struct sit_info *sit_i = SIT_I(sbi);
478 struct seg_entry *sentry;
479 int ret;
480
481 down_read(&sit_i->sentry_lock);
482 sentry = get_seg_entry(sbi, segno);
483 ret = f2fs_test_bit(offset, sentry->cur_valid_map);
484 up_read(&sit_i->sentry_lock);
485 return ret;
486 }
487
488 /*
489 * This function compares node address got in summary with that in NAT.
490 * On validity, copy that node with cold status, otherwise (invalid node)
491 * ignore that.
492 */
493 static int gc_node_segment(struct f2fs_sb_info *sbi,
494 struct f2fs_summary *sum, unsigned int segno, int gc_type)
495 {
496 struct f2fs_summary *entry;
497 block_t start_addr;
498 int off;
499 int phase = 0;
500 bool fggc = (gc_type == FG_GC);
501 int submitted = 0;
502
503 start_addr = START_BLOCK(sbi, segno);
504
505 next_step:
506 entry = sum;
507
508 if (fggc && phase == 2)
509 atomic_inc(&sbi->wb_sync_req[NODE]);
510
511 for (off = 0; off < sbi->blocks_per_seg; off++, entry++) {
512 nid_t nid = le32_to_cpu(entry->nid);
513 struct page *node_page;
514 struct node_info ni;
515 int err;
516
517 /* stop BG_GC if there is not enough free sections. */
518 if (gc_type == BG_GC && has_not_enough_free_secs(sbi, 0, 0))
519 return submitted;
520
521 if (check_valid_map(sbi, segno, off) == 0)
522 continue;
523
524 if (phase == 0) {
525 f2fs_ra_meta_pages(sbi, NAT_BLOCK_OFFSET(nid), 1,
526 META_NAT, true);
527 continue;
528 }
529
530 if (phase == 1) {
531 f2fs_ra_node_page(sbi, nid);
532 continue;
533 }
534
535 /* phase == 2 */
536 node_page = f2fs_get_node_page(sbi, nid);
537 if (IS_ERR(node_page))
538 continue;
539
540 /* block may become invalid during f2fs_get_node_page */
541 if (check_valid_map(sbi, segno, off) == 0) {
542 f2fs_put_page(node_page, 1);
543 continue;
544 }
545
546 if (f2fs_get_node_info(sbi, nid, &ni)) {
547 f2fs_put_page(node_page, 1);
548 continue;
549 }
550
551 if (ni.blk_addr != start_addr + off) {
552 f2fs_put_page(node_page, 1);
553 continue;
554 }
555
556 err = f2fs_move_node_page(node_page, gc_type);
557 if (!err && gc_type == FG_GC)
558 submitted++;
559 stat_inc_node_blk_count(sbi, 1, gc_type);
560 }
561
562 if (++phase < 3)
563 goto next_step;
564
565 if (fggc)
566 atomic_dec(&sbi->wb_sync_req[NODE]);
567 return submitted;
568 }
569
570 /*
571 * Calculate start block index indicating the given node offset.
572 * Be careful, caller should give this node offset only indicating direct node
573 * blocks. If any node offsets, which point the other types of node blocks such
574 * as indirect or double indirect node blocks, are given, it must be a caller's
575 * bug.
576 */
577 block_t f2fs_start_bidx_of_node(unsigned int node_ofs, struct inode *inode)
578 {
579 unsigned int indirect_blks = 2 * NIDS_PER_BLOCK + 4;
580 unsigned int bidx;
581
582 if (node_ofs == 0)
583 return 0;
584
585 if (node_ofs <= 2) {
586 bidx = node_ofs - 1;
587 } else if (node_ofs <= indirect_blks) {
588 int dec = (node_ofs - 4) / (NIDS_PER_BLOCK + 1);
589 bidx = node_ofs - 2 - dec;
590 } else {
591 int dec = (node_ofs - indirect_blks - 3) / (NIDS_PER_BLOCK + 1);
592 bidx = node_ofs - 5 - dec;
593 }
594 return bidx * ADDRS_PER_BLOCK + ADDRS_PER_INODE(inode);
595 }
596
597 static bool is_alive(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
598 struct node_info *dni, block_t blkaddr, unsigned int *nofs)
599 {
600 struct page *node_page;
601 nid_t nid;
602 unsigned int ofs_in_node;
603 block_t source_blkaddr;
604
605 nid = le32_to_cpu(sum->nid);
606 ofs_in_node = le16_to_cpu(sum->ofs_in_node);
607
608 node_page = f2fs_get_node_page(sbi, nid);
609 if (IS_ERR(node_page))
610 return false;
611
612 if (f2fs_get_node_info(sbi, nid, dni)) {
613 f2fs_put_page(node_page, 1);
614 return false;
615 }
616
617 if (sum->version != dni->version) {
618 f2fs_msg(sbi->sb, KERN_WARNING,
619 "%s: valid data with mismatched node version.",
620 __func__);
621 set_sbi_flag(sbi, SBI_NEED_FSCK);
622 }
623
624 *nofs = ofs_of_node(node_page);
625 source_blkaddr = datablock_addr(NULL, node_page, ofs_in_node);
626 f2fs_put_page(node_page, 1);
627
628 if (source_blkaddr != blkaddr)
629 return false;
630 return true;
631 }
632
633 static int ra_data_block(struct inode *inode, pgoff_t index)
634 {
635 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
636 struct address_space *mapping = inode->i_mapping;
637 struct dnode_of_data dn;
638 struct page *page;
639 struct extent_info ei = {0, 0, 0};
640 struct f2fs_io_info fio = {
641 .sbi = sbi,
642 .ino = inode->i_ino,
643 .type = DATA,
644 .temp = COLD,
645 .op = REQ_OP_READ,
646 .op_flags = 0,
647 .encrypted_page = NULL,
648 .in_list = false,
649 .retry = false,
650 };
651 int err;
652
653 page = f2fs_grab_cache_page(mapping, index, true);
654 if (!page)
655 return -ENOMEM;
656
657 if (f2fs_lookup_extent_cache(inode, index, &ei)) {
658 dn.data_blkaddr = ei.blk + index - ei.fofs;
659 goto got_it;
660 }
661
662 set_new_dnode(&dn, inode, NULL, NULL, 0);
663 err = f2fs_get_dnode_of_data(&dn, index, LOOKUP_NODE);
664 if (err)
665 goto put_page;
666 f2fs_put_dnode(&dn);
667
668 if (unlikely(!f2fs_is_valid_blkaddr(sbi, dn.data_blkaddr,
669 DATA_GENERIC))) {
670 err = -EFAULT;
671 goto put_page;
672 }
673 got_it:
674 /* read page */
675 fio.page = page;
676 fio.new_blkaddr = fio.old_blkaddr = dn.data_blkaddr;
677
678 /*
679 * don't cache encrypted data into meta inode until previous dirty
680 * data were writebacked to avoid racing between GC and flush.
681 */
682 f2fs_wait_on_page_writeback(page, DATA, true, true);
683
684 f2fs_wait_on_block_writeback(inode, dn.data_blkaddr);
685
686 fio.encrypted_page = f2fs_pagecache_get_page(META_MAPPING(sbi),
687 dn.data_blkaddr,
688 FGP_LOCK | FGP_CREAT, GFP_NOFS);
689 if (!fio.encrypted_page) {
690 err = -ENOMEM;
691 goto put_page;
692 }
693
694 err = f2fs_submit_page_bio(&fio);
695 if (err)
696 goto put_encrypted_page;
697 f2fs_put_page(fio.encrypted_page, 0);
698 f2fs_put_page(page, 1);
699 return 0;
700 put_encrypted_page:
701 f2fs_put_page(fio.encrypted_page, 1);
702 put_page:
703 f2fs_put_page(page, 1);
704 return err;
705 }
706
707 /*
708 * Move data block via META_MAPPING while keeping locked data page.
709 * This can be used to move blocks, aka LBAs, directly on disk.
710 */
711 static int move_data_block(struct inode *inode, block_t bidx,
712 int gc_type, unsigned int segno, int off)
713 {
714 struct f2fs_io_info fio = {
715 .sbi = F2FS_I_SB(inode),
716 .ino = inode->i_ino,
717 .type = DATA,
718 .temp = COLD,
719 .op = REQ_OP_READ,
720 .op_flags = 0,
721 .encrypted_page = NULL,
722 .in_list = false,
723 .retry = false,
724 };
725 struct dnode_of_data dn;
726 struct f2fs_summary sum;
727 struct node_info ni;
728 struct page *page, *mpage;
729 block_t newaddr;
730 int err = 0;
731 bool lfs_mode = test_opt(fio.sbi, LFS);
732
733 /* do not read out */
734 page = f2fs_grab_cache_page(inode->i_mapping, bidx, false);
735 if (!page)
736 return -ENOMEM;
737
738 if (!check_valid_map(F2FS_I_SB(inode), segno, off)) {
739 err = -ENOENT;
740 goto out;
741 }
742
743 if (f2fs_is_atomic_file(inode)) {
744 F2FS_I(inode)->i_gc_failures[GC_FAILURE_ATOMIC]++;
745 F2FS_I_SB(inode)->skipped_atomic_files[gc_type]++;
746 err = -EAGAIN;
747 goto out;
748 }
749
750 if (f2fs_is_pinned_file(inode)) {
751 f2fs_pin_file_control(inode, true);
752 err = -EAGAIN;
753 goto out;
754 }
755
756 set_new_dnode(&dn, inode, NULL, NULL, 0);
757 err = f2fs_get_dnode_of_data(&dn, bidx, LOOKUP_NODE);
758 if (err)
759 goto out;
760
761 if (unlikely(dn.data_blkaddr == NULL_ADDR)) {
762 ClearPageUptodate(page);
763 err = -ENOENT;
764 goto put_out;
765 }
766
767 /*
768 * don't cache encrypted data into meta inode until previous dirty
769 * data were writebacked to avoid racing between GC and flush.
770 */
771 f2fs_wait_on_page_writeback(page, DATA, true, true);
772
773 f2fs_wait_on_block_writeback(inode, dn.data_blkaddr);
774
775 err = f2fs_get_node_info(fio.sbi, dn.nid, &ni);
776 if (err)
777 goto put_out;
778
779 set_summary(&sum, dn.nid, dn.ofs_in_node, ni.version);
780
781 /* read page */
782 fio.page = page;
783 fio.new_blkaddr = fio.old_blkaddr = dn.data_blkaddr;
784
785 if (lfs_mode)
786 down_write(&fio.sbi->io_order_lock);
787
788 f2fs_allocate_data_block(fio.sbi, NULL, fio.old_blkaddr, &newaddr,
789 &sum, CURSEG_COLD_DATA, NULL, false);
790
791 fio.encrypted_page = f2fs_pagecache_get_page(META_MAPPING(fio.sbi),
792 newaddr, FGP_LOCK | FGP_CREAT, GFP_NOFS);
793 if (!fio.encrypted_page) {
794 err = -ENOMEM;
795 goto recover_block;
796 }
797
798 mpage = f2fs_pagecache_get_page(META_MAPPING(fio.sbi),
799 fio.old_blkaddr, FGP_LOCK, GFP_NOFS);
800 if (mpage) {
801 bool updated = false;
802
803 if (PageUptodate(mpage)) {
804 memcpy(page_address(fio.encrypted_page),
805 page_address(mpage), PAGE_SIZE);
806 updated = true;
807 }
808 f2fs_put_page(mpage, 1);
809 invalidate_mapping_pages(META_MAPPING(fio.sbi),
810 fio.old_blkaddr, fio.old_blkaddr);
811 if (updated)
812 goto write_page;
813 }
814
815 err = f2fs_submit_page_bio(&fio);
816 if (err)
817 goto put_page_out;
818
819 /* write page */
820 lock_page(fio.encrypted_page);
821
822 if (unlikely(fio.encrypted_page->mapping != META_MAPPING(fio.sbi))) {
823 err = -EIO;
824 goto put_page_out;
825 }
826 if (unlikely(!PageUptodate(fio.encrypted_page))) {
827 err = -EIO;
828 goto put_page_out;
829 }
830
831 write_page:
832 f2fs_wait_on_page_writeback(fio.encrypted_page, DATA, true, true);
833 set_page_dirty(fio.encrypted_page);
834 if (clear_page_dirty_for_io(fio.encrypted_page))
835 dec_page_count(fio.sbi, F2FS_DIRTY_META);
836
837 set_page_writeback(fio.encrypted_page);
838 ClearPageError(page);
839
840 /* allocate block address */
841 f2fs_wait_on_page_writeback(dn.node_page, NODE, true, true);
842
843 fio.op = REQ_OP_WRITE;
844 fio.op_flags = REQ_SYNC;
845 fio.new_blkaddr = newaddr;
846 f2fs_submit_page_write(&fio);
847 if (fio.retry) {
848 err = -EAGAIN;
849 if (PageWriteback(fio.encrypted_page))
850 end_page_writeback(fio.encrypted_page);
851 goto put_page_out;
852 }
853
854 f2fs_update_iostat(fio.sbi, FS_GC_DATA_IO, F2FS_BLKSIZE);
855
856 f2fs_update_data_blkaddr(&dn, newaddr);
857 set_inode_flag(inode, FI_APPEND_WRITE);
858 if (page->index == 0)
859 set_inode_flag(inode, FI_FIRST_BLOCK_WRITTEN);
860 put_page_out:
861 f2fs_put_page(fio.encrypted_page, 1);
862 recover_block:
863 if (lfs_mode)
864 up_write(&fio.sbi->io_order_lock);
865 if (err)
866 f2fs_do_replace_block(fio.sbi, &sum, newaddr, fio.old_blkaddr,
867 true, true);
868 put_out:
869 f2fs_put_dnode(&dn);
870 out:
871 f2fs_put_page(page, 1);
872 return err;
873 }
874
875 static int move_data_page(struct inode *inode, block_t bidx, int gc_type,
876 unsigned int segno, int off)
877 {
878 struct page *page;
879 int err = 0;
880
881 page = f2fs_get_lock_data_page(inode, bidx, true);
882 if (IS_ERR(page))
883 return PTR_ERR(page);
884
885 if (!check_valid_map(F2FS_I_SB(inode), segno, off)) {
886 err = -ENOENT;
887 goto out;
888 }
889
890 if (f2fs_is_atomic_file(inode)) {
891 F2FS_I(inode)->i_gc_failures[GC_FAILURE_ATOMIC]++;
892 F2FS_I_SB(inode)->skipped_atomic_files[gc_type]++;
893 err = -EAGAIN;
894 goto out;
895 }
896 if (f2fs_is_pinned_file(inode)) {
897 if (gc_type == FG_GC)
898 f2fs_pin_file_control(inode, true);
899 err = -EAGAIN;
900 goto out;
901 }
902
903 if (gc_type == BG_GC) {
904 if (PageWriteback(page)) {
905 err = -EAGAIN;
906 goto out;
907 }
908 set_page_dirty(page);
909 set_cold_data(page);
910 } else {
911 struct f2fs_io_info fio = {
912 .sbi = F2FS_I_SB(inode),
913 .ino = inode->i_ino,
914 .type = DATA,
915 .temp = COLD,
916 .op = REQ_OP_WRITE,
917 .op_flags = REQ_SYNC,
918 .old_blkaddr = NULL_ADDR,
919 .page = page,
920 .encrypted_page = NULL,
921 .need_lock = LOCK_REQ,
922 .io_type = FS_GC_DATA_IO,
923 };
924 bool is_dirty = PageDirty(page);
925
926 retry:
927 f2fs_wait_on_page_writeback(page, DATA, true, true);
928
929 set_page_dirty(page);
930 if (clear_page_dirty_for_io(page)) {
931 inode_dec_dirty_pages(inode);
932 f2fs_remove_dirty_inode(inode);
933 }
934
935 set_cold_data(page);
936
937 err = f2fs_do_write_data_page(&fio);
938 if (err) {
939 clear_cold_data(page);
940 if (err == -ENOMEM) {
941 congestion_wait(BLK_RW_ASYNC, HZ/50);
942 goto retry;
943 }
944 if (is_dirty)
945 set_page_dirty(page);
946 }
947 }
948 out:
949 f2fs_put_page(page, 1);
950 return err;
951 }
952
953 /*
954 * This function tries to get parent node of victim data block, and identifies
955 * data block validity. If the block is valid, copy that with cold status and
956 * modify parent node.
957 * If the parent node is not valid or the data block address is different,
958 * the victim data block is ignored.
959 */
960 static int gc_data_segment(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
961 struct gc_inode_list *gc_list, unsigned int segno, int gc_type)
962 {
963 struct super_block *sb = sbi->sb;
964 struct f2fs_summary *entry;
965 block_t start_addr;
966 int off;
967 int phase = 0;
968 int submitted = 0;
969
970 start_addr = START_BLOCK(sbi, segno);
971
972 next_step:
973 entry = sum;
974
975 for (off = 0; off < sbi->blocks_per_seg; off++, entry++) {
976 struct page *data_page;
977 struct inode *inode;
978 struct node_info dni; /* dnode info for the data */
979 unsigned int ofs_in_node, nofs;
980 block_t start_bidx;
981 nid_t nid = le32_to_cpu(entry->nid);
982
983 /* stop BG_GC if there is not enough free sections. */
984 if (gc_type == BG_GC && has_not_enough_free_secs(sbi, 0, 0))
985 return submitted;
986
987 if (check_valid_map(sbi, segno, off) == 0)
988 continue;
989
990 if (phase == 0) {
991 f2fs_ra_meta_pages(sbi, NAT_BLOCK_OFFSET(nid), 1,
992 META_NAT, true);
993 continue;
994 }
995
996 if (phase == 1) {
997 f2fs_ra_node_page(sbi, nid);
998 continue;
999 }
1000
1001 /* Get an inode by ino with checking validity */
1002 if (!is_alive(sbi, entry, &dni, start_addr + off, &nofs))
1003 continue;
1004
1005 if (phase == 2) {
1006 f2fs_ra_node_page(sbi, dni.ino);
1007 continue;
1008 }
1009
1010 ofs_in_node = le16_to_cpu(entry->ofs_in_node);
1011
1012 if (phase == 3) {
1013 inode = f2fs_iget(sb, dni.ino);
1014 if (IS_ERR(inode) || is_bad_inode(inode))
1015 continue;
1016
1017 if (!down_write_trylock(
1018 &F2FS_I(inode)->i_gc_rwsem[WRITE])) {
1019 iput(inode);
1020 sbi->skipped_gc_rwsem++;
1021 continue;
1022 }
1023
1024 start_bidx = f2fs_start_bidx_of_node(nofs, inode) +
1025 ofs_in_node;
1026
1027 if (f2fs_post_read_required(inode)) {
1028 int err = ra_data_block(inode, start_bidx);
1029
1030 up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
1031 if (err) {
1032 iput(inode);
1033 continue;
1034 }
1035 add_gc_inode(gc_list, inode);
1036 continue;
1037 }
1038
1039 data_page = f2fs_get_read_data_page(inode,
1040 start_bidx, REQ_RAHEAD, true);
1041 up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
1042 if (IS_ERR(data_page)) {
1043 iput(inode);
1044 continue;
1045 }
1046
1047 f2fs_put_page(data_page, 0);
1048 add_gc_inode(gc_list, inode);
1049 continue;
1050 }
1051
1052 /* phase 4 */
1053 inode = find_gc_inode(gc_list, dni.ino);
1054 if (inode) {
1055 struct f2fs_inode_info *fi = F2FS_I(inode);
1056 bool locked = false;
1057 int err;
1058
1059 if (S_ISREG(inode->i_mode)) {
1060 if (!down_write_trylock(&fi->i_gc_rwsem[READ]))
1061 continue;
1062 if (!down_write_trylock(
1063 &fi->i_gc_rwsem[WRITE])) {
1064 sbi->skipped_gc_rwsem++;
1065 up_write(&fi->i_gc_rwsem[READ]);
1066 continue;
1067 }
1068 locked = true;
1069
1070 /* wait for all inflight aio data */
1071 inode_dio_wait(inode);
1072 }
1073
1074 start_bidx = f2fs_start_bidx_of_node(nofs, inode)
1075 + ofs_in_node;
1076 if (f2fs_post_read_required(inode))
1077 err = move_data_block(inode, start_bidx,
1078 gc_type, segno, off);
1079 else
1080 err = move_data_page(inode, start_bidx, gc_type,
1081 segno, off);
1082
1083 if (!err && (gc_type == FG_GC ||
1084 f2fs_post_read_required(inode)))
1085 submitted++;
1086
1087 if (locked) {
1088 up_write(&fi->i_gc_rwsem[WRITE]);
1089 up_write(&fi->i_gc_rwsem[READ]);
1090 }
1091
1092 stat_inc_data_blk_count(sbi, 1, gc_type);
1093 }
1094 }
1095
1096 if (++phase < 5)
1097 goto next_step;
1098
1099 return submitted;
1100 }
1101
1102 static int __get_victim(struct f2fs_sb_info *sbi, unsigned int *victim,
1103 int gc_type)
1104 {
1105 struct sit_info *sit_i = SIT_I(sbi);
1106 int ret;
1107
1108 down_write(&sit_i->sentry_lock);
1109 ret = DIRTY_I(sbi)->v_ops->get_victim(sbi, victim, gc_type,
1110 NO_CHECK_TYPE, LFS);
1111 up_write(&sit_i->sentry_lock);
1112 return ret;
1113 }
1114
1115 static int do_garbage_collect(struct f2fs_sb_info *sbi,
1116 unsigned int start_segno,
1117 struct gc_inode_list *gc_list, int gc_type)
1118 {
1119 struct page *sum_page;
1120 struct f2fs_summary_block *sum;
1121 struct blk_plug plug;
1122 unsigned int segno = start_segno;
1123 unsigned int end_segno = start_segno + sbi->segs_per_sec;
1124 int seg_freed = 0, migrated = 0;
1125 unsigned char type = IS_DATASEG(get_seg_entry(sbi, segno)->type) ?
1126 SUM_TYPE_DATA : SUM_TYPE_NODE;
1127 int submitted = 0;
1128
1129 if (__is_large_section(sbi))
1130 end_segno = rounddown(end_segno, sbi->segs_per_sec);
1131
1132 /* readahead multi ssa blocks those have contiguous address */
1133 if (__is_large_section(sbi))
1134 f2fs_ra_meta_pages(sbi, GET_SUM_BLOCK(sbi, segno),
1135 end_segno - segno, META_SSA, true);
1136
1137 /* reference all summary page */
1138 while (segno < end_segno) {
1139 sum_page = f2fs_get_sum_page(sbi, segno++);
1140 if (IS_ERR(sum_page)) {
1141 int err = PTR_ERR(sum_page);
1142
1143 end_segno = segno - 1;
1144 for (segno = start_segno; segno < end_segno; segno++) {
1145 sum_page = find_get_page(META_MAPPING(sbi),
1146 GET_SUM_BLOCK(sbi, segno));
1147 f2fs_put_page(sum_page, 0);
1148 f2fs_put_page(sum_page, 0);
1149 }
1150 return err;
1151 }
1152 unlock_page(sum_page);
1153 }
1154
1155 blk_start_plug(&plug);
1156
1157 for (segno = start_segno; segno < end_segno; segno++) {
1158
1159 /* find segment summary of victim */
1160 sum_page = find_get_page(META_MAPPING(sbi),
1161 GET_SUM_BLOCK(sbi, segno));
1162 f2fs_put_page(sum_page, 0);
1163
1164 if (get_valid_blocks(sbi, segno, false) == 0)
1165 goto freed;
1166 if (__is_large_section(sbi) &&
1167 migrated >= sbi->migration_granularity)
1168 goto skip;
1169 if (!PageUptodate(sum_page) || unlikely(f2fs_cp_error(sbi)))
1170 goto skip;
1171
1172 sum = page_address(sum_page);
1173 if (type != GET_SUM_TYPE((&sum->footer))) {
1174 f2fs_msg(sbi->sb, KERN_ERR, "Inconsistent segment (%u) "
1175 "type [%d, %d] in SSA and SIT",
1176 segno, type, GET_SUM_TYPE((&sum->footer)));
1177 set_sbi_flag(sbi, SBI_NEED_FSCK);
1178 goto skip;
1179 }
1180
1181 /*
1182 * this is to avoid deadlock:
1183 * - lock_page(sum_page) - f2fs_replace_block
1184 * - check_valid_map() - down_write(sentry_lock)
1185 * - down_read(sentry_lock) - change_curseg()
1186 * - lock_page(sum_page)
1187 */
1188 if (type == SUM_TYPE_NODE)
1189 submitted += gc_node_segment(sbi, sum->entries, segno,
1190 gc_type);
1191 else
1192 submitted += gc_data_segment(sbi, sum->entries, gc_list,
1193 segno, gc_type);
1194
1195 stat_inc_seg_count(sbi, type, gc_type);
1196
1197 freed:
1198 if (gc_type == FG_GC &&
1199 get_valid_blocks(sbi, segno, false) == 0)
1200 seg_freed++;
1201 migrated++;
1202
1203 if (__is_large_section(sbi) && segno + 1 < end_segno)
1204 sbi->next_victim_seg[gc_type] = segno + 1;
1205 skip:
1206 f2fs_put_page(sum_page, 0);
1207 }
1208
1209 if (submitted)
1210 f2fs_submit_merged_write(sbi,
1211 (type == SUM_TYPE_NODE) ? NODE : DATA);
1212
1213 blk_finish_plug(&plug);
1214
1215 stat_inc_call_count(sbi->stat_info);
1216
1217 return seg_freed;
1218 }
1219
1220 int f2fs_gc(struct f2fs_sb_info *sbi, bool sync,
1221 bool background, unsigned int segno)
1222 {
1223 int gc_type = sync ? FG_GC : BG_GC;
1224 int sec_freed = 0, seg_freed = 0, total_freed = 0;
1225 int ret = 0;
1226 struct cp_control cpc;
1227 unsigned int init_segno = segno;
1228 struct gc_inode_list gc_list = {
1229 .ilist = LIST_HEAD_INIT(gc_list.ilist),
1230 .iroot = RADIX_TREE_INIT(gc_list.iroot, GFP_NOFS),
1231 };
1232 unsigned long long last_skipped = sbi->skipped_atomic_files[FG_GC];
1233 unsigned long long first_skipped;
1234 unsigned int skipped_round = 0, round = 0;
1235
1236 trace_f2fs_gc_begin(sbi->sb, sync, background,
1237 get_pages(sbi, F2FS_DIRTY_NODES),
1238 get_pages(sbi, F2FS_DIRTY_DENTS),
1239 get_pages(sbi, F2FS_DIRTY_IMETA),
1240 free_sections(sbi),
1241 free_segments(sbi),
1242 reserved_segments(sbi),
1243 prefree_segments(sbi));
1244
1245 cpc.reason = __get_cp_reason(sbi);
1246 sbi->skipped_gc_rwsem = 0;
1247 first_skipped = last_skipped;
1248 gc_more:
1249 if (unlikely(!(sbi->sb->s_flags & SB_ACTIVE))) {
1250 ret = -EINVAL;
1251 goto stop;
1252 }
1253 if (unlikely(f2fs_cp_error(sbi))) {
1254 ret = -EIO;
1255 goto stop;
1256 }
1257
1258 if (gc_type == BG_GC && has_not_enough_free_secs(sbi, 0, 0)) {
1259 /*
1260 * For example, if there are many prefree_segments below given
1261 * threshold, we can make them free by checkpoint. Then, we
1262 * secure free segments which doesn't need fggc any more.
1263 */
1264 if (prefree_segments(sbi) &&
1265 !is_sbi_flag_set(sbi, SBI_CP_DISABLED)) {
1266 ret = f2fs_write_checkpoint(sbi, &cpc);
1267 if (ret)
1268 goto stop;
1269 }
1270 if (has_not_enough_free_secs(sbi, 0, 0))
1271 gc_type = FG_GC;
1272 }
1273
1274 /* f2fs_balance_fs doesn't need to do BG_GC in critical path. */
1275 if (gc_type == BG_GC && !background) {
1276 ret = -EINVAL;
1277 goto stop;
1278 }
1279 if (!__get_victim(sbi, &segno, gc_type)) {
1280 ret = -ENODATA;
1281 goto stop;
1282 }
1283
1284 seg_freed = do_garbage_collect(sbi, segno, &gc_list, gc_type);
1285 if (gc_type == FG_GC && seg_freed == sbi->segs_per_sec)
1286 sec_freed++;
1287 total_freed += seg_freed;
1288
1289 if (gc_type == FG_GC) {
1290 if (sbi->skipped_atomic_files[FG_GC] > last_skipped ||
1291 sbi->skipped_gc_rwsem)
1292 skipped_round++;
1293 last_skipped = sbi->skipped_atomic_files[FG_GC];
1294 round++;
1295 }
1296
1297 if (gc_type == FG_GC)
1298 sbi->cur_victim_sec = NULL_SEGNO;
1299
1300 if (sync)
1301 goto stop;
1302
1303 if (has_not_enough_free_secs(sbi, sec_freed, 0)) {
1304 if (skipped_round <= MAX_SKIP_GC_COUNT ||
1305 skipped_round * 2 < round) {
1306 segno = NULL_SEGNO;
1307 goto gc_more;
1308 }
1309
1310 if (first_skipped < last_skipped &&
1311 (last_skipped - first_skipped) >
1312 sbi->skipped_gc_rwsem) {
1313 f2fs_drop_inmem_pages_all(sbi, true);
1314 segno = NULL_SEGNO;
1315 goto gc_more;
1316 }
1317 if (gc_type == FG_GC && !is_sbi_flag_set(sbi, SBI_CP_DISABLED))
1318 ret = f2fs_write_checkpoint(sbi, &cpc);
1319 }
1320 stop:
1321 SIT_I(sbi)->last_victim[ALLOC_NEXT] = 0;
1322 SIT_I(sbi)->last_victim[FLUSH_DEVICE] = init_segno;
1323
1324 trace_f2fs_gc_end(sbi->sb, ret, total_freed, sec_freed,
1325 get_pages(sbi, F2FS_DIRTY_NODES),
1326 get_pages(sbi, F2FS_DIRTY_DENTS),
1327 get_pages(sbi, F2FS_DIRTY_IMETA),
1328 free_sections(sbi),
1329 free_segments(sbi),
1330 reserved_segments(sbi),
1331 prefree_segments(sbi));
1332
1333 mutex_unlock(&sbi->gc_mutex);
1334
1335 put_gc_inode(&gc_list);
1336
1337 if (sync && !ret)
1338 ret = sec_freed ? 0 : -EAGAIN;
1339 return ret;
1340 }
1341
1342 void f2fs_build_gc_manager(struct f2fs_sb_info *sbi)
1343 {
1344 DIRTY_I(sbi)->v_ops = &default_v_ops;
1345
1346 sbi->gc_pin_file_threshold = DEF_GC_FAILED_PINNED_FILES;
1347
1348 /* give warm/cold data area from slower device */
1349 if (sbi->s_ndevs && !__is_large_section(sbi))
1350 SIT_I(sbi)->last_victim[ALLOC_NEXT] =
1351 GET_SEGNO(sbi, FDEV(0).end_blk) + 1;
1352 }
Linux with added FPC-III support