fs/f2fs/gc.c

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