Pileus Git - ~andy/linux/blob - fs/f2fs/segment.c

   1 /*
   2  * fs/f2fs/segment.c
   3  *
   4  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   5  *             http://www.samsung.com/
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11 #include <linux/fs.h>
  12 #include <linux/f2fs_fs.h>
  13 #include <linux/bio.h>
  14 #include <linux/blkdev.h>
  15 #include <linux/prefetch.h>
  16 #include <linux/vmalloc.h>
  17 #include <linux/swap.h>
  18
  19 #include "f2fs.h"
  20 #include "segment.h"
  21 #include "node.h"
  22 #include <trace/events/f2fs.h>
  23
  24 #define __reverse_ffz(x) __reverse_ffs(~(x))
  25
  26 static struct kmem_cache *discard_entry_slab;
  27
  28 /*
  29  * __reverse_ffs is copied from include/asm-generic/bitops/__ffs.h since
  30  * MSB and LSB are reversed in a byte by f2fs_set_bit.
  31  */
  32 static inline unsigned long __reverse_ffs(unsigned long word)
  33 {
  34         int num = 0;
  35
  36 #if BITS_PER_LONG == 64
  37         if ((word & 0xffffffff) == 0) {
  38                 num += 32;
  39                 word >>= 32;
  40         }
  41 #endif
  42         if ((word & 0xffff) == 0) {
  43                 num += 16;
  44                 word >>= 16;
  45         }
  46         if ((word & 0xff) == 0) {
  47                 num += 8;
  48                 word >>= 8;
  49         }
  50         if ((word & 0xf0) == 0)
  51                 num += 4;
  52         else
  53                 word >>= 4;
  54         if ((word & 0xc) == 0)
  55                 num += 2;
  56         else
  57                 word >>= 2;
  58         if ((word & 0x2) == 0)
  59                 num += 1;
  60         return num;
  61 }
  62
  63 /*
  64  * __find_rev_next(_zero)_bit is copied from lib/find_next_bit.c becasue
  65  * f2fs_set_bit makes MSB and LSB reversed in a byte.
  66  * Example:
  67  *                             LSB <--> MSB
  68  *   f2fs_set_bit(0, bitmap) => 0000 0001
  69  *   f2fs_set_bit(7, bitmap) => 1000 0000
  70  */
  71 static unsigned long __find_rev_next_bit(const unsigned long *addr,
  72                         unsigned long size, unsigned long offset)
  73 {
  74         const unsigned long *p = addr + BIT_WORD(offset);
  75         unsigned long result = offset & ~(BITS_PER_LONG - 1);
  76         unsigned long tmp;
  77         unsigned long mask, submask;
  78         unsigned long quot, rest;
  79
  80         if (offset >= size)
  81                 return size;
  82
  83         size -= result;
  84         offset %= BITS_PER_LONG;
  85         if (!offset)
  86                 goto aligned;
  87
  88         tmp = *(p++);
  89         quot = (offset >> 3) << 3;
  90         rest = offset & 0x7;
  91         mask = ~0UL << quot;
  92         submask = (unsigned char)(0xff << rest) >> rest;
  93         submask <<= quot;
  94         mask &= submask;
  95         tmp &= mask;
  96         if (size < BITS_PER_LONG)
  97                 goto found_first;
  98         if (tmp)
  99                 goto found_middle;
 100
 101         size -= BITS_PER_LONG;
 102         result += BITS_PER_LONG;
 103 aligned:
 104         while (size & ~(BITS_PER_LONG-1)) {
 105                 tmp = *(p++);
 106                 if (tmp)
 107                         goto found_middle;
 108                 result += BITS_PER_LONG;
 109                 size -= BITS_PER_LONG;
 110         }
 111         if (!size)
 112                 return result;
 113         tmp = *p;
 114 found_first:
 115         tmp &= (~0UL >> (BITS_PER_LONG - size));
 116         if (tmp == 0UL)         /* Are any bits set? */
 117                 return result + size;   /* Nope. */
 118 found_middle:
 119         return result + __reverse_ffs(tmp);
 120 }
 121
 122 static unsigned long __find_rev_next_zero_bit(const unsigned long *addr,
 123                         unsigned long size, unsigned long offset)
 124 {
 125         const unsigned long *p = addr + BIT_WORD(offset);
 126         unsigned long result = offset & ~(BITS_PER_LONG - 1);
 127         unsigned long tmp;
 128         unsigned long mask, submask;
 129         unsigned long quot, rest;
 130
 131         if (offset >= size)
 132                 return size;
 133
 134         size -= result;
 135         offset %= BITS_PER_LONG;
 136         if (!offset)
 137                 goto aligned;
 138
 139         tmp = *(p++);
 140         quot = (offset >> 3) << 3;
 141         rest = offset & 0x7;
 142         mask = ~(~0UL << quot);
 143         submask = (unsigned char)~((unsigned char)(0xff << rest) >> rest);
 144         submask <<= quot;
 145         mask += submask;
 146         tmp |= mask;
 147         if (size < BITS_PER_LONG)
 148                 goto found_first;
 149         if (~tmp)
 150                 goto found_middle;
 151
 152         size -= BITS_PER_LONG;
 153         result += BITS_PER_LONG;
 154 aligned:
 155         while (size & ~(BITS_PER_LONG - 1)) {
 156                 tmp = *(p++);
 157                 if (~tmp)
 158                         goto found_middle;
 159                 result += BITS_PER_LONG;
 160                 size -= BITS_PER_LONG;
 161         }
 162         if (!size)
 163                 return result;
 164         tmp = *p;
 165
 166 found_first:
 167         tmp |= ~0UL << size;
 168         if (tmp == ~0UL)        /* Are any bits zero? */
 169                 return result + size;   /* Nope. */
 170 found_middle:
 171         return result + __reverse_ffz(tmp);
 172 }
 173
 174 /*
 175  * This function balances dirty node and dentry pages.
 176  * In addition, it controls garbage collection.
 177  */
 178 void f2fs_balance_fs(struct f2fs_sb_info *sbi)
 179 {
 180         /*
 181          * We should do GC or end up with checkpoint, if there are so many dirty
 182          * dir/node pages without enough free segments.
 183          */
 184         if (has_not_enough_free_secs(sbi, 0)) {
 185                 mutex_lock(&sbi->gc_mutex);
 186                 f2fs_gc(sbi);
 187         }
 188 }
 189
 190 void f2fs_balance_fs_bg(struct f2fs_sb_info *sbi)
 191 {
 192         /* check the # of cached NAT entries and prefree segments */
 193         if (try_to_free_nats(sbi, NAT_ENTRY_PER_BLOCK) ||
 194                                 excess_prefree_segs(sbi))
 195                 f2fs_sync_fs(sbi->sb, true);
 196 }
 197
 198 static void __locate_dirty_segment(struct f2fs_sb_info *sbi, unsigned int segno,
 199                 enum dirty_type dirty_type)
 200 {
 201         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
 202
 203         /* need not be added */
 204         if (IS_CURSEG(sbi, segno))
 205                 return;
 206
 207         if (!test_and_set_bit(segno, dirty_i->dirty_segmap[dirty_type]))
 208                 dirty_i->nr_dirty[dirty_type]++;
 209
 210         if (dirty_type == DIRTY) {
 211                 struct seg_entry *sentry = get_seg_entry(sbi, segno);
 212                 enum dirty_type t = sentry->type;
 213
 214                 if (!test_and_set_bit(segno, dirty_i->dirty_segmap[t]))
 215                         dirty_i->nr_dirty[t]++;
 216         }
 217 }
 218
 219 static void __remove_dirty_segment(struct f2fs_sb_info *sbi, unsigned int segno,
 220                 enum dirty_type dirty_type)
 221 {
 222         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
 223
 224         if (test_and_clear_bit(segno, dirty_i->dirty_segmap[dirty_type]))
 225                 dirty_i->nr_dirty[dirty_type]--;
 226
 227         if (dirty_type == DIRTY) {
 228                 struct seg_entry *sentry = get_seg_entry(sbi, segno);
 229                 enum dirty_type t = sentry->type;
 230
 231                 if (test_and_clear_bit(segno, dirty_i->dirty_segmap[t]))
 232                         dirty_i->nr_dirty[t]--;
 233
 234                 if (get_valid_blocks(sbi, segno, sbi->segs_per_sec) == 0)
 235                         clear_bit(GET_SECNO(sbi, segno),
 236                                                 dirty_i->victim_secmap);
 237         }
 238 }
 239
 240 /*
 241  * Should not occur error such as -ENOMEM.
 242  * Adding dirty entry into seglist is not critical operation.
 243  * If a given segment is one of current working segments, it won't be added.
 244  */
 245 static void locate_dirty_segment(struct f2fs_sb_info *sbi, unsigned int segno)
 246 {
 247         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
 248         unsigned short valid_blocks;
 249
 250         if (segno == NULL_SEGNO || IS_CURSEG(sbi, segno))
 251                 return;
 252
 253         mutex_lock(&dirty_i->seglist_lock);
 254
 255         valid_blocks = get_valid_blocks(sbi, segno, 0);
 256
 257         if (valid_blocks == 0) {
 258                 __locate_dirty_segment(sbi, segno, PRE);
 259                 __remove_dirty_segment(sbi, segno, DIRTY);
 260         } else if (valid_blocks < sbi->blocks_per_seg) {
 261                 __locate_dirty_segment(sbi, segno, DIRTY);
 262         } else {
 263                 /* Recovery routine with SSR needs this */
 264                 __remove_dirty_segment(sbi, segno, DIRTY);
 265         }
 266
 267         mutex_unlock(&dirty_i->seglist_lock);
 268 }
 269
 270 static void f2fs_issue_discard(struct f2fs_sb_info *sbi,
 271                                 block_t blkstart, block_t blklen)
 272 {
 273         sector_t start = SECTOR_FROM_BLOCK(sbi, blkstart);
 274         sector_t len = SECTOR_FROM_BLOCK(sbi, blklen);
 275         blkdev_issue_discard(sbi->sb->s_bdev, start, len, GFP_NOFS, 0);
 276         trace_f2fs_issue_discard(sbi->sb, blkstart, blklen);
 277 }
 278
 279 static void add_discard_addrs(struct f2fs_sb_info *sbi,
 280                         unsigned int segno, struct seg_entry *se)
 281 {
 282         struct list_head *head = &SM_I(sbi)->discard_list;
 283         struct discard_entry *new;
 284         int entries = SIT_VBLOCK_MAP_SIZE / sizeof(unsigned long);
 285         int max_blocks = sbi->blocks_per_seg;
 286         unsigned long *cur_map = (unsigned long *)se->cur_valid_map;
 287         unsigned long *ckpt_map = (unsigned long *)se->ckpt_valid_map;
 288         unsigned long dmap[entries];
 289         unsigned int start = 0, end = -1;
 290         int i;
 291
 292         if (!test_opt(sbi, DISCARD))
 293                 return;
 294
 295         /* zero block will be discarded through the prefree list */
 296         if (!se->valid_blocks || se->valid_blocks == max_blocks)
 297                 return;
 298
 299         /* SIT_VBLOCK_MAP_SIZE should be multiple of sizeof(unsigned long) */
 300         for (i = 0; i < entries; i++)
 301                 dmap[i] = (cur_map[i] ^ ckpt_map[i]) & ckpt_map[i];
 302
 303         while (SM_I(sbi)->nr_discards <= SM_I(sbi)->max_discards) {
 304                 start = __find_rev_next_bit(dmap, max_blocks, end + 1);
 305                 if (start >= max_blocks)
 306                         break;
 307
 308                 end = __find_rev_next_zero_bit(dmap, max_blocks, start + 1);
 309
 310                 new = f2fs_kmem_cache_alloc(discard_entry_slab, GFP_NOFS);
 311                 INIT_LIST_HEAD(&new->list);
 312                 new->blkaddr = START_BLOCK(sbi, segno) + start;
 313                 new->len = end - start;
 314
 315                 list_add_tail(&new->list, head);
 316                 SM_I(sbi)->nr_discards += end - start;
 317         }
 318 }
 319
 320 /*
 321  * Should call clear_prefree_segments after checkpoint is done.
 322  */
 323 static void set_prefree_as_free_segments(struct f2fs_sb_info *sbi)
 324 {
 325         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
 326         unsigned int segno = -1;
 327         unsigned int total_segs = TOTAL_SEGS(sbi);
 328
 329         mutex_lock(&dirty_i->seglist_lock);
 330         while (1) {
 331                 segno = find_next_bit(dirty_i->dirty_segmap[PRE], total_segs,
 332                                 segno + 1);
 333                 if (segno >= total_segs)
 334                         break;
 335                 __set_test_and_free(sbi, segno);
 336         }
 337         mutex_unlock(&dirty_i->seglist_lock);
 338 }
 339
 340 void clear_prefree_segments(struct f2fs_sb_info *sbi)
 341 {
 342         struct list_head *head = &(SM_I(sbi)->discard_list);
 343         struct list_head *this, *next;
 344         struct discard_entry *entry;
 345         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
 346         unsigned long *prefree_map = dirty_i->dirty_segmap[PRE];
 347         unsigned int total_segs = TOTAL_SEGS(sbi);
 348         unsigned int start = 0, end = -1;
 349
 350         mutex_lock(&dirty_i->seglist_lock);
 351
 352         while (1) {
 353                 int i;
 354                 start = find_next_bit(prefree_map, total_segs, end + 1);
 355                 if (start >= total_segs)
 356                         break;
 357                 end = find_next_zero_bit(prefree_map, total_segs, start + 1);
 358
 359                 for (i = start; i < end; i++)
 360                         clear_bit(i, prefree_map);
 361
 362                 dirty_i->nr_dirty[PRE] -= end - start;
 363
 364                 if (!test_opt(sbi, DISCARD))
 365                         continue;
 366
 367                 f2fs_issue_discard(sbi, START_BLOCK(sbi, start),
 368                                 (end - start) << sbi->log_blocks_per_seg);
 369         }
 370         mutex_unlock(&dirty_i->seglist_lock);
 371
 372         /* send small discards */
 373         list_for_each_safe(this, next, head) {
 374                 entry = list_entry(this, struct discard_entry, list);
 375                 f2fs_issue_discard(sbi, entry->blkaddr, entry->len);
 376                 list_del(&entry->list);
 377                 SM_I(sbi)->nr_discards -= entry->len;
 378                 kmem_cache_free(discard_entry_slab, entry);
 379         }
 380 }
 381
 382 static void __mark_sit_entry_dirty(struct f2fs_sb_info *sbi, unsigned int segno)
 383 {
 384         struct sit_info *sit_i = SIT_I(sbi);
 385         if (!__test_and_set_bit(segno, sit_i->dirty_sentries_bitmap))
 386                 sit_i->dirty_sentries++;
 387 }
 388
 389 static void __set_sit_entry_type(struct f2fs_sb_info *sbi, int type,
 390                                         unsigned int segno, int modified)
 391 {
 392         struct seg_entry *se = get_seg_entry(sbi, segno);
 393         se->type = type;
 394         if (modified)
 395                 __mark_sit_entry_dirty(sbi, segno);
 396 }
 397
 398 static void update_sit_entry(struct f2fs_sb_info *sbi, block_t blkaddr, int del)
 399 {
 400         struct seg_entry *se;
 401         unsigned int segno, offset;
 402         long int new_vblocks;
 403
 404         segno = GET_SEGNO(sbi, blkaddr);
 405
 406         se = get_seg_entry(sbi, segno);
 407         new_vblocks = se->valid_blocks + del;
 408         offset = GET_SEGOFF_FROM_SEG0(sbi, blkaddr) & (sbi->blocks_per_seg - 1);
 409
 410         f2fs_bug_on((new_vblocks >> (sizeof(unsigned short) << 3) ||
 411                                 (new_vblocks > sbi->blocks_per_seg)));
 412
 413         se->valid_blocks = new_vblocks;
 414         se->mtime = get_mtime(sbi);
 415         SIT_I(sbi)->max_mtime = se->mtime;
 416
 417         /* Update valid block bitmap */
 418         if (del > 0) {
 419                 if (f2fs_set_bit(offset, se->cur_valid_map))
 420                         BUG();
 421         } else {
 422                 if (!f2fs_clear_bit(offset, se->cur_valid_map))
 423                         BUG();
 424         }
 425         if (!f2fs_test_bit(offset, se->ckpt_valid_map))
 426                 se->ckpt_valid_blocks += del;
 427
 428         __mark_sit_entry_dirty(sbi, segno);
 429
 430         /* update total number of valid blocks to be written in ckpt area */
 431         SIT_I(sbi)->written_valid_blocks += del;
 432
 433         if (sbi->segs_per_sec > 1)
 434                 get_sec_entry(sbi, segno)->valid_blocks += del;
 435 }
 436
 437 static void refresh_sit_entry(struct f2fs_sb_info *sbi,
 438                         block_t old_blkaddr, block_t new_blkaddr)
 439 {
 440         update_sit_entry(sbi, new_blkaddr, 1);
 441         if (GET_SEGNO(sbi, old_blkaddr) != NULL_SEGNO)
 442                 update_sit_entry(sbi, old_blkaddr, -1);
 443 }
 444
 445 void invalidate_blocks(struct f2fs_sb_info *sbi, block_t addr)
 446 {
 447         unsigned int segno = GET_SEGNO(sbi, addr);
 448         struct sit_info *sit_i = SIT_I(sbi);
 449
 450         f2fs_bug_on(addr == NULL_ADDR);
 451         if (addr == NEW_ADDR)
 452                 return;
 453
 454         /* add it into sit main buffer */
 455         mutex_lock(&sit_i->sentry_lock);
 456
 457         update_sit_entry(sbi, addr, -1);
 458
 459         /* add it into dirty seglist */
 460         locate_dirty_segment(sbi, segno);
 461
 462         mutex_unlock(&sit_i->sentry_lock);
 463 }
 464
 465 /*
 466  * This function should be resided under the curseg_mutex lock
 467  */
 468 static void __add_sum_entry(struct f2fs_sb_info *sbi, int type,
 469                                         struct f2fs_summary *sum)
 470 {
 471         struct curseg_info *curseg = CURSEG_I(sbi, type);
 472         void *addr = curseg->sum_blk;
 473         addr += curseg->next_blkoff * sizeof(struct f2fs_summary);
 474         memcpy(addr, sum, sizeof(struct f2fs_summary));
 475 }
 476
 477 /*
 478  * Calculate the number of current summary pages for writing
 479  */
 480 int npages_for_summary_flush(struct f2fs_sb_info *sbi)
 481 {
 482         int valid_sum_count = 0;
 483         int i, sum_in_page;
 484
 485         for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++) {
 486                 if (sbi->ckpt->alloc_type[i] == SSR)
 487                         valid_sum_count += sbi->blocks_per_seg;
 488                 else
 489                         valid_sum_count += curseg_blkoff(sbi, i);
 490         }
 491
 492         sum_in_page = (PAGE_CACHE_SIZE - 2 * SUM_JOURNAL_SIZE -
 493                         SUM_FOOTER_SIZE) / SUMMARY_SIZE;
 494         if (valid_sum_count <= sum_in_page)
 495                 return 1;
 496         else if ((valid_sum_count - sum_in_page) <=
 497                 (PAGE_CACHE_SIZE - SUM_FOOTER_SIZE) / SUMMARY_SIZE)
 498                 return 2;
 499         return 3;
 500 }
 501
 502 /*
 503  * Caller should put this summary page
 504  */
 505 struct page *get_sum_page(struct f2fs_sb_info *sbi, unsigned int segno)
 506 {
 507         return get_meta_page(sbi, GET_SUM_BLOCK(sbi, segno));
 508 }
 509
 510 static void write_sum_page(struct f2fs_sb_info *sbi,
 511                         struct f2fs_summary_block *sum_blk, block_t blk_addr)
 512 {
 513         struct page *page = grab_meta_page(sbi, blk_addr);
 514         void *kaddr = page_address(page);
 515         memcpy(kaddr, sum_blk, PAGE_CACHE_SIZE);
 516         set_page_dirty(page);
 517         f2fs_put_page(page, 1);
 518 }
 519
 520 static int is_next_segment_free(struct f2fs_sb_info *sbi, int type)
 521 {
 522         struct curseg_info *curseg = CURSEG_I(sbi, type);
 523         unsigned int segno = curseg->segno + 1;
 524         struct free_segmap_info *free_i = FREE_I(sbi);
 525
 526         if (segno < TOTAL_SEGS(sbi) && segno % sbi->segs_per_sec)
 527                 return !test_bit(segno, free_i->free_segmap);
 528         return 0;
 529 }
 530
 531 /*
 532  * Find a new segment from the free segments bitmap to right order
 533  * This function should be returned with success, otherwise BUG
 534  */
 535 static void get_new_segment(struct f2fs_sb_info *sbi,
 536                         unsigned int *newseg, bool new_sec, int dir)
 537 {
 538         struct free_segmap_info *free_i = FREE_I(sbi);
 539         unsigned int segno, secno, zoneno;
 540         unsigned int total_zones = TOTAL_SECS(sbi) / sbi->secs_per_zone;
 541         unsigned int hint = *newseg / sbi->segs_per_sec;
 542         unsigned int old_zoneno = GET_ZONENO_FROM_SEGNO(sbi, *newseg);
 543         unsigned int left_start = hint;
 544         bool init = true;
 545         int go_left = 0;
 546         int i;
 547
 548         write_lock(&free_i->segmap_lock);
 549
 550         if (!new_sec && ((*newseg + 1) % sbi->segs_per_sec)) {
 551                 segno = find_next_zero_bit(free_i->free_segmap,
 552                                         TOTAL_SEGS(sbi), *newseg + 1);
 553                 if (segno - *newseg < sbi->segs_per_sec -
 554                                         (*newseg % sbi->segs_per_sec))
 555                         goto got_it;
 556         }
 557 find_other_zone:
 558         secno = find_next_zero_bit(free_i->free_secmap, TOTAL_SECS(sbi), hint);
 559         if (secno >= TOTAL_SECS(sbi)) {
 560                 if (dir == ALLOC_RIGHT) {
 561                         secno = find_next_zero_bit(free_i->free_secmap,
 562                                                         TOTAL_SECS(sbi), 0);
 563                         f2fs_bug_on(secno >= TOTAL_SECS(sbi));
 564                 } else {
 565                         go_left = 1;
 566                         left_start = hint - 1;
 567                 }
 568         }
 569         if (go_left == 0)
 570                 goto skip_left;
 571
 572         while (test_bit(left_start, free_i->free_secmap)) {
 573                 if (left_start > 0) {
 574                         left_start--;
 575                         continue;
 576                 }
 577                 left_start = find_next_zero_bit(free_i->free_secmap,
 578                                                         TOTAL_SECS(sbi), 0);
 579                 f2fs_bug_on(left_start >= TOTAL_SECS(sbi));
 580                 break;
 581         }
 582         secno = left_start;
 583 skip_left:
 584         hint = secno;
 585         segno = secno * sbi->segs_per_sec;
 586         zoneno = secno / sbi->secs_per_zone;
 587
 588         /* give up on finding another zone */
 589         if (!init)
 590                 goto got_it;
 591         if (sbi->secs_per_zone == 1)
 592                 goto got_it;
 593         if (zoneno == old_zoneno)
 594                 goto got_it;
 595         if (dir == ALLOC_LEFT) {
 596                 if (!go_left && zoneno + 1 >= total_zones)
 597                         goto got_it;
 598                 if (go_left && zoneno == 0)
 599                         goto got_it;
 600         }
 601         for (i = 0; i < NR_CURSEG_TYPE; i++)
 602                 if (CURSEG_I(sbi, i)->zone == zoneno)
 603                         break;
 604
 605         if (i < NR_CURSEG_TYPE) {
 606                 /* zone is in user, try another */
 607                 if (go_left)
 608                         hint = zoneno * sbi->secs_per_zone - 1;
 609                 else if (zoneno + 1 >= total_zones)
 610                         hint = 0;
 611                 else
 612                         hint = (zoneno + 1) * sbi->secs_per_zone;
 613                 init = false;
 614                 goto find_other_zone;
 615         }
 616 got_it:
 617         /* set it as dirty segment in free segmap */
 618         f2fs_bug_on(test_bit(segno, free_i->free_segmap));
 619         __set_inuse(sbi, segno);
 620         *newseg = segno;
 621         write_unlock(&free_i->segmap_lock);
 622 }
 623
 624 static void reset_curseg(struct f2fs_sb_info *sbi, int type, int modified)
 625 {
 626         struct curseg_info *curseg = CURSEG_I(sbi, type);
 627         struct summary_footer *sum_footer;
 628
 629         curseg->segno = curseg->next_segno;
 630         curseg->zone = GET_ZONENO_FROM_SEGNO(sbi, curseg->segno);
 631         curseg->next_blkoff = 0;
 632         curseg->next_segno = NULL_SEGNO;
 633
 634         sum_footer = &(curseg->sum_blk->footer);
 635         memset(sum_footer, 0, sizeof(struct summary_footer));
 636         if (IS_DATASEG(type))
 637                 SET_SUM_TYPE(sum_footer, SUM_TYPE_DATA);
 638         if (IS_NODESEG(type))
 639                 SET_SUM_TYPE(sum_footer, SUM_TYPE_NODE);
 640         __set_sit_entry_type(sbi, type, curseg->segno, modified);
 641 }
 642
 643 /*
 644  * Allocate a current working segment.
 645  * This function always allocates a free segment in LFS manner.
 646  */
 647 static void new_curseg(struct f2fs_sb_info *sbi, int type, bool new_sec)
 648 {
 649         struct curseg_info *curseg = CURSEG_I(sbi, type);
 650         unsigned int segno = curseg->segno;
 651         int dir = ALLOC_LEFT;
 652
 653         write_sum_page(sbi, curseg->sum_blk,
 654                                 GET_SUM_BLOCK(sbi, segno));
 655         if (type == CURSEG_WARM_DATA || type == CURSEG_COLD_DATA)
 656                 dir = ALLOC_RIGHT;
 657
 658         if (test_opt(sbi, NOHEAP))
 659                 dir = ALLOC_RIGHT;
 660
 661         get_new_segment(sbi, &segno, new_sec, dir);
 662         curseg->next_segno = segno;
 663         reset_curseg(sbi, type, 1);
 664         curseg->alloc_type = LFS;
 665 }
 666
 667 static void __next_free_blkoff(struct f2fs_sb_info *sbi,
 668                         struct curseg_info *seg, block_t start)
 669 {
 670         struct seg_entry *se = get_seg_entry(sbi, seg->segno);
 671         int entries = SIT_VBLOCK_MAP_SIZE / sizeof(unsigned long);
 672         unsigned long target_map[entries];
 673         unsigned long *ckpt_map = (unsigned long *)se->ckpt_valid_map;
 674         unsigned long *cur_map = (unsigned long *)se->cur_valid_map;
 675         int i, pos;
 676
 677         for (i = 0; i < entries; i++)
 678                 target_map[i] = ckpt_map[i] | cur_map[i];
 679
 680         pos = __find_rev_next_zero_bit(target_map, sbi->blocks_per_seg, start);
 681
 682         seg->next_blkoff = pos;
 683 }
 684
 685 /*
 686  * If a segment is written by LFS manner, next block offset is just obtained
 687  * by increasing the current block offset. However, if a segment is written by
 688  * SSR manner, next block offset obtained by calling __next_free_blkoff
 689  */
 690 static void __refresh_next_blkoff(struct f2fs_sb_info *sbi,
 691                                 struct curseg_info *seg)
 692 {
 693         if (seg->alloc_type == SSR)
 694                 __next_free_blkoff(sbi, seg, seg->next_blkoff + 1);
 695         else
 696                 seg->next_blkoff++;
 697 }
 698
 699 /*
 700  * This function always allocates a used segment (from dirty seglist) by SSR
 701  * manner, so it should recover the existing segment information of valid blocks
 702  */
 703 static void change_curseg(struct f2fs_sb_info *sbi, int type, bool reuse)
 704 {
 705         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
 706         struct curseg_info *curseg = CURSEG_I(sbi, type);
 707         unsigned int new_segno = curseg->next_segno;
 708         struct f2fs_summary_block *sum_node;
 709         struct page *sum_page;
 710
 711         write_sum_page(sbi, curseg->sum_blk,
 712                                 GET_SUM_BLOCK(sbi, curseg->segno));
 713         __set_test_and_inuse(sbi, new_segno);
 714
 715         mutex_lock(&dirty_i->seglist_lock);
 716         __remove_dirty_segment(sbi, new_segno, PRE);
 717         __remove_dirty_segment(sbi, new_segno, DIRTY);
 718         mutex_unlock(&dirty_i->seglist_lock);
 719
 720         reset_curseg(sbi, type, 1);
 721         curseg->alloc_type = SSR;
 722         __next_free_blkoff(sbi, curseg, 0);
 723
 724         if (reuse) {
 725                 sum_page = get_sum_page(sbi, new_segno);
 726                 sum_node = (struct f2fs_summary_block *)page_address(sum_page);
 727                 memcpy(curseg->sum_blk, sum_node, SUM_ENTRY_SIZE);
 728                 f2fs_put_page(sum_page, 1);
 729         }
 730 }
 731
 732 static int get_ssr_segment(struct f2fs_sb_info *sbi, int type)
 733 {
 734         struct curseg_info *curseg = CURSEG_I(sbi, type);
 735         const struct victim_selection *v_ops = DIRTY_I(sbi)->v_ops;
 736
 737         if (IS_NODESEG(type) || !has_not_enough_free_secs(sbi, 0))
 738                 return v_ops->get_victim(sbi,
 739                                 &(curseg)->next_segno, BG_GC, type, SSR);
 740
 741         /* For data segments, let's do SSR more intensively */
 742         for (; type >= CURSEG_HOT_DATA; type--)
 743                 if (v_ops->get_victim(sbi, &(curseg)->next_segno,
 744                                                 BG_GC, type, SSR))
 745                         return 1;
 746         return 0;
 747 }
 748
 749 /*
 750  * flush out current segment and replace it with new segment
 751  * This function should be returned with success, otherwise BUG
 752  */
 753 static void allocate_segment_by_default(struct f2fs_sb_info *sbi,
 754                                                 int type, bool force)
 755 {
 756         struct curseg_info *curseg = CURSEG_I(sbi, type);
 757
 758         if (force)
 759                 new_curseg(sbi, type, true);
 760         else if (type == CURSEG_WARM_NODE)
 761                 new_curseg(sbi, type, false);
 762         else if (curseg->alloc_type == LFS && is_next_segment_free(sbi, type))
 763                 new_curseg(sbi, type, false);
 764         else if (need_SSR(sbi) && get_ssr_segment(sbi, type))
 765                 change_curseg(sbi, type, true);
 766         else
 767                 new_curseg(sbi, type, false);
 768
 769         stat_inc_seg_type(sbi, curseg);
 770 }
 771
 772 void allocate_new_segments(struct f2fs_sb_info *sbi)
 773 {
 774         struct curseg_info *curseg;
 775         unsigned int old_curseg;
 776         int i;
 777
 778         for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++) {
 779                 curseg = CURSEG_I(sbi, i);
 780                 old_curseg = curseg->segno;
 781                 SIT_I(sbi)->s_ops->allocate_segment(sbi, i, true);
 782                 locate_dirty_segment(sbi, old_curseg);
 783         }
 784 }
 785
 786 static const struct segment_allocation default_salloc_ops = {
 787         .allocate_segment = allocate_segment_by_default,
 788 };
 789
 790 static bool __has_curseg_space(struct f2fs_sb_info *sbi, int type)
 791 {
 792         struct curseg_info *curseg = CURSEG_I(sbi, type);
 793         if (curseg->next_blkoff < sbi->blocks_per_seg)
 794                 return true;
 795         return false;
 796 }
 797
 798 static int __get_segment_type_2(struct page *page, enum page_type p_type)
 799 {
 800         if (p_type == DATA)
 801                 return CURSEG_HOT_DATA;
 802         else
 803                 return CURSEG_HOT_NODE;
 804 }
 805
 806 static int __get_segment_type_4(struct page *page, enum page_type p_type)
 807 {
 808         if (p_type == DATA) {
 809                 struct inode *inode = page->mapping->host;
 810
 811                 if (S_ISDIR(inode->i_mode))
 812                         return CURSEG_HOT_DATA;
 813                 else
 814                         return CURSEG_COLD_DATA;
 815         } else {
 816                 if (IS_DNODE(page) && !is_cold_node(page))
 817                         return CURSEG_HOT_NODE;
 818                 else
 819                         return CURSEG_COLD_NODE;
 820         }
 821 }
 822
 823 static int __get_segment_type_6(struct page *page, enum page_type p_type)
 824 {
 825         if (p_type == DATA) {
 826                 struct inode *inode = page->mapping->host;
 827
 828                 if (S_ISDIR(inode->i_mode))
 829                         return CURSEG_HOT_DATA;
 830                 else if (is_cold_data(page) || file_is_cold(inode))
 831                         return CURSEG_COLD_DATA;
 832                 else
 833                         return CURSEG_WARM_DATA;
 834         } else {
 835                 if (IS_DNODE(page))
 836                         return is_cold_node(page) ? CURSEG_WARM_NODE :
 837                                                 CURSEG_HOT_NODE;
 838                 else
 839                         return CURSEG_COLD_NODE;
 840         }
 841 }
 842
 843 static int __get_segment_type(struct page *page, enum page_type p_type)
 844 {
 845         struct f2fs_sb_info *sbi = F2FS_SB(page->mapping->host->i_sb);
 846         switch (sbi->active_logs) {
 847         case 2:
 848                 return __get_segment_type_2(page, p_type);
 849         case 4:
 850                 return __get_segment_type_4(page, p_type);
 851         }
 852         /* NR_CURSEG_TYPE(6) logs by default */
 853         f2fs_bug_on(sbi->active_logs != NR_CURSEG_TYPE);
 854         return __get_segment_type_6(page, p_type);
 855 }
 856
 857 void allocate_data_block(struct f2fs_sb_info *sbi, struct page *page,
 858                 block_t old_blkaddr, block_t *new_blkaddr,
 859                 struct f2fs_summary *sum, int type)
 860 {
 861         struct sit_info *sit_i = SIT_I(sbi);
 862         struct curseg_info *curseg;
 863         unsigned int old_cursegno;
 864
 865         curseg = CURSEG_I(sbi, type);
 866
 867         mutex_lock(&curseg->curseg_mutex);
 868
 869         *new_blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
 870         old_cursegno = curseg->segno;
 871
 872         /*
 873          * __add_sum_entry should be resided under the curseg_mutex
 874          * because, this function updates a summary entry in the
 875          * current summary block.
 876          */
 877         __add_sum_entry(sbi, type, sum);
 878
 879         mutex_lock(&sit_i->sentry_lock);
 880         __refresh_next_blkoff(sbi, curseg);
 881
 882         stat_inc_block_count(sbi, curseg);
 883
 884         /*
 885          * SIT information should be updated before segment allocation,
 886          * since SSR needs latest valid block information.
 887          */
 888         refresh_sit_entry(sbi, old_blkaddr, *new_blkaddr);
 889
 890         if (!__has_curseg_space(sbi, type))
 891                 sit_i->s_ops->allocate_segment(sbi, type, false);
 892
 893         locate_dirty_segment(sbi, old_cursegno);
 894         locate_dirty_segment(sbi, GET_SEGNO(sbi, old_blkaddr));
 895         mutex_unlock(&sit_i->sentry_lock);
 896
 897         if (page && IS_NODESEG(type))
 898                 fill_node_footer_blkaddr(page, NEXT_FREE_BLKADDR(sbi, curseg));
 899
 900         mutex_unlock(&curseg->curseg_mutex);
 901 }
 902
 903 static void do_write_page(struct f2fs_sb_info *sbi, struct page *page,
 904                         block_t old_blkaddr, block_t *new_blkaddr,
 905                         struct f2fs_summary *sum, struct f2fs_io_info *fio)
 906 {
 907         int type = __get_segment_type(page, fio->type);
 908
 909         allocate_data_block(sbi, page, old_blkaddr, new_blkaddr, sum, type);
 910
 911         /* writeout dirty page into bdev */
 912         f2fs_submit_page_mbio(sbi, page, *new_blkaddr, fio);
 913 }
 914
 915 void write_meta_page(struct f2fs_sb_info *sbi, struct page *page)
 916 {
 917         struct f2fs_io_info fio = {
 918                 .type = META,
 919                 .rw = WRITE_SYNC | REQ_META | REQ_PRIO
 920         };
 921
 922         set_page_writeback(page);
 923         f2fs_submit_page_mbio(sbi, page, page->index, &fio);
 924 }
 925
 926 void write_node_page(struct f2fs_sb_info *sbi, struct page *page,
 927                 struct f2fs_io_info *fio,
 928                 unsigned int nid, block_t old_blkaddr, block_t *new_blkaddr)
 929 {
 930         struct f2fs_summary sum;
 931         set_summary(&sum, nid, 0, 0);
 932         do_write_page(sbi, page, old_blkaddr, new_blkaddr, &sum, fio);
 933 }
 934
 935 void write_data_page(struct page *page, struct dnode_of_data *dn,
 936                 block_t *new_blkaddr, struct f2fs_io_info *fio)
 937 {
 938         struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb);
 939         struct f2fs_summary sum;
 940         struct node_info ni;
 941
 942         f2fs_bug_on(dn->data_blkaddr == NULL_ADDR);
 943         get_node_info(sbi, dn->nid, &ni);
 944         set_summary(&sum, dn->nid, dn->ofs_in_node, ni.version);
 945
 946         do_write_page(sbi, page, dn->data_blkaddr, new_blkaddr, &sum, fio);
 947 }
 948
 949 void rewrite_data_page(struct page *page, block_t old_blkaddr,
 950                                         struct f2fs_io_info *fio)
 951 {
 952         struct inode *inode = page->mapping->host;
 953         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 954         f2fs_submit_page_mbio(sbi, page, old_blkaddr, fio);
 955 }
 956
 957 void recover_data_page(struct f2fs_sb_info *sbi,
 958                         struct page *page, struct f2fs_summary *sum,
 959                         block_t old_blkaddr, block_t new_blkaddr)
 960 {
 961         struct sit_info *sit_i = SIT_I(sbi);
 962         struct curseg_info *curseg;
 963         unsigned int segno, old_cursegno;
 964         struct seg_entry *se;
 965         int type;
 966
 967         segno = GET_SEGNO(sbi, new_blkaddr);
 968         se = get_seg_entry(sbi, segno);
 969         type = se->type;
 970
 971         if (se->valid_blocks == 0 && !IS_CURSEG(sbi, segno)) {
 972                 if (old_blkaddr == NULL_ADDR)
 973                         type = CURSEG_COLD_DATA;
 974                 else
 975                         type = CURSEG_WARM_DATA;
 976         }
 977         curseg = CURSEG_I(sbi, type);
 978
 979         mutex_lock(&curseg->curseg_mutex);
 980         mutex_lock(&sit_i->sentry_lock);
 981
 982         old_cursegno = curseg->segno;
 983
 984         /* change the current segment */
 985         if (segno != curseg->segno) {
 986                 curseg->next_segno = segno;
 987                 change_curseg(sbi, type, true);
 988         }
 989
 990         curseg->next_blkoff = GET_SEGOFF_FROM_SEG0(sbi, new_blkaddr) &
 991                                         (sbi->blocks_per_seg - 1);
 992         __add_sum_entry(sbi, type, sum);
 993
 994         refresh_sit_entry(sbi, old_blkaddr, new_blkaddr);
 995
 996         locate_dirty_segment(sbi, old_cursegno);
 997         locate_dirty_segment(sbi, GET_SEGNO(sbi, old_blkaddr));
 998
 999         mutex_unlock(&sit_i->sentry_lock);
1000         mutex_unlock(&curseg->curseg_mutex);
1001 }
1002
1003 void rewrite_node_page(struct f2fs_sb_info *sbi,
1004                         struct page *page, struct f2fs_summary *sum,
1005                         block_t old_blkaddr, block_t new_blkaddr)
1006 {
1007         struct sit_info *sit_i = SIT_I(sbi);
1008         int type = CURSEG_WARM_NODE;
1009         struct curseg_info *curseg;
1010         unsigned int segno, old_cursegno;
1011         block_t next_blkaddr = next_blkaddr_of_node(page);
1012         unsigned int next_segno = GET_SEGNO(sbi, next_blkaddr);
1013         struct f2fs_io_info fio = {
1014                 .type = NODE,
1015                 .rw = WRITE_SYNC,
1016         };
1017
1018         curseg = CURSEG_I(sbi, type);
1019
1020         mutex_lock(&curseg->curseg_mutex);
1021         mutex_lock(&sit_i->sentry_lock);
1022
1023         segno = GET_SEGNO(sbi, new_blkaddr);
1024         old_cursegno = curseg->segno;
1025
1026         /* change the current segment */
1027         if (segno != curseg->segno) {
1028                 curseg->next_segno = segno;
1029                 change_curseg(sbi, type, true);
1030         }
1031         curseg->next_blkoff = GET_SEGOFF_FROM_SEG0(sbi, new_blkaddr) &
1032                                         (sbi->blocks_per_seg - 1);
1033         __add_sum_entry(sbi, type, sum);
1034
1035         /* change the current log to the next block addr in advance */
1036         if (next_segno != segno) {
1037                 curseg->next_segno = next_segno;
1038                 change_curseg(sbi, type, true);
1039         }
1040         curseg->next_blkoff = GET_SEGOFF_FROM_SEG0(sbi, next_blkaddr) &
1041                                         (sbi->blocks_per_seg - 1);
1042
1043         /* rewrite node page */
1044         set_page_writeback(page);
1045         f2fs_submit_page_mbio(sbi, page, new_blkaddr, &fio);
1046         f2fs_submit_merged_bio(sbi, NODE, WRITE);
1047         refresh_sit_entry(sbi, old_blkaddr, new_blkaddr);
1048
1049         locate_dirty_segment(sbi, old_cursegno);
1050         locate_dirty_segment(sbi, GET_SEGNO(sbi, old_blkaddr));
1051
1052         mutex_unlock(&sit_i->sentry_lock);
1053         mutex_unlock(&curseg->curseg_mutex);
1054 }
1055
1056 void f2fs_wait_on_page_writeback(struct page *page,
1057                                 enum page_type type)
1058 {
1059         struct f2fs_sb_info *sbi = F2FS_SB(page->mapping->host->i_sb);
1060         if (PageWriteback(page)) {
1061                 f2fs_submit_merged_bio(sbi, type, WRITE);
1062                 wait_on_page_writeback(page);
1063         }
1064 }
1065
1066 static int read_compacted_summaries(struct f2fs_sb_info *sbi)
1067 {
1068         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1069         struct curseg_info *seg_i;
1070         unsigned char *kaddr;
1071         struct page *page;
1072         block_t start;
1073         int i, j, offset;
1074
1075         start = start_sum_block(sbi);
1076
1077         page = get_meta_page(sbi, start++);
1078         kaddr = (unsigned char *)page_address(page);
1079
1080         /* Step 1: restore nat cache */
1081         seg_i = CURSEG_I(sbi, CURSEG_HOT_DATA);
1082         memcpy(&seg_i->sum_blk->n_nats, kaddr, SUM_JOURNAL_SIZE);
1083
1084         /* Step 2: restore sit cache */
1085         seg_i = CURSEG_I(sbi, CURSEG_COLD_DATA);
1086         memcpy(&seg_i->sum_blk->n_sits, kaddr + SUM_JOURNAL_SIZE,
1087                                                 SUM_JOURNAL_SIZE);
1088         offset = 2 * SUM_JOURNAL_SIZE;
1089
1090         /* Step 3: restore summary entries */
1091         for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++) {
1092                 unsigned short blk_off;
1093                 unsigned int segno;
1094
1095                 seg_i = CURSEG_I(sbi, i);
1096                 segno = le32_to_cpu(ckpt->cur_data_segno[i]);
1097                 blk_off = le16_to_cpu(ckpt->cur_data_blkoff[i]);
1098                 seg_i->next_segno = segno;
1099                 reset_curseg(sbi, i, 0);
1100                 seg_i->alloc_type = ckpt->alloc_type[i];
1101                 seg_i->next_blkoff = blk_off;
1102
1103                 if (seg_i->alloc_type == SSR)
1104                         blk_off = sbi->blocks_per_seg;
1105
1106                 for (j = 0; j < blk_off; j++) {
1107                         struct f2fs_summary *s;
1108                         s = (struct f2fs_summary *)(kaddr + offset);
1109                         seg_i->sum_blk->entries[j] = *s;
1110                         offset += SUMMARY_SIZE;
1111                         if (offset + SUMMARY_SIZE <= PAGE_CACHE_SIZE -
1112                                                 SUM_FOOTER_SIZE)
1113                                 continue;
1114
1115                         f2fs_put_page(page, 1);
1116                         page = NULL;
1117
1118                         page = get_meta_page(sbi, start++);
1119                         kaddr = (unsigned char *)page_address(page);
1120                         offset = 0;
1121                 }
1122         }
1123         f2fs_put_page(page, 1);
1124         return 0;
1125 }
1126
1127 static int read_normal_summaries(struct f2fs_sb_info *sbi, int type)
1128 {
1129         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1130         struct f2fs_summary_block *sum;
1131         struct curseg_info *curseg;
1132         struct page *new;
1133         unsigned short blk_off;
1134         unsigned int segno = 0;
1135         block_t blk_addr = 0;
1136
1137         /* get segment number and block addr */
1138         if (IS_DATASEG(type)) {
1139                 segno = le32_to_cpu(ckpt->cur_data_segno[type]);
1140                 blk_off = le16_to_cpu(ckpt->cur_data_blkoff[type -
1141                                                         CURSEG_HOT_DATA]);
1142                 if (is_set_ckpt_flags(ckpt, CP_UMOUNT_FLAG))
1143                         blk_addr = sum_blk_addr(sbi, NR_CURSEG_TYPE, type);
1144                 else
1145                         blk_addr = sum_blk_addr(sbi, NR_CURSEG_DATA_TYPE, type);
1146         } else {
1147                 segno = le32_to_cpu(ckpt->cur_node_segno[type -
1148                                                         CURSEG_HOT_NODE]);
1149                 blk_off = le16_to_cpu(ckpt->cur_node_blkoff[type -
1150                                                         CURSEG_HOT_NODE]);
1151                 if (is_set_ckpt_flags(ckpt, CP_UMOUNT_FLAG))
1152                         blk_addr = sum_blk_addr(sbi, NR_CURSEG_NODE_TYPE,
1153                                                         type - CURSEG_HOT_NODE);
1154                 else
1155                         blk_addr = GET_SUM_BLOCK(sbi, segno);
1156         }
1157
1158         new = get_meta_page(sbi, blk_addr);
1159         sum = (struct f2fs_summary_block *)page_address(new);
1160
1161         if (IS_NODESEG(type)) {
1162                 if (is_set_ckpt_flags(ckpt, CP_UMOUNT_FLAG)) {
1163                         struct f2fs_summary *ns = &sum->entries[0];
1164                         int i;
1165                         for (i = 0; i < sbi->blocks_per_seg; i++, ns++) {
1166                                 ns->version = 0;
1167                                 ns->ofs_in_node = 0;
1168                         }
1169                 } else {
1170                         if (restore_node_summary(sbi, segno, sum)) {
1171                                 f2fs_put_page(new, 1);
1172                                 return -EINVAL;
1173                         }
1174                 }
1175         }
1176
1177         /* set uncompleted segment to curseg */
1178         curseg = CURSEG_I(sbi, type);
1179         mutex_lock(&curseg->curseg_mutex);
1180         memcpy(curseg->sum_blk, sum, PAGE_CACHE_SIZE);
1181         curseg->next_segno = segno;
1182         reset_curseg(sbi, type, 0);
1183         curseg->alloc_type = ckpt->alloc_type[type];
1184         curseg->next_blkoff = blk_off;
1185         mutex_unlock(&curseg->curseg_mutex);
1186         f2fs_put_page(new, 1);
1187         return 0;
1188 }
1189
1190 static int restore_curseg_summaries(struct f2fs_sb_info *sbi)
1191 {
1192         int type = CURSEG_HOT_DATA;
1193
1194         if (is_set_ckpt_flags(F2FS_CKPT(sbi), CP_COMPACT_SUM_FLAG)) {
1195                 /* restore for compacted data summary */
1196                 if (read_compacted_summaries(sbi))
1197                         return -EINVAL;
1198                 type = CURSEG_HOT_NODE;
1199         }
1200
1201         for (; type <= CURSEG_COLD_NODE; type++)
1202                 if (read_normal_summaries(sbi, type))
1203                         return -EINVAL;
1204         return 0;
1205 }
1206
1207 static void write_compacted_summaries(struct f2fs_sb_info *sbi, block_t blkaddr)
1208 {
1209         struct page *page;
1210         unsigned char *kaddr;
1211         struct f2fs_summary *summary;
1212         struct curseg_info *seg_i;
1213         int written_size = 0;
1214         int i, j;
1215
1216         page = grab_meta_page(sbi, blkaddr++);
1217         kaddr = (unsigned char *)page_address(page);
1218
1219         /* Step 1: write nat cache */
1220         seg_i = CURSEG_I(sbi, CURSEG_HOT_DATA);
1221         memcpy(kaddr, &seg_i->sum_blk->n_nats, SUM_JOURNAL_SIZE);
1222         written_size += SUM_JOURNAL_SIZE;
1223
1224         /* Step 2: write sit cache */
1225         seg_i = CURSEG_I(sbi, CURSEG_COLD_DATA);
1226         memcpy(kaddr + written_size, &seg_i->sum_blk->n_sits,
1227                                                 SUM_JOURNAL_SIZE);
1228         written_size += SUM_JOURNAL_SIZE;
1229
1230         /* Step 3: write summary entries */
1231         for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++) {
1232                 unsigned short blkoff;
1233                 seg_i = CURSEG_I(sbi, i);
1234                 if (sbi->ckpt->alloc_type[i] == SSR)
1235                         blkoff = sbi->blocks_per_seg;
1236                 else
1237                         blkoff = curseg_blkoff(sbi, i);
1238
1239                 for (j = 0; j < blkoff; j++) {
1240                         if (!page) {
1241                                 page = grab_meta_page(sbi, blkaddr++);
1242                                 kaddr = (unsigned char *)page_address(page);
1243                                 written_size = 0;
1244                         }
1245                         summary = (struct f2fs_summary *)(kaddr + written_size);
1246                         *summary = seg_i->sum_blk->entries[j];
1247                         written_size += SUMMARY_SIZE;
1248
1249                         if (written_size + SUMMARY_SIZE <= PAGE_CACHE_SIZE -
1250                                                         SUM_FOOTER_SIZE)
1251                                 continue;
1252
1253                         set_page_dirty(page);
1254                         f2fs_put_page(page, 1);
1255                         page = NULL;
1256                 }
1257         }
1258         if (page) {
1259                 set_page_dirty(page);
1260                 f2fs_put_page(page, 1);
1261         }
1262 }
1263
1264 static void write_normal_summaries(struct f2fs_sb_info *sbi,
1265                                         block_t blkaddr, int type)
1266 {
1267         int i, end;
1268         if (IS_DATASEG(type))
1269                 end = type + NR_CURSEG_DATA_TYPE;
1270         else
1271                 end = type + NR_CURSEG_NODE_TYPE;
1272
1273         for (i = type; i < end; i++) {
1274                 struct curseg_info *sum = CURSEG_I(sbi, i);
1275                 mutex_lock(&sum->curseg_mutex);
1276                 write_sum_page(sbi, sum->sum_blk, blkaddr + (i - type));
1277                 mutex_unlock(&sum->curseg_mutex);
1278         }
1279 }
1280
1281 void write_data_summaries(struct f2fs_sb_info *sbi, block_t start_blk)
1282 {
1283         if (is_set_ckpt_flags(F2FS_CKPT(sbi), CP_COMPACT_SUM_FLAG))
1284                 write_compacted_summaries(sbi, start_blk);
1285         else
1286                 write_normal_summaries(sbi, start_blk, CURSEG_HOT_DATA);
1287 }
1288
1289 void write_node_summaries(struct f2fs_sb_info *sbi, block_t start_blk)
1290 {
1291         if (is_set_ckpt_flags(F2FS_CKPT(sbi), CP_UMOUNT_FLAG))
1292                 write_normal_summaries(sbi, start_blk, CURSEG_HOT_NODE);
1293 }
1294
1295 int lookup_journal_in_cursum(struct f2fs_summary_block *sum, int type,
1296                                         unsigned int val, int alloc)
1297 {
1298         int i;
1299
1300         if (type == NAT_JOURNAL) {
1301                 for (i = 0; i < nats_in_cursum(sum); i++) {
1302                         if (le32_to_cpu(nid_in_journal(sum, i)) == val)
1303                                 return i;
1304                 }
1305                 if (alloc && nats_in_cursum(sum) < NAT_JOURNAL_ENTRIES)
1306                         return update_nats_in_cursum(sum, 1);
1307         } else if (type == SIT_JOURNAL) {
1308                 for (i = 0; i < sits_in_cursum(sum); i++)
1309                         if (le32_to_cpu(segno_in_journal(sum, i)) == val)
1310                                 return i;
1311                 if (alloc && sits_in_cursum(sum) < SIT_JOURNAL_ENTRIES)
1312                         return update_sits_in_cursum(sum, 1);
1313         }
1314         return -1;
1315 }
1316
1317 static struct page *get_current_sit_page(struct f2fs_sb_info *sbi,
1318                                         unsigned int segno)
1319 {
1320         struct sit_info *sit_i = SIT_I(sbi);
1321         unsigned int offset = SIT_BLOCK_OFFSET(sit_i, segno);
1322         block_t blk_addr = sit_i->sit_base_addr + offset;
1323
1324         check_seg_range(sbi, segno);
1325
1326         /* calculate sit block address */
1327         if (f2fs_test_bit(offset, sit_i->sit_bitmap))
1328                 blk_addr += sit_i->sit_blocks;
1329
1330         return get_meta_page(sbi, blk_addr);
1331 }
1332
1333 static struct page *get_next_sit_page(struct f2fs_sb_info *sbi,
1334                                         unsigned int start)
1335 {
1336         struct sit_info *sit_i = SIT_I(sbi);
1337         struct page *src_page, *dst_page;
1338         pgoff_t src_off, dst_off;
1339         void *src_addr, *dst_addr;
1340
1341         src_off = current_sit_addr(sbi, start);
1342         dst_off = next_sit_addr(sbi, src_off);
1343
1344         /* get current sit block page without lock */
1345         src_page = get_meta_page(sbi, src_off);
1346         dst_page = grab_meta_page(sbi, dst_off);
1347         f2fs_bug_on(PageDirty(src_page));
1348
1349         src_addr = page_address(src_page);
1350         dst_addr = page_address(dst_page);
1351         memcpy(dst_addr, src_addr, PAGE_CACHE_SIZE);
1352
1353         set_page_dirty(dst_page);
1354         f2fs_put_page(src_page, 1);
1355
1356         set_to_next_sit(sit_i, start);
1357
1358         return dst_page;
1359 }
1360
1361 static bool flush_sits_in_journal(struct f2fs_sb_info *sbi)
1362 {
1363         struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_COLD_DATA);
1364         struct f2fs_summary_block *sum = curseg->sum_blk;
1365         int i;
1366
1367         /*
1368          * If the journal area in the current summary is full of sit entries,
1369          * all the sit entries will be flushed. Otherwise the sit entries
1370          * are not able to replace with newly hot sit entries.
1371          */
1372         if (sits_in_cursum(sum) >= SIT_JOURNAL_ENTRIES) {
1373                 for (i = sits_in_cursum(sum) - 1; i >= 0; i--) {
1374                         unsigned int segno;
1375                         segno = le32_to_cpu(segno_in_journal(sum, i));
1376                         __mark_sit_entry_dirty(sbi, segno);
1377                 }
1378                 update_sits_in_cursum(sum, -sits_in_cursum(sum));
1379                 return true;
1380         }
1381         return false;
1382 }
1383
1384 /*
1385  * CP calls this function, which flushes SIT entries including sit_journal,
1386  * and moves prefree segs to free segs.
1387  */
1388 void flush_sit_entries(struct f2fs_sb_info *sbi)
1389 {
1390         struct sit_info *sit_i = SIT_I(sbi);
1391         unsigned long *bitmap = sit_i->dirty_sentries_bitmap;
1392         struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_COLD_DATA);
1393         struct f2fs_summary_block *sum = curseg->sum_blk;
1394         unsigned long nsegs = TOTAL_SEGS(sbi);
1395         struct page *page = NULL;
1396         struct f2fs_sit_block *raw_sit = NULL;
1397         unsigned int start = 0, end = 0;
1398         unsigned int segno = -1;
1399         bool flushed;
1400
1401         mutex_lock(&curseg->curseg_mutex);
1402         mutex_lock(&sit_i->sentry_lock);
1403
1404         /*
1405          * "flushed" indicates whether sit entries in journal are flushed
1406          * to the SIT area or not.
1407          */
1408         flushed = flush_sits_in_journal(sbi);
1409
1410         while ((segno = find_next_bit(bitmap, nsegs, segno + 1)) < nsegs) {
1411                 struct seg_entry *se = get_seg_entry(sbi, segno);
1412                 int sit_offset, offset;
1413
1414                 sit_offset = SIT_ENTRY_OFFSET(sit_i, segno);
1415
1416                 /* add discard candidates */
1417                 if (SM_I(sbi)->nr_discards < SM_I(sbi)->max_discards)
1418                         add_discard_addrs(sbi, segno, se);
1419
1420                 if (flushed)
1421                         goto to_sit_page;
1422
1423                 offset = lookup_journal_in_cursum(sum, SIT_JOURNAL, segno, 1);
1424                 if (offset >= 0) {
1425                         segno_in_journal(sum, offset) = cpu_to_le32(segno);
1426                         seg_info_to_raw_sit(se, &sit_in_journal(sum, offset));
1427                         goto flush_done;
1428                 }
1429 to_sit_page:
1430                 if (!page || (start > segno) || (segno > end)) {
1431                         if (page) {
1432                                 f2fs_put_page(page, 1);
1433                                 page = NULL;
1434                         }
1435
1436                         start = START_SEGNO(sit_i, segno);
1437                         end = start + SIT_ENTRY_PER_BLOCK - 1;
1438
1439                         /* read sit block that will be updated */
1440                         page = get_next_sit_page(sbi, start);
1441                         raw_sit = page_address(page);
1442                 }
1443
1444                 /* udpate entry in SIT block */
1445                 seg_info_to_raw_sit(se, &raw_sit->entries[sit_offset]);
1446 flush_done:
1447                 __clear_bit(segno, bitmap);
1448                 sit_i->dirty_sentries--;
1449         }
1450         mutex_unlock(&sit_i->sentry_lock);
1451         mutex_unlock(&curseg->curseg_mutex);
1452
1453         /* writeout last modified SIT block */
1454         f2fs_put_page(page, 1);
1455
1456         set_prefree_as_free_segments(sbi);
1457 }
1458
1459 static int build_sit_info(struct f2fs_sb_info *sbi)
1460 {
1461         struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
1462         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1463         struct sit_info *sit_i;
1464         unsigned int sit_segs, start;
1465         char *src_bitmap, *dst_bitmap;
1466         unsigned int bitmap_size;
1467
1468         /* allocate memory for SIT information */
1469         sit_i = kzalloc(sizeof(struct sit_info), GFP_KERNEL);
1470         if (!sit_i)
1471                 return -ENOMEM;
1472
1473         SM_I(sbi)->sit_info = sit_i;
1474
1475         sit_i->sentries = vzalloc(TOTAL_SEGS(sbi) * sizeof(struct seg_entry));
1476         if (!sit_i->sentries)
1477                 return -ENOMEM;
1478
1479         bitmap_size = f2fs_bitmap_size(TOTAL_SEGS(sbi));
1480         sit_i->dirty_sentries_bitmap = kzalloc(bitmap_size, GFP_KERNEL);
1481         if (!sit_i->dirty_sentries_bitmap)
1482                 return -ENOMEM;
1483
1484         for (start = 0; start < TOTAL_SEGS(sbi); start++) {
1485                 sit_i->sentries[start].cur_valid_map
1486                         = kzalloc(SIT_VBLOCK_MAP_SIZE, GFP_KERNEL);
1487                 sit_i->sentries[start].ckpt_valid_map
1488                         = kzalloc(SIT_VBLOCK_MAP_SIZE, GFP_KERNEL);
1489                 if (!sit_i->sentries[start].cur_valid_map
1490                                 || !sit_i->sentries[start].ckpt_valid_map)
1491                         return -ENOMEM;
1492         }
1493
1494         if (sbi->segs_per_sec > 1) {
1495                 sit_i->sec_entries = vzalloc(TOTAL_SECS(sbi) *
1496                                         sizeof(struct sec_entry));
1497                 if (!sit_i->sec_entries)
1498                         return -ENOMEM;
1499         }
1500
1501         /* get information related with SIT */
1502         sit_segs = le32_to_cpu(raw_super->segment_count_sit) >> 1;
1503
1504         /* setup SIT bitmap from ckeckpoint pack */
1505         bitmap_size = __bitmap_size(sbi, SIT_BITMAP);
1506         src_bitmap = __bitmap_ptr(sbi, SIT_BITMAP);
1507
1508         dst_bitmap = kmemdup(src_bitmap, bitmap_size, GFP_KERNEL);
1509         if (!dst_bitmap)
1510                 return -ENOMEM;
1511
1512         /* init SIT information */
1513         sit_i->s_ops = &default_salloc_ops;
1514
1515         sit_i->sit_base_addr = le32_to_cpu(raw_super->sit_blkaddr);
1516         sit_i->sit_blocks = sit_segs << sbi->log_blocks_per_seg;
1517         sit_i->written_valid_blocks = le64_to_cpu(ckpt->valid_block_count);
1518         sit_i->sit_bitmap = dst_bitmap;
1519         sit_i->bitmap_size = bitmap_size;
1520         sit_i->dirty_sentries = 0;
1521         sit_i->sents_per_block = SIT_ENTRY_PER_BLOCK;
1522         sit_i->elapsed_time = le64_to_cpu(sbi->ckpt->elapsed_time);
1523         sit_i->mounted_time = CURRENT_TIME_SEC.tv_sec;
1524         mutex_init(&sit_i->sentry_lock);
1525         return 0;
1526 }
1527
1528 static int build_free_segmap(struct f2fs_sb_info *sbi)
1529 {
1530         struct f2fs_sm_info *sm_info = SM_I(sbi);
1531         struct free_segmap_info *free_i;
1532         unsigned int bitmap_size, sec_bitmap_size;
1533
1534         /* allocate memory for free segmap information */
1535         free_i = kzalloc(sizeof(struct free_segmap_info), GFP_KERNEL);
1536         if (!free_i)
1537                 return -ENOMEM;
1538
1539         SM_I(sbi)->free_info = free_i;
1540
1541         bitmap_size = f2fs_bitmap_size(TOTAL_SEGS(sbi));
1542         free_i->free_segmap = kmalloc(bitmap_size, GFP_KERNEL);
1543         if (!free_i->free_segmap)
1544                 return -ENOMEM;
1545
1546         sec_bitmap_size = f2fs_bitmap_size(TOTAL_SECS(sbi));
1547         free_i->free_secmap = kmalloc(sec_bitmap_size, GFP_KERNEL);
1548         if (!free_i->free_secmap)
1549                 return -ENOMEM;
1550
1551         /* set all segments as dirty temporarily */
1552         memset(free_i->free_segmap, 0xff, bitmap_size);
1553         memset(free_i->free_secmap, 0xff, sec_bitmap_size);
1554
1555         /* init free segmap information */
1556         free_i->start_segno =
1557                 (unsigned int) GET_SEGNO_FROM_SEG0(sbi, sm_info->main_blkaddr);
1558         free_i->free_segments = 0;
1559         free_i->free_sections = 0;
1560         rwlock_init(&free_i->segmap_lock);
1561         return 0;
1562 }
1563
1564 static int build_curseg(struct f2fs_sb_info *sbi)
1565 {
1566         struct curseg_info *array;
1567         int i;
1568
1569         array = kzalloc(sizeof(*array) * NR_CURSEG_TYPE, GFP_KERNEL);
1570         if (!array)
1571                 return -ENOMEM;
1572
1573         SM_I(sbi)->curseg_array = array;
1574
1575         for (i = 0; i < NR_CURSEG_TYPE; i++) {
1576                 mutex_init(&array[i].curseg_mutex);
1577                 array[i].sum_blk = kzalloc(PAGE_CACHE_SIZE, GFP_KERNEL);
1578                 if (!array[i].sum_blk)
1579                         return -ENOMEM;
1580                 array[i].segno = NULL_SEGNO;
1581                 array[i].next_blkoff = 0;
1582         }
1583         return restore_curseg_summaries(sbi);
1584 }
1585
1586 static int ra_sit_pages(struct f2fs_sb_info *sbi, int start, int nrpages)
1587 {
1588         struct address_space *mapping = META_MAPPING(sbi);
1589         struct page *page;
1590         block_t blk_addr, prev_blk_addr = 0;
1591         int sit_blk_cnt = SIT_BLK_CNT(sbi);
1592         int blkno = start;
1593         struct f2fs_io_info fio = {
1594                 .type = META,
1595                 .rw = READ_SYNC | REQ_META | REQ_PRIO
1596         };
1597
1598         for (; blkno < start + nrpages && blkno < sit_blk_cnt; blkno++) {
1599
1600                 blk_addr = current_sit_addr(sbi, blkno * SIT_ENTRY_PER_BLOCK);
1601
1602                 if (blkno != start && prev_blk_addr + 1 != blk_addr)
1603                         break;
1604                 prev_blk_addr = blk_addr;
1605 repeat:
1606                 page = grab_cache_page(mapping, blk_addr);
1607                 if (!page) {
1608                         cond_resched();
1609                         goto repeat;
1610                 }
1611                 if (PageUptodate(page)) {
1612                         mark_page_accessed(page);
1613                         f2fs_put_page(page, 1);
1614                         continue;
1615                 }
1616
1617                 f2fs_submit_page_mbio(sbi, page, blk_addr, &fio);
1618
1619                 mark_page_accessed(page);
1620                 f2fs_put_page(page, 0);
1621         }
1622
1623         f2fs_submit_merged_bio(sbi, META, READ);
1624         return blkno - start;
1625 }
1626
1627 static void build_sit_entries(struct f2fs_sb_info *sbi)
1628 {
1629         struct sit_info *sit_i = SIT_I(sbi);
1630         struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_COLD_DATA);
1631         struct f2fs_summary_block *sum = curseg->sum_blk;
1632         int sit_blk_cnt = SIT_BLK_CNT(sbi);
1633         unsigned int i, start, end;
1634         unsigned int readed, start_blk = 0;
1635         int nrpages = MAX_BIO_BLOCKS(max_hw_blocks(sbi));
1636
1637         do {
1638                 readed = ra_sit_pages(sbi, start_blk, nrpages);
1639
1640                 start = start_blk * sit_i->sents_per_block;
1641                 end = (start_blk + readed) * sit_i->sents_per_block;
1642
1643                 for (; start < end && start < TOTAL_SEGS(sbi); start++) {
1644                         struct seg_entry *se = &sit_i->sentries[start];
1645                         struct f2fs_sit_block *sit_blk;
1646                         struct f2fs_sit_entry sit;
1647                         struct page *page;
1648
1649                         mutex_lock(&curseg->curseg_mutex);
1650                         for (i = 0; i < sits_in_cursum(sum); i++) {
1651                                 if (le32_to_cpu(segno_in_journal(sum, i))
1652                                                                 == start) {
1653                                         sit = sit_in_journal(sum, i);
1654                                         mutex_unlock(&curseg->curseg_mutex);
1655                                         goto got_it;
1656                                 }
1657                         }
1658                         mutex_unlock(&curseg->curseg_mutex);
1659
1660                         page = get_current_sit_page(sbi, start);
1661                         sit_blk = (struct f2fs_sit_block *)page_address(page);
1662                         sit = sit_blk->entries[SIT_ENTRY_OFFSET(sit_i, start)];
1663                         f2fs_put_page(page, 1);
1664 got_it:
1665                         check_block_count(sbi, start, &sit);
1666                         seg_info_from_raw_sit(se, &sit);
1667                         if (sbi->segs_per_sec > 1) {
1668                                 struct sec_entry *e = get_sec_entry(sbi, start);
1669                                 e->valid_blocks += se->valid_blocks;
1670                         }
1671                 }
1672                 start_blk += readed;
1673         } while (start_blk < sit_blk_cnt);
1674 }
1675
1676 static void init_free_segmap(struct f2fs_sb_info *sbi)
1677 {
1678         unsigned int start;
1679         int type;
1680
1681         for (start = 0; start < TOTAL_SEGS(sbi); start++) {
1682                 struct seg_entry *sentry = get_seg_entry(sbi, start);
1683                 if (!sentry->valid_blocks)
1684                         __set_free(sbi, start);
1685         }
1686
1687         /* set use the current segments */
1688         for (type = CURSEG_HOT_DATA; type <= CURSEG_COLD_NODE; type++) {
1689                 struct curseg_info *curseg_t = CURSEG_I(sbi, type);
1690                 __set_test_and_inuse(sbi, curseg_t->segno);
1691         }
1692 }
1693
1694 static void init_dirty_segmap(struct f2fs_sb_info *sbi)
1695 {
1696         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
1697         struct free_segmap_info *free_i = FREE_I(sbi);
1698         unsigned int segno = 0, offset = 0, total_segs = TOTAL_SEGS(sbi);
1699         unsigned short valid_blocks;
1700
1701         while (1) {
1702                 /* find dirty segment based on free segmap */
1703                 segno = find_next_inuse(free_i, total_segs, offset);
1704                 if (segno >= total_segs)
1705                         break;
1706                 offset = segno + 1;
1707                 valid_blocks = get_valid_blocks(sbi, segno, 0);
1708                 if (valid_blocks >= sbi->blocks_per_seg || !valid_blocks)
1709                         continue;
1710                 mutex_lock(&dirty_i->seglist_lock);
1711                 __locate_dirty_segment(sbi, segno, DIRTY);
1712                 mutex_unlock(&dirty_i->seglist_lock);
1713         }
1714 }
1715
1716 static int init_victim_secmap(struct f2fs_sb_info *sbi)
1717 {
1718         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
1719         unsigned int bitmap_size = f2fs_bitmap_size(TOTAL_SECS(sbi));
1720
1721         dirty_i->victim_secmap = kzalloc(bitmap_size, GFP_KERNEL);
1722         if (!dirty_i->victim_secmap)
1723                 return -ENOMEM;
1724         return 0;
1725 }
1726
1727 static int build_dirty_segmap(struct f2fs_sb_info *sbi)
1728 {
1729         struct dirty_seglist_info *dirty_i;
1730         unsigned int bitmap_size, i;
1731
1732         /* allocate memory for dirty segments list information */
1733         dirty_i = kzalloc(sizeof(struct dirty_seglist_info), GFP_KERNEL);
1734         if (!dirty_i)
1735                 return -ENOMEM;
1736
1737         SM_I(sbi)->dirty_info = dirty_i;
1738         mutex_init(&dirty_i->seglist_lock);
1739
1740         bitmap_size = f2fs_bitmap_size(TOTAL_SEGS(sbi));
1741
1742         for (i = 0; i < NR_DIRTY_TYPE; i++) {
1743                 dirty_i->dirty_segmap[i] = kzalloc(bitmap_size, GFP_KERNEL);
1744                 if (!dirty_i->dirty_segmap[i])
1745                         return -ENOMEM;
1746         }
1747
1748         init_dirty_segmap(sbi);
1749         return init_victim_secmap(sbi);
1750 }
1751
1752 /*
1753  * Update min, max modified time for cost-benefit GC algorithm
1754  */
1755 static void init_min_max_mtime(struct f2fs_sb_info *sbi)
1756 {
1757         struct sit_info *sit_i = SIT_I(sbi);
1758         unsigned int segno;
1759
1760         mutex_lock(&sit_i->sentry_lock);
1761
1762         sit_i->min_mtime = LLONG_MAX;
1763
1764         for (segno = 0; segno < TOTAL_SEGS(sbi); segno += sbi->segs_per_sec) {
1765                 unsigned int i;
1766                 unsigned long long mtime = 0;
1767
1768                 for (i = 0; i < sbi->segs_per_sec; i++)
1769                         mtime += get_seg_entry(sbi, segno + i)->mtime;
1770
1771                 mtime = div_u64(mtime, sbi->segs_per_sec);
1772
1773                 if (sit_i->min_mtime > mtime)
1774                         sit_i->min_mtime = mtime;
1775         }
1776         sit_i->max_mtime = get_mtime(sbi);
1777         mutex_unlock(&sit_i->sentry_lock);
1778 }
1779
1780 int build_segment_manager(struct f2fs_sb_info *sbi)
1781 {
1782         struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
1783         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1784         struct f2fs_sm_info *sm_info;
1785         int err;
1786
1787         sm_info = kzalloc(sizeof(struct f2fs_sm_info), GFP_KERNEL);
1788         if (!sm_info)
1789                 return -ENOMEM;
1790
1791         /* init sm info */
1792         sbi->sm_info = sm_info;
1793         INIT_LIST_HEAD(&sm_info->wblist_head);
1794         spin_lock_init(&sm_info->wblist_lock);
1795         sm_info->seg0_blkaddr = le32_to_cpu(raw_super->segment0_blkaddr);
1796         sm_info->main_blkaddr = le32_to_cpu(raw_super->main_blkaddr);
1797         sm_info->segment_count = le32_to_cpu(raw_super->segment_count);
1798         sm_info->reserved_segments = le32_to_cpu(ckpt->rsvd_segment_count);
1799         sm_info->ovp_segments = le32_to_cpu(ckpt->overprov_segment_count);
1800         sm_info->main_segments = le32_to_cpu(raw_super->segment_count_main);
1801         sm_info->ssa_blkaddr = le32_to_cpu(raw_super->ssa_blkaddr);
1802         sm_info->rec_prefree_segments = DEF_RECLAIM_PREFREE_SEGMENTS;
1803         sm_info->ipu_policy = F2FS_IPU_DISABLE;
1804         sm_info->min_ipu_util = DEF_MIN_IPU_UTIL;
1805
1806         INIT_LIST_HEAD(&sm_info->discard_list);
1807         sm_info->nr_discards = 0;
1808         sm_info->max_discards = 0;
1809
1810         err = build_sit_info(sbi);
1811         if (err)
1812                 return err;
1813         err = build_free_segmap(sbi);
1814         if (err)
1815                 return err;
1816         err = build_curseg(sbi);
1817         if (err)
1818                 return err;
1819
1820         /* reinit free segmap based on SIT */
1821         build_sit_entries(sbi);
1822
1823         init_free_segmap(sbi);
1824         err = build_dirty_segmap(sbi);
1825         if (err)
1826                 return err;
1827
1828         init_min_max_mtime(sbi);
1829         return 0;
1830 }
1831
1832 static void discard_dirty_segmap(struct f2fs_sb_info *sbi,
1833                 enum dirty_type dirty_type)
1834 {
1835         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
1836
1837         mutex_lock(&dirty_i->seglist_lock);
1838         kfree(dirty_i->dirty_segmap[dirty_type]);
1839         dirty_i->nr_dirty[dirty_type] = 0;
1840         mutex_unlock(&dirty_i->seglist_lock);
1841 }
1842
1843 static void destroy_victim_secmap(struct f2fs_sb_info *sbi)
1844 {
1845         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
1846         kfree(dirty_i->victim_secmap);
1847 }
1848
1849 static void destroy_dirty_segmap(struct f2fs_sb_info *sbi)
1850 {
1851         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
1852         int i;
1853
1854         if (!dirty_i)
1855                 return;
1856
1857         /* discard pre-free/dirty segments list */
1858         for (i = 0; i < NR_DIRTY_TYPE; i++)
1859                 discard_dirty_segmap(sbi, i);
1860
1861         destroy_victim_secmap(sbi);
1862         SM_I(sbi)->dirty_info = NULL;
1863         kfree(dirty_i);
1864 }
1865
1866 static void destroy_curseg(struct f2fs_sb_info *sbi)
1867 {
1868         struct curseg_info *array = SM_I(sbi)->curseg_array;
1869         int i;
1870
1871         if (!array)
1872                 return;
1873         SM_I(sbi)->curseg_array = NULL;
1874         for (i = 0; i < NR_CURSEG_TYPE; i++)
1875                 kfree(array[i].sum_blk);
1876         kfree(array);
1877 }
1878
1879 static void destroy_free_segmap(struct f2fs_sb_info *sbi)
1880 {
1881         struct free_segmap_info *free_i = SM_I(sbi)->free_info;
1882         if (!free_i)
1883                 return;
1884         SM_I(sbi)->free_info = NULL;
1885         kfree(free_i->free_segmap);
1886         kfree(free_i->free_secmap);
1887         kfree(free_i);
1888 }
1889
1890 static void destroy_sit_info(struct f2fs_sb_info *sbi)
1891 {
1892         struct sit_info *sit_i = SIT_I(sbi);
1893         unsigned int start;
1894
1895         if (!sit_i)
1896                 return;
1897
1898         if (sit_i->sentries) {
1899                 for (start = 0; start < TOTAL_SEGS(sbi); start++) {
1900                         kfree(sit_i->sentries[start].cur_valid_map);
1901                         kfree(sit_i->sentries[start].ckpt_valid_map);
1902                 }
1903         }
1904         vfree(sit_i->sentries);
1905         vfree(sit_i->sec_entries);
1906         kfree(sit_i->dirty_sentries_bitmap);
1907
1908         SM_I(sbi)->sit_info = NULL;
1909         kfree(sit_i->sit_bitmap);
1910         kfree(sit_i);
1911 }
1912
1913 void destroy_segment_manager(struct f2fs_sb_info *sbi)
1914 {
1915         struct f2fs_sm_info *sm_info = SM_I(sbi);
1916         if (!sm_info)
1917                 return;
1918         destroy_dirty_segmap(sbi);
1919         destroy_curseg(sbi);
1920         destroy_free_segmap(sbi);
1921         destroy_sit_info(sbi);
1922         sbi->sm_info = NULL;
1923         kfree(sm_info);
1924 }
1925
1926 int __init create_segment_manager_caches(void)
1927 {
1928         discard_entry_slab = f2fs_kmem_cache_create("discard_entry",
1929                         sizeof(struct discard_entry), NULL);
1930         if (!discard_entry_slab)
1931                 return -ENOMEM;
1932         return 0;
1933 }
1934
1935 void destroy_segment_manager_caches(void)
1936 {
1937         kmem_cache_destroy(discard_entry_slab);
1938 }