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/kthread.h>
  17 #include <linux/swap.h>
  18 #include <linux/timer.h>
  19
  20 #include "f2fs.h"
  21 #include "segment.h"
  22 #include "node.h"
  23 #include "trace.h"
  24 #include <trace/events/f2fs.h>
  25
  26 #define __reverse_ffz(x) __reverse_ffs(~(x))
  27
  28 static struct kmem_cache *discard_entry_slab;
  29 static struct kmem_cache *bio_entry_slab;
  30 static struct kmem_cache *sit_entry_set_slab;
  31 static struct kmem_cache *inmem_entry_slab;
  32
  33 static unsigned long __reverse_ulong(unsigned char *str)
  34 {
  35         unsigned long tmp = 0;
  36         int shift = 24, idx = 0;
  37
  38 #if BITS_PER_LONG == 64
  39         shift = 56;
  40 #endif
  41         while (shift >= 0) {
  42                 tmp |= (unsigned long)str[idx++] << shift;
  43                 shift -= BITS_PER_BYTE;
  44         }
  45         return tmp;
  46 }
  47
  48 /*
  49  * __reverse_ffs is copied from include/asm-generic/bitops/__ffs.h since
  50  * MSB and LSB are reversed in a byte by f2fs_set_bit.
  51  */
  52 static inline unsigned long __reverse_ffs(unsigned long word)
  53 {
  54         int num = 0;
  55
  56 #if BITS_PER_LONG == 64
  57         if ((word & 0xffffffff00000000UL) == 0)
  58                 num += 32;
  59         else
  60                 word >>= 32;
  61 #endif
  62         if ((word & 0xffff0000) == 0)
  63                 num += 16;
  64         else
  65                 word >>= 16;
  66
  67         if ((word & 0xff00) == 0)
  68                 num += 8;
  69         else
  70                 word >>= 8;
  71
  72         if ((word & 0xf0) == 0)
  73                 num += 4;
  74         else
  75                 word >>= 4;
  76
  77         if ((word & 0xc) == 0)
  78                 num += 2;
  79         else
  80                 word >>= 2;
  81
  82         if ((word & 0x2) == 0)
  83                 num += 1;
  84         return num;
  85 }
  86
  87 /*
  88  * __find_rev_next(_zero)_bit is copied from lib/find_next_bit.c because
  89  * f2fs_set_bit makes MSB and LSB reversed in a byte.
  90  * @size must be integral times of unsigned long.
  91  * Example:
  92  *                             MSB <--> LSB
  93  *   f2fs_set_bit(0, bitmap) => 1000 0000
  94  *   f2fs_set_bit(7, bitmap) => 0000 0001
  95  */
  96 static unsigned long __find_rev_next_bit(const unsigned long *addr,
  97                         unsigned long size, unsigned long offset)
  98 {
  99         const unsigned long *p = addr + BIT_WORD(offset);
 100         unsigned long result = size;
 101         unsigned long tmp;
 102
 103         if (offset >= size)
 104                 return size;
 105
 106         size -= (offset & ~(BITS_PER_LONG - 1));
 107         offset %= BITS_PER_LONG;
 108
 109         while (1) {
 110                 if (*p == 0)
 111                         goto pass;
 112
 113                 tmp = __reverse_ulong((unsigned char *)p);
 114
 115                 tmp &= ~0UL >> offset;
 116                 if (size < BITS_PER_LONG)
 117                         tmp &= (~0UL << (BITS_PER_LONG - size));
 118                 if (tmp)
 119                         goto found;
 120 pass:
 121                 if (size <= BITS_PER_LONG)
 122                         break;
 123                 size -= BITS_PER_LONG;
 124                 offset = 0;
 125                 p++;
 126         }
 127         return result;
 128 found:
 129         return result - size + __reverse_ffs(tmp);
 130 }
 131
 132 static unsigned long __find_rev_next_zero_bit(const unsigned long *addr,
 133                         unsigned long size, unsigned long offset)
 134 {
 135         const unsigned long *p = addr + BIT_WORD(offset);
 136         unsigned long result = size;
 137         unsigned long tmp;
 138
 139         if (offset >= size)
 140                 return size;
 141
 142         size -= (offset & ~(BITS_PER_LONG - 1));
 143         offset %= BITS_PER_LONG;
 144
 145         while (1) {
 146                 if (*p == ~0UL)
 147                         goto pass;
 148
 149                 tmp = __reverse_ulong((unsigned char *)p);
 150
 151                 if (offset)
 152                         tmp |= ~0UL << (BITS_PER_LONG - offset);
 153                 if (size < BITS_PER_LONG)
 154                         tmp |= ~0UL >> size;
 155                 if (tmp != ~0UL)
 156                         goto found;
 157 pass:
 158                 if (size <= BITS_PER_LONG)
 159                         break;
 160                 size -= BITS_PER_LONG;
 161                 offset = 0;
 162                 p++;
 163         }
 164         return result;
 165 found:
 166         return result - size + __reverse_ffz(tmp);
 167 }
 168
 169 void register_inmem_page(struct inode *inode, struct page *page)
 170 {
 171         struct f2fs_inode_info *fi = F2FS_I(inode);
 172         struct inmem_pages *new;
 173
 174         f2fs_trace_pid(page);
 175
 176         set_page_private(page, (unsigned long)ATOMIC_WRITTEN_PAGE);
 177         SetPagePrivate(page);
 178
 179         new = f2fs_kmem_cache_alloc(inmem_entry_slab, GFP_NOFS);
 180
 181         /* add atomic page indices to the list */
 182         new->page = page;
 183         INIT_LIST_HEAD(&new->list);
 184
 185         /* increase reference count with clean state */
 186         mutex_lock(&fi->inmem_lock);
 187         get_page(page);
 188         list_add_tail(&new->list, &fi->inmem_pages);
 189         inc_page_count(F2FS_I_SB(inode), F2FS_INMEM_PAGES);
 190         mutex_unlock(&fi->inmem_lock);
 191
 192         trace_f2fs_register_inmem_page(page, INMEM);
 193 }
 194
 195 static int __revoke_inmem_pages(struct inode *inode,
 196                                 struct list_head *head, bool drop, bool recover)
 197 {
 198         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 199         struct inmem_pages *cur, *tmp;
 200         int err = 0;
 201
 202         list_for_each_entry_safe(cur, tmp, head, list) {
 203                 struct page *page = cur->page;
 204
 205                 if (drop)
 206                         trace_f2fs_commit_inmem_page(page, INMEM_DROP);
 207
 208                 lock_page(page);
 209
 210                 if (recover) {
 211                         struct dnode_of_data dn;
 212                         struct node_info ni;
 213
 214                         trace_f2fs_commit_inmem_page(page, INMEM_REVOKE);
 215
 216                         set_new_dnode(&dn, inode, NULL, NULL, 0);
 217                         if (get_dnode_of_data(&dn, page->index, LOOKUP_NODE)) {
 218                                 err = -EAGAIN;
 219                                 goto next;
 220                         }
 221                         get_node_info(sbi, dn.nid, &ni);
 222                         f2fs_replace_block(sbi, &dn, dn.data_blkaddr,
 223                                         cur->old_addr, ni.version, true, true);
 224                         f2fs_put_dnode(&dn);
 225                 }
 226 next:
 227                 /* we don't need to invalidate this in the sccessful status */
 228                 if (drop || recover)
 229                         ClearPageUptodate(page);
 230                 set_page_private(page, 0);
 231                 ClearPagePrivate(page);
 232                 f2fs_put_page(page, 1);
 233
 234                 list_del(&cur->list);
 235                 kmem_cache_free(inmem_entry_slab, cur);
 236                 dec_page_count(F2FS_I_SB(inode), F2FS_INMEM_PAGES);
 237         }
 238         return err;
 239 }
 240
 241 void drop_inmem_pages(struct inode *inode)
 242 {
 243         struct f2fs_inode_info *fi = F2FS_I(inode);
 244
 245         clear_inode_flag(inode, FI_ATOMIC_FILE);
 246
 247         mutex_lock(&fi->inmem_lock);
 248         __revoke_inmem_pages(inode, &fi->inmem_pages, true, false);
 249         mutex_unlock(&fi->inmem_lock);
 250 }
 251
 252 static int __commit_inmem_pages(struct inode *inode,
 253                                         struct list_head *revoke_list)
 254 {
 255         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 256         struct f2fs_inode_info *fi = F2FS_I(inode);
 257         struct inmem_pages *cur, *tmp;
 258         struct f2fs_io_info fio = {
 259                 .sbi = sbi,
 260                 .type = DATA,
 261                 .op = REQ_OP_WRITE,
 262                 .op_flags = WRITE_SYNC | REQ_PRIO,
 263                 .encrypted_page = NULL,
 264         };
 265         bool submit_bio = false;
 266         int err = 0;
 267
 268         list_for_each_entry_safe(cur, tmp, &fi->inmem_pages, list) {
 269                 struct page *page = cur->page;
 270
 271                 lock_page(page);
 272                 if (page->mapping == inode->i_mapping) {
 273                         trace_f2fs_commit_inmem_page(page, INMEM);
 274
 275                         set_page_dirty(page);
 276                         f2fs_wait_on_page_writeback(page, DATA, true);
 277                         if (clear_page_dirty_for_io(page))
 278                                 inode_dec_dirty_pages(inode);
 279
 280                         fio.page = page;
 281                         err = do_write_data_page(&fio);
 282                         if (err) {
 283                                 unlock_page(page);
 284                                 break;
 285                         }
 286
 287                         /* record old blkaddr for revoking */
 288                         cur->old_addr = fio.old_blkaddr;
 289
 290                         clear_cold_data(page);
 291                         submit_bio = true;
 292                 }
 293                 unlock_page(page);
 294                 list_move_tail(&cur->list, revoke_list);
 295         }
 296
 297         if (submit_bio)
 298                 f2fs_submit_merged_bio_cond(sbi, inode, NULL, 0, DATA, WRITE);
 299
 300         if (!err)
 301                 __revoke_inmem_pages(inode, revoke_list, false, false);
 302
 303         return err;
 304 }
 305
 306 int commit_inmem_pages(struct inode *inode)
 307 {
 308         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 309         struct f2fs_inode_info *fi = F2FS_I(inode);
 310         struct list_head revoke_list;
 311         int err;
 312
 313         INIT_LIST_HEAD(&revoke_list);
 314         f2fs_balance_fs(sbi, true);
 315         f2fs_lock_op(sbi);
 316
 317         mutex_lock(&fi->inmem_lock);
 318         err = __commit_inmem_pages(inode, &revoke_list);
 319         if (err) {
 320                 int ret;
 321                 /*
 322                  * try to revoke all committed pages, but still we could fail
 323                  * due to no memory or other reason, if that happened, EAGAIN
 324                  * will be returned, which means in such case, transaction is
 325                  * already not integrity, caller should use journal to do the
 326                  * recovery or rewrite & commit last transaction. For other
 327                  * error number, revoking was done by filesystem itself.
 328                  */
 329                 ret = __revoke_inmem_pages(inode, &revoke_list, false, true);
 330                 if (ret)
 331                         err = ret;
 332
 333                 /* drop all uncommitted pages */
 334                 __revoke_inmem_pages(inode, &fi->inmem_pages, true, false);
 335         }
 336         mutex_unlock(&fi->inmem_lock);
 337
 338         f2fs_unlock_op(sbi);
 339         return err;
 340 }
 341
 342 /*
 343  * This function balances dirty node and dentry pages.
 344  * In addition, it controls garbage collection.
 345  */
 346 void f2fs_balance_fs(struct f2fs_sb_info *sbi, bool need)
 347 {
 348 #ifdef CONFIG_F2FS_FAULT_INJECTION
 349         if (time_to_inject(sbi, FAULT_CHECKPOINT))
 350                 f2fs_stop_checkpoint(sbi, false);
 351 #endif
 352
 353         if (!need)
 354                 return;
 355
 356         /* balance_fs_bg is able to be pending */
 357         if (excess_cached_nats(sbi))
 358                 f2fs_balance_fs_bg(sbi);
 359
 360         /*
 361          * We should do GC or end up with checkpoint, if there are so many dirty
 362          * dir/node pages without enough free segments.
 363          */
 364         if (has_not_enough_free_secs(sbi, 0, 0)) {
 365                 mutex_lock(&sbi->gc_mutex);
 366                 f2fs_gc(sbi, false);
 367         }
 368 }
 369
 370 void f2fs_balance_fs_bg(struct f2fs_sb_info *sbi)
 371 {
 372         /* try to shrink extent cache when there is no enough memory */
 373         if (!available_free_memory(sbi, EXTENT_CACHE))
 374                 f2fs_shrink_extent_tree(sbi, EXTENT_CACHE_SHRINK_NUMBER);
 375
 376         /* check the # of cached NAT entries */
 377         if (!available_free_memory(sbi, NAT_ENTRIES))
 378                 try_to_free_nats(sbi, NAT_ENTRY_PER_BLOCK);
 379
 380         if (!available_free_memory(sbi, FREE_NIDS))
 381                 try_to_free_nids(sbi, MAX_FREE_NIDS);
 382         else
 383                 build_free_nids(sbi);
 384
 385         /* checkpoint is the only way to shrink partial cached entries */
 386         if (!available_free_memory(sbi, NAT_ENTRIES) ||
 387                         !available_free_memory(sbi, INO_ENTRIES) ||
 388                         excess_prefree_segs(sbi) ||
 389                         excess_dirty_nats(sbi) ||
 390                         (is_idle(sbi) && f2fs_time_over(sbi, CP_TIME))) {
 391                 if (test_opt(sbi, DATA_FLUSH)) {
 392                         struct blk_plug plug;
 393
 394                         blk_start_plug(&plug);
 395                         sync_dirty_inodes(sbi, FILE_INODE);
 396                         blk_finish_plug(&plug);
 397                 }
 398                 f2fs_sync_fs(sbi->sb, true);
 399                 stat_inc_bg_cp_count(sbi->stat_info);
 400         }
 401 }
 402
 403 static int issue_flush_thread(void *data)
 404 {
 405         struct f2fs_sb_info *sbi = data;
 406         struct flush_cmd_control *fcc = SM_I(sbi)->cmd_control_info;
 407         wait_queue_head_t *q = &fcc->flush_wait_queue;
 408 repeat:
 409         if (kthread_should_stop())
 410                 return 0;
 411
 412         if (!llist_empty(&fcc->issue_list)) {
 413                 struct bio *bio;
 414                 struct flush_cmd *cmd, *next;
 415                 int ret;
 416
 417                 bio = f2fs_bio_alloc(0);
 418
 419                 fcc->dispatch_list = llist_del_all(&fcc->issue_list);
 420                 fcc->dispatch_list = llist_reverse_order(fcc->dispatch_list);
 421
 422                 bio->bi_bdev = sbi->sb->s_bdev;
 423                 bio_set_op_attrs(bio, REQ_OP_WRITE, WRITE_FLUSH);
 424                 ret = submit_bio_wait(bio);
 425
 426                 llist_for_each_entry_safe(cmd, next,
 427                                           fcc->dispatch_list, llnode) {
 428                         cmd->ret = ret;
 429                         complete(&cmd->wait);
 430                 }
 431                 bio_put(bio);
 432                 fcc->dispatch_list = NULL;
 433         }
 434
 435         wait_event_interruptible(*q,
 436                 kthread_should_stop() || !llist_empty(&fcc->issue_list));
 437         goto repeat;
 438 }
 439
 440 int f2fs_issue_flush(struct f2fs_sb_info *sbi)
 441 {
 442         struct flush_cmd_control *fcc = SM_I(sbi)->cmd_control_info;
 443         struct flush_cmd cmd;
 444
 445         trace_f2fs_issue_flush(sbi->sb, test_opt(sbi, NOBARRIER),
 446                                         test_opt(sbi, FLUSH_MERGE));
 447
 448         if (test_opt(sbi, NOBARRIER))
 449                 return 0;
 450
 451         if (!test_opt(sbi, FLUSH_MERGE) || !atomic_read(&fcc->submit_flush)) {
 452                 struct bio *bio = f2fs_bio_alloc(0);
 453                 int ret;
 454
 455                 atomic_inc(&fcc->submit_flush);
 456                 bio->bi_bdev = sbi->sb->s_bdev;
 457                 bio_set_op_attrs(bio, REQ_OP_WRITE, WRITE_FLUSH);
 458                 ret = submit_bio_wait(bio);
 459                 atomic_dec(&fcc->submit_flush);
 460                 bio_put(bio);
 461                 return ret;
 462         }
 463
 464         init_completion(&cmd.wait);
 465
 466         atomic_inc(&fcc->submit_flush);
 467         llist_add(&cmd.llnode, &fcc->issue_list);
 468
 469         if (!fcc->dispatch_list)
 470                 wake_up(&fcc->flush_wait_queue);
 471
 472         wait_for_completion(&cmd.wait);
 473         atomic_dec(&fcc->submit_flush);
 474
 475         return cmd.ret;
 476 }
 477
 478 int create_flush_cmd_control(struct f2fs_sb_info *sbi)
 479 {
 480         dev_t dev = sbi->sb->s_bdev->bd_dev;
 481         struct flush_cmd_control *fcc;
 482         int err = 0;
 483
 484         fcc = kzalloc(sizeof(struct flush_cmd_control), GFP_KERNEL);
 485         if (!fcc)
 486                 return -ENOMEM;
 487         atomic_set(&fcc->submit_flush, 0);
 488         init_waitqueue_head(&fcc->flush_wait_queue);
 489         init_llist_head(&fcc->issue_list);
 490         SM_I(sbi)->cmd_control_info = fcc;
 491         fcc->f2fs_issue_flush = kthread_run(issue_flush_thread, sbi,
 492                                 "f2fs_flush-%u:%u", MAJOR(dev), MINOR(dev));
 493         if (IS_ERR(fcc->f2fs_issue_flush)) {
 494                 err = PTR_ERR(fcc->f2fs_issue_flush);
 495                 kfree(fcc);
 496                 SM_I(sbi)->cmd_control_info = NULL;
 497                 return err;
 498         }
 499
 500         return err;
 501 }
 502
 503 void destroy_flush_cmd_control(struct f2fs_sb_info *sbi)
 504 {
 505         struct flush_cmd_control *fcc = SM_I(sbi)->cmd_control_info;
 506
 507         if (fcc && fcc->f2fs_issue_flush)
 508                 kthread_stop(fcc->f2fs_issue_flush);
 509         kfree(fcc);
 510         SM_I(sbi)->cmd_control_info = NULL;
 511 }
 512
 513 static void __locate_dirty_segment(struct f2fs_sb_info *sbi, unsigned int segno,
 514                 enum dirty_type dirty_type)
 515 {
 516         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
 517
 518         /* need not be added */
 519         if (IS_CURSEG(sbi, segno))
 520                 return;
 521
 522         if (!test_and_set_bit(segno, dirty_i->dirty_segmap[dirty_type]))
 523                 dirty_i->nr_dirty[dirty_type]++;
 524
 525         if (dirty_type == DIRTY) {
 526                 struct seg_entry *sentry = get_seg_entry(sbi, segno);
 527                 enum dirty_type t = sentry->type;
 528
 529                 if (unlikely(t >= DIRTY)) {
 530                         f2fs_bug_on(sbi, 1);
 531                         return;
 532                 }
 533                 if (!test_and_set_bit(segno, dirty_i->dirty_segmap[t]))
 534                         dirty_i->nr_dirty[t]++;
 535         }
 536 }
 537
 538 static void __remove_dirty_segment(struct f2fs_sb_info *sbi, unsigned int segno,
 539                 enum dirty_type dirty_type)
 540 {
 541         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
 542
 543         if (test_and_clear_bit(segno, dirty_i->dirty_segmap[dirty_type]))
 544                 dirty_i->nr_dirty[dirty_type]--;
 545
 546         if (dirty_type == DIRTY) {
 547                 struct seg_entry *sentry = get_seg_entry(sbi, segno);
 548                 enum dirty_type t = sentry->type;
 549
 550                 if (test_and_clear_bit(segno, dirty_i->dirty_segmap[t]))
 551                         dirty_i->nr_dirty[t]--;
 552
 553                 if (get_valid_blocks(sbi, segno, sbi->segs_per_sec) == 0)
 554                         clear_bit(GET_SECNO(sbi, segno),
 555                                                 dirty_i->victim_secmap);
 556         }
 557 }
 558
 559 /*
 560  * Should not occur error such as -ENOMEM.
 561  * Adding dirty entry into seglist is not critical operation.
 562  * If a given segment is one of current working segments, it won't be added.
 563  */
 564 static void locate_dirty_segment(struct f2fs_sb_info *sbi, unsigned int segno)
 565 {
 566         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
 567         unsigned short valid_blocks;
 568
 569         if (segno == NULL_SEGNO || IS_CURSEG(sbi, segno))
 570                 return;
 571
 572         mutex_lock(&dirty_i->seglist_lock);
 573
 574         valid_blocks = get_valid_blocks(sbi, segno, 0);
 575
 576         if (valid_blocks == 0) {
 577                 __locate_dirty_segment(sbi, segno, PRE);
 578                 __remove_dirty_segment(sbi, segno, DIRTY);
 579         } else if (valid_blocks < sbi->blocks_per_seg) {
 580                 __locate_dirty_segment(sbi, segno, DIRTY);
 581         } else {
 582                 /* Recovery routine with SSR needs this */
 583                 __remove_dirty_segment(sbi, segno, DIRTY);
 584         }
 585
 586         mutex_unlock(&dirty_i->seglist_lock);
 587 }
 588
 589 static struct bio_entry *__add_bio_entry(struct f2fs_sb_info *sbi,
 590                                                         struct bio *bio)
 591 {
 592         struct list_head *wait_list = &(SM_I(sbi)->wait_list);
 593         struct bio_entry *be = f2fs_kmem_cache_alloc(bio_entry_slab, GFP_NOFS);
 594
 595         INIT_LIST_HEAD(&be->list);
 596         be->bio = bio;
 597         init_completion(&be->event);
 598         list_add_tail(&be->list, wait_list);
 599
 600         return be;
 601 }
 602
 603 void f2fs_wait_all_discard_bio(struct f2fs_sb_info *sbi)
 604 {
 605         struct list_head *wait_list = &(SM_I(sbi)->wait_list);
 606         struct bio_entry *be, *tmp;
 607
 608         list_for_each_entry_safe(be, tmp, wait_list, list) {
 609                 struct bio *bio = be->bio;
 610                 int err;
 611
 612                 wait_for_completion_io(&be->event);
 613                 err = be->error;
 614                 if (err == -EOPNOTSUPP)
 615                         err = 0;
 616
 617                 if (err)
 618                         f2fs_msg(sbi->sb, KERN_INFO,
 619                                 "Issue discard failed, ret: %d", err);
 620
 621                 bio_put(bio);
 622                 list_del(&be->list);
 623                 kmem_cache_free(bio_entry_slab, be);
 624         }
 625 }
 626
 627 static void f2fs_submit_bio_wait_endio(struct bio *bio)
 628 {
 629         struct bio_entry *be = (struct bio_entry *)bio->bi_private;
 630
 631         be->error = bio->bi_error;
 632         complete(&be->event);
 633 }
 634
 635 /* this function is copied from blkdev_issue_discard from block/blk-lib.c */
 636 int __f2fs_issue_discard_async(struct f2fs_sb_info *sbi, sector_t sector,
 637                 sector_t nr_sects, gfp_t gfp_mask, unsigned long flags)
 638 {
 639         struct block_device *bdev = sbi->sb->s_bdev;
 640         struct bio *bio = NULL;
 641         int err;
 642
 643         err = __blkdev_issue_discard(bdev, sector, nr_sects, gfp_mask, flags,
 644                         &bio);
 645         if (!err && bio) {
 646                 struct bio_entry *be = __add_bio_entry(sbi, bio);
 647
 648                 bio->bi_private = be;
 649                 bio->bi_end_io = f2fs_submit_bio_wait_endio;
 650                 bio->bi_opf |= REQ_SYNC;
 651                 submit_bio(bio);
 652         }
 653
 654         return err;
 655 }
 656
 657 static int f2fs_issue_discard(struct f2fs_sb_info *sbi,
 658                                 block_t blkstart, block_t blklen)
 659 {
 660         sector_t start = SECTOR_FROM_BLOCK(blkstart);
 661         sector_t len = SECTOR_FROM_BLOCK(blklen);
 662         struct seg_entry *se;
 663         unsigned int offset;
 664         block_t i;
 665
 666         for (i = blkstart; i < blkstart + blklen; i++) {
 667                 se = get_seg_entry(sbi, GET_SEGNO(sbi, i));
 668                 offset = GET_BLKOFF_FROM_SEG0(sbi, i);
 669
 670                 if (!f2fs_test_and_set_bit(offset, se->discard_map))
 671                         sbi->discard_blks--;
 672         }
 673         trace_f2fs_issue_discard(sbi->sb, blkstart, blklen);
 674         return __f2fs_issue_discard_async(sbi, start, len, GFP_NOFS, 0);
 675 }
 676
 677 static void __add_discard_entry(struct f2fs_sb_info *sbi,
 678                 struct cp_control *cpc, struct seg_entry *se,
 679                 unsigned int start, unsigned int end)
 680 {
 681         struct list_head *head = &SM_I(sbi)->discard_list;
 682         struct discard_entry *new, *last;
 683
 684         if (!list_empty(head)) {
 685                 last = list_last_entry(head, struct discard_entry, list);
 686                 if (START_BLOCK(sbi, cpc->trim_start) + start ==
 687                                                 last->blkaddr + last->len) {
 688                         last->len += end - start;
 689                         goto done;
 690                 }
 691         }
 692
 693         new = f2fs_kmem_cache_alloc(discard_entry_slab, GFP_NOFS);
 694         INIT_LIST_HEAD(&new->list);
 695         new->blkaddr = START_BLOCK(sbi, cpc->trim_start) + start;
 696         new->len = end - start;
 697         list_add_tail(&new->list, head);
 698 done:
 699         SM_I(sbi)->nr_discards += end - start;
 700 }
 701
 702 static void add_discard_addrs(struct f2fs_sb_info *sbi, struct cp_control *cpc)
 703 {
 704         int entries = SIT_VBLOCK_MAP_SIZE / sizeof(unsigned long);
 705         int max_blocks = sbi->blocks_per_seg;
 706         struct seg_entry *se = get_seg_entry(sbi, cpc->trim_start);
 707         unsigned long *cur_map = (unsigned long *)se->cur_valid_map;
 708         unsigned long *ckpt_map = (unsigned long *)se->ckpt_valid_map;
 709         unsigned long *discard_map = (unsigned long *)se->discard_map;
 710         unsigned long *dmap = SIT_I(sbi)->tmp_map;
 711         unsigned int start = 0, end = -1;
 712         bool force = (cpc->reason == CP_DISCARD);
 713         int i;
 714
 715         if (se->valid_blocks == max_blocks || !f2fs_discard_en(sbi))
 716                 return;
 717
 718         if (!force) {
 719                 if (!test_opt(sbi, DISCARD) || !se->valid_blocks ||
 720                     SM_I(sbi)->nr_discards >= SM_I(sbi)->max_discards)
 721                         return;
 722         }
 723
 724         /* SIT_VBLOCK_MAP_SIZE should be multiple of sizeof(unsigned long) */
 725         for (i = 0; i < entries; i++)
 726                 dmap[i] = force ? ~ckpt_map[i] & ~discard_map[i] :
 727                                 (cur_map[i] ^ ckpt_map[i]) & ckpt_map[i];
 728
 729         while (force || SM_I(sbi)->nr_discards <= SM_I(sbi)->max_discards) {
 730                 start = __find_rev_next_bit(dmap, max_blocks, end + 1);
 731                 if (start >= max_blocks)
 732                         break;
 733
 734                 end = __find_rev_next_zero_bit(dmap, max_blocks, start + 1);
 735                 if (force && start && end != max_blocks
 736                                         && (end - start) < cpc->trim_minlen)
 737                         continue;
 738
 739                 __add_discard_entry(sbi, cpc, se, start, end);
 740         }
 741 }
 742
 743 void release_discard_addrs(struct f2fs_sb_info *sbi)
 744 {
 745         struct list_head *head = &(SM_I(sbi)->discard_list);
 746         struct discard_entry *entry, *this;
 747
 748         /* drop caches */
 749         list_for_each_entry_safe(entry, this, head, list) {
 750                 list_del(&entry->list);
 751                 kmem_cache_free(discard_entry_slab, entry);
 752         }
 753 }
 754
 755 /*
 756  * Should call clear_prefree_segments after checkpoint is done.
 757  */
 758 static void set_prefree_as_free_segments(struct f2fs_sb_info *sbi)
 759 {
 760         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
 761         unsigned int segno;
 762
 763         mutex_lock(&dirty_i->seglist_lock);
 764         for_each_set_bit(segno, dirty_i->dirty_segmap[PRE], MAIN_SEGS(sbi))
 765                 __set_test_and_free(sbi, segno);
 766         mutex_unlock(&dirty_i->seglist_lock);
 767 }
 768
 769 void clear_prefree_segments(struct f2fs_sb_info *sbi, struct cp_control *cpc)
 770 {
 771         struct list_head *head = &(SM_I(sbi)->discard_list);
 772         struct discard_entry *entry, *this;
 773         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
 774         struct blk_plug plug;
 775         unsigned long *prefree_map = dirty_i->dirty_segmap[PRE];
 776         unsigned int start = 0, end = -1;
 777         unsigned int secno, start_segno;
 778         bool force = (cpc->reason == CP_DISCARD);
 779
 780         blk_start_plug(&plug);
 781
 782         mutex_lock(&dirty_i->seglist_lock);
 783
 784         while (1) {
 785                 int i;
 786                 start = find_next_bit(prefree_map, MAIN_SEGS(sbi), end + 1);
 787                 if (start >= MAIN_SEGS(sbi))
 788                         break;
 789                 end = find_next_zero_bit(prefree_map, MAIN_SEGS(sbi),
 790                                                                 start + 1);
 791
 792                 for (i = start; i < end; i++)
 793                         clear_bit(i, prefree_map);
 794
 795                 dirty_i->nr_dirty[PRE] -= end - start;
 796
 797                 if (force || !test_opt(sbi, DISCARD))
 798                         continue;
 799
 800                 if (!test_opt(sbi, LFS) || sbi->segs_per_sec == 1) {
 801                         f2fs_issue_discard(sbi, START_BLOCK(sbi, start),
 802                                 (end - start) << sbi->log_blocks_per_seg);
 803                         continue;
 804                 }
 805 next:
 806                 secno = GET_SECNO(sbi, start);
 807                 start_segno = secno * sbi->segs_per_sec;
 808                 if (!IS_CURSEC(sbi, secno) &&
 809                         !get_valid_blocks(sbi, start, sbi->segs_per_sec))
 810                         f2fs_issue_discard(sbi, START_BLOCK(sbi, start_segno),
 811                                 sbi->segs_per_sec << sbi->log_blocks_per_seg);
 812
 813                 start = start_segno + sbi->segs_per_sec;
 814                 if (start < end)
 815                         goto next;
 816                 else
 817                         end = start - 1;
 818         }
 819         mutex_unlock(&dirty_i->seglist_lock);
 820
 821         /* send small discards */
 822         list_for_each_entry_safe(entry, this, head, list) {
 823                 if (force && entry->len < cpc->trim_minlen)
 824                         goto skip;
 825                 f2fs_issue_discard(sbi, entry->blkaddr, entry->len);
 826                 cpc->trimmed += entry->len;
 827 skip:
 828                 list_del(&entry->list);
 829                 SM_I(sbi)->nr_discards -= entry->len;
 830                 kmem_cache_free(discard_entry_slab, entry);
 831         }
 832
 833         blk_finish_plug(&plug);
 834 }
 835
 836 static bool __mark_sit_entry_dirty(struct f2fs_sb_info *sbi, unsigned int segno)
 837 {
 838         struct sit_info *sit_i = SIT_I(sbi);
 839
 840         if (!__test_and_set_bit(segno, sit_i->dirty_sentries_bitmap)) {
 841                 sit_i->dirty_sentries++;
 842                 return false;
 843         }
 844
 845         return true;
 846 }
 847
 848 static void __set_sit_entry_type(struct f2fs_sb_info *sbi, int type,
 849                                         unsigned int segno, int modified)
 850 {
 851         struct seg_entry *se = get_seg_entry(sbi, segno);
 852         se->type = type;
 853         if (modified)
 854                 __mark_sit_entry_dirty(sbi, segno);
 855 }
 856
 857 static void update_sit_entry(struct f2fs_sb_info *sbi, block_t blkaddr, int del)
 858 {
 859         struct seg_entry *se;
 860         unsigned int segno, offset;
 861         long int new_vblocks;
 862
 863         segno = GET_SEGNO(sbi, blkaddr);
 864
 865         se = get_seg_entry(sbi, segno);
 866         new_vblocks = se->valid_blocks + del;
 867         offset = GET_BLKOFF_FROM_SEG0(sbi, blkaddr);
 868
 869         f2fs_bug_on(sbi, (new_vblocks >> (sizeof(unsigned short) << 3) ||
 870                                 (new_vblocks > sbi->blocks_per_seg)));
 871
 872         se->valid_blocks = new_vblocks;
 873         se->mtime = get_mtime(sbi);
 874         SIT_I(sbi)->max_mtime = se->mtime;
 875
 876         /* Update valid block bitmap */
 877         if (del > 0) {
 878                 if (f2fs_test_and_set_bit(offset, se->cur_valid_map))
 879                         f2fs_bug_on(sbi, 1);
 880                 if (f2fs_discard_en(sbi) &&
 881                         !f2fs_test_and_set_bit(offset, se->discard_map))
 882                         sbi->discard_blks--;
 883         } else {
 884                 if (!f2fs_test_and_clear_bit(offset, se->cur_valid_map))
 885                         f2fs_bug_on(sbi, 1);
 886                 if (f2fs_discard_en(sbi) &&
 887                         f2fs_test_and_clear_bit(offset, se->discard_map))
 888                         sbi->discard_blks++;
 889         }
 890         if (!f2fs_test_bit(offset, se->ckpt_valid_map))
 891                 se->ckpt_valid_blocks += del;
 892
 893         __mark_sit_entry_dirty(sbi, segno);
 894
 895         /* update total number of valid blocks to be written in ckpt area */
 896         SIT_I(sbi)->written_valid_blocks += del;
 897
 898         if (sbi->segs_per_sec > 1)
 899                 get_sec_entry(sbi, segno)->valid_blocks += del;
 900 }
 901
 902 void refresh_sit_entry(struct f2fs_sb_info *sbi, block_t old, block_t new)
 903 {
 904         update_sit_entry(sbi, new, 1);
 905         if (GET_SEGNO(sbi, old) != NULL_SEGNO)
 906                 update_sit_entry(sbi, old, -1);
 907
 908         locate_dirty_segment(sbi, GET_SEGNO(sbi, old));
 909         locate_dirty_segment(sbi, GET_SEGNO(sbi, new));
 910 }
 911
 912 void invalidate_blocks(struct f2fs_sb_info *sbi, block_t addr)
 913 {
 914         unsigned int segno = GET_SEGNO(sbi, addr);
 915         struct sit_info *sit_i = SIT_I(sbi);
 916
 917         f2fs_bug_on(sbi, addr == NULL_ADDR);
 918         if (addr == NEW_ADDR)
 919                 return;
 920
 921         /* add it into sit main buffer */
 922         mutex_lock(&sit_i->sentry_lock);
 923
 924         update_sit_entry(sbi, addr, -1);
 925
 926         /* add it into dirty seglist */
 927         locate_dirty_segment(sbi, segno);
 928
 929         mutex_unlock(&sit_i->sentry_lock);
 930 }
 931
 932 bool is_checkpointed_data(struct f2fs_sb_info *sbi, block_t blkaddr)
 933 {
 934         struct sit_info *sit_i = SIT_I(sbi);
 935         unsigned int segno, offset;
 936         struct seg_entry *se;
 937         bool is_cp = false;
 938
 939         if (blkaddr == NEW_ADDR || blkaddr == NULL_ADDR)
 940                 return true;
 941
 942         mutex_lock(&sit_i->sentry_lock);
 943
 944         segno = GET_SEGNO(sbi, blkaddr);
 945         se = get_seg_entry(sbi, segno);
 946         offset = GET_BLKOFF_FROM_SEG0(sbi, blkaddr);
 947
 948         if (f2fs_test_bit(offset, se->ckpt_valid_map))
 949                 is_cp = true;
 950
 951         mutex_unlock(&sit_i->sentry_lock);
 952
 953         return is_cp;
 954 }
 955
 956 /*
 957  * This function should be resided under the curseg_mutex lock
 958  */
 959 static void __add_sum_entry(struct f2fs_sb_info *sbi, int type,
 960                                         struct f2fs_summary *sum)
 961 {
 962         struct curseg_info *curseg = CURSEG_I(sbi, type);
 963         void *addr = curseg->sum_blk;
 964         addr += curseg->next_blkoff * sizeof(struct f2fs_summary);
 965         memcpy(addr, sum, sizeof(struct f2fs_summary));
 966 }
 967
 968 /*
 969  * Calculate the number of current summary pages for writing
 970  */
 971 int npages_for_summary_flush(struct f2fs_sb_info *sbi, bool for_ra)
 972 {
 973         int valid_sum_count = 0;
 974         int i, sum_in_page;
 975
 976         for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++) {
 977                 if (sbi->ckpt->alloc_type[i] == SSR)
 978                         valid_sum_count += sbi->blocks_per_seg;
 979                 else {
 980                         if (for_ra)
 981                                 valid_sum_count += le16_to_cpu(
 982                                         F2FS_CKPT(sbi)->cur_data_blkoff[i]);
 983                         else
 984                                 valid_sum_count += curseg_blkoff(sbi, i);
 985                 }
 986         }
 987
 988         sum_in_page = (PAGE_SIZE - 2 * SUM_JOURNAL_SIZE -
 989                         SUM_FOOTER_SIZE) / SUMMARY_SIZE;
 990         if (valid_sum_count <= sum_in_page)
 991                 return 1;
 992         else if ((valid_sum_count - sum_in_page) <=
 993                 (PAGE_SIZE - SUM_FOOTER_SIZE) / SUMMARY_SIZE)
 994                 return 2;
 995         return 3;
 996 }
 997
 998 /*
 999  * Caller should put this summary page
1000  */
1001 struct page *get_sum_page(struct f2fs_sb_info *sbi, unsigned int segno)
1002 {
1003         return get_meta_page(sbi, GET_SUM_BLOCK(sbi, segno));
1004 }
1005
1006 void update_meta_page(struct f2fs_sb_info *sbi, void *src, block_t blk_addr)
1007 {
1008         struct page *page = grab_meta_page(sbi, blk_addr);
1009         void *dst = page_address(page);
1010
1011         if (src)
1012                 memcpy(dst, src, PAGE_SIZE);
1013         else
1014                 memset(dst, 0, PAGE_SIZE);
1015         set_page_dirty(page);
1016         f2fs_put_page(page, 1);
1017 }
1018
1019 static void write_sum_page(struct f2fs_sb_info *sbi,
1020                         struct f2fs_summary_block *sum_blk, block_t blk_addr)
1021 {
1022         update_meta_page(sbi, (void *)sum_blk, blk_addr);
1023 }
1024
1025 static void write_current_sum_page(struct f2fs_sb_info *sbi,
1026                                                 int type, block_t blk_addr)
1027 {
1028         struct curseg_info *curseg = CURSEG_I(sbi, type);
1029         struct page *page = grab_meta_page(sbi, blk_addr);
1030         struct f2fs_summary_block *src = curseg->sum_blk;
1031         struct f2fs_summary_block *dst;
1032
1033         dst = (struct f2fs_summary_block *)page_address(page);
1034
1035         mutex_lock(&curseg->curseg_mutex);
1036
1037         down_read(&curseg->journal_rwsem);
1038         memcpy(&dst->journal, curseg->journal, SUM_JOURNAL_SIZE);
1039         up_read(&curseg->journal_rwsem);
1040
1041         memcpy(dst->entries, src->entries, SUM_ENTRY_SIZE);
1042         memcpy(&dst->footer, &src->footer, SUM_FOOTER_SIZE);
1043
1044         mutex_unlock(&curseg->curseg_mutex);
1045
1046         set_page_dirty(page);
1047         f2fs_put_page(page, 1);
1048 }
1049
1050 static int is_next_segment_free(struct f2fs_sb_info *sbi, int type)
1051 {
1052         struct curseg_info *curseg = CURSEG_I(sbi, type);
1053         unsigned int segno = curseg->segno + 1;
1054         struct free_segmap_info *free_i = FREE_I(sbi);
1055
1056         if (segno < MAIN_SEGS(sbi) && segno % sbi->segs_per_sec)
1057                 return !test_bit(segno, free_i->free_segmap);
1058         return 0;
1059 }
1060
1061 /*
1062  * Find a new segment from the free segments bitmap to right order
1063  * This function should be returned with success, otherwise BUG
1064  */
1065 static void get_new_segment(struct f2fs_sb_info *sbi,
1066                         unsigned int *newseg, bool new_sec, int dir)
1067 {
1068         struct free_segmap_info *free_i = FREE_I(sbi);
1069         unsigned int segno, secno, zoneno;
1070         unsigned int total_zones = MAIN_SECS(sbi) / sbi->secs_per_zone;
1071         unsigned int hint = *newseg / sbi->segs_per_sec;
1072         unsigned int old_zoneno = GET_ZONENO_FROM_SEGNO(sbi, *newseg);
1073         unsigned int left_start = hint;
1074         bool init = true;
1075         int go_left = 0;
1076         int i;
1077
1078         spin_lock(&free_i->segmap_lock);
1079
1080         if (!new_sec && ((*newseg + 1) % sbi->segs_per_sec)) {
1081                 segno = find_next_zero_bit(free_i->free_segmap,
1082                                 (hint + 1) * sbi->segs_per_sec, *newseg + 1);
1083                 if (segno < (hint + 1) * sbi->segs_per_sec)
1084                         goto got_it;
1085         }
1086 find_other_zone:
1087         secno = find_next_zero_bit(free_i->free_secmap, MAIN_SECS(sbi), hint);
1088         if (secno >= MAIN_SECS(sbi)) {
1089                 if (dir == ALLOC_RIGHT) {
1090                         secno = find_next_zero_bit(free_i->free_secmap,
1091                                                         MAIN_SECS(sbi), 0);
1092                         f2fs_bug_on(sbi, secno >= MAIN_SECS(sbi));
1093                 } else {
1094                         go_left = 1;
1095                         left_start = hint - 1;
1096                 }
1097         }
1098         if (go_left == 0)
1099                 goto skip_left;
1100
1101         while (test_bit(left_start, free_i->free_secmap)) {
1102                 if (left_start > 0) {
1103                         left_start--;
1104                         continue;
1105                 }
1106                 left_start = find_next_zero_bit(free_i->free_secmap,
1107                                                         MAIN_SECS(sbi), 0);
1108                 f2fs_bug_on(sbi, left_start >= MAIN_SECS(sbi));
1109                 break;
1110         }
1111         secno = left_start;
1112 skip_left:
1113         hint = secno;
1114         segno = secno * sbi->segs_per_sec;
1115         zoneno = secno / sbi->secs_per_zone;
1116
1117         /* give up on finding another zone */
1118         if (!init)
1119                 goto got_it;
1120         if (sbi->secs_per_zone == 1)
1121                 goto got_it;
1122         if (zoneno == old_zoneno)
1123                 goto got_it;
1124         if (dir == ALLOC_LEFT) {
1125                 if (!go_left && zoneno + 1 >= total_zones)
1126                         goto got_it;
1127                 if (go_left && zoneno == 0)
1128                         goto got_it;
1129         }
1130         for (i = 0; i < NR_CURSEG_TYPE; i++)
1131                 if (CURSEG_I(sbi, i)->zone == zoneno)
1132                         break;
1133
1134         if (i < NR_CURSEG_TYPE) {
1135                 /* zone is in user, try another */
1136                 if (go_left)
1137                         hint = zoneno * sbi->secs_per_zone - 1;
1138                 else if (zoneno + 1 >= total_zones)
1139                         hint = 0;
1140                 else
1141                         hint = (zoneno + 1) * sbi->secs_per_zone;
1142                 init = false;
1143                 goto find_other_zone;
1144         }
1145 got_it:
1146         /* set it as dirty segment in free segmap */
1147         f2fs_bug_on(sbi, test_bit(segno, free_i->free_segmap));
1148         __set_inuse(sbi, segno);
1149         *newseg = segno;
1150         spin_unlock(&free_i->segmap_lock);
1151 }
1152
1153 static void reset_curseg(struct f2fs_sb_info *sbi, int type, int modified)
1154 {
1155         struct curseg_info *curseg = CURSEG_I(sbi, type);
1156         struct summary_footer *sum_footer;
1157
1158         curseg->segno = curseg->next_segno;
1159         curseg->zone = GET_ZONENO_FROM_SEGNO(sbi, curseg->segno);
1160         curseg->next_blkoff = 0;
1161         curseg->next_segno = NULL_SEGNO;
1162
1163         sum_footer = &(curseg->sum_blk->footer);
1164         memset(sum_footer, 0, sizeof(struct summary_footer));
1165         if (IS_DATASEG(type))
1166                 SET_SUM_TYPE(sum_footer, SUM_TYPE_DATA);
1167         if (IS_NODESEG(type))
1168                 SET_SUM_TYPE(sum_footer, SUM_TYPE_NODE);
1169         __set_sit_entry_type(sbi, type, curseg->segno, modified);
1170 }
1171
1172 /*
1173  * Allocate a current working segment.
1174  * This function always allocates a free segment in LFS manner.
1175  */
1176 static void new_curseg(struct f2fs_sb_info *sbi, int type, bool new_sec)
1177 {
1178         struct curseg_info *curseg = CURSEG_I(sbi, type);
1179         unsigned int segno = curseg->segno;
1180         int dir = ALLOC_LEFT;
1181
1182         write_sum_page(sbi, curseg->sum_blk,
1183                                 GET_SUM_BLOCK(sbi, segno));
1184         if (type == CURSEG_WARM_DATA || type == CURSEG_COLD_DATA)
1185                 dir = ALLOC_RIGHT;
1186
1187         if (test_opt(sbi, NOHEAP))
1188                 dir = ALLOC_RIGHT;
1189
1190         get_new_segment(sbi, &segno, new_sec, dir);
1191         curseg->next_segno = segno;
1192         reset_curseg(sbi, type, 1);
1193         curseg->alloc_type = LFS;
1194 }
1195
1196 static void __next_free_blkoff(struct f2fs_sb_info *sbi,
1197                         struct curseg_info *seg, block_t start)
1198 {
1199         struct seg_entry *se = get_seg_entry(sbi, seg->segno);
1200         int entries = SIT_VBLOCK_MAP_SIZE / sizeof(unsigned long);
1201         unsigned long *target_map = SIT_I(sbi)->tmp_map;
1202         unsigned long *ckpt_map = (unsigned long *)se->ckpt_valid_map;
1203         unsigned long *cur_map = (unsigned long *)se->cur_valid_map;
1204         int i, pos;
1205
1206         for (i = 0; i < entries; i++)
1207                 target_map[i] = ckpt_map[i] | cur_map[i];
1208
1209         pos = __find_rev_next_zero_bit(target_map, sbi->blocks_per_seg, start);
1210
1211         seg->next_blkoff = pos;
1212 }
1213
1214 /*
1215  * If a segment is written by LFS manner, next block offset is just obtained
1216  * by increasing the current block offset. However, if a segment is written by
1217  * SSR manner, next block offset obtained by calling __next_free_blkoff
1218  */
1219 static void __refresh_next_blkoff(struct f2fs_sb_info *sbi,
1220                                 struct curseg_info *seg)
1221 {
1222         if (seg->alloc_type == SSR)
1223                 __next_free_blkoff(sbi, seg, seg->next_blkoff + 1);
1224         else
1225                 seg->next_blkoff++;
1226 }
1227
1228 /*
1229  * This function always allocates a used segment(from dirty seglist) by SSR
1230  * manner, so it should recover the existing segment information of valid blocks
1231  */
1232 static void change_curseg(struct f2fs_sb_info *sbi, int type, bool reuse)
1233 {
1234         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
1235         struct curseg_info *curseg = CURSEG_I(sbi, type);
1236         unsigned int new_segno = curseg->next_segno;
1237         struct f2fs_summary_block *sum_node;
1238         struct page *sum_page;
1239
1240         write_sum_page(sbi, curseg->sum_blk,
1241                                 GET_SUM_BLOCK(sbi, curseg->segno));
1242         __set_test_and_inuse(sbi, new_segno);
1243
1244         mutex_lock(&dirty_i->seglist_lock);
1245         __remove_dirty_segment(sbi, new_segno, PRE);
1246         __remove_dirty_segment(sbi, new_segno, DIRTY);
1247         mutex_unlock(&dirty_i->seglist_lock);
1248
1249         reset_curseg(sbi, type, 1);
1250         curseg->alloc_type = SSR;
1251         __next_free_blkoff(sbi, curseg, 0);
1252
1253         if (reuse) {
1254                 sum_page = get_sum_page(sbi, new_segno);
1255                 sum_node = (struct f2fs_summary_block *)page_address(sum_page);
1256                 memcpy(curseg->sum_blk, sum_node, SUM_ENTRY_SIZE);
1257                 f2fs_put_page(sum_page, 1);
1258         }
1259 }
1260
1261 static int get_ssr_segment(struct f2fs_sb_info *sbi, int type)
1262 {
1263         struct curseg_info *curseg = CURSEG_I(sbi, type);
1264         const struct victim_selection *v_ops = DIRTY_I(sbi)->v_ops;
1265
1266         if (IS_NODESEG(type))
1267                 return v_ops->get_victim(sbi,
1268                                 &(curseg)->next_segno, BG_GC, type, SSR);
1269
1270         /* For data segments, let's do SSR more intensively */
1271         for (; type >= CURSEG_HOT_DATA; type--)
1272                 if (v_ops->get_victim(sbi, &(curseg)->next_segno,
1273                                                 BG_GC, type, SSR))
1274                         return 1;
1275         return 0;
1276 }
1277
1278 /*
1279  * flush out current segment and replace it with new segment
1280  * This function should be returned with success, otherwise BUG
1281  */
1282 static void allocate_segment_by_default(struct f2fs_sb_info *sbi,
1283                                                 int type, bool force)
1284 {
1285         struct curseg_info *curseg = CURSEG_I(sbi, type);
1286
1287         if (force)
1288                 new_curseg(sbi, type, true);
1289         else if (type == CURSEG_WARM_NODE)
1290                 new_curseg(sbi, type, false);
1291         else if (curseg->alloc_type == LFS && is_next_segment_free(sbi, type))
1292                 new_curseg(sbi, type, false);
1293         else if (need_SSR(sbi) && get_ssr_segment(sbi, type))
1294                 change_curseg(sbi, type, true);
1295         else
1296                 new_curseg(sbi, type, false);
1297
1298         stat_inc_seg_type(sbi, curseg);
1299 }
1300
1301 static void __allocate_new_segments(struct f2fs_sb_info *sbi, int type)
1302 {
1303         struct curseg_info *curseg = CURSEG_I(sbi, type);
1304         unsigned int old_segno;
1305
1306         old_segno = curseg->segno;
1307         SIT_I(sbi)->s_ops->allocate_segment(sbi, type, true);
1308         locate_dirty_segment(sbi, old_segno);
1309 }
1310
1311 void allocate_new_segments(struct f2fs_sb_info *sbi)
1312 {
1313         int i;
1314
1315         if (test_opt(sbi, LFS))
1316                 return;
1317
1318         for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++)
1319                 __allocate_new_segments(sbi, i);
1320 }
1321
1322 static const struct segment_allocation default_salloc_ops = {
1323         .allocate_segment = allocate_segment_by_default,
1324 };
1325
1326 int f2fs_trim_fs(struct f2fs_sb_info *sbi, struct fstrim_range *range)
1327 {
1328         __u64 start = F2FS_BYTES_TO_BLK(range->start);
1329         __u64 end = start + F2FS_BYTES_TO_BLK(range->len) - 1;
1330         unsigned int start_segno, end_segno;
1331         struct cp_control cpc;
1332         int err = 0;
1333
1334         if (start >= MAX_BLKADDR(sbi) || range->len < sbi->blocksize)
1335                 return -EINVAL;
1336
1337         cpc.trimmed = 0;
1338         if (end <= MAIN_BLKADDR(sbi))
1339                 goto out;
1340
1341         if (is_sbi_flag_set(sbi, SBI_NEED_FSCK)) {
1342                 f2fs_msg(sbi->sb, KERN_WARNING,
1343                         "Found FS corruption, run fsck to fix.");
1344                 goto out;
1345         }
1346
1347         /* start/end segment number in main_area */
1348         start_segno = (start <= MAIN_BLKADDR(sbi)) ? 0 : GET_SEGNO(sbi, start);
1349         end_segno = (end >= MAX_BLKADDR(sbi)) ? MAIN_SEGS(sbi) - 1 :
1350                                                 GET_SEGNO(sbi, end);
1351         cpc.reason = CP_DISCARD;
1352         cpc.trim_minlen = max_t(__u64, 1, F2FS_BYTES_TO_BLK(range->minlen));
1353
1354         /* do checkpoint to issue discard commands safely */
1355         for (; start_segno <= end_segno; start_segno = cpc.trim_end + 1) {
1356                 cpc.trim_start = start_segno;
1357
1358                 if (sbi->discard_blks == 0)
1359                         break;
1360                 else if (sbi->discard_blks < BATCHED_TRIM_BLOCKS(sbi))
1361                         cpc.trim_end = end_segno;
1362                 else
1363                         cpc.trim_end = min_t(unsigned int,
1364                                 rounddown(start_segno +
1365                                 BATCHED_TRIM_SEGMENTS(sbi),
1366                                 sbi->segs_per_sec) - 1, end_segno);
1367
1368                 mutex_lock(&sbi->gc_mutex);
1369                 err = write_checkpoint(sbi, &cpc);
1370                 mutex_unlock(&sbi->gc_mutex);
1371                 if (err)
1372                         break;
1373
1374                 schedule();
1375         }
1376 out:
1377         range->len = F2FS_BLK_TO_BYTES(cpc.trimmed);
1378         return err;
1379 }
1380
1381 static bool __has_curseg_space(struct f2fs_sb_info *sbi, int type)
1382 {
1383         struct curseg_info *curseg = CURSEG_I(sbi, type);
1384         if (curseg->next_blkoff < sbi->blocks_per_seg)
1385                 return true;
1386         return false;
1387 }
1388
1389 static int __get_segment_type_2(struct page *page, enum page_type p_type)
1390 {
1391         if (p_type == DATA)
1392                 return CURSEG_HOT_DATA;
1393         else
1394                 return CURSEG_HOT_NODE;
1395 }
1396
1397 static int __get_segment_type_4(struct page *page, enum page_type p_type)
1398 {
1399         if (p_type == DATA) {
1400                 struct inode *inode = page->mapping->host;
1401
1402                 if (S_ISDIR(inode->i_mode))
1403                         return CURSEG_HOT_DATA;
1404                 else
1405                         return CURSEG_COLD_DATA;
1406         } else {
1407                 if (IS_DNODE(page) && is_cold_node(page))
1408                         return CURSEG_WARM_NODE;
1409                 else
1410                         return CURSEG_COLD_NODE;
1411         }
1412 }
1413
1414 static int __get_segment_type_6(struct page *page, enum page_type p_type)
1415 {
1416         if (p_type == DATA) {
1417                 struct inode *inode = page->mapping->host;
1418
1419                 if (S_ISDIR(inode->i_mode))
1420                         return CURSEG_HOT_DATA;
1421                 else if (is_cold_data(page) || file_is_cold(inode))
1422                         return CURSEG_COLD_DATA;
1423                 else
1424                         return CURSEG_WARM_DATA;
1425         } else {
1426                 if (IS_DNODE(page))
1427                         return is_cold_node(page) ? CURSEG_WARM_NODE :
1428                                                 CURSEG_HOT_NODE;
1429                 else
1430                         return CURSEG_COLD_NODE;
1431         }
1432 }
1433
1434 static int __get_segment_type(struct page *page, enum page_type p_type)
1435 {
1436         switch (F2FS_P_SB(page)->active_logs) {
1437         case 2:
1438                 return __get_segment_type_2(page, p_type);
1439         case 4:
1440                 return __get_segment_type_4(page, p_type);
1441         }
1442         /* NR_CURSEG_TYPE(6) logs by default */
1443         f2fs_bug_on(F2FS_P_SB(page),
1444                 F2FS_P_SB(page)->active_logs != NR_CURSEG_TYPE);
1445         return __get_segment_type_6(page, p_type);
1446 }
1447
1448 void allocate_data_block(struct f2fs_sb_info *sbi, struct page *page,
1449                 block_t old_blkaddr, block_t *new_blkaddr,
1450                 struct f2fs_summary *sum, int type)
1451 {
1452         struct sit_info *sit_i = SIT_I(sbi);
1453         struct curseg_info *curseg;
1454         bool direct_io = (type == CURSEG_DIRECT_IO);
1455
1456         type = direct_io ? CURSEG_WARM_DATA : type;
1457
1458         curseg = CURSEG_I(sbi, type);
1459
1460         mutex_lock(&curseg->curseg_mutex);
1461         mutex_lock(&sit_i->sentry_lock);
1462
1463         /* direct_io'ed data is aligned to the segment for better performance */
1464         if (direct_io && curseg->next_blkoff &&
1465                                 !has_not_enough_free_secs(sbi, 0, 0))
1466                 __allocate_new_segments(sbi, type);
1467
1468         *new_blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
1469
1470         /*
1471          * __add_sum_entry should be resided under the curseg_mutex
1472          * because, this function updates a summary entry in the
1473          * current summary block.
1474          */
1475         __add_sum_entry(sbi, type, sum);
1476
1477         __refresh_next_blkoff(sbi, curseg);
1478
1479         stat_inc_block_count(sbi, curseg);
1480
1481         if (!__has_curseg_space(sbi, type))
1482                 sit_i->s_ops->allocate_segment(sbi, type, false);
1483         /*
1484          * SIT information should be updated before segment allocation,
1485          * since SSR needs latest valid block information.
1486          */
1487         refresh_sit_entry(sbi, old_blkaddr, *new_blkaddr);
1488
1489         mutex_unlock(&sit_i->sentry_lock);
1490
1491         if (page && IS_NODESEG(type))
1492                 fill_node_footer_blkaddr(page, NEXT_FREE_BLKADDR(sbi, curseg));
1493
1494         mutex_unlock(&curseg->curseg_mutex);
1495 }
1496
1497 static void do_write_page(struct f2fs_summary *sum, struct f2fs_io_info *fio)
1498 {
1499         int type = __get_segment_type(fio->page, fio->type);
1500
1501         if (fio->type == NODE || fio->type == DATA)
1502                 mutex_lock(&fio->sbi->wio_mutex[fio->type]);
1503
1504         allocate_data_block(fio->sbi, fio->page, fio->old_blkaddr,
1505                                         &fio->new_blkaddr, sum, type);
1506
1507         /* writeout dirty page into bdev */
1508         f2fs_submit_page_mbio(fio);
1509
1510         if (fio->type == NODE || fio->type == DATA)
1511                 mutex_unlock(&fio->sbi->wio_mutex[fio->type]);
1512 }
1513
1514 void write_meta_page(struct f2fs_sb_info *sbi, struct page *page)
1515 {
1516         struct f2fs_io_info fio = {
1517                 .sbi = sbi,
1518                 .type = META,
1519                 .op = REQ_OP_WRITE,
1520                 .op_flags = WRITE_SYNC | REQ_META | REQ_PRIO,
1521                 .old_blkaddr = page->index,
1522                 .new_blkaddr = page->index,
1523                 .page = page,
1524                 .encrypted_page = NULL,
1525         };
1526
1527         if (unlikely(page->index >= MAIN_BLKADDR(sbi)))
1528                 fio.op_flags &= ~REQ_META;
1529
1530         set_page_writeback(page);
1531         f2fs_submit_page_mbio(&fio);
1532 }
1533
1534 void write_node_page(unsigned int nid, struct f2fs_io_info *fio)
1535 {
1536         struct f2fs_summary sum;
1537
1538         set_summary(&sum, nid, 0, 0);
1539         do_write_page(&sum, fio);
1540 }
1541
1542 void write_data_page(struct dnode_of_data *dn, struct f2fs_io_info *fio)
1543 {
1544         struct f2fs_sb_info *sbi = fio->sbi;
1545         struct f2fs_summary sum;
1546         struct node_info ni;
1547
1548         f2fs_bug_on(sbi, dn->data_blkaddr == NULL_ADDR);
1549         get_node_info(sbi, dn->nid, &ni);
1550         set_summary(&sum, dn->nid, dn->ofs_in_node, ni.version);
1551         do_write_page(&sum, fio);
1552         f2fs_update_data_blkaddr(dn, fio->new_blkaddr);
1553 }
1554
1555 void rewrite_data_page(struct f2fs_io_info *fio)
1556 {
1557         fio->new_blkaddr = fio->old_blkaddr;
1558         stat_inc_inplace_blocks(fio->sbi);
1559         f2fs_submit_page_mbio(fio);
1560 }
1561
1562 void __f2fs_replace_block(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
1563                                 block_t old_blkaddr, block_t new_blkaddr,
1564                                 bool recover_curseg, bool recover_newaddr)
1565 {
1566         struct sit_info *sit_i = SIT_I(sbi);
1567         struct curseg_info *curseg;
1568         unsigned int segno, old_cursegno;
1569         struct seg_entry *se;
1570         int type;
1571         unsigned short old_blkoff;
1572
1573         segno = GET_SEGNO(sbi, new_blkaddr);
1574         se = get_seg_entry(sbi, segno);
1575         type = se->type;
1576
1577         if (!recover_curseg) {
1578                 /* for recovery flow */
1579                 if (se->valid_blocks == 0 && !IS_CURSEG(sbi, segno)) {
1580                         if (old_blkaddr == NULL_ADDR)
1581                                 type = CURSEG_COLD_DATA;
1582                         else
1583                                 type = CURSEG_WARM_DATA;
1584                 }
1585         } else {
1586                 if (!IS_CURSEG(sbi, segno))
1587                         type = CURSEG_WARM_DATA;
1588         }
1589
1590         curseg = CURSEG_I(sbi, type);
1591
1592         mutex_lock(&curseg->curseg_mutex);
1593         mutex_lock(&sit_i->sentry_lock);
1594
1595         old_cursegno = curseg->segno;
1596         old_blkoff = curseg->next_blkoff;
1597
1598         /* change the current segment */
1599         if (segno != curseg->segno) {
1600                 curseg->next_segno = segno;
1601                 change_curseg(sbi, type, true);
1602         }
1603
1604         curseg->next_blkoff = GET_BLKOFF_FROM_SEG0(sbi, new_blkaddr);
1605         __add_sum_entry(sbi, type, sum);
1606
1607         if (!recover_curseg || recover_newaddr)
1608                 update_sit_entry(sbi, new_blkaddr, 1);
1609         if (GET_SEGNO(sbi, old_blkaddr) != NULL_SEGNO)
1610                 update_sit_entry(sbi, old_blkaddr, -1);
1611
1612         locate_dirty_segment(sbi, GET_SEGNO(sbi, old_blkaddr));
1613         locate_dirty_segment(sbi, GET_SEGNO(sbi, new_blkaddr));
1614
1615         locate_dirty_segment(sbi, old_cursegno);
1616
1617         if (recover_curseg) {
1618                 if (old_cursegno != curseg->segno) {
1619                         curseg->next_segno = old_cursegno;
1620                         change_curseg(sbi, type, true);
1621                 }
1622                 curseg->next_blkoff = old_blkoff;
1623         }
1624
1625         mutex_unlock(&sit_i->sentry_lock);
1626         mutex_unlock(&curseg->curseg_mutex);
1627 }
1628
1629 void f2fs_replace_block(struct f2fs_sb_info *sbi, struct dnode_of_data *dn,
1630                                 block_t old_addr, block_t new_addr,
1631                                 unsigned char version, bool recover_curseg,
1632                                 bool recover_newaddr)
1633 {
1634         struct f2fs_summary sum;
1635
1636         set_summary(&sum, dn->nid, dn->ofs_in_node, version);
1637
1638         __f2fs_replace_block(sbi, &sum, old_addr, new_addr,
1639                                         recover_curseg, recover_newaddr);
1640
1641         f2fs_update_data_blkaddr(dn, new_addr);
1642 }
1643
1644 void f2fs_wait_on_page_writeback(struct page *page,
1645                                 enum page_type type, bool ordered)
1646 {
1647         if (PageWriteback(page)) {
1648                 struct f2fs_sb_info *sbi = F2FS_P_SB(page);
1649
1650                 f2fs_submit_merged_bio_cond(sbi, NULL, page, 0, type, WRITE);
1651                 if (ordered)
1652                         wait_on_page_writeback(page);
1653                 else
1654                         wait_for_stable_page(page);
1655         }
1656 }
1657
1658 void f2fs_wait_on_encrypted_page_writeback(struct f2fs_sb_info *sbi,
1659                                                         block_t blkaddr)
1660 {
1661         struct page *cpage;
1662
1663         if (blkaddr == NEW_ADDR || blkaddr == NULL_ADDR)
1664                 return;
1665
1666         cpage = find_lock_page(META_MAPPING(sbi), blkaddr);
1667         if (cpage) {
1668                 f2fs_wait_on_page_writeback(cpage, DATA, true);
1669                 f2fs_put_page(cpage, 1);
1670         }
1671 }
1672
1673 static int read_compacted_summaries(struct f2fs_sb_info *sbi)
1674 {
1675         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1676         struct curseg_info *seg_i;
1677         unsigned char *kaddr;
1678         struct page *page;
1679         block_t start;
1680         int i, j, offset;
1681
1682         start = start_sum_block(sbi);
1683
1684         page = get_meta_page(sbi, start++);
1685         kaddr = (unsigned char *)page_address(page);
1686
1687         /* Step 1: restore nat cache */
1688         seg_i = CURSEG_I(sbi, CURSEG_HOT_DATA);
1689         memcpy(seg_i->journal, kaddr, SUM_JOURNAL_SIZE);
1690
1691         /* Step 2: restore sit cache */
1692         seg_i = CURSEG_I(sbi, CURSEG_COLD_DATA);
1693         memcpy(seg_i->journal, kaddr + SUM_JOURNAL_SIZE, SUM_JOURNAL_SIZE);
1694         offset = 2 * SUM_JOURNAL_SIZE;
1695
1696         /* Step 3: restore summary entries */
1697         for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++) {
1698                 unsigned short blk_off;
1699                 unsigned int segno;
1700
1701                 seg_i = CURSEG_I(sbi, i);
1702                 segno = le32_to_cpu(ckpt->cur_data_segno[i]);
1703                 blk_off = le16_to_cpu(ckpt->cur_data_blkoff[i]);
1704                 seg_i->next_segno = segno;
1705                 reset_curseg(sbi, i, 0);
1706                 seg_i->alloc_type = ckpt->alloc_type[i];
1707                 seg_i->next_blkoff = blk_off;
1708
1709                 if (seg_i->alloc_type == SSR)
1710                         blk_off = sbi->blocks_per_seg;
1711
1712                 for (j = 0; j < blk_off; j++) {
1713                         struct f2fs_summary *s;
1714                         s = (struct f2fs_summary *)(kaddr + offset);
1715                         seg_i->sum_blk->entries[j] = *s;
1716                         offset += SUMMARY_SIZE;
1717                         if (offset + SUMMARY_SIZE <= PAGE_SIZE -
1718                                                 SUM_FOOTER_SIZE)
1719                                 continue;
1720
1721                         f2fs_put_page(page, 1);
1722                         page = NULL;
1723
1724                         page = get_meta_page(sbi, start++);
1725                         kaddr = (unsigned char *)page_address(page);
1726                         offset = 0;
1727                 }
1728         }
1729         f2fs_put_page(page, 1);
1730         return 0;
1731 }
1732
1733 static int read_normal_summaries(struct f2fs_sb_info *sbi, int type)
1734 {
1735         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1736         struct f2fs_summary_block *sum;
1737         struct curseg_info *curseg;
1738         struct page *new;
1739         unsigned short blk_off;
1740         unsigned int segno = 0;
1741         block_t blk_addr = 0;
1742
1743         /* get segment number and block addr */
1744         if (IS_DATASEG(type)) {
1745                 segno = le32_to_cpu(ckpt->cur_data_segno[type]);
1746                 blk_off = le16_to_cpu(ckpt->cur_data_blkoff[type -
1747                                                         CURSEG_HOT_DATA]);
1748                 if (__exist_node_summaries(sbi))
1749                         blk_addr = sum_blk_addr(sbi, NR_CURSEG_TYPE, type);
1750                 else
1751                         blk_addr = sum_blk_addr(sbi, NR_CURSEG_DATA_TYPE, type);
1752         } else {
1753                 segno = le32_to_cpu(ckpt->cur_node_segno[type -
1754                                                         CURSEG_HOT_NODE]);
1755                 blk_off = le16_to_cpu(ckpt->cur_node_blkoff[type -
1756                                                         CURSEG_HOT_NODE]);
1757                 if (__exist_node_summaries(sbi))
1758                         blk_addr = sum_blk_addr(sbi, NR_CURSEG_NODE_TYPE,
1759                                                         type - CURSEG_HOT_NODE);
1760                 else
1761                         blk_addr = GET_SUM_BLOCK(sbi, segno);
1762         }
1763
1764         new = get_meta_page(sbi, blk_addr);
1765         sum = (struct f2fs_summary_block *)page_address(new);
1766
1767         if (IS_NODESEG(type)) {
1768                 if (__exist_node_summaries(sbi)) {
1769                         struct f2fs_summary *ns = &sum->entries[0];
1770                         int i;
1771                         for (i = 0; i < sbi->blocks_per_seg; i++, ns++) {
1772                                 ns->version = 0;
1773                                 ns->ofs_in_node = 0;
1774                         }
1775                 } else {
1776                         int err;
1777
1778                         err = restore_node_summary(sbi, segno, sum);
1779                         if (err) {
1780                                 f2fs_put_page(new, 1);
1781                                 return err;
1782                         }
1783                 }
1784         }
1785
1786         /* set uncompleted segment to curseg */
1787         curseg = CURSEG_I(sbi, type);
1788         mutex_lock(&curseg->curseg_mutex);
1789
1790         /* update journal info */
1791         down_write(&curseg->journal_rwsem);
1792         memcpy(curseg->journal, &sum->journal, SUM_JOURNAL_SIZE);
1793         up_write(&curseg->journal_rwsem);
1794
1795         memcpy(curseg->sum_blk->entries, sum->entries, SUM_ENTRY_SIZE);
1796         memcpy(&curseg->sum_blk->footer, &sum->footer, SUM_FOOTER_SIZE);
1797         curseg->next_segno = segno;
1798         reset_curseg(sbi, type, 0);
1799         curseg->alloc_type = ckpt->alloc_type[type];
1800         curseg->next_blkoff = blk_off;
1801         mutex_unlock(&curseg->curseg_mutex);
1802         f2fs_put_page(new, 1);
1803         return 0;
1804 }
1805
1806 static int restore_curseg_summaries(struct f2fs_sb_info *sbi)
1807 {
1808         struct f2fs_journal *sit_j = CURSEG_I(sbi, CURSEG_COLD_DATA)->journal;
1809         struct f2fs_journal *nat_j = CURSEG_I(sbi, CURSEG_HOT_DATA)->journal;
1810         int type = CURSEG_HOT_DATA;
1811         int err;
1812
1813         if (is_set_ckpt_flags(sbi, CP_COMPACT_SUM_FLAG)) {
1814                 int npages = npages_for_summary_flush(sbi, true);
1815
1816                 if (npages >= 2)
1817                         ra_meta_pages(sbi, start_sum_block(sbi), npages,
1818                                                         META_CP, true);
1819
1820                 /* restore for compacted data summary */
1821                 if (read_compacted_summaries(sbi))
1822                         return -EINVAL;
1823                 type = CURSEG_HOT_NODE;
1824         }
1825
1826         if (__exist_node_summaries(sbi))
1827                 ra_meta_pages(sbi, sum_blk_addr(sbi, NR_CURSEG_TYPE, type),
1828                                         NR_CURSEG_TYPE - type, META_CP, true);
1829
1830         for (; type <= CURSEG_COLD_NODE; type++) {
1831                 err = read_normal_summaries(sbi, type);
1832                 if (err)
1833                         return err;
1834         }
1835
1836         /* sanity check for summary blocks */
1837         if (nats_in_cursum(nat_j) > NAT_JOURNAL_ENTRIES ||
1838                         sits_in_cursum(sit_j) > SIT_JOURNAL_ENTRIES)
1839                 return -EINVAL;
1840
1841         return 0;
1842 }
1843
1844 static void write_compacted_summaries(struct f2fs_sb_info *sbi, block_t blkaddr)
1845 {
1846         struct page *page;
1847         unsigned char *kaddr;
1848         struct f2fs_summary *summary;
1849         struct curseg_info *seg_i;
1850         int written_size = 0;
1851         int i, j;
1852
1853         page = grab_meta_page(sbi, blkaddr++);
1854         kaddr = (unsigned char *)page_address(page);
1855
1856         /* Step 1: write nat cache */
1857         seg_i = CURSEG_I(sbi, CURSEG_HOT_DATA);
1858         memcpy(kaddr, seg_i->journal, SUM_JOURNAL_SIZE);
1859         written_size += SUM_JOURNAL_SIZE;
1860
1861         /* Step 2: write sit cache */
1862         seg_i = CURSEG_I(sbi, CURSEG_COLD_DATA);
1863         memcpy(kaddr + written_size, seg_i->journal, SUM_JOURNAL_SIZE);
1864         written_size += SUM_JOURNAL_SIZE;
1865
1866         /* Step 3: write summary entries */
1867         for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++) {
1868                 unsigned short blkoff;
1869                 seg_i = CURSEG_I(sbi, i);
1870                 if (sbi->ckpt->alloc_type[i] == SSR)
1871                         blkoff = sbi->blocks_per_seg;
1872                 else
1873                         blkoff = curseg_blkoff(sbi, i);
1874
1875                 for (j = 0; j < blkoff; j++) {
1876                         if (!page) {
1877                                 page = grab_meta_page(sbi, blkaddr++);
1878                                 kaddr = (unsigned char *)page_address(page);
1879                                 written_size = 0;
1880                         }
1881                         summary = (struct f2fs_summary *)(kaddr + written_size);
1882                         *summary = seg_i->sum_blk->entries[j];
1883                         written_size += SUMMARY_SIZE;
1884
1885                         if (written_size + SUMMARY_SIZE <= PAGE_SIZE -
1886                                                         SUM_FOOTER_SIZE)
1887                                 continue;
1888
1889                         set_page_dirty(page);
1890                         f2fs_put_page(page, 1);
1891                         page = NULL;
1892                 }
1893         }
1894         if (page) {
1895                 set_page_dirty(page);
1896                 f2fs_put_page(page, 1);
1897         }
1898 }
1899
1900 static void write_normal_summaries(struct f2fs_sb_info *sbi,
1901                                         block_t blkaddr, int type)
1902 {
1903         int i, end;
1904         if (IS_DATASEG(type))
1905                 end = type + NR_CURSEG_DATA_TYPE;
1906         else
1907                 end = type + NR_CURSEG_NODE_TYPE;
1908
1909         for (i = type; i < end; i++)
1910                 write_current_sum_page(sbi, i, blkaddr + (i - type));
1911 }
1912
1913 void write_data_summaries(struct f2fs_sb_info *sbi, block_t start_blk)
1914 {
1915         if (is_set_ckpt_flags(sbi, CP_COMPACT_SUM_FLAG))
1916                 write_compacted_summaries(sbi, start_blk);
1917         else
1918                 write_normal_summaries(sbi, start_blk, CURSEG_HOT_DATA);
1919 }
1920
1921 void write_node_summaries(struct f2fs_sb_info *sbi, block_t start_blk)
1922 {
1923         write_normal_summaries(sbi, start_blk, CURSEG_HOT_NODE);
1924 }
1925
1926 int lookup_journal_in_cursum(struct f2fs_journal *journal, int type,
1927                                         unsigned int val, int alloc)
1928 {
1929         int i;
1930
1931         if (type == NAT_JOURNAL) {
1932                 for (i = 0; i < nats_in_cursum(journal); i++) {
1933                         if (le32_to_cpu(nid_in_journal(journal, i)) == val)
1934                                 return i;
1935                 }
1936                 if (alloc && __has_cursum_space(journal, 1, NAT_JOURNAL))
1937                         return update_nats_in_cursum(journal, 1);
1938         } else if (type == SIT_JOURNAL) {
1939                 for (i = 0; i < sits_in_cursum(journal); i++)
1940                         if (le32_to_cpu(segno_in_journal(journal, i)) == val)
1941                                 return i;
1942                 if (alloc && __has_cursum_space(journal, 1, SIT_JOURNAL))
1943                         return update_sits_in_cursum(journal, 1);
1944         }
1945         return -1;
1946 }
1947
1948 static struct page *get_current_sit_page(struct f2fs_sb_info *sbi,
1949                                         unsigned int segno)
1950 {
1951         return get_meta_page(sbi, current_sit_addr(sbi, segno));
1952 }
1953
1954 static struct page *get_next_sit_page(struct f2fs_sb_info *sbi,
1955                                         unsigned int start)
1956 {
1957         struct sit_info *sit_i = SIT_I(sbi);
1958         struct page *src_page, *dst_page;
1959         pgoff_t src_off, dst_off;
1960         void *src_addr, *dst_addr;
1961
1962         src_off = current_sit_addr(sbi, start);
1963         dst_off = next_sit_addr(sbi, src_off);
1964
1965         /* get current sit block page without lock */
1966         src_page = get_meta_page(sbi, src_off);
1967         dst_page = grab_meta_page(sbi, dst_off);
1968         f2fs_bug_on(sbi, PageDirty(src_page));
1969
1970         src_addr = page_address(src_page);
1971         dst_addr = page_address(dst_page);
1972         memcpy(dst_addr, src_addr, PAGE_SIZE);
1973
1974         set_page_dirty(dst_page);
1975         f2fs_put_page(src_page, 1);
1976
1977         set_to_next_sit(sit_i, start);
1978
1979         return dst_page;
1980 }
1981
1982 static struct sit_entry_set *grab_sit_entry_set(void)
1983 {
1984         struct sit_entry_set *ses =
1985                         f2fs_kmem_cache_alloc(sit_entry_set_slab, GFP_NOFS);
1986
1987         ses->entry_cnt = 0;
1988         INIT_LIST_HEAD(&ses->set_list);
1989         return ses;
1990 }
1991
1992 static void release_sit_entry_set(struct sit_entry_set *ses)
1993 {
1994         list_del(&ses->set_list);
1995         kmem_cache_free(sit_entry_set_slab, ses);
1996 }
1997
1998 static void adjust_sit_entry_set(struct sit_entry_set *ses,
1999                                                 struct list_head *head)
2000 {
2001         struct sit_entry_set *next = ses;
2002
2003         if (list_is_last(&ses->set_list, head))
2004                 return;
2005
2006         list_for_each_entry_continue(next, head, set_list)
2007                 if (ses->entry_cnt <= next->entry_cnt)
2008                         break;
2009
2010         list_move_tail(&ses->set_list, &next->set_list);
2011 }
2012
2013 static void add_sit_entry(unsigned int segno, struct list_head *head)
2014 {
2015         struct sit_entry_set *ses;
2016         unsigned int start_segno = START_SEGNO(segno);
2017
2018         list_for_each_entry(ses, head, set_list) {
2019                 if (ses->start_segno == start_segno) {
2020                         ses->entry_cnt++;
2021                         adjust_sit_entry_set(ses, head);
2022                         return;
2023                 }
2024         }
2025
2026         ses = grab_sit_entry_set();
2027
2028         ses->start_segno = start_segno;
2029         ses->entry_cnt++;
2030         list_add(&ses->set_list, head);
2031 }
2032
2033 static void add_sits_in_set(struct f2fs_sb_info *sbi)
2034 {
2035         struct f2fs_sm_info *sm_info = SM_I(sbi);
2036         struct list_head *set_list = &sm_info->sit_entry_set;
2037         unsigned long *bitmap = SIT_I(sbi)->dirty_sentries_bitmap;
2038         unsigned int segno;
2039
2040         for_each_set_bit(segno, bitmap, MAIN_SEGS(sbi))
2041                 add_sit_entry(segno, set_list);
2042 }
2043
2044 static void remove_sits_in_journal(struct f2fs_sb_info *sbi)
2045 {
2046         struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_COLD_DATA);
2047         struct f2fs_journal *journal = curseg->journal;
2048         int i;
2049
2050         down_write(&curseg->journal_rwsem);
2051         for (i = 0; i < sits_in_cursum(journal); i++) {
2052                 unsigned int segno;
2053                 bool dirtied;
2054
2055                 segno = le32_to_cpu(segno_in_journal(journal, i));
2056                 dirtied = __mark_sit_entry_dirty(sbi, segno);
2057
2058                 if (!dirtied)
2059                         add_sit_entry(segno, &SM_I(sbi)->sit_entry_set);
2060         }
2061         update_sits_in_cursum(journal, -i);
2062         up_write(&curseg->journal_rwsem);
2063 }
2064
2065 /*
2066  * CP calls this function, which flushes SIT entries including sit_journal,
2067  * and moves prefree segs to free segs.
2068  */
2069 void flush_sit_entries(struct f2fs_sb_info *sbi, struct cp_control *cpc)
2070 {
2071         struct sit_info *sit_i = SIT_I(sbi);
2072         unsigned long *bitmap = sit_i->dirty_sentries_bitmap;
2073         struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_COLD_DATA);
2074         struct f2fs_journal *journal = curseg->journal;
2075         struct sit_entry_set *ses, *tmp;
2076         struct list_head *head = &SM_I(sbi)->sit_entry_set;
2077         bool to_journal = true;
2078         struct seg_entry *se;
2079
2080         mutex_lock(&sit_i->sentry_lock);
2081
2082         if (!sit_i->dirty_sentries)
2083                 goto out;
2084
2085         /*
2086          * add and account sit entries of dirty bitmap in sit entry
2087          * set temporarily
2088          */
2089         add_sits_in_set(sbi);
2090
2091         /*
2092          * if there are no enough space in journal to store dirty sit
2093          * entries, remove all entries from journal and add and account
2094          * them in sit entry set.
2095          */
2096         if (!__has_cursum_space(journal, sit_i->dirty_sentries, SIT_JOURNAL))
2097                 remove_sits_in_journal(sbi);
2098
2099         /*
2100          * there are two steps to flush sit entries:
2101          * #1, flush sit entries to journal in current cold data summary block.
2102          * #2, flush sit entries to sit page.
2103          */
2104         list_for_each_entry_safe(ses, tmp, head, set_list) {
2105                 struct page *page = NULL;
2106                 struct f2fs_sit_block *raw_sit = NULL;
2107                 unsigned int start_segno = ses->start_segno;
2108                 unsigned int end = min(start_segno + SIT_ENTRY_PER_BLOCK,
2109                                                 (unsigned long)MAIN_SEGS(sbi));
2110                 unsigned int segno = start_segno;
2111
2112                 if (to_journal &&
2113                         !__has_cursum_space(journal, ses->entry_cnt, SIT_JOURNAL))
2114                         to_journal = false;
2115
2116                 if (to_journal) {
2117                         down_write(&curseg->journal_rwsem);
2118                 } else {
2119                         page = get_next_sit_page(sbi, start_segno);
2120                         raw_sit = page_address(page);
2121                 }
2122
2123                 /* flush dirty sit entries in region of current sit set */
2124                 for_each_set_bit_from(segno, bitmap, end) {
2125                         int offset, sit_offset;
2126
2127                         se = get_seg_entry(sbi, segno);
2128
2129                         /* add discard candidates */
2130                         if (cpc->reason != CP_DISCARD) {
2131                                 cpc->trim_start = segno;
2132                                 add_discard_addrs(sbi, cpc);
2133                         }
2134
2135                         if (to_journal) {
2136                                 offset = lookup_journal_in_cursum(journal,
2137                                                         SIT_JOURNAL, segno, 1);
2138                                 f2fs_bug_on(sbi, offset < 0);
2139                                 segno_in_journal(journal, offset) =
2140                                                         cpu_to_le32(segno);
2141                                 seg_info_to_raw_sit(se,
2142                                         &sit_in_journal(journal, offset));
2143                         } else {
2144                                 sit_offset = SIT_ENTRY_OFFSET(sit_i, segno);
2145                                 seg_info_to_raw_sit(se,
2146                                                 &raw_sit->entries[sit_offset]);
2147                         }
2148
2149                         __clear_bit(segno, bitmap);
2150                         sit_i->dirty_sentries--;
2151                         ses->entry_cnt--;
2152                 }
2153
2154                 if (to_journal)
2155                         up_write(&curseg->journal_rwsem);
2156                 else
2157                         f2fs_put_page(page, 1);
2158
2159                 f2fs_bug_on(sbi, ses->entry_cnt);
2160                 release_sit_entry_set(ses);
2161         }
2162
2163         f2fs_bug_on(sbi, !list_empty(head));
2164         f2fs_bug_on(sbi, sit_i->dirty_sentries);
2165 out:
2166         if (cpc->reason == CP_DISCARD) {
2167                 for (; cpc->trim_start <= cpc->trim_end; cpc->trim_start++)
2168                         add_discard_addrs(sbi, cpc);
2169         }
2170         mutex_unlock(&sit_i->sentry_lock);
2171
2172         set_prefree_as_free_segments(sbi);
2173 }
2174
2175 static int build_sit_info(struct f2fs_sb_info *sbi)
2176 {
2177         struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
2178         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
2179         struct sit_info *sit_i;
2180         unsigned int sit_segs, start;
2181         char *src_bitmap, *dst_bitmap;
2182         unsigned int bitmap_size;
2183
2184         /* allocate memory for SIT information */
2185         sit_i = kzalloc(sizeof(struct sit_info), GFP_KERNEL);
2186         if (!sit_i)
2187                 return -ENOMEM;
2188
2189         SM_I(sbi)->sit_info = sit_i;
2190
2191         sit_i->sentries = f2fs_kvzalloc(MAIN_SEGS(sbi) *
2192                                         sizeof(struct seg_entry), GFP_KERNEL);
2193         if (!sit_i->sentries)
2194                 return -ENOMEM;
2195
2196         bitmap_size = f2fs_bitmap_size(MAIN_SEGS(sbi));
2197         sit_i->dirty_sentries_bitmap = f2fs_kvzalloc(bitmap_size, GFP_KERNEL);
2198         if (!sit_i->dirty_sentries_bitmap)
2199                 return -ENOMEM;
2200
2201         for (start = 0; start < MAIN_SEGS(sbi); start++) {
2202                 sit_i->sentries[start].cur_valid_map
2203                         = kzalloc(SIT_VBLOCK_MAP_SIZE, GFP_KERNEL);
2204                 sit_i->sentries[start].ckpt_valid_map
2205                         = kzalloc(SIT_VBLOCK_MAP_SIZE, GFP_KERNEL);
2206                 if (!sit_i->sentries[start].cur_valid_map ||
2207                                 !sit_i->sentries[start].ckpt_valid_map)
2208                         return -ENOMEM;
2209
2210                 if (f2fs_discard_en(sbi)) {
2211                         sit_i->sentries[start].discard_map
2212                                 = kzalloc(SIT_VBLOCK_MAP_SIZE, GFP_KERNEL);
2213                         if (!sit_i->sentries[start].discard_map)
2214                                 return -ENOMEM;
2215                 }
2216         }
2217
2218         sit_i->tmp_map = kzalloc(SIT_VBLOCK_MAP_SIZE, GFP_KERNEL);
2219         if (!sit_i->tmp_map)
2220                 return -ENOMEM;
2221
2222         if (sbi->segs_per_sec > 1) {
2223                 sit_i->sec_entries = f2fs_kvzalloc(MAIN_SECS(sbi) *
2224                                         sizeof(struct sec_entry), GFP_KERNEL);
2225                 if (!sit_i->sec_entries)
2226                         return -ENOMEM;
2227         }
2228
2229         /* get information related with SIT */
2230         sit_segs = le32_to_cpu(raw_super->segment_count_sit) >> 1;
2231
2232         /* setup SIT bitmap from ckeckpoint pack */
2233         bitmap_size = __bitmap_size(sbi, SIT_BITMAP);
2234         src_bitmap = __bitmap_ptr(sbi, SIT_BITMAP);
2235
2236         dst_bitmap = kmemdup(src_bitmap, bitmap_size, GFP_KERNEL);
2237         if (!dst_bitmap)
2238                 return -ENOMEM;
2239
2240         /* init SIT information */
2241         sit_i->s_ops = &default_salloc_ops;
2242
2243         sit_i->sit_base_addr = le32_to_cpu(raw_super->sit_blkaddr);
2244         sit_i->sit_blocks = sit_segs << sbi->log_blocks_per_seg;
2245         sit_i->written_valid_blocks = le64_to_cpu(ckpt->valid_block_count);
2246         sit_i->sit_bitmap = dst_bitmap;
2247         sit_i->bitmap_size = bitmap_size;
2248         sit_i->dirty_sentries = 0;
2249         sit_i->sents_per_block = SIT_ENTRY_PER_BLOCK;
2250         sit_i->elapsed_time = le64_to_cpu(sbi->ckpt->elapsed_time);
2251         sit_i->mounted_time = CURRENT_TIME_SEC.tv_sec;
2252         mutex_init(&sit_i->sentry_lock);
2253         return 0;
2254 }
2255
2256 static int build_free_segmap(struct f2fs_sb_info *sbi)
2257 {
2258         struct free_segmap_info *free_i;
2259         unsigned int bitmap_size, sec_bitmap_size;
2260
2261         /* allocate memory for free segmap information */
2262         free_i = kzalloc(sizeof(struct free_segmap_info), GFP_KERNEL);
2263         if (!free_i)
2264                 return -ENOMEM;
2265
2266         SM_I(sbi)->free_info = free_i;
2267
2268         bitmap_size = f2fs_bitmap_size(MAIN_SEGS(sbi));
2269         free_i->free_segmap = f2fs_kvmalloc(bitmap_size, GFP_KERNEL);
2270         if (!free_i->free_segmap)
2271                 return -ENOMEM;
2272
2273         sec_bitmap_size = f2fs_bitmap_size(MAIN_SECS(sbi));
2274         free_i->free_secmap = f2fs_kvmalloc(sec_bitmap_size, GFP_KERNEL);
2275         if (!free_i->free_secmap)
2276                 return -ENOMEM;
2277
2278         /* set all segments as dirty temporarily */
2279         memset(free_i->free_segmap, 0xff, bitmap_size);
2280         memset(free_i->free_secmap, 0xff, sec_bitmap_size);
2281
2282         /* init free segmap information */
2283         free_i->start_segno = GET_SEGNO_FROM_SEG0(sbi, MAIN_BLKADDR(sbi));
2284         free_i->free_segments = 0;
2285         free_i->free_sections = 0;
2286         spin_lock_init(&free_i->segmap_lock);
2287         return 0;
2288 }
2289
2290 static int build_curseg(struct f2fs_sb_info *sbi)
2291 {
2292         struct curseg_info *array;
2293         int i;
2294
2295         array = kcalloc(NR_CURSEG_TYPE, sizeof(*array), GFP_KERNEL);
2296         if (!array)
2297                 return -ENOMEM;
2298
2299         SM_I(sbi)->curseg_array = array;
2300
2301         for (i = 0; i < NR_CURSEG_TYPE; i++) {
2302                 mutex_init(&array[i].curseg_mutex);
2303                 array[i].sum_blk = kzalloc(PAGE_SIZE, GFP_KERNEL);
2304                 if (!array[i].sum_blk)
2305                         return -ENOMEM;
2306                 init_rwsem(&array[i].journal_rwsem);
2307                 array[i].journal = kzalloc(sizeof(struct f2fs_journal),
2308                                                         GFP_KERNEL);
2309                 if (!array[i].journal)
2310                         return -ENOMEM;
2311                 array[i].segno = NULL_SEGNO;
2312                 array[i].next_blkoff = 0;
2313         }
2314         return restore_curseg_summaries(sbi);
2315 }
2316
2317 static void build_sit_entries(struct f2fs_sb_info *sbi)
2318 {
2319         struct sit_info *sit_i = SIT_I(sbi);
2320         struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_COLD_DATA);
2321         struct f2fs_journal *journal = curseg->journal;
2322         struct seg_entry *se;
2323         struct f2fs_sit_entry sit;
2324         int sit_blk_cnt = SIT_BLK_CNT(sbi);
2325         unsigned int i, start, end;
2326         unsigned int readed, start_blk = 0;
2327         int nrpages = MAX_BIO_BLOCKS(sbi) * 8;
2328
2329         do {
2330                 readed = ra_meta_pages(sbi, start_blk, nrpages, META_SIT, true);
2331
2332                 start = start_blk * sit_i->sents_per_block;
2333                 end = (start_blk + readed) * sit_i->sents_per_block;
2334
2335                 for (; start < end && start < MAIN_SEGS(sbi); start++) {
2336                         struct f2fs_sit_block *sit_blk;
2337                         struct page *page;
2338
2339                         se = &sit_i->sentries[start];
2340                         page = get_current_sit_page(sbi, start);
2341                         sit_blk = (struct f2fs_sit_block *)page_address(page);
2342                         sit = sit_blk->entries[SIT_ENTRY_OFFSET(sit_i, start)];
2343                         f2fs_put_page(page, 1);
2344
2345                         check_block_count(sbi, start, &sit);
2346                         seg_info_from_raw_sit(se, &sit);
2347
2348                         /* build discard map only one time */
2349                         if (f2fs_discard_en(sbi)) {
2350                                 memcpy(se->discard_map, se->cur_valid_map,
2351                                                         SIT_VBLOCK_MAP_SIZE);
2352                                 sbi->discard_blks += sbi->blocks_per_seg -
2353                                                         se->valid_blocks;
2354                         }
2355
2356                         if (sbi->segs_per_sec > 1)
2357                                 get_sec_entry(sbi, start)->valid_blocks +=
2358                                                         se->valid_blocks;
2359                 }
2360                 start_blk += readed;
2361         } while (start_blk < sit_blk_cnt);
2362
2363         down_read(&curseg->journal_rwsem);
2364         for (i = 0; i < sits_in_cursum(journal); i++) {
2365                 unsigned int old_valid_blocks;
2366
2367                 start = le32_to_cpu(segno_in_journal(journal, i));
2368                 se = &sit_i->sentries[start];
2369                 sit = sit_in_journal(journal, i);
2370
2371                 old_valid_blocks = se->valid_blocks;
2372
2373                 check_block_count(sbi, start, &sit);
2374                 seg_info_from_raw_sit(se, &sit);
2375
2376                 if (f2fs_discard_en(sbi)) {
2377                         memcpy(se->discard_map, se->cur_valid_map,
2378                                                 SIT_VBLOCK_MAP_SIZE);
2379                         sbi->discard_blks += old_valid_blocks -
2380                                                 se->valid_blocks;
2381                 }
2382
2383                 if (sbi->segs_per_sec > 1)
2384                         get_sec_entry(sbi, start)->valid_blocks +=
2385                                 se->valid_blocks - old_valid_blocks;
2386         }
2387         up_read(&curseg->journal_rwsem);
2388 }
2389
2390 static void init_free_segmap(struct f2fs_sb_info *sbi)
2391 {
2392         unsigned int start;
2393         int type;
2394
2395         for (start = 0; start < MAIN_SEGS(sbi); start++) {
2396                 struct seg_entry *sentry = get_seg_entry(sbi, start);
2397                 if (!sentry->valid_blocks)
2398                         __set_free(sbi, start);
2399         }
2400
2401         /* set use the current segments */
2402         for (type = CURSEG_HOT_DATA; type <= CURSEG_COLD_NODE; type++) {
2403                 struct curseg_info *curseg_t = CURSEG_I(sbi, type);
2404                 __set_test_and_inuse(sbi, curseg_t->segno);
2405         }
2406 }
2407
2408 static void init_dirty_segmap(struct f2fs_sb_info *sbi)
2409 {
2410         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
2411         struct free_segmap_info *free_i = FREE_I(sbi);
2412         unsigned int segno = 0, offset = 0;
2413         unsigned short valid_blocks;
2414
2415         while (1) {
2416                 /* find dirty segment based on free segmap */
2417                 segno = find_next_inuse(free_i, MAIN_SEGS(sbi), offset);
2418                 if (segno >= MAIN_SEGS(sbi))
2419                         break;
2420                 offset = segno + 1;
2421                 valid_blocks = get_valid_blocks(sbi, segno, 0);
2422                 if (valid_blocks == sbi->blocks_per_seg || !valid_blocks)
2423                         continue;
2424                 if (valid_blocks > sbi->blocks_per_seg) {
2425                         f2fs_bug_on(sbi, 1);
2426                         continue;
2427                 }
2428                 mutex_lock(&dirty_i->seglist_lock);
2429                 __locate_dirty_segment(sbi, segno, DIRTY);
2430                 mutex_unlock(&dirty_i->seglist_lock);
2431         }
2432 }
2433
2434 static int init_victim_secmap(struct f2fs_sb_info *sbi)
2435 {
2436         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
2437         unsigned int bitmap_size = f2fs_bitmap_size(MAIN_SECS(sbi));
2438
2439         dirty_i->victim_secmap = f2fs_kvzalloc(bitmap_size, GFP_KERNEL);
2440         if (!dirty_i->victim_secmap)
2441                 return -ENOMEM;
2442         return 0;
2443 }
2444
2445 static int build_dirty_segmap(struct f2fs_sb_info *sbi)
2446 {
2447         struct dirty_seglist_info *dirty_i;
2448         unsigned int bitmap_size, i;
2449
2450         /* allocate memory for dirty segments list information */
2451         dirty_i = kzalloc(sizeof(struct dirty_seglist_info), GFP_KERNEL);
2452         if (!dirty_i)
2453                 return -ENOMEM;
2454
2455         SM_I(sbi)->dirty_info = dirty_i;
2456         mutex_init(&dirty_i->seglist_lock);
2457
2458         bitmap_size = f2fs_bitmap_size(MAIN_SEGS(sbi));
2459
2460         for (i = 0; i < NR_DIRTY_TYPE; i++) {
2461                 dirty_i->dirty_segmap[i] = f2fs_kvzalloc(bitmap_size, GFP_KERNEL);
2462                 if (!dirty_i->dirty_segmap[i])
2463                         return -ENOMEM;
2464         }
2465
2466         init_dirty_segmap(sbi);
2467         return init_victim_secmap(sbi);
2468 }
2469
2470 /*
2471  * Update min, max modified time for cost-benefit GC algorithm
2472  */
2473 static void init_min_max_mtime(struct f2fs_sb_info *sbi)
2474 {
2475         struct sit_info *sit_i = SIT_I(sbi);
2476         unsigned int segno;
2477
2478         mutex_lock(&sit_i->sentry_lock);
2479
2480         sit_i->min_mtime = LLONG_MAX;
2481
2482         for (segno = 0; segno < MAIN_SEGS(sbi); segno += sbi->segs_per_sec) {
2483                 unsigned int i;
2484                 unsigned long long mtime = 0;
2485
2486                 for (i = 0; i < sbi->segs_per_sec; i++)
2487                         mtime += get_seg_entry(sbi, segno + i)->mtime;
2488
2489                 mtime = div_u64(mtime, sbi->segs_per_sec);
2490
2491                 if (sit_i->min_mtime > mtime)
2492                         sit_i->min_mtime = mtime;
2493         }
2494         sit_i->max_mtime = get_mtime(sbi);
2495         mutex_unlock(&sit_i->sentry_lock);
2496 }
2497
2498 int build_segment_manager(struct f2fs_sb_info *sbi)
2499 {
2500         struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
2501         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
2502         struct f2fs_sm_info *sm_info;
2503         int err;
2504
2505         sm_info = kzalloc(sizeof(struct f2fs_sm_info), GFP_KERNEL);
2506         if (!sm_info)
2507                 return -ENOMEM;
2508
2509         /* init sm info */
2510         sbi->sm_info = sm_info;
2511         sm_info->seg0_blkaddr = le32_to_cpu(raw_super->segment0_blkaddr);
2512         sm_info->main_blkaddr = le32_to_cpu(raw_super->main_blkaddr);
2513         sm_info->segment_count = le32_to_cpu(raw_super->segment_count);
2514         sm_info->reserved_segments = le32_to_cpu(ckpt->rsvd_segment_count);
2515         sm_info->ovp_segments = le32_to_cpu(ckpt->overprov_segment_count);
2516         sm_info->main_segments = le32_to_cpu(raw_super->segment_count_main);
2517         sm_info->ssa_blkaddr = le32_to_cpu(raw_super->ssa_blkaddr);
2518         sm_info->rec_prefree_segments = sm_info->main_segments *
2519                                         DEF_RECLAIM_PREFREE_SEGMENTS / 100;
2520         if (sm_info->rec_prefree_segments > DEF_MAX_RECLAIM_PREFREE_SEGMENTS)
2521                 sm_info->rec_prefree_segments = DEF_MAX_RECLAIM_PREFREE_SEGMENTS;
2522
2523         if (!test_opt(sbi, LFS))
2524                 sm_info->ipu_policy = 1 << F2FS_IPU_FSYNC;
2525         sm_info->min_ipu_util = DEF_MIN_IPU_UTIL;
2526         sm_info->min_fsync_blocks = DEF_MIN_FSYNC_BLOCKS;
2527
2528         INIT_LIST_HEAD(&sm_info->discard_list);
2529         INIT_LIST_HEAD(&sm_info->wait_list);
2530         sm_info->nr_discards = 0;
2531         sm_info->max_discards = 0;
2532
2533         sm_info->trim_sections = DEF_BATCHED_TRIM_SECTIONS;
2534
2535         INIT_LIST_HEAD(&sm_info->sit_entry_set);
2536
2537         if (test_opt(sbi, FLUSH_MERGE) && !f2fs_readonly(sbi->sb)) {
2538                 err = create_flush_cmd_control(sbi);
2539                 if (err)
2540                         return err;
2541         }
2542
2543         err = build_sit_info(sbi);
2544         if (err)
2545                 return err;
2546         err = build_free_segmap(sbi);
2547         if (err)
2548                 return err;
2549         err = build_curseg(sbi);
2550         if (err)
2551                 return err;
2552
2553         /* reinit free segmap based on SIT */
2554         build_sit_entries(sbi);
2555
2556         init_free_segmap(sbi);
2557         err = build_dirty_segmap(sbi);
2558         if (err)
2559                 return err;
2560
2561         init_min_max_mtime(sbi);
2562         return 0;
2563 }
2564
2565 static void discard_dirty_segmap(struct f2fs_sb_info *sbi,
2566                 enum dirty_type dirty_type)
2567 {
2568         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
2569
2570         mutex_lock(&dirty_i->seglist_lock);
2571         kvfree(dirty_i->dirty_segmap[dirty_type]);
2572         dirty_i->nr_dirty[dirty_type] = 0;
2573         mutex_unlock(&dirty_i->seglist_lock);
2574 }
2575
2576 static void destroy_victim_secmap(struct f2fs_sb_info *sbi)
2577 {
2578         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
2579         kvfree(dirty_i->victim_secmap);
2580 }
2581
2582 static void destroy_dirty_segmap(struct f2fs_sb_info *sbi)
2583 {
2584         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
2585         int i;
2586
2587         if (!dirty_i)
2588                 return;
2589
2590         /* discard pre-free/dirty segments list */
2591         for (i = 0; i < NR_DIRTY_TYPE; i++)
2592                 discard_dirty_segmap(sbi, i);
2593
2594         destroy_victim_secmap(sbi);
2595         SM_I(sbi)->dirty_info = NULL;
2596         kfree(dirty_i);
2597 }
2598
2599 static void destroy_curseg(struct f2fs_sb_info *sbi)
2600 {
2601         struct curseg_info *array = SM_I(sbi)->curseg_array;
2602         int i;
2603
2604         if (!array)
2605                 return;
2606         SM_I(sbi)->curseg_array = NULL;
2607         for (i = 0; i < NR_CURSEG_TYPE; i++) {
2608                 kfree(array[i].sum_blk);
2609                 kfree(array[i].journal);
2610         }
2611         kfree(array);
2612 }
2613
2614 static void destroy_free_segmap(struct f2fs_sb_info *sbi)
2615 {
2616         struct free_segmap_info *free_i = SM_I(sbi)->free_info;
2617         if (!free_i)
2618                 return;
2619         SM_I(sbi)->free_info = NULL;
2620         kvfree(free_i->free_segmap);
2621         kvfree(free_i->free_secmap);
2622         kfree(free_i);
2623 }
2624
2625 static void destroy_sit_info(struct f2fs_sb_info *sbi)
2626 {
2627         struct sit_info *sit_i = SIT_I(sbi);
2628         unsigned int start;
2629
2630         if (!sit_i)
2631                 return;
2632
2633         if (sit_i->sentries) {
2634                 for (start = 0; start < MAIN_SEGS(sbi); start++) {
2635                         kfree(sit_i->sentries[start].cur_valid_map);
2636                         kfree(sit_i->sentries[start].ckpt_valid_map);
2637                         kfree(sit_i->sentries[start].discard_map);
2638                 }
2639         }
2640         kfree(sit_i->tmp_map);
2641
2642         kvfree(sit_i->sentries);
2643         kvfree(sit_i->sec_entries);
2644         kvfree(sit_i->dirty_sentries_bitmap);
2645
2646         SM_I(sbi)->sit_info = NULL;
2647         kfree(sit_i->sit_bitmap);
2648         kfree(sit_i);
2649 }
2650
2651 void destroy_segment_manager(struct f2fs_sb_info *sbi)
2652 {
2653         struct f2fs_sm_info *sm_info = SM_I(sbi);
2654
2655         if (!sm_info)
2656                 return;
2657         destroy_flush_cmd_control(sbi);
2658         destroy_dirty_segmap(sbi);
2659         destroy_curseg(sbi);
2660         destroy_free_segmap(sbi);
2661         destroy_sit_info(sbi);
2662         sbi->sm_info = NULL;
2663         kfree(sm_info);
2664 }
2665
2666 int __init create_segment_manager_caches(void)
2667 {
2668         discard_entry_slab = f2fs_kmem_cache_create("discard_entry",
2669                         sizeof(struct discard_entry));
2670         if (!discard_entry_slab)
2671                 goto fail;
2672
2673         bio_entry_slab = f2fs_kmem_cache_create("bio_entry",
2674                         sizeof(struct bio_entry));
2675         if (!bio_entry_slab)
2676                 goto destroy_discard_entry;
2677
2678         sit_entry_set_slab = f2fs_kmem_cache_create("sit_entry_set",
2679                         sizeof(struct sit_entry_set));
2680         if (!sit_entry_set_slab)
2681                 goto destroy_bio_entry;
2682
2683         inmem_entry_slab = f2fs_kmem_cache_create("inmem_page_entry",
2684                         sizeof(struct inmem_pages));
2685         if (!inmem_entry_slab)
2686                 goto destroy_sit_entry_set;
2687         return 0;
2688
2689 destroy_sit_entry_set:
2690         kmem_cache_destroy(sit_entry_set_slab);
2691 destroy_bio_entry:
2692         kmem_cache_destroy(bio_entry_slab);
2693 destroy_discard_entry:
2694         kmem_cache_destroy(discard_entry_slab);
2695 fail:
2696         return -ENOMEM;
2697 }
2698
2699 void destroy_segment_manager_caches(void)
2700 {
2701         kmem_cache_destroy(sit_entry_set_slab);
2702         kmem_cache_destroy(bio_entry_slab);
2703         kmem_cache_destroy(discard_entry_slab);
2704         kmem_cache_destroy(inmem_entry_slab);
2705 }