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 #include <linux/freezer.h>
  20 #include <linux/sched/signal.h>
  21
  22 #include "f2fs.h"
  23 #include "segment.h"
  24 #include "node.h"
  25 #include "gc.h"
  26 #include "trace.h"
  27 #include <trace/events/f2fs.h>
  28
  29 #define __reverse_ffz(x) __reverse_ffs(~(x))
  30
  31 static struct kmem_cache *discard_entry_slab;
  32 static struct kmem_cache *discard_cmd_slab;
  33 static struct kmem_cache *sit_entry_set_slab;
  34 static struct kmem_cache *inmem_entry_slab;
  35
  36 static unsigned long __reverse_ulong(unsigned char *str)
  37 {
  38         unsigned long tmp = 0;
  39         int shift = 24, idx = 0;
  40
  41 #if BITS_PER_LONG == 64
  42         shift = 56;
  43 #endif
  44         while (shift >= 0) {
  45                 tmp |= (unsigned long)str[idx++] << shift;
  46                 shift -= BITS_PER_BYTE;
  47         }
  48         return tmp;
  49 }
  50
  51 /*
  52  * __reverse_ffs is copied from include/asm-generic/bitops/__ffs.h since
  53  * MSB and LSB are reversed in a byte by f2fs_set_bit.
  54  */
  55 static inline unsigned long __reverse_ffs(unsigned long word)
  56 {
  57         int num = 0;
  58
  59 #if BITS_PER_LONG == 64
  60         if ((word & 0xffffffff00000000UL) == 0)
  61                 num += 32;
  62         else
  63                 word >>= 32;
  64 #endif
  65         if ((word & 0xffff0000) == 0)
  66                 num += 16;
  67         else
  68                 word >>= 16;
  69
  70         if ((word & 0xff00) == 0)
  71                 num += 8;
  72         else
  73                 word >>= 8;
  74
  75         if ((word & 0xf0) == 0)
  76                 num += 4;
  77         else
  78                 word >>= 4;
  79
  80         if ((word & 0xc) == 0)
  81                 num += 2;
  82         else
  83                 word >>= 2;
  84
  85         if ((word & 0x2) == 0)
  86                 num += 1;
  87         return num;
  88 }
  89
  90 /*
  91  * __find_rev_next(_zero)_bit is copied from lib/find_next_bit.c because
  92  * f2fs_set_bit makes MSB and LSB reversed in a byte.
  93  * @size must be integral times of unsigned long.
  94  * Example:
  95  *                             MSB <--> LSB
  96  *   f2fs_set_bit(0, bitmap) => 1000 0000
  97  *   f2fs_set_bit(7, bitmap) => 0000 0001
  98  */
  99 static unsigned long __find_rev_next_bit(const unsigned long *addr,
 100                         unsigned long size, unsigned long offset)
 101 {
 102         const unsigned long *p = addr + BIT_WORD(offset);
 103         unsigned long result = size;
 104         unsigned long tmp;
 105
 106         if (offset >= size)
 107                 return size;
 108
 109         size -= (offset & ~(BITS_PER_LONG - 1));
 110         offset %= BITS_PER_LONG;
 111
 112         while (1) {
 113                 if (*p == 0)
 114                         goto pass;
 115
 116                 tmp = __reverse_ulong((unsigned char *)p);
 117
 118                 tmp &= ~0UL >> offset;
 119                 if (size < BITS_PER_LONG)
 120                         tmp &= (~0UL << (BITS_PER_LONG - size));
 121                 if (tmp)
 122                         goto found;
 123 pass:
 124                 if (size <= BITS_PER_LONG)
 125                         break;
 126                 size -= BITS_PER_LONG;
 127                 offset = 0;
 128                 p++;
 129         }
 130         return result;
 131 found:
 132         return result - size + __reverse_ffs(tmp);
 133 }
 134
 135 static unsigned long __find_rev_next_zero_bit(const unsigned long *addr,
 136                         unsigned long size, unsigned long offset)
 137 {
 138         const unsigned long *p = addr + BIT_WORD(offset);
 139         unsigned long result = size;
 140         unsigned long tmp;
 141
 142         if (offset >= size)
 143                 return size;
 144
 145         size -= (offset & ~(BITS_PER_LONG - 1));
 146         offset %= BITS_PER_LONG;
 147
 148         while (1) {
 149                 if (*p == ~0UL)
 150                         goto pass;
 151
 152                 tmp = __reverse_ulong((unsigned char *)p);
 153
 154                 if (offset)
 155                         tmp |= ~0UL << (BITS_PER_LONG - offset);
 156                 if (size < BITS_PER_LONG)
 157                         tmp |= ~0UL >> size;
 158                 if (tmp != ~0UL)
 159                         goto found;
 160 pass:
 161                 if (size <= BITS_PER_LONG)
 162                         break;
 163                 size -= BITS_PER_LONG;
 164                 offset = 0;
 165                 p++;
 166         }
 167         return result;
 168 found:
 169         return result - size + __reverse_ffz(tmp);
 170 }
 171
 172 bool f2fs_need_SSR(struct f2fs_sb_info *sbi)
 173 {
 174         int node_secs = get_blocktype_secs(sbi, F2FS_DIRTY_NODES);
 175         int dent_secs = get_blocktype_secs(sbi, F2FS_DIRTY_DENTS);
 176         int imeta_secs = get_blocktype_secs(sbi, F2FS_DIRTY_IMETA);
 177
 178         if (test_opt(sbi, LFS))
 179                 return false;
 180         if (sbi->gc_mode == GC_URGENT)
 181                 return true;
 182
 183         return free_sections(sbi) <= (node_secs + 2 * dent_secs + imeta_secs +
 184                         SM_I(sbi)->min_ssr_sections + reserved_sections(sbi));
 185 }
 186
 187 void f2fs_register_inmem_page(struct inode *inode, struct page *page)
 188 {
 189         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 190         struct f2fs_inode_info *fi = F2FS_I(inode);
 191         struct inmem_pages *new;
 192
 193         f2fs_trace_pid(page);
 194
 195         set_page_private(page, (unsigned long)ATOMIC_WRITTEN_PAGE);
 196         SetPagePrivate(page);
 197
 198         new = f2fs_kmem_cache_alloc(inmem_entry_slab, GFP_NOFS);
 199
 200         /* add atomic page indices to the list */
 201         new->page = page;
 202         INIT_LIST_HEAD(&new->list);
 203
 204         /* increase reference count with clean state */
 205         mutex_lock(&fi->inmem_lock);
 206         get_page(page);
 207         list_add_tail(&new->list, &fi->inmem_pages);
 208         spin_lock(&sbi->inode_lock[ATOMIC_FILE]);
 209         if (list_empty(&fi->inmem_ilist))
 210                 list_add_tail(&fi->inmem_ilist, &sbi->inode_list[ATOMIC_FILE]);
 211         spin_unlock(&sbi->inode_lock[ATOMIC_FILE]);
 212         inc_page_count(F2FS_I_SB(inode), F2FS_INMEM_PAGES);
 213         mutex_unlock(&fi->inmem_lock);
 214
 215         trace_f2fs_register_inmem_page(page, INMEM);
 216 }
 217
 218 static int __revoke_inmem_pages(struct inode *inode,
 219                                 struct list_head *head, bool drop, bool recover)
 220 {
 221         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 222         struct inmem_pages *cur, *tmp;
 223         int err = 0;
 224
 225         list_for_each_entry_safe(cur, tmp, head, list) {
 226                 struct page *page = cur->page;
 227
 228                 if (drop)
 229                         trace_f2fs_commit_inmem_page(page, INMEM_DROP);
 230
 231                 lock_page(page);
 232
 233                 f2fs_wait_on_page_writeback(page, DATA, true);
 234
 235                 if (recover) {
 236                         struct dnode_of_data dn;
 237                         struct node_info ni;
 238
 239                         trace_f2fs_commit_inmem_page(page, INMEM_REVOKE);
 240 retry:
 241                         set_new_dnode(&dn, inode, NULL, NULL, 0);
 242                         err = f2fs_get_dnode_of_data(&dn, page->index,
 243                                                                 LOOKUP_NODE);
 244                         if (err) {
 245                                 if (err == -ENOMEM) {
 246                                         congestion_wait(BLK_RW_ASYNC, HZ/50);
 247                                         cond_resched();
 248                                         goto retry;
 249                                 }
 250                                 err = -EAGAIN;
 251                                 goto next;
 252                         }
 253                         f2fs_get_node_info(sbi, dn.nid, &ni);
 254                         if (cur->old_addr == NEW_ADDR) {
 255                                 f2fs_invalidate_blocks(sbi, dn.data_blkaddr);
 256                                 f2fs_update_data_blkaddr(&dn, NEW_ADDR);
 257                         } else
 258                                 f2fs_replace_block(sbi, &dn, dn.data_blkaddr,
 259                                         cur->old_addr, ni.version, true, true);
 260                         f2fs_put_dnode(&dn);
 261                 }
 262 next:
 263                 /* we don't need to invalidate this in the sccessful status */
 264                 if (drop || recover)
 265                         ClearPageUptodate(page);
 266                 set_page_private(page, 0);
 267                 ClearPagePrivate(page);
 268                 f2fs_put_page(page, 1);
 269
 270                 list_del(&cur->list);
 271                 kmem_cache_free(inmem_entry_slab, cur);
 272                 dec_page_count(F2FS_I_SB(inode), F2FS_INMEM_PAGES);
 273         }
 274         return err;
 275 }
 276
 277 void f2fs_drop_inmem_pages_all(struct f2fs_sb_info *sbi, bool gc_failure)
 278 {
 279         struct list_head *head = &sbi->inode_list[ATOMIC_FILE];
 280         struct inode *inode;
 281         struct f2fs_inode_info *fi;
 282 next:
 283         spin_lock(&sbi->inode_lock[ATOMIC_FILE]);
 284         if (list_empty(head)) {
 285                 spin_unlock(&sbi->inode_lock[ATOMIC_FILE]);
 286                 return;
 287         }
 288         fi = list_first_entry(head, struct f2fs_inode_info, inmem_ilist);
 289         inode = igrab(&fi->vfs_inode);
 290         spin_unlock(&sbi->inode_lock[ATOMIC_FILE]);
 291
 292         if (inode) {
 293                 if (gc_failure) {
 294                         if (fi->i_gc_failures[GC_FAILURE_ATOMIC])
 295                                 goto drop;
 296                         goto skip;
 297                 }
 298 drop:
 299                 set_inode_flag(inode, FI_ATOMIC_REVOKE_REQUEST);
 300                 f2fs_drop_inmem_pages(inode);
 301                 iput(inode);
 302         }
 303 skip:
 304         congestion_wait(BLK_RW_ASYNC, HZ/50);
 305         cond_resched();
 306         goto next;
 307 }
 308
 309 void f2fs_drop_inmem_pages(struct inode *inode)
 310 {
 311         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 312         struct f2fs_inode_info *fi = F2FS_I(inode);
 313
 314         mutex_lock(&fi->inmem_lock);
 315         __revoke_inmem_pages(inode, &fi->inmem_pages, true, false);
 316         spin_lock(&sbi->inode_lock[ATOMIC_FILE]);
 317         if (!list_empty(&fi->inmem_ilist))
 318                 list_del_init(&fi->inmem_ilist);
 319         spin_unlock(&sbi->inode_lock[ATOMIC_FILE]);
 320         mutex_unlock(&fi->inmem_lock);
 321
 322         clear_inode_flag(inode, FI_ATOMIC_FILE);
 323         fi->i_gc_failures[GC_FAILURE_ATOMIC] = 0;
 324         stat_dec_atomic_write(inode);
 325 }
 326
 327 void f2fs_drop_inmem_page(struct inode *inode, struct page *page)
 328 {
 329         struct f2fs_inode_info *fi = F2FS_I(inode);
 330         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 331         struct list_head *head = &fi->inmem_pages;
 332         struct inmem_pages *cur = NULL;
 333
 334         f2fs_bug_on(sbi, !IS_ATOMIC_WRITTEN_PAGE(page));
 335
 336         mutex_lock(&fi->inmem_lock);
 337         list_for_each_entry(cur, head, list) {
 338                 if (cur->page == page)
 339                         break;
 340         }
 341
 342         f2fs_bug_on(sbi, list_empty(head) || cur->page != page);
 343         list_del(&cur->list);
 344         mutex_unlock(&fi->inmem_lock);
 345
 346         dec_page_count(sbi, F2FS_INMEM_PAGES);
 347         kmem_cache_free(inmem_entry_slab, cur);
 348
 349         ClearPageUptodate(page);
 350         set_page_private(page, 0);
 351         ClearPagePrivate(page);
 352         f2fs_put_page(page, 0);
 353
 354         trace_f2fs_commit_inmem_page(page, INMEM_INVALIDATE);
 355 }
 356
 357 static int __f2fs_commit_inmem_pages(struct inode *inode)
 358 {
 359         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 360         struct f2fs_inode_info *fi = F2FS_I(inode);
 361         struct inmem_pages *cur, *tmp;
 362         struct f2fs_io_info fio = {
 363                 .sbi = sbi,
 364                 .ino = inode->i_ino,
 365                 .type = DATA,
 366                 .op = REQ_OP_WRITE,
 367                 .op_flags = REQ_SYNC | REQ_PRIO,
 368                 .io_type = FS_DATA_IO,
 369         };
 370         struct list_head revoke_list;
 371         pgoff_t last_idx = ULONG_MAX;
 372         int err = 0;
 373
 374         INIT_LIST_HEAD(&revoke_list);
 375
 376         list_for_each_entry_safe(cur, tmp, &fi->inmem_pages, list) {
 377                 struct page *page = cur->page;
 378
 379                 lock_page(page);
 380                 if (page->mapping == inode->i_mapping) {
 381                         trace_f2fs_commit_inmem_page(page, INMEM);
 382
 383                         set_page_dirty(page);
 384                         f2fs_wait_on_page_writeback(page, DATA, true);
 385                         if (clear_page_dirty_for_io(page)) {
 386                                 inode_dec_dirty_pages(inode);
 387                                 f2fs_remove_dirty_inode(inode);
 388                         }
 389 retry:
 390                         fio.page = page;
 391                         fio.old_blkaddr = NULL_ADDR;
 392                         fio.encrypted_page = NULL;
 393                         fio.need_lock = LOCK_DONE;
 394                         err = f2fs_do_write_data_page(&fio);
 395                         if (err) {
 396                                 if (err == -ENOMEM) {
 397                                         congestion_wait(BLK_RW_ASYNC, HZ/50);
 398                                         cond_resched();
 399                                         goto retry;
 400                                 }
 401                                 unlock_page(page);
 402                                 break;
 403                         }
 404                         /* record old blkaddr for revoking */
 405                         cur->old_addr = fio.old_blkaddr;
 406                         last_idx = page->index;
 407                 }
 408                 unlock_page(page);
 409                 list_move_tail(&cur->list, &revoke_list);
 410         }
 411
 412         if (last_idx != ULONG_MAX)
 413                 f2fs_submit_merged_write_cond(sbi, inode, 0, last_idx, DATA);
 414
 415         if (err) {
 416                 /*
 417                  * try to revoke all committed pages, but still we could fail
 418                  * due to no memory or other reason, if that happened, EAGAIN
 419                  * will be returned, which means in such case, transaction is
 420                  * already not integrity, caller should use journal to do the
 421                  * recovery or rewrite & commit last transaction. For other
 422                  * error number, revoking was done by filesystem itself.
 423                  */
 424                 err = __revoke_inmem_pages(inode, &revoke_list, false, true);
 425
 426                 /* drop all uncommitted pages */
 427                 __revoke_inmem_pages(inode, &fi->inmem_pages, true, false);
 428         } else {
 429                 __revoke_inmem_pages(inode, &revoke_list, false, false);
 430         }
 431
 432         return err;
 433 }
 434
 435 int f2fs_commit_inmem_pages(struct inode *inode)
 436 {
 437         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 438         struct f2fs_inode_info *fi = F2FS_I(inode);
 439         int err;
 440
 441         f2fs_balance_fs(sbi, true);
 442         f2fs_lock_op(sbi);
 443
 444         set_inode_flag(inode, FI_ATOMIC_COMMIT);
 445
 446         mutex_lock(&fi->inmem_lock);
 447         err = __f2fs_commit_inmem_pages(inode);
 448
 449         spin_lock(&sbi->inode_lock[ATOMIC_FILE]);
 450         if (!list_empty(&fi->inmem_ilist))
 451                 list_del_init(&fi->inmem_ilist);
 452         spin_unlock(&sbi->inode_lock[ATOMIC_FILE]);
 453         mutex_unlock(&fi->inmem_lock);
 454
 455         clear_inode_flag(inode, FI_ATOMIC_COMMIT);
 456
 457         f2fs_unlock_op(sbi);
 458         return err;
 459 }
 460
 461 /*
 462  * This function balances dirty node and dentry pages.
 463  * In addition, it controls garbage collection.
 464  */
 465 void f2fs_balance_fs(struct f2fs_sb_info *sbi, bool need)
 466 {
 467 #ifdef CONFIG_F2FS_FAULT_INJECTION
 468         if (time_to_inject(sbi, FAULT_CHECKPOINT)) {
 469                 f2fs_show_injection_info(FAULT_CHECKPOINT);
 470                 f2fs_stop_checkpoint(sbi, false);
 471         }
 472 #endif
 473
 474         /* balance_fs_bg is able to be pending */
 475         if (need && excess_cached_nats(sbi))
 476                 f2fs_balance_fs_bg(sbi);
 477
 478         /*
 479          * We should do GC or end up with checkpoint, if there are so many dirty
 480          * dir/node pages without enough free segments.
 481          */
 482         if (has_not_enough_free_secs(sbi, 0, 0)) {
 483                 mutex_lock(&sbi->gc_mutex);
 484                 f2fs_gc(sbi, false, false, NULL_SEGNO);
 485         }
 486 }
 487
 488 void f2fs_balance_fs_bg(struct f2fs_sb_info *sbi)
 489 {
 490         if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
 491                 return;
 492
 493         /* try to shrink extent cache when there is no enough memory */
 494         if (!f2fs_available_free_memory(sbi, EXTENT_CACHE))
 495                 f2fs_shrink_extent_tree(sbi, EXTENT_CACHE_SHRINK_NUMBER);
 496
 497         /* check the # of cached NAT entries */
 498         if (!f2fs_available_free_memory(sbi, NAT_ENTRIES))
 499                 f2fs_try_to_free_nats(sbi, NAT_ENTRY_PER_BLOCK);
 500
 501         if (!f2fs_available_free_memory(sbi, FREE_NIDS))
 502                 f2fs_try_to_free_nids(sbi, MAX_FREE_NIDS);
 503         else
 504                 f2fs_build_free_nids(sbi, false, false);
 505
 506         if (!is_idle(sbi) && !excess_dirty_nats(sbi))
 507                 return;
 508
 509         /* checkpoint is the only way to shrink partial cached entries */
 510         if (!f2fs_available_free_memory(sbi, NAT_ENTRIES) ||
 511                         !f2fs_available_free_memory(sbi, INO_ENTRIES) ||
 512                         excess_prefree_segs(sbi) ||
 513                         excess_dirty_nats(sbi) ||
 514                         f2fs_time_over(sbi, CP_TIME)) {
 515                 if (test_opt(sbi, DATA_FLUSH)) {
 516                         struct blk_plug plug;
 517
 518                         blk_start_plug(&plug);
 519                         f2fs_sync_dirty_inodes(sbi, FILE_INODE);
 520                         blk_finish_plug(&plug);
 521                 }
 522                 f2fs_sync_fs(sbi->sb, true);
 523                 stat_inc_bg_cp_count(sbi->stat_info);
 524         }
 525 }
 526
 527 static int __submit_flush_wait(struct f2fs_sb_info *sbi,
 528                                 struct block_device *bdev)
 529 {
 530         struct bio *bio = f2fs_bio_alloc(sbi, 0, true);
 531         int ret;
 532
 533         bio->bi_opf = REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH;
 534         bio_set_dev(bio, bdev);
 535         ret = submit_bio_wait(bio);
 536         bio_put(bio);
 537
 538         trace_f2fs_issue_flush(bdev, test_opt(sbi, NOBARRIER),
 539                                 test_opt(sbi, FLUSH_MERGE), ret);
 540         return ret;
 541 }
 542
 543 static int submit_flush_wait(struct f2fs_sb_info *sbi, nid_t ino)
 544 {
 545         int ret = 0;
 546         int i;
 547
 548         if (!sbi->s_ndevs)
 549                 return __submit_flush_wait(sbi, sbi->sb->s_bdev);
 550
 551         for (i = 0; i < sbi->s_ndevs; i++) {
 552                 if (!f2fs_is_dirty_device(sbi, ino, i, FLUSH_INO))
 553                         continue;
 554                 ret = __submit_flush_wait(sbi, FDEV(i).bdev);
 555                 if (ret)
 556                         break;
 557         }
 558         return ret;
 559 }
 560
 561 static int issue_flush_thread(void *data)
 562 {
 563         struct f2fs_sb_info *sbi = data;
 564         struct flush_cmd_control *fcc = SM_I(sbi)->fcc_info;
 565         wait_queue_head_t *q = &fcc->flush_wait_queue;
 566 repeat:
 567         if (kthread_should_stop())
 568                 return 0;
 569
 570         sb_start_intwrite(sbi->sb);
 571
 572         if (!llist_empty(&fcc->issue_list)) {
 573                 struct flush_cmd *cmd, *next;
 574                 int ret;
 575
 576                 fcc->dispatch_list = llist_del_all(&fcc->issue_list);
 577                 fcc->dispatch_list = llist_reverse_order(fcc->dispatch_list);
 578
 579                 cmd = llist_entry(fcc->dispatch_list, struct flush_cmd, llnode);
 580
 581                 ret = submit_flush_wait(sbi, cmd->ino);
 582                 atomic_inc(&fcc->issued_flush);
 583
 584                 llist_for_each_entry_safe(cmd, next,
 585                                           fcc->dispatch_list, llnode) {
 586                         cmd->ret = ret;
 587                         complete(&cmd->wait);
 588                 }
 589                 fcc->dispatch_list = NULL;
 590         }
 591
 592         sb_end_intwrite(sbi->sb);
 593
 594         wait_event_interruptible(*q,
 595                 kthread_should_stop() || !llist_empty(&fcc->issue_list));
 596         goto repeat;
 597 }
 598
 599 int f2fs_issue_flush(struct f2fs_sb_info *sbi, nid_t ino)
 600 {
 601         struct flush_cmd_control *fcc = SM_I(sbi)->fcc_info;
 602         struct flush_cmd cmd;
 603         int ret;
 604
 605         if (test_opt(sbi, NOBARRIER))
 606                 return 0;
 607
 608         if (!test_opt(sbi, FLUSH_MERGE)) {
 609                 ret = submit_flush_wait(sbi, ino);
 610                 atomic_inc(&fcc->issued_flush);
 611                 return ret;
 612         }
 613
 614         if (atomic_inc_return(&fcc->issing_flush) == 1 || sbi->s_ndevs > 1) {
 615                 ret = submit_flush_wait(sbi, ino);
 616                 atomic_dec(&fcc->issing_flush);
 617
 618                 atomic_inc(&fcc->issued_flush);
 619                 return ret;
 620         }
 621
 622         cmd.ino = ino;
 623         init_completion(&cmd.wait);
 624
 625         llist_add(&cmd.llnode, &fcc->issue_list);
 626
 627         /* update issue_list before we wake up issue_flush thread */
 628         smp_mb();
 629
 630         if (waitqueue_active(&fcc->flush_wait_queue))
 631                 wake_up(&fcc->flush_wait_queue);
 632
 633         if (fcc->f2fs_issue_flush) {
 634                 wait_for_completion(&cmd.wait);
 635                 atomic_dec(&fcc->issing_flush);
 636         } else {
 637                 struct llist_node *list;
 638
 639                 list = llist_del_all(&fcc->issue_list);
 640                 if (!list) {
 641                         wait_for_completion(&cmd.wait);
 642                         atomic_dec(&fcc->issing_flush);
 643                 } else {
 644                         struct flush_cmd *tmp, *next;
 645
 646                         ret = submit_flush_wait(sbi, ino);
 647
 648                         llist_for_each_entry_safe(tmp, next, list, llnode) {
 649                                 if (tmp == &cmd) {
 650                                         cmd.ret = ret;
 651                                         atomic_dec(&fcc->issing_flush);
 652                                         continue;
 653                                 }
 654                                 tmp->ret = ret;
 655                                 complete(&tmp->wait);
 656                         }
 657                 }
 658         }
 659
 660         return cmd.ret;
 661 }
 662
 663 int f2fs_create_flush_cmd_control(struct f2fs_sb_info *sbi)
 664 {
 665         dev_t dev = sbi->sb->s_bdev->bd_dev;
 666         struct flush_cmd_control *fcc;
 667         int err = 0;
 668
 669         if (SM_I(sbi)->fcc_info) {
 670                 fcc = SM_I(sbi)->fcc_info;
 671                 if (fcc->f2fs_issue_flush)
 672                         return err;
 673                 goto init_thread;
 674         }
 675
 676         fcc = f2fs_kzalloc(sbi, sizeof(struct flush_cmd_control), GFP_KERNEL);
 677         if (!fcc)
 678                 return -ENOMEM;
 679         atomic_set(&fcc->issued_flush, 0);
 680         atomic_set(&fcc->issing_flush, 0);
 681         init_waitqueue_head(&fcc->flush_wait_queue);
 682         init_llist_head(&fcc->issue_list);
 683         SM_I(sbi)->fcc_info = fcc;
 684         if (!test_opt(sbi, FLUSH_MERGE))
 685                 return err;
 686
 687 init_thread:
 688         fcc->f2fs_issue_flush = kthread_run(issue_flush_thread, sbi,
 689                                 "f2fs_flush-%u:%u", MAJOR(dev), MINOR(dev));
 690         if (IS_ERR(fcc->f2fs_issue_flush)) {
 691                 err = PTR_ERR(fcc->f2fs_issue_flush);
 692                 kfree(fcc);
 693                 SM_I(sbi)->fcc_info = NULL;
 694                 return err;
 695         }
 696
 697         return err;
 698 }
 699
 700 void f2fs_destroy_flush_cmd_control(struct f2fs_sb_info *sbi, bool free)
 701 {
 702         struct flush_cmd_control *fcc = SM_I(sbi)->fcc_info;
 703
 704         if (fcc && fcc->f2fs_issue_flush) {
 705                 struct task_struct *flush_thread = fcc->f2fs_issue_flush;
 706
 707                 fcc->f2fs_issue_flush = NULL;
 708                 kthread_stop(flush_thread);
 709         }
 710         if (free) {
 711                 kfree(fcc);
 712                 SM_I(sbi)->fcc_info = NULL;
 713         }
 714 }
 715
 716 int f2fs_flush_device_cache(struct f2fs_sb_info *sbi)
 717 {
 718         int ret = 0, i;
 719
 720         if (!sbi->s_ndevs)
 721                 return 0;
 722
 723         for (i = 1; i < sbi->s_ndevs; i++) {
 724                 if (!f2fs_test_bit(i, (char *)&sbi->dirty_device))
 725                         continue;
 726                 ret = __submit_flush_wait(sbi, FDEV(i).bdev);
 727                 if (ret)
 728                         break;
 729
 730                 spin_lock(&sbi->dev_lock);
 731                 f2fs_clear_bit(i, (char *)&sbi->dirty_device);
 732                 spin_unlock(&sbi->dev_lock);
 733         }
 734
 735         return ret;
 736 }
 737
 738 static void __locate_dirty_segment(struct f2fs_sb_info *sbi, unsigned int segno,
 739                 enum dirty_type dirty_type)
 740 {
 741         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
 742
 743         /* need not be added */
 744         if (IS_CURSEG(sbi, segno))
 745                 return;
 746
 747         if (!test_and_set_bit(segno, dirty_i->dirty_segmap[dirty_type]))
 748                 dirty_i->nr_dirty[dirty_type]++;
 749
 750         if (dirty_type == DIRTY) {
 751                 struct seg_entry *sentry = get_seg_entry(sbi, segno);
 752                 enum dirty_type t = sentry->type;
 753
 754                 if (unlikely(t >= DIRTY)) {
 755                         f2fs_bug_on(sbi, 1);
 756                         return;
 757                 }
 758                 if (!test_and_set_bit(segno, dirty_i->dirty_segmap[t]))
 759                         dirty_i->nr_dirty[t]++;
 760         }
 761 }
 762
 763 static void __remove_dirty_segment(struct f2fs_sb_info *sbi, unsigned int segno,
 764                 enum dirty_type dirty_type)
 765 {
 766         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
 767
 768         if (test_and_clear_bit(segno, dirty_i->dirty_segmap[dirty_type]))
 769                 dirty_i->nr_dirty[dirty_type]--;
 770
 771         if (dirty_type == DIRTY) {
 772                 struct seg_entry *sentry = get_seg_entry(sbi, segno);
 773                 enum dirty_type t = sentry->type;
 774
 775                 if (test_and_clear_bit(segno, dirty_i->dirty_segmap[t]))
 776                         dirty_i->nr_dirty[t]--;
 777
 778                 if (get_valid_blocks(sbi, segno, true) == 0)
 779                         clear_bit(GET_SEC_FROM_SEG(sbi, segno),
 780                                                 dirty_i->victim_secmap);
 781         }
 782 }
 783
 784 /*
 785  * Should not occur error such as -ENOMEM.
 786  * Adding dirty entry into seglist is not critical operation.
 787  * If a given segment is one of current working segments, it won't be added.
 788  */
 789 static void locate_dirty_segment(struct f2fs_sb_info *sbi, unsigned int segno)
 790 {
 791         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
 792         unsigned short valid_blocks;
 793
 794         if (segno == NULL_SEGNO || IS_CURSEG(sbi, segno))
 795                 return;
 796
 797         mutex_lock(&dirty_i->seglist_lock);
 798
 799         valid_blocks = get_valid_blocks(sbi, segno, false);
 800
 801         if (valid_blocks == 0) {
 802                 __locate_dirty_segment(sbi, segno, PRE);
 803                 __remove_dirty_segment(sbi, segno, DIRTY);
 804         } else if (valid_blocks < sbi->blocks_per_seg) {
 805                 __locate_dirty_segment(sbi, segno, DIRTY);
 806         } else {
 807                 /* Recovery routine with SSR needs this */
 808                 __remove_dirty_segment(sbi, segno, DIRTY);
 809         }
 810
 811         mutex_unlock(&dirty_i->seglist_lock);
 812 }
 813
 814 static struct discard_cmd *__create_discard_cmd(struct f2fs_sb_info *sbi,
 815                 struct block_device *bdev, block_t lstart,
 816                 block_t start, block_t len)
 817 {
 818         struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
 819         struct list_head *pend_list;
 820         struct discard_cmd *dc;
 821
 822         f2fs_bug_on(sbi, !len);
 823
 824         pend_list = &dcc->pend_list[plist_idx(len)];
 825
 826         dc = f2fs_kmem_cache_alloc(discard_cmd_slab, GFP_NOFS);
 827         INIT_LIST_HEAD(&dc->list);
 828         dc->bdev = bdev;
 829         dc->lstart = lstart;
 830         dc->start = start;
 831         dc->len = len;
 832         dc->ref = 0;
 833         dc->state = D_PREP;
 834         dc->error = 0;
 835         init_completion(&dc->wait);
 836         list_add_tail(&dc->list, pend_list);
 837         atomic_inc(&dcc->discard_cmd_cnt);
 838         dcc->undiscard_blks += len;
 839
 840         return dc;
 841 }
 842
 843 static struct discard_cmd *__attach_discard_cmd(struct f2fs_sb_info *sbi,
 844                                 struct block_device *bdev, block_t lstart,
 845                                 block_t start, block_t len,
 846                                 struct rb_node *parent, struct rb_node **p)
 847 {
 848         struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
 849         struct discard_cmd *dc;
 850
 851         dc = __create_discard_cmd(sbi, bdev, lstart, start, len);
 852
 853         rb_link_node(&dc->rb_node, parent, p);
 854         rb_insert_color(&dc->rb_node, &dcc->root);
 855
 856         return dc;
 857 }
 858
 859 static void __detach_discard_cmd(struct discard_cmd_control *dcc,
 860                                                         struct discard_cmd *dc)
 861 {
 862         if (dc->state == D_DONE)
 863                 atomic_dec(&dcc->issing_discard);
 864
 865         list_del(&dc->list);
 866         rb_erase(&dc->rb_node, &dcc->root);
 867         dcc->undiscard_blks -= dc->len;
 868
 869         kmem_cache_free(discard_cmd_slab, dc);
 870
 871         atomic_dec(&dcc->discard_cmd_cnt);
 872 }
 873
 874 static void __remove_discard_cmd(struct f2fs_sb_info *sbi,
 875                                                         struct discard_cmd *dc)
 876 {
 877         struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
 878
 879         trace_f2fs_remove_discard(dc->bdev, dc->start, dc->len);
 880
 881         f2fs_bug_on(sbi, dc->ref);
 882
 883         if (dc->error == -EOPNOTSUPP)
 884                 dc->error = 0;
 885
 886         if (dc->error)
 887                 f2fs_msg(sbi->sb, KERN_INFO,
 888                         "Issue discard(%u, %u, %u) failed, ret: %d",
 889                         dc->lstart, dc->start, dc->len, dc->error);
 890         __detach_discard_cmd(dcc, dc);
 891 }
 892
 893 static void f2fs_submit_discard_endio(struct bio *bio)
 894 {
 895         struct discard_cmd *dc = (struct discard_cmd *)bio->bi_private;
 896
 897         dc->error = blk_status_to_errno(bio->bi_status);
 898         dc->state = D_DONE;
 899         complete_all(&dc->wait);
 900         bio_put(bio);
 901 }
 902
 903 static void __check_sit_bitmap(struct f2fs_sb_info *sbi,
 904                                 block_t start, block_t end)
 905 {
 906 #ifdef CONFIG_F2FS_CHECK_FS
 907         struct seg_entry *sentry;
 908         unsigned int segno;
 909         block_t blk = start;
 910         unsigned long offset, size, max_blocks = sbi->blocks_per_seg;
 911         unsigned long *map;
 912
 913         while (blk < end) {
 914                 segno = GET_SEGNO(sbi, blk);
 915                 sentry = get_seg_entry(sbi, segno);
 916                 offset = GET_BLKOFF_FROM_SEG0(sbi, blk);
 917
 918                 if (end < START_BLOCK(sbi, segno + 1))
 919                         size = GET_BLKOFF_FROM_SEG0(sbi, end);
 920                 else
 921                         size = max_blocks;
 922                 map = (unsigned long *)(sentry->cur_valid_map);
 923                 offset = __find_rev_next_bit(map, size, offset);
 924                 f2fs_bug_on(sbi, offset != size);
 925                 blk = START_BLOCK(sbi, segno + 1);
 926         }
 927 #endif
 928 }
 929
 930 static void __init_discard_policy(struct f2fs_sb_info *sbi,
 931                                 struct discard_policy *dpolicy,
 932                                 int discard_type, unsigned int granularity)
 933 {
 934         /* common policy */
 935         dpolicy->type = discard_type;
 936         dpolicy->sync = true;
 937         dpolicy->granularity = granularity;
 938
 939         dpolicy->max_requests = DEF_MAX_DISCARD_REQUEST;
 940         dpolicy->io_aware_gran = MAX_PLIST_NUM;
 941
 942         if (discard_type == DPOLICY_BG) {
 943                 dpolicy->min_interval = DEF_MIN_DISCARD_ISSUE_TIME;
 944                 dpolicy->mid_interval = DEF_MID_DISCARD_ISSUE_TIME;
 945                 dpolicy->max_interval = DEF_MAX_DISCARD_ISSUE_TIME;
 946                 dpolicy->io_aware = true;
 947                 dpolicy->sync = false;
 948                 if (utilization(sbi) > DEF_DISCARD_URGENT_UTIL) {
 949                         dpolicy->granularity = 1;
 950                         dpolicy->max_interval = DEF_MIN_DISCARD_ISSUE_TIME;
 951                 }
 952         } else if (discard_type == DPOLICY_FORCE) {
 953                 dpolicy->min_interval = DEF_MIN_DISCARD_ISSUE_TIME;
 954                 dpolicy->mid_interval = DEF_MID_DISCARD_ISSUE_TIME;
 955                 dpolicy->max_interval = DEF_MAX_DISCARD_ISSUE_TIME;
 956                 dpolicy->io_aware = false;
 957         } else if (discard_type == DPOLICY_FSTRIM) {
 958                 dpolicy->io_aware = false;
 959         } else if (discard_type == DPOLICY_UMOUNT) {
 960                 dpolicy->max_requests = UINT_MAX;
 961                 dpolicy->io_aware = false;
 962         }
 963 }
 964
 965
 966 /* this function is copied from blkdev_issue_discard from block/blk-lib.c */
 967 static void __submit_discard_cmd(struct f2fs_sb_info *sbi,
 968                                                 struct discard_policy *dpolicy,
 969                                                 struct discard_cmd *dc)
 970 {
 971         struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
 972         struct list_head *wait_list = (dpolicy->type == DPOLICY_FSTRIM) ?
 973                                         &(dcc->fstrim_list) : &(dcc->wait_list);
 974         struct bio *bio = NULL;
 975         int flag = dpolicy->sync ? REQ_SYNC : 0;
 976
 977         if (dc->state != D_PREP)
 978                 return;
 979
 980         if (is_sbi_flag_set(sbi, SBI_NEED_FSCK))
 981                 return;
 982
 983         trace_f2fs_issue_discard(dc->bdev, dc->start, dc->len);
 984
 985         dc->error = __blkdev_issue_discard(dc->bdev,
 986                                 SECTOR_FROM_BLOCK(dc->start),
 987                                 SECTOR_FROM_BLOCK(dc->len),
 988                                 GFP_NOFS, 0, &bio);
 989         if (!dc->error) {
 990                 /* should keep before submission to avoid D_DONE right away */
 991                 dc->state = D_SUBMIT;
 992                 atomic_inc(&dcc->issued_discard);
 993                 atomic_inc(&dcc->issing_discard);
 994                 if (bio) {
 995                         bio->bi_private = dc;
 996                         bio->bi_end_io = f2fs_submit_discard_endio;
 997                         bio->bi_opf |= flag;
 998                         submit_bio(bio);
 999                         list_move_tail(&dc->list, wait_list);
1000                         __check_sit_bitmap(sbi, dc->start, dc->start + dc->len);
1001
1002                         f2fs_update_iostat(sbi, FS_DISCARD, 1);
1003                 }
1004         } else {
1005                 __remove_discard_cmd(sbi, dc);
1006         }
1007 }
1008
1009 static struct discard_cmd *__insert_discard_tree(struct f2fs_sb_info *sbi,
1010                                 struct block_device *bdev, block_t lstart,
1011                                 block_t start, block_t len,
1012                                 struct rb_node **insert_p,
1013                                 struct rb_node *insert_parent)
1014 {
1015         struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
1016         struct rb_node **p;
1017         struct rb_node *parent = NULL;
1018         struct discard_cmd *dc = NULL;
1019
1020         if (insert_p && insert_parent) {
1021                 parent = insert_parent;
1022                 p = insert_p;
1023                 goto do_insert;
1024         }
1025
1026         p = f2fs_lookup_rb_tree_for_insert(sbi, &dcc->root, &parent, lstart);
1027 do_insert:
1028         dc = __attach_discard_cmd(sbi, bdev, lstart, start, len, parent, p);
1029         if (!dc)
1030                 return NULL;
1031
1032         return dc;
1033 }
1034
1035 static void __relocate_discard_cmd(struct discard_cmd_control *dcc,
1036                                                 struct discard_cmd *dc)
1037 {
1038         list_move_tail(&dc->list, &dcc->pend_list[plist_idx(dc->len)]);
1039 }
1040
1041 static void __punch_discard_cmd(struct f2fs_sb_info *sbi,
1042                                 struct discard_cmd *dc, block_t blkaddr)
1043 {
1044         struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
1045         struct discard_info di = dc->di;
1046         bool modified = false;
1047
1048         if (dc->state == D_DONE || dc->len == 1) {
1049                 __remove_discard_cmd(sbi, dc);
1050                 return;
1051         }
1052
1053         dcc->undiscard_blks -= di.len;
1054
1055         if (blkaddr > di.lstart) {
1056                 dc->len = blkaddr - dc->lstart;
1057                 dcc->undiscard_blks += dc->len;
1058                 __relocate_discard_cmd(dcc, dc);
1059                 modified = true;
1060         }
1061
1062         if (blkaddr < di.lstart + di.len - 1) {
1063                 if (modified) {
1064                         __insert_discard_tree(sbi, dc->bdev, blkaddr + 1,
1065                                         di.start + blkaddr + 1 - di.lstart,
1066                                         di.lstart + di.len - 1 - blkaddr,
1067                                         NULL, NULL);
1068                 } else {
1069                         dc->lstart++;
1070                         dc->len--;
1071                         dc->start++;
1072                         dcc->undiscard_blks += dc->len;
1073                         __relocate_discard_cmd(dcc, dc);
1074                 }
1075         }
1076 }
1077
1078 static void __update_discard_tree_range(struct f2fs_sb_info *sbi,
1079                                 struct block_device *bdev, block_t lstart,
1080                                 block_t start, block_t len)
1081 {
1082         struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
1083         struct discard_cmd *prev_dc = NULL, *next_dc = NULL;
1084         struct discard_cmd *dc;
1085         struct discard_info di = {0};
1086         struct rb_node **insert_p = NULL, *insert_parent = NULL;
1087         block_t end = lstart + len;
1088
1089         mutex_lock(&dcc->cmd_lock);
1090
1091         dc = (struct discard_cmd *)f2fs_lookup_rb_tree_ret(&dcc->root,
1092                                         NULL, lstart,
1093                                         (struct rb_entry **)&prev_dc,
1094                                         (struct rb_entry **)&next_dc,
1095                                         &insert_p, &insert_parent, true);
1096         if (dc)
1097                 prev_dc = dc;
1098
1099         if (!prev_dc) {
1100                 di.lstart = lstart;
1101                 di.len = next_dc ? next_dc->lstart - lstart : len;
1102                 di.len = min(di.len, len);
1103                 di.start = start;
1104         }
1105
1106         while (1) {
1107                 struct rb_node *node;
1108                 bool merged = false;
1109                 struct discard_cmd *tdc = NULL;
1110
1111                 if (prev_dc) {
1112                         di.lstart = prev_dc->lstart + prev_dc->len;
1113                         if (di.lstart < lstart)
1114                                 di.lstart = lstart;
1115                         if (di.lstart >= end)
1116                                 break;
1117
1118                         if (!next_dc || next_dc->lstart > end)
1119                                 di.len = end - di.lstart;
1120                         else
1121                                 di.len = next_dc->lstart - di.lstart;
1122                         di.start = start + di.lstart - lstart;
1123                 }
1124
1125                 if (!di.len)
1126                         goto next;
1127
1128                 if (prev_dc && prev_dc->state == D_PREP &&
1129                         prev_dc->bdev == bdev &&
1130                         __is_discard_back_mergeable(&di, &prev_dc->di)) {
1131                         prev_dc->di.len += di.len;
1132                         dcc->undiscard_blks += di.len;
1133                         __relocate_discard_cmd(dcc, prev_dc);
1134                         di = prev_dc->di;
1135                         tdc = prev_dc;
1136                         merged = true;
1137                 }
1138
1139                 if (next_dc && next_dc->state == D_PREP &&
1140                         next_dc->bdev == bdev &&
1141                         __is_discard_front_mergeable(&di, &next_dc->di)) {
1142                         next_dc->di.lstart = di.lstart;
1143                         next_dc->di.len += di.len;
1144                         next_dc->di.start = di.start;
1145                         dcc->undiscard_blks += di.len;
1146                         __relocate_discard_cmd(dcc, next_dc);
1147                         if (tdc)
1148                                 __remove_discard_cmd(sbi, tdc);
1149                         merged = true;
1150                 }
1151
1152                 if (!merged) {
1153                         __insert_discard_tree(sbi, bdev, di.lstart, di.start,
1154                                                         di.len, NULL, NULL);
1155                 }
1156  next:
1157                 prev_dc = next_dc;
1158                 if (!prev_dc)
1159                         break;
1160
1161                 node = rb_next(&prev_dc->rb_node);
1162                 next_dc = rb_entry_safe(node, struct discard_cmd, rb_node);
1163         }
1164
1165         mutex_unlock(&dcc->cmd_lock);
1166 }
1167
1168 static int __queue_discard_cmd(struct f2fs_sb_info *sbi,
1169                 struct block_device *bdev, block_t blkstart, block_t blklen)
1170 {
1171         block_t lblkstart = blkstart;
1172
1173         trace_f2fs_queue_discard(bdev, blkstart, blklen);
1174
1175         if (sbi->s_ndevs) {
1176                 int devi = f2fs_target_device_index(sbi, blkstart);
1177
1178                 blkstart -= FDEV(devi).start_blk;
1179         }
1180         __update_discard_tree_range(sbi, bdev, lblkstart, blkstart, blklen);
1181         return 0;
1182 }
1183
1184 static int __issue_discard_cmd(struct f2fs_sb_info *sbi,
1185                                         struct discard_policy *dpolicy)
1186 {
1187         struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
1188         struct list_head *pend_list;
1189         struct discard_cmd *dc, *tmp;
1190         struct blk_plug plug;
1191         int i, iter = 0, issued = 0;
1192         bool io_interrupted = false;
1193
1194         for (i = MAX_PLIST_NUM - 1; i >= 0; i--) {
1195                 if (i + 1 < dpolicy->granularity)
1196                         break;
1197                 pend_list = &dcc->pend_list[i];
1198
1199                 mutex_lock(&dcc->cmd_lock);
1200                 if (list_empty(pend_list))
1201                         goto next;
1202                 f2fs_bug_on(sbi,
1203                         !f2fs_check_rb_tree_consistence(sbi, &dcc->root));
1204                 blk_start_plug(&plug);
1205                 list_for_each_entry_safe(dc, tmp, pend_list, list) {
1206                         f2fs_bug_on(sbi, dc->state != D_PREP);
1207
1208                         if (dpolicy->io_aware && i < dpolicy->io_aware_gran &&
1209                                                                 !is_idle(sbi)) {
1210                                 io_interrupted = true;
1211                                 goto skip;
1212                         }
1213
1214                         __submit_discard_cmd(sbi, dpolicy, dc);
1215                         issued++;
1216 skip:
1217                         if (++iter >= dpolicy->max_requests)
1218                                 break;
1219                 }
1220                 blk_finish_plug(&plug);
1221 next:
1222                 mutex_unlock(&dcc->cmd_lock);
1223
1224                 if (iter >= dpolicy->max_requests)
1225                         break;
1226         }
1227
1228         if (!issued && io_interrupted)
1229                 issued = -1;
1230
1231         return issued;
1232 }
1233
1234 static bool __drop_discard_cmd(struct f2fs_sb_info *sbi)
1235 {
1236         struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
1237         struct list_head *pend_list;
1238         struct discard_cmd *dc, *tmp;
1239         int i;
1240         bool dropped = false;
1241
1242         mutex_lock(&dcc->cmd_lock);
1243         for (i = MAX_PLIST_NUM - 1; i >= 0; i--) {
1244                 pend_list = &dcc->pend_list[i];
1245                 list_for_each_entry_safe(dc, tmp, pend_list, list) {
1246                         f2fs_bug_on(sbi, dc->state != D_PREP);
1247                         __remove_discard_cmd(sbi, dc);
1248                         dropped = true;
1249                 }
1250         }
1251         mutex_unlock(&dcc->cmd_lock);
1252
1253         return dropped;
1254 }
1255
1256 void f2fs_drop_discard_cmd(struct f2fs_sb_info *sbi)
1257 {
1258         __drop_discard_cmd(sbi);
1259 }
1260
1261 static unsigned int __wait_one_discard_bio(struct f2fs_sb_info *sbi,
1262                                                         struct discard_cmd *dc)
1263 {
1264         struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
1265         unsigned int len = 0;
1266
1267         wait_for_completion_io(&dc->wait);
1268         mutex_lock(&dcc->cmd_lock);
1269         f2fs_bug_on(sbi, dc->state != D_DONE);
1270         dc->ref--;
1271         if (!dc->ref) {
1272                 if (!dc->error)
1273                         len = dc->len;
1274                 __remove_discard_cmd(sbi, dc);
1275         }
1276         mutex_unlock(&dcc->cmd_lock);
1277
1278         return len;
1279 }
1280
1281 static unsigned int __wait_discard_cmd_range(struct f2fs_sb_info *sbi,
1282                                                 struct discard_policy *dpolicy,
1283                                                 block_t start, block_t end)
1284 {
1285         struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
1286         struct list_head *wait_list = (dpolicy->type == DPOLICY_FSTRIM) ?
1287                                         &(dcc->fstrim_list) : &(dcc->wait_list);
1288         struct discard_cmd *dc, *tmp;
1289         bool need_wait;
1290         unsigned int trimmed = 0;
1291
1292 next:
1293         need_wait = false;
1294
1295         mutex_lock(&dcc->cmd_lock);
1296         list_for_each_entry_safe(dc, tmp, wait_list, list) {
1297                 if (dc->lstart + dc->len <= start || end <= dc->lstart)
1298                         continue;
1299                 if (dc->len < dpolicy->granularity)
1300                         continue;
1301                 if (dc->state == D_DONE && !dc->ref) {
1302                         wait_for_completion_io(&dc->wait);
1303                         if (!dc->error)
1304                                 trimmed += dc->len;
1305                         __remove_discard_cmd(sbi, dc);
1306                 } else {
1307                         dc->ref++;
1308                         need_wait = true;
1309                         break;
1310                 }
1311         }
1312         mutex_unlock(&dcc->cmd_lock);
1313
1314         if (need_wait) {
1315                 trimmed += __wait_one_discard_bio(sbi, dc);
1316                 goto next;
1317         }
1318
1319         return trimmed;
1320 }
1321
1322 static void __wait_all_discard_cmd(struct f2fs_sb_info *sbi,
1323                                                 struct discard_policy *dpolicy)
1324 {
1325         struct discard_policy dp;
1326
1327         if (dpolicy) {
1328                 __wait_discard_cmd_range(sbi, dpolicy, 0, UINT_MAX);
1329                 return;
1330         }
1331
1332         /* wait all */
1333         __init_discard_policy(sbi, &dp, DPOLICY_FSTRIM, 1);
1334         __wait_discard_cmd_range(sbi, &dp, 0, UINT_MAX);
1335         __init_discard_policy(sbi, &dp, DPOLICY_UMOUNT, 1);
1336         __wait_discard_cmd_range(sbi, &dp, 0, UINT_MAX);
1337 }
1338
1339 /* This should be covered by global mutex, &sit_i->sentry_lock */
1340 static void f2fs_wait_discard_bio(struct f2fs_sb_info *sbi, block_t blkaddr)
1341 {
1342         struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
1343         struct discard_cmd *dc;
1344         bool need_wait = false;
1345
1346         mutex_lock(&dcc->cmd_lock);
1347         dc = (struct discard_cmd *)f2fs_lookup_rb_tree(&dcc->root,
1348                                                         NULL, blkaddr);
1349         if (dc) {
1350                 if (dc->state == D_PREP) {
1351                         __punch_discard_cmd(sbi, dc, blkaddr);
1352                 } else {
1353                         dc->ref++;
1354                         need_wait = true;
1355                 }
1356         }
1357         mutex_unlock(&dcc->cmd_lock);
1358
1359         if (need_wait)
1360                 __wait_one_discard_bio(sbi, dc);
1361 }
1362
1363 void f2fs_stop_discard_thread(struct f2fs_sb_info *sbi)
1364 {
1365         struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
1366
1367         if (dcc && dcc->f2fs_issue_discard) {
1368                 struct task_struct *discard_thread = dcc->f2fs_issue_discard;
1369
1370                 dcc->f2fs_issue_discard = NULL;
1371                 kthread_stop(discard_thread);
1372         }
1373 }
1374
1375 /* This comes from f2fs_put_super */
1376 bool f2fs_wait_discard_bios(struct f2fs_sb_info *sbi)
1377 {
1378         struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
1379         struct discard_policy dpolicy;
1380         bool dropped;
1381
1382         __init_discard_policy(sbi, &dpolicy, DPOLICY_UMOUNT,
1383                                         dcc->discard_granularity);
1384         __issue_discard_cmd(sbi, &dpolicy);
1385         dropped = __drop_discard_cmd(sbi);
1386
1387         /* just to make sure there is no pending discard commands */
1388         __wait_all_discard_cmd(sbi, NULL);
1389         return dropped;
1390 }
1391
1392 static int issue_discard_thread(void *data)
1393 {
1394         struct f2fs_sb_info *sbi = data;
1395         struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
1396         wait_queue_head_t *q = &dcc->discard_wait_queue;
1397         struct discard_policy dpolicy;
1398         unsigned int wait_ms = DEF_MIN_DISCARD_ISSUE_TIME;
1399         int issued;
1400
1401         set_freezable();
1402
1403         do {
1404                 __init_discard_policy(sbi, &dpolicy, DPOLICY_BG,
1405                                         dcc->discard_granularity);
1406
1407                 wait_event_interruptible_timeout(*q,
1408                                 kthread_should_stop() || freezing(current) ||
1409                                 dcc->discard_wake,
1410                                 msecs_to_jiffies(wait_ms));
1411
1412                 if (dcc->discard_wake)
1413                         dcc->discard_wake = 0;
1414
1415                 if (try_to_freeze())
1416                         continue;
1417                 if (f2fs_readonly(sbi->sb))
1418                         continue;
1419                 if (kthread_should_stop())
1420                         return 0;
1421                 if (is_sbi_flag_set(sbi, SBI_NEED_FSCK)) {
1422                         wait_ms = dpolicy.max_interval;
1423                         continue;
1424                 }
1425
1426                 if (sbi->gc_mode == GC_URGENT)
1427                         __init_discard_policy(sbi, &dpolicy, DPOLICY_FORCE, 1);
1428
1429                 sb_start_intwrite(sbi->sb);
1430
1431                 issued = __issue_discard_cmd(sbi, &dpolicy);
1432                 if (issued > 0) {
1433                         __wait_all_discard_cmd(sbi, &dpolicy);
1434                         wait_ms = dpolicy.min_interval;
1435                 } else if (issued == -1){
1436                         wait_ms = dpolicy.mid_interval;
1437                 } else {
1438                         wait_ms = dpolicy.max_interval;
1439                 }
1440
1441                 sb_end_intwrite(sbi->sb);
1442
1443         } while (!kthread_should_stop());
1444         return 0;
1445 }
1446
1447 #ifdef CONFIG_BLK_DEV_ZONED
1448 static int __f2fs_issue_discard_zone(struct f2fs_sb_info *sbi,
1449                 struct block_device *bdev, block_t blkstart, block_t blklen)
1450 {
1451         sector_t sector, nr_sects;
1452         block_t lblkstart = blkstart;
1453         int devi = 0;
1454
1455         if (sbi->s_ndevs) {
1456                 devi = f2fs_target_device_index(sbi, blkstart);
1457                 blkstart -= FDEV(devi).start_blk;
1458         }
1459
1460         /*
1461          * We need to know the type of the zone: for conventional zones,
1462          * use regular discard if the drive supports it. For sequential
1463          * zones, reset the zone write pointer.
1464          */
1465         switch (get_blkz_type(sbi, bdev, blkstart)) {
1466
1467         case BLK_ZONE_TYPE_CONVENTIONAL:
1468                 if (!blk_queue_discard(bdev_get_queue(bdev)))
1469                         return 0;
1470                 return __queue_discard_cmd(sbi, bdev, lblkstart, blklen);
1471         case BLK_ZONE_TYPE_SEQWRITE_REQ:
1472         case BLK_ZONE_TYPE_SEQWRITE_PREF:
1473                 sector = SECTOR_FROM_BLOCK(blkstart);
1474                 nr_sects = SECTOR_FROM_BLOCK(blklen);
1475
1476                 if (sector & (bdev_zone_sectors(bdev) - 1) ||
1477                                 nr_sects != bdev_zone_sectors(bdev)) {
1478                         f2fs_msg(sbi->sb, KERN_INFO,
1479                                 "(%d) %s: Unaligned discard attempted (block %x + %x)",
1480                                 devi, sbi->s_ndevs ? FDEV(devi).path: "",
1481                                 blkstart, blklen);
1482                         return -EIO;
1483                 }
1484                 trace_f2fs_issue_reset_zone(bdev, blkstart);
1485                 return blkdev_reset_zones(bdev, sector,
1486                                           nr_sects, GFP_NOFS);
1487         default:
1488                 /* Unknown zone type: broken device ? */
1489                 return -EIO;
1490         }
1491 }
1492 #endif
1493
1494 static int __issue_discard_async(struct f2fs_sb_info *sbi,
1495                 struct block_device *bdev, block_t blkstart, block_t blklen)
1496 {
1497 #ifdef CONFIG_BLK_DEV_ZONED
1498         if (f2fs_sb_has_blkzoned(sbi->sb) &&
1499                                 bdev_zoned_model(bdev) != BLK_ZONED_NONE)
1500                 return __f2fs_issue_discard_zone(sbi, bdev, blkstart, blklen);
1501 #endif
1502         return __queue_discard_cmd(sbi, bdev, blkstart, blklen);
1503 }
1504
1505 static int f2fs_issue_discard(struct f2fs_sb_info *sbi,
1506                                 block_t blkstart, block_t blklen)
1507 {
1508         sector_t start = blkstart, len = 0;
1509         struct block_device *bdev;
1510         struct seg_entry *se;
1511         unsigned int offset;
1512         block_t i;
1513         int err = 0;
1514
1515         bdev = f2fs_target_device(sbi, blkstart, NULL);
1516
1517         for (i = blkstart; i < blkstart + blklen; i++, len++) {
1518                 if (i != start) {
1519                         struct block_device *bdev2 =
1520                                 f2fs_target_device(sbi, i, NULL);
1521
1522                         if (bdev2 != bdev) {
1523                                 err = __issue_discard_async(sbi, bdev,
1524                                                 start, len);
1525                                 if (err)
1526                                         return err;
1527                                 bdev = bdev2;
1528                                 start = i;
1529                                 len = 0;
1530                         }
1531                 }
1532
1533                 se = get_seg_entry(sbi, GET_SEGNO(sbi, i));
1534                 offset = GET_BLKOFF_FROM_SEG0(sbi, i);
1535
1536                 if (!f2fs_test_and_set_bit(offset, se->discard_map))
1537                         sbi->discard_blks--;
1538         }
1539
1540         if (len)
1541                 err = __issue_discard_async(sbi, bdev, start, len);
1542         return err;
1543 }
1544
1545 static bool add_discard_addrs(struct f2fs_sb_info *sbi, struct cp_control *cpc,
1546                                                         bool check_only)
1547 {
1548         int entries = SIT_VBLOCK_MAP_SIZE / sizeof(unsigned long);
1549         int max_blocks = sbi->blocks_per_seg;
1550         struct seg_entry *se = get_seg_entry(sbi, cpc->trim_start);
1551         unsigned long *cur_map = (unsigned long *)se->cur_valid_map;
1552         unsigned long *ckpt_map = (unsigned long *)se->ckpt_valid_map;
1553         unsigned long *discard_map = (unsigned long *)se->discard_map;
1554         unsigned long *dmap = SIT_I(sbi)->tmp_map;
1555         unsigned int start = 0, end = -1;
1556         bool force = (cpc->reason & CP_DISCARD);
1557         struct discard_entry *de = NULL;
1558         struct list_head *head = &SM_I(sbi)->dcc_info->entry_list;
1559         int i;
1560
1561         if (se->valid_blocks == max_blocks || !f2fs_discard_en(sbi))
1562                 return false;
1563
1564         if (!force) {
1565                 if (!test_opt(sbi, DISCARD) || !se->valid_blocks ||
1566                         SM_I(sbi)->dcc_info->nr_discards >=
1567                                 SM_I(sbi)->dcc_info->max_discards)
1568                         return false;
1569         }
1570
1571         /* SIT_VBLOCK_MAP_SIZE should be multiple of sizeof(unsigned long) */
1572         for (i = 0; i < entries; i++)
1573                 dmap[i] = force ? ~ckpt_map[i] & ~discard_map[i] :
1574                                 (cur_map[i] ^ ckpt_map[i]) & ckpt_map[i];
1575
1576         while (force || SM_I(sbi)->dcc_info->nr_discards <=
1577                                 SM_I(sbi)->dcc_info->max_discards) {
1578                 start = __find_rev_next_bit(dmap, max_blocks, end + 1);
1579                 if (start >= max_blocks)
1580                         break;
1581
1582                 end = __find_rev_next_zero_bit(dmap, max_blocks, start + 1);
1583                 if (force && start && end != max_blocks
1584                                         && (end - start) < cpc->trim_minlen)
1585                         continue;
1586
1587                 if (check_only)
1588                         return true;
1589
1590                 if (!de) {
1591                         de = f2fs_kmem_cache_alloc(discard_entry_slab,
1592                                                                 GFP_F2FS_ZERO);
1593                         de->start_blkaddr = START_BLOCK(sbi, cpc->trim_start);
1594                         list_add_tail(&de->list, head);
1595                 }
1596
1597                 for (i = start; i < end; i++)
1598                         __set_bit_le(i, (void *)de->discard_map);
1599
1600                 SM_I(sbi)->dcc_info->nr_discards += end - start;
1601         }
1602         return false;
1603 }
1604
1605 static void release_discard_addr(struct discard_entry *entry)
1606 {
1607         list_del(&entry->list);
1608         kmem_cache_free(discard_entry_slab, entry);
1609 }
1610
1611 void f2fs_release_discard_addrs(struct f2fs_sb_info *sbi)
1612 {
1613         struct list_head *head = &(SM_I(sbi)->dcc_info->entry_list);
1614         struct discard_entry *entry, *this;
1615
1616         /* drop caches */
1617         list_for_each_entry_safe(entry, this, head, list)
1618                 release_discard_addr(entry);
1619 }
1620
1621 /*
1622  * Should call f2fs_clear_prefree_segments after checkpoint is done.
1623  */
1624 static void set_prefree_as_free_segments(struct f2fs_sb_info *sbi)
1625 {
1626         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
1627         unsigned int segno;
1628
1629         mutex_lock(&dirty_i->seglist_lock);
1630         for_each_set_bit(segno, dirty_i->dirty_segmap[PRE], MAIN_SEGS(sbi))
1631                 __set_test_and_free(sbi, segno);
1632         mutex_unlock(&dirty_i->seglist_lock);
1633 }
1634
1635 void f2fs_clear_prefree_segments(struct f2fs_sb_info *sbi,
1636                                                 struct cp_control *cpc)
1637 {
1638         struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
1639         struct list_head *head = &dcc->entry_list;
1640         struct discard_entry *entry, *this;
1641         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
1642         unsigned long *prefree_map = dirty_i->dirty_segmap[PRE];
1643         unsigned int start = 0, end = -1;
1644         unsigned int secno, start_segno;
1645         bool force = (cpc->reason & CP_DISCARD);
1646
1647         mutex_lock(&dirty_i->seglist_lock);
1648
1649         while (1) {
1650                 int i;
1651                 start = find_next_bit(prefree_map, MAIN_SEGS(sbi), end + 1);
1652                 if (start >= MAIN_SEGS(sbi))
1653                         break;
1654                 end = find_next_zero_bit(prefree_map, MAIN_SEGS(sbi),
1655                                                                 start + 1);
1656
1657                 for (i = start; i < end; i++)
1658                         clear_bit(i, prefree_map);
1659
1660                 dirty_i->nr_dirty[PRE] -= end - start;
1661
1662                 if (!test_opt(sbi, DISCARD))
1663                         continue;
1664
1665                 if (force && start >= cpc->trim_start &&
1666                                         (end - 1) <= cpc->trim_end)
1667                                 continue;
1668
1669                 if (!test_opt(sbi, LFS) || sbi->segs_per_sec == 1) {
1670                         f2fs_issue_discard(sbi, START_BLOCK(sbi, start),
1671                                 (end - start) << sbi->log_blocks_per_seg);
1672                         continue;
1673                 }
1674 next:
1675                 secno = GET_SEC_FROM_SEG(sbi, start);
1676                 start_segno = GET_SEG_FROM_SEC(sbi, secno);
1677                 if (!IS_CURSEC(sbi, secno) &&
1678                         !get_valid_blocks(sbi, start, true))
1679                         f2fs_issue_discard(sbi, START_BLOCK(sbi, start_segno),
1680                                 sbi->segs_per_sec << sbi->log_blocks_per_seg);
1681
1682                 start = start_segno + sbi->segs_per_sec;
1683                 if (start < end)
1684                         goto next;
1685                 else
1686                         end = start - 1;
1687         }
1688         mutex_unlock(&dirty_i->seglist_lock);
1689
1690         /* send small discards */
1691         list_for_each_entry_safe(entry, this, head, list) {
1692                 unsigned int cur_pos = 0, next_pos, len, total_len = 0;
1693                 bool is_valid = test_bit_le(0, entry->discard_map);
1694
1695 find_next:
1696                 if (is_valid) {
1697                         next_pos = find_next_zero_bit_le(entry->discard_map,
1698                                         sbi->blocks_per_seg, cur_pos);
1699                         len = next_pos - cur_pos;
1700
1701                         if (f2fs_sb_has_blkzoned(sbi->sb) ||
1702                             (force && len < cpc->trim_minlen))
1703                                 goto skip;
1704
1705                         f2fs_issue_discard(sbi, entry->start_blkaddr + cur_pos,
1706                                                                         len);
1707                         total_len += len;
1708                 } else {
1709                         next_pos = find_next_bit_le(entry->discard_map,
1710                                         sbi->blocks_per_seg, cur_pos);
1711                 }
1712 skip:
1713                 cur_pos = next_pos;
1714                 is_valid = !is_valid;
1715
1716                 if (cur_pos < sbi->blocks_per_seg)
1717                         goto find_next;
1718
1719                 release_discard_addr(entry);
1720                 dcc->nr_discards -= total_len;
1721         }
1722
1723         wake_up_discard_thread(sbi, false);
1724 }
1725
1726 static int create_discard_cmd_control(struct f2fs_sb_info *sbi)
1727 {
1728         dev_t dev = sbi->sb->s_bdev->bd_dev;
1729         struct discard_cmd_control *dcc;
1730         int err = 0, i;
1731
1732         if (SM_I(sbi)->dcc_info) {
1733                 dcc = SM_I(sbi)->dcc_info;
1734                 goto init_thread;
1735         }
1736
1737         dcc = f2fs_kzalloc(sbi, sizeof(struct discard_cmd_control), GFP_KERNEL);
1738         if (!dcc)
1739                 return -ENOMEM;
1740
1741         dcc->discard_granularity = DEFAULT_DISCARD_GRANULARITY;
1742         INIT_LIST_HEAD(&dcc->entry_list);
1743         for (i = 0; i < MAX_PLIST_NUM; i++)
1744                 INIT_LIST_HEAD(&dcc->pend_list[i]);
1745         INIT_LIST_HEAD(&dcc->wait_list);
1746         INIT_LIST_HEAD(&dcc->fstrim_list);
1747         mutex_init(&dcc->cmd_lock);
1748         atomic_set(&dcc->issued_discard, 0);
1749         atomic_set(&dcc->issing_discard, 0);
1750         atomic_set(&dcc->discard_cmd_cnt, 0);
1751         dcc->nr_discards = 0;
1752         dcc->max_discards = MAIN_SEGS(sbi) << sbi->log_blocks_per_seg;
1753         dcc->undiscard_blks = 0;
1754         dcc->root = RB_ROOT;
1755
1756         init_waitqueue_head(&dcc->discard_wait_queue);
1757         SM_I(sbi)->dcc_info = dcc;
1758 init_thread:
1759         dcc->f2fs_issue_discard = kthread_run(issue_discard_thread, sbi,
1760                                 "f2fs_discard-%u:%u", MAJOR(dev), MINOR(dev));
1761         if (IS_ERR(dcc->f2fs_issue_discard)) {
1762                 err = PTR_ERR(dcc->f2fs_issue_discard);
1763                 kfree(dcc);
1764                 SM_I(sbi)->dcc_info = NULL;
1765                 return err;
1766         }
1767
1768         return err;
1769 }
1770
1771 static void destroy_discard_cmd_control(struct f2fs_sb_info *sbi)
1772 {
1773         struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
1774
1775         if (!dcc)
1776                 return;
1777
1778         f2fs_stop_discard_thread(sbi);
1779
1780         kfree(dcc);
1781         SM_I(sbi)->dcc_info = NULL;
1782 }
1783
1784 static bool __mark_sit_entry_dirty(struct f2fs_sb_info *sbi, unsigned int segno)
1785 {
1786         struct sit_info *sit_i = SIT_I(sbi);
1787
1788         if (!__test_and_set_bit(segno, sit_i->dirty_sentries_bitmap)) {
1789                 sit_i->dirty_sentries++;
1790                 return false;
1791         }
1792
1793         return true;
1794 }
1795
1796 static void __set_sit_entry_type(struct f2fs_sb_info *sbi, int type,
1797                                         unsigned int segno, int modified)
1798 {
1799         struct seg_entry *se = get_seg_entry(sbi, segno);
1800         se->type = type;
1801         if (modified)
1802                 __mark_sit_entry_dirty(sbi, segno);
1803 }
1804
1805 static void update_sit_entry(struct f2fs_sb_info *sbi, block_t blkaddr, int del)
1806 {
1807         struct seg_entry *se;
1808         unsigned int segno, offset;
1809         long int new_vblocks;
1810         bool exist;
1811 #ifdef CONFIG_F2FS_CHECK_FS
1812         bool mir_exist;
1813 #endif
1814
1815         segno = GET_SEGNO(sbi, blkaddr);
1816
1817         se = get_seg_entry(sbi, segno);
1818         new_vblocks = se->valid_blocks + del;
1819         offset = GET_BLKOFF_FROM_SEG0(sbi, blkaddr);
1820
1821         f2fs_bug_on(sbi, (new_vblocks >> (sizeof(unsigned short) << 3) ||
1822                                 (new_vblocks > sbi->blocks_per_seg)));
1823
1824         se->valid_blocks = new_vblocks;
1825         se->mtime = get_mtime(sbi, false);
1826         if (se->mtime > SIT_I(sbi)->max_mtime)
1827                 SIT_I(sbi)->max_mtime = se->mtime;
1828
1829         /* Update valid block bitmap */
1830         if (del > 0) {
1831                 exist = f2fs_test_and_set_bit(offset, se->cur_valid_map);
1832 #ifdef CONFIG_F2FS_CHECK_FS
1833                 mir_exist = f2fs_test_and_set_bit(offset,
1834                                                 se->cur_valid_map_mir);
1835                 if (unlikely(exist != mir_exist)) {
1836                         f2fs_msg(sbi->sb, KERN_ERR, "Inconsistent error "
1837                                 "when setting bitmap, blk:%u, old bit:%d",
1838                                 blkaddr, exist);
1839                         f2fs_bug_on(sbi, 1);
1840                 }
1841 #endif
1842                 if (unlikely(exist)) {
1843                         f2fs_msg(sbi->sb, KERN_ERR,
1844                                 "Bitmap was wrongly set, blk:%u", blkaddr);
1845                         f2fs_bug_on(sbi, 1);
1846                         se->valid_blocks--;
1847                         del = 0;
1848                 }
1849
1850                 if (f2fs_discard_en(sbi) &&
1851                         !f2fs_test_and_set_bit(offset, se->discard_map))
1852                         sbi->discard_blks--;
1853
1854                 /* don't overwrite by SSR to keep node chain */
1855                 if (IS_NODESEG(se->type)) {
1856                         if (!f2fs_test_and_set_bit(offset, se->ckpt_valid_map))
1857                                 se->ckpt_valid_blocks++;
1858                 }
1859         } else {
1860                 exist = f2fs_test_and_clear_bit(offset, se->cur_valid_map);
1861 #ifdef CONFIG_F2FS_CHECK_FS
1862                 mir_exist = f2fs_test_and_clear_bit(offset,
1863                                                 se->cur_valid_map_mir);
1864                 if (unlikely(exist != mir_exist)) {
1865                         f2fs_msg(sbi->sb, KERN_ERR, "Inconsistent error "
1866                                 "when clearing bitmap, blk:%u, old bit:%d",
1867                                 blkaddr, exist);
1868                         f2fs_bug_on(sbi, 1);
1869                 }
1870 #endif
1871                 if (unlikely(!exist)) {
1872                         f2fs_msg(sbi->sb, KERN_ERR,
1873                                 "Bitmap was wrongly cleared, blk:%u", blkaddr);
1874                         f2fs_bug_on(sbi, 1);
1875                         se->valid_blocks++;
1876                         del = 0;
1877                 }
1878
1879                 if (f2fs_discard_en(sbi) &&
1880                         f2fs_test_and_clear_bit(offset, se->discard_map))
1881                         sbi->discard_blks++;
1882         }
1883         if (!f2fs_test_bit(offset, se->ckpt_valid_map))
1884                 se->ckpt_valid_blocks += del;
1885
1886         __mark_sit_entry_dirty(sbi, segno);
1887
1888         /* update total number of valid blocks to be written in ckpt area */
1889         SIT_I(sbi)->written_valid_blocks += del;
1890
1891         if (sbi->segs_per_sec > 1)
1892                 get_sec_entry(sbi, segno)->valid_blocks += del;
1893 }
1894
1895 void f2fs_invalidate_blocks(struct f2fs_sb_info *sbi, block_t addr)
1896 {
1897         unsigned int segno = GET_SEGNO(sbi, addr);
1898         struct sit_info *sit_i = SIT_I(sbi);
1899
1900         f2fs_bug_on(sbi, addr == NULL_ADDR);
1901         if (addr == NEW_ADDR)
1902                 return;
1903
1904         /* add it into sit main buffer */
1905         down_write(&sit_i->sentry_lock);
1906
1907         update_sit_entry(sbi, addr, -1);
1908
1909         /* add it into dirty seglist */
1910         locate_dirty_segment(sbi, segno);
1911
1912         up_write(&sit_i->sentry_lock);
1913 }
1914
1915 bool f2fs_is_checkpointed_data(struct f2fs_sb_info *sbi, block_t blkaddr)
1916 {
1917         struct sit_info *sit_i = SIT_I(sbi);
1918         unsigned int segno, offset;
1919         struct seg_entry *se;
1920         bool is_cp = false;
1921
1922         if (!is_valid_blkaddr(blkaddr))
1923                 return true;
1924
1925         down_read(&sit_i->sentry_lock);
1926
1927         segno = GET_SEGNO(sbi, blkaddr);
1928         se = get_seg_entry(sbi, segno);
1929         offset = GET_BLKOFF_FROM_SEG0(sbi, blkaddr);
1930
1931         if (f2fs_test_bit(offset, se->ckpt_valid_map))
1932                 is_cp = true;
1933
1934         up_read(&sit_i->sentry_lock);
1935
1936         return is_cp;
1937 }
1938
1939 /*
1940  * This function should be resided under the curseg_mutex lock
1941  */
1942 static void __add_sum_entry(struct f2fs_sb_info *sbi, int type,
1943                                         struct f2fs_summary *sum)
1944 {
1945         struct curseg_info *curseg = CURSEG_I(sbi, type);
1946         void *addr = curseg->sum_blk;
1947         addr += curseg->next_blkoff * sizeof(struct f2fs_summary);
1948         memcpy(addr, sum, sizeof(struct f2fs_summary));
1949 }
1950
1951 /*
1952  * Calculate the number of current summary pages for writing
1953  */
1954 int f2fs_npages_for_summary_flush(struct f2fs_sb_info *sbi, bool for_ra)
1955 {
1956         int valid_sum_count = 0;
1957         int i, sum_in_page;
1958
1959         for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++) {
1960                 if (sbi->ckpt->alloc_type[i] == SSR)
1961                         valid_sum_count += sbi->blocks_per_seg;
1962                 else {
1963                         if (for_ra)
1964                                 valid_sum_count += le16_to_cpu(
1965                                         F2FS_CKPT(sbi)->cur_data_blkoff[i]);
1966                         else
1967                                 valid_sum_count += curseg_blkoff(sbi, i);
1968                 }
1969         }
1970
1971         sum_in_page = (PAGE_SIZE - 2 * SUM_JOURNAL_SIZE -
1972                         SUM_FOOTER_SIZE) / SUMMARY_SIZE;
1973         if (valid_sum_count <= sum_in_page)
1974                 return 1;
1975         else if ((valid_sum_count - sum_in_page) <=
1976                 (PAGE_SIZE - SUM_FOOTER_SIZE) / SUMMARY_SIZE)
1977                 return 2;
1978         return 3;
1979 }
1980
1981 /*
1982  * Caller should put this summary page
1983  */
1984 struct page *f2fs_get_sum_page(struct f2fs_sb_info *sbi, unsigned int segno)
1985 {
1986         return f2fs_get_meta_page(sbi, GET_SUM_BLOCK(sbi, segno));
1987 }
1988
1989 void f2fs_update_meta_page(struct f2fs_sb_info *sbi,
1990                                         void *src, block_t blk_addr)
1991 {
1992         struct page *page = f2fs_grab_meta_page(sbi, blk_addr);
1993
1994         memcpy(page_address(page), src, PAGE_SIZE);
1995         set_page_dirty(page);
1996         f2fs_put_page(page, 1);
1997 }
1998
1999 static void write_sum_page(struct f2fs_sb_info *sbi,
2000                         struct f2fs_summary_block *sum_blk, block_t blk_addr)
2001 {
2002         f2fs_update_meta_page(sbi, (void *)sum_blk, blk_addr);
2003 }
2004
2005 static void write_current_sum_page(struct f2fs_sb_info *sbi,
2006                                                 int type, block_t blk_addr)
2007 {
2008         struct curseg_info *curseg = CURSEG_I(sbi, type);
2009         struct page *page = f2fs_grab_meta_page(sbi, blk_addr);
2010         struct f2fs_summary_block *src = curseg->sum_blk;
2011         struct f2fs_summary_block *dst;
2012
2013         dst = (struct f2fs_summary_block *)page_address(page);
2014         memset(dst, 0, PAGE_SIZE);
2015
2016         mutex_lock(&curseg->curseg_mutex);
2017
2018         down_read(&curseg->journal_rwsem);
2019         memcpy(&dst->journal, curseg->journal, SUM_JOURNAL_SIZE);
2020         up_read(&curseg->journal_rwsem);
2021
2022         memcpy(dst->entries, src->entries, SUM_ENTRY_SIZE);
2023         memcpy(&dst->footer, &src->footer, SUM_FOOTER_SIZE);
2024
2025         mutex_unlock(&curseg->curseg_mutex);
2026
2027         set_page_dirty(page);
2028         f2fs_put_page(page, 1);
2029 }
2030
2031 static int is_next_segment_free(struct f2fs_sb_info *sbi, int type)
2032 {
2033         struct curseg_info *curseg = CURSEG_I(sbi, type);
2034         unsigned int segno = curseg->segno + 1;
2035         struct free_segmap_info *free_i = FREE_I(sbi);
2036
2037         if (segno < MAIN_SEGS(sbi) && segno % sbi->segs_per_sec)
2038                 return !test_bit(segno, free_i->free_segmap);
2039         return 0;
2040 }
2041
2042 /*
2043  * Find a new segment from the free segments bitmap to right order
2044  * This function should be returned with success, otherwise BUG
2045  */
2046 static void get_new_segment(struct f2fs_sb_info *sbi,
2047                         unsigned int *newseg, bool new_sec, int dir)
2048 {
2049         struct free_segmap_info *free_i = FREE_I(sbi);
2050         unsigned int segno, secno, zoneno;
2051         unsigned int total_zones = MAIN_SECS(sbi) / sbi->secs_per_zone;
2052         unsigned int hint = GET_SEC_FROM_SEG(sbi, *newseg);
2053         unsigned int old_zoneno = GET_ZONE_FROM_SEG(sbi, *newseg);
2054         unsigned int left_start = hint;
2055         bool init = true;
2056         int go_left = 0;
2057         int i;
2058
2059         spin_lock(&free_i->segmap_lock);
2060
2061         if (!new_sec && ((*newseg + 1) % sbi->segs_per_sec)) {
2062                 segno = find_next_zero_bit(free_i->free_segmap,
2063                         GET_SEG_FROM_SEC(sbi, hint + 1), *newseg + 1);
2064                 if (segno < GET_SEG_FROM_SEC(sbi, hint + 1))
2065                         goto got_it;
2066         }
2067 find_other_zone:
2068         secno = find_next_zero_bit(free_i->free_secmap, MAIN_SECS(sbi), hint);
2069         if (secno >= MAIN_SECS(sbi)) {
2070                 if (dir == ALLOC_RIGHT) {
2071                         secno = find_next_zero_bit(free_i->free_secmap,
2072                                                         MAIN_SECS(sbi), 0);
2073                         f2fs_bug_on(sbi, secno >= MAIN_SECS(sbi));
2074                 } else {
2075                         go_left = 1;
2076                         left_start = hint - 1;
2077                 }
2078         }
2079         if (go_left == 0)
2080                 goto skip_left;
2081
2082         while (test_bit(left_start, free_i->free_secmap)) {
2083                 if (left_start > 0) {
2084                         left_start--;
2085                         continue;
2086                 }
2087                 left_start = find_next_zero_bit(free_i->free_secmap,
2088                                                         MAIN_SECS(sbi), 0);
2089                 f2fs_bug_on(sbi, left_start >= MAIN_SECS(sbi));
2090                 break;
2091         }
2092         secno = left_start;
2093 skip_left:
2094         segno = GET_SEG_FROM_SEC(sbi, secno);
2095         zoneno = GET_ZONE_FROM_SEC(sbi, secno);
2096
2097         /* give up on finding another zone */
2098         if (!init)
2099                 goto got_it;
2100         if (sbi->secs_per_zone == 1)
2101                 goto got_it;
2102         if (zoneno == old_zoneno)
2103                 goto got_it;
2104         if (dir == ALLOC_LEFT) {
2105                 if (!go_left && zoneno + 1 >= total_zones)
2106                         goto got_it;
2107                 if (go_left && zoneno == 0)
2108                         goto got_it;
2109         }
2110         for (i = 0; i < NR_CURSEG_TYPE; i++)
2111                 if (CURSEG_I(sbi, i)->zone == zoneno)
2112                         break;
2113
2114         if (i < NR_CURSEG_TYPE) {
2115                 /* zone is in user, try another */
2116                 if (go_left)
2117                         hint = zoneno * sbi->secs_per_zone - 1;
2118                 else if (zoneno + 1 >= total_zones)
2119                         hint = 0;
2120                 else
2121                         hint = (zoneno + 1) * sbi->secs_per_zone;
2122                 init = false;
2123                 goto find_other_zone;
2124         }
2125 got_it:
2126         /* set it as dirty segment in free segmap */
2127         f2fs_bug_on(sbi, test_bit(segno, free_i->free_segmap));
2128         __set_inuse(sbi, segno);
2129         *newseg = segno;
2130         spin_unlock(&free_i->segmap_lock);
2131 }
2132
2133 static void reset_curseg(struct f2fs_sb_info *sbi, int type, int modified)
2134 {
2135         struct curseg_info *curseg = CURSEG_I(sbi, type);
2136         struct summary_footer *sum_footer;
2137
2138         curseg->segno = curseg->next_segno;
2139         curseg->zone = GET_ZONE_FROM_SEG(sbi, curseg->segno);
2140         curseg->next_blkoff = 0;
2141         curseg->next_segno = NULL_SEGNO;
2142
2143         sum_footer = &(curseg->sum_blk->footer);
2144         memset(sum_footer, 0, sizeof(struct summary_footer));
2145         if (IS_DATASEG(type))
2146                 SET_SUM_TYPE(sum_footer, SUM_TYPE_DATA);
2147         if (IS_NODESEG(type))
2148                 SET_SUM_TYPE(sum_footer, SUM_TYPE_NODE);
2149         __set_sit_entry_type(sbi, type, curseg->segno, modified);
2150 }
2151
2152 static unsigned int __get_next_segno(struct f2fs_sb_info *sbi, int type)
2153 {
2154         /* if segs_per_sec is large than 1, we need to keep original policy. */
2155         if (sbi->segs_per_sec != 1)
2156                 return CURSEG_I(sbi, type)->segno;
2157
2158         if (test_opt(sbi, NOHEAP) &&
2159                 (type == CURSEG_HOT_DATA || IS_NODESEG(type)))
2160                 return 0;
2161
2162         if (SIT_I(sbi)->last_victim[ALLOC_NEXT])
2163                 return SIT_I(sbi)->last_victim[ALLOC_NEXT];
2164
2165         /* find segments from 0 to reuse freed segments */
2166         if (F2FS_OPTION(sbi).alloc_mode == ALLOC_MODE_REUSE)
2167                 return 0;
2168
2169         return CURSEG_I(sbi, type)->segno;
2170 }
2171
2172 /*
2173  * Allocate a current working segment.
2174  * This function always allocates a free segment in LFS manner.
2175  */
2176 static void new_curseg(struct f2fs_sb_info *sbi, int type, bool new_sec)
2177 {
2178         struct curseg_info *curseg = CURSEG_I(sbi, type);
2179         unsigned int segno = curseg->segno;
2180         int dir = ALLOC_LEFT;
2181
2182         write_sum_page(sbi, curseg->sum_blk,
2183                                 GET_SUM_BLOCK(sbi, segno));
2184         if (type == CURSEG_WARM_DATA || type == CURSEG_COLD_DATA)
2185                 dir = ALLOC_RIGHT;
2186
2187         if (test_opt(sbi, NOHEAP))
2188                 dir = ALLOC_RIGHT;
2189
2190         segno = __get_next_segno(sbi, type);
2191         get_new_segment(sbi, &segno, new_sec, dir);
2192         curseg->next_segno = segno;
2193         reset_curseg(sbi, type, 1);
2194         curseg->alloc_type = LFS;
2195 }
2196
2197 static void __next_free_blkoff(struct f2fs_sb_info *sbi,
2198                         struct curseg_info *seg, block_t start)
2199 {
2200         struct seg_entry *se = get_seg_entry(sbi, seg->segno);
2201         int entries = SIT_VBLOCK_MAP_SIZE / sizeof(unsigned long);
2202         unsigned long *target_map = SIT_I(sbi)->tmp_map;
2203         unsigned long *ckpt_map = (unsigned long *)se->ckpt_valid_map;
2204         unsigned long *cur_map = (unsigned long *)se->cur_valid_map;
2205         int i, pos;
2206
2207         for (i = 0; i < entries; i++)
2208                 target_map[i] = ckpt_map[i] | cur_map[i];
2209
2210         pos = __find_rev_next_zero_bit(target_map, sbi->blocks_per_seg, start);
2211
2212         seg->next_blkoff = pos;
2213 }
2214
2215 /*
2216  * If a segment is written by LFS manner, next block offset is just obtained
2217  * by increasing the current block offset. However, if a segment is written by
2218  * SSR manner, next block offset obtained by calling __next_free_blkoff
2219  */
2220 static void __refresh_next_blkoff(struct f2fs_sb_info *sbi,
2221                                 struct curseg_info *seg)
2222 {
2223         if (seg->alloc_type == SSR)
2224                 __next_free_blkoff(sbi, seg, seg->next_blkoff + 1);
2225         else
2226                 seg->next_blkoff++;
2227 }
2228
2229 /*
2230  * This function always allocates a used segment(from dirty seglist) by SSR
2231  * manner, so it should recover the existing segment information of valid blocks
2232  */
2233 static void change_curseg(struct f2fs_sb_info *sbi, int type)
2234 {
2235         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
2236         struct curseg_info *curseg = CURSEG_I(sbi, type);
2237         unsigned int new_segno = curseg->next_segno;
2238         struct f2fs_summary_block *sum_node;
2239         struct page *sum_page;
2240
2241         write_sum_page(sbi, curseg->sum_blk,
2242                                 GET_SUM_BLOCK(sbi, curseg->segno));
2243         __set_test_and_inuse(sbi, new_segno);
2244
2245         mutex_lock(&dirty_i->seglist_lock);
2246         __remove_dirty_segment(sbi, new_segno, PRE);
2247         __remove_dirty_segment(sbi, new_segno, DIRTY);
2248         mutex_unlock(&dirty_i->seglist_lock);
2249
2250         reset_curseg(sbi, type, 1);
2251         curseg->alloc_type = SSR;
2252         __next_free_blkoff(sbi, curseg, 0);
2253
2254         sum_page = f2fs_get_sum_page(sbi, new_segno);
2255         sum_node = (struct f2fs_summary_block *)page_address(sum_page);
2256         memcpy(curseg->sum_blk, sum_node, SUM_ENTRY_SIZE);
2257         f2fs_put_page(sum_page, 1);
2258 }
2259
2260 static int get_ssr_segment(struct f2fs_sb_info *sbi, int type)
2261 {
2262         struct curseg_info *curseg = CURSEG_I(sbi, type);
2263         const struct victim_selection *v_ops = DIRTY_I(sbi)->v_ops;
2264         unsigned segno = NULL_SEGNO;
2265         int i, cnt;
2266         bool reversed = false;
2267
2268         /* f2fs_need_SSR() already forces to do this */
2269         if (v_ops->get_victim(sbi, &segno, BG_GC, type, SSR)) {
2270                 curseg->next_segno = segno;
2271                 return 1;
2272         }
2273
2274         /* For node segments, let's do SSR more intensively */
2275         if (IS_NODESEG(type)) {
2276                 if (type >= CURSEG_WARM_NODE) {
2277                         reversed = true;
2278                         i = CURSEG_COLD_NODE;
2279                 } else {
2280                         i = CURSEG_HOT_NODE;
2281                 }
2282                 cnt = NR_CURSEG_NODE_TYPE;
2283         } else {
2284                 if (type >= CURSEG_WARM_DATA) {
2285                         reversed = true;
2286                         i = CURSEG_COLD_DATA;
2287                 } else {
2288                         i = CURSEG_HOT_DATA;
2289                 }
2290                 cnt = NR_CURSEG_DATA_TYPE;
2291         }
2292
2293         for (; cnt-- > 0; reversed ? i-- : i++) {
2294                 if (i == type)
2295                         continue;
2296                 if (v_ops->get_victim(sbi, &segno, BG_GC, i, SSR)) {
2297                         curseg->next_segno = segno;
2298                         return 1;
2299                 }
2300         }
2301         return 0;
2302 }
2303
2304 /*
2305  * flush out current segment and replace it with new segment
2306  * This function should be returned with success, otherwise BUG
2307  */
2308 static void allocate_segment_by_default(struct f2fs_sb_info *sbi,
2309                                                 int type, bool force)
2310 {
2311         struct curseg_info *curseg = CURSEG_I(sbi, type);
2312
2313         if (force)
2314                 new_curseg(sbi, type, true);
2315         else if (!is_set_ckpt_flags(sbi, CP_CRC_RECOVERY_FLAG) &&
2316                                         type == CURSEG_WARM_NODE)
2317                 new_curseg(sbi, type, false);
2318         else if (curseg->alloc_type == LFS && is_next_segment_free(sbi, type))
2319                 new_curseg(sbi, type, false);
2320         else if (f2fs_need_SSR(sbi) && get_ssr_segment(sbi, type))
2321                 change_curseg(sbi, type);
2322         else
2323                 new_curseg(sbi, type, false);
2324
2325         stat_inc_seg_type(sbi, curseg);
2326 }
2327
2328 void f2fs_allocate_new_segments(struct f2fs_sb_info *sbi)
2329 {
2330         struct curseg_info *curseg;
2331         unsigned int old_segno;
2332         int i;
2333
2334         down_write(&SIT_I(sbi)->sentry_lock);
2335
2336         for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++) {
2337                 curseg = CURSEG_I(sbi, i);
2338                 old_segno = curseg->segno;
2339                 SIT_I(sbi)->s_ops->allocate_segment(sbi, i, true);
2340                 locate_dirty_segment(sbi, old_segno);
2341         }
2342
2343         up_write(&SIT_I(sbi)->sentry_lock);
2344 }
2345
2346 static const struct segment_allocation default_salloc_ops = {
2347         .allocate_segment = allocate_segment_by_default,
2348 };
2349
2350 bool f2fs_exist_trim_candidates(struct f2fs_sb_info *sbi,
2351                                                 struct cp_control *cpc)
2352 {
2353         __u64 trim_start = cpc->trim_start;
2354         bool has_candidate = false;
2355
2356         down_write(&SIT_I(sbi)->sentry_lock);
2357         for (; cpc->trim_start <= cpc->trim_end; cpc->trim_start++) {
2358                 if (add_discard_addrs(sbi, cpc, true)) {
2359                         has_candidate = true;
2360                         break;
2361                 }
2362         }
2363         up_write(&SIT_I(sbi)->sentry_lock);
2364
2365         cpc->trim_start = trim_start;
2366         return has_candidate;
2367 }
2368
2369 static void __issue_discard_cmd_range(struct f2fs_sb_info *sbi,
2370                                         struct discard_policy *dpolicy,
2371                                         unsigned int start, unsigned int end)
2372 {
2373         struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
2374         struct discard_cmd *prev_dc = NULL, *next_dc = NULL;
2375         struct rb_node **insert_p = NULL, *insert_parent = NULL;
2376         struct discard_cmd *dc;
2377         struct blk_plug plug;
2378         int issued;
2379
2380 next:
2381         issued = 0;
2382
2383         mutex_lock(&dcc->cmd_lock);
2384         f2fs_bug_on(sbi, !f2fs_check_rb_tree_consistence(sbi, &dcc->root));
2385
2386         dc = (struct discard_cmd *)f2fs_lookup_rb_tree_ret(&dcc->root,
2387                                         NULL, start,
2388                                         (struct rb_entry **)&prev_dc,
2389                                         (struct rb_entry **)&next_dc,
2390                                         &insert_p, &insert_parent, true);
2391         if (!dc)
2392                 dc = next_dc;
2393
2394         blk_start_plug(&plug);
2395
2396         while (dc && dc->lstart <= end) {
2397                 struct rb_node *node;
2398
2399                 if (dc->len < dpolicy->granularity)
2400                         goto skip;
2401
2402                 if (dc->state != D_PREP) {
2403                         list_move_tail(&dc->list, &dcc->fstrim_list);
2404                         goto skip;
2405                 }
2406
2407                 __submit_discard_cmd(sbi, dpolicy, dc);
2408
2409                 if (++issued >= dpolicy->max_requests) {
2410                         start = dc->lstart + dc->len;
2411
2412                         blk_finish_plug(&plug);
2413                         mutex_unlock(&dcc->cmd_lock);
2414                         __wait_all_discard_cmd(sbi, NULL);
2415                         congestion_wait(BLK_RW_ASYNC, HZ/50);
2416                         goto next;
2417                 }
2418 skip:
2419                 node = rb_next(&dc->rb_node);
2420                 dc = rb_entry_safe(node, struct discard_cmd, rb_node);
2421
2422                 if (fatal_signal_pending(current))
2423                         break;
2424         }
2425
2426         blk_finish_plug(&plug);
2427         mutex_unlock(&dcc->cmd_lock);
2428 }
2429
2430 int f2fs_trim_fs(struct f2fs_sb_info *sbi, struct fstrim_range *range)
2431 {
2432         __u64 start = F2FS_BYTES_TO_BLK(range->start);
2433         __u64 end = start + F2FS_BYTES_TO_BLK(range->len) - 1;
2434         unsigned int start_segno, end_segno;
2435         block_t start_block, end_block;
2436         struct cp_control cpc;
2437         struct discard_policy dpolicy;
2438         unsigned long long trimmed = 0;
2439         int err = 0;
2440
2441         if (start >= MAX_BLKADDR(sbi) || range->len < sbi->blocksize)
2442                 return -EINVAL;
2443
2444         if (end <= MAIN_BLKADDR(sbi))
2445                 return -EINVAL;
2446
2447         if (is_sbi_flag_set(sbi, SBI_NEED_FSCK)) {
2448                 f2fs_msg(sbi->sb, KERN_WARNING,
2449                         "Found FS corruption, run fsck to fix.");
2450                 return -EIO;
2451         }
2452
2453         /* start/end segment number in main_area */
2454         start_segno = (start <= MAIN_BLKADDR(sbi)) ? 0 : GET_SEGNO(sbi, start);
2455         end_segno = (end >= MAX_BLKADDR(sbi)) ? MAIN_SEGS(sbi) - 1 :
2456                                                 GET_SEGNO(sbi, end);
2457
2458         cpc.reason = CP_DISCARD;
2459         cpc.trim_minlen = max_t(__u64, 1, F2FS_BYTES_TO_BLK(range->minlen));
2460         cpc.trim_start = start_segno;
2461         cpc.trim_end = end_segno;
2462
2463         if (sbi->discard_blks == 0)
2464                 goto out;
2465
2466         mutex_lock(&sbi->gc_mutex);
2467         err = f2fs_write_checkpoint(sbi, &cpc);
2468         mutex_unlock(&sbi->gc_mutex);
2469         if (err)
2470                 goto out;
2471
2472         start_block = START_BLOCK(sbi, start_segno);
2473         end_block = START_BLOCK(sbi, end_segno + 1);
2474
2475         __init_discard_policy(sbi, &dpolicy, DPOLICY_FSTRIM, cpc.trim_minlen);
2476         __issue_discard_cmd_range(sbi, &dpolicy, start_block, end_block);
2477
2478         /*
2479          * We filed discard candidates, but actually we don't need to wait for
2480          * all of them, since they'll be issued in idle time along with runtime
2481          * discard option. User configuration looks like using runtime discard
2482          * or periodic fstrim instead of it.
2483          */
2484         if (!test_opt(sbi, DISCARD)) {
2485                 trimmed = __wait_discard_cmd_range(sbi, &dpolicy,
2486                                         start_block, end_block);
2487                 range->len = F2FS_BLK_TO_BYTES(trimmed);
2488         }
2489 out:
2490         return err;
2491 }
2492
2493 static bool __has_curseg_space(struct f2fs_sb_info *sbi, int type)
2494 {
2495         struct curseg_info *curseg = CURSEG_I(sbi, type);
2496         if (curseg->next_blkoff < sbi->blocks_per_seg)
2497                 return true;
2498         return false;
2499 }
2500
2501 int f2fs_rw_hint_to_seg_type(enum rw_hint hint)
2502 {
2503         switch (hint) {
2504         case WRITE_LIFE_SHORT:
2505                 return CURSEG_HOT_DATA;
2506         case WRITE_LIFE_EXTREME:
2507                 return CURSEG_COLD_DATA;
2508         default:
2509                 return CURSEG_WARM_DATA;
2510         }
2511 }
2512
2513 /* This returns write hints for each segment type. This hints will be
2514  * passed down to block layer. There are mapping tables which depend on
2515  * the mount option 'whint_mode'.
2516  *
2517  * 1) whint_mode=off. F2FS only passes down WRITE_LIFE_NOT_SET.
2518  *
2519  * 2) whint_mode=user-based. F2FS tries to pass down hints given by users.
2520  *
2521  * User                  F2FS                     Block
2522  * ----                  ----                     -----
2523  *                       META                     WRITE_LIFE_NOT_SET
2524  *                       HOT_NODE                 "
2525  *                       WARM_NODE                "
2526  *                       COLD_NODE                "
2527  * ioctl(COLD)           COLD_DATA                WRITE_LIFE_EXTREME
2528  * extension list        "                        "
2529  *
2530  * -- buffered io
2531  * WRITE_LIFE_EXTREME    COLD_DATA                WRITE_LIFE_EXTREME
2532  * WRITE_LIFE_SHORT      HOT_DATA                 WRITE_LIFE_SHORT
2533  * WRITE_LIFE_NOT_SET    WARM_DATA                WRITE_LIFE_NOT_SET
2534  * WRITE_LIFE_NONE       "                        "
2535  * WRITE_LIFE_MEDIUM     "                        "
2536  * WRITE_LIFE_LONG       "                        "
2537  *
2538  * -- direct io
2539  * WRITE_LIFE_EXTREME    COLD_DATA                WRITE_LIFE_EXTREME
2540  * WRITE_LIFE_SHORT      HOT_DATA                 WRITE_LIFE_SHORT
2541  * WRITE_LIFE_NOT_SET    WARM_DATA                WRITE_LIFE_NOT_SET
2542  * WRITE_LIFE_NONE       "                        WRITE_LIFE_NONE
2543  * WRITE_LIFE_MEDIUM     "                        WRITE_LIFE_MEDIUM
2544  * WRITE_LIFE_LONG       "                        WRITE_LIFE_LONG
2545  *
2546  * 3) whint_mode=fs-based. F2FS passes down hints with its policy.
2547  *
2548  * User                  F2FS                     Block
2549  * ----                  ----                     -----
2550  *                       META                     WRITE_LIFE_MEDIUM;
2551  *                       HOT_NODE                 WRITE_LIFE_NOT_SET
2552  *                       WARM_NODE                "
2553  *                       COLD_NODE                WRITE_LIFE_NONE
2554  * ioctl(COLD)           COLD_DATA                WRITE_LIFE_EXTREME
2555  * extension list        "                        "
2556  *
2557  * -- buffered io
2558  * WRITE_LIFE_EXTREME    COLD_DATA                WRITE_LIFE_EXTREME
2559  * WRITE_LIFE_SHORT      HOT_DATA                 WRITE_LIFE_SHORT
2560  * WRITE_LIFE_NOT_SET    WARM_DATA                WRITE_LIFE_LONG
2561  * WRITE_LIFE_NONE       "                        "
2562  * WRITE_LIFE_MEDIUM     "                        "
2563  * WRITE_LIFE_LONG       "                        "
2564  *
2565  * -- direct io
2566  * WRITE_LIFE_EXTREME    COLD_DATA                WRITE_LIFE_EXTREME
2567  * WRITE_LIFE_SHORT      HOT_DATA                 WRITE_LIFE_SHORT
2568  * WRITE_LIFE_NOT_SET    WARM_DATA                WRITE_LIFE_NOT_SET
2569  * WRITE_LIFE_NONE       "                        WRITE_LIFE_NONE
2570  * WRITE_LIFE_MEDIUM     "                        WRITE_LIFE_MEDIUM
2571  * WRITE_LIFE_LONG       "                        WRITE_LIFE_LONG
2572  */
2573
2574 enum rw_hint f2fs_io_type_to_rw_hint(struct f2fs_sb_info *sbi,
2575                                 enum page_type type, enum temp_type temp)
2576 {
2577         if (F2FS_OPTION(sbi).whint_mode == WHINT_MODE_USER) {
2578                 if (type == DATA) {
2579                         if (temp == WARM)
2580                                 return WRITE_LIFE_NOT_SET;
2581                         else if (temp == HOT)
2582                                 return WRITE_LIFE_SHORT;
2583                         else if (temp == COLD)
2584                                 return WRITE_LIFE_EXTREME;
2585                 } else {
2586                         return WRITE_LIFE_NOT_SET;
2587                 }
2588         } else if (F2FS_OPTION(sbi).whint_mode == WHINT_MODE_FS) {
2589                 if (type == DATA) {
2590                         if (temp == WARM)
2591                                 return WRITE_LIFE_LONG;
2592                         else if (temp == HOT)
2593                                 return WRITE_LIFE_SHORT;
2594                         else if (temp == COLD)
2595                                 return WRITE_LIFE_EXTREME;
2596                 } else if (type == NODE) {
2597                         if (temp == WARM || temp == HOT)
2598                                 return WRITE_LIFE_NOT_SET;
2599                         else if (temp == COLD)
2600                                 return WRITE_LIFE_NONE;
2601                 } else if (type == META) {
2602                         return WRITE_LIFE_MEDIUM;
2603                 }
2604         }
2605         return WRITE_LIFE_NOT_SET;
2606 }
2607
2608 static int __get_segment_type_2(struct f2fs_io_info *fio)
2609 {
2610         if (fio->type == DATA)
2611                 return CURSEG_HOT_DATA;
2612         else
2613                 return CURSEG_HOT_NODE;
2614 }
2615
2616 static int __get_segment_type_4(struct f2fs_io_info *fio)
2617 {
2618         if (fio->type == DATA) {
2619                 struct inode *inode = fio->page->mapping->host;
2620
2621                 if (S_ISDIR(inode->i_mode))
2622                         return CURSEG_HOT_DATA;
2623                 else
2624                         return CURSEG_COLD_DATA;
2625         } else {
2626                 if (IS_DNODE(fio->page) && is_cold_node(fio->page))
2627                         return CURSEG_WARM_NODE;
2628                 else
2629                         return CURSEG_COLD_NODE;
2630         }
2631 }
2632
2633 static int __get_segment_type_6(struct f2fs_io_info *fio)
2634 {
2635         if (fio->type == DATA) {
2636                 struct inode *inode = fio->page->mapping->host;
2637
2638                 if (is_cold_data(fio->page) || file_is_cold(inode))
2639                         return CURSEG_COLD_DATA;
2640                 if (file_is_hot(inode) ||
2641                                 is_inode_flag_set(inode, FI_HOT_DATA) ||
2642                                 is_inode_flag_set(inode, FI_ATOMIC_FILE) ||
2643                                 is_inode_flag_set(inode, FI_VOLATILE_FILE))
2644                         return CURSEG_HOT_DATA;
2645                 return f2fs_rw_hint_to_seg_type(inode->i_write_hint);
2646         } else {
2647                 if (IS_DNODE(fio->page))
2648                         return is_cold_node(fio->page) ? CURSEG_WARM_NODE :
2649                                                 CURSEG_HOT_NODE;
2650                 return CURSEG_COLD_NODE;
2651         }
2652 }
2653
2654 static int __get_segment_type(struct f2fs_io_info *fio)
2655 {
2656         int type = 0;
2657
2658         switch (F2FS_OPTION(fio->sbi).active_logs) {
2659         case 2:
2660                 type = __get_segment_type_2(fio);
2661                 break;
2662         case 4:
2663                 type = __get_segment_type_4(fio);
2664                 break;
2665         case 6:
2666                 type = __get_segment_type_6(fio);
2667                 break;
2668         default:
2669                 f2fs_bug_on(fio->sbi, true);
2670         }
2671
2672         if (IS_HOT(type))
2673                 fio->temp = HOT;
2674         else if (IS_WARM(type))
2675                 fio->temp = WARM;
2676         else
2677                 fio->temp = COLD;
2678         return type;
2679 }
2680
2681 void f2fs_allocate_data_block(struct f2fs_sb_info *sbi, struct page *page,
2682                 block_t old_blkaddr, block_t *new_blkaddr,
2683                 struct f2fs_summary *sum, int type,
2684                 struct f2fs_io_info *fio, bool add_list)
2685 {
2686         struct sit_info *sit_i = SIT_I(sbi);
2687         struct curseg_info *curseg = CURSEG_I(sbi, type);
2688
2689         down_read(&SM_I(sbi)->curseg_lock);
2690
2691         mutex_lock(&curseg->curseg_mutex);
2692         down_write(&sit_i->sentry_lock);
2693
2694         *new_blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
2695
2696         f2fs_wait_discard_bio(sbi, *new_blkaddr);
2697
2698         /*
2699          * __add_sum_entry should be resided under the curseg_mutex
2700          * because, this function updates a summary entry in the
2701          * current summary block.
2702          */
2703         __add_sum_entry(sbi, type, sum);
2704
2705         __refresh_next_blkoff(sbi, curseg);
2706
2707         stat_inc_block_count(sbi, curseg);
2708
2709         /*
2710          * SIT information should be updated before segment allocation,
2711          * since SSR needs latest valid block information.
2712          */
2713         update_sit_entry(sbi, *new_blkaddr, 1);
2714         if (GET_SEGNO(sbi, old_blkaddr) != NULL_SEGNO)
2715                 update_sit_entry(sbi, old_blkaddr, -1);
2716
2717         if (!__has_curseg_space(sbi, type))
2718                 sit_i->s_ops->allocate_segment(sbi, type, false);
2719
2720         /*
2721          * segment dirty status should be updated after segment allocation,
2722          * so we just need to update status only one time after previous
2723          * segment being closed.
2724          */
2725         locate_dirty_segment(sbi, GET_SEGNO(sbi, old_blkaddr));
2726         locate_dirty_segment(sbi, GET_SEGNO(sbi, *new_blkaddr));
2727
2728         up_write(&sit_i->sentry_lock);
2729
2730         if (page && IS_NODESEG(type)) {
2731                 fill_node_footer_blkaddr(page, NEXT_FREE_BLKADDR(sbi, curseg));
2732
2733                 f2fs_inode_chksum_set(sbi, page);
2734         }
2735
2736         if (add_list) {
2737                 struct f2fs_bio_info *io;
2738
2739                 INIT_LIST_HEAD(&fio->list);
2740                 fio->in_list = true;
2741                 fio->retry = false;
2742                 io = sbi->write_io[fio->type] + fio->temp;
2743                 spin_lock(&io->io_lock);
2744                 list_add_tail(&fio->list, &io->io_list);
2745                 spin_unlock(&io->io_lock);
2746         }
2747
2748         mutex_unlock(&curseg->curseg_mutex);
2749
2750         up_read(&SM_I(sbi)->curseg_lock);
2751 }
2752
2753 static void update_device_state(struct f2fs_io_info *fio)
2754 {
2755         struct f2fs_sb_info *sbi = fio->sbi;
2756         unsigned int devidx;
2757
2758         if (!sbi->s_ndevs)
2759                 return;
2760
2761         devidx = f2fs_target_device_index(sbi, fio->new_blkaddr);
2762
2763         /* update device state for fsync */
2764         f2fs_set_dirty_device(sbi, fio->ino, devidx, FLUSH_INO);
2765
2766         /* update device state for checkpoint */
2767         if (!f2fs_test_bit(devidx, (char *)&sbi->dirty_device)) {
2768                 spin_lock(&sbi->dev_lock);
2769                 f2fs_set_bit(devidx, (char *)&sbi->dirty_device);
2770                 spin_unlock(&sbi->dev_lock);
2771         }
2772 }
2773
2774 static void do_write_page(struct f2fs_summary *sum, struct f2fs_io_info *fio)
2775 {
2776         int type = __get_segment_type(fio);
2777         bool keep_order = (test_opt(fio->sbi, LFS) && type == CURSEG_COLD_DATA);
2778
2779         if (keep_order)
2780                 down_read(&fio->sbi->io_order_lock);
2781 reallocate:
2782         f2fs_allocate_data_block(fio->sbi, fio->page, fio->old_blkaddr,
2783                         &fio->new_blkaddr, sum, type, fio, true);
2784
2785         /* writeout dirty page into bdev */
2786         f2fs_submit_page_write(fio);
2787         if (fio->retry) {
2788                 fio->old_blkaddr = fio->new_blkaddr;
2789                 goto reallocate;
2790         }
2791
2792         update_device_state(fio);
2793
2794         if (keep_order)
2795                 up_read(&fio->sbi->io_order_lock);
2796 }
2797
2798 void f2fs_do_write_meta_page(struct f2fs_sb_info *sbi, struct page *page,
2799                                         enum iostat_type io_type)
2800 {
2801         struct f2fs_io_info fio = {
2802                 .sbi = sbi,
2803                 .type = META,
2804                 .temp = HOT,
2805                 .op = REQ_OP_WRITE,
2806                 .op_flags = REQ_SYNC | REQ_META | REQ_PRIO,
2807                 .old_blkaddr = page->index,
2808                 .new_blkaddr = page->index,
2809                 .page = page,
2810                 .encrypted_page = NULL,
2811                 .in_list = false,
2812         };
2813
2814         if (unlikely(page->index >= MAIN_BLKADDR(sbi)))
2815                 fio.op_flags &= ~REQ_META;
2816
2817         set_page_writeback(page);
2818         ClearPageError(page);
2819         f2fs_submit_page_write(&fio);
2820
2821         f2fs_update_iostat(sbi, io_type, F2FS_BLKSIZE);
2822 }
2823
2824 void f2fs_do_write_node_page(unsigned int nid, struct f2fs_io_info *fio)
2825 {
2826         struct f2fs_summary sum;
2827
2828         set_summary(&sum, nid, 0, 0);
2829         do_write_page(&sum, fio);
2830
2831         f2fs_update_iostat(fio->sbi, fio->io_type, F2FS_BLKSIZE);
2832 }
2833
2834 void f2fs_outplace_write_data(struct dnode_of_data *dn,
2835                                         struct f2fs_io_info *fio)
2836 {
2837         struct f2fs_sb_info *sbi = fio->sbi;
2838         struct f2fs_summary sum;
2839         struct node_info ni;
2840
2841         f2fs_bug_on(sbi, dn->data_blkaddr == NULL_ADDR);
2842         f2fs_get_node_info(sbi, dn->nid, &ni);
2843         set_summary(&sum, dn->nid, dn->ofs_in_node, ni.version);
2844         do_write_page(&sum, fio);
2845         f2fs_update_data_blkaddr(dn, fio->new_blkaddr);
2846
2847         f2fs_update_iostat(sbi, fio->io_type, F2FS_BLKSIZE);
2848 }
2849
2850 int f2fs_inplace_write_data(struct f2fs_io_info *fio)
2851 {
2852         int err;
2853         struct f2fs_sb_info *sbi = fio->sbi;
2854
2855         fio->new_blkaddr = fio->old_blkaddr;
2856         /* i/o temperature is needed for passing down write hints */
2857         __get_segment_type(fio);
2858
2859         f2fs_bug_on(sbi, !IS_DATASEG(get_seg_entry(sbi,
2860                         GET_SEGNO(sbi, fio->new_blkaddr))->type));
2861
2862         stat_inc_inplace_blocks(fio->sbi);
2863
2864         err = f2fs_submit_page_bio(fio);
2865         if (!err)
2866                 update_device_state(fio);
2867
2868         f2fs_update_iostat(fio->sbi, fio->io_type, F2FS_BLKSIZE);
2869
2870         return err;
2871 }
2872
2873 static inline int __f2fs_get_curseg(struct f2fs_sb_info *sbi,
2874                                                 unsigned int segno)
2875 {
2876         int i;
2877
2878         for (i = CURSEG_HOT_DATA; i < NO_CHECK_TYPE; i++) {
2879                 if (CURSEG_I(sbi, i)->segno == segno)
2880                         break;
2881         }
2882         return i;
2883 }
2884
2885 void f2fs_do_replace_block(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
2886                                 block_t old_blkaddr, block_t new_blkaddr,
2887                                 bool recover_curseg, bool recover_newaddr)
2888 {
2889         struct sit_info *sit_i = SIT_I(sbi);
2890         struct curseg_info *curseg;
2891         unsigned int segno, old_cursegno;
2892         struct seg_entry *se;
2893         int type;
2894         unsigned short old_blkoff;
2895
2896         segno = GET_SEGNO(sbi, new_blkaddr);
2897         se = get_seg_entry(sbi, segno);
2898         type = se->type;
2899
2900         down_write(&SM_I(sbi)->curseg_lock);
2901
2902         if (!recover_curseg) {
2903                 /* for recovery flow */
2904                 if (se->valid_blocks == 0 && !IS_CURSEG(sbi, segno)) {
2905                         if (old_blkaddr == NULL_ADDR)
2906                                 type = CURSEG_COLD_DATA;
2907                         else
2908                                 type = CURSEG_WARM_DATA;
2909                 }
2910         } else {
2911                 if (IS_CURSEG(sbi, segno)) {
2912                         /* se->type is volatile as SSR allocation */
2913                         type = __f2fs_get_curseg(sbi, segno);
2914                         f2fs_bug_on(sbi, type == NO_CHECK_TYPE);
2915                 } else {
2916                         type = CURSEG_WARM_DATA;
2917                 }
2918         }
2919
2920         f2fs_bug_on(sbi, !IS_DATASEG(type));
2921         curseg = CURSEG_I(sbi, type);
2922
2923         mutex_lock(&curseg->curseg_mutex);
2924         down_write(&sit_i->sentry_lock);
2925
2926         old_cursegno = curseg->segno;
2927         old_blkoff = curseg->next_blkoff;
2928
2929         /* change the current segment */
2930         if (segno != curseg->segno) {
2931                 curseg->next_segno = segno;
2932                 change_curseg(sbi, type);
2933         }
2934
2935         curseg->next_blkoff = GET_BLKOFF_FROM_SEG0(sbi, new_blkaddr);
2936         __add_sum_entry(sbi, type, sum);
2937
2938         if (!recover_curseg || recover_newaddr)
2939                 update_sit_entry(sbi, new_blkaddr, 1);
2940         if (GET_SEGNO(sbi, old_blkaddr) != NULL_SEGNO)
2941                 update_sit_entry(sbi, old_blkaddr, -1);
2942
2943         locate_dirty_segment(sbi, GET_SEGNO(sbi, old_blkaddr));
2944         locate_dirty_segment(sbi, GET_SEGNO(sbi, new_blkaddr));
2945
2946         locate_dirty_segment(sbi, old_cursegno);
2947
2948         if (recover_curseg) {
2949                 if (old_cursegno != curseg->segno) {
2950                         curseg->next_segno = old_cursegno;
2951                         change_curseg(sbi, type);
2952                 }
2953                 curseg->next_blkoff = old_blkoff;
2954         }
2955
2956         up_write(&sit_i->sentry_lock);
2957         mutex_unlock(&curseg->curseg_mutex);
2958         up_write(&SM_I(sbi)->curseg_lock);
2959 }
2960
2961 void f2fs_replace_block(struct f2fs_sb_info *sbi, struct dnode_of_data *dn,
2962                                 block_t old_addr, block_t new_addr,
2963                                 unsigned char version, bool recover_curseg,
2964                                 bool recover_newaddr)
2965 {
2966         struct f2fs_summary sum;
2967
2968         set_summary(&sum, dn->nid, dn->ofs_in_node, version);
2969
2970         f2fs_do_replace_block(sbi, &sum, old_addr, new_addr,
2971                                         recover_curseg, recover_newaddr);
2972
2973         f2fs_update_data_blkaddr(dn, new_addr);
2974 }
2975
2976 void f2fs_wait_on_page_writeback(struct page *page,
2977                                 enum page_type type, bool ordered)
2978 {
2979         if (PageWriteback(page)) {
2980                 struct f2fs_sb_info *sbi = F2FS_P_SB(page);
2981
2982                 f2fs_submit_merged_write_cond(sbi, page->mapping->host,
2983                                                 0, page->index, type);
2984                 if (ordered)
2985                         wait_on_page_writeback(page);
2986                 else
2987                         wait_for_stable_page(page);
2988         }
2989 }
2990
2991 void f2fs_wait_on_block_writeback(struct f2fs_sb_info *sbi, block_t blkaddr)
2992 {
2993         struct page *cpage;
2994
2995         if (!is_valid_blkaddr(blkaddr))
2996                 return;
2997
2998         cpage = find_lock_page(META_MAPPING(sbi), blkaddr);
2999         if (cpage) {
3000                 f2fs_wait_on_page_writeback(cpage, DATA, true);
3001                 f2fs_put_page(cpage, 1);
3002         }
3003 }
3004
3005 static void read_compacted_summaries(struct f2fs_sb_info *sbi)
3006 {
3007         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
3008         struct curseg_info *seg_i;
3009         unsigned char *kaddr;
3010         struct page *page;
3011         block_t start;
3012         int i, j, offset;
3013
3014         start = start_sum_block(sbi);
3015
3016         page = f2fs_get_meta_page(sbi, start++);
3017         kaddr = (unsigned char *)page_address(page);
3018
3019         /* Step 1: restore nat cache */
3020         seg_i = CURSEG_I(sbi, CURSEG_HOT_DATA);
3021         memcpy(seg_i->journal, kaddr, SUM_JOURNAL_SIZE);
3022
3023         /* Step 2: restore sit cache */
3024         seg_i = CURSEG_I(sbi, CURSEG_COLD_DATA);
3025         memcpy(seg_i->journal, kaddr + SUM_JOURNAL_SIZE, SUM_JOURNAL_SIZE);
3026         offset = 2 * SUM_JOURNAL_SIZE;
3027
3028         /* Step 3: restore summary entries */
3029         for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++) {
3030                 unsigned short blk_off;
3031                 unsigned int segno;
3032
3033                 seg_i = CURSEG_I(sbi, i);
3034                 segno = le32_to_cpu(ckpt->cur_data_segno[i]);
3035                 blk_off = le16_to_cpu(ckpt->cur_data_blkoff[i]);
3036                 seg_i->next_segno = segno;
3037                 reset_curseg(sbi, i, 0);
3038                 seg_i->alloc_type = ckpt->alloc_type[i];
3039                 seg_i->next_blkoff = blk_off;
3040
3041                 if (seg_i->alloc_type == SSR)
3042                         blk_off = sbi->blocks_per_seg;
3043
3044                 for (j = 0; j < blk_off; j++) {
3045                         struct f2fs_summary *s;
3046                         s = (struct f2fs_summary *)(kaddr + offset);
3047                         seg_i->sum_blk->entries[j] = *s;
3048                         offset += SUMMARY_SIZE;
3049                         if (offset + SUMMARY_SIZE <= PAGE_SIZE -
3050                                                 SUM_FOOTER_SIZE)
3051                                 continue;
3052
3053                         f2fs_put_page(page, 1);
3054                         page = NULL;
3055
3056                         page = f2fs_get_meta_page(sbi, start++);
3057                         kaddr = (unsigned char *)page_address(page);
3058                         offset = 0;
3059                 }
3060         }
3061         f2fs_put_page(page, 1);
3062 }
3063
3064 static int read_normal_summaries(struct f2fs_sb_info *sbi, int type)
3065 {
3066         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
3067         struct f2fs_summary_block *sum;
3068         struct curseg_info *curseg;
3069         struct page *new;
3070         unsigned short blk_off;
3071         unsigned int segno = 0;
3072         block_t blk_addr = 0;
3073
3074         /* get segment number and block addr */
3075         if (IS_DATASEG(type)) {
3076                 segno = le32_to_cpu(ckpt->cur_data_segno[type]);
3077                 blk_off = le16_to_cpu(ckpt->cur_data_blkoff[type -
3078                                                         CURSEG_HOT_DATA]);
3079                 if (__exist_node_summaries(sbi))
3080                         blk_addr = sum_blk_addr(sbi, NR_CURSEG_TYPE, type);
3081                 else
3082                         blk_addr = sum_blk_addr(sbi, NR_CURSEG_DATA_TYPE, type);
3083         } else {
3084                 segno = le32_to_cpu(ckpt->cur_node_segno[type -
3085                                                         CURSEG_HOT_NODE]);
3086                 blk_off = le16_to_cpu(ckpt->cur_node_blkoff[type -
3087                                                         CURSEG_HOT_NODE]);
3088                 if (__exist_node_summaries(sbi))
3089                         blk_addr = sum_blk_addr(sbi, NR_CURSEG_NODE_TYPE,
3090                                                         type - CURSEG_HOT_NODE);
3091                 else
3092                         blk_addr = GET_SUM_BLOCK(sbi, segno);
3093         }
3094
3095         new = f2fs_get_meta_page(sbi, blk_addr);
3096         sum = (struct f2fs_summary_block *)page_address(new);
3097
3098         if (IS_NODESEG(type)) {
3099                 if (__exist_node_summaries(sbi)) {
3100                         struct f2fs_summary *ns = &sum->entries[0];
3101                         int i;
3102                         for (i = 0; i < sbi->blocks_per_seg; i++, ns++) {
3103                                 ns->version = 0;
3104                                 ns->ofs_in_node = 0;
3105                         }
3106                 } else {
3107                         f2fs_restore_node_summary(sbi, segno, sum);
3108                 }
3109         }
3110
3111         /* set uncompleted segment to curseg */
3112         curseg = CURSEG_I(sbi, type);
3113         mutex_lock(&curseg->curseg_mutex);
3114
3115         /* update journal info */
3116         down_write(&curseg->journal_rwsem);
3117         memcpy(curseg->journal, &sum->journal, SUM_JOURNAL_SIZE);
3118         up_write(&curseg->journal_rwsem);
3119
3120         memcpy(curseg->sum_blk->entries, sum->entries, SUM_ENTRY_SIZE);
3121         memcpy(&curseg->sum_blk->footer, &sum->footer, SUM_FOOTER_SIZE);
3122         curseg->next_segno = segno;
3123         reset_curseg(sbi, type, 0);
3124         curseg->alloc_type = ckpt->alloc_type[type];
3125         curseg->next_blkoff = blk_off;
3126         mutex_unlock(&curseg->curseg_mutex);
3127         f2fs_put_page(new, 1);
3128         return 0;
3129 }
3130
3131 static int restore_curseg_summaries(struct f2fs_sb_info *sbi)
3132 {
3133         struct f2fs_journal *sit_j = CURSEG_I(sbi, CURSEG_COLD_DATA)->journal;
3134         struct f2fs_journal *nat_j = CURSEG_I(sbi, CURSEG_HOT_DATA)->journal;
3135         int type = CURSEG_HOT_DATA;
3136         int err;
3137
3138         if (is_set_ckpt_flags(sbi, CP_COMPACT_SUM_FLAG)) {
3139                 int npages = f2fs_npages_for_summary_flush(sbi, true);
3140
3141                 if (npages >= 2)
3142                         f2fs_ra_meta_pages(sbi, start_sum_block(sbi), npages,
3143                                                         META_CP, true);
3144
3145                 /* restore for compacted data summary */
3146                 read_compacted_summaries(sbi);
3147                 type = CURSEG_HOT_NODE;
3148         }
3149
3150         if (__exist_node_summaries(sbi))
3151                 f2fs_ra_meta_pages(sbi, sum_blk_addr(sbi, NR_CURSEG_TYPE, type),
3152                                         NR_CURSEG_TYPE - type, META_CP, true);
3153
3154         for (; type <= CURSEG_COLD_NODE; type++) {
3155                 err = read_normal_summaries(sbi, type);
3156                 if (err)
3157                         return err;
3158         }
3159
3160         /* sanity check for summary blocks */
3161         if (nats_in_cursum(nat_j) > NAT_JOURNAL_ENTRIES ||
3162                         sits_in_cursum(sit_j) > SIT_JOURNAL_ENTRIES)
3163                 return -EINVAL;
3164
3165         return 0;
3166 }
3167
3168 static void write_compacted_summaries(struct f2fs_sb_info *sbi, block_t blkaddr)
3169 {
3170         struct page *page;
3171         unsigned char *kaddr;
3172         struct f2fs_summary *summary;
3173         struct curseg_info *seg_i;
3174         int written_size = 0;
3175         int i, j;
3176
3177         page = f2fs_grab_meta_page(sbi, blkaddr++);
3178         kaddr = (unsigned char *)page_address(page);
3179         memset(kaddr, 0, PAGE_SIZE);
3180
3181         /* Step 1: write nat cache */
3182         seg_i = CURSEG_I(sbi, CURSEG_HOT_DATA);
3183         memcpy(kaddr, seg_i->journal, SUM_JOURNAL_SIZE);
3184         written_size += SUM_JOURNAL_SIZE;
3185
3186         /* Step 2: write sit cache */
3187         seg_i = CURSEG_I(sbi, CURSEG_COLD_DATA);
3188         memcpy(kaddr + written_size, seg_i->journal, SUM_JOURNAL_SIZE);
3189         written_size += SUM_JOURNAL_SIZE;
3190
3191         /* Step 3: write summary entries */
3192         for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++) {
3193                 unsigned short blkoff;
3194                 seg_i = CURSEG_I(sbi, i);
3195                 if (sbi->ckpt->alloc_type[i] == SSR)
3196                         blkoff = sbi->blocks_per_seg;
3197                 else
3198                         blkoff = curseg_blkoff(sbi, i);
3199
3200                 for (j = 0; j < blkoff; j++) {
3201                         if (!page) {
3202                                 page = f2fs_grab_meta_page(sbi, blkaddr++);
3203                                 kaddr = (unsigned char *)page_address(page);
3204                                 memset(kaddr, 0, PAGE_SIZE);
3205                                 written_size = 0;
3206                         }
3207                         summary = (struct f2fs_summary *)(kaddr + written_size);
3208                         *summary = seg_i->sum_blk->entries[j];
3209                         written_size += SUMMARY_SIZE;
3210
3211                         if (written_size + SUMMARY_SIZE <= PAGE_SIZE -
3212                                                         SUM_FOOTER_SIZE)
3213                                 continue;
3214
3215                         set_page_dirty(page);
3216                         f2fs_put_page(page, 1);
3217                         page = NULL;
3218                 }
3219         }
3220         if (page) {
3221                 set_page_dirty(page);
3222                 f2fs_put_page(page, 1);
3223         }
3224 }
3225
3226 static void write_normal_summaries(struct f2fs_sb_info *sbi,
3227                                         block_t blkaddr, int type)
3228 {
3229         int i, end;
3230         if (IS_DATASEG(type))
3231                 end = type + NR_CURSEG_DATA_TYPE;
3232         else
3233                 end = type + NR_CURSEG_NODE_TYPE;
3234
3235         for (i = type; i < end; i++)
3236                 write_current_sum_page(sbi, i, blkaddr + (i - type));
3237 }
3238
3239 void f2fs_write_data_summaries(struct f2fs_sb_info *sbi, block_t start_blk)
3240 {
3241         if (is_set_ckpt_flags(sbi, CP_COMPACT_SUM_FLAG))
3242                 write_compacted_summaries(sbi, start_blk);
3243         else
3244                 write_normal_summaries(sbi, start_blk, CURSEG_HOT_DATA);
3245 }
3246
3247 void f2fs_write_node_summaries(struct f2fs_sb_info *sbi, block_t start_blk)
3248 {
3249         write_normal_summaries(sbi, start_blk, CURSEG_HOT_NODE);
3250 }
3251
3252 int f2fs_lookup_journal_in_cursum(struct f2fs_journal *journal, int type,
3253                                         unsigned int val, int alloc)
3254 {
3255         int i;
3256
3257         if (type == NAT_JOURNAL) {
3258                 for (i = 0; i < nats_in_cursum(journal); i++) {
3259                         if (le32_to_cpu(nid_in_journal(journal, i)) == val)
3260                                 return i;
3261                 }
3262                 if (alloc && __has_cursum_space(journal, 1, NAT_JOURNAL))
3263                         return update_nats_in_cursum(journal, 1);
3264         } else if (type == SIT_JOURNAL) {
3265                 for (i = 0; i < sits_in_cursum(journal); i++)
3266                         if (le32_to_cpu(segno_in_journal(journal, i)) == val)
3267                                 return i;
3268                 if (alloc && __has_cursum_space(journal, 1, SIT_JOURNAL))
3269                         return update_sits_in_cursum(journal, 1);
3270         }
3271         return -1;
3272 }
3273
3274 static struct page *get_current_sit_page(struct f2fs_sb_info *sbi,
3275                                         unsigned int segno)
3276 {
3277         return f2fs_get_meta_page(sbi, current_sit_addr(sbi, segno));
3278 }
3279
3280 static struct page *get_next_sit_page(struct f2fs_sb_info *sbi,
3281                                         unsigned int start)
3282 {
3283         struct sit_info *sit_i = SIT_I(sbi);
3284         struct page *page;
3285         pgoff_t src_off, dst_off;
3286
3287         src_off = current_sit_addr(sbi, start);
3288         dst_off = next_sit_addr(sbi, src_off);
3289
3290         page = f2fs_grab_meta_page(sbi, dst_off);
3291         seg_info_to_sit_page(sbi, page, start);
3292
3293         set_page_dirty(page);
3294         set_to_next_sit(sit_i, start);
3295
3296         return page;
3297 }
3298
3299 static struct sit_entry_set *grab_sit_entry_set(void)
3300 {
3301         struct sit_entry_set *ses =
3302                         f2fs_kmem_cache_alloc(sit_entry_set_slab, GFP_NOFS);
3303
3304         ses->entry_cnt = 0;
3305         INIT_LIST_HEAD(&ses->set_list);
3306         return ses;
3307 }
3308
3309 static void release_sit_entry_set(struct sit_entry_set *ses)
3310 {
3311         list_del(&ses->set_list);
3312         kmem_cache_free(sit_entry_set_slab, ses);
3313 }
3314
3315 static void adjust_sit_entry_set(struct sit_entry_set *ses,
3316                                                 struct list_head *head)
3317 {
3318         struct sit_entry_set *next = ses;
3319
3320         if (list_is_last(&ses->set_list, head))
3321                 return;
3322
3323         list_for_each_entry_continue(next, head, set_list)
3324                 if (ses->entry_cnt <= next->entry_cnt)
3325                         break;
3326
3327         list_move_tail(&ses->set_list, &next->set_list);
3328 }
3329
3330 static void add_sit_entry(unsigned int segno, struct list_head *head)
3331 {
3332         struct sit_entry_set *ses;
3333         unsigned int start_segno = START_SEGNO(segno);
3334
3335         list_for_each_entry(ses, head, set_list) {
3336                 if (ses->start_segno == start_segno) {
3337                         ses->entry_cnt++;
3338                         adjust_sit_entry_set(ses, head);
3339                         return;
3340                 }
3341         }
3342
3343         ses = grab_sit_entry_set();
3344
3345         ses->start_segno = start_segno;
3346         ses->entry_cnt++;
3347         list_add(&ses->set_list, head);
3348 }
3349
3350 static void add_sits_in_set(struct f2fs_sb_info *sbi)
3351 {
3352         struct f2fs_sm_info *sm_info = SM_I(sbi);
3353         struct list_head *set_list = &sm_info->sit_entry_set;
3354         unsigned long *bitmap = SIT_I(sbi)->dirty_sentries_bitmap;
3355         unsigned int segno;
3356
3357         for_each_set_bit(segno, bitmap, MAIN_SEGS(sbi))
3358                 add_sit_entry(segno, set_list);
3359 }
3360
3361 static void remove_sits_in_journal(struct f2fs_sb_info *sbi)
3362 {
3363         struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_COLD_DATA);
3364         struct f2fs_journal *journal = curseg->journal;
3365         int i;
3366
3367         down_write(&curseg->journal_rwsem);
3368         for (i = 0; i < sits_in_cursum(journal); i++) {
3369                 unsigned int segno;
3370                 bool dirtied;
3371
3372                 segno = le32_to_cpu(segno_in_journal(journal, i));
3373                 dirtied = __mark_sit_entry_dirty(sbi, segno);
3374
3375                 if (!dirtied)
3376                         add_sit_entry(segno, &SM_I(sbi)->sit_entry_set);
3377         }
3378         update_sits_in_cursum(journal, -i);
3379         up_write(&curseg->journal_rwsem);
3380 }
3381
3382 /*
3383  * CP calls this function, which flushes SIT entries including sit_journal,
3384  * and moves prefree segs to free segs.
3385  */
3386 void f2fs_flush_sit_entries(struct f2fs_sb_info *sbi, struct cp_control *cpc)
3387 {
3388         struct sit_info *sit_i = SIT_I(sbi);
3389         unsigned long *bitmap = sit_i->dirty_sentries_bitmap;
3390         struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_COLD_DATA);
3391         struct f2fs_journal *journal = curseg->journal;
3392         struct sit_entry_set *ses, *tmp;
3393         struct list_head *head = &SM_I(sbi)->sit_entry_set;
3394         bool to_journal = true;
3395         struct seg_entry *se;
3396
3397         down_write(&sit_i->sentry_lock);
3398
3399         if (!sit_i->dirty_sentries)
3400                 goto out;
3401
3402         /*
3403          * add and account sit entries of dirty bitmap in sit entry
3404          * set temporarily
3405          */
3406         add_sits_in_set(sbi);
3407
3408         /*
3409          * if there are no enough space in journal to store dirty sit
3410          * entries, remove all entries from journal and add and account
3411          * them in sit entry set.
3412          */
3413         if (!__has_cursum_space(journal, sit_i->dirty_sentries, SIT_JOURNAL))
3414                 remove_sits_in_journal(sbi);
3415
3416         /*
3417          * there are two steps to flush sit entries:
3418          * #1, flush sit entries to journal in current cold data summary block.
3419          * #2, flush sit entries to sit page.
3420          */
3421         list_for_each_entry_safe(ses, tmp, head, set_list) {
3422                 struct page *page = NULL;
3423                 struct f2fs_sit_block *raw_sit = NULL;
3424                 unsigned int start_segno = ses->start_segno;
3425                 unsigned int end = min(start_segno + SIT_ENTRY_PER_BLOCK,
3426                                                 (unsigned long)MAIN_SEGS(sbi));
3427                 unsigned int segno = start_segno;
3428
3429                 if (to_journal &&
3430                         !__has_cursum_space(journal, ses->entry_cnt, SIT_JOURNAL))
3431                         to_journal = false;
3432
3433                 if (to_journal) {
3434                         down_write(&curseg->journal_rwsem);
3435                 } else {
3436                         page = get_next_sit_page(sbi, start_segno);
3437                         raw_sit = page_address(page);
3438                 }
3439
3440                 /* flush dirty sit entries in region of current sit set */
3441                 for_each_set_bit_from(segno, bitmap, end) {
3442                         int offset, sit_offset;
3443
3444                         se = get_seg_entry(sbi, segno);
3445 #ifdef CONFIG_F2FS_CHECK_FS
3446                         if (memcmp(se->cur_valid_map, se->cur_valid_map_mir,
3447                                                 SIT_VBLOCK_MAP_SIZE))
3448                                 f2fs_bug_on(sbi, 1);
3449 #endif
3450
3451                         /* add discard candidates */
3452                         if (!(cpc->reason & CP_DISCARD)) {
3453                                 cpc->trim_start = segno;
3454                                 add_discard_addrs(sbi, cpc, false);
3455                         }
3456
3457                         if (to_journal) {
3458                                 offset = f2fs_lookup_journal_in_cursum(journal,
3459                                                         SIT_JOURNAL, segno, 1);
3460                                 f2fs_bug_on(sbi, offset < 0);
3461                                 segno_in_journal(journal, offset) =
3462                                                         cpu_to_le32(segno);
3463                                 seg_info_to_raw_sit(se,
3464                                         &sit_in_journal(journal, offset));
3465                                 check_block_count(sbi, segno,
3466                                         &sit_in_journal(journal, offset));
3467                         } else {
3468                                 sit_offset = SIT_ENTRY_OFFSET(sit_i, segno);
3469                                 seg_info_to_raw_sit(se,
3470                                                 &raw_sit->entries[sit_offset]);
3471                                 check_block_count(sbi, segno,
3472                                                 &raw_sit->entries[sit_offset]);
3473                         }
3474
3475                         __clear_bit(segno, bitmap);
3476                         sit_i->dirty_sentries--;
3477                         ses->entry_cnt--;
3478                 }
3479
3480                 if (to_journal)
3481                         up_write(&curseg->journal_rwsem);
3482                 else
3483                         f2fs_put_page(page, 1);
3484
3485                 f2fs_bug_on(sbi, ses->entry_cnt);
3486                 release_sit_entry_set(ses);
3487         }
3488
3489         f2fs_bug_on(sbi, !list_empty(head));
3490         f2fs_bug_on(sbi, sit_i->dirty_sentries);
3491 out:
3492         if (cpc->reason & CP_DISCARD) {
3493                 __u64 trim_start = cpc->trim_start;
3494
3495                 for (; cpc->trim_start <= cpc->trim_end; cpc->trim_start++)
3496                         add_discard_addrs(sbi, cpc, false);
3497
3498                 cpc->trim_start = trim_start;
3499         }
3500         up_write(&sit_i->sentry_lock);
3501
3502         set_prefree_as_free_segments(sbi);
3503 }
3504
3505 static int build_sit_info(struct f2fs_sb_info *sbi)
3506 {
3507         struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
3508         struct sit_info *sit_i;
3509         unsigned int sit_segs, start;
3510         char *src_bitmap;
3511         unsigned int bitmap_size;
3512
3513         /* allocate memory for SIT information */
3514         sit_i = f2fs_kzalloc(sbi, sizeof(struct sit_info), GFP_KERNEL);
3515         if (!sit_i)
3516                 return -ENOMEM;
3517
3518         SM_I(sbi)->sit_info = sit_i;
3519
3520         sit_i->sentries =
3521                 f2fs_kvzalloc(sbi, array_size(sizeof(struct seg_entry),
3522                                               MAIN_SEGS(sbi)),
3523                               GFP_KERNEL);
3524         if (!sit_i->sentries)
3525                 return -ENOMEM;
3526
3527         bitmap_size = f2fs_bitmap_size(MAIN_SEGS(sbi));
3528         sit_i->dirty_sentries_bitmap = f2fs_kvzalloc(sbi, bitmap_size,
3529                                                                 GFP_KERNEL);
3530         if (!sit_i->dirty_sentries_bitmap)
3531                 return -ENOMEM;
3532
3533         for (start = 0; start < MAIN_SEGS(sbi); start++) {
3534                 sit_i->sentries[start].cur_valid_map
3535                         = f2fs_kzalloc(sbi, SIT_VBLOCK_MAP_SIZE, GFP_KERNEL);
3536                 sit_i->sentries[start].ckpt_valid_map
3537                         = f2fs_kzalloc(sbi, SIT_VBLOCK_MAP_SIZE, GFP_KERNEL);
3538                 if (!sit_i->sentries[start].cur_valid_map ||
3539                                 !sit_i->sentries[start].ckpt_valid_map)
3540                         return -ENOMEM;
3541
3542 #ifdef CONFIG_F2FS_CHECK_FS
3543                 sit_i->sentries[start].cur_valid_map_mir
3544                         = f2fs_kzalloc(sbi, SIT_VBLOCK_MAP_SIZE, GFP_KERNEL);
3545                 if (!sit_i->sentries[start].cur_valid_map_mir)
3546                         return -ENOMEM;
3547 #endif
3548
3549                 if (f2fs_discard_en(sbi)) {
3550                         sit_i->sentries[start].discard_map
3551                                 = f2fs_kzalloc(sbi, SIT_VBLOCK_MAP_SIZE,
3552                                                                 GFP_KERNEL);
3553                         if (!sit_i->sentries[start].discard_map)
3554                                 return -ENOMEM;
3555                 }
3556         }
3557
3558         sit_i->tmp_map = f2fs_kzalloc(sbi, SIT_VBLOCK_MAP_SIZE, GFP_KERNEL);
3559         if (!sit_i->tmp_map)
3560                 return -ENOMEM;
3561
3562         if (sbi->segs_per_sec > 1) {
3563                 sit_i->sec_entries =
3564                         f2fs_kvzalloc(sbi, array_size(sizeof(struct sec_entry),
3565                                                       MAIN_SECS(sbi)),
3566                                       GFP_KERNEL);
3567                 if (!sit_i->sec_entries)
3568                         return -ENOMEM;
3569         }
3570
3571         /* get information related with SIT */
3572         sit_segs = le32_to_cpu(raw_super->segment_count_sit) >> 1;
3573
3574         /* setup SIT bitmap from ckeckpoint pack */
3575         bitmap_size = __bitmap_size(sbi, SIT_BITMAP);
3576         src_bitmap = __bitmap_ptr(sbi, SIT_BITMAP);
3577
3578         sit_i->sit_bitmap = kmemdup(src_bitmap, bitmap_size, GFP_KERNEL);
3579         if (!sit_i->sit_bitmap)
3580                 return -ENOMEM;
3581
3582 #ifdef CONFIG_F2FS_CHECK_FS
3583         sit_i->sit_bitmap_mir = kmemdup(src_bitmap, bitmap_size, GFP_KERNEL);
3584         if (!sit_i->sit_bitmap_mir)
3585                 return -ENOMEM;
3586 #endif
3587
3588         /* init SIT information */
3589         sit_i->s_ops = &default_salloc_ops;
3590
3591         sit_i->sit_base_addr = le32_to_cpu(raw_super->sit_blkaddr);
3592         sit_i->sit_blocks = sit_segs << sbi->log_blocks_per_seg;
3593         sit_i->written_valid_blocks = 0;
3594         sit_i->bitmap_size = bitmap_size;
3595         sit_i->dirty_sentries = 0;
3596         sit_i->sents_per_block = SIT_ENTRY_PER_BLOCK;
3597         sit_i->elapsed_time = le64_to_cpu(sbi->ckpt->elapsed_time);
3598         sit_i->mounted_time = ktime_get_real_seconds();
3599         init_rwsem(&sit_i->sentry_lock);
3600         return 0;
3601 }
3602
3603 static int build_free_segmap(struct f2fs_sb_info *sbi)
3604 {
3605         struct free_segmap_info *free_i;
3606         unsigned int bitmap_size, sec_bitmap_size;
3607
3608         /* allocate memory for free segmap information */
3609         free_i = f2fs_kzalloc(sbi, sizeof(struct free_segmap_info), GFP_KERNEL);
3610         if (!free_i)
3611                 return -ENOMEM;
3612
3613         SM_I(sbi)->free_info = free_i;
3614
3615         bitmap_size = f2fs_bitmap_size(MAIN_SEGS(sbi));
3616         free_i->free_segmap = f2fs_kvmalloc(sbi, bitmap_size, GFP_KERNEL);
3617         if (!free_i->free_segmap)
3618                 return -ENOMEM;
3619
3620         sec_bitmap_size = f2fs_bitmap_size(MAIN_SECS(sbi));
3621         free_i->free_secmap = f2fs_kvmalloc(sbi, sec_bitmap_size, GFP_KERNEL);
3622         if (!free_i->free_secmap)
3623                 return -ENOMEM;
3624
3625         /* set all segments as dirty temporarily */
3626         memset(free_i->free_segmap, 0xff, bitmap_size);
3627         memset(free_i->free_secmap, 0xff, sec_bitmap_size);
3628
3629         /* init free segmap information */
3630         free_i->start_segno = GET_SEGNO_FROM_SEG0(sbi, MAIN_BLKADDR(sbi));
3631         free_i->free_segments = 0;
3632         free_i->free_sections = 0;
3633         spin_lock_init(&free_i->segmap_lock);
3634         return 0;
3635 }
3636
3637 static int build_curseg(struct f2fs_sb_info *sbi)
3638 {
3639         struct curseg_info *array;
3640         int i;
3641
3642         array = f2fs_kzalloc(sbi, array_size(NR_CURSEG_TYPE, sizeof(*array)),
3643                              GFP_KERNEL);
3644         if (!array)
3645                 return -ENOMEM;
3646
3647         SM_I(sbi)->curseg_array = array;
3648
3649         for (i = 0; i < NR_CURSEG_TYPE; i++) {
3650                 mutex_init(&array[i].curseg_mutex);
3651                 array[i].sum_blk = f2fs_kzalloc(sbi, PAGE_SIZE, GFP_KERNEL);
3652                 if (!array[i].sum_blk)
3653                         return -ENOMEM;
3654                 init_rwsem(&array[i].journal_rwsem);
3655                 array[i].journal = f2fs_kzalloc(sbi,
3656                                 sizeof(struct f2fs_journal), GFP_KERNEL);
3657                 if (!array[i].journal)
3658                         return -ENOMEM;
3659                 array[i].segno = NULL_SEGNO;
3660                 array[i].next_blkoff = 0;
3661         }
3662         return restore_curseg_summaries(sbi);
3663 }
3664
3665 static int build_sit_entries(struct f2fs_sb_info *sbi)
3666 {
3667         struct sit_info *sit_i = SIT_I(sbi);
3668         struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_COLD_DATA);
3669         struct f2fs_journal *journal = curseg->journal;
3670         struct seg_entry *se;
3671         struct f2fs_sit_entry sit;
3672         int sit_blk_cnt = SIT_BLK_CNT(sbi);
3673         unsigned int i, start, end;
3674         unsigned int readed, start_blk = 0;
3675         int err = 0;
3676         block_t total_node_blocks = 0;
3677
3678         do {
3679                 readed = f2fs_ra_meta_pages(sbi, start_blk, BIO_MAX_PAGES,
3680                                                         META_SIT, true);
3681
3682                 start = start_blk * sit_i->sents_per_block;
3683                 end = (start_blk + readed) * sit_i->sents_per_block;
3684
3685                 for (; start < end && start < MAIN_SEGS(sbi); start++) {
3686                         struct f2fs_sit_block *sit_blk;
3687                         struct page *page;
3688
3689                         se = &sit_i->sentries[start];
3690                         page = get_current_sit_page(sbi, start);
3691                         sit_blk = (struct f2fs_sit_block *)page_address(page);
3692                         sit = sit_blk->entries[SIT_ENTRY_OFFSET(sit_i, start)];
3693                         f2fs_put_page(page, 1);
3694
3695                         err = check_block_count(sbi, start, &sit);
3696                         if (err)
3697                                 return err;
3698                         seg_info_from_raw_sit(se, &sit);
3699                         if (IS_NODESEG(se->type))
3700                                 total_node_blocks += se->valid_blocks;
3701
3702                         /* build discard map only one time */
3703                         if (f2fs_discard_en(sbi)) {
3704                                 if (is_set_ckpt_flags(sbi, CP_TRIMMED_FLAG)) {
3705                                         memset(se->discard_map, 0xff,
3706                                                 SIT_VBLOCK_MAP_SIZE);
3707                                 } else {
3708                                         memcpy(se->discard_map,
3709                                                 se->cur_valid_map,
3710                                                 SIT_VBLOCK_MAP_SIZE);
3711                                         sbi->discard_blks +=
3712                                                 sbi->blocks_per_seg -
3713                                                 se->valid_blocks;
3714                                 }
3715                         }
3716
3717                         if (sbi->segs_per_sec > 1)
3718                                 get_sec_entry(sbi, start)->valid_blocks +=
3719                                                         se->valid_blocks;
3720                 }
3721                 start_blk += readed;
3722         } while (start_blk < sit_blk_cnt);
3723
3724         down_read(&curseg->journal_rwsem);
3725         for (i = 0; i < sits_in_cursum(journal); i++) {
3726                 unsigned int old_valid_blocks;
3727
3728                 start = le32_to_cpu(segno_in_journal(journal, i));
3729                 if (start >= MAIN_SEGS(sbi)) {
3730                         f2fs_msg(sbi->sb, KERN_ERR,
3731                                         "Wrong journal entry on segno %u",
3732                                         start);
3733                         set_sbi_flag(sbi, SBI_NEED_FSCK);
3734                         err = -EINVAL;
3735                         break;
3736                 }
3737
3738                 se = &sit_i->sentries[start];
3739                 sit = sit_in_journal(journal, i);
3740
3741                 old_valid_blocks = se->valid_blocks;
3742                 if (IS_NODESEG(se->type))
3743                         total_node_blocks -= old_valid_blocks;
3744
3745                 err = check_block_count(sbi, start, &sit);
3746                 if (err)
3747                         break;
3748                 seg_info_from_raw_sit(se, &sit);
3749                 if (IS_NODESEG(se->type))
3750                         total_node_blocks += se->valid_blocks;
3751
3752                 if (f2fs_discard_en(sbi)) {
3753                         if (is_set_ckpt_flags(sbi, CP_TRIMMED_FLAG)) {
3754                                 memset(se->discard_map, 0xff,
3755                                                         SIT_VBLOCK_MAP_SIZE);
3756                         } else {
3757                                 memcpy(se->discard_map, se->cur_valid_map,
3758                                                         SIT_VBLOCK_MAP_SIZE);
3759                                 sbi->discard_blks += old_valid_blocks;
3760                                 sbi->discard_blks -= se->valid_blocks;
3761                         }
3762                 }
3763
3764                 if (sbi->segs_per_sec > 1) {
3765                         get_sec_entry(sbi, start)->valid_blocks +=
3766                                                         se->valid_blocks;
3767                         get_sec_entry(sbi, start)->valid_blocks -=
3768                                                         old_valid_blocks;
3769                 }
3770         }
3771         up_read(&curseg->journal_rwsem);
3772
3773         if (!err && total_node_blocks != valid_node_count(sbi)) {
3774                 f2fs_msg(sbi->sb, KERN_ERR,
3775                         "SIT is corrupted node# %u vs %u",
3776                         total_node_blocks, valid_node_count(sbi));
3777                 set_sbi_flag(sbi, SBI_NEED_FSCK);
3778                 err = -EINVAL;
3779         }
3780
3781         return err;
3782 }
3783
3784 static void init_free_segmap(struct f2fs_sb_info *sbi)
3785 {
3786         unsigned int start;
3787         int type;
3788
3789         for (start = 0; start < MAIN_SEGS(sbi); start++) {
3790                 struct seg_entry *sentry = get_seg_entry(sbi, start);
3791                 if (!sentry->valid_blocks)
3792                         __set_free(sbi, start);
3793                 else
3794                         SIT_I(sbi)->written_valid_blocks +=
3795                                                 sentry->valid_blocks;
3796         }
3797
3798         /* set use the current segments */
3799         for (type = CURSEG_HOT_DATA; type <= CURSEG_COLD_NODE; type++) {
3800                 struct curseg_info *curseg_t = CURSEG_I(sbi, type);
3801                 __set_test_and_inuse(sbi, curseg_t->segno);
3802         }
3803 }
3804
3805 static void init_dirty_segmap(struct f2fs_sb_info *sbi)
3806 {
3807         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
3808         struct free_segmap_info *free_i = FREE_I(sbi);
3809         unsigned int segno = 0, offset = 0;
3810         unsigned short valid_blocks;
3811
3812         while (1) {
3813                 /* find dirty segment based on free segmap */
3814                 segno = find_next_inuse(free_i, MAIN_SEGS(sbi), offset);
3815                 if (segno >= MAIN_SEGS(sbi))
3816                         break;
3817                 offset = segno + 1;
3818                 valid_blocks = get_valid_blocks(sbi, segno, false);
3819                 if (valid_blocks == sbi->blocks_per_seg || !valid_blocks)
3820                         continue;
3821                 if (valid_blocks > sbi->blocks_per_seg) {
3822                         f2fs_bug_on(sbi, 1);
3823                         continue;
3824                 }
3825                 mutex_lock(&dirty_i->seglist_lock);
3826                 __locate_dirty_segment(sbi, segno, DIRTY);
3827                 mutex_unlock(&dirty_i->seglist_lock);
3828         }
3829 }
3830
3831 static int init_victim_secmap(struct f2fs_sb_info *sbi)
3832 {
3833         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
3834         unsigned int bitmap_size = f2fs_bitmap_size(MAIN_SECS(sbi));
3835
3836         dirty_i->victim_secmap = f2fs_kvzalloc(sbi, bitmap_size, GFP_KERNEL);
3837         if (!dirty_i->victim_secmap)
3838                 return -ENOMEM;
3839         return 0;
3840 }
3841
3842 static int build_dirty_segmap(struct f2fs_sb_info *sbi)
3843 {
3844         struct dirty_seglist_info *dirty_i;
3845         unsigned int bitmap_size, i;
3846
3847         /* allocate memory for dirty segments list information */
3848         dirty_i = f2fs_kzalloc(sbi, sizeof(struct dirty_seglist_info),
3849                                                                 GFP_KERNEL);
3850         if (!dirty_i)
3851                 return -ENOMEM;
3852
3853         SM_I(sbi)->dirty_info = dirty_i;
3854         mutex_init(&dirty_i->seglist_lock);
3855
3856         bitmap_size = f2fs_bitmap_size(MAIN_SEGS(sbi));
3857
3858         for (i = 0; i < NR_DIRTY_TYPE; i++) {
3859                 dirty_i->dirty_segmap[i] = f2fs_kvzalloc(sbi, bitmap_size,
3860                                                                 GFP_KERNEL);
3861                 if (!dirty_i->dirty_segmap[i])
3862                         return -ENOMEM;
3863         }
3864
3865         init_dirty_segmap(sbi);
3866         return init_victim_secmap(sbi);
3867 }
3868
3869 /*
3870  * Update min, max modified time for cost-benefit GC algorithm
3871  */
3872 static void init_min_max_mtime(struct f2fs_sb_info *sbi)
3873 {
3874         struct sit_info *sit_i = SIT_I(sbi);
3875         unsigned int segno;
3876
3877         down_write(&sit_i->sentry_lock);
3878
3879         sit_i->min_mtime = ULLONG_MAX;
3880
3881         for (segno = 0; segno < MAIN_SEGS(sbi); segno += sbi->segs_per_sec) {
3882                 unsigned int i;
3883                 unsigned long long mtime = 0;
3884
3885                 for (i = 0; i < sbi->segs_per_sec; i++)
3886                         mtime += get_seg_entry(sbi, segno + i)->mtime;
3887
3888                 mtime = div_u64(mtime, sbi->segs_per_sec);
3889
3890                 if (sit_i->min_mtime > mtime)
3891                         sit_i->min_mtime = mtime;
3892         }
3893         sit_i->max_mtime = get_mtime(sbi, false);
3894         up_write(&sit_i->sentry_lock);
3895 }
3896
3897 int f2fs_build_segment_manager(struct f2fs_sb_info *sbi)
3898 {
3899         struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
3900         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
3901         struct f2fs_sm_info *sm_info;
3902         int err;
3903
3904         sm_info = f2fs_kzalloc(sbi, sizeof(struct f2fs_sm_info), GFP_KERNEL);
3905         if (!sm_info)
3906                 return -ENOMEM;
3907
3908         /* init sm info */
3909         sbi->sm_info = sm_info;
3910         sm_info->seg0_blkaddr = le32_to_cpu(raw_super->segment0_blkaddr);
3911         sm_info->main_blkaddr = le32_to_cpu(raw_super->main_blkaddr);
3912         sm_info->segment_count = le32_to_cpu(raw_super->segment_count);
3913         sm_info->reserved_segments = le32_to_cpu(ckpt->rsvd_segment_count);
3914         sm_info->ovp_segments = le32_to_cpu(ckpt->overprov_segment_count);
3915         sm_info->main_segments = le32_to_cpu(raw_super->segment_count_main);
3916         sm_info->ssa_blkaddr = le32_to_cpu(raw_super->ssa_blkaddr);
3917         sm_info->rec_prefree_segments = sm_info->main_segments *
3918                                         DEF_RECLAIM_PREFREE_SEGMENTS / 100;
3919         if (sm_info->rec_prefree_segments > DEF_MAX_RECLAIM_PREFREE_SEGMENTS)
3920                 sm_info->rec_prefree_segments = DEF_MAX_RECLAIM_PREFREE_SEGMENTS;
3921
3922         if (!test_opt(sbi, LFS))
3923                 sm_info->ipu_policy = 1 << F2FS_IPU_FSYNC;
3924         sm_info->min_ipu_util = DEF_MIN_IPU_UTIL;
3925         sm_info->min_fsync_blocks = DEF_MIN_FSYNC_BLOCKS;
3926         sm_info->min_hot_blocks = DEF_MIN_HOT_BLOCKS;
3927         sm_info->min_ssr_sections = reserved_sections(sbi);
3928
3929         INIT_LIST_HEAD(&sm_info->sit_entry_set);
3930
3931         init_rwsem(&sm_info->curseg_lock);
3932
3933         if (!f2fs_readonly(sbi->sb)) {
3934                 err = f2fs_create_flush_cmd_control(sbi);
3935                 if (err)
3936                         return err;
3937         }
3938
3939         err = create_discard_cmd_control(sbi);
3940         if (err)
3941                 return err;
3942
3943         err = build_sit_info(sbi);
3944         if (err)
3945                 return err;
3946         err = build_free_segmap(sbi);
3947         if (err)
3948                 return err;
3949         err = build_curseg(sbi);
3950         if (err)
3951                 return err;
3952
3953         /* reinit free segmap based on SIT */
3954         err = build_sit_entries(sbi);
3955         if (err)
3956                 return err;
3957
3958         init_free_segmap(sbi);
3959         err = build_dirty_segmap(sbi);
3960         if (err)
3961                 return err;
3962
3963         init_min_max_mtime(sbi);
3964         return 0;
3965 }
3966
3967 static void discard_dirty_segmap(struct f2fs_sb_info *sbi,
3968                 enum dirty_type dirty_type)
3969 {
3970         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
3971
3972         mutex_lock(&dirty_i->seglist_lock);
3973         kvfree(dirty_i->dirty_segmap[dirty_type]);
3974         dirty_i->nr_dirty[dirty_type] = 0;
3975         mutex_unlock(&dirty_i->seglist_lock);
3976 }
3977
3978 static void destroy_victim_secmap(struct f2fs_sb_info *sbi)
3979 {
3980         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
3981         kvfree(dirty_i->victim_secmap);
3982 }
3983
3984 static void destroy_dirty_segmap(struct f2fs_sb_info *sbi)
3985 {
3986         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
3987         int i;
3988
3989         if (!dirty_i)
3990                 return;
3991
3992         /* discard pre-free/dirty segments list */
3993         for (i = 0; i < NR_DIRTY_TYPE; i++)
3994                 discard_dirty_segmap(sbi, i);
3995
3996         destroy_victim_secmap(sbi);
3997         SM_I(sbi)->dirty_info = NULL;
3998         kfree(dirty_i);
3999 }
4000
4001 static void destroy_curseg(struct f2fs_sb_info *sbi)
4002 {
4003         struct curseg_info *array = SM_I(sbi)->curseg_array;
4004         int i;
4005
4006         if (!array)
4007                 return;
4008         SM_I(sbi)->curseg_array = NULL;
4009         for (i = 0; i < NR_CURSEG_TYPE; i++) {
4010                 kfree(array[i].sum_blk);
4011                 kfree(array[i].journal);
4012         }
4013         kfree(array);
4014 }
4015
4016 static void destroy_free_segmap(struct f2fs_sb_info *sbi)
4017 {
4018         struct free_segmap_info *free_i = SM_I(sbi)->free_info;
4019         if (!free_i)
4020                 return;
4021         SM_I(sbi)->free_info = NULL;
4022         kvfree(free_i->free_segmap);
4023         kvfree(free_i->free_secmap);
4024         kfree(free_i);
4025 }
4026
4027 static void destroy_sit_info(struct f2fs_sb_info *sbi)
4028 {
4029         struct sit_info *sit_i = SIT_I(sbi);
4030         unsigned int start;
4031
4032         if (!sit_i)
4033                 return;
4034
4035         if (sit_i->sentries) {
4036                 for (start = 0; start < MAIN_SEGS(sbi); start++) {
4037                         kfree(sit_i->sentries[start].cur_valid_map);
4038 #ifdef CONFIG_F2FS_CHECK_FS
4039                         kfree(sit_i->sentries[start].cur_valid_map_mir);
4040 #endif
4041                         kfree(sit_i->sentries[start].ckpt_valid_map);
4042                         kfree(sit_i->sentries[start].discard_map);
4043                 }
4044         }
4045         kfree(sit_i->tmp_map);
4046
4047         kvfree(sit_i->sentries);
4048         kvfree(sit_i->sec_entries);
4049         kvfree(sit_i->dirty_sentries_bitmap);
4050
4051         SM_I(sbi)->sit_info = NULL;
4052         kfree(sit_i->sit_bitmap);
4053 #ifdef CONFIG_F2FS_CHECK_FS
4054         kfree(sit_i->sit_bitmap_mir);
4055 #endif
4056         kfree(sit_i);
4057 }
4058
4059 void f2fs_destroy_segment_manager(struct f2fs_sb_info *sbi)
4060 {
4061         struct f2fs_sm_info *sm_info = SM_I(sbi);
4062
4063         if (!sm_info)
4064                 return;
4065         f2fs_destroy_flush_cmd_control(sbi, true);
4066         destroy_discard_cmd_control(sbi);
4067         destroy_dirty_segmap(sbi);
4068         destroy_curseg(sbi);
4069         destroy_free_segmap(sbi);
4070         destroy_sit_info(sbi);
4071         sbi->sm_info = NULL;
4072         kfree(sm_info);
4073 }
4074
4075 int __init f2fs_create_segment_manager_caches(void)
4076 {
4077         discard_entry_slab = f2fs_kmem_cache_create("discard_entry",
4078                         sizeof(struct discard_entry));
4079         if (!discard_entry_slab)
4080                 goto fail;
4081
4082         discard_cmd_slab = f2fs_kmem_cache_create("discard_cmd",
4083                         sizeof(struct discard_cmd));
4084         if (!discard_cmd_slab)
4085                 goto destroy_discard_entry;
4086
4087         sit_entry_set_slab = f2fs_kmem_cache_create("sit_entry_set",
4088                         sizeof(struct sit_entry_set));
4089         if (!sit_entry_set_slab)
4090                 goto destroy_discard_cmd;
4091
4092         inmem_entry_slab = f2fs_kmem_cache_create("inmem_page_entry",
4093                         sizeof(struct inmem_pages));
4094         if (!inmem_entry_slab)
4095                 goto destroy_sit_entry_set;
4096         return 0;
4097
4098 destroy_sit_entry_set:
4099         kmem_cache_destroy(sit_entry_set_slab);
4100 destroy_discard_cmd:
4101         kmem_cache_destroy(discard_cmd_slab);
4102 destroy_discard_entry:
4103         kmem_cache_destroy(discard_entry_slab);
4104 fail:
4105         return -ENOMEM;
4106 }
4107
4108 void f2fs_destroy_segment_manager_caches(void)
4109 {
4110         kmem_cache_destroy(sit_entry_set_slab);
4111         kmem_cache_destroy(discard_cmd_slab);
4112         kmem_cache_destroy(discard_entry_slab);
4113         kmem_cache_destroy(inmem_entry_slab);
4114 }