Quelle  debug.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0
/*
 * f2fs debugging statistics
 *
 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
 *             http://www.samsung.com/
 * Copyright (c) 2012 Linux Foundation
 * Copyright (c) 2012 Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 */

#include <linux/fs.h>
#include <linux/backing-dev.h>
#include <linux/f2fs_fs.h>
#include <linux/blkdev.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>

#include "f2fs.h"
#include "node.h"
#include "segment.h"
#include "gc.h"

static LIST_HEAD(f2fs_stat_list);
static DEFINE_SPINLOCK(f2fs_stat_lock);
#ifdef CONFIG_DEBUG_FS
static struct dentry *f2fs_debugfs_root;
#endif

/*
 * This function calculates BDF of every segments
 */
void f2fs_update_sit_info(struct f2fs_sb_info *sbi)
{
 struct f2fs_stat_info *si = F2FS_STAT(sbi);
 unsigned long long blks_per_sec, hblks_per_sec, total_vblocks;
 unsigned long long bimodal, dist;
 unsigned int segno, vblocks;
 int ndirty = 0;

 bimodal = 0;
 total_vblocks = 0;
 blks_per_sec = CAP_BLKS_PER_SEC(sbi);
 hblks_per_sec = blks_per_sec / 2;
 for (segno = 0; segno < MAIN_SEGS(sbi); segno += SEGS_PER_SEC(sbi)) {
  vblocks = get_valid_blocks(sbi, segno, true);
  dist = abs(vblocks - hblks_per_sec);
  bimodal += dist * dist;

  if (vblocks > 0 && vblocks < blks_per_sec) {
   total_vblocks += vblocks;
   ndirty++;
  }
 }
 dist = div_u64(MAIN_SECS(sbi) * hblks_per_sec * hblks_per_sec, 100);
 si->bimodal = div64_u64(bimodal, dist);
 if (si->dirty_count)
  si->avg_vblocks = div_u64(total_vblocks, ndirty);
 else
  si->avg_vblocks = 0;
}

#ifdef CONFIG_DEBUG_FS
static void update_multidevice_stats(struct f2fs_sb_info *sbi)
{
 struct f2fs_stat_info *si = F2FS_STAT(sbi);
 struct f2fs_dev_stats *dev_stats = si->dev_stats;
 int i, j;

 if (!f2fs_is_multi_device(sbi))
  return;

 memset(dev_stats, 0, sizeof(struct f2fs_dev_stats) * sbi->s_ndevs);
 for (i = 0; i < sbi->s_ndevs; i++) {
  unsigned int start_segno, end_segno;
  block_t start_blk, end_blk;

  if (i == 0) {
   start_blk = MAIN_BLKADDR(sbi);
   end_blk = FDEV(i).end_blk + 1 - SEG0_BLKADDR(sbi);
  } else {
   start_blk = FDEV(i).start_blk;
   end_blk = FDEV(i).end_blk + 1;
  }

  start_segno = GET_SEGNO(sbi, start_blk);
  end_segno = GET_SEGNO(sbi, end_blk);

  for (j = start_segno; j < end_segno; j++) {
   unsigned int seg_blks, sec_blks;

   seg_blks = get_seg_entry(sbi, j)->valid_blocks;

   /* update segment stats */
   if (is_curseg(sbi, j))
    dev_stats[i].devstats[0][DEVSTAT_INUSE]++;
   else if (seg_blks == BLKS_PER_SEG(sbi))
    dev_stats[i].devstats[0][DEVSTAT_FULL]++;
   else if (seg_blks != 0)
    dev_stats[i].devstats[0][DEVSTAT_DIRTY]++;
   else if (!test_bit(j, FREE_I(sbi)->free_segmap))
    dev_stats[i].devstats[0][DEVSTAT_FREE]++;
   else
    dev_stats[i].devstats[0][DEVSTAT_PREFREE]++;

   if (!__is_large_section(sbi) ||
    (j % SEGS_PER_SEC(sbi)) != 0)
    continue;

   sec_blks = get_sec_entry(sbi, j)->valid_blocks;

   /* update section stats */
   if (is_cursec(sbi, GET_SEC_FROM_SEG(sbi, j)))
    dev_stats[i].devstats[1][DEVSTAT_INUSE]++;
   else if (sec_blks == BLKS_PER_SEC(sbi))
    dev_stats[i].devstats[1][DEVSTAT_FULL]++;
   else if (sec_blks != 0)
    dev_stats[i].devstats[1][DEVSTAT_DIRTY]++;
   else if (!test_bit(GET_SEC_FROM_SEG(sbi, j),
     FREE_I(sbi)->free_secmap))
    dev_stats[i].devstats[1][DEVSTAT_FREE]++;
   else
    dev_stats[i].devstats[1][DEVSTAT_PREFREE]++;
  }
 }
}

static void update_general_status(struct f2fs_sb_info *sbi)
{
 struct f2fs_stat_info *si = F2FS_STAT(sbi);
 struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
 int i;

 /* these will be changed if online resize is done */
 si->main_area_segs = le32_to_cpu(raw_super->segment_count_main);
 si->main_area_sections = le32_to_cpu(raw_super->section_count);
 si->main_area_zones = si->main_area_sections /
    le32_to_cpu(raw_super->secs_per_zone);

 /* general extent cache stats */
 for (i = 0; i < NR_EXTENT_CACHES; i++) {
  struct extent_tree_info *eti = &sbi->extent_tree[i];

  si->hit_cached[i] = atomic64_read(&sbi->read_hit_cached[i]);
  si->hit_rbtree[i] = atomic64_read(&sbi->read_hit_rbtree[i]);
  si->total_ext[i] = atomic64_read(&sbi->total_hit_ext[i]);
  si->hit_total[i] = si->hit_cached[i] + si->hit_rbtree[i];
  si->ext_tree[i] = atomic_read(&eti->total_ext_tree);
  si->zombie_tree[i] = atomic_read(&eti->total_zombie_tree);
  si->ext_node[i] = atomic_read(&eti->total_ext_node);
 }
 /* read extent_cache only */
 si->hit_largest = atomic64_read(&sbi->read_hit_largest);
 si->hit_total[EX_READ] += si->hit_largest;

 /* block age extent_cache only */
 si->allocated_data_blocks = atomic64_read(&sbi->allocated_data_blocks);

 /* validation check of the segment numbers */
 si->ndirty_node = get_pages(sbi, F2FS_DIRTY_NODES);
 si->ndirty_dent = get_pages(sbi, F2FS_DIRTY_DENTS);
 si->ndirty_meta = get_pages(sbi, F2FS_DIRTY_META);
 si->ndirty_data = get_pages(sbi, F2FS_DIRTY_DATA);
 si->ndirty_qdata = get_pages(sbi, F2FS_DIRTY_QDATA);
 si->ndirty_imeta = get_pages(sbi, F2FS_DIRTY_IMETA);
 si->ndirty_dirs = sbi->ndirty_inode[DIR_INODE];
 si->ndirty_files = sbi->ndirty_inode[FILE_INODE];
 si->ndonate_files = sbi->donate_files;
 si->nquota_files = sbi->nquota_files;
 si->ndirty_all = sbi->ndirty_inode[DIRTY_META];
 si->aw_cnt = atomic_read(&sbi->atomic_files);
 si->max_aw_cnt = atomic_read(&sbi->max_aw_cnt);
 si->nr_dio_read = get_pages(sbi, F2FS_DIO_READ);
 si->nr_dio_write = get_pages(sbi, F2FS_DIO_WRITE);
 si->nr_wb_cp_data = get_pages(sbi, F2FS_WB_CP_DATA);
 si->nr_wb_data = get_pages(sbi, F2FS_WB_DATA);
 si->nr_rd_data = get_pages(sbi, F2FS_RD_DATA);
 si->nr_rd_node = get_pages(sbi, F2FS_RD_NODE);
 si->nr_rd_meta = get_pages(sbi, F2FS_RD_META);
 if (SM_I(sbi)->fcc_info) {
  si->nr_flushed =
   atomic_read(&SM_I(sbi)->fcc_info->issued_flush);
  si->nr_flushing =
   atomic_read(&SM_I(sbi)->fcc_info->queued_flush);
  si->flush_list_empty =
   llist_empty(&SM_I(sbi)->fcc_info->issue_list);
 }
 if (SM_I(sbi)->dcc_info) {
  si->nr_discarded =
   atomic_read(&SM_I(sbi)->dcc_info->issued_discard);
  si->nr_discarding =
   atomic_read(&SM_I(sbi)->dcc_info->queued_discard);
  si->nr_discard_cmd =
   atomic_read(&SM_I(sbi)->dcc_info->discard_cmd_cnt);
  si->undiscard_blks = SM_I(sbi)->dcc_info->undiscard_blks;
 }
 si->nr_issued_ckpt = atomic_read(&sbi->cprc_info.issued_ckpt);
 si->nr_total_ckpt = atomic_read(&sbi->cprc_info.total_ckpt);
 si->nr_queued_ckpt = atomic_read(&sbi->cprc_info.queued_ckpt);
 spin_lock(&sbi->cprc_info.stat_lock);
 si->cur_ckpt_time = sbi->cprc_info.cur_time;
 si->peak_ckpt_time = sbi->cprc_info.peak_time;
 spin_unlock(&sbi->cprc_info.stat_lock);
 si->total_count = BLKS_TO_SEGS(sbi, (int)sbi->user_block_count);
 si->rsvd_segs = reserved_segments(sbi);
 si->overp_segs = overprovision_segments(sbi);
 si->valid_count = valid_user_blocks(sbi);
 si->discard_blks = discard_blocks(sbi);
 si->valid_node_count = valid_node_count(sbi);
 si->valid_inode_count = valid_inode_count(sbi);
 si->inline_xattr = atomic_read(&sbi->inline_xattr);
 si->inline_inode = atomic_read(&sbi->inline_inode);
 si->inline_dir = atomic_read(&sbi->inline_dir);
 si->compr_inode = atomic_read(&sbi->compr_inode);
 si->swapfile_inode = atomic_read(&sbi->swapfile_inode);
 si->compr_blocks = atomic64_read(&sbi->compr_blocks);
 si->append = sbi->im[APPEND_INO].ino_num;
 si->update = sbi->im[UPDATE_INO].ino_num;
 si->orphans = sbi->im[ORPHAN_INO].ino_num;
 si->utilization = utilization(sbi);

 si->free_segs = free_segments(sbi);
 si->free_secs = free_sections(sbi);
 si->prefree_count = prefree_segments(sbi);
 si->dirty_count = dirty_segments(sbi);
 if (sbi->node_inode)
  si->node_pages = NODE_MAPPING(sbi)->nrpages;
 if (sbi->meta_inode)
  si->meta_pages = META_MAPPING(sbi)->nrpages;
#ifdef CONFIG_F2FS_FS_COMPRESSION
 if (sbi->compress_inode) {
  si->compress_pages = COMPRESS_MAPPING(sbi)->nrpages;
  si->compress_page_hit = atomic_read(&sbi->compress_page_hit);
 }
#endif
 si->nats = NM_I(sbi)->nat_cnt[TOTAL_NAT];
 si->dirty_nats = NM_I(sbi)->nat_cnt[DIRTY_NAT];
 si->sits = MAIN_SEGS(sbi);
 si->dirty_sits = SIT_I(sbi)->dirty_sentries;
 si->free_nids = NM_I(sbi)->nid_cnt[FREE_NID];
 si->avail_nids = NM_I(sbi)->available_nids;
 si->alloc_nids = NM_I(sbi)->nid_cnt[PREALLOC_NID];
 si->io_skip_bggc = sbi->io_skip_bggc;
 si->other_skip_bggc = sbi->other_skip_bggc;
 si->util_free = (int)(BLKS_TO_SEGS(sbi, free_user_blocks(sbi)))
  * 100 / (int)(sbi->user_block_count >> sbi->log_blocks_per_seg)
  / 2;
 si->util_valid = (int)(BLKS_TO_SEGS(sbi, written_block_count(sbi)))
  * 100 / (int)(sbi->user_block_count >> sbi->log_blocks_per_seg)
  / 2;
 si->util_invalid = 50 - si->util_free - si->util_valid;
 for (i = CURSEG_HOT_DATA; i < NO_CHECK_TYPE; i++) {
  struct curseg_info *curseg = CURSEG_I(sbi, i);

  si->curseg[i] = curseg->segno;
  si->cursec[i] = GET_SEC_FROM_SEG(sbi, curseg->segno);
  si->curzone[i] = GET_ZONE_FROM_SEC(sbi, si->cursec[i]);
 }

 for (i = META_CP; i < META_MAX; i++)
  si->meta_count[i] = atomic_read(&sbi->meta_count[i]);

 for (i = 0; i < NO_CHECK_TYPE; i++) {
  si->dirty_seg[i] = 0;
  si->full_seg[i] = 0;
  si->valid_blks[i] = 0;
 }

 for (i = 0; i < MAIN_SEGS(sbi); i++) {
  int blks = get_seg_entry(sbi, i)->valid_blocks;
  int type = get_seg_entry(sbi, i)->type;

  if (!blks)
   continue;

  if (blks == BLKS_PER_SEG(sbi))
   si->full_seg[type]++;
  else
   si->dirty_seg[type]++;
  si->valid_blks[type] += blks;
 }

 update_multidevice_stats(sbi);

 for (i = 0; i < MAX_CALL_TYPE; i++)
  si->cp_call_count[i] = atomic_read(&sbi->cp_call_count[i]);

 for (i = 0; i < 2; i++) {
  si->segment_count[i] = sbi->segment_count[i];
  si->block_count[i] = sbi->block_count[i];
 }

 si->inplace_count = atomic_read(&sbi->inplace_count);
}

/*
 * This function calculates memory footprint.
 */
static void update_mem_info(struct f2fs_sb_info *sbi)
{
 struct f2fs_stat_info *si = F2FS_STAT(sbi);
 int i;

 if (si->base_mem)
  goto get_cache;

 /* build stat */
 si->base_mem = sizeof(struct f2fs_stat_info);

 /* build superblock */
 si->base_mem += sizeof(struct f2fs_sb_info) + sbi->sb->s_blocksize;
 si->base_mem += 2 * sizeof(struct f2fs_inode_info);
 si->base_mem += sizeof(*sbi->ckpt);

 /* build sm */
 si->base_mem += sizeof(struct f2fs_sm_info);

 /* build sit */
 si->base_mem += sizeof(struct sit_info);
 si->base_mem += MAIN_SEGS(sbi) * sizeof(struct seg_entry);
 si->base_mem += f2fs_bitmap_size(MAIN_SEGS(sbi));
 si->base_mem += 2 * SIT_VBLOCK_MAP_SIZE * MAIN_SEGS(sbi);
 si->base_mem += SIT_VBLOCK_MAP_SIZE * MAIN_SEGS(sbi);
 si->base_mem += SIT_VBLOCK_MAP_SIZE;
 if (__is_large_section(sbi))
  si->base_mem += MAIN_SECS(sbi) * sizeof(struct sec_entry);
 si->base_mem += __bitmap_size(sbi, SIT_BITMAP);

 /* build free segmap */
 si->base_mem += sizeof(struct free_segmap_info);
 si->base_mem += f2fs_bitmap_size(MAIN_SEGS(sbi));
 si->base_mem += f2fs_bitmap_size(MAIN_SECS(sbi));

 /* build curseg */
 si->base_mem += sizeof(struct curseg_info) * NR_CURSEG_TYPE;
 si->base_mem += PAGE_SIZE * NR_CURSEG_TYPE;

 /* build dirty segmap */
 si->base_mem += sizeof(struct dirty_seglist_info);
 si->base_mem += NR_DIRTY_TYPE * f2fs_bitmap_size(MAIN_SEGS(sbi));
 si->base_mem += f2fs_bitmap_size(MAIN_SECS(sbi));

 /* build nm */
 si->base_mem += sizeof(struct f2fs_nm_info);
 si->base_mem += __bitmap_size(sbi, NAT_BITMAP);
 si->base_mem += F2FS_BLK_TO_BYTES(NM_I(sbi)->nat_bits_blocks);
 si->base_mem += NM_I(sbi)->nat_blocks *
    f2fs_bitmap_size(NAT_ENTRY_PER_BLOCK);
 si->base_mem += NM_I(sbi)->nat_blocks / 8;
 si->base_mem += NM_I(sbi)->nat_blocks * sizeof(unsigned short);

get_cache:
 si->cache_mem = 0;

 /* build gc */
 if (sbi->gc_thread)
  si->cache_mem += sizeof(struct f2fs_gc_kthread);

 /* build merge flush thread */
 if (SM_I(sbi)->fcc_info)
  si->cache_mem += sizeof(struct flush_cmd_control);
 if (SM_I(sbi)->dcc_info) {
  si->cache_mem += sizeof(struct discard_cmd_control);
  si->cache_mem += sizeof(struct discard_cmd) *
   atomic_read(&SM_I(sbi)->dcc_info->discard_cmd_cnt);
 }

 /* free nids */
 si->cache_mem += (NM_I(sbi)->nid_cnt[FREE_NID] +
    NM_I(sbi)->nid_cnt[PREALLOC_NID]) *
    sizeof(struct free_nid);
 si->cache_mem += NM_I(sbi)->nat_cnt[TOTAL_NAT] *
    sizeof(struct nat_entry);
 si->cache_mem += NM_I(sbi)->nat_cnt[DIRTY_NAT] *
    sizeof(struct nat_entry_set);
 for (i = 0; i < MAX_INO_ENTRY; i++)
  si->cache_mem += sbi->im[i].ino_num * sizeof(struct ino_entry);

 for (i = 0; i < NR_EXTENT_CACHES; i++) {
  struct extent_tree_info *eti = &sbi->extent_tree[i];

  si->ext_mem[i] = atomic_read(&eti->total_ext_tree) *
      sizeof(struct extent_tree);
  si->ext_mem[i] += atomic_read(&eti->total_ext_node) *
      sizeof(struct extent_node);
  si->cache_mem += si->ext_mem[i];
 }

 si->page_mem = 0;
 if (sbi->node_inode) {
  unsigned long npages = NODE_MAPPING(sbi)->nrpages;

  si->page_mem += (unsigned long long)npages << PAGE_SHIFT;
 }
 if (sbi->meta_inode) {
  unsigned long npages = META_MAPPING(sbi)->nrpages;

  si->page_mem += (unsigned long long)npages << PAGE_SHIFT;
 }
#ifdef CONFIG_F2FS_FS_COMPRESSION
 if (sbi->compress_inode) {
  unsigned long npages = COMPRESS_MAPPING(sbi)->nrpages;

  si->page_mem += (unsigned long long)npages << PAGE_SHIFT;
 }
#endif
}

static const char *s_flag[MAX_SBI_FLAG] = {
 [SBI_IS_DIRTY]  = "fs_dirty",
 [SBI_IS_CLOSE]  = "closing",
 [SBI_NEED_FSCK]  = "need_fsck",
 [SBI_POR_DOING]  = "recovering",
 [SBI_NEED_SB_WRITE] = "sb_dirty",
 [SBI_NEED_CP]  = "need_cp",
 [SBI_IS_SHUTDOWN] = "shutdown",
 [SBI_IS_RECOVERED] = "recovered",
 [SBI_CP_DISABLED] = "cp_disabled",
 [SBI_CP_DISABLED_QUICK] = "cp_disabled_quick",
 [SBI_QUOTA_NEED_FLUSH] = "quota_need_flush",
 [SBI_QUOTA_SKIP_FLUSH] = "quota_skip_flush",
 [SBI_QUOTA_NEED_REPAIR] = "quota_need_repair",
 [SBI_IS_RESIZEFS] = "resizefs",
 [SBI_IS_FREEZING] = "freezefs",
 [SBI_IS_WRITABLE] = "writable",
};

static const char *ipu_mode_names[F2FS_IPU_MAX] = {
 [F2FS_IPU_FORCE] = "FORCE",
 [F2FS_IPU_SSR]  = "SSR",
 [F2FS_IPU_UTIL]  = "UTIL",
 [F2FS_IPU_SSR_UTIL] = "SSR_UTIL",
 [F2FS_IPU_FSYNC] = "FSYNC",
 [F2FS_IPU_ASYNC] = "ASYNC",
 [F2FS_IPU_NOCACHE] = "NOCACHE",
 [F2FS_IPU_HONOR_OPU_WRITE] = "HONOR_OPU_WRITE",
};

static int stat_show(struct seq_file *s, void *v)
{
 struct f2fs_stat_info *si;
 int i = 0, j = 0;

 spin_lock(&f2fs_stat_lock);
 list_for_each_entry(si, &f2fs_stat_list, stat_list) {
  struct f2fs_sb_info *sbi = si->sbi;

  update_general_status(sbi);

  seq_printf(s, "\n=====[ partition info(%pg). #%d, %s, CP: %s]=====\n",
   sbi->sb->s_bdev, i++,
   f2fs_readonly(sbi->sb) ? "RO" : "RW",
   is_set_ckpt_flags(sbi, CP_DISABLED_FLAG) ?
   "Disabled" : (f2fs_cp_error(sbi) ? "Error" : "Good"));
  if (sbi->s_flag) {
   seq_puts(s, "[SBI:");
   for_each_set_bit(j, &sbi->s_flag, MAX_SBI_FLAG)
    seq_printf(s, " %s", s_flag[j]);
   seq_puts(s, "]\n");
  }
  seq_printf(s, "[SB: 1] [CP: 2] [SIT: %d] [NAT: %d] ",
      si->sit_area_segs, si->nat_area_segs);
  seq_printf(s, "[SSA: %d] [MAIN: %d",
      si->ssa_area_segs, si->main_area_segs);
  seq_printf(s, "(OverProv:%d Resv:%d)]\n\n",
      si->overp_segs, si->rsvd_segs);
  seq_printf(s, "Current Time Sec: %llu / Mounted Time Sec: %llu\n\n",
     ktime_get_boottime_seconds(),
     SIT_I(sbi)->mounted_time);

  seq_puts(s, "Policy:\n");
  seq_puts(s, " - IPU: [");
  if (IS_F2FS_IPU_DISABLE(sbi)) {
   seq_puts(s, " DISABLE");
  } else {
   unsigned long policy = SM_I(sbi)->ipu_policy;

   for_each_set_bit(j, &policy, F2FS_IPU_MAX)
    seq_printf(s, " %s", ipu_mode_names[j]);
  }
  seq_puts(s, " ]\n\n");

  if (test_opt(sbi, DISCARD))
   seq_printf(s, "Utilization: %u%% (%u valid blocks, %u discard blocks)\n",
    si->utilization, si->valid_count, si->discard_blks);
  else
   seq_printf(s, "Utilization: %u%% (%u valid blocks)\n",
    si->utilization, si->valid_count);

  seq_printf(s, " - Node: %u (Inode: %u, ",
      si->valid_node_count, si->valid_inode_count);
  seq_printf(s, "Other: %u)\n - Data: %u\n",
      si->valid_node_count - si->valid_inode_count,
      si->valid_count - si->valid_node_count);
  seq_printf(s, " - Inline_xattr Inode: %u\n",
      si->inline_xattr);
  seq_printf(s, " - Inline_data Inode: %u\n",
      si->inline_inode);
  seq_printf(s, " - Inline_dentry Inode: %u\n",
      si->inline_dir);
  seq_printf(s, " - Compressed Inode: %u, Blocks: %llu\n",
      si->compr_inode, si->compr_blocks);
  seq_printf(s, " - Swapfile Inode: %u\n",
      si->swapfile_inode);
  seq_printf(s, " - Donate Inode: %u\n",
      si->ndonate_files);
  seq_printf(s, " - Orphan/Append/Update Inode: %u, %u, %u\n",
      si->orphans, si->append, si->update);
  seq_printf(s, "\nMain area: %d segs, %d secs %d zones\n",
      si->main_area_segs, si->main_area_sections,
      si->main_area_zones);
  seq_printf(s, " TYPE %8s %8s %8s %10s %10s %10s\n",
      "segno", "secno", "zoneno", "dirty_seg", "full_seg", "valid_blk");
  seq_printf(s, " - COLD data: %8d %8d %8d %10u %10u %10u\n",
      si->curseg[CURSEG_COLD_DATA],
      si->cursec[CURSEG_COLD_DATA],
      si->curzone[CURSEG_COLD_DATA],
      si->dirty_seg[CURSEG_COLD_DATA],
      si->full_seg[CURSEG_COLD_DATA],
      si->valid_blks[CURSEG_COLD_DATA]);
  seq_printf(s, " - WARM data: %8d %8d %8d %10u %10u %10u\n",
      si->curseg[CURSEG_WARM_DATA],
      si->cursec[CURSEG_WARM_DATA],
      si->curzone[CURSEG_WARM_DATA],
      si->dirty_seg[CURSEG_WARM_DATA],
      si->full_seg[CURSEG_WARM_DATA],
      si->valid_blks[CURSEG_WARM_DATA]);
  seq_printf(s, " - HOT data: %8d %8d %8d %10u %10u %10u\n",
      si->curseg[CURSEG_HOT_DATA],
      si->cursec[CURSEG_HOT_DATA],
      si->curzone[CURSEG_HOT_DATA],
      si->dirty_seg[CURSEG_HOT_DATA],
      si->full_seg[CURSEG_HOT_DATA],
      si->valid_blks[CURSEG_HOT_DATA]);
  seq_printf(s, " - Dir dnode: %8d %8d %8d %10u %10u %10u\n",
      si->curseg[CURSEG_HOT_NODE],
      si->cursec[CURSEG_HOT_NODE],
      si->curzone[CURSEG_HOT_NODE],
      si->dirty_seg[CURSEG_HOT_NODE],
      si->full_seg[CURSEG_HOT_NODE],
      si->valid_blks[CURSEG_HOT_NODE]);
  seq_printf(s, " - File dnode: %8d %8d %8d %10u %10u %10u\n",
      si->curseg[CURSEG_WARM_NODE],
      si->cursec[CURSEG_WARM_NODE],
      si->curzone[CURSEG_WARM_NODE],
      si->dirty_seg[CURSEG_WARM_NODE],
      si->full_seg[CURSEG_WARM_NODE],
      si->valid_blks[CURSEG_WARM_NODE]);
  seq_printf(s, " - Indir nodes: %8d %8d %8d %10u %10u %10u\n",
      si->curseg[CURSEG_COLD_NODE],
      si->cursec[CURSEG_COLD_NODE],
      si->curzone[CURSEG_COLD_NODE],
      si->dirty_seg[CURSEG_COLD_NODE],
      si->full_seg[CURSEG_COLD_NODE],
      si->valid_blks[CURSEG_COLD_NODE]);
  seq_printf(s, " - Pinned file: %8d %8d %8d\n",
      si->curseg[CURSEG_COLD_DATA_PINNED],
      si->cursec[CURSEG_COLD_DATA_PINNED],
      si->curzone[CURSEG_COLD_DATA_PINNED]);
  seq_printf(s, " - ATGC data: %8d %8d %8d\n",
      si->curseg[CURSEG_ALL_DATA_ATGC],
      si->cursec[CURSEG_ALL_DATA_ATGC],
      si->curzone[CURSEG_ALL_DATA_ATGC]);
  seq_printf(s, "\n - Valid: %d\n - Dirty: %d\n",
      si->main_area_segs - si->dirty_count -
      si->prefree_count - si->free_segs,
      si->dirty_count);
  seq_printf(s, " - Prefree: %d\n - Free: %d (%d)\n\n",
      si->prefree_count, si->free_segs, si->free_secs);
  if (f2fs_is_multi_device(sbi)) {
   seq_puts(s, "Multidevice stats:\n");
   seq_printf(s, " [seg: %8s %8s %8s %8s %8s]",
     "inuse", "dirty", "full", "free", "prefree");
   if (__is_large_section(sbi))
    seq_printf(s, " [sec: %8s %8s %8s %8s %8s]\n",
     "inuse", "dirty", "full", "free", "prefree");
   else
    seq_puts(s, "\n");

   for (i = 0; i < sbi->s_ndevs; i++) {
    seq_printf(s, " #%-2d %8u %8u %8u %8u %8u", i,
     si->dev_stats[i].devstats[0][DEVSTAT_INUSE],
     si->dev_stats[i].devstats[0][DEVSTAT_DIRTY],
     si->dev_stats[i].devstats[0][DEVSTAT_FULL],
     si->dev_stats[i].devstats[0][DEVSTAT_FREE],
     si->dev_stats[i].devstats[0][DEVSTAT_PREFREE]);
    if (!__is_large_section(sbi)) {
     seq_puts(s, "\n");
     continue;
    }
    seq_printf(s, " %8u %8u %8u %8u %8u\n",
     si->dev_stats[i].devstats[1][DEVSTAT_INUSE],
     si->dev_stats[i].devstats[1][DEVSTAT_DIRTY],
     si->dev_stats[i].devstats[1][DEVSTAT_FULL],
     si->dev_stats[i].devstats[1][DEVSTAT_FREE],
     si->dev_stats[i].devstats[1][DEVSTAT_PREFREE]);
   }
   seq_puts(s, "\n");
  }
  seq_printf(s, "CP calls: %d (BG: %d)\n",
      si->cp_call_count[TOTAL_CALL],
      si->cp_call_count[BACKGROUND]);
  seq_printf(s, "CP count: %d\n", si->cp_count);
  seq_printf(s, " - cp blocks : %u\n", si->meta_count[META_CP]);
  seq_printf(s, " - sit blocks : %u\n",
    si->meta_count[META_SIT]);
  seq_printf(s, " - nat blocks : %u\n",
    si->meta_count[META_NAT]);
  seq_printf(s, " - ssa blocks : %u\n",
    si->meta_count[META_SSA]);
  seq_puts(s, "CP merge:\n");
  seq_printf(s, " - Queued : %4d\n", si->nr_queued_ckpt);
  seq_printf(s, " - Issued : %4d\n", si->nr_issued_ckpt);
  seq_printf(s, " - Total : %4d\n", si->nr_total_ckpt);
  seq_printf(s, " - Cur time : %4d(ms)\n", si->cur_ckpt_time);
  seq_printf(s, " - Peak time : %4d(ms)\n", si->peak_ckpt_time);
  seq_printf(s, "GC calls: %d (gc_thread: %d)\n",
      si->gc_call_count[BACKGROUND] +
      si->gc_call_count[FOREGROUND],
      si->gc_call_count[BACKGROUND]);
  if (__is_large_section(sbi)) {
   seq_printf(s, " - data sections : %d (BG: %d)\n",
     si->gc_secs[DATA][BG_GC] + si->gc_secs[DATA][FG_GC],
     si->gc_secs[DATA][BG_GC]);
   seq_printf(s, " - node sections : %d (BG: %d)\n",
     si->gc_secs[NODE][BG_GC] + si->gc_secs[NODE][FG_GC],
     si->gc_secs[NODE][BG_GC]);
  }
  seq_printf(s, " - data segments : %d (BG: %d)\n",
    si->gc_segs[DATA][BG_GC] + si->gc_segs[DATA][FG_GC],
    si->gc_segs[DATA][BG_GC]);
  seq_printf(s, " - node segments : %d (BG: %d)\n",
    si->gc_segs[NODE][BG_GC] + si->gc_segs[NODE][FG_GC],
    si->gc_segs[NODE][BG_GC]);
  seq_puts(s, " - Reclaimed segs :\n");
  seq_printf(s, " - Normal : %d\n", sbi->gc_reclaimed_segs[GC_NORMAL]);
  seq_printf(s, " - Idle CB : %d\n", sbi->gc_reclaimed_segs[GC_IDLE_CB]);
  seq_printf(s, " - Idle Greedy : %d\n",
    sbi->gc_reclaimed_segs[GC_IDLE_GREEDY]);
  seq_printf(s, " - Idle AT : %d\n", sbi->gc_reclaimed_segs[GC_IDLE_AT]);
  seq_printf(s, " - Urgent High : %d\n",
    sbi->gc_reclaimed_segs[GC_URGENT_HIGH]);
  seq_printf(s, " - Urgent Mid : %d\n", sbi->gc_reclaimed_segs[GC_URGENT_MID]);
  seq_printf(s, " - Urgent Low : %d\n", sbi->gc_reclaimed_segs[GC_URGENT_LOW]);
  seq_printf(s, "Try to move %d blocks (BG: %d)\n", si->tot_blks,
    si->bg_data_blks + si->bg_node_blks);
  seq_printf(s, " - data blocks : %d (%d)\n", si->data_blks,
    si->bg_data_blks);
  seq_printf(s, " - node blocks : %d (%d)\n", si->node_blks,
    si->bg_node_blks);
  seq_printf(s, "BG skip : IO: %u, Other: %u\n",
    si->io_skip_bggc, si->other_skip_bggc);
  seq_puts(s, "\nExtent Cache (Read):\n");
  seq_printf(s, " - Hit Count: L1-1:%llu L1-2:%llu L2:%llu\n",
    si->hit_largest, si->hit_cached[EX_READ],
    si->hit_rbtree[EX_READ]);
  seq_printf(s, " - Hit Ratio: %llu%% (%llu / %llu)\n",
    !si->total_ext[EX_READ] ? 0 :
    div64_u64(si->hit_total[EX_READ] * 100,
    si->total_ext[EX_READ]),
    si->hit_total[EX_READ], si->total_ext[EX_READ]);
  seq_printf(s, " - Inner Struct Count: tree: %d(%d), node: %d\n",
    si->ext_tree[EX_READ], si->zombie_tree[EX_READ],
    si->ext_node[EX_READ]);
  seq_puts(s, "\nExtent Cache (Block Age):\n");
  seq_printf(s, " - Allocated Data Blocks: %llu\n",
    si->allocated_data_blocks);
  seq_printf(s, " - Hit Count: L1:%llu L2:%llu\n",
    si->hit_cached[EX_BLOCK_AGE],
    si->hit_rbtree[EX_BLOCK_AGE]);
  seq_printf(s, " - Hit Ratio: %llu%% (%llu / %llu)\n",
    !si->total_ext[EX_BLOCK_AGE] ? 0 :
    div64_u64(si->hit_total[EX_BLOCK_AGE] * 100,
    si->total_ext[EX_BLOCK_AGE]),
    si->hit_total[EX_BLOCK_AGE],
    si->total_ext[EX_BLOCK_AGE]);
  seq_printf(s, " - Inner Struct Count: tree: %d(%d), node: %d\n",
    si->ext_tree[EX_BLOCK_AGE],
    si->zombie_tree[EX_BLOCK_AGE],
    si->ext_node[EX_BLOCK_AGE]);
  seq_puts(s, "\nBalancing F2FS Async:\n");
  seq_printf(s, " - DIO (R: %4d, W: %4d)\n",
      si->nr_dio_read, si->nr_dio_write);
  seq_printf(s, " - IO_R (Data: %4d, Node: %4d, Meta: %4d\n",
      si->nr_rd_data, si->nr_rd_node, si->nr_rd_meta);
  seq_printf(s, " - IO_W (CP: %4d, Data: %4d, Flush: (%4d %4d %4d), ",
      si->nr_wb_cp_data, si->nr_wb_data,
      si->nr_flushing, si->nr_flushed,
      si->flush_list_empty);
  seq_printf(s, "Discard: (%4d %4d)) cmd: %4d undiscard:%4u\n",
      si->nr_discarding, si->nr_discarded,
      si->nr_discard_cmd, si->undiscard_blks);
  seq_printf(s, " - atomic IO: %4d (Max. %4d)\n",
      si->aw_cnt, si->max_aw_cnt);
  seq_printf(s, " - compress: %4d, hit:%8d\n", si->compress_pages, si->compress_page_hit);
  seq_printf(s, " - nodes: %4d in %4d\n",
      si->ndirty_node, si->node_pages);
  seq_printf(s, " - dents: %4d in dirs:%4d (%4d)\n",
      si->ndirty_dent, si->ndirty_dirs, si->ndirty_all);
  seq_printf(s, " - data: %4d in files:%4d\n",
      si->ndirty_data, si->ndirty_files);
  seq_printf(s, " - quota data: %4d in quota files:%4d\n",
      si->ndirty_qdata, si->nquota_files);
  seq_printf(s, " - meta: %4d in %4d\n",
      si->ndirty_meta, si->meta_pages);
  seq_printf(s, " - imeta: %4d\n",
      si->ndirty_imeta);
  seq_printf(s, " - fsync mark: %4lld\n",
      percpu_counter_sum_positive(
     &sbi->rf_node_block_count));
  seq_printf(s, " - NATs: %9d/%9d\n - SITs: %9d/%9d\n",
      si->dirty_nats, si->nats, si->dirty_sits, si->sits);
  seq_printf(s, " - free_nids: %9d/%9d\n - alloc_nids: %9d\n",
      si->free_nids, si->avail_nids, si->alloc_nids);
  seq_puts(s, "\nDistribution of User Blocks:");
  seq_puts(s, " [ valid | invalid | free ]\n");
  seq_puts(s, " [");

  for (j = 0; j < si->util_valid; j++)
   seq_putc(s, '-');
  seq_putc(s, '|');

  for (j = 0; j < si->util_invalid; j++)
   seq_putc(s, '-');
  seq_putc(s, '|');

  for (j = 0; j < si->util_free; j++)
   seq_putc(s, '-');
  seq_puts(s, "]\n\n");
  seq_printf(s, "IPU: %u blocks\n", si->inplace_count);
  seq_printf(s, "SSR: %u blocks in %u segments\n",
      si->block_count[SSR], si->segment_count[SSR]);
  seq_printf(s, "LFS: %u blocks in %u segments\n",
      si->block_count[LFS], si->segment_count[LFS]);

  /* segment usage info */
  f2fs_update_sit_info(sbi);
  seq_printf(s, "\nBDF: %u, avg. vblocks: %u\n",
      si->bimodal, si->avg_vblocks);

  /* memory footprint */
  update_mem_info(sbi);
  seq_printf(s, "\nMemory: %llu KB\n",
   (si->base_mem + si->cache_mem + si->page_mem) >> 10);
  seq_printf(s, " - static: %llu KB\n",
    si->base_mem >> 10);
  seq_printf(s, " - cached all: %llu KB\n",
    si->cache_mem >> 10);
  seq_printf(s, " - read extent cache: %llu KB\n",
    si->ext_mem[EX_READ] >> 10);
  seq_printf(s, " - block age extent cache: %llu KB\n",
    si->ext_mem[EX_BLOCK_AGE] >> 10);
  seq_printf(s, " - paged : %llu KB\n",
    si->page_mem >> 10);
 }
 spin_unlock(&f2fs_stat_lock);
 return 0;
}

DEFINE_SHOW_ATTRIBUTE(stat);
#endif

int f2fs_build_stats(struct f2fs_sb_info *sbi)
{
 struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
 struct f2fs_stat_info *si;
 struct f2fs_dev_stats *dev_stats;
 int i;

 si = f2fs_kzalloc(sbi, sizeof(struct f2fs_stat_info), GFP_KERNEL);
 if (!si)
  return -ENOMEM;

 dev_stats = f2fs_kzalloc(sbi, sizeof(struct f2fs_dev_stats) *
      sbi->s_ndevs, GFP_KERNEL);
 if (!dev_stats) {
  kfree(si);
  return -ENOMEM;
 }

 si->dev_stats = dev_stats;

 si->all_area_segs = le32_to_cpu(raw_super->segment_count);
 si->sit_area_segs = le32_to_cpu(raw_super->segment_count_sit);
 si->nat_area_segs = le32_to_cpu(raw_super->segment_count_nat);
 si->ssa_area_segs = le32_to_cpu(raw_super->segment_count_ssa);
 si->main_area_segs = le32_to_cpu(raw_super->segment_count_main);
 si->main_area_sections = le32_to_cpu(raw_super->section_count);
 si->main_area_zones = si->main_area_sections /
    le32_to_cpu(raw_super->secs_per_zone);
 si->sbi = sbi;
 sbi->stat_info = si;

 /* general extent cache stats */
 for (i = 0; i < NR_EXTENT_CACHES; i++) {
  atomic64_set(&sbi->total_hit_ext[i], 0);
  atomic64_set(&sbi->read_hit_rbtree[i], 0);
  atomic64_set(&sbi->read_hit_cached[i], 0);
 }

 /* read extent_cache only */
 atomic64_set(&sbi->read_hit_largest, 0);

 atomic_set(&sbi->inline_xattr, 0);
 atomic_set(&sbi->inline_inode, 0);
 atomic_set(&sbi->inline_dir, 0);
 atomic_set(&sbi->compr_inode, 0);
 atomic64_set(&sbi->compr_blocks, 0);
 atomic_set(&sbi->swapfile_inode, 0);
 atomic_set(&sbi->atomic_files, 0);
 atomic_set(&sbi->inplace_count, 0);
 for (i = META_CP; i < META_MAX; i++)
  atomic_set(&sbi->meta_count[i], 0);
 for (i = 0; i < MAX_CALL_TYPE; i++)
  atomic_set(&sbi->cp_call_count[i], 0);

 atomic_set(&sbi->max_aw_cnt, 0);

 spin_lock(&f2fs_stat_lock);
 list_add_tail(&si->stat_list, &f2fs_stat_list);
 spin_unlock(&f2fs_stat_lock);

 return 0;
}

void f2fs_destroy_stats(struct f2fs_sb_info *sbi)
{
 struct f2fs_stat_info *si = F2FS_STAT(sbi);

 spin_lock(&f2fs_stat_lock);
 list_del(&si->stat_list);
 spin_unlock(&f2fs_stat_lock);

 kfree(si->dev_stats);
 kfree(si);
}

void __init f2fs_create_root_stats(void)
{
#ifdef CONFIG_DEBUG_FS
 f2fs_debugfs_root = debugfs_create_dir("f2fs", NULL);

 debugfs_create_file("status", 0444, f2fs_debugfs_root, NULL,
       &stat_fops);
#endif
}

void f2fs_destroy_root_stats(void)
{
#ifdef CONFIG_DEBUG_FS
 debugfs_remove_recursive(f2fs_debugfs_root);
 f2fs_debugfs_root = NULL;
#endif
}