fs/f2fs/debug.c

   1 /*
   2  * f2fs debugging statistics
   3  *
   4  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   5  *             http://www.samsung.com/
   6  * Copyright (c) 2012 Linux Foundation
   7  * Copyright (c) 2012 Greg Kroah-Hartman <gregkh@linuxfoundation.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/fs.h>
  15 #include <linux/backing-dev.h>
  16 #include <linux/f2fs_fs.h>
  17 #include <linux/blkdev.h>
  18 #include <linux/debugfs.h>
  19 #include <linux/seq_file.h>
  20
  21 #include "f2fs.h"
  22 #include "node.h"
  23 #include "segment.h"
  24 #include "gc.h"
  25
  26 static LIST_HEAD(f2fs_stat_list);
  27 static struct dentry *f2fs_debugfs_root;
  28 static DEFINE_MUTEX(f2fs_stat_mutex);
  29
  30 static void update_general_status(struct f2fs_sb_info *sbi)
  31 {
  32         struct f2fs_stat_info *si = F2FS_STAT(sbi);
  33         int i;
  34
  35         /* validation check of the segment numbers */
  36         si->hit_largest = atomic64_read(&sbi->read_hit_largest);
  37         si->hit_cached = atomic64_read(&sbi->read_hit_cached);
  38         si->hit_rbtree = atomic64_read(&sbi->read_hit_rbtree);
  39         si->hit_total = si->hit_largest + si->hit_cached + si->hit_rbtree;
  40         si->total_ext = atomic64_read(&sbi->total_hit_ext);
  41         si->ext_tree = atomic_read(&sbi->total_ext_tree);
  42         si->zombie_tree = atomic_read(&sbi->total_zombie_tree);
  43         si->ext_node = atomic_read(&sbi->total_ext_node);
  44         si->ndirty_node = get_pages(sbi, F2FS_DIRTY_NODES);
  45         si->ndirty_dent = get_pages(sbi, F2FS_DIRTY_DENTS);
  46         si->ndirty_meta = get_pages(sbi, F2FS_DIRTY_META);
  47         si->ndirty_data = get_pages(sbi, F2FS_DIRTY_DATA);
  48         si->ndirty_qdata = get_pages(sbi, F2FS_DIRTY_QDATA);
  49         si->ndirty_imeta = get_pages(sbi, F2FS_DIRTY_IMETA);
  50         si->ndirty_dirs = sbi->ndirty_inode[DIR_INODE];
  51         si->ndirty_files = sbi->ndirty_inode[FILE_INODE];
  52
  53         si->nquota_files = 0;
  54         if (f2fs_sb_has_quota_ino(sbi->sb)) {
  55                 for (i = 0; i < MAXQUOTAS; i++) {
  56                         if (f2fs_qf_ino(sbi->sb, i))
  57                                 si->nquota_files++;
  58                 }
  59         }
  60         si->ndirty_all = sbi->ndirty_inode[DIRTY_META];
  61         si->inmem_pages = get_pages(sbi, F2FS_INMEM_PAGES);
  62         si->aw_cnt = atomic_read(&sbi->aw_cnt);
  63         si->vw_cnt = atomic_read(&sbi->vw_cnt);
  64         si->max_aw_cnt = atomic_read(&sbi->max_aw_cnt);
  65         si->max_vw_cnt = atomic_read(&sbi->max_vw_cnt);
  66         si->nr_wb_cp_data = get_pages(sbi, F2FS_WB_CP_DATA);
  67         si->nr_wb_data = get_pages(sbi, F2FS_WB_DATA);
  68         if (SM_I(sbi) && SM_I(sbi)->fcc_info) {
  69                 si->nr_flushed =
  70                         atomic_read(&SM_I(sbi)->fcc_info->issued_flush);
  71                 si->nr_flushing =
  72                         atomic_read(&SM_I(sbi)->fcc_info->issing_flush);
  73                 si->flush_list_empty =
  74                         llist_empty(&SM_I(sbi)->fcc_info->issue_list);
  75         }
  76         if (SM_I(sbi) && SM_I(sbi)->dcc_info) {
  77                 si->nr_discarded =
  78                         atomic_read(&SM_I(sbi)->dcc_info->issued_discard);
  79                 si->nr_discarding =
  80                         atomic_read(&SM_I(sbi)->dcc_info->issing_discard);
  81                 si->nr_discard_cmd =
  82                         atomic_read(&SM_I(sbi)->dcc_info->discard_cmd_cnt);
  83                 si->undiscard_blks = SM_I(sbi)->dcc_info->undiscard_blks;
  84         }
  85         si->total_count = (int)sbi->user_block_count / sbi->blocks_per_seg;
  86         si->rsvd_segs = reserved_segments(sbi);
  87         si->overp_segs = overprovision_segments(sbi);
  88         si->valid_count = valid_user_blocks(sbi);
  89         si->discard_blks = discard_blocks(sbi);
  90         si->valid_node_count = valid_node_count(sbi);
  91         si->valid_inode_count = valid_inode_count(sbi);
  92         si->inline_xattr = atomic_read(&sbi->inline_xattr);
  93         si->inline_inode = atomic_read(&sbi->inline_inode);
  94         si->inline_dir = atomic_read(&sbi->inline_dir);
  95         si->append = sbi->im[APPEND_INO].ino_num;
  96         si->update = sbi->im[UPDATE_INO].ino_num;
  97         si->orphans = sbi->im[ORPHAN_INO].ino_num;
  98         si->utilization = utilization(sbi);
  99
 100         si->free_segs = free_segments(sbi);
 101         si->free_secs = free_sections(sbi);
 102         si->prefree_count = prefree_segments(sbi);
 103         si->dirty_count = dirty_segments(sbi);
 104         si->node_pages = NODE_MAPPING(sbi)->nrpages;
 105         si->meta_pages = META_MAPPING(sbi)->nrpages;
 106         si->nats = NM_I(sbi)->nat_cnt;
 107         si->dirty_nats = NM_I(sbi)->dirty_nat_cnt;
 108         si->sits = MAIN_SEGS(sbi);
 109         si->dirty_sits = SIT_I(sbi)->dirty_sentries;
 110         si->free_nids = NM_I(sbi)->nid_cnt[FREE_NID];
 111         si->avail_nids = NM_I(sbi)->available_nids;
 112         si->alloc_nids = NM_I(sbi)->nid_cnt[PREALLOC_NID];
 113         si->bg_gc = sbi->bg_gc;
 114         si->util_free = (int)(free_user_blocks(sbi) >> sbi->log_blocks_per_seg)
 115                 * 100 / (int)(sbi->user_block_count >> sbi->log_blocks_per_seg)
 116                 / 2;
 117         si->util_valid = (int)(written_block_count(sbi) >>
 118                                                 sbi->log_blocks_per_seg)
 119                 * 100 / (int)(sbi->user_block_count >> sbi->log_blocks_per_seg)
 120                 / 2;
 121         si->util_invalid = 50 - si->util_free - si->util_valid;
 122         for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_NODE; i++) {
 123                 struct curseg_info *curseg = CURSEG_I(sbi, i);
 124                 si->curseg[i] = curseg->segno;
 125                 si->cursec[i] = GET_SEC_FROM_SEG(sbi, curseg->segno);
 126                 si->curzone[i] = GET_ZONE_FROM_SEC(sbi, si->cursec[i]);
 127         }
 128
 129         for (i = 0; i < 2; i++) {
 130                 si->segment_count[i] = sbi->segment_count[i];
 131                 si->block_count[i] = sbi->block_count[i];
 132         }
 133
 134         si->inplace_count = atomic_read(&sbi->inplace_count);
 135 }
 136
 137 /*
 138  * This function calculates BDF of every segments
 139  */
 140 static void update_sit_info(struct f2fs_sb_info *sbi)
 141 {
 142         struct f2fs_stat_info *si = F2FS_STAT(sbi);
 143         unsigned long long blks_per_sec, hblks_per_sec, total_vblocks;
 144         unsigned long long bimodal, dist;
 145         unsigned int segno, vblocks;
 146         int ndirty = 0;
 147
 148         bimodal = 0;
 149         total_vblocks = 0;
 150         blks_per_sec = BLKS_PER_SEC(sbi);
 151         hblks_per_sec = blks_per_sec / 2;
 152         for (segno = 0; segno < MAIN_SEGS(sbi); segno += sbi->segs_per_sec) {
 153                 vblocks = get_valid_blocks(sbi, segno, true);
 154                 dist = abs(vblocks - hblks_per_sec);
 155                 bimodal += dist * dist;
 156
 157                 if (vblocks > 0 && vblocks < blks_per_sec) {
 158                         total_vblocks += vblocks;
 159                         ndirty++;
 160                 }
 161         }
 162         dist = div_u64(MAIN_SECS(sbi) * hblks_per_sec * hblks_per_sec, 100);
 163         si->bimodal = div64_u64(bimodal, dist);
 164         if (si->dirty_count)
 165                 si->avg_vblocks = div_u64(total_vblocks, ndirty);
 166         else
 167                 si->avg_vblocks = 0;
 168 }
 169
 170 /*
 171  * This function calculates memory footprint.
 172  */
 173 static void update_mem_info(struct f2fs_sb_info *sbi)
 174 {
 175         struct f2fs_stat_info *si = F2FS_STAT(sbi);
 176         unsigned npages;
 177         int i;
 178
 179         if (si->base_mem)
 180                 goto get_cache;
 181
 182         /* build stat */
 183         si->base_mem = sizeof(struct f2fs_stat_info);
 184
 185         /* build superblock */
 186         si->base_mem += sizeof(struct f2fs_sb_info) + sbi->sb->s_blocksize;
 187         si->base_mem += 2 * sizeof(struct f2fs_inode_info);
 188         si->base_mem += sizeof(*sbi->ckpt);
 189         si->base_mem += sizeof(struct percpu_counter) * NR_COUNT_TYPE;
 190
 191         /* build sm */
 192         si->base_mem += sizeof(struct f2fs_sm_info);
 193
 194         /* build sit */
 195         si->base_mem += sizeof(struct sit_info);
 196         si->base_mem += MAIN_SEGS(sbi) * sizeof(struct seg_entry);
 197         si->base_mem += f2fs_bitmap_size(MAIN_SEGS(sbi));
 198         si->base_mem += 2 * SIT_VBLOCK_MAP_SIZE * MAIN_SEGS(sbi);
 199         if (f2fs_discard_en(sbi))
 200                 si->base_mem += SIT_VBLOCK_MAP_SIZE * MAIN_SEGS(sbi);
 201         si->base_mem += SIT_VBLOCK_MAP_SIZE;
 202         if (sbi->segs_per_sec > 1)
 203                 si->base_mem += MAIN_SECS(sbi) * sizeof(struct sec_entry);
 204         si->base_mem += __bitmap_size(sbi, SIT_BITMAP);
 205
 206         /* build free segmap */
 207         si->base_mem += sizeof(struct free_segmap_info);
 208         si->base_mem += f2fs_bitmap_size(MAIN_SEGS(sbi));
 209         si->base_mem += f2fs_bitmap_size(MAIN_SECS(sbi));
 210
 211         /* build curseg */
 212         si->base_mem += sizeof(struct curseg_info) * NR_CURSEG_TYPE;
 213         si->base_mem += PAGE_SIZE * NR_CURSEG_TYPE;
 214
 215         /* build dirty segmap */
 216         si->base_mem += sizeof(struct dirty_seglist_info);
 217         si->base_mem += NR_DIRTY_TYPE * f2fs_bitmap_size(MAIN_SEGS(sbi));
 218         si->base_mem += f2fs_bitmap_size(MAIN_SECS(sbi));
 219
 220         /* build nm */
 221         si->base_mem += sizeof(struct f2fs_nm_info);
 222         si->base_mem += __bitmap_size(sbi, NAT_BITMAP);
 223         si->base_mem += (NM_I(sbi)->nat_bits_blocks << F2FS_BLKSIZE_BITS);
 224         si->base_mem += NM_I(sbi)->nat_blocks * NAT_ENTRY_BITMAP_SIZE;
 225         si->base_mem += NM_I(sbi)->nat_blocks / 8;
 226         si->base_mem += NM_I(sbi)->nat_blocks * sizeof(unsigned short);
 227
 228 get_cache:
 229         si->cache_mem = 0;
 230
 231         /* build gc */
 232         if (sbi->gc_thread)
 233                 si->cache_mem += sizeof(struct f2fs_gc_kthread);
 234
 235         /* build merge flush thread */
 236         if (SM_I(sbi)->fcc_info)
 237                 si->cache_mem += sizeof(struct flush_cmd_control);
 238         if (SM_I(sbi)->dcc_info) {
 239                 si->cache_mem += sizeof(struct discard_cmd_control);
 240                 si->cache_mem += sizeof(struct discard_cmd) *
 241                         atomic_read(&SM_I(sbi)->dcc_info->discard_cmd_cnt);
 242         }
 243
 244         /* free nids */
 245         si->cache_mem += (NM_I(sbi)->nid_cnt[FREE_NID] +
 246                                 NM_I(sbi)->nid_cnt[PREALLOC_NID]) *
 247                                 sizeof(struct free_nid);
 248         si->cache_mem += NM_I(sbi)->nat_cnt * sizeof(struct nat_entry);
 249         si->cache_mem += NM_I(sbi)->dirty_nat_cnt *
 250                                         sizeof(struct nat_entry_set);
 251         si->cache_mem += si->inmem_pages * sizeof(struct inmem_pages);
 252         for (i = 0; i < MAX_INO_ENTRY; i++)
 253                 si->cache_mem += sbi->im[i].ino_num * sizeof(struct ino_entry);
 254         si->cache_mem += atomic_read(&sbi->total_ext_tree) *
 255                                                 sizeof(struct extent_tree);
 256         si->cache_mem += atomic_read(&sbi->total_ext_node) *
 257                                                 sizeof(struct extent_node);
 258
 259         si->page_mem = 0;
 260         npages = NODE_MAPPING(sbi)->nrpages;
 261         si->page_mem += (unsigned long long)npages << PAGE_SHIFT;
 262         npages = META_MAPPING(sbi)->nrpages;
 263         si->page_mem += (unsigned long long)npages << PAGE_SHIFT;
 264 }
 265
 266 static int stat_show(struct seq_file *s, void *v)
 267 {
 268         struct f2fs_stat_info *si;
 269         int i = 0;
 270         int j;
 271
 272         mutex_lock(&f2fs_stat_mutex);
 273         list_for_each_entry(si, &f2fs_stat_list, stat_list) {
 274                 update_general_status(si->sbi);
 275
 276                 seq_printf(s, "\n=====[ partition info(%pg). #%d, %s, CP: %s]=====\n",
 277                         si->sbi->sb->s_bdev, i++,
 278                         f2fs_readonly(si->sbi->sb) ? "RO": "RW",
 279                         f2fs_cp_error(si->sbi) ? "Error": "Good");
 280                 seq_printf(s, "[SB: 1] [CP: 2] [SIT: %d] [NAT: %d] ",
 281                            si->sit_area_segs, si->nat_area_segs);
 282                 seq_printf(s, "[SSA: %d] [MAIN: %d",
 283                            si->ssa_area_segs, si->main_area_segs);
 284                 seq_printf(s, "(OverProv:%d Resv:%d)]\n\n",
 285                            si->overp_segs, si->rsvd_segs);
 286                 if (test_opt(si->sbi, DISCARD))
 287                         seq_printf(s, "Utilization: %u%% (%u valid blocks, %u discard blocks)\n",
 288                                 si->utilization, si->valid_count, si->discard_blks);
 289                 else
 290                         seq_printf(s, "Utilization: %u%% (%u valid blocks)\n",
 291                                 si->utilization, si->valid_count);
 292
 293                 seq_printf(s, "  - Node: %u (Inode: %u, ",
 294                            si->valid_node_count, si->valid_inode_count);
 295                 seq_printf(s, "Other: %u)\n  - Data: %u\n",
 296                            si->valid_node_count - si->valid_inode_count,
 297                            si->valid_count - si->valid_node_count);
 298                 seq_printf(s, "  - Inline_xattr Inode: %u\n",
 299                            si->inline_xattr);
 300                 seq_printf(s, "  - Inline_data Inode: %u\n",
 301                            si->inline_inode);
 302                 seq_printf(s, "  - Inline_dentry Inode: %u\n",
 303                            si->inline_dir);
 304                 seq_printf(s, "  - Orphan/Append/Update Inode: %u, %u, %u\n",
 305                            si->orphans, si->append, si->update);
 306                 seq_printf(s, "\nMain area: %d segs, %d secs %d zones\n",
 307                            si->main_area_segs, si->main_area_sections,
 308                            si->main_area_zones);
 309                 seq_printf(s, "  - COLD  data: %d, %d, %d\n",
 310                            si->curseg[CURSEG_COLD_DATA],
 311                            si->cursec[CURSEG_COLD_DATA],
 312                            si->curzone[CURSEG_COLD_DATA]);
 313                 seq_printf(s, "  - WARM  data: %d, %d, %d\n",
 314                            si->curseg[CURSEG_WARM_DATA],
 315                            si->cursec[CURSEG_WARM_DATA],
 316                            si->curzone[CURSEG_WARM_DATA]);
 317                 seq_printf(s, "  - HOT   data: %d, %d, %d\n",
 318                            si->curseg[CURSEG_HOT_DATA],
 319                            si->cursec[CURSEG_HOT_DATA],
 320                            si->curzone[CURSEG_HOT_DATA]);
 321                 seq_printf(s, "  - Dir   dnode: %d, %d, %d\n",
 322                            si->curseg[CURSEG_HOT_NODE],
 323                            si->cursec[CURSEG_HOT_NODE],
 324                            si->curzone[CURSEG_HOT_NODE]);
 325                 seq_printf(s, "  - File   dnode: %d, %d, %d\n",
 326                            si->curseg[CURSEG_WARM_NODE],
 327                            si->cursec[CURSEG_WARM_NODE],
 328                            si->curzone[CURSEG_WARM_NODE]);
 329                 seq_printf(s, "  - Indir nodes: %d, %d, %d\n",
 330                            si->curseg[CURSEG_COLD_NODE],
 331                            si->cursec[CURSEG_COLD_NODE],
 332                            si->curzone[CURSEG_COLD_NODE]);
 333                 seq_printf(s, "\n  - Valid: %d\n  - Dirty: %d\n",
 334                            si->main_area_segs - si->dirty_count -
 335                            si->prefree_count - si->free_segs,
 336                            si->dirty_count);
 337                 seq_printf(s, "  - Prefree: %d\n  - Free: %d (%d)\n\n",
 338                            si->prefree_count, si->free_segs, si->free_secs);
 339                 seq_printf(s, "CP calls: %d (BG: %d)\n",
 340                                 si->cp_count, si->bg_cp_count);
 341                 seq_printf(s, "GC calls: %d (BG: %d)\n",
 342                            si->call_count, si->bg_gc);
 343                 seq_printf(s, "  - data segments : %d (%d)\n",
 344                                 si->data_segs, si->bg_data_segs);
 345                 seq_printf(s, "  - node segments : %d (%d)\n",
 346                                 si->node_segs, si->bg_node_segs);
 347                 seq_printf(s, "Try to move %d blocks (BG: %d)\n", si->tot_blks,
 348                                 si->bg_data_blks + si->bg_node_blks);
 349                 seq_printf(s, "  - data blocks : %d (%d)\n", si->data_blks,
 350                                 si->bg_data_blks);
 351                 seq_printf(s, "  - node blocks : %d (%d)\n", si->node_blks,
 352                                 si->bg_node_blks);
 353                 seq_puts(s, "\nExtent Cache:\n");
 354                 seq_printf(s, "  - Hit Count: L1-1:%llu L1-2:%llu L2:%llu\n",
 355                                 si->hit_largest, si->hit_cached,
 356                                 si->hit_rbtree);
 357                 seq_printf(s, "  - Hit Ratio: %llu%% (%llu / %llu)\n",
 358                                 !si->total_ext ? 0 :
 359                                 div64_u64(si->hit_total * 100, si->total_ext),
 360                                 si->hit_total, si->total_ext);
 361                 seq_printf(s, "  - Inner Struct Count: tree: %d(%d), node: %d\n",
 362                                 si->ext_tree, si->zombie_tree, si->ext_node);
 363                 seq_puts(s, "\nBalancing F2FS Async:\n");
 364                 seq_printf(s, "  - IO (CP: %4d, Data: %4d, Flush: (%4d %4d %4d), "
 365                         "Discard: (%4d %4d)) cmd: %4d undiscard:%4u\n",
 366                            si->nr_wb_cp_data, si->nr_wb_data,
 367                            si->nr_flushing, si->nr_flushed,
 368                            si->flush_list_empty,
 369                            si->nr_discarding, si->nr_discarded,
 370                            si->nr_discard_cmd, si->undiscard_blks);
 371                 seq_printf(s, "  - inmem: %4d, atomic IO: %4d (Max. %4d), "
 372                         "volatile IO: %4d (Max. %4d)\n",
 373                            si->inmem_pages, si->aw_cnt, si->max_aw_cnt,
 374                            si->vw_cnt, si->max_vw_cnt);
 375                 seq_printf(s, "  - nodes: %4d in %4d\n",
 376                            si->ndirty_node, si->node_pages);
 377                 seq_printf(s, "  - dents: %4d in dirs:%4d (%4d)\n",
 378                            si->ndirty_dent, si->ndirty_dirs, si->ndirty_all);
 379                 seq_printf(s, "  - datas: %4d in files:%4d\n",
 380                            si->ndirty_data, si->ndirty_files);
 381                 seq_printf(s, "  - quota datas: %4d in quota files:%4d\n",
 382                            si->ndirty_qdata, si->nquota_files);
 383                 seq_printf(s, "  - meta: %4d in %4d\n",
 384                            si->ndirty_meta, si->meta_pages);
 385                 seq_printf(s, "  - imeta: %4d\n",
 386                            si->ndirty_imeta);
 387                 seq_printf(s, "  - NATs: %9d/%9d\n  - SITs: %9d/%9d\n",
 388                            si->dirty_nats, si->nats, si->dirty_sits, si->sits);
 389                 seq_printf(s, "  - free_nids: %9d/%9d\n  - alloc_nids: %9d\n",
 390                            si->free_nids, si->avail_nids, si->alloc_nids);
 391                 seq_puts(s, "\nDistribution of User Blocks:");
 392                 seq_puts(s, " [ valid | invalid | free ]\n");
 393                 seq_puts(s, "  [");
 394
 395                 for (j = 0; j < si->util_valid; j++)
 396                         seq_putc(s, '-');
 397                 seq_putc(s, '|');
 398
 399                 for (j = 0; j < si->util_invalid; j++)
 400                         seq_putc(s, '-');
 401                 seq_putc(s, '|');
 402
 403                 for (j = 0; j < si->util_free; j++)
 404                         seq_putc(s, '-');
 405                 seq_puts(s, "]\n\n");
 406                 seq_printf(s, "IPU: %u blocks\n", si->inplace_count);
 407                 seq_printf(s, "SSR: %u blocks in %u segments\n",
 408                            si->block_count[SSR], si->segment_count[SSR]);
 409                 seq_printf(s, "LFS: %u blocks in %u segments\n",
 410                            si->block_count[LFS], si->segment_count[LFS]);
 411
 412                 /* segment usage info */
 413                 update_sit_info(si->sbi);
 414                 seq_printf(s, "\nBDF: %u, avg. vblocks: %u\n",
 415                            si->bimodal, si->avg_vblocks);
 416
 417                 /* memory footprint */
 418                 update_mem_info(si->sbi);
 419                 seq_printf(s, "\nMemory: %llu KB\n",
 420                         (si->base_mem + si->cache_mem + si->page_mem) >> 10);
 421                 seq_printf(s, "  - static: %llu KB\n",
 422                                 si->base_mem >> 10);
 423                 seq_printf(s, "  - cached: %llu KB\n",
 424                                 si->cache_mem >> 10);
 425                 seq_printf(s, "  - paged : %llu KB\n",
 426                                 si->page_mem >> 10);
 427         }
 428         mutex_unlock(&f2fs_stat_mutex);
 429         return 0;
 430 }
 431
 432 static int stat_open(struct inode *inode, struct file *file)
 433 {
 434         return single_open(file, stat_show, inode->i_private);
 435 }
 436
 437 static const struct file_operations stat_fops = {
 438         .owner = THIS_MODULE,
 439         .open = stat_open,
 440         .read = seq_read,
 441         .llseek = seq_lseek,
 442         .release = single_release,
 443 };
 444
 445 int f2fs_build_stats(struct f2fs_sb_info *sbi)
 446 {
 447         struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
 448         struct f2fs_stat_info *si;
 449
 450         si = kzalloc(sizeof(struct f2fs_stat_info), GFP_KERNEL);
 451         if (!si)
 452                 return -ENOMEM;
 453
 454         si->all_area_segs = le32_to_cpu(raw_super->segment_count);
 455         si->sit_area_segs = le32_to_cpu(raw_super->segment_count_sit);
 456         si->nat_area_segs = le32_to_cpu(raw_super->segment_count_nat);
 457         si->ssa_area_segs = le32_to_cpu(raw_super->segment_count_ssa);
 458         si->main_area_segs = le32_to_cpu(raw_super->segment_count_main);
 459         si->main_area_sections = le32_to_cpu(raw_super->section_count);
 460         si->main_area_zones = si->main_area_sections /
 461                                 le32_to_cpu(raw_super->secs_per_zone);
 462         si->sbi = sbi;
 463         sbi->stat_info = si;
 464
 465         atomic64_set(&sbi->total_hit_ext, 0);
 466         atomic64_set(&sbi->read_hit_rbtree, 0);
 467         atomic64_set(&sbi->read_hit_largest, 0);
 468         atomic64_set(&sbi->read_hit_cached, 0);
 469
 470         atomic_set(&sbi->inline_xattr, 0);
 471         atomic_set(&sbi->inline_inode, 0);
 472         atomic_set(&sbi->inline_dir, 0);
 473         atomic_set(&sbi->inplace_count, 0);
 474
 475         atomic_set(&sbi->aw_cnt, 0);
 476         atomic_set(&sbi->vw_cnt, 0);
 477         atomic_set(&sbi->max_aw_cnt, 0);
 478         atomic_set(&sbi->max_vw_cnt, 0);
 479
 480         mutex_lock(&f2fs_stat_mutex);
 481         list_add_tail(&si->stat_list, &f2fs_stat_list);
 482         mutex_unlock(&f2fs_stat_mutex);
 483
 484         return 0;
 485 }
 486
 487 void f2fs_destroy_stats(struct f2fs_sb_info *sbi)
 488 {
 489         struct f2fs_stat_info *si = F2FS_STAT(sbi);
 490
 491         mutex_lock(&f2fs_stat_mutex);
 492         list_del(&si->stat_list);
 493         mutex_unlock(&f2fs_stat_mutex);
 494
 495         kfree(si);
 496 }
 497
 498 int __init f2fs_create_root_stats(void)
 499 {
 500         struct dentry *file;
 501
 502         f2fs_debugfs_root = debugfs_create_dir("f2fs", NULL);
 503         if (!f2fs_debugfs_root)
 504                 return -ENOMEM;
 505
 506         file = debugfs_create_file("status", S_IRUGO, f2fs_debugfs_root,
 507                         NULL, &stat_fops);
 508         if (!file) {
 509                 debugfs_remove(f2fs_debugfs_root);
 510                 f2fs_debugfs_root = NULL;
 511                 return -ENOMEM;
 512         }
 513
 514         return 0;
 515 }
 516
 517 void f2fs_destroy_root_stats(void)
 518 {
 519         if (!f2fs_debugfs_root)
 520                 return;
 521
 522         debugfs_remove_recursive(f2fs_debugfs_root);
 523         f2fs_debugfs_root = NULL;
 524 }