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         si->nquota_files = sbi->nquota_files;
  53         si->ndirty_all = sbi->ndirty_inode[DIRTY_META];
  54         si->inmem_pages = get_pages(sbi, F2FS_INMEM_PAGES);
  55         si->aw_cnt = atomic_read(&sbi->aw_cnt);
  56         si->vw_cnt = atomic_read(&sbi->vw_cnt);
  57         si->max_aw_cnt = atomic_read(&sbi->max_aw_cnt);
  58         si->max_vw_cnt = atomic_read(&sbi->max_vw_cnt);
  59         si->nr_wb_cp_data = get_pages(sbi, F2FS_WB_CP_DATA);
  60         si->nr_wb_data = get_pages(sbi, F2FS_WB_DATA);
  61         if (SM_I(sbi) && SM_I(sbi)->fcc_info) {
  62                 si->nr_flushed =
  63                         atomic_read(&SM_I(sbi)->fcc_info->issued_flush);
  64                 si->nr_flushing =
  65                         atomic_read(&SM_I(sbi)->fcc_info->issing_flush);
  66                 si->flush_list_empty =
  67                         llist_empty(&SM_I(sbi)->fcc_info->issue_list);
  68         }
  69         if (SM_I(sbi) && SM_I(sbi)->dcc_info) {
  70                 si->nr_discarded =
  71                         atomic_read(&SM_I(sbi)->dcc_info->issued_discard);
  72                 si->nr_discarding =
  73                         atomic_read(&SM_I(sbi)->dcc_info->issing_discard);
  74                 si->nr_discard_cmd =
  75                         atomic_read(&SM_I(sbi)->dcc_info->discard_cmd_cnt);
  76                 si->undiscard_blks = SM_I(sbi)->dcc_info->undiscard_blks;
  77         }
  78         si->total_count = (int)sbi->user_block_count / sbi->blocks_per_seg;
  79         si->rsvd_segs = reserved_segments(sbi);
  80         si->overp_segs = overprovision_segments(sbi);
  81         si->valid_count = valid_user_blocks(sbi);
  82         si->discard_blks = discard_blocks(sbi);
  83         si->valid_node_count = valid_node_count(sbi);
  84         si->valid_inode_count = valid_inode_count(sbi);
  85         si->inline_xattr = atomic_read(&sbi->inline_xattr);
  86         si->inline_inode = atomic_read(&sbi->inline_inode);
  87         si->inline_dir = atomic_read(&sbi->inline_dir);
  88         si->append = sbi->im[APPEND_INO].ino_num;
  89         si->update = sbi->im[UPDATE_INO].ino_num;
  90         si->orphans = sbi->im[ORPHAN_INO].ino_num;
  91         si->utilization = utilization(sbi);
  92
  93         si->free_segs = free_segments(sbi);
  94         si->free_secs = free_sections(sbi);
  95         si->prefree_count = prefree_segments(sbi);
  96         si->dirty_count = dirty_segments(sbi);
  97         if (sbi->node_inode)
  98                 si->node_pages = NODE_MAPPING(sbi)->nrpages;
  99         if (sbi->meta_inode)
 100                 si->meta_pages = META_MAPPING(sbi)->nrpages;
 101         si->nats = NM_I(sbi)->nat_cnt;
 102         si->dirty_nats = NM_I(sbi)->dirty_nat_cnt;
 103         si->sits = MAIN_SEGS(sbi);
 104         si->dirty_sits = SIT_I(sbi)->dirty_sentries;
 105         si->free_nids = NM_I(sbi)->nid_cnt[FREE_NID];
 106         si->avail_nids = NM_I(sbi)->available_nids;
 107         si->alloc_nids = NM_I(sbi)->nid_cnt[PREALLOC_NID];
 108         si->bg_gc = sbi->bg_gc;
 109         si->skipped_atomic_files[BG_GC] = sbi->skipped_atomic_files[BG_GC];
 110         si->skipped_atomic_files[FG_GC] = sbi->skipped_atomic_files[FG_GC];
 111         si->util_free = (int)(free_user_blocks(sbi) >> sbi->log_blocks_per_seg)
 112                 * 100 / (int)(sbi->user_block_count >> sbi->log_blocks_per_seg)
 113                 / 2;
 114         si->util_valid = (int)(written_block_count(sbi) >>
 115                                                 sbi->log_blocks_per_seg)
 116                 * 100 / (int)(sbi->user_block_count >> sbi->log_blocks_per_seg)
 117                 / 2;
 118         si->util_invalid = 50 - si->util_free - si->util_valid;
 119         for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_NODE; i++) {
 120                 struct curseg_info *curseg = CURSEG_I(sbi, i);
 121                 si->curseg[i] = curseg->segno;
 122                 si->cursec[i] = GET_SEC_FROM_SEG(sbi, curseg->segno);
 123                 si->curzone[i] = GET_ZONE_FROM_SEC(sbi, si->cursec[i]);
 124         }
 125
 126         for (i = 0; i < 2; i++) {
 127                 si->segment_count[i] = sbi->segment_count[i];
 128                 si->block_count[i] = sbi->block_count[i];
 129         }
 130
 131         si->inplace_count = atomic_read(&sbi->inplace_count);
 132 }
 133
 134 /*
 135  * This function calculates BDF of every segments
 136  */
 137 static void update_sit_info(struct f2fs_sb_info *sbi)
 138 {
 139         struct f2fs_stat_info *si = F2FS_STAT(sbi);
 140         unsigned long long blks_per_sec, hblks_per_sec, total_vblocks;
 141         unsigned long long bimodal, dist;
 142         unsigned int segno, vblocks;
 143         int ndirty = 0;
 144
 145         bimodal = 0;
 146         total_vblocks = 0;
 147         blks_per_sec = BLKS_PER_SEC(sbi);
 148         hblks_per_sec = blks_per_sec / 2;
 149         for (segno = 0; segno < MAIN_SEGS(sbi); segno += sbi->segs_per_sec) {
 150                 vblocks = get_valid_blocks(sbi, segno, true);
 151                 dist = abs(vblocks - hblks_per_sec);
 152                 bimodal += dist * dist;
 153
 154                 if (vblocks > 0 && vblocks < blks_per_sec) {
 155                         total_vblocks += vblocks;
 156                         ndirty++;
 157                 }
 158         }
 159         dist = div_u64(MAIN_SECS(sbi) * hblks_per_sec * hblks_per_sec, 100);
 160         si->bimodal = div64_u64(bimodal, dist);
 161         if (si->dirty_count)
 162                 si->avg_vblocks = div_u64(total_vblocks, ndirty);
 163         else
 164                 si->avg_vblocks = 0;
 165 }
 166
 167 /*
 168  * This function calculates memory footprint.
 169  */
 170 static void update_mem_info(struct f2fs_sb_info *sbi)
 171 {
 172         struct f2fs_stat_info *si = F2FS_STAT(sbi);
 173         int i;
 174
 175         if (si->base_mem)
 176                 goto get_cache;
 177
 178         /* build stat */
 179         si->base_mem = sizeof(struct f2fs_stat_info);
 180
 181         /* build superblock */
 182         si->base_mem += sizeof(struct f2fs_sb_info) + sbi->sb->s_blocksize;
 183         si->base_mem += 2 * sizeof(struct f2fs_inode_info);
 184         si->base_mem += sizeof(*sbi->ckpt);
 185
 186         /* build sm */
 187         si->base_mem += sizeof(struct f2fs_sm_info);
 188
 189         /* build sit */
 190         si->base_mem += sizeof(struct sit_info);
 191         si->base_mem += MAIN_SEGS(sbi) * sizeof(struct seg_entry);
 192         si->base_mem += f2fs_bitmap_size(MAIN_SEGS(sbi));
 193         si->base_mem += 2 * SIT_VBLOCK_MAP_SIZE * MAIN_SEGS(sbi);
 194         si->base_mem += SIT_VBLOCK_MAP_SIZE * MAIN_SEGS(sbi);
 195         si->base_mem += SIT_VBLOCK_MAP_SIZE;
 196         if (sbi->segs_per_sec > 1)
 197                 si->base_mem += MAIN_SECS(sbi) * sizeof(struct sec_entry);
 198         si->base_mem += __bitmap_size(sbi, SIT_BITMAP);
 199
 200         /* build free segmap */
 201         si->base_mem += sizeof(struct free_segmap_info);
 202         si->base_mem += f2fs_bitmap_size(MAIN_SEGS(sbi));
 203         si->base_mem += f2fs_bitmap_size(MAIN_SECS(sbi));
 204
 205         /* build curseg */
 206         si->base_mem += sizeof(struct curseg_info) * NR_CURSEG_TYPE;
 207         si->base_mem += PAGE_SIZE * NR_CURSEG_TYPE;
 208
 209         /* build dirty segmap */
 210         si->base_mem += sizeof(struct dirty_seglist_info);
 211         si->base_mem += NR_DIRTY_TYPE * f2fs_bitmap_size(MAIN_SEGS(sbi));
 212         si->base_mem += f2fs_bitmap_size(MAIN_SECS(sbi));
 213
 214         /* build nm */
 215         si->base_mem += sizeof(struct f2fs_nm_info);
 216         si->base_mem += __bitmap_size(sbi, NAT_BITMAP);
 217         si->base_mem += (NM_I(sbi)->nat_bits_blocks << F2FS_BLKSIZE_BITS);
 218         si->base_mem += NM_I(sbi)->nat_blocks *
 219                                 f2fs_bitmap_size(NAT_ENTRY_PER_BLOCK);
 220         si->base_mem += NM_I(sbi)->nat_blocks / 8;
 221         si->base_mem += NM_I(sbi)->nat_blocks * sizeof(unsigned short);
 222
 223 get_cache:
 224         si->cache_mem = 0;
 225
 226         /* build gc */
 227         if (sbi->gc_thread)
 228                 si->cache_mem += sizeof(struct f2fs_gc_kthread);
 229
 230         /* build merge flush thread */
 231         if (SM_I(sbi)->fcc_info)
 232                 si->cache_mem += sizeof(struct flush_cmd_control);
 233         if (SM_I(sbi)->dcc_info) {
 234                 si->cache_mem += sizeof(struct discard_cmd_control);
 235                 si->cache_mem += sizeof(struct discard_cmd) *
 236                         atomic_read(&SM_I(sbi)->dcc_info->discard_cmd_cnt);
 237         }
 238
 239         /* free nids */
 240         si->cache_mem += (NM_I(sbi)->nid_cnt[FREE_NID] +
 241                                 NM_I(sbi)->nid_cnt[PREALLOC_NID]) *
 242                                 sizeof(struct free_nid);
 243         si->cache_mem += NM_I(sbi)->nat_cnt * sizeof(struct nat_entry);
 244         si->cache_mem += NM_I(sbi)->dirty_nat_cnt *
 245                                         sizeof(struct nat_entry_set);
 246         si->cache_mem += si->inmem_pages * sizeof(struct inmem_pages);
 247         for (i = 0; i < MAX_INO_ENTRY; i++)
 248                 si->cache_mem += sbi->im[i].ino_num * sizeof(struct ino_entry);
 249         si->cache_mem += atomic_read(&sbi->total_ext_tree) *
 250                                                 sizeof(struct extent_tree);
 251         si->cache_mem += atomic_read(&sbi->total_ext_node) *
 252                                                 sizeof(struct extent_node);
 253
 254         si->page_mem = 0;
 255         if (sbi->node_inode) {
 256                 unsigned npages = NODE_MAPPING(sbi)->nrpages;
 257                 si->page_mem += (unsigned long long)npages << PAGE_SHIFT;
 258         }
 259         if (sbi->meta_inode) {
 260                 unsigned npages = META_MAPPING(sbi)->nrpages;
 261                 si->page_mem += (unsigned long long)npages << PAGE_SHIFT;
 262         }
 263 }
 264
 265 static int stat_show(struct seq_file *s, void *v)
 266 {
 267         struct f2fs_stat_info *si;
 268         int i = 0;
 269         int j;
 270
 271         mutex_lock(&f2fs_stat_mutex);
 272         list_for_each_entry(si, &f2fs_stat_list, stat_list) {
 273                 update_general_status(si->sbi);
 274
 275                 seq_printf(s, "\n=====[ partition info(%pg). #%d, %s, CP: %s]=====\n",
 276                         si->sbi->sb->s_bdev, i++,
 277                         f2fs_readonly(si->sbi->sb) ? "RO": "RW",
 278                         f2fs_cp_error(si->sbi) ? "Error": "Good");
 279                 seq_printf(s, "[SB: 1] [CP: 2] [SIT: %d] [NAT: %d] ",
 280                            si->sit_area_segs, si->nat_area_segs);
 281                 seq_printf(s, "[SSA: %d] [MAIN: %d",
 282                            si->ssa_area_segs, si->main_area_segs);
 283                 seq_printf(s, "(OverProv:%d Resv:%d)]\n\n",
 284                            si->overp_segs, si->rsvd_segs);
 285                 if (test_opt(si->sbi, DISCARD))
 286                         seq_printf(s, "Utilization: %u%% (%u valid blocks, %u discard blocks)\n",
 287                                 si->utilization, si->valid_count, si->discard_blks);
 288                 else
 289                         seq_printf(s, "Utilization: %u%% (%u valid blocks)\n",
 290                                 si->utilization, si->valid_count);
 291
 292                 seq_printf(s, "  - Node: %u (Inode: %u, ",
 293                            si->valid_node_count, si->valid_inode_count);
 294                 seq_printf(s, "Other: %u)\n  - Data: %u\n",
 295                            si->valid_node_count - si->valid_inode_count,
 296                            si->valid_count - si->valid_node_count);
 297                 seq_printf(s, "  - Inline_xattr Inode: %u\n",
 298                            si->inline_xattr);
 299                 seq_printf(s, "  - Inline_data Inode: %u\n",
 300                            si->inline_inode);
 301                 seq_printf(s, "  - Inline_dentry Inode: %u\n",
 302                            si->inline_dir);
 303                 seq_printf(s, "  - Orphan/Append/Update Inode: %u, %u, %u\n",
 304                            si->orphans, si->append, si->update);
 305                 seq_printf(s, "\nMain area: %d segs, %d secs %d zones\n",
 306                            si->main_area_segs, si->main_area_sections,
 307                            si->main_area_zones);
 308                 seq_printf(s, "  - COLD  data: %d, %d, %d\n",
 309                            si->curseg[CURSEG_COLD_DATA],
 310                            si->cursec[CURSEG_COLD_DATA],
 311                            si->curzone[CURSEG_COLD_DATA]);
 312                 seq_printf(s, "  - WARM  data: %d, %d, %d\n",
 313                            si->curseg[CURSEG_WARM_DATA],
 314                            si->cursec[CURSEG_WARM_DATA],
 315                            si->curzone[CURSEG_WARM_DATA]);
 316                 seq_printf(s, "  - HOT   data: %d, %d, %d\n",
 317                            si->curseg[CURSEG_HOT_DATA],
 318                            si->cursec[CURSEG_HOT_DATA],
 319                            si->curzone[CURSEG_HOT_DATA]);
 320                 seq_printf(s, "  - Dir   dnode: %d, %d, %d\n",
 321                            si->curseg[CURSEG_HOT_NODE],
 322                            si->cursec[CURSEG_HOT_NODE],
 323                            si->curzone[CURSEG_HOT_NODE]);
 324                 seq_printf(s, "  - File   dnode: %d, %d, %d\n",
 325                            si->curseg[CURSEG_WARM_NODE],
 326                            si->cursec[CURSEG_WARM_NODE],
 327                            si->curzone[CURSEG_WARM_NODE]);
 328                 seq_printf(s, "  - Indir nodes: %d, %d, %d\n",
 329                            si->curseg[CURSEG_COLD_NODE],
 330                            si->cursec[CURSEG_COLD_NODE],
 331                            si->curzone[CURSEG_COLD_NODE]);
 332                 seq_printf(s, "\n  - Valid: %d\n  - Dirty: %d\n",
 333                            si->main_area_segs - si->dirty_count -
 334                            si->prefree_count - si->free_segs,
 335                            si->dirty_count);
 336                 seq_printf(s, "  - Prefree: %d\n  - Free: %d (%d)\n\n",
 337                            si->prefree_count, si->free_segs, si->free_secs);
 338                 seq_printf(s, "CP calls: %d (BG: %d)\n",
 339                                 si->cp_count, si->bg_cp_count);
 340                 seq_printf(s, "GC calls: %d (BG: %d)\n",
 341                            si->call_count, si->bg_gc);
 342                 seq_printf(s, "  - data segments : %d (%d)\n",
 343                                 si->data_segs, si->bg_data_segs);
 344                 seq_printf(s, "  - node segments : %d (%d)\n",
 345                                 si->node_segs, si->bg_node_segs);
 346                 seq_printf(s, "Try to move %d blocks (BG: %d)\n", si->tot_blks,
 347                                 si->bg_data_blks + si->bg_node_blks);
 348                 seq_printf(s, "  - data blocks : %d (%d)\n", si->data_blks,
 349                                 si->bg_data_blks);
 350                 seq_printf(s, "  - node blocks : %d (%d)\n", si->node_blks,
 351                                 si->bg_node_blks);
 352                 seq_printf(s, "Skipped : atomic write %llu (%llu)\n",
 353                                 si->skipped_atomic_files[BG_GC] +
 354                                 si->skipped_atomic_files[FG_GC],
 355                                 si->skipped_atomic_files[BG_GC]);
 356                 seq_puts(s, "\nExtent Cache:\n");
 357                 seq_printf(s, "  - Hit Count: L1-1:%llu L1-2:%llu L2:%llu\n",
 358                                 si->hit_largest, si->hit_cached,
 359                                 si->hit_rbtree);
 360                 seq_printf(s, "  - Hit Ratio: %llu%% (%llu / %llu)\n",
 361                                 !si->total_ext ? 0 :
 362                                 div64_u64(si->hit_total * 100, si->total_ext),
 363                                 si->hit_total, si->total_ext);
 364                 seq_printf(s, "  - Inner Struct Count: tree: %d(%d), node: %d\n",
 365                                 si->ext_tree, si->zombie_tree, si->ext_node);
 366                 seq_puts(s, "\nBalancing F2FS Async:\n");
 367                 seq_printf(s, "  - IO (CP: %4d, Data: %4d, Flush: (%4d %4d %4d), "
 368                         "Discard: (%4d %4d)) cmd: %4d undiscard:%4u\n",
 369                            si->nr_wb_cp_data, si->nr_wb_data,
 370                            si->nr_flushing, si->nr_flushed,
 371                            si->flush_list_empty,
 372                            si->nr_discarding, si->nr_discarded,
 373                            si->nr_discard_cmd, si->undiscard_blks);
 374                 seq_printf(s, "  - inmem: %4d, atomic IO: %4d (Max. %4d), "
 375                         "volatile IO: %4d (Max. %4d)\n",
 376                            si->inmem_pages, si->aw_cnt, si->max_aw_cnt,
 377                            si->vw_cnt, si->max_vw_cnt);
 378                 seq_printf(s, "  - nodes: %4d in %4d\n",
 379                            si->ndirty_node, si->node_pages);
 380                 seq_printf(s, "  - dents: %4d in dirs:%4d (%4d)\n",
 381                            si->ndirty_dent, si->ndirty_dirs, si->ndirty_all);
 382                 seq_printf(s, "  - datas: %4d in files:%4d\n",
 383                            si->ndirty_data, si->ndirty_files);
 384                 seq_printf(s, "  - quota datas: %4d in quota files:%4d\n",
 385                            si->ndirty_qdata, si->nquota_files);
 386                 seq_printf(s, "  - meta: %4d in %4d\n",
 387                            si->ndirty_meta, si->meta_pages);
 388                 seq_printf(s, "  - imeta: %4d\n",
 389                            si->ndirty_imeta);
 390                 seq_printf(s, "  - NATs: %9d/%9d\n  - SITs: %9d/%9d\n",
 391                            si->dirty_nats, si->nats, si->dirty_sits, si->sits);
 392                 seq_printf(s, "  - free_nids: %9d/%9d\n  - alloc_nids: %9d\n",
 393                            si->free_nids, si->avail_nids, si->alloc_nids);
 394                 seq_puts(s, "\nDistribution of User Blocks:");
 395                 seq_puts(s, " [ valid | invalid | free ]\n");
 396                 seq_puts(s, "  [");
 397
 398                 for (j = 0; j < si->util_valid; j++)
 399                         seq_putc(s, '-');
 400                 seq_putc(s, '|');
 401
 402                 for (j = 0; j < si->util_invalid; j++)
 403                         seq_putc(s, '-');
 404                 seq_putc(s, '|');
 405
 406                 for (j = 0; j < si->util_free; j++)
 407                         seq_putc(s, '-');
 408                 seq_puts(s, "]\n\n");
 409                 seq_printf(s, "IPU: %u blocks\n", si->inplace_count);
 410                 seq_printf(s, "SSR: %u blocks in %u segments\n",
 411                            si->block_count[SSR], si->segment_count[SSR]);
 412                 seq_printf(s, "LFS: %u blocks in %u segments\n",
 413                            si->block_count[LFS], si->segment_count[LFS]);
 414
 415                 /* segment usage info */
 416                 update_sit_info(si->sbi);
 417                 seq_printf(s, "\nBDF: %u, avg. vblocks: %u\n",
 418                            si->bimodal, si->avg_vblocks);
 419
 420                 /* memory footprint */
 421                 update_mem_info(si->sbi);
 422                 seq_printf(s, "\nMemory: %llu KB\n",
 423                         (si->base_mem + si->cache_mem + si->page_mem) >> 10);
 424                 seq_printf(s, "  - static: %llu KB\n",
 425                                 si->base_mem >> 10);
 426                 seq_printf(s, "  - cached: %llu KB\n",
 427                                 si->cache_mem >> 10);
 428                 seq_printf(s, "  - paged : %llu KB\n",
 429                                 si->page_mem >> 10);
 430         }
 431         mutex_unlock(&f2fs_stat_mutex);
 432         return 0;
 433 }
 434
 435 static int stat_open(struct inode *inode, struct file *file)
 436 {
 437         return single_open(file, stat_show, inode->i_private);
 438 }
 439
 440 static const struct file_operations stat_fops = {
 441         .owner = THIS_MODULE,
 442         .open = stat_open,
 443         .read = seq_read,
 444         .llseek = seq_lseek,
 445         .release = single_release,
 446 };
 447
 448 int f2fs_build_stats(struct f2fs_sb_info *sbi)
 449 {
 450         struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
 451         struct f2fs_stat_info *si;
 452
 453         si = f2fs_kzalloc(sbi, sizeof(struct f2fs_stat_info), GFP_KERNEL);
 454         if (!si)
 455                 return -ENOMEM;
 456
 457         si->all_area_segs = le32_to_cpu(raw_super->segment_count);
 458         si->sit_area_segs = le32_to_cpu(raw_super->segment_count_sit);
 459         si->nat_area_segs = le32_to_cpu(raw_super->segment_count_nat);
 460         si->ssa_area_segs = le32_to_cpu(raw_super->segment_count_ssa);
 461         si->main_area_segs = le32_to_cpu(raw_super->segment_count_main);
 462         si->main_area_sections = le32_to_cpu(raw_super->section_count);
 463         si->main_area_zones = si->main_area_sections /
 464                                 le32_to_cpu(raw_super->secs_per_zone);
 465         si->sbi = sbi;
 466         sbi->stat_info = si;
 467
 468         atomic64_set(&sbi->total_hit_ext, 0);
 469         atomic64_set(&sbi->read_hit_rbtree, 0);
 470         atomic64_set(&sbi->read_hit_largest, 0);
 471         atomic64_set(&sbi->read_hit_cached, 0);
 472
 473         atomic_set(&sbi->inline_xattr, 0);
 474         atomic_set(&sbi->inline_inode, 0);
 475         atomic_set(&sbi->inline_dir, 0);
 476         atomic_set(&sbi->inplace_count, 0);
 477
 478         atomic_set(&sbi->aw_cnt, 0);
 479         atomic_set(&sbi->vw_cnt, 0);
 480         atomic_set(&sbi->max_aw_cnt, 0);
 481         atomic_set(&sbi->max_vw_cnt, 0);
 482
 483         mutex_lock(&f2fs_stat_mutex);
 484         list_add_tail(&si->stat_list, &f2fs_stat_list);
 485         mutex_unlock(&f2fs_stat_mutex);
 486
 487         return 0;
 488 }
 489
 490 void f2fs_destroy_stats(struct f2fs_sb_info *sbi)
 491 {
 492         struct f2fs_stat_info *si = F2FS_STAT(sbi);
 493
 494         mutex_lock(&f2fs_stat_mutex);
 495         list_del(&si->stat_list);
 496         mutex_unlock(&f2fs_stat_mutex);
 497
 498         kfree(si);
 499 }
 500
 501 int __init f2fs_create_root_stats(void)
 502 {
 503         struct dentry *file;
 504
 505         f2fs_debugfs_root = debugfs_create_dir("f2fs", NULL);
 506         if (!f2fs_debugfs_root)
 507                 return -ENOMEM;
 508
 509         file = debugfs_create_file("status", S_IRUGO, f2fs_debugfs_root,
 510                         NULL, &stat_fops);
 511         if (!file) {
 512                 debugfs_remove(f2fs_debugfs_root);
 513                 f2fs_debugfs_root = NULL;
 514                 return -ENOMEM;
 515         }
 516
 517         return 0;
 518 }
 519
 520 void f2fs_destroy_root_stats(void)
 521 {
 522         if (!f2fs_debugfs_root)
 523                 return;
 524
 525         debugfs_remove_recursive(f2fs_debugfs_root);
 526         f2fs_debugfs_root = NULL;
 527 }