| /* |
| * 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> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #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 struct dentry *f2fs_debugfs_root; |
| static DEFINE_MUTEX(f2fs_stat_mutex); |
| |
| static void update_general_status(struct f2fs_sb_info *sbi) |
| { |
| struct f2fs_stat_info *si = F2FS_STAT(sbi); |
| int i; |
| |
| /* validation check of the segment numbers */ |
| si->hit_largest = atomic64_read(&sbi->read_hit_largest); |
| si->hit_cached = atomic64_read(&sbi->read_hit_cached); |
| si->hit_rbtree = atomic64_read(&sbi->read_hit_rbtree); |
| si->hit_total = si->hit_largest + si->hit_cached + si->hit_rbtree; |
| si->total_ext = atomic64_read(&sbi->total_hit_ext); |
| si->ext_tree = atomic_read(&sbi->total_ext_tree); |
| si->zombie_tree = atomic_read(&sbi->total_zombie_tree); |
| si->ext_node = atomic_read(&sbi->total_ext_node); |
| 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_imeta = get_pages(sbi, F2FS_DIRTY_IMETA); |
| si->ndirty_dirs = sbi->ndirty_inode[DIR_INODE]; |
| si->ndirty_files = sbi->ndirty_inode[FILE_INODE]; |
| si->ndirty_all = sbi->ndirty_inode[DIRTY_META]; |
| si->inmem_pages = get_pages(sbi, F2FS_INMEM_PAGES); |
| si->aw_cnt = atomic_read(&sbi->aw_cnt); |
| si->vw_cnt = atomic_read(&sbi->vw_cnt); |
| si->max_aw_cnt = atomic_read(&sbi->max_aw_cnt); |
| si->max_vw_cnt = atomic_read(&sbi->max_vw_cnt); |
| si->nr_wb_cp_data = get_pages(sbi, F2FS_WB_CP_DATA); |
| si->nr_wb_data = get_pages(sbi, F2FS_WB_DATA); |
| if (SM_I(sbi) && 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->issing_flush); |
| } |
| if (SM_I(sbi) && 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->issing_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->total_count = (int)sbi->user_block_count / sbi->blocks_per_seg; |
| 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->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); |
| si->node_pages = NODE_MAPPING(sbi)->nrpages; |
| si->meta_pages = META_MAPPING(sbi)->nrpages; |
| si->nats = NM_I(sbi)->nat_cnt; |
| si->dirty_nats = NM_I(sbi)->dirty_nat_cnt; |
| si->sits = MAIN_SEGS(sbi); |
| si->dirty_sits = SIT_I(sbi)->dirty_sentries; |
| si->free_nids = NM_I(sbi)->nid_cnt[FREE_NID_LIST]; |
| si->alloc_nids = NM_I(sbi)->nid_cnt[ALLOC_NID_LIST]; |
| si->bg_gc = sbi->bg_gc; |
| si->util_free = (int)(free_user_blocks(sbi) >> sbi->log_blocks_per_seg) |
| * 100 / (int)(sbi->user_block_count >> sbi->log_blocks_per_seg) |
| / 2; |
| si->util_valid = (int)(written_block_count(sbi) >> |
| sbi->log_blocks_per_seg) |
| * 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 <= CURSEG_COLD_NODE; 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 = 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 BDF of every segments |
| */ |
| static void 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 = BLKS_PER_SEC(sbi); |
| hblks_per_sec = blks_per_sec / 2; |
| for (segno = 0; segno < MAIN_SEGS(sbi); segno += sbi->segs_per_sec) { |
| 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; |
| } |
| |
| /* |
| * This function calculates memory footprint. |
| */ |
| static void update_mem_info(struct f2fs_sb_info *sbi) |
| { |
| struct f2fs_stat_info *si = F2FS_STAT(sbi); |
| unsigned npages; |
| 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); |
| si->base_mem += sizeof(struct percpu_counter) * NR_COUNT_TYPE; |
| |
| /* 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); |
| if (f2fs_discard_en(sbi)) |
| si->base_mem += SIT_VBLOCK_MAP_SIZE * MAIN_SEGS(sbi); |
| si->base_mem += SIT_VBLOCK_MAP_SIZE; |
| if (sbi->segs_per_sec > 1) |
| 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 += (NM_I(sbi)->nat_bits_blocks << F2FS_BLKSIZE_BITS); |
| si->base_mem += NM_I(sbi)->nat_blocks * NAT_ENTRY_BITMAP_SIZE; |
| 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_LIST] + |
| NM_I(sbi)->nid_cnt[ALLOC_NID_LIST]) * |
| sizeof(struct free_nid); |
| si->cache_mem += NM_I(sbi)->nat_cnt * sizeof(struct nat_entry); |
| si->cache_mem += NM_I(sbi)->dirty_nat_cnt * |
| sizeof(struct nat_entry_set); |
| si->cache_mem += si->inmem_pages * sizeof(struct inmem_pages); |
| for (i = 0; i <= ORPHAN_INO; i++) |
| si->cache_mem += sbi->im[i].ino_num * sizeof(struct ino_entry); |
| si->cache_mem += atomic_read(&sbi->total_ext_tree) * |
| sizeof(struct extent_tree); |
| si->cache_mem += atomic_read(&sbi->total_ext_node) * |
| sizeof(struct extent_node); |
| |
| si->page_mem = 0; |
| npages = NODE_MAPPING(sbi)->nrpages; |
| si->page_mem += (unsigned long long)npages << PAGE_SHIFT; |
| npages = META_MAPPING(sbi)->nrpages; |
| si->page_mem += (unsigned long long)npages << PAGE_SHIFT; |
| } |
| |
| static int stat_show(struct seq_file *s, void *v) |
| { |
| struct f2fs_stat_info *si; |
| int i = 0; |
| int j; |
| |
| mutex_lock(&f2fs_stat_mutex); |
| list_for_each_entry(si, &f2fs_stat_list, stat_list) { |
| update_general_status(si->sbi); |
| |
| seq_printf(s, "\n=====[ partition info(%pg). #%d, %s]=====\n", |
| si->sbi->sb->s_bdev, i++, |
| f2fs_readonly(si->sbi->sb) ? "RO": "RW"); |
| 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); |
| if (test_opt(si->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, " - 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, " - COLD data: %d, %d, %d\n", |
| si->curseg[CURSEG_COLD_DATA], |
| si->cursec[CURSEG_COLD_DATA], |
| si->curzone[CURSEG_COLD_DATA]); |
| seq_printf(s, " - WARM data: %d, %d, %d\n", |
| si->curseg[CURSEG_WARM_DATA], |
| si->cursec[CURSEG_WARM_DATA], |
| si->curzone[CURSEG_WARM_DATA]); |
| seq_printf(s, " - HOT data: %d, %d, %d\n", |
| si->curseg[CURSEG_HOT_DATA], |
| si->cursec[CURSEG_HOT_DATA], |
| si->curzone[CURSEG_HOT_DATA]); |
| seq_printf(s, " - Dir dnode: %d, %d, %d\n", |
| si->curseg[CURSEG_HOT_NODE], |
| si->cursec[CURSEG_HOT_NODE], |
| si->curzone[CURSEG_HOT_NODE]); |
| seq_printf(s, " - File dnode: %d, %d, %d\n", |
| si->curseg[CURSEG_WARM_NODE], |
| si->cursec[CURSEG_WARM_NODE], |
| si->curzone[CURSEG_WARM_NODE]); |
| seq_printf(s, " - Indir nodes: %d, %d, %d\n", |
| si->curseg[CURSEG_COLD_NODE], |
| si->cursec[CURSEG_COLD_NODE], |
| si->curzone[CURSEG_COLD_NODE]); |
| 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); |
| seq_printf(s, "CP calls: %d (BG: %d)\n", |
| si->cp_count, si->bg_cp_count); |
| seq_printf(s, "GC calls: %d (BG: %d)\n", |
| si->call_count, si->bg_gc); |
| seq_printf(s, " - data segments : %d (%d)\n", |
| si->data_segs, si->bg_data_segs); |
| seq_printf(s, " - node segments : %d (%d)\n", |
| si->node_segs, si->bg_node_segs); |
| 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_puts(s, "\nExtent Cache:\n"); |
| seq_printf(s, " - Hit Count: L1-1:%llu L1-2:%llu L2:%llu\n", |
| si->hit_largest, si->hit_cached, |
| si->hit_rbtree); |
| seq_printf(s, " - Hit Ratio: %llu%% (%llu / %llu)\n", |
| !si->total_ext ? 0 : |
| div64_u64(si->hit_total * 100, si->total_ext), |
| si->hit_total, si->total_ext); |
| seq_printf(s, " - Inner Struct Count: tree: %d(%d), node: %d\n", |
| si->ext_tree, si->zombie_tree, si->ext_node); |
| seq_puts(s, "\nBalancing F2FS Async:\n"); |
| seq_printf(s, " - IO (CP: %4d, Data: %4d, Flush: (%4d %4d), " |
| "Discard: (%4d %4d)) cmd: %4d undiscard:%4u\n", |
| si->nr_wb_cp_data, si->nr_wb_data, |
| si->nr_flushing, si->nr_flushed, |
| si->nr_discarding, si->nr_discarded, |
| si->nr_discard_cmd, si->undiscard_blks); |
| seq_printf(s, " - inmem: %4d, atomic IO: %4d (Max. %4d), " |
| "volatile IO: %4d (Max. %4d)\n", |
| si->inmem_pages, si->aw_cnt, si->max_aw_cnt, |
| si->vw_cnt, si->max_vw_cnt); |
| 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, " - datas: %4d in files:%4d\n", |
| si->ndirty_data, si->ndirty_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, " - NATs: %9d/%9d\n - SITs: %9d/%9d\n", |
| si->dirty_nats, si->nats, si->dirty_sits, si->sits); |
| seq_printf(s, " - free_nids: %9d, alloc_nids: %9d\n", |
| si->free_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 */ |
| update_sit_info(si->sbi); |
| seq_printf(s, "\nBDF: %u, avg. vblocks: %u\n", |
| si->bimodal, si->avg_vblocks); |
| |
| /* memory footprint */ |
| update_mem_info(si->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: %llu KB\n", |
| si->cache_mem >> 10); |
| seq_printf(s, " - paged : %llu KB\n", |
| si->page_mem >> 10); |
| } |
| mutex_unlock(&f2fs_stat_mutex); |
| return 0; |
| } |
| |
| static int stat_open(struct inode *inode, struct file *file) |
| { |
| return single_open(file, stat_show, inode->i_private); |
| } |
| |
| static const struct file_operations stat_fops = { |
| .owner = THIS_MODULE, |
| .open = stat_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = single_release, |
| }; |
| |
| int f2fs_build_stats(struct f2fs_sb_info *sbi) |
| { |
| struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi); |
| struct f2fs_stat_info *si; |
| |
| si = kzalloc(sizeof(struct f2fs_stat_info), GFP_KERNEL); |
| if (!si) |
| return -ENOMEM; |
| |
| 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; |
| |
| atomic64_set(&sbi->total_hit_ext, 0); |
| atomic64_set(&sbi->read_hit_rbtree, 0); |
| atomic64_set(&sbi->read_hit_largest, 0); |
| atomic64_set(&sbi->read_hit_cached, 0); |
| |
| atomic_set(&sbi->inline_xattr, 0); |
| atomic_set(&sbi->inline_inode, 0); |
| atomic_set(&sbi->inline_dir, 0); |
| atomic_set(&sbi->inplace_count, 0); |
| |
| atomic_set(&sbi->aw_cnt, 0); |
| atomic_set(&sbi->vw_cnt, 0); |
| atomic_set(&sbi->max_aw_cnt, 0); |
| atomic_set(&sbi->max_vw_cnt, 0); |
| |
| mutex_lock(&f2fs_stat_mutex); |
| list_add_tail(&si->stat_list, &f2fs_stat_list); |
| mutex_unlock(&f2fs_stat_mutex); |
| |
| return 0; |
| } |
| |
| void f2fs_destroy_stats(struct f2fs_sb_info *sbi) |
| { |
| struct f2fs_stat_info *si = F2FS_STAT(sbi); |
| |
| mutex_lock(&f2fs_stat_mutex); |
| list_del(&si->stat_list); |
| mutex_unlock(&f2fs_stat_mutex); |
| |
| kfree(si); |
| } |
| |
| int __init f2fs_create_root_stats(void) |
| { |
| struct dentry *file; |
| |
| f2fs_debugfs_root = debugfs_create_dir("f2fs", NULL); |
| if (!f2fs_debugfs_root) |
| return -ENOMEM; |
| |
| file = debugfs_create_file("status", S_IRUGO, f2fs_debugfs_root, |
| NULL, &stat_fops); |
| if (!file) { |
| debugfs_remove(f2fs_debugfs_root); |
| f2fs_debugfs_root = NULL; |
| return -ENOMEM; |
| } |
| |
| return 0; |
| } |
| |
| void f2fs_destroy_root_stats(void) |
| { |
| if (!f2fs_debugfs_root) |
| return; |
| |
| debugfs_remove_recursive(f2fs_debugfs_root); |
| f2fs_debugfs_root = NULL; |
| } |