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Merge branch 'for-4.13-part3' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave...
[mirror_ubuntu-artful-kernel.git] / 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_imeta = get_pages(sbi, F2FS_DIRTY_IMETA);
49 si->ndirty_dirs = sbi->ndirty_inode[DIR_INODE];
50 si->ndirty_files = sbi->ndirty_inode[FILE_INODE];
51 si->ndirty_all = sbi->ndirty_inode[DIRTY_META];
52 si->inmem_pages = get_pages(sbi, F2FS_INMEM_PAGES);
53 si->aw_cnt = atomic_read(&sbi->aw_cnt);
54 si->vw_cnt = atomic_read(&sbi->vw_cnt);
55 si->max_aw_cnt = atomic_read(&sbi->max_aw_cnt);
56 si->max_vw_cnt = atomic_read(&sbi->max_vw_cnt);
57 si->nr_wb_cp_data = get_pages(sbi, F2FS_WB_CP_DATA);
58 si->nr_wb_data = get_pages(sbi, F2FS_WB_DATA);
59 if (SM_I(sbi) && SM_I(sbi)->fcc_info) {
60 si->nr_flushed =
61 atomic_read(&SM_I(sbi)->fcc_info->issued_flush);
62 si->nr_flushing =
63 atomic_read(&SM_I(sbi)->fcc_info->issing_flush);
64 }
65 if (SM_I(sbi) && SM_I(sbi)->dcc_info) {
66 si->nr_discarded =
67 atomic_read(&SM_I(sbi)->dcc_info->issued_discard);
68 si->nr_discarding =
69 atomic_read(&SM_I(sbi)->dcc_info->issing_discard);
70 si->nr_discard_cmd =
71 atomic_read(&SM_I(sbi)->dcc_info->discard_cmd_cnt);
72 si->undiscard_blks = SM_I(sbi)->dcc_info->undiscard_blks;
73 }
74 si->total_count = (int)sbi->user_block_count / sbi->blocks_per_seg;
75 si->rsvd_segs = reserved_segments(sbi);
76 si->overp_segs = overprovision_segments(sbi);
77 si->valid_count = valid_user_blocks(sbi);
78 si->discard_blks = discard_blocks(sbi);
79 si->valid_node_count = valid_node_count(sbi);
80 si->valid_inode_count = valid_inode_count(sbi);
81 si->inline_xattr = atomic_read(&sbi->inline_xattr);
82 si->inline_inode = atomic_read(&sbi->inline_inode);
83 si->inline_dir = atomic_read(&sbi->inline_dir);
84 si->append = sbi->im[APPEND_INO].ino_num;
85 si->update = sbi->im[UPDATE_INO].ino_num;
86 si->orphans = sbi->im[ORPHAN_INO].ino_num;
87 si->utilization = utilization(sbi);
88
89 si->free_segs = free_segments(sbi);
90 si->free_secs = free_sections(sbi);
91 si->prefree_count = prefree_segments(sbi);
92 si->dirty_count = dirty_segments(sbi);
93 si->node_pages = NODE_MAPPING(sbi)->nrpages;
94 si->meta_pages = META_MAPPING(sbi)->nrpages;
95 si->nats = NM_I(sbi)->nat_cnt;
96 si->dirty_nats = NM_I(sbi)->dirty_nat_cnt;
97 si->sits = MAIN_SEGS(sbi);
98 si->dirty_sits = SIT_I(sbi)->dirty_sentries;
99 si->free_nids = NM_I(sbi)->nid_cnt[FREE_NID_LIST];
100 si->avail_nids = NM_I(sbi)->available_nids;
101 si->alloc_nids = NM_I(sbi)->nid_cnt[ALLOC_NID_LIST];
102 si->bg_gc = sbi->bg_gc;
103 si->util_free = (int)(free_user_blocks(sbi) >> sbi->log_blocks_per_seg)
104 * 100 / (int)(sbi->user_block_count >> sbi->log_blocks_per_seg)
105 / 2;
106 si->util_valid = (int)(written_block_count(sbi) >>
107 sbi->log_blocks_per_seg)
108 * 100 / (int)(sbi->user_block_count >> sbi->log_blocks_per_seg)
109 / 2;
110 si->util_invalid = 50 - si->util_free - si->util_valid;
111 for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_NODE; i++) {
112 struct curseg_info *curseg = CURSEG_I(sbi, i);
113 si->curseg[i] = curseg->segno;
114 si->cursec[i] = GET_SEC_FROM_SEG(sbi, curseg->segno);
115 si->curzone[i] = GET_ZONE_FROM_SEC(sbi, si->cursec[i]);
116 }
117
118 for (i = 0; i < 2; i++) {
119 si->segment_count[i] = sbi->segment_count[i];
120 si->block_count[i] = sbi->block_count[i];
121 }
122
123 si->inplace_count = atomic_read(&sbi->inplace_count);
124 }
125
126 /*
127 * This function calculates BDF of every segments
128 */
129 static void update_sit_info(struct f2fs_sb_info *sbi)
130 {
131 struct f2fs_stat_info *si = F2FS_STAT(sbi);
132 unsigned long long blks_per_sec, hblks_per_sec, total_vblocks;
133 unsigned long long bimodal, dist;
134 unsigned int segno, vblocks;
135 int ndirty = 0;
136
137 bimodal = 0;
138 total_vblocks = 0;
139 blks_per_sec = BLKS_PER_SEC(sbi);
140 hblks_per_sec = blks_per_sec / 2;
141 for (segno = 0; segno < MAIN_SEGS(sbi); segno += sbi->segs_per_sec) {
142 vblocks = get_valid_blocks(sbi, segno, true);
143 dist = abs(vblocks - hblks_per_sec);
144 bimodal += dist * dist;
145
146 if (vblocks > 0 && vblocks < blks_per_sec) {
147 total_vblocks += vblocks;
148 ndirty++;
149 }
150 }
151 dist = div_u64(MAIN_SECS(sbi) * hblks_per_sec * hblks_per_sec, 100);
152 si->bimodal = div64_u64(bimodal, dist);
153 if (si->dirty_count)
154 si->avg_vblocks = div_u64(total_vblocks, ndirty);
155 else
156 si->avg_vblocks = 0;
157 }
158
159 /*
160 * This function calculates memory footprint.
161 */
162 static void update_mem_info(struct f2fs_sb_info *sbi)
163 {
164 struct f2fs_stat_info *si = F2FS_STAT(sbi);
165 unsigned npages;
166 int i;
167
168 if (si->base_mem)
169 goto get_cache;
170
171 /* build stat */
172 si->base_mem = sizeof(struct f2fs_stat_info);
173
174 /* build superblock */
175 si->base_mem += sizeof(struct f2fs_sb_info) + sbi->sb->s_blocksize;
176 si->base_mem += 2 * sizeof(struct f2fs_inode_info);
177 si->base_mem += sizeof(*sbi->ckpt);
178 si->base_mem += sizeof(struct percpu_counter) * NR_COUNT_TYPE;
179
180 /* build sm */
181 si->base_mem += sizeof(struct f2fs_sm_info);
182
183 /* build sit */
184 si->base_mem += sizeof(struct sit_info);
185 si->base_mem += MAIN_SEGS(sbi) * sizeof(struct seg_entry);
186 si->base_mem += f2fs_bitmap_size(MAIN_SEGS(sbi));
187 si->base_mem += 2 * SIT_VBLOCK_MAP_SIZE * MAIN_SEGS(sbi);
188 if (f2fs_discard_en(sbi))
189 si->base_mem += SIT_VBLOCK_MAP_SIZE * MAIN_SEGS(sbi);
190 si->base_mem += SIT_VBLOCK_MAP_SIZE;
191 if (sbi->segs_per_sec > 1)
192 si->base_mem += MAIN_SECS(sbi) * sizeof(struct sec_entry);
193 si->base_mem += __bitmap_size(sbi, SIT_BITMAP);
194
195 /* build free segmap */
196 si->base_mem += sizeof(struct free_segmap_info);
197 si->base_mem += f2fs_bitmap_size(MAIN_SEGS(sbi));
198 si->base_mem += f2fs_bitmap_size(MAIN_SECS(sbi));
199
200 /* build curseg */
201 si->base_mem += sizeof(struct curseg_info) * NR_CURSEG_TYPE;
202 si->base_mem += PAGE_SIZE * NR_CURSEG_TYPE;
203
204 /* build dirty segmap */
205 si->base_mem += sizeof(struct dirty_seglist_info);
206 si->base_mem += NR_DIRTY_TYPE * f2fs_bitmap_size(MAIN_SEGS(sbi));
207 si->base_mem += f2fs_bitmap_size(MAIN_SECS(sbi));
208
209 /* build nm */
210 si->base_mem += sizeof(struct f2fs_nm_info);
211 si->base_mem += __bitmap_size(sbi, NAT_BITMAP);
212 si->base_mem += (NM_I(sbi)->nat_bits_blocks << F2FS_BLKSIZE_BITS);
213 si->base_mem += NM_I(sbi)->nat_blocks * NAT_ENTRY_BITMAP_SIZE;
214 si->base_mem += NM_I(sbi)->nat_blocks / 8;
215 si->base_mem += NM_I(sbi)->nat_blocks * sizeof(unsigned short);
216
217 get_cache:
218 si->cache_mem = 0;
219
220 /* build gc */
221 if (sbi->gc_thread)
222 si->cache_mem += sizeof(struct f2fs_gc_kthread);
223
224 /* build merge flush thread */
225 if (SM_I(sbi)->fcc_info)
226 si->cache_mem += sizeof(struct flush_cmd_control);
227 if (SM_I(sbi)->dcc_info) {
228 si->cache_mem += sizeof(struct discard_cmd_control);
229 si->cache_mem += sizeof(struct discard_cmd) *
230 atomic_read(&SM_I(sbi)->dcc_info->discard_cmd_cnt);
231 }
232
233 /* free nids */
234 si->cache_mem += (NM_I(sbi)->nid_cnt[FREE_NID_LIST] +
235 NM_I(sbi)->nid_cnt[ALLOC_NID_LIST]) *
236 sizeof(struct free_nid);
237 si->cache_mem += NM_I(sbi)->nat_cnt * sizeof(struct nat_entry);
238 si->cache_mem += NM_I(sbi)->dirty_nat_cnt *
239 sizeof(struct nat_entry_set);
240 si->cache_mem += si->inmem_pages * sizeof(struct inmem_pages);
241 for (i = 0; i <= ORPHAN_INO; i++)
242 si->cache_mem += sbi->im[i].ino_num * sizeof(struct ino_entry);
243 si->cache_mem += atomic_read(&sbi->total_ext_tree) *
244 sizeof(struct extent_tree);
245 si->cache_mem += atomic_read(&sbi->total_ext_node) *
246 sizeof(struct extent_node);
247
248 si->page_mem = 0;
249 npages = NODE_MAPPING(sbi)->nrpages;
250 si->page_mem += (unsigned long long)npages << PAGE_SHIFT;
251 npages = META_MAPPING(sbi)->nrpages;
252 si->page_mem += (unsigned long long)npages << PAGE_SHIFT;
253 }
254
255 static int stat_show(struct seq_file *s, void *v)
256 {
257 struct f2fs_stat_info *si;
258 int i = 0;
259 int j;
260
261 mutex_lock(&f2fs_stat_mutex);
262 list_for_each_entry(si, &f2fs_stat_list, stat_list) {
263 update_general_status(si->sbi);
264
265 seq_printf(s, "\n=====[ partition info(%pg). #%d, %s]=====\n",
266 si->sbi->sb->s_bdev, i++,
267 f2fs_readonly(si->sbi->sb) ? "RO": "RW");
268 seq_printf(s, "[SB: 1] [CP: 2] [SIT: %d] [NAT: %d] ",
269 si->sit_area_segs, si->nat_area_segs);
270 seq_printf(s, "[SSA: %d] [MAIN: %d",
271 si->ssa_area_segs, si->main_area_segs);
272 seq_printf(s, "(OverProv:%d Resv:%d)]\n\n",
273 si->overp_segs, si->rsvd_segs);
274 if (test_opt(si->sbi, DISCARD))
275 seq_printf(s, "Utilization: %u%% (%u valid blocks, %u discard blocks)\n",
276 si->utilization, si->valid_count, si->discard_blks);
277 else
278 seq_printf(s, "Utilization: %u%% (%u valid blocks)\n",
279 si->utilization, si->valid_count);
280
281 seq_printf(s, " - Node: %u (Inode: %u, ",
282 si->valid_node_count, si->valid_inode_count);
283 seq_printf(s, "Other: %u)\n - Data: %u\n",
284 si->valid_node_count - si->valid_inode_count,
285 si->valid_count - si->valid_node_count);
286 seq_printf(s, " - Inline_xattr Inode: %u\n",
287 si->inline_xattr);
288 seq_printf(s, " - Inline_data Inode: %u\n",
289 si->inline_inode);
290 seq_printf(s, " - Inline_dentry Inode: %u\n",
291 si->inline_dir);
292 seq_printf(s, " - Orphan/Append/Update Inode: %u, %u, %u\n",
293 si->orphans, si->append, si->update);
294 seq_printf(s, "\nMain area: %d segs, %d secs %d zones\n",
295 si->main_area_segs, si->main_area_sections,
296 si->main_area_zones);
297 seq_printf(s, " - COLD data: %d, %d, %d\n",
298 si->curseg[CURSEG_COLD_DATA],
299 si->cursec[CURSEG_COLD_DATA],
300 si->curzone[CURSEG_COLD_DATA]);
301 seq_printf(s, " - WARM data: %d, %d, %d\n",
302 si->curseg[CURSEG_WARM_DATA],
303 si->cursec[CURSEG_WARM_DATA],
304 si->curzone[CURSEG_WARM_DATA]);
305 seq_printf(s, " - HOT data: %d, %d, %d\n",
306 si->curseg[CURSEG_HOT_DATA],
307 si->cursec[CURSEG_HOT_DATA],
308 si->curzone[CURSEG_HOT_DATA]);
309 seq_printf(s, " - Dir dnode: %d, %d, %d\n",
310 si->curseg[CURSEG_HOT_NODE],
311 si->cursec[CURSEG_HOT_NODE],
312 si->curzone[CURSEG_HOT_NODE]);
313 seq_printf(s, " - File dnode: %d, %d, %d\n",
314 si->curseg[CURSEG_WARM_NODE],
315 si->cursec[CURSEG_WARM_NODE],
316 si->curzone[CURSEG_WARM_NODE]);
317 seq_printf(s, " - Indir nodes: %d, %d, %d\n",
318 si->curseg[CURSEG_COLD_NODE],
319 si->cursec[CURSEG_COLD_NODE],
320 si->curzone[CURSEG_COLD_NODE]);
321 seq_printf(s, "\n - Valid: %d\n - Dirty: %d\n",
322 si->main_area_segs - si->dirty_count -
323 si->prefree_count - si->free_segs,
324 si->dirty_count);
325 seq_printf(s, " - Prefree: %d\n - Free: %d (%d)\n\n",
326 si->prefree_count, si->free_segs, si->free_secs);
327 seq_printf(s, "CP calls: %d (BG: %d)\n",
328 si->cp_count, si->bg_cp_count);
329 seq_printf(s, "GC calls: %d (BG: %d)\n",
330 si->call_count, si->bg_gc);
331 seq_printf(s, " - data segments : %d (%d)\n",
332 si->data_segs, si->bg_data_segs);
333 seq_printf(s, " - node segments : %d (%d)\n",
334 si->node_segs, si->bg_node_segs);
335 seq_printf(s, "Try to move %d blocks (BG: %d)\n", si->tot_blks,
336 si->bg_data_blks + si->bg_node_blks);
337 seq_printf(s, " - data blocks : %d (%d)\n", si->data_blks,
338 si->bg_data_blks);
339 seq_printf(s, " - node blocks : %d (%d)\n", si->node_blks,
340 si->bg_node_blks);
341 seq_puts(s, "\nExtent Cache:\n");
342 seq_printf(s, " - Hit Count: L1-1:%llu L1-2:%llu L2:%llu\n",
343 si->hit_largest, si->hit_cached,
344 si->hit_rbtree);
345 seq_printf(s, " - Hit Ratio: %llu%% (%llu / %llu)\n",
346 !si->total_ext ? 0 :
347 div64_u64(si->hit_total * 100, si->total_ext),
348 si->hit_total, si->total_ext);
349 seq_printf(s, " - Inner Struct Count: tree: %d(%d), node: %d\n",
350 si->ext_tree, si->zombie_tree, si->ext_node);
351 seq_puts(s, "\nBalancing F2FS Async:\n");
352 seq_printf(s, " - IO (CP: %4d, Data: %4d, Flush: (%4d %4d), "
353 "Discard: (%4d %4d)) cmd: %4d undiscard:%4u\n",
354 si->nr_wb_cp_data, si->nr_wb_data,
355 si->nr_flushing, si->nr_flushed,
356 si->nr_discarding, si->nr_discarded,
357 si->nr_discard_cmd, si->undiscard_blks);
358 seq_printf(s, " - inmem: %4d, atomic IO: %4d (Max. %4d), "
359 "volatile IO: %4d (Max. %4d)\n",
360 si->inmem_pages, si->aw_cnt, si->max_aw_cnt,
361 si->vw_cnt, si->max_vw_cnt);
362 seq_printf(s, " - nodes: %4d in %4d\n",
363 si->ndirty_node, si->node_pages);
364 seq_printf(s, " - dents: %4d in dirs:%4d (%4d)\n",
365 si->ndirty_dent, si->ndirty_dirs, si->ndirty_all);
366 seq_printf(s, " - datas: %4d in files:%4d\n",
367 si->ndirty_data, si->ndirty_files);
368 seq_printf(s, " - meta: %4d in %4d\n",
369 si->ndirty_meta, si->meta_pages);
370 seq_printf(s, " - imeta: %4d\n",
371 si->ndirty_imeta);
372 seq_printf(s, " - NATs: %9d/%9d\n - SITs: %9d/%9d\n",
373 si->dirty_nats, si->nats, si->dirty_sits, si->sits);
374 seq_printf(s, " - free_nids: %9d/%9d\n - alloc_nids: %9d\n",
375 si->free_nids, si->avail_nids, si->alloc_nids);
376 seq_puts(s, "\nDistribution of User Blocks:");
377 seq_puts(s, " [ valid | invalid | free ]\n");
378 seq_puts(s, " [");
379
380 for (j = 0; j < si->util_valid; j++)
381 seq_putc(s, '-');
382 seq_putc(s, '|');
383
384 for (j = 0; j < si->util_invalid; j++)
385 seq_putc(s, '-');
386 seq_putc(s, '|');
387
388 for (j = 0; j < si->util_free; j++)
389 seq_putc(s, '-');
390 seq_puts(s, "]\n\n");
391 seq_printf(s, "IPU: %u blocks\n", si->inplace_count);
392 seq_printf(s, "SSR: %u blocks in %u segments\n",
393 si->block_count[SSR], si->segment_count[SSR]);
394 seq_printf(s, "LFS: %u blocks in %u segments\n",
395 si->block_count[LFS], si->segment_count[LFS]);
396
397 /* segment usage info */
398 update_sit_info(si->sbi);
399 seq_printf(s, "\nBDF: %u, avg. vblocks: %u\n",
400 si->bimodal, si->avg_vblocks);
401
402 /* memory footprint */
403 update_mem_info(si->sbi);
404 seq_printf(s, "\nMemory: %llu KB\n",
405 (si->base_mem + si->cache_mem + si->page_mem) >> 10);
406 seq_printf(s, " - static: %llu KB\n",
407 si->base_mem >> 10);
408 seq_printf(s, " - cached: %llu KB\n",
409 si->cache_mem >> 10);
410 seq_printf(s, " - paged : %llu KB\n",
411 si->page_mem >> 10);
412 }
413 mutex_unlock(&f2fs_stat_mutex);
414 return 0;
415 }
416
417 static int stat_open(struct inode *inode, struct file *file)
418 {
419 return single_open(file, stat_show, inode->i_private);
420 }
421
422 static const struct file_operations stat_fops = {
423 .owner = THIS_MODULE,
424 .open = stat_open,
425 .read = seq_read,
426 .llseek = seq_lseek,
427 .release = single_release,
428 };
429
430 int f2fs_build_stats(struct f2fs_sb_info *sbi)
431 {
432 struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
433 struct f2fs_stat_info *si;
434
435 si = kzalloc(sizeof(struct f2fs_stat_info), GFP_KERNEL);
436 if (!si)
437 return -ENOMEM;
438
439 si->all_area_segs = le32_to_cpu(raw_super->segment_count);
440 si->sit_area_segs = le32_to_cpu(raw_super->segment_count_sit);
441 si->nat_area_segs = le32_to_cpu(raw_super->segment_count_nat);
442 si->ssa_area_segs = le32_to_cpu(raw_super->segment_count_ssa);
443 si->main_area_segs = le32_to_cpu(raw_super->segment_count_main);
444 si->main_area_sections = le32_to_cpu(raw_super->section_count);
445 si->main_area_zones = si->main_area_sections /
446 le32_to_cpu(raw_super->secs_per_zone);
447 si->sbi = sbi;
448 sbi->stat_info = si;
449
450 atomic64_set(&sbi->total_hit_ext, 0);
451 atomic64_set(&sbi->read_hit_rbtree, 0);
452 atomic64_set(&sbi->read_hit_largest, 0);
453 atomic64_set(&sbi->read_hit_cached, 0);
454
455 atomic_set(&sbi->inline_xattr, 0);
456 atomic_set(&sbi->inline_inode, 0);
457 atomic_set(&sbi->inline_dir, 0);
458 atomic_set(&sbi->inplace_count, 0);
459
460 atomic_set(&sbi->aw_cnt, 0);
461 atomic_set(&sbi->vw_cnt, 0);
462 atomic_set(&sbi->max_aw_cnt, 0);
463 atomic_set(&sbi->max_vw_cnt, 0);
464
465 mutex_lock(&f2fs_stat_mutex);
466 list_add_tail(&si->stat_list, &f2fs_stat_list);
467 mutex_unlock(&f2fs_stat_mutex);
468
469 return 0;
470 }
471
472 void f2fs_destroy_stats(struct f2fs_sb_info *sbi)
473 {
474 struct f2fs_stat_info *si = F2FS_STAT(sbi);
475
476 mutex_lock(&f2fs_stat_mutex);
477 list_del(&si->stat_list);
478 mutex_unlock(&f2fs_stat_mutex);
479
480 kfree(si);
481 }
482
483 int __init f2fs_create_root_stats(void)
484 {
485 struct dentry *file;
486
487 f2fs_debugfs_root = debugfs_create_dir("f2fs", NULL);
488 if (!f2fs_debugfs_root)
489 return -ENOMEM;
490
491 file = debugfs_create_file("status", S_IRUGO, f2fs_debugfs_root,
492 NULL, &stat_fops);
493 if (!file) {
494 debugfs_remove(f2fs_debugfs_root);
495 f2fs_debugfs_root = NULL;
496 return -ENOMEM;
497 }
498
499 return 0;
500 }
501
502 void f2fs_destroy_root_stats(void)
503 {
504 if (!f2fs_debugfs_root)
505 return;
506
507 debugfs_remove_recursive(f2fs_debugfs_root);
508 f2fs_debugfs_root = NULL;
509 }
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