41887e6ec1b3eeba7d4269353f0be282028444b5
[muen/linux.git] / fs / f2fs / sysfs.c
1 /*
2  * f2fs sysfs interface
3  *
4  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
5  *             http://www.samsung.com/
6  * Copyright (c) 2017 Chao Yu <chao@kernel.org>
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 as
10  * published by the Free Software Foundation.
11  */
12 #include <linux/proc_fs.h>
13 #include <linux/f2fs_fs.h>
14 #include <linux/seq_file.h>
15
16 #include "f2fs.h"
17 #include "segment.h"
18 #include "gc.h"
19
20 static struct proc_dir_entry *f2fs_proc_root;
21
22 /* Sysfs support for f2fs */
23 enum {
24         GC_THREAD,      /* struct f2fs_gc_thread */
25         SM_INFO,        /* struct f2fs_sm_info */
26         DCC_INFO,       /* struct discard_cmd_control */
27         NM_INFO,        /* struct f2fs_nm_info */
28         F2FS_SBI,       /* struct f2fs_sb_info */
29 #ifdef CONFIG_F2FS_FAULT_INJECTION
30         FAULT_INFO_RATE,        /* struct f2fs_fault_info */
31         FAULT_INFO_TYPE,        /* struct f2fs_fault_info */
32 #endif
33         RESERVED_BLOCKS,        /* struct f2fs_sb_info */
34 };
35
36 struct f2fs_attr {
37         struct attribute attr;
38         ssize_t (*show)(struct f2fs_attr *, struct f2fs_sb_info *, char *);
39         ssize_t (*store)(struct f2fs_attr *, struct f2fs_sb_info *,
40                          const char *, size_t);
41         int struct_type;
42         int offset;
43         int id;
44 };
45
46 static unsigned char *__struct_ptr(struct f2fs_sb_info *sbi, int struct_type)
47 {
48         if (struct_type == GC_THREAD)
49                 return (unsigned char *)sbi->gc_thread;
50         else if (struct_type == SM_INFO)
51                 return (unsigned char *)SM_I(sbi);
52         else if (struct_type == DCC_INFO)
53                 return (unsigned char *)SM_I(sbi)->dcc_info;
54         else if (struct_type == NM_INFO)
55                 return (unsigned char *)NM_I(sbi);
56         else if (struct_type == F2FS_SBI || struct_type == RESERVED_BLOCKS)
57                 return (unsigned char *)sbi;
58 #ifdef CONFIG_F2FS_FAULT_INJECTION
59         else if (struct_type == FAULT_INFO_RATE ||
60                                         struct_type == FAULT_INFO_TYPE)
61                 return (unsigned char *)&sbi->fault_info;
62 #endif
63         return NULL;
64 }
65
66 static ssize_t dirty_segments_show(struct f2fs_attr *a,
67                 struct f2fs_sb_info *sbi, char *buf)
68 {
69         return snprintf(buf, PAGE_SIZE, "%llu\n",
70                 (unsigned long long)(dirty_segments(sbi)));
71 }
72
73 static ssize_t lifetime_write_kbytes_show(struct f2fs_attr *a,
74                 struct f2fs_sb_info *sbi, char *buf)
75 {
76         struct super_block *sb = sbi->sb;
77
78         if (!sb->s_bdev->bd_part)
79                 return snprintf(buf, PAGE_SIZE, "0\n");
80
81         return snprintf(buf, PAGE_SIZE, "%llu\n",
82                 (unsigned long long)(sbi->kbytes_written +
83                         BD_PART_WRITTEN(sbi)));
84 }
85
86 static ssize_t features_show(struct f2fs_attr *a,
87                 struct f2fs_sb_info *sbi, char *buf)
88 {
89         struct super_block *sb = sbi->sb;
90         int len = 0;
91
92         if (!sb->s_bdev->bd_part)
93                 return snprintf(buf, PAGE_SIZE, "0\n");
94
95         if (f2fs_sb_has_crypto(sb))
96                 len += snprintf(buf, PAGE_SIZE - len, "%s",
97                                                 "encryption");
98         if (f2fs_sb_mounted_blkzoned(sb))
99                 len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
100                                 len ? ", " : "", "blkzoned");
101         if (f2fs_sb_has_extra_attr(sb))
102                 len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
103                                 len ? ", " : "", "extra_attr");
104         if (f2fs_sb_has_project_quota(sb))
105                 len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
106                                 len ? ", " : "", "projquota");
107         if (f2fs_sb_has_inode_chksum(sb))
108                 len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
109                                 len ? ", " : "", "inode_checksum");
110         if (f2fs_sb_has_flexible_inline_xattr(sb))
111                 len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
112                                 len ? ", " : "", "flexible_inline_xattr");
113         if (f2fs_sb_has_quota_ino(sb))
114                 len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
115                                 len ? ", " : "", "quota_ino");
116         len += snprintf(buf + len, PAGE_SIZE - len, "\n");
117         return len;
118 }
119
120 static ssize_t current_reserved_blocks_show(struct f2fs_attr *a,
121                                         struct f2fs_sb_info *sbi, char *buf)
122 {
123         return snprintf(buf, PAGE_SIZE, "%u\n", sbi->current_reserved_blocks);
124 }
125
126 static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
127                         struct f2fs_sb_info *sbi, char *buf)
128 {
129         unsigned char *ptr = NULL;
130         unsigned int *ui;
131
132         ptr = __struct_ptr(sbi, a->struct_type);
133         if (!ptr)
134                 return -EINVAL;
135
136         ui = (unsigned int *)(ptr + a->offset);
137
138         return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
139 }
140
141 static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
142                         struct f2fs_sb_info *sbi,
143                         const char *buf, size_t count)
144 {
145         unsigned char *ptr;
146         unsigned long t;
147         unsigned int *ui;
148         ssize_t ret;
149
150         ptr = __struct_ptr(sbi, a->struct_type);
151         if (!ptr)
152                 return -EINVAL;
153
154         ui = (unsigned int *)(ptr + a->offset);
155
156         ret = kstrtoul(skip_spaces(buf), 0, &t);
157         if (ret < 0)
158                 return ret;
159 #ifdef CONFIG_F2FS_FAULT_INJECTION
160         if (a->struct_type == FAULT_INFO_TYPE && t >= (1 << FAULT_MAX))
161                 return -EINVAL;
162 #endif
163         if (a->struct_type == RESERVED_BLOCKS) {
164                 spin_lock(&sbi->stat_lock);
165                 if (t > (unsigned long)(sbi->user_block_count -
166                                         sbi->root_reserved_blocks)) {
167                         spin_unlock(&sbi->stat_lock);
168                         return -EINVAL;
169                 }
170                 *ui = t;
171                 sbi->current_reserved_blocks = min(sbi->reserved_blocks,
172                                 sbi->user_block_count - valid_user_blocks(sbi));
173                 spin_unlock(&sbi->stat_lock);
174                 return count;
175         }
176
177         if (!strcmp(a->attr.name, "discard_granularity")) {
178                 if (t == 0 || t > MAX_PLIST_NUM)
179                         return -EINVAL;
180                 if (t == *ui)
181                         return count;
182                 *ui = t;
183                 return count;
184         }
185
186         *ui = t;
187
188         if (!strcmp(a->attr.name, "iostat_enable") && *ui == 0)
189                 f2fs_reset_iostat(sbi);
190         if (!strcmp(a->attr.name, "gc_urgent") && t == 1 && sbi->gc_thread) {
191                 sbi->gc_thread->gc_wake = 1;
192                 wake_up_interruptible_all(&sbi->gc_thread->gc_wait_queue_head);
193                 wake_up_discard_thread(sbi, true);
194         }
195
196         return count;
197 }
198
199 static ssize_t f2fs_attr_show(struct kobject *kobj,
200                                 struct attribute *attr, char *buf)
201 {
202         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
203                                                                 s_kobj);
204         struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
205
206         return a->show ? a->show(a, sbi, buf) : 0;
207 }
208
209 static ssize_t f2fs_attr_store(struct kobject *kobj, struct attribute *attr,
210                                                 const char *buf, size_t len)
211 {
212         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
213                                                                         s_kobj);
214         struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
215
216         return a->store ? a->store(a, sbi, buf, len) : 0;
217 }
218
219 static void f2fs_sb_release(struct kobject *kobj)
220 {
221         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
222                                                                 s_kobj);
223         complete(&sbi->s_kobj_unregister);
224 }
225
226 enum feat_id {
227         FEAT_CRYPTO = 0,
228         FEAT_BLKZONED,
229         FEAT_ATOMIC_WRITE,
230         FEAT_EXTRA_ATTR,
231         FEAT_PROJECT_QUOTA,
232         FEAT_INODE_CHECKSUM,
233         FEAT_FLEXIBLE_INLINE_XATTR,
234         FEAT_QUOTA_INO,
235 };
236
237 static ssize_t f2fs_feature_show(struct f2fs_attr *a,
238                 struct f2fs_sb_info *sbi, char *buf)
239 {
240         switch (a->id) {
241         case FEAT_CRYPTO:
242         case FEAT_BLKZONED:
243         case FEAT_ATOMIC_WRITE:
244         case FEAT_EXTRA_ATTR:
245         case FEAT_PROJECT_QUOTA:
246         case FEAT_INODE_CHECKSUM:
247         case FEAT_FLEXIBLE_INLINE_XATTR:
248         case FEAT_QUOTA_INO:
249                 return snprintf(buf, PAGE_SIZE, "supported\n");
250         }
251         return 0;
252 }
253
254 #define F2FS_ATTR_OFFSET(_struct_type, _name, _mode, _show, _store, _offset) \
255 static struct f2fs_attr f2fs_attr_##_name = {                   \
256         .attr = {.name = __stringify(_name), .mode = _mode },   \
257         .show   = _show,                                        \
258         .store  = _store,                                       \
259         .struct_type = _struct_type,                            \
260         .offset = _offset                                       \
261 }
262
263 #define F2FS_RW_ATTR(struct_type, struct_name, name, elname)    \
264         F2FS_ATTR_OFFSET(struct_type, name, 0644,               \
265                 f2fs_sbi_show, f2fs_sbi_store,                  \
266                 offsetof(struct struct_name, elname))
267
268 #define F2FS_GENERAL_RO_ATTR(name) \
269 static struct f2fs_attr f2fs_attr_##name = __ATTR(name, 0444, name##_show, NULL)
270
271 #define F2FS_FEATURE_RO_ATTR(_name, _id)                        \
272 static struct f2fs_attr f2fs_attr_##_name = {                   \
273         .attr = {.name = __stringify(_name), .mode = 0444 },    \
274         .show   = f2fs_feature_show,                            \
275         .id     = _id,                                          \
276 }
277
278 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_urgent_sleep_time,
279                                                         urgent_sleep_time);
280 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_min_sleep_time, min_sleep_time);
281 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_max_sleep_time, max_sleep_time);
282 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time);
283 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_idle, gc_idle);
284 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_urgent, gc_urgent);
285 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments);
286 F2FS_RW_ATTR(DCC_INFO, discard_cmd_control, max_small_discards, max_discards);
287 F2FS_RW_ATTR(DCC_INFO, discard_cmd_control, discard_granularity, discard_granularity);
288 F2FS_RW_ATTR(RESERVED_BLOCKS, f2fs_sb_info, reserved_blocks, reserved_blocks);
289 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, batched_trim_sections, trim_sections);
290 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy);
291 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util);
292 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_fsync_blocks, min_fsync_blocks);
293 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_hot_blocks, min_hot_blocks);
294 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ssr_sections, min_ssr_sections);
295 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ram_thresh, ram_thresh);
296 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ra_nid_pages, ra_nid_pages);
297 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, dirty_nats_ratio, dirty_nats_ratio);
298 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search);
299 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level);
300 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, cp_interval, interval_time[CP_TIME]);
301 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, idle_interval, interval_time[REQ_TIME]);
302 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, iostat_enable, iostat_enable);
303 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, readdir_ra, readdir_ra);
304 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, gc_pin_file_thresh, gc_pin_file_threshold);
305 #ifdef CONFIG_F2FS_FAULT_INJECTION
306 F2FS_RW_ATTR(FAULT_INFO_RATE, f2fs_fault_info, inject_rate, inject_rate);
307 F2FS_RW_ATTR(FAULT_INFO_TYPE, f2fs_fault_info, inject_type, inject_type);
308 #endif
309 F2FS_GENERAL_RO_ATTR(dirty_segments);
310 F2FS_GENERAL_RO_ATTR(lifetime_write_kbytes);
311 F2FS_GENERAL_RO_ATTR(features);
312 F2FS_GENERAL_RO_ATTR(current_reserved_blocks);
313
314 #ifdef CONFIG_F2FS_FS_ENCRYPTION
315 F2FS_FEATURE_RO_ATTR(encryption, FEAT_CRYPTO);
316 #endif
317 #ifdef CONFIG_BLK_DEV_ZONED
318 F2FS_FEATURE_RO_ATTR(block_zoned, FEAT_BLKZONED);
319 #endif
320 F2FS_FEATURE_RO_ATTR(atomic_write, FEAT_ATOMIC_WRITE);
321 F2FS_FEATURE_RO_ATTR(extra_attr, FEAT_EXTRA_ATTR);
322 F2FS_FEATURE_RO_ATTR(project_quota, FEAT_PROJECT_QUOTA);
323 F2FS_FEATURE_RO_ATTR(inode_checksum, FEAT_INODE_CHECKSUM);
324 F2FS_FEATURE_RO_ATTR(flexible_inline_xattr, FEAT_FLEXIBLE_INLINE_XATTR);
325 F2FS_FEATURE_RO_ATTR(quota_ino, FEAT_QUOTA_INO);
326
327 #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
328 static struct attribute *f2fs_attrs[] = {
329         ATTR_LIST(gc_urgent_sleep_time),
330         ATTR_LIST(gc_min_sleep_time),
331         ATTR_LIST(gc_max_sleep_time),
332         ATTR_LIST(gc_no_gc_sleep_time),
333         ATTR_LIST(gc_idle),
334         ATTR_LIST(gc_urgent),
335         ATTR_LIST(reclaim_segments),
336         ATTR_LIST(max_small_discards),
337         ATTR_LIST(discard_granularity),
338         ATTR_LIST(batched_trim_sections),
339         ATTR_LIST(ipu_policy),
340         ATTR_LIST(min_ipu_util),
341         ATTR_LIST(min_fsync_blocks),
342         ATTR_LIST(min_hot_blocks),
343         ATTR_LIST(min_ssr_sections),
344         ATTR_LIST(max_victim_search),
345         ATTR_LIST(dir_level),
346         ATTR_LIST(ram_thresh),
347         ATTR_LIST(ra_nid_pages),
348         ATTR_LIST(dirty_nats_ratio),
349         ATTR_LIST(cp_interval),
350         ATTR_LIST(idle_interval),
351         ATTR_LIST(iostat_enable),
352         ATTR_LIST(readdir_ra),
353         ATTR_LIST(gc_pin_file_thresh),
354 #ifdef CONFIG_F2FS_FAULT_INJECTION
355         ATTR_LIST(inject_rate),
356         ATTR_LIST(inject_type),
357 #endif
358         ATTR_LIST(dirty_segments),
359         ATTR_LIST(lifetime_write_kbytes),
360         ATTR_LIST(features),
361         ATTR_LIST(reserved_blocks),
362         ATTR_LIST(current_reserved_blocks),
363         NULL,
364 };
365
366 static struct attribute *f2fs_feat_attrs[] = {
367 #ifdef CONFIG_F2FS_FS_ENCRYPTION
368         ATTR_LIST(encryption),
369 #endif
370 #ifdef CONFIG_BLK_DEV_ZONED
371         ATTR_LIST(block_zoned),
372 #endif
373         ATTR_LIST(atomic_write),
374         ATTR_LIST(extra_attr),
375         ATTR_LIST(project_quota),
376         ATTR_LIST(inode_checksum),
377         ATTR_LIST(flexible_inline_xattr),
378         ATTR_LIST(quota_ino),
379         NULL,
380 };
381
382 static const struct sysfs_ops f2fs_attr_ops = {
383         .show   = f2fs_attr_show,
384         .store  = f2fs_attr_store,
385 };
386
387 static struct kobj_type f2fs_sb_ktype = {
388         .default_attrs  = f2fs_attrs,
389         .sysfs_ops      = &f2fs_attr_ops,
390         .release        = f2fs_sb_release,
391 };
392
393 static struct kobj_type f2fs_ktype = {
394         .sysfs_ops      = &f2fs_attr_ops,
395 };
396
397 static struct kset f2fs_kset = {
398         .kobj   = {.ktype = &f2fs_ktype},
399 };
400
401 static struct kobj_type f2fs_feat_ktype = {
402         .default_attrs  = f2fs_feat_attrs,
403         .sysfs_ops      = &f2fs_attr_ops,
404 };
405
406 static struct kobject f2fs_feat = {
407         .kset   = &f2fs_kset,
408 };
409
410 static int segment_info_seq_show(struct seq_file *seq, void *offset)
411 {
412         struct super_block *sb = seq->private;
413         struct f2fs_sb_info *sbi = F2FS_SB(sb);
414         unsigned int total_segs =
415                         le32_to_cpu(sbi->raw_super->segment_count_main);
416         int i;
417
418         seq_puts(seq, "format: segment_type|valid_blocks\n"
419                 "segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");
420
421         for (i = 0; i < total_segs; i++) {
422                 struct seg_entry *se = get_seg_entry(sbi, i);
423
424                 if ((i % 10) == 0)
425                         seq_printf(seq, "%-10d", i);
426                 seq_printf(seq, "%d|%-3u", se->type,
427                                         get_valid_blocks(sbi, i, false));
428                 if ((i % 10) == 9 || i == (total_segs - 1))
429                         seq_putc(seq, '\n');
430                 else
431                         seq_putc(seq, ' ');
432         }
433
434         return 0;
435 }
436
437 static int segment_bits_seq_show(struct seq_file *seq, void *offset)
438 {
439         struct super_block *sb = seq->private;
440         struct f2fs_sb_info *sbi = F2FS_SB(sb);
441         unsigned int total_segs =
442                         le32_to_cpu(sbi->raw_super->segment_count_main);
443         int i, j;
444
445         seq_puts(seq, "format: segment_type|valid_blocks|bitmaps\n"
446                 "segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");
447
448         for (i = 0; i < total_segs; i++) {
449                 struct seg_entry *se = get_seg_entry(sbi, i);
450
451                 seq_printf(seq, "%-10d", i);
452                 seq_printf(seq, "%d|%-3u|", se->type,
453                                         get_valid_blocks(sbi, i, false));
454                 for (j = 0; j < SIT_VBLOCK_MAP_SIZE; j++)
455                         seq_printf(seq, " %.2x", se->cur_valid_map[j]);
456                 seq_putc(seq, '\n');
457         }
458         return 0;
459 }
460
461 static int iostat_info_seq_show(struct seq_file *seq, void *offset)
462 {
463         struct super_block *sb = seq->private;
464         struct f2fs_sb_info *sbi = F2FS_SB(sb);
465         time64_t now = ktime_get_real_seconds();
466
467         if (!sbi->iostat_enable)
468                 return 0;
469
470         seq_printf(seq, "time:          %-16llu\n", now);
471
472         /* print app IOs */
473         seq_printf(seq, "app buffered:  %-16llu\n",
474                                 sbi->write_iostat[APP_BUFFERED_IO]);
475         seq_printf(seq, "app direct:    %-16llu\n",
476                                 sbi->write_iostat[APP_DIRECT_IO]);
477         seq_printf(seq, "app mapped:    %-16llu\n",
478                                 sbi->write_iostat[APP_MAPPED_IO]);
479
480         /* print fs IOs */
481         seq_printf(seq, "fs data:       %-16llu\n",
482                                 sbi->write_iostat[FS_DATA_IO]);
483         seq_printf(seq, "fs node:       %-16llu\n",
484                                 sbi->write_iostat[FS_NODE_IO]);
485         seq_printf(seq, "fs meta:       %-16llu\n",
486                                 sbi->write_iostat[FS_META_IO]);
487         seq_printf(seq, "fs gc data:    %-16llu\n",
488                                 sbi->write_iostat[FS_GC_DATA_IO]);
489         seq_printf(seq, "fs gc node:    %-16llu\n",
490                                 sbi->write_iostat[FS_GC_NODE_IO]);
491         seq_printf(seq, "fs cp data:    %-16llu\n",
492                                 sbi->write_iostat[FS_CP_DATA_IO]);
493         seq_printf(seq, "fs cp node:    %-16llu\n",
494                                 sbi->write_iostat[FS_CP_NODE_IO]);
495         seq_printf(seq, "fs cp meta:    %-16llu\n",
496                                 sbi->write_iostat[FS_CP_META_IO]);
497         seq_printf(seq, "fs discard:    %-16llu\n",
498                                 sbi->write_iostat[FS_DISCARD]);
499
500         return 0;
501 }
502
503 #define F2FS_PROC_FILE_DEF(_name)                                       \
504 static int _name##_open_fs(struct inode *inode, struct file *file)      \
505 {                                                                       \
506         return single_open(file, _name##_seq_show, PDE_DATA(inode));    \
507 }                                                                       \
508                                                                         \
509 static const struct file_operations f2fs_seq_##_name##_fops = {         \
510         .open = _name##_open_fs,                                        \
511         .read = seq_read,                                               \
512         .llseek = seq_lseek,                                            \
513         .release = single_release,                                      \
514 };
515
516 F2FS_PROC_FILE_DEF(segment_info);
517 F2FS_PROC_FILE_DEF(segment_bits);
518 F2FS_PROC_FILE_DEF(iostat_info);
519
520 int __init f2fs_init_sysfs(void)
521 {
522         int ret;
523
524         kobject_set_name(&f2fs_kset.kobj, "f2fs");
525         f2fs_kset.kobj.parent = fs_kobj;
526         ret = kset_register(&f2fs_kset);
527         if (ret)
528                 return ret;
529
530         ret = kobject_init_and_add(&f2fs_feat, &f2fs_feat_ktype,
531                                    NULL, "features");
532         if (ret)
533                 kset_unregister(&f2fs_kset);
534         else
535                 f2fs_proc_root = proc_mkdir("fs/f2fs", NULL);
536         return ret;
537 }
538
539 void f2fs_exit_sysfs(void)
540 {
541         kobject_put(&f2fs_feat);
542         kset_unregister(&f2fs_kset);
543         remove_proc_entry("fs/f2fs", NULL);
544         f2fs_proc_root = NULL;
545 }
546
547 int f2fs_register_sysfs(struct f2fs_sb_info *sbi)
548 {
549         struct super_block *sb = sbi->sb;
550         int err;
551
552         sbi->s_kobj.kset = &f2fs_kset;
553         init_completion(&sbi->s_kobj_unregister);
554         err = kobject_init_and_add(&sbi->s_kobj, &f2fs_sb_ktype, NULL,
555                                 "%s", sb->s_id);
556         if (err)
557                 return err;
558
559         if (f2fs_proc_root)
560                 sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);
561
562         if (sbi->s_proc) {
563                 proc_create_data("segment_info", S_IRUGO, sbi->s_proc,
564                                  &f2fs_seq_segment_info_fops, sb);
565                 proc_create_data("segment_bits", S_IRUGO, sbi->s_proc,
566                                  &f2fs_seq_segment_bits_fops, sb);
567                 proc_create_data("iostat_info", S_IRUGO, sbi->s_proc,
568                                 &f2fs_seq_iostat_info_fops, sb);
569         }
570         return 0;
571 }
572
573 void f2fs_unregister_sysfs(struct f2fs_sb_info *sbi)
574 {
575         if (sbi->s_proc) {
576                 remove_proc_entry("iostat_info", sbi->s_proc);
577                 remove_proc_entry("segment_info", sbi->s_proc);
578                 remove_proc_entry("segment_bits", sbi->s_proc);
579                 remove_proc_entry(sbi->sb->s_id, f2fs_proc_root);
580         }
581         kobject_del(&sbi->s_kobj);
582 }