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