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 <[email protected]>
   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         len += snprintf(buf + len, PAGE_SIZE - len, "\n");
 114         return len;
 115 }
 116
 117 static ssize_t current_reserved_blocks_show(struct f2fs_attr *a,
 118                                         struct f2fs_sb_info *sbi, char *buf)
 119 {
 120         return snprintf(buf, PAGE_SIZE, "%u\n", sbi->current_reserved_blocks);
 121 }
 122
 123 static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
 124                         struct f2fs_sb_info *sbi, char *buf)
 125 {
 126         unsigned char *ptr = NULL;
 127         unsigned int *ui;
 128
 129         ptr = __struct_ptr(sbi, a->struct_type);
 130         if (!ptr)
 131                 return -EINVAL;
 132
 133         ui = (unsigned int *)(ptr + a->offset);
 134
 135         return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
 136 }
 137
 138 static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
 139                         struct f2fs_sb_info *sbi,
 140                         const char *buf, size_t count)
 141 {
 142         unsigned char *ptr;
 143         unsigned long t;
 144         unsigned int *ui;
 145         ssize_t ret;
 146
 147         ptr = __struct_ptr(sbi, a->struct_type);
 148         if (!ptr)
 149                 return -EINVAL;
 150
 151         ui = (unsigned int *)(ptr + a->offset);
 152
 153         ret = kstrtoul(skip_spaces(buf), 0, &t);
 154         if (ret < 0)
 155                 return ret;
 156 #ifdef CONFIG_F2FS_FAULT_INJECTION
 157         if (a->struct_type == FAULT_INFO_TYPE && t >= (1 << FAULT_MAX))
 158                 return -EINVAL;
 159 #endif
 160         if (a->struct_type == RESERVED_BLOCKS) {
 161                 spin_lock(&sbi->stat_lock);
 162                 if (t > (unsigned long)sbi->user_block_count) {
 163                         spin_unlock(&sbi->stat_lock);
 164                         return -EINVAL;
 165                 }
 166                 *ui = t;
 167                 sbi->current_reserved_blocks = min(sbi->reserved_blocks,
 168                                 sbi->user_block_count - valid_user_blocks(sbi));
 169                 spin_unlock(&sbi->stat_lock);
 170                 return count;
 171         }
 172
 173         if (!strcmp(a->attr.name, "discard_granularity")) {
 174                 if (t == 0 || t > MAX_PLIST_NUM)
 175                         return -EINVAL;
 176                 if (t == *ui)
 177                         return count;
 178                 *ui = t;
 179                 return count;
 180         }
 181
 182         *ui = t;
 183
 184         if (!strcmp(a->attr.name, "iostat_enable") && *ui == 0)
 185                 f2fs_reset_iostat(sbi);
 186         if (!strcmp(a->attr.name, "gc_urgent") && t == 1 && sbi->gc_thread) {
 187                 sbi->gc_thread->gc_wake = 1;
 188                 wake_up_interruptible_all(&sbi->gc_thread->gc_wait_queue_head);
 189                 wake_up_discard_thread(sbi, true);
 190         }
 191
 192         return count;
 193 }
 194
 195 static ssize_t f2fs_attr_show(struct kobject *kobj,
 196                                 struct attribute *attr, char *buf)
 197 {
 198         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
 199                                                                 s_kobj);
 200         struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
 201
 202         return a->show ? a->show(a, sbi, buf) : 0;
 203 }
 204
 205 static ssize_t f2fs_attr_store(struct kobject *kobj, struct attribute *attr,
 206                                                 const char *buf, size_t len)
 207 {
 208         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
 209                                                                         s_kobj);
 210         struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
 211
 212         return a->store ? a->store(a, sbi, buf, len) : 0;
 213 }
 214
 215 static void f2fs_sb_release(struct kobject *kobj)
 216 {
 217         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
 218                                                                 s_kobj);
 219         complete(&sbi->s_kobj_unregister);
 220 }
 221
 222 enum feat_id {
 223         FEAT_CRYPTO = 0,
 224         FEAT_BLKZONED,
 225         FEAT_ATOMIC_WRITE,
 226         FEAT_EXTRA_ATTR,
 227         FEAT_PROJECT_QUOTA,
 228         FEAT_INODE_CHECKSUM,
 229         FEAT_FLEXIBLE_INLINE_XATTR,
 230 };
 231
 232 static ssize_t f2fs_feature_show(struct f2fs_attr *a,
 233                 struct f2fs_sb_info *sbi, char *buf)
 234 {
 235         switch (a->id) {
 236         case FEAT_CRYPTO:
 237         case FEAT_BLKZONED:
 238         case FEAT_ATOMIC_WRITE:
 239         case FEAT_EXTRA_ATTR:
 240         case FEAT_PROJECT_QUOTA:
 241         case FEAT_INODE_CHECKSUM:
 242         case FEAT_FLEXIBLE_INLINE_XATTR:
 243                 return snprintf(buf, PAGE_SIZE, "supported\n");
 244         }
 245         return 0;
 246 }
 247
 248 #define F2FS_ATTR_OFFSET(_struct_type, _name, _mode, _show, _store, _offset) \
 249 static struct f2fs_attr f2fs_attr_##_name = {                   \
 250         .attr = {.name = __stringify(_name), .mode = _mode },   \
 251         .show   = _show,                                        \
 252         .store  = _store,                                       \
 253         .struct_type = _struct_type,                            \
 254         .offset = _offset                                       \
 255 }
 256
 257 #define F2FS_RW_ATTR(struct_type, struct_name, name, elname)    \
 258         F2FS_ATTR_OFFSET(struct_type, name, 0644,               \
 259                 f2fs_sbi_show, f2fs_sbi_store,                  \
 260                 offsetof(struct struct_name, elname))
 261
 262 #define F2FS_GENERAL_RO_ATTR(name) \
 263 static struct f2fs_attr f2fs_attr_##name = __ATTR(name, 0444, name##_show, NULL)
 264
 265 #define F2FS_FEATURE_RO_ATTR(_name, _id)                        \
 266 static struct f2fs_attr f2fs_attr_##_name = {                   \
 267         .attr = {.name = __stringify(_name), .mode = 0444 },    \
 268         .show   = f2fs_feature_show,                            \
 269         .id     = _id,                                          \
 270 }
 271
 272 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_urgent_sleep_time,
 273                                                         urgent_sleep_time);
 274 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_min_sleep_time, min_sleep_time);
 275 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_max_sleep_time, max_sleep_time);
 276 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time);
 277 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_idle, gc_idle);
 278 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_urgent, gc_urgent);
 279 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments);
 280 F2FS_RW_ATTR(DCC_INFO, discard_cmd_control, max_small_discards, max_discards);
 281 F2FS_RW_ATTR(DCC_INFO, discard_cmd_control, discard_granularity, discard_granularity);
 282 F2FS_RW_ATTR(RESERVED_BLOCKS, f2fs_sb_info, reserved_blocks, reserved_blocks);
 283 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, batched_trim_sections, trim_sections);
 284 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy);
 285 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util);
 286 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_fsync_blocks, min_fsync_blocks);
 287 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_hot_blocks, min_hot_blocks);
 288 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ram_thresh, ram_thresh);
 289 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ra_nid_pages, ra_nid_pages);
 290 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, dirty_nats_ratio, dirty_nats_ratio);
 291 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search);
 292 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level);
 293 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, cp_interval, interval_time[CP_TIME]);
 294 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, idle_interval, interval_time[REQ_TIME]);
 295 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, iostat_enable, iostat_enable);
 296 #ifdef CONFIG_F2FS_FAULT_INJECTION
 297 F2FS_RW_ATTR(FAULT_INFO_RATE, f2fs_fault_info, inject_rate, inject_rate);
 298 F2FS_RW_ATTR(FAULT_INFO_TYPE, f2fs_fault_info, inject_type, inject_type);
 299 #endif
 300 F2FS_GENERAL_RO_ATTR(dirty_segments);
 301 F2FS_GENERAL_RO_ATTR(lifetime_write_kbytes);
 302 F2FS_GENERAL_RO_ATTR(features);
 303 F2FS_GENERAL_RO_ATTR(current_reserved_blocks);
 304
 305 #ifdef CONFIG_F2FS_FS_ENCRYPTION
 306 F2FS_FEATURE_RO_ATTR(encryption, FEAT_CRYPTO);
 307 #endif
 308 #ifdef CONFIG_BLK_DEV_ZONED
 309 F2FS_FEATURE_RO_ATTR(block_zoned, FEAT_BLKZONED);
 310 #endif
 311 F2FS_FEATURE_RO_ATTR(atomic_write, FEAT_ATOMIC_WRITE);
 312 F2FS_FEATURE_RO_ATTR(extra_attr, FEAT_EXTRA_ATTR);
 313 F2FS_FEATURE_RO_ATTR(project_quota, FEAT_PROJECT_QUOTA);
 314 F2FS_FEATURE_RO_ATTR(inode_checksum, FEAT_INODE_CHECKSUM);
 315 F2FS_FEATURE_RO_ATTR(flexible_inline_xattr, FEAT_FLEXIBLE_INLINE_XATTR);
 316
 317 #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
 318 static struct attribute *f2fs_attrs[] = {
 319         ATTR_LIST(gc_urgent_sleep_time),
 320         ATTR_LIST(gc_min_sleep_time),
 321         ATTR_LIST(gc_max_sleep_time),
 322         ATTR_LIST(gc_no_gc_sleep_time),
 323         ATTR_LIST(gc_idle),
 324         ATTR_LIST(gc_urgent),
 325         ATTR_LIST(reclaim_segments),
 326         ATTR_LIST(max_small_discards),
 327         ATTR_LIST(discard_granularity),
 328         ATTR_LIST(batched_trim_sections),
 329         ATTR_LIST(ipu_policy),
 330         ATTR_LIST(min_ipu_util),
 331         ATTR_LIST(min_fsync_blocks),
 332         ATTR_LIST(min_hot_blocks),
 333         ATTR_LIST(max_victim_search),
 334         ATTR_LIST(dir_level),
 335         ATTR_LIST(ram_thresh),
 336         ATTR_LIST(ra_nid_pages),
 337         ATTR_LIST(dirty_nats_ratio),
 338         ATTR_LIST(cp_interval),
 339         ATTR_LIST(idle_interval),
 340         ATTR_LIST(iostat_enable),
 341 #ifdef CONFIG_F2FS_FAULT_INJECTION
 342         ATTR_LIST(inject_rate),
 343         ATTR_LIST(inject_type),
 344 #endif
 345         ATTR_LIST(dirty_segments),
 346         ATTR_LIST(lifetime_write_kbytes),
 347         ATTR_LIST(features),
 348         ATTR_LIST(reserved_blocks),
 349         ATTR_LIST(current_reserved_blocks),
 350         NULL,
 351 };
 352
 353 static struct attribute *f2fs_feat_attrs[] = {
 354 #ifdef CONFIG_F2FS_FS_ENCRYPTION
 355         ATTR_LIST(encryption),
 356 #endif
 357 #ifdef CONFIG_BLK_DEV_ZONED
 358         ATTR_LIST(block_zoned),
 359 #endif
 360         ATTR_LIST(atomic_write),
 361         ATTR_LIST(extra_attr),
 362         ATTR_LIST(project_quota),
 363         ATTR_LIST(inode_checksum),
 364         ATTR_LIST(flexible_inline_xattr),
 365         NULL,
 366 };
 367
 368 static const struct sysfs_ops f2fs_attr_ops = {
 369         .show   = f2fs_attr_show,
 370         .store  = f2fs_attr_store,
 371 };
 372
 373 static struct kobj_type f2fs_sb_ktype = {
 374         .default_attrs  = f2fs_attrs,
 375         .sysfs_ops      = &f2fs_attr_ops,
 376         .release        = f2fs_sb_release,
 377 };
 378
 379 static struct kobj_type f2fs_ktype = {
 380         .sysfs_ops      = &f2fs_attr_ops,
 381 };
 382
 383 static struct kset f2fs_kset = {
 384         .kobj   = {.ktype = &f2fs_ktype},
 385 };
 386
 387 static struct kobj_type f2fs_feat_ktype = {
 388         .default_attrs  = f2fs_feat_attrs,
 389         .sysfs_ops      = &f2fs_attr_ops,
 390 };
 391
 392 static struct kobject f2fs_feat = {
 393         .kset   = &f2fs_kset,
 394 };
 395
 396 static int segment_info_seq_show(struct seq_file *seq, void *offset)
 397 {
 398         struct super_block *sb = seq->private;
 399         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 400         unsigned int total_segs =
 401                         le32_to_cpu(sbi->raw_super->segment_count_main);
 402         int i;
 403
 404         seq_puts(seq, "format: segment_type|valid_blocks\n"
 405                 "segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");
 406
 407         for (i = 0; i < total_segs; i++) {
 408                 struct seg_entry *se = get_seg_entry(sbi, i);
 409
 410                 if ((i % 10) == 0)
 411                         seq_printf(seq, "%-10d", i);
 412                 seq_printf(seq, "%d|%-3u", se->type,
 413                                         get_valid_blocks(sbi, i, false));
 414                 if ((i % 10) == 9 || i == (total_segs - 1))
 415                         seq_putc(seq, '\n');
 416                 else
 417                         seq_putc(seq, ' ');
 418         }
 419
 420         return 0;
 421 }
 422
 423 static int segment_bits_seq_show(struct seq_file *seq, void *offset)
 424 {
 425         struct super_block *sb = seq->private;
 426         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 427         unsigned int total_segs =
 428                         le32_to_cpu(sbi->raw_super->segment_count_main);
 429         int i, j;
 430
 431         seq_puts(seq, "format: segment_type|valid_blocks|bitmaps\n"
 432                 "segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");
 433
 434         for (i = 0; i < total_segs; i++) {
 435                 struct seg_entry *se = get_seg_entry(sbi, i);
 436
 437                 seq_printf(seq, "%-10d", i);
 438                 seq_printf(seq, "%d|%-3u|", se->type,
 439                                         get_valid_blocks(sbi, i, false));
 440                 for (j = 0; j < SIT_VBLOCK_MAP_SIZE; j++)
 441                         seq_printf(seq, " %.2x", se->cur_valid_map[j]);
 442                 seq_putc(seq, '\n');
 443         }
 444         return 0;
 445 }
 446
 447 static int iostat_info_seq_show(struct seq_file *seq, void *offset)
 448 {
 449         struct super_block *sb = seq->private;
 450         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 451         time64_t now = ktime_get_real_seconds();
 452
 453         if (!sbi->iostat_enable)
 454                 return 0;
 455
 456         seq_printf(seq, "time:          %-16llu\n", now);
 457
 458         /* print app IOs */
 459         seq_printf(seq, "app buffered:  %-16llu\n",
 460                                 sbi->write_iostat[APP_BUFFERED_IO]);
 461         seq_printf(seq, "app direct:    %-16llu\n",
 462                                 sbi->write_iostat[APP_DIRECT_IO]);
 463         seq_printf(seq, "app mapped:    %-16llu\n",
 464                                 sbi->write_iostat[APP_MAPPED_IO]);
 465
 466         /* print fs IOs */
 467         seq_printf(seq, "fs data:       %-16llu\n",
 468                                 sbi->write_iostat[FS_DATA_IO]);
 469         seq_printf(seq, "fs node:       %-16llu\n",
 470                                 sbi->write_iostat[FS_NODE_IO]);
 471         seq_printf(seq, "fs meta:       %-16llu\n",
 472                                 sbi->write_iostat[FS_META_IO]);
 473         seq_printf(seq, "fs gc data:    %-16llu\n",
 474                                 sbi->write_iostat[FS_GC_DATA_IO]);
 475         seq_printf(seq, "fs gc node:    %-16llu\n",
 476                                 sbi->write_iostat[FS_GC_NODE_IO]);
 477         seq_printf(seq, "fs cp data:    %-16llu\n",
 478                                 sbi->write_iostat[FS_CP_DATA_IO]);
 479         seq_printf(seq, "fs cp node:    %-16llu\n",
 480                                 sbi->write_iostat[FS_CP_NODE_IO]);
 481         seq_printf(seq, "fs cp meta:    %-16llu\n",
 482                                 sbi->write_iostat[FS_CP_META_IO]);
 483         seq_printf(seq, "fs discard:    %-16llu\n",
 484                                 sbi->write_iostat[FS_DISCARD]);
 485
 486         return 0;
 487 }
 488
 489 #define F2FS_PROC_FILE_DEF(_name)                                       \
 490 static int _name##_open_fs(struct inode *inode, struct file *file)      \
 491 {                                                                       \
 492         return single_open(file, _name##_seq_show, PDE_DATA(inode));    \
 493 }                                                                       \
 494                                                                         \
 495 static const struct file_operations f2fs_seq_##_name##_fops = {         \
 496         .open = _name##_open_fs,                                        \
 497         .read = seq_read,                                               \
 498         .llseek = seq_lseek,                                            \
 499         .release = single_release,                                      \
 500 };
 501
 502 F2FS_PROC_FILE_DEF(segment_info);
 503 F2FS_PROC_FILE_DEF(segment_bits);
 504 F2FS_PROC_FILE_DEF(iostat_info);
 505
 506 int __init f2fs_init_sysfs(void)
 507 {
 508         int ret;
 509
 510         kobject_set_name(&f2fs_kset.kobj, "f2fs");
 511         f2fs_kset.kobj.parent = fs_kobj;
 512         ret = kset_register(&f2fs_kset);
 513         if (ret)
 514                 return ret;
 515
 516         ret = kobject_init_and_add(&f2fs_feat, &f2fs_feat_ktype,
 517                                    NULL, "features");
 518         if (ret)
 519                 kset_unregister(&f2fs_kset);
 520         else
 521                 f2fs_proc_root = proc_mkdir("fs/f2fs", NULL);
 522         return ret;
 523 }
 524
 525 void f2fs_exit_sysfs(void)
 526 {
 527         kobject_put(&f2fs_feat);
 528         kset_unregister(&f2fs_kset);
 529         remove_proc_entry("fs/f2fs", NULL);
 530         f2fs_proc_root = NULL;
 531 }
 532
 533 int f2fs_register_sysfs(struct f2fs_sb_info *sbi)
 534 {
 535         struct super_block *sb = sbi->sb;
 536         int err;
 537
 538         sbi->s_kobj.kset = &f2fs_kset;
 539         init_completion(&sbi->s_kobj_unregister);
 540         err = kobject_init_and_add(&sbi->s_kobj, &f2fs_sb_ktype, NULL,
 541                                 "%s", sb->s_id);
 542         if (err)
 543                 return err;
 544
 545         if (f2fs_proc_root)
 546                 sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);
 547
 548         if (sbi->s_proc) {
 549                 proc_create_data("segment_info", S_IRUGO, sbi->s_proc,
 550                                  &f2fs_seq_segment_info_fops, sb);
 551                 proc_create_data("segment_bits", S_IRUGO, sbi->s_proc,
 552                                  &f2fs_seq_segment_bits_fops, sb);
 553                 proc_create_data("iostat_info", S_IRUGO, sbi->s_proc,
 554                                 &f2fs_seq_iostat_info_fops, sb);
 555         }
 556         return 0;
 557 }
 558
 559 void f2fs_unregister_sysfs(struct f2fs_sb_info *sbi)
 560 {
 561         if (sbi->s_proc) {
 562                 remove_proc_entry("iostat_info", sbi->s_proc);
 563                 remove_proc_entry("segment_info", sbi->s_proc);
 564                 remove_proc_entry("segment_bits", sbi->s_proc);
 565                 remove_proc_entry(sbi->sb->s_id, f2fs_proc_root);
 566         }
 567         kobject_del(&sbi->s_kobj);
 568 }