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         if (f2fs_sb_has_inode_crtime(sb))
 117                 len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
 118                                 len ? ", " : "", "inode_crtime");
 119         len += snprintf(buf + len, PAGE_SIZE - len, "\n");
 120         return len;
 121 }
 122
 123 static ssize_t current_reserved_blocks_show(struct f2fs_attr *a,
 124                                         struct f2fs_sb_info *sbi, char *buf)
 125 {
 126         return snprintf(buf, PAGE_SIZE, "%u\n", sbi->current_reserved_blocks);
 127 }
 128
 129 static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
 130                         struct f2fs_sb_info *sbi, char *buf)
 131 {
 132         unsigned char *ptr = NULL;
 133         unsigned int *ui;
 134
 135         ptr = __struct_ptr(sbi, a->struct_type);
 136         if (!ptr)
 137                 return -EINVAL;
 138
 139         ui = (unsigned int *)(ptr + a->offset);
 140
 141         return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
 142 }
 143
 144 static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
 145                         struct f2fs_sb_info *sbi,
 146                         const char *buf, size_t count)
 147 {
 148         unsigned char *ptr;
 149         unsigned long t;
 150         unsigned int *ui;
 151         ssize_t ret;
 152
 153         ptr = __struct_ptr(sbi, a->struct_type);
 154         if (!ptr)
 155                 return -EINVAL;
 156
 157         ui = (unsigned int *)(ptr + a->offset);
 158
 159         ret = kstrtoul(skip_spaces(buf), 0, &t);
 160         if (ret < 0)
 161                 return ret;
 162 #ifdef CONFIG_F2FS_FAULT_INJECTION
 163         if (a->struct_type == FAULT_INFO_TYPE && t >= (1 << FAULT_MAX))
 164                 return -EINVAL;
 165 #endif
 166         if (a->struct_type == RESERVED_BLOCKS) {
 167                 spin_lock(&sbi->stat_lock);
 168                 if (t > (unsigned long)(sbi->user_block_count -
 169                                         sbi->root_reserved_blocks)) {
 170                         spin_unlock(&sbi->stat_lock);
 171                         return -EINVAL;
 172                 }
 173                 *ui = t;
 174                 sbi->current_reserved_blocks = min(sbi->reserved_blocks,
 175                                 sbi->user_block_count - valid_user_blocks(sbi));
 176                 spin_unlock(&sbi->stat_lock);
 177                 return count;
 178         }
 179
 180         if (!strcmp(a->attr.name, "discard_granularity")) {
 181                 if (t == 0 || t > MAX_PLIST_NUM)
 182                         return -EINVAL;
 183                 if (t == *ui)
 184                         return count;
 185                 *ui = t;
 186                 return count;
 187         }
 188
 189         *ui = t;
 190
 191         if (!strcmp(a->attr.name, "iostat_enable") && *ui == 0)
 192                 f2fs_reset_iostat(sbi);
 193         if (!strcmp(a->attr.name, "gc_urgent") && t == 1 && sbi->gc_thread) {
 194                 sbi->gc_thread->gc_wake = 1;
 195                 wake_up_interruptible_all(&sbi->gc_thread->gc_wait_queue_head);
 196                 wake_up_discard_thread(sbi, true);
 197         }
 198
 199         return count;
 200 }
 201
 202 static ssize_t f2fs_attr_show(struct kobject *kobj,
 203                                 struct attribute *attr, char *buf)
 204 {
 205         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
 206                                                                 s_kobj);
 207         struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
 208
 209         return a->show ? a->show(a, sbi, buf) : 0;
 210 }
 211
 212 static ssize_t f2fs_attr_store(struct kobject *kobj, struct attribute *attr,
 213                                                 const char *buf, size_t len)
 214 {
 215         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
 216                                                                         s_kobj);
 217         struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
 218
 219         return a->store ? a->store(a, sbi, buf, len) : 0;
 220 }
 221
 222 static void f2fs_sb_release(struct kobject *kobj)
 223 {
 224         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
 225                                                                 s_kobj);
 226         complete(&sbi->s_kobj_unregister);
 227 }
 228
 229 enum feat_id {
 230         FEAT_CRYPTO = 0,
 231         FEAT_BLKZONED,
 232         FEAT_ATOMIC_WRITE,
 233         FEAT_EXTRA_ATTR,
 234         FEAT_PROJECT_QUOTA,
 235         FEAT_INODE_CHECKSUM,
 236         FEAT_FLEXIBLE_INLINE_XATTR,
 237         FEAT_QUOTA_INO,
 238         FEAT_INODE_CRTIME,
 239 };
 240
 241 static ssize_t f2fs_feature_show(struct f2fs_attr *a,
 242                 struct f2fs_sb_info *sbi, char *buf)
 243 {
 244         switch (a->id) {
 245         case FEAT_CRYPTO:
 246         case FEAT_BLKZONED:
 247         case FEAT_ATOMIC_WRITE:
 248         case FEAT_EXTRA_ATTR:
 249         case FEAT_PROJECT_QUOTA:
 250         case FEAT_INODE_CHECKSUM:
 251         case FEAT_FLEXIBLE_INLINE_XATTR:
 252         case FEAT_QUOTA_INO:
 253         case FEAT_INODE_CRTIME:
 254                 return snprintf(buf, PAGE_SIZE, "supported\n");
 255         }
 256         return 0;
 257 }
 258
 259 #define F2FS_ATTR_OFFSET(_struct_type, _name, _mode, _show, _store, _offset) \
 260 static struct f2fs_attr f2fs_attr_##_name = {                   \
 261         .attr = {.name = __stringify(_name), .mode = _mode },   \
 262         .show   = _show,                                        \
 263         .store  = _store,                                       \
 264         .struct_type = _struct_type,                            \
 265         .offset = _offset                                       \
 266 }
 267
 268 #define F2FS_RW_ATTR(struct_type, struct_name, name, elname)    \
 269         F2FS_ATTR_OFFSET(struct_type, name, 0644,               \
 270                 f2fs_sbi_show, f2fs_sbi_store,                  \
 271                 offsetof(struct struct_name, elname))
 272
 273 #define F2FS_GENERAL_RO_ATTR(name) \
 274 static struct f2fs_attr f2fs_attr_##name = __ATTR(name, 0444, name##_show, NULL)
 275
 276 #define F2FS_FEATURE_RO_ATTR(_name, _id)                        \
 277 static struct f2fs_attr f2fs_attr_##_name = {                   \
 278         .attr = {.name = __stringify(_name), .mode = 0444 },    \
 279         .show   = f2fs_feature_show,                            \
 280         .id     = _id,                                          \
 281 }
 282
 283 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_urgent_sleep_time,
 284                                                         urgent_sleep_time);
 285 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_min_sleep_time, min_sleep_time);
 286 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_max_sleep_time, max_sleep_time);
 287 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time);
 288 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_idle, gc_idle);
 289 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_urgent, gc_urgent);
 290 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments);
 291 F2FS_RW_ATTR(DCC_INFO, discard_cmd_control, max_small_discards, max_discards);
 292 F2FS_RW_ATTR(DCC_INFO, discard_cmd_control, discard_granularity, discard_granularity);
 293 F2FS_RW_ATTR(RESERVED_BLOCKS, f2fs_sb_info, reserved_blocks, reserved_blocks);
 294 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, batched_trim_sections, trim_sections);
 295 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy);
 296 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util);
 297 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_fsync_blocks, min_fsync_blocks);
 298 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_hot_blocks, min_hot_blocks);
 299 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ssr_sections, min_ssr_sections);
 300 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ram_thresh, ram_thresh);
 301 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ra_nid_pages, ra_nid_pages);
 302 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, dirty_nats_ratio, dirty_nats_ratio);
 303 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search);
 304 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level);
 305 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, cp_interval, interval_time[CP_TIME]);
 306 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, idle_interval, interval_time[REQ_TIME]);
 307 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, iostat_enable, iostat_enable);
 308 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, readdir_ra, readdir_ra);
 309 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, gc_pin_file_thresh, gc_pin_file_threshold);
 310 #ifdef CONFIG_F2FS_FAULT_INJECTION
 311 F2FS_RW_ATTR(FAULT_INFO_RATE, f2fs_fault_info, inject_rate, inject_rate);
 312 F2FS_RW_ATTR(FAULT_INFO_TYPE, f2fs_fault_info, inject_type, inject_type);
 313 #endif
 314 F2FS_GENERAL_RO_ATTR(dirty_segments);
 315 F2FS_GENERAL_RO_ATTR(lifetime_write_kbytes);
 316 F2FS_GENERAL_RO_ATTR(features);
 317 F2FS_GENERAL_RO_ATTR(current_reserved_blocks);
 318
 319 #ifdef CONFIG_F2FS_FS_ENCRYPTION
 320 F2FS_FEATURE_RO_ATTR(encryption, FEAT_CRYPTO);
 321 #endif
 322 #ifdef CONFIG_BLK_DEV_ZONED
 323 F2FS_FEATURE_RO_ATTR(block_zoned, FEAT_BLKZONED);
 324 #endif
 325 F2FS_FEATURE_RO_ATTR(atomic_write, FEAT_ATOMIC_WRITE);
 326 F2FS_FEATURE_RO_ATTR(extra_attr, FEAT_EXTRA_ATTR);
 327 F2FS_FEATURE_RO_ATTR(project_quota, FEAT_PROJECT_QUOTA);
 328 F2FS_FEATURE_RO_ATTR(inode_checksum, FEAT_INODE_CHECKSUM);
 329 F2FS_FEATURE_RO_ATTR(flexible_inline_xattr, FEAT_FLEXIBLE_INLINE_XATTR);
 330 F2FS_FEATURE_RO_ATTR(quota_ino, FEAT_QUOTA_INO);
 331 F2FS_FEATURE_RO_ATTR(inode_crtime, FEAT_INODE_CRTIME);
 332
 333 #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
 334 static struct attribute *f2fs_attrs[] = {
 335         ATTR_LIST(gc_urgent_sleep_time),
 336         ATTR_LIST(gc_min_sleep_time),
 337         ATTR_LIST(gc_max_sleep_time),
 338         ATTR_LIST(gc_no_gc_sleep_time),
 339         ATTR_LIST(gc_idle),
 340         ATTR_LIST(gc_urgent),
 341         ATTR_LIST(reclaim_segments),
 342         ATTR_LIST(max_small_discards),
 343         ATTR_LIST(discard_granularity),
 344         ATTR_LIST(batched_trim_sections),
 345         ATTR_LIST(ipu_policy),
 346         ATTR_LIST(min_ipu_util),
 347         ATTR_LIST(min_fsync_blocks),
 348         ATTR_LIST(min_hot_blocks),
 349         ATTR_LIST(min_ssr_sections),
 350         ATTR_LIST(max_victim_search),
 351         ATTR_LIST(dir_level),
 352         ATTR_LIST(ram_thresh),
 353         ATTR_LIST(ra_nid_pages),
 354         ATTR_LIST(dirty_nats_ratio),
 355         ATTR_LIST(cp_interval),
 356         ATTR_LIST(idle_interval),
 357         ATTR_LIST(iostat_enable),
 358         ATTR_LIST(readdir_ra),
 359         ATTR_LIST(gc_pin_file_thresh),
 360 #ifdef CONFIG_F2FS_FAULT_INJECTION
 361         ATTR_LIST(inject_rate),
 362         ATTR_LIST(inject_type),
 363 #endif
 364         ATTR_LIST(dirty_segments),
 365         ATTR_LIST(lifetime_write_kbytes),
 366         ATTR_LIST(features),
 367         ATTR_LIST(reserved_blocks),
 368         ATTR_LIST(current_reserved_blocks),
 369         NULL,
 370 };
 371
 372 static struct attribute *f2fs_feat_attrs[] = {
 373 #ifdef CONFIG_F2FS_FS_ENCRYPTION
 374         ATTR_LIST(encryption),
 375 #endif
 376 #ifdef CONFIG_BLK_DEV_ZONED
 377         ATTR_LIST(block_zoned),
 378 #endif
 379         ATTR_LIST(atomic_write),
 380         ATTR_LIST(extra_attr),
 381         ATTR_LIST(project_quota),
 382         ATTR_LIST(inode_checksum),
 383         ATTR_LIST(flexible_inline_xattr),
 384         ATTR_LIST(quota_ino),
 385         ATTR_LIST(inode_crtime),
 386         NULL,
 387 };
 388
 389 static const struct sysfs_ops f2fs_attr_ops = {
 390         .show   = f2fs_attr_show,
 391         .store  = f2fs_attr_store,
 392 };
 393
 394 static struct kobj_type f2fs_sb_ktype = {
 395         .default_attrs  = f2fs_attrs,
 396         .sysfs_ops      = &f2fs_attr_ops,
 397         .release        = f2fs_sb_release,
 398 };
 399
 400 static struct kobj_type f2fs_ktype = {
 401         .sysfs_ops      = &f2fs_attr_ops,
 402 };
 403
 404 static struct kset f2fs_kset = {
 405         .kobj   = {.ktype = &f2fs_ktype},
 406 };
 407
 408 static struct kobj_type f2fs_feat_ktype = {
 409         .default_attrs  = f2fs_feat_attrs,
 410         .sysfs_ops      = &f2fs_attr_ops,
 411 };
 412
 413 static struct kobject f2fs_feat = {
 414         .kset   = &f2fs_kset,
 415 };
 416
 417 static int segment_info_seq_show(struct seq_file *seq, void *offset)
 418 {
 419         struct super_block *sb = seq->private;
 420         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 421         unsigned int total_segs =
 422                         le32_to_cpu(sbi->raw_super->segment_count_main);
 423         int i;
 424
 425         seq_puts(seq, "format: segment_type|valid_blocks\n"
 426                 "segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");
 427
 428         for (i = 0; i < total_segs; i++) {
 429                 struct seg_entry *se = get_seg_entry(sbi, i);
 430
 431                 if ((i % 10) == 0)
 432                         seq_printf(seq, "%-10d", i);
 433                 seq_printf(seq, "%d|%-3u", se->type,
 434                                         get_valid_blocks(sbi, i, false));
 435                 if ((i % 10) == 9 || i == (total_segs - 1))
 436                         seq_putc(seq, '\n');
 437                 else
 438                         seq_putc(seq, ' ');
 439         }
 440
 441         return 0;
 442 }
 443
 444 static int segment_bits_seq_show(struct seq_file *seq, void *offset)
 445 {
 446         struct super_block *sb = seq->private;
 447         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 448         unsigned int total_segs =
 449                         le32_to_cpu(sbi->raw_super->segment_count_main);
 450         int i, j;
 451
 452         seq_puts(seq, "format: segment_type|valid_blocks|bitmaps\n"
 453                 "segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");
 454
 455         for (i = 0; i < total_segs; i++) {
 456                 struct seg_entry *se = get_seg_entry(sbi, i);
 457
 458                 seq_printf(seq, "%-10d", i);
 459                 seq_printf(seq, "%d|%-3u|", se->type,
 460                                         get_valid_blocks(sbi, i, false));
 461                 for (j = 0; j < SIT_VBLOCK_MAP_SIZE; j++)
 462                         seq_printf(seq, " %.2x", se->cur_valid_map[j]);
 463                 seq_putc(seq, '\n');
 464         }
 465         return 0;
 466 }
 467
 468 static int iostat_info_seq_show(struct seq_file *seq, void *offset)
 469 {
 470         struct super_block *sb = seq->private;
 471         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 472         time64_t now = ktime_get_real_seconds();
 473
 474         if (!sbi->iostat_enable)
 475                 return 0;
 476
 477         seq_printf(seq, "time:          %-16llu\n", now);
 478
 479         /* print app IOs */
 480         seq_printf(seq, "app buffered:  %-16llu\n",
 481                                 sbi->write_iostat[APP_BUFFERED_IO]);
 482         seq_printf(seq, "app direct:    %-16llu\n",
 483                                 sbi->write_iostat[APP_DIRECT_IO]);
 484         seq_printf(seq, "app mapped:    %-16llu\n",
 485                                 sbi->write_iostat[APP_MAPPED_IO]);
 486
 487         /* print fs IOs */
 488         seq_printf(seq, "fs data:       %-16llu\n",
 489                                 sbi->write_iostat[FS_DATA_IO]);
 490         seq_printf(seq, "fs node:       %-16llu\n",
 491                                 sbi->write_iostat[FS_NODE_IO]);
 492         seq_printf(seq, "fs meta:       %-16llu\n",
 493                                 sbi->write_iostat[FS_META_IO]);
 494         seq_printf(seq, "fs gc data:    %-16llu\n",
 495                                 sbi->write_iostat[FS_GC_DATA_IO]);
 496         seq_printf(seq, "fs gc node:    %-16llu\n",
 497                                 sbi->write_iostat[FS_GC_NODE_IO]);
 498         seq_printf(seq, "fs cp data:    %-16llu\n",
 499                                 sbi->write_iostat[FS_CP_DATA_IO]);
 500         seq_printf(seq, "fs cp node:    %-16llu\n",
 501                                 sbi->write_iostat[FS_CP_NODE_IO]);
 502         seq_printf(seq, "fs cp meta:    %-16llu\n",
 503                                 sbi->write_iostat[FS_CP_META_IO]);
 504         seq_printf(seq, "fs discard:    %-16llu\n",
 505                                 sbi->write_iostat[FS_DISCARD]);
 506
 507         return 0;
 508 }
 509
 510 #define F2FS_PROC_FILE_DEF(_name)                                       \
 511 static int _name##_open_fs(struct inode *inode, struct file *file)      \
 512 {                                                                       \
 513         return single_open(file, _name##_seq_show, PDE_DATA(inode));    \
 514 }                                                                       \
 515                                                                         \
 516 static const struct file_operations f2fs_seq_##_name##_fops = {         \
 517         .open = _name##_open_fs,                                        \
 518         .read = seq_read,                                               \
 519         .llseek = seq_lseek,                                            \
 520         .release = single_release,                                      \
 521 };
 522
 523 F2FS_PROC_FILE_DEF(segment_info);
 524 F2FS_PROC_FILE_DEF(segment_bits);
 525 F2FS_PROC_FILE_DEF(iostat_info);
 526
 527 int __init f2fs_init_sysfs(void)
 528 {
 529         int ret;
 530
 531         kobject_set_name(&f2fs_kset.kobj, "f2fs");
 532         f2fs_kset.kobj.parent = fs_kobj;
 533         ret = kset_register(&f2fs_kset);
 534         if (ret)
 535                 return ret;
 536
 537         ret = kobject_init_and_add(&f2fs_feat, &f2fs_feat_ktype,
 538                                    NULL, "features");
 539         if (ret)
 540                 kset_unregister(&f2fs_kset);
 541         else
 542                 f2fs_proc_root = proc_mkdir("fs/f2fs", NULL);
 543         return ret;
 544 }
 545
 546 void f2fs_exit_sysfs(void)
 547 {
 548         kobject_put(&f2fs_feat);
 549         kset_unregister(&f2fs_kset);
 550         remove_proc_entry("fs/f2fs", NULL);
 551         f2fs_proc_root = NULL;
 552 }
 553
 554 int f2fs_register_sysfs(struct f2fs_sb_info *sbi)
 555 {
 556         struct super_block *sb = sbi->sb;
 557         int err;
 558
 559         sbi->s_kobj.kset = &f2fs_kset;
 560         init_completion(&sbi->s_kobj_unregister);
 561         err = kobject_init_and_add(&sbi->s_kobj, &f2fs_sb_ktype, NULL,
 562                                 "%s", sb->s_id);
 563         if (err)
 564                 return err;
 565
 566         if (f2fs_proc_root)
 567                 sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);
 568
 569         if (sbi->s_proc) {
 570                 proc_create_data("segment_info", S_IRUGO, sbi->s_proc,
 571                                  &f2fs_seq_segment_info_fops, sb);
 572                 proc_create_data("segment_bits", S_IRUGO, sbi->s_proc,
 573                                  &f2fs_seq_segment_bits_fops, sb);
 574                 proc_create_data("iostat_info", S_IRUGO, sbi->s_proc,
 575                                 &f2fs_seq_iostat_info_fops, sb);
 576         }
 577         return 0;
 578 }
 579
 580 void f2fs_unregister_sysfs(struct f2fs_sb_info *sbi)
 581 {
 582         if (sbi->s_proc) {
 583                 remove_proc_entry("iostat_info", sbi->s_proc);
 584                 remove_proc_entry("segment_info", sbi->s_proc);
 585                 remove_proc_entry("segment_bits", sbi->s_proc);
 586                 remove_proc_entry(sbi->sb->s_id, f2fs_proc_root);
 587         }
 588         kobject_del(&sbi->s_kobj);
 589 }