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 #ifdef CONFIG_F2FS_FAULT_INJECTION
 305 F2FS_RW_ATTR(FAULT_INFO_RATE, f2fs_fault_info, inject_rate, inject_rate);
 306 F2FS_RW_ATTR(FAULT_INFO_TYPE, f2fs_fault_info, inject_type, inject_type);
 307 #endif
 308 F2FS_GENERAL_RO_ATTR(dirty_segments);
 309 F2FS_GENERAL_RO_ATTR(lifetime_write_kbytes);
 310 F2FS_GENERAL_RO_ATTR(features);
 311 F2FS_GENERAL_RO_ATTR(current_reserved_blocks);
 312
 313 #ifdef CONFIG_F2FS_FS_ENCRYPTION
 314 F2FS_FEATURE_RO_ATTR(encryption, FEAT_CRYPTO);
 315 #endif
 316 #ifdef CONFIG_BLK_DEV_ZONED
 317 F2FS_FEATURE_RO_ATTR(block_zoned, FEAT_BLKZONED);
 318 #endif
 319 F2FS_FEATURE_RO_ATTR(atomic_write, FEAT_ATOMIC_WRITE);
 320 F2FS_FEATURE_RO_ATTR(extra_attr, FEAT_EXTRA_ATTR);
 321 F2FS_FEATURE_RO_ATTR(project_quota, FEAT_PROJECT_QUOTA);
 322 F2FS_FEATURE_RO_ATTR(inode_checksum, FEAT_INODE_CHECKSUM);
 323 F2FS_FEATURE_RO_ATTR(flexible_inline_xattr, FEAT_FLEXIBLE_INLINE_XATTR);
 324 F2FS_FEATURE_RO_ATTR(quota_ino, FEAT_QUOTA_INO);
 325
 326 #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
 327 static struct attribute *f2fs_attrs[] = {
 328         ATTR_LIST(gc_urgent_sleep_time),
 329         ATTR_LIST(gc_min_sleep_time),
 330         ATTR_LIST(gc_max_sleep_time),
 331         ATTR_LIST(gc_no_gc_sleep_time),
 332         ATTR_LIST(gc_idle),
 333         ATTR_LIST(gc_urgent),
 334         ATTR_LIST(reclaim_segments),
 335         ATTR_LIST(max_small_discards),
 336         ATTR_LIST(discard_granularity),
 337         ATTR_LIST(batched_trim_sections),
 338         ATTR_LIST(ipu_policy),
 339         ATTR_LIST(min_ipu_util),
 340         ATTR_LIST(min_fsync_blocks),
 341         ATTR_LIST(min_hot_blocks),
 342         ATTR_LIST(min_ssr_sections),
 343         ATTR_LIST(max_victim_search),
 344         ATTR_LIST(dir_level),
 345         ATTR_LIST(ram_thresh),
 346         ATTR_LIST(ra_nid_pages),
 347         ATTR_LIST(dirty_nats_ratio),
 348         ATTR_LIST(cp_interval),
 349         ATTR_LIST(idle_interval),
 350         ATTR_LIST(iostat_enable),
 351         ATTR_LIST(readdir_ra),
 352 #ifdef CONFIG_F2FS_FAULT_INJECTION
 353         ATTR_LIST(inject_rate),
 354         ATTR_LIST(inject_type),
 355 #endif
 356         ATTR_LIST(dirty_segments),
 357         ATTR_LIST(lifetime_write_kbytes),
 358         ATTR_LIST(features),
 359         ATTR_LIST(reserved_blocks),
 360         ATTR_LIST(current_reserved_blocks),
 361         NULL,
 362 };
 363
 364 static struct attribute *f2fs_feat_attrs[] = {
 365 #ifdef CONFIG_F2FS_FS_ENCRYPTION
 366         ATTR_LIST(encryption),
 367 #endif
 368 #ifdef CONFIG_BLK_DEV_ZONED
 369         ATTR_LIST(block_zoned),
 370 #endif
 371         ATTR_LIST(atomic_write),
 372         ATTR_LIST(extra_attr),
 373         ATTR_LIST(project_quota),
 374         ATTR_LIST(inode_checksum),
 375         ATTR_LIST(flexible_inline_xattr),
 376         ATTR_LIST(quota_ino),
 377         NULL,
 378 };
 379
 380 static const struct sysfs_ops f2fs_attr_ops = {
 381         .show   = f2fs_attr_show,
 382         .store  = f2fs_attr_store,
 383 };
 384
 385 static struct kobj_type f2fs_sb_ktype = {
 386         .default_attrs  = f2fs_attrs,
 387         .sysfs_ops      = &f2fs_attr_ops,
 388         .release        = f2fs_sb_release,
 389 };
 390
 391 static struct kobj_type f2fs_ktype = {
 392         .sysfs_ops      = &f2fs_attr_ops,
 393 };
 394
 395 static struct kset f2fs_kset = {
 396         .kobj   = {.ktype = &f2fs_ktype},
 397 };
 398
 399 static struct kobj_type f2fs_feat_ktype = {
 400         .default_attrs  = f2fs_feat_attrs,
 401         .sysfs_ops      = &f2fs_attr_ops,
 402 };
 403
 404 static struct kobject f2fs_feat = {
 405         .kset   = &f2fs_kset,
 406 };
 407
 408 static int segment_info_seq_show(struct seq_file *seq, void *offset)
 409 {
 410         struct super_block *sb = seq->private;
 411         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 412         unsigned int total_segs =
 413                         le32_to_cpu(sbi->raw_super->segment_count_main);
 414         int i;
 415
 416         seq_puts(seq, "format: segment_type|valid_blocks\n"
 417                 "segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");
 418
 419         for (i = 0; i < total_segs; i++) {
 420                 struct seg_entry *se = get_seg_entry(sbi, i);
 421
 422                 if ((i % 10) == 0)
 423                         seq_printf(seq, "%-10d", i);
 424                 seq_printf(seq, "%d|%-3u", se->type,
 425                                         get_valid_blocks(sbi, i, false));
 426                 if ((i % 10) == 9 || i == (total_segs - 1))
 427                         seq_putc(seq, '\n');
 428                 else
 429                         seq_putc(seq, ' ');
 430         }
 431
 432         return 0;
 433 }
 434
 435 static int segment_bits_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         unsigned int total_segs =
 440                         le32_to_cpu(sbi->raw_super->segment_count_main);
 441         int i, j;
 442
 443         seq_puts(seq, "format: segment_type|valid_blocks|bitmaps\n"
 444                 "segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");
 445
 446         for (i = 0; i < total_segs; i++) {
 447                 struct seg_entry *se = get_seg_entry(sbi, i);
 448
 449                 seq_printf(seq, "%-10d", i);
 450                 seq_printf(seq, "%d|%-3u|", se->type,
 451                                         get_valid_blocks(sbi, i, false));
 452                 for (j = 0; j < SIT_VBLOCK_MAP_SIZE; j++)
 453                         seq_printf(seq, " %.2x", se->cur_valid_map[j]);
 454                 seq_putc(seq, '\n');
 455         }
 456         return 0;
 457 }
 458
 459 static int iostat_info_seq_show(struct seq_file *seq, void *offset)
 460 {
 461         struct super_block *sb = seq->private;
 462         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 463         time64_t now = ktime_get_real_seconds();
 464
 465         if (!sbi->iostat_enable)
 466                 return 0;
 467
 468         seq_printf(seq, "time:          %-16llu\n", now);
 469
 470         /* print app IOs */
 471         seq_printf(seq, "app buffered:  %-16llu\n",
 472                                 sbi->write_iostat[APP_BUFFERED_IO]);
 473         seq_printf(seq, "app direct:    %-16llu\n",
 474                                 sbi->write_iostat[APP_DIRECT_IO]);
 475         seq_printf(seq, "app mapped:    %-16llu\n",
 476                                 sbi->write_iostat[APP_MAPPED_IO]);
 477
 478         /* print fs IOs */
 479         seq_printf(seq, "fs data:       %-16llu\n",
 480                                 sbi->write_iostat[FS_DATA_IO]);
 481         seq_printf(seq, "fs node:       %-16llu\n",
 482                                 sbi->write_iostat[FS_NODE_IO]);
 483         seq_printf(seq, "fs meta:       %-16llu\n",
 484                                 sbi->write_iostat[FS_META_IO]);
 485         seq_printf(seq, "fs gc data:    %-16llu\n",
 486                                 sbi->write_iostat[FS_GC_DATA_IO]);
 487         seq_printf(seq, "fs gc node:    %-16llu\n",
 488                                 sbi->write_iostat[FS_GC_NODE_IO]);
 489         seq_printf(seq, "fs cp data:    %-16llu\n",
 490                                 sbi->write_iostat[FS_CP_DATA_IO]);
 491         seq_printf(seq, "fs cp node:    %-16llu\n",
 492                                 sbi->write_iostat[FS_CP_NODE_IO]);
 493         seq_printf(seq, "fs cp meta:    %-16llu\n",
 494                                 sbi->write_iostat[FS_CP_META_IO]);
 495         seq_printf(seq, "fs discard:    %-16llu\n",
 496                                 sbi->write_iostat[FS_DISCARD]);
 497
 498         return 0;
 499 }
 500
 501 #define F2FS_PROC_FILE_DEF(_name)                                       \
 502 static int _name##_open_fs(struct inode *inode, struct file *file)      \
 503 {                                                                       \
 504         return single_open(file, _name##_seq_show, PDE_DATA(inode));    \
 505 }                                                                       \
 506                                                                         \
 507 static const struct file_operations f2fs_seq_##_name##_fops = {         \
 508         .open = _name##_open_fs,                                        \
 509         .read = seq_read,                                               \
 510         .llseek = seq_lseek,                                            \
 511         .release = single_release,                                      \
 512 };
 513
 514 F2FS_PROC_FILE_DEF(segment_info);
 515 F2FS_PROC_FILE_DEF(segment_bits);
 516 F2FS_PROC_FILE_DEF(iostat_info);
 517
 518 int __init f2fs_init_sysfs(void)
 519 {
 520         int ret;
 521
 522         kobject_set_name(&f2fs_kset.kobj, "f2fs");
 523         f2fs_kset.kobj.parent = fs_kobj;
 524         ret = kset_register(&f2fs_kset);
 525         if (ret)
 526                 return ret;
 527
 528         ret = kobject_init_and_add(&f2fs_feat, &f2fs_feat_ktype,
 529                                    NULL, "features");
 530         if (ret)
 531                 kset_unregister(&f2fs_kset);
 532         else
 533                 f2fs_proc_root = proc_mkdir("fs/f2fs", NULL);
 534         return ret;
 535 }
 536
 537 void f2fs_exit_sysfs(void)
 538 {
 539         kobject_put(&f2fs_feat);
 540         kset_unregister(&f2fs_kset);
 541         remove_proc_entry("fs/f2fs", NULL);
 542         f2fs_proc_root = NULL;
 543 }
 544
 545 int f2fs_register_sysfs(struct f2fs_sb_info *sbi)
 546 {
 547         struct super_block *sb = sbi->sb;
 548         int err;
 549
 550         sbi->s_kobj.kset = &f2fs_kset;
 551         init_completion(&sbi->s_kobj_unregister);
 552         err = kobject_init_and_add(&sbi->s_kobj, &f2fs_sb_ktype, NULL,
 553                                 "%s", sb->s_id);
 554         if (err)
 555                 return err;
 556
 557         if (f2fs_proc_root)
 558                 sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);
 559
 560         if (sbi->s_proc) {
 561                 proc_create_data("segment_info", S_IRUGO, sbi->s_proc,
 562                                  &f2fs_seq_segment_info_fops, sb);
 563                 proc_create_data("segment_bits", S_IRUGO, sbi->s_proc,
 564                                  &f2fs_seq_segment_bits_fops, sb);
 565                 proc_create_data("iostat_info", S_IRUGO, sbi->s_proc,
 566                                 &f2fs_seq_iostat_info_fops, sb);
 567         }
 568         return 0;
 569 }
 570
 571 void f2fs_unregister_sysfs(struct f2fs_sb_info *sbi)
 572 {
 573         if (sbi->s_proc) {
 574                 remove_proc_entry("iostat_info", sbi->s_proc);
 575                 remove_proc_entry("segment_info", sbi->s_proc);
 576                 remove_proc_entry("segment_bits", sbi->s_proc);
 577                 remove_proc_entry(sbi->sb->s_id, f2fs_proc_root);
 578         }
 579         kobject_del(&sbi->s_kobj);
 580 }