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