fs/f2fs/sysfs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * f2fs sysfs interface
   4  *
   5  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   6  *             http://www.samsung.com/
   7  * Copyright (c) 2017 Chao Yu <[email protected]>
   8  */
   9 #include <linux/compiler.h>
  10 #include <linux/proc_fs.h>
  11 #include <linux/f2fs_fs.h>
  12 #include <linux/seq_file.h>
  13 #include <linux/unicode.h>
  14 #include <linux/ioprio.h>
  15 #include <linux/sysfs.h>
  16
  17 #include "f2fs.h"
  18 #include "segment.h"
  19 #include "gc.h"
  20 #include "iostat.h"
  21 #include <trace/events/f2fs.h>
  22
  23 static struct proc_dir_entry *f2fs_proc_root;
  24
  25 /* Sysfs support for f2fs */
  26 enum {
  27         GC_THREAD,      /* struct f2fs_gc_thread */
  28         SM_INFO,        /* struct f2fs_sm_info */
  29         DCC_INFO,       /* struct discard_cmd_control */
  30         NM_INFO,        /* struct f2fs_nm_info */
  31         F2FS_SBI,       /* struct f2fs_sb_info */
  32 #ifdef CONFIG_F2FS_STAT_FS
  33         STAT_INFO,      /* struct f2fs_stat_info */
  34 #endif
  35 #ifdef CONFIG_F2FS_FAULT_INJECTION
  36         FAULT_INFO_RATE,        /* struct f2fs_fault_info */
  37         FAULT_INFO_TYPE,        /* struct f2fs_fault_info */
  38 #endif
  39         RESERVED_BLOCKS,        /* struct f2fs_sb_info */
  40         CPRC_INFO,      /* struct ckpt_req_control */
  41         ATGC_INFO,      /* struct atgc_management */
  42 };
  43
  44 struct f2fs_attr {
  45         struct attribute attr;
  46         ssize_t (*show)(struct f2fs_attr *, struct f2fs_sb_info *, char *);
  47         ssize_t (*store)(struct f2fs_attr *, struct f2fs_sb_info *,
  48                          const char *, size_t);
  49         int struct_type;
  50         int offset;
  51         int id;
  52 };
  53
  54 static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
  55                              struct f2fs_sb_info *sbi, char *buf);
  56
  57 static unsigned char *__struct_ptr(struct f2fs_sb_info *sbi, int struct_type)
  58 {
  59         if (struct_type == GC_THREAD)
  60                 return (unsigned char *)sbi->gc_thread;
  61         else if (struct_type == SM_INFO)
  62                 return (unsigned char *)SM_I(sbi);
  63         else if (struct_type == DCC_INFO)
  64                 return (unsigned char *)SM_I(sbi)->dcc_info;
  65         else if (struct_type == NM_INFO)
  66                 return (unsigned char *)NM_I(sbi);
  67         else if (struct_type == F2FS_SBI || struct_type == RESERVED_BLOCKS)
  68                 return (unsigned char *)sbi;
  69 #ifdef CONFIG_F2FS_FAULT_INJECTION
  70         else if (struct_type == FAULT_INFO_RATE ||
  71                                         struct_type == FAULT_INFO_TYPE)
  72                 return (unsigned char *)&F2FS_OPTION(sbi).fault_info;
  73 #endif
  74 #ifdef CONFIG_F2FS_STAT_FS
  75         else if (struct_type == STAT_INFO)
  76                 return (unsigned char *)F2FS_STAT(sbi);
  77 #endif
  78         else if (struct_type == CPRC_INFO)
  79                 return (unsigned char *)&sbi->cprc_info;
  80         else if (struct_type == ATGC_INFO)
  81                 return (unsigned char *)&sbi->am;
  82         return NULL;
  83 }
  84
  85 static ssize_t dirty_segments_show(struct f2fs_attr *a,
  86                 struct f2fs_sb_info *sbi, char *buf)
  87 {
  88         return sprintf(buf, "%llu\n",
  89                         (unsigned long long)(dirty_segments(sbi)));
  90 }
  91
  92 static ssize_t free_segments_show(struct f2fs_attr *a,
  93                 struct f2fs_sb_info *sbi, char *buf)
  94 {
  95         return sprintf(buf, "%llu\n",
  96                         (unsigned long long)(free_segments(sbi)));
  97 }
  98
  99 static ssize_t ovp_segments_show(struct f2fs_attr *a,
 100                 struct f2fs_sb_info *sbi, char *buf)
 101 {
 102         return sprintf(buf, "%llu\n",
 103                         (unsigned long long)(overprovision_segments(sbi)));
 104 }
 105
 106 static ssize_t lifetime_write_kbytes_show(struct f2fs_attr *a,
 107                 struct f2fs_sb_info *sbi, char *buf)
 108 {
 109         return sprintf(buf, "%llu\n",
 110                         (unsigned long long)(sbi->kbytes_written +
 111                         ((f2fs_get_sectors_written(sbi) -
 112                                 sbi->sectors_written_start) >> 1)));
 113 }
 114
 115 static ssize_t sb_status_show(struct f2fs_attr *a,
 116                 struct f2fs_sb_info *sbi, char *buf)
 117 {
 118         return sprintf(buf, "%lx\n", sbi->s_flag);
 119 }
 120
 121 static ssize_t features_show(struct f2fs_attr *a,
 122                 struct f2fs_sb_info *sbi, char *buf)
 123 {
 124         int len = 0;
 125
 126         if (f2fs_sb_has_encrypt(sbi))
 127                 len += scnprintf(buf, PAGE_SIZE - len, "%s",
 128                                                 "encryption");
 129         if (f2fs_sb_has_blkzoned(sbi))
 130                 len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
 131                                 len ? ", " : "", "blkzoned");
 132         if (f2fs_sb_has_extra_attr(sbi))
 133                 len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
 134                                 len ? ", " : "", "extra_attr");
 135         if (f2fs_sb_has_project_quota(sbi))
 136                 len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
 137                                 len ? ", " : "", "projquota");
 138         if (f2fs_sb_has_inode_chksum(sbi))
 139                 len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
 140                                 len ? ", " : "", "inode_checksum");
 141         if (f2fs_sb_has_flexible_inline_xattr(sbi))
 142                 len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
 143                                 len ? ", " : "", "flexible_inline_xattr");
 144         if (f2fs_sb_has_quota_ino(sbi))
 145                 len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
 146                                 len ? ", " : "", "quota_ino");
 147         if (f2fs_sb_has_inode_crtime(sbi))
 148                 len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
 149                                 len ? ", " : "", "inode_crtime");
 150         if (f2fs_sb_has_lost_found(sbi))
 151                 len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
 152                                 len ? ", " : "", "lost_found");
 153         if (f2fs_sb_has_verity(sbi))
 154                 len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
 155                                 len ? ", " : "", "verity");
 156         if (f2fs_sb_has_sb_chksum(sbi))
 157                 len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
 158                                 len ? ", " : "", "sb_checksum");
 159         if (f2fs_sb_has_casefold(sbi))
 160                 len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
 161                                 len ? ", " : "", "casefold");
 162         if (f2fs_sb_has_readonly(sbi))
 163                 len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
 164                                 len ? ", " : "", "readonly");
 165         if (f2fs_sb_has_compression(sbi))
 166                 len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
 167                                 len ? ", " : "", "compression");
 168         len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
 169                                 len ? ", " : "", "pin_file");
 170         len += scnprintf(buf + len, PAGE_SIZE - len, "\n");
 171         return len;
 172 }
 173
 174 static ssize_t current_reserved_blocks_show(struct f2fs_attr *a,
 175                                         struct f2fs_sb_info *sbi, char *buf)
 176 {
 177         return sprintf(buf, "%u\n", sbi->current_reserved_blocks);
 178 }
 179
 180 static ssize_t unusable_show(struct f2fs_attr *a,
 181                 struct f2fs_sb_info *sbi, char *buf)
 182 {
 183         block_t unusable;
 184
 185         if (test_opt(sbi, DISABLE_CHECKPOINT))
 186                 unusable = sbi->unusable_block_count;
 187         else
 188                 unusable = f2fs_get_unusable_blocks(sbi);
 189         return sprintf(buf, "%llu\n", (unsigned long long)unusable);
 190 }
 191
 192 static ssize_t encoding_show(struct f2fs_attr *a,
 193                 struct f2fs_sb_info *sbi, char *buf)
 194 {
 195 #ifdef CONFIG_UNICODE
 196         struct super_block *sb = sbi->sb;
 197
 198         if (f2fs_sb_has_casefold(sbi))
 199                 return sysfs_emit(buf, "%s (%d.%d.%d)\n",
 200                         sb->s_encoding->charset,
 201                         (sb->s_encoding->version >> 16) & 0xff,
 202                         (sb->s_encoding->version >> 8) & 0xff,
 203                         sb->s_encoding->version & 0xff);
 204 #endif
 205         return sprintf(buf, "(none)");
 206 }
 207
 208 static ssize_t mounted_time_sec_show(struct f2fs_attr *a,
 209                 struct f2fs_sb_info *sbi, char *buf)
 210 {
 211         return sprintf(buf, "%llu", SIT_I(sbi)->mounted_time);
 212 }
 213
 214 #ifdef CONFIG_F2FS_STAT_FS
 215 static ssize_t moved_blocks_foreground_show(struct f2fs_attr *a,
 216                                 struct f2fs_sb_info *sbi, char *buf)
 217 {
 218         struct f2fs_stat_info *si = F2FS_STAT(sbi);
 219
 220         return sprintf(buf, "%llu\n",
 221                 (unsigned long long)(si->tot_blks -
 222                         (si->bg_data_blks + si->bg_node_blks)));
 223 }
 224
 225 static ssize_t moved_blocks_background_show(struct f2fs_attr *a,
 226                                 struct f2fs_sb_info *sbi, char *buf)
 227 {
 228         struct f2fs_stat_info *si = F2FS_STAT(sbi);
 229
 230         return sprintf(buf, "%llu\n",
 231                 (unsigned long long)(si->bg_data_blks + si->bg_node_blks));
 232 }
 233
 234 static ssize_t avg_vblocks_show(struct f2fs_attr *a,
 235                 struct f2fs_sb_info *sbi, char *buf)
 236 {
 237         struct f2fs_stat_info *si = F2FS_STAT(sbi);
 238
 239         si->dirty_count = dirty_segments(sbi);
 240         f2fs_update_sit_info(sbi);
 241         return sprintf(buf, "%llu\n", (unsigned long long)(si->avg_vblocks));
 242 }
 243 #endif
 244
 245 static ssize_t main_blkaddr_show(struct f2fs_attr *a,
 246                                 struct f2fs_sb_info *sbi, char *buf)
 247 {
 248         return sysfs_emit(buf, "%llu\n",
 249                         (unsigned long long)MAIN_BLKADDR(sbi));
 250 }
 251
 252 static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
 253                         struct f2fs_sb_info *sbi, char *buf)
 254 {
 255         unsigned char *ptr = NULL;
 256         unsigned int *ui;
 257
 258         ptr = __struct_ptr(sbi, a->struct_type);
 259         if (!ptr)
 260                 return -EINVAL;
 261
 262         if (!strcmp(a->attr.name, "extension_list")) {
 263                 __u8 (*extlist)[F2FS_EXTENSION_LEN] =
 264                                         sbi->raw_super->extension_list;
 265                 int cold_count = le32_to_cpu(sbi->raw_super->extension_count);
 266                 int hot_count = sbi->raw_super->hot_ext_count;
 267                 int len = 0, i;
 268
 269                 len += scnprintf(buf + len, PAGE_SIZE - len,
 270                                                 "cold file extension:\n");
 271                 for (i = 0; i < cold_count; i++)
 272                         len += scnprintf(buf + len, PAGE_SIZE - len, "%s\n",
 273                                                                 extlist[i]);
 274
 275                 len += scnprintf(buf + len, PAGE_SIZE - len,
 276                                                 "hot file extension:\n");
 277                 for (i = cold_count; i < cold_count + hot_count; i++)
 278                         len += scnprintf(buf + len, PAGE_SIZE - len, "%s\n",
 279                                                                 extlist[i]);
 280                 return len;
 281         }
 282
 283         if (!strcmp(a->attr.name, "ckpt_thread_ioprio")) {
 284                 struct ckpt_req_control *cprc = &sbi->cprc_info;
 285                 int len = 0;
 286                 int class = IOPRIO_PRIO_CLASS(cprc->ckpt_thread_ioprio);
 287                 int data = IOPRIO_PRIO_DATA(cprc->ckpt_thread_ioprio);
 288
 289                 if (class == IOPRIO_CLASS_RT)
 290                         len += scnprintf(buf + len, PAGE_SIZE - len, "rt,");
 291                 else if (class == IOPRIO_CLASS_BE)
 292                         len += scnprintf(buf + len, PAGE_SIZE - len, "be,");
 293                 else
 294                         return -EINVAL;
 295
 296                 len += scnprintf(buf + len, PAGE_SIZE - len, "%d\n", data);
 297                 return len;
 298         }
 299
 300 #ifdef CONFIG_F2FS_FS_COMPRESSION
 301         if (!strcmp(a->attr.name, "compr_written_block"))
 302                 return sysfs_emit(buf, "%llu\n", sbi->compr_written_block);
 303
 304         if (!strcmp(a->attr.name, "compr_saved_block"))
 305                 return sysfs_emit(buf, "%llu\n", sbi->compr_saved_block);
 306
 307         if (!strcmp(a->attr.name, "compr_new_inode"))
 308                 return sysfs_emit(buf, "%u\n", sbi->compr_new_inode);
 309 #endif
 310
 311         if (!strcmp(a->attr.name, "gc_segment_mode"))
 312                 return sysfs_emit(buf, "%u\n", sbi->gc_segment_mode);
 313
 314         if (!strcmp(a->attr.name, "gc_reclaimed_segments")) {
 315                 return sysfs_emit(buf, "%u\n",
 316                         sbi->gc_reclaimed_segs[sbi->gc_segment_mode]);
 317         }
 318
 319         ui = (unsigned int *)(ptr + a->offset);
 320
 321         return sprintf(buf, "%u\n", *ui);
 322 }
 323
 324 static ssize_t __sbi_store(struct f2fs_attr *a,
 325                         struct f2fs_sb_info *sbi,
 326                         const char *buf, size_t count)
 327 {
 328         unsigned char *ptr;
 329         unsigned long t;
 330         unsigned int *ui;
 331         ssize_t ret;
 332
 333         ptr = __struct_ptr(sbi, a->struct_type);
 334         if (!ptr)
 335                 return -EINVAL;
 336
 337         if (!strcmp(a->attr.name, "extension_list")) {
 338                 const char *name = strim((char *)buf);
 339                 bool set = true, hot;
 340
 341                 if (!strncmp(name, "[h]", 3))
 342                         hot = true;
 343                 else if (!strncmp(name, "[c]", 3))
 344                         hot = false;
 345                 else
 346                         return -EINVAL;
 347
 348                 name += 3;
 349
 350                 if (*name == '!') {
 351                         name++;
 352                         set = false;
 353                 }
 354
 355                 if (!strlen(name) || strlen(name) >= F2FS_EXTENSION_LEN)
 356                         return -EINVAL;
 357
 358                 down_write(&sbi->sb_lock);
 359
 360                 ret = f2fs_update_extension_list(sbi, name, hot, set);
 361                 if (ret)
 362                         goto out;
 363
 364                 ret = f2fs_commit_super(sbi, false);
 365                 if (ret)
 366                         f2fs_update_extension_list(sbi, name, hot, !set);
 367 out:
 368                 up_write(&sbi->sb_lock);
 369                 return ret ? ret : count;
 370         }
 371
 372         if (!strcmp(a->attr.name, "ckpt_thread_ioprio")) {
 373                 const char *name = strim((char *)buf);
 374                 struct ckpt_req_control *cprc = &sbi->cprc_info;
 375                 int class;
 376                 long data;
 377                 int ret;
 378
 379                 if (!strncmp(name, "rt,", 3))
 380                         class = IOPRIO_CLASS_RT;
 381                 else if (!strncmp(name, "be,", 3))
 382                         class = IOPRIO_CLASS_BE;
 383                 else
 384                         return -EINVAL;
 385
 386                 name += 3;
 387                 ret = kstrtol(name, 10, &data);
 388                 if (ret)
 389                         return ret;
 390                 if (data >= IOPRIO_NR_LEVELS || data < 0)
 391                         return -EINVAL;
 392
 393                 cprc->ckpt_thread_ioprio = IOPRIO_PRIO_VALUE(class, data);
 394                 if (test_opt(sbi, MERGE_CHECKPOINT)) {
 395                         ret = set_task_ioprio(cprc->f2fs_issue_ckpt,
 396                                         cprc->ckpt_thread_ioprio);
 397                         if (ret)
 398                                 return ret;
 399                 }
 400
 401                 return count;
 402         }
 403
 404         ui = (unsigned int *)(ptr + a->offset);
 405
 406         ret = kstrtoul(skip_spaces(buf), 0, &t);
 407         if (ret < 0)
 408                 return ret;
 409 #ifdef CONFIG_F2FS_FAULT_INJECTION
 410         if (a->struct_type == FAULT_INFO_TYPE && t >= (1 << FAULT_MAX))
 411                 return -EINVAL;
 412         if (a->struct_type == FAULT_INFO_RATE && t >= UINT_MAX)
 413                 return -EINVAL;
 414 #endif
 415         if (a->struct_type == RESERVED_BLOCKS) {
 416                 spin_lock(&sbi->stat_lock);
 417                 if (t > (unsigned long)(sbi->user_block_count -
 418                                 F2FS_OPTION(sbi).root_reserved_blocks)) {
 419                         spin_unlock(&sbi->stat_lock);
 420                         return -EINVAL;
 421                 }
 422                 *ui = t;
 423                 sbi->current_reserved_blocks = min(sbi->reserved_blocks,
 424                                 sbi->user_block_count - valid_user_blocks(sbi));
 425                 spin_unlock(&sbi->stat_lock);
 426                 return count;
 427         }
 428
 429         if (!strcmp(a->attr.name, "discard_granularity")) {
 430                 if (t == 0 || t > MAX_PLIST_NUM)
 431                         return -EINVAL;
 432                 if (!f2fs_block_unit_discard(sbi))
 433                         return -EINVAL;
 434                 if (t == *ui)
 435                         return count;
 436                 *ui = t;
 437                 return count;
 438         }
 439
 440         if (!strcmp(a->attr.name, "migration_granularity")) {
 441                 if (t == 0 || t > sbi->segs_per_sec)
 442                         return -EINVAL;
 443         }
 444
 445         if (!strcmp(a->attr.name, "trim_sections"))
 446                 return -EINVAL;
 447
 448         if (!strcmp(a->attr.name, "gc_urgent")) {
 449                 if (t == 0) {
 450                         sbi->gc_mode = GC_NORMAL;
 451                 } else if (t == 1) {
 452                         sbi->gc_mode = GC_URGENT_HIGH;
 453                         if (sbi->gc_thread) {
 454                                 sbi->gc_thread->gc_wake = 1;
 455                                 wake_up_interruptible_all(
 456                                         &sbi->gc_thread->gc_wait_queue_head);
 457                                 wake_up_discard_thread(sbi, true);
 458                         }
 459                 } else if (t == 2) {
 460                         sbi->gc_mode = GC_URGENT_LOW;
 461                 } else {
 462                         return -EINVAL;
 463                 }
 464                 return count;
 465         }
 466         if (!strcmp(a->attr.name, "gc_idle")) {
 467                 if (t == GC_IDLE_CB) {
 468                         sbi->gc_mode = GC_IDLE_CB;
 469                 } else if (t == GC_IDLE_GREEDY) {
 470                         sbi->gc_mode = GC_IDLE_GREEDY;
 471                 } else if (t == GC_IDLE_AT) {
 472                         if (!sbi->am.atgc_enabled)
 473                                 return -EINVAL;
 474                         sbi->gc_mode = GC_AT;
 475                 } else {
 476                         sbi->gc_mode = GC_NORMAL;
 477                 }
 478                 return count;
 479         }
 480
 481 #ifdef CONFIG_F2FS_IOSTAT
 482         if (!strcmp(a->attr.name, "iostat_enable")) {
 483                 sbi->iostat_enable = !!t;
 484                 if (!sbi->iostat_enable)
 485                         f2fs_reset_iostat(sbi);
 486                 return count;
 487         }
 488
 489         if (!strcmp(a->attr.name, "iostat_period_ms")) {
 490                 if (t < MIN_IOSTAT_PERIOD_MS || t > MAX_IOSTAT_PERIOD_MS)
 491                         return -EINVAL;
 492                 spin_lock(&sbi->iostat_lock);
 493                 sbi->iostat_period_ms = (unsigned int)t;
 494                 spin_unlock(&sbi->iostat_lock);
 495                 return count;
 496         }
 497 #endif
 498
 499 #ifdef CONFIG_F2FS_FS_COMPRESSION
 500         if (!strcmp(a->attr.name, "compr_written_block") ||
 501                 !strcmp(a->attr.name, "compr_saved_block")) {
 502                 if (t != 0)
 503                         return -EINVAL;
 504                 sbi->compr_written_block = 0;
 505                 sbi->compr_saved_block = 0;
 506                 return count;
 507         }
 508
 509         if (!strcmp(a->attr.name, "compr_new_inode")) {
 510                 if (t != 0)
 511                         return -EINVAL;
 512                 sbi->compr_new_inode = 0;
 513                 return count;
 514         }
 515 #endif
 516
 517         if (!strcmp(a->attr.name, "atgc_candidate_ratio")) {
 518                 if (t > 100)
 519                         return -EINVAL;
 520                 sbi->am.candidate_ratio = t;
 521                 return count;
 522         }
 523
 524         if (!strcmp(a->attr.name, "atgc_age_weight")) {
 525                 if (t > 100)
 526                         return -EINVAL;
 527                 sbi->am.age_weight = t;
 528                 return count;
 529         }
 530
 531         if (!strcmp(a->attr.name, "gc_segment_mode")) {
 532                 if (t < MAX_GC_MODE)
 533                         sbi->gc_segment_mode = t;
 534                 else
 535                         return -EINVAL;
 536                 return count;
 537         }
 538
 539         if (!strcmp(a->attr.name, "gc_reclaimed_segments")) {
 540                 if (t != 0)
 541                         return -EINVAL;
 542                 sbi->gc_reclaimed_segs[sbi->gc_segment_mode] = 0;
 543                 return count;
 544         }
 545
 546         if (!strcmp(a->attr.name, "seq_file_ra_mul")) {
 547                 if (t >= MIN_RA_MUL && t <= MAX_RA_MUL)
 548                         sbi->seq_file_ra_mul = t;
 549                 else
 550                         return -EINVAL;
 551                 return count;
 552         }
 553
 554         if (!strcmp(a->attr.name, "max_fragment_chunk")) {
 555                 if (t >= MIN_FRAGMENT_SIZE && t <= MAX_FRAGMENT_SIZE)
 556                         sbi->max_fragment_chunk = t;
 557                 else
 558                         return -EINVAL;
 559                 return count;
 560         }
 561
 562         if (!strcmp(a->attr.name, "max_fragment_hole")) {
 563                 if (t >= MIN_FRAGMENT_SIZE && t <= MAX_FRAGMENT_SIZE)
 564                         sbi->max_fragment_hole = t;
 565                 else
 566                         return -EINVAL;
 567                 return count;
 568         }
 569
 570         *ui = (unsigned int)t;
 571
 572         return count;
 573 }
 574
 575 static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
 576                         struct f2fs_sb_info *sbi,
 577                         const char *buf, size_t count)
 578 {
 579         ssize_t ret;
 580         bool gc_entry = (!strcmp(a->attr.name, "gc_urgent") ||
 581                                         a->struct_type == GC_THREAD);
 582
 583         if (gc_entry) {
 584                 if (!down_read_trylock(&sbi->sb->s_umount))
 585                         return -EAGAIN;
 586         }
 587         ret = __sbi_store(a, sbi, buf, count);
 588         if (gc_entry)
 589                 up_read(&sbi->sb->s_umount);
 590
 591         return ret;
 592 }
 593
 594 static ssize_t f2fs_attr_show(struct kobject *kobj,
 595                                 struct attribute *attr, char *buf)
 596 {
 597         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
 598                                                                 s_kobj);
 599         struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
 600
 601         return a->show ? a->show(a, sbi, buf) : 0;
 602 }
 603
 604 static ssize_t f2fs_attr_store(struct kobject *kobj, struct attribute *attr,
 605                                                 const char *buf, size_t len)
 606 {
 607         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
 608                                                                         s_kobj);
 609         struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
 610
 611         return a->store ? a->store(a, sbi, buf, len) : 0;
 612 }
 613
 614 static void f2fs_sb_release(struct kobject *kobj)
 615 {
 616         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
 617                                                                 s_kobj);
 618         complete(&sbi->s_kobj_unregister);
 619 }
 620
 621 /*
 622  * Note that there are three feature list entries:
 623  * 1) /sys/fs/f2fs/features
 624  *   : shows runtime features supported by in-kernel f2fs along with Kconfig.
 625  *     - ref. F2FS_FEATURE_RO_ATTR()
 626  *
 627  * 2) /sys/fs/f2fs/$s_id/features <deprecated>
 628  *   : shows on-disk features enabled by mkfs.f2fs, used for old kernels. This
 629  *     won't add new feature anymore, and thus, users should check entries in 3)
 630  *     instead of this 2).
 631  *
 632  * 3) /sys/fs/f2fs/$s_id/feature_list
 633  *   : shows on-disk features enabled by mkfs.f2fs per instance, which follows
 634  *     sysfs entry rule where each entry should expose single value.
 635  *     This list covers old feature list provided by 2) and beyond. Therefore,
 636  *     please add new on-disk feature in this list only.
 637  *     - ref. F2FS_SB_FEATURE_RO_ATTR()
 638  */
 639 static ssize_t f2fs_feature_show(struct f2fs_attr *a,
 640                 struct f2fs_sb_info *sbi, char *buf)
 641 {
 642         return sprintf(buf, "supported\n");
 643 }
 644
 645 #define F2FS_FEATURE_RO_ATTR(_name)                             \
 646 static struct f2fs_attr f2fs_attr_##_name = {                   \
 647         .attr = {.name = __stringify(_name), .mode = 0444 },    \
 648         .show   = f2fs_feature_show,                            \
 649 }
 650
 651 static ssize_t f2fs_sb_feature_show(struct f2fs_attr *a,
 652                 struct f2fs_sb_info *sbi, char *buf)
 653 {
 654         if (F2FS_HAS_FEATURE(sbi, a->id))
 655                 return sprintf(buf, "supported\n");
 656         return sprintf(buf, "unsupported\n");
 657 }
 658
 659 #define F2FS_SB_FEATURE_RO_ATTR(_name, _feat)                   \
 660 static struct f2fs_attr f2fs_attr_sb_##_name = {                \
 661         .attr = {.name = __stringify(_name), .mode = 0444 },    \
 662         .show   = f2fs_sb_feature_show,                         \
 663         .id     = F2FS_FEATURE_##_feat,                         \
 664 }
 665
 666 #define F2FS_ATTR_OFFSET(_struct_type, _name, _mode, _show, _store, _offset) \
 667 static struct f2fs_attr f2fs_attr_##_name = {                   \
 668         .attr = {.name = __stringify(_name), .mode = _mode },   \
 669         .show   = _show,                                        \
 670         .store  = _store,                                       \
 671         .struct_type = _struct_type,                            \
 672         .offset = _offset                                       \
 673 }
 674
 675 #define F2FS_RW_ATTR(struct_type, struct_name, name, elname)    \
 676         F2FS_ATTR_OFFSET(struct_type, name, 0644,               \
 677                 f2fs_sbi_show, f2fs_sbi_store,                  \
 678                 offsetof(struct struct_name, elname))
 679
 680 #define F2FS_GENERAL_RO_ATTR(name) \
 681 static struct f2fs_attr f2fs_attr_##name = __ATTR(name, 0444, name##_show, NULL)
 682
 683 #define F2FS_STAT_ATTR(_struct_type, _struct_name, _name, _elname)      \
 684 static struct f2fs_attr f2fs_attr_##_name = {                   \
 685         .attr = {.name = __stringify(_name), .mode = 0444 },    \
 686         .show = f2fs_sbi_show,                                  \
 687         .struct_type = _struct_type,                            \
 688         .offset = offsetof(struct _struct_name, _elname),       \
 689 }
 690
 691 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_urgent_sleep_time,
 692                                                         urgent_sleep_time);
 693 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_min_sleep_time, min_sleep_time);
 694 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_max_sleep_time, max_sleep_time);
 695 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time);
 696 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, gc_idle, gc_mode);
 697 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, gc_urgent, gc_mode);
 698 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments);
 699 F2FS_RW_ATTR(DCC_INFO, discard_cmd_control, max_small_discards, max_discards);
 700 F2FS_RW_ATTR(DCC_INFO, discard_cmd_control, discard_granularity, discard_granularity);
 701 F2FS_RW_ATTR(RESERVED_BLOCKS, f2fs_sb_info, reserved_blocks, reserved_blocks);
 702 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, batched_trim_sections, trim_sections);
 703 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy);
 704 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util);
 705 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_fsync_blocks, min_fsync_blocks);
 706 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_seq_blocks, min_seq_blocks);
 707 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_hot_blocks, min_hot_blocks);
 708 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ssr_sections, min_ssr_sections);
 709 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ram_thresh, ram_thresh);
 710 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ra_nid_pages, ra_nid_pages);
 711 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, dirty_nats_ratio, dirty_nats_ratio);
 712 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search);
 713 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, migration_granularity, migration_granularity);
 714 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level);
 715 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, cp_interval, interval_time[CP_TIME]);
 716 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, idle_interval, interval_time[REQ_TIME]);
 717 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, discard_idle_interval,
 718                                         interval_time[DISCARD_TIME]);
 719 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, gc_idle_interval, interval_time[GC_TIME]);
 720 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info,
 721                 umount_discard_timeout, interval_time[UMOUNT_DISCARD_TIMEOUT]);
 722 #ifdef CONFIG_F2FS_IOSTAT
 723 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, iostat_enable, iostat_enable);
 724 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, iostat_period_ms, iostat_period_ms);
 725 #endif
 726 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, readdir_ra, readdir_ra);
 727 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_io_bytes, max_io_bytes);
 728 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, gc_pin_file_thresh, gc_pin_file_threshold);
 729 F2FS_RW_ATTR(F2FS_SBI, f2fs_super_block, extension_list, extension_list);
 730 #ifdef CONFIG_F2FS_FAULT_INJECTION
 731 F2FS_RW_ATTR(FAULT_INFO_RATE, f2fs_fault_info, inject_rate, inject_rate);
 732 F2FS_RW_ATTR(FAULT_INFO_TYPE, f2fs_fault_info, inject_type, inject_type);
 733 #endif
 734 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, data_io_flag, data_io_flag);
 735 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, node_io_flag, node_io_flag);
 736 F2FS_RW_ATTR(CPRC_INFO, ckpt_req_control, ckpt_thread_ioprio, ckpt_thread_ioprio);
 737 F2FS_GENERAL_RO_ATTR(dirty_segments);
 738 F2FS_GENERAL_RO_ATTR(free_segments);
 739 F2FS_GENERAL_RO_ATTR(ovp_segments);
 740 F2FS_GENERAL_RO_ATTR(lifetime_write_kbytes);
 741 F2FS_GENERAL_RO_ATTR(features);
 742 F2FS_GENERAL_RO_ATTR(current_reserved_blocks);
 743 F2FS_GENERAL_RO_ATTR(unusable);
 744 F2FS_GENERAL_RO_ATTR(encoding);
 745 F2FS_GENERAL_RO_ATTR(mounted_time_sec);
 746 F2FS_GENERAL_RO_ATTR(main_blkaddr);
 747 #ifdef CONFIG_F2FS_STAT_FS
 748 F2FS_STAT_ATTR(STAT_INFO, f2fs_stat_info, cp_foreground_calls, cp_count);
 749 F2FS_STAT_ATTR(STAT_INFO, f2fs_stat_info, cp_background_calls, bg_cp_count);
 750 F2FS_STAT_ATTR(STAT_INFO, f2fs_stat_info, gc_foreground_calls, call_count);
 751 F2FS_STAT_ATTR(STAT_INFO, f2fs_stat_info, gc_background_calls, bg_gc);
 752 F2FS_GENERAL_RO_ATTR(moved_blocks_background);
 753 F2FS_GENERAL_RO_ATTR(moved_blocks_foreground);
 754 F2FS_GENERAL_RO_ATTR(avg_vblocks);
 755 #endif
 756
 757 #ifdef CONFIG_FS_ENCRYPTION
 758 F2FS_FEATURE_RO_ATTR(encryption);
 759 F2FS_FEATURE_RO_ATTR(test_dummy_encryption_v2);
 760 #ifdef CONFIG_UNICODE
 761 F2FS_FEATURE_RO_ATTR(encrypted_casefold);
 762 #endif
 763 #endif /* CONFIG_FS_ENCRYPTION */
 764 #ifdef CONFIG_BLK_DEV_ZONED
 765 F2FS_FEATURE_RO_ATTR(block_zoned);
 766 #endif
 767 F2FS_FEATURE_RO_ATTR(atomic_write);
 768 F2FS_FEATURE_RO_ATTR(extra_attr);
 769 F2FS_FEATURE_RO_ATTR(project_quota);
 770 F2FS_FEATURE_RO_ATTR(inode_checksum);
 771 F2FS_FEATURE_RO_ATTR(flexible_inline_xattr);
 772 F2FS_FEATURE_RO_ATTR(quota_ino);
 773 F2FS_FEATURE_RO_ATTR(inode_crtime);
 774 F2FS_FEATURE_RO_ATTR(lost_found);
 775 #ifdef CONFIG_FS_VERITY
 776 F2FS_FEATURE_RO_ATTR(verity);
 777 #endif
 778 F2FS_FEATURE_RO_ATTR(sb_checksum);
 779 #ifdef CONFIG_UNICODE
 780 F2FS_FEATURE_RO_ATTR(casefold);
 781 #endif
 782 F2FS_FEATURE_RO_ATTR(readonly);
 783 #ifdef CONFIG_F2FS_FS_COMPRESSION
 784 F2FS_FEATURE_RO_ATTR(compression);
 785 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, compr_written_block, compr_written_block);
 786 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, compr_saved_block, compr_saved_block);
 787 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, compr_new_inode, compr_new_inode);
 788 #endif
 789 F2FS_FEATURE_RO_ATTR(pin_file);
 790
 791 /* For ATGC */
 792 F2FS_RW_ATTR(ATGC_INFO, atgc_management, atgc_candidate_ratio, candidate_ratio);
 793 F2FS_RW_ATTR(ATGC_INFO, atgc_management, atgc_candidate_count, max_candidate_count);
 794 F2FS_RW_ATTR(ATGC_INFO, atgc_management, atgc_age_weight, age_weight);
 795 F2FS_RW_ATTR(ATGC_INFO, atgc_management, atgc_age_threshold, age_threshold);
 796
 797 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, seq_file_ra_mul, seq_file_ra_mul);
 798 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, gc_segment_mode, gc_segment_mode);
 799 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, gc_reclaimed_segments, gc_reclaimed_segs);
 800 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_fragment_chunk, max_fragment_chunk);
 801 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_fragment_hole, max_fragment_hole);
 802
 803 #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
 804 static struct attribute *f2fs_attrs[] = {
 805         ATTR_LIST(gc_urgent_sleep_time),
 806         ATTR_LIST(gc_min_sleep_time),
 807         ATTR_LIST(gc_max_sleep_time),
 808         ATTR_LIST(gc_no_gc_sleep_time),
 809         ATTR_LIST(gc_idle),
 810         ATTR_LIST(gc_urgent),
 811         ATTR_LIST(reclaim_segments),
 812         ATTR_LIST(main_blkaddr),
 813         ATTR_LIST(max_small_discards),
 814         ATTR_LIST(discard_granularity),
 815         ATTR_LIST(batched_trim_sections),
 816         ATTR_LIST(ipu_policy),
 817         ATTR_LIST(min_ipu_util),
 818         ATTR_LIST(min_fsync_blocks),
 819         ATTR_LIST(min_seq_blocks),
 820         ATTR_LIST(min_hot_blocks),
 821         ATTR_LIST(min_ssr_sections),
 822         ATTR_LIST(max_victim_search),
 823         ATTR_LIST(migration_granularity),
 824         ATTR_LIST(dir_level),
 825         ATTR_LIST(ram_thresh),
 826         ATTR_LIST(ra_nid_pages),
 827         ATTR_LIST(dirty_nats_ratio),
 828         ATTR_LIST(cp_interval),
 829         ATTR_LIST(idle_interval),
 830         ATTR_LIST(discard_idle_interval),
 831         ATTR_LIST(gc_idle_interval),
 832         ATTR_LIST(umount_discard_timeout),
 833 #ifdef CONFIG_F2FS_IOSTAT
 834         ATTR_LIST(iostat_enable),
 835         ATTR_LIST(iostat_period_ms),
 836 #endif
 837         ATTR_LIST(readdir_ra),
 838         ATTR_LIST(max_io_bytes),
 839         ATTR_LIST(gc_pin_file_thresh),
 840         ATTR_LIST(extension_list),
 841 #ifdef CONFIG_F2FS_FAULT_INJECTION
 842         ATTR_LIST(inject_rate),
 843         ATTR_LIST(inject_type),
 844 #endif
 845         ATTR_LIST(data_io_flag),
 846         ATTR_LIST(node_io_flag),
 847         ATTR_LIST(ckpt_thread_ioprio),
 848         ATTR_LIST(dirty_segments),
 849         ATTR_LIST(free_segments),
 850         ATTR_LIST(ovp_segments),
 851         ATTR_LIST(unusable),
 852         ATTR_LIST(lifetime_write_kbytes),
 853         ATTR_LIST(features),
 854         ATTR_LIST(reserved_blocks),
 855         ATTR_LIST(current_reserved_blocks),
 856         ATTR_LIST(encoding),
 857         ATTR_LIST(mounted_time_sec),
 858 #ifdef CONFIG_F2FS_STAT_FS
 859         ATTR_LIST(cp_foreground_calls),
 860         ATTR_LIST(cp_background_calls),
 861         ATTR_LIST(gc_foreground_calls),
 862         ATTR_LIST(gc_background_calls),
 863         ATTR_LIST(moved_blocks_foreground),
 864         ATTR_LIST(moved_blocks_background),
 865         ATTR_LIST(avg_vblocks),
 866 #endif
 867 #ifdef CONFIG_F2FS_FS_COMPRESSION
 868         ATTR_LIST(compr_written_block),
 869         ATTR_LIST(compr_saved_block),
 870         ATTR_LIST(compr_new_inode),
 871 #endif
 872         /* For ATGC */
 873         ATTR_LIST(atgc_candidate_ratio),
 874         ATTR_LIST(atgc_candidate_count),
 875         ATTR_LIST(atgc_age_weight),
 876         ATTR_LIST(atgc_age_threshold),
 877         ATTR_LIST(seq_file_ra_mul),
 878         ATTR_LIST(gc_segment_mode),
 879         ATTR_LIST(gc_reclaimed_segments),
 880         ATTR_LIST(max_fragment_chunk),
 881         ATTR_LIST(max_fragment_hole),
 882         NULL,
 883 };
 884 ATTRIBUTE_GROUPS(f2fs);
 885
 886 static struct attribute *f2fs_feat_attrs[] = {
 887 #ifdef CONFIG_FS_ENCRYPTION
 888         ATTR_LIST(encryption),
 889         ATTR_LIST(test_dummy_encryption_v2),
 890 #ifdef CONFIG_UNICODE
 891         ATTR_LIST(encrypted_casefold),
 892 #endif
 893 #endif /* CONFIG_FS_ENCRYPTION */
 894 #ifdef CONFIG_BLK_DEV_ZONED
 895         ATTR_LIST(block_zoned),
 896 #endif
 897         ATTR_LIST(atomic_write),
 898         ATTR_LIST(extra_attr),
 899         ATTR_LIST(project_quota),
 900         ATTR_LIST(inode_checksum),
 901         ATTR_LIST(flexible_inline_xattr),
 902         ATTR_LIST(quota_ino),
 903         ATTR_LIST(inode_crtime),
 904         ATTR_LIST(lost_found),
 905 #ifdef CONFIG_FS_VERITY
 906         ATTR_LIST(verity),
 907 #endif
 908         ATTR_LIST(sb_checksum),
 909 #ifdef CONFIG_UNICODE
 910         ATTR_LIST(casefold),
 911 #endif
 912         ATTR_LIST(readonly),
 913 #ifdef CONFIG_F2FS_FS_COMPRESSION
 914         ATTR_LIST(compression),
 915 #endif
 916         ATTR_LIST(pin_file),
 917         NULL,
 918 };
 919 ATTRIBUTE_GROUPS(f2fs_feat);
 920
 921 F2FS_GENERAL_RO_ATTR(sb_status);
 922 static struct attribute *f2fs_stat_attrs[] = {
 923         ATTR_LIST(sb_status),
 924         NULL,
 925 };
 926 ATTRIBUTE_GROUPS(f2fs_stat);
 927
 928 F2FS_SB_FEATURE_RO_ATTR(encryption, ENCRYPT);
 929 F2FS_SB_FEATURE_RO_ATTR(block_zoned, BLKZONED);
 930 F2FS_SB_FEATURE_RO_ATTR(extra_attr, EXTRA_ATTR);
 931 F2FS_SB_FEATURE_RO_ATTR(project_quota, PRJQUOTA);
 932 F2FS_SB_FEATURE_RO_ATTR(inode_checksum, INODE_CHKSUM);
 933 F2FS_SB_FEATURE_RO_ATTR(flexible_inline_xattr, FLEXIBLE_INLINE_XATTR);
 934 F2FS_SB_FEATURE_RO_ATTR(quota_ino, QUOTA_INO);
 935 F2FS_SB_FEATURE_RO_ATTR(inode_crtime, INODE_CRTIME);
 936 F2FS_SB_FEATURE_RO_ATTR(lost_found, LOST_FOUND);
 937 F2FS_SB_FEATURE_RO_ATTR(verity, VERITY);
 938 F2FS_SB_FEATURE_RO_ATTR(sb_checksum, SB_CHKSUM);
 939 F2FS_SB_FEATURE_RO_ATTR(casefold, CASEFOLD);
 940 F2FS_SB_FEATURE_RO_ATTR(compression, COMPRESSION);
 941 F2FS_SB_FEATURE_RO_ATTR(readonly, RO);
 942
 943 static struct attribute *f2fs_sb_feat_attrs[] = {
 944         ATTR_LIST(sb_encryption),
 945         ATTR_LIST(sb_block_zoned),
 946         ATTR_LIST(sb_extra_attr),
 947         ATTR_LIST(sb_project_quota),
 948         ATTR_LIST(sb_inode_checksum),
 949         ATTR_LIST(sb_flexible_inline_xattr),
 950         ATTR_LIST(sb_quota_ino),
 951         ATTR_LIST(sb_inode_crtime),
 952         ATTR_LIST(sb_lost_found),
 953         ATTR_LIST(sb_verity),
 954         ATTR_LIST(sb_sb_checksum),
 955         ATTR_LIST(sb_casefold),
 956         ATTR_LIST(sb_compression),
 957         ATTR_LIST(sb_readonly),
 958         NULL,
 959 };
 960 ATTRIBUTE_GROUPS(f2fs_sb_feat);
 961
 962 static const struct sysfs_ops f2fs_attr_ops = {
 963         .show   = f2fs_attr_show,
 964         .store  = f2fs_attr_store,
 965 };
 966
 967 static struct kobj_type f2fs_sb_ktype = {
 968         .default_groups = f2fs_groups,
 969         .sysfs_ops      = &f2fs_attr_ops,
 970         .release        = f2fs_sb_release,
 971 };
 972
 973 static struct kobj_type f2fs_ktype = {
 974         .sysfs_ops      = &f2fs_attr_ops,
 975 };
 976
 977 static struct kset f2fs_kset = {
 978         .kobj   = {.ktype = &f2fs_ktype},
 979 };
 980
 981 static struct kobj_type f2fs_feat_ktype = {
 982         .default_groups = f2fs_feat_groups,
 983         .sysfs_ops      = &f2fs_attr_ops,
 984 };
 985
 986 static struct kobject f2fs_feat = {
 987         .kset   = &f2fs_kset,
 988 };
 989
 990 static ssize_t f2fs_stat_attr_show(struct kobject *kobj,
 991                                 struct attribute *attr, char *buf)
 992 {
 993         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
 994                                                                 s_stat_kobj);
 995         struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
 996
 997         return a->show ? a->show(a, sbi, buf) : 0;
 998 }
 999
1000 static ssize_t f2fs_stat_attr_store(struct kobject *kobj, struct attribute *attr,
1001                                                 const char *buf, size_t len)
1002 {
1003         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
1004                                                                 s_stat_kobj);
1005         struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
1006
1007         return a->store ? a->store(a, sbi, buf, len) : 0;
1008 }
1009
1010 static void f2fs_stat_kobj_release(struct kobject *kobj)
1011 {
1012         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
1013                                                                 s_stat_kobj);
1014         complete(&sbi->s_stat_kobj_unregister);
1015 }
1016
1017 static const struct sysfs_ops f2fs_stat_attr_ops = {
1018         .show   = f2fs_stat_attr_show,
1019         .store  = f2fs_stat_attr_store,
1020 };
1021
1022 static struct kobj_type f2fs_stat_ktype = {
1023         .default_groups = f2fs_stat_groups,
1024         .sysfs_ops      = &f2fs_stat_attr_ops,
1025         .release        = f2fs_stat_kobj_release,
1026 };
1027
1028 static ssize_t f2fs_sb_feat_attr_show(struct kobject *kobj,
1029                                 struct attribute *attr, char *buf)
1030 {
1031         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
1032                                                         s_feature_list_kobj);
1033         struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
1034
1035         return a->show ? a->show(a, sbi, buf) : 0;
1036 }
1037
1038 static void f2fs_feature_list_kobj_release(struct kobject *kobj)
1039 {
1040         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
1041                                                         s_feature_list_kobj);
1042         complete(&sbi->s_feature_list_kobj_unregister);
1043 }
1044
1045 static const struct sysfs_ops f2fs_feature_list_attr_ops = {
1046         .show   = f2fs_sb_feat_attr_show,
1047 };
1048
1049 static struct kobj_type f2fs_feature_list_ktype = {
1050         .default_groups = f2fs_sb_feat_groups,
1051         .sysfs_ops      = &f2fs_feature_list_attr_ops,
1052         .release        = f2fs_feature_list_kobj_release,
1053 };
1054
1055 static int __maybe_unused segment_info_seq_show(struct seq_file *seq,
1056                                                 void *offset)
1057 {
1058         struct super_block *sb = seq->private;
1059         struct f2fs_sb_info *sbi = F2FS_SB(sb);
1060         unsigned int total_segs =
1061                         le32_to_cpu(sbi->raw_super->segment_count_main);
1062         int i;
1063
1064         seq_puts(seq, "format: segment_type|valid_blocks\n"
1065                 "segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");
1066
1067         for (i = 0; i < total_segs; i++) {
1068                 struct seg_entry *se = get_seg_entry(sbi, i);
1069
1070                 if ((i % 10) == 0)
1071                         seq_printf(seq, "%-10d", i);
1072                 seq_printf(seq, "%d|%-3u", se->type, se->valid_blocks);
1073                 if ((i % 10) == 9 || i == (total_segs - 1))
1074                         seq_putc(seq, '\n');
1075                 else
1076                         seq_putc(seq, ' ');
1077         }
1078
1079         return 0;
1080 }
1081
1082 static int __maybe_unused segment_bits_seq_show(struct seq_file *seq,
1083                                                 void *offset)
1084 {
1085         struct super_block *sb = seq->private;
1086         struct f2fs_sb_info *sbi = F2FS_SB(sb);
1087         unsigned int total_segs =
1088                         le32_to_cpu(sbi->raw_super->segment_count_main);
1089         int i, j;
1090
1091         seq_puts(seq, "format: segment_type|valid_blocks|bitmaps\n"
1092                 "segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");
1093
1094         for (i = 0; i < total_segs; i++) {
1095                 struct seg_entry *se = get_seg_entry(sbi, i);
1096
1097                 seq_printf(seq, "%-10d", i);
1098                 seq_printf(seq, "%d|%-3u|", se->type, se->valid_blocks);
1099                 for (j = 0; j < SIT_VBLOCK_MAP_SIZE; j++)
1100                         seq_printf(seq, " %.2x", se->cur_valid_map[j]);
1101                 seq_putc(seq, '\n');
1102         }
1103         return 0;
1104 }
1105
1106 static int __maybe_unused victim_bits_seq_show(struct seq_file *seq,
1107                                                 void *offset)
1108 {
1109         struct super_block *sb = seq->private;
1110         struct f2fs_sb_info *sbi = F2FS_SB(sb);
1111         struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
1112         int i;
1113
1114         seq_puts(seq, "format: victim_secmap bitmaps\n");
1115
1116         for (i = 0; i < MAIN_SECS(sbi); i++) {
1117                 if ((i % 10) == 0)
1118                         seq_printf(seq, "%-10d", i);
1119                 seq_printf(seq, "%d", test_bit(i, dirty_i->victim_secmap) ? 1 : 0);
1120                 if ((i % 10) == 9 || i == (MAIN_SECS(sbi) - 1))
1121                         seq_putc(seq, '\n');
1122                 else
1123                         seq_putc(seq, ' ');
1124         }
1125         return 0;
1126 }
1127
1128 int __init f2fs_init_sysfs(void)
1129 {
1130         int ret;
1131
1132         kobject_set_name(&f2fs_kset.kobj, "f2fs");
1133         f2fs_kset.kobj.parent = fs_kobj;
1134         ret = kset_register(&f2fs_kset);
1135         if (ret)
1136                 return ret;
1137
1138         ret = kobject_init_and_add(&f2fs_feat, &f2fs_feat_ktype,
1139                                    NULL, "features");
1140         if (ret) {
1141                 kobject_put(&f2fs_feat);
1142                 kset_unregister(&f2fs_kset);
1143         } else {
1144                 f2fs_proc_root = proc_mkdir("fs/f2fs", NULL);
1145         }
1146         return ret;
1147 }
1148
1149 void f2fs_exit_sysfs(void)
1150 {
1151         kobject_put(&f2fs_feat);
1152         kset_unregister(&f2fs_kset);
1153         remove_proc_entry("fs/f2fs", NULL);
1154         f2fs_proc_root = NULL;
1155 }
1156
1157 int f2fs_register_sysfs(struct f2fs_sb_info *sbi)
1158 {
1159         struct super_block *sb = sbi->sb;
1160         int err;
1161
1162         sbi->s_kobj.kset = &f2fs_kset;
1163         init_completion(&sbi->s_kobj_unregister);
1164         err = kobject_init_and_add(&sbi->s_kobj, &f2fs_sb_ktype, NULL,
1165                                 "%s", sb->s_id);
1166         if (err)
1167                 goto put_sb_kobj;
1168
1169         sbi->s_stat_kobj.kset = &f2fs_kset;
1170         init_completion(&sbi->s_stat_kobj_unregister);
1171         err = kobject_init_and_add(&sbi->s_stat_kobj, &f2fs_stat_ktype,
1172                                                 &sbi->s_kobj, "stat");
1173         if (err)
1174                 goto put_stat_kobj;
1175
1176         sbi->s_feature_list_kobj.kset = &f2fs_kset;
1177         init_completion(&sbi->s_feature_list_kobj_unregister);
1178         err = kobject_init_and_add(&sbi->s_feature_list_kobj,
1179                                         &f2fs_feature_list_ktype,
1180                                         &sbi->s_kobj, "feature_list");
1181         if (err)
1182                 goto put_feature_list_kobj;
1183
1184         if (f2fs_proc_root)
1185                 sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);
1186
1187         if (sbi->s_proc) {
1188                 proc_create_single_data("segment_info", 0444, sbi->s_proc,
1189                                 segment_info_seq_show, sb);
1190                 proc_create_single_data("segment_bits", 0444, sbi->s_proc,
1191                                 segment_bits_seq_show, sb);
1192 #ifdef CONFIG_F2FS_IOSTAT
1193                 proc_create_single_data("iostat_info", 0444, sbi->s_proc,
1194                                 iostat_info_seq_show, sb);
1195 #endif
1196                 proc_create_single_data("victim_bits", 0444, sbi->s_proc,
1197                                 victim_bits_seq_show, sb);
1198         }
1199         return 0;
1200 put_feature_list_kobj:
1201         kobject_put(&sbi->s_feature_list_kobj);
1202         wait_for_completion(&sbi->s_feature_list_kobj_unregister);
1203 put_stat_kobj:
1204         kobject_put(&sbi->s_stat_kobj);
1205         wait_for_completion(&sbi->s_stat_kobj_unregister);
1206 put_sb_kobj:
1207         kobject_put(&sbi->s_kobj);
1208         wait_for_completion(&sbi->s_kobj_unregister);
1209         return err;
1210 }
1211
1212 void f2fs_unregister_sysfs(struct f2fs_sb_info *sbi)
1213 {
1214         if (sbi->s_proc) {
1215 #ifdef CONFIG_F2FS_IOSTAT
1216                 remove_proc_entry("iostat_info", sbi->s_proc);
1217 #endif
1218                 remove_proc_entry("segment_info", sbi->s_proc);
1219                 remove_proc_entry("segment_bits", sbi->s_proc);
1220                 remove_proc_entry("victim_bits", sbi->s_proc);
1221                 remove_proc_entry(sbi->sb->s_id, f2fs_proc_root);
1222         }
1223
1224         kobject_del(&sbi->s_stat_kobj);
1225         kobject_put(&sbi->s_stat_kobj);
1226         wait_for_completion(&sbi->s_stat_kobj_unregister);
1227         kobject_del(&sbi->s_feature_list_kobj);
1228         kobject_put(&sbi->s_feature_list_kobj);
1229         wait_for_completion(&sbi->s_feature_list_kobj_unregister);
1230
1231         kobject_del(&sbi->s_kobj);
1232         kobject_put(&sbi->s_kobj);
1233         wait_for_completion(&sbi->s_kobj_unregister);
1234 }