1// SPDX-License-Identifier: GPL-2.0 2/* 3 * linux/fs/ext4/sysfs.c 4 * 5 * Copyright (C) 1992, 1993, 1994, 1995 6 * Remy Card (card@masi.ibp.fr) 7 * Theodore Ts'o (tytso@mit.edu) 8 * 9 */ 10 11#include <linux/time.h> 12#include <linux/fs.h> 13#include <linux/seq_file.h> 14#include <linux/slab.h> 15#include <linux/proc_fs.h> 16#include <linux/part_stat.h> 17 18#include "ext4.h" 19#include "ext4_jbd2.h" 20 21typedef enum { 22 attr_noop, 23 attr_delayed_allocation_blocks, 24 attr_session_write_kbytes, 25 attr_lifetime_write_kbytes, 26 attr_reserved_clusters, 27 attr_sra_exceeded_retry_limit, 28 attr_inode_readahead, 29 attr_trigger_test_error, 30 attr_first_error_time, 31 attr_last_error_time, 32 attr_feature, 33 attr_pointer_ui, 34 attr_pointer_ul, 35 attr_pointer_u64, 36 attr_pointer_u8, 37 attr_pointer_string, 38 attr_pointer_atomic, 39 attr_journal_task, 40} attr_id_t; 41 42typedef enum { 43 ptr_explicit, 44 ptr_ext4_sb_info_offset, 45 ptr_ext4_super_block_offset, 46} attr_ptr_t; 47 48static const char proc_dirname[] = "fs/ext4"; 49static struct proc_dir_entry *ext4_proc_root; 50 51struct ext4_attr { 52 struct attribute attr; 53 short attr_id; 54 short attr_ptr; 55 unsigned short attr_size; 56 union { 57 int offset; 58 void *explicit_ptr; 59 } u; 60}; 61 62static ssize_t session_write_kbytes_show(struct ext4_sb_info *sbi, char *buf) 63{ 64 struct super_block *sb = sbi->s_buddy_cache->i_sb; 65 66 if (!sb->s_bdev->bd_part) 67 return snprintf(buf, PAGE_SIZE, "0\n"); 68 return snprintf(buf, PAGE_SIZE, "%lu\n", 69 (part_stat_read(sb->s_bdev->bd_part, 70 sectors[STAT_WRITE]) - 71 sbi->s_sectors_written_start) >> 1); 72} 73 74static ssize_t lifetime_write_kbytes_show(struct ext4_sb_info *sbi, char *buf) 75{ 76 struct super_block *sb = sbi->s_buddy_cache->i_sb; 77 78 if (!sb->s_bdev->bd_part) 79 return snprintf(buf, PAGE_SIZE, "0\n"); 80 return snprintf(buf, PAGE_SIZE, "%llu\n", 81 (unsigned long long)(sbi->s_kbytes_written + 82 ((part_stat_read(sb->s_bdev->bd_part, 83 sectors[STAT_WRITE]) - 84 EXT4_SB(sb)->s_sectors_written_start) >> 1))); 85} 86 87static ssize_t inode_readahead_blks_store(struct ext4_sb_info *sbi, 88 const char *buf, size_t count) 89{ 90 unsigned long t; 91 int ret; 92 93 ret = kstrtoul(skip_spaces(buf), 0, &t); 94 if (ret) 95 return ret; 96 97 if (t && (!is_power_of_2(t) || t > 0x40000000)) 98 return -EINVAL; 99 100 sbi->s_inode_readahead_blks = t; 101 return count; 102} 103 104static ssize_t reserved_clusters_store(struct ext4_sb_info *sbi, 105 const char *buf, size_t count) 106{ 107 unsigned long long val; 108 ext4_fsblk_t clusters = (ext4_blocks_count(sbi->s_es) >> 109 sbi->s_cluster_bits); 110 int ret; 111 112 ret = kstrtoull(skip_spaces(buf), 0, &val); 113 if (ret || val >= clusters) 114 return -EINVAL; 115 116 atomic64_set(&sbi->s_resv_clusters, val); 117 return count; 118} 119 120static ssize_t trigger_test_error(struct ext4_sb_info *sbi, 121 const char *buf, size_t count) 122{ 123 int len = count; 124 125 if (!capable(CAP_SYS_ADMIN)) 126 return -EPERM; 127 128 if (len && buf[len-1] == '\n') 129 len--; 130 131 if (len) 132 ext4_error(sbi->s_sb, "%.*s", len, buf); 133 return count; 134} 135 136static ssize_t journal_task_show(struct ext4_sb_info *sbi, char *buf) 137{ 138 if (!sbi->s_journal) 139 return snprintf(buf, PAGE_SIZE, "<none>\n"); 140 return snprintf(buf, PAGE_SIZE, "%d\n", 141 task_pid_vnr(sbi->s_journal->j_task)); 142} 143 144#define EXT4_ATTR(_name,_mode,_id) \ 145static struct ext4_attr ext4_attr_##_name = { \ 146 .attr = {.name = __stringify(_name), .mode = _mode }, \ 147 .attr_id = attr_##_id, \ 148} 149 150#define EXT4_ATTR_FUNC(_name,_mode) EXT4_ATTR(_name,_mode,_name) 151 152#define EXT4_ATTR_FEATURE(_name) EXT4_ATTR(_name, 0444, feature) 153 154#define EXT4_ATTR_OFFSET(_name,_mode,_id,_struct,_elname) \ 155static struct ext4_attr ext4_attr_##_name = { \ 156 .attr = {.name = __stringify(_name), .mode = _mode }, \ 157 .attr_id = attr_##_id, \ 158 .attr_ptr = ptr_##_struct##_offset, \ 159 .u = { \ 160 .offset = offsetof(struct _struct, _elname),\ 161 }, \ 162} 163 164#define EXT4_ATTR_STRING(_name,_mode,_size,_struct,_elname) \ 165static struct ext4_attr ext4_attr_##_name = { \ 166 .attr = {.name = __stringify(_name), .mode = _mode }, \ 167 .attr_id = attr_pointer_string, \ 168 .attr_size = _size, \ 169 .attr_ptr = ptr_##_struct##_offset, \ 170 .u = { \ 171 .offset = offsetof(struct _struct, _elname),\ 172 }, \ 173} 174 175#define EXT4_RO_ATTR_ES_UI(_name,_elname) \ 176 EXT4_ATTR_OFFSET(_name, 0444, pointer_ui, ext4_super_block, _elname) 177 178#define EXT4_RO_ATTR_ES_U8(_name,_elname) \ 179 EXT4_ATTR_OFFSET(_name, 0444, pointer_u8, ext4_super_block, _elname) 180 181#define EXT4_RO_ATTR_ES_U64(_name,_elname) \ 182 EXT4_ATTR_OFFSET(_name, 0444, pointer_u64, ext4_super_block, _elname) 183 184#define EXT4_RO_ATTR_ES_STRING(_name,_elname,_size) \ 185 EXT4_ATTR_STRING(_name, 0444, _size, ext4_super_block, _elname) 186 187#define EXT4_RW_ATTR_SBI_UI(_name,_elname) \ 188 EXT4_ATTR_OFFSET(_name, 0644, pointer_ui, ext4_sb_info, _elname) 189 190#define EXT4_RW_ATTR_SBI_UL(_name,_elname) \ 191 EXT4_ATTR_OFFSET(_name, 0644, pointer_ul, ext4_sb_info, _elname) 192 193#define EXT4_RO_ATTR_SBI_ATOMIC(_name,_elname) \ 194 EXT4_ATTR_OFFSET(_name, 0444, pointer_atomic, ext4_sb_info, _elname) 195 196#define EXT4_ATTR_PTR(_name,_mode,_id,_ptr) \ 197static struct ext4_attr ext4_attr_##_name = { \ 198 .attr = {.name = __stringify(_name), .mode = _mode }, \ 199 .attr_id = attr_##_id, \ 200 .attr_ptr = ptr_explicit, \ 201 .u = { \ 202 .explicit_ptr = _ptr, \ 203 }, \ 204} 205 206#define ATTR_LIST(name) &ext4_attr_##name.attr 207 208EXT4_ATTR_FUNC(delayed_allocation_blocks, 0444); 209EXT4_ATTR_FUNC(session_write_kbytes, 0444); 210EXT4_ATTR_FUNC(lifetime_write_kbytes, 0444); 211EXT4_ATTR_FUNC(reserved_clusters, 0644); 212EXT4_ATTR_FUNC(sra_exceeded_retry_limit, 0444); 213 214EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, inode_readahead, 215 ext4_sb_info, s_inode_readahead_blks); 216EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal); 217EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats); 218EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan); 219EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan); 220EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs); 221EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request); 222EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc); 223EXT4_RW_ATTR_SBI_UI(mb_max_inode_prealloc, s_mb_max_inode_prealloc); 224EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb); 225EXT4_ATTR(trigger_fs_error, 0200, trigger_test_error); 226EXT4_RW_ATTR_SBI_UI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval); 227EXT4_RW_ATTR_SBI_UI(err_ratelimit_burst, s_err_ratelimit_state.burst); 228EXT4_RW_ATTR_SBI_UI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.interval); 229EXT4_RW_ATTR_SBI_UI(warning_ratelimit_burst, s_warning_ratelimit_state.burst); 230EXT4_RW_ATTR_SBI_UI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval); 231EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst, s_msg_ratelimit_state.burst); 232#ifdef CONFIG_EXT4_DEBUG 233EXT4_RW_ATTR_SBI_UL(simulate_fail, s_simulate_fail); 234#endif 235EXT4_RO_ATTR_SBI_ATOMIC(warning_count, s_warning_count); 236EXT4_RO_ATTR_SBI_ATOMIC(msg_count, s_msg_count); 237EXT4_RO_ATTR_ES_UI(errors_count, s_error_count); 238EXT4_RO_ATTR_ES_U8(first_error_errcode, s_first_error_errcode); 239EXT4_RO_ATTR_ES_U8(last_error_errcode, s_last_error_errcode); 240EXT4_RO_ATTR_ES_UI(first_error_ino, s_first_error_ino); 241EXT4_RO_ATTR_ES_UI(last_error_ino, s_last_error_ino); 242EXT4_RO_ATTR_ES_U64(first_error_block, s_first_error_block); 243EXT4_RO_ATTR_ES_U64(last_error_block, s_last_error_block); 244EXT4_RO_ATTR_ES_UI(first_error_line, s_first_error_line); 245EXT4_RO_ATTR_ES_UI(last_error_line, s_last_error_line); 246EXT4_RO_ATTR_ES_STRING(first_error_func, s_first_error_func, 32); 247EXT4_RO_ATTR_ES_STRING(last_error_func, s_last_error_func, 32); 248EXT4_ATTR(first_error_time, 0444, first_error_time); 249EXT4_ATTR(last_error_time, 0444, last_error_time); 250EXT4_ATTR(journal_task, 0444, journal_task); 251EXT4_RW_ATTR_SBI_UI(mb_prefetch, s_mb_prefetch); 252EXT4_RW_ATTR_SBI_UI(mb_prefetch_limit, s_mb_prefetch_limit); 253 254static unsigned int old_bump_val = 128; 255EXT4_ATTR_PTR(max_writeback_mb_bump, 0444, pointer_ui, &old_bump_val); 256 257static struct attribute *ext4_attrs[] = { 258 ATTR_LIST(delayed_allocation_blocks), 259 ATTR_LIST(session_write_kbytes), 260 ATTR_LIST(lifetime_write_kbytes), 261 ATTR_LIST(reserved_clusters), 262 ATTR_LIST(sra_exceeded_retry_limit), 263 ATTR_LIST(inode_readahead_blks), 264 ATTR_LIST(inode_goal), 265 ATTR_LIST(mb_stats), 266 ATTR_LIST(mb_max_to_scan), 267 ATTR_LIST(mb_min_to_scan), 268 ATTR_LIST(mb_order2_req), 269 ATTR_LIST(mb_stream_req), 270 ATTR_LIST(mb_group_prealloc), 271 ATTR_LIST(mb_max_inode_prealloc), 272 ATTR_LIST(max_writeback_mb_bump), 273 ATTR_LIST(extent_max_zeroout_kb), 274 ATTR_LIST(trigger_fs_error), 275 ATTR_LIST(err_ratelimit_interval_ms), 276 ATTR_LIST(err_ratelimit_burst), 277 ATTR_LIST(warning_ratelimit_interval_ms), 278 ATTR_LIST(warning_ratelimit_burst), 279 ATTR_LIST(msg_ratelimit_interval_ms), 280 ATTR_LIST(msg_ratelimit_burst), 281 ATTR_LIST(errors_count), 282 ATTR_LIST(warning_count), 283 ATTR_LIST(msg_count), 284 ATTR_LIST(first_error_ino), 285 ATTR_LIST(last_error_ino), 286 ATTR_LIST(first_error_block), 287 ATTR_LIST(last_error_block), 288 ATTR_LIST(first_error_line), 289 ATTR_LIST(last_error_line), 290 ATTR_LIST(first_error_func), 291 ATTR_LIST(last_error_func), 292 ATTR_LIST(first_error_errcode), 293 ATTR_LIST(last_error_errcode), 294 ATTR_LIST(first_error_time), 295 ATTR_LIST(last_error_time), 296 ATTR_LIST(journal_task), 297#ifdef CONFIG_EXT4_DEBUG 298 ATTR_LIST(simulate_fail), 299#endif 300 ATTR_LIST(mb_prefetch), 301 ATTR_LIST(mb_prefetch_limit), 302 NULL, 303}; 304ATTRIBUTE_GROUPS(ext4); 305 306/* Features this copy of ext4 supports */ 307EXT4_ATTR_FEATURE(lazy_itable_init); 308EXT4_ATTR_FEATURE(batched_discard); 309EXT4_ATTR_FEATURE(meta_bg_resize); 310#ifdef CONFIG_FS_ENCRYPTION 311EXT4_ATTR_FEATURE(encryption); 312EXT4_ATTR_FEATURE(test_dummy_encryption_v2); 313#endif 314#ifdef CONFIG_UNICODE 315EXT4_ATTR_FEATURE(casefold); 316#endif 317#ifdef CONFIG_FS_VERITY 318EXT4_ATTR_FEATURE(verity); 319#endif 320EXT4_ATTR_FEATURE(metadata_csum_seed); 321EXT4_ATTR_FEATURE(fast_commit); 322 323static struct attribute *ext4_feat_attrs[] = { 324 ATTR_LIST(lazy_itable_init), 325 ATTR_LIST(batched_discard), 326 ATTR_LIST(meta_bg_resize), 327#ifdef CONFIG_FS_ENCRYPTION 328 ATTR_LIST(encryption), 329 ATTR_LIST(test_dummy_encryption_v2), 330#endif 331#ifdef CONFIG_UNICODE 332 ATTR_LIST(casefold), 333#endif 334#ifdef CONFIG_FS_VERITY 335 ATTR_LIST(verity), 336#endif 337 ATTR_LIST(metadata_csum_seed), 338 ATTR_LIST(fast_commit), 339 NULL, 340}; 341ATTRIBUTE_GROUPS(ext4_feat); 342 343static void *calc_ptr(struct ext4_attr *a, struct ext4_sb_info *sbi) 344{ 345 switch (a->attr_ptr) { 346 case ptr_explicit: 347 return a->u.explicit_ptr; 348 case ptr_ext4_sb_info_offset: 349 return (void *) (((char *) sbi) + a->u.offset); 350 case ptr_ext4_super_block_offset: 351 return (void *) (((char *) sbi->s_es) + a->u.offset); 352 } 353 return NULL; 354} 355 356static ssize_t __print_tstamp(char *buf, __le32 lo, __u8 hi) 357{ 358 return snprintf(buf, PAGE_SIZE, "%lld\n", 359 ((time64_t)hi << 32) + le32_to_cpu(lo)); 360} 361 362#define print_tstamp(buf, es, tstamp) \ 363 __print_tstamp(buf, (es)->tstamp, (es)->tstamp ## _hi) 364 365static ssize_t ext4_attr_show(struct kobject *kobj, 366 struct attribute *attr, char *buf) 367{ 368 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, 369 s_kobj); 370 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr); 371 void *ptr = calc_ptr(a, sbi); 372 373 switch (a->attr_id) { 374 case attr_delayed_allocation_blocks: 375 return snprintf(buf, PAGE_SIZE, "%llu\n", 376 (s64) EXT4_C2B(sbi, 377 percpu_counter_sum(&sbi->s_dirtyclusters_counter))); 378 case attr_session_write_kbytes: 379 return session_write_kbytes_show(sbi, buf); 380 case attr_lifetime_write_kbytes: 381 return lifetime_write_kbytes_show(sbi, buf); 382 case attr_reserved_clusters: 383 return snprintf(buf, PAGE_SIZE, "%llu\n", 384 (unsigned long long) 385 atomic64_read(&sbi->s_resv_clusters)); 386 case attr_sra_exceeded_retry_limit: 387 return snprintf(buf, PAGE_SIZE, "%llu\n", 388 (unsigned long long) 389 percpu_counter_sum(&sbi->s_sra_exceeded_retry_limit)); 390 case attr_inode_readahead: 391 case attr_pointer_ui: 392 if (!ptr) 393 return 0; 394 if (a->attr_ptr == ptr_ext4_super_block_offset) 395 return snprintf(buf, PAGE_SIZE, "%u\n", 396 le32_to_cpup(ptr)); 397 else 398 return snprintf(buf, PAGE_SIZE, "%u\n", 399 *((unsigned int *) ptr)); 400 case attr_pointer_ul: 401 if (!ptr) 402 return 0; 403 return snprintf(buf, PAGE_SIZE, "%lu\n", 404 *((unsigned long *) ptr)); 405 case attr_pointer_u8: 406 if (!ptr) 407 return 0; 408 return snprintf(buf, PAGE_SIZE, "%u\n", 409 *((unsigned char *) ptr)); 410 case attr_pointer_u64: 411 if (!ptr) 412 return 0; 413 if (a->attr_ptr == ptr_ext4_super_block_offset) 414 return snprintf(buf, PAGE_SIZE, "%llu\n", 415 le64_to_cpup(ptr)); 416 else 417 return snprintf(buf, PAGE_SIZE, "%llu\n", 418 *((unsigned long long *) ptr)); 419 case attr_pointer_string: 420 if (!ptr) 421 return 0; 422 return snprintf(buf, PAGE_SIZE, "%.*s\n", a->attr_size, 423 (char *) ptr); 424 case attr_pointer_atomic: 425 if (!ptr) 426 return 0; 427 return snprintf(buf, PAGE_SIZE, "%d\n", 428 atomic_read((atomic_t *) ptr)); 429 case attr_feature: 430 return snprintf(buf, PAGE_SIZE, "supported\n"); 431 case attr_first_error_time: 432 return print_tstamp(buf, sbi->s_es, s_first_error_time); 433 case attr_last_error_time: 434 return print_tstamp(buf, sbi->s_es, s_last_error_time); 435 case attr_journal_task: 436 return journal_task_show(sbi, buf); 437 } 438 439 return 0; 440} 441 442static ssize_t ext4_attr_store(struct kobject *kobj, 443 struct attribute *attr, 444 const char *buf, size_t len) 445{ 446 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, 447 s_kobj); 448 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr); 449 void *ptr = calc_ptr(a, sbi); 450 unsigned long t; 451 int ret; 452 453 switch (a->attr_id) { 454 case attr_reserved_clusters: 455 return reserved_clusters_store(sbi, buf, len); 456 case attr_pointer_ui: 457 if (!ptr) 458 return 0; 459 ret = kstrtoul(skip_spaces(buf), 0, &t); 460 if (ret) 461 return ret; 462 if (a->attr_ptr == ptr_ext4_super_block_offset) 463 *((__le32 *) ptr) = cpu_to_le32(t); 464 else 465 *((unsigned int *) ptr) = t; 466 return len; 467 case attr_pointer_ul: 468 if (!ptr) 469 return 0; 470 ret = kstrtoul(skip_spaces(buf), 0, &t); 471 if (ret) 472 return ret; 473 *((unsigned long *) ptr) = t; 474 return len; 475 case attr_inode_readahead: 476 return inode_readahead_blks_store(sbi, buf, len); 477 case attr_trigger_test_error: 478 return trigger_test_error(sbi, buf, len); 479 } 480 return 0; 481} 482 483static void ext4_sb_release(struct kobject *kobj) 484{ 485 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, 486 s_kobj); 487 complete(&sbi->s_kobj_unregister); 488} 489 490static void ext4_feat_release(struct kobject *kobj) 491{ 492 kfree(kobj); 493} 494 495static const struct sysfs_ops ext4_attr_ops = { 496 .show = ext4_attr_show, 497 .store = ext4_attr_store, 498}; 499 500static struct kobj_type ext4_sb_ktype = { 501 .default_groups = ext4_groups, 502 .sysfs_ops = &ext4_attr_ops, 503 .release = ext4_sb_release, 504}; 505 506static struct kobj_type ext4_feat_ktype = { 507 .default_groups = ext4_feat_groups, 508 .sysfs_ops = &ext4_attr_ops, 509 .release = ext4_feat_release, 510}; 511 512static struct kobject *ext4_root; 513 514static struct kobject *ext4_feat; 515 516int ext4_register_sysfs(struct super_block *sb) 517{ 518 struct ext4_sb_info *sbi = EXT4_SB(sb); 519 int err; 520 521 init_completion(&sbi->s_kobj_unregister); 522 err = kobject_init_and_add(&sbi->s_kobj, &ext4_sb_ktype, ext4_root, 523 "%s", sb->s_id); 524 if (err) { 525 kobject_put(&sbi->s_kobj); 526 wait_for_completion(&sbi->s_kobj_unregister); 527 return err; 528 } 529 530 if (ext4_proc_root) 531 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root); 532 if (sbi->s_proc) { 533 proc_create_single_data("options", S_IRUGO, sbi->s_proc, 534 ext4_seq_options_show, sb); 535 proc_create_single_data("es_shrinker_info", S_IRUGO, 536 sbi->s_proc, ext4_seq_es_shrinker_info_show, 537 sb); 538 proc_create_single_data("fc_info", 0444, sbi->s_proc, 539 ext4_fc_info_show, sb); 540 proc_create_seq_data("mb_groups", S_IRUGO, sbi->s_proc, 541 &ext4_mb_seq_groups_ops, sb); 542 proc_create_single_data("mb_stats", 0444, sbi->s_proc, 543 ext4_seq_mb_stats_show, sb); 544 } 545 return 0; 546} 547 548void ext4_unregister_sysfs(struct super_block *sb) 549{ 550 struct ext4_sb_info *sbi = EXT4_SB(sb); 551 552 if (sbi->s_proc) 553 remove_proc_subtree(sb->s_id, ext4_proc_root); 554 kobject_del(&sbi->s_kobj); 555} 556 557int __init ext4_init_sysfs(void) 558{ 559 int ret; 560 561 ext4_root = kobject_create_and_add("ext4", fs_kobj); 562 if (!ext4_root) 563 return -ENOMEM; 564 565 ext4_feat = kzalloc(sizeof(*ext4_feat), GFP_KERNEL); 566 if (!ext4_feat) { 567 ret = -ENOMEM; 568 goto root_err; 569 } 570 571 ret = kobject_init_and_add(ext4_feat, &ext4_feat_ktype, 572 ext4_root, "features"); 573 if (ret) 574 goto feat_err; 575 576 ext4_proc_root = proc_mkdir(proc_dirname, NULL); 577 return ret; 578 579feat_err: 580 kobject_put(ext4_feat); 581 ext4_feat = NULL; 582root_err: 583 kobject_put(ext4_root); 584 ext4_root = NULL; 585 return ret; 586} 587 588void ext4_exit_sysfs(void) 589{ 590 kobject_put(ext4_feat); 591 ext4_feat = NULL; 592 kobject_put(ext4_root); 593 ext4_root = NULL; 594 remove_proc_entry(proc_dirname, NULL); 595 ext4_proc_root = NULL; 596} 597 598