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 21 typedef 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 42 typedef enum { 43 ptr_explicit, 44 ptr_ext4_sb_info_offset, 45 ptr_ext4_super_block_offset, 46 } attr_ptr_t; 47 48 static const char proc_dirname[] = "fs/ext4"; 49 static struct proc_dir_entry *ext4_proc_root; 50 51 struct 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 62 static 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 return snprintf(buf, PAGE_SIZE, "%lu\n", 67 (part_stat_read(sb->s_bdev, sectors[STAT_WRITE]) - 68 sbi->s_sectors_written_start) >> 1); 69 } 70 71 static ssize_t lifetime_write_kbytes_show(struct ext4_sb_info *sbi, char *buf) 72 { 73 struct super_block *sb = sbi->s_buddy_cache->i_sb; 74 75 return snprintf(buf, PAGE_SIZE, "%llu\n", 76 (unsigned long long)(sbi->s_kbytes_written + 77 ((part_stat_read(sb->s_bdev, sectors[STAT_WRITE]) - 78 EXT4_SB(sb)->s_sectors_written_start) >> 1))); 79 } 80 81 static ssize_t inode_readahead_blks_store(struct ext4_sb_info *sbi, 82 const char *buf, size_t count) 83 { 84 unsigned long t; 85 int ret; 86 87 ret = kstrtoul(skip_spaces(buf), 0, &t); 88 if (ret) 89 return ret; 90 91 if (t && (!is_power_of_2(t) || t > 0x40000000)) 92 return -EINVAL; 93 94 sbi->s_inode_readahead_blks = t; 95 return count; 96 } 97 98 static ssize_t reserved_clusters_store(struct ext4_sb_info *sbi, 99 const char *buf, size_t count) 100 { 101 unsigned long long val; 102 ext4_fsblk_t clusters = (ext4_blocks_count(sbi->s_es) >> 103 sbi->s_cluster_bits); 104 int ret; 105 106 ret = kstrtoull(skip_spaces(buf), 0, &val); 107 if (ret || val >= clusters) 108 return -EINVAL; 109 110 atomic64_set(&sbi->s_resv_clusters, val); 111 return count; 112 } 113 114 static ssize_t trigger_test_error(struct ext4_sb_info *sbi, 115 const char *buf, size_t count) 116 { 117 int len = count; 118 119 if (!capable(CAP_SYS_ADMIN)) 120 return -EPERM; 121 122 if (len && buf[len-1] == '\n') 123 len--; 124 125 if (len) 126 ext4_error(sbi->s_sb, "%.*s", len, buf); 127 return count; 128 } 129 130 static ssize_t journal_task_show(struct ext4_sb_info *sbi, char *buf) 131 { 132 if (!sbi->s_journal) 133 return snprintf(buf, PAGE_SIZE, "<none>\n"); 134 return snprintf(buf, PAGE_SIZE, "%d\n", 135 task_pid_vnr(sbi->s_journal->j_task)); 136 } 137 138 #define EXT4_ATTR(_name,_mode,_id) \ 139 static struct ext4_attr ext4_attr_##_name = { \ 140 .attr = {.name = __stringify(_name), .mode = _mode }, \ 141 .attr_id = attr_##_id, \ 142 } 143 144 #define EXT4_ATTR_FUNC(_name,_mode) EXT4_ATTR(_name,_mode,_name) 145 146 #define EXT4_ATTR_FEATURE(_name) EXT4_ATTR(_name, 0444, feature) 147 148 #define EXT4_ATTR_OFFSET(_name,_mode,_id,_struct,_elname) \ 149 static struct ext4_attr ext4_attr_##_name = { \ 150 .attr = {.name = __stringify(_name), .mode = _mode }, \ 151 .attr_id = attr_##_id, \ 152 .attr_ptr = ptr_##_struct##_offset, \ 153 .u = { \ 154 .offset = offsetof(struct _struct, _elname),\ 155 }, \ 156 } 157 158 #define EXT4_ATTR_STRING(_name,_mode,_size,_struct,_elname) \ 159 static struct ext4_attr ext4_attr_##_name = { \ 160 .attr = {.name = __stringify(_name), .mode = _mode }, \ 161 .attr_id = attr_pointer_string, \ 162 .attr_size = _size, \ 163 .attr_ptr = ptr_##_struct##_offset, \ 164 .u = { \ 165 .offset = offsetof(struct _struct, _elname),\ 166 }, \ 167 } 168 169 #define EXT4_RO_ATTR_ES_UI(_name,_elname) \ 170 EXT4_ATTR_OFFSET(_name, 0444, pointer_ui, ext4_super_block, _elname) 171 172 #define EXT4_RO_ATTR_ES_U8(_name,_elname) \ 173 EXT4_ATTR_OFFSET(_name, 0444, pointer_u8, ext4_super_block, _elname) 174 175 #define EXT4_RO_ATTR_ES_U64(_name,_elname) \ 176 EXT4_ATTR_OFFSET(_name, 0444, pointer_u64, ext4_super_block, _elname) 177 178 #define EXT4_RO_ATTR_ES_STRING(_name,_elname,_size) \ 179 EXT4_ATTR_STRING(_name, 0444, _size, ext4_super_block, _elname) 180 181 #define EXT4_RW_ATTR_SBI_UI(_name,_elname) \ 182 EXT4_ATTR_OFFSET(_name, 0644, pointer_ui, ext4_sb_info, _elname) 183 184 #define EXT4_RW_ATTR_SBI_UL(_name,_elname) \ 185 EXT4_ATTR_OFFSET(_name, 0644, pointer_ul, ext4_sb_info, _elname) 186 187 #define EXT4_RO_ATTR_SBI_ATOMIC(_name,_elname) \ 188 EXT4_ATTR_OFFSET(_name, 0444, pointer_atomic, ext4_sb_info, _elname) 189 190 #define EXT4_ATTR_PTR(_name,_mode,_id,_ptr) \ 191 static struct ext4_attr ext4_attr_##_name = { \ 192 .attr = {.name = __stringify(_name), .mode = _mode }, \ 193 .attr_id = attr_##_id, \ 194 .attr_ptr = ptr_explicit, \ 195 .u = { \ 196 .explicit_ptr = _ptr, \ 197 }, \ 198 } 199 200 #define ATTR_LIST(name) &ext4_attr_##name.attr 201 202 EXT4_ATTR_FUNC(delayed_allocation_blocks, 0444); 203 EXT4_ATTR_FUNC(session_write_kbytes, 0444); 204 EXT4_ATTR_FUNC(lifetime_write_kbytes, 0444); 205 EXT4_ATTR_FUNC(reserved_clusters, 0644); 206 EXT4_ATTR_FUNC(sra_exceeded_retry_limit, 0444); 207 208 EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, inode_readahead, 209 ext4_sb_info, s_inode_readahead_blks); 210 EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal); 211 EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats); 212 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan); 213 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan); 214 EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs); 215 EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request); 216 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc); 217 EXT4_RW_ATTR_SBI_UI(mb_max_inode_prealloc, s_mb_max_inode_prealloc); 218 EXT4_RW_ATTR_SBI_UI(mb_max_linear_groups, s_mb_max_linear_groups); 219 EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb); 220 EXT4_ATTR(trigger_fs_error, 0200, trigger_test_error); 221 EXT4_RW_ATTR_SBI_UI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval); 222 EXT4_RW_ATTR_SBI_UI(err_ratelimit_burst, s_err_ratelimit_state.burst); 223 EXT4_RW_ATTR_SBI_UI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.interval); 224 EXT4_RW_ATTR_SBI_UI(warning_ratelimit_burst, s_warning_ratelimit_state.burst); 225 EXT4_RW_ATTR_SBI_UI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval); 226 EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst, s_msg_ratelimit_state.burst); 227 #ifdef CONFIG_EXT4_DEBUG 228 EXT4_RW_ATTR_SBI_UL(simulate_fail, s_simulate_fail); 229 #endif 230 EXT4_RO_ATTR_SBI_ATOMIC(warning_count, s_warning_count); 231 EXT4_RO_ATTR_SBI_ATOMIC(msg_count, s_msg_count); 232 EXT4_RO_ATTR_ES_UI(errors_count, s_error_count); 233 EXT4_RO_ATTR_ES_U8(first_error_errcode, s_first_error_errcode); 234 EXT4_RO_ATTR_ES_U8(last_error_errcode, s_last_error_errcode); 235 EXT4_RO_ATTR_ES_UI(first_error_ino, s_first_error_ino); 236 EXT4_RO_ATTR_ES_UI(last_error_ino, s_last_error_ino); 237 EXT4_RO_ATTR_ES_U64(first_error_block, s_first_error_block); 238 EXT4_RO_ATTR_ES_U64(last_error_block, s_last_error_block); 239 EXT4_RO_ATTR_ES_UI(first_error_line, s_first_error_line); 240 EXT4_RO_ATTR_ES_UI(last_error_line, s_last_error_line); 241 EXT4_RO_ATTR_ES_STRING(first_error_func, s_first_error_func, 32); 242 EXT4_RO_ATTR_ES_STRING(last_error_func, s_last_error_func, 32); 243 EXT4_ATTR(first_error_time, 0444, first_error_time); 244 EXT4_ATTR(last_error_time, 0444, last_error_time); 245 EXT4_ATTR(journal_task, 0444, journal_task); 246 EXT4_RW_ATTR_SBI_UI(mb_prefetch, s_mb_prefetch); 247 EXT4_RW_ATTR_SBI_UI(mb_prefetch_limit, s_mb_prefetch_limit); 248 249 static unsigned int old_bump_val = 128; 250 EXT4_ATTR_PTR(max_writeback_mb_bump, 0444, pointer_ui, &old_bump_val); 251 252 static struct attribute *ext4_attrs[] = { 253 ATTR_LIST(delayed_allocation_blocks), 254 ATTR_LIST(session_write_kbytes), 255 ATTR_LIST(lifetime_write_kbytes), 256 ATTR_LIST(reserved_clusters), 257 ATTR_LIST(sra_exceeded_retry_limit), 258 ATTR_LIST(inode_readahead_blks), 259 ATTR_LIST(inode_goal), 260 ATTR_LIST(mb_stats), 261 ATTR_LIST(mb_max_to_scan), 262 ATTR_LIST(mb_min_to_scan), 263 ATTR_LIST(mb_order2_req), 264 ATTR_LIST(mb_stream_req), 265 ATTR_LIST(mb_group_prealloc), 266 ATTR_LIST(mb_max_inode_prealloc), 267 ATTR_LIST(mb_max_linear_groups), 268 ATTR_LIST(max_writeback_mb_bump), 269 ATTR_LIST(extent_max_zeroout_kb), 270 ATTR_LIST(trigger_fs_error), 271 ATTR_LIST(err_ratelimit_interval_ms), 272 ATTR_LIST(err_ratelimit_burst), 273 ATTR_LIST(warning_ratelimit_interval_ms), 274 ATTR_LIST(warning_ratelimit_burst), 275 ATTR_LIST(msg_ratelimit_interval_ms), 276 ATTR_LIST(msg_ratelimit_burst), 277 ATTR_LIST(errors_count), 278 ATTR_LIST(warning_count), 279 ATTR_LIST(msg_count), 280 ATTR_LIST(first_error_ino), 281 ATTR_LIST(last_error_ino), 282 ATTR_LIST(first_error_block), 283 ATTR_LIST(last_error_block), 284 ATTR_LIST(first_error_line), 285 ATTR_LIST(last_error_line), 286 ATTR_LIST(first_error_func), 287 ATTR_LIST(last_error_func), 288 ATTR_LIST(first_error_errcode), 289 ATTR_LIST(last_error_errcode), 290 ATTR_LIST(first_error_time), 291 ATTR_LIST(last_error_time), 292 ATTR_LIST(journal_task), 293 #ifdef CONFIG_EXT4_DEBUG 294 ATTR_LIST(simulate_fail), 295 #endif 296 ATTR_LIST(mb_prefetch), 297 ATTR_LIST(mb_prefetch_limit), 298 NULL, 299 }; 300 ATTRIBUTE_GROUPS(ext4); 301 302 /* Features this copy of ext4 supports */ 303 EXT4_ATTR_FEATURE(lazy_itable_init); 304 EXT4_ATTR_FEATURE(batched_discard); 305 EXT4_ATTR_FEATURE(meta_bg_resize); 306 #ifdef CONFIG_FS_ENCRYPTION 307 EXT4_ATTR_FEATURE(encryption); 308 EXT4_ATTR_FEATURE(test_dummy_encryption_v2); 309 #endif 310 #ifdef CONFIG_UNICODE 311 EXT4_ATTR_FEATURE(casefold); 312 #endif 313 #ifdef CONFIG_FS_VERITY 314 EXT4_ATTR_FEATURE(verity); 315 #endif 316 EXT4_ATTR_FEATURE(metadata_csum_seed); 317 EXT4_ATTR_FEATURE(fast_commit); 318 #if defined(CONFIG_UNICODE) && defined(CONFIG_FS_ENCRYPTION) 319 EXT4_ATTR_FEATURE(encrypted_casefold); 320 #endif 321 322 static struct attribute *ext4_feat_attrs[] = { 323 ATTR_LIST(lazy_itable_init), 324 ATTR_LIST(batched_discard), 325 ATTR_LIST(meta_bg_resize), 326 #ifdef CONFIG_FS_ENCRYPTION 327 ATTR_LIST(encryption), 328 ATTR_LIST(test_dummy_encryption_v2), 329 #endif 330 #ifdef CONFIG_UNICODE 331 ATTR_LIST(casefold), 332 #endif 333 #ifdef CONFIG_FS_VERITY 334 ATTR_LIST(verity), 335 #endif 336 ATTR_LIST(metadata_csum_seed), 337 ATTR_LIST(fast_commit), 338 #if defined(CONFIG_UNICODE) && defined(CONFIG_FS_ENCRYPTION) 339 ATTR_LIST(encrypted_casefold), 340 #endif 341 NULL, 342 }; 343 ATTRIBUTE_GROUPS(ext4_feat); 344 345 static void *calc_ptr(struct ext4_attr *a, struct ext4_sb_info *sbi) 346 { 347 switch (a->attr_ptr) { 348 case ptr_explicit: 349 return a->u.explicit_ptr; 350 case ptr_ext4_sb_info_offset: 351 return (void *) (((char *) sbi) + a->u.offset); 352 case ptr_ext4_super_block_offset: 353 return (void *) (((char *) sbi->s_es) + a->u.offset); 354 } 355 return NULL; 356 } 357 358 static ssize_t __print_tstamp(char *buf, __le32 lo, __u8 hi) 359 { 360 return snprintf(buf, PAGE_SIZE, "%lld\n", 361 ((time64_t)hi << 32) + le32_to_cpu(lo)); 362 } 363 364 #define print_tstamp(buf, es, tstamp) \ 365 __print_tstamp(buf, (es)->tstamp, (es)->tstamp ## _hi) 366 367 static ssize_t ext4_attr_show(struct kobject *kobj, 368 struct attribute *attr, char *buf) 369 { 370 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, 371 s_kobj); 372 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr); 373 void *ptr = calc_ptr(a, sbi); 374 375 switch (a->attr_id) { 376 case attr_delayed_allocation_blocks: 377 return snprintf(buf, PAGE_SIZE, "%llu\n", 378 (s64) EXT4_C2B(sbi, 379 percpu_counter_sum(&sbi->s_dirtyclusters_counter))); 380 case attr_session_write_kbytes: 381 return session_write_kbytes_show(sbi, buf); 382 case attr_lifetime_write_kbytes: 383 return lifetime_write_kbytes_show(sbi, buf); 384 case attr_reserved_clusters: 385 return snprintf(buf, PAGE_SIZE, "%llu\n", 386 (unsigned long long) 387 atomic64_read(&sbi->s_resv_clusters)); 388 case attr_sra_exceeded_retry_limit: 389 return snprintf(buf, PAGE_SIZE, "%llu\n", 390 (unsigned long long) 391 percpu_counter_sum(&sbi->s_sra_exceeded_retry_limit)); 392 case attr_inode_readahead: 393 case attr_pointer_ui: 394 if (!ptr) 395 return 0; 396 if (a->attr_ptr == ptr_ext4_super_block_offset) 397 return snprintf(buf, PAGE_SIZE, "%u\n", 398 le32_to_cpup(ptr)); 399 else 400 return snprintf(buf, PAGE_SIZE, "%u\n", 401 *((unsigned int *) ptr)); 402 case attr_pointer_ul: 403 if (!ptr) 404 return 0; 405 return snprintf(buf, PAGE_SIZE, "%lu\n", 406 *((unsigned long *) ptr)); 407 case attr_pointer_u8: 408 if (!ptr) 409 return 0; 410 return snprintf(buf, PAGE_SIZE, "%u\n", 411 *((unsigned char *) ptr)); 412 case attr_pointer_u64: 413 if (!ptr) 414 return 0; 415 if (a->attr_ptr == ptr_ext4_super_block_offset) 416 return snprintf(buf, PAGE_SIZE, "%llu\n", 417 le64_to_cpup(ptr)); 418 else 419 return snprintf(buf, PAGE_SIZE, "%llu\n", 420 *((unsigned long long *) ptr)); 421 case attr_pointer_string: 422 if (!ptr) 423 return 0; 424 return snprintf(buf, PAGE_SIZE, "%.*s\n", a->attr_size, 425 (char *) ptr); 426 case attr_pointer_atomic: 427 if (!ptr) 428 return 0; 429 return snprintf(buf, PAGE_SIZE, "%d\n", 430 atomic_read((atomic_t *) ptr)); 431 case attr_feature: 432 return snprintf(buf, PAGE_SIZE, "supported\n"); 433 case attr_first_error_time: 434 return print_tstamp(buf, sbi->s_es, s_first_error_time); 435 case attr_last_error_time: 436 return print_tstamp(buf, sbi->s_es, s_last_error_time); 437 case attr_journal_task: 438 return journal_task_show(sbi, buf); 439 } 440 441 return 0; 442 } 443 444 static ssize_t ext4_attr_store(struct kobject *kobj, 445 struct attribute *attr, 446 const char *buf, size_t len) 447 { 448 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, 449 s_kobj); 450 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr); 451 void *ptr = calc_ptr(a, sbi); 452 unsigned long t; 453 int ret; 454 455 switch (a->attr_id) { 456 case attr_reserved_clusters: 457 return reserved_clusters_store(sbi, buf, len); 458 case attr_pointer_ui: 459 if (!ptr) 460 return 0; 461 ret = kstrtoul(skip_spaces(buf), 0, &t); 462 if (ret) 463 return ret; 464 if (a->attr_ptr == ptr_ext4_super_block_offset) 465 *((__le32 *) ptr) = cpu_to_le32(t); 466 else 467 *((unsigned int *) ptr) = t; 468 return len; 469 case attr_pointer_ul: 470 if (!ptr) 471 return 0; 472 ret = kstrtoul(skip_spaces(buf), 0, &t); 473 if (ret) 474 return ret; 475 *((unsigned long *) ptr) = t; 476 return len; 477 case attr_inode_readahead: 478 return inode_readahead_blks_store(sbi, buf, len); 479 case attr_trigger_test_error: 480 return trigger_test_error(sbi, buf, len); 481 } 482 return 0; 483 } 484 485 static void ext4_sb_release(struct kobject *kobj) 486 { 487 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, 488 s_kobj); 489 complete(&sbi->s_kobj_unregister); 490 } 491 492 static const struct sysfs_ops ext4_attr_ops = { 493 .show = ext4_attr_show, 494 .store = ext4_attr_store, 495 }; 496 497 static struct kobj_type ext4_sb_ktype = { 498 .default_groups = ext4_groups, 499 .sysfs_ops = &ext4_attr_ops, 500 .release = ext4_sb_release, 501 }; 502 503 static struct kobj_type ext4_feat_ktype = { 504 .default_groups = ext4_feat_groups, 505 .sysfs_ops = &ext4_attr_ops, 506 .release = (void (*)(struct kobject *))kfree, 507 }; 508 509 void ext4_notify_error_sysfs(struct ext4_sb_info *sbi) 510 { 511 sysfs_notify(&sbi->s_kobj, NULL, "errors_count"); 512 } 513 514 static struct kobject *ext4_root; 515 516 static struct kobject *ext4_feat; 517 518 int ext4_register_sysfs(struct super_block *sb) 519 { 520 struct ext4_sb_info *sbi = EXT4_SB(sb); 521 int err; 522 523 init_completion(&sbi->s_kobj_unregister); 524 err = kobject_init_and_add(&sbi->s_kobj, &ext4_sb_ktype, ext4_root, 525 "%s", sb->s_id); 526 if (err) { 527 kobject_put(&sbi->s_kobj); 528 wait_for_completion(&sbi->s_kobj_unregister); 529 return err; 530 } 531 532 if (ext4_proc_root) 533 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root); 534 if (sbi->s_proc) { 535 proc_create_single_data("options", S_IRUGO, sbi->s_proc, 536 ext4_seq_options_show, sb); 537 proc_create_single_data("es_shrinker_info", S_IRUGO, 538 sbi->s_proc, ext4_seq_es_shrinker_info_show, 539 sb); 540 proc_create_single_data("fc_info", 0444, sbi->s_proc, 541 ext4_fc_info_show, sb); 542 proc_create_seq_data("mb_groups", S_IRUGO, sbi->s_proc, 543 &ext4_mb_seq_groups_ops, sb); 544 proc_create_single_data("mb_stats", 0444, sbi->s_proc, 545 ext4_seq_mb_stats_show, sb); 546 proc_create_seq_data("mb_structs_summary", 0444, sbi->s_proc, 547 &ext4_mb_seq_structs_summary_ops, sb); 548 } 549 return 0; 550 } 551 552 void ext4_unregister_sysfs(struct super_block *sb) 553 { 554 struct ext4_sb_info *sbi = EXT4_SB(sb); 555 556 if (sbi->s_proc) 557 remove_proc_subtree(sb->s_id, ext4_proc_root); 558 kobject_del(&sbi->s_kobj); 559 } 560 561 int __init ext4_init_sysfs(void) 562 { 563 int ret; 564 565 ext4_root = kobject_create_and_add("ext4", fs_kobj); 566 if (!ext4_root) 567 return -ENOMEM; 568 569 ext4_feat = kzalloc(sizeof(*ext4_feat), GFP_KERNEL); 570 if (!ext4_feat) { 571 ret = -ENOMEM; 572 goto root_err; 573 } 574 575 ret = kobject_init_and_add(ext4_feat, &ext4_feat_ktype, 576 ext4_root, "features"); 577 if (ret) 578 goto feat_err; 579 580 ext4_proc_root = proc_mkdir(proc_dirname, NULL); 581 return ret; 582 583 feat_err: 584 kobject_put(ext4_feat); 585 ext4_feat = NULL; 586 root_err: 587 kobject_put(ext4_root); 588 ext4_root = NULL; 589 return ret; 590 } 591 592 void ext4_exit_sysfs(void) 593 { 594 kobject_put(ext4_feat); 595 ext4_feat = NULL; 596 kobject_put(ext4_root); 597 ext4_root = NULL; 598 remove_proc_entry(proc_dirname, NULL); 599 ext4_proc_root = NULL; 600 } 601 602