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_clusters_in_group, 33 attr_mb_order, 34 attr_feature, 35 attr_pointer_pi, 36 attr_pointer_ui, 37 attr_pointer_ul, 38 attr_pointer_u64, 39 attr_pointer_u8, 40 attr_pointer_string, 41 attr_pointer_atomic, 42 attr_journal_task, 43 } attr_id_t; 44 45 typedef enum { 46 ptr_explicit, 47 ptr_ext4_sb_info_offset, 48 ptr_ext4_super_block_offset, 49 } attr_ptr_t; 50 51 static const char proc_dirname[] = "fs/ext4"; 52 static struct proc_dir_entry *ext4_proc_root; 53 54 struct ext4_attr { 55 struct attribute attr; 56 short attr_id; 57 short attr_ptr; 58 unsigned short attr_size; 59 union { 60 int offset; 61 void *explicit_ptr; 62 } u; 63 }; 64 65 static ssize_t session_write_kbytes_show(struct ext4_sb_info *sbi, char *buf) 66 { 67 struct super_block *sb = sbi->s_buddy_cache->i_sb; 68 69 return sysfs_emit(buf, "%lu\n", 70 (part_stat_read(sb->s_bdev, sectors[STAT_WRITE]) - 71 sbi->s_sectors_written_start) >> 1); 72 } 73 74 static 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 return sysfs_emit(buf, "%llu\n", 79 (unsigned long long)(sbi->s_kbytes_written + 80 ((part_stat_read(sb->s_bdev, sectors[STAT_WRITE]) - 81 EXT4_SB(sb)->s_sectors_written_start) >> 1))); 82 } 83 84 static ssize_t inode_readahead_blks_store(struct ext4_sb_info *sbi, 85 const char *buf, size_t count) 86 { 87 unsigned long t; 88 int ret; 89 90 ret = kstrtoul(skip_spaces(buf), 0, &t); 91 if (ret) 92 return ret; 93 94 if (t && (!is_power_of_2(t) || t > 0x40000000)) 95 return -EINVAL; 96 97 sbi->s_inode_readahead_blks = t; 98 return count; 99 } 100 101 static ssize_t reserved_clusters_store(struct ext4_sb_info *sbi, 102 const char *buf, size_t count) 103 { 104 unsigned long long val; 105 ext4_fsblk_t clusters = (ext4_blocks_count(sbi->s_es) >> 106 sbi->s_cluster_bits); 107 int ret; 108 109 ret = kstrtoull(skip_spaces(buf), 0, &val); 110 if (ret || val >= clusters || (s64)val < 0) 111 return -EINVAL; 112 113 atomic64_set(&sbi->s_resv_clusters, val); 114 return count; 115 } 116 117 static ssize_t trigger_test_error(struct ext4_sb_info *sbi, 118 const char *buf, size_t count) 119 { 120 int len = count; 121 122 if (!capable(CAP_SYS_ADMIN)) 123 return -EPERM; 124 125 if (len && buf[len-1] == '\n') 126 len--; 127 128 if (len) 129 ext4_error(sbi->s_sb, "%.*s", len, buf); 130 return count; 131 } 132 133 static ssize_t journal_task_show(struct ext4_sb_info *sbi, char *buf) 134 { 135 if (!sbi->s_journal) 136 return sysfs_emit(buf, "<none>\n"); 137 return sysfs_emit(buf, "%d\n", 138 task_pid_vnr(sbi->s_journal->j_task)); 139 } 140 141 #define EXT4_ATTR(_name,_mode,_id) \ 142 static struct ext4_attr ext4_attr_##_name = { \ 143 .attr = {.name = __stringify(_name), .mode = _mode }, \ 144 .attr_id = attr_##_id, \ 145 } 146 147 #define EXT4_ATTR_FUNC(_name,_mode) EXT4_ATTR(_name,_mode,_name) 148 149 #define EXT4_ATTR_FEATURE(_name) EXT4_ATTR(_name, 0444, feature) 150 151 #define EXT4_ATTR_OFFSET(_name,_mode,_id,_struct,_elname) \ 152 static struct ext4_attr ext4_attr_##_name = { \ 153 .attr = {.name = __stringify(_name), .mode = _mode }, \ 154 .attr_id = attr_##_id, \ 155 .attr_ptr = ptr_##_struct##_offset, \ 156 .u = { \ 157 .offset = offsetof(struct _struct, _elname),\ 158 }, \ 159 } 160 161 #define EXT4_ATTR_STRING(_name,_mode,_size,_struct,_elname) \ 162 static struct ext4_attr ext4_attr_##_name = { \ 163 .attr = {.name = __stringify(_name), .mode = _mode }, \ 164 .attr_id = attr_pointer_string, \ 165 .attr_size = _size, \ 166 .attr_ptr = ptr_##_struct##_offset, \ 167 .u = { \ 168 .offset = offsetof(struct _struct, _elname),\ 169 }, \ 170 } 171 172 #define EXT4_RO_ATTR_ES_UI(_name,_elname) \ 173 EXT4_ATTR_OFFSET(_name, 0444, pointer_ui, ext4_super_block, _elname) 174 175 #define EXT4_RO_ATTR_ES_U8(_name,_elname) \ 176 EXT4_ATTR_OFFSET(_name, 0444, pointer_u8, ext4_super_block, _elname) 177 178 #define EXT4_RO_ATTR_ES_U64(_name,_elname) \ 179 EXT4_ATTR_OFFSET(_name, 0444, pointer_u64, ext4_super_block, _elname) 180 181 #define EXT4_RO_ATTR_ES_STRING(_name,_elname,_size) \ 182 EXT4_ATTR_STRING(_name, 0444, _size, ext4_super_block, _elname) 183 184 #define EXT4_RW_ATTR_SBI_PI(_name,_elname) \ 185 EXT4_ATTR_OFFSET(_name, 0644, pointer_pi, ext4_sb_info, _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) \ 197 static 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 207 208 EXT4_ATTR_FUNC(delayed_allocation_blocks, 0444); 209 EXT4_ATTR_FUNC(session_write_kbytes, 0444); 210 EXT4_ATTR_FUNC(lifetime_write_kbytes, 0444); 211 EXT4_ATTR_FUNC(reserved_clusters, 0644); 212 EXT4_ATTR_FUNC(sra_exceeded_retry_limit, 0444); 213 214 EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, inode_readahead, 215 ext4_sb_info, s_inode_readahead_blks); 216 EXT4_ATTR_OFFSET(mb_group_prealloc, 0644, clusters_in_group, 217 ext4_sb_info, s_mb_group_prealloc); 218 EXT4_ATTR_OFFSET(mb_best_avail_max_trim_order, 0644, mb_order, 219 ext4_sb_info, s_mb_best_avail_max_trim_order); 220 EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal); 221 EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats); 222 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan); 223 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan); 224 EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs); 225 EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request); 226 EXT4_RW_ATTR_SBI_UI(mb_max_linear_groups, s_mb_max_linear_groups); 227 EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb); 228 EXT4_ATTR(trigger_fs_error, 0200, trigger_test_error); 229 EXT4_RW_ATTR_SBI_PI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval); 230 EXT4_RW_ATTR_SBI_PI(err_ratelimit_burst, s_err_ratelimit_state.burst); 231 EXT4_RW_ATTR_SBI_PI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.interval); 232 EXT4_RW_ATTR_SBI_PI(warning_ratelimit_burst, s_warning_ratelimit_state.burst); 233 EXT4_RW_ATTR_SBI_PI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval); 234 EXT4_RW_ATTR_SBI_PI(msg_ratelimit_burst, s_msg_ratelimit_state.burst); 235 #ifdef CONFIG_EXT4_DEBUG 236 EXT4_RW_ATTR_SBI_UL(simulate_fail, s_simulate_fail); 237 #endif 238 EXT4_RO_ATTR_SBI_ATOMIC(warning_count, s_warning_count); 239 EXT4_RO_ATTR_SBI_ATOMIC(msg_count, s_msg_count); 240 EXT4_RO_ATTR_ES_UI(errors_count, s_error_count); 241 EXT4_RO_ATTR_ES_U8(first_error_errcode, s_first_error_errcode); 242 EXT4_RO_ATTR_ES_U8(last_error_errcode, s_last_error_errcode); 243 EXT4_RO_ATTR_ES_UI(first_error_ino, s_first_error_ino); 244 EXT4_RO_ATTR_ES_UI(last_error_ino, s_last_error_ino); 245 EXT4_RO_ATTR_ES_U64(first_error_block, s_first_error_block); 246 EXT4_RO_ATTR_ES_U64(last_error_block, s_last_error_block); 247 EXT4_RO_ATTR_ES_UI(first_error_line, s_first_error_line); 248 EXT4_RO_ATTR_ES_UI(last_error_line, s_last_error_line); 249 EXT4_RO_ATTR_ES_STRING(first_error_func, s_first_error_func, 32); 250 EXT4_RO_ATTR_ES_STRING(last_error_func, s_last_error_func, 32); 251 EXT4_ATTR(first_error_time, 0444, first_error_time); 252 EXT4_ATTR(last_error_time, 0444, last_error_time); 253 EXT4_ATTR(journal_task, 0444, journal_task); 254 EXT4_RW_ATTR_SBI_UI(mb_prefetch, s_mb_prefetch); 255 EXT4_RW_ATTR_SBI_UI(mb_prefetch_limit, s_mb_prefetch_limit); 256 EXT4_RW_ATTR_SBI_UL(last_trim_minblks, s_last_trim_minblks); 257 258 static unsigned int old_bump_val = 128; 259 EXT4_ATTR_PTR(max_writeback_mb_bump, 0444, pointer_ui, &old_bump_val); 260 261 static struct attribute *ext4_attrs[] = { 262 ATTR_LIST(delayed_allocation_blocks), 263 ATTR_LIST(session_write_kbytes), 264 ATTR_LIST(lifetime_write_kbytes), 265 ATTR_LIST(reserved_clusters), 266 ATTR_LIST(sra_exceeded_retry_limit), 267 ATTR_LIST(inode_readahead_blks), 268 ATTR_LIST(inode_goal), 269 ATTR_LIST(mb_stats), 270 ATTR_LIST(mb_max_to_scan), 271 ATTR_LIST(mb_min_to_scan), 272 ATTR_LIST(mb_order2_req), 273 ATTR_LIST(mb_stream_req), 274 ATTR_LIST(mb_group_prealloc), 275 ATTR_LIST(mb_max_linear_groups), 276 ATTR_LIST(max_writeback_mb_bump), 277 ATTR_LIST(extent_max_zeroout_kb), 278 ATTR_LIST(trigger_fs_error), 279 ATTR_LIST(err_ratelimit_interval_ms), 280 ATTR_LIST(err_ratelimit_burst), 281 ATTR_LIST(warning_ratelimit_interval_ms), 282 ATTR_LIST(warning_ratelimit_burst), 283 ATTR_LIST(msg_ratelimit_interval_ms), 284 ATTR_LIST(msg_ratelimit_burst), 285 ATTR_LIST(mb_best_avail_max_trim_order), 286 ATTR_LIST(errors_count), 287 ATTR_LIST(warning_count), 288 ATTR_LIST(msg_count), 289 ATTR_LIST(first_error_ino), 290 ATTR_LIST(last_error_ino), 291 ATTR_LIST(first_error_block), 292 ATTR_LIST(last_error_block), 293 ATTR_LIST(first_error_line), 294 ATTR_LIST(last_error_line), 295 ATTR_LIST(first_error_func), 296 ATTR_LIST(last_error_func), 297 ATTR_LIST(first_error_errcode), 298 ATTR_LIST(last_error_errcode), 299 ATTR_LIST(first_error_time), 300 ATTR_LIST(last_error_time), 301 ATTR_LIST(journal_task), 302 #ifdef CONFIG_EXT4_DEBUG 303 ATTR_LIST(simulate_fail), 304 #endif 305 ATTR_LIST(mb_prefetch), 306 ATTR_LIST(mb_prefetch_limit), 307 ATTR_LIST(last_trim_minblks), 308 NULL, 309 }; 310 ATTRIBUTE_GROUPS(ext4); 311 312 /* Features this copy of ext4 supports */ 313 EXT4_ATTR_FEATURE(lazy_itable_init); 314 EXT4_ATTR_FEATURE(batched_discard); 315 EXT4_ATTR_FEATURE(meta_bg_resize); 316 #ifdef CONFIG_FS_ENCRYPTION 317 EXT4_ATTR_FEATURE(encryption); 318 EXT4_ATTR_FEATURE(test_dummy_encryption_v2); 319 #endif 320 #if IS_ENABLED(CONFIG_UNICODE) 321 EXT4_ATTR_FEATURE(casefold); 322 #endif 323 #ifdef CONFIG_FS_VERITY 324 EXT4_ATTR_FEATURE(verity); 325 #endif 326 EXT4_ATTR_FEATURE(metadata_csum_seed); 327 EXT4_ATTR_FEATURE(fast_commit); 328 #if IS_ENABLED(CONFIG_UNICODE) && defined(CONFIG_FS_ENCRYPTION) 329 EXT4_ATTR_FEATURE(encrypted_casefold); 330 #endif 331 332 static struct attribute *ext4_feat_attrs[] = { 333 ATTR_LIST(lazy_itable_init), 334 ATTR_LIST(batched_discard), 335 ATTR_LIST(meta_bg_resize), 336 #ifdef CONFIG_FS_ENCRYPTION 337 ATTR_LIST(encryption), 338 ATTR_LIST(test_dummy_encryption_v2), 339 #endif 340 #if IS_ENABLED(CONFIG_UNICODE) 341 ATTR_LIST(casefold), 342 #endif 343 #ifdef CONFIG_FS_VERITY 344 ATTR_LIST(verity), 345 #endif 346 ATTR_LIST(metadata_csum_seed), 347 ATTR_LIST(fast_commit), 348 #if IS_ENABLED(CONFIG_UNICODE) && defined(CONFIG_FS_ENCRYPTION) 349 ATTR_LIST(encrypted_casefold), 350 #endif 351 NULL, 352 }; 353 ATTRIBUTE_GROUPS(ext4_feat); 354 355 static void *calc_ptr(struct ext4_attr *a, struct ext4_sb_info *sbi) 356 { 357 switch (a->attr_ptr) { 358 case ptr_explicit: 359 return a->u.explicit_ptr; 360 case ptr_ext4_sb_info_offset: 361 return (void *) (((char *) sbi) + a->u.offset); 362 case ptr_ext4_super_block_offset: 363 return (void *) (((char *) sbi->s_es) + a->u.offset); 364 } 365 return NULL; 366 } 367 368 static ssize_t __print_tstamp(char *buf, __le32 lo, __u8 hi) 369 { 370 return sysfs_emit(buf, "%lld\n", 371 ((time64_t)hi << 32) + le32_to_cpu(lo)); 372 } 373 374 #define print_tstamp(buf, es, tstamp) \ 375 __print_tstamp(buf, (es)->tstamp, (es)->tstamp ## _hi) 376 377 static ssize_t ext4_generic_attr_show(struct ext4_attr *a, 378 struct ext4_sb_info *sbi, char *buf) 379 { 380 void *ptr = calc_ptr(a, sbi); 381 382 if (!ptr) 383 return 0; 384 385 switch (a->attr_id) { 386 case attr_inode_readahead: 387 case attr_clusters_in_group: 388 case attr_mb_order: 389 case attr_pointer_pi: 390 case attr_pointer_ui: 391 if (a->attr_ptr == ptr_ext4_super_block_offset) 392 return sysfs_emit(buf, "%u\n", le32_to_cpup(ptr)); 393 return sysfs_emit(buf, "%u\n", *((unsigned int *) ptr)); 394 case attr_pointer_ul: 395 return sysfs_emit(buf, "%lu\n", *((unsigned long *) ptr)); 396 case attr_pointer_u8: 397 return sysfs_emit(buf, "%u\n", *((unsigned char *) ptr)); 398 case attr_pointer_u64: 399 if (a->attr_ptr == ptr_ext4_super_block_offset) 400 return sysfs_emit(buf, "%llu\n", le64_to_cpup(ptr)); 401 return sysfs_emit(buf, "%llu\n", *((unsigned long long *) ptr)); 402 case attr_pointer_string: 403 return sysfs_emit(buf, "%.*s\n", a->attr_size, (char *) ptr); 404 case attr_pointer_atomic: 405 return sysfs_emit(buf, "%d\n", atomic_read((atomic_t *) ptr)); 406 } 407 return 0; 408 } 409 410 static ssize_t ext4_attr_show(struct kobject *kobj, 411 struct attribute *attr, char *buf) 412 { 413 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, 414 s_kobj); 415 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr); 416 417 switch (a->attr_id) { 418 case attr_delayed_allocation_blocks: 419 return sysfs_emit(buf, "%llu\n", 420 (s64) EXT4_C2B(sbi, 421 percpu_counter_sum(&sbi->s_dirtyclusters_counter))); 422 case attr_session_write_kbytes: 423 return session_write_kbytes_show(sbi, buf); 424 case attr_lifetime_write_kbytes: 425 return lifetime_write_kbytes_show(sbi, buf); 426 case attr_reserved_clusters: 427 return sysfs_emit(buf, "%llu\n", 428 (unsigned long long) 429 atomic64_read(&sbi->s_resv_clusters)); 430 case attr_sra_exceeded_retry_limit: 431 return sysfs_emit(buf, "%llu\n", 432 (unsigned long long) 433 percpu_counter_sum(&sbi->s_sra_exceeded_retry_limit)); 434 case attr_feature: 435 return sysfs_emit(buf, "supported\n"); 436 case attr_first_error_time: 437 return print_tstamp(buf, sbi->s_es, s_first_error_time); 438 case attr_last_error_time: 439 return print_tstamp(buf, sbi->s_es, s_last_error_time); 440 case attr_journal_task: 441 return journal_task_show(sbi, buf); 442 default: 443 return ext4_generic_attr_show(a, sbi, buf); 444 } 445 } 446 447 static ssize_t ext4_generic_attr_store(struct ext4_attr *a, 448 struct ext4_sb_info *sbi, 449 const char *buf, size_t len) 450 { 451 int ret; 452 unsigned int t; 453 unsigned long lt; 454 void *ptr = calc_ptr(a, sbi); 455 456 if (!ptr) 457 return 0; 458 459 switch (a->attr_id) { 460 case attr_pointer_pi: 461 ret = kstrtouint(skip_spaces(buf), 0, &t); 462 if (ret) 463 return ret; 464 if ((int)t < 0) 465 return -EINVAL; 466 *((unsigned int *) ptr) = t; 467 return len; 468 case attr_pointer_ui: 469 ret = kstrtouint(skip_spaces(buf), 0, &t); 470 if (ret) 471 return ret; 472 if (a->attr_ptr == ptr_ext4_super_block_offset) 473 *((__le32 *) ptr) = cpu_to_le32(t); 474 else 475 *((unsigned int *) ptr) = t; 476 return len; 477 case attr_mb_order: 478 ret = kstrtouint(skip_spaces(buf), 0, &t); 479 if (ret) 480 return ret; 481 if (t > 64) 482 return -EINVAL; 483 *((unsigned int *) ptr) = t; 484 return len; 485 case attr_clusters_in_group: 486 ret = kstrtouint(skip_spaces(buf), 0, &t); 487 if (ret) 488 return ret; 489 if (t > sbi->s_clusters_per_group) 490 return -EINVAL; 491 *((unsigned int *) ptr) = t; 492 return len; 493 case attr_pointer_ul: 494 ret = kstrtoul(skip_spaces(buf), 0, <); 495 if (ret) 496 return ret; 497 *((unsigned long *) ptr) = lt; 498 return len; 499 } 500 return 0; 501 } 502 503 static ssize_t ext4_attr_store(struct kobject *kobj, 504 struct attribute *attr, 505 const char *buf, size_t len) 506 { 507 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, 508 s_kobj); 509 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr); 510 511 switch (a->attr_id) { 512 case attr_reserved_clusters: 513 return reserved_clusters_store(sbi, buf, len); 514 case attr_inode_readahead: 515 return inode_readahead_blks_store(sbi, buf, len); 516 case attr_trigger_test_error: 517 return trigger_test_error(sbi, buf, len); 518 default: 519 return ext4_generic_attr_store(a, sbi, buf, len); 520 } 521 } 522 523 static void ext4_sb_release(struct kobject *kobj) 524 { 525 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, 526 s_kobj); 527 complete(&sbi->s_kobj_unregister); 528 } 529 530 static void ext4_feat_release(struct kobject *kobj) 531 { 532 kfree(kobj); 533 } 534 535 static const struct sysfs_ops ext4_attr_ops = { 536 .show = ext4_attr_show, 537 .store = ext4_attr_store, 538 }; 539 540 static const struct kobj_type ext4_sb_ktype = { 541 .default_groups = ext4_groups, 542 .sysfs_ops = &ext4_attr_ops, 543 .release = ext4_sb_release, 544 }; 545 546 static const struct kobj_type ext4_feat_ktype = { 547 .default_groups = ext4_feat_groups, 548 .sysfs_ops = &ext4_attr_ops, 549 .release = ext4_feat_release, 550 }; 551 552 void ext4_notify_error_sysfs(struct ext4_sb_info *sbi) 553 { 554 sysfs_notify(&sbi->s_kobj, NULL, "errors_count"); 555 } 556 557 static struct kobject *ext4_root; 558 559 static struct kobject *ext4_feat; 560 561 int ext4_register_sysfs(struct super_block *sb) 562 { 563 struct ext4_sb_info *sbi = EXT4_SB(sb); 564 int err; 565 566 init_completion(&sbi->s_kobj_unregister); 567 err = kobject_init_and_add(&sbi->s_kobj, &ext4_sb_ktype, ext4_root, 568 "%s", sb->s_id); 569 if (err) { 570 kobject_put(&sbi->s_kobj); 571 wait_for_completion(&sbi->s_kobj_unregister); 572 return err; 573 } 574 575 if (ext4_proc_root) 576 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root); 577 if (sbi->s_proc) { 578 proc_create_single_data("options", S_IRUGO, sbi->s_proc, 579 ext4_seq_options_show, sb); 580 proc_create_single_data("es_shrinker_info", S_IRUGO, 581 sbi->s_proc, ext4_seq_es_shrinker_info_show, 582 sb); 583 proc_create_single_data("fc_info", 0444, sbi->s_proc, 584 ext4_fc_info_show, sb); 585 proc_create_seq_data("mb_groups", S_IRUGO, sbi->s_proc, 586 &ext4_mb_seq_groups_ops, sb); 587 proc_create_single_data("mb_stats", 0444, sbi->s_proc, 588 ext4_seq_mb_stats_show, sb); 589 proc_create_seq_data("mb_structs_summary", 0444, sbi->s_proc, 590 &ext4_mb_seq_structs_summary_ops, sb); 591 } 592 return 0; 593 } 594 595 void ext4_unregister_sysfs(struct super_block *sb) 596 { 597 struct ext4_sb_info *sbi = EXT4_SB(sb); 598 599 if (sbi->s_proc) 600 remove_proc_subtree(sb->s_id, ext4_proc_root); 601 kobject_del(&sbi->s_kobj); 602 } 603 604 int __init ext4_init_sysfs(void) 605 { 606 int ret; 607 608 ext4_root = kobject_create_and_add("ext4", fs_kobj); 609 if (!ext4_root) 610 return -ENOMEM; 611 612 ext4_feat = kzalloc(sizeof(*ext4_feat), GFP_KERNEL); 613 if (!ext4_feat) { 614 ret = -ENOMEM; 615 goto root_err; 616 } 617 618 ret = kobject_init_and_add(ext4_feat, &ext4_feat_ktype, 619 ext4_root, "features"); 620 if (ret) 621 goto feat_err; 622 623 ext4_proc_root = proc_mkdir(proc_dirname, NULL); 624 return ret; 625 626 feat_err: 627 kobject_put(ext4_feat); 628 ext4_feat = NULL; 629 root_err: 630 kobject_put(ext4_root); 631 ext4_root = NULL; 632 return ret; 633 } 634 635 void ext4_exit_sysfs(void) 636 { 637 kobject_put(ext4_feat); 638 ext4_feat = NULL; 639 kobject_put(ext4_root); 640 ext4_root = NULL; 641 remove_proc_entry(proc_dirname, NULL); 642 ext4_proc_root = NULL; 643 } 644 645