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 EXT4_RW_ATTR_SBI_UI(sb_update_sec, s_sb_update_sec); 258 EXT4_RW_ATTR_SBI_UI(sb_update_kb, s_sb_update_kb); 259 260 static unsigned int old_bump_val = 128; 261 EXT4_ATTR_PTR(max_writeback_mb_bump, 0444, pointer_ui, &old_bump_val); 262 263 static struct attribute *ext4_attrs[] = { 264 ATTR_LIST(delayed_allocation_blocks), 265 ATTR_LIST(session_write_kbytes), 266 ATTR_LIST(lifetime_write_kbytes), 267 ATTR_LIST(reserved_clusters), 268 ATTR_LIST(sra_exceeded_retry_limit), 269 ATTR_LIST(inode_readahead_blks), 270 ATTR_LIST(inode_goal), 271 ATTR_LIST(mb_stats), 272 ATTR_LIST(mb_max_to_scan), 273 ATTR_LIST(mb_min_to_scan), 274 ATTR_LIST(mb_order2_req), 275 ATTR_LIST(mb_stream_req), 276 ATTR_LIST(mb_group_prealloc), 277 ATTR_LIST(mb_max_linear_groups), 278 ATTR_LIST(max_writeback_mb_bump), 279 ATTR_LIST(extent_max_zeroout_kb), 280 ATTR_LIST(trigger_fs_error), 281 ATTR_LIST(err_ratelimit_interval_ms), 282 ATTR_LIST(err_ratelimit_burst), 283 ATTR_LIST(warning_ratelimit_interval_ms), 284 ATTR_LIST(warning_ratelimit_burst), 285 ATTR_LIST(msg_ratelimit_interval_ms), 286 ATTR_LIST(msg_ratelimit_burst), 287 ATTR_LIST(mb_best_avail_max_trim_order), 288 ATTR_LIST(errors_count), 289 ATTR_LIST(warning_count), 290 ATTR_LIST(msg_count), 291 ATTR_LIST(first_error_ino), 292 ATTR_LIST(last_error_ino), 293 ATTR_LIST(first_error_block), 294 ATTR_LIST(last_error_block), 295 ATTR_LIST(first_error_line), 296 ATTR_LIST(last_error_line), 297 ATTR_LIST(first_error_func), 298 ATTR_LIST(last_error_func), 299 ATTR_LIST(first_error_errcode), 300 ATTR_LIST(last_error_errcode), 301 ATTR_LIST(first_error_time), 302 ATTR_LIST(last_error_time), 303 ATTR_LIST(journal_task), 304 #ifdef CONFIG_EXT4_DEBUG 305 ATTR_LIST(simulate_fail), 306 #endif 307 ATTR_LIST(mb_prefetch), 308 ATTR_LIST(mb_prefetch_limit), 309 ATTR_LIST(last_trim_minblks), 310 ATTR_LIST(sb_update_sec), 311 ATTR_LIST(sb_update_kb), 312 NULL, 313 }; 314 ATTRIBUTE_GROUPS(ext4); 315 316 /* Features this copy of ext4 supports */ 317 EXT4_ATTR_FEATURE(lazy_itable_init); 318 EXT4_ATTR_FEATURE(batched_discard); 319 EXT4_ATTR_FEATURE(meta_bg_resize); 320 #ifdef CONFIG_FS_ENCRYPTION 321 EXT4_ATTR_FEATURE(encryption); 322 EXT4_ATTR_FEATURE(test_dummy_encryption_v2); 323 #endif 324 #if IS_ENABLED(CONFIG_UNICODE) 325 EXT4_ATTR_FEATURE(casefold); 326 #endif 327 #ifdef CONFIG_FS_VERITY 328 EXT4_ATTR_FEATURE(verity); 329 #endif 330 EXT4_ATTR_FEATURE(metadata_csum_seed); 331 EXT4_ATTR_FEATURE(fast_commit); 332 #if IS_ENABLED(CONFIG_UNICODE) && defined(CONFIG_FS_ENCRYPTION) 333 EXT4_ATTR_FEATURE(encrypted_casefold); 334 #endif 335 336 static struct attribute *ext4_feat_attrs[] = { 337 ATTR_LIST(lazy_itable_init), 338 ATTR_LIST(batched_discard), 339 ATTR_LIST(meta_bg_resize), 340 #ifdef CONFIG_FS_ENCRYPTION 341 ATTR_LIST(encryption), 342 ATTR_LIST(test_dummy_encryption_v2), 343 #endif 344 #if IS_ENABLED(CONFIG_UNICODE) 345 ATTR_LIST(casefold), 346 #endif 347 #ifdef CONFIG_FS_VERITY 348 ATTR_LIST(verity), 349 #endif 350 ATTR_LIST(metadata_csum_seed), 351 ATTR_LIST(fast_commit), 352 #if IS_ENABLED(CONFIG_UNICODE) && defined(CONFIG_FS_ENCRYPTION) 353 ATTR_LIST(encrypted_casefold), 354 #endif 355 NULL, 356 }; 357 ATTRIBUTE_GROUPS(ext4_feat); 358 359 static void *calc_ptr(struct ext4_attr *a, struct ext4_sb_info *sbi) 360 { 361 switch (a->attr_ptr) { 362 case ptr_explicit: 363 return a->u.explicit_ptr; 364 case ptr_ext4_sb_info_offset: 365 return (void *) (((char *) sbi) + a->u.offset); 366 case ptr_ext4_super_block_offset: 367 return (void *) (((char *) sbi->s_es) + a->u.offset); 368 } 369 return NULL; 370 } 371 372 static ssize_t __print_tstamp(char *buf, __le32 lo, __u8 hi) 373 { 374 return sysfs_emit(buf, "%lld\n", 375 ((time64_t)hi << 32) + le32_to_cpu(lo)); 376 } 377 378 #define print_tstamp(buf, es, tstamp) \ 379 __print_tstamp(buf, (es)->tstamp, (es)->tstamp ## _hi) 380 381 static ssize_t ext4_generic_attr_show(struct ext4_attr *a, 382 struct ext4_sb_info *sbi, char *buf) 383 { 384 void *ptr = calc_ptr(a, sbi); 385 386 if (!ptr) 387 return 0; 388 389 switch (a->attr_id) { 390 case attr_inode_readahead: 391 case attr_clusters_in_group: 392 case attr_mb_order: 393 case attr_pointer_pi: 394 case attr_pointer_ui: 395 if (a->attr_ptr == ptr_ext4_super_block_offset) 396 return sysfs_emit(buf, "%u\n", le32_to_cpup(ptr)); 397 return sysfs_emit(buf, "%u\n", *((unsigned int *) ptr)); 398 case attr_pointer_ul: 399 return sysfs_emit(buf, "%lu\n", *((unsigned long *) ptr)); 400 case attr_pointer_u8: 401 return sysfs_emit(buf, "%u\n", *((unsigned char *) ptr)); 402 case attr_pointer_u64: 403 if (a->attr_ptr == ptr_ext4_super_block_offset) 404 return sysfs_emit(buf, "%llu\n", le64_to_cpup(ptr)); 405 return sysfs_emit(buf, "%llu\n", *((unsigned long long *) ptr)); 406 case attr_pointer_string: 407 return sysfs_emit(buf, "%.*s\n", a->attr_size, (char *) ptr); 408 case attr_pointer_atomic: 409 return sysfs_emit(buf, "%d\n", atomic_read((atomic_t *) ptr)); 410 } 411 return 0; 412 } 413 414 static ssize_t ext4_attr_show(struct kobject *kobj, 415 struct attribute *attr, char *buf) 416 { 417 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, 418 s_kobj); 419 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr); 420 421 switch (a->attr_id) { 422 case attr_delayed_allocation_blocks: 423 return sysfs_emit(buf, "%llu\n", 424 (s64) EXT4_C2B(sbi, 425 percpu_counter_sum(&sbi->s_dirtyclusters_counter))); 426 case attr_session_write_kbytes: 427 return session_write_kbytes_show(sbi, buf); 428 case attr_lifetime_write_kbytes: 429 return lifetime_write_kbytes_show(sbi, buf); 430 case attr_reserved_clusters: 431 return sysfs_emit(buf, "%llu\n", 432 (unsigned long long) 433 atomic64_read(&sbi->s_resv_clusters)); 434 case attr_sra_exceeded_retry_limit: 435 return sysfs_emit(buf, "%llu\n", 436 (unsigned long long) 437 percpu_counter_sum(&sbi->s_sra_exceeded_retry_limit)); 438 case attr_feature: 439 return sysfs_emit(buf, "supported\n"); 440 case attr_first_error_time: 441 return print_tstamp(buf, sbi->s_es, s_first_error_time); 442 case attr_last_error_time: 443 return print_tstamp(buf, sbi->s_es, s_last_error_time); 444 case attr_journal_task: 445 return journal_task_show(sbi, buf); 446 default: 447 return ext4_generic_attr_show(a, sbi, buf); 448 } 449 } 450 451 static ssize_t ext4_generic_attr_store(struct ext4_attr *a, 452 struct ext4_sb_info *sbi, 453 const char *buf, size_t len) 454 { 455 int ret; 456 unsigned int t; 457 unsigned long lt; 458 void *ptr = calc_ptr(a, sbi); 459 460 if (!ptr) 461 return 0; 462 463 switch (a->attr_id) { 464 case attr_pointer_pi: 465 ret = kstrtouint(skip_spaces(buf), 0, &t); 466 if (ret) 467 return ret; 468 if ((int)t < 0) 469 return -EINVAL; 470 *((unsigned int *) ptr) = t; 471 return len; 472 case attr_pointer_ui: 473 ret = kstrtouint(skip_spaces(buf), 0, &t); 474 if (ret) 475 return ret; 476 if (a->attr_ptr == ptr_ext4_super_block_offset) 477 *((__le32 *) ptr) = cpu_to_le32(t); 478 else 479 *((unsigned int *) ptr) = t; 480 return len; 481 case attr_mb_order: 482 ret = kstrtouint(skip_spaces(buf), 0, &t); 483 if (ret) 484 return ret; 485 if (t > 64) 486 return -EINVAL; 487 *((unsigned int *) ptr) = t; 488 return len; 489 case attr_clusters_in_group: 490 ret = kstrtouint(skip_spaces(buf), 0, &t); 491 if (ret) 492 return ret; 493 if (t > sbi->s_clusters_per_group) 494 return -EINVAL; 495 *((unsigned int *) ptr) = t; 496 return len; 497 case attr_pointer_ul: 498 ret = kstrtoul(skip_spaces(buf), 0, <); 499 if (ret) 500 return ret; 501 *((unsigned long *) ptr) = lt; 502 return len; 503 } 504 return 0; 505 } 506 507 static ssize_t ext4_attr_store(struct kobject *kobj, 508 struct attribute *attr, 509 const char *buf, size_t len) 510 { 511 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, 512 s_kobj); 513 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr); 514 515 switch (a->attr_id) { 516 case attr_reserved_clusters: 517 return reserved_clusters_store(sbi, buf, len); 518 case attr_inode_readahead: 519 return inode_readahead_blks_store(sbi, buf, len); 520 case attr_trigger_test_error: 521 return trigger_test_error(sbi, buf, len); 522 default: 523 return ext4_generic_attr_store(a, sbi, buf, len); 524 } 525 } 526 527 static void ext4_sb_release(struct kobject *kobj) 528 { 529 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, 530 s_kobj); 531 complete(&sbi->s_kobj_unregister); 532 } 533 534 static void ext4_feat_release(struct kobject *kobj) 535 { 536 kfree(kobj); 537 } 538 539 static const struct sysfs_ops ext4_attr_ops = { 540 .show = ext4_attr_show, 541 .store = ext4_attr_store, 542 }; 543 544 static const struct kobj_type ext4_sb_ktype = { 545 .default_groups = ext4_groups, 546 .sysfs_ops = &ext4_attr_ops, 547 .release = ext4_sb_release, 548 }; 549 550 static const struct kobj_type ext4_feat_ktype = { 551 .default_groups = ext4_feat_groups, 552 .sysfs_ops = &ext4_attr_ops, 553 .release = ext4_feat_release, 554 }; 555 556 void ext4_notify_error_sysfs(struct ext4_sb_info *sbi) 557 { 558 sysfs_notify(&sbi->s_kobj, NULL, "errors_count"); 559 } 560 561 static struct kobject *ext4_root; 562 563 static struct kobject *ext4_feat; 564 565 int ext4_register_sysfs(struct super_block *sb) 566 { 567 struct ext4_sb_info *sbi = EXT4_SB(sb); 568 int err; 569 570 init_completion(&sbi->s_kobj_unregister); 571 err = kobject_init_and_add(&sbi->s_kobj, &ext4_sb_ktype, ext4_root, 572 "%s", sb->s_id); 573 if (err) { 574 kobject_put(&sbi->s_kobj); 575 wait_for_completion(&sbi->s_kobj_unregister); 576 return err; 577 } 578 579 if (ext4_proc_root) 580 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root); 581 if (sbi->s_proc) { 582 proc_create_single_data("options", S_IRUGO, sbi->s_proc, 583 ext4_seq_options_show, sb); 584 proc_create_single_data("es_shrinker_info", S_IRUGO, 585 sbi->s_proc, ext4_seq_es_shrinker_info_show, 586 sb); 587 proc_create_single_data("fc_info", 0444, sbi->s_proc, 588 ext4_fc_info_show, sb); 589 proc_create_seq_data("mb_groups", S_IRUGO, sbi->s_proc, 590 &ext4_mb_seq_groups_ops, sb); 591 proc_create_single_data("mb_stats", 0444, sbi->s_proc, 592 ext4_seq_mb_stats_show, sb); 593 proc_create_seq_data("mb_structs_summary", 0444, sbi->s_proc, 594 &ext4_mb_seq_structs_summary_ops, sb); 595 } 596 return 0; 597 } 598 599 void ext4_unregister_sysfs(struct super_block *sb) 600 { 601 struct ext4_sb_info *sbi = EXT4_SB(sb); 602 603 if (sbi->s_proc) 604 remove_proc_subtree(sb->s_id, ext4_proc_root); 605 kobject_del(&sbi->s_kobj); 606 } 607 608 int __init ext4_init_sysfs(void) 609 { 610 int ret; 611 612 ext4_root = kobject_create_and_add("ext4", fs_kobj); 613 if (!ext4_root) 614 return -ENOMEM; 615 616 ext4_feat = kzalloc(sizeof(*ext4_feat), GFP_KERNEL); 617 if (!ext4_feat) { 618 ret = -ENOMEM; 619 goto root_err; 620 } 621 622 ret = kobject_init_and_add(ext4_feat, &ext4_feat_ktype, 623 ext4_root, "features"); 624 if (ret) 625 goto feat_err; 626 627 ext4_proc_root = proc_mkdir(proc_dirname, NULL); 628 return ret; 629 630 feat_err: 631 kobject_put(ext4_feat); 632 ext4_feat = NULL; 633 root_err: 634 kobject_put(ext4_root); 635 ext4_root = NULL; 636 return ret; 637 } 638 639 void ext4_exit_sysfs(void) 640 { 641 kobject_put(ext4_feat); 642 ext4_feat = NULL; 643 kobject_put(ext4_root); 644 ext4_root = NULL; 645 remove_proc_entry(proc_dirname, NULL); 646 ext4_proc_root = NULL; 647 } 648 649