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_err_report_sec, 44 } attr_id_t; 45 46 typedef enum { 47 ptr_explicit, 48 ptr_ext4_sb_info_offset, 49 ptr_ext4_super_block_offset, 50 } attr_ptr_t; 51 52 static const char proc_dirname[] = "fs/ext4"; 53 static struct proc_dir_entry *ext4_proc_root; 54 55 struct ext4_attr { 56 struct attribute attr; 57 short attr_id; 58 short attr_ptr; 59 unsigned short attr_size; 60 union { 61 int offset; 62 void *explicit_ptr; 63 } u; 64 }; 65 66 static ssize_t session_write_kbytes_show(struct ext4_sb_info *sbi, char *buf) 67 { 68 struct super_block *sb = sbi->s_buddy_cache->i_sb; 69 70 return sysfs_emit(buf, "%lu\n", 71 (part_stat_read(sb->s_bdev, sectors[STAT_WRITE]) - 72 sbi->s_sectors_written_start) >> 1); 73 } 74 75 static ssize_t lifetime_write_kbytes_show(struct ext4_sb_info *sbi, char *buf) 76 { 77 struct super_block *sb = sbi->s_buddy_cache->i_sb; 78 79 return sysfs_emit(buf, "%llu\n", 80 (unsigned long long)(sbi->s_kbytes_written + 81 ((part_stat_read(sb->s_bdev, sectors[STAT_WRITE]) - 82 EXT4_SB(sb)->s_sectors_written_start) >> 1))); 83 } 84 85 static ssize_t inode_readahead_blks_store(struct ext4_sb_info *sbi, 86 const char *buf, size_t count) 87 { 88 unsigned long t; 89 int ret; 90 91 ret = kstrtoul(skip_spaces(buf), 0, &t); 92 if (ret) 93 return ret; 94 95 if (t && (!is_power_of_2(t) || t > 0x40000000)) 96 return -EINVAL; 97 98 sbi->s_inode_readahead_blks = t; 99 return count; 100 } 101 102 static ssize_t reserved_clusters_store(struct ext4_sb_info *sbi, 103 const char *buf, size_t count) 104 { 105 unsigned long long val; 106 ext4_fsblk_t clusters = (ext4_blocks_count(sbi->s_es) >> 107 sbi->s_cluster_bits); 108 int ret; 109 110 ret = kstrtoull(skip_spaces(buf), 0, &val); 111 if (ret || val >= clusters || (s64)val < 0) 112 return -EINVAL; 113 114 atomic64_set(&sbi->s_resv_clusters, val); 115 return count; 116 } 117 118 static ssize_t trigger_test_error(struct ext4_sb_info *sbi, 119 const char *buf, size_t count) 120 { 121 int len = count; 122 123 if (!capable(CAP_SYS_ADMIN)) 124 return -EPERM; 125 126 if (len && buf[len-1] == '\n') 127 len--; 128 129 if (len) 130 ext4_error(sbi->s_sb, "%.*s", len, buf); 131 return count; 132 } 133 134 static ssize_t err_report_sec_store(struct ext4_sb_info *sbi, 135 const char *buf, size_t count) 136 { 137 unsigned long t; 138 int ret; 139 140 ret = kstrtoul(skip_spaces(buf), 0, &t); 141 if (ret) 142 return ret; 143 144 /*the maximum time interval must not exceed one year.*/ 145 if (t > (365*24*60*60)) 146 return -EINVAL; 147 148 if (sbi->s_err_report_sec == t) /*nothing to do*/ 149 goto out; 150 else if (!sbi->s_err_report_sec && t) { 151 timer_setup(&sbi->s_err_report, print_daily_error_info, 0); 152 } else if (sbi->s_err_report_sec && !t) { 153 timer_delete_sync(&sbi->s_err_report); 154 goto out; 155 } 156 157 sbi->s_err_report_sec = t; 158 mod_timer(&sbi->s_err_report, jiffies + secs_to_jiffies(sbi->s_err_report_sec)); 159 160 out: 161 return count; 162 } 163 164 static ssize_t journal_task_show(struct ext4_sb_info *sbi, char *buf) 165 { 166 if (!sbi->s_journal) 167 return sysfs_emit(buf, "<none>\n"); 168 return sysfs_emit(buf, "%d\n", 169 task_pid_vnr(sbi->s_journal->j_task)); 170 } 171 172 #define EXT4_ATTR(_name,_mode,_id) \ 173 static struct ext4_attr ext4_attr_##_name = { \ 174 .attr = {.name = __stringify(_name), .mode = _mode }, \ 175 .attr_id = attr_##_id, \ 176 } 177 178 #define EXT4_ATTR_FUNC(_name,_mode) EXT4_ATTR(_name,_mode,_name) 179 180 #define EXT4_ATTR_FEATURE(_name) EXT4_ATTR(_name, 0444, feature) 181 182 #define EXT4_ATTR_OFFSET(_name,_mode,_id,_struct,_elname) \ 183 static struct ext4_attr ext4_attr_##_name = { \ 184 .attr = {.name = __stringify(_name), .mode = _mode }, \ 185 .attr_id = attr_##_id, \ 186 .attr_ptr = ptr_##_struct##_offset, \ 187 .u = { \ 188 .offset = offsetof(struct _struct, _elname),\ 189 }, \ 190 } 191 192 #define EXT4_ATTR_STRING(_name,_mode,_size,_struct,_elname) \ 193 static struct ext4_attr ext4_attr_##_name = { \ 194 .attr = {.name = __stringify(_name), .mode = _mode }, \ 195 .attr_id = attr_pointer_string, \ 196 .attr_size = _size, \ 197 .attr_ptr = ptr_##_struct##_offset, \ 198 .u = { \ 199 .offset = offsetof(struct _struct, _elname),\ 200 }, \ 201 } 202 203 #define EXT4_RO_ATTR_ES_UI(_name,_elname) \ 204 EXT4_ATTR_OFFSET(_name, 0444, pointer_ui, ext4_super_block, _elname) 205 206 #define EXT4_RO_ATTR_ES_U8(_name,_elname) \ 207 EXT4_ATTR_OFFSET(_name, 0444, pointer_u8, ext4_super_block, _elname) 208 209 #define EXT4_RO_ATTR_ES_U64(_name,_elname) \ 210 EXT4_ATTR_OFFSET(_name, 0444, pointer_u64, ext4_super_block, _elname) 211 212 #define EXT4_RO_ATTR_ES_STRING(_name,_elname,_size) \ 213 EXT4_ATTR_STRING(_name, 0444, _size, ext4_super_block, _elname) 214 215 #define EXT4_RW_ATTR_SBI_PI(_name,_elname) \ 216 EXT4_ATTR_OFFSET(_name, 0644, pointer_pi, ext4_sb_info, _elname) 217 218 #define EXT4_RW_ATTR_SBI_UI(_name,_elname) \ 219 EXT4_ATTR_OFFSET(_name, 0644, pointer_ui, ext4_sb_info, _elname) 220 221 #define EXT4_RW_ATTR_SBI_UL(_name,_elname) \ 222 EXT4_ATTR_OFFSET(_name, 0644, pointer_ul, ext4_sb_info, _elname) 223 224 #define EXT4_RO_ATTR_SBI_ATOMIC(_name,_elname) \ 225 EXT4_ATTR_OFFSET(_name, 0444, pointer_atomic, ext4_sb_info, _elname) 226 227 #define EXT4_ATTR_PTR(_name,_mode,_id,_ptr) \ 228 static struct ext4_attr ext4_attr_##_name = { \ 229 .attr = {.name = __stringify(_name), .mode = _mode }, \ 230 .attr_id = attr_##_id, \ 231 .attr_ptr = ptr_explicit, \ 232 .u = { \ 233 .explicit_ptr = _ptr, \ 234 }, \ 235 } 236 237 #define ATTR_LIST(name) &ext4_attr_##name.attr 238 239 EXT4_ATTR_FUNC(delayed_allocation_blocks, 0444); 240 EXT4_ATTR_FUNC(session_write_kbytes, 0444); 241 EXT4_ATTR_FUNC(lifetime_write_kbytes, 0444); 242 EXT4_ATTR_FUNC(reserved_clusters, 0644); 243 EXT4_ATTR_FUNC(sra_exceeded_retry_limit, 0444); 244 245 EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, inode_readahead, 246 ext4_sb_info, s_inode_readahead_blks); 247 EXT4_ATTR_OFFSET(mb_group_prealloc, 0644, clusters_in_group, 248 ext4_sb_info, s_mb_group_prealloc); 249 EXT4_ATTR_OFFSET(mb_best_avail_max_trim_order, 0644, mb_order, 250 ext4_sb_info, s_mb_best_avail_max_trim_order); 251 EXT4_ATTR_OFFSET(err_report_sec, 0644, err_report_sec, ext4_sb_info, s_err_report_sec); 252 EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal); 253 EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats); 254 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan); 255 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan); 256 EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs); 257 EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request); 258 EXT4_RW_ATTR_SBI_UI(mb_max_linear_groups, s_mb_max_linear_groups); 259 EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb); 260 EXT4_ATTR(trigger_fs_error, 0200, trigger_test_error); 261 EXT4_RW_ATTR_SBI_PI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval); 262 EXT4_RW_ATTR_SBI_PI(err_ratelimit_burst, s_err_ratelimit_state.burst); 263 EXT4_RW_ATTR_SBI_PI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.interval); 264 EXT4_RW_ATTR_SBI_PI(warning_ratelimit_burst, s_warning_ratelimit_state.burst); 265 EXT4_RW_ATTR_SBI_PI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval); 266 EXT4_RW_ATTR_SBI_PI(msg_ratelimit_burst, s_msg_ratelimit_state.burst); 267 #ifdef CONFIG_EXT4_DEBUG 268 EXT4_RW_ATTR_SBI_UL(simulate_fail, s_simulate_fail); 269 #endif 270 EXT4_RO_ATTR_SBI_ATOMIC(warning_count, s_warning_count); 271 EXT4_RO_ATTR_SBI_ATOMIC(msg_count, s_msg_count); 272 EXT4_RO_ATTR_ES_UI(errors_count, s_error_count); 273 EXT4_RO_ATTR_ES_U8(first_error_errcode, s_first_error_errcode); 274 EXT4_RO_ATTR_ES_U8(last_error_errcode, s_last_error_errcode); 275 EXT4_RO_ATTR_ES_UI(first_error_ino, s_first_error_ino); 276 EXT4_RO_ATTR_ES_UI(last_error_ino, s_last_error_ino); 277 EXT4_RO_ATTR_ES_U64(first_error_block, s_first_error_block); 278 EXT4_RO_ATTR_ES_U64(last_error_block, s_last_error_block); 279 EXT4_RO_ATTR_ES_UI(first_error_line, s_first_error_line); 280 EXT4_RO_ATTR_ES_UI(last_error_line, s_last_error_line); 281 EXT4_RO_ATTR_ES_STRING(first_error_func, s_first_error_func, 32); 282 EXT4_RO_ATTR_ES_STRING(last_error_func, s_last_error_func, 32); 283 EXT4_ATTR(first_error_time, 0444, first_error_time); 284 EXT4_ATTR(last_error_time, 0444, last_error_time); 285 EXT4_ATTR(journal_task, 0444, journal_task); 286 EXT4_RW_ATTR_SBI_UI(mb_prefetch, s_mb_prefetch); 287 EXT4_RW_ATTR_SBI_UI(mb_prefetch_limit, s_mb_prefetch_limit); 288 EXT4_RW_ATTR_SBI_UL(last_trim_minblks, s_last_trim_minblks); 289 EXT4_RW_ATTR_SBI_UI(sb_update_sec, s_sb_update_sec); 290 EXT4_RW_ATTR_SBI_UI(sb_update_kb, s_sb_update_kb); 291 292 static unsigned int old_bump_val = 128; 293 EXT4_ATTR_PTR(max_writeback_mb_bump, 0444, pointer_ui, &old_bump_val); 294 295 static struct attribute *ext4_attrs[] = { 296 ATTR_LIST(delayed_allocation_blocks), 297 ATTR_LIST(session_write_kbytes), 298 ATTR_LIST(lifetime_write_kbytes), 299 ATTR_LIST(reserved_clusters), 300 ATTR_LIST(sra_exceeded_retry_limit), 301 ATTR_LIST(inode_readahead_blks), 302 ATTR_LIST(inode_goal), 303 ATTR_LIST(mb_stats), 304 ATTR_LIST(mb_max_to_scan), 305 ATTR_LIST(mb_min_to_scan), 306 ATTR_LIST(mb_order2_req), 307 ATTR_LIST(mb_stream_req), 308 ATTR_LIST(mb_group_prealloc), 309 ATTR_LIST(mb_max_linear_groups), 310 ATTR_LIST(max_writeback_mb_bump), 311 ATTR_LIST(extent_max_zeroout_kb), 312 ATTR_LIST(trigger_fs_error), 313 ATTR_LIST(err_ratelimit_interval_ms), 314 ATTR_LIST(err_ratelimit_burst), 315 ATTR_LIST(warning_ratelimit_interval_ms), 316 ATTR_LIST(warning_ratelimit_burst), 317 ATTR_LIST(msg_ratelimit_interval_ms), 318 ATTR_LIST(msg_ratelimit_burst), 319 ATTR_LIST(mb_best_avail_max_trim_order), 320 ATTR_LIST(errors_count), 321 ATTR_LIST(warning_count), 322 ATTR_LIST(msg_count), 323 ATTR_LIST(first_error_ino), 324 ATTR_LIST(last_error_ino), 325 ATTR_LIST(first_error_block), 326 ATTR_LIST(last_error_block), 327 ATTR_LIST(first_error_line), 328 ATTR_LIST(last_error_line), 329 ATTR_LIST(first_error_func), 330 ATTR_LIST(last_error_func), 331 ATTR_LIST(first_error_errcode), 332 ATTR_LIST(last_error_errcode), 333 ATTR_LIST(first_error_time), 334 ATTR_LIST(last_error_time), 335 ATTR_LIST(journal_task), 336 #ifdef CONFIG_EXT4_DEBUG 337 ATTR_LIST(simulate_fail), 338 #endif 339 ATTR_LIST(mb_prefetch), 340 ATTR_LIST(mb_prefetch_limit), 341 ATTR_LIST(last_trim_minblks), 342 ATTR_LIST(sb_update_sec), 343 ATTR_LIST(sb_update_kb), 344 ATTR_LIST(err_report_sec), 345 NULL, 346 }; 347 ATTRIBUTE_GROUPS(ext4); 348 349 /* Features this copy of ext4 supports */ 350 EXT4_ATTR_FEATURE(lazy_itable_init); 351 EXT4_ATTR_FEATURE(batched_discard); 352 EXT4_ATTR_FEATURE(meta_bg_resize); 353 #ifdef CONFIG_FS_ENCRYPTION 354 EXT4_ATTR_FEATURE(encryption); 355 EXT4_ATTR_FEATURE(test_dummy_encryption_v2); 356 #endif 357 #if IS_ENABLED(CONFIG_UNICODE) 358 EXT4_ATTR_FEATURE(casefold); 359 #endif 360 #ifdef CONFIG_FS_VERITY 361 EXT4_ATTR_FEATURE(verity); 362 #endif 363 EXT4_ATTR_FEATURE(metadata_csum_seed); 364 EXT4_ATTR_FEATURE(fast_commit); 365 #if IS_ENABLED(CONFIG_UNICODE) && defined(CONFIG_FS_ENCRYPTION) 366 EXT4_ATTR_FEATURE(encrypted_casefold); 367 #endif 368 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 369 EXT4_ATTR_FEATURE(blocksize_gt_pagesize); 370 #endif 371 372 static struct attribute *ext4_feat_attrs[] = { 373 ATTR_LIST(lazy_itable_init), 374 ATTR_LIST(batched_discard), 375 ATTR_LIST(meta_bg_resize), 376 #ifdef CONFIG_FS_ENCRYPTION 377 ATTR_LIST(encryption), 378 ATTR_LIST(test_dummy_encryption_v2), 379 #endif 380 #if IS_ENABLED(CONFIG_UNICODE) 381 ATTR_LIST(casefold), 382 #endif 383 #ifdef CONFIG_FS_VERITY 384 ATTR_LIST(verity), 385 #endif 386 ATTR_LIST(metadata_csum_seed), 387 ATTR_LIST(fast_commit), 388 #if IS_ENABLED(CONFIG_UNICODE) && defined(CONFIG_FS_ENCRYPTION) 389 ATTR_LIST(encrypted_casefold), 390 #endif 391 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 392 ATTR_LIST(blocksize_gt_pagesize), 393 #endif 394 NULL, 395 }; 396 ATTRIBUTE_GROUPS(ext4_feat); 397 398 static void *calc_ptr(struct ext4_attr *a, struct ext4_sb_info *sbi) 399 { 400 switch (a->attr_ptr) { 401 case ptr_explicit: 402 return a->u.explicit_ptr; 403 case ptr_ext4_sb_info_offset: 404 return (void *) (((char *) sbi) + a->u.offset); 405 case ptr_ext4_super_block_offset: 406 return (void *) (((char *) sbi->s_es) + a->u.offset); 407 } 408 return NULL; 409 } 410 411 static ssize_t __print_tstamp(char *buf, __le32 lo, __u8 hi) 412 { 413 return sysfs_emit(buf, "%lld\n", 414 ((time64_t)hi << 32) + le32_to_cpu(lo)); 415 } 416 417 #define print_tstamp(buf, es, tstamp) \ 418 __print_tstamp(buf, (es)->tstamp, (es)->tstamp ## _hi) 419 420 static ssize_t ext4_generic_attr_show(struct ext4_attr *a, 421 struct ext4_sb_info *sbi, char *buf) 422 { 423 void *ptr = calc_ptr(a, sbi); 424 425 if (!ptr) 426 return 0; 427 428 switch (a->attr_id) { 429 case attr_inode_readahead: 430 case attr_clusters_in_group: 431 case attr_mb_order: 432 case attr_pointer_pi: 433 case attr_pointer_ui: 434 if (a->attr_ptr == ptr_ext4_super_block_offset) 435 return sysfs_emit(buf, "%u\n", le32_to_cpup(ptr)); 436 return sysfs_emit(buf, "%u\n", *((unsigned int *) ptr)); 437 case attr_pointer_ul: 438 case attr_err_report_sec: 439 return sysfs_emit(buf, "%lu\n", *((unsigned long *) ptr)); 440 case attr_pointer_u8: 441 return sysfs_emit(buf, "%u\n", *((unsigned char *) ptr)); 442 case attr_pointer_u64: 443 if (a->attr_ptr == ptr_ext4_super_block_offset) 444 return sysfs_emit(buf, "%llu\n", le64_to_cpup(ptr)); 445 return sysfs_emit(buf, "%llu\n", *((unsigned long long *) ptr)); 446 case attr_pointer_string: 447 return sysfs_emit(buf, "%.*s\n", a->attr_size, (char *) ptr); 448 case attr_pointer_atomic: 449 return sysfs_emit(buf, "%d\n", atomic_read((atomic_t *) ptr)); 450 } 451 return 0; 452 } 453 454 static ssize_t ext4_attr_show(struct kobject *kobj, 455 struct attribute *attr, char *buf) 456 { 457 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, 458 s_kobj); 459 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr); 460 461 switch (a->attr_id) { 462 case attr_delayed_allocation_blocks: 463 return sysfs_emit(buf, "%llu\n", 464 (s64) EXT4_C2B(sbi, 465 percpu_counter_sum(&sbi->s_dirtyclusters_counter))); 466 case attr_session_write_kbytes: 467 return session_write_kbytes_show(sbi, buf); 468 case attr_lifetime_write_kbytes: 469 return lifetime_write_kbytes_show(sbi, buf); 470 case attr_reserved_clusters: 471 return sysfs_emit(buf, "%llu\n", 472 (unsigned long long) 473 atomic64_read(&sbi->s_resv_clusters)); 474 case attr_sra_exceeded_retry_limit: 475 return sysfs_emit(buf, "%llu\n", 476 (unsigned long long) 477 percpu_counter_sum(&sbi->s_sra_exceeded_retry_limit)); 478 case attr_feature: 479 return sysfs_emit(buf, "supported\n"); 480 case attr_first_error_time: 481 return print_tstamp(buf, sbi->s_es, s_first_error_time); 482 case attr_last_error_time: 483 return print_tstamp(buf, sbi->s_es, s_last_error_time); 484 case attr_journal_task: 485 return journal_task_show(sbi, buf); 486 default: 487 return ext4_generic_attr_show(a, sbi, buf); 488 } 489 } 490 491 static ssize_t ext4_generic_attr_store(struct ext4_attr *a, 492 struct ext4_sb_info *sbi, 493 const char *buf, size_t len) 494 { 495 int ret; 496 unsigned int t; 497 unsigned long lt; 498 void *ptr = calc_ptr(a, sbi); 499 500 if (!ptr) 501 return 0; 502 503 switch (a->attr_id) { 504 case attr_pointer_pi: 505 ret = kstrtouint(skip_spaces(buf), 0, &t); 506 if (ret) 507 return ret; 508 if ((int)t < 0) 509 return -EINVAL; 510 *((unsigned int *) ptr) = t; 511 return len; 512 case attr_pointer_ui: 513 ret = kstrtouint(skip_spaces(buf), 0, &t); 514 if (ret) 515 return ret; 516 if (a->attr_ptr == ptr_ext4_super_block_offset) 517 *((__le32 *) ptr) = cpu_to_le32(t); 518 else 519 *((unsigned int *) ptr) = t; 520 return len; 521 case attr_mb_order: 522 ret = kstrtouint(skip_spaces(buf), 0, &t); 523 if (ret) 524 return ret; 525 if (t > 64) 526 return -EINVAL; 527 *((unsigned int *) ptr) = t; 528 return len; 529 case attr_clusters_in_group: 530 ret = kstrtouint(skip_spaces(buf), 0, &t); 531 if (ret) 532 return ret; 533 if (t > sbi->s_clusters_per_group) 534 return -EINVAL; 535 *((unsigned int *) ptr) = t; 536 return len; 537 case attr_pointer_ul: 538 ret = kstrtoul(skip_spaces(buf), 0, <); 539 if (ret) 540 return ret; 541 *((unsigned long *) ptr) = lt; 542 return len; 543 } 544 return 0; 545 } 546 547 static ssize_t ext4_attr_store(struct kobject *kobj, 548 struct attribute *attr, 549 const char *buf, size_t len) 550 { 551 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, 552 s_kobj); 553 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr); 554 555 switch (a->attr_id) { 556 case attr_reserved_clusters: 557 return reserved_clusters_store(sbi, buf, len); 558 case attr_inode_readahead: 559 return inode_readahead_blks_store(sbi, buf, len); 560 case attr_trigger_test_error: 561 return trigger_test_error(sbi, buf, len); 562 case attr_err_report_sec: 563 return err_report_sec_store(sbi, buf, len); 564 default: 565 return ext4_generic_attr_store(a, sbi, buf, len); 566 } 567 } 568 569 static void ext4_sb_release(struct kobject *kobj) 570 { 571 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, 572 s_kobj); 573 complete(&sbi->s_kobj_unregister); 574 } 575 576 static void ext4_feat_release(struct kobject *kobj) 577 { 578 kfree(kobj); 579 } 580 581 static const struct sysfs_ops ext4_attr_ops = { 582 .show = ext4_attr_show, 583 .store = ext4_attr_store, 584 }; 585 586 static const struct kobj_type ext4_sb_ktype = { 587 .default_groups = ext4_groups, 588 .sysfs_ops = &ext4_attr_ops, 589 .release = ext4_sb_release, 590 }; 591 592 static const struct kobj_type ext4_feat_ktype = { 593 .default_groups = ext4_feat_groups, 594 .sysfs_ops = &ext4_attr_ops, 595 .release = ext4_feat_release, 596 }; 597 598 void ext4_notify_error_sysfs(struct ext4_sb_info *sbi) 599 { 600 sysfs_notify(&sbi->s_kobj, NULL, "errors_count"); 601 } 602 603 static struct kobject *ext4_root; 604 605 static struct kobject *ext4_feat; 606 607 int ext4_register_sysfs(struct super_block *sb) 608 { 609 struct ext4_sb_info *sbi = EXT4_SB(sb); 610 int err; 611 612 init_completion(&sbi->s_kobj_unregister); 613 err = kobject_init_and_add(&sbi->s_kobj, &ext4_sb_ktype, ext4_root, 614 "%s", sb->s_id); 615 if (err) { 616 kobject_put(&sbi->s_kobj); 617 wait_for_completion(&sbi->s_kobj_unregister); 618 return err; 619 } 620 621 if (ext4_proc_root) 622 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root); 623 if (sbi->s_proc) { 624 proc_create_single_data("options", S_IRUGO, sbi->s_proc, 625 ext4_seq_options_show, sb); 626 proc_create_single_data("es_shrinker_info", S_IRUGO, 627 sbi->s_proc, ext4_seq_es_shrinker_info_show, 628 sb); 629 proc_create_single_data("fc_info", 0444, sbi->s_proc, 630 ext4_fc_info_show, sb); 631 proc_create_seq_data("mb_groups", S_IRUGO, sbi->s_proc, 632 &ext4_mb_seq_groups_ops, sb); 633 proc_create_single_data("mb_stats", 0444, sbi->s_proc, 634 ext4_seq_mb_stats_show, sb); 635 proc_create_seq_data("mb_structs_summary", 0444, sbi->s_proc, 636 &ext4_mb_seq_structs_summary_ops, sb); 637 } 638 return 0; 639 } 640 641 void ext4_unregister_sysfs(struct super_block *sb) 642 { 643 struct ext4_sb_info *sbi = EXT4_SB(sb); 644 645 if (sbi->s_proc) 646 remove_proc_subtree(sb->s_id, ext4_proc_root); 647 kobject_del(&sbi->s_kobj); 648 } 649 650 int __init ext4_init_sysfs(void) 651 { 652 int ret; 653 654 ext4_root = kobject_create_and_add("ext4", fs_kobj); 655 if (!ext4_root) 656 return -ENOMEM; 657 658 ext4_feat = kzalloc(sizeof(*ext4_feat), GFP_KERNEL); 659 if (!ext4_feat) { 660 ret = -ENOMEM; 661 goto root_err; 662 } 663 664 ret = kobject_init_and_add(ext4_feat, &ext4_feat_ktype, 665 ext4_root, "features"); 666 if (ret) 667 goto feat_err; 668 669 ext4_proc_root = proc_mkdir(proc_dirname, NULL); 670 return ret; 671 672 feat_err: 673 kobject_put(ext4_feat); 674 ext4_feat = NULL; 675 root_err: 676 kobject_put(ext4_root); 677 ext4_root = NULL; 678 return ret; 679 } 680 681 void ext4_exit_sysfs(void) 682 { 683 kobject_put(ext4_feat); 684 ext4_feat = NULL; 685 kobject_put(ext4_root); 686 ext4_root = NULL; 687 remove_proc_entry(proc_dirname, NULL); 688 ext4_proc_root = NULL; 689 } 690 691