// SPDX-License-Identifier: GPL-2.0 /* * linux/fs/ext4/sysfs.c * * Copyright (C) 1992, 1993, 1994, 1995 * Remy Card (card@masi.ibp.fr) * Theodore Ts'o (tytso@mit.edu) * */ #include #include #include #include #include #include #include "ext4.h" #include "ext4_jbd2.h" typedef enum { attr_noop, attr_delayed_allocation_blocks, attr_session_write_kbytes, attr_lifetime_write_kbytes, attr_reserved_clusters, attr_sra_exceeded_retry_limit, attr_inode_readahead, attr_trigger_test_error, attr_first_error_time, attr_last_error_time, attr_feature, attr_pointer_ui, attr_pointer_ul, attr_pointer_u64, attr_pointer_u8, attr_pointer_string, attr_pointer_atomic, attr_journal_task, } attr_id_t; typedef enum { ptr_explicit, ptr_ext4_sb_info_offset, ptr_ext4_super_block_offset, } attr_ptr_t; static const char proc_dirname[] = "fs/ext4"; static struct proc_dir_entry *ext4_proc_root; struct ext4_attr { struct attribute attr; short attr_id; short attr_ptr; unsigned short attr_size; union { int offset; void *explicit_ptr; } u; }; static ssize_t session_write_kbytes_show(struct ext4_sb_info *sbi, char *buf) { struct super_block *sb = sbi->s_buddy_cache->i_sb; if (!sb->s_bdev->bd_part) return snprintf(buf, PAGE_SIZE, "0\n"); return snprintf(buf, PAGE_SIZE, "%lu\n", (part_stat_read(sb->s_bdev->bd_part, sectors[STAT_WRITE]) - sbi->s_sectors_written_start) >> 1); } static ssize_t lifetime_write_kbytes_show(struct ext4_sb_info *sbi, char *buf) { struct super_block *sb = sbi->s_buddy_cache->i_sb; if (!sb->s_bdev->bd_part) return snprintf(buf, PAGE_SIZE, "0\n"); return snprintf(buf, PAGE_SIZE, "%llu\n", (unsigned long long)(sbi->s_kbytes_written + ((part_stat_read(sb->s_bdev->bd_part, sectors[STAT_WRITE]) - EXT4_SB(sb)->s_sectors_written_start) >> 1))); } static ssize_t inode_readahead_blks_store(struct ext4_sb_info *sbi, const char *buf, size_t count) { unsigned long t; int ret; ret = kstrtoul(skip_spaces(buf), 0, &t); if (ret) return ret; if (t && (!is_power_of_2(t) || t > 0x40000000)) return -EINVAL; sbi->s_inode_readahead_blks = t; return count; } static ssize_t reserved_clusters_store(struct ext4_sb_info *sbi, const char *buf, size_t count) { unsigned long long val; ext4_fsblk_t clusters = (ext4_blocks_count(sbi->s_es) >> sbi->s_cluster_bits); int ret; ret = kstrtoull(skip_spaces(buf), 0, &val); if (ret || val >= clusters) return -EINVAL; atomic64_set(&sbi->s_resv_clusters, val); return count; } static ssize_t trigger_test_error(struct ext4_sb_info *sbi, const char *buf, size_t count) { int len = count; if (!capable(CAP_SYS_ADMIN)) return -EPERM; if (len && buf[len-1] == '\n') len--; if (len) ext4_error(sbi->s_sb, "%.*s", len, buf); return count; } static ssize_t journal_task_show(struct ext4_sb_info *sbi, char *buf) { if (!sbi->s_journal) return snprintf(buf, PAGE_SIZE, "\n"); return snprintf(buf, PAGE_SIZE, "%d\n", task_pid_vnr(sbi->s_journal->j_task)); } #define EXT4_ATTR(_name,_mode,_id) \ static struct ext4_attr ext4_attr_##_name = { \ .attr = {.name = __stringify(_name), .mode = _mode }, \ .attr_id = attr_##_id, \ } #define EXT4_ATTR_FUNC(_name,_mode) EXT4_ATTR(_name,_mode,_name) #define EXT4_ATTR_FEATURE(_name) EXT4_ATTR(_name, 0444, feature) #define EXT4_ATTR_OFFSET(_name,_mode,_id,_struct,_elname) \ static struct ext4_attr ext4_attr_##_name = { \ .attr = {.name = __stringify(_name), .mode = _mode }, \ .attr_id = attr_##_id, \ .attr_ptr = ptr_##_struct##_offset, \ .u = { \ .offset = offsetof(struct _struct, _elname),\ }, \ } #define EXT4_ATTR_STRING(_name,_mode,_size,_struct,_elname) \ static struct ext4_attr ext4_attr_##_name = { \ .attr = {.name = __stringify(_name), .mode = _mode }, \ .attr_id = attr_pointer_string, \ .attr_size = _size, \ .attr_ptr = ptr_##_struct##_offset, \ .u = { \ .offset = offsetof(struct _struct, _elname),\ }, \ } #define EXT4_RO_ATTR_ES_UI(_name,_elname) \ EXT4_ATTR_OFFSET(_name, 0444, pointer_ui, ext4_super_block, _elname) #define EXT4_RO_ATTR_ES_U8(_name,_elname) \ EXT4_ATTR_OFFSET(_name, 0444, pointer_u8, ext4_super_block, _elname) #define EXT4_RO_ATTR_ES_U64(_name,_elname) \ EXT4_ATTR_OFFSET(_name, 0444, pointer_u64, ext4_super_block, _elname) #define EXT4_RO_ATTR_ES_STRING(_name,_elname,_size) \ EXT4_ATTR_STRING(_name, 0444, _size, ext4_super_block, _elname) #define EXT4_RW_ATTR_SBI_UI(_name,_elname) \ EXT4_ATTR_OFFSET(_name, 0644, pointer_ui, ext4_sb_info, _elname) #define EXT4_RW_ATTR_SBI_UL(_name,_elname) \ EXT4_ATTR_OFFSET(_name, 0644, pointer_ul, ext4_sb_info, _elname) #define EXT4_RO_ATTR_SBI_ATOMIC(_name,_elname) \ EXT4_ATTR_OFFSET(_name, 0444, pointer_atomic, ext4_sb_info, _elname) #define EXT4_ATTR_PTR(_name,_mode,_id,_ptr) \ static struct ext4_attr ext4_attr_##_name = { \ .attr = {.name = __stringify(_name), .mode = _mode }, \ .attr_id = attr_##_id, \ .attr_ptr = ptr_explicit, \ .u = { \ .explicit_ptr = _ptr, \ }, \ } #define ATTR_LIST(name) &ext4_attr_##name.attr EXT4_ATTR_FUNC(delayed_allocation_blocks, 0444); EXT4_ATTR_FUNC(session_write_kbytes, 0444); EXT4_ATTR_FUNC(lifetime_write_kbytes, 0444); EXT4_ATTR_FUNC(reserved_clusters, 0644); EXT4_ATTR_FUNC(sra_exceeded_retry_limit, 0444); EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, inode_readahead, ext4_sb_info, s_inode_readahead_blks); EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal); EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats); EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan); EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan); EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs); EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request); EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc); EXT4_RW_ATTR_SBI_UI(mb_max_inode_prealloc, s_mb_max_inode_prealloc); EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb); EXT4_ATTR(trigger_fs_error, 0200, trigger_test_error); EXT4_RW_ATTR_SBI_UI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval); EXT4_RW_ATTR_SBI_UI(err_ratelimit_burst, s_err_ratelimit_state.burst); EXT4_RW_ATTR_SBI_UI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.interval); EXT4_RW_ATTR_SBI_UI(warning_ratelimit_burst, s_warning_ratelimit_state.burst); EXT4_RW_ATTR_SBI_UI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval); EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst, s_msg_ratelimit_state.burst); #ifdef CONFIG_EXT4_DEBUG EXT4_RW_ATTR_SBI_UL(simulate_fail, s_simulate_fail); #endif EXT4_RO_ATTR_SBI_ATOMIC(warning_count, s_warning_count); EXT4_RO_ATTR_SBI_ATOMIC(msg_count, s_msg_count); EXT4_RO_ATTR_ES_UI(errors_count, s_error_count); EXT4_RO_ATTR_ES_U8(first_error_errcode, s_first_error_errcode); EXT4_RO_ATTR_ES_U8(last_error_errcode, s_last_error_errcode); EXT4_RO_ATTR_ES_UI(first_error_ino, s_first_error_ino); EXT4_RO_ATTR_ES_UI(last_error_ino, s_last_error_ino); EXT4_RO_ATTR_ES_U64(first_error_block, s_first_error_block); EXT4_RO_ATTR_ES_U64(last_error_block, s_last_error_block); EXT4_RO_ATTR_ES_UI(first_error_line, s_first_error_line); EXT4_RO_ATTR_ES_UI(last_error_line, s_last_error_line); EXT4_RO_ATTR_ES_STRING(first_error_func, s_first_error_func, 32); EXT4_RO_ATTR_ES_STRING(last_error_func, s_last_error_func, 32); EXT4_ATTR(first_error_time, 0444, first_error_time); EXT4_ATTR(last_error_time, 0444, last_error_time); EXT4_ATTR(journal_task, 0444, journal_task); EXT4_RW_ATTR_SBI_UI(mb_prefetch, s_mb_prefetch); EXT4_RW_ATTR_SBI_UI(mb_prefetch_limit, s_mb_prefetch_limit); static unsigned int old_bump_val = 128; EXT4_ATTR_PTR(max_writeback_mb_bump, 0444, pointer_ui, &old_bump_val); static struct attribute *ext4_attrs[] = { ATTR_LIST(delayed_allocation_blocks), ATTR_LIST(session_write_kbytes), ATTR_LIST(lifetime_write_kbytes), ATTR_LIST(reserved_clusters), ATTR_LIST(sra_exceeded_retry_limit), ATTR_LIST(inode_readahead_blks), ATTR_LIST(inode_goal), ATTR_LIST(mb_stats), ATTR_LIST(mb_max_to_scan), ATTR_LIST(mb_min_to_scan), ATTR_LIST(mb_order2_req), ATTR_LIST(mb_stream_req), ATTR_LIST(mb_group_prealloc), ATTR_LIST(mb_max_inode_prealloc), ATTR_LIST(max_writeback_mb_bump), ATTR_LIST(extent_max_zeroout_kb), ATTR_LIST(trigger_fs_error), ATTR_LIST(err_ratelimit_interval_ms), ATTR_LIST(err_ratelimit_burst), ATTR_LIST(warning_ratelimit_interval_ms), ATTR_LIST(warning_ratelimit_burst), ATTR_LIST(msg_ratelimit_interval_ms), ATTR_LIST(msg_ratelimit_burst), ATTR_LIST(errors_count), ATTR_LIST(warning_count), ATTR_LIST(msg_count), ATTR_LIST(first_error_ino), ATTR_LIST(last_error_ino), ATTR_LIST(first_error_block), ATTR_LIST(last_error_block), ATTR_LIST(first_error_line), ATTR_LIST(last_error_line), ATTR_LIST(first_error_func), ATTR_LIST(last_error_func), ATTR_LIST(first_error_errcode), ATTR_LIST(last_error_errcode), ATTR_LIST(first_error_time), ATTR_LIST(last_error_time), ATTR_LIST(journal_task), #ifdef CONFIG_EXT4_DEBUG ATTR_LIST(simulate_fail), #endif ATTR_LIST(mb_prefetch), ATTR_LIST(mb_prefetch_limit), NULL, }; ATTRIBUTE_GROUPS(ext4); /* Features this copy of ext4 supports */ EXT4_ATTR_FEATURE(lazy_itable_init); EXT4_ATTR_FEATURE(batched_discard); EXT4_ATTR_FEATURE(meta_bg_resize); #ifdef CONFIG_FS_ENCRYPTION EXT4_ATTR_FEATURE(encryption); EXT4_ATTR_FEATURE(test_dummy_encryption_v2); #endif #ifdef CONFIG_UNICODE EXT4_ATTR_FEATURE(casefold); #endif #ifdef CONFIG_FS_VERITY EXT4_ATTR_FEATURE(verity); #endif EXT4_ATTR_FEATURE(metadata_csum_seed); EXT4_ATTR_FEATURE(fast_commit); static struct attribute *ext4_feat_attrs[] = { ATTR_LIST(lazy_itable_init), ATTR_LIST(batched_discard), ATTR_LIST(meta_bg_resize), #ifdef CONFIG_FS_ENCRYPTION ATTR_LIST(encryption), ATTR_LIST(test_dummy_encryption_v2), #endif #ifdef CONFIG_UNICODE ATTR_LIST(casefold), #endif #ifdef CONFIG_FS_VERITY ATTR_LIST(verity), #endif ATTR_LIST(metadata_csum_seed), ATTR_LIST(fast_commit), NULL, }; ATTRIBUTE_GROUPS(ext4_feat); static void *calc_ptr(struct ext4_attr *a, struct ext4_sb_info *sbi) { switch (a->attr_ptr) { case ptr_explicit: return a->u.explicit_ptr; case ptr_ext4_sb_info_offset: return (void *) (((char *) sbi) + a->u.offset); case ptr_ext4_super_block_offset: return (void *) (((char *) sbi->s_es) + a->u.offset); } return NULL; } static ssize_t __print_tstamp(char *buf, __le32 lo, __u8 hi) { return snprintf(buf, PAGE_SIZE, "%lld\n", ((time64_t)hi << 32) + le32_to_cpu(lo)); } #define print_tstamp(buf, es, tstamp) \ __print_tstamp(buf, (es)->tstamp, (es)->tstamp ## _hi) static ssize_t ext4_attr_show(struct kobject *kobj, struct attribute *attr, char *buf) { struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, s_kobj); struct ext4_attr *a = container_of(attr, struct ext4_attr, attr); void *ptr = calc_ptr(a, sbi); switch (a->attr_id) { case attr_delayed_allocation_blocks: return snprintf(buf, PAGE_SIZE, "%llu\n", (s64) EXT4_C2B(sbi, percpu_counter_sum(&sbi->s_dirtyclusters_counter))); case attr_session_write_kbytes: return session_write_kbytes_show(sbi, buf); case attr_lifetime_write_kbytes: return lifetime_write_kbytes_show(sbi, buf); case attr_reserved_clusters: return snprintf(buf, PAGE_SIZE, "%llu\n", (unsigned long long) atomic64_read(&sbi->s_resv_clusters)); case attr_sra_exceeded_retry_limit: return snprintf(buf, PAGE_SIZE, "%llu\n", (unsigned long long) percpu_counter_sum(&sbi->s_sra_exceeded_retry_limit)); case attr_inode_readahead: case attr_pointer_ui: if (!ptr) return 0; if (a->attr_ptr == ptr_ext4_super_block_offset) return snprintf(buf, PAGE_SIZE, "%u\n", le32_to_cpup(ptr)); else return snprintf(buf, PAGE_SIZE, "%u\n", *((unsigned int *) ptr)); case attr_pointer_ul: if (!ptr) return 0; return snprintf(buf, PAGE_SIZE, "%lu\n", *((unsigned long *) ptr)); case attr_pointer_u8: if (!ptr) return 0; return snprintf(buf, PAGE_SIZE, "%u\n", *((unsigned char *) ptr)); case attr_pointer_u64: if (!ptr) return 0; if (a->attr_ptr == ptr_ext4_super_block_offset) return snprintf(buf, PAGE_SIZE, "%llu\n", le64_to_cpup(ptr)); else return snprintf(buf, PAGE_SIZE, "%llu\n", *((unsigned long long *) ptr)); case attr_pointer_string: if (!ptr) return 0; return snprintf(buf, PAGE_SIZE, "%.*s\n", a->attr_size, (char *) ptr); case attr_pointer_atomic: if (!ptr) return 0; return snprintf(buf, PAGE_SIZE, "%d\n", atomic_read((atomic_t *) ptr)); case attr_feature: return snprintf(buf, PAGE_SIZE, "supported\n"); case attr_first_error_time: return print_tstamp(buf, sbi->s_es, s_first_error_time); case attr_last_error_time: return print_tstamp(buf, sbi->s_es, s_last_error_time); case attr_journal_task: return journal_task_show(sbi, buf); } return 0; } static ssize_t ext4_attr_store(struct kobject *kobj, struct attribute *attr, const char *buf, size_t len) { struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, s_kobj); struct ext4_attr *a = container_of(attr, struct ext4_attr, attr); void *ptr = calc_ptr(a, sbi); unsigned long t; int ret; switch (a->attr_id) { case attr_reserved_clusters: return reserved_clusters_store(sbi, buf, len); case attr_pointer_ui: if (!ptr) return 0; ret = kstrtoul(skip_spaces(buf), 0, &t); if (ret) return ret; if (a->attr_ptr == ptr_ext4_super_block_offset) *((__le32 *) ptr) = cpu_to_le32(t); else *((unsigned int *) ptr) = t; return len; case attr_pointer_ul: if (!ptr) return 0; ret = kstrtoul(skip_spaces(buf), 0, &t); if (ret) return ret; *((unsigned long *) ptr) = t; return len; case attr_inode_readahead: return inode_readahead_blks_store(sbi, buf, len); case attr_trigger_test_error: return trigger_test_error(sbi, buf, len); } return 0; } static void ext4_sb_release(struct kobject *kobj) { struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, s_kobj); complete(&sbi->s_kobj_unregister); } static void ext4_feat_release(struct kobject *kobj) { kfree(kobj); } static const struct sysfs_ops ext4_attr_ops = { .show = ext4_attr_show, .store = ext4_attr_store, }; static struct kobj_type ext4_sb_ktype = { .default_groups = ext4_groups, .sysfs_ops = &ext4_attr_ops, .release = ext4_sb_release, }; static struct kobj_type ext4_feat_ktype = { .default_groups = ext4_feat_groups, .sysfs_ops = &ext4_attr_ops, .release = ext4_feat_release, }; static struct kobject *ext4_root; static struct kobject *ext4_feat; int ext4_register_sysfs(struct super_block *sb) { struct ext4_sb_info *sbi = EXT4_SB(sb); int err; init_completion(&sbi->s_kobj_unregister); err = kobject_init_and_add(&sbi->s_kobj, &ext4_sb_ktype, ext4_root, "%s", sb->s_id); if (err) { kobject_put(&sbi->s_kobj); wait_for_completion(&sbi->s_kobj_unregister); return err; } if (ext4_proc_root) sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root); if (sbi->s_proc) { proc_create_single_data("options", S_IRUGO, sbi->s_proc, ext4_seq_options_show, sb); proc_create_single_data("es_shrinker_info", S_IRUGO, sbi->s_proc, ext4_seq_es_shrinker_info_show, sb); proc_create_single_data("fc_info", 0444, sbi->s_proc, ext4_fc_info_show, sb); proc_create_seq_data("mb_groups", S_IRUGO, sbi->s_proc, &ext4_mb_seq_groups_ops, sb); proc_create_single_data("mb_stats", 0444, sbi->s_proc, ext4_seq_mb_stats_show, sb); } return 0; } void ext4_unregister_sysfs(struct super_block *sb) { struct ext4_sb_info *sbi = EXT4_SB(sb); if (sbi->s_proc) remove_proc_subtree(sb->s_id, ext4_proc_root); kobject_del(&sbi->s_kobj); } int __init ext4_init_sysfs(void) { int ret; ext4_root = kobject_create_and_add("ext4", fs_kobj); if (!ext4_root) return -ENOMEM; ext4_feat = kzalloc(sizeof(*ext4_feat), GFP_KERNEL); if (!ext4_feat) { ret = -ENOMEM; goto root_err; } ret = kobject_init_and_add(ext4_feat, &ext4_feat_ktype, ext4_root, "features"); if (ret) goto feat_err; ext4_proc_root = proc_mkdir(proc_dirname, NULL); return ret; feat_err: kobject_put(ext4_feat); ext4_feat = NULL; root_err: kobject_put(ext4_root); ext4_root = NULL; return ret; } void ext4_exit_sysfs(void) { kobject_put(ext4_feat); ext4_feat = NULL; kobject_put(ext4_root); ext4_root = NULL; remove_proc_entry(proc_dirname, NULL); ext4_proc_root = NULL; }