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![Christoph Hellwig](/assets/img/avatar_default.png)
Use struct block_device to lookup partitions on a disk. This removes all usage of struct hd_struct from the I/O path. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jan Kara <jack@suse.cz> Reviewed-by: Hannes Reinecke <hare@suse.de> Acked-by: Coly Li <colyli@suse.de> [bcache] Acked-by: Chao Yu <yuchao0@huawei.com> [f2fs] Signed-off-by: Jens Axboe <axboe@kernel.dk>
577 lines
16 KiB
C
577 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/fs/ext4/sysfs.c
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*
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* Copyright (C) 1992, 1993, 1994, 1995
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* Remy Card (card@masi.ibp.fr)
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* Theodore Ts'o (tytso@mit.edu)
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*
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*/
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#include <linux/time.h>
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#include <linux/fs.h>
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#include <linux/seq_file.h>
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#include <linux/slab.h>
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#include <linux/proc_fs.h>
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#include <linux/part_stat.h>
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#include "ext4.h"
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#include "ext4_jbd2.h"
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typedef enum {
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attr_noop,
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attr_delayed_allocation_blocks,
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attr_session_write_kbytes,
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attr_lifetime_write_kbytes,
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attr_reserved_clusters,
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attr_inode_readahead,
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attr_trigger_test_error,
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attr_first_error_time,
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attr_last_error_time,
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attr_feature,
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attr_pointer_ui,
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attr_pointer_ul,
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attr_pointer_u64,
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attr_pointer_u8,
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attr_pointer_string,
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attr_pointer_atomic,
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attr_journal_task,
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} attr_id_t;
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typedef enum {
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ptr_explicit,
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ptr_ext4_sb_info_offset,
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ptr_ext4_super_block_offset,
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} attr_ptr_t;
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static const char proc_dirname[] = "fs/ext4";
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static struct proc_dir_entry *ext4_proc_root;
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struct ext4_attr {
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struct attribute attr;
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short attr_id;
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short attr_ptr;
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unsigned short attr_size;
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union {
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int offset;
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void *explicit_ptr;
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} u;
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};
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static ssize_t session_write_kbytes_show(struct ext4_sb_info *sbi, char *buf)
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{
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struct super_block *sb = sbi->s_buddy_cache->i_sb;
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return snprintf(buf, PAGE_SIZE, "%lu\n",
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(part_stat_read(sb->s_bdev, sectors[STAT_WRITE]) -
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sbi->s_sectors_written_start) >> 1);
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}
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static ssize_t lifetime_write_kbytes_show(struct ext4_sb_info *sbi, char *buf)
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{
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struct super_block *sb = sbi->s_buddy_cache->i_sb;
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return snprintf(buf, PAGE_SIZE, "%llu\n",
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(unsigned long long)(sbi->s_kbytes_written +
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((part_stat_read(sb->s_bdev, sectors[STAT_WRITE]) -
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EXT4_SB(sb)->s_sectors_written_start) >> 1)));
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}
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static ssize_t inode_readahead_blks_store(struct ext4_sb_info *sbi,
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const char *buf, size_t count)
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{
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unsigned long t;
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int ret;
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ret = kstrtoul(skip_spaces(buf), 0, &t);
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if (ret)
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return ret;
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if (t && (!is_power_of_2(t) || t > 0x40000000))
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return -EINVAL;
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sbi->s_inode_readahead_blks = t;
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return count;
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}
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static ssize_t reserved_clusters_store(struct ext4_sb_info *sbi,
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const char *buf, size_t count)
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{
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unsigned long long val;
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ext4_fsblk_t clusters = (ext4_blocks_count(sbi->s_es) >>
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sbi->s_cluster_bits);
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int ret;
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ret = kstrtoull(skip_spaces(buf), 0, &val);
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if (ret || val >= clusters)
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return -EINVAL;
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atomic64_set(&sbi->s_resv_clusters, val);
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return count;
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}
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static ssize_t trigger_test_error(struct ext4_sb_info *sbi,
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const char *buf, size_t count)
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{
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int len = count;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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if (len && buf[len-1] == '\n')
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len--;
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if (len)
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ext4_error(sbi->s_sb, "%.*s", len, buf);
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return count;
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}
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static ssize_t journal_task_show(struct ext4_sb_info *sbi, char *buf)
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{
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if (!sbi->s_journal)
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return snprintf(buf, PAGE_SIZE, "<none>\n");
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return snprintf(buf, PAGE_SIZE, "%d\n",
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task_pid_vnr(sbi->s_journal->j_task));
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}
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#define EXT4_ATTR(_name,_mode,_id) \
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static struct ext4_attr ext4_attr_##_name = { \
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.attr = {.name = __stringify(_name), .mode = _mode }, \
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.attr_id = attr_##_id, \
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}
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#define EXT4_ATTR_FUNC(_name,_mode) EXT4_ATTR(_name,_mode,_name)
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#define EXT4_ATTR_FEATURE(_name) EXT4_ATTR(_name, 0444, feature)
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#define EXT4_ATTR_OFFSET(_name,_mode,_id,_struct,_elname) \
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static struct ext4_attr ext4_attr_##_name = { \
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.attr = {.name = __stringify(_name), .mode = _mode }, \
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.attr_id = attr_##_id, \
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.attr_ptr = ptr_##_struct##_offset, \
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.u = { \
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.offset = offsetof(struct _struct, _elname),\
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}, \
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}
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#define EXT4_ATTR_STRING(_name,_mode,_size,_struct,_elname) \
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static struct ext4_attr ext4_attr_##_name = { \
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.attr = {.name = __stringify(_name), .mode = _mode }, \
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.attr_id = attr_pointer_string, \
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.attr_size = _size, \
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.attr_ptr = ptr_##_struct##_offset, \
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.u = { \
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.offset = offsetof(struct _struct, _elname),\
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}, \
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}
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#define EXT4_RO_ATTR_ES_UI(_name,_elname) \
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EXT4_ATTR_OFFSET(_name, 0444, pointer_ui, ext4_super_block, _elname)
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#define EXT4_RO_ATTR_ES_U8(_name,_elname) \
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EXT4_ATTR_OFFSET(_name, 0444, pointer_u8, ext4_super_block, _elname)
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#define EXT4_RO_ATTR_ES_U64(_name,_elname) \
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EXT4_ATTR_OFFSET(_name, 0444, pointer_u64, ext4_super_block, _elname)
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#define EXT4_RO_ATTR_ES_STRING(_name,_elname,_size) \
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EXT4_ATTR_STRING(_name, 0444, _size, ext4_super_block, _elname)
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#define EXT4_RW_ATTR_SBI_UI(_name,_elname) \
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EXT4_ATTR_OFFSET(_name, 0644, pointer_ui, ext4_sb_info, _elname)
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#define EXT4_RW_ATTR_SBI_UL(_name,_elname) \
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EXT4_ATTR_OFFSET(_name, 0644, pointer_ul, ext4_sb_info, _elname)
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#define EXT4_RO_ATTR_SBI_ATOMIC(_name,_elname) \
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EXT4_ATTR_OFFSET(_name, 0444, pointer_atomic, ext4_sb_info, _elname)
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#define EXT4_ATTR_PTR(_name,_mode,_id,_ptr) \
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static struct ext4_attr ext4_attr_##_name = { \
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.attr = {.name = __stringify(_name), .mode = _mode }, \
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.attr_id = attr_##_id, \
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.attr_ptr = ptr_explicit, \
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.u = { \
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.explicit_ptr = _ptr, \
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}, \
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}
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#define ATTR_LIST(name) &ext4_attr_##name.attr
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EXT4_ATTR_FUNC(delayed_allocation_blocks, 0444);
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EXT4_ATTR_FUNC(session_write_kbytes, 0444);
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EXT4_ATTR_FUNC(lifetime_write_kbytes, 0444);
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EXT4_ATTR_FUNC(reserved_clusters, 0644);
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EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, inode_readahead,
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ext4_sb_info, s_inode_readahead_blks);
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EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
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EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
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EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
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EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
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EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
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EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
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EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
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EXT4_RW_ATTR_SBI_UI(mb_max_inode_prealloc, s_mb_max_inode_prealloc);
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EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
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EXT4_ATTR(trigger_fs_error, 0200, trigger_test_error);
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EXT4_RW_ATTR_SBI_UI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval);
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EXT4_RW_ATTR_SBI_UI(err_ratelimit_burst, s_err_ratelimit_state.burst);
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EXT4_RW_ATTR_SBI_UI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.interval);
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EXT4_RW_ATTR_SBI_UI(warning_ratelimit_burst, s_warning_ratelimit_state.burst);
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EXT4_RW_ATTR_SBI_UI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval);
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EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst, s_msg_ratelimit_state.burst);
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#ifdef CONFIG_EXT4_DEBUG
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EXT4_RW_ATTR_SBI_UL(simulate_fail, s_simulate_fail);
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#endif
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EXT4_RO_ATTR_SBI_ATOMIC(warning_count, s_warning_count);
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EXT4_RO_ATTR_SBI_ATOMIC(msg_count, s_msg_count);
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EXT4_RO_ATTR_ES_UI(errors_count, s_error_count);
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EXT4_RO_ATTR_ES_U8(first_error_errcode, s_first_error_errcode);
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EXT4_RO_ATTR_ES_U8(last_error_errcode, s_last_error_errcode);
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EXT4_RO_ATTR_ES_UI(first_error_ino, s_first_error_ino);
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EXT4_RO_ATTR_ES_UI(last_error_ino, s_last_error_ino);
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EXT4_RO_ATTR_ES_U64(first_error_block, s_first_error_block);
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EXT4_RO_ATTR_ES_U64(last_error_block, s_last_error_block);
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EXT4_RO_ATTR_ES_UI(first_error_line, s_first_error_line);
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EXT4_RO_ATTR_ES_UI(last_error_line, s_last_error_line);
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EXT4_RO_ATTR_ES_STRING(first_error_func, s_first_error_func, 32);
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EXT4_RO_ATTR_ES_STRING(last_error_func, s_last_error_func, 32);
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EXT4_ATTR(first_error_time, 0444, first_error_time);
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EXT4_ATTR(last_error_time, 0444, last_error_time);
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EXT4_ATTR(journal_task, 0444, journal_task);
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EXT4_RW_ATTR_SBI_UI(mb_prefetch, s_mb_prefetch);
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EXT4_RW_ATTR_SBI_UI(mb_prefetch_limit, s_mb_prefetch_limit);
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static unsigned int old_bump_val = 128;
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EXT4_ATTR_PTR(max_writeback_mb_bump, 0444, pointer_ui, &old_bump_val);
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static struct attribute *ext4_attrs[] = {
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ATTR_LIST(delayed_allocation_blocks),
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ATTR_LIST(session_write_kbytes),
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ATTR_LIST(lifetime_write_kbytes),
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ATTR_LIST(reserved_clusters),
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ATTR_LIST(inode_readahead_blks),
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ATTR_LIST(inode_goal),
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ATTR_LIST(mb_stats),
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ATTR_LIST(mb_max_to_scan),
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ATTR_LIST(mb_min_to_scan),
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ATTR_LIST(mb_order2_req),
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ATTR_LIST(mb_stream_req),
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ATTR_LIST(mb_group_prealloc),
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ATTR_LIST(mb_max_inode_prealloc),
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ATTR_LIST(max_writeback_mb_bump),
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ATTR_LIST(extent_max_zeroout_kb),
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ATTR_LIST(trigger_fs_error),
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ATTR_LIST(err_ratelimit_interval_ms),
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ATTR_LIST(err_ratelimit_burst),
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ATTR_LIST(warning_ratelimit_interval_ms),
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ATTR_LIST(warning_ratelimit_burst),
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ATTR_LIST(msg_ratelimit_interval_ms),
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ATTR_LIST(msg_ratelimit_burst),
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ATTR_LIST(errors_count),
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ATTR_LIST(warning_count),
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ATTR_LIST(msg_count),
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ATTR_LIST(first_error_ino),
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ATTR_LIST(last_error_ino),
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ATTR_LIST(first_error_block),
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ATTR_LIST(last_error_block),
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ATTR_LIST(first_error_line),
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ATTR_LIST(last_error_line),
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ATTR_LIST(first_error_func),
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ATTR_LIST(last_error_func),
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ATTR_LIST(first_error_errcode),
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ATTR_LIST(last_error_errcode),
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ATTR_LIST(first_error_time),
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ATTR_LIST(last_error_time),
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ATTR_LIST(journal_task),
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#ifdef CONFIG_EXT4_DEBUG
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ATTR_LIST(simulate_fail),
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#endif
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ATTR_LIST(mb_prefetch),
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ATTR_LIST(mb_prefetch_limit),
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NULL,
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};
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ATTRIBUTE_GROUPS(ext4);
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/* Features this copy of ext4 supports */
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EXT4_ATTR_FEATURE(lazy_itable_init);
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EXT4_ATTR_FEATURE(batched_discard);
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EXT4_ATTR_FEATURE(meta_bg_resize);
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#ifdef CONFIG_FS_ENCRYPTION
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EXT4_ATTR_FEATURE(encryption);
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EXT4_ATTR_FEATURE(test_dummy_encryption_v2);
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#endif
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#ifdef CONFIG_UNICODE
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EXT4_ATTR_FEATURE(casefold);
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#endif
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#ifdef CONFIG_FS_VERITY
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EXT4_ATTR_FEATURE(verity);
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#endif
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EXT4_ATTR_FEATURE(metadata_csum_seed);
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EXT4_ATTR_FEATURE(fast_commit);
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static struct attribute *ext4_feat_attrs[] = {
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ATTR_LIST(lazy_itable_init),
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ATTR_LIST(batched_discard),
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ATTR_LIST(meta_bg_resize),
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#ifdef CONFIG_FS_ENCRYPTION
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ATTR_LIST(encryption),
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ATTR_LIST(test_dummy_encryption_v2),
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#endif
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#ifdef CONFIG_UNICODE
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ATTR_LIST(casefold),
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#endif
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#ifdef CONFIG_FS_VERITY
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ATTR_LIST(verity),
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#endif
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ATTR_LIST(metadata_csum_seed),
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ATTR_LIST(fast_commit),
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NULL,
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};
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ATTRIBUTE_GROUPS(ext4_feat);
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static void *calc_ptr(struct ext4_attr *a, struct ext4_sb_info *sbi)
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{
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switch (a->attr_ptr) {
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case ptr_explicit:
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return a->u.explicit_ptr;
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case ptr_ext4_sb_info_offset:
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return (void *) (((char *) sbi) + a->u.offset);
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case ptr_ext4_super_block_offset:
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return (void *) (((char *) sbi->s_es) + a->u.offset);
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}
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return NULL;
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}
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static ssize_t __print_tstamp(char *buf, __le32 lo, __u8 hi)
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{
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return snprintf(buf, PAGE_SIZE, "%lld\n",
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((time64_t)hi << 32) + le32_to_cpu(lo));
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}
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#define print_tstamp(buf, es, tstamp) \
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__print_tstamp(buf, (es)->tstamp, (es)->tstamp ## _hi)
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static ssize_t ext4_attr_show(struct kobject *kobj,
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struct attribute *attr, char *buf)
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{
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struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
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s_kobj);
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struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
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void *ptr = calc_ptr(a, sbi);
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switch (a->attr_id) {
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case attr_delayed_allocation_blocks:
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return snprintf(buf, PAGE_SIZE, "%llu\n",
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(s64) EXT4_C2B(sbi,
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percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
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case attr_session_write_kbytes:
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return session_write_kbytes_show(sbi, buf);
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case attr_lifetime_write_kbytes:
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return lifetime_write_kbytes_show(sbi, buf);
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case attr_reserved_clusters:
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return snprintf(buf, PAGE_SIZE, "%llu\n",
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(unsigned long long)
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atomic64_read(&sbi->s_resv_clusters));
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case attr_inode_readahead:
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case attr_pointer_ui:
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if (!ptr)
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return 0;
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if (a->attr_ptr == ptr_ext4_super_block_offset)
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return snprintf(buf, PAGE_SIZE, "%u\n",
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le32_to_cpup(ptr));
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else
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return snprintf(buf, PAGE_SIZE, "%u\n",
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*((unsigned int *) ptr));
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case attr_pointer_ul:
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if (!ptr)
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return 0;
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return snprintf(buf, PAGE_SIZE, "%lu\n",
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*((unsigned long *) ptr));
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case attr_pointer_u8:
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if (!ptr)
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return 0;
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return snprintf(buf, PAGE_SIZE, "%u\n",
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*((unsigned char *) ptr));
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case attr_pointer_u64:
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if (!ptr)
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return 0;
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if (a->attr_ptr == ptr_ext4_super_block_offset)
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return snprintf(buf, PAGE_SIZE, "%llu\n",
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le64_to_cpup(ptr));
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else
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return snprintf(buf, PAGE_SIZE, "%llu\n",
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*((unsigned long long *) ptr));
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case attr_pointer_string:
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if (!ptr)
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return 0;
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return snprintf(buf, PAGE_SIZE, "%.*s\n", a->attr_size,
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(char *) ptr);
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case attr_pointer_atomic:
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if (!ptr)
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return 0;
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return snprintf(buf, PAGE_SIZE, "%d\n",
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atomic_read((atomic_t *) ptr));
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case attr_feature:
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return snprintf(buf, PAGE_SIZE, "supported\n");
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case attr_first_error_time:
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return print_tstamp(buf, sbi->s_es, s_first_error_time);
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case attr_last_error_time:
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return print_tstamp(buf, sbi->s_es, s_last_error_time);
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case attr_journal_task:
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return journal_task_show(sbi, buf);
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}
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return 0;
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}
|
|
|
|
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 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 = (void (*)(struct kobject *))kfree,
|
|
};
|
|
|
|
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);
|
|
}
|
|
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;
|
|
}
|
|
|