forked from luck/tmp_suning_uos_patched
6a0678a79b
The inode timestamps use 34 bits in ext4, but the various timestamps in the superblock are limited to 32 bits. If every user accesses these as 'unsigned', then this is good until year 2106, but it seems better to extend this a bit further in the process of removing the deprecated get_seconds() function. This adds another byte for each timestamp in the superblock, making them long enough to store timestamps beyond what is in the inodes, which seems good enough here (in ocfs2, they are already 64-bit wide, which is appropriate for a new layout). I did not modify e2fsprogs, which obviously needs the same change to actually interpret future timestamps correctly. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
449 lines
12 KiB
C
449 lines
12 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 "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_atomic,
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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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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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if (!sb->s_bdev->bd_part)
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return snprintf(buf, PAGE_SIZE, "0\n");
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return snprintf(buf, PAGE_SIZE, "%lu\n",
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(part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
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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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if (!sb->s_bdev->bd_part)
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return snprintf(buf, PAGE_SIZE, "0\n");
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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->bd_part, sectors[1]) -
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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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#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_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_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_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(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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EXT4_RO_ATTR_ES_UI(errors_count, s_error_count);
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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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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(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(first_error_time),
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ATTR_LIST(last_error_time),
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NULL,
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};
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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_EXT4_FS_ENCRYPTION
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EXT4_ATTR_FEATURE(encryption);
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#endif
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EXT4_ATTR_FEATURE(metadata_csum_seed);
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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_EXT4_FS_ENCRYPTION
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ATTR_LIST(encryption),
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#endif
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ATTR_LIST(metadata_csum_seed),
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NULL,
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};
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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",
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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_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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}
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return 0;
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}
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static ssize_t ext4_attr_store(struct kobject *kobj,
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struct attribute *attr,
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const char *buf, size_t len)
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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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unsigned long t;
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int ret;
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switch (a->attr_id) {
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case attr_reserved_clusters:
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return reserved_clusters_store(sbi, buf, len);
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case attr_pointer_ui:
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if (!ptr)
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return 0;
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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 (a->attr_ptr == ptr_ext4_super_block_offset)
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*((__le32 *) ptr) = cpu_to_le32(t);
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else
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*((unsigned int *) ptr) = t;
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return len;
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case attr_inode_readahead:
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return inode_readahead_blks_store(sbi, buf, len);
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case attr_trigger_test_error:
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return trigger_test_error(sbi, buf, len);
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}
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return 0;
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}
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static void ext4_sb_release(struct kobject *kobj)
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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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complete(&sbi->s_kobj_unregister);
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}
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static const struct sysfs_ops ext4_attr_ops = {
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.show = ext4_attr_show,
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.store = ext4_attr_store,
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};
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static struct kobj_type ext4_sb_ktype = {
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.default_attrs = ext4_attrs,
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.sysfs_ops = &ext4_attr_ops,
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.release = ext4_sb_release,
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};
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static struct kobj_type ext4_feat_ktype = {
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.default_attrs = ext4_feat_attrs,
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.sysfs_ops = &ext4_attr_ops,
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.release = (void (*)(struct kobject *))kfree,
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};
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static struct kobject *ext4_root;
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static struct kobject *ext4_feat;
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int ext4_register_sysfs(struct super_block *sb)
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{
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struct ext4_sb_info *sbi = EXT4_SB(sb);
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int err;
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init_completion(&sbi->s_kobj_unregister);
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err = kobject_init_and_add(&sbi->s_kobj, &ext4_sb_ktype, ext4_root,
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"%s", sb->s_id);
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if (err) {
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kobject_put(&sbi->s_kobj);
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wait_for_completion(&sbi->s_kobj_unregister);
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return err;
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}
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if (ext4_proc_root)
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sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
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if (sbi->s_proc) {
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proc_create_single_data("options", S_IRUGO, sbi->s_proc,
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ext4_seq_options_show, sb);
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proc_create_single_data("es_shrinker_info", S_IRUGO,
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sbi->s_proc, ext4_seq_es_shrinker_info_show,
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sb);
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proc_create_seq_data("mb_groups", S_IRUGO, sbi->s_proc,
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&ext4_mb_seq_groups_ops, sb);
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}
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return 0;
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}
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void ext4_unregister_sysfs(struct super_block *sb)
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{
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struct ext4_sb_info *sbi = EXT4_SB(sb);
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if (sbi->s_proc)
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remove_proc_subtree(sb->s_id, ext4_proc_root);
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kobject_del(&sbi->s_kobj);
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}
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int __init ext4_init_sysfs(void)
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{
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int ret;
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ext4_root = kobject_create_and_add("ext4", fs_kobj);
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if (!ext4_root)
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return -ENOMEM;
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ext4_feat = kzalloc(sizeof(*ext4_feat), GFP_KERNEL);
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if (!ext4_feat) {
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ret = -ENOMEM;
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goto root_err;
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}
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ret = kobject_init_and_add(ext4_feat, &ext4_feat_ktype,
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ext4_root, "features");
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if (ret)
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goto feat_err;
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ext4_proc_root = proc_mkdir(proc_dirname, NULL);
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return ret;
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feat_err:
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kobject_put(ext4_feat);
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ext4_feat = NULL;
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root_err:
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kobject_put(ext4_root);
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ext4_root = NULL;
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return ret;
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}
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void ext4_exit_sysfs(void)
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{
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kobject_put(ext4_feat);
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ext4_feat = NULL;
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kobject_put(ext4_root);
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ext4_root = NULL;
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remove_proc_entry(proc_dirname, NULL);
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ext4_proc_root = NULL;
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}
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