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![Ojaswin Mujoo](/assets/img/avatar_default.png)
mballoc criterias have historically been called by numbers like CR0, CR1... however this makes it confusing to understand what each criteria is about. Change these criterias from numbers to symbolic names and add relevant comments. While we are at it, also reformat and add some comments to ext4_seq_mb_stats_show() for better readability. Additionally, define CR_FAST which signifies the criteria below which we can make quicker decisions like: * quitting early if (free block < requested len) * avoiding to scan free extents smaller than required len. * avoiding to initialize buddy cache and work with existing cache * limiting prefetches Suggested-by: Jan Kara <jack@suse.cz> Signed-off-by: Ojaswin Mujoo <ojaswin@linux.ibm.com> Link: https://lore.kernel.org/r/a2dc6ec5aea5e5e68cf8e788c2a964ffead9c8b0.1685449706.git.ojaswin@linux.ibm.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
608 lines
17 KiB
C
608 lines
17 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_sra_exceeded_retry_limit,
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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 sysfs_emit(buf, "%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 sysfs_emit(buf, "%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 sysfs_emit(buf, "<none>\n");
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return sysfs_emit(buf, "%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_FUNC(sra_exceeded_retry_limit, 0444);
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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_linear_groups, s_mb_max_linear_groups);
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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_RW_ATTR_SBI_UI(mb_best_avail_max_trim_order, s_mb_best_avail_max_trim_order);
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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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EXT4_RW_ATTR_SBI_UL(last_trim_minblks, s_last_trim_minblks);
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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(sra_exceeded_retry_limit),
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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_linear_groups),
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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(mb_best_avail_max_trim_order),
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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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ATTR_LIST(last_trim_minblks),
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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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#if IS_ENABLED(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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#if IS_ENABLED(CONFIG_UNICODE) && defined(CONFIG_FS_ENCRYPTION)
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EXT4_ATTR_FEATURE(encrypted_casefold);
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#endif
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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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#if IS_ENABLED(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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#if IS_ENABLED(CONFIG_UNICODE) && defined(CONFIG_FS_ENCRYPTION)
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ATTR_LIST(encrypted_casefold),
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#endif
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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 sysfs_emit(buf, "%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 sysfs_emit(buf, "%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 sysfs_emit(buf, "%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_sra_exceeded_retry_limit:
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return sysfs_emit(buf, "%llu\n",
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(unsigned long long)
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percpu_counter_sum(&sbi->s_sra_exceeded_retry_limit));
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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 sysfs_emit(buf, "%u\n",
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le32_to_cpup(ptr));
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else
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return sysfs_emit(buf, "%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 sysfs_emit(buf, "%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 sysfs_emit(buf, "%u\n",
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*((unsigned char *) ptr));
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|
case attr_pointer_u64:
|
|
if (!ptr)
|
|
return 0;
|
|
if (a->attr_ptr == ptr_ext4_super_block_offset)
|
|
return sysfs_emit(buf, "%llu\n",
|
|
le64_to_cpup(ptr));
|
|
else
|
|
return sysfs_emit(buf, "%llu\n",
|
|
*((unsigned long long *) ptr));
|
|
case attr_pointer_string:
|
|
if (!ptr)
|
|
return 0;
|
|
return sysfs_emit(buf, "%.*s\n", a->attr_size,
|
|
(char *) ptr);
|
|
case attr_pointer_atomic:
|
|
if (!ptr)
|
|
return 0;
|
|
return sysfs_emit(buf, "%d\n",
|
|
atomic_read((atomic_t *) ptr));
|
|
case attr_feature:
|
|
return sysfs_emit(buf, "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 const struct kobj_type ext4_sb_ktype = {
|
|
.default_groups = ext4_groups,
|
|
.sysfs_ops = &ext4_attr_ops,
|
|
.release = ext4_sb_release,
|
|
};
|
|
|
|
static const struct kobj_type ext4_feat_ktype = {
|
|
.default_groups = ext4_feat_groups,
|
|
.sysfs_ops = &ext4_attr_ops,
|
|
.release = ext4_feat_release,
|
|
};
|
|
|
|
void ext4_notify_error_sysfs(struct ext4_sb_info *sbi)
|
|
{
|
|
sysfs_notify(&sbi->s_kobj, NULL, "errors_count");
|
|
}
|
|
|
|
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);
|
|
proc_create_seq_data("mb_structs_summary", 0444, sbi->s_proc,
|
|
&ext4_mb_seq_structs_summary_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;
|
|
}
|
|
|