forked from Minki/linux
f2fs: add fault injection to sysfs
This patch introduces a new struct f2fs_fault_info and a global f2fs_fault to save fault injection status. Fault injection entries are created in /sys/fs/f2fs/fault_injection/ during initializing f2fs module. Signed-off-by: Sheng Yong <shengyong1@huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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b951a4ec16
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087968974f
@ -48,15 +48,36 @@ enum {
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FAULT_MAX,
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};
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extern u32 f2fs_fault_rate;
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extern atomic_t f2fs_ops;
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struct f2fs_fault_info {
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atomic_t inject_ops;
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unsigned int inject_rate;
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unsigned int inject_type;
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};
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extern struct f2fs_fault_info f2fs_fault;
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extern char *fault_name[FAULT_MAX];
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#define IS_FAULT_SET(type) (f2fs_fault.inject_type & (1 << (type)))
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static inline bool time_to_inject(int type)
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{
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atomic_inc(&f2fs_ops);
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if (f2fs_fault_rate && (atomic_read(&f2fs_ops) >= f2fs_fault_rate)) {
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atomic_set(&f2fs_ops, 0);
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if (!f2fs_fault.inject_rate)
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return false;
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if (type == FAULT_KMALLOC && !IS_FAULT_SET(type))
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return false;
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else if (type == FAULT_PAGE_ALLOC && !IS_FAULT_SET(type))
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return false;
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else if (type == FAULT_ALLOC_NID && !IS_FAULT_SET(type))
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return false;
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else if (type == FAULT_ORPHAN && !IS_FAULT_SET(type))
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return false;
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else if (type == FAULT_BLOCK && !IS_FAULT_SET(type))
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return false;
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else if (type == FAULT_DIR_DEPTH && !IS_FAULT_SET(type))
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return false;
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atomic_inc(&f2fs_fault.inject_ops);
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if (atomic_read(&f2fs_fault.inject_ops) >= f2fs_fault.inject_rate) {
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atomic_set(&f2fs_fault.inject_ops, 0);
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printk("%sF2FS-fs : inject %s in %pF\n",
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KERN_INFO,
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fault_name[type],
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@ -40,8 +40,7 @@ static struct kmem_cache *f2fs_inode_cachep;
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static struct kset *f2fs_kset;
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#ifdef CONFIG_F2FS_FAULT_INJECTION
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u32 f2fs_fault_rate = 0;
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atomic_t f2fs_ops;
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struct f2fs_fault_info f2fs_fault;
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char *fault_name[FAULT_MAX] = {
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[FAULT_KMALLOC] = "kmalloc",
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@ -51,6 +50,17 @@ char *fault_name[FAULT_MAX] = {
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[FAULT_BLOCK] = "no more block",
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[FAULT_DIR_DEPTH] = "too big dir depth",
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};
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static void f2fs_build_fault_attr(unsigned int rate)
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{
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if (rate) {
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atomic_set(&f2fs_fault.inject_ops, 0);
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f2fs_fault.inject_rate = rate;
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f2fs_fault.inject_type = (1 << FAULT_MAX) - 1;
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} else {
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memset(&f2fs_fault, 0, sizeof(struct f2fs_fault_info));
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}
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}
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#endif
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/* f2fs-wide shrinker description */
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@ -118,6 +128,10 @@ enum {
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SM_INFO, /* struct f2fs_sm_info */
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NM_INFO, /* struct f2fs_nm_info */
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F2FS_SBI, /* struct f2fs_sb_info */
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#ifdef CONFIG_F2FS_FAULT_INJECTION
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FAULT_INFO_RATE, /* struct f2fs_fault_info */
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FAULT_INFO_TYPE, /* struct f2fs_fault_info */
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#endif
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};
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struct f2fs_attr {
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@ -139,6 +153,11 @@ static unsigned char *__struct_ptr(struct f2fs_sb_info *sbi, int struct_type)
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return (unsigned char *)NM_I(sbi);
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else if (struct_type == F2FS_SBI)
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return (unsigned char *)sbi;
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#ifdef CONFIG_F2FS_FAULT_INJECTION
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else if (struct_type == FAULT_INFO_RATE ||
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struct_type == FAULT_INFO_TYPE)
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return (unsigned char *)&f2fs_fault;
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#endif
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return NULL;
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}
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@ -188,6 +207,10 @@ static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
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ret = kstrtoul(skip_spaces(buf), 0, &t);
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if (ret < 0)
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return ret;
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#ifdef CONFIG_F2FS_FAULT_INJECTION
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if (a->struct_type == FAULT_INFO_TYPE && t >= (1 << FAULT_MAX))
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return -EINVAL;
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#endif
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*ui = t;
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return count;
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}
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@ -253,6 +276,10 @@ F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search);
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F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level);
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F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, cp_interval, interval_time[CP_TIME]);
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F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, idle_interval, interval_time[REQ_TIME]);
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#ifdef CONFIG_F2FS_FAULT_INJECTION
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F2FS_RW_ATTR(FAULT_INFO_RATE, f2fs_fault_info, inject_rate, inject_rate);
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F2FS_RW_ATTR(FAULT_INFO_TYPE, f2fs_fault_info, inject_type, inject_type);
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#endif
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F2FS_GENERAL_RO_ATTR(lifetime_write_kbytes);
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#define ATTR_LIST(name) (&f2fs_attr_##name.attr)
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@ -289,6 +316,22 @@ static struct kobj_type f2fs_ktype = {
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.release = f2fs_sb_release,
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};
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#ifdef CONFIG_F2FS_FAULT_INJECTION
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/* sysfs for f2fs fault injection */
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static struct kobject f2fs_fault_inject;
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static struct attribute *f2fs_fault_attrs[] = {
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ATTR_LIST(inject_rate),
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ATTR_LIST(inject_type),
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NULL
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};
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static struct kobj_type f2fs_fault_ktype = {
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.default_attrs = f2fs_fault_attrs,
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.sysfs_ops = &f2fs_attr_ops,
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};
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#endif
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void f2fs_msg(struct super_block *sb, const char *level, const char *fmt, ...)
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{
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struct va_format vaf;
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@ -317,8 +360,9 @@ static int parse_options(struct super_block *sb, char *options)
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int arg = 0;
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#ifdef CONFIG_F2FS_FAULT_INJECTION
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f2fs_fault_rate = 0;
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f2fs_build_fault_attr(0);
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#endif
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if (!options)
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return 0;
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@ -456,8 +500,7 @@ static int parse_options(struct super_block *sb, char *options)
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if (args->from && match_int(args, &arg))
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return -EINVAL;
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#ifdef CONFIG_F2FS_FAULT_INJECTION
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f2fs_fault_rate = arg;
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atomic_set(&f2fs_ops, 0);
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f2fs_build_fault_attr(arg);
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#else
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f2fs_msg(sb, KERN_INFO,
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"FAULT_INJECTION was not selected");
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@ -1797,6 +1840,16 @@ static int __init init_f2fs_fs(void)
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err = -ENOMEM;
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goto free_extent_cache;
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}
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#ifdef CONFIG_F2FS_FAULT_INJECTION
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f2fs_fault_inject.kset = f2fs_kset;
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f2fs_build_fault_attr(0);
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err = kobject_init_and_add(&f2fs_fault_inject, &f2fs_fault_ktype,
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NULL, "fault_injection");
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if (err) {
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f2fs_fault_inject.kset = NULL;
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goto free_kset;
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}
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#endif
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err = register_shrinker(&f2fs_shrinker_info);
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if (err)
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goto free_kset;
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@ -1815,6 +1868,10 @@ free_filesystem:
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free_shrinker:
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unregister_shrinker(&f2fs_shrinker_info);
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free_kset:
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#ifdef CONFIG_F2FS_FAULT_INJECTION
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if (f2fs_fault_inject.kset)
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kobject_put(&f2fs_fault_inject);
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#endif
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kset_unregister(f2fs_kset);
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free_extent_cache:
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destroy_extent_cache();
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@ -1841,6 +1898,9 @@ static void __exit exit_f2fs_fs(void)
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destroy_segment_manager_caches();
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destroy_node_manager_caches();
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destroy_inodecache();
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#ifdef CONFIG_F2FS_FAULT_INJECTION
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kobject_put(&f2fs_fault_inject);
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#endif
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kset_unregister(f2fs_kset);
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f2fs_destroy_trace_ios();
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}
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