This patch adds a new entry called fault_injection in /sys/fs/f2fs, and
all injection attributes are placed in this entry. During initializing
f2fs module, these inject attributes are created.
Signed-off-by: Sheng Yong <shengyo...@huawei.com>
---
fs/f2fs/super.c | 65 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 65 insertions(+)
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 069dc44..a9066e4 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -52,6 +52,12 @@ char *fault_name[FAULT_MAX] = {
[FAULT_BLOCK] = "no more block",
[FAULT_DIR_DEPTH] = "too big dir depth",
};
+
+static int f2fs_build_fault_attr(void)
+{
+ memset(&f2fs_fault, 0, sizeof(struct f2fs_fault_info));
+ return 0;
+}
#endif
/* f2fs-wide shrinker description */
@@ -119,6 +125,10 @@ enum {
SM_INFO, /* struct f2fs_sm_info */
NM_INFO, /* struct f2fs_nm_info */
F2FS_SBI, /* struct f2fs_sb_info */
+#ifdef CONFIG_F2FS_FAULT_INJECTION
+ FAULT_INFO_RATE,
+ FAULT_INFO,
+#endif
};
struct f2fs_attr {
@@ -140,6 +150,10 @@ static unsigned char *__struct_ptr(struct f2fs_sb_info
*sbi, int struct_type)
return (unsigned char *)NM_I(sbi);
else if (struct_type == F2FS_SBI)
return (unsigned char *)sbi;
+#ifdef CONFIG_F2FS_FAULT_INJECTION
+ else if (struct_type == FAULT_INFO_RATE || struct_type == FAULT_INFO)
+ return (unsigned char *)&f2fs_fault;
+#endif
return NULL;
}
@@ -189,6 +203,10 @@ static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
ret = kstrtoul(skip_spaces(buf), 0, &t);
if (ret < 0)
return ret;
+#ifdef CONFIG_F2FS_FAULT_INJECTION
+ if (a->struct_type == FAULT_INFO && t > 1)
+ return -EINVAL;
+#endif
*ui = t;
return count;
}
@@ -254,6 +272,15 @@ F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search,
max_victim_search);
F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level);
F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, cp_interval, interval_time[CP_TIME]);
F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, idle_interval, interval_time[REQ_TIME]);
+#ifdef CONFIG_F2FS_FAULT_INJECTION
+F2FS_RW_ATTR(FAULT_INFO_RATE, f2fs_fault_info, inject_rate, inject_rate);
+F2FS_RW_ATTR(FAULT_INFO, f2fs_fault_info, inject_kmalloc, inject_kmalloc);
+F2FS_RW_ATTR(FAULT_INFO, f2fs_fault_info, inject_page_alloc,
inject_page_alloc);
+F2FS_RW_ATTR(FAULT_INFO, f2fs_fault_info, inject_nid_alloc, inject_nid_alloc);
+F2FS_RW_ATTR(FAULT_INFO, f2fs_fault_info, inject_orphan, inject_orphan);
+F2FS_RW_ATTR(FAULT_INFO, f2fs_fault_info, inject_block, inject_block);
+F2FS_RW_ATTR(FAULT_INFO, f2fs_fault_info, inject_dir_depth, inject_dir_depth);
+#endif
F2FS_GENERAL_RO_ATTR(lifetime_write_kbytes);
#define ATTR_LIST(name) (&f2fs_attr_##name.attr)
@@ -290,6 +317,27 @@ static struct kobj_type f2fs_ktype = {
.release = f2fs_sb_release,
};
+#ifdef CONFIG_F2FS_FAULT_INJECTION
+/* sysfs for f2fs fault injection */
+static struct kobject f2fs_fault_inject;
+
+static struct attribute *f2fs_fault_attrs[] = {
+ ATTR_LIST(inject_rate),
+ ATTR_LIST(inject_kmalloc),
+ ATTR_LIST(inject_page_alloc),
+ ATTR_LIST(inject_nid_alloc),
+ ATTR_LIST(inject_orphan),
+ ATTR_LIST(inject_block),
+ ATTR_LIST(inject_dir_depth),
+ NULL
+};
+
+static struct kobj_type f2fs_fault_ktype = {
+ .default_attrs = f2fs_fault_attrs,
+ .sysfs_ops = &f2fs_attr_ops,
+};
+#endif
+
void f2fs_msg(struct super_block *sb, const char *level, const char *fmt, ...)
{
struct va_format vaf;
@@ -1798,6 +1846,16 @@ static int __init init_f2fs_fs(void)
err = -ENOMEM;
goto free_extent_cache;
}
+#ifdef CONFIG_F2FS_FAULT_INJECTION
+ f2fs_fault_inject.kset = f2fs_kset;
+ f2fs_build_fault_attr();
+ err = kobject_init_and_add(&f2fs_fault_inject, &f2fs_fault_ktype,
+ NULL, "fault_injection");
+ if (err) {
+ f2fs_fault_inject.kset = NULL;
+ goto free_kset;
+ }
+#endif
err = register_shrinker(&f2fs_shrinker_info);
if (err)
goto free_kset;
@@ -1816,6 +1874,10 @@ free_filesystem:
free_shrinker:
unregister_shrinker(&f2fs_shrinker_info);
free_kset:
+#ifdef CONFIG_F2FS_FAULT_INJECTION
+ if (f2fs_fault_inject.kset)
+ kobject_put(&f2fs_fault_inject);
+#endif
kset_unregister(f2fs_kset);
free_extent_cache:
destroy_extent_cache();
@@ -1842,6 +1904,9 @@ static void __exit exit_f2fs_fs(void)
destroy_segment_manager_caches();
destroy_node_manager_caches();
destroy_inodecache();
+#ifdef CONFIG_F2FS_FAULT_INJECTION
+ kobject_put(&f2fs_fault_inject);
+#endif
kset_unregister(f2fs_kset);
f2fs_destroy_trace_ios();
}
--
2.7.1
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