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>
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 0e54e84..9df6d72 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -40,8 +40,7 @@
static struct kset *f2fs_kset;
#ifdef CONFIG_F2FS_FAULT_INJECTION
-u32 f2fs_fault_rate = 0;
-atomic_t f2fs_ops;
+struct f2fs_fault_info f2fs_fault;
char *fault_name[FAULT_MAX] = {
[FAULT_KMALLOC] = "kmalloc",
@@ -51,6 +50,17 @@
[FAULT_BLOCK] = "no more block",
[FAULT_DIR_DEPTH] = "too big dir depth",
};
+
+static void f2fs_build_fault_attr(unsigned int rate)
+{
+ if (rate) {
+ atomic_set(&f2fs_fault.inject_ops, 0);
+ f2fs_fault.inject_rate = rate;
+ f2fs_fault.inject_type = (1 << FAULT_MAX) - 1;
+ } else {
+ memset(&f2fs_fault, 0, sizeof(struct f2fs_fault_info));
+ }
+}
#endif
/* f2fs-wide shrinker description */
@@ -118,6 +128,10 @@
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, /* struct f2fs_fault_info */
+ FAULT_INFO_TYPE, /* struct f2fs_fault_info */
+#endif
};
struct f2fs_attr {
@@ -139,6 +153,11 @@
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_TYPE)
+ return (unsigned char *)&f2fs_fault;
+#endif
return NULL;
}
@@ -188,6 +207,10 @@
ret = kstrtoul(skip_spaces(buf), 0, &t);
if (ret < 0)
return ret;
+#ifdef CONFIG_F2FS_FAULT_INJECTION
+ if (a->struct_type == FAULT_INFO_TYPE && t >= (1 << FAULT_MAX))
+ return -EINVAL;
+#endif
*ui = t;
return count;
}
@@ -253,6 +276,10 @@
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_TYPE, f2fs_fault_info, inject_type, inject_type);
+#endif
F2FS_GENERAL_RO_ATTR(lifetime_write_kbytes);
#define ATTR_LIST(name) (&f2fs_attr_##name.attr)
@@ -289,6 +316,22 @@
.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_type),
+ 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;
@@ -317,8 +360,9 @@
int arg = 0;
#ifdef CONFIG_F2FS_FAULT_INJECTION
- f2fs_fault_rate = 0;
+ f2fs_build_fault_attr(0);
#endif
+
if (!options)
return 0;
@@ -456,8 +500,7 @@
if (args->from && match_int(args, &arg))
return -EINVAL;
#ifdef CONFIG_F2FS_FAULT_INJECTION
- f2fs_fault_rate = arg;
- atomic_set(&f2fs_ops, 0);
+ f2fs_build_fault_attr(arg);
#else
f2fs_msg(sb, KERN_INFO,
"FAULT_INJECTION was not selected");
@@ -1797,6 +1840,16 @@
err = -ENOMEM;
goto free_extent_cache;
}
+#ifdef CONFIG_F2FS_FAULT_INJECTION
+ f2fs_fault_inject.kset = f2fs_kset;
+ f2fs_build_fault_attr(0);
+ 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;
@@ -1815,6 +1868,10 @@
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();
@@ -1841,6 +1898,9 @@
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();
}