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/f2fs.h b/fs/f2fs/f2fs.h
index ec978b44..1351178 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -48,15 +48,36 @@
FAULT_MAX,
};
-extern u32 f2fs_fault_rate;
-extern atomic_t f2fs_ops;
+struct f2fs_fault_info {
+ atomic_t inject_ops;
+ unsigned int inject_rate;
+ unsigned int inject_type;
+};
+
+extern struct f2fs_fault_info f2fs_fault;
extern char *fault_name[FAULT_MAX];
+#define IS_FAULT_SET(type) (f2fs_fault.inject_type & (1 << (type)))
static inline bool time_to_inject(int type)
{
- atomic_inc(&f2fs_ops);
- if (f2fs_fault_rate && (atomic_read(&f2fs_ops) >= f2fs_fault_rate)) {
- atomic_set(&f2fs_ops, 0);
+ if (!f2fs_fault.inject_rate)
+ return false;
+ if (type == FAULT_KMALLOC && !IS_FAULT_SET(type))
+ return false;
+ else if (type == FAULT_PAGE_ALLOC && !IS_FAULT_SET(type))
+ return false;
+ else if (type == FAULT_ALLOC_NID && !IS_FAULT_SET(type))
+ return false;
+ else if (type == FAULT_ORPHAN && !IS_FAULT_SET(type))
+ return false;
+ else if (type == FAULT_BLOCK && !IS_FAULT_SET(type))
+ return false;
+ else if (type == FAULT_DIR_DEPTH && !IS_FAULT_SET(type))
+ return false;
+
+ atomic_inc(&f2fs_fault.inject_ops);
+ if (atomic_read(&f2fs_fault.inject_ops) >= f2fs_fault.inject_rate) {
+ atomic_set(&f2fs_fault.inject_ops, 0);
printk("%sF2FS-fs : inject %s in %pF\n",
KERN_INFO,
fault_name[type],