This patch injects kmalloc failure given a fault injection rate.
Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
---
fs/f2fs/f2fs.h | 29 +++++++++++++++++++++++++++++
fs/f2fs/super.c | 6 ++++++
2 files changed, 35 insertions(+)
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 0684d3e..60098df 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -37,6 +37,31 @@
} while (0)
#endif
+#ifdef CONFIG_F2FS_FAULT_INJECTION
+enum {
+ FAULT_KMALLOC,
+ FAULT_MAX,
+};
+
+extern u32 f2fs_fault_rate;
+extern atomic_t f2fs_ops;
+extern char *fault_name[FAULT_MAX];
+
+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);
+ printk("%sF2FS-fs : inject %s in %pF\n",
+ KERN_INFO,
+ fault_name[type],
+ __builtin_return_address(0));
+ return true;
+ }
+ return false;
+}
+#endif
+
/*
* For mount options
*/
@@ -1646,6 +1671,10 @@ static inline bool f2fs_may_extent_tree(struct inode *inode)
static inline void *f2fs_kmalloc(size_t size, gfp_t flags)
{
+#ifdef CONFIG_F2FS_FAULT_INJECTION
+ if (time_to_inject(FAULT_KMALLOC))
+ return NULL;
+#endif
return kmalloc(size, flags);
}
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index b27febd..76f4d2c 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -41,6 +41,11 @@ static struct kset *f2fs_kset;
#ifdef CONFIG_F2FS_FAULT_INJECTION
u32 f2fs_fault_rate = 0;
+atomic_t f2fs_ops;
+
+char *fault_name[FAULT_MAX] = {
+ [FAULT_KMALLOC] = "kmalloc",
+};
#endif
/* f2fs-wide shrinker description */
@@ -444,6 +449,7 @@ static int parse_options(struct super_block *sb, char *options)
return -EINVAL;
#ifdef CONFIG_F2FS_FAULT_INJECTION
f2fs_fault_rate = arg;
+ atomic_set(&f2fs_ops, 0);
#else
f2fs_msg(sb, KERN_INFO,
"FAULT_INJECTION was not selected");
--
2.6.3
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