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authorJaegeuk Kim <jaegeuk@kernel.org>2016-04-29 15:49:56 -0700
committerJaegeuk Kim <jaegeuk@kernel.org>2016-05-07 10:32:22 -0700
commit2c63fead9e372b3b65d1883bb174df6c9820f1dd (patch)
tree885acae64bc6daf3c08ea10403b0bb36109b9a76 /fs/f2fs
parent73faec4d99358b79815866dd660ae2f9f6f9110a (diff)
downloadlinux-2c63fead9e372b3b65d1883bb174df6c9820f1dd.tar.bz2
f2fs: inject kmalloc failure
This patch injects kmalloc failure given a fault injection rate. Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs')
-rw-r--r--fs/f2fs/f2fs.h29
-rw-r--r--fs/f2fs/super.c6
2 files changed, 35 insertions, 0 deletions
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 0cf2a26388e5..cf03c57d0feb 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
*/
@@ -1647,6 +1672,10 @@ 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 22348791700f..9a56f544da3e 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 */
@@ -447,6 +452,7 @@ 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");