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f2fs: inject kmalloc failure 

This patch injects kmalloc failure given a fault injection rate.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
steinar/wifi_calib_4_9_kernel
Jaegeuk Kim 2016-04-29 15:49:56 -07:00
parent 73faec4d99
commit 2c63fead9e
2 changed files with 35 additions and 0 deletions
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29
fs/f2fs/f2fs.h
View File

@ -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);
}

6
fs/f2fs/super.c
View File

@ -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");