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Commit 2c63fead authored by Jaegeuk Kim's avatar Jaegeuk Kim
Browse files

f2fs: inject kmalloc failure 



This patch injects kmalloc failure given a fault injection rate.

Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent 73faec4d

fs/f2fs/f2fs.h

+29 −0
Original line number Diff line number Diff line
@@ -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);

}

fs/f2fs/super.c

+6 −0
Original line number Diff line number Diff line
@@ -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");