diff options
| author | Jaegeuk Kim <jaegeuk@kernel.org> | 2016-04-29 15:49:56 -0700 |
|---|---|---|
| committer | Mister Oyster <oysterized@gmail.com> | 2017-04-13 12:33:25 +0200 |
| commit | cf5e3f58637310620c59bdbde876eda7449baa00 (patch) | |
| tree | 18147dc7e0008c519a32187f48b36cb00ea6eaf7 | |
| parent | d5b3ebbd9d2f589e51709e6f665f8af7b76ae2be (diff) | |
f2fs: inject kmalloc failure
This patch injects kmalloc failure given a fault injection rate.
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
| -rw-r--r-- | fs/f2fs/f2fs.h | 29 | ||||
| -rw-r--r-- | fs/f2fs/super.c | 6 |
2 files changed, 35 insertions, 0 deletions
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index c36675ea5..1e9a83ee1 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -38,6 +38,31 @@ } 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 */ @@ -1685,6 +1710,10 @@ 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 fc82c1efd..311e9d2a3 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 */ @@ -446,6 +451,7 @@ 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"); |