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| author | Jaegeuk Kim <jaegeuk@kernel.org> | 2016-04-29 15:49:56 -0700 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2016-05-07 10:32:22 -0700 |
| commit | 2c63fead9e372b3b65d1883bb174df6c9820f1dd (patch) | |
| tree | 885acae64bc6daf3c08ea10403b0bb36109b9a76 /fs/f2fs | |
| parent | 73faec4d99358b79815866dd660ae2f9f6f9110a (diff) | |
| download | linux-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.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 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"); |