diff options
author | Ingo Molnar <mingo@elte.hu> | 2008-12-31 08:19:48 +0100 |
---|---|---|
committer | Ingo Molnar <mingo@elte.hu> | 2008-12-31 08:19:48 +0100 |
commit | 818fa7f3908c7bd6c0045e9d94dc23a899ef6144 (patch) | |
tree | ad3435c3f57c8222ad61709b716168932f13be6c /mm/failslab.c | |
parent | 3fd4bc015ef879a7d2b955ce97fb125e3a51ba7e (diff) | |
parent | 5fdf7e5975a0b0f6a0370655612c5dca3fd6311b (diff) | |
download | op-kernel-dev-818fa7f3908c7bd6c0045e9d94dc23a899ef6144.zip op-kernel-dev-818fa7f3908c7bd6c0045e9d94dc23a899ef6144.tar.gz |
Merge branch 'tracing/kmemtrace' into tracing/kmemtrace2
Diffstat (limited to 'mm/failslab.c')
-rw-r--r-- | mm/failslab.c | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/mm/failslab.c b/mm/failslab.c new file mode 100644 index 0000000..7c6ea64 --- /dev/null +++ b/mm/failslab.c @@ -0,0 +1,59 @@ +#include <linux/fault-inject.h> + +static struct { + struct fault_attr attr; + u32 ignore_gfp_wait; +#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS + struct dentry *ignore_gfp_wait_file; +#endif +} failslab = { + .attr = FAULT_ATTR_INITIALIZER, + .ignore_gfp_wait = 1, +}; + +bool should_failslab(size_t size, gfp_t gfpflags) +{ + if (gfpflags & __GFP_NOFAIL) + return false; + + if (failslab.ignore_gfp_wait && (gfpflags & __GFP_WAIT)) + return false; + + return should_fail(&failslab.attr, size); +} + +static int __init setup_failslab(char *str) +{ + return setup_fault_attr(&failslab.attr, str); +} +__setup("failslab=", setup_failslab); + +#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS + +static int __init failslab_debugfs_init(void) +{ + mode_t mode = S_IFREG | S_IRUSR | S_IWUSR; + struct dentry *dir; + int err; + + err = init_fault_attr_dentries(&failslab.attr, "failslab"); + if (err) + return err; + dir = failslab.attr.dentries.dir; + + failslab.ignore_gfp_wait_file = + debugfs_create_bool("ignore-gfp-wait", mode, dir, + &failslab.ignore_gfp_wait); + + if (!failslab.ignore_gfp_wait_file) { + err = -ENOMEM; + debugfs_remove(failslab.ignore_gfp_wait_file); + cleanup_fault_attr_dentries(&failslab.attr); + } + + return err; +} + +late_initcall(failslab_debugfs_init); + +#endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */ |