git://bbs.cooldavid.org / net-next-2.6.git / blame
| Commit | Line | Data |
|---|---|---|
| 773ff60e | 1 | #include <linux/fault-inject.h> |
| 255d11bc | 2 | #include <linux/gfp.h> |
| 773ff60e AM |
3 | |
| 4 | static struct { | |
| 5 | struct fault_attr attr; | |
| 6 | u32 ignore_gfp_wait; | |
| 7 | #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS | |
| 8 | struct dentry *ignore_gfp_wait_file; | |
| 9 | #endif | |
| 10 | } failslab = { | |
| 11 | .attr = FAULT_ATTR_INITIALIZER, | |
| 12 | .ignore_gfp_wait = 1, | |
| 13 | }; | |
| 14 | ||
| 15 | bool should_failslab(size_t size, gfp_t gfpflags) | |
| 16 | { | |
| 17 | if (gfpflags & __GFP_NOFAIL) | |
| 18 | return false; | |
| 19 | ||
| 20 | if (failslab.ignore_gfp_wait && (gfpflags & __GFP_WAIT)) | |
| 21 | return false; | |
| 22 | ||
| 23 | return should_fail(&failslab.attr, size); | |
| 24 | } | |
| 25 | ||
| 26 | static int __init setup_failslab(char *str) | |
| 27 | { | |
| 28 | return setup_fault_attr(&failslab.attr, str); | |
| 29 | } | |
| 30 | __setup("failslab=", setup_failslab); | |
| 31 | ||
| 32 | #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS | |
| 33 | ||
| 34 | static int __init failslab_debugfs_init(void) | |
| 35 | { | |
| 36 | mode_t mode = S_IFREG | S_IRUSR | S_IWUSR; | |
| 37 | struct dentry *dir; | |
| 38 | int err; | |
| 39 | ||
| 40 | err = init_fault_attr_dentries(&failslab.attr, "failslab"); | |
| 41 | if (err) | |
| 42 | return err; | |
| 43 | dir = failslab.attr.dentries.dir; | |
| 44 | ||
| 45 | failslab.ignore_gfp_wait_file = | |
| 46 | debugfs_create_bool("ignore-gfp-wait", mode, dir, | |
| 47 | &failslab.ignore_gfp_wait); | |
| 48 | ||
| 49 | if (!failslab.ignore_gfp_wait_file) { | |
| 50 | err = -ENOMEM; | |
| 51 | debugfs_remove(failslab.ignore_gfp_wait_file); | |
| 52 | cleanup_fault_attr_dentries(&failslab.attr); | |
| 53 | } | |
| 54 | ||
| 55 | return err; | |
| 56 | } | |
| 57 | ||
| 58 | late_initcall(failslab_debugfs_init); | |
| 59 | ||
| 60 | #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */ |