From 8e4bff4cab0ddac6060645b0715210484d02ff40 Mon Sep 17 00:00:00 2001 From: Yuval Adam <_@yuv.al> Date: Wed, 30 Aug 2017 08:25:59 +0000 Subject: Initial file dump from open source release --- mm/failslab.c | 60 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+) create mode 100644 mm/failslab.c (limited to 'mm/failslab.c') diff --git a/mm/failslab.c b/mm/failslab.c new file mode 100644 index 00000000..fefaabaa --- /dev/null +++ b/mm/failslab.c @@ -0,0 +1,60 @@ +#include +#include + +static struct { + struct fault_attr attr; + u32 ignore_gfp_wait; + int cache_filter; +} failslab = { + .attr = FAULT_ATTR_INITIALIZER, + .ignore_gfp_wait = 1, + .cache_filter = 0, +}; + +bool should_failslab(size_t size, gfp_t gfpflags, unsigned long cache_flags) +{ + if (gfpflags & __GFP_NOFAIL) + return false; + + if (failslab.ignore_gfp_wait && (gfpflags & __GFP_WAIT)) + return false; + + if (failslab.cache_filter && !(cache_flags & SLAB_FAILSLAB)) + 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) +{ + struct dentry *dir; + umode_t mode = S_IFREG | S_IRUSR | S_IWUSR; + + dir = fault_create_debugfs_attr("failslab", NULL, &failslab.attr); + if (IS_ERR(dir)) + return PTR_ERR(dir); + + if (!debugfs_create_bool("ignore-gfp-wait", mode, dir, + &failslab.ignore_gfp_wait)) + goto fail; + if (!debugfs_create_bool("cache-filter", mode, dir, + &failslab.cache_filter)) + goto fail; + + return 0; +fail: + debugfs_remove_recursive(dir); + + return -ENOMEM; +} + +late_initcall(failslab_debugfs_init); + +#endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */ -- cgit v1.3.1