[PATCH] fault-injection capabilities infrastructure

This patch provides base functions implement to fault-injection
capabilities.

- The function should_fail() is taken from failmalloc-1.0
  (http://www.nongnu.org/failmalloc/)

[akpm@osdl.org: cleanups, comments, add __init]
Cc: <okuji@enbug.org>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Don Mullis <dwm@meer.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/include/linux/fault-inject.h b/include/linux/fault-inject.h
new file mode 100644 (file)
index 0000000..4df4902
--- /dev/null
+++ b/include/linux/fault-inject.h
@@ -0,0 +1,69 @@
+#ifndef _LINUX_FAULT_INJECT_H
+#define _LINUX_FAULT_INJECT_H
+
+#ifdef CONFIG_FAULT_INJECTION
+
+#include <linux/types.h>
+#include <linux/debugfs.h>
+#include <asm/atomic.h>
+
+/*
+ * For explanation of the elements of this struct, see
+ * Documentation/fault-injection/fault-injection.txt
+ */
+struct fault_attr {
+       unsigned long probability;
+       unsigned long interval;
+       atomic_t times;
+       atomic_t space;
+       unsigned long verbose;
+
+       unsigned long count;
+
+#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
+
+       struct {
+               struct dentry *dir;
+
+               struct dentry *probability_file;
+               struct dentry *interval_file;
+               struct dentry *times_file;
+               struct dentry *space_file;
+               struct dentry *verbose_file;
+       } dentries;
+
+#endif
+};
+
+#define FAULT_ATTR_INITIALIZER {                               \
+               .interval = 1,                                  \
+               .times = ATOMIC_INIT(1),                        \
+       }
+
+#define DECLARE_FAULT_ATTR(name) struct fault_attr name = FAULT_ATTR_INITIALIZER
+int setup_fault_attr(struct fault_attr *attr, char *str);
+void should_fail_srandom(unsigned long entropy);
+int should_fail(struct fault_attr *attr, ssize_t size);
+
+#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
+
+int init_fault_attr_dentries(struct fault_attr *attr, const char *name);
+void cleanup_fault_attr_dentries(struct fault_attr *attr);
+
+#else /* CONFIG_FAULT_INJECTION_DEBUG_FS */
+
+static inline int init_fault_attr_dentries(struct fault_attr *attr,
+                                         const char *name)
+{
+       return -ENODEV;
+}
+
+static inline void cleanup_fault_attr_dentries(struct fault_attr *attr)
+{
+}
+
+#endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */
+
+#endif /* CONFIG_FAULT_INJECTION */
+
+#endif /* _LINUX_FAULT_INJECT_H */

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 2c133c0..35228b3 100644 (file)
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -413,3 +413,15 @@ config LKDTM
 
        Documentation on how to use the module can be found in
        drivers/misc/lkdtm.c
+
+config FAULT_INJECTION
+       bool
+
+config FAULT_INJECTION_DEBUG_FS
+       bool "Debugfs entries for fault-injection capabilities"
+       depends on FAULT_INJECTION && SYSFS
+       select DEBUG_FS
+       help
+         This option enable configuration of fault-injection capabilities via
+         debugfs.
+

diff --git a/lib/Makefile b/lib/Makefile
index 6f675c6..2d6106a 100644 (file)
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -55,6 +55,7 @@ obj-$(CONFIG_SMP) += percpu_counter.o
 obj-$(CONFIG_AUDIT_GENERIC) += audit.o
 
 obj-$(CONFIG_SWIOTLB) += swiotlb.o
+obj-$(CONFIG_FAULT_INJECTION) += fault-inject.o
 
 lib-$(CONFIG_GENERIC_BUG) += bug.o
 

diff --git a/lib/fault-inject.c b/lib/fault-inject.c
new file mode 100644 (file)
index 0000000..a7cb3af
--- /dev/null
+++ b/lib/fault-inject.c
@@ -0,0 +1,183 @@
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/random.h>
+#include <linux/stat.h>
+#include <linux/types.h>
+#include <linux/fs.h>
+#include <linux/module.h>
+#include <linux/fault-inject.h>
+
+/*
+ * setup_fault_attr() is a helper function for various __setup handlers, so it
+ * returns 0 on error, because that is what __setup handlers do.
+ */
+int __init setup_fault_attr(struct fault_attr *attr, char *str)
+{
+       unsigned long probability;
+       unsigned long interval;
+       int times;
+       int space;
+
+       /* "<interval>,<probability>,<space>,<times>" */
+       if (sscanf(str, "%lu,%lu,%d,%d",
+                       &interval, &probability, &space, &times) < 4) {
+               printk(KERN_WARNING
+                       "FAULT_INJECTION: failed to parse arguments\n");
+               return 0;
+       }
+
+       attr->probability = probability;
+       attr->interval = interval;
+       atomic_set(&attr->times, times);
+       atomic_set(&attr->space, space);
+
+       return 1;
+}
+
+static void fail_dump(struct fault_attr *attr)
+{
+       if (attr->verbose > 0)
+               printk(KERN_NOTICE "FAULT_INJECTION: forcing a failure\n");
+       if (attr->verbose > 1)
+               dump_stack();
+}
+
+#define atomic_dec_not_zero(v)         atomic_add_unless((v), -1, 0)
+
+/*
+ * This code is stolen from failmalloc-1.0
+ * http://www.nongnu.org/failmalloc/
+ */
+
+int should_fail(struct fault_attr *attr, ssize_t size)
+{
+       if (atomic_read(&attr->times) == 0)
+               return 0;
+
+       if (atomic_read(&attr->space) > size) {
+               atomic_sub(size, &attr->space);
+               return 0;
+       }
+
+       if (attr->interval > 1) {
+               attr->count++;
+               if (attr->count % attr->interval)
+                       return 0;
+       }
+
+       if (attr->probability > random32() % 100)
+               goto fail;
+
+       return 0;
+
+fail:
+       fail_dump(attr);
+
+       if (atomic_read(&attr->times) != -1)
+               atomic_dec_not_zero(&attr->times);
+
+       return 1;
+}
+
+#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
+
+static void debugfs_ul_set(void *data, u64 val)
+{
+       *(unsigned long *)data = val;
+}
+
+static u64 debugfs_ul_get(void *data)
+{
+       return *(unsigned long *)data;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(fops_ul, debugfs_ul_get, debugfs_ul_set, "%llu\n");
+
+static struct dentry *debugfs_create_ul(const char *name, mode_t mode,
+                               struct dentry *parent, unsigned long *value)
+{
+       return debugfs_create_file(name, mode, parent, value, &fops_ul);
+}
+
+static void debugfs_atomic_t_set(void *data, u64 val)
+{
+       atomic_set((atomic_t *)data, val);
+}
+
+static u64 debugfs_atomic_t_get(void *data)
+{
+       return atomic_read((atomic_t *)data);
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(fops_atomic_t, debugfs_atomic_t_get,
+                       debugfs_atomic_t_set, "%lld\n");
+
+static struct dentry *debugfs_create_atomic_t(const char *name, mode_t mode,
+                               struct dentry *parent, atomic_t *value)
+{
+       return debugfs_create_file(name, mode, parent, value, &fops_atomic_t);
+}
+
+void cleanup_fault_attr_dentries(struct fault_attr *attr)
+{
+       debugfs_remove(attr->dentries.probability_file);
+       attr->dentries.probability_file = NULL;
+
+       debugfs_remove(attr->dentries.interval_file);
+       attr->dentries.interval_file = NULL;
+
+       debugfs_remove(attr->dentries.times_file);
+       attr->dentries.times_file = NULL;
+
+       debugfs_remove(attr->dentries.space_file);
+       attr->dentries.space_file = NULL;
+
+       debugfs_remove(attr->dentries.verbose_file);
+       attr->dentries.verbose_file = NULL;
+
+       if (attr->dentries.dir)
+               WARN_ON(!simple_empty(attr->dentries.dir));
+
+       debugfs_remove(attr->dentries.dir);
+       attr->dentries.dir = NULL;
+}
+
+int init_fault_attr_dentries(struct fault_attr *attr, const char *name)
+{
+       mode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
+       struct dentry *dir;
+
+       memset(&attr->dentries, 0, sizeof(attr->dentries));
+
+       dir = debugfs_create_dir(name, NULL);
+       if (!dir)
+               goto fail;
+       attr->dentries.dir = dir;
+
+       attr->dentries.probability_file =
+               debugfs_create_ul("probability", mode, dir, &attr->probability);
+
+       attr->dentries.interval_file =
+               debugfs_create_ul("interval", mode, dir, &attr->interval);
+
+       attr->dentries.times_file =
+               debugfs_create_atomic_t("times", mode, dir, &attr->times);
+
+       attr->dentries.space_file =
+               debugfs_create_atomic_t("space", mode, dir, &attr->space);
+
+       attr->dentries.verbose_file =
+               debugfs_create_ul("verbose", mode, dir, &attr->verbose);
+
+       if (!attr->dentries.probability_file || !attr->dentries.interval_file
+           || !attr->dentries.times_file || !attr->dentries.space_file
+           || !attr->dentries.verbose_file)
+               goto fail;
+
+       return 0;
+fail:
+       cleanup_fault_attr_dentries(attr);
+       return -ENOMEM;
+}
+
+#endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */