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[PATCH] fault injection: process filtering for fault-injection capabilities

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This patch provides process filtering feature.
The process filter allows failing only permitted processes
by /proc/<pid>/make-it-fail

Please see the example that demostrates how to inject slab allocation
failures into module init/cleanup code
in Documentation/fault-injection/fault-injection.txt

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Akinobu Mita 2006-12-08 02:39:47 -08:00 • committed by Linus Torvalds
parent c17bb49517
commit f4f154fd92
4 changed files with 86 additions and 1 deletions
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17
lib/fault-inject.c
View file

@ -5,6 +5,7 @@
#include <linux/types.h>
#include <linux/fs.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/fault-inject.h>
/*
@ -44,6 +45,11 @@ static void fail_dump(struct fault_attr *attr)
#define atomic_dec_not_zero(v) atomic_add_unless((v), -1, 0)
static int fail_task(struct fault_attr *attr, struct task_struct *task)
{
return !in_interrupt() && task->make_it_fail;
}
/*
* This code is stolen from failmalloc-1.0
* http://www.nongnu.org/failmalloc/
@ -51,6 +57,9 @@ static void fail_dump(struct fault_attr *attr)
int should_fail(struct fault_attr *attr, ssize_t size)
{
if (attr->task_filter && !fail_task(attr, current))
return 0;
if (atomic_read(&attr->times) == 0)
return 0;
@ -135,6 +144,9 @@ void cleanup_fault_attr_dentries(struct fault_attr *attr)
debugfs_remove(attr->dentries.verbose_file);
attr->dentries.verbose_file = NULL;
debugfs_remove(attr->dentries.task_filter_file);
attr->dentries.task_filter_file = NULL;
if (attr->dentries.dir)
WARN_ON(!simple_empty(attr->dentries.dir));
@ -169,9 +181,12 @@ int init_fault_attr_dentries(struct fault_attr *attr, const char *name)
attr->dentries.verbose_file =
debugfs_create_ul("verbose", mode, dir, &attr->verbose);
attr->dentries.task_filter_file = debugfs_create_bool("task-filter",
mode, dir, &attr->task_filter);
if (!attr->dentries.probability_file || !attr->dentries.interval_file
|| !attr->dentries.times_file || !attr->dentries.space_file
|| !attr->dentries.verbose_file)
|| !attr->dentries.verbose_file || !attr->dentries.task_filter_file)
goto fail;
return 0;