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

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>

include/linux/fault-inject.h

@@ -17,6 +17,7 @@ struct fault_attr {
 	atomic_t times;
 	atomic_t space;
 	unsigned long verbose;
+	u32 task_filter;
 
 	unsigned long count;
 
@@ -30,6 +31,7 @@ struct fault_attr {
 		struct dentry *times_file;
 		struct dentry *space_file;
 		struct dentry *verbose_file;
+		struct dentry *task_filter_file;
 	} dentries;
 
 #endif