linux-stable/include/linux/fault-inject.h
Akinobu Mita dd48c085c1 fault-injection: add ability to export fault_attr in arbitrary directory
init_fault_attr_dentries() is used to export fault_attr via debugfs.
But it can only export it in debugfs root directory.

Per Forlin is working on mmc_fail_request which adds support to inject
data errors after a completed host transfer in MMC subsystem.

The fault_attr for mmc_fail_request should be defined per mmc host and
export it in debugfs directory per mmc host like
/sys/kernel/debug/mmc0/mmc_fail_request.

init_fault_attr_dentries() doesn't help for mmc_fail_request.  So this
introduces fault_create_debugfs_attr() which is able to create a
directory in the arbitrary directory and replace
init_fault_attr_dentries().

[akpm@linux-foundation.org: extraneous semicolon, per Randy]
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Tested-by: Per Forlin <per.forlin@linaro.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Christoph Lameter <cl@linux-foundation.org>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Matt Mackall <mpm@selenic.com>
Cc: Randy Dunlap <rdunlap@xenotime.net>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-08-03 14:25:20 -10:00

69 lines
1.7 KiB
C

#ifndef _LINUX_FAULT_INJECT_H
#define _LINUX_FAULT_INJECT_H
#ifdef CONFIG_FAULT_INJECTION
#include <linux/types.h>
#include <linux/debugfs.h>
#include <linux/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;
u32 task_filter;
unsigned long stacktrace_depth;
unsigned long require_start;
unsigned long require_end;
unsigned long reject_start;
unsigned long reject_end;
unsigned long count;
};
#define FAULT_ATTR_INITIALIZER { \
.interval = 1, \
.times = ATOMIC_INIT(1), \
.require_end = ULONG_MAX, \
.stacktrace_depth = 32, \
.verbose = 2, \
}
#define DECLARE_FAULT_ATTR(name) struct fault_attr name = FAULT_ATTR_INITIALIZER
int setup_fault_attr(struct fault_attr *attr, char *str);
bool should_fail(struct fault_attr *attr, ssize_t size);
#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
struct dentry *fault_create_debugfs_attr(const char *name,
struct dentry *parent, struct fault_attr *attr);
#else /* CONFIG_FAULT_INJECTION_DEBUG_FS */
static inline struct dentry *fault_create_debugfs_attr(const char *name,
struct dentry *parent, struct fault_attr *attr)
{
return ERR_PTR(-ENODEV);
}
#endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */
#endif /* CONFIG_FAULT_INJECTION */
#ifdef CONFIG_FAILSLAB
extern bool should_failslab(size_t size, gfp_t gfpflags, unsigned long flags);
#else
static inline bool should_failslab(size_t size, gfp_t gfpflags,
unsigned long flags)
{
return false;
}
#endif /* CONFIG_FAILSLAB */
#endif /* _LINUX_FAULT_INJECT_H */