4c13dd3b48
This patch allow to inject faults only for specific slabs. In order to preserve default behavior cache filter is off by default (all caches are faulty). One may define specific set of slabs like this: # mark skbuff_head_cache as faulty echo 1 > /sys/kernel/slab/skbuff_head_cache/failslab # Turn on cache filter (off by default) echo 1 > /sys/kernel/debug/failslab/cache-filter # Turn on fault injection echo 1 > /sys/kernel/debug/failslab/times echo 1 > /sys/kernel/debug/failslab/probability Acked-by: David Rientjes <rientjes@google.com> Acked-by: Akinobu Mita <akinobu.mita@gmail.com> Acked-by: Christoph Lameter <cl@linux-foundation.org> Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
95 lines
2.2 KiB
C
95 lines
2.2 KiB
C
#ifndef _LINUX_FAULT_INJECT_H
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#define _LINUX_FAULT_INJECT_H
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#ifdef CONFIG_FAULT_INJECTION
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#include <linux/types.h>
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#include <linux/debugfs.h>
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#include <asm/atomic.h>
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/*
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* For explanation of the elements of this struct, see
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* Documentation/fault-injection/fault-injection.txt
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*/
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struct fault_attr {
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unsigned long probability;
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unsigned long interval;
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atomic_t times;
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atomic_t space;
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unsigned long verbose;
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u32 task_filter;
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unsigned long stacktrace_depth;
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unsigned long require_start;
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unsigned long require_end;
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unsigned long reject_start;
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unsigned long reject_end;
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unsigned long count;
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#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
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struct {
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struct dentry *dir;
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struct dentry *probability_file;
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struct dentry *interval_file;
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struct dentry *times_file;
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struct dentry *space_file;
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struct dentry *verbose_file;
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struct dentry *task_filter_file;
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struct dentry *stacktrace_depth_file;
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struct dentry *require_start_file;
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struct dentry *require_end_file;
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struct dentry *reject_start_file;
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struct dentry *reject_end_file;
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} dentries;
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#endif
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};
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#define FAULT_ATTR_INITIALIZER { \
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.interval = 1, \
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.times = ATOMIC_INIT(1), \
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.require_end = ULONG_MAX, \
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.stacktrace_depth = 32, \
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.verbose = 2, \
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}
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#define DECLARE_FAULT_ATTR(name) struct fault_attr name = FAULT_ATTR_INITIALIZER
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int setup_fault_attr(struct fault_attr *attr, char *str);
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void should_fail_srandom(unsigned long entropy);
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bool should_fail(struct fault_attr *attr, ssize_t size);
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#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
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int init_fault_attr_dentries(struct fault_attr *attr, const char *name);
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void cleanup_fault_attr_dentries(struct fault_attr *attr);
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#else /* CONFIG_FAULT_INJECTION_DEBUG_FS */
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static inline int init_fault_attr_dentries(struct fault_attr *attr,
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const char *name)
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{
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return -ENODEV;
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}
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static inline void cleanup_fault_attr_dentries(struct fault_attr *attr)
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{
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}
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#endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */
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#endif /* CONFIG_FAULT_INJECTION */
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#ifdef CONFIG_FAILSLAB
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extern bool should_failslab(size_t size, gfp_t gfpflags, unsigned long flags);
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#else
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static inline bool should_failslab(size_t size, gfp_t gfpflags,
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unsigned long flags)
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{
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return false;
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}
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#endif /* CONFIG_FAILSLAB */
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#endif /* _LINUX_FAULT_INJECT_H */
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