663faf9f7b
Add injectable error types for each error-injectable function. One motivation of error injection test is to find software flaws, mistakes or mis-handlings of expectable errors. If we find such flaws by the test, that is a program bug, so we need to fix it. But if the tester miss input the error (e.g. just return success code without processing anything), it causes unexpected behavior even if the caller is correctly programmed to handle any errors. That is not what we want to test by error injection. To clarify what type of errors the caller must expect for each injectable function, this introduces injectable error types: - EI_ETYPE_NULL : means the function will return NULL if it fails. No ERR_PTR, just a NULL. - EI_ETYPE_ERRNO : means the function will return -ERRNO if it fails. - EI_ETYPE_ERRNO_NULL : means the function will return -ERRNO (ERR_PTR) or NULL. ALLOW_ERROR_INJECTION() macro is expanded to get one of NULL, ERRNO, ERRNO_NULL to record the error type for each function. e.g. ALLOW_ERROR_INJECTION(open_ctree, ERRNO) This error types are shown in debugfs as below. ==== / # cat /sys/kernel/debug/error_injection/list open_ctree [btrfs] ERRNO io_ctl_init [btrfs] ERRNO ==== Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Reviewed-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
27 lines
612 B
C
27 lines
612 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_ERROR_INJECTION_H
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#define _LINUX_ERROR_INJECTION_H
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#ifdef CONFIG_FUNCTION_ERROR_INJECTION
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#include <asm/error-injection.h>
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extern bool within_error_injection_list(unsigned long addr);
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extern int get_injectable_error_type(unsigned long addr);
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#else /* !CONFIG_FUNCTION_ERROR_INJECTION */
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#include <asm-generic/error-injection.h>
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static inline bool within_error_injection_list(unsigned long addr)
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{
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return false;
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}
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static inline int get_injectable_error_type(unsigned long addr)
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{
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return EI_ETYPE_NONE;
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}
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#endif
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#endif /* _LINUX_ERROR_INJECTION_H */
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