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mtd: Add several functions to the fail_function list

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add mtd_read(), mtd_write(), mtd_erase(), mtd_block_markbad() to
fail_function list for testing purpose

- Specify the function to inject the fault
echo mtd_read > /sys/kernel/debug/fail_function/inject

- Specifies the return value of the function to inject the fault
printf %#x -12 > /sys/kernel/debug/fail_function/mtd_read/retval

- Specify other fault injection configuration parameters.
echo -1 > /sys/kernel/debug/fail_function/times
echo 100 > /sys/kernel/debug/fail_function/probability
echo 15 > /sys/kernel/debug/fail_function/space

Signed-off-by: ZhaoLong Wang <wangzhaolong1@huawei.com>
Reviewed-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
ZhaoLong Wang 2023-12-26 09:01:13 +08:00 committed by Richard Weinberger
parent 4d0deb380a
commit 2fe48aaab2
1 changed files with 5 additions and 0 deletions
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5
drivers/mtd/mtdcore.c
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@ -30,6 +30,7 @@
#include <linux/debugfs.h>
#include <linux/nvmem-provider.h>
#include <linux/root_dev.h>
#include <linux/error-injection.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
@ -1412,6 +1413,7 @@ int mtd_erase(struct mtd_info *mtd, struct erase_info *instr)
return ret;
}
EXPORT_SYMBOL_GPL(mtd_erase);
ALLOW_ERROR_INJECTION(mtd_erase, ERRNO);
/*
* This stuff for eXecute-In-Place. phys is optional and may be set to NULL.
@ -1511,6 +1513,7 @@ int mtd_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen,
return ret;
}
EXPORT_SYMBOL_GPL(mtd_read);
ALLOW_ERROR_INJECTION(mtd_read, ERRNO);
int mtd_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen,
const u_char *buf)
@ -1527,6 +1530,7 @@ int mtd_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen,
return ret;
}
EXPORT_SYMBOL_GPL(mtd_write);
ALLOW_ERROR_INJECTION(mtd_write, ERRNO);
/*
* In blackbox flight recorder like scenarios we want to make successful writes
@ -2347,6 +2351,7 @@ int mtd_block_markbad(struct mtd_info *mtd, loff_t ofs)
return 0;
}
EXPORT_SYMBOL_GPL(mtd_block_markbad);
ALLOW_ERROR_INJECTION(mtd_block_markbad, ERRNO);
/*
* default_mtd_writev - the default writev method