Commit 728c9fa3 authored by ZhaoLong Wang's avatar ZhaoLong Wang
Browse files

mtd: Add several functions to the fail_function list 

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8QZWQ


CVE: NA

-----------------------------------------

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: default avatarZhaoLong Wang <wangzhaolong1@huawei.com>
Reviewed-by: default avatarZhihao Cheng <chengzhihao1@huawei.com>
parent 5d3ebc0f

drivers/mtd/mtdcore.c

+5 −0
Original line number Diff line number Diff line
@@ -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>
@@ -1411,6 +1412,7 @@ 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.
@@ -1508,6 +1510,7 @@ 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)
@@ -1524,6 +1527,7 @@ 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
@@ -2344,6 +2348,7 @@ 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