Commit 261b67f4 authored by Caleb Sander Mateos's avatar Caleb Sander Mateos Committed by Jens Axboe
Browse files

selftests: ublk: add utility to get block device metadata size 



Some block device integrity parameters are available in sysfs, but
others are only accessible using the FS_IOC_GETLBMD_CAP ioctl. Add a
metadata_size utility program to print out the logical block metadata
size, PI offset, and PI size within the metadata. Example output:
$ metadata_size /dev/ublkb0
metadata_size: 64
pi_offset: 56
pi_tuple_size: 8

Signed-off-by: default avatarCaleb Sander Mateos <csander@purestorage.com>
Reviewed-by: default avatarMing Lei <ming.lei@redhat.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent c1d7c0f9

tools/testing/selftests/ublk/Makefile

+3 −2
Original line number Diff line number Diff line
@@ -49,12 +49,13 @@ TEST_PROGS += test_stress_05.sh 
TEST_PROGS += test_stress_06.sh

TEST_PROGS += test_stress_07.sh



TEST_GEN_PROGS_EXTENDED = kublk

TEST_GEN_PROGS_EXTENDED = kublk metadata_size

STANDALONE_UTILS := metadata_size.c



LOCAL_HDRS += $(wildcard *.h)

include ../lib.mk



$(TEST_GEN_PROGS_EXTENDED): $(wildcard *.c)

$(OUTPUT)/kublk: $(filter-out $(STANDALONE_UTILS),$(wildcard *.c))



check:

	shellcheck -x -f gcc *.sh

tools/testing/selftests/ublk/metadata_size.c

0 → 100644
+36 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

#include <fcntl.h>

#include <linux/fs.h>

#include <stdio.h>

#include <sys/ioctl.h>



int main(int argc, char **argv)

{

	struct logical_block_metadata_cap cap = {};

	const char *filename;

	int fd;

	int result;



	if (argc != 2) {

		fprintf(stderr, "Usage: %s BLOCK_DEVICE\n", argv[0]);

		return 1;

	}



	filename = argv[1];

	fd = open(filename, O_RDONLY);

	if (fd < 0) {

		perror(filename);

		return 1;

	}



	result = ioctl(fd, FS_IOC_GETLBMD_CAP, &cap);

	if (result < 0) {

		perror("ioctl");

		return 1;

	}



	printf("metadata_size: %u\n", cap.lbmd_size);

	printf("pi_offset: %u\n", cap.lbmd_pi_offset);

	printf("pi_tuple_size: %u\n", cap.lbmd_pi_size);

	return 0;

}