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

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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: Caleb Sander Mateos <csander@purestorage.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Caleb Sander Mateos 2026-01-08 02:19:41 -07:00 • committed by Jens Axboe
parent c1d7c0f9cd
commit 261b67f4e3
2 changed files with 39 additions and 2 deletions
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5
tools/testing/selftests/ublk/Makefile
View file

@ -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

36
tools/testing/selftests/ublk/metadata_size.c Normal file
View file

@ -0,0 +1,36 @@
// 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;
}