diff options
| author | Caleb Sander Mateos <csander@purestorage.com> | 2026-01-08 02:19:41 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2026-01-12 09:16:38 -0700 |
| commit | 261b67f4e34716e793b0b95d2722b2fe780ed5f4 (patch) | |
| tree | 4bbbfd68a1b92f54ddc65b01719dddb9131e7a67 /tools/testing/selftests | |
| parent | c1d7c0f9cdf6690eff4518f1c17a37d5ee647cd1 (diff) | |
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: Caleb Sander Mateos <csander@purestorage.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'tools/testing/selftests')
| -rw-r--r-- | tools/testing/selftests/ublk/Makefile | 5 | ||||
| -rw-r--r-- | tools/testing/selftests/ublk/metadata_size.c | 36 |
2 files changed, 39 insertions, 2 deletions
diff --git a/tools/testing/selftests/ublk/Makefile b/tools/testing/selftests/ublk/Makefile index 06ba6fde098d..351ac6438561 100644 --- a/tools/testing/selftests/ublk/Makefile +++ b/tools/testing/selftests/ublk/Makefile @@ -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 diff --git a/tools/testing/selftests/ublk/metadata_size.c b/tools/testing/selftests/ublk/metadata_size.c new file mode 100644 index 000000000000..76ecddf04d25 --- /dev/null +++ b/tools/testing/selftests/ublk/metadata_size.c @@ -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; +} |