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 <[email protected]> --- tools/testing/selftests/ublk/Makefile | 4 +-- tools/testing/selftests/ublk/metadata_size.c | 36 ++++++++++++++++++++ 2 files changed, 38 insertions(+), 2 deletions(-) create mode 100644 tools/testing/selftests/ublk/metadata_size.c diff --git a/tools/testing/selftests/ublk/Makefile b/tools/testing/selftests/ublk/Makefile index 837977b62417..0f6abb95c87a 100644 --- a/tools/testing/selftests/ublk/Makefile +++ b/tools/testing/selftests/ublk/Makefile @@ -46,14 +46,14 @@ TEST_PROGS += test_stress_03.sh TEST_PROGS += test_stress_04.sh 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 include ../lib.mk -$(TEST_GEN_PROGS_EXTENDED): kublk.c null.c file_backed.c common.c stripe.c \ +$(OUTPUT)/kublk: kublk.c null.c file_backed.c common.c stripe.c \ fault_inject.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; +} -- 2.45.2
