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Tue, 16 Dec 2025 21:35:13 -0800 (PST) Received: from c7-smtp-2023.dev.purestorage.com ([208.88.159.129]) by smtp-relay.gmail.com with ESMTPS id 46e09a7af769-7cadb33121dsm2862394a34.8.2025.12.16.21.35.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 16 Dec 2025 21:35:13 -0800 (PST) X-Relaying-Domain: purestorage.com Received: from dev-csander.dev.purestorage.com (unknown [IPv6:2620:125:9007:640:ffff::1199]) by c7-smtp-2023.dev.purestorage.com (Postfix) with ESMTP id 089EA342237; Tue, 16 Dec 2025 22:35:13 -0700 (MST) Received: by dev-csander.dev.purestorage.com (Postfix, from userid 1557716354) id 06676E41A08; Tue, 16 Dec 2025 22:35:13 -0700 (MST) From: Caleb Sander Mateos To: Ming Lei , Jens Axboe , Shuah Khan Cc: linux-block@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Stanley Zhang , Uday Shankar , Caleb Sander Mateos Subject: [PATCH 14/20] selftests: ublk: add utility to get block device metadata size Date: Tue, 16 Dec 2025 22:34:48 -0700 Message-ID: <20251217053455.281509-15-csander@purestorage.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20251217053455.281509-1-csander@purestorage.com> References: <20251217053455.281509-1-csander@purestorage.com> Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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 --- 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 +#include +#include +#include + +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