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>

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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

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36

tools/testing/selftests/ublk/metadata_size.c

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