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261b67f4e3
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>
37 lines
698 B
C
37 lines
698 B
C
// SPDX-License-Identifier: GPL-2.0
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#include <fcntl.h>
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#include <linux/fs.h>
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#include <stdio.h>
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#include <sys/ioctl.h>
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int main(int argc, char **argv)
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{
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struct logical_block_metadata_cap cap = {};
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const char *filename;
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int fd;
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int result;
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if (argc != 2) {
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fprintf(stderr, "Usage: %s BLOCK_DEVICE\n", argv[0]);
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return 1;
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}
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filename = argv[1];
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fd = open(filename, O_RDONLY);
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if (fd < 0) {
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perror(filename);
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return 1;
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}
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result = ioctl(fd, FS_IOC_GETLBMD_CAP, &cap);
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if (result < 0) {
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perror("ioctl");
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return 1;
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}
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printf("metadata_size: %u\n", cap.lbmd_size);
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printf("pi_offset: %u\n", cap.lbmd_pi_offset);
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printf("pi_tuple_size: %u\n", cap.lbmd_pi_size);
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return 0;
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}
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