102 lines
2.8 KiB
Text
102 lines
2.8 KiB
Text
nvme-id-ns-lba-format(1)
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========================
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NAME
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----
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nvme-id-ns-lba-format - Send NVMe Identify Namespace for the specified LBA Format index, display structure
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SYNOPSIS
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--------
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[verse]
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'nvme id-ns' <device> [--uuid-index=<uuid-index> | -U <uuid_index>]
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[--lba-format-index=<lba_format_index> | -i <lba_format_index>]
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[-v | --verbose]
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[--output-format=<fmt> | -o <fmt>]
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DESCRIPTION
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-----------
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For the NVMe device given, sends an identify namespace for
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the specified LBA Format index command and provides the result
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that is include capability field only and returned structure.
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The <device> parameter is mandatory and may be either the NVMe character
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device (ex: /dev/nvme0), or a namespace block device (ex: /dev/nvme0n1).
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On success, the structure may be returned in one of several ways depending
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on the option flags; the structure may be parsed by the program or the
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raw buffer may be printed to stdout.
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OPTIONS
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-------
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-U <uuid-index>::
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--uuid-index=<uuid-index>::
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UUID Index of the feature
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-i <lba_format_index>::
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--lba-format-index=<lba_format_index>::
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This field specifies the index into the LBA Format list identifying
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the LBA Format capabilities that are to be returned
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-v::
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--verbose::
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Increase the information detail in the output.
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-o <format>::
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--output-format=<format>::
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Set the reporting format to 'normal', 'json', or
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'binary'. Only one output format can be used at a time.
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EXAMPLES
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--------
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* Has the program interpret the returned buffer and display the known
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fields in a human readable format:
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+
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------------
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# nvme id-ns-lba-format /dev/nvme0n1 -i 0
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------------
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+
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* Have the program return the raw structure in binary:
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------------
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# nvme id-ns-lba-format /dev/nvme0n1 -i 0 -o binary > id_ns.raw
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# nvme id-ns-lba-format /dev/nvme0n1 -i 0 --output-format=binary > id_ns.raw
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------------
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+
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It is probably a bad idea to not redirect stdout when using this mode.
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* Alternatively you may want to send the data to another program that
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can parse the raw buffer.
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+
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------------
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# nvme id-ns-lba-format /dev/nvme0n1 -i 0 --raw-binary | nvme_parse_id_ns
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------------
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+
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The parse program in the above example can be a program that shows the
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structure in a way you like. The following program is such an example
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that will parse it and can accept the output through a pipe, `'|'`,
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as shown in the above example, or you can `'cat'` a saved output buffer
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to it.
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------------
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/* File: nvme_parse_id_ns_lba_format.c */
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#include <linux/nvme.h>
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#include <stdio.h>
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#include <unistd.h>
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int main(int argc, char **argv)
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{
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unsigned char buf[sizeof(struct nvme_id_ns)];
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struct nvme_id_ns *ns = (struct nvme_id_ns *)buf;
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if (read(STDIN_FILENO, buf, sizeof(buf)))
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return 1;
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printf("nsze : %#llx\n", ns->nlbaf);
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printf("ncap : %#llx\n", ns->mc);
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return 0;
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}
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------------
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NVME
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----
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Part of the nvme-user suite
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