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