1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
|
'\" t
.\" Title: nvme-id-ns
.\" Author: [FIXME: author] [see http://www.docbook.org/tdg5/en/html/author]
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\" Date: 11/02/2022
.\" Manual: NVMe Manual
.\" Source: NVMe
.\" Language: English
.\"
.TH "NVME\-ID\-NS" "1" "11/02/2022" "NVMe" "NVMe Manual"
.\" -----------------------------------------------------------------
.\" * Define some portability stuff
.\" -----------------------------------------------------------------
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.\" http://bugs.debian.org/507673
.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.ie \n(.g .ds Aq \(aq
.el .ds Aq '
.\" -----------------------------------------------------------------
.\" * set default formatting
.\" -----------------------------------------------------------------
.\" disable hyphenation
.nh
.\" disable justification (adjust text to left margin only)
.ad l
.\" -----------------------------------------------------------------
.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.SH "NAME"
nvme-id-ns \- Send NVMe Identify Namespace, return result and structure
.SH "SYNOPSIS"
.sp
.nf
\fInvme id\-ns\fR <device> [\-v | \-\-vendor\-specific] [\-b | \-\-raw\-binary]
[\-\-namespace\-id=<nsid> | \-n <nsid>] [\-\-force]
[\-\-human\-readable | \-H]
[\-\-output\-format=<fmt> | \-o <fmt>]
.fi
.SH "DESCRIPTION"
.sp
For the NVMe device given, sends an identify namespace command and provides the result and returned structure\&.
.sp
The <device> parameter is mandatory and may be either the NVMe character device (ex: /dev/nvme0), or a namespace block device (ex: /dev/nvme0n1)\&. If the character device is given, the \*(Aq\-\-namespace\-id\*(Aq option is mandatory, otherwise it will use the ns\-id of the namespace for the block device you opened\&. For block devices, the ns\-id used can be overridden with the same option\&.
.sp
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\&.
.SH "OPTIONS"
.PP
\-n <nsid>, \-\-namespace\-id=<nsid>
.RS 4
Retrieve the identify namespace structure for the given nsid\&. This is required for the character devices, or overrides the block nsid if given\&. If the controller supports namespace management capability and 0xFFFFFFFF is given, then the controller returns the identify namespace structure that specifies common capabilities across namespaces for the controller\&.
.RE
.PP
\-\-force
.RS 4
Request controller return the identify namespace structure even if the namespace is not attached to the controller\&. This is valid only for controllers at or newer than revision 1\&.2\&. Controllers at revision lower than this may interpret the command incorrectly\&.
.RE
.PP
\-b, \-\-raw\-binary
.RS 4
Print the raw buffer to stdout\&. Structure is not parsed by program\&. This overrides the vendor specific and human readable options\&.
.RE
.PP
\-v, \-\-vendor\-specific
.RS 4
In addition to parsing known fields, this option will dump the vendor specific region of the structure in hex with ascii interpretation\&.
.RE
.PP
\-H, \-\-human\-readable
.RS 4
This option will parse and format many of the bit fields into human\-readable formats\&.
.RE
.PP
\-o <format>, \-\-output\-format=<format>
.RS 4
Set the reporting format to
\fInormal\fR,
\fIjson\fR, or
\fIbinary\fR\&. Only one output format can be used at a time\&.
.RE
.SH "EXAMPLES"
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
Has the program interpret the returned buffer and display the known fields in a human readable format:
.sp
.if n \{\
.RS 4
.\}
.nf
# nvme id\-ns /dev/nvme0n1
.fi
.if n \{\
.RE
.\}
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
If using the character device or overriding namespace id:
.sp
.if n \{\
.RS 4
.\}
.nf
# nvme id\-ns /dev/nvme0 \-n 1
# nvme id\-ns /dev/nvme0n1 \-n 1
# nvme id\-ns /dev/nvme0 \-\-namespace\-id=1
.fi
.if n \{\
.RE
.\}
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
In addition to showing the known fields, have the program to display the vendor unique field:
.sp
.if n \{\
.RS 4
.\}
.nf
# nvme id\-ns /dev/nvme0n1 \-\-vendor\-specific
# nvme id\-ns /dev/nvme0n1 \-v
.fi
.if n \{\
.RE
.\}
.sp
The above will dump the \*(Aqvs\*(Aq buffer in hex since it doesn\(cqt know how to interpret it\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
Have the program return the raw structure in binary:
.sp
.if n \{\
.RS 4
.\}
.nf
# nvme id\-ns /dev/nvme0n1 \-\-raw\-binary > id_ns\&.raw
# nvme id\-ns /dev/nvme0n1 \-b > id_ns\&.raw
.fi
.if n \{\
.RE
.\}
.sp
It is probably a bad idea to not redirect stdout when using this mode\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
Alternatively you may want to send the data to another program that can parse the raw buffer\&.
.sp
.if n \{\
.RS 4
.\}
.nf
# nvme id\-ns /dev/nvme0n1 \-\-raw\-binary | nvme_parse_id_ns
.fi
.if n \{\
.RE
.\}
.sp
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,
\*(Aq|\*(Aq, as shown in the above example, or you can
\*(Aqcat\*(Aq
a saved output buffer to it\&.
.RE
.sp
.if n \{\
.RS 4
.\}
.nf
/* File: nvme_parse_id_ns\&.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\en", ns\->nsze);
printf("ncap : %#llx\en", ns\->ncap);
return 0;
}
.fi
.if n \{\
.RE
.\}
.SH "NVME"
.sp
Part of the nvme\-user suite
|
