---
name: "nbd_set_full_info"
section: "3"
platform: "linux"
package: "libnbd"
version: "1.24.4-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/nbd_set_full_info"
---

# nbd\_set\_full\_info(3)

control whether NBD\_OPT\_GO requests extra details

## NAME

nbd\_set\_full\_info - control whether NBD\_OPT\_GO requests extra details

## SYNOPSIS

```
 #include <libnbd.h>
 int nbd_set_full_info (
       struct nbd_handle *h, bool request
     );
```

## DESCRIPTION

By default, when connecting to an export, libnbd only requests the details it needs to service data operations.  The NBD protocol says that a server can supply optional information, such as a canonical name of the export (see [**nbd\_get\_canonical\_export\_name**(3)](/nbd_get_canonical_export_name/3.md)) or a description of the export (see [**nbd\_get\_export\_description**(3)](/nbd_get_export_description/3.md)), but that a hint from the client makes it more likely for this extra information to be provided.  This function controls whether libnbd will provide that hint.

Note that even when full info is requested, the server is not obligated to reply with all information that libnbd requested. Similarly, libnbd will ignore any optional server information that libnbd has not yet been taught to recognize.  Furthermore, the hint to request block sizes is independently controlled via [**nbd\_set\_request\_block\_size**(3)](/nbd_set_request_block_size/3.md).

## RETURN VALUE

If the call is successful the function returns `0`.

## ERRORS

On error `-1` is returned.

Refer to "ERROR HANDLING" in [**libnbd**(3)](/libnbd/3.md) for how to get further details of the error.

The following parameters must not be NULL: `"h"`. For more information see "Non-NULL parameters" in [**libnbd**(3)](/libnbd/3.md).

## HANDLE STATE

nbd\_set\_full\_info can be called when the handle is in the following states:

```
 ┌─────────────────────────────────────┬─────────────────────────┐
 │ Handle created, before connecting   │ ✅ allowed              │
 │ Connecting                          │ ❌ error                │
 │ Connecting & handshaking (opt_mode) │ ✅ allowed              │
 │ Connected to the server             │ ❌ error                │
 │ Connection shut down                │ ❌ error                │
 │ Handle dead                         │ ❌ error                │
 └─────────────────────────────────────┴─────────────────────────┘
```

## VERSION

This function first appeared in libnbd 1.4.

If you need to test if this function is available at compile time check if the following macro is defined:

```
 #define LIBNBD_HAVE_NBD_SET_FULL_INFO 1
```

## SEE ALSO

[**nbd\_create**(3)](/nbd_create/3.md), [**nbd\_get\_canonical\_export\_name**(3)](/nbd_get_canonical_export_name/3.md), [**nbd\_get\_export\_description**(3)](/nbd_get_export_description/3.md), [**nbd\_get\_full\_info**(3)](/nbd_get_full_info/3.md), [**nbd\_set\_request\_block\_size**(3)](/nbd_set_request_block_size/3.md), [**libnbd**(3)](/libnbd/3.md).

## AUTHORS

Eric Blake

Richard W.M. Jones

## COPYRIGHT

Copyright Red Hat

## LICENSE

This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA