nbd_set_full_info - control whether NBD_OPT_GO requests extra details
#include <libnbd.h> int nbd_set_full_info (struct nbd_handle *h, bool request);
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)) or a description of the export (see nbd_get_export_description(3)), 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).
If the call is successful the function returns
-1 is returned.
Refer to "ERROR HANDLING" in libnbd(3) for how to get further details of the error.
The handle must be newly created, or negotiating, otherwise this call will return an error.
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
nbd_create(3), nbd_get_canonical_export_name(3), nbd_get_export_description(3), nbd_get_full_info(3), nbd_set_request_block_size(3), libnbd(3).
Richard W.M. Jones
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