nbd_flush - send flush command to the NBD server
#include <libnbd.h> int nbd_flush (struct nbd_handle *h, uint32_t flags);
Issue the flush command to the NBD server. The function should return when all write commands which have completed have been committed to permanent storage on the server. Note this will generally return an error if nbd_can_flush(3) is false.
flags parameter must be
0 for now (it exists for future NBD protocol extensions).
By default, libnbd will reject attempts to use this function with parameters that are likely to result in server failure, such as requesting an unknown command flag. The nbd_set_strict_mode(3) function can be used to alter which scenarios should await a server reply rather than failing fast.
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 connected with the server, otherwise this call will return an error.
This function first appeared in libnbd 1.0.
If you need to test if this function is available at compile time check if the following macro is defined:
#define LIBNBD_HAVE_NBD_FLUSH 1
nbd_aio_flush(3), nbd_can_flush(3), nbd_create(3), nbd_set_strict_mode(3), libnbd(3).
Richard W.M. Jones
Copyright (C) 2019-2021 Red Hat Inc.
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