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flexnbd: add a mirror-speed command to change mirror->max_bytes_per_second

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It's not actually honoured yet, and ideally, you'd also be able to set it as
part of the initial setup: "flexnbd mirror ... -m 4G". remote_argv for the
mirror case would need to become x=y z=w format first, though.
This commit is contained in:
nick
2013-08-14 13:33:02 +01:00
parent 385c9027db
commit 28fff91af1
4 changed files with 132 additions and 13 deletions
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41
src/control.c
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@@ -310,7 +310,6 @@ enum mirror_state control_client_mirror_wait(
return mirror_state;
}
#define write_socket(msg) write(client->socket, (msg "\n"), strlen((msg))+1)
/** Command parser to start mirror process from socket input */
int control_mirror(struct control_client* client, int linesc, char** lines)
@@ -437,8 +436,41 @@ int control_mirror(struct control_client* client, int linesc, char** lines)
return 0;
}
#undef write_socket
int control_mirror_max_bps( struct control_client* client, int linesc, char** lines )
{
NULLCHECK( client );
NULLCHECK( client->flexnbd );
struct server* serve = flexnbd_server( client->flexnbd );
uint64_t max_Bps;
if ( !serve->mirror_super ) {
write_socket( "1: Not currently mirroring" );
return -1;
}
if ( linesc != 1 ) {
write_socket( "1: Bad format" );
return -1;
}
errno = 0;
max_Bps = strtoull( lines[0], NULL, 10 );
if ( errno == ERANGE ) {
write_socket( "1: max_bps out of range" );
return -1;
} else if ( errno != 0 ) {
write_socket( "1: max_bps couldn't be parsed" );
return -1;
}
serve->mirror->max_bytes_per_second = max_Bps;
write_socket( "0: updated" );
return 0;
}
#undef write_socket
/** Command parser to alter access control list from socket input */
int control_acl(struct control_client* client, int linesc, char** lines)
@@ -581,6 +613,11 @@ void control_respond(struct control_client * client)
if (control_status(client, linesc-1, lines+1) < 0) {
debug("status command failed");
}
} else if ( strcmp( lines[0], "mirror_max_bps" ) == 0 ) {
info( "mirror_max_bps command received" );
if( control_mirror_max_bps( client, linesc-1, lines+1 ) < 0 ) {
debug( "mirror_max_bps command failed" );
}
}
else {
write(client->socket, "10: unknown command\n", 23);