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Block a second mirror attempt

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If a second mirror command is run while the first is still going,
flexnbd needs to prevent the second because we only have one dirty map.
Also, the shutdown becomes Complicated if we allow more than one mirror
at a time.
This commit is contained in:
Alex Young
2012-07-16 11:21:56 +01:00
parent db30ea0c48
commit 66ff06fe0e
1 changed files with 27 additions and 21 deletions
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6
src/control.c
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@@ -361,6 +361,11 @@ int control_mirror(struct control_client* client, int linesc, char** lines)
flexnbd_lock_switch( flexnbd );
{
struct server * serve = flexnbd_server(flexnbd);
if ( serve->mirror_super ) {
warn( "Tried to start a second mirror run" );
write_socket( "1: mirror already running" );
} else {
serve->mirror_super = mirror_super_create(
serve->filename,
connect_to,
@@ -385,6 +390,7 @@ int control_mirror(struct control_client* client, int linesc, char** lines)
debug("Control thread writing response");
control_write_mirror_response( state, client->socket );
}
}
debug( "Control thread unlocking switch" );
flexnbd_unlock_switch( flexnbd );
debug( "Control thread going away." );