[FTP] keep list of busy connections

A busy connection is a connection that is currently used as a handle for
a file transfer (upload or download). If all connections are busy, we
can just return EBUSY instead of waiting for 30 seconds for a connection
to become available.

This is mostly useful for performance when there is a maximum of 1
connection to the server and this connection is busy transferring a
file. Even gio functions like g_file_copy() sometimes do additional
operations while transferring files. (It does a query_info for the
progress callback.)

1 files changed, 1 insertions, 0 deletions

diff --git a/daemon/gvfsbackendftp.h b/daemon/gvfsbackendftp.h
index ae58f7b4..54ebb696 100644
--- a/daemon/gvfsbackendftp.h
+++ b/daemon/gvfsbackendftp.h
@@ -96,6 +96,7 @@ struct _GVfsBackendFtp
   GCond *        	cond;                   /* cond used to signal tasks waiting on the mutex */
   GQueue *        	queue;                  /* queue containing the connections */
   guint        		connections;            /* current number of connections */
+  guint                 busy_connections;       /* current number of connections being used for reads/writes */
   guint        		max_connections;        /* upper server limit for number of connections - dynamically generated */
 };