[SERVER] Remove non-working images from list, plus refactoring

Now that we can automatically load unknown images from disk on request,
it makes sense to remove non-working images from the image list. On
future requests, we will look for them on disk again, which is nice
in case of temporary storage hickups.

Also, some more ore less related locking has been refined (loading images,
replicating images)

1 files changed, 6 insertions, 0 deletions

diff --git a/src/server/globals.h b/src/server/globals.h
index 575f3ab..0bf34de 100644
--- a/src/server/globals.h
+++ b/src/server/globals.h
@@ -111,6 +111,7 @@ struct _dnbd3_image
 	int users;             // clients currently using this image
 	int id;                // Unique ID of this image. Only unique in the context of this running instance of DNBD3-Server
 	time_t atime;          // last access time
+	time_t lastWorkCheck;  // last time a non-working image has been checked
 	bool working; // true if image exists and completeness is == 100% or a working upstream proxy is connected
 	pthread_spinlock_t lock;
 };
@@ -170,6 +171,11 @@ extern bool _isProxy;
 extern bool _proxyPrivateOnly;
 
 /**
+ * Whether to remove missing images from image list on SIGHUP
+ */
+extern bool _removeMissingImages;
+
+/**
  * Read timeout when waiting for or sending data on an uplink
  */
 extern int _uplinkTimeout;