20060303a

1 files changed, 31 insertions, 0 deletions

diff --git a/liblogfs/findfreeblock.c b/liblogfs/findfreeblock.c
new file mode 100644
index 00000000..04d3be7e
--- /dev/null
+++ b/liblogfs/findfreeblock.c
@@ -0,0 +1,31 @@
+#include "lib9.h"
+#include "logfs.h"
+#include "local.h"
+
+long
+logfsfindfreeblock(LogfsLowLevel *ll, AllocReason reason)
+{
+	long b;
+	long total;
+	b = (*ll->findfreeblock)(ll, &total);
+	if(b < 0)
+		return b;
+	switch(reason) {
+	case AllocReasonReplace:
+		break;
+	case AllocReasonTransfer:
+		if(total <= Replacements)
+			return -1;
+		break;
+	case AllocReasonLogExtend:
+		if(total <= Replacements + Transfers)
+			return -1;
+		break;
+	case AllocReasonDataExtend:
+		if(total <= Replacements + Transfers + LogSlack)
+			return -1;
+		break;
+	}
+//print("allocated free block %ld\n", b);
+	return b;
+}