scoutfs: use radix allocator

Convert metadata block and file data extent allocations to use the radix
allocator.

Most of this is simple transitions between types and calls.  The server
no longer has to initialize blocks because mkfs can write a single
radix parent block with fully set parent refs to initialize a full
radix.  We remove the code and fields that were responsible for adding
uninitialized data and metadata.

The rest of the unused block allocator code is only ifdefed out.  It'll
be removed in a separate patch to reduce noise here.

Signed-off-by: Zach Brown <zab@versity.com>

kmod/src/trans.c

@@ -25,7 +25,7 @@
 #include "counters.h"
 #include "client.h"
 #include "inode.h"
-#include "balloc.h"
+#include "radix.h"
 #include "block.h"
 #include "scoutfs_trace.h"
 
@@ -64,7 +64,7 @@ struct trans_info {
 	bool writing;
 
 	struct scoutfs_log_trees lt;
-	struct scoutfs_balloc_allocator alloc;
+	struct scoutfs_radix_allocator alloc;
 	struct scoutfs_block_writer wri;
 };
 
@@ -89,8 +89,8 @@ static int commit_btrees(struct super_block *sb)
 	struct scoutfs_log_trees lt;
 
 	lt = tri->lt;
-	lt.alloc_root = tri->alloc.alloc_root;
-	lt.free_root = tri->alloc.free_root;
+	lt.meta_avail = tri->alloc.avail;
+	lt.meta_freed = tri->alloc.freed;
 	scoutfs_forest_get_btrees(sb, &lt);
 	scoutfs_data_get_btrees(sb, &lt);
 
@@ -110,7 +110,8 @@ int scoutfs_trans_get_log_trees(struct super_block *sb)
 	ret = scoutfs_client_get_log_trees(sb, &lt);
 	if (ret == 0) {
 		tri->lt = lt;
-		scoutfs_balloc_init(&tri->alloc, &lt.alloc_root, &lt.free_root);
+		scoutfs_radix_init_alloc(&tri->alloc, &lt.meta_avail,
+					 &lt.meta_freed);
 		scoutfs_block_writer_init(sb, &tri->wri);
 
 		scoutfs_forest_init_btrees(sb, &tri->alloc, &tri->wri, &lt);