[RFC PATCH 03/19] btrfs: load key tree

[Mark Harmstone]

Signed-off-by: Mark Harmstone <mark@xxxxxxxxxxxxx>
---
 fs/btrfs/ctree.h   |  2 ++
 fs/btrfs/disk-io.c | 11 +++++++++++
 2 files changed, 13 insertions(+)

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 68f322f600a0..bd2e59dd0eba 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -758,6 +758,7 @@ struct btrfs_fs_info {
 	struct btrfs_root *quota_root;
 	struct btrfs_root *uuid_root;
 	struct btrfs_root *free_space_root;
+	struct btrfs_root *key_root;
 
 	/* the log root tree is a directory of all the other log roots */
 	struct btrfs_root *log_root_tree;
@@ -2957,6 +2958,7 @@ static inline void free_fs_info(struct btrfs_fs_info *fs_info)
 	kfree(fs_info->quota_root);
 	kfree(fs_info->uuid_root);
 	kfree(fs_info->free_space_root);
+	kfree(fs_info->key_root);
 	kfree(fs_info->super_copy);
 	kfree(fs_info->super_for_commit);
 	security_free_mnt_opts(&fs_info->security_opts);
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 6d776717d8b3..a533c00855be 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1559,6 +1559,9 @@ struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
 	if (location->objectid == BTRFS_FREE_SPACE_TREE_OBJECTID)
 		return fs_info->free_space_root ? fs_info->free_space_root :
 						  ERR_PTR(-ENOENT);
+	if (location->objectid == BTRFS_KEY_TREE_OBJECTID)
+		return fs_info->key_root ? fs_info->key_root :
+					     ERR_PTR(-ENOENT);
 again:
 	root = btrfs_lookup_fs_root(fs_info, location->objectid);
 	if (root) {
@@ -2029,6 +2032,7 @@ static void free_root_pointers(struct btrfs_fs_info *info, int chunk_root)
 	if (chunk_root)
 		free_root_extent_buffers(info->chunk_root);
 	free_root_extent_buffers(info->free_space_root);
+	free_root_extent_buffers(info->key_root);
 }
 
 void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info)
@@ -2349,6 +2353,13 @@ static int btrfs_read_roots(struct btrfs_fs_info *fs_info)
 		fs_info->free_space_root = root;
 	}
 
+	location.objectid = BTRFS_KEY_TREE_OBJECTID;
+	root = btrfs_read_tree_root(tree_root, &location);
+	if (!IS_ERR(root)) {
+		set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
+		fs_info->key_root = root;
+	}
+
 	return 0;
 out:
 	btrfs_warn(fs_info, "failed to read root (objectid=%llu): %d",
-- 
2.19.2