btrfs-progs: check: move pin_down_tree_blocks to mode-common.c

Move pin_down_tree_blocks from main.c to mode-common.c for
further patches.
And export pin_metadata_blocks to mode-common.h.

Signed-off-by: Su Yue <suy.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 88 insertions, 0 deletions

diff --git a/check/mode-common.c b/check/mode-common.c
index e857d44d..0b57412b 100644
--- a/check/mode-common.c
+++ b/check/mode-common.c
@@ -605,3 +605,91 @@ void reset_cached_block_groups(struct btrfs_fs_info *fs_info)
 		start = cache->key.objectid + cache->key.offset;
 	}
 }
+
+static int pin_down_tree_blocks(struct btrfs_fs_info *fs_info,
+				struct extent_buffer *eb, int tree_root)
+{
+	struct extent_buffer *tmp;
+	struct btrfs_root_item *ri;
+	struct btrfs_key key;
+	u64 bytenr;
+	int level = btrfs_header_level(eb);
+	int nritems;
+	int ret;
+	int i;
+
+	/*
+	 * If we have pinned this block before, don't pin it again.
+	 * This can not only avoid forever loop with broken filesystem
+	 * but also give us some speedups.
+	 */
+	if (test_range_bit(&fs_info->pinned_extents, eb->start,
+			   eb->start + eb->len - 1, EXTENT_DIRTY, 0))
+		return 0;
+
+	btrfs_pin_extent(fs_info, eb->start, eb->len);
+
+	nritems = btrfs_header_nritems(eb);
+	for (i = 0; i < nritems; i++) {
+		if (level == 0) {
+			btrfs_item_key_to_cpu(eb, &key, i);
+			if (key.type != BTRFS_ROOT_ITEM_KEY)
+				continue;
+			/* Skip the extent root and reloc roots */
+			if (key.objectid == BTRFS_EXTENT_TREE_OBJECTID ||
+			    key.objectid == BTRFS_TREE_RELOC_OBJECTID ||
+			    key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID)
+				continue;
+			ri = btrfs_item_ptr(eb, i, struct btrfs_root_item);
+			bytenr = btrfs_disk_root_bytenr(eb, ri);
+
+			/*
+			 * If at any point we start needing the real root we
+			 * will have to build a stump root for the root we are
+			 * in, but for now this doesn't actually use the root so
+			 * just pass in extent_root.
+			 */
+			tmp = read_tree_block(fs_info, bytenr, 0);
+			if (!extent_buffer_uptodate(tmp)) {
+				fprintf(stderr, "Error reading root block\n");
+				return -EIO;
+			}
+			ret = pin_down_tree_blocks(fs_info, tmp, 0);
+			free_extent_buffer(tmp);
+			if (ret)
+				return ret;
+		} else {
+			bytenr = btrfs_node_blockptr(eb, i);
+
+			/* If we aren't the tree root don't read the block */
+			if (level == 1 && !tree_root) {
+				btrfs_pin_extent(fs_info, bytenr,
+						fs_info->nodesize);
+				continue;
+			}
+
+			tmp = read_tree_block(fs_info, bytenr, 0);
+			if (!extent_buffer_uptodate(tmp)) {
+				fprintf(stderr, "Error reading tree block\n");
+				return -EIO;
+			}
+			ret = pin_down_tree_blocks(fs_info, tmp, tree_root);
+			free_extent_buffer(tmp);
+			if (ret)
+				return ret;
+		}
+	}
+
+	return 0;
+}
+
+int pin_metadata_blocks(struct btrfs_fs_info *fs_info)
+{
+	int ret;
+
+	ret = pin_down_tree_blocks(fs_info, fs_info->chunk_root->node, 0);
+	if (ret)
+		return ret;
+
+	return pin_down_tree_blocks(fs_info, fs_info->tree_root->node, 1);
+}