Btrfs: Add support for multiple devices per filesystem
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index e9a0983..5e9f692 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -198,29 +198,42 @@
return werr;
}
+static int update_cowonly_root(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root)
+{
+ int ret;
+ u64 old_root_bytenr;
+ struct btrfs_root *tree_root = root->fs_info->tree_root;
+
+ btrfs_write_dirty_block_groups(trans, root);
+ while(1) {
+ old_root_bytenr = btrfs_root_bytenr(&root->root_item);
+ if (old_root_bytenr == root->node->start)
+ break;
+ btrfs_set_root_bytenr(&root->root_item,
+ root->node->start);
+ btrfs_set_root_level(&root->root_item,
+ btrfs_header_level(root->node));
+ ret = btrfs_update_root(trans, tree_root,
+ &root->root_key,
+ &root->root_item);
+ BUG_ON(ret);
+ btrfs_write_dirty_block_groups(trans, root);
+ }
+ return 0;
+}
+
int btrfs_commit_tree_roots(struct btrfs_trans_handle *trans,
struct btrfs_root *root)
{
- int ret;
- u64 old_extent_block;
struct btrfs_fs_info *fs_info = root->fs_info;
- struct btrfs_root *tree_root = fs_info->tree_root;
- struct btrfs_root *extent_root = fs_info->extent_root;
+ struct list_head *next;
- btrfs_write_dirty_block_groups(trans, extent_root);
- while(1) {
- old_extent_block = btrfs_root_bytenr(&extent_root->root_item);
- if (old_extent_block == extent_root->node->start)
- break;
- btrfs_set_root_bytenr(&extent_root->root_item,
- extent_root->node->start);
- btrfs_set_root_level(&extent_root->root_item,
- btrfs_header_level(extent_root->node));
- ret = btrfs_update_root(trans, tree_root,
- &extent_root->root_key,
- &extent_root->root_item);
- BUG_ON(ret);
- btrfs_write_dirty_block_groups(trans, extent_root);
+ while(!list_empty(&fs_info->dirty_cowonly_roots)) {
+ next = fs_info->dirty_cowonly_roots.next;
+ list_del_init(next);
+ root = list_entry(next, struct btrfs_root, dirty_list);
+ update_cowonly_root(trans, root);
}
return 0;
}
@@ -616,6 +629,7 @@
unsigned long timeout = 1;
struct btrfs_transaction *cur_trans;
struct btrfs_transaction *prev_trans = NULL;
+ struct btrfs_root *chunk_root = root->fs_info->chunk_root;
struct list_head dirty_fs_roots;
struct extent_io_tree *pinned_copy;
DEFINE_WAIT(wait);
@@ -714,6 +728,10 @@
btrfs_set_super_root_level(&root->fs_info->super_copy,
btrfs_header_level(root->fs_info->tree_root->node));
+ btrfs_set_super_chunk_root(&root->fs_info->super_copy,
+ chunk_root->node->start);
+ btrfs_set_super_chunk_root_level(&root->fs_info->super_copy,
+ btrfs_header_level(chunk_root->node));
write_extent_buffer(root->fs_info->sb_buffer,
&root->fs_info->super_copy, 0,
sizeof(root->fs_info->super_copy));