Btrfs: Add BH_Defrag to mark buffers that are in need of defragging
This allows the tree walking code to defrag only the newly allocated buffers, it seems to be a good balance between perfect defragging and the performance hit of repeatedly reallocating blocks. Signed-off-by: Chris Mason <chris.mason@oracle.com>
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@ -175,6 +175,7 @@ int btrfs_realloc_node(struct btrfs_trans_handle *trans,
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int end_slot;
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int i;
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int err = 0;
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int parent_level;
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if (trans->transaction != root->fs_info->running_transaction) {
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printk(KERN_CRIT "trans %Lu running %Lu\n", trans->transid,
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@ -188,6 +189,7 @@ int btrfs_realloc_node(struct btrfs_trans_handle *trans,
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}
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parent_node = btrfs_buffer_node(parent);
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parent_nritems = btrfs_header_nritems(&parent_node->header);
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parent_level = btrfs_header_level(&parent_node->header);
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start_slot = 0;
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end_slot = parent_nritems;
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@ -215,13 +217,16 @@ int btrfs_realloc_node(struct btrfs_trans_handle *trans,
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cur_bh = btrfs_find_tree_block(root, blocknr);
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if (!cur_bh || !buffer_uptodate(cur_bh) ||
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buffer_locked(cur_bh)) {
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buffer_locked(cur_bh) || !buffer_defrag(cur_bh)) {
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if (cache_only) {
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brelse(cur_bh);
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continue;
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}
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brelse(cur_bh);
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cur_bh = read_tree_block(root, blocknr);
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if (!cur_bh || !buffer_uptodate(cur_bh) ||
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buffer_locked(cur_bh)) {
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brelse(cur_bh);
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cur_bh = read_tree_block(root, blocknr);
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}
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}
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if (search_start == 0)
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search_start = last_block & ~((u64)65535);
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@ -232,6 +237,9 @@ int btrfs_realloc_node(struct btrfs_trans_handle *trans,
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if (err)
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break;
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search_start = bh_blocknr(tmp_bh);
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*last_ret = search_start;
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if (parent_level == 1)
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clear_buffer_defrag(tmp_bh);
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brelse(tmp_bh);
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}
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return err;
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@ -811,16 +819,10 @@ static void reada_for_search(struct btrfs_root *root, struct btrfs_path *path,
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clear_radix_bit(&found, blocknr);
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if (nread > 32)
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continue;
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if (direction > 0 && cluster_start <= blocknr &&
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cluster_start + 8 > blocknr) {
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cluster_start = blocknr;
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if (close_blocks(cluster_start, blocknr)) {
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readahead_tree_block(root, blocknr);
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nread++;
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} else if (direction < 0 && cluster_start >= blocknr &&
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blocknr + 8 > cluster_start) {
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cluster_start = blocknr;
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readahead_tree_block(root, blocknr);
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nread++;
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}
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}
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}
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@ -25,8 +25,10 @@
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enum btrfs_bh_state_bits {
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BH_Checked = BH_PrivateStart,
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BH_Defrag,
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};
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BUFFER_FNS(Checked, checked);
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BUFFER_FNS(Defrag, defrag);
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static inline struct btrfs_node *btrfs_buffer_node(struct buffer_head *bh)
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{
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@ -1015,6 +1015,7 @@ check_failed:
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ins->objectid = search_start;
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ins->offset = 0;
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start_found = 0;
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path->reada = 1;
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ret = btrfs_search_slot(trans, root, ins, path, 0, 0);
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if (ret < 0)
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@ -1264,6 +1265,7 @@ struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
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WARN_ON(buffer_dirty(buf));
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set_buffer_uptodate(buf);
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set_buffer_checked(buf);
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set_buffer_defrag(buf);
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set_radix_bit(&trans->transaction->dirty_pages, buf->b_page->index);
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return buf;
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}
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@ -86,7 +86,7 @@ static int defrag_walk_down(struct btrfs_trans_handle *trans,
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if (cache_only) {
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next = btrfs_find_tree_block(root, blocknr);
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if (!next || !buffer_uptodate(next) ||
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buffer_locked(next)) {
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buffer_locked(next) || !buffer_defrag(next)) {
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brelse(next);
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path->slots[*level]++;
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continue;
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@ -142,6 +142,7 @@ static int defrag_walk_up(struct btrfs_trans_handle *trans,
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root->defrag_level = i;
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return 0;
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} else {
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clear_buffer_defrag(path->nodes[*level]);
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btrfs_block_release(root, path->nodes[*level]);
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path->nodes[*level] = NULL;
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*level = i + 1;
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