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Btrfs: Add BH_Defrag to mark buffers that are in need of defragging

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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>
This commit is contained in:
Chris Mason
2007-08-10 14:42:37 -04:00
committed by David Woodhouse
parent e9d0b13b5b
commit f2183bde1a
4 changed files with 18 additions and 11 deletions
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3
fs/btrfs/tree-defrag.c
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@@ -86,7 +86,7 @@ static int defrag_walk_down(struct btrfs_trans_handle *trans,
if (cache_only) {
next = btrfs_find_tree_block(root, blocknr);
if (!next || !buffer_uptodate(next) ||
buffer_locked(next)) {
buffer_locked(next) || !buffer_defrag(next)) {
brelse(next);
path->slots[*level]++;
continue;
@@ -142,6 +142,7 @@ static int defrag_walk_up(struct btrfs_trans_handle *trans,
root->defrag_level = i;
return 0;
} else {
clear_buffer_defrag(path->nodes[*level]);
btrfs_block_release(root, path->nodes[*level]);
path->nodes[*level] = NULL;
*level = i + 1;