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authorChris Mason <chris.mason@oracle.com>2009-03-13 10:24:59 -0400
committerChris Mason <chris.mason@oracle.com>2009-03-24 16:14:25 -0400
commit9fa8cfe706f9c20067c042a064999d5825a35330 (patch)
tree8e64281caffcdb3ad5a8ab8bf22bb90483e9e214 /fs/btrfs/transaction.c
parent8e0ee43bc2c3e19db56a4adaa9a9b04ce885cd84 (diff)
Btrfs: don't preallocate metadata blocks during btrfs_search_slot
In order to avoid doing expensive extent management with tree locks held, btrfs_search_slot will preallocate tree blocks for use by COW without any tree locks held. A later commit moves all of the extent allocation work for COW into a delayed update mechanism, and this preallocation will no longer be required. Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/transaction.c')
-rw-r--r--fs/btrfs/transaction.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 4112d53d4f4d..d638c54d39e9 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -463,7 +463,7 @@ int btrfs_commit_tree_roots(struct btrfs_trans_handle *trans,
463 btrfs_extent_post_op(trans, fs_info->tree_root); 463 btrfs_extent_post_op(trans, fs_info->tree_root);
464 464
465 eb = btrfs_lock_root_node(fs_info->tree_root); 465 eb = btrfs_lock_root_node(fs_info->tree_root);
466 btrfs_cow_block(trans, fs_info->tree_root, eb, NULL, 0, &eb, 0); 466 btrfs_cow_block(trans, fs_info->tree_root, eb, NULL, 0, &eb);
467 btrfs_tree_unlock(eb); 467 btrfs_tree_unlock(eb);
468 free_extent_buffer(eb); 468 free_extent_buffer(eb);
469 469
@@ -766,7 +766,7 @@ static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans,
766 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); 766 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
767 767
768 old = btrfs_lock_root_node(root); 768 old = btrfs_lock_root_node(root);
769 btrfs_cow_block(trans, root, old, NULL, 0, &old, 0); 769 btrfs_cow_block(trans, root, old, NULL, 0, &old);
770 770
771 btrfs_copy_root(trans, root, old, &tmp, objectid); 771 btrfs_copy_root(trans, root, old, &tmp, objectid);
772 btrfs_tree_unlock(old); 772 btrfs_tree_unlock(old);