From 85d4198e40c289dd623cecd16601fa613559bed7 Mon Sep 17 00:00:00 2001 From: Yan Zheng Date: Thu, 11 Jun 2009 08:51:10 -0400 Subject: Btrfs: check duplicate backrefs for both data and metadata lookup_inline_extent_backref only checks for duplicate backref for data extents. It assumes backrefs for tree block never conflict. This patch makes lookup_inline_extent_backref check for duplicate backrefs for both data and tree block, so that we can detect potential bug earlier. This is a safety check, strictly speaking it is not required. Signed-off-by: Yan Zheng Signed-off-by: Chris Mason --- fs/btrfs/extent-tree.c | 15 ++++----------- 1 file changed, 4 insertions(+), 11 deletions(-) (limited to 'fs/btrfs') diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 33a65f2..edc7d20 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -1056,8 +1056,7 @@ int lookup_inline_extent_backref(struct btrfs_trans_handle *trans, want = extent_ref_type(parent, owner); if (insert) { extra_size = btrfs_extent_inline_ref_size(want); - if (owner >= BTRFS_FIRST_FREE_OBJECTID) - path->keep_locks = 1; + path->keep_locks = 1; } else extra_size = -1; ret = btrfs_search_slot(trans, root, &key, path, extra_size, 1); @@ -1087,12 +1086,6 @@ int lookup_inline_extent_backref(struct btrfs_trans_handle *trans, #endif BUG_ON(item_size < sizeof(*ei)); - if (owner < BTRFS_FIRST_FREE_OBJECTID && insert && - item_size + extra_size >= BTRFS_MAX_EXTENT_ITEM_SIZE(root)) { - err = -EAGAIN; - goto out; - } - ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); flags = btrfs_extent_flags(leaf, ei); @@ -1165,15 +1158,15 @@ int lookup_inline_extent_backref(struct btrfs_trans_handle *trans, * For simplicity, we just do not add new inline back * ref if there is any kind of item for this block */ - if (owner >= BTRFS_FIRST_FREE_OBJECTID && - find_next_key(path, &key) == 0 && key.objectid == bytenr) { + if (find_next_key(path, &key) == 0 && key.objectid == bytenr && + key.type < BTRFS_BLOCK_GROUP_ITEM_KEY) { err = -EAGAIN; goto out; } } *ref_ret = (struct btrfs_extent_inline_ref *)ptr; out: - if (insert && owner >= BTRFS_FIRST_FREE_OBJECTID) { + if (insert) { path->keep_locks = 0; btrfs_unlock_up_safe(path, 1); } -- cgit v1.1