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Btrfs: Metadata ENOSPC handling for balance

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This patch adds metadata ENOSPC handling for the balance code.
It is consisted by following major changes:

1. Avoid COW tree leave in the phrase of merging tree.

2. Handle interaction with snapshot creation.

3. make the backref cache can live across transactions.

Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Yan, Zheng
2010-05-16 10:49:59 -04:00
committed by Chris Mason
parent efa5646456
commit 3fd0a5585e
5 changed files with 1166 additions and 750 deletions
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3
fs/btrfs/ctree.c
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@@ -447,6 +447,9 @@ static noinline int __btrfs_cow_block(struct btrfs_trans_handle *trans,
update_ref_for_cow(trans, root, buf, cow, &last_ref);
if (root->ref_cows)
btrfs_reloc_cow_block(trans, root, buf, cow);
if (buf == root->node) {
WARN_ON(parent && parent != buf);
if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID ||