Commit c4fbb430 authored by Josef Bacik's avatar Josef Bacik Committed by Chris Mason

Btrfs: fix worst case calculator for space usage

Forever ago I made the worst case calculator say that we could potentially split
into 3 blocks for every level on the way down, which isn't right.  If we split
we're only going to get two new blocks, the one we originally cow'ed and the new
one we're going to split.  Thanks,
Signed-off-by: default avatarJosef Bacik <jbacik@fusionio.com>
Signed-off-by: default avatarChris Mason <chris.mason@fusionio.com>
parent 14575aef
...@@ -3135,7 +3135,7 @@ static inline u64 btrfs_calc_trans_metadata_size(struct btrfs_root *root, ...@@ -3135,7 +3135,7 @@ static inline u64 btrfs_calc_trans_metadata_size(struct btrfs_root *root,
unsigned num_items) unsigned num_items)
{ {
return (root->leafsize + root->nodesize * (BTRFS_MAX_LEVEL - 1)) * return (root->leafsize + root->nodesize * (BTRFS_MAX_LEVEL - 1)) *
3 * num_items; 2 * num_items;
} }
/* /*
......
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