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Btrfs: dont do log_removal in insert_new_root

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As for splitting a leaf, root is just the leaf, and tree mod log does not apply
on leaf, so in this case, we don't do log_removal.

As for splitting a node, the old root is kept as a normal node and we have nicely
put records in tree mod log for moving keys and items, so in this case we don't do
that either.

As above, insert_new_root can get rid of log_removal.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
This commit is contained in:
Liu Bo 2013-05-22 12:06:51 +00:00 committed by Josef Bacik
parent 4b286cd1f5
commit fdd99c7294
1 changed files with 5 additions and 5 deletions
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10
fs/btrfs/ctree.c
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@ -3143,7 +3143,7 @@ static int balance_node_right(struct btrfs_trans_handle *trans,
*/
static noinline int insert_new_root(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path, int level, int log_removal)
struct btrfs_path *path, int level)
{
u64 lower_gen;
struct extent_buffer *lower;
@ -3194,7 +3194,7 @@ static noinline int insert_new_root(struct btrfs_trans_handle *trans,
btrfs_mark_buffer_dirty(c);
old = root->node;
tree_mod_log_set_root_pointer(root, c, log_removal);
tree_mod_log_set_root_pointer(root, c, 0);
rcu_assign_pointer(root->node, c);
/* the super has an extra ref to root->node */
@ -3278,14 +3278,14 @@ static noinline int split_node(struct btrfs_trans_handle *trans,
/*
* trying to split the root, lets make a new one
*
* tree mod log: We pass 0 as log_removal parameter to
* tree mod log: We don't log_removal old root in
* insert_new_root, because that root buffer will be kept as a
* normal node. We are going to log removal of half of the
* elements below with tree_mod_log_eb_copy. We're holding a
* tree lock on the buffer, which is why we cannot race with
* other tree_mod_log users.
*/
ret = insert_new_root(trans, root, path, level + 1, 0);
ret = insert_new_root(trans, root, path, level + 1);
if (ret)
return ret;
} else {
@ -4005,7 +4005,7 @@ static noinline int split_leaf(struct btrfs_trans_handle *trans,
}
if (!path->nodes[1]) {
ret = insert_new_root(trans, root, path, 1, 1);
ret = insert_new_root(trans, root, path, 1);
if (ret)
return ret;
}