ocfs2: Enable cross extent block merge.
In ocfs2_figure_merge_contig_type, we judge whether there exists
a cross extent block merge and enable it by setting CONTIG_LEFT
and CONTIG_RIGHT accordingly.
Signed-off-by: Tao Ma <tao.ma@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
index f63cb32..7d81aa6 100644
--- a/fs/ocfs2/alloc.c
+++ b/fs/ocfs2/alloc.c
@@ -3782,20 +3782,57 @@
}
static enum ocfs2_contig_type
-ocfs2_figure_merge_contig_type(struct inode *inode,
+ocfs2_figure_merge_contig_type(struct inode *inode, struct ocfs2_path *path,
struct ocfs2_extent_list *el, int index,
struct ocfs2_extent_rec *split_rec)
{
- struct ocfs2_extent_rec *rec;
+ int status;
enum ocfs2_contig_type ret = CONTIG_NONE;
+ u32 left_cpos, right_cpos;
+ struct ocfs2_extent_rec *rec = NULL;
+ struct ocfs2_extent_list *new_el;
+ struct ocfs2_path *left_path = NULL, *right_path = NULL;
+ struct buffer_head *bh;
+ struct ocfs2_extent_block *eb;
+
+ if (index > 0) {
+ rec = &el->l_recs[index - 1];
+ } else if (path->p_tree_depth > 0) {
+ status = ocfs2_find_cpos_for_left_leaf(inode->i_sb,
+ path, &left_cpos);
+ if (status)
+ goto out;
+
+ if (left_cpos != 0) {
+ left_path = ocfs2_new_path(path_root_bh(path),
+ path_root_el(path));
+ if (!left_path)
+ goto out;
+
+ status = ocfs2_find_path(inode, left_path, left_cpos);
+ if (status)
+ goto out;
+
+ new_el = path_leaf_el(left_path);
+
+ if (le16_to_cpu(new_el->l_next_free_rec) !=
+ le16_to_cpu(new_el->l_count)) {
+ bh = path_leaf_bh(left_path);
+ eb = (struct ocfs2_extent_block *)bh->b_data;
+ OCFS2_RO_ON_INVALID_EXTENT_BLOCK(inode->i_sb,
+ eb);
+ goto out;
+ }
+ rec = &new_el->l_recs[
+ le16_to_cpu(new_el->l_next_free_rec) - 1];
+ }
+ }
/*
* We're careful to check for an empty extent record here -
* the merge code will know what to do if it sees one.
*/
-
- if (index > 0) {
- rec = &el->l_recs[index - 1];
+ if (rec) {
if (index == 1 && ocfs2_is_empty_extent(rec)) {
if (split_rec->e_cpos == el->l_recs[index].e_cpos)
ret = CONTIG_RIGHT;
@@ -3804,10 +3841,45 @@
}
}
- if (index < (le16_to_cpu(el->l_next_free_rec) - 1)) {
+ rec = NULL;
+ if (index < (le16_to_cpu(el->l_next_free_rec) - 1))
+ rec = &el->l_recs[index + 1];
+ else if (le16_to_cpu(el->l_next_free_rec) == le16_to_cpu(el->l_count) &&
+ path->p_tree_depth > 0) {
+ status = ocfs2_find_cpos_for_right_leaf(inode->i_sb,
+ path, &right_cpos);
+ if (status)
+ goto out;
+
+ if (right_cpos == 0)
+ goto out;
+
+ right_path = ocfs2_new_path(path_root_bh(path),
+ path_root_el(path));
+ if (!right_path)
+ goto out;
+
+ status = ocfs2_find_path(inode, right_path, right_cpos);
+ if (status)
+ goto out;
+
+ new_el = path_leaf_el(right_path);
+ rec = &new_el->l_recs[0];
+ if (ocfs2_is_empty_extent(rec)) {
+ if (le16_to_cpu(new_el->l_next_free_rec) <= 1) {
+ bh = path_leaf_bh(right_path);
+ eb = (struct ocfs2_extent_block *)bh->b_data;
+ OCFS2_RO_ON_INVALID_EXTENT_BLOCK(inode->i_sb,
+ eb);
+ goto out;
+ }
+ rec = &new_el->l_recs[1];
+ }
+ }
+
+ if (rec) {
enum ocfs2_contig_type contig_type;
- rec = &el->l_recs[index + 1];
contig_type = ocfs2_extent_contig(inode, rec, split_rec);
if (contig_type == CONTIG_LEFT && ret == CONTIG_RIGHT)
@@ -3816,6 +3888,12 @@
ret = contig_type;
}
+out:
+ if (left_path)
+ ocfs2_free_path(left_path);
+ if (right_path)
+ ocfs2_free_path(right_path);
+
return ret;
}
@@ -4278,7 +4356,7 @@
goto out;
}
- ctxt.c_contig_type = ocfs2_figure_merge_contig_type(inode, el,
+ ctxt.c_contig_type = ocfs2_figure_merge_contig_type(inode, path, el,
split_index,
split_rec);