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btrfs: add a comp_refs() helper 

Instead of open-coding the delayed ref comparisons, add a helper to do
the comparisons generically and use that everywhere.  We compare
sequence numbers last for following patches.

Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2017-10-19 14:15:59 -04:00 committed by David Sterba
parent c7ad7c8439
commit 1d148e5939
1 changed files with 30 additions and 24 deletions
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54
fs/btrfs/delayed-ref.c
View File

@ -85,6 +85,34 @@ static int comp_data_refs(struct btrfs_delayed_data_ref *ref1,
return 0;
}
static int comp_refs(struct btrfs_delayed_ref_node *ref1,
struct btrfs_delayed_ref_node *ref2,
bool check_seq)
{
int ret = 0;
if (ref1->type < ref2->type)
return -1;
if (ref1->type > ref2->type)
return 1;
if (ref1->type == BTRFS_TREE_BLOCK_REF_KEY ||
ref1->type == BTRFS_SHARED_BLOCK_REF_KEY)
ret = comp_tree_refs(btrfs_delayed_node_to_tree_ref(ref1),
btrfs_delayed_node_to_tree_ref(ref2));
else
ret = comp_data_refs(btrfs_delayed_node_to_data_ref(ref1),
btrfs_delayed_node_to_data_ref(ref2));
if (ret)
return ret;
if (check_seq) {
if (ref1->seq < ref2->seq)
return -1;
if (ref1->seq > ref2->seq)
return 1;
}
return 0;
}
/* insert a new ref to head ref rbtree */
static struct btrfs_delayed_ref_head *htree_insert(struct rb_root *root,
struct rb_node *node)
@ -217,18 +245,7 @@ static bool merge_ref(struct btrfs_trans_handle *trans,
if (seq && next->seq >= seq)
goto next;
if (next->type != ref->type)
goto next;
if ((ref->type == BTRFS_TREE_BLOCK_REF_KEY ||
ref->type == BTRFS_SHARED_BLOCK_REF_KEY) &&
comp_tree_refs(btrfs_delayed_node_to_tree_ref(ref),
btrfs_delayed_node_to_tree_ref(next)))
goto next;
if ((ref->type == BTRFS_EXTENT_DATA_REF_KEY ||
ref->type == BTRFS_SHARED_DATA_REF_KEY) &&
comp_data_refs(btrfs_delayed_node_to_data_ref(ref),
btrfs_delayed_node_to_data_ref(next)))
if (comp_refs(ref, next, false))
goto next;
if (ref->action == next->action) {
@ -402,18 +419,7 @@ add_delayed_ref_tail_merge(struct btrfs_trans_handle *trans,
exist = list_entry(href->ref_list.prev, struct btrfs_delayed_ref_node,
list);
/* No need to compare bytenr nor is_head */
if (exist->type != ref->type || exist->seq != ref->seq)
goto add_tail;
if ((exist->type == BTRFS_TREE_BLOCK_REF_KEY ||
exist->type == BTRFS_SHARED_BLOCK_REF_KEY) &&
comp_tree_refs(btrfs_delayed_node_to_tree_ref(exist),
btrfs_delayed_node_to_tree_ref(ref)))
goto add_tail;
if ((exist->type == BTRFS_EXTENT_DATA_REF_KEY ||
exist->type == BTRFS_SHARED_DATA_REF_KEY) &&
comp_data_refs(btrfs_delayed_node_to_data_ref(exist),
btrfs_delayed_node_to_data_ref(ref)))
if (comp_refs(exist, ref, true))
goto add_tail;
/* Now we are sure we can merge */