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btrfs-progs: backref: add list_first_pref helper

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Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Jeff Mahoney 2017-07-25 16:51:36 -04:00 committed by David Sterba
parent 3ae36b3b0f
commit e520de0dbb
1 changed files with 7 additions and 4 deletions
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11
backref.c
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@ -130,6 +130,11 @@ struct __prelim_ref {
u64 wanted_disk_byte;
};
static struct __prelim_ref *list_first_pref(struct list_head *head)
{
return list_first_entry(head, struct __prelim_ref, list);
}
struct pref_state {
struct list_head pending;
};
@ -803,8 +808,7 @@ static int find_parent_nodes(struct btrfs_trans_handle *trans,
__merge_refs(&prefstate, 2);
while (!list_empty(&prefstate.pending)) {
ref = list_first_entry(&prefstate.pending,
struct __prelim_ref, list);
ref = list_first_pref(&prefstate.pending);
WARN_ON(ref->count < 0);
if (roots && ref->count && ref->root_id && ref->parent == 0) {
/* no parent == root of tree */
@ -854,8 +858,7 @@ static int find_parent_nodes(struct btrfs_trans_handle *trans,
out:
btrfs_free_path(path);
while (!list_empty(&prefstate.pending)) {
ref = list_first_entry(&prefstate.pending,
struct __prelim_ref, list);
ref = list_first_pref(&prefstate.pending);
list_del(&ref->list);
kfree(ref);
}