diff options
Diffstat (limited to 'fs/btrfs/backref.h')
| -rw-r--r-- | fs/btrfs/backref.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/fs/btrfs/backref.h b/fs/btrfs/backref.h index 4f140a0ebe1c..01c559543133 100644 --- a/fs/btrfs/backref.h +++ b/fs/btrfs/backref.h @@ -275,4 +275,20 @@ struct btrfs_backref_node *btrfs_backref_alloc_node( struct btrfs_backref_edge *btrfs_backref_alloc_edge( struct btrfs_backref_cache *cache); +#define LINK_LOWER (1 << 0) +#define LINK_UPPER (1 << 1) +static inline void btrfs_backref_link_edge(struct btrfs_backref_edge *edge, + struct btrfs_backref_node *lower, + struct btrfs_backref_node *upper, + int link_which) +{ + ASSERT(upper && lower && upper->level == lower->level + 1); + edge->node[LOWER] = lower; + edge->node[UPPER] = upper; + if (link_which & LINK_LOWER) + list_add_tail(&edge->list[LOWER], &lower->upper); + if (link_which & LINK_UPPER) + list_add_tail(&edge->list[UPPER], &upper->lower); +} + #endif |