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Diffstat (limited to 'fs/btrfs/extent_map.h')
-rw-r--r--fs/btrfs/extent_map.h10
1 files changed, 9 insertions, 1 deletions
diff --git a/fs/btrfs/extent_map.h b/fs/btrfs/extent_map.h
index b2991fd85..eb8b8fae0 100644
--- a/fs/btrfs/extent_map.h
+++ b/fs/btrfs/extent_map.h
@@ -32,7 +32,15 @@ struct extent_map {
u64 block_len;
u64 generation;
unsigned long flags;
- struct block_device *bdev;
+ union {
+ struct block_device *bdev;
+
+ /*
+ * used for chunk mappings
+ * flags & EXTENT_FLAG_FS_MAPPING must be set
+ */
+ struct map_lookup *map_lookup;
+ };
atomic_t refs;
unsigned int compress_type;
struct list_head list;