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authorJeff Mahoney <jeffm@suse.com>2015-06-03 10:55:48 -0400
committerDavid Sterba <dsterba@suse.com>2016-01-15 19:22:28 +0100
commit95617d69326ce386c95e33db7aeb832b45ee9f8f (patch)
tree58b636c69bee4179da9b70fe66d448cf3605c1f0 /fs/btrfs/extent_map.h
parenta7ca42256d9fad572fb7f2c471514d7d3572b1db (diff)
btrfs: cleanup, stop casting for extent_map->lookup everywhere
Overloading extent_map->bdev to struct map_lookup * might have started out as a means to an end, but it's a pattern that's used all over the place now. Let's get rid of the casting and just add a union instead. Signed-off-by: Jeff Mahoney <jeffm@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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 b2991fd8583e..eb8b8fae036b 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;