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btrfs: cleanup, stop casting for extent_map->lookup everywhere

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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>
This commit is contained in:
Jeff Mahoney 2015-06-03 10:55:48 -04:00 • committed by David Sterba
commit 95617d6932
6 changed files with 25 additions and 17 deletions
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10
fs/btrfs/extent_map.h
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@ -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;