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Commit c08782da authored by David Sterba's avatar David Sterba
Browse files

btrfs: fix structs where bitfields and spinlock/atomic share 8B word 

On ia64, powerpc64 and sparc64 the bitfield is modified through a RMW cycle and current
gcc rewrites the adjacent 4B word, which in case of a spinlock or atomic has
disaterous effect.

https://lkml.org/lkml/2012/2/1/220



Signed-off-by: default avatarDavid Sterba <dsterba@suse.cz>
parent 87826df0

fs/btrfs/ctree.h

+1 −1
Original line number Diff line number Diff line
@@ -886,7 +886,7 @@ struct btrfs_block_rsv { 
	u64 reserved;

	struct btrfs_space_info *space_info;

	spinlock_t lock;

	unsigned int full:1;

	unsigned int full;

};



/*

fs/btrfs/extent_map.h

+2 −2
Original line number Diff line number Diff line
@@ -26,8 +26,8 @@ struct extent_map { 
	unsigned long flags;

	struct block_device *bdev;

	atomic_t refs;

	unsigned int in_tree:1;

	unsigned int compress_type:4;

	unsigned int in_tree;

	unsigned int compress_type;

};



struct extent_map_tree {