Btrfs: shrink further sizeof(struct extent_buffer)
The map_start and map_len fields aren't used anywhere, so just remove them. On a x86_64 system, this reduced sizeof(struct extent_buffer) from 296 bytes to 280 bytes, and therefore 14 extent_buffer structs can now fit into a page instead of 13. Signed-off-by: Filipe Manana <fdmanana@suse.com> Reviewed-by: David Sterba <dsterba@suse.cz> Signed-off-by: Chris Mason <clm@fb.com>
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@ -125,8 +125,6 @@ struct extent_state {
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struct extent_buffer {
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u64 start;
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unsigned long len;
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unsigned long map_start;
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unsigned long map_len;
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unsigned long bflags;
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struct btrfs_fs_info *fs_info;
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spinlock_t refs_lock;
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