f2fs: introduce infra macro and data structure of rb-tree extent cache
Introduce infra macro and data structure for rb-tree based extent cache: Macros: * EXT_TREE_VEC_SIZE: indicate vector size for gang lookup in extent tree. * F2FS_MIN_EXTENT_LEN: indicate minimum length of extent managed in cache. * EXTENT_CACHE_SHRINK_NUMBER: indicate number of extent in cache will be shrunk. Basic data structures for extent cache: * struct extent_tree: extent tree entry per inode. * struct extent_node: extent info node linked in extent tree. Besides, adding new extent cache related fields in f2fs_sb_info. Signed-off-by:Chao Yu <chao2.yu@samsung.com> Signed-off-by:
Changman Lee <cm224.lee@samsung.com> Signed-off-by:
Jaegeuk Kim <jaegeuk@kernel.org>
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7e4dde79