This is the userland counterpart of the following series. https://lore.kernel.org/linux-btrfs/20200225035626.1049501-1-naohiro.a...@wdc.com/
This series refactors chunk allocation and device_extent allocation functions and make them generalized to be able to implement other allocation policy easily. On top of this series, we can simplify userland side of the zoned series as adding a new type of chunk allocator and extent allocator for zoned block devices. Furthermore, we will be able to implement and test some other allocator in the idea page of the wiki e.g. SSD caching, dedicated metadata drive, chunk allocation groups, and so on. This series also fixes a bug of calculating the stripe size in DUP profile, and cleans up the code. * Refactoring chunk/dev_extent allocator Two functions are separated from find_free_dev_extent_start(). dev_extent_search_start() decides the starting position of the search. dev_extent_hole_check() checks if a hole found is suitable for device extent allocation. Split some parts of btrfs_alloc_chunk() into three functions. init_alloc_chunk_policy() initializes the parameters of an allocation. decide_stripe_size() decides the size of chunk and device_extent. And, create_chunk() creates a chunk and device extents. * Patch organization Patches 1 and 2 refactor find_free_dev_extent_start(). Patches 3 to 6 refactor btrfs_alloc_chunk() by moving the code into three other functions. Patch 7 uses create_chunk() to simplify btrfs_alloc_data_chunk(). Patch 8 fixes a bug of calculating stripe size in DUP profile. Patches 9 to 12 clean up btrfs_alloc_chunk() code by dropping unnecessary parameters, and using better macro/variable name to clarify the meaning. Naohiro Aota (12): btrfs-progs: introduce chunk allocation policy btrfs-progs: refactor find_free_dev_extent_start() btrfs-progs: convert type of alloc_chunk_ctl::type btrfs-progs: consolidate parameter initialization of regular allocator btrfs-progs: factor out decide_stripe_size() btrfs-progs: factor out create_chunk() btrfs-progs: rewrite btrfs_alloc_data_chunk() using create_chunk() btrfs-progs: fix to use half the available space for DUP profile btrfs-progs: use round_down for allocation calcs btrfs-progs: drop alloc_chunk_ctl::stripe_len btrfs-progs: simplify arguments of chunk_bytes_by_type() btrfs-progs: rename calc_size to stripe_size kernel-shared/volumes.c | 514 +++++++++++++++++++++------------------- kernel-shared/volumes.h | 6 + 2 files changed, 274 insertions(+), 246 deletions(-) -- 2.31.1
