btrfs: introduce extent allocation policy (cb2f96f8) · Commits · 戴 / test

This commit introduces extent allocation policy for btrfs. This policy controls how btrfs allocate an extents from block groups. There is no functional change introduced with this commit. Reviewed-by:

Josef Bacik <josef@toxicpanda.com> Signed-off-by:

Naohiro Aota <naohiro.aota@wdc.com> Reviewed-by:

David Sterba <dsterba@suse.com> Signed-off-by:

David Sterba <dsterba@suse.com>

fs/btrfs/extent-tree.c

+8 −0

Original line number	Diff line number	Diff line
		@@ -3427,6 +3427,10 @@ btrfs_release_block_group(struct btrfs_block_group *cache,
		btrfs_put_block_group(cache);
		}

		enum btrfs_extent_allocation_policy {
		BTRFS_EXTENT_ALLOC_CLUSTERED,
		};

		/*
		* Structure used internally for find_free_extent() function. Wraps needed
		* parameters.
		@@ -3478,6 +3482,9 @@ struct find_free_extent_ctl {

		/* Found result */
		u64 found_offset;

		/* Allocation policy */
		enum btrfs_extent_allocation_policy policy;
		};


		@@ -3815,6 +3822,7 @@ static noinline int find_free_extent(struct btrfs_fs_info *fs_info,
		ffe_ctl.have_caching_bg = false;
		ffe_ctl.orig_have_caching_bg = false;
		ffe_ctl.found_offset = 0;
		ffe_ctl.policy = BTRFS_EXTENT_ALLOC_CLUSTERED;

		ins->type = BTRFS_EXTENT_ITEM_KEY;
		ins->objectid = 0;

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