Commit cb2f96f8 authored by Naohiro Aota's avatar Naohiro Aota Committed by David Sterba
Browse files

btrfs: introduce extent allocation policy 



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: default avatarJosef Bacik <josef@toxicpanda.com>
Signed-off-by: default avatarNaohiro Aota <naohiro.aota@wdc.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 6aafb303

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;