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Commit 5ce5b3c0 authored by Ilya Dryomov's avatar Ilya Dryomov
Browse files

Btrfs: usage filter 



Select chunks that are less than X percent full.

Signed-off-by: default avatarIlya Dryomov <idryomov@gmail.com>
parent ed25e9b2

fs/btrfs/volumes.c

+36 −0
Original line number Original line Diff line number Diff line
@@ -2120,6 +2120,36 @@ static int chunk_profiles_filter(u64 chunk_profile, 
	return 1;

	return 1;

}

}





static u64 div_factor_fine(u64 num, int factor)

{

	if (factor <= 0)

		return 0;

	if (factor >= 100)

		return num;



	num *= factor;

	do_div(num, 100);

	return num;

}



static int chunk_usage_filter(struct btrfs_fs_info *fs_info, u64 chunk_offset,

			      struct btrfs_balance_args *bargs)

{

	struct btrfs_block_group_cache *cache;

	u64 chunk_used, user_thresh;

	int ret = 1;



	cache = btrfs_lookup_block_group(fs_info, chunk_offset);

	chunk_used = btrfs_block_group_used(&cache->item);



	user_thresh = div_factor_fine(cache->key.offset, bargs->usage);

	if (chunk_used < user_thresh)

		ret = 0;



	btrfs_put_block_group(cache);

	return ret;

}



static int should_balance_chunk(struct btrfs_root *root,

static int should_balance_chunk(struct btrfs_root *root,

				struct extent_buffer *leaf,

				struct extent_buffer *leaf,

				struct btrfs_chunk *chunk, u64 chunk_offset)

				struct btrfs_chunk *chunk, u64 chunk_offset)
@@ -2147,6 +2177,12 @@ static int should_balance_chunk(struct btrfs_root *root, 
		return 0;

		return 0;

	}

	}





	/* usage filter */

	if ((bargs->flags & BTRFS_BALANCE_ARGS_USAGE) &&

	    chunk_usage_filter(bctl->fs_info, chunk_offset, bargs)) {

		return 0;

	}



	return 1;

	return 1;

}

}

fs/btrfs/volumes.h

+1 −0
Original line number Original line Diff line number Diff line
@@ -200,6 +200,7 @@ struct map_lookup { 
 * Balance filters

 * Balance filters

 */

 */

#define BTRFS_BALANCE_ARGS_PROFILES	(1ULL << 0)

#define BTRFS_BALANCE_ARGS_PROFILES	(1ULL << 0)

#define BTRFS_BALANCE_ARGS_USAGE	(1ULL << 1)





struct btrfs_balance_args;

struct btrfs_balance_args;

struct btrfs_balance_control {

struct btrfs_balance_control {