Commit ea67176a authored by Ilya Dryomov's avatar Ilya Dryomov
Browse files

Btrfs: virtual address space subset filter 



Select chunks which have at least one byte located inside a given
[vstart, vend) virtual address space range.

Signed-off-by: default avatarIlya Dryomov <idryomov@gmail.com>
parent 94e60d5a

fs/btrfs/volumes.c

+20 −0
Original line number Diff line number Diff line
@@ -2207,6 +2207,20 @@ static int chunk_drange_filter(struct extent_buffer *leaf, 
	return 1;

}



/* [vstart, vend) */

static int chunk_vrange_filter(struct extent_buffer *leaf,

			       struct btrfs_chunk *chunk,

			       u64 chunk_offset,

			       struct btrfs_balance_args *bargs)

{

	if (chunk_offset < bargs->vend &&

	    chunk_offset + btrfs_chunk_length(leaf, chunk) > bargs->vstart)

		/* at least part of the chunk is inside this vrange */

		return 0;



	return 1;

}



static int should_balance_chunk(struct btrfs_root *root,

				struct extent_buffer *leaf,

				struct btrfs_chunk *chunk, u64 chunk_offset)
@@ -2252,6 +2266,12 @@ static int should_balance_chunk(struct btrfs_root *root, 
		return 0;

	}



	/* vrange filter */

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

	    chunk_vrange_filter(leaf, chunk, chunk_offset, bargs)) {

		return 0;

	}



	return 1;

}

fs/btrfs/volumes.h

+1 −0
Original line number Diff line number Diff line
@@ -203,6 +203,7 @@ struct map_lookup { 
#define BTRFS_BALANCE_ARGS_USAGE	(1ULL << 1)

#define BTRFS_BALANCE_ARGS_DEVID	(1ULL << 2)

#define BTRFS_BALANCE_ARGS_DRANGE	(1ULL << 3)

#define BTRFS_BALANCE_ARGS_VRANGE	(1ULL << 4)



struct btrfs_balance_args;

struct btrfs_balance_control {