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Commit 94e60d5a authored by Ilya Dryomov's avatar Ilya Dryomov
Browse files

Btrfs: devid subset filter 



Select chunks which have at least one byte of at least one stripe
located on a device with devid X in a given [pstart,pend) physical
address range.

This filter only works when devid filter is turned on.

Signed-off-by: default avatarIlya Dryomov <idryomov@gmail.com>
parent 409d404b

fs/btrfs/volumes.c

+46 −0
Original line number Original line Diff line number Diff line
@@ -2167,6 +2167,46 @@ static int chunk_devid_filter(struct extent_buffer *leaf, 
	return 1;

	return 1;

}

}





/* [pstart, pend) */

static int chunk_drange_filter(struct extent_buffer *leaf,

			       struct btrfs_chunk *chunk,

			       u64 chunk_offset,

			       struct btrfs_balance_args *bargs)

{

	struct btrfs_stripe *stripe;

	int num_stripes = btrfs_chunk_num_stripes(leaf, chunk);

	u64 stripe_offset;

	u64 stripe_length;

	int factor;

	int i;



	if (!(bargs->flags & BTRFS_BALANCE_ARGS_DEVID))

		return 0;



	if (btrfs_chunk_type(leaf, chunk) & (BTRFS_BLOCK_GROUP_DUP |

	     BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10))

		factor = 2;

	else

		factor = 1;

	factor = num_stripes / factor;



	for (i = 0; i < num_stripes; i++) {

		stripe = btrfs_stripe_nr(chunk, i);

		if (btrfs_stripe_devid(leaf, stripe) != bargs->devid)

			continue;



		stripe_offset = btrfs_stripe_offset(leaf, stripe);

		stripe_length = btrfs_chunk_length(leaf, chunk);

		do_div(stripe_length, factor);



		if (stripe_offset < bargs->pend &&

		    stripe_offset + stripe_length > bargs->pstart)

			return 0;

	}



	return 1;

}



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)
@@ -2206,6 +2246,12 @@ static int should_balance_chunk(struct btrfs_root *root, 
		return 0;

		return 0;

	}

	}





	/* drange filter, makes sense only with devid filter */

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

	    chunk_drange_filter(leaf, chunk, 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
@@ -202,6 +202,7 @@ struct map_lookup { 
#define BTRFS_BALANCE_ARGS_PROFILES	(1ULL << 0)

#define BTRFS_BALANCE_ARGS_PROFILES	(1ULL << 0)

#define BTRFS_BALANCE_ARGS_USAGE	(1ULL << 1)

#define BTRFS_BALANCE_ARGS_USAGE	(1ULL << 1)

#define BTRFS_BALANCE_ARGS_DEVID	(1ULL << 2)

#define BTRFS_BALANCE_ARGS_DEVID	(1ULL << 2)

#define BTRFS_BALANCE_ARGS_DRANGE	(1ULL << 3)





struct btrfs_balance_args;

struct btrfs_balance_args;

struct btrfs_balance_control {

struct btrfs_balance_control {