Commit dee32d0a authored by Gabríel Arthúr Pétursson's avatar Gabríel Arthúr Pétursson Committed by Chris Mason
Browse files

btrfs: add balance filter for stripes 



Balance block groups which have the given number of stripes, defined by
a range min..max. This is useful to selectively rebalance only chunks
that do not span enough devices, applies to RAID0/10/5/6.

Signed-off-by: default avatarGabríel Arthúr Pétursson <gabriel@system.is>
[ renamed bargs members, added to the UAPI, wrote the changelog ]
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>

Signed-off-by: default avatarChris Mason <clm@fb.com>
parent 12907fc7

fs/btrfs/ctree.h

+8 −1
Original line number Diff line number Diff line
@@ -859,7 +859,14 @@ struct btrfs_disk_balance_args { 
		};

	};



	__le64 unused[7];

	/*

	 * Process chunks that cross stripes_min..stripes_max devices,

	 * BTRFS_BALANCE_ARGS_STRIPES_RANGE

	 */

	__le32 stripes_min;

	__le32 stripes_max;



	__le64 unused[6];

} __attribute__ ((__packed__));



/*

fs/btrfs/volumes.c

+19 −0
Original line number Diff line number Diff line
@@ -3220,6 +3220,19 @@ static int chunk_vrange_filter(struct extent_buffer *leaf, 
	return 1;

}



static int chunk_stripes_range_filter(struct extent_buffer *leaf,

			       struct btrfs_chunk *chunk,

			       struct btrfs_balance_args *bargs)

{

	int num_stripes = btrfs_chunk_num_stripes(leaf, chunk);



	if (bargs->stripes_min <= num_stripes

			&& num_stripes <= bargs->stripes_max)

		return 0;



	return 1;

}



static int chunk_soft_convert_filter(u64 chunk_type,

				     struct btrfs_balance_args *bargs)

{
@@ -3286,6 +3299,12 @@ static int should_balance_chunk(struct btrfs_root *root, 
		return 0;

	}



	/* stripes filter */

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

	    chunk_stripes_range_filter(leaf, chunk, bargs)) {

		return 0;

	}



	/* soft profile changing mode */

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

	    chunk_soft_convert_filter(chunk_type, bargs)) {

fs/btrfs/volumes.h

+1 −0
Original line number Diff line number Diff line
@@ -381,6 +381,7 @@ struct map_lookup { 
#define BTRFS_BALANCE_ARGS_VRANGE	(1ULL << 4)

#define BTRFS_BALANCE_ARGS_LIMIT	(1ULL << 5)

#define BTRFS_BALANCE_ARGS_LIMIT_RANGE	(1ULL << 6)

#define BTRFS_BALANCE_ARGS_STRIPES_RANGE (1ULL << 7)



#define BTRFS_BALANCE_ARGS_MASK			\

	(BTRFS_BALANCE_ARGS_PROFILES |		\

include/uapi/linux/btrfs.h

+9 −1
Original line number Diff line number Diff line
@@ -229,7 +229,15 @@ struct btrfs_balance_args { 
			__u32 limit_max;

		};

	};

	__u64 unused[7];



	/*

	 * Process chunks that cross stripes_min..stripes_max devices,

	 * BTRFS_BALANCE_ARGS_STRIPES_RANGE

	 */

	__le32 stripes_min;

	__le32 stripes_max;



	__u64 unused[6];

} __attribute__ ((__packed__));



/* report balance progress to userspace */

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