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Commit 6079e12c authored by David Sterba's avatar David Sterba
Browse files

btrfs: use raid_attr table to find profiles for integrity lowering 



Replace open coded list of the profiles by selecting them from the
raid_attr table. The criteria are now more explicit, we need profiles
that have more than 1 copy of the data or can reconstruct the data with
a missing device.

Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 081db89b

fs/btrfs/volumes.c

+10 −5
Original line number Diff line number Diff line
@@ -4110,11 +4110,16 @@ int btrfs_balance(struct btrfs_fs_info *fs_info, 
		goto out;

	}



	/* allow to reduce meta or sys integrity only if force set */

	allowed = BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1 |

			BTRFS_BLOCK_GROUP_RAID10 |

			BTRFS_BLOCK_GROUP_RAID5 |

			BTRFS_BLOCK_GROUP_RAID6;

	/*

	 * Allow to reduce metadata or system integrity only if force set for

	 * profiles with redundancy (copies, parity)

	 */

	allowed = 0;

	for (i = 0; i < ARRAY_SIZE(btrfs_raid_array); i++) {

		if (btrfs_raid_array[i].ncopies >= 2 ||

		    btrfs_raid_array[i].tolerated_failures >= 1)

			allowed |= btrfs_raid_array[i].bg_flag;

	}

	do {

		seq = read_seqbegin(&fs_info->profiles_lock);