btrfs: use raid_attr table to find profiles for integrity lowering (6079e12c) · Commits · 戴 / test

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:

David Sterba <dsterba@suse.com>

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);

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