Commit 265f7237 authored by Johannes Thumshirn's avatar Johannes Thumshirn Committed by David Sterba
Browse files

btrfs: zoned: allow DUP on meta-data block groups 



Allow creating or reading block-groups on a zoned device with DUP as a
meta-data profile.

This works because we're using the zoned_meta_io_lock and REQ_OP_WRITE
operations for meta-data on zoned btrfs, so all writes to meta-data zones
are aligned to the zone's write-pointer.

Upon loading of the block-group, it is ensured both zones do have the same
zone capacity and write-pointer offsets, so no extra machinery is needed
to keep the write-pointers in sync for the meta-data zones. If this
prerequisite is not met, loading of the block-group is refused.

Signed-off-by: default avatarJohannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent dbfcc18f

fs/btrfs/zoned.c

+36 −0
Original line number Diff line number Diff line
@@ -1419,6 +1419,42 @@ int btrfs_load_block_group_zone_info(struct btrfs_block_group *cache, bool new) 
		cache->zone_is_active = test_bit(0, active);

		break;

	case BTRFS_BLOCK_GROUP_DUP:

		if (map->type & BTRFS_BLOCK_GROUP_DATA) {

			btrfs_err(fs_info, "zoned: profile DUP not yet supported on data bg");

			ret = -EINVAL;

			goto out;

		}

		if (alloc_offsets[0] == WP_MISSING_DEV) {

			btrfs_err(fs_info,

			"zoned: cannot recover write pointer for zone %llu",

				physical[0]);

			ret = -EIO;

			goto out;

		}

		if (alloc_offsets[1] == WP_MISSING_DEV) {

			btrfs_err(fs_info,

			"zoned: cannot recover write pointer for zone %llu",

				physical[1]);

			ret = -EIO;

			goto out;

		}

		if (alloc_offsets[0] != alloc_offsets[1]) {

			btrfs_err(fs_info,

			"zoned: write pointer offset mismatch of zones in DUP profile");

			ret = -EIO;

			goto out;

		}

		if (test_bit(0, active) != test_bit(1, active)) {

			if (!btrfs_zone_activate(cache)) {

				ret = -EIO;

				goto out;

			}

		} else {

			cache->zone_is_active = test_bit(0, active);

		}

		cache->alloc_offset = alloc_offsets[0];

		cache->zone_capacity = min(caps[0], caps[1]);

		break;

	case BTRFS_BLOCK_GROUP_RAID1:

	case BTRFS_BLOCK_GROUP_RAID0:

	case BTRFS_BLOCK_GROUP_RAID10: