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

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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: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Johannes Thumshirn 2022-01-26 05:46:23 -08:00 committed by David Sterba
parent dbfcc18f27
commit 265f7237dd
1 changed files with 36 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

36
fs/btrfs/zoned.c
View file

@ -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); cache->zone_is_active = test_bit(0, active);
break; break;
case BTRFS_BLOCK_GROUP_DUP: 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_RAID1:
case BTRFS_BLOCK_GROUP_RAID0: case BTRFS_BLOCK_GROUP_RAID0:
case BTRFS_BLOCK_GROUP_RAID10: case BTRFS_BLOCK_GROUP_RAID10: