[RFC ONLY 7/8] btrfs: zoned: allow zoned RAID1

Johannes Thumshirn
2022-05-16T14:32:02Z

When we have a raid-stripe-tree, we can do RAID1 on zoned devices for data
block-groups. For meta-data block-groups, we don't actually need
anything special, as all meta-data I/O is protected by the
btrfs_zoned_meta_io_lock() already.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
---
fs/btrfs/zoned.c | 39 +++++++++++++++++++++++++++++++++++++++
1 file changed, 39 insertions(+)

diff --git a/fs/btrfs/zoned.c b/fs/btrfs/zoned.c
index 1b1b310c3c51..d817a3349595 100644
--- a/fs/btrfs/zoned.c
+++ b/fs/btrfs/zoned.c
@@ -1455,6 +1455,45 @@ int btrfs_load_block_group_zone_info(struct btrfs_block_group *cache, bool new)
cache->zone_capacity = min(caps[0], caps[1]);
break;
case BTRFS_BLOCK_GROUP_RAID1:
+ case BTRFS_BLOCK_GROUP_RAID1C3:
+ case BTRFS_BLOCK_GROUP_RAID1C4:
+ if (map->type & BTRFS_BLOCK_GROUP_DATA &&
+ !fs_info->stripe_root) {
+ btrfs_err(fs_info,
+ "zoned: data RAID1 needs stripe_root");
+ ret = -EIO;
+ goto out;
+
+ }
+
+ for (i = 0; i < map->num_stripes; i++) {
+ if (alloc_offsets[i] == WP_MISSING_DEV) {
+ btrfs_err(fs_info,
+ "zoned: cannot recover write pointer for zone %llu",
+ physical[0]);
+ ret = -EIO;
+ goto out;
+ }
+ if (i == 0)
+ continue;
+
+ if (alloc_offsets[0] != alloc_offsets[i]) {
+ btrfs_err(fs_info,
+ "zoned: write pointer offset mismatch of zones in RAID profile");
+ ret = -EIO;
+ goto out;
+ }
+ if (test_bit(0, active) != test_bit(i, active)) {
+ if (!btrfs_zone_activate(cache)) {
+ ret = -EIO;
+ goto out;
+ }
+ }
+ cache->zone_capacity = min(caps[0], caps[i]);
+ }
+ cache->zone_is_active = test_bit(0, active);
+ cache->alloc_offset = alloc_offsets[0];
+ break;
case BTRFS_BLOCK_GROUP_RAID0:
case BTRFS_BLOCK_GROUP_RAID10:
case BTRFS_BLOCK_GROUP_RAID5:
--
2.35.1