btrfs: zoned: fix btrfs_can_activate_zone() to support DUP profile

btrfs_can_activate_zone() returns true if at least one device has one zone
available for activation. This is OK for the single profile, but not OK for
DUP profile. We need two zones to create a DUP block group. Fix it by
properly handling the case with the profile flags.

Fixes: 265f723 ("btrfs: zoned: allow DUP on meta-data block groups")
CC: [email protected] # 6.1+
Reviewed-by: Johannes Thumshirn <[email protected]>
Signed-off-by: Naohiro Aota <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: David Sterba <[email protected]>

Author: naota

fs/btrfs/zoned.c

@@ -2086,11 +2086,21 @@ bool btrfs_can_activate_zone(struct btrfs_fs_devices *fs_devices, u64 flags)
 		if (!device->bdev)
 			continue;
 
-		if (!zinfo->max_active_zones ||
-		    atomic_read(&zinfo->active_zones_left)) {
+		if (!zinfo->max_active_zones) {
 			ret = true;
 			break;
 		}
+
+		switch (flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
+		case 0: /* single */
+			ret = (atomic_read(&zinfo->active_zones_left) >= 1);
+			break;
+		case BTRFS_BLOCK_GROUP_DUP:
+			ret = (atomic_read(&zinfo->active_zones_left) >= 2);
+			break;
+		}
+		if (ret)
+			break;
 	}
 	mutex_unlock(&fs_info->chunk_mutex);