Remove non used pb messege part

src/yb/fs/fs.proto

@@ -53,76 +53,3 @@ message InstanceMetadataPB {
 
   // TODO: add a "node type" (TS/Master?)
 }
-
-// Describes a collection of filesystem path instances and the membership of a
-// particular instance in the collection.
-//
-// In a healthy filesystem (see below), a path instance can be referred to via
-// its UUID's position in all_uuids instead of via the UUID itself. This is
-// useful when there are many such references, as the position is much shorter
-// than the UUID.
-message PathSetPB {
-  // Globally unique identifier for this path instance.
-  required bytes uuid = 1;
-
-  // All UUIDs in this path instance set. In a healthy filesystem:
-  // 1. There exists an on-disk PathInstanceMetadataPB for each listed UUID, and
-  // 2. Every PathSetPB contains an identical copy of all_uuids.
-  repeated bytes all_uuids = 2;
-}
-
-// A filesystem instance can contain multiple paths. One of these structures
-// is persisted in each path when the filesystem instance is created.
-message PathInstanceMetadataPB {
-  // Describes this path instance as well as all of the other path instances
-  // that, taken together, describe a complete set.
-  required PathSetPB path_set = 1;
-
-  // Textual representation of the block manager that formatted this path.
-  required string block_manager_type = 2;
-
-  // Block size on the filesystem where this instance was created. If the
-  // instance (and its data) are ever copied to another location, the block
-  // size in that location must be the same.
-  required uint64 filesystem_block_size_bytes = 3;
-}
-
-message BlockIdPB {
-  required fixed64 id = 1;
-}
-
-// The kind of record.
-enum BlockRecordType {
-  UNKNOWN = 0;
-  CREATE = 1;
-  DELETE = 2;
-}
-
-// An element found in a container metadata file of the log-backed block
-// storage implementation.
-//
-// Each one tracks the existence (creation) or non-existence (deletion)
-// of a particular block. They are written sequentially, with subsequent
-// messages taking precedence over earlier ones (e.g. "CREATE foo" followed
-// by "DELETE foo" means that block foo does not exist).
-message BlockRecordPB {
-  // The unique identifier of the block.
-  required BlockIdPB block_id = 1;
-
-  // Whether this is a CREATE or a DELETE.
-  required BlockRecordType op_type = 2;
-
-  // The time at which this block record was created, expressed in terms of
-  // microseconds since the epoch.
-  required uint64 timestamp_us = 3;
-
-  // The offset of the block in the container data file.
-  //
-  // Required for CREATE.
-  optional int64 offset = 4;
-
-  // The length of the block in the container data file.
-  //
-  // Required for CREATE.
-  optional int64 length = 5;
-}