From 9dff0bae5a266b6c41318e311c6459c9b45bf70d Mon Sep 17 00:00:00 2001
From: Xiubo Li <xiubli@redhat.com>
Date: Thu, 25 Nov 2021 08:52:37 +0800
Subject: [PATCH] mds: add mds_fscrypt_last_block_max_size option support

The maximum size of the last block without the header along with
a truncate request when the fscrypt is enabled. Default value is
4KB.

Signed-off-by: Xiubo Li <xiubli@redhat.com>
---
 src/common/options/mds.yaml.in | 10 ++++++++++
 src/mds/Server.cc              |  3 +++
 src/mds/Server.h               |  1 +
 3 files changed, 14 insertions(+)

diff --git a/src/common/options/mds.yaml.in b/src/common/options/mds.yaml.in
index cfe678ed464..4d12d5aad8a 100644
--- a/src/common/options/mds.yaml.in
+++ b/src/common/options/mds.yaml.in
@@ -11,6 +11,16 @@ options:
   - mds
   flags:
   - runtime
+- name: mds_fscrypt_last_block_max_size
+  type: size
+  level: advanced
+  desc: maximum size of the last block without the header along with a truncate
+    request when the fscrypt is enabled.
+  default: 4_K
+  services:
+  - mds
+  flags:
+  - runtime
 - name: mds_valgrind_exit
   type: bool
   level: dev
diff --git a/src/mds/Server.cc b/src/mds/Server.cc
index 31d8f216b7f..628241d754d 100644
--- a/src/mds/Server.cc
+++ b/src/mds/Server.cc
@@ -1259,6 +1259,9 @@ void Server::handle_conf_change(const std::set<std::string>& changed) {
   if (changed.count("mds_alternate_name_max")) {
     alternate_name_max  = g_conf().get_val<Option::size_t>("mds_alternate_name_max");
   }
+  if (changed.count("mds_fscrypt_last_block_max_size")) {
+    fscrypt_last_block_max_size = g_conf().get_val<Option::size_t>("mds_fscrypt_last_block_max_size");
+  }
   if (changed.count("mds_dir_max_entries")) {
     dir_max_entries = g_conf().get_val<uint64_t>("mds_dir_max_entries");
     dout(20) << __func__ << " max entries per directory changed to "
diff --git a/src/mds/Server.h b/src/mds/Server.h
index 76f38717c72..13e3d66d14c 100644
--- a/src/mds/Server.h
+++ b/src/mds/Server.h
@@ -475,6 +475,7 @@ private:
   double caps_throttle_retry_request_timeout;
 
   size_t alternate_name_max = g_conf().get_val<Option::size_t>("mds_alternate_name_max");
+  size_t fscrypt_last_block_max_size = g_conf().get_val<Option::size_t>("mds_fscrypt_last_block_max_size");
 };
 
 static inline constexpr auto operator|(Server::RecallFlags a, Server::RecallFlags b) {
-- 
2.47.3