From c69c9539f628c61a1cf4cae6aadd39cb48a8b022 Mon Sep 17 00:00:00 2001
From: Sage Weil <sage@redhat.com>
Date: Wed, 7 Aug 2019 10:44:38 -0500
Subject: [PATCH] os/bluestore/BlueFS: add bluefs_shared_alloc_size

Add a separate config option that controls the alloc_size for the shared
device (BDEV_SLOW).

Signed-off-by: Sage Weil <sage@redhat.com>
---
 src/common/legacy_config_opts.h | 1 +
 src/common/options.cc           | 6 +++++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/common/legacy_config_opts.h b/src/common/legacy_config_opts.h
index 2215ec19c48..cb0ed47d548 100644
--- a/src/common/legacy_config_opts.h
+++ b/src/common/legacy_config_opts.h
@@ -926,6 +926,7 @@ OPTION(bdev_async_discard, OPT_BOOL)
 OPTION(objectstore_blackhole, OPT_BOOL)
 
 OPTION(bluefs_alloc_size, OPT_U64)
+OPTION(bluefs_shared_alloc_size, OPT_U64)
 OPTION(bluefs_max_prefetch, OPT_U64)
 OPTION(bluefs_min_log_runway, OPT_U64)  // alloc when we get this low
 OPTION(bluefs_max_log_runway, OPT_U64)  // alloc this much at a time
diff --git a/src/common/options.cc b/src/common/options.cc
index bcf4ab8c413..f99ebc782f0 100644
--- a/src/common/options.cc
+++ b/src/common/options.cc
@@ -4252,7 +4252,11 @@ std::vector<Option> get_global_options() {
 
     Option("bluefs_alloc_size", Option::TYPE_SIZE, Option::LEVEL_ADVANCED)
     .set_default(1_M)
-    .set_description(""),
+    .set_description("Allocation unit size for DB and WAL devices"),
+
+    Option("bluefs_shared_alloc_size", Option::TYPE_SIZE, Option::LEVEL_ADVANCED)
+    .set_default(64_K)
+    .set_description("Allocation unit size for primary/shared device"),
 
     Option("bluefs_max_prefetch", Option::TYPE_SIZE, Option::LEVEL_ADVANCED)
     .set_default(1_M)
-- 
2.39.5