From: Xinyu Huang <xinyu.huang@intel.com>
Date: Wed, 19 Apr 2023 01:46:31 +0000 (+0000)
Subject: crimson/os/seastore: deepcopy the buffer of exist clean extent when duplicate_for_write
X-Git-Tag: v19.0.0~929^2~4
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=026066a7e5c4cc1bc04ed91003c553146a0b60ef;p=ceph.git

crimson/os/seastore: deepcopy the buffer of exist clean extent when duplicate_for_write

Beacuse exist clean extent shares buffer with original clean extent.

Signed-off-by: Xinyu Huang <xinyu.huang@intel.com>
---

diff --git a/src/crimson/os/seastore/cache.cc b/src/crimson/os/seastore/cache.cc
index 07000dc8f76e..0b0f5cd332e5 100644
--- a/src/crimson/os/seastore/cache.cc
+++ b/src/crimson/os/seastore/cache.cc
@@ -1012,6 +1012,12 @@ CachedExtentRef Cache::duplicate_for_write(
     i->version++;
     i->state = CachedExtent::extent_state_t::EXIST_MUTATION_PENDING;
     i->last_committed_crc = i->get_crc32c();
+    // deepcopy the buffer of exist clean extent beacuse it shares
+    // buffer with original clean extent.
+    auto bp = i->get_bptr();
+    auto nbp = ceph::bufferptr(bp.c_str(), bp.length());
+    i->set_bptr(std::move(nbp));
+
     t.add_mutated_extent(i);
     DEBUGT("duplicate existing extent {}", t, *i);
     return i;