From: Xuehan Xu <xuxuehan@qianxin.com>
Date: Mon, 18 Mar 2024 09:24:02 +0000 (+0800)
Subject: crimson/os/seastore/cached_extent: add comments to elaborate why
X-Git-Tag: v19.1.1~365^2~1
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=f28a391d7fbe22857c819455e3dd235bbf16627f;p=ceph.git

crimson/os/seastore/cached_extent: add comments to elaborate why
MUTATION_PENDING and under-io extents are "stable"

Signed-off-by: Xuehan Xu <xuxuehan@qianxin.com>
(cherry picked from commit b1c59ca077597e14a053d47d4961b12ba7a2a1b0)
---

diff --git a/src/crimson/os/seastore/cached_extent.h b/src/crimson/os/seastore/cached_extent.h
index 18ddbd95796c..730a0ace9a0b 100644
--- a/src/crimson/os/seastore/cached_extent.h
+++ b/src/crimson/os/seastore/cached_extent.h
@@ -426,6 +426,9 @@ public:
   /// Returns true if extent is stable and shared among transactions
   bool is_stable() const {
     return is_stable_written() ||
+	   // MUTATION_PENDING and under-io extents are to-be-stable extents,
+	   // for the sake of caveats that checks the correctness of extents
+	   // states, we consider them stable.
            (is_mutation_pending() &&
             is_pending_io());
   }