From f3b8b52550e4ac8f943bac27adf35902c3371b16 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Lu=C3=ADs=20Henriques?= <lhenriques@suse.de>
Date: Wed, 2 Mar 2022 16:46:16 +0000
Subject: [PATCH] mds: add support for snapshots alternate_name
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Signed-off-by: Luís Henriques <lhenriques@suse.de>
---
 src/mds/Server.cc | 3 +++
 src/mds/snap.cc   | 8 ++++++--
 src/mds/snap.h    | 1 +
 3 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/src/mds/Server.cc b/src/mds/Server.cc
index b87264c3ee3ec..7eef27352f47e 100644
--- a/src/mds/Server.cc
+++ b/src/mds/Server.cc
@@ -10332,8 +10332,10 @@ void Server::handle_client_lssnap(MDRequestRef& mdr)
       break;
 
     encode(snap_name, dnbl);
+
     //infinite lease
     LeaseStat e(CEPH_LEASE_VALID, -1, 0);
+    e.alternate_name = std::string(p->second->alternate_name);
     mds->locker->encode_lease(dnbl, mdr->session->info, e);
     dout(20) << "encode_infinite_lease" << dendl;
 
@@ -10496,6 +10498,7 @@ void Server::handle_client_mksnap(MDRequestRef& mdr)
   info.ino = diri->ino();
   info.snapid = snapid;
   info.name = snapname;
+  info.alternate_name = req->get_alternate_name();
   info.stamp = mdr->get_op_stamp();
   info.metadata = payload.metadata;
 
diff --git a/src/mds/snap.cc b/src/mds/snap.cc
index c5b8728e92714..625e345e890ef 100644
--- a/src/mds/snap.cc
+++ b/src/mds/snap.cc
@@ -25,18 +25,19 @@ using namespace std;
 
 void SnapInfo::encode(bufferlist& bl) const
 {
-  ENCODE_START(3, 2, bl);
+  ENCODE_START(4, 2, bl);
   encode(snapid, bl);
   encode(ino, bl);
   encode(stamp, bl);
   encode(name, bl);
   encode(metadata, bl);
+  encode(alternate_name, bl);
   ENCODE_FINISH(bl);
 }
 
 void SnapInfo::decode(bufferlist::const_iterator& bl)
 {
-  DECODE_START_LEGACY_COMPAT_LEN(3, 2, 2, bl);
+  DECODE_START_LEGACY_COMPAT_LEN(4, 2, 2, bl);
   decode(snapid, bl);
   decode(ino, bl);
   decode(stamp, bl);
@@ -44,6 +45,9 @@ void SnapInfo::decode(bufferlist::const_iterator& bl)
   if (struct_v >= 3) {
     decode(metadata, bl);
   }
+  if (struct_v >= 4) {
+    decode(alternate_name, bl);
+  }
   DECODE_FINISH(bl);
 }
 
diff --git a/src/mds/snap.h b/src/mds/snap.h
index f8b5b701af46f..012e944d92d32 100644
--- a/src/mds/snap.h
+++ b/src/mds/snap.h
@@ -38,6 +38,7 @@ struct SnapInfo {
   inodeno_t ino;
   utime_t stamp;
   std::string name;
+  std::string alternate_name;
 
   mutable std::string long_name; ///< cached _$ino_$name
   std::map<std::string,std::string> metadata;