mds: notify the xattr_version to replica MDSes

When one client changes a xattr's value in the auth MDS, when replying
to the client the MDS possibly will drop the increased xattr_version
and new value in the reply message if no 'Xs' caps will be issued to
the client together.

And when the client wants to get this xattr's value, and if it sends
the request to a replicated MDS, since the replicated MDS still has
the old value of the xattr_version, and then the client will drop the
xattr value since xattr_version is not changed.

We need to notify the xattr_version to the replicated MDSes together
with the xattrs when notifying the lock state.

Fixes: https://tracker.ceph.com/issues/55331
Signed-off-by: Xiubo Li <xiubli@redhat.com>
(cherry picked from commit 363ee982f6513af2c018f14a02b73338fa9fc03b)

diff --git a/src/mds/CInode.cc b/src/mds/CInode.cc
index 370fdfbd47f632563d95f74c2eab214accd72b98..1231ca293624581b522e28f628d0bc47bee2b223 100644 (file)
--- a/src/mds/CInode.cc
+++ b/src/mds/CInode.cc
@@ -2037,10 +2037,11 @@ void CInode::decode_lock_inest(bufferlist::const_iterator& p)
 
 void CInode::encode_lock_ixattr(bufferlist& bl)
 {
-  ENCODE_START(1, 1, bl);
+  ENCODE_START(2, 1, bl);
   encode(get_inode()->version, bl);
   encode(get_inode()->ctime, bl);
   encode_xattrs(bl);
+  encode(get_inode()->xattr_version, bl);
   ENCODE_FINISH(bl);
 }
 
@@ -2048,13 +2049,16 @@ void CInode::decode_lock_ixattr(bufferlist::const_iterator& p)
 {
   ceph_assert(!is_auth());
   auto _inode = allocate_inode(*get_inode());
-  DECODE_START(1, p);
+  DECODE_START(2, p);
   decode(_inode->version, p);
   utime_t tm;
   decode(tm, p);
   if (_inode->ctime < tm)
     _inode->ctime = tm;
   decode_xattrs(p);
+  if (struct_v >= 2) {
+    decode(_inode->xattr_version, p);
+  }
   DECODE_FINISH(p);
   reset_inode(std::move(_inode));
 }