From 5635f25dd4a134f2fb32d2cb9dd73c0e947295e6 Mon Sep 17 00:00:00 2001
From: Xiubo Li <xiubli@redhat.com>
Date: Tue, 24 Nov 2020 16:49:06 +0800
Subject: [PATCH] client: add ceph.{cluster_fsid/client_id} vxattrs suppport

These two vxattrs will only exist in local client side, with which
we can easily know which mountpoint the file belongs to and also
they can help locate the debugfs path quickly.

Fixes: https://tracker.ceph.com/issues/48337
Signed-off-by: Xiubo Li <xiubli@redhat.com>
---
 src/client/Client.cc | 38 ++++++++++++++++++++++++++++++++++++++
 src/client/Client.h  |  4 ++++
 2 files changed, 42 insertions(+)

diff --git a/src/client/Client.cc b/src/client/Client.cc
index aaf9db20c354..a7e745523c51 100644
--- a/src/client/Client.cc
+++ b/src/client/Client.cc
@@ -12376,6 +12376,17 @@ size_t Client::_vxattrcb_mirror_info(Inode *in, char *val, size_t size)
                   in->xattrs["ceph.mirror.info.fs_id"].c_str());
 }
 
+size_t Client::_vxattrcb_cluster_fsid(Inode *in, char *val, size_t size)
+{
+  return snprintf(val, size, "%s", monclient->get_fsid().to_string().c_str());
+}
+
+size_t Client::_vxattrcb_client_id(Inode *in, char *val, size_t size)
+{
+  auto name = messenger->get_myname();
+  return snprintf(val, size, "%s%ld", name.type_str(), name.num());
+}
+
 #define CEPH_XATTR_NAME(_type, _name) "ceph." #_type "." #_name
 #define CEPH_XATTR_NAME2(_type, _name, _name2) "ceph." #_type "." #_name "." #_name2
 
@@ -12490,6 +12501,24 @@ const Client::VXattr Client::_file_vxattrs[] = {
   { name: "" }     /* Required table terminator */
 };
 
+const Client::VXattr Client::_common_vxattrs[] = {
+  {
+    name: "ceph.cluster_fsid",
+    getxattr_cb: &Client::_vxattrcb_cluster_fsid,
+    readonly: true,
+    exists_cb: nullptr,
+    flags: 0,
+  },
+  {
+    name: "ceph.client_id",
+    getxattr_cb: &Client::_vxattrcb_client_id,
+    readonly: true,
+    exists_cb: nullptr,
+    flags: 0,
+  },
+  { name: "" }     /* Required table terminator */
+};
+
 const Client::VXattr *Client::_get_vxattrs(Inode *in)
 {
   if (in->is_dir())
@@ -12510,7 +12539,16 @@ const Client::VXattr *Client::_match_vxattr(Inode *in, const char *name)
 	vxattr++;
       }
     }
+
+    // for common vxattrs
+    vxattr = _common_vxattrs;
+    while (!vxattr->name.empty()) {
+      if (vxattr->name == name)
+        return vxattr;
+      vxattr++;
+    }
   }
+
   return NULL;
 }
 
diff --git a/src/client/Client.h b/src/client/Client.h
index 01f469ea1baa..c94fc6ea7fa9 100644
--- a/src/client/Client.h
+++ b/src/client/Client.h
@@ -1167,6 +1167,7 @@ private:
 
   static const VXattr _dir_vxattrs[];
   static const VXattr _file_vxattrs[];
+  static const VXattr _common_vxattrs[];
 
 
 
@@ -1324,6 +1325,9 @@ private:
   bool _vxattrcb_mirror_info_exists(Inode *in);
   size_t _vxattrcb_mirror_info(Inode *in, char *val, size_t size);
 
+  size_t _vxattrcb_cluster_fsid(Inode *in, char *val, size_t size);
+  size_t _vxattrcb_client_id(Inode *in, char *val, size_t size);
+
   static const VXattr *_get_vxattrs(Inode *in);
   static const VXattr *_match_vxattr(Inode *in, const char *name);
 
-- 
2.47.3