From e61de1e08f751fce0ff6075e45b49c4aafc83434 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>
(cherry picked from commit 5635f25dd4a134f2fb32d2cb9dd73c0e947295e6)

Conflicts:
	src/client/Client.cc
	  - add .hidden member because we still need it
            in nautilus
	src/client/Client.h
	  - drop the mirror.info xattr related code
            because nautilus does not introduce it
---
 src/client/Client.cc | 40 ++++++++++++++++++++++++++++++++++++++++
 src/client/Client.h  |  4 ++++
 2 files changed, 44 insertions(+)

diff --git a/src/client/Client.cc b/src/client/Client.cc
index 2c56b9d3893..187413229ae 100755
--- a/src/client/Client.cc
+++ b/src/client/Client.cc
@@ -11938,6 +11938,17 @@ size_t Client::_vxattrcb_snap_btime(Inode *in, char *val, size_t size)
       (long unsigned)in->snap_btime.nsec());
 }
 
+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
 
@@ -12054,6 +12065,26 @@ 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,
+    hidden: false,
+    exists_cb: nullptr,
+    flags: 0,
+  },
+  {
+    name: "ceph.client_id",
+    getxattr_cb: &Client::_vxattrcb_client_id,
+    readonly: true,
+    hidden: false,
+    exists_cb: nullptr,
+    flags: 0,
+  },
+  { name: "" }     /* Required table terminator */
+};
+
 const Client::VXattr *Client::_get_vxattrs(Inode *in)
 {
   if (in->is_dir())
@@ -12074,7 +12105,16 @@ 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 9c4f02c0447..2749cc42b56 100644
--- a/src/client/Client.h
+++ b/src/client/Client.h
@@ -1008,6 +1008,7 @@ private:
 
   static const VXattr _dir_vxattrs[];
   static const VXattr _file_vxattrs[];
+  static const VXattr _common_vxattrs[];
 
 
 
@@ -1157,6 +1158,9 @@ private:
   bool _vxattrcb_snap_btime_exists(Inode *in);
   size_t _vxattrcb_snap_btime(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