From f3d484b8dff0e522fc056cf71b29422bbb647fc4 Mon Sep 17 00:00:00 2001
From: taodd <tdd21151186@gmail.com>
Date: Thu, 14 Jun 2018 21:13:46 +0800
Subject: [PATCH] mds: add dump inode command

dump inode with an specific inode number
this is useful when we only known the inode number.

Signed-off-by: dongdong tao <tdd21151186@gmail.com>
---
 src/mds/MDCache.cc   | 10 ++++++++++
 src/mds/MDCache.h    |  1 +
 src/mds/MDSDaemon.cc |  6 ++++++
 src/mds/MDSRank.cc   | 18 ++++++++++++++++++
 src/mds/MDSRank.h    |  1 +
 5 files changed, 36 insertions(+)

diff --git a/src/mds/MDCache.cc b/src/mds/MDCache.cc
index 43628c36655ee..26d76c52a098b 100644
--- a/src/mds/MDCache.cc
+++ b/src/mds/MDCache.cc
@@ -12829,3 +12829,13 @@ void MDCache::clear_dirty_bits_for_stray(CInode* diri) {
   }
 }
 
+bool MDCache::dump_inode(Formatter *f, uint64_t number) {
+  CInode *in = get_inode(number);
+  if (!in) {
+    return false;
+  }
+  f->open_object_section("inode");
+  in->dump(f, CInode::DUMP_DEFAULT | CInode::DUMP_PATH);
+  f->close_section();
+  return true;
+}
diff --git a/src/mds/MDCache.h b/src/mds/MDCache.h
index 1b2379d7816b5..cfe656a803b12 100644
--- a/src/mds/MDCache.h
+++ b/src/mds/MDCache.h
@@ -543,6 +543,7 @@ public:
 
   void clean_open_file_lists();
   void dump_openfiles(Formatter *f);
+  bool dump_inode(Formatter *f, uint64_t number);
 protected:
   // [rejoin]
   bool rejoins_pending;
diff --git a/src/mds/MDSDaemon.cc b/src/mds/MDSDaemon.cc
index 0bc7cf68d9113..c40a3cb00683e 100644
--- a/src/mds/MDSDaemon.cc
+++ b/src/mds/MDSDaemon.cc
@@ -323,6 +323,12 @@ void MDSDaemon::set_up_admin_socket()
                                      asok_hook,
                                      "List the opening files and their caps");
   assert(r == 0);
+  r = admin_socket->register_command("dump inode",
+				     "dump inode " 
+                                     "name=number,type=CephInt,req=true",
+				     asok_hook,
+				     "dump inode by inode number");
+  assert(r == 0);
 }
 
 void MDSDaemon::clean_up_admin_socket()
diff --git a/src/mds/MDSRank.cc b/src/mds/MDSRank.cc
index 10cfc04a2143e..22112143def01 100644
--- a/src/mds/MDSRank.cc
+++ b/src/mds/MDSRank.cc
@@ -2127,6 +2127,8 @@ bool MDSRankDispatcher::handle_asok_command(std::string_view command,
     command_dirfrag_ls(cmdmap, ss, f);
   } else if (command == "openfiles ls") {
     command_openfiles_ls(f);
+  } else if (command == "dump inode") {
+    command_dump_inode(f, cmdmap, ss);
   } else {
     return false;
   }
@@ -2657,6 +2659,22 @@ void MDSRank::command_openfiles_ls(Formatter *f)
   mdcache->dump_openfiles(f);
 }
 
+void MDSRank::command_dump_inode(Formatter *f, const cmdmap_t &cmdmap, std::ostream &ss)
+{
+  Mutex::Locker l(mds_lock);
+  int64_t number;
+  bool got = cmd_getval(g_ceph_context, cmdmap, "number", number);
+  if (!got) {
+    ss << "missing inode number";
+    return;
+  }
+  
+  bool success = mdcache->dump_inode(f, number);
+  if (!success) {
+    ss << "dump inode failed, wrong inode number or the inode is not cached";
+  }
+}
+
 void MDSRank::dump_status(Formatter *f) const
 {
   if (state == MDSMap::STATE_REPLAY ||
diff --git a/src/mds/MDSRank.h b/src/mds/MDSRank.h
index 60a624bebf86e..69a40ce3fda22 100644
--- a/src/mds/MDSRank.h
+++ b/src/mds/MDSRank.h
@@ -464,6 +464,7 @@ class MDSRank {
         std::ostream &ss);
     void command_openfiles_ls(Formatter *f);
     void command_dump_tree(const cmdmap_t &cmdmap, std::ostream &ss, Formatter *f);
+    void command_dump_inode(Formatter *f, const cmdmap_t &cmdmap, std::ostream &ss);
 
   protected:
     Messenger    *messenger;
-- 
2.39.5