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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#include "common/ceph_argparse.h"
#include "global/global_init.h"
#include "common/Formatter.h"
#include "common/debug.h"
#include "common/errno.h"
#include "client/Inode.h"
#include "client/Dentry.h"
#include "client/Dir.h"
#include "include/cephfs/libcephfs.h"
#define dout_context g_ceph_context
#define dout_subsys ceph_subsys_client
void usage()
{
std::cout << "Usage: ceph-client-debug [options] <inode number>" << std::endl;
generic_client_usage();
}
/**
* Given an inode, look up the path from the Client cache: assumes
* client cache is fully populated.
*/
void traverse_dentries(Inode *ino, std::vector<Dentry*> &parts)
{
if (ino->dentries.empty()) {
return;
}
Dentry* dn = *(ino->dentries.begin());
parts.push_back(dn);
traverse_dentries(dn->dir->parent_inode, parts);
}
/**
* Given an inode, send lookup requests to the MDS for
* all its ancestors, such that the full trace will be
* populated in client cache.
*/
int lookup_trace(ceph_mount_info *client, inodeno_t const ino)
{
Inode *inode;
int r = ceph_ll_lookup_inode(client, ino, &inode);
if (r != 0) {
return r;
} else {
if (!inode->dentries.empty()) {
Dentry *dn = *(inode->dentries.begin());
ceph_assert(dn->dir);
ceph_assert(dn->dir->parent_inode);
r = lookup_trace(client, dn->dir->parent_inode->ino);
if (r) {
return r;
}
} else {
// We reached the root of the tree
ceph_assert(inode->ino == CEPH_INO_ROOT);
}
}
return r;
}
int main(int argc, const char **argv)
{
// Argument handling
vector<const char*> args;
argv_to_vec(argc, argv, args);
if (args.empty()) {
cerr << argv[0] << ": -h or --help for usage" << std::endl;
exit(1);
}
if (ceph_argparse_need_usage(args)) {
usage();
exit(0);
}
auto cct = global_init(NULL, args, CEPH_ENTITY_TYPE_CLIENT,
CODE_ENVIRONMENT_UTILITY,
CINIT_FLAG_UNPRIVILEGED_DAEMON_DEFAULTS|
CINIT_FLAG_NO_DEFAULT_CONFIG_FILE);
common_init_finish(g_ceph_context);
// Expect exactly one positional argument (inode number)
if (args.size() != 1) {
cerr << "missing position argument (inode number)" << std::endl;
exit(1);
}
char const *inode_str = args[0];
inodeno_t inode = strtoll(inode_str, NULL, 0);
if (inode <= 0) {
derr << "Invalid inode: " << inode_str << dendl;
return -1;
}
// Initialize filesystem client
struct ceph_mount_info *client;
int r = ceph_create_with_context(&client, g_ceph_context);
if (r) {
derr << "Error initializing libcephfs: " << cpp_strerror(r) << dendl;
return r;
}
r = ceph_mount(client, "/");
if (r) {
derr << "Error mounting: " << cpp_strerror(r) << dendl;
ceph_shutdown(client);
return r;
}
// Populate client cache with inode of interest & ancestors
r = lookup_trace(client, inode);
if (r) {
derr << "Error looking up inode " << std::hex << inode << std::dec <<
": " << cpp_strerror(r) << dendl;
return -1;
}
// Retrieve inode of interest
struct vinodeno_t vinode;
vinode.ino = inode;
vinode.snapid = CEPH_NOSNAP;
Inode *ino = ceph_ll_get_inode(client, vinode);
// Retrieve dentry trace
std::vector<Dentry*> path;
traverse_dentries(ino, path);
// Print inode and path as a JSON object
JSONFormatter jf(true);
jf.open_object_section("client_debug");
{
jf.open_object_section("inode");
{
ino->dump(&jf);
}
jf.close_section(); // inode
jf.open_array_section("path");
{
for (std::vector<Dentry*>::reverse_iterator p = path.rbegin(); p != path.rend(); ++p) {
jf.open_object_section("dentry");
{
(*p)->dump(&jf);
}
jf.close_section(); // dentry
}
}
jf.close_section(); // path
}
jf.close_section(); // client_debug
jf.flush(std::cout);
std::cout << std::endl;
// Release Inode references
ceph_ll_forget(client, ino, 1);
for (std::vector<Dentry*>::reverse_iterator p = path.rbegin(); p != path.rend(); ++p) {
ceph_ll_forget(client, (*p)->inode.get(), 1);
}
ino = NULL;
path.clear();
// Shut down
r = ceph_unmount(client);
if (r) {
derr << "Error mounting: " << cpp_strerror(r) << dendl;
}
ceph_shutdown(client);
return r;
}
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