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Diffstat (limited to 'src/tools/ceph-client-debug.cc')
| -rw-r--r-- | src/tools/ceph-client-debug.cc | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/src/tools/ceph-client-debug.cc b/src/tools/ceph-client-debug.cc new file mode 100644 index 000000000..7a43c9c2a --- /dev/null +++ b/src/tools/ceph-client-debug.cc @@ -0,0 +1,190 @@ +// -*- 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; +} |