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1 | // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- |
2 | // vim: ts=8 sw=2 smarttab | |
3 | /* | |
4 | * Ceph - scalable distributed file system | |
5 | * | |
6 | * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net> | |
7 | * | |
8 | * This is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License version 2.1, as published by the Free Software | |
11 | * Foundation. See file COPYING. | |
12 | * | |
13 | */ | |
14 | ||
15 | ||
16 | #include "common/ceph_argparse.h" | |
17 | #include "global/global_init.h" | |
18 | #include "common/Formatter.h" | |
19 | #include "common/debug.h" | |
20 | #include "common/errno.h" | |
21 | #include "client/Inode.h" | |
22 | #include "client/Dentry.h" | |
23 | #include "client/Dir.h" | |
24 | #include "include/cephfs/libcephfs.h" | |
25 | ||
26 | #define dout_context g_ceph_context | |
27 | #define dout_subsys ceph_subsys_client | |
28 | ||
20effc67 TL |
29 | using namespace std; |
30 | ||
7c673cae FG |
31 | void usage() |
32 | { | |
33 | std::cout << "Usage: ceph-client-debug [options] <inode number>" << std::endl; | |
34 | generic_client_usage(); | |
35 | } | |
36 | ||
37 | ||
38 | /** | |
39 | * Given an inode, look up the path from the Client cache: assumes | |
40 | * client cache is fully populated. | |
41 | */ | |
42 | void traverse_dentries(Inode *ino, std::vector<Dentry*> &parts) | |
43 | { | |
11fdf7f2 | 44 | if (ino->dentries.empty()) { |
7c673cae FG |
45 | return; |
46 | } | |
47 | ||
11fdf7f2 | 48 | Dentry* dn = *(ino->dentries.begin()); |
7c673cae FG |
49 | parts.push_back(dn); |
50 | traverse_dentries(dn->dir->parent_inode, parts); | |
51 | } | |
52 | ||
53 | ||
54 | /** | |
55 | * Given an inode, send lookup requests to the MDS for | |
56 | * all its ancestors, such that the full trace will be | |
57 | * populated in client cache. | |
58 | */ | |
59 | int lookup_trace(ceph_mount_info *client, inodeno_t const ino) | |
60 | { | |
61 | Inode *inode; | |
62 | int r = ceph_ll_lookup_inode(client, ino, &inode); | |
63 | if (r != 0) { | |
64 | return r; | |
65 | } else { | |
11fdf7f2 TL |
66 | if (!inode->dentries.empty()) { |
67 | Dentry *dn = *(inode->dentries.begin()); | |
68 | ceph_assert(dn->dir); | |
69 | ceph_assert(dn->dir->parent_inode); | |
7c673cae FG |
70 | r = lookup_trace(client, dn->dir->parent_inode->ino); |
71 | if (r) { | |
72 | return r; | |
73 | } | |
74 | } else { | |
75 | // We reached the root of the tree | |
11fdf7f2 | 76 | ceph_assert(inode->ino == CEPH_INO_ROOT); |
7c673cae FG |
77 | } |
78 | } | |
79 | ||
80 | return r; | |
81 | } | |
82 | ||
83 | ||
84 | int main(int argc, const char **argv) | |
85 | { | |
86 | // Argument handling | |
20effc67 | 87 | auto args = argv_to_vec(argc, argv); |
11fdf7f2 TL |
88 | if (args.empty()) { |
89 | cerr << argv[0] << ": -h or --help for usage" << std::endl; | |
90 | exit(1); | |
91 | } | |
92 | if (ceph_argparse_need_usage(args)) { | |
93 | usage(); | |
94 | exit(0); | |
95 | } | |
7c673cae FG |
96 | |
97 | auto cct = global_init(NULL, args, CEPH_ENTITY_TYPE_CLIENT, | |
98 | CODE_ENVIRONMENT_UTILITY, | |
11fdf7f2 TL |
99 | CINIT_FLAG_UNPRIVILEGED_DAEMON_DEFAULTS| |
100 | CINIT_FLAG_NO_DEFAULT_CONFIG_FILE); | |
7c673cae FG |
101 | |
102 | common_init_finish(g_ceph_context); | |
103 | ||
104 | // Expect exactly one positional argument (inode number) | |
105 | if (args.size() != 1) { | |
11fdf7f2 TL |
106 | cerr << "missing position argument (inode number)" << std::endl; |
107 | exit(1); | |
7c673cae FG |
108 | } |
109 | char const *inode_str = args[0]; | |
110 | inodeno_t inode = strtoll(inode_str, NULL, 0); | |
111 | if (inode <= 0) { | |
112 | derr << "Invalid inode: " << inode_str << dendl; | |
113 | return -1; | |
114 | } | |
115 | ||
116 | // Initialize filesystem client | |
117 | struct ceph_mount_info *client; | |
118 | int r = ceph_create_with_context(&client, g_ceph_context); | |
119 | if (r) { | |
120 | derr << "Error initializing libcephfs: " << cpp_strerror(r) << dendl; | |
121 | return r; | |
122 | } | |
123 | ||
124 | r = ceph_mount(client, "/"); | |
125 | if (r) { | |
126 | derr << "Error mounting: " << cpp_strerror(r) << dendl; | |
127 | ceph_shutdown(client); | |
128 | return r; | |
129 | } | |
130 | ||
131 | ||
132 | // Populate client cache with inode of interest & ancestors | |
133 | r = lookup_trace(client, inode); | |
134 | if (r) { | |
135 | derr << "Error looking up inode " << std::hex << inode << std::dec << | |
136 | ": " << cpp_strerror(r) << dendl; | |
137 | return -1; | |
138 | } | |
139 | ||
140 | // Retrieve inode of interest | |
141 | struct vinodeno_t vinode; | |
142 | vinode.ino = inode; | |
143 | vinode.snapid = CEPH_NOSNAP; | |
144 | Inode *ino = ceph_ll_get_inode(client, vinode); | |
145 | ||
146 | // Retrieve dentry trace | |
147 | std::vector<Dentry*> path; | |
148 | traverse_dentries(ino, path); | |
149 | ||
150 | // Print inode and path as a JSON object | |
151 | JSONFormatter jf(true); | |
152 | jf.open_object_section("client_debug"); | |
153 | { | |
154 | jf.open_object_section("inode"); | |
155 | { | |
156 | ino->dump(&jf); | |
157 | } | |
158 | jf.close_section(); // inode | |
159 | jf.open_array_section("path"); | |
160 | { | |
161 | for (std::vector<Dentry*>::reverse_iterator p = path.rbegin(); p != path.rend(); ++p) { | |
162 | jf.open_object_section("dentry"); | |
163 | { | |
164 | (*p)->dump(&jf); | |
165 | } | |
166 | jf.close_section(); // dentry | |
167 | } | |
168 | } | |
169 | jf.close_section(); // path | |
170 | } | |
171 | jf.close_section(); // client_debug | |
172 | jf.flush(std::cout); | |
173 | std::cout << std::endl; | |
174 | ||
175 | // Release Inode references | |
176 | ceph_ll_forget(client, ino, 1); | |
177 | for (std::vector<Dentry*>::reverse_iterator p = path.rbegin(); p != path.rend(); ++p) { | |
178 | ceph_ll_forget(client, (*p)->inode.get(), 1); | |
179 | } | |
180 | ino = NULL; | |
181 | path.clear(); | |
182 | ||
183 | // Shut down | |
184 | r = ceph_unmount(client); | |
185 | if (r) { | |
186 | derr << "Error mounting: " << cpp_strerror(r) << dendl; | |
187 | } | |
188 | ceph_shutdown(client); | |
189 | ||
190 | return r; | |
191 | } |