ceph/src/ceph_fuse.cc

   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 #include <sys/stat.h>
  16 #include <sys/utsname.h>
  17 #include <iostream>
  18 #include <string>
  19 using namespace std;
  20
  21 #include "common/config.h"
  22 #include "common/errno.h"
  23
  24 #include "client/Client.h"
  25 #include "client/fuse_ll.h"
  26
  27 #include "msg/Messenger.h"
  28
  29 #include "mon/MonClient.h"
  30
  31 #include "common/Timer.h"
  32 #include "common/ceph_argparse.h"
  33 #if defined(__linux__)
  34 #include "common/linux_version.h"
  35 #endif
  36 #include "global/global_init.h"
  37 #include "global/signal_handler.h"
  38 #include "common/Preforker.h"
  39 #include "common/safe_io.h"
  40
  41 #include <sys/types.h>
  42 #include <fcntl.h>
  43
  44 #include <fuse.h>
  45
  46 #define dout_context g_ceph_context
  47
  48 static void fuse_usage()
  49 {
  50   const char* argv[] = {
  51     "ceph-fuse",
  52     "-h",
  53   };
  54   struct fuse_args args = FUSE_ARGS_INIT(2, (char**)argv);
  55   if (fuse_parse_cmdline(&args, NULL, NULL, NULL) == -1) {
  56     derr << "fuse_parse_cmdline failed." << dendl;
  57   }
  58   assert(args.allocated);
  59   fuse_opt_free_args(&args);
  60 }
  61
  62 void usage()
  63 {
  64   cout <<
  65 "usage: ceph-fuse [-n client.username] [-m mon-ip-addr:mon-port] <mount point> [OPTIONS]\n"
  66 "  --client_mountpoint/-r <sub_directory>\n"
  67 "                    use sub_directory as the mounted root, rather than the full Ceph tree.\n"
  68 "\n";
  69   fuse_usage();
  70   generic_client_usage();
  71 }
  72
  73 int main(int argc, const char **argv, const char *envp[]) {
  74   int filer_flags = 0;
  75   //cerr << "ceph-fuse starting " << myrank << "/" << world << std::endl;
  76   std::vector<const char*> args;
  77   argv_to_vec(argc, argv, args);
  78   if (args.empty()) {
  79     usage();
  80   }
  81   env_to_vec(args);
  82
  83   std::vector<const char*> def_args{"--pid-file="};
  84
  85   auto cct = global_init(&def_args, args, CEPH_ENTITY_TYPE_CLIENT,
  86                          CODE_ENVIRONMENT_DAEMON,
  87                          CINIT_FLAG_UNPRIVILEGED_DAEMON_DEFAULTS);
  88   for (std::vector<const char*>::iterator i = args.begin(); i != args.end(); ) {
  89     if (ceph_argparse_double_dash(args, i)) {
  90       break;
  91     } else if (ceph_argparse_flag(args, i, "--localize-reads", (char*)NULL)) {
  92       cerr << "setting CEPH_OSD_FLAG_LOCALIZE_READS" << std::endl;
  93       filer_flags |= CEPH_OSD_FLAG_LOCALIZE_READS;
  94     } else if (ceph_argparse_flag(args, i, "-h", "--help", (char*)NULL)) {
  95       usage();
  96     } else {
  97       ++i;
  98     }
  99   }
 100
 101   // args for fuse
 102   const char **newargv;
 103   int newargc;
 104   vec_to_argv(argv[0], args, &newargc, &newargv);
 105
 106   // FUSE will chdir("/"); be ready.
 107   g_ceph_context->_conf->set_val("chdir", "/");
 108   g_ceph_context->_conf->apply_changes(NULL);
 109
 110   // check for 32-bit arch
 111 #ifndef __LP64__
 112     cerr << std::endl;
 113     cerr << "WARNING: Ceph inode numbers are 64 bits wide, and FUSE on 32-bit kernels does" << std::endl;
 114     cerr << "         not cope well with that situation.  Expect to crash shortly." << std::endl;
 115     cerr << std::endl;
 116 #endif
 117
 118   Preforker forker;
 119   if (g_conf->daemonize) {
 120     global_init_prefork(g_ceph_context);
 121     int r;
 122     string err;
 123     r = forker.prefork(err);
 124     if (r < 0 || forker.is_parent()) {
 125       // Start log if current process is about to exit. Otherwise, we hit an assert
 126       // in the Ceph context destructor.
 127       g_ceph_context->_log->start();
 128     }
 129     if (r < 0) {
 130       cerr << "ceph-fuse " << err << std::endl;
 131       return r;
 132     }
 133     if (forker.is_parent()) {
 134       r = forker.parent_wait(err);
 135       if (r < 0) {
 136         cerr << "ceph-fuse " << err << std::endl;
 137       }
 138       return r;
 139     }
 140     global_init_postfork_start(cct.get());
 141   }
 142
 143   {
 144     common_init_finish(g_ceph_context);
 145
 146     //cout << "child, mounting" << std::endl;
 147     class RemountTest : public Thread {
 148     public:
 149       CephFuse *cfuse;
 150       Client *client;
 151       RemountTest() : cfuse(NULL), client(NULL) {}
 152       void init(CephFuse *cf, Client *cl) {
 153         cfuse = cf;
 154         client = cl;
 155       }
 156       ~RemountTest() override {}
 157       void *entry() override {
 158 #if defined(__linux__)
 159         int ver = get_linux_version();
 160         assert(ver != 0);
 161         bool can_invalidate_dentries = g_conf->client_try_dentry_invalidate &&
 162                                        ver < KERNEL_VERSION(3, 18, 0);
 163         int tr = client->test_dentry_handling(can_invalidate_dentries);
 164         if (tr != 0) {
 165           cerr << "ceph-fuse[" << getpid()
 166                << "]: fuse failed dentry invalidate/remount test with error "
 167                << cpp_strerror(tr) << ", stopping" << std::endl;
 168
 169           char buf[5050];
 170           string mountpoint = cfuse->get_mount_point();
 171           snprintf(buf, sizeof(buf), "fusermount -u -z %s", mountpoint.c_str());
 172           int umount_r = system(buf);
 173           if (umount_r) {
 174             if (umount_r != -1) {
 175               if (WIFEXITED(umount_r)) {
 176                 umount_r = WEXITSTATUS(umount_r);
 177                 cerr << "got error " << umount_r
 178                      << " when unmounting Ceph on failed remount test!" << std::endl;
 179               } else {
 180                 cerr << "attempt to umount on failed remount test failed (on a signal?)" << std::endl;
 181               }
 182             } else {
 183               cerr << "system() invocation failed during remount test" << std::endl;
 184             }
 185           }
 186         }
 187         return reinterpret_cast<void*>(tr);
 188 #else
 189         return reinterpret_cast<void*>(0);
 190 #endif
 191       }
 192     } tester;
 193
 194
 195     // get monmap
 196     Messenger *messenger = NULL;
 197     StandaloneClient *client;
 198     CephFuse *cfuse;
 199     UserPerm perms;
 200     int tester_r = 0;
 201     void *tester_rp = NULL;
 202
 203     MonClient *mc = new MonClient(g_ceph_context);
 204     int r = mc->build_initial_monmap();
 205     if (r == -EINVAL)
 206       usage();
 207     if (r < 0)
 208       goto out_mc_start_failed;
 209
 210     // start up network
 211     messenger = Messenger::create_client_messenger(g_ceph_context, "client");
 212     messenger->set_default_policy(Messenger::Policy::lossy_client(0));
 213     messenger->set_policy(entity_name_t::TYPE_MDS,
 214                           Messenger::Policy::lossless_client(0));
 215
 216     client = new StandaloneClient(messenger, mc);
 217     if (filer_flags) {
 218       client->set_filer_flags(filer_flags);
 219     }
 220
 221     cfuse = new CephFuse(client, forker.get_signal_fd());
 222
 223     r = cfuse->init(newargc, newargv);
 224     if (r != 0) {
 225       cerr << "ceph-fuse[" << getpid() << "]: fuse failed to initialize" << std::endl;
 226       goto out_messenger_start_failed;
 227     }
 228
 229     cerr << "ceph-fuse[" << getpid() << "]: starting ceph client" << std::endl;
 230     r = messenger->start();
 231     if (r < 0) {
 232       cerr << "ceph-fuse[" << getpid() << "]: ceph messenger failed with " << cpp_strerror(-r) << std::endl;
 233       goto out_messenger_start_failed;
 234     }
 235
 236     init_async_signal_handler();
 237     register_async_signal_handler(SIGHUP, sighup_handler);
 238
 239     // start client
 240     r = client->init();
 241     if (r < 0) {
 242       cerr << "ceph-fuse[" << getpid() << "]: ceph client failed with " << cpp_strerror(-r) << std::endl;
 243       goto out_init_failed;
 244     }
 245
 246     client->update_metadata("mount_point", cfuse->get_mount_point());
 247     perms = client->pick_my_perms();
 248     // start up fuse
 249     // use my argc, argv (make sure you pass a mount point!)
 250     r = client->mount(g_conf->client_mountpoint.c_str(), perms,
 251                       g_ceph_context->_conf->fuse_require_active_mds);
 252     if (r < 0) {
 253       if (r == CEPH_FUSE_NO_MDS_UP)
 254         cerr << "ceph-fuse[" << getpid() << "]: probably no MDS server is up?" << std::endl;
 255       cerr << "ceph-fuse[" << getpid() << "]: ceph mount failed with " << cpp_strerror(-r) << std::endl;
 256       goto out_shutdown;
 257     }
 258
 259     r = cfuse->start();
 260     if (r != 0) {
 261       cerr << "ceph-fuse[" << getpid() << "]: fuse failed to start" << std::endl;
 262       goto out_client_unmount;
 263     }
 264
 265     cerr << "ceph-fuse[" << getpid() << "]: starting fuse" << std::endl;
 266     tester.init(cfuse, client);
 267     tester.create("tester");
 268     r = cfuse->loop();
 269     tester.join(&tester_rp);
 270     tester_r = static_cast<int>(reinterpret_cast<uint64_t>(tester_rp));
 271     cerr << "ceph-fuse[" << getpid() << "]: fuse finished with error " << r
 272          << " and tester_r " << tester_r <<std::endl;
 273
 274
 275   out_client_unmount:
 276     client->unmount();
 277     cfuse->finalize();
 278   out_shutdown:
 279     client->shutdown();
 280   out_init_failed:
 281     unregister_async_signal_handler(SIGHUP, sighup_handler);
 282     shutdown_async_signal_handler();
 283
 284     // wait for messenger to finish
 285     messenger->shutdown();
 286     messenger->wait();
 287   out_messenger_start_failed:
 288     delete cfuse;
 289     delete client;
 290     delete messenger;
 291   out_mc_start_failed:
 292     free(newargv);
 293     delete mc;
 294     //cout << "child done" << std::endl;
 295     return forker.signal_exit(r);
 296   }
 297 }
 298