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 #include <optional>
  20
  21 #include "common/async/context_pool.h"
  22 #include "common/config.h"
  23 #include "common/errno.h"
  24
  25 #include "client/Client.h"
  26 #include "client/fuse_ll.h"
  27
  28 #include "msg/Messenger.h"
  29
  30 #include "mon/MonClient.h"
  31
  32 #include "common/Timer.h"
  33 #include "common/ceph_argparse.h"
  34 #if defined(__linux__)
  35 #include "common/linux_version.h"
  36 #endif
  37 #include "global/global_init.h"
  38 #include "global/signal_handler.h"
  39 #include "common/Preforker.h"
  40 #include "common/safe_io.h"
  41
  42 #include <sys/types.h>
  43 #include <fcntl.h>
  44
  45 #include "include/ceph_fuse.h"
  46 #include <fuse_lowlevel.h>
  47
  48 #define dout_context g_ceph_context
  49
  50 using namespace std;
  51
  52 ceph::async::io_context_pool icp;
  53
  54 static void fuse_usage()
  55 {
  56   const char* argv[] = {
  57     "ceph-fuse",
  58     "-h",
  59   };
  60   struct fuse_args args = FUSE_ARGS_INIT(2, (char**)argv);
  61 #if FUSE_VERSION >= FUSE_MAKE_VERSION(3, 0)
  62   struct fuse_cmdline_opts opts = {};
  63   if (fuse_parse_cmdline(&args, &opts) != -1) {
  64     if (opts.show_help) {
  65       cout << "usage: " << argv[0] << " [options] <mountpoint>\n\n";
  66       cout << "FUSE options:\n";
  67       fuse_cmdline_help();
  68       fuse_lowlevel_help();
  69       cout << "\n";
  70     }
  71   } else {
  72 #else
  73   if (fuse_parse_cmdline(&args, nullptr, nullptr, nullptr) == -1) {
  74 #endif
  75     derr << "fuse_parse_cmdline failed." << dendl;
  76   }
  77   ceph_assert(args.allocated);
  78   fuse_opt_free_args(&args);
  79 }
  80
  81 void usage()
  82 {
  83   cout <<
  84 "usage: ceph-fuse [-n client.username] [-m mon-ip-addr:mon-port] <mount point> [OPTIONS]\n"
  85 "  --client_mountpoint/-r <sub_directory>\n"
  86 "                    use sub_directory as the mounted root, rather than the full Ceph tree.\n"
  87 "\n";
  88   fuse_usage();
  89   generic_client_usage();
  90 }
  91
  92 int main(int argc, const char **argv, const char *envp[]) {
  93   int filer_flags = 0;
  94   //cerr << "ceph-fuse starting " << myrank << "/" << world << std::endl;
  95   auto args = argv_to_vec(argc, argv);
  96   if (args.empty()) {
  97     cerr << argv[0] << ": -h or --help for usage" << std::endl;
  98     exit(1);
  99   }
 100   if (ceph_argparse_need_usage(args)) {
 101     usage();
 102     exit(0);
 103   }
 104
 105   std::map<std::string,std::string> defaults = {
 106     { "pid_file", "" },
 107     { "chdir", "/" }  // FUSE will chdir("/"); be ready.
 108   };
 109
 110   auto cct = global_init(&defaults, args, CEPH_ENTITY_TYPE_CLIENT,
 111                          CODE_ENVIRONMENT_DAEMON,
 112                          CINIT_FLAG_UNPRIVILEGED_DAEMON_DEFAULTS);
 113
 114   for (auto i = args.begin(); i != args.end();) {
 115     if (ceph_argparse_double_dash(args, i)) {
 116       break;
 117     } else if (ceph_argparse_flag(args, i, "--localize-reads", (char*)nullptr)) {
 118       cerr << "setting CEPH_OSD_FLAG_LOCALIZE_READS" << std::endl;
 119       filer_flags |= CEPH_OSD_FLAG_LOCALIZE_READS;
 120     } else if (ceph_argparse_flag(args, i, "-V", (char*)nullptr)) {
 121       const char* tmpargv[] = {
 122         "ceph-fuse",
 123         "-V"
 124       };
 125
 126       struct fuse_args fargs = FUSE_ARGS_INIT(2, (char**)tmpargv);
 127 #if FUSE_VERSION >= FUSE_MAKE_VERSION(3, 0)
 128       struct fuse_cmdline_opts opts = {};
 129       if (fuse_parse_cmdline(&fargs, &opts) == -1) {
 130 #else
 131       if (fuse_parse_cmdline(&fargs, nullptr, nullptr, nullptr) == -1) {
 132 #endif
 133        derr << "fuse_parse_cmdline failed." << dendl;
 134       }
 135       ceph_assert(fargs.allocated);
 136       fuse_opt_free_args(&fargs);
 137       exit(0);
 138     } else {
 139       ++i;
 140     }
 141   }
 142
 143   // args for fuse
 144   const char **newargv;
 145   int newargc;
 146   vec_to_argv(argv[0], args, &newargc, &newargv);
 147
 148   // check for 32-bit arch
 149 #ifndef __LP64__
 150     cerr << std::endl;
 151     cerr << "WARNING: Ceph inode numbers are 64 bits wide, and FUSE on 32-bit kernels does" << std::endl;
 152     cerr << "         not cope well with that situation.  Expect to crash shortly." << std::endl;
 153     cerr << std::endl;
 154 #endif
 155
 156   Preforker forker;
 157   auto daemonize = g_conf().get_val<bool>("daemonize");
 158   if (daemonize) {
 159     global_init_prefork(g_ceph_context);
 160     int r;
 161     string err;
 162     r = forker.prefork(err);
 163     if (r < 0 || forker.is_parent()) {
 164       // Start log if current process is about to exit. Otherwise, we hit an assert
 165       // in the Ceph context destructor.
 166       g_ceph_context->_log->start();
 167     }
 168     if (r < 0) {
 169       cerr << "ceph-fuse " << err << std::endl;
 170       return r;
 171     }
 172     if (forker.is_parent()) {
 173       r = forker.parent_wait(err);
 174       if (r < 0) {
 175         cerr << "ceph-fuse " << err << std::endl;
 176       }
 177       return r;
 178     }
 179     global_init_postfork_start(cct.get());
 180   }
 181
 182   {
 183     common_init_finish(g_ceph_context);
 184
 185     init_async_signal_handler();
 186     register_async_signal_handler(SIGHUP, sighup_handler);
 187
 188     //cout << "child, mounting" << std::endl;
 189     class RemountTest : public Thread {
 190     public:
 191       CephFuse *cfuse;
 192       Client *client;
 193       RemountTest() : cfuse(nullptr), client(nullptr) {}
 194       void init(CephFuse *cf, Client *cl) {
 195         cfuse = cf;
 196         client = cl;
 197       }
 198       ~RemountTest() override {}
 199       void *entry() override {
 200 #if defined(__linux__)
 201         int ver = get_linux_version();
 202         ceph_assert(ver != 0);
 203         bool client_try_dentry_invalidate = g_conf().get_val<bool>(
 204           "client_try_dentry_invalidate");
 205         bool can_invalidate_dentries =
 206           client_try_dentry_invalidate && ver < KERNEL_VERSION(3, 18, 0);
 207         int tr = client->test_dentry_handling(can_invalidate_dentries);
 208         bool client_die_on_failed_dentry_invalidate = g_conf().get_val<bool>(
 209           "client_die_on_failed_dentry_invalidate");
 210         if (tr != 0 && client_die_on_failed_dentry_invalidate) {
 211           cerr << "ceph-fuse[" << getpid()
 212                << "]: fuse failed dentry invalidate/remount test with error "
 213                << cpp_strerror(tr) << ", stopping" << std::endl;
 214
 215           char buf[5050];
 216           string mountpoint = cfuse->get_mount_point();
 217           snprintf(buf, sizeof(buf), "fusermount -u -z %s", mountpoint.c_str());
 218           int umount_r = system(buf);
 219           if (umount_r) {
 220             if (umount_r != -1) {
 221               if (WIFEXITED(umount_r)) {
 222                 umount_r = WEXITSTATUS(umount_r);
 223                 cerr << "got error " << umount_r
 224                      << " when unmounting Ceph on failed remount test!" << std::endl;
 225               } else {
 226                 cerr << "attempt to umount on failed remount test failed (on a signal?)" << std::endl;
 227               }
 228             } else {
 229               cerr << "system() invocation failed during remount test" << std::endl;
 230             }
 231           }
 232         }
 233         return reinterpret_cast<void*>(tr);
 234 #else
 235         return reinterpret_cast<void*>(0);
 236 #endif
 237       }
 238     } tester;
 239
 240
 241     // get monmap
 242     Messenger *messenger = nullptr;
 243     StandaloneClient *client;
 244     CephFuse *cfuse;
 245     UserPerm perms;
 246     int tester_r = 0;
 247     void *tester_rp = nullptr;
 248
 249     icp.start(cct->_conf.get_val<std::uint64_t>("client_asio_thread_count"));
 250     MonClient *mc = new MonClient(g_ceph_context, icp);
 251     int r = mc->build_initial_monmap();
 252     if (r == -EINVAL) {
 253       cerr << "failed to generate initial mon list" << std::endl;
 254       exit(1);
 255     }
 256     if (r < 0)
 257       goto out_mc_start_failed;
 258
 259     // start up network
 260     messenger = Messenger::create_client_messenger(g_ceph_context, "client");
 261     messenger->set_default_policy(Messenger::Policy::lossy_client(0));
 262     messenger->set_policy(entity_name_t::TYPE_MDS,
 263                           Messenger::Policy::lossless_client(0));
 264
 265     client = new StandaloneClient(messenger, mc, icp);
 266     if (filer_flags) {
 267       client->set_filer_flags(filer_flags);
 268     }
 269
 270     cfuse = new CephFuse(client, forker.get_signal_fd());
 271
 272     r = cfuse->init(newargc, newargv);
 273     if (r != 0) {
 274       cerr << "ceph-fuse[" << getpid() << "]: fuse failed to initialize" << std::endl;
 275       goto out_messenger_start_failed;
 276     }
 277
 278     cerr << "ceph-fuse[" << getpid() << "]: starting ceph client" << std::endl;
 279     r = messenger->start();
 280     if (r < 0) {
 281       cerr << "ceph-fuse[" << getpid() << "]: ceph messenger failed with " << cpp_strerror(-r) << std::endl;
 282       goto out_messenger_start_failed;
 283     }
 284
 285     // start client
 286     r = client->init();
 287     if (r < 0) {
 288       cerr << "ceph-fuse[" << getpid() << "]: ceph client failed with " << cpp_strerror(-r) << std::endl;
 289       goto out_init_failed;
 290     }
 291
 292     client->update_metadata("mount_point", cfuse->get_mount_point());
 293     perms = client->pick_my_perms();
 294     {
 295       // start up fuse
 296       // use my argc, argv (make sure you pass a mount point!)
 297       auto client_mountpoint = g_conf().get_val<std::string>(
 298         "client_mountpoint");
 299       auto mountpoint = client_mountpoint.c_str();
 300       auto fuse_require_active_mds = g_conf().get_val<bool>(
 301         "fuse_require_active_mds");
 302       r = client->mount(mountpoint, perms, fuse_require_active_mds);
 303       if (r < 0) {
 304         if (r == CEPH_FUSE_NO_MDS_UP) {
 305           cerr << "ceph-fuse[" << getpid() << "]: probably no MDS server is up?" << std::endl;
 306         }
 307         cerr << "ceph-fuse[" << getpid() << "]: ceph mount failed with " << cpp_strerror(-r) << std::endl;
 308         r = EXIT_FAILURE;
 309         goto out_shutdown;
 310       }
 311     }
 312
 313     r = cfuse->start();
 314     if (r != 0) {
 315       cerr << "ceph-fuse[" << getpid() << "]: fuse failed to start" << std::endl;
 316       goto out_client_unmount;
 317     }
 318
 319     cerr << "ceph-fuse[" << getpid() << "]: starting fuse" << std::endl;
 320     tester.init(cfuse, client);
 321     tester.create("tester");
 322     r = cfuse->loop();
 323     tester.join(&tester_rp);
 324     tester_r = static_cast<int>(reinterpret_cast<uint64_t>(tester_rp));
 325     cerr << "ceph-fuse[" << getpid() << "]: fuse finished with error " << r
 326          << " and tester_r " << tester_r <<std::endl;
 327
 328   out_client_unmount:
 329     client->unmount();
 330     cfuse->finalize();
 331   out_shutdown:
 332     icp.stop();
 333     client->shutdown();
 334   out_init_failed:
 335     unregister_async_signal_handler(SIGHUP, sighup_handler);
 336     shutdown_async_signal_handler();
 337
 338     // wait for messenger to finish
 339     messenger->shutdown();
 340     messenger->wait();
 341   out_messenger_start_failed:
 342     delete cfuse;
 343     cfuse = nullptr;
 344     delete client;
 345     client = nullptr;
 346     delete messenger;
 347     messenger = nullptr;
 348   out_mc_start_failed:
 349     free(newargv);
 350     delete mc;
 351     mc = nullptr;
 352     //cout << "child done" << std::endl;
 353     return forker.signal_exit(r);
 354   }
 355 }