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/*
Copyright (c) 2016, Antonio SJ Musumeci <trapexit@spawn.link>
Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "fs_readahead.hpp"
#include "fs_wait_for_mount.hpp"
#include "syslog.hpp"
#include "fs_path.hpp"
#include "fs_umount2.hpp"
#include "mergerfs.hpp"
#include "option_parser.hpp"
#include "procfs_get_name.hpp"
#include "resources.hpp"
#include "strvec.hpp"
#include "gidcache.hpp"
#include "fuse_access.hpp"
#include "fuse_bmap.hpp"
#include "fuse_chmod.hpp"
#include "fuse_chown.hpp"
#include "fuse_copy_file_range.hpp"
#include "fuse_create.hpp"
#include "fuse_destroy.hpp"
#include "fuse_fallocate.hpp"
#include "fuse_fchmod.hpp"
#include "fuse_fchown.hpp"
#include "fuse_fgetattr.hpp"
#include "fuse_flock.hpp"
#include "fuse_flush.hpp"
#include "fuse_free_hide.hpp"
#include "fuse_fsync.hpp"
#include "fuse_fsyncdir.hpp"
#include "fuse_ftruncate.hpp"
#include "fuse_futimens.hpp"
#include "fuse_getattr.hpp"
#include "fuse_getxattr.hpp"
#include "fuse_init.hpp"
#include "fuse_ioctl.hpp"
#include "fuse_link.hpp"
#include "fuse_listxattr.hpp"
#include "fuse_lock.hpp"
#include "fuse_mkdir.hpp"
#include "fuse_mknod.hpp"
#include "fuse_open.hpp"
#include "fuse_opendir.hpp"
#include "fuse_poll.hpp"
#include "fuse_prepare_hide.hpp"
#include "fuse_read.hpp"
#include "fuse_readdir.hpp"
#include "fuse_readdir_plus.hpp"
#include "fuse_readlink.hpp"
#include "fuse_release.hpp"
#include "fuse_releasedir.hpp"
#include "fuse_removemapping.hpp"
#include "fuse_removexattr.hpp"
#include "fuse_rename.hpp"
#include "fuse_rmdir.hpp"
#include "fuse_setupmapping.hpp"
#include "fuse_setxattr.hpp"
#include "fuse_statfs.hpp"
#include "fuse_symlink.hpp"
#include "fuse_syncfs.hpp"
#include "fuse_tmpfile.hpp"
#include "fuse_truncate.hpp"
#include "fuse_unlink.hpp"
#include "fuse_utimens.hpp"
#include "fuse_write.hpp"
#include "fuse.h"
#include <csignal>
#include <cstdlib>
#include <iostream>
#include <string.h>
namespace l
{
static
void
get_fuse_operations(struct fuse_operations &ops_,
const bool nullrw_)
{
ops_.access = FUSE::access;
ops_.bmap = FUSE::bmap;
ops_.chmod = FUSE::chmod;
ops_.chown = FUSE::chown;
ops_.copy_file_range = FUSE::copy_file_range;
ops_.create = FUSE::create;
ops_.destroy = FUSE::destroy;
ops_.fallocate = FUSE::fallocate;
ops_.fchmod = FUSE::fchmod;
ops_.fchown = FUSE::fchown;
ops_.fgetattr = FUSE::fgetattr;
ops_.flock = FUSE::flock;
ops_.flush = FUSE::flush;
ops_.free_hide = FUSE::free_hide;
ops_.fsync = FUSE::fsync;
ops_.fsyncdir = FUSE::fsyncdir;
ops_.ftruncate = FUSE::ftruncate;
ops_.futimens = FUSE::futimens;
ops_.getattr = FUSE::getattr;
ops_.getxattr = FUSE::getxattr;
ops_.init = FUSE::init;
ops_.ioctl = FUSE::ioctl;
ops_.link = FUSE::link;
ops_.listxattr = FUSE::listxattr;
ops_.lock = FUSE::lock;
ops_.mkdir = FUSE::mkdir;
ops_.mknod = FUSE::mknod;
ops_.open = FUSE::open;
ops_.opendir = FUSE::opendir;
ops_.poll = FUSE::poll;;
ops_.prepare_hide = FUSE::prepare_hide;
ops_.read = (nullrw_ ? FUSE::read_null : FUSE::read);
ops_.readdir = FUSE::readdir;
ops_.readdir_plus = FUSE::readdir_plus;
ops_.readlink = FUSE::readlink;
ops_.release = FUSE::release;
ops_.releasedir = FUSE::releasedir;
ops_.removemapping = FUSE::removemapping;
ops_.removexattr = FUSE::removexattr;
ops_.rename = FUSE::rename;
ops_.rmdir = FUSE::rmdir;
ops_.setupmapping = FUSE::setupmapping;
ops_.setxattr = FUSE::setxattr;
ops_.statfs = FUSE::statfs;
ops_.symlink = FUSE::symlink;
ops_.syncfs = FUSE::syncfs;
ops_.tmpfile = FUSE::tmpfile;
ops_.truncate = FUSE::truncate;
ops_.unlink = FUSE::unlink;
ops_.utimens = FUSE::utimens;
ops_.write = (nullrw_ ? FUSE::write_null : FUSE::write);
return;
}
static
void
setup_resources(const int scheduling_priority_)
{
std::srand(time(NULL));
resources::reset_umask();
resources::maxout_rlimit_nofile();
resources::maxout_rlimit_fsize();
resources::setpriority(scheduling_priority_);
}
static
void
wait_for_mount(const Config::Read &cfg_)
{
fs::PathVector paths;
std::chrono::milliseconds timeout;
paths = cfg_->branches->to_paths();
syslog_info("Waiting %u seconds for branches to mount",
(uint64_t)cfg_->branches_mount_timeout);
timeout = std::chrono::milliseconds(cfg_->branches_mount_timeout * 1000);
fs::wait_for_mount((std::string)cfg_->mountpoint,
paths,
timeout);
}
static
void
lazy_umount(const std::string target_)
{
int rv;
rv = fs::umount_lazy(target_);
switch(rv)
{
case 0:
syslog_notice("%s has been successfully lazily unmounted",
target_.c_str());
break;
case -EINVAL:
syslog_notice("%s was not a mount point needing to be unmounted",
target_.c_str());
break;
default:
syslog_error("Error unmounting %s: %d - %s",
target_.c_str(),
-rv,
strerror(-rv));
break;
}
}
static
void
usr1_signal_handler(int signal_)
{
syslog_info("Received SIGUSR1 - invalidating all nodes");
fuse_invalidate_all_nodes();
}
static
void
usr2_signal_handler(int signal_)
{
syslog_info("Received SIGUSR2 - triggering thorough gc");
fuse_gc();
GIDCache::invalidate_all_caches();
}
static
void
setup_signal_handlers()
{
std::signal(SIGUSR1,l::usr1_signal_handler);
std::signal(SIGUSR2,l::usr2_signal_handler);
}
static
void
warn_if_not_root()
{
uid_t uid;
uid = geteuid();
if(uid == 0)
return;
char const *s = "mergerfs is not running as root and may not work correctly\n";
fprintf(stderr,"warning: %s",s);
syslog_warning(s);
}
int
main(const int argc_,
char **argv_)
{
int rv;
Config::Read cfg;
Config::ErrVec errs;
fuse_args args;
fuse_operations ops;
syslog_open();
l::warn_if_not_root();
memset(&ops,0,sizeof(fuse_operations));
args.argc = argc_;
args.argv = argv_;
args.allocated = 0;
options::parse(&args,&errs);
if(errs.size())
{
std::cerr << errs << std::endl;
return 1;
}
if(cfg->branches_mount_timeout > 0)
l::wait_for_mount(cfg);
l::setup_resources(cfg->scheduling_priority);
l::setup_signal_handlers();
l::get_fuse_operations(ops,cfg->nullrw);
if(cfg->lazy_umount_mountpoint)
l::lazy_umount(cfg->mountpoint);
procfs::init();
rv = fuse_main(args.argc,
args.argv,
&ops);
syslog_info("exiting main loop with return code %d",rv);
return rv;
}
}
int
main(int argc_,
char **argv_)
{
return l::main(argc_,argv_);
}