libcryfs/fuse/Fuse.cpp
2015-11-12 15:03:22 -08:00

687 lines
20 KiB
C++

#include "Fuse.h"
#include <memory>
#include <cassert>
#include "FuseErrnoException.h"
#include "Filesystem.h"
#include <iostream>
#include <messmer/cpp-utils/assert/assert.h>
#include <messmer/cpp-utils/logging/logging.h>
#include <csignal>
using std::vector;
using std::string;
namespace bf = boost::filesystem;
using namespace cpputils::logging;
using namespace fspp::fuse;
#define FUSE_OBJ ((Fuse *) fuse_get_context()->private_data)
// Remove the following line, if you don't want to output each fuse operation on the console
//#define FSPP_LOG 1
namespace {
int fusepp_getattr(const char *path, struct stat *stbuf) {
int rs = FUSE_OBJ->getattr(bf::path(path), stbuf);
return rs;
}
int fusepp_fgetattr(const char *path, struct stat *stbuf, fuse_file_info *fileinfo) {
return FUSE_OBJ->fgetattr(bf::path(path), stbuf, fileinfo);
}
int fusepp_readlink(const char *path, char *buf, size_t size) {
return FUSE_OBJ->readlink(bf::path(path), buf, size);
}
int fusepp_mknod(const char *path, mode_t mode, dev_t rdev) {
return FUSE_OBJ->mknod(bf::path(path), mode, rdev);
}
int fusepp_mkdir(const char *path, mode_t mode) {
return FUSE_OBJ->mkdir(bf::path(path), mode);
}
int fusepp_unlink(const char *path) {
return FUSE_OBJ->unlink(bf::path(path));
}
int fusepp_rmdir(const char *path) {
return FUSE_OBJ->rmdir(bf::path(path));
}
int fusepp_symlink(const char *to, const char *from) {
return FUSE_OBJ->symlink(bf::path(to), bf::path(from));
}
int fusepp_rename(const char *from, const char *to) {
return FUSE_OBJ->rename(bf::path(from), bf::path(to));
}
int fusepp_link(const char *from, const char *to) {
return FUSE_OBJ->link(bf::path(from), bf::path(to));
}
int fusepp_chmod(const char *path, mode_t mode) {
return FUSE_OBJ->chmod(bf::path(path), mode);
}
int fusepp_chown(const char *path, uid_t uid, gid_t gid) {
return FUSE_OBJ->chown(bf::path(path), uid, gid);
}
int fusepp_truncate(const char *path, off_t size) {
return FUSE_OBJ->truncate(bf::path(path), size);
}
int fusepp_ftruncate(const char *path, off_t size, fuse_file_info *fileinfo) {
return FUSE_OBJ->ftruncate(bf::path(path), size, fileinfo);
}
int fusepp_utimens(const char *path, const timespec times[2]) {
return FUSE_OBJ->utimens(bf::path(path), times);
}
int fusepp_open(const char *path, fuse_file_info *fileinfo) {
return FUSE_OBJ->open(bf::path(path), fileinfo);
}
int fusepp_release(const char *path, fuse_file_info *fileinfo) {
return FUSE_OBJ->release(bf::path(path), fileinfo);
}
int fusepp_read(const char *path, char *buf, size_t size, off_t offset, fuse_file_info *fileinfo) {
return FUSE_OBJ->read(bf::path(path), buf, size, offset, fileinfo);
}
int fusepp_write(const char *path, const char *buf, size_t size, off_t offset, fuse_file_info *fileinfo) {
return FUSE_OBJ->write(bf::path(path), buf, size, offset, fileinfo);
}
int fusepp_statfs(const char *path, struct statvfs *fsstat) {
return FUSE_OBJ->statfs(bf::path(path), fsstat);
}
int fusepp_flush(const char *path, fuse_file_info *fileinfo) {
return FUSE_OBJ->flush(bf::path(path), fileinfo);
}
int fusepp_fsync(const char *path, int datasync, fuse_file_info *fileinfo) {
return FUSE_OBJ->fsync(bf::path(path), datasync, fileinfo);
}
//int fusepp_setxattr(const char*, const char*, const char*, size_t, int)
//int fusepp_getxattr(const char*, const char*, char*, size_t)
//int fusepp_listxattr(const char*, char*, size_t)
//int fusepp_removexattr(const char*, const char*)
int fusepp_opendir(const char *path, fuse_file_info *fileinfo) {
return FUSE_OBJ->opendir(bf::path(path), fileinfo);
}
int fusepp_readdir(const char *path, void *buf, fuse_fill_dir_t filler, off_t offset, fuse_file_info *fileinfo) {
return FUSE_OBJ->readdir(bf::path(path), buf, filler, offset, fileinfo);
}
int fusepp_releasedir(const char *path, fuse_file_info *fileinfo) {
return FUSE_OBJ->releasedir(bf::path(path), fileinfo);
}
int fusepp_fsyncdir(const char *path, int datasync, fuse_file_info *fileinfo) {
return FUSE_OBJ->fsyncdir(bf::path(path), datasync, fileinfo);
}
void* fusepp_init(fuse_conn_info *conn) {
auto f = FUSE_OBJ;
f->init(conn);
return f;
}
void fusepp_destroy(void *userdata) {
auto f = FUSE_OBJ;
ASSERT(userdata == f, "Wrong userdata set");
UNUSED(userdata); //In case the assert is disabled
f->destroy();
}
int fusepp_access(const char *path, int mask) {
return FUSE_OBJ->access(bf::path(path), mask);
}
int fusepp_create(const char *path, mode_t mode, fuse_file_info *fileinfo) {
return FUSE_OBJ->create(bf::path(path), mode, fileinfo);
}
/*int fusepp_lock(const char*, fuse_file_info*, int cmd, flock*)
int fusepp_bmap(const char*, size_t blocksize, uint64_t *idx)
int fusepp_ioctl(const char*, int cmd, void *arg, fuse_file_info*, unsigned int flags, void *data)
int fusepp_poll(const char*, fuse_file_info*, fuse_pollhandle *ph, unsigned *reventsp)
int fusepp_write_buf(const char*, fuse_bufvec *buf, off_t off, fuse_file_info*)
int fusepp_read_buf(const chas*, struct fuse_bufvec **bufp, size_t size, off_T off, fuse_file_info*)
int fusepp_flock(const char*, fuse_file_info*, int op)
int fusepp_fallocate(const char*, int, off_t, off_t, fuse_file_info*)*/
fuse_operations *operations() {
static std::unique_ptr<fuse_operations> singleton(nullptr);
if (!singleton) {
singleton = std::make_unique<fuse_operations>();
singleton->getattr = &fusepp_getattr;
singleton->fgetattr = &fusepp_fgetattr;
singleton->readlink = &fusepp_readlink;
singleton->mknod = &fusepp_mknod;
singleton->mkdir = &fusepp_mkdir;
singleton->unlink = &fusepp_unlink;
singleton->rmdir = &fusepp_rmdir;
singleton->symlink = &fusepp_symlink;
singleton->rename = &fusepp_rename;
singleton->link = &fusepp_link;
singleton->chmod = &fusepp_chmod;
singleton->chown = &fusepp_chown;
singleton->truncate = &fusepp_truncate;
singleton->utimens = &fusepp_utimens;
singleton->open = &fusepp_open;
singleton->read = &fusepp_read;
singleton->write = &fusepp_write;
singleton->statfs = &fusepp_statfs;
singleton->flush = &fusepp_flush;
singleton->release = &fusepp_release;
singleton->fsync = &fusepp_fsync;
/*#ifdef HAVE_SYS_XATTR_H
singleton->setxattr = &fusepp_setxattr;
singleton->getxattr = &fusepp_getxattr;
singleton->listxattr = &fusepp_listxattr;
singleton->removexattr = &fusepp_removexattr;
#endif*/
singleton->opendir = &fusepp_opendir;
singleton->readdir = &fusepp_readdir;
singleton->releasedir = &fusepp_releasedir;
singleton->fsyncdir = &fusepp_fsyncdir;
singleton->init = &fusepp_init;
singleton->destroy = &fusepp_destroy;
singleton->access = &fusepp_access;
singleton->create = &fusepp_create;
singleton->ftruncate = &fusepp_ftruncate;
}
return singleton.get();
}
}
Fuse::~Fuse() {
}
Fuse::Fuse(Filesystem *fs)
:_fs(fs), _mountdir(), _running(false) {
}
void Fuse::run(int argc, char **argv) {
vector<char*> _argv(argv, argv + argc);
_mountdir = argv[1];
fuse_main(_argv.size(), _argv.data(), operations(), (void*)this);
}
bool Fuse::running() const {
return _running;
}
void Fuse::stop() {
//TODO Find better way to unmount (i.e. don't use external fusermount). Unmounting by kill(getpid(), SIGINT) worked, but left the mount directory transport endpoint as not connected.
int ret = system(("fusermount -z -u " + _mountdir.native()).c_str()); // "-z" takes care that if the filesystem can't be unmounted right now because something is opened, it will be unmounted as soon as it can be.
if (ret != 0) {
LOG(ERROR) << "Could not unmount filesystem";
}
}
int Fuse::getattr(const bf::path &path, struct stat *stbuf) {
#ifdef FSPP_LOG
LOG(DEBUG) << "getattr(" << path << ", _, _)";
#endif
try {
_fs->lstat(path, stbuf);
return 0;
} catch(const cpputils::AssertFailed &e) {
LOG(ERROR) << "AssertFailed in Fuse::getattr: " << e.what();
return -EIO;
} catch(fspp::fuse::FuseErrnoException &e) {
return -e.getErrno();
}
}
int Fuse::fgetattr(const bf::path &path, struct stat *stbuf, fuse_file_info *fileinfo) {
#ifdef FSPP_LOG
LOG(DEBUG) << "fgetattr(" << path << ", _, _)\n";
#endif
// On FreeBSD, trying to do anything with the mountpoint ends up
// opening it, and then using the FD for an fgetattr. So in the
// special case of a path of "/", I need to do a getattr on the
// underlying root directory instead of doing the fgetattr().
// TODO Check if necessary
if (path.native() == "/") {
return getattr(path, stbuf);
}
try {
_fs->fstat(fileinfo->fh, stbuf);
return 0;
} catch(const cpputils::AssertFailed &e) {
LOG(ERROR) << "AssertFailed in Fuse::fgetattr: " << e.what();
return -EIO;
} catch(fspp::fuse::FuseErrnoException &e) {
return -e.getErrno();
}
}
int Fuse::readlink(const bf::path &path, char *buf, size_t size) {
#ifdef FSPP_LOG
LOG(DEBUG) << "readlink(" << path << ", _, " << size << ")";
#endif
try {
_fs->readSymlink(path, buf, size);
return 0;
} catch(const cpputils::AssertFailed &e) {
LOG(ERROR) << "AssertFailed in Fuse::readlink: " << e.what();
return -EIO;
} catch (fspp::fuse::FuseErrnoException &e) {
return -e.getErrno();
}
}
int Fuse::mknod(const bf::path &path, mode_t mode, dev_t rdev) {
UNUSED(rdev);
UNUSED(mode);
UNUSED(path);
LOG(WARN) << "Called non-implemented mknod(" << path << ", " << mode << ", _)";
return ENOSYS;
}
int Fuse::mkdir(const bf::path &path, mode_t mode) {
#ifdef FSPP_LOG
LOG(DEBUG) << "mkdir(" << path << ", " << mode << ")";
#endif
try {
auto context = fuse_get_context();
_fs->mkdir(path, mode, context->uid, context->gid);
return 0;
} catch(const cpputils::AssertFailed &e) {
LOG(ERROR) << "AssertFailed in Fuse::mkdir: " << e.what();
return -EIO;
} catch(fspp::fuse::FuseErrnoException &e) {
return -e.getErrno();
}
}
int Fuse::unlink(const bf::path &path) {
#ifdef FSPP_LOG
LOG(DEBUG) << "unlink(" << path << ")";
#endif
try {
_fs->unlink(path);
return 0;
} catch(const cpputils::AssertFailed &e) {
LOG(ERROR) << "AssertFailed in Fuse::unlink: " << e.what();
return -EIO;
} catch(fspp::fuse::FuseErrnoException &e) {
return -e.getErrno();
}
}
int Fuse::rmdir(const bf::path &path) {
#ifdef FSPP_LOG
LOG(DEBUG) << "rmdir(" << path << ")";
#endif
try {
_fs->rmdir(path);
return 0;
} catch(const cpputils::AssertFailed &e) {
LOG(ERROR) << "AssertFailed in Fuse::rmdir: " << e.what();
return -EIO;
} catch(fspp::fuse::FuseErrnoException &e) {
return -e.getErrno();
}
}
int Fuse::symlink(const bf::path &from, const bf::path &to) {
#ifdef FSPP_LOG
LOG(DEBUG) << "symlink(" << from << ", " << to << ")";
#endif
try {
auto context = fuse_get_context();
_fs->createSymlink(from, to, context->uid, context->gid);
return 0;
} catch(const cpputils::AssertFailed &e) {
LOG(ERROR) << "AssertFailed in Fuse::symlink: " << e.what();
return -EIO;
} catch(fspp::fuse::FuseErrnoException &e) {
return -e.getErrno();
}
}
int Fuse::rename(const bf::path &from, const bf::path &to) {
#ifdef FSPP_LOG
LOG(DEBUG) << "rename(" << from << ", " << to << ")";
#endif
try {
_fs->rename(from, to);
return 0;
} catch(const cpputils::AssertFailed &e) {
LOG(ERROR) << "AssertFailed in Fuse::rename: " << e.what();
return -EIO;
} catch(fspp::fuse::FuseErrnoException &e) {
return -e.getErrno();
}
}
//TODO
int Fuse::link(const bf::path &from, const bf::path &to) {
LOG(WARN) << "NOT IMPLEMENTED: link(" << from << ", " << to << ")";
//auto real_from = _impl->RootDir() / from;
//auto real_to = _impl->RootDir() / to;
//int retstat = ::link(real_from.c_str(), real_to.c_str());
//return errcode_map(retstat);
return ENOSYS;
}
int Fuse::chmod(const bf::path &path, mode_t mode) {
#ifdef FSPP_LOG
LOG(DEBUG) << "chmod(" << path << ", " << mode << ")";
#endif
try {
_fs->chmod(path, mode);
return 0;
} catch(const cpputils::AssertFailed &e) {
LOG(ERROR) << "AssertFailed in Fuse::chmod: " << e.what();
return -EIO;
} catch (fspp::fuse::FuseErrnoException &e) {
return -e.getErrno();
}
}
int Fuse::chown(const bf::path &path, uid_t uid, gid_t gid) {
#ifdef FSPP_LOG
LOG(DEBUG) << "chown(" << path << ", " << uid << ", " << gid << ")";
#endif
try {
_fs->chown(path, uid, gid);
return 0;
} catch(const cpputils::AssertFailed &e) {
LOG(ERROR) << "AssertFailed in Fuse::chown: " << e.what();
return -EIO;
} catch (fspp::fuse::FuseErrnoException &e) {
return -e.getErrno();
}
}
int Fuse::truncate(const bf::path &path, off_t size) {
#ifdef FSPP_LOG
LOG(DEBUG) << "truncate(" << path << ", " << size << ")";
#endif
try {
_fs->truncate(path, size);
return 0;
} catch(const cpputils::AssertFailed &e) {
LOG(ERROR) << "AssertFailed in Fuse::truncate: " << e.what();
return -EIO;
} catch (FuseErrnoException &e) {
return -e.getErrno();
}
}
int Fuse::ftruncate(const bf::path &path, off_t size, fuse_file_info *fileinfo) {
#ifdef FSPP_LOG
LOG(DEBUG) << "ftruncate(" << path << ", " << size << ")";
#endif
UNUSED(path);
try {
_fs->ftruncate(fileinfo->fh, size);
return 0;
} catch(const cpputils::AssertFailed &e) {
LOG(ERROR) << "AssertFailed in Fuse::ftruncate: " << e.what();
return -EIO;
} catch (FuseErrnoException &e) {
return -e.getErrno();
}
}
//TODO
int Fuse::utimens(const bf::path &path, const timespec times[2]) {
#ifdef FSPP_LOG
LOG(DEBUG) << "utimens(" << path << ", _)";
#endif
try {
_fs->utimens(path, times);
return 0;
} catch(const cpputils::AssertFailed &e) {
LOG(ERROR) << "AssertFailed in Fuse::utimens: " << e.what();
return -EIO;
} catch (FuseErrnoException &e) {
return -e.getErrno();
}
}
int Fuse::open(const bf::path &path, fuse_file_info *fileinfo) {
#ifdef FSPP_LOG
LOG(DEBUG) << "open(" << path << ", _)";
#endif
try {
fileinfo->fh = _fs->openFile(path, fileinfo->flags);
return 0;
} catch(const cpputils::AssertFailed &e) {
LOG(ERROR) << "AssertFailed in Fuse::open: " << e.what();
return -EIO;
} catch (FuseErrnoException &e) {
return -e.getErrno();
}
}
int Fuse::release(const bf::path &path, fuse_file_info *fileinfo) {
#ifdef FSPP_LOG
LOG(DEBUG) << "release(" << path << ", _)";
#endif
UNUSED(path);
try {
_fs->closeFile(fileinfo->fh);
return 0;
} catch(const cpputils::AssertFailed &e) {
LOG(ERROR) << "AssertFailed in Fuse::release: " << e.what();
return -EIO;
} catch (FuseErrnoException &e) {
return -e.getErrno();
}
}
int Fuse::read(const bf::path &path, char *buf, size_t size, off_t offset, fuse_file_info *fileinfo) {
#ifdef FSPP_LOG
LOG(DEBUG) << "read(" << path << ", _, " << size << ", " << offset << ", _ )";
#endif
UNUSED(path);
try {
return _fs->read(fileinfo->fh, buf, size, offset);
} catch(const cpputils::AssertFailed &e) {
LOG(ERROR) << "AssertFailed in Fuse::read: " << e.what();
return -EIO;
} catch (FuseErrnoException &e) {
return -e.getErrno();
}
}
int Fuse::write(const bf::path &path, const char *buf, size_t size, off_t offset, fuse_file_info *fileinfo) {
#ifdef FSPP_LOG
LOG(DEBUG) << "write(" << path << ", _, " << size << ", " << offset << ", _)";
#endif
UNUSED(path);
try {
_fs->write(fileinfo->fh, buf, size, offset);
return size;
} catch(const cpputils::AssertFailed &e) {
LOG(ERROR) << "AssertFailed in Fuse::write: " << e.what();
return -EIO;
} catch (FuseErrnoException &e) {
return -e.getErrno();
}
}
//TODO
int Fuse::statfs(const bf::path &path, struct statvfs *fsstat) {
#ifdef FSPP_LOG
LOG(DEBUG) << "statfs(" << path << ", _)";
#endif
try {
_fs->statfs(path, fsstat);
return 0;
} catch(const cpputils::AssertFailed &e) {
LOG(ERROR) << "AssertFailed in Fuse::statfs: " << e.what();
return -EIO;
} catch (FuseErrnoException &e) {
return -e.getErrno();
}
}
//TODO
int Fuse::flush(const bf::path &path, fuse_file_info *fileinfo) {
#ifdef FSPP_LOG
//TODO Implement it
LOG(WARN) << "Called non-implemented flush(" << path << ", _)";
#endif
UNUSED(path);
try {
_fs->flush(fileinfo->fh);
return 0;
} catch(const cpputils::AssertFailed &e) {
LOG(ERROR) << "AssertFailed in Fuse::flush: " << e.what();
return -EIO;
} catch (FuseErrnoException &e) {
return -e.getErrno();
}
}
int Fuse::fsync(const bf::path &path, int datasync, fuse_file_info *fileinfo) {
#ifdef FSPP_LOG
LOG(DEBUG) << "fsync(" << path << ", " << datasync << ", _)";
#endif
UNUSED(path);
try {
if (datasync) {
_fs->fdatasync(fileinfo->fh);
} else {
_fs->fsync(fileinfo->fh);
}
return 0;
} catch(const cpputils::AssertFailed &e) {
LOG(ERROR) << "AssertFailed in Fuse::fsync: " << e.what();
return -EIO;
} catch (FuseErrnoException &e) {
return -e.getErrno();
}
}
int Fuse::opendir(const bf::path &path, fuse_file_info *fileinfo) {
UNUSED(path);
UNUSED(fileinfo);
//LOG(DEBUG) << "opendir(" << path << ", _)";
//We don't need opendir, because readdir works directly on the path
return 0;
}
int Fuse::readdir(const bf::path &path, void *buf, fuse_fill_dir_t filler, off_t offset, fuse_file_info *fileinfo) {
#ifdef FSPP_LOG
LOG(DEBUG) << "readdir(" << path << ", _, _, " << offset << ", _)";
#endif
UNUSED(fileinfo);
UNUSED(offset);
try {
auto entries = _fs->readDir(path);
struct stat stbuf;
for (const auto &entry : *entries) {
//We could pass more file metadata to filler() in its third parameter,
//but it doesn't help performance since fuse ignores everything in stbuf
//except for file-type bits in st_mode and (if used) st_ino.
//It does getattr() calls on all entries nevertheless.
if (entry.type == Dir::EntryType::DIR) {
stbuf.st_mode = S_IFDIR;
} else if (entry.type == Dir::EntryType::FILE) {
stbuf.st_mode = S_IFREG;
} else if (entry.type == Dir::EntryType::SYMLINK) {
stbuf.st_mode = S_IFLNK;
} else {
ASSERT(false, "Unknown entry type");
}
if (filler(buf, entry.name.c_str(), &stbuf, 0) != 0) {
return -ENOMEM;
}
}
return 0;
} catch(const cpputils::AssertFailed &e) {
LOG(ERROR) << "AssertFailed in Fuse::readdir: " << e.what();
return -EIO;
} catch (FuseErrnoException &e) {
return -e.getErrno();
}
}
int Fuse::releasedir(const bf::path &path, fuse_file_info *fileinfo) {
UNUSED(path);
UNUSED(fileinfo);
//LOG(DEBUG) << "releasedir(" << path << ", _)";
//We don't need releasedir, because readdir works directly on the path
return 0;
}
//TODO
int Fuse::fsyncdir(const bf::path &path, int datasync, fuse_file_info *fileinfo) {
UNUSED(fileinfo);
UNUSED(datasync);
UNUSED(path);
//LOG(WARN) << "Called non-implemented fsyncdir(" << path << ", " << datasync << ", _)";
return 0;
}
void Fuse::init(fuse_conn_info *conn) {
UNUSED(conn);
_running = true;
#ifdef FSPP_LOG
cpputils::logging::setLevel(DEBUG);
#endif
LOG(INFO) << "Filesystem started.";
}
void Fuse::destroy() {
_running = false;
LOG(INFO) << "Filesystem stopped.";
}
int Fuse::access(const bf::path &path, int mask) {
#ifdef FSPP_LOG
LOG(DEBUG) << "access(" << path << ", " << mask << ")";
#endif
try {
_fs->access(path, mask);
return 0;
} catch(const cpputils::AssertFailed &e) {
LOG(ERROR) << "AssertFailed in Fuse::access: " << e.what();
return -EIO;
} catch (FuseErrnoException &e) {
return -e.getErrno();
}
}
int Fuse::create(const bf::path &path, mode_t mode, fuse_file_info *fileinfo) {
#ifdef FSPP_LOG
LOG(DEBUG) << "create(" << path << ", " << mode << ", _)";
#endif
try {
auto context = fuse_get_context();
fileinfo->fh = _fs->createAndOpenFile(path, mode, context->uid, context->gid);
return 0;
} catch(const cpputils::AssertFailed &e) {
LOG(ERROR) << "AssertFailed in Fuse::create: " << e.what();
return -EIO;
} catch (FuseErrnoException &e) {
return -e.getErrno();
}
}