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fuseuring_main.cpp
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// SPDX-License-Identifier: LGPL-3.0-or-later
// Copyright (C) Martin Raiber
#include <sys/mount.h>
#include "fuse_kernel.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <liburing.h>
#include <stack>
#include <malloc.h>
#include <assert.h>
#include <memory.h>
#include <thread>
#include <iostream>
#include "fuse_io_context.h"
#include "fuseuring_main.h"
namespace
{
const size_t fuse_max_pages = 256;
const size_t header_buf_size = std::max(sizeof(fuse_in_header) + sizeof(fuse_write_in),
sizeof(fuse_out_header) + sizeof(fuse_write_out));
const size_t scratch_buf_size = std::max(std::max(std::max(
static_cast<size_t>(4096),
sizeof(fuse_out_header)+sizeof(fuse_attr_out)),
sizeof(fuse_out_header)+sizeof(fuse_entry_out)),
sizeof(fuse_out_header)+sizeof(fuse_write_out));
template<typename T>
auto round_up(T numToRound, T multiple)
{
return ((numToRound + multiple - 1) / multiple) * multiple;
}
}
[[nodiscard]] fuse_io_context::io_uring_task<char*> read_rbytes(fuse_io_context& io, fuse_io_context::FuseIoVal& fuse_io,
size_t rbytes, bool add_zero, size_t init_read, std::vector<char>& free_buf)
{
if(rbytes==0)
{
co_return fuse_io->scratch_buf;
}
bool io_read=true;
if(init_read==rbytes)
{
if(add_zero)
io_read=false;
else
co_return fuse_io->header_buf + sizeof(fuse_in_header);
}
bool read_fixed=false;
if(rbytes + (add_zero ? 1 : 0) < scratch_buf_size)
{
if(init_read>0)
memcpy(fuse_io->scratch_buf, fuse_io->header_buf + sizeof(fuse_in_header), init_read);
read_fixed=true;
}
else
{
free_buf.resize(rbytes + (add_zero ? 1 : 0));
if(init_read>0)
memcpy(free_buf.data(), fuse_io->header_buf + sizeof(fuse_in_header), init_read);
}
if(io_read)
{
size_t read_done = init_read;
do
{
io_uring_sqe *sqe = io.get_sqe();
if(sqe==nullptr)
co_return nullptr;
DBG_PRINT(std::cout << "Read rbytes "<< rbytes << " init read " << init_read << std::endl);
if(read_fixed)
{
io_uring_prep_read_fixed(sqe, fuse_io->pipe[0], fuse_io->scratch_buf + read_done,
rbytes - read_done, 0, fuse_io->scratch_buf_idx);
}
else
{
io_uring_prep_read(sqe, fuse_io->pipe[0], &free_buf[read_done],
rbytes-read_done, 0);
}
sqe->flags |= IOSQE_FIXED_FILE;
int rc = co_await io.complete(sqe);
if(rc<=0)
{
std::cerr << "Reading rbytes failed rc=" << rc << std::endl;
co_return nullptr;
}
read_done+=rc;
} while(read_done<rbytes);
}
if(read_fixed)
{
if(add_zero)
fuse_io->scratch_buf[rbytes] = 0;
co_return fuse_io->scratch_buf;
}
else
{
if(add_zero)
free_buf[rbytes]=0;
co_return &free_buf[0];
}
}
[[nodiscard]] fuse_io_context::io_uring_task<int> send_reply(fuse_io_context& io, fuse_io_context::FuseIoVal& fuse_io)
{
struct io_uring_sqe *sqe;
sqe = io.get_sqe(2);
if(sqe==nullptr)
co_return -1;
size_t reply_size = reinterpret_cast<const fuse_out_header*>(fuse_io->scratch_buf)->len;
io_uring_prep_write_fixed(sqe, fuse_io->pipe[1],
fuse_io->scratch_buf, reply_size,
0, fuse_io->scratch_buf_idx);
sqe->flags |= IOSQE_FIXED_FILE | IOSQE_IO_LINK;
io_uring_sqe *sqe2 = io.get_sqe();
io_uring_prep_splice(sqe2, fuse_io->pipe[0],
-1, fuse_io->fuse_fd, -1, reply_size,
SPLICE_F_MOVE| SPLICE_F_FD_IN_FIXED | SPLICE_F_NONBLOCK);
sqe2->flags |= IOSQE_FIXED_FILE;
auto [rc1, rc2] = co_await io.complete(std::make_pair(sqe, sqe2));
if(rc1!=reply_size || rc2!=reply_size)
{
std::cerr << "# Send reply failed rc1="<< rc1 << " rc2=" << rc2 << std::endl;
co_return -1;
}
else
{
co_return 0;
}
}
[[nodiscard]] fuse_io_context::io_uring_task<int> send_reply(fuse_io_context& io, fuse_io_context::FuseIoVal& fuse_io,
const std::vector<char>& buf)
{
struct io_uring_sqe *sqe;
sqe = io.get_sqe(2);
if(sqe==nullptr)
co_return -1;
DBG_PRINT(std::cout << "send unique buf: " << reinterpret_cast<const fuse_out_header*>(buf.data())->unique << std::endl);
io_uring_prep_write(sqe, fuse_io->pipe[1],
buf.data(), buf.size(),
0);
sqe->flags |= IOSQE_FIXED_FILE | IOSQE_IO_LINK;
io_uring_sqe *sqe2 = io.get_sqe();
if(sqe2==nullptr)
co_return -1;
io_uring_prep_splice(sqe2, fuse_io->pipe[0],
-1, fuse_io->fuse_fd, -1, buf.size(),
SPLICE_F_MOVE| SPLICE_F_FD_IN_FIXED | SPLICE_F_NONBLOCK);
sqe2->flags |= IOSQE_FIXED_FILE;
auto [rc1, rc2] = co_await io.complete(std::make_pair(sqe, sqe2));
if(rc1!=buf.size() || rc2!=buf.size())
{
std::cerr << "# Send reply buf failed rc1="<< rc1 << " rc2=" << rc2 << std::endl;
co_return -1;
}
else
{
co_return 0;
}
}
[[nodiscard]] fuse_io_context::io_uring_task<int> handle_unknown(fuse_io_context& io, fuse_io_context::FuseIoVal& fuse_io)
{
fuse_in_header* fheader = reinterpret_cast<fuse_in_header*>(fuse_io->header_buf);
fuse_out_header* out_header = reinterpret_cast<fuse_out_header*>(fuse_io->scratch_buf);
out_header->error = -ENOSYS;
out_header->len = sizeof(fuse_out_header);
out_header->unique = fheader->unique;
co_return co_await send_reply(io, fuse_io);
}
[[nodiscard]] fuse_io_context::io_uring_task<int> send_attr(fuse_io_context& io, fuse_io_context::FuseIoVal& fuse_io,
uint64_t unique, uint64_t nodeid)
{
fuse_out_header* out_header = reinterpret_cast<fuse_out_header*>(fuse_io->scratch_buf);
out_header->error = 0;
out_header->len = sizeof(fuse_attr_out) + sizeof(fuse_out_header);
out_header->unique = unique;
fuse_attr_out* attr_out = reinterpret_cast<fuse_attr_out*>(fuse_io->scratch_buf + sizeof(fuse_out_header));
attr_out->attr_valid = 3600;
attr_out->attr_valid_nsec = 0;
memset(&attr_out->attr, 0, sizeof(attr_out->attr));
DBG_PRINT(std::cout << "send_attr nodeid " << nodeid << std::endl);
if(nodeid==1)
{
attr_out->attr.mode = S_IFDIR | S_IRWXU | S_IRWXG | S_IRWXO;
attr_out->attr.ino = 1;
}
else if(nodeid==3)
{
attr_out->attr.mode = S_IFREG | S_IRWXU | S_IRWXG | S_IRWXO;
attr_out->attr.ino = 3;
attr_out->attr.size = io.fuse_ring.backing_f_size;
attr_out->attr.blocks = round_up<off_t>(attr_out->attr.size, 512);
attr_out->attr.blksize = getpagesize();
}
else
{
out_header->error = -EACCES;
out_header->len = sizeof(fuse_out_header);
}
co_return co_await send_reply(io, fuse_io);
}
[[nodiscard]] fuse_io_context::io_uring_task<int> handle_getattr(fuse_io_context& io, fuse_io_context::FuseIoVal& fuse_io,
char* rbytes_buf)
{
fuse_in_header* fheader = reinterpret_cast<fuse_in_header*>(fuse_io->header_buf);
uint64_t nodeid = fheader->nodeid;
fuse_getattr_in* getattr_in = reinterpret_cast<fuse_getattr_in*>(rbytes_buf);
bool getattr_fh = (getattr_in->getattr_flags & FUSE_GETATTR_FH)>0;
if(getattr_fh)
{
DBG_PRINT(std::cout << "fattr fh" << std::endl);
nodeid = getattr_in->fh;
}
co_return co_await send_attr(io, fuse_io, fheader->unique, nodeid);
}
[[nodiscard]] fuse_io_context::io_uring_task<int> handle_setattr(fuse_io_context& io, fuse_io_context::FuseIoVal& fuse_io,
char* rbytes_buf)
{
fuse_in_header* fheader = reinterpret_cast<fuse_in_header*>(fuse_io->header_buf);
uint64_t nodeid = fheader->nodeid;
fuse_setattr_in* setattr_in = reinterpret_cast<fuse_setattr_in*>(rbytes_buf);
if(setattr_in->fh)
{
DBG_PRINT(std::cout << "fattr fh" << std::endl);
nodeid = setattr_in->fh;
}
if(nodeid==3)
{
DBG_PRINT(std::cout << "Set attr new size " << setattr_in->size << " denied" << std::endl);
}
co_return co_await send_attr(io, fuse_io, fheader->unique, nodeid);
}
[[nodiscard]] fuse_io_context::io_uring_task<int> handle_lookup(fuse_io_context& io, fuse_io_context::FuseIoVal& fuse_io,
char* rbytes_buf)
{
fuse_in_header* fheader = reinterpret_cast<fuse_in_header*>(fuse_io->header_buf);
DBG_PRINT(std::cout << "fuse lookup " << rbytes_buf << std::endl);
std::string lname = rbytes_buf;
fuse_out_header* out_header = reinterpret_cast<fuse_out_header*>(fuse_io->scratch_buf);
out_header->error = 0;
out_header->len = sizeof(fuse_entry_out) + sizeof(fuse_out_header);
out_header->unique = fheader->unique;
fuse_entry_out* entry_out = reinterpret_cast<fuse_entry_out*>(fuse_io->scratch_buf + sizeof(fuse_out_header));
entry_out->generation = 0;
entry_out->entry_valid = 3600;
entry_out->entry_valid_nsec = 0;
entry_out->attr_valid = 3600;
entry_out->attr_valid_nsec = 0;
if(lname=="volume")
{
DBG_PRINT(std::cout << "Looking up volume" << std::endl);
entry_out->nodeid = 3;
entry_out->attr = {};
entry_out->attr.mode = S_IFREG | S_IRWXU | S_IRWXG | S_IRWXO;
entry_out->attr.ino = 3;
entry_out->attr.size = io.fuse_ring.backing_f_size;
entry_out->attr.blocks = round_up<off_t>(entry_out->attr.size, 512);
entry_out->attr.blksize = getpagesize();
}
else
{
entry_out->nodeid = 1;
entry_out->attr = {};
entry_out->attr.mode = S_IFDIR | S_IRWXU | S_IRWXG | S_IRWXO;
entry_out->attr.ino = 1;
}
co_return co_await send_reply(io, fuse_io);
}
[[nodiscard]] fuse_io_context::io_uring_task<int> handle_opendir(fuse_io_context& io, fuse_io_context::FuseIoVal& fuse_io,
char* rbytes_buf)
{
fuse_in_header* fheader = reinterpret_cast<fuse_in_header*>(fuse_io->header_buf);
fuse_open_in* open_in = reinterpret_cast<fuse_open_in*>(rbytes_buf);
DBG_PRINT(std::cout << "opendir nodeid " << fheader->nodeid << std::endl);
fuse_out_header* out_header = reinterpret_cast<fuse_out_header*>(fuse_io->scratch_buf);
out_header->error = 0;
out_header->len = sizeof(fuse_open_out) + sizeof(fuse_out_header);
out_header->unique = fheader->unique;
fuse_open_out* open_out = reinterpret_cast<fuse_open_out*>(fuse_io->scratch_buf + sizeof(fuse_out_header));
open_out->fh = 1;
open_out->open_flags = open_in->flags | FOPEN_CACHE_DIR;
co_return co_await send_reply(io, fuse_io);
}
[[nodiscard]] fuse_io_context::io_uring_task<int> handle_open(fuse_io_context& io, fuse_io_context::FuseIoVal& fuse_io,
char* rbytes_buf)
{
fuse_in_header* fheader = reinterpret_cast<fuse_in_header*>(fuse_io->header_buf);
fuse_open_in* open_in = reinterpret_cast<fuse_open_in*>(rbytes_buf);
DBG_PRINT(std::cout << "open nodeid " << fheader->nodeid << std::endl);
fuse_out_header* out_header = reinterpret_cast<fuse_out_header*>(fuse_io->scratch_buf);
out_header->error = 0;
out_header->len = sizeof(fuse_open_out) + sizeof(fuse_out_header);
out_header->unique = fheader->unique;
fuse_open_out* open_out = reinterpret_cast<fuse_open_out*>(fuse_io->scratch_buf + sizeof(fuse_out_header));
open_out->fh = 3;
open_out->open_flags = open_in->flags | FOPEN_KEEP_CACHE | FOPEN_DIRECT_IO;
co_return co_await send_reply(io, fuse_io);
}
[[nodiscard]] fuse_io_context::io_uring_task<int> handle_read(fuse_io_context& io, fuse_io_context::FuseIoVal& fuse_io,
char* rbytes_buf)
{
fuse_in_header* fheader = reinterpret_cast<fuse_in_header*>(fuse_io->header_buf);
uint64_t read_offset;
uint32_t read_size;
{
fuse_read_in* read_in = reinterpret_cast<fuse_read_in*>(rbytes_buf);
DBG_PRINT(std::cout << "read nodeid " << fheader->nodeid << " off: " << read_in->offset << " size: "<<read_in->size << std::endl);
if(fheader->nodeid!=3)
{
fuse_out_header* out_header = reinterpret_cast<fuse_out_header*>(fuse_io->scratch_buf);
out_header->error = 0;
out_header->unique = fheader->unique;
out_header->error = -ENOENT;
co_return co_await send_reply(io, fuse_io);
}
if(read_in->offset + read_in->size > io.fuse_ring.backing_f_size)
{
read_in->size = io.fuse_ring.backing_f_size - read_in->offset;
DBG_PRINT(std::cout << "Reading less: " << read_in->size << std::endl);
}
read_offset = read_in->offset;
read_size = read_in->size;
}
fuse_out_header* out_header = reinterpret_cast<fuse_out_header*>(fuse_io->scratch_buf);
out_header->error = 0;
out_header->len = sizeof(fuse_out_header) + read_size;
out_header->unique = fheader->unique;
io_uring_sqe* sqe1 = io.get_sqe(3);
if(sqe1==nullptr)
co_return -1;
io_uring_prep_write_fixed(sqe1, fuse_io->pipe[1],
fuse_io->scratch_buf, sizeof(fuse_out_header),
-1, fuse_io->scratch_buf_idx);
sqe1->flags |= IOSQE_FIXED_FILE | IOSQE_IO_LINK;
io_uring_sqe *sqe2 = io.get_sqe();
if(sqe2==nullptr)
co_return -1;
io_uring_prep_splice(sqe2, io.fuse_ring.backing_fd,
read_offset, fuse_io->pipe[1], -1, read_size,
SPLICE_F_MOVE| SPLICE_F_FD_IN_FIXED | SPLICE_F_NONBLOCK);
sqe2->flags |= IOSQE_FIXED_FILE | IOSQE_IO_LINK;
io_uring_sqe *sqe3 = io.get_sqe();
if(sqe3==nullptr)
co_return -1;
io_uring_prep_splice(sqe3, fuse_io->pipe[0],
-1, fuse_io->fuse_fd, -1, out_header->len,
SPLICE_F_MOVE | SPLICE_F_FD_IN_FIXED | SPLICE_F_NONBLOCK);
sqe3->flags |= IOSQE_FIXED_FILE;
std::vector<int> rcs = co_await io.complete({sqe1, sqe2, sqe3});
for(int rc: rcs)
{
if(rc<0)
{
std::cerr << "handle_read failed. rcs=" <<
rcs[0] << ", " << rcs[1] << ", " <<
rcs[2] << std::endl;
co_return -1;
}
}
if(rcs[0]<sizeof(fuse_out_header))
{
co_return -1;
}
if(rcs[1]<read_size)
{
co_return -1;
}
if(rcs[2]<out_header->len)
{
co_return -1;
}
co_return 0;
}
[[nodiscard]] fuse_io_context::io_uring_task<int> handle_write(fuse_io_context& io, fuse_io_context::FuseIoVal& fuse_io,
char* rbytes_buf)
{
fuse_in_header* fheader = reinterpret_cast<fuse_in_header*>(fuse_io->header_buf);
uint64_t write_offset;
uint32_t write_size;
{
fuse_write_in* write_in = reinterpret_cast<fuse_write_in*>(rbytes_buf);
DBG_PRINT(std::cout << "write nodeid " << fheader->nodeid << " off: " << write_in->offset << " size: "<< write_in->size << std::endl);
if(fheader->nodeid!=3)
{
fuse_out_header* out_header = reinterpret_cast<fuse_out_header*>(fuse_io->scratch_buf);
out_header->unique = fheader->unique;
out_header->error = -ENOENT;
out_header->len = sizeof(fuse_out_header);
co_return co_await send_reply(io, fuse_io);
}
write_offset = write_in->offset;
write_size = write_in->size;
/*if(write_offset + write_size > io.fuse_ring.backing_f_size)
{
write_size = io.fuse_ring.backing_f_size - write_offset;
std::cout << "Writing less: " << write_size << std::endl;
}*/
if(fheader->len!=sizeof(fuse_in_header)+sizeof(fuse_write_in)+write_size)
{
fuse_out_header* out_header = reinterpret_cast<fuse_out_header*>(fuse_io->scratch_buf);
out_header->unique = fheader->unique;
out_header->error = -EINVAL;
out_header->len = sizeof(fuse_out_header);
co_return co_await send_reply(io, fuse_io);
}
}
/*if(write_size<=4096)
{
io_uring_sqe* sqe1 = co_await io.get_sqe();
io_uring_prep_read_fixed(sqe1, fuse_io->pipe[0], fuse_io->scratch_buf,
write_size, 0, fuse_io->scratch_buf_idx);
sqe1->flags |= IOSQE_FIXED_FILE | IOSQE_IO_LINK;
io_uring_sqe* sqe2 = co_await io.get_sqe();
io_uring_prep_write(sqe2, io.fuse_ring.backing_fd, fuse_io->scratch_buf,
write_size, write_offset);
sqe2->flags |= IOSQE_FIXED_FILE | IOSQE_IO_LINK;
uint64_t header_unique = fheader->unique;
fuse_out_header* out_header = reinterpret_cast<fuse_out_header*>(fuse_io->header_buf);
out_header->error = 0;
out_header->len = sizeof(fuse_out_header) + sizeof(fuse_write_out);
out_header->unique = header_unique;
fuse_write_out* write_out = reinterpret_cast<fuse_write_out*>(fuse_io->header_buf + sizeof(fuse_out_header));
write_out->size = write_size;
write_out->padding = 0;
io_uring_sqe* sqe3 = co_await io.get_sqe();
io_uring_prep_write(sqe3, fuse_io->pipe[1],
fuse_io->header_buf, out_header->len,
0);
sqe3->flags |= IOSQE_FIXED_FILE | IOSQE_IO_LINK;
io_uring_sqe* sqe4 = co_await io.get_sqe();
io_uring_prep_splice(sqe4, fuse_io->pipe[0],
-1, io.fuse_ring.fd, -1, out_header->len,
SPLICE_F_MOVE| SPLICE_F_FD_IN_FIXED | SPLICE_F_NONBLOCK);
sqe4->flags |= IOSQE_FIXED_FILE;
std::vector<int> rcs = co_await io.complete({sqe1, sqe2, sqe3, sqe4});
for(int rc: rcs)
{
if(rc<0)
co_return -1;
}
co_return 0;
}
std::cout << "Splice ... write size " << write_size << std::endl;*/
fuse_out_header* out_header = reinterpret_cast<fuse_out_header*>(fuse_io->scratch_buf);
out_header->error = 0;
out_header->len = sizeof(fuse_out_header) + sizeof(fuse_write_out);
out_header->unique = fheader->unique;
fuse_write_out* write_out = reinterpret_cast<fuse_write_out*>(fuse_io->scratch_buf + sizeof(fuse_out_header));
write_out->size = write_size;
write_out->padding = 0;
io_uring_sqe* sqe1 = io.get_sqe(3);
if(sqe1==nullptr)
co_return -1;
io_uring_prep_splice(sqe1, fuse_io->pipe[0],
-1, io.fuse_ring.backing_fd, write_offset, write_size,
SPLICE_F_MOVE| SPLICE_F_FD_IN_FIXED | SPLICE_F_NONBLOCK);
sqe1->flags |= IOSQE_FIXED_FILE | IOSQE_IO_LINK;
io_uring_sqe* sqe2 = io.get_sqe();
if(sqe2==nullptr)
co_return -1;
io_uring_prep_write_fixed(sqe2, fuse_io->pipe[1],
fuse_io->scratch_buf, out_header->len,
0, fuse_io->scratch_buf_idx);
sqe2->flags |= IOSQE_FIXED_FILE | IOSQE_IO_LINK;
io_uring_sqe *sqe3 = io.get_sqe();
if(sqe3==nullptr)
co_return -1;
io_uring_prep_splice(sqe3, fuse_io->pipe[0],
-1, fuse_io->fuse_fd, -1, out_header->len,
SPLICE_F_MOVE| SPLICE_F_FD_IN_FIXED | SPLICE_F_NONBLOCK);
sqe3->flags |= IOSQE_FIXED_FILE;
std::vector<int> rcs = co_await io.complete({sqe1, sqe2, sqe3});
if(rcs[0]<0)
{
out_header->error = rcs[0];
out_header->len = sizeof(fuse_out_header);
co_return co_await send_reply(io, fuse_io);
}
if(rcs[0]<write_size)
{
write_out->size = rcs[0];
co_return co_await send_reply(io, fuse_io);
}
if(rcs[1]<0 || rcs[2]<0 ||
rcs[1]!=out_header->len || rcs[2]!=out_header->len)
{
std::cerr << "handle_write failed rcs=" <<
rcs[0] << ", " << rcs[1] << ", " <<
rcs[2] << std::endl;
co_return -1;
}
DBG_PRINT(std::cout << "FUSE_WRITE done" << std::endl);
co_return 0;
}
[[nodiscard]] fuse_io_context::io_uring_task<int> handle_releasedir(fuse_io_context& io, fuse_io_context::FuseIoVal& fuse_io,
char* rbytes_buf)
{
fuse_in_header* fheader = reinterpret_cast<fuse_in_header*>(fuse_io->header_buf);
fuse_release_in* release_in = reinterpret_cast<fuse_release_in*>(rbytes_buf);
DBG_PRINT(std::cout << "releasedir nodeid " << fheader->nodeid << std::endl);
fuse_out_header* out_header = reinterpret_cast<fuse_out_header*>(fuse_io->scratch_buf);
out_header->error = 0;
out_header->len = sizeof(fuse_out_header);
out_header->unique = fheader->unique;
co_return co_await send_reply(io, fuse_io);
}
[[nodiscard]] fuse_io_context::io_uring_task<int> handle_release(fuse_io_context& io, fuse_io_context::FuseIoVal& fuse_io,
char* rbytes_buf)
{
fuse_in_header* fheader = reinterpret_cast<fuse_in_header*>(fuse_io->header_buf);
fuse_release_in* release_in = reinterpret_cast<fuse_release_in*>(rbytes_buf);
DBG_PRINT(std::cout << "release nodeid " << fheader->nodeid << std::endl);
fuse_out_header* out_header = reinterpret_cast<fuse_out_header*>(fuse_io->scratch_buf);
out_header->error = 0;
out_header->len = sizeof(fuse_out_header);
out_header->unique = fheader->unique;
co_return co_await send_reply(io, fuse_io);
}
void add_dir(std::vector<char>& buf, const std::string& name, size_t off, const struct stat& stbuf)
{
size_t bsize = FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + name.size());
size_t orig_off = buf.size();
buf.resize(buf.size()+bsize);
fuse_dirent* dirent = reinterpret_cast<fuse_dirent*>(&buf[orig_off]);
dirent->ino = stbuf.st_ino;
dirent->namelen = name.size();
dirent->off = off;
dirent->type = (stbuf.st_mode & S_IFMT) >> 12;
memcpy(dirent->name, name.data(), name.size());
memset(dirent->name + name.size(), 0, bsize-FUSE_NAME_OFFSET-name.size());
}
[[nodiscard]] fuse_io_context::io_uring_task<int> handle_readdir(fuse_io_context& io, fuse_io_context::FuseIoVal& fuse_io,
char* rbytes_buf)
{
fuse_in_header* fheader = reinterpret_cast<fuse_in_header*>(fuse_io->header_buf);
fuse_read_in* read_in = reinterpret_cast<fuse_read_in*>(rbytes_buf);
DBG_PRINT(std::cout << "readdir nodeid " << fheader->nodeid << " offset: " << read_in->offset << " read_flags: "
<< read_in->read_flags << " size: " << read_in->size << std::endl);
std::vector<char> out_buf(sizeof(fuse_out_header));
fuse_out_header* out_header = reinterpret_cast<fuse_out_header*>(out_buf.data());
out_header->error = 0;
out_header->unique = fheader->unique;
if(read_in->offset==0)
{
struct stat stbuf = {};
stbuf.st_mode = S_IFDIR | S_IRWXU | S_IRWXG | S_IRWXO;
stbuf.st_ino = 2;
add_dir(out_buf, ".", 1, stbuf);
stbuf.st_ino = 3;
add_dir(out_buf, "..", 2, stbuf);
stbuf.st_ino = 4;
stbuf.st_size = io.fuse_ring.backing_f_size;
stbuf.st_blocks = round_up<off_t>(stbuf.st_size, 512);
add_dir(out_buf, "volume", 3, stbuf);
}
out_header = reinterpret_cast<fuse_out_header*>(out_buf.data());
out_header->len = out_buf.size();
co_return co_await send_reply(io, fuse_io, out_buf);
}
fuse_io_context::io_uring_task<int> queue_fuse_read(fuse_io_context& io)
{
fuse_io_context::FuseIoVal fuse_io = io.get_fuse_io();
DBG_PRINT(std::cout << "queue_fuse_read" << std::endl);
struct io_uring_sqe *sqe1 = io.get_sqe(2);
struct io_uring_sqe *sqe2 = io.get_sqe();
if(sqe1==nullptr || sqe2==nullptr)
co_return -1;
io_uring_prep_splice(sqe1, fuse_io->fuse_fd, -1, fuse_io->pipe[1],
-1, io.fuse_ring.max_bufsize, SPLICE_F_MOVE|SPLICE_F_NONBLOCK|SPLICE_F_FD_IN_FIXED);
sqe1->flags |= IOSQE_IO_HARDLINK | IOSQE_FIXED_FILE;
io_uring_prep_read_fixed(sqe2, fuse_io->pipe[0], fuse_io->header_buf,
sizeof(fuse_in_header) + sizeof(fuse_write_in), 0, fuse_io->header_buf_idx);
sqe2->flags |= IOSQE_FIXED_FILE;
auto [rbytes, init_read] = co_await io.complete(std::make_pair(sqe1, sqe2));
if(rbytes<0 || rbytes<sizeof(fuse_in_header))
{
static bool erronce=true;
if(erronce)
{
std::cerr << "Error reading from fuse rc=" << rbytes << std::endl;
erronce=false;
}
co_return -1;
}
if(init_read>0 && init_read<sizeof(fuse_in_header))
{
do
{
io_uring_sqe *sqe = io.get_sqe();
io_uring_prep_read_fixed(sqe, fuse_io->pipe[0], fuse_io->header_buf + init_read,
sizeof(fuse_in_header)-init_read, 0, fuse_io->header_buf_idx);
sqe->flags |= IOSQE_FIXED_FILE;
int rc = co_await io.complete(sqe);
if(rc<=0)
{
std::cerr << "Error reading fuse_in_header after short read res: " << rc << std::endl;
co_return -1;
}
init_read+=rc;
} while(init_read<sizeof(fuse_in_header));
}
if(init_read<0 || init_read<sizeof(fuse_in_header))
{
std::cerr << "Error reading fuse_in_header res: " << init_read << std::endl;
co_return -1;
}
fuse_in_header* fheader = reinterpret_cast<fuse_in_header*>(fuse_io->header_buf);
DBG_PRINT(std::cout << "## fheader opcode: "<< fheader->opcode << " unique: "<< fheader->unique << " rbytes: " << rbytes << " init_read: " << init_read << std::endl);
size_t req_read_rbytes = 0;
bool req_read_add_zero=false;
bool req_allow_add_bytes=false;
switch(fheader->opcode)
{
case FUSE_GETATTR:
req_read_rbytes = sizeof(fuse_getattr_in);
break;
case FUSE_SETATTR:
req_read_rbytes = sizeof(fuse_setattr_in);
break;
case FUSE_OPENDIR:
req_read_rbytes = sizeof(fuse_open_in);
break;
case FUSE_READDIR:
req_read_rbytes = sizeof(fuse_read_in);
break;
case FUSE_RELEASEDIR:
req_read_rbytes = sizeof(fuse_release_in);
break;
case FUSE_LOOKUP:
req_read_rbytes = rbytes - sizeof(fuse_in_header);
req_read_add_zero=true;
break;
case FUSE_OPEN:
req_read_rbytes = sizeof(fuse_open_in);
break;
case FUSE_READ:
req_read_rbytes = sizeof(fuse_read_in);
break;
case FUSE_RELEASE:
req_read_rbytes = sizeof(fuse_release_in);
break;
case FUSE_WRITE:
req_read_rbytes = sizeof(fuse_write_in);
req_allow_add_bytes=true;
break;
default:
req_read_rbytes = rbytes - sizeof(fuse_in_header);
}
std::vector<char> rbytes_buf_d;
char* rbytes_buf;
if(req_read_rbytes>0)
{
if(!req_allow_add_bytes &&
req_read_rbytes!=rbytes - sizeof(fuse_in_header))
{
std::cerr << "Unexpected request size. Expected " <<
(rbytes - sizeof(fuse_in_header)) << " got " <<
req_read_rbytes << ". Opcode=" << fheader->opcode <<
" Unique=" << fheader->unique << std::endl;
co_return -1;
}
rbytes_buf = co_await read_rbytes(io, fuse_io, req_read_rbytes,
req_read_add_zero, init_read - sizeof(fuse_in_header), rbytes_buf_d);
if(rbytes_buf==nullptr)
{
std::cerr << "Reading rbytes failed." << std::endl;
co_return -1;
}
}
/*#undef DBG_PRINT
#define DBG_PRINT(x) x*/
int rc;
switch(fheader->opcode)
{
case FUSE_GETATTR:
DBG_PRINT(std::cout << "FUSE_GETATTR" << std::endl);
rc = co_await handle_getattr(io, fuse_io, rbytes_buf);
break;
case FUSE_SETATTR:
DBG_PRINT(std::cout << "FUSE_SETATTR" << std::endl);
rc = co_await handle_setattr(io, fuse_io, rbytes_buf);
break;
case FUSE_OPENDIR:
DBG_PRINT(std::cout << "FUSE_OPENDIR" << std::endl);
rc = co_await handle_opendir(io, fuse_io, rbytes_buf);
break;
case FUSE_READDIR:
DBG_PRINT(std::cout << "FUSE_READDIR" << std::endl);
rc = co_await handle_readdir(io, fuse_io, rbytes_buf);
break;
case FUSE_RELEASEDIR:
DBG_PRINT(std::cout << "FUSE_RELEASEDIR" << std::endl);
rc = co_await handle_releasedir(io, fuse_io, rbytes_buf);
break;
case FUSE_LOOKUP:
DBG_PRINT(std::cout << "FUSE_LOOKUP" << std::endl);
rc = co_await handle_lookup(io, fuse_io, rbytes_buf);
break;
case FUSE_OPEN:
DBG_PRINT(std::cout << "FUSE_OPEN" << std::endl);
rc = co_await handle_open(io, fuse_io, rbytes_buf);
break;
case FUSE_READ:
DBG_PRINT(std::cout << "FUSE_READ" << std::endl);
rc = co_await handle_read(io, fuse_io, rbytes_buf);
break;
case FUSE_RELEASE:
DBG_PRINT(std::cout << "FUSE_RELEASE" << std::endl);
rc = co_await handle_release(io, fuse_io, rbytes_buf);
break;
case FUSE_WRITE:
DBG_PRINT(std::cout << "FUSE_WRITE" << std::endl);
rc = co_await handle_write(io, fuse_io, rbytes_buf);
break;
default:
DBG_PRINT(std::cout << "## Unhandled opcode: " << fheader->opcode << std::endl);
rc = co_await handle_unknown(io, fuse_io);
break;
}
/*#undef DBG_PRINT
#define DBG_PRINT(x)*/
DBG_PRINT(std::cout << "## handle fuse done" << std::endl);
co_return rc;
}
int clone_fuse_fd(int fuse_fd)
{
int session_fd = open("/dev/fuse", O_RDWR | O_CLOEXEC);
if(session_fd==-1)
{
perror("Error opening /dev/fuse -2.");
return -1;
}
int rc = ioctl(session_fd, FUSE_DEV_IOC_CLONE, &fuse_fd);
if(rc==-1)
{
perror("Error cloning fuse fd");
return -1;
}
return session_fd;
}
int fuseuring_main(int backing_fd, const std::string& mountpoint, int max_fuse_ios,
int max_background, int congestion_threshold, size_t n_threads)
{
umount(mountpoint.c_str());
struct stat stbuf;
int rc = stat(mountpoint.c_str(), &stbuf);
if(rc!=0)
{
perror(("Error stat() mountpoint \""+mountpoint+"\". ").c_str());
return 1;
}
int fuse_fd = open("/dev/fuse", O_RDWR | O_CLOEXEC);
if(fuse_fd==-1)
{
perror("Error opening /dev/fuse.");
return 2;
}
char rootmode[10];
snprintf(rootmode, sizeof(rootmode), "%o", stbuf.st_mode & S_IFMT);
std::string mount_opts = "fd="+std::to_string(fuse_fd)+",rootmode="+std::string(rootmode)+",user_id=0,group_id=0,default_permissions,allow_other";
rc = mount("tclouddrive", mountpoint.c_str(), "fuse", MS_NOSUID | MS_NODEV|MS_NOATIME|MS_NOEXEC, mount_opts.c_str());
if(rc!=0)
{
perror("Error mounting fuse file system.");
return 3;
}
std::vector<char> init_buf(8192);
rc = read(fuse_fd, init_buf.data(), init_buf.size());
if(rc<=0)
{
perror(("Err fuse init rc="+std::to_string(rc)).c_str());
return 4;
}
struct InitInMsg
{
fuse_in_header header;
fuse_init_in init_in;
};
InitInMsg* init_in = reinterpret_cast<struct InitInMsg*>(init_buf.data());
if(init_in->header.opcode != FUSE_INIT)
{
std::cerr << "Unexpected opcode during init" << std::endl;
return 5;
}
if(init_in->header.len!=sizeof(InitInMsg))
{
std::cerr << "Unexpected length during init" << std::endl;
return 5;
}
if(init_in->init_in.major<FUSE_KERNEL_VERSION)
{
std::cerr << "Unsupported fuse major version " << init_in->init_in.major << std::endl;
return 5;
}
struct InitOutMsg
{
fuse_out_header header;
fuse_init_out init_out;
};
InitOutMsg init_out;
init_out.header.error = 0;
init_out.header.len = sizeof(InitOutMsg);
init_out.header.unique = init_in->header.unique;
init_out.init_out.major = FUSE_KERNEL_VERSION;
init_out.init_out.minor =FUSE_KERNEL_MINOR_VERSION;
if(init_in->init_in.major>FUSE_KERNEL_VERSION)
{
if(write(fuse_fd, &init_out, sizeof(init_out))!=sizeof(init_out))
{
perror("Error writing ver reply");
return 6;
}
int rc = read(fuse_fd, init_buf.data(), init_buf.size());
if(rc<=0)
{
perror("Err fuse init 2");
return 7;
}
}
init_out.init_out.max_readahead = init_in->init_in.max_readahead;
if( !(init_in->init_in.flags & FUSE_ASYNC_READ)
|| !(init_in->init_in.flags & FUSE_PARALLEL_DIROPS)
|| !(init_in->init_in.flags & FUSE_AUTO_INVAL_DATA)
|| !(init_in->init_in.flags & FUSE_HANDLE_KILLPRIV)
|| !(init_in->init_in.flags & FUSE_ASYNC_DIO)
|| !(init_in->init_in.flags & FUSE_IOCTL_DIR)
|| !(init_in->init_in.flags & FUSE_ATOMIC_O_TRUNC)
|| !(init_in->init_in.flags & FUSE_SPLICE_READ)